3 * Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
8 * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
9 * string. Dygraph can handle multiple series with or without error bars. The
10 * date/value ranges will be automatically set. Dygraph uses the
11 * <canvas> tag, so it only works in FF1.5+.
12 * @author danvdk@gmail.com (Dan Vanderkam)
15 <div id="graphdiv" style="width:800px; height:500px;"></div>
16 <script type="text/javascript">
17 new Dygraph(document.getElementById("graphdiv"),
18 "datafile.csv", // CSV file with headers
22 The CSV file is of the form
24 Date,SeriesA,SeriesB,SeriesC
28 If the 'errorBars' option is set in the constructor, the input should be of
30 Date,SeriesA,SeriesB,...
31 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
32 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
34 If the 'fractions' option is set, the input should be of the form:
36 Date,SeriesA,SeriesB,...
37 YYYYMMDD,A1/B1,A2/B2,...
38 YYYYMMDD,A1/B1,A2/B2,...
40 And error bars will be calculated automatically using a binomial distribution.
42 For further documentation and examples, see http://dygraphs.com/
46 /*jshint globalstrict: true */
47 /*global DygraphLayout:false, DygraphCanvasRenderer:false, DygraphOptions:false, G_vmlCanvasManager:false */
51 * Creates an interactive, zoomable chart.
54 * @param {div | String} div A div or the id of a div into which to construct
56 * @param {String | Function} file A file containing CSV data or a function
57 * that returns this data. The most basic expected format for each line is
58 * "YYYY/MM/DD,val1,val2,...". For more information, see
59 * http://dygraphs.com/data.html.
60 * @param {Object} attrs Various other attributes, e.g. errorBars determines
61 * whether the input data contains error ranges. For a complete list of
62 * options, see http://dygraphs.com/options.html.
64 var Dygraph
= function(div
, data
, opts
, opt_fourth_param
) {
65 if (opt_fourth_param
!== undefined
) {
66 // Old versions of dygraphs took in the series labels as a constructor
67 // parameter. This doesn't make sense anymore, but it's easy to continue
68 // to support this usage.
69 this.warn("Using deprecated four-argument dygraph constructor");
70 this.__old_init__(div
, data
, opts
, opt_fourth_param
);
72 this.__init__(div
, data
, opts
);
76 Dygraph
.NAME
= "Dygraph";
77 Dygraph
.VERSION
= "1.2";
78 Dygraph
.__repr__
= function() {
79 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
83 * Returns information about the Dygraph class.
85 Dygraph
.toString
= function() {
86 return this.__repr__();
89 // Various default values
90 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
91 Dygraph
.DEFAULT_WIDTH
= 480;
92 Dygraph
.DEFAULT_HEIGHT
= 320;
94 // For max 60 Hz. animation:
95 Dygraph
.ANIMATION_STEPS
= 12;
96 Dygraph
.ANIMATION_DURATION
= 200;
98 // These are defined before DEFAULT_ATTRS so that it can refer to them.
101 * Return a string version of a number. This respects the digitsAfterDecimal
102 * and maxNumberWidth options.
103 * @param {Number} x The number to be formatted
104 * @param {Dygraph} opts An options view
105 * @param {String} name The name of the point's data series
106 * @param {Dygraph} g The dygraph object
108 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
109 var sigFigs
= opts('sigFigs');
111 if (sigFigs
!== null) {
112 // User has opted for a fixed number of significant figures.
113 return Dygraph
.floatFormat(x
, sigFigs
);
116 var digits
= opts('digitsAfterDecimal');
117 var maxNumberWidth
= opts('maxNumberWidth');
119 // switch to scientific notation if we underflow or overflow fixed display.
121 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
122 Math
.abs(x
) < Math
.pow(10, -digits
))) {
123 return x
.toExponential(digits
);
125 return '' + Dygraph
.round_(x
, digits
);
130 * variant for use as an axisLabelFormatter.
133 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
134 return Dygraph
.numberValueFormatter(x
, opts
, g
);
138 * Convert a JS date (millis since epoch) to YYYY/MM/DD
139 * @param {Number} date The JavaScript date (ms since epoch)
140 * @return {String} A date of the form "YYYY/MM/DD"
143 Dygraph
.dateString_
= function(date
) {
144 var zeropad
= Dygraph
.zeropad
;
145 var d
= new Date(date
);
148 var year
= "" + d
.getFullYear();
149 // Get a 0 padded month string
150 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
151 // Get a 0 padded day string
152 var day
= zeropad(d
.getDate());
155 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
156 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
158 return year
+ "/" + month + "/" + day
+ ret
;
162 * Convert a JS date to a string appropriate to display on an axis that
163 * is displaying values at the stated granularity.
164 * @param {Date} date The date to format
165 * @param {Number} granularity One of the Dygraph granularity constants
166 * @return {String} The formatted date
169 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
170 if (granularity
>= Dygraph
.DECADAL
) {
171 return date
.strftime('%Y');
172 } else if (granularity
>= Dygraph
.MONTHLY
) {
173 return date
.strftime('%b %y');
175 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
176 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
177 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
179 return Dygraph
.hmsString_(date
.getTime());
185 * Standard plotters. These may be used by clients.
186 * Available plotters are:
187 * - Dygraph.Plotters.linePlotter: draws central lines (most common)
188 * - Dygraph.Plotters.errorPlotter: draws error bars
189 * - Dygraph.Plotters.fillPlotter: draws fills under lines (used with fillGraph)
191 * By default, the plotter is [fillPlotter, errorPlotter, linePlotter].
192 * This causes all the lines to be drawn over all the fills/error bars.
194 Dygraph
.Plotters
= DygraphCanvasRenderer
._Plotters
;
197 // Default attribute values.
198 Dygraph
.DEFAULT_ATTRS
= {
199 highlightCircleSize
: 3,
200 highlightSeriesOpts
: null,
201 highlightSeriesBackgroundAlpha
: 0.5,
205 // TODO(danvk): move defaults from createStatusMessage_ here.
207 labelsSeparateLines
: false,
208 labelsShowZeroValues
: true,
211 showLabelsOnHighlight
: true,
213 digitsAfterDecimal
: 2,
218 strokeBorderWidth
: 0,
219 strokeBorderColor
: "white",
222 axisLabelFontSize
: 14,
228 xValueParser
: Dygraph
.dateParser
,
235 wilsonInterval
: true, // only relevant if fractions is true
239 connectSeparatedPoints
: false,
242 hideOverlayOnMouseOut
: true,
244 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
245 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
249 drawAxesAtZero
: false,
251 // Sizes of the various chart labels.
258 axisLineColor
: "black",
261 axisLabelColor
: "black",
262 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
266 gridLineColor
: "rgb(128,128,128)",
268 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
269 animatedZooms
: false, // (for now)
271 // Range selector options
272 showRangeSelector
: false,
273 rangeSelectorHeight
: 40,
274 rangeSelectorPlotStrokeColor
: "#808FAB",
275 rangeSelectorPlotFillColor
: "#A7B1C4",
277 // The ordering here ensures that central lines always appear above any
278 // fill bars/error bars
.
280 Dygraph
.Plotters
.fillPlotter
,
281 Dygraph
.Plotters
.errorPlotter
,
282 Dygraph
.Plotters
.linePlotter
291 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
292 valueFormatter
: Dygraph
.dateString_
,
293 ticker
: null // will be set in dygraph-tickers.js
297 valueFormatter
: Dygraph
.numberValueFormatter
,
298 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
299 ticker
: null // will be set in dygraph-tickers.js
303 valueFormatter
: Dygraph
.numberValueFormatter
,
304 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
305 ticker
: null // will be set in dygraph-tickers.js
310 // Directions for panning and zooming. Use bit operations when combined
311 // values are possible.
312 Dygraph
.HORIZONTAL
= 1;
313 Dygraph
.VERTICAL
= 2;
315 // Installed plugins, in order of precedence (most-general to most-specific).
316 // Plugins are installed after they are defined, in plugins/install.js
.
320 // Used for initializing annotation CSS rules only once.
321 Dygraph
.addedAnnotationCSS
= false;
323 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
324 // Labels is no longer a constructor parameter, since it's typically set
325 // directly from the data source. It also conains a name for the x-axis,
326 // which the previous constructor form did not.
327 if (labels
!== null) {
328 var new_labels
= ["Date"];
329 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
330 Dygraph
.update(attrs
, { 'labels': new_labels
});
332 this.__init__(div
, file
, attrs
);
336 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
337 * and context <canvas> inside of it. See the constructor for details.
339 * @param {Element} div the Element to render the graph into.
340 * @param {String | Function} file Source data
341 * @param {Object} attrs Miscellaneous other options
344 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
345 // Hack for IE: if we're using excanvas and the document hasn't finished
346 // loading yet (and hence may not have initialized whatever it needs to
347 // initialize), then keep calling this routine periodically until it has.
348 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
349 typeof(G_vmlCanvasManager
) != 'undefined' &&
350 document
.readyState
!= 'complete') {
352 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
356 // Support two-argument constructor
357 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
359 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
361 if (typeof(div
) == 'string') {
362 div
= document
.getElementById(div
);
366 Dygraph
.error("Constructing dygraph with a non-existent div!");
370 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
372 // Copy the important bits into the object
373 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
376 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
377 this.previousVerticalX_
= -1;
378 this.fractions_
= attrs
.fractions
|| false;
379 this.dateWindow_
= attrs
.dateWindow
|| null;
381 this.is_initial_draw_
= true;
382 this.annotations_
= [];
384 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
385 this.zoomed_x_
= false;
386 this.zoomed_y_
= false;
388 // Clear the div. This ensure that, if multiple dygraphs are passed the same
389 // div, then only one will be drawn.
392 // For historical reasons, the 'width' and 'height' options trump all CSS
393 // rules _except_ for an explicit 'width' or 'height' on the div.
394 // As an added convenience, if the div has zero height (like <div></div> does
395 // without any styles), then we use a default height/width
.
396 if (div
.style
.width
=== '' && attrs
.width
) {
397 div
.style
.width
= attrs
.width
+ "px";
399 if (div
.style
.height
=== '' && attrs
.height
) {
400 div
.style
.height
= attrs
.height
+ "px";
402 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
403 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
404 if (div
.style
.width
=== '') {
405 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
408 // these will be zero if the dygraph's div is hidden.
409 this.width_
= div
.clientWidth
;
410 this.height_
= div
.clientHeight
;
412 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
413 if (attrs
.stackedGraph
) {
414 attrs
.fillGraph
= true;
415 // TODO(nikhilk): Add any other stackedGraph checks here.
418 // DEPRECATION WARNING: All option processing should be moved from
419 // attrs_ and user_attrs_ to options_, which holds all this information.
421 // Dygraphs has many options, some of which interact with one another.
422 // To keep track of everything, we maintain two sets of options:
424 // this.user_attrs_ only options explicitly set by the user.
425 // this.attrs_ defaults, options derived from user_attrs_, data.
427 // Options are then accessed this.attr_('attr'), which first looks at
428 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
429 // defaults without overriding behavior that the user specifically asks for.
430 this.user_attrs_
= {};
431 Dygraph
.update(this.user_attrs_
, attrs
);
433 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
435 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
437 this.boundaryIds_
= [];
438 this.setIndexByName_
= {};
439 this.datasetIndex_
= [];
441 this.registeredEvents_
= [];
442 this.eventListeners_
= {};
444 this.attributes_
= new DygraphOptions(this);
446 // Create the containing DIV and other interactive elements
447 this.createInterface_();
451 var plugins
= Dygraph
.PLUGINS
.concat(this.getOption('plugins'));
452 for (var i
= 0; i
< plugins
.length
; i
++) {
453 var Plugin
= plugins
[i
];
454 var pluginInstance
= new Plugin();
456 plugin
: pluginInstance
,
462 var handlers
= pluginInstance
.activate(this);
463 for (var eventName
in handlers
) {
464 // TODO(danvk): validate eventName.
465 pluginDict
.events
[eventName
] = handlers
[eventName
];
468 this.plugins_
.push(pluginDict
);
471 // At this point, plugins can no longer register event handlers.
472 // Construct a map from event -> ordered list of [callback, plugin].
473 for (var i
= 0; i
< this.plugins_
.length
; i
++) {
474 var plugin_dict
= this.plugins_
[i
];
475 for (var eventName
in plugin_dict
.events
) {
476 if (!plugin_dict
.events
.hasOwnProperty(eventName
)) continue;
477 var callback
= plugin_dict
.events
[eventName
];
479 var pair
= [plugin_dict
.plugin
, callback
];
480 if (!(eventName
in this.eventListeners_
)) {
481 this.eventListeners_
[eventName
] = [pair
];
483 this.eventListeners_
[eventName
].push(pair
);
488 this.createDragInterface_();
494 * Triggers a cascade of events to the various plugins which are interested in them.
495 * Returns true if the "default behavior" should be performed, i.e. if none of
496 * the event listeners called event.preventDefault().
499 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
500 if (!(name
in this.eventListeners_
)) return true;
502 // QUESTION: can we use objects & prototypes to speed this up?
506 defaultPrevented
: false,
507 preventDefault
: function() {
508 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
509 e
.defaultPrevented
= true;
511 propagationStopped
: false,
512 stopPropagation
: function() {
513 e
.propagationStopped
= true;
516 Dygraph
.update(e
, extra_props
);
518 var callback_plugin_pairs
= this.eventListeners_
[name
];
519 if (callback_plugin_pairs
) {
520 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
521 var plugin
= callback_plugin_pairs
[i
][0];
522 var callback
= callback_plugin_pairs
[i
][1];
523 callback
.call(plugin
, e
);
524 if (e
.propagationStopped
) break;
527 return e
.defaultPrevented
;
531 * Returns the zoomed status of the chart for one or both axes.
533 * Axis is an optional parameter. Can be set to 'x' or 'y'.
535 * The zoomed status for an axis is set whenever a user zooms using the mouse
536 * or when the dateWindow or valueRange are updated (unless the
537 * isZoomedIgnoreProgrammaticZoom option is also specified).
539 Dygraph
.prototype.isZoomed
= function(axis
) {
540 if (axis
=== null || axis
=== undefined
) {
541 return this.zoomed_x_
|| this.zoomed_y_
;
543 if (axis
=== 'x') return this.zoomed_x_
;
544 if (axis
=== 'y') return this.zoomed_y_
;
545 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
549 * Returns information about the Dygraph object, including its containing ID.
551 Dygraph
.prototype.toString
= function() {
552 var maindiv
= this.maindiv_
;
553 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
554 return "[Dygraph " + id
+ "]";
559 * Returns the value of an option. This may be set by the user (either in the
560 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
562 * @param { String } name The name of the option, e.g. 'rollPeriod'.
563 * @param { String } [seriesName] The name of the series to which the option
564 * will be applied. If no per-series value of this option is available, then
565 * the global value is returned. This is optional.
566 * @return { ... } The value of the option.
568 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
569 // <REMOVE_FOR_COMBINED>
570 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
571 this.error('Must include options reference JS for testing');
572 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
573 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
574 'in the Dygraphs.OPTIONS_REFERENCE listing.');
575 // Only log this error once.
576 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
578 // </REMOVE_FOR_COMBINED
>
579 return seriesName
? this.attributes_
.getForSeries(name
, seriesName
) : this.attributes_
.get(name
);
583 * Returns the current value for an option, as set in the constructor or via
584 * updateOptions. You may pass in an (optional) series name to get per-series
585 * values for the option.
587 * All values returned by this method should be considered immutable. If you
588 * modify them, there is no guarantee that the changes will be honored or that
589 * dygraphs will remain in a consistent state. If you want to modify an option,
590 * use updateOptions() instead.
592 * @param { String } name The name of the option (e.g. 'strokeWidth')
593 * @param { String } [opt_seriesName] Series name to get per-series values.
594 * @return { ... } The value of the option.
596 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
597 return this.attr_(name
, opt_seriesName
);
600 Dygraph
.prototype.getOptionForAxis
= function(name
, axis
) {
601 return this.attributes_
.getForAxis(name
, axis
);
606 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
607 * @return { ... } A function mapping string -> option value
609 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
611 return function(opt
) {
612 var axis_opts
= self
.user_attrs_
.axes
;
613 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
614 return axis_opts
[axis
][opt
];
616 // user-specified attributes always trump defaults, even if they're less
618 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
619 return self
.user_attrs_
[opt
];
622 axis_opts
= self
.attrs_
.axes
;
623 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
624 return axis_opts
[axis
][opt
];
626 // check old-style axis options
627 // TODO(danvk): add a deprecation warning if either of these match.
628 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
629 return self
.axes_
[0][opt
];
630 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
631 return self
.axes_
[1][opt
];
633 return self
.attr_(opt
);
638 * Returns the current rolling period, as set by the user or an option.
639 * @return {Number} The number of points in the rolling window
641 Dygraph
.prototype.rollPeriod
= function() {
642 return this.rollPeriod_
;
646 * Returns the currently-visible x-range. This can be affected by zooming,
647 * panning or a call to updateOptions.
648 * Returns a two-element array: [left, right].
649 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
651 Dygraph
.prototype.xAxisRange
= function() {
652 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
656 * Returns the lower- and upper-bound x-axis values of the
659 Dygraph
.prototype.xAxisExtremes
= function() {
660 var left
= this.rawData_
[0][0];
661 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
662 return [left
, right
];
666 * Returns the currently-visible y-range for an axis. This can be affected by
667 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
668 * called with no arguments, returns the range of the first axis.
669 * Returns a two-element array: [bottom, top].
671 Dygraph
.prototype.yAxisRange
= function(idx
) {
672 if (typeof(idx
) == "undefined") idx
= 0;
673 if (idx
< 0 || idx
>= this.axes_
.length
) {
676 var axis
= this.axes_
[idx
];
677 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
681 * Returns the currently-visible y-ranges for each axis. This can be affected by
682 * zooming, panning, calls to updateOptions, etc.
683 * Returns an array of [bottom, top] pairs, one for each y-axis.
685 Dygraph
.prototype.yAxisRanges
= function() {
687 for (var i
= 0; i
< this.axes_
.length
; i
++) {
688 ret
.push(this.yAxisRange(i
));
693 // TODO(danvk): use these functions throughout dygraphs.
695 * Convert from data coordinates to canvas/div X/Y coordinates.
696 * If specified, do this conversion for the coordinate system of a particular
697 * axis. Uses the first axis by default.
698 * Returns a two-element array: [X, Y]
700 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
701 * instead of toDomCoords(null, y, axis).
703 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
704 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
708 * Convert from data x coordinates to canvas/div X coordinate.
709 * If specified, do this conversion for the coordinate system of a particular
711 * Returns a single value or null if x is null.
713 Dygraph
.prototype.toDomXCoord
= function(x
) {
718 var area
= this.plotter_
.area
;
719 var xRange
= this.xAxisRange();
720 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
724 * Convert from data x coordinates to canvas/div Y coordinate and optional
725 * axis. Uses the first axis by default.
727 * returns a single value or null if y is null.
729 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
730 var pct
= this.toPercentYCoord(y
, axis
);
735 var area
= this.plotter_
.area
;
736 return area
.y
+ pct
* area
.h
;
740 * Convert from canvas/div coords to data coordinates.
741 * If specified, do this conversion for the coordinate system of a particular
742 * axis. Uses the first axis by default.
743 * Returns a two-element array: [X, Y].
745 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
746 * instead of toDataCoords(null, y, axis).
748 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
749 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
753 * Convert from canvas/div x coordinate to data coordinate.
755 * If x is null, this returns null.
757 Dygraph
.prototype.toDataXCoord
= function(x
) {
762 var area
= this.plotter_
.area
;
763 var xRange
= this.xAxisRange();
764 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
768 * Convert from canvas/div y coord to value.
770 * If y is null, this returns null.
771 * if axis is null, this uses the first axis.
773 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
778 var area
= this.plotter_
.area
;
779 var yRange
= this.yAxisRange(axis
);
781 if (typeof(axis
) == "undefined") axis
= 0;
782 if (!this.axes_
[axis
].logscale
) {
783 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
785 // Computing the inverse of toDomCoord.
786 var pct
= (y
- area
.y
) / area
.h
;
788 // Computing the inverse of toPercentYCoord. The function was arrived at with
789 // the following steps:
791 // Original calcuation:
792 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
794 // Move denominator to both sides:
795 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
797 // subtract logr1, and take the negative value.
798 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
800 // Swap both sides of the equation, and we can compute the log of the
801 // return value. Which means we just need to use that as the exponent in
803 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
805 var logr1
= Dygraph
.log10(yRange
[1]);
806 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
807 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
813 * Converts a y for an axis to a percentage from the top to the
814 * bottom of the drawing area.
816 * If the coordinate represents a value visible on the canvas, then
817 * the value will be between 0 and 1, where 0 is the top of the canvas.
818 * However, this method will return values outside the range, as
819 * values can fall outside the canvas.
821 * If y is null, this returns null.
822 * if axis is null, this uses the first axis.
824 * @param { Number } y The data y-coordinate.
825 * @param { Number } [axis] The axis number on which the data coordinate lives.
826 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
828 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
832 if (typeof(axis
) == "undefined") axis
= 0;
834 var yRange
= this.yAxisRange(axis
);
837 var logscale
= this.attributes_
.getForAxis("logscale", axis
);
839 // yRange[1] - y is unit distance from the bottom.
840 // yRange[1] - yRange[0] is the scale of the range.
841 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
842 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
844 var logr1
= Dygraph
.log10(yRange
[1]);
845 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
851 * Converts an x value to a percentage from the left to the right of
854 * If the coordinate represents a value visible on the canvas, then
855 * the value will be between 0 and 1, where 0 is the left of the canvas.
856 * However, this method will return values outside the range, as
857 * values can fall outside the canvas.
859 * If x is null, this returns null.
860 * @param { Number } x The data x-coordinate.
861 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
863 Dygraph
.prototype.toPercentXCoord
= function(x
) {
868 var xRange
= this.xAxisRange();
869 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
873 * Returns the number of columns (including the independent variable).
874 * @return { Integer } The number of columns.
876 Dygraph
.prototype.numColumns
= function() {
877 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
881 * Returns the number of rows (excluding any header/label row).
882 * @return { Integer } The number of rows, less any header.
884 Dygraph
.prototype.numRows
= function() {
885 return this.rawData_
.length
;
889 * Returns the full range of the x-axis, as determined by the most extreme
890 * values in the data set. Not affected by zooming, visibility, etc.
891 * TODO(danvk): merge w/ xAxisExtremes
892 * @return { Array<Number> } A [low, high] pair
895 Dygraph
.prototype.fullXRange_
= function() {
896 if (this.numRows() > 0) {
897 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
904 * Returns the value in the given row and column. If the row and column exceed
905 * the bounds on the data, returns null. Also returns null if the value is
907 * @param { Number} row The row number of the data (0-based). Row 0 is the
908 * first row of data, not a header row.
909 * @param { Number} col The column number of the data (0-based)
910 * @return { Number } The value in the specified cell or null if the row/col
913 Dygraph
.prototype.getValue
= function(row
, col
) {
914 if (row
< 0 || row
> this.rawData_
.length
) return null;
915 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
917 return this.rawData_
[row
][col
];
921 * Generates interface elements for the Dygraph: a containing div, a div to
922 * display the current point, and a textbox to adjust the rolling average
923 * period. Also creates the Renderer/Layout elements.
926 Dygraph
.prototype.createInterface_
= function() {
927 // Create the all-enclosing graph div
928 var enclosing
= this.maindiv_
;
930 this.graphDiv
= document
.createElement("div");
931 this.graphDiv
.style
.width
= this.width_
+ "px";
932 this.graphDiv
.style
.height
= this.height_
+ "px";
933 enclosing
.appendChild(this.graphDiv
);
935 // Create the canvas for interactive parts of the chart.
936 this.canvas_
= Dygraph
.createCanvas();
937 this.canvas_
.style
.position
= "absolute";
938 this.canvas_
.width
= this.width_
;
939 this.canvas_
.height
= this.height_
;
940 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
941 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
943 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
945 // ... and for static parts of the chart.
946 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
947 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
949 // The interactive parts of the graph are drawn on top of the chart.
950 this.graphDiv
.appendChild(this.hidden_
);
951 this.graphDiv
.appendChild(this.canvas_
);
952 this.mouseEventElement_
= this.createMouseEventElement_();
954 // Create the grapher
955 this.layout_
= new DygraphLayout(this);
959 this.mouseMoveHandler
= function(e
) {
960 dygraph
.mouseMove_(e
);
962 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
964 this.mouseOutHandler
= function(e
) {
965 dygraph
.mouseOut_(e
);
967 this.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
969 this.resizeHandler
= function(e
) {
973 // Update when the window is resized.
974 // TODO(danvk): drop frames depending on complexity of the chart.
975 this.addEvent(window
, 'resize', this.resizeHandler
);
979 * Detach DOM elements in the dygraph and null out all data references.
980 * Calling this when you're done with a dygraph can dramatically reduce memory
981 * usage. See, e.g., the tests/perf.html example.
983 Dygraph
.prototype.destroy
= function() {
984 var removeRecursive
= function(node
) {
985 while (node
.hasChildNodes()) {
986 removeRecursive(node
.firstChild
);
987 node
.removeChild(node
.firstChild
);
991 if (this.registeredEvents_
) {
992 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
993 var reg
= this.registeredEvents_
[idx
];
994 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
998 this.registeredEvents_
= [];
1000 // remove mouse event handlers (This may not be necessary anymore)
1001 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
1002 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
1003 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
1004 removeRecursive(this.maindiv_
);
1006 var nullOut
= function(obj
) {
1007 for (var n
in obj
) {
1008 if (typeof(obj
[n
]) === 'object') {
1013 // remove event handlers
1014 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
1015 this.resizeHandler
= null;
1016 // These may not all be necessary, but it can't hurt...
1017 nullOut(this.layout_
);
1018 nullOut(this.plotter_
);
1023 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1024 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1025 * or the zoom rectangles) is done on this.canvas_.
1026 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1027 * @return {Object} The newly-created canvas
1030 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1031 var h
= Dygraph
.createCanvas();
1032 h
.style
.position
= "absolute";
1033 // TODO(danvk): h should be offset from canvas. canvas needs to include
1034 // some extra area to make it easier to zoom in on the far left and far
1035 // right. h needs to be precisely the plot area, so that clipping occurs.
1036 h
.style
.top
= canvas
.style
.top
;
1037 h
.style
.left
= canvas
.style
.left
;
1038 h
.width
= this.width_
;
1039 h
.height
= this.height_
;
1040 h
.style
.width
= this.width_
+ "px"; // for IE
1041 h
.style
.height
= this.height_
+ "px"; // for IE
1046 * Creates an overlay element used to handle mouse events.
1047 * @return {Object} The mouse event element.
1050 Dygraph
.prototype.createMouseEventElement_
= function() {
1051 if (this.isUsingExcanvas_
) {
1052 var elem
= document
.createElement("div");
1053 elem
.style
.position
= 'absolute';
1054 elem
.style
.backgroundColor
= 'white';
1055 elem
.style
.filter
= 'alpha(opacity=0)';
1056 elem
.style
.width
= this.width_
+ "px";
1057 elem
.style
.height
= this.height_
+ "px";
1058 this.graphDiv
.appendChild(elem
);
1061 return this.canvas_
;
1066 * Generate a set of distinct colors for the data series. This is done with a
1067 * color wheel. Saturation/Value are customizable, and the hue is
1068 * equally-spaced around the color wheel. If a custom set of colors is
1069 * specified, that is used instead.
1072 Dygraph
.prototype.setColors_
= function() {
1073 var labels
= this.getLabels();
1074 var num
= labels
.length
- 1;
1076 this.colorsMap_
= {};
1077 var colors
= this.attr_('colors');
1080 var sat
= this.attr_('colorSaturation') || 1.0;
1081 var val
= this.attr_('colorValue') || 0.5;
1082 var half
= Math
.ceil(num
/ 2);
1083 for (i
= 1; i
<= num
; i
++) {
1084 if (!this.visibility()[i
-1]) continue;
1085 // alternate colors for high contrast.
1086 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1087 var hue
= (1.0 * idx
/ (1 + num
));
1088 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1089 this.colors_
.push(colorStr
);
1090 this.colorsMap_
[labels
[i
]] = colorStr
;
1093 for (i
= 0; i
< num
; i
++) {
1094 if (!this.visibility()[i
]) continue;
1095 var colorStr
= colors
[i
% colors
.length
];
1096 this.colors_
.push(colorStr
);
1097 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1103 * Return the list of colors. This is either the list of colors passed in the
1104 * attributes or the autogenerated list of rgb(r,g,b) strings.
1105 * This does not return colors for invisible series.
1106 * @return {Array<string>} The list of colors.
1108 Dygraph
.prototype.getColors
= function() {
1109 return this.colors_
;
1113 * Returns a few attributes of a series, i.e. its color, its visibility, which
1114 * axis it's assigned to, and its column in the original data.
1115 * Returns null if the series does not exist.
1116 * Otherwise, returns an object with column, visibility, color and axis properties.
1117 * The "axis" property will be set to 1 for y1 and 2 for y2.
1118 * The "column" property can be fed back into getValue(row, column) to get
1119 * values for this series.
1121 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1123 var labels
= this.getLabels();
1124 for (var i
= 1; i
< labels
.length
; i
++) {
1125 if (labels
[i
] == series_name
) {
1130 if (idx
== -1) return null;
1135 visible
: this.visibility()[idx
- 1],
1136 color
: this.colorsMap_
[series_name
],
1137 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1142 * Create the text box to adjust the averaging period
1145 Dygraph
.prototype.createRollInterface_
= function() {
1146 // Create a roller if one doesn't exist already.
1147 if (!this.roller_
) {
1148 this.roller_
= document
.createElement("input");
1149 this.roller_
.type
= "text";
1150 this.roller_
.style
.display
= "none";
1151 this.graphDiv
.appendChild(this.roller_
);
1154 var display
= this.attr_('showRoller') ? 'block' : 'none';
1156 var area
= this.plotter_
.area
;
1157 var textAttr
= { "position": "absolute",
1159 "top": (area
.y
+ area
.h
- 25) + "px",
1160 "left": (area
.x
+ 1) + "px",
1163 this.roller_
.size
= "2";
1164 this.roller_
.value
= this.rollPeriod_
;
1165 for (var name
in textAttr
) {
1166 if (textAttr
.hasOwnProperty(name
)) {
1167 this.roller_
.style
[name
] = textAttr
[name
];
1172 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1177 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1178 * canvas (i.e. DOM Coords).
1180 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1181 return Dygraph
.pageX(e
) - context
.px
;
1186 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1187 * canvas (i.e. DOM Coords).
1189 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1190 return Dygraph
.pageY(e
) - context
.py
;
1194 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1198 Dygraph
.prototype.createDragInterface_
= function() {
1200 // Tracks whether the mouse is down right now
1202 isPanning
: false, // is this drag part of a pan?
1203 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1204 dragStartX
: null, // pixel coordinates
1205 dragStartY
: null, // pixel coordinates
1206 dragEndX
: null, // pixel coordinates
1207 dragEndY
: null, // pixel coordinates
1208 dragDirection
: null,
1209 prevEndX
: null, // pixel coordinates
1210 prevEndY
: null, // pixel coordinates
1211 prevDragDirection
: null,
1212 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1214 // The value on the left side of the graph when a pan operation starts.
1215 initialLeftmostDate
: null,
1217 // The number of units each pixel spans. (This won't be valid for log
1219 xUnitsPerPixel
: null,
1221 // TODO(danvk): update this comment
1222 // The range in second/value units that the viewport encompasses during a
1223 // panning operation.
1226 // Top-left corner of the canvas, in DOM coords
1227 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1231 // Values for use with panEdgeFraction, which limit how far outside the
1232 // graph's data boundaries it can be panned.
1233 boundedDates
: null, // [minDate, maxDate]
1234 boundedValues
: null, // [[minValue, maxValue] ...]
1236 // We cover iframes during mouse interactions. See comments in
1237 // dygraph-utils.js for more info on why this is a good idea.
1238 tarp
: new Dygraph
.IFrameTarp(),
1240 // contextB is the same thing as this context object but renamed.
1241 initializeMouseDown
: function(event
, g
, contextB
) {
1242 // prevents mouse drags from selecting page text.
1243 if (event
.preventDefault
) {
1244 event
.preventDefault(); // Firefox, Chrome, etc.
1246 event
.returnValue
= false; // IE
1247 event
.cancelBubble
= true;
1250 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1251 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1252 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1253 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1254 contextB
.cancelNextDblclick
= false;
1255 contextB
.tarp
.cover();
1259 var interactionModel
= this.attr_("interactionModel");
1261 // Self is the graph.
1264 // Function that binds the graph and context to the handler.
1265 var bindHandler
= function(handler
) {
1266 return function(event
) {
1267 handler(event
, self
, context
);
1271 for (var eventName
in interactionModel
) {
1272 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1273 this.addEvent(this.mouseEventElement_
, eventName
,
1274 bindHandler(interactionModel
[eventName
]));
1277 // If the user releases the mouse button during a drag, but not over the
1278 // canvas, then it doesn't count as a zooming action.
1279 this.mouseUpHandler_
= function(event
) {
1280 if (context
.isZooming
|| context
.isPanning
) {
1281 context
.isZooming
= false;
1282 context
.dragStartX
= null;
1283 context
.dragStartY
= null;
1286 if (context
.isPanning
) {
1287 context
.isPanning
= false;
1288 context
.draggingDate
= null;
1289 context
.dateRange
= null;
1290 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1291 delete self
.axes_
[i
].draggingValue
;
1292 delete self
.axes_
[i
].dragValueRange
;
1296 context
.tarp
.uncover();
1299 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1303 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1304 * up any previous zoom rectangles that were drawn. This could be optimized to
1305 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1308 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1309 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1310 * @param {Number} startX The X position where the drag started, in canvas
1312 * @param {Number} endX The current X position of the drag, in canvas coords.
1313 * @param {Number} startY The Y position where the drag started, in canvas
1315 * @param {Number} endY The current Y position of the drag, in canvas coords.
1316 * @param {Number} prevDirection the value of direction on the previous call to
1317 * this function. Used to avoid excess redrawing
1318 * @param {Number} prevEndX The value of endX on the previous call to this
1319 * function. Used to avoid excess redrawing
1320 * @param {Number} prevEndY The value of endY on the previous call to this
1321 * function. Used to avoid excess redrawing
1324 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1325 endY
, prevDirection
, prevEndX
,
1327 var ctx
= this.canvas_ctx_
;
1329 // Clean up from the previous rect if necessary
1330 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1331 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1332 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1333 } else if (prevDirection
== Dygraph
.VERTICAL
){
1334 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1335 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1338 // Draw a light-grey rectangle to show the new viewing area
1339 if (direction
== Dygraph
.HORIZONTAL
) {
1340 if (endX
&& startX
) {
1341 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1342 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1343 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1345 } else if (direction
== Dygraph
.VERTICAL
) {
1346 if (endY
&& startY
) {
1347 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1348 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1349 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1353 if (this.isUsingExcanvas_
) {
1354 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1359 * Clear the zoom rectangle (and perform no zoom).
1362 Dygraph
.prototype.clearZoomRect_
= function() {
1363 this.currentZoomRectArgs_
= null;
1364 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1368 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1369 * the canvas. The exact zoom window may be slightly larger if there are no data
1370 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1371 * which accepts dates that match the raw data. This function redraws the graph.
1373 * @param {Number} lowX The leftmost pixel value that should be visible.
1374 * @param {Number} highX The rightmost pixel value that should be visible.
1377 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1378 this.currentZoomRectArgs_
= null;
1379 // Find the earliest and latest dates contained in this canvasx range.
1380 // Convert the call to date ranges of the raw data.
1381 var minDate
= this.toDataXCoord(lowX
);
1382 var maxDate
= this.toDataXCoord(highX
);
1383 this.doZoomXDates_(minDate
, maxDate
);
1387 * Transition function to use in animations. Returns values between 0.0
1388 * (totally old values) and 1.0 (totally new values) for each frame.
1391 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1393 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1397 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1398 * method with doZoomX which accepts pixel coordinates. This function redraws
1401 * @param {Number} minDate The minimum date that should be visible.
1402 * @param {Number} maxDate The maximum date that should be visible.
1405 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1406 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1407 // can produce strange effects. Rather than the y-axis transitioning slowly
1408 // between values, it can jerk around.)
1409 var old_window
= this.xAxisRange();
1410 var new_window
= [minDate
, maxDate
];
1411 this.zoomed_x_
= true;
1413 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1414 if (that
.attr_("zoomCallback")) {
1415 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1421 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1422 * the canvas. This function redraws the graph.
1424 * @param {Number} lowY The topmost pixel value that should be visible.
1425 * @param {Number} highY The lowest pixel value that should be visible.
1428 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1429 this.currentZoomRectArgs_
= null;
1430 // Find the highest and lowest values in pixel range for each axis.
1431 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1432 // This is because pixels increase as you go down on the screen, whereas data
1433 // coordinates increase as you go up the screen.
1434 var oldValueRanges
= this.yAxisRanges();
1435 var newValueRanges
= [];
1436 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1437 var hi
= this.toDataYCoord(lowY
, i
);
1438 var low
= this.toDataYCoord(highY
, i
);
1439 newValueRanges
.push([low
, hi
]);
1442 this.zoomed_y_
= true;
1444 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1445 if (that
.attr_("zoomCallback")) {
1446 var xRange
= that
.xAxisRange();
1447 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1453 * Reset the zoom to the original view coordinates. This is the same as
1454 * double-clicking on the graph.
1456 Dygraph
.prototype.resetZoom
= function() {
1457 var dirty
= false, dirtyX
= false, dirtyY
= false;
1458 if (this.dateWindow_
!== null) {
1463 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1464 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1470 // Clear any selection, since it's likely to be drawn in the wrong place.
1471 this.clearSelection();
1474 this.zoomed_x_
= false;
1475 this.zoomed_y_
= false;
1477 var minDate
= this.rawData_
[0][0];
1478 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1480 // With only one frame, don't bother calculating extreme ranges.
1481 // TODO(danvk): merge this block w/ the code below
.
1482 if (!this.attr_("animatedZooms")) {
1483 this.dateWindow_
= null;
1484 for (i
= 0; i
< this.axes_
.length
; i
++) {
1485 if (this.axes_
[i
].valueWindow
!== null) {
1486 delete this.axes_
[i
].valueWindow
;
1490 if (this.attr_("zoomCallback")) {
1491 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1496 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1498 oldWindow
= this.xAxisRange();
1499 newWindow
= [minDate
, maxDate
];
1503 oldValueRanges
= this.yAxisRanges();
1504 // TODO(danvk): this is pretty inefficient
1505 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1506 var extremes
= packed
[1];
1508 // this has the side-effect of modifying this.axes_.
1509 // this doesn't make much sense in this context, but it's convenient (we
1510 // need this.axes_[*].extremeValues) and not harmful since we'll be
1511 // calling drawGraph_ shortly, which clobbers these values.
1512 this.computeYAxisRanges_(extremes
);
1514 newValueRanges
= [];
1515 for (i
= 0; i
< this.axes_
.length
; i
++) {
1516 var axis
= this.axes_
[i
];
1517 newValueRanges
.push((axis
.valueRange
!== null &&
1518 axis
.valueRange
!== undefined
) ?
1519 axis
.valueRange
: axis
.extremeRange
);
1524 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1526 that
.dateWindow_
= null;
1527 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1528 if (that
.axes_
[i
].valueWindow
!== null) {
1529 delete that
.axes_
[i
].valueWindow
;
1532 if (that
.attr_("zoomCallback")) {
1533 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1540 * Combined animation logic for all zoom functions.
1541 * either the x parameters or y parameters may be null.
1544 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1545 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1548 var valueRanges
= [];
1551 if (oldXRange
!== null && newXRange
!== null) {
1552 for (step
= 1; step
<= steps
; step
++) {
1553 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1554 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1555 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1559 if (oldYRanges
!== null && newYRanges
!== null) {
1560 for (step
= 1; step
<= steps
; step
++) {
1561 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1563 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1564 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1565 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1567 valueRanges
[step
-1] = thisRange
;
1572 Dygraph
.repeatAndCleanup(function(step
) {
1573 if (valueRanges
.length
) {
1574 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1575 var w
= valueRanges
[step
][i
];
1576 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1579 if (windows
.length
) {
1580 that
.dateWindow_
= windows
[step
];
1583 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1587 * Get the current graph's area object.
1589 * Returns: {x, y, w, h}
1591 Dygraph
.prototype.getArea
= function() {
1592 return this.plotter_
.area
;
1596 * Convert a mouse event to DOM coordinates relative to the graph origin.
1598 * Returns a two-element array: [X, Y].
1600 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1601 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1602 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1603 return [canvasx
, canvasy
];
1607 * Given a canvas X coordinate, find the closest row.
1608 * @param {Number} domX graph-relative DOM X coordinate
1609 * Returns: row number, integer
1612 Dygraph
.prototype.findClosestRow
= function(domX
) {
1613 var minDistX
= Infinity
;
1614 var pointIdx
= -1, setIdx
= -1;
1615 var sets
= this.layout_
.points
;
1616 for (var i
= 0; i
< sets
.length
; i
++) {
1617 var points
= sets
[i
];
1618 var len
= points
.length
;
1619 for (var j
= 0; j
< len
; j
++) {
1620 var point
= points
[j
];
1621 if (!Dygraph
.isValidPoint(point
, true)) continue;
1622 var dist
= Math
.abs(point
.canvasx
- domX
);
1623 if (dist
< minDistX
) {
1631 // TODO(danvk): remove this function; it's trivial and has only one use.
1632 return this.idxToRow_(setIdx
, pointIdx
);
1636 * Given canvas X,Y coordinates, find the closest point.
1638 * This finds the individual data point across all visible series
1639 * that's closest to the supplied DOM coordinates using the standard
1640 * Euclidean X,Y distance.
1642 * @param {Number} domX graph-relative DOM X coordinate
1643 * @param {Number} domY graph-relative DOM Y coordinate
1644 * Returns: {row, seriesName, point}
1647 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1648 var minDist
= Infinity
;
1650 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1651 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1652 var points
= this.layout_
.points
[setIdx
];
1653 for (var i
= 0; i
< points
.length
; ++i
) {
1654 var point
= points
[i
];
1655 if (!Dygraph
.isValidPoint(point
)) continue;
1656 dx
= point
.canvasx
- domX
;
1657 dy
= point
.canvasy
- domY
;
1658 dist
= dx
* dx
+ dy
* dy
;
1659 if (dist
< minDist
) {
1661 closestPoint
= point
;
1662 closestSeries
= setIdx
;
1667 var name
= this.layout_
.setNames
[closestSeries
];
1669 row
: idx
+ this.getLeftBoundary_(),
1676 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1678 * This first finds the X data point closest to the supplied DOM X coordinate,
1679 * then finds the series which puts the Y coordinate on top of its filled area,
1680 * using linear interpolation between adjacent point pairs.
1682 * @param {Number} domX graph-relative DOM X coordinate
1683 * @param {Number} domY graph-relative DOM Y coordinate
1684 * Returns: {row, seriesName, point}
1687 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1688 var row
= this.findClosestRow(domX
);
1689 var boundary
= this.getLeftBoundary_();
1690 var rowIdx
= row
- boundary
;
1691 var closestPoint
, closestSeries
;
1692 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1693 var points
= this.layout_
.points
[setIdx
];
1694 if (rowIdx
>= points
.length
) continue;
1695 var p1
= points
[rowIdx
];
1696 if (!Dygraph
.isValidPoint(p1
)) continue;
1697 var py
= p1
.canvasy
;
1698 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1699 // interpolate series Y value using next point
1700 var p2
= points
[rowIdx
+ 1];
1701 if (Dygraph
.isValidPoint(p2
)) {
1702 var dx
= p2
.canvasx
- p1
.canvasx
;
1704 var r
= (domX
- p1
.canvasx
) / dx
;
1705 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1708 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1709 // interpolate series Y value using previous point
1710 var p0
= points
[rowIdx
- 1];
1711 if (Dygraph
.isValidPoint(p0
)) {
1712 var dx
= p1
.canvasx
- p0
.canvasx
;
1714 var r
= (p1
.canvasx
- domX
) / dx
;
1715 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1719 // Stop if the point (domX, py) is above this series' upper edge
1720 if (setIdx
=== 0 || py
< domY
) {
1722 closestSeries
= setIdx
;
1725 var name
= this.layout_
.setNames
[closestSeries
];
1734 * When the mouse moves in the canvas, display information about a nearby data
1735 * point and draw dots over those points in the data series. This function
1736 * takes care of cleanup of previously-drawn dots.
1737 * @param {Object} event The mousemove event from the browser.
1740 Dygraph
.prototype.mouseMove_
= function(event
) {
1741 // This prevents JS errors when mousing over the canvas before data loads.
1742 var points
= this.layout_
.points
;
1743 if (points
=== undefined
|| points
=== null) return;
1745 var canvasCoords
= this.eventToDomCoords(event
);
1746 var canvasx
= canvasCoords
[0];
1747 var canvasy
= canvasCoords
[1];
1749 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1750 var selectionChanged
= false;
1751 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1753 if (this.attr_("stackedGraph")) {
1754 closest
= this.findStackedPoint(canvasx
, canvasy
);
1756 closest
= this.findClosestPoint(canvasx
, canvasy
);
1758 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1760 var idx
= this.findClosestRow(canvasx
);
1761 selectionChanged
= this.setSelection(idx
);
1764 var callback
= this.attr_("highlightCallback");
1765 if (callback
&& selectionChanged
) {
1766 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1771 * Fetch left offset from first defined boundaryIds record (see bug #236).
1774 Dygraph
.prototype.getLeftBoundary_
= function() {
1775 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1776 if (this.boundaryIds_
[i
] !== undefined
) {
1777 return this.boundaryIds_
[i
][0];
1784 * Transforms layout_.points index into data row number.
1785 * @param int layout_.points index
1786 * @return int row number, or -1 if none could be found.
1789 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1790 if (rowIdx
< 0) return -1;
1792 var boundary
= this.getLeftBoundary_();
1793 return boundary
+ rowIdx
;
1794 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1795 // var set = this.layout_.datasets[setIdx];
1796 // if (idx < set.length) {
1797 // return boundary + idx;
1799 // idx -= set.length;
1804 Dygraph
.prototype.animateSelection_
= function(direction
) {
1805 var totalSteps
= 10;
1807 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1808 if (this.animateId
=== undefined
) this.animateId
= 0;
1809 var start
= this.fadeLevel
;
1810 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1812 if (this.fadeLevel
) {
1813 this.updateSelection_(1.0);
1818 var thisId
= ++this.animateId
;
1820 Dygraph
.repeatAndCleanup(
1822 // ignore simultaneous animations
1823 if (that
.animateId
!= thisId
) return;
1825 that
.fadeLevel
+= direction
;
1826 if (that
.fadeLevel
=== 0) {
1827 that
.clearSelection();
1829 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1832 steps
, millis
, function() {});
1836 * Draw dots over the selectied points in the data series. This function
1837 * takes care of cleanup of previously-drawn dots.
1840 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1841 /*var defaultPrevented = */
1842 this.cascadeEvents_('select', {
1843 selectedX
: this.lastx_
,
1844 selectedPoints
: this.selPoints_
1846 // TODO(danvk): use defaultPrevented here?
1848 // Clear the previously drawn vertical, if there is one
1850 var ctx
= this.canvas_ctx_
;
1851 if (this.attr_('highlightSeriesOpts')) {
1852 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1853 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1855 // Activating background fade includes an animation effect for a gradual
1856 // fade. TODO(klausw): make this independently configurable if it causes
1857 // issues? Use a shared preference to control animations?
1858 var animateBackgroundFade
= true;
1859 if (animateBackgroundFade
) {
1860 if (opt_animFraction
=== undefined
) {
1861 // start a new animation
1862 this.animateSelection_(1);
1865 alpha
*= opt_animFraction
;
1867 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1868 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1871 // Redraw only the highlighted series in the interactive canvas (not the
1872 // static plot canvas, which is where series are usually drawn).
1873 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1874 } else if (this.previousVerticalX_
>= 0) {
1875 // Determine the maximum highlight circle size.
1876 var maxCircleSize
= 0;
1877 var labels
= this.attr_('labels');
1878 for (i
= 1; i
< labels
.length
; i
++) {
1879 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1880 if (r
> maxCircleSize
) maxCircleSize
= r
;
1882 var px
= this.previousVerticalX_
;
1883 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1884 2 * maxCircleSize
+ 2, this.height_
);
1887 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1888 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1891 if (this.selPoints_
.length
> 0) {
1892 // Draw colored circles over the center of each selected point
1893 var canvasx
= this.selPoints_
[0].canvasx
;
1895 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1896 var pt
= this.selPoints_
[i
];
1897 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1899 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1900 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1901 var color
= this.plotter_
.colors
[pt
.name
];
1903 callback
= Dygraph
.Circles
.DEFAULT
;
1905 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1906 ctx
.strokeStyle
= color
;
1907 ctx
.fillStyle
= color
;
1908 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1913 this.previousVerticalX_
= canvasx
;
1918 * Manually set the selected points and display information about them in the
1919 * legend. The selection can be cleared using clearSelection() and queried
1920 * using getSelection().
1921 * @param { Integer } row number that should be highlighted (i.e. appear with
1922 * hover dots on the chart). Set to false to clear any selection.
1923 * @param { seriesName } optional series name to highlight that series with the
1924 * the highlightSeriesOpts setting.
1925 * @param { locked } optional If true, keep seriesName selected when mousing
1926 * over the graph, disabling closest-series highlighting. Call clearSelection()
1929 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1930 // Extract the points we've selected
1931 this.selPoints_
= [];
1933 if (row
!== false) {
1934 row
-= this.getLeftBoundary_();
1937 var changed
= false;
1938 if (row
!== false && row
>= 0) {
1939 if (row
!= this.lastRow_
) changed
= true;
1940 this.lastRow_
= row
;
1941 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1942 var set
= this.layout_
.datasets
[setIdx
];
1943 if (row
< set
.length
) {
1944 var point
= this.layout_
.points
[setIdx
][row
];
1946 if (this.attr_("stackedGraph")) {
1947 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1950 if (point
.yval
!== null) this.selPoints_
.push(point
);
1954 if (this.lastRow_
>= 0) changed
= true;
1958 if (this.selPoints_
.length
) {
1959 this.lastx_
= this.selPoints_
[0].xval
;
1964 if (opt_seriesName
!== undefined
) {
1965 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1966 this.highlightSet_
= opt_seriesName
;
1969 if (opt_locked
!== undefined
) {
1970 this.lockedSet_
= opt_locked
;
1974 this.updateSelection_(undefined
);
1980 * The mouse has left the canvas. Clear out whatever artifacts remain
1981 * @param {Object} event the mouseout event from the browser.
1984 Dygraph
.prototype.mouseOut_
= function(event
) {
1985 if (this.attr_("unhighlightCallback")) {
1986 this.attr_("unhighlightCallback")(event
);
1989 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
1990 this.clearSelection();
1995 * Clears the current selection (i.e. points that were highlighted by moving
1996 * the mouse over the chart).
1998 Dygraph
.prototype.clearSelection
= function() {
1999 this.cascadeEvents_('deselect', {});
2001 this.lockedSet_
= false;
2002 // Get rid of the overlay data
2003 if (this.fadeLevel
) {
2004 this.animateSelection_(-1);
2007 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2009 this.selPoints_
= [];
2012 this.highlightSet_
= null;
2016 * Returns the number of the currently selected row. To get data for this row,
2017 * you can use the getValue method.
2018 * @return { Integer } row number, or -1 if nothing is selected
2020 Dygraph
.prototype.getSelection
= function() {
2021 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2025 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2026 var points
= this.layout_
.points
[setIdx
];
2027 for (var row
= 0; row
< points
.length
; row
++) {
2028 if (points
[row
].x
== this.selPoints_
[0].x
) {
2029 return row
+ this.getLeftBoundary_();
2037 * Returns the name of the currently-highlighted series.
2038 * Only available when the highlightSeriesOpts option is in use.
2040 Dygraph
.prototype.getHighlightSeries
= function() {
2041 return this.highlightSet_
;
2045 * Returns true if the currently-highlighted series was locked
2046 * via setSelection(..., seriesName, true).
2048 Dygraph
.prototype.isSeriesLocked
= function() {
2049 return this.lockedSet_
;
2053 * Fires when there's data available to be graphed.
2054 * @param {String} data Raw CSV data to be plotted
2057 Dygraph
.prototype.loadedEvent_
= function(data
) {
2058 this.rawData_
= this.parseCSV_(data
);
2063 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2066 Dygraph
.prototype.addXTicks_
= function() {
2067 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2069 if (this.dateWindow_
) {
2070 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2072 range
= this.fullXRange_();
2075 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2076 var xTicks
= xAxisOptionsView('ticker')(
2079 this.width_
, // TODO(danvk): should be area.width
2082 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2083 // console.log(msg);
2084 this.layout_
.setXTicks(xTicks
);
2089 * Computes the range of the data series (including confidence intervals).
2090 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2091 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2092 * @return [low, high]
2094 Dygraph
.prototype.extremeValues_
= function(series
) {
2095 var minY
= null, maxY
= null, j
, y
;
2097 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2099 // With custom bars, maxY is the max of the high values.
2100 for (j
= 0; j
< series
.length
; j
++) {
2101 y
= series
[j
][1][0];
2102 if (y
=== null || isNaN(y
)) continue;
2103 var low
= y
- series
[j
][1][1];
2104 var high
= y
+ series
[j
][1][2];
2105 if (low
> y
) low
= y
; // this can happen with custom bars,
2106 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2107 if (maxY
=== null || high
> maxY
) {
2110 if (minY
=== null || low
< minY
) {
2115 for (j
= 0; j
< series
.length
; j
++) {
2117 if (y
=== null || isNaN(y
)) continue;
2118 if (maxY
=== null || y
> maxY
) {
2121 if (minY
=== null || y
< minY
) {
2127 return [minY
, maxY
];
2132 * This function is called once when the chart's data is changed or the options
2133 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2134 * idea is that values derived from the chart's data can be computed here,
2135 * rather than every time the chart is drawn. This includes things like the
2136 * number of axes, rolling averages, etc.
2138 Dygraph
.prototype.predraw_
= function() {
2139 var start
= new Date();
2141 this.layout_
.computePlotArea();
2143 // TODO(danvk): move more computations out of drawGraph_ and into here.
2144 this.computeYAxes_();
2146 // Create a new plotter.
2147 if (this.plotter_
) {
2148 this.cascadeEvents_('clearChart');
2149 this.plotter_
.clear();
2151 this.plotter_
= new DygraphCanvasRenderer(this,
2156 // The roller sits in the bottom left corner of the chart. We don't know where
2157 // this will be until the options are available, so it's positioned here.
2158 this.createRollInterface_();
2160 this.cascadeEvents_('predraw');
2162 // Convert the raw data (a 2D array) into the internal format and compute
2163 // rolling averages.
2164 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2165 for (var i
= 1; i
< this.numColumns(); i
++) {
2166 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2167 var logScale
= this.attr_('logscale');
2168 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2169 series
= this.rollingAverage(series
, this.rollPeriod_
);
2170 this.rolledSeries_
.push(series
);
2173 // If the data or options have changed, then we'd better redraw.
2176 // This is used to determine whether to do various animations.
2177 var end
= new Date();
2178 this.drawingTimeMs_
= (end
- start
);
2182 * Loop over all fields and create datasets, calculating extreme y-values for
2183 * each series and extreme x-indices as we go.
2185 * dateWindow is passed in as an explicit parameter so that we can compute
2186 * extreme values "speculatively", i.e. without actually setting state on the
2189 * TODO(danvk): make this more of a true function
2190 * @return [ datasets, seriesExtremes, boundaryIds ]
2193 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2194 var boundaryIds
= [];
2195 var cumulative_y
= []; // For stacked series.
2197 var extremes
= {}; // series name -> [low, high]
2200 // Loop over the fields (series). Go from the last to the first,
2201 // because if they're stacked that's how we accumulate the values.
2202 var num_series
= rolledSeries
.length
- 1;
2203 for (i
= num_series
; i
>= 1; i
--) {
2204 if (!this.visibility()[i
- 1]) continue;
2206 // Note: this copy _is_ necessary at the moment.
2207 // If you remove it, it breaks zooming with error bars on.
2208 // TODO(danvk): investigate further & write a test for this.
2210 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2211 series
.push(rolledSeries
[i
][j
]);
2214 // Prune down to the desired range, if necessary (for zooming)
2215 // Because there can be lines going to points outside of the visible area,
2216 // we actually prune to visible points, plus one on either side.
2217 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2219 var low
= dateWindow
[0];
2220 var high
= dateWindow
[1];
2222 // TODO(danvk): do binary search instead of linear search.
2223 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2224 var firstIdx
= null, lastIdx
= null;
2225 for (k
= 0; k
< series
.length
; k
++) {
2226 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2229 if (series
[k
][0] <= high
) {
2233 if (firstIdx
=== null) firstIdx
= 0;
2234 if (firstIdx
> 0) firstIdx
--;
2235 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2236 if (lastIdx
< series
.length
- 1) lastIdx
++;
2237 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2238 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2239 pruned
.push(series
[k
]);
2243 boundaryIds
[i
-1] = [0, series
.length
-1];
2246 var seriesExtremes
= this.extremeValues_(series
);
2249 for (j
=0; j
<series
.length
; j
++) {
2250 series
[j
] = [series
[j
][0],
2255 } else if (this.attr_("stackedGraph")) {
2256 var l
= series
.length
;
2258 for (j
= 0; j
< l
; j
++) {
2259 // If one data set has a NaN, let all subsequent stacked
2260 // sets inherit the NaN -- only start at 0 for the first set.
2261 var x
= series
[j
][0];
2262 if (cumulative_y
[x
] === undefined
) {
2263 cumulative_y
[x
] = 0;
2266 actual_y
= series
[j
][1];
2267 if (actual_y
=== null) {
2268 series
[j
] = [x
, null];
2272 cumulative_y
[x
] += actual_y
;
2274 series
[j
] = [x
, cumulative_y
[x
]];
2276 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2277 seriesExtremes
[1] = cumulative_y
[x
];
2279 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2280 seriesExtremes
[0] = cumulative_y
[x
];
2285 var seriesName
= this.attr_("labels")[i
];
2286 extremes
[seriesName
] = seriesExtremes
;
2287 datasets
[i
] = series
;
2290 // For stacked graphs, a NaN value for any point in the sum should create a
2291 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2292 if (this.attr_("stackedGraph")) {
2293 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2294 // Use the first nonempty dataset to get X values.
2295 if (!datasets
[k
]) continue;
2296 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2297 var x
= datasets
[k
][j
][0];
2298 if (isNaN(cumulative_y
[x
])) {
2299 // Set all Y values to NaN at that X value.
2300 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2301 if (!datasets
[i
]) continue;
2302 datasets
[i
][j
][1] = NaN
;
2310 return [ datasets
, extremes
, boundaryIds
];
2314 * Update the graph with new data. This method is called when the viewing area
2315 * has changed. If the underlying data or options have changed, predraw_ will
2316 * be called before drawGraph_ is called.
2320 Dygraph
.prototype.drawGraph_
= function() {
2321 var start
= new Date();
2323 // This is used to set the second parameter to drawCallback, below.
2324 var is_initial_draw
= this.is_initial_draw_
;
2325 this.is_initial_draw_
= false;
2327 this.layout_
.removeAllDatasets();
2329 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2331 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2332 var datasets
= packed
[0];
2333 var extremes
= packed
[1];
2334 this.boundaryIds_
= packed
[2];
2336 this.setIndexByName_
= {};
2337 var labels
= this.attr_("labels");
2338 if (labels
.length
> 0) {
2339 this.setIndexByName_
[labels
[0]] = 0;
2342 for (var i
= 1; i
< datasets
.length
; i
++) {
2343 this.setIndexByName_
[labels
[i
]] = i
;
2344 if (!this.visibility()[i
- 1]) continue;
2345 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2346 this.datasetIndex_
[i
] = dataIdx
++;
2349 this.computeYAxisRanges_(extremes
);
2350 this.layout_
.setYAxes(this.axes_
);
2354 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2355 var tmp_zoomed_x
= this.zoomed_x_
;
2356 // Tell PlotKit to use this new data and render itself
2357 this.layout_
.setDateWindow(this.dateWindow_
);
2358 this.zoomed_x_
= tmp_zoomed_x
;
2359 this.layout_
.evaluateWithError();
2360 this.renderGraph_(is_initial_draw
);
2362 if (this.attr_("timingName")) {
2363 var end
= new Date();
2365 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2371 * This does the work of drawing the chart. It assumes that the layout and axis
2372 * scales have already been set (e.g. by predraw_).
2376 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2377 this.cascadeEvents_('clearChart');
2378 this.plotter_
.clear();
2380 if (this.attr_('underlayCallback')) {
2381 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2382 // users who expect a deprecated form of this callback.
2383 this.attr_('underlayCallback')(
2384 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2388 canvas
: this.hidden_
,
2389 drawingContext
: this.hidden_ctx_
2391 this.cascadeEvents_('willDrawChart', e
);
2392 this.plotter_
.render();
2393 this.cascadeEvents_('didDrawChart', e
);
2395 // TODO(danvk): is this a performance bottleneck when panning?
2396 // The interaction canvas should already be empty in that situation.
2397 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2398 this.canvas_
.height
);
2400 if (this.attr_("drawCallback") !== null) {
2401 this.attr_("drawCallback")(this, is_initial_draw
);
2407 * Determine properties of the y-axes which are independent of the data
2408 * currently being displayed. This includes things like the number of axes and
2409 * the style of the axes. It does not include the range of each axis and its
2411 * This fills in this.axes_.
2412 * axes_ = [ { options } ]
2413 * indices are into the axes_ array.
2415 Dygraph
.prototype.computeYAxes_
= function() {
2416 // Preserve valueWindow settings if they exist, and if the user hasn't
2417 // specified a new valueRange.
2418 var valueWindows
, axis
, index
, opts
, v
;
2419 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2421 for (index
= 0; index
< this.axes_
.length
; index
++) {
2422 valueWindows
.push(this.axes_
[index
].valueWindow
);
2426 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2427 // data computation as well as options storage.
2428 // Go through once and add all the axes.
2431 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2432 // Add a new axis, making a copy of its per-axis options.
2433 opts
= { g
: this };
2434 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2435 this.axes_
[axis
] = opts
;
2439 // Copy global valueRange option over to the first axis.
2440 // NOTE(konigsberg): Are these two statements necessary?
2441 // I tried removing it. The automated tests pass, and manually
2442 // messing with tests/zoom
.html showed no trouble
.
2443 v
= this.attr_('valueRange');
2444 if (v
) this.axes_
[0].valueRange
= v
;
2446 if (valueWindows
!== undefined
) {
2447 // Restore valueWindow settings.
2448 for (index
= 0; index
< valueWindows
.length
; index
++) {
2449 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2453 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2455 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2456 v
= opts("valueRange");
2457 if (v
) this.axes_
[axis
].valueRange
= v
;
2458 } else { // To keep old behavior
2459 var axes
= this.user_attrs_
.axes
;
2460 if (axes
&& axes
.y2
) {
2461 v
= axes
.y2
.valueRange
;
2462 if (v
) this.axes_
[axis
].valueRange
= v
;
2469 * Returns the number of y-axes on the chart.
2470 * @return {Number} the number of axes.
2472 Dygraph
.prototype.numAxes
= function() {
2473 return this.attributes_
.numAxes();
2478 * Returns axis properties for the given series.
2479 * @param { String } setName The name of the series for which to get axis
2480 * properties, e.g. 'Y1'.
2481 * @return { Object } The axis properties.
2483 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2484 // TODO(danvk): handle errors.
2485 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2490 * Determine the value range and tick marks for each axis.
2491 * @param {Object} extremes A mapping from seriesName -> [low, high]
2492 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2494 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2496 var numAxes
= this.attributes_
.numAxes();
2498 // Compute extreme values, a span and tick marks for each axis.
2499 for (var i
= 0; i
< numAxes
; i
++) {
2500 var axis
= this.axes_
[i
];
2501 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2502 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2503 series
= this.attributes_
.seriesForAxis(i
);
2505 if (series
.length
=== 0) {
2506 // If no series are defined or visible then use a reasonable default
2507 axis
.extremeRange
= [0, 1];
2509 // Calculate the extremes of extremes.
2510 var minY
= Infinity
; // extremes[series[0]][0];
2511 var maxY
= -Infinity
; // extremes[series[0]][1];
2512 var extremeMinY
, extremeMaxY
;
2514 for (var j
= 0; j
< series
.length
; j
++) {
2515 // this skips invisible series
2516 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2518 // Only use valid extremes to stop null data series' from corrupting the scale.
2519 extremeMinY
= extremes
[series
[j
]][0];
2520 if (extremeMinY
!== null) {
2521 minY
= Math
.min(extremeMinY
, minY
);
2523 extremeMaxY
= extremes
[series
[j
]][1];
2524 if (extremeMaxY
!== null) {
2525 maxY
= Math
.max(extremeMaxY
, maxY
);
2528 if (includeZero
&& minY
> 0) minY
= 0;
2530 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2531 if (minY
== Infinity
) minY
= 0;
2532 if (maxY
== -Infinity
) maxY
= 1;
2534 // Add some padding and round up to an integer to be human-friendly.
2535 var span
= maxY
- minY
;
2536 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2537 if (span
=== 0) { span
= maxY
; }
2539 var maxAxisY
, minAxisY
;
2541 maxAxisY
= maxY
+ 0.1 * span
;
2544 maxAxisY
= maxY
+ 0.1 * span
;
2545 minAxisY
= minY
- 0.1 * span
;
2547 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2548 if (!this.attr_("avoidMinZero")) {
2549 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2550 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2553 if (this.attr_("includeZero")) {
2554 if (maxY
< 0) maxAxisY
= 0;
2555 if (minY
> 0) minAxisY
= 0;
2558 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2560 if (axis
.valueWindow
) {
2561 // This is only set if the user has zoomed on the y-axis. It is never set
2562 // by a user. It takes precedence over axis.valueRange because, if you set
2563 // valueRange, you'd still expect to be able to pan.
2564 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2565 } else if (axis
.valueRange
) {
2566 // This is a user-set value range for this axis.
2567 axis
.computedValueRange
= [
2568 !isNaN(axis
.valueRange
[0]) && axis
.valueRange
[0] !== null && axis
.valueRange
[0] !== undefined
? axis
.valueRange
[0] : axis
.extremeRange
[0],
2569 !isNaN(axis
.valueRange
[1]) && axis
.valueRange
[1] !== null && axis
.valueRange
[1] !== undefined
? axis
.valueRange
[1] : axis
.extremeRange
[1]
2572 axis
.computedValueRange
= axis
.extremeRange
;
2575 // Add ticks. By default, all axes inherit the tick positions of the
2576 // primary axis. However, if an axis is specifically marked as having
2577 // independent ticks, then that is permissible as well.
2578 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2579 var ticker
= opts('ticker');
2580 if (i
=== 0 || axis
.independentTicks
) {
2581 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2582 axis
.computedValueRange
[1],
2583 this.height_
, // TODO(danvk): should be area.height
2587 var p_axis
= this.axes_
[0];
2588 var p_ticks
= p_axis
.ticks
;
2589 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2590 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2591 var tick_values
= [];
2592 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2593 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2594 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2595 tick_values
.push(y_val
);
2598 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2599 axis
.computedValueRange
[1],
2600 this.height_
, // TODO(danvk): should be area.height
2609 * Extracts one series from the raw data (a 2D array) into an array of (date,
2612 * This is where undesirable points (i.e. negative values on log scales and
2613 * missing values through which we wish to connect lines) are dropped.
2614 * TODO(danvk): the "missing values" bit above doesn't seem right.
2618 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2619 // TODO(danvk): pre-allocate series here.
2621 for (var j
= 0; j
< rawData
.length
; j
++) {
2622 var x
= rawData
[j
][0];
2623 var point
= rawData
[j
][i
];
2625 // On the log scale, points less than zero do not exist.
2626 // This will create a gap in the chart.
2631 series
.push([x
, point
]);
2638 * Calculates the rolling average of a data set.
2639 * If originalData is [label, val], rolls the average of those.
2640 * If originalData is [label, [, it's interpreted as [value, stddev]
2641 * and the roll is returned in the same form, with appropriately reduced
2642 * stddev for each value.
2643 * Note that this is where fractional input (i.e. '5/10') is converted into
2645 * @param {Array} originalData The data in the appropriate format (see above)
2646 * @param {Number} rollPeriod The number of points over which to average the
2649 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2650 if (originalData
.length
< 2)
2651 return originalData
;
2652 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2653 var rollingData
= [];
2654 var sigma
= this.attr_("sigma");
2656 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2657 if (this.fractions_
) {
2659 var den
= 0; // numerator/denominator
2661 for (i
= 0; i
< originalData
.length
; i
++) {
2662 num
+= originalData
[i
][1][0];
2663 den
+= originalData
[i
][1][1];
2664 if (i
- rollPeriod
>= 0) {
2665 num
-= originalData
[i
- rollPeriod
][1][0];
2666 den
-= originalData
[i
- rollPeriod
][1][1];
2669 var date
= originalData
[i
][0];
2670 var value
= den
? num
/ den
: 0.0;
2671 if (this.attr_("errorBars")) {
2672 if (this.attr_("wilsonInterval")) {
2673 // For more details on this confidence interval, see:
2674 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2676 var p
= value
< 0 ? 0 : value
, n
= den
;
2677 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2678 var denom
= 1 + sigma
* sigma
/ den
;
2679 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2680 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2681 rollingData
[i
] = [date
,
2682 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2684 rollingData
[i
] = [date
, [0, 0, 0]];
2687 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2688 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2691 rollingData
[i
] = [date
, mult
* value
];
2694 } else if (this.attr_("customBars")) {
2699 for (i
= 0; i
< originalData
.length
; i
++) {
2700 var data
= originalData
[i
][1];
2702 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2704 if (y
!== null && !isNaN(y
)) {
2710 if (i
- rollPeriod
>= 0) {
2711 var prev
= originalData
[i
- rollPeriod
];
2712 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2720 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2721 1.0 * (mid
- low
) / count
,
2722 1.0 * (high
- mid
) / count
]];
2724 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2728 // Calculate the rolling average for the first rollPeriod - 1 points where
2729 // there is not enough data to roll over the full number of points
2730 if (!this.attr_("errorBars")){
2731 if (rollPeriod
== 1) {
2732 return originalData
;
2735 for (i
= 0; i
< originalData
.length
; i
++) {
2738 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2739 y
= originalData
[j
][1];
2740 if (y
=== null || isNaN(y
)) continue;
2742 sum
+= originalData
[j
][1];
2745 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2747 rollingData
[i
] = [originalData
[i
][0], null];
2752 for (i
= 0; i
< originalData
.length
; i
++) {
2756 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2757 y
= originalData
[j
][1][0];
2758 if (y
=== null || isNaN(y
)) continue;
2760 sum
+= originalData
[j
][1][0];
2761 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2764 stddev
= Math
.sqrt(variance
) / num_ok
;
2765 rollingData
[i
] = [originalData
[i
][0],
2766 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2768 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2778 * Detects the type of the str (date or numeric) and sets the various
2779 * formatting attributes in this.attrs_ based on this type.
2780 * @param {String} str An x value.
2783 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2785 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2786 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2787 str
.indexOf('/') >= 0 ||
2788 isNaN(parseFloat(str
))) {
2790 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2791 // TODO(danvk): remove support for this format.
2795 this.setXAxisOptions_(isDate
);
2798 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2800 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2801 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2802 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2803 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2805 /** @private (shut up, jsdoc!) */
2806 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2807 // TODO(danvk): use Dygraph.numberValueFormatter here?
2808 /** @private (shut up, jsdoc!) */
2809 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2810 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2811 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2816 * Parses the value as a floating point number. This is like the parseFloat()
2817 * built-in, but with a few differences:
2818 * - the empty string is parsed as null, rather than NaN.
2819 * - if the string cannot be parsed at all, an error is logged.
2820 * If the string can't be parsed, this method returns null.
2821 * @param {String} x The string to be parsed
2822 * @param {Number} opt_line_no The line number from which the string comes.
2823 * @param {String} opt_line The text of the line from which the string comes.
2827 // Parse the x as a float or return null if it's not a number.
2828 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2829 var val
= parseFloat(x
);
2830 if (!isNaN(val
)) return val
;
2832 // Try to figure out what happeend.
2833 // If the value is the empty string, parse it as null.
2834 if (/^ *$/.test(x
)) return null;
2836 // If it was actually "NaN", return it as NaN.
2837 if (/^ *nan *$/i.test(x
)) return NaN
;
2839 // Looks like a parsing error.
2840 var msg
= "Unable to parse '" + x
+ "' as a number";
2841 if (opt_line
!== null && opt_line_no
!== null) {
2842 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2851 * Parses a string in a special csv format. We expect a csv file where each
2852 * line is a date point, and the first field in each line is the date string.
2853 * We also expect that all remaining fields represent series.
2854 * if the errorBars attribute is set, then interpret the fields as:
2855 * date, series1, stddev1, series2, stddev2, ...
2856 * @param {[Object]} data See above.
2858 * @return [Object] An array with one entry for each row. These entries
2859 * are an array of cells in that row. The first entry is the parsed x-value for
2860 * the row. The second, third, etc. are the y-values. These can take on one of
2861 * three forms, depending on the CSV and constructor parameters:
2863 * 2. [ value, stddev ]
2864 * 3. [ low value, center value, high value ]
2866 Dygraph
.prototype.parseCSV_
= function(data
) {
2868 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2869 var lines
= data
.split(line_delimiter
|| "\n");
2872 // Use the default delimiter or fall back to a tab if that makes sense.
2873 var delim
= this.attr_('delimiter');
2874 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2879 if (!('labels' in this.user_attrs_
)) {
2880 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2882 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2883 this.attributes_
.reparseSeries();
2888 var defaultParserSet
= false; // attempt to auto-detect x value type
2889 var expectedCols
= this.attr_("labels").length
;
2890 var outOfOrder
= false;
2891 for (var i
= start
; i
< lines
.length
; i
++) {
2892 var line
= lines
[i
];
2894 if (line
.length
=== 0) continue; // skip blank lines
2895 if (line
[0] == '#') continue; // skip comment lines
2896 var inFields
= line
.split(delim
);
2897 if (inFields
.length
< 2) continue;
2900 if (!defaultParserSet
) {
2901 this.detectTypeFromString_(inFields
[0]);
2902 xParser
= this.attr_("xValueParser");
2903 defaultParserSet
= true;
2905 fields
[0] = xParser(inFields
[0], this);
2907 // If fractions are expected, parse the numbers as "A/B
"
2908 if (this.fractions_) {
2909 for (j = 1; j < inFields.length; j++) {
2910 // TODO(danvk): figure out an appropriate way to flag parse errors.
2911 vals = inFields[j].split("/");
2912 if (vals.length != 2) {
2913 this.error('Expected fractional "num
/den
" values in CSV data ' +
2914 "but found a value
'" + inFields[j] + "' on line
" +
2915 (1 + i) + " ('" + line + "') which is not of
this form
.");
2918 fields[j] = [this.parseFloat_(vals[0], i, line),
2919 this.parseFloat_(vals[1], i, line)];
2922 } else if (this.attr_("errorBars
")) {
2923 // If there are error bars, values are (value, stddev) pairs
2924 if (inFields.length % 2 != 1) {
2925 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2926 'but line ' + (1 + i) + ' has an odd number of values (' +
2927 (inFields.length - 1) + "): '" + line + "'");
2929 for (j = 1; j < inFields.length; j += 2) {
2930 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2931 this.parseFloat_(inFields[j + 1], i, line)];
2933 } else if (this.attr_("customBars
")) {
2934 // Bars are a low;center;high tuple
2935 for (j = 1; j < inFields.length; j++) {
2936 var val = inFields[j];
2937 if (/^ *$/.test(val)) {
2938 fields[j] = [null, null, null];
2940 vals = val.split(";");
2941 if (vals.length == 3) {
2942 fields[j] = [ this.parseFloat_(vals[0], i, line),
2943 this.parseFloat_(vals[1], i, line),
2944 this.parseFloat_(vals[2], i, line) ];
2946 this.warn('When using customBars, values must be either blank ' +
2947 'or "low
;center
;high
" tuples (got "' + val +
2948 '" on line ' + (1+i));
2953 // Values are just numbers
2954 for (j = 1; j < inFields.length; j++) {
2955 fields[j] = this.parseFloat_(inFields[j], i, line);
2958 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2962 if (fields.length != expectedCols) {
2963 this.error("Number of columns
in line
" + i + " (" + fields.length +
2964 ") does not agree
with number of
labels (" + expectedCols +
2968 // If the user specified the 'labels' option and none of the cells of the
2969 // first row parsed correctly, then they probably double-specified the
2970 // labels. We go with the values set in the option, discard this row and
2971 // log a warning to the JS console.
2972 if (i === 0 && this.attr_('labels')) {
2973 var all_null = true;
2974 for (j = 0; all_null && j < fields.length; j++) {
2975 if (fields[j]) all_null = false;
2978 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2979 "CSV
data ('" + line + "') appears to also contain labels
. " +
2980 "Will drop the CSV labels and
use the option labels
.");
2988 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2989 ret.sort(function(a,b) { return a[0] - b[0]; });
2997 * The user has provided their data as a pre-packaged JS array. If the x values
2998 * are numeric, this is the same as dygraphs' internal format. If the x values
2999 * are dates, we need to convert them from Date objects to ms since epoch.
3000 * @param {[Object]} data
3001 * @return {[Object]} data with numeric x values.
3003 Dygraph.prototype.parseArray_ = function(data) {
3004 // Peek at the first x value to see if it's numeric.
3005 if (data.length === 0) {
3006 this.error("Can
't plot empty data set");
3009 if (data[0].length === 0) {
3010 this.error("Data set cannot contain an empty row");
3015 if (this.attr_("labels") === null) {
3016 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3017 "in the options parameter");
3018 this.attrs_.labels = [ "X" ];
3019 for (i = 1; i < data[0].length; i++) {
3020 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3022 this.attributes_.reparseSeries();
3024 var num_labels = this.attr_("labels");
3025 if (num_labels.length != data[0].length) {
3026 this.error("Mismatch between number of labels (" + num_labels +
3027 ") and number of columns in array (" + data[0].length + ")");
3032 if (Dygraph.isDateLike(data[0][0])) {
3033 // Some intelligent defaults for a date x-axis.
3034 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3035 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3036 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3038 // Assume they're all dates
.
3039 var parsedData
= Dygraph
.clone(data
);
3040 for (i
= 0; i
< data
.length
; i
++) {
3041 if (parsedData
[i
].length
=== 0) {
3042 this.error("Row " + (1 + i
) + " of data is empty");
3045 if (parsedData
[i
][0] === null ||
3046 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3047 isNaN(parsedData
[i
][0].getTime())) {
3048 this.error("x value in row " + (1 + i
) + " is not a Date");
3051 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3055 // Some intelligent defaults for a numeric x-axis.
3056 /** @private (shut up, jsdoc!) */
3057 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3058 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3059 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3065 * Parses a DataTable object from gviz.
3066 * The data is expected to have a first column that is either a date or a
3067 * number. All subsequent columns must be numbers. If there is a clear mismatch
3068 * between this.xValueParser_ and the type of the first column, it will be
3069 * fixed. Fills out rawData_.
3070 * @param {[Object]} data See above.
3073 Dygraph
.prototype.parseDataTable_
= function(data
) {
3074 var shortTextForAnnotationNum
= function(num
) {
3075 // converts [0-9]+ [A-Z][a-z]*
3076 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3077 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3078 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3079 num
= Math
.floor(num
/ 26);
3081 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3082 num
= Math
.floor((num
- 1) / 26);
3087 var cols
= data
.getNumberOfColumns();
3088 var rows
= data
.getNumberOfRows();
3090 var indepType
= data
.getColumnType(0);
3091 if (indepType
== 'date' || indepType
== 'datetime') {
3092 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3093 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3094 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3095 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3096 } else if (indepType
== 'number') {
3097 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3098 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3099 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3100 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3102 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3103 "column 1 of DataTable input (Got '" + indepType
+ "')");
3107 // Array of the column indices which contain data (and not annotations).
3109 var annotationCols
= {}; // data index -> [annotation cols]
3110 var hasAnnotations
= false;
3112 for (i
= 1; i
< cols
; i
++) {
3113 var type
= data
.getColumnType(i
);
3114 if (type
== 'number') {
3116 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3117 // This is OK -- it's an annotation column.
3118 var dataIdx
= colIdx
[colIdx
.length
- 1];
3119 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3120 annotationCols
[dataIdx
] = [i
];
3122 annotationCols
[dataIdx
].push(i
);
3124 hasAnnotations
= true;
3126 this.error("Only 'number' is supported as a dependent type with Gviz." +
3127 " 'string' is only supported if displayAnnotations is true");
3131 // Read column labels
3132 // TODO(danvk): add support back for errorBars
3133 var labels
= [data
.getColumnLabel(0)];
3134 for (i
= 0; i
< colIdx
.length
; i
++) {
3135 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3136 if (this.attr_("errorBars")) i
+= 1;
3138 this.attrs_
.labels
= labels
;
3139 cols
= labels
.length
;
3142 var outOfOrder
= false;
3143 var annotations
= [];
3144 for (i
= 0; i
< rows
; i
++) {
3146 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3147 data
.getValue(i
, 0) === null) {
3148 this.warn("Ignoring row " + i
+
3149 " of DataTable because of undefined or null first column.");
3153 if (indepType
== 'date' || indepType
== 'datetime') {
3154 row
.push(data
.getValue(i
, 0).getTime());
3156 row
.push(data
.getValue(i
, 0));
3158 if (!this.attr_("errorBars")) {
3159 for (j
= 0; j
< colIdx
.length
; j
++) {
3160 var col
= colIdx
[j
];
3161 row
.push(data
.getValue(i
, col
));
3162 if (hasAnnotations
&&
3163 annotationCols
.hasOwnProperty(col
) &&
3164 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3166 ann
.series
= data
.getColumnLabel(col
);
3168 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3170 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3171 if (k
) ann
.text
+= "\n";
3172 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3174 annotations
.push(ann
);
3178 // Strip out infinities, which give dygraphs problems later on.
3179 for (j
= 0; j
< row
.length
; j
++) {
3180 if (!isFinite(row
[j
])) row
[j
] = null;
3183 for (j
= 0; j
< cols
- 1; j
++) {
3184 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3187 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3194 this.warn("DataTable is out of order; order it correctly to speed loading.");
3195 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3197 this.rawData_
= ret
;
3199 if (annotations
.length
> 0) {
3200 this.setAnnotations(annotations
, true);
3202 this.attributes_
.reparseSeries();
3206 * Get the CSV data. If it's in a function, call that function. If it's in a
3207 * file, do an XMLHttpRequest to get it.
3210 Dygraph
.prototype.start_
= function() {
3211 var data
= this.file_
;
3213 // Functions can return references of all other types.
3214 if (typeof data
== 'function') {
3218 if (Dygraph
.isArrayLike(data
)) {
3219 this.rawData_
= this.parseArray_(data
);
3221 } else if (typeof data
== 'object' &&
3222 typeof data
.getColumnRange
== 'function') {
3223 // must be a DataTable from gviz.
3224 this.parseDataTable_(data
);
3226 } else if (typeof data
== 'string') {
3227 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3228 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3229 if (line_delimiter
) {
3230 this.loadedEvent_(data
);
3232 var req
= new XMLHttpRequest();
3234 req
.onreadystatechange
= function () {
3235 if (req
.readyState
== 4) {
3236 if (req
.status
=== 200 || // Normal http
3237 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3238 caller
.loadedEvent_(req
.responseText
);
3243 req
.open("GET", data
, true);
3247 this.error("Unknown data format: " + (typeof data
));
3252 * Changes various properties of the graph. These can include:
3254 * <li>file: changes the source data for the graph</li>
3255 * <li>errorBars: changes whether the data contains stddev</li>
3258 * There's a huge variety of options that can be passed to this method. For a
3259 * full list, see http://dygraphs.com/options.html.
3261 * @param {Object} attrs The new properties and values
3262 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3263 * call to updateOptions(). If you know better, you can pass true to explicitly
3264 * block the redraw. This can be useful for chaining updateOptions() calls,
3265 * avoiding the occasional infinite loop and preventing redraws when it's not
3266 * necessary (e.g. when updating a callback).
3268 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3269 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3271 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3272 var file
= input_attrs
.file
;
3273 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3275 // TODO(danvk): this is a mess. Move these options into attr_.
3276 if ('rollPeriod' in attrs
) {
3277 this.rollPeriod_
= attrs
.rollPeriod
;
3279 if ('dateWindow' in attrs
) {
3280 this.dateWindow_
= attrs
.dateWindow
;
3281 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3282 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3285 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3286 this.zoomed_y_
= (attrs
.valueRange
!== null);
3289 // TODO(danvk): validate per-series options.
3294 // highlightCircleSize
3296 // Check if this set options will require new points.
3297 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3299 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3301 this.attributes_
.reparseSeries();
3305 if (!block_redraw
) this.start_();
3307 if (!block_redraw
) {
3308 if (requiresNewPoints
) {
3311 this.renderGraph_(false);
3318 * Returns a copy of the options with deprecated names converted into current
3319 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3320 * interested in that, they should save a copy before calling this.
3323 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3325 for (var k
in attrs
) {
3326 if (k
== 'file') continue;
3327 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3330 var set
= function(axis
, opt
, value
) {
3331 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3332 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3333 my_attrs
.axes
[axis
][opt
] = value
;
3335 var map
= function(opt
, axis
, new_opt
) {
3336 if (typeof(attrs
[opt
]) != 'undefined') {
3337 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3338 new_opt
+ " option for the " + axis
+ " axis instead. " +
3339 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3340 "(see http://dygraphs.com/per-axis.html for more information.");
3341 set(axis
, new_opt
, attrs
[opt
]);
3342 delete my_attrs
[opt
];
3346 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3347 map('xValueFormatter', 'x', 'valueFormatter');
3348 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3349 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3350 map('xTicker', 'x', 'ticker');
3351 map('yValueFormatter', 'y', 'valueFormatter');
3352 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3353 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3354 map('yTicker', 'y', 'ticker');
3359 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3360 * containing div (which has presumably changed size since the dygraph was
3361 * instantiated. If the width/height are specified, the div will be resized.
3363 * This is far more efficient than destroying and re-instantiating a
3364 * Dygraph, since it doesn't have to reparse the underlying data.
3366 * @param {Number} [width] Width (in pixels)
3367 * @param {Number} [height] Height (in pixels)
3369 Dygraph
.prototype.resize
= function(width
, height
) {
3370 if (this.resize_lock
) {
3373 this.resize_lock
= true;
3375 if ((width
=== null) != (height
=== null)) {
3376 this.warn("Dygraph.resize() should be called with zero parameters or " +
3377 "two non-NULL parameters. Pretending it was zero.");
3378 width
= height
= null;
3381 var old_width
= this.width_
;
3382 var old_height
= this.height_
;
3385 this.maindiv_
.style
.width
= width
+ "px";
3386 this.maindiv_
.style
.height
= height
+ "px";
3387 this.width_
= width
;
3388 this.height_
= height
;
3390 this.width_
= this.maindiv_
.clientWidth
;
3391 this.height_
= this.maindiv_
.clientHeight
;
3394 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3395 // TODO(danvk): there should be a clear() method.
3396 this.maindiv_
.innerHTML
= "";
3397 this.roller_
= null;
3398 this.attrs_
.labelsDiv
= null;
3399 this.createInterface_();
3400 if (this.annotations_
.length
) {
3401 // createInterface_ reset the layout, so we need to do this.
3402 this.layout_
.setAnnotations(this.annotations_
);
3404 this.createDragInterface_();
3408 this.resize_lock
= false;
3412 * Adjusts the number of points in the rolling average. Updates the graph to
3413 * reflect the new averaging period.
3414 * @param {Number} length Number of points over which to average the data.
3416 Dygraph
.prototype.adjustRoll
= function(length
) {
3417 this.rollPeriod_
= length
;
3422 * Returns a boolean array of visibility statuses.
3424 Dygraph
.prototype.visibility
= function() {
3425 // Do lazy-initialization, so that this happens after we know the number of
3427 if (!this.attr_("visibility")) {
3428 this.attrs_
.visibility
= [];
3430 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3431 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3432 this.attrs_
.visibility
.push(true);
3434 return this.attr_("visibility");
3438 * Changes the visiblity of a series.
3440 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3441 var x
= this.visibility();
3442 if (num
< 0 || num
>= x
.length
) {
3443 this.warn("invalid series number in setVisibility: " + num
);
3451 * How large of an area will the dygraph render itself in?
3452 * This is used for testing.
3453 * @return A {width: w, height: h} object.
3456 Dygraph
.prototype.size
= function() {
3457 return { width
: this.width_
, height
: this.height_
};
3461 * Update the list of annotations and redraw the chart.
3462 * See dygraphs.com/annotations.html for more info on how to use annotations.
3463 * @param ann {Array} An array of annotation objects.
3464 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3466 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3467 // Only add the annotation CSS rule once we know it will be used.
3468 Dygraph
.addAnnotationRule();
3469 this.annotations_
= ann
;
3470 this.layout_
.setAnnotations(this.annotations_
);
3471 if (!suppressDraw
) {
3477 * Return the list of annotations.
3479 Dygraph
.prototype.annotations
= function() {
3480 return this.annotations_
;
3484 * Get the list of label names for this graph. The first column is the
3485 * x-axis, so the data series names start at index 1.
3487 Dygraph
.prototype.getLabels
= function() {
3488 return this.attr_("labels").slice();
3492 * Get the index of a series (column) given its name. The first column is the
3493 * x-axis, so the data series start with index 1.
3495 Dygraph
.prototype.indexFromSetName
= function(name
) {
3496 return this.setIndexByName_
[name
];
3500 * Get the internal dataset index given its name. These are numbered starting from 0,
3501 * and only count visible sets.
3504 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3505 return this.datasetIndex_
[this.indexFromSetName(name
)];
3510 * Adds a default style for the annotation CSS classes to the document. This is
3511 * only executed when annotations are actually used. It is designed to only be
3512 * called once -- all calls after the first will return immediately.
3514 Dygraph
.addAnnotationRule
= function() {
3515 // TODO(danvk): move this function into plugins/annotations.js
?
3516 if (Dygraph
.addedAnnotationCSS
) return;
3518 var rule
= "border: 1px solid black; " +
3519 "background-color: white; " +
3520 "text-align: center;";
3522 var styleSheetElement
= document
.createElement("style");
3523 styleSheetElement
.type
= "text/css";
3524 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3526 // Find the first style sheet that we can access.
3527 // We may not add a rule to a style sheet from another domain for security
3528 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3529 // adds its own style sheets from google.com.
3530 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3531 if (document
.styleSheets
[i
].disabled
) continue;
3532 var mysheet
= document
.styleSheets
[i
];
3534 if (mysheet
.insertRule
) { // Firefox
3535 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3536 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3537 } else if (mysheet
.addRule
) { // IE
3538 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3540 Dygraph
.addedAnnotationCSS
= true;
3543 // Was likely a security exception.
3547 this.warn("Unable to add default annotation CSS rule; display may be off.");
3550 // Older pages may still use this name.
3551 var DateGraph
= Dygraph
;