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 // For max 60 Hz. animation:
95 Dygraph
.ANIMATION_STEPS
= 12;
96 Dygraph
.ANIMATION_DURATION
= 200;
98 // These are defined before DEFAULT_ATTRS so that it can refer to them.
101 * Return a string version of a number. This respects the digitsAfterDecimal
102 * and maxNumberWidth options.
103 * @param {Number} x The number to be formatted
104 * @param {Dygraph} opts An options view
105 * @param {String} name The name of the point's data series
106 * @param {Dygraph} g The dygraph object
108 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
109 var sigFigs
= opts('sigFigs');
111 if (sigFigs
!== null) {
112 // User has opted for a fixed number of significant figures.
113 return Dygraph
.floatFormat(x
, sigFigs
);
116 var digits
= opts('digitsAfterDecimal');
117 var maxNumberWidth
= opts('maxNumberWidth');
119 // switch to scientific notation if we underflow or overflow fixed display.
121 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
122 Math
.abs(x
) < Math
.pow(10, -digits
))) {
123 return x
.toExponential(digits
);
125 return '' + Dygraph
.round_(x
, digits
);
130 * variant for use as an axisLabelFormatter.
133 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
134 return Dygraph
.numberValueFormatter(x
, opts
, g
);
138 * Convert a JS date (millis since epoch) to YYYY/MM/DD
139 * @param {Number} date The JavaScript date (ms since epoch)
140 * @return {String} A date of the form "YYYY/MM/DD"
143 Dygraph
.dateString_
= function(date
) {
144 var zeropad
= Dygraph
.zeropad
;
145 var d
= new Date(date
);
148 var year
= "" + d
.getFullYear();
149 // Get a 0 padded month string
150 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
151 // Get a 0 padded day string
152 var day
= zeropad(d
.getDate());
155 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
156 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
158 return year
+ "/" + month + "/" + day
+ ret
;
162 * Convert a JS date to a string appropriate to display on an axis that
163 * is displaying values at the stated granularity.
164 * @param {Date} date The date to format
165 * @param {Number} granularity One of the Dygraph granularity constants
166 * @return {String} The formatted date
169 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
170 if (granularity
>= Dygraph
.DECADAL
) {
171 return date
.strftime('%Y');
172 } else if (granularity
>= Dygraph
.MONTHLY
) {
173 return date
.strftime('%b %y');
175 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
176 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
177 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
179 return Dygraph
.hmsString_(date
.getTime());
185 * Standard plotters. These may be used by clients.
186 * Available plotters are:
187 * - Dygraph.Plotters.linePlotter: draws central lines (most common)
188 * - Dygraph.Plotters.errorPlotter: draws error bars
189 * - Dygraph.Plotters.fillPlotter: draws fills under lines (used with fillGraph)
191 * By default, the plotter is [fillPlotter, errorPlotter, linePlotter].
192 * This causes all the lines to be drawn over all the fills/error bars.
194 Dygraph
.Plotters
= DygraphCanvasRenderer
._Plotters
;
197 // Default attribute values.
198 Dygraph
.DEFAULT_ATTRS
= {
199 highlightCircleSize
: 3,
200 highlightSeriesOpts
: null,
201 highlightSeriesBackgroundAlpha
: 0.5,
205 // TODO(danvk): move defaults from createStatusMessage_ here.
207 labelsSeparateLines
: false,
208 labelsShowZeroValues
: true,
211 showLabelsOnHighlight
: true,
213 digitsAfterDecimal
: 2,
218 strokeBorderWidth
: 0,
219 strokeBorderColor
: "white",
222 axisLabelFontSize
: 14,
228 xValueParser
: Dygraph
.dateParser
,
235 wilsonInterval
: true, // only relevant if fractions is true
239 connectSeparatedPoints
: false,
242 hideOverlayOnMouseOut
: true,
244 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
245 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
249 drawAxesAtZero
: false,
251 // Sizes of the various chart labels.
258 axisLineColor
: "black",
261 axisLabelColor
: "black",
262 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
266 gridLineColor
: "rgb(128,128,128)",
268 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
269 animatedZooms
: false, // (for now)
271 // Range selector options
272 showRangeSelector
: false,
273 rangeSelectorHeight
: 40,
274 rangeSelectorPlotStrokeColor
: "#808FAB",
275 rangeSelectorPlotFillColor
: "#A7B1C4",
277 // The ordering here ensures that central lines always appear above any
278 // fill bars/error bars
.
280 Dygraph
.Plotters
.fillPlotter
,
281 Dygraph
.Plotters
.errorPlotter
,
282 Dygraph
.Plotters
.linePlotter
289 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
290 valueFormatter
: Dygraph
.dateString_
,
291 ticker
: null // will be set in dygraph-tickers.js
295 valueFormatter
: Dygraph
.numberValueFormatter
,
296 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
297 ticker
: null // will be set in dygraph-tickers.js
301 valueFormatter
: Dygraph
.numberValueFormatter
,
302 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
303 ticker
: null // will be set in dygraph-tickers.js
308 // Directions for panning and zooming. Use bit operations when combined
309 // values are possible.
310 Dygraph
.HORIZONTAL
= 1;
311 Dygraph
.VERTICAL
= 2;
313 // Installed plugins, in order of precedence (most-general to most-specific).
314 // Plugins are installed after they are defined, in plugins/install.js
.
318 // Used for initializing annotation CSS rules only once.
319 Dygraph
.addedAnnotationCSS
= false;
321 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
322 // Labels is no longer a constructor parameter, since it's typically set
323 // directly from the data source. It also conains a name for the x-axis,
324 // which the previous constructor form did not.
325 if (labels
!== null) {
326 var new_labels
= ["Date"];
327 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
328 Dygraph
.update(attrs
, { 'labels': new_labels
});
330 this.__init__(div
, file
, attrs
);
334 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
335 * and context <canvas> inside of it. See the constructor for details.
337 * @param {Element} div the Element to render the graph into.
338 * @param {String | Function} file Source data
339 * @param {Object} attrs Miscellaneous other options
342 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
343 // Hack for IE: if we're using excanvas and the document hasn't finished
344 // loading yet (and hence may not have initialized whatever it needs to
345 // initialize), then keep calling this routine periodically until it has.
346 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
347 typeof(G_vmlCanvasManager
) != 'undefined' &&
348 document
.readyState
!= 'complete') {
350 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
354 // Support two-argument constructor
355 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
357 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
359 if (typeof(div
) == 'string') {
360 div
= document
.getElementById(div
);
364 Dygraph
.error("Constructing dygraph with a non-existent div!");
368 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
370 // Copy the important bits into the object
371 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
374 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
375 this.previousVerticalX_
= -1;
376 this.fractions_
= attrs
.fractions
|| false;
377 this.dateWindow_
= attrs
.dateWindow
|| null;
379 this.is_initial_draw_
= true;
380 this.annotations_
= [];
382 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
383 this.zoomed_x_
= false;
384 this.zoomed_y_
= false;
386 // Clear the div. This ensure that, if multiple dygraphs are passed the same
387 // div, then only one will be drawn.
390 // For historical reasons, the 'width' and 'height' options trump all CSS
391 // rules _except_ for an explicit 'width' or 'height' on the div.
392 // As an added convenience, if the div has zero height (like <div></div> does
393 // without any styles), then we use a default height/width
.
394 if (div
.style
.width
=== '' && attrs
.width
) {
395 div
.style
.width
= attrs
.width
+ "px";
397 if (div
.style
.height
=== '' && attrs
.height
) {
398 div
.style
.height
= attrs
.height
+ "px";
400 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
401 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
402 if (div
.style
.width
=== '') {
403 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
406 // these will be zero if the dygraph's div is hidden.
407 this.width_
= div
.clientWidth
;
408 this.height_
= div
.clientHeight
;
410 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
411 if (attrs
.stackedGraph
) {
412 attrs
.fillGraph
= true;
413 // TODO(nikhilk): Add any other stackedGraph checks here.
416 // These two options have a bad interaction. See issue 359.
417 if (attrs
.showRangeSelector
&& attrs
.animatedZooms
) {
418 this.warn('You should not set animatedZooms=true when using the range selector.');
419 attrs
.animatedZooms
= false;
422 // DEPRECATION WARNING: All option processing should be moved from
423 // attrs_ and user_attrs_ to options_, which holds all this information.
425 // Dygraphs has many options, some of which interact with one another.
426 // To keep track of everything, we maintain two sets of options:
428 // this.user_attrs_ only options explicitly set by the user.
429 // this.attrs_ defaults, options derived from user_attrs_, data.
431 // Options are then accessed this.attr_('attr'), which first looks at
432 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
433 // defaults without overriding behavior that the user specifically asks for.
434 this.user_attrs_
= {};
435 Dygraph
.update(this.user_attrs_
, attrs
);
437 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
439 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
441 this.boundaryIds_
= [];
442 this.setIndexByName_
= {};
443 this.datasetIndex_
= [];
445 this.registeredEvents_
= [];
446 this.eventListeners_
= {};
448 this.attributes_
= new DygraphOptions(this);
450 // Create the containing DIV and other interactive elements
451 this.createInterface_();
455 for (var i
= 0; i
< Dygraph
.PLUGINS
.length
; i
++) {
456 var Plugin
= Dygraph
.PLUGINS
[i
];
457 var pluginInstance
= new Plugin();
459 plugin
: pluginInstance
,
465 var handlers
= pluginInstance
.activate(this);
466 for (var eventName
in handlers
) {
467 // TODO(danvk): validate eventName.
468 pluginDict
.events
[eventName
] = handlers
[eventName
];
471 this.plugins_
.push(pluginDict
);
474 // At this point, plugins can no longer register event handlers.
475 // Construct a map from event -> ordered list of [callback, plugin].
476 for (var i
= 0; i
< this.plugins_
.length
; i
++) {
477 var plugin_dict
= this.plugins_
[i
];
478 for (var eventName
in plugin_dict
.events
) {
479 if (!plugin_dict
.events
.hasOwnProperty(eventName
)) continue;
480 var callback
= plugin_dict
.events
[eventName
];
482 var pair
= [plugin_dict
.plugin
, callback
];
483 if (!(eventName
in this.eventListeners_
)) {
484 this.eventListeners_
[eventName
] = [pair
];
486 this.eventListeners_
[eventName
].push(pair
);
495 * Triggers a cascade of events to the various plugins which are interested in them.
496 * Returns true if the "default behavior" should be performed, i.e. if none of
497 * the event listeners called event.preventDefault().
500 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
501 if (!(name
in this.eventListeners_
)) return true;
503 // QUESTION: can we use objects & prototypes to speed this up?
507 defaultPrevented
: false,
508 preventDefault
: function() {
509 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
510 e
.defaultPrevented
= true;
512 propagationStopped
: false,
513 stopPropagation
: function() {
514 e
.propagationStopped
= true;
517 Dygraph
.update(e
, extra_props
);
519 var callback_plugin_pairs
= this.eventListeners_
[name
];
520 if (callback_plugin_pairs
) {
521 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
522 var plugin
= callback_plugin_pairs
[i
][0];
523 var callback
= callback_plugin_pairs
[i
][1];
524 callback
.call(plugin
, e
);
525 if (e
.propagationStopped
) break;
528 return e
.defaultPrevented
;
532 * Returns the zoomed status of the chart for one or both axes.
534 * Axis is an optional parameter. Can be set to 'x' or 'y'.
536 * The zoomed status for an axis is set whenever a user zooms using the mouse
537 * or when the dateWindow or valueRange are updated (unless the
538 * isZoomedIgnoreProgrammaticZoom option is also specified).
540 Dygraph
.prototype.isZoomed
= function(axis
) {
541 if (axis
=== null || axis
=== undefined
) {
542 return this.zoomed_x_
|| this.zoomed_y_
;
544 if (axis
=== 'x') return this.zoomed_x_
;
545 if (axis
=== 'y') return this.zoomed_y_
;
546 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
550 * Returns information about the Dygraph object, including its containing ID.
552 Dygraph
.prototype.toString
= function() {
553 var maindiv
= this.maindiv_
;
554 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
555 return "[Dygraph " + id
+ "]";
560 * Returns the value of an option. This may be set by the user (either in the
561 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
563 * @param { String } name The name of the option, e.g. 'rollPeriod'.
564 * @param { String } [seriesName] The name of the series to which the option
565 * will be applied. If no per-series value of this option is available, then
566 * the global value is returned. This is optional.
567 * @return { ... } The value of the option.
569 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
570 // <REMOVE_FOR_COMBINED>
571 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
572 this.error('Must include options reference JS for testing');
573 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
574 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
575 'in the Dygraphs.OPTIONS_REFERENCE listing.');
576 // Only log this error once.
577 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
579 // </REMOVE_FOR_COMBINED
>
580 return seriesName
? this.attributes_
.getForSeries(name
, seriesName
) : this.attributes_
.get(name
);
584 * Returns the current value for an option, as set in the constructor or via
585 * updateOptions. You may pass in an (optional) series name to get per-series
586 * values for the option.
588 * All values returned by this method should be considered immutable. If you
589 * modify them, there is no guarantee that the changes will be honored or that
590 * dygraphs will remain in a consistent state. If you want to modify an option,
591 * use updateOptions() instead.
593 * @param { String } name The name of the option (e.g. 'strokeWidth')
594 * @param { String } [opt_seriesName] Series name to get per-series values.
595 * @return { ... } The value of the option.
597 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
598 return this.attr_(name
, opt_seriesName
);
603 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
604 * @return { ... } A function mapping string -> option value
606 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
608 return function(opt
) {
609 var axis_opts
= self
.user_attrs_
.axes
;
610 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
611 return axis_opts
[axis
][opt
];
613 // user-specified attributes always trump defaults, even if they're less
615 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
616 return self
.user_attrs_
[opt
];
619 axis_opts
= self
.attrs_
.axes
;
620 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
621 return axis_opts
[axis
][opt
];
623 // check old-style axis options
624 // TODO(danvk): add a deprecation warning if either of these match.
625 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
626 return self
.axes_
[0][opt
];
627 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
628 return self
.axes_
[1][opt
];
630 return self
.attr_(opt
);
635 * Returns the current rolling period, as set by the user or an option.
636 * @return {Number} The number of points in the rolling window
638 Dygraph
.prototype.rollPeriod
= function() {
639 return this.rollPeriod_
;
643 * Returns the currently-visible x-range. This can be affected by zooming,
644 * panning or a call to updateOptions.
645 * Returns a two-element array: [left, right].
646 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
648 Dygraph
.prototype.xAxisRange
= function() {
649 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
653 * Returns the lower- and upper-bound x-axis values of the
656 Dygraph
.prototype.xAxisExtremes
= function() {
657 var left
= this.rawData_
[0][0];
658 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
659 return [left
, right
];
663 * Returns the currently-visible y-range for an axis. This can be affected by
664 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
665 * called with no arguments, returns the range of the first axis.
666 * Returns a two-element array: [bottom, top].
668 Dygraph
.prototype.yAxisRange
= function(idx
) {
669 if (typeof(idx
) == "undefined") idx
= 0;
670 if (idx
< 0 || idx
>= this.axes_
.length
) {
673 var axis
= this.axes_
[idx
];
674 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
678 * Returns the currently-visible y-ranges for each axis. This can be affected by
679 * zooming, panning, calls to updateOptions, etc.
680 * Returns an array of [bottom, top] pairs, one for each y-axis.
682 Dygraph
.prototype.yAxisRanges
= function() {
684 for (var i
= 0; i
< this.axes_
.length
; i
++) {
685 ret
.push(this.yAxisRange(i
));
690 // TODO(danvk): use these functions throughout dygraphs.
692 * Convert from data coordinates to canvas/div X/Y coordinates.
693 * If specified, do this conversion for the coordinate system of a particular
694 * axis. Uses the first axis by default.
695 * Returns a two-element array: [X, Y]
697 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
698 * instead of toDomCoords(null, y, axis).
700 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
701 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
705 * Convert from data x coordinates to canvas/div X coordinate.
706 * If specified, do this conversion for the coordinate system of a particular
708 * Returns a single value or null if x is null.
710 Dygraph
.prototype.toDomXCoord
= function(x
) {
715 var area
= this.plotter_
.area
;
716 var xRange
= this.xAxisRange();
717 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
721 * Convert from data x coordinates to canvas/div Y coordinate and optional
722 * axis. Uses the first axis by default.
724 * returns a single value or null if y is null.
726 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
727 var pct
= this.toPercentYCoord(y
, axis
);
732 var area
= this.plotter_
.area
;
733 return area
.y
+ pct
* area
.h
;
737 * Convert from canvas/div coords to data coordinates.
738 * If specified, do this conversion for the coordinate system of a particular
739 * axis. Uses the first axis by default.
740 * Returns a two-element array: [X, Y].
742 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
743 * instead of toDataCoords(null, y, axis).
745 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
746 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
750 * Convert from canvas/div x coordinate to data coordinate.
752 * If x is null, this returns null.
754 Dygraph
.prototype.toDataXCoord
= function(x
) {
759 var area
= this.plotter_
.area
;
760 var xRange
= this.xAxisRange();
761 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
765 * Convert from canvas/div y coord to value.
767 * If y is null, this returns null.
768 * if axis is null, this uses the first axis.
770 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
775 var area
= this.plotter_
.area
;
776 var yRange
= this.yAxisRange(axis
);
778 if (typeof(axis
) == "undefined") axis
= 0;
779 if (!this.axes_
[axis
].logscale
) {
780 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
782 // Computing the inverse of toDomCoord.
783 var pct
= (y
- area
.y
) / area
.h
;
785 // Computing the inverse of toPercentYCoord. The function was arrived at with
786 // the following steps:
788 // Original calcuation:
789 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
791 // Move denominator to both sides:
792 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
794 // subtract logr1, and take the negative value.
795 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
797 // Swap both sides of the equation, and we can compute the log of the
798 // return value. Which means we just need to use that as the exponent in
800 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
802 var logr1
= Dygraph
.log10(yRange
[1]);
803 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
804 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
810 * Converts a y for an axis to a percentage from the top to the
811 * bottom of the drawing area.
813 * If the coordinate represents a value visible on the canvas, then
814 * the value will be between 0 and 1, where 0 is the top of the canvas.
815 * However, this method will return values outside the range, as
816 * values can fall outside the canvas.
818 * If y is null, this returns null.
819 * if axis is null, this uses the first axis.
821 * @param { Number } y The data y-coordinate.
822 * @param { Number } [axis] The axis number on which the data coordinate lives.
823 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
825 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
829 if (typeof(axis
) == "undefined") axis
= 0;
831 var yRange
= this.yAxisRange(axis
);
834 if (!this.axes_
[axis
].logscale
) {
835 // yRange[1] - y is unit distance from the bottom.
836 // yRange[1] - yRange[0] is the scale of the range.
837 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
838 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
840 var logr1
= Dygraph
.log10(yRange
[1]);
841 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
847 * Converts an x value to a percentage from the left to the right of
850 * If the coordinate represents a value visible on the canvas, then
851 * the value will be between 0 and 1, where 0 is the left of the canvas.
852 * However, this method will return values outside the range, as
853 * values can fall outside the canvas.
855 * If x is null, this returns null.
856 * @param { Number } x The data x-coordinate.
857 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
859 Dygraph
.prototype.toPercentXCoord
= function(x
) {
864 var xRange
= this.xAxisRange();
865 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
869 * Returns the number of columns (including the independent variable).
870 * @return { Integer } The number of columns.
872 Dygraph
.prototype.numColumns
= function() {
873 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
877 * Returns the number of rows (excluding any header/label row).
878 * @return { Integer } The number of rows, less any header.
880 Dygraph
.prototype.numRows
= function() {
881 return this.rawData_
.length
;
885 * Returns the full range of the x-axis, as determined by the most extreme
886 * values in the data set. Not affected by zooming, visibility, etc.
887 * TODO(danvk): merge w/ xAxisExtremes
888 * @return { Array<Number> } A [low, high] pair
891 Dygraph
.prototype.fullXRange_
= function() {
892 if (this.numRows() > 0) {
893 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
900 * Returns the value in the given row and column. If the row and column exceed
901 * the bounds on the data, returns null. Also returns null if the value is
903 * @param { Number} row The row number of the data (0-based). Row 0 is the
904 * first row of data, not a header row.
905 * @param { Number} col The column number of the data (0-based)
906 * @return { Number } The value in the specified cell or null if the row/col
909 Dygraph
.prototype.getValue
= function(row
, col
) {
910 if (row
< 0 || row
> this.rawData_
.length
) return null;
911 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
913 return this.rawData_
[row
][col
];
917 * Generates interface elements for the Dygraph: a containing div, a div to
918 * display the current point, and a textbox to adjust the rolling average
919 * period. Also creates the Renderer/Layout elements.
922 Dygraph
.prototype.createInterface_
= function() {
923 // Create the all-enclosing graph div
924 var enclosing
= this.maindiv_
;
926 this.graphDiv
= document
.createElement("div");
927 this.graphDiv
.style
.width
= this.width_
+ "px";
928 this.graphDiv
.style
.height
= this.height_
+ "px";
929 enclosing
.appendChild(this.graphDiv
);
931 // Create the canvas for interactive parts of the chart.
932 this.canvas_
= Dygraph
.createCanvas();
933 this.canvas_
.style
.position
= "absolute";
934 this.canvas_
.width
= this.width_
;
935 this.canvas_
.height
= this.height_
;
936 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
937 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
939 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
941 // ... and for static parts of the chart.
942 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
943 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
945 if (this.attr_('showRangeSelector')) {
946 // The range selector must be created here so that its canvases and contexts get created here.
947 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
948 this.rangeSelector_
= new DygraphRangeSelector(this);
951 // The interactive parts of the graph are drawn on top of the chart.
952 this.graphDiv
.appendChild(this.hidden_
);
953 this.graphDiv
.appendChild(this.canvas_
);
954 this.mouseEventElement_
= this.createMouseEventElement_();
956 // Create the grapher
957 this.layout_
= new DygraphLayout(this);
959 if (this.rangeSelector_
) {
960 // This needs to happen after the graph canvases are added to the div and the layout object is created.
961 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
966 this.mouseMoveHandler
= function(e
) {
967 dygraph
.mouseMove_(e
);
969 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
971 this.mouseOutHandler
= function(e
) {
972 dygraph
.mouseOut_(e
);
974 this.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
976 this.createDragInterface_();
978 this.resizeHandler
= function(e
) {
982 // Update when the window is resized.
983 // TODO(danvk): drop frames depending on complexity of the chart.
984 this.addEvent(window
, 'resize', this.resizeHandler
);
988 * Detach DOM elements in the dygraph and null out all data references.
989 * Calling this when you're done with a dygraph can dramatically reduce memory
990 * usage. See, e.g., the tests/perf.html example.
992 Dygraph
.prototype.destroy
= function() {
993 var removeRecursive
= function(node
) {
994 while (node
.hasChildNodes()) {
995 removeRecursive(node
.firstChild
);
996 node
.removeChild(node
.firstChild
);
1000 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
1001 var reg
= this.registeredEvents_
[idx
];
1002 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
1004 this.registeredEvents_
= [];
1006 // remove mouse event handlers (This may not be necessary anymore)
1007 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
1008 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
1009 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
1010 removeRecursive(this.maindiv_
);
1012 var nullOut
= function(obj
) {
1013 for (var n
in obj
) {
1014 if (typeof(obj
[n
]) === 'object') {
1019 // remove event handlers
1020 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
1021 this.resizeHandler
= null;
1022 // These may not all be necessary, but it can't hurt...
1023 nullOut(this.layout_
);
1024 nullOut(this.plotter_
);
1029 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1030 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1031 * or the zoom rectangles) is done on this.canvas_.
1032 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1033 * @return {Object} The newly-created canvas
1036 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1037 var h
= Dygraph
.createCanvas();
1038 h
.style
.position
= "absolute";
1039 // TODO(danvk): h should be offset from canvas. canvas needs to include
1040 // some extra area to make it easier to zoom in on the far left and far
1041 // right. h needs to be precisely the plot area, so that clipping occurs.
1042 h
.style
.top
= canvas
.style
.top
;
1043 h
.style
.left
= canvas
.style
.left
;
1044 h
.width
= this.width_
;
1045 h
.height
= this.height_
;
1046 h
.style
.width
= this.width_
+ "px"; // for IE
1047 h
.style
.height
= this.height_
+ "px"; // for IE
1052 * Creates an overlay element used to handle mouse events.
1053 * @return {Object} The mouse event element.
1056 Dygraph
.prototype.createMouseEventElement_
= function() {
1057 if (this.isUsingExcanvas_
) {
1058 var elem
= document
.createElement("div");
1059 elem
.style
.position
= 'absolute';
1060 elem
.style
.backgroundColor
= 'white';
1061 elem
.style
.filter
= 'alpha(opacity=0)';
1062 elem
.style
.width
= this.width_
+ "px";
1063 elem
.style
.height
= this.height_
+ "px";
1064 this.graphDiv
.appendChild(elem
);
1067 return this.canvas_
;
1072 * Generate a set of distinct colors for the data series. This is done with a
1073 * color wheel. Saturation/Value are customizable, and the hue is
1074 * equally-spaced around the color wheel. If a custom set of colors is
1075 * specified, that is used instead.
1078 Dygraph
.prototype.setColors_
= function() {
1079 var labels
= this.getLabels();
1080 var num
= labels
.length
- 1;
1082 this.colorsMap_
= {};
1083 var colors
= this.attr_('colors');
1086 var sat
= this.attr_('colorSaturation') || 1.0;
1087 var val
= this.attr_('colorValue') || 0.5;
1088 var half
= Math
.ceil(num
/ 2);
1089 for (i
= 1; i
<= num
; i
++) {
1090 if (!this.visibility()[i
-1]) continue;
1091 // alternate colors for high contrast.
1092 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1093 var hue
= (1.0 * idx
/ (1 + num
));
1094 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1095 this.colors_
.push(colorStr
);
1096 this.colorsMap_
[labels
[i
]] = colorStr
;
1099 for (i
= 0; i
< num
; i
++) {
1100 if (!this.visibility()[i
]) continue;
1101 var colorStr
= colors
[i
% colors
.length
];
1102 this.colors_
.push(colorStr
);
1103 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1109 * Return the list of colors. This is either the list of colors passed in the
1110 * attributes or the autogenerated list of rgb(r,g,b) strings.
1111 * This does not return colors for invisible series.
1112 * @return {Array<string>} The list of colors.
1114 Dygraph
.prototype.getColors
= function() {
1115 return this.colors_
;
1119 * Returns a few attributes of a series, i.e. its color, its visibility, which
1120 * axis it's assigned to, and its column in the original data.
1121 * Returns null if the series does not exist.
1122 * Otherwise, returns an object with column, visibility, color and axis properties.
1123 * The "axis" property will be set to 1 for y1 and 2 for y2.
1124 * The "column" property can be fed back into getValue(row, column) to get
1125 * values for this series.
1127 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1129 var labels
= this.getLabels();
1130 for (var i
= 1; i
< labels
.length
; i
++) {
1131 if (labels
[i
] == series_name
) {
1136 if (idx
== -1) return null;
1141 visible
: this.visibility()[idx
- 1],
1142 color
: this.colorsMap_
[series_name
],
1143 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1148 * Create the text box to adjust the averaging period
1151 Dygraph
.prototype.createRollInterface_
= function() {
1152 // Create a roller if one doesn't exist already.
1153 if (!this.roller_
) {
1154 this.roller_
= document
.createElement("input");
1155 this.roller_
.type
= "text";
1156 this.roller_
.style
.display
= "none";
1157 this.graphDiv
.appendChild(this.roller_
);
1160 var display
= this.attr_('showRoller') ? 'block' : 'none';
1162 var area
= this.plotter_
.area
;
1163 var textAttr
= { "position": "absolute",
1165 "top": (area
.y
+ area
.h
- 25) + "px",
1166 "left": (area
.x
+ 1) + "px",
1169 this.roller_
.size
= "2";
1170 this.roller_
.value
= this.rollPeriod_
;
1171 for (var name
in textAttr
) {
1172 if (textAttr
.hasOwnProperty(name
)) {
1173 this.roller_
.style
[name
] = textAttr
[name
];
1178 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1183 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1184 * canvas (i.e. DOM Coords).
1186 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1187 return Dygraph
.pageX(e
) - context
.px
;
1192 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1193 * canvas (i.e. DOM Coords).
1195 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1196 return Dygraph
.pageY(e
) - context
.py
;
1200 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1204 Dygraph
.prototype.createDragInterface_
= function() {
1206 // Tracks whether the mouse is down right now
1208 isPanning
: false, // is this drag part of a pan?
1209 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1210 dragStartX
: null, // pixel coordinates
1211 dragStartY
: null, // pixel coordinates
1212 dragEndX
: null, // pixel coordinates
1213 dragEndY
: null, // pixel coordinates
1214 dragDirection
: null,
1215 prevEndX
: null, // pixel coordinates
1216 prevEndY
: null, // pixel coordinates
1217 prevDragDirection
: null,
1218 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1220 // The value on the left side of the graph when a pan operation starts.
1221 initialLeftmostDate
: null,
1223 // The number of units each pixel spans. (This won't be valid for log
1225 xUnitsPerPixel
: null,
1227 // TODO(danvk): update this comment
1228 // The range in second/value units that the viewport encompasses during a
1229 // panning operation.
1232 // Top-left corner of the canvas, in DOM coords
1233 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1237 // Values for use with panEdgeFraction, which limit how far outside the
1238 // graph's data boundaries it can be panned.
1239 boundedDates
: null, // [minDate, maxDate]
1240 boundedValues
: null, // [[minValue, maxValue] ...]
1242 // We cover iframes during mouse interactions. See comments in
1243 // dygraph-utils.js for more info on why this is a good idea.
1244 tarp
: new Dygraph
.IFrameTarp(),
1246 // contextB is the same thing as this context object but renamed.
1247 initializeMouseDown
: function(event
, g
, contextB
) {
1248 // prevents mouse drags from selecting page text.
1249 if (event
.preventDefault
) {
1250 event
.preventDefault(); // Firefox, Chrome, etc.
1252 event
.returnValue
= false; // IE
1253 event
.cancelBubble
= true;
1256 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1257 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1258 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1259 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1260 contextB
.cancelNextDblclick
= false;
1261 contextB
.tarp
.cover();
1265 var interactionModel
= this.attr_("interactionModel");
1267 // Self is the graph.
1270 // Function that binds the graph and context to the handler.
1271 var bindHandler
= function(handler
) {
1272 return function(event
) {
1273 handler(event
, self
, context
);
1277 for (var eventName
in interactionModel
) {
1278 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1279 this.addEvent(this.mouseEventElement_
, eventName
,
1280 bindHandler(interactionModel
[eventName
]));
1283 // If the user releases the mouse button during a drag, but not over the
1284 // canvas, then it doesn't count as a zooming action.
1285 this.mouseUpHandler_
= function(event
) {
1286 if (context
.isZooming
|| context
.isPanning
) {
1287 context
.isZooming
= false;
1288 context
.dragStartX
= null;
1289 context
.dragStartY
= null;
1292 if (context
.isPanning
) {
1293 context
.isPanning
= false;
1294 context
.draggingDate
= null;
1295 context
.dateRange
= null;
1296 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1297 delete self
.axes_
[i
].draggingValue
;
1298 delete self
.axes_
[i
].dragValueRange
;
1302 context
.tarp
.uncover();
1305 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1309 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1310 * up any previous zoom rectangles that were drawn. This could be optimized to
1311 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1314 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1315 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1316 * @param {Number} startX The X position where the drag started, in canvas
1318 * @param {Number} endX The current X position of the drag, in canvas coords.
1319 * @param {Number} startY The Y position where the drag started, in canvas
1321 * @param {Number} endY The current Y position of the drag, in canvas coords.
1322 * @param {Number} prevDirection the value of direction on the previous call to
1323 * this function. Used to avoid excess redrawing
1324 * @param {Number} prevEndX The value of endX on the previous call to this
1325 * function. Used to avoid excess redrawing
1326 * @param {Number} prevEndY The value of endY on the previous call to this
1327 * function. Used to avoid excess redrawing
1330 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1331 endY
, prevDirection
, prevEndX
,
1333 var ctx
= this.canvas_ctx_
;
1335 // Clean up from the previous rect if necessary
1336 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1337 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1338 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1339 } else if (prevDirection
== Dygraph
.VERTICAL
){
1340 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1341 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1344 // Draw a light-grey rectangle to show the new viewing area
1345 if (direction
== Dygraph
.HORIZONTAL
) {
1346 if (endX
&& startX
) {
1347 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1348 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1349 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1351 } else if (direction
== Dygraph
.VERTICAL
) {
1352 if (endY
&& startY
) {
1353 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1354 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1355 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1359 if (this.isUsingExcanvas_
) {
1360 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1365 * Clear the zoom rectangle (and perform no zoom).
1368 Dygraph
.prototype.clearZoomRect_
= function() {
1369 this.currentZoomRectArgs_
= null;
1370 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1374 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1375 * the canvas. The exact zoom window may be slightly larger if there are no data
1376 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1377 * which accepts dates that match the raw data. This function redraws the graph.
1379 * @param {Number} lowX The leftmost pixel value that should be visible.
1380 * @param {Number} highX The rightmost pixel value that should be visible.
1383 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1384 this.currentZoomRectArgs_
= null;
1385 // Find the earliest and latest dates contained in this canvasx range.
1386 // Convert the call to date ranges of the raw data.
1387 var minDate
= this.toDataXCoord(lowX
);
1388 var maxDate
= this.toDataXCoord(highX
);
1389 this.doZoomXDates_(minDate
, maxDate
);
1393 * Transition function to use in animations. Returns values between 0.0
1394 * (totally old values) and 1.0 (totally new values) for each frame.
1397 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1399 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1403 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1404 * method with doZoomX which accepts pixel coordinates. This function redraws
1407 * @param {Number} minDate The minimum date that should be visible.
1408 * @param {Number} maxDate The maximum date that should be visible.
1411 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1412 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1413 // can produce strange effects. Rather than the y-axis transitioning slowly
1414 // between values, it can jerk around.)
1415 var old_window
= this.xAxisRange();
1416 var new_window
= [minDate
, maxDate
];
1417 this.zoomed_x_
= true;
1419 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1420 if (that
.attr_("zoomCallback")) {
1421 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1427 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1428 * the canvas. This function redraws the graph.
1430 * @param {Number} lowY The topmost pixel value that should be visible.
1431 * @param {Number} highY The lowest pixel value that should be visible.
1434 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1435 this.currentZoomRectArgs_
= null;
1436 // Find the highest and lowest values in pixel range for each axis.
1437 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1438 // This is because pixels increase as you go down on the screen, whereas data
1439 // coordinates increase as you go up the screen.
1440 var oldValueRanges
= this.yAxisRanges();
1441 var newValueRanges
= [];
1442 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1443 var hi
= this.toDataYCoord(lowY
, i
);
1444 var low
= this.toDataYCoord(highY
, i
);
1445 newValueRanges
.push([low
, hi
]);
1448 this.zoomed_y_
= true;
1450 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1451 if (that
.attr_("zoomCallback")) {
1452 var xRange
= that
.xAxisRange();
1453 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1459 * Reset the zoom to the original view coordinates. This is the same as
1460 * double-clicking on the graph.
1464 Dygraph
.prototype.doUnzoom_
= function() {
1465 var dirty
= false, dirtyX
= false, dirtyY
= false;
1466 if (this.dateWindow_
!== null) {
1471 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1472 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1478 // Clear any selection, since it's likely to be drawn in the wrong place.
1479 this.clearSelection();
1482 this.zoomed_x_
= false;
1483 this.zoomed_y_
= false;
1485 var minDate
= this.rawData_
[0][0];
1486 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1488 // With only one frame, don't bother calculating extreme ranges.
1489 // TODO(danvk): merge this block w/ the code below
.
1490 if (!this.attr_("animatedZooms")) {
1491 this.dateWindow_
= null;
1492 for (i
= 0; i
< this.axes_
.length
; i
++) {
1493 if (this.axes_
[i
].valueWindow
!== null) {
1494 delete this.axes_
[i
].valueWindow
;
1498 if (this.attr_("zoomCallback")) {
1499 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1504 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1506 oldWindow
= this.xAxisRange();
1507 newWindow
= [minDate
, maxDate
];
1511 oldValueRanges
= this.yAxisRanges();
1512 // TODO(danvk): this is pretty inefficient
1513 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1514 var extremes
= packed
[1];
1516 // this has the side-effect of modifying this.axes_.
1517 // this doesn't make much sense in this context, but it's convenient (we
1518 // need this.axes_[*].extremeValues) and not harmful since we'll be
1519 // calling drawGraph_ shortly, which clobbers these values.
1520 this.computeYAxisRanges_(extremes
);
1522 newValueRanges
= [];
1523 for (i
= 0; i
< this.axes_
.length
; i
++) {
1524 var axis
= this.axes_
[i
];
1525 newValueRanges
.push((axis
.valueRange
!== null &&
1526 axis
.valueRange
!== undefined
) ?
1527 axis
.valueRange
: axis
.extremeRange
);
1532 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1534 that
.dateWindow_
= null;
1535 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1536 if (that
.axes_
[i
].valueWindow
!== null) {
1537 delete that
.axes_
[i
].valueWindow
;
1540 if (that
.attr_("zoomCallback")) {
1541 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1548 * Combined animation logic for all zoom functions.
1549 * either the x parameters or y parameters may be null.
1552 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1553 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1556 var valueRanges
= [];
1559 if (oldXRange
!== null && newXRange
!== null) {
1560 for (step
= 1; step
<= steps
; step
++) {
1561 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1562 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1563 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1567 if (oldYRanges
!== null && newYRanges
!== null) {
1568 for (step
= 1; step
<= steps
; step
++) {
1569 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1571 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1572 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1573 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1575 valueRanges
[step
-1] = thisRange
;
1580 Dygraph
.repeatAndCleanup(function(step
) {
1581 if (valueRanges
.length
) {
1582 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1583 var w
= valueRanges
[step
][i
];
1584 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1587 if (windows
.length
) {
1588 that
.dateWindow_
= windows
[step
];
1591 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1595 * Get the current graph's area object.
1597 * Returns: {x, y, w, h}
1599 Dygraph
.prototype.getArea
= function() {
1600 return this.plotter_
.area
;
1604 * Convert a mouse event to DOM coordinates relative to the graph origin.
1606 * Returns a two-element array: [X, Y].
1608 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1609 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1610 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1611 return [canvasx
, canvasy
];
1615 * Given a canvas X coordinate, find the closest row.
1616 * @param {Number} domX graph-relative DOM X coordinate
1617 * Returns: row number, integer
1620 Dygraph
.prototype.findClosestRow
= function(domX
) {
1621 var minDistX
= Infinity
;
1622 var pointIdx
= -1, setIdx
= -1;
1623 var sets
= this.layout_
.points
;
1624 for (var i
= 0; i
< sets
.length
; i
++) {
1625 var points
= sets
[i
];
1626 var len
= points
.length
;
1627 for (var j
= 0; j
< len
; j
++) {
1628 var point
= points
[j
];
1629 if (!Dygraph
.isValidPoint(point
, true)) continue;
1630 var dist
= Math
.abs(point
.canvasx
- domX
);
1631 if (dist
< minDistX
) {
1639 // TODO(danvk): remove this function; it's trivial and has only one use.
1640 return this.idxToRow_(setIdx
, pointIdx
);
1644 * Given canvas X,Y coordinates, find the closest point.
1646 * This finds the individual data point across all visible series
1647 * that's closest to the supplied DOM coordinates using the standard
1648 * Euclidean X,Y distance.
1650 * @param {Number} domX graph-relative DOM X coordinate
1651 * @param {Number} domY graph-relative DOM Y coordinate
1652 * Returns: {row, seriesName, point}
1655 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1656 var minDist
= Infinity
;
1658 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1659 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1660 var points
= this.layout_
.points
[setIdx
];
1661 for (var i
= 0; i
< points
.length
; ++i
) {
1662 var point
= points
[i
];
1663 if (!Dygraph
.isValidPoint(point
)) continue;
1664 dx
= point
.canvasx
- domX
;
1665 dy
= point
.canvasy
- domY
;
1666 dist
= dx
* dx
+ dy
* dy
;
1667 if (dist
< minDist
) {
1669 closestPoint
= point
;
1670 closestSeries
= setIdx
;
1675 var name
= this.layout_
.setNames
[closestSeries
];
1677 row
: idx
+ this.getLeftBoundary_(),
1684 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1686 * This first finds the X data point closest to the supplied DOM X coordinate,
1687 * then finds the series which puts the Y coordinate on top of its filled area,
1688 * using linear interpolation between adjacent point pairs.
1690 * @param {Number} domX graph-relative DOM X coordinate
1691 * @param {Number} domY graph-relative DOM Y coordinate
1692 * Returns: {row, seriesName, point}
1695 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1696 var row
= this.findClosestRow(domX
);
1697 var boundary
= this.getLeftBoundary_();
1698 var rowIdx
= row
- boundary
;
1699 var sets
= this.layout_
.points
;
1700 var closestPoint
, closestSeries
;
1701 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1702 var points
= this.layout_
.points
[setIdx
];
1703 if (rowIdx
>= points
.length
) continue;
1704 var p1
= points
[rowIdx
];
1705 if (!Dygraph
.isValidPoint(p1
)) continue;
1706 var py
= p1
.canvasy
;
1707 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1708 // interpolate series Y value using next point
1709 var p2
= points
[rowIdx
+ 1];
1710 if (Dygraph
.isValidPoint(p2
)) {
1711 var dx
= p2
.canvasx
- p1
.canvasx
;
1713 var r
= (domX
- p1
.canvasx
) / dx
;
1714 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1717 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1718 // interpolate series Y value using previous point
1719 var p0
= points
[rowIdx
- 1];
1720 if (Dygraph
.isValidPoint(p0
)) {
1721 var dx
= p1
.canvasx
- p0
.canvasx
;
1723 var r
= (p1
.canvasx
- domX
) / dx
;
1724 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1728 // Stop if the point (domX, py) is above this series' upper edge
1729 if (setIdx
=== 0 || py
< domY
) {
1731 closestSeries
= setIdx
;
1734 var name
= this.layout_
.setNames
[closestSeries
];
1743 * When the mouse moves in the canvas, display information about a nearby data
1744 * point and draw dots over those points in the data series. This function
1745 * takes care of cleanup of previously-drawn dots.
1746 * @param {Object} event The mousemove event from the browser.
1749 Dygraph
.prototype.mouseMove_
= function(event
) {
1750 // This prevents JS errors when mousing over the canvas before data loads.
1751 var points
= this.layout_
.points
;
1752 if (points
=== undefined
|| points
=== null) return;
1754 var canvasCoords
= this.eventToDomCoords(event
);
1755 var canvasx
= canvasCoords
[0];
1756 var canvasy
= canvasCoords
[1];
1758 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1759 var selectionChanged
= false;
1760 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1762 if (this.attr_("stackedGraph")) {
1763 closest
= this.findStackedPoint(canvasx
, canvasy
);
1765 closest
= this.findClosestPoint(canvasx
, canvasy
);
1767 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1769 var idx
= this.findClosestRow(canvasx
);
1770 selectionChanged
= this.setSelection(idx
);
1773 var callback
= this.attr_("highlightCallback");
1774 if (callback
&& selectionChanged
) {
1775 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1780 * Fetch left offset from first defined boundaryIds record (see bug #236).
1783 Dygraph
.prototype.getLeftBoundary_
= function() {
1784 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1785 if (this.boundaryIds_
[i
] !== undefined
) {
1786 return this.boundaryIds_
[i
][0];
1793 * Transforms layout_.points index into data row number.
1794 * @param int layout_.points index
1795 * @return int row number, or -1 if none could be found.
1798 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1799 if (rowIdx
< 0) return -1;
1801 var boundary
= this.getLeftBoundary_();
1802 return boundary
+ rowIdx
;
1803 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1804 // var set = this.layout_.datasets[setIdx];
1805 // if (idx < set.length) {
1806 // return boundary + idx;
1808 // idx -= set.length;
1813 Dygraph
.prototype.animateSelection_
= function(direction
) {
1814 var totalSteps
= 10;
1816 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1817 if (this.animateId
=== undefined
) this.animateId
= 0;
1818 var start
= this.fadeLevel
;
1819 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1821 if (this.fadeLevel
) {
1822 this.updateSelection_(1.0);
1827 var thisId
= ++this.animateId
;
1829 Dygraph
.repeatAndCleanup(
1831 // ignore simultaneous animations
1832 if (that
.animateId
!= thisId
) return;
1834 that
.fadeLevel
+= direction
;
1835 if (that
.fadeLevel
=== 0) {
1836 that
.clearSelection();
1838 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1841 steps
, millis
, function() {});
1845 * Draw dots over the selectied points in the data series. This function
1846 * takes care of cleanup of previously-drawn dots.
1849 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1850 var defaultPrevented
= this.cascadeEvents_('select', {
1851 selectedX
: this.lastx_
,
1852 selectedPoints
: this.selPoints_
1854 // TODO(danvk): use defaultPrevented here?
1856 // Clear the previously drawn vertical, if there is one
1858 var ctx
= this.canvas_ctx_
;
1859 if (this.attr_('highlightSeriesOpts')) {
1860 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1861 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1863 // Activating background fade includes an animation effect for a gradual
1864 // fade. TODO(klausw): make this independently configurable if it causes
1865 // issues? Use a shared preference to control animations?
1866 var animateBackgroundFade
= true;
1867 if (animateBackgroundFade
) {
1868 if (opt_animFraction
=== undefined
) {
1869 // start a new animation
1870 this.animateSelection_(1);
1873 alpha
*= opt_animFraction
;
1875 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1876 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1879 // Redraw only the highlighted series in the interactive canvas (not the
1880 // static plot canvas, which is where series are usually drawn).
1881 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1882 } else if (this.previousVerticalX_
>= 0) {
1883 // Determine the maximum highlight circle size.
1884 var maxCircleSize
= 0;
1885 var labels
= this.attr_('labels');
1886 for (i
= 1; i
< labels
.length
; i
++) {
1887 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1888 if (r
> maxCircleSize
) maxCircleSize
= r
;
1890 var px
= this.previousVerticalX_
;
1891 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1892 2 * maxCircleSize
+ 2, this.height_
);
1895 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1896 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1899 if (this.selPoints_
.length
> 0) {
1900 // Draw colored circles over the center of each selected point
1901 var canvasx
= this.selPoints_
[0].canvasx
;
1903 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1904 var pt
= this.selPoints_
[i
];
1905 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1907 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1908 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1909 var color
= this.plotter_
.colors
[pt
.name
];
1911 callback
= Dygraph
.Circles
.DEFAULT
;
1913 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1914 ctx
.strokeStyle
= color
;
1915 ctx
.fillStyle
= color
;
1916 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1921 this.previousVerticalX_
= canvasx
;
1926 * Manually set the selected points and display information about them in the
1927 * legend. The selection can be cleared using clearSelection() and queried
1928 * using getSelection().
1929 * @param { Integer } row number that should be highlighted (i.e. appear with
1930 * hover dots on the chart). Set to false to clear any selection.
1931 * @param { seriesName } optional series name to highlight that series with the
1932 * the highlightSeriesOpts setting.
1933 * @param { locked } optional If true, keep seriesName selected when mousing
1934 * over the graph, disabling closest-series highlighting. Call clearSelection()
1937 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1938 // Extract the points we've selected
1939 this.selPoints_
= [];
1941 if (row
!== false) {
1942 row
-= this.getLeftBoundary_();
1945 var changed
= false;
1946 if (row
!== false && row
>= 0) {
1947 if (row
!= this.lastRow_
) changed
= true;
1948 this.lastRow_
= row
;
1949 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1950 var set
= this.layout_
.datasets
[setIdx
];
1951 if (row
< set
.length
) {
1952 var point
= this.layout_
.points
[setIdx
][row
];
1954 if (this.attr_("stackedGraph")) {
1955 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1958 if (point
.yval
!== null) this.selPoints_
.push(point
);
1962 if (this.lastRow_
>= 0) changed
= true;
1966 if (this.selPoints_
.length
) {
1967 this.lastx_
= this.selPoints_
[0].xval
;
1972 if (opt_seriesName
!== undefined
) {
1973 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1974 this.highlightSet_
= opt_seriesName
;
1977 if (opt_locked
!== undefined
) {
1978 this.lockedSet_
= opt_locked
;
1982 this.updateSelection_(undefined
);
1988 * The mouse has left the canvas. Clear out whatever artifacts remain
1989 * @param {Object} event the mouseout event from the browser.
1992 Dygraph
.prototype.mouseOut_
= function(event
) {
1993 if (this.attr_("unhighlightCallback")) {
1994 this.attr_("unhighlightCallback")(event
);
1997 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
1998 this.clearSelection();
2003 * Clears the current selection (i.e. points that were highlighted by moving
2004 * the mouse over the chart).
2006 Dygraph
.prototype.clearSelection
= function() {
2007 this.cascadeEvents_('deselect', {});
2009 this.lockedSet_
= false;
2010 // Get rid of the overlay data
2011 if (this.fadeLevel
) {
2012 this.animateSelection_(-1);
2015 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2017 this.selPoints_
= [];
2020 this.highlightSet_
= null;
2024 * Returns the number of the currently selected row. To get data for this row,
2025 * you can use the getValue method.
2026 * @return { Integer } row number, or -1 if nothing is selected
2028 Dygraph
.prototype.getSelection
= function() {
2029 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2033 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2034 var points
= this.layout_
.points
[setIdx
];
2035 for (var row
= 0; row
< points
.length
; row
++) {
2036 if (points
[row
].x
== this.selPoints_
[0].x
) {
2037 return row
+ this.getLeftBoundary_();
2045 * Returns the name of the currently-highlighted series.
2046 * Only available when the highlightSeriesOpts option is in use.
2048 Dygraph
.prototype.getHighlightSeries
= function() {
2049 return this.highlightSet_
;
2053 * Returns true if the currently-highlighted series was locked
2054 * via setSelection(..., seriesName, true).
2056 Dygraph
.prototype.isSeriesLocked
= function() {
2057 return this.lockedSet_
;
2061 * Fires when there's data available to be graphed.
2062 * @param {String} data Raw CSV data to be plotted
2065 Dygraph
.prototype.loadedEvent_
= function(data
) {
2066 this.rawData_
= this.parseCSV_(data
);
2071 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2074 Dygraph
.prototype.addXTicks_
= function() {
2075 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2077 if (this.dateWindow_
) {
2078 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2080 range
= this.fullXRange_();
2083 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2084 var xTicks
= xAxisOptionsView('ticker')(
2087 this.width_
, // TODO(danvk): should be area.width
2090 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2091 // console.log(msg);
2092 this.layout_
.setXTicks(xTicks
);
2097 * Computes the range of the data series (including confidence intervals).
2098 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2099 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2100 * @return [low, high]
2102 Dygraph
.prototype.extremeValues_
= function(series
) {
2103 var minY
= null, maxY
= null, j
, y
;
2105 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2107 // With custom bars, maxY is the max of the high values.
2108 for (j
= 0; j
< series
.length
; j
++) {
2109 y
= series
[j
][1][0];
2110 if (y
=== null || isNaN(y
)) continue;
2111 var low
= y
- series
[j
][1][1];
2112 var high
= y
+ series
[j
][1][2];
2113 if (low
> y
) low
= y
; // this can happen with custom bars,
2114 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2115 if (maxY
=== null || high
> maxY
) {
2118 if (minY
=== null || low
< minY
) {
2123 for (j
= 0; j
< series
.length
; j
++) {
2125 if (y
=== null || isNaN(y
)) continue;
2126 if (maxY
=== null || y
> maxY
) {
2129 if (minY
=== null || y
< minY
) {
2135 return [minY
, maxY
];
2140 * This function is called once when the chart's data is changed or the options
2141 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2142 * idea is that values derived from the chart's data can be computed here,
2143 * rather than every time the chart is drawn. This includes things like the
2144 * number of axes, rolling averages, etc.
2146 Dygraph
.prototype.predraw_
= function() {
2147 var start
= new Date();
2149 // TODO(danvk): move more computations out of drawGraph_ and into here.
2150 this.computeYAxes_();
2152 // Create a new plotter.
2153 if (this.plotter_
) {
2154 this.cascadeEvents_('clearChart');
2155 this.plotter_
.clear();
2157 this.plotter_
= new DygraphCanvasRenderer(this,
2162 // The roller sits in the bottom left corner of the chart. We don't know where
2163 // this will be until the options are available, so it's positioned here.
2164 this.createRollInterface_();
2166 this.cascadeEvents_('predraw');
2168 if (this.rangeSelector_
) {
2169 this.rangeSelector_
.renderStaticLayer();
2172 // Convert the raw data (a 2D array) into the internal format and compute
2173 // rolling averages.
2174 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2175 for (var i
= 1; i
< this.numColumns(); i
++) {
2176 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2177 var logScale
= this.attr_('logscale');
2178 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2179 series
= this.rollingAverage(series
, this.rollPeriod_
);
2180 this.rolledSeries_
.push(series
);
2183 // If the data or options have changed, then we'd better redraw.
2186 // This is used to determine whether to do various animations.
2187 var end
= new Date();
2188 this.drawingTimeMs_
= (end
- start
);
2192 * Loop over all fields and create datasets, calculating extreme y-values for
2193 * each series and extreme x-indices as we go.
2195 * dateWindow is passed in as an explicit parameter so that we can compute
2196 * extreme values "speculatively", i.e. without actually setting state on the
2199 * TODO(danvk): make this more of a true function
2200 * @return [ datasets, seriesExtremes, boundaryIds ]
2203 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2204 var boundaryIds
= [];
2205 var cumulative_y
= []; // For stacked series.
2207 var extremes
= {}; // series name -> [low, high]
2210 // Loop over the fields (series). Go from the last to the first,
2211 // because if they're stacked that's how we accumulate the values.
2212 var num_series
= rolledSeries
.length
- 1;
2213 for (i
= num_series
; i
>= 1; i
--) {
2214 if (!this.visibility()[i
- 1]) continue;
2216 // Note: this copy _is_ necessary at the moment.
2217 // If you remove it, it breaks zooming with error bars on.
2218 // TODO(danvk): investigate further & write a test for this.
2220 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2221 series
.push(rolledSeries
[i
][j
]);
2224 // Prune down to the desired range, if necessary (for zooming)
2225 // Because there can be lines going to points outside of the visible area,
2226 // we actually prune to visible points, plus one on either side.
2227 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2229 var low
= dateWindow
[0];
2230 var high
= dateWindow
[1];
2232 // TODO(danvk): do binary search instead of linear search.
2233 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2234 var firstIdx
= null, lastIdx
= null;
2235 for (k
= 0; k
< series
.length
; k
++) {
2236 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2239 if (series
[k
][0] <= high
) {
2243 if (firstIdx
=== null) firstIdx
= 0;
2244 if (firstIdx
> 0) firstIdx
--;
2245 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2246 if (lastIdx
< series
.length
- 1) lastIdx
++;
2247 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2248 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2249 pruned
.push(series
[k
]);
2253 boundaryIds
[i
-1] = [0, series
.length
-1];
2256 var seriesExtremes
= this.extremeValues_(series
);
2259 for (j
=0; j
<series
.length
; j
++) {
2260 series
[j
] = [series
[j
][0],
2265 } else if (this.attr_("stackedGraph")) {
2266 var l
= series
.length
;
2268 for (j
= 0; j
< l
; j
++) {
2269 // If one data set has a NaN, let all subsequent stacked
2270 // sets inherit the NaN -- only start at 0 for the first set.
2271 var x
= series
[j
][0];
2272 if (cumulative_y
[x
] === undefined
) {
2273 cumulative_y
[x
] = 0;
2276 actual_y
= series
[j
][1];
2277 if (actual_y
=== null) {
2278 series
[j
] = [x
, null];
2282 cumulative_y
[x
] += actual_y
;
2284 series
[j
] = [x
, cumulative_y
[x
]];
2286 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2287 seriesExtremes
[1] = cumulative_y
[x
];
2289 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2290 seriesExtremes
[0] = cumulative_y
[x
];
2295 var seriesName
= this.attr_("labels")[i
];
2296 extremes
[seriesName
] = seriesExtremes
;
2297 datasets
[i
] = series
;
2300 // For stacked graphs, a NaN value for any point in the sum should create a
2301 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2302 if (this.attr_("stackedGraph")) {
2303 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2304 // Use the first nonempty dataset to get X values.
2305 if (!datasets
[k
]) continue;
2306 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2307 var x
= datasets
[k
][j
][0];
2308 if (isNaN(cumulative_y
[x
])) {
2309 // Set all Y values to NaN at that X value.
2310 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2311 if (!datasets
[i
]) continue;
2312 datasets
[i
][j
][1] = NaN
;
2320 return [ datasets
, extremes
, boundaryIds
];
2324 * Update the graph with new data. This method is called when the viewing area
2325 * has changed. If the underlying data or options have changed, predraw_ will
2326 * be called before drawGraph_ is called.
2330 Dygraph
.prototype.drawGraph_
= function() {
2331 var start
= new Date();
2333 // This is used to set the second parameter to drawCallback, below.
2334 var is_initial_draw
= this.is_initial_draw_
;
2335 this.is_initial_draw_
= false;
2337 this.layout_
.removeAllDatasets();
2339 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2341 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2342 var datasets
= packed
[0];
2343 var extremes
= packed
[1];
2344 this.boundaryIds_
= packed
[2];
2346 this.setIndexByName_
= {};
2347 var labels
= this.attr_("labels");
2348 if (labels
.length
> 0) {
2349 this.setIndexByName_
[labels
[0]] = 0;
2352 for (var i
= 1; i
< datasets
.length
; i
++) {
2353 this.setIndexByName_
[labels
[i
]] = i
;
2354 if (!this.visibility()[i
- 1]) continue;
2355 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2356 this.datasetIndex_
[i
] = dataIdx
++;
2359 this.computeYAxisRanges_(extremes
);
2360 this.layout_
.setYAxes(this.axes_
);
2364 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2365 var tmp_zoomed_x
= this.zoomed_x_
;
2366 // Tell PlotKit to use this new data and render itself
2367 this.layout_
.setDateWindow(this.dateWindow_
);
2368 this.zoomed_x_
= tmp_zoomed_x
;
2369 this.layout_
.evaluateWithError();
2370 this.renderGraph_(is_initial_draw
);
2372 if (this.attr_("timingName")) {
2373 var end
= new Date();
2375 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2381 * This does the work of drawing the chart. It assumes that the layout and axis
2382 * scales have already been set (e.g. by predraw_).
2386 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2387 this.cascadeEvents_('clearChart');
2388 this.plotter_
.clear();
2390 if (this.attr_('underlayCallback')) {
2391 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2392 // users who expect a deprecated form of this callback.
2393 this.attr_('underlayCallback')(
2394 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2398 canvas
: this.hidden_
,
2399 drawingContext
: this.hidden_ctx_
2401 this.cascadeEvents_('willDrawChart', e
);
2402 this.plotter_
.render();
2403 this.cascadeEvents_('didDrawChart', e
);
2405 // TODO(danvk): is this a performance bottleneck when panning?
2406 // The interaction canvas should already be empty in that situation.
2407 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2408 this.canvas_
.height
);
2410 // Generate a static legend before any particular point is selected.
2412 if (this.rangeSelector_
) {
2413 this.rangeSelector_
.renderInteractiveLayer();
2415 if (this.attr_("drawCallback") !== null) {
2416 this.attr_("drawCallback")(this, is_initial_draw
);
2422 * Determine properties of the y-axes which are independent of the data
2423 * currently being displayed. This includes things like the number of axes and
2424 * the style of the axes. It does not include the range of each axis and its
2426 * This fills in this.axes_.
2427 * axes_ = [ { options } ]
2428 * indices are into the axes_ array.
2430 Dygraph
.prototype.computeYAxes_
= function() {
2431 // Preserve valueWindow settings if they exist, and if the user hasn't
2432 // specified a new valueRange.
2433 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2434 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2436 for (index
= 0; index
< this.axes_
.length
; index
++) {
2437 valueWindows
.push(this.axes_
[index
].valueWindow
);
2441 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2442 // data computation as well as options storage.
2443 // Go through once and add all the axes.
2446 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2447 // Add a new axis, making a copy of its per-axis options.
2448 opts
= { g
: this };
2449 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2450 this.axes_
[axis
] = opts
;
2453 if (valueWindows
!== undefined
) {
2454 // Restore valueWindow settings.
2455 for (index
= 0; index
< valueWindows
.length
; index
++) {
2456 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2460 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2462 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2463 v
= opts("valueRange");
2464 if (v
) this.axes_
[axis
].valueRange
= v
;
2465 } else { // To keep old behavior
2466 var axes
= this.user_attrs_
.axes
;
2467 if (axes
&& axes
.y2
) {
2468 v
= axes
.y2
.valueRange
;
2469 if (v
) this.axes_
[axis
].valueRange
= v
;
2476 * Returns the number of y-axes on the chart.
2477 * @return {Number} the number of axes.
2479 Dygraph
.prototype.numAxes
= function() {
2480 return this.attributes_
.numAxes();
2485 * Returns axis properties for the given series.
2486 * @param { String } setName The name of the series for which to get axis
2487 * properties, e.g. 'Y1'.
2488 * @return { Object } The axis properties.
2490 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2491 // TODO(danvk): handle errors.
2492 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2497 * Determine the value range and tick marks for each axis.
2498 * @param {Object} extremes A mapping from seriesName -> [low, high]
2499 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2501 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2503 var numAxes
= this.attributes_
.numAxes();
2505 // Compute extreme values, a span and tick marks for each axis.
2506 for (var i
= 0; i
< numAxes
; i
++) {
2507 var axis
= this.axes_
[i
];
2509 series
= this.attributes_
.seriesForAxis(i
);
2511 if (series
.length
== 0) {
2512 // If no series are defined or visible then use a reasonable default
2513 axis
.extremeRange
= [0, 1];
2515 // Calculate the extremes of extremes.
2516 var minY
= Infinity
; // extremes[series[0]][0];
2517 var maxY
= -Infinity
; // extremes[series[0]][1];
2518 var extremeMinY
, extremeMaxY
;
2520 for (var j
= 0; j
< series
.length
; j
++) {
2521 // this skips invisible series
2522 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2524 // Only use valid extremes to stop null data series' from corrupting the scale.
2525 extremeMinY
= extremes
[series
[j
]][0];
2526 if (extremeMinY
!== null) {
2527 minY
= Math
.min(extremeMinY
, minY
);
2529 extremeMaxY
= extremes
[series
[j
]][1];
2530 if (extremeMaxY
!== null) {
2531 maxY
= Math
.max(extremeMaxY
, maxY
);
2534 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2536 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2537 if (minY
== Infinity
) minY
= 0;
2538 if (maxY
== -Infinity
) maxY
= 1;
2540 // Add some padding and round up to an integer to be human-friendly.
2541 var span
= maxY
- minY
;
2542 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2543 if (span
=== 0) { span
= maxY
; }
2545 var maxAxisY
, minAxisY
;
2546 if (axis
.logscale
) {
2547 maxAxisY
= maxY
+ 0.1 * span
;
2550 maxAxisY
= maxY
+ 0.1 * span
;
2551 minAxisY
= minY
- 0.1 * span
;
2553 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2554 if (!this.attr_("avoidMinZero")) {
2555 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2556 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2559 if (this.attr_("includeZero")) {
2560 if (maxY
< 0) maxAxisY
= 0;
2561 if (minY
> 0) minAxisY
= 0;
2564 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2566 if (axis
.valueWindow
) {
2567 // This is only set if the user has zoomed on the y-axis. It is never set
2568 // by a user. It takes precedence over axis.valueRange because, if you set
2569 // valueRange, you'd still expect to be able to pan.
2570 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2571 } else if (axis
.valueRange
) {
2572 // This is a user-set value range for this axis.
2573 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2575 axis
.computedValueRange
= axis
.extremeRange
;
2578 // Add ticks. By default, all axes inherit the tick positions of the
2579 // primary axis. However, if an axis is specifically marked as having
2580 // independent ticks, then that is permissible as well.
2581 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2582 var ticker
= opts('ticker');
2583 if (i
=== 0 || axis
.independentTicks
) {
2584 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2585 axis
.computedValueRange
[1],
2586 this.height_
, // TODO(danvk): should be area.height
2590 var p_axis
= this.axes_
[0];
2591 var p_ticks
= p_axis
.ticks
;
2592 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2593 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2594 var tick_values
= [];
2595 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2596 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2597 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2598 tick_values
.push(y_val
);
2601 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2602 axis
.computedValueRange
[1],
2603 this.height_
, // TODO(danvk): should be area.height
2612 * Extracts one series from the raw data (a 2D array) into an array of (date,
2615 * This is where undesirable points (i.e. negative values on log scales and
2616 * missing values through which we wish to connect lines) are dropped.
2617 * TODO(danvk): the "missing values" bit above doesn't seem right.
2621 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2622 // TODO(danvk): pre-allocate series here.
2624 for (var j
= 0; j
< rawData
.length
; j
++) {
2625 var x
= rawData
[j
][0];
2626 var point
= rawData
[j
][i
];
2628 // On the log scale, points less than zero do not exist.
2629 // This will create a gap in the chart.
2634 series
.push([x
, point
]);
2641 * Calculates the rolling average of a data set.
2642 * If originalData is [label, val], rolls the average of those.
2643 * If originalData is [label, [, it's interpreted as [value, stddev]
2644 * and the roll is returned in the same form, with appropriately reduced
2645 * stddev for each value.
2646 * Note that this is where fractional input (i.e. '5/10') is converted into
2648 * @param {Array} originalData The data in the appropriate format (see above)
2649 * @param {Number} rollPeriod The number of points over which to average the
2652 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2653 if (originalData
.length
< 2)
2654 return originalData
;
2655 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2656 var rollingData
= [];
2657 var sigma
= this.attr_("sigma");
2659 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2660 if (this.fractions_
) {
2662 var den
= 0; // numerator/denominator
2664 for (i
= 0; i
< originalData
.length
; i
++) {
2665 num
+= originalData
[i
][1][0];
2666 den
+= originalData
[i
][1][1];
2667 if (i
- rollPeriod
>= 0) {
2668 num
-= originalData
[i
- rollPeriod
][1][0];
2669 den
-= originalData
[i
- rollPeriod
][1][1];
2672 var date
= originalData
[i
][0];
2673 var value
= den
? num
/ den
: 0.0;
2674 if (this.attr_("errorBars")) {
2675 if (this.attr_("wilsonInterval")) {
2676 // For more details on this confidence interval, see:
2677 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2679 var p
= value
< 0 ? 0 : value
, n
= den
;
2680 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2681 var denom
= 1 + sigma
* sigma
/ den
;
2682 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2683 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2684 rollingData
[i
] = [date
,
2685 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2687 rollingData
[i
] = [date
, [0, 0, 0]];
2690 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2691 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2694 rollingData
[i
] = [date
, mult
* value
];
2697 } else if (this.attr_("customBars")) {
2702 for (i
= 0; i
< originalData
.length
; i
++) {
2703 var data
= originalData
[i
][1];
2705 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2707 if (y
!== null && !isNaN(y
)) {
2713 if (i
- rollPeriod
>= 0) {
2714 var prev
= originalData
[i
- rollPeriod
];
2715 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2723 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2724 1.0 * (mid
- low
) / count
,
2725 1.0 * (high
- mid
) / count
]];
2727 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2731 // Calculate the rolling average for the first rollPeriod - 1 points where
2732 // there is not enough data to roll over the full number of points
2733 if (!this.attr_("errorBars")){
2734 if (rollPeriod
== 1) {
2735 return originalData
;
2738 for (i
= 0; i
< originalData
.length
; i
++) {
2741 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2742 y
= originalData
[j
][1];
2743 if (y
=== null || isNaN(y
)) continue;
2745 sum
+= originalData
[j
][1];
2748 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2750 rollingData
[i
] = [originalData
[i
][0], null];
2755 for (i
= 0; i
< originalData
.length
; i
++) {
2759 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2760 y
= originalData
[j
][1][0];
2761 if (y
=== null || isNaN(y
)) continue;
2763 sum
+= originalData
[j
][1][0];
2764 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2767 stddev
= Math
.sqrt(variance
) / num_ok
;
2768 rollingData
[i
] = [originalData
[i
][0],
2769 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2771 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2781 * Detects the type of the str (date or numeric) and sets the various
2782 * formatting attributes in this.attrs_ based on this type.
2783 * @param {String} str An x value.
2786 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2788 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2789 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2790 str
.indexOf('/') >= 0 ||
2791 isNaN(parseFloat(str
))) {
2793 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2794 // TODO(danvk): remove support for this format.
2799 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2800 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2801 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2802 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2804 /** @private (shut up, jsdoc!) */
2805 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2806 // TODO(danvk): use Dygraph.numberValueFormatter here?
2807 /** @private (shut up, jsdoc!) */
2808 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2809 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2810 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2815 * Parses the value as a floating point number. This is like the parseFloat()
2816 * built-in, but with a few differences:
2817 * - the empty string is parsed as null, rather than NaN.
2818 * - if the string cannot be parsed at all, an error is logged.
2819 * If the string can't be parsed, this method returns null.
2820 * @param {String} x The string to be parsed
2821 * @param {Number} opt_line_no The line number from which the string comes.
2822 * @param {String} opt_line The text of the line from which the string comes.
2826 // Parse the x as a float or return null if it's not a number.
2827 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2828 var val
= parseFloat(x
);
2829 if (!isNaN(val
)) return val
;
2831 // Try to figure out what happeend.
2832 // If the value is the empty string, parse it as null.
2833 if (/^ *$/.test(x
)) return null;
2835 // If it was actually "NaN", return it as NaN.
2836 if (/^ *nan *$/i.test(x
)) return NaN
;
2838 // Looks like a parsing error.
2839 var msg
= "Unable to parse '" + x
+ "' as a number";
2840 if (opt_line
!== null && opt_line_no
!== null) {
2841 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2850 * Parses a string in a special csv format. We expect a csv file where each
2851 * line is a date point, and the first field in each line is the date string.
2852 * We also expect that all remaining fields represent series.
2853 * if the errorBars attribute is set, then interpret the fields as:
2854 * date, series1, stddev1, series2, stddev2, ...
2855 * @param {[Object]} data See above.
2857 * @return [Object] An array with one entry for each row. These entries
2858 * are an array of cells in that row. The first entry is the parsed x-value for
2859 * the row. The second, third, etc. are the y-values. These can take on one of
2860 * three forms, depending on the CSV and constructor parameters:
2862 * 2. [ value, stddev ]
2863 * 3. [ low value, center value, high value ]
2865 Dygraph
.prototype.parseCSV_
= function(data
) {
2867 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2868 var lines
= data
.split(line_delimiter
|| "\n");
2871 // Use the default delimiter or fall back to a tab if that makes sense.
2872 var delim
= this.attr_('delimiter');
2873 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2878 if (!('labels' in this.user_attrs_
)) {
2879 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2881 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2882 this.attributes_
.reparseSeries();
2887 var defaultParserSet
= false; // attempt to auto-detect x value type
2888 var expectedCols
= this.attr_("labels").length
;
2889 var outOfOrder
= false;
2890 for (var i
= start
; i
< lines
.length
; i
++) {
2891 var line
= lines
[i
];
2893 if (line
.length
=== 0) continue; // skip blank lines
2894 if (line
[0] == '#') continue; // skip comment lines
2895 var inFields
= line
.split(delim
);
2896 if (inFields
.length
< 2) continue;
2899 if (!defaultParserSet
) {
2900 this.detectTypeFromString_(inFields
[0]);
2901 xParser
= this.attr_("xValueParser");
2902 defaultParserSet
= true;
2904 fields
[0] = xParser(inFields
[0], this);
2906 // If fractions are expected, parse the numbers as "A/B
"
2907 if (this.fractions_) {
2908 for (j = 1; j < inFields.length; j++) {
2909 // TODO(danvk): figure out an appropriate way to flag parse errors.
2910 vals = inFields[j].split("/");
2911 if (vals.length != 2) {
2912 this.error('Expected fractional "num
/den
" values in CSV data ' +
2913 "but found a value
'" + inFields[j] + "' on line
" +
2914 (1 + i) + " ('" + line + "') which is not of
this form
.");
2917 fields[j] = [this.parseFloat_(vals[0], i, line),
2918 this.parseFloat_(vals[1], i, line)];
2921 } else if (this.attr_("errorBars
")) {
2922 // If there are error bars, values are (value, stddev) pairs
2923 if (inFields.length % 2 != 1) {
2924 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2925 'but line ' + (1 + i) + ' has an odd number of values (' +
2926 (inFields.length - 1) + "): '" + line + "'");
2928 for (j = 1; j < inFields.length; j += 2) {
2929 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2930 this.parseFloat_(inFields[j + 1], i, line)];
2932 } else if (this.attr_("customBars
")) {
2933 // Bars are a low;center;high tuple
2934 for (j = 1; j < inFields.length; j++) {
2935 var val = inFields[j];
2936 if (/^ *$/.test(val)) {
2937 fields[j] = [null, null, null];
2939 vals = val.split(";");
2940 if (vals.length == 3) {
2941 fields[j] = [ this.parseFloat_(vals[0], i, line),
2942 this.parseFloat_(vals[1], i, line),
2943 this.parseFloat_(vals[2], i, line) ];
2945 this.warn('When using customBars, values must be either blank ' +
2946 'or "low
;center
;high
" tuples (got "' + val +
2947 '" on line ' + (1+i));
2952 // Values are just numbers
2953 for (j = 1; j < inFields.length; j++) {
2954 fields[j] = this.parseFloat_(inFields[j], i, line);
2957 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2961 if (fields.length != expectedCols) {
2962 this.error("Number of columns
in line
" + i + " (" + fields.length +
2963 ") does not agree
with number of
labels (" + expectedCols +
2967 // If the user specified the 'labels' option and none of the cells of the
2968 // first row parsed correctly, then they probably double-specified the
2969 // labels. We go with the values set in the option, discard this row and
2970 // log a warning to the JS console.
2971 if (i === 0 && this.attr_('labels')) {
2972 var all_null = true;
2973 for (j = 0; all_null && j < fields.length; j++) {
2974 if (fields[j]) all_null = false;
2977 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2978 "CSV
data ('" + line + "') appears to also contain labels
. " +
2979 "Will drop the CSV labels and
use the option labels
.");
2987 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2988 ret.sort(function(a,b) { return a[0] - b[0]; });
2996 * The user has provided their data as a pre-packaged JS array. If the x values
2997 * are numeric, this is the same as dygraphs' internal format. If the x values
2998 * are dates, we need to convert them from Date objects to ms since epoch.
2999 * @param {[Object]} data
3000 * @return {[Object]} data with numeric x values.
3002 Dygraph.prototype.parseArray_ = function(data) {
3003 // Peek at the first x value to see if it's numeric.
3004 if (data.length === 0) {
3005 this.error("Can
't plot empty data set");
3008 if (data[0].length === 0) {
3009 this.error("Data set cannot contain an empty row");
3014 if (this.attr_("labels") === null) {
3015 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3016 "in the options parameter");
3017 this.attrs_.labels = [ "X" ];
3018 for (i = 1; i < data[0].length; i++) {
3019 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3021 this.attributes_.reparseSeries();
3023 var num_labels = this.attr_("labels");
3024 if (num_labels.length != data[0].length) {
3025 this.error("Mismatch between number of labels (" + num_labels +
3026 ") and number of columns in array (" + data[0].length + ")");
3031 if (Dygraph.isDateLike(data[0][0])) {
3032 // Some intelligent defaults for a date x-axis.
3033 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3034 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3035 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3037 // Assume they're all dates
.
3038 var parsedData
= Dygraph
.clone(data
);
3039 for (i
= 0; i
< data
.length
; i
++) {
3040 if (parsedData
[i
].length
=== 0) {
3041 this.error("Row " + (1 + i
) + " of data is empty");
3044 if (parsedData
[i
][0] === null ||
3045 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3046 isNaN(parsedData
[i
][0].getTime())) {
3047 this.error("x value in row " + (1 + i
) + " is not a Date");
3050 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3054 // Some intelligent defaults for a numeric x-axis.
3055 /** @private (shut up, jsdoc!) */
3056 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3057 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3058 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3064 * Parses a DataTable object from gviz.
3065 * The data is expected to have a first column that is either a date or a
3066 * number. All subsequent columns must be numbers. If there is a clear mismatch
3067 * between this.xValueParser_ and the type of the first column, it will be
3068 * fixed. Fills out rawData_.
3069 * @param {[Object]} data See above.
3072 Dygraph
.prototype.parseDataTable_
= function(data
) {
3073 var shortTextForAnnotationNum
= function(num
) {
3074 // converts [0-9]+ [A-Z][a-z]*
3075 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3076 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3077 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3078 num
= Math
.floor(num
/ 26);
3080 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3081 num
= Math
.floor((num
- 1) / 26);
3086 var cols
= data
.getNumberOfColumns();
3087 var rows
= data
.getNumberOfRows();
3089 var indepType
= data
.getColumnType(0);
3090 if (indepType
== 'date' || indepType
== 'datetime') {
3091 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3092 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3093 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3094 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3095 } else if (indepType
== 'number') {
3096 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3097 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3098 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3099 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3101 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3102 "column 1 of DataTable input (Got '" + indepType
+ "')");
3106 // Array of the column indices which contain data (and not annotations).
3108 var annotationCols
= {}; // data index -> [annotation cols]
3109 var hasAnnotations
= false;
3111 for (i
= 1; i
< cols
; i
++) {
3112 var type
= data
.getColumnType(i
);
3113 if (type
== 'number') {
3115 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3116 // This is OK -- it's an annotation column.
3117 var dataIdx
= colIdx
[colIdx
.length
- 1];
3118 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3119 annotationCols
[dataIdx
] = [i
];
3121 annotationCols
[dataIdx
].push(i
);
3123 hasAnnotations
= true;
3125 this.error("Only 'number' is supported as a dependent type with Gviz." +
3126 " 'string' is only supported if displayAnnotations is true");
3130 // Read column labels
3131 // TODO(danvk): add support back for errorBars
3132 var labels
= [data
.getColumnLabel(0)];
3133 for (i
= 0; i
< colIdx
.length
; i
++) {
3134 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3135 if (this.attr_("errorBars")) i
+= 1;
3137 this.attrs_
.labels
= labels
;
3138 cols
= labels
.length
;
3141 var outOfOrder
= false;
3142 var annotations
= [];
3143 for (i
= 0; i
< rows
; i
++) {
3145 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3146 data
.getValue(i
, 0) === null) {
3147 this.warn("Ignoring row " + i
+
3148 " of DataTable because of undefined or null first column.");
3152 if (indepType
== 'date' || indepType
== 'datetime') {
3153 row
.push(data
.getValue(i
, 0).getTime());
3155 row
.push(data
.getValue(i
, 0));
3157 if (!this.attr_("errorBars")) {
3158 for (j
= 0; j
< colIdx
.length
; j
++) {
3159 var col
= colIdx
[j
];
3160 row
.push(data
.getValue(i
, col
));
3161 if (hasAnnotations
&&
3162 annotationCols
.hasOwnProperty(col
) &&
3163 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3165 ann
.series
= data
.getColumnLabel(col
);
3167 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3169 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3170 if (k
) ann
.text
+= "\n";
3171 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3173 annotations
.push(ann
);
3177 // Strip out infinities, which give dygraphs problems later on.
3178 for (j
= 0; j
< row
.length
; j
++) {
3179 if (!isFinite(row
[j
])) row
[j
] = null;
3182 for (j
= 0; j
< cols
- 1; j
++) {
3183 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3186 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3193 this.warn("DataTable is out of order; order it correctly to speed loading.");
3194 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3196 this.rawData_
= ret
;
3198 if (annotations
.length
> 0) {
3199 this.setAnnotations(annotations
, true);
3204 * Get the CSV data. If it's in a function, call that function. If it's in a
3205 * file, do an XMLHttpRequest to get it.
3208 Dygraph
.prototype.start_
= function() {
3209 var data
= this.file_
;
3211 // Functions can return references of all other types.
3212 if (typeof data
== 'function') {
3216 if (Dygraph
.isArrayLike(data
)) {
3217 this.rawData_
= this.parseArray_(data
);
3219 } else if (typeof data
== 'object' &&
3220 typeof data
.getColumnRange
== 'function') {
3221 // must be a DataTable from gviz.
3222 this.parseDataTable_(data
);
3224 } else if (typeof data
== 'string') {
3225 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3226 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3227 if (line_delimiter
) {
3228 this.loadedEvent_(data
);
3230 var req
= new XMLHttpRequest();
3232 req
.onreadystatechange
= function () {
3233 if (req
.readyState
== 4) {
3234 if (req
.status
=== 200 || // Normal http
3235 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3236 caller
.loadedEvent_(req
.responseText
);
3241 req
.open("GET", data
, true);
3245 this.error("Unknown data format: " + (typeof data
));
3250 * Changes various properties of the graph. These can include:
3252 * <li>file: changes the source data for the graph</li>
3253 * <li>errorBars: changes whether the data contains stddev</li>
3256 * There's a huge variety of options that can be passed to this method. For a
3257 * full list, see http://dygraphs.com/options.html.
3259 * @param {Object} attrs The new properties and values
3260 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3261 * call to updateOptions(). If you know better, you can pass true to explicitly
3262 * block the redraw. This can be useful for chaining updateOptions() calls,
3263 * avoiding the occasional infinite loop and preventing redraws when it's not
3264 * necessary (e.g. when updating a callback).
3266 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3267 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3269 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3270 var file
= input_attrs
.file
;
3271 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3273 // TODO(danvk): this is a mess. Move these options into attr_.
3274 if ('rollPeriod' in attrs
) {
3275 this.rollPeriod_
= attrs
.rollPeriod
;
3277 if ('dateWindow' in attrs
) {
3278 this.dateWindow_
= attrs
.dateWindow
;
3279 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3280 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3283 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3284 this.zoomed_y_
= (attrs
.valueRange
!== null);
3287 // TODO(danvk): validate per-series options.
3292 // highlightCircleSize
3294 // Check if this set options will require new points.
3295 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3297 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3299 this.attributes_
.reparseSeries();
3303 if (!block_redraw
) this.start_();
3305 if (!block_redraw
) {
3306 if (requiresNewPoints
) {
3309 this.renderGraph_(false);
3316 * Returns a copy of the options with deprecated names converted into current
3317 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3318 * interested in that, they should save a copy before calling this.
3321 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3323 for (var k
in attrs
) {
3324 if (k
== 'file') continue;
3325 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3328 var set
= function(axis
, opt
, value
) {
3329 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3330 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3331 my_attrs
.axes
[axis
][opt
] = value
;
3333 var map
= function(opt
, axis
, new_opt
) {
3334 if (typeof(attrs
[opt
]) != 'undefined') {
3335 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3336 new_opt
+ " option for the " + axis
+ " axis instead. " +
3337 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3338 "(see http://dygraphs.com/per-axis.html for more information.");
3339 set(axis
, new_opt
, attrs
[opt
]);
3340 delete my_attrs
[opt
];
3344 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3345 map('xValueFormatter', 'x', 'valueFormatter');
3346 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3347 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3348 map('xTicker', 'x', 'ticker');
3349 map('yValueFormatter', 'y', 'valueFormatter');
3350 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3351 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3352 map('yTicker', 'y', 'ticker');
3357 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3358 * containing div (which has presumably changed size since the dygraph was
3359 * instantiated. If the width/height are specified, the div will be resized.
3361 * This is far more efficient than destroying and re-instantiating a
3362 * Dygraph, since it doesn't have to reparse the underlying data.
3364 * @param {Number} [width] Width (in pixels)
3365 * @param {Number} [height] Height (in pixels)
3367 Dygraph
.prototype.resize
= function(width
, height
) {
3368 if (this.resize_lock
) {
3371 this.resize_lock
= true;
3373 if ((width
=== null) != (height
=== null)) {
3374 this.warn("Dygraph.resize() should be called with zero parameters or " +
3375 "two non-NULL parameters. Pretending it was zero.");
3376 width
= height
= null;
3379 var old_width
= this.width_
;
3380 var old_height
= this.height_
;
3383 this.maindiv_
.style
.width
= width
+ "px";
3384 this.maindiv_
.style
.height
= height
+ "px";
3385 this.width_
= width
;
3386 this.height_
= height
;
3388 this.width_
= this.maindiv_
.clientWidth
;
3389 this.height_
= this.maindiv_
.clientHeight
;
3392 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3393 // TODO(danvk): there should be a clear() method.
3394 this.maindiv_
.innerHTML
= "";
3395 this.roller_
= null;
3396 this.attrs_
.labelsDiv
= null;
3397 this.createInterface_();
3398 if (this.annotations_
.length
) {
3399 // createInterface_ reset the layout, so we need to do this.
3400 this.layout_
.setAnnotations(this.annotations_
);
3405 this.resize_lock
= false;
3409 * Adjusts the number of points in the rolling average. Updates the graph to
3410 * reflect the new averaging period.
3411 * @param {Number} length Number of points over which to average the data.
3413 Dygraph
.prototype.adjustRoll
= function(length
) {
3414 this.rollPeriod_
= length
;
3419 * Returns a boolean array of visibility statuses.
3421 Dygraph
.prototype.visibility
= function() {
3422 // Do lazy-initialization, so that this happens after we know the number of
3424 if (!this.attr_("visibility")) {
3425 this.attrs_
.visibility
= [];
3427 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3428 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3429 this.attrs_
.visibility
.push(true);
3431 return this.attr_("visibility");
3435 * Changes the visiblity of a series.
3437 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3438 var x
= this.visibility();
3439 if (num
< 0 || num
>= x
.length
) {
3440 this.warn("invalid series number in setVisibility: " + num
);
3448 * How large of an area will the dygraph render itself in?
3449 * This is used for testing.
3450 * @return A {width: w, height: h} object.
3453 Dygraph
.prototype.size
= function() {
3454 return { width
: this.width_
, height
: this.height_
};
3458 * Update the list of annotations and redraw the chart.
3459 * See dygraphs.com/annotations.html for more info on how to use annotations.
3460 * @param ann {Array} An array of annotation objects.
3461 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3463 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3464 // Only add the annotation CSS rule once we know it will be used.
3465 Dygraph
.addAnnotationRule();
3466 this.annotations_
= ann
;
3467 this.layout_
.setAnnotations(this.annotations_
);
3468 if (!suppressDraw
) {
3474 * Return the list of annotations.
3476 Dygraph
.prototype.annotations
= function() {
3477 return this.annotations_
;
3481 * Get the list of label names for this graph. The first column is the
3482 * x-axis, so the data series names start at index 1.
3484 Dygraph
.prototype.getLabels
= function() {
3485 return this.attr_("labels").slice();
3489 * Get the index of a series (column) given its name. The first column is the
3490 * x-axis, so the data series start with index 1.
3492 Dygraph
.prototype.indexFromSetName
= function(name
) {
3493 return this.setIndexByName_
[name
];
3497 * Get the internal dataset index given its name. These are numbered starting from 0,
3498 * and only count visible sets.
3501 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3502 return this.datasetIndex_
[this.indexFromSetName(name
)];
3507 * Adds a default style for the annotation CSS classes to the document. This is
3508 * only executed when annotations are actually used. It is designed to only be
3509 * called once -- all calls after the first will return immediately.
3511 Dygraph
.addAnnotationRule
= function() {
3512 // TODO(danvk): move this function into plugins/annotations.js
?
3513 if (Dygraph
.addedAnnotationCSS
) return;
3515 var rule
= "border: 1px solid black; " +
3516 "background-color: white; " +
3517 "text-align: center;";
3519 var styleSheetElement
= document
.createElement("style");
3520 styleSheetElement
.type
= "text/css";
3521 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3523 // Find the first style sheet that we can access.
3524 // We may not add a rule to a style sheet from another domain for security
3525 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3526 // adds its own style sheets from google.com.
3527 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3528 if (document
.styleSheets
[i
].disabled
) continue;
3529 var mysheet
= document
.styleSheets
[i
];
3531 if (mysheet
.insertRule
) { // Firefox
3532 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3533 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3534 } else if (mysheet
.addRule
) { // IE
3535 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3537 Dygraph
.addedAnnotationCSS
= true;
3540 // Was likely a security exception.
3544 this.warn("Unable to add default annotation CSS rule; display may be off.");
3547 // Older pages may still use this name.
3548 var DateGraph
= Dygraph
;