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 if (!this.resizeHandler_
) {
970 this.resizeHandler_
= function(e
) {
974 // Update when the window is resized.
975 // TODO(danvk): drop frames depending on complexity of the chart.
976 this.addEvent(window
, 'resize', this.resizeHandler_
);
981 * Detach DOM elements in the dygraph and null out all data references.
982 * Calling this when you're done with a dygraph can dramatically reduce memory
983 * usage. See, e.g., the tests/perf.html example.
985 Dygraph
.prototype.destroy
= function() {
986 var removeRecursive
= function(node
) {
987 while (node
.hasChildNodes()) {
988 removeRecursive(node
.firstChild
);
989 node
.removeChild(node
.firstChild
);
993 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
994 var reg
= this.registeredEvents_
[idx
];
995 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
997 this.registeredEvents_
= [];
999 // remove mouse event handlers (This may not be necessary anymore)
1000 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
1001 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
1002 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
1003 removeRecursive(this.maindiv_
);
1005 var nullOut
= function(obj
) {
1006 for (var n
in obj
) {
1007 if (typeof(obj
[n
]) === 'object') {
1012 // remove event handlers
1013 Dygraph
.removeEvent(window
,'resize',this.resizeHandler_
);
1014 this.resizeHandler_
= null;
1015 // These may not all be necessary, but it can't hurt...
1016 nullOut(this.layout_
);
1017 nullOut(this.plotter_
);
1022 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1023 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1024 * or the zoom rectangles) is done on this.canvas_.
1025 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1026 * @return {Object} The newly-created canvas
1029 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1030 var h
= Dygraph
.createCanvas();
1031 h
.style
.position
= "absolute";
1032 // TODO(danvk): h should be offset from canvas. canvas needs to include
1033 // some extra area to make it easier to zoom in on the far left and far
1034 // right. h needs to be precisely the plot area, so that clipping occurs.
1035 h
.style
.top
= canvas
.style
.top
;
1036 h
.style
.left
= canvas
.style
.left
;
1037 h
.width
= this.width_
;
1038 h
.height
= this.height_
;
1039 h
.style
.width
= this.width_
+ "px"; // for IE
1040 h
.style
.height
= this.height_
+ "px"; // for IE
1045 * Creates an overlay element used to handle mouse events.
1046 * @return {Object} The mouse event element.
1049 Dygraph
.prototype.createMouseEventElement_
= function() {
1050 if (this.isUsingExcanvas_
) {
1051 var elem
= document
.createElement("div");
1052 elem
.style
.position
= 'absolute';
1053 elem
.style
.backgroundColor
= 'white';
1054 elem
.style
.filter
= 'alpha(opacity=0)';
1055 elem
.style
.width
= this.width_
+ "px";
1056 elem
.style
.height
= this.height_
+ "px";
1057 this.graphDiv
.appendChild(elem
);
1060 return this.canvas_
;
1065 * Generate a set of distinct colors for the data series. This is done with a
1066 * color wheel. Saturation/Value are customizable, and the hue is
1067 * equally-spaced around the color wheel. If a custom set of colors is
1068 * specified, that is used instead.
1071 Dygraph
.prototype.setColors_
= function() {
1072 var labels
= this.getLabels();
1073 var num
= labels
.length
- 1;
1075 this.colorsMap_
= {};
1076 var colors
= this.attr_('colors');
1079 var sat
= this.attr_('colorSaturation') || 1.0;
1080 var val
= this.attr_('colorValue') || 0.5;
1081 var half
= Math
.ceil(num
/ 2);
1082 for (i
= 1; i
<= num
; i
++) {
1083 if (!this.visibility()[i
-1]) continue;
1084 // alternate colors for high contrast.
1085 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1086 var hue
= (1.0 * idx
/ (1 + num
));
1087 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1088 this.colors_
.push(colorStr
);
1089 this.colorsMap_
[labels
[i
]] = colorStr
;
1092 for (i
= 0; i
< num
; i
++) {
1093 if (!this.visibility()[i
]) continue;
1094 var colorStr
= colors
[i
% colors
.length
];
1095 this.colors_
.push(colorStr
);
1096 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1102 * Return the list of colors. This is either the list of colors passed in the
1103 * attributes or the autogenerated list of rgb(r,g,b) strings.
1104 * This does not return colors for invisible series.
1105 * @return {Array<string>} The list of colors.
1107 Dygraph
.prototype.getColors
= function() {
1108 return this.colors_
;
1112 * Returns a few attributes of a series, i.e. its color, its visibility, which
1113 * axis it's assigned to, and its column in the original data.
1114 * Returns null if the series does not exist.
1115 * Otherwise, returns an object with column, visibility, color and axis properties.
1116 * The "axis" property will be set to 1 for y1 and 2 for y2.
1117 * The "column" property can be fed back into getValue(row, column) to get
1118 * values for this series.
1120 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1122 var labels
= this.getLabels();
1123 for (var i
= 1; i
< labels
.length
; i
++) {
1124 if (labels
[i
] == series_name
) {
1129 if (idx
== -1) return null;
1134 visible
: this.visibility()[idx
- 1],
1135 color
: this.colorsMap_
[series_name
],
1136 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1141 * Create the text box to adjust the averaging period
1144 Dygraph
.prototype.createRollInterface_
= function() {
1145 // Create a roller if one doesn't exist already.
1146 if (!this.roller_
) {
1147 this.roller_
= document
.createElement("input");
1148 this.roller_
.type
= "text";
1149 this.roller_
.style
.display
= "none";
1150 this.graphDiv
.appendChild(this.roller_
);
1153 var display
= this.attr_('showRoller') ? 'block' : 'none';
1155 var area
= this.plotter_
.area
;
1156 var textAttr
= { "position": "absolute",
1158 "top": (area
.y
+ area
.h
- 25) + "px",
1159 "left": (area
.x
+ 1) + "px",
1162 this.roller_
.size
= "2";
1163 this.roller_
.value
= this.rollPeriod_
;
1164 for (var name
in textAttr
) {
1165 if (textAttr
.hasOwnProperty(name
)) {
1166 this.roller_
.style
[name
] = textAttr
[name
];
1171 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1176 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1177 * canvas (i.e. DOM Coords).
1179 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1180 return Dygraph
.pageX(e
) - context
.px
;
1185 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1186 * canvas (i.e. DOM Coords).
1188 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1189 return Dygraph
.pageY(e
) - context
.py
;
1193 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1197 Dygraph
.prototype.createDragInterface_
= function() {
1199 // Tracks whether the mouse is down right now
1201 isPanning
: false, // is this drag part of a pan?
1202 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1203 dragStartX
: null, // pixel coordinates
1204 dragStartY
: null, // pixel coordinates
1205 dragEndX
: null, // pixel coordinates
1206 dragEndY
: null, // pixel coordinates
1207 dragDirection
: null,
1208 prevEndX
: null, // pixel coordinates
1209 prevEndY
: null, // pixel coordinates
1210 prevDragDirection
: null,
1211 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1213 // The value on the left side of the graph when a pan operation starts.
1214 initialLeftmostDate
: null,
1216 // The number of units each pixel spans. (This won't be valid for log
1218 xUnitsPerPixel
: null,
1220 // TODO(danvk): update this comment
1221 // The range in second/value units that the viewport encompasses during a
1222 // panning operation.
1225 // Top-left corner of the canvas, in DOM coords
1226 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1230 // Values for use with panEdgeFraction, which limit how far outside the
1231 // graph's data boundaries it can be panned.
1232 boundedDates
: null, // [minDate, maxDate]
1233 boundedValues
: null, // [[minValue, maxValue] ...]
1235 // We cover iframes during mouse interactions. See comments in
1236 // dygraph-utils.js for more info on why this is a good idea.
1237 tarp
: new Dygraph
.IFrameTarp(),
1239 // contextB is the same thing as this context object but renamed.
1240 initializeMouseDown
: function(event
, g
, contextB
) {
1241 // prevents mouse drags from selecting page text.
1242 if (event
.preventDefault
) {
1243 event
.preventDefault(); // Firefox, Chrome, etc.
1245 event
.returnValue
= false; // IE
1246 event
.cancelBubble
= true;
1249 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1250 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1251 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1252 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1253 contextB
.cancelNextDblclick
= false;
1254 contextB
.tarp
.cover();
1258 var interactionModel
= this.attr_("interactionModel");
1260 // Self is the graph.
1263 // Function that binds the graph and context to the handler.
1264 var bindHandler
= function(handler
) {
1265 return function(event
) {
1266 handler(event
, self
, context
);
1270 for (var eventName
in interactionModel
) {
1271 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1272 this.addEvent(this.mouseEventElement_
, eventName
,
1273 bindHandler(interactionModel
[eventName
]));
1276 // If the user releases the mouse button during a drag, but not over the
1277 // canvas, then it doesn't count as a zooming action.
1278 this.mouseUpHandler_
= function(event
) {
1279 if (context
.isZooming
|| context
.isPanning
) {
1280 context
.isZooming
= false;
1281 context
.dragStartX
= null;
1282 context
.dragStartY
= null;
1285 if (context
.isPanning
) {
1286 context
.isPanning
= false;
1287 context
.draggingDate
= null;
1288 context
.dateRange
= null;
1289 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1290 delete self
.axes_
[i
].draggingValue
;
1291 delete self
.axes_
[i
].dragValueRange
;
1295 context
.tarp
.uncover();
1298 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1302 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1303 * up any previous zoom rectangles that were drawn. This could be optimized to
1304 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1307 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1308 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1309 * @param {Number} startX The X position where the drag started, in canvas
1311 * @param {Number} endX The current X position of the drag, in canvas coords.
1312 * @param {Number} startY The Y position where the drag started, in canvas
1314 * @param {Number} endY The current Y position of the drag, in canvas coords.
1315 * @param {Number} prevDirection the value of direction on the previous call to
1316 * this function. Used to avoid excess redrawing
1317 * @param {Number} prevEndX The value of endX on the previous call to this
1318 * function. Used to avoid excess redrawing
1319 * @param {Number} prevEndY The value of endY on the previous call to this
1320 * function. Used to avoid excess redrawing
1323 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1324 endY
, prevDirection
, prevEndX
,
1326 var ctx
= this.canvas_ctx_
;
1328 // Clean up from the previous rect if necessary
1329 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1330 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1331 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1332 } else if (prevDirection
== Dygraph
.VERTICAL
){
1333 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1334 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1337 // Draw a light-grey rectangle to show the new viewing area
1338 if (direction
== Dygraph
.HORIZONTAL
) {
1339 if (endX
&& startX
) {
1340 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1341 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1342 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1344 } else if (direction
== Dygraph
.VERTICAL
) {
1345 if (endY
&& startY
) {
1346 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1347 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1348 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1352 if (this.isUsingExcanvas_
) {
1353 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1358 * Clear the zoom rectangle (and perform no zoom).
1361 Dygraph
.prototype.clearZoomRect_
= function() {
1362 this.currentZoomRectArgs_
= null;
1363 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1367 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1368 * the canvas. The exact zoom window may be slightly larger if there are no data
1369 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1370 * which accepts dates that match the raw data. This function redraws the graph.
1372 * @param {Number} lowX The leftmost pixel value that should be visible.
1373 * @param {Number} highX The rightmost pixel value that should be visible.
1376 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1377 this.currentZoomRectArgs_
= null;
1378 // Find the earliest and latest dates contained in this canvasx range.
1379 // Convert the call to date ranges of the raw data.
1380 var minDate
= this.toDataXCoord(lowX
);
1381 var maxDate
= this.toDataXCoord(highX
);
1382 this.doZoomXDates_(minDate
, maxDate
);
1386 * Transition function to use in animations. Returns values between 0.0
1387 * (totally old values) and 1.0 (totally new values) for each frame.
1390 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1392 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1396 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1397 * method with doZoomX which accepts pixel coordinates. This function redraws
1400 * @param {Number} minDate The minimum date that should be visible.
1401 * @param {Number} maxDate The maximum date that should be visible.
1404 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1405 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1406 // can produce strange effects. Rather than the y-axis transitioning slowly
1407 // between values, it can jerk around.)
1408 var old_window
= this.xAxisRange();
1409 var new_window
= [minDate
, maxDate
];
1410 this.zoomed_x_
= true;
1412 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1413 if (that
.attr_("zoomCallback")) {
1414 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1420 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1421 * the canvas. This function redraws the graph.
1423 * @param {Number} lowY The topmost pixel value that should be visible.
1424 * @param {Number} highY The lowest pixel value that should be visible.
1427 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1428 this.currentZoomRectArgs_
= null;
1429 // Find the highest and lowest values in pixel range for each axis.
1430 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1431 // This is because pixels increase as you go down on the screen, whereas data
1432 // coordinates increase as you go up the screen.
1433 var oldValueRanges
= this.yAxisRanges();
1434 var newValueRanges
= [];
1435 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1436 var hi
= this.toDataYCoord(lowY
, i
);
1437 var low
= this.toDataYCoord(highY
, i
);
1438 newValueRanges
.push([low
, hi
]);
1441 this.zoomed_y_
= true;
1443 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1444 if (that
.attr_("zoomCallback")) {
1445 var xRange
= that
.xAxisRange();
1446 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1452 * Reset the zoom to the original view coordinates. This is the same as
1453 * double-clicking on the graph.
1455 Dygraph
.prototype.resetZoom
= function() {
1456 var dirty
= false, dirtyX
= false, dirtyY
= false;
1457 if (this.dateWindow_
!== null) {
1462 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1463 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1469 // Clear any selection, since it's likely to be drawn in the wrong place.
1470 this.clearSelection();
1473 this.zoomed_x_
= false;
1474 this.zoomed_y_
= false;
1476 var minDate
= this.rawData_
[0][0];
1477 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1479 // With only one frame, don't bother calculating extreme ranges.
1480 // TODO(danvk): merge this block w/ the code below
.
1481 if (!this.attr_("animatedZooms")) {
1482 this.dateWindow_
= null;
1483 for (i
= 0; i
< this.axes_
.length
; i
++) {
1484 if (this.axes_
[i
].valueWindow
!== null) {
1485 delete this.axes_
[i
].valueWindow
;
1489 if (this.attr_("zoomCallback")) {
1490 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1495 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1497 oldWindow
= this.xAxisRange();
1498 newWindow
= [minDate
, maxDate
];
1502 oldValueRanges
= this.yAxisRanges();
1503 // TODO(danvk): this is pretty inefficient
1504 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1505 var extremes
= packed
[1];
1507 // this has the side-effect of modifying this.axes_.
1508 // this doesn't make much sense in this context, but it's convenient (we
1509 // need this.axes_[*].extremeValues) and not harmful since we'll be
1510 // calling drawGraph_ shortly, which clobbers these values.
1511 this.computeYAxisRanges_(extremes
);
1513 newValueRanges
= [];
1514 for (i
= 0; i
< this.axes_
.length
; i
++) {
1515 var axis
= this.axes_
[i
];
1516 newValueRanges
.push((axis
.valueRange
!== null &&
1517 axis
.valueRange
!== undefined
) ?
1518 axis
.valueRange
: axis
.extremeRange
);
1523 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1525 that
.dateWindow_
= null;
1526 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1527 if (that
.axes_
[i
].valueWindow
!== null) {
1528 delete that
.axes_
[i
].valueWindow
;
1531 if (that
.attr_("zoomCallback")) {
1532 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1539 * Combined animation logic for all zoom functions.
1540 * either the x parameters or y parameters may be null.
1543 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1544 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1547 var valueRanges
= [];
1550 if (oldXRange
!== null && newXRange
!== null) {
1551 for (step
= 1; step
<= steps
; step
++) {
1552 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1553 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1554 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1558 if (oldYRanges
!== null && newYRanges
!== null) {
1559 for (step
= 1; step
<= steps
; step
++) {
1560 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1562 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1563 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1564 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1566 valueRanges
[step
-1] = thisRange
;
1571 Dygraph
.repeatAndCleanup(function(step
) {
1572 if (valueRanges
.length
) {
1573 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1574 var w
= valueRanges
[step
][i
];
1575 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1578 if (windows
.length
) {
1579 that
.dateWindow_
= windows
[step
];
1582 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1586 * Get the current graph's area object.
1588 * Returns: {x, y, w, h}
1590 Dygraph
.prototype.getArea
= function() {
1591 return this.plotter_
.area
;
1595 * Convert a mouse event to DOM coordinates relative to the graph origin.
1597 * Returns a two-element array: [X, Y].
1599 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1600 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1601 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1602 return [canvasx
, canvasy
];
1606 * Given a canvas X coordinate, find the closest row.
1607 * @param {Number} domX graph-relative DOM X coordinate
1608 * Returns: row number, integer
1611 Dygraph
.prototype.findClosestRow
= function(domX
) {
1612 var minDistX
= Infinity
;
1613 var pointIdx
= -1, setIdx
= -1;
1614 var sets
= this.layout_
.points
;
1615 for (var i
= 0; i
< sets
.length
; i
++) {
1616 var points
= sets
[i
];
1617 var len
= points
.length
;
1618 for (var j
= 0; j
< len
; j
++) {
1619 var point
= points
[j
];
1620 if (!Dygraph
.isValidPoint(point
, true)) continue;
1621 var dist
= Math
.abs(point
.canvasx
- domX
);
1622 if (dist
< minDistX
) {
1630 // TODO(danvk): remove this function; it's trivial and has only one use.
1631 return this.idxToRow_(setIdx
, pointIdx
);
1635 * Given canvas X,Y coordinates, find the closest point.
1637 * This finds the individual data point across all visible series
1638 * that's closest to the supplied DOM coordinates using the standard
1639 * Euclidean X,Y distance.
1641 * @param {Number} domX graph-relative DOM X coordinate
1642 * @param {Number} domY graph-relative DOM Y coordinate
1643 * Returns: {row, seriesName, point}
1646 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1647 var minDist
= Infinity
;
1649 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1650 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1651 var points
= this.layout_
.points
[setIdx
];
1652 for (var i
= 0; i
< points
.length
; ++i
) {
1653 var point
= points
[i
];
1654 if (!Dygraph
.isValidPoint(point
)) continue;
1655 dx
= point
.canvasx
- domX
;
1656 dy
= point
.canvasy
- domY
;
1657 dist
= dx
* dx
+ dy
* dy
;
1658 if (dist
< minDist
) {
1660 closestPoint
= point
;
1661 closestSeries
= setIdx
;
1666 var name
= this.layout_
.setNames
[closestSeries
];
1668 row
: idx
+ this.getLeftBoundary_(),
1675 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1677 * This first finds the X data point closest to the supplied DOM X coordinate,
1678 * then finds the series which puts the Y coordinate on top of its filled area,
1679 * using linear interpolation between adjacent point pairs.
1681 * @param {Number} domX graph-relative DOM X coordinate
1682 * @param {Number} domY graph-relative DOM Y coordinate
1683 * Returns: {row, seriesName, point}
1686 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1687 var row
= this.findClosestRow(domX
);
1688 var boundary
= this.getLeftBoundary_();
1689 var rowIdx
= row
- boundary
;
1690 var closestPoint
, closestSeries
;
1691 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1692 var points
= this.layout_
.points
[setIdx
];
1693 if (rowIdx
>= points
.length
) continue;
1694 var p1
= points
[rowIdx
];
1695 if (!Dygraph
.isValidPoint(p1
)) continue;
1696 var py
= p1
.canvasy
;
1697 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1698 // interpolate series Y value using next point
1699 var p2
= points
[rowIdx
+ 1];
1700 if (Dygraph
.isValidPoint(p2
)) {
1701 var dx
= p2
.canvasx
- p1
.canvasx
;
1703 var r
= (domX
- p1
.canvasx
) / dx
;
1704 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1707 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1708 // interpolate series Y value using previous point
1709 var p0
= points
[rowIdx
- 1];
1710 if (Dygraph
.isValidPoint(p0
)) {
1711 var dx
= p1
.canvasx
- p0
.canvasx
;
1713 var r
= (p1
.canvasx
- domX
) / dx
;
1714 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1718 // Stop if the point (domX, py) is above this series' upper edge
1719 if (setIdx
=== 0 || py
< domY
) {
1721 closestSeries
= setIdx
;
1724 var name
= this.layout_
.setNames
[closestSeries
];
1733 * When the mouse moves in the canvas, display information about a nearby data
1734 * point and draw dots over those points in the data series. This function
1735 * takes care of cleanup of previously-drawn dots.
1736 * @param {Object} event The mousemove event from the browser.
1739 Dygraph
.prototype.mouseMove_
= function(event
) {
1740 // This prevents JS errors when mousing over the canvas before data loads.
1741 var points
= this.layout_
.points
;
1742 if (points
=== undefined
|| points
=== null) return;
1744 var canvasCoords
= this.eventToDomCoords(event
);
1745 var canvasx
= canvasCoords
[0];
1746 var canvasy
= canvasCoords
[1];
1748 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1749 var selectionChanged
= false;
1750 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1752 if (this.attr_("stackedGraph")) {
1753 closest
= this.findStackedPoint(canvasx
, canvasy
);
1755 closest
= this.findClosestPoint(canvasx
, canvasy
);
1757 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1759 var idx
= this.findClosestRow(canvasx
);
1760 selectionChanged
= this.setSelection(idx
);
1763 var callback
= this.attr_("highlightCallback");
1764 if (callback
&& selectionChanged
) {
1765 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1770 * Fetch left offset from first defined boundaryIds record (see bug #236).
1773 Dygraph
.prototype.getLeftBoundary_
= function() {
1774 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1775 if (this.boundaryIds_
[i
] !== undefined
) {
1776 return this.boundaryIds_
[i
][0];
1783 * Transforms layout_.points index into data row number.
1784 * @param int layout_.points index
1785 * @return int row number, or -1 if none could be found.
1788 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1789 if (rowIdx
< 0) return -1;
1791 var boundary
= this.getLeftBoundary_();
1792 return boundary
+ rowIdx
;
1793 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1794 // var set = this.layout_.datasets[setIdx];
1795 // if (idx < set.length) {
1796 // return boundary + idx;
1798 // idx -= set.length;
1803 Dygraph
.prototype.animateSelection_
= function(direction
) {
1804 var totalSteps
= 10;
1806 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1807 if (this.animateId
=== undefined
) this.animateId
= 0;
1808 var start
= this.fadeLevel
;
1809 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1811 if (this.fadeLevel
) {
1812 this.updateSelection_(1.0);
1817 var thisId
= ++this.animateId
;
1819 Dygraph
.repeatAndCleanup(
1821 // ignore simultaneous animations
1822 if (that
.animateId
!= thisId
) return;
1824 that
.fadeLevel
+= direction
;
1825 if (that
.fadeLevel
=== 0) {
1826 that
.clearSelection();
1828 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1831 steps
, millis
, function() {});
1835 * Draw dots over the selectied points in the data series. This function
1836 * takes care of cleanup of previously-drawn dots.
1839 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1840 /*var defaultPrevented = */
1841 this.cascadeEvents_('select', {
1842 selectedX
: this.lastx_
,
1843 selectedPoints
: this.selPoints_
1845 // TODO(danvk): use defaultPrevented here?
1847 // Clear the previously drawn vertical, if there is one
1849 var ctx
= this.canvas_ctx_
;
1850 if (this.attr_('highlightSeriesOpts')) {
1851 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1852 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1854 // Activating background fade includes an animation effect for a gradual
1855 // fade. TODO(klausw): make this independently configurable if it causes
1856 // issues? Use a shared preference to control animations?
1857 var animateBackgroundFade
= true;
1858 if (animateBackgroundFade
) {
1859 if (opt_animFraction
=== undefined
) {
1860 // start a new animation
1861 this.animateSelection_(1);
1864 alpha
*= opt_animFraction
;
1866 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1867 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1870 // Redraw only the highlighted series in the interactive canvas (not the
1871 // static plot canvas, which is where series are usually drawn).
1872 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1873 } else if (this.previousVerticalX_
>= 0) {
1874 // Determine the maximum highlight circle size.
1875 var maxCircleSize
= 0;
1876 var labels
= this.attr_('labels');
1877 for (i
= 1; i
< labels
.length
; i
++) {
1878 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1879 if (r
> maxCircleSize
) maxCircleSize
= r
;
1881 var px
= this.previousVerticalX_
;
1882 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1883 2 * maxCircleSize
+ 2, this.height_
);
1886 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1887 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1890 if (this.selPoints_
.length
> 0) {
1891 // Draw colored circles over the center of each selected point
1892 var canvasx
= this.selPoints_
[0].canvasx
;
1894 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1895 var pt
= this.selPoints_
[i
];
1896 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1898 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1899 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1900 var color
= this.plotter_
.colors
[pt
.name
];
1902 callback
= Dygraph
.Circles
.DEFAULT
;
1904 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1905 ctx
.strokeStyle
= color
;
1906 ctx
.fillStyle
= color
;
1907 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1912 this.previousVerticalX_
= canvasx
;
1917 * Manually set the selected points and display information about them in the
1918 * legend. The selection can be cleared using clearSelection() and queried
1919 * using getSelection().
1920 * @param { Integer } row number that should be highlighted (i.e. appear with
1921 * hover dots on the chart). Set to false to clear any selection.
1922 * @param { seriesName } optional series name to highlight that series with the
1923 * the highlightSeriesOpts setting.
1924 * @param { locked } optional If true, keep seriesName selected when mousing
1925 * over the graph, disabling closest-series highlighting. Call clearSelection()
1928 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1929 // Extract the points we've selected
1930 this.selPoints_
= [];
1932 if (row
!== false) {
1933 row
-= this.getLeftBoundary_();
1936 var changed
= false;
1937 if (row
!== false && row
>= 0) {
1938 if (row
!= this.lastRow_
) changed
= true;
1939 this.lastRow_
= row
;
1940 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1941 var set
= this.layout_
.datasets
[setIdx
];
1942 if (row
< set
.length
) {
1943 var point
= this.layout_
.points
[setIdx
][row
];
1945 if (this.attr_("stackedGraph")) {
1946 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1949 if (point
.yval
!== null) this.selPoints_
.push(point
);
1953 if (this.lastRow_
>= 0) changed
= true;
1957 if (this.selPoints_
.length
) {
1958 this.lastx_
= this.selPoints_
[0].xval
;
1963 if (opt_seriesName
!== undefined
) {
1964 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1965 this.highlightSet_
= opt_seriesName
;
1968 if (opt_locked
!== undefined
) {
1969 this.lockedSet_
= opt_locked
;
1973 this.updateSelection_(undefined
);
1979 * The mouse has left the canvas. Clear out whatever artifacts remain
1980 * @param {Object} event the mouseout event from the browser.
1983 Dygraph
.prototype.mouseOut_
= function(event
) {
1984 if (this.attr_("unhighlightCallback")) {
1985 this.attr_("unhighlightCallback")(event
);
1988 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
1989 this.clearSelection();
1994 * Clears the current selection (i.e. points that were highlighted by moving
1995 * the mouse over the chart).
1997 Dygraph
.prototype.clearSelection
= function() {
1998 this.cascadeEvents_('deselect', {});
2000 this.lockedSet_
= false;
2001 // Get rid of the overlay data
2002 if (this.fadeLevel
) {
2003 this.animateSelection_(-1);
2006 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2008 this.selPoints_
= [];
2011 this.highlightSet_
= null;
2015 * Returns the number of the currently selected row. To get data for this row,
2016 * you can use the getValue method.
2017 * @return { Integer } row number, or -1 if nothing is selected
2019 Dygraph
.prototype.getSelection
= function() {
2020 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2024 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2025 var points
= this.layout_
.points
[setIdx
];
2026 for (var row
= 0; row
< points
.length
; row
++) {
2027 if (points
[row
].x
== this.selPoints_
[0].x
) {
2028 return row
+ this.getLeftBoundary_();
2036 * Returns the name of the currently-highlighted series.
2037 * Only available when the highlightSeriesOpts option is in use.
2039 Dygraph
.prototype.getHighlightSeries
= function() {
2040 return this.highlightSet_
;
2044 * Returns true if the currently-highlighted series was locked
2045 * via setSelection(..., seriesName, true).
2047 Dygraph
.prototype.isSeriesLocked
= function() {
2048 return this.lockedSet_
;
2052 * Fires when there's data available to be graphed.
2053 * @param {String} data Raw CSV data to be plotted
2056 Dygraph
.prototype.loadedEvent_
= function(data
) {
2057 this.rawData_
= this.parseCSV_(data
);
2062 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2065 Dygraph
.prototype.addXTicks_
= function() {
2066 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2068 if (this.dateWindow_
) {
2069 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2071 range
= this.fullXRange_();
2074 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2075 var xTicks
= xAxisOptionsView('ticker')(
2078 this.width_
, // TODO(danvk): should be area.width
2081 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2082 // console.log(msg);
2083 this.layout_
.setXTicks(xTicks
);
2088 * Computes the range of the data series (including confidence intervals).
2089 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2090 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2091 * @return [low, high]
2093 Dygraph
.prototype.extremeValues_
= function(series
) {
2094 var minY
= null, maxY
= null, j
, y
;
2096 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2098 // With custom bars, maxY is the max of the high values.
2099 for (j
= 0; j
< series
.length
; j
++) {
2100 y
= series
[j
][1][0];
2101 if (y
=== null || isNaN(y
)) continue;
2102 var low
= y
- series
[j
][1][1];
2103 var high
= y
+ series
[j
][1][2];
2104 if (low
> y
) low
= y
; // this can happen with custom bars,
2105 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2106 if (maxY
=== null || high
> maxY
) {
2109 if (minY
=== null || low
< minY
) {
2114 for (j
= 0; j
< series
.length
; j
++) {
2116 if (y
=== null || isNaN(y
)) continue;
2117 if (maxY
=== null || y
> maxY
) {
2120 if (minY
=== null || y
< minY
) {
2126 return [minY
, maxY
];
2131 * This function is called once when the chart's data is changed or the options
2132 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2133 * idea is that values derived from the chart's data can be computed here,
2134 * rather than every time the chart is drawn. This includes things like the
2135 * number of axes, rolling averages, etc.
2137 Dygraph
.prototype.predraw_
= function() {
2138 var start
= new Date();
2140 this.layout_
.computePlotArea();
2142 // TODO(danvk): move more computations out of drawGraph_ and into here.
2143 this.computeYAxes_();
2145 // Create a new plotter.
2146 if (this.plotter_
) {
2147 this.cascadeEvents_('clearChart');
2148 this.plotter_
.clear();
2150 this.plotter_
= new DygraphCanvasRenderer(this,
2155 // The roller sits in the bottom left corner of the chart. We don't know where
2156 // this will be until the options are available, so it's positioned here.
2157 this.createRollInterface_();
2159 this.cascadeEvents_('predraw');
2161 // Convert the raw data (a 2D array) into the internal format and compute
2162 // rolling averages.
2163 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2164 for (var i
= 1; i
< this.numColumns(); i
++) {
2165 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2166 var logScale
= this.attr_('logscale');
2167 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2168 series
= this.rollingAverage(series
, this.rollPeriod_
);
2169 this.rolledSeries_
.push(series
);
2172 // If the data or options have changed, then we'd better redraw.
2175 // This is used to determine whether to do various animations.
2176 var end
= new Date();
2177 this.drawingTimeMs_
= (end
- start
);
2181 * Loop over all fields and create datasets, calculating extreme y-values for
2182 * each series and extreme x-indices as we go.
2184 * dateWindow is passed in as an explicit parameter so that we can compute
2185 * extreme values "speculatively", i.e. without actually setting state on the
2188 * TODO(danvk): make this more of a true function
2189 * @return [ datasets, seriesExtremes, boundaryIds ]
2192 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2193 var boundaryIds
= [];
2194 var cumulative_y
= []; // For stacked series.
2196 var extremes
= {}; // series name -> [low, high]
2199 // Loop over the fields (series). Go from the last to the first,
2200 // because if they're stacked that's how we accumulate the values.
2201 var num_series
= rolledSeries
.length
- 1;
2202 for (i
= num_series
; i
>= 1; i
--) {
2203 if (!this.visibility()[i
- 1]) continue;
2205 // Note: this copy _is_ necessary at the moment.
2206 // If you remove it, it breaks zooming with error bars on.
2207 // TODO(danvk): investigate further & write a test for this.
2209 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2210 series
.push(rolledSeries
[i
][j
]);
2213 // Prune down to the desired range, if necessary (for zooming)
2214 // Because there can be lines going to points outside of the visible area,
2215 // we actually prune to visible points, plus one on either side.
2216 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2218 var low
= dateWindow
[0];
2219 var high
= dateWindow
[1];
2221 // TODO(danvk): do binary search instead of linear search.
2222 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2223 var firstIdx
= null, lastIdx
= null;
2224 for (k
= 0; k
< series
.length
; k
++) {
2225 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2228 if (series
[k
][0] <= high
) {
2232 if (firstIdx
=== null) firstIdx
= 0;
2233 if (firstIdx
> 0) firstIdx
--;
2234 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2235 if (lastIdx
< series
.length
- 1) lastIdx
++;
2236 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2237 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2238 pruned
.push(series
[k
]);
2242 boundaryIds
[i
-1] = [0, series
.length
-1];
2245 var seriesExtremes
= this.extremeValues_(series
);
2248 for (j
=0; j
<series
.length
; j
++) {
2249 series
[j
] = [series
[j
][0],
2254 } else if (this.attr_("stackedGraph")) {
2255 var l
= series
.length
;
2257 for (j
= 0; j
< l
; j
++) {
2258 // If one data set has a NaN, let all subsequent stacked
2259 // sets inherit the NaN -- only start at 0 for the first set.
2260 var x
= series
[j
][0];
2261 if (cumulative_y
[x
] === undefined
) {
2262 cumulative_y
[x
] = 0;
2265 actual_y
= series
[j
][1];
2266 if (actual_y
=== null) {
2267 series
[j
] = [x
, null];
2271 cumulative_y
[x
] += actual_y
;
2273 series
[j
] = [x
, cumulative_y
[x
]];
2275 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2276 seriesExtremes
[1] = cumulative_y
[x
];
2278 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2279 seriesExtremes
[0] = cumulative_y
[x
];
2284 var seriesName
= this.attr_("labels")[i
];
2285 extremes
[seriesName
] = seriesExtremes
;
2286 datasets
[i
] = series
;
2289 // For stacked graphs, a NaN value for any point in the sum should create a
2290 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2291 if (this.attr_("stackedGraph")) {
2292 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2293 // Use the first nonempty dataset to get X values.
2294 if (!datasets
[k
]) continue;
2295 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2296 var x
= datasets
[k
][j
][0];
2297 if (isNaN(cumulative_y
[x
])) {
2298 // Set all Y values to NaN at that X value.
2299 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2300 if (!datasets
[i
]) continue;
2301 datasets
[i
][j
][1] = NaN
;
2309 return [ datasets
, extremes
, boundaryIds
];
2313 * Update the graph with new data. This method is called when the viewing area
2314 * has changed. If the underlying data or options have changed, predraw_ will
2315 * be called before drawGraph_ is called.
2319 Dygraph
.prototype.drawGraph_
= function() {
2320 var start
= new Date();
2322 // This is used to set the second parameter to drawCallback, below.
2323 var is_initial_draw
= this.is_initial_draw_
;
2324 this.is_initial_draw_
= false;
2326 this.layout_
.removeAllDatasets();
2328 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2330 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2331 var datasets
= packed
[0];
2332 var extremes
= packed
[1];
2333 this.boundaryIds_
= packed
[2];
2335 this.setIndexByName_
= {};
2336 var labels
= this.attr_("labels");
2337 if (labels
.length
> 0) {
2338 this.setIndexByName_
[labels
[0]] = 0;
2341 for (var i
= 1; i
< datasets
.length
; i
++) {
2342 this.setIndexByName_
[labels
[i
]] = i
;
2343 if (!this.visibility()[i
- 1]) continue;
2344 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2345 this.datasetIndex_
[i
] = dataIdx
++;
2348 this.computeYAxisRanges_(extremes
);
2349 this.layout_
.setYAxes(this.axes_
);
2353 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2354 var tmp_zoomed_x
= this.zoomed_x_
;
2355 // Tell PlotKit to use this new data and render itself
2356 this.layout_
.setDateWindow(this.dateWindow_
);
2357 this.zoomed_x_
= tmp_zoomed_x
;
2358 this.layout_
.evaluateWithError();
2359 this.renderGraph_(is_initial_draw
);
2361 if (this.attr_("timingName")) {
2362 var end
= new Date();
2364 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2370 * This does the work of drawing the chart. It assumes that the layout and axis
2371 * scales have already been set (e.g. by predraw_).
2375 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2376 this.cascadeEvents_('clearChart');
2377 this.plotter_
.clear();
2379 if (this.attr_('underlayCallback')) {
2380 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2381 // users who expect a deprecated form of this callback.
2382 this.attr_('underlayCallback')(
2383 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2387 canvas
: this.hidden_
,
2388 drawingContext
: this.hidden_ctx_
2390 this.cascadeEvents_('willDrawChart', e
);
2391 this.plotter_
.render();
2392 this.cascadeEvents_('didDrawChart', e
);
2394 // TODO(danvk): is this a performance bottleneck when panning?
2395 // The interaction canvas should already be empty in that situation.
2396 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2397 this.canvas_
.height
);
2399 if (this.attr_("drawCallback") !== null) {
2400 this.attr_("drawCallback")(this, is_initial_draw
);
2406 * Determine properties of the y-axes which are independent of the data
2407 * currently being displayed. This includes things like the number of axes and
2408 * the style of the axes. It does not include the range of each axis and its
2410 * This fills in this.axes_.
2411 * axes_ = [ { options } ]
2412 * indices are into the axes_ array.
2414 Dygraph
.prototype.computeYAxes_
= function() {
2415 // Preserve valueWindow settings if they exist, and if the user hasn't
2416 // specified a new valueRange.
2417 var valueWindows
, axis
, index
, opts
, v
;
2418 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2420 for (index
= 0; index
< this.axes_
.length
; index
++) {
2421 valueWindows
.push(this.axes_
[index
].valueWindow
);
2425 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2426 // data computation as well as options storage.
2427 // Go through once and add all the axes.
2430 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2431 // Add a new axis, making a copy of its per-axis options.
2432 opts
= { g
: this };
2433 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2434 this.axes_
[axis
] = opts
;
2438 // Copy global valueRange option over to the first axis.
2439 // NOTE(konigsberg): Are these two statements necessary?
2440 // I tried removing it. The automated tests pass, and manually
2441 // messing with tests/zoom
.html showed no trouble
.
2442 v
= this.attr_('valueRange');
2443 if (v
) this.axes_
[0].valueRange
= v
;
2445 if (valueWindows
!== undefined
) {
2446 // Restore valueWindow settings.
2447 for (index
= 0; index
< valueWindows
.length
; index
++) {
2448 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2452 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2454 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2455 v
= opts("valueRange");
2456 if (v
) this.axes_
[axis
].valueRange
= v
;
2457 } else { // To keep old behavior
2458 var axes
= this.user_attrs_
.axes
;
2459 if (axes
&& axes
.y2
) {
2460 v
= axes
.y2
.valueRange
;
2461 if (v
) this.axes_
[axis
].valueRange
= v
;
2468 * Returns the number of y-axes on the chart.
2469 * @return {Number} the number of axes.
2471 Dygraph
.prototype.numAxes
= function() {
2472 return this.attributes_
.numAxes();
2477 * Returns axis properties for the given series.
2478 * @param { String } setName The name of the series for which to get axis
2479 * properties, e.g. 'Y1'.
2480 * @return { Object } The axis properties.
2482 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2483 // TODO(danvk): handle errors.
2484 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2489 * Determine the value range and tick marks for each axis.
2490 * @param {Object} extremes A mapping from seriesName -> [low, high]
2491 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2493 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2495 var numAxes
= this.attributes_
.numAxes();
2497 // Compute extreme values, a span and tick marks for each axis.
2498 for (var i
= 0; i
< numAxes
; i
++) {
2499 var axis
= this.axes_
[i
];
2500 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2501 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2502 series
= this.attributes_
.seriesForAxis(i
);
2504 if (series
.length
=== 0) {
2505 // If no series are defined or visible then use a reasonable default
2506 axis
.extremeRange
= [0, 1];
2508 // Calculate the extremes of extremes.
2509 var minY
= Infinity
; // extremes[series[0]][0];
2510 var maxY
= -Infinity
; // extremes[series[0]][1];
2511 var extremeMinY
, extremeMaxY
;
2513 for (var j
= 0; j
< series
.length
; j
++) {
2514 // this skips invisible series
2515 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2517 // Only use valid extremes to stop null data series' from corrupting the scale.
2518 extremeMinY
= extremes
[series
[j
]][0];
2519 if (extremeMinY
!== null) {
2520 minY
= Math
.min(extremeMinY
, minY
);
2522 extremeMaxY
= extremes
[series
[j
]][1];
2523 if (extremeMaxY
!== null) {
2524 maxY
= Math
.max(extremeMaxY
, maxY
);
2527 if (includeZero
&& minY
> 0) minY
= 0;
2529 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2530 if (minY
== Infinity
) minY
= 0;
2531 if (maxY
== -Infinity
) maxY
= 1;
2533 // Add some padding and round up to an integer to be human-friendly.
2534 var span
= maxY
- minY
;
2535 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2536 if (span
=== 0) { span
= maxY
; }
2538 var maxAxisY
, minAxisY
;
2540 maxAxisY
= maxY
+ 0.1 * span
;
2543 maxAxisY
= maxY
+ 0.1 * span
;
2544 minAxisY
= minY
- 0.1 * span
;
2546 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2547 if (!this.attr_("avoidMinZero")) {
2548 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2549 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2552 if (this.attr_("includeZero")) {
2553 if (maxY
< 0) maxAxisY
= 0;
2554 if (minY
> 0) minAxisY
= 0;
2557 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2559 if (axis
.valueWindow
) {
2560 // This is only set if the user has zoomed on the y-axis. It is never set
2561 // by a user. It takes precedence over axis.valueRange because, if you set
2562 // valueRange, you'd still expect to be able to pan.
2563 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2564 } else if (axis
.valueRange
) {
2565 // This is a user-set value range for this axis.
2566 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2568 axis
.computedValueRange
= axis
.extremeRange
;
2571 // Add ticks. By default, all axes inherit the tick positions of the
2572 // primary axis. However, if an axis is specifically marked as having
2573 // independent ticks, then that is permissible as well.
2574 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2575 var ticker
= opts('ticker');
2576 if (i
=== 0 || axis
.independentTicks
) {
2577 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2578 axis
.computedValueRange
[1],
2579 this.height_
, // TODO(danvk): should be area.height
2583 var p_axis
= this.axes_
[0];
2584 var p_ticks
= p_axis
.ticks
;
2585 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2586 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2587 var tick_values
= [];
2588 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2589 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2590 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2591 tick_values
.push(y_val
);
2594 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2595 axis
.computedValueRange
[1],
2596 this.height_
, // TODO(danvk): should be area.height
2605 * Extracts one series from the raw data (a 2D array) into an array of (date,
2608 * This is where undesirable points (i.e. negative values on log scales and
2609 * missing values through which we wish to connect lines) are dropped.
2610 * TODO(danvk): the "missing values" bit above doesn't seem right.
2614 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2615 // TODO(danvk): pre-allocate series here.
2617 for (var j
= 0; j
< rawData
.length
; j
++) {
2618 var x
= rawData
[j
][0];
2619 var point
= rawData
[j
][i
];
2621 // On the log scale, points less than zero do not exist.
2622 // This will create a gap in the chart.
2627 series
.push([x
, point
]);
2634 * Calculates the rolling average of a data set.
2635 * If originalData is [label, val], rolls the average of those.
2636 * If originalData is [label, [, it's interpreted as [value, stddev]
2637 * and the roll is returned in the same form, with appropriately reduced
2638 * stddev for each value.
2639 * Note that this is where fractional input (i.e. '5/10') is converted into
2641 * @param {Array} originalData The data in the appropriate format (see above)
2642 * @param {Number} rollPeriod The number of points over which to average the
2645 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2646 if (originalData
.length
< 2)
2647 return originalData
;
2648 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2649 var rollingData
= [];
2650 var sigma
= this.attr_("sigma");
2652 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2653 if (this.fractions_
) {
2655 var den
= 0; // numerator/denominator
2657 for (i
= 0; i
< originalData
.length
; i
++) {
2658 num
+= originalData
[i
][1][0];
2659 den
+= originalData
[i
][1][1];
2660 if (i
- rollPeriod
>= 0) {
2661 num
-= originalData
[i
- rollPeriod
][1][0];
2662 den
-= originalData
[i
- rollPeriod
][1][1];
2665 var date
= originalData
[i
][0];
2666 var value
= den
? num
/ den
: 0.0;
2667 if (this.attr_("errorBars")) {
2668 if (this.attr_("wilsonInterval")) {
2669 // For more details on this confidence interval, see:
2670 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2672 var p
= value
< 0 ? 0 : value
, n
= den
;
2673 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2674 var denom
= 1 + sigma
* sigma
/ den
;
2675 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2676 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2677 rollingData
[i
] = [date
,
2678 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2680 rollingData
[i
] = [date
, [0, 0, 0]];
2683 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2684 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2687 rollingData
[i
] = [date
, mult
* value
];
2690 } else if (this.attr_("customBars")) {
2695 for (i
= 0; i
< originalData
.length
; i
++) {
2696 var data
= originalData
[i
][1];
2698 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2700 if (y
!== null && !isNaN(y
)) {
2706 if (i
- rollPeriod
>= 0) {
2707 var prev
= originalData
[i
- rollPeriod
];
2708 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2716 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2717 1.0 * (mid
- low
) / count
,
2718 1.0 * (high
- mid
) / count
]];
2720 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2724 // Calculate the rolling average for the first rollPeriod - 1 points where
2725 // there is not enough data to roll over the full number of points
2726 if (!this.attr_("errorBars")){
2727 if (rollPeriod
== 1) {
2728 return originalData
;
2731 for (i
= 0; i
< originalData
.length
; i
++) {
2734 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2735 y
= originalData
[j
][1];
2736 if (y
=== null || isNaN(y
)) continue;
2738 sum
+= originalData
[j
][1];
2741 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2743 rollingData
[i
] = [originalData
[i
][0], null];
2748 for (i
= 0; i
< originalData
.length
; i
++) {
2752 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2753 y
= originalData
[j
][1][0];
2754 if (y
=== null || isNaN(y
)) continue;
2756 sum
+= originalData
[j
][1][0];
2757 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2760 stddev
= Math
.sqrt(variance
) / num_ok
;
2761 rollingData
[i
] = [originalData
[i
][0],
2762 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2764 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2774 * Detects the type of the str (date or numeric) and sets the various
2775 * formatting attributes in this.attrs_ based on this type.
2776 * @param {String} str An x value.
2779 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2781 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2782 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2783 str
.indexOf('/') >= 0 ||
2784 isNaN(parseFloat(str
))) {
2786 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2787 // TODO(danvk): remove support for this format.
2791 this.setXAxisOptions_(isDate
);
2794 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2796 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2797 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2798 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2799 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2801 /** @private (shut up, jsdoc!) */
2802 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2803 // TODO(danvk): use Dygraph.numberValueFormatter here?
2804 /** @private (shut up, jsdoc!) */
2805 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2806 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2807 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2812 * Parses the value as a floating point number. This is like the parseFloat()
2813 * built-in, but with a few differences:
2814 * - the empty string is parsed as null, rather than NaN.
2815 * - if the string cannot be parsed at all, an error is logged.
2816 * If the string can't be parsed, this method returns null.
2817 * @param {String} x The string to be parsed
2818 * @param {Number} opt_line_no The line number from which the string comes.
2819 * @param {String} opt_line The text of the line from which the string comes.
2823 // Parse the x as a float or return null if it's not a number.
2824 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2825 var val
= parseFloat(x
);
2826 if (!isNaN(val
)) return val
;
2828 // Try to figure out what happeend.
2829 // If the value is the empty string, parse it as null.
2830 if (/^ *$/.test(x
)) return null;
2832 // If it was actually "NaN", return it as NaN.
2833 if (/^ *nan *$/i.test(x
)) return NaN
;
2835 // Looks like a parsing error.
2836 var msg
= "Unable to parse '" + x
+ "' as a number";
2837 if (opt_line
!== null && opt_line_no
!== null) {
2838 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2847 * Parses a string in a special csv format. We expect a csv file where each
2848 * line is a date point, and the first field in each line is the date string.
2849 * We also expect that all remaining fields represent series.
2850 * if the errorBars attribute is set, then interpret the fields as:
2851 * date, series1, stddev1, series2, stddev2, ...
2852 * @param {[Object]} data See above.
2854 * @return [Object] An array with one entry for each row. These entries
2855 * are an array of cells in that row. The first entry is the parsed x-value for
2856 * the row. The second, third, etc. are the y-values. These can take on one of
2857 * three forms, depending on the CSV and constructor parameters:
2859 * 2. [ value, stddev ]
2860 * 3. [ low value, center value, high value ]
2862 Dygraph
.prototype.parseCSV_
= function(data
) {
2864 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2865 var lines
= data
.split(line_delimiter
|| "\n");
2868 // Use the default delimiter or fall back to a tab if that makes sense.
2869 var delim
= this.attr_('delimiter');
2870 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2875 if (!('labels' in this.user_attrs_
)) {
2876 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2878 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2879 this.attributes_
.reparseSeries();
2884 var defaultParserSet
= false; // attempt to auto-detect x value type
2885 var expectedCols
= this.attr_("labels").length
;
2886 var outOfOrder
= false;
2887 for (var i
= start
; i
< lines
.length
; i
++) {
2888 var line
= lines
[i
];
2890 if (line
.length
=== 0) continue; // skip blank lines
2891 if (line
[0] == '#') continue; // skip comment lines
2892 var inFields
= line
.split(delim
);
2893 if (inFields
.length
< 2) continue;
2896 if (!defaultParserSet
) {
2897 this.detectTypeFromString_(inFields
[0]);
2898 xParser
= this.attr_("xValueParser");
2899 defaultParserSet
= true;
2901 fields
[0] = xParser(inFields
[0], this);
2903 // If fractions are expected, parse the numbers as "A/B
"
2904 if (this.fractions_) {
2905 for (j = 1; j < inFields.length; j++) {
2906 // TODO(danvk): figure out an appropriate way to flag parse errors.
2907 vals = inFields[j].split("/");
2908 if (vals.length != 2) {
2909 this.error('Expected fractional "num
/den
" values in CSV data ' +
2910 "but found a value
'" + inFields[j] + "' on line
" +
2911 (1 + i) + " ('" + line + "') which is not of
this form
.");
2914 fields[j] = [this.parseFloat_(vals[0], i, line),
2915 this.parseFloat_(vals[1], i, line)];
2918 } else if (this.attr_("errorBars
")) {
2919 // If there are error bars, values are (value, stddev) pairs
2920 if (inFields.length % 2 != 1) {
2921 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2922 'but line ' + (1 + i) + ' has an odd number of values (' +
2923 (inFields.length - 1) + "): '" + line + "'");
2925 for (j = 1; j < inFields.length; j += 2) {
2926 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2927 this.parseFloat_(inFields[j + 1], i, line)];
2929 } else if (this.attr_("customBars
")) {
2930 // Bars are a low;center;high tuple
2931 for (j = 1; j < inFields.length; j++) {
2932 var val = inFields[j];
2933 if (/^ *$/.test(val)) {
2934 fields[j] = [null, null, null];
2936 vals = val.split(";");
2937 if (vals.length == 3) {
2938 fields[j] = [ this.parseFloat_(vals[0], i, line),
2939 this.parseFloat_(vals[1], i, line),
2940 this.parseFloat_(vals[2], i, line) ];
2942 this.warn('When using customBars, values must be either blank ' +
2943 'or "low
;center
;high
" tuples (got "' + val +
2944 '" on line ' + (1+i));
2949 // Values are just numbers
2950 for (j = 1; j < inFields.length; j++) {
2951 fields[j] = this.parseFloat_(inFields[j], i, line);
2954 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2958 if (fields.length != expectedCols) {
2959 this.error("Number of columns
in line
" + i + " (" + fields.length +
2960 ") does not agree
with number of
labels (" + expectedCols +
2964 // If the user specified the 'labels' option and none of the cells of the
2965 // first row parsed correctly, then they probably double-specified the
2966 // labels. We go with the values set in the option, discard this row and
2967 // log a warning to the JS console.
2968 if (i === 0 && this.attr_('labels')) {
2969 var all_null = true;
2970 for (j = 0; all_null && j < fields.length; j++) {
2971 if (fields[j]) all_null = false;
2974 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2975 "CSV
data ('" + line + "') appears to also contain labels
. " +
2976 "Will drop the CSV labels and
use the option labels
.");
2984 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2985 ret.sort(function(a,b) { return a[0] - b[0]; });
2993 * The user has provided their data as a pre-packaged JS array. If the x values
2994 * are numeric, this is the same as dygraphs' internal format. If the x values
2995 * are dates, we need to convert them from Date objects to ms since epoch.
2996 * @param {[Object]} data
2997 * @return {[Object]} data with numeric x values.
2999 Dygraph.prototype.parseArray_ = function(data) {
3000 // Peek at the first x value to see if it's numeric.
3001 if (data.length === 0) {
3002 this.error("Can
't plot empty data set");
3005 if (data[0].length === 0) {
3006 this.error("Data set cannot contain an empty row");
3011 if (this.attr_("labels") === null) {
3012 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3013 "in the options parameter");
3014 this.attrs_.labels = [ "X" ];
3015 for (i = 1; i < data[0].length; i++) {
3016 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3018 this.attributes_.reparseSeries();
3020 var num_labels = this.attr_("labels");
3021 if (num_labels.length != data[0].length) {
3022 this.error("Mismatch between number of labels (" + num_labels +
3023 ") and number of columns in array (" + data[0].length + ")");
3028 if (Dygraph.isDateLike(data[0][0])) {
3029 // Some intelligent defaults for a date x-axis.
3030 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3031 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3032 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3034 // Assume they're all dates
.
3035 var parsedData
= Dygraph
.clone(data
);
3036 for (i
= 0; i
< data
.length
; i
++) {
3037 if (parsedData
[i
].length
=== 0) {
3038 this.error("Row " + (1 + i
) + " of data is empty");
3041 if (parsedData
[i
][0] === null ||
3042 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3043 isNaN(parsedData
[i
][0].getTime())) {
3044 this.error("x value in row " + (1 + i
) + " is not a Date");
3047 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3051 // Some intelligent defaults for a numeric x-axis.
3052 /** @private (shut up, jsdoc!) */
3053 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3054 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3055 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3061 * Parses a DataTable object from gviz.
3062 * The data is expected to have a first column that is either a date or a
3063 * number. All subsequent columns must be numbers. If there is a clear mismatch
3064 * between this.xValueParser_ and the type of the first column, it will be
3065 * fixed. Fills out rawData_.
3066 * @param {[Object]} data See above.
3069 Dygraph
.prototype.parseDataTable_
= function(data
) {
3070 var shortTextForAnnotationNum
= function(num
) {
3071 // converts [0-9]+ [A-Z][a-z]*
3072 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3073 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3074 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3075 num
= Math
.floor(num
/ 26);
3077 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3078 num
= Math
.floor((num
- 1) / 26);
3083 var cols
= data
.getNumberOfColumns();
3084 var rows
= data
.getNumberOfRows();
3086 var indepType
= data
.getColumnType(0);
3087 if (indepType
== 'date' || indepType
== 'datetime') {
3088 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3089 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3090 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3091 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3092 } else if (indepType
== 'number') {
3093 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3094 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3095 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3096 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3098 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3099 "column 1 of DataTable input (Got '" + indepType
+ "')");
3103 // Array of the column indices which contain data (and not annotations).
3105 var annotationCols
= {}; // data index -> [annotation cols]
3106 var hasAnnotations
= false;
3108 for (i
= 1; i
< cols
; i
++) {
3109 var type
= data
.getColumnType(i
);
3110 if (type
== 'number') {
3112 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3113 // This is OK -- it's an annotation column.
3114 var dataIdx
= colIdx
[colIdx
.length
- 1];
3115 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3116 annotationCols
[dataIdx
] = [i
];
3118 annotationCols
[dataIdx
].push(i
);
3120 hasAnnotations
= true;
3122 this.error("Only 'number' is supported as a dependent type with Gviz." +
3123 " 'string' is only supported if displayAnnotations is true");
3127 // Read column labels
3128 // TODO(danvk): add support back for errorBars
3129 var labels
= [data
.getColumnLabel(0)];
3130 for (i
= 0; i
< colIdx
.length
; i
++) {
3131 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3132 if (this.attr_("errorBars")) i
+= 1;
3134 this.attrs_
.labels
= labels
;
3135 cols
= labels
.length
;
3138 var outOfOrder
= false;
3139 var annotations
= [];
3140 for (i
= 0; i
< rows
; i
++) {
3142 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3143 data
.getValue(i
, 0) === null) {
3144 this.warn("Ignoring row " + i
+
3145 " of DataTable because of undefined or null first column.");
3149 if (indepType
== 'date' || indepType
== 'datetime') {
3150 row
.push(data
.getValue(i
, 0).getTime());
3152 row
.push(data
.getValue(i
, 0));
3154 if (!this.attr_("errorBars")) {
3155 for (j
= 0; j
< colIdx
.length
; j
++) {
3156 var col
= colIdx
[j
];
3157 row
.push(data
.getValue(i
, col
));
3158 if (hasAnnotations
&&
3159 annotationCols
.hasOwnProperty(col
) &&
3160 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3162 ann
.series
= data
.getColumnLabel(col
);
3164 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3166 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3167 if (k
) ann
.text
+= "\n";
3168 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3170 annotations
.push(ann
);
3174 // Strip out infinities, which give dygraphs problems later on.
3175 for (j
= 0; j
< row
.length
; j
++) {
3176 if (!isFinite(row
[j
])) row
[j
] = null;
3179 for (j
= 0; j
< cols
- 1; j
++) {
3180 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3183 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3190 this.warn("DataTable is out of order; order it correctly to speed loading.");
3191 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3193 this.rawData_
= ret
;
3195 if (annotations
.length
> 0) {
3196 this.setAnnotations(annotations
, true);
3198 this.attributes_
.reparseSeries();
3202 * Get the CSV data. If it's in a function, call that function. If it's in a
3203 * file, do an XMLHttpRequest to get it.
3206 Dygraph
.prototype.start_
= function() {
3207 var data
= this.file_
;
3209 // Functions can return references of all other types.
3210 if (typeof data
== 'function') {
3214 if (Dygraph
.isArrayLike(data
)) {
3215 this.rawData_
= this.parseArray_(data
);
3217 } else if (typeof data
== 'object' &&
3218 typeof data
.getColumnRange
== 'function') {
3219 // must be a DataTable from gviz.
3220 this.parseDataTable_(data
);
3222 } else if (typeof data
== 'string') {
3223 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3224 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3225 if (line_delimiter
) {
3226 this.loadedEvent_(data
);
3228 var req
= new XMLHttpRequest();
3230 req
.onreadystatechange
= function () {
3231 if (req
.readyState
== 4) {
3232 if (req
.status
=== 200 || // Normal http
3233 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3234 caller
.loadedEvent_(req
.responseText
);
3239 req
.open("GET", data
, true);
3243 this.error("Unknown data format: " + (typeof data
));
3248 * Changes various properties of the graph. These can include:
3250 * <li>file: changes the source data for the graph</li>
3251 * <li>errorBars: changes whether the data contains stddev</li>
3254 * There's a huge variety of options that can be passed to this method. For a
3255 * full list, see http://dygraphs.com/options.html.
3257 * @param {Object} attrs The new properties and values
3258 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3259 * call to updateOptions(). If you know better, you can pass true to explicitly
3260 * block the redraw. This can be useful for chaining updateOptions() calls,
3261 * avoiding the occasional infinite loop and preventing redraws when it's not
3262 * necessary (e.g. when updating a callback).
3264 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3265 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3267 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3268 var file
= input_attrs
.file
;
3269 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3271 // TODO(danvk): this is a mess. Move these options into attr_.
3272 if ('rollPeriod' in attrs
) {
3273 this.rollPeriod_
= attrs
.rollPeriod
;
3275 if ('dateWindow' in attrs
) {
3276 this.dateWindow_
= attrs
.dateWindow
;
3277 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3278 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3281 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3282 this.zoomed_y_
= (attrs
.valueRange
!== null);
3285 // TODO(danvk): validate per-series options.
3290 // highlightCircleSize
3292 // Check if this set options will require new points.
3293 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3295 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3297 this.attributes_
.reparseSeries();
3301 if (!block_redraw
) this.start_();
3303 if (!block_redraw
) {
3304 if (requiresNewPoints
) {
3307 this.renderGraph_(false);
3314 * Returns a copy of the options with deprecated names converted into current
3315 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3316 * interested in that, they should save a copy before calling this.
3319 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3321 for (var k
in attrs
) {
3322 if (k
== 'file') continue;
3323 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3326 var set
= function(axis
, opt
, value
) {
3327 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3328 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3329 my_attrs
.axes
[axis
][opt
] = value
;
3331 var map
= function(opt
, axis
, new_opt
) {
3332 if (typeof(attrs
[opt
]) != 'undefined') {
3333 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3334 new_opt
+ " option for the " + axis
+ " axis instead. " +
3335 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3336 "(see http://dygraphs.com/per-axis.html for more information.");
3337 set(axis
, new_opt
, attrs
[opt
]);
3338 delete my_attrs
[opt
];
3342 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3343 map('xValueFormatter', 'x', 'valueFormatter');
3344 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3345 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3346 map('xTicker', 'x', 'ticker');
3347 map('yValueFormatter', 'y', 'valueFormatter');
3348 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3349 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3350 map('yTicker', 'y', 'ticker');
3355 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3356 * containing div (which has presumably changed size since the dygraph was
3357 * instantiated. If the width/height are specified, the div will be resized.
3359 * This is far more efficient than destroying and re-instantiating a
3360 * Dygraph, since it doesn't have to reparse the underlying data.
3362 * @param {Number} [width] Width (in pixels)
3363 * @param {Number} [height] Height (in pixels)
3365 Dygraph
.prototype.resize
= function(width
, height
) {
3366 if (this.resize_lock
) {
3369 this.resize_lock
= true;
3371 if ((width
=== null) != (height
=== null)) {
3372 this.warn("Dygraph.resize() should be called with zero parameters or " +
3373 "two non-NULL parameters. Pretending it was zero.");
3374 width
= height
= null;
3377 var old_width
= this.width_
;
3378 var old_height
= this.height_
;
3381 this.maindiv_
.style
.width
= width
+ "px";
3382 this.maindiv_
.style
.height
= height
+ "px";
3383 this.width_
= width
;
3384 this.height_
= height
;
3386 this.width_
= this.maindiv_
.clientWidth
;
3387 this.height_
= this.maindiv_
.clientHeight
;
3390 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3391 // TODO(danvk): there should be a clear() method.
3392 this.maindiv_
.innerHTML
= "";
3393 this.roller_
= null;
3394 this.attrs_
.labelsDiv
= null;
3395 this.createInterface_();
3396 if (this.annotations_
.length
) {
3397 // createInterface_ reset the layout, so we need to do this.
3398 this.layout_
.setAnnotations(this.annotations_
);
3400 this.createDragInterface_();
3404 this.resize_lock
= false;
3408 * Adjusts the number of points in the rolling average. Updates the graph to
3409 * reflect the new averaging period.
3410 * @param {Number} length Number of points over which to average the data.
3412 Dygraph
.prototype.adjustRoll
= function(length
) {
3413 this.rollPeriod_
= length
;
3418 * Returns a boolean array of visibility statuses.
3420 Dygraph
.prototype.visibility
= function() {
3421 // Do lazy-initialization, so that this happens after we know the number of
3423 if (!this.attr_("visibility")) {
3424 this.attrs_
.visibility
= [];
3426 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3427 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3428 this.attrs_
.visibility
.push(true);
3430 return this.attr_("visibility");
3434 * Changes the visiblity of a series.
3436 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3437 var x
= this.visibility();
3438 if (num
< 0 || num
>= x
.length
) {
3439 this.warn("invalid series number in setVisibility: " + num
);
3447 * How large of an area will the dygraph render itself in?
3448 * This is used for testing.
3449 * @return A {width: w, height: h} object.
3452 Dygraph
.prototype.size
= function() {
3453 return { width
: this.width_
, height
: this.height_
};
3457 * Update the list of annotations and redraw the chart.
3458 * See dygraphs.com/annotations.html for more info on how to use annotations.
3459 * @param ann {Array} An array of annotation objects.
3460 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3462 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3463 // Only add the annotation CSS rule once we know it will be used.
3464 Dygraph
.addAnnotationRule();
3465 this.annotations_
= ann
;
3466 this.layout_
.setAnnotations(this.annotations_
);
3467 if (!suppressDraw
) {
3473 * Return the list of annotations.
3475 Dygraph
.prototype.annotations
= function() {
3476 return this.annotations_
;
3480 * Get the list of label names for this graph. The first column is the
3481 * x-axis, so the data series names start at index 1.
3483 Dygraph
.prototype.getLabels
= function() {
3484 return this.attr_("labels").slice();
3488 * Get the index of a series (column) given its name. The first column is the
3489 * x-axis, so the data series start with index 1.
3491 Dygraph
.prototype.indexFromSetName
= function(name
) {
3492 return this.setIndexByName_
[name
];
3496 * Get the internal dataset index given its name. These are numbered starting from 0,
3497 * and only count visible sets.
3500 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3501 return this.datasetIndex_
[this.indexFromSetName(name
)];
3506 * Adds a default style for the annotation CSS classes to the document. This is
3507 * only executed when annotations are actually used. It is designed to only be
3508 * called once -- all calls after the first will return immediately.
3510 Dygraph
.addAnnotationRule
= function() {
3511 // TODO(danvk): move this function into plugins/annotations.js
?
3512 if (Dygraph
.addedAnnotationCSS
) return;
3514 var rule
= "border: 1px solid black; " +
3515 "background-color: white; " +
3516 "text-align: center;";
3518 var styleSheetElement
= document
.createElement("style");
3519 styleSheetElement
.type
= "text/css";
3520 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3522 // Find the first style sheet that we can access.
3523 // We may not add a rule to a style sheet from another domain for security
3524 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3525 // adds its own style sheets from google.com.
3526 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3527 if (document
.styleSheets
[i
].disabled
) continue;
3528 var mysheet
= document
.styleSheets
[i
];
3530 if (mysheet
.insertRule
) { // Firefox
3531 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3532 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3533 } else if (mysheet
.addRule
) { // IE
3534 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3536 Dygraph
.addedAnnotationCSS
= true;
3539 // Was likely a security exception.
3543 this.warn("Unable to add default annotation CSS rule; display may be off.");
3546 // Older pages may still use this name.
3547 var DateGraph
= Dygraph
;