3 * Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
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)
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
22 The CSV file is of the form
24 Date,SeriesA,SeriesB,SeriesC
28 If the 'errorBars' option is set in the constructor, the input should be of
30 Date,SeriesA,SeriesB,...
31 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
32 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
34 If the 'fractions' option is set, the input should be of the form:
36 Date,SeriesA,SeriesB,...
37 YYYYMMDD,A1/B1,A2/B2,...
38 YYYYMMDD,A1/B1,A2/B2,...
40 And error bars will be calculated automatically using a binomial distribution.
42 For further documentation and examples, see http://dygraphs.com/
46 /*jshint globalstrict: true */
47 /*global DygraphRangeSelector:false, DygraphLayout:false, DygraphCanvasRenderer:false, G_vmlCanvasManager:false */
51 * Creates an interactive, zoomable chart.
54 * @param {div | String} div A div or the id of a div into which to construct
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.
64 var Dygraph
= function(div
, data
, opts
, opt_fourth_param
) {
65 if (opt_fourth_param
!== undefined
) {
66 // Old versions of dygraphs took in the series labels as a constructor
67 // parameter. This doesn't make sense anymore, but it's easy to continue
68 // to support this usage.
69 this.warn("Using deprecated four-argument dygraph constructor");
70 this.__old_init__(div
, data
, opts
, opt_fourth_param
);
72 this.__init__(div
, data
, opts
);
76 Dygraph
.NAME
= "Dygraph";
77 Dygraph
.VERSION
= "1.2";
78 Dygraph
.__repr__
= function() {
79 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
83 * Returns information about the Dygraph class.
85 Dygraph
.toString
= function() {
86 return this.__repr__();
89 // Various default values
90 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
91 Dygraph
.DEFAULT_WIDTH
= 480;
92 Dygraph
.DEFAULT_HEIGHT
= 320;
94 Dygraph
.ANIMATION_STEPS
= 10;
95 Dygraph
.ANIMATION_DURATION
= 200;
97 // These are defined before DEFAULT_ATTRS so that it can refer to them.
100 * Return a string version of a number. This respects the digitsAfterDecimal
101 * and maxNumberWidth options.
102 * @param {Number} x The number to be formatted
103 * @param {Dygraph} opts An options view
104 * @param {String} name The name of the point's data series
105 * @param {Dygraph} g The dygraph object
107 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
108 var sigFigs
= opts('sigFigs');
110 if (sigFigs
!== null) {
111 // User has opted for a fixed number of significant figures.
112 return Dygraph
.floatFormat(x
, sigFigs
);
115 var digits
= opts('digitsAfterDecimal');
116 var maxNumberWidth
= opts('maxNumberWidth');
118 // switch to scientific notation if we underflow or overflow fixed display.
120 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
121 Math
.abs(x
) < Math
.pow(10, -digits
))) {
122 return x
.toExponential(digits
);
124 return '' + Dygraph
.round_(x
, digits
);
129 * variant for use as an axisLabelFormatter.
132 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
133 return Dygraph
.numberValueFormatter(x
, opts
, g
);
137 * Convert a JS date (millis since epoch) to YYYY/MM/DD
138 * @param {Number} date The JavaScript date (ms since epoch)
139 * @return {String} A date of the form "YYYY/MM/DD"
142 Dygraph
.dateString_
= function(date
) {
143 var zeropad
= Dygraph
.zeropad
;
144 var d
= new Date(date
);
147 var year
= "" + d
.getFullYear();
148 // Get a 0 padded month string
149 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
150 // Get a 0 padded day string
151 var day
= zeropad(d
.getDate());
154 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
155 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
157 return year
+ "/" + month + "/" + day
+ ret
;
161 * Convert a JS date to a string appropriate to display on an axis that
162 * is displaying values at the stated granularity.
163 * @param {Date} date The date to format
164 * @param {Number} granularity One of the Dygraph granularity constants
165 * @return {String} The formatted date
168 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
169 if (granularity
>= Dygraph
.DECADAL
) {
170 return date
.strftime('%Y');
171 } else if (granularity
>= Dygraph
.MONTHLY
) {
172 return date
.strftime('%b %y');
174 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
175 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
176 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
178 return Dygraph
.hmsString_(date
.getTime());
184 * Standard plotters. These may be used by clients.
185 * Available plotters are:
186 * - Dygraph.Plotters.linePlotter: draws central lines (most common)
187 * - Dygraph.Plotters.errorPlotter: draws error bars
188 * - Dygraph.Plotters.fillPlotter: draws fills under lines (used with fillGraph)
190 * By default, the plotter is [fillPlotter, errorPlotter, linePlotter].
191 * This causes all the lines to be drawn over all the fills/error bars.
193 Dygraph
.Plotters
= DygraphCanvasRenderer
._Plotters
;
196 // Default attribute values.
197 Dygraph
.DEFAULT_ATTRS
= {
198 highlightCircleSize
: 3,
199 highlightSeriesOpts
: null,
200 highlightSeriesBackgroundAlpha
: 0.5,
204 // TODO(danvk): move defaults from createStatusMessage_ here.
206 labelsSeparateLines
: false,
207 labelsShowZeroValues
: true,
210 showLabelsOnHighlight
: true,
212 digitsAfterDecimal
: 2,
217 strokeBorderWidth
: 0,
218 strokeBorderColor
: "white",
221 axisLabelFontSize
: 14,
227 xValueParser
: Dygraph
.dateParser
,
234 wilsonInterval
: true, // only relevant if fractions is true
238 connectSeparatedPoints
: false,
241 hideOverlayOnMouseOut
: true,
243 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
244 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
248 drawAxesAtZero
: false,
250 // Sizes of the various chart labels.
257 axisLineColor
: "black",
260 axisLabelColor
: "black",
261 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
265 gridLineColor
: "rgb(128,128,128)",
267 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
268 animatedZooms
: false, // (for now)
270 // Range selector options
271 showRangeSelector
: false,
272 rangeSelectorHeight
: 40,
273 rangeSelectorPlotStrokeColor
: "#808FAB",
274 rangeSelectorPlotFillColor
: "#A7B1C4",
276 // The ordering here ensures that central lines always appear above any
277 // fill bars/error bars
.
279 Dygraph
.Plotters
.fillPlotter
,
280 Dygraph
.Plotters
.errorPlotter
,
281 Dygraph
.Plotters
.linePlotter
288 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
289 valueFormatter
: Dygraph
.dateString_
,
290 ticker
: null // will be set in dygraph-tickers.js
294 valueFormatter
: Dygraph
.numberValueFormatter
,
295 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
296 ticker
: null // will be set in dygraph-tickers.js
300 valueFormatter
: Dygraph
.numberValueFormatter
,
301 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
302 ticker
: null // will be set in dygraph-tickers.js
307 // Directions for panning and zooming. Use bit operations when combined
308 // values are possible.
309 Dygraph
.HORIZONTAL
= 1;
310 Dygraph
.VERTICAL
= 2;
312 // Installed plugins, in order of precedence (most-general to most-specific).
313 // Plugins are installed after they are defined, in plugins/install.js
.
317 // Used for initializing annotation CSS rules only once.
318 Dygraph
.addedAnnotationCSS
= false;
320 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
321 // Labels is no longer a constructor parameter, since it's typically set
322 // directly from the data source. It also conains a name for the x-axis,
323 // which the previous constructor form did not.
324 if (labels
!== null) {
325 var new_labels
= ["Date"];
326 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
327 Dygraph
.update(attrs
, { 'labels': new_labels
});
329 this.__init__(div
, file
, attrs
);
333 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
334 * and context <canvas> inside of it. See the constructor for details.
336 * @param {Element} div the Element to render the graph into.
337 * @param {String | Function} file Source data
338 * @param {Object} attrs Miscellaneous other options
341 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
342 // Hack for IE: if we're using excanvas and the document hasn't finished
343 // loading yet (and hence may not have initialized whatever it needs to
344 // initialize), then keep calling this routine periodically until it has.
345 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
346 typeof(G_vmlCanvasManager
) != 'undefined' &&
347 document
.readyState
!= 'complete') {
349 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
353 // Support two-argument constructor
354 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
356 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
358 if (typeof(div
) == 'string') {
359 div
= document
.getElementById(div
);
363 Dygraph
.error("Constructing dygraph with a non-existent div!");
367 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
369 // Copy the important bits into the object
370 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
373 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
374 this.previousVerticalX_
= -1;
375 this.fractions_
= attrs
.fractions
|| false;
376 this.dateWindow_
= attrs
.dateWindow
|| null;
378 this.is_initial_draw_
= true;
379 this.annotations_
= [];
381 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
382 this.zoomed_x_
= false;
383 this.zoomed_y_
= false;
385 // Clear the div. This ensure that, if multiple dygraphs are passed the same
386 // div, then only one will be drawn.
389 // For historical reasons, the 'width' and 'height' options trump all CSS
390 // rules _except_ for an explicit 'width' or 'height' on the div.
391 // As an added convenience, if the div has zero height (like <div></div> does
392 // without any styles), then we use a default height/width
.
393 if (div
.style
.width
=== '' && attrs
.width
) {
394 div
.style
.width
= attrs
.width
+ "px";
396 if (div
.style
.height
=== '' && attrs
.height
) {
397 div
.style
.height
= attrs
.height
+ "px";
399 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
400 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
401 if (div
.style
.width
=== '') {
402 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
405 // these will be zero if the dygraph's div is hidden.
406 this.width_
= div
.clientWidth
;
407 this.height_
= div
.clientHeight
;
409 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
410 if (attrs
.stackedGraph
) {
411 attrs
.fillGraph
= true;
412 // TODO(nikhilk): Add any other stackedGraph checks here.
415 // These two options have a bad interaction. See issue 359.
416 if (attrs
.showRangeSelector
&& attrs
.animatedZooms
) {
417 this.warn('You should not set animatedZooms=true when using the range selector.');
418 attrs
.animatedZooms
= false;
421 // DEPRECATION WARNING: All option processing should be moved from
422 // attrs_ and user_attrs_ to options_, which holds all this information.
424 // Dygraphs has many options, some of which interact with one another.
425 // To keep track of everything, we maintain two sets of options:
427 // this.user_attrs_ only options explicitly set by the user.
428 // this.attrs_ defaults, options derived from user_attrs_, data.
430 // Options are then accessed this.attr_('attr'), which first looks at
431 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
432 // defaults without overriding behavior that the user specifically asks for.
433 this.user_attrs_
= {};
434 Dygraph
.update(this.user_attrs_
, attrs
);
436 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
438 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
440 this.boundaryIds_
= [];
441 this.setIndexByName_
= {};
442 this.datasetIndex_
= [];
444 this.registeredEvents_
= [];
445 this.eventListeners_
= {};
447 this.attributes_
= new DygraphOptions(this);
449 // Create the containing DIV and other interactive elements
450 this.createInterface_();
454 for (var i
= 0; i
< Dygraph
.PLUGINS
.length
; i
++) {
455 var Plugin
= Dygraph
.PLUGINS
[i
];
456 var pluginInstance
= new Plugin();
458 plugin
: pluginInstance
,
464 var handlers
= pluginInstance
.activate(this);
465 for (var eventName
in handlers
) {
466 // TODO(danvk): validate eventName.
467 pluginDict
.events
[eventName
] = handlers
[eventName
];
470 this.plugins_
.push(pluginDict
);
473 // At this point, plugins can no longer register event handlers.
474 // Construct a map from event -> ordered list of [callback, plugin].
475 for (var i
= 0; i
< this.plugins_
.length
; i
++) {
476 var plugin_dict
= this.plugins_
[i
];
477 for (var eventName
in plugin_dict
.events
) {
478 if (!plugin_dict
.events
.hasOwnProperty(eventName
)) continue;
479 var callback
= plugin_dict
.events
[eventName
];
481 var pair
= [plugin_dict
.plugin
, callback
];
482 if (!(eventName
in this.eventListeners_
)) {
483 this.eventListeners_
[eventName
] = [pair
];
485 this.eventListeners_
[eventName
].push(pair
);
494 * Triggers a cascade of events to the various plugins which are interested in them.
495 * Returns true if the "default behavior" should be performed, i.e. if none of
496 * the event listeners called event.preventDefault().
499 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
500 if (!(name
in this.eventListeners_
)) return true;
502 // QUESTION: can we use objects & prototypes to speed this up?
506 defaultPrevented
: false,
507 preventDefault
: function() {
508 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
509 e
.defaultPrevented
= true;
511 propagationStopped
: false,
512 stopPropagation
: function() {
513 e
.propagationStopped
= true;
516 Dygraph
.update(e
, extra_props
);
518 var callback_plugin_pairs
= this.eventListeners_
[name
];
519 if (callback_plugin_pairs
) {
520 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
521 var plugin
= callback_plugin_pairs
[i
][0];
522 var callback
= callback_plugin_pairs
[i
][1];
523 callback
.call(plugin
, e
);
524 if (e
.propagationStopped
) break;
527 return e
.defaultPrevented
;
531 * Returns the zoomed status of the chart for one or both axes.
533 * Axis is an optional parameter. Can be set to 'x' or 'y'.
535 * The zoomed status for an axis is set whenever a user zooms using the mouse
536 * or when the dateWindow or valueRange are updated (unless the
537 * isZoomedIgnoreProgrammaticZoom option is also specified).
539 Dygraph
.prototype.isZoomed
= function(axis
) {
540 if (axis
=== null || axis
=== undefined
) {
541 return this.zoomed_x_
|| this.zoomed_y_
;
543 if (axis
=== 'x') return this.zoomed_x_
;
544 if (axis
=== 'y') return this.zoomed_y_
;
545 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
549 * Returns information about the Dygraph object, including its containing ID.
551 Dygraph
.prototype.toString
= function() {
552 var maindiv
= this.maindiv_
;
553 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
554 return "[Dygraph " + id
+ "]";
559 * Returns the value of an option. This may be set by the user (either in the
560 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
562 * @param { String } name The name of the option, e.g. 'rollPeriod'.
563 * @param { String } [seriesName] The name of the series to which the option
564 * will be applied. If no per-series value of this option is available, then
565 * the global value is returned. This is optional.
566 * @return { ... } The value of the option.
568 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
569 // <REMOVE_FOR_COMBINED>
570 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
571 this.error('Must include options reference JS for testing');
572 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
573 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
574 'in the Dygraphs.OPTIONS_REFERENCE listing.');
575 // Only log this error once.
576 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
578 // </REMOVE_FOR_COMBINED
>
579 return seriesName
? this.attributes_
.getForSeries(name
, seriesName
) : this.attributes_
.get(name
);
583 * Returns the current value for an option, as set in the constructor or via
584 * updateOptions. You may pass in an (optional) series name to get per-series
585 * values for the option.
587 * All values returned by this method should be considered immutable. If you
588 * modify them, there is no guarantee that the changes will be honored or that
589 * dygraphs will remain in a consistent state. If you want to modify an option,
590 * use updateOptions() instead.
592 * @param { String } name The name of the option (e.g. 'strokeWidth')
593 * @param { String } [opt_seriesName] Series name to get per-series values.
594 * @return { ... } The value of the option.
596 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
597 return this.attr_(name
, opt_seriesName
);
602 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
603 * @return { ... } A function mapping string -> option value
605 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
607 return function(opt
) {
608 var axis_opts
= self
.user_attrs_
.axes
;
609 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
610 return axis_opts
[axis
][opt
];
612 // user-specified attributes always trump defaults, even if they're less
614 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
615 return self
.user_attrs_
[opt
];
618 axis_opts
= self
.attrs_
.axes
;
619 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
620 return axis_opts
[axis
][opt
];
622 // check old-style axis options
623 // TODO(danvk): add a deprecation warning if either of these match.
624 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
625 return self
.axes_
[0][opt
];
626 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
627 return self
.axes_
[1][opt
];
629 return self
.attr_(opt
);
634 * Returns the current rolling period, as set by the user or an option.
635 * @return {Number} The number of points in the rolling window
637 Dygraph
.prototype.rollPeriod
= function() {
638 return this.rollPeriod_
;
642 * Returns the currently-visible x-range. This can be affected by zooming,
643 * panning or a call to updateOptions.
644 * Returns a two-element array: [left, right].
645 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
647 Dygraph
.prototype.xAxisRange
= function() {
648 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
652 * Returns the lower- and upper-bound x-axis values of the
655 Dygraph
.prototype.xAxisExtremes
= function() {
656 var left
= this.rawData_
[0][0];
657 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
658 return [left
, right
];
662 * Returns the currently-visible y-range for an axis. This can be affected by
663 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
664 * called with no arguments, returns the range of the first axis.
665 * Returns a two-element array: [bottom, top].
667 Dygraph
.prototype.yAxisRange
= function(idx
) {
668 if (typeof(idx
) == "undefined") idx
= 0;
669 if (idx
< 0 || idx
>= this.axes_
.length
) {
672 var axis
= this.axes_
[idx
];
673 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
677 * Returns the currently-visible y-ranges for each axis. This can be affected by
678 * zooming, panning, calls to updateOptions, etc.
679 * Returns an array of [bottom, top] pairs, one for each y-axis.
681 Dygraph
.prototype.yAxisRanges
= function() {
683 for (var i
= 0; i
< this.axes_
.length
; i
++) {
684 ret
.push(this.yAxisRange(i
));
689 // TODO(danvk): use these functions throughout dygraphs.
691 * Convert from data coordinates to canvas/div X/Y coordinates.
692 * If specified, do this conversion for the coordinate system of a particular
693 * axis. Uses the first axis by default.
694 * Returns a two-element array: [X, Y]
696 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
697 * instead of toDomCoords(null, y, axis).
699 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
700 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
704 * Convert from data x coordinates to canvas/div X coordinate.
705 * If specified, do this conversion for the coordinate system of a particular
707 * Returns a single value or null if x is null.
709 Dygraph
.prototype.toDomXCoord
= function(x
) {
714 var area
= this.plotter_
.area
;
715 var xRange
= this.xAxisRange();
716 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
720 * Convert from data x coordinates to canvas/div Y coordinate and optional
721 * axis. Uses the first axis by default.
723 * returns a single value or null if y is null.
725 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
726 var pct
= this.toPercentYCoord(y
, axis
);
731 var area
= this.plotter_
.area
;
732 return area
.y
+ pct
* area
.h
;
736 * Convert from canvas/div coords to data coordinates.
737 * If specified, do this conversion for the coordinate system of a particular
738 * axis. Uses the first axis by default.
739 * Returns a two-element array: [X, Y].
741 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
742 * instead of toDataCoords(null, y, axis).
744 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
745 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
749 * Convert from canvas/div x coordinate to data coordinate.
751 * If x is null, this returns null.
753 Dygraph
.prototype.toDataXCoord
= function(x
) {
758 var area
= this.plotter_
.area
;
759 var xRange
= this.xAxisRange();
760 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
764 * Convert from canvas/div y coord to value.
766 * If y is null, this returns null.
767 * if axis is null, this uses the first axis.
769 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
774 var area
= this.plotter_
.area
;
775 var yRange
= this.yAxisRange(axis
);
777 if (typeof(axis
) == "undefined") axis
= 0;
778 if (!this.axes_
[axis
].logscale
) {
779 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
781 // Computing the inverse of toDomCoord.
782 var pct
= (y
- area
.y
) / area
.h
;
784 // Computing the inverse of toPercentYCoord. The function was arrived at with
785 // the following steps:
787 // Original calcuation:
788 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
790 // Move denominator to both sides:
791 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
793 // subtract logr1, and take the negative value.
794 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
796 // Swap both sides of the equation, and we can compute the log of the
797 // return value. Which means we just need to use that as the exponent in
799 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
801 var logr1
= Dygraph
.log10(yRange
[1]);
802 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
803 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
809 * Converts a y for an axis to a percentage from the top to the
810 * bottom of the drawing area.
812 * If the coordinate represents a value visible on the canvas, then
813 * the value will be between 0 and 1, where 0 is the top of the canvas.
814 * However, this method will return values outside the range, as
815 * values can fall outside the canvas.
817 * If y is null, this returns null.
818 * if axis is null, this uses the first axis.
820 * @param { Number } y The data y-coordinate.
821 * @param { Number } [axis] The axis number on which the data coordinate lives.
822 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
824 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
828 if (typeof(axis
) == "undefined") axis
= 0;
830 var yRange
= this.yAxisRange(axis
);
833 if (!this.axes_
[axis
].logscale
) {
834 // yRange[1] - y is unit distance from the bottom.
835 // yRange[1] - yRange[0] is the scale of the range.
836 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
837 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
839 var logr1
= Dygraph
.log10(yRange
[1]);
840 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
846 * Converts an x value to a percentage from the left to the right of
849 * If the coordinate represents a value visible on the canvas, then
850 * the value will be between 0 and 1, where 0 is the left of the canvas.
851 * However, this method will return values outside the range, as
852 * values can fall outside the canvas.
854 * If x is null, this returns null.
855 * @param { Number } x The data x-coordinate.
856 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
858 Dygraph
.prototype.toPercentXCoord
= function(x
) {
863 var xRange
= this.xAxisRange();
864 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
868 * Returns the number of columns (including the independent variable).
869 * @return { Integer } The number of columns.
871 Dygraph
.prototype.numColumns
= function() {
872 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
876 * Returns the number of rows (excluding any header/label row).
877 * @return { Integer } The number of rows, less any header.
879 Dygraph
.prototype.numRows
= function() {
880 return this.rawData_
.length
;
884 * Returns the full range of the x-axis, as determined by the most extreme
885 * values in the data set. Not affected by zooming, visibility, etc.
886 * TODO(danvk): merge w/ xAxisExtremes
887 * @return { Array<Number> } A [low, high] pair
890 Dygraph
.prototype.fullXRange_
= function() {
891 if (this.numRows() > 0) {
892 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
899 * Returns the value in the given row and column. If the row and column exceed
900 * the bounds on the data, returns null. Also returns null if the value is
902 * @param { Number} row The row number of the data (0-based). Row 0 is the
903 * first row of data, not a header row.
904 * @param { Number} col The column number of the data (0-based)
905 * @return { Number } The value in the specified cell or null if the row/col
908 Dygraph
.prototype.getValue
= function(row
, col
) {
909 if (row
< 0 || row
> this.rawData_
.length
) return null;
910 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
912 return this.rawData_
[row
][col
];
916 * Generates interface elements for the Dygraph: a containing div, a div to
917 * display the current point, and a textbox to adjust the rolling average
918 * period. Also creates the Renderer/Layout elements.
921 Dygraph
.prototype.createInterface_
= function() {
922 // Create the all-enclosing graph div
923 var enclosing
= this.maindiv_
;
925 this.graphDiv
= document
.createElement("div");
926 this.graphDiv
.style
.width
= this.width_
+ "px";
927 this.graphDiv
.style
.height
= this.height_
+ "px";
928 enclosing
.appendChild(this.graphDiv
);
930 // Create the canvas for interactive parts of the chart.
931 this.canvas_
= Dygraph
.createCanvas();
932 this.canvas_
.style
.position
= "absolute";
933 this.canvas_
.width
= this.width_
;
934 this.canvas_
.height
= this.height_
;
935 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
936 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
938 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
940 // ... and for static parts of the chart.
941 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
942 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
944 if (this.attr_('showRangeSelector')) {
945 // The range selector must be created here so that its canvases and contexts get created here.
946 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
947 this.rangeSelector_
= new DygraphRangeSelector(this);
950 // The interactive parts of the graph are drawn on top of the chart.
951 this.graphDiv
.appendChild(this.hidden_
);
952 this.graphDiv
.appendChild(this.canvas_
);
953 this.mouseEventElement_
= this.createMouseEventElement_();
955 // Create the grapher
956 this.layout_
= new DygraphLayout(this);
958 if (this.rangeSelector_
) {
959 // This needs to happen after the graph canvases are added to the div and the layout object is created.
960 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
965 this.mouseMoveHandler
= function(e
) {
966 dygraph
.mouseMove_(e
);
968 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
970 this.mouseOutHandler
= function(e
) {
971 dygraph
.mouseOut_(e
);
973 this.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
975 this.createDragInterface_();
977 this.resizeHandler
= function(e
) {
981 // Update when the window is resized.
982 // TODO(danvk): drop frames depending on complexity of the chart.
983 this.addEvent(window
, 'resize', this.resizeHandler
);
987 * Detach DOM elements in the dygraph and null out all data references.
988 * Calling this when you're done with a dygraph can dramatically reduce memory
989 * usage. See, e.g., the tests/perf.html example.
991 Dygraph
.prototype.destroy
= function() {
992 var removeRecursive
= function(node
) {
993 while (node
.hasChildNodes()) {
994 removeRecursive(node
.firstChild
);
995 node
.removeChild(node
.firstChild
);
999 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
1000 var reg
= this.registeredEvents_
[idx
];
1001 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
1003 this.registeredEvents_
= [];
1005 // remove mouse event handlers (This may not be necessary anymore)
1006 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
1007 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
1008 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
1009 removeRecursive(this.maindiv_
);
1011 var nullOut
= function(obj
) {
1012 for (var n
in obj
) {
1013 if (typeof(obj
[n
]) === 'object') {
1018 // remove event handlers
1019 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
1020 this.resizeHandler
= null;
1021 // These may not all be necessary, but it can't hurt...
1022 nullOut(this.layout_
);
1023 nullOut(this.plotter_
);
1028 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1029 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1030 * or the zoom rectangles) is done on this.canvas_.
1031 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1032 * @return {Object} The newly-created canvas
1035 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1036 var h
= Dygraph
.createCanvas();
1037 h
.style
.position
= "absolute";
1038 // TODO(danvk): h should be offset from canvas. canvas needs to include
1039 // some extra area to make it easier to zoom in on the far left and far
1040 // right. h needs to be precisely the plot area, so that clipping occurs.
1041 h
.style
.top
= canvas
.style
.top
;
1042 h
.style
.left
= canvas
.style
.left
;
1043 h
.width
= this.width_
;
1044 h
.height
= this.height_
;
1045 h
.style
.width
= this.width_
+ "px"; // for IE
1046 h
.style
.height
= this.height_
+ "px"; // for IE
1051 * Creates an overlay element used to handle mouse events.
1052 * @return {Object} The mouse event element.
1055 Dygraph
.prototype.createMouseEventElement_
= function() {
1056 if (this.isUsingExcanvas_
) {
1057 var elem
= document
.createElement("div");
1058 elem
.style
.position
= 'absolute';
1059 elem
.style
.backgroundColor
= 'white';
1060 elem
.style
.filter
= 'alpha(opacity=0)';
1061 elem
.style
.width
= this.width_
+ "px";
1062 elem
.style
.height
= this.height_
+ "px";
1063 this.graphDiv
.appendChild(elem
);
1066 return this.canvas_
;
1071 * Generate a set of distinct colors for the data series. This is done with a
1072 * color wheel. Saturation/Value are customizable, and the hue is
1073 * equally-spaced around the color wheel. If a custom set of colors is
1074 * specified, that is used instead.
1077 Dygraph
.prototype.setColors_
= function() {
1078 var labels
= this.getLabels();
1079 var num
= labels
.length
- 1;
1081 this.colorsMap_
= {};
1082 var colors
= this.attr_('colors');
1085 var sat
= this.attr_('colorSaturation') || 1.0;
1086 var val
= this.attr_('colorValue') || 0.5;
1087 var half
= Math
.ceil(num
/ 2);
1088 for (i
= 1; i
<= num
; i
++) {
1089 if (!this.visibility()[i
-1]) continue;
1090 // alternate colors for high contrast.
1091 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1092 var hue
= (1.0 * idx
/ (1 + num
));
1093 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1094 this.colors_
.push(colorStr
);
1095 this.colorsMap_
[labels
[i
]] = colorStr
;
1098 for (i
= 0; i
< num
; i
++) {
1099 if (!this.visibility()[i
]) continue;
1100 var colorStr
= colors
[i
% colors
.length
];
1101 this.colors_
.push(colorStr
);
1102 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1108 * Return the list of colors. This is either the list of colors passed in the
1109 * attributes or the autogenerated list of rgb(r,g,b) strings.
1110 * This does not return colors for invisible series.
1111 * @return {Array<string>} The list of colors.
1113 Dygraph
.prototype.getColors
= function() {
1114 return this.colors_
;
1118 * Returns a few attributes of a series, i.e. its color, its visibility, which
1119 * axis it's assigned to, and its column in the original data.
1120 * Returns null if the series does not exist.
1121 * Otherwise, returns an object with column, visibility, color and axis properties.
1122 * The "axis" property will be set to 1 for y1 and 2 for y2.
1123 * The "column" property can be fed back into getValue(row, column) to get
1124 * values for this series.
1126 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1128 var labels
= this.getLabels();
1129 for (var i
= 1; i
< labels
.length
; i
++) {
1130 if (labels
[i
] == series_name
) {
1135 if (idx
== -1) return null;
1140 visible
: this.visibility()[idx
- 1],
1141 color
: this.colorsMap_
[series_name
],
1142 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1147 * Create the text box to adjust the averaging period
1150 Dygraph
.prototype.createRollInterface_
= function() {
1151 // Create a roller if one doesn't exist already.
1152 if (!this.roller_
) {
1153 this.roller_
= document
.createElement("input");
1154 this.roller_
.type
= "text";
1155 this.roller_
.style
.display
= "none";
1156 this.graphDiv
.appendChild(this.roller_
);
1159 var display
= this.attr_('showRoller') ? 'block' : 'none';
1161 var area
= this.plotter_
.area
;
1162 var textAttr
= { "position": "absolute",
1164 "top": (area
.y
+ area
.h
- 25) + "px",
1165 "left": (area
.x
+ 1) + "px",
1168 this.roller_
.size
= "2";
1169 this.roller_
.value
= this.rollPeriod_
;
1170 for (var name
in textAttr
) {
1171 if (textAttr
.hasOwnProperty(name
)) {
1172 this.roller_
.style
[name
] = textAttr
[name
];
1177 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1182 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1183 * canvas (i.e. DOM Coords).
1185 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1186 return Dygraph
.pageX(e
) - context
.px
;
1191 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1192 * canvas (i.e. DOM Coords).
1194 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1195 return Dygraph
.pageY(e
) - context
.py
;
1199 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1203 Dygraph
.prototype.createDragInterface_
= function() {
1205 // Tracks whether the mouse is down right now
1207 isPanning
: false, // is this drag part of a pan?
1208 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1209 dragStartX
: null, // pixel coordinates
1210 dragStartY
: null, // pixel coordinates
1211 dragEndX
: null, // pixel coordinates
1212 dragEndY
: null, // pixel coordinates
1213 dragDirection
: null,
1214 prevEndX
: null, // pixel coordinates
1215 prevEndY
: null, // pixel coordinates
1216 prevDragDirection
: null,
1217 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1219 // The value on the left side of the graph when a pan operation starts.
1220 initialLeftmostDate
: null,
1222 // The number of units each pixel spans. (This won't be valid for log
1224 xUnitsPerPixel
: null,
1226 // TODO(danvk): update this comment
1227 // The range in second/value units that the viewport encompasses during a
1228 // panning operation.
1231 // Top-left corner of the canvas, in DOM coords
1232 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1236 // Values for use with panEdgeFraction, which limit how far outside the
1237 // graph's data boundaries it can be panned.
1238 boundedDates
: null, // [minDate, maxDate]
1239 boundedValues
: null, // [[minValue, maxValue] ...]
1241 // We cover iframes during mouse interactions. See comments in
1242 // dygraph-utils.js for more info on why this is a good idea.
1243 tarp
: new Dygraph
.IFrameTarp(),
1245 // contextB is the same thing as this context object but renamed.
1246 initializeMouseDown
: function(event
, g
, contextB
) {
1247 // prevents mouse drags from selecting page text.
1248 if (event
.preventDefault
) {
1249 event
.preventDefault(); // Firefox, Chrome, etc.
1251 event
.returnValue
= false; // IE
1252 event
.cancelBubble
= true;
1255 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1256 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1257 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1258 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1259 contextB
.cancelNextDblclick
= false;
1260 contextB
.tarp
.cover();
1264 var interactionModel
= this.attr_("interactionModel");
1266 // Self is the graph.
1269 // Function that binds the graph and context to the handler.
1270 var bindHandler
= function(handler
) {
1271 return function(event
) {
1272 handler(event
, self
, context
);
1276 for (var eventName
in interactionModel
) {
1277 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1278 this.addEvent(this.mouseEventElement_
, eventName
,
1279 bindHandler(interactionModel
[eventName
]));
1282 // If the user releases the mouse button during a drag, but not over the
1283 // canvas, then it doesn't count as a zooming action.
1284 this.mouseUpHandler_
= function(event
) {
1285 if (context
.isZooming
|| context
.isPanning
) {
1286 context
.isZooming
= false;
1287 context
.dragStartX
= null;
1288 context
.dragStartY
= null;
1291 if (context
.isPanning
) {
1292 context
.isPanning
= false;
1293 context
.draggingDate
= null;
1294 context
.dateRange
= null;
1295 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1296 delete self
.axes_
[i
].draggingValue
;
1297 delete self
.axes_
[i
].dragValueRange
;
1301 context
.tarp
.uncover();
1304 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1308 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1309 * up any previous zoom rectangles that were drawn. This could be optimized to
1310 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1313 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1314 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1315 * @param {Number} startX The X position where the drag started, in canvas
1317 * @param {Number} endX The current X position of the drag, in canvas coords.
1318 * @param {Number} startY The Y position where the drag started, in canvas
1320 * @param {Number} endY The current Y position of the drag, in canvas coords.
1321 * @param {Number} prevDirection the value of direction on the previous call to
1322 * this function. Used to avoid excess redrawing
1323 * @param {Number} prevEndX The value of endX on the previous call to this
1324 * function. Used to avoid excess redrawing
1325 * @param {Number} prevEndY The value of endY on the previous call to this
1326 * function. Used to avoid excess redrawing
1329 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1330 endY
, prevDirection
, prevEndX
,
1332 var ctx
= this.canvas_ctx_
;
1334 // Clean up from the previous rect if necessary
1335 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1336 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1337 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1338 } else if (prevDirection
== Dygraph
.VERTICAL
){
1339 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1340 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1343 // Draw a light-grey rectangle to show the new viewing area
1344 if (direction
== Dygraph
.HORIZONTAL
) {
1345 if (endX
&& startX
) {
1346 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1347 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1348 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1350 } else if (direction
== Dygraph
.VERTICAL
) {
1351 if (endY
&& startY
) {
1352 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1353 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1354 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1358 if (this.isUsingExcanvas_
) {
1359 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1364 * Clear the zoom rectangle (and perform no zoom).
1367 Dygraph
.prototype.clearZoomRect_
= function() {
1368 this.currentZoomRectArgs_
= null;
1369 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1373 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1374 * the canvas. The exact zoom window may be slightly larger if there are no data
1375 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1376 * which accepts dates that match the raw data. This function redraws the graph.
1378 * @param {Number} lowX The leftmost pixel value that should be visible.
1379 * @param {Number} highX The rightmost pixel value that should be visible.
1382 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1383 this.currentZoomRectArgs_
= null;
1384 // Find the earliest and latest dates contained in this canvasx range.
1385 // Convert the call to date ranges of the raw data.
1386 var minDate
= this.toDataXCoord(lowX
);
1387 var maxDate
= this.toDataXCoord(highX
);
1388 this.doZoomXDates_(minDate
, maxDate
);
1392 * Transition function to use in animations. Returns values between 0.0
1393 * (totally old values) and 1.0 (totally new values) for each frame.
1396 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1398 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1402 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1403 * method with doZoomX which accepts pixel coordinates. This function redraws
1406 * @param {Number} minDate The minimum date that should be visible.
1407 * @param {Number} maxDate The maximum date that should be visible.
1410 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1411 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1412 // can produce strange effects. Rather than the y-axis transitioning slowly
1413 // between values, it can jerk around.)
1414 var old_window
= this.xAxisRange();
1415 var new_window
= [minDate
, maxDate
];
1416 this.zoomed_x_
= true;
1418 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1419 if (that
.attr_("zoomCallback")) {
1420 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1426 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1427 * the canvas. This function redraws the graph.
1429 * @param {Number} lowY The topmost pixel value that should be visible.
1430 * @param {Number} highY The lowest pixel value that should be visible.
1433 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1434 this.currentZoomRectArgs_
= null;
1435 // Find the highest and lowest values in pixel range for each axis.
1436 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1437 // This is because pixels increase as you go down on the screen, whereas data
1438 // coordinates increase as you go up the screen.
1439 var oldValueRanges
= this.yAxisRanges();
1440 var newValueRanges
= [];
1441 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1442 var hi
= this.toDataYCoord(lowY
, i
);
1443 var low
= this.toDataYCoord(highY
, i
);
1444 newValueRanges
.push([low
, hi
]);
1447 this.zoomed_y_
= true;
1449 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1450 if (that
.attr_("zoomCallback")) {
1451 var xRange
= that
.xAxisRange();
1452 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1458 * Reset the zoom to the original view coordinates. This is the same as
1459 * double-clicking on the graph.
1463 Dygraph
.prototype.doUnzoom_
= function() {
1464 var dirty
= false, dirtyX
= false, dirtyY
= false;
1465 if (this.dateWindow_
!== null) {
1470 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1471 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1477 // Clear any selection, since it's likely to be drawn in the wrong place.
1478 this.clearSelection();
1481 this.zoomed_x_
= false;
1482 this.zoomed_y_
= false;
1484 var minDate
= this.rawData_
[0][0];
1485 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1487 // With only one frame, don't bother calculating extreme ranges.
1488 // TODO(danvk): merge this block w/ the code below
.
1489 if (!this.attr_("animatedZooms")) {
1490 this.dateWindow_
= null;
1491 for (i
= 0; i
< this.axes_
.length
; i
++) {
1492 if (this.axes_
[i
].valueWindow
!== null) {
1493 delete this.axes_
[i
].valueWindow
;
1497 if (this.attr_("zoomCallback")) {
1498 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1503 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1505 oldWindow
= this.xAxisRange();
1506 newWindow
= [minDate
, maxDate
];
1510 oldValueRanges
= this.yAxisRanges();
1511 // TODO(danvk): this is pretty inefficient
1512 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1513 var extremes
= packed
[1];
1515 // this has the side-effect of modifying this.axes_.
1516 // this doesn't make much sense in this context, but it's convenient (we
1517 // need this.axes_[*].extremeValues) and not harmful since we'll be
1518 // calling drawGraph_ shortly, which clobbers these values.
1519 this.computeYAxisRanges_(extremes
);
1521 newValueRanges
= [];
1522 for (i
= 0; i
< this.axes_
.length
; i
++) {
1523 var axis
= this.axes_
[i
];
1524 newValueRanges
.push((axis
.valueRange
!== null &&
1525 axis
.valueRange
!== undefined
) ?
1526 axis
.valueRange
: axis
.extremeRange
);
1531 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1533 that
.dateWindow_
= null;
1534 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1535 if (that
.axes_
[i
].valueWindow
!== null) {
1536 delete that
.axes_
[i
].valueWindow
;
1539 if (that
.attr_("zoomCallback")) {
1540 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1547 * Combined animation logic for all zoom functions.
1548 * either the x parameters or y parameters may be null.
1551 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1552 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1555 var valueRanges
= [];
1558 if (oldXRange
!== null && newXRange
!== null) {
1559 for (step
= 1; step
<= steps
; step
++) {
1560 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1561 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1562 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1566 if (oldYRanges
!== null && newYRanges
!== null) {
1567 for (step
= 1; step
<= steps
; step
++) {
1568 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1570 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1571 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1572 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1574 valueRanges
[step
-1] = thisRange
;
1579 Dygraph
.repeatAndCleanup(function(step
) {
1580 if (valueRanges
.length
) {
1581 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1582 var w
= valueRanges
[step
][i
];
1583 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1586 if (windows
.length
) {
1587 that
.dateWindow_
= windows
[step
];
1590 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1594 * Get the current graph's area object.
1596 * Returns: {x, y, w, h}
1598 Dygraph
.prototype.getArea
= function() {
1599 return this.plotter_
.area
;
1603 * Convert a mouse event to DOM coordinates relative to the graph origin.
1605 * Returns a two-element array: [X, Y].
1607 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1608 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1609 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1610 return [canvasx
, canvasy
];
1614 * Given a canvas X coordinate, find the closest row.
1615 * @param {Number} domX graph-relative DOM X coordinate
1616 * Returns: row number, integer
1619 Dygraph
.prototype.findClosestRow
= function(domX
) {
1620 var minDistX
= Infinity
;
1621 var pointIdx
= -1, setIdx
= -1;
1622 var sets
= this.layout_
.points
;
1623 for (var i
= 0; i
< sets
.length
; i
++) {
1624 var points
= sets
[i
];
1625 var len
= points
.length
;
1626 for (var j
= 0; j
< len
; j
++) {
1627 var point
= points
[j
];
1628 if (!Dygraph
.isValidPoint(point
, true)) continue;
1629 var dist
= Math
.abs(point
.canvasx
- domX
);
1630 if (dist
< minDistX
) {
1638 // TODO(danvk): remove this function; it's trivial and has only one use.
1639 return this.idxToRow_(setIdx
, pointIdx
);
1643 * Given canvas X,Y coordinates, find the closest point.
1645 * This finds the individual data point across all visible series
1646 * that's closest to the supplied DOM coordinates using the standard
1647 * Euclidean X,Y distance.
1649 * @param {Number} domX graph-relative DOM X coordinate
1650 * @param {Number} domY graph-relative DOM Y coordinate
1651 * Returns: {row, seriesName, point}
1654 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1655 var minDist
= Infinity
;
1657 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1658 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1659 var points
= this.layout_
.points
[setIdx
];
1660 for (var i
= 0; i
< points
.length
; ++i
) {
1661 var point
= points
[i
];
1662 if (!Dygraph
.isValidPoint(point
)) continue;
1663 dx
= point
.canvasx
- domX
;
1664 dy
= point
.canvasy
- domY
;
1665 dist
= dx
* dx
+ dy
* dy
;
1666 if (dist
< minDist
) {
1668 closestPoint
= point
;
1669 closestSeries
= setIdx
;
1674 var name
= this.layout_
.setNames
[closestSeries
];
1676 row
: idx
+ this.getLeftBoundary_(),
1683 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1685 * This first finds the X data point closest to the supplied DOM X coordinate,
1686 * then finds the series which puts the Y coordinate on top of its filled area,
1687 * using linear interpolation between adjacent point pairs.
1689 * @param {Number} domX graph-relative DOM X coordinate
1690 * @param {Number} domY graph-relative DOM Y coordinate
1691 * Returns: {row, seriesName, point}
1694 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1695 var row
= this.findClosestRow(domX
);
1696 var boundary
= this.getLeftBoundary_();
1697 var rowIdx
= row
- boundary
;
1698 var sets
= this.layout_
.points
;
1699 var closestPoint
, closestSeries
;
1700 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1701 var points
= this.layout_
.points
[setIdx
];
1702 if (rowIdx
>= points
.length
) continue;
1703 var p1
= points
[rowIdx
];
1704 if (!Dygraph
.isValidPoint(p1
)) continue;
1705 var py
= p1
.canvasy
;
1706 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1707 // interpolate series Y value using next point
1708 var p2
= points
[rowIdx
+ 1];
1709 if (Dygraph
.isValidPoint(p2
)) {
1710 var dx
= p2
.canvasx
- p1
.canvasx
;
1712 var r
= (domX
- p1
.canvasx
) / dx
;
1713 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1716 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1717 // interpolate series Y value using previous point
1718 var p0
= points
[rowIdx
- 1];
1719 if (Dygraph
.isValidPoint(p0
)) {
1720 var dx
= p1
.canvasx
- p0
.canvasx
;
1722 var r
= (p1
.canvasx
- domX
) / dx
;
1723 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1727 // Stop if the point (domX, py) is above this series' upper edge
1728 if (setIdx
=== 0 || py
< domY
) {
1730 closestSeries
= setIdx
;
1733 var name
= this.layout_
.setNames
[closestSeries
];
1742 * When the mouse moves in the canvas, display information about a nearby data
1743 * point and draw dots over those points in the data series. This function
1744 * takes care of cleanup of previously-drawn dots.
1745 * @param {Object} event The mousemove event from the browser.
1748 Dygraph
.prototype.mouseMove_
= function(event
) {
1749 // This prevents JS errors when mousing over the canvas before data loads.
1750 var points
= this.layout_
.points
;
1751 if (points
=== undefined
|| points
=== null) return;
1753 var canvasCoords
= this.eventToDomCoords(event
);
1754 var canvasx
= canvasCoords
[0];
1755 var canvasy
= canvasCoords
[1];
1757 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1758 var selectionChanged
= false;
1759 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1761 if (this.attr_("stackedGraph")) {
1762 closest
= this.findStackedPoint(canvasx
, canvasy
);
1764 closest
= this.findClosestPoint(canvasx
, canvasy
);
1766 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1768 var idx
= this.findClosestRow(canvasx
);
1769 selectionChanged
= this.setSelection(idx
);
1772 var callback
= this.attr_("highlightCallback");
1773 if (callback
&& selectionChanged
) {
1774 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1779 * Fetch left offset from first defined boundaryIds record (see bug #236).
1782 Dygraph
.prototype.getLeftBoundary_
= function() {
1783 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1784 if (this.boundaryIds_
[i
] !== undefined
) {
1785 return this.boundaryIds_
[i
][0];
1792 * Transforms layout_.points index into data row number.
1793 * @param int layout_.points index
1794 * @return int row number, or -1 if none could be found.
1797 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1798 if (rowIdx
< 0) return -1;
1800 var boundary
= this.getLeftBoundary_();
1801 return boundary
+ rowIdx
;
1802 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1803 // var set = this.layout_.datasets[setIdx];
1804 // if (idx < set.length) {
1805 // return boundary + idx;
1807 // idx -= set.length;
1812 Dygraph
.prototype.animateSelection_
= function(direction
) {
1813 var totalSteps
= 10;
1815 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1816 if (this.animateId
=== undefined
) this.animateId
= 0;
1817 var start
= this.fadeLevel
;
1818 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1820 if (this.fadeLevel
) {
1821 this.updateSelection_(1.0);
1826 var thisId
= ++this.animateId
;
1828 Dygraph
.repeatAndCleanup(
1830 // ignore simultaneous animations
1831 if (that
.animateId
!= thisId
) return;
1833 that
.fadeLevel
+= direction
;
1834 if (that
.fadeLevel
=== 0) {
1835 that
.clearSelection();
1837 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1840 steps
, millis
, function() {});
1844 * Draw dots over the selectied points in the data series. This function
1845 * takes care of cleanup of previously-drawn dots.
1848 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1849 var defaultPrevented
= this.cascadeEvents_('select', {
1850 selectedX
: this.lastx_
,
1851 selectedPoints
: this.selPoints_
1853 // TODO(danvk): use defaultPrevented here?
1855 // Clear the previously drawn vertical, if there is one
1857 var ctx
= this.canvas_ctx_
;
1858 if (this.attr_('highlightSeriesOpts')) {
1859 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1860 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1862 // Activating background fade includes an animation effect for a gradual
1863 // fade. TODO(klausw): make this independently configurable if it causes
1864 // issues? Use a shared preference to control animations?
1865 var animateBackgroundFade
= true;
1866 if (animateBackgroundFade
) {
1867 if (opt_animFraction
=== undefined
) {
1868 // start a new animation
1869 this.animateSelection_(1);
1872 alpha
*= opt_animFraction
;
1874 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1875 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1878 // Redraw only the highlighted series in the interactive canvas (not the
1879 // static plot canvas, which is where series are usually drawn).
1880 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1881 } else if (this.previousVerticalX_
>= 0) {
1882 // Determine the maximum highlight circle size.
1883 var maxCircleSize
= 0;
1884 var labels
= this.attr_('labels');
1885 for (i
= 1; i
< labels
.length
; i
++) {
1886 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1887 if (r
> maxCircleSize
) maxCircleSize
= r
;
1889 var px
= this.previousVerticalX_
;
1890 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1891 2 * maxCircleSize
+ 2, this.height_
);
1894 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1895 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1898 if (this.selPoints_
.length
> 0) {
1899 // Draw colored circles over the center of each selected point
1900 var canvasx
= this.selPoints_
[0].canvasx
;
1902 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1903 var pt
= this.selPoints_
[i
];
1904 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1906 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1907 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1908 var color
= this.plotter_
.colors
[pt
.name
];
1910 callback
= Dygraph
.Circles
.DEFAULT
;
1912 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1913 ctx
.strokeStyle
= color
;
1914 ctx
.fillStyle
= color
;
1915 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1920 this.previousVerticalX_
= canvasx
;
1925 * Manually set the selected points and display information about them in the
1926 * legend. The selection can be cleared using clearSelection() and queried
1927 * using getSelection().
1928 * @param { Integer } row number that should be highlighted (i.e. appear with
1929 * hover dots on the chart). Set to false to clear any selection.
1930 * @param { seriesName } optional series name to highlight that series with the
1931 * the highlightSeriesOpts setting.
1932 * @param { locked } optional If true, keep seriesName selected when mousing
1933 * over the graph, disabling closest-series highlighting. Call clearSelection()
1936 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1937 // Extract the points we've selected
1938 this.selPoints_
= [];
1940 if (row
!== false) {
1941 row
-= this.getLeftBoundary_();
1944 var changed
= false;
1945 if (row
!== false && row
>= 0) {
1946 if (row
!= this.lastRow_
) changed
= true;
1947 this.lastRow_
= row
;
1948 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1949 var set
= this.layout_
.datasets
[setIdx
];
1950 if (row
< set
.length
) {
1951 var point
= this.layout_
.points
[setIdx
][row
];
1953 if (this.attr_("stackedGraph")) {
1954 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1957 if (point
.yval
!== null) this.selPoints_
.push(point
);
1961 if (this.lastRow_
>= 0) changed
= true;
1965 if (this.selPoints_
.length
) {
1966 this.lastx_
= this.selPoints_
[0].xval
;
1971 if (opt_seriesName
!== undefined
) {
1972 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1973 this.highlightSet_
= opt_seriesName
;
1976 if (opt_locked
!== undefined
) {
1977 this.lockedSet_
= opt_locked
;
1981 this.updateSelection_(undefined
);
1987 * The mouse has left the canvas. Clear out whatever artifacts remain
1988 * @param {Object} event the mouseout event from the browser.
1991 Dygraph
.prototype.mouseOut_
= function(event
) {
1992 if (this.attr_("unhighlightCallback")) {
1993 this.attr_("unhighlightCallback")(event
);
1996 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
1997 this.clearSelection();
2002 * Clears the current selection (i.e. points that were highlighted by moving
2003 * the mouse over the chart).
2005 Dygraph
.prototype.clearSelection
= function() {
2006 this.cascadeEvents_('deselect', {});
2008 this.lockedSet_
= false;
2009 // Get rid of the overlay data
2010 if (this.fadeLevel
) {
2011 this.animateSelection_(-1);
2014 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2016 this.selPoints_
= [];
2019 this.highlightSet_
= null;
2023 * Returns the number of the currently selected row. To get data for this row,
2024 * you can use the getValue method.
2025 * @return { Integer } row number, or -1 if nothing is selected
2027 Dygraph
.prototype.getSelection
= function() {
2028 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2032 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2033 var points
= this.layout_
.points
[setIdx
];
2034 for (var row
= 0; row
< points
.length
; row
++) {
2035 if (points
[row
].x
== this.selPoints_
[0].x
) {
2036 return row
+ this.getLeftBoundary_();
2044 * Returns the name of the currently-highlighted series.
2045 * Only available when the highlightSeriesOpts option is in use.
2047 Dygraph
.prototype.getHighlightSeries
= function() {
2048 return this.highlightSet_
;
2052 * Returns true if the currently-highlighted series was locked
2053 * via setSelection(..., seriesName, true).
2055 Dygraph
.prototype.isSeriesLocked
= function() {
2056 return this.lockedSet_
;
2060 * Fires when there's data available to be graphed.
2061 * @param {String} data Raw CSV data to be plotted
2064 Dygraph
.prototype.loadedEvent_
= function(data
) {
2065 this.rawData_
= this.parseCSV_(data
);
2070 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2073 Dygraph
.prototype.addXTicks_
= function() {
2074 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2076 if (this.dateWindow_
) {
2077 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2079 range
= this.fullXRange_();
2082 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2083 var xTicks
= xAxisOptionsView('ticker')(
2086 this.width_
, // TODO(danvk): should be area.width
2089 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2090 // console.log(msg);
2091 this.layout_
.setXTicks(xTicks
);
2096 * Computes the range of the data series (including confidence intervals).
2097 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2098 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2099 * @return [low, high]
2101 Dygraph
.prototype.extremeValues_
= function(series
) {
2102 var minY
= null, maxY
= null, j
, y
;
2104 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2106 // With custom bars, maxY is the max of the high values.
2107 for (j
= 0; j
< series
.length
; j
++) {
2108 y
= series
[j
][1][0];
2109 if (y
=== null || isNaN(y
)) continue;
2110 var low
= y
- series
[j
][1][1];
2111 var high
= y
+ series
[j
][1][2];
2112 if (low
> y
) low
= y
; // this can happen with custom bars,
2113 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2114 if (maxY
=== null || high
> maxY
) {
2117 if (minY
=== null || low
< minY
) {
2122 for (j
= 0; j
< series
.length
; j
++) {
2124 if (y
=== null || isNaN(y
)) continue;
2125 if (maxY
=== null || y
> maxY
) {
2128 if (minY
=== null || y
< minY
) {
2134 return [minY
, maxY
];
2139 * This function is called once when the chart's data is changed or the options
2140 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2141 * idea is that values derived from the chart's data can be computed here,
2142 * rather than every time the chart is drawn. This includes things like the
2143 * number of axes, rolling averages, etc.
2145 Dygraph
.prototype.predraw_
= function() {
2146 var start
= new Date();
2148 // TODO(danvk): move more computations out of drawGraph_ and into here.
2149 this.computeYAxes_();
2151 // Create a new plotter.
2152 if (this.plotter_
) {
2153 this.cascadeEvents_('clearChart');
2154 this.plotter_
.clear();
2156 this.plotter_
= new DygraphCanvasRenderer(this,
2161 // The roller sits in the bottom left corner of the chart. We don't know where
2162 // this will be until the options are available, so it's positioned here.
2163 this.createRollInterface_();
2165 this.cascadeEvents_('predraw');
2167 if (this.rangeSelector_
) {
2168 this.rangeSelector_
.renderStaticLayer();
2171 // Convert the raw data (a 2D array) into the internal format and compute
2172 // rolling averages.
2173 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2174 for (var i
= 1; i
< this.numColumns(); i
++) {
2175 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2176 var logScale
= this.attr_('logscale');
2177 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2178 series
= this.rollingAverage(series
, this.rollPeriod_
);
2179 this.rolledSeries_
.push(series
);
2182 // If the data or options have changed, then we'd better redraw.
2185 // This is used to determine whether to do various animations.
2186 var end
= new Date();
2187 this.drawingTimeMs_
= (end
- start
);
2191 * Loop over all fields and create datasets, calculating extreme y-values for
2192 * each series and extreme x-indices as we go.
2194 * dateWindow is passed in as an explicit parameter so that we can compute
2195 * extreme values "speculatively", i.e. without actually setting state on the
2198 * TODO(danvk): make this more of a true function
2199 * @return [ datasets, seriesExtremes, boundaryIds ]
2202 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2203 var boundaryIds
= [];
2204 var cumulative_y
= []; // For stacked series.
2206 var extremes
= {}; // series name -> [low, high]
2209 // Loop over the fields (series). Go from the last to the first,
2210 // because if they're stacked that's how we accumulate the values.
2211 var num_series
= rolledSeries
.length
- 1;
2212 for (i
= num_series
; i
>= 1; i
--) {
2213 if (!this.visibility()[i
- 1]) continue;
2215 // Note: this copy _is_ necessary at the moment.
2216 // If you remove it, it breaks zooming with error bars on.
2217 // TODO(danvk): investigate further & write a test for this.
2219 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2220 series
.push(rolledSeries
[i
][j
]);
2223 // Prune down to the desired range, if necessary (for zooming)
2224 // Because there can be lines going to points outside of the visible area,
2225 // we actually prune to visible points, plus one on either side.
2226 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2228 var low
= dateWindow
[0];
2229 var high
= dateWindow
[1];
2231 // TODO(danvk): do binary search instead of linear search.
2232 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2233 var firstIdx
= null, lastIdx
= null;
2234 for (k
= 0; k
< series
.length
; k
++) {
2235 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2238 if (series
[k
][0] <= high
) {
2242 if (firstIdx
=== null) firstIdx
= 0;
2243 if (firstIdx
> 0) firstIdx
--;
2244 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2245 if (lastIdx
< series
.length
- 1) lastIdx
++;
2246 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2247 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2248 pruned
.push(series
[k
]);
2252 boundaryIds
[i
-1] = [0, series
.length
-1];
2255 var seriesExtremes
= this.extremeValues_(series
);
2258 for (j
=0; j
<series
.length
; j
++) {
2259 series
[j
] = [series
[j
][0],
2264 } else if (this.attr_("stackedGraph")) {
2265 var l
= series
.length
;
2267 for (j
= 0; j
< l
; j
++) {
2268 // If one data set has a NaN, let all subsequent stacked
2269 // sets inherit the NaN -- only start at 0 for the first set.
2270 var x
= series
[j
][0];
2271 if (cumulative_y
[x
] === undefined
) {
2272 cumulative_y
[x
] = 0;
2275 actual_y
= series
[j
][1];
2276 if (actual_y
=== null) {
2277 series
[j
] = [x
, null];
2281 cumulative_y
[x
] += actual_y
;
2283 series
[j
] = [x
, cumulative_y
[x
]];
2285 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2286 seriesExtremes
[1] = cumulative_y
[x
];
2288 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2289 seriesExtremes
[0] = cumulative_y
[x
];
2294 var seriesName
= this.attr_("labels")[i
];
2295 extremes
[seriesName
] = seriesExtremes
;
2296 datasets
[i
] = series
;
2299 // For stacked graphs, a NaN value for any point in the sum should create a
2300 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2301 if (this.attr_("stackedGraph")) {
2302 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2303 // Use the first nonempty dataset to get X values.
2304 if (!datasets
[k
]) continue;
2305 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2306 var x
= datasets
[k
][j
][0];
2307 if (isNaN(cumulative_y
[x
])) {
2308 // Set all Y values to NaN at that X value.
2309 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2310 if (!datasets
[i
]) continue;
2311 datasets
[i
][j
][1] = NaN
;
2319 return [ datasets
, extremes
, boundaryIds
];
2323 * Update the graph with new data. This method is called when the viewing area
2324 * has changed. If the underlying data or options have changed, predraw_ will
2325 * be called before drawGraph_ is called.
2329 Dygraph
.prototype.drawGraph_
= function() {
2330 var start
= new Date();
2332 // This is used to set the second parameter to drawCallback, below.
2333 var is_initial_draw
= this.is_initial_draw_
;
2334 this.is_initial_draw_
= false;
2336 this.layout_
.removeAllDatasets();
2338 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2340 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2341 var datasets
= packed
[0];
2342 var extremes
= packed
[1];
2343 this.boundaryIds_
= packed
[2];
2345 this.setIndexByName_
= {};
2346 var labels
= this.attr_("labels");
2347 if (labels
.length
> 0) {
2348 this.setIndexByName_
[labels
[0]] = 0;
2351 for (var i
= 1; i
< datasets
.length
; i
++) {
2352 this.setIndexByName_
[labels
[i
]] = i
;
2353 if (!this.visibility()[i
- 1]) continue;
2354 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2355 this.datasetIndex_
[i
] = dataIdx
++;
2358 this.computeYAxisRanges_(extremes
);
2359 this.layout_
.setYAxes(this.axes_
);
2363 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2364 var tmp_zoomed_x
= this.zoomed_x_
;
2365 // Tell PlotKit to use this new data and render itself
2366 this.layout_
.setDateWindow(this.dateWindow_
);
2367 this.zoomed_x_
= tmp_zoomed_x
;
2368 this.layout_
.evaluateWithError();
2369 this.renderGraph_(is_initial_draw
);
2371 if (this.attr_("timingName")) {
2372 var end
= new Date();
2374 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2380 * This does the work of drawing the chart. It assumes that the layout and axis
2381 * scales have already been set (e.g. by predraw_).
2385 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2386 this.cascadeEvents_('clearChart');
2387 this.plotter_
.clear();
2389 if (this.attr_('underlayCallback')) {
2390 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2391 // users who expect a deprecated form of this callback.
2392 this.attr_('underlayCallback')(
2393 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2397 canvas
: this.hidden_
,
2398 drawingContext
: this.hidden_ctx_
2400 this.cascadeEvents_('willDrawChart', e
);
2401 this.plotter_
.render();
2402 this.cascadeEvents_('didDrawChart', e
);
2404 // TODO(danvk): is this a performance bottleneck when panning?
2405 // The interaction canvas should already be empty in that situation.
2406 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2407 this.canvas_
.height
);
2409 // Generate a static legend before any particular point is selected.
2411 if (this.rangeSelector_
) {
2412 this.rangeSelector_
.renderInteractiveLayer();
2414 if (this.attr_("drawCallback") !== null) {
2415 this.attr_("drawCallback")(this, is_initial_draw
);
2421 * Determine properties of the y-axes which are independent of the data
2422 * currently being displayed. This includes things like the number of axes and
2423 * the style of the axes. It does not include the range of each axis and its
2425 * This fills in this.axes_.
2426 * axes_ = [ { options } ]
2427 * indices are into the axes_ array.
2429 Dygraph
.prototype.computeYAxes_
= function() {
2430 // Preserve valueWindow settings if they exist, and if the user hasn't
2431 // specified a new valueRange.
2432 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2433 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2435 for (index
= 0; index
< this.axes_
.length
; index
++) {
2436 valueWindows
.push(this.axes_
[index
].valueWindow
);
2440 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2441 // data computation as well as options storage.
2442 // Go through once and add all the axes.
2445 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2446 // Add a new axis, making a copy of its per-axis options.
2447 opts
= { g
: this };
2448 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2449 this.axes_
[axis
] = opts
;
2452 if (valueWindows
!== undefined
) {
2453 // Restore valueWindow settings.
2454 for (index
= 0; index
< valueWindows
.length
; index
++) {
2455 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2459 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2461 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2462 v
= opts("valueRange");
2463 if (v
) this.axes_
[axis
].valueRange
= v
;
2464 } else { // To keep old behavior
2465 var axes
= this.user_attrs_
.axes
;
2466 if (axes
&& axes
.y2
) {
2467 v
= axes
.y2
.valueRange
;
2468 if (v
) this.axes_
[axis
].valueRange
= v
;
2475 * Returns the number of y-axes on the chart.
2476 * @return {Number} the number of axes.
2478 Dygraph
.prototype.numAxes
= function() {
2479 return this.attributes_
.numAxes();
2484 * Returns axis properties for the given series.
2485 * @param { String } setName The name of the series for which to get axis
2486 * properties, e.g. 'Y1'.
2487 * @return { Object } The axis properties.
2489 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2490 // TODO(danvk): handle errors.
2491 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2496 * Determine the value range and tick marks for each axis.
2497 * @param {Object} extremes A mapping from seriesName -> [low, high]
2498 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2500 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2502 var numAxes
= this.attributes_
.numAxes();
2504 // Compute extreme values, a span and tick marks for each axis.
2505 for (var i
= 0; i
< numAxes
; i
++) {
2506 var axis
= this.axes_
[i
];
2508 series
= this.attributes_
.seriesForAxis(i
);
2510 if (series
.length
== 0) {
2511 // If no series are defined or visible then use a reasonable default
2512 axis
.extremeRange
= [0, 1];
2514 // Calculate the extremes of extremes.
2515 var minY
= Infinity
; // extremes[series[0]][0];
2516 var maxY
= -Infinity
; // extremes[series[0]][1];
2517 var extremeMinY
, extremeMaxY
;
2519 for (var j
= 0; j
< series
.length
; j
++) {
2520 // this skips invisible series
2521 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2523 // Only use valid extremes to stop null data series' from corrupting the scale.
2524 extremeMinY
= extremes
[series
[j
]][0];
2525 if (extremeMinY
!== null) {
2526 minY
= Math
.min(extremeMinY
, minY
);
2528 extremeMaxY
= extremes
[series
[j
]][1];
2529 if (extremeMaxY
!== null) {
2530 maxY
= Math
.max(extremeMaxY
, maxY
);
2533 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2535 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2536 if (minY
== Infinity
) minY
= 0;
2537 if (maxY
== -Infinity
) maxY
= 1;
2539 // Add some padding and round up to an integer to be human-friendly.
2540 var span
= maxY
- minY
;
2541 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2542 if (span
=== 0) { span
= maxY
; }
2544 var maxAxisY
, minAxisY
;
2545 if (axis
.logscale
) {
2546 maxAxisY
= maxY
+ 0.1 * span
;
2549 maxAxisY
= maxY
+ 0.1 * span
;
2550 minAxisY
= minY
- 0.1 * span
;
2552 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2553 if (!this.attr_("avoidMinZero")) {
2554 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2555 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2558 if (this.attr_("includeZero")) {
2559 if (maxY
< 0) maxAxisY
= 0;
2560 if (minY
> 0) minAxisY
= 0;
2563 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2565 if (axis
.valueWindow
) {
2566 // This is only set if the user has zoomed on the y-axis. It is never set
2567 // by a user. It takes precedence over axis.valueRange because, if you set
2568 // valueRange, you'd still expect to be able to pan.
2569 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2570 } else if (axis
.valueRange
) {
2571 // This is a user-set value range for this axis.
2572 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2574 axis
.computedValueRange
= axis
.extremeRange
;
2577 // Add ticks. By default, all axes inherit the tick positions of the
2578 // primary axis. However, if an axis is specifically marked as having
2579 // independent ticks, then that is permissible as well.
2580 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2581 var ticker
= opts('ticker');
2582 if (i
=== 0 || axis
.independentTicks
) {
2583 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2584 axis
.computedValueRange
[1],
2585 this.height_
, // TODO(danvk): should be area.height
2589 var p_axis
= this.axes_
[0];
2590 var p_ticks
= p_axis
.ticks
;
2591 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2592 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2593 var tick_values
= [];
2594 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2595 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2596 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2597 tick_values
.push(y_val
);
2600 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2601 axis
.computedValueRange
[1],
2602 this.height_
, // TODO(danvk): should be area.height
2611 * Extracts one series from the raw data (a 2D array) into an array of (date,
2614 * This is where undesirable points (i.e. negative values on log scales and
2615 * missing values through which we wish to connect lines) are dropped.
2616 * TODO(danvk): the "missing values" bit above doesn't seem right.
2620 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2621 // TODO(danvk): pre-allocate series here.
2623 for (var j
= 0; j
< rawData
.length
; j
++) {
2624 var x
= rawData
[j
][0];
2625 var point
= rawData
[j
][i
];
2627 // On the log scale, points less than zero do not exist.
2628 // This will create a gap in the chart.
2633 series
.push([x
, point
]);
2640 * Calculates the rolling average of a data set.
2641 * If originalData is [label, val], rolls the average of those.
2642 * If originalData is [label, [, it's interpreted as [value, stddev]
2643 * and the roll is returned in the same form, with appropriately reduced
2644 * stddev for each value.
2645 * Note that this is where fractional input (i.e. '5/10') is converted into
2647 * @param {Array} originalData The data in the appropriate format (see above)
2648 * @param {Number} rollPeriod The number of points over which to average the
2651 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2652 if (originalData
.length
< 2)
2653 return originalData
;
2654 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2655 var rollingData
= [];
2656 var sigma
= this.attr_("sigma");
2658 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2659 if (this.fractions_
) {
2661 var den
= 0; // numerator/denominator
2663 for (i
= 0; i
< originalData
.length
; i
++) {
2664 num
+= originalData
[i
][1][0];
2665 den
+= originalData
[i
][1][1];
2666 if (i
- rollPeriod
>= 0) {
2667 num
-= originalData
[i
- rollPeriod
][1][0];
2668 den
-= originalData
[i
- rollPeriod
][1][1];
2671 var date
= originalData
[i
][0];
2672 var value
= den
? num
/ den
: 0.0;
2673 if (this.attr_("errorBars")) {
2674 if (this.attr_("wilsonInterval")) {
2675 // For more details on this confidence interval, see:
2676 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2678 var p
= value
< 0 ? 0 : value
, n
= den
;
2679 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2680 var denom
= 1 + sigma
* sigma
/ den
;
2681 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2682 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2683 rollingData
[i
] = [date
,
2684 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2686 rollingData
[i
] = [date
, [0, 0, 0]];
2689 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2690 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2693 rollingData
[i
] = [date
, mult
* value
];
2696 } else if (this.attr_("customBars")) {
2701 for (i
= 0; i
< originalData
.length
; i
++) {
2702 var data
= originalData
[i
][1];
2704 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2706 if (y
!== null && !isNaN(y
)) {
2712 if (i
- rollPeriod
>= 0) {
2713 var prev
= originalData
[i
- rollPeriod
];
2714 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2722 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2723 1.0 * (mid
- low
) / count
,
2724 1.0 * (high
- mid
) / count
]];
2726 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2730 // Calculate the rolling average for the first rollPeriod - 1 points where
2731 // there is not enough data to roll over the full number of points
2732 if (!this.attr_("errorBars")){
2733 if (rollPeriod
== 1) {
2734 return originalData
;
2737 for (i
= 0; i
< originalData
.length
; i
++) {
2740 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2741 y
= originalData
[j
][1];
2742 if (y
=== null || isNaN(y
)) continue;
2744 sum
+= originalData
[j
][1];
2747 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2749 rollingData
[i
] = [originalData
[i
][0], null];
2754 for (i
= 0; i
< originalData
.length
; i
++) {
2758 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2759 y
= originalData
[j
][1][0];
2760 if (y
=== null || isNaN(y
)) continue;
2762 sum
+= originalData
[j
][1][0];
2763 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2766 stddev
= Math
.sqrt(variance
) / num_ok
;
2767 rollingData
[i
] = [originalData
[i
][0],
2768 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2770 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2780 * Detects the type of the str (date or numeric) and sets the various
2781 * formatting attributes in this.attrs_ based on this type.
2782 * @param {String} str An x value.
2785 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2787 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2788 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2789 str
.indexOf('/') >= 0 ||
2790 isNaN(parseFloat(str
))) {
2792 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2793 // TODO(danvk): remove support for this format.
2798 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2799 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2800 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2801 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2803 /** @private (shut up, jsdoc!) */
2804 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2805 // TODO(danvk): use Dygraph.numberValueFormatter here?
2806 /** @private (shut up, jsdoc!) */
2807 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2808 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2809 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2814 * Parses the value as a floating point number. This is like the parseFloat()
2815 * built-in, but with a few differences:
2816 * - the empty string is parsed as null, rather than NaN.
2817 * - if the string cannot be parsed at all, an error is logged.
2818 * If the string can't be parsed, this method returns null.
2819 * @param {String} x The string to be parsed
2820 * @param {Number} opt_line_no The line number from which the string comes.
2821 * @param {String} opt_line The text of the line from which the string comes.
2825 // Parse the x as a float or return null if it's not a number.
2826 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2827 var val
= parseFloat(x
);
2828 if (!isNaN(val
)) return val
;
2830 // Try to figure out what happeend.
2831 // If the value is the empty string, parse it as null.
2832 if (/^ *$/.test(x
)) return null;
2834 // If it was actually "NaN", return it as NaN.
2835 if (/^ *nan *$/i.test(x
)) return NaN
;
2837 // Looks like a parsing error.
2838 var msg
= "Unable to parse '" + x
+ "' as a number";
2839 if (opt_line
!== null && opt_line_no
!== null) {
2840 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2849 * Parses a string in a special csv format. We expect a csv file where each
2850 * line is a date point, and the first field in each line is the date string.
2851 * We also expect that all remaining fields represent series.
2852 * if the errorBars attribute is set, then interpret the fields as:
2853 * date, series1, stddev1, series2, stddev2, ...
2854 * @param {[Object]} data See above.
2856 * @return [Object] An array with one entry for each row. These entries
2857 * are an array of cells in that row. The first entry is the parsed x-value for
2858 * the row. The second, third, etc. are the y-values. These can take on one of
2859 * three forms, depending on the CSV and constructor parameters:
2861 * 2. [ value, stddev ]
2862 * 3. [ low value, center value, high value ]
2864 Dygraph
.prototype.parseCSV_
= function(data
) {
2866 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2867 var lines
= data
.split(line_delimiter
|| "\n");
2870 // Use the default delimiter or fall back to a tab if that makes sense.
2871 var delim
= this.attr_('delimiter');
2872 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2877 if (!('labels' in this.user_attrs_
)) {
2878 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2880 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2881 this.attributes_
.reparseSeries();
2886 var defaultParserSet
= false; // attempt to auto-detect x value type
2887 var expectedCols
= this.attr_("labels").length
;
2888 var outOfOrder
= false;
2889 for (var i
= start
; i
< lines
.length
; i
++) {
2890 var line
= lines
[i
];
2892 if (line
.length
=== 0) continue; // skip blank lines
2893 if (line
[0] == '#') continue; // skip comment lines
2894 var inFields
= line
.split(delim
);
2895 if (inFields
.length
< 2) continue;
2898 if (!defaultParserSet
) {
2899 this.detectTypeFromString_(inFields
[0]);
2900 xParser
= this.attr_("xValueParser");
2901 defaultParserSet
= true;
2903 fields
[0] = xParser(inFields
[0], this);
2905 // If fractions are expected, parse the numbers as "A/B
"
2906 if (this.fractions_) {
2907 for (j = 1; j < inFields.length; j++) {
2908 // TODO(danvk): figure out an appropriate way to flag parse errors.
2909 vals = inFields[j].split("/");
2910 if (vals.length != 2) {
2911 this.error('Expected fractional "num
/den
" values in CSV data ' +
2912 "but found a value
'" + inFields[j] + "' on line
" +
2913 (1 + i) + " ('" + line + "') which is not of
this form
.");
2916 fields[j] = [this.parseFloat_(vals[0], i, line),
2917 this.parseFloat_(vals[1], i, line)];
2920 } else if (this.attr_("errorBars
")) {
2921 // If there are error bars, values are (value, stddev) pairs
2922 if (inFields.length % 2 != 1) {
2923 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2924 'but line ' + (1 + i) + ' has an odd number of values (' +
2925 (inFields.length - 1) + "): '" + line + "'");
2927 for (j = 1; j < inFields.length; j += 2) {
2928 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2929 this.parseFloat_(inFields[j + 1], i, line)];
2931 } else if (this.attr_("customBars
")) {
2932 // Bars are a low;center;high tuple
2933 for (j = 1; j < inFields.length; j++) {
2934 var val = inFields[j];
2935 if (/^ *$/.test(val)) {
2936 fields[j] = [null, null, null];
2938 vals = val.split(";");
2939 if (vals.length == 3) {
2940 fields[j] = [ this.parseFloat_(vals[0], i, line),
2941 this.parseFloat_(vals[1], i, line),
2942 this.parseFloat_(vals[2], i, line) ];
2944 this.warn('When using customBars, values must be either blank ' +
2945 'or "low
;center
;high
" tuples (got "' + val +
2946 '" on line ' + (1+i));
2951 // Values are just numbers
2952 for (j = 1; j < inFields.length; j++) {
2953 fields[j] = this.parseFloat_(inFields[j], i, line);
2956 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2960 if (fields.length != expectedCols) {
2961 this.error("Number of columns
in line
" + i + " (" + fields.length +
2962 ") does not agree
with number of
labels (" + expectedCols +
2966 // If the user specified the 'labels' option and none of the cells of the
2967 // first row parsed correctly, then they probably double-specified the
2968 // labels. We go with the values set in the option, discard this row and
2969 // log a warning to the JS console.
2970 if (i === 0 && this.attr_('labels')) {
2971 var all_null = true;
2972 for (j = 0; all_null && j < fields.length; j++) {
2973 if (fields[j]) all_null = false;
2976 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2977 "CSV
data ('" + line + "') appears to also contain labels
. " +
2978 "Will drop the CSV labels and
use the option labels
.");
2986 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2987 ret.sort(function(a,b) { return a[0] - b[0]; });
2995 * The user has provided their data as a pre-packaged JS array. If the x values
2996 * are numeric, this is the same as dygraphs' internal format. If the x values
2997 * are dates, we need to convert them from Date objects to ms since epoch.
2998 * @param {[Object]} data
2999 * @return {[Object]} data with numeric x values.
3001 Dygraph.prototype.parseArray_ = function(data) {
3002 // Peek at the first x value to see if it's numeric.
3003 if (data.length === 0) {
3004 this.error("Can
't plot empty data set");
3007 if (data[0].length === 0) {
3008 this.error("Data set cannot contain an empty row");
3013 if (this.attr_("labels") === null) {
3014 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3015 "in the options parameter");
3016 this.attrs_.labels = [ "X" ];
3017 for (i = 1; i < data[0].length; i++) {
3018 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3020 this.attributes_.reparseSeries();
3022 var num_labels = this.attr_("labels");
3023 if (num_labels.length != data[0].length) {
3024 this.error("Mismatch between number of labels (" + num_labels +
3025 ") and number of columns in array (" + data[0].length + ")");
3030 if (Dygraph.isDateLike(data[0][0])) {
3031 // Some intelligent defaults for a date x-axis.
3032 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3033 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3034 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3036 // Assume they're all dates
.
3037 var parsedData
= Dygraph
.clone(data
);
3038 for (i
= 0; i
< data
.length
; i
++) {
3039 if (parsedData
[i
].length
=== 0) {
3040 this.error("Row " + (1 + i
) + " of data is empty");
3043 if (parsedData
[i
][0] === null ||
3044 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3045 isNaN(parsedData
[i
][0].getTime())) {
3046 this.error("x value in row " + (1 + i
) + " is not a Date");
3049 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3053 // Some intelligent defaults for a numeric x-axis.
3054 /** @private (shut up, jsdoc!) */
3055 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3056 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3057 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3063 * Parses a DataTable object from gviz.
3064 * The data is expected to have a first column that is either a date or a
3065 * number. All subsequent columns must be numbers. If there is a clear mismatch
3066 * between this.xValueParser_ and the type of the first column, it will be
3067 * fixed. Fills out rawData_.
3068 * @param {[Object]} data See above.
3071 Dygraph
.prototype.parseDataTable_
= function(data
) {
3072 var shortTextForAnnotationNum
= function(num
) {
3073 // converts [0-9]+ [A-Z][a-z]*
3074 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3075 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3076 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3077 num
= Math
.floor(num
/ 26);
3079 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3080 num
= Math
.floor((num
- 1) / 26);
3085 var cols
= data
.getNumberOfColumns();
3086 var rows
= data
.getNumberOfRows();
3088 var indepType
= data
.getColumnType(0);
3089 if (indepType
== 'date' || indepType
== 'datetime') {
3090 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3091 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3092 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3093 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3094 } else if (indepType
== 'number') {
3095 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3096 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3097 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3098 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3100 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3101 "column 1 of DataTable input (Got '" + indepType
+ "')");
3105 // Array of the column indices which contain data (and not annotations).
3107 var annotationCols
= {}; // data index -> [annotation cols]
3108 var hasAnnotations
= false;
3110 for (i
= 1; i
< cols
; i
++) {
3111 var type
= data
.getColumnType(i
);
3112 if (type
== 'number') {
3114 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3115 // This is OK -- it's an annotation column.
3116 var dataIdx
= colIdx
[colIdx
.length
- 1];
3117 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3118 annotationCols
[dataIdx
] = [i
];
3120 annotationCols
[dataIdx
].push(i
);
3122 hasAnnotations
= true;
3124 this.error("Only 'number' is supported as a dependent type with Gviz." +
3125 " 'string' is only supported if displayAnnotations is true");
3129 // Read column labels
3130 // TODO(danvk): add support back for errorBars
3131 var labels
= [data
.getColumnLabel(0)];
3132 for (i
= 0; i
< colIdx
.length
; i
++) {
3133 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3134 if (this.attr_("errorBars")) i
+= 1;
3136 this.attrs_
.labels
= labels
;
3137 cols
= labels
.length
;
3140 var outOfOrder
= false;
3141 var annotations
= [];
3142 for (i
= 0; i
< rows
; i
++) {
3144 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3145 data
.getValue(i
, 0) === null) {
3146 this.warn("Ignoring row " + i
+
3147 " of DataTable because of undefined or null first column.");
3151 if (indepType
== 'date' || indepType
== 'datetime') {
3152 row
.push(data
.getValue(i
, 0).getTime());
3154 row
.push(data
.getValue(i
, 0));
3156 if (!this.attr_("errorBars")) {
3157 for (j
= 0; j
< colIdx
.length
; j
++) {
3158 var col
= colIdx
[j
];
3159 row
.push(data
.getValue(i
, col
));
3160 if (hasAnnotations
&&
3161 annotationCols
.hasOwnProperty(col
) &&
3162 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3164 ann
.series
= data
.getColumnLabel(col
);
3166 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3168 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3169 if (k
) ann
.text
+= "\n";
3170 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3172 annotations
.push(ann
);
3176 // Strip out infinities, which give dygraphs problems later on.
3177 for (j
= 0; j
< row
.length
; j
++) {
3178 if (!isFinite(row
[j
])) row
[j
] = null;
3181 for (j
= 0; j
< cols
- 1; j
++) {
3182 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3185 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3192 this.warn("DataTable is out of order; order it correctly to speed loading.");
3193 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3195 this.rawData_
= ret
;
3197 if (annotations
.length
> 0) {
3198 this.setAnnotations(annotations
, true);
3203 * Get the CSV data. If it's in a function, call that function. If it's in a
3204 * file, do an XMLHttpRequest to get it.
3207 Dygraph
.prototype.start_
= function() {
3208 var data
= this.file_
;
3210 // Functions can return references of all other types.
3211 if (typeof data
== 'function') {
3215 if (Dygraph
.isArrayLike(data
)) {
3216 this.rawData_
= this.parseArray_(data
);
3218 } else if (typeof data
== 'object' &&
3219 typeof data
.getColumnRange
== 'function') {
3220 // must be a DataTable from gviz.
3221 this.parseDataTable_(data
);
3223 } else if (typeof data
== 'string') {
3224 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3225 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3226 if (line_delimiter
) {
3227 this.loadedEvent_(data
);
3229 var req
= new XMLHttpRequest();
3231 req
.onreadystatechange
= function () {
3232 if (req
.readyState
== 4) {
3233 if (req
.status
=== 200 || // Normal http
3234 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3235 caller
.loadedEvent_(req
.responseText
);
3240 req
.open("GET", data
, true);
3244 this.error("Unknown data format: " + (typeof data
));
3249 * Changes various properties of the graph. These can include:
3251 * <li>file: changes the source data for the graph</li>
3252 * <li>errorBars: changes whether the data contains stddev</li>
3255 * There's a huge variety of options that can be passed to this method. For a
3256 * full list, see http://dygraphs.com/options.html.
3258 * @param {Object} attrs The new properties and values
3259 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3260 * call to updateOptions(). If you know better, you can pass true to explicitly
3261 * block the redraw. This can be useful for chaining updateOptions() calls,
3262 * avoiding the occasional infinite loop and preventing redraws when it's not
3263 * necessary (e.g. when updating a callback).
3265 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3266 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3268 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3269 var file
= input_attrs
.file
;
3270 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3272 // TODO(danvk): this is a mess. Move these options into attr_.
3273 if ('rollPeriod' in attrs
) {
3274 this.rollPeriod_
= attrs
.rollPeriod
;
3276 if ('dateWindow' in attrs
) {
3277 this.dateWindow_
= attrs
.dateWindow
;
3278 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3279 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3282 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3283 this.zoomed_y_
= (attrs
.valueRange
!== null);
3286 // TODO(danvk): validate per-series options.
3291 // highlightCircleSize
3293 // Check if this set options will require new points.
3294 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3296 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3298 this.attributes_
.reparseSeries();
3302 if (!block_redraw
) this.start_();
3304 if (!block_redraw
) {
3305 if (requiresNewPoints
) {
3308 this.renderGraph_(false);
3315 * Returns a copy of the options with deprecated names converted into current
3316 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3317 * interested in that, they should save a copy before calling this.
3320 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3322 for (var k
in attrs
) {
3323 if (k
== 'file') continue;
3324 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3327 var set
= function(axis
, opt
, value
) {
3328 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3329 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3330 my_attrs
.axes
[axis
][opt
] = value
;
3332 var map
= function(opt
, axis
, new_opt
) {
3333 if (typeof(attrs
[opt
]) != 'undefined') {
3334 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3335 new_opt
+ " option for the " + axis
+ " axis instead. " +
3336 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3337 "(see http://dygraphs.com/per-axis.html for more information.");
3338 set(axis
, new_opt
, attrs
[opt
]);
3339 delete my_attrs
[opt
];
3343 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3344 map('xValueFormatter', 'x', 'valueFormatter');
3345 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3346 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3347 map('xTicker', 'x', 'ticker');
3348 map('yValueFormatter', 'y', 'valueFormatter');
3349 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3350 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3351 map('yTicker', 'y', 'ticker');
3356 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3357 * containing div (which has presumably changed size since the dygraph was
3358 * instantiated. If the width/height are specified, the div will be resized.
3360 * This is far more efficient than destroying and re-instantiating a
3361 * Dygraph, since it doesn't have to reparse the underlying data.
3363 * @param {Number} [width] Width (in pixels)
3364 * @param {Number} [height] Height (in pixels)
3366 Dygraph
.prototype.resize
= function(width
, height
) {
3367 if (this.resize_lock
) {
3370 this.resize_lock
= true;
3372 if ((width
=== null) != (height
=== null)) {
3373 this.warn("Dygraph.resize() should be called with zero parameters or " +
3374 "two non-NULL parameters. Pretending it was zero.");
3375 width
= height
= null;
3378 var old_width
= this.width_
;
3379 var old_height
= this.height_
;
3382 this.maindiv_
.style
.width
= width
+ "px";
3383 this.maindiv_
.style
.height
= height
+ "px";
3384 this.width_
= width
;
3385 this.height_
= height
;
3387 this.width_
= this.maindiv_
.clientWidth
;
3388 this.height_
= this.maindiv_
.clientHeight
;
3391 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3392 // TODO(danvk): there should be a clear() method.
3393 this.maindiv_
.innerHTML
= "";
3394 this.roller_
= null;
3395 this.attrs_
.labelsDiv
= null;
3396 this.createInterface_();
3397 if (this.annotations_
.length
) {
3398 // createInterface_ reset the layout, so we need to do this.
3399 this.layout_
.setAnnotations(this.annotations_
);
3404 this.resize_lock
= false;
3408 * Adjusts the number of points in the rolling average. Updates the graph to
3409 * reflect the new averaging period.
3410 * @param {Number} length Number of points over which to average the data.
3412 Dygraph
.prototype.adjustRoll
= function(length
) {
3413 this.rollPeriod_
= length
;
3418 * Returns a boolean array of visibility statuses.
3420 Dygraph
.prototype.visibility
= function() {
3421 // Do lazy-initialization, so that this happens after we know the number of
3423 if (!this.attr_("visibility")) {
3424 this.attrs_
.visibility
= [];
3426 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3427 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3428 this.attrs_
.visibility
.push(true);
3430 return this.attr_("visibility");
3434 * Changes the visiblity of a series.
3436 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3437 var x
= this.visibility();
3438 if (num
< 0 || num
>= x
.length
) {
3439 this.warn("invalid series number in setVisibility: " + num
);
3447 * How large of an area will the dygraph render itself in?
3448 * This is used for testing.
3449 * @return A {width: w, height: h} object.
3452 Dygraph
.prototype.size
= function() {
3453 return { width
: this.width_
, height
: this.height_
};
3457 * Update the list of annotations and redraw the chart.
3458 * See dygraphs.com/annotations.html for more info on how to use annotations.
3459 * @param ann {Array} An array of annotation objects.
3460 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3462 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3463 // Only add the annotation CSS rule once we know it will be used.
3464 Dygraph
.addAnnotationRule();
3465 this.annotations_
= ann
;
3466 this.layout_
.setAnnotations(this.annotations_
);
3467 if (!suppressDraw
) {
3473 * Return the list of annotations.
3475 Dygraph
.prototype.annotations
= function() {
3476 return this.annotations_
;
3480 * Get the list of label names for this graph. The first column is the
3481 * x-axis, so the data series names start at index 1.
3483 Dygraph
.prototype.getLabels
= function() {
3484 return this.attr_("labels").slice();
3488 * Get the index of a series (column) given its name. The first column is the
3489 * x-axis, so the data series start with index 1.
3491 Dygraph
.prototype.indexFromSetName
= function(name
) {
3492 return this.setIndexByName_
[name
];
3496 * Get the internal dataset index given its name. These are numbered starting from 0,
3497 * and only count visible sets.
3500 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3501 return this.datasetIndex_
[this.indexFromSetName(name
)];
3506 * Adds a default style for the annotation CSS classes to the document. This is
3507 * only executed when annotations are actually used. It is designed to only be
3508 * called once -- all calls after the first will return immediately.
3510 Dygraph
.addAnnotationRule
= function() {
3511 // TODO(danvk): move this function into plugins/annotations.js
?
3512 if (Dygraph
.addedAnnotationCSS
) return;
3514 var rule
= "border: 1px solid black; " +
3515 "background-color: white; " +
3516 "text-align: center;";
3518 var styleSheetElement
= document
.createElement("style");
3519 styleSheetElement
.type
= "text/css";
3520 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3522 // Find the first style sheet that we can access.
3523 // We may not add a rule to a style sheet from another domain for security
3524 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3525 // adds its own style sheets from google.com.
3526 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3527 if (document
.styleSheets
[i
].disabled
) continue;
3528 var mysheet
= document
.styleSheets
[i
];
3530 if (mysheet
.insertRule
) { // Firefox
3531 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3532 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3533 } else if (mysheet
.addRule
) { // IE
3534 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3536 Dygraph
.addedAnnotationCSS
= true;
3539 // Was likely a security exception.
3543 this.warn("Unable to add default annotation CSS rule; display may be off.");
3546 // Older pages may still use this name.
3547 var DateGraph
= Dygraph
;