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
);
970 if (this.resizeHandler
) {
971 // remove handler because it's already setup.
972 Dygraph
.removeEvent(window
, 'resize', this.resizeHandler
);
975 this.resizeHandler
= function(e
) {
979 // Update when the window is resized.
980 // TODO(danvk): drop frames depending on complexity of the chart.
981 this.addEvent(window
, 'resize', this.resizeHandler
);
985 * Detach DOM elements in the dygraph and null out all data references.
986 * Calling this when you're done with a dygraph can dramatically reduce memory
987 * usage. See, e.g., the tests/perf.html example.
989 Dygraph
.prototype.destroy
= function() {
990 var removeRecursive
= function(node
) {
991 while (node
.hasChildNodes()) {
992 removeRecursive(node
.firstChild
);
993 node
.removeChild(node
.firstChild
);
997 if (this.registeredEvents_
) {
998 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
999 var reg
= this.registeredEvents_
[idx
];
1000 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
1004 this.registeredEvents_
= [];
1006 // remove mouse event handlers (This may not be necessary anymore)
1007 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
1008 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
1009 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
1010 removeRecursive(this.maindiv_
);
1012 var nullOut
= function(obj
) {
1013 for (var n
in obj
) {
1014 if (typeof(obj
[n
]) === 'object') {
1019 // remove event handlers
1020 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
1021 this.resizeHandler
= null;
1022 // These may not all be necessary, but it can't hurt...
1023 nullOut(this.layout_
);
1024 nullOut(this.plotter_
);
1029 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1030 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1031 * or the zoom rectangles) is done on this.canvas_.
1032 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1033 * @return {Object} The newly-created canvas
1036 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1037 var h
= Dygraph
.createCanvas();
1038 h
.style
.position
= "absolute";
1039 // TODO(danvk): h should be offset from canvas. canvas needs to include
1040 // some extra area to make it easier to zoom in on the far left and far
1041 // right. h needs to be precisely the plot area, so that clipping occurs.
1042 h
.style
.top
= canvas
.style
.top
;
1043 h
.style
.left
= canvas
.style
.left
;
1044 h
.width
= this.width_
;
1045 h
.height
= this.height_
;
1046 h
.style
.width
= this.width_
+ "px"; // for IE
1047 h
.style
.height
= this.height_
+ "px"; // for IE
1052 * Creates an overlay element used to handle mouse events.
1053 * @return {Object} The mouse event element.
1056 Dygraph
.prototype.createMouseEventElement_
= function() {
1057 if (this.isUsingExcanvas_
) {
1058 var elem
= document
.createElement("div");
1059 elem
.style
.position
= 'absolute';
1060 elem
.style
.backgroundColor
= 'white';
1061 elem
.style
.filter
= 'alpha(opacity=0)';
1062 elem
.style
.width
= this.width_
+ "px";
1063 elem
.style
.height
= this.height_
+ "px";
1064 this.graphDiv
.appendChild(elem
);
1067 return this.canvas_
;
1072 * Generate a set of distinct colors for the data series. This is done with a
1073 * color wheel. Saturation/Value are customizable, and the hue is
1074 * equally-spaced around the color wheel. If a custom set of colors is
1075 * specified, that is used instead.
1078 Dygraph
.prototype.setColors_
= function() {
1079 var labels
= this.getLabels();
1080 var num
= labels
.length
- 1;
1082 this.colorsMap_
= {};
1083 var colors
= this.attr_('colors');
1086 var sat
= this.attr_('colorSaturation') || 1.0;
1087 var val
= this.attr_('colorValue') || 0.5;
1088 var half
= Math
.ceil(num
/ 2);
1089 for (i
= 1; i
<= num
; i
++) {
1090 if (!this.visibility()[i
-1]) continue;
1091 // alternate colors for high contrast.
1092 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1093 var hue
= (1.0 * idx
/ (1 + num
));
1094 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1095 this.colors_
.push(colorStr
);
1096 this.colorsMap_
[labels
[i
]] = colorStr
;
1099 for (i
= 0; i
< num
; i
++) {
1100 if (!this.visibility()[i
]) continue;
1101 var colorStr
= colors
[i
% colors
.length
];
1102 this.colors_
.push(colorStr
);
1103 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1109 * Return the list of colors. This is either the list of colors passed in the
1110 * attributes or the autogenerated list of rgb(r,g,b) strings.
1111 * This does not return colors for invisible series.
1112 * @return {Array<string>} The list of colors.
1114 Dygraph
.prototype.getColors
= function() {
1115 return this.colors_
;
1119 * Returns a few attributes of a series, i.e. its color, its visibility, which
1120 * axis it's assigned to, and its column in the original data.
1121 * Returns null if the series does not exist.
1122 * Otherwise, returns an object with column, visibility, color and axis properties.
1123 * The "axis" property will be set to 1 for y1 and 2 for y2.
1124 * The "column" property can be fed back into getValue(row, column) to get
1125 * values for this series.
1127 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1129 var labels
= this.getLabels();
1130 for (var i
= 1; i
< labels
.length
; i
++) {
1131 if (labels
[i
] == series_name
) {
1136 if (idx
== -1) return null;
1141 visible
: this.visibility()[idx
- 1],
1142 color
: this.colorsMap_
[series_name
],
1143 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1148 * Create the text box to adjust the averaging period
1151 Dygraph
.prototype.createRollInterface_
= function() {
1152 // Create a roller if one doesn't exist already.
1153 if (!this.roller_
) {
1154 this.roller_
= document
.createElement("input");
1155 this.roller_
.type
= "text";
1156 this.roller_
.style
.display
= "none";
1157 this.graphDiv
.appendChild(this.roller_
);
1160 var display
= this.attr_('showRoller') ? 'block' : 'none';
1162 var area
= this.plotter_
.area
;
1163 var textAttr
= { "position": "absolute",
1165 "top": (area
.y
+ area
.h
- 25) + "px",
1166 "left": (area
.x
+ 1) + "px",
1169 this.roller_
.size
= "2";
1170 this.roller_
.value
= this.rollPeriod_
;
1171 for (var name
in textAttr
) {
1172 if (textAttr
.hasOwnProperty(name
)) {
1173 this.roller_
.style
[name
] = textAttr
[name
];
1178 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1183 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1184 * canvas (i.e. DOM Coords).
1186 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1187 return Dygraph
.pageX(e
) - context
.px
;
1192 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1193 * canvas (i.e. DOM Coords).
1195 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1196 return Dygraph
.pageY(e
) - context
.py
;
1200 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1204 Dygraph
.prototype.createDragInterface_
= function() {
1206 // Tracks whether the mouse is down right now
1208 isPanning
: false, // is this drag part of a pan?
1209 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1210 dragStartX
: null, // pixel coordinates
1211 dragStartY
: null, // pixel coordinates
1212 dragEndX
: null, // pixel coordinates
1213 dragEndY
: null, // pixel coordinates
1214 dragDirection
: null,
1215 prevEndX
: null, // pixel coordinates
1216 prevEndY
: null, // pixel coordinates
1217 prevDragDirection
: null,
1218 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1220 // The value on the left side of the graph when a pan operation starts.
1221 initialLeftmostDate
: null,
1223 // The number of units each pixel spans. (This won't be valid for log
1225 xUnitsPerPixel
: null,
1227 // TODO(danvk): update this comment
1228 // The range in second/value units that the viewport encompasses during a
1229 // panning operation.
1232 // Top-left corner of the canvas, in DOM coords
1233 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1237 // Values for use with panEdgeFraction, which limit how far outside the
1238 // graph's data boundaries it can be panned.
1239 boundedDates
: null, // [minDate, maxDate]
1240 boundedValues
: null, // [[minValue, maxValue] ...]
1242 // We cover iframes during mouse interactions. See comments in
1243 // dygraph-utils.js for more info on why this is a good idea.
1244 tarp
: new Dygraph
.IFrameTarp(),
1246 // contextB is the same thing as this context object but renamed.
1247 initializeMouseDown
: function(event
, g
, contextB
) {
1248 // prevents mouse drags from selecting page text.
1249 if (event
.preventDefault
) {
1250 event
.preventDefault(); // Firefox, Chrome, etc.
1252 event
.returnValue
= false; // IE
1253 event
.cancelBubble
= true;
1256 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1257 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1258 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1259 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1260 contextB
.cancelNextDblclick
= false;
1261 contextB
.tarp
.cover();
1265 var interactionModel
= this.attr_("interactionModel");
1267 // Self is the graph.
1270 // Function that binds the graph and context to the handler.
1271 var bindHandler
= function(handler
) {
1272 return function(event
) {
1273 handler(event
, self
, context
);
1277 for (var eventName
in interactionModel
) {
1278 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1279 this.addEvent(this.mouseEventElement_
, eventName
,
1280 bindHandler(interactionModel
[eventName
]));
1283 // If the user releases the mouse button during a drag, but not over the
1284 // canvas, then it doesn't count as a zooming action.
1285 this.mouseUpHandler_
= function(event
) {
1286 if (context
.isZooming
|| context
.isPanning
) {
1287 context
.isZooming
= false;
1288 context
.dragStartX
= null;
1289 context
.dragStartY
= null;
1292 if (context
.isPanning
) {
1293 context
.isPanning
= false;
1294 context
.draggingDate
= null;
1295 context
.dateRange
= null;
1296 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1297 delete self
.axes_
[i
].draggingValue
;
1298 delete self
.axes_
[i
].dragValueRange
;
1302 context
.tarp
.uncover();
1305 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1309 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1310 * up any previous zoom rectangles that were drawn. This could be optimized to
1311 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1314 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1315 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1316 * @param {Number} startX The X position where the drag started, in canvas
1318 * @param {Number} endX The current X position of the drag, in canvas coords.
1319 * @param {Number} startY The Y position where the drag started, in canvas
1321 * @param {Number} endY The current Y position of the drag, in canvas coords.
1322 * @param {Number} prevDirection the value of direction on the previous call to
1323 * this function. Used to avoid excess redrawing
1324 * @param {Number} prevEndX The value of endX on the previous call to this
1325 * function. Used to avoid excess redrawing
1326 * @param {Number} prevEndY The value of endY on the previous call to this
1327 * function. Used to avoid excess redrawing
1330 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1331 endY
, prevDirection
, prevEndX
,
1333 var ctx
= this.canvas_ctx_
;
1335 // Clean up from the previous rect if necessary
1336 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1337 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1338 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1339 } else if (prevDirection
== Dygraph
.VERTICAL
){
1340 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1341 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1344 // Draw a light-grey rectangle to show the new viewing area
1345 if (direction
== Dygraph
.HORIZONTAL
) {
1346 if (endX
&& startX
) {
1347 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1348 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1349 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1351 } else if (direction
== Dygraph
.VERTICAL
) {
1352 if (endY
&& startY
) {
1353 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1354 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1355 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1359 if (this.isUsingExcanvas_
) {
1360 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1365 * Clear the zoom rectangle (and perform no zoom).
1368 Dygraph
.prototype.clearZoomRect_
= function() {
1369 this.currentZoomRectArgs_
= null;
1370 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1374 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1375 * the canvas. The exact zoom window may be slightly larger if there are no data
1376 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1377 * which accepts dates that match the raw data. This function redraws the graph.
1379 * @param {Number} lowX The leftmost pixel value that should be visible.
1380 * @param {Number} highX The rightmost pixel value that should be visible.
1383 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1384 this.currentZoomRectArgs_
= null;
1385 // Find the earliest and latest dates contained in this canvasx range.
1386 // Convert the call to date ranges of the raw data.
1387 var minDate
= this.toDataXCoord(lowX
);
1388 var maxDate
= this.toDataXCoord(highX
);
1389 this.doZoomXDates_(minDate
, maxDate
);
1393 * Transition function to use in animations. Returns values between 0.0
1394 * (totally old values) and 1.0 (totally new values) for each frame.
1397 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1399 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1403 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1404 * method with doZoomX which accepts pixel coordinates. This function redraws
1407 * @param {Number} minDate The minimum date that should be visible.
1408 * @param {Number} maxDate The maximum date that should be visible.
1411 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1412 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1413 // can produce strange effects. Rather than the y-axis transitioning slowly
1414 // between values, it can jerk around.)
1415 var old_window
= this.xAxisRange();
1416 var new_window
= [minDate
, maxDate
];
1417 this.zoomed_x_
= true;
1419 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1420 if (that
.attr_("zoomCallback")) {
1421 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1427 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1428 * the canvas. This function redraws the graph.
1430 * @param {Number} lowY The topmost pixel value that should be visible.
1431 * @param {Number} highY The lowest pixel value that should be visible.
1434 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1435 this.currentZoomRectArgs_
= null;
1436 // Find the highest and lowest values in pixel range for each axis.
1437 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1438 // This is because pixels increase as you go down on the screen, whereas data
1439 // coordinates increase as you go up the screen.
1440 var oldValueRanges
= this.yAxisRanges();
1441 var newValueRanges
= [];
1442 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1443 var hi
= this.toDataYCoord(lowY
, i
);
1444 var low
= this.toDataYCoord(highY
, i
);
1445 newValueRanges
.push([low
, hi
]);
1448 this.zoomed_y_
= true;
1450 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1451 if (that
.attr_("zoomCallback")) {
1452 var xRange
= that
.xAxisRange();
1453 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1459 * Reset the zoom to the original view coordinates. This is the same as
1460 * double-clicking on the graph.
1462 Dygraph
.prototype.resetZoom
= function() {
1463 var dirty
= false, dirtyX
= false, dirtyY
= false;
1464 if (this.dateWindow_
!== null) {
1469 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1470 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1476 // Clear any selection, since it's likely to be drawn in the wrong place.
1477 this.clearSelection();
1480 this.zoomed_x_
= false;
1481 this.zoomed_y_
= false;
1483 var minDate
= this.rawData_
[0][0];
1484 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1486 // With only one frame, don't bother calculating extreme ranges.
1487 // TODO(danvk): merge this block w/ the code below
.
1488 if (!this.attr_("animatedZooms")) {
1489 this.dateWindow_
= null;
1490 for (i
= 0; i
< this.axes_
.length
; i
++) {
1491 if (this.axes_
[i
].valueWindow
!== null) {
1492 delete this.axes_
[i
].valueWindow
;
1496 if (this.attr_("zoomCallback")) {
1497 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1502 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1504 oldWindow
= this.xAxisRange();
1505 newWindow
= [minDate
, maxDate
];
1509 oldValueRanges
= this.yAxisRanges();
1510 // TODO(danvk): this is pretty inefficient
1511 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1512 var extremes
= packed
[1];
1514 // this has the side-effect of modifying this.axes_.
1515 // this doesn't make much sense in this context, but it's convenient (we
1516 // need this.axes_[*].extremeValues) and not harmful since we'll be
1517 // calling drawGraph_ shortly, which clobbers these values.
1518 this.computeYAxisRanges_(extremes
);
1520 newValueRanges
= [];
1521 for (i
= 0; i
< this.axes_
.length
; i
++) {
1522 var axis
= this.axes_
[i
];
1523 newValueRanges
.push((axis
.valueRange
!== null &&
1524 axis
.valueRange
!== undefined
) ?
1525 axis
.valueRange
: axis
.extremeRange
);
1530 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1532 that
.dateWindow_
= null;
1533 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1534 if (that
.axes_
[i
].valueWindow
!== null) {
1535 delete that
.axes_
[i
].valueWindow
;
1538 if (that
.attr_("zoomCallback")) {
1539 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1546 * Combined animation logic for all zoom functions.
1547 * either the x parameters or y parameters may be null.
1550 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1551 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1554 var valueRanges
= [];
1557 if (oldXRange
!== null && newXRange
!== null) {
1558 for (step
= 1; step
<= steps
; step
++) {
1559 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1560 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1561 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1565 if (oldYRanges
!== null && newYRanges
!== null) {
1566 for (step
= 1; step
<= steps
; step
++) {
1567 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1569 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1570 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1571 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1573 valueRanges
[step
-1] = thisRange
;
1578 Dygraph
.repeatAndCleanup(function(step
) {
1579 if (valueRanges
.length
) {
1580 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1581 var w
= valueRanges
[step
][i
];
1582 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1585 if (windows
.length
) {
1586 that
.dateWindow_
= windows
[step
];
1589 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1593 * Get the current graph's area object.
1595 * Returns: {x, y, w, h}
1597 Dygraph
.prototype.getArea
= function() {
1598 return this.plotter_
.area
;
1602 * Convert a mouse event to DOM coordinates relative to the graph origin.
1604 * Returns a two-element array: [X, Y].
1606 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1607 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1608 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1609 return [canvasx
, canvasy
];
1613 * Given a canvas X coordinate, find the closest row.
1614 * @param {Number} domX graph-relative DOM X coordinate
1615 * Returns: row number, integer
1618 Dygraph
.prototype.findClosestRow
= function(domX
) {
1619 var minDistX
= Infinity
;
1620 var pointIdx
= -1, setIdx
= -1;
1621 var sets
= this.layout_
.points
;
1622 for (var i
= 0; i
< sets
.length
; i
++) {
1623 var points
= sets
[i
];
1624 var len
= points
.length
;
1625 for (var j
= 0; j
< len
; j
++) {
1626 var point
= points
[j
];
1627 if (!Dygraph
.isValidPoint(point
, true)) continue;
1628 var dist
= Math
.abs(point
.canvasx
- domX
);
1629 if (dist
< minDistX
) {
1637 // TODO(danvk): remove this function; it's trivial and has only one use.
1638 return this.idxToRow_(setIdx
, pointIdx
);
1642 * Given canvas X,Y coordinates, find the closest point.
1644 * This finds the individual data point across all visible series
1645 * that's closest to the supplied DOM coordinates using the standard
1646 * Euclidean X,Y distance.
1648 * @param {Number} domX graph-relative DOM X coordinate
1649 * @param {Number} domY graph-relative DOM Y coordinate
1650 * Returns: {row, seriesName, point}
1653 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1654 var minDist
= Infinity
;
1656 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1657 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1658 var points
= this.layout_
.points
[setIdx
];
1659 for (var i
= 0; i
< points
.length
; ++i
) {
1660 var point
= points
[i
];
1661 if (!Dygraph
.isValidPoint(point
)) continue;
1662 dx
= point
.canvasx
- domX
;
1663 dy
= point
.canvasy
- domY
;
1664 dist
= dx
* dx
+ dy
* dy
;
1665 if (dist
< minDist
) {
1667 closestPoint
= point
;
1668 closestSeries
= setIdx
;
1673 var name
= this.layout_
.setNames
[closestSeries
];
1675 row
: idx
+ this.getLeftBoundary_(),
1682 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1684 * This first finds the X data point closest to the supplied DOM X coordinate,
1685 * then finds the series which puts the Y coordinate on top of its filled area,
1686 * using linear interpolation between adjacent point pairs.
1688 * @param {Number} domX graph-relative DOM X coordinate
1689 * @param {Number} domY graph-relative DOM Y coordinate
1690 * Returns: {row, seriesName, point}
1693 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1694 var row
= this.findClosestRow(domX
);
1695 var boundary
= this.getLeftBoundary_();
1696 var rowIdx
= row
- boundary
;
1697 var closestPoint
, closestSeries
;
1698 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1699 var points
= this.layout_
.points
[setIdx
];
1700 if (rowIdx
>= points
.length
) continue;
1701 var p1
= points
[rowIdx
];
1702 if (!Dygraph
.isValidPoint(p1
)) continue;
1703 var py
= p1
.canvasy
;
1704 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1705 // interpolate series Y value using next point
1706 var p2
= points
[rowIdx
+ 1];
1707 if (Dygraph
.isValidPoint(p2
)) {
1708 var dx
= p2
.canvasx
- p1
.canvasx
;
1710 var r
= (domX
- p1
.canvasx
) / dx
;
1711 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1714 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1715 // interpolate series Y value using previous point
1716 var p0
= points
[rowIdx
- 1];
1717 if (Dygraph
.isValidPoint(p0
)) {
1718 var dx
= p1
.canvasx
- p0
.canvasx
;
1720 var r
= (p1
.canvasx
- domX
) / dx
;
1721 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1725 // Stop if the point (domX, py) is above this series' upper edge
1726 if (setIdx
=== 0 || py
< domY
) {
1728 closestSeries
= setIdx
;
1731 var name
= this.layout_
.setNames
[closestSeries
];
1740 * When the mouse moves in the canvas, display information about a nearby data
1741 * point and draw dots over those points in the data series. This function
1742 * takes care of cleanup of previously-drawn dots.
1743 * @param {Object} event The mousemove event from the browser.
1746 Dygraph
.prototype.mouseMove_
= function(event
) {
1747 // This prevents JS errors when mousing over the canvas before data loads.
1748 var points
= this.layout_
.points
;
1749 if (points
=== undefined
|| points
=== null) return;
1751 var canvasCoords
= this.eventToDomCoords(event
);
1752 var canvasx
= canvasCoords
[0];
1753 var canvasy
= canvasCoords
[1];
1755 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1756 var selectionChanged
= false;
1757 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1759 if (this.attr_("stackedGraph")) {
1760 closest
= this.findStackedPoint(canvasx
, canvasy
);
1762 closest
= this.findClosestPoint(canvasx
, canvasy
);
1764 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1766 var idx
= this.findClosestRow(canvasx
);
1767 selectionChanged
= this.setSelection(idx
);
1770 var callback
= this.attr_("highlightCallback");
1771 if (callback
&& selectionChanged
) {
1772 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1777 * Fetch left offset from first defined boundaryIds record (see bug #236).
1780 Dygraph
.prototype.getLeftBoundary_
= function() {
1781 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1782 if (this.boundaryIds_
[i
] !== undefined
) {
1783 return this.boundaryIds_
[i
][0];
1790 * Transforms layout_.points index into data row number.
1791 * @param int layout_.points index
1792 * @return int row number, or -1 if none could be found.
1795 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1796 if (rowIdx
< 0) return -1;
1798 var boundary
= this.getLeftBoundary_();
1799 return boundary
+ rowIdx
;
1800 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1801 // var set = this.layout_.datasets[setIdx];
1802 // if (idx < set.length) {
1803 // return boundary + idx;
1805 // idx -= set.length;
1810 Dygraph
.prototype.animateSelection_
= function(direction
) {
1811 var totalSteps
= 10;
1813 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1814 if (this.animateId
=== undefined
) this.animateId
= 0;
1815 var start
= this.fadeLevel
;
1816 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1818 if (this.fadeLevel
) {
1819 this.updateSelection_(1.0);
1824 var thisId
= ++this.animateId
;
1826 Dygraph
.repeatAndCleanup(
1828 // ignore simultaneous animations
1829 if (that
.animateId
!= thisId
) return;
1831 that
.fadeLevel
+= direction
;
1832 if (that
.fadeLevel
=== 0) {
1833 that
.clearSelection();
1835 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1838 steps
, millis
, function() {});
1842 * Draw dots over the selectied points in the data series. This function
1843 * takes care of cleanup of previously-drawn dots.
1846 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1847 /*var defaultPrevented = */
1848 this.cascadeEvents_('select', {
1849 selectedX
: this.lastx_
,
1850 selectedPoints
: this.selPoints_
1852 // TODO(danvk): use defaultPrevented here?
1854 // Clear the previously drawn vertical, if there is one
1856 var ctx
= this.canvas_ctx_
;
1857 if (this.attr_('highlightSeriesOpts')) {
1858 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1859 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1861 // Activating background fade includes an animation effect for a gradual
1862 // fade. TODO(klausw): make this independently configurable if it causes
1863 // issues? Use a shared preference to control animations?
1864 var animateBackgroundFade
= true;
1865 if (animateBackgroundFade
) {
1866 if (opt_animFraction
=== undefined
) {
1867 // start a new animation
1868 this.animateSelection_(1);
1871 alpha
*= opt_animFraction
;
1873 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1874 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1877 // Redraw only the highlighted series in the interactive canvas (not the
1878 // static plot canvas, which is where series are usually drawn).
1879 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1880 } else if (this.previousVerticalX_
>= 0) {
1881 // Determine the maximum highlight circle size.
1882 var maxCircleSize
= 0;
1883 var labels
= this.attr_('labels');
1884 for (i
= 1; i
< labels
.length
; i
++) {
1885 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1886 if (r
> maxCircleSize
) maxCircleSize
= r
;
1888 var px
= this.previousVerticalX_
;
1889 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1890 2 * maxCircleSize
+ 2, this.height_
);
1893 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1894 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1897 if (this.selPoints_
.length
> 0) {
1898 // Draw colored circles over the center of each selected point
1899 var canvasx
= this.selPoints_
[0].canvasx
;
1901 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1902 var pt
= this.selPoints_
[i
];
1903 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1905 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1906 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1907 var color
= this.plotter_
.colors
[pt
.name
];
1909 callback
= Dygraph
.Circles
.DEFAULT
;
1911 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1912 ctx
.strokeStyle
= color
;
1913 ctx
.fillStyle
= color
;
1914 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1919 this.previousVerticalX_
= canvasx
;
1924 * Manually set the selected points and display information about them in the
1925 * legend. The selection can be cleared using clearSelection() and queried
1926 * using getSelection().
1927 * @param { Integer } row number that should be highlighted (i.e. appear with
1928 * hover dots on the chart). Set to false to clear any selection.
1929 * @param { seriesName } optional series name to highlight that series with the
1930 * the highlightSeriesOpts setting.
1931 * @param { locked } optional If true, keep seriesName selected when mousing
1932 * over the graph, disabling closest-series highlighting. Call clearSelection()
1935 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1936 // Extract the points we've selected
1937 this.selPoints_
= [];
1939 if (row
!== false) {
1940 row
-= this.getLeftBoundary_();
1943 var changed
= false;
1944 if (row
!== false && row
>= 0) {
1945 if (row
!= this.lastRow_
) changed
= true;
1946 this.lastRow_
= row
;
1947 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1948 var set
= this.layout_
.datasets
[setIdx
];
1949 if (row
< set
.length
) {
1950 var point
= this.layout_
.points
[setIdx
][row
];
1952 if (this.attr_("stackedGraph")) {
1953 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1956 if (point
.yval
!== null) this.selPoints_
.push(point
);
1960 if (this.lastRow_
>= 0) changed
= true;
1964 if (this.selPoints_
.length
) {
1965 this.lastx_
= this.selPoints_
[0].xval
;
1970 if (opt_seriesName
!== undefined
) {
1971 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1972 this.highlightSet_
= opt_seriesName
;
1975 if (opt_locked
!== undefined
) {
1976 this.lockedSet_
= opt_locked
;
1980 this.updateSelection_(undefined
);
1986 * The mouse has left the canvas. Clear out whatever artifacts remain
1987 * @param {Object} event the mouseout event from the browser.
1990 Dygraph
.prototype.mouseOut_
= function(event
) {
1991 if (this.attr_("unhighlightCallback")) {
1992 this.attr_("unhighlightCallback")(event
);
1995 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
1996 this.clearSelection();
2001 * Clears the current selection (i.e. points that were highlighted by moving
2002 * the mouse over the chart).
2004 Dygraph
.prototype.clearSelection
= function() {
2005 this.cascadeEvents_('deselect', {});
2007 this.lockedSet_
= false;
2008 // Get rid of the overlay data
2009 if (this.fadeLevel
) {
2010 this.animateSelection_(-1);
2013 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2015 this.selPoints_
= [];
2018 this.highlightSet_
= null;
2022 * Returns the number of the currently selected row. To get data for this row,
2023 * you can use the getValue method.
2024 * @return { Integer } row number, or -1 if nothing is selected
2026 Dygraph
.prototype.getSelection
= function() {
2027 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2031 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2032 var points
= this.layout_
.points
[setIdx
];
2033 for (var row
= 0; row
< points
.length
; row
++) {
2034 if (points
[row
].x
== this.selPoints_
[0].x
) {
2035 return row
+ this.getLeftBoundary_();
2043 * Returns the name of the currently-highlighted series.
2044 * Only available when the highlightSeriesOpts option is in use.
2046 Dygraph
.prototype.getHighlightSeries
= function() {
2047 return this.highlightSet_
;
2051 * Returns true if the currently-highlighted series was locked
2052 * via setSelection(..., seriesName, true).
2054 Dygraph
.prototype.isSeriesLocked
= function() {
2055 return this.lockedSet_
;
2059 * Fires when there's data available to be graphed.
2060 * @param {String} data Raw CSV data to be plotted
2063 Dygraph
.prototype.loadedEvent_
= function(data
) {
2064 this.rawData_
= this.parseCSV_(data
);
2069 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2072 Dygraph
.prototype.addXTicks_
= function() {
2073 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2075 if (this.dateWindow_
) {
2076 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2078 range
= this.fullXRange_();
2081 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2082 var xTicks
= xAxisOptionsView('ticker')(
2085 this.width_
, // TODO(danvk): should be area.width
2088 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2089 // console.log(msg);
2090 this.layout_
.setXTicks(xTicks
);
2095 * Computes the range of the data series (including confidence intervals).
2096 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2097 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2098 * @return [low, high]
2100 Dygraph
.prototype.extremeValues_
= function(series
) {
2101 var minY
= null, maxY
= null, j
, y
;
2103 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2105 // With custom bars, maxY is the max of the high values.
2106 for (j
= 0; j
< series
.length
; j
++) {
2107 y
= series
[j
][1][0];
2108 if (y
=== null || isNaN(y
)) continue;
2109 var low
= y
- series
[j
][1][1];
2110 var high
= y
+ series
[j
][1][2];
2111 if (low
> y
) low
= y
; // this can happen with custom bars,
2112 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2113 if (maxY
=== null || high
> maxY
) {
2116 if (minY
=== null || low
< minY
) {
2121 for (j
= 0; j
< series
.length
; j
++) {
2123 if (y
=== null || isNaN(y
)) continue;
2124 if (maxY
=== null || y
> maxY
) {
2127 if (minY
=== null || y
< minY
) {
2133 return [minY
, maxY
];
2138 * This function is called once when the chart's data is changed or the options
2139 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2140 * idea is that values derived from the chart's data can be computed here,
2141 * rather than every time the chart is drawn. This includes things like the
2142 * number of axes, rolling averages, etc.
2144 Dygraph
.prototype.predraw_
= function() {
2145 var start
= new Date();
2147 this.layout_
.computePlotArea();
2149 // TODO(danvk): move more computations out of drawGraph_ and into here.
2150 this.computeYAxes_();
2152 // Create a new plotter.
2153 if (this.plotter_
) {
2154 this.cascadeEvents_('clearChart');
2155 this.plotter_
.clear();
2157 this.plotter_
= new DygraphCanvasRenderer(this,
2162 // The roller sits in the bottom left corner of the chart. We don't know where
2163 // this will be until the options are available, so it's positioned here.
2164 this.createRollInterface_();
2166 this.cascadeEvents_('predraw');
2168 // Convert the raw data (a 2D array) into the internal format and compute
2169 // rolling averages.
2170 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2171 for (var i
= 1; i
< this.numColumns(); i
++) {
2172 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2173 var logScale
= this.attr_('logscale');
2174 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2175 series
= this.rollingAverage(series
, this.rollPeriod_
);
2176 this.rolledSeries_
.push(series
);
2179 // If the data or options have changed, then we'd better redraw.
2182 // This is used to determine whether to do various animations.
2183 var end
= new Date();
2184 this.drawingTimeMs_
= (end
- start
);
2188 * Loop over all fields and create datasets, calculating extreme y-values for
2189 * each series and extreme x-indices as we go.
2191 * dateWindow is passed in as an explicit parameter so that we can compute
2192 * extreme values "speculatively", i.e. without actually setting state on the
2195 * TODO(danvk): make this more of a true function
2196 * @return [ datasets, seriesExtremes, boundaryIds ]
2199 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2200 var boundaryIds
= [];
2201 var cumulative_y
= []; // For stacked series.
2203 var extremes
= {}; // series name -> [low, high]
2206 // Loop over the fields (series). Go from the last to the first,
2207 // because if they're stacked that's how we accumulate the values.
2208 var num_series
= rolledSeries
.length
- 1;
2209 for (i
= num_series
; i
>= 1; i
--) {
2210 if (!this.visibility()[i
- 1]) continue;
2212 // Note: this copy _is_ necessary at the moment.
2213 // If you remove it, it breaks zooming with error bars on.
2214 // TODO(danvk): investigate further & write a test for this.
2216 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2217 series
.push(rolledSeries
[i
][j
]);
2220 // Prune down to the desired range, if necessary (for zooming)
2221 // Because there can be lines going to points outside of the visible area,
2222 // we actually prune to visible points, plus one on either side.
2223 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2225 var low
= dateWindow
[0];
2226 var high
= dateWindow
[1];
2228 // TODO(danvk): do binary search instead of linear search.
2229 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2230 var firstIdx
= null, lastIdx
= null;
2231 for (k
= 0; k
< series
.length
; k
++) {
2232 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2235 if (series
[k
][0] <= high
) {
2239 if (firstIdx
=== null) firstIdx
= 0;
2240 if (firstIdx
> 0) firstIdx
--;
2241 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2242 if (lastIdx
< series
.length
- 1) lastIdx
++;
2243 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2244 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2245 pruned
.push(series
[k
]);
2249 boundaryIds
[i
-1] = [0, series
.length
-1];
2252 var seriesExtremes
= this.extremeValues_(series
);
2255 for (j
=0; j
<series
.length
; j
++) {
2256 series
[j
] = [series
[j
][0],
2261 } else if (this.attr_("stackedGraph")) {
2262 var l
= series
.length
;
2264 for (j
= 0; j
< l
; j
++) {
2265 // If one data set has a NaN, let all subsequent stacked
2266 // sets inherit the NaN -- only start at 0 for the first set.
2267 var x
= series
[j
][0];
2268 if (cumulative_y
[x
] === undefined
) {
2269 cumulative_y
[x
] = 0;
2272 actual_y
= series
[j
][1];
2273 if (actual_y
=== null) {
2274 series
[j
] = [x
, null];
2278 cumulative_y
[x
] += actual_y
;
2280 series
[j
] = [x
, cumulative_y
[x
]];
2282 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2283 seriesExtremes
[1] = cumulative_y
[x
];
2285 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2286 seriesExtremes
[0] = cumulative_y
[x
];
2291 var seriesName
= this.attr_("labels")[i
];
2292 extremes
[seriesName
] = seriesExtremes
;
2293 datasets
[i
] = series
;
2296 // For stacked graphs, a NaN value for any point in the sum should create a
2297 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2298 if (this.attr_("stackedGraph")) {
2299 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2300 // Use the first nonempty dataset to get X values.
2301 if (!datasets
[k
]) continue;
2302 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2303 var x
= datasets
[k
][j
][0];
2304 if (isNaN(cumulative_y
[x
])) {
2305 // Set all Y values to NaN at that X value.
2306 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2307 if (!datasets
[i
]) continue;
2308 datasets
[i
][j
][1] = NaN
;
2316 return [ datasets
, extremes
, boundaryIds
];
2320 * Update the graph with new data. This method is called when the viewing area
2321 * has changed. If the underlying data or options have changed, predraw_ will
2322 * be called before drawGraph_ is called.
2326 Dygraph
.prototype.drawGraph_
= function() {
2327 var start
= new Date();
2329 // This is used to set the second parameter to drawCallback, below.
2330 var is_initial_draw
= this.is_initial_draw_
;
2331 this.is_initial_draw_
= false;
2333 this.layout_
.removeAllDatasets();
2335 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2337 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2338 var datasets
= packed
[0];
2339 var extremes
= packed
[1];
2340 this.boundaryIds_
= packed
[2];
2342 this.setIndexByName_
= {};
2343 var labels
= this.attr_("labels");
2344 if (labels
.length
> 0) {
2345 this.setIndexByName_
[labels
[0]] = 0;
2348 for (var i
= 1; i
< datasets
.length
; i
++) {
2349 this.setIndexByName_
[labels
[i
]] = i
;
2350 if (!this.visibility()[i
- 1]) continue;
2351 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2352 this.datasetIndex_
[i
] = dataIdx
++;
2355 this.computeYAxisRanges_(extremes
);
2356 this.layout_
.setYAxes(this.axes_
);
2360 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2361 var tmp_zoomed_x
= this.zoomed_x_
;
2362 // Tell PlotKit to use this new data and render itself
2363 this.layout_
.setDateWindow(this.dateWindow_
);
2364 this.zoomed_x_
= tmp_zoomed_x
;
2365 this.layout_
.evaluateWithError();
2366 this.renderGraph_(is_initial_draw
);
2368 if (this.attr_("timingName")) {
2369 var end
= new Date();
2371 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2377 * This does the work of drawing the chart. It assumes that the layout and axis
2378 * scales have already been set (e.g. by predraw_).
2382 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2383 this.cascadeEvents_('clearChart');
2384 this.plotter_
.clear();
2386 if (this.attr_('underlayCallback')) {
2387 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2388 // users who expect a deprecated form of this callback.
2389 this.attr_('underlayCallback')(
2390 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2394 canvas
: this.hidden_
,
2395 drawingContext
: this.hidden_ctx_
2397 this.cascadeEvents_('willDrawChart', e
);
2398 this.plotter_
.render();
2399 this.cascadeEvents_('didDrawChart', e
);
2401 // TODO(danvk): is this a performance bottleneck when panning?
2402 // The interaction canvas should already be empty in that situation.
2403 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2404 this.canvas_
.height
);
2406 if (this.attr_("drawCallback") !== null) {
2407 this.attr_("drawCallback")(this, is_initial_draw
);
2413 * Determine properties of the y-axes which are independent of the data
2414 * currently being displayed. This includes things like the number of axes and
2415 * the style of the axes. It does not include the range of each axis and its
2417 * This fills in this.axes_.
2418 * axes_ = [ { options } ]
2419 * indices are into the axes_ array.
2421 Dygraph
.prototype.computeYAxes_
= function() {
2422 // Preserve valueWindow settings if they exist, and if the user hasn't
2423 // specified a new valueRange.
2424 var valueWindows
, axis
, index
, opts
, v
;
2425 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2427 for (index
= 0; index
< this.axes_
.length
; index
++) {
2428 valueWindows
.push(this.axes_
[index
].valueWindow
);
2432 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2433 // data computation as well as options storage.
2434 // Go through once and add all the axes.
2437 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2438 // Add a new axis, making a copy of its per-axis options.
2439 opts
= { g
: this };
2440 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2441 this.axes_
[axis
] = opts
;
2445 // Copy global valueRange option over to the first axis.
2446 // NOTE(konigsberg): Are these two statements necessary?
2447 // I tried removing it. The automated tests pass, and manually
2448 // messing with tests/zoom
.html showed no trouble
.
2449 v
= this.attr_('valueRange');
2450 if (v
) this.axes_
[0].valueRange
= v
;
2452 if (valueWindows
!== undefined
) {
2453 // Restore valueWindow settings.
2454 for (index
= 0; index
< valueWindows
.length
; index
++) {
2455 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2459 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2461 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2462 v
= opts("valueRange");
2463 if (v
) this.axes_
[axis
].valueRange
= v
;
2464 } else { // To keep old behavior
2465 var axes
= this.user_attrs_
.axes
;
2466 if (axes
&& axes
.y2
) {
2467 v
= axes
.y2
.valueRange
;
2468 if (v
) this.axes_
[axis
].valueRange
= v
;
2475 * Returns the number of y-axes on the chart.
2476 * @return {Number} the number of axes.
2478 Dygraph
.prototype.numAxes
= function() {
2479 return this.attributes_
.numAxes();
2484 * Returns axis properties for the given series.
2485 * @param { String } setName The name of the series for which to get axis
2486 * properties, e.g. 'Y1'.
2487 * @return { Object } The axis properties.
2489 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2490 // TODO(danvk): handle errors.
2491 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2496 * Determine the value range and tick marks for each axis.
2497 * @param {Object} extremes A mapping from seriesName -> [low, high]
2498 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2500 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2502 var numAxes
= this.attributes_
.numAxes();
2504 // Compute extreme values, a span and tick marks for each axis.
2505 for (var i
= 0; i
< numAxes
; i
++) {
2506 var axis
= this.axes_
[i
];
2507 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2508 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2509 series
= this.attributes_
.seriesForAxis(i
);
2511 if (series
.length
=== 0) {
2512 // If no series are defined or visible then use a reasonable default
2513 axis
.extremeRange
= [0, 1];
2515 // Calculate the extremes of extremes.
2516 var minY
= Infinity
; // extremes[series[0]][0];
2517 var maxY
= -Infinity
; // extremes[series[0]][1];
2518 var extremeMinY
, extremeMaxY
;
2520 for (var j
= 0; j
< series
.length
; j
++) {
2521 // this skips invisible series
2522 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2524 // Only use valid extremes to stop null data series' from corrupting the scale.
2525 extremeMinY
= extremes
[series
[j
]][0];
2526 if (extremeMinY
!== null) {
2527 minY
= Math
.min(extremeMinY
, minY
);
2529 extremeMaxY
= extremes
[series
[j
]][1];
2530 if (extremeMaxY
!== null) {
2531 maxY
= Math
.max(extremeMaxY
, maxY
);
2534 if (includeZero
&& minY
> 0) minY
= 0;
2536 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2537 if (minY
== Infinity
) minY
= 0;
2538 if (maxY
== -Infinity
) maxY
= 1;
2540 // Add some padding and round up to an integer to be human-friendly.
2541 var span
= maxY
- minY
;
2542 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2543 if (span
=== 0) { span
= maxY
; }
2545 var maxAxisY
, minAxisY
;
2547 maxAxisY
= maxY
+ 0.1 * span
;
2550 maxAxisY
= maxY
+ 0.1 * span
;
2551 minAxisY
= minY
- 0.1 * span
;
2553 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2554 if (!this.attr_("avoidMinZero")) {
2555 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2556 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2559 if (this.attr_("includeZero")) {
2560 if (maxY
< 0) maxAxisY
= 0;
2561 if (minY
> 0) minAxisY
= 0;
2564 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2566 if (axis
.valueWindow
) {
2567 // This is only set if the user has zoomed on the y-axis. It is never set
2568 // by a user. It takes precedence over axis.valueRange because, if you set
2569 // valueRange, you'd still expect to be able to pan.
2570 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2571 } else if (axis
.valueRange
) {
2572 // This is a user-set value range for this axis.
2573 axis
.computedValueRange
= [
2574 !isNaN(axis
.valueRange
[0]) && axis
.valueRange
[0] !== null && axis
.valueRange
[0] !== undefined
? axis
.valueRange
[0] : axis
.extremeRange
[0],
2575 !isNaN(axis
.valueRange
[1]) && axis
.valueRange
[1] !== null && axis
.valueRange
[1] !== undefined
? axis
.valueRange
[1] : axis
.extremeRange
[1]
2578 axis
.computedValueRange
= axis
.extremeRange
;
2581 // Add ticks. By default, all axes inherit the tick positions of the
2582 // primary axis. However, if an axis is specifically marked as having
2583 // independent ticks, then that is permissible as well.
2584 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2585 var ticker
= opts('ticker');
2586 if (i
=== 0 || axis
.independentTicks
) {
2587 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2588 axis
.computedValueRange
[1],
2589 this.height_
, // TODO(danvk): should be area.height
2593 var p_axis
= this.axes_
[0];
2594 var p_ticks
= p_axis
.ticks
;
2595 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2596 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2597 var tick_values
= [];
2598 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2599 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2600 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2601 tick_values
.push(y_val
);
2604 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2605 axis
.computedValueRange
[1],
2606 this.height_
, // TODO(danvk): should be area.height
2615 * Extracts one series from the raw data (a 2D array) into an array of (date,
2618 * This is where undesirable points (i.e. negative values on log scales and
2619 * missing values through which we wish to connect lines) are dropped.
2620 * TODO(danvk): the "missing values" bit above doesn't seem right.
2624 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2625 // TODO(danvk): pre-allocate series here.
2627 for (var j
= 0; j
< rawData
.length
; j
++) {
2628 var x
= rawData
[j
][0];
2629 var point
= rawData
[j
][i
];
2631 // On the log scale, points less than zero do not exist.
2632 // This will create a gap in the chart.
2637 series
.push([x
, point
]);
2644 * Calculates the rolling average of a data set.
2645 * If originalData is [label, val], rolls the average of those.
2646 * If originalData is [label, [, it's interpreted as [value, stddev]
2647 * and the roll is returned in the same form, with appropriately reduced
2648 * stddev for each value.
2649 * Note that this is where fractional input (i.e. '5/10') is converted into
2651 * @param {Array} originalData The data in the appropriate format (see above)
2652 * @param {Number} rollPeriod The number of points over which to average the
2655 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2656 if (originalData
.length
< 2)
2657 return originalData
;
2658 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2659 var rollingData
= [];
2660 var sigma
= this.attr_("sigma");
2662 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2663 if (this.fractions_
) {
2665 var den
= 0; // numerator/denominator
2667 for (i
= 0; i
< originalData
.length
; i
++) {
2668 num
+= originalData
[i
][1][0];
2669 den
+= originalData
[i
][1][1];
2670 if (i
- rollPeriod
>= 0) {
2671 num
-= originalData
[i
- rollPeriod
][1][0];
2672 den
-= originalData
[i
- rollPeriod
][1][1];
2675 var date
= originalData
[i
][0];
2676 var value
= den
? num
/ den
: 0.0;
2677 if (this.attr_("errorBars")) {
2678 if (this.attr_("wilsonInterval")) {
2679 // For more details on this confidence interval, see:
2680 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2682 var p
= value
< 0 ? 0 : value
, n
= den
;
2683 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2684 var denom
= 1 + sigma
* sigma
/ den
;
2685 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2686 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2687 rollingData
[i
] = [date
,
2688 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2690 rollingData
[i
] = [date
, [0, 0, 0]];
2693 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2694 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2697 rollingData
[i
] = [date
, mult
* value
];
2700 } else if (this.attr_("customBars")) {
2705 for (i
= 0; i
< originalData
.length
; i
++) {
2706 var data
= originalData
[i
][1];
2708 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2710 if (y
!== null && !isNaN(y
)) {
2716 if (i
- rollPeriod
>= 0) {
2717 var prev
= originalData
[i
- rollPeriod
];
2718 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2726 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2727 1.0 * (mid
- low
) / count
,
2728 1.0 * (high
- mid
) / count
]];
2730 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2734 // Calculate the rolling average for the first rollPeriod - 1 points where
2735 // there is not enough data to roll over the full number of points
2736 if (!this.attr_("errorBars")){
2737 if (rollPeriod
== 1) {
2738 return originalData
;
2741 for (i
= 0; i
< originalData
.length
; i
++) {
2744 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2745 y
= originalData
[j
][1];
2746 if (y
=== null || isNaN(y
)) continue;
2748 sum
+= originalData
[j
][1];
2751 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2753 rollingData
[i
] = [originalData
[i
][0], null];
2758 for (i
= 0; i
< originalData
.length
; i
++) {
2762 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2763 y
= originalData
[j
][1][0];
2764 if (y
=== null || isNaN(y
)) continue;
2766 sum
+= originalData
[j
][1][0];
2767 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2770 stddev
= Math
.sqrt(variance
) / num_ok
;
2771 rollingData
[i
] = [originalData
[i
][0],
2772 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2774 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2784 * Detects the type of the str (date or numeric) and sets the various
2785 * formatting attributes in this.attrs_ based on this type.
2786 * @param {String} str An x value.
2789 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2791 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2792 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2793 str
.indexOf('/') >= 0 ||
2794 isNaN(parseFloat(str
))) {
2796 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2797 // TODO(danvk): remove support for this format.
2801 this.setXAxisOptions_(isDate
);
2804 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2806 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2807 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2808 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2809 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2811 /** @private (shut up, jsdoc!) */
2812 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2813 // TODO(danvk): use Dygraph.numberValueFormatter here?
2814 /** @private (shut up, jsdoc!) */
2815 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2816 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2817 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2822 * Parses the value as a floating point number. This is like the parseFloat()
2823 * built-in, but with a few differences:
2824 * - the empty string is parsed as null, rather than NaN.
2825 * - if the string cannot be parsed at all, an error is logged.
2826 * If the string can't be parsed, this method returns null.
2827 * @param {String} x The string to be parsed
2828 * @param {Number} opt_line_no The line number from which the string comes.
2829 * @param {String} opt_line The text of the line from which the string comes.
2833 // Parse the x as a float or return null if it's not a number.
2834 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2835 var val
= parseFloat(x
);
2836 if (!isNaN(val
)) return val
;
2838 // Try to figure out what happeend.
2839 // If the value is the empty string, parse it as null.
2840 if (/^ *$/.test(x
)) return null;
2842 // If it was actually "NaN", return it as NaN.
2843 if (/^ *nan *$/i.test(x
)) return NaN
;
2845 // Looks like a parsing error.
2846 var msg
= "Unable to parse '" + x
+ "' as a number";
2847 if (opt_line
!== null && opt_line_no
!== null) {
2848 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2857 * Parses a string in a special csv format. We expect a csv file where each
2858 * line is a date point, and the first field in each line is the date string.
2859 * We also expect that all remaining fields represent series.
2860 * if the errorBars attribute is set, then interpret the fields as:
2861 * date, series1, stddev1, series2, stddev2, ...
2862 * @param {[Object]} data See above.
2864 * @return [Object] An array with one entry for each row. These entries
2865 * are an array of cells in that row. The first entry is the parsed x-value for
2866 * the row. The second, third, etc. are the y-values. These can take on one of
2867 * three forms, depending on the CSV and constructor parameters:
2869 * 2. [ value, stddev ]
2870 * 3. [ low value, center value, high value ]
2872 Dygraph
.prototype.parseCSV_
= function(data
) {
2874 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2875 var lines
= data
.split(line_delimiter
|| "\n");
2878 // Use the default delimiter or fall back to a tab if that makes sense.
2879 var delim
= this.attr_('delimiter');
2880 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2885 if (!('labels' in this.user_attrs_
)) {
2886 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2888 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2889 this.attributes_
.reparseSeries();
2894 var defaultParserSet
= false; // attempt to auto-detect x value type
2895 var expectedCols
= this.attr_("labels").length
;
2896 var outOfOrder
= false;
2897 for (var i
= start
; i
< lines
.length
; i
++) {
2898 var line
= lines
[i
];
2900 if (line
.length
=== 0) continue; // skip blank lines
2901 if (line
[0] == '#') continue; // skip comment lines
2902 var inFields
= line
.split(delim
);
2903 if (inFields
.length
< 2) continue;
2906 if (!defaultParserSet
) {
2907 this.detectTypeFromString_(inFields
[0]);
2908 xParser
= this.attr_("xValueParser");
2909 defaultParserSet
= true;
2911 fields
[0] = xParser(inFields
[0], this);
2913 // If fractions are expected, parse the numbers as "A/B
"
2914 if (this.fractions_) {
2915 for (j = 1; j < inFields.length; j++) {
2916 // TODO(danvk): figure out an appropriate way to flag parse errors.
2917 vals = inFields[j].split("/");
2918 if (vals.length != 2) {
2919 this.error('Expected fractional "num
/den
" values in CSV data ' +
2920 "but found a value
'" + inFields[j] + "' on line
" +
2921 (1 + i) + " ('" + line + "') which is not of
this form
.");
2924 fields[j] = [this.parseFloat_(vals[0], i, line),
2925 this.parseFloat_(vals[1], i, line)];
2928 } else if (this.attr_("errorBars
")) {
2929 // If there are error bars, values are (value, stddev) pairs
2930 if (inFields.length % 2 != 1) {
2931 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2932 'but line ' + (1 + i) + ' has an odd number of values (' +
2933 (inFields.length - 1) + "): '" + line + "'");
2935 for (j = 1; j < inFields.length; j += 2) {
2936 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2937 this.parseFloat_(inFields[j + 1], i, line)];
2939 } else if (this.attr_("customBars
")) {
2940 // Bars are a low;center;high tuple
2941 for (j = 1; j < inFields.length; j++) {
2942 var val = inFields[j];
2943 if (/^ *$/.test(val)) {
2944 fields[j] = [null, null, null];
2946 vals = val.split(";");
2947 if (vals.length == 3) {
2948 fields[j] = [ this.parseFloat_(vals[0], i, line),
2949 this.parseFloat_(vals[1], i, line),
2950 this.parseFloat_(vals[2], i, line) ];
2952 this.warn('When using customBars, values must be either blank ' +
2953 'or "low
;center
;high
" tuples (got "' + val +
2954 '" on line ' + (1+i));
2959 // Values are just numbers
2960 for (j = 1; j < inFields.length; j++) {
2961 fields[j] = this.parseFloat_(inFields[j], i, line);
2964 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2968 if (fields.length != expectedCols) {
2969 this.error("Number of columns
in line
" + i + " (" + fields.length +
2970 ") does not agree
with number of
labels (" + expectedCols +
2974 // If the user specified the 'labels' option and none of the cells of the
2975 // first row parsed correctly, then they probably double-specified the
2976 // labels. We go with the values set in the option, discard this row and
2977 // log a warning to the JS console.
2978 if (i === 0 && this.attr_('labels')) {
2979 var all_null = true;
2980 for (j = 0; all_null && j < fields.length; j++) {
2981 if (fields[j]) all_null = false;
2984 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2985 "CSV
data ('" + line + "') appears to also contain labels
. " +
2986 "Will drop the CSV labels and
use the option labels
.");
2994 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2995 ret.sort(function(a,b) { return a[0] - b[0]; });
3003 * The user has provided their data as a pre-packaged JS array. If the x values
3004 * are numeric, this is the same as dygraphs' internal format. If the x values
3005 * are dates, we need to convert them from Date objects to ms since epoch.
3006 * @param {[Object]} data
3007 * @return {[Object]} data with numeric x values.
3009 Dygraph.prototype.parseArray_ = function(data) {
3010 // Peek at the first x value to see if it's numeric.
3011 if (data.length === 0) {
3012 this.error("Can
't plot empty data set");
3015 if (data[0].length === 0) {
3016 this.error("Data set cannot contain an empty row");
3021 if (this.attr_("labels") === null) {
3022 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3023 "in the options parameter");
3024 this.attrs_.labels = [ "X" ];
3025 for (i = 1; i < data[0].length; i++) {
3026 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3028 this.attributes_.reparseSeries();
3030 var num_labels = this.attr_("labels");
3031 if (num_labels.length != data[0].length) {
3032 this.error("Mismatch between number of labels (" + num_labels +
3033 ") and number of columns in array (" + data[0].length + ")");
3038 if (Dygraph.isDateLike(data[0][0])) {
3039 // Some intelligent defaults for a date x-axis.
3040 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3041 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3042 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3044 // Assume they're all dates
.
3045 var parsedData
= Dygraph
.clone(data
);
3046 for (i
= 0; i
< data
.length
; i
++) {
3047 if (parsedData
[i
].length
=== 0) {
3048 this.error("Row " + (1 + i
) + " of data is empty");
3051 if (parsedData
[i
][0] === null ||
3052 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3053 isNaN(parsedData
[i
][0].getTime())) {
3054 this.error("x value in row " + (1 + i
) + " is not a Date");
3057 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3061 // Some intelligent defaults for a numeric x-axis.
3062 /** @private (shut up, jsdoc!) */
3063 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3064 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3065 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3071 * Parses a DataTable object from gviz.
3072 * The data is expected to have a first column that is either a date or a
3073 * number. All subsequent columns must be numbers. If there is a clear mismatch
3074 * between this.xValueParser_ and the type of the first column, it will be
3075 * fixed. Fills out rawData_.
3076 * @param {[Object]} data See above.
3079 Dygraph
.prototype.parseDataTable_
= function(data
) {
3080 var shortTextForAnnotationNum
= function(num
) {
3081 // converts [0-9]+ [A-Z][a-z]*
3082 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3083 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3084 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3085 num
= Math
.floor(num
/ 26);
3087 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3088 num
= Math
.floor((num
- 1) / 26);
3093 var cols
= data
.getNumberOfColumns();
3094 var rows
= data
.getNumberOfRows();
3096 var indepType
= data
.getColumnType(0);
3097 if (indepType
== 'date' || indepType
== 'datetime') {
3098 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3099 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3100 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3101 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3102 } else if (indepType
== 'number') {
3103 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3104 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3105 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3106 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3108 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3109 "column 1 of DataTable input (Got '" + indepType
+ "')");
3113 // Array of the column indices which contain data (and not annotations).
3115 var annotationCols
= {}; // data index -> [annotation cols]
3116 var hasAnnotations
= false;
3118 for (i
= 1; i
< cols
; i
++) {
3119 var type
= data
.getColumnType(i
);
3120 if (type
== 'number') {
3122 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3123 // This is OK -- it's an annotation column.
3124 var dataIdx
= colIdx
[colIdx
.length
- 1];
3125 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3126 annotationCols
[dataIdx
] = [i
];
3128 annotationCols
[dataIdx
].push(i
);
3130 hasAnnotations
= true;
3132 this.error("Only 'number' is supported as a dependent type with Gviz." +
3133 " 'string' is only supported if displayAnnotations is true");
3137 // Read column labels
3138 // TODO(danvk): add support back for errorBars
3139 var labels
= [data
.getColumnLabel(0)];
3140 for (i
= 0; i
< colIdx
.length
; i
++) {
3141 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3142 if (this.attr_("errorBars")) i
+= 1;
3144 this.attrs_
.labels
= labels
;
3145 cols
= labels
.length
;
3148 var outOfOrder
= false;
3149 var annotations
= [];
3150 for (i
= 0; i
< rows
; i
++) {
3152 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3153 data
.getValue(i
, 0) === null) {
3154 this.warn("Ignoring row " + i
+
3155 " of DataTable because of undefined or null first column.");
3159 if (indepType
== 'date' || indepType
== 'datetime') {
3160 row
.push(data
.getValue(i
, 0).getTime());
3162 row
.push(data
.getValue(i
, 0));
3164 if (!this.attr_("errorBars")) {
3165 for (j
= 0; j
< colIdx
.length
; j
++) {
3166 var col
= colIdx
[j
];
3167 row
.push(data
.getValue(i
, col
));
3168 if (hasAnnotations
&&
3169 annotationCols
.hasOwnProperty(col
) &&
3170 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3172 ann
.series
= data
.getColumnLabel(col
);
3174 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3176 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3177 if (k
) ann
.text
+= "\n";
3178 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3180 annotations
.push(ann
);
3184 // Strip out infinities, which give dygraphs problems later on.
3185 for (j
= 0; j
< row
.length
; j
++) {
3186 if (!isFinite(row
[j
])) row
[j
] = null;
3189 for (j
= 0; j
< cols
- 1; j
++) {
3190 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3193 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3200 this.warn("DataTable is out of order; order it correctly to speed loading.");
3201 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3203 this.rawData_
= ret
;
3205 if (annotations
.length
> 0) {
3206 this.setAnnotations(annotations
, true);
3208 this.attributes_
.reparseSeries();
3212 * Get the CSV data. If it's in a function, call that function. If it's in a
3213 * file, do an XMLHttpRequest to get it.
3216 Dygraph
.prototype.start_
= function() {
3217 var data
= this.file_
;
3219 // Functions can return references of all other types.
3220 if (typeof data
== 'function') {
3224 if (Dygraph
.isArrayLike(data
)) {
3225 this.rawData_
= this.parseArray_(data
);
3227 } else if (typeof data
== 'object' &&
3228 typeof data
.getColumnRange
== 'function') {
3229 // must be a DataTable from gviz.
3230 this.parseDataTable_(data
);
3232 } else if (typeof data
== 'string') {
3233 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3234 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3235 if (line_delimiter
) {
3236 this.loadedEvent_(data
);
3238 var req
= new XMLHttpRequest();
3240 req
.onreadystatechange
= function () {
3241 if (req
.readyState
== 4) {
3242 if (req
.status
=== 200 || // Normal http
3243 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3244 caller
.loadedEvent_(req
.responseText
);
3249 req
.open("GET", data
, true);
3253 this.error("Unknown data format: " + (typeof data
));
3258 * Changes various properties of the graph. These can include:
3260 * <li>file: changes the source data for the graph</li>
3261 * <li>errorBars: changes whether the data contains stddev</li>
3264 * There's a huge variety of options that can be passed to this method. For a
3265 * full list, see http://dygraphs.com/options.html.
3267 * @param {Object} attrs The new properties and values
3268 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3269 * call to updateOptions(). If you know better, you can pass true to explicitly
3270 * block the redraw. This can be useful for chaining updateOptions() calls,
3271 * avoiding the occasional infinite loop and preventing redraws when it's not
3272 * necessary (e.g. when updating a callback).
3274 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3275 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3277 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3278 var file
= input_attrs
.file
;
3279 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3281 // TODO(danvk): this is a mess. Move these options into attr_.
3282 if ('rollPeriod' in attrs
) {
3283 this.rollPeriod_
= attrs
.rollPeriod
;
3285 if ('dateWindow' in attrs
) {
3286 this.dateWindow_
= attrs
.dateWindow
;
3287 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3288 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3291 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3292 this.zoomed_y_
= (attrs
.valueRange
!== null);
3295 // TODO(danvk): validate per-series options.
3300 // highlightCircleSize
3302 // Check if this set options will require new points.
3303 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3305 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3307 this.attributes_
.reparseSeries();
3311 if (!block_redraw
) this.start_();
3313 if (!block_redraw
) {
3314 if (requiresNewPoints
) {
3317 this.renderGraph_(false);
3324 * Returns a copy of the options with deprecated names converted into current
3325 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3326 * interested in that, they should save a copy before calling this.
3329 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3331 for (var k
in attrs
) {
3332 if (k
== 'file') continue;
3333 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3336 var set
= function(axis
, opt
, value
) {
3337 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3338 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3339 my_attrs
.axes
[axis
][opt
] = value
;
3341 var map
= function(opt
, axis
, new_opt
) {
3342 if (typeof(attrs
[opt
]) != 'undefined') {
3343 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3344 new_opt
+ " option for the " + axis
+ " axis instead. " +
3345 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3346 "(see http://dygraphs.com/per-axis.html for more information.");
3347 set(axis
, new_opt
, attrs
[opt
]);
3348 delete my_attrs
[opt
];
3352 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3353 map('xValueFormatter', 'x', 'valueFormatter');
3354 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3355 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3356 map('xTicker', 'x', 'ticker');
3357 map('yValueFormatter', 'y', 'valueFormatter');
3358 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3359 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3360 map('yTicker', 'y', 'ticker');
3365 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3366 * containing div (which has presumably changed size since the dygraph was
3367 * instantiated. If the width/height are specified, the div will be resized.
3369 * This is far more efficient than destroying and re-instantiating a
3370 * Dygraph, since it doesn't have to reparse the underlying data.
3372 * @param {Number} [width] Width (in pixels)
3373 * @param {Number} [height] Height (in pixels)
3375 Dygraph
.prototype.resize
= function(width
, height
) {
3376 if (this.resize_lock
) {
3379 this.resize_lock
= true;
3381 if ((width
=== null) != (height
=== null)) {
3382 this.warn("Dygraph.resize() should be called with zero parameters or " +
3383 "two non-NULL parameters. Pretending it was zero.");
3384 width
= height
= null;
3387 var old_width
= this.width_
;
3388 var old_height
= this.height_
;
3391 this.maindiv_
.style
.width
= width
+ "px";
3392 this.maindiv_
.style
.height
= height
+ "px";
3393 this.width_
= width
;
3394 this.height_
= height
;
3396 this.width_
= this.maindiv_
.clientWidth
;
3397 this.height_
= this.maindiv_
.clientHeight
;
3400 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3401 // TODO(danvk): there should be a clear() method.
3402 this.maindiv_
.innerHTML
= "";
3403 this.roller_
= null;
3404 this.attrs_
.labelsDiv
= null;
3405 this.createInterface_();
3406 if (this.annotations_
.length
) {
3407 // createInterface_ reset the layout, so we need to do this.
3408 this.layout_
.setAnnotations(this.annotations_
);
3410 this.createDragInterface_();
3414 this.resize_lock
= false;
3418 * Adjusts the number of points in the rolling average. Updates the graph to
3419 * reflect the new averaging period.
3420 * @param {Number} length Number of points over which to average the data.
3422 Dygraph
.prototype.adjustRoll
= function(length
) {
3423 this.rollPeriod_
= length
;
3428 * Returns a boolean array of visibility statuses.
3430 Dygraph
.prototype.visibility
= function() {
3431 // Do lazy-initialization, so that this happens after we know the number of
3433 if (!this.attr_("visibility")) {
3434 this.attrs_
.visibility
= [];
3436 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3437 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3438 this.attrs_
.visibility
.push(true);
3440 return this.attr_("visibility");
3444 * Changes the visiblity of a series.
3446 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3447 var x
= this.visibility();
3448 if (num
< 0 || num
>= x
.length
) {
3449 this.warn("invalid series number in setVisibility: " + num
);
3457 * How large of an area will the dygraph render itself in?
3458 * This is used for testing.
3459 * @return A {width: w, height: h} object.
3462 Dygraph
.prototype.size
= function() {
3463 return { width
: this.width_
, height
: this.height_
};
3467 * Update the list of annotations and redraw the chart.
3468 * See dygraphs.com/annotations.html for more info on how to use annotations.
3469 * @param ann {Array} An array of annotation objects.
3470 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3472 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3473 // Only add the annotation CSS rule once we know it will be used.
3474 Dygraph
.addAnnotationRule();
3475 this.annotations_
= ann
;
3476 this.layout_
.setAnnotations(this.annotations_
);
3477 if (!suppressDraw
) {
3483 * Return the list of annotations.
3485 Dygraph
.prototype.annotations
= function() {
3486 return this.annotations_
;
3490 * Get the list of label names for this graph. The first column is the
3491 * x-axis, so the data series names start at index 1.
3493 Dygraph
.prototype.getLabels
= function() {
3494 return this.attr_("labels").slice();
3498 * Get the index of a series (column) given its name. The first column is the
3499 * x-axis, so the data series start with index 1.
3501 Dygraph
.prototype.indexFromSetName
= function(name
) {
3502 return this.setIndexByName_
[name
];
3506 * Get the internal dataset index given its name. These are numbered starting from 0,
3507 * and only count visible sets.
3510 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3511 return this.datasetIndex_
[this.indexFromSetName(name
)];
3516 * Adds a default style for the annotation CSS classes to the document. This is
3517 * only executed when annotations are actually used. It is designed to only be
3518 * called once -- all calls after the first will return immediately.
3520 Dygraph
.addAnnotationRule
= function() {
3521 // TODO(danvk): move this function into plugins/annotations.js
?
3522 if (Dygraph
.addedAnnotationCSS
) return;
3524 var rule
= "border: 1px solid black; " +
3525 "background-color: white; " +
3526 "text-align: center;";
3528 var styleSheetElement
= document
.createElement("style");
3529 styleSheetElement
.type
= "text/css";
3530 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3532 // Find the first style sheet that we can access.
3533 // We may not add a rule to a style sheet from another domain for security
3534 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3535 // adds its own style sheets from google.com.
3536 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3537 if (document
.styleSheets
[i
].disabled
) continue;
3538 var mysheet
= document
.styleSheets
[i
];
3540 if (mysheet
.insertRule
) { // Firefox
3541 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3542 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3543 } else if (mysheet
.addRule
) { // IE
3544 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3546 Dygraph
.addedAnnotationCSS
= true;
3549 // Was likely a security exception.
3553 this.warn("Unable to add default annotation CSS rule; display may be off.");
3556 // Older pages may still use this name.
3557 var DateGraph
= Dygraph
;