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 DygraphRangeSelector:false, DygraphLayout:false, DygraphCanvasRenderer: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 Dygraph
.ANIMATION_STEPS
= 10;
95 Dygraph
.ANIMATION_DURATION
= 200;
97 // These are defined before DEFAULT_ATTRS so that it can refer to them.
100 * Return a string version of a number. This respects the digitsAfterDecimal
101 * and maxNumberWidth options.
102 * @param {Number} x The number to be formatted
103 * @param {Dygraph} opts An options view
104 * @param {String} name The name of the point's data series
105 * @param {Dygraph} g The dygraph object
107 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
108 var sigFigs
= opts('sigFigs');
110 if (sigFigs
!== null) {
111 // User has opted for a fixed number of significant figures.
112 return Dygraph
.floatFormat(x
, sigFigs
);
115 var digits
= opts('digitsAfterDecimal');
116 var maxNumberWidth
= opts('maxNumberWidth');
118 // switch to scientific notation if we underflow or overflow fixed display.
120 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
121 Math
.abs(x
) < Math
.pow(10, -digits
))) {
122 return x
.toExponential(digits
);
124 return '' + Dygraph
.round_(x
, digits
);
129 * variant for use as an axisLabelFormatter.
132 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
133 return Dygraph
.numberValueFormatter(x
, opts
, g
);
137 * Convert a JS date (millis since epoch) to YYYY/MM/DD
138 * @param {Number} date The JavaScript date (ms since epoch)
139 * @return {String} A date of the form "YYYY/MM/DD"
142 Dygraph
.dateString_
= function(date
) {
143 var zeropad
= Dygraph
.zeropad
;
144 var d
= new Date(date
);
147 var year
= "" + d
.getFullYear();
148 // Get a 0 padded month string
149 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
150 // Get a 0 padded day string
151 var day
= zeropad(d
.getDate());
154 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
155 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
157 return year
+ "/" + month + "/" + day
+ ret
;
161 * Convert a JS date to a string appropriate to display on an axis that
162 * is displaying values at the stated granularity.
163 * @param {Date} date The date to format
164 * @param {Number} granularity One of the Dygraph granularity constants
165 * @return {String} The formatted date
168 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
169 if (granularity
>= Dygraph
.DECADAL
) {
170 return date
.strftime('%Y');
171 } else if (granularity
>= Dygraph
.MONTHLY
) {
172 return date
.strftime('%b %y');
174 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
175 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
176 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
178 return Dygraph
.hmsString_(date
.getTime());
184 * Standard plotters. These may be used by clients.
185 * Available plotters are:
186 * - Dygraph.Plotters.linePlotter: draws central lines (most common)
187 * - Dygraph.Plotters.errorPlotter: draws error bars
188 * - Dygraph.Plotters.fillPlotter: draws fills under lines (used with fillGraph)
190 * By default, the plotter is [fillPlotter, errorPlotter, linePlotter].
191 * This causes all the lines to be drawn over all the fills/error bars.
193 Dygraph
.Plotters
= DygraphCanvasRenderer
._Plotters
;
196 // Default attribute values.
197 Dygraph
.DEFAULT_ATTRS
= {
198 highlightCircleSize
: 3,
199 highlightSeriesOpts
: null,
200 highlightSeriesBackgroundAlpha
: 0.5,
204 // TODO(danvk): move defaults from createStatusMessage_ here.
206 labelsSeparateLines
: false,
207 labelsShowZeroValues
: true,
210 showLabelsOnHighlight
: true,
212 digitsAfterDecimal
: 2,
217 strokeBorderWidth
: 0,
218 strokeBorderColor
: "white",
221 axisLabelFontSize
: 14,
227 xValueParser
: Dygraph
.dateParser
,
234 wilsonInterval
: true, // only relevant if fractions is true
238 connectSeparatedPoints
: false,
241 hideOverlayOnMouseOut
: true,
243 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
244 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
248 drawAxesAtZero
: false,
250 // Sizes of the various chart labels.
257 axisLineColor
: "black",
260 axisLabelColor
: "black",
261 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
265 gridLineColor
: "rgb(128,128,128)",
267 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
268 animatedZooms
: false, // (for now)
270 // Range selector options
271 showRangeSelector
: false,
272 rangeSelectorHeight
: 40,
273 rangeSelectorPlotStrokeColor
: "#808FAB",
274 rangeSelectorPlotFillColor
: "#A7B1C4",
276 // The ordering here ensures that central lines always appear above any
277 // fill bars/error bars
.
279 Dygraph
.Plotters
.fillPlotter
,
280 Dygraph
.Plotters
.errorPlotter
,
281 Dygraph
.Plotters
.linePlotter
288 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
289 valueFormatter
: Dygraph
.dateString_
,
290 ticker
: null // will be set in dygraph-tickers.js
294 valueFormatter
: Dygraph
.numberValueFormatter
,
295 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
296 ticker
: null // will be set in dygraph-tickers.js
300 valueFormatter
: Dygraph
.numberValueFormatter
,
301 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
302 ticker
: null // will be set in dygraph-tickers.js
307 // Directions for panning and zooming. Use bit operations when combined
308 // values are possible.
309 Dygraph
.HORIZONTAL
= 1;
310 Dygraph
.VERTICAL
= 2;
312 // Installed plugins, in order of precedence (most-general to most-specific).
313 // Plugins are installed after they are defined, in plugins/install.js
.
317 // Used for initializing annotation CSS rules only once.
318 Dygraph
.addedAnnotationCSS
= false;
320 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
321 // Labels is no longer a constructor parameter, since it's typically set
322 // directly from the data source. It also conains a name for the x-axis,
323 // which the previous constructor form did not.
324 if (labels
!== null) {
325 var new_labels
= ["Date"];
326 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
327 Dygraph
.update(attrs
, { 'labels': new_labels
});
329 this.__init__(div
, file
, attrs
);
333 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
334 * and context <canvas> inside of it. See the constructor for details.
336 * @param {Element} div the Element to render the graph into.
337 * @param {String | Function} file Source data
338 * @param {Object} attrs Miscellaneous other options
341 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
342 // Hack for IE: if we're using excanvas and the document hasn't finished
343 // loading yet (and hence may not have initialized whatever it needs to
344 // initialize), then keep calling this routine periodically until it has.
345 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
346 typeof(G_vmlCanvasManager
) != 'undefined' &&
347 document
.readyState
!= 'complete') {
349 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
353 // Support two-argument constructor
354 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
356 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
359 Dygraph
.error("Constructing dygraph with a non-existent div!");
363 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
365 // Copy the important bits into the object
366 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
369 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
370 this.previousVerticalX_
= -1;
371 this.fractions_
= attrs
.fractions
|| false;
372 this.dateWindow_
= attrs
.dateWindow
|| null;
374 this.is_initial_draw_
= true;
375 this.annotations_
= [];
377 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
378 this.zoomed_x_
= false;
379 this.zoomed_y_
= false;
381 // Clear the div. This ensure that, if multiple dygraphs are passed the same
382 // div, then only one will be drawn.
385 // For historical reasons, the 'width' and 'height' options trump all CSS
386 // rules _except_ for an explicit 'width' or 'height' on the div.
387 // As an added convenience, if the div has zero height (like <div></div> does
388 // without any styles), then we use a default height/width
.
389 if (div
.style
.width
=== '' && attrs
.width
) {
390 div
.style
.width
= attrs
.width
+ "px";
392 if (div
.style
.height
=== '' && attrs
.height
) {
393 div
.style
.height
= attrs
.height
+ "px";
395 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
396 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
397 if (div
.style
.width
=== '') {
398 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
401 // these will be zero if the dygraph's div is hidden.
402 this.width_
= div
.clientWidth
;
403 this.height_
= div
.clientHeight
;
405 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
406 if (attrs
.stackedGraph
) {
407 attrs
.fillGraph
= true;
408 // TODO(nikhilk): Add any other stackedGraph checks here.
411 // Dygraphs has many options, some of which interact with one another.
412 // To keep track of everything, we maintain two sets of options:
414 // this.user_attrs_ only options explicitly set by the user.
415 // this.attrs_ defaults, options derived from user_attrs_, data.
417 // Options are then accessed this.attr_('attr'), which first looks at
418 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
419 // defaults without overriding behavior that the user specifically asks for.
420 this.user_attrs_
= {};
421 Dygraph
.update(this.user_attrs_
, attrs
);
423 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
425 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
427 this.boundaryIds_
= [];
428 this.setIndexByName_
= {};
429 this.datasetIndex_
= [];
431 this.registeredEvents_
= [];
432 this.eventListeners_
= {};
434 // Create the containing DIV and other interactive elements
435 this.createInterface_();
439 for (var i
= 0; i
< Dygraph
.PLUGINS
.length
; i
++) {
440 var Plugin
= Dygraph
.PLUGINS
[i
];
441 var pluginInstance
= new Plugin();
443 plugin
: pluginInstance
,
449 var handlers
= pluginInstance
.activate(this);
450 for (var eventName
in handlers
) {
451 // TODO(danvk): validate eventName.
452 pluginDict
.events
[eventName
] = handlers
[eventName
];
455 this.plugins_
.push(pluginDict
);
458 // At this point, plugins can no longer register event handlers.
459 // Construct a map from event -> ordered list of [callback, plugin].
460 for (var i
= 0; i
< this.plugins_
.length
; i
++) {
461 var plugin_dict
= this.plugins_
[i
];
462 for (var eventName
in plugin_dict
.events
) {
463 if (!plugin_dict
.events
.hasOwnProperty(eventName
)) continue;
464 var callback
= plugin_dict
.events
[eventName
];
466 var pair
= [plugin_dict
.plugin
, callback
];
467 if (!(eventName
in this.eventListeners_
)) {
468 this.eventListeners_
[eventName
] = [pair
];
470 this.eventListeners_
[eventName
].push(pair
);
479 * Triggers a cascade of events to the various plugins which are interested in them.
480 * Returns true if the "default behavior" should be performed, i.e. if none of
481 * the event listeners called event.preventDefault().
484 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
485 if (!(name
in this.eventListeners_
)) return true;
487 // QUESTION: can we use objects & prototypes to speed this up?
491 defaultPrevented
: false,
492 preventDefault
: function() {
493 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
494 e
.defaultPrevented
= true;
496 propagationStopped
: false,
497 stopPropagation
: function() {
498 e
.propagationStopped
= true;
501 Dygraph
.update(e
, extra_props
);
503 var callback_plugin_pairs
= this.eventListeners_
[name
];
504 if (callback_plugin_pairs
) {
505 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
506 var plugin
= callback_plugin_pairs
[i
][0];
507 var callback
= callback_plugin_pairs
[i
][1];
508 callback
.call(plugin
, e
);
509 if (e
.propagationStopped
) break;
512 return e
.defaultPrevented
;
516 * Returns the zoomed status of the chart for one or both axes.
518 * Axis is an optional parameter. Can be set to 'x' or 'y'.
520 * The zoomed status for an axis is set whenever a user zooms using the mouse
521 * or when the dateWindow or valueRange are updated (unless the
522 * isZoomedIgnoreProgrammaticZoom option is also specified).
524 Dygraph
.prototype.isZoomed
= function(axis
) {
525 if (axis
=== null || axis
=== undefined
) {
526 return this.zoomed_x_
|| this.zoomed_y_
;
528 if (axis
=== 'x') return this.zoomed_x_
;
529 if (axis
=== 'y') return this.zoomed_y_
;
530 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
534 * Returns information about the Dygraph object, including its containing ID.
536 Dygraph
.prototype.toString
= function() {
537 var maindiv
= this.maindiv_
;
538 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
539 return "[Dygraph " + id
+ "]";
544 * Returns the value of an option. This may be set by the user (either in the
545 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
547 * @param { String } name The name of the option, e.g. 'rollPeriod'.
548 * @param { String } [seriesName] The name of the series to which the option
549 * will be applied. If no per-series value of this option is available, then
550 * the global value is returned. This is optional.
551 * @return { ... } The value of the option.
553 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
554 // <REMOVE_FOR_COMBINED>
555 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
556 this.error('Must include options reference JS for testing');
557 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
558 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
559 'in the Dygraphs.OPTIONS_REFERENCE listing.');
560 // Only log this error once.
561 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
563 // </REMOVE_FOR_COMBINED
>
566 sources
.push(this.attrs_
);
567 if (this.user_attrs_
) {
568 sources
.push(this.user_attrs_
);
570 if (this.user_attrs_
.hasOwnProperty(seriesName
)) {
571 sources
.push(this.user_attrs_
[seriesName
]);
573 if (seriesName
=== this.highlightSet_
&&
574 this.user_attrs_
.hasOwnProperty('highlightSeriesOpts')) {
575 sources
.push(this.user_attrs_
.highlightSeriesOpts
);
581 for (var i
= sources
.length
- 1; i
>= 0; --i
) {
582 var source
= sources
[i
];
583 if (source
.hasOwnProperty(name
)) {
592 * Returns the current value for an option, as set in the constructor or via
593 * updateOptions. You may pass in an (optional) series name to get per-series
594 * values for the option.
596 * All values returned by this method should be considered immutable. If you
597 * modify them, there is no guarantee that the changes will be honored or that
598 * dygraphs will remain in a consistent state. If you want to modify an option,
599 * use updateOptions() instead.
601 * @param { String } name The name of the option (e.g. 'strokeWidth')
602 * @param { String } [opt_seriesName] Series name to get per-series values.
603 * @return { ... } The value of the option.
605 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
606 return this.attr_(name
, opt_seriesName
);
611 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
612 * @return { ... } A function mapping string -> option value
614 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
616 return function(opt
) {
617 var axis_opts
= self
.user_attrs_
.axes
;
618 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
619 return axis_opts
[axis
][opt
];
621 // user-specified attributes always trump defaults, even if they're less
623 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
624 return self
.user_attrs_
[opt
];
627 axis_opts
= self
.attrs_
.axes
;
628 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
629 return axis_opts
[axis
][opt
];
631 // check old-style axis options
632 // TODO(danvk): add a deprecation warning if either of these match.
633 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
634 return self
.axes_
[0][opt
];
635 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
636 return self
.axes_
[1][opt
];
638 return self
.attr_(opt
);
643 * Returns the current rolling period, as set by the user or an option.
644 * @return {Number} The number of points in the rolling window
646 Dygraph
.prototype.rollPeriod
= function() {
647 return this.rollPeriod_
;
651 * Returns the currently-visible x-range. This can be affected by zooming,
652 * panning or a call to updateOptions.
653 * Returns a two-element array: [left, right].
654 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
656 Dygraph
.prototype.xAxisRange
= function() {
657 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
661 * Returns the lower- and upper-bound x-axis values of the
664 Dygraph
.prototype.xAxisExtremes
= function() {
665 var left
= this.rawData_
[0][0];
666 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
667 return [left
, right
];
671 * Returns the currently-visible y-range for an axis. This can be affected by
672 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
673 * called with no arguments, returns the range of the first axis.
674 * Returns a two-element array: [bottom, top].
676 Dygraph
.prototype.yAxisRange
= function(idx
) {
677 if (typeof(idx
) == "undefined") idx
= 0;
678 if (idx
< 0 || idx
>= this.axes_
.length
) {
681 var axis
= this.axes_
[idx
];
682 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
686 * Returns the currently-visible y-ranges for each axis. This can be affected by
687 * zooming, panning, calls to updateOptions, etc.
688 * Returns an array of [bottom, top] pairs, one for each y-axis.
690 Dygraph
.prototype.yAxisRanges
= function() {
692 for (var i
= 0; i
< this.axes_
.length
; i
++) {
693 ret
.push(this.yAxisRange(i
));
698 // TODO(danvk): use these functions throughout dygraphs.
700 * Convert from data coordinates to canvas/div X/Y coordinates.
701 * If specified, do this conversion for the coordinate system of a particular
702 * axis. Uses the first axis by default.
703 * Returns a two-element array: [X, Y]
705 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
706 * instead of toDomCoords(null, y, axis).
708 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
709 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
713 * Convert from data x coordinates to canvas/div X coordinate.
714 * If specified, do this conversion for the coordinate system of a particular
716 * Returns a single value or null if x is null.
718 Dygraph
.prototype.toDomXCoord
= function(x
) {
723 var area
= this.plotter_
.area
;
724 var xRange
= this.xAxisRange();
725 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
729 * Convert from data x coordinates to canvas/div Y coordinate and optional
730 * axis. Uses the first axis by default.
732 * returns a single value or null if y is null.
734 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
735 var pct
= this.toPercentYCoord(y
, axis
);
740 var area
= this.plotter_
.area
;
741 return area
.y
+ pct
* area
.h
;
745 * Convert from canvas/div coords to data coordinates.
746 * If specified, do this conversion for the coordinate system of a particular
747 * axis. Uses the first axis by default.
748 * Returns a two-element array: [X, Y].
750 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
751 * instead of toDataCoords(null, y, axis).
753 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
754 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
758 * Convert from canvas/div x coordinate to data coordinate.
760 * If x is null, this returns null.
762 Dygraph
.prototype.toDataXCoord
= function(x
) {
767 var area
= this.plotter_
.area
;
768 var xRange
= this.xAxisRange();
769 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
773 * Convert from canvas/div y coord to value.
775 * If y is null, this returns null.
776 * if axis is null, this uses the first axis.
778 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
783 var area
= this.plotter_
.area
;
784 var yRange
= this.yAxisRange(axis
);
786 if (typeof(axis
) == "undefined") axis
= 0;
787 if (!this.axes_
[axis
].logscale
) {
788 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
790 // Computing the inverse of toDomCoord.
791 var pct
= (y
- area
.y
) / area
.h
;
793 // Computing the inverse of toPercentYCoord. The function was arrived at with
794 // the following steps:
796 // Original calcuation:
797 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
799 // Move denominator to both sides:
800 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
802 // subtract logr1, and take the negative value.
803 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
805 // Swap both sides of the equation, and we can compute the log of the
806 // return value. Which means we just need to use that as the exponent in
808 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
810 var logr1
= Dygraph
.log10(yRange
[1]);
811 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
812 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
818 * Converts a y for an axis to a percentage from the top to the
819 * bottom of the drawing area.
821 * If the coordinate represents a value visible on the canvas, then
822 * the value will be between 0 and 1, where 0 is the top of the canvas.
823 * However, this method will return values outside the range, as
824 * values can fall outside the canvas.
826 * If y is null, this returns null.
827 * if axis is null, this uses the first axis.
829 * @param { Number } y The data y-coordinate.
830 * @param { Number } [axis] The axis number on which the data coordinate lives.
831 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
833 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
837 if (typeof(axis
) == "undefined") axis
= 0;
839 var yRange
= this.yAxisRange(axis
);
842 if (!this.axes_
[axis
].logscale
) {
843 // yRange[1] - y is unit distance from the bottom.
844 // yRange[1] - yRange[0] is the scale of the range.
845 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
846 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
848 var logr1
= Dygraph
.log10(yRange
[1]);
849 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
855 * Converts an x value to a percentage from the left to the right of
858 * If the coordinate represents a value visible on the canvas, then
859 * the value will be between 0 and 1, where 0 is the left of the canvas.
860 * However, this method will return values outside the range, as
861 * values can fall outside the canvas.
863 * If x is null, this returns null.
864 * @param { Number } x The data x-coordinate.
865 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
867 Dygraph
.prototype.toPercentXCoord
= function(x
) {
872 var xRange
= this.xAxisRange();
873 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
877 * Returns the number of columns (including the independent variable).
878 * @return { Integer } The number of columns.
880 Dygraph
.prototype.numColumns
= function() {
881 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
885 * Returns the number of rows (excluding any header/label row).
886 * @return { Integer } The number of rows, less any header.
888 Dygraph
.prototype.numRows
= function() {
889 return this.rawData_
.length
;
893 * Returns the full range of the x-axis, as determined by the most extreme
894 * values in the data set. Not affected by zooming, visibility, etc.
895 * TODO(danvk): merge w/ xAxisExtremes
896 * @return { Array<Number> } A [low, high] pair
899 Dygraph
.prototype.fullXRange_
= function() {
900 if (this.numRows() > 0) {
901 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
908 * Returns the value in the given row and column. If the row and column exceed
909 * the bounds on the data, returns null. Also returns null if the value is
911 * @param { Number} row The row number of the data (0-based). Row 0 is the
912 * first row of data, not a header row.
913 * @param { Number} col The column number of the data (0-based)
914 * @return { Number } The value in the specified cell or null if the row/col
917 Dygraph
.prototype.getValue
= function(row
, col
) {
918 if (row
< 0 || row
> this.rawData_
.length
) return null;
919 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
921 return this.rawData_
[row
][col
];
925 * Generates interface elements for the Dygraph: a containing div, a div to
926 * display the current point, and a textbox to adjust the rolling average
927 * period. Also creates the Renderer/Layout elements.
930 Dygraph
.prototype.createInterface_
= function() {
931 // Create the all-enclosing graph div
932 var enclosing
= this.maindiv_
;
934 this.graphDiv
= document
.createElement("div");
935 this.graphDiv
.style
.width
= this.width_
+ "px";
936 this.graphDiv
.style
.height
= this.height_
+ "px";
937 enclosing
.appendChild(this.graphDiv
);
939 // Create the canvas for interactive parts of the chart.
940 this.canvas_
= Dygraph
.createCanvas();
941 this.canvas_
.style
.position
= "absolute";
942 this.canvas_
.width
= this.width_
;
943 this.canvas_
.height
= this.height_
;
944 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
945 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
947 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
949 // ... and for static parts of the chart.
950 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
951 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
953 if (this.attr_('showRangeSelector')) {
954 // The range selector must be created here so that its canvases and contexts get created here.
955 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
956 this.rangeSelector_
= new DygraphRangeSelector(this);
959 // The interactive parts of the graph are drawn on top of the chart.
960 this.graphDiv
.appendChild(this.hidden_
);
961 this.graphDiv
.appendChild(this.canvas_
);
962 this.mouseEventElement_
= this.createMouseEventElement_();
964 // Create the grapher
965 this.layout_
= new DygraphLayout(this);
967 if (this.rangeSelector_
) {
968 // This needs to happen after the graph canvases are added to the div and the layout object is created.
969 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
974 this.mouseMoveHandler
= function(e
) {
975 dygraph
.mouseMove_(e
);
977 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
979 this.mouseOutHandler
= function(e
) {
980 dygraph
.mouseOut_(e
);
982 this.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
984 this.createDragInterface_();
986 this.resizeHandler
= function(e
) {
990 // Update when the window is resized.
991 // TODO(danvk): drop frames depending on complexity of the chart.
992 this.addEvent(window
, 'resize', this.resizeHandler
);
996 * Detach DOM elements in the dygraph and null out all data references.
997 * Calling this when you're done with a dygraph can dramatically reduce memory
998 * usage. See, e.g., the tests/perf.html example.
1000 Dygraph
.prototype.destroy
= function() {
1001 var removeRecursive
= function(node
) {
1002 while (node
.hasChildNodes()) {
1003 removeRecursive(node
.firstChild
);
1004 node
.removeChild(node
.firstChild
);
1008 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
1009 var reg
= this.registeredEvents_
[idx
];
1010 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
1012 this.registeredEvents_
= [];
1014 // remove mouse event handlers (This may not be necessary anymore)
1015 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
1016 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
1017 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
1018 removeRecursive(this.maindiv_
);
1020 var nullOut
= function(obj
) {
1021 for (var n
in obj
) {
1022 if (typeof(obj
[n
]) === 'object') {
1027 // remove event handlers
1028 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
1029 this.resizeHandler
= null;
1030 // These may not all be necessary, but it can't hurt...
1031 nullOut(this.layout_
);
1032 nullOut(this.plotter_
);
1037 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1038 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1039 * or the zoom rectangles) is done on this.canvas_.
1040 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1041 * @return {Object} The newly-created canvas
1044 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1045 var h
= Dygraph
.createCanvas();
1046 h
.style
.position
= "absolute";
1047 // TODO(danvk): h should be offset from canvas. canvas needs to include
1048 // some extra area to make it easier to zoom in on the far left and far
1049 // right. h needs to be precisely the plot area, so that clipping occurs.
1050 h
.style
.top
= canvas
.style
.top
;
1051 h
.style
.left
= canvas
.style
.left
;
1052 h
.width
= this.width_
;
1053 h
.height
= this.height_
;
1054 h
.style
.width
= this.width_
+ "px"; // for IE
1055 h
.style
.height
= this.height_
+ "px"; // for IE
1060 * Creates an overlay element used to handle mouse events.
1061 * @return {Object} The mouse event element.
1064 Dygraph
.prototype.createMouseEventElement_
= function() {
1065 if (this.isUsingExcanvas_
) {
1066 var elem
= document
.createElement("div");
1067 elem
.style
.position
= 'absolute';
1068 elem
.style
.backgroundColor
= 'white';
1069 elem
.style
.filter
= 'alpha(opacity=0)';
1070 elem
.style
.width
= this.width_
+ "px";
1071 elem
.style
.height
= this.height_
+ "px";
1072 this.graphDiv
.appendChild(elem
);
1075 return this.canvas_
;
1080 * Generate a set of distinct colors for the data series. This is done with a
1081 * color wheel. Saturation/Value are customizable, and the hue is
1082 * equally-spaced around the color wheel. If a custom set of colors is
1083 * specified, that is used instead.
1086 Dygraph
.prototype.setColors_
= function() {
1087 var labels
= this.getLabels();
1088 var num
= labels
.length
- 1;
1090 this.colorsMap_
= {};
1091 var colors
= this.attr_('colors');
1094 var sat
= this.attr_('colorSaturation') || 1.0;
1095 var val
= this.attr_('colorValue') || 0.5;
1096 var half
= Math
.ceil(num
/ 2);
1097 for (i
= 1; i
<= num
; i
++) {
1098 if (!this.visibility()[i
-1]) continue;
1099 // alternate colors for high contrast.
1100 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1101 var hue
= (1.0 * idx
/ (1 + num
));
1102 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1103 this.colors_
.push(colorStr
);
1104 this.colorsMap_
[labels
[i
]] = colorStr
;
1107 for (i
= 0; i
< num
; i
++) {
1108 if (!this.visibility()[i
]) continue;
1109 var colorStr
= colors
[i
% colors
.length
];
1110 this.colors_
.push(colorStr
);
1111 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1117 * Return the list of colors. This is either the list of colors passed in the
1118 * attributes or the autogenerated list of rgb(r,g,b) strings.
1119 * This does not return colors for invisible series.
1120 * @return {Array<string>} The list of colors.
1122 Dygraph
.prototype.getColors
= function() {
1123 return this.colors_
;
1127 * Returns a few attributes of a series, i.e. its color, its visibility, which
1128 * axis it's assigned to, and its column in the original data.
1129 * Returns null if the series does not exist.
1130 * Otherwise, returns an object with column, visibility, color and axis properties.
1131 * The "axis" property will be set to 1 for y1 and 2 for y2.
1132 * The "column" property can be fed back into getValue(row, column) to get
1133 * values for this series.
1135 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1137 var labels
= this.getLabels();
1138 for (var i
= 1; i
< labels
.length
; i
++) {
1139 if (labels
[i
] == series_name
) {
1144 if (idx
== -1) return null;
1149 visible
: this.visibility()[idx
- 1],
1150 color
: this.colorsMap_
[series_name
],
1151 axis
: 1 + this.seriesToAxisMap_
[series_name
]
1156 * Create the text box to adjust the averaging period
1159 Dygraph
.prototype.createRollInterface_
= function() {
1160 // Create a roller if one doesn't exist already.
1161 if (!this.roller_
) {
1162 this.roller_
= document
.createElement("input");
1163 this.roller_
.type
= "text";
1164 this.roller_
.style
.display
= "none";
1165 this.graphDiv
.appendChild(this.roller_
);
1168 var display
= this.attr_('showRoller') ? 'block' : 'none';
1170 var area
= this.plotter_
.area
;
1171 var textAttr
= { "position": "absolute",
1173 "top": (area
.y
+ area
.h
- 25) + "px",
1174 "left": (area
.x
+ 1) + "px",
1177 this.roller_
.size
= "2";
1178 this.roller_
.value
= this.rollPeriod_
;
1179 for (var name
in textAttr
) {
1180 if (textAttr
.hasOwnProperty(name
)) {
1181 this.roller_
.style
[name
] = textAttr
[name
];
1186 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1191 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1192 * canvas (i.e. DOM Coords).
1194 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1195 return Dygraph
.pageX(e
) - context
.px
;
1200 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1201 * canvas (i.e. DOM Coords).
1203 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1204 return Dygraph
.pageY(e
) - context
.py
;
1208 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1212 Dygraph
.prototype.createDragInterface_
= function() {
1214 // Tracks whether the mouse is down right now
1216 isPanning
: false, // is this drag part of a pan?
1217 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1218 dragStartX
: null, // pixel coordinates
1219 dragStartY
: null, // pixel coordinates
1220 dragEndX
: null, // pixel coordinates
1221 dragEndY
: null, // pixel coordinates
1222 dragDirection
: null,
1223 prevEndX
: null, // pixel coordinates
1224 prevEndY
: null, // pixel coordinates
1225 prevDragDirection
: null,
1226 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1228 // The value on the left side of the graph when a pan operation starts.
1229 initialLeftmostDate
: null,
1231 // The number of units each pixel spans. (This won't be valid for log
1233 xUnitsPerPixel
: null,
1235 // TODO(danvk): update this comment
1236 // The range in second/value units that the viewport encompasses during a
1237 // panning operation.
1240 // Top-left corner of the canvas, in DOM coords
1241 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1245 // Values for use with panEdgeFraction, which limit how far outside the
1246 // graph's data boundaries it can be panned.
1247 boundedDates
: null, // [minDate, maxDate]
1248 boundedValues
: null, // [[minValue, maxValue] ...]
1250 // contextB is the same thing as this context object but renamed.
1251 initializeMouseDown
: function(event
, g
, contextB
) {
1252 // prevents mouse drags from selecting page text.
1253 if (event
.preventDefault
) {
1254 event
.preventDefault(); // Firefox, Chrome, etc.
1256 event
.returnValue
= false; // IE
1257 event
.cancelBubble
= true;
1260 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1261 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1262 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1263 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1264 contextB
.cancelNextDblclick
= false;
1268 var interactionModel
= this.attr_("interactionModel");
1270 // Self is the graph.
1273 // Function that binds the graph and context to the handler.
1274 var bindHandler
= function(handler
) {
1275 return function(event
) {
1276 handler(event
, self
, context
);
1280 for (var eventName
in interactionModel
) {
1281 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1282 this.addEvent(this.mouseEventElement_
, eventName
,
1283 bindHandler(interactionModel
[eventName
]));
1286 // If the user releases the mouse button during a drag, but not over the
1287 // canvas, then it doesn't count as a zooming action.
1288 this.mouseUpHandler_
= function(event
) {
1289 if (context
.isZooming
|| context
.isPanning
) {
1290 context
.isZooming
= false;
1291 context
.dragStartX
= null;
1292 context
.dragStartY
= null;
1295 if (context
.isPanning
) {
1296 context
.isPanning
= false;
1297 context
.draggingDate
= null;
1298 context
.dateRange
= null;
1299 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1300 delete self
.axes_
[i
].draggingValue
;
1301 delete self
.axes_
[i
].dragValueRange
;
1306 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1310 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1311 * up any previous zoom rectangles that were drawn. This could be optimized to
1312 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1315 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1316 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1317 * @param {Number} startX The X position where the drag started, in canvas
1319 * @param {Number} endX The current X position of the drag, in canvas coords.
1320 * @param {Number} startY The Y position where the drag started, in canvas
1322 * @param {Number} endY The current Y position of the drag, in canvas coords.
1323 * @param {Number} prevDirection the value of direction on the previous call to
1324 * this function. Used to avoid excess redrawing
1325 * @param {Number} prevEndX The value of endX on the previous call to this
1326 * function. Used to avoid excess redrawing
1327 * @param {Number} prevEndY The value of endY on the previous call to this
1328 * function. Used to avoid excess redrawing
1331 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1332 endY
, prevDirection
, prevEndX
,
1334 var ctx
= this.canvas_ctx_
;
1336 // Clean up from the previous rect if necessary
1337 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1338 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1339 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1340 } else if (prevDirection
== Dygraph
.VERTICAL
){
1341 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1342 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1345 // Draw a light-grey rectangle to show the new viewing area
1346 if (direction
== Dygraph
.HORIZONTAL
) {
1347 if (endX
&& startX
) {
1348 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1349 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1350 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1352 } else if (direction
== Dygraph
.VERTICAL
) {
1353 if (endY
&& startY
) {
1354 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1355 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1356 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1360 if (this.isUsingExcanvas_
) {
1361 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1366 * Clear the zoom rectangle (and perform no zoom).
1369 Dygraph
.prototype.clearZoomRect_
= function() {
1370 this.currentZoomRectArgs_
= null;
1371 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1375 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1376 * the canvas. The exact zoom window may be slightly larger if there are no data
1377 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1378 * which accepts dates that match the raw data. This function redraws the graph.
1380 * @param {Number} lowX The leftmost pixel value that should be visible.
1381 * @param {Number} highX The rightmost pixel value that should be visible.
1384 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1385 this.currentZoomRectArgs_
= null;
1386 // Find the earliest and latest dates contained in this canvasx range.
1387 // Convert the call to date ranges of the raw data.
1388 var minDate
= this.toDataXCoord(lowX
);
1389 var maxDate
= this.toDataXCoord(highX
);
1390 this.doZoomXDates_(minDate
, maxDate
);
1394 * Transition function to use in animations. Returns values between 0.0
1395 * (totally old values) and 1.0 (totally new values) for each frame.
1398 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1400 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1404 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1405 * method with doZoomX which accepts pixel coordinates. This function redraws
1408 * @param {Number} minDate The minimum date that should be visible.
1409 * @param {Number} maxDate The maximum date that should be visible.
1412 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1413 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1414 // can produce strange effects. Rather than the y-axis transitioning slowly
1415 // between values, it can jerk around.)
1416 var old_window
= this.xAxisRange();
1417 var new_window
= [minDate
, maxDate
];
1418 this.zoomed_x_
= true;
1420 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1421 if (that
.attr_("zoomCallback")) {
1422 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1428 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1429 * the canvas. This function redraws the graph.
1431 * @param {Number} lowY The topmost pixel value that should be visible.
1432 * @param {Number} highY The lowest pixel value that should be visible.
1435 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1436 this.currentZoomRectArgs_
= null;
1437 // Find the highest and lowest values in pixel range for each axis.
1438 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1439 // This is because pixels increase as you go down on the screen, whereas data
1440 // coordinates increase as you go up the screen.
1441 var oldValueRanges
= this.yAxisRanges();
1442 var newValueRanges
= [];
1443 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1444 var hi
= this.toDataYCoord(lowY
, i
);
1445 var low
= this.toDataYCoord(highY
, i
);
1446 newValueRanges
.push([low
, hi
]);
1449 this.zoomed_y_
= true;
1451 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1452 if (that
.attr_("zoomCallback")) {
1453 var xRange
= that
.xAxisRange();
1454 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1460 * Reset the zoom to the original view coordinates. This is the same as
1461 * double-clicking on the graph.
1465 Dygraph
.prototype.doUnzoom_
= function() {
1466 var dirty
= false, dirtyX
= false, dirtyY
= false;
1467 if (this.dateWindow_
!== null) {
1472 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1473 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1479 // Clear any selection, since it's likely to be drawn in the wrong place.
1480 this.clearSelection();
1483 this.zoomed_x_
= false;
1484 this.zoomed_y_
= false;
1486 var minDate
= this.rawData_
[0][0];
1487 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1489 // With only one frame, don't bother calculating extreme ranges.
1490 // TODO(danvk): merge this block w/ the code below
.
1491 if (!this.attr_("animatedZooms")) {
1492 this.dateWindow_
= null;
1493 for (i
= 0; i
< this.axes_
.length
; i
++) {
1494 if (this.axes_
[i
].valueWindow
!== null) {
1495 delete this.axes_
[i
].valueWindow
;
1499 if (this.attr_("zoomCallback")) {
1500 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1505 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1507 oldWindow
= this.xAxisRange();
1508 newWindow
= [minDate
, maxDate
];
1512 oldValueRanges
= this.yAxisRanges();
1513 // TODO(danvk): this is pretty inefficient
1514 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1515 var extremes
= packed
[1];
1517 // this has the side-effect of modifying this.axes_.
1518 // this doesn't make much sense in this context, but it's convenient (we
1519 // need this.axes_[*].extremeValues) and not harmful since we'll be
1520 // calling drawGraph_ shortly, which clobbers these values.
1521 this.computeYAxisRanges_(extremes
);
1523 newValueRanges
= [];
1524 for (i
= 0; i
< this.axes_
.length
; i
++) {
1525 var axis
= this.axes_
[i
];
1526 newValueRanges
.push(axis
.valueRange
!== null ?
1527 axis
.valueRange
: axis
.extremeRange
);
1532 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1534 that
.dateWindow_
= null;
1535 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1536 if (that
.axes_
[i
].valueWindow
!== null) {
1537 delete that
.axes_
[i
].valueWindow
;
1540 if (that
.attr_("zoomCallback")) {
1541 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1548 * Combined animation logic for all zoom functions.
1549 * either the x parameters or y parameters may be null.
1552 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1553 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1556 var valueRanges
= [];
1559 if (oldXRange
!== null && newXRange
!== null) {
1560 for (step
= 1; step
<= steps
; step
++) {
1561 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1562 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1563 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1567 if (oldYRanges
!== null && newYRanges
!== null) {
1568 for (step
= 1; step
<= steps
; step
++) {
1569 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1571 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1572 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1573 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1575 valueRanges
[step
-1] = thisRange
;
1580 Dygraph
.repeatAndCleanup(function(step
) {
1581 if (valueRanges
.length
) {
1582 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1583 var w
= valueRanges
[step
][i
];
1584 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1587 if (windows
.length
) {
1588 that
.dateWindow_
= windows
[step
];
1591 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1595 * Get the current graph's area object.
1597 * Returns: {x, y, w, h}
1599 Dygraph
.prototype.getArea
= function() {
1600 return this.plotter_
.area
;
1604 * Convert a mouse event to DOM coordinates relative to the graph origin.
1606 * Returns a two-element array: [X, Y].
1608 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1609 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1610 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1611 return [canvasx
, canvasy
];
1615 * Given a canvas X coordinate, find the closest row.
1616 * @param {Number} domX graph-relative DOM X coordinate
1617 * Returns: row number, integer
1620 Dygraph
.prototype.findClosestRow
= function(domX
) {
1621 var minDistX
= Infinity
;
1622 var pointIdx
= -1, setIdx
= -1;
1623 var sets
= this.layout_
.points
;
1624 for (var i
= 0; i
< sets
.length
; i
++) {
1625 var points
= sets
[i
];
1626 var len
= points
.length
;
1627 for (var j
= 0; j
< len
; j
++) {
1628 var point
= points
[j
];
1629 if (!Dygraph
.isValidPoint(point
, true)) continue;
1630 var dist
= Math
.abs(point
.canvasx
- domX
);
1631 if (dist
< minDistX
) {
1639 // TODO(danvk): remove this function; it's trivial and has only one use.
1640 return this.idxToRow_(setIdx
, pointIdx
);
1644 * Given canvas X,Y coordinates, find the closest point.
1646 * This finds the individual data point across all visible series
1647 * that's closest to the supplied DOM coordinates using the standard
1648 * Euclidean X,Y distance.
1650 * @param {Number} domX graph-relative DOM X coordinate
1651 * @param {Number} domY graph-relative DOM Y coordinate
1652 * Returns: {row, seriesName, point}
1655 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1656 var minDist
= Infinity
;
1658 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1659 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1660 var points
= this.layout_
.points
[setIdx
];
1661 for (var i
= 0; i
< points
.length
; ++i
) {
1662 var point
= points
[i
];
1663 if (!Dygraph
.isValidPoint(point
)) continue;
1664 dx
= point
.canvasx
- domX
;
1665 dy
= point
.canvasy
- domY
;
1666 dist
= dx
* dx
+ dy
* dy
;
1667 if (dist
< minDist
) {
1669 closestPoint
= point
;
1670 closestSeries
= setIdx
;
1675 var name
= this.layout_
.setNames
[closestSeries
];
1677 row
: idx
+ this.getLeftBoundary_(),
1684 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1686 * This first finds the X data point closest to the supplied DOM X coordinate,
1687 * then finds the series which puts the Y coordinate on top of its filled area,
1688 * using linear interpolation between adjacent point pairs.
1690 * @param {Number} domX graph-relative DOM X coordinate
1691 * @param {Number} domY graph-relative DOM Y coordinate
1692 * Returns: {row, seriesName, point}
1695 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1696 var row
= this.findClosestRow(domX
);
1697 var boundary
= this.getLeftBoundary_();
1698 var rowIdx
= row
- boundary
;
1699 var sets
= this.layout_
.points
;
1700 var closestPoint
, closestSeries
;
1701 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1702 var points
= this.layout_
.points
[setIdx
];
1703 if (rowIdx
>= points
.length
) continue;
1704 var p1
= points
[rowIdx
];
1705 if (!Dygraph
.isValidPoint(p1
)) continue;
1706 var py
= p1
.canvasy
;
1707 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1708 // interpolate series Y value using next point
1709 var p2
= points
[rowIdx
+ 1];
1710 if (Dygraph
.isValidPoint(p2
)) {
1711 var dx
= p2
.canvasx
- p1
.canvasx
;
1713 var r
= (domX
- p1
.canvasx
) / dx
;
1714 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1717 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1718 // interpolate series Y value using previous point
1719 var p0
= points
[rowIdx
- 1];
1720 if (Dygraph
.isValidPoint(p0
)) {
1721 var dx
= p1
.canvasx
- p0
.canvasx
;
1723 var r
= (p1
.canvasx
- domX
) / dx
;
1724 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1728 // Stop if the point (domX, py) is above this series' upper edge
1729 if (setIdx
=== 0 || py
< domY
) {
1731 closestSeries
= setIdx
;
1734 var name
= this.layout_
.setNames
[closestSeries
];
1743 * When the mouse moves in the canvas, display information about a nearby data
1744 * point and draw dots over those points in the data series. This function
1745 * takes care of cleanup of previously-drawn dots.
1746 * @param {Object} event The mousemove event from the browser.
1749 Dygraph
.prototype.mouseMove_
= function(event
) {
1750 // This prevents JS errors when mousing over the canvas before data loads.
1751 var points
= this.layout_
.points
;
1752 if (points
=== undefined
|| points
=== null) return;
1754 var canvasCoords
= this.eventToDomCoords(event
);
1755 var canvasx
= canvasCoords
[0];
1756 var canvasy
= canvasCoords
[1];
1758 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1759 var selectionChanged
= false;
1760 if (highlightSeriesOpts
&& !this.lockedSet_
) {
1762 if (this.attr_("stackedGraph")) {
1763 closest
= this.findStackedPoint(canvasx
, canvasy
);
1765 closest
= this.findClosestPoint(canvasx
, canvasy
);
1767 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1769 var idx
= this.findClosestRow(canvasx
);
1770 selectionChanged
= this.setSelection(idx
);
1773 var callback
= this.attr_("highlightCallback");
1774 if (callback
&& selectionChanged
) {
1775 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1780 * Fetch left offset from first defined boundaryIds record (see bug #236).
1783 Dygraph
.prototype.getLeftBoundary_
= function() {
1784 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1785 if (this.boundaryIds_
[i
] !== undefined
) {
1786 return this.boundaryIds_
[i
][0];
1793 * Transforms layout_.points index into data row number.
1794 * @param int layout_.points index
1795 * @return int row number, or -1 if none could be found.
1798 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1799 if (rowIdx
< 0) return -1;
1801 var boundary
= this.getLeftBoundary_();
1802 return boundary
+ rowIdx
;
1803 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1804 // var set = this.layout_.datasets[setIdx];
1805 // if (idx < set.length) {
1806 // return boundary + idx;
1808 // idx -= set.length;
1813 Dygraph
.prototype.animateSelection_
= function(direction
) {
1814 var totalSteps
= 10;
1816 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1817 if (this.animateId
=== undefined
) this.animateId
= 0;
1818 var start
= this.fadeLevel
;
1819 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1821 if (this.fadeLevel
) {
1822 this.updateSelection_(1.0);
1827 var thisId
= ++this.animateId
;
1829 Dygraph
.repeatAndCleanup(
1831 // ignore simultaneous animations
1832 if (that
.animateId
!= thisId
) return;
1834 that
.fadeLevel
+= direction
;
1835 if (that
.fadeLevel
=== 0) {
1836 that
.clearSelection();
1838 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1841 steps
, millis
, function() {});
1845 * Draw dots over the selectied points in the data series. This function
1846 * takes care of cleanup of previously-drawn dots.
1849 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1850 var defaultPrevented
= this.cascadeEvents_('select', {
1851 selectedX
: this.lastx_
,
1852 selectedPoints
: this.selPoints_
1854 // TODO(danvk): use defaultPrevented here?
1856 // Clear the previously drawn vertical, if there is one
1858 var ctx
= this.canvas_ctx_
;
1859 if (this.attr_('highlightSeriesOpts')) {
1860 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1861 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1863 // Activating background fade includes an animation effect for a gradual
1864 // fade. TODO(klausw): make this independently configurable if it causes
1865 // issues? Use a shared preference to control animations?
1866 var animateBackgroundFade
= true;
1867 if (animateBackgroundFade
) {
1868 if (opt_animFraction
=== undefined
) {
1869 // start a new animation
1870 this.animateSelection_(1);
1873 alpha
*= opt_animFraction
;
1875 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1876 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1879 // Redraw only the highlighted series in the interactive canvas (not the
1880 // static plot canvas, which is where series are usually drawn).
1881 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1882 } else if (this.previousVerticalX_
>= 0) {
1883 // Determine the maximum highlight circle size.
1884 var maxCircleSize
= 0;
1885 var labels
= this.attr_('labels');
1886 for (i
= 1; i
< labels
.length
; i
++) {
1887 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1888 if (r
> maxCircleSize
) maxCircleSize
= r
;
1890 var px
= this.previousVerticalX_
;
1891 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1892 2 * maxCircleSize
+ 2, this.height_
);
1895 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1896 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1899 if (this.selPoints_
.length
> 0) {
1900 // Draw colored circles over the center of each selected point
1901 var canvasx
= this.selPoints_
[0].canvasx
;
1903 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1904 var pt
= this.selPoints_
[i
];
1905 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1907 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1908 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1909 var color
= this.plotter_
.colors
[pt
.name
];
1911 callback
= Dygraph
.Circles
.DEFAULT
;
1913 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1914 ctx
.strokeStyle
= color
;
1915 ctx
.fillStyle
= color
;
1916 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1921 this.previousVerticalX_
= canvasx
;
1926 * Manually set the selected points and display information about them in the
1927 * legend. The selection can be cleared using clearSelection() and queried
1928 * using getSelection().
1929 * @param { Integer } row number that should be highlighted (i.e. appear with
1930 * hover dots on the chart). Set to false to clear any selection.
1931 * @param { seriesName } optional series name to highlight that series with the
1932 * the highlightSeriesOpts setting.
1933 * @param { locked } optional If true, keep seriesName selected when mousing
1934 * over the graph, disabling closest-series highlighting. Call clearSelection()
1937 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1938 // Extract the points we've selected
1939 this.selPoints_
= [];
1941 if (row
!== false) {
1942 row
-= this.getLeftBoundary_();
1945 var changed
= false;
1946 if (row
!== false && row
>= 0) {
1947 if (row
!= this.lastRow_
) changed
= true;
1948 this.lastRow_
= row
;
1949 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1950 var set
= this.layout_
.datasets
[setIdx
];
1951 if (row
< set
.length
) {
1952 var point
= this.layout_
.points
[setIdx
][row
];
1954 if (this.attr_("stackedGraph")) {
1955 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1958 if (point
.yval
!== null) this.selPoints_
.push(point
);
1962 if (this.lastRow_
>= 0) changed
= true;
1966 if (this.selPoints_
.length
) {
1967 this.lastx_
= this.selPoints_
[0].xval
;
1972 if (opt_seriesName
!== undefined
) {
1973 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1974 this.highlightSet_
= opt_seriesName
;
1977 if (opt_locked
!== undefined
) {
1978 this.lockedSet_
= opt_locked
;
1982 this.updateSelection_(undefined
);
1988 * The mouse has left the canvas. Clear out whatever artifacts remain
1989 * @param {Object} event the mouseout event from the browser.
1992 Dygraph
.prototype.mouseOut_
= function(event
) {
1993 if (this.attr_("unhighlightCallback")) {
1994 this.attr_("unhighlightCallback")(event
);
1997 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
1998 this.clearSelection();
2003 * Clears the current selection (i.e. points that were highlighted by moving
2004 * the mouse over the chart).
2006 Dygraph
.prototype.clearSelection
= function() {
2007 this.cascadeEvents_('deselect', {});
2009 this.lockedSet_
= false;
2010 // Get rid of the overlay data
2011 if (this.fadeLevel
) {
2012 this.animateSelection_(-1);
2015 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2017 this.selPoints_
= [];
2020 this.highlightSet_
= null;
2024 * Returns the number of the currently selected row. To get data for this row,
2025 * you can use the getValue method.
2026 * @return { Integer } row number, or -1 if nothing is selected
2028 Dygraph
.prototype.getSelection
= function() {
2029 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2033 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2034 var points
= this.layout_
.points
[setIdx
];
2035 for (var row
= 0; row
< points
.length
; row
++) {
2036 if (points
[row
].x
== this.selPoints_
[0].x
) {
2037 return row
+ this.getLeftBoundary_();
2045 * Returns the name of the currently-highlighted series.
2046 * Only available when the highlightSeriesOpts option is in use.
2048 Dygraph
.prototype.getHighlightSeries
= function() {
2049 return this.highlightSet_
;
2053 * Fires when there's data available to be graphed.
2054 * @param {String} data Raw CSV data to be plotted
2057 Dygraph
.prototype.loadedEvent_
= function(data
) {
2058 this.rawData_
= this.parseCSV_(data
);
2063 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2066 Dygraph
.prototype.addXTicks_
= function() {
2067 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2069 if (this.dateWindow_
) {
2070 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2072 range
= this.fullXRange_();
2075 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2076 var xTicks
= xAxisOptionsView('ticker')(
2079 this.width_
, // TODO(danvk): should be area.width
2082 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2083 // console.log(msg);
2084 this.layout_
.setXTicks(xTicks
);
2089 * Computes the range of the data series (including confidence intervals).
2090 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2091 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2092 * @return [low, high]
2094 Dygraph
.prototype.extremeValues_
= function(series
) {
2095 var minY
= null, maxY
= null, j
, y
;
2097 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2099 // With custom bars, maxY is the max of the high values.
2100 for (j
= 0; j
< series
.length
; j
++) {
2101 y
= series
[j
][1][0];
2103 var low
= y
- series
[j
][1][1];
2104 var high
= y
+ series
[j
][1][2];
2105 if (low
> y
) low
= y
; // this can happen with custom bars,
2106 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2107 if (maxY
=== null || high
> maxY
) {
2110 if (minY
=== null || low
< minY
) {
2115 for (j
= 0; j
< series
.length
; j
++) {
2117 if (y
=== null || isNaN(y
)) continue;
2118 if (maxY
=== null || y
> maxY
) {
2121 if (minY
=== null || y
< minY
) {
2127 return [minY
, maxY
];
2132 * This function is called once when the chart's data is changed or the options
2133 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2134 * idea is that values derived from the chart's data can be computed here,
2135 * rather than every time the chart is drawn. This includes things like the
2136 * number of axes, rolling averages, etc.
2138 Dygraph
.prototype.predraw_
= function() {
2139 var start
= new Date();
2141 // TODO(danvk): move more computations out of drawGraph_ and into here.
2142 this.computeYAxes_();
2144 // Create a new plotter.
2145 if (this.plotter_
) {
2146 this.cascadeEvents_('clearChart');
2147 this.plotter_
.clear();
2149 this.plotter_
= new DygraphCanvasRenderer(this,
2154 // The roller sits in the bottom left corner of the chart. We don't know where
2155 // this will be until the options are available, so it's positioned here.
2156 this.createRollInterface_();
2158 this.cascadeEvents_('predraw');
2160 if (this.rangeSelector_
) {
2161 this.rangeSelector_
.renderStaticLayer();
2164 // Convert the raw data (a 2D array) into the internal format and compute
2165 // rolling averages.
2166 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2167 for (var i
= 1; i
< this.numColumns(); i
++) {
2168 var logScale
= this.attr_('logscale', i
); // TODO(klausw): this looks wrong
2169 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2170 series
= this.rollingAverage(series
, this.rollPeriod_
);
2171 this.rolledSeries_
.push(series
);
2174 // If the data or options have changed, then we'd better redraw.
2177 // This is used to determine whether to do various animations.
2178 var end
= new Date();
2179 this.drawingTimeMs_
= (end
- start
);
2183 * Loop over all fields and create datasets, calculating extreme y-values for
2184 * each series and extreme x-indices as we go.
2186 * dateWindow is passed in as an explicit parameter so that we can compute
2187 * extreme values "speculatively", i.e. without actually setting state on the
2190 * TODO(danvk): make this more of a true function
2191 * @return [ datasets, seriesExtremes, boundaryIds ]
2194 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2195 var boundaryIds
= [];
2196 var cumulative_y
= []; // For stacked series.
2198 var extremes
= {}; // series name -> [low, high]
2201 // Loop over the fields (series). Go from the last to the first,
2202 // because if they're stacked that's how we accumulate the values.
2203 var num_series
= rolledSeries
.length
- 1;
2204 for (i
= num_series
; i
>= 1; i
--) {
2205 if (!this.visibility()[i
- 1]) continue;
2207 // Note: this copy _is_ necessary at the moment.
2208 // If you remove it, it breaks zooming with error bars on.
2209 // TODO(danvk): investigate further & write a test for this.
2211 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2212 series
.push(rolledSeries
[i
][j
]);
2215 // Prune down to the desired range, if necessary (for zooming)
2216 // Because there can be lines going to points outside of the visible area,
2217 // we actually prune to visible points, plus one on either side.
2218 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2220 var low
= dateWindow
[0];
2221 var high
= dateWindow
[1];
2223 // TODO(danvk): do binary search instead of linear search.
2224 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2225 var firstIdx
= null, lastIdx
= null;
2226 for (k
= 0; k
< series
.length
; k
++) {
2227 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2230 if (series
[k
][0] <= high
) {
2234 if (firstIdx
=== null) firstIdx
= 0;
2235 if (firstIdx
> 0) firstIdx
--;
2236 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2237 if (lastIdx
< series
.length
- 1) lastIdx
++;
2238 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2239 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2240 pruned
.push(series
[k
]);
2244 boundaryIds
[i
-1] = [0, series
.length
-1];
2247 var seriesExtremes
= this.extremeValues_(series
);
2250 for (j
=0; j
<series
.length
; j
++) {
2251 series
[j
] = [series
[j
][0],
2256 } else if (this.attr_("stackedGraph")) {
2257 var l
= series
.length
;
2259 for (j
= 0; j
< l
; j
++) {
2260 // If one data set has a NaN, let all subsequent stacked
2261 // sets inherit the NaN -- only start at 0 for the first set.
2262 var x
= series
[j
][0];
2263 if (cumulative_y
[x
] === undefined
) {
2264 cumulative_y
[x
] = 0;
2267 actual_y
= series
[j
][1];
2268 if (actual_y
=== null) {
2269 series
[j
] = [x
, null];
2273 cumulative_y
[x
] += actual_y
;
2275 series
[j
] = [x
, cumulative_y
[x
]];
2277 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2278 seriesExtremes
[1] = cumulative_y
[x
];
2280 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2281 seriesExtremes
[0] = cumulative_y
[x
];
2286 var seriesName
= this.attr_("labels")[i
];
2287 extremes
[seriesName
] = seriesExtremes
;
2288 datasets
[i
] = series
;
2291 // For stacked graphs, a NaN value for any point in the sum should create a
2292 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2293 if (this.attr_("stackedGraph")) {
2294 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2295 // Use the first nonempty dataset to get X values.
2296 if (!datasets
[k
]) continue;
2297 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2298 var x
= datasets
[k
][j
][0];
2299 if (isNaN(cumulative_y
[x
])) {
2300 // Set all Y values to NaN at that X value.
2301 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2302 if (!datasets
[i
]) continue;
2303 datasets
[i
][j
][1] = NaN
;
2311 return [ datasets
, extremes
, boundaryIds
];
2315 * Update the graph with new data. This method is called when the viewing area
2316 * has changed. If the underlying data or options have changed, predraw_ will
2317 * be called before drawGraph_ is called.
2321 Dygraph
.prototype.drawGraph_
= function() {
2322 var start
= new Date();
2324 // This is used to set the second parameter to drawCallback, below.
2325 var is_initial_draw
= this.is_initial_draw_
;
2326 this.is_initial_draw_
= false;
2328 this.layout_
.removeAllDatasets();
2330 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2332 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2333 var datasets
= packed
[0];
2334 var extremes
= packed
[1];
2335 this.boundaryIds_
= packed
[2];
2337 this.setIndexByName_
= {};
2338 var labels
= this.attr_("labels");
2339 if (labels
.length
> 0) {
2340 this.setIndexByName_
[labels
[0]] = 0;
2343 for (var i
= 1; i
< datasets
.length
; i
++) {
2344 this.setIndexByName_
[labels
[i
]] = i
;
2345 if (!this.visibility()[i
- 1]) continue;
2346 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2347 this.datasetIndex_
[i
] = dataIdx
++;
2350 this.computeYAxisRanges_(extremes
);
2351 this.layout_
.setYAxes(this.axes_
);
2355 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2356 var tmp_zoomed_x
= this.zoomed_x_
;
2357 // Tell PlotKit to use this new data and render itself
2358 this.layout_
.setDateWindow(this.dateWindow_
);
2359 this.zoomed_x_
= tmp_zoomed_x
;
2360 this.layout_
.evaluateWithError();
2361 this.renderGraph_(is_initial_draw
);
2363 if (this.attr_("timingName")) {
2364 var end
= new Date();
2366 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2372 * This does the work of drawing the chart. It assumes that the layout and axis
2373 * scales have already been set (e.g. by predraw_).
2377 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2378 this.cascadeEvents_('clearChart');
2379 this.plotter_
.clear();
2381 if (this.attr_('underlayCallback')) {
2382 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2383 // users who expect a deprecated form of this callback.
2384 this.attr_('underlayCallback')(
2385 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2389 canvas
: this.hidden_
,
2390 drawingContext
: this.hidden_ctx_
2392 this.cascadeEvents_('willDrawChart', e
);
2393 this.plotter_
.render();
2394 this.cascadeEvents_('didDrawChart', e
);
2396 // TODO(danvk): is this a performance bottleneck when panning?
2397 // The interaction canvas should already be empty in that situation.
2398 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2399 this.canvas_
.height
);
2401 // Generate a static legend before any particular point is selected.
2403 if (this.rangeSelector_
) {
2404 this.rangeSelector_
.renderInteractiveLayer();
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_ and this.seriesToAxisMap_.
2418 * axes_ = [ { options } ]
2419 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2420 * indices are into the axes_ array.
2422 Dygraph
.prototype.computeYAxes_
= function() {
2423 // Preserve valueWindow settings if they exist, and if the user hasn't
2424 // specified a new valueRange.
2425 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2426 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2428 for (index
= 0; index
< this.axes_
.length
; index
++) {
2429 valueWindows
.push(this.axes_
[index
].valueWindow
);
2433 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2434 this.seriesToAxisMap_
= {};
2436 // Get a list of series names.
2437 var labels
= this.attr_("labels");
2439 for (i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2441 // all options which could be applied per-axis:
2449 'axisLabelFontSize',
2454 // Copy global axis options over to the first axis.
2455 for (i
= 0; i
< axisOptions
.length
; i
++) {
2456 var k
= axisOptions
[i
];
2458 if (v
) this.axes_
[0][k
] = v
;
2461 // Go through once and add all the axes.
2462 for (seriesName
in series
) {
2463 if (!series
.hasOwnProperty(seriesName
)) continue;
2464 axis
= this.attr_("axis", seriesName
);
2465 if (axis
=== null) {
2466 this.seriesToAxisMap_
[seriesName
] = 0;
2469 if (typeof(axis
) == 'object') {
2470 // Add a new axis, making a copy of its per-axis options.
2472 Dygraph
.update(opts
, this.axes_
[0]);
2473 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2474 var yAxisId
= this.axes_
.length
;
2475 opts
.yAxisId
= yAxisId
;
2477 Dygraph
.update(opts
, axis
);
2478 this.axes_
.push(opts
);
2479 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2483 // Go through one more time and assign series to an axis defined by another
2484 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2485 for (seriesName
in series
) {
2486 if (!series
.hasOwnProperty(seriesName
)) continue;
2487 axis
= this.attr_("axis", seriesName
);
2488 if (typeof(axis
) == 'string') {
2489 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2490 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2491 "series " + axis
+ ", which does not define its own axis.");
2494 var idx
= this.seriesToAxisMap_
[axis
];
2495 this.seriesToAxisMap_
[seriesName
] = idx
;
2499 if (valueWindows
!== undefined
) {
2500 // Restore valueWindow settings.
2501 for (index
= 0; index
< valueWindows
.length
; index
++) {
2502 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2507 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2509 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2510 v
= opts("valueRange");
2511 if (v
) this.axes_
[axis
].valueRange
= v
;
2512 } else { // To keep old behavior
2513 var axes
= this.user_attrs_
.axes
;
2514 if (axes
&& axes
.y2
) {
2515 v
= axes
.y2
.valueRange
;
2516 if (v
) this.axes_
[axis
].valueRange
= v
;
2524 * Returns the number of y-axes on the chart.
2525 * @return {Number} the number of axes.
2527 Dygraph
.prototype.numAxes
= function() {
2529 for (var series
in this.seriesToAxisMap_
) {
2530 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2531 var idx
= this.seriesToAxisMap_
[series
];
2532 if (idx
> last_axis
) last_axis
= idx
;
2534 return 1 + last_axis
;
2539 * Returns axis properties for the given series.
2540 * @param { String } setName The name of the series for which to get axis
2541 * properties, e.g. 'Y1'.
2542 * @return { Object } The axis properties.
2544 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2545 // TODO(danvk): handle errors.
2546 return this.axes_
[this.seriesToAxisMap_
[series
]];
2551 * Determine the value range and tick marks for each axis.
2552 * @param {Object} extremes A mapping from seriesName -> [low, high]
2553 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2555 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2556 // Build a map from axis number -> [list of series names]
2557 var seriesForAxis
= [], series
;
2558 for (series
in this.seriesToAxisMap_
) {
2559 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2560 var idx
= this.seriesToAxisMap_
[series
];
2561 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2562 seriesForAxis
[idx
].push(series
);
2565 // Compute extreme values, a span and tick marks for each axis.
2566 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2567 var axis
= this.axes_
[i
];
2569 if (!seriesForAxis
[i
]) {
2570 // If no series are defined or visible then use a reasonable default
2571 axis
.extremeRange
= [0, 1];
2573 // Calculate the extremes of extremes.
2574 series
= seriesForAxis
[i
];
2575 var minY
= Infinity
; // extremes[series[0]][0];
2576 var maxY
= -Infinity
; // extremes[series[0]][1];
2577 var extremeMinY
, extremeMaxY
;
2579 for (var j
= 0; j
< series
.length
; j
++) {
2580 // this skips invisible series
2581 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2583 // Only use valid extremes to stop null data series' from corrupting the scale.
2584 extremeMinY
= extremes
[series
[j
]][0];
2585 if (extremeMinY
!== null) {
2586 minY
= Math
.min(extremeMinY
, minY
);
2588 extremeMaxY
= extremes
[series
[j
]][1];
2589 if (extremeMaxY
!== null) {
2590 maxY
= Math
.max(extremeMaxY
, maxY
);
2593 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2595 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2596 if (minY
== Infinity
) minY
= 0;
2597 if (maxY
== -Infinity
) maxY
= 1;
2599 // Add some padding and round up to an integer to be human-friendly.
2600 var span
= maxY
- minY
;
2601 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2602 if (span
=== 0) { span
= maxY
; }
2604 var maxAxisY
, minAxisY
;
2605 if (axis
.logscale
) {
2606 maxAxisY
= maxY
+ 0.1 * span
;
2609 maxAxisY
= maxY
+ 0.1 * span
;
2610 minAxisY
= minY
- 0.1 * span
;
2612 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2613 if (!this.attr_("avoidMinZero")) {
2614 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2615 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2618 if (this.attr_("includeZero")) {
2619 if (maxY
< 0) maxAxisY
= 0;
2620 if (minY
> 0) minAxisY
= 0;
2623 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2625 if (axis
.valueWindow
) {
2626 // This is only set if the user has zoomed on the y-axis. It is never set
2627 // by a user. It takes precedence over axis.valueRange because, if you set
2628 // valueRange, you'd still expect to be able to pan.
2629 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2630 } else if (axis
.valueRange
) {
2631 // This is a user-set value range for this axis.
2632 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2634 axis
.computedValueRange
= axis
.extremeRange
;
2637 // Add ticks. By default, all axes inherit the tick positions of the
2638 // primary axis. However, if an axis is specifically marked as having
2639 // independent ticks, then that is permissible as well.
2640 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2641 var ticker
= opts('ticker');
2642 if (i
=== 0 || axis
.independentTicks
) {
2643 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2644 axis
.computedValueRange
[1],
2645 this.height_
, // TODO(danvk): should be area.height
2649 var p_axis
= this.axes_
[0];
2650 var p_ticks
= p_axis
.ticks
;
2651 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2652 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2653 var tick_values
= [];
2654 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2655 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2656 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2657 tick_values
.push(y_val
);
2660 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2661 axis
.computedValueRange
[1],
2662 this.height_
, // TODO(danvk): should be area.height
2671 * Extracts one series from the raw data (a 2D array) into an array of (date,
2674 * This is where undesirable points (i.e. negative values on log scales and
2675 * missing values through which we wish to connect lines) are dropped.
2676 * TODO(danvk): the "missing values" bit above doesn't seem right.
2680 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2681 // TODO(danvk): pre-allocate series here.
2683 for (var j
= 0; j
< rawData
.length
; j
++) {
2684 var x
= rawData
[j
][0];
2685 var point
= rawData
[j
][i
];
2687 // On the log scale, points less than zero do not exist.
2688 // This will create a gap in the chart.
2693 series
.push([x
, point
]);
2700 * Calculates the rolling average of a data set.
2701 * If originalData is [label, val], rolls the average of those.
2702 * If originalData is [label, [, it's interpreted as [value, stddev]
2703 * and the roll is returned in the same form, with appropriately reduced
2704 * stddev for each value.
2705 * Note that this is where fractional input (i.e. '5/10') is converted into
2707 * @param {Array} originalData The data in the appropriate format (see above)
2708 * @param {Number} rollPeriod The number of points over which to average the
2711 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2712 if (originalData
.length
< 2)
2713 return originalData
;
2714 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2715 var rollingData
= [];
2716 var sigma
= this.attr_("sigma");
2718 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2719 if (this.fractions_
) {
2721 var den
= 0; // numerator/denominator
2723 for (i
= 0; i
< originalData
.length
; i
++) {
2724 num
+= originalData
[i
][1][0];
2725 den
+= originalData
[i
][1][1];
2726 if (i
- rollPeriod
>= 0) {
2727 num
-= originalData
[i
- rollPeriod
][1][0];
2728 den
-= originalData
[i
- rollPeriod
][1][1];
2731 var date
= originalData
[i
][0];
2732 var value
= den
? num
/ den
: 0.0;
2733 if (this.attr_("errorBars")) {
2734 if (this.attr_("wilsonInterval")) {
2735 // For more details on this confidence interval, see:
2736 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2738 var p
= value
< 0 ? 0 : value
, n
= den
;
2739 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2740 var denom
= 1 + sigma
* sigma
/ den
;
2741 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2742 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2743 rollingData
[i
] = [date
,
2744 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2746 rollingData
[i
] = [date
, [0, 0, 0]];
2749 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2750 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2753 rollingData
[i
] = [date
, mult
* value
];
2756 } else if (this.attr_("customBars")) {
2761 for (i
= 0; i
< originalData
.length
; i
++) {
2762 var data
= originalData
[i
][1];
2764 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2766 if (y
!== null && !isNaN(y
)) {
2772 if (i
- rollPeriod
>= 0) {
2773 var prev
= originalData
[i
- rollPeriod
];
2774 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2782 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2783 1.0 * (mid
- low
) / count
,
2784 1.0 * (high
- mid
) / count
]];
2786 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2790 // Calculate the rolling average for the first rollPeriod - 1 points where
2791 // there is not enough data to roll over the full number of points
2792 if (!this.attr_("errorBars")){
2793 if (rollPeriod
== 1) {
2794 return originalData
;
2797 for (i
= 0; i
< originalData
.length
; i
++) {
2800 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2801 y
= originalData
[j
][1];
2802 if (y
=== null || isNaN(y
)) continue;
2804 sum
+= originalData
[j
][1];
2807 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2809 rollingData
[i
] = [originalData
[i
][0], null];
2814 for (i
= 0; i
< originalData
.length
; i
++) {
2818 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2819 y
= originalData
[j
][1][0];
2820 if (y
=== null || isNaN(y
)) continue;
2822 sum
+= originalData
[j
][1][0];
2823 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2826 stddev
= Math
.sqrt(variance
) / num_ok
;
2827 rollingData
[i
] = [originalData
[i
][0],
2828 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2830 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2840 * Detects the type of the str (date or numeric) and sets the various
2841 * formatting attributes in this.attrs_ based on this type.
2842 * @param {String} str An x value.
2845 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2847 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2848 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2849 str
.indexOf('/') >= 0 ||
2850 isNaN(parseFloat(str
))) {
2852 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2853 // TODO(danvk): remove support for this format.
2858 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2859 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2860 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2861 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2863 /** @private (shut up, jsdoc!) */
2864 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2865 // TODO(danvk): use Dygraph.numberValueFormatter here?
2866 /** @private (shut up, jsdoc!) */
2867 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2868 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2869 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2874 * Parses the value as a floating point number. This is like the parseFloat()
2875 * built-in, but with a few differences:
2876 * - the empty string is parsed as null, rather than NaN.
2877 * - if the string cannot be parsed at all, an error is logged.
2878 * If the string can't be parsed, this method returns null.
2879 * @param {String} x The string to be parsed
2880 * @param {Number} opt_line_no The line number from which the string comes.
2881 * @param {String} opt_line The text of the line from which the string comes.
2885 // Parse the x as a float or return null if it's not a number.
2886 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2887 var val
= parseFloat(x
);
2888 if (!isNaN(val
)) return val
;
2890 // Try to figure out what happeend.
2891 // If the value is the empty string, parse it as null.
2892 if (/^ *$/.test(x
)) return null;
2894 // If it was actually "NaN", return it as NaN.
2895 if (/^ *nan *$/i.test(x
)) return NaN
;
2897 // Looks like a parsing error.
2898 var msg
= "Unable to parse '" + x
+ "' as a number";
2899 if (opt_line
!== null && opt_line_no
!== null) {
2900 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2909 * Parses a string in a special csv format. We expect a csv file where each
2910 * line is a date point, and the first field in each line is the date string.
2911 * We also expect that all remaining fields represent series.
2912 * if the errorBars attribute is set, then interpret the fields as:
2913 * date, series1, stddev1, series2, stddev2, ...
2914 * @param {[Object]} data See above.
2916 * @return [Object] An array with one entry for each row. These entries
2917 * are an array of cells in that row. The first entry is the parsed x-value for
2918 * the row. The second, third, etc. are the y-values. These can take on one of
2919 * three forms, depending on the CSV and constructor parameters:
2921 * 2. [ value, stddev ]
2922 * 3. [ low value, center value, high value ]
2924 Dygraph
.prototype.parseCSV_
= function(data
) {
2926 var lines
= data
.split("\n");
2929 // Use the default delimiter or fall back to a tab if that makes sense.
2930 var delim
= this.attr_('delimiter');
2931 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2936 if (!('labels' in this.user_attrs_
)) {
2937 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2939 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2944 var defaultParserSet
= false; // attempt to auto-detect x value type
2945 var expectedCols
= this.attr_("labels").length
;
2946 var outOfOrder
= false;
2947 for (var i
= start
; i
< lines
.length
; i
++) {
2948 var line
= lines
[i
];
2950 if (line
.length
=== 0) continue; // skip blank lines
2951 if (line
[0] == '#') continue; // skip comment lines
2952 var inFields
= line
.split(delim
);
2953 if (inFields
.length
< 2) continue;
2956 if (!defaultParserSet
) {
2957 this.detectTypeFromString_(inFields
[0]);
2958 xParser
= this.attr_("xValueParser");
2959 defaultParserSet
= true;
2961 fields
[0] = xParser(inFields
[0], this);
2963 // If fractions are expected, parse the numbers as "A/B
"
2964 if (this.fractions_) {
2965 for (j = 1; j < inFields.length; j++) {
2966 // TODO(danvk): figure out an appropriate way to flag parse errors.
2967 vals = inFields[j].split("/");
2968 if (vals.length != 2) {
2969 this.error('Expected fractional "num
/den
" values in CSV data ' +
2970 "but found a value
'" + inFields[j] + "' on line
" +
2971 (1 + i) + " ('" + line + "') which is not of
this form
.");
2974 fields[j] = [this.parseFloat_(vals[0], i, line),
2975 this.parseFloat_(vals[1], i, line)];
2978 } else if (this.attr_("errorBars
")) {
2979 // If there are error bars, values are (value, stddev) pairs
2980 if (inFields.length % 2 != 1) {
2981 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2982 'but line ' + (1 + i) + ' has an odd number of values (' +
2983 (inFields.length - 1) + "): '" + line + "'");
2985 for (j = 1; j < inFields.length; j += 2) {
2986 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2987 this.parseFloat_(inFields[j + 1], i, line)];
2989 } else if (this.attr_("customBars
")) {
2990 // Bars are a low;center;high tuple
2991 for (j = 1; j < inFields.length; j++) {
2992 var val = inFields[j];
2993 if (/^ *$/.test(val)) {
2994 fields[j] = [null, null, null];
2996 vals = val.split(";");
2997 if (vals.length == 3) {
2998 fields[j] = [ this.parseFloat_(vals[0], i, line),
2999 this.parseFloat_(vals[1], i, line),
3000 this.parseFloat_(vals[2], i, line) ];
3002 this.warn('When using customBars, values must be either blank ' +
3003 'or "low
;center
;high
" tuples (got "' + val +
3004 '" on line ' + (1+i));
3009 // Values are just numbers
3010 for (j = 1; j < inFields.length; j++) {
3011 fields[j] = this.parseFloat_(inFields[j], i, line);
3014 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
3018 if (fields.length != expectedCols) {
3019 this.error("Number of columns
in line
" + i + " (" + fields.length +
3020 ") does not agree
with number of
labels (" + expectedCols +
3024 // If the user specified the 'labels' option and none of the cells of the
3025 // first row parsed correctly, then they probably double-specified the
3026 // labels. We go with the values set in the option, discard this row and
3027 // log a warning to the JS console.
3028 if (i === 0 && this.attr_('labels')) {
3029 var all_null = true;
3030 for (j = 0; all_null && j < fields.length; j++) {
3031 if (fields[j]) all_null = false;
3034 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3035 "CSV
data ('" + line + "') appears to also contain labels
. " +
3036 "Will drop the CSV labels and
use the option labels
.");
3044 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3045 ret.sort(function(a,b) { return a[0] - b[0]; });
3053 * The user has provided their data as a pre-packaged JS array. If the x values
3054 * are numeric, this is the same as dygraphs' internal format. If the x values
3055 * are dates, we need to convert them from Date objects to ms since epoch.
3056 * @param {[Object]} data
3057 * @return {[Object]} data with numeric x values.
3059 Dygraph.prototype.parseArray_ = function(data) {
3060 // Peek at the first x value to see if it's numeric.
3061 if (data.length === 0) {
3062 this.error("Can
't plot empty data set");
3065 if (data[0].length === 0) {
3066 this.error("Data set cannot contain an empty row");
3071 if (this.attr_("labels") === null) {
3072 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3073 "in the options parameter");
3074 this.attrs_.labels = [ "X" ];
3075 for (i = 1; i < data[0].length; i++) {
3076 this.attrs_.labels.push("Y" + i);
3079 var num_labels = this.attr_("labels");
3080 if (num_labels.length != data[0].length) {
3081 this.error("Mismatch between number of labels (" + num_labels +
3082 ") and number of columns in array (" + data[0].length + ")");
3087 if (Dygraph.isDateLike(data[0][0])) {
3088 // Some intelligent defaults for a date x-axis.
3089 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3090 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3091 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3093 // Assume they're all dates
.
3094 var parsedData
= Dygraph
.clone(data
);
3095 for (i
= 0; i
< data
.length
; i
++) {
3096 if (parsedData
[i
].length
=== 0) {
3097 this.error("Row " + (1 + i
) + " of data is empty");
3100 if (parsedData
[i
][0] === null ||
3101 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3102 isNaN(parsedData
[i
][0].getTime())) {
3103 this.error("x value in row " + (1 + i
) + " is not a Date");
3106 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3110 // Some intelligent defaults for a numeric x-axis.
3111 /** @private (shut up, jsdoc!) */
3112 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3113 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3114 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3120 * Parses a DataTable object from gviz.
3121 * The data is expected to have a first column that is either a date or a
3122 * number. All subsequent columns must be numbers. If there is a clear mismatch
3123 * between this.xValueParser_ and the type of the first column, it will be
3124 * fixed. Fills out rawData_.
3125 * @param {[Object]} data See above.
3128 Dygraph
.prototype.parseDataTable_
= function(data
) {
3129 var shortTextForAnnotationNum
= function(num
) {
3130 // converts [0-9]+ [A-Z][a-z]*
3131 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3132 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3133 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3134 num
= Math
.floor(num
/ 26);
3136 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3137 num
= Math
.floor((num
- 1) / 26);
3142 var cols
= data
.getNumberOfColumns();
3143 var rows
= data
.getNumberOfRows();
3145 var indepType
= data
.getColumnType(0);
3146 if (indepType
== 'date' || indepType
== 'datetime') {
3147 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3148 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3149 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3150 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3151 } else if (indepType
== 'number') {
3152 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3153 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3154 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3155 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3157 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3158 "column 1 of DataTable input (Got '" + indepType
+ "')");
3162 // Array of the column indices which contain data (and not annotations).
3164 var annotationCols
= {}; // data index -> [annotation cols]
3165 var hasAnnotations
= false;
3167 for (i
= 1; i
< cols
; i
++) {
3168 var type
= data
.getColumnType(i
);
3169 if (type
== 'number') {
3171 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3172 // This is OK -- it's an annotation column.
3173 var dataIdx
= colIdx
[colIdx
.length
- 1];
3174 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3175 annotationCols
[dataIdx
] = [i
];
3177 annotationCols
[dataIdx
].push(i
);
3179 hasAnnotations
= true;
3181 this.error("Only 'number' is supported as a dependent type with Gviz." +
3182 " 'string' is only supported if displayAnnotations is true");
3186 // Read column labels
3187 // TODO(danvk): add support back for errorBars
3188 var labels
= [data
.getColumnLabel(0)];
3189 for (i
= 0; i
< colIdx
.length
; i
++) {
3190 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3191 if (this.attr_("errorBars")) i
+= 1;
3193 this.attrs_
.labels
= labels
;
3194 cols
= labels
.length
;
3197 var outOfOrder
= false;
3198 var annotations
= [];
3199 for (i
= 0; i
< rows
; i
++) {
3201 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3202 data
.getValue(i
, 0) === null) {
3203 this.warn("Ignoring row " + i
+
3204 " of DataTable because of undefined or null first column.");
3208 if (indepType
== 'date' || indepType
== 'datetime') {
3209 row
.push(data
.getValue(i
, 0).getTime());
3211 row
.push(data
.getValue(i
, 0));
3213 if (!this.attr_("errorBars")) {
3214 for (j
= 0; j
< colIdx
.length
; j
++) {
3215 var col
= colIdx
[j
];
3216 row
.push(data
.getValue(i
, col
));
3217 if (hasAnnotations
&&
3218 annotationCols
.hasOwnProperty(col
) &&
3219 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3221 ann
.series
= data
.getColumnLabel(col
);
3223 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3225 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3226 if (k
) ann
.text
+= "\n";
3227 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3229 annotations
.push(ann
);
3233 // Strip out infinities, which give dygraphs problems later on.
3234 for (j
= 0; j
< row
.length
; j
++) {
3235 if (!isFinite(row
[j
])) row
[j
] = null;
3238 for (j
= 0; j
< cols
- 1; j
++) {
3239 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3242 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3249 this.warn("DataTable is out of order; order it correctly to speed loading.");
3250 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3252 this.rawData_
= ret
;
3254 if (annotations
.length
> 0) {
3255 this.setAnnotations(annotations
, true);
3260 * Get the CSV data. If it's in a function, call that function. If it's in a
3261 * file, do an XMLHttpRequest to get it.
3264 Dygraph
.prototype.start_
= function() {
3265 var data
= this.file_
;
3267 // Functions can return references of all other types.
3268 if (typeof data
== 'function') {
3272 if (Dygraph
.isArrayLike(data
)) {
3273 this.rawData_
= this.parseArray_(data
);
3275 } else if (typeof data
== 'object' &&
3276 typeof data
.getColumnRange
== 'function') {
3277 // must be a DataTable from gviz.
3278 this.parseDataTable_(data
);
3280 } else if (typeof data
== 'string') {
3281 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3282 if (data
.indexOf('\n') >= 0) {
3283 this.loadedEvent_(data
);
3285 var req
= new XMLHttpRequest();
3287 req
.onreadystatechange
= function () {
3288 if (req
.readyState
== 4) {
3289 if (req
.status
=== 200 || // Normal http
3290 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3291 caller
.loadedEvent_(req
.responseText
);
3296 req
.open("GET", data
, true);
3300 this.error("Unknown data format: " + (typeof data
));
3305 * Changes various properties of the graph. These can include:
3307 * <li>file: changes the source data for the graph</li>
3308 * <li>errorBars: changes whether the data contains stddev</li>
3311 * There's a huge variety of options that can be passed to this method. For a
3312 * full list, see http://dygraphs.com/options.html.
3314 * @param {Object} attrs The new properties and values
3315 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3316 * call to updateOptions(). If you know better, you can pass true to explicitly
3317 * block the redraw. This can be useful for chaining updateOptions() calls,
3318 * avoiding the occasional infinite loop and preventing redraws when it's not
3319 * necessary (e.g. when updating a callback).
3321 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3322 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3324 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3325 var file
= input_attrs
.file
;
3326 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3328 // TODO(danvk): this is a mess. Move these options into attr_.
3329 if ('rollPeriod' in attrs
) {
3330 this.rollPeriod_
= attrs
.rollPeriod
;
3332 if ('dateWindow' in attrs
) {
3333 this.dateWindow_
= attrs
.dateWindow
;
3334 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3335 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3338 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3339 this.zoomed_y_
= (attrs
.valueRange
!== null);
3342 // TODO(danvk): validate per-series options.
3347 // highlightCircleSize
3349 // Check if this set options will require new points.
3350 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3352 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3356 if (!block_redraw
) this.start_();
3358 if (!block_redraw
) {
3359 if (requiresNewPoints
) {
3362 this.renderGraph_(false);
3369 * Returns a copy of the options with deprecated names converted into current
3370 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3371 * interested in that, they should save a copy before calling this.
3374 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3376 for (var k
in attrs
) {
3377 if (k
== 'file') continue;
3378 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3381 var set
= function(axis
, opt
, value
) {
3382 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3383 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3384 my_attrs
.axes
[axis
][opt
] = value
;
3386 var map
= function(opt
, axis
, new_opt
) {
3387 if (typeof(attrs
[opt
]) != 'undefined') {
3388 set(axis
, new_opt
, attrs
[opt
]);
3389 delete my_attrs
[opt
];
3393 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3394 map('xValueFormatter', 'x', 'valueFormatter');
3395 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3396 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3397 map('xTicker', 'x', 'ticker');
3398 map('yValueFormatter', 'y', 'valueFormatter');
3399 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3400 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3401 map('yTicker', 'y', 'ticker');
3406 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3407 * containing div (which has presumably changed size since the dygraph was
3408 * instantiated. If the width/height are specified, the div will be resized.
3410 * This is far more efficient than destroying and re-instantiating a
3411 * Dygraph, since it doesn't have to reparse the underlying data.
3413 * @param {Number} [width] Width (in pixels)
3414 * @param {Number} [height] Height (in pixels)
3416 Dygraph
.prototype.resize
= function(width
, height
) {
3417 if (this.resize_lock
) {
3420 this.resize_lock
= true;
3422 if ((width
=== null) != (height
=== null)) {
3423 this.warn("Dygraph.resize() should be called with zero parameters or " +
3424 "two non-NULL parameters. Pretending it was zero.");
3425 width
= height
= null;
3428 var old_width
= this.width_
;
3429 var old_height
= this.height_
;
3432 this.maindiv_
.style
.width
= width
+ "px";
3433 this.maindiv_
.style
.height
= height
+ "px";
3434 this.width_
= width
;
3435 this.height_
= height
;
3437 this.width_
= this.maindiv_
.clientWidth
;
3438 this.height_
= this.maindiv_
.clientHeight
;
3441 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3442 // TODO(danvk): there should be a clear() method.
3443 this.maindiv_
.innerHTML
= "";
3444 this.roller_
= null;
3445 this.attrs_
.labelsDiv
= null;
3446 this.createInterface_();
3447 if (this.annotations_
.length
) {
3448 // createInterface_ reset the layout, so we need to do this.
3449 this.layout_
.setAnnotations(this.annotations_
);
3454 this.resize_lock
= false;
3458 * Adjusts the number of points in the rolling average. Updates the graph to
3459 * reflect the new averaging period.
3460 * @param {Number} length Number of points over which to average the data.
3462 Dygraph
.prototype.adjustRoll
= function(length
) {
3463 this.rollPeriod_
= length
;
3468 * Returns a boolean array of visibility statuses.
3470 Dygraph
.prototype.visibility
= function() {
3471 // Do lazy-initialization, so that this happens after we know the number of
3473 if (!this.attr_("visibility")) {
3474 this.attrs_
.visibility
= [];
3476 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3477 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3478 this.attrs_
.visibility
.push(true);
3480 return this.attr_("visibility");
3484 * Changes the visiblity of a series.
3486 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3487 var x
= this.visibility();
3488 if (num
< 0 || num
>= x
.length
) {
3489 this.warn("invalid series number in setVisibility: " + num
);
3497 * How large of an area will the dygraph render itself in?
3498 * This is used for testing.
3499 * @return A {width: w, height: h} object.
3502 Dygraph
.prototype.size
= function() {
3503 return { width
: this.width_
, height
: this.height_
};
3507 * Update the list of annotations and redraw the chart.
3508 * See dygraphs.com/annotations.html for more info on how to use annotations.
3509 * @param ann {Array} An array of annotation objects.
3510 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3512 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3513 // Only add the annotation CSS rule once we know it will be used.
3514 Dygraph
.addAnnotationRule();
3515 this.annotations_
= ann
;
3516 this.layout_
.setAnnotations(this.annotations_
);
3517 if (!suppressDraw
) {
3523 * Return the list of annotations.
3525 Dygraph
.prototype.annotations
= function() {
3526 return this.annotations_
;
3530 * Get the list of label names for this graph. The first column is the
3531 * x-axis, so the data series names start at index 1.
3533 Dygraph
.prototype.getLabels
= function() {
3534 return this.attr_("labels").slice();
3538 * Get the index of a series (column) given its name. The first column is the
3539 * x-axis, so the data series start with index 1.
3541 Dygraph
.prototype.indexFromSetName
= function(name
) {
3542 return this.setIndexByName_
[name
];
3546 * Get the internal dataset index given its name. These are numbered starting from 0,
3547 * and only count visible sets.
3550 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3551 return this.datasetIndex_
[this.indexFromSetName(name
)];
3556 * Adds a default style for the annotation CSS classes to the document. This is
3557 * only executed when annotations are actually used. It is designed to only be
3558 * called once -- all calls after the first will return immediately.
3560 Dygraph
.addAnnotationRule
= function() {
3561 // TODO(danvk): move this function into plugins/annotations.js
?
3562 if (Dygraph
.addedAnnotationCSS
) return;
3564 var rule
= "border: 1px solid black; " +
3565 "background-color: white; " +
3566 "text-align: center;";
3568 var styleSheetElement
= document
.createElement("style");
3569 styleSheetElement
.type
= "text/css";
3570 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3572 // Find the first style sheet that we can access.
3573 // We may not add a rule to a style sheet from another domain for security
3574 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3575 // adds its own style sheets from google.com.
3576 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3577 if (document
.styleSheets
[i
].disabled
) continue;
3578 var mysheet
= document
.styleSheets
[i
];
3580 if (mysheet
.insertRule
) { // Firefox
3581 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3582 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3583 } else if (mysheet
.addRule
) { // IE
3584 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3586 Dygraph
.addedAnnotationCSS
= true;
3589 // Was likely a security exception.
3593 this.warn("Unable to add default annotation CSS rule; display may be off.");
3596 // Older pages may still use this name.
3597 var DateGraph
= Dygraph
;