3 * Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
8 * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
9 * string. Dygraph can handle multiple series with or without error bars. The
10 * date/value ranges will be automatically set. Dygraph uses the
11 * <canvas> tag, so it only works in FF1.5+.
12 * @author danvdk@gmail.com (Dan Vanderkam)
15 <div id="graphdiv" style="width:800px; height:500px;"></div>
16 <script type="text/javascript">
17 new Dygraph(document.getElementById("graphdiv"),
18 "datafile.csv", // CSV file with headers
22 The CSV file is of the form
24 Date,SeriesA,SeriesB,SeriesC
28 If the 'errorBars' option is set in the constructor, the input should be of
30 Date,SeriesA,SeriesB,...
31 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
32 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
34 If the 'fractions' option is set, the input should be of the form:
36 Date,SeriesA,SeriesB,...
37 YYYYMMDD,A1/B1,A2/B2,...
38 YYYYMMDD,A1/B1,A2/B2,...
40 And error bars will be calculated automatically using a binomial distribution.
42 For further documentation and examples, see http://dygraphs.com/
46 /*jshint globalstrict: true */
47 /*global DygraphRangeSelector:false, DygraphLayout:false, DygraphCanvasRenderer:false, G_vmlCanvasManager:false */
51 * Creates an interactive, zoomable chart.
54 * @param {div | String} div A div or the id of a div into which to construct
56 * @param {String | Function} file A file containing CSV data or a function
57 * that returns this data. The most basic expected format for each line is
58 * "YYYY/MM/DD,val1,val2,...". For more information, see
59 * http://dygraphs.com/data.html.
60 * @param {Object} attrs Various other attributes, e.g. errorBars determines
61 * whether the input data contains error ranges. For a complete list of
62 * options, see http://dygraphs.com/options.html.
64 var Dygraph
= function(div
, data
, opts
, opt_fourth_param
) {
65 if (opt_fourth_param
!== undefined
) {
66 // Old versions of dygraphs took in the series labels as a constructor
67 // parameter. This doesn't make sense anymore, but it's easy to continue
68 // to support this usage.
69 this.warn("Using deprecated four-argument dygraph constructor");
70 this.__old_init__(div
, data
, opts
, opt_fourth_param
);
72 this.__init__(div
, data
, opts
);
76 Dygraph
.NAME
= "Dygraph";
77 Dygraph
.VERSION
= "1.2";
78 Dygraph
.__repr__
= function() {
79 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
83 * Returns information about the Dygraph class.
85 Dygraph
.toString
= function() {
86 return this.__repr__();
89 // Various default values
90 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
91 Dygraph
.DEFAULT_WIDTH
= 480;
92 Dygraph
.DEFAULT_HEIGHT
= 320;
94 Dygraph
.ANIMATION_STEPS
= 10;
95 Dygraph
.ANIMATION_DURATION
= 200;
97 // These are defined before DEFAULT_ATTRS so that it can refer to them.
100 * Return a string version of a number. This respects the digitsAfterDecimal
101 * and maxNumberWidth options.
102 * @param {Number} x The number to be formatted
103 * @param {Dygraph} opts An options view
104 * @param {String} name The name of the point's data series
105 * @param {Dygraph} g The dygraph object
107 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
108 var sigFigs
= opts('sigFigs');
110 if (sigFigs
!== null) {
111 // User has opted for a fixed number of significant figures.
112 return Dygraph
.floatFormat(x
, sigFigs
);
115 var digits
= opts('digitsAfterDecimal');
116 var maxNumberWidth
= opts('maxNumberWidth');
118 // switch to scientific notation if we underflow or overflow fixed display.
120 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
121 Math
.abs(x
) < Math
.pow(10, -digits
))) {
122 return x
.toExponential(digits
);
124 return '' + Dygraph
.round_(x
, digits
);
129 * variant for use as an axisLabelFormatter.
132 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
133 return Dygraph
.numberValueFormatter(x
, opts
, g
);
137 * Convert a JS date (millis since epoch) to YYYY/MM/DD
138 * @param {Number} date The JavaScript date (ms since epoch)
139 * @return {String} A date of the form "YYYY/MM/DD"
142 Dygraph
.dateString_
= function(date
) {
143 var zeropad
= Dygraph
.zeropad
;
144 var d
= new Date(date
);
147 var year
= "" + d
.getFullYear();
148 // Get a 0 padded month string
149 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
150 // Get a 0 padded day string
151 var day
= zeropad(d
.getDate());
154 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
155 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
157 return year
+ "/" + month + "/" + day
+ ret
;
161 * Convert a JS date to a string appropriate to display on an axis that
162 * is displaying values at the stated granularity.
163 * @param {Date} date The date to format
164 * @param {Number} granularity One of the Dygraph granularity constants
165 * @return {String} The formatted date
168 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
169 if (granularity
>= Dygraph
.DECADAL
) {
170 return date
.strftime('%Y');
171 } else if (granularity
>= Dygraph
.MONTHLY
) {
172 return date
.strftime('%b %y');
174 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
175 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
176 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
178 return Dygraph
.hmsString_(date
.getTime());
184 // Default attribute values.
185 Dygraph
.DEFAULT_ATTRS
= {
186 highlightCircleSize
: 3,
187 highlightSeriesOpts
: null,
188 highlightSeriesBackgroundAlpha
: 0.5,
192 // TODO(danvk): move defaults from createStatusMessage_ here.
194 labelsSeparateLines
: false,
195 labelsShowZeroValues
: true,
198 showLabelsOnHighlight
: true,
200 digitsAfterDecimal
: 2,
205 strokeBorderWidth
: 0,
206 strokeBorderColor
: "white",
209 axisLabelFontSize
: 14,
215 xValueParser
: Dygraph
.dateParser
,
222 wilsonInterval
: true, // only relevant if fractions is true
226 connectSeparatedPoints
: false,
229 hideOverlayOnMouseOut
: true,
231 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
232 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
236 drawAxesAtZero
: false,
238 // Sizes of the various chart labels.
245 axisLineColor
: "black",
248 axisLabelColor
: "black",
249 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
253 gridLineColor
: "rgb(128,128,128)",
255 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
256 animatedZooms
: false, // (for now)
258 // Range selector options
259 showRangeSelector
: false,
260 rangeSelectorHeight
: 40,
261 rangeSelectorPlotStrokeColor
: "#808FAB",
262 rangeSelectorPlotFillColor
: "#A7B1C4",
268 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
269 valueFormatter
: Dygraph
.dateString_
,
270 ticker
: null // will be set in dygraph-tickers.js
274 valueFormatter
: Dygraph
.numberValueFormatter
,
275 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
276 ticker
: null // will be set in dygraph-tickers.js
280 valueFormatter
: Dygraph
.numberValueFormatter
,
281 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
282 ticker
: null // will be set in dygraph-tickers.js
287 // Directions for panning and zooming. Use bit operations when combined
288 // values are possible.
289 Dygraph
.HORIZONTAL
= 1;
290 Dygraph
.VERTICAL
= 2;
292 // Installed plugins, in order of precedence (most-general to most-specific).
293 // Plugins are installed after they are defined, in plugins/install.js
.
297 // Used for initializing annotation CSS rules only once.
298 Dygraph
.addedAnnotationCSS
= false;
300 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
301 // Labels is no longer a constructor parameter, since it's typically set
302 // directly from the data source. It also conains a name for the x-axis,
303 // which the previous constructor form did not.
304 if (labels
!== null) {
305 var new_labels
= ["Date"];
306 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
307 Dygraph
.update(attrs
, { 'labels': new_labels
});
309 this.__init__(div
, file
, attrs
);
313 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
314 * and context <canvas> inside of it. See the constructor for details.
316 * @param {Element} div the Element to render the graph into.
317 * @param {String | Function} file Source data
318 * @param {Object} attrs Miscellaneous other options
321 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
322 // Hack for IE: if we're using excanvas and the document hasn't finished
323 // loading yet (and hence may not have initialized whatever it needs to
324 // initialize), then keep calling this routine periodically until it has.
325 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
326 typeof(G_vmlCanvasManager
) != 'undefined' &&
327 document
.readyState
!= 'complete') {
329 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
333 // Support two-argument constructor
334 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
336 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
339 Dygraph
.error("Constructing dygraph with a non-existent div!");
343 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
345 // Copy the important bits into the object
346 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
349 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
350 this.previousVerticalX_
= -1;
351 this.fractions_
= attrs
.fractions
|| false;
352 this.dateWindow_
= attrs
.dateWindow
|| null;
354 this.is_initial_draw_
= true;
355 this.annotations_
= [];
357 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
358 this.zoomed_x_
= false;
359 this.zoomed_y_
= false;
361 // Clear the div. This ensure that, if multiple dygraphs are passed the same
362 // div, then only one will be drawn.
365 // For historical reasons, the 'width' and 'height' options trump all CSS
366 // rules _except_ for an explicit 'width' or 'height' on the div.
367 // As an added convenience, if the div has zero height (like <div></div> does
368 // without any styles), then we use a default height/width
.
369 if (div
.style
.width
=== '' && attrs
.width
) {
370 div
.style
.width
= attrs
.width
+ "px";
372 if (div
.style
.height
=== '' && attrs
.height
) {
373 div
.style
.height
= attrs
.height
+ "px";
375 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
376 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
377 if (div
.style
.width
=== '') {
378 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
381 // these will be zero if the dygraph's div is hidden.
382 this.width_
= div
.clientWidth
;
383 this.height_
= div
.clientHeight
;
385 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
386 if (attrs
.stackedGraph
) {
387 attrs
.fillGraph
= true;
388 // TODO(nikhilk): Add any other stackedGraph checks here.
391 // Dygraphs has many options, some of which interact with one another.
392 // To keep track of everything, we maintain two sets of options:
394 // this.user_attrs_ only options explicitly set by the user.
395 // this.attrs_ defaults, options derived from user_attrs_, data.
397 // Options are then accessed this.attr_('attr'), which first looks at
398 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
399 // defaults without overriding behavior that the user specifically asks for.
400 this.user_attrs_
= {};
401 Dygraph
.update(this.user_attrs_
, attrs
);
403 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
405 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
407 this.boundaryIds_
= [];
408 this.setIndexByName_
= {};
409 this.datasetIndex_
= [];
411 this.registeredEvents_
= [];
412 this.eventListeners_
= {};
414 // Create the containing DIV and other interactive elements
415 this.createInterface_();
419 for (var i
= 0; i
< Dygraph
.PLUGINS
.length
; i
++) {
420 var plugin
= Dygraph
.PLUGINS
[i
];
421 var pluginInstance
= new plugin();
423 plugin
: pluginInstance
,
429 var handlers
= pluginInstance
.activate(this);
430 for (var eventName
in handlers
) {
431 // TODO(danvk): validate eventName.
432 pluginDict
.events
[eventName
] = handlers
[eventName
];
435 this.plugins_
.push(pluginDict
);
438 // At this point, plugins can no longer register event handlers.
439 // Construct a map from event -> ordered list of [callback, plugin].
440 for (var i
= 0; i
< this.plugins_
.length
; i
++) {
441 var plugin_dict
= this.plugins_
[i
];
442 for (var eventName
in plugin_dict
.events
) {
443 if (!plugin_dict
.events
.hasOwnProperty(eventName
)) continue;
444 var callback
= plugin_dict
.events
[eventName
];
446 var pair
= [plugin_dict
.plugin
, callback
];
447 if (!(eventName
in this.eventListeners_
)) {
448 this.eventListeners_
[eventName
] = [pair
];
450 this.eventListeners_
[eventName
].push(pair
);
459 * Triggers a cascade of events to the various plugins which are interested in them.
460 * Returns true if the "default behavior" should be performed, i.e. if none of
461 * the event listeners called event.preventDefault().
464 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
465 if (!name
in this.eventListeners_
) return true;
467 // QUESTION: can we use objects & prototypes to speed this up?
471 defaultPrevented
: false,
472 preventDefault
: function() {
473 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
474 e
.defaultPrevented
= true;
476 propagationStopped
: false,
477 stopPropagation
: function() {
478 e
.propagationStopped
= true;
481 Dygraph
.update(e
, extra_props
);
483 var callback_plugin_pairs
= this.eventListeners_
[name
];
484 if (callback_plugin_pairs
) {
485 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
486 var plugin
= callback_plugin_pairs
[i
][0];
487 var callback
= callback_plugin_pairs
[i
][1];
488 callback
.call(plugin
, e
);
489 if (e
.propagationStopped
) break;
492 return e
.defaultPrevented
;
496 * Returns the zoomed status of the chart for one or both axes.
498 * Axis is an optional parameter. Can be set to 'x' or 'y'.
500 * The zoomed status for an axis is set whenever a user zooms using the mouse
501 * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom
502 * option is also specified).
504 Dygraph
.prototype.isZoomed
= function(axis
) {
505 if (axis
== null) return this.zoomed_x_
|| this.zoomed_y_
;
506 if (axis
=== 'x') return this.zoomed_x_
;
507 if (axis
=== 'y') return this.zoomed_y_
;
508 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
512 * Returns information about the Dygraph object, including its containing ID.
514 Dygraph
.prototype.toString
= function() {
515 var maindiv
= this.maindiv_
;
516 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
517 return "[Dygraph " + id
+ "]";
522 * Returns the value of an option. This may be set by the user (either in the
523 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
525 * @param { String } name The name of the option, e.g. 'rollPeriod'.
526 * @param { String } [seriesName] The name of the series to which the option
527 * will be applied. If no per-series value of this option is available, then
528 * the global value is returned. This is optional.
529 * @return { ... } The value of the option.
531 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
532 // <REMOVE_FOR_COMBINED>
533 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
534 this.error('Must include options reference JS for testing');
535 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
536 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
537 'in the Dygraphs.OPTIONS_REFERENCE listing.');
538 // Only log this error once.
539 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
541 // </REMOVE_FOR_COMBINED
>
544 sources
.push(this.attrs_
);
545 if (this.user_attrs_
) {
546 sources
.push(this.user_attrs_
);
548 if (this.user_attrs_
.hasOwnProperty(seriesName
)) {
549 sources
.push(this.user_attrs_
[seriesName
]);
551 if (seriesName
=== this.highlightSet_
&&
552 this.user_attrs_
.hasOwnProperty('highlightSeriesOpts')) {
553 sources
.push(this.user_attrs_
['highlightSeriesOpts']);
559 for (var i
= sources
.length
- 1; i
>= 0; --i
) {
560 var source
= sources
[i
];
561 if (source
.hasOwnProperty(name
)) {
570 * Returns the current value for an option, as set in the constructor or via
571 * updateOptions. You may pass in an (optional) series name to get per-series
572 * values for the option.
574 * All values returned by this method should be considered immutable. If you
575 * modify them, there is no guarantee that the changes will be honored or that
576 * dygraphs will remain in a consistent state. If you want to modify an option,
577 * use updateOptions() instead.
579 * @param { String } name The name of the option (e.g. 'strokeWidth')
580 * @param { String } [opt_seriesName] Series name to get per-series values.
581 * @return { ... } The value of the option.
583 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
584 return this.attr_(name
, opt_seriesName
);
589 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
590 * @return { ... } A function mapping string -> option value
592 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
594 return function(opt
) {
595 var axis_opts
= self
.user_attrs_
.axes
;
596 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
597 return axis_opts
[axis
][opt
];
599 // user-specified attributes always trump defaults, even if they're less
601 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
602 return self
.user_attrs_
[opt
];
605 axis_opts
= self
.attrs_
.axes
;
606 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
607 return axis_opts
[axis
][opt
];
609 // check old-style axis options
610 // TODO(danvk): add a deprecation warning if either of these match.
611 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
612 return self
.axes_
[0][opt
];
613 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
614 return self
.axes_
[1][opt
];
616 return self
.attr_(opt
);
621 * Returns the current rolling period, as set by the user or an option.
622 * @return {Number} The number of points in the rolling window
624 Dygraph
.prototype.rollPeriod
= function() {
625 return this.rollPeriod_
;
629 * Returns the currently-visible x-range. This can be affected by zooming,
630 * panning or a call to updateOptions.
631 * Returns a two-element array: [left, right].
632 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
634 Dygraph
.prototype.xAxisRange
= function() {
635 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
639 * Returns the lower- and upper-bound x-axis values of the
642 Dygraph
.prototype.xAxisExtremes
= function() {
643 var left
= this.rawData_
[0][0];
644 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
645 return [left
, right
];
649 * Returns the currently-visible y-range for an axis. This can be affected by
650 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
651 * called with no arguments, returns the range of the first axis.
652 * Returns a two-element array: [bottom, top].
654 Dygraph
.prototype.yAxisRange
= function(idx
) {
655 if (typeof(idx
) == "undefined") idx
= 0;
656 if (idx
< 0 || idx
>= this.axes_
.length
) {
659 var axis
= this.axes_
[idx
];
660 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
664 * Returns the currently-visible y-ranges for each axis. This can be affected by
665 * zooming, panning, calls to updateOptions, etc.
666 * Returns an array of [bottom, top] pairs, one for each y-axis.
668 Dygraph
.prototype.yAxisRanges
= function() {
670 for (var i
= 0; i
< this.axes_
.length
; i
++) {
671 ret
.push(this.yAxisRange(i
));
676 // TODO(danvk): use these functions throughout dygraphs.
678 * Convert from data coordinates to canvas/div X/Y coordinates.
679 * If specified, do this conversion for the coordinate system of a particular
680 * axis. Uses the first axis by default.
681 * Returns a two-element array: [X, Y]
683 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
684 * instead of toDomCoords(null, y, axis).
686 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
687 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
691 * Convert from data x coordinates to canvas/div X coordinate.
692 * If specified, do this conversion for the coordinate system of a particular
694 * Returns a single value or null if x is null.
696 Dygraph
.prototype.toDomXCoord
= function(x
) {
701 var area
= this.plotter_
.area
;
702 var xRange
= this.xAxisRange();
703 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
707 * Convert from data x coordinates to canvas/div Y coordinate and optional
708 * axis. Uses the first axis by default.
710 * returns a single value or null if y is null.
712 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
713 var pct
= this.toPercentYCoord(y
, axis
);
718 var area
= this.plotter_
.area
;
719 return area
.y
+ pct
* area
.h
;
723 * Convert from canvas/div coords to data coordinates.
724 * If specified, do this conversion for the coordinate system of a particular
725 * axis. Uses the first axis by default.
726 * Returns a two-element array: [X, Y].
728 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
729 * instead of toDataCoords(null, y, axis).
731 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
732 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
736 * Convert from canvas/div x coordinate to data coordinate.
738 * If x is null, this returns null.
740 Dygraph
.prototype.toDataXCoord
= function(x
) {
745 var area
= this.plotter_
.area
;
746 var xRange
= this.xAxisRange();
747 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
751 * Convert from canvas/div y coord to value.
753 * If y is null, this returns null.
754 * if axis is null, this uses the first axis.
756 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
761 var area
= this.plotter_
.area
;
762 var yRange
= this.yAxisRange(axis
);
764 if (typeof(axis
) == "undefined") axis
= 0;
765 if (!this.axes_
[axis
].logscale
) {
766 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
768 // Computing the inverse of toDomCoord.
769 var pct
= (y
- area
.y
) / area
.h
;
771 // Computing the inverse of toPercentYCoord. The function was arrived at with
772 // the following steps:
774 // Original calcuation:
775 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
777 // Move denominator to both sides:
778 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
780 // subtract logr1, and take the negative value.
781 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
783 // Swap both sides of the equation, and we can compute the log of the
784 // return value. Which means we just need to use that as the exponent in
786 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
788 var logr1
= Dygraph
.log10(yRange
[1]);
789 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
790 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
796 * Converts a y for an axis to a percentage from the top to the
797 * bottom of the drawing area.
799 * If the coordinate represents a value visible on the canvas, then
800 * the value will be between 0 and 1, where 0 is the top of the canvas.
801 * However, this method will return values outside the range, as
802 * values can fall outside the canvas.
804 * If y is null, this returns null.
805 * if axis is null, this uses the first axis.
807 * @param { Number } y The data y-coordinate.
808 * @param { Number } [axis] The axis number on which the data coordinate lives.
809 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
811 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
815 if (typeof(axis
) == "undefined") axis
= 0;
817 var yRange
= this.yAxisRange(axis
);
820 if (!this.axes_
[axis
].logscale
) {
821 // yRange[1] - y is unit distance from the bottom.
822 // yRange[1] - yRange[0] is the scale of the range.
823 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
824 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
826 var logr1
= Dygraph
.log10(yRange
[1]);
827 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
833 * Converts an x value to a percentage from the left to the right of
836 * If the coordinate represents a value visible on the canvas, then
837 * the value will be between 0 and 1, where 0 is the left of the canvas.
838 * However, this method will return values outside the range, as
839 * values can fall outside the canvas.
841 * If x is null, this returns null.
842 * @param { Number } x The data x-coordinate.
843 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
845 Dygraph
.prototype.toPercentXCoord
= function(x
) {
850 var xRange
= this.xAxisRange();
851 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
855 * Returns the number of columns (including the independent variable).
856 * @return { Integer } The number of columns.
858 Dygraph
.prototype.numColumns
= function() {
859 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
863 * Returns the number of rows (excluding any header/label row).
864 * @return { Integer } The number of rows, less any header.
866 Dygraph
.prototype.numRows
= function() {
867 return this.rawData_
.length
;
871 * Returns the full range of the x-axis, as determined by the most extreme
872 * values in the data set. Not affected by zooming, visibility, etc.
873 * TODO(danvk): merge w/ xAxisExtremes
874 * @return { Array<Number> } A [low, high] pair
877 Dygraph
.prototype.fullXRange_
= function() {
878 if (this.numRows() > 0) {
879 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
886 * Returns the value in the given row and column. If the row and column exceed
887 * the bounds on the data, returns null. Also returns null if the value is
889 * @param { Number} row The row number of the data (0-based). Row 0 is the
890 * first row of data, not a header row.
891 * @param { Number} col The column number of the data (0-based)
892 * @return { Number } The value in the specified cell or null if the row/col
895 Dygraph
.prototype.getValue
= function(row
, col
) {
896 if (row
< 0 || row
> this.rawData_
.length
) return null;
897 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
899 return this.rawData_
[row
][col
];
903 * Generates interface elements for the Dygraph: a containing div, a div to
904 * display the current point, and a textbox to adjust the rolling average
905 * period. Also creates the Renderer/Layout elements.
908 Dygraph
.prototype.createInterface_
= function() {
909 // Create the all-enclosing graph div
910 var enclosing
= this.maindiv_
;
912 this.graphDiv
= document
.createElement("div");
913 this.graphDiv
.style
.width
= this.width_
+ "px";
914 this.graphDiv
.style
.height
= this.height_
+ "px";
915 enclosing
.appendChild(this.graphDiv
);
917 // Create the canvas for interactive parts of the chart.
918 this.canvas_
= Dygraph
.createCanvas();
919 this.canvas_
.style
.position
= "absolute";
920 this.canvas_
.width
= this.width_
;
921 this.canvas_
.height
= this.height_
;
922 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
923 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
925 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
927 // ... and for static parts of the chart.
928 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
929 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
931 if (this.attr_('showRangeSelector')) {
932 // The range selector must be created here so that its canvases and contexts get created here.
933 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
934 this.rangeSelector_
= new DygraphRangeSelector(this);
937 // The interactive parts of the graph are drawn on top of the chart.
938 this.graphDiv
.appendChild(this.hidden_
);
939 this.graphDiv
.appendChild(this.canvas_
);
940 this.mouseEventElement_
= this.createMouseEventElement_();
942 // Create the grapher
943 this.layout_
= new DygraphLayout(this);
945 if (this.rangeSelector_
) {
946 // This needs to happen after the graph canvases are added to the div and the layout object is created.
947 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
952 this.mouseMoveHandler
= function(e
) {
953 dygraph
.mouseMove_(e
);
955 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
957 this.mouseOutHandler
= function(e
) {
958 dygraph
.mouseOut_(e
);
960 this.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
962 this.createDragInterface_();
964 this.resizeHandler
= function(e
) {
968 // Update when the window is resized.
969 // TODO(danvk): drop frames depending on complexity of the chart.
970 this.addEvent(window
, 'resize', this.resizeHandler
);
974 * Detach DOM elements in the dygraph and null out all data references.
975 * Calling this when you're done with a dygraph can dramatically reduce memory
976 * usage. See, e.g., the tests/perf.html example.
978 Dygraph
.prototype.destroy
= function() {
979 var removeRecursive
= function(node
) {
980 while (node
.hasChildNodes()) {
981 removeRecursive(node
.firstChild
);
982 node
.removeChild(node
.firstChild
);
986 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
987 var reg
= this.registeredEvents_
[idx
];
988 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
990 this.registeredEvents_
= [];
992 // remove mouse event handlers (This may not be necessary anymore)
993 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
994 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
995 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
996 removeRecursive(this.maindiv_
);
998 var nullOut
= function(obj
) {
1000 if (typeof(obj
[n
]) === 'object') {
1005 // remove event handlers
1006 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
1007 this.resizeHandler
= null;
1008 // These may not all be necessary, but it can't hurt...
1009 nullOut(this.layout_
);
1010 nullOut(this.plotter_
);
1015 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1016 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1017 * or the zoom rectangles) is done on this.canvas_.
1018 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1019 * @return {Object} The newly-created canvas
1022 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1023 var h
= Dygraph
.createCanvas();
1024 h
.style
.position
= "absolute";
1025 // TODO(danvk): h should be offset from canvas. canvas needs to include
1026 // some extra area to make it easier to zoom in on the far left and far
1027 // right. h needs to be precisely the plot area, so that clipping occurs.
1028 h
.style
.top
= canvas
.style
.top
;
1029 h
.style
.left
= canvas
.style
.left
;
1030 h
.width
= this.width_
;
1031 h
.height
= this.height_
;
1032 h
.style
.width
= this.width_
+ "px"; // for IE
1033 h
.style
.height
= this.height_
+ "px"; // for IE
1038 * Creates an overlay element used to handle mouse events.
1039 * @return {Object} The mouse event element.
1042 Dygraph
.prototype.createMouseEventElement_
= function() {
1043 if (this.isUsingExcanvas_
) {
1044 var elem
= document
.createElement("div");
1045 elem
.style
.position
= 'absolute';
1046 elem
.style
.backgroundColor
= 'white';
1047 elem
.style
.filter
= 'alpha(opacity=0)';
1048 elem
.style
.width
= this.width_
+ "px";
1049 elem
.style
.height
= this.height_
+ "px";
1050 this.graphDiv
.appendChild(elem
);
1053 return this.canvas_
;
1058 * Generate a set of distinct colors for the data series. This is done with a
1059 * color wheel. Saturation/Value are customizable, and the hue is
1060 * equally-spaced around the color wheel. If a custom set of colors is
1061 * specified, that is used instead.
1064 Dygraph
.prototype.setColors_
= function() {
1065 var labels
= this.getLabels();
1066 var num
= labels
.length
- 1;
1068 this.colorsMap_
= {};
1069 var colors
= this.attr_('colors');
1072 var sat
= this.attr_('colorSaturation') || 1.0;
1073 var val
= this.attr_('colorValue') || 0.5;
1074 var half
= Math
.ceil(num
/ 2);
1075 for (i
= 1; i
<= num
; i
++) {
1076 if (!this.visibility()[i
-1]) continue;
1077 // alternate colors for high contrast.
1078 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1079 var hue
= (1.0 * idx
/ (1 + num
));
1080 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1081 this.colors_
.push(colorStr
);
1082 this.colorsMap_
[labels
[i
]] = colorStr
;
1085 for (i
= 0; i
< num
; i
++) {
1086 if (!this.visibility()[i
]) continue;
1087 var colorStr
= colors
[i
% colors
.length
];
1088 this.colors_
.push(colorStr
);
1089 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1095 * Return the list of colors. This is either the list of colors passed in the
1096 * attributes or the autogenerated list of rgb(r,g,b) strings.
1097 * This does not return colors for invisible series.
1098 * @return {Array<string>} The list of colors.
1100 Dygraph
.prototype.getColors
= function() {
1101 return this.colors_
;
1105 * Returns a few attributes of a series, i.e. its color, its visibility, which
1106 * axis it's assigned to, and its column in the original data.
1107 * Returns null if the series does not exist.
1108 * Otherwise, returns an object with column, visibility, color and axis properties.
1109 * The "axis" property will be set to 1 for y1 and 2 for y2.
1110 * The "column" property can be fed back into getValue(row, column) to get
1111 * values for this series.
1113 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1115 var labels
= this.getLabels();
1116 for (var i
= 1; i
< labels
.length
; i
++) {
1117 if (labels
[i
] == series_name
) {
1122 if (idx
== -1) return null;
1127 visible
: this.visibility()[idx
- 1],
1128 color
: this.colorsMap_
[series_name
],
1129 axis
: 1 + this.seriesToAxisMap_
[series_name
]
1134 * Create the text box to adjust the averaging period
1137 Dygraph
.prototype.createRollInterface_
= function() {
1138 // Create a roller if one doesn't exist already.
1139 if (!this.roller_
) {
1140 this.roller_
= document
.createElement("input");
1141 this.roller_
.type
= "text";
1142 this.roller_
.style
.display
= "none";
1143 this.graphDiv
.appendChild(this.roller_
);
1146 var display
= this.attr_('showRoller') ? 'block' : 'none';
1148 var area
= this.plotter_
.area
;
1149 var textAttr
= { "position": "absolute",
1151 "top": (area
.y
+ area
.h
- 25) + "px",
1152 "left": (area
.x
+ 1) + "px",
1155 this.roller_
.size
= "2";
1156 this.roller_
.value
= this.rollPeriod_
;
1157 for (var name
in textAttr
) {
1158 if (textAttr
.hasOwnProperty(name
)) {
1159 this.roller_
.style
[name
] = textAttr
[name
];
1164 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1169 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1170 * canvas (i.e. DOM Coords).
1172 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1173 return Dygraph
.pageX(e
) - context
.px
;
1178 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1179 * canvas (i.e. DOM Coords).
1181 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1182 return Dygraph
.pageY(e
) - context
.py
;
1186 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1190 Dygraph
.prototype.createDragInterface_
= function() {
1192 // Tracks whether the mouse is down right now
1194 isPanning
: false, // is this drag part of a pan?
1195 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1196 dragStartX
: null, // pixel coordinates
1197 dragStartY
: null, // pixel coordinates
1198 dragEndX
: null, // pixel coordinates
1199 dragEndY
: null, // pixel coordinates
1200 dragDirection
: null,
1201 prevEndX
: null, // pixel coordinates
1202 prevEndY
: null, // pixel coordinates
1203 prevDragDirection
: null,
1204 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1206 // The value on the left side of the graph when a pan operation starts.
1207 initialLeftmostDate
: null,
1209 // The number of units each pixel spans. (This won't be valid for log
1211 xUnitsPerPixel
: null,
1213 // TODO(danvk): update this comment
1214 // The range in second/value units that the viewport encompasses during a
1215 // panning operation.
1218 // Top-left corner of the canvas, in DOM coords
1219 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1223 // Values for use with panEdgeFraction, which limit how far outside the
1224 // graph's data boundaries it can be panned.
1225 boundedDates
: null, // [minDate, maxDate]
1226 boundedValues
: null, // [[minValue, maxValue] ...]
1228 // contextB is the same thing as this context object but renamed.
1229 initializeMouseDown
: function(event
, g
, contextB
) {
1230 // prevents mouse drags from selecting page text.
1231 if (event
.preventDefault
) {
1232 event
.preventDefault(); // Firefox, Chrome, etc.
1234 event
.returnValue
= false; // IE
1235 event
.cancelBubble
= true;
1238 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1239 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1240 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1241 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1242 contextB
.cancelNextDblclick
= false;
1246 var interactionModel
= this.attr_("interactionModel");
1248 // Self is the graph.
1251 // Function that binds the graph and context to the handler.
1252 var bindHandler
= function(handler
) {
1253 return function(event
) {
1254 handler(event
, self
, context
);
1258 for (var eventName
in interactionModel
) {
1259 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1260 this.addEvent(this.mouseEventElement_
, eventName
,
1261 bindHandler(interactionModel
[eventName
]));
1264 // If the user releases the mouse button during a drag, but not over the
1265 // canvas, then it doesn't count as a zooming action.
1266 this.mouseUpHandler_
= function(event
) {
1267 if (context
.isZooming
|| context
.isPanning
) {
1268 context
.isZooming
= false;
1269 context
.dragStartX
= null;
1270 context
.dragStartY
= null;
1273 if (context
.isPanning
) {
1274 context
.isPanning
= false;
1275 context
.draggingDate
= null;
1276 context
.dateRange
= null;
1277 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1278 delete self
.axes_
[i
].draggingValue
;
1279 delete self
.axes_
[i
].dragValueRange
;
1284 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1288 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1289 * up any previous zoom rectangles that were drawn. This could be optimized to
1290 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1293 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1294 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1295 * @param {Number} startX The X position where the drag started, in canvas
1297 * @param {Number} endX The current X position of the drag, in canvas coords.
1298 * @param {Number} startY The Y position where the drag started, in canvas
1300 * @param {Number} endY The current Y position of the drag, in canvas coords.
1301 * @param {Number} prevDirection the value of direction on the previous call to
1302 * this function. Used to avoid excess redrawing
1303 * @param {Number} prevEndX The value of endX on the previous call to this
1304 * function. Used to avoid excess redrawing
1305 * @param {Number} prevEndY The value of endY on the previous call to this
1306 * function. Used to avoid excess redrawing
1309 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1310 endY
, prevDirection
, prevEndX
,
1312 var ctx
= this.canvas_ctx_
;
1314 // Clean up from the previous rect if necessary
1315 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1316 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1317 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1318 } else if (prevDirection
== Dygraph
.VERTICAL
){
1319 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1320 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1323 // Draw a light-grey rectangle to show the new viewing area
1324 if (direction
== Dygraph
.HORIZONTAL
) {
1325 if (endX
&& startX
) {
1326 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1327 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1328 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1330 } else if (direction
== Dygraph
.VERTICAL
) {
1331 if (endY
&& startY
) {
1332 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1333 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1334 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1338 if (this.isUsingExcanvas_
) {
1339 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1344 * Clear the zoom rectangle (and perform no zoom).
1347 Dygraph
.prototype.clearZoomRect_
= function() {
1348 this.currentZoomRectArgs_
= null;
1349 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1353 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1354 * the canvas. The exact zoom window may be slightly larger if there are no data
1355 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1356 * which accepts dates that match the raw data. This function redraws the graph.
1358 * @param {Number} lowX The leftmost pixel value that should be visible.
1359 * @param {Number} highX The rightmost pixel value that should be visible.
1362 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1363 this.currentZoomRectArgs_
= null;
1364 // Find the earliest and latest dates contained in this canvasx range.
1365 // Convert the call to date ranges of the raw data.
1366 var minDate
= this.toDataXCoord(lowX
);
1367 var maxDate
= this.toDataXCoord(highX
);
1368 this.doZoomXDates_(minDate
, maxDate
);
1372 * Transition function to use in animations. Returns values between 0.0
1373 * (totally old values) and 1.0 (totally new values) for each frame.
1376 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1378 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1382 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1383 * method with doZoomX which accepts pixel coordinates. This function redraws
1386 * @param {Number} minDate The minimum date that should be visible.
1387 * @param {Number} maxDate The maximum date that should be visible.
1390 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1391 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1392 // can produce strange effects. Rather than the y-axis transitioning slowly
1393 // between values, it can jerk around.)
1394 var old_window
= this.xAxisRange();
1395 var new_window
= [minDate
, maxDate
];
1396 this.zoomed_x_
= true;
1398 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1399 if (that
.attr_("zoomCallback")) {
1400 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1406 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1407 * the canvas. This function redraws the graph.
1409 * @param {Number} lowY The topmost pixel value that should be visible.
1410 * @param {Number} highY The lowest pixel value that should be visible.
1413 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1414 this.currentZoomRectArgs_
= null;
1415 // Find the highest and lowest values in pixel range for each axis.
1416 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1417 // This is because pixels increase as you go down on the screen, whereas data
1418 // coordinates increase as you go up the screen.
1419 var oldValueRanges
= this.yAxisRanges();
1420 var newValueRanges
= [];
1421 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1422 var hi
= this.toDataYCoord(lowY
, i
);
1423 var low
= this.toDataYCoord(highY
, i
);
1424 newValueRanges
.push([low
, hi
]);
1427 this.zoomed_y_
= true;
1429 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1430 if (that
.attr_("zoomCallback")) {
1431 var xRange
= that
.xAxisRange();
1432 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1438 * Reset the zoom to the original view coordinates. This is the same as
1439 * double-clicking on the graph.
1443 Dygraph
.prototype.doUnzoom_
= function() {
1444 var dirty
= false, dirtyX
= false, dirtyY
= false;
1445 if (this.dateWindow_
!== null) {
1450 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1451 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1457 // Clear any selection, since it's likely to be drawn in the wrong place.
1458 this.clearSelection();
1461 this.zoomed_x_
= false;
1462 this.zoomed_y_
= false;
1464 var minDate
= this.rawData_
[0][0];
1465 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1467 // With only one frame, don't bother calculating extreme ranges.
1468 // TODO(danvk): merge this block w/ the code below
.
1469 if (!this.attr_("animatedZooms")) {
1470 this.dateWindow_
= null;
1471 for (i
= 0; i
< this.axes_
.length
; i
++) {
1472 if (this.axes_
[i
].valueWindow
!== null) {
1473 delete this.axes_
[i
].valueWindow
;
1477 if (this.attr_("zoomCallback")) {
1478 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1483 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1485 oldWindow
= this.xAxisRange();
1486 newWindow
= [minDate
, maxDate
];
1490 oldValueRanges
= this.yAxisRanges();
1491 // TODO(danvk): this is pretty inefficient
1492 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1493 var extremes
= packed
[1];
1495 // this has the side-effect of modifying this.axes_.
1496 // this doesn't make much sense in this context, but it's convenient (we
1497 // need this.axes_[*].extremeValues) and not harmful since we'll be
1498 // calling drawGraph_ shortly, which clobbers these values.
1499 this.computeYAxisRanges_(extremes
);
1501 newValueRanges
= [];
1502 for (i
= 0; i
< this.axes_
.length
; i
++) {
1503 var axis
= this.axes_
[i
];
1504 newValueRanges
.push(axis
.valueRange
!= null ? axis
.valueRange
: axis
.extremeRange
);
1509 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1511 that
.dateWindow_
= null;
1512 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1513 if (that
.axes_
[i
].valueWindow
!== null) {
1514 delete that
.axes_
[i
].valueWindow
;
1517 if (that
.attr_("zoomCallback")) {
1518 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1525 * Combined animation logic for all zoom functions.
1526 * either the x parameters or y parameters may be null.
1529 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1530 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1533 var valueRanges
= [];
1536 if (oldXRange
!== null && newXRange
!== null) {
1537 for (step
= 1; step
<= steps
; step
++) {
1538 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1539 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1540 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1544 if (oldYRanges
!== null && newYRanges
!== null) {
1545 for (step
= 1; step
<= steps
; step
++) {
1546 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1548 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1549 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1550 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1552 valueRanges
[step
-1] = thisRange
;
1557 Dygraph
.repeatAndCleanup(function(step
) {
1558 if (valueRanges
.length
) {
1559 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1560 var w
= valueRanges
[step
][i
];
1561 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1564 if (windows
.length
) {
1565 that
.dateWindow_
= windows
[step
];
1568 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1572 * Get the current graph's area object.
1574 * Returns: {x, y, w, h}
1576 Dygraph
.prototype.getArea
= function() {
1577 return this.plotter_
.area
;
1581 * Convert a mouse event to DOM coordinates relative to the graph origin.
1583 * Returns a two-element array: [X, Y].
1585 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1586 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1587 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1588 return [canvasx
, canvasy
];
1592 * Given a canvas X coordinate, find the closest row.
1593 * @param {Number} domX graph-relative DOM X coordinate
1594 * Returns: row number, integer
1597 Dygraph
.prototype.findClosestRow
= function(domX
) {
1598 var minDistX
= Infinity
;
1599 var pointIdx
= -1, setIdx
= -1;
1600 var sets
= this.layout_
.points
;
1601 for (var i
= 0; i
< sets
.length
; i
++) {
1602 var points
= sets
[i
];
1603 var len
= points
.length
;
1604 for (var j
= 0; j
< len
; j
++) {
1605 var point
= points
[j
];
1606 if (!Dygraph
.isValidPoint(point
, true)) continue;
1607 var dist
= Math
.abs(point
.canvasx
- domX
);
1608 if (dist
< minDistX
) {
1616 // TODO(danvk): remove this function; it's trivial and has only one use.
1617 return this.idxToRow_(setIdx
, pointIdx
);
1621 * Given canvas X,Y coordinates, find the closest point.
1623 * This finds the individual data point across all visible series
1624 * that's closest to the supplied DOM coordinates using the standard
1625 * Euclidean X,Y distance.
1627 * @param {Number} domX graph-relative DOM X coordinate
1628 * @param {Number} domY graph-relative DOM Y coordinate
1629 * Returns: {row, seriesName, point}
1632 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1633 var minDist
= Infinity
;
1635 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1636 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1637 var points
= this.layout_
.points
[setIdx
];
1638 for (var i
= 0; i
< points
.length
; ++i
) {
1639 var point
= points
[i
];
1640 if (!Dygraph
.isValidPoint(point
)) continue;
1641 dx
= point
.canvasx
- domX
;
1642 dy
= point
.canvasy
- domY
;
1643 dist
= dx
* dx
+ dy
* dy
;
1644 if (dist
< minDist
) {
1646 closestPoint
= point
;
1647 closestSeries
= setIdx
;
1652 var name
= this.layout_
.setNames
[closestSeries
];
1654 row
: idx
+ this.getLeftBoundary_(),
1661 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1663 * This first finds the X data point closest to the supplied DOM X coordinate,
1664 * then finds the series which puts the Y coordinate on top of its filled area,
1665 * using linear interpolation between adjacent point pairs.
1667 * @param {Number} domX graph-relative DOM X coordinate
1668 * @param {Number} domY graph-relative DOM Y coordinate
1669 * Returns: {row, seriesName, point}
1672 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1673 var row
= this.findClosestRow(domX
);
1674 var boundary
= this.getLeftBoundary_();
1675 var rowIdx
= row
- boundary
;
1676 var sets
= this.layout_
.points
;
1677 var closestPoint
, closestSeries
;
1678 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1679 var points
= this.layout_
.points
[setIdx
];
1680 if (rowIdx
>= points
.length
) continue;
1681 var p1
= points
[rowIdx
];
1682 if (!Dygraph
.isValidPoint(p1
)) continue;
1683 var py
= p1
.canvasy
;
1684 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1685 // interpolate series Y value using next point
1686 var p2
= points
[rowIdx
+ 1];
1687 if (Dygraph
.isValidPoint(p2
)) {
1688 var dx
= p2
.canvasx
- p1
.canvasx
;
1690 var r
= (domX
- p1
.canvasx
) / dx
;
1691 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1694 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1695 // interpolate series Y value using previous point
1696 var p0
= points
[rowIdx
- 1];
1697 if (Dygraph
.isValidPoint(p0
)) {
1698 var dx
= p1
.canvasx
- p0
.canvasx
;
1700 var r
= (p1
.canvasx
- domX
) / dx
;
1701 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1705 // Stop if the point (domX, py) is above this series' upper edge
1706 if (setIdx
== 0 || py
< domY
) {
1708 closestSeries
= setIdx
;
1711 var name
= this.layout_
.setNames
[closestSeries
];
1720 * When the mouse moves in the canvas, display information about a nearby data
1721 * point and draw dots over those points in the data series. This function
1722 * takes care of cleanup of previously-drawn dots.
1723 * @param {Object} event The mousemove event from the browser.
1726 Dygraph
.prototype.mouseMove_
= function(event
) {
1727 // This prevents JS errors when mousing over the canvas before data loads.
1728 var points
= this.layout_
.points
;
1729 if (points
=== undefined
|| points
=== null) return;
1731 var canvasCoords
= this.eventToDomCoords(event
);
1732 var canvasx
= canvasCoords
[0];
1733 var canvasy
= canvasCoords
[1];
1735 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1736 var selectionChanged
= false;
1737 if (highlightSeriesOpts
) {
1739 if (this.attr_("stackedGraph")) {
1740 closest
= this.findStackedPoint(canvasx
, canvasy
);
1742 closest
= this.findClosestPoint(canvasx
, canvasy
);
1744 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1746 var idx
= this.findClosestRow(canvasx
);
1747 selectionChanged
= this.setSelection(idx
);
1750 var callback
= this.attr_("highlightCallback");
1751 if (callback
&& selectionChanged
) {
1752 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1757 * Fetch left offset from first defined boundaryIds record (see bug #236).
1760 Dygraph
.prototype.getLeftBoundary_
= function() {
1761 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1762 if (this.boundaryIds_
[i
] !== undefined
) {
1763 return this.boundaryIds_
[i
][0];
1770 * Transforms layout_.points index into data row number.
1771 * @param int layout_.points index
1772 * @return int row number, or -1 if none could be found.
1775 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1776 if (rowIdx
< 0) return -1;
1778 var boundary
= this.getLeftBoundary_();
1779 return boundary
+ rowIdx
;
1780 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1781 // var set = this.layout_.datasets[setIdx];
1782 // if (idx < set.length) {
1783 // return boundary + idx;
1785 // idx -= set.length;
1790 Dygraph
.prototype.animateSelection_
= function(direction
) {
1791 var totalSteps
= 10;
1793 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1794 if (this.animateId
=== undefined
) this.animateId
= 0;
1795 var start
= this.fadeLevel
;
1796 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1798 if (this.fadeLevel
) {
1799 this.updateSelection_(1.0);
1804 var thisId
= ++this.animateId
;
1806 Dygraph
.repeatAndCleanup(
1808 // ignore simultaneous animations
1809 if (that
.animateId
!= thisId
) return;
1811 that
.fadeLevel
+= direction
;
1812 if (that
.fadeLevel
=== 0) {
1813 that
.clearSelection();
1815 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1818 steps
, millis
, function() {});
1822 * Draw dots over the selectied points in the data series. This function
1823 * takes care of cleanup of previously-drawn dots.
1826 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1827 var defaultPrevented
= this.cascadeEvents_('select', {
1828 selectedX
: this.lastx_
,
1829 selectedPoints
: this.selPoints_
1831 // TODO(danvk): use defaultPrevented here?
1833 // Clear the previously drawn vertical, if there is one
1835 var ctx
= this.canvas_ctx_
;
1836 if (this.attr_('highlightSeriesOpts')) {
1837 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1838 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1840 // Activating background fade includes an animation effect for a gradual
1841 // fade. TODO(klausw): make this independently configurable if it causes
1842 // issues? Use a shared preference to control animations?
1843 var animateBackgroundFade
= true;
1844 if (animateBackgroundFade
) {
1845 if (opt_animFraction
=== undefined
) {
1846 // start a new animation
1847 this.animateSelection_(1);
1850 alpha
*= opt_animFraction
;
1852 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1853 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1855 var setIdx
= this.datasetIndexFromSetName_(this.highlightSet_
);
1856 this.plotter_
._drawLine(ctx
, setIdx
);
1857 } else if (this.previousVerticalX_
>= 0) {
1858 // Determine the maximum highlight circle size.
1859 var maxCircleSize
= 0;
1860 var labels
= this.attr_('labels');
1861 for (i
= 1; i
< labels
.length
; i
++) {
1862 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1863 if (r
> maxCircleSize
) maxCircleSize
= r
;
1865 var px
= this.previousVerticalX_
;
1866 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1867 2 * maxCircleSize
+ 2, this.height_
);
1870 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1871 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1874 if (this.selPoints_
.length
> 0) {
1875 // Draw colored circles over the center of each selected point
1876 var canvasx
= this.selPoints_
[0].canvasx
;
1878 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1879 var pt
= this.selPoints_
[i
];
1880 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1882 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1883 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1884 var color
= this.plotter_
.colors
[pt
.name
];
1886 callback
= Dygraph
.Circles
.DEFAULT
;
1888 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1889 ctx
.strokeStyle
= color
;
1890 ctx
.fillStyle
= color
;
1891 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1896 this.previousVerticalX_
= canvasx
;
1901 * Manually set the selected points and display information about them in the
1902 * legend. The selection can be cleared using clearSelection() and queried
1903 * using getSelection().
1904 * @param { Integer } row number that should be highlighted (i.e. appear with
1905 * hover dots on the chart). Set to false to clear any selection.
1906 * @param { seriesName } optional series name to highlight that series with the
1907 * the highlightSeriesOpts setting.
1909 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
) {
1910 // Extract the points we've selected
1911 this.selPoints_
= [];
1913 if (row
!== false) {
1914 row
-= this.getLeftBoundary_();
1917 var changed
= false;
1918 if (row
!== false && row
>= 0) {
1919 if (row
!= this.lastRow_
) changed
= true;
1920 this.lastRow_
= row
;
1921 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1922 var set
= this.layout_
.datasets
[setIdx
];
1923 if (row
< set
.length
) {
1924 var point
= this.layout_
.points
[setIdx
][row
];
1926 if (this.attr_("stackedGraph")) {
1927 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1930 if (!(point
.yval
=== null)) this.selPoints_
.push(point
);
1934 if (this.lastRow_
>= 0) changed
= true;
1938 if (this.selPoints_
.length
) {
1939 this.lastx_
= this.selPoints_
[0].xval
;
1944 if (opt_seriesName
!== undefined
) {
1945 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1946 this.highlightSet_
= opt_seriesName
;
1950 this.updateSelection_(undefined
);
1956 * The mouse has left the canvas. Clear out whatever artifacts remain
1957 * @param {Object} event the mouseout event from the browser.
1960 Dygraph
.prototype.mouseOut_
= function(event
) {
1961 if (this.attr_("unhighlightCallback")) {
1962 this.attr_("unhighlightCallback")(event
);
1965 if (this.attr_("hideOverlayOnMouseOut")) {
1966 this.clearSelection();
1971 * Clears the current selection (i.e. points that were highlighted by moving
1972 * the mouse over the chart).
1974 Dygraph
.prototype.clearSelection
= function() {
1975 this.cascadeEvents_('deselect', {});
1977 // Get rid of the overlay data
1978 if (this.fadeLevel
) {
1979 this.animateSelection_(-1);
1982 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
1984 this.selPoints_
= [];
1987 this.highlightSet_
= null;
1991 * Returns the number of the currently selected row. To get data for this row,
1992 * you can use the getValue method.
1993 * @return { Integer } row number, or -1 if nothing is selected
1995 Dygraph
.prototype.getSelection
= function() {
1996 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2000 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2001 var points
= this.layout_
.points
[setIdx
];
2002 for (var row
= 0; row
< points
.length
; row
++) {
2003 if (points
[row
].x
== this.selPoints_
[0].x
) {
2004 return row
+ this.getLeftBoundary_();
2012 * Returns the name of the currently-highlighted series.
2013 * Only available when the highlightSeriesOpts option is in use.
2015 Dygraph
.prototype.getHighlightSeries
= function() {
2016 return this.highlightSet_
;
2020 * Fires when there's data available to be graphed.
2021 * @param {String} data Raw CSV data to be plotted
2024 Dygraph
.prototype.loadedEvent_
= function(data
) {
2025 this.rawData_
= this.parseCSV_(data
);
2030 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2033 Dygraph
.prototype.addXTicks_
= function() {
2034 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2036 if (this.dateWindow_
) {
2037 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2039 range
= this.fullXRange_();
2042 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2043 var xTicks
= xAxisOptionsView('ticker')(
2046 this.width_
, // TODO(danvk): should be area.width
2049 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2050 // console.log(msg);
2051 this.layout_
.setXTicks(xTicks
);
2056 * Computes the range of the data series (including confidence intervals).
2057 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2058 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2059 * @return [low, high]
2061 Dygraph
.prototype.extremeValues_
= function(series
) {
2062 var minY
= null, maxY
= null, j
, y
;
2064 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2066 // With custom bars, maxY is the max of the high values.
2067 for (j
= 0; j
< series
.length
; j
++) {
2068 y
= series
[j
][1][0];
2070 var low
= y
- series
[j
][1][1];
2071 var high
= y
+ series
[j
][1][2];
2072 if (low
> y
) low
= y
; // this can happen with custom bars,
2073 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2074 if (maxY
=== null || high
> maxY
) {
2077 if (minY
=== null || low
< minY
) {
2082 for (j
= 0; j
< series
.length
; j
++) {
2084 if (y
=== null || isNaN(y
)) continue;
2085 if (maxY
=== null || y
> maxY
) {
2088 if (minY
=== null || y
< minY
) {
2094 return [minY
, maxY
];
2099 * This function is called once when the chart's data is changed or the options
2100 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2101 * idea is that values derived from the chart's data can be computed here,
2102 * rather than every time the chart is drawn. This includes things like the
2103 * number of axes, rolling averages, etc.
2105 Dygraph
.prototype.predraw_
= function() {
2106 var start
= new Date();
2108 // TODO(danvk): move more computations out of drawGraph_ and into here.
2109 this.computeYAxes_();
2111 // Create a new plotter.
2112 if (this.plotter_
) {
2113 this.cascadeEvents_('clearChart');
2114 this.plotter_
.clear();
2116 this.plotter_
= new DygraphCanvasRenderer(this,
2121 // The roller sits in the bottom left corner of the chart. We don't know where
2122 // this will be until the options are available, so it's positioned here.
2123 this.createRollInterface_();
2125 this.cascadeEvents_('predraw');
2127 if (this.rangeSelector_
) {
2128 this.rangeSelector_
.renderStaticLayer();
2131 // Convert the raw data (a 2D array) into the internal format and compute
2132 // rolling averages.
2133 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2134 for (var i
= 1; i
< this.numColumns(); i
++) {
2135 var logScale
= this.attr_('logscale', i
); // TODO(klausw): this looks wrong
2136 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2137 series
= this.rollingAverage(series
, this.rollPeriod_
);
2138 this.rolledSeries_
.push(series
);
2141 // If the data or options have changed, then we'd better redraw.
2144 // This is used to determine whether to do various animations.
2145 var end
= new Date();
2146 this.drawingTimeMs_
= (end
- start
);
2150 * Loop over all fields and create datasets, calculating extreme y-values for
2151 * each series and extreme x-indices as we go.
2153 * dateWindow is passed in as an explicit parameter so that we can compute
2154 * extreme values "speculatively", i.e. without actually setting state on the
2157 * TODO(danvk): make this more of a true function
2158 * @return [ datasets, seriesExtremes, boundaryIds ]
2161 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2162 var boundaryIds
= [];
2163 var cumulative_y
= []; // For stacked series.
2165 var extremes
= {}; // series name -> [low, high]
2168 // Loop over the fields (series). Go from the last to the first,
2169 // because if they're stacked that's how we accumulate the values.
2170 var num_series
= rolledSeries
.length
- 1;
2171 for (i
= num_series
; i
>= 1; i
--) {
2172 if (!this.visibility()[i
- 1]) continue;
2174 // Note: this copy _is_ necessary at the moment.
2175 // If you remove it, it breaks zooming with error bars on.
2176 // TODO(danvk): investigate further & write a test for this.
2178 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2179 series
.push(rolledSeries
[i
][j
]);
2182 // Prune down to the desired range, if necessary (for zooming)
2183 // Because there can be lines going to points outside of the visible area,
2184 // we actually prune to visible points, plus one on either side.
2185 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2187 var low
= dateWindow
[0];
2188 var high
= dateWindow
[1];
2190 // TODO(danvk): do binary search instead of linear search.
2191 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2192 var firstIdx
= null, lastIdx
= null;
2193 for (k
= 0; k
< series
.length
; k
++) {
2194 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2197 if (series
[k
][0] <= high
) {
2201 if (firstIdx
=== null) firstIdx
= 0;
2202 if (firstIdx
> 0) firstIdx
--;
2203 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2204 if (lastIdx
< series
.length
- 1) lastIdx
++;
2205 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2206 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2207 pruned
.push(series
[k
]);
2211 boundaryIds
[i
-1] = [0, series
.length
-1];
2214 var seriesExtremes
= this.extremeValues_(series
);
2217 for (j
=0; j
<series
.length
; j
++) {
2218 series
[j
] = [series
[j
][0],
2223 } else if (this.attr_("stackedGraph")) {
2224 var l
= series
.length
;
2226 for (j
= 0; j
< l
; j
++) {
2227 // If one data set has a NaN, let all subsequent stacked
2228 // sets inherit the NaN -- only start at 0 for the first set.
2229 var x
= series
[j
][0];
2230 if (cumulative_y
[x
] === undefined
) {
2231 cumulative_y
[x
] = 0;
2234 actual_y
= series
[j
][1];
2235 if (actual_y
=== null) {
2236 series
[j
] = [x
, null];
2240 cumulative_y
[x
] += actual_y
;
2242 series
[j
] = [x
, cumulative_y
[x
]];
2244 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2245 seriesExtremes
[1] = cumulative_y
[x
];
2247 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2248 seriesExtremes
[0] = cumulative_y
[x
];
2253 var seriesName
= this.attr_("labels")[i
];
2254 extremes
[seriesName
] = seriesExtremes
;
2255 datasets
[i
] = series
;
2258 // For stacked graphs, a NaN value for any point in the sum should create a
2259 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2260 if (this.attr_("stackedGraph")) {
2261 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2262 // Use the first nonempty dataset to get X values.
2263 if (!datasets
[k
]) continue;
2264 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2265 var x
= datasets
[k
][j
][0];
2266 if (isNaN(cumulative_y
[x
])) {
2267 // Set all Y values to NaN at that X value.
2268 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2269 if (!datasets
[i
]) continue;
2270 datasets
[i
][j
][1] = NaN
;
2278 return [ datasets
, extremes
, boundaryIds
];
2282 * Update the graph with new data. This method is called when the viewing area
2283 * has changed. If the underlying data or options have changed, predraw_ will
2284 * be called before drawGraph_ is called.
2288 Dygraph
.prototype.drawGraph_
= function() {
2289 var start
= new Date();
2291 // This is used to set the second parameter to drawCallback, below.
2292 var is_initial_draw
= this.is_initial_draw_
;
2293 this.is_initial_draw_
= false;
2295 this.layout_
.removeAllDatasets();
2297 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2299 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2300 var datasets
= packed
[0];
2301 var extremes
= packed
[1];
2302 this.boundaryIds_
= packed
[2];
2304 this.setIndexByName_
= {};
2305 var labels
= this.attr_("labels");
2306 if (labels
.length
> 0) {
2307 this.setIndexByName_
[labels
[0]] = 0;
2310 for (var i
= 1; i
< datasets
.length
; i
++) {
2311 this.setIndexByName_
[labels
[i
]] = i
;
2312 if (!this.visibility()[i
- 1]) continue;
2313 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2314 this.datasetIndex_
[i
] = dataIdx
++;
2317 this.computeYAxisRanges_(extremes
);
2318 this.layout_
.setYAxes(this.axes_
);
2322 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2323 var tmp_zoomed_x
= this.zoomed_x_
;
2324 // Tell PlotKit to use this new data and render itself
2325 this.layout_
.setDateWindow(this.dateWindow_
);
2326 this.zoomed_x_
= tmp_zoomed_x
;
2327 this.layout_
.evaluateWithError();
2328 this.renderGraph_(is_initial_draw
);
2330 if (this.attr_("timingName")) {
2331 var end
= new Date();
2333 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2339 * This does the work of drawing the chart. It assumes that the layout and axis
2340 * scales have already been set (e.g. by predraw_).
2344 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2345 this.cascadeEvents_('clearChart');
2346 this.plotter_
.clear();
2348 if (this.attr_('underlayCallback')) {
2349 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2350 // users who expect a deprecated form of this callback.
2351 this.attr_('underlayCallback')(
2352 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2356 canvas
: this.hidden_
,
2357 drawingContext
: this.hidden_ctx_
,
2359 this.cascadeEvents_('willDrawChart', e
);
2360 this.plotter_
.render();
2361 this.cascadeEvents_('didDrawChart', e
);
2363 // TODO(danvk): is this a performance bottleneck when panning?
2364 // The interaction canvas should already be empty in that situation.
2365 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2366 this.canvas_
.height
);
2368 // Generate a static legend before any particular point is selected.
2370 if (this.rangeSelector_
) {
2371 this.rangeSelector_
.renderInteractiveLayer();
2373 if (this.attr_("drawCallback") !== null) {
2374 this.attr_("drawCallback")(this, is_initial_draw
);
2380 * Determine properties of the y-axes which are independent of the data
2381 * currently being displayed. This includes things like the number of axes and
2382 * the style of the axes. It does not include the range of each axis and its
2384 * This fills in this.axes_ and this.seriesToAxisMap_.
2385 * axes_ = [ { options } ]
2386 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2387 * indices are into the axes_ array.
2389 Dygraph
.prototype.computeYAxes_
= function() {
2390 // Preserve valueWindow settings if they exist, and if the user hasn't
2391 // specified a new valueRange.
2392 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2393 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2395 for (index
= 0; index
< this.axes_
.length
; index
++) {
2396 valueWindows
.push(this.axes_
[index
].valueWindow
);
2400 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2401 this.seriesToAxisMap_
= {};
2403 // Get a list of series names.
2404 var labels
= this.attr_("labels");
2406 for (i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2408 // all options which could be applied per-axis:
2416 'axisLabelFontSize',
2421 // Copy global axis options over to the first axis.
2422 for (i
= 0; i
< axisOptions
.length
; i
++) {
2423 var k
= axisOptions
[i
];
2425 if (v
) this.axes_
[0][k
] = v
;
2428 // Go through once and add all the axes.
2429 for (seriesName
in series
) {
2430 if (!series
.hasOwnProperty(seriesName
)) continue;
2431 axis
= this.attr_("axis", seriesName
);
2432 if (axis
=== null) {
2433 this.seriesToAxisMap_
[seriesName
] = 0;
2436 if (typeof(axis
) == 'object') {
2437 // Add a new axis, making a copy of its per-axis options.
2439 Dygraph
.update(opts
, this.axes_
[0]);
2440 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2441 var yAxisId
= this.axes_
.length
;
2442 opts
.yAxisId
= yAxisId
;
2444 Dygraph
.update(opts
, axis
);
2445 this.axes_
.push(opts
);
2446 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2450 // Go through one more time and assign series to an axis defined by another
2451 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2452 for (seriesName
in series
) {
2453 if (!series
.hasOwnProperty(seriesName
)) continue;
2454 axis
= this.attr_("axis", seriesName
);
2455 if (typeof(axis
) == 'string') {
2456 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2457 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2458 "series " + axis
+ ", which does not define its own axis.");
2461 var idx
= this.seriesToAxisMap_
[axis
];
2462 this.seriesToAxisMap_
[seriesName
] = idx
;
2466 if (valueWindows
!== undefined
) {
2467 // Restore valueWindow settings.
2468 for (index
= 0; index
< valueWindows
.length
; index
++) {
2469 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2474 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2476 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2477 v
= opts("valueRange");
2478 if (v
) this.axes_
[axis
].valueRange
= v
;
2479 } else { // To keep old behavior
2480 var axes
= this.user_attrs_
.axes
;
2481 if (axes
&& axes
.y2
) {
2482 v
= axes
.y2
.valueRange
;
2483 if (v
) this.axes_
[axis
].valueRange
= v
;
2491 * Returns the number of y-axes on the chart.
2492 * @return {Number} the number of axes.
2494 Dygraph
.prototype.numAxes
= function() {
2496 for (var series
in this.seriesToAxisMap_
) {
2497 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2498 var idx
= this.seriesToAxisMap_
[series
];
2499 if (idx
> last_axis
) last_axis
= idx
;
2501 return 1 + last_axis
;
2506 * Returns axis properties for the given series.
2507 * @param { String } setName The name of the series for which to get axis
2508 * properties, e.g. 'Y1'.
2509 * @return { Object } The axis properties.
2511 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2512 // TODO(danvk): handle errors.
2513 return this.axes_
[this.seriesToAxisMap_
[series
]];
2518 * Determine the value range and tick marks for each axis.
2519 * @param {Object} extremes A mapping from seriesName -> [low, high]
2520 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2522 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2523 // Build a map from axis number -> [list of series names]
2524 var seriesForAxis
= [], series
;
2525 for (series
in this.seriesToAxisMap_
) {
2526 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2527 var idx
= this.seriesToAxisMap_
[series
];
2528 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2529 seriesForAxis
[idx
].push(series
);
2532 // Compute extreme values, a span and tick marks for each axis.
2533 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2534 var axis
= this.axes_
[i
];
2536 if (!seriesForAxis
[i
]) {
2537 // If no series are defined or visible then use a reasonable default
2538 axis
.extremeRange
= [0, 1];
2540 // Calculate the extremes of extremes.
2541 series
= seriesForAxis
[i
];
2542 var minY
= Infinity
; // extremes[series[0]][0];
2543 var maxY
= -Infinity
; // extremes[series[0]][1];
2544 var extremeMinY
, extremeMaxY
;
2546 for (var j
= 0; j
< series
.length
; j
++) {
2547 // this skips invisible series
2548 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2550 // Only use valid extremes to stop null data series' from corrupting the scale.
2551 extremeMinY
= extremes
[series
[j
]][0];
2552 if (extremeMinY
!== null) {
2553 minY
= Math
.min(extremeMinY
, minY
);
2555 extremeMaxY
= extremes
[series
[j
]][1];
2556 if (extremeMaxY
!== null) {
2557 maxY
= Math
.max(extremeMaxY
, maxY
);
2560 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2562 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2563 if (minY
== Infinity
) minY
= 0;
2564 if (maxY
== -Infinity
) maxY
= 1;
2566 // Add some padding and round up to an integer to be human-friendly.
2567 var span
= maxY
- minY
;
2568 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2569 if (span
=== 0) { span
= maxY
; }
2571 var maxAxisY
, minAxisY
;
2572 if (axis
.logscale
) {
2573 maxAxisY
= maxY
+ 0.1 * span
;
2576 maxAxisY
= maxY
+ 0.1 * span
;
2577 minAxisY
= minY
- 0.1 * span
;
2579 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2580 if (!this.attr_("avoidMinZero")) {
2581 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2582 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2585 if (this.attr_("includeZero")) {
2586 if (maxY
< 0) maxAxisY
= 0;
2587 if (minY
> 0) minAxisY
= 0;
2590 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2592 if (axis
.valueWindow
) {
2593 // This is only set if the user has zoomed on the y-axis. It is never set
2594 // by a user. It takes precedence over axis.valueRange because, if you set
2595 // valueRange, you'd still expect to be able to pan.
2596 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2597 } else if (axis
.valueRange
) {
2598 // This is a user-set value range for this axis.
2599 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2601 axis
.computedValueRange
= axis
.extremeRange
;
2604 // Add ticks. By default, all axes inherit the tick positions of the
2605 // primary axis. However, if an axis is specifically marked as having
2606 // independent ticks, then that is permissible as well.
2607 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2608 var ticker
= opts('ticker');
2609 if (i
=== 0 || axis
.independentTicks
) {
2610 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2611 axis
.computedValueRange
[1],
2612 this.height_
, // TODO(danvk): should be area.height
2616 var p_axis
= this.axes_
[0];
2617 var p_ticks
= p_axis
.ticks
;
2618 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2619 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2620 var tick_values
= [];
2621 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2622 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2623 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2624 tick_values
.push(y_val
);
2627 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2628 axis
.computedValueRange
[1],
2629 this.height_
, // TODO(danvk): should be area.height
2638 * Extracts one series from the raw data (a 2D array) into an array of (date,
2641 * This is where undesirable points (i.e. negative values on log scales and
2642 * missing values through which we wish to connect lines) are dropped.
2643 * TODO(danvk): the "missing values" bit above doesn't seem right.
2647 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2648 // TODO(danvk): pre-allocate series here.
2650 for (var j
= 0; j
< rawData
.length
; j
++) {
2651 var x
= rawData
[j
][0];
2652 var point
= rawData
[j
][i
];
2654 // On the log scale, points less than zero do not exist.
2655 // This will create a gap in the chart.
2660 series
.push([x
, point
]);
2667 * Calculates the rolling average of a data set.
2668 * If originalData is [label, val], rolls the average of those.
2669 * If originalData is [label, [, it's interpreted as [value, stddev]
2670 * and the roll is returned in the same form, with appropriately reduced
2671 * stddev for each value.
2672 * Note that this is where fractional input (i.e. '5/10') is converted into
2674 * @param {Array} originalData The data in the appropriate format (see above)
2675 * @param {Number} rollPeriod The number of points over which to average the
2678 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2679 if (originalData
.length
< 2)
2680 return originalData
;
2681 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2682 var rollingData
= [];
2683 var sigma
= this.attr_("sigma");
2685 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2686 if (this.fractions_
) {
2688 var den
= 0; // numerator/denominator
2690 for (i
= 0; i
< originalData
.length
; i
++) {
2691 num
+= originalData
[i
][1][0];
2692 den
+= originalData
[i
][1][1];
2693 if (i
- rollPeriod
>= 0) {
2694 num
-= originalData
[i
- rollPeriod
][1][0];
2695 den
-= originalData
[i
- rollPeriod
][1][1];
2698 var date
= originalData
[i
][0];
2699 var value
= den
? num
/ den
: 0.0;
2700 if (this.attr_("errorBars")) {
2701 if (this.attr_("wilsonInterval")) {
2702 // For more details on this confidence interval, see:
2703 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2705 var p
= value
< 0 ? 0 : value
, n
= den
;
2706 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2707 var denom
= 1 + sigma
* sigma
/ den
;
2708 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2709 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2710 rollingData
[i
] = [date
,
2711 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2713 rollingData
[i
] = [date
, [0, 0, 0]];
2716 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2717 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2720 rollingData
[i
] = [date
, mult
* value
];
2723 } else if (this.attr_("customBars")) {
2728 for (i
= 0; i
< originalData
.length
; i
++) {
2729 var data
= originalData
[i
][1];
2731 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2733 if (y
!== null && !isNaN(y
)) {
2739 if (i
- rollPeriod
>= 0) {
2740 var prev
= originalData
[i
- rollPeriod
];
2741 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2749 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2750 1.0 * (mid
- low
) / count
,
2751 1.0 * (high
- mid
) / count
]];
2753 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2757 // Calculate the rolling average for the first rollPeriod - 1 points where
2758 // there is not enough data to roll over the full number of points
2759 if (!this.attr_("errorBars")){
2760 if (rollPeriod
== 1) {
2761 return originalData
;
2764 for (i
= 0; i
< originalData
.length
; i
++) {
2767 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2768 y
= originalData
[j
][1];
2769 if (y
=== null || isNaN(y
)) continue;
2771 sum
+= originalData
[j
][1];
2774 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2776 rollingData
[i
] = [originalData
[i
][0], null];
2781 for (i
= 0; i
< originalData
.length
; i
++) {
2785 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2786 y
= originalData
[j
][1][0];
2787 if (y
=== null || isNaN(y
)) continue;
2789 sum
+= originalData
[j
][1][0];
2790 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2793 stddev
= Math
.sqrt(variance
) / num_ok
;
2794 rollingData
[i
] = [originalData
[i
][0],
2795 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2797 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2807 * Detects the type of the str (date or numeric) and sets the various
2808 * formatting attributes in this.attrs_ based on this type.
2809 * @param {String} str An x value.
2812 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2814 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2815 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2816 str
.indexOf('/') >= 0 ||
2817 isNaN(parseFloat(str
))) {
2819 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2820 // TODO(danvk): remove support for this format.
2825 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2826 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2827 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2828 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2830 /** @private (shut up, jsdoc!) */
2831 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2832 // TODO(danvk): use Dygraph.numberValueFormatter here?
2833 /** @private (shut up, jsdoc!) */
2834 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2835 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2836 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2841 * Parses the value as a floating point number. This is like the parseFloat()
2842 * built-in, but with a few differences:
2843 * - the empty string is parsed as null, rather than NaN.
2844 * - if the string cannot be parsed at all, an error is logged.
2845 * If the string can't be parsed, this method returns null.
2846 * @param {String} x The string to be parsed
2847 * @param {Number} opt_line_no The line number from which the string comes.
2848 * @param {String} opt_line The text of the line from which the string comes.
2852 // Parse the x as a float or return null if it's not a number.
2853 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2854 var val
= parseFloat(x
);
2855 if (!isNaN(val
)) return val
;
2857 // Try to figure out what happeend.
2858 // If the value is the empty string, parse it as null.
2859 if (/^ *$/.test(x
)) return null;
2861 // If it was actually "NaN", return it as NaN.
2862 if (/^ *nan *$/i.test(x
)) return NaN
;
2864 // Looks like a parsing error.
2865 var msg
= "Unable to parse '" + x
+ "' as a number";
2866 if (opt_line
!== null && opt_line_no
!== null) {
2867 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2876 * Parses a string in a special csv format. We expect a csv file where each
2877 * line is a date point, and the first field in each line is the date string.
2878 * We also expect that all remaining fields represent series.
2879 * if the errorBars attribute is set, then interpret the fields as:
2880 * date, series1, stddev1, series2, stddev2, ...
2881 * @param {[Object]} data See above.
2883 * @return [Object] An array with one entry for each row. These entries
2884 * are an array of cells in that row. The first entry is the parsed x-value for
2885 * the row. The second, third, etc. are the y-values. These can take on one of
2886 * three forms, depending on the CSV and constructor parameters:
2888 * 2. [ value, stddev ]
2889 * 3. [ low value, center value, high value ]
2891 Dygraph
.prototype.parseCSV_
= function(data
) {
2893 var lines
= data
.split("\n");
2896 // Use the default delimiter or fall back to a tab if that makes sense.
2897 var delim
= this.attr_('delimiter');
2898 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2903 if (!('labels' in this.user_attrs_
)) {
2904 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2906 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2911 var defaultParserSet
= false; // attempt to auto-detect x value type
2912 var expectedCols
= this.attr_("labels").length
;
2913 var outOfOrder
= false;
2914 for (var i
= start
; i
< lines
.length
; i
++) {
2915 var line
= lines
[i
];
2917 if (line
.length
=== 0) continue; // skip blank lines
2918 if (line
[0] == '#') continue; // skip comment lines
2919 var inFields
= line
.split(delim
);
2920 if (inFields
.length
< 2) continue;
2923 if (!defaultParserSet
) {
2924 this.detectTypeFromString_(inFields
[0]);
2925 xParser
= this.attr_("xValueParser");
2926 defaultParserSet
= true;
2928 fields
[0] = xParser(inFields
[0], this);
2930 // If fractions are expected, parse the numbers as "A/B
"
2931 if (this.fractions_) {
2932 for (j = 1; j < inFields.length; j++) {
2933 // TODO(danvk): figure out an appropriate way to flag parse errors.
2934 vals = inFields[j].split("/");
2935 if (vals.length != 2) {
2936 this.error('Expected fractional "num
/den
" values in CSV data ' +
2937 "but found a value
'" + inFields[j] + "' on line
" +
2938 (1 + i) + " ('" + line + "') which is not of
this form
.");
2941 fields[j] = [this.parseFloat_(vals[0], i, line),
2942 this.parseFloat_(vals[1], i, line)];
2945 } else if (this.attr_("errorBars
")) {
2946 // If there are error bars, values are (value, stddev) pairs
2947 if (inFields.length % 2 != 1) {
2948 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2949 'but line ' + (1 + i) + ' has an odd number of values (' +
2950 (inFields.length - 1) + "): '" + line + "'");
2952 for (j = 1; j < inFields.length; j += 2) {
2953 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2954 this.parseFloat_(inFields[j + 1], i, line)];
2956 } else if (this.attr_("customBars
")) {
2957 // Bars are a low;center;high tuple
2958 for (j = 1; j < inFields.length; j++) {
2959 var val = inFields[j];
2960 if (/^ *$/.test(val)) {
2961 fields[j] = [null, null, null];
2963 vals = val.split(";");
2964 if (vals.length == 3) {
2965 fields[j] = [ this.parseFloat_(vals[0], i, line),
2966 this.parseFloat_(vals[1], i, line),
2967 this.parseFloat_(vals[2], i, line) ];
2969 this.warn('When using customBars, values must be either blank ' +
2970 'or "low
;center
;high
" tuples (got "' + val +
2971 '" on line ' + (1+i));
2976 // Values are just numbers
2977 for (j = 1; j < inFields.length; j++) {
2978 fields[j] = this.parseFloat_(inFields[j], i, line);
2981 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2985 if (fields.length != expectedCols) {
2986 this.error("Number of columns
in line
" + i + " (" + fields.length +
2987 ") does not agree
with number of
labels (" + expectedCols +
2991 // If the user specified the 'labels' option and none of the cells of the
2992 // first row parsed correctly, then they probably double-specified the
2993 // labels. We go with the values set in the option, discard this row and
2994 // log a warning to the JS console.
2995 if (i === 0 && this.attr_('labels')) {
2996 var all_null = true;
2997 for (j = 0; all_null && j < fields.length; j++) {
2998 if (fields[j]) all_null = false;
3001 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3002 "CSV
data ('" + line + "') appears to also contain labels
. " +
3003 "Will drop the CSV labels and
use the option labels
.");
3011 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3012 ret.sort(function(a,b) { return a[0] - b[0]; });
3020 * The user has provided their data as a pre-packaged JS array. If the x values
3021 * are numeric, this is the same as dygraphs' internal format. If the x values
3022 * are dates, we need to convert them from Date objects to ms since epoch.
3023 * @param {[Object]} data
3024 * @return {[Object]} data with numeric x values.
3026 Dygraph.prototype.parseArray_ = function(data) {
3027 // Peek at the first x value to see if it's numeric.
3028 if (data.length === 0) {
3029 this.error("Can
't plot empty data set");
3032 if (data[0].length === 0) {
3033 this.error("Data set cannot contain an empty row");
3038 if (this.attr_("labels") === null) {
3039 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3040 "in the options parameter");
3041 this.attrs_.labels = [ "X" ];
3042 for (i = 1; i < data[0].length; i++) {
3043 this.attrs_.labels.push("Y" + i);
3046 var num_labels = this.attr_("labels");
3047 if (num_labels.length != data[0].length) {
3048 this.error("Mismatch between number of labels (" + num_labels +
3049 ") and number of columns in array (" + data[0].length + ")");
3054 if (Dygraph.isDateLike(data[0][0])) {
3055 // Some intelligent defaults for a date x-axis.
3056 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3057 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3058 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3060 // Assume they're all dates
.
3061 var parsedData
= Dygraph
.clone(data
);
3062 for (i
= 0; i
< data
.length
; i
++) {
3063 if (parsedData
[i
].length
=== 0) {
3064 this.error("Row " + (1 + i
) + " of data is empty");
3067 if (parsedData
[i
][0] === null ||
3068 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3069 isNaN(parsedData
[i
][0].getTime())) {
3070 this.error("x value in row " + (1 + i
) + " is not a Date");
3073 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3077 // Some intelligent defaults for a numeric x-axis.
3078 /** @private (shut up, jsdoc!) */
3079 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3080 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3081 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3087 * Parses a DataTable object from gviz.
3088 * The data is expected to have a first column that is either a date or a
3089 * number. All subsequent columns must be numbers. If there is a clear mismatch
3090 * between this.xValueParser_ and the type of the first column, it will be
3091 * fixed. Fills out rawData_.
3092 * @param {[Object]} data See above.
3095 Dygraph
.prototype.parseDataTable_
= function(data
) {
3096 var shortTextForAnnotationNum
= function(num
) {
3097 // converts [0-9]+ [A-Z][a-z]*
3098 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3099 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3100 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3101 num
= Math
.floor(num
/ 26);
3103 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3104 num
= Math
.floor((num
- 1) / 26);
3109 var cols
= data
.getNumberOfColumns();
3110 var rows
= data
.getNumberOfRows();
3112 var indepType
= data
.getColumnType(0);
3113 if (indepType
== 'date' || indepType
== 'datetime') {
3114 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3115 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3116 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3117 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3118 } else if (indepType
== 'number') {
3119 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3120 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3121 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3122 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3124 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3125 "column 1 of DataTable input (Got '" + indepType
+ "')");
3129 // Array of the column indices which contain data (and not annotations).
3131 var annotationCols
= {}; // data index -> [annotation cols]
3132 var hasAnnotations
= false;
3134 for (i
= 1; i
< cols
; i
++) {
3135 var type
= data
.getColumnType(i
);
3136 if (type
== 'number') {
3138 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3139 // This is OK -- it's an annotation column.
3140 var dataIdx
= colIdx
[colIdx
.length
- 1];
3141 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3142 annotationCols
[dataIdx
] = [i
];
3144 annotationCols
[dataIdx
].push(i
);
3146 hasAnnotations
= true;
3148 this.error("Only 'number' is supported as a dependent type with Gviz." +
3149 " 'string' is only supported if displayAnnotations is true");
3153 // Read column labels
3154 // TODO(danvk): add support back for errorBars
3155 var labels
= [data
.getColumnLabel(0)];
3156 for (i
= 0; i
< colIdx
.length
; i
++) {
3157 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3158 if (this.attr_("errorBars")) i
+= 1;
3160 this.attrs_
.labels
= labels
;
3161 cols
= labels
.length
;
3164 var outOfOrder
= false;
3165 var annotations
= [];
3166 for (i
= 0; i
< rows
; i
++) {
3168 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3169 data
.getValue(i
, 0) === null) {
3170 this.warn("Ignoring row " + i
+
3171 " of DataTable because of undefined or null first column.");
3175 if (indepType
== 'date' || indepType
== 'datetime') {
3176 row
.push(data
.getValue(i
, 0).getTime());
3178 row
.push(data
.getValue(i
, 0));
3180 if (!this.attr_("errorBars")) {
3181 for (j
= 0; j
< colIdx
.length
; j
++) {
3182 var col
= colIdx
[j
];
3183 row
.push(data
.getValue(i
, col
));
3184 if (hasAnnotations
&&
3185 annotationCols
.hasOwnProperty(col
) &&
3186 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3188 ann
.series
= data
.getColumnLabel(col
);
3190 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3192 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3193 if (k
) ann
.text
+= "\n";
3194 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3196 annotations
.push(ann
);
3200 // Strip out infinities, which give dygraphs problems later on.
3201 for (j
= 0; j
< row
.length
; j
++) {
3202 if (!isFinite(row
[j
])) row
[j
] = null;
3205 for (j
= 0; j
< cols
- 1; j
++) {
3206 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3209 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3216 this.warn("DataTable is out of order; order it correctly to speed loading.");
3217 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3219 this.rawData_
= ret
;
3221 if (annotations
.length
> 0) {
3222 this.setAnnotations(annotations
, true);
3227 * Get the CSV data. If it's in a function, call that function. If it's in a
3228 * file, do an XMLHttpRequest to get it.
3231 Dygraph
.prototype.start_
= function() {
3232 var data
= this.file_
;
3234 // Functions can return references of all other types.
3235 if (typeof data
== 'function') {
3239 if (Dygraph
.isArrayLike(data
)) {
3240 this.rawData_
= this.parseArray_(data
);
3242 } else if (typeof data
== 'object' &&
3243 typeof data
.getColumnRange
== 'function') {
3244 // must be a DataTable from gviz.
3245 this.parseDataTable_(data
);
3247 } else if (typeof data
== 'string') {
3248 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3249 if (data
.indexOf('\n') >= 0) {
3250 this.loadedEvent_(data
);
3252 var req
= new XMLHttpRequest();
3254 req
.onreadystatechange
= function () {
3255 if (req
.readyState
== 4) {
3256 if (req
.status
=== 200 || // Normal http
3257 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3258 caller
.loadedEvent_(req
.responseText
);
3263 req
.open("GET", data
, true);
3267 this.error("Unknown data format: " + (typeof data
));
3272 * Changes various properties of the graph. These can include:
3274 * <li>file: changes the source data for the graph</li>
3275 * <li>errorBars: changes whether the data contains stddev</li>
3278 * There's a huge variety of options that can be passed to this method. For a
3279 * full list, see http://dygraphs.com/options.html.
3281 * @param {Object} attrs The new properties and values
3282 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3283 * call to updateOptions(). If you know better, you can pass true to explicitly
3284 * block the redraw. This can be useful for chaining updateOptions() calls,
3285 * avoiding the occasional infinite loop and preventing redraws when it's not
3286 * necessary (e.g. when updating a callback).
3288 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3289 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3291 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3292 var file
= input_attrs
.file
;
3293 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3295 // TODO(danvk): this is a mess. Move these options into attr_.
3296 if ('rollPeriod' in attrs
) {
3297 this.rollPeriod_
= attrs
.rollPeriod
;
3299 if ('dateWindow' in attrs
) {
3300 this.dateWindow_
= attrs
.dateWindow
;
3301 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3302 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3305 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3306 this.zoomed_y_
= (attrs
.valueRange
!== null);
3309 // TODO(danvk): validate per-series options.
3314 // highlightCircleSize
3316 // Check if this set options will require new points.
3317 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3319 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3323 if (!block_redraw
) this.start_();
3325 if (!block_redraw
) {
3326 if (requiresNewPoints
) {
3329 this.renderGraph_(false);
3336 * Returns a copy of the options with deprecated names converted into current
3337 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3338 * interested in that, they should save a copy before calling this.
3341 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3343 for (var k
in attrs
) {
3344 if (k
== 'file') continue;
3345 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3348 var set
= function(axis
, opt
, value
) {
3349 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3350 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3351 my_attrs
.axes
[axis
][opt
] = value
;
3353 var map
= function(opt
, axis
, new_opt
) {
3354 if (typeof(attrs
[opt
]) != 'undefined') {
3355 set(axis
, new_opt
, attrs
[opt
]);
3356 delete my_attrs
[opt
];
3360 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3361 map('xValueFormatter', 'x', 'valueFormatter');
3362 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3363 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3364 map('xTicker', 'x', 'ticker');
3365 map('yValueFormatter', 'y', 'valueFormatter');
3366 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3367 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3368 map('yTicker', 'y', 'ticker');
3373 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3374 * containing div (which has presumably changed size since the dygraph was
3375 * instantiated. If the width/height are specified, the div will be resized.
3377 * This is far more efficient than destroying and re-instantiating a
3378 * Dygraph, since it doesn't have to reparse the underlying data.
3380 * @param {Number} [width] Width (in pixels)
3381 * @param {Number} [height] Height (in pixels)
3383 Dygraph
.prototype.resize
= function(width
, height
) {
3384 if (this.resize_lock
) {
3387 this.resize_lock
= true;
3389 if ((width
=== null) != (height
=== null)) {
3390 this.warn("Dygraph.resize() should be called with zero parameters or " +
3391 "two non-NULL parameters. Pretending it was zero.");
3392 width
= height
= null;
3395 var old_width
= this.width_
;
3396 var old_height
= this.height_
;
3399 this.maindiv_
.style
.width
= width
+ "px";
3400 this.maindiv_
.style
.height
= height
+ "px";
3401 this.width_
= width
;
3402 this.height_
= height
;
3404 this.width_
= this.maindiv_
.clientWidth
;
3405 this.height_
= this.maindiv_
.clientHeight
;
3408 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3409 // TODO(danvk): there should be a clear() method.
3410 this.maindiv_
.innerHTML
= "";
3411 this.roller_
= null;
3412 this.attrs_
.labelsDiv
= null;
3413 this.createInterface_();
3414 if (this.annotations_
.length
) {
3415 // createInterface_ reset the layout, so we need to do this.
3416 this.layout_
.setAnnotations(this.annotations_
);
3421 this.resize_lock
= false;
3425 * Adjusts the number of points in the rolling average. Updates the graph to
3426 * reflect the new averaging period.
3427 * @param {Number} length Number of points over which to average the data.
3429 Dygraph
.prototype.adjustRoll
= function(length
) {
3430 this.rollPeriod_
= length
;
3435 * Returns a boolean array of visibility statuses.
3437 Dygraph
.prototype.visibility
= function() {
3438 // Do lazy-initialization, so that this happens after we know the number of
3440 if (!this.attr_("visibility")) {
3441 this.attrs_
.visibility
= [];
3443 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3444 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3445 this.attrs_
.visibility
.push(true);
3447 return this.attr_("visibility");
3451 * Changes the visiblity of a series.
3453 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3454 var x
= this.visibility();
3455 if (num
< 0 || num
>= x
.length
) {
3456 this.warn("invalid series number in setVisibility: " + num
);
3464 * How large of an area will the dygraph render itself in?
3465 * This is used for testing.
3466 * @return A {width: w, height: h} object.
3469 Dygraph
.prototype.size
= function() {
3470 return { width
: this.width_
, height
: this.height_
};
3474 * Update the list of annotations and redraw the chart.
3475 * See dygraphs.com/annotations.html for more info on how to use annotations.
3476 * @param ann {Array} An array of annotation objects.
3477 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3479 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3480 // Only add the annotation CSS rule once we know it will be used.
3481 Dygraph
.addAnnotationRule();
3482 this.annotations_
= ann
;
3483 this.layout_
.setAnnotations(this.annotations_
);
3484 if (!suppressDraw
) {
3490 * Return the list of annotations.
3492 Dygraph
.prototype.annotations
= function() {
3493 return this.annotations_
;
3497 * Get the list of label names for this graph. The first column is the
3498 * x-axis, so the data series names start at index 1.
3500 Dygraph
.prototype.getLabels
= function() {
3501 return this.attr_("labels").slice();
3505 * Get the index of a series (column) given its name. The first column is the
3506 * x-axis, so the data series start with index 1.
3508 Dygraph
.prototype.indexFromSetName
= function(name
) {
3509 return this.setIndexByName_
[name
];
3513 * Get the internal dataset index given its name. These are numbered starting from 0,
3514 * and only count visible sets.
3517 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3518 return this.datasetIndex_
[this.indexFromSetName(name
)];
3523 * Adds a default style for the annotation CSS classes to the document. This is
3524 * only executed when annotations are actually used. It is designed to only be
3525 * called once -- all calls after the first will return immediately.
3527 Dygraph
.addAnnotationRule
= function() {
3528 // TODO(danvk): move this function into plugins/annotations.js
?
3529 if (Dygraph
.addedAnnotationCSS
) return;
3531 var rule
= "border: 1px solid black; " +
3532 "background-color: white; " +
3533 "text-align: center;";
3535 var styleSheetElement
= document
.createElement("style");
3536 styleSheetElement
.type
= "text/css";
3537 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3539 // Find the first style sheet that we can access.
3540 // We may not add a rule to a style sheet from another domain for security
3541 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3542 // adds its own style sheets from google.com.
3543 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3544 if (document
.styleSheets
[i
].disabled
) continue;
3545 var mysheet
= document
.styleSheets
[i
];
3547 if (mysheet
.insertRule
) { // Firefox
3548 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3549 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3550 } else if (mysheet
.addRule
) { // IE
3551 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3553 Dygraph
.addedAnnotationCSS
= true;
3556 // Was likely a security exception.
3560 this.warn("Unable to add default annotation CSS rule; display may be off.");
3563 // Older pages may still use this name.
3564 var DateGraph
= Dygraph
;