clean up alignment
[dygraphs.git] / dygraph.js
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1// Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
2// All Rights Reserved.
3
4/**
5 * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
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6 * string. Dygraph can handle multiple series with or without error bars. The
7 * date/value ranges will be automatically set. Dygraph uses the
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8 * <canvas> tag, so it only works in FF1.5+.
9 * @author danvdk@gmail.com (Dan Vanderkam)
10
11 Usage:
12 <div id="graphdiv" style="width:800px; height:500px;"></div>
13 <script type="text/javascript">
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14 new Dygraph(document.getElementById("graphdiv"),
15 "datafile.csv", // CSV file with headers
16 { }); // options
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17 </script>
18
19 The CSV file is of the form
20
285a6bda 21 Date,SeriesA,SeriesB,SeriesC
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22 YYYYMMDD,A1,B1,C1
23 YYYYMMDD,A2,B2,C2
24
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25 If the 'errorBars' option is set in the constructor, the input should be of
26 the form
285a6bda 27 Date,SeriesA,SeriesB,...
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28 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
29 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
30
31 If the 'fractions' option is set, the input should be of the form:
32
285a6bda 33 Date,SeriesA,SeriesB,...
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34 YYYYMMDD,A1/B1,A2/B2,...
35 YYYYMMDD,A1/B1,A2/B2,...
36
37 And error bars will be calculated automatically using a binomial distribution.
38
727439b4 39 For further documentation and examples, see http://dygraphs.com/
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40
41 */
42
43/**
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44 * Creates an interactive, zoomable chart.
45 *
46 * @constructor
47 * @param {div | String} div A div or the id of a div into which to construct
48 * the chart.
49 * @param {String | Function} file A file containing CSV data or a function
50 * that returns this data. The most basic expected format for each line is
51 * "YYYY/MM/DD,val1,val2,...". For more information, see
52 * http://dygraphs.com/data.html.
6a1aa64f 53 * @param {Object} attrs Various other attributes, e.g. errorBars determines
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54 * whether the input data contains error ranges. For a complete list of
55 * options, see http://dygraphs.com/options.html.
6a1aa64f 56 */
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57Dygraph = function(div, data, opts) {
58 if (arguments.length > 0) {
59 if (arguments.length == 4) {
60 // Old versions of dygraphs took in the series labels as a constructor
61 // parameter. This doesn't make sense anymore, but it's easy to continue
62 // to support this usage.
63 this.warn("Using deprecated four-argument dygraph constructor");
64 this.__old_init__(div, data, arguments[2], arguments[3]);
65 } else {
66 this.__init__(div, data, opts);
67 }
68 }
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69};
70
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71Dygraph.NAME = "Dygraph";
72Dygraph.VERSION = "1.2";
73Dygraph.__repr__ = function() {
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74 return "[" + this.NAME + " " + this.VERSION + "]";
75};
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76
77/**
78 * Returns information about the Dygraph class.
79 */
285a6bda 80Dygraph.toString = function() {
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81 return this.__repr__();
82};
83
84// Various default values
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85Dygraph.DEFAULT_ROLL_PERIOD = 1;
86Dygraph.DEFAULT_WIDTH = 480;
87Dygraph.DEFAULT_HEIGHT = 320;
6a1aa64f 88
8e4a6af3 89// Default attribute values.
285a6bda 90Dygraph.DEFAULT_ATTRS = {
a9fc39ab 91 highlightCircleSize: 3,
8e4a6af3 92 pixelsPerXLabel: 60,
c6336f04 93 pixelsPerYLabel: 30,
285a6bda 94
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95 labelsDivWidth: 250,
96 labelsDivStyles: {
97 // TODO(danvk): move defaults from createStatusMessage_ here.
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98 },
99 labelsSeparateLines: false,
bcd3ebf0 100 labelsShowZeroValues: true,
285a6bda 101 labelsKMB: false,
afefbcdb 102 labelsKMG2: false,
d160cc3b 103 showLabelsOnHighlight: true,
12e4c741 104
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105 yValueFormatter: function(a,b) { return Dygraph.numberFormatter(a,b); },
106 digitsAfterDecimal: 2,
107 maxNumberWidth: 6,
19589a3e 108 sigFigs: null,
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109
110 strokeWidth: 1.0,
8e4a6af3 111
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112 axisTickSize: 3,
113 axisLabelFontSize: 14,
114 xAxisLabelWidth: 50,
115 yAxisLabelWidth: 50,
bf640e56 116 xAxisLabelFormatter: Dygraph.dateAxisFormatter,
8846615a 117 rightGap: 5,
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118
119 showRoller: false,
120 xValueFormatter: Dygraph.dateString_,
121 xValueParser: Dygraph.dateParser,
122 xTicker: Dygraph.dateTicker,
123
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124 delimiter: ',',
125
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126 sigma: 2.0,
127 errorBars: false,
128 fractions: false,
129 wilsonInterval: true, // only relevant if fractions is true
5954ef32 130 customBars: false,
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131 fillGraph: false,
132 fillAlpha: 0.15,
f032c51d 133 connectSeparatedPoints: false,
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134
135 stackedGraph: false,
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136 hideOverlayOnMouseOut: true,
137
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138 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
139 legend: 'onmouseover', // the only relevant value at the moment is 'always'.
140
00c281d4 141 stepPlot: false,
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142 avoidMinZero: false,
143
ad1798c2 144 // Sizes of the various chart labels.
b4202b3d 145 titleHeight: 28,
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146 xLabelHeight: 18,
147 yLabelWidth: 18,
ad1798c2 148
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149 drawXAxis: true,
150 drawYAxis: true,
151 axisLineColor: "black",
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152 axisLineWidth: 0.3,
153 gridLineWidth: 0.3,
154 axisLabelColor: "black",
155 axisLabelFont: "Arial", // TODO(danvk): is this implemented?
156 axisLabelWidth: 50,
157 drawYGrid: true,
158 drawXGrid: true,
159 gridLineColor: "rgb(128,128,128)",
423f5ed3 160
846f3d2d 161 interactionModel: null // will be set to Dygraph.Interaction.defaultModel
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162};
163
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164// Directions for panning and zooming. Use bit operations when combined
165// values are possible.
166Dygraph.HORIZONTAL = 1;
167Dygraph.VERTICAL = 2;
168
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169// Used for initializing annotation CSS rules only once.
170Dygraph.addedAnnotationCSS = false;
171
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172Dygraph.prototype.__old_init__ = function(div, file, labels, attrs) {
173 // Labels is no longer a constructor parameter, since it's typically set
174 // directly from the data source. It also conains a name for the x-axis,
175 // which the previous constructor form did not.
176 if (labels != null) {
177 var new_labels = ["Date"];
178 for (var i = 0; i < labels.length; i++) new_labels.push(labels[i]);
fc80a396 179 Dygraph.update(attrs, { 'labels': new_labels });
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180 }
181 this.__init__(div, file, attrs);
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182};
183
6a1aa64f 184/**
285a6bda 185 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
7aedf6fe 186 * and context &lt;canvas&gt; inside of it. See the constructor for details.
6a1aa64f 187 * on the parameters.
12e4c741 188 * @param {Element} div the Element to render the graph into.
6a1aa64f 189 * @param {String | Function} file Source data
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190 * @param {Object} attrs Miscellaneous other options
191 * @private
192 */
285a6bda 193Dygraph.prototype.__init__ = function(div, file, attrs) {
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194 // Hack for IE: if we're using excanvas and the document hasn't finished
195 // loading yet (and hence may not have initialized whatever it needs to
196 // initialize), then keep calling this routine periodically until it has.
197 if (/MSIE/.test(navigator.userAgent) && !window.opera &&
198 typeof(G_vmlCanvasManager) != 'undefined' &&
199 document.readyState != 'complete') {
200 var self = this;
201 setTimeout(function() { self.__init__(div, file, attrs) }, 100);
202 }
203
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204 // Support two-argument constructor
205 if (attrs == null) { attrs = {}; }
206
6a1aa64f 207 // Copy the important bits into the object
32988383 208 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
6a1aa64f 209 this.maindiv_ = div;
6a1aa64f 210 this.file_ = file;
285a6bda 211 this.rollPeriod_ = attrs.rollPeriod || Dygraph.DEFAULT_ROLL_PERIOD;
6a1aa64f 212 this.previousVerticalX_ = -1;
6a1aa64f 213 this.fractions_ = attrs.fractions || false;
6a1aa64f 214 this.dateWindow_ = attrs.dateWindow || null;
8b83c6cc 215
6a1aa64f 216 this.wilsonInterval_ = attrs.wilsonInterval || true;
fe0b7c03 217 this.is_initial_draw_ = true;
5c528fa2 218 this.annotations_ = [];
7aedf6fe 219
45f2c689 220 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
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221 this.zoomed_x_ = false;
222 this.zoomed_y_ = false;
45f2c689 223
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224 // Clear the div. This ensure that, if multiple dygraphs are passed the same
225 // div, then only one will be drawn.
226 div.innerHTML = "";
227
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228 // For historical reasons, the 'width' and 'height' options trump all CSS
229 // rules _except_ for an explicit 'width' or 'height' on the div.
230 // As an added convenience, if the div has zero height (like <div></div> does
231 // without any styles), then we use a default height/width.
232 if (div.style.width == '' && attrs.width) {
233 div.style.width = attrs.width + "px";
285a6bda 234 }
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235 if (div.style.height == '' && attrs.height) {
236 div.style.height = attrs.height + "px";
32988383 237 }
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238 if (div.offsetHeight == 0) {
239 div.style.height = Dygraph.DEFAULT_HEIGHT + "px";
240 if (div.style.width == '') {
241 div.style.width = Dygraph.DEFAULT_WIDTH + "px";
242 }
c21d2c2d 243 }
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244 this.width_ = div.offsetWidth;
245 this.height_ = div.offsetHeight;
32988383 246
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247 if (this.width_ == 0) {
248 this.error("dygraph has zero width. Please specify a width in pixels.");
249 }
250 if (this.height_ == 0) {
251 this.error("dygraph has zero height. Please specify a height in pixels.");
252 }
253
344ba8c0 254 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
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255 if (attrs['stackedGraph']) {
256 attrs['fillGraph'] = true;
257 // TODO(nikhilk): Add any other stackedGraph checks here.
258 }
259
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260 // Dygraphs has many options, some of which interact with one another.
261 // To keep track of everything, we maintain two sets of options:
262 //
c21d2c2d 263 // this.user_attrs_ only options explicitly set by the user.
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264 // this.attrs_ defaults, options derived from user_attrs_, data.
265 //
266 // Options are then accessed this.attr_('attr'), which first looks at
267 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
268 // defaults without overriding behavior that the user specifically asks for.
269 this.user_attrs_ = {};
fc80a396 270 Dygraph.update(this.user_attrs_, attrs);
6a1aa64f 271
285a6bda 272 this.attrs_ = {};
fc80a396 273 Dygraph.update(this.attrs_, Dygraph.DEFAULT_ATTRS);
6a1aa64f 274
16269f6e 275 this.boundaryIds_ = [];
6a1aa64f 276
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277 // Create the containing DIV and other interactive elements
278 this.createInterface_();
279
738fc797 280 this.start_();
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281};
282
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283/**
284 * Returns the zoomed status of the chart for one or both axes.
285 *
286 * Axis is an optional parameter. Can be set to 'x' or 'y'.
287 *
288 * The zoomed status for an axis is set whenever a user zooms using the mouse
e5152598 289 * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom
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290 * option is also specified).
291 */
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292Dygraph.prototype.isZoomed = function(axis) {
293 if (axis == null) return this.zoomed_x_ || this.zoomed_y_;
294 if (axis == 'x') return this.zoomed_x_;
295 if (axis == 'y') return this.zoomed_y_;
296 throw "axis parameter to Dygraph.isZoomed must be missing, 'x' or 'y'.";
297};
298
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299/**
300 * Returns information about the Dygraph object, including its containing ID.
301 */
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302Dygraph.prototype.toString = function() {
303 var maindiv = this.maindiv_;
304 var id = (maindiv && maindiv.id) ? maindiv.id : maindiv
305 return "[Dygraph " + id + "]";
306}
307
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308/**
309 * @private
310 * Returns the value of an option. This may be set by the user (either in the
311 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
312 * per-series value.
313 * @param { String } name The name of the option, e.g. 'rollPeriod'.
314 * @param { String } [seriesName] The name of the series to which the option
315 * will be applied. If no per-series value of this option is available, then
316 * the global value is returned. This is optional.
317 * @return { ... } The value of the option.
318 */
227b93cc 319Dygraph.prototype.attr_ = function(name, seriesName) {
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320// <REMOVE_FOR_COMBINED>
321 if (typeof(Dygraph.OPTIONS_REFERENCE) === 'undefined') {
322 this.error('Must include options reference JS for testing');
323 } else if (!Dygraph.OPTIONS_REFERENCE.hasOwnProperty(name)) {
324 this.error('Dygraphs is using property ' + name + ', which has no entry ' +
325 'in the Dygraphs.OPTIONS_REFERENCE listing.');
326 // Only log this error once.
327 Dygraph.OPTIONS_REFERENCE[name] = true;
328 }
329// </REMOVE_FOR_COMBINED>
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330 if (seriesName &&
331 typeof(this.user_attrs_[seriesName]) != 'undefined' &&
332 this.user_attrs_[seriesName] != null &&
333 typeof(this.user_attrs_[seriesName][name]) != 'undefined') {
334 return this.user_attrs_[seriesName][name];
450fe64b 335 } else if (typeof(this.user_attrs_[name]) != 'undefined') {
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336 return this.user_attrs_[name];
337 } else if (typeof(this.attrs_[name]) != 'undefined') {
338 return this.attrs_[name];
339 } else {
340 return null;
341 }
342};
343
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344/**
345 * Returns the current rolling period, as set by the user or an option.
6faebb69 346 * @return {Number} The number of points in the rolling window
6a1aa64f 347 */
285a6bda 348Dygraph.prototype.rollPeriod = function() {
6a1aa64f 349 return this.rollPeriod_;
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350};
351
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352/**
353 * Returns the currently-visible x-range. This can be affected by zooming,
354 * panning or a call to updateOptions.
355 * Returns a two-element array: [left, right].
356 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
357 */
358Dygraph.prototype.xAxisRange = function() {
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359 return this.dateWindow_ ? this.dateWindow_ : this.xAxisExtremes();
360};
599fb4ad 361
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362/**
363 * Returns the lower- and upper-bound x-axis values of the
364 * data set.
365 */
366Dygraph.prototype.xAxisExtremes = function() {
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367 var left = this.rawData_[0][0];
368 var right = this.rawData_[this.rawData_.length - 1][0];
369 return [left, right];
370};
371
3230c662 372/**
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373 * Returns the currently-visible y-range for an axis. This can be affected by
374 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
375 * called with no arguments, returns the range of the first axis.
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376 * Returns a two-element array: [bottom, top].
377 */
d58ae307 378Dygraph.prototype.yAxisRange = function(idx) {
d63e6799 379 if (typeof(idx) == "undefined") idx = 0;
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380 if (idx < 0 || idx >= this.axes_.length) {
381 return null;
382 }
383 var axis = this.axes_[idx];
384 return [ axis.computedValueRange[0], axis.computedValueRange[1] ];
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385};
386
387/**
388 * Returns the currently-visible y-ranges for each axis. This can be affected by
389 * zooming, panning, calls to updateOptions, etc.
390 * Returns an array of [bottom, top] pairs, one for each y-axis.
391 */
392Dygraph.prototype.yAxisRanges = function() {
393 var ret = [];
394 for (var i = 0; i < this.axes_.length; i++) {
395 ret.push(this.yAxisRange(i));
396 }
397 return ret;
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398};
399
d58ae307 400// TODO(danvk): use these functions throughout dygraphs.
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401/**
402 * Convert from data coordinates to canvas/div X/Y coordinates.
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403 * If specified, do this conversion for the coordinate system of a particular
404 * axis. Uses the first axis by default.
3230c662 405 * Returns a two-element array: [X, Y]
ff022deb 406 *
0747928a 407 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
ff022deb 408 * instead of toDomCoords(null, y, axis).
3230c662 409 */
d58ae307 410Dygraph.prototype.toDomCoords = function(x, y, axis) {
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411 return [ this.toDomXCoord(x), this.toDomYCoord(y, axis) ];
412};
413
414/**
415 * Convert from data x coordinates to canvas/div X coordinate.
416 * If specified, do this conversion for the coordinate system of a particular
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417 * axis.
418 * Returns a single value or null if x is null.
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419 */
420Dygraph.prototype.toDomXCoord = function(x) {
421 if (x == null) {
422 return null;
423 };
424
3230c662 425 var area = this.plotter_.area;
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426 var xRange = this.xAxisRange();
427 return area.x + (x - xRange[0]) / (xRange[1] - xRange[0]) * area.w;
428}
3230c662 429
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430/**
431 * Convert from data x coordinates to canvas/div Y coordinate and optional
432 * axis. Uses the first axis by default.
433 *
434 * returns a single value or null if y is null.
435 */
436Dygraph.prototype.toDomYCoord = function(y, axis) {
0747928a 437 var pct = this.toPercentYCoord(y, axis);
3230c662 438
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439 if (pct == null) {
440 return null;
441 }
e4416fb9 442 var area = this.plotter_.area;
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443 return area.y + pct * area.h;
444}
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445
446/**
447 * Convert from canvas/div coords to data coordinates.
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448 * If specified, do this conversion for the coordinate system of a particular
449 * axis. Uses the first axis by default.
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450 * Returns a two-element array: [X, Y].
451 *
0747928a 452 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
ff022deb 453 * instead of toDataCoords(null, y, axis).
3230c662 454 */
d58ae307 455Dygraph.prototype.toDataCoords = function(x, y, axis) {
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456 return [ this.toDataXCoord(x), this.toDataYCoord(y, axis) ];
457};
458
459/**
460 * Convert from canvas/div x coordinate to data coordinate.
461 *
462 * If x is null, this returns null.
463 */
464Dygraph.prototype.toDataXCoord = function(x) {
465 if (x == null) {
466 return null;
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467 }
468
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469 var area = this.plotter_.area;
470 var xRange = this.xAxisRange();
471 return xRange[0] + (x - area.x) / area.w * (xRange[1] - xRange[0]);
472};
473
474/**
475 * Convert from canvas/div y coord to value.
476 *
477 * If y is null, this returns null.
478 * if axis is null, this uses the first axis.
479 */
480Dygraph.prototype.toDataYCoord = function(y, axis) {
481 if (y == null) {
482 return null;
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483 }
484
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485 var area = this.plotter_.area;
486 var yRange = this.yAxisRange(axis);
487
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488 if (typeof(axis) == "undefined") axis = 0;
489 if (!this.axes_[axis].logscale) {
d9816e62 490 return yRange[0] + (area.y + area.h - y) / area.h * (yRange[1] - yRange[0]);
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491 } else {
492 // Computing the inverse of toDomCoord.
493 var pct = (y - area.y) / area.h
494
495 // Computing the inverse of toPercentYCoord. The function was arrived at with
496 // the following steps:
497 //
498 // Original calcuation:
d59b6f34 499 // pct = (logr1 - Dygraph.log10(y)) / (logr1 - Dygraph.log10(yRange[0]));
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500 //
501 // Move denominator to both sides:
d59b6f34 502 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
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503 //
504 // subtract logr1, and take the negative value.
d59b6f34 505 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
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506 //
507 // Swap both sides of the equation, and we can compute the log of the
508 // return value. Which means we just need to use that as the exponent in
509 // e^exponent.
d59b6f34 510 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
ff022deb 511
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512 var logr1 = Dygraph.log10(yRange[1]);
513 var exponent = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
514 var value = Math.pow(Dygraph.LOG_SCALE, exponent);
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515 return value;
516 }
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517};
518
e99fde05 519/**
ff022deb 520 * Converts a y for an axis to a percentage from the top to the
4cac8c7a 521 * bottom of the drawing area.
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522 *
523 * If the coordinate represents a value visible on the canvas, then
524 * the value will be between 0 and 1, where 0 is the top of the canvas.
525 * However, this method will return values outside the range, as
526 * values can fall outside the canvas.
527 *
528 * If y is null, this returns null.
529 * if axis is null, this uses the first axis.
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530 *
531 * @param { Number } y The data y-coordinate.
532 * @param { Number } [axis] The axis number on which the data coordinate lives.
533 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
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534 */
535Dygraph.prototype.toPercentYCoord = function(y, axis) {
536 if (y == null) {
537 return null;
538 }
7d0e7a0d 539 if (typeof(axis) == "undefined") axis = 0;
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540
541 var area = this.plotter_.area;
542 var yRange = this.yAxisRange(axis);
543
544 var pct;
7d0e7a0d 545 if (!this.axes_[axis].logscale) {
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546 // yRange[1] - y is unit distance from the bottom.
547 // yRange[1] - yRange[0] is the scale of the range.
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548 // (yRange[1] - y) / (yRange[1] - yRange[0]) is the % from the bottom.
549 pct = (yRange[1] - y) / (yRange[1] - yRange[0]);
550 } else {
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551 var logr1 = Dygraph.log10(yRange[1]);
552 pct = (logr1 - Dygraph.log10(y)) / (logr1 - Dygraph.log10(yRange[0]));
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553 }
554 return pct;
555}
556
557/**
4cac8c7a
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558 * Converts an x value to a percentage from the left to the right of
559 * the drawing area.
560 *
561 * If the coordinate represents a value visible on the canvas, then
562 * the value will be between 0 and 1, where 0 is the left of the canvas.
563 * However, this method will return values outside the range, as
564 * values can fall outside the canvas.
565 *
566 * If x is null, this returns null.
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567 * @param { Number } x The data x-coordinate.
568 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
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569 */
570Dygraph.prototype.toPercentXCoord = function(x) {
571 if (x == null) {
572 return null;
573 }
574
4cac8c7a 575 var xRange = this.xAxisRange();
965a030e 576 return (x - xRange[0]) / (xRange[1] - xRange[0]);
629a09ae 577};
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578
579/**
e99fde05 580 * Returns the number of columns (including the independent variable).
629a09ae 581 * @return { Integer } The number of columns.
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582 */
583Dygraph.prototype.numColumns = function() {
584 return this.rawData_[0].length;
585};
586
587/**
588 * Returns the number of rows (excluding any header/label row).
629a09ae 589 * @return { Integer } The number of rows, less any header.
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590 */
591Dygraph.prototype.numRows = function() {
592 return this.rawData_.length;
593};
594
595/**
596 * Returns the value in the given row and column. If the row and column exceed
597 * the bounds on the data, returns null. Also returns null if the value is
598 * missing.
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599 * @param { Number} row The row number of the data (0-based). Row 0 is the
600 * first row of data, not a header row.
601 * @param { Number} col The column number of the data (0-based)
602 * @return { Number } The value in the specified cell or null if the row/col
603 * were out of range.
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604 */
605Dygraph.prototype.getValue = function(row, col) {
606 if (row < 0 || row > this.rawData_.length) return null;
607 if (col < 0 || col > this.rawData_[row].length) return null;
608
609 return this.rawData_[row][col];
610};
611
629a09ae 612/**
285a6bda 613 * Generates interface elements for the Dygraph: a containing div, a div to
6a1aa64f 614 * display the current point, and a textbox to adjust the rolling average
697e70b2 615 * period. Also creates the Renderer/Layout elements.
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616 * @private
617 */
285a6bda 618Dygraph.prototype.createInterface_ = function() {
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619 // Create the all-enclosing graph div
620 var enclosing = this.maindiv_;
621
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622 this.graphDiv = document.createElement("div");
623 this.graphDiv.style.width = this.width_ + "px";
624 this.graphDiv.style.height = this.height_ + "px";
625 enclosing.appendChild(this.graphDiv);
626
627 // Create the canvas for interactive parts of the chart.
f8cfec73 628 this.canvas_ = Dygraph.createCanvas();
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629 this.canvas_.style.position = "absolute";
630 this.canvas_.width = this.width_;
631 this.canvas_.height = this.height_;
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632 this.canvas_.style.width = this.width_ + "px"; // for IE
633 this.canvas_.style.height = this.height_ + "px"; // for IE
b0c3b730 634
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635 this.canvas_ctx_ = Dygraph.getContext(this.canvas_);
636
b0c3b730 637 // ... and for static parts of the chart.
6a1aa64f 638 this.hidden_ = this.createPlotKitCanvas_(this.canvas_);
2cf95fff 639 this.hidden_ctx_ = Dygraph.getContext(this.hidden_);
76171648 640
eb7bf005
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641 // The interactive parts of the graph are drawn on top of the chart.
642 this.graphDiv.appendChild(this.hidden_);
643 this.graphDiv.appendChild(this.canvas_);
644 this.mouseEventElement_ = this.canvas_;
645
76171648 646 var dygraph = this;
eb7bf005 647 Dygraph.addEvent(this.mouseEventElement_, 'mousemove', function(e) {
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648 dygraph.mouseMove_(e);
649 });
eb7bf005 650 Dygraph.addEvent(this.mouseEventElement_, 'mouseout', function(e) {
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651 dygraph.mouseOut_(e);
652 });
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653
654 // Create the grapher
b2c9222a 655 this.layout_ = new DygraphLayout(this);
697e70b2 656
697e70b2 657 this.createStatusMessage_();
697e70b2 658 this.createDragInterface_();
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659};
660
661/**
662 * Detach DOM elements in the dygraph and null out all data references.
663 * Calling this when you're done with a dygraph can dramatically reduce memory
664 * usage. See, e.g., the tests/perf.html example.
665 */
666Dygraph.prototype.destroy = function() {
667 var removeRecursive = function(node) {
668 while (node.hasChildNodes()) {
669 removeRecursive(node.firstChild);
670 node.removeChild(node.firstChild);
671 }
672 };
673 removeRecursive(this.maindiv_);
674
675 var nullOut = function(obj) {
676 for (var n in obj) {
677 if (typeof(obj[n]) === 'object') {
678 obj[n] = null;
679 }
680 }
681 };
682
683 // These may not all be necessary, but it can't hurt...
684 nullOut(this.layout_);
685 nullOut(this.plotter_);
686 nullOut(this);
687};
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688
689/**
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690 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
691 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
692 * or the zoom rectangles) is done on this.canvas_.
8846615a 693 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
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694 * @return {Object} The newly-created canvas
695 * @private
696 */
285a6bda 697Dygraph.prototype.createPlotKitCanvas_ = function(canvas) {
f8cfec73 698 var h = Dygraph.createCanvas();
6a1aa64f 699 h.style.position = "absolute";
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700 // TODO(danvk): h should be offset from canvas. canvas needs to include
701 // some extra area to make it easier to zoom in on the far left and far
702 // right. h needs to be precisely the plot area, so that clipping occurs.
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703 h.style.top = canvas.style.top;
704 h.style.left = canvas.style.left;
705 h.width = this.width_;
706 h.height = this.height_;
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707 h.style.width = this.width_ + "px"; // for IE
708 h.style.height = this.height_ + "px"; // for IE
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709 return h;
710};
711
629a09ae 712/**
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713 * Generate a set of distinct colors for the data series. This is done with a
714 * color wheel. Saturation/Value are customizable, and the hue is
715 * equally-spaced around the color wheel. If a custom set of colors is
716 * specified, that is used instead.
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717 * @private
718 */
285a6bda 719Dygraph.prototype.setColors_ = function() {
285a6bda 720 var num = this.attr_("labels").length - 1;
6a1aa64f 721 this.colors_ = [];
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722 var colors = this.attr_('colors');
723 if (!colors) {
724 var sat = this.attr_('colorSaturation') || 1.0;
725 var val = this.attr_('colorValue') || 0.5;
2aa21213 726 var half = Math.ceil(num / 2);
6a1aa64f 727 for (var i = 1; i <= num; i++) {
ec1959eb 728 if (!this.visibility()[i-1]) continue;
43af96e7 729 // alternate colors for high contrast.
2aa21213 730 var idx = i % 2 ? Math.ceil(i / 2) : (half + i / 2);
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731 var hue = (1.0 * idx/ (1 + num));
732 this.colors_.push(Dygraph.hsvToRGB(hue, sat, val));
6a1aa64f
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733 }
734 } else {
735 for (var i = 0; i < num; i++) {
ec1959eb 736 if (!this.visibility()[i]) continue;
285a6bda 737 var colorStr = colors[i % colors.length];
f474c2a3 738 this.colors_.push(colorStr);
6a1aa64f
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739 }
740 }
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741
742 this.plotter_.setColors(this.colors_);
629a09ae 743};
6a1aa64f 744
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745/**
746 * Return the list of colors. This is either the list of colors passed in the
629a09ae 747 * attributes or the autogenerated list of rgb(r,g,b) strings.
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748 * @return {Array<string>} The list of colors.
749 */
750Dygraph.prototype.getColors = function() {
751 return this.colors_;
752};
753
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754/**
755 * Create the div that contains information on the selected point(s)
756 * This goes in the top right of the canvas, unless an external div has already
757 * been specified.
758 * @private
759 */
fedbd797 760Dygraph.prototype.createStatusMessage_ = function() {
761 var userLabelsDiv = this.user_attrs_["labelsDiv"];
762 if (userLabelsDiv && null != userLabelsDiv
763 && (typeof(userLabelsDiv) == "string" || userLabelsDiv instanceof String)) {
764 this.user_attrs_["labelsDiv"] = document.getElementById(userLabelsDiv);
765 }
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766 if (!this.attr_("labelsDiv")) {
767 var divWidth = this.attr_('labelsDivWidth');
b0c3b730 768 var messagestyle = {
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769 "position": "absolute",
770 "fontSize": "14px",
771 "zIndex": 10,
772 "width": divWidth + "px",
773 "top": "0px",
8846615a 774 "left": (this.width_ - divWidth - 2) + "px",
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775 "background": "white",
776 "textAlign": "left",
b0c3b730 777 "overflow": "hidden"};
fc80a396 778 Dygraph.update(messagestyle, this.attr_('labelsDivStyles'));
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779 var div = document.createElement("div");
780 for (var name in messagestyle) {
85b99f0b
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781 if (messagestyle.hasOwnProperty(name)) {
782 div.style[name] = messagestyle[name];
783 }
b0c3b730
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784 }
785 this.graphDiv.appendChild(div);
285a6bda 786 this.attrs_.labelsDiv = div;
6a1aa64f
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787 }
788};
789
790/**
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791 * Position the labels div so that:
792 * - its right edge is flush with the right edge of the charting area
793 * - its top edge is flush with the top edge of the charting area
629a09ae 794 * @private
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795 */
796Dygraph.prototype.positionLabelsDiv_ = function() {
797 // Don't touch a user-specified labelsDiv.
798 if (this.user_attrs_.hasOwnProperty("labelsDiv")) return;
799
800 var area = this.plotter_.area;
801 var div = this.attr_("labelsDiv");
8c21adcf 802 div.style.left = area.x + area.w - this.attr_("labelsDivWidth") - 1 + "px";
ad1798c2 803 div.style.top = area.y + "px";
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804};
805
806/**
6a1aa64f 807 * Create the text box to adjust the averaging period
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808 * @private
809 */
285a6bda 810Dygraph.prototype.createRollInterface_ = function() {
8c69de65
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811 // Create a roller if one doesn't exist already.
812 if (!this.roller_) {
813 this.roller_ = document.createElement("input");
814 this.roller_.type = "text";
815 this.roller_.style.display = "none";
816 this.graphDiv.appendChild(this.roller_);
817 }
818
819 var display = this.attr_('showRoller') ? 'block' : 'none';
26ca7938 820
0c38f187 821 var area = this.plotter_.area;
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822 var textAttr = { "position": "absolute",
823 "zIndex": 10,
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824 "top": (area.y + area.h - 25) + "px",
825 "left": (area.x + 1) + "px",
b0c3b730 826 "display": display
6a1aa64f 827 };
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828 this.roller_.size = "2";
829 this.roller_.value = this.rollPeriod_;
b0c3b730 830 for (var name in textAttr) {
85b99f0b 831 if (textAttr.hasOwnProperty(name)) {
8c69de65 832 this.roller_.style[name] = textAttr[name];
85b99f0b 833 }
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834 }
835
76171648 836 var dygraph = this;
8c69de65 837 this.roller_.onchange = function() { dygraph.adjustRoll(dygraph.roller_.value); };
76171648
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838};
839
629a09ae
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840/**
841 * @private
629a09ae
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842 * Converts page the x-coordinate of the event to pixel x-coordinates on the
843 * canvas (i.e. DOM Coords).
844 */
062ef401
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845Dygraph.prototype.dragGetX_ = function(e, context) {
846 return Dygraph.pageX(e) - context.px
847};
bce01b0f 848
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849/**
850 * @private
851 * Converts page the y-coordinate of the event to pixel y-coordinates on the
852 * canvas (i.e. DOM Coords).
853 */
062ef401
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854Dygraph.prototype.dragGetY_ = function(e, context) {
855 return Dygraph.pageY(e) - context.py
856};
ee672584 857
629a09ae 858/**
062ef401
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859 * Set up all the mouse handlers needed to capture dragging behavior for zoom
860 * events.
861 * @private
862 */
863Dygraph.prototype.createDragInterface_ = function() {
864 var context = {
865 // Tracks whether the mouse is down right now
866 isZooming: false,
867 isPanning: false, // is this drag part of a pan?
868 is2DPan: false, // if so, is that pan 1- or 2-dimensional?
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869 dragStartX: null, // pixel coordinates
870 dragStartY: null, // pixel coordinates
871 dragEndX: null, // pixel coordinates
872 dragEndY: null, // pixel coordinates
062ef401 873 dragDirection: null,
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874 prevEndX: null, // pixel coordinates
875 prevEndY: null, // pixel coordinates
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876 prevDragDirection: null,
877
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878 // The value on the left side of the graph when a pan operation starts.
879 initialLeftmostDate: null,
880
881 // The number of units each pixel spans. (This won't be valid for log
882 // scales)
883 xUnitsPerPixel: null,
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884
885 // TODO(danvk): update this comment
886 // The range in second/value units that the viewport encompasses during a
887 // panning operation.
888 dateRange: null,
889
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890 // Top-left corner of the canvas, in DOM coords
891 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
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892 px: 0,
893 py: 0,
894
965a030e 895 // Values for use with panEdgeFraction, which limit how far outside the
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896 // graph's data boundaries it can be panned.
897 boundedDates: null, // [minDate, maxDate]
898 boundedValues: null, // [[minValue, maxValue] ...]
899
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900 initializeMouseDown: function(event, g, context) {
901 // prevents mouse drags from selecting page text.
902 if (event.preventDefault) {
903 event.preventDefault(); // Firefox, Chrome, etc.
6a1aa64f 904 } else {
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905 event.returnValue = false; // IE
906 event.cancelBubble = true;
6a1aa64f
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907 }
908
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909 context.px = Dygraph.findPosX(g.canvas_);
910 context.py = Dygraph.findPosY(g.canvas_);
911 context.dragStartX = g.dragGetX_(event, context);
912 context.dragStartY = g.dragGetY_(event, context);
6a1aa64f 913 }
062ef401 914 };
2b188b3d 915
062ef401 916 var interactionModel = this.attr_("interactionModel");
8b83c6cc 917
062ef401
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918 // Self is the graph.
919 var self = this;
6faebb69 920
062ef401
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921 // Function that binds the graph and context to the handler.
922 var bindHandler = function(handler) {
923 return function(event) {
924 handler(event, self, context);
925 };
926 };
927
928 for (var eventName in interactionModel) {
929 if (!interactionModel.hasOwnProperty(eventName)) continue;
930 Dygraph.addEvent(this.mouseEventElement_, eventName,
931 bindHandler(interactionModel[eventName]));
932 }
933
934 // If the user releases the mouse button during a drag, but not over the
935 // canvas, then it doesn't count as a zooming action.
936 Dygraph.addEvent(document, 'mouseup', function(event) {
937 if (context.isZooming || context.isPanning) {
938 context.isZooming = false;
939 context.dragStartX = null;
940 context.dragStartY = null;
941 }
942
943 if (context.isPanning) {
944 context.isPanning = false;
945 context.draggingDate = null;
946 context.dateRange = null;
947 for (var i = 0; i < self.axes_.length; i++) {
948 delete self.axes_[i].draggingValue;
949 delete self.axes_[i].dragValueRange;
950 }
951 }
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952 });
953};
954
062ef401 955
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956/**
957 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
958 * up any previous zoom rectangles that were drawn. This could be optimized to
959 * avoid extra redrawing, but it's tricky to avoid interactions with the status
960 * dots.
8b83c6cc 961 *
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962 * @param {Number} direction the direction of the zoom rectangle. Acceptable
963 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
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964 * @param {Number} startX The X position where the drag started, in canvas
965 * coordinates.
966 * @param {Number} endX The current X position of the drag, in canvas coords.
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967 * @param {Number} startY The Y position where the drag started, in canvas
968 * coordinates.
969 * @param {Number} endY The current Y position of the drag, in canvas coords.
39b0e098 970 * @param {Number} prevDirection the value of direction on the previous call to
8b83c6cc 971 * this function. Used to avoid excess redrawing
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972 * @param {Number} prevEndX The value of endX on the previous call to this
973 * function. Used to avoid excess redrawing
8b83c6cc
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974 * @param {Number} prevEndY The value of endY on the previous call to this
975 * function. Used to avoid excess redrawing
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976 * @private
977 */
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978Dygraph.prototype.drawZoomRect_ = function(direction, startX, endX, startY,
979 endY, prevDirection, prevEndX,
980 prevEndY) {
2cf95fff 981 var ctx = this.canvas_ctx_;
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982
983 // Clean up from the previous rect if necessary
39b0e098 984 if (prevDirection == Dygraph.HORIZONTAL) {
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985 ctx.clearRect(Math.min(startX, prevEndX), 0,
986 Math.abs(startX - prevEndX), this.height_);
39b0e098 987 } else if (prevDirection == Dygraph.VERTICAL){
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988 ctx.clearRect(0, Math.min(startY, prevEndY),
989 this.width_, Math.abs(startY - prevEndY));
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990 }
991
992 // Draw a light-grey rectangle to show the new viewing area
39b0e098 993 if (direction == Dygraph.HORIZONTAL) {
8b83c6cc
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994 if (endX && startX) {
995 ctx.fillStyle = "rgba(128,128,128,0.33)";
996 ctx.fillRect(Math.min(startX, endX), 0,
997 Math.abs(endX - startX), this.height_);
998 }
999 }
39b0e098 1000 if (direction == Dygraph.VERTICAL) {
8b83c6cc
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1001 if (endY && startY) {
1002 ctx.fillStyle = "rgba(128,128,128,0.33)";
1003 ctx.fillRect(0, Math.min(startY, endY),
1004 this.width_, Math.abs(endY - startY));
1005 }
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1006 }
1007};
1008
1009/**
8b83c6cc
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1010 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1011 * the canvas. The exact zoom window may be slightly larger if there are no data
1012 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1013 * which accepts dates that match the raw data. This function redraws the graph.
d58ae307 1014 *
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1015 * @param {Number} lowX The leftmost pixel value that should be visible.
1016 * @param {Number} highX The rightmost pixel value that should be visible.
1017 * @private
1018 */
8b83c6cc 1019Dygraph.prototype.doZoomX_ = function(lowX, highX) {
6a1aa64f 1020 // Find the earliest and latest dates contained in this canvasx range.
8b83c6cc 1021 // Convert the call to date ranges of the raw data.
ff022deb
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1022 var minDate = this.toDataXCoord(lowX);
1023 var maxDate = this.toDataXCoord(highX);
8b83c6cc
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1024 this.doZoomXDates_(minDate, maxDate);
1025};
6a1aa64f 1026
8b83c6cc
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1027/**
1028 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1029 * method with doZoomX which accepts pixel coordinates. This function redraws
1030 * the graph.
d58ae307 1031 *
8b83c6cc
RK
1032 * @param {Number} minDate The minimum date that should be visible.
1033 * @param {Number} maxDate The maximum date that should be visible.
1034 * @private
1035 */
1036Dygraph.prototype.doZoomXDates_ = function(minDate, maxDate) {
6a1aa64f 1037 this.dateWindow_ = [minDate, maxDate];
57baab03 1038 this.zoomed_x_ = true;
26ca7938 1039 this.drawGraph_();
285a6bda 1040 if (this.attr_("zoomCallback")) {
ac139d19 1041 this.attr_("zoomCallback")(minDate, maxDate, this.yAxisRanges());
8b83c6cc
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1042 }
1043};
1044
1045/**
1046 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
d58ae307
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1047 * the canvas. This function redraws the graph.
1048 *
8b83c6cc
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1049 * @param {Number} lowY The topmost pixel value that should be visible.
1050 * @param {Number} highY The lowest pixel value that should be visible.
1051 * @private
1052 */
1053Dygraph.prototype.doZoomY_ = function(lowY, highY) {
d58ae307
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1054 // Find the highest and lowest values in pixel range for each axis.
1055 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1056 // This is because pixels increase as you go down on the screen, whereas data
1057 // coordinates increase as you go up the screen.
1058 var valueRanges = [];
1059 for (var i = 0; i < this.axes_.length; i++) {
ff022deb
RK
1060 var hi = this.toDataYCoord(lowY, i);
1061 var low = this.toDataYCoord(highY, i);
1062 this.axes_[i].valueWindow = [low, hi];
1063 valueRanges.push([low, hi]);
d58ae307 1064 }
8b83c6cc 1065
57baab03 1066 this.zoomed_y_ = true;
66c380c4 1067 this.drawGraph_();
8b83c6cc 1068 if (this.attr_("zoomCallback")) {
d58ae307 1069 var xRange = this.xAxisRange();
45f2c689 1070 var yRange = this.yAxisRange();
d58ae307 1071 this.attr_("zoomCallback")(xRange[0], xRange[1], this.yAxisRanges());
8b83c6cc
RK
1072 }
1073};
1074
1075/**
1076 * Reset the zoom to the original view coordinates. This is the same as
1077 * double-clicking on the graph.
d58ae307 1078 *
8b83c6cc
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1079 * @private
1080 */
1081Dygraph.prototype.doUnzoom_ = function() {
d58ae307 1082 var dirty = false;
8b83c6cc 1083 if (this.dateWindow_ != null) {
d58ae307 1084 dirty = true;
8b83c6cc
RK
1085 this.dateWindow_ = null;
1086 }
d58ae307
DV
1087
1088 for (var i = 0; i < this.axes_.length; i++) {
1089 if (this.axes_[i].valueWindow != null) {
1090 dirty = true;
1091 delete this.axes_[i].valueWindow;
1092 }
8b83c6cc
RK
1093 }
1094
da1369a5
DV
1095 // Clear any selection, since it's likely to be drawn in the wrong place.
1096 this.clearSelection();
1097
8b83c6cc 1098 if (dirty) {
437c0979
RK
1099 // Putting the drawing operation before the callback because it resets
1100 // yAxisRange.
57baab03
NN
1101 this.zoomed_x_ = false;
1102 this.zoomed_y_ = false;
66c380c4 1103 this.drawGraph_();
8b83c6cc
RK
1104 if (this.attr_("zoomCallback")) {
1105 var minDate = this.rawData_[0][0];
1106 var maxDate = this.rawData_[this.rawData_.length - 1][0];
d58ae307 1107 this.attr_("zoomCallback")(minDate, maxDate, this.yAxisRanges());
8b83c6cc 1108 }
67e650dc 1109 }
6a1aa64f
DV
1110};
1111
1112/**
1113 * When the mouse moves in the canvas, display information about a nearby data
1114 * point and draw dots over those points in the data series. This function
1115 * takes care of cleanup of previously-drawn dots.
1116 * @param {Object} event The mousemove event from the browser.
1117 * @private
1118 */
285a6bda 1119Dygraph.prototype.mouseMove_ = function(event) {
e863a17d 1120 // This prevents JS errors when mousing over the canvas before data loads.
4cac8c7a 1121 var points = this.layout_.points;
685ebbb3 1122 if (points === undefined) return;
e863a17d 1123
4cac8c7a
RK
1124 var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(this.mouseEventElement_);
1125
6a1aa64f
DV
1126 var lastx = -1;
1127 var lasty = -1;
1128
1129 // Loop through all the points and find the date nearest to our current
1130 // location.
1131 var minDist = 1e+100;
1132 var idx = -1;
1133 for (var i = 0; i < points.length; i++) {
8a7cc60e
RK
1134 var point = points[i];
1135 if (point == null) continue;
062ef401 1136 var dist = Math.abs(point.canvasx - canvasx);
f032c51d 1137 if (dist > minDist) continue;
6a1aa64f
DV
1138 minDist = dist;
1139 idx = i;
1140 }
1141 if (idx >= 0) lastx = points[idx].xval;
6a1aa64f
DV
1142
1143 // Extract the points we've selected
b258a3da 1144 this.selPoints_ = [];
50360fd0 1145 var l = points.length;
416b05ad
NK
1146 if (!this.attr_("stackedGraph")) {
1147 for (var i = 0; i < l; i++) {
1148 if (points[i].xval == lastx) {
1149 this.selPoints_.push(points[i]);
1150 }
1151 }
1152 } else {
354e15ab
DE
1153 // Need to 'unstack' points starting from the bottom
1154 var cumulative_sum = 0;
416b05ad
NK
1155 for (var i = l - 1; i >= 0; i--) {
1156 if (points[i].xval == lastx) {
354e15ab 1157 var p = {}; // Clone the point since we modify it
d4139cd8
NK
1158 for (var k in points[i]) {
1159 p[k] = points[i][k];
50360fd0
NK
1160 }
1161 p.yval -= cumulative_sum;
1162 cumulative_sum += p.yval;
d4139cd8 1163 this.selPoints_.push(p);
12e4c741 1164 }
6a1aa64f 1165 }
354e15ab 1166 this.selPoints_.reverse();
6a1aa64f
DV
1167 }
1168
b258a3da 1169 if (this.attr_("highlightCallback")) {
a4c6a67c 1170 var px = this.lastx_;
dd082dda 1171 if (px !== null && lastx != px) {
344ba8c0 1172 // only fire if the selected point has changed.
2ddb1197 1173 this.attr_("highlightCallback")(event, lastx, this.selPoints_, this.idxToRow_(idx));
43af96e7 1174 }
12e4c741 1175 }
43af96e7 1176
239c712d
NAG
1177 // Save last x position for callbacks.
1178 this.lastx_ = lastx;
50360fd0 1179
239c712d
NAG
1180 this.updateSelection_();
1181};
b258a3da 1182
239c712d 1183/**
1903f1e4 1184 * Transforms layout_.points index into data row number.
2ddb1197 1185 * @param int layout_.points index
1903f1e4 1186 * @return int row number, or -1 if none could be found.
2ddb1197
SC
1187 * @private
1188 */
1189Dygraph.prototype.idxToRow_ = function(idx) {
1903f1e4 1190 if (idx < 0) return -1;
2ddb1197 1191
1903f1e4
DV
1192 for (var i in this.layout_.datasets) {
1193 if (idx < this.layout_.datasets[i].length) {
1194 return this.boundaryIds_[0][0]+idx;
1195 }
1196 idx -= this.layout_.datasets[i].length;
1197 }
1198 return -1;
1199};
2ddb1197 1200
629a09ae
DV
1201/**
1202 * @private
629a09ae
DV
1203 * Generates HTML for the legend which is displayed when hovering over the
1204 * chart. If no selected points are specified, a default legend is returned
1205 * (this may just be the empty string).
1206 * @param { Number } [x] The x-value of the selected points.
1207 * @param { [Object] } [sel_points] List of selected points for the given
1208 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1209 */
e9fe4a2f 1210Dygraph.prototype.generateLegendHTML_ = function(x, sel_points) {
2fccd3dc
DV
1211 // If no points are selected, we display a default legend. Traditionally,
1212 // this has been blank. But a better default would be a conventional legend,
1213 // which provides essential information for a non-interactive chart.
1214 if (typeof(x) === 'undefined') {
1215 if (this.attr_('legend') != 'always') return '';
1216
1217 var sepLines = this.attr_('labelsSeparateLines');
1218 var labels = this.attr_('labels');
1219 var html = '';
1220 for (var i = 1; i < labels.length; i++) {
352c8310 1221 if (!this.visibility()[i - 1]) continue;
bafe040e 1222 var c = this.plotter_.colors[labels[i]];
352c8310 1223 if (html != '') html += (sepLines ? '<br/>' : ' ');
bafe040e
DV
1224 html += "<b><span style='color: " + c + ";'>&mdash;" + labels[i] +
1225 "</span></b>";
2fccd3dc
DV
1226 }
1227 return html;
1228 }
1229
032e4c1d 1230 var html = this.attr_('xValueFormatter')(x) + ":";
e9fe4a2f
DV
1231
1232 var fmtFunc = this.attr_('yValueFormatter');
1233 var showZeros = this.attr_("labelsShowZeroValues");
1234 var sepLines = this.attr_("labelsSeparateLines");
1235 for (var i = 0; i < this.selPoints_.length; i++) {
1236 var pt = this.selPoints_[i];
1237 if (pt.yval == 0 && !showZeros) continue;
1238 if (!Dygraph.isOK(pt.canvasy)) continue;
1239 if (sepLines) html += "<br/>";
1240
bafe040e 1241 var c = this.plotter_.colors[pt.name];
91c10d9c 1242 var yval = fmtFunc(pt.yval, this);
2fccd3dc 1243 // TODO(danvk): use a template string here and make it an attribute.
bafe040e
DV
1244 html += " <b><span style='color: " + c + ";'>"
1245 + pt.name + "</span></b>:"
e9fe4a2f
DV
1246 + yval;
1247 }
1248 return html;
1249};
1250
629a09ae
DV
1251/**
1252 * @private
1253 * Displays information about the selected points in the legend. If there is no
1254 * selection, the legend will be cleared.
1255 * @param { Number } [x] The x-value of the selected points.
1256 * @param { [Object] } [sel_points] List of selected points for the given
1257 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1258 */
91c10d9c
DV
1259Dygraph.prototype.setLegendHTML_ = function(x, sel_points) {
1260 var html = this.generateLegendHTML_(x, sel_points);
1261 var labelsDiv = this.attr_("labelsDiv");
1262 if (labelsDiv !== null) {
1263 labelsDiv.innerHTML = html;
1264 } else {
1265 if (typeof(this.shown_legend_error_) == 'undefined') {
1266 this.error('labelsDiv is set to something nonexistent; legend will not be shown.');
1267 this.shown_legend_error_ = true;
1268 }
1269 }
1270};
1271
2ddb1197 1272/**
239c712d
NAG
1273 * Draw dots over the selectied points in the data series. This function
1274 * takes care of cleanup of previously-drawn dots.
1275 * @private
1276 */
1277Dygraph.prototype.updateSelection_ = function() {
6a1aa64f 1278 // Clear the previously drawn vertical, if there is one
2cf95fff 1279 var ctx = this.canvas_ctx_;
6a1aa64f 1280 if (this.previousVerticalX_ >= 0) {
46dde5f9
DV
1281 // Determine the maximum highlight circle size.
1282 var maxCircleSize = 0;
227b93cc
DV
1283 var labels = this.attr_('labels');
1284 for (var i = 1; i < labels.length; i++) {
1285 var r = this.attr_('highlightCircleSize', labels[i]);
46dde5f9
DV
1286 if (r > maxCircleSize) maxCircleSize = r;
1287 }
6a1aa64f 1288 var px = this.previousVerticalX_;
46dde5f9
DV
1289 ctx.clearRect(px - maxCircleSize - 1, 0,
1290 2 * maxCircleSize + 2, this.height_);
6a1aa64f
DV
1291 }
1292
d160cc3b 1293 if (this.selPoints_.length > 0) {
6a1aa64f 1294 // Set the status message to indicate the selected point(s)
d160cc3b 1295 if (this.attr_('showLabelsOnHighlight')) {
91c10d9c 1296 this.setLegendHTML_(this.lastx_, this.selPoints_);
6a1aa64f 1297 }
6a1aa64f 1298
6a1aa64f 1299 // Draw colored circles over the center of each selected point
e9fe4a2f 1300 var canvasx = this.selPoints_[0].canvasx;
43af96e7 1301 ctx.save();
b258a3da 1302 for (var i = 0; i < this.selPoints_.length; i++) {
e9fe4a2f
DV
1303 var pt = this.selPoints_[i];
1304 if (!Dygraph.isOK(pt.canvasy)) continue;
1305
1306 var circleSize = this.attr_('highlightCircleSize', pt.name);
6a1aa64f 1307 ctx.beginPath();
e9fe4a2f
DV
1308 ctx.fillStyle = this.plotter_.colors[pt.name];
1309 ctx.arc(canvasx, pt.canvasy, circleSize, 0, 2 * Math.PI, false);
6a1aa64f
DV
1310 ctx.fill();
1311 }
1312 ctx.restore();
1313
1314 this.previousVerticalX_ = canvasx;
1315 }
1316};
1317
1318/**
629a09ae
DV
1319 * Manually set the selected points and display information about them in the
1320 * legend. The selection can be cleared using clearSelection() and queried
1321 * using getSelection().
1322 * @param { Integer } row number that should be highlighted (i.e. appear with
1323 * hover dots on the chart). Set to false to clear any selection.
239c712d
NAG
1324 */
1325Dygraph.prototype.setSelection = function(row) {
1326 // Extract the points we've selected
1327 this.selPoints_ = [];
1328 var pos = 0;
50360fd0 1329
239c712d 1330 if (row !== false) {
16269f6e
NAG
1331 row = row-this.boundaryIds_[0][0];
1332 }
50360fd0 1333
16269f6e 1334 if (row !== false && row >= 0) {
239c712d 1335 for (var i in this.layout_.datasets) {
16269f6e 1336 if (row < this.layout_.datasets[i].length) {
38f33a44 1337 var point = this.layout_.points[pos+row];
1338
1339 if (this.attr_("stackedGraph")) {
8c03ba63 1340 point = this.layout_.unstackPointAtIndex(pos+row);
38f33a44 1341 }
1342
1343 this.selPoints_.push(point);
16269f6e 1344 }
239c712d
NAG
1345 pos += this.layout_.datasets[i].length;
1346 }
16269f6e 1347 }
50360fd0 1348
16269f6e 1349 if (this.selPoints_.length) {
239c712d
NAG
1350 this.lastx_ = this.selPoints_[0].xval;
1351 this.updateSelection_();
1352 } else {
239c712d
NAG
1353 this.clearSelection();
1354 }
1355
1356};
1357
1358/**
6a1aa64f
DV
1359 * The mouse has left the canvas. Clear out whatever artifacts remain
1360 * @param {Object} event the mouseout event from the browser.
1361 * @private
1362 */
285a6bda 1363Dygraph.prototype.mouseOut_ = function(event) {
a4c6a67c
AV
1364 if (this.attr_("unhighlightCallback")) {
1365 this.attr_("unhighlightCallback")(event);
1366 }
1367
43af96e7 1368 if (this.attr_("hideOverlayOnMouseOut")) {
239c712d 1369 this.clearSelection();
43af96e7 1370 }
6a1aa64f
DV
1371};
1372
239c712d 1373/**
629a09ae
DV
1374 * Clears the current selection (i.e. points that were highlighted by moving
1375 * the mouse over the chart).
239c712d
NAG
1376 */
1377Dygraph.prototype.clearSelection = function() {
1378 // Get rid of the overlay data
2cf95fff 1379 this.canvas_ctx_.clearRect(0, 0, this.width_, this.height_);
91c10d9c 1380 this.setLegendHTML_();
239c712d
NAG
1381 this.selPoints_ = [];
1382 this.lastx_ = -1;
1383}
1384
103b7292 1385/**
629a09ae
DV
1386 * Returns the number of the currently selected row. To get data for this row,
1387 * you can use the getValue method.
1388 * @return { Integer } row number, or -1 if nothing is selected
103b7292
NAG
1389 */
1390Dygraph.prototype.getSelection = function() {
1391 if (!this.selPoints_ || this.selPoints_.length < 1) {
1392 return -1;
1393 }
50360fd0 1394
103b7292
NAG
1395 for (var row=0; row<this.layout_.points.length; row++ ) {
1396 if (this.layout_.points[row].x == this.selPoints_[0].x) {
16269f6e 1397 return row + this.boundaryIds_[0][0];
103b7292
NAG
1398 }
1399 }
1400 return -1;
2e1fcf1a 1401};
103b7292 1402
19589a3e 1403/**
629a09ae 1404 * @private
2e1fcf1a
DV
1405 * Return a string version of a number. This respects the digitsAfterDecimal
1406 * and maxNumberWidth options.
1407 * @param {Number} x The number to be formatted
1408 * @param {Dygraph} g The dygraph object
1409 */
1410Dygraph.numberFormatter = function(x, g) {
19589a3e
DV
1411 var sigFigs = g.attr_('sigFigs');
1412
1413 if (sigFigs !== null) {
1414 // User has opted for a fixed number of significant figures.
1415 return Dygraph.floatFormat(x, sigFigs);
1416 }
1417
2e1fcf1a
DV
1418 var digits = g.attr_('digitsAfterDecimal');
1419 var maxNumberWidth = g.attr_('maxNumberWidth');
1420
19589a3e
DV
1421 // switch to scientific notation if we underflow or overflow fixed display.
1422 if (x !== 0.0 &&
1423 (Math.abs(x) >= Math.pow(10, maxNumberWidth) ||
1424 Math.abs(x) < Math.pow(10, -digits))) {
1425 return x.toExponential(digits);
2e1fcf1a
DV
1426 } else {
1427 return '' + Dygraph.round_(x, digits);
1428 }
1429};
32988383 1430
629a09ae 1431/**
bf640e56
AV
1432 * Convert a JS date to a string appropriate to display on an axis that
1433 * is displaying values at the stated granularity.
1434 * @param {Date} date The date to format
1435 * @param {Number} granularity One of the Dygraph granularity constants
1436 * @return {String} The formatted date
1437 * @private
1438 */
1439Dygraph.dateAxisFormatter = function(date, granularity) {
062ef401
JB
1440 if (granularity >= Dygraph.DECADAL) {
1441 return date.strftime('%Y');
1442 } else if (granularity >= Dygraph.MONTHLY) {
bf640e56
AV
1443 return date.strftime('%b %y');
1444 } else {
31eddad3 1445 var frac = date.getHours() * 3600 + date.getMinutes() * 60 + date.getSeconds() + date.getMilliseconds();
bf640e56
AV
1446 if (frac == 0 || granularity >= Dygraph.DAILY) {
1447 return new Date(date.getTime() + 3600*1000).strftime('%d%b');
1448 } else {
1449 return Dygraph.hmsString_(date.getTime());
1450 }
1451 }
2e1fcf1a 1452};
bf640e56
AV
1453
1454/**
6a1aa64f
DV
1455 * Fires when there's data available to be graphed.
1456 * @param {String} data Raw CSV data to be plotted
1457 * @private
1458 */
285a6bda 1459Dygraph.prototype.loadedEvent_ = function(data) {
6a1aa64f 1460 this.rawData_ = this.parseCSV_(data);
26ca7938 1461 this.predraw_();
6a1aa64f
DV
1462};
1463
285a6bda 1464Dygraph.prototype.months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
8846615a 1465 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
285a6bda 1466Dygraph.prototype.quarters = ["Jan", "Apr", "Jul", "Oct"];
6a1aa64f
DV
1467
1468/**
1469 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1470 * @private
1471 */
285a6bda 1472Dygraph.prototype.addXTicks_ = function() {
6a1aa64f 1473 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
7201b11e 1474 var range;
6a1aa64f 1475 if (this.dateWindow_) {
7201b11e 1476 range = [this.dateWindow_[0], this.dateWindow_[1]];
6a1aa64f 1477 } else {
7201b11e
JB
1478 range = [this.rawData_[0][0], this.rawData_[this.rawData_.length - 1][0]];
1479 }
1480
032e4c1d 1481 var xTicks = this.attr_('xTicker')(range[0], range[1], this);
b2c9222a 1482 this.layout_.setXTicks(xTicks);
32988383
DV
1483};
1484
1485// Time granularity enumeration
285a6bda 1486Dygraph.SECONDLY = 0;
20a41c17
DV
1487Dygraph.TWO_SECONDLY = 1;
1488Dygraph.FIVE_SECONDLY = 2;
1489Dygraph.TEN_SECONDLY = 3;
1490Dygraph.THIRTY_SECONDLY = 4;
1491Dygraph.MINUTELY = 5;
1492Dygraph.TWO_MINUTELY = 6;
1493Dygraph.FIVE_MINUTELY = 7;
1494Dygraph.TEN_MINUTELY = 8;
1495Dygraph.THIRTY_MINUTELY = 9;
1496Dygraph.HOURLY = 10;
1497Dygraph.TWO_HOURLY = 11;
1498Dygraph.SIX_HOURLY = 12;
1499Dygraph.DAILY = 13;
1500Dygraph.WEEKLY = 14;
1501Dygraph.MONTHLY = 15;
1502Dygraph.QUARTERLY = 16;
1503Dygraph.BIANNUAL = 17;
1504Dygraph.ANNUAL = 18;
1505Dygraph.DECADAL = 19;
062ef401
JB
1506Dygraph.CENTENNIAL = 20;
1507Dygraph.NUM_GRANULARITIES = 21;
285a6bda
DV
1508
1509Dygraph.SHORT_SPACINGS = [];
1510Dygraph.SHORT_SPACINGS[Dygraph.SECONDLY] = 1000 * 1;
20a41c17
DV
1511Dygraph.SHORT_SPACINGS[Dygraph.TWO_SECONDLY] = 1000 * 2;
1512Dygraph.SHORT_SPACINGS[Dygraph.FIVE_SECONDLY] = 1000 * 5;
285a6bda
DV
1513Dygraph.SHORT_SPACINGS[Dygraph.TEN_SECONDLY] = 1000 * 10;
1514Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_SECONDLY] = 1000 * 30;
1515Dygraph.SHORT_SPACINGS[Dygraph.MINUTELY] = 1000 * 60;
20a41c17
DV
1516Dygraph.SHORT_SPACINGS[Dygraph.TWO_MINUTELY] = 1000 * 60 * 2;
1517Dygraph.SHORT_SPACINGS[Dygraph.FIVE_MINUTELY] = 1000 * 60 * 5;
285a6bda
DV
1518Dygraph.SHORT_SPACINGS[Dygraph.TEN_MINUTELY] = 1000 * 60 * 10;
1519Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_MINUTELY] = 1000 * 60 * 30;
1520Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600;
20a41c17 1521Dygraph.SHORT_SPACINGS[Dygraph.TWO_HOURLY] = 1000 * 3600 * 2;
805d5519 1522Dygraph.SHORT_SPACINGS[Dygraph.SIX_HOURLY] = 1000 * 3600 * 6;
285a6bda
DV
1523Dygraph.SHORT_SPACINGS[Dygraph.DAILY] = 1000 * 86400;
1524Dygraph.SHORT_SPACINGS[Dygraph.WEEKLY] = 1000 * 604800;
32988383 1525
629a09ae
DV
1526/**
1527 * @private
1528 * If we used this time granularity, how many ticks would there be?
1529 * This is only an approximation, but it's generally good enough.
1530 */
285a6bda
DV
1531Dygraph.prototype.NumXTicks = function(start_time, end_time, granularity) {
1532 if (granularity < Dygraph.MONTHLY) {
32988383 1533 // Generate one tick mark for every fixed interval of time.
285a6bda 1534 var spacing = Dygraph.SHORT_SPACINGS[granularity];
32988383
DV
1535 return Math.floor(0.5 + 1.0 * (end_time - start_time) / spacing);
1536 } else {
1537 var year_mod = 1; // e.g. to only print one point every 10 years.
1538 var num_months = 12;
285a6bda
DV
1539 if (granularity == Dygraph.QUARTERLY) num_months = 3;
1540 if (granularity == Dygraph.BIANNUAL) num_months = 2;
1541 if (granularity == Dygraph.ANNUAL) num_months = 1;
1542 if (granularity == Dygraph.DECADAL) { num_months = 1; year_mod = 10; }
062ef401 1543 if (granularity == Dygraph.CENTENNIAL) { num_months = 1; year_mod = 100; }
32988383
DV
1544
1545 var msInYear = 365.2524 * 24 * 3600 * 1000;
1546 var num_years = 1.0 * (end_time - start_time) / msInYear;
1547 return Math.floor(0.5 + 1.0 * num_years * num_months / year_mod);
1548 }
1549};
1550
629a09ae
DV
1551/**
1552 * @private
1553 *
1554 * Construct an x-axis of nicely-formatted times on meaningful boundaries
1555 * (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1556 *
1557 * Returns an array containing {v: millis, label: label} dictionaries.
1558 */
285a6bda 1559Dygraph.prototype.GetXAxis = function(start_time, end_time, granularity) {
bf640e56 1560 var formatter = this.attr_("xAxisLabelFormatter");
32988383 1561 var ticks = [];
285a6bda 1562 if (granularity < Dygraph.MONTHLY) {
32988383 1563 // Generate one tick mark for every fixed interval of time.
285a6bda 1564 var spacing = Dygraph.SHORT_SPACINGS[granularity];
3d29302c 1565 var format = '%d%b'; // e.g. "1Jan"
076c9622
DV
1566
1567 // Find a time less than start_time which occurs on a "nice" time boundary
1568 // for this granularity.
1569 var g = spacing / 1000;
076c9622
DV
1570 var d = new Date(start_time);
1571 if (g <= 60) { // seconds
1572 var x = d.getSeconds(); d.setSeconds(x - x % g);
1573 } else {
1574 d.setSeconds(0);
1575 g /= 60;
1576 if (g <= 60) { // minutes
1577 var x = d.getMinutes(); d.setMinutes(x - x % g);
1578 } else {
1579 d.setMinutes(0);
1580 g /= 60;
1581
1582 if (g <= 24) { // days
1583 var x = d.getHours(); d.setHours(x - x % g);
1584 } else {
1585 d.setHours(0);
1586 g /= 24;
1587
1588 if (g == 7) { // one week
20a41c17 1589 d.setDate(d.getDate() - d.getDay());
076c9622
DV
1590 }
1591 }
1592 }
328bb812 1593 }
076c9622
DV
1594 start_time = d.getTime();
1595
32988383 1596 for (var t = start_time; t <= end_time; t += spacing) {
bf640e56 1597 ticks.push({ v:t, label: formatter(new Date(t), granularity) });
32988383
DV
1598 }
1599 } else {
1600 // Display a tick mark on the first of a set of months of each year.
1601 // Years get a tick mark iff y % year_mod == 0. This is useful for
1602 // displaying a tick mark once every 10 years, say, on long time scales.
1603 var months;
1604 var year_mod = 1; // e.g. to only print one point every 10 years.
1605
285a6bda 1606 if (granularity == Dygraph.MONTHLY) {
32988383 1607 months = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
285a6bda 1608 } else if (granularity == Dygraph.QUARTERLY) {
32988383 1609 months = [ 0, 3, 6, 9 ];
285a6bda 1610 } else if (granularity == Dygraph.BIANNUAL) {
32988383 1611 months = [ 0, 6 ];
285a6bda 1612 } else if (granularity == Dygraph.ANNUAL) {
32988383 1613 months = [ 0 ];
285a6bda 1614 } else if (granularity == Dygraph.DECADAL) {
32988383
DV
1615 months = [ 0 ];
1616 year_mod = 10;
062ef401
JB
1617 } else if (granularity == Dygraph.CENTENNIAL) {
1618 months = [ 0 ];
1619 year_mod = 100;
1620 } else {
1621 this.warn("Span of dates is too long");
32988383
DV
1622 }
1623
1624 var start_year = new Date(start_time).getFullYear();
1625 var end_year = new Date(end_time).getFullYear();
285a6bda 1626 var zeropad = Dygraph.zeropad;
32988383
DV
1627 for (var i = start_year; i <= end_year; i++) {
1628 if (i % year_mod != 0) continue;
1629 for (var j = 0; j < months.length; j++) {
1630 var date_str = i + "/" + zeropad(1 + months[j]) + "/01";
d96b7d1a 1631 var t = Dygraph.dateStrToMillis(date_str);
32988383 1632 if (t < start_time || t > end_time) continue;
bf640e56 1633 ticks.push({ v:t, label: formatter(new Date(t), granularity) });
32988383
DV
1634 }
1635 }
1636 }
1637
1638 return ticks;
1639};
1640
6a1aa64f
DV
1641
1642/**
1643 * Add ticks to the x-axis based on a date range.
1644 * @param {Number} startDate Start of the date window (millis since epoch)
1645 * @param {Number} endDate End of the date window (millis since epoch)
629a09ae
DV
1646 * @param {Dygraph} self The dygraph object
1647 * @return { [Object] } Array of {label, value} tuples.
6a1aa64f
DV
1648 * @public
1649 */
285a6bda 1650Dygraph.dateTicker = function(startDate, endDate, self) {
629a09ae 1651 // TODO(danvk): why does this take 'self' as a param?
32988383 1652 var chosen = -1;
285a6bda
DV
1653 for (var i = 0; i < Dygraph.NUM_GRANULARITIES; i++) {
1654 var num_ticks = self.NumXTicks(startDate, endDate, i);
1655 if (self.width_ / num_ticks >= self.attr_('pixelsPerXLabel')) {
32988383
DV
1656 chosen = i;
1657 break;
2769de62 1658 }
6a1aa64f
DV
1659 }
1660
32988383 1661 if (chosen >= 0) {
285a6bda 1662 return self.GetXAxis(startDate, endDate, chosen);
6a1aa64f 1663 } else {
32988383 1664 // TODO(danvk): signal error.
6a1aa64f 1665 }
6a1aa64f
DV
1666};
1667
629a09ae
DV
1668/**
1669 * @private
1670 * This is a list of human-friendly values at which to show tick marks on a log
1671 * scale. It is k * 10^n, where k=1..9 and n=-39..+39, so:
1672 * ..., 1, 2, 3, 4, 5, ..., 9, 10, 20, 30, ..., 90, 100, 200, 300, ...
1673 * NOTE: this assumes that Dygraph.LOG_SCALE = 10.
1674 */
0cfa06d1 1675Dygraph.PREFERRED_LOG_TICK_VALUES = function() {
6821efbe
RK
1676 var vals = [];
1677 for (var power = -39; power <= 39; power++) {
1678 var range = Math.pow(10, power);
4b467120
RK
1679 for (var mult = 1; mult <= 9; mult++) {
1680 var val = range * mult;
6821efbe
RK
1681 vals.push(val);
1682 }
1683 }
1684 return vals;
1685}();
1686
629a09ae 1687// TODO(konigsberg): Update comment.
6a1aa64f
DV
1688/**
1689 * Add ticks when the x axis has numbers on it (instead of dates)
ff022deb 1690 *
7d0e7a0d
RK
1691 * @param {Number} minV minimum value
1692 * @param {Number} maxV maximum value
84fc6aa7 1693 * @param self
f30cf740 1694 * @param {function} attribute accessor function.
629a09ae 1695 * @return {[Object]} Array of {label, value} tuples.
6a1aa64f 1696 */
0d64e596 1697Dygraph.numericTicks = function(minV, maxV, self, axis_props, vals) {
70c80071
DV
1698 var attr = function(k) {
1699 if (axis_props && axis_props.hasOwnProperty(k)) return axis_props[k];
1700 return self.attr_(k);
1701 };
f09fc545 1702
0d64e596
DV
1703 var ticks = [];
1704 if (vals) {
1705 for (var i = 0; i < vals.length; i++) {
e863a17d 1706 ticks.push({v: vals[i]});
0d64e596 1707 }
f09e46d4 1708 } else {
7d0e7a0d 1709 if (axis_props && attr("logscale")) {
ff022deb 1710 var pixelsPerTick = attr('pixelsPerYLabel');
7d0e7a0d 1711 // NOTE(konigsberg): Dan, should self.height_ be self.plotter_.area.h?
ff022deb 1712 var nTicks = Math.floor(self.height_ / pixelsPerTick);
0cfa06d1
RK
1713 var minIdx = Dygraph.binarySearch(minV, Dygraph.PREFERRED_LOG_TICK_VALUES, 1);
1714 var maxIdx = Dygraph.binarySearch(maxV, Dygraph.PREFERRED_LOG_TICK_VALUES, -1);
1715 if (minIdx == -1) {
6821efbe
RK
1716 minIdx = 0;
1717 }
0cfa06d1
RK
1718 if (maxIdx == -1) {
1719 maxIdx = Dygraph.PREFERRED_LOG_TICK_VALUES.length - 1;
6821efbe 1720 }
0cfa06d1
RK
1721 // Count the number of tick values would appear, if we can get at least
1722 // nTicks / 4 accept them.
00aa7f61 1723 var lastDisplayed = null;
0cfa06d1 1724 if (maxIdx - minIdx >= nTicks / 4) {
00aa7f61 1725 var axisId = axis_props.yAxisId;
0cfa06d1
RK
1726 for (var idx = maxIdx; idx >= minIdx; idx--) {
1727 var tickValue = Dygraph.PREFERRED_LOG_TICK_VALUES[idx];
00aa7f61
RK
1728 var domCoord = axis_props.g.toDomYCoord(tickValue, axisId);
1729 var tick = { v: tickValue };
1730 if (lastDisplayed == null) {
1731 lastDisplayed = {
1732 tickValue : tickValue,
1733 domCoord : domCoord
1734 };
1735 } else {
1736 if (domCoord - lastDisplayed.domCoord >= pixelsPerTick) {
1737 lastDisplayed = {
1738 tickValue : tickValue,
1739 domCoord : domCoord
1740 };
1741 } else {
c1bc242a 1742 tick.label = "";
00aa7f61
RK
1743 }
1744 }
1745 ticks.push(tick);
6821efbe 1746 }
0cfa06d1
RK
1747 // Since we went in backwards order.
1748 ticks.reverse();
6821efbe 1749 }
f09e46d4 1750 }
c1bc242a 1751
6821efbe
RK
1752 // ticks.length won't be 0 if the log scale function finds values to insert.
1753 if (ticks.length == 0) {
ff022deb
RK
1754 // Basic idea:
1755 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1756 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks).
1757 // The first spacing greater than pixelsPerYLabel is what we use.
1758 // TODO(danvk): version that works on a log scale.
0d64e596 1759 if (attr("labelsKMG2")) {
ff022deb 1760 var mults = [1, 2, 4, 8];
0d64e596 1761 } else {
ff022deb 1762 var mults = [1, 2, 5];
0d64e596 1763 }
ff022deb
RK
1764 var scale, low_val, high_val, nTicks;
1765 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1766 var pixelsPerTick = attr('pixelsPerYLabel');
1767 for (var i = -10; i < 50; i++) {
1768 if (attr("labelsKMG2")) {
1769 var base_scale = Math.pow(16, i);
1770 } else {
1771 var base_scale = Math.pow(10, i);
1772 }
1773 for (var j = 0; j < mults.length; j++) {
1774 scale = base_scale * mults[j];
1775 low_val = Math.floor(minV / scale) * scale;
1776 high_val = Math.ceil(maxV / scale) * scale;
1777 nTicks = Math.abs(high_val - low_val) / scale;
1778 var spacing = self.height_ / nTicks;
1779 // wish I could break out of both loops at once...
1780 if (spacing > pixelsPerTick) break;
1781 }
0d64e596
DV
1782 if (spacing > pixelsPerTick) break;
1783 }
0d64e596 1784
ff022deb
RK
1785 // Construct the set of ticks.
1786 // Allow reverse y-axis if it's explicitly requested.
1787 if (low_val > high_val) scale *= -1;
1788 for (var i = 0; i < nTicks; i++) {
1789 var tickV = low_val + i * scale;
1790 ticks.push( {v: tickV} );
1791 }
0d64e596 1792 }
6a1aa64f
DV
1793 }
1794
0d64e596 1795 // Add formatted labels to the ticks.
ed11be50
DV
1796 var k;
1797 var k_labels = [];
f09fc545 1798 if (attr("labelsKMB")) {
ed11be50
DV
1799 k = 1000;
1800 k_labels = [ "K", "M", "B", "T" ];
1801 }
f09fc545 1802 if (attr("labelsKMG2")) {
ed11be50
DV
1803 if (k) self.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1804 k = 1024;
1805 k_labels = [ "k", "M", "G", "T" ];
1806 }
3c1d225b
JB
1807 var formatter = attr('yAxisLabelFormatter') ?
1808 attr('yAxisLabelFormatter') : attr('yValueFormatter');
1809
0cfa06d1 1810 // Add labels to the ticks.
0d64e596 1811 for (var i = 0; i < ticks.length; i++) {
e863a17d 1812 if (ticks[i].label !== undefined) continue; // Use current label.
0d64e596 1813 var tickV = ticks[i].v;
0af6e346 1814 var absTickV = Math.abs(tickV);
2e1fcf1a 1815 var label = formatter(tickV, self);
3c1d225b 1816 if (k_labels.length > 0) {
ed11be50
DV
1817 // Round up to an appropriate unit.
1818 var n = k*k*k*k;
1819 for (var j = 3; j >= 0; j--, n /= k) {
1820 if (absTickV >= n) {
17d0210c 1821 label = Dygraph.round_(tickV / n, attr('digitsAfterDecimal')) + k_labels[j];
ed11be50
DV
1822 break;
1823 }
afefbcdb 1824 }
6a1aa64f 1825 }
d916677a 1826 ticks[i].label = label;
6a1aa64f 1827 }
d916677a 1828
032e4c1d 1829 return ticks;
6a1aa64f
DV
1830};
1831
629a09ae
DV
1832/**
1833 * @private
1834 * Computes the range of the data series (including confidence intervals).
1835 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
1836 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1837 * @return [low, high]
1838 */
5011e7a1
DV
1839Dygraph.prototype.extremeValues_ = function(series) {
1840 var minY = null, maxY = null;
1841
9922b78b 1842 var bars = this.attr_("errorBars") || this.attr_("customBars");
5011e7a1
DV
1843 if (bars) {
1844 // With custom bars, maxY is the max of the high values.
1845 for (var j = 0; j < series.length; j++) {
1846 var y = series[j][1][0];
1847 if (!y) continue;
1848 var low = y - series[j][1][1];
1849 var high = y + series[j][1][2];
1850 if (low > y) low = y; // this can happen with custom bars,
1851 if (high < y) high = y; // e.g. in tests/custom-bars.html
1852 if (maxY == null || high > maxY) {
1853 maxY = high;
1854 }
1855 if (minY == null || low < minY) {
1856 minY = low;
1857 }
1858 }
1859 } else {
1860 for (var j = 0; j < series.length; j++) {
1861 var y = series[j][1];
d12999d3 1862 if (y === null || isNaN(y)) continue;
5011e7a1
DV
1863 if (maxY == null || y > maxY) {
1864 maxY = y;
1865 }
1866 if (minY == null || y < minY) {
1867 minY = y;
1868 }
1869 }
1870 }
1871
1872 return [minY, maxY];
1873};
1874
6a1aa64f 1875/**
629a09ae 1876 * @private
26ca7938
DV
1877 * This function is called once when the chart's data is changed or the options
1878 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1879 * idea is that values derived from the chart's data can be computed here,
1880 * rather than every time the chart is drawn. This includes things like the
1881 * number of axes, rolling averages, etc.
1882 */
1883Dygraph.prototype.predraw_ = function() {
1884 // TODO(danvk): move more computations out of drawGraph_ and into here.
1885 this.computeYAxes_();
1886
1887 // Create a new plotter.
70c80071 1888 if (this.plotter_) this.plotter_.clear();
26ca7938 1889 this.plotter_ = new DygraphCanvasRenderer(this,
2cf95fff
RK
1890 this.hidden_,
1891 this.hidden_ctx_,
0e23cfc6 1892 this.layout_);
26ca7938 1893
0abfbd7e
DV
1894 // The roller sits in the bottom left corner of the chart. We don't know where
1895 // this will be until the options are available, so it's positioned here.
8c69de65 1896 this.createRollInterface_();
26ca7938 1897
0abfbd7e
DV
1898 // Same thing applies for the labelsDiv. It's right edge should be flush with
1899 // the right edge of the charting area (which may not be the same as the right
1900 // edge of the div, if we have two y-axes.
1901 this.positionLabelsDiv_();
1902
26ca7938
DV
1903 // If the data or options have changed, then we'd better redraw.
1904 this.drawGraph_();
1905};
1906
1907/**
1908 * Update the graph with new data. This method is called when the viewing area
1909 * has changed. If the underlying data or options have changed, predraw_ will
1910 * be called before drawGraph_ is called.
fc4e84fa
RK
1911 *
1912 * clearSelection, when undefined or true, causes this.clearSelection to be
1913 * called at the end of the draw operation. This should rarely be defined,
1914 * and never true (that is it should be undefined most of the time, and
1915 * rarely false.)
1916 *
6a1aa64f
DV
1917 * @private
1918 */
fc4e84fa 1919Dygraph.prototype.drawGraph_ = function(clearSelection) {
c682f205 1920 if (typeof(clearSelection) === 'undefined') {
fc4e84fa
RK
1921 clearSelection = true;
1922 }
1923
26ca7938
DV
1924 var data = this.rawData_;
1925
fe0b7c03
DV
1926 // This is used to set the second parameter to drawCallback, below.
1927 var is_initial_draw = this.is_initial_draw_;
1928 this.is_initial_draw_ = false;
1929
3bd9c228 1930 var minY = null, maxY = null;
6a1aa64f 1931 this.layout_.removeAllDatasets();
285a6bda 1932 this.setColors_();
9317362d 1933 this.attrs_['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
285a6bda 1934
354e15ab
DE
1935 // Loop over the fields (series). Go from the last to the first,
1936 // because if they're stacked that's how we accumulate the values.
43af96e7 1937
354e15ab
DE
1938 var cumulative_y = []; // For stacked series.
1939 var datasets = [];
1940
f09fc545
DV
1941 var extremes = {}; // series name -> [low, high]
1942
354e15ab
DE
1943 // Loop over all fields and create datasets
1944 for (var i = data[0].length - 1; i >= 1; i--) {
1cf11047
DV
1945 if (!this.visibility()[i - 1]) continue;
1946
f09fc545 1947 var seriesName = this.attr_("labels")[i];
450fe64b 1948 var connectSeparatedPoints = this.attr_('connectSeparatedPoints', i);
6e6a2b0a 1949 var logScale = this.attr_('logscale', i);
450fe64b 1950
6a1aa64f
DV
1951 var series = [];
1952 for (var j = 0; j < data.length; j++) {
6e6a2b0a
RK
1953 var date = data[j][0];
1954 var point = data[j][i];
1955 if (logScale) {
1956 // On the log scale, points less than zero do not exist.
1957 // This will create a gap in the chart. Note that this ignores
1958 // connectSeparatedPoints.
e863a17d 1959 if (point <= 0) {
6e6a2b0a
RK
1960 point = null;
1961 }
1962 series.push([date, point]);
1963 } else {
1964 if (point != null || !connectSeparatedPoints) {
1965 series.push([date, point]);
1966 }
f032c51d 1967 }
6a1aa64f 1968 }
2f5e7e1a
DV
1969
1970 // TODO(danvk): move this into predraw_. It's insane to do it here.
6a1aa64f
DV
1971 series = this.rollingAverage(series, this.rollPeriod_);
1972
1973 // Prune down to the desired range, if necessary (for zooming)
1a26f3fb
DV
1974 // Because there can be lines going to points outside of the visible area,
1975 // we actually prune to visible points, plus one on either side.
9922b78b 1976 var bars = this.attr_("errorBars") || this.attr_("customBars");
6a1aa64f
DV
1977 if (this.dateWindow_) {
1978 var low = this.dateWindow_[0];
1979 var high= this.dateWindow_[1];
1980 var pruned = [];
1a26f3fb
DV
1981 // TODO(danvk): do binary search instead of linear search.
1982 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1983 var firstIdx = null, lastIdx = null;
6a1aa64f 1984 for (var k = 0; k < series.length; k++) {
1a26f3fb
DV
1985 if (series[k][0] >= low && firstIdx === null) {
1986 firstIdx = k;
1987 }
1988 if (series[k][0] <= high) {
1989 lastIdx = k;
6a1aa64f
DV
1990 }
1991 }
1a26f3fb
DV
1992 if (firstIdx === null) firstIdx = 0;
1993 if (firstIdx > 0) firstIdx--;
1994 if (lastIdx === null) lastIdx = series.length - 1;
1995 if (lastIdx < series.length - 1) lastIdx++;
16269f6e 1996 this.boundaryIds_[i-1] = [firstIdx, lastIdx];
1a26f3fb
DV
1997 for (var k = firstIdx; k <= lastIdx; k++) {
1998 pruned.push(series[k]);
6a1aa64f
DV
1999 }
2000 series = pruned;
16269f6e
NAG
2001 } else {
2002 this.boundaryIds_[i-1] = [0, series.length-1];
6a1aa64f
DV
2003 }
2004
f09fc545 2005 var seriesExtremes = this.extremeValues_(series);
5011e7a1 2006
6a1aa64f 2007 if (bars) {
354e15ab
DE
2008 for (var j=0; j<series.length; j++) {
2009 val = [series[j][0], series[j][1][0], series[j][1][1], series[j][1][2]];
2010 series[j] = val;
2011 }
43af96e7 2012 } else if (this.attr_("stackedGraph")) {
43af96e7
NK
2013 var l = series.length;
2014 var actual_y;
2015 for (var j = 0; j < l; j++) {
354e15ab
DE
2016 // If one data set has a NaN, let all subsequent stacked
2017 // sets inherit the NaN -- only start at 0 for the first set.
2018 var x = series[j][0];
41b0f691 2019 if (cumulative_y[x] === undefined) {
354e15ab 2020 cumulative_y[x] = 0;
41b0f691 2021 }
43af96e7
NK
2022
2023 actual_y = series[j][1];
354e15ab 2024 cumulative_y[x] += actual_y;
43af96e7 2025
354e15ab 2026 series[j] = [x, cumulative_y[x]]
43af96e7 2027
41b0f691
DV
2028 if (cumulative_y[x] > seriesExtremes[1]) {
2029 seriesExtremes[1] = cumulative_y[x];
2030 }
2031 if (cumulative_y[x] < seriesExtremes[0]) {
2032 seriesExtremes[0] = cumulative_y[x];
2033 }
43af96e7 2034 }
6a1aa64f 2035 }
41b0f691 2036 extremes[seriesName] = seriesExtremes;
354e15ab
DE
2037
2038 datasets[i] = series;
6a1aa64f
DV
2039 }
2040
354e15ab 2041 for (var i = 1; i < datasets.length; i++) {
4523c1f6 2042 if (!this.visibility()[i - 1]) continue;
354e15ab 2043 this.layout_.addDataset(this.attr_("labels")[i], datasets[i]);
43af96e7
NK
2044 }
2045
6faebb69 2046 this.computeYAxisRanges_(extremes);
b2c9222a
DV
2047 this.layout_.setYAxes(this.axes_);
2048
6a1aa64f
DV
2049 this.addXTicks_();
2050
b2c9222a 2051 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
81856f70 2052 var tmp_zoomed_x = this.zoomed_x_;
6a1aa64f 2053 // Tell PlotKit to use this new data and render itself
b2c9222a 2054 this.layout_.setDateWindow(this.dateWindow_);
81856f70 2055 this.zoomed_x_ = tmp_zoomed_x;
6a1aa64f
DV
2056 this.layout_.evaluateWithError();
2057 this.plotter_.clear();
2058 this.plotter_.render();
f6401bf6 2059 this.canvas_.getContext('2d').clearRect(0, 0, this.canvas_.width,
2f5e7e1a 2060 this.canvas_.height);
599fb4ad 2061
2fccd3dc
DV
2062 if (is_initial_draw) {
2063 // Generate a static legend before any particular point is selected.
91c10d9c 2064 this.setLegendHTML_();
06303c32 2065 } else {
fc4e84fa
RK
2066 if (clearSelection) {
2067 if (typeof(this.selPoints_) !== 'undefined' && this.selPoints_.length) {
2068 // We should select the point nearest the page x/y here, but it's easier
2069 // to just clear the selection. This prevents erroneous hover dots from
2070 // being displayed.
2071 this.clearSelection();
2072 } else {
2073 this.clearSelection();
2074 }
06303c32 2075 }
2fccd3dc
DV
2076 }
2077
599fb4ad 2078 if (this.attr_("drawCallback") !== null) {
fe0b7c03 2079 this.attr_("drawCallback")(this, is_initial_draw);
599fb4ad 2080 }
6a1aa64f
DV
2081};
2082
2083/**
629a09ae 2084 * @private
26ca7938
DV
2085 * Determine properties of the y-axes which are independent of the data
2086 * currently being displayed. This includes things like the number of axes and
2087 * the style of the axes. It does not include the range of each axis and its
2088 * tick marks.
2089 * This fills in this.axes_ and this.seriesToAxisMap_.
2090 * axes_ = [ { options } ]
2091 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2092 * indices are into the axes_ array.
f09fc545 2093 */
26ca7938 2094Dygraph.prototype.computeYAxes_ = function() {
d64b8fea
RK
2095 // Preserve valueWindow settings if they exist, and if the user hasn't
2096 // specified a new valueRange.
2097 var valueWindows;
2098 if (this.axes_ != undefined && this.user_attrs_.hasOwnProperty("valueRange") == false) {
2099 valueWindows = [];
2100 for (var index = 0; index < this.axes_.length; index++) {
2101 valueWindows.push(this.axes_[index].valueWindow);
2102 }
2103 }
2104
2105
00aa7f61 2106 this.axes_ = [{ yAxisId : 0, g : this }]; // always have at least one y-axis.
26ca7938
DV
2107 this.seriesToAxisMap_ = {};
2108
2109 // Get a list of series names.
2110 var labels = this.attr_("labels");
1c77a3a1 2111 var series = {};
26ca7938 2112 for (var i = 1; i < labels.length; i++) series[labels[i]] = (i - 1);
f09fc545
DV
2113
2114 // all options which could be applied per-axis:
2115 var axisOptions = [
2116 'includeZero',
2117 'valueRange',
2118 'labelsKMB',
2119 'labelsKMG2',
2120 'pixelsPerYLabel',
2121 'yAxisLabelWidth',
2122 'axisLabelFontSize',
7d0e7a0d
RK
2123 'axisTickSize',
2124 'logscale'
f09fc545
DV
2125 ];
2126
2127 // Copy global axis options over to the first axis.
2128 for (var i = 0; i < axisOptions.length; i++) {
2129 var k = axisOptions[i];
2130 var v = this.attr_(k);
26ca7938 2131 if (v) this.axes_[0][k] = v;
f09fc545
DV
2132 }
2133
2134 // Go through once and add all the axes.
26ca7938
DV
2135 for (var seriesName in series) {
2136 if (!series.hasOwnProperty(seriesName)) continue;
f09fc545
DV
2137 var axis = this.attr_("axis", seriesName);
2138 if (axis == null) {
26ca7938 2139 this.seriesToAxisMap_[seriesName] = 0;
f09fc545
DV
2140 continue;
2141 }
2142 if (typeof(axis) == 'object') {
2143 // Add a new axis, making a copy of its per-axis options.
2144 var opts = {};
26ca7938 2145 Dygraph.update(opts, this.axes_[0]);
f09fc545 2146 Dygraph.update(opts, { valueRange: null }); // shouldn't inherit this.
00aa7f61
RK
2147 var yAxisId = this.axes_.length;
2148 opts.yAxisId = yAxisId;
2149 opts.g = this;
f09fc545 2150 Dygraph.update(opts, axis);
26ca7938 2151 this.axes_.push(opts);
00aa7f61 2152 this.seriesToAxisMap_[seriesName] = yAxisId;
f09fc545
DV
2153 }
2154 }
2155
2156 // Go through one more time and assign series to an axis defined by another
2157 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
26ca7938
DV
2158 for (var seriesName in series) {
2159 if (!series.hasOwnProperty(seriesName)) continue;
f09fc545
DV
2160 var axis = this.attr_("axis", seriesName);
2161 if (typeof(axis) == 'string') {
26ca7938 2162 if (!this.seriesToAxisMap_.hasOwnProperty(axis)) {
f09fc545
DV
2163 this.error("Series " + seriesName + " wants to share a y-axis with " +
2164 "series " + axis + ", which does not define its own axis.");
2165 return null;
2166 }
26ca7938
DV
2167 var idx = this.seriesToAxisMap_[axis];
2168 this.seriesToAxisMap_[seriesName] = idx;
f09fc545
DV
2169 }
2170 }
1c77a3a1
DV
2171
2172 // Now we remove series from seriesToAxisMap_ which are not visible. We do
2173 // this last so that hiding the first series doesn't destroy the axis
2174 // properties of the primary axis.
2175 var seriesToAxisFiltered = {};
2176 var vis = this.visibility();
2177 for (var i = 1; i < labels.length; i++) {
2178 var s = labels[i];
2179 if (vis[i - 1]) seriesToAxisFiltered[s] = this.seriesToAxisMap_[s];
2180 }
2181 this.seriesToAxisMap_ = seriesToAxisFiltered;
d64b8fea
RK
2182
2183 if (valueWindows != undefined) {
2184 // Restore valueWindow settings.
2185 for (var index = 0; index < valueWindows.length; index++) {
2186 this.axes_[index].valueWindow = valueWindows[index];
2187 }
2188 }
26ca7938
DV
2189};
2190
2191/**
2192 * Returns the number of y-axes on the chart.
2193 * @return {Number} the number of axes.
2194 */
2195Dygraph.prototype.numAxes = function() {
2196 var last_axis = 0;
2197 for (var series in this.seriesToAxisMap_) {
2198 if (!this.seriesToAxisMap_.hasOwnProperty(series)) continue;
2199 var idx = this.seriesToAxisMap_[series];
2200 if (idx > last_axis) last_axis = idx;
2201 }
2202 return 1 + last_axis;
2203};
2204
2205/**
629a09ae 2206 * @private
b2c9222a
DV
2207 * Returns axis properties for the given series.
2208 * @param { String } setName The name of the series for which to get axis
2209 * properties, e.g. 'Y1'.
2210 * @return { Object } The axis properties.
2211 */
2212Dygraph.prototype.axisPropertiesForSeries = function(series) {
2213 // TODO(danvk): handle errors.
2214 return this.axes_[this.seriesToAxisMap_[series]];
2215};
2216
2217/**
2218 * @private
26ca7938
DV
2219 * Determine the value range and tick marks for each axis.
2220 * @param {Object} extremes A mapping from seriesName -> [low, high]
2221 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2222 */
2223Dygraph.prototype.computeYAxisRanges_ = function(extremes) {
2224 // Build a map from axis number -> [list of series names]
2225 var seriesForAxis = [];
2226 for (var series in this.seriesToAxisMap_) {
2227 if (!this.seriesToAxisMap_.hasOwnProperty(series)) continue;
2228 var idx = this.seriesToAxisMap_[series];
2229 while (seriesForAxis.length <= idx) seriesForAxis.push([]);
2230 seriesForAxis[idx].push(series);
2231 }
f09fc545
DV
2232
2233 // Compute extreme values, a span and tick marks for each axis.
26ca7938
DV
2234 for (var i = 0; i < this.axes_.length; i++) {
2235 var axis = this.axes_[i];
25f76ae3 2236
06fc69b6
AV
2237 if (!seriesForAxis[i]) {
2238 // If no series are defined or visible then use a reasonable default
2239 axis.extremeRange = [0, 1];
2240 } else {
1c77a3a1 2241 // Calculate the extremes of extremes.
f09fc545
DV
2242 var series = seriesForAxis[i];
2243 var minY = Infinity; // extremes[series[0]][0];
2244 var maxY = -Infinity; // extremes[series[0]][1];
ba049b89 2245 var extremeMinY, extremeMaxY;
f09fc545 2246 for (var j = 0; j < series.length; j++) {
ba049b89
NN
2247 // Only use valid extremes to stop null data series' from corrupting the scale.
2248 extremeMinY = extremes[series[j]][0];
2249 if (extremeMinY != null) {
36dfa958 2250 minY = Math.min(extremeMinY, minY);
ba049b89
NN
2251 }
2252 extremeMaxY = extremes[series[j]][1];
2253 if (extremeMaxY != null) {
36dfa958 2254 maxY = Math.max(extremeMaxY, maxY);
ba049b89 2255 }
f09fc545
DV
2256 }
2257 if (axis.includeZero && minY > 0) minY = 0;
2258
ba049b89 2259 // Ensure we have a valid scale, otherwise defualt to zero for safety.
36dfa958
DV
2260 if (minY == Infinity) minY = 0;
2261 if (maxY == -Infinity) maxY = 0;
ba049b89 2262
f09fc545
DV
2263 // Add some padding and round up to an integer to be human-friendly.
2264 var span = maxY - minY;
2265 // special case: if we have no sense of scale, use +/-10% of the sole value.
2266 if (span == 0) { span = maxY; }
f09fc545 2267
ff022deb
RK
2268 var maxAxisY;
2269 var minAxisY;
7d0e7a0d 2270 if (axis.logscale) {
ff022deb
RK
2271 var maxAxisY = maxY + 0.1 * span;
2272 var minAxisY = minY;
2273 } else {
2274 var maxAxisY = maxY + 0.1 * span;
2275 var minAxisY = minY - 0.1 * span;
f09fc545 2276
ff022deb
RK
2277 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2278 if (!this.attr_("avoidMinZero")) {
2279 if (minAxisY < 0 && minY >= 0) minAxisY = 0;
2280 if (maxAxisY > 0 && maxY <= 0) maxAxisY = 0;
2281 }
f09fc545 2282
ff022deb
RK
2283 if (this.attr_("includeZero")) {
2284 if (maxY < 0) maxAxisY = 0;
2285 if (minY > 0) minAxisY = 0;
2286 }
f09fc545 2287 }
4cac8c7a
RK
2288 axis.extremeRange = [minAxisY, maxAxisY];
2289 }
2290 if (axis.valueWindow) {
2291 // This is only set if the user has zoomed on the y-axis. It is never set
2292 // by a user. It takes precedence over axis.valueRange because, if you set
2293 // valueRange, you'd still expect to be able to pan.
2294 axis.computedValueRange = [axis.valueWindow[0], axis.valueWindow[1]];
2295 } else if (axis.valueRange) {
2296 // This is a user-set value range for this axis.
2297 axis.computedValueRange = [axis.valueRange[0], axis.valueRange[1]];
2298 } else {
2299 axis.computedValueRange = axis.extremeRange;
f09fc545
DV
2300 }
2301
0d64e596
DV
2302 // Add ticks. By default, all axes inherit the tick positions of the
2303 // primary axis. However, if an axis is specifically marked as having
2304 // independent ticks, then that is permissible as well.
2305 if (i == 0 || axis.independentTicks) {
032e4c1d 2306 axis.ticks =
0d64e596
DV
2307 Dygraph.numericTicks(axis.computedValueRange[0],
2308 axis.computedValueRange[1],
2309 this,
2310 axis);
2311 } else {
2312 var p_axis = this.axes_[0];
2313 var p_ticks = p_axis.ticks;
2314 var p_scale = p_axis.computedValueRange[1] - p_axis.computedValueRange[0];
2315 var scale = axis.computedValueRange[1] - axis.computedValueRange[0];
2316 var tick_values = [];
25f76ae3
DV
2317 for (var k = 0; k < p_ticks.length; k++) {
2318 var y_frac = (p_ticks[k].v - p_axis.computedValueRange[0]) / p_scale;
0d64e596
DV
2319 var y_val = axis.computedValueRange[0] + y_frac * scale;
2320 tick_values.push(y_val);
2321 }
2322
032e4c1d 2323 axis.ticks =
0d64e596
DV
2324 Dygraph.numericTicks(axis.computedValueRange[0],
2325 axis.computedValueRange[1],
2326 this, axis, tick_values);
2327 }
f09fc545 2328 }
f09fc545 2329};
25f76ae3 2330
f09fc545 2331/**
629a09ae 2332 * @private
6a1aa64f
DV
2333 * Calculates the rolling average of a data set.
2334 * If originalData is [label, val], rolls the average of those.
2335 * If originalData is [label, [, it's interpreted as [value, stddev]
2336 * and the roll is returned in the same form, with appropriately reduced
2337 * stddev for each value.
2338 * Note that this is where fractional input (i.e. '5/10') is converted into
2339 * decimal values.
2340 * @param {Array} originalData The data in the appropriate format (see above)
6faebb69
JB
2341 * @param {Number} rollPeriod The number of points over which to average the
2342 * data
6a1aa64f 2343 */
285a6bda 2344Dygraph.prototype.rollingAverage = function(originalData, rollPeriod) {
6a1aa64f
DV
2345 if (originalData.length < 2)
2346 return originalData;
2347 var rollPeriod = Math.min(rollPeriod, originalData.length - 1);
2348 var rollingData = [];
285a6bda 2349 var sigma = this.attr_("sigma");
6a1aa64f
DV
2350
2351 if (this.fractions_) {
2352 var num = 0;
2353 var den = 0; // numerator/denominator
2354 var mult = 100.0;
2355 for (var i = 0; i < originalData.length; i++) {
2356 num += originalData[i][1][0];
2357 den += originalData[i][1][1];
2358 if (i - rollPeriod >= 0) {
2359 num -= originalData[i - rollPeriod][1][0];
2360 den -= originalData[i - rollPeriod][1][1];
2361 }
2362
2363 var date = originalData[i][0];
2364 var value = den ? num / den : 0.0;
285a6bda 2365 if (this.attr_("errorBars")) {
6a1aa64f
DV
2366 if (this.wilsonInterval_) {
2367 // For more details on this confidence interval, see:
2368 // http://en.wikipedia.org/wiki/Binomial_confidence_interval
2369 if (den) {
2370 var p = value < 0 ? 0 : value, n = den;
2371 var pm = sigma * Math.sqrt(p*(1-p)/n + sigma*sigma/(4*n*n));
2372 var denom = 1 + sigma * sigma / den;
2373 var low = (p + sigma * sigma / (2 * den) - pm) / denom;
2374 var high = (p + sigma * sigma / (2 * den) + pm) / denom;
2375 rollingData[i] = [date,
2376 [p * mult, (p - low) * mult, (high - p) * mult]];
2377 } else {
2378 rollingData[i] = [date, [0, 0, 0]];
2379 }
2380 } else {
2381 var stddev = den ? sigma * Math.sqrt(value * (1 - value) / den) : 1.0;
2382 rollingData[i] = [date, [mult * value, mult * stddev, mult * stddev]];
2383 }
2384 } else {
2385 rollingData[i] = [date, mult * value];
2386 }
2387 }
9922b78b 2388 } else if (this.attr_("customBars")) {
f6885d6a
DV
2389 var low = 0;
2390 var mid = 0;
2391 var high = 0;
2392 var count = 0;
6a1aa64f
DV
2393 for (var i = 0; i < originalData.length; i++) {
2394 var data = originalData[i][1];
2395 var y = data[1];
2396 rollingData[i] = [originalData[i][0], [y, y - data[0], data[2] - y]];
f6885d6a 2397
8b91c51f 2398 if (y != null && !isNaN(y)) {
49a7d0d5
DV
2399 low += data[0];
2400 mid += y;
2401 high += data[2];
2402 count += 1;
2403 }
f6885d6a
DV
2404 if (i - rollPeriod >= 0) {
2405 var prev = originalData[i - rollPeriod];
8b91c51f 2406 if (prev[1][1] != null && !isNaN(prev[1][1])) {
49a7d0d5
DV
2407 low -= prev[1][0];
2408 mid -= prev[1][1];
2409 high -= prev[1][2];
2410 count -= 1;
2411 }
f6885d6a 2412 }
502d5996
DV
2413 if (count) {
2414 rollingData[i] = [originalData[i][0], [ 1.0 * mid / count,
2415 1.0 * (mid - low) / count,
2416 1.0 * (high - mid) / count ]];
2417 } else {
2418 rollingData[i] = [originalData[i][0], [null, null, null]];
2419 }
2769de62 2420 }
6a1aa64f
DV
2421 } else {
2422 // Calculate the rolling average for the first rollPeriod - 1 points where
6faebb69 2423 // there is not enough data to roll over the full number of points
6a1aa64f 2424 var num_init_points = Math.min(rollPeriod - 1, originalData.length - 2);
285a6bda 2425 if (!this.attr_("errorBars")){
5011e7a1
DV
2426 if (rollPeriod == 1) {
2427 return originalData;
2428 }
2429
2847c1cf 2430 for (var i = 0; i < originalData.length; i++) {
6a1aa64f 2431 var sum = 0;
5011e7a1 2432 var num_ok = 0;
2847c1cf
DV
2433 for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) {
2434 var y = originalData[j][1];
8b91c51f 2435 if (y == null || isNaN(y)) continue;
5011e7a1 2436 num_ok++;
2847c1cf 2437 sum += originalData[j][1];
6a1aa64f 2438 }
5011e7a1 2439 if (num_ok) {
2847c1cf 2440 rollingData[i] = [originalData[i][0], sum / num_ok];
5011e7a1 2441 } else {
2847c1cf 2442 rollingData[i] = [originalData[i][0], null];
5011e7a1 2443 }
6a1aa64f 2444 }
2847c1cf
DV
2445
2446 } else {
2447 for (var i = 0; i < originalData.length; i++) {
6a1aa64f
DV
2448 var sum = 0;
2449 var variance = 0;
5011e7a1 2450 var num_ok = 0;
2847c1cf 2451 for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) {
5011e7a1 2452 var y = originalData[j][1][0];
8b91c51f 2453 if (y == null || isNaN(y)) continue;
5011e7a1 2454 num_ok++;
6a1aa64f
DV
2455 sum += originalData[j][1][0];
2456 variance += Math.pow(originalData[j][1][1], 2);
2457 }
5011e7a1
DV
2458 if (num_ok) {
2459 var stddev = Math.sqrt(variance) / num_ok;
2460 rollingData[i] = [originalData[i][0],
2461 [sum / num_ok, sigma * stddev, sigma * stddev]];
2462 } else {
2463 rollingData[i] = [originalData[i][0], [null, null, null]];
2464 }
6a1aa64f
DV
2465 }
2466 }
2467 }
2468
2469 return rollingData;
2470};
2471
2472/**
285a6bda
DV
2473 * Detects the type of the str (date or numeric) and sets the various
2474 * formatting attributes in this.attrs_ based on this type.
2475 * @param {String} str An x value.
2476 * @private
2477 */
2478Dygraph.prototype.detectTypeFromString_ = function(str) {
2479 var isDate = false;
ea62df82 2480 if (str.indexOf('-') > 0 ||
285a6bda
DV
2481 str.indexOf('/') >= 0 ||
2482 isNaN(parseFloat(str))) {
2483 isDate = true;
2484 } else if (str.length == 8 && str > '19700101' && str < '20371231') {
2485 // TODO(danvk): remove support for this format.
2486 isDate = true;
2487 }
2488
2489 if (isDate) {
2490 this.attrs_.xValueFormatter = Dygraph.dateString_;
2491 this.attrs_.xValueParser = Dygraph.dateParser;
2492 this.attrs_.xTicker = Dygraph.dateTicker;
bf640e56 2493 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
285a6bda 2494 } else {
17d0210c 2495 // TODO(danvk): use Dygraph.numberFormatter here?
c39e1d93 2496 /** @private (shut up, jsdoc!) */
032e4c1d 2497 this.attrs_.xValueFormatter = function(x) { return x; };
c39e1d93 2498 /** @private (shut up, jsdoc!) */
285a6bda
DV
2499 this.attrs_.xValueParser = function(x) { return parseFloat(x); };
2500 this.attrs_.xTicker = Dygraph.numericTicks;
bf640e56 2501 this.attrs_.xAxisLabelFormatter = this.attrs_.xValueFormatter;
6a1aa64f 2502 }
6a1aa64f
DV
2503};
2504
2505/**
5cd7ac68
DV
2506 * Parses the value as a floating point number. This is like the parseFloat()
2507 * built-in, but with a few differences:
2508 * - the empty string is parsed as null, rather than NaN.
2509 * - if the string cannot be parsed at all, an error is logged.
2510 * If the string can't be parsed, this method returns null.
2511 * @param {String} x The string to be parsed
2512 * @param {Number} opt_line_no The line number from which the string comes.
2513 * @param {String} opt_line The text of the line from which the string comes.
2514 * @private
2515 */
2516
2517// Parse the x as a float or return null if it's not a number.
2518Dygraph.prototype.parseFloat_ = function(x, opt_line_no, opt_line) {
2519 var val = parseFloat(x);
2520 if (!isNaN(val)) return val;
2521
2522 // Try to figure out what happeend.
2523 // If the value is the empty string, parse it as null.
2524 if (/^ *$/.test(x)) return null;
2525
2526 // If it was actually "NaN", return it as NaN.
2527 if (/^ *nan *$/i.test(x)) return NaN;
2528
2529 // Looks like a parsing error.
2530 var msg = "Unable to parse '" + x + "' as a number";
2531 if (opt_line !== null && opt_line_no !== null) {
2532 msg += " on line " + (1+opt_line_no) + " ('" + opt_line + "') of CSV.";
2533 }
2534 this.error(msg);
2535
2536 return null;
2537};
2538
2539/**
629a09ae 2540 * @private
6a1aa64f
DV
2541 * Parses a string in a special csv format. We expect a csv file where each
2542 * line is a date point, and the first field in each line is the date string.
2543 * We also expect that all remaining fields represent series.
285a6bda 2544 * if the errorBars attribute is set, then interpret the fields as:
6a1aa64f 2545 * date, series1, stddev1, series2, stddev2, ...
629a09ae 2546 * @param {[Object]} data See above.
285a6bda 2547 *
629a09ae 2548 * @return [Object] An array with one entry for each row. These entries
285a6bda
DV
2549 * are an array of cells in that row. The first entry is the parsed x-value for
2550 * the row. The second, third, etc. are the y-values. These can take on one of
2551 * three forms, depending on the CSV and constructor parameters:
2552 * 1. numeric value
2553 * 2. [ value, stddev ]
2554 * 3. [ low value, center value, high value ]
6a1aa64f 2555 */
285a6bda 2556Dygraph.prototype.parseCSV_ = function(data) {
6a1aa64f
DV
2557 var ret = [];
2558 var lines = data.split("\n");
3d67f03b
DV
2559
2560 // Use the default delimiter or fall back to a tab if that makes sense.
2561 var delim = this.attr_('delimiter');
2562 if (lines[0].indexOf(delim) == -1 && lines[0].indexOf('\t') >= 0) {
2563 delim = '\t';
2564 }
2565
285a6bda 2566 var start = 0;
d7beab6b
DV
2567 if (!('labels' in this.user_attrs_)) {
2568 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
285a6bda 2569 start = 1;
d7beab6b 2570 this.attrs_.labels = lines[0].split(delim); // NOTE: _not_ user_attrs_.
6a1aa64f 2571 }
5cd7ac68 2572 var line_no = 0;
03b522a4 2573
285a6bda
DV
2574 var xParser;
2575 var defaultParserSet = false; // attempt to auto-detect x value type
2576 var expectedCols = this.attr_("labels").length;
987840a2 2577 var outOfOrder = false;
6a1aa64f
DV
2578 for (var i = start; i < lines.length; i++) {
2579 var line = lines[i];
5cd7ac68 2580 line_no = i;
6a1aa64f 2581 if (line.length == 0) continue; // skip blank lines
3d67f03b
DV
2582 if (line[0] == '#') continue; // skip comment lines
2583 var inFields = line.split(delim);
285a6bda 2584 if (inFields.length < 2) continue;
6a1aa64f
DV
2585
2586 var fields = [];
285a6bda
DV
2587 if (!defaultParserSet) {
2588 this.detectTypeFromString_(inFields[0]);
2589 xParser = this.attr_("xValueParser");
2590 defaultParserSet = true;
2591 }
2592 fields[0] = xParser(inFields[0], this);
6a1aa64f
DV
2593
2594 // If fractions are expected, parse the numbers as "A/B"
2595 if (this.fractions_) {
2596 for (var j = 1; j < inFields.length; j++) {
2597 // TODO(danvk): figure out an appropriate way to flag parse errors.
2598 var vals = inFields[j].split("/");
7219edb3
DV
2599 if (vals.length != 2) {
2600 this.error('Expected fractional "num/den" values in CSV data ' +
2601 "but found a value '" + inFields[j] + "' on line " +
2602 (1 + i) + " ('" + line + "') which is not of this form.");
2603 fields[j] = [0, 0];
2604 } else {
2605 fields[j] = [this.parseFloat_(vals[0], i, line),
2606 this.parseFloat_(vals[1], i, line)];
2607 }
6a1aa64f 2608 }
285a6bda 2609 } else if (this.attr_("errorBars")) {
6a1aa64f 2610 // If there are error bars, values are (value, stddev) pairs
7219edb3
DV
2611 if (inFields.length % 2 != 1) {
2612 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2613 'but line ' + (1 + i) + ' has an odd number of values (' +
2614 (inFields.length - 1) + "): '" + line + "'");
2615 }
2616 for (var j = 1; j < inFields.length; j += 2) {
5cd7ac68
DV
2617 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2618 this.parseFloat_(inFields[j + 1], i, line)];
7219edb3 2619 }
9922b78b 2620 } else if (this.attr_("customBars")) {
6a1aa64f
DV
2621 // Bars are a low;center;high tuple
2622 for (var j = 1; j < inFields.length; j++) {
327a9279
DV
2623 var val = inFields[j];
2624 if (/^ *$/.test(val)) {
2625 fields[j] = [null, null, null];
2626 } else {
2627 var vals = val.split(";");
2628 if (vals.length == 3) {
2629 fields[j] = [ this.parseFloat_(vals[0], i, line),
2630 this.parseFloat_(vals[1], i, line),
2631 this.parseFloat_(vals[2], i, line) ];
2632 } else {
2633 this.warning('When using customBars, values must be either blank ' +
2634 'or "low;center;high" tuples (got "' + val +
2635 '" on line ' + (1+i));
2636 }
2637 }
6a1aa64f
DV
2638 }
2639 } else {
2640 // Values are just numbers
285a6bda 2641 for (var j = 1; j < inFields.length; j++) {
5cd7ac68 2642 fields[j] = this.parseFloat_(inFields[j], i, line);
285a6bda 2643 }
6a1aa64f 2644 }
987840a2
DV
2645 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2646 outOfOrder = true;
2647 }
285a6bda
DV
2648
2649 if (fields.length != expectedCols) {
2650 this.error("Number of columns in line " + i + " (" + fields.length +
2651 ") does not agree with number of labels (" + expectedCols +
2652 ") " + line);
2653 }
6d0aaa09
DV
2654
2655 // If the user specified the 'labels' option and none of the cells of the
2656 // first row parsed correctly, then they probably double-specified the
2657 // labels. We go with the values set in the option, discard this row and
2658 // log a warning to the JS console.
2659 if (i == 0 && this.attr_('labels')) {
2660 var all_null = true;
2661 for (var j = 0; all_null && j < fields.length; j++) {
2662 if (fields[j]) all_null = false;
2663 }
2664 if (all_null) {
2665 this.warn("The dygraphs 'labels' option is set, but the first row of " +
2666 "CSV data ('" + line + "') appears to also contain labels. " +
2667 "Will drop the CSV labels and use the option labels.");
2668 continue;
2669 }
2670 }
2671 ret.push(fields);
6a1aa64f 2672 }
987840a2
DV
2673
2674 if (outOfOrder) {
2675 this.warn("CSV is out of order; order it correctly to speed loading.");
2676 ret.sort(function(a,b) { return a[0] - b[0] });
2677 }
2678
6a1aa64f
DV
2679 return ret;
2680};
2681
2682/**
629a09ae 2683 * @private
285a6bda
DV
2684 * The user has provided their data as a pre-packaged JS array. If the x values
2685 * are numeric, this is the same as dygraphs' internal format. If the x values
2686 * are dates, we need to convert them from Date objects to ms since epoch.
629a09ae
DV
2687 * @param {[Object]} data
2688 * @return {[Object]} data with numeric x values.
285a6bda
DV
2689 */
2690Dygraph.prototype.parseArray_ = function(data) {
2691 // Peek at the first x value to see if it's numeric.
2692 if (data.length == 0) {
2693 this.error("Can't plot empty data set");
2694 return null;
2695 }
2696 if (data[0].length == 0) {
2697 this.error("Data set cannot contain an empty row");
2698 return null;
2699 }
2700
2701 if (this.attr_("labels") == null) {
2702 this.warn("Using default labels. Set labels explicitly via 'labels' " +
2703 "in the options parameter");
2704 this.attrs_.labels = [ "X" ];
2705 for (var i = 1; i < data[0].length; i++) {
2706 this.attrs_.labels.push("Y" + i);
2707 }
2708 }
2709
2dda3850 2710 if (Dygraph.isDateLike(data[0][0])) {
285a6bda
DV
2711 // Some intelligent defaults for a date x-axis.
2712 this.attrs_.xValueFormatter = Dygraph.dateString_;
bf640e56 2713 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
285a6bda
DV
2714 this.attrs_.xTicker = Dygraph.dateTicker;
2715
2716 // Assume they're all dates.
e3ab7b40 2717 var parsedData = Dygraph.clone(data);
285a6bda
DV
2718 for (var i = 0; i < data.length; i++) {
2719 if (parsedData[i].length == 0) {
a323ff4a 2720 this.error("Row " + (1 + i) + " of data is empty");
285a6bda
DV
2721 return null;
2722 }
2723 if (parsedData[i][0] == null
3a909ec5
DV
2724 || typeof(parsedData[i][0].getTime) != 'function'
2725 || isNaN(parsedData[i][0].getTime())) {
be96a1f5 2726 this.error("x value in row " + (1 + i) + " is not a Date");
285a6bda
DV
2727 return null;
2728 }
2729 parsedData[i][0] = parsedData[i][0].getTime();
2730 }
2731 return parsedData;
2732 } else {
2733 // Some intelligent defaults for a numeric x-axis.
c39e1d93 2734 /** @private (shut up, jsdoc!) */
032e4c1d 2735 this.attrs_.xValueFormatter = function(x) { return x; };
285a6bda
DV
2736 this.attrs_.xTicker = Dygraph.numericTicks;
2737 return data;
2738 }
2739};
2740
2741/**
79420a1e
DV
2742 * Parses a DataTable object from gviz.
2743 * The data is expected to have a first column that is either a date or a
2744 * number. All subsequent columns must be numbers. If there is a clear mismatch
2745 * between this.xValueParser_ and the type of the first column, it will be
a685723c 2746 * fixed. Fills out rawData_.
629a09ae 2747 * @param {[Object]} data See above.
79420a1e
DV
2748 * @private
2749 */
285a6bda 2750Dygraph.prototype.parseDataTable_ = function(data) {
79420a1e
DV
2751 var cols = data.getNumberOfColumns();
2752 var rows = data.getNumberOfRows();
2753
d955e223 2754 var indepType = data.getColumnType(0);
4440f6c8 2755 if (indepType == 'date' || indepType == 'datetime') {
285a6bda
DV
2756 this.attrs_.xValueFormatter = Dygraph.dateString_;
2757 this.attrs_.xValueParser = Dygraph.dateParser;
2758 this.attrs_.xTicker = Dygraph.dateTicker;
bf640e56 2759 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
33127159 2760 } else if (indepType == 'number') {
032e4c1d 2761 this.attrs_.xValueFormatter = function(x) { return x; };
285a6bda
DV
2762 this.attrs_.xValueParser = function(x) { return parseFloat(x); };
2763 this.attrs_.xTicker = Dygraph.numericTicks;
bf640e56 2764 this.attrs_.xAxisLabelFormatter = this.attrs_.xValueFormatter;
285a6bda 2765 } else {
987840a2
DV
2766 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2767 "column 1 of DataTable input (Got '" + indepType + "')");
79420a1e
DV
2768 return null;
2769 }
2770
a685723c
DV
2771 // Array of the column indices which contain data (and not annotations).
2772 var colIdx = [];
2773 var annotationCols = {}; // data index -> [annotation cols]
2774 var hasAnnotations = false;
2775 for (var i = 1; i < cols; i++) {
2776 var type = data.getColumnType(i);
2777 if (type == 'number') {
2778 colIdx.push(i);
2779 } else if (type == 'string' && this.attr_('displayAnnotations')) {
2780 // This is OK -- it's an annotation column.
2781 var dataIdx = colIdx[colIdx.length - 1];
2782 if (!annotationCols.hasOwnProperty(dataIdx)) {
2783 annotationCols[dataIdx] = [i];
2784 } else {
2785 annotationCols[dataIdx].push(i);
2786 }
2787 hasAnnotations = true;
2788 } else {
2789 this.error("Only 'number' is supported as a dependent type with Gviz." +
2790 " 'string' is only supported if displayAnnotations is true");
2791 }
2792 }
2793
2794 // Read column labels
2795 // TODO(danvk): add support back for errorBars
2796 var labels = [data.getColumnLabel(0)];
2797 for (var i = 0; i < colIdx.length; i++) {
2798 labels.push(data.getColumnLabel(colIdx[i]));
f9348814 2799 if (this.attr_("errorBars")) i += 1;
a685723c
DV
2800 }
2801 this.attrs_.labels = labels;
2802 cols = labels.length;
2803
79420a1e 2804 var ret = [];
987840a2 2805 var outOfOrder = false;
a685723c 2806 var annotations = [];
79420a1e
DV
2807 for (var i = 0; i < rows; i++) {
2808 var row = [];
debe4434
DV
2809 if (typeof(data.getValue(i, 0)) === 'undefined' ||
2810 data.getValue(i, 0) === null) {
129569a5
FD
2811 this.warn("Ignoring row " + i +
2812 " of DataTable because of undefined or null first column.");
debe4434
DV
2813 continue;
2814 }
2815
c21d2c2d 2816 if (indepType == 'date' || indepType == 'datetime') {
d955e223
DV
2817 row.push(data.getValue(i, 0).getTime());
2818 } else {
2819 row.push(data.getValue(i, 0));
2820 }
3e3f84e4 2821 if (!this.attr_("errorBars")) {
a685723c
DV
2822 for (var j = 0; j < colIdx.length; j++) {
2823 var col = colIdx[j];
2824 row.push(data.getValue(i, col));
2825 if (hasAnnotations &&
2826 annotationCols.hasOwnProperty(col) &&
2827 data.getValue(i, annotationCols[col][0]) != null) {
2828 var ann = {};
2829 ann.series = data.getColumnLabel(col);
2830 ann.xval = row[0];
2831 ann.shortText = String.fromCharCode(65 /* A */ + annotations.length)
2832 ann.text = '';
2833 for (var k = 0; k < annotationCols[col].length; k++) {
2834 if (k) ann.text += "\n";
2835 ann.text += data.getValue(i, annotationCols[col][k]);
2836 }
2837 annotations.push(ann);
2838 }
3e3f84e4 2839 }
92fd68d8
DV
2840
2841 // Strip out infinities, which give dygraphs problems later on.
2842 for (var j = 0; j < row.length; j++) {
2843 if (!isFinite(row[j])) row[j] = null;
2844 }
3e3f84e4
DV
2845 } else {
2846 for (var j = 0; j < cols - 1; j++) {
2847 row.push([ data.getValue(i, 1 + 2 * j), data.getValue(i, 2 + 2 * j) ]);
2848 }
79420a1e 2849 }
987840a2
DV
2850 if (ret.length > 0 && row[0] < ret[ret.length - 1][0]) {
2851 outOfOrder = true;
2852 }
243d96e8 2853 ret.push(row);
79420a1e 2854 }
987840a2
DV
2855
2856 if (outOfOrder) {
2857 this.warn("DataTable is out of order; order it correctly to speed loading.");
2858 ret.sort(function(a,b) { return a[0] - b[0] });
2859 }
a685723c
DV
2860 this.rawData_ = ret;
2861
2862 if (annotations.length > 0) {
2863 this.setAnnotations(annotations, true);
2864 }
79420a1e
DV
2865}
2866
629a09ae 2867/**
6a1aa64f
DV
2868 * Get the CSV data. If it's in a function, call that function. If it's in a
2869 * file, do an XMLHttpRequest to get it.
2870 * @private
2871 */
285a6bda 2872Dygraph.prototype.start_ = function() {
6a1aa64f 2873 if (typeof this.file_ == 'function') {
285a6bda 2874 // CSV string. Pretend we got it via XHR.
6a1aa64f 2875 this.loadedEvent_(this.file_());
2dda3850 2876 } else if (Dygraph.isArrayLike(this.file_)) {
285a6bda 2877 this.rawData_ = this.parseArray_(this.file_);
26ca7938 2878 this.predraw_();
79420a1e
DV
2879 } else if (typeof this.file_ == 'object' &&
2880 typeof this.file_.getColumnRange == 'function') {
2881 // must be a DataTable from gviz.
a685723c 2882 this.parseDataTable_(this.file_);
26ca7938 2883 this.predraw_();
285a6bda
DV
2884 } else if (typeof this.file_ == 'string') {
2885 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2886 if (this.file_.indexOf('\n') >= 0) {
2887 this.loadedEvent_(this.file_);
2888 } else {
2889 var req = new XMLHttpRequest();
2890 var caller = this;
2891 req.onreadystatechange = function () {
2892 if (req.readyState == 4) {
39338e74
DV
2893 if (req.status == 200 || // Normal http
2894 req.status == 0) { // Chrome w/ --allow-file-access-from-files
285a6bda
DV
2895 caller.loadedEvent_(req.responseText);
2896 }
6a1aa64f 2897 }
285a6bda 2898 };
6a1aa64f 2899
285a6bda
DV
2900 req.open("GET", this.file_, true);
2901 req.send(null);
2902 }
2903 } else {
2904 this.error("Unknown data format: " + (typeof this.file_));
6a1aa64f
DV
2905 }
2906};
2907
2908/**
2909 * Changes various properties of the graph. These can include:
2910 * <ul>
2911 * <li>file: changes the source data for the graph</li>
2912 * <li>errorBars: changes whether the data contains stddev</li>
2913 * </ul>
dcb25130 2914 *
ccfcc169
DV
2915 * There's a huge variety of options that can be passed to this method. For a
2916 * full list, see http://dygraphs.com/options.html.
2917 *
6a1aa64f 2918 * @param {Object} attrs The new properties and values
ccfcc169
DV
2919 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
2920 * call to updateOptions(). If you know better, you can pass true to explicitly
2921 * block the redraw. This can be useful for chaining updateOptions() calls,
2922 * avoiding the occasional infinite loop and preventing redraws when it's not
2923 * necessary (e.g. when updating a callback).
6a1aa64f 2924 */
ccfcc169
DV
2925Dygraph.prototype.updateOptions = function(attrs, block_redraw) {
2926 if (typeof(block_redraw) == 'undefined') block_redraw = false;
2927
2928 // TODO(danvk): this is a mess. Move these options into attr_.
c65f2303 2929 if ('rollPeriod' in attrs) {
6a1aa64f
DV
2930 this.rollPeriod_ = attrs.rollPeriod;
2931 }
c65f2303 2932 if ('dateWindow' in attrs) {
6a1aa64f 2933 this.dateWindow_ = attrs.dateWindow;
e5152598 2934 if (!('isZoomedIgnoreProgrammaticZoom' in attrs)) {
81856f70
NN
2935 this.zoomed_x_ = attrs.dateWindow != null;
2936 }
b7e5862d 2937 }
e5152598 2938 if ('valueRange' in attrs && !('isZoomedIgnoreProgrammaticZoom' in attrs)) {
b7e5862d 2939 this.zoomed_y_ = attrs.valueRange != null;
6a1aa64f 2940 }
450fe64b
DV
2941
2942 // TODO(danvk): validate per-series options.
46dde5f9
DV
2943 // Supported:
2944 // strokeWidth
2945 // pointSize
2946 // drawPoints
2947 // highlightCircleSize
450fe64b 2948
fc80a396 2949 Dygraph.update(this.user_attrs_, attrs);
285a6bda 2950
5e50289f 2951 if (attrs['file']) {
6a1aa64f 2952 this.file_ = attrs['file'];
ccfcc169 2953 if (!block_redraw) this.start_();
6a1aa64f 2954 } else {
ccfcc169 2955 if (!block_redraw) this.predraw_();
6a1aa64f
DV
2956 }
2957};
2958
2959/**
697e70b2
DV
2960 * Resizes the dygraph. If no parameters are specified, resizes to fill the
2961 * containing div (which has presumably changed size since the dygraph was
2962 * instantiated. If the width/height are specified, the div will be resized.
964f30c6
DV
2963 *
2964 * This is far more efficient than destroying and re-instantiating a
2965 * Dygraph, since it doesn't have to reparse the underlying data.
2966 *
629a09ae
DV
2967 * @param {Number} [width] Width (in pixels)
2968 * @param {Number} [height] Height (in pixels)
697e70b2
DV
2969 */
2970Dygraph.prototype.resize = function(width, height) {
e8c7ef86
DV
2971 if (this.resize_lock) {
2972 return;
2973 }
2974 this.resize_lock = true;
2975
697e70b2
DV
2976 if ((width === null) != (height === null)) {
2977 this.warn("Dygraph.resize() should be called with zero parameters or " +
2978 "two non-NULL parameters. Pretending it was zero.");
2979 width = height = null;
2980 }
2981
b16e6369 2982 // TODO(danvk): there should be a clear() method.
697e70b2 2983 this.maindiv_.innerHTML = "";
b16e6369
DV
2984 this.attrs_.labelsDiv = null;
2985
697e70b2
DV
2986 if (width) {
2987 this.maindiv_.style.width = width + "px";
2988 this.maindiv_.style.height = height + "px";
2989 this.width_ = width;
2990 this.height_ = height;
2991 } else {
2992 this.width_ = this.maindiv_.offsetWidth;
2993 this.height_ = this.maindiv_.offsetHeight;
2994 }
2995
2996 this.createInterface_();
26ca7938 2997 this.predraw_();
e8c7ef86
DV
2998
2999 this.resize_lock = false;
697e70b2
DV
3000};
3001
3002/**
6faebb69 3003 * Adjusts the number of points in the rolling average. Updates the graph to
6a1aa64f 3004 * reflect the new averaging period.
6faebb69 3005 * @param {Number} length Number of points over which to average the data.
6a1aa64f 3006 */
285a6bda 3007Dygraph.prototype.adjustRoll = function(length) {
6a1aa64f 3008 this.rollPeriod_ = length;
26ca7938 3009 this.predraw_();
6a1aa64f 3010};
540d00f1 3011
f8cfec73 3012/**
1cf11047
DV
3013 * Returns a boolean array of visibility statuses.
3014 */
3015Dygraph.prototype.visibility = function() {
3016 // Do lazy-initialization, so that this happens after we know the number of
3017 // data series.
3018 if (!this.attr_("visibility")) {
f38dec01 3019 this.attrs_["visibility"] = [];
1cf11047
DV
3020 }
3021 while (this.attr_("visibility").length < this.rawData_[0].length - 1) {
f38dec01 3022 this.attr_("visibility").push(true);
1cf11047
DV
3023 }
3024 return this.attr_("visibility");
3025};
3026
3027/**
3028 * Changes the visiblity of a series.
3029 */
3030Dygraph.prototype.setVisibility = function(num, value) {
3031 var x = this.visibility();
a6c109c1 3032 if (num < 0 || num >= x.length) {
1cf11047
DV
3033 this.warn("invalid series number in setVisibility: " + num);
3034 } else {
3035 x[num] = value;
26ca7938 3036 this.predraw_();
1cf11047
DV
3037 }
3038};
3039
3040/**
0cb9bd91
DV
3041 * How large of an area will the dygraph render itself in?
3042 * This is used for testing.
3043 * @return A {width: w, height: h} object.
3044 * @private
3045 */
3046Dygraph.prototype.size = function() {
3047 return { width: this.width_, height: this.height_ };
3048};
3049
3050/**
5c528fa2
DV
3051 * Update the list of annotations and redraw the chart.
3052 */
a685723c 3053Dygraph.prototype.setAnnotations = function(ann, suppressDraw) {
3c51ab74
DV
3054 // Only add the annotation CSS rule once we know it will be used.
3055 Dygraph.addAnnotationRule();
5c528fa2
DV
3056 this.annotations_ = ann;
3057 this.layout_.setAnnotations(this.annotations_);
a685723c 3058 if (!suppressDraw) {
26ca7938 3059 this.predraw_();
a685723c 3060 }
5c528fa2
DV
3061};
3062
3063/**
3064 * Return the list of annotations.
3065 */
3066Dygraph.prototype.annotations = function() {
3067 return this.annotations_;
3068};
3069
46dde5f9
DV
3070/**
3071 * Get the index of a series (column) given its name. The first column is the
3072 * x-axis, so the data series start with index 1.
3073 */
3074Dygraph.prototype.indexFromSetName = function(name) {
3075 var labels = this.attr_("labels");
3076 for (var i = 0; i < labels.length; i++) {
3077 if (labels[i] == name) return i;
3078 }
3079 return null;
3080};
3081
629a09ae
DV
3082/**
3083 * @private
3084 * Adds a default style for the annotation CSS classes to the document. This is
3085 * only executed when annotations are actually used. It is designed to only be
3086 * called once -- all calls after the first will return immediately.
3087 */
5c528fa2
DV
3088Dygraph.addAnnotationRule = function() {
3089 if (Dygraph.addedAnnotationCSS) return;
3090
5c528fa2
DV
3091 var rule = "border: 1px solid black; " +
3092 "background-color: white; " +
3093 "text-align: center;";
22186871
DV
3094
3095 var styleSheetElement = document.createElement("style");
3096 styleSheetElement.type = "text/css";
3097 document.getElementsByTagName("head")[0].appendChild(styleSheetElement);
3098
3099 // Find the first style sheet that we can access.
3100 // We may not add a rule to a style sheet from another domain for security
3101 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3102 // adds its own style sheets from google.com.
3103 for (var i = 0; i < document.styleSheets.length; i++) {
3104 if (document.styleSheets[i].disabled) continue;
3105 var mysheet = document.styleSheets[i];
3106 try {
3107 if (mysheet.insertRule) { // Firefox
3108 var idx = mysheet.cssRules ? mysheet.cssRules.length : 0;
3109 mysheet.insertRule(".dygraphDefaultAnnotation { " + rule + " }", idx);
3110 } else if (mysheet.addRule) { // IE
3111 mysheet.addRule(".dygraphDefaultAnnotation", rule);
3112 }
3113 Dygraph.addedAnnotationCSS = true;
3114 return;
3115 } catch(err) {
3116 // Was likely a security exception.
3117 }
5c528fa2
DV
3118 }
3119
22186871 3120 this.warn("Unable to add default annotation CSS rule; display may be off.");
5c528fa2
DV
3121}
3122
285a6bda
DV
3123// Older pages may still use this name.
3124DateGraph = Dygraph;