More direct browser version verification test for filtering FF3.5.
[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 */
c0f54d4f 64var Dygraph = function(div, data, opts) {
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65 if (arguments.length > 0) {
66 if (arguments.length == 4) {
67 // Old versions of dygraphs took in the series labels as a constructor
68 // parameter. This doesn't make sense anymore, but it's easy to continue
69 // to support this usage.
70 this.warn("Using deprecated four-argument dygraph constructor");
71 this.__old_init__(div, data, arguments[2], arguments[3]);
72 } else {
73 this.__init__(div, data, opts);
74 }
75 }
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76};
77
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78Dygraph.NAME = "Dygraph";
79Dygraph.VERSION = "1.2";
80Dygraph.__repr__ = function() {
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81 return "[" + this.NAME + " " + this.VERSION + "]";
82};
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83
84/**
85 * Returns information about the Dygraph class.
86 */
285a6bda 87Dygraph.toString = function() {
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88 return this.__repr__();
89};
90
91// Various default values
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92Dygraph.DEFAULT_ROLL_PERIOD = 1;
93Dygraph.DEFAULT_WIDTH = 480;
94Dygraph.DEFAULT_HEIGHT = 320;
6a1aa64f 95
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96Dygraph.ANIMATION_STEPS = 10;
97Dygraph.ANIMATION_DURATION = 200;
98
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99// These are defined before DEFAULT_ATTRS so that it can refer to them.
100/**
101 * @private
102 * Return a string version of a number. This respects the digitsAfterDecimal
103 * and maxNumberWidth options.
104 * @param {Number} x The number to be formatted
105 * @param {Dygraph} opts An options view
106 * @param {String} name The name of the point's data series
107 * @param {Dygraph} g The dygraph object
108 */
109Dygraph.numberValueFormatter = function(x, opts, pt, g) {
110 var sigFigs = opts('sigFigs');
111
112 if (sigFigs !== null) {
113 // User has opted for a fixed number of significant figures.
114 return Dygraph.floatFormat(x, sigFigs);
115 }
116
117 var digits = opts('digitsAfterDecimal');
118 var maxNumberWidth = opts('maxNumberWidth');
119
120 // switch to scientific notation if we underflow or overflow fixed display.
121 if (x !== 0.0 &&
122 (Math.abs(x) >= Math.pow(10, maxNumberWidth) ||
123 Math.abs(x) < Math.pow(10, -digits))) {
124 return x.toExponential(digits);
125 } else {
126 return '' + Dygraph.round_(x, digits);
127 }
128};
129
130/**
131 * variant for use as an axisLabelFormatter.
132 * @private
133 */
134Dygraph.numberAxisLabelFormatter = function(x, granularity, opts, g) {
135 return Dygraph.numberValueFormatter(x, opts, g);
136};
137
138/**
139 * Convert a JS date (millis since epoch) to YYYY/MM/DD
140 * @param {Number} date The JavaScript date (ms since epoch)
141 * @return {String} A date of the form "YYYY/MM/DD"
142 * @private
143 */
144Dygraph.dateString_ = function(date) {
145 var zeropad = Dygraph.zeropad;
146 var d = new Date(date);
147
148 // Get the year:
149 var year = "" + d.getFullYear();
150 // Get a 0 padded month string
151 var month = zeropad(d.getMonth() + 1); //months are 0-offset, sigh
152 // Get a 0 padded day string
153 var day = zeropad(d.getDate());
154
155 var ret = "";
156 var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds();
157 if (frac) ret = " " + Dygraph.hmsString_(date);
158
159 return year + "/" + month + "/" + day + ret;
160};
161
162/**
163 * Convert a JS date to a string appropriate to display on an axis that
164 * is displaying values at the stated granularity.
165 * @param {Date} date The date to format
166 * @param {Number} granularity One of the Dygraph granularity constants
167 * @return {String} The formatted date
168 * @private
169 */
170Dygraph.dateAxisFormatter = function(date, granularity) {
171 if (granularity >= Dygraph.DECADAL) {
172 return date.strftime('%Y');
173 } else if (granularity >= Dygraph.MONTHLY) {
174 return date.strftime('%b %y');
175 } else {
176 var frac = date.getHours() * 3600 + date.getMinutes() * 60 + date.getSeconds() + date.getMilliseconds();
758a629f 177 if (frac === 0 || granularity >= Dygraph.DAILY) {
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178 return new Date(date.getTime() + 3600*1000).strftime('%d%b');
179 } else {
180 return Dygraph.hmsString_(date.getTime());
181 }
182 }
183};
184
185
8e4a6af3 186// Default attribute values.
285a6bda 187Dygraph.DEFAULT_ATTRS = {
a9fc39ab 188 highlightCircleSize: 3,
285a6bda 189
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190 labelsDivWidth: 250,
191 labelsDivStyles: {
192 // TODO(danvk): move defaults from createStatusMessage_ here.
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193 },
194 labelsSeparateLines: false,
bcd3ebf0 195 labelsShowZeroValues: true,
285a6bda 196 labelsKMB: false,
afefbcdb 197 labelsKMG2: false,
d160cc3b 198 showLabelsOnHighlight: true,
12e4c741 199
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200 digitsAfterDecimal: 2,
201 maxNumberWidth: 6,
19589a3e 202 sigFigs: null,
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203
204 strokeWidth: 1.0,
8e4a6af3 205
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206 axisTickSize: 3,
207 axisLabelFontSize: 14,
208 xAxisLabelWidth: 50,
209 yAxisLabelWidth: 50,
210 rightGap: 5,
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211
212 showRoller: false,
285a6bda 213 xValueParser: Dygraph.dateParser,
285a6bda 214
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215 delimiter: ',',
216
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217 sigma: 2.0,
218 errorBars: false,
219 fractions: false,
220 wilsonInterval: true, // only relevant if fractions is true
5954ef32 221 customBars: false,
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222 fillGraph: false,
223 fillAlpha: 0.15,
f032c51d 224 connectSeparatedPoints: false,
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225
226 stackedGraph: false,
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227 hideOverlayOnMouseOut: true,
228
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229 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
230 legend: 'onmouseover', // the only relevant value at the moment is 'always'.
231
00c281d4 232 stepPlot: false,
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233 avoidMinZero: false,
234
ad1798c2 235 // Sizes of the various chart labels.
b4202b3d 236 titleHeight: 28,
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237 xLabelHeight: 18,
238 yLabelWidth: 18,
ad1798c2 239
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240 drawXAxis: true,
241 drawYAxis: true,
242 axisLineColor: "black",
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243 axisLineWidth: 0.3,
244 gridLineWidth: 0.3,
245 axisLabelColor: "black",
246 axisLabelFont: "Arial", // TODO(danvk): is this implemented?
247 axisLabelWidth: 50,
248 drawYGrid: true,
249 drawXGrid: true,
250 gridLineColor: "rgb(128,128,128)",
423f5ed3 251
48e614ac 252 interactionModel: null, // will be set to Dygraph.Interaction.defaultModel
b1a3b195 253 animatedZooms: false, // (for now)
48e614ac 254
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255 // Range selector options
256 showRangeSelector: false,
257 rangeSelectorHeight: 40,
258 rangeSelectorPlotStrokeColor: "#808FAB",
259 rangeSelectorPlotFillColor: "#A7B1C4",
260
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261 // per-axis options
262 axes: {
263 x: {
264 pixelsPerLabel: 60,
265 axisLabelFormatter: Dygraph.dateAxisFormatter,
266 valueFormatter: Dygraph.dateString_,
267 ticker: null // will be set in dygraph-tickers.js
268 },
269 y: {
270 pixelsPerLabel: 30,
271 valueFormatter: Dygraph.numberValueFormatter,
272 axisLabelFormatter: Dygraph.numberAxisLabelFormatter,
273 ticker: null // will be set in dygraph-tickers.js
274 },
275 y2: {
276 pixelsPerLabel: 30,
277 valueFormatter: Dygraph.numberValueFormatter,
278 axisLabelFormatter: Dygraph.numberAxisLabelFormatter,
279 ticker: null // will be set in dygraph-tickers.js
280 }
281 }
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282};
283
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284// Directions for panning and zooming. Use bit operations when combined
285// values are possible.
286Dygraph.HORIZONTAL = 1;
287Dygraph.VERTICAL = 2;
288
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289// Used for initializing annotation CSS rules only once.
290Dygraph.addedAnnotationCSS = false;
291
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292Dygraph.prototype.__old_init__ = function(div, file, labels, attrs) {
293 // Labels is no longer a constructor parameter, since it's typically set
294 // directly from the data source. It also conains a name for the x-axis,
295 // which the previous constructor form did not.
758a629f 296 if (labels !== null) {
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297 var new_labels = ["Date"];
298 for (var i = 0; i < labels.length; i++) new_labels.push(labels[i]);
fc80a396 299 Dygraph.update(attrs, { 'labels': new_labels });
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300 }
301 this.__init__(div, file, attrs);
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302};
303
6a1aa64f 304/**
285a6bda 305 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
7aedf6fe 306 * and context &lt;canvas&gt; inside of it. See the constructor for details.
6a1aa64f 307 * on the parameters.
12e4c741 308 * @param {Element} div the Element to render the graph into.
6a1aa64f 309 * @param {String | Function} file Source data
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310 * @param {Object} attrs Miscellaneous other options
311 * @private
312 */
285a6bda 313Dygraph.prototype.__init__ = function(div, file, attrs) {
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314 // Hack for IE: if we're using excanvas and the document hasn't finished
315 // loading yet (and hence may not have initialized whatever it needs to
316 // initialize), then keep calling this routine periodically until it has.
317 if (/MSIE/.test(navigator.userAgent) && !window.opera &&
318 typeof(G_vmlCanvasManager) != 'undefined' &&
319 document.readyState != 'complete') {
320 var self = this;
758a629f 321 setTimeout(function() { self.__init__(div, file, attrs); }, 100);
ccd9d7c2 322 return;
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323 }
324
285a6bda 325 // Support two-argument constructor
758a629f 326 if (attrs === null || attrs === undefined) { attrs = {}; }
285a6bda 327
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328 attrs = Dygraph.mapLegacyOptions_(attrs);
329
330 if (!div) {
331 Dygraph.error("Constructing dygraph with a non-existent div!");
332 return;
333 }
334
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335 this.isUsingExcanvas_ = typeof(G_vmlCanvasManager) != 'undefined';
336
6a1aa64f 337 // Copy the important bits into the object
32988383 338 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
6a1aa64f 339 this.maindiv_ = div;
6a1aa64f 340 this.file_ = file;
285a6bda 341 this.rollPeriod_ = attrs.rollPeriod || Dygraph.DEFAULT_ROLL_PERIOD;
6a1aa64f 342 this.previousVerticalX_ = -1;
6a1aa64f 343 this.fractions_ = attrs.fractions || false;
6a1aa64f 344 this.dateWindow_ = attrs.dateWindow || null;
8b83c6cc 345
fe0b7c03 346 this.is_initial_draw_ = true;
5c528fa2 347 this.annotations_ = [];
7aedf6fe 348
45f2c689 349 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
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350 this.zoomed_x_ = false;
351 this.zoomed_y_ = false;
45f2c689 352
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353 // Clear the div. This ensure that, if multiple dygraphs are passed the same
354 // div, then only one will be drawn.
355 div.innerHTML = "";
356
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357 // For historical reasons, the 'width' and 'height' options trump all CSS
358 // rules _except_ for an explicit 'width' or 'height' on the div.
359 // As an added convenience, if the div has zero height (like <div></div> does
360 // without any styles), then we use a default height/width.
758a629f 361 if (div.style.width === '' && attrs.width) {
0cb9bd91 362 div.style.width = attrs.width + "px";
285a6bda 363 }
758a629f 364 if (div.style.height === '' && attrs.height) {
0cb9bd91 365 div.style.height = attrs.height + "px";
32988383 366 }
758a629f 367 if (div.style.height === '' && div.clientHeight === 0) {
0cb9bd91 368 div.style.height = Dygraph.DEFAULT_HEIGHT + "px";
758a629f 369 if (div.style.width === '') {
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370 div.style.width = Dygraph.DEFAULT_WIDTH + "px";
371 }
c21d2c2d 372 }
fffad740 373 // these will be zero if the dygraph's div is hidden.
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374 this.width_ = div.clientWidth;
375 this.height_ = div.clientHeight;
32988383 376
344ba8c0 377 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
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378 if (attrs.stackedGraph) {
379 attrs.fillGraph = true;
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380 // TODO(nikhilk): Add any other stackedGraph checks here.
381 }
382
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383 // Dygraphs has many options, some of which interact with one another.
384 // To keep track of everything, we maintain two sets of options:
385 //
c21d2c2d 386 // this.user_attrs_ only options explicitly set by the user.
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387 // this.attrs_ defaults, options derived from user_attrs_, data.
388 //
389 // Options are then accessed this.attr_('attr'), which first looks at
390 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
391 // defaults without overriding behavior that the user specifically asks for.
392 this.user_attrs_ = {};
fc80a396 393 Dygraph.update(this.user_attrs_, attrs);
6a1aa64f 394
48e614ac 395 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
285a6bda 396 this.attrs_ = {};
48e614ac 397 Dygraph.updateDeep(this.attrs_, Dygraph.DEFAULT_ATTRS);
6a1aa64f 398
16269f6e 399 this.boundaryIds_ = [];
6a1aa64f 400
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401 // Create the containing DIV and other interactive elements
402 this.createInterface_();
403
738fc797 404 this.start_();
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405};
406
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407/**
408 * Returns the zoomed status of the chart for one or both axes.
409 *
410 * Axis is an optional parameter. Can be set to 'x' or 'y'.
411 *
412 * The zoomed status for an axis is set whenever a user zooms using the mouse
e5152598 413 * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom
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414 * option is also specified).
415 */
57baab03 416Dygraph.prototype.isZoomed = function(axis) {
94ea5744 417 if (axis == null) return this.zoomed_x_ || this.zoomed_y_;
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418 if (axis === 'x') return this.zoomed_x_;
419 if (axis === 'y') return this.zoomed_y_;
94ea5744 420 throw "axis parameter is [" + axis + "] must be null, 'x' or 'y'.";
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421};
422
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423/**
424 * Returns information about the Dygraph object, including its containing ID.
425 */
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426Dygraph.prototype.toString = function() {
427 var maindiv = this.maindiv_;
758a629f 428 var id = (maindiv && maindiv.id) ? maindiv.id : maindiv;
22bd1dfb 429 return "[Dygraph " + id + "]";
758a629f 430};
22bd1dfb 431
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432/**
433 * @private
434 * Returns the value of an option. This may be set by the user (either in the
435 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
436 * per-series value.
437 * @param { String } name The name of the option, e.g. 'rollPeriod'.
438 * @param { String } [seriesName] The name of the series to which the option
439 * will be applied. If no per-series value of this option is available, then
440 * the global value is returned. This is optional.
441 * @return { ... } The value of the option.
442 */
227b93cc 443Dygraph.prototype.attr_ = function(name, seriesName) {
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444// <REMOVE_FOR_COMBINED>
445 if (typeof(Dygraph.OPTIONS_REFERENCE) === 'undefined') {
446 this.error('Must include options reference JS for testing');
447 } else if (!Dygraph.OPTIONS_REFERENCE.hasOwnProperty(name)) {
448 this.error('Dygraphs is using property ' + name + ', which has no entry ' +
449 'in the Dygraphs.OPTIONS_REFERENCE listing.');
450 // Only log this error once.
451 Dygraph.OPTIONS_REFERENCE[name] = true;
452 }
453// </REMOVE_FOR_COMBINED>
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454 if (seriesName &&
455 typeof(this.user_attrs_[seriesName]) != 'undefined' &&
758a629f 456 this.user_attrs_[seriesName] !== null &&
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457 typeof(this.user_attrs_[seriesName][name]) != 'undefined') {
458 return this.user_attrs_[seriesName][name];
450fe64b 459 } else if (typeof(this.user_attrs_[name]) != 'undefined') {
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460 return this.user_attrs_[name];
461 } else if (typeof(this.attrs_[name]) != 'undefined') {
462 return this.attrs_[name];
463 } else {
464 return null;
465 }
466};
467
6a1aa64f 468/**
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469 * @private
470 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
471 * @return { ... } A function mapping string -> option value
472 */
473Dygraph.prototype.optionsViewForAxis_ = function(axis) {
474 var self = this;
475 return function(opt) {
758a629f 476 var axis_opts = self.user_attrs_.axes;
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477 if (axis_opts && axis_opts[axis] && axis_opts[axis][opt]) {
478 return axis_opts[axis][opt];
479 }
480 // user-specified attributes always trump defaults, even if they're less
481 // specific.
482 if (typeof(self.user_attrs_[opt]) != 'undefined') {
483 return self.user_attrs_[opt];
484 }
485
758a629f 486 axis_opts = self.attrs_.axes;
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487 if (axis_opts && axis_opts[axis] && axis_opts[axis][opt]) {
488 return axis_opts[axis][opt];
489 }
490 // check old-style axis options
491 // TODO(danvk): add a deprecation warning if either of these match.
492 if (axis == 'y' && self.axes_[0].hasOwnProperty(opt)) {
493 return self.axes_[0][opt];
494 } else if (axis == 'y2' && self.axes_[1].hasOwnProperty(opt)) {
495 return self.axes_[1][opt];
496 }
497 return self.attr_(opt);
498 };
499};
500
501/**
6a1aa64f 502 * Returns the current rolling period, as set by the user or an option.
6faebb69 503 * @return {Number} The number of points in the rolling window
6a1aa64f 504 */
285a6bda 505Dygraph.prototype.rollPeriod = function() {
6a1aa64f 506 return this.rollPeriod_;
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507};
508
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509/**
510 * Returns the currently-visible x-range. This can be affected by zooming,
511 * panning or a call to updateOptions.
512 * Returns a two-element array: [left, right].
513 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
514 */
515Dygraph.prototype.xAxisRange = function() {
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516 return this.dateWindow_ ? this.dateWindow_ : this.xAxisExtremes();
517};
599fb4ad 518
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519/**
520 * Returns the lower- and upper-bound x-axis values of the
521 * data set.
522 */
523Dygraph.prototype.xAxisExtremes = function() {
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524 var left = this.rawData_[0][0];
525 var right = this.rawData_[this.rawData_.length - 1][0];
526 return [left, right];
527};
528
3230c662 529/**
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530 * Returns the currently-visible y-range for an axis. This can be affected by
531 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
532 * called with no arguments, returns the range of the first axis.
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533 * Returns a two-element array: [bottom, top].
534 */
d58ae307 535Dygraph.prototype.yAxisRange = function(idx) {
d63e6799 536 if (typeof(idx) == "undefined") idx = 0;
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537 if (idx < 0 || idx >= this.axes_.length) {
538 return null;
539 }
540 var axis = this.axes_[idx];
541 return [ axis.computedValueRange[0], axis.computedValueRange[1] ];
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542};
543
544/**
545 * Returns the currently-visible y-ranges for each axis. This can be affected by
546 * zooming, panning, calls to updateOptions, etc.
547 * Returns an array of [bottom, top] pairs, one for each y-axis.
548 */
549Dygraph.prototype.yAxisRanges = function() {
550 var ret = [];
551 for (var i = 0; i < this.axes_.length; i++) {
552 ret.push(this.yAxisRange(i));
553 }
554 return ret;
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555};
556
d58ae307 557// TODO(danvk): use these functions throughout dygraphs.
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558/**
559 * Convert from data coordinates to canvas/div X/Y coordinates.
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560 * If specified, do this conversion for the coordinate system of a particular
561 * axis. Uses the first axis by default.
3230c662 562 * Returns a two-element array: [X, Y]
ff022deb 563 *
0747928a 564 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
ff022deb 565 * instead of toDomCoords(null, y, axis).
3230c662 566 */
d58ae307 567Dygraph.prototype.toDomCoords = function(x, y, axis) {
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568 return [ this.toDomXCoord(x), this.toDomYCoord(y, axis) ];
569};
570
571/**
572 * Convert from data x coordinates to canvas/div X coordinate.
573 * If specified, do this conversion for the coordinate system of a particular
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574 * axis.
575 * Returns a single value or null if x is null.
ff022deb
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576 */
577Dygraph.prototype.toDomXCoord = function(x) {
758a629f 578 if (x === null) {
ff022deb 579 return null;
758a629f 580 }
ff022deb 581
3230c662 582 var area = this.plotter_.area;
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583 var xRange = this.xAxisRange();
584 return area.x + (x - xRange[0]) / (xRange[1] - xRange[0]) * area.w;
758a629f 585};
3230c662 586
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587/**
588 * Convert from data x coordinates to canvas/div Y coordinate and optional
589 * axis. Uses the first axis by default.
590 *
591 * returns a single value or null if y is null.
592 */
593Dygraph.prototype.toDomYCoord = function(y, axis) {
0747928a 594 var pct = this.toPercentYCoord(y, axis);
3230c662 595
758a629f 596 if (pct === null) {
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597 return null;
598 }
e4416fb9 599 var area = this.plotter_.area;
ff022deb 600 return area.y + pct * area.h;
758a629f 601};
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602
603/**
604 * Convert from canvas/div coords to data coordinates.
d58ae307
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605 * If specified, do this conversion for the coordinate system of a particular
606 * axis. Uses the first axis by default.
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607 * Returns a two-element array: [X, Y].
608 *
0747928a 609 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
ff022deb 610 * instead of toDataCoords(null, y, axis).
3230c662 611 */
d58ae307 612Dygraph.prototype.toDataCoords = function(x, y, axis) {
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613 return [ this.toDataXCoord(x), this.toDataYCoord(y, axis) ];
614};
615
616/**
617 * Convert from canvas/div x coordinate to data coordinate.
618 *
619 * If x is null, this returns null.
620 */
621Dygraph.prototype.toDataXCoord = function(x) {
758a629f 622 if (x === null) {
ff022deb 623 return null;
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624 }
625
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626 var area = this.plotter_.area;
627 var xRange = this.xAxisRange();
628 return xRange[0] + (x - area.x) / area.w * (xRange[1] - xRange[0]);
629};
630
631/**
632 * Convert from canvas/div y coord to value.
633 *
634 * If y is null, this returns null.
635 * if axis is null, this uses the first axis.
636 */
637Dygraph.prototype.toDataYCoord = function(y, axis) {
758a629f 638 if (y === null) {
ff022deb 639 return null;
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640 }
641
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642 var area = this.plotter_.area;
643 var yRange = this.yAxisRange(axis);
644
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645 if (typeof(axis) == "undefined") axis = 0;
646 if (!this.axes_[axis].logscale) {
d9816e62 647 return yRange[0] + (area.y + area.h - y) / area.h * (yRange[1] - yRange[0]);
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648 } else {
649 // Computing the inverse of toDomCoord.
758a629f 650 var pct = (y - area.y) / area.h;
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651
652 // Computing the inverse of toPercentYCoord. The function was arrived at with
653 // the following steps:
654 //
655 // Original calcuation:
d59b6f34 656 // pct = (logr1 - Dygraph.log10(y)) / (logr1 - Dygraph.log10(yRange[0]));
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657 //
658 // Move denominator to both sides:
d59b6f34 659 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
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660 //
661 // subtract logr1, and take the negative value.
d59b6f34 662 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
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663 //
664 // Swap both sides of the equation, and we can compute the log of the
665 // return value. Which means we just need to use that as the exponent in
666 // e^exponent.
d59b6f34 667 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
ff022deb 668
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669 var logr1 = Dygraph.log10(yRange[1]);
670 var exponent = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
671 var value = Math.pow(Dygraph.LOG_SCALE, exponent);
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672 return value;
673 }
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674};
675
e99fde05 676/**
ff022deb 677 * Converts a y for an axis to a percentage from the top to the
4cac8c7a 678 * bottom of the drawing area.
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679 *
680 * If the coordinate represents a value visible on the canvas, then
681 * the value will be between 0 and 1, where 0 is the top of the canvas.
682 * However, this method will return values outside the range, as
683 * values can fall outside the canvas.
684 *
685 * If y is null, this returns null.
686 * if axis is null, this uses the first axis.
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687 *
688 * @param { Number } y The data y-coordinate.
689 * @param { Number } [axis] The axis number on which the data coordinate lives.
690 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
ff022deb
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691 */
692Dygraph.prototype.toPercentYCoord = function(y, axis) {
758a629f 693 if (y === null) {
ff022deb
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694 return null;
695 }
7d0e7a0d 696 if (typeof(axis) == "undefined") axis = 0;
ff022deb 697
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698 var yRange = this.yAxisRange(axis);
699
700 var pct;
7d0e7a0d 701 if (!this.axes_[axis].logscale) {
4cac8c7a
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702 // yRange[1] - y is unit distance from the bottom.
703 // yRange[1] - yRange[0] is the scale of the range.
ff022deb
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704 // (yRange[1] - y) / (yRange[1] - yRange[0]) is the % from the bottom.
705 pct = (yRange[1] - y) / (yRange[1] - yRange[0]);
706 } else {
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707 var logr1 = Dygraph.log10(yRange[1]);
708 pct = (logr1 - Dygraph.log10(y)) / (logr1 - Dygraph.log10(yRange[0]));
ff022deb
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709 }
710 return pct;
758a629f 711};
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712
713/**
4cac8c7a
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714 * Converts an x value to a percentage from the left to the right of
715 * the drawing area.
716 *
717 * If the coordinate represents a value visible on the canvas, then
718 * the value will be between 0 and 1, where 0 is the left of the canvas.
719 * However, this method will return values outside the range, as
720 * values can fall outside the canvas.
721 *
722 * If x is null, this returns null.
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723 * @param { Number } x The data x-coordinate.
724 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
4cac8c7a
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725 */
726Dygraph.prototype.toPercentXCoord = function(x) {
758a629f 727 if (x === null) {
4cac8c7a
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728 return null;
729 }
730
4cac8c7a 731 var xRange = this.xAxisRange();
965a030e 732 return (x - xRange[0]) / (xRange[1] - xRange[0]);
629a09ae 733};
4cac8c7a
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734
735/**
e99fde05 736 * Returns the number of columns (including the independent variable).
629a09ae 737 * @return { Integer } The number of columns.
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738 */
739Dygraph.prototype.numColumns = function() {
395e98a3 740 return this.rawData_[0] ? this.rawData_[0].length : this.attr_("labels").length;
e99fde05
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741};
742
743/**
744 * Returns the number of rows (excluding any header/label row).
629a09ae 745 * @return { Integer } The number of rows, less any header.
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746 */
747Dygraph.prototype.numRows = function() {
748 return this.rawData_.length;
749};
750
751/**
395e98a3
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752 * Returns the full range of the x-axis, as determined by the most extreme
753 * values in the data set. Not affected by zooming, visibility, etc.
769e8bc7 754 * TODO(danvk): merge w/ xAxisExtremes
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755 * @return { Array<Number> } A [low, high] pair
756 * @private
757 */
758Dygraph.prototype.fullXRange_ = function() {
759 if (this.numRows() > 0) {
760 return [this.rawData_[0][0], this.rawData_[this.numRows() - 1][0]];
761 } else {
762 return [0, 1];
763 }
758a629f 764};
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765
766/**
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767 * Returns the value in the given row and column. If the row and column exceed
768 * the bounds on the data, returns null. Also returns null if the value is
769 * missing.
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770 * @param { Number} row The row number of the data (0-based). Row 0 is the
771 * first row of data, not a header row.
772 * @param { Number} col The column number of the data (0-based)
773 * @return { Number } The value in the specified cell or null if the row/col
774 * were out of range.
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775 */
776Dygraph.prototype.getValue = function(row, col) {
777 if (row < 0 || row > this.rawData_.length) return null;
778 if (col < 0 || col > this.rawData_[row].length) return null;
779
780 return this.rawData_[row][col];
781};
782
629a09ae 783/**
285a6bda 784 * Generates interface elements for the Dygraph: a containing div, a div to
6a1aa64f 785 * display the current point, and a textbox to adjust the rolling average
697e70b2 786 * period. Also creates the Renderer/Layout elements.
6a1aa64f
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787 * @private
788 */
285a6bda 789Dygraph.prototype.createInterface_ = function() {
6a1aa64f
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790 // Create the all-enclosing graph div
791 var enclosing = this.maindiv_;
792
b0c3b730
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793 this.graphDiv = document.createElement("div");
794 this.graphDiv.style.width = this.width_ + "px";
795 this.graphDiv.style.height = this.height_ + "px";
796 enclosing.appendChild(this.graphDiv);
797
798 // Create the canvas for interactive parts of the chart.
f8cfec73 799 this.canvas_ = Dygraph.createCanvas();
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800 this.canvas_.style.position = "absolute";
801 this.canvas_.width = this.width_;
802 this.canvas_.height = this.height_;
f8cfec73
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803 this.canvas_.style.width = this.width_ + "px"; // for IE
804 this.canvas_.style.height = this.height_ + "px"; // for IE
b0c3b730 805
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806 this.canvas_ctx_ = Dygraph.getContext(this.canvas_);
807
b0c3b730 808 // ... and for static parts of the chart.
6a1aa64f 809 this.hidden_ = this.createPlotKitCanvas_(this.canvas_);
2cf95fff 810 this.hidden_ctx_ = Dygraph.getContext(this.hidden_);
76171648 811
ccd9d7c2
PF
812 if (this.attr_('showRangeSelector')) {
813 // The range selector must be created here so that its canvases and contexts get created here.
814 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
815 // The range selector also sets xAxisHeight in order to reserve space.
816 this.rangeSelector_ = new DygraphRangeSelector(this);
817 }
818
eb7bf005
EC
819 // The interactive parts of the graph are drawn on top of the chart.
820 this.graphDiv.appendChild(this.hidden_);
821 this.graphDiv.appendChild(this.canvas_);
920208fb
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822 this.mouseEventElement_ = this.createMouseEventElement_();
823
824 // Create the grapher
825 this.layout_ = new DygraphLayout(this);
826
827 if (this.rangeSelector_) {
828 // This needs to happen after the graph canvases are added to the div and the layout object is created.
829 this.rangeSelector_.addToGraph(this.graphDiv, this.layout_);
830 }
eb7bf005 831
76171648 832 var dygraph = this;
eb7bf005 833 Dygraph.addEvent(this.mouseEventElement_, 'mousemove', function(e) {
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834 dygraph.mouseMove_(e);
835 });
eb7bf005 836 Dygraph.addEvent(this.mouseEventElement_, 'mouseout', function(e) {
76171648
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837 dygraph.mouseOut_(e);
838 });
697e70b2 839
697e70b2 840 this.createStatusMessage_();
697e70b2 841 this.createDragInterface_();
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842
843 // Update when the window is resized.
844 // TODO(danvk): drop frames depending on complexity of the chart.
845 Dygraph.addEvent(window, 'resize', function(e) {
846 dygraph.resize();
847 });
4cfcc38c
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848};
849
850/**
851 * Detach DOM elements in the dygraph and null out all data references.
852 * Calling this when you're done with a dygraph can dramatically reduce memory
853 * usage. See, e.g., the tests/perf.html example.
854 */
855Dygraph.prototype.destroy = function() {
856 var removeRecursive = function(node) {
857 while (node.hasChildNodes()) {
858 removeRecursive(node.firstChild);
859 node.removeChild(node.firstChild);
860 }
861 };
862 removeRecursive(this.maindiv_);
863
864 var nullOut = function(obj) {
865 for (var n in obj) {
866 if (typeof(obj[n]) === 'object') {
867 obj[n] = null;
868 }
869 }
870 };
871
872 // These may not all be necessary, but it can't hurt...
873 nullOut(this.layout_);
874 nullOut(this.plotter_);
875 nullOut(this);
876};
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877
878/**
629a09ae
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879 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
880 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
881 * or the zoom rectangles) is done on this.canvas_.
8846615a 882 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
6a1aa64f
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883 * @return {Object} The newly-created canvas
884 * @private
885 */
285a6bda 886Dygraph.prototype.createPlotKitCanvas_ = function(canvas) {
f8cfec73 887 var h = Dygraph.createCanvas();
6a1aa64f 888 h.style.position = "absolute";
9ac5e4ae
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889 // TODO(danvk): h should be offset from canvas. canvas needs to include
890 // some extra area to make it easier to zoom in on the far left and far
891 // right. h needs to be precisely the plot area, so that clipping occurs.
6a1aa64f
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892 h.style.top = canvas.style.top;
893 h.style.left = canvas.style.left;
894 h.width = this.width_;
895 h.height = this.height_;
f8cfec73
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896 h.style.width = this.width_ + "px"; // for IE
897 h.style.height = this.height_ + "px"; // for IE
6a1aa64f
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898 return h;
899};
900
629a09ae 901/**
920208fb
PF
902 * Creates an overlay element used to handle mouse events.
903 * @return {Object} The mouse event element.
904 * @private
905 */
906Dygraph.prototype.createMouseEventElement_ = function() {
907 if (this.isUsingExcanvas_) {
908 var elem = document.createElement("div");
909 elem.style.position = 'absolute';
910 elem.style.backgroundColor = 'white';
911 elem.style.filter = 'alpha(opacity=0)';
912 elem.style.width = this.width_ + "px";
913 elem.style.height = this.height_ + "px";
914 this.graphDiv.appendChild(elem);
915 return elem;
916 } else {
917 return this.canvas_;
918 }
919};
920
921/**
6a1aa64f
DV
922 * Generate a set of distinct colors for the data series. This is done with a
923 * color wheel. Saturation/Value are customizable, and the hue is
924 * equally-spaced around the color wheel. If a custom set of colors is
925 * specified, that is used instead.
6a1aa64f
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926 * @private
927 */
285a6bda 928Dygraph.prototype.setColors_ = function() {
285a6bda 929 var num = this.attr_("labels").length - 1;
6a1aa64f 930 this.colors_ = [];
285a6bda 931 var colors = this.attr_('colors');
758a629f 932 var i;
285a6bda
DV
933 if (!colors) {
934 var sat = this.attr_('colorSaturation') || 1.0;
935 var val = this.attr_('colorValue') || 0.5;
2aa21213 936 var half = Math.ceil(num / 2);
758a629f 937 for (i = 1; i <= num; i++) {
ec1959eb 938 if (!this.visibility()[i-1]) continue;
43af96e7 939 // alternate colors for high contrast.
2aa21213 940 var idx = i % 2 ? Math.ceil(i / 2) : (half + i / 2);
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941 var hue = (1.0 * idx/ (1 + num));
942 this.colors_.push(Dygraph.hsvToRGB(hue, sat, val));
6a1aa64f
DV
943 }
944 } else {
758a629f 945 for (i = 0; i < num; i++) {
ec1959eb 946 if (!this.visibility()[i]) continue;
285a6bda 947 var colorStr = colors[i % colors.length];
f474c2a3 948 this.colors_.push(colorStr);
6a1aa64f
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949 }
950 }
600d841a
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951
952 this.plotter_.setColors(this.colors_);
629a09ae 953};
6a1aa64f 954
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955/**
956 * Return the list of colors. This is either the list of colors passed in the
629a09ae 957 * attributes or the autogenerated list of rgb(r,g,b) strings.
43af96e7
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958 * @return {Array<string>} The list of colors.
959 */
960Dygraph.prototype.getColors = function() {
961 return this.colors_;
962};
963
6a1aa64f
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964/**
965 * Create the div that contains information on the selected point(s)
966 * This goes in the top right of the canvas, unless an external div has already
967 * been specified.
968 * @private
969 */
fedbd797 970Dygraph.prototype.createStatusMessage_ = function() {
758a629f
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971 var userLabelsDiv = this.user_attrs_.labelsDiv;
972 if (userLabelsDiv && null !== userLabelsDiv &&
973 (typeof(userLabelsDiv) == "string" || userLabelsDiv instanceof String)) {
974 this.user_attrs_.labelsDiv = document.getElementById(userLabelsDiv);
fedbd797 975 }
285a6bda
DV
976 if (!this.attr_("labelsDiv")) {
977 var divWidth = this.attr_('labelsDivWidth');
b0c3b730 978 var messagestyle = {
6a1aa64f
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979 "position": "absolute",
980 "fontSize": "14px",
981 "zIndex": 10,
982 "width": divWidth + "px",
983 "top": "0px",
8846615a 984 "left": (this.width_ - divWidth - 2) + "px",
6a1aa64f
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985 "background": "white",
986 "textAlign": "left",
b0c3b730 987 "overflow": "hidden"};
fc80a396 988 Dygraph.update(messagestyle, this.attr_('labelsDivStyles'));
b0c3b730 989 var div = document.createElement("div");
02d8dc64 990 div.className = "dygraph-legend";
b0c3b730 991 for (var name in messagestyle) {
85b99f0b
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992 if (messagestyle.hasOwnProperty(name)) {
993 div.style[name] = messagestyle[name];
994 }
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995 }
996 this.graphDiv.appendChild(div);
285a6bda 997 this.attrs_.labelsDiv = div;
6a1aa64f
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998 }
999};
1000
1001/**
ad1798c2
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1002 * Position the labels div so that:
1003 * - its right edge is flush with the right edge of the charting area
1004 * - its top edge is flush with the top edge of the charting area
629a09ae 1005 * @private
0abfbd7e
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1006 */
1007Dygraph.prototype.positionLabelsDiv_ = function() {
1008 // Don't touch a user-specified labelsDiv.
1009 if (this.user_attrs_.hasOwnProperty("labelsDiv")) return;
1010
1011 var area = this.plotter_.area;
1012 var div = this.attr_("labelsDiv");
8c21adcf 1013 div.style.left = area.x + area.w - this.attr_("labelsDivWidth") - 1 + "px";
ad1798c2 1014 div.style.top = area.y + "px";
0abfbd7e
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1015};
1016
1017/**
6a1aa64f 1018 * Create the text box to adjust the averaging period
6a1aa64f
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1019 * @private
1020 */
285a6bda 1021Dygraph.prototype.createRollInterface_ = function() {
8c69de65
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1022 // Create a roller if one doesn't exist already.
1023 if (!this.roller_) {
1024 this.roller_ = document.createElement("input");
1025 this.roller_.type = "text";
1026 this.roller_.style.display = "none";
1027 this.graphDiv.appendChild(this.roller_);
1028 }
1029
1030 var display = this.attr_('showRoller') ? 'block' : 'none';
26ca7938 1031
0c38f187 1032 var area = this.plotter_.area;
b0c3b730
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1033 var textAttr = { "position": "absolute",
1034 "zIndex": 10,
0c38f187
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1035 "top": (area.y + area.h - 25) + "px",
1036 "left": (area.x + 1) + "px",
b0c3b730 1037 "display": display
6a1aa64f 1038 };
8c69de65
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1039 this.roller_.size = "2";
1040 this.roller_.value = this.rollPeriod_;
b0c3b730 1041 for (var name in textAttr) {
85b99f0b 1042 if (textAttr.hasOwnProperty(name)) {
8c69de65 1043 this.roller_.style[name] = textAttr[name];
85b99f0b 1044 }
b0c3b730
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1045 }
1046
76171648 1047 var dygraph = this;
8c69de65 1048 this.roller_.onchange = function() { dygraph.adjustRoll(dygraph.roller_.value); };
76171648
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1049};
1050
629a09ae
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1051/**
1052 * @private
629a09ae
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1053 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1054 * canvas (i.e. DOM Coords).
1055 */
062ef401 1056Dygraph.prototype.dragGetX_ = function(e, context) {
758a629f 1057 return Dygraph.pageX(e) - context.px;
062ef401 1058};
bce01b0f 1059
629a09ae
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1060/**
1061 * @private
1062 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1063 * canvas (i.e. DOM Coords).
1064 */
062ef401 1065Dygraph.prototype.dragGetY_ = function(e, context) {
758a629f 1066 return Dygraph.pageY(e) - context.py;
062ef401 1067};
ee672584 1068
629a09ae 1069/**
062ef401
JB
1070 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1071 * events.
1072 * @private
1073 */
1074Dygraph.prototype.createDragInterface_ = function() {
1075 var context = {
1076 // Tracks whether the mouse is down right now
1077 isZooming: false,
1078 isPanning: false, // is this drag part of a pan?
1079 is2DPan: false, // if so, is that pan 1- or 2-dimensional?
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1080 dragStartX: null, // pixel coordinates
1081 dragStartY: null, // pixel coordinates
1082 dragEndX: null, // pixel coordinates
1083 dragEndY: null, // pixel coordinates
062ef401 1084 dragDirection: null,
8442269f
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1085 prevEndX: null, // pixel coordinates
1086 prevEndY: null, // pixel coordinates
062ef401
JB
1087 prevDragDirection: null,
1088
ec291cbe
RK
1089 // The value on the left side of the graph when a pan operation starts.
1090 initialLeftmostDate: null,
1091
1092 // The number of units each pixel spans. (This won't be valid for log
1093 // scales)
1094 xUnitsPerPixel: null,
062ef401
JB
1095
1096 // TODO(danvk): update this comment
1097 // The range in second/value units that the viewport encompasses during a
1098 // panning operation.
1099 dateRange: null,
1100
8442269f
RK
1101 // Top-left corner of the canvas, in DOM coords
1102 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
062ef401
JB
1103 px: 0,
1104 py: 0,
1105
965a030e 1106 // Values for use with panEdgeFraction, which limit how far outside the
4cac8c7a
RK
1107 // graph's data boundaries it can be panned.
1108 boundedDates: null, // [minDate, maxDate]
1109 boundedValues: null, // [[minValue, maxValue] ...]
1110
062ef401
JB
1111 initializeMouseDown: function(event, g, context) {
1112 // prevents mouse drags from selecting page text.
1113 if (event.preventDefault) {
1114 event.preventDefault(); // Firefox, Chrome, etc.
6a1aa64f 1115 } else {
062ef401
JB
1116 event.returnValue = false; // IE
1117 event.cancelBubble = true;
6a1aa64f
DV
1118 }
1119
062ef401
JB
1120 context.px = Dygraph.findPosX(g.canvas_);
1121 context.py = Dygraph.findPosY(g.canvas_);
1122 context.dragStartX = g.dragGetX_(event, context);
1123 context.dragStartY = g.dragGetY_(event, context);
6a1aa64f 1124 }
062ef401 1125 };
2b188b3d 1126
062ef401 1127 var interactionModel = this.attr_("interactionModel");
8b83c6cc 1128
062ef401
JB
1129 // Self is the graph.
1130 var self = this;
6faebb69 1131
062ef401
JB
1132 // Function that binds the graph and context to the handler.
1133 var bindHandler = function(handler) {
1134 return function(event) {
1135 handler(event, self, context);
1136 };
1137 };
1138
1139 for (var eventName in interactionModel) {
1140 if (!interactionModel.hasOwnProperty(eventName)) continue;
1141 Dygraph.addEvent(this.mouseEventElement_, eventName,
1142 bindHandler(interactionModel[eventName]));
1143 }
1144
1145 // If the user releases the mouse button during a drag, but not over the
1146 // canvas, then it doesn't count as a zooming action.
1147 Dygraph.addEvent(document, 'mouseup', function(event) {
1148 if (context.isZooming || context.isPanning) {
1149 context.isZooming = false;
1150 context.dragStartX = null;
1151 context.dragStartY = null;
1152 }
1153
1154 if (context.isPanning) {
1155 context.isPanning = false;
1156 context.draggingDate = null;
1157 context.dateRange = null;
1158 for (var i = 0; i < self.axes_.length; i++) {
1159 delete self.axes_[i].draggingValue;
1160 delete self.axes_[i].dragValueRange;
1161 }
1162 }
6a1aa64f
DV
1163 });
1164};
1165
1166/**
1167 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1168 * up any previous zoom rectangles that were drawn. This could be optimized to
1169 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1170 * dots.
ccd9d7c2 1171 *
39b0e098
RK
1172 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1173 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
6a1aa64f
DV
1174 * @param {Number} startX The X position where the drag started, in canvas
1175 * coordinates.
1176 * @param {Number} endX The current X position of the drag, in canvas coords.
8b83c6cc
RK
1177 * @param {Number} startY The Y position where the drag started, in canvas
1178 * coordinates.
1179 * @param {Number} endY The current Y position of the drag, in canvas coords.
39b0e098 1180 * @param {Number} prevDirection the value of direction on the previous call to
8b83c6cc 1181 * this function. Used to avoid excess redrawing
6a1aa64f
DV
1182 * @param {Number} prevEndX The value of endX on the previous call to this
1183 * function. Used to avoid excess redrawing
8b83c6cc
RK
1184 * @param {Number} prevEndY The value of endY on the previous call to this
1185 * function. Used to avoid excess redrawing
6a1aa64f
DV
1186 * @private
1187 */
7201b11e
JB
1188Dygraph.prototype.drawZoomRect_ = function(direction, startX, endX, startY,
1189 endY, prevDirection, prevEndX,
1190 prevEndY) {
2cf95fff 1191 var ctx = this.canvas_ctx_;
6a1aa64f
DV
1192
1193 // Clean up from the previous rect if necessary
39b0e098 1194 if (prevDirection == Dygraph.HORIZONTAL) {
fa54c193
FXB
1195 ctx.clearRect(Math.min(startX, prevEndX), this.layout_.getPlotArea().y,
1196 Math.abs(startX - prevEndX), this.layout_.getPlotArea().h);
39b0e098 1197 } else if (prevDirection == Dygraph.VERTICAL){
fa54c193
FXB
1198 ctx.clearRect(this.layout_.getPlotArea().x, Math.min(startY, prevEndY),
1199 this.layout_.getPlotArea().w, Math.abs(startY - prevEndY));
6a1aa64f
DV
1200 }
1201
1202 // Draw a light-grey rectangle to show the new viewing area
39b0e098 1203 if (direction == Dygraph.HORIZONTAL) {
8b83c6cc
RK
1204 if (endX && startX) {
1205 ctx.fillStyle = "rgba(128,128,128,0.33)";
fa54c193
FXB
1206 ctx.fillRect(Math.min(startX, endX), this.layout_.getPlotArea().y,
1207 Math.abs(endX - startX), this.layout_.getPlotArea().h);
8b83c6cc 1208 }
920208fb 1209 } else if (direction == Dygraph.VERTICAL) {
8b83c6cc
RK
1210 if (endY && startY) {
1211 ctx.fillStyle = "rgba(128,128,128,0.33)";
fa54c193
FXB
1212 ctx.fillRect(this.layout_.getPlotArea().x, Math.min(startY, endY),
1213 this.layout_.getPlotArea().w, Math.abs(endY - startY));
8b83c6cc 1214 }
6a1aa64f 1215 }
920208fb
PF
1216
1217 if (this.isUsingExcanvas_) {
1218 this.currentZoomRectArgs_ = [direction, startX, endX, startY, endY, 0, 0, 0];
1219 }
1220};
1221
1222/**
1223 * Clear the zoom rectangle (and perform no zoom).
1224 * @private
1225 */
1226Dygraph.prototype.clearZoomRect_ = function() {
1227 this.currentZoomRectArgs_ = null;
1228 this.canvas_ctx_.clearRect(0, 0, this.canvas_.width, this.canvas_.height);
6a1aa64f
DV
1229};
1230
1231/**
8b83c6cc
RK
1232 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1233 * the canvas. The exact zoom window may be slightly larger if there are no data
1234 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1235 * which accepts dates that match the raw data. This function redraws the graph.
d58ae307 1236 *
6a1aa64f
DV
1237 * @param {Number} lowX The leftmost pixel value that should be visible.
1238 * @param {Number} highX The rightmost pixel value that should be visible.
1239 * @private
1240 */
8b83c6cc 1241Dygraph.prototype.doZoomX_ = function(lowX, highX) {
920208fb 1242 this.currentZoomRectArgs_ = null;
6a1aa64f 1243 // Find the earliest and latest dates contained in this canvasx range.
8b83c6cc 1244 // Convert the call to date ranges of the raw data.
ff022deb
RK
1245 var minDate = this.toDataXCoord(lowX);
1246 var maxDate = this.toDataXCoord(highX);
8b83c6cc
RK
1247 this.doZoomXDates_(minDate, maxDate);
1248};
6a1aa64f 1249
8b83c6cc 1250/**
b1a3b195
DV
1251 * Transition function to use in animations. Returns values between 0.0
1252 * (totally old values) and 1.0 (totally new values) for each frame.
1253 * @private
1254 */
1255Dygraph.zoomAnimationFunction = function(frame, numFrames) {
1256 var k = 1.5;
1257 return (1.0 - Math.pow(k, -frame)) / (1.0 - Math.pow(k, -numFrames));
1258};
1259
1260/**
8b83c6cc
RK
1261 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1262 * method with doZoomX which accepts pixel coordinates. This function redraws
1263 * the graph.
d58ae307 1264 *
8b83c6cc
RK
1265 * @param {Number} minDate The minimum date that should be visible.
1266 * @param {Number} maxDate The maximum date that should be visible.
1267 * @private
1268 */
1269Dygraph.prototype.doZoomXDates_ = function(minDate, maxDate) {
b1a3b195
DV
1270 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1271 // can produce strange effects. Rather than the y-axis transitioning slowly
1272 // between values, it can jerk around.)
1273 var old_window = this.xAxisRange();
1274 var new_window = [minDate, maxDate];
57baab03 1275 this.zoomed_x_ = true;
b1a3b195
DV
1276 var that = this;
1277 this.doAnimatedZoom(old_window, new_window, null, null, function() {
1278 if (that.attr_("zoomCallback")) {
1279 that.attr_("zoomCallback")(minDate, maxDate, that.yAxisRanges());
1280 }
1281 });
8b83c6cc
RK
1282};
1283
1284/**
1285 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
d58ae307
DV
1286 * the canvas. This function redraws the graph.
1287 *
8b83c6cc
RK
1288 * @param {Number} lowY The topmost pixel value that should be visible.
1289 * @param {Number} highY The lowest pixel value that should be visible.
1290 * @private
1291 */
1292Dygraph.prototype.doZoomY_ = function(lowY, highY) {
920208fb 1293 this.currentZoomRectArgs_ = null;
d58ae307
DV
1294 // Find the highest and lowest values in pixel range for each axis.
1295 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1296 // This is because pixels increase as you go down on the screen, whereas data
1297 // coordinates increase as you go up the screen.
b1a3b195
DV
1298 var oldValueRanges = this.yAxisRanges();
1299 var newValueRanges = [];
d58ae307 1300 for (var i = 0; i < this.axes_.length; i++) {
ff022deb
RK
1301 var hi = this.toDataYCoord(lowY, i);
1302 var low = this.toDataYCoord(highY, i);
b1a3b195 1303 newValueRanges.push([low, hi]);
d58ae307 1304 }
8b83c6cc 1305
57baab03 1306 this.zoomed_y_ = true;
b1a3b195
DV
1307 var that = this;
1308 this.doAnimatedZoom(null, null, oldValueRanges, newValueRanges, function() {
1309 if (that.attr_("zoomCallback")) {
1310 var xRange = that.xAxisRange();
b1a3b195
DV
1311 that.attr_("zoomCallback")(xRange[0], xRange[1], that.yAxisRanges());
1312 }
1313 });
8b83c6cc
RK
1314};
1315
1316/**
1317 * Reset the zoom to the original view coordinates. This is the same as
1318 * double-clicking on the graph.
d58ae307 1319 *
8b83c6cc
RK
1320 * @private
1321 */
1322Dygraph.prototype.doUnzoom_ = function() {
b1a3b195 1323 var dirty = false, dirtyX = false, dirtyY = false;
758a629f 1324 if (this.dateWindow_ !== null) {
d58ae307 1325 dirty = true;
b1a3b195 1326 dirtyX = true;
8b83c6cc 1327 }
d58ae307
DV
1328
1329 for (var i = 0; i < this.axes_.length; i++) {
758a629f 1330 if (this.axes_[i].valueWindow !== null) {
d58ae307 1331 dirty = true;
b1a3b195 1332 dirtyY = true;
d58ae307 1333 }
8b83c6cc
RK
1334 }
1335
da1369a5
DV
1336 // Clear any selection, since it's likely to be drawn in the wrong place.
1337 this.clearSelection();
1338
8b83c6cc 1339 if (dirty) {
57baab03
NN
1340 this.zoomed_x_ = false;
1341 this.zoomed_y_ = false;
b1a3b195
DV
1342
1343 var minDate = this.rawData_[0][0];
1344 var maxDate = this.rawData_[this.rawData_.length - 1][0];
1345
1346 // With only one frame, don't bother calculating extreme ranges.
1347 // TODO(danvk): merge this block w/ the code below.
1348 if (!this.attr_("animatedZooms")) {
1349 this.dateWindow_ = null;
758a629f
DV
1350 for (i = 0; i < this.axes_.length; i++) {
1351 if (this.axes_[i].valueWindow !== null) {
b1a3b195
DV
1352 delete this.axes_[i].valueWindow;
1353 }
1354 }
1355 this.drawGraph_();
1356 if (this.attr_("zoomCallback")) {
1357 this.attr_("zoomCallback")(minDate, maxDate, this.yAxisRanges());
1358 }
1359 return;
1360 }
1361
1362 var oldWindow=null, newWindow=null, oldValueRanges=null, newValueRanges=null;
1363 if (dirtyX) {
1364 oldWindow = this.xAxisRange();
1365 newWindow = [minDate, maxDate];
1366 }
1367
1368 if (dirtyY) {
1369 oldValueRanges = this.yAxisRanges();
1370 // TODO(danvk): this is pretty inefficient
1371 var packed = this.gatherDatasets_(this.rolledSeries_, null);
1372 var extremes = packed[1];
1373
1374 // this has the side-effect of modifying this.axes_.
1375 // this doesn't make much sense in this context, but it's convenient (we
1376 // need this.axes_[*].extremeValues) and not harmful since we'll be
1377 // calling drawGraph_ shortly, which clobbers these values.
1378 this.computeYAxisRanges_(extremes);
1379
1380 newValueRanges = [];
758a629f 1381 for (i = 0; i < this.axes_.length; i++) {
b1a3b195
DV
1382 newValueRanges.push(this.axes_[i].extremeRange);
1383 }
1384 }
1385
1386 var that = this;
1387 this.doAnimatedZoom(oldWindow, newWindow, oldValueRanges, newValueRanges,
1388 function() {
1389 that.dateWindow_ = null;
1390 for (var i = 0; i < that.axes_.length; i++) {
758a629f 1391 if (that.axes_[i].valueWindow !== null) {
b1a3b195
DV
1392 delete that.axes_[i].valueWindow;
1393 }
1394 }
1395 if (that.attr_("zoomCallback")) {
1396 that.attr_("zoomCallback")(minDate, maxDate, that.yAxisRanges());
1397 }
1398 });
1399 }
1400};
1401
1402/**
1403 * Combined animation logic for all zoom functions.
1404 * either the x parameters or y parameters may be null.
1405 * @private
1406 */
1407Dygraph.prototype.doAnimatedZoom = function(oldXRange, newXRange, oldYRanges, newYRanges, callback) {
1408 var steps = this.attr_("animatedZooms") ? Dygraph.ANIMATION_STEPS : 1;
1409
1410 var windows = [];
1411 var valueRanges = [];
758a629f 1412 var step, frac;
b1a3b195 1413
758a629f
DV
1414 if (oldXRange !== null && newXRange !== null) {
1415 for (step = 1; step <= steps; step++) {
1416 frac = Dygraph.zoomAnimationFunction(step, steps);
b1a3b195
DV
1417 windows[step-1] = [oldXRange[0]*(1-frac) + frac*newXRange[0],
1418 oldXRange[1]*(1-frac) + frac*newXRange[1]];
8b83c6cc 1419 }
67e650dc 1420 }
b1a3b195 1421
758a629f
DV
1422 if (oldYRanges !== null && newYRanges !== null) {
1423 for (step = 1; step <= steps; step++) {
1424 frac = Dygraph.zoomAnimationFunction(step, steps);
b1a3b195
DV
1425 var thisRange = [];
1426 for (var j = 0; j < this.axes_.length; j++) {
1427 thisRange.push([oldYRanges[j][0]*(1-frac) + frac*newYRanges[j][0],
1428 oldYRanges[j][1]*(1-frac) + frac*newYRanges[j][1]]);
1429 }
1430 valueRanges[step-1] = thisRange;
1431 }
1432 }
1433
1434 var that = this;
1435 Dygraph.repeatAndCleanup(function(step) {
1436 if (valueRanges.length) {
1437 for (var i = 0; i < that.axes_.length; i++) {
1438 var w = valueRanges[step][i];
1439 that.axes_[i].valueWindow = [w[0], w[1]];
1440 }
1441 }
1442 if (windows.length) {
1443 that.dateWindow_ = windows[step];
1444 }
1445 that.drawGraph_();
1446 }, steps, Dygraph.ANIMATION_DURATION / steps, callback);
6a1aa64f
DV
1447};
1448
1449/**
1450 * When the mouse moves in the canvas, display information about a nearby data
1451 * point and draw dots over those points in the data series. This function
1452 * takes care of cleanup of previously-drawn dots.
1453 * @param {Object} event The mousemove event from the browser.
1454 * @private
1455 */
285a6bda 1456Dygraph.prototype.mouseMove_ = function(event) {
e863a17d 1457 // This prevents JS errors when mousing over the canvas before data loads.
4cac8c7a 1458 var points = this.layout_.points;
685ebbb3 1459 if (points === undefined) return;
e863a17d 1460
4cac8c7a
RK
1461 var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(this.mouseEventElement_);
1462
6a1aa64f 1463 var lastx = -1;
758a629f 1464 var i;
6a1aa64f
DV
1465
1466 // Loop through all the points and find the date nearest to our current
1467 // location.
1468 var minDist = 1e+100;
1469 var idx = -1;
758a629f 1470 for (i = 0; i < points.length; i++) {
8a7cc60e 1471 var point = points[i];
758a629f 1472 if (point === null) continue;
062ef401 1473 var dist = Math.abs(point.canvasx - canvasx);
f032c51d 1474 if (dist > minDist) continue;
6a1aa64f
DV
1475 minDist = dist;
1476 idx = i;
1477 }
1478 if (idx >= 0) lastx = points[idx].xval;
6a1aa64f
DV
1479
1480 // Extract the points we've selected
b258a3da 1481 this.selPoints_ = [];
50360fd0 1482 var l = points.length;
416b05ad 1483 if (!this.attr_("stackedGraph")) {
758a629f 1484 for (i = 0; i < l; i++) {
416b05ad
NK
1485 if (points[i].xval == lastx) {
1486 this.selPoints_.push(points[i]);
1487 }
1488 }
1489 } else {
354e15ab
DE
1490 // Need to 'unstack' points starting from the bottom
1491 var cumulative_sum = 0;
758a629f 1492 for (i = l - 1; i >= 0; i--) {
416b05ad 1493 if (points[i].xval == lastx) {
354e15ab 1494 var p = {}; // Clone the point since we modify it
d4139cd8
NK
1495 for (var k in points[i]) {
1496 p[k] = points[i][k];
50360fd0
NK
1497 }
1498 p.yval -= cumulative_sum;
1499 cumulative_sum += p.yval;
d4139cd8 1500 this.selPoints_.push(p);
12e4c741 1501 }
6a1aa64f 1502 }
354e15ab 1503 this.selPoints_.reverse();
6a1aa64f
DV
1504 }
1505
b258a3da 1506 if (this.attr_("highlightCallback")) {
a4c6a67c 1507 var px = this.lastx_;
dd082dda 1508 if (px !== null && lastx != px) {
344ba8c0 1509 // only fire if the selected point has changed.
2ddb1197 1510 this.attr_("highlightCallback")(event, lastx, this.selPoints_, this.idxToRow_(idx));
43af96e7 1511 }
12e4c741 1512 }
43af96e7 1513
239c712d
NAG
1514 // Save last x position for callbacks.
1515 this.lastx_ = lastx;
50360fd0 1516
239c712d
NAG
1517 this.updateSelection_();
1518};
b258a3da 1519
239c712d 1520/**
1903f1e4 1521 * Transforms layout_.points index into data row number.
2ddb1197 1522 * @param int layout_.points index
1903f1e4 1523 * @return int row number, or -1 if none could be found.
2ddb1197
SC
1524 * @private
1525 */
1526Dygraph.prototype.idxToRow_ = function(idx) {
1903f1e4 1527 if (idx < 0) return -1;
2ddb1197 1528
1903f1e4
DV
1529 for (var i in this.layout_.datasets) {
1530 if (idx < this.layout_.datasets[i].length) {
1531 return this.boundaryIds_[0][0]+idx;
1532 }
1533 idx -= this.layout_.datasets[i].length;
1534 }
1535 return -1;
1536};
2ddb1197 1537
629a09ae
DV
1538/**
1539 * @private
629a09ae
DV
1540 * Generates HTML for the legend which is displayed when hovering over the
1541 * chart. If no selected points are specified, a default legend is returned
1542 * (this may just be the empty string).
1543 * @param { Number } [x] The x-value of the selected points.
1544 * @param { [Object] } [sel_points] List of selected points for the given
1545 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1546 */
e9fe4a2f 1547Dygraph.prototype.generateLegendHTML_ = function(x, sel_points) {
2fccd3dc
DV
1548 // If no points are selected, we display a default legend. Traditionally,
1549 // this has been blank. But a better default would be a conventional legend,
1550 // which provides essential information for a non-interactive chart.
758a629f 1551 var html, sepLines, i, c;
2fccd3dc
DV
1552 if (typeof(x) === 'undefined') {
1553 if (this.attr_('legend') != 'always') return '';
1554
758a629f 1555 sepLines = this.attr_('labelsSeparateLines');
2fccd3dc 1556 var labels = this.attr_('labels');
758a629f
DV
1557 html = '';
1558 for (i = 1; i < labels.length; i++) {
352c8310 1559 if (!this.visibility()[i - 1]) continue;
758a629f
DV
1560 c = this.plotter_.colors[labels[i]];
1561 if (html !== '') html += (sepLines ? '<br/>' : ' ');
bafe040e
DV
1562 html += "<b><span style='color: " + c + ";'>&mdash;" + labels[i] +
1563 "</span></b>";
2fccd3dc
DV
1564 }
1565 return html;
1566 }
1567
48e614ac
DV
1568 var xOptView = this.optionsViewForAxis_('x');
1569 var xvf = xOptView('valueFormatter');
758a629f 1570 html = xvf(x, xOptView, this.attr_('labels')[0], this) + ":";
e9fe4a2f 1571
48e614ac
DV
1572 var yOptViews = [];
1573 var num_axes = this.numAxes();
758a629f 1574 for (i = 0; i < num_axes; i++) {
48e614ac
DV
1575 yOptViews[i] = this.optionsViewForAxis_('y' + (i ? 1 + i : ''));
1576 }
e9fe4a2f 1577 var showZeros = this.attr_("labelsShowZeroValues");
758a629f
DV
1578 sepLines = this.attr_("labelsSeparateLines");
1579 for (i = 0; i < this.selPoints_.length; i++) {
e9fe4a2f 1580 var pt = this.selPoints_[i];
758a629f 1581 if (pt.yval === 0 && !showZeros) continue;
e9fe4a2f
DV
1582 if (!Dygraph.isOK(pt.canvasy)) continue;
1583 if (sepLines) html += "<br/>";
1584
48e614ac
DV
1585 var yOptView = yOptViews[this.seriesToAxisMap_[pt.name]];
1586 var fmtFunc = yOptView('valueFormatter');
758a629f 1587 c = this.plotter_.colors[pt.name];
48e614ac
DV
1588 var yval = fmtFunc(pt.yval, yOptView, pt.name, this);
1589
2fccd3dc 1590 // TODO(danvk): use a template string here and make it an attribute.
758a629f
DV
1591 html += " <b><span style='color: " + c + ";'>" + pt.name +
1592 "</span></b>:" + yval;
e9fe4a2f
DV
1593 }
1594 return html;
1595};
1596
629a09ae
DV
1597/**
1598 * @private
1599 * Displays information about the selected points in the legend. If there is no
1600 * selection, the legend will be cleared.
1601 * @param { Number } [x] The x-value of the selected points.
1602 * @param { [Object] } [sel_points] List of selected points for the given
1603 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1604 */
91c10d9c
DV
1605Dygraph.prototype.setLegendHTML_ = function(x, sel_points) {
1606 var html = this.generateLegendHTML_(x, sel_points);
1607 var labelsDiv = this.attr_("labelsDiv");
1608 if (labelsDiv !== null) {
1609 labelsDiv.innerHTML = html;
1610 } else {
1611 if (typeof(this.shown_legend_error_) == 'undefined') {
1612 this.error('labelsDiv is set to something nonexistent; legend will not be shown.');
1613 this.shown_legend_error_ = true;
1614 }
1615 }
1616};
1617
2ddb1197 1618/**
239c712d
NAG
1619 * Draw dots over the selectied points in the data series. This function
1620 * takes care of cleanup of previously-drawn dots.
1621 * @private
1622 */
1623Dygraph.prototype.updateSelection_ = function() {
6a1aa64f 1624 // Clear the previously drawn vertical, if there is one
758a629f 1625 var i;
2cf95fff 1626 var ctx = this.canvas_ctx_;
6a1aa64f 1627 if (this.previousVerticalX_ >= 0) {
46dde5f9
DV
1628 // Determine the maximum highlight circle size.
1629 var maxCircleSize = 0;
227b93cc 1630 var labels = this.attr_('labels');
758a629f 1631 for (i = 1; i < labels.length; i++) {
227b93cc 1632 var r = this.attr_('highlightCircleSize', labels[i]);
46dde5f9
DV
1633 if (r > maxCircleSize) maxCircleSize = r;
1634 }
6a1aa64f 1635 var px = this.previousVerticalX_;
46dde5f9
DV
1636 ctx.clearRect(px - maxCircleSize - 1, 0,
1637 2 * maxCircleSize + 2, this.height_);
6a1aa64f
DV
1638 }
1639
920208fb
PF
1640 if (this.isUsingExcanvas_ && this.currentZoomRectArgs_) {
1641 Dygraph.prototype.drawZoomRect_.apply(this, this.currentZoomRectArgs_);
1642 }
1643
d160cc3b 1644 if (this.selPoints_.length > 0) {
6a1aa64f 1645 // Set the status message to indicate the selected point(s)
d160cc3b 1646 if (this.attr_('showLabelsOnHighlight')) {
91c10d9c 1647 this.setLegendHTML_(this.lastx_, this.selPoints_);
6a1aa64f 1648 }
6a1aa64f 1649
6a1aa64f 1650 // Draw colored circles over the center of each selected point
e9fe4a2f 1651 var canvasx = this.selPoints_[0].canvasx;
43af96e7 1652 ctx.save();
758a629f 1653 for (i = 0; i < this.selPoints_.length; i++) {
e9fe4a2f
DV
1654 var pt = this.selPoints_[i];
1655 if (!Dygraph.isOK(pt.canvasy)) continue;
1656
1657 var circleSize = this.attr_('highlightCircleSize', pt.name);
6a1aa64f 1658 ctx.beginPath();
e9fe4a2f
DV
1659 ctx.fillStyle = this.plotter_.colors[pt.name];
1660 ctx.arc(canvasx, pt.canvasy, circleSize, 0, 2 * Math.PI, false);
6a1aa64f
DV
1661 ctx.fill();
1662 }
1663 ctx.restore();
1664
1665 this.previousVerticalX_ = canvasx;
1666 }
1667};
1668
1669/**
629a09ae
DV
1670 * Manually set the selected points and display information about them in the
1671 * legend. The selection can be cleared using clearSelection() and queried
1672 * using getSelection().
1673 * @param { Integer } row number that should be highlighted (i.e. appear with
1674 * hover dots on the chart). Set to false to clear any selection.
239c712d
NAG
1675 */
1676Dygraph.prototype.setSelection = function(row) {
1677 // Extract the points we've selected
1678 this.selPoints_ = [];
1679 var pos = 0;
50360fd0 1680
239c712d 1681 if (row !== false) {
b1a3b195 1682 row = row - this.boundaryIds_[0][0];
16269f6e 1683 }
50360fd0 1684
16269f6e 1685 if (row !== false && row >= 0) {
239c712d 1686 for (var i in this.layout_.datasets) {
16269f6e 1687 if (row < this.layout_.datasets[i].length) {
38f33a44 1688 var point = this.layout_.points[pos+row];
ccd9d7c2 1689
38f33a44 1690 if (this.attr_("stackedGraph")) {
8c03ba63 1691 point = this.layout_.unstackPointAtIndex(pos+row);
38f33a44 1692 }
ccd9d7c2 1693
38f33a44 1694 this.selPoints_.push(point);
16269f6e 1695 }
239c712d
NAG
1696 pos += this.layout_.datasets[i].length;
1697 }
16269f6e 1698 }
50360fd0 1699
16269f6e 1700 if (this.selPoints_.length) {
239c712d
NAG
1701 this.lastx_ = this.selPoints_[0].xval;
1702 this.updateSelection_();
1703 } else {
239c712d
NAG
1704 this.clearSelection();
1705 }
1706
1707};
1708
1709/**
6a1aa64f
DV
1710 * The mouse has left the canvas. Clear out whatever artifacts remain
1711 * @param {Object} event the mouseout event from the browser.
1712 * @private
1713 */
285a6bda 1714Dygraph.prototype.mouseOut_ = function(event) {
a4c6a67c
AV
1715 if (this.attr_("unhighlightCallback")) {
1716 this.attr_("unhighlightCallback")(event);
1717 }
1718
43af96e7 1719 if (this.attr_("hideOverlayOnMouseOut")) {
239c712d 1720 this.clearSelection();
43af96e7 1721 }
6a1aa64f
DV
1722};
1723
239c712d 1724/**
629a09ae
DV
1725 * Clears the current selection (i.e. points that were highlighted by moving
1726 * the mouse over the chart).
239c712d
NAG
1727 */
1728Dygraph.prototype.clearSelection = function() {
1729 // Get rid of the overlay data
2cf95fff 1730 this.canvas_ctx_.clearRect(0, 0, this.width_, this.height_);
91c10d9c 1731 this.setLegendHTML_();
239c712d
NAG
1732 this.selPoints_ = [];
1733 this.lastx_ = -1;
758a629f 1734};
239c712d 1735
103b7292 1736/**
629a09ae
DV
1737 * Returns the number of the currently selected row. To get data for this row,
1738 * you can use the getValue method.
1739 * @return { Integer } row number, or -1 if nothing is selected
103b7292
NAG
1740 */
1741Dygraph.prototype.getSelection = function() {
1742 if (!this.selPoints_ || this.selPoints_.length < 1) {
1743 return -1;
1744 }
50360fd0 1745
103b7292
NAG
1746 for (var row=0; row<this.layout_.points.length; row++ ) {
1747 if (this.layout_.points[row].x == this.selPoints_[0].x) {
16269f6e 1748 return row + this.boundaryIds_[0][0];
103b7292
NAG
1749 }
1750 }
1751 return -1;
2e1fcf1a 1752};
103b7292 1753
19589a3e 1754/**
6a1aa64f
DV
1755 * Fires when there's data available to be graphed.
1756 * @param {String} data Raw CSV data to be plotted
1757 * @private
1758 */
285a6bda 1759Dygraph.prototype.loadedEvent_ = function(data) {
6a1aa64f 1760 this.rawData_ = this.parseCSV_(data);
26ca7938 1761 this.predraw_();
6a1aa64f
DV
1762};
1763
6a1aa64f
DV
1764/**
1765 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1766 * @private
1767 */
285a6bda 1768Dygraph.prototype.addXTicks_ = function() {
6a1aa64f 1769 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
7201b11e 1770 var range;
6a1aa64f 1771 if (this.dateWindow_) {
7201b11e 1772 range = [this.dateWindow_[0], this.dateWindow_[1]];
6a1aa64f 1773 } else {
395e98a3 1774 range = this.fullXRange_();
7201b11e
JB
1775 }
1776
48e614ac
DV
1777 var xAxisOptionsView = this.optionsViewForAxis_('x');
1778 var xTicks = xAxisOptionsView('ticker')(
1779 range[0],
1780 range[1],
1781 this.width_, // TODO(danvk): should be area.width
1782 xAxisOptionsView,
1783 this);
1784 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
1785 // console.log(msg);
b2c9222a 1786 this.layout_.setXTicks(xTicks);
32988383
DV
1787};
1788
629a09ae
DV
1789/**
1790 * @private
1791 * Computes the range of the data series (including confidence intervals).
1792 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
1793 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1794 * @return [low, high]
1795 */
5011e7a1 1796Dygraph.prototype.extremeValues_ = function(series) {
758a629f 1797 var minY = null, maxY = null, j, y;
5011e7a1 1798
9922b78b 1799 var bars = this.attr_("errorBars") || this.attr_("customBars");
5011e7a1
DV
1800 if (bars) {
1801 // With custom bars, maxY is the max of the high values.
758a629f
DV
1802 for (j = 0; j < series.length; j++) {
1803 y = series[j][1][0];
5011e7a1
DV
1804 if (!y) continue;
1805 var low = y - series[j][1][1];
1806 var high = y + series[j][1][2];
1807 if (low > y) low = y; // this can happen with custom bars,
1808 if (high < y) high = y; // e.g. in tests/custom-bars.html
758a629f 1809 if (maxY === null || high > maxY) {
5011e7a1
DV
1810 maxY = high;
1811 }
758a629f 1812 if (minY === null || low < minY) {
5011e7a1
DV
1813 minY = low;
1814 }
1815 }
1816 } else {
758a629f
DV
1817 for (j = 0; j < series.length; j++) {
1818 y = series[j][1];
d12999d3 1819 if (y === null || isNaN(y)) continue;
758a629f 1820 if (maxY === null || y > maxY) {
5011e7a1
DV
1821 maxY = y;
1822 }
758a629f 1823 if (minY === null || y < minY) {
5011e7a1
DV
1824 minY = y;
1825 }
1826 }
1827 }
1828
1829 return [minY, maxY];
1830};
1831
6a1aa64f 1832/**
629a09ae 1833 * @private
26ca7938
DV
1834 * This function is called once when the chart's data is changed or the options
1835 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1836 * idea is that values derived from the chart's data can be computed here,
1837 * rather than every time the chart is drawn. This includes things like the
1838 * number of axes, rolling averages, etc.
1839 */
1840Dygraph.prototype.predraw_ = function() {
7153e001
DV
1841 var start = new Date();
1842
26ca7938
DV
1843 // TODO(danvk): move more computations out of drawGraph_ and into here.
1844 this.computeYAxes_();
1845
1846 // Create a new plotter.
70c80071 1847 if (this.plotter_) this.plotter_.clear();
26ca7938 1848 this.plotter_ = new DygraphCanvasRenderer(this,
2cf95fff
RK
1849 this.hidden_,
1850 this.hidden_ctx_,
0e23cfc6 1851 this.layout_);
26ca7938 1852
0abfbd7e
DV
1853 // The roller sits in the bottom left corner of the chart. We don't know where
1854 // this will be until the options are available, so it's positioned here.
8c69de65 1855 this.createRollInterface_();
26ca7938 1856
0abfbd7e
DV
1857 // Same thing applies for the labelsDiv. It's right edge should be flush with
1858 // the right edge of the charting area (which may not be the same as the right
1859 // edge of the div, if we have two y-axes.
1860 this.positionLabelsDiv_();
1861
ccd9d7c2
PF
1862 if (this.rangeSelector_) {
1863 this.rangeSelector_.renderStaticLayer();
1864 }
1865
b1a3b195
DV
1866 // Convert the raw data (a 2D array) into the internal format and compute
1867 // rolling averages.
1868 this.rolledSeries_ = [null]; // x-axis is the first series and it's special
395e98a3 1869 for (var i = 1; i < this.numColumns(); i++) {
b1a3b195
DV
1870 var connectSeparatedPoints = this.attr_('connectSeparatedPoints', i);
1871 var logScale = this.attr_('logscale', i);
1872 var series = this.extractSeries_(this.rawData_, i, logScale, connectSeparatedPoints);
1873 series = this.rollingAverage(series, this.rollPeriod_);
1874 this.rolledSeries_.push(series);
1875 }
1876
26ca7938
DV
1877 // If the data or options have changed, then we'd better redraw.
1878 this.drawGraph_();
4b4d1a63
DV
1879
1880 // This is used to determine whether to do various animations.
1881 var end = new Date();
1882 this.drawingTimeMs_ = (end - start);
26ca7938
DV
1883};
1884
1885/**
b1a3b195
DV
1886 * Loop over all fields and create datasets, calculating extreme y-values for
1887 * each series and extreme x-indices as we go.
fc4e84fa 1888 *
b1a3b195
DV
1889 * dateWindow is passed in as an explicit parameter so that we can compute
1890 * extreme values "speculatively", i.e. without actually setting state on the
1891 * dygraph.
fc4e84fa 1892 *
b1a3b195
DV
1893 * TODO(danvk): make this more of a true function
1894 * @return [ datasets, seriesExtremes, boundaryIds ]
6a1aa64f
DV
1895 * @private
1896 */
b1a3b195
DV
1897Dygraph.prototype.gatherDatasets_ = function(rolledSeries, dateWindow) {
1898 var boundaryIds = [];
354e15ab
DE
1899 var cumulative_y = []; // For stacked series.
1900 var datasets = [];
f09fc545 1901 var extremes = {}; // series name -> [low, high]
758a629f 1902 var i, j, k;
f09fc545 1903
b1a3b195
DV
1904 // Loop over the fields (series). Go from the last to the first,
1905 // because if they're stacked that's how we accumulate the values.
1906 var num_series = rolledSeries.length - 1;
758a629f 1907 for (i = num_series; i >= 1; i--) {
1cf11047
DV
1908 if (!this.visibility()[i - 1]) continue;
1909
b1a3b195 1910 // TODO(danvk): is this copy really necessary?
6a1aa64f 1911 var series = [];
758a629f 1912 for (j = 0; j < rolledSeries[i].length; j++) {
b1a3b195 1913 series.push(rolledSeries[i][j]);
6a1aa64f 1914 }
2f5e7e1a 1915
6a1aa64f 1916 // Prune down to the desired range, if necessary (for zooming)
1a26f3fb
DV
1917 // Because there can be lines going to points outside of the visible area,
1918 // we actually prune to visible points, plus one on either side.
9922b78b 1919 var bars = this.attr_("errorBars") || this.attr_("customBars");
b1a3b195
DV
1920 if (dateWindow) {
1921 var low = dateWindow[0];
1922 var high = dateWindow[1];
6a1aa64f 1923 var pruned = [];
1a26f3fb
DV
1924 // TODO(danvk): do binary search instead of linear search.
1925 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1926 var firstIdx = null, lastIdx = null;
758a629f 1927 for (k = 0; k < series.length; k++) {
1a26f3fb
DV
1928 if (series[k][0] >= low && firstIdx === null) {
1929 firstIdx = k;
1930 }
1931 if (series[k][0] <= high) {
1932 lastIdx = k;
6a1aa64f
DV
1933 }
1934 }
1a26f3fb
DV
1935 if (firstIdx === null) firstIdx = 0;
1936 if (firstIdx > 0) firstIdx--;
1937 if (lastIdx === null) lastIdx = series.length - 1;
1938 if (lastIdx < series.length - 1) lastIdx++;
b1a3b195 1939 boundaryIds[i-1] = [firstIdx, lastIdx];
758a629f 1940 for (k = firstIdx; k <= lastIdx; k++) {
1a26f3fb 1941 pruned.push(series[k]);
6a1aa64f
DV
1942 }
1943 series = pruned;
16269f6e 1944 } else {
b1a3b195 1945 boundaryIds[i-1] = [0, series.length-1];
6a1aa64f
DV
1946 }
1947
f09fc545 1948 var seriesExtremes = this.extremeValues_(series);
5011e7a1 1949
6a1aa64f 1950 if (bars) {
758a629f 1951 for (j=0; j<series.length; j++) {
5061b42f
DV
1952 series[j] = [series[j][0],
1953 series[j][1][0],
1954 series[j][1][1],
1955 series[j][1][2]];
354e15ab 1956 }
43af96e7 1957 } else if (this.attr_("stackedGraph")) {
43af96e7
NK
1958 var l = series.length;
1959 var actual_y;
758a629f 1960 for (j = 0; j < l; j++) {
354e15ab
DE
1961 // If one data set has a NaN, let all subsequent stacked
1962 // sets inherit the NaN -- only start at 0 for the first set.
1963 var x = series[j][0];
41b0f691 1964 if (cumulative_y[x] === undefined) {
354e15ab 1965 cumulative_y[x] = 0;
41b0f691 1966 }
43af96e7
NK
1967
1968 actual_y = series[j][1];
354e15ab 1969 cumulative_y[x] += actual_y;
43af96e7 1970
758a629f 1971 series[j] = [x, cumulative_y[x]];
43af96e7 1972
41b0f691
DV
1973 if (cumulative_y[x] > seriesExtremes[1]) {
1974 seriesExtremes[1] = cumulative_y[x];
1975 }
1976 if (cumulative_y[x] < seriesExtremes[0]) {
1977 seriesExtremes[0] = cumulative_y[x];
1978 }
43af96e7 1979 }
6a1aa64f 1980 }
354e15ab 1981
b1a3b195
DV
1982 var seriesName = this.attr_("labels")[i];
1983 extremes[seriesName] = seriesExtremes;
354e15ab 1984 datasets[i] = series;
6a1aa64f
DV
1985 }
1986
b1a3b195
DV
1987 return [ datasets, extremes, boundaryIds ];
1988};
1989
1990/**
1991 * Update the graph with new data. This method is called when the viewing area
1992 * has changed. If the underlying data or options have changed, predraw_ will
1993 * be called before drawGraph_ is called.
1994 *
1995 * clearSelection, when undefined or true, causes this.clearSelection to be
1996 * called at the end of the draw operation. This should rarely be defined,
1997 * and never true (that is it should be undefined most of the time, and
1998 * rarely false.)
1999 *
2000 * @private
2001 */
2002Dygraph.prototype.drawGraph_ = function(clearSelection) {
2003 var start = new Date();
2004
2005 if (typeof(clearSelection) === 'undefined') {
2006 clearSelection = true;
2007 }
2008
2009 // This is used to set the second parameter to drawCallback, below.
2010 var is_initial_draw = this.is_initial_draw_;
2011 this.is_initial_draw_ = false;
2012
b1a3b195
DV
2013 this.layout_.removeAllDatasets();
2014 this.setColors_();
758a629f 2015 this.attrs_.pointSize = 0.5 * this.attr_('highlightCircleSize');
b1a3b195
DV
2016
2017 var packed = this.gatherDatasets_(this.rolledSeries_, this.dateWindow_);
2018 var datasets = packed[0];
2019 var extremes = packed[1];
2020 this.boundaryIds_ = packed[2];
2021
354e15ab 2022 for (var i = 1; i < datasets.length; i++) {
4523c1f6 2023 if (!this.visibility()[i - 1]) continue;
354e15ab 2024 this.layout_.addDataset(this.attr_("labels")[i], datasets[i]);
43af96e7
NK
2025 }
2026
6faebb69 2027 this.computeYAxisRanges_(extremes);
b2c9222a
DV
2028 this.layout_.setYAxes(this.axes_);
2029
6a1aa64f
DV
2030 this.addXTicks_();
2031
b2c9222a 2032 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
81856f70 2033 var tmp_zoomed_x = this.zoomed_x_;
6a1aa64f 2034 // Tell PlotKit to use this new data and render itself
b2c9222a 2035 this.layout_.setDateWindow(this.dateWindow_);
81856f70 2036 this.zoomed_x_ = tmp_zoomed_x;
6a1aa64f 2037 this.layout_.evaluateWithError();
9ca829f2
DV
2038 this.renderGraph_(is_initial_draw, false);
2039
2040 if (this.attr_("timingName")) {
2041 var end = new Date();
2042 if (console) {
758a629f 2043 console.log(this.attr_("timingName") + " - drawGraph: " + (end - start) + "ms");
9ca829f2
DV
2044 }
2045 }
2046};
2047
2048Dygraph.prototype.renderGraph_ = function(is_initial_draw, clearSelection) {
6a1aa64f
DV
2049 this.plotter_.clear();
2050 this.plotter_.render();
f6401bf6 2051 this.canvas_.getContext('2d').clearRect(0, 0, this.canvas_.width,
2f5e7e1a 2052 this.canvas_.height);
599fb4ad 2053
4a0cb9c4
DV
2054 // Generate a static legend before any particular point is selected.
2055 this.setLegendHTML_();
2056
2057 if (!is_initial_draw) {
fc4e84fa
RK
2058 if (clearSelection) {
2059 if (typeof(this.selPoints_) !== 'undefined' && this.selPoints_.length) {
2060 // We should select the point nearest the page x/y here, but it's easier
2061 // to just clear the selection. This prevents erroneous hover dots from
2062 // being displayed.
2063 this.clearSelection();
2064 } else {
2065 this.clearSelection();
2066 }
06303c32 2067 }
2fccd3dc
DV
2068 }
2069
ccd9d7c2
PF
2070 if (this.rangeSelector_) {
2071 this.rangeSelector_.renderInteractiveLayer();
2072 }
2073
599fb4ad 2074 if (this.attr_("drawCallback") !== null) {
fe0b7c03 2075 this.attr_("drawCallback")(this, is_initial_draw);
599fb4ad 2076 }
6a1aa64f
DV
2077};
2078
2079/**
629a09ae 2080 * @private
26ca7938
DV
2081 * Determine properties of the y-axes which are independent of the data
2082 * currently being displayed. This includes things like the number of axes and
2083 * the style of the axes. It does not include the range of each axis and its
2084 * tick marks.
2085 * This fills in this.axes_ and this.seriesToAxisMap_.
2086 * axes_ = [ { options } ]
2087 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2088 * indices are into the axes_ array.
f09fc545 2089 */
26ca7938 2090Dygraph.prototype.computeYAxes_ = function() {
d64b8fea
RK
2091 // Preserve valueWindow settings if they exist, and if the user hasn't
2092 // specified a new valueRange.
758a629f
DV
2093 var i, valueWindows, seriesName, axis, index;
2094 if (this.axes_ !== undefined && this.user_attrs_.hasOwnProperty("valueRange") === false) {
d64b8fea 2095 valueWindows = [];
758a629f 2096 for (index = 0; index < this.axes_.length; index++) {
d64b8fea
RK
2097 valueWindows.push(this.axes_[index].valueWindow);
2098 }
2099 }
2100
00aa7f61 2101 this.axes_ = [{ yAxisId : 0, g : this }]; // always have at least one y-axis.
26ca7938
DV
2102 this.seriesToAxisMap_ = {};
2103
2104 // Get a list of series names.
2105 var labels = this.attr_("labels");
1c77a3a1 2106 var series = {};
758a629f 2107 for (i = 1; i < labels.length; i++) series[labels[i]] = (i - 1);
f09fc545
DV
2108
2109 // all options which could be applied per-axis:
2110 var axisOptions = [
2111 'includeZero',
2112 'valueRange',
2113 'labelsKMB',
2114 'labelsKMG2',
2115 'pixelsPerYLabel',
2116 'yAxisLabelWidth',
2117 'axisLabelFontSize',
7d0e7a0d
RK
2118 'axisTickSize',
2119 'logscale'
f09fc545
DV
2120 ];
2121
2122 // Copy global axis options over to the first axis.
758a629f 2123 for (i = 0; i < axisOptions.length; i++) {
f09fc545
DV
2124 var k = axisOptions[i];
2125 var v = this.attr_(k);
26ca7938 2126 if (v) this.axes_[0][k] = v;
f09fc545
DV
2127 }
2128
2129 // Go through once and add all the axes.
758a629f 2130 for (seriesName in series) {
26ca7938 2131 if (!series.hasOwnProperty(seriesName)) continue;
758a629f
DV
2132 axis = this.attr_("axis", seriesName);
2133 if (axis === null) {
26ca7938 2134 this.seriesToAxisMap_[seriesName] = 0;
f09fc545
DV
2135 continue;
2136 }
2137 if (typeof(axis) == 'object') {
2138 // Add a new axis, making a copy of its per-axis options.
2139 var opts = {};
26ca7938 2140 Dygraph.update(opts, this.axes_[0]);
f09fc545 2141 Dygraph.update(opts, { valueRange: null }); // shouldn't inherit this.
00aa7f61
RK
2142 var yAxisId = this.axes_.length;
2143 opts.yAxisId = yAxisId;
2144 opts.g = this;
f09fc545 2145 Dygraph.update(opts, axis);
26ca7938 2146 this.axes_.push(opts);
00aa7f61 2147 this.seriesToAxisMap_[seriesName] = yAxisId;
f09fc545
DV
2148 }
2149 }
2150
2151 // Go through one more time and assign series to an axis defined by another
2152 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
758a629f 2153 for (seriesName in series) {
26ca7938 2154 if (!series.hasOwnProperty(seriesName)) continue;
758a629f 2155 axis = this.attr_("axis", seriesName);
f09fc545 2156 if (typeof(axis) == 'string') {
26ca7938 2157 if (!this.seriesToAxisMap_.hasOwnProperty(axis)) {
f09fc545
DV
2158 this.error("Series " + seriesName + " wants to share a y-axis with " +
2159 "series " + axis + ", which does not define its own axis.");
2160 return null;
2161 }
26ca7938
DV
2162 var idx = this.seriesToAxisMap_[axis];
2163 this.seriesToAxisMap_[seriesName] = idx;
f09fc545
DV
2164 }
2165 }
1c77a3a1 2166
758a629f 2167 if (valueWindows !== undefined) {
d64b8fea 2168 // Restore valueWindow settings.
758a629f 2169 for (index = 0; index < valueWindows.length; index++) {
d64b8fea
RK
2170 this.axes_[index].valueWindow = valueWindows[index];
2171 }
2172 }
26ca7938
DV
2173};
2174
2175/**
2176 * Returns the number of y-axes on the chart.
2177 * @return {Number} the number of axes.
2178 */
2179Dygraph.prototype.numAxes = function() {
2180 var last_axis = 0;
2181 for (var series in this.seriesToAxisMap_) {
2182 if (!this.seriesToAxisMap_.hasOwnProperty(series)) continue;
2183 var idx = this.seriesToAxisMap_[series];
2184 if (idx > last_axis) last_axis = idx;
2185 }
2186 return 1 + last_axis;
2187};
2188
2189/**
629a09ae 2190 * @private
b2c9222a
DV
2191 * Returns axis properties for the given series.
2192 * @param { String } setName The name of the series for which to get axis
2193 * properties, e.g. 'Y1'.
2194 * @return { Object } The axis properties.
2195 */
2196Dygraph.prototype.axisPropertiesForSeries = function(series) {
2197 // TODO(danvk): handle errors.
2198 return this.axes_[this.seriesToAxisMap_[series]];
2199};
2200
2201/**
2202 * @private
26ca7938
DV
2203 * Determine the value range and tick marks for each axis.
2204 * @param {Object} extremes A mapping from seriesName -> [low, high]
2205 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2206 */
2207Dygraph.prototype.computeYAxisRanges_ = function(extremes) {
2208 // Build a map from axis number -> [list of series names]
758a629f
DV
2209 var seriesForAxis = [], series;
2210 for (series in this.seriesToAxisMap_) {
26ca7938
DV
2211 if (!this.seriesToAxisMap_.hasOwnProperty(series)) continue;
2212 var idx = this.seriesToAxisMap_[series];
2213 while (seriesForAxis.length <= idx) seriesForAxis.push([]);
2214 seriesForAxis[idx].push(series);
2215 }
f09fc545
DV
2216
2217 // Compute extreme values, a span and tick marks for each axis.
26ca7938
DV
2218 for (var i = 0; i < this.axes_.length; i++) {
2219 var axis = this.axes_[i];
25f76ae3 2220
06fc69b6
AV
2221 if (!seriesForAxis[i]) {
2222 // If no series are defined or visible then use a reasonable default
2223 axis.extremeRange = [0, 1];
2224 } else {
1c77a3a1 2225 // Calculate the extremes of extremes.
758a629f 2226 series = seriesForAxis[i];
f09fc545
DV
2227 var minY = Infinity; // extremes[series[0]][0];
2228 var maxY = -Infinity; // extremes[series[0]][1];
ba049b89 2229 var extremeMinY, extremeMaxY;
a2da3777 2230
f09fc545 2231 for (var j = 0; j < series.length; j++) {
a2da3777
DV
2232 // this skips invisible series
2233 if (!extremes.hasOwnProperty(series[j])) continue;
2234
ba049b89
NN
2235 // Only use valid extremes to stop null data series' from corrupting the scale.
2236 extremeMinY = extremes[series[j]][0];
758a629f 2237 if (extremeMinY !== null) {
36dfa958 2238 minY = Math.min(extremeMinY, minY);
ba049b89
NN
2239 }
2240 extremeMaxY = extremes[series[j]][1];
758a629f 2241 if (extremeMaxY !== null) {
36dfa958 2242 maxY = Math.max(extremeMaxY, maxY);
ba049b89 2243 }
f09fc545
DV
2244 }
2245 if (axis.includeZero && minY > 0) minY = 0;
2246
a2da3777 2247 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
36dfa958 2248 if (minY == Infinity) minY = 0;
a2da3777 2249 if (maxY == -Infinity) maxY = 1;
ba049b89 2250
f09fc545
DV
2251 // Add some padding and round up to an integer to be human-friendly.
2252 var span = maxY - minY;
2253 // special case: if we have no sense of scale, use +/-10% of the sole value.
758a629f 2254 if (span === 0) { span = maxY; }
f09fc545 2255
758a629f 2256 var maxAxisY, minAxisY;
7d0e7a0d 2257 if (axis.logscale) {
758a629f
DV
2258 maxAxisY = maxY + 0.1 * span;
2259 minAxisY = minY;
ff022deb 2260 } else {
758a629f
DV
2261 maxAxisY = maxY + 0.1 * span;
2262 minAxisY = minY - 0.1 * span;
f09fc545 2263
ff022deb
RK
2264 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2265 if (!this.attr_("avoidMinZero")) {
2266 if (minAxisY < 0 && minY >= 0) minAxisY = 0;
2267 if (maxAxisY > 0 && maxY <= 0) maxAxisY = 0;
2268 }
f09fc545 2269
ff022deb
RK
2270 if (this.attr_("includeZero")) {
2271 if (maxY < 0) maxAxisY = 0;
2272 if (minY > 0) minAxisY = 0;
2273 }
f09fc545 2274 }
4cac8c7a
RK
2275 axis.extremeRange = [minAxisY, maxAxisY];
2276 }
2277 if (axis.valueWindow) {
2278 // This is only set if the user has zoomed on the y-axis. It is never set
2279 // by a user. It takes precedence over axis.valueRange because, if you set
2280 // valueRange, you'd still expect to be able to pan.
2281 axis.computedValueRange = [axis.valueWindow[0], axis.valueWindow[1]];
2282 } else if (axis.valueRange) {
2283 // This is a user-set value range for this axis.
2284 axis.computedValueRange = [axis.valueRange[0], axis.valueRange[1]];
2285 } else {
2286 axis.computedValueRange = axis.extremeRange;
f09fc545
DV
2287 }
2288
0d64e596
DV
2289 // Add ticks. By default, all axes inherit the tick positions of the
2290 // primary axis. However, if an axis is specifically marked as having
2291 // independent ticks, then that is permissible as well.
48e614ac
DV
2292 var opts = this.optionsViewForAxis_('y' + (i ? '2' : ''));
2293 var ticker = opts('ticker');
758a629f 2294 if (i === 0 || axis.independentTicks) {
48e614ac
DV
2295 axis.ticks = ticker(axis.computedValueRange[0],
2296 axis.computedValueRange[1],
2297 this.height_, // TODO(danvk): should be area.height
2298 opts,
2299 this);
0d64e596
DV
2300 } else {
2301 var p_axis = this.axes_[0];
2302 var p_ticks = p_axis.ticks;
2303 var p_scale = p_axis.computedValueRange[1] - p_axis.computedValueRange[0];
2304 var scale = axis.computedValueRange[1] - axis.computedValueRange[0];
2305 var tick_values = [];
25f76ae3
DV
2306 for (var k = 0; k < p_ticks.length; k++) {
2307 var y_frac = (p_ticks[k].v - p_axis.computedValueRange[0]) / p_scale;
0d64e596
DV
2308 var y_val = axis.computedValueRange[0] + y_frac * scale;
2309 tick_values.push(y_val);
2310 }
2311
48e614ac
DV
2312 axis.ticks = ticker(axis.computedValueRange[0],
2313 axis.computedValueRange[1],
2314 this.height_, // TODO(danvk): should be area.height
2315 opts,
2316 this,
2317 tick_values);
0d64e596 2318 }
f09fc545 2319 }
f09fc545 2320};
25f76ae3 2321
f09fc545 2322/**
b1a3b195
DV
2323 * Extracts one series from the raw data (a 2D array) into an array of (date,
2324 * value) tuples.
2325 *
2326 * This is where undesirable points (i.e. negative values on log scales and
2327 * missing values through which we wish to connect lines) are dropped.
2328 *
2329 * @private
2330 */
2331Dygraph.prototype.extractSeries_ = function(rawData, i, logScale, connectSeparatedPoints) {
2332 var series = [];
2333 for (var j = 0; j < rawData.length; j++) {
2334 var x = rawData[j][0];
2335 var point = rawData[j][i];
2336 if (logScale) {
2337 // On the log scale, points less than zero do not exist.
2338 // This will create a gap in the chart. Note that this ignores
2339 // connectSeparatedPoints.
2340 if (point <= 0) {
2341 point = null;
2342 }
2343 series.push([x, point]);
2344 } else {
758a629f 2345 if (point !== null || !connectSeparatedPoints) {
b1a3b195
DV
2346 series.push([x, point]);
2347 }
2348 }
2349 }
2350 return series;
2351};
2352
2353/**
629a09ae 2354 * @private
6a1aa64f
DV
2355 * Calculates the rolling average of a data set.
2356 * If originalData is [label, val], rolls the average of those.
2357 * If originalData is [label, [, it's interpreted as [value, stddev]
2358 * and the roll is returned in the same form, with appropriately reduced
2359 * stddev for each value.
2360 * Note that this is where fractional input (i.e. '5/10') is converted into
2361 * decimal values.
2362 * @param {Array} originalData The data in the appropriate format (see above)
6faebb69
JB
2363 * @param {Number} rollPeriod The number of points over which to average the
2364 * data
6a1aa64f 2365 */
285a6bda 2366Dygraph.prototype.rollingAverage = function(originalData, rollPeriod) {
6a1aa64f
DV
2367 if (originalData.length < 2)
2368 return originalData;
758a629f 2369 rollPeriod = Math.min(rollPeriod, originalData.length);
6a1aa64f 2370 var rollingData = [];
285a6bda 2371 var sigma = this.attr_("sigma");
6a1aa64f 2372
758a629f 2373 var low, high, i, j, y, sum, num_ok, stddev;
6a1aa64f
DV
2374 if (this.fractions_) {
2375 var num = 0;
2376 var den = 0; // numerator/denominator
2377 var mult = 100.0;
758a629f 2378 for (i = 0; i < originalData.length; i++) {
6a1aa64f
DV
2379 num += originalData[i][1][0];
2380 den += originalData[i][1][1];
2381 if (i - rollPeriod >= 0) {
2382 num -= originalData[i - rollPeriod][1][0];
2383 den -= originalData[i - rollPeriod][1][1];
2384 }
2385
2386 var date = originalData[i][0];
2387 var value = den ? num / den : 0.0;
285a6bda 2388 if (this.attr_("errorBars")) {
395e98a3 2389 if (this.attr_("wilsonInterval")) {
6a1aa64f
DV
2390 // For more details on this confidence interval, see:
2391 // http://en.wikipedia.org/wiki/Binomial_confidence_interval
2392 if (den) {
2393 var p = value < 0 ? 0 : value, n = den;
2394 var pm = sigma * Math.sqrt(p*(1-p)/n + sigma*sigma/(4*n*n));
2395 var denom = 1 + sigma * sigma / den;
758a629f
DV
2396 low = (p + sigma * sigma / (2 * den) - pm) / denom;
2397 high = (p + sigma * sigma / (2 * den) + pm) / denom;
6a1aa64f
DV
2398 rollingData[i] = [date,
2399 [p * mult, (p - low) * mult, (high - p) * mult]];
2400 } else {
2401 rollingData[i] = [date, [0, 0, 0]];
2402 }
2403 } else {
758a629f 2404 stddev = den ? sigma * Math.sqrt(value * (1 - value) / den) : 1.0;
6a1aa64f
DV
2405 rollingData[i] = [date, [mult * value, mult * stddev, mult * stddev]];
2406 }
2407 } else {
2408 rollingData[i] = [date, mult * value];
2409 }
2410 }
9922b78b 2411 } else if (this.attr_("customBars")) {
758a629f 2412 low = 0;
f6885d6a 2413 var mid = 0;
758a629f 2414 high = 0;
f6885d6a 2415 var count = 0;
758a629f 2416 for (i = 0; i < originalData.length; i++) {
6a1aa64f 2417 var data = originalData[i][1];
758a629f 2418 y = data[1];
6a1aa64f 2419 rollingData[i] = [originalData[i][0], [y, y - data[0], data[2] - y]];
f6885d6a 2420
758a629f 2421 if (y !== null && !isNaN(y)) {
49a7d0d5
DV
2422 low += data[0];
2423 mid += y;
2424 high += data[2];
2425 count += 1;
2426 }
f6885d6a
DV
2427 if (i - rollPeriod >= 0) {
2428 var prev = originalData[i - rollPeriod];
758a629f 2429 if (prev[1][1] !== null && !isNaN(prev[1][1])) {
49a7d0d5
DV
2430 low -= prev[1][0];
2431 mid -= prev[1][1];
2432 high -= prev[1][2];
2433 count -= 1;
2434 }
f6885d6a 2435 }
502d5996
DV
2436 if (count) {
2437 rollingData[i] = [originalData[i][0], [ 1.0 * mid / count,
2438 1.0 * (mid - low) / count,
2439 1.0 * (high - mid) / count ]];
2440 } else {
2441 rollingData[i] = [originalData[i][0], [null, null, null]];
2442 }
2769de62 2443 }
6a1aa64f
DV
2444 } else {
2445 // Calculate the rolling average for the first rollPeriod - 1 points where
6faebb69 2446 // there is not enough data to roll over the full number of points
285a6bda 2447 if (!this.attr_("errorBars")){
5011e7a1
DV
2448 if (rollPeriod == 1) {
2449 return originalData;
2450 }
2451
758a629f
DV
2452 for (i = 0; i < originalData.length; i++) {
2453 sum = 0;
2454 num_ok = 0;
2455 for (j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) {
2456 y = originalData[j][1];
2457 if (y === null || isNaN(y)) continue;
5011e7a1 2458 num_ok++;
2847c1cf 2459 sum += originalData[j][1];
6a1aa64f 2460 }
5011e7a1 2461 if (num_ok) {
2847c1cf 2462 rollingData[i] = [originalData[i][0], sum / num_ok];
5011e7a1 2463 } else {
2847c1cf 2464 rollingData[i] = [originalData[i][0], null];
5011e7a1 2465 }
6a1aa64f 2466 }
2847c1cf
DV
2467
2468 } else {
758a629f
DV
2469 for (i = 0; i < originalData.length; i++) {
2470 sum = 0;
6a1aa64f 2471 var variance = 0;
758a629f
DV
2472 num_ok = 0;
2473 for (j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) {
2474 y = originalData[j][1][0];
2475 if (y === null || isNaN(y)) continue;
5011e7a1 2476 num_ok++;
6a1aa64f
DV
2477 sum += originalData[j][1][0];
2478 variance += Math.pow(originalData[j][1][1], 2);
2479 }
5011e7a1 2480 if (num_ok) {
758a629f 2481 stddev = Math.sqrt(variance) / num_ok;
5011e7a1
DV
2482 rollingData[i] = [originalData[i][0],
2483 [sum / num_ok, sigma * stddev, sigma * stddev]];
2484 } else {
2485 rollingData[i] = [originalData[i][0], [null, null, null]];
2486 }
6a1aa64f
DV
2487 }
2488 }
2489 }
2490
2491 return rollingData;
2492};
2493
2494/**
285a6bda
DV
2495 * Detects the type of the str (date or numeric) and sets the various
2496 * formatting attributes in this.attrs_ based on this type.
2497 * @param {String} str An x value.
2498 * @private
2499 */
2500Dygraph.prototype.detectTypeFromString_ = function(str) {
2501 var isDate = false;
0842b24b
DV
2502 var dashPos = str.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2503 if ((dashPos > 0 && (str[dashPos-1] != 'e' && str[dashPos-1] != 'E')) ||
285a6bda
DV
2504 str.indexOf('/') >= 0 ||
2505 isNaN(parseFloat(str))) {
2506 isDate = true;
2507 } else if (str.length == 8 && str > '19700101' && str < '20371231') {
2508 // TODO(danvk): remove support for this format.
2509 isDate = true;
2510 }
2511
2512 if (isDate) {
285a6bda 2513 this.attrs_.xValueParser = Dygraph.dateParser;
48e614ac
DV
2514 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
2515 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
2516 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
285a6bda 2517 } else {
c39e1d93 2518 /** @private (shut up, jsdoc!) */
285a6bda 2519 this.attrs_.xValueParser = function(x) { return parseFloat(x); };
48e614ac
DV
2520 // TODO(danvk): use Dygraph.numberValueFormatter here?
2521 /** @private (shut up, jsdoc!) */
2522 this.attrs_.axes.x.valueFormatter = function(x) { return x; };
2523 this.attrs_.axes.x.ticker = Dygraph.numericTicks;
2524 this.attrs_.axes.x.axisLabelFormatter = this.attrs_.axes.x.valueFormatter;
6a1aa64f 2525 }
6a1aa64f
DV
2526};
2527
2528/**
5cd7ac68
DV
2529 * Parses the value as a floating point number. This is like the parseFloat()
2530 * built-in, but with a few differences:
2531 * - the empty string is parsed as null, rather than NaN.
2532 * - if the string cannot be parsed at all, an error is logged.
2533 * If the string can't be parsed, this method returns null.
2534 * @param {String} x The string to be parsed
2535 * @param {Number} opt_line_no The line number from which the string comes.
2536 * @param {String} opt_line The text of the line from which the string comes.
2537 * @private
2538 */
2539
2540// Parse the x as a float or return null if it's not a number.
2541Dygraph.prototype.parseFloat_ = function(x, opt_line_no, opt_line) {
2542 var val = parseFloat(x);
2543 if (!isNaN(val)) return val;
2544
2545 // Try to figure out what happeend.
2546 // If the value is the empty string, parse it as null.
2547 if (/^ *$/.test(x)) return null;
2548
2549 // If it was actually "NaN", return it as NaN.
2550 if (/^ *nan *$/i.test(x)) return NaN;
2551
2552 // Looks like a parsing error.
2553 var msg = "Unable to parse '" + x + "' as a number";
2554 if (opt_line !== null && opt_line_no !== null) {
2555 msg += " on line " + (1+opt_line_no) + " ('" + opt_line + "') of CSV.";
2556 }
2557 this.error(msg);
2558
2559 return null;
2560};
2561
2562/**
629a09ae 2563 * @private
6a1aa64f
DV
2564 * Parses a string in a special csv format. We expect a csv file where each
2565 * line is a date point, and the first field in each line is the date string.
2566 * We also expect that all remaining fields represent series.
285a6bda 2567 * if the errorBars attribute is set, then interpret the fields as:
6a1aa64f 2568 * date, series1, stddev1, series2, stddev2, ...
629a09ae 2569 * @param {[Object]} data See above.
285a6bda 2570 *
629a09ae 2571 * @return [Object] An array with one entry for each row. These entries
285a6bda
DV
2572 * are an array of cells in that row. The first entry is the parsed x-value for
2573 * the row. The second, third, etc. are the y-values. These can take on one of
2574 * three forms, depending on the CSV and constructor parameters:
2575 * 1. numeric value
2576 * 2. [ value, stddev ]
2577 * 3. [ low value, center value, high value ]
6a1aa64f 2578 */
285a6bda 2579Dygraph.prototype.parseCSV_ = function(data) {
6a1aa64f
DV
2580 var ret = [];
2581 var lines = data.split("\n");
758a629f 2582 var vals, j;
3d67f03b
DV
2583
2584 // Use the default delimiter or fall back to a tab if that makes sense.
2585 var delim = this.attr_('delimiter');
2586 if (lines[0].indexOf(delim) == -1 && lines[0].indexOf('\t') >= 0) {
2587 delim = '\t';
2588 }
2589
285a6bda 2590 var start = 0;
d7beab6b
DV
2591 if (!('labels' in this.user_attrs_)) {
2592 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
285a6bda 2593 start = 1;
d7beab6b 2594 this.attrs_.labels = lines[0].split(delim); // NOTE: _not_ user_attrs_.
6a1aa64f 2595 }
5cd7ac68 2596 var line_no = 0;
03b522a4 2597
285a6bda
DV
2598 var xParser;
2599 var defaultParserSet = false; // attempt to auto-detect x value type
2600 var expectedCols = this.attr_("labels").length;
987840a2 2601 var outOfOrder = false;
6a1aa64f
DV
2602 for (var i = start; i < lines.length; i++) {
2603 var line = lines[i];
5cd7ac68 2604 line_no = i;
758a629f 2605 if (line.length === 0) continue; // skip blank lines
3d67f03b
DV
2606 if (line[0] == '#') continue; // skip comment lines
2607 var inFields = line.split(delim);
285a6bda 2608 if (inFields.length < 2) continue;
6a1aa64f
DV
2609
2610 var fields = [];
285a6bda
DV
2611 if (!defaultParserSet) {
2612 this.detectTypeFromString_(inFields[0]);
2613 xParser = this.attr_("xValueParser");
2614 defaultParserSet = true;
2615 }
2616 fields[0] = xParser(inFields[0], this);
6a1aa64f
DV
2617
2618 // If fractions are expected, parse the numbers as "A/B"
2619 if (this.fractions_) {
758a629f 2620 for (j = 1; j < inFields.length; j++) {
6a1aa64f 2621 // TODO(danvk): figure out an appropriate way to flag parse errors.
758a629f 2622 vals = inFields[j].split("/");
7219edb3
DV
2623 if (vals.length != 2) {
2624 this.error('Expected fractional "num/den" values in CSV data ' +
2625 "but found a value '" + inFields[j] + "' on line " +
2626 (1 + i) + " ('" + line + "') which is not of this form.");
2627 fields[j] = [0, 0];
2628 } else {
2629 fields[j] = [this.parseFloat_(vals[0], i, line),
2630 this.parseFloat_(vals[1], i, line)];
2631 }
6a1aa64f 2632 }
285a6bda 2633 } else if (this.attr_("errorBars")) {
6a1aa64f 2634 // If there are error bars, values are (value, stddev) pairs
7219edb3
DV
2635 if (inFields.length % 2 != 1) {
2636 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2637 'but line ' + (1 + i) + ' has an odd number of values (' +
2638 (inFields.length - 1) + "): '" + line + "'");
2639 }
758a629f 2640 for (j = 1; j < inFields.length; j += 2) {
5cd7ac68
DV
2641 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2642 this.parseFloat_(inFields[j + 1], i, line)];
7219edb3 2643 }
9922b78b 2644 } else if (this.attr_("customBars")) {
6a1aa64f 2645 // Bars are a low;center;high tuple
758a629f 2646 for (j = 1; j < inFields.length; j++) {
327a9279
DV
2647 var val = inFields[j];
2648 if (/^ *$/.test(val)) {
2649 fields[j] = [null, null, null];
2650 } else {
758a629f 2651 vals = val.split(";");
327a9279
DV
2652 if (vals.length == 3) {
2653 fields[j] = [ this.parseFloat_(vals[0], i, line),
2654 this.parseFloat_(vals[1], i, line),
2655 this.parseFloat_(vals[2], i, line) ];
2656 } else {
1a5dc2af
RK
2657 this.warn('When using customBars, values must be either blank ' +
2658 'or "low;center;high" tuples (got "' + val +
2659 '" on line ' + (1+i));
327a9279
DV
2660 }
2661 }
6a1aa64f
DV
2662 }
2663 } else {
2664 // Values are just numbers
758a629f 2665 for (j = 1; j < inFields.length; j++) {
5cd7ac68 2666 fields[j] = this.parseFloat_(inFields[j], i, line);
285a6bda 2667 }
6a1aa64f 2668 }
987840a2
DV
2669 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2670 outOfOrder = true;
2671 }
285a6bda
DV
2672
2673 if (fields.length != expectedCols) {
2674 this.error("Number of columns in line " + i + " (" + fields.length +
2675 ") does not agree with number of labels (" + expectedCols +
2676 ") " + line);
2677 }
6d0aaa09
DV
2678
2679 // If the user specified the 'labels' option and none of the cells of the
2680 // first row parsed correctly, then they probably double-specified the
2681 // labels. We go with the values set in the option, discard this row and
2682 // log a warning to the JS console.
758a629f 2683 if (i === 0 && this.attr_('labels')) {
6d0aaa09 2684 var all_null = true;
758a629f 2685 for (j = 0; all_null && j < fields.length; j++) {
6d0aaa09
DV
2686 if (fields[j]) all_null = false;
2687 }
2688 if (all_null) {
2689 this.warn("The dygraphs 'labels' option is set, but the first row of " +
2690 "CSV data ('" + line + "') appears to also contain labels. " +
2691 "Will drop the CSV labels and use the option labels.");
2692 continue;
2693 }
2694 }
2695 ret.push(fields);
6a1aa64f 2696 }
987840a2
DV
2697
2698 if (outOfOrder) {
2699 this.warn("CSV is out of order; order it correctly to speed loading.");
758a629f 2700 ret.sort(function(a,b) { return a[0] - b[0]; });
987840a2
DV
2701 }
2702
6a1aa64f
DV
2703 return ret;
2704};
2705
2706/**
629a09ae 2707 * @private
285a6bda
DV
2708 * The user has provided their data as a pre-packaged JS array. If the x values
2709 * are numeric, this is the same as dygraphs' internal format. If the x values
2710 * are dates, we need to convert them from Date objects to ms since epoch.
629a09ae
DV
2711 * @param {[Object]} data
2712 * @return {[Object]} data with numeric x values.
285a6bda
DV
2713 */
2714Dygraph.prototype.parseArray_ = function(data) {
2715 // Peek at the first x value to see if it's numeric.
758a629f 2716 if (data.length === 0) {
285a6bda
DV
2717 this.error("Can't plot empty data set");
2718 return null;
2719 }
758a629f 2720 if (data[0].length === 0) {
285a6bda
DV
2721 this.error("Data set cannot contain an empty row");
2722 return null;
2723 }
2724
758a629f
DV
2725 var i;
2726 if (this.attr_("labels") === null) {
285a6bda
DV
2727 this.warn("Using default labels. Set labels explicitly via 'labels' " +
2728 "in the options parameter");
2729 this.attrs_.labels = [ "X" ];
758a629f 2730 for (i = 1; i < data[0].length; i++) {
285a6bda
DV
2731 this.attrs_.labels.push("Y" + i);
2732 }
2733 }
2734
2dda3850 2735 if (Dygraph.isDateLike(data[0][0])) {
285a6bda 2736 // Some intelligent defaults for a date x-axis.
48e614ac
DV
2737 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
2738 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
2739 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
285a6bda
DV
2740
2741 // Assume they're all dates.
e3ab7b40 2742 var parsedData = Dygraph.clone(data);
758a629f
DV
2743 for (i = 0; i < data.length; i++) {
2744 if (parsedData[i].length === 0) {
a323ff4a 2745 this.error("Row " + (1 + i) + " of data is empty");
285a6bda
DV
2746 return null;
2747 }
758a629f
DV
2748 if (parsedData[i][0] === null ||
2749 typeof(parsedData[i][0].getTime) != 'function' ||
2750 isNaN(parsedData[i][0].getTime())) {
be96a1f5 2751 this.error("x value in row " + (1 + i) + " is not a Date");
285a6bda
DV
2752 return null;
2753 }
2754 parsedData[i][0] = parsedData[i][0].getTime();
2755 }
2756 return parsedData;
2757 } else {
2758 // Some intelligent defaults for a numeric x-axis.
c39e1d93 2759 /** @private (shut up, jsdoc!) */
48e614ac
DV
2760 this.attrs_.axes.x.valueFormatter = function(x) { return x; };
2761 this.attrs_.axes.x.axisLabelFormatter = Dygraph.numberAxisLabelFormatter;
2762 this.attrs_.axes.x.ticker = Dygraph.numericTicks;
285a6bda
DV
2763 return data;
2764 }
2765};
2766
2767/**
79420a1e
DV
2768 * Parses a DataTable object from gviz.
2769 * The data is expected to have a first column that is either a date or a
2770 * number. All subsequent columns must be numbers. If there is a clear mismatch
2771 * between this.xValueParser_ and the type of the first column, it will be
a685723c 2772 * fixed. Fills out rawData_.
629a09ae 2773 * @param {[Object]} data See above.
79420a1e
DV
2774 * @private
2775 */
285a6bda 2776Dygraph.prototype.parseDataTable_ = function(data) {
79420a1e
DV
2777 var cols = data.getNumberOfColumns();
2778 var rows = data.getNumberOfRows();
2779
d955e223 2780 var indepType = data.getColumnType(0);
4440f6c8 2781 if (indepType == 'date' || indepType == 'datetime') {
285a6bda 2782 this.attrs_.xValueParser = Dygraph.dateParser;
48e614ac
DV
2783 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
2784 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
2785 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
33127159 2786 } else if (indepType == 'number') {
285a6bda 2787 this.attrs_.xValueParser = function(x) { return parseFloat(x); };
48e614ac
DV
2788 this.attrs_.axes.x.valueFormatter = function(x) { return x; };
2789 this.attrs_.axes.x.ticker = Dygraph.numericTicks;
2790 this.attrs_.axes.x.axisLabelFormatter = this.attrs_.axes.x.valueFormatter;
285a6bda 2791 } else {
987840a2
DV
2792 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2793 "column 1 of DataTable input (Got '" + indepType + "')");
79420a1e
DV
2794 return null;
2795 }
2796
a685723c
DV
2797 // Array of the column indices which contain data (and not annotations).
2798 var colIdx = [];
2799 var annotationCols = {}; // data index -> [annotation cols]
2800 var hasAnnotations = false;
758a629f
DV
2801 var i, j;
2802 for (i = 1; i < cols; i++) {
a685723c
DV
2803 var type = data.getColumnType(i);
2804 if (type == 'number') {
2805 colIdx.push(i);
2806 } else if (type == 'string' && this.attr_('displayAnnotations')) {
2807 // This is OK -- it's an annotation column.
2808 var dataIdx = colIdx[colIdx.length - 1];
2809 if (!annotationCols.hasOwnProperty(dataIdx)) {
2810 annotationCols[dataIdx] = [i];
2811 } else {
2812 annotationCols[dataIdx].push(i);
2813 }
2814 hasAnnotations = true;
2815 } else {
2816 this.error("Only 'number' is supported as a dependent type with Gviz." +
2817 " 'string' is only supported if displayAnnotations is true");
2818 }
2819 }
2820
2821 // Read column labels
2822 // TODO(danvk): add support back for errorBars
2823 var labels = [data.getColumnLabel(0)];
758a629f 2824 for (i = 0; i < colIdx.length; i++) {
a685723c 2825 labels.push(data.getColumnLabel(colIdx[i]));
f9348814 2826 if (this.attr_("errorBars")) i += 1;
a685723c
DV
2827 }
2828 this.attrs_.labels = labels;
2829 cols = labels.length;
2830
79420a1e 2831 var ret = [];
987840a2 2832 var outOfOrder = false;
a685723c 2833 var annotations = [];
758a629f 2834 for (i = 0; i < rows; i++) {
79420a1e 2835 var row = [];
debe4434
DV
2836 if (typeof(data.getValue(i, 0)) === 'undefined' ||
2837 data.getValue(i, 0) === null) {
129569a5
FD
2838 this.warn("Ignoring row " + i +
2839 " of DataTable because of undefined or null first column.");
debe4434
DV
2840 continue;
2841 }
2842
c21d2c2d 2843 if (indepType == 'date' || indepType == 'datetime') {
d955e223
DV
2844 row.push(data.getValue(i, 0).getTime());
2845 } else {
2846 row.push(data.getValue(i, 0));
2847 }
3e3f84e4 2848 if (!this.attr_("errorBars")) {
758a629f 2849 for (j = 0; j < colIdx.length; j++) {
a685723c
DV
2850 var col = colIdx[j];
2851 row.push(data.getValue(i, col));
2852 if (hasAnnotations &&
2853 annotationCols.hasOwnProperty(col) &&
758a629f 2854 data.getValue(i, annotationCols[col][0]) !== null) {
a685723c
DV
2855 var ann = {};
2856 ann.series = data.getColumnLabel(col);
2857 ann.xval = row[0];
758a629f 2858 ann.shortText = String.fromCharCode(65 /* A */ + annotations.length);
a685723c
DV
2859 ann.text = '';
2860 for (var k = 0; k < annotationCols[col].length; k++) {
2861 if (k) ann.text += "\n";
2862 ann.text += data.getValue(i, annotationCols[col][k]);
2863 }
2864 annotations.push(ann);
2865 }
3e3f84e4 2866 }
92fd68d8
DV
2867
2868 // Strip out infinities, which give dygraphs problems later on.
758a629f 2869 for (j = 0; j < row.length; j++) {
92fd68d8
DV
2870 if (!isFinite(row[j])) row[j] = null;
2871 }
3e3f84e4 2872 } else {
758a629f 2873 for (j = 0; j < cols - 1; j++) {
3e3f84e4
DV
2874 row.push([ data.getValue(i, 1 + 2 * j), data.getValue(i, 2 + 2 * j) ]);
2875 }
79420a1e 2876 }
987840a2
DV
2877 if (ret.length > 0 && row[0] < ret[ret.length - 1][0]) {
2878 outOfOrder = true;
2879 }
243d96e8 2880 ret.push(row);
79420a1e 2881 }
987840a2
DV
2882
2883 if (outOfOrder) {
2884 this.warn("DataTable is out of order; order it correctly to speed loading.");
758a629f 2885 ret.sort(function(a,b) { return a[0] - b[0]; });
987840a2 2886 }
a685723c
DV
2887 this.rawData_ = ret;
2888
2889 if (annotations.length > 0) {
2890 this.setAnnotations(annotations, true);
2891 }
758a629f 2892};
79420a1e 2893
629a09ae 2894/**
6a1aa64f
DV
2895 * Get the CSV data. If it's in a function, call that function. If it's in a
2896 * file, do an XMLHttpRequest to get it.
2897 * @private
2898 */
285a6bda 2899Dygraph.prototype.start_ = function() {
6a1aa64f 2900 if (typeof this.file_ == 'function') {
285a6bda 2901 // CSV string. Pretend we got it via XHR.
6a1aa64f 2902 this.loadedEvent_(this.file_());
2dda3850 2903 } else if (Dygraph.isArrayLike(this.file_)) {
285a6bda 2904 this.rawData_ = this.parseArray_(this.file_);
26ca7938 2905 this.predraw_();
79420a1e
DV
2906 } else if (typeof this.file_ == 'object' &&
2907 typeof this.file_.getColumnRange == 'function') {
2908 // must be a DataTable from gviz.
a685723c 2909 this.parseDataTable_(this.file_);
26ca7938 2910 this.predraw_();
285a6bda
DV
2911 } else if (typeof this.file_ == 'string') {
2912 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2913 if (this.file_.indexOf('\n') >= 0) {
2914 this.loadedEvent_(this.file_);
2915 } else {
2916 var req = new XMLHttpRequest();
2917 var caller = this;
2918 req.onreadystatechange = function () {
2919 if (req.readyState == 4) {
758a629f
DV
2920 if (req.status === 200 || // Normal http
2921 req.status === 0) { // Chrome w/ --allow-file-access-from-files
285a6bda
DV
2922 caller.loadedEvent_(req.responseText);
2923 }
6a1aa64f 2924 }
285a6bda 2925 };
6a1aa64f 2926
285a6bda
DV
2927 req.open("GET", this.file_, true);
2928 req.send(null);
2929 }
2930 } else {
2931 this.error("Unknown data format: " + (typeof this.file_));
6a1aa64f
DV
2932 }
2933};
2934
2935/**
2936 * Changes various properties of the graph. These can include:
2937 * <ul>
2938 * <li>file: changes the source data for the graph</li>
2939 * <li>errorBars: changes whether the data contains stddev</li>
2940 * </ul>
dcb25130 2941 *
ccfcc169
DV
2942 * There's a huge variety of options that can be passed to this method. For a
2943 * full list, see http://dygraphs.com/options.html.
2944 *
6a1aa64f 2945 * @param {Object} attrs The new properties and values
ccfcc169
DV
2946 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
2947 * call to updateOptions(). If you know better, you can pass true to explicitly
2948 * block the redraw. This can be useful for chaining updateOptions() calls,
2949 * avoiding the occasional infinite loop and preventing redraws when it's not
2950 * necessary (e.g. when updating a callback).
6a1aa64f 2951 */
48e614ac 2952Dygraph.prototype.updateOptions = function(input_attrs, block_redraw) {
ccfcc169
DV
2953 if (typeof(block_redraw) == 'undefined') block_redraw = false;
2954
48e614ac 2955 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
758a629f 2956 var file = input_attrs.file;
48e614ac
DV
2957 var attrs = Dygraph.mapLegacyOptions_(input_attrs);
2958
ccfcc169 2959 // TODO(danvk): this is a mess. Move these options into attr_.
c65f2303 2960 if ('rollPeriod' in attrs) {
6a1aa64f
DV
2961 this.rollPeriod_ = attrs.rollPeriod;
2962 }
c65f2303 2963 if ('dateWindow' in attrs) {
6a1aa64f 2964 this.dateWindow_ = attrs.dateWindow;
e5152598 2965 if (!('isZoomedIgnoreProgrammaticZoom' in attrs)) {
758a629f 2966 this.zoomed_x_ = (attrs.dateWindow !== null);
81856f70 2967 }
b7e5862d 2968 }
e5152598 2969 if ('valueRange' in attrs && !('isZoomedIgnoreProgrammaticZoom' in attrs)) {
758a629f 2970 this.zoomed_y_ = (attrs.valueRange !== null);
6a1aa64f 2971 }
450fe64b
DV
2972
2973 // TODO(danvk): validate per-series options.
46dde5f9
DV
2974 // Supported:
2975 // strokeWidth
2976 // pointSize
2977 // drawPoints
2978 // highlightCircleSize
450fe64b 2979
9ca829f2
DV
2980 // Check if this set options will require new points.
2981 var requiresNewPoints = Dygraph.isPixelChangingOptionList(this.attr_("labels"), attrs);
2982
48e614ac 2983 Dygraph.updateDeep(this.user_attrs_, attrs);
285a6bda 2984
48e614ac
DV
2985 if (file) {
2986 this.file_ = file;
ccfcc169 2987 if (!block_redraw) this.start_();
6a1aa64f 2988 } else {
9ca829f2
DV
2989 if (!block_redraw) {
2990 if (requiresNewPoints) {
48e614ac 2991 this.predraw_();
9ca829f2
DV
2992 } else {
2993 this.renderGraph_(false, false);
2994 }
2995 }
6a1aa64f
DV
2996 }
2997};
2998
2999/**
48e614ac
DV
3000 * Returns a copy of the options with deprecated names converted into current
3001 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3002 * interested in that, they should save a copy before calling this.
3003 * @private
3004 */
3005Dygraph.mapLegacyOptions_ = function(attrs) {
3006 var my_attrs = {};
3007 for (var k in attrs) {
3008 if (k == 'file') continue;
3009 if (attrs.hasOwnProperty(k)) my_attrs[k] = attrs[k];
3010 }
3011
3012 var set = function(axis, opt, value) {
3013 if (!my_attrs.axes) my_attrs.axes = {};
3014 if (!my_attrs.axes[axis]) my_attrs.axes[axis] = {};
3015 my_attrs.axes[axis][opt] = value;
3016 };
3017 var map = function(opt, axis, new_opt) {
3018 if (typeof(attrs[opt]) != 'undefined') {
3019 set(axis, new_opt, attrs[opt]);
3020 delete my_attrs[opt];
3021 }
3022 };
3023
3024 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3025 map('xValueFormatter', 'x', 'valueFormatter');
3026 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3027 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3028 map('xTicker', 'x', 'ticker');
3029 map('yValueFormatter', 'y', 'valueFormatter');
3030 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3031 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3032 map('yTicker', 'y', 'ticker');
3033 return my_attrs;
3034};
3035
3036/**
697e70b2
DV
3037 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3038 * containing div (which has presumably changed size since the dygraph was
3039 * instantiated. If the width/height are specified, the div will be resized.
964f30c6
DV
3040 *
3041 * This is far more efficient than destroying and re-instantiating a
3042 * Dygraph, since it doesn't have to reparse the underlying data.
3043 *
629a09ae
DV
3044 * @param {Number} [width] Width (in pixels)
3045 * @param {Number} [height] Height (in pixels)
697e70b2
DV
3046 */
3047Dygraph.prototype.resize = function(width, height) {
e8c7ef86
DV
3048 if (this.resize_lock) {
3049 return;
3050 }
3051 this.resize_lock = true;
3052
697e70b2
DV
3053 if ((width === null) != (height === null)) {
3054 this.warn("Dygraph.resize() should be called with zero parameters or " +
3055 "two non-NULL parameters. Pretending it was zero.");
3056 width = height = null;
3057 }
3058
4b4d1a63
DV
3059 var old_width = this.width_;
3060 var old_height = this.height_;
b16e6369 3061
697e70b2
DV
3062 if (width) {
3063 this.maindiv_.style.width = width + "px";
3064 this.maindiv_.style.height = height + "px";
3065 this.width_ = width;
3066 this.height_ = height;
3067 } else {
ccd9d7c2
PF
3068 this.width_ = this.maindiv_.clientWidth;
3069 this.height_ = this.maindiv_.clientHeight;
697e70b2
DV
3070 }
3071
4b4d1a63
DV
3072 if (old_width != this.width_ || old_height != this.height_) {
3073 // TODO(danvk): there should be a clear() method.
3074 this.maindiv_.innerHTML = "";
77b5e09d 3075 this.roller_ = null;
4b4d1a63
DV
3076 this.attrs_.labelsDiv = null;
3077 this.createInterface_();
c9faeafd
DV
3078 if (this.annotations_.length) {
3079 // createInterface_ reset the layout, so we need to do this.
3080 this.layout_.setAnnotations(this.annotations_);
3081 }
4b4d1a63
DV
3082 this.predraw_();
3083 }
e8c7ef86
DV
3084
3085 this.resize_lock = false;
697e70b2
DV
3086};
3087
3088/**
6faebb69 3089 * Adjusts the number of points in the rolling average. Updates the graph to
6a1aa64f 3090 * reflect the new averaging period.
6faebb69 3091 * @param {Number} length Number of points over which to average the data.
6a1aa64f 3092 */
285a6bda 3093Dygraph.prototype.adjustRoll = function(length) {
6a1aa64f 3094 this.rollPeriod_ = length;
26ca7938 3095 this.predraw_();
6a1aa64f 3096};
540d00f1 3097
f8cfec73 3098/**
1cf11047
DV
3099 * Returns a boolean array of visibility statuses.
3100 */
3101Dygraph.prototype.visibility = function() {
3102 // Do lazy-initialization, so that this happens after we know the number of
3103 // data series.
3104 if (!this.attr_("visibility")) {
758a629f 3105 this.attrs_.visibility = [];
1cf11047 3106 }
758a629f 3107 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs.
395e98a3 3108 while (this.attr_("visibility").length < this.numColumns() - 1) {
758a629f 3109 this.attrs_.visibility.push(true);
1cf11047
DV
3110 }
3111 return this.attr_("visibility");
3112};
3113
3114/**
3115 * Changes the visiblity of a series.
3116 */
3117Dygraph.prototype.setVisibility = function(num, value) {
3118 var x = this.visibility();
a6c109c1 3119 if (num < 0 || num >= x.length) {
1cf11047
DV
3120 this.warn("invalid series number in setVisibility: " + num);
3121 } else {
3122 x[num] = value;
26ca7938 3123 this.predraw_();
1cf11047
DV
3124 }
3125};
3126
3127/**
0cb9bd91
DV
3128 * How large of an area will the dygraph render itself in?
3129 * This is used for testing.
3130 * @return A {width: w, height: h} object.
3131 * @private
3132 */
3133Dygraph.prototype.size = function() {
3134 return { width: this.width_, height: this.height_ };
3135};
3136
3137/**
5c528fa2 3138 * Update the list of annotations and redraw the chart.
41ee764f
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3139 * See dygraphs.com/annotations.html for more info on how to use annotations.
3140 * @param ann {Array} An array of annotation objects.
3141 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
5c528fa2 3142 */
a685723c 3143Dygraph.prototype.setAnnotations = function(ann, suppressDraw) {
3c51ab74
DV
3144 // Only add the annotation CSS rule once we know it will be used.
3145 Dygraph.addAnnotationRule();
5c528fa2
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3146 this.annotations_ = ann;
3147 this.layout_.setAnnotations(this.annotations_);
a685723c 3148 if (!suppressDraw) {
26ca7938 3149 this.predraw_();
a685723c 3150 }
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3151};
3152
3153/**
3154 * Return the list of annotations.
3155 */
3156Dygraph.prototype.annotations = function() {
3157 return this.annotations_;
3158};
3159
46dde5f9
DV
3160/**
3161 * Get the index of a series (column) given its name. The first column is the
3162 * x-axis, so the data series start with index 1.
3163 */
3164Dygraph.prototype.indexFromSetName = function(name) {
3165 var labels = this.attr_("labels");
3166 for (var i = 0; i < labels.length; i++) {
3167 if (labels[i] == name) return i;
3168 }
3169 return null;
3170};
3171
629a09ae
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3172/**
3173 * @private
3174 * Adds a default style for the annotation CSS classes to the document. This is
3175 * only executed when annotations are actually used. It is designed to only be
3176 * called once -- all calls after the first will return immediately.
3177 */
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3178Dygraph.addAnnotationRule = function() {
3179 if (Dygraph.addedAnnotationCSS) return;
3180
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3181 var rule = "border: 1px solid black; " +
3182 "background-color: white; " +
3183 "text-align: center;";
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3184
3185 var styleSheetElement = document.createElement("style");
3186 styleSheetElement.type = "text/css";
3187 document.getElementsByTagName("head")[0].appendChild(styleSheetElement);
3188
3189 // Find the first style sheet that we can access.
3190 // We may not add a rule to a style sheet from another domain for security
3191 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3192 // adds its own style sheets from google.com.
3193 for (var i = 0; i < document.styleSheets.length; i++) {
3194 if (document.styleSheets[i].disabled) continue;
3195 var mysheet = document.styleSheets[i];
3196 try {
3197 if (mysheet.insertRule) { // Firefox
3198 var idx = mysheet.cssRules ? mysheet.cssRules.length : 0;
3199 mysheet.insertRule(".dygraphDefaultAnnotation { " + rule + " }", idx);
3200 } else if (mysheet.addRule) { // IE
3201 mysheet.addRule(".dygraphDefaultAnnotation", rule);
3202 }
3203 Dygraph.addedAnnotationCSS = true;
3204 return;
3205 } catch(err) {
3206 // Was likely a security exception.
3207 }
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DV
3208 }
3209
22186871 3210 this.warn("Unable to add default annotation CSS rule; display may be off.");
758a629f 3211};
5c528fa2 3212
285a6bda 3213// Older pages may still use this name.
c0f54d4f 3214var DateGraph = Dygraph;