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 // Don't recreate and register the handlers on subsequent calls.
960 // This happens when the graph is resized.
961 if (!this.mouseMoveHandler_
) {
962 this.mouseMoveHandler_
= function(e
) {
963 dygraph
.mouseMove_(e
);
965 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler_
);
967 this.mouseOutHandler_
= function(e
) {
968 dygraph
.mouseOut_(e
);
970 this.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler_
);
972 this.resizeHandler_
= function(e
) {
976 // Update when the window is resized.
977 // TODO(danvk): drop frames depending on complexity of the chart.
978 this.addEvent(window
, 'resize', this.resizeHandler_
);
983 * Detach DOM elements in the dygraph and null out all data references.
984 * Calling this when you're done with a dygraph can dramatically reduce memory
985 * usage. See, e.g., the tests/perf.html example.
987 Dygraph
.prototype.destroy
= function() {
988 var removeRecursive
= function(node
) {
989 while (node
.hasChildNodes()) {
990 removeRecursive(node
.firstChild
);
991 node
.removeChild(node
.firstChild
);
995 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
996 var reg
= this.registeredEvents_
[idx
];
997 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
999 this.registeredEvents_
= [];
1001 // remove mouse event handlers (This may not be necessary anymore)
1002 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler_
);
1003 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler_
);
1004 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
1006 // remove window handlers
1007 Dygraph
.removeEvent(window
,'resize',this.resizeHandler_
);
1008 this.resizeHandler_
= null;
1010 removeRecursive(this.maindiv_
);
1012 var nullOut
= function(obj
) {
1013 for (var n
in obj
) {
1014 if (typeof(obj
[n
]) === 'object') {
1019 // These may not all be necessary, but it can't hurt...
1020 nullOut(this.layout_
);
1021 nullOut(this.plotter_
);
1026 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1027 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1028 * or the zoom rectangles) is done on this.canvas_.
1029 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1030 * @return {Object} The newly-created canvas
1033 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1034 var h
= Dygraph
.createCanvas();
1035 h
.style
.position
= "absolute";
1036 // TODO(danvk): h should be offset from canvas. canvas needs to include
1037 // some extra area to make it easier to zoom in on the far left and far
1038 // right. h needs to be precisely the plot area, so that clipping occurs.
1039 h
.style
.top
= canvas
.style
.top
;
1040 h
.style
.left
= canvas
.style
.left
;
1041 h
.width
= this.width_
;
1042 h
.height
= this.height_
;
1043 h
.style
.width
= this.width_
+ "px"; // for IE
1044 h
.style
.height
= this.height_
+ "px"; // for IE
1049 * Creates an overlay element used to handle mouse events.
1050 * @return {Object} The mouse event element.
1053 Dygraph
.prototype.createMouseEventElement_
= function() {
1054 if (this.isUsingExcanvas_
) {
1055 var elem
= document
.createElement("div");
1056 elem
.style
.position
= 'absolute';
1057 elem
.style
.backgroundColor
= 'white';
1058 elem
.style
.filter
= 'alpha(opacity=0)';
1059 elem
.style
.width
= this.width_
+ "px";
1060 elem
.style
.height
= this.height_
+ "px";
1061 this.graphDiv
.appendChild(elem
);
1064 return this.canvas_
;
1069 * Generate a set of distinct colors for the data series. This is done with a
1070 * color wheel. Saturation/Value are customizable, and the hue is
1071 * equally-spaced around the color wheel. If a custom set of colors is
1072 * specified, that is used instead.
1075 Dygraph
.prototype.setColors_
= function() {
1076 var labels
= this.getLabels();
1077 var num
= labels
.length
- 1;
1079 this.colorsMap_
= {};
1080 var colors
= this.attr_('colors');
1083 var sat
= this.attr_('colorSaturation') || 1.0;
1084 var val
= this.attr_('colorValue') || 0.5;
1085 var half
= Math
.ceil(num
/ 2);
1086 for (i
= 1; i
<= num
; i
++) {
1087 if (!this.visibility()[i
-1]) continue;
1088 // alternate colors for high contrast.
1089 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1090 var hue
= (1.0 * idx
/ (1 + num
));
1091 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1092 this.colors_
.push(colorStr
);
1093 this.colorsMap_
[labels
[i
]] = colorStr
;
1096 for (i
= 0; i
< num
; i
++) {
1097 if (!this.visibility()[i
]) continue;
1098 var colorStr
= colors
[i
% colors
.length
];
1099 this.colors_
.push(colorStr
);
1100 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1106 * Return the list of colors. This is either the list of colors passed in the
1107 * attributes or the autogenerated list of rgb(r,g,b) strings.
1108 * This does not return colors for invisible series.
1109 * @return {Array<string>} The list of colors.
1111 Dygraph
.prototype.getColors
= function() {
1112 return this.colors_
;
1116 * Returns a few attributes of a series, i.e. its color, its visibility, which
1117 * axis it's assigned to, and its column in the original data.
1118 * Returns null if the series does not exist.
1119 * Otherwise, returns an object with column, visibility, color and axis properties.
1120 * The "axis" property will be set to 1 for y1 and 2 for y2.
1121 * The "column" property can be fed back into getValue(row, column) to get
1122 * values for this series.
1124 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1126 var labels
= this.getLabels();
1127 for (var i
= 1; i
< labels
.length
; i
++) {
1128 if (labels
[i
] == series_name
) {
1133 if (idx
== -1) return null;
1138 visible
: this.visibility()[idx
- 1],
1139 color
: this.colorsMap_
[series_name
],
1140 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1145 * Create the text box to adjust the averaging period
1148 Dygraph
.prototype.createRollInterface_
= function() {
1149 // Create a roller if one doesn't exist already.
1150 if (!this.roller_
) {
1151 this.roller_
= document
.createElement("input");
1152 this.roller_
.type
= "text";
1153 this.roller_
.style
.display
= "none";
1154 this.graphDiv
.appendChild(this.roller_
);
1157 var display
= this.attr_('showRoller') ? 'block' : 'none';
1159 var area
= this.plotter_
.area
;
1160 var textAttr
= { "position": "absolute",
1162 "top": (area
.y
+ area
.h
- 25) + "px",
1163 "left": (area
.x
+ 1) + "px",
1166 this.roller_
.size
= "2";
1167 this.roller_
.value
= this.rollPeriod_
;
1168 for (var name
in textAttr
) {
1169 if (textAttr
.hasOwnProperty(name
)) {
1170 this.roller_
.style
[name
] = textAttr
[name
];
1175 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1180 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1181 * canvas (i.e. DOM Coords).
1183 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1184 return Dygraph
.pageX(e
) - context
.px
;
1189 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1190 * canvas (i.e. DOM Coords).
1192 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1193 return Dygraph
.pageY(e
) - context
.py
;
1197 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1201 Dygraph
.prototype.createDragInterface_
= function() {
1203 // Tracks whether the mouse is down right now
1205 isPanning
: false, // is this drag part of a pan?
1206 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1207 dragStartX
: null, // pixel coordinates
1208 dragStartY
: null, // pixel coordinates
1209 dragEndX
: null, // pixel coordinates
1210 dragEndY
: null, // pixel coordinates
1211 dragDirection
: null,
1212 prevEndX
: null, // pixel coordinates
1213 prevEndY
: null, // pixel coordinates
1214 prevDragDirection
: null,
1215 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1217 // The value on the left side of the graph when a pan operation starts.
1218 initialLeftmostDate
: null,
1220 // The number of units each pixel spans. (This won't be valid for log
1222 xUnitsPerPixel
: null,
1224 // TODO(danvk): update this comment
1225 // The range in second/value units that the viewport encompasses during a
1226 // panning operation.
1229 // Top-left corner of the canvas, in DOM coords
1230 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1234 // Values for use with panEdgeFraction, which limit how far outside the
1235 // graph's data boundaries it can be panned.
1236 boundedDates
: null, // [minDate, maxDate]
1237 boundedValues
: null, // [[minValue, maxValue] ...]
1239 // We cover iframes during mouse interactions. See comments in
1240 // dygraph-utils.js for more info on why this is a good idea.
1241 tarp
: new Dygraph
.IFrameTarp(),
1243 // contextB is the same thing as this context object but renamed.
1244 initializeMouseDown
: function(event
, g
, contextB
) {
1245 // prevents mouse drags from selecting page text.
1246 if (event
.preventDefault
) {
1247 event
.preventDefault(); // Firefox, Chrome, etc.
1249 event
.returnValue
= false; // IE
1250 event
.cancelBubble
= true;
1253 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1254 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1255 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1256 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1257 contextB
.cancelNextDblclick
= false;
1258 contextB
.tarp
.cover();
1262 var interactionModel
= this.attr_("interactionModel");
1264 // Self is the graph.
1267 // Function that binds the graph and context to the handler.
1268 var bindHandler
= function(handler
) {
1269 return function(event
) {
1270 handler(event
, self
, context
);
1274 for (var eventName
in interactionModel
) {
1275 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1276 this.addEvent(this.mouseEventElement_
, eventName
,
1277 bindHandler(interactionModel
[eventName
]));
1280 // If the user releases the mouse button during a drag, but not over the
1281 // canvas, then it doesn't count as a zooming action.
1282 this.mouseUpHandler_
= function(event
) {
1283 if (context
.isZooming
|| context
.isPanning
) {
1284 context
.isZooming
= false;
1285 context
.dragStartX
= null;
1286 context
.dragStartY
= null;
1289 if (context
.isPanning
) {
1290 context
.isPanning
= false;
1291 context
.draggingDate
= null;
1292 context
.dateRange
= null;
1293 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1294 delete self
.axes_
[i
].draggingValue
;
1295 delete self
.axes_
[i
].dragValueRange
;
1299 context
.tarp
.uncover();
1302 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1306 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1307 * up any previous zoom rectangles that were drawn. This could be optimized to
1308 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1311 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1312 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1313 * @param {Number} startX The X position where the drag started, in canvas
1315 * @param {Number} endX The current X position of the drag, in canvas coords.
1316 * @param {Number} startY The Y position where the drag started, in canvas
1318 * @param {Number} endY The current Y position of the drag, in canvas coords.
1319 * @param {Number} prevDirection the value of direction on the previous call to
1320 * this function. Used to avoid excess redrawing
1321 * @param {Number} prevEndX The value of endX on the previous call to this
1322 * function. Used to avoid excess redrawing
1323 * @param {Number} prevEndY The value of endY on the previous call to this
1324 * function. Used to avoid excess redrawing
1327 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1328 endY
, prevDirection
, prevEndX
,
1330 var ctx
= this.canvas_ctx_
;
1332 // Clean up from the previous rect if necessary
1333 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1334 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1335 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1336 } else if (prevDirection
== Dygraph
.VERTICAL
){
1337 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1338 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1341 // Draw a light-grey rectangle to show the new viewing area
1342 if (direction
== Dygraph
.HORIZONTAL
) {
1343 if (endX
&& startX
) {
1344 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1345 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1346 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1348 } else if (direction
== Dygraph
.VERTICAL
) {
1349 if (endY
&& startY
) {
1350 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1351 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1352 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1356 if (this.isUsingExcanvas_
) {
1357 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1362 * Clear the zoom rectangle (and perform no zoom).
1365 Dygraph
.prototype.clearZoomRect_
= function() {
1366 this.currentZoomRectArgs_
= null;
1367 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1371 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1372 * the canvas. The exact zoom window may be slightly larger if there are no data
1373 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1374 * which accepts dates that match the raw data. This function redraws the graph.
1376 * @param {Number} lowX The leftmost pixel value that should be visible.
1377 * @param {Number} highX The rightmost pixel value that should be visible.
1380 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1381 this.currentZoomRectArgs_
= null;
1382 // Find the earliest and latest dates contained in this canvasx range.
1383 // Convert the call to date ranges of the raw data.
1384 var minDate
= this.toDataXCoord(lowX
);
1385 var maxDate
= this.toDataXCoord(highX
);
1386 this.doZoomXDates_(minDate
, maxDate
);
1390 * Transition function to use in animations. Returns values between 0.0
1391 * (totally old values) and 1.0 (totally new values) for each frame.
1394 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1396 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1400 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1401 * method with doZoomX which accepts pixel coordinates. This function redraws
1404 * @param {Number} minDate The minimum date that should be visible.
1405 * @param {Number} maxDate The maximum date that should be visible.
1408 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1409 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1410 // can produce strange effects. Rather than the y-axis transitioning slowly
1411 // between values, it can jerk around.)
1412 var old_window
= this.xAxisRange();
1413 var new_window
= [minDate
, maxDate
];
1414 this.zoomed_x_
= true;
1416 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1417 if (that
.attr_("zoomCallback")) {
1418 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1424 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1425 * the canvas. This function redraws the graph.
1427 * @param {Number} lowY The topmost pixel value that should be visible.
1428 * @param {Number} highY The lowest pixel value that should be visible.
1431 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1432 this.currentZoomRectArgs_
= null;
1433 // Find the highest and lowest values in pixel range for each axis.
1434 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1435 // This is because pixels increase as you go down on the screen, whereas data
1436 // coordinates increase as you go up the screen.
1437 var oldValueRanges
= this.yAxisRanges();
1438 var newValueRanges
= [];
1439 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1440 var hi
= this.toDataYCoord(lowY
, i
);
1441 var low
= this.toDataYCoord(highY
, i
);
1442 newValueRanges
.push([low
, hi
]);
1445 this.zoomed_y_
= true;
1447 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1448 if (that
.attr_("zoomCallback")) {
1449 var xRange
= that
.xAxisRange();
1450 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1456 * Reset the zoom to the original view coordinates. This is the same as
1457 * double-clicking on the graph.
1459 Dygraph
.prototype.resetZoom
= function() {
1460 var dirty
= false, dirtyX
= false, dirtyY
= false;
1461 if (this.dateWindow_
!== null) {
1466 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1467 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1473 // Clear any selection, since it's likely to be drawn in the wrong place.
1474 this.clearSelection();
1477 this.zoomed_x_
= false;
1478 this.zoomed_y_
= false;
1480 var minDate
= this.rawData_
[0][0];
1481 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1483 // With only one frame, don't bother calculating extreme ranges.
1484 // TODO(danvk): merge this block w/ the code below
.
1485 if (!this.attr_("animatedZooms")) {
1486 this.dateWindow_
= null;
1487 for (i
= 0; i
< this.axes_
.length
; i
++) {
1488 if (this.axes_
[i
].valueWindow
!== null) {
1489 delete this.axes_
[i
].valueWindow
;
1493 if (this.attr_("zoomCallback")) {
1494 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1499 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1501 oldWindow
= this.xAxisRange();
1502 newWindow
= [minDate
, maxDate
];
1506 oldValueRanges
= this.yAxisRanges();
1507 // TODO(danvk): this is pretty inefficient
1508 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1509 var extremes
= packed
[1];
1511 // this has the side-effect of modifying this.axes_.
1512 // this doesn't make much sense in this context, but it's convenient (we
1513 // need this.axes_[*].extremeValues) and not harmful since we'll be
1514 // calling drawGraph_ shortly, which clobbers these values.
1515 this.computeYAxisRanges_(extremes
);
1517 newValueRanges
= [];
1518 for (i
= 0; i
< this.axes_
.length
; i
++) {
1519 var axis
= this.axes_
[i
];
1520 newValueRanges
.push((axis
.valueRange
!== null &&
1521 axis
.valueRange
!== undefined
) ?
1522 axis
.valueRange
: axis
.extremeRange
);
1527 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1529 that
.dateWindow_
= null;
1530 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1531 if (that
.axes_
[i
].valueWindow
!== null) {
1532 delete that
.axes_
[i
].valueWindow
;
1535 if (that
.attr_("zoomCallback")) {
1536 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1543 * Combined animation logic for all zoom functions.
1544 * either the x parameters or y parameters may be null.
1547 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1548 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1551 var valueRanges
= [];
1554 if (oldXRange
!== null && newXRange
!== null) {
1555 for (step
= 1; step
<= steps
; step
++) {
1556 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1557 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1558 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1562 if (oldYRanges
!== null && newYRanges
!== null) {
1563 for (step
= 1; step
<= steps
; step
++) {
1564 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1566 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1567 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1568 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1570 valueRanges
[step
-1] = thisRange
;
1575 Dygraph
.repeatAndCleanup(function(step
) {
1576 if (valueRanges
.length
) {
1577 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1578 var w
= valueRanges
[step
][i
];
1579 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1582 if (windows
.length
) {
1583 that
.dateWindow_
= windows
[step
];
1586 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1590 * Get the current graph's area object.
1592 * Returns: {x, y, w, h}
1594 Dygraph
.prototype.getArea
= function() {
1595 return this.plotter_
.area
;
1599 * Convert a mouse event to DOM coordinates relative to the graph origin.
1601 * Returns a two-element array: [X, Y].
1603 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1604 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1605 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1606 return [canvasx
, canvasy
];
1610 * Given a canvas X coordinate, find the closest row.
1611 * @param {Number} domX graph-relative DOM X coordinate
1612 * Returns: row number, integer
1615 Dygraph
.prototype.findClosestRow
= function(domX
) {
1616 var minDistX
= Infinity
;
1617 var pointIdx
= -1, setIdx
= -1;
1618 var sets
= this.layout_
.points
;
1619 for (var i
= 0; i
< sets
.length
; i
++) {
1620 var points
= sets
[i
];
1621 var len
= points
.length
;
1622 for (var j
= 0; j
< len
; j
++) {
1623 var point
= points
[j
];
1624 if (!Dygraph
.isValidPoint(point
, true)) continue;
1625 var dist
= Math
.abs(point
.canvasx
- domX
);
1626 if (dist
< minDistX
) {
1634 // TODO(danvk): remove this function; it's trivial and has only one use.
1635 return this.idxToRow_(setIdx
, pointIdx
);
1639 * Given canvas X,Y coordinates, find the closest point.
1641 * This finds the individual data point across all visible series
1642 * that's closest to the supplied DOM coordinates using the standard
1643 * Euclidean X,Y distance.
1645 * @param {Number} domX graph-relative DOM X coordinate
1646 * @param {Number} domY graph-relative DOM Y coordinate
1647 * Returns: {row, seriesName, point}
1650 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1651 var minDist
= Infinity
;
1653 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1654 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1655 var points
= this.layout_
.points
[setIdx
];
1656 for (var i
= 0; i
< points
.length
; ++i
) {
1657 var point
= points
[i
];
1658 if (!Dygraph
.isValidPoint(point
)) continue;
1659 dx
= point
.canvasx
- domX
;
1660 dy
= point
.canvasy
- domY
;
1661 dist
= dx
* dx
+ dy
* dy
;
1662 if (dist
< minDist
) {
1664 closestPoint
= point
;
1665 closestSeries
= setIdx
;
1670 var name
= this.layout_
.setNames
[closestSeries
];
1672 row
: idx
+ this.getLeftBoundary_(),
1679 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1681 * This first finds the X data point closest to the supplied DOM X coordinate,
1682 * then finds the series which puts the Y coordinate on top of its filled area,
1683 * using linear interpolation between adjacent point pairs.
1685 * @param {Number} domX graph-relative DOM X coordinate
1686 * @param {Number} domY graph-relative DOM Y coordinate
1687 * Returns: {row, seriesName, point}
1690 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1691 var row
= this.findClosestRow(domX
);
1692 var boundary
= this.getLeftBoundary_();
1693 var rowIdx
= row
- boundary
;
1694 var closestPoint
, closestSeries
;
1695 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1696 var points
= this.layout_
.points
[setIdx
];
1697 if (rowIdx
>= points
.length
) continue;
1698 var p1
= points
[rowIdx
];
1699 if (!Dygraph
.isValidPoint(p1
)) continue;
1700 var py
= p1
.canvasy
;
1701 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1702 // interpolate series Y value using next point
1703 var p2
= points
[rowIdx
+ 1];
1704 if (Dygraph
.isValidPoint(p2
)) {
1705 var dx
= p2
.canvasx
- p1
.canvasx
;
1707 var r
= (domX
- p1
.canvasx
) / dx
;
1708 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1711 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1712 // interpolate series Y value using previous point
1713 var p0
= points
[rowIdx
- 1];
1714 if (Dygraph
.isValidPoint(p0
)) {
1715 var dx
= p1
.canvasx
- p0
.canvasx
;
1717 var r
= (p1
.canvasx
- domX
) / dx
;
1718 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1722 // Stop if the point (domX, py) is above this series' upper edge
1723 if (setIdx
=== 0 || py
< domY
) {
1725 closestSeries
= setIdx
;
1728 var name
= this.layout_
.setNames
[closestSeries
];
1737 * When the mouse moves in the canvas, display information about a nearby data
1738 * point and draw dots over those points in the data series. This function
1739 * takes care of cleanup of previously-drawn dots.
1740 * @param {Object} event The mousemove event from the browser.
1743 Dygraph
.prototype.mouseMove_
= function(event
) {
1744 // This prevents JS errors when mousing over the canvas before data loads.
1745 var points
= this.layout_
.points
;
1746 if (points
=== undefined
|| points
=== null) return;
1748 var canvasCoords
= this.eventToDomCoords(event
);
1749 var canvasx
= canvasCoords
[0];
1750 var canvasy
= canvasCoords
[1];
1752 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1753 var selectionChanged
= false;
1754 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1756 if (this.attr_("stackedGraph")) {
1757 closest
= this.findStackedPoint(canvasx
, canvasy
);
1759 closest
= this.findClosestPoint(canvasx
, canvasy
);
1761 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1763 var idx
= this.findClosestRow(canvasx
);
1764 selectionChanged
= this.setSelection(idx
);
1767 var callback
= this.attr_("highlightCallback");
1768 if (callback
&& selectionChanged
) {
1769 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1774 * Fetch left offset from first defined boundaryIds record (see bug #236).
1777 Dygraph
.prototype.getLeftBoundary_
= function() {
1778 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1779 if (this.boundaryIds_
[i
] !== undefined
) {
1780 return this.boundaryIds_
[i
][0];
1787 * Transforms layout_.points index into data row number.
1788 * @param int layout_.points index
1789 * @return int row number, or -1 if none could be found.
1792 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1793 if (rowIdx
< 0) return -1;
1795 var boundary
= this.getLeftBoundary_();
1796 return boundary
+ rowIdx
;
1797 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1798 // var set = this.layout_.datasets[setIdx];
1799 // if (idx < set.length) {
1800 // return boundary + idx;
1802 // idx -= set.length;
1807 Dygraph
.prototype.animateSelection_
= function(direction
) {
1808 var totalSteps
= 10;
1810 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1811 if (this.animateId
=== undefined
) this.animateId
= 0;
1812 var start
= this.fadeLevel
;
1813 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1815 if (this.fadeLevel
) {
1816 this.updateSelection_(1.0);
1821 var thisId
= ++this.animateId
;
1823 Dygraph
.repeatAndCleanup(
1825 // ignore simultaneous animations
1826 if (that
.animateId
!= thisId
) return;
1828 that
.fadeLevel
+= direction
;
1829 if (that
.fadeLevel
=== 0) {
1830 that
.clearSelection();
1832 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1835 steps
, millis
, function() {});
1839 * Draw dots over the selectied points in the data series. This function
1840 * takes care of cleanup of previously-drawn dots.
1843 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1844 /*var defaultPrevented = */
1845 this.cascadeEvents_('select', {
1846 selectedX
: this.lastx_
,
1847 selectedPoints
: this.selPoints_
1849 // TODO(danvk): use defaultPrevented here?
1851 // Clear the previously drawn vertical, if there is one
1853 var ctx
= this.canvas_ctx_
;
1854 if (this.attr_('highlightSeriesOpts')) {
1855 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1856 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1858 // Activating background fade includes an animation effect for a gradual
1859 // fade. TODO(klausw): make this independently configurable if it causes
1860 // issues? Use a shared preference to control animations?
1861 var animateBackgroundFade
= true;
1862 if (animateBackgroundFade
) {
1863 if (opt_animFraction
=== undefined
) {
1864 // start a new animation
1865 this.animateSelection_(1);
1868 alpha
*= opt_animFraction
;
1870 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1871 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1874 // Redraw only the highlighted series in the interactive canvas (not the
1875 // static plot canvas, which is where series are usually drawn).
1876 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1877 } else if (this.previousVerticalX_
>= 0) {
1878 // Determine the maximum highlight circle size.
1879 var maxCircleSize
= 0;
1880 var labels
= this.attr_('labels');
1881 for (i
= 1; i
< labels
.length
; i
++) {
1882 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1883 if (r
> maxCircleSize
) maxCircleSize
= r
;
1885 var px
= this.previousVerticalX_
;
1886 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1887 2 * maxCircleSize
+ 2, this.height_
);
1890 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1891 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1894 if (this.selPoints_
.length
> 0) {
1895 // Draw colored circles over the center of each selected point
1896 var canvasx
= this.selPoints_
[0].canvasx
;
1898 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1899 var pt
= this.selPoints_
[i
];
1900 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1902 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1903 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1904 var color
= this.plotter_
.colors
[pt
.name
];
1906 callback
= Dygraph
.Circles
.DEFAULT
;
1908 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1909 ctx
.strokeStyle
= color
;
1910 ctx
.fillStyle
= color
;
1911 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1916 this.previousVerticalX_
= canvasx
;
1921 * Manually set the selected points and display information about them in the
1922 * legend. The selection can be cleared using clearSelection() and queried
1923 * using getSelection().
1924 * @param { Integer } row number that should be highlighted (i.e. appear with
1925 * hover dots on the chart). Set to false to clear any selection.
1926 * @param { seriesName } optional series name to highlight that series with the
1927 * the highlightSeriesOpts setting.
1928 * @param { locked } optional If true, keep seriesName selected when mousing
1929 * over the graph, disabling closest-series highlighting. Call clearSelection()
1932 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1933 // Extract the points we've selected
1934 this.selPoints_
= [];
1936 if (row
!== false) {
1937 row
-= this.getLeftBoundary_();
1940 var changed
= false;
1941 if (row
!== false && row
>= 0) {
1942 if (row
!= this.lastRow_
) changed
= true;
1943 this.lastRow_
= row
;
1944 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1945 var set
= this.layout_
.datasets
[setIdx
];
1946 if (row
< set
.length
) {
1947 var point
= this.layout_
.points
[setIdx
][row
];
1949 if (this.attr_("stackedGraph")) {
1950 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1953 if (point
.yval
!== null) this.selPoints_
.push(point
);
1957 if (this.lastRow_
>= 0) changed
= true;
1961 if (this.selPoints_
.length
) {
1962 this.lastx_
= this.selPoints_
[0].xval
;
1967 if (opt_seriesName
!== undefined
) {
1968 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1969 this.highlightSet_
= opt_seriesName
;
1972 if (opt_locked
!== undefined
) {
1973 this.lockedSet_
= opt_locked
;
1977 this.updateSelection_(undefined
);
1983 * The mouse has left the canvas. Clear out whatever artifacts remain
1984 * @param {Object} event the mouseout event from the browser.
1987 Dygraph
.prototype.mouseOut_
= function(event
) {
1988 if (this.attr_("unhighlightCallback")) {
1989 this.attr_("unhighlightCallback")(event
);
1992 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
1993 this.clearSelection();
1998 * Clears the current selection (i.e. points that were highlighted by moving
1999 * the mouse over the chart).
2001 Dygraph
.prototype.clearSelection
= function() {
2002 this.cascadeEvents_('deselect', {});
2004 this.lockedSet_
= false;
2005 // Get rid of the overlay data
2006 if (this.fadeLevel
) {
2007 this.animateSelection_(-1);
2010 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2012 this.selPoints_
= [];
2015 this.highlightSet_
= null;
2019 * Returns the number of the currently selected row. To get data for this row,
2020 * you can use the getValue method.
2021 * @return { Integer } row number, or -1 if nothing is selected
2023 Dygraph
.prototype.getSelection
= function() {
2024 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2028 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2029 var points
= this.layout_
.points
[setIdx
];
2030 for (var row
= 0; row
< points
.length
; row
++) {
2031 if (points
[row
].x
== this.selPoints_
[0].x
) {
2032 return row
+ this.getLeftBoundary_();
2040 * Returns the name of the currently-highlighted series.
2041 * Only available when the highlightSeriesOpts option is in use.
2043 Dygraph
.prototype.getHighlightSeries
= function() {
2044 return this.highlightSet_
;
2048 * Returns true if the currently-highlighted series was locked
2049 * via setSelection(..., seriesName, true).
2051 Dygraph
.prototype.isSeriesLocked
= function() {
2052 return this.lockedSet_
;
2056 * Fires when there's data available to be graphed.
2057 * @param {String} data Raw CSV data to be plotted
2060 Dygraph
.prototype.loadedEvent_
= function(data
) {
2061 this.rawData_
= this.parseCSV_(data
);
2066 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2069 Dygraph
.prototype.addXTicks_
= function() {
2070 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2072 if (this.dateWindow_
) {
2073 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2075 range
= this.fullXRange_();
2078 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2079 var xTicks
= xAxisOptionsView('ticker')(
2082 this.width_
, // TODO(danvk): should be area.width
2085 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2086 // console.log(msg);
2087 this.layout_
.setXTicks(xTicks
);
2092 * Computes the range of the data series (including confidence intervals).
2093 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2094 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2095 * @return [low, high]
2097 Dygraph
.prototype.extremeValues_
= function(series
) {
2098 var minY
= null, maxY
= null, j
, y
;
2100 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2102 // With custom bars, maxY is the max of the high values.
2103 for (j
= 0; j
< series
.length
; j
++) {
2104 y
= series
[j
][1][0];
2105 if (y
=== null || isNaN(y
)) continue;
2106 var low
= y
- series
[j
][1][1];
2107 var high
= y
+ series
[j
][1][2];
2108 if (low
> y
) low
= y
; // this can happen with custom bars,
2109 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2110 if (maxY
=== null || high
> maxY
) {
2113 if (minY
=== null || low
< minY
) {
2118 for (j
= 0; j
< series
.length
; j
++) {
2120 if (y
=== null || isNaN(y
)) continue;
2121 if (maxY
=== null || y
> maxY
) {
2124 if (minY
=== null || y
< minY
) {
2130 return [minY
, maxY
];
2135 * This function is called once when the chart's data is changed or the options
2136 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2137 * idea is that values derived from the chart's data can be computed here,
2138 * rather than every time the chart is drawn. This includes things like the
2139 * number of axes, rolling averages, etc.
2141 Dygraph
.prototype.predraw_
= function() {
2142 var start
= new Date();
2144 this.layout_
.computePlotArea();
2146 // TODO(danvk): move more computations out of drawGraph_ and into here.
2147 this.computeYAxes_();
2149 // Create a new plotter.
2150 if (this.plotter_
) {
2151 this.cascadeEvents_('clearChart');
2152 this.plotter_
.clear();
2154 this.plotter_
= new DygraphCanvasRenderer(this,
2159 // The roller sits in the bottom left corner of the chart. We don't know where
2160 // this will be until the options are available, so it's positioned here.
2161 this.createRollInterface_();
2163 this.cascadeEvents_('predraw');
2165 // Convert the raw data (a 2D array) into the internal format and compute
2166 // rolling averages.
2167 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2168 for (var i
= 1; i
< this.numColumns(); i
++) {
2169 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2170 var logScale
= this.attr_('logscale');
2171 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2172 series
= this.rollingAverage(series
, this.rollPeriod_
);
2173 this.rolledSeries_
.push(series
);
2176 // If the data or options have changed, then we'd better redraw.
2179 // This is used to determine whether to do various animations.
2180 var end
= new Date();
2181 this.drawingTimeMs_
= (end
- start
);
2185 * Loop over all fields and create datasets, calculating extreme y-values for
2186 * each series and extreme x-indices as we go.
2188 * dateWindow is passed in as an explicit parameter so that we can compute
2189 * extreme values "speculatively", i.e. without actually setting state on the
2192 * TODO(danvk): make this more of a true function
2193 * @return [ datasets, seriesExtremes, boundaryIds ]
2196 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2197 var boundaryIds
= [];
2198 var cumulative_y
= []; // For stacked series.
2200 var extremes
= {}; // series name -> [low, high]
2203 // Loop over the fields (series). Go from the last to the first,
2204 // because if they're stacked that's how we accumulate the values.
2205 var num_series
= rolledSeries
.length
- 1;
2206 for (i
= num_series
; i
>= 1; i
--) {
2207 if (!this.visibility()[i
- 1]) continue;
2209 // Note: this copy _is_ necessary at the moment.
2210 // If you remove it, it breaks zooming with error bars on.
2211 // TODO(danvk): investigate further & write a test for this.
2213 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2214 series
.push(rolledSeries
[i
][j
]);
2217 // Prune down to the desired range, if necessary (for zooming)
2218 // Because there can be lines going to points outside of the visible area,
2219 // we actually prune to visible points, plus one on either side.
2220 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2222 var low
= dateWindow
[0];
2223 var high
= dateWindow
[1];
2225 // TODO(danvk): do binary search instead of linear search.
2226 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2227 var firstIdx
= null, lastIdx
= null;
2228 for (k
= 0; k
< series
.length
; k
++) {
2229 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2232 if (series
[k
][0] <= high
) {
2236 if (firstIdx
=== null) firstIdx
= 0;
2237 if (firstIdx
> 0) firstIdx
--;
2238 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2239 if (lastIdx
< series
.length
- 1) lastIdx
++;
2240 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2241 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2242 pruned
.push(series
[k
]);
2246 boundaryIds
[i
-1] = [0, series
.length
-1];
2249 var seriesExtremes
= this.extremeValues_(series
);
2252 for (j
=0; j
<series
.length
; j
++) {
2253 series
[j
] = [series
[j
][0],
2258 } else if (this.attr_("stackedGraph")) {
2259 var l
= series
.length
;
2261 for (j
= 0; j
< l
; j
++) {
2262 // If one data set has a NaN, let all subsequent stacked
2263 // sets inherit the NaN -- only start at 0 for the first set.
2264 var x
= series
[j
][0];
2265 if (cumulative_y
[x
] === undefined
) {
2266 cumulative_y
[x
] = 0;
2269 actual_y
= series
[j
][1];
2270 if (actual_y
=== null) {
2271 series
[j
] = [x
, null];
2275 cumulative_y
[x
] += actual_y
;
2277 series
[j
] = [x
, cumulative_y
[x
]];
2279 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2280 seriesExtremes
[1] = cumulative_y
[x
];
2282 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2283 seriesExtremes
[0] = cumulative_y
[x
];
2288 var seriesName
= this.attr_("labels")[i
];
2289 extremes
[seriesName
] = seriesExtremes
;
2290 datasets
[i
] = series
;
2293 // For stacked graphs, a NaN value for any point in the sum should create a
2294 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2295 if (this.attr_("stackedGraph")) {
2296 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2297 // Use the first nonempty dataset to get X values.
2298 if (!datasets
[k
]) continue;
2299 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2300 var x
= datasets
[k
][j
][0];
2301 if (isNaN(cumulative_y
[x
])) {
2302 // Set all Y values to NaN at that X value.
2303 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2304 if (!datasets
[i
]) continue;
2305 datasets
[i
][j
][1] = NaN
;
2313 return [ datasets
, extremes
, boundaryIds
];
2317 * Update the graph with new data. This method is called when the viewing area
2318 * has changed. If the underlying data or options have changed, predraw_ will
2319 * be called before drawGraph_ is called.
2323 Dygraph
.prototype.drawGraph_
= function() {
2324 var start
= new Date();
2326 // This is used to set the second parameter to drawCallback, below.
2327 var is_initial_draw
= this.is_initial_draw_
;
2328 this.is_initial_draw_
= false;
2330 this.layout_
.removeAllDatasets();
2332 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2334 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2335 var datasets
= packed
[0];
2336 var extremes
= packed
[1];
2337 this.boundaryIds_
= packed
[2];
2339 this.setIndexByName_
= {};
2340 var labels
= this.attr_("labels");
2341 if (labels
.length
> 0) {
2342 this.setIndexByName_
[labels
[0]] = 0;
2345 for (var i
= 1; i
< datasets
.length
; i
++) {
2346 this.setIndexByName_
[labels
[i
]] = i
;
2347 if (!this.visibility()[i
- 1]) continue;
2348 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2349 this.datasetIndex_
[i
] = dataIdx
++;
2352 this.computeYAxisRanges_(extremes
);
2353 this.layout_
.setYAxes(this.axes_
);
2357 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2358 var tmp_zoomed_x
= this.zoomed_x_
;
2359 // Tell PlotKit to use this new data and render itself
2360 this.layout_
.setDateWindow(this.dateWindow_
);
2361 this.zoomed_x_
= tmp_zoomed_x
;
2362 this.layout_
.evaluateWithError();
2363 this.renderGraph_(is_initial_draw
);
2365 if (this.attr_("timingName")) {
2366 var end
= new Date();
2367 Dygraph
.info(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2372 * This does the work of drawing the chart. It assumes that the layout and axis
2373 * scales have already been set (e.g. by predraw_).
2377 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2378 this.cascadeEvents_('clearChart');
2379 this.plotter_
.clear();
2381 if (this.attr_('underlayCallback')) {
2382 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2383 // users who expect a deprecated form of this callback.
2384 this.attr_('underlayCallback')(
2385 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2389 canvas
: this.hidden_
,
2390 drawingContext
: this.hidden_ctx_
2392 this.cascadeEvents_('willDrawChart', e
);
2393 this.plotter_
.render();
2394 this.cascadeEvents_('didDrawChart', e
);
2396 // TODO(danvk): is this a performance bottleneck when panning?
2397 // The interaction canvas should already be empty in that situation.
2398 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2399 this.canvas_
.height
);
2401 if (this.attr_("drawCallback") !== null) {
2402 this.attr_("drawCallback")(this, is_initial_draw
);
2408 * Determine properties of the y-axes which are independent of the data
2409 * currently being displayed. This includes things like the number of axes and
2410 * the style of the axes. It does not include the range of each axis and its
2412 * This fills in this.axes_.
2413 * axes_ = [ { options } ]
2414 * indices are into the axes_ array.
2416 Dygraph
.prototype.computeYAxes_
= function() {
2417 // Preserve valueWindow settings if they exist, and if the user hasn't
2418 // specified a new valueRange.
2419 var valueWindows
, axis
, index
, opts
, v
;
2420 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2422 for (index
= 0; index
< this.axes_
.length
; index
++) {
2423 valueWindows
.push(this.axes_
[index
].valueWindow
);
2427 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2428 // data computation as well as options storage.
2429 // Go through once and add all the axes.
2432 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2433 // Add a new axis, making a copy of its per-axis options.
2434 opts
= { g
: this };
2435 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2436 this.axes_
[axis
] = opts
;
2440 // Copy global valueRange option over to the first axis.
2441 // NOTE(konigsberg): Are these two statements necessary?
2442 // I tried removing it. The automated tests pass, and manually
2443 // messing with tests/zoom
.html showed no trouble
.
2444 v
= this.attr_('valueRange');
2445 if (v
) this.axes_
[0].valueRange
= v
;
2447 if (valueWindows
!== undefined
) {
2448 // Restore valueWindow settings.
2449 for (index
= 0; index
< valueWindows
.length
; index
++) {
2450 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2454 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2456 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2457 v
= opts("valueRange");
2458 if (v
) this.axes_
[axis
].valueRange
= v
;
2459 } else { // To keep old behavior
2460 var axes
= this.user_attrs_
.axes
;
2461 if (axes
&& axes
.y2
) {
2462 v
= axes
.y2
.valueRange
;
2463 if (v
) this.axes_
[axis
].valueRange
= v
;
2470 * Returns the number of y-axes on the chart.
2471 * @return {Number} the number of axes.
2473 Dygraph
.prototype.numAxes
= function() {
2474 return this.attributes_
.numAxes();
2479 * Returns axis properties for the given series.
2480 * @param { String } setName The name of the series for which to get axis
2481 * properties, e.g. 'Y1'.
2482 * @return { Object } The axis properties.
2484 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2485 // TODO(danvk): handle errors.
2486 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2491 * Determine the value range and tick marks for each axis.
2492 * @param {Object} extremes A mapping from seriesName -> [low, high]
2493 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2495 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2497 var numAxes
= this.attributes_
.numAxes();
2499 // Compute extreme values, a span and tick marks for each axis.
2500 for (var i
= 0; i
< numAxes
; i
++) {
2501 var axis
= this.axes_
[i
];
2502 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2503 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2504 series
= this.attributes_
.seriesForAxis(i
);
2506 if (series
.length
=== 0) {
2507 // If no series are defined or visible then use a reasonable default
2508 axis
.extremeRange
= [0, 1];
2510 // Calculate the extremes of extremes.
2511 var minY
= Infinity
; // extremes[series[0]][0];
2512 var maxY
= -Infinity
; // extremes[series[0]][1];
2513 var extremeMinY
, extremeMaxY
;
2515 for (var j
= 0; j
< series
.length
; j
++) {
2516 // this skips invisible series
2517 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2519 // Only use valid extremes to stop null data series' from corrupting the scale.
2520 extremeMinY
= extremes
[series
[j
]][0];
2521 if (extremeMinY
!== null) {
2522 minY
= Math
.min(extremeMinY
, minY
);
2524 extremeMaxY
= extremes
[series
[j
]][1];
2525 if (extremeMaxY
!== null) {
2526 maxY
= Math
.max(extremeMaxY
, maxY
);
2529 if (includeZero
&& minY
> 0) minY
= 0;
2531 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2532 if (minY
== Infinity
) minY
= 0;
2533 if (maxY
== -Infinity
) maxY
= 1;
2535 // Add some padding and round up to an integer to be human-friendly.
2536 var span
= maxY
- minY
;
2537 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2538 if (span
=== 0) { span
= maxY
; }
2540 var maxAxisY
, minAxisY
;
2542 maxAxisY
= maxY
+ 0.1 * span
;
2545 maxAxisY
= maxY
+ 0.1 * span
;
2546 minAxisY
= minY
- 0.1 * span
;
2548 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2549 if (!this.attr_("avoidMinZero")) {
2550 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2551 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2554 if (this.attr_("includeZero")) {
2555 if (maxY
< 0) maxAxisY
= 0;
2556 if (minY
> 0) minAxisY
= 0;
2559 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2561 if (axis
.valueWindow
) {
2562 // This is only set if the user has zoomed on the y-axis. It is never set
2563 // by a user. It takes precedence over axis.valueRange because, if you set
2564 // valueRange, you'd still expect to be able to pan.
2565 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2566 } else if (axis
.valueRange
) {
2567 // This is a user-set value range for this axis.
2568 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2570 axis
.computedValueRange
= axis
.extremeRange
;
2573 // Add ticks. By default, all axes inherit the tick positions of the
2574 // primary axis. However, if an axis is specifically marked as having
2575 // independent ticks, then that is permissible as well.
2576 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2577 var ticker
= opts('ticker');
2578 if (i
=== 0 || axis
.independentTicks
) {
2579 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2580 axis
.computedValueRange
[1],
2581 this.height_
, // TODO(danvk): should be area.height
2585 var p_axis
= this.axes_
[0];
2586 var p_ticks
= p_axis
.ticks
;
2587 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2588 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2589 var tick_values
= [];
2590 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2591 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2592 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2593 tick_values
.push(y_val
);
2596 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2597 axis
.computedValueRange
[1],
2598 this.height_
, // TODO(danvk): should be area.height
2607 * Extracts one series from the raw data (a 2D array) into an array of (date,
2610 * This is where undesirable points (i.e. negative values on log scales and
2611 * missing values through which we wish to connect lines) are dropped.
2612 * TODO(danvk): the "missing values" bit above doesn't seem right.
2616 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2617 // TODO(danvk): pre-allocate series here.
2619 for (var j
= 0; j
< rawData
.length
; j
++) {
2620 var x
= rawData
[j
][0];
2621 var point
= rawData
[j
][i
];
2623 // On the log scale, points less than zero do not exist.
2624 // This will create a gap in the chart.
2629 series
.push([x
, point
]);
2636 * Calculates the rolling average of a data set.
2637 * If originalData is [label, val], rolls the average of those.
2638 * If originalData is [label, [, it's interpreted as [value, stddev]
2639 * and the roll is returned in the same form, with appropriately reduced
2640 * stddev for each value.
2641 * Note that this is where fractional input (i.e. '5/10') is converted into
2643 * @param {Array} originalData The data in the appropriate format (see above)
2644 * @param {Number} rollPeriod The number of points over which to average the
2647 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2648 if (originalData
.length
< 2)
2649 return originalData
;
2650 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2651 var rollingData
= [];
2652 var sigma
= this.attr_("sigma");
2654 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2655 if (this.fractions_
) {
2657 var den
= 0; // numerator/denominator
2659 for (i
= 0; i
< originalData
.length
; i
++) {
2660 num
+= originalData
[i
][1][0];
2661 den
+= originalData
[i
][1][1];
2662 if (i
- rollPeriod
>= 0) {
2663 num
-= originalData
[i
- rollPeriod
][1][0];
2664 den
-= originalData
[i
- rollPeriod
][1][1];
2667 var date
= originalData
[i
][0];
2668 var value
= den
? num
/ den
: 0.0;
2669 if (this.attr_("errorBars")) {
2670 if (this.attr_("wilsonInterval")) {
2671 // For more details on this confidence interval, see:
2672 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2674 var p
= value
< 0 ? 0 : value
, n
= den
;
2675 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2676 var denom
= 1 + sigma
* sigma
/ den
;
2677 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2678 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2679 rollingData
[i
] = [date
,
2680 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2682 rollingData
[i
] = [date
, [0, 0, 0]];
2685 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2686 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2689 rollingData
[i
] = [date
, mult
* value
];
2692 } else if (this.attr_("customBars")) {
2697 for (i
= 0; i
< originalData
.length
; i
++) {
2698 var data
= originalData
[i
][1];
2700 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2702 if (y
!== null && !isNaN(y
)) {
2708 if (i
- rollPeriod
>= 0) {
2709 var prev
= originalData
[i
- rollPeriod
];
2710 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2718 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2719 1.0 * (mid
- low
) / count
,
2720 1.0 * (high
- mid
) / count
]];
2722 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2726 // Calculate the rolling average for the first rollPeriod - 1 points where
2727 // there is not enough data to roll over the full number of points
2728 if (!this.attr_("errorBars")){
2729 if (rollPeriod
== 1) {
2730 return originalData
;
2733 for (i
= 0; i
< originalData
.length
; i
++) {
2736 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2737 y
= originalData
[j
][1];
2738 if (y
=== null || isNaN(y
)) continue;
2740 sum
+= originalData
[j
][1];
2743 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2745 rollingData
[i
] = [originalData
[i
][0], null];
2750 for (i
= 0; i
< originalData
.length
; i
++) {
2754 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2755 y
= originalData
[j
][1][0];
2756 if (y
=== null || isNaN(y
)) continue;
2758 sum
+= originalData
[j
][1][0];
2759 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2762 stddev
= Math
.sqrt(variance
) / num_ok
;
2763 rollingData
[i
] = [originalData
[i
][0],
2764 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2766 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2776 * Detects the type of the str (date or numeric) and sets the various
2777 * formatting attributes in this.attrs_ based on this type.
2778 * @param {String} str An x value.
2781 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2783 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2784 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2785 str
.indexOf('/') >= 0 ||
2786 isNaN(parseFloat(str
))) {
2788 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2789 // TODO(danvk): remove support for this format.
2793 this.setXAxisOptions_(isDate
);
2796 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2798 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2799 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2800 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2801 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2803 /** @private (shut up, jsdoc!) */
2804 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2805 // TODO(danvk): use Dygraph.numberValueFormatter here?
2806 /** @private (shut up, jsdoc!) */
2807 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2808 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2809 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2814 * Parses the value as a floating point number. This is like the parseFloat()
2815 * built-in, but with a few differences:
2816 * - the empty string is parsed as null, rather than NaN.
2817 * - if the string cannot be parsed at all, an error is logged.
2818 * If the string can't be parsed, this method returns null.
2819 * @param {String} x The string to be parsed
2820 * @param {Number} opt_line_no The line number from which the string comes.
2821 * @param {String} opt_line The text of the line from which the string comes.
2825 // Parse the x as a float or return null if it's not a number.
2826 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2827 var val
= parseFloat(x
);
2828 if (!isNaN(val
)) return val
;
2830 // Try to figure out what happeend.
2831 // If the value is the empty string, parse it as null.
2832 if (/^ *$/.test(x
)) return null;
2834 // If it was actually "NaN", return it as NaN.
2835 if (/^ *nan *$/i.test(x
)) return NaN
;
2837 // Looks like a parsing error.
2838 var msg
= "Unable to parse '" + x
+ "' as a number";
2839 if (opt_line
!== null && opt_line_no
!== null) {
2840 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2849 * Parses a string in a special csv format. We expect a csv file where each
2850 * line is a date point, and the first field in each line is the date string.
2851 * We also expect that all remaining fields represent series.
2852 * if the errorBars attribute is set, then interpret the fields as:
2853 * date, series1, stddev1, series2, stddev2, ...
2854 * @param {[Object]} data See above.
2856 * @return [Object] An array with one entry for each row. These entries
2857 * are an array of cells in that row. The first entry is the parsed x-value for
2858 * the row. The second, third, etc. are the y-values. These can take on one of
2859 * three forms, depending on the CSV and constructor parameters:
2861 * 2. [ value, stddev ]
2862 * 3. [ low value, center value, high value ]
2864 Dygraph
.prototype.parseCSV_
= function(data
) {
2866 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2867 var lines
= data
.split(line_delimiter
|| "\n");
2870 // Use the default delimiter or fall back to a tab if that makes sense.
2871 var delim
= this.attr_('delimiter');
2872 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2877 if (!('labels' in this.user_attrs_
)) {
2878 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2880 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2881 this.attributes_
.reparseSeries();
2886 var defaultParserSet
= false; // attempt to auto-detect x value type
2887 var expectedCols
= this.attr_("labels").length
;
2888 var outOfOrder
= false;
2889 for (var i
= start
; i
< lines
.length
; i
++) {
2890 var line
= lines
[i
];
2892 if (line
.length
=== 0) continue; // skip blank lines
2893 if (line
[0] == '#') continue; // skip comment lines
2894 var inFields
= line
.split(delim
);
2895 if (inFields
.length
< 2) continue;
2898 if (!defaultParserSet
) {
2899 this.detectTypeFromString_(inFields
[0]);
2900 xParser
= this.attr_("xValueParser");
2901 defaultParserSet
= true;
2903 fields
[0] = xParser(inFields
[0], this);
2905 // If fractions are expected, parse the numbers as "A/B
"
2906 if (this.fractions_) {
2907 for (j = 1; j < inFields.length; j++) {
2908 // TODO(danvk): figure out an appropriate way to flag parse errors.
2909 vals = inFields[j].split("/");
2910 if (vals.length != 2) {
2911 this.error('Expected fractional "num
/den
" values in CSV data ' +
2912 "but found a value
'" + inFields[j] + "' on line
" +
2913 (1 + i) + " ('" + line + "') which is not of
this form
.");
2916 fields[j] = [this.parseFloat_(vals[0], i, line),
2917 this.parseFloat_(vals[1], i, line)];
2920 } else if (this.attr_("errorBars
")) {
2921 // If there are error bars, values are (value, stddev) pairs
2922 if (inFields.length % 2 != 1) {
2923 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2924 'but line ' + (1 + i) + ' has an odd number of values (' +
2925 (inFields.length - 1) + "): '" + line + "'");
2927 for (j = 1; j < inFields.length; j += 2) {
2928 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2929 this.parseFloat_(inFields[j + 1], i, line)];
2931 } else if (this.attr_("customBars
")) {
2932 // Bars are a low;center;high tuple
2933 for (j = 1; j < inFields.length; j++) {
2934 var val = inFields[j];
2935 if (/^ *$/.test(val)) {
2936 fields[j] = [null, null, null];
2938 vals = val.split(";");
2939 if (vals.length == 3) {
2940 fields[j] = [ this.parseFloat_(vals[0], i, line),
2941 this.parseFloat_(vals[1], i, line),
2942 this.parseFloat_(vals[2], i, line) ];
2944 this.warn('When using customBars, values must be either blank ' +
2945 'or "low
;center
;high
" tuples (got "' + val +
2946 '" on line ' + (1+i));
2951 // Values are just numbers
2952 for (j = 1; j < inFields.length; j++) {
2953 fields[j] = this.parseFloat_(inFields[j], i, line);
2956 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2960 if (fields.length != expectedCols) {
2961 this.error("Number of columns
in line
" + i + " (" + fields.length +
2962 ") does not agree
with number of
labels (" + expectedCols +
2966 // If the user specified the 'labels' option and none of the cells of the
2967 // first row parsed correctly, then they probably double-specified the
2968 // labels. We go with the values set in the option, discard this row and
2969 // log a warning to the JS console.
2970 if (i === 0 && this.attr_('labels')) {
2971 var all_null = true;
2972 for (j = 0; all_null && j < fields.length; j++) {
2973 if (fields[j]) all_null = false;
2976 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2977 "CSV
data ('" + line + "') appears to also contain labels
. " +
2978 "Will drop the CSV labels and
use the option labels
.");
2986 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2987 ret.sort(function(a,b) { return a[0] - b[0]; });
2995 * The user has provided their data as a pre-packaged JS array. If the x values
2996 * are numeric, this is the same as dygraphs' internal format. If the x values
2997 * are dates, we need to convert them from Date objects to ms since epoch.
2998 * @param {[Object]} data
2999 * @return {[Object]} data with numeric x values.
3001 Dygraph.prototype.parseArray_ = function(data) {
3002 // Peek at the first x value to see if it's numeric.
3003 if (data.length === 0) {
3004 this.error("Can
't plot empty data set");
3007 if (data[0].length === 0) {
3008 this.error("Data set cannot contain an empty row");
3013 if (this.attr_("labels") === null) {
3014 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3015 "in the options parameter");
3016 this.attrs_.labels = [ "X" ];
3017 for (i = 1; i < data[0].length; i++) {
3018 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3020 this.attributes_.reparseSeries();
3022 var num_labels = this.attr_("labels");
3023 if (num_labels.length != data[0].length) {
3024 this.error("Mismatch between number of labels (" + num_labels +
3025 ") and number of columns in array (" + data[0].length + ")");
3030 if (Dygraph.isDateLike(data[0][0])) {
3031 // Some intelligent defaults for a date x-axis.
3032 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3033 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3034 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3036 // Assume they're all dates
.
3037 var parsedData
= Dygraph
.clone(data
);
3038 for (i
= 0; i
< data
.length
; i
++) {
3039 if (parsedData
[i
].length
=== 0) {
3040 this.error("Row " + (1 + i
) + " of data is empty");
3043 if (parsedData
[i
][0] === null ||
3044 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3045 isNaN(parsedData
[i
][0].getTime())) {
3046 this.error("x value in row " + (1 + i
) + " is not a Date");
3049 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3053 // Some intelligent defaults for a numeric x-axis.
3054 /** @private (shut up, jsdoc!) */
3055 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3056 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3057 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3063 * Parses a DataTable object from gviz.
3064 * The data is expected to have a first column that is either a date or a
3065 * number. All subsequent columns must be numbers. If there is a clear mismatch
3066 * between this.xValueParser_ and the type of the first column, it will be
3067 * fixed. Fills out rawData_.
3068 * @param {[Object]} data See above.
3071 Dygraph
.prototype.parseDataTable_
= function(data
) {
3072 var shortTextForAnnotationNum
= function(num
) {
3073 // converts [0-9]+ [A-Z][a-z]*
3074 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3075 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3076 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3077 num
= Math
.floor(num
/ 26);
3079 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3080 num
= Math
.floor((num
- 1) / 26);
3085 var cols
= data
.getNumberOfColumns();
3086 var rows
= data
.getNumberOfRows();
3088 var indepType
= data
.getColumnType(0);
3089 if (indepType
== 'date' || indepType
== 'datetime') {
3090 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3091 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3092 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3093 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3094 } else if (indepType
== 'number') {
3095 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3096 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3097 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3098 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3100 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3101 "column 1 of DataTable input (Got '" + indepType
+ "')");
3105 // Array of the column indices which contain data (and not annotations).
3107 var annotationCols
= {}; // data index -> [annotation cols]
3108 var hasAnnotations
= false;
3110 for (i
= 1; i
< cols
; i
++) {
3111 var type
= data
.getColumnType(i
);
3112 if (type
== 'number') {
3114 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3115 // This is OK -- it's an annotation column.
3116 var dataIdx
= colIdx
[colIdx
.length
- 1];
3117 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3118 annotationCols
[dataIdx
] = [i
];
3120 annotationCols
[dataIdx
].push(i
);
3122 hasAnnotations
= true;
3124 this.error("Only 'number' is supported as a dependent type with Gviz." +
3125 " 'string' is only supported if displayAnnotations is true");
3129 // Read column labels
3130 // TODO(danvk): add support back for errorBars
3131 var labels
= [data
.getColumnLabel(0)];
3132 for (i
= 0; i
< colIdx
.length
; i
++) {
3133 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3134 if (this.attr_("errorBars")) i
+= 1;
3136 this.attrs_
.labels
= labels
;
3137 cols
= labels
.length
;
3140 var outOfOrder
= false;
3141 var annotations
= [];
3142 for (i
= 0; i
< rows
; i
++) {
3144 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3145 data
.getValue(i
, 0) === null) {
3146 this.warn("Ignoring row " + i
+
3147 " of DataTable because of undefined or null first column.");
3151 if (indepType
== 'date' || indepType
== 'datetime') {
3152 row
.push(data
.getValue(i
, 0).getTime());
3154 row
.push(data
.getValue(i
, 0));
3156 if (!this.attr_("errorBars")) {
3157 for (j
= 0; j
< colIdx
.length
; j
++) {
3158 var col
= colIdx
[j
];
3159 row
.push(data
.getValue(i
, col
));
3160 if (hasAnnotations
&&
3161 annotationCols
.hasOwnProperty(col
) &&
3162 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3164 ann
.series
= data
.getColumnLabel(col
);
3166 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3168 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3169 if (k
) ann
.text
+= "\n";
3170 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3172 annotations
.push(ann
);
3176 // Strip out infinities, which give dygraphs problems later on.
3177 for (j
= 0; j
< row
.length
; j
++) {
3178 if (!isFinite(row
[j
])) row
[j
] = null;
3181 for (j
= 0; j
< cols
- 1; j
++) {
3182 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3185 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3192 this.warn("DataTable is out of order; order it correctly to speed loading.");
3193 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3195 this.rawData_
= ret
;
3197 if (annotations
.length
> 0) {
3198 this.setAnnotations(annotations
, true);
3200 this.attributes_
.reparseSeries();
3204 * Get the CSV data. If it's in a function, call that function. If it's in a
3205 * file, do an XMLHttpRequest to get it.
3208 Dygraph
.prototype.start_
= function() {
3209 var data
= this.file_
;
3211 // Functions can return references of all other types.
3212 if (typeof data
== 'function') {
3216 if (Dygraph
.isArrayLike(data
)) {
3217 this.rawData_
= this.parseArray_(data
);
3219 } else if (typeof data
== 'object' &&
3220 typeof data
.getColumnRange
== 'function') {
3221 // must be a DataTable from gviz.
3222 this.parseDataTable_(data
);
3224 } else if (typeof data
== 'string') {
3225 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3226 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3227 if (line_delimiter
) {
3228 this.loadedEvent_(data
);
3230 var req
= new XMLHttpRequest();
3232 req
.onreadystatechange
= function () {
3233 if (req
.readyState
== 4) {
3234 if (req
.status
=== 200 || // Normal http
3235 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3236 caller
.loadedEvent_(req
.responseText
);
3241 req
.open("GET", data
, true);
3245 this.error("Unknown data format: " + (typeof data
));
3250 * Changes various properties of the graph. These can include:
3252 * <li>file: changes the source data for the graph</li>
3253 * <li>errorBars: changes whether the data contains stddev</li>
3256 * There's a huge variety of options that can be passed to this method. For a
3257 * full list, see http://dygraphs.com/options.html.
3259 * @param {Object} attrs The new properties and values
3260 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3261 * call to updateOptions(). If you know better, you can pass true to explicitly
3262 * block the redraw. This can be useful for chaining updateOptions() calls,
3263 * avoiding the occasional infinite loop and preventing redraws when it's not
3264 * necessary (e.g. when updating a callback).
3266 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3267 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3269 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3270 var file
= input_attrs
.file
;
3271 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3273 // TODO(danvk): this is a mess. Move these options into attr_.
3274 if ('rollPeriod' in attrs
) {
3275 this.rollPeriod_
= attrs
.rollPeriod
;
3277 if ('dateWindow' in attrs
) {
3278 this.dateWindow_
= attrs
.dateWindow
;
3279 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3280 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3283 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3284 this.zoomed_y_
= (attrs
.valueRange
!== null);
3287 // TODO(danvk): validate per-series options.
3292 // highlightCircleSize
3294 // Check if this set options will require new points.
3295 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3297 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3299 this.attributes_
.reparseSeries();
3303 if (!block_redraw
) this.start_();
3305 if (!block_redraw
) {
3306 if (requiresNewPoints
) {
3309 this.renderGraph_(false);
3316 * Returns a copy of the options with deprecated names converted into current
3317 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3318 * interested in that, they should save a copy before calling this.
3321 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3323 for (var k
in attrs
) {
3324 if (k
== 'file') continue;
3325 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3328 var set
= function(axis
, opt
, value
) {
3329 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3330 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3331 my_attrs
.axes
[axis
][opt
] = value
;
3333 var map
= function(opt
, axis
, new_opt
) {
3334 if (typeof(attrs
[opt
]) != 'undefined') {
3335 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3336 new_opt
+ " option for the " + axis
+ " axis instead. " +
3337 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3338 "(see http://dygraphs.com/per-axis.html for more information.");
3339 set(axis
, new_opt
, attrs
[opt
]);
3340 delete my_attrs
[opt
];
3344 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3345 map('xValueFormatter', 'x', 'valueFormatter');
3346 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3347 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3348 map('xTicker', 'x', 'ticker');
3349 map('yValueFormatter', 'y', 'valueFormatter');
3350 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3351 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3352 map('yTicker', 'y', 'ticker');
3357 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3358 * containing div (which has presumably changed size since the dygraph was
3359 * instantiated. If the width/height are specified, the div will be resized.
3361 * This is far more efficient than destroying and re-instantiating a
3362 * Dygraph, since it doesn't have to reparse the underlying data.
3364 * @param {Number} [width] Width (in pixels)
3365 * @param {Number} [height] Height (in pixels)
3367 Dygraph
.prototype.resize
= function(width
, height
) {
3368 if (this.resize_lock
) {
3371 this.resize_lock
= true;
3373 if ((width
=== null) != (height
=== null)) {
3374 this.warn("Dygraph.resize() should be called with zero parameters or " +
3375 "two non-NULL parameters. Pretending it was zero.");
3376 width
= height
= null;
3379 var old_width
= this.width_
;
3380 var old_height
= this.height_
;
3383 this.maindiv_
.style
.width
= width
+ "px";
3384 this.maindiv_
.style
.height
= height
+ "px";
3385 this.width_
= width
;
3386 this.height_
= height
;
3388 this.width_
= this.maindiv_
.clientWidth
;
3389 this.height_
= this.maindiv_
.clientHeight
;
3392 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3393 // TODO(danvk): there should be a clear() method.
3394 this.maindiv_
.innerHTML
= "";
3395 this.roller_
= null;
3396 this.attrs_
.labelsDiv
= null;
3397 this.createInterface_();
3398 if (this.annotations_
.length
) {
3399 // createInterface_ reset the layout, so we need to do this.
3400 this.layout_
.setAnnotations(this.annotations_
);
3402 this.createDragInterface_();
3406 this.resize_lock
= false;
3410 * Adjusts the number of points in the rolling average. Updates the graph to
3411 * reflect the new averaging period.
3412 * @param {Number} length Number of points over which to average the data.
3414 Dygraph
.prototype.adjustRoll
= function(length
) {
3415 this.rollPeriod_
= length
;
3420 * Returns a boolean array of visibility statuses.
3422 Dygraph
.prototype.visibility
= function() {
3423 // Do lazy-initialization, so that this happens after we know the number of
3425 if (!this.attr_("visibility")) {
3426 this.attrs_
.visibility
= [];
3428 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3429 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3430 this.attrs_
.visibility
.push(true);
3432 return this.attr_("visibility");
3436 * Changes the visiblity of a series.
3438 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3439 var x
= this.visibility();
3440 if (num
< 0 || num
>= x
.length
) {
3441 this.warn("invalid series number in setVisibility: " + num
);
3449 * How large of an area will the dygraph render itself in?
3450 * This is used for testing.
3451 * @return A {width: w, height: h} object.
3454 Dygraph
.prototype.size
= function() {
3455 return { width
: this.width_
, height
: this.height_
};
3459 * Update the list of annotations and redraw the chart.
3460 * See dygraphs.com/annotations.html for more info on how to use annotations.
3461 * @param ann {Array} An array of annotation objects.
3462 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3464 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3465 // Only add the annotation CSS rule once we know it will be used.
3466 Dygraph
.addAnnotationRule();
3467 this.annotations_
= ann
;
3468 this.layout_
.setAnnotations(this.annotations_
);
3469 if (!suppressDraw
) {
3475 * Return the list of annotations.
3477 Dygraph
.prototype.annotations
= function() {
3478 return this.annotations_
;
3482 * Get the list of label names for this graph. The first column is the
3483 * x-axis, so the data series names start at index 1.
3485 Dygraph
.prototype.getLabels
= function() {
3486 return this.attr_("labels").slice();
3490 * Get the index of a series (column) given its name. The first column is the
3491 * x-axis, so the data series start with index 1.
3493 Dygraph
.prototype.indexFromSetName
= function(name
) {
3494 return this.setIndexByName_
[name
];
3498 * Get the internal dataset index given its name. These are numbered starting from 0,
3499 * and only count visible sets.
3502 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3503 return this.datasetIndex_
[this.indexFromSetName(name
)];
3508 * Adds a default style for the annotation CSS classes to the document. This is
3509 * only executed when annotations are actually used. It is designed to only be
3510 * called once -- all calls after the first will return immediately.
3512 Dygraph
.addAnnotationRule
= function() {
3513 // TODO(danvk): move this function into plugins/annotations.js
?
3514 if (Dygraph
.addedAnnotationCSS
) return;
3516 var rule
= "border: 1px solid black; " +
3517 "background-color: white; " +
3518 "text-align: center;";
3520 var styleSheetElement
= document
.createElement("style");
3521 styleSheetElement
.type
= "text/css";
3522 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3524 // Find the first style sheet that we can access.
3525 // We may not add a rule to a style sheet from another domain for security
3526 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3527 // adds its own style sheets from google.com.
3528 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3529 if (document
.styleSheets
[i
].disabled
) continue;
3530 var mysheet
= document
.styleSheets
[i
];
3532 if (mysheet
.insertRule
) { // Firefox
3533 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3534 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3535 } else if (mysheet
.addRule
) { // IE
3536 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3538 Dygraph
.addedAnnotationCSS
= true;
3541 // Was likely a security exception.
3545 this.warn("Unable to add default annotation CSS rule; display may be off.");
3548 // Older pages may still use this name.
3549 var DateGraph
= Dygraph
;