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 DygraphLayout:false, DygraphCanvasRenderer:false, G_vmlCanvasManager:false */
51 * Creates an interactive, zoomable chart.
54 * @param {div | String} div A div or the id of a div into which to construct
56 * @param {String | Function} file A file containing CSV data or a function
57 * that returns this data. The most basic expected format for each line is
58 * "YYYY/MM/DD,val1,val2,...". For more information, see
59 * http://dygraphs.com/data.html.
60 * @param {Object} attrs Various other attributes, e.g. errorBars determines
61 * whether the input data contains error ranges. For a complete list of
62 * options, see http://dygraphs.com/options.html.
64 var Dygraph
= function(div
, data
, opts
, opt_fourth_param
) {
65 if (opt_fourth_param
!== undefined
) {
66 // Old versions of dygraphs took in the series labels as a constructor
67 // parameter. This doesn't make sense anymore, but it's easy to continue
68 // to support this usage.
69 this.warn("Using deprecated four-argument dygraph constructor");
70 this.__old_init__(div
, data
, opts
, opt_fourth_param
);
72 this.__init__(div
, data
, opts
);
76 Dygraph
.NAME
= "Dygraph";
77 Dygraph
.VERSION
= "1.2";
78 Dygraph
.__repr__
= function() {
79 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
83 * Returns information about the Dygraph class.
85 Dygraph
.toString
= function() {
86 return this.__repr__();
89 // Various default values
90 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
91 Dygraph
.DEFAULT_WIDTH
= 480;
92 Dygraph
.DEFAULT_HEIGHT
= 320;
94 // For max 60 Hz. animation:
95 Dygraph
.ANIMATION_STEPS
= 12;
96 Dygraph
.ANIMATION_DURATION
= 200;
98 // These are defined before DEFAULT_ATTRS so that it can refer to them.
101 * Return a string version of a number. This respects the digitsAfterDecimal
102 * and maxNumberWidth options.
103 * @param {Number} x The number to be formatted
104 * @param {Dygraph} opts An options view
105 * @param {String} name The name of the point's data series
106 * @param {Dygraph} g The dygraph object
108 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
109 var sigFigs
= opts('sigFigs');
111 if (sigFigs
!== null) {
112 // User has opted for a fixed number of significant figures.
113 return Dygraph
.floatFormat(x
, sigFigs
);
116 var digits
= opts('digitsAfterDecimal');
117 var maxNumberWidth
= opts('maxNumberWidth');
119 // switch to scientific notation if we underflow or overflow fixed display.
121 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
122 Math
.abs(x
) < Math
.pow(10, -digits
))) {
123 return x
.toExponential(digits
);
125 return '' + Dygraph
.round_(x
, digits
);
130 * variant for use as an axisLabelFormatter.
133 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
134 return Dygraph
.numberValueFormatter(x
, opts
, g
);
138 * Convert a JS date (millis since epoch) to YYYY/MM/DD
139 * @param {Number} date The JavaScript date (ms since epoch)
140 * @return {String} A date of the form "YYYY/MM/DD"
143 Dygraph
.dateString_
= function(date
) {
144 var zeropad
= Dygraph
.zeropad
;
145 var d
= new Date(date
);
148 var year
= "" + d
.getFullYear();
149 // Get a 0 padded month string
150 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
151 // Get a 0 padded day string
152 var day
= zeropad(d
.getDate());
155 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
156 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
158 return year
+ "/" + month + "/" + day
+ ret
;
162 * Convert a JS date to a string appropriate to display on an axis that
163 * is displaying values at the stated granularity.
164 * @param {Date} date The date to format
165 * @param {Number} granularity One of the Dygraph granularity constants
166 * @return {String} The formatted date
169 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
170 if (granularity
>= Dygraph
.DECADAL
) {
171 return date
.strftime('%Y');
172 } else if (granularity
>= Dygraph
.MONTHLY
) {
173 return date
.strftime('%b %y');
175 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
176 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
177 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
179 return Dygraph
.hmsString_(date
.getTime());
185 * Standard plotters. These may be used by clients.
186 * Available plotters are:
187 * - Dygraph.Plotters.linePlotter: draws central lines (most common)
188 * - Dygraph.Plotters.errorPlotter: draws error bars
189 * - Dygraph.Plotters.fillPlotter: draws fills under lines (used with fillGraph)
191 * By default, the plotter is [fillPlotter, errorPlotter, linePlotter].
192 * This causes all the lines to be drawn over all the fills/error bars.
194 Dygraph
.Plotters
= DygraphCanvasRenderer
._Plotters
;
197 // Default attribute values.
198 Dygraph
.DEFAULT_ATTRS
= {
199 highlightCircleSize
: 3,
200 highlightSeriesOpts
: null,
201 highlightSeriesBackgroundAlpha
: 0.5,
205 // TODO(danvk): move defaults from createStatusMessage_ here.
207 labelsSeparateLines
: false,
208 labelsShowZeroValues
: true,
211 showLabelsOnHighlight
: true,
213 digitsAfterDecimal
: 2,
218 strokeBorderWidth
: 0,
219 strokeBorderColor
: "white",
222 axisLabelFontSize
: 14,
228 xValueParser
: Dygraph
.dateParser
,
235 wilsonInterval
: true, // only relevant if fractions is true
239 connectSeparatedPoints
: false,
242 hideOverlayOnMouseOut
: true,
244 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
245 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
249 drawAxesAtZero
: false,
251 // Sizes of the various chart labels.
258 axisLineColor
: "black",
261 axisLabelColor
: "black",
262 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
266 gridLineColor
: "rgb(128,128,128)",
268 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
269 animatedZooms
: false, // (for now)
271 // Range selector options
272 showRangeSelector
: false,
273 rangeSelectorHeight
: 40,
274 rangeSelectorPlotStrokeColor
: "#808FAB",
275 rangeSelectorPlotFillColor
: "#A7B1C4",
277 // The ordering here ensures that central lines always appear above any
278 // fill bars/error bars
.
280 Dygraph
.Plotters
.fillPlotter
,
281 Dygraph
.Plotters
.errorPlotter
,
282 Dygraph
.Plotters
.linePlotter
291 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
292 valueFormatter
: Dygraph
.dateString_
,
293 ticker
: null // will be set in dygraph-tickers.js
297 valueFormatter
: Dygraph
.numberValueFormatter
,
298 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
299 ticker
: null // will be set in dygraph-tickers.js
303 valueFormatter
: Dygraph
.numberValueFormatter
,
304 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
305 ticker
: null // will be set in dygraph-tickers.js
310 // Directions for panning and zooming. Use bit operations when combined
311 // values are possible.
312 Dygraph
.HORIZONTAL
= 1;
313 Dygraph
.VERTICAL
= 2;
315 // Installed plugins, in order of precedence (most-general to most-specific).
316 // Plugins are installed after they are defined, in plugins/install.js
.
320 // Used for initializing annotation CSS rules only once.
321 Dygraph
.addedAnnotationCSS
= false;
323 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
324 // Labels is no longer a constructor parameter, since it's typically set
325 // directly from the data source. It also conains a name for the x-axis,
326 // which the previous constructor form did not.
327 if (labels
!== null) {
328 var new_labels
= ["Date"];
329 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
330 Dygraph
.update(attrs
, { 'labels': new_labels
});
332 this.__init__(div
, file
, attrs
);
336 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
337 * and context <canvas> inside of it. See the constructor for details.
339 * @param {Element} div the Element to render the graph into.
340 * @param {String | Function} file Source data
341 * @param {Object} attrs Miscellaneous other options
344 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
345 // Hack for IE: if we're using excanvas and the document hasn't finished
346 // loading yet (and hence may not have initialized whatever it needs to
347 // initialize), then keep calling this routine periodically until it has.
348 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
349 typeof(G_vmlCanvasManager
) != 'undefined' &&
350 document
.readyState
!= 'complete') {
352 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
356 // Support two-argument constructor
357 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
359 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
361 if (typeof(div
) == 'string') {
362 div
= document
.getElementById(div
);
366 Dygraph
.error("Constructing dygraph with a non-existent div!");
370 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
372 // Copy the important bits into the object
373 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
376 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
377 this.previousVerticalX_
= -1;
378 this.fractions_
= attrs
.fractions
|| false;
379 this.dateWindow_
= attrs
.dateWindow
|| null;
381 this.is_initial_draw_
= true;
382 this.annotations_
= [];
384 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
385 this.zoomed_x_
= false;
386 this.zoomed_y_
= false;
388 // Clear the div. This ensure that, if multiple dygraphs are passed the same
389 // div, then only one will be drawn.
392 // For historical reasons, the 'width' and 'height' options trump all CSS
393 // rules _except_ for an explicit 'width' or 'height' on the div.
394 // As an added convenience, if the div has zero height (like <div></div> does
395 // without any styles), then we use a default height/width
.
396 if (div
.style
.width
=== '' && attrs
.width
) {
397 div
.style
.width
= attrs
.width
+ "px";
399 if (div
.style
.height
=== '' && attrs
.height
) {
400 div
.style
.height
= attrs
.height
+ "px";
402 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
403 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
404 if (div
.style
.width
=== '') {
405 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
408 // these will be zero if the dygraph's div is hidden.
409 this.width_
= div
.clientWidth
;
410 this.height_
= div
.clientHeight
;
412 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
413 if (attrs
.stackedGraph
) {
414 attrs
.fillGraph
= true;
415 // TODO(nikhilk): Add any other stackedGraph checks here.
418 // DEPRECATION WARNING: All option processing should be moved from
419 // attrs_ and user_attrs_ to options_, which holds all this information.
421 // Dygraphs has many options, some of which interact with one another.
422 // To keep track of everything, we maintain two sets of options:
424 // this.user_attrs_ only options explicitly set by the user.
425 // this.attrs_ defaults, options derived from user_attrs_, data.
427 // Options are then accessed this.attr_('attr'), which first looks at
428 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
429 // defaults without overriding behavior that the user specifically asks for.
430 this.user_attrs_
= {};
431 Dygraph
.update(this.user_attrs_
, attrs
);
433 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
435 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
437 this.boundaryIds_
= [];
438 this.setIndexByName_
= {};
439 this.datasetIndex_
= [];
441 this.registeredEvents_
= [];
442 this.eventListeners_
= {};
444 this.attributes_
= new DygraphOptions(this);
446 // Create the containing DIV and other interactive elements
447 this.createInterface_();
451 var plugins
= Dygraph
.PLUGINS
.concat(this.getOption('plugins'));
452 for (var i
= 0; i
< plugins
.length
; i
++) {
453 var Plugin
= plugins
[i
];
454 var pluginInstance
= new Plugin();
456 plugin
: pluginInstance
,
462 var handlers
= pluginInstance
.activate(this);
463 for (var eventName
in handlers
) {
464 // TODO(danvk): validate eventName.
465 pluginDict
.events
[eventName
] = handlers
[eventName
];
468 this.plugins_
.push(pluginDict
);
471 // At this point, plugins can no longer register event handlers.
472 // Construct a map from event -> ordered list of [callback, plugin].
473 for (var i
= 0; i
< this.plugins_
.length
; i
++) {
474 var plugin_dict
= this.plugins_
[i
];
475 for (var eventName
in plugin_dict
.events
) {
476 if (!plugin_dict
.events
.hasOwnProperty(eventName
)) continue;
477 var callback
= plugin_dict
.events
[eventName
];
479 var pair
= [plugin_dict
.plugin
, callback
];
480 if (!(eventName
in this.eventListeners_
)) {
481 this.eventListeners_
[eventName
] = [pair
];
483 this.eventListeners_
[eventName
].push(pair
);
492 * Triggers a cascade of events to the various plugins which are interested in them.
493 * Returns true if the "default behavior" should be performed, i.e. if none of
494 * the event listeners called event.preventDefault().
497 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
498 if (!(name
in this.eventListeners_
)) return true;
500 // QUESTION: can we use objects & prototypes to speed this up?
504 defaultPrevented
: false,
505 preventDefault
: function() {
506 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
507 e
.defaultPrevented
= true;
509 propagationStopped
: false,
510 stopPropagation
: function() {
511 e
.propagationStopped
= true;
514 Dygraph
.update(e
, extra_props
);
516 var callback_plugin_pairs
= this.eventListeners_
[name
];
517 if (callback_plugin_pairs
) {
518 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
519 var plugin
= callback_plugin_pairs
[i
][0];
520 var callback
= callback_plugin_pairs
[i
][1];
521 callback
.call(plugin
, e
);
522 if (e
.propagationStopped
) break;
525 return e
.defaultPrevented
;
529 * Returns the zoomed status of the chart for one or both axes.
531 * Axis is an optional parameter. Can be set to 'x' or 'y'.
533 * The zoomed status for an axis is set whenever a user zooms using the mouse
534 * or when the dateWindow or valueRange are updated (unless the
535 * isZoomedIgnoreProgrammaticZoom option is also specified).
537 Dygraph
.prototype.isZoomed
= function(axis
) {
538 if (axis
=== null || axis
=== undefined
) {
539 return this.zoomed_x_
|| this.zoomed_y_
;
541 if (axis
=== 'x') return this.zoomed_x_
;
542 if (axis
=== 'y') return this.zoomed_y_
;
543 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
547 * Returns information about the Dygraph object, including its containing ID.
549 Dygraph
.prototype.toString
= function() {
550 var maindiv
= this.maindiv_
;
551 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
552 return "[Dygraph " + id
+ "]";
557 * Returns the value of an option. This may be set by the user (either in the
558 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
560 * @param { String } name The name of the option, e.g. 'rollPeriod'.
561 * @param { String } [seriesName] The name of the series to which the option
562 * will be applied. If no per-series value of this option is available, then
563 * the global value is returned. This is optional.
564 * @return { ... } The value of the option.
566 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
567 // <REMOVE_FOR_COMBINED>
568 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
569 this.error('Must include options reference JS for testing');
570 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
571 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
572 'in the Dygraphs.OPTIONS_REFERENCE listing.');
573 // Only log this error once.
574 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
576 // </REMOVE_FOR_COMBINED
>
577 return seriesName
? this.attributes_
.getForSeries(name
, seriesName
) : this.attributes_
.get(name
);
581 * Returns the current value for an option, as set in the constructor or via
582 * updateOptions. You may pass in an (optional) series name to get per-series
583 * values for the option.
585 * All values returned by this method should be considered immutable. If you
586 * modify them, there is no guarantee that the changes will be honored or that
587 * dygraphs will remain in a consistent state. If you want to modify an option,
588 * use updateOptions() instead.
590 * @param { String } name The name of the option (e.g. 'strokeWidth')
591 * @param { String } [opt_seriesName] Series name to get per-series values.
592 * @return { ... } The value of the option.
594 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
595 return this.attr_(name
, opt_seriesName
);
598 Dygraph
.prototype.getOptionForAxis
= function(name
, axis
) {
599 return this.attributes_
.getForAxis(name
, axis
);
603 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
604 * @return { ... } A function mapping string -> option value
606 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
608 return function(opt
) {
609 var axis_opts
= self
.user_attrs_
.axes
;
610 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
611 return axis_opts
[axis
][opt
];
613 // user-specified attributes always trump defaults, even if they're less
615 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
616 return self
.user_attrs_
[opt
];
619 axis_opts
= self
.attrs_
.axes
;
620 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
621 return axis_opts
[axis
][opt
];
623 // check old-style axis options
624 // TODO(danvk): add a deprecation warning if either of these match.
625 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
626 return self
.axes_
[0][opt
];
627 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
628 return self
.axes_
[1][opt
];
630 return self
.attr_(opt
);
635 * Returns the current rolling period, as set by the user or an option.
636 * @return {Number} The number of points in the rolling window
638 Dygraph
.prototype.rollPeriod
= function() {
639 return this.rollPeriod_
;
643 * Returns the currently-visible x-range. This can be affected by zooming,
644 * panning or a call to updateOptions.
645 * Returns a two-element array: [left, right].
646 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
648 Dygraph
.prototype.xAxisRange
= function() {
649 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
653 * Returns the lower- and upper-bound x-axis values of the
656 Dygraph
.prototype.xAxisExtremes
= function() {
657 var left
= this.rawData_
[0][0];
658 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
659 return [left
, right
];
663 * Returns the currently-visible y-range for an axis. This can be affected by
664 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
665 * called with no arguments, returns the range of the first axis.
666 * Returns a two-element array: [bottom, top].
668 Dygraph
.prototype.yAxisRange
= function(idx
) {
669 if (typeof(idx
) == "undefined") idx
= 0;
670 if (idx
< 0 || idx
>= this.axes_
.length
) {
673 var axis
= this.axes_
[idx
];
674 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
678 * Returns the currently-visible y-ranges for each axis. This can be affected by
679 * zooming, panning, calls to updateOptions, etc.
680 * Returns an array of [bottom, top] pairs, one for each y-axis.
682 Dygraph
.prototype.yAxisRanges
= function() {
684 for (var i
= 0; i
< this.axes_
.length
; i
++) {
685 ret
.push(this.yAxisRange(i
));
690 // TODO(danvk): use these functions throughout dygraphs.
692 * Convert from data coordinates to canvas/div X/Y coordinates.
693 * If specified, do this conversion for the coordinate system of a particular
694 * axis. Uses the first axis by default.
695 * Returns a two-element array: [X, Y]
697 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
698 * instead of toDomCoords(null, y, axis).
700 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
701 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
705 * Convert from data x coordinates to canvas/div X coordinate.
706 * If specified, do this conversion for the coordinate system of a particular
708 * Returns a single value or null if x is null.
710 Dygraph
.prototype.toDomXCoord
= function(x
) {
715 var area
= this.plotter_
.area
;
716 var xRange
= this.xAxisRange();
717 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
721 * Convert from data x coordinates to canvas/div Y coordinate and optional
722 * axis. Uses the first axis by default.
724 * returns a single value or null if y is null.
726 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
727 var pct
= this.toPercentYCoord(y
, axis
);
732 var area
= this.plotter_
.area
;
733 return area
.y
+ pct
* area
.h
;
737 * Convert from canvas/div coords to data coordinates.
738 * If specified, do this conversion for the coordinate system of a particular
739 * axis. Uses the first axis by default.
740 * Returns a two-element array: [X, Y].
742 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
743 * instead of toDataCoords(null, y, axis).
745 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
746 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
750 * Convert from canvas/div x coordinate to data coordinate.
752 * If x is null, this returns null.
754 Dygraph
.prototype.toDataXCoord
= function(x
) {
759 var area
= this.plotter_
.area
;
760 var xRange
= this.xAxisRange();
761 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
765 * Convert from canvas/div y coord to value.
767 * If y is null, this returns null.
768 * if axis is null, this uses the first axis.
770 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
775 var area
= this.plotter_
.area
;
776 var yRange
= this.yAxisRange(axis
);
778 if (typeof(axis
) == "undefined") axis
= 0;
779 if (!this.axes_
[axis
].logscale
) {
780 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
782 // Computing the inverse of toDomCoord.
783 var pct
= (y
- area
.y
) / area
.h
;
785 // Computing the inverse of toPercentYCoord. The function was arrived at with
786 // the following steps:
788 // Original calcuation:
789 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
791 // Move denominator to both sides:
792 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
794 // subtract logr1, and take the negative value.
795 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
797 // Swap both sides of the equation, and we can compute the log of the
798 // return value. Which means we just need to use that as the exponent in
800 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
802 var logr1
= Dygraph
.log10(yRange
[1]);
803 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
804 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
810 * Converts a y for an axis to a percentage from the top to the
811 * bottom of the drawing area.
813 * If the coordinate represents a value visible on the canvas, then
814 * the value will be between 0 and 1, where 0 is the top of the canvas.
815 * However, this method will return values outside the range, as
816 * values can fall outside the canvas.
818 * If y is null, this returns null.
819 * if axis is null, this uses the first axis.
821 * @param { Number } y The data y-coordinate.
822 * @param { Number } [axis] The axis number on which the data coordinate lives.
823 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
825 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
829 if (typeof(axis
) == "undefined") axis
= 0;
831 var yRange
= this.yAxisRange(axis
);
834 var logscale
= this.attributes_
.getForAxis("logscale", axis
);
836 // yRange[1] - y is unit distance from the bottom.
837 // yRange[1] - yRange[0] is the scale of the range.
838 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
839 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
841 var logr1
= Dygraph
.log10(yRange
[1]);
842 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
848 * Converts an x value to a percentage from the left to the right of
851 * If the coordinate represents a value visible on the canvas, then
852 * the value will be between 0 and 1, where 0 is the left of the canvas.
853 * However, this method will return values outside the range, as
854 * values can fall outside the canvas.
856 * If x is null, this returns null.
857 * @param { Number } x The data x-coordinate.
858 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
860 Dygraph
.prototype.toPercentXCoord
= function(x
) {
865 var xRange
= this.xAxisRange();
866 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
870 * Returns the number of columns (including the independent variable).
871 * @return { Integer } The number of columns.
873 Dygraph
.prototype.numColumns
= function() {
874 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
878 * Returns the number of rows (excluding any header/label row).
879 * @return { Integer } The number of rows, less any header.
881 Dygraph
.prototype.numRows
= function() {
882 return this.rawData_
.length
;
886 * Returns the full range of the x-axis, as determined by the most extreme
887 * values in the data set. Not affected by zooming, visibility, etc.
888 * TODO(danvk): merge w/ xAxisExtremes
889 * @return { Array<Number> } A [low, high] pair
892 Dygraph
.prototype.fullXRange_
= function() {
893 if (this.numRows() > 0) {
894 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
901 * Returns the value in the given row and column. If the row and column exceed
902 * the bounds on the data, returns null. Also returns null if the value is
904 * @param { Number} row The row number of the data (0-based). Row 0 is the
905 * first row of data, not a header row.
906 * @param { Number} col The column number of the data (0-based)
907 * @return { Number } The value in the specified cell or null if the row/col
910 Dygraph
.prototype.getValue
= function(row
, col
) {
911 if (row
< 0 || row
> this.rawData_
.length
) return null;
912 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
914 return this.rawData_
[row
][col
];
918 * Generates interface elements for the Dygraph: a containing div, a div to
919 * display the current point, and a textbox to adjust the rolling average
920 * period. Also creates the Renderer/Layout elements.
923 Dygraph
.prototype.createInterface_
= function() {
924 // Create the all-enclosing graph div
925 var enclosing
= this.maindiv_
;
927 this.graphDiv
= document
.createElement("div");
928 this.graphDiv
.style
.width
= this.width_
+ "px";
929 this.graphDiv
.style
.height
= this.height_
+ "px";
930 enclosing
.appendChild(this.graphDiv
);
932 // Create the canvas for interactive parts of the chart.
933 this.canvas_
= Dygraph
.createCanvas();
934 this.canvas_
.style
.position
= "absolute";
935 this.canvas_
.width
= this.width_
;
936 this.canvas_
.height
= this.height_
;
937 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
938 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
940 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
942 // ... and for static parts of the chart.
943 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
944 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
946 // The interactive parts of the graph are drawn on top of the chart.
947 this.graphDiv
.appendChild(this.hidden_
);
948 this.graphDiv
.appendChild(this.canvas_
);
949 this.mouseEventElement_
= this.createMouseEventElement_();
951 // Create the grapher
952 this.layout_
= new DygraphLayout(this);
956 this.mouseMoveHandler
= function(e
) {
957 dygraph
.mouseMove_(e
);
959 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
961 this.mouseOutHandler
= function(e
) {
962 dygraph
.mouseOut_(e
);
964 this.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
966 this.createDragInterface_();
968 this.resizeHandler
= function(e
) {
972 // Update when the window is resized.
973 // TODO(danvk): drop frames depending on complexity of the chart.
974 this.addEvent(window
, 'resize', this.resizeHandler
);
978 * Detach DOM elements in the dygraph and null out all data references.
979 * Calling this when you're done with a dygraph can dramatically reduce memory
980 * usage. See, e.g., the tests/perf.html example.
982 Dygraph
.prototype.destroy
= function() {
983 var removeRecursive
= function(node
) {
984 while (node
.hasChildNodes()) {
985 removeRecursive(node
.firstChild
);
986 node
.removeChild(node
.firstChild
);
990 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
991 var reg
= this.registeredEvents_
[idx
];
992 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
994 this.registeredEvents_
= [];
996 // remove mouse event handlers (This may not be necessary anymore)
997 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
998 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
999 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
1000 removeRecursive(this.maindiv_
);
1002 var nullOut
= function(obj
) {
1003 for (var n
in obj
) {
1004 if (typeof(obj
[n
]) === 'object') {
1009 // remove event handlers
1010 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
1011 this.resizeHandler
= null;
1012 // These may not all be necessary, but it can't hurt...
1013 nullOut(this.layout_
);
1014 nullOut(this.plotter_
);
1019 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1020 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1021 * or the zoom rectangles) is done on this.canvas_.
1022 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1023 * @return {Object} The newly-created canvas
1026 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1027 var h
= Dygraph
.createCanvas();
1028 h
.style
.position
= "absolute";
1029 // TODO(danvk): h should be offset from canvas. canvas needs to include
1030 // some extra area to make it easier to zoom in on the far left and far
1031 // right. h needs to be precisely the plot area, so that clipping occurs.
1032 h
.style
.top
= canvas
.style
.top
;
1033 h
.style
.left
= canvas
.style
.left
;
1034 h
.width
= this.width_
;
1035 h
.height
= this.height_
;
1036 h
.style
.width
= this.width_
+ "px"; // for IE
1037 h
.style
.height
= this.height_
+ "px"; // for IE
1042 * Creates an overlay element used to handle mouse events.
1043 * @return {Object} The mouse event element.
1046 Dygraph
.prototype.createMouseEventElement_
= function() {
1047 if (this.isUsingExcanvas_
) {
1048 var elem
= document
.createElement("div");
1049 elem
.style
.position
= 'absolute';
1050 elem
.style
.backgroundColor
= 'white';
1051 elem
.style
.filter
= 'alpha(opacity=0)';
1052 elem
.style
.width
= this.width_
+ "px";
1053 elem
.style
.height
= this.height_
+ "px";
1054 this.graphDiv
.appendChild(elem
);
1057 return this.canvas_
;
1062 * Generate a set of distinct colors for the data series. This is done with a
1063 * color wheel. Saturation/Value are customizable, and the hue is
1064 * equally-spaced around the color wheel. If a custom set of colors is
1065 * specified, that is used instead.
1068 Dygraph
.prototype.setColors_
= function() {
1069 var labels
= this.getLabels();
1070 var num
= labels
.length
- 1;
1072 this.colorsMap_
= {};
1073 var colors
= this.attr_('colors');
1076 var sat
= this.attr_('colorSaturation') || 1.0;
1077 var val
= this.attr_('colorValue') || 0.5;
1078 var half
= Math
.ceil(num
/ 2);
1079 for (i
= 1; i
<= num
; i
++) {
1080 if (!this.visibility()[i
-1]) continue;
1081 // alternate colors for high contrast.
1082 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1083 var hue
= (1.0 * idx
/ (1 + num
));
1084 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1085 this.colors_
.push(colorStr
);
1086 this.colorsMap_
[labels
[i
]] = colorStr
;
1089 for (i
= 0; i
< num
; i
++) {
1090 if (!this.visibility()[i
]) continue;
1091 var colorStr
= colors
[i
% colors
.length
];
1092 this.colors_
.push(colorStr
);
1093 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1099 * Return the list of colors. This is either the list of colors passed in the
1100 * attributes or the autogenerated list of rgb(r,g,b) strings.
1101 * This does not return colors for invisible series.
1102 * @return {Array<string>} The list of colors.
1104 Dygraph
.prototype.getColors
= function() {
1105 return this.colors_
;
1109 * Returns a few attributes of a series, i.e. its color, its visibility, which
1110 * axis it's assigned to, and its column in the original data.
1111 * Returns null if the series does not exist.
1112 * Otherwise, returns an object with column, visibility, color and axis properties.
1113 * The "axis" property will be set to 1 for y1 and 2 for y2.
1114 * The "column" property can be fed back into getValue(row, column) to get
1115 * values for this series.
1117 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1119 var labels
= this.getLabels();
1120 for (var i
= 1; i
< labels
.length
; i
++) {
1121 if (labels
[i
] == series_name
) {
1126 if (idx
== -1) return null;
1131 visible
: this.visibility()[idx
- 1],
1132 color
: this.colorsMap_
[series_name
],
1133 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1138 * Create the text box to adjust the averaging period
1141 Dygraph
.prototype.createRollInterface_
= function() {
1142 // Create a roller if one doesn't exist already.
1143 if (!this.roller_
) {
1144 this.roller_
= document
.createElement("input");
1145 this.roller_
.type
= "text";
1146 this.roller_
.style
.display
= "none";
1147 this.graphDiv
.appendChild(this.roller_
);
1150 var display
= this.attr_('showRoller') ? 'block' : 'none';
1152 var area
= this.plotter_
.area
;
1153 var textAttr
= { "position": "absolute",
1155 "top": (area
.y
+ area
.h
- 25) + "px",
1156 "left": (area
.x
+ 1) + "px",
1159 this.roller_
.size
= "2";
1160 this.roller_
.value
= this.rollPeriod_
;
1161 for (var name
in textAttr
) {
1162 if (textAttr
.hasOwnProperty(name
)) {
1163 this.roller_
.style
[name
] = textAttr
[name
];
1168 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1173 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1174 * canvas (i.e. DOM Coords).
1176 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1177 return Dygraph
.pageX(e
) - context
.px
;
1182 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1183 * canvas (i.e. DOM Coords).
1185 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1186 return Dygraph
.pageY(e
) - context
.py
;
1190 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1194 Dygraph
.prototype.createDragInterface_
= function() {
1196 // Tracks whether the mouse is down right now
1198 isPanning
: false, // is this drag part of a pan?
1199 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1200 dragStartX
: null, // pixel coordinates
1201 dragStartY
: null, // pixel coordinates
1202 dragEndX
: null, // pixel coordinates
1203 dragEndY
: null, // pixel coordinates
1204 dragDirection
: null,
1205 prevEndX
: null, // pixel coordinates
1206 prevEndY
: null, // pixel coordinates
1207 prevDragDirection
: null,
1208 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1210 // The value on the left side of the graph when a pan operation starts.
1211 initialLeftmostDate
: null,
1213 // The number of units each pixel spans. (This won't be valid for log
1215 xUnitsPerPixel
: null,
1217 // TODO(danvk): update this comment
1218 // The range in second/value units that the viewport encompasses during a
1219 // panning operation.
1222 // Top-left corner of the canvas, in DOM coords
1223 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1227 // Values for use with panEdgeFraction, which limit how far outside the
1228 // graph's data boundaries it can be panned.
1229 boundedDates
: null, // [minDate, maxDate]
1230 boundedValues
: null, // [[minValue, maxValue] ...]
1232 // We cover iframes during mouse interactions. See comments in
1233 // dygraph-utils.js for more info on why this is a good idea.
1234 tarp
: new Dygraph
.IFrameTarp(),
1236 // contextB is the same thing as this context object but renamed.
1237 initializeMouseDown
: function(event
, g
, contextB
) {
1238 // prevents mouse drags from selecting page text.
1239 if (event
.preventDefault
) {
1240 event
.preventDefault(); // Firefox, Chrome, etc.
1242 event
.returnValue
= false; // IE
1243 event
.cancelBubble
= true;
1246 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1247 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1248 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1249 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1250 contextB
.cancelNextDblclick
= false;
1251 contextB
.tarp
.cover();
1255 var interactionModel
= this.attr_("interactionModel");
1257 // Self is the graph.
1260 // Function that binds the graph and context to the handler.
1261 var bindHandler
= function(handler
) {
1262 return function(event
) {
1263 handler(event
, self
, context
);
1267 for (var eventName
in interactionModel
) {
1268 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1269 this.addEvent(this.mouseEventElement_
, eventName
,
1270 bindHandler(interactionModel
[eventName
]));
1273 // If the user releases the mouse button during a drag, but not over the
1274 // canvas, then it doesn't count as a zooming action.
1275 this.mouseUpHandler_
= function(event
) {
1276 if (context
.isZooming
|| context
.isPanning
) {
1277 context
.isZooming
= false;
1278 context
.dragStartX
= null;
1279 context
.dragStartY
= null;
1282 if (context
.isPanning
) {
1283 context
.isPanning
= false;
1284 context
.draggingDate
= null;
1285 context
.dateRange
= null;
1286 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1287 delete self
.axes_
[i
].draggingValue
;
1288 delete self
.axes_
[i
].dragValueRange
;
1292 context
.tarp
.uncover();
1295 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1299 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1300 * up any previous zoom rectangles that were drawn. This could be optimized to
1301 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1304 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1305 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1306 * @param {Number} startX The X position where the drag started, in canvas
1308 * @param {Number} endX The current X position of the drag, in canvas coords.
1309 * @param {Number} startY The Y position where the drag started, in canvas
1311 * @param {Number} endY The current Y position of the drag, in canvas coords.
1312 * @param {Number} prevDirection the value of direction on the previous call to
1313 * this function. Used to avoid excess redrawing
1314 * @param {Number} prevEndX The value of endX on the previous call to this
1315 * function. Used to avoid excess redrawing
1316 * @param {Number} prevEndY The value of endY on the previous call to this
1317 * function. Used to avoid excess redrawing
1320 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1321 endY
, prevDirection
, prevEndX
,
1323 var ctx
= this.canvas_ctx_
;
1325 // Clean up from the previous rect if necessary
1326 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1327 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1328 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1329 } else if (prevDirection
== Dygraph
.VERTICAL
){
1330 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1331 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1334 // Draw a light-grey rectangle to show the new viewing area
1335 if (direction
== Dygraph
.HORIZONTAL
) {
1336 if (endX
&& startX
) {
1337 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1338 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1339 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1341 } else if (direction
== Dygraph
.VERTICAL
) {
1342 if (endY
&& startY
) {
1343 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1344 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1345 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1349 if (this.isUsingExcanvas_
) {
1350 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1355 * Clear the zoom rectangle (and perform no zoom).
1358 Dygraph
.prototype.clearZoomRect_
= function() {
1359 this.currentZoomRectArgs_
= null;
1360 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1364 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1365 * the canvas. The exact zoom window may be slightly larger if there are no data
1366 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1367 * which accepts dates that match the raw data. This function redraws the graph.
1369 * @param {Number} lowX The leftmost pixel value that should be visible.
1370 * @param {Number} highX The rightmost pixel value that should be visible.
1373 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1374 this.currentZoomRectArgs_
= null;
1375 // Find the earliest and latest dates contained in this canvasx range.
1376 // Convert the call to date ranges of the raw data.
1377 var minDate
= this.toDataXCoord(lowX
);
1378 var maxDate
= this.toDataXCoord(highX
);
1379 this.doZoomXDates_(minDate
, maxDate
);
1383 * Transition function to use in animations. Returns values between 0.0
1384 * (totally old values) and 1.0 (totally new values) for each frame.
1387 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1389 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1393 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1394 * method with doZoomX which accepts pixel coordinates. This function redraws
1397 * @param {Number} minDate The minimum date that should be visible.
1398 * @param {Number} maxDate The maximum date that should be visible.
1401 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1402 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1403 // can produce strange effects. Rather than the y-axis transitioning slowly
1404 // between values, it can jerk around.)
1405 var old_window
= this.xAxisRange();
1406 var new_window
= [minDate
, maxDate
];
1407 this.zoomed_x_
= true;
1409 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1410 if (that
.attr_("zoomCallback")) {
1411 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1417 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1418 * the canvas. This function redraws the graph.
1420 * @param {Number} lowY The topmost pixel value that should be visible.
1421 * @param {Number} highY The lowest pixel value that should be visible.
1424 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1425 this.currentZoomRectArgs_
= null;
1426 // Find the highest and lowest values in pixel range for each axis.
1427 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1428 // This is because pixels increase as you go down on the screen, whereas data
1429 // coordinates increase as you go up the screen.
1430 var oldValueRanges
= this.yAxisRanges();
1431 var newValueRanges
= [];
1432 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1433 var hi
= this.toDataYCoord(lowY
, i
);
1434 var low
= this.toDataYCoord(highY
, i
);
1435 newValueRanges
.push([low
, hi
]);
1438 this.zoomed_y_
= true;
1440 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1441 if (that
.attr_("zoomCallback")) {
1442 var xRange
= that
.xAxisRange();
1443 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1449 * Reset the zoom to the original view coordinates. This is the same as
1450 * double-clicking on the graph.
1452 Dygraph
.prototype.resetZoom
= function() {
1453 var dirty
= false, dirtyX
= false, dirtyY
= false;
1454 if (this.dateWindow_
!== null) {
1459 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1460 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1466 // Clear any selection, since it's likely to be drawn in the wrong place.
1467 this.clearSelection();
1470 this.zoomed_x_
= false;
1471 this.zoomed_y_
= false;
1473 var minDate
= this.rawData_
[0][0];
1474 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1476 // With only one frame, don't bother calculating extreme ranges.
1477 // TODO(danvk): merge this block w/ the code below
.
1478 if (!this.attr_("animatedZooms")) {
1479 this.dateWindow_
= null;
1480 for (i
= 0; i
< this.axes_
.length
; i
++) {
1481 if (this.axes_
[i
].valueWindow
!== null) {
1482 delete this.axes_
[i
].valueWindow
;
1486 if (this.attr_("zoomCallback")) {
1487 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1492 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1494 oldWindow
= this.xAxisRange();
1495 newWindow
= [minDate
, maxDate
];
1499 oldValueRanges
= this.yAxisRanges();
1500 // TODO(danvk): this is pretty inefficient
1501 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1502 var extremes
= packed
[1];
1504 // this has the side-effect of modifying this.axes_.
1505 // this doesn't make much sense in this context, but it's convenient (we
1506 // need this.axes_[*].extremeValues) and not harmful since we'll be
1507 // calling drawGraph_ shortly, which clobbers these values.
1508 this.computeYAxisRanges_(extremes
);
1510 newValueRanges
= [];
1511 for (i
= 0; i
< this.axes_
.length
; i
++) {
1512 var axis
= this.axes_
[i
];
1513 newValueRanges
.push((axis
.valueRange
!== null &&
1514 axis
.valueRange
!== undefined
) ?
1515 axis
.valueRange
: axis
.extremeRange
);
1520 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1522 that
.dateWindow_
= null;
1523 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1524 if (that
.axes_
[i
].valueWindow
!== null) {
1525 delete that
.axes_
[i
].valueWindow
;
1528 if (that
.attr_("zoomCallback")) {
1529 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1536 * Combined animation logic for all zoom functions.
1537 * either the x parameters or y parameters may be null.
1540 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1541 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1544 var valueRanges
= [];
1547 if (oldXRange
!== null && newXRange
!== null) {
1548 for (step
= 1; step
<= steps
; step
++) {
1549 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1550 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1551 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1555 if (oldYRanges
!== null && newYRanges
!== null) {
1556 for (step
= 1; step
<= steps
; step
++) {
1557 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1559 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1560 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1561 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1563 valueRanges
[step
-1] = thisRange
;
1568 Dygraph
.repeatAndCleanup(function(step
) {
1569 if (valueRanges
.length
) {
1570 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1571 var w
= valueRanges
[step
][i
];
1572 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1575 if (windows
.length
) {
1576 that
.dateWindow_
= windows
[step
];
1579 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1583 * Get the current graph's area object.
1585 * Returns: {x, y, w, h}
1587 Dygraph
.prototype.getArea
= function() {
1588 return this.plotter_
.area
;
1592 * Convert a mouse event to DOM coordinates relative to the graph origin.
1594 * Returns a two-element array: [X, Y].
1596 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1597 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1598 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1599 return [canvasx
, canvasy
];
1603 * Given a canvas X coordinate, find the closest row.
1604 * @param {Number} domX graph-relative DOM X coordinate
1605 * Returns: row number, integer
1608 Dygraph
.prototype.findClosestRow
= function(domX
) {
1609 var minDistX
= Infinity
;
1610 var pointIdx
= -1, setIdx
= -1;
1611 var sets
= this.layout_
.points
;
1612 for (var i
= 0; i
< sets
.length
; i
++) {
1613 var points
= sets
[i
];
1614 var len
= points
.length
;
1615 for (var j
= 0; j
< len
; j
++) {
1616 var point
= points
[j
];
1617 if (!Dygraph
.isValidPoint(point
, true)) continue;
1618 var dist
= Math
.abs(point
.canvasx
- domX
);
1619 if (dist
< minDistX
) {
1627 // TODO(danvk): remove this function; it's trivial and has only one use.
1628 return this.idxToRow_(setIdx
, pointIdx
);
1632 * Given canvas X,Y coordinates, find the closest point.
1634 * This finds the individual data point across all visible series
1635 * that's closest to the supplied DOM coordinates using the standard
1636 * Euclidean X,Y distance.
1638 * @param {Number} domX graph-relative DOM X coordinate
1639 * @param {Number} domY graph-relative DOM Y coordinate
1640 * Returns: {row, seriesName, point}
1643 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1644 var minDist
= Infinity
;
1646 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1647 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1648 var points
= this.layout_
.points
[setIdx
];
1649 for (var i
= 0; i
< points
.length
; ++i
) {
1650 var point
= points
[i
];
1651 if (!Dygraph
.isValidPoint(point
)) continue;
1652 dx
= point
.canvasx
- domX
;
1653 dy
= point
.canvasy
- domY
;
1654 dist
= dx
* dx
+ dy
* dy
;
1655 if (dist
< minDist
) {
1657 closestPoint
= point
;
1658 closestSeries
= setIdx
;
1663 var name
= this.layout_
.setNames
[closestSeries
];
1665 row
: idx
+ this.getLeftBoundary_(),
1672 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1674 * This first finds the X data point closest to the supplied DOM X coordinate,
1675 * then finds the series which puts the Y coordinate on top of its filled area,
1676 * using linear interpolation between adjacent point pairs.
1678 * @param {Number} domX graph-relative DOM X coordinate
1679 * @param {Number} domY graph-relative DOM Y coordinate
1680 * Returns: {row, seriesName, point}
1683 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1684 var row
= this.findClosestRow(domX
);
1685 var boundary
= this.getLeftBoundary_();
1686 var rowIdx
= row
- boundary
;
1687 var sets
= this.layout_
.points
;
1688 var closestPoint
, closestSeries
;
1689 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1690 var points
= this.layout_
.points
[setIdx
];
1691 if (rowIdx
>= points
.length
) continue;
1692 var p1
= points
[rowIdx
];
1693 if (!Dygraph
.isValidPoint(p1
)) continue;
1694 var py
= p1
.canvasy
;
1695 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1696 // interpolate series Y value using next point
1697 var p2
= points
[rowIdx
+ 1];
1698 if (Dygraph
.isValidPoint(p2
)) {
1699 var dx
= p2
.canvasx
- p1
.canvasx
;
1701 var r
= (domX
- p1
.canvasx
) / dx
;
1702 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1705 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1706 // interpolate series Y value using previous point
1707 var p0
= points
[rowIdx
- 1];
1708 if (Dygraph
.isValidPoint(p0
)) {
1709 var dx
= p1
.canvasx
- p0
.canvasx
;
1711 var r
= (p1
.canvasx
- domX
) / dx
;
1712 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1716 // Stop if the point (domX, py) is above this series' upper edge
1717 if (setIdx
=== 0 || py
< domY
) {
1719 closestSeries
= setIdx
;
1722 var name
= this.layout_
.setNames
[closestSeries
];
1731 * When the mouse moves in the canvas, display information about a nearby data
1732 * point and draw dots over those points in the data series. This function
1733 * takes care of cleanup of previously-drawn dots.
1734 * @param {Object} event The mousemove event from the browser.
1737 Dygraph
.prototype.mouseMove_
= function(event
) {
1738 // This prevents JS errors when mousing over the canvas before data loads.
1739 var points
= this.layout_
.points
;
1740 if (points
=== undefined
|| points
=== null) return;
1742 var canvasCoords
= this.eventToDomCoords(event
);
1743 var canvasx
= canvasCoords
[0];
1744 var canvasy
= canvasCoords
[1];
1746 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1747 var selectionChanged
= false;
1748 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1750 if (this.attr_("stackedGraph")) {
1751 closest
= this.findStackedPoint(canvasx
, canvasy
);
1753 closest
= this.findClosestPoint(canvasx
, canvasy
);
1755 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1757 var idx
= this.findClosestRow(canvasx
);
1758 selectionChanged
= this.setSelection(idx
);
1761 var callback
= this.attr_("highlightCallback");
1762 if (callback
&& selectionChanged
) {
1763 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1768 * Fetch left offset from first defined boundaryIds record (see bug #236).
1771 Dygraph
.prototype.getLeftBoundary_
= function() {
1772 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1773 if (this.boundaryIds_
[i
] !== undefined
) {
1774 return this.boundaryIds_
[i
][0];
1781 * Transforms layout_.points index into data row number.
1782 * @param int layout_.points index
1783 * @return int row number, or -1 if none could be found.
1786 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1787 if (rowIdx
< 0) return -1;
1789 var boundary
= this.getLeftBoundary_();
1790 return boundary
+ rowIdx
;
1791 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1792 // var set = this.layout_.datasets[setIdx];
1793 // if (idx < set.length) {
1794 // return boundary + idx;
1796 // idx -= set.length;
1801 Dygraph
.prototype.animateSelection_
= function(direction
) {
1802 var totalSteps
= 10;
1804 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1805 if (this.animateId
=== undefined
) this.animateId
= 0;
1806 var start
= this.fadeLevel
;
1807 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1809 if (this.fadeLevel
) {
1810 this.updateSelection_(1.0);
1815 var thisId
= ++this.animateId
;
1817 Dygraph
.repeatAndCleanup(
1819 // ignore simultaneous animations
1820 if (that
.animateId
!= thisId
) return;
1822 that
.fadeLevel
+= direction
;
1823 if (that
.fadeLevel
=== 0) {
1824 that
.clearSelection();
1826 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1829 steps
, millis
, function() {});
1833 * Draw dots over the selectied points in the data series. This function
1834 * takes care of cleanup of previously-drawn dots.
1837 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1838 var defaultPrevented
= this.cascadeEvents_('select', {
1839 selectedX
: this.lastx_
,
1840 selectedPoints
: this.selPoints_
1842 // TODO(danvk): use defaultPrevented here?
1844 // Clear the previously drawn vertical, if there is one
1846 var ctx
= this.canvas_ctx_
;
1847 if (this.attr_('highlightSeriesOpts')) {
1848 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1849 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1851 // Activating background fade includes an animation effect for a gradual
1852 // fade. TODO(klausw): make this independently configurable if it causes
1853 // issues? Use a shared preference to control animations?
1854 var animateBackgroundFade
= true;
1855 if (animateBackgroundFade
) {
1856 if (opt_animFraction
=== undefined
) {
1857 // start a new animation
1858 this.animateSelection_(1);
1861 alpha
*= opt_animFraction
;
1863 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1864 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1867 // Redraw only the highlighted series in the interactive canvas (not the
1868 // static plot canvas, which is where series are usually drawn).
1869 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1870 } else if (this.previousVerticalX_
>= 0) {
1871 // Determine the maximum highlight circle size.
1872 var maxCircleSize
= 0;
1873 var labels
= this.attr_('labels');
1874 for (i
= 1; i
< labels
.length
; i
++) {
1875 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1876 if (r
> maxCircleSize
) maxCircleSize
= r
;
1878 var px
= this.previousVerticalX_
;
1879 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1880 2 * maxCircleSize
+ 2, this.height_
);
1883 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1884 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1887 if (this.selPoints_
.length
> 0) {
1888 // Draw colored circles over the center of each selected point
1889 var canvasx
= this.selPoints_
[0].canvasx
;
1891 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1892 var pt
= this.selPoints_
[i
];
1893 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1895 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1896 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1897 var color
= this.plotter_
.colors
[pt
.name
];
1899 callback
= Dygraph
.Circles
.DEFAULT
;
1901 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1902 ctx
.strokeStyle
= color
;
1903 ctx
.fillStyle
= color
;
1904 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1909 this.previousVerticalX_
= canvasx
;
1914 * Manually set the selected points and display information about them in the
1915 * legend. The selection can be cleared using clearSelection() and queried
1916 * using getSelection().
1917 * @param { Integer } row number that should be highlighted (i.e. appear with
1918 * hover dots on the chart). Set to false to clear any selection.
1919 * @param { seriesName } optional series name to highlight that series with the
1920 * the highlightSeriesOpts setting.
1921 * @param { locked } optional If true, keep seriesName selected when mousing
1922 * over the graph, disabling closest-series highlighting. Call clearSelection()
1925 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1926 // Extract the points we've selected
1927 this.selPoints_
= [];
1929 if (row
!== false) {
1930 row
-= this.getLeftBoundary_();
1933 var changed
= false;
1934 if (row
!== false && row
>= 0) {
1935 if (row
!= this.lastRow_
) changed
= true;
1936 this.lastRow_
= row
;
1937 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1938 var set
= this.layout_
.datasets
[setIdx
];
1939 if (row
< set
.length
) {
1940 var point
= this.layout_
.points
[setIdx
][row
];
1942 if (this.attr_("stackedGraph")) {
1943 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1946 if (point
.yval
!== null) this.selPoints_
.push(point
);
1950 if (this.lastRow_
>= 0) changed
= true;
1954 if (this.selPoints_
.length
) {
1955 this.lastx_
= this.selPoints_
[0].xval
;
1960 if (opt_seriesName
!== undefined
) {
1961 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1962 this.highlightSet_
= opt_seriesName
;
1965 if (opt_locked
!== undefined
) {
1966 this.lockedSet_
= opt_locked
;
1970 this.updateSelection_(undefined
);
1976 * The mouse has left the canvas. Clear out whatever artifacts remain
1977 * @param {Object} event the mouseout event from the browser.
1980 Dygraph
.prototype.mouseOut_
= function(event
) {
1981 if (this.attr_("unhighlightCallback")) {
1982 this.attr_("unhighlightCallback")(event
);
1985 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
1986 this.clearSelection();
1991 * Clears the current selection (i.e. points that were highlighted by moving
1992 * the mouse over the chart).
1994 Dygraph
.prototype.clearSelection
= function() {
1995 this.cascadeEvents_('deselect', {});
1997 this.lockedSet_
= false;
1998 // Get rid of the overlay data
1999 if (this.fadeLevel
) {
2000 this.animateSelection_(-1);
2003 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2005 this.selPoints_
= [];
2008 this.highlightSet_
= null;
2012 * Returns the number of the currently selected row. To get data for this row,
2013 * you can use the getValue method.
2014 * @return { Integer } row number, or -1 if nothing is selected
2016 Dygraph
.prototype.getSelection
= function() {
2017 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2021 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2022 var points
= this.layout_
.points
[setIdx
];
2023 for (var row
= 0; row
< points
.length
; row
++) {
2024 if (points
[row
].x
== this.selPoints_
[0].x
) {
2025 return row
+ this.getLeftBoundary_();
2033 * Returns the name of the currently-highlighted series.
2034 * Only available when the highlightSeriesOpts option is in use.
2036 Dygraph
.prototype.getHighlightSeries
= function() {
2037 return this.highlightSet_
;
2041 * Returns true if the currently-highlighted series was locked
2042 * via setSelection(..., seriesName, true).
2044 Dygraph
.prototype.isSeriesLocked
= function() {
2045 return this.lockedSet_
;
2049 * Fires when there's data available to be graphed.
2050 * @param {String} data Raw CSV data to be plotted
2053 Dygraph
.prototype.loadedEvent_
= function(data
) {
2054 this.rawData_
= this.parseCSV_(data
);
2059 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2062 Dygraph
.prototype.addXTicks_
= function() {
2063 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2065 if (this.dateWindow_
) {
2066 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2068 range
= this.fullXRange_();
2071 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2072 var xTicks
= xAxisOptionsView('ticker')(
2075 this.width_
, // TODO(danvk): should be area.width
2078 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2079 // console.log(msg);
2080 this.layout_
.setXTicks(xTicks
);
2085 * Computes the range of the data series (including confidence intervals).
2086 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2087 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2088 * @return [low, high]
2090 Dygraph
.prototype.extremeValues_
= function(series
) {
2091 var minY
= null, maxY
= null, j
, y
;
2093 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2095 // With custom bars, maxY is the max of the high values.
2096 for (j
= 0; j
< series
.length
; j
++) {
2097 y
= series
[j
][1][0];
2098 if (y
=== null || isNaN(y
)) continue;
2099 var low
= y
- series
[j
][1][1];
2100 var high
= y
+ series
[j
][1][2];
2101 if (low
> y
) low
= y
; // this can happen with custom bars,
2102 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2103 if (maxY
=== null || high
> maxY
) {
2106 if (minY
=== null || low
< minY
) {
2111 for (j
= 0; j
< series
.length
; j
++) {
2113 if (y
=== null || isNaN(y
)) continue;
2114 if (maxY
=== null || y
> maxY
) {
2117 if (minY
=== null || y
< minY
) {
2123 return [minY
, maxY
];
2128 * This function is called once when the chart's data is changed or the options
2129 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2130 * idea is that values derived from the chart's data can be computed here,
2131 * rather than every time the chart is drawn. This includes things like the
2132 * number of axes, rolling averages, etc.
2134 Dygraph
.prototype.predraw_
= function() {
2135 var start
= new Date();
2137 this.layout_
.computePlotArea();
2139 // TODO(danvk): move more computations out of drawGraph_ and into here.
2140 this.computeYAxes_();
2142 // Create a new plotter.
2143 if (this.plotter_
) {
2144 this.cascadeEvents_('clearChart');
2145 this.plotter_
.clear();
2147 this.plotter_
= new DygraphCanvasRenderer(this,
2152 // The roller sits in the bottom left corner of the chart. We don't know where
2153 // this will be until the options are available, so it's positioned here.
2154 this.createRollInterface_();
2156 this.cascadeEvents_('predraw');
2158 // Convert the raw data (a 2D array) into the internal format and compute
2159 // rolling averages.
2160 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2161 for (var i
= 1; i
< this.numColumns(); i
++) {
2162 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2163 var logScale
= this.attr_('logscale');
2164 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2165 series
= this.rollingAverage(series
, this.rollPeriod_
);
2166 this.rolledSeries_
.push(series
);
2169 // If the data or options have changed, then we'd better redraw.
2172 // This is used to determine whether to do various animations.
2173 var end
= new Date();
2174 this.drawingTimeMs_
= (end
- start
);
2178 * Loop over all fields and create datasets, calculating extreme y-values for
2179 * each series and extreme x-indices as we go.
2181 * dateWindow is passed in as an explicit parameter so that we can compute
2182 * extreme values "speculatively", i.e. without actually setting state on the
2185 * TODO(danvk): make this more of a true function
2186 * @return [ datasets, seriesExtremes, boundaryIds ]
2189 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2190 var boundaryIds
= [];
2191 var cumulative_y
= []; // For stacked series.
2193 var extremes
= {}; // series name -> [low, high]
2196 // Loop over the fields (series). Go from the last to the first,
2197 // because if they're stacked that's how we accumulate the values.
2198 var num_series
= rolledSeries
.length
- 1;
2199 for (i
= num_series
; i
>= 1; i
--) {
2200 if (!this.visibility()[i
- 1]) continue;
2202 // Note: this copy _is_ necessary at the moment.
2203 // If you remove it, it breaks zooming with error bars on.
2204 // TODO(danvk): investigate further & write a test for this.
2206 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2207 series
.push(rolledSeries
[i
][j
]);
2210 // Prune down to the desired range, if necessary (for zooming)
2211 // Because there can be lines going to points outside of the visible area,
2212 // we actually prune to visible points, plus one on either side.
2213 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2215 var low
= dateWindow
[0];
2216 var high
= dateWindow
[1];
2218 // TODO(danvk): do binary search instead of linear search.
2219 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2220 var firstIdx
= null, lastIdx
= null;
2221 for (k
= 0; k
< series
.length
; k
++) {
2222 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2225 if (series
[k
][0] <= high
) {
2229 if (firstIdx
=== null) firstIdx
= 0;
2230 if (firstIdx
> 0) firstIdx
--;
2231 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2232 if (lastIdx
< series
.length
- 1) lastIdx
++;
2233 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2234 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2235 pruned
.push(series
[k
]);
2239 boundaryIds
[i
-1] = [0, series
.length
-1];
2242 var seriesExtremes
= this.extremeValues_(series
);
2245 for (j
=0; j
<series
.length
; j
++) {
2246 series
[j
] = [series
[j
][0],
2251 } else if (this.attr_("stackedGraph")) {
2252 var l
= series
.length
;
2254 for (j
= 0; j
< l
; j
++) {
2255 // If one data set has a NaN, let all subsequent stacked
2256 // sets inherit the NaN -- only start at 0 for the first set.
2257 var x
= series
[j
][0];
2258 if (cumulative_y
[x
] === undefined
) {
2259 cumulative_y
[x
] = 0;
2262 actual_y
= series
[j
][1];
2263 if (actual_y
=== null) {
2264 series
[j
] = [x
, null];
2268 cumulative_y
[x
] += actual_y
;
2270 series
[j
] = [x
, cumulative_y
[x
]];
2272 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2273 seriesExtremes
[1] = cumulative_y
[x
];
2275 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2276 seriesExtremes
[0] = cumulative_y
[x
];
2281 var seriesName
= this.attr_("labels")[i
];
2282 extremes
[seriesName
] = seriesExtremes
;
2283 datasets
[i
] = series
;
2286 // For stacked graphs, a NaN value for any point in the sum should create a
2287 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2288 if (this.attr_("stackedGraph")) {
2289 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2290 // Use the first nonempty dataset to get X values.
2291 if (!datasets
[k
]) continue;
2292 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2293 var x
= datasets
[k
][j
][0];
2294 if (isNaN(cumulative_y
[x
])) {
2295 // Set all Y values to NaN at that X value.
2296 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2297 if (!datasets
[i
]) continue;
2298 datasets
[i
][j
][1] = NaN
;
2306 return [ datasets
, extremes
, boundaryIds
];
2310 * Update the graph with new data. This method is called when the viewing area
2311 * has changed. If the underlying data or options have changed, predraw_ will
2312 * be called before drawGraph_ is called.
2316 Dygraph
.prototype.drawGraph_
= function() {
2317 var start
= new Date();
2319 // This is used to set the second parameter to drawCallback, below.
2320 var is_initial_draw
= this.is_initial_draw_
;
2321 this.is_initial_draw_
= false;
2323 this.layout_
.removeAllDatasets();
2325 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2327 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2328 var datasets
= packed
[0];
2329 var extremes
= packed
[1];
2330 this.boundaryIds_
= packed
[2];
2332 this.setIndexByName_
= {};
2333 var labels
= this.attr_("labels");
2334 if (labels
.length
> 0) {
2335 this.setIndexByName_
[labels
[0]] = 0;
2338 for (var i
= 1; i
< datasets
.length
; i
++) {
2339 this.setIndexByName_
[labels
[i
]] = i
;
2340 if (!this.visibility()[i
- 1]) continue;
2341 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2342 this.datasetIndex_
[i
] = dataIdx
++;
2345 this.computeYAxisRanges_(extremes
);
2346 this.layout_
.setYAxes(this.axes_
);
2350 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2351 var tmp_zoomed_x
= this.zoomed_x_
;
2352 // Tell PlotKit to use this new data and render itself
2353 this.layout_
.setDateWindow(this.dateWindow_
);
2354 this.zoomed_x_
= tmp_zoomed_x
;
2355 this.layout_
.evaluateWithError();
2356 this.renderGraph_(is_initial_draw
);
2358 if (this.attr_("timingName")) {
2359 var end
= new Date();
2361 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2367 * This does the work of drawing the chart. It assumes that the layout and axis
2368 * scales have already been set (e.g. by predraw_).
2372 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2373 this.cascadeEvents_('clearChart');
2374 this.plotter_
.clear();
2376 if (this.attr_('underlayCallback')) {
2377 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2378 // users who expect a deprecated form of this callback.
2379 this.attr_('underlayCallback')(
2380 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2384 canvas
: this.hidden_
,
2385 drawingContext
: this.hidden_ctx_
2387 this.cascadeEvents_('willDrawChart', e
);
2388 this.plotter_
.render();
2389 this.cascadeEvents_('didDrawChart', e
);
2391 // TODO(danvk): is this a performance bottleneck when panning?
2392 // The interaction canvas should already be empty in that situation.
2393 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2394 this.canvas_
.height
);
2396 if (this.attr_("drawCallback") !== null) {
2397 this.attr_("drawCallback")(this, is_initial_draw
);
2403 * Determine properties of the y-axes which are independent of the data
2404 * currently being displayed. This includes things like the number of axes and
2405 * the style of the axes. It does not include the range of each axis and its
2407 * This fills in this.axes_.
2408 * axes_ = [ { options } ]
2409 * indices are into the axes_ array.
2411 Dygraph
.prototype.computeYAxes_
= function() {
2413 // Preserve valueWindow settings if they exist, and if the user hasn't
2414 // specified a new valueRange.
2415 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2416 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2418 for (index
= 0; index
< this.axes_
.length
; index
++) {
2419 valueWindows
.push(this.axes_
[index
].valueWindow
);
2423 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2424 // data computation as well as options storage.
2425 // Go through once and add all the axes.
2428 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2429 // Add a new axis, making a copy of its per-axis options.
2430 opts
= { g
: this };
2431 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2432 this.axes_
[axis
] = opts
;
2436 // Copy global valueRange option over to the first axis.
2437 // NOTE(konigsberg): Are these two statements necessary?
2438 // I tried removing it. The automated tests pass, and manually
2439 // messing with tests/zoom
.html showed no trouble
.
2440 v
= this.attr_('valueRange');
2441 if (v
) this.axes_
[0].valueRange
= v
;
2443 if (valueWindows
!== undefined
) {
2444 // Restore valueWindow settings.
2445 for (index
= 0; index
< valueWindows
.length
; index
++) {
2446 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2450 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2452 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2453 v
= opts("valueRange");
2454 if (v
) this.axes_
[axis
].valueRange
= v
;
2455 } else { // To keep old behavior
2456 var axes
= this.user_attrs_
.axes
;
2457 if (axes
&& axes
.y2
) {
2458 v
= axes
.y2
.valueRange
;
2459 if (v
) this.axes_
[axis
].valueRange
= v
;
2466 * Returns the number of y-axes on the chart.
2467 * @return {Number} the number of axes.
2469 Dygraph
.prototype.numAxes
= function() {
2470 return this.attributes_
.numAxes();
2475 * Returns axis properties for the given series.
2476 * @param { String } setName The name of the series for which to get axis
2477 * properties, e.g. 'Y1'.
2478 * @return { Object } The axis properties.
2480 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2481 // TODO(danvk): handle errors.
2482 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2487 * Determine the value range and tick marks for each axis.
2488 * @param {Object} extremes A mapping from seriesName -> [low, high]
2489 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2491 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2493 var numAxes
= this.attributes_
.numAxes();
2495 // Compute extreme values, a span and tick marks for each axis.
2496 for (var i
= 0; i
< numAxes
; i
++) {
2497 var axis
= this.axes_
[i
];
2498 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2499 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2500 series
= this.attributes_
.seriesForAxis(i
);
2502 if (series
.length
== 0) {
2503 // If no series are defined or visible then use a reasonable default
2504 axis
.extremeRange
= [0, 1];
2506 // Calculate the extremes of extremes.
2507 var minY
= Infinity
; // extremes[series[0]][0];
2508 var maxY
= -Infinity
; // extremes[series[0]][1];
2509 var extremeMinY
, extremeMaxY
;
2511 for (var j
= 0; j
< series
.length
; j
++) {
2512 // this skips invisible series
2513 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2515 // Only use valid extremes to stop null data series' from corrupting the scale.
2516 extremeMinY
= extremes
[series
[j
]][0];
2517 if (extremeMinY
!== null) {
2518 minY
= Math
.min(extremeMinY
, minY
);
2520 extremeMaxY
= extremes
[series
[j
]][1];
2521 if (extremeMaxY
!== null) {
2522 maxY
= Math
.max(extremeMaxY
, maxY
);
2525 if (includeZero
&& minY
> 0) minY
= 0;
2527 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2528 if (minY
== Infinity
) minY
= 0;
2529 if (maxY
== -Infinity
) maxY
= 1;
2531 // Add some padding and round up to an integer to be human-friendly.
2532 var span
= maxY
- minY
;
2533 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2534 if (span
=== 0) { span
= maxY
; }
2536 var maxAxisY
, minAxisY
;
2538 maxAxisY
= maxY
+ 0.1 * span
;
2541 maxAxisY
= maxY
+ 0.1 * span
;
2542 minAxisY
= minY
- 0.1 * span
;
2544 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2545 if (!this.attr_("avoidMinZero")) {
2546 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2547 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2550 if (this.attr_("includeZero")) {
2551 if (maxY
< 0) maxAxisY
= 0;
2552 if (minY
> 0) minAxisY
= 0;
2555 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2557 if (axis
.valueWindow
) {
2558 // This is only set if the user has zoomed on the y-axis. It is never set
2559 // by a user. It takes precedence over axis.valueRange because, if you set
2560 // valueRange, you'd still expect to be able to pan.
2561 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2562 } else if (axis
.valueRange
) {
2563 // This is a user-set value range for this axis.
2564 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2566 axis
.computedValueRange
= axis
.extremeRange
;
2569 // Add ticks. By default, all axes inherit the tick positions of the
2570 // primary axis. However, if an axis is specifically marked as having
2571 // independent ticks, then that is permissible as well.
2572 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2573 var ticker
= opts('ticker');
2574 if (i
=== 0 || axis
.independentTicks
) {
2575 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2576 axis
.computedValueRange
[1],
2577 this.height_
, // TODO(danvk): should be area.height
2581 var p_axis
= this.axes_
[0];
2582 var p_ticks
= p_axis
.ticks
;
2583 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2584 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2585 var tick_values
= [];
2586 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2587 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2588 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2589 tick_values
.push(y_val
);
2592 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2593 axis
.computedValueRange
[1],
2594 this.height_
, // TODO(danvk): should be area.height
2603 * Extracts one series from the raw data (a 2D array) into an array of (date,
2606 * This is where undesirable points (i.e. negative values on log scales and
2607 * missing values through which we wish to connect lines) are dropped.
2608 * TODO(danvk): the "missing values" bit above doesn't seem right.
2612 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2613 // TODO(danvk): pre-allocate series here.
2615 for (var j
= 0; j
< rawData
.length
; j
++) {
2616 var x
= rawData
[j
][0];
2617 var point
= rawData
[j
][i
];
2619 // On the log scale, points less than zero do not exist.
2620 // This will create a gap in the chart.
2625 series
.push([x
, point
]);
2632 * Calculates the rolling average of a data set.
2633 * If originalData is [label, val], rolls the average of those.
2634 * If originalData is [label, [, it's interpreted as [value, stddev]
2635 * and the roll is returned in the same form, with appropriately reduced
2636 * stddev for each value.
2637 * Note that this is where fractional input (i.e. '5/10') is converted into
2639 * @param {Array} originalData The data in the appropriate format (see above)
2640 * @param {Number} rollPeriod The number of points over which to average the
2643 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2644 if (originalData
.length
< 2)
2645 return originalData
;
2646 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2647 var rollingData
= [];
2648 var sigma
= this.attr_("sigma");
2650 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2651 if (this.fractions_
) {
2653 var den
= 0; // numerator/denominator
2655 for (i
= 0; i
< originalData
.length
; i
++) {
2656 num
+= originalData
[i
][1][0];
2657 den
+= originalData
[i
][1][1];
2658 if (i
- rollPeriod
>= 0) {
2659 num
-= originalData
[i
- rollPeriod
][1][0];
2660 den
-= originalData
[i
- rollPeriod
][1][1];
2663 var date
= originalData
[i
][0];
2664 var value
= den
? num
/ den
: 0.0;
2665 if (this.attr_("errorBars")) {
2666 if (this.attr_("wilsonInterval")) {
2667 // For more details on this confidence interval, see:
2668 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2670 var p
= value
< 0 ? 0 : value
, n
= den
;
2671 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2672 var denom
= 1 + sigma
* sigma
/ den
;
2673 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2674 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2675 rollingData
[i
] = [date
,
2676 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2678 rollingData
[i
] = [date
, [0, 0, 0]];
2681 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2682 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2685 rollingData
[i
] = [date
, mult
* value
];
2688 } else if (this.attr_("customBars")) {
2693 for (i
= 0; i
< originalData
.length
; i
++) {
2694 var data
= originalData
[i
][1];
2696 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2698 if (y
!== null && !isNaN(y
)) {
2704 if (i
- rollPeriod
>= 0) {
2705 var prev
= originalData
[i
- rollPeriod
];
2706 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2714 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2715 1.0 * (mid
- low
) / count
,
2716 1.0 * (high
- mid
) / count
]];
2718 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2722 // Calculate the rolling average for the first rollPeriod - 1 points where
2723 // there is not enough data to roll over the full number of points
2724 if (!this.attr_("errorBars")){
2725 if (rollPeriod
== 1) {
2726 return originalData
;
2729 for (i
= 0; i
< originalData
.length
; i
++) {
2732 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2733 y
= originalData
[j
][1];
2734 if (y
=== null || isNaN(y
)) continue;
2736 sum
+= originalData
[j
][1];
2739 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2741 rollingData
[i
] = [originalData
[i
][0], null];
2746 for (i
= 0; i
< originalData
.length
; i
++) {
2750 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2751 y
= originalData
[j
][1][0];
2752 if (y
=== null || isNaN(y
)) continue;
2754 sum
+= originalData
[j
][1][0];
2755 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2758 stddev
= Math
.sqrt(variance
) / num_ok
;
2759 rollingData
[i
] = [originalData
[i
][0],
2760 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2762 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2772 * Detects the type of the str (date or numeric) and sets the various
2773 * formatting attributes in this.attrs_ based on this type.
2774 * @param {String} str An x value.
2777 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2779 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2780 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2781 str
.indexOf('/') >= 0 ||
2782 isNaN(parseFloat(str
))) {
2784 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2785 // TODO(danvk): remove support for this format.
2789 this.setXAxisOptions_(isDate
);
2792 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2794 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2795 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2796 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2797 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2799 /** @private (shut up, jsdoc!) */
2800 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2801 // TODO(danvk): use Dygraph.numberValueFormatter here?
2802 /** @private (shut up, jsdoc!) */
2803 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2804 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2805 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2810 * Parses the value as a floating point number. This is like the parseFloat()
2811 * built-in, but with a few differences:
2812 * - the empty string is parsed as null, rather than NaN.
2813 * - if the string cannot be parsed at all, an error is logged.
2814 * If the string can't be parsed, this method returns null.
2815 * @param {String} x The string to be parsed
2816 * @param {Number} opt_line_no The line number from which the string comes.
2817 * @param {String} opt_line The text of the line from which the string comes.
2821 // Parse the x as a float or return null if it's not a number.
2822 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2823 var val
= parseFloat(x
);
2824 if (!isNaN(val
)) return val
;
2826 // Try to figure out what happeend.
2827 // If the value is the empty string, parse it as null.
2828 if (/^ *$/.test(x
)) return null;
2830 // If it was actually "NaN", return it as NaN.
2831 if (/^ *nan *$/i.test(x
)) return NaN
;
2833 // Looks like a parsing error.
2834 var msg
= "Unable to parse '" + x
+ "' as a number";
2835 if (opt_line
!== null && opt_line_no
!== null) {
2836 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2845 * Parses a string in a special csv format. We expect a csv file where each
2846 * line is a date point, and the first field in each line is the date string.
2847 * We also expect that all remaining fields represent series.
2848 * if the errorBars attribute is set, then interpret the fields as:
2849 * date, series1, stddev1, series2, stddev2, ...
2850 * @param {[Object]} data See above.
2852 * @return [Object] An array with one entry for each row. These entries
2853 * are an array of cells in that row. The first entry is the parsed x-value for
2854 * the row. The second, third, etc. are the y-values. These can take on one of
2855 * three forms, depending on the CSV and constructor parameters:
2857 * 2. [ value, stddev ]
2858 * 3. [ low value, center value, high value ]
2860 Dygraph
.prototype.parseCSV_
= function(data
) {
2862 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2863 var lines
= data
.split(line_delimiter
|| "\n");
2866 // Use the default delimiter or fall back to a tab if that makes sense.
2867 var delim
= this.attr_('delimiter');
2868 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2873 if (!('labels' in this.user_attrs_
)) {
2874 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2876 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2877 this.attributes_
.reparseSeries();
2882 var defaultParserSet
= false; // attempt to auto-detect x value type
2883 var expectedCols
= this.attr_("labels").length
;
2884 var outOfOrder
= false;
2885 for (var i
= start
; i
< lines
.length
; i
++) {
2886 var line
= lines
[i
];
2888 if (line
.length
=== 0) continue; // skip blank lines
2889 if (line
[0] == '#') continue; // skip comment lines
2890 var inFields
= line
.split(delim
);
2891 if (inFields
.length
< 2) continue;
2894 if (!defaultParserSet
) {
2895 this.detectTypeFromString_(inFields
[0]);
2896 xParser
= this.attr_("xValueParser");
2897 defaultParserSet
= true;
2899 fields
[0] = xParser(inFields
[0], this);
2901 // If fractions are expected, parse the numbers as "A/B
"
2902 if (this.fractions_) {
2903 for (j = 1; j < inFields.length; j++) {
2904 // TODO(danvk): figure out an appropriate way to flag parse errors.
2905 vals = inFields[j].split("/");
2906 if (vals.length != 2) {
2907 this.error('Expected fractional "num
/den
" values in CSV data ' +
2908 "but found a value
'" + inFields[j] + "' on line
" +
2909 (1 + i) + " ('" + line + "') which is not of
this form
.");
2912 fields[j] = [this.parseFloat_(vals[0], i, line),
2913 this.parseFloat_(vals[1], i, line)];
2916 } else if (this.attr_("errorBars
")) {
2917 // If there are error bars, values are (value, stddev) pairs
2918 if (inFields.length % 2 != 1) {
2919 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2920 'but line ' + (1 + i) + ' has an odd number of values (' +
2921 (inFields.length - 1) + "): '" + line + "'");
2923 for (j = 1; j < inFields.length; j += 2) {
2924 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2925 this.parseFloat_(inFields[j + 1], i, line)];
2927 } else if (this.attr_("customBars
")) {
2928 // Bars are a low;center;high tuple
2929 for (j = 1; j < inFields.length; j++) {
2930 var val = inFields[j];
2931 if (/^ *$/.test(val)) {
2932 fields[j] = [null, null, null];
2934 vals = val.split(";");
2935 if (vals.length == 3) {
2936 fields[j] = [ this.parseFloat_(vals[0], i, line),
2937 this.parseFloat_(vals[1], i, line),
2938 this.parseFloat_(vals[2], i, line) ];
2940 this.warn('When using customBars, values must be either blank ' +
2941 'or "low
;center
;high
" tuples (got "' + val +
2942 '" on line ' + (1+i));
2947 // Values are just numbers
2948 for (j = 1; j < inFields.length; j++) {
2949 fields[j] = this.parseFloat_(inFields[j], i, line);
2952 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2956 if (fields.length != expectedCols) {
2957 this.error("Number of columns
in line
" + i + " (" + fields.length +
2958 ") does not agree
with number of
labels (" + expectedCols +
2962 // If the user specified the 'labels' option and none of the cells of the
2963 // first row parsed correctly, then they probably double-specified the
2964 // labels. We go with the values set in the option, discard this row and
2965 // log a warning to the JS console.
2966 if (i === 0 && this.attr_('labels')) {
2967 var all_null = true;
2968 for (j = 0; all_null && j < fields.length; j++) {
2969 if (fields[j]) all_null = false;
2972 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2973 "CSV
data ('" + line + "') appears to also contain labels
. " +
2974 "Will drop the CSV labels and
use the option labels
.");
2982 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2983 ret.sort(function(a,b) { return a[0] - b[0]; });
2991 * The user has provided their data as a pre-packaged JS array. If the x values
2992 * are numeric, this is the same as dygraphs' internal format. If the x values
2993 * are dates, we need to convert them from Date objects to ms since epoch.
2994 * @param {[Object]} data
2995 * @return {[Object]} data with numeric x values.
2997 Dygraph.prototype.parseArray_ = function(data) {
2998 // Peek at the first x value to see if it's numeric.
2999 if (data.length === 0) {
3000 this.error("Can
't plot empty data set");
3003 if (data[0].length === 0) {
3004 this.error("Data set cannot contain an empty row");
3009 if (this.attr_("labels") === null) {
3010 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3011 "in the options parameter");
3012 this.attrs_.labels = [ "X" ];
3013 for (i = 1; i < data[0].length; i++) {
3014 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3016 this.attributes_.reparseSeries();
3018 var num_labels = this.attr_("labels");
3019 if (num_labels.length != data[0].length) {
3020 this.error("Mismatch between number of labels (" + num_labels +
3021 ") and number of columns in array (" + data[0].length + ")");
3026 if (Dygraph.isDateLike(data[0][0])) {
3027 // Some intelligent defaults for a date x-axis.
3028 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3029 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3030 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3032 // Assume they're all dates
.
3033 var parsedData
= Dygraph
.clone(data
);
3034 for (i
= 0; i
< data
.length
; i
++) {
3035 if (parsedData
[i
].length
=== 0) {
3036 this.error("Row " + (1 + i
) + " of data is empty");
3039 if (parsedData
[i
][0] === null ||
3040 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3041 isNaN(parsedData
[i
][0].getTime())) {
3042 this.error("x value in row " + (1 + i
) + " is not a Date");
3045 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3049 // Some intelligent defaults for a numeric x-axis.
3050 /** @private (shut up, jsdoc!) */
3051 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3052 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3053 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3059 * Parses a DataTable object from gviz.
3060 * The data is expected to have a first column that is either a date or a
3061 * number. All subsequent columns must be numbers. If there is a clear mismatch
3062 * between this.xValueParser_ and the type of the first column, it will be
3063 * fixed. Fills out rawData_.
3064 * @param {[Object]} data See above.
3067 Dygraph
.prototype.parseDataTable_
= function(data
) {
3068 var shortTextForAnnotationNum
= function(num
) {
3069 // converts [0-9]+ [A-Z][a-z]*
3070 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3071 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3072 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3073 num
= Math
.floor(num
/ 26);
3075 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3076 num
= Math
.floor((num
- 1) / 26);
3081 var cols
= data
.getNumberOfColumns();
3082 var rows
= data
.getNumberOfRows();
3084 var indepType
= data
.getColumnType(0);
3085 if (indepType
== 'date' || indepType
== 'datetime') {
3086 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3087 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3088 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3089 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3090 } else if (indepType
== 'number') {
3091 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3092 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3093 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3094 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3096 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3097 "column 1 of DataTable input (Got '" + indepType
+ "')");
3101 // Array of the column indices which contain data (and not annotations).
3103 var annotationCols
= {}; // data index -> [annotation cols]
3104 var hasAnnotations
= false;
3106 for (i
= 1; i
< cols
; i
++) {
3107 var type
= data
.getColumnType(i
);
3108 if (type
== 'number') {
3110 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3111 // This is OK -- it's an annotation column.
3112 var dataIdx
= colIdx
[colIdx
.length
- 1];
3113 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3114 annotationCols
[dataIdx
] = [i
];
3116 annotationCols
[dataIdx
].push(i
);
3118 hasAnnotations
= true;
3120 this.error("Only 'number' is supported as a dependent type with Gviz." +
3121 " 'string' is only supported if displayAnnotations is true");
3125 // Read column labels
3126 // TODO(danvk): add support back for errorBars
3127 var labels
= [data
.getColumnLabel(0)];
3128 for (i
= 0; i
< colIdx
.length
; i
++) {
3129 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3130 if (this.attr_("errorBars")) i
+= 1;
3132 this.attrs_
.labels
= labels
;
3133 cols
= labels
.length
;
3136 var outOfOrder
= false;
3137 var annotations
= [];
3138 for (i
= 0; i
< rows
; i
++) {
3140 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3141 data
.getValue(i
, 0) === null) {
3142 this.warn("Ignoring row " + i
+
3143 " of DataTable because of undefined or null first column.");
3147 if (indepType
== 'date' || indepType
== 'datetime') {
3148 row
.push(data
.getValue(i
, 0).getTime());
3150 row
.push(data
.getValue(i
, 0));
3152 if (!this.attr_("errorBars")) {
3153 for (j
= 0; j
< colIdx
.length
; j
++) {
3154 var col
= colIdx
[j
];
3155 row
.push(data
.getValue(i
, col
));
3156 if (hasAnnotations
&&
3157 annotationCols
.hasOwnProperty(col
) &&
3158 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3160 ann
.series
= data
.getColumnLabel(col
);
3162 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3164 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3165 if (k
) ann
.text
+= "\n";
3166 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3168 annotations
.push(ann
);
3172 // Strip out infinities, which give dygraphs problems later on.
3173 for (j
= 0; j
< row
.length
; j
++) {
3174 if (!isFinite(row
[j
])) row
[j
] = null;
3177 for (j
= 0; j
< cols
- 1; j
++) {
3178 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3181 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3188 this.warn("DataTable is out of order; order it correctly to speed loading.");
3189 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3191 this.rawData_
= ret
;
3193 if (annotations
.length
> 0) {
3194 this.setAnnotations(annotations
, true);
3196 this.attributes_
.reparseSeries();
3200 * Get the CSV data. If it's in a function, call that function. If it's in a
3201 * file, do an XMLHttpRequest to get it.
3204 Dygraph
.prototype.start_
= function() {
3205 var data
= this.file_
;
3207 // Functions can return references of all other types.
3208 if (typeof data
== 'function') {
3212 if (Dygraph
.isArrayLike(data
)) {
3213 this.rawData_
= this.parseArray_(data
);
3215 } else if (typeof data
== 'object' &&
3216 typeof data
.getColumnRange
== 'function') {
3217 // must be a DataTable from gviz.
3218 this.parseDataTable_(data
);
3220 } else if (typeof data
== 'string') {
3221 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3222 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3223 if (line_delimiter
) {
3224 this.loadedEvent_(data
);
3226 var req
= new XMLHttpRequest();
3228 req
.onreadystatechange
= function () {
3229 if (req
.readyState
== 4) {
3230 if (req
.status
=== 200 || // Normal http
3231 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3232 caller
.loadedEvent_(req
.responseText
);
3237 req
.open("GET", data
, true);
3241 this.error("Unknown data format: " + (typeof data
));
3246 * Changes various properties of the graph. These can include:
3248 * <li>file: changes the source data for the graph</li>
3249 * <li>errorBars: changes whether the data contains stddev</li>
3252 * There's a huge variety of options that can be passed to this method. For a
3253 * full list, see http://dygraphs.com/options.html.
3255 * @param {Object} attrs The new properties and values
3256 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3257 * call to updateOptions(). If you know better, you can pass true to explicitly
3258 * block the redraw. This can be useful for chaining updateOptions() calls,
3259 * avoiding the occasional infinite loop and preventing redraws when it's not
3260 * necessary (e.g. when updating a callback).
3262 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3263 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3265 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3266 var file
= input_attrs
.file
;
3267 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3269 // TODO(danvk): this is a mess. Move these options into attr_.
3270 if ('rollPeriod' in attrs
) {
3271 this.rollPeriod_
= attrs
.rollPeriod
;
3273 if ('dateWindow' in attrs
) {
3274 this.dateWindow_
= attrs
.dateWindow
;
3275 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3276 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3279 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3280 this.zoomed_y_
= (attrs
.valueRange
!== null);
3283 // TODO(danvk): validate per-series options.
3288 // highlightCircleSize
3290 // Check if this set options will require new points.
3291 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3293 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3295 this.attributes_
.reparseSeries();
3299 if (!block_redraw
) this.start_();
3301 if (!block_redraw
) {
3302 if (requiresNewPoints
) {
3305 this.renderGraph_(false);
3312 * Returns a copy of the options with deprecated names converted into current
3313 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3314 * interested in that, they should save a copy before calling this.
3317 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3319 for (var k
in attrs
) {
3320 if (k
== 'file') continue;
3321 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3324 var set
= function(axis
, opt
, value
) {
3325 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3326 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3327 my_attrs
.axes
[axis
][opt
] = value
;
3329 var map
= function(opt
, axis
, new_opt
) {
3330 if (typeof(attrs
[opt
]) != 'undefined') {
3331 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3332 new_opt
+ " option for the " + axis
+ " axis instead. " +
3333 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3334 "(see http://dygraphs.com/per-axis.html for more information.");
3335 set(axis
, new_opt
, attrs
[opt
]);
3336 delete my_attrs
[opt
];
3340 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3341 map('xValueFormatter', 'x', 'valueFormatter');
3342 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3343 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3344 map('xTicker', 'x', 'ticker');
3345 map('yValueFormatter', 'y', 'valueFormatter');
3346 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3347 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3348 map('yTicker', 'y', 'ticker');
3353 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3354 * containing div (which has presumably changed size since the dygraph was
3355 * instantiated. If the width/height are specified, the div will be resized.
3357 * This is far more efficient than destroying and re-instantiating a
3358 * Dygraph, since it doesn't have to reparse the underlying data.
3360 * @param {Number} [width] Width (in pixels)
3361 * @param {Number} [height] Height (in pixels)
3363 Dygraph
.prototype.resize
= function(width
, height
) {
3364 if (this.resize_lock
) {
3367 this.resize_lock
= true;
3369 if ((width
=== null) != (height
=== null)) {
3370 this.warn("Dygraph.resize() should be called with zero parameters or " +
3371 "two non-NULL parameters. Pretending it was zero.");
3372 width
= height
= null;
3375 var old_width
= this.width_
;
3376 var old_height
= this.height_
;
3379 this.maindiv_
.style
.width
= width
+ "px";
3380 this.maindiv_
.style
.height
= height
+ "px";
3381 this.width_
= width
;
3382 this.height_
= height
;
3384 this.width_
= this.maindiv_
.clientWidth
;
3385 this.height_
= this.maindiv_
.clientHeight
;
3388 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3389 // TODO(danvk): there should be a clear() method.
3390 this.maindiv_
.innerHTML
= "";
3391 this.roller_
= null;
3392 this.attrs_
.labelsDiv
= null;
3393 this.createInterface_();
3394 if (this.annotations_
.length
) {
3395 // createInterface_ reset the layout, so we need to do this.
3396 this.layout_
.setAnnotations(this.annotations_
);
3401 this.resize_lock
= false;
3405 * Adjusts the number of points in the rolling average. Updates the graph to
3406 * reflect the new averaging period.
3407 * @param {Number} length Number of points over which to average the data.
3409 Dygraph
.prototype.adjustRoll
= function(length
) {
3410 this.rollPeriod_
= length
;
3415 * Returns a boolean array of visibility statuses.
3417 Dygraph
.prototype.visibility
= function() {
3418 // Do lazy-initialization, so that this happens after we know the number of
3420 if (!this.attr_("visibility")) {
3421 this.attrs_
.visibility
= [];
3423 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3424 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3425 this.attrs_
.visibility
.push(true);
3427 return this.attr_("visibility");
3431 * Changes the visiblity of a series.
3433 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3434 var x
= this.visibility();
3435 if (num
< 0 || num
>= x
.length
) {
3436 this.warn("invalid series number in setVisibility: " + num
);
3444 * How large of an area will the dygraph render itself in?
3445 * This is used for testing.
3446 * @return A {width: w, height: h} object.
3449 Dygraph
.prototype.size
= function() {
3450 return { width
: this.width_
, height
: this.height_
};
3454 * Update the list of annotations and redraw the chart.
3455 * See dygraphs.com/annotations.html for more info on how to use annotations.
3456 * @param ann {Array} An array of annotation objects.
3457 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3459 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3460 // Only add the annotation CSS rule once we know it will be used.
3461 Dygraph
.addAnnotationRule();
3462 this.annotations_
= ann
;
3463 this.layout_
.setAnnotations(this.annotations_
);
3464 if (!suppressDraw
) {
3470 * Return the list of annotations.
3472 Dygraph
.prototype.annotations
= function() {
3473 return this.annotations_
;
3477 * Get the list of label names for this graph. The first column is the
3478 * x-axis, so the data series names start at index 1.
3480 Dygraph
.prototype.getLabels
= function() {
3481 return this.attr_("labels").slice();
3485 * Get the index of a series (column) given its name. The first column is the
3486 * x-axis, so the data series start with index 1.
3488 Dygraph
.prototype.indexFromSetName
= function(name
) {
3489 return this.setIndexByName_
[name
];
3493 * Get the internal dataset index given its name. These are numbered starting from 0,
3494 * and only count visible sets.
3497 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3498 return this.datasetIndex_
[this.indexFromSetName(name
)];
3503 * Adds a default style for the annotation CSS classes to the document. This is
3504 * only executed when annotations are actually used. It is designed to only be
3505 * called once -- all calls after the first will return immediately.
3507 Dygraph
.addAnnotationRule
= function() {
3508 // TODO(danvk): move this function into plugins/annotations.js
?
3509 if (Dygraph
.addedAnnotationCSS
) return;
3511 var rule
= "border: 1px solid black; " +
3512 "background-color: white; " +
3513 "text-align: center;";
3515 var styleSheetElement
= document
.createElement("style");
3516 styleSheetElement
.type
= "text/css";
3517 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3519 // Find the first style sheet that we can access.
3520 // We may not add a rule to a style sheet from another domain for security
3521 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3522 // adds its own style sheets from google.com.
3523 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3524 if (document
.styleSheets
[i
].disabled
) continue;
3525 var mysheet
= document
.styleSheets
[i
];
3527 if (mysheet
.insertRule
) { // Firefox
3528 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3529 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3530 } else if (mysheet
.addRule
) { // IE
3531 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3533 Dygraph
.addedAnnotationCSS
= true;
3536 // Was likely a security exception.
3540 this.warn("Unable to add default annotation CSS rule; display may be off.");
3543 // Older pages may still use this name.
3544 var DateGraph
= Dygraph
;