3 * Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
8 * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
9 * string. Dygraph can handle multiple series with or without error bars. The
10 * date/value ranges will be automatically set. Dygraph uses the
11 * <canvas> tag, so it only works in FF1.5+.
12 * @author danvdk@gmail.com (Dan Vanderkam)
15 <div id="graphdiv" style="width:800px; height:500px;"></div>
16 <script type="text/javascript">
17 new Dygraph(document.getElementById("graphdiv"),
18 "datafile.csv", // CSV file with headers
22 The CSV file is of the form
24 Date,SeriesA,SeriesB,SeriesC
28 If the 'errorBars' option is set in the constructor, the input should be of
30 Date,SeriesA,SeriesB,...
31 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
32 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
34 If the 'fractions' option is set, the input should be of the form:
36 Date,SeriesA,SeriesB,...
37 YYYYMMDD,A1/B1,A2/B2,...
38 YYYYMMDD,A1/B1,A2/B2,...
40 And error bars will be calculated automatically using a binomial distribution.
42 For further documentation and examples, see http://dygraphs.com/
46 /*jshint globalstrict: true */
47 /*global DygraphLayout:false, DygraphCanvasRenderer:false, DygraphOptions:false, G_vmlCanvasManager:false */
51 * Creates an interactive, zoomable chart.
54 * @param {div | String} div A div or the id of a div into which to construct
56 * @param {String | Function} file A file containing CSV data or a function
57 * that returns this data. The most basic expected format for each line is
58 * "YYYY/MM/DD,val1,val2,...". For more information, see
59 * http://dygraphs.com/data.html.
60 * @param {Object} attrs Various other attributes, e.g. errorBars determines
61 * whether the input data contains error ranges. For a complete list of
62 * options, see http://dygraphs.com/options.html.
64 var Dygraph
= function(div
, data
, opts
, opt_fourth_param
) {
65 if (opt_fourth_param
!== undefined
) {
66 // Old versions of dygraphs took in the series labels as a constructor
67 // parameter. This doesn't make sense anymore, but it's easy to continue
68 // to support this usage.
69 this.warn("Using deprecated four-argument dygraph constructor");
70 this.__old_init__(div
, data
, opts
, opt_fourth_param
);
72 this.__init__(div
, data
, opts
);
76 Dygraph
.NAME
= "Dygraph";
77 Dygraph
.VERSION
= "1.2";
78 Dygraph
.__repr__
= function() {
79 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
83 * Returns information about the Dygraph class.
85 Dygraph
.toString
= function() {
86 return this.__repr__();
89 // Various default values
90 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
91 Dygraph
.DEFAULT_WIDTH
= 480;
92 Dygraph
.DEFAULT_HEIGHT
= 320;
94 // For max 60 Hz. animation:
95 Dygraph
.ANIMATION_STEPS
= 12;
96 Dygraph
.ANIMATION_DURATION
= 200;
98 // These are defined before DEFAULT_ATTRS so that it can refer to them.
101 * Return a string version of a number. This respects the digitsAfterDecimal
102 * and maxNumberWidth options.
103 * @param {Number} x The number to be formatted
104 * @param {Dygraph} opts An options view
105 * @param {String} name The name of the point's data series
106 * @param {Dygraph} g The dygraph object
108 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
109 var sigFigs
= opts('sigFigs');
111 if (sigFigs
!== null) {
112 // User has opted for a fixed number of significant figures.
113 return Dygraph
.floatFormat(x
, sigFigs
);
116 var digits
= opts('digitsAfterDecimal');
117 var maxNumberWidth
= opts('maxNumberWidth');
119 // switch to scientific notation if we underflow or overflow fixed display.
121 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
122 Math
.abs(x
) < Math
.pow(10, -digits
))) {
123 return x
.toExponential(digits
);
125 return '' + Dygraph
.round_(x
, digits
);
130 * variant for use as an axisLabelFormatter.
133 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
134 return Dygraph
.numberValueFormatter(x
, opts
, g
);
138 * Convert a JS date (millis since epoch) to YYYY/MM/DD
139 * @param {Number} date The JavaScript date (ms since epoch)
140 * @return {String} A date of the form "YYYY/MM/DD"
143 Dygraph
.dateString_
= function(date
) {
144 var zeropad
= Dygraph
.zeropad
;
145 var d
= new Date(date
);
148 var year
= "" + d
.getFullYear();
149 // Get a 0 padded month string
150 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
151 // Get a 0 padded day string
152 var day
= zeropad(d
.getDate());
155 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
156 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
158 return year
+ "/" + month + "/" + day
+ ret
;
162 * Convert a JS date to a string appropriate to display on an axis that
163 * is displaying values at the stated granularity.
164 * @param {Date} date The date to format
165 * @param {Number} granularity One of the Dygraph granularity constants
166 * @return {String} The formatted date
169 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
170 if (granularity
>= Dygraph
.DECADAL
) {
171 return date
.strftime('%Y');
172 } else if (granularity
>= Dygraph
.MONTHLY
) {
173 return date
.strftime('%b %y');
175 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
176 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
177 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
179 return Dygraph
.hmsString_(date
.getTime());
185 * Standard plotters. These may be used by clients.
186 * Available plotters are:
187 * - Dygraph.Plotters.linePlotter: draws central lines (most common)
188 * - Dygraph.Plotters.errorPlotter: draws error bars
189 * - Dygraph.Plotters.fillPlotter: draws fills under lines (used with fillGraph)
191 * By default, the plotter is [fillPlotter, errorPlotter, linePlotter].
192 * This causes all the lines to be drawn over all the fills/error bars.
194 Dygraph
.Plotters
= DygraphCanvasRenderer
._Plotters
;
197 // Default attribute values.
198 Dygraph
.DEFAULT_ATTRS
= {
199 highlightCircleSize
: 3,
200 highlightSeriesOpts
: null,
201 highlightSeriesBackgroundAlpha
: 0.5,
205 // TODO(danvk): move defaults from createStatusMessage_ here.
207 labelsSeparateLines
: false,
208 labelsShowZeroValues
: true,
211 showLabelsOnHighlight
: true,
213 digitsAfterDecimal
: 2,
218 strokeBorderWidth
: 0,
219 strokeBorderColor
: "white",
222 axisLabelFontSize
: 14,
228 xValueParser
: Dygraph
.dateParser
,
235 wilsonInterval
: true, // only relevant if fractions is true
239 connectSeparatedPoints
: false,
242 hideOverlayOnMouseOut
: true,
244 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
245 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
249 drawAxesAtZero
: false,
251 // Sizes of the various chart labels.
258 axisLineColor
: "black",
261 axisLabelColor
: "black",
262 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
266 gridLineColor
: "rgb(128,128,128)",
268 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
269 animatedZooms
: false, // (for now)
271 // Range selector options
272 showRangeSelector
: false,
273 rangeSelectorHeight
: 40,
274 rangeSelectorPlotStrokeColor
: "#808FAB",
275 rangeSelectorPlotFillColor
: "#A7B1C4",
277 // The ordering here ensures that central lines always appear above any
278 // fill bars/error bars
.
280 Dygraph
.Plotters
.fillPlotter
,
281 Dygraph
.Plotters
.errorPlotter
,
282 Dygraph
.Plotters
.linePlotter
291 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
292 valueFormatter
: Dygraph
.dateString_
,
293 ticker
: null // will be set in dygraph-tickers.js
297 valueFormatter
: Dygraph
.numberValueFormatter
,
298 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
299 ticker
: null // will be set in dygraph-tickers.js
303 valueFormatter
: Dygraph
.numberValueFormatter
,
304 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
305 ticker
: null // will be set in dygraph-tickers.js
310 // Directions for panning and zooming. Use bit operations when combined
311 // values are possible.
312 Dygraph
.HORIZONTAL
= 1;
313 Dygraph
.VERTICAL
= 2;
315 // Installed plugins, in order of precedence (most-general to most-specific).
316 // Plugins are installed after they are defined, in plugins/install.js
.
320 // Used for initializing annotation CSS rules only once.
321 Dygraph
.addedAnnotationCSS
= false;
323 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
324 // Labels is no longer a constructor parameter, since it's typically set
325 // directly from the data source. It also conains a name for the x-axis,
326 // which the previous constructor form did not.
327 if (labels
!== null) {
328 var new_labels
= ["Date"];
329 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
330 Dygraph
.update(attrs
, { 'labels': new_labels
});
332 this.__init__(div
, file
, attrs
);
336 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
337 * and context <canvas> inside of it. See the constructor for details.
339 * @param {Element} div the Element to render the graph into.
340 * @param {String | Function} file Source data
341 * @param {Object} attrs Miscellaneous other options
344 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
345 // Hack for IE: if we're using excanvas and the document hasn't finished
346 // loading yet (and hence may not have initialized whatever it needs to
347 // initialize), then keep calling this routine periodically until it has.
348 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
349 typeof(G_vmlCanvasManager
) != 'undefined' &&
350 document
.readyState
!= 'complete') {
352 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
356 // Support two-argument constructor
357 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
359 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
361 if (typeof(div
) == 'string') {
362 div
= document
.getElementById(div
);
366 Dygraph
.error("Constructing dygraph with a non-existent div!");
370 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
372 // Copy the important bits into the object
373 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
376 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
377 this.previousVerticalX_
= -1;
378 this.fractions_
= attrs
.fractions
|| false;
379 this.dateWindow_
= attrs
.dateWindow
|| null;
381 this.is_initial_draw_
= true;
382 this.annotations_
= [];
384 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
385 this.zoomed_x_
= false;
386 this.zoomed_y_
= false;
388 // Clear the div. This ensure that, if multiple dygraphs are passed the same
389 // div, then only one will be drawn.
392 // For historical reasons, the 'width' and 'height' options trump all CSS
393 // rules _except_ for an explicit 'width' or 'height' on the div.
394 // As an added convenience, if the div has zero height (like <div></div> does
395 // without any styles), then we use a default height/width
.
396 if (div
.style
.width
=== '' && attrs
.width
) {
397 div
.style
.width
= attrs
.width
+ "px";
399 if (div
.style
.height
=== '' && attrs
.height
) {
400 div
.style
.height
= attrs
.height
+ "px";
402 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
403 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
404 if (div
.style
.width
=== '') {
405 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
408 // these will be zero if the dygraph's div is hidden.
409 this.width_
= div
.clientWidth
;
410 this.height_
= div
.clientHeight
;
412 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
413 if (attrs
.stackedGraph
) {
414 attrs
.fillGraph
= true;
415 // TODO(nikhilk): Add any other stackedGraph checks here.
418 // DEPRECATION WARNING: All option processing should be moved from
419 // attrs_ and user_attrs_ to options_, which holds all this information.
421 // Dygraphs has many options, some of which interact with one another.
422 // To keep track of everything, we maintain two sets of options:
424 // this.user_attrs_ only options explicitly set by the user.
425 // this.attrs_ defaults, options derived from user_attrs_, data.
427 // Options are then accessed this.attr_('attr'), which first looks at
428 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
429 // defaults without overriding behavior that the user specifically asks for.
430 this.user_attrs_
= {};
431 Dygraph
.update(this.user_attrs_
, attrs
);
433 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
435 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
437 this.boundaryIds_
= [];
438 this.setIndexByName_
= {};
439 this.datasetIndex_
= [];
441 this.registeredEvents_
= [];
442 this.eventListeners_
= {};
444 this.attributes_
= new DygraphOptions(this);
446 // Create the containing DIV and other interactive elements
447 this.createInterface_();
451 var plugins
= Dygraph
.PLUGINS
.concat(this.getOption('plugins'));
452 for (var i
= 0; i
< plugins
.length
; i
++) {
453 var Plugin
= plugins
[i
];
454 var pluginInstance
= new Plugin();
456 plugin
: pluginInstance
,
462 var handlers
= pluginInstance
.activate(this);
463 for (var eventName
in handlers
) {
464 // TODO(danvk): validate eventName.
465 pluginDict
.events
[eventName
] = handlers
[eventName
];
468 this.plugins_
.push(pluginDict
);
471 // At this point, plugins can no longer register event handlers.
472 // Construct a map from event -> ordered list of [callback, plugin].
473 for (var i
= 0; i
< this.plugins_
.length
; i
++) {
474 var plugin_dict
= this.plugins_
[i
];
475 for (var eventName
in plugin_dict
.events
) {
476 if (!plugin_dict
.events
.hasOwnProperty(eventName
)) continue;
477 var callback
= plugin_dict
.events
[eventName
];
479 var pair
= [plugin_dict
.plugin
, callback
];
480 if (!(eventName
in this.eventListeners_
)) {
481 this.eventListeners_
[eventName
] = [pair
];
483 this.eventListeners_
[eventName
].push(pair
);
488 this.createDragInterface_();
494 * Triggers a cascade of events to the various plugins which are interested in them.
495 * Returns true if the "default behavior" should be performed, i.e. if none of
496 * the event listeners called event.preventDefault().
499 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
500 if (!(name
in this.eventListeners_
)) return true;
502 // QUESTION: can we use objects & prototypes to speed this up?
506 defaultPrevented
: false,
507 preventDefault
: function() {
508 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
509 e
.defaultPrevented
= true;
511 propagationStopped
: false,
512 stopPropagation
: function() {
513 e
.propagationStopped
= true;
516 Dygraph
.update(e
, extra_props
);
518 var callback_plugin_pairs
= this.eventListeners_
[name
];
519 if (callback_plugin_pairs
) {
520 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
521 var plugin
= callback_plugin_pairs
[i
][0];
522 var callback
= callback_plugin_pairs
[i
][1];
523 callback
.call(plugin
, e
);
524 if (e
.propagationStopped
) break;
527 return e
.defaultPrevented
;
531 * Returns the zoomed status of the chart for one or both axes.
533 * Axis is an optional parameter. Can be set to 'x' or 'y'.
535 * The zoomed status for an axis is set whenever a user zooms using the mouse
536 * or when the dateWindow or valueRange are updated (unless the
537 * isZoomedIgnoreProgrammaticZoom option is also specified).
539 Dygraph
.prototype.isZoomed
= function(axis
) {
540 if (axis
=== null || axis
=== undefined
) {
541 return this.zoomed_x_
|| this.zoomed_y_
;
543 if (axis
=== 'x') return this.zoomed_x_
;
544 if (axis
=== 'y') return this.zoomed_y_
;
545 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
549 * Returns information about the Dygraph object, including its containing ID.
551 Dygraph
.prototype.toString
= function() {
552 var maindiv
= this.maindiv_
;
553 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
554 return "[Dygraph " + id
+ "]";
559 * Returns the value of an option. This may be set by the user (either in the
560 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
562 * @param { String } name The name of the option, e.g. 'rollPeriod'.
563 * @param { String } [seriesName] The name of the series to which the option
564 * will be applied. If no per-series value of this option is available, then
565 * the global value is returned. This is optional.
566 * @return { ... } The value of the option.
568 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
569 // <REMOVE_FOR_COMBINED>
570 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
571 this.error('Must include options reference JS for testing');
572 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
573 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
574 'in the Dygraphs.OPTIONS_REFERENCE listing.');
575 // Only log this error once.
576 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
578 // </REMOVE_FOR_COMBINED
>
579 return seriesName
? this.attributes_
.getForSeries(name
, seriesName
) : this.attributes_
.get(name
);
583 * Returns the current value for an option, as set in the constructor or via
584 * updateOptions. You may pass in an (optional) series name to get per-series
585 * values for the option.
587 * All values returned by this method should be considered immutable. If you
588 * modify them, there is no guarantee that the changes will be honored or that
589 * dygraphs will remain in a consistent state. If you want to modify an option,
590 * use updateOptions() instead.
592 * @param { String } name The name of the option (e.g. 'strokeWidth')
593 * @param { String } [opt_seriesName] Series name to get per-series values.
594 * @return { ... } The value of the option.
596 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
597 return this.attr_(name
, opt_seriesName
);
600 Dygraph
.prototype.getOptionForAxis
= function(name
, axis
) {
601 return this.attributes_
.getForAxis(name
, axis
);
606 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
607 * @return { ... } A function mapping string -> option value
609 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
611 return function(opt
) {
612 var axis_opts
= self
.user_attrs_
.axes
;
613 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
614 return axis_opts
[axis
][opt
];
616 // user-specified attributes always trump defaults, even if they're less
618 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
619 return self
.user_attrs_
[opt
];
622 axis_opts
= self
.attrs_
.axes
;
623 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
624 return axis_opts
[axis
][opt
];
626 // check old-style axis options
627 // TODO(danvk): add a deprecation warning if either of these match.
628 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
629 return self
.axes_
[0][opt
];
630 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
631 return self
.axes_
[1][opt
];
633 return self
.attr_(opt
);
638 * Returns the current rolling period, as set by the user or an option.
639 * @return {Number} The number of points in the rolling window
641 Dygraph
.prototype.rollPeriod
= function() {
642 return this.rollPeriod_
;
646 * Returns the currently-visible x-range. This can be affected by zooming,
647 * panning or a call to updateOptions.
648 * Returns a two-element array: [left, right].
649 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
651 Dygraph
.prototype.xAxisRange
= function() {
652 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
656 * Returns the lower- and upper-bound x-axis values of the
659 Dygraph
.prototype.xAxisExtremes
= function() {
660 var left
= this.rawData_
[0][0];
661 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
662 return [left
, right
];
666 * Returns the currently-visible y-range for an axis. This can be affected by
667 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
668 * called with no arguments, returns the range of the first axis.
669 * Returns a two-element array: [bottom, top].
671 Dygraph
.prototype.yAxisRange
= function(idx
) {
672 if (typeof(idx
) == "undefined") idx
= 0;
673 if (idx
< 0 || idx
>= this.axes_
.length
) {
676 var axis
= this.axes_
[idx
];
677 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
681 * Returns the currently-visible y-ranges for each axis. This can be affected by
682 * zooming, panning, calls to updateOptions, etc.
683 * Returns an array of [bottom, top] pairs, one for each y-axis.
685 Dygraph
.prototype.yAxisRanges
= function() {
687 for (var i
= 0; i
< this.axes_
.length
; i
++) {
688 ret
.push(this.yAxisRange(i
));
693 // TODO(danvk): use these functions throughout dygraphs.
695 * Convert from data coordinates to canvas/div X/Y coordinates.
696 * If specified, do this conversion for the coordinate system of a particular
697 * axis. Uses the first axis by default.
698 * Returns a two-element array: [X, Y]
700 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
701 * instead of toDomCoords(null, y, axis).
703 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
704 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
708 * Convert from data x coordinates to canvas/div X coordinate.
709 * If specified, do this conversion for the coordinate system of a particular
711 * Returns a single value or null if x is null.
713 Dygraph
.prototype.toDomXCoord
= function(x
) {
718 var area
= this.plotter_
.area
;
719 var xRange
= this.xAxisRange();
720 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
724 * Convert from data x coordinates to canvas/div Y coordinate and optional
725 * axis. Uses the first axis by default.
727 * returns a single value or null if y is null.
729 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
730 var pct
= this.toPercentYCoord(y
, axis
);
735 var area
= this.plotter_
.area
;
736 return area
.y
+ pct
* area
.h
;
740 * Convert from canvas/div coords to data coordinates.
741 * If specified, do this conversion for the coordinate system of a particular
742 * axis. Uses the first axis by default.
743 * Returns a two-element array: [X, Y].
745 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
746 * instead of toDataCoords(null, y, axis).
748 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
749 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
753 * Convert from canvas/div x coordinate to data coordinate.
755 * If x is null, this returns null.
757 Dygraph
.prototype.toDataXCoord
= function(x
) {
762 var area
= this.plotter_
.area
;
763 var xRange
= this.xAxisRange();
764 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
768 * Convert from canvas/div y coord to value.
770 * If y is null, this returns null.
771 * if axis is null, this uses the first axis.
773 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
778 var area
= this.plotter_
.area
;
779 var yRange
= this.yAxisRange(axis
);
781 if (typeof(axis
) == "undefined") axis
= 0;
782 if (!this.axes_
[axis
].logscale
) {
783 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
785 // Computing the inverse of toDomCoord.
786 var pct
= (y
- area
.y
) / area
.h
;
788 // Computing the inverse of toPercentYCoord. The function was arrived at with
789 // the following steps:
791 // Original calcuation:
792 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
794 // Move denominator to both sides:
795 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
797 // subtract logr1, and take the negative value.
798 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
800 // Swap both sides of the equation, and we can compute the log of the
801 // return value. Which means we just need to use that as the exponent in
803 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
805 var logr1
= Dygraph
.log10(yRange
[1]);
806 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
807 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
813 * Converts a y for an axis to a percentage from the top to the
814 * bottom of the drawing area.
816 * If the coordinate represents a value visible on the canvas, then
817 * the value will be between 0 and 1, where 0 is the top of the canvas.
818 * However, this method will return values outside the range, as
819 * values can fall outside the canvas.
821 * If y is null, this returns null.
822 * if axis is null, this uses the first axis.
824 * @param { Number } y The data y-coordinate.
825 * @param { Number } [axis] The axis number on which the data coordinate lives.
826 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
828 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
832 if (typeof(axis
) == "undefined") axis
= 0;
834 var yRange
= this.yAxisRange(axis
);
837 var logscale
= this.attributes_
.getForAxis("logscale", axis
);
839 // yRange[1] - y is unit distance from the bottom.
840 // yRange[1] - yRange[0] is the scale of the range.
841 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
842 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
844 var logr1
= Dygraph
.log10(yRange
[1]);
845 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
851 * Converts an x value to a percentage from the left to the right of
854 * If the coordinate represents a value visible on the canvas, then
855 * the value will be between 0 and 1, where 0 is the left of the canvas.
856 * However, this method will return values outside the range, as
857 * values can fall outside the canvas.
859 * If x is null, this returns null.
860 * @param { Number } x The data x-coordinate.
861 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
863 Dygraph
.prototype.toPercentXCoord
= function(x
) {
868 var xRange
= this.xAxisRange();
869 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
873 * Returns the number of columns (including the independent variable).
874 * @return { Integer } The number of columns.
876 Dygraph
.prototype.numColumns
= function() {
877 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
881 * Returns the number of rows (excluding any header/label row).
882 * @return { Integer } The number of rows, less any header.
884 Dygraph
.prototype.numRows
= function() {
885 return this.rawData_
.length
;
889 * Returns the full range of the x-axis, as determined by the most extreme
890 * values in the data set. Not affected by zooming, visibility, etc.
891 * TODO(danvk): merge w/ xAxisExtremes
892 * @return { Array<Number> } A [low, high] pair
895 Dygraph
.prototype.fullXRange_
= function() {
896 if (this.numRows() > 0) {
897 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
904 * Returns the value in the given row and column. If the row and column exceed
905 * the bounds on the data, returns null. Also returns null if the value is
907 * @param { Number} row The row number of the data (0-based). Row 0 is the
908 * first row of data, not a header row.
909 * @param { Number} col The column number of the data (0-based)
910 * @return { Number } The value in the specified cell or null if the row/col
913 Dygraph
.prototype.getValue
= function(row
, col
) {
914 if (row
< 0 || row
> this.rawData_
.length
) return null;
915 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
917 return this.rawData_
[row
][col
];
921 * Generates interface elements for the Dygraph: a containing div, a div to
922 * display the current point, and a textbox to adjust the rolling average
923 * period. Also creates the Renderer/Layout elements.
926 Dygraph
.prototype.createInterface_
= function() {
927 // Create the all-enclosing graph div
928 var enclosing
= this.maindiv_
;
930 this.graphDiv
= document
.createElement("div");
931 this.graphDiv
.style
.width
= this.width_
+ "px";
932 this.graphDiv
.style
.height
= this.height_
+ "px";
933 // TODO(danvk): any other styles that are useful to set here?
934 this.graphDiv
.style
.textAlign
= 'left'; // This is a CSS "reset"
935 enclosing
.appendChild(this.graphDiv
);
937 // Create the canvas for interactive parts of the chart.
938 this.canvas_
= Dygraph
.createCanvas();
939 this.canvas_
.style
.position
= "absolute";
940 this.canvas_
.width
= this.width_
;
941 this.canvas_
.height
= this.height_
;
942 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
943 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
945 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
947 // ... and for static parts of the chart.
948 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
949 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
951 // The interactive parts of the graph are drawn on top of the chart.
952 this.graphDiv
.appendChild(this.hidden_
);
953 this.graphDiv
.appendChild(this.canvas_
);
954 this.mouseEventElement_
= this.createMouseEventElement_();
956 // Create the grapher
957 this.layout_
= new DygraphLayout(this);
961 this.mouseMoveHandler_
= function(e
) {
962 dygraph
.mouseMove_(e
);
965 this.mouseOutHandler_
= function(e
) {
966 // The mouse has left the chart if:
967 // 1. e.target is inside the chart
968 // 2. e.relatedTarget is outside the chart
969 var target
= e
.target
|| e
.fromElement
;
970 var relatedTarget
= e
.relatedTarget
|| e
.toElement
;
971 if (Dygraph
.isElementContainedBy(target
, dygraph
.graphDiv
) &&
972 !Dygraph
.isElementContainedBy(relatedTarget
, dygraph
.graphDiv
)) {
973 dygraph
.mouseOut_(e
);
977 this.addEvent(window
, 'mouseout', this.mouseOutHandler_
);
978 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler_
);
980 // Don't recreate and register the resize handler on subsequent calls.
981 // This happens when the graph is resized.
982 if (!this.resizeHandler_
) {
983 this.resizeHandler_
= function(e
) {
987 // Update when the window is resized.
988 // TODO(danvk): drop frames depending on complexity of the chart.
989 this.addEvent(window
, 'resize', this.resizeHandler_
);
994 * Detach DOM elements in the dygraph and null out all data references.
995 * Calling this when you're done with a dygraph can dramatically reduce memory
996 * usage. See, e.g., the tests/perf.html example.
998 Dygraph
.prototype.destroy
= function() {
999 var removeRecursive
= function(node
) {
1000 while (node
.hasChildNodes()) {
1001 removeRecursive(node
.firstChild
);
1002 node
.removeChild(node
.firstChild
);
1006 if (this.registeredEvents_
) {
1007 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
1008 var reg
= this.registeredEvents_
[idx
];
1009 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
1013 this.registeredEvents_
= [];
1015 // remove mouse event handlers (This may not be necessary anymore)
1016 Dygraph
.removeEvent(window
, 'mouseout', this.mouseOutHandler_
);
1017 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler_
);
1018 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseup', this.mouseUpHandler_
);
1020 // remove window handlers
1021 Dygraph
.removeEvent(window
,'resize',this.resizeHandler_
);
1022 this.resizeHandler_
= null;
1024 removeRecursive(this.maindiv_
);
1026 var nullOut
= function(obj
) {
1027 for (var n
in obj
) {
1028 if (typeof(obj
[n
]) === 'object') {
1033 // These may not all be necessary, but it can't hurt...
1034 nullOut(this.layout_
);
1035 nullOut(this.plotter_
);
1040 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1041 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1042 * or the zoom rectangles) is done on this.canvas_.
1043 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1044 * @return {Object} The newly-created canvas
1047 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1048 var h
= Dygraph
.createCanvas();
1049 h
.style
.position
= "absolute";
1050 // TODO(danvk): h should be offset from canvas. canvas needs to include
1051 // some extra area to make it easier to zoom in on the far left and far
1052 // right. h needs to be precisely the plot area, so that clipping occurs.
1053 h
.style
.top
= canvas
.style
.top
;
1054 h
.style
.left
= canvas
.style
.left
;
1055 h
.width
= this.width_
;
1056 h
.height
= this.height_
;
1057 h
.style
.width
= this.width_
+ "px"; // for IE
1058 h
.style
.height
= this.height_
+ "px"; // for IE
1063 * Creates an overlay element used to handle mouse events.
1064 * @return {Object} The mouse event element.
1067 Dygraph
.prototype.createMouseEventElement_
= function() {
1068 if (this.isUsingExcanvas_
) {
1069 var elem
= document
.createElement("div");
1070 elem
.style
.position
= 'absolute';
1071 elem
.style
.backgroundColor
= 'white';
1072 elem
.style
.filter
= 'alpha(opacity=0)';
1073 elem
.style
.width
= this.width_
+ "px";
1074 elem
.style
.height
= this.height_
+ "px";
1075 this.graphDiv
.appendChild(elem
);
1078 return this.canvas_
;
1083 * Generate a set of distinct colors for the data series. This is done with a
1084 * color wheel. Saturation/Value are customizable, and the hue is
1085 * equally-spaced around the color wheel. If a custom set of colors is
1086 * specified, that is used instead.
1089 Dygraph
.prototype.setColors_
= function() {
1090 var labels
= this.getLabels();
1091 var num
= labels
.length
- 1;
1093 this.colorsMap_
= {};
1094 var colors
= this.attr_('colors');
1097 var sat
= this.attr_('colorSaturation') || 1.0;
1098 var val
= this.attr_('colorValue') || 0.5;
1099 var half
= Math
.ceil(num
/ 2);
1100 for (i
= 1; i
<= num
; i
++) {
1101 if (!this.visibility()[i
-1]) continue;
1102 // alternate colors for high contrast.
1103 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1104 var hue
= (1.0 * idx
/ (1 + num
));
1105 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1106 this.colors_
.push(colorStr
);
1107 this.colorsMap_
[labels
[i
]] = colorStr
;
1110 for (i
= 0; i
< num
; i
++) {
1111 if (!this.visibility()[i
]) continue;
1112 var colorStr
= colors
[i
% colors
.length
];
1113 this.colors_
.push(colorStr
);
1114 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1120 * Return the list of colors. This is either the list of colors passed in the
1121 * attributes or the autogenerated list of rgb(r,g,b) strings.
1122 * This does not return colors for invisible series.
1123 * @return {Array<string>} The list of colors.
1125 Dygraph
.prototype.getColors
= function() {
1126 return this.colors_
;
1130 * Returns a few attributes of a series, i.e. its color, its visibility, which
1131 * axis it's assigned to, and its column in the original data.
1132 * Returns null if the series does not exist.
1133 * Otherwise, returns an object with column, visibility, color and axis properties.
1134 * The "axis" property will be set to 1 for y1 and 2 for y2.
1135 * The "column" property can be fed back into getValue(row, column) to get
1136 * values for this series.
1138 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1140 var labels
= this.getLabels();
1141 for (var i
= 1; i
< labels
.length
; i
++) {
1142 if (labels
[i
] == series_name
) {
1147 if (idx
== -1) return null;
1152 visible
: this.visibility()[idx
- 1],
1153 color
: this.colorsMap_
[series_name
],
1154 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1159 * Create the text box to adjust the averaging period
1162 Dygraph
.prototype.createRollInterface_
= function() {
1163 // Create a roller if one doesn't exist already.
1164 if (!this.roller_
) {
1165 this.roller_
= document
.createElement("input");
1166 this.roller_
.type
= "text";
1167 this.roller_
.style
.display
= "none";
1168 this.graphDiv
.appendChild(this.roller_
);
1171 var display
= this.attr_('showRoller') ? 'block' : 'none';
1173 var area
= this.plotter_
.area
;
1174 var textAttr
= { "position": "absolute",
1176 "top": (area
.y
+ area
.h
- 25) + "px",
1177 "left": (area
.x
+ 1) + "px",
1180 this.roller_
.size
= "2";
1181 this.roller_
.value
= this.rollPeriod_
;
1182 for (var name
in textAttr
) {
1183 if (textAttr
.hasOwnProperty(name
)) {
1184 this.roller_
.style
[name
] = textAttr
[name
];
1189 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1194 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1195 * canvas (i.e. DOM Coords).
1197 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1198 return Dygraph
.pageX(e
) - context
.px
;
1203 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1204 * canvas (i.e. DOM Coords).
1206 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1207 return Dygraph
.pageY(e
) - context
.py
;
1211 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1215 Dygraph
.prototype.createDragInterface_
= function() {
1217 // Tracks whether the mouse is down right now
1219 isPanning
: false, // is this drag part of a pan?
1220 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1221 dragStartX
: null, // pixel coordinates
1222 dragStartY
: null, // pixel coordinates
1223 dragEndX
: null, // pixel coordinates
1224 dragEndY
: null, // pixel coordinates
1225 dragDirection
: null,
1226 prevEndX
: null, // pixel coordinates
1227 prevEndY
: null, // pixel coordinates
1228 prevDragDirection
: null,
1229 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1231 // The value on the left side of the graph when a pan operation starts.
1232 initialLeftmostDate
: null,
1234 // The number of units each pixel spans. (This won't be valid for log
1236 xUnitsPerPixel
: null,
1238 // TODO(danvk): update this comment
1239 // The range in second/value units that the viewport encompasses during a
1240 // panning operation.
1243 // Top-left corner of the canvas, in DOM coords
1244 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1248 // Values for use with panEdgeFraction, which limit how far outside the
1249 // graph's data boundaries it can be panned.
1250 boundedDates
: null, // [minDate, maxDate]
1251 boundedValues
: null, // [[minValue, maxValue] ...]
1253 // We cover iframes during mouse interactions. See comments in
1254 // dygraph-utils.js for more info on why this is a good idea.
1255 tarp
: new Dygraph
.IFrameTarp(),
1257 // contextB is the same thing as this context object but renamed.
1258 initializeMouseDown
: function(event
, g
, contextB
) {
1259 // prevents mouse drags from selecting page text.
1260 if (event
.preventDefault
) {
1261 event
.preventDefault(); // Firefox, Chrome, etc.
1263 event
.returnValue
= false; // IE
1264 event
.cancelBubble
= true;
1267 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1268 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1269 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1270 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1271 contextB
.cancelNextDblclick
= false;
1272 contextB
.tarp
.cover();
1276 var interactionModel
= this.attr_("interactionModel");
1278 // Self is the graph.
1281 // Function that binds the graph and context to the handler.
1282 var bindHandler
= function(handler
) {
1283 return function(event
) {
1284 handler(event
, self
, context
);
1288 for (var eventName
in interactionModel
) {
1289 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1290 this.addEvent(this.mouseEventElement_
, eventName
,
1291 bindHandler(interactionModel
[eventName
]));
1294 // unregister the handler on subsequent calls.
1295 // This happens when the graph is resized.
1296 if (this.mouseUpHandler_
) {
1297 Dygraph
.removeEvent(document
, 'mouseup', this.mouseUpHandler_
);
1300 // If the user releases the mouse button during a drag, but not over the
1301 // canvas, then it doesn't count as a zooming action.
1302 this.mouseUpHandler_
= function(event
) {
1303 if (context
.isZooming
|| context
.isPanning
) {
1304 context
.isZooming
= false;
1305 context
.dragStartX
= null;
1306 context
.dragStartY
= null;
1309 if (context
.isPanning
) {
1310 context
.isPanning
= false;
1311 context
.draggingDate
= null;
1312 context
.dateRange
= null;
1313 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1314 delete self
.axes_
[i
].draggingValue
;
1315 delete self
.axes_
[i
].dragValueRange
;
1319 context
.tarp
.uncover();
1322 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1326 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1327 * up any previous zoom rectangles that were drawn. This could be optimized to
1328 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1331 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1332 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1333 * @param {Number} startX The X position where the drag started, in canvas
1335 * @param {Number} endX The current X position of the drag, in canvas coords.
1336 * @param {Number} startY The Y position where the drag started, in canvas
1338 * @param {Number} endY The current Y position of the drag, in canvas coords.
1339 * @param {Number} prevDirection the value of direction on the previous call to
1340 * this function. Used to avoid excess redrawing
1341 * @param {Number} prevEndX The value of endX on the previous call to this
1342 * function. Used to avoid excess redrawing
1343 * @param {Number} prevEndY The value of endY on the previous call to this
1344 * function. Used to avoid excess redrawing
1347 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1348 endY
, prevDirection
, prevEndX
,
1350 var ctx
= this.canvas_ctx_
;
1352 // Clean up from the previous rect if necessary
1353 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1354 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1355 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1356 } else if (prevDirection
== Dygraph
.VERTICAL
){
1357 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1358 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1361 // Draw a light-grey rectangle to show the new viewing area
1362 if (direction
== Dygraph
.HORIZONTAL
) {
1363 if (endX
&& startX
) {
1364 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1365 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1366 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1368 } else if (direction
== Dygraph
.VERTICAL
) {
1369 if (endY
&& startY
) {
1370 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1371 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1372 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1376 if (this.isUsingExcanvas_
) {
1377 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1382 * Clear the zoom rectangle (and perform no zoom).
1385 Dygraph
.prototype.clearZoomRect_
= function() {
1386 this.currentZoomRectArgs_
= null;
1387 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1391 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1392 * the canvas. The exact zoom window may be slightly larger if there are no data
1393 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1394 * which accepts dates that match the raw data. This function redraws the graph.
1396 * @param {Number} lowX The leftmost pixel value that should be visible.
1397 * @param {Number} highX The rightmost pixel value that should be visible.
1400 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1401 this.currentZoomRectArgs_
= null;
1402 // Find the earliest and latest dates contained in this canvasx range.
1403 // Convert the call to date ranges of the raw data.
1404 var minDate
= this.toDataXCoord(lowX
);
1405 var maxDate
= this.toDataXCoord(highX
);
1406 this.doZoomXDates_(minDate
, maxDate
);
1410 * Transition function to use in animations. Returns values between 0.0
1411 * (totally old values) and 1.0 (totally new values) for each frame.
1414 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1416 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1420 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1421 * method with doZoomX which accepts pixel coordinates. This function redraws
1424 * @param {Number} minDate The minimum date that should be visible.
1425 * @param {Number} maxDate The maximum date that should be visible.
1428 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1429 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1430 // can produce strange effects. Rather than the y-axis transitioning slowly
1431 // between values, it can jerk around.)
1432 var old_window
= this.xAxisRange();
1433 var new_window
= [minDate
, maxDate
];
1434 this.zoomed_x_
= true;
1436 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1437 if (that
.attr_("zoomCallback")) {
1438 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1444 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1445 * the canvas. This function redraws the graph.
1447 * @param {Number} lowY The topmost pixel value that should be visible.
1448 * @param {Number} highY The lowest pixel value that should be visible.
1451 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1452 this.currentZoomRectArgs_
= null;
1453 // Find the highest and lowest values in pixel range for each axis.
1454 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1455 // This is because pixels increase as you go down on the screen, whereas data
1456 // coordinates increase as you go up the screen.
1457 var oldValueRanges
= this.yAxisRanges();
1458 var newValueRanges
= [];
1459 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1460 var hi
= this.toDataYCoord(lowY
, i
);
1461 var low
= this.toDataYCoord(highY
, i
);
1462 newValueRanges
.push([low
, hi
]);
1465 this.zoomed_y_
= true;
1467 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1468 if (that
.attr_("zoomCallback")) {
1469 var xRange
= that
.xAxisRange();
1470 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1476 * Reset the zoom to the original view coordinates. This is the same as
1477 * double-clicking on the graph.
1479 Dygraph
.prototype.resetZoom
= function() {
1480 var dirty
= false, dirtyX
= false, dirtyY
= false;
1481 if (this.dateWindow_
!== null) {
1486 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1487 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1493 // Clear any selection, since it's likely to be drawn in the wrong place.
1494 this.clearSelection();
1497 this.zoomed_x_
= false;
1498 this.zoomed_y_
= false;
1500 var minDate
= this.rawData_
[0][0];
1501 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1503 // With only one frame, don't bother calculating extreme ranges.
1504 // TODO(danvk): merge this block w/ the code below
.
1505 if (!this.attr_("animatedZooms")) {
1506 this.dateWindow_
= null;
1507 for (i
= 0; i
< this.axes_
.length
; i
++) {
1508 if (this.axes_
[i
].valueWindow
!== null) {
1509 delete this.axes_
[i
].valueWindow
;
1513 if (this.attr_("zoomCallback")) {
1514 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1519 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1521 oldWindow
= this.xAxisRange();
1522 newWindow
= [minDate
, maxDate
];
1526 oldValueRanges
= this.yAxisRanges();
1527 // TODO(danvk): this is pretty inefficient
1528 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1529 var extremes
= packed
[1];
1531 // this has the side-effect of modifying this.axes_.
1532 // this doesn't make much sense in this context, but it's convenient (we
1533 // need this.axes_[*].extremeValues) and not harmful since we'll be
1534 // calling drawGraph_ shortly, which clobbers these values.
1535 this.computeYAxisRanges_(extremes
);
1537 newValueRanges
= [];
1538 for (i
= 0; i
< this.axes_
.length
; i
++) {
1539 var axis
= this.axes_
[i
];
1540 newValueRanges
.push((axis
.valueRange
!== null &&
1541 axis
.valueRange
!== undefined
) ?
1542 axis
.valueRange
: axis
.extremeRange
);
1547 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1549 that
.dateWindow_
= null;
1550 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1551 if (that
.axes_
[i
].valueWindow
!== null) {
1552 delete that
.axes_
[i
].valueWindow
;
1555 if (that
.attr_("zoomCallback")) {
1556 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1563 * Combined animation logic for all zoom functions.
1564 * either the x parameters or y parameters may be null.
1567 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1568 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1571 var valueRanges
= [];
1574 if (oldXRange
!== null && newXRange
!== null) {
1575 for (step
= 1; step
<= steps
; step
++) {
1576 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1577 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1578 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1582 if (oldYRanges
!== null && newYRanges
!== null) {
1583 for (step
= 1; step
<= steps
; step
++) {
1584 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1586 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1587 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1588 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1590 valueRanges
[step
-1] = thisRange
;
1595 Dygraph
.repeatAndCleanup(function(step
) {
1596 if (valueRanges
.length
) {
1597 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1598 var w
= valueRanges
[step
][i
];
1599 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1602 if (windows
.length
) {
1603 that
.dateWindow_
= windows
[step
];
1606 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1610 * Get the current graph's area object.
1612 * Returns: {x, y, w, h}
1614 Dygraph
.prototype.getArea
= function() {
1615 return this.plotter_
.area
;
1619 * Convert a mouse event to DOM coordinates relative to the graph origin.
1621 * Returns a two-element array: [X, Y].
1623 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1624 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1625 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1626 return [canvasx
, canvasy
];
1630 * Given a canvas X coordinate, find the closest row.
1631 * @param {Number} domX graph-relative DOM X coordinate
1632 * Returns: row number, integer
1635 Dygraph
.prototype.findClosestRow
= function(domX
) {
1636 var minDistX
= Infinity
;
1637 var pointIdx
= -1, setIdx
= -1;
1638 var sets
= this.layout_
.points
;
1639 for (var i
= 0; i
< sets
.length
; i
++) {
1640 var points
= sets
[i
];
1641 var len
= points
.length
;
1642 for (var j
= 0; j
< len
; j
++) {
1643 var point
= points
[j
];
1644 if (!Dygraph
.isValidPoint(point
, true)) continue;
1645 var dist
= Math
.abs(point
.canvasx
- domX
);
1646 if (dist
< minDistX
) {
1654 // TODO(danvk): remove this function; it's trivial and has only one use.
1655 return this.idxToRow_(setIdx
, pointIdx
);
1659 * Given canvas X,Y coordinates, find the closest point.
1661 * This finds the individual data point across all visible series
1662 * that's closest to the supplied DOM coordinates using the standard
1663 * Euclidean X,Y distance.
1665 * @param {Number} domX graph-relative DOM X coordinate
1666 * @param {Number} domY graph-relative DOM Y coordinate
1667 * Returns: {row, seriesName, point}
1670 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1671 var minDist
= Infinity
;
1673 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1674 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1675 var points
= this.layout_
.points
[setIdx
];
1676 for (var i
= 0; i
< points
.length
; ++i
) {
1677 var point
= points
[i
];
1678 if (!Dygraph
.isValidPoint(point
)) continue;
1679 dx
= point
.canvasx
- domX
;
1680 dy
= point
.canvasy
- domY
;
1681 dist
= dx
* dx
+ dy
* dy
;
1682 if (dist
< minDist
) {
1684 closestPoint
= point
;
1685 closestSeries
= setIdx
;
1690 var name
= this.layout_
.setNames
[closestSeries
];
1692 row
: idx
+ this.getLeftBoundary_(),
1699 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1701 * This first finds the X data point closest to the supplied DOM X coordinate,
1702 * then finds the series which puts the Y coordinate on top of its filled area,
1703 * using linear interpolation between adjacent point pairs.
1705 * @param {Number} domX graph-relative DOM X coordinate
1706 * @param {Number} domY graph-relative DOM Y coordinate
1707 * Returns: {row, seriesName, point}
1710 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1711 var row
= this.findClosestRow(domX
);
1712 var boundary
= this.getLeftBoundary_();
1713 var rowIdx
= row
- boundary
;
1714 var closestPoint
, closestSeries
;
1715 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1716 var points
= this.layout_
.points
[setIdx
];
1717 if (rowIdx
>= points
.length
) continue;
1718 var p1
= points
[rowIdx
];
1719 if (!Dygraph
.isValidPoint(p1
)) continue;
1720 var py
= p1
.canvasy
;
1721 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1722 // interpolate series Y value using next point
1723 var p2
= points
[rowIdx
+ 1];
1724 if (Dygraph
.isValidPoint(p2
)) {
1725 var dx
= p2
.canvasx
- p1
.canvasx
;
1727 var r
= (domX
- p1
.canvasx
) / dx
;
1728 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1731 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1732 // interpolate series Y value using previous point
1733 var p0
= points
[rowIdx
- 1];
1734 if (Dygraph
.isValidPoint(p0
)) {
1735 var dx
= p1
.canvasx
- p0
.canvasx
;
1737 var r
= (p1
.canvasx
- domX
) / dx
;
1738 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1742 // Stop if the point (domX, py) is above this series' upper edge
1743 if (setIdx
=== 0 || py
< domY
) {
1745 closestSeries
= setIdx
;
1748 var name
= this.layout_
.setNames
[closestSeries
];
1757 * When the mouse moves in the canvas, display information about a nearby data
1758 * point and draw dots over those points in the data series. This function
1759 * takes care of cleanup of previously-drawn dots.
1760 * @param {Object} event The mousemove event from the browser.
1763 Dygraph
.prototype.mouseMove_
= function(event
) {
1764 // This prevents JS errors when mousing over the canvas before data loads.
1765 var points
= this.layout_
.points
;
1766 if (points
=== undefined
|| points
=== null) return;
1768 var canvasCoords
= this.eventToDomCoords(event
);
1769 var canvasx
= canvasCoords
[0];
1770 var canvasy
= canvasCoords
[1];
1772 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1773 var selectionChanged
= false;
1774 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1776 if (this.attr_("stackedGraph")) {
1777 closest
= this.findStackedPoint(canvasx
, canvasy
);
1779 closest
= this.findClosestPoint(canvasx
, canvasy
);
1781 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1783 var idx
= this.findClosestRow(canvasx
);
1784 selectionChanged
= this.setSelection(idx
);
1787 var callback
= this.attr_("highlightCallback");
1788 if (callback
&& selectionChanged
) {
1789 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1794 * Fetch left offset from first defined boundaryIds record (see bug #236).
1797 Dygraph
.prototype.getLeftBoundary_
= function() {
1798 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1799 if (this.boundaryIds_
[i
] !== undefined
) {
1800 return this.boundaryIds_
[i
][0];
1807 * Transforms layout_.points index into data row number.
1808 * @param int layout_.points index
1809 * @return int row number, or -1 if none could be found.
1812 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1813 if (rowIdx
< 0) return -1;
1815 var boundary
= this.getLeftBoundary_();
1816 return boundary
+ rowIdx
;
1817 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1818 // var set = this.layout_.datasets[setIdx];
1819 // if (idx < set.length) {
1820 // return boundary + idx;
1822 // idx -= set.length;
1827 Dygraph
.prototype.animateSelection_
= function(direction
) {
1828 var totalSteps
= 10;
1830 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1831 if (this.animateId
=== undefined
) this.animateId
= 0;
1832 var start
= this.fadeLevel
;
1833 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1835 if (this.fadeLevel
) {
1836 this.updateSelection_(1.0);
1841 var thisId
= ++this.animateId
;
1843 Dygraph
.repeatAndCleanup(
1845 // ignore simultaneous animations
1846 if (that
.animateId
!= thisId
) return;
1848 that
.fadeLevel
+= direction
;
1849 if (that
.fadeLevel
=== 0) {
1850 that
.clearSelection();
1852 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1855 steps
, millis
, function() {});
1859 * Draw dots over the selectied points in the data series. This function
1860 * takes care of cleanup of previously-drawn dots.
1863 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1864 /*var defaultPrevented = */
1865 this.cascadeEvents_('select', {
1866 selectedX
: this.lastx_
,
1867 selectedPoints
: this.selPoints_
1869 // TODO(danvk): use defaultPrevented here?
1871 // Clear the previously drawn vertical, if there is one
1873 var ctx
= this.canvas_ctx_
;
1874 if (this.attr_('highlightSeriesOpts')) {
1875 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1876 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1878 // Activating background fade includes an animation effect for a gradual
1879 // fade. TODO(klausw): make this independently configurable if it causes
1880 // issues? Use a shared preference to control animations?
1881 var animateBackgroundFade
= true;
1882 if (animateBackgroundFade
) {
1883 if (opt_animFraction
=== undefined
) {
1884 // start a new animation
1885 this.animateSelection_(1);
1888 alpha
*= opt_animFraction
;
1890 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1891 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1894 // Redraw only the highlighted series in the interactive canvas (not the
1895 // static plot canvas, which is where series are usually drawn).
1896 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1897 } else if (this.previousVerticalX_
>= 0) {
1898 // Determine the maximum highlight circle size.
1899 var maxCircleSize
= 0;
1900 var labels
= this.attr_('labels');
1901 for (i
= 1; i
< labels
.length
; i
++) {
1902 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1903 if (r
> maxCircleSize
) maxCircleSize
= r
;
1905 var px
= this.previousVerticalX_
;
1906 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1907 2 * maxCircleSize
+ 2, this.height_
);
1910 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1911 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1914 if (this.selPoints_
.length
> 0) {
1915 // Draw colored circles over the center of each selected point
1916 var canvasx
= this.selPoints_
[0].canvasx
;
1918 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1919 var pt
= this.selPoints_
[i
];
1920 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1922 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1923 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1924 var color
= this.plotter_
.colors
[pt
.name
];
1926 callback
= Dygraph
.Circles
.DEFAULT
;
1928 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1929 ctx
.strokeStyle
= color
;
1930 ctx
.fillStyle
= color
;
1931 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1936 this.previousVerticalX_
= canvasx
;
1941 * Manually set the selected points and display information about them in the
1942 * legend. The selection can be cleared using clearSelection() and queried
1943 * using getSelection().
1944 * @param { Integer } row number that should be highlighted (i.e. appear with
1945 * hover dots on the chart). Set to false to clear any selection.
1946 * @param { seriesName } optional series name to highlight that series with the
1947 * the highlightSeriesOpts setting.
1948 * @param { locked } optional If true, keep seriesName selected when mousing
1949 * over the graph, disabling closest-series highlighting. Call clearSelection()
1952 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1953 // Extract the points we've selected
1954 this.selPoints_
= [];
1956 if (row
!== false) {
1957 row
-= this.getLeftBoundary_();
1960 var changed
= false;
1961 if (row
!== false && row
>= 0) {
1962 if (row
!= this.lastRow_
) changed
= true;
1963 this.lastRow_
= row
;
1964 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1965 var set
= this.layout_
.datasets
[setIdx
];
1966 if (row
< set
.length
) {
1967 var point
= this.layout_
.points
[setIdx
][row
];
1969 if (this.attr_("stackedGraph")) {
1970 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1973 if (point
.yval
!== null) this.selPoints_
.push(point
);
1977 if (this.lastRow_
>= 0) changed
= true;
1981 if (this.selPoints_
.length
) {
1982 this.lastx_
= this.selPoints_
[0].xval
;
1987 if (opt_seriesName
!== undefined
) {
1988 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1989 this.highlightSet_
= opt_seriesName
;
1992 if (opt_locked
!== undefined
) {
1993 this.lockedSet_
= opt_locked
;
1997 this.updateSelection_(undefined
);
2003 * The mouse has left the canvas. Clear out whatever artifacts remain
2004 * @param {Object} event the mouseout event from the browser.
2007 Dygraph
.prototype.mouseOut_
= function(event
) {
2008 if (this.attr_("unhighlightCallback")) {
2009 this.attr_("unhighlightCallback")(event
);
2012 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
2013 this.clearSelection();
2018 * Clears the current selection (i.e. points that were highlighted by moving
2019 * the mouse over the chart).
2021 Dygraph
.prototype.clearSelection
= function() {
2022 this.cascadeEvents_('deselect', {});
2024 this.lockedSet_
= false;
2025 // Get rid of the overlay data
2026 if (this.fadeLevel
) {
2027 this.animateSelection_(-1);
2030 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2032 this.selPoints_
= [];
2035 this.highlightSet_
= null;
2039 * Returns the number of the currently selected row. To get data for this row,
2040 * you can use the getValue method.
2041 * @return { Integer } row number, or -1 if nothing is selected
2043 Dygraph
.prototype.getSelection
= function() {
2044 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2048 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2049 var points
= this.layout_
.points
[setIdx
];
2050 for (var row
= 0; row
< points
.length
; row
++) {
2051 if (points
[row
].x
== this.selPoints_
[0].x
) {
2052 return row
+ this.getLeftBoundary_();
2060 * Returns the name of the currently-highlighted series.
2061 * Only available when the highlightSeriesOpts option is in use.
2063 Dygraph
.prototype.getHighlightSeries
= function() {
2064 return this.highlightSet_
;
2068 * Returns true if the currently-highlighted series was locked
2069 * via setSelection(..., seriesName, true).
2071 Dygraph
.prototype.isSeriesLocked
= function() {
2072 return this.lockedSet_
;
2076 * Fires when there's data available to be graphed.
2077 * @param {String} data Raw CSV data to be plotted
2080 Dygraph
.prototype.loadedEvent_
= function(data
) {
2081 this.rawData_
= this.parseCSV_(data
);
2086 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2089 Dygraph
.prototype.addXTicks_
= function() {
2090 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2092 if (this.dateWindow_
) {
2093 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2095 range
= this.fullXRange_();
2098 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2099 var xTicks
= xAxisOptionsView('ticker')(
2102 this.width_
, // TODO(danvk): should be area.width
2105 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2106 // console.log(msg);
2107 this.layout_
.setXTicks(xTicks
);
2112 * Computes the range of the data series (including confidence intervals).
2113 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2114 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2115 * @return [low, high]
2117 Dygraph
.prototype.extremeValues_
= function(series
) {
2118 var minY
= null, maxY
= null, j
, y
;
2120 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2122 // With custom bars, maxY is the max of the high values.
2123 for (j
= 0; j
< series
.length
; j
++) {
2124 y
= series
[j
][1][0];
2125 if (y
=== null || isNaN(y
)) continue;
2126 var low
= y
- series
[j
][1][1];
2127 var high
= y
+ series
[j
][1][2];
2128 if (low
> y
) low
= y
; // this can happen with custom bars,
2129 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2130 if (maxY
=== null || high
> maxY
) {
2133 if (minY
=== null || low
< minY
) {
2138 for (j
= 0; j
< series
.length
; j
++) {
2140 if (y
=== null || isNaN(y
)) continue;
2141 if (maxY
=== null || y
> maxY
) {
2144 if (minY
=== null || y
< minY
) {
2150 return [minY
, maxY
];
2155 * This function is called once when the chart's data is changed or the options
2156 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2157 * idea is that values derived from the chart's data can be computed here,
2158 * rather than every time the chart is drawn. This includes things like the
2159 * number of axes, rolling averages, etc.
2161 Dygraph
.prototype.predraw_
= function() {
2162 var start
= new Date();
2164 this.layout_
.computePlotArea();
2166 // TODO(danvk): move more computations out of drawGraph_ and into here.
2167 this.computeYAxes_();
2169 // Create a new plotter.
2170 if (this.plotter_
) {
2171 this.cascadeEvents_('clearChart');
2172 this.plotter_
.clear();
2174 this.plotter_
= new DygraphCanvasRenderer(this,
2179 // The roller sits in the bottom left corner of the chart. We don't know where
2180 // this will be until the options are available, so it's positioned here.
2181 this.createRollInterface_();
2183 this.cascadeEvents_('predraw');
2185 // Convert the raw data (a 2D array) into the internal format and compute
2186 // rolling averages.
2187 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2188 for (var i
= 1; i
< this.numColumns(); i
++) {
2189 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2190 var logScale
= this.attr_('logscale');
2191 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2192 series
= this.rollingAverage(series
, this.rollPeriod_
);
2193 this.rolledSeries_
.push(series
);
2196 // If the data or options have changed, then we'd better redraw.
2199 // This is used to determine whether to do various animations.
2200 var end
= new Date();
2201 this.drawingTimeMs_
= (end
- start
);
2205 * Loop over all fields and create datasets, calculating extreme y-values for
2206 * each series and extreme x-indices as we go.
2208 * dateWindow is passed in as an explicit parameter so that we can compute
2209 * extreme values "speculatively", i.e. without actually setting state on the
2212 * TODO(danvk): make this more of a true function
2213 * @return [ datasets, seriesExtremes, boundaryIds ]
2216 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2217 var boundaryIds
= [];
2218 var cumulative_y
= []; // For stacked series.
2220 var extremes
= {}; // series name -> [low, high]
2223 // Loop over the fields (series). Go from the last to the first,
2224 // because if they're stacked that's how we accumulate the values.
2225 var num_series
= rolledSeries
.length
- 1;
2226 for (i
= num_series
; i
>= 1; i
--) {
2227 if (!this.visibility()[i
- 1]) continue;
2229 // Note: this copy _is_ necessary at the moment.
2230 // If you remove it, it breaks zooming with error bars on.
2231 // TODO(danvk): investigate further & write a test for this.
2233 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2234 series
.push(rolledSeries
[i
][j
]);
2237 // Prune down to the desired range, if necessary (for zooming)
2238 // Because there can be lines going to points outside of the visible area,
2239 // we actually prune to visible points, plus one on either side.
2240 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2242 var low
= dateWindow
[0];
2243 var high
= dateWindow
[1];
2245 // TODO(danvk): do binary search instead of linear search.
2246 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2247 var firstIdx
= null, lastIdx
= null;
2248 for (k
= 0; k
< series
.length
; k
++) {
2249 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2252 if (series
[k
][0] <= high
) {
2256 if (firstIdx
=== null) firstIdx
= 0;
2257 if (firstIdx
> 0) firstIdx
--;
2258 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2259 if (lastIdx
< series
.length
- 1) lastIdx
++;
2260 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2261 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2262 pruned
.push(series
[k
]);
2266 boundaryIds
[i
-1] = [0, series
.length
-1];
2269 var seriesExtremes
= this.extremeValues_(series
);
2272 for (j
=0; j
<series
.length
; j
++) {
2273 series
[j
] = [series
[j
][0],
2278 } else if (this.attr_("stackedGraph")) {
2279 var l
= series
.length
;
2281 for (j
= 0; j
< l
; j
++) {
2282 // If one data set has a NaN, let all subsequent stacked
2283 // sets inherit the NaN -- only start at 0 for the first set.
2284 var x
= series
[j
][0];
2285 if (cumulative_y
[x
] === undefined
) {
2286 cumulative_y
[x
] = 0;
2289 actual_y
= series
[j
][1];
2290 if (actual_y
=== null) {
2291 series
[j
] = [x
, null];
2295 cumulative_y
[x
] += actual_y
;
2297 series
[j
] = [x
, cumulative_y
[x
]];
2299 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2300 seriesExtremes
[1] = cumulative_y
[x
];
2302 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2303 seriesExtremes
[0] = cumulative_y
[x
];
2308 var seriesName
= this.attr_("labels")[i
];
2309 extremes
[seriesName
] = seriesExtremes
;
2310 datasets
[i
] = series
;
2313 // For stacked graphs, a NaN value for any point in the sum should create a
2314 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2315 if (this.attr_("stackedGraph")) {
2316 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2317 // Use the first nonempty dataset to get X values.
2318 if (!datasets
[k
]) continue;
2319 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2320 var x
= datasets
[k
][j
][0];
2321 if (isNaN(cumulative_y
[x
])) {
2322 // Set all Y values to NaN at that X value.
2323 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2324 if (!datasets
[i
]) continue;
2325 datasets
[i
][j
][1] = NaN
;
2333 return [ datasets
, extremes
, boundaryIds
];
2337 * Update the graph with new data. This method is called when the viewing area
2338 * has changed. If the underlying data or options have changed, predraw_ will
2339 * be called before drawGraph_ is called.
2343 Dygraph
.prototype.drawGraph_
= function() {
2344 var start
= new Date();
2346 // This is used to set the second parameter to drawCallback, below.
2347 var is_initial_draw
= this.is_initial_draw_
;
2348 this.is_initial_draw_
= false;
2350 this.layout_
.removeAllDatasets();
2352 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2354 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2355 var datasets
= packed
[0];
2356 var extremes
= packed
[1];
2357 this.boundaryIds_
= packed
[2];
2359 this.setIndexByName_
= {};
2360 var labels
= this.attr_("labels");
2361 if (labels
.length
> 0) {
2362 this.setIndexByName_
[labels
[0]] = 0;
2365 for (var i
= 1; i
< datasets
.length
; i
++) {
2366 this.setIndexByName_
[labels
[i
]] = i
;
2367 if (!this.visibility()[i
- 1]) continue;
2368 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2369 this.datasetIndex_
[i
] = dataIdx
++;
2372 this.computeYAxisRanges_(extremes
);
2373 this.layout_
.setYAxes(this.axes_
);
2377 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2378 var tmp_zoomed_x
= this.zoomed_x_
;
2379 // Tell PlotKit to use this new data and render itself
2380 this.layout_
.setDateWindow(this.dateWindow_
);
2381 this.zoomed_x_
= tmp_zoomed_x
;
2382 this.layout_
.evaluateWithError();
2383 this.renderGraph_(is_initial_draw
);
2385 if (this.attr_("timingName")) {
2386 var end
= new Date();
2387 Dygraph
.info(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2392 * This does the work of drawing the chart. It assumes that the layout and axis
2393 * scales have already been set (e.g. by predraw_).
2397 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2398 this.cascadeEvents_('clearChart');
2399 this.plotter_
.clear();
2401 if (this.attr_('underlayCallback')) {
2402 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2403 // users who expect a deprecated form of this callback.
2404 this.attr_('underlayCallback')(
2405 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2409 canvas
: this.hidden_
,
2410 drawingContext
: this.hidden_ctx_
2412 this.cascadeEvents_('willDrawChart', e
);
2413 this.plotter_
.render();
2414 this.cascadeEvents_('didDrawChart', e
);
2416 // TODO(danvk): is this a performance bottleneck when panning?
2417 // The interaction canvas should already be empty in that situation.
2418 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2419 this.canvas_
.height
);
2421 if (this.attr_("drawCallback") !== null) {
2422 this.attr_("drawCallback")(this, is_initial_draw
);
2428 * Determine properties of the y-axes which are independent of the data
2429 * currently being displayed. This includes things like the number of axes and
2430 * the style of the axes. It does not include the range of each axis and its
2432 * This fills in this.axes_.
2433 * axes_ = [ { options } ]
2434 * indices are into the axes_ array.
2436 Dygraph
.prototype.computeYAxes_
= function() {
2437 // Preserve valueWindow settings if they exist, and if the user hasn't
2438 // specified a new valueRange.
2439 var valueWindows
, axis
, index
, opts
, v
;
2440 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2442 for (index
= 0; index
< this.axes_
.length
; index
++) {
2443 valueWindows
.push(this.axes_
[index
].valueWindow
);
2447 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2448 // data computation as well as options storage.
2449 // Go through once and add all the axes.
2452 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2453 // Add a new axis, making a copy of its per-axis options.
2454 opts
= { g
: this };
2455 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2456 this.axes_
[axis
] = opts
;
2460 // Copy global valueRange option over to the first axis.
2461 // NOTE(konigsberg): Are these two statements necessary?
2462 // I tried removing it. The automated tests pass, and manually
2463 // messing with tests/zoom
.html showed no trouble
.
2464 v
= this.attr_('valueRange');
2465 if (v
) this.axes_
[0].valueRange
= v
;
2467 if (valueWindows
!== undefined
) {
2468 // Restore valueWindow settings.
2469 for (index
= 0; index
< valueWindows
.length
; index
++) {
2470 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2474 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2476 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2477 v
= opts("valueRange");
2478 if (v
) this.axes_
[axis
].valueRange
= v
;
2479 } else { // To keep old behavior
2480 var axes
= this.user_attrs_
.axes
;
2481 if (axes
&& axes
.y2
) {
2482 v
= axes
.y2
.valueRange
;
2483 if (v
) this.axes_
[axis
].valueRange
= v
;
2490 * Returns the number of y-axes on the chart.
2491 * @return {Number} the number of axes.
2493 Dygraph
.prototype.numAxes
= function() {
2494 return this.attributes_
.numAxes();
2499 * Returns axis properties for the given series.
2500 * @param { String } setName The name of the series for which to get axis
2501 * properties, e.g. 'Y1'.
2502 * @return { Object } The axis properties.
2504 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2505 // TODO(danvk): handle errors.
2506 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2511 * Determine the value range and tick marks for each axis.
2512 * @param {Object} extremes A mapping from seriesName -> [low, high]
2513 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2515 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2517 var isNullUndefinedOrNaN
= function(num
) {
2518 return isNaN(parseFloat(num
));
2521 var numAxes
= this.attributes_
.numAxes();
2523 // Compute extreme values, a span and tick marks for each axis.
2524 for (var i
= 0; i
< numAxes
; i
++) {
2525 var axis
= this.axes_
[i
];
2526 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2527 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2528 series
= this.attributes_
.seriesForAxis(i
);
2530 if (series
.length
=== 0) {
2531 // If no series are defined or visible then use a reasonable default
2532 axis
.extremeRange
= [0, 1];
2534 // Calculate the extremes of extremes.
2535 var minY
= Infinity
; // extremes[series[0]][0];
2536 var maxY
= -Infinity
; // extremes[series[0]][1];
2537 var extremeMinY
, extremeMaxY
;
2539 for (var j
= 0; j
< series
.length
; j
++) {
2540 // this skips invisible series
2541 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2543 // Only use valid extremes to stop null data series' from corrupting the scale.
2544 extremeMinY
= extremes
[series
[j
]][0];
2545 if (extremeMinY
!== null) {
2546 minY
= Math
.min(extremeMinY
, minY
);
2548 extremeMaxY
= extremes
[series
[j
]][1];
2549 if (extremeMaxY
!== null) {
2550 maxY
= Math
.max(extremeMaxY
, maxY
);
2553 if (includeZero
&& minY
> 0) minY
= 0;
2555 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2556 if (minY
== Infinity
) minY
= 0;
2557 if (maxY
== -Infinity
) maxY
= 1;
2559 // Add some padding and round up to an integer to be human-friendly.
2560 var span
= maxY
- minY
;
2561 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2562 if (span
=== 0) { span
= maxY
; }
2564 var maxAxisY
, minAxisY
;
2566 maxAxisY
= maxY
+ 0.1 * span
;
2569 maxAxisY
= maxY
+ 0.1 * span
;
2570 minAxisY
= minY
- 0.1 * span
;
2572 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2573 if (!this.attr_("avoidMinZero")) {
2574 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2575 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2578 if (this.attr_("includeZero")) {
2579 if (maxY
< 0) maxAxisY
= 0;
2580 if (minY
> 0) minAxisY
= 0;
2583 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2585 if (axis
.valueWindow
) {
2586 // This is only set if the user has zoomed on the y-axis. It is never set
2587 // by a user. It takes precedence over axis.valueRange because, if you set
2588 // valueRange, you'd still expect to be able to pan.
2589 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2590 } else if (axis
.valueRange
) {
2591 // This is a user-set value range for this axis.
2592 axis
.computedValueRange
= [
2593 isNullUndefinedOrNaN(axis
.valueRange
[0]) ? axis
.extremeRange
[0] : axis
.valueRange
[0],
2594 isNullUndefinedOrNaN(axis
.valueRange
[1]) ? axis
.extremeRange
[1] : axis
.valueRange
[1]
2597 axis
.computedValueRange
= axis
.extremeRange
;
2600 // Add ticks. By default, all axes inherit the tick positions of the
2601 // primary axis. However, if an axis is specifically marked as having
2602 // independent ticks, then that is permissible as well.
2603 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2604 var ticker
= opts('ticker');
2605 if (i
=== 0 || axis
.independentTicks
) {
2606 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2607 axis
.computedValueRange
[1],
2608 this.height_
, // TODO(danvk): should be area.height
2612 var p_axis
= this.axes_
[0];
2613 var p_ticks
= p_axis
.ticks
;
2614 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2615 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2616 var tick_values
= [];
2617 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2618 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2619 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2620 tick_values
.push(y_val
);
2623 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2624 axis
.computedValueRange
[1],
2625 this.height_
, // TODO(danvk): should be area.height
2634 * Extracts one series from the raw data (a 2D array) into an array of (date,
2637 * This is where undesirable points (i.e. negative values on log scales and
2638 * missing values through which we wish to connect lines) are dropped.
2639 * TODO(danvk): the "missing values" bit above doesn't seem right.
2643 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2644 // TODO(danvk): pre-allocate series here.
2646 for (var j
= 0; j
< rawData
.length
; j
++) {
2647 var x
= rawData
[j
][0];
2648 var point
= rawData
[j
][i
];
2650 // On the log scale, points less than zero do not exist.
2651 // This will create a gap in the chart.
2656 series
.push([x
, point
]);
2663 * Calculates the rolling average of a data set.
2664 * If originalData is [label, val], rolls the average of those.
2665 * If originalData is [label, [, it's interpreted as [value, stddev]
2666 * and the roll is returned in the same form, with appropriately reduced
2667 * stddev for each value.
2668 * Note that this is where fractional input (i.e. '5/10') is converted into
2670 * @param {Array} originalData The data in the appropriate format (see above)
2671 * @param {Number} rollPeriod The number of points over which to average the
2674 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2675 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2676 var rollingData
= [];
2677 var sigma
= this.attr_("sigma");
2679 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2680 if (this.fractions_
) {
2682 var den
= 0; // numerator/denominator
2684 for (i
= 0; i
< originalData
.length
; i
++) {
2685 num
+= originalData
[i
][1][0];
2686 den
+= originalData
[i
][1][1];
2687 if (i
- rollPeriod
>= 0) {
2688 num
-= originalData
[i
- rollPeriod
][1][0];
2689 den
-= originalData
[i
- rollPeriod
][1][1];
2692 var date
= originalData
[i
][0];
2693 var value
= den
? num
/ den
: 0.0;
2694 if (this.attr_("errorBars")) {
2695 if (this.attr_("wilsonInterval")) {
2696 // For more details on this confidence interval, see:
2697 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2699 var p
= value
< 0 ? 0 : value
, n
= den
;
2700 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2701 var denom
= 1 + sigma
* sigma
/ den
;
2702 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2703 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2704 rollingData
[i
] = [date
,
2705 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2707 rollingData
[i
] = [date
, [0, 0, 0]];
2710 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2711 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2714 rollingData
[i
] = [date
, mult
* value
];
2717 } else if (this.attr_("customBars")) {
2722 for (i
= 0; i
< originalData
.length
; i
++) {
2723 var data
= originalData
[i
][1];
2725 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2727 if (y
!== null && !isNaN(y
)) {
2733 if (i
- rollPeriod
>= 0) {
2734 var prev
= originalData
[i
- rollPeriod
];
2735 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2743 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2744 1.0 * (mid
- low
) / count
,
2745 1.0 * (high
- mid
) / count
]];
2747 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2751 // Calculate the rolling average for the first rollPeriod - 1 points where
2752 // there is not enough data to roll over the full number of points
2753 if (!this.attr_("errorBars")){
2754 if (rollPeriod
== 1) {
2755 return originalData
;
2758 for (i
= 0; i
< originalData
.length
; i
++) {
2761 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2762 y
= originalData
[j
][1];
2763 if (y
=== null || isNaN(y
)) continue;
2765 sum
+= originalData
[j
][1];
2768 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2770 rollingData
[i
] = [originalData
[i
][0], null];
2775 for (i
= 0; i
< originalData
.length
; i
++) {
2779 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2780 y
= originalData
[j
][1][0];
2781 if (y
=== null || isNaN(y
)) continue;
2783 sum
+= originalData
[j
][1][0];
2784 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2787 stddev
= Math
.sqrt(variance
) / num_ok
;
2788 rollingData
[i
] = [originalData
[i
][0],
2789 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2791 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2801 * Detects the type of the str (date or numeric) and sets the various
2802 * formatting attributes in this.attrs_ based on this type.
2803 * @param {String} str An x value.
2806 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2808 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2809 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2810 str
.indexOf('/') >= 0 ||
2811 isNaN(parseFloat(str
))) {
2813 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2814 // TODO(danvk): remove support for this format.
2818 this.setXAxisOptions_(isDate
);
2821 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2823 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2824 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2825 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2826 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2828 /** @private (shut up, jsdoc!) */
2829 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2830 // TODO(danvk): use Dygraph.numberValueFormatter here?
2831 /** @private (shut up, jsdoc!) */
2832 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2833 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2834 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2839 * Parses the value as a floating point number. This is like the parseFloat()
2840 * built-in, but with a few differences:
2841 * - the empty string is parsed as null, rather than NaN.
2842 * - if the string cannot be parsed at all, an error is logged.
2843 * If the string can't be parsed, this method returns null.
2844 * @param {String} x The string to be parsed
2845 * @param {Number} opt_line_no The line number from which the string comes.
2846 * @param {String} opt_line The text of the line from which the string comes.
2850 // Parse the x as a float or return null if it's not a number.
2851 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2852 var val
= parseFloat(x
);
2853 if (!isNaN(val
)) return val
;
2855 // Try to figure out what happeend.
2856 // If the value is the empty string, parse it as null.
2857 if (/^ *$/.test(x
)) return null;
2859 // If it was actually "NaN", return it as NaN.
2860 if (/^ *nan *$/i.test(x
)) return NaN
;
2862 // Looks like a parsing error.
2863 var msg
= "Unable to parse '" + x
+ "' as a number";
2864 if (opt_line
!== null && opt_line_no
!== null) {
2865 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2874 * Parses a string in a special csv format. We expect a csv file where each
2875 * line is a date point, and the first field in each line is the date string.
2876 * We also expect that all remaining fields represent series.
2877 * if the errorBars attribute is set, then interpret the fields as:
2878 * date, series1, stddev1, series2, stddev2, ...
2879 * @param {[Object]} data See above.
2881 * @return [Object] An array with one entry for each row. These entries
2882 * are an array of cells in that row. The first entry is the parsed x-value for
2883 * the row. The second, third, etc. are the y-values. These can take on one of
2884 * three forms, depending on the CSV and constructor parameters:
2886 * 2. [ value, stddev ]
2887 * 3. [ low value, center value, high value ]
2889 Dygraph
.prototype.parseCSV_
= function(data
) {
2891 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2892 var lines
= data
.split(line_delimiter
|| "\n");
2895 // Use the default delimiter or fall back to a tab if that makes sense.
2896 var delim
= this.attr_('delimiter');
2897 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2902 if (!('labels' in this.user_attrs_
)) {
2903 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2905 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2906 this.attributes_
.reparseSeries();
2911 var defaultParserSet
= false; // attempt to auto-detect x value type
2912 var expectedCols
= this.attr_("labels").length
;
2913 var outOfOrder
= false;
2914 for (var i
= start
; i
< lines
.length
; i
++) {
2915 var line
= lines
[i
];
2917 if (line
.length
=== 0) continue; // skip blank lines
2918 if (line
[0] == '#') continue; // skip comment lines
2919 var inFields
= line
.split(delim
);
2920 if (inFields
.length
< 2) continue;
2923 if (!defaultParserSet
) {
2924 this.detectTypeFromString_(inFields
[0]);
2925 xParser
= this.attr_("xValueParser");
2926 defaultParserSet
= true;
2928 fields
[0] = xParser(inFields
[0], this);
2930 // If fractions are expected, parse the numbers as "A/B
"
2931 if (this.fractions_) {
2932 for (j = 1; j < inFields.length; j++) {
2933 // TODO(danvk): figure out an appropriate way to flag parse errors.
2934 vals = inFields[j].split("/");
2935 if (vals.length != 2) {
2936 this.error('Expected fractional "num
/den
" values in CSV data ' +
2937 "but found a value
'" + inFields[j] + "' on line
" +
2938 (1 + i) + " ('" + line + "') which is not of
this form
.");
2941 fields[j] = [this.parseFloat_(vals[0], i, line),
2942 this.parseFloat_(vals[1], i, line)];
2945 } else if (this.attr_("errorBars
")) {
2946 // If there are error bars, values are (value, stddev) pairs
2947 if (inFields.length % 2 != 1) {
2948 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2949 'but line ' + (1 + i) + ' has an odd number of values (' +
2950 (inFields.length - 1) + "): '" + line + "'");
2952 for (j = 1; j < inFields.length; j += 2) {
2953 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2954 this.parseFloat_(inFields[j + 1], i, line)];
2956 } else if (this.attr_("customBars
")) {
2957 // Bars are a low;center;high tuple
2958 for (j = 1; j < inFields.length; j++) {
2959 var val = inFields[j];
2960 if (/^ *$/.test(val)) {
2961 fields[j] = [null, null, null];
2963 vals = val.split(";");
2964 if (vals.length == 3) {
2965 fields[j] = [ this.parseFloat_(vals[0], i, line),
2966 this.parseFloat_(vals[1], i, line),
2967 this.parseFloat_(vals[2], i, line) ];
2969 this.warn('When using customBars, values must be either blank ' +
2970 'or "low
;center
;high
" tuples (got "' + val +
2971 '" on line ' + (1+i));
2976 // Values are just numbers
2977 for (j = 1; j < inFields.length; j++) {
2978 fields[j] = this.parseFloat_(inFields[j], i, line);
2981 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2985 if (fields.length != expectedCols) {
2986 this.error("Number of columns
in line
" + i + " (" + fields.length +
2987 ") does not agree
with number of
labels (" + expectedCols +
2991 // If the user specified the 'labels' option and none of the cells of the
2992 // first row parsed correctly, then they probably double-specified the
2993 // labels. We go with the values set in the option, discard this row and
2994 // log a warning to the JS console.
2995 if (i === 0 && this.attr_('labels')) {
2996 var all_null = true;
2997 for (j = 0; all_null && j < fields.length; j++) {
2998 if (fields[j]) all_null = false;
3001 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3002 "CSV
data ('" + line + "') appears to also contain labels
. " +
3003 "Will drop the CSV labels and
use the option labels
.");
3011 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3012 ret.sort(function(a,b) { return a[0] - b[0]; });
3020 * The user has provided their data as a pre-packaged JS array. If the x values
3021 * are numeric, this is the same as dygraphs' internal format. If the x values
3022 * are dates, we need to convert them from Date objects to ms since epoch.
3023 * @param {[Object]} data
3024 * @return {[Object]} data with numeric x values.
3026 Dygraph.prototype.parseArray_ = function(data) {
3027 // Peek at the first x value to see if it's numeric.
3028 if (data.length === 0) {
3029 this.error("Can
't plot empty data set");
3032 if (data[0].length === 0) {
3033 this.error("Data set cannot contain an empty row");
3038 if (this.attr_("labels") === null) {
3039 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3040 "in the options parameter");
3041 this.attrs_.labels = [ "X" ];
3042 for (i = 1; i < data[0].length; i++) {
3043 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3045 this.attributes_.reparseSeries();
3047 var num_labels = this.attr_("labels");
3048 if (num_labels.length != data[0].length) {
3049 this.error("Mismatch between number of labels (" + num_labels +
3050 ") and number of columns in array (" + data[0].length + ")");
3055 if (Dygraph.isDateLike(data[0][0])) {
3056 // Some intelligent defaults for a date x-axis.
3057 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3058 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3059 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3061 // Assume they're all dates
.
3062 var parsedData
= Dygraph
.clone(data
);
3063 for (i
= 0; i
< data
.length
; i
++) {
3064 if (parsedData
[i
].length
=== 0) {
3065 this.error("Row " + (1 + i
) + " of data is empty");
3068 if (parsedData
[i
][0] === null ||
3069 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3070 isNaN(parsedData
[i
][0].getTime())) {
3071 this.error("x value in row " + (1 + i
) + " is not a Date");
3074 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3078 // Some intelligent defaults for a numeric x-axis.
3079 /** @private (shut up, jsdoc!) */
3080 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3081 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3082 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3088 * Parses a DataTable object from gviz.
3089 * The data is expected to have a first column that is either a date or a
3090 * number. All subsequent columns must be numbers. If there is a clear mismatch
3091 * between this.xValueParser_ and the type of the first column, it will be
3092 * fixed. Fills out rawData_.
3093 * @param {[Object]} data See above.
3096 Dygraph
.prototype.parseDataTable_
= function(data
) {
3097 var shortTextForAnnotationNum
= function(num
) {
3098 // converts [0-9]+ [A-Z][a-z]*
3099 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3100 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3101 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3102 num
= Math
.floor(num
/ 26);
3104 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3105 num
= Math
.floor((num
- 1) / 26);
3110 var cols
= data
.getNumberOfColumns();
3111 var rows
= data
.getNumberOfRows();
3113 var indepType
= data
.getColumnType(0);
3114 if (indepType
== 'date' || indepType
== 'datetime') {
3115 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3116 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3117 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3118 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3119 } else if (indepType
== 'number') {
3120 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3121 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3122 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3123 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3125 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3126 "column 1 of DataTable input (Got '" + indepType
+ "')");
3130 // Array of the column indices which contain data (and not annotations).
3132 var annotationCols
= {}; // data index -> [annotation cols]
3133 var hasAnnotations
= false;
3135 for (i
= 1; i
< cols
; i
++) {
3136 var type
= data
.getColumnType(i
);
3137 if (type
== 'number') {
3139 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3140 // This is OK -- it's an annotation column.
3141 var dataIdx
= colIdx
[colIdx
.length
- 1];
3142 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3143 annotationCols
[dataIdx
] = [i
];
3145 annotationCols
[dataIdx
].push(i
);
3147 hasAnnotations
= true;
3149 this.error("Only 'number' is supported as a dependent type with Gviz." +
3150 " 'string' is only supported if displayAnnotations is true");
3154 // Read column labels
3155 // TODO(danvk): add support back for errorBars
3156 var labels
= [data
.getColumnLabel(0)];
3157 for (i
= 0; i
< colIdx
.length
; i
++) {
3158 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3159 if (this.attr_("errorBars")) i
+= 1;
3161 this.attrs_
.labels
= labels
;
3162 cols
= labels
.length
;
3165 var outOfOrder
= false;
3166 var annotations
= [];
3167 for (i
= 0; i
< rows
; i
++) {
3169 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3170 data
.getValue(i
, 0) === null) {
3171 this.warn("Ignoring row " + i
+
3172 " of DataTable because of undefined or null first column.");
3176 if (indepType
== 'date' || indepType
== 'datetime') {
3177 row
.push(data
.getValue(i
, 0).getTime());
3179 row
.push(data
.getValue(i
, 0));
3181 if (!this.attr_("errorBars")) {
3182 for (j
= 0; j
< colIdx
.length
; j
++) {
3183 var col
= colIdx
[j
];
3184 row
.push(data
.getValue(i
, col
));
3185 if (hasAnnotations
&&
3186 annotationCols
.hasOwnProperty(col
) &&
3187 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3189 ann
.series
= data
.getColumnLabel(col
);
3191 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3193 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3194 if (k
) ann
.text
+= "\n";
3195 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3197 annotations
.push(ann
);
3201 // Strip out infinities, which give dygraphs problems later on.
3202 for (j
= 0; j
< row
.length
; j
++) {
3203 if (!isFinite(row
[j
])) row
[j
] = null;
3206 for (j
= 0; j
< cols
- 1; j
++) {
3207 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3210 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3217 this.warn("DataTable is out of order; order it correctly to speed loading.");
3218 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3220 this.rawData_
= ret
;
3222 if (annotations
.length
> 0) {
3223 this.setAnnotations(annotations
, true);
3225 this.attributes_
.reparseSeries();
3229 * Get the CSV data. If it's in a function, call that function. If it's in a
3230 * file, do an XMLHttpRequest to get it.
3233 Dygraph
.prototype.start_
= function() {
3234 var data
= this.file_
;
3236 // Functions can return references of all other types.
3237 if (typeof data
== 'function') {
3241 if (Dygraph
.isArrayLike(data
)) {
3242 this.rawData_
= this.parseArray_(data
);
3244 } else if (typeof data
== 'object' &&
3245 typeof data
.getColumnRange
== 'function') {
3246 // must be a DataTable from gviz.
3247 this.parseDataTable_(data
);
3249 } else if (typeof data
== 'string') {
3250 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3251 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3252 if (line_delimiter
) {
3253 this.loadedEvent_(data
);
3255 var req
= new XMLHttpRequest();
3257 req
.onreadystatechange
= function () {
3258 if (req
.readyState
== 4) {
3259 if (req
.status
=== 200 || // Normal http
3260 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3261 caller
.loadedEvent_(req
.responseText
);
3266 req
.open("GET", data
, true);
3270 this.error("Unknown data format: " + (typeof data
));
3275 * Changes various properties of the graph. These can include:
3277 * <li>file: changes the source data for the graph</li>
3278 * <li>errorBars: changes whether the data contains stddev</li>
3281 * There's a huge variety of options that can be passed to this method. For a
3282 * full list, see http://dygraphs.com/options.html.
3284 * @param {Object} attrs The new properties and values
3285 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3286 * call to updateOptions(). If you know better, you can pass true to explicitly
3287 * block the redraw. This can be useful for chaining updateOptions() calls,
3288 * avoiding the occasional infinite loop and preventing redraws when it's not
3289 * necessary (e.g. when updating a callback).
3291 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3292 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3294 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3295 var file
= input_attrs
.file
;
3296 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3298 // TODO(danvk): this is a mess. Move these options into attr_.
3299 if ('rollPeriod' in attrs
) {
3300 this.rollPeriod_
= attrs
.rollPeriod
;
3302 if ('dateWindow' in attrs
) {
3303 this.dateWindow_
= attrs
.dateWindow
;
3304 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3305 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3308 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3309 this.zoomed_y_
= (attrs
.valueRange
!== null);
3312 // TODO(danvk): validate per-series options.
3317 // highlightCircleSize
3319 // Check if this set options will require new points.
3320 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3322 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3324 this.attributes_
.reparseSeries();
3328 if (!block_redraw
) this.start_();
3330 if (!block_redraw
) {
3331 if (requiresNewPoints
) {
3334 this.renderGraph_(false);
3341 * Returns a copy of the options with deprecated names converted into current
3342 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3343 * interested in that, they should save a copy before calling this.
3346 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3348 for (var k
in attrs
) {
3349 if (k
== 'file') continue;
3350 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3353 var set
= function(axis
, opt
, value
) {
3354 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3355 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3356 my_attrs
.axes
[axis
][opt
] = value
;
3358 var map
= function(opt
, axis
, new_opt
) {
3359 if (typeof(attrs
[opt
]) != 'undefined') {
3360 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3361 new_opt
+ " option for the " + axis
+ " axis instead. " +
3362 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3363 "(see http://dygraphs.com/per-axis.html for more information.");
3364 set(axis
, new_opt
, attrs
[opt
]);
3365 delete my_attrs
[opt
];
3369 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3370 map('xValueFormatter', 'x', 'valueFormatter');
3371 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3372 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3373 map('xTicker', 'x', 'ticker');
3374 map('yValueFormatter', 'y', 'valueFormatter');
3375 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3376 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3377 map('yTicker', 'y', 'ticker');
3382 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3383 * containing div (which has presumably changed size since the dygraph was
3384 * instantiated. If the width/height are specified, the div will be resized.
3386 * This is far more efficient than destroying and re-instantiating a
3387 * Dygraph, since it doesn't have to reparse the underlying data.
3389 * @param {Number} [width] Width (in pixels)
3390 * @param {Number} [height] Height (in pixels)
3392 Dygraph
.prototype.resize
= function(width
, height
) {
3393 if (this.resize_lock
) {
3396 this.resize_lock
= true;
3398 if ((width
=== null) != (height
=== null)) {
3399 this.warn("Dygraph.resize() should be called with zero parameters or " +
3400 "two non-NULL parameters. Pretending it was zero.");
3401 width
= height
= null;
3404 var old_width
= this.width_
;
3405 var old_height
= this.height_
;
3408 this.maindiv_
.style
.width
= width
+ "px";
3409 this.maindiv_
.style
.height
= height
+ "px";
3410 this.width_
= width
;
3411 this.height_
= height
;
3413 this.width_
= this.maindiv_
.clientWidth
;
3414 this.height_
= this.maindiv_
.clientHeight
;
3417 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3418 // TODO(danvk): there should be a clear() method.
3419 this.maindiv_
.innerHTML
= "";
3420 this.roller_
= null;
3421 this.attrs_
.labelsDiv
= null;
3422 this.createInterface_();
3423 if (this.annotations_
.length
) {
3424 // createInterface_ reset the layout, so we need to do this.
3425 this.layout_
.setAnnotations(this.annotations_
);
3427 this.createDragInterface_();
3431 this.resize_lock
= false;
3435 * Adjusts the number of points in the rolling average. Updates the graph to
3436 * reflect the new averaging period.
3437 * @param {Number} length Number of points over which to average the data.
3439 Dygraph
.prototype.adjustRoll
= function(length
) {
3440 this.rollPeriod_
= length
;
3445 * Returns a boolean array of visibility statuses.
3447 Dygraph
.prototype.visibility
= function() {
3448 // Do lazy-initialization, so that this happens after we know the number of
3450 if (!this.attr_("visibility")) {
3451 this.attrs_
.visibility
= [];
3453 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3454 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3455 this.attrs_
.visibility
.push(true);
3457 return this.attr_("visibility");
3461 * Changes the visiblity of a series.
3463 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3464 var x
= this.visibility();
3465 if (num
< 0 || num
>= x
.length
) {
3466 this.warn("invalid series number in setVisibility: " + num
);
3474 * How large of an area will the dygraph render itself in?
3475 * This is used for testing.
3476 * @return A {width: w, height: h} object.
3479 Dygraph
.prototype.size
= function() {
3480 return { width
: this.width_
, height
: this.height_
};
3484 * Update the list of annotations and redraw the chart.
3485 * See dygraphs.com/annotations.html for more info on how to use annotations.
3486 * @param ann {Array} An array of annotation objects.
3487 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3489 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3490 // Only add the annotation CSS rule once we know it will be used.
3491 Dygraph
.addAnnotationRule();
3492 this.annotations_
= ann
;
3493 this.layout_
.setAnnotations(this.annotations_
);
3494 if (!suppressDraw
) {
3500 * Return the list of annotations.
3502 Dygraph
.prototype.annotations
= function() {
3503 return this.annotations_
;
3507 * Get the list of label names for this graph. The first column is the
3508 * x-axis, so the data series names start at index 1.
3510 * Returns null when labels have not yet been defined.
3512 Dygraph
.prototype.getLabels
= function() {
3513 var labels
= this.attr_("labels");
3514 return labels
? labels
.slice() : null;
3518 * Get the index of a series (column) given its name. The first column is the
3519 * x-axis, so the data series start with index 1.
3521 Dygraph
.prototype.indexFromSetName
= function(name
) {
3522 return this.setIndexByName_
[name
];
3526 * Get the internal dataset index given its name. These are numbered starting from 0,
3527 * and only count visible sets.
3530 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3531 return this.datasetIndex_
[this.indexFromSetName(name
)];
3536 * Adds a default style for the annotation CSS classes to the document. This is
3537 * only executed when annotations are actually used. It is designed to only be
3538 * called once -- all calls after the first will return immediately.
3540 Dygraph
.addAnnotationRule
= function() {
3541 // TODO(danvk): move this function into plugins/annotations.js
?
3542 if (Dygraph
.addedAnnotationCSS
) return;
3544 var rule
= "border: 1px solid black; " +
3545 "background-color: white; " +
3546 "text-align: center;";
3548 var styleSheetElement
= document
.createElement("style");
3549 styleSheetElement
.type
= "text/css";
3550 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3552 // Find the first style sheet that we can access.
3553 // We may not add a rule to a style sheet from another domain for security
3554 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3555 // adds its own style sheets from google.com.
3556 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3557 if (document
.styleSheets
[i
].disabled
) continue;
3558 var mysheet
= document
.styleSheets
[i
];
3560 if (mysheet
.insertRule
) { // Firefox
3561 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3562 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3563 } else if (mysheet
.addRule
) { // IE
3564 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3566 Dygraph
.addedAnnotationCSS
= true;
3569 // Was likely a security exception.
3573 this.warn("Unable to add default annotation CSS rule; display may be off.");
3576 // Older pages may still use this name.
3577 var DateGraph
= Dygraph
;