Merge pull request #170 from shole/master
[dygraphs.git] / dygraph.js
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1/**
2 * @license
3 * Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
5 */
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6
7/**
8 * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
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9 * string. Dygraph can handle multiple series with or without error bars. The
10 * date/value ranges will be automatically set. Dygraph uses the
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11 * <canvas> tag, so it only works in FF1.5+.
12 * @author danvdk@gmail.com (Dan Vanderkam)
13
14 Usage:
15 <div id="graphdiv" style="width:800px; height:500px;"></div>
16 <script type="text/javascript">
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17 new Dygraph(document.getElementById("graphdiv"),
18 "datafile.csv", // CSV file with headers
19 { }); // options
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20 </script>
21
22 The CSV file is of the form
23
285a6bda 24 Date,SeriesA,SeriesB,SeriesC
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25 YYYYMMDD,A1,B1,C1
26 YYYYMMDD,A2,B2,C2
27
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28 If the 'errorBars' option is set in the constructor, the input should be of
29 the form
285a6bda 30 Date,SeriesA,SeriesB,...
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31 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
32 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
33
34 If the 'fractions' option is set, the input should be of the form:
35
285a6bda 36 Date,SeriesA,SeriesB,...
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37 YYYYMMDD,A1/B1,A2/B2,...
38 YYYYMMDD,A1/B1,A2/B2,...
39
40 And error bars will be calculated automatically using a binomial distribution.
41
727439b4 42 For further documentation and examples, see http://dygraphs.com/
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43
44 */
45
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46/*jshint globalstrict: true */
47/*global DygraphRangeSelector:false, DygraphLayout:false, DygraphCanvasRenderer:false, G_vmlCanvasManager:false */
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48"use strict";
49
6a1aa64f 50/**
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51 * Creates an interactive, zoomable chart.
52 *
53 * @constructor
54 * @param {div | String} div A div or the id of a div into which to construct
55 * the chart.
56 * @param {String | Function} file A file containing CSV data or a function
57 * that returns this data. The most basic expected format for each line is
58 * "YYYY/MM/DD,val1,val2,...". For more information, see
59 * http://dygraphs.com/data.html.
6a1aa64f 60 * @param {Object} attrs Various other attributes, e.g. errorBars determines
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61 * whether the input data contains error ranges. For a complete list of
62 * options, see http://dygraphs.com/options.html.
6a1aa64f 63 */
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64var Dygraph = function(div, data, opts, opt_fourth_param) {
65 if (opt_fourth_param !== undefined) {
66 // Old versions of dygraphs took in the series labels as a constructor
67 // parameter. This doesn't make sense anymore, but it's easy to continue
68 // to support this usage.
69 this.warn("Using deprecated four-argument dygraph constructor");
70 this.__old_init__(div, data, opts, opt_fourth_param);
71 } else {
72 this.__init__(div, data, opts);
285a6bda 73 }
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74};
75
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76Dygraph.NAME = "Dygraph";
77Dygraph.VERSION = "1.2";
78Dygraph.__repr__ = function() {
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79 return "[" + this.NAME + " " + this.VERSION + "]";
80};
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81
82/**
83 * Returns information about the Dygraph class.
84 */
285a6bda 85Dygraph.toString = function() {
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86 return this.__repr__();
87};
88
89// Various default values
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90Dygraph.DEFAULT_ROLL_PERIOD = 1;
91Dygraph.DEFAULT_WIDTH = 480;
92Dygraph.DEFAULT_HEIGHT = 320;
6a1aa64f 93
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94Dygraph.ANIMATION_STEPS = 10;
95Dygraph.ANIMATION_DURATION = 200;
96
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97// These are defined before DEFAULT_ATTRS so that it can refer to them.
98/**
99 * @private
100 * Return a string version of a number. This respects the digitsAfterDecimal
101 * and maxNumberWidth options.
102 * @param {Number} x The number to be formatted
103 * @param {Dygraph} opts An options view
104 * @param {String} name The name of the point's data series
105 * @param {Dygraph} g The dygraph object
106 */
107Dygraph.numberValueFormatter = function(x, opts, pt, g) {
108 var sigFigs = opts('sigFigs');
109
110 if (sigFigs !== null) {
111 // User has opted for a fixed number of significant figures.
112 return Dygraph.floatFormat(x, sigFigs);
113 }
114
115 var digits = opts('digitsAfterDecimal');
116 var maxNumberWidth = opts('maxNumberWidth');
117
118 // switch to scientific notation if we underflow or overflow fixed display.
119 if (x !== 0.0 &&
120 (Math.abs(x) >= Math.pow(10, maxNumberWidth) ||
121 Math.abs(x) < Math.pow(10, -digits))) {
122 return x.toExponential(digits);
123 } else {
124 return '' + Dygraph.round_(x, digits);
125 }
126};
127
128/**
129 * variant for use as an axisLabelFormatter.
130 * @private
131 */
132Dygraph.numberAxisLabelFormatter = function(x, granularity, opts, g) {
133 return Dygraph.numberValueFormatter(x, opts, g);
134};
135
136/**
137 * Convert a JS date (millis since epoch) to YYYY/MM/DD
138 * @param {Number} date The JavaScript date (ms since epoch)
139 * @return {String} A date of the form "YYYY/MM/DD"
140 * @private
141 */
142Dygraph.dateString_ = function(date) {
143 var zeropad = Dygraph.zeropad;
144 var d = new Date(date);
145
146 // Get the year:
147 var year = "" + d.getFullYear();
148 // Get a 0 padded month string
149 var month = zeropad(d.getMonth() + 1); //months are 0-offset, sigh
150 // Get a 0 padded day string
151 var day = zeropad(d.getDate());
152
153 var ret = "";
154 var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds();
155 if (frac) ret = " " + Dygraph.hmsString_(date);
156
157 return year + "/" + month + "/" + day + ret;
158};
159
160/**
161 * Convert a JS date to a string appropriate to display on an axis that
162 * is displaying values at the stated granularity.
163 * @param {Date} date The date to format
164 * @param {Number} granularity One of the Dygraph granularity constants
165 * @return {String} The formatted date
166 * @private
167 */
168Dygraph.dateAxisFormatter = function(date, granularity) {
169 if (granularity >= Dygraph.DECADAL) {
170 return date.strftime('%Y');
171 } else if (granularity >= Dygraph.MONTHLY) {
172 return date.strftime('%b %y');
173 } else {
174 var frac = date.getHours() * 3600 + date.getMinutes() * 60 + date.getSeconds() + date.getMilliseconds();
758a629f 175 if (frac === 0 || granularity >= Dygraph.DAILY) {
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176 return new Date(date.getTime() + 3600*1000).strftime('%d%b');
177 } else {
178 return Dygraph.hmsString_(date.getTime());
179 }
180 }
181};
182
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183/**
184 * Standard plotters. These may be used by clients.
185 * Available plotters are:
186 * - Dygraph.Plotters.linePlotter: draws central lines (most common)
187 * - Dygraph.Plotters.errorPlotter: draws error bars
188 * - Dygraph.Plotters.fillPlotter: draws fills under lines (used with fillGraph)
189 *
190 * By default, the plotter is [fillPlotter, errorPlotter, linePlotter].
191 * This causes all the lines to be drawn over all the fills/error bars.
192 */
193Dygraph.Plotters = DygraphCanvasRenderer._Plotters;
194
48e614ac 195
8e4a6af3 196// Default attribute values.
285a6bda 197Dygraph.DEFAULT_ATTRS = {
a9fc39ab 198 highlightCircleSize: 3,
857a6931 199 highlightSeriesOpts: null,
afdb20d8 200 highlightSeriesBackgroundAlpha: 0.5,
285a6bda 201
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202 labelsDivWidth: 250,
203 labelsDivStyles: {
204 // TODO(danvk): move defaults from createStatusMessage_ here.
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205 },
206 labelsSeparateLines: false,
bcd3ebf0 207 labelsShowZeroValues: true,
285a6bda 208 labelsKMB: false,
afefbcdb 209 labelsKMG2: false,
d160cc3b 210 showLabelsOnHighlight: true,
12e4c741 211
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212 digitsAfterDecimal: 2,
213 maxNumberWidth: 6,
19589a3e 214 sigFigs: null,
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215
216 strokeWidth: 1.0,
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217 strokeBorderWidth: 0,
218 strokeBorderColor: "white",
8e4a6af3 219
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220 axisTickSize: 3,
221 axisLabelFontSize: 14,
222 xAxisLabelWidth: 50,
223 yAxisLabelWidth: 50,
224 rightGap: 5,
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225
226 showRoller: false,
285a6bda 227 xValueParser: Dygraph.dateParser,
285a6bda 228
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229 delimiter: ',',
230
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231 sigma: 2.0,
232 errorBars: false,
233 fractions: false,
234 wilsonInterval: true, // only relevant if fractions is true
5954ef32 235 customBars: false,
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236 fillGraph: false,
237 fillAlpha: 0.15,
f032c51d 238 connectSeparatedPoints: false,
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239
240 stackedGraph: false,
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241 hideOverlayOnMouseOut: true,
242
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243 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
244 legend: 'onmouseover', // the only relevant value at the moment is 'always'.
245
00c281d4 246 stepPlot: false,
062ef401 247 avoidMinZero: false,
f4b87da2 248 drawAxesAtZero: false,
062ef401 249
ad1798c2 250 // Sizes of the various chart labels.
b4202b3d 251 titleHeight: 28,
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252 xLabelHeight: 18,
253 yLabelWidth: 18,
ad1798c2 254
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255 drawXAxis: true,
256 drawYAxis: true,
257 axisLineColor: "black",
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258 axisLineWidth: 0.3,
259 gridLineWidth: 0.3,
260 axisLabelColor: "black",
261 axisLabelFont: "Arial", // TODO(danvk): is this implemented?
262 axisLabelWidth: 50,
263 drawYGrid: true,
264 drawXGrid: true,
265 gridLineColor: "rgb(128,128,128)",
423f5ed3 266
48e614ac 267 interactionModel: null, // will be set to Dygraph.Interaction.defaultModel
b1a3b195 268 animatedZooms: false, // (for now)
48e614ac 269
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270 // Range selector options
271 showRangeSelector: false,
272 rangeSelectorHeight: 40,
273 rangeSelectorPlotStrokeColor: "#808FAB",
274 rangeSelectorPlotFillColor: "#A7B1C4",
275
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276 // The ordering here ensures that central lines always appear above any
277 // fill bars/error bars.
278 plotter: [
279 Dygraph.Plotters.fillPlotter,
280 Dygraph.Plotters.errorPlotter,
281 Dygraph.Plotters.linePlotter
282 ],
283
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284 // per-axis options
285 axes: {
286 x: {
287 pixelsPerLabel: 60,
288 axisLabelFormatter: Dygraph.dateAxisFormatter,
289 valueFormatter: Dygraph.dateString_,
290 ticker: null // will be set in dygraph-tickers.js
291 },
292 y: {
293 pixelsPerLabel: 30,
294 valueFormatter: Dygraph.numberValueFormatter,
295 axisLabelFormatter: Dygraph.numberAxisLabelFormatter,
296 ticker: null // will be set in dygraph-tickers.js
297 },
298 y2: {
299 pixelsPerLabel: 30,
300 valueFormatter: Dygraph.numberValueFormatter,
301 axisLabelFormatter: Dygraph.numberAxisLabelFormatter,
302 ticker: null // will be set in dygraph-tickers.js
303 }
304 }
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305};
306
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307// Directions for panning and zooming. Use bit operations when combined
308// values are possible.
309Dygraph.HORIZONTAL = 1;
310Dygraph.VERTICAL = 2;
311
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312// Installed plugins, in order of precedence (most-general to most-specific).
313// Plugins are installed after they are defined, in plugins/install.js.
314Dygraph.PLUGINS = [
315];
316
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317// Used for initializing annotation CSS rules only once.
318Dygraph.addedAnnotationCSS = false;
319
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320Dygraph.prototype.__old_init__ = function(div, file, labels, attrs) {
321 // Labels is no longer a constructor parameter, since it's typically set
322 // directly from the data source. It also conains a name for the x-axis,
323 // which the previous constructor form did not.
758a629f 324 if (labels !== null) {
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325 var new_labels = ["Date"];
326 for (var i = 0; i < labels.length; i++) new_labels.push(labels[i]);
fc80a396 327 Dygraph.update(attrs, { 'labels': new_labels });
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328 }
329 this.__init__(div, file, attrs);
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330};
331
6a1aa64f 332/**
285a6bda 333 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
7aedf6fe 334 * and context &lt;canvas&gt; inside of it. See the constructor for details.
6a1aa64f 335 * on the parameters.
12e4c741 336 * @param {Element} div the Element to render the graph into.
6a1aa64f 337 * @param {String | Function} file Source data
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338 * @param {Object} attrs Miscellaneous other options
339 * @private
340 */
285a6bda 341Dygraph.prototype.__init__ = function(div, file, attrs) {
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342 // Hack for IE: if we're using excanvas and the document hasn't finished
343 // loading yet (and hence may not have initialized whatever it needs to
344 // initialize), then keep calling this routine periodically until it has.
345 if (/MSIE/.test(navigator.userAgent) && !window.opera &&
346 typeof(G_vmlCanvasManager) != 'undefined' &&
347 document.readyState != 'complete') {
348 var self = this;
758a629f 349 setTimeout(function() { self.__init__(div, file, attrs); }, 100);
ccd9d7c2 350 return;
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351 }
352
285a6bda 353 // Support two-argument constructor
758a629f 354 if (attrs === null || attrs === undefined) { attrs = {}; }
285a6bda 355
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356 attrs = Dygraph.mapLegacyOptions_(attrs);
357
358 if (!div) {
359 Dygraph.error("Constructing dygraph with a non-existent div!");
360 return;
361 }
362
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363 this.isUsingExcanvas_ = typeof(G_vmlCanvasManager) != 'undefined';
364
6a1aa64f 365 // Copy the important bits into the object
32988383 366 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
6a1aa64f 367 this.maindiv_ = div;
6a1aa64f 368 this.file_ = file;
285a6bda 369 this.rollPeriod_ = attrs.rollPeriod || Dygraph.DEFAULT_ROLL_PERIOD;
6a1aa64f 370 this.previousVerticalX_ = -1;
6a1aa64f 371 this.fractions_ = attrs.fractions || false;
6a1aa64f 372 this.dateWindow_ = attrs.dateWindow || null;
8b83c6cc 373
fe0b7c03 374 this.is_initial_draw_ = true;
5c528fa2 375 this.annotations_ = [];
7aedf6fe 376
45f2c689 377 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
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378 this.zoomed_x_ = false;
379 this.zoomed_y_ = false;
45f2c689 380
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381 // Clear the div. This ensure that, if multiple dygraphs are passed the same
382 // div, then only one will be drawn.
383 div.innerHTML = "";
384
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385 // For historical reasons, the 'width' and 'height' options trump all CSS
386 // rules _except_ for an explicit 'width' or 'height' on the div.
387 // As an added convenience, if the div has zero height (like <div></div> does
388 // without any styles), then we use a default height/width.
758a629f 389 if (div.style.width === '' && attrs.width) {
0cb9bd91 390 div.style.width = attrs.width + "px";
285a6bda 391 }
758a629f 392 if (div.style.height === '' && attrs.height) {
0cb9bd91 393 div.style.height = attrs.height + "px";
32988383 394 }
758a629f 395 if (div.style.height === '' && div.clientHeight === 0) {
0cb9bd91 396 div.style.height = Dygraph.DEFAULT_HEIGHT + "px";
758a629f 397 if (div.style.width === '') {
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398 div.style.width = Dygraph.DEFAULT_WIDTH + "px";
399 }
c21d2c2d 400 }
fffad740 401 // these will be zero if the dygraph's div is hidden.
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402 this.width_ = div.clientWidth;
403 this.height_ = div.clientHeight;
32988383 404
344ba8c0 405 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
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406 if (attrs.stackedGraph) {
407 attrs.fillGraph = true;
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408 // TODO(nikhilk): Add any other stackedGraph checks here.
409 }
410
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411 // These two options have a bad interaction. See issue 359.
412 if (attrs.showRangeSelector && attrs.animatedZooms) {
413 this.warn('You should not set animatedZooms=true when using the range selector.');
414 attrs.animatedZooms = false;
415 }
416
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417 // Dygraphs has many options, some of which interact with one another.
418 // To keep track of everything, we maintain two sets of options:
419 //
c21d2c2d 420 // this.user_attrs_ only options explicitly set by the user.
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421 // this.attrs_ defaults, options derived from user_attrs_, data.
422 //
423 // Options are then accessed this.attr_('attr'), which first looks at
424 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
425 // defaults without overriding behavior that the user specifically asks for.
426 this.user_attrs_ = {};
fc80a396 427 Dygraph.update(this.user_attrs_, attrs);
6a1aa64f 428
48e614ac 429 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
285a6bda 430 this.attrs_ = {};
48e614ac 431 Dygraph.updateDeep(this.attrs_, Dygraph.DEFAULT_ATTRS);
6a1aa64f 432
16269f6e 433 this.boundaryIds_ = [];
82c6fe4d 434 this.setIndexByName_ = {};
857a6931 435 this.datasetIndex_ = [];
6a1aa64f 436
6a4587ac 437 this.registeredEvents_ = [];
de8f284f 438 this.eventListeners_ = {};
6a4587ac 439
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440 // Create the containing DIV and other interactive elements
441 this.createInterface_();
442
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443 // Activate plugins.
444 this.plugins_ = [];
445 for (var i = 0; i < Dygraph.PLUGINS.length; i++) {
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446 var Plugin = Dygraph.PLUGINS[i];
447 var pluginInstance = new Plugin();
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448 var pluginDict = {
449 plugin: pluginInstance,
450 events: {},
451 options: {},
452 pluginOptions: {}
453 };
454
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455 var handlers = pluginInstance.activate(this);
456 for (var eventName in handlers) {
28aa77ac 457 // TODO(danvk): validate eventName.
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458 pluginDict.events[eventName] = handlers[eventName];
459 }
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460
461 this.plugins_.push(pluginDict);
462 }
463
464 // At this point, plugins can no longer register event handlers.
465 // Construct a map from event -> ordered list of [callback, plugin].
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466 for (var i = 0; i < this.plugins_.length; i++) {
467 var plugin_dict = this.plugins_[i];
468 for (var eventName in plugin_dict.events) {
469 if (!plugin_dict.events.hasOwnProperty(eventName)) continue;
470 var callback = plugin_dict.events[eventName];
471
472 var pair = [plugin_dict.plugin, callback];
473 if (!(eventName in this.eventListeners_)) {
474 this.eventListeners_[eventName] = [pair];
475 } else {
476 this.eventListeners_[eventName].push(pair);
477 }
478 }
479 }
480
738fc797 481 this.start_();
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482};
483
dcb25130 484/**
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485 * Triggers a cascade of events to the various plugins which are interested in them.
486 * Returns true if the "default behavior" should be performed, i.e. if none of
487 * the event listeners called event.preventDefault().
488 * @private
489 */
490Dygraph.prototype.cascadeEvents_ = function(name, extra_props) {
42a9ebb8 491 if (!(name in this.eventListeners_)) return true;
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492
493 // QUESTION: can we use objects & prototypes to speed this up?
494 var e = {
495 dygraph: this,
496 cancelable: false,
497 defaultPrevented: false,
498 preventDefault: function() {
499 if (!e.cancelable) throw "Cannot call preventDefault on non-cancelable event.";
500 e.defaultPrevented = true;
501 },
502 propagationStopped: false,
503 stopPropagation: function() {
5bd29cf4 504 e.propagationStopped = true;
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505 }
506 };
507 Dygraph.update(e, extra_props);
508
509 var callback_plugin_pairs = this.eventListeners_[name];
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510 if (callback_plugin_pairs) {
511 for (var i = callback_plugin_pairs.length - 1; i >= 0; i--) {
512 var plugin = callback_plugin_pairs[i][0];
513 var callback = callback_plugin_pairs[i][1];
514 callback.call(plugin, e);
515 if (e.propagationStopped) break;
516 }
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517 }
518 return e.defaultPrevented;
519};
520
521/**
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522 * Returns the zoomed status of the chart for one or both axes.
523 *
524 * Axis is an optional parameter. Can be set to 'x' or 'y'.
525 *
526 * The zoomed status for an axis is set whenever a user zooms using the mouse
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527 * or when the dateWindow or valueRange are updated (unless the
528 * isZoomedIgnoreProgrammaticZoom option is also specified).
dcb25130 529 */
57baab03 530Dygraph.prototype.isZoomed = function(axis) {
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531 if (axis === null || axis === undefined) {
532 return this.zoomed_x_ || this.zoomed_y_;
533 }
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534 if (axis === 'x') return this.zoomed_x_;
535 if (axis === 'y') return this.zoomed_y_;
94ea5744 536 throw "axis parameter is [" + axis + "] must be null, 'x' or 'y'.";
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537};
538
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539/**
540 * Returns information about the Dygraph object, including its containing ID.
541 */
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542Dygraph.prototype.toString = function() {
543 var maindiv = this.maindiv_;
758a629f 544 var id = (maindiv && maindiv.id) ? maindiv.id : maindiv;
22bd1dfb 545 return "[Dygraph " + id + "]";
758a629f 546};
22bd1dfb 547
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548/**
549 * @private
550 * Returns the value of an option. This may be set by the user (either in the
551 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
552 * per-series value.
553 * @param { String } name The name of the option, e.g. 'rollPeriod'.
554 * @param { String } [seriesName] The name of the series to which the option
555 * will be applied. If no per-series value of this option is available, then
556 * the global value is returned. This is optional.
557 * @return { ... } The value of the option.
558 */
227b93cc 559Dygraph.prototype.attr_ = function(name, seriesName) {
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560// <REMOVE_FOR_COMBINED>
561 if (typeof(Dygraph.OPTIONS_REFERENCE) === 'undefined') {
562 this.error('Must include options reference JS for testing');
563 } else if (!Dygraph.OPTIONS_REFERENCE.hasOwnProperty(name)) {
564 this.error('Dygraphs is using property ' + name + ', which has no entry ' +
565 'in the Dygraphs.OPTIONS_REFERENCE listing.');
566 // Only log this error once.
567 Dygraph.OPTIONS_REFERENCE[name] = true;
568 }
569// </REMOVE_FOR_COMBINED>
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570
571 var sources = [];
572 sources.push(this.attrs_);
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573 if (this.user_attrs_) {
574 sources.push(this.user_attrs_);
575 if (seriesName) {
576 if (this.user_attrs_.hasOwnProperty(seriesName)) {
577 sources.push(this.user_attrs_[seriesName]);
578 }
579 if (seriesName === this.highlightSet_ &&
580 this.user_attrs_.hasOwnProperty('highlightSeriesOpts')) {
42a9ebb8 581 sources.push(this.user_attrs_.highlightSeriesOpts);
475f7420 582 }
857a6931 583 }
285a6bda 584 }
857a6931
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585
586 var ret = null;
587 for (var i = sources.length - 1; i >= 0; --i) {
588 var source = sources[i];
589 if (source.hasOwnProperty(name)) {
590 ret = source[name];
591 break;
592 }
285a6bda 593 }
857a6931 594 return ret;
285a6bda
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595};
596
6a1aa64f 597/**
e2c21500
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598 * Returns the current value for an option, as set in the constructor or via
599 * updateOptions. You may pass in an (optional) series name to get per-series
600 * values for the option.
601 *
602 * All values returned by this method should be considered immutable. If you
603 * modify them, there is no guarantee that the changes will be honored or that
604 * dygraphs will remain in a consistent state. If you want to modify an option,
605 * use updateOptions() instead.
606 *
607 * @param { String } name The name of the option (e.g. 'strokeWidth')
608 * @param { String } [opt_seriesName] Series name to get per-series values.
609 * @return { ... } The value of the option.
610 */
611Dygraph.prototype.getOption = function(name, opt_seriesName) {
612 return this.attr_(name, opt_seriesName);
613};
614
615/**
48e614ac
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616 * @private
617 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
618 * @return { ... } A function mapping string -> option value
619 */
620Dygraph.prototype.optionsViewForAxis_ = function(axis) {
621 var self = this;
622 return function(opt) {
758a629f 623 var axis_opts = self.user_attrs_.axes;
48e614ac
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624 if (axis_opts && axis_opts[axis] && axis_opts[axis][opt]) {
625 return axis_opts[axis][opt];
626 }
627 // user-specified attributes always trump defaults, even if they're less
628 // specific.
629 if (typeof(self.user_attrs_[opt]) != 'undefined') {
630 return self.user_attrs_[opt];
631 }
632
758a629f 633 axis_opts = self.attrs_.axes;
48e614ac
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634 if (axis_opts && axis_opts[axis] && axis_opts[axis][opt]) {
635 return axis_opts[axis][opt];
636 }
637 // check old-style axis options
638 // TODO(danvk): add a deprecation warning if either of these match.
639 if (axis == 'y' && self.axes_[0].hasOwnProperty(opt)) {
640 return self.axes_[0][opt];
641 } else if (axis == 'y2' && self.axes_[1].hasOwnProperty(opt)) {
642 return self.axes_[1][opt];
643 }
644 return self.attr_(opt);
645 };
646};
647
648/**
6a1aa64f 649 * Returns the current rolling period, as set by the user or an option.
6faebb69 650 * @return {Number} The number of points in the rolling window
6a1aa64f 651 */
285a6bda 652Dygraph.prototype.rollPeriod = function() {
6a1aa64f 653 return this.rollPeriod_;
76171648
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654};
655
599fb4ad
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656/**
657 * Returns the currently-visible x-range. This can be affected by zooming,
658 * panning or a call to updateOptions.
659 * Returns a two-element array: [left, right].
660 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
661 */
662Dygraph.prototype.xAxisRange = function() {
4cac8c7a
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663 return this.dateWindow_ ? this.dateWindow_ : this.xAxisExtremes();
664};
599fb4ad 665
4cac8c7a
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666/**
667 * Returns the lower- and upper-bound x-axis values of the
668 * data set.
669 */
670Dygraph.prototype.xAxisExtremes = function() {
599fb4ad
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671 var left = this.rawData_[0][0];
672 var right = this.rawData_[this.rawData_.length - 1][0];
673 return [left, right];
674};
675
3230c662 676/**
d58ae307
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677 * Returns the currently-visible y-range for an axis. This can be affected by
678 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
679 * called with no arguments, returns the range of the first axis.
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680 * Returns a two-element array: [bottom, top].
681 */
d58ae307 682Dygraph.prototype.yAxisRange = function(idx) {
d63e6799 683 if (typeof(idx) == "undefined") idx = 0;
d64b8fea
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684 if (idx < 0 || idx >= this.axes_.length) {
685 return null;
686 }
687 var axis = this.axes_[idx];
688 return [ axis.computedValueRange[0], axis.computedValueRange[1] ];
d58ae307
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689};
690
691/**
692 * Returns the currently-visible y-ranges for each axis. This can be affected by
693 * zooming, panning, calls to updateOptions, etc.
694 * Returns an array of [bottom, top] pairs, one for each y-axis.
695 */
696Dygraph.prototype.yAxisRanges = function() {
697 var ret = [];
698 for (var i = 0; i < this.axes_.length; i++) {
699 ret.push(this.yAxisRange(i));
700 }
701 return ret;
3230c662
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702};
703
d58ae307 704// TODO(danvk): use these functions throughout dygraphs.
3230c662
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705/**
706 * Convert from data coordinates to canvas/div X/Y coordinates.
d58ae307
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707 * If specified, do this conversion for the coordinate system of a particular
708 * axis. Uses the first axis by default.
3230c662 709 * Returns a two-element array: [X, Y]
ff022deb 710 *
0747928a 711 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
ff022deb 712 * instead of toDomCoords(null, y, axis).
3230c662 713 */
d58ae307 714Dygraph.prototype.toDomCoords = function(x, y, axis) {
ff022deb
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715 return [ this.toDomXCoord(x), this.toDomYCoord(y, axis) ];
716};
717
718/**
719 * Convert from data x coordinates to canvas/div X coordinate.
720 * If specified, do this conversion for the coordinate system of a particular
0037b2a4
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721 * axis.
722 * Returns a single value or null if x is null.
ff022deb
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723 */
724Dygraph.prototype.toDomXCoord = function(x) {
758a629f 725 if (x === null) {
ff022deb 726 return null;
758a629f 727 }
ff022deb 728
3230c662 729 var area = this.plotter_.area;
ff022deb
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730 var xRange = this.xAxisRange();
731 return area.x + (x - xRange[0]) / (xRange[1] - xRange[0]) * area.w;
758a629f 732};
3230c662 733
ff022deb
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734/**
735 * Convert from data x coordinates to canvas/div Y coordinate and optional
736 * axis. Uses the first axis by default.
737 *
738 * returns a single value or null if y is null.
739 */
740Dygraph.prototype.toDomYCoord = function(y, axis) {
0747928a 741 var pct = this.toPercentYCoord(y, axis);
3230c662 742
758a629f 743 if (pct === null) {
ff022deb
RK
744 return null;
745 }
e4416fb9 746 var area = this.plotter_.area;
ff022deb 747 return area.y + pct * area.h;
758a629f 748};
3230c662
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749
750/**
751 * Convert from canvas/div coords to data coordinates.
d58ae307
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752 * If specified, do this conversion for the coordinate system of a particular
753 * axis. Uses the first axis by default.
ff022deb
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754 * Returns a two-element array: [X, Y].
755 *
0747928a 756 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
ff022deb 757 * instead of toDataCoords(null, y, axis).
3230c662 758 */
d58ae307 759Dygraph.prototype.toDataCoords = function(x, y, axis) {
ff022deb
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760 return [ this.toDataXCoord(x), this.toDataYCoord(y, axis) ];
761};
762
763/**
764 * Convert from canvas/div x coordinate to data coordinate.
765 *
766 * If x is null, this returns null.
767 */
768Dygraph.prototype.toDataXCoord = function(x) {
758a629f 769 if (x === null) {
ff022deb 770 return null;
3230c662
DV
771 }
772
ff022deb
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773 var area = this.plotter_.area;
774 var xRange = this.xAxisRange();
775 return xRange[0] + (x - area.x) / area.w * (xRange[1] - xRange[0]);
776};
777
778/**
779 * Convert from canvas/div y coord to value.
780 *
781 * If y is null, this returns null.
782 * if axis is null, this uses the first axis.
783 */
784Dygraph.prototype.toDataYCoord = function(y, axis) {
758a629f 785 if (y === null) {
ff022deb 786 return null;
3230c662
DV
787 }
788
ff022deb
RK
789 var area = this.plotter_.area;
790 var yRange = this.yAxisRange(axis);
791
b70247dc
RK
792 if (typeof(axis) == "undefined") axis = 0;
793 if (!this.axes_[axis].logscale) {
d9816e62 794 return yRange[0] + (area.y + area.h - y) / area.h * (yRange[1] - yRange[0]);
ff022deb
RK
795 } else {
796 // Computing the inverse of toDomCoord.
758a629f 797 var pct = (y - area.y) / area.h;
ff022deb
RK
798
799 // Computing the inverse of toPercentYCoord. The function was arrived at with
800 // the following steps:
801 //
802 // Original calcuation:
d59b6f34 803 // pct = (logr1 - Dygraph.log10(y)) / (logr1 - Dygraph.log10(yRange[0]));
ff022deb
RK
804 //
805 // Move denominator to both sides:
d59b6f34 806 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
ff022deb
RK
807 //
808 // subtract logr1, and take the negative value.
d59b6f34 809 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
ff022deb
RK
810 //
811 // Swap both sides of the equation, and we can compute the log of the
812 // return value. Which means we just need to use that as the exponent in
813 // e^exponent.
d59b6f34 814 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
ff022deb 815
d59b6f34
RK
816 var logr1 = Dygraph.log10(yRange[1]);
817 var exponent = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
818 var value = Math.pow(Dygraph.LOG_SCALE, exponent);
ff022deb
RK
819 return value;
820 }
3230c662
DV
821};
822
e99fde05 823/**
ff022deb 824 * Converts a y for an axis to a percentage from the top to the
4cac8c7a 825 * bottom of the drawing area.
ff022deb
RK
826 *
827 * If the coordinate represents a value visible on the canvas, then
828 * the value will be between 0 and 1, where 0 is the top of the canvas.
829 * However, this method will return values outside the range, as
830 * values can fall outside the canvas.
831 *
832 * If y is null, this returns null.
833 * if axis is null, this uses the first axis.
629a09ae
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834 *
835 * @param { Number } y The data y-coordinate.
836 * @param { Number } [axis] The axis number on which the data coordinate lives.
837 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
ff022deb
RK
838 */
839Dygraph.prototype.toPercentYCoord = function(y, axis) {
758a629f 840 if (y === null) {
ff022deb
RK
841 return null;
842 }
7d0e7a0d 843 if (typeof(axis) == "undefined") axis = 0;
ff022deb 844
ff022deb
RK
845 var yRange = this.yAxisRange(axis);
846
847 var pct;
7d0e7a0d 848 if (!this.axes_[axis].logscale) {
4cac8c7a
RK
849 // yRange[1] - y is unit distance from the bottom.
850 // yRange[1] - yRange[0] is the scale of the range.
ff022deb
RK
851 // (yRange[1] - y) / (yRange[1] - yRange[0]) is the % from the bottom.
852 pct = (yRange[1] - y) / (yRange[1] - yRange[0]);
853 } else {
d59b6f34
RK
854 var logr1 = Dygraph.log10(yRange[1]);
855 pct = (logr1 - Dygraph.log10(y)) / (logr1 - Dygraph.log10(yRange[0]));
ff022deb
RK
856 }
857 return pct;
758a629f 858};
ff022deb
RK
859
860/**
4cac8c7a
RK
861 * Converts an x value to a percentage from the left to the right of
862 * the drawing area.
863 *
864 * If the coordinate represents a value visible on the canvas, then
865 * the value will be between 0 and 1, where 0 is the left of the canvas.
866 * However, this method will return values outside the range, as
867 * values can fall outside the canvas.
868 *
869 * If x is null, this returns null.
629a09ae
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870 * @param { Number } x The data x-coordinate.
871 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
4cac8c7a
RK
872 */
873Dygraph.prototype.toPercentXCoord = function(x) {
758a629f 874 if (x === null) {
4cac8c7a
RK
875 return null;
876 }
877
4cac8c7a 878 var xRange = this.xAxisRange();
965a030e 879 return (x - xRange[0]) / (xRange[1] - xRange[0]);
629a09ae 880};
4cac8c7a
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881
882/**
e99fde05 883 * Returns the number of columns (including the independent variable).
629a09ae 884 * @return { Integer } The number of columns.
e99fde05
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885 */
886Dygraph.prototype.numColumns = function() {
395e98a3 887 return this.rawData_[0] ? this.rawData_[0].length : this.attr_("labels").length;
e99fde05
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888};
889
890/**
891 * Returns the number of rows (excluding any header/label row).
629a09ae 892 * @return { Integer } The number of rows, less any header.
e99fde05
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893 */
894Dygraph.prototype.numRows = function() {
895 return this.rawData_.length;
896};
897
898/**
395e98a3
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899 * Returns the full range of the x-axis, as determined by the most extreme
900 * values in the data set. Not affected by zooming, visibility, etc.
769e8bc7 901 * TODO(danvk): merge w/ xAxisExtremes
395e98a3
DV
902 * @return { Array<Number> } A [low, high] pair
903 * @private
904 */
905Dygraph.prototype.fullXRange_ = function() {
906 if (this.numRows() > 0) {
907 return [this.rawData_[0][0], this.rawData_[this.numRows() - 1][0]];
908 } else {
909 return [0, 1];
910 }
758a629f 911};
395e98a3
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912
913/**
e99fde05
DV
914 * Returns the value in the given row and column. If the row and column exceed
915 * the bounds on the data, returns null. Also returns null if the value is
916 * missing.
629a09ae
DV
917 * @param { Number} row The row number of the data (0-based). Row 0 is the
918 * first row of data, not a header row.
919 * @param { Number} col The column number of the data (0-based)
920 * @return { Number } The value in the specified cell or null if the row/col
921 * were out of range.
e99fde05
DV
922 */
923Dygraph.prototype.getValue = function(row, col) {
924 if (row < 0 || row > this.rawData_.length) return null;
925 if (col < 0 || col > this.rawData_[row].length) return null;
926
927 return this.rawData_[row][col];
928};
929
629a09ae 930/**
285a6bda 931 * Generates interface elements for the Dygraph: a containing div, a div to
6a1aa64f 932 * display the current point, and a textbox to adjust the rolling average
697e70b2 933 * period. Also creates the Renderer/Layout elements.
6a1aa64f
DV
934 * @private
935 */
285a6bda 936Dygraph.prototype.createInterface_ = function() {
6a1aa64f
DV
937 // Create the all-enclosing graph div
938 var enclosing = this.maindiv_;
939
b0c3b730
DV
940 this.graphDiv = document.createElement("div");
941 this.graphDiv.style.width = this.width_ + "px";
942 this.graphDiv.style.height = this.height_ + "px";
943 enclosing.appendChild(this.graphDiv);
944
945 // Create the canvas for interactive parts of the chart.
f8cfec73 946 this.canvas_ = Dygraph.createCanvas();
b0c3b730
DV
947 this.canvas_.style.position = "absolute";
948 this.canvas_.width = this.width_;
949 this.canvas_.height = this.height_;
f8cfec73
DV
950 this.canvas_.style.width = this.width_ + "px"; // for IE
951 this.canvas_.style.height = this.height_ + "px"; // for IE
b0c3b730 952
2cf95fff
RK
953 this.canvas_ctx_ = Dygraph.getContext(this.canvas_);
954
b0c3b730 955 // ... and for static parts of the chart.
6a1aa64f 956 this.hidden_ = this.createPlotKitCanvas_(this.canvas_);
2cf95fff 957 this.hidden_ctx_ = Dygraph.getContext(this.hidden_);
76171648 958
ccd9d7c2
PF
959 if (this.attr_('showRangeSelector')) {
960 // The range selector must be created here so that its canvases and contexts get created here.
961 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
ccd9d7c2
PF
962 this.rangeSelector_ = new DygraphRangeSelector(this);
963 }
964
eb7bf005
EC
965 // The interactive parts of the graph are drawn on top of the chart.
966 this.graphDiv.appendChild(this.hidden_);
967 this.graphDiv.appendChild(this.canvas_);
920208fb
PF
968 this.mouseEventElement_ = this.createMouseEventElement_();
969
970 // Create the grapher
971 this.layout_ = new DygraphLayout(this);
972
973 if (this.rangeSelector_) {
974 // This needs to happen after the graph canvases are added to the div and the layout object is created.
975 this.rangeSelector_.addToGraph(this.graphDiv, this.layout_);
976 }
eb7bf005 977
76171648 978 var dygraph = this;
de8f284f 979
d7eddd78 980 this.mouseMoveHandler = function(e) {
421f1773 981 dygraph.mouseMove_(e);
d7eddd78 982 };
6a4587ac 983 this.addEvent(this.mouseEventElement_, 'mousemove', this.mouseMoveHandler);
de8f284f 984
d7eddd78 985 this.mouseOutHandler = function(e) {
421f1773 986 dygraph.mouseOut_(e);
d7eddd78 987 };
6a4587ac 988 this.addEvent(this.mouseEventElement_, 'mouseout', this.mouseOutHandler);
697e70b2 989
697e70b2 990 this.createDragInterface_();
4b4d1a63 991
1c6b239c 992 this.resizeHandler = function(e) {
993 dygraph.resize();
d7eddd78 994 };
1c6b239c 995
4b4d1a63
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996 // Update when the window is resized.
997 // TODO(danvk): drop frames depending on complexity of the chart.
6a4587ac 998 this.addEvent(window, 'resize', this.resizeHandler);
4cfcc38c
DV
999};
1000
1001/**
1002 * Detach DOM elements in the dygraph and null out all data references.
1003 * Calling this when you're done with a dygraph can dramatically reduce memory
1004 * usage. See, e.g., the tests/perf.html example.
1005 */
1006Dygraph.prototype.destroy = function() {
1007 var removeRecursive = function(node) {
1008 while (node.hasChildNodes()) {
1009 removeRecursive(node.firstChild);
1010 node.removeChild(node.firstChild);
1011 }
1012 };
de8f284f 1013
6a4587ac
RK
1014 for (var idx = 0; idx < this.registeredEvents_.length; idx++) {
1015 var reg = this.registeredEvents_[idx];
1cc3540b 1016 Dygraph.removeEvent(reg.elem, reg.type, reg.fn);
6a4587ac
RK
1017 }
1018 this.registeredEvents_ = [];
1019
1020 // remove mouse event handlers (This may not be necessary anymore)
1cc3540b
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1021 Dygraph.removeEvent(this.mouseEventElement_, 'mouseout', this.mouseOutHandler);
1022 Dygraph.removeEvent(this.mouseEventElement_, 'mousemove', this.mouseMoveHandler);
1023 Dygraph.removeEvent(this.mouseEventElement_, 'mousemove', this.mouseUpHandler_);
4cfcc38c
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1024 removeRecursive(this.maindiv_);
1025
1026 var nullOut = function(obj) {
1027 for (var n in obj) {
1028 if (typeof(obj[n]) === 'object') {
1029 obj[n] = null;
1030 }
1031 }
1032 };
1c6b239c 1033 // remove event handlers
1cc3540b 1034 Dygraph.removeEvent(window,'resize',this.resizeHandler);
1c6b239c 1035 this.resizeHandler = null;
4cfcc38c
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1036 // These may not all be necessary, but it can't hurt...
1037 nullOut(this.layout_);
1038 nullOut(this.plotter_);
1039 nullOut(this);
1040};
6a1aa64f
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1041
1042/**
629a09ae
DV
1043 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1044 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1045 * or the zoom rectangles) is done on this.canvas_.
8846615a 1046 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
6a1aa64f
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1047 * @return {Object} The newly-created canvas
1048 * @private
1049 */
285a6bda 1050Dygraph.prototype.createPlotKitCanvas_ = function(canvas) {
f8cfec73 1051 var h = Dygraph.createCanvas();
6a1aa64f 1052 h.style.position = "absolute";
9ac5e4ae
DV
1053 // TODO(danvk): h should be offset from canvas. canvas needs to include
1054 // some extra area to make it easier to zoom in on the far left and far
1055 // right. h needs to be precisely the plot area, so that clipping occurs.
6a1aa64f
DV
1056 h.style.top = canvas.style.top;
1057 h.style.left = canvas.style.left;
1058 h.width = this.width_;
1059 h.height = this.height_;
f8cfec73
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1060 h.style.width = this.width_ + "px"; // for IE
1061 h.style.height = this.height_ + "px"; // for IE
6a1aa64f
DV
1062 return h;
1063};
1064
629a09ae 1065/**
920208fb
PF
1066 * Creates an overlay element used to handle mouse events.
1067 * @return {Object} The mouse event element.
1068 * @private
1069 */
1070Dygraph.prototype.createMouseEventElement_ = function() {
1071 if (this.isUsingExcanvas_) {
1072 var elem = document.createElement("div");
1073 elem.style.position = 'absolute';
1074 elem.style.backgroundColor = 'white';
1075 elem.style.filter = 'alpha(opacity=0)';
1076 elem.style.width = this.width_ + "px";
1077 elem.style.height = this.height_ + "px";
1078 this.graphDiv.appendChild(elem);
1079 return elem;
1080 } else {
1081 return this.canvas_;
1082 }
1083};
1084
1085/**
6a1aa64f
DV
1086 * Generate a set of distinct colors for the data series. This is done with a
1087 * color wheel. Saturation/Value are customizable, and the hue is
1088 * equally-spaced around the color wheel. If a custom set of colors is
1089 * specified, that is used instead.
6a1aa64f
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1090 * @private
1091 */
285a6bda 1092Dygraph.prototype.setColors_ = function() {
ee53deb9
DV
1093 var labels = this.getLabels();
1094 var num = labels.length - 1;
6a1aa64f 1095 this.colors_ = [];
ee53deb9 1096 this.colorsMap_ = {};
285a6bda 1097 var colors = this.attr_('colors');
758a629f 1098 var i;
285a6bda
DV
1099 if (!colors) {
1100 var sat = this.attr_('colorSaturation') || 1.0;
1101 var val = this.attr_('colorValue') || 0.5;
2aa21213 1102 var half = Math.ceil(num / 2);
758a629f 1103 for (i = 1; i <= num; i++) {
ec1959eb 1104 if (!this.visibility()[i-1]) continue;
43af96e7 1105 // alternate colors for high contrast.
2aa21213 1106 var idx = i % 2 ? Math.ceil(i / 2) : (half + i / 2);
43af96e7 1107 var hue = (1.0 * idx/ (1 + num));
ee53deb9
DV
1108 var colorStr = Dygraph.hsvToRGB(hue, sat, val);
1109 this.colors_.push(colorStr);
1110 this.colorsMap_[labels[i]] = colorStr;
6a1aa64f
DV
1111 }
1112 } else {
758a629f 1113 for (i = 0; i < num; i++) {
ec1959eb 1114 if (!this.visibility()[i]) continue;
285a6bda 1115 var colorStr = colors[i % colors.length];
f474c2a3 1116 this.colors_.push(colorStr);
ee53deb9 1117 this.colorsMap_[labels[1 + i]] = colorStr;
6a1aa64f
DV
1118 }
1119 }
629a09ae 1120};
6a1aa64f 1121
43af96e7
NK
1122/**
1123 * Return the list of colors. This is either the list of colors passed in the
629a09ae 1124 * attributes or the autogenerated list of rgb(r,g,b) strings.
e2c21500 1125 * This does not return colors for invisible series.
43af96e7
NK
1126 * @return {Array<string>} The list of colors.
1127 */
1128Dygraph.prototype.getColors = function() {
1129 return this.colors_;
1130};
1131
6a1aa64f 1132/**
e2c21500
DV
1133 * Returns a few attributes of a series, i.e. its color, its visibility, which
1134 * axis it's assigned to, and its column in the original data.
1135 * Returns null if the series does not exist.
1136 * Otherwise, returns an object with column, visibility, color and axis properties.
1137 * The "axis" property will be set to 1 for y1 and 2 for y2.
1138 * The "column" property can be fed back into getValue(row, column) to get
1139 * values for this series.
6a1aa64f 1140 */
e2c21500
DV
1141Dygraph.prototype.getPropertiesForSeries = function(series_name) {
1142 var idx = -1;
1143 var labels = this.getLabels();
1144 for (var i = 1; i < labels.length; i++) {
1145 if (labels[i] == series_name) {
1146 idx = i;
1147 break;
b0c3b730 1148 }
6a1aa64f 1149 }
e2c21500 1150 if (idx == -1) return null;
0abfbd7e 1151
e2c21500
DV
1152 return {
1153 name: series_name,
1154 column: idx,
1155 visible: this.visibility()[idx - 1],
189f8030 1156 color: this.colorsMap_[series_name],
e2c21500
DV
1157 axis: 1 + this.seriesToAxisMap_[series_name]
1158 };
0abfbd7e
DV
1159};
1160
1161/**
6a1aa64f 1162 * Create the text box to adjust the averaging period
6a1aa64f
DV
1163 * @private
1164 */
285a6bda 1165Dygraph.prototype.createRollInterface_ = function() {
8c69de65
DV
1166 // Create a roller if one doesn't exist already.
1167 if (!this.roller_) {
1168 this.roller_ = document.createElement("input");
1169 this.roller_.type = "text";
1170 this.roller_.style.display = "none";
1171 this.graphDiv.appendChild(this.roller_);
1172 }
1173
1174 var display = this.attr_('showRoller') ? 'block' : 'none';
26ca7938 1175
0c38f187 1176 var area = this.plotter_.area;
b0c3b730
DV
1177 var textAttr = { "position": "absolute",
1178 "zIndex": 10,
0c38f187
DV
1179 "top": (area.y + area.h - 25) + "px",
1180 "left": (area.x + 1) + "px",
b0c3b730 1181 "display": display
6a1aa64f 1182 };
8c69de65
DV
1183 this.roller_.size = "2";
1184 this.roller_.value = this.rollPeriod_;
b0c3b730 1185 for (var name in textAttr) {
85b99f0b 1186 if (textAttr.hasOwnProperty(name)) {
8c69de65 1187 this.roller_.style[name] = textAttr[name];
85b99f0b 1188 }
b0c3b730
DV
1189 }
1190
76171648 1191 var dygraph = this;
8c69de65 1192 this.roller_.onchange = function() { dygraph.adjustRoll(dygraph.roller_.value); };
76171648
DV
1193};
1194
629a09ae
DV
1195/**
1196 * @private
629a09ae
DV
1197 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1198 * canvas (i.e. DOM Coords).
1199 */
062ef401 1200Dygraph.prototype.dragGetX_ = function(e, context) {
758a629f 1201 return Dygraph.pageX(e) - context.px;
062ef401 1202};
bce01b0f 1203
629a09ae
DV
1204/**
1205 * @private
1206 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1207 * canvas (i.e. DOM Coords).
1208 */
062ef401 1209Dygraph.prototype.dragGetY_ = function(e, context) {
758a629f 1210 return Dygraph.pageY(e) - context.py;
062ef401 1211};
ee672584 1212
629a09ae 1213/**
062ef401
JB
1214 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1215 * events.
1216 * @private
1217 */
1218Dygraph.prototype.createDragInterface_ = function() {
1219 var context = {
1220 // Tracks whether the mouse is down right now
1221 isZooming: false,
1222 isPanning: false, // is this drag part of a pan?
1223 is2DPan: false, // if so, is that pan 1- or 2-dimensional?
8442269f
RK
1224 dragStartX: null, // pixel coordinates
1225 dragStartY: null, // pixel coordinates
1226 dragEndX: null, // pixel coordinates
1227 dragEndY: null, // pixel coordinates
062ef401 1228 dragDirection: null,
8442269f
RK
1229 prevEndX: null, // pixel coordinates
1230 prevEndY: null, // pixel coordinates
062ef401 1231 prevDragDirection: null,
421f1773 1232 cancelNextDblclick: false, // see comment in dygraph-interaction-model.js
062ef401 1233
ec291cbe
RK
1234 // The value on the left side of the graph when a pan operation starts.
1235 initialLeftmostDate: null,
1236
1237 // The number of units each pixel spans. (This won't be valid for log
1238 // scales)
1239 xUnitsPerPixel: null,
062ef401
JB
1240
1241 // TODO(danvk): update this comment
1242 // The range in second/value units that the viewport encompasses during a
1243 // panning operation.
1244 dateRange: null,
1245
8442269f
RK
1246 // Top-left corner of the canvas, in DOM coords
1247 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
062ef401
JB
1248 px: 0,
1249 py: 0,
1250
965a030e 1251 // Values for use with panEdgeFraction, which limit how far outside the
4cac8c7a
RK
1252 // graph's data boundaries it can be panned.
1253 boundedDates: null, // [minDate, maxDate]
1254 boundedValues: null, // [[minValue, maxValue] ...]
1255
2bad4d92
DV
1256 // We cover iframes during mouse interactions. See comments in
1257 // dygraph-utils.js for more info on why this is a good idea.
1258 tarp: new Dygraph.IFrameTarp(),
1259
6a4587ac
RK
1260 // contextB is the same thing as this context object but renamed.
1261 initializeMouseDown: function(event, g, contextB) {
062ef401
JB
1262 // prevents mouse drags from selecting page text.
1263 if (event.preventDefault) {
1264 event.preventDefault(); // Firefox, Chrome, etc.
6a1aa64f 1265 } else {
062ef401
JB
1266 event.returnValue = false; // IE
1267 event.cancelBubble = true;
6a1aa64f
DV
1268 }
1269
6a4587ac
RK
1270 contextB.px = Dygraph.findPosX(g.canvas_);
1271 contextB.py = Dygraph.findPosY(g.canvas_);
1272 contextB.dragStartX = g.dragGetX_(event, contextB);
1273 contextB.dragStartY = g.dragGetY_(event, contextB);
1274 contextB.cancelNextDblclick = false;
2bad4d92 1275 contextB.tarp.cover();
6a1aa64f 1276 }
062ef401 1277 };
2b188b3d 1278
062ef401 1279 var interactionModel = this.attr_("interactionModel");
8b83c6cc 1280
062ef401
JB
1281 // Self is the graph.
1282 var self = this;
6faebb69 1283
062ef401
JB
1284 // Function that binds the graph and context to the handler.
1285 var bindHandler = function(handler) {
1286 return function(event) {
1287 handler(event, self, context);
1288 };
1289 };
1290
1291 for (var eventName in interactionModel) {
1292 if (!interactionModel.hasOwnProperty(eventName)) continue;
6a4587ac 1293 this.addEvent(this.mouseEventElement_, eventName,
062ef401
JB
1294 bindHandler(interactionModel[eventName]));
1295 }
1296
1297 // If the user releases the mouse button during a drag, but not over the
1298 // canvas, then it doesn't count as a zooming action.
cb1261cb 1299 this.mouseUpHandler_ = function(event) {
062ef401
JB
1300 if (context.isZooming || context.isPanning) {
1301 context.isZooming = false;
1302 context.dragStartX = null;
1303 context.dragStartY = null;
1304 }
1305
1306 if (context.isPanning) {
1307 context.isPanning = false;
1308 context.draggingDate = null;
1309 context.dateRange = null;
1310 for (var i = 0; i < self.axes_.length; i++) {
1311 delete self.axes_[i].draggingValue;
1312 delete self.axes_[i].dragValueRange;
1313 }
1314 }
2bad4d92
DV
1315
1316 context.tarp.uncover();
cb1261cb
DV
1317 };
1318
bc3e2c5d 1319 this.addEvent(document, 'mouseup', this.mouseUpHandler_);
6a1aa64f
DV
1320};
1321
1322/**
1323 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1324 * up any previous zoom rectangles that were drawn. This could be optimized to
1325 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1326 * dots.
ccd9d7c2 1327 *
39b0e098
RK
1328 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1329 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
6a1aa64f
DV
1330 * @param {Number} startX The X position where the drag started, in canvas
1331 * coordinates.
1332 * @param {Number} endX The current X position of the drag, in canvas coords.
8b83c6cc
RK
1333 * @param {Number} startY The Y position where the drag started, in canvas
1334 * coordinates.
1335 * @param {Number} endY The current Y position of the drag, in canvas coords.
39b0e098 1336 * @param {Number} prevDirection the value of direction on the previous call to
8b83c6cc 1337 * this function. Used to avoid excess redrawing
6a1aa64f
DV
1338 * @param {Number} prevEndX The value of endX on the previous call to this
1339 * function. Used to avoid excess redrawing
8b83c6cc
RK
1340 * @param {Number} prevEndY The value of endY on the previous call to this
1341 * function. Used to avoid excess redrawing
6a1aa64f
DV
1342 * @private
1343 */
7201b11e
JB
1344Dygraph.prototype.drawZoomRect_ = function(direction, startX, endX, startY,
1345 endY, prevDirection, prevEndX,
1346 prevEndY) {
2cf95fff 1347 var ctx = this.canvas_ctx_;
6a1aa64f
DV
1348
1349 // Clean up from the previous rect if necessary
39b0e098 1350 if (prevDirection == Dygraph.HORIZONTAL) {
fa54c193
FXB
1351 ctx.clearRect(Math.min(startX, prevEndX), this.layout_.getPlotArea().y,
1352 Math.abs(startX - prevEndX), this.layout_.getPlotArea().h);
39b0e098 1353 } else if (prevDirection == Dygraph.VERTICAL){
fa54c193
FXB
1354 ctx.clearRect(this.layout_.getPlotArea().x, Math.min(startY, prevEndY),
1355 this.layout_.getPlotArea().w, Math.abs(startY - prevEndY));
6a1aa64f
DV
1356 }
1357
1358 // Draw a light-grey rectangle to show the new viewing area
39b0e098 1359 if (direction == Dygraph.HORIZONTAL) {
8b83c6cc
RK
1360 if (endX && startX) {
1361 ctx.fillStyle = "rgba(128,128,128,0.33)";
fa54c193
FXB
1362 ctx.fillRect(Math.min(startX, endX), this.layout_.getPlotArea().y,
1363 Math.abs(endX - startX), this.layout_.getPlotArea().h);
8b83c6cc 1364 }
920208fb 1365 } else if (direction == Dygraph.VERTICAL) {
8b83c6cc
RK
1366 if (endY && startY) {
1367 ctx.fillStyle = "rgba(128,128,128,0.33)";
fa54c193
FXB
1368 ctx.fillRect(this.layout_.getPlotArea().x, Math.min(startY, endY),
1369 this.layout_.getPlotArea().w, Math.abs(endY - startY));
8b83c6cc 1370 }
6a1aa64f 1371 }
920208fb
PF
1372
1373 if (this.isUsingExcanvas_) {
1374 this.currentZoomRectArgs_ = [direction, startX, endX, startY, endY, 0, 0, 0];
1375 }
1376};
1377
1378/**
1379 * Clear the zoom rectangle (and perform no zoom).
1380 * @private
1381 */
1382Dygraph.prototype.clearZoomRect_ = function() {
1383 this.currentZoomRectArgs_ = null;
1384 this.canvas_ctx_.clearRect(0, 0, this.canvas_.width, this.canvas_.height);
6a1aa64f
DV
1385};
1386
1387/**
8b83c6cc
RK
1388 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1389 * the canvas. The exact zoom window may be slightly larger if there are no data
1390 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1391 * which accepts dates that match the raw data. This function redraws the graph.
d58ae307 1392 *
6a1aa64f
DV
1393 * @param {Number} lowX The leftmost pixel value that should be visible.
1394 * @param {Number} highX The rightmost pixel value that should be visible.
1395 * @private
1396 */
8b83c6cc 1397Dygraph.prototype.doZoomX_ = function(lowX, highX) {
920208fb 1398 this.currentZoomRectArgs_ = null;
6a1aa64f 1399 // Find the earliest and latest dates contained in this canvasx range.
8b83c6cc 1400 // Convert the call to date ranges of the raw data.
ff022deb
RK
1401 var minDate = this.toDataXCoord(lowX);
1402 var maxDate = this.toDataXCoord(highX);
8b83c6cc
RK
1403 this.doZoomXDates_(minDate, maxDate);
1404};
6a1aa64f 1405
8b83c6cc 1406/**
b1a3b195
DV
1407 * Transition function to use in animations. Returns values between 0.0
1408 * (totally old values) and 1.0 (totally new values) for each frame.
1409 * @private
1410 */
1411Dygraph.zoomAnimationFunction = function(frame, numFrames) {
1412 var k = 1.5;
1413 return (1.0 - Math.pow(k, -frame)) / (1.0 - Math.pow(k, -numFrames));
1414};
1415
1416/**
8b83c6cc
RK
1417 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1418 * method with doZoomX which accepts pixel coordinates. This function redraws
1419 * the graph.
d58ae307 1420 *
8b83c6cc
RK
1421 * @param {Number} minDate The minimum date that should be visible.
1422 * @param {Number} maxDate The maximum date that should be visible.
1423 * @private
1424 */
1425Dygraph.prototype.doZoomXDates_ = function(minDate, maxDate) {
b1a3b195
DV
1426 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1427 // can produce strange effects. Rather than the y-axis transitioning slowly
1428 // between values, it can jerk around.)
1429 var old_window = this.xAxisRange();
1430 var new_window = [minDate, maxDate];
57baab03 1431 this.zoomed_x_ = true;
b1a3b195
DV
1432 var that = this;
1433 this.doAnimatedZoom(old_window, new_window, null, null, function() {
1434 if (that.attr_("zoomCallback")) {
1435 that.attr_("zoomCallback")(minDate, maxDate, that.yAxisRanges());
1436 }
1437 });
8b83c6cc
RK
1438};
1439
1440/**
1441 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
d58ae307
DV
1442 * the canvas. This function redraws the graph.
1443 *
8b83c6cc
RK
1444 * @param {Number} lowY The topmost pixel value that should be visible.
1445 * @param {Number} highY The lowest pixel value that should be visible.
1446 * @private
1447 */
1448Dygraph.prototype.doZoomY_ = function(lowY, highY) {
920208fb 1449 this.currentZoomRectArgs_ = null;
d58ae307
DV
1450 // Find the highest and lowest values in pixel range for each axis.
1451 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1452 // This is because pixels increase as you go down on the screen, whereas data
1453 // coordinates increase as you go up the screen.
b1a3b195
DV
1454 var oldValueRanges = this.yAxisRanges();
1455 var newValueRanges = [];
d58ae307 1456 for (var i = 0; i < this.axes_.length; i++) {
ff022deb
RK
1457 var hi = this.toDataYCoord(lowY, i);
1458 var low = this.toDataYCoord(highY, i);
b1a3b195 1459 newValueRanges.push([low, hi]);
d58ae307 1460 }
8b83c6cc 1461
57baab03 1462 this.zoomed_y_ = true;
b1a3b195
DV
1463 var that = this;
1464 this.doAnimatedZoom(null, null, oldValueRanges, newValueRanges, function() {
1465 if (that.attr_("zoomCallback")) {
1466 var xRange = that.xAxisRange();
b1a3b195
DV
1467 that.attr_("zoomCallback")(xRange[0], xRange[1], that.yAxisRanges());
1468 }
1469 });
8b83c6cc
RK
1470};
1471
1472/**
1473 * Reset the zoom to the original view coordinates. This is the same as
1474 * double-clicking on the graph.
d58ae307 1475 *
8b83c6cc
RK
1476 * @private
1477 */
1478Dygraph.prototype.doUnzoom_ = function() {
b1a3b195 1479 var dirty = false, dirtyX = false, dirtyY = false;
758a629f 1480 if (this.dateWindow_ !== null) {
d58ae307 1481 dirty = true;
b1a3b195 1482 dirtyX = true;
8b83c6cc 1483 }
d58ae307
DV
1484
1485 for (var i = 0; i < this.axes_.length; i++) {
1f6a6254 1486 if (typeof(this.axes_[i].valueWindow) !== 'undefined' && this.axes_[i].valueWindow !== null) {
d58ae307 1487 dirty = true;
b1a3b195 1488 dirtyY = true;
d58ae307 1489 }
8b83c6cc
RK
1490 }
1491
da1369a5
DV
1492 // Clear any selection, since it's likely to be drawn in the wrong place.
1493 this.clearSelection();
1494
8b83c6cc 1495 if (dirty) {
57baab03
NN
1496 this.zoomed_x_ = false;
1497 this.zoomed_y_ = false;
b1a3b195
DV
1498
1499 var minDate = this.rawData_[0][0];
1500 var maxDate = this.rawData_[this.rawData_.length - 1][0];
1501
1502 // With only one frame, don't bother calculating extreme ranges.
1503 // TODO(danvk): merge this block w/ the code below.
1504 if (!this.attr_("animatedZooms")) {
1505 this.dateWindow_ = null;
758a629f
DV
1506 for (i = 0; i < this.axes_.length; i++) {
1507 if (this.axes_[i].valueWindow !== null) {
b1a3b195
DV
1508 delete this.axes_[i].valueWindow;
1509 }
1510 }
1511 this.drawGraph_();
1512 if (this.attr_("zoomCallback")) {
1513 this.attr_("zoomCallback")(minDate, maxDate, this.yAxisRanges());
1514 }
1515 return;
1516 }
1517
1518 var oldWindow=null, newWindow=null, oldValueRanges=null, newValueRanges=null;
1519 if (dirtyX) {
1520 oldWindow = this.xAxisRange();
1521 newWindow = [minDate, maxDate];
1522 }
1523
1524 if (dirtyY) {
1525 oldValueRanges = this.yAxisRanges();
1526 // TODO(danvk): this is pretty inefficient
1527 var packed = this.gatherDatasets_(this.rolledSeries_, null);
1528 var extremes = packed[1];
1529
1530 // this has the side-effect of modifying this.axes_.
1531 // this doesn't make much sense in this context, but it's convenient (we
1532 // need this.axes_[*].extremeValues) and not harmful since we'll be
1533 // calling drawGraph_ shortly, which clobbers these values.
1534 this.computeYAxisRanges_(extremes);
1535
1536 newValueRanges = [];
758a629f 1537 for (i = 0; i < this.axes_.length; i++) {
1f6a6254 1538 var axis = this.axes_[i];
681a215e
DV
1539 newValueRanges.push((axis.valueRange !== null &&
1540 axis.valueRange !== undefined) ?
42a9ebb8 1541 axis.valueRange : axis.extremeRange);
b1a3b195
DV
1542 }
1543 }
1544
1545 var that = this;
1546 this.doAnimatedZoom(oldWindow, newWindow, oldValueRanges, newValueRanges,
1547 function() {
1548 that.dateWindow_ = null;
1549 for (var i = 0; i < that.axes_.length; i++) {
758a629f 1550 if (that.axes_[i].valueWindow !== null) {
b1a3b195
DV
1551 delete that.axes_[i].valueWindow;
1552 }
1553 }
1554 if (that.attr_("zoomCallback")) {
1555 that.attr_("zoomCallback")(minDate, maxDate, that.yAxisRanges());
1556 }
1557 });
1558 }
1559};
1560
1561/**
1562 * Combined animation logic for all zoom functions.
1563 * either the x parameters or y parameters may be null.
1564 * @private
1565 */
1566Dygraph.prototype.doAnimatedZoom = function(oldXRange, newXRange, oldYRanges, newYRanges, callback) {
1567 var steps = this.attr_("animatedZooms") ? Dygraph.ANIMATION_STEPS : 1;
1568
1569 var windows = [];
1570 var valueRanges = [];
758a629f 1571 var step, frac;
b1a3b195 1572
758a629f
DV
1573 if (oldXRange !== null && newXRange !== null) {
1574 for (step = 1; step <= steps; step++) {
1575 frac = Dygraph.zoomAnimationFunction(step, steps);
b1a3b195
DV
1576 windows[step-1] = [oldXRange[0]*(1-frac) + frac*newXRange[0],
1577 oldXRange[1]*(1-frac) + frac*newXRange[1]];
8b83c6cc 1578 }
67e650dc 1579 }
b1a3b195 1580
758a629f
DV
1581 if (oldYRanges !== null && newYRanges !== null) {
1582 for (step = 1; step <= steps; step++) {
1583 frac = Dygraph.zoomAnimationFunction(step, steps);
b1a3b195
DV
1584 var thisRange = [];
1585 for (var j = 0; j < this.axes_.length; j++) {
1586 thisRange.push([oldYRanges[j][0]*(1-frac) + frac*newYRanges[j][0],
1587 oldYRanges[j][1]*(1-frac) + frac*newYRanges[j][1]]);
1588 }
1589 valueRanges[step-1] = thisRange;
1590 }
1591 }
1592
1593 var that = this;
1594 Dygraph.repeatAndCleanup(function(step) {
1595 if (valueRanges.length) {
1596 for (var i = 0; i < that.axes_.length; i++) {
1597 var w = valueRanges[step][i];
1598 that.axes_[i].valueWindow = [w[0], w[1]];
1599 }
1600 }
1601 if (windows.length) {
1602 that.dateWindow_ = windows[step];
1603 }
1604 that.drawGraph_();
1605 }, steps, Dygraph.ANIMATION_DURATION / steps, callback);
6a1aa64f
DV
1606};
1607
1608/**
857a6931
KW
1609 * Get the current graph's area object.
1610 *
1611 * Returns: {x, y, w, h}
6a1aa64f 1612 */
857a6931
KW
1613Dygraph.prototype.getArea = function() {
1614 return this.plotter_.area;
1615};
e863a17d 1616
857a6931
KW
1617/**
1618 * Convert a mouse event to DOM coordinates relative to the graph origin.
1619 *
1620 * Returns a two-element array: [X, Y].
1621 */
1622Dygraph.prototype.eventToDomCoords = function(event) {
4cac8c7a 1623 var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(this.mouseEventElement_);
857a6931
KW
1624 var canvasy = Dygraph.pageY(event) - Dygraph.findPosY(this.mouseEventElement_);
1625 return [canvasx, canvasy];
1626};
4cac8c7a 1627
857a6931
KW
1628/**
1629 * Given a canvas X coordinate, find the closest row.
1630 * @param {Number} domX graph-relative DOM X coordinate
1631 * Returns: row number, integer
1632 * @private
1633 */
1634Dygraph.prototype.findClosestRow = function(domX) {
81cb07d6 1635 var minDistX = Infinity;
a12a78ae
DV
1636 var pointIdx = -1, setIdx = -1;
1637 var sets = this.layout_.points;
1638 for (var i = 0; i < sets.length; i++) {
1639 var points = sets[i];
1640 var len = points.length;
1641 for (var j = 0; j < len; j++) {
1642 var point = points[j];
1643 if (!Dygraph.isValidPoint(point, true)) continue;
1644 var dist = Math.abs(point.canvasx - domX);
1645 if (dist < minDistX) {
1646 minDistX = dist;
1647 setIdx = i;
1648 pointIdx = j;
1649 }
a937d031 1650 }
6a1aa64f 1651 }
a12a78ae
DV
1652
1653 // TODO(danvk): remove this function; it's trivial and has only one use.
1654 return this.idxToRow_(setIdx, pointIdx);
857a6931 1655};
6a1aa64f 1656
857a6931 1657/**
2a02e5dd
KW
1658 * Given canvas X,Y coordinates, find the closest point.
1659 *
1660 * This finds the individual data point across all visible series
1661 * that's closest to the supplied DOM coordinates using the standard
1662 * Euclidean X,Y distance.
1663 *
857a6931
KW
1664 * @param {Number} domX graph-relative DOM X coordinate
1665 * @param {Number} domY graph-relative DOM Y coordinate
1666 * Returns: {row, seriesName, point}
1667 * @private
1668 */
1669Dygraph.prototype.findClosestPoint = function(domX, domY) {
81cb07d6 1670 var minDist = Infinity;
857a6931 1671 var idx = -1;
857a6931 1672 var dist, dx, dy, point, closestPoint, closestSeries;
cc825c7b 1673 for ( var setIdx = this.layout_.datasets.length - 1 ; setIdx >= 0 ; --setIdx ) {
a12a78ae
DV
1674 var points = this.layout_.points[setIdx];
1675 for (var i = 0; i < points.length; ++i) {
1676 var point = points[i];
62c3d2fd 1677 if (!Dygraph.isValidPoint(point)) continue;
857a6931
KW
1678 dx = point.canvasx - domX;
1679 dy = point.canvasy - domY;
1680 dist = dx * dx + dy * dy;
81cb07d6 1681 if (dist < minDist) {
62c3d2fd 1682 minDist = dist;
a937d031
KW
1683 closestPoint = point;
1684 closestSeries = setIdx;
1685 idx = i;
1686 }
857a6931
KW
1687 }
1688 }
1689 var name = this.layout_.setNames[closestSeries];
1690 return {
81cb07d6 1691 row: idx + this.getLeftBoundary_(),
857a6931
KW
1692 seriesName: name,
1693 point: closestPoint
1694 };
1695};
1696
1697/**
1698 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
2a02e5dd
KW
1699 *
1700 * This first finds the X data point closest to the supplied DOM X coordinate,
1701 * then finds the series which puts the Y coordinate on top of its filled area,
1702 * using linear interpolation between adjacent point pairs.
1703 *
857a6931
KW
1704 * @param {Number} domX graph-relative DOM X coordinate
1705 * @param {Number} domY graph-relative DOM Y coordinate
1706 * Returns: {row, seriesName, point}
1707 * @private
1708 */
1709Dygraph.prototype.findStackedPoint = function(domX, domY) {
1710 var row = this.findClosestRow(domX);
81cb07d6
KW
1711 var boundary = this.getLeftBoundary_();
1712 var rowIdx = row - boundary;
a12a78ae 1713 var sets = this.layout_.points;
857a6931
KW
1714 var closestPoint, closestSeries;
1715 for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
a12a78ae
DV
1716 var points = this.layout_.points[setIdx];
1717 if (rowIdx >= points.length) continue;
1718 var p1 = points[rowIdx];
62c3d2fd 1719 if (!Dygraph.isValidPoint(p1)) continue;
857a6931 1720 var py = p1.canvasy;
a12a78ae 1721 if (domX > p1.canvasx && rowIdx + 1 < points.length) {
857a6931 1722 // interpolate series Y value using next point
a12a78ae 1723 var p2 = points[rowIdx + 1];
62c3d2fd
KW
1724 if (Dygraph.isValidPoint(p2)) {
1725 var dx = p2.canvasx - p1.canvasx;
1726 if (dx > 0) {
1727 var r = (domX - p1.canvasx) / dx;
1728 py += r * (p2.canvasy - p1.canvasy);
1729 }
416b05ad 1730 }
81cb07d6 1731 } else if (domX < p1.canvasx && rowIdx > 0) {
857a6931 1732 // interpolate series Y value using previous point
a12a78ae 1733 var p0 = points[rowIdx - 1];
62c3d2fd
KW
1734 if (Dygraph.isValidPoint(p0)) {
1735 var dx = p1.canvasx - p0.canvasx;
1736 if (dx > 0) {
1737 var r = (p1.canvasx - domX) / dx;
1738 py += r * (p0.canvasy - p1.canvasy);
1739 }
12e4c741 1740 }
6a1aa64f 1741 }
857a6931 1742 // Stop if the point (domX, py) is above this series' upper edge
42a9ebb8 1743 if (setIdx === 0 || py < domY) {
a937d031
KW
1744 closestPoint = p1;
1745 closestSeries = setIdx;
1746 }
6a1aa64f 1747 }
857a6931
KW
1748 var name = this.layout_.setNames[closestSeries];
1749 return {
1750 row: row,
1751 seriesName: name,
1752 point: closestPoint
1753 };
1754};
6a1aa64f 1755
857a6931 1756/**
6a1aa64f
DV
1757 * When the mouse moves in the canvas, display information about a nearby data
1758 * point and draw dots over those points in the data series. This function
1759 * takes care of cleanup of previously-drawn dots.
1760 * @param {Object} event The mousemove event from the browser.
1761 * @private
1762 */
285a6bda 1763Dygraph.prototype.mouseMove_ = function(event) {
e863a17d 1764 // This prevents JS errors when mousing over the canvas before data loads.
4cac8c7a 1765 var points = this.layout_.points;
a12a78ae 1766 if (points === undefined || points === null) return;
e863a17d 1767
857a6931
KW
1768 var canvasCoords = this.eventToDomCoords(event);
1769 var canvasx = canvasCoords[0];
1770 var canvasy = canvasCoords[1];
6a1aa64f 1771
857a6931
KW
1772 var highlightSeriesOpts = this.attr_("highlightSeriesOpts");
1773 var selectionChanged = false;
b9a3ece4 1774 if (highlightSeriesOpts && !this.lockedSet_) {
857a6931
KW
1775 var closest;
1776 if (this.attr_("stackedGraph")) {
1777 closest = this.findStackedPoint(canvasx, canvasy);
1778 } else {
1779 closest = this.findClosestPoint(canvasx, canvasy);
43af96e7 1780 }
857a6931 1781 selectionChanged = this.setSelection(closest.row, closest.seriesName);
416b05ad 1782 } else {
857a6931
KW
1783 var idx = this.findClosestRow(canvasx);
1784 selectionChanged = this.setSelection(idx);
12e4c741 1785 }
43af96e7 1786
857a6931
KW
1787 var callback = this.attr_("highlightCallback");
1788 if (callback && selectionChanged) {
1789 callback(event, this.lastx_, this.selPoints_, this.lastRow_, this.highlightSet_);
12e4c741 1790 }
239c712d 1791};
b258a3da 1792
239c712d 1793/**
81cb07d6 1794 * Fetch left offset from first defined boundaryIds record (see bug #236).
e2c21500 1795 * @private
81cb07d6
KW
1796 */
1797Dygraph.prototype.getLeftBoundary_ = function() {
1798 for (var i = 0; i < this.boundaryIds_.length; i++) {
1799 if (this.boundaryIds_[i] !== undefined) {
1800 return this.boundaryIds_[i][0];
1801 }
1802 }
1803 return 0;
1804};
1805
1806/**
1903f1e4 1807 * Transforms layout_.points index into data row number.
2ddb1197 1808 * @param int layout_.points index
1903f1e4 1809 * @return int row number, or -1 if none could be found.
2ddb1197
SC
1810 * @private
1811 */
a12a78ae
DV
1812Dygraph.prototype.idxToRow_ = function(setIdx, rowIdx) {
1813 if (rowIdx < 0) return -1;
2ddb1197 1814
81cb07d6 1815 var boundary = this.getLeftBoundary_();
a12a78ae
DV
1816 return boundary + rowIdx;
1817 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1818 // var set = this.layout_.datasets[setIdx];
1819 // if (idx < set.length) {
1820 // return boundary + idx;
1821 // }
1822 // idx -= set.length;
1823 // }
1824 // return -1;
1903f1e4 1825};
2ddb1197 1826
857a6931
KW
1827Dygraph.prototype.animateSelection_ = function(direction) {
1828 var totalSteps = 10;
1829 var millis = 30;
1d44ee5e
KW
1830 if (this.fadeLevel === undefined) this.fadeLevel = 0;
1831 if (this.animateId === undefined) this.animateId = 0;
857a6931
KW
1832 var start = this.fadeLevel;
1833 var steps = direction < 0 ? start : totalSteps - start;
1834 if (steps <= 0) {
1835 if (this.fadeLevel) {
1836 this.updateSelection_(1.0);
1837 }
1838 return;
1839 }
1840
1841 var thisId = ++this.animateId;
1842 var that = this;
475f7420
KW
1843 Dygraph.repeatAndCleanup(
1844 function(n) {
1845 // ignore simultaneous animations
1846 if (that.animateId != thisId) return;
1847
1848 that.fadeLevel += direction;
1849 if (that.fadeLevel === 0) {
1850 that.clearSelection();
1851 } else {
1852 that.updateSelection_(that.fadeLevel / totalSteps);
1853 }
1854 },
1855 steps, millis, function() {});
857a6931
KW
1856};
1857
2ddb1197 1858/**
239c712d
NAG
1859 * Draw dots over the selectied points in the data series. This function
1860 * takes care of cleanup of previously-drawn dots.
1861 * @private
1862 */
857a6931 1863Dygraph.prototype.updateSelection_ = function(opt_animFraction) {
e2c21500
DV
1864 var defaultPrevented = this.cascadeEvents_('select', {
1865 selectedX: this.lastx_,
1866 selectedPoints: this.selPoints_
1867 });
1868 // TODO(danvk): use defaultPrevented here?
1869
6a1aa64f 1870 // Clear the previously drawn vertical, if there is one
758a629f 1871 var i;
2cf95fff 1872 var ctx = this.canvas_ctx_;
857a6931
KW
1873 if (this.attr_('highlightSeriesOpts')) {
1874 ctx.clearRect(0, 0, this.width_, this.height_);
afdb20d8 1875 var alpha = 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
857a6931 1876 if (alpha) {
2a02e5dd
KW
1877 // Activating background fade includes an animation effect for a gradual
1878 // fade. TODO(klausw): make this independently configurable if it causes
1879 // issues? Use a shared preference to control animations?
1880 var animateBackgroundFade = true;
1881 if (animateBackgroundFade) {
857a6931
KW
1882 if (opt_animFraction === undefined) {
1883 // start a new animation
1884 this.animateSelection_(1);
1885 return;
1886 }
1887 alpha *= opt_animFraction;
1888 }
1889 ctx.fillStyle = 'rgba(255,255,255,' + alpha + ')';
1890 ctx.fillRect(0, 0, this.width_, this.height_);
1891 }
38e3d209
DV
1892
1893 // Redraw only the highlighted series in the interactive canvas (not the
1894 // static plot canvas, which is where series are usually drawn).
1895 this.plotter_._renderLineChart(this.highlightSet_, ctx);
857a6931 1896 } else if (this.previousVerticalX_ >= 0) {
46dde5f9
DV
1897 // Determine the maximum highlight circle size.
1898 var maxCircleSize = 0;
227b93cc 1899 var labels = this.attr_('labels');
758a629f 1900 for (i = 1; i < labels.length; i++) {
227b93cc 1901 var r = this.attr_('highlightCircleSize', labels[i]);
46dde5f9
DV
1902 if (r > maxCircleSize) maxCircleSize = r;
1903 }
6a1aa64f 1904 var px = this.previousVerticalX_;
46dde5f9
DV
1905 ctx.clearRect(px - maxCircleSize - 1, 0,
1906 2 * maxCircleSize + 2, this.height_);
6a1aa64f
DV
1907 }
1908
920208fb
PF
1909 if (this.isUsingExcanvas_ && this.currentZoomRectArgs_) {
1910 Dygraph.prototype.drawZoomRect_.apply(this, this.currentZoomRectArgs_);
1911 }
1912
d160cc3b 1913 if (this.selPoints_.length > 0) {
6a1aa64f 1914 // Draw colored circles over the center of each selected point
e9fe4a2f 1915 var canvasx = this.selPoints_[0].canvasx;
43af96e7 1916 ctx.save();
758a629f 1917 for (i = 0; i < this.selPoints_.length; i++) {
e9fe4a2f
DV
1918 var pt = this.selPoints_[i];
1919 if (!Dygraph.isOK(pt.canvasy)) continue;
1920
1921 var circleSize = this.attr_('highlightCircleSize', pt.name);
5879307d 1922 var callback = this.attr_("drawHighlightPointCallback", pt.name);
a8ef67a8 1923 var color = this.plotter_.colors[pt.name];
78e58af4
RK
1924 if (!callback) {
1925 callback = Dygraph.Circles.DEFAULT;
1926 }
a8ef67a8
KW
1927 ctx.lineWidth = this.attr_('strokeWidth', pt.name);
1928 ctx.strokeStyle = color;
1929 ctx.fillStyle = color;
78e58af4 1930 callback(this.g, pt.name, ctx, canvasx, pt.canvasy,
a8ef67a8 1931 color, circleSize);
6a1aa64f
DV
1932 }
1933 ctx.restore();
1934
1935 this.previousVerticalX_ = canvasx;
1936 }
1937};
1938
1939/**
629a09ae
DV
1940 * Manually set the selected points and display information about them in the
1941 * legend. The selection can be cleared using clearSelection() and queried
1942 * using getSelection().
1943 * @param { Integer } row number that should be highlighted (i.e. appear with
1944 * hover dots on the chart). Set to false to clear any selection.
857a6931
KW
1945 * @param { seriesName } optional series name to highlight that series with the
1946 * the highlightSeriesOpts setting.
b9a3ece4
KW
1947 * @param { locked } optional If true, keep seriesName selected when mousing
1948 * over the graph, disabling closest-series highlighting. Call clearSelection()
1949 * to unlock it.
239c712d 1950 */
b9a3ece4 1951Dygraph.prototype.setSelection = function(row, opt_seriesName, opt_locked) {
239c712d
NAG
1952 // Extract the points we've selected
1953 this.selPoints_ = [];
50360fd0 1954
239c712d 1955 if (row !== false) {
81cb07d6 1956 row -= this.getLeftBoundary_();
16269f6e 1957 }
50360fd0 1958
857a6931 1959 var changed = false;
16269f6e 1960 if (row !== false && row >= 0) {
857a6931
KW
1961 if (row != this.lastRow_) changed = true;
1962 this.lastRow_ = row;
82c6fe4d
KW
1963 for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1964 var set = this.layout_.datasets[setIdx];
1965 if (row < set.length) {
a12a78ae 1966 var point = this.layout_.points[setIdx][row];
ccd9d7c2 1967
38f33a44 1968 if (this.attr_("stackedGraph")) {
a12a78ae 1969 point = this.layout_.unstackPointAtIndex(setIdx, row);
38f33a44 1970 }
ccd9d7c2 1971
42a9ebb8 1972 if (point.yval !== null) this.selPoints_.push(point);
16269f6e 1973 }
239c712d 1974 }
857a6931
KW
1975 } else {
1976 if (this.lastRow_ >= 0) changed = true;
1977 this.lastRow_ = -1;
16269f6e 1978 }
50360fd0 1979
16269f6e 1980 if (this.selPoints_.length) {
239c712d 1981 this.lastx_ = this.selPoints_[0].xval;
239c712d 1982 } else {
857a6931 1983 this.lastx_ = -1;
239c712d
NAG
1984 }
1985
857a6931
KW
1986 if (opt_seriesName !== undefined) {
1987 if (this.highlightSet_ !== opt_seriesName) changed = true;
1988 this.highlightSet_ = opt_seriesName;
239c712d
NAG
1989 }
1990
b9a3ece4
KW
1991 if (opt_locked !== undefined) {
1992 this.lockedSet_ = opt_locked;
1993 }
1994
857a6931
KW
1995 if (changed) {
1996 this.updateSelection_(undefined);
1997 }
1998 return changed;
239c712d
NAG
1999};
2000
2001/**
6a1aa64f
DV
2002 * The mouse has left the canvas. Clear out whatever artifacts remain
2003 * @param {Object} event the mouseout event from the browser.
2004 * @private
2005 */
285a6bda 2006Dygraph.prototype.mouseOut_ = function(event) {
a4c6a67c
AV
2007 if (this.attr_("unhighlightCallback")) {
2008 this.attr_("unhighlightCallback")(event);
2009 }
2010
b9a3ece4 2011 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_) {
239c712d 2012 this.clearSelection();
43af96e7 2013 }
6a1aa64f
DV
2014};
2015
239c712d 2016/**
629a09ae
DV
2017 * Clears the current selection (i.e. points that were highlighted by moving
2018 * the mouse over the chart).
239c712d
NAG
2019 */
2020Dygraph.prototype.clearSelection = function() {
e2c21500
DV
2021 this.cascadeEvents_('deselect', {});
2022
b9a3ece4 2023 this.lockedSet_ = false;
239c712d 2024 // Get rid of the overlay data
857a6931
KW
2025 if (this.fadeLevel) {
2026 this.animateSelection_(-1);
2027 return;
2028 }
2cf95fff 2029 this.canvas_ctx_.clearRect(0, 0, this.width_, this.height_);
857a6931 2030 this.fadeLevel = 0;
239c712d
NAG
2031 this.selPoints_ = [];
2032 this.lastx_ = -1;
857a6931
KW
2033 this.lastRow_ = -1;
2034 this.highlightSet_ = null;
758a629f 2035};
239c712d 2036
103b7292 2037/**
629a09ae
DV
2038 * Returns the number of the currently selected row. To get data for this row,
2039 * you can use the getValue method.
2040 * @return { Integer } row number, or -1 if nothing is selected
103b7292
NAG
2041 */
2042Dygraph.prototype.getSelection = function() {
2043 if (!this.selPoints_ || this.selPoints_.length < 1) {
2044 return -1;
2045 }
50360fd0 2046
a12a78ae
DV
2047 for (var setIdx = 0; setIdx < this.layout_.points.length; setIdx++) {
2048 var points = this.layout_.points[setIdx];
2049 for (var row = 0; row < points.length; row++) {
2050 if (points[row].x == this.selPoints_[0].x) {
2051 return row + this.getLeftBoundary_();
2052 }
103b7292
NAG
2053 }
2054 }
2055 return -1;
2e1fcf1a 2056};
103b7292 2057
e2c21500
DV
2058/**
2059 * Returns the name of the currently-highlighted series.
2060 * Only available when the highlightSeriesOpts option is in use.
2061 */
857a6931
KW
2062Dygraph.prototype.getHighlightSeries = function() {
2063 return this.highlightSet_;
2064};
2065
19589a3e 2066/**
6a1aa64f
DV
2067 * Fires when there's data available to be graphed.
2068 * @param {String} data Raw CSV data to be plotted
2069 * @private
2070 */
285a6bda 2071Dygraph.prototype.loadedEvent_ = function(data) {
6a1aa64f 2072 this.rawData_ = this.parseCSV_(data);
26ca7938 2073 this.predraw_();
6a1aa64f
DV
2074};
2075
6a1aa64f
DV
2076/**
2077 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2078 * @private
2079 */
285a6bda 2080Dygraph.prototype.addXTicks_ = function() {
6a1aa64f 2081 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
7201b11e 2082 var range;
6a1aa64f 2083 if (this.dateWindow_) {
7201b11e 2084 range = [this.dateWindow_[0], this.dateWindow_[1]];
6a1aa64f 2085 } else {
395e98a3 2086 range = this.fullXRange_();
7201b11e
JB
2087 }
2088
48e614ac
DV
2089 var xAxisOptionsView = this.optionsViewForAxis_('x');
2090 var xTicks = xAxisOptionsView('ticker')(
2091 range[0],
2092 range[1],
2093 this.width_, // TODO(danvk): should be area.width
2094 xAxisOptionsView,
2095 this);
2096 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2097 // console.log(msg);
b2c9222a 2098 this.layout_.setXTicks(xTicks);
32988383
DV
2099};
2100
629a09ae
DV
2101/**
2102 * @private
2103 * Computes the range of the data series (including confidence intervals).
2104 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2105 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2106 * @return [low, high]
2107 */
5011e7a1 2108Dygraph.prototype.extremeValues_ = function(series) {
758a629f 2109 var minY = null, maxY = null, j, y;
5011e7a1 2110
9922b78b 2111 var bars = this.attr_("errorBars") || this.attr_("customBars");
5011e7a1
DV
2112 if (bars) {
2113 // With custom bars, maxY is the max of the high values.
758a629f
DV
2114 for (j = 0; j < series.length; j++) {
2115 y = series[j][1][0];
44477387 2116 if (y === null || isNaN(y)) continue;
5011e7a1
DV
2117 var low = y - series[j][1][1];
2118 var high = y + series[j][1][2];
2119 if (low > y) low = y; // this can happen with custom bars,
2120 if (high < y) high = y; // e.g. in tests/custom-bars.html
758a629f 2121 if (maxY === null || high > maxY) {
5011e7a1
DV
2122 maxY = high;
2123 }
758a629f 2124 if (minY === null || low < minY) {
5011e7a1
DV
2125 minY = low;
2126 }
2127 }
2128 } else {
758a629f
DV
2129 for (j = 0; j < series.length; j++) {
2130 y = series[j][1];
d12999d3 2131 if (y === null || isNaN(y)) continue;
758a629f 2132 if (maxY === null || y > maxY) {
5011e7a1
DV
2133 maxY = y;
2134 }
758a629f 2135 if (minY === null || y < minY) {
5011e7a1
DV
2136 minY = y;
2137 }
2138 }
2139 }
2140
2141 return [minY, maxY];
2142};
2143
6a1aa64f 2144/**
629a09ae 2145 * @private
26ca7938
DV
2146 * This function is called once when the chart's data is changed or the options
2147 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2148 * idea is that values derived from the chart's data can be computed here,
2149 * rather than every time the chart is drawn. This includes things like the
2150 * number of axes, rolling averages, etc.
2151 */
2152Dygraph.prototype.predraw_ = function() {
7153e001
DV
2153 var start = new Date();
2154
26ca7938
DV
2155 // TODO(danvk): move more computations out of drawGraph_ and into here.
2156 this.computeYAxes_();
2157
2158 // Create a new plotter.
f417e3d3 2159 if (this.plotter_) {
1748a51c 2160 this.cascadeEvents_('clearChart');
f417e3d3
DV
2161 this.plotter_.clear();
2162 }
26ca7938 2163 this.plotter_ = new DygraphCanvasRenderer(this,
2cf95fff
RK
2164 this.hidden_,
2165 this.hidden_ctx_,
0e23cfc6 2166 this.layout_);
26ca7938 2167
0abfbd7e
DV
2168 // The roller sits in the bottom left corner of the chart. We don't know where
2169 // this will be until the options are available, so it's positioned here.
8c69de65 2170 this.createRollInterface_();
26ca7938 2171
e2c21500 2172 this.cascadeEvents_('predraw');
0abfbd7e 2173
ccd9d7c2
PF
2174 if (this.rangeSelector_) {
2175 this.rangeSelector_.renderStaticLayer();
2176 }
2177
b1a3b195
DV
2178 // Convert the raw data (a 2D array) into the internal format and compute
2179 // rolling averages.
2180 this.rolledSeries_ = [null]; // x-axis is the first series and it's special
395e98a3 2181 for (var i = 1; i < this.numColumns(); i++) {
04c104d7
KW
2182 var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong
2183 var series = this.extractSeries_(this.rawData_, i, logScale);
b1a3b195
DV
2184 series = this.rollingAverage(series, this.rollPeriod_);
2185 this.rolledSeries_.push(series);
2186 }
2187
26ca7938
DV
2188 // If the data or options have changed, then we'd better redraw.
2189 this.drawGraph_();
4b4d1a63
DV
2190
2191 // This is used to determine whether to do various animations.
2192 var end = new Date();
2193 this.drawingTimeMs_ = (end - start);
26ca7938
DV
2194};
2195
2196/**
b1a3b195
DV
2197 * Loop over all fields and create datasets, calculating extreme y-values for
2198 * each series and extreme x-indices as we go.
fc4e84fa 2199 *
b1a3b195
DV
2200 * dateWindow is passed in as an explicit parameter so that we can compute
2201 * extreme values "speculatively", i.e. without actually setting state on the
2202 * dygraph.
fc4e84fa 2203 *
b1a3b195
DV
2204 * TODO(danvk): make this more of a true function
2205 * @return [ datasets, seriesExtremes, boundaryIds ]
6a1aa64f
DV
2206 * @private
2207 */
b1a3b195
DV
2208Dygraph.prototype.gatherDatasets_ = function(rolledSeries, dateWindow) {
2209 var boundaryIds = [];
354e15ab
DE
2210 var cumulative_y = []; // For stacked series.
2211 var datasets = [];
f09fc545 2212 var extremes = {}; // series name -> [low, high]
758a629f 2213 var i, j, k;
f09fc545 2214
b1a3b195
DV
2215 // Loop over the fields (series). Go from the last to the first,
2216 // because if they're stacked that's how we accumulate the values.
2217 var num_series = rolledSeries.length - 1;
758a629f 2218 for (i = num_series; i >= 1; i--) {
1cf11047
DV
2219 if (!this.visibility()[i - 1]) continue;
2220
16879a6b
DV
2221 // Note: this copy _is_ necessary at the moment.
2222 // If you remove it, it breaks zooming with error bars on.
2223 // TODO(danvk): investigate further & write a test for this.
2224 var series = [];
2225 for (j = 0; j < rolledSeries[i].length; j++) {
2226 series.push(rolledSeries[i][j]);
2227 }
2f5e7e1a 2228
6a1aa64f 2229 // Prune down to the desired range, if necessary (for zooming)
1a26f3fb
DV
2230 // Because there can be lines going to points outside of the visible area,
2231 // we actually prune to visible points, plus one on either side.
9922b78b 2232 var bars = this.attr_("errorBars") || this.attr_("customBars");
b1a3b195
DV
2233 if (dateWindow) {
2234 var low = dateWindow[0];
2235 var high = dateWindow[1];
6a1aa64f 2236 var pruned = [];
1a26f3fb
DV
2237 // TODO(danvk): do binary search instead of linear search.
2238 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2239 var firstIdx = null, lastIdx = null;
758a629f 2240 for (k = 0; k < series.length; k++) {
1a26f3fb
DV
2241 if (series[k][0] >= low && firstIdx === null) {
2242 firstIdx = k;
2243 }
2244 if (series[k][0] <= high) {
2245 lastIdx = k;
6a1aa64f
DV
2246 }
2247 }
1a26f3fb
DV
2248 if (firstIdx === null) firstIdx = 0;
2249 if (firstIdx > 0) firstIdx--;
2250 if (lastIdx === null) lastIdx = series.length - 1;
2251 if (lastIdx < series.length - 1) lastIdx++;
b1a3b195 2252 boundaryIds[i-1] = [firstIdx, lastIdx];
758a629f 2253 for (k = firstIdx; k <= lastIdx; k++) {
1a26f3fb 2254 pruned.push(series[k]);
6a1aa64f
DV
2255 }
2256 series = pruned;
16269f6e 2257 } else {
b1a3b195 2258 boundaryIds[i-1] = [0, series.length-1];
6a1aa64f
DV
2259 }
2260
f09fc545 2261 var seriesExtremes = this.extremeValues_(series);
5011e7a1 2262
6a1aa64f 2263 if (bars) {
758a629f 2264 for (j=0; j<series.length; j++) {
5061b42f
DV
2265 series[j] = [series[j][0],
2266 series[j][1][0],
2267 series[j][1][1],
2268 series[j][1][2]];
354e15ab 2269 }
43af96e7 2270 } else if (this.attr_("stackedGraph")) {
43af96e7
NK
2271 var l = series.length;
2272 var actual_y;
758a629f 2273 for (j = 0; j < l; j++) {
354e15ab
DE
2274 // If one data set has a NaN, let all subsequent stacked
2275 // sets inherit the NaN -- only start at 0 for the first set.
2276 var x = series[j][0];
41b0f691 2277 if (cumulative_y[x] === undefined) {
354e15ab 2278 cumulative_y[x] = 0;
41b0f691 2279 }
43af96e7
NK
2280
2281 actual_y = series[j][1];
04c104d7
KW
2282 if (actual_y === null) {
2283 series[j] = [x, null];
2284 continue;
2285 }
2286
354e15ab 2287 cumulative_y[x] += actual_y;
43af96e7 2288
758a629f 2289 series[j] = [x, cumulative_y[x]];
43af96e7 2290
41b0f691
DV
2291 if (cumulative_y[x] > seriesExtremes[1]) {
2292 seriesExtremes[1] = cumulative_y[x];
2293 }
2294 if (cumulative_y[x] < seriesExtremes[0]) {
2295 seriesExtremes[0] = cumulative_y[x];
2296 }
43af96e7 2297 }
6a1aa64f 2298 }
354e15ab 2299
b1a3b195
DV
2300 var seriesName = this.attr_("labels")[i];
2301 extremes[seriesName] = seriesExtremes;
354e15ab 2302 datasets[i] = series;
6a1aa64f
DV
2303 }
2304
7d463f49
KW
2305 // For stacked graphs, a NaN value for any point in the sum should create a
2306 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2307 if (this.attr_("stackedGraph")) {
2308 for (k = datasets.length - 1; k >= 0; --k) {
2309 // Use the first nonempty dataset to get X values.
2310 if (!datasets[k]) continue;
2311 for (j = 0; j < datasets[k].length; j++) {
2312 var x = datasets[k][j][0];
2313 if (isNaN(cumulative_y[x])) {
2314 // Set all Y values to NaN at that X value.
2315 for (i = datasets.length - 1; i >= 0; i--) {
2316 if (!datasets[i]) continue;
2317 datasets[i][j][1] = NaN;
2318 }
2319 }
2320 }
2321 break;
2322 }
2323 }
2324
b1a3b195
DV
2325 return [ datasets, extremes, boundaryIds ];
2326};
2327
2328/**
2329 * Update the graph with new data. This method is called when the viewing area
2330 * has changed. If the underlying data or options have changed, predraw_ will
2331 * be called before drawGraph_ is called.
2332 *
b1a3b195
DV
2333 * @private
2334 */
e2c21500 2335Dygraph.prototype.drawGraph_ = function() {
b1a3b195
DV
2336 var start = new Date();
2337
b1a3b195
DV
2338 // This is used to set the second parameter to drawCallback, below.
2339 var is_initial_draw = this.is_initial_draw_;
2340 this.is_initial_draw_ = false;
2341
b1a3b195
DV
2342 this.layout_.removeAllDatasets();
2343 this.setColors_();
758a629f 2344 this.attrs_.pointSize = 0.5 * this.attr_('highlightCircleSize');
b1a3b195
DV
2345
2346 var packed = this.gatherDatasets_(this.rolledSeries_, this.dateWindow_);
2347 var datasets = packed[0];
2348 var extremes = packed[1];
2349 this.boundaryIds_ = packed[2];
2350
82c6fe4d
KW
2351 this.setIndexByName_ = {};
2352 var labels = this.attr_("labels");
2353 if (labels.length > 0) {
2354 this.setIndexByName_[labels[0]] = 0;
2355 }
857a6931 2356 var dataIdx = 0;
354e15ab 2357 for (var i = 1; i < datasets.length; i++) {
82c6fe4d 2358 this.setIndexByName_[labels[i]] = i;
4523c1f6 2359 if (!this.visibility()[i - 1]) continue;
82c6fe4d 2360 this.layout_.addDataset(labels[i], datasets[i]);
857a6931 2361 this.datasetIndex_[i] = dataIdx++;
43af96e7
NK
2362 }
2363
6faebb69 2364 this.computeYAxisRanges_(extremes);
b2c9222a
DV
2365 this.layout_.setYAxes(this.axes_);
2366
6a1aa64f
DV
2367 this.addXTicks_();
2368
b2c9222a 2369 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
81856f70 2370 var tmp_zoomed_x = this.zoomed_x_;
6a1aa64f 2371 // Tell PlotKit to use this new data and render itself
b2c9222a 2372 this.layout_.setDateWindow(this.dateWindow_);
81856f70 2373 this.zoomed_x_ = tmp_zoomed_x;
6a1aa64f 2374 this.layout_.evaluateWithError();
e2c21500 2375 this.renderGraph_(is_initial_draw);
9ca829f2
DV
2376
2377 if (this.attr_("timingName")) {
2378 var end = new Date();
2379 if (console) {
758a629f 2380 console.log(this.attr_("timingName") + " - drawGraph: " + (end - start) + "ms");
9ca829f2
DV
2381 }
2382 }
2383};
2384
e2c21500
DV
2385/**
2386 * This does the work of drawing the chart. It assumes that the layout and axis
2387 * scales have already been set (e.g. by predraw_).
2388 *
2389 * @private
2390 */
2391Dygraph.prototype.renderGraph_ = function(is_initial_draw) {
1748a51c 2392 this.cascadeEvents_('clearChart');
6a1aa64f 2393 this.plotter_.clear();
f417e3d3 2394
98eb4713
DV
2395 if (this.attr_('underlayCallback')) {
2396 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2397 // users who expect a deprecated form of this callback.
2398 this.attr_('underlayCallback')(
2399 this.hidden_ctx_, this.layout_.getPlotArea(), this, this);
2400 }
2401
2402 var e = {
189f8030 2403 canvas: this.hidden_,
2de7166c 2404 drawingContext: this.hidden_ctx_
98eb4713
DV
2405 };
2406 this.cascadeEvents_('willDrawChart', e);
6a1aa64f 2407 this.plotter_.render();
98eb4713 2408 this.cascadeEvents_('didDrawChart', e);
8cfe592f
DV
2409
2410 // TODO(danvk): is this a performance bottleneck when panning?
2411 // The interaction canvas should already be empty in that situation.
f6401bf6 2412 this.canvas_.getContext('2d').clearRect(0, 0, this.canvas_.width,
2f5e7e1a 2413 this.canvas_.height);
599fb4ad 2414
4a0cb9c4 2415 // Generate a static legend before any particular point is selected.
2fccd3dc 2416
ccd9d7c2
PF
2417 if (this.rangeSelector_) {
2418 this.rangeSelector_.renderInteractiveLayer();
2419 }
599fb4ad 2420 if (this.attr_("drawCallback") !== null) {
fe0b7c03 2421 this.attr_("drawCallback")(this, is_initial_draw);
599fb4ad 2422 }
6a1aa64f
DV
2423};
2424
2425/**
629a09ae 2426 * @private
26ca7938
DV
2427 * Determine properties of the y-axes which are independent of the data
2428 * currently being displayed. This includes things like the number of axes and
2429 * the style of the axes. It does not include the range of each axis and its
2430 * tick marks.
2431 * This fills in this.axes_ and this.seriesToAxisMap_.
2432 * axes_ = [ { options } ]
2433 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2434 * indices are into the axes_ array.
f09fc545 2435 */
26ca7938 2436Dygraph.prototype.computeYAxes_ = function() {
d64b8fea
RK
2437 // Preserve valueWindow settings if they exist, and if the user hasn't
2438 // specified a new valueRange.
4dd0ac55 2439 var i, valueWindows, seriesName, axis, index, opts, v;
758a629f 2440 if (this.axes_ !== undefined && this.user_attrs_.hasOwnProperty("valueRange") === false) {
d64b8fea 2441 valueWindows = [];
758a629f 2442 for (index = 0; index < this.axes_.length; index++) {
d64b8fea
RK
2443 valueWindows.push(this.axes_[index].valueWindow);
2444 }
2445 }
2446
00aa7f61 2447 this.axes_ = [{ yAxisId : 0, g : this }]; // always have at least one y-axis.
26ca7938
DV
2448 this.seriesToAxisMap_ = {};
2449
2450 // Get a list of series names.
2451 var labels = this.attr_("labels");
1c77a3a1 2452 var series = {};
758a629f 2453 for (i = 1; i < labels.length; i++) series[labels[i]] = (i - 1);
f09fc545
DV
2454
2455 // all options which could be applied per-axis:
2456 var axisOptions = [
2457 'includeZero',
2458 'valueRange',
2459 'labelsKMB',
2460 'labelsKMG2',
2461 'pixelsPerYLabel',
2462 'yAxisLabelWidth',
2463 'axisLabelFontSize',
7d0e7a0d
RK
2464 'axisTickSize',
2465 'logscale'
f09fc545
DV
2466 ];
2467
2468 // Copy global axis options over to the first axis.
758a629f 2469 for (i = 0; i < axisOptions.length; i++) {
f09fc545 2470 var k = axisOptions[i];
4dd0ac55 2471 v = this.attr_(k);
26ca7938 2472 if (v) this.axes_[0][k] = v;
f09fc545
DV
2473 }
2474
2475 // Go through once and add all the axes.
758a629f 2476 for (seriesName in series) {
26ca7938 2477 if (!series.hasOwnProperty(seriesName)) continue;
758a629f
DV
2478 axis = this.attr_("axis", seriesName);
2479 if (axis === null) {
26ca7938 2480 this.seriesToAxisMap_[seriesName] = 0;
f09fc545
DV
2481 continue;
2482 }
2483 if (typeof(axis) == 'object') {
2484 // Add a new axis, making a copy of its per-axis options.
4dd0ac55 2485 opts = {};
26ca7938 2486 Dygraph.update(opts, this.axes_[0]);
f09fc545 2487 Dygraph.update(opts, { valueRange: null }); // shouldn't inherit this.
00aa7f61
RK
2488 var yAxisId = this.axes_.length;
2489 opts.yAxisId = yAxisId;
2490 opts.g = this;
f09fc545 2491 Dygraph.update(opts, axis);
26ca7938 2492 this.axes_.push(opts);
00aa7f61 2493 this.seriesToAxisMap_[seriesName] = yAxisId;
f09fc545
DV
2494 }
2495 }
2496
2497 // Go through one more time and assign series to an axis defined by another
2498 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
758a629f 2499 for (seriesName in series) {
26ca7938 2500 if (!series.hasOwnProperty(seriesName)) continue;
758a629f 2501 axis = this.attr_("axis", seriesName);
f09fc545 2502 if (typeof(axis) == 'string') {
26ca7938 2503 if (!this.seriesToAxisMap_.hasOwnProperty(axis)) {
f09fc545
DV
2504 this.error("Series " + seriesName + " wants to share a y-axis with " +
2505 "series " + axis + ", which does not define its own axis.");
2506 return null;
2507 }
26ca7938
DV
2508 var idx = this.seriesToAxisMap_[axis];
2509 this.seriesToAxisMap_[seriesName] = idx;
f09fc545
DV
2510 }
2511 }
1c77a3a1 2512
758a629f 2513 if (valueWindows !== undefined) {
d64b8fea 2514 // Restore valueWindow settings.
758a629f 2515 for (index = 0; index < valueWindows.length; index++) {
d64b8fea
RK
2516 this.axes_[index].valueWindow = valueWindows[index];
2517 }
2518 }
4dd0ac55
RV
2519
2520 // New axes options
2521 for (axis = 0; axis < this.axes_.length; axis++) {
2522 if (axis === 0) {
2523 opts = this.optionsViewForAxis_('y' + (axis ? '2' : ''));
2524 v = opts("valueRange");
2525 if (v) this.axes_[axis].valueRange = v;
2526 } else { // To keep old behavior
2527 var axes = this.user_attrs_.axes;
2528 if (axes && axes.y2) {
2529 v = axes.y2.valueRange;
2530 if (v) this.axes_[axis].valueRange = v;
2531 }
2532 }
2533 }
2534
26ca7938
DV
2535};
2536
2537/**
2538 * Returns the number of y-axes on the chart.
2539 * @return {Number} the number of axes.
2540 */
2541Dygraph.prototype.numAxes = function() {
2542 var last_axis = 0;
2543 for (var series in this.seriesToAxisMap_) {
2544 if (!this.seriesToAxisMap_.hasOwnProperty(series)) continue;
2545 var idx = this.seriesToAxisMap_[series];
2546 if (idx > last_axis) last_axis = idx;
2547 }
2548 return 1 + last_axis;
2549};
2550
2551/**
629a09ae 2552 * @private
b2c9222a
DV
2553 * Returns axis properties for the given series.
2554 * @param { String } setName The name of the series for which to get axis
2555 * properties, e.g. 'Y1'.
2556 * @return { Object } The axis properties.
2557 */
2558Dygraph.prototype.axisPropertiesForSeries = function(series) {
2559 // TODO(danvk): handle errors.
2560 return this.axes_[this.seriesToAxisMap_[series]];
2561};
2562
2563/**
2564 * @private
26ca7938
DV
2565 * Determine the value range and tick marks for each axis.
2566 * @param {Object} extremes A mapping from seriesName -> [low, high]
2567 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2568 */
2569Dygraph.prototype.computeYAxisRanges_ = function(extremes) {
2570 // Build a map from axis number -> [list of series names]
758a629f
DV
2571 var seriesForAxis = [], series;
2572 for (series in this.seriesToAxisMap_) {
26ca7938
DV
2573 if (!this.seriesToAxisMap_.hasOwnProperty(series)) continue;
2574 var idx = this.seriesToAxisMap_[series];
2575 while (seriesForAxis.length <= idx) seriesForAxis.push([]);
2576 seriesForAxis[idx].push(series);
2577 }
f09fc545
DV
2578
2579 // Compute extreme values, a span and tick marks for each axis.
26ca7938
DV
2580 for (var i = 0; i < this.axes_.length; i++) {
2581 var axis = this.axes_[i];
25f76ae3 2582
06fc69b6
AV
2583 if (!seriesForAxis[i]) {
2584 // If no series are defined or visible then use a reasonable default
2585 axis.extremeRange = [0, 1];
2586 } else {
1c77a3a1 2587 // Calculate the extremes of extremes.
758a629f 2588 series = seriesForAxis[i];
f09fc545
DV
2589 var minY = Infinity; // extremes[series[0]][0];
2590 var maxY = -Infinity; // extremes[series[0]][1];
ba049b89 2591 var extremeMinY, extremeMaxY;
a2da3777 2592
f09fc545 2593 for (var j = 0; j < series.length; j++) {
a2da3777
DV
2594 // this skips invisible series
2595 if (!extremes.hasOwnProperty(series[j])) continue;
2596
ba049b89
NN
2597 // Only use valid extremes to stop null data series' from corrupting the scale.
2598 extremeMinY = extremes[series[j]][0];
758a629f 2599 if (extremeMinY !== null) {
36dfa958 2600 minY = Math.min(extremeMinY, minY);
ba049b89
NN
2601 }
2602 extremeMaxY = extremes[series[j]][1];
758a629f 2603 if (extremeMaxY !== null) {
36dfa958 2604 maxY = Math.max(extremeMaxY, maxY);
ba049b89 2605 }
f09fc545
DV
2606 }
2607 if (axis.includeZero && minY > 0) minY = 0;
2608
a2da3777 2609 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
36dfa958 2610 if (minY == Infinity) minY = 0;
a2da3777 2611 if (maxY == -Infinity) maxY = 1;
ba049b89 2612
f09fc545
DV
2613 // Add some padding and round up to an integer to be human-friendly.
2614 var span = maxY - minY;
2615 // special case: if we have no sense of scale, use +/-10% of the sole value.
758a629f 2616 if (span === 0) { span = maxY; }
f09fc545 2617
758a629f 2618 var maxAxisY, minAxisY;
7d0e7a0d 2619 if (axis.logscale) {
758a629f
DV
2620 maxAxisY = maxY + 0.1 * span;
2621 minAxisY = minY;
ff022deb 2622 } else {
758a629f
DV
2623 maxAxisY = maxY + 0.1 * span;
2624 minAxisY = minY - 0.1 * span;
f09fc545 2625
ff022deb
RK
2626 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2627 if (!this.attr_("avoidMinZero")) {
2628 if (minAxisY < 0 && minY >= 0) minAxisY = 0;
2629 if (maxAxisY > 0 && maxY <= 0) maxAxisY = 0;
2630 }
f09fc545 2631
ff022deb
RK
2632 if (this.attr_("includeZero")) {
2633 if (maxY < 0) maxAxisY = 0;
2634 if (minY > 0) minAxisY = 0;
2635 }
f09fc545 2636 }
4cac8c7a
RK
2637 axis.extremeRange = [minAxisY, maxAxisY];
2638 }
2639 if (axis.valueWindow) {
2640 // This is only set if the user has zoomed on the y-axis. It is never set
2641 // by a user. It takes precedence over axis.valueRange because, if you set
2642 // valueRange, you'd still expect to be able to pan.
2643 axis.computedValueRange = [axis.valueWindow[0], axis.valueWindow[1]];
2644 } else if (axis.valueRange) {
2645 // This is a user-set value range for this axis.
2646 axis.computedValueRange = [axis.valueRange[0], axis.valueRange[1]];
2647 } else {
2648 axis.computedValueRange = axis.extremeRange;
f09fc545
DV
2649 }
2650
0d64e596
DV
2651 // Add ticks. By default, all axes inherit the tick positions of the
2652 // primary axis. However, if an axis is specifically marked as having
2653 // independent ticks, then that is permissible as well.
48e614ac
DV
2654 var opts = this.optionsViewForAxis_('y' + (i ? '2' : ''));
2655 var ticker = opts('ticker');
758a629f 2656 if (i === 0 || axis.independentTicks) {
48e614ac
DV
2657 axis.ticks = ticker(axis.computedValueRange[0],
2658 axis.computedValueRange[1],
2659 this.height_, // TODO(danvk): should be area.height
2660 opts,
2661 this);
0d64e596
DV
2662 } else {
2663 var p_axis = this.axes_[0];
2664 var p_ticks = p_axis.ticks;
2665 var p_scale = p_axis.computedValueRange[1] - p_axis.computedValueRange[0];
2666 var scale = axis.computedValueRange[1] - axis.computedValueRange[0];
2667 var tick_values = [];
25f76ae3
DV
2668 for (var k = 0; k < p_ticks.length; k++) {
2669 var y_frac = (p_ticks[k].v - p_axis.computedValueRange[0]) / p_scale;
0d64e596
DV
2670 var y_val = axis.computedValueRange[0] + y_frac * scale;
2671 tick_values.push(y_val);
2672 }
2673
48e614ac
DV
2674 axis.ticks = ticker(axis.computedValueRange[0],
2675 axis.computedValueRange[1],
2676 this.height_, // TODO(danvk): should be area.height
2677 opts,
2678 this,
2679 tick_values);
0d64e596 2680 }
f09fc545 2681 }
f09fc545 2682};
25f76ae3 2683
f09fc545 2684/**
b1a3b195
DV
2685 * Extracts one series from the raw data (a 2D array) into an array of (date,
2686 * value) tuples.
2687 *
2688 * This is where undesirable points (i.e. negative values on log scales and
2689 * missing values through which we wish to connect lines) are dropped.
0604287e 2690 * TODO(danvk): the "missing values" bit above doesn't seem right.
de8f284f 2691 *
b1a3b195
DV
2692 * @private
2693 */
04c104d7 2694Dygraph.prototype.extractSeries_ = function(rawData, i, logScale) {
0604287e 2695 // TODO(danvk): pre-allocate series here.
b1a3b195
DV
2696 var series = [];
2697 for (var j = 0; j < rawData.length; j++) {
2698 var x = rawData[j][0];
2699 var point = rawData[j][i];
2700 if (logScale) {
2701 // On the log scale, points less than zero do not exist.
04c104d7 2702 // This will create a gap in the chart.
b1a3b195
DV
2703 if (point <= 0) {
2704 point = null;
2705 }
b1a3b195 2706 }
04c104d7 2707 series.push([x, point]);
b1a3b195
DV
2708 }
2709 return series;
2710};
2711
2712/**
629a09ae 2713 * @private
6a1aa64f
DV
2714 * Calculates the rolling average of a data set.
2715 * If originalData is [label, val], rolls the average of those.
2716 * If originalData is [label, [, it's interpreted as [value, stddev]
2717 * and the roll is returned in the same form, with appropriately reduced
2718 * stddev for each value.
2719 * Note that this is where fractional input (i.e. '5/10') is converted into
2720 * decimal values.
2721 * @param {Array} originalData The data in the appropriate format (see above)
6faebb69
JB
2722 * @param {Number} rollPeriod The number of points over which to average the
2723 * data
6a1aa64f 2724 */
285a6bda 2725Dygraph.prototype.rollingAverage = function(originalData, rollPeriod) {
6a1aa64f
DV
2726 if (originalData.length < 2)
2727 return originalData;
758a629f 2728 rollPeriod = Math.min(rollPeriod, originalData.length);
6a1aa64f 2729 var rollingData = [];
285a6bda 2730 var sigma = this.attr_("sigma");
6a1aa64f 2731
758a629f 2732 var low, high, i, j, y, sum, num_ok, stddev;
6a1aa64f
DV
2733 if (this.fractions_) {
2734 var num = 0;
2735 var den = 0; // numerator/denominator
2736 var mult = 100.0;
758a629f 2737 for (i = 0; i < originalData.length; i++) {
6a1aa64f
DV
2738 num += originalData[i][1][0];
2739 den += originalData[i][1][1];
2740 if (i - rollPeriod >= 0) {
2741 num -= originalData[i - rollPeriod][1][0];
2742 den -= originalData[i - rollPeriod][1][1];
2743 }
2744
2745 var date = originalData[i][0];
2746 var value = den ? num / den : 0.0;
285a6bda 2747 if (this.attr_("errorBars")) {
395e98a3 2748 if (this.attr_("wilsonInterval")) {
6a1aa64f
DV
2749 // For more details on this confidence interval, see:
2750 // http://en.wikipedia.org/wiki/Binomial_confidence_interval
2751 if (den) {
2752 var p = value < 0 ? 0 : value, n = den;
2753 var pm = sigma * Math.sqrt(p*(1-p)/n + sigma*sigma/(4*n*n));
2754 var denom = 1 + sigma * sigma / den;
758a629f
DV
2755 low = (p + sigma * sigma / (2 * den) - pm) / denom;
2756 high = (p + sigma * sigma / (2 * den) + pm) / denom;
6a1aa64f
DV
2757 rollingData[i] = [date,
2758 [p * mult, (p - low) * mult, (high - p) * mult]];
2759 } else {
2760 rollingData[i] = [date, [0, 0, 0]];
2761 }
2762 } else {
758a629f 2763 stddev = den ? sigma * Math.sqrt(value * (1 - value) / den) : 1.0;
6a1aa64f
DV
2764 rollingData[i] = [date, [mult * value, mult * stddev, mult * stddev]];
2765 }
2766 } else {
2767 rollingData[i] = [date, mult * value];
2768 }
2769 }
9922b78b 2770 } else if (this.attr_("customBars")) {
758a629f 2771 low = 0;
f6885d6a 2772 var mid = 0;
758a629f 2773 high = 0;
f6885d6a 2774 var count = 0;
758a629f 2775 for (i = 0; i < originalData.length; i++) {
6a1aa64f 2776 var data = originalData[i][1];
758a629f 2777 y = data[1];
6a1aa64f 2778 rollingData[i] = [originalData[i][0], [y, y - data[0], data[2] - y]];
f6885d6a 2779
758a629f 2780 if (y !== null && !isNaN(y)) {
49a7d0d5
DV
2781 low += data[0];
2782 mid += y;
2783 high += data[2];
2784 count += 1;
2785 }
f6885d6a
DV
2786 if (i - rollPeriod >= 0) {
2787 var prev = originalData[i - rollPeriod];
758a629f 2788 if (prev[1][1] !== null && !isNaN(prev[1][1])) {
49a7d0d5
DV
2789 low -= prev[1][0];
2790 mid -= prev[1][1];
2791 high -= prev[1][2];
2792 count -= 1;
2793 }
f6885d6a 2794 }
502d5996
DV
2795 if (count) {
2796 rollingData[i] = [originalData[i][0], [ 1.0 * mid / count,
2797 1.0 * (mid - low) / count,
2798 1.0 * (high - mid) / count ]];
2799 } else {
2800 rollingData[i] = [originalData[i][0], [null, null, null]];
2801 }
2769de62 2802 }
6a1aa64f
DV
2803 } else {
2804 // Calculate the rolling average for the first rollPeriod - 1 points where
6faebb69 2805 // there is not enough data to roll over the full number of points
285a6bda 2806 if (!this.attr_("errorBars")){
5011e7a1
DV
2807 if (rollPeriod == 1) {
2808 return originalData;
2809 }
2810
758a629f
DV
2811 for (i = 0; i < originalData.length; i++) {
2812 sum = 0;
2813 num_ok = 0;
2814 for (j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) {
2815 y = originalData[j][1];
2816 if (y === null || isNaN(y)) continue;
5011e7a1 2817 num_ok++;
2847c1cf 2818 sum += originalData[j][1];
6a1aa64f 2819 }
5011e7a1 2820 if (num_ok) {
2847c1cf 2821 rollingData[i] = [originalData[i][0], sum / num_ok];
5011e7a1 2822 } else {
2847c1cf 2823 rollingData[i] = [originalData[i][0], null];
5011e7a1 2824 }
6a1aa64f 2825 }
2847c1cf
DV
2826
2827 } else {
758a629f
DV
2828 for (i = 0; i < originalData.length; i++) {
2829 sum = 0;
6a1aa64f 2830 var variance = 0;
758a629f
DV
2831 num_ok = 0;
2832 for (j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) {
2833 y = originalData[j][1][0];
2834 if (y === null || isNaN(y)) continue;
5011e7a1 2835 num_ok++;
6a1aa64f
DV
2836 sum += originalData[j][1][0];
2837 variance += Math.pow(originalData[j][1][1], 2);
2838 }
5011e7a1 2839 if (num_ok) {
758a629f 2840 stddev = Math.sqrt(variance) / num_ok;
5011e7a1
DV
2841 rollingData[i] = [originalData[i][0],
2842 [sum / num_ok, sigma * stddev, sigma * stddev]];
2843 } else {
2844 rollingData[i] = [originalData[i][0], [null, null, null]];
2845 }
6a1aa64f
DV
2846 }
2847 }
2848 }
2849
2850 return rollingData;
2851};
2852
2853/**
285a6bda
DV
2854 * Detects the type of the str (date or numeric) and sets the various
2855 * formatting attributes in this.attrs_ based on this type.
2856 * @param {String} str An x value.
2857 * @private
2858 */
2859Dygraph.prototype.detectTypeFromString_ = function(str) {
2860 var isDate = false;
0842b24b
DV
2861 var dashPos = str.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2862 if ((dashPos > 0 && (str[dashPos-1] != 'e' && str[dashPos-1] != 'E')) ||
285a6bda
DV
2863 str.indexOf('/') >= 0 ||
2864 isNaN(parseFloat(str))) {
2865 isDate = true;
2866 } else if (str.length == 8 && str > '19700101' && str < '20371231') {
2867 // TODO(danvk): remove support for this format.
2868 isDate = true;
2869 }
2870
2871 if (isDate) {
285a6bda 2872 this.attrs_.xValueParser = Dygraph.dateParser;
48e614ac
DV
2873 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
2874 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
2875 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
285a6bda 2876 } else {
c39e1d93 2877 /** @private (shut up, jsdoc!) */
285a6bda 2878 this.attrs_.xValueParser = function(x) { return parseFloat(x); };
48e614ac
DV
2879 // TODO(danvk): use Dygraph.numberValueFormatter here?
2880 /** @private (shut up, jsdoc!) */
2881 this.attrs_.axes.x.valueFormatter = function(x) { return x; };
44462ba3 2882 this.attrs_.axes.x.ticker = Dygraph.numericLinearTicks;
48e614ac 2883 this.attrs_.axes.x.axisLabelFormatter = this.attrs_.axes.x.valueFormatter;
6a1aa64f 2884 }
6a1aa64f
DV
2885};
2886
2887/**
5cd7ac68
DV
2888 * Parses the value as a floating point number. This is like the parseFloat()
2889 * built-in, but with a few differences:
2890 * - the empty string is parsed as null, rather than NaN.
2891 * - if the string cannot be parsed at all, an error is logged.
2892 * If the string can't be parsed, this method returns null.
2893 * @param {String} x The string to be parsed
2894 * @param {Number} opt_line_no The line number from which the string comes.
2895 * @param {String} opt_line The text of the line from which the string comes.
2896 * @private
2897 */
2898
2899// Parse the x as a float or return null if it's not a number.
2900Dygraph.prototype.parseFloat_ = function(x, opt_line_no, opt_line) {
2901 var val = parseFloat(x);
2902 if (!isNaN(val)) return val;
2903
2904 // Try to figure out what happeend.
2905 // If the value is the empty string, parse it as null.
2906 if (/^ *$/.test(x)) return null;
2907
2908 // If it was actually "NaN", return it as NaN.
2909 if (/^ *nan *$/i.test(x)) return NaN;
2910
2911 // Looks like a parsing error.
2912 var msg = "Unable to parse '" + x + "' as a number";
2913 if (opt_line !== null && opt_line_no !== null) {
2914 msg += " on line " + (1+opt_line_no) + " ('" + opt_line + "') of CSV.";
2915 }
2916 this.error(msg);
2917
2918 return null;
2919};
2920
2921/**
629a09ae 2922 * @private
6a1aa64f
DV
2923 * Parses a string in a special csv format. We expect a csv file where each
2924 * line is a date point, and the first field in each line is the date string.
2925 * We also expect that all remaining fields represent series.
285a6bda 2926 * if the errorBars attribute is set, then interpret the fields as:
6a1aa64f 2927 * date, series1, stddev1, series2, stddev2, ...
629a09ae 2928 * @param {[Object]} data See above.
285a6bda 2929 *
629a09ae 2930 * @return [Object] An array with one entry for each row. These entries
285a6bda
DV
2931 * are an array of cells in that row. The first entry is the parsed x-value for
2932 * the row. The second, third, etc. are the y-values. These can take on one of
2933 * three forms, depending on the CSV and constructor parameters:
2934 * 1. numeric value
2935 * 2. [ value, stddev ]
2936 * 3. [ low value, center value, high value ]
6a1aa64f 2937 */
285a6bda 2938Dygraph.prototype.parseCSV_ = function(data) {
6a1aa64f 2939 var ret = [];
e5763589
DV
2940 var line_delimiter = Dygraph.detectLineDelimiter(data);
2941 var lines = data.split(line_delimiter || "\n");
758a629f 2942 var vals, j;
3d67f03b
DV
2943
2944 // Use the default delimiter or fall back to a tab if that makes sense.
2945 var delim = this.attr_('delimiter');
2946 if (lines[0].indexOf(delim) == -1 && lines[0].indexOf('\t') >= 0) {
2947 delim = '\t';
2948 }
2949
285a6bda 2950 var start = 0;
d7beab6b
DV
2951 if (!('labels' in this.user_attrs_)) {
2952 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
285a6bda 2953 start = 1;
d7beab6b 2954 this.attrs_.labels = lines[0].split(delim); // NOTE: _not_ user_attrs_.
6a1aa64f 2955 }
5cd7ac68 2956 var line_no = 0;
03b522a4 2957
285a6bda
DV
2958 var xParser;
2959 var defaultParserSet = false; // attempt to auto-detect x value type
2960 var expectedCols = this.attr_("labels").length;
987840a2 2961 var outOfOrder = false;
6a1aa64f
DV
2962 for (var i = start; i < lines.length; i++) {
2963 var line = lines[i];
5cd7ac68 2964 line_no = i;
758a629f 2965 if (line.length === 0) continue; // skip blank lines
3d67f03b
DV
2966 if (line[0] == '#') continue; // skip comment lines
2967 var inFields = line.split(delim);
285a6bda 2968 if (inFields.length < 2) continue;
6a1aa64f
DV
2969
2970 var fields = [];
285a6bda
DV
2971 if (!defaultParserSet) {
2972 this.detectTypeFromString_(inFields[0]);
2973 xParser = this.attr_("xValueParser");
2974 defaultParserSet = true;
2975 }
2976 fields[0] = xParser(inFields[0], this);
6a1aa64f
DV
2977
2978 // If fractions are expected, parse the numbers as "A/B"
2979 if (this.fractions_) {
758a629f 2980 for (j = 1; j < inFields.length; j++) {
6a1aa64f 2981 // TODO(danvk): figure out an appropriate way to flag parse errors.
758a629f 2982 vals = inFields[j].split("/");
7219edb3
DV
2983 if (vals.length != 2) {
2984 this.error('Expected fractional "num/den" values in CSV data ' +
2985 "but found a value '" + inFields[j] + "' on line " +
2986 (1 + i) + " ('" + line + "') which is not of this form.");
2987 fields[j] = [0, 0];
2988 } else {
2989 fields[j] = [this.parseFloat_(vals[0], i, line),
2990 this.parseFloat_(vals[1], i, line)];
2991 }
6a1aa64f 2992 }
285a6bda 2993 } else if (this.attr_("errorBars")) {
6a1aa64f 2994 // If there are error bars, values are (value, stddev) pairs
7219edb3
DV
2995 if (inFields.length % 2 != 1) {
2996 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2997 'but line ' + (1 + i) + ' has an odd number of values (' +
2998 (inFields.length - 1) + "): '" + line + "'");
2999 }
758a629f 3000 for (j = 1; j < inFields.length; j += 2) {
5cd7ac68
DV
3001 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
3002 this.parseFloat_(inFields[j + 1], i, line)];
7219edb3 3003 }
9922b78b 3004 } else if (this.attr_("customBars")) {
6a1aa64f 3005 // Bars are a low;center;high tuple
758a629f 3006 for (j = 1; j < inFields.length; j++) {
327a9279
DV
3007 var val = inFields[j];
3008 if (/^ *$/.test(val)) {
3009 fields[j] = [null, null, null];
3010 } else {
758a629f 3011 vals = val.split(";");
327a9279
DV
3012 if (vals.length == 3) {
3013 fields[j] = [ this.parseFloat_(vals[0], i, line),
3014 this.parseFloat_(vals[1], i, line),
3015 this.parseFloat_(vals[2], i, line) ];
3016 } else {
1a5dc2af
RK
3017 this.warn('When using customBars, values must be either blank ' +
3018 'or "low;center;high" tuples (got "' + val +
3019 '" on line ' + (1+i));
327a9279
DV
3020 }
3021 }
6a1aa64f
DV
3022 }
3023 } else {
3024 // Values are just numbers
758a629f 3025 for (j = 1; j < inFields.length; j++) {
5cd7ac68 3026 fields[j] = this.parseFloat_(inFields[j], i, line);
285a6bda 3027 }
6a1aa64f 3028 }
987840a2
DV
3029 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
3030 outOfOrder = true;
3031 }
285a6bda
DV
3032
3033 if (fields.length != expectedCols) {
3034 this.error("Number of columns in line " + i + " (" + fields.length +
3035 ") does not agree with number of labels (" + expectedCols +
3036 ") " + line);
3037 }
6d0aaa09
DV
3038
3039 // If the user specified the 'labels' option and none of the cells of the
3040 // first row parsed correctly, then they probably double-specified the
3041 // labels. We go with the values set in the option, discard this row and
3042 // log a warning to the JS console.
758a629f 3043 if (i === 0 && this.attr_('labels')) {
6d0aaa09 3044 var all_null = true;
758a629f 3045 for (j = 0; all_null && j < fields.length; j++) {
6d0aaa09
DV
3046 if (fields[j]) all_null = false;
3047 }
3048 if (all_null) {
3049 this.warn("The dygraphs 'labels' option is set, but the first row of " +
3050 "CSV data ('" + line + "') appears to also contain labels. " +
3051 "Will drop the CSV labels and use the option labels.");
3052 continue;
3053 }
3054 }
3055 ret.push(fields);
6a1aa64f 3056 }
987840a2
DV
3057
3058 if (outOfOrder) {
3059 this.warn("CSV is out of order; order it correctly to speed loading.");
758a629f 3060 ret.sort(function(a,b) { return a[0] - b[0]; });
987840a2
DV
3061 }
3062
6a1aa64f
DV
3063 return ret;
3064};
3065
3066/**
629a09ae 3067 * @private
285a6bda
DV
3068 * The user has provided their data as a pre-packaged JS array. If the x values
3069 * are numeric, this is the same as dygraphs' internal format. If the x values
3070 * are dates, we need to convert them from Date objects to ms since epoch.
629a09ae
DV
3071 * @param {[Object]} data
3072 * @return {[Object]} data with numeric x values.
285a6bda
DV
3073 */
3074Dygraph.prototype.parseArray_ = function(data) {
3075 // Peek at the first x value to see if it's numeric.
758a629f 3076 if (data.length === 0) {
285a6bda
DV
3077 this.error("Can't plot empty data set");
3078 return null;
3079 }
758a629f 3080 if (data[0].length === 0) {
285a6bda
DV
3081 this.error("Data set cannot contain an empty row");
3082 return null;
3083 }
3084
758a629f
DV
3085 var i;
3086 if (this.attr_("labels") === null) {
285a6bda
DV
3087 this.warn("Using default labels. Set labels explicitly via 'labels' " +
3088 "in the options parameter");
3089 this.attrs_.labels = [ "X" ];
758a629f 3090 for (i = 1; i < data[0].length; i++) {
285a6bda
DV
3091 this.attrs_.labels.push("Y" + i);
3092 }
debdb88d
DV
3093 } else {
3094 var num_labels = this.attr_("labels");
3095 if (num_labels.length != data[0].length) {
3096 this.error("Mismatch between number of labels (" + num_labels +
3097 ") and number of columns in array (" + data[0].length + ")");
3098 return null;
3099 }
285a6bda
DV
3100 }
3101
2dda3850 3102 if (Dygraph.isDateLike(data[0][0])) {
285a6bda 3103 // Some intelligent defaults for a date x-axis.
48e614ac
DV
3104 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3105 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3106 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
285a6bda
DV
3107
3108 // Assume they're all dates.
e3ab7b40 3109 var parsedData = Dygraph.clone(data);
758a629f
DV
3110 for (i = 0; i < data.length; i++) {
3111 if (parsedData[i].length === 0) {
a323ff4a 3112 this.error("Row " + (1 + i) + " of data is empty");
285a6bda
DV
3113 return null;
3114 }
758a629f
DV
3115 if (parsedData[i][0] === null ||
3116 typeof(parsedData[i][0].getTime) != 'function' ||
3117 isNaN(parsedData[i][0].getTime())) {
be96a1f5 3118 this.error("x value in row " + (1 + i) + " is not a Date");
285a6bda
DV
3119 return null;
3120 }
3121 parsedData[i][0] = parsedData[i][0].getTime();
3122 }
3123 return parsedData;
3124 } else {
3125 // Some intelligent defaults for a numeric x-axis.
c39e1d93 3126 /** @private (shut up, jsdoc!) */
48e614ac
DV
3127 this.attrs_.axes.x.valueFormatter = function(x) { return x; };
3128 this.attrs_.axes.x.axisLabelFormatter = Dygraph.numberAxisLabelFormatter;
44462ba3 3129 this.attrs_.axes.x.ticker = Dygraph.numericLinearTicks;
285a6bda
DV
3130 return data;
3131 }
3132};
3133
3134/**
79420a1e
DV
3135 * Parses a DataTable object from gviz.
3136 * The data is expected to have a first column that is either a date or a
3137 * number. All subsequent columns must be numbers. If there is a clear mismatch
3138 * between this.xValueParser_ and the type of the first column, it will be
a685723c 3139 * fixed. Fills out rawData_.
629a09ae 3140 * @param {[Object]} data See above.
79420a1e
DV
3141 * @private
3142 */
285a6bda 3143Dygraph.prototype.parseDataTable_ = function(data) {
5829af3d 3144 var shortTextForAnnotationNum = function(num) {
3145 // converts [0-9]+ [A-Z][a-z]*
3146 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3147 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3148 var shortText = String.fromCharCode(65 /* A */ + num % 26);
3149 num = Math.floor(num / 26);
3150 while ( num > 0 ) {
3151 shortText = String.fromCharCode(65 /* A */ + (num - 1) % 26 ) + shortText.toLowerCase();
3152 num = Math.floor((num - 1) / 26);
3153 }
3154 return shortText;
42a9ebb8 3155 };
5829af3d 3156
79420a1e
DV
3157 var cols = data.getNumberOfColumns();
3158 var rows = data.getNumberOfRows();
3159
d955e223 3160 var indepType = data.getColumnType(0);
4440f6c8 3161 if (indepType == 'date' || indepType == 'datetime') {
285a6bda 3162 this.attrs_.xValueParser = Dygraph.dateParser;
48e614ac
DV
3163 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3164 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3165 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
33127159 3166 } else if (indepType == 'number') {
285a6bda 3167 this.attrs_.xValueParser = function(x) { return parseFloat(x); };
48e614ac 3168 this.attrs_.axes.x.valueFormatter = function(x) { return x; };
44462ba3 3169 this.attrs_.axes.x.ticker = Dygraph.numericLinearTicks;
48e614ac 3170 this.attrs_.axes.x.axisLabelFormatter = this.attrs_.axes.x.valueFormatter;
285a6bda 3171 } else {
987840a2
DV
3172 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3173 "column 1 of DataTable input (Got '" + indepType + "')");
79420a1e
DV
3174 return null;
3175 }
3176
a685723c
DV
3177 // Array of the column indices which contain data (and not annotations).
3178 var colIdx = [];
3179 var annotationCols = {}; // data index -> [annotation cols]
3180 var hasAnnotations = false;
758a629f
DV
3181 var i, j;
3182 for (i = 1; i < cols; i++) {
a685723c
DV
3183 var type = data.getColumnType(i);
3184 if (type == 'number') {
3185 colIdx.push(i);
3186 } else if (type == 'string' && this.attr_('displayAnnotations')) {
3187 // This is OK -- it's an annotation column.
3188 var dataIdx = colIdx[colIdx.length - 1];
3189 if (!annotationCols.hasOwnProperty(dataIdx)) {
3190 annotationCols[dataIdx] = [i];
3191 } else {
3192 annotationCols[dataIdx].push(i);
3193 }
3194 hasAnnotations = true;
3195 } else {
3196 this.error("Only 'number' is supported as a dependent type with Gviz." +
3197 " 'string' is only supported if displayAnnotations is true");
3198 }
3199 }
3200
3201 // Read column labels
3202 // TODO(danvk): add support back for errorBars
3203 var labels = [data.getColumnLabel(0)];
758a629f 3204 for (i = 0; i < colIdx.length; i++) {
a685723c 3205 labels.push(data.getColumnLabel(colIdx[i]));
f9348814 3206 if (this.attr_("errorBars")) i += 1;
a685723c
DV
3207 }
3208 this.attrs_.labels = labels;
3209 cols = labels.length;
3210
79420a1e 3211 var ret = [];
987840a2 3212 var outOfOrder = false;
a685723c 3213 var annotations = [];
758a629f 3214 for (i = 0; i < rows; i++) {
79420a1e 3215 var row = [];
debe4434
DV
3216 if (typeof(data.getValue(i, 0)) === 'undefined' ||
3217 data.getValue(i, 0) === null) {
129569a5
FD
3218 this.warn("Ignoring row " + i +
3219 " of DataTable because of undefined or null first column.");
debe4434
DV
3220 continue;
3221 }
3222
c21d2c2d 3223 if (indepType == 'date' || indepType == 'datetime') {
d955e223
DV
3224 row.push(data.getValue(i, 0).getTime());
3225 } else {
3226 row.push(data.getValue(i, 0));
3227 }
3e3f84e4 3228 if (!this.attr_("errorBars")) {
758a629f 3229 for (j = 0; j < colIdx.length; j++) {
a685723c
DV
3230 var col = colIdx[j];
3231 row.push(data.getValue(i, col));
3232 if (hasAnnotations &&
3233 annotationCols.hasOwnProperty(col) &&
758a629f 3234 data.getValue(i, annotationCols[col][0]) !== null) {
a685723c
DV
3235 var ann = {};
3236 ann.series = data.getColumnLabel(col);
3237 ann.xval = row[0];
5829af3d 3238 ann.shortText = shortTextForAnnotationNum(annotations.length);
a685723c
DV
3239 ann.text = '';
3240 for (var k = 0; k < annotationCols[col].length; k++) {
3241 if (k) ann.text += "\n";
3242 ann.text += data.getValue(i, annotationCols[col][k]);
3243 }
3244 annotations.push(ann);
3245 }
3e3f84e4 3246 }
92fd68d8
DV
3247
3248 // Strip out infinities, which give dygraphs problems later on.
758a629f 3249 for (j = 0; j < row.length; j++) {
92fd68d8
DV
3250 if (!isFinite(row[j])) row[j] = null;
3251 }
3e3f84e4 3252 } else {
758a629f 3253 for (j = 0; j < cols - 1; j++) {
3e3f84e4
DV
3254 row.push([ data.getValue(i, 1 + 2 * j), data.getValue(i, 2 + 2 * j) ]);
3255 }
79420a1e 3256 }
987840a2
DV
3257 if (ret.length > 0 && row[0] < ret[ret.length - 1][0]) {
3258 outOfOrder = true;
3259 }
243d96e8 3260 ret.push(row);
79420a1e 3261 }
987840a2
DV
3262
3263 if (outOfOrder) {
3264 this.warn("DataTable is out of order; order it correctly to speed loading.");
758a629f 3265 ret.sort(function(a,b) { return a[0] - b[0]; });
987840a2 3266 }
a685723c
DV
3267 this.rawData_ = ret;
3268
3269 if (annotations.length > 0) {
3270 this.setAnnotations(annotations, true);
3271 }
758a629f 3272};
79420a1e 3273
629a09ae 3274/**
6a1aa64f
DV
3275 * Get the CSV data. If it's in a function, call that function. If it's in a
3276 * file, do an XMLHttpRequest to get it.
3277 * @private
3278 */
285a6bda 3279Dygraph.prototype.start_ = function() {
36d4fabf
RK
3280 var data = this.file_;
3281
3282 // Functions can return references of all other types.
3283 if (typeof data == 'function') {
3284 data = data();
3285 }
3286
3287 if (Dygraph.isArrayLike(data)) {
3288 this.rawData_ = this.parseArray_(data);
26ca7938 3289 this.predraw_();
36d4fabf
RK
3290 } else if (typeof data == 'object' &&
3291 typeof data.getColumnRange == 'function') {
79420a1e 3292 // must be a DataTable from gviz.
36d4fabf 3293 this.parseDataTable_(data);
26ca7938 3294 this.predraw_();
36d4fabf 3295 } else if (typeof data == 'string') {
285a6bda 3296 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
e5763589
DV
3297 var line_delimiter = Dygraph.detectLineDelimiter(data);
3298 if (line_delimiter) {
36d4fabf 3299 this.loadedEvent_(data);
285a6bda
DV
3300 } else {
3301 var req = new XMLHttpRequest();
3302 var caller = this;
3303 req.onreadystatechange = function () {
3304 if (req.readyState == 4) {
758a629f
DV
3305 if (req.status === 200 || // Normal http
3306 req.status === 0) { // Chrome w/ --allow-file-access-from-files
285a6bda
DV
3307 caller.loadedEvent_(req.responseText);
3308 }
6a1aa64f 3309 }
285a6bda 3310 };
6a1aa64f 3311
36d4fabf 3312 req.open("GET", data, true);
285a6bda
DV
3313 req.send(null);
3314 }
3315 } else {
36d4fabf 3316 this.error("Unknown data format: " + (typeof data));
6a1aa64f
DV
3317 }
3318};
3319
3320/**
3321 * Changes various properties of the graph. These can include:
3322 * <ul>
3323 * <li>file: changes the source data for the graph</li>
3324 * <li>errorBars: changes whether the data contains stddev</li>
3325 * </ul>
dcb25130 3326 *
ccfcc169
DV
3327 * There's a huge variety of options that can be passed to this method. For a
3328 * full list, see http://dygraphs.com/options.html.
3329 *
6a1aa64f 3330 * @param {Object} attrs The new properties and values
ccfcc169
DV
3331 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3332 * call to updateOptions(). If you know better, you can pass true to explicitly
3333 * block the redraw. This can be useful for chaining updateOptions() calls,
3334 * avoiding the occasional infinite loop and preventing redraws when it's not
3335 * necessary (e.g. when updating a callback).
6a1aa64f 3336 */
48e614ac 3337Dygraph.prototype.updateOptions = function(input_attrs, block_redraw) {
ccfcc169
DV
3338 if (typeof(block_redraw) == 'undefined') block_redraw = false;
3339
48e614ac 3340 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
758a629f 3341 var file = input_attrs.file;
48e614ac
DV
3342 var attrs = Dygraph.mapLegacyOptions_(input_attrs);
3343
ccfcc169 3344 // TODO(danvk): this is a mess. Move these options into attr_.
c65f2303 3345 if ('rollPeriod' in attrs) {
6a1aa64f
DV
3346 this.rollPeriod_ = attrs.rollPeriod;
3347 }
c65f2303 3348 if ('dateWindow' in attrs) {
6a1aa64f 3349 this.dateWindow_ = attrs.dateWindow;
e5152598 3350 if (!('isZoomedIgnoreProgrammaticZoom' in attrs)) {
758a629f 3351 this.zoomed_x_ = (attrs.dateWindow !== null);
81856f70 3352 }
b7e5862d 3353 }
e5152598 3354 if ('valueRange' in attrs && !('isZoomedIgnoreProgrammaticZoom' in attrs)) {
758a629f 3355 this.zoomed_y_ = (attrs.valueRange !== null);
6a1aa64f 3356 }
450fe64b
DV
3357
3358 // TODO(danvk): validate per-series options.
46dde5f9
DV
3359 // Supported:
3360 // strokeWidth
3361 // pointSize
3362 // drawPoints
3363 // highlightCircleSize
450fe64b 3364
9ca829f2
DV
3365 // Check if this set options will require new points.
3366 var requiresNewPoints = Dygraph.isPixelChangingOptionList(this.attr_("labels"), attrs);
3367
48e614ac 3368 Dygraph.updateDeep(this.user_attrs_, attrs);
285a6bda 3369
48e614ac
DV
3370 if (file) {
3371 this.file_ = file;
ccfcc169 3372 if (!block_redraw) this.start_();
6a1aa64f 3373 } else {
9ca829f2
DV
3374 if (!block_redraw) {
3375 if (requiresNewPoints) {
48e614ac 3376 this.predraw_();
9ca829f2 3377 } else {
e2c21500 3378 this.renderGraph_(false);
9ca829f2
DV
3379 }
3380 }
6a1aa64f
DV
3381 }
3382};
3383
3384/**
48e614ac
DV
3385 * Returns a copy of the options with deprecated names converted into current
3386 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3387 * interested in that, they should save a copy before calling this.
3388 * @private
3389 */
3390Dygraph.mapLegacyOptions_ = function(attrs) {
3391 var my_attrs = {};
3392 for (var k in attrs) {
3393 if (k == 'file') continue;
3394 if (attrs.hasOwnProperty(k)) my_attrs[k] = attrs[k];
3395 }
3396
3397 var set = function(axis, opt, value) {
3398 if (!my_attrs.axes) my_attrs.axes = {};
3399 if (!my_attrs.axes[axis]) my_attrs.axes[axis] = {};
3400 my_attrs.axes[axis][opt] = value;
3401 };
3402 var map = function(opt, axis, new_opt) {
3403 if (typeof(attrs[opt]) != 'undefined') {
3404 set(axis, new_opt, attrs[opt]);
3405 delete my_attrs[opt];
3406 }
3407 };
3408
3409 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3410 map('xValueFormatter', 'x', 'valueFormatter');
3411 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3412 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3413 map('xTicker', 'x', 'ticker');
3414 map('yValueFormatter', 'y', 'valueFormatter');
3415 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3416 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3417 map('yTicker', 'y', 'ticker');
3418 return my_attrs;
3419};
3420
3421/**
697e70b2
DV
3422 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3423 * containing div (which has presumably changed size since the dygraph was
3424 * instantiated. If the width/height are specified, the div will be resized.
964f30c6
DV
3425 *
3426 * This is far more efficient than destroying and re-instantiating a
3427 * Dygraph, since it doesn't have to reparse the underlying data.
3428 *
629a09ae
DV
3429 * @param {Number} [width] Width (in pixels)
3430 * @param {Number} [height] Height (in pixels)
697e70b2
DV
3431 */
3432Dygraph.prototype.resize = function(width, height) {
e8c7ef86
DV
3433 if (this.resize_lock) {
3434 return;
3435 }
3436 this.resize_lock = true;
3437
697e70b2
DV
3438 if ((width === null) != (height === null)) {
3439 this.warn("Dygraph.resize() should be called with zero parameters or " +
3440 "two non-NULL parameters. Pretending it was zero.");
3441 width = height = null;
3442 }
3443
4b4d1a63
DV
3444 var old_width = this.width_;
3445 var old_height = this.height_;
b16e6369 3446
697e70b2
DV
3447 if (width) {
3448 this.maindiv_.style.width = width + "px";
3449 this.maindiv_.style.height = height + "px";
3450 this.width_ = width;
3451 this.height_ = height;
3452 } else {
ccd9d7c2
PF
3453 this.width_ = this.maindiv_.clientWidth;
3454 this.height_ = this.maindiv_.clientHeight;
697e70b2
DV
3455 }
3456
4b4d1a63
DV
3457 if (old_width != this.width_ || old_height != this.height_) {
3458 // TODO(danvk): there should be a clear() method.
3459 this.maindiv_.innerHTML = "";
77b5e09d 3460 this.roller_ = null;
4b4d1a63
DV
3461 this.attrs_.labelsDiv = null;
3462 this.createInterface_();
c9faeafd
DV
3463 if (this.annotations_.length) {
3464 // createInterface_ reset the layout, so we need to do this.
3465 this.layout_.setAnnotations(this.annotations_);
3466 }
4b4d1a63
DV
3467 this.predraw_();
3468 }
e8c7ef86
DV
3469
3470 this.resize_lock = false;
697e70b2
DV
3471};
3472
3473/**
6faebb69 3474 * Adjusts the number of points in the rolling average. Updates the graph to
6a1aa64f 3475 * reflect the new averaging period.
6faebb69 3476 * @param {Number} length Number of points over which to average the data.
6a1aa64f 3477 */
285a6bda 3478Dygraph.prototype.adjustRoll = function(length) {
6a1aa64f 3479 this.rollPeriod_ = length;
26ca7938 3480 this.predraw_();
6a1aa64f 3481};
540d00f1 3482
f8cfec73 3483/**
1cf11047
DV
3484 * Returns a boolean array of visibility statuses.
3485 */
3486Dygraph.prototype.visibility = function() {
3487 // Do lazy-initialization, so that this happens after we know the number of
3488 // data series.
3489 if (!this.attr_("visibility")) {
758a629f 3490 this.attrs_.visibility = [];
1cf11047 3491 }
758a629f 3492 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs.
395e98a3 3493 while (this.attr_("visibility").length < this.numColumns() - 1) {
758a629f 3494 this.attrs_.visibility.push(true);
1cf11047
DV
3495 }
3496 return this.attr_("visibility");
3497};
3498
3499/**
3500 * Changes the visiblity of a series.
3501 */
3502Dygraph.prototype.setVisibility = function(num, value) {
3503 var x = this.visibility();
a6c109c1 3504 if (num < 0 || num >= x.length) {
1cf11047
DV
3505 this.warn("invalid series number in setVisibility: " + num);
3506 } else {
3507 x[num] = value;
26ca7938 3508 this.predraw_();
1cf11047
DV
3509 }
3510};
3511
3512/**
0cb9bd91
DV
3513 * How large of an area will the dygraph render itself in?
3514 * This is used for testing.
3515 * @return A {width: w, height: h} object.
3516 * @private
3517 */
3518Dygraph.prototype.size = function() {
3519 return { width: this.width_, height: this.height_ };
3520};
3521
3522/**
5c528fa2 3523 * Update the list of annotations and redraw the chart.
41ee764f
DV
3524 * See dygraphs.com/annotations.html for more info on how to use annotations.
3525 * @param ann {Array} An array of annotation objects.
3526 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
5c528fa2 3527 */
a685723c 3528Dygraph.prototype.setAnnotations = function(ann, suppressDraw) {
3c51ab74
DV
3529 // Only add the annotation CSS rule once we know it will be used.
3530 Dygraph.addAnnotationRule();
5c528fa2
DV
3531 this.annotations_ = ann;
3532 this.layout_.setAnnotations(this.annotations_);
a685723c 3533 if (!suppressDraw) {
26ca7938 3534 this.predraw_();
a685723c 3535 }
5c528fa2
DV
3536};
3537
3538/**
3539 * Return the list of annotations.
3540 */
3541Dygraph.prototype.annotations = function() {
3542 return this.annotations_;
3543};
3544
46dde5f9 3545/**
82c6fe4d
KW
3546 * Get the list of label names for this graph. The first column is the
3547 * x-axis, so the data series names start at index 1.
3548 */
e2c21500 3549Dygraph.prototype.getLabels = function() {
82c6fe4d
KW
3550 return this.attr_("labels").slice();
3551};
3552
3553/**
46dde5f9
DV
3554 * Get the index of a series (column) given its name. The first column is the
3555 * x-axis, so the data series start with index 1.
3556 */
3557Dygraph.prototype.indexFromSetName = function(name) {
82c6fe4d 3558 return this.setIndexByName_[name];
46dde5f9
DV
3559};
3560
629a09ae 3561/**
857a6931
KW
3562 * Get the internal dataset index given its name. These are numbered starting from 0,
3563 * and only count visible sets.
3564 * @private
3565 */
3566Dygraph.prototype.datasetIndexFromSetName_ = function(name) {
3567 return this.datasetIndex_[this.indexFromSetName(name)];
3568};
3569
3570/**
629a09ae
DV
3571 * @private
3572 * Adds a default style for the annotation CSS classes to the document. This is
3573 * only executed when annotations are actually used. It is designed to only be
3574 * called once -- all calls after the first will return immediately.
3575 */
5c528fa2 3576Dygraph.addAnnotationRule = function() {
d38c6191 3577 // TODO(danvk): move this function into plugins/annotations.js?
5c528fa2
DV
3578 if (Dygraph.addedAnnotationCSS) return;
3579
5c528fa2
DV
3580 var rule = "border: 1px solid black; " +
3581 "background-color: white; " +
3582 "text-align: center;";
22186871
DV
3583
3584 var styleSheetElement = document.createElement("style");
3585 styleSheetElement.type = "text/css";
3586 document.getElementsByTagName("head")[0].appendChild(styleSheetElement);
3587
3588 // Find the first style sheet that we can access.
3589 // We may not add a rule to a style sheet from another domain for security
3590 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3591 // adds its own style sheets from google.com.
3592 for (var i = 0; i < document.styleSheets.length; i++) {
3593 if (document.styleSheets[i].disabled) continue;
3594 var mysheet = document.styleSheets[i];
3595 try {
3596 if (mysheet.insertRule) { // Firefox
3597 var idx = mysheet.cssRules ? mysheet.cssRules.length : 0;
3598 mysheet.insertRule(".dygraphDefaultAnnotation { " + rule + " }", idx);
3599 } else if (mysheet.addRule) { // IE
3600 mysheet.addRule(".dygraphDefaultAnnotation", rule);
3601 }
3602 Dygraph.addedAnnotationCSS = true;
3603 return;
3604 } catch(err) {
3605 // Was likely a security exception.
3606 }
5c528fa2
DV
3607 }
3608
22186871 3609 this.warn("Unable to add default annotation CSS rule; display may be off.");
758a629f 3610};
5c528fa2 3611
285a6bda 3612// Older pages may still use this name.
c0f54d4f 3613var DateGraph = Dygraph;