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, DygraphOptions: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
);
488 this.createDragInterface_();
494 * Triggers a cascade of events to the various plugins which are interested in them.
495 * Returns true if the "default behavior" should be performed, i.e. if none of
496 * the event listeners called event.preventDefault().
499 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
500 if (!(name
in this.eventListeners_
)) return true;
502 // QUESTION: can we use objects & prototypes to speed this up?
506 defaultPrevented
: false,
507 preventDefault
: function() {
508 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
509 e
.defaultPrevented
= true;
511 propagationStopped
: false,
512 stopPropagation
: function() {
513 e
.propagationStopped
= true;
516 Dygraph
.update(e
, extra_props
);
518 var callback_plugin_pairs
= this.eventListeners_
[name
];
519 if (callback_plugin_pairs
) {
520 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
521 var plugin
= callback_plugin_pairs
[i
][0];
522 var callback
= callback_plugin_pairs
[i
][1];
523 callback
.call(plugin
, e
);
524 if (e
.propagationStopped
) break;
527 return e
.defaultPrevented
;
531 * Returns the zoomed status of the chart for one or both axes.
533 * Axis is an optional parameter. Can be set to 'x' or 'y'.
535 * The zoomed status for an axis is set whenever a user zooms using the mouse
536 * or when the dateWindow or valueRange are updated (unless the
537 * isZoomedIgnoreProgrammaticZoom option is also specified).
539 Dygraph
.prototype.isZoomed
= function(axis
) {
540 if (axis
=== null || axis
=== undefined
) {
541 return this.zoomed_x_
|| this.zoomed_y_
;
543 if (axis
=== 'x') return this.zoomed_x_
;
544 if (axis
=== 'y') return this.zoomed_y_
;
545 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
549 * Returns information about the Dygraph object, including its containing ID.
551 Dygraph
.prototype.toString
= function() {
552 var maindiv
= this.maindiv_
;
553 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
554 return "[Dygraph " + id
+ "]";
559 * Returns the value of an option. This may be set by the user (either in the
560 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
562 * @param { String } name The name of the option, e.g. 'rollPeriod'.
563 * @param { String } [seriesName] The name of the series to which the option
564 * will be applied. If no per-series value of this option is available, then
565 * the global value is returned. This is optional.
566 * @return { ... } The value of the option.
568 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
569 // <REMOVE_FOR_COMBINED>
570 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
571 this.error('Must include options reference JS for testing');
572 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
573 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
574 'in the Dygraphs.OPTIONS_REFERENCE listing.');
575 // Only log this error once.
576 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
578 // </REMOVE_FOR_COMBINED
>
579 return seriesName
? this.attributes_
.getForSeries(name
, seriesName
) : this.attributes_
.get(name
);
583 * Returns the current value for an option, as set in the constructor or via
584 * updateOptions. You may pass in an (optional) series name to get per-series
585 * values for the option.
587 * All values returned by this method should be considered immutable. If you
588 * modify them, there is no guarantee that the changes will be honored or that
589 * dygraphs will remain in a consistent state. If you want to modify an option,
590 * use updateOptions() instead.
592 * @param { String } name The name of the option (e.g. 'strokeWidth')
593 * @param { String } [opt_seriesName] Series name to get per-series values.
594 * @return { ... } The value of the option.
596 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
597 return this.attr_(name
, opt_seriesName
);
600 Dygraph
.prototype.getOptionForAxis
= function(name
, axis
) {
601 return this.attributes_
.getForAxis(name
, axis
);
606 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
607 * @return { ... } A function mapping string -> option value
609 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
611 return function(opt
) {
612 var axis_opts
= self
.user_attrs_
.axes
;
613 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
614 return axis_opts
[axis
][opt
];
616 // user-specified attributes always trump defaults, even if they're less
618 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
619 return self
.user_attrs_
[opt
];
622 axis_opts
= self
.attrs_
.axes
;
623 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
624 return axis_opts
[axis
][opt
];
626 // check old-style axis options
627 // TODO(danvk): add a deprecation warning if either of these match.
628 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
629 return self
.axes_
[0][opt
];
630 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
631 return self
.axes_
[1][opt
];
633 return self
.attr_(opt
);
638 * Returns the current rolling period, as set by the user or an option.
639 * @return {Number} The number of points in the rolling window
641 Dygraph
.prototype.rollPeriod
= function() {
642 return this.rollPeriod_
;
646 * Returns the currently-visible x-range. This can be affected by zooming,
647 * panning or a call to updateOptions.
648 * Returns a two-element array: [left, right].
649 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
651 Dygraph
.prototype.xAxisRange
= function() {
652 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
656 * Returns the lower- and upper-bound x-axis values of the
659 Dygraph
.prototype.xAxisExtremes
= function() {
660 var left
= this.rawData_
[0][0];
661 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
662 return [left
, right
];
666 * Returns the currently-visible y-range for an axis. This can be affected by
667 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
668 * called with no arguments, returns the range of the first axis.
669 * Returns a two-element array: [bottom, top].
671 Dygraph
.prototype.yAxisRange
= function(idx
) {
672 if (typeof(idx
) == "undefined") idx
= 0;
673 if (idx
< 0 || idx
>= this.axes_
.length
) {
676 var axis
= this.axes_
[idx
];
677 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
681 * Returns the currently-visible y-ranges for each axis. This can be affected by
682 * zooming, panning, calls to updateOptions, etc.
683 * Returns an array of [bottom, top] pairs, one for each y-axis.
685 Dygraph
.prototype.yAxisRanges
= function() {
687 for (var i
= 0; i
< this.axes_
.length
; i
++) {
688 ret
.push(this.yAxisRange(i
));
693 // TODO(danvk): use these functions throughout dygraphs.
695 * Convert from data coordinates to canvas/div X/Y coordinates.
696 * If specified, do this conversion for the coordinate system of a particular
697 * axis. Uses the first axis by default.
698 * Returns a two-element array: [X, Y]
700 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
701 * instead of toDomCoords(null, y, axis).
703 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
704 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
708 * Convert from data x coordinates to canvas/div X coordinate.
709 * If specified, do this conversion for the coordinate system of a particular
711 * Returns a single value or null if x is null.
713 Dygraph
.prototype.toDomXCoord
= function(x
) {
718 var area
= this.plotter_
.area
;
719 var xRange
= this.xAxisRange();
720 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
724 * Convert from data x coordinates to canvas/div Y coordinate and optional
725 * axis. Uses the first axis by default.
727 * returns a single value or null if y is null.
729 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
730 var pct
= this.toPercentYCoord(y
, axis
);
735 var area
= this.plotter_
.area
;
736 return area
.y
+ pct
* area
.h
;
740 * Convert from canvas/div coords to data coordinates.
741 * If specified, do this conversion for the coordinate system of a particular
742 * axis. Uses the first axis by default.
743 * Returns a two-element array: [X, Y].
745 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
746 * instead of toDataCoords(null, y, axis).
748 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
749 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
753 * Convert from canvas/div x coordinate to data coordinate.
755 * If x is null, this returns null.
757 Dygraph
.prototype.toDataXCoord
= function(x
) {
762 var area
= this.plotter_
.area
;
763 var xRange
= this.xAxisRange();
764 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
768 * Convert from canvas/div y coord to value.
770 * If y is null, this returns null.
771 * if axis is null, this uses the first axis.
773 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
778 var area
= this.plotter_
.area
;
779 var yRange
= this.yAxisRange(axis
);
781 if (typeof(axis
) == "undefined") axis
= 0;
782 if (!this.axes_
[axis
].logscale
) {
783 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
785 // Computing the inverse of toDomCoord.
786 var pct
= (y
- area
.y
) / area
.h
;
788 // Computing the inverse of toPercentYCoord. The function was arrived at with
789 // the following steps:
791 // Original calcuation:
792 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
794 // Move denominator to both sides:
795 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
797 // subtract logr1, and take the negative value.
798 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
800 // Swap both sides of the equation, and we can compute the log of the
801 // return value. Which means we just need to use that as the exponent in
803 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
805 var logr1
= Dygraph
.log10(yRange
[1]);
806 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
807 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
813 * Converts a y for an axis to a percentage from the top to the
814 * bottom of the drawing area.
816 * If the coordinate represents a value visible on the canvas, then
817 * the value will be between 0 and 1, where 0 is the top of the canvas.
818 * However, this method will return values outside the range, as
819 * values can fall outside the canvas.
821 * If y is null, this returns null.
822 * if axis is null, this uses the first axis.
824 * @param { Number } y The data y-coordinate.
825 * @param { Number } [axis] The axis number on which the data coordinate lives.
826 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
828 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
832 if (typeof(axis
) == "undefined") axis
= 0;
834 var yRange
= this.yAxisRange(axis
);
837 var logscale
= this.attributes_
.getForAxis("logscale", axis
);
839 // yRange[1] - y is unit distance from the bottom.
840 // yRange[1] - yRange[0] is the scale of the range.
841 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
842 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
844 var logr1
= Dygraph
.log10(yRange
[1]);
845 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
851 * Converts an x value to a percentage from the left to the right of
854 * If the coordinate represents a value visible on the canvas, then
855 * the value will be between 0 and 1, where 0 is the left of the canvas.
856 * However, this method will return values outside the range, as
857 * values can fall outside the canvas.
859 * If x is null, this returns null.
860 * @param { Number } x The data x-coordinate.
861 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
863 Dygraph
.prototype.toPercentXCoord
= function(x
) {
868 var xRange
= this.xAxisRange();
869 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
873 * Returns the number of columns (including the independent variable).
874 * @return { Integer } The number of columns.
876 Dygraph
.prototype.numColumns
= function() {
877 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
881 * Returns the number of rows (excluding any header/label row).
882 * @return { Integer } The number of rows, less any header.
884 Dygraph
.prototype.numRows
= function() {
885 return this.rawData_
.length
;
889 * Returns the full range of the x-axis, as determined by the most extreme
890 * values in the data set. Not affected by zooming, visibility, etc.
891 * TODO(danvk): merge w/ xAxisExtremes
892 * @return { Array<Number> } A [low, high] pair
895 Dygraph
.prototype.fullXRange_
= function() {
896 if (this.numRows() > 0) {
897 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
904 * Returns the value in the given row and column. If the row and column exceed
905 * the bounds on the data, returns null. Also returns null if the value is
907 * @param { Number} row The row number of the data (0-based). Row 0 is the
908 * first row of data, not a header row.
909 * @param { Number} col The column number of the data (0-based)
910 * @return { Number } The value in the specified cell or null if the row/col
913 Dygraph
.prototype.getValue
= function(row
, col
) {
914 if (row
< 0 || row
> this.rawData_
.length
) return null;
915 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
917 return this.rawData_
[row
][col
];
921 * Generates interface elements for the Dygraph: a containing div, a div to
922 * display the current point, and a textbox to adjust the rolling average
923 * period. Also creates the Renderer/Layout elements.
926 Dygraph
.prototype.createInterface_
= function() {
927 // Create the all-enclosing graph div
928 var enclosing
= this.maindiv_
;
930 this.graphDiv
= document
.createElement("div");
931 this.graphDiv
.style
.width
= this.width_
+ "px";
932 this.graphDiv
.style
.height
= this.height_
+ "px";
933 enclosing
.appendChild(this.graphDiv
);
935 // Create the canvas for interactive parts of the chart.
936 this.canvas_
= Dygraph
.createCanvas();
937 this.canvas_
.style
.position
= "absolute";
938 this.canvas_
.width
= this.width_
;
939 this.canvas_
.height
= this.height_
;
940 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
941 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
943 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
945 // ... and for static parts of the chart.
946 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
947 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
949 // The interactive parts of the graph are drawn on top of the chart.
950 this.graphDiv
.appendChild(this.hidden_
);
951 this.graphDiv
.appendChild(this.canvas_
);
952 this.mouseEventElement_
= this.createMouseEventElement_();
954 // Create the grapher
955 this.layout_
= new DygraphLayout(this);
959 this.mouseMoveHandler
= function(e
) {
960 dygraph
.mouseMove_(e
);
962 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
964 this.mouseOutHandler
= function(e
) {
965 dygraph
.mouseOut_(e
);
967 this.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
969 this.resizeHandler
= function(e
) {
973 // Update when the window is resized.
974 // TODO(danvk): drop frames depending on complexity of the chart.
975 this.addEvent(window
, 'resize', this.resizeHandler
);
979 * Detach DOM elements in the dygraph and null out all data references.
980 * Calling this when you're done with a dygraph can dramatically reduce memory
981 * usage. See, e.g., the tests/perf.html example.
983 Dygraph
.prototype.destroy
= function() {
984 var removeRecursive
= function(node
) {
985 while (node
.hasChildNodes()) {
986 removeRecursive(node
.firstChild
);
987 node
.removeChild(node
.firstChild
);
991 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
992 var reg
= this.registeredEvents_
[idx
];
993 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
995 this.registeredEvents_
= [];
997 // remove mouse event handlers (This may not be necessary anymore)
998 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
999 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
1000 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
1001 removeRecursive(this.maindiv_
);
1003 var nullOut
= function(obj
) {
1004 for (var n
in obj
) {
1005 if (typeof(obj
[n
]) === 'object') {
1010 // remove event handlers
1011 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
1012 this.resizeHandler
= null;
1013 // These may not all be necessary, but it can't hurt...
1014 nullOut(this.layout_
);
1015 nullOut(this.plotter_
);
1020 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1021 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1022 * or the zoom rectangles) is done on this.canvas_.
1023 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1024 * @return {Object} The newly-created canvas
1027 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1028 var h
= Dygraph
.createCanvas();
1029 h
.style
.position
= "absolute";
1030 // TODO(danvk): h should be offset from canvas. canvas needs to include
1031 // some extra area to make it easier to zoom in on the far left and far
1032 // right. h needs to be precisely the plot area, so that clipping occurs.
1033 h
.style
.top
= canvas
.style
.top
;
1034 h
.style
.left
= canvas
.style
.left
;
1035 h
.width
= this.width_
;
1036 h
.height
= this.height_
;
1037 h
.style
.width
= this.width_
+ "px"; // for IE
1038 h
.style
.height
= this.height_
+ "px"; // for IE
1043 * Creates an overlay element used to handle mouse events.
1044 * @return {Object} The mouse event element.
1047 Dygraph
.prototype.createMouseEventElement_
= function() {
1048 if (this.isUsingExcanvas_
) {
1049 var elem
= document
.createElement("div");
1050 elem
.style
.position
= 'absolute';
1051 elem
.style
.backgroundColor
= 'white';
1052 elem
.style
.filter
= 'alpha(opacity=0)';
1053 elem
.style
.width
= this.width_
+ "px";
1054 elem
.style
.height
= this.height_
+ "px";
1055 this.graphDiv
.appendChild(elem
);
1058 return this.canvas_
;
1063 * Generate a set of distinct colors for the data series. This is done with a
1064 * color wheel. Saturation/Value are customizable, and the hue is
1065 * equally-spaced around the color wheel. If a custom set of colors is
1066 * specified, that is used instead.
1069 Dygraph
.prototype.setColors_
= function() {
1070 var labels
= this.getLabels();
1071 var num
= labels
.length
- 1;
1073 this.colorsMap_
= {};
1074 var colors
= this.attr_('colors');
1077 var sat
= this.attr_('colorSaturation') || 1.0;
1078 var val
= this.attr_('colorValue') || 0.5;
1079 var half
= Math
.ceil(num
/ 2);
1080 for (i
= 1; i
<= num
; i
++) {
1081 if (!this.visibility()[i
-1]) continue;
1082 // alternate colors for high contrast.
1083 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1084 var hue
= (1.0 * idx
/ (1 + num
));
1085 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1086 this.colors_
.push(colorStr
);
1087 this.colorsMap_
[labels
[i
]] = colorStr
;
1090 for (i
= 0; i
< num
; i
++) {
1091 if (!this.visibility()[i
]) continue;
1092 var colorStr
= colors
[i
% colors
.length
];
1093 this.colors_
.push(colorStr
);
1094 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1100 * Return the list of colors. This is either the list of colors passed in the
1101 * attributes or the autogenerated list of rgb(r,g,b) strings.
1102 * This does not return colors for invisible series.
1103 * @return {Array<string>} The list of colors.
1105 Dygraph
.prototype.getColors
= function() {
1106 return this.colors_
;
1110 * Returns a few attributes of a series, i.e. its color, its visibility, which
1111 * axis it's assigned to, and its column in the original data.
1112 * Returns null if the series does not exist.
1113 * Otherwise, returns an object with column, visibility, color and axis properties.
1114 * The "axis" property will be set to 1 for y1 and 2 for y2.
1115 * The "column" property can be fed back into getValue(row, column) to get
1116 * values for this series.
1118 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1120 var labels
= this.getLabels();
1121 for (var i
= 1; i
< labels
.length
; i
++) {
1122 if (labels
[i
] == series_name
) {
1127 if (idx
== -1) return null;
1132 visible
: this.visibility()[idx
- 1],
1133 color
: this.colorsMap_
[series_name
],
1134 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1139 * Create the text box to adjust the averaging period
1142 Dygraph
.prototype.createRollInterface_
= function() {
1143 // Create a roller if one doesn't exist already.
1144 if (!this.roller_
) {
1145 this.roller_
= document
.createElement("input");
1146 this.roller_
.type
= "text";
1147 this.roller_
.style
.display
= "none";
1148 this.graphDiv
.appendChild(this.roller_
);
1151 var display
= this.attr_('showRoller') ? 'block' : 'none';
1153 var area
= this.plotter_
.area
;
1154 var textAttr
= { "position": "absolute",
1156 "top": (area
.y
+ area
.h
- 25) + "px",
1157 "left": (area
.x
+ 1) + "px",
1160 this.roller_
.size
= "2";
1161 this.roller_
.value
= this.rollPeriod_
;
1162 for (var name
in textAttr
) {
1163 if (textAttr
.hasOwnProperty(name
)) {
1164 this.roller_
.style
[name
] = textAttr
[name
];
1169 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1174 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1175 * canvas (i.e. DOM Coords).
1177 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1178 return Dygraph
.pageX(e
) - context
.px
;
1183 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1184 * canvas (i.e. DOM Coords).
1186 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1187 return Dygraph
.pageY(e
) - context
.py
;
1191 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1195 Dygraph
.prototype.createDragInterface_
= function() {
1197 // Tracks whether the mouse is down right now
1199 isPanning
: false, // is this drag part of a pan?
1200 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1201 dragStartX
: null, // pixel coordinates
1202 dragStartY
: null, // pixel coordinates
1203 dragEndX
: null, // pixel coordinates
1204 dragEndY
: null, // pixel coordinates
1205 dragDirection
: null,
1206 prevEndX
: null, // pixel coordinates
1207 prevEndY
: null, // pixel coordinates
1208 prevDragDirection
: null,
1209 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1211 // The value on the left side of the graph when a pan operation starts.
1212 initialLeftmostDate
: null,
1214 // The number of units each pixel spans. (This won't be valid for log
1216 xUnitsPerPixel
: null,
1218 // TODO(danvk): update this comment
1219 // The range in second/value units that the viewport encompasses during a
1220 // panning operation.
1223 // Top-left corner of the canvas, in DOM coords
1224 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1228 // Values for use with panEdgeFraction, which limit how far outside the
1229 // graph's data boundaries it can be panned.
1230 boundedDates
: null, // [minDate, maxDate]
1231 boundedValues
: null, // [[minValue, maxValue] ...]
1233 // We cover iframes during mouse interactions. See comments in
1234 // dygraph-utils.js for more info on why this is a good idea.
1235 tarp
: new Dygraph
.IFrameTarp(),
1237 // contextB is the same thing as this context object but renamed.
1238 initializeMouseDown
: function(event
, g
, contextB
) {
1239 // prevents mouse drags from selecting page text.
1240 if (event
.preventDefault
) {
1241 event
.preventDefault(); // Firefox, Chrome, etc.
1243 event
.returnValue
= false; // IE
1244 event
.cancelBubble
= true;
1247 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1248 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1249 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1250 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1251 contextB
.cancelNextDblclick
= false;
1252 contextB
.tarp
.cover();
1256 var interactionModel
= this.attr_("interactionModel");
1258 // Self is the graph.
1261 // Function that binds the graph and context to the handler.
1262 var bindHandler
= function(handler
) {
1263 return function(event
) {
1264 handler(event
, self
, context
);
1268 for (var eventName
in interactionModel
) {
1269 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1270 this.addEvent(this.mouseEventElement_
, eventName
,
1271 bindHandler(interactionModel
[eventName
]));
1274 // If the user releases the mouse button during a drag, but not over the
1275 // canvas, then it doesn't count as a zooming action.
1276 this.mouseUpHandler_
= function(event
) {
1277 if (context
.isZooming
|| context
.isPanning
) {
1278 context
.isZooming
= false;
1279 context
.dragStartX
= null;
1280 context
.dragStartY
= null;
1283 if (context
.isPanning
) {
1284 context
.isPanning
= false;
1285 context
.draggingDate
= null;
1286 context
.dateRange
= null;
1287 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1288 delete self
.axes_
[i
].draggingValue
;
1289 delete self
.axes_
[i
].dragValueRange
;
1293 context
.tarp
.uncover();
1296 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1300 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1301 * up any previous zoom rectangles that were drawn. This could be optimized to
1302 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1305 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1306 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1307 * @param {Number} startX The X position where the drag started, in canvas
1309 * @param {Number} endX The current X position of the drag, in canvas coords.
1310 * @param {Number} startY The Y position where the drag started, in canvas
1312 * @param {Number} endY The current Y position of the drag, in canvas coords.
1313 * @param {Number} prevDirection the value of direction on the previous call to
1314 * this function. Used to avoid excess redrawing
1315 * @param {Number} prevEndX The value of endX on the previous call to this
1316 * function. Used to avoid excess redrawing
1317 * @param {Number} prevEndY The value of endY on the previous call to this
1318 * function. Used to avoid excess redrawing
1321 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1322 endY
, prevDirection
, prevEndX
,
1324 var ctx
= this.canvas_ctx_
;
1326 // Clean up from the previous rect if necessary
1327 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1328 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1329 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1330 } else if (prevDirection
== Dygraph
.VERTICAL
){
1331 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1332 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1335 // Draw a light-grey rectangle to show the new viewing area
1336 if (direction
== Dygraph
.HORIZONTAL
) {
1337 if (endX
&& startX
) {
1338 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1339 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1340 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1342 } else if (direction
== Dygraph
.VERTICAL
) {
1343 if (endY
&& startY
) {
1344 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1345 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1346 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1350 if (this.isUsingExcanvas_
) {
1351 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1356 * Clear the zoom rectangle (and perform no zoom).
1359 Dygraph
.prototype.clearZoomRect_
= function() {
1360 this.currentZoomRectArgs_
= null;
1361 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1365 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1366 * the canvas. The exact zoom window may be slightly larger if there are no data
1367 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1368 * which accepts dates that match the raw data. This function redraws the graph.
1370 * @param {Number} lowX The leftmost pixel value that should be visible.
1371 * @param {Number} highX The rightmost pixel value that should be visible.
1374 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1375 this.currentZoomRectArgs_
= null;
1376 // Find the earliest and latest dates contained in this canvasx range.
1377 // Convert the call to date ranges of the raw data.
1378 var minDate
= this.toDataXCoord(lowX
);
1379 var maxDate
= this.toDataXCoord(highX
);
1380 this.doZoomXDates_(minDate
, maxDate
);
1384 * Transition function to use in animations. Returns values between 0.0
1385 * (totally old values) and 1.0 (totally new values) for each frame.
1388 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1390 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1394 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1395 * method with doZoomX which accepts pixel coordinates. This function redraws
1398 * @param {Number} minDate The minimum date that should be visible.
1399 * @param {Number} maxDate The maximum date that should be visible.
1402 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1403 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1404 // can produce strange effects. Rather than the y-axis transitioning slowly
1405 // between values, it can jerk around.)
1406 var old_window
= this.xAxisRange();
1407 var new_window
= [minDate
, maxDate
];
1408 this.zoomed_x_
= true;
1410 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1411 if (that
.attr_("zoomCallback")) {
1412 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1418 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1419 * the canvas. This function redraws the graph.
1421 * @param {Number} lowY The topmost pixel value that should be visible.
1422 * @param {Number} highY The lowest pixel value that should be visible.
1425 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1426 this.currentZoomRectArgs_
= null;
1427 // Find the highest and lowest values in pixel range for each axis.
1428 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1429 // This is because pixels increase as you go down on the screen, whereas data
1430 // coordinates increase as you go up the screen.
1431 var oldValueRanges
= this.yAxisRanges();
1432 var newValueRanges
= [];
1433 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1434 var hi
= this.toDataYCoord(lowY
, i
);
1435 var low
= this.toDataYCoord(highY
, i
);
1436 newValueRanges
.push([low
, hi
]);
1439 this.zoomed_y_
= true;
1441 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1442 if (that
.attr_("zoomCallback")) {
1443 var xRange
= that
.xAxisRange();
1444 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1450 * Reset the zoom to the original view coordinates. This is the same as
1451 * double-clicking on the graph.
1453 Dygraph
.prototype.resetZoom
= function() {
1454 var dirty
= false, dirtyX
= false, dirtyY
= false;
1455 if (this.dateWindow_
!== null) {
1460 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1461 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1467 // Clear any selection, since it's likely to be drawn in the wrong place.
1468 this.clearSelection();
1471 this.zoomed_x_
= false;
1472 this.zoomed_y_
= false;
1474 var minDate
= this.rawData_
[0][0];
1475 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1477 // With only one frame, don't bother calculating extreme ranges.
1478 // TODO(danvk): merge this block w/ the code below
.
1479 if (!this.attr_("animatedZooms")) {
1480 this.dateWindow_
= null;
1481 for (i
= 0; i
< this.axes_
.length
; i
++) {
1482 if (this.axes_
[i
].valueWindow
!== null) {
1483 delete this.axes_
[i
].valueWindow
;
1487 if (this.attr_("zoomCallback")) {
1488 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1493 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1495 oldWindow
= this.xAxisRange();
1496 newWindow
= [minDate
, maxDate
];
1500 oldValueRanges
= this.yAxisRanges();
1501 // TODO(danvk): this is pretty inefficient
1502 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1503 var extremes
= packed
[1];
1505 // this has the side-effect of modifying this.axes_.
1506 // this doesn't make much sense in this context, but it's convenient (we
1507 // need this.axes_[*].extremeValues) and not harmful since we'll be
1508 // calling drawGraph_ shortly, which clobbers these values.
1509 this.computeYAxisRanges_(extremes
);
1511 newValueRanges
= [];
1512 for (i
= 0; i
< this.axes_
.length
; i
++) {
1513 var axis
= this.axes_
[i
];
1514 newValueRanges
.push((axis
.valueRange
!== null &&
1515 axis
.valueRange
!== undefined
) ?
1516 axis
.valueRange
: axis
.extremeRange
);
1521 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1523 that
.dateWindow_
= null;
1524 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1525 if (that
.axes_
[i
].valueWindow
!== null) {
1526 delete that
.axes_
[i
].valueWindow
;
1529 if (that
.attr_("zoomCallback")) {
1530 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1537 * Combined animation logic for all zoom functions.
1538 * either the x parameters or y parameters may be null.
1541 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1542 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1545 var valueRanges
= [];
1548 if (oldXRange
!== null && newXRange
!== null) {
1549 for (step
= 1; step
<= steps
; step
++) {
1550 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1551 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1552 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1556 if (oldYRanges
!== null && newYRanges
!== null) {
1557 for (step
= 1; step
<= steps
; step
++) {
1558 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1560 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1561 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1562 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1564 valueRanges
[step
-1] = thisRange
;
1569 Dygraph
.repeatAndCleanup(function(step
) {
1570 if (valueRanges
.length
) {
1571 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1572 var w
= valueRanges
[step
][i
];
1573 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1576 if (windows
.length
) {
1577 that
.dateWindow_
= windows
[step
];
1580 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1584 * Get the current graph's area object.
1586 * Returns: {x, y, w, h}
1588 Dygraph
.prototype.getArea
= function() {
1589 return this.plotter_
.area
;
1593 * Convert a mouse event to DOM coordinates relative to the graph origin.
1595 * Returns a two-element array: [X, Y].
1597 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1598 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1599 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1600 return [canvasx
, canvasy
];
1604 * Given a canvas X coordinate, find the closest row.
1605 * @param {Number} domX graph-relative DOM X coordinate
1606 * Returns: row number, integer
1609 Dygraph
.prototype.findClosestRow
= function(domX
) {
1610 var minDistX
= Infinity
;
1611 var pointIdx
= -1, setIdx
= -1;
1612 var sets
= this.layout_
.points
;
1613 for (var i
= 0; i
< sets
.length
; i
++) {
1614 var points
= sets
[i
];
1615 var len
= points
.length
;
1616 for (var j
= 0; j
< len
; j
++) {
1617 var point
= points
[j
];
1618 if (!Dygraph
.isValidPoint(point
, true)) continue;
1619 var dist
= Math
.abs(point
.canvasx
- domX
);
1620 if (dist
< minDistX
) {
1628 // TODO(danvk): remove this function; it's trivial and has only one use.
1629 return this.idxToRow_(setIdx
, pointIdx
);
1633 * Given canvas X,Y coordinates, find the closest point.
1635 * This finds the individual data point across all visible series
1636 * that's closest to the supplied DOM coordinates using the standard
1637 * Euclidean X,Y distance.
1639 * @param {Number} domX graph-relative DOM X coordinate
1640 * @param {Number} domY graph-relative DOM Y coordinate
1641 * Returns: {row, seriesName, point}
1644 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1645 var minDist
= Infinity
;
1647 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1648 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1649 var points
= this.layout_
.points
[setIdx
];
1650 for (var i
= 0; i
< points
.length
; ++i
) {
1651 var point
= points
[i
];
1652 if (!Dygraph
.isValidPoint(point
)) continue;
1653 dx
= point
.canvasx
- domX
;
1654 dy
= point
.canvasy
- domY
;
1655 dist
= dx
* dx
+ dy
* dy
;
1656 if (dist
< minDist
) {
1658 closestPoint
= point
;
1659 closestSeries
= setIdx
;
1664 var name
= this.layout_
.setNames
[closestSeries
];
1666 row
: idx
+ this.getLeftBoundary_(),
1673 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1675 * This first finds the X data point closest to the supplied DOM X coordinate,
1676 * then finds the series which puts the Y coordinate on top of its filled area,
1677 * using linear interpolation between adjacent point pairs.
1679 * @param {Number} domX graph-relative DOM X coordinate
1680 * @param {Number} domY graph-relative DOM Y coordinate
1681 * Returns: {row, seriesName, point}
1684 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1685 var row
= this.findClosestRow(domX
);
1686 var boundary
= this.getLeftBoundary_();
1687 var rowIdx
= row
- boundary
;
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 = */
1839 this.cascadeEvents_('select', {
1840 selectedX
: this.lastx_
,
1841 selectedPoints
: this.selPoints_
1843 // TODO(danvk): use defaultPrevented here?
1845 // Clear the previously drawn vertical, if there is one
1847 var ctx
= this.canvas_ctx_
;
1848 if (this.attr_('highlightSeriesOpts')) {
1849 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1850 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1852 // Activating background fade includes an animation effect for a gradual
1853 // fade. TODO(klausw): make this independently configurable if it causes
1854 // issues? Use a shared preference to control animations?
1855 var animateBackgroundFade
= true;
1856 if (animateBackgroundFade
) {
1857 if (opt_animFraction
=== undefined
) {
1858 // start a new animation
1859 this.animateSelection_(1);
1862 alpha
*= opt_animFraction
;
1864 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1865 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1868 // Redraw only the highlighted series in the interactive canvas (not the
1869 // static plot canvas, which is where series are usually drawn).
1870 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1871 } else if (this.previousVerticalX_
>= 0) {
1872 // Determine the maximum highlight circle size.
1873 var maxCircleSize
= 0;
1874 var labels
= this.attr_('labels');
1875 for (i
= 1; i
< labels
.length
; i
++) {
1876 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1877 if (r
> maxCircleSize
) maxCircleSize
= r
;
1879 var px
= this.previousVerticalX_
;
1880 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1881 2 * maxCircleSize
+ 2, this.height_
);
1884 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1885 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1888 if (this.selPoints_
.length
> 0) {
1889 // Draw colored circles over the center of each selected point
1890 var canvasx
= this.selPoints_
[0].canvasx
;
1892 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1893 var pt
= this.selPoints_
[i
];
1894 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1896 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1897 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1898 var color
= this.plotter_
.colors
[pt
.name
];
1900 callback
= Dygraph
.Circles
.DEFAULT
;
1902 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1903 ctx
.strokeStyle
= color
;
1904 ctx
.fillStyle
= color
;
1905 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1910 this.previousVerticalX_
= canvasx
;
1915 * Manually set the selected points and display information about them in the
1916 * legend. The selection can be cleared using clearSelection() and queried
1917 * using getSelection().
1918 * @param { Integer } row number that should be highlighted (i.e. appear with
1919 * hover dots on the chart). Set to false to clear any selection.
1920 * @param { seriesName } optional series name to highlight that series with the
1921 * the highlightSeriesOpts setting.
1922 * @param { locked } optional If true, keep seriesName selected when mousing
1923 * over the graph, disabling closest-series highlighting. Call clearSelection()
1926 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1927 // Extract the points we've selected
1928 this.selPoints_
= [];
1930 if (row
!== false) {
1931 row
-= this.getLeftBoundary_();
1934 var changed
= false;
1935 if (row
!== false && row
>= 0) {
1936 if (row
!= this.lastRow_
) changed
= true;
1937 this.lastRow_
= row
;
1938 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1939 var set
= this.layout_
.datasets
[setIdx
];
1940 if (row
< set
.length
) {
1941 var point
= this.layout_
.points
[setIdx
][row
];
1943 if (this.attr_("stackedGraph")) {
1944 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1947 if (point
.yval
!== null) this.selPoints_
.push(point
);
1951 if (this.lastRow_
>= 0) changed
= true;
1955 if (this.selPoints_
.length
) {
1956 this.lastx_
= this.selPoints_
[0].xval
;
1961 if (opt_seriesName
!== undefined
) {
1962 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1963 this.highlightSet_
= opt_seriesName
;
1966 if (opt_locked
!== undefined
) {
1967 this.lockedSet_
= opt_locked
;
1971 this.updateSelection_(undefined
);
1977 * The mouse has left the canvas. Clear out whatever artifacts remain
1978 * @param {Object} event the mouseout event from the browser.
1981 Dygraph
.prototype.mouseOut_
= function(event
) {
1982 if (this.attr_("unhighlightCallback")) {
1983 this.attr_("unhighlightCallback")(event
);
1986 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
1987 this.clearSelection();
1992 * Clears the current selection (i.e. points that were highlighted by moving
1993 * the mouse over the chart).
1995 Dygraph
.prototype.clearSelection
= function() {
1996 this.cascadeEvents_('deselect', {});
1998 this.lockedSet_
= false;
1999 // Get rid of the overlay data
2000 if (this.fadeLevel
) {
2001 this.animateSelection_(-1);
2004 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2006 this.selPoints_
= [];
2009 this.highlightSet_
= null;
2013 * Returns the number of the currently selected row. To get data for this row,
2014 * you can use the getValue method.
2015 * @return { Integer } row number, or -1 if nothing is selected
2017 Dygraph
.prototype.getSelection
= function() {
2018 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2022 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2023 var points
= this.layout_
.points
[setIdx
];
2024 for (var row
= 0; row
< points
.length
; row
++) {
2025 if (points
[row
].x
== this.selPoints_
[0].x
) {
2026 return row
+ this.getLeftBoundary_();
2034 * Returns the name of the currently-highlighted series.
2035 * Only available when the highlightSeriesOpts option is in use.
2037 Dygraph
.prototype.getHighlightSeries
= function() {
2038 return this.highlightSet_
;
2042 * Returns true if the currently-highlighted series was locked
2043 * via setSelection(..., seriesName, true).
2045 Dygraph
.prototype.isSeriesLocked
= function() {
2046 return this.lockedSet_
;
2050 * Fires when there's data available to be graphed.
2051 * @param {String} data Raw CSV data to be plotted
2054 Dygraph
.prototype.loadedEvent_
= function(data
) {
2055 this.rawData_
= this.parseCSV_(data
);
2060 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2063 Dygraph
.prototype.addXTicks_
= function() {
2064 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2066 if (this.dateWindow_
) {
2067 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2069 range
= this.fullXRange_();
2072 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2073 var xTicks
= xAxisOptionsView('ticker')(
2076 this.width_
, // TODO(danvk): should be area.width
2079 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2080 // console.log(msg);
2081 this.layout_
.setXTicks(xTicks
);
2086 * Computes the range of the data series (including confidence intervals).
2087 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2088 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2089 * @return [low, high]
2091 Dygraph
.prototype.extremeValues_
= function(series
) {
2092 var minY
= null, maxY
= null, j
, y
;
2094 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2096 // With custom bars, maxY is the max of the high values.
2097 for (j
= 0; j
< series
.length
; j
++) {
2098 y
= series
[j
][1][0];
2099 if (y
=== null || isNaN(y
)) continue;
2100 var low
= y
- series
[j
][1][1];
2101 var high
= y
+ series
[j
][1][2];
2102 if (low
> y
) low
= y
; // this can happen with custom bars,
2103 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2104 if (maxY
=== null || high
> maxY
) {
2107 if (minY
=== null || low
< minY
) {
2112 for (j
= 0; j
< series
.length
; j
++) {
2114 if (y
=== null || isNaN(y
)) continue;
2115 if (maxY
=== null || y
> maxY
) {
2118 if (minY
=== null || y
< minY
) {
2124 return [minY
, maxY
];
2129 * This function is called once when the chart's data is changed or the options
2130 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2131 * idea is that values derived from the chart's data can be computed here,
2132 * rather than every time the chart is drawn. This includes things like the
2133 * number of axes, rolling averages, etc.
2135 Dygraph
.prototype.predraw_
= function() {
2136 var start
= new Date();
2138 this.layout_
.computePlotArea();
2140 // TODO(danvk): move more computations out of drawGraph_ and into here.
2141 this.computeYAxes_();
2143 // Create a new plotter.
2144 if (this.plotter_
) {
2145 this.cascadeEvents_('clearChart');
2146 this.plotter_
.clear();
2148 this.plotter_
= new DygraphCanvasRenderer(this,
2153 // The roller sits in the bottom left corner of the chart. We don't know where
2154 // this will be until the options are available, so it's positioned here.
2155 this.createRollInterface_();
2157 this.cascadeEvents_('predraw');
2159 // Convert the raw data (a 2D array) into the internal format and compute
2160 // rolling averages.
2161 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2162 for (var i
= 1; i
< this.numColumns(); i
++) {
2163 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2164 var logScale
= this.attr_('logscale');
2165 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2166 series
= this.rollingAverage(series
, this.rollPeriod_
);
2167 this.rolledSeries_
.push(series
);
2170 // If the data or options have changed, then we'd better redraw.
2173 // This is used to determine whether to do various animations.
2174 var end
= new Date();
2175 this.drawingTimeMs_
= (end
- start
);
2179 * Loop over all fields and create datasets, calculating extreme y-values for
2180 * each series and extreme x-indices as we go.
2182 * dateWindow is passed in as an explicit parameter so that we can compute
2183 * extreme values "speculatively", i.e. without actually setting state on the
2186 * TODO(danvk): make this more of a true function
2187 * @return [ datasets, seriesExtremes, boundaryIds ]
2190 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2191 var boundaryIds
= [];
2192 var cumulative_y
= []; // For stacked series.
2194 var extremes
= {}; // series name -> [low, high]
2197 // Loop over the fields (series). Go from the last to the first,
2198 // because if they're stacked that's how we accumulate the values.
2199 var num_series
= rolledSeries
.length
- 1;
2200 for (i
= num_series
; i
>= 1; i
--) {
2201 if (!this.visibility()[i
- 1]) continue;
2203 // Note: this copy _is_ necessary at the moment.
2204 // If you remove it, it breaks zooming with error bars on.
2205 // TODO(danvk): investigate further & write a test for this.
2207 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2208 series
.push(rolledSeries
[i
][j
]);
2211 // Prune down to the desired range, if necessary (for zooming)
2212 // Because there can be lines going to points outside of the visible area,
2213 // we actually prune to visible points, plus one on either side.
2214 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2216 var low
= dateWindow
[0];
2217 var high
= dateWindow
[1];
2219 // TODO(danvk): do binary search instead of linear search.
2220 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2221 var firstIdx
= null, lastIdx
= null;
2222 for (k
= 0; k
< series
.length
; k
++) {
2223 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2226 if (series
[k
][0] <= high
) {
2230 if (firstIdx
=== null) firstIdx
= 0;
2231 if (firstIdx
> 0) firstIdx
--;
2232 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2233 if (lastIdx
< series
.length
- 1) lastIdx
++;
2234 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2235 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2236 pruned
.push(series
[k
]);
2240 boundaryIds
[i
-1] = [0, series
.length
-1];
2243 var seriesExtremes
= this.extremeValues_(series
);
2246 for (j
=0; j
<series
.length
; j
++) {
2247 series
[j
] = [series
[j
][0],
2252 } else if (this.attr_("stackedGraph")) {
2253 var l
= series
.length
;
2255 for (j
= 0; j
< l
; j
++) {
2256 // If one data set has a NaN, let all subsequent stacked
2257 // sets inherit the NaN -- only start at 0 for the first set.
2258 var x
= series
[j
][0];
2259 if (cumulative_y
[x
] === undefined
) {
2260 cumulative_y
[x
] = 0;
2263 actual_y
= series
[j
][1];
2264 if (actual_y
=== null) {
2265 series
[j
] = [x
, null];
2269 cumulative_y
[x
] += actual_y
;
2271 series
[j
] = [x
, cumulative_y
[x
]];
2273 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2274 seriesExtremes
[1] = cumulative_y
[x
];
2276 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2277 seriesExtremes
[0] = cumulative_y
[x
];
2282 var seriesName
= this.attr_("labels")[i
];
2283 extremes
[seriesName
] = seriesExtremes
;
2284 datasets
[i
] = series
;
2287 // For stacked graphs, a NaN value for any point in the sum should create a
2288 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2289 if (this.attr_("stackedGraph")) {
2290 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2291 // Use the first nonempty dataset to get X values.
2292 if (!datasets
[k
]) continue;
2293 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2294 var x
= datasets
[k
][j
][0];
2295 if (isNaN(cumulative_y
[x
])) {
2296 // Set all Y values to NaN at that X value.
2297 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2298 if (!datasets
[i
]) continue;
2299 datasets
[i
][j
][1] = NaN
;
2307 return [ datasets
, extremes
, boundaryIds
];
2311 * Update the graph with new data. This method is called when the viewing area
2312 * has changed. If the underlying data or options have changed, predraw_ will
2313 * be called before drawGraph_ is called.
2317 Dygraph
.prototype.drawGraph_
= function() {
2318 var start
= new Date();
2320 // This is used to set the second parameter to drawCallback, below.
2321 var is_initial_draw
= this.is_initial_draw_
;
2322 this.is_initial_draw_
= false;
2324 this.layout_
.removeAllDatasets();
2326 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2328 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2329 var datasets
= packed
[0];
2330 var extremes
= packed
[1];
2331 this.boundaryIds_
= packed
[2];
2333 this.setIndexByName_
= {};
2334 var labels
= this.attr_("labels");
2335 if (labels
.length
> 0) {
2336 this.setIndexByName_
[labels
[0]] = 0;
2339 for (var i
= 1; i
< datasets
.length
; i
++) {
2340 this.setIndexByName_
[labels
[i
]] = i
;
2341 if (!this.visibility()[i
- 1]) continue;
2342 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2343 this.datasetIndex_
[i
] = dataIdx
++;
2346 this.computeYAxisRanges_(extremes
);
2347 this.layout_
.setYAxes(this.axes_
);
2351 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2352 var tmp_zoomed_x
= this.zoomed_x_
;
2353 // Tell PlotKit to use this new data and render itself
2354 this.layout_
.setDateWindow(this.dateWindow_
);
2355 this.zoomed_x_
= tmp_zoomed_x
;
2356 this.layout_
.evaluateWithError();
2357 this.renderGraph_(is_initial_draw
);
2359 if (this.attr_("timingName")) {
2360 var end
= new Date();
2361 Dygraph
.info(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2366 * This does the work of drawing the chart. It assumes that the layout and axis
2367 * scales have already been set (e.g. by predraw_).
2371 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2372 this.cascadeEvents_('clearChart');
2373 this.plotter_
.clear();
2375 if (this.attr_('underlayCallback')) {
2376 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2377 // users who expect a deprecated form of this callback.
2378 this.attr_('underlayCallback')(
2379 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2383 canvas
: this.hidden_
,
2384 drawingContext
: this.hidden_ctx_
2386 this.cascadeEvents_('willDrawChart', e
);
2387 this.plotter_
.render();
2388 this.cascadeEvents_('didDrawChart', e
);
2390 // TODO(danvk): is this a performance bottleneck when panning?
2391 // The interaction canvas should already be empty in that situation.
2392 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2393 this.canvas_
.height
);
2395 if (this.attr_("drawCallback") !== null) {
2396 this.attr_("drawCallback")(this, is_initial_draw
);
2402 * Determine properties of the y-axes which are independent of the data
2403 * currently being displayed. This includes things like the number of axes and
2404 * the style of the axes. It does not include the range of each axis and its
2406 * This fills in this.axes_.
2407 * axes_ = [ { options } ]
2408 * indices are into the axes_ array.
2410 Dygraph
.prototype.computeYAxes_
= function() {
2411 // Preserve valueWindow settings if they exist, and if the user hasn't
2412 // specified a new valueRange.
2413 var valueWindows
, axis
, index
, opts
, v
;
2414 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2416 for (index
= 0; index
< this.axes_
.length
; index
++) {
2417 valueWindows
.push(this.axes_
[index
].valueWindow
);
2421 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2422 // data computation as well as options storage.
2423 // Go through once and add all the axes.
2426 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2427 // Add a new axis, making a copy of its per-axis options.
2428 opts
= { g
: this };
2429 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2430 this.axes_
[axis
] = opts
;
2434 // Copy global valueRange option over to the first axis.
2435 // NOTE(konigsberg): Are these two statements necessary?
2436 // I tried removing it. The automated tests pass, and manually
2437 // messing with tests/zoom
.html showed no trouble
.
2438 v
= this.attr_('valueRange');
2439 if (v
) this.axes_
[0].valueRange
= v
;
2441 if (valueWindows
!== undefined
) {
2442 // Restore valueWindow settings.
2443 for (index
= 0; index
< valueWindows
.length
; index
++) {
2444 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2448 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2450 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2451 v
= opts("valueRange");
2452 if (v
) this.axes_
[axis
].valueRange
= v
;
2453 } else { // To keep old behavior
2454 var axes
= this.user_attrs_
.axes
;
2455 if (axes
&& axes
.y2
) {
2456 v
= axes
.y2
.valueRange
;
2457 if (v
) this.axes_
[axis
].valueRange
= v
;
2464 * Returns the number of y-axes on the chart.
2465 * @return {Number} the number of axes.
2467 Dygraph
.prototype.numAxes
= function() {
2468 return this.attributes_
.numAxes();
2473 * Returns axis properties for the given series.
2474 * @param { String } setName The name of the series for which to get axis
2475 * properties, e.g. 'Y1'.
2476 * @return { Object } The axis properties.
2478 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2479 // TODO(danvk): handle errors.
2480 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2485 * Determine the value range and tick marks for each axis.
2486 * @param {Object} extremes A mapping from seriesName -> [low, high]
2487 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2489 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2491 var numAxes
= this.attributes_
.numAxes();
2493 // Compute extreme values, a span and tick marks for each axis.
2494 for (var i
= 0; i
< numAxes
; i
++) {
2495 var axis
= this.axes_
[i
];
2496 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2497 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2498 series
= this.attributes_
.seriesForAxis(i
);
2500 if (series
.length
=== 0) {
2501 // If no series are defined or visible then use a reasonable default
2502 axis
.extremeRange
= [0, 1];
2504 // Calculate the extremes of extremes.
2505 var minY
= Infinity
; // extremes[series[0]][0];
2506 var maxY
= -Infinity
; // extremes[series[0]][1];
2507 var extremeMinY
, extremeMaxY
;
2509 for (var j
= 0; j
< series
.length
; j
++) {
2510 // this skips invisible series
2511 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2513 // Only use valid extremes to stop null data series' from corrupting the scale.
2514 extremeMinY
= extremes
[series
[j
]][0];
2515 if (extremeMinY
!== null) {
2516 minY
= Math
.min(extremeMinY
, minY
);
2518 extremeMaxY
= extremes
[series
[j
]][1];
2519 if (extremeMaxY
!== null) {
2520 maxY
= Math
.max(extremeMaxY
, maxY
);
2523 if (includeZero
&& minY
> 0) minY
= 0;
2525 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2526 if (minY
== Infinity
) minY
= 0;
2527 if (maxY
== -Infinity
) maxY
= 1;
2529 // Add some padding and round up to an integer to be human-friendly.
2530 var span
= maxY
- minY
;
2531 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2532 if (span
=== 0) { span
= maxY
; }
2534 var maxAxisY
, minAxisY
;
2536 maxAxisY
= maxY
+ 0.1 * span
;
2539 maxAxisY
= maxY
+ 0.1 * span
;
2540 minAxisY
= minY
- 0.1 * span
;
2542 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2543 if (!this.attr_("avoidMinZero")) {
2544 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2545 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2548 if (this.attr_("includeZero")) {
2549 if (maxY
< 0) maxAxisY
= 0;
2550 if (minY
> 0) minAxisY
= 0;
2553 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2555 if (axis
.valueWindow
) {
2556 // This is only set if the user has zoomed on the y-axis. It is never set
2557 // by a user. It takes precedence over axis.valueRange because, if you set
2558 // valueRange, you'd still expect to be able to pan.
2559 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2560 } else if (axis
.valueRange
) {
2561 // This is a user-set value range for this axis.
2562 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2564 axis
.computedValueRange
= axis
.extremeRange
;
2567 // Add ticks. By default, all axes inherit the tick positions of the
2568 // primary axis. However, if an axis is specifically marked as having
2569 // independent ticks, then that is permissible as well.
2570 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2571 var ticker
= opts('ticker');
2572 if (i
=== 0 || axis
.independentTicks
) {
2573 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2574 axis
.computedValueRange
[1],
2575 this.height_
, // TODO(danvk): should be area.height
2579 var p_axis
= this.axes_
[0];
2580 var p_ticks
= p_axis
.ticks
;
2581 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2582 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2583 var tick_values
= [];
2584 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2585 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2586 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2587 tick_values
.push(y_val
);
2590 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2591 axis
.computedValueRange
[1],
2592 this.height_
, // TODO(danvk): should be area.height
2601 * Extracts one series from the raw data (a 2D array) into an array of (date,
2604 * This is where undesirable points (i.e. negative values on log scales and
2605 * missing values through which we wish to connect lines) are dropped.
2606 * TODO(danvk): the "missing values" bit above doesn't seem right.
2610 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2611 // TODO(danvk): pre-allocate series here.
2613 for (var j
= 0; j
< rawData
.length
; j
++) {
2614 var x
= rawData
[j
][0];
2615 var point
= rawData
[j
][i
];
2617 // On the log scale, points less than zero do not exist.
2618 // This will create a gap in the chart.
2623 series
.push([x
, point
]);
2630 * Calculates the rolling average of a data set.
2631 * If originalData is [label, val], rolls the average of those.
2632 * If originalData is [label, [, it's interpreted as [value, stddev]
2633 * and the roll is returned in the same form, with appropriately reduced
2634 * stddev for each value.
2635 * Note that this is where fractional input (i.e. '5/10') is converted into
2637 * @param {Array} originalData The data in the appropriate format (see above)
2638 * @param {Number} rollPeriod The number of points over which to average the
2641 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2642 if (originalData
.length
< 2)
2643 return originalData
;
2644 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2645 var rollingData
= [];
2646 var sigma
= this.attr_("sigma");
2648 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2649 if (this.fractions_
) {
2651 var den
= 0; // numerator/denominator
2653 for (i
= 0; i
< originalData
.length
; i
++) {
2654 num
+= originalData
[i
][1][0];
2655 den
+= originalData
[i
][1][1];
2656 if (i
- rollPeriod
>= 0) {
2657 num
-= originalData
[i
- rollPeriod
][1][0];
2658 den
-= originalData
[i
- rollPeriod
][1][1];
2661 var date
= originalData
[i
][0];
2662 var value
= den
? num
/ den
: 0.0;
2663 if (this.attr_("errorBars")) {
2664 if (this.attr_("wilsonInterval")) {
2665 // For more details on this confidence interval, see:
2666 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2668 var p
= value
< 0 ? 0 : value
, n
= den
;
2669 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2670 var denom
= 1 + sigma
* sigma
/ den
;
2671 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2672 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2673 rollingData
[i
] = [date
,
2674 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2676 rollingData
[i
] = [date
, [0, 0, 0]];
2679 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2680 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2683 rollingData
[i
] = [date
, mult
* value
];
2686 } else if (this.attr_("customBars")) {
2691 for (i
= 0; i
< originalData
.length
; i
++) {
2692 var data
= originalData
[i
][1];
2694 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2696 if (y
!== null && !isNaN(y
)) {
2702 if (i
- rollPeriod
>= 0) {
2703 var prev
= originalData
[i
- rollPeriod
];
2704 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2712 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2713 1.0 * (mid
- low
) / count
,
2714 1.0 * (high
- mid
) / count
]];
2716 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2720 // Calculate the rolling average for the first rollPeriod - 1 points where
2721 // there is not enough data to roll over the full number of points
2722 if (!this.attr_("errorBars")){
2723 if (rollPeriod
== 1) {
2724 return originalData
;
2727 for (i
= 0; i
< originalData
.length
; i
++) {
2730 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2731 y
= originalData
[j
][1];
2732 if (y
=== null || isNaN(y
)) continue;
2734 sum
+= originalData
[j
][1];
2737 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2739 rollingData
[i
] = [originalData
[i
][0], null];
2744 for (i
= 0; i
< originalData
.length
; i
++) {
2748 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2749 y
= originalData
[j
][1][0];
2750 if (y
=== null || isNaN(y
)) continue;
2752 sum
+= originalData
[j
][1][0];
2753 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2756 stddev
= Math
.sqrt(variance
) / num_ok
;
2757 rollingData
[i
] = [originalData
[i
][0],
2758 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2760 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2770 * Detects the type of the str (date or numeric) and sets the various
2771 * formatting attributes in this.attrs_ based on this type.
2772 * @param {String} str An x value.
2775 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2777 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2778 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2779 str
.indexOf('/') >= 0 ||
2780 isNaN(parseFloat(str
))) {
2782 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2783 // TODO(danvk): remove support for this format.
2787 this.setXAxisOptions_(isDate
);
2790 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2792 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2793 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2794 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2795 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2797 /** @private (shut up, jsdoc!) */
2798 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2799 // TODO(danvk): use Dygraph.numberValueFormatter here?
2800 /** @private (shut up, jsdoc!) */
2801 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2802 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2803 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2808 * Parses the value as a floating point number. This is like the parseFloat()
2809 * built-in, but with a few differences:
2810 * - the empty string is parsed as null, rather than NaN.
2811 * - if the string cannot be parsed at all, an error is logged.
2812 * If the string can't be parsed, this method returns null.
2813 * @param {String} x The string to be parsed
2814 * @param {Number} opt_line_no The line number from which the string comes.
2815 * @param {String} opt_line The text of the line from which the string comes.
2819 // Parse the x as a float or return null if it's not a number.
2820 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2821 var val
= parseFloat(x
);
2822 if (!isNaN(val
)) return val
;
2824 // Try to figure out what happeend.
2825 // If the value is the empty string, parse it as null.
2826 if (/^ *$/.test(x
)) return null;
2828 // If it was actually "NaN", return it as NaN.
2829 if (/^ *nan *$/i.test(x
)) return NaN
;
2831 // Looks like a parsing error.
2832 var msg
= "Unable to parse '" + x
+ "' as a number";
2833 if (opt_line
!== null && opt_line_no
!== null) {
2834 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2843 * Parses a string in a special csv format. We expect a csv file where each
2844 * line is a date point, and the first field in each line is the date string.
2845 * We also expect that all remaining fields represent series.
2846 * if the errorBars attribute is set, then interpret the fields as:
2847 * date, series1, stddev1, series2, stddev2, ...
2848 * @param {[Object]} data See above.
2850 * @return [Object] An array with one entry for each row. These entries
2851 * are an array of cells in that row. The first entry is the parsed x-value for
2852 * the row. The second, third, etc. are the y-values. These can take on one of
2853 * three forms, depending on the CSV and constructor parameters:
2855 * 2. [ value, stddev ]
2856 * 3. [ low value, center value, high value ]
2858 Dygraph
.prototype.parseCSV_
= function(data
) {
2860 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2861 var lines
= data
.split(line_delimiter
|| "\n");
2864 // Use the default delimiter or fall back to a tab if that makes sense.
2865 var delim
= this.attr_('delimiter');
2866 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2871 if (!('labels' in this.user_attrs_
)) {
2872 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2874 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2875 this.attributes_
.reparseSeries();
2880 var defaultParserSet
= false; // attempt to auto-detect x value type
2881 var expectedCols
= this.attr_("labels").length
;
2882 var outOfOrder
= false;
2883 for (var i
= start
; i
< lines
.length
; i
++) {
2884 var line
= lines
[i
];
2886 if (line
.length
=== 0) continue; // skip blank lines
2887 if (line
[0] == '#') continue; // skip comment lines
2888 var inFields
= line
.split(delim
);
2889 if (inFields
.length
< 2) continue;
2892 if (!defaultParserSet
) {
2893 this.detectTypeFromString_(inFields
[0]);
2894 xParser
= this.attr_("xValueParser");
2895 defaultParserSet
= true;
2897 fields
[0] = xParser(inFields
[0], this);
2899 // If fractions are expected, parse the numbers as "A/B
"
2900 if (this.fractions_) {
2901 for (j = 1; j < inFields.length; j++) {
2902 // TODO(danvk): figure out an appropriate way to flag parse errors.
2903 vals = inFields[j].split("/");
2904 if (vals.length != 2) {
2905 this.error('Expected fractional "num
/den
" values in CSV data ' +
2906 "but found a value
'" + inFields[j] + "' on line
" +
2907 (1 + i) + " ('" + line + "') which is not of
this form
.");
2910 fields[j] = [this.parseFloat_(vals[0], i, line),
2911 this.parseFloat_(vals[1], i, line)];
2914 } else if (this.attr_("errorBars
")) {
2915 // If there are error bars, values are (value, stddev) pairs
2916 if (inFields.length % 2 != 1) {
2917 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2918 'but line ' + (1 + i) + ' has an odd number of values (' +
2919 (inFields.length - 1) + "): '" + line + "'");
2921 for (j = 1; j < inFields.length; j += 2) {
2922 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2923 this.parseFloat_(inFields[j + 1], i, line)];
2925 } else if (this.attr_("customBars
")) {
2926 // Bars are a low;center;high tuple
2927 for (j = 1; j < inFields.length; j++) {
2928 var val = inFields[j];
2929 if (/^ *$/.test(val)) {
2930 fields[j] = [null, null, null];
2932 vals = val.split(";");
2933 if (vals.length == 3) {
2934 fields[j] = [ this.parseFloat_(vals[0], i, line),
2935 this.parseFloat_(vals[1], i, line),
2936 this.parseFloat_(vals[2], i, line) ];
2938 this.warn('When using customBars, values must be either blank ' +
2939 'or "low
;center
;high
" tuples (got "' + val +
2940 '" on line ' + (1+i));
2945 // Values are just numbers
2946 for (j = 1; j < inFields.length; j++) {
2947 fields[j] = this.parseFloat_(inFields[j], i, line);
2950 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2954 if (fields.length != expectedCols) {
2955 this.error("Number of columns
in line
" + i + " (" + fields.length +
2956 ") does not agree
with number of
labels (" + expectedCols +
2960 // If the user specified the 'labels' option and none of the cells of the
2961 // first row parsed correctly, then they probably double-specified the
2962 // labels. We go with the values set in the option, discard this row and
2963 // log a warning to the JS console.
2964 if (i === 0 && this.attr_('labels')) {
2965 var all_null = true;
2966 for (j = 0; all_null && j < fields.length; j++) {
2967 if (fields[j]) all_null = false;
2970 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2971 "CSV
data ('" + line + "') appears to also contain labels
. " +
2972 "Will drop the CSV labels and
use the option labels
.");
2980 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2981 ret.sort(function(a,b) { return a[0] - b[0]; });
2989 * The user has provided their data as a pre-packaged JS array. If the x values
2990 * are numeric, this is the same as dygraphs' internal format. If the x values
2991 * are dates, we need to convert them from Date objects to ms since epoch.
2992 * @param {[Object]} data
2993 * @return {[Object]} data with numeric x values.
2995 Dygraph.prototype.parseArray_ = function(data) {
2996 // Peek at the first x value to see if it's numeric.
2997 if (data.length === 0) {
2998 this.error("Can
't plot empty data set");
3001 if (data[0].length === 0) {
3002 this.error("Data set cannot contain an empty row");
3007 if (this.attr_("labels") === null) {
3008 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3009 "in the options parameter");
3010 this.attrs_.labels = [ "X" ];
3011 for (i = 1; i < data[0].length; i++) {
3012 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3014 this.attributes_.reparseSeries();
3016 var num_labels = this.attr_("labels");
3017 if (num_labels.length != data[0].length) {
3018 this.error("Mismatch between number of labels (" + num_labels +
3019 ") and number of columns in array (" + data[0].length + ")");
3024 if (Dygraph.isDateLike(data[0][0])) {
3025 // Some intelligent defaults for a date x-axis.
3026 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3027 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3028 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3030 // Assume they're all dates
.
3031 var parsedData
= Dygraph
.clone(data
);
3032 for (i
= 0; i
< data
.length
; i
++) {
3033 if (parsedData
[i
].length
=== 0) {
3034 this.error("Row " + (1 + i
) + " of data is empty");
3037 if (parsedData
[i
][0] === null ||
3038 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3039 isNaN(parsedData
[i
][0].getTime())) {
3040 this.error("x value in row " + (1 + i
) + " is not a Date");
3043 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3047 // Some intelligent defaults for a numeric x-axis.
3048 /** @private (shut up, jsdoc!) */
3049 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3050 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3051 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3057 * Parses a DataTable object from gviz.
3058 * The data is expected to have a first column that is either a date or a
3059 * number. All subsequent columns must be numbers. If there is a clear mismatch
3060 * between this.xValueParser_ and the type of the first column, it will be
3061 * fixed. Fills out rawData_.
3062 * @param {[Object]} data See above.
3065 Dygraph
.prototype.parseDataTable_
= function(data
) {
3066 var shortTextForAnnotationNum
= function(num
) {
3067 // converts [0-9]+ [A-Z][a-z]*
3068 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3069 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3070 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3071 num
= Math
.floor(num
/ 26);
3073 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3074 num
= Math
.floor((num
- 1) / 26);
3079 var cols
= data
.getNumberOfColumns();
3080 var rows
= data
.getNumberOfRows();
3082 var indepType
= data
.getColumnType(0);
3083 if (indepType
== 'date' || indepType
== 'datetime') {
3084 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3085 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3086 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3087 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3088 } else if (indepType
== 'number') {
3089 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3090 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3091 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3092 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3094 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3095 "column 1 of DataTable input (Got '" + indepType
+ "')");
3099 // Array of the column indices which contain data (and not annotations).
3101 var annotationCols
= {}; // data index -> [annotation cols]
3102 var hasAnnotations
= false;
3104 for (i
= 1; i
< cols
; i
++) {
3105 var type
= data
.getColumnType(i
);
3106 if (type
== 'number') {
3108 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3109 // This is OK -- it's an annotation column.
3110 var dataIdx
= colIdx
[colIdx
.length
- 1];
3111 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3112 annotationCols
[dataIdx
] = [i
];
3114 annotationCols
[dataIdx
].push(i
);
3116 hasAnnotations
= true;
3118 this.error("Only 'number' is supported as a dependent type with Gviz." +
3119 " 'string' is only supported if displayAnnotations is true");
3123 // Read column labels
3124 // TODO(danvk): add support back for errorBars
3125 var labels
= [data
.getColumnLabel(0)];
3126 for (i
= 0; i
< colIdx
.length
; i
++) {
3127 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3128 if (this.attr_("errorBars")) i
+= 1;
3130 this.attrs_
.labels
= labels
;
3131 cols
= labels
.length
;
3134 var outOfOrder
= false;
3135 var annotations
= [];
3136 for (i
= 0; i
< rows
; i
++) {
3138 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3139 data
.getValue(i
, 0) === null) {
3140 this.warn("Ignoring row " + i
+
3141 " of DataTable because of undefined or null first column.");
3145 if (indepType
== 'date' || indepType
== 'datetime') {
3146 row
.push(data
.getValue(i
, 0).getTime());
3148 row
.push(data
.getValue(i
, 0));
3150 if (!this.attr_("errorBars")) {
3151 for (j
= 0; j
< colIdx
.length
; j
++) {
3152 var col
= colIdx
[j
];
3153 row
.push(data
.getValue(i
, col
));
3154 if (hasAnnotations
&&
3155 annotationCols
.hasOwnProperty(col
) &&
3156 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3158 ann
.series
= data
.getColumnLabel(col
);
3160 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3162 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3163 if (k
) ann
.text
+= "\n";
3164 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3166 annotations
.push(ann
);
3170 // Strip out infinities, which give dygraphs problems later on.
3171 for (j
= 0; j
< row
.length
; j
++) {
3172 if (!isFinite(row
[j
])) row
[j
] = null;
3175 for (j
= 0; j
< cols
- 1; j
++) {
3176 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3179 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3186 this.warn("DataTable is out of order; order it correctly to speed loading.");
3187 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3189 this.rawData_
= ret
;
3191 if (annotations
.length
> 0) {
3192 this.setAnnotations(annotations
, true);
3194 this.attributes_
.reparseSeries();
3198 * Get the CSV data. If it's in a function, call that function. If it's in a
3199 * file, do an XMLHttpRequest to get it.
3202 Dygraph
.prototype.start_
= function() {
3203 var data
= this.file_
;
3205 // Functions can return references of all other types.
3206 if (typeof data
== 'function') {
3210 if (Dygraph
.isArrayLike(data
)) {
3211 this.rawData_
= this.parseArray_(data
);
3213 } else if (typeof data
== 'object' &&
3214 typeof data
.getColumnRange
== 'function') {
3215 // must be a DataTable from gviz.
3216 this.parseDataTable_(data
);
3218 } else if (typeof data
== 'string') {
3219 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3220 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3221 if (line_delimiter
) {
3222 this.loadedEvent_(data
);
3224 var req
= new XMLHttpRequest();
3226 req
.onreadystatechange
= function () {
3227 if (req
.readyState
== 4) {
3228 if (req
.status
=== 200 || // Normal http
3229 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3230 caller
.loadedEvent_(req
.responseText
);
3235 req
.open("GET", data
, true);
3239 this.error("Unknown data format: " + (typeof data
));
3244 * Changes various properties of the graph. These can include:
3246 * <li>file: changes the source data for the graph</li>
3247 * <li>errorBars: changes whether the data contains stddev</li>
3250 * There's a huge variety of options that can be passed to this method. For a
3251 * full list, see http://dygraphs.com/options.html.
3253 * @param {Object} attrs The new properties and values
3254 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3255 * call to updateOptions(). If you know better, you can pass true to explicitly
3256 * block the redraw. This can be useful for chaining updateOptions() calls,
3257 * avoiding the occasional infinite loop and preventing redraws when it's not
3258 * necessary (e.g. when updating a callback).
3260 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3261 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3263 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3264 var file
= input_attrs
.file
;
3265 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3267 // TODO(danvk): this is a mess. Move these options into attr_.
3268 if ('rollPeriod' in attrs
) {
3269 this.rollPeriod_
= attrs
.rollPeriod
;
3271 if ('dateWindow' in attrs
) {
3272 this.dateWindow_
= attrs
.dateWindow
;
3273 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3274 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3277 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3278 this.zoomed_y_
= (attrs
.valueRange
!== null);
3281 // TODO(danvk): validate per-series options.
3286 // highlightCircleSize
3288 // Check if this set options will require new points.
3289 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3291 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3293 this.attributes_
.reparseSeries();
3297 if (!block_redraw
) this.start_();
3299 if (!block_redraw
) {
3300 if (requiresNewPoints
) {
3303 this.renderGraph_(false);
3310 * Returns a copy of the options with deprecated names converted into current
3311 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3312 * interested in that, they should save a copy before calling this.
3315 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3317 for (var k
in attrs
) {
3318 if (k
== 'file') continue;
3319 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3322 var set
= function(axis
, opt
, value
) {
3323 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3324 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3325 my_attrs
.axes
[axis
][opt
] = value
;
3327 var map
= function(opt
, axis
, new_opt
) {
3328 if (typeof(attrs
[opt
]) != 'undefined') {
3329 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3330 new_opt
+ " option for the " + axis
+ " axis instead. " +
3331 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3332 "(see http://dygraphs.com/per-axis.html for more information.");
3333 set(axis
, new_opt
, attrs
[opt
]);
3334 delete my_attrs
[opt
];
3338 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3339 map('xValueFormatter', 'x', 'valueFormatter');
3340 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3341 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3342 map('xTicker', 'x', 'ticker');
3343 map('yValueFormatter', 'y', 'valueFormatter');
3344 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3345 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3346 map('yTicker', 'y', 'ticker');
3351 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3352 * containing div (which has presumably changed size since the dygraph was
3353 * instantiated. If the width/height are specified, the div will be resized.
3355 * This is far more efficient than destroying and re-instantiating a
3356 * Dygraph, since it doesn't have to reparse the underlying data.
3358 * @param {Number} [width] Width (in pixels)
3359 * @param {Number} [height] Height (in pixels)
3361 Dygraph
.prototype.resize
= function(width
, height
) {
3362 if (this.resize_lock
) {
3365 this.resize_lock
= true;
3367 if ((width
=== null) != (height
=== null)) {
3368 this.warn("Dygraph.resize() should be called with zero parameters or " +
3369 "two non-NULL parameters. Pretending it was zero.");
3370 width
= height
= null;
3373 var old_width
= this.width_
;
3374 var old_height
= this.height_
;
3377 this.maindiv_
.style
.width
= width
+ "px";
3378 this.maindiv_
.style
.height
= height
+ "px";
3379 this.width_
= width
;
3380 this.height_
= height
;
3382 this.width_
= this.maindiv_
.clientWidth
;
3383 this.height_
= this.maindiv_
.clientHeight
;
3386 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3387 // TODO(danvk): there should be a clear() method.
3388 this.maindiv_
.innerHTML
= "";
3389 this.roller_
= null;
3390 this.attrs_
.labelsDiv
= null;
3391 this.createInterface_();
3392 if (this.annotations_
.length
) {
3393 // createInterface_ reset the layout, so we need to do this.
3394 this.layout_
.setAnnotations(this.annotations_
);
3396 this.createDragInterface_();
3400 this.resize_lock
= false;
3404 * Adjusts the number of points in the rolling average. Updates the graph to
3405 * reflect the new averaging period.
3406 * @param {Number} length Number of points over which to average the data.
3408 Dygraph
.prototype.adjustRoll
= function(length
) {
3409 this.rollPeriod_
= length
;
3414 * Returns a boolean array of visibility statuses.
3416 Dygraph
.prototype.visibility
= function() {
3417 // Do lazy-initialization, so that this happens after we know the number of
3419 if (!this.attr_("visibility")) {
3420 this.attrs_
.visibility
= [];
3422 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3423 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3424 this.attrs_
.visibility
.push(true);
3426 return this.attr_("visibility");
3430 * Changes the visiblity of a series.
3432 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3433 var x
= this.visibility();
3434 if (num
< 0 || num
>= x
.length
) {
3435 this.warn("invalid series number in setVisibility: " + num
);
3443 * How large of an area will the dygraph render itself in?
3444 * This is used for testing.
3445 * @return A {width: w, height: h} object.
3448 Dygraph
.prototype.size
= function() {
3449 return { width
: this.width_
, height
: this.height_
};
3453 * Update the list of annotations and redraw the chart.
3454 * See dygraphs.com/annotations.html for more info on how to use annotations.
3455 * @param ann {Array} An array of annotation objects.
3456 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3458 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3459 // Only add the annotation CSS rule once we know it will be used.
3460 Dygraph
.addAnnotationRule();
3461 this.annotations_
= ann
;
3462 this.layout_
.setAnnotations(this.annotations_
);
3463 if (!suppressDraw
) {
3469 * Return the list of annotations.
3471 Dygraph
.prototype.annotations
= function() {
3472 return this.annotations_
;
3476 * Get the list of label names for this graph. The first column is the
3477 * x-axis, so the data series names start at index 1.
3479 Dygraph
.prototype.getLabels
= function() {
3480 return this.attr_("labels").slice();
3484 * Get the index of a series (column) given its name. The first column is the
3485 * x-axis, so the data series start with index 1.
3487 Dygraph
.prototype.indexFromSetName
= function(name
) {
3488 return this.setIndexByName_
[name
];
3492 * Get the internal dataset index given its name. These are numbered starting from 0,
3493 * and only count visible sets.
3496 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3497 return this.datasetIndex_
[this.indexFromSetName(name
)];
3502 * Adds a default style for the annotation CSS classes to the document. This is
3503 * only executed when annotations are actually used. It is designed to only be
3504 * called once -- all calls after the first will return immediately.
3506 Dygraph
.addAnnotationRule
= function() {
3507 // TODO(danvk): move this function into plugins/annotations.js
?
3508 if (Dygraph
.addedAnnotationCSS
) return;
3510 var rule
= "border: 1px solid black; " +
3511 "background-color: white; " +
3512 "text-align: center;";
3514 var styleSheetElement
= document
.createElement("style");
3515 styleSheetElement
.type
= "text/css";
3516 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3518 // Find the first style sheet that we can access.
3519 // We may not add a rule to a style sheet from another domain for security
3520 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3521 // adds its own style sheets from google.com.
3522 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3523 if (document
.styleSheets
[i
].disabled
) continue;
3524 var mysheet
= document
.styleSheets
[i
];
3526 if (mysheet
.insertRule
) { // Firefox
3527 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3528 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3529 } else if (mysheet
.addRule
) { // IE
3530 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3532 Dygraph
.addedAnnotationCSS
= true;
3535 // Was likely a security exception.
3539 this.warn("Unable to add default annotation CSS rule; display may be off.");
3542 // Older pages may still use this name.
3543 var DateGraph
= Dygraph
;