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 // These two options have a bad interaction. See issue 359.
412 if (attrs
.showRangeSelector
&& attrs
.animatedZooms
) {
413 this.warn('You should not set animatedZooms=true when using the range selector.');
414 attrs
.animatedZooms
= false;
417 // Dygraphs has many options, some of which interact with one another.
418 // To keep track of everything, we maintain two sets of options:
420 // this.user_attrs_ only options explicitly set by the user.
421 // this.attrs_ defaults, options derived from user_attrs_, data.
423 // Options are then accessed this.attr_('attr'), which first looks at
424 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
425 // defaults without overriding behavior that the user specifically asks for.
426 this.user_attrs_
= {};
427 Dygraph
.update(this.user_attrs_
, attrs
);
429 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
431 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
433 this.boundaryIds_
= [];
434 this.setIndexByName_
= {};
435 this.datasetIndex_
= [];
437 this.registeredEvents_
= [];
438 this.eventListeners_
= {};
440 this.attributes_
= new DygraphOptions(this);
442 // Create the containing DIV and other interactive elements
443 this.createInterface_();
447 for (var i
= 0; i
< Dygraph
.PLUGINS
.length
; i
++) {
448 var Plugin
= Dygraph
.PLUGINS
[i
];
449 var pluginInstance
= new Plugin();
451 plugin
: pluginInstance
,
457 var handlers
= pluginInstance
.activate(this);
458 for (var eventName
in handlers
) {
459 // TODO(danvk): validate eventName.
460 pluginDict
.events
[eventName
] = handlers
[eventName
];
463 this.plugins_
.push(pluginDict
);
466 // At this point, plugins can no longer register event handlers.
467 // Construct a map from event -> ordered list of [callback, plugin].
468 for (var i
= 0; i
< this.plugins_
.length
; i
++) {
469 var plugin_dict
= this.plugins_
[i
];
470 for (var eventName
in plugin_dict
.events
) {
471 if (!plugin_dict
.events
.hasOwnProperty(eventName
)) continue;
472 var callback
= plugin_dict
.events
[eventName
];
474 var pair
= [plugin_dict
.plugin
, callback
];
475 if (!(eventName
in this.eventListeners_
)) {
476 this.eventListeners_
[eventName
] = [pair
];
478 this.eventListeners_
[eventName
].push(pair
);
487 * Triggers a cascade of events to the various plugins which are interested in them.
488 * Returns true if the "default behavior" should be performed, i.e. if none of
489 * the event listeners called event.preventDefault().
492 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
493 if (!(name
in this.eventListeners_
)) return true;
495 // QUESTION: can we use objects & prototypes to speed this up?
499 defaultPrevented
: false,
500 preventDefault
: function() {
501 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
502 e
.defaultPrevented
= true;
504 propagationStopped
: false,
505 stopPropagation
: function() {
506 e
.propagationStopped
= true;
509 Dygraph
.update(e
, extra_props
);
511 var callback_plugin_pairs
= this.eventListeners_
[name
];
512 if (callback_plugin_pairs
) {
513 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
514 var plugin
= callback_plugin_pairs
[i
][0];
515 var callback
= callback_plugin_pairs
[i
][1];
516 callback
.call(plugin
, e
);
517 if (e
.propagationStopped
) break;
520 return e
.defaultPrevented
;
524 * Returns the zoomed status of the chart for one or both axes.
526 * Axis is an optional parameter. Can be set to 'x' or 'y'.
528 * The zoomed status for an axis is set whenever a user zooms using the mouse
529 * or when the dateWindow or valueRange are updated (unless the
530 * isZoomedIgnoreProgrammaticZoom option is also specified).
532 Dygraph
.prototype.isZoomed
= function(axis
) {
533 if (axis
=== null || axis
=== undefined
) {
534 return this.zoomed_x_
|| this.zoomed_y_
;
536 if (axis
=== 'x') return this.zoomed_x_
;
537 if (axis
=== 'y') return this.zoomed_y_
;
538 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
542 * Returns information about the Dygraph object, including its containing ID.
544 Dygraph
.prototype.toString
= function() {
545 var maindiv
= this.maindiv_
;
546 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
547 return "[Dygraph " + id
+ "]";
552 * Returns the value of an option. This may be set by the user (either in the
553 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
555 * @param { String } name The name of the option, e.g. 'rollPeriod'.
556 * @param { String } [seriesName] The name of the series to which the option
557 * will be applied. If no per-series value of this option is available, then
558 * the global value is returned. This is optional.
559 * @return { ... } The value of the option.
561 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
562 // <REMOVE_FOR_COMBINED>
563 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
564 this.error('Must include options reference JS for testing');
565 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
566 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
567 'in the Dygraphs.OPTIONS_REFERENCE listing.');
568 // Only log this error once.
569 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
571 // </REMOVE_FOR_COMBINED
>
573 // Building an array which we peruse in backwards order to find the correct value.
574 // Options are checked in this order:
575 // series, axis, user attrs, global attrs.
576 // TODO(konigsberg): Can this be made faster by starting with the series and working outward,
577 // rather than building an array?
580 sources
.push(this.attrs_
);
581 if (this.user_attrs_
) {
582 sources
.push(this.user_attrs_
);
584 if (this.user_attrs_
.hasOwnProperty(seriesName
)) {
585 sources
.push(this.user_attrs_
[seriesName
]);
588 // TODO(konigsberg): This special case ought to be documented.
589 if (seriesName
=== this.highlightSet_
&&
590 this.user_attrs_
.hasOwnProperty('highlightSeriesOpts')) {
591 sources
.push(this.user_attrs_
.highlightSeriesOpts
);
597 for (var i
= sources
.length
- 1; i
>= 0; --i
) {
598 var source
= sources
[i
];
599 if (source
.hasOwnProperty(name
)) {
605 var computedValue
= seriesName
? this.attributes_
.findForSeries(name
, seriesName
) : this.attributes_
.find(name
);
607 if (ret
!== computedValue
) {
608 console
.log("Mismatch", name
, seriesName
, ret
, computedValue
);
610 console
.log("Match", name
, seriesName
, ret
, computedValue
);
612 return computedValue
;
616 * Returns the current value for an option, as set in the constructor or via
617 * updateOptions. You may pass in an (optional) series name to get per-series
618 * values for the option.
620 * All values returned by this method should be considered immutable. If you
621 * modify them, there is no guarantee that the changes will be honored or that
622 * dygraphs will remain in a consistent state. If you want to modify an option,
623 * use updateOptions() instead.
625 * @param { String } name The name of the option (e.g. 'strokeWidth')
626 * @param { String } [opt_seriesName] Series name to get per-series values.
627 * @return { ... } The value of the option.
629 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
630 return this.attr_(name
, opt_seriesName
);
635 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
636 * @return { ... } A function mapping string -> option value
638 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
640 return function(opt
) {
641 var axis_opts
= self
.user_attrs_
.axes
;
642 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
643 return axis_opts
[axis
][opt
];
645 // user-specified attributes always trump defaults, even if they're less
647 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
648 return self
.user_attrs_
[opt
];
651 axis_opts
= self
.attrs_
.axes
;
652 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
653 return axis_opts
[axis
][opt
];
655 // check old-style axis options
656 // TODO(danvk): add a deprecation warning if either of these match.
657 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
658 return self
.axes_
[0][opt
];
659 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
660 return self
.axes_
[1][opt
];
662 return self
.attr_(opt
);
667 * Returns the current rolling period, as set by the user or an option.
668 * @return {Number} The number of points in the rolling window
670 Dygraph
.prototype.rollPeriod
= function() {
671 return this.rollPeriod_
;
675 * Returns the currently-visible x-range. This can be affected by zooming,
676 * panning or a call to updateOptions.
677 * Returns a two-element array: [left, right].
678 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
680 Dygraph
.prototype.xAxisRange
= function() {
681 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
685 * Returns the lower- and upper-bound x-axis values of the
688 Dygraph
.prototype.xAxisExtremes
= function() {
689 var left
= this.rawData_
[0][0];
690 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
691 return [left
, right
];
695 * Returns the currently-visible y-range for an axis. This can be affected by
696 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
697 * called with no arguments, returns the range of the first axis.
698 * Returns a two-element array: [bottom, top].
700 Dygraph
.prototype.yAxisRange
= function(idx
) {
701 if (typeof(idx
) == "undefined") idx
= 0;
702 if (idx
< 0 || idx
>= this.axes_
.length
) {
705 var axis
= this.axes_
[idx
];
706 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
710 * Returns the currently-visible y-ranges for each axis. This can be affected by
711 * zooming, panning, calls to updateOptions, etc.
712 * Returns an array of [bottom, top] pairs, one for each y-axis.
714 Dygraph
.prototype.yAxisRanges
= function() {
716 for (var i
= 0; i
< this.axes_
.length
; i
++) {
717 ret
.push(this.yAxisRange(i
));
722 // TODO(danvk): use these functions throughout dygraphs.
724 * Convert from data coordinates to canvas/div X/Y coordinates.
725 * If specified, do this conversion for the coordinate system of a particular
726 * axis. Uses the first axis by default.
727 * Returns a two-element array: [X, Y]
729 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
730 * instead of toDomCoords(null, y, axis).
732 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
733 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
737 * Convert from data x coordinates to canvas/div X coordinate.
738 * If specified, do this conversion for the coordinate system of a particular
740 * Returns a single value or null if x is null.
742 Dygraph
.prototype.toDomXCoord
= function(x
) {
747 var area
= this.plotter_
.area
;
748 var xRange
= this.xAxisRange();
749 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
753 * Convert from data x coordinates to canvas/div Y coordinate and optional
754 * axis. Uses the first axis by default.
756 * returns a single value or null if y is null.
758 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
759 var pct
= this.toPercentYCoord(y
, axis
);
764 var area
= this.plotter_
.area
;
765 return area
.y
+ pct
* area
.h
;
769 * Convert from canvas/div coords to data coordinates.
770 * If specified, do this conversion for the coordinate system of a particular
771 * axis. Uses the first axis by default.
772 * Returns a two-element array: [X, Y].
774 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
775 * instead of toDataCoords(null, y, axis).
777 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
778 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
782 * Convert from canvas/div x coordinate to data coordinate.
784 * If x is null, this returns null.
786 Dygraph
.prototype.toDataXCoord
= function(x
) {
791 var area
= this.plotter_
.area
;
792 var xRange
= this.xAxisRange();
793 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
797 * Convert from canvas/div y coord to value.
799 * If y is null, this returns null.
800 * if axis is null, this uses the first axis.
802 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
807 var area
= this.plotter_
.area
;
808 var yRange
= this.yAxisRange(axis
);
810 if (typeof(axis
) == "undefined") axis
= 0;
811 if (!this.axes_
[axis
].logscale
) {
812 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
814 // Computing the inverse of toDomCoord.
815 var pct
= (y
- area
.y
) / area
.h
;
817 // Computing the inverse of toPercentYCoord. The function was arrived at with
818 // the following steps:
820 // Original calcuation:
821 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
823 // Move denominator to both sides:
824 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
826 // subtract logr1, and take the negative value.
827 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
829 // Swap both sides of the equation, and we can compute the log of the
830 // return value. Which means we just need to use that as the exponent in
832 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
834 var logr1
= Dygraph
.log10(yRange
[1]);
835 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
836 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
842 * Converts a y for an axis to a percentage from the top to the
843 * bottom of the drawing area.
845 * If the coordinate represents a value visible on the canvas, then
846 * the value will be between 0 and 1, where 0 is the top of the canvas.
847 * However, this method will return values outside the range, as
848 * values can fall outside the canvas.
850 * If y is null, this returns null.
851 * if axis is null, this uses the first axis.
853 * @param { Number } y The data y-coordinate.
854 * @param { Number } [axis] The axis number on which the data coordinate lives.
855 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
857 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
861 if (typeof(axis
) == "undefined") axis
= 0;
863 var yRange
= this.yAxisRange(axis
);
866 if (!this.axes_
[axis
].logscale
) {
867 // yRange[1] - y is unit distance from the bottom.
868 // yRange[1] - yRange[0] is the scale of the range.
869 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
870 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
872 var logr1
= Dygraph
.log10(yRange
[1]);
873 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
879 * Converts an x value to a percentage from the left to the right of
882 * If the coordinate represents a value visible on the canvas, then
883 * the value will be between 0 and 1, where 0 is the left of the canvas.
884 * However, this method will return values outside the range, as
885 * values can fall outside the canvas.
887 * If x is null, this returns null.
888 * @param { Number } x The data x-coordinate.
889 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
891 Dygraph
.prototype.toPercentXCoord
= function(x
) {
896 var xRange
= this.xAxisRange();
897 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
901 * Returns the number of columns (including the independent variable).
902 * @return { Integer } The number of columns.
904 Dygraph
.prototype.numColumns
= function() {
905 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
909 * Returns the number of rows (excluding any header/label row).
910 * @return { Integer } The number of rows, less any header.
912 Dygraph
.prototype.numRows
= function() {
913 return this.rawData_
.length
;
917 * Returns the full range of the x-axis, as determined by the most extreme
918 * values in the data set. Not affected by zooming, visibility, etc.
919 * TODO(danvk): merge w/ xAxisExtremes
920 * @return { Array<Number> } A [low, high] pair
923 Dygraph
.prototype.fullXRange_
= function() {
924 if (this.numRows() > 0) {
925 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
932 * Returns the value in the given row and column. If the row and column exceed
933 * the bounds on the data, returns null. Also returns null if the value is
935 * @param { Number} row The row number of the data (0-based). Row 0 is the
936 * first row of data, not a header row.
937 * @param { Number} col The column number of the data (0-based)
938 * @return { Number } The value in the specified cell or null if the row/col
941 Dygraph
.prototype.getValue
= function(row
, col
) {
942 if (row
< 0 || row
> this.rawData_
.length
) return null;
943 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
945 return this.rawData_
[row
][col
];
949 * Generates interface elements for the Dygraph: a containing div, a div to
950 * display the current point, and a textbox to adjust the rolling average
951 * period. Also creates the Renderer/Layout elements.
954 Dygraph
.prototype.createInterface_
= function() {
955 // Create the all-enclosing graph div
956 var enclosing
= this.maindiv_
;
958 this.graphDiv
= document
.createElement("div");
959 this.graphDiv
.style
.width
= this.width_
+ "px";
960 this.graphDiv
.style
.height
= this.height_
+ "px";
961 enclosing
.appendChild(this.graphDiv
);
963 // Create the canvas for interactive parts of the chart.
964 this.canvas_
= Dygraph
.createCanvas();
965 this.canvas_
.style
.position
= "absolute";
966 this.canvas_
.width
= this.width_
;
967 this.canvas_
.height
= this.height_
;
968 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
969 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
971 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
973 // ... and for static parts of the chart.
974 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
975 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
977 if (this.attr_('showRangeSelector')) {
978 // The range selector must be created here so that its canvases and contexts get created here.
979 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
980 this.rangeSelector_
= new DygraphRangeSelector(this);
983 // The interactive parts of the graph are drawn on top of the chart.
984 this.graphDiv
.appendChild(this.hidden_
);
985 this.graphDiv
.appendChild(this.canvas_
);
986 this.mouseEventElement_
= this.createMouseEventElement_();
988 // Create the grapher
989 this.layout_
= new DygraphLayout(this);
991 if (this.rangeSelector_
) {
992 // This needs to happen after the graph canvases are added to the div and the layout object is created.
993 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
998 this.mouseMoveHandler
= function(e
) {
999 dygraph
.mouseMove_(e
);
1001 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
1003 this.mouseOutHandler
= function(e
) {
1004 dygraph
.mouseOut_(e
);
1006 this.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
1008 this.createDragInterface_();
1010 this.resizeHandler
= function(e
) {
1014 // Update when the window is resized.
1015 // TODO(danvk): drop frames depending on complexity of the chart.
1016 this.addEvent(window
, 'resize', this.resizeHandler
);
1020 * Detach DOM elements in the dygraph and null out all data references.
1021 * Calling this when you're done with a dygraph can dramatically reduce memory
1022 * usage. See, e.g., the tests/perf.html example.
1024 Dygraph
.prototype.destroy
= function() {
1025 var removeRecursive
= function(node
) {
1026 while (node
.hasChildNodes()) {
1027 removeRecursive(node
.firstChild
);
1028 node
.removeChild(node
.firstChild
);
1032 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
1033 var reg
= this.registeredEvents_
[idx
];
1034 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
1036 this.registeredEvents_
= [];
1038 // remove mouse event handlers (This may not be necessary anymore)
1039 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
1040 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
1041 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseUpHandler_
);
1042 removeRecursive(this.maindiv_
);
1044 var nullOut
= function(obj
) {
1045 for (var n
in obj
) {
1046 if (typeof(obj
[n
]) === 'object') {
1051 // remove event handlers
1052 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
1053 this.resizeHandler
= null;
1054 // These may not all be necessary, but it can't hurt...
1055 nullOut(this.layout_
);
1056 nullOut(this.plotter_
);
1061 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1062 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1063 * or the zoom rectangles) is done on this.canvas_.
1064 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1065 * @return {Object} The newly-created canvas
1068 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1069 var h
= Dygraph
.createCanvas();
1070 h
.style
.position
= "absolute";
1071 // TODO(danvk): h should be offset from canvas. canvas needs to include
1072 // some extra area to make it easier to zoom in on the far left and far
1073 // right. h needs to be precisely the plot area, so that clipping occurs.
1074 h
.style
.top
= canvas
.style
.top
;
1075 h
.style
.left
= canvas
.style
.left
;
1076 h
.width
= this.width_
;
1077 h
.height
= this.height_
;
1078 h
.style
.width
= this.width_
+ "px"; // for IE
1079 h
.style
.height
= this.height_
+ "px"; // for IE
1084 * Creates an overlay element used to handle mouse events.
1085 * @return {Object} The mouse event element.
1088 Dygraph
.prototype.createMouseEventElement_
= function() {
1089 if (this.isUsingExcanvas_
) {
1090 var elem
= document
.createElement("div");
1091 elem
.style
.position
= 'absolute';
1092 elem
.style
.backgroundColor
= 'white';
1093 elem
.style
.filter
= 'alpha(opacity=0)';
1094 elem
.style
.width
= this.width_
+ "px";
1095 elem
.style
.height
= this.height_
+ "px";
1096 this.graphDiv
.appendChild(elem
);
1099 return this.canvas_
;
1104 * Generate a set of distinct colors for the data series. This is done with a
1105 * color wheel. Saturation/Value are customizable, and the hue is
1106 * equally-spaced around the color wheel. If a custom set of colors is
1107 * specified, that is used instead.
1110 Dygraph
.prototype.setColors_
= function() {
1111 var labels
= this.getLabels();
1112 var num
= labels
.length
- 1;
1114 this.colorsMap_
= {};
1115 var colors
= this.attr_('colors');
1118 var sat
= this.attr_('colorSaturation') || 1.0;
1119 var val
= this.attr_('colorValue') || 0.5;
1120 var half
= Math
.ceil(num
/ 2);
1121 for (i
= 1; i
<= num
; i
++) {
1122 if (!this.visibility()[i
-1]) continue;
1123 // alternate colors for high contrast.
1124 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1125 var hue
= (1.0 * idx
/ (1 + num
));
1126 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1127 this.colors_
.push(colorStr
);
1128 this.colorsMap_
[labels
[i
]] = colorStr
;
1131 for (i
= 0; i
< num
; i
++) {
1132 if (!this.visibility()[i
]) continue;
1133 var colorStr
= colors
[i
% colors
.length
];
1134 this.colors_
.push(colorStr
);
1135 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1141 * Return the list of colors. This is either the list of colors passed in the
1142 * attributes or the autogenerated list of rgb(r,g,b) strings.
1143 * This does not return colors for invisible series.
1144 * @return {Array<string>} The list of colors.
1146 Dygraph
.prototype.getColors
= function() {
1147 return this.colors_
;
1151 * Returns a few attributes of a series, i.e. its color, its visibility, which
1152 * axis it's assigned to, and its column in the original data.
1153 * Returns null if the series does not exist.
1154 * Otherwise, returns an object with column, visibility, color and axis properties.
1155 * The "axis" property will be set to 1 for y1 and 2 for y2.
1156 * The "column" property can be fed back into getValue(row, column) to get
1157 * values for this series.
1159 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1161 var labels
= this.getLabels();
1162 for (var i
= 1; i
< labels
.length
; i
++) {
1163 if (labels
[i
] == series_name
) {
1168 if (idx
== -1) return null;
1173 visible
: this.visibility()[idx
- 1],
1174 color
: this.colorsMap_
[series_name
],
1175 axis
: 1 + this.seriesToAxisMap_
[series_name
]
1180 * Create the text box to adjust the averaging period
1183 Dygraph
.prototype.createRollInterface_
= function() {
1184 // Create a roller if one doesn't exist already.
1185 if (!this.roller_
) {
1186 this.roller_
= document
.createElement("input");
1187 this.roller_
.type
= "text";
1188 this.roller_
.style
.display
= "none";
1189 this.graphDiv
.appendChild(this.roller_
);
1192 var display
= this.attr_('showRoller') ? 'block' : 'none';
1194 var area
= this.plotter_
.area
;
1195 var textAttr
= { "position": "absolute",
1197 "top": (area
.y
+ area
.h
- 25) + "px",
1198 "left": (area
.x
+ 1) + "px",
1201 this.roller_
.size
= "2";
1202 this.roller_
.value
= this.rollPeriod_
;
1203 for (var name
in textAttr
) {
1204 if (textAttr
.hasOwnProperty(name
)) {
1205 this.roller_
.style
[name
] = textAttr
[name
];
1210 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1215 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1216 * canvas (i.e. DOM Coords).
1218 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1219 return Dygraph
.pageX(e
) - context
.px
;
1224 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1225 * canvas (i.e. DOM Coords).
1227 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1228 return Dygraph
.pageY(e
) - context
.py
;
1232 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1236 Dygraph
.prototype.createDragInterface_
= function() {
1238 // Tracks whether the mouse is down right now
1240 isPanning
: false, // is this drag part of a pan?
1241 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1242 dragStartX
: null, // pixel coordinates
1243 dragStartY
: null, // pixel coordinates
1244 dragEndX
: null, // pixel coordinates
1245 dragEndY
: null, // pixel coordinates
1246 dragDirection
: null,
1247 prevEndX
: null, // pixel coordinates
1248 prevEndY
: null, // pixel coordinates
1249 prevDragDirection
: null,
1250 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1252 // The value on the left side of the graph when a pan operation starts.
1253 initialLeftmostDate
: null,
1255 // The number of units each pixel spans. (This won't be valid for log
1257 xUnitsPerPixel
: null,
1259 // TODO(danvk): update this comment
1260 // The range in second/value units that the viewport encompasses during a
1261 // panning operation.
1264 // Top-left corner of the canvas, in DOM coords
1265 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1269 // Values for use with panEdgeFraction, which limit how far outside the
1270 // graph's data boundaries it can be panned.
1271 boundedDates
: null, // [minDate, maxDate]
1272 boundedValues
: null, // [[minValue, maxValue] ...]
1274 // We cover iframes during mouse interactions. See comments in
1275 // dygraph-utils.js for more info on why this is a good idea.
1276 tarp
: new Dygraph
.IFrameTarp(),
1278 // contextB is the same thing as this context object but renamed.
1279 initializeMouseDown
: function(event
, g
, contextB
) {
1280 // prevents mouse drags from selecting page text.
1281 if (event
.preventDefault
) {
1282 event
.preventDefault(); // Firefox, Chrome, etc.
1284 event
.returnValue
= false; // IE
1285 event
.cancelBubble
= true;
1288 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1289 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1290 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1291 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1292 contextB
.cancelNextDblclick
= false;
1293 contextB
.tarp
.cover();
1297 var interactionModel
= this.attr_("interactionModel");
1299 // Self is the graph.
1302 // Function that binds the graph and context to the handler.
1303 var bindHandler
= function(handler
) {
1304 return function(event
) {
1305 handler(event
, self
, context
);
1309 for (var eventName
in interactionModel
) {
1310 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1311 this.addEvent(this.mouseEventElement_
, eventName
,
1312 bindHandler(interactionModel
[eventName
]));
1315 // If the user releases the mouse button during a drag, but not over the
1316 // canvas, then it doesn't count as a zooming action.
1317 this.mouseUpHandler_
= function(event
) {
1318 if (context
.isZooming
|| context
.isPanning
) {
1319 context
.isZooming
= false;
1320 context
.dragStartX
= null;
1321 context
.dragStartY
= null;
1324 if (context
.isPanning
) {
1325 context
.isPanning
= false;
1326 context
.draggingDate
= null;
1327 context
.dateRange
= null;
1328 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1329 delete self
.axes_
[i
].draggingValue
;
1330 delete self
.axes_
[i
].dragValueRange
;
1334 context
.tarp
.uncover();
1337 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1341 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1342 * up any previous zoom rectangles that were drawn. This could be optimized to
1343 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1346 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1347 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1348 * @param {Number} startX The X position where the drag started, in canvas
1350 * @param {Number} endX The current X position of the drag, in canvas coords.
1351 * @param {Number} startY The Y position where the drag started, in canvas
1353 * @param {Number} endY The current Y position of the drag, in canvas coords.
1354 * @param {Number} prevDirection the value of direction on the previous call to
1355 * this function. Used to avoid excess redrawing
1356 * @param {Number} prevEndX The value of endX on the previous call to this
1357 * function. Used to avoid excess redrawing
1358 * @param {Number} prevEndY The value of endY on the previous call to this
1359 * function. Used to avoid excess redrawing
1362 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1363 endY
, prevDirection
, prevEndX
,
1365 var ctx
= this.canvas_ctx_
;
1367 // Clean up from the previous rect if necessary
1368 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1369 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1370 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1371 } else if (prevDirection
== Dygraph
.VERTICAL
){
1372 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1373 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1376 // Draw a light-grey rectangle to show the new viewing area
1377 if (direction
== Dygraph
.HORIZONTAL
) {
1378 if (endX
&& startX
) {
1379 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1380 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1381 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1383 } else if (direction
== Dygraph
.VERTICAL
) {
1384 if (endY
&& startY
) {
1385 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1386 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1387 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1391 if (this.isUsingExcanvas_
) {
1392 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1397 * Clear the zoom rectangle (and perform no zoom).
1400 Dygraph
.prototype.clearZoomRect_
= function() {
1401 this.currentZoomRectArgs_
= null;
1402 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1406 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1407 * the canvas. The exact zoom window may be slightly larger if there are no data
1408 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1409 * which accepts dates that match the raw data. This function redraws the graph.
1411 * @param {Number} lowX The leftmost pixel value that should be visible.
1412 * @param {Number} highX The rightmost pixel value that should be visible.
1415 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1416 this.currentZoomRectArgs_
= null;
1417 // Find the earliest and latest dates contained in this canvasx range.
1418 // Convert the call to date ranges of the raw data.
1419 var minDate
= this.toDataXCoord(lowX
);
1420 var maxDate
= this.toDataXCoord(highX
);
1421 this.doZoomXDates_(minDate
, maxDate
);
1425 * Transition function to use in animations. Returns values between 0.0
1426 * (totally old values) and 1.0 (totally new values) for each frame.
1429 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1431 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1435 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1436 * method with doZoomX which accepts pixel coordinates. This function redraws
1439 * @param {Number} minDate The minimum date that should be visible.
1440 * @param {Number} maxDate The maximum date that should be visible.
1443 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1444 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1445 // can produce strange effects. Rather than the y-axis transitioning slowly
1446 // between values, it can jerk around.)
1447 var old_window
= this.xAxisRange();
1448 var new_window
= [minDate
, maxDate
];
1449 this.zoomed_x_
= true;
1451 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1452 if (that
.attr_("zoomCallback")) {
1453 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1459 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1460 * the canvas. This function redraws the graph.
1462 * @param {Number} lowY The topmost pixel value that should be visible.
1463 * @param {Number} highY The lowest pixel value that should be visible.
1466 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1467 this.currentZoomRectArgs_
= null;
1468 // Find the highest and lowest values in pixel range for each axis.
1469 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1470 // This is because pixels increase as you go down on the screen, whereas data
1471 // coordinates increase as you go up the screen.
1472 var oldValueRanges
= this.yAxisRanges();
1473 var newValueRanges
= [];
1474 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1475 var hi
= this.toDataYCoord(lowY
, i
);
1476 var low
= this.toDataYCoord(highY
, i
);
1477 newValueRanges
.push([low
, hi
]);
1480 this.zoomed_y_
= true;
1482 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1483 if (that
.attr_("zoomCallback")) {
1484 var xRange
= that
.xAxisRange();
1485 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1491 * Reset the zoom to the original view coordinates. This is the same as
1492 * double-clicking on the graph.
1496 Dygraph
.prototype.doUnzoom_
= function() {
1497 var dirty
= false, dirtyX
= false, dirtyY
= false;
1498 if (this.dateWindow_
!== null) {
1503 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1504 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1510 // Clear any selection, since it's likely to be drawn in the wrong place.
1511 this.clearSelection();
1514 this.zoomed_x_
= false;
1515 this.zoomed_y_
= false;
1517 var minDate
= this.rawData_
[0][0];
1518 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1520 // With only one frame, don't bother calculating extreme ranges.
1521 // TODO(danvk): merge this block w/ the code below
.
1522 if (!this.attr_("animatedZooms")) {
1523 this.dateWindow_
= null;
1524 for (i
= 0; i
< this.axes_
.length
; i
++) {
1525 if (this.axes_
[i
].valueWindow
!== null) {
1526 delete this.axes_
[i
].valueWindow
;
1530 if (this.attr_("zoomCallback")) {
1531 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1536 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1538 oldWindow
= this.xAxisRange();
1539 newWindow
= [minDate
, maxDate
];
1543 oldValueRanges
= this.yAxisRanges();
1544 // TODO(danvk): this is pretty inefficient
1545 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1546 var extremes
= packed
[1];
1548 // this has the side-effect of modifying this.axes_.
1549 // this doesn't make much sense in this context, but it's convenient (we
1550 // need this.axes_[*].extremeValues) and not harmful since we'll be
1551 // calling drawGraph_ shortly, which clobbers these values.
1552 this.computeYAxisRanges_(extremes
);
1554 newValueRanges
= [];
1555 for (i
= 0; i
< this.axes_
.length
; i
++) {
1556 var axis
= this.axes_
[i
];
1557 newValueRanges
.push((axis
.valueRange
!== null &&
1558 axis
.valueRange
!== undefined
) ?
1559 axis
.valueRange
: axis
.extremeRange
);
1564 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1566 that
.dateWindow_
= null;
1567 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1568 if (that
.axes_
[i
].valueWindow
!== null) {
1569 delete that
.axes_
[i
].valueWindow
;
1572 if (that
.attr_("zoomCallback")) {
1573 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1580 * Combined animation logic for all zoom functions.
1581 * either the x parameters or y parameters may be null.
1584 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1585 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1588 var valueRanges
= [];
1591 if (oldXRange
!== null && newXRange
!== null) {
1592 for (step
= 1; step
<= steps
; step
++) {
1593 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1594 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1595 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1599 if (oldYRanges
!== null && newYRanges
!== null) {
1600 for (step
= 1; step
<= steps
; step
++) {
1601 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1603 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1604 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1605 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1607 valueRanges
[step
-1] = thisRange
;
1612 Dygraph
.repeatAndCleanup(function(step
) {
1613 if (valueRanges
.length
) {
1614 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1615 var w
= valueRanges
[step
][i
];
1616 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1619 if (windows
.length
) {
1620 that
.dateWindow_
= windows
[step
];
1623 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1627 * Get the current graph's area object.
1629 * Returns: {x, y, w, h}
1631 Dygraph
.prototype.getArea
= function() {
1632 return this.plotter_
.area
;
1636 * Convert a mouse event to DOM coordinates relative to the graph origin.
1638 * Returns a two-element array: [X, Y].
1640 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1641 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1642 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1643 return [canvasx
, canvasy
];
1647 * Given a canvas X coordinate, find the closest row.
1648 * @param {Number} domX graph-relative DOM X coordinate
1649 * Returns: row number, integer
1652 Dygraph
.prototype.findClosestRow
= function(domX
) {
1653 var minDistX
= Infinity
;
1654 var pointIdx
= -1, setIdx
= -1;
1655 var sets
= this.layout_
.points
;
1656 for (var i
= 0; i
< sets
.length
; i
++) {
1657 var points
= sets
[i
];
1658 var len
= points
.length
;
1659 for (var j
= 0; j
< len
; j
++) {
1660 var point
= points
[j
];
1661 if (!Dygraph
.isValidPoint(point
, true)) continue;
1662 var dist
= Math
.abs(point
.canvasx
- domX
);
1663 if (dist
< minDistX
) {
1671 // TODO(danvk): remove this function; it's trivial and has only one use.
1672 return this.idxToRow_(setIdx
, pointIdx
);
1676 * Given canvas X,Y coordinates, find the closest point.
1678 * This finds the individual data point across all visible series
1679 * that's closest to the supplied DOM coordinates using the standard
1680 * Euclidean X,Y distance.
1682 * @param {Number} domX graph-relative DOM X coordinate
1683 * @param {Number} domY graph-relative DOM Y coordinate
1684 * Returns: {row, seriesName, point}
1687 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1688 var minDist
= Infinity
;
1690 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1691 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1692 var points
= this.layout_
.points
[setIdx
];
1693 for (var i
= 0; i
< points
.length
; ++i
) {
1694 var point
= points
[i
];
1695 if (!Dygraph
.isValidPoint(point
)) continue;
1696 dx
= point
.canvasx
- domX
;
1697 dy
= point
.canvasy
- domY
;
1698 dist
= dx
* dx
+ dy
* dy
;
1699 if (dist
< minDist
) {
1701 closestPoint
= point
;
1702 closestSeries
= setIdx
;
1707 var name
= this.layout_
.setNames
[closestSeries
];
1709 row
: idx
+ this.getLeftBoundary_(),
1716 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1718 * This first finds the X data point closest to the supplied DOM X coordinate,
1719 * then finds the series which puts the Y coordinate on top of its filled area,
1720 * using linear interpolation between adjacent point pairs.
1722 * @param {Number} domX graph-relative DOM X coordinate
1723 * @param {Number} domY graph-relative DOM Y coordinate
1724 * Returns: {row, seriesName, point}
1727 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1728 var row
= this.findClosestRow(domX
);
1729 var boundary
= this.getLeftBoundary_();
1730 var rowIdx
= row
- boundary
;
1731 var sets
= this.layout_
.points
;
1732 var closestPoint
, closestSeries
;
1733 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1734 var points
= this.layout_
.points
[setIdx
];
1735 if (rowIdx
>= points
.length
) continue;
1736 var p1
= points
[rowIdx
];
1737 if (!Dygraph
.isValidPoint(p1
)) continue;
1738 var py
= p1
.canvasy
;
1739 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1740 // interpolate series Y value using next point
1741 var p2
= points
[rowIdx
+ 1];
1742 if (Dygraph
.isValidPoint(p2
)) {
1743 var dx
= p2
.canvasx
- p1
.canvasx
;
1745 var r
= (domX
- p1
.canvasx
) / dx
;
1746 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1749 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1750 // interpolate series Y value using previous point
1751 var p0
= points
[rowIdx
- 1];
1752 if (Dygraph
.isValidPoint(p0
)) {
1753 var dx
= p1
.canvasx
- p0
.canvasx
;
1755 var r
= (p1
.canvasx
- domX
) / dx
;
1756 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1760 // Stop if the point (domX, py) is above this series' upper edge
1761 if (setIdx
=== 0 || py
< domY
) {
1763 closestSeries
= setIdx
;
1766 var name
= this.layout_
.setNames
[closestSeries
];
1775 * When the mouse moves in the canvas, display information about a nearby data
1776 * point and draw dots over those points in the data series. This function
1777 * takes care of cleanup of previously-drawn dots.
1778 * @param {Object} event The mousemove event from the browser.
1781 Dygraph
.prototype.mouseMove_
= function(event
) {
1782 // This prevents JS errors when mousing over the canvas before data loads.
1783 var points
= this.layout_
.points
;
1784 if (points
=== undefined
|| points
=== null) return;
1786 var canvasCoords
= this.eventToDomCoords(event
);
1787 var canvasx
= canvasCoords
[0];
1788 var canvasy
= canvasCoords
[1];
1790 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1791 var selectionChanged
= false;
1792 if (highlightSeriesOpts
&& !this.lockedSet_
) {
1794 if (this.attr_("stackedGraph")) {
1795 closest
= this.findStackedPoint(canvasx
, canvasy
);
1797 closest
= this.findClosestPoint(canvasx
, canvasy
);
1799 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1801 var idx
= this.findClosestRow(canvasx
);
1802 selectionChanged
= this.setSelection(idx
);
1805 var callback
= this.attr_("highlightCallback");
1806 if (callback
&& selectionChanged
) {
1807 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1812 * Fetch left offset from first defined boundaryIds record (see bug #236).
1815 Dygraph
.prototype.getLeftBoundary_
= function() {
1816 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1817 if (this.boundaryIds_
[i
] !== undefined
) {
1818 return this.boundaryIds_
[i
][0];
1825 * Transforms layout_.points index into data row number.
1826 * @param int layout_.points index
1827 * @return int row number, or -1 if none could be found.
1830 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1831 if (rowIdx
< 0) return -1;
1833 var boundary
= this.getLeftBoundary_();
1834 return boundary
+ rowIdx
;
1835 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1836 // var set = this.layout_.datasets[setIdx];
1837 // if (idx < set.length) {
1838 // return boundary + idx;
1840 // idx -= set.length;
1845 Dygraph
.prototype.animateSelection_
= function(direction
) {
1846 var totalSteps
= 10;
1848 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1849 if (this.animateId
=== undefined
) this.animateId
= 0;
1850 var start
= this.fadeLevel
;
1851 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1853 if (this.fadeLevel
) {
1854 this.updateSelection_(1.0);
1859 var thisId
= ++this.animateId
;
1861 Dygraph
.repeatAndCleanup(
1863 // ignore simultaneous animations
1864 if (that
.animateId
!= thisId
) return;
1866 that
.fadeLevel
+= direction
;
1867 if (that
.fadeLevel
=== 0) {
1868 that
.clearSelection();
1870 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1873 steps
, millis
, function() {});
1877 * Draw dots over the selectied points in the data series. This function
1878 * takes care of cleanup of previously-drawn dots.
1881 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1882 var defaultPrevented
= this.cascadeEvents_('select', {
1883 selectedX
: this.lastx_
,
1884 selectedPoints
: this.selPoints_
1886 // TODO(danvk): use defaultPrevented here?
1888 // Clear the previously drawn vertical, if there is one
1890 var ctx
= this.canvas_ctx_
;
1891 if (this.attr_('highlightSeriesOpts')) {
1892 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1893 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1895 // Activating background fade includes an animation effect for a gradual
1896 // fade. TODO(klausw): make this independently configurable if it causes
1897 // issues? Use a shared preference to control animations?
1898 var animateBackgroundFade
= true;
1899 if (animateBackgroundFade
) {
1900 if (opt_animFraction
=== undefined
) {
1901 // start a new animation
1902 this.animateSelection_(1);
1905 alpha
*= opt_animFraction
;
1907 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1908 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1911 // Redraw only the highlighted series in the interactive canvas (not the
1912 // static plot canvas, which is where series are usually drawn).
1913 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1914 } else if (this.previousVerticalX_
>= 0) {
1915 // Determine the maximum highlight circle size.
1916 var maxCircleSize
= 0;
1917 var labels
= this.attr_('labels');
1918 for (i
= 1; i
< labels
.length
; i
++) {
1919 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1920 if (r
> maxCircleSize
) maxCircleSize
= r
;
1922 var px
= this.previousVerticalX_
;
1923 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1924 2 * maxCircleSize
+ 2, this.height_
);
1927 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1928 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1931 if (this.selPoints_
.length
> 0) {
1932 // Draw colored circles over the center of each selected point
1933 var canvasx
= this.selPoints_
[0].canvasx
;
1935 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1936 var pt
= this.selPoints_
[i
];
1937 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1939 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1940 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1941 var color
= this.plotter_
.colors
[pt
.name
];
1943 callback
= Dygraph
.Circles
.DEFAULT
;
1945 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1946 ctx
.strokeStyle
= color
;
1947 ctx
.fillStyle
= color
;
1948 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1953 this.previousVerticalX_
= canvasx
;
1958 * Manually set the selected points and display information about them in the
1959 * legend. The selection can be cleared using clearSelection() and queried
1960 * using getSelection().
1961 * @param { Integer } row number that should be highlighted (i.e. appear with
1962 * hover dots on the chart). Set to false to clear any selection.
1963 * @param { seriesName } optional series name to highlight that series with the
1964 * the highlightSeriesOpts setting.
1965 * @param { locked } optional If true, keep seriesName selected when mousing
1966 * over the graph, disabling closest-series highlighting. Call clearSelection()
1969 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1970 // Extract the points we've selected
1971 this.selPoints_
= [];
1973 if (row
!== false) {
1974 row
-= this.getLeftBoundary_();
1977 var changed
= false;
1978 if (row
!== false && row
>= 0) {
1979 if (row
!= this.lastRow_
) changed
= true;
1980 this.lastRow_
= row
;
1981 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1982 var set
= this.layout_
.datasets
[setIdx
];
1983 if (row
< set
.length
) {
1984 var point
= this.layout_
.points
[setIdx
][row
];
1986 if (this.attr_("stackedGraph")) {
1987 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1990 if (point
.yval
!== null) this.selPoints_
.push(point
);
1994 if (this.lastRow_
>= 0) changed
= true;
1998 if (this.selPoints_
.length
) {
1999 this.lastx_
= this.selPoints_
[0].xval
;
2004 if (opt_seriesName
!== undefined
) {
2005 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
2006 this.highlightSet_
= opt_seriesName
;
2009 if (opt_locked
!== undefined
) {
2010 this.lockedSet_
= opt_locked
;
2014 this.updateSelection_(undefined
);
2020 * The mouse has left the canvas. Clear out whatever artifacts remain
2021 * @param {Object} event the mouseout event from the browser.
2024 Dygraph
.prototype.mouseOut_
= function(event
) {
2025 if (this.attr_("unhighlightCallback")) {
2026 this.attr_("unhighlightCallback")(event
);
2029 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
2030 this.clearSelection();
2035 * Clears the current selection (i.e. points that were highlighted by moving
2036 * the mouse over the chart).
2038 Dygraph
.prototype.clearSelection
= function() {
2039 this.cascadeEvents_('deselect', {});
2041 this.lockedSet_
= false;
2042 // Get rid of the overlay data
2043 if (this.fadeLevel
) {
2044 this.animateSelection_(-1);
2047 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2049 this.selPoints_
= [];
2052 this.highlightSet_
= null;
2056 * Returns the number of the currently selected row. To get data for this row,
2057 * you can use the getValue method.
2058 * @return { Integer } row number, or -1 if nothing is selected
2060 Dygraph
.prototype.getSelection
= function() {
2061 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2065 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2066 var points
= this.layout_
.points
[setIdx
];
2067 for (var row
= 0; row
< points
.length
; row
++) {
2068 if (points
[row
].x
== this.selPoints_
[0].x
) {
2069 return row
+ this.getLeftBoundary_();
2077 * Returns the name of the currently-highlighted series.
2078 * Only available when the highlightSeriesOpts option is in use.
2080 Dygraph
.prototype.getHighlightSeries
= function() {
2081 return this.highlightSet_
;
2085 * Fires when there's data available to be graphed.
2086 * @param {String} data Raw CSV data to be plotted
2089 Dygraph
.prototype.loadedEvent_
= function(data
) {
2090 this.rawData_
= this.parseCSV_(data
);
2095 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2098 Dygraph
.prototype.addXTicks_
= function() {
2099 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2101 if (this.dateWindow_
) {
2102 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2104 range
= this.fullXRange_();
2107 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2108 var xTicks
= xAxisOptionsView('ticker')(
2111 this.width_
, // TODO(danvk): should be area.width
2114 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2115 // console.log(msg);
2116 this.layout_
.setXTicks(xTicks
);
2121 * Computes the range of the data series (including confidence intervals).
2122 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2123 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2124 * @return [low, high]
2126 Dygraph
.prototype.extremeValues_
= function(series
) {
2127 var minY
= null, maxY
= null, j
, y
;
2129 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2131 // With custom bars, maxY is the max of the high values.
2132 for (j
= 0; j
< series
.length
; j
++) {
2133 y
= series
[j
][1][0];
2134 if (y
=== null || isNaN(y
)) continue;
2135 var low
= y
- series
[j
][1][1];
2136 var high
= y
+ series
[j
][1][2];
2137 if (low
> y
) low
= y
; // this can happen with custom bars,
2138 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2139 if (maxY
=== null || high
> maxY
) {
2142 if (minY
=== null || low
< minY
) {
2147 for (j
= 0; j
< series
.length
; j
++) {
2149 if (y
=== null || isNaN(y
)) continue;
2150 if (maxY
=== null || y
> maxY
) {
2153 if (minY
=== null || y
< minY
) {
2159 return [minY
, maxY
];
2164 * This function is called once when the chart's data is changed or the options
2165 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2166 * idea is that values derived from the chart's data can be computed here,
2167 * rather than every time the chart is drawn. This includes things like the
2168 * number of axes, rolling averages, etc.
2170 Dygraph
.prototype.predraw_
= function() {
2171 var start
= new Date();
2173 // TODO(danvk): move more computations out of drawGraph_ and into here.
2174 this.computeYAxes_();
2176 // Create a new plotter.
2177 if (this.plotter_
) {
2178 this.cascadeEvents_('clearChart');
2179 this.plotter_
.clear();
2181 this.plotter_
= new DygraphCanvasRenderer(this,
2186 // The roller sits in the bottom left corner of the chart. We don't know where
2187 // this will be until the options are available, so it's positioned here.
2188 this.createRollInterface_();
2190 this.cascadeEvents_('predraw');
2192 if (this.rangeSelector_
) {
2193 this.rangeSelector_
.renderStaticLayer();
2196 // Convert the raw data (a 2D array) into the internal format and compute
2197 // rolling averages.
2198 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2199 for (var i
= 1; i
< this.numColumns(); i
++) {
2200 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2201 var logScale
= this.attr_('logscale');
2202 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2203 series
= this.rollingAverage(series
, this.rollPeriod_
);
2204 this.rolledSeries_
.push(series
);
2207 // If the data or options have changed, then we'd better redraw.
2210 // This is used to determine whether to do various animations.
2211 var end
= new Date();
2212 this.drawingTimeMs_
= (end
- start
);
2216 * Loop over all fields and create datasets, calculating extreme y-values for
2217 * each series and extreme x-indices as we go.
2219 * dateWindow is passed in as an explicit parameter so that we can compute
2220 * extreme values "speculatively", i.e. without actually setting state on the
2223 * TODO(danvk): make this more of a true function
2224 * @return [ datasets, seriesExtremes, boundaryIds ]
2227 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2228 var boundaryIds
= [];
2229 var cumulative_y
= []; // For stacked series.
2231 var extremes
= {}; // series name -> [low, high]
2234 // Loop over the fields (series). Go from the last to the first,
2235 // because if they're stacked that's how we accumulate the values.
2236 var num_series
= rolledSeries
.length
- 1;
2237 for (i
= num_series
; i
>= 1; i
--) {
2238 if (!this.visibility()[i
- 1]) continue;
2240 // Note: this copy _is_ necessary at the moment.
2241 // If you remove it, it breaks zooming with error bars on.
2242 // TODO(danvk): investigate further & write a test for this.
2244 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2245 series
.push(rolledSeries
[i
][j
]);
2248 // Prune down to the desired range, if necessary (for zooming)
2249 // Because there can be lines going to points outside of the visible area,
2250 // we actually prune to visible points, plus one on either side.
2251 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2253 var low
= dateWindow
[0];
2254 var high
= dateWindow
[1];
2256 // TODO(danvk): do binary search instead of linear search.
2257 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2258 var firstIdx
= null, lastIdx
= null;
2259 for (k
= 0; k
< series
.length
; k
++) {
2260 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2263 if (series
[k
][0] <= high
) {
2267 if (firstIdx
=== null) firstIdx
= 0;
2268 if (firstIdx
> 0) firstIdx
--;
2269 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2270 if (lastIdx
< series
.length
- 1) lastIdx
++;
2271 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2272 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2273 pruned
.push(series
[k
]);
2277 boundaryIds
[i
-1] = [0, series
.length
-1];
2280 var seriesExtremes
= this.extremeValues_(series
);
2283 for (j
=0; j
<series
.length
; j
++) {
2284 series
[j
] = [series
[j
][0],
2289 } else if (this.attr_("stackedGraph")) {
2290 var l
= series
.length
;
2292 for (j
= 0; j
< l
; j
++) {
2293 // If one data set has a NaN, let all subsequent stacked
2294 // sets inherit the NaN -- only start at 0 for the first set.
2295 var x
= series
[j
][0];
2296 if (cumulative_y
[x
] === undefined
) {
2297 cumulative_y
[x
] = 0;
2300 actual_y
= series
[j
][1];
2301 if (actual_y
=== null) {
2302 series
[j
] = [x
, null];
2306 cumulative_y
[x
] += actual_y
;
2308 series
[j
] = [x
, cumulative_y
[x
]];
2310 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2311 seriesExtremes
[1] = cumulative_y
[x
];
2313 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2314 seriesExtremes
[0] = cumulative_y
[x
];
2319 var seriesName
= this.attr_("labels")[i
];
2320 extremes
[seriesName
] = seriesExtremes
;
2321 datasets
[i
] = series
;
2324 // For stacked graphs, a NaN value for any point in the sum should create a
2325 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2326 if (this.attr_("stackedGraph")) {
2327 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2328 // Use the first nonempty dataset to get X values.
2329 if (!datasets
[k
]) continue;
2330 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2331 var x
= datasets
[k
][j
][0];
2332 if (isNaN(cumulative_y
[x
])) {
2333 // Set all Y values to NaN at that X value.
2334 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2335 if (!datasets
[i
]) continue;
2336 datasets
[i
][j
][1] = NaN
;
2344 return [ datasets
, extremes
, boundaryIds
];
2348 * Update the graph with new data. This method is called when the viewing area
2349 * has changed. If the underlying data or options have changed, predraw_ will
2350 * be called before drawGraph_ is called.
2354 Dygraph
.prototype.drawGraph_
= function() {
2355 var start
= new Date();
2357 // This is used to set the second parameter to drawCallback, below.
2358 var is_initial_draw
= this.is_initial_draw_
;
2359 this.is_initial_draw_
= false;
2361 this.layout_
.removeAllDatasets();
2363 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2365 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2366 var datasets
= packed
[0];
2367 var extremes
= packed
[1];
2368 this.boundaryIds_
= packed
[2];
2370 this.setIndexByName_
= {};
2371 var labels
= this.attr_("labels");
2372 if (labels
.length
> 0) {
2373 this.setIndexByName_
[labels
[0]] = 0;
2376 for (var i
= 1; i
< datasets
.length
; i
++) {
2377 this.setIndexByName_
[labels
[i
]] = i
;
2378 if (!this.visibility()[i
- 1]) continue;
2379 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2380 this.datasetIndex_
[i
] = dataIdx
++;
2383 this.computeYAxisRanges_(extremes
);
2384 this.layout_
.setYAxes(this.axes_
);
2388 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2389 var tmp_zoomed_x
= this.zoomed_x_
;
2390 // Tell PlotKit to use this new data and render itself
2391 this.layout_
.setDateWindow(this.dateWindow_
);
2392 this.zoomed_x_
= tmp_zoomed_x
;
2393 this.layout_
.evaluateWithError();
2394 this.renderGraph_(is_initial_draw
);
2396 if (this.attr_("timingName")) {
2397 var end
= new Date();
2399 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2405 * This does the work of drawing the chart. It assumes that the layout and axis
2406 * scales have already been set (e.g. by predraw_).
2410 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2411 this.cascadeEvents_('clearChart');
2412 this.plotter_
.clear();
2414 if (this.attr_('underlayCallback')) {
2415 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2416 // users who expect a deprecated form of this callback.
2417 this.attr_('underlayCallback')(
2418 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2422 canvas
: this.hidden_
,
2423 drawingContext
: this.hidden_ctx_
2425 this.cascadeEvents_('willDrawChart', e
);
2426 this.plotter_
.render();
2427 this.cascadeEvents_('didDrawChart', e
);
2429 // TODO(danvk): is this a performance bottleneck when panning?
2430 // The interaction canvas should already be empty in that situation.
2431 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2432 this.canvas_
.height
);
2434 // Generate a static legend before any particular point is selected.
2436 if (this.rangeSelector_
) {
2437 this.rangeSelector_
.renderInteractiveLayer();
2439 if (this.attr_("drawCallback") !== null) {
2440 this.attr_("drawCallback")(this, is_initial_draw
);
2446 * Determine properties of the y-axes which are independent of the data
2447 * currently being displayed. This includes things like the number of axes and
2448 * the style of the axes. It does not include the range of each axis and its
2450 * This fills in this.axes_ and this.seriesToAxisMap_.
2451 * axes_ = [ { options } ]
2452 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2453 * indices are into the axes_ array.
2455 Dygraph
.prototype.computeYAxes_
= function() {
2456 // Preserve valueWindow settings if they exist, and if the user hasn't
2457 // specified a new valueRange.
2458 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2459 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2461 for (index
= 0; index
< this.axes_
.length
; index
++) {
2462 valueWindows
.push(this.axes_
[index
].valueWindow
);
2466 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2467 this.seriesToAxisMap_
= {};
2469 // Get a list of series names.
2470 var labels
= this.attr_("labels");
2472 for (i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2474 // all options which could be applied per-axis:
2482 'axisLabelFontSize',
2487 // Copy global axis options over to the first axis.
2488 for (i
= 0; i
< axisOptions
.length
; i
++) {
2489 var k
= axisOptions
[i
];
2491 if (v
) this.axes_
[0][k
] = v
;
2494 // Go through once and add all the axes.
2495 for (seriesName
in series
) {
2496 if (!series
.hasOwnProperty(seriesName
)) continue;
2497 axis
= this.attr_("axis", seriesName
);
2498 if (axis
=== null) {
2499 this.seriesToAxisMap_
[seriesName
] = 0;
2502 if (typeof(axis
) == 'object') {
2503 // Add a new axis, making a copy of its per-axis options.
2505 Dygraph
.update(opts
, this.axes_
[0]);
2506 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2507 var yAxisId
= this.axes_
.length
;
2508 opts
.yAxisId
= yAxisId
;
2510 Dygraph
.update(opts
, axis
);
2511 this.axes_
.push(opts
);
2512 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2516 // Go through one more time and assign series to an axis defined by another
2517 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2518 for (seriesName
in series
) {
2519 if (!series
.hasOwnProperty(seriesName
)) continue;
2520 axis
= this.attr_("axis", seriesName
);
2521 if (typeof(axis
) == 'string') {
2522 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2523 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2524 "series " + axis
+ ", which does not define its own axis.");
2527 var idx
= this.seriesToAxisMap_
[axis
];
2528 this.seriesToAxisMap_
[seriesName
] = idx
;
2532 if (valueWindows
!== undefined
) {
2533 // Restore valueWindow settings.
2534 for (index
= 0; index
< valueWindows
.length
; index
++) {
2535 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2540 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2542 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2543 v
= opts("valueRange");
2544 if (v
) this.axes_
[axis
].valueRange
= v
;
2545 } else { // To keep old behavior
2546 var axes
= this.user_attrs_
.axes
;
2547 if (axes
&& axes
.y2
) {
2548 v
= axes
.y2
.valueRange
;
2549 if (v
) this.axes_
[axis
].valueRange
= v
;
2557 * Returns the number of y-axes on the chart.
2558 * @return {Number} the number of axes.
2560 Dygraph
.prototype.numAxes
= function() {
2562 for (var series
in this.seriesToAxisMap_
) {
2563 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2564 var idx
= this.seriesToAxisMap_
[series
];
2565 if (idx
> last_axis
) last_axis
= idx
;
2567 return 1 + last_axis
;
2572 * Returns axis properties for the given series.
2573 * @param { String } setName The name of the series for which to get axis
2574 * properties, e.g. 'Y1'.
2575 * @return { Object } The axis properties.
2577 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2578 // TODO(danvk): handle errors.
2579 return this.axes_
[this.seriesToAxisMap_
[series
]];
2584 * Determine the value range and tick marks for each axis.
2585 * @param {Object} extremes A mapping from seriesName -> [low, high]
2586 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2588 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2589 // Build a map from axis number -> [list of series names]
2590 var seriesForAxis
= [], series
;
2591 for (series
in this.seriesToAxisMap_
) {
2592 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2593 var idx
= this.seriesToAxisMap_
[series
];
2594 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2595 seriesForAxis
[idx
].push(series
);
2598 // Compute extreme values, a span and tick marks for each axis.
2599 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2600 var axis
= this.axes_
[i
];
2602 if (!seriesForAxis
[i
]) {
2603 // If no series are defined or visible then use a reasonable default
2604 axis
.extremeRange
= [0, 1];
2606 // Calculate the extremes of extremes.
2607 series
= seriesForAxis
[i
];
2608 var minY
= Infinity
; // extremes[series[0]][0];
2609 var maxY
= -Infinity
; // extremes[series[0]][1];
2610 var extremeMinY
, extremeMaxY
;
2612 for (var j
= 0; j
< series
.length
; j
++) {
2613 // this skips invisible series
2614 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2616 // Only use valid extremes to stop null data series' from corrupting the scale.
2617 extremeMinY
= extremes
[series
[j
]][0];
2618 if (extremeMinY
!== null) {
2619 minY
= Math
.min(extremeMinY
, minY
);
2621 extremeMaxY
= extremes
[series
[j
]][1];
2622 if (extremeMaxY
!== null) {
2623 maxY
= Math
.max(extremeMaxY
, maxY
);
2626 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2628 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2629 if (minY
== Infinity
) minY
= 0;
2630 if (maxY
== -Infinity
) maxY
= 1;
2632 // Add some padding and round up to an integer to be human-friendly.
2633 var span
= maxY
- minY
;
2634 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2635 if (span
=== 0) { span
= maxY
; }
2637 var maxAxisY
, minAxisY
;
2638 if (axis
.logscale
) {
2639 maxAxisY
= maxY
+ 0.1 * span
;
2642 maxAxisY
= maxY
+ 0.1 * span
;
2643 minAxisY
= minY
- 0.1 * span
;
2645 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2646 if (!this.attr_("avoidMinZero")) {
2647 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2648 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2651 if (this.attr_("includeZero")) {
2652 if (maxY
< 0) maxAxisY
= 0;
2653 if (minY
> 0) minAxisY
= 0;
2656 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2658 if (axis
.valueWindow
) {
2659 // This is only set if the user has zoomed on the y-axis. It is never set
2660 // by a user. It takes precedence over axis.valueRange because, if you set
2661 // valueRange, you'd still expect to be able to pan.
2662 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2663 } else if (axis
.valueRange
) {
2664 // This is a user-set value range for this axis.
2665 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2667 axis
.computedValueRange
= axis
.extremeRange
;
2670 // Add ticks. By default, all axes inherit the tick positions of the
2671 // primary axis. However, if an axis is specifically marked as having
2672 // independent ticks, then that is permissible as well.
2673 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2674 var ticker
= opts('ticker');
2675 if (i
=== 0 || axis
.independentTicks
) {
2676 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2677 axis
.computedValueRange
[1],
2678 this.height_
, // TODO(danvk): should be area.height
2682 var p_axis
= this.axes_
[0];
2683 var p_ticks
= p_axis
.ticks
;
2684 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2685 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2686 var tick_values
= [];
2687 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2688 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2689 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2690 tick_values
.push(y_val
);
2693 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2694 axis
.computedValueRange
[1],
2695 this.height_
, // TODO(danvk): should be area.height
2704 * Extracts one series from the raw data (a 2D array) into an array of (date,
2707 * This is where undesirable points (i.e. negative values on log scales and
2708 * missing values through which we wish to connect lines) are dropped.
2709 * TODO(danvk): the "missing values" bit above doesn't seem right.
2713 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2714 // TODO(danvk): pre-allocate series here.
2716 for (var j
= 0; j
< rawData
.length
; j
++) {
2717 var x
= rawData
[j
][0];
2718 var point
= rawData
[j
][i
];
2720 // On the log scale, points less than zero do not exist.
2721 // This will create a gap in the chart.
2726 series
.push([x
, point
]);
2733 * Calculates the rolling average of a data set.
2734 * If originalData is [label, val], rolls the average of those.
2735 * If originalData is [label, [, it's interpreted as [value, stddev]
2736 * and the roll is returned in the same form, with appropriately reduced
2737 * stddev for each value.
2738 * Note that this is where fractional input (i.e. '5/10') is converted into
2740 * @param {Array} originalData The data in the appropriate format (see above)
2741 * @param {Number} rollPeriod The number of points over which to average the
2744 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2745 if (originalData
.length
< 2)
2746 return originalData
;
2747 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2748 var rollingData
= [];
2749 var sigma
= this.attr_("sigma");
2751 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2752 if (this.fractions_
) {
2754 var den
= 0; // numerator/denominator
2756 for (i
= 0; i
< originalData
.length
; i
++) {
2757 num
+= originalData
[i
][1][0];
2758 den
+= originalData
[i
][1][1];
2759 if (i
- rollPeriod
>= 0) {
2760 num
-= originalData
[i
- rollPeriod
][1][0];
2761 den
-= originalData
[i
- rollPeriod
][1][1];
2764 var date
= originalData
[i
][0];
2765 var value
= den
? num
/ den
: 0.0;
2766 if (this.attr_("errorBars")) {
2767 if (this.attr_("wilsonInterval")) {
2768 // For more details on this confidence interval, see:
2769 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2771 var p
= value
< 0 ? 0 : value
, n
= den
;
2772 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2773 var denom
= 1 + sigma
* sigma
/ den
;
2774 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2775 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2776 rollingData
[i
] = [date
,
2777 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2779 rollingData
[i
] = [date
, [0, 0, 0]];
2782 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2783 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2786 rollingData
[i
] = [date
, mult
* value
];
2789 } else if (this.attr_("customBars")) {
2794 for (i
= 0; i
< originalData
.length
; i
++) {
2795 var data
= originalData
[i
][1];
2797 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2799 if (y
!== null && !isNaN(y
)) {
2805 if (i
- rollPeriod
>= 0) {
2806 var prev
= originalData
[i
- rollPeriod
];
2807 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2815 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2816 1.0 * (mid
- low
) / count
,
2817 1.0 * (high
- mid
) / count
]];
2819 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2823 // Calculate the rolling average for the first rollPeriod - 1 points where
2824 // there is not enough data to roll over the full number of points
2825 if (!this.attr_("errorBars")){
2826 if (rollPeriod
== 1) {
2827 return originalData
;
2830 for (i
= 0; i
< originalData
.length
; i
++) {
2833 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2834 y
= originalData
[j
][1];
2835 if (y
=== null || isNaN(y
)) continue;
2837 sum
+= originalData
[j
][1];
2840 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2842 rollingData
[i
] = [originalData
[i
][0], null];
2847 for (i
= 0; i
< originalData
.length
; i
++) {
2851 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2852 y
= originalData
[j
][1][0];
2853 if (y
=== null || isNaN(y
)) continue;
2855 sum
+= originalData
[j
][1][0];
2856 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2859 stddev
= Math
.sqrt(variance
) / num_ok
;
2860 rollingData
[i
] = [originalData
[i
][0],
2861 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2863 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2873 * Detects the type of the str (date or numeric) and sets the various
2874 * formatting attributes in this.attrs_ based on this type.
2875 * @param {String} str An x value.
2878 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2880 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2881 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2882 str
.indexOf('/') >= 0 ||
2883 isNaN(parseFloat(str
))) {
2885 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2886 // TODO(danvk): remove support for this format.
2891 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2892 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2893 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2894 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2896 /** @private (shut up, jsdoc!) */
2897 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2898 // TODO(danvk): use Dygraph.numberValueFormatter here?
2899 /** @private (shut up, jsdoc!) */
2900 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2901 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2902 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2907 * Parses the value as a floating point number. This is like the parseFloat()
2908 * built-in, but with a few differences:
2909 * - the empty string is parsed as null, rather than NaN.
2910 * - if the string cannot be parsed at all, an error is logged.
2911 * If the string can't be parsed, this method returns null.
2912 * @param {String} x The string to be parsed
2913 * @param {Number} opt_line_no The line number from which the string comes.
2914 * @param {String} opt_line The text of the line from which the string comes.
2918 // Parse the x as a float or return null if it's not a number.
2919 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2920 var val
= parseFloat(x
);
2921 if (!isNaN(val
)) return val
;
2923 // Try to figure out what happeend.
2924 // If the value is the empty string, parse it as null.
2925 if (/^ *$/.test(x
)) return null;
2927 // If it was actually "NaN", return it as NaN.
2928 if (/^ *nan *$/i.test(x
)) return NaN
;
2930 // Looks like a parsing error.
2931 var msg
= "Unable to parse '" + x
+ "' as a number";
2932 if (opt_line
!== null && opt_line_no
!== null) {
2933 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2942 * Parses a string in a special csv format. We expect a csv file where each
2943 * line is a date point, and the first field in each line is the date string.
2944 * We also expect that all remaining fields represent series.
2945 * if the errorBars attribute is set, then interpret the fields as:
2946 * date, series1, stddev1, series2, stddev2, ...
2947 * @param {[Object]} data See above.
2949 * @return [Object] An array with one entry for each row. These entries
2950 * are an array of cells in that row. The first entry is the parsed x-value for
2951 * the row. The second, third, etc. are the y-values. These can take on one of
2952 * three forms, depending on the CSV and constructor parameters:
2954 * 2. [ value, stddev ]
2955 * 3. [ low value, center value, high value ]
2957 Dygraph
.prototype.parseCSV_
= function(data
) {
2959 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2960 var lines
= data
.split(line_delimiter
|| "\n");
2963 // Use the default delimiter or fall back to a tab if that makes sense.
2964 var delim
= this.attr_('delimiter');
2965 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2970 if (!('labels' in this.user_attrs_
)) {
2971 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2973 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2974 this.attributes_
.reparseSeries();
2979 var defaultParserSet
= false; // attempt to auto-detect x value type
2980 var expectedCols
= this.attr_("labels").length
;
2981 var outOfOrder
= false;
2982 for (var i
= start
; i
< lines
.length
; i
++) {
2983 var line
= lines
[i
];
2985 if (line
.length
=== 0) continue; // skip blank lines
2986 if (line
[0] == '#') continue; // skip comment lines
2987 var inFields
= line
.split(delim
);
2988 if (inFields
.length
< 2) continue;
2991 if (!defaultParserSet
) {
2992 this.detectTypeFromString_(inFields
[0]);
2993 xParser
= this.attr_("xValueParser");
2994 defaultParserSet
= true;
2996 fields
[0] = xParser(inFields
[0], this);
2998 // If fractions are expected, parse the numbers as "A/B
"
2999 if (this.fractions_) {
3000 for (j = 1; j < inFields.length; j++) {
3001 // TODO(danvk): figure out an appropriate way to flag parse errors.
3002 vals = inFields[j].split("/");
3003 if (vals.length != 2) {
3004 this.error('Expected fractional "num
/den
" values in CSV data ' +
3005 "but found a value
'" + inFields[j] + "' on line
" +
3006 (1 + i) + " ('" + line + "') which is not of
this form
.");
3009 fields[j] = [this.parseFloat_(vals[0], i, line),
3010 this.parseFloat_(vals[1], i, line)];
3013 } else if (this.attr_("errorBars
")) {
3014 // If there are error bars, values are (value, stddev) pairs
3015 if (inFields.length % 2 != 1) {
3016 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
3017 'but line ' + (1 + i) + ' has an odd number of values (' +
3018 (inFields.length - 1) + "): '" + line + "'");
3020 for (j = 1; j < inFields.length; j += 2) {
3021 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
3022 this.parseFloat_(inFields[j + 1], i, line)];
3024 } else if (this.attr_("customBars
")) {
3025 // Bars are a low;center;high tuple
3026 for (j = 1; j < inFields.length; j++) {
3027 var val = inFields[j];
3028 if (/^ *$/.test(val)) {
3029 fields[j] = [null, null, null];
3031 vals = val.split(";");
3032 if (vals.length == 3) {
3033 fields[j] = [ this.parseFloat_(vals[0], i, line),
3034 this.parseFloat_(vals[1], i, line),
3035 this.parseFloat_(vals[2], i, line) ];
3037 this.warn('When using customBars, values must be either blank ' +
3038 'or "low
;center
;high
" tuples (got "' + val +
3039 '" on line ' + (1+i));
3044 // Values are just numbers
3045 for (j = 1; j < inFields.length; j++) {
3046 fields[j] = this.parseFloat_(inFields[j], i, line);
3049 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
3053 if (fields.length != expectedCols) {
3054 this.error("Number of columns
in line
" + i + " (" + fields.length +
3055 ") does not agree
with number of
labels (" + expectedCols +
3059 // If the user specified the 'labels' option and none of the cells of the
3060 // first row parsed correctly, then they probably double-specified the
3061 // labels. We go with the values set in the option, discard this row and
3062 // log a warning to the JS console.
3063 if (i === 0 && this.attr_('labels')) {
3064 var all_null = true;
3065 for (j = 0; all_null && j < fields.length; j++) {
3066 if (fields[j]) all_null = false;
3069 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3070 "CSV
data ('" + line + "') appears to also contain labels
. " +
3071 "Will drop the CSV labels and
use the option labels
.");
3079 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3080 ret.sort(function(a,b) { return a[0] - b[0]; });
3088 * The user has provided their data as a pre-packaged JS array. If the x values
3089 * are numeric, this is the same as dygraphs' internal format. If the x values
3090 * are dates, we need to convert them from Date objects to ms since epoch.
3091 * @param {[Object]} data
3092 * @return {[Object]} data with numeric x values.
3094 Dygraph.prototype.parseArray_ = function(data) {
3095 // Peek at the first x value to see if it's numeric.
3096 if (data.length === 0) {
3097 this.error("Can
't plot empty data set");
3100 if (data[0].length === 0) {
3101 this.error("Data set cannot contain an empty row");
3106 if (this.attr_("labels") === null) {
3107 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3108 "in the options parameter");
3109 this.attrs_.labels = [ "X" ];
3110 for (i = 1; i < data[0].length; i++) {
3111 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3113 this.attributes_.reparseSeries();
3115 var num_labels = this.attr_("labels");
3116 if (num_labels.length != data[0].length) {
3117 this.error("Mismatch between number of labels (" + num_labels +
3118 ") and number of columns in array (" + data[0].length + ")");
3123 if (Dygraph.isDateLike(data[0][0])) {
3124 // Some intelligent defaults for a date x-axis.
3125 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3126 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3127 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3129 // Assume they're all dates
.
3130 var parsedData
= Dygraph
.clone(data
);
3131 for (i
= 0; i
< data
.length
; i
++) {
3132 if (parsedData
[i
].length
=== 0) {
3133 this.error("Row " + (1 + i
) + " of data is empty");
3136 if (parsedData
[i
][0] === null ||
3137 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3138 isNaN(parsedData
[i
][0].getTime())) {
3139 this.error("x value in row " + (1 + i
) + " is not a Date");
3142 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3146 // Some intelligent defaults for a numeric x-axis.
3147 /** @private (shut up, jsdoc!) */
3148 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3149 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3150 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3156 * Parses a DataTable object from gviz.
3157 * The data is expected to have a first column that is either a date or a
3158 * number. All subsequent columns must be numbers. If there is a clear mismatch
3159 * between this.xValueParser_ and the type of the first column, it will be
3160 * fixed. Fills out rawData_.
3161 * @param {[Object]} data See above.
3164 Dygraph
.prototype.parseDataTable_
= function(data
) {
3165 var shortTextForAnnotationNum
= function(num
) {
3166 // converts [0-9]+ [A-Z][a-z]*
3167 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3168 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3169 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3170 num
= Math
.floor(num
/ 26);
3172 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3173 num
= Math
.floor((num
- 1) / 26);
3178 var cols
= data
.getNumberOfColumns();
3179 var rows
= data
.getNumberOfRows();
3181 var indepType
= data
.getColumnType(0);
3182 if (indepType
== 'date' || indepType
== 'datetime') {
3183 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3184 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3185 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3186 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3187 } else if (indepType
== 'number') {
3188 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3189 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3190 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3191 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3193 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3194 "column 1 of DataTable input (Got '" + indepType
+ "')");
3198 // Array of the column indices which contain data (and not annotations).
3200 var annotationCols
= {}; // data index -> [annotation cols]
3201 var hasAnnotations
= false;
3203 for (i
= 1; i
< cols
; i
++) {
3204 var type
= data
.getColumnType(i
);
3205 if (type
== 'number') {
3207 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3208 // This is OK -- it's an annotation column.
3209 var dataIdx
= colIdx
[colIdx
.length
- 1];
3210 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3211 annotationCols
[dataIdx
] = [i
];
3213 annotationCols
[dataIdx
].push(i
);
3215 hasAnnotations
= true;
3217 this.error("Only 'number' is supported as a dependent type with Gviz." +
3218 " 'string' is only supported if displayAnnotations is true");
3222 // Read column labels
3223 // TODO(danvk): add support back for errorBars
3224 var labels
= [data
.getColumnLabel(0)];
3225 for (i
= 0; i
< colIdx
.length
; i
++) {
3226 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3227 if (this.attr_("errorBars")) i
+= 1;
3229 this.attrs_
.labels
= labels
;
3230 cols
= labels
.length
;
3233 var outOfOrder
= false;
3234 var annotations
= [];
3235 for (i
= 0; i
< rows
; i
++) {
3237 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3238 data
.getValue(i
, 0) === null) {
3239 this.warn("Ignoring row " + i
+
3240 " of DataTable because of undefined or null first column.");
3244 if (indepType
== 'date' || indepType
== 'datetime') {
3245 row
.push(data
.getValue(i
, 0).getTime());
3247 row
.push(data
.getValue(i
, 0));
3249 if (!this.attr_("errorBars")) {
3250 for (j
= 0; j
< colIdx
.length
; j
++) {
3251 var col
= colIdx
[j
];
3252 row
.push(data
.getValue(i
, col
));
3253 if (hasAnnotations
&&
3254 annotationCols
.hasOwnProperty(col
) &&
3255 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3257 ann
.series
= data
.getColumnLabel(col
);
3259 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3261 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3262 if (k
) ann
.text
+= "\n";
3263 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3265 annotations
.push(ann
);
3269 // Strip out infinities, which give dygraphs problems later on.
3270 for (j
= 0; j
< row
.length
; j
++) {
3271 if (!isFinite(row
[j
])) row
[j
] = null;
3274 for (j
= 0; j
< cols
- 1; j
++) {
3275 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3278 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3285 this.warn("DataTable is out of order; order it correctly to speed loading.");
3286 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3288 this.rawData_
= ret
;
3290 if (annotations
.length
> 0) {
3291 this.setAnnotations(annotations
, true);
3296 * Get the CSV data. If it's in a function, call that function. If it's in a
3297 * file, do an XMLHttpRequest to get it.
3300 Dygraph
.prototype.start_
= function() {
3301 var data
= this.file_
;
3303 // Functions can return references of all other types.
3304 if (typeof data
== 'function') {
3308 if (Dygraph
.isArrayLike(data
)) {
3309 this.rawData_
= this.parseArray_(data
);
3311 } else if (typeof data
== 'object' &&
3312 typeof data
.getColumnRange
== 'function') {
3313 // must be a DataTable from gviz.
3314 this.parseDataTable_(data
);
3316 } else if (typeof data
== 'string') {
3317 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3318 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3319 if (line_delimiter
) {
3320 this.loadedEvent_(data
);
3322 var req
= new XMLHttpRequest();
3324 req
.onreadystatechange
= function () {
3325 if (req
.readyState
== 4) {
3326 if (req
.status
=== 200 || // Normal http
3327 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3328 caller
.loadedEvent_(req
.responseText
);
3333 req
.open("GET", data
, true);
3337 this.error("Unknown data format: " + (typeof data
));
3342 * Changes various properties of the graph. These can include:
3344 * <li>file: changes the source data for the graph</li>
3345 * <li>errorBars: changes whether the data contains stddev</li>
3348 * There's a huge variety of options that can be passed to this method. For a
3349 * full list, see http://dygraphs.com/options.html.
3351 * @param {Object} attrs The new properties and values
3352 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3353 * call to updateOptions(). If you know better, you can pass true to explicitly
3354 * block the redraw. This can be useful for chaining updateOptions() calls,
3355 * avoiding the occasional infinite loop and preventing redraws when it's not
3356 * necessary (e.g. when updating a callback).
3358 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3359 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3361 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3362 var file
= input_attrs
.file
;
3363 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3365 // TODO(danvk): this is a mess. Move these options into attr_.
3366 if ('rollPeriod' in attrs
) {
3367 this.rollPeriod_
= attrs
.rollPeriod
;
3369 if ('dateWindow' in attrs
) {
3370 this.dateWindow_
= attrs
.dateWindow
;
3371 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3372 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3375 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3376 this.zoomed_y_
= (attrs
.valueRange
!== null);
3379 // TODO(danvk): validate per-series options.
3384 // highlightCircleSize
3386 // Check if this set options will require new points.
3387 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3389 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3393 if (!block_redraw
) this.start_();
3395 if (!block_redraw
) {
3396 if (requiresNewPoints
) {
3399 this.renderGraph_(false);
3406 * Returns a copy of the options with deprecated names converted into current
3407 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3408 * interested in that, they should save a copy before calling this.
3411 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3413 for (var k
in attrs
) {
3414 if (k
== 'file') continue;
3415 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3418 var set
= function(axis
, opt
, value
) {
3419 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3420 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3421 my_attrs
.axes
[axis
][opt
] = value
;
3423 var map
= function(opt
, axis
, new_opt
) {
3424 if (typeof(attrs
[opt
]) != 'undefined') {
3425 set(axis
, new_opt
, attrs
[opt
]);
3426 delete my_attrs
[opt
];
3430 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3431 map('xValueFormatter', 'x', 'valueFormatter');
3432 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3433 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3434 map('xTicker', 'x', 'ticker');
3435 map('yValueFormatter', 'y', 'valueFormatter');
3436 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3437 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3438 map('yTicker', 'y', 'ticker');
3443 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3444 * containing div (which has presumably changed size since the dygraph was
3445 * instantiated. If the width/height are specified, the div will be resized.
3447 * This is far more efficient than destroying and re-instantiating a
3448 * Dygraph, since it doesn't have to reparse the underlying data.
3450 * @param {Number} [width] Width (in pixels)
3451 * @param {Number} [height] Height (in pixels)
3453 Dygraph
.prototype.resize
= function(width
, height
) {
3454 if (this.resize_lock
) {
3457 this.resize_lock
= true;
3459 if ((width
=== null) != (height
=== null)) {
3460 this.warn("Dygraph.resize() should be called with zero parameters or " +
3461 "two non-NULL parameters. Pretending it was zero.");
3462 width
= height
= null;
3465 var old_width
= this.width_
;
3466 var old_height
= this.height_
;
3469 this.maindiv_
.style
.width
= width
+ "px";
3470 this.maindiv_
.style
.height
= height
+ "px";
3471 this.width_
= width
;
3472 this.height_
= height
;
3474 this.width_
= this.maindiv_
.clientWidth
;
3475 this.height_
= this.maindiv_
.clientHeight
;
3478 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3479 // TODO(danvk): there should be a clear() method.
3480 this.maindiv_
.innerHTML
= "";
3481 this.roller_
= null;
3482 this.attrs_
.labelsDiv
= null;
3483 this.createInterface_();
3484 if (this.annotations_
.length
) {
3485 // createInterface_ reset the layout, so we need to do this.
3486 this.layout_
.setAnnotations(this.annotations_
);
3491 this.resize_lock
= false;
3495 * Adjusts the number of points in the rolling average. Updates the graph to
3496 * reflect the new averaging period.
3497 * @param {Number} length Number of points over which to average the data.
3499 Dygraph
.prototype.adjustRoll
= function(length
) {
3500 this.rollPeriod_
= length
;
3505 * Returns a boolean array of visibility statuses.
3507 Dygraph
.prototype.visibility
= function() {
3508 // Do lazy-initialization, so that this happens after we know the number of
3510 if (!this.attr_("visibility")) {
3511 this.attrs_
.visibility
= [];
3513 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3514 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3515 this.attrs_
.visibility
.push(true);
3517 return this.attr_("visibility");
3521 * Changes the visiblity of a series.
3523 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3524 var x
= this.visibility();
3525 if (num
< 0 || num
>= x
.length
) {
3526 this.warn("invalid series number in setVisibility: " + num
);
3534 * How large of an area will the dygraph render itself in?
3535 * This is used for testing.
3536 * @return A {width: w, height: h} object.
3539 Dygraph
.prototype.size
= function() {
3540 return { width
: this.width_
, height
: this.height_
};
3544 * Update the list of annotations and redraw the chart.
3545 * See dygraphs.com/annotations.html for more info on how to use annotations.
3546 * @param ann {Array} An array of annotation objects.
3547 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3549 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3550 // Only add the annotation CSS rule once we know it will be used.
3551 Dygraph
.addAnnotationRule();
3552 this.annotations_
= ann
;
3553 this.layout_
.setAnnotations(this.annotations_
);
3554 if (!suppressDraw
) {
3560 * Return the list of annotations.
3562 Dygraph
.prototype.annotations
= function() {
3563 return this.annotations_
;
3567 * Get the list of label names for this graph. The first column is the
3568 * x-axis, so the data series names start at index 1.
3570 Dygraph
.prototype.getLabels
= function() {
3571 return this.attr_("labels").slice();
3575 * Get the index of a series (column) given its name. The first column is the
3576 * x-axis, so the data series start with index 1.
3578 Dygraph
.prototype.indexFromSetName
= function(name
) {
3579 return this.setIndexByName_
[name
];
3583 * Get the internal dataset index given its name. These are numbered starting from 0,
3584 * and only count visible sets.
3587 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3588 return this.datasetIndex_
[this.indexFromSetName(name
)];
3593 * Adds a default style for the annotation CSS classes to the document. This is
3594 * only executed when annotations are actually used. It is designed to only be
3595 * called once -- all calls after the first will return immediately.
3597 Dygraph
.addAnnotationRule
= function() {
3598 // TODO(danvk): move this function into plugins/annotations.js
?
3599 if (Dygraph
.addedAnnotationCSS
) return;
3601 var rule
= "border: 1px solid black; " +
3602 "background-color: white; " +
3603 "text-align: center;";
3605 var styleSheetElement
= document
.createElement("style");
3606 styleSheetElement
.type
= "text/css";
3607 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3609 // Find the first style sheet that we can access.
3610 // We may not add a rule to a style sheet from another domain for security
3611 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3612 // adds its own style sheets from google.com.
3613 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3614 if (document
.styleSheets
[i
].disabled
) continue;
3615 var mysheet
= document
.styleSheets
[i
];
3617 if (mysheet
.insertRule
) { // Firefox
3618 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3619 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3620 } else if (mysheet
.addRule
) { // IE
3621 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3623 Dygraph
.addedAnnotationCSS
= true;
3626 // Was likely a security exception.
3630 this.warn("Unable to add default annotation CSS rule; display may be off.");
3633 // Older pages may still use this name.
3634 var DateGraph
= Dygraph
;