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