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 if (event
.offsetX
&& event
.offsetY
) {
1625 return [ event
.offsetX
, event
.offsetY
];
1627 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1628 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1629 return [canvasx
, canvasy
];
1634 * Given a canvas X coordinate, find the closest row.
1635 * @param {Number} domX graph-relative DOM X coordinate
1636 * Returns: row number, integer
1639 Dygraph
.prototype.findClosestRow
= function(domX
) {
1640 var minDistX
= Infinity
;
1641 var pointIdx
= -1, setIdx
= -1;
1642 var sets
= this.layout_
.points
;
1643 for (var i
= 0; i
< sets
.length
; i
++) {
1644 var points
= sets
[i
];
1645 var len
= points
.length
;
1646 for (var j
= 0; j
< len
; j
++) {
1647 var point
= points
[j
];
1648 if (!Dygraph
.isValidPoint(point
, true)) continue;
1649 var dist
= Math
.abs(point
.canvasx
- domX
);
1650 if (dist
< minDistX
) {
1658 // TODO(danvk): remove this function; it's trivial and has only one use.
1659 return this.idxToRow_(setIdx
, pointIdx
);
1663 * Given canvas X,Y coordinates, find the closest point.
1665 * This finds the individual data point across all visible series
1666 * that's closest to the supplied DOM coordinates using the standard
1667 * Euclidean X,Y distance.
1669 * @param {Number} domX graph-relative DOM X coordinate
1670 * @param {Number} domY graph-relative DOM Y coordinate
1671 * Returns: {row, seriesName, point}
1674 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1675 var minDist
= Infinity
;
1677 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1678 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1679 var points
= this.layout_
.points
[setIdx
];
1680 for (var i
= 0; i
< points
.length
; ++i
) {
1681 var point
= points
[i
];
1682 if (!Dygraph
.isValidPoint(point
)) continue;
1683 dx
= point
.canvasx
- domX
;
1684 dy
= point
.canvasy
- domY
;
1685 dist
= dx
* dx
+ dy
* dy
;
1686 if (dist
< minDist
) {
1688 closestPoint
= point
;
1689 closestSeries
= setIdx
;
1694 var name
= this.layout_
.setNames
[closestSeries
];
1696 row
: idx
+ this.getLeftBoundary_(),
1703 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1705 * This first finds the X data point closest to the supplied DOM X coordinate,
1706 * then finds the series which puts the Y coordinate on top of its filled area,
1707 * using linear interpolation between adjacent point pairs.
1709 * @param {Number} domX graph-relative DOM X coordinate
1710 * @param {Number} domY graph-relative DOM Y coordinate
1711 * Returns: {row, seriesName, point}
1714 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1715 var row
= this.findClosestRow(domX
);
1716 var boundary
= this.getLeftBoundary_();
1717 var rowIdx
= row
- boundary
;
1718 var closestPoint
, closestSeries
;
1719 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1720 var points
= this.layout_
.points
[setIdx
];
1721 if (rowIdx
>= points
.length
) continue;
1722 var p1
= points
[rowIdx
];
1723 if (!Dygraph
.isValidPoint(p1
)) continue;
1724 var py
= p1
.canvasy
;
1725 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1726 // interpolate series Y value using next point
1727 var p2
= points
[rowIdx
+ 1];
1728 if (Dygraph
.isValidPoint(p2
)) {
1729 var dx
= p2
.canvasx
- p1
.canvasx
;
1731 var r
= (domX
- p1
.canvasx
) / dx
;
1732 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1735 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1736 // interpolate series Y value using previous point
1737 var p0
= points
[rowIdx
- 1];
1738 if (Dygraph
.isValidPoint(p0
)) {
1739 var dx
= p1
.canvasx
- p0
.canvasx
;
1741 var r
= (p1
.canvasx
- domX
) / dx
;
1742 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1746 // Stop if the point (domX, py) is above this series' upper edge
1747 if (setIdx
=== 0 || py
< domY
) {
1749 closestSeries
= setIdx
;
1752 var name
= this.layout_
.setNames
[closestSeries
];
1761 * When the mouse moves in the canvas, display information about a nearby data
1762 * point and draw dots over those points in the data series. This function
1763 * takes care of cleanup of previously-drawn dots.
1764 * @param {Object} event The mousemove event from the browser.
1767 Dygraph
.prototype.mouseMove_
= function(event
) {
1768 // This prevents JS errors when mousing over the canvas before data loads.
1769 var points
= this.layout_
.points
;
1770 if (points
=== undefined
|| points
=== null) return;
1772 var canvasCoords
= this.eventToDomCoords(event
);
1773 var canvasx
= canvasCoords
[0];
1774 var canvasy
= canvasCoords
[1];
1776 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1777 var selectionChanged
= false;
1778 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1780 if (this.attr_("stackedGraph")) {
1781 closest
= this.findStackedPoint(canvasx
, canvasy
);
1783 closest
= this.findClosestPoint(canvasx
, canvasy
);
1785 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1787 var idx
= this.findClosestRow(canvasx
);
1788 selectionChanged
= this.setSelection(idx
);
1791 var callback
= this.attr_("highlightCallback");
1792 if (callback
&& selectionChanged
) {
1793 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1798 * Fetch left offset from first defined boundaryIds record (see bug #236).
1801 Dygraph
.prototype.getLeftBoundary_
= function() {
1802 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1803 if (this.boundaryIds_
[i
] !== undefined
) {
1804 return this.boundaryIds_
[i
][0];
1811 * Transforms layout_.points index into data row number.
1812 * @param int layout_.points index
1813 * @return int row number, or -1 if none could be found.
1816 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1817 if (rowIdx
< 0) return -1;
1819 var boundary
= this.getLeftBoundary_();
1820 return boundary
+ rowIdx
;
1821 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1822 // var set = this.layout_.datasets[setIdx];
1823 // if (idx < set.length) {
1824 // return boundary + idx;
1826 // idx -= set.length;
1831 Dygraph
.prototype.animateSelection_
= function(direction
) {
1832 var totalSteps
= 10;
1834 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1835 if (this.animateId
=== undefined
) this.animateId
= 0;
1836 var start
= this.fadeLevel
;
1837 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1839 if (this.fadeLevel
) {
1840 this.updateSelection_(1.0);
1845 var thisId
= ++this.animateId
;
1847 Dygraph
.repeatAndCleanup(
1849 // ignore simultaneous animations
1850 if (that
.animateId
!= thisId
) return;
1852 that
.fadeLevel
+= direction
;
1853 if (that
.fadeLevel
=== 0) {
1854 that
.clearSelection();
1856 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1859 steps
, millis
, function() {});
1863 * Draw dots over the selectied points in the data series. This function
1864 * takes care of cleanup of previously-drawn dots.
1867 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1868 /*var defaultPrevented = */
1869 this.cascadeEvents_('select', {
1870 selectedX
: this.lastx_
,
1871 selectedPoints
: this.selPoints_
1873 // TODO(danvk): use defaultPrevented here?
1875 // Clear the previously drawn vertical, if there is one
1877 var ctx
= this.canvas_ctx_
;
1878 if (this.attr_('highlightSeriesOpts')) {
1879 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1880 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1882 // Activating background fade includes an animation effect for a gradual
1883 // fade. TODO(klausw): make this independently configurable if it causes
1884 // issues? Use a shared preference to control animations?
1885 var animateBackgroundFade
= true;
1886 if (animateBackgroundFade
) {
1887 if (opt_animFraction
=== undefined
) {
1888 // start a new animation
1889 this.animateSelection_(1);
1892 alpha
*= opt_animFraction
;
1894 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1895 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1898 // Redraw only the highlighted series in the interactive canvas (not the
1899 // static plot canvas, which is where series are usually drawn).
1900 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1901 } else if (this.previousVerticalX_
>= 0) {
1902 // Determine the maximum highlight circle size.
1903 var maxCircleSize
= 0;
1904 var labels
= this.attr_('labels');
1905 for (i
= 1; i
< labels
.length
; i
++) {
1906 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1907 if (r
> maxCircleSize
) maxCircleSize
= r
;
1909 var px
= this.previousVerticalX_
;
1910 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1911 2 * maxCircleSize
+ 2, this.height_
);
1914 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1915 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1918 if (this.selPoints_
.length
> 0) {
1919 // Draw colored circles over the center of each selected point
1920 var canvasx
= this.selPoints_
[0].canvasx
;
1922 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1923 var pt
= this.selPoints_
[i
];
1924 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1926 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1927 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1928 var color
= this.plotter_
.colors
[pt
.name
];
1930 callback
= Dygraph
.Circles
.DEFAULT
;
1932 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1933 ctx
.strokeStyle
= color
;
1934 ctx
.fillStyle
= color
;
1935 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1940 this.previousVerticalX_
= canvasx
;
1945 * Manually set the selected points and display information about them in the
1946 * legend. The selection can be cleared using clearSelection() and queried
1947 * using getSelection().
1948 * @param { Integer } row number that should be highlighted (i.e. appear with
1949 * hover dots on the chart). Set to false to clear any selection.
1950 * @param { seriesName } optional series name to highlight that series with the
1951 * the highlightSeriesOpts setting.
1952 * @param { locked } optional If true, keep seriesName selected when mousing
1953 * over the graph, disabling closest-series highlighting. Call clearSelection()
1956 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
1957 // Extract the points we've selected
1958 this.selPoints_
= [];
1960 if (row
!== false) {
1961 row
-= this.getLeftBoundary_();
1964 var changed
= false;
1965 if (row
!== false && row
>= 0) {
1966 if (row
!= this.lastRow_
) changed
= true;
1967 this.lastRow_
= row
;
1968 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1969 var set
= this.layout_
.datasets
[setIdx
];
1970 if (row
< set
.length
) {
1971 var point
= this.layout_
.points
[setIdx
][row
];
1973 if (this.attr_("stackedGraph")) {
1974 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
1977 if (point
.yval
!== null) this.selPoints_
.push(point
);
1981 if (this.lastRow_
>= 0) changed
= true;
1985 if (this.selPoints_
.length
) {
1986 this.lastx_
= this.selPoints_
[0].xval
;
1991 if (opt_seriesName
!== undefined
) {
1992 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1993 this.highlightSet_
= opt_seriesName
;
1996 if (opt_locked
!== undefined
) {
1997 this.lockedSet_
= opt_locked
;
2001 this.updateSelection_(undefined
);
2007 * The mouse has left the canvas. Clear out whatever artifacts remain
2008 * @param {Object} event the mouseout event from the browser.
2011 Dygraph
.prototype.mouseOut_
= function(event
) {
2012 if (this.attr_("unhighlightCallback")) {
2013 this.attr_("unhighlightCallback")(event
);
2016 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
2017 this.clearSelection();
2022 * Clears the current selection (i.e. points that were highlighted by moving
2023 * the mouse over the chart).
2025 Dygraph
.prototype.clearSelection
= function() {
2026 this.cascadeEvents_('deselect', {});
2028 this.lockedSet_
= false;
2029 // Get rid of the overlay data
2030 if (this.fadeLevel
) {
2031 this.animateSelection_(-1);
2034 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2036 this.selPoints_
= [];
2039 this.highlightSet_
= null;
2043 * Returns the number of the currently selected row. To get data for this row,
2044 * you can use the getValue method.
2045 * @return { Integer } row number, or -1 if nothing is selected
2047 Dygraph
.prototype.getSelection
= function() {
2048 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2052 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2053 var points
= this.layout_
.points
[setIdx
];
2054 for (var row
= 0; row
< points
.length
; row
++) {
2055 if (points
[row
].x
== this.selPoints_
[0].x
) {
2056 return row
+ this.getLeftBoundary_();
2064 * Returns the name of the currently-highlighted series.
2065 * Only available when the highlightSeriesOpts option is in use.
2067 Dygraph
.prototype.getHighlightSeries
= function() {
2068 return this.highlightSet_
;
2072 * Returns true if the currently-highlighted series was locked
2073 * via setSelection(..., seriesName, true).
2075 Dygraph
.prototype.isSeriesLocked
= function() {
2076 return this.lockedSet_
;
2080 * Fires when there's data available to be graphed.
2081 * @param {String} data Raw CSV data to be plotted
2084 Dygraph
.prototype.loadedEvent_
= function(data
) {
2085 this.rawData_
= this.parseCSV_(data
);
2090 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2093 Dygraph
.prototype.addXTicks_
= function() {
2094 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2096 if (this.dateWindow_
) {
2097 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2099 range
= this.fullXRange_();
2102 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2103 var xTicks
= xAxisOptionsView('ticker')(
2106 this.width_
, // TODO(danvk): should be area.width
2109 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2110 // console.log(msg);
2111 this.layout_
.setXTicks(xTicks
);
2116 * Computes the range of the data series (including confidence intervals).
2117 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2118 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2119 * @return [low, high]
2121 Dygraph
.prototype.extremeValues_
= function(series
) {
2122 var minY
= null, maxY
= null, j
, y
;
2124 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2126 // With custom bars, maxY is the max of the high values.
2127 for (j
= 0; j
< series
.length
; j
++) {
2128 y
= series
[j
][1][0];
2129 if (y
=== null || isNaN(y
)) continue;
2130 var low
= y
- series
[j
][1][1];
2131 var high
= y
+ series
[j
][1][2];
2132 if (low
> y
) low
= y
; // this can happen with custom bars,
2133 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2134 if (maxY
=== null || high
> maxY
) {
2137 if (minY
=== null || low
< minY
) {
2142 for (j
= 0; j
< series
.length
; j
++) {
2144 if (y
=== null || isNaN(y
)) continue;
2145 if (maxY
=== null || y
> maxY
) {
2148 if (minY
=== null || y
< minY
) {
2154 return [minY
, maxY
];
2159 * This function is called once when the chart's data is changed or the options
2160 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2161 * idea is that values derived from the chart's data can be computed here,
2162 * rather than every time the chart is drawn. This includes things like the
2163 * number of axes, rolling averages, etc.
2165 Dygraph
.prototype.predraw_
= function() {
2166 var start
= new Date();
2168 this.layout_
.computePlotArea();
2170 // TODO(danvk): move more computations out of drawGraph_ and into here.
2171 this.computeYAxes_();
2173 // Create a new plotter.
2174 if (this.plotter_
) {
2175 this.cascadeEvents_('clearChart');
2176 this.plotter_
.clear();
2178 this.plotter_
= new DygraphCanvasRenderer(this,
2183 // The roller sits in the bottom left corner of the chart. We don't know where
2184 // this will be until the options are available, so it's positioned here.
2185 this.createRollInterface_();
2187 this.cascadeEvents_('predraw');
2189 // Convert the raw data (a 2D array) into the internal format and compute
2190 // rolling averages.
2191 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2192 for (var i
= 1; i
< this.numColumns(); i
++) {
2193 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2194 var logScale
= this.attr_('logscale');
2195 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2196 series
= this.rollingAverage(series
, this.rollPeriod_
);
2197 this.rolledSeries_
.push(series
);
2200 // If the data or options have changed, then we'd better redraw.
2203 this.plotter_
.onDoneDrawing();
2205 // This is used to determine whether to do various animations.
2206 var end
= new Date();
2207 this.drawingTimeMs_
= (end
- start
);
2211 * Loop over all fields and create datasets, calculating extreme y-values for
2212 * each series and extreme x-indices as we go.
2214 * dateWindow is passed in as an explicit parameter so that we can compute
2215 * extreme values "speculatively", i.e. without actually setting state on the
2218 * TODO(danvk): make this more of a true function
2219 * @return [ datasets, seriesExtremes, boundaryIds ]
2222 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2223 var boundaryIds
= [];
2224 var cumulative_y
= []; // For stacked series.
2226 var extremes
= {}; // series name -> [low, high]
2229 // Loop over the fields (series). Go from the last to the first,
2230 // because if they're stacked that's how we accumulate the values.
2231 var num_series
= rolledSeries
.length
- 1;
2232 for (i
= num_series
; i
>= 1; i
--) {
2233 if (!this.visibility()[i
- 1]) continue;
2235 // Note: this copy _is_ necessary at the moment.
2236 // If you remove it, it breaks zooming with error bars on.
2237 // TODO(danvk): investigate further & write a test for this.
2239 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2240 series
.push(rolledSeries
[i
][j
]);
2243 // Prune down to the desired range, if necessary (for zooming)
2244 // Because there can be lines going to points outside of the visible area,
2245 // we actually prune to visible points, plus one on either side.
2246 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2248 var low
= dateWindow
[0];
2249 var high
= dateWindow
[1];
2251 // TODO(danvk): do binary search instead of linear search.
2252 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2253 var firstIdx
= null, lastIdx
= null;
2254 for (k
= 0; k
< series
.length
; k
++) {
2255 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2258 if (series
[k
][0] <= high
) {
2262 if (firstIdx
=== null) firstIdx
= 0;
2263 if (firstIdx
> 0) firstIdx
--;
2264 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2265 if (lastIdx
< series
.length
- 1) lastIdx
++;
2266 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2267 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2268 pruned
.push(series
[k
]);
2272 boundaryIds
[i
-1] = [0, series
.length
-1];
2275 var seriesExtremes
= this.extremeValues_(series
);
2278 for (j
=0; j
<series
.length
; j
++) {
2279 series
[j
] = [series
[j
][0],
2284 } else if (this.attr_("stackedGraph")) {
2285 var l
= series
.length
;
2287 for (j
= 0; j
< l
; j
++) {
2288 // If one data set has a NaN, let all subsequent stacked
2289 // sets inherit the NaN -- only start at 0 for the first set.
2290 var x
= series
[j
][0];
2291 if (cumulative_y
[x
] === undefined
) {
2292 cumulative_y
[x
] = 0;
2295 actual_y
= series
[j
][1];
2296 if (actual_y
=== null) {
2297 series
[j
] = [x
, null];
2301 cumulative_y
[x
] += actual_y
;
2303 series
[j
] = [x
, cumulative_y
[x
]];
2305 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2306 seriesExtremes
[1] = cumulative_y
[x
];
2308 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2309 seriesExtremes
[0] = cumulative_y
[x
];
2314 var seriesName
= this.attr_("labels")[i
];
2315 extremes
[seriesName
] = seriesExtremes
;
2316 datasets
[i
] = series
;
2319 // For stacked graphs, a NaN value for any point in the sum should create a
2320 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2321 if (this.attr_("stackedGraph")) {
2322 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2323 // Use the first nonempty dataset to get X values.
2324 if (!datasets
[k
]) continue;
2325 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2326 var x
= datasets
[k
][j
][0];
2327 if (isNaN(cumulative_y
[x
])) {
2328 // Set all Y values to NaN at that X value.
2329 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2330 if (!datasets
[i
]) continue;
2331 datasets
[i
][j
][1] = NaN
;
2339 return [ datasets
, extremes
, boundaryIds
];
2343 * Update the graph with new data. This method is called when the viewing area
2344 * has changed. If the underlying data or options have changed, predraw_ will
2345 * be called before drawGraph_ is called.
2349 Dygraph
.prototype.drawGraph_
= function() {
2350 var start
= new Date();
2352 // This is used to set the second parameter to drawCallback, below.
2353 var is_initial_draw
= this.is_initial_draw_
;
2354 this.is_initial_draw_
= false;
2356 this.layout_
.removeAllDatasets();
2358 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2360 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2361 var datasets
= packed
[0];
2362 var extremes
= packed
[1];
2363 this.boundaryIds_
= packed
[2];
2365 this.setIndexByName_
= {};
2366 var labels
= this.attr_("labels");
2367 if (labels
.length
> 0) {
2368 this.setIndexByName_
[labels
[0]] = 0;
2371 for (var i
= 1; i
< datasets
.length
; i
++) {
2372 this.setIndexByName_
[labels
[i
]] = i
;
2373 if (!this.visibility()[i
- 1]) continue;
2374 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2375 this.datasetIndex_
[i
] = dataIdx
++;
2378 this.computeYAxisRanges_(extremes
);
2379 this.layout_
.setYAxes(this.axes_
);
2383 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2384 var tmp_zoomed_x
= this.zoomed_x_
;
2385 // Tell PlotKit to use this new data and render itself
2386 this.layout_
.setDateWindow(this.dateWindow_
);
2387 this.zoomed_x_
= tmp_zoomed_x
;
2388 this.layout_
.evaluateWithError();
2389 this.renderGraph_(is_initial_draw
);
2391 if (this.attr_("timingName")) {
2392 var end
= new Date();
2393 Dygraph
.info(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2398 * This does the work of drawing the chart. It assumes that the layout and axis
2399 * scales have already been set (e.g. by predraw_).
2403 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2404 this.cascadeEvents_('clearChart');
2405 this.plotter_
.clear();
2407 if (this.attr_('underlayCallback')) {
2408 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2409 // users who expect a deprecated form of this callback.
2410 this.attr_('underlayCallback')(
2411 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2415 canvas
: this.hidden_
,
2416 drawingContext
: this.hidden_ctx_
2418 this.cascadeEvents_('willDrawChart', e
);
2419 this.plotter_
.render();
2420 this.cascadeEvents_('didDrawChart', e
);
2422 // TODO(danvk): is this a performance bottleneck when panning?
2423 // The interaction canvas should already be empty in that situation.
2424 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2425 this.canvas_
.height
);
2427 if (this.attr_("drawCallback") !== null) {
2428 this.attr_("drawCallback")(this, is_initial_draw
);
2434 * Determine properties of the y-axes which are independent of the data
2435 * currently being displayed. This includes things like the number of axes and
2436 * the style of the axes. It does not include the range of each axis and its
2438 * This fills in this.axes_.
2439 * axes_ = [ { options } ]
2440 * indices are into the axes_ array.
2442 Dygraph
.prototype.computeYAxes_
= function() {
2443 // Preserve valueWindow settings if they exist, and if the user hasn't
2444 // specified a new valueRange.
2445 var valueWindows
, axis
, index
, opts
, v
;
2446 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2448 for (index
= 0; index
< this.axes_
.length
; index
++) {
2449 valueWindows
.push(this.axes_
[index
].valueWindow
);
2453 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2454 // data computation as well as options storage.
2455 // Go through once and add all the axes.
2458 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2459 // Add a new axis, making a copy of its per-axis options.
2460 opts
= { g
: this };
2461 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2462 this.axes_
[axis
] = opts
;
2466 // Copy global valueRange option over to the first axis.
2467 // NOTE(konigsberg): Are these two statements necessary?
2468 // I tried removing it. The automated tests pass, and manually
2469 // messing with tests/zoom
.html showed no trouble
.
2470 v
= this.attr_('valueRange');
2471 if (v
) this.axes_
[0].valueRange
= v
;
2473 if (valueWindows
!== undefined
) {
2474 // Restore valueWindow settings.
2476 // When going from two axes back to one, we only restore
2478 var idxCount
= Math
.min(valueWindows
.length
, this.axes_
.length
);
2480 for (index
= 0; index
< idxCount
; index
++) {
2481 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2485 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2487 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2488 v
= opts("valueRange");
2489 if (v
) this.axes_
[axis
].valueRange
= v
;
2490 } else { // To keep old behavior
2491 var axes
= this.user_attrs_
.axes
;
2492 if (axes
&& axes
.y2
) {
2493 v
= axes
.y2
.valueRange
;
2494 if (v
) this.axes_
[axis
].valueRange
= v
;
2501 * Returns the number of y-axes on the chart.
2502 * @return {Number} the number of axes.
2504 Dygraph
.prototype.numAxes
= function() {
2505 return this.attributes_
.numAxes();
2510 * Returns axis properties for the given series.
2511 * @param { String } setName The name of the series for which to get axis
2512 * properties, e.g. 'Y1'.
2513 * @return { Object } The axis properties.
2515 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2516 // TODO(danvk): handle errors.
2517 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2522 * Determine the value range and tick marks for each axis.
2523 * @param {Object} extremes A mapping from seriesName -> [low, high]
2524 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2526 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2528 var isNullUndefinedOrNaN
= function(num
) {
2529 return isNaN(parseFloat(num
));
2532 var numAxes
= this.attributes_
.numAxes();
2534 // Compute extreme values, a span and tick marks for each axis.
2535 for (var i
= 0; i
< numAxes
; i
++) {
2536 var axis
= this.axes_
[i
];
2537 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2538 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2539 series
= this.attributes_
.seriesForAxis(i
);
2541 if (series
.length
=== 0) {
2542 // If no series are defined or visible then use a reasonable default
2543 axis
.extremeRange
= [0, 1];
2545 // Calculate the extremes of extremes.
2546 var minY
= Infinity
; // extremes[series[0]][0];
2547 var maxY
= -Infinity
; // extremes[series[0]][1];
2548 var extremeMinY
, extremeMaxY
;
2550 for (var j
= 0; j
< series
.length
; j
++) {
2551 // this skips invisible series
2552 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2554 // Only use valid extremes to stop null data series' from corrupting the scale.
2555 extremeMinY
= extremes
[series
[j
]][0];
2556 if (extremeMinY
!== null) {
2557 minY
= Math
.min(extremeMinY
, minY
);
2559 extremeMaxY
= extremes
[series
[j
]][1];
2560 if (extremeMaxY
!== null) {
2561 maxY
= Math
.max(extremeMaxY
, maxY
);
2564 if (includeZero
&& minY
> 0) minY
= 0;
2566 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2567 if (minY
== Infinity
) minY
= 0;
2568 if (maxY
== -Infinity
) maxY
= 1;
2570 // Add some padding and round up to an integer to be human-friendly.
2571 var span
= maxY
- minY
;
2572 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2573 if (span
=== 0) { span
= maxY
; }
2575 var maxAxisY
, minAxisY
;
2577 maxAxisY
= maxY
+ 0.1 * span
;
2580 maxAxisY
= maxY
+ 0.1 * span
;
2581 minAxisY
= minY
- 0.1 * span
;
2583 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2584 if (!this.attr_("avoidMinZero")) {
2585 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2586 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2589 if (this.attr_("includeZero")) {
2590 if (maxY
< 0) maxAxisY
= 0;
2591 if (minY
> 0) minAxisY
= 0;
2594 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2596 if (axis
.valueWindow
) {
2597 // This is only set if the user has zoomed on the y-axis. It is never set
2598 // by a user. It takes precedence over axis.valueRange because, if you set
2599 // valueRange, you'd still expect to be able to pan.
2600 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2601 } else if (axis
.valueRange
) {
2602 // This is a user-set value range for this axis.
2603 axis
.computedValueRange
= [
2604 isNullUndefinedOrNaN(axis
.valueRange
[0]) ? axis
.extremeRange
[0] : axis
.valueRange
[0],
2605 isNullUndefinedOrNaN(axis
.valueRange
[1]) ? axis
.extremeRange
[1] : axis
.valueRange
[1]
2608 axis
.computedValueRange
= axis
.extremeRange
;
2611 // Add ticks. By default, all axes inherit the tick positions of the
2612 // primary axis. However, if an axis is specifically marked as having
2613 // independent ticks, then that is permissible as well.
2614 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2615 var ticker
= opts('ticker');
2616 if (i
=== 0 || axis
.independentTicks
) {
2617 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2618 axis
.computedValueRange
[1],
2619 this.height_
, // TODO(danvk): should be area.height
2623 var p_axis
= this.axes_
[0];
2624 var p_ticks
= p_axis
.ticks
;
2625 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2626 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2627 var tick_values
= [];
2628 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2629 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2630 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2631 tick_values
.push(y_val
);
2634 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2635 axis
.computedValueRange
[1],
2636 this.height_
, // TODO(danvk): should be area.height
2645 * Extracts one series from the raw data (a 2D array) into an array of (date,
2648 * This is where undesirable points (i.e. negative values on log scales and
2649 * missing values through which we wish to connect lines) are dropped.
2650 * TODO(danvk): the "missing values" bit above doesn't seem right.
2654 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2655 // TODO(danvk): pre-allocate series here.
2657 for (var j
= 0; j
< rawData
.length
; j
++) {
2658 var x
= rawData
[j
][0];
2659 var point
= rawData
[j
][i
];
2661 // On the log scale, points less than zero do not exist.
2662 // This will create a gap in the chart.
2667 series
.push([x
, point
]);
2674 * Calculates the rolling average of a data set.
2675 * If originalData is [label, val], rolls the average of those.
2676 * If originalData is [label, [, it's interpreted as [value, stddev]
2677 * and the roll is returned in the same form, with appropriately reduced
2678 * stddev for each value.
2679 * Note that this is where fractional input (i.e. '5/10') is converted into
2681 * @param {Array} originalData The data in the appropriate format (see above)
2682 * @param {Number} rollPeriod The number of points over which to average the
2685 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2686 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2687 var rollingData
= [];
2688 var sigma
= this.attr_("sigma");
2690 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2691 if (this.fractions_
) {
2693 var den
= 0; // numerator/denominator
2695 for (i
= 0; i
< originalData
.length
; i
++) {
2696 num
+= originalData
[i
][1][0];
2697 den
+= originalData
[i
][1][1];
2698 if (i
- rollPeriod
>= 0) {
2699 num
-= originalData
[i
- rollPeriod
][1][0];
2700 den
-= originalData
[i
- rollPeriod
][1][1];
2703 var date
= originalData
[i
][0];
2704 var value
= den
? num
/ den
: 0.0;
2705 if (this.attr_("errorBars")) {
2706 if (this.attr_("wilsonInterval")) {
2707 // For more details on this confidence interval, see:
2708 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2710 var p
= value
< 0 ? 0 : value
, n
= den
;
2711 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2712 var denom
= 1 + sigma
* sigma
/ den
;
2713 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2714 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2715 rollingData
[i
] = [date
,
2716 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2718 rollingData
[i
] = [date
, [0, 0, 0]];
2721 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2722 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2725 rollingData
[i
] = [date
, mult
* value
];
2728 } else if (this.attr_("customBars")) {
2733 for (i
= 0; i
< originalData
.length
; i
++) {
2734 var data
= originalData
[i
][1];
2736 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2738 if (y
!== null && !isNaN(y
)) {
2744 if (i
- rollPeriod
>= 0) {
2745 var prev
= originalData
[i
- rollPeriod
];
2746 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2754 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2755 1.0 * (mid
- low
) / count
,
2756 1.0 * (high
- mid
) / count
]];
2758 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2762 // Calculate the rolling average for the first rollPeriod - 1 points where
2763 // there is not enough data to roll over the full number of points
2764 if (!this.attr_("errorBars")){
2765 if (rollPeriod
== 1) {
2766 return originalData
;
2769 for (i
= 0; i
< originalData
.length
; i
++) {
2772 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2773 y
= originalData
[j
][1];
2774 if (y
=== null || isNaN(y
)) continue;
2776 sum
+= originalData
[j
][1];
2779 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2781 rollingData
[i
] = [originalData
[i
][0], null];
2786 for (i
= 0; i
< originalData
.length
; i
++) {
2790 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2791 y
= originalData
[j
][1][0];
2792 if (y
=== null || isNaN(y
)) continue;
2794 sum
+= originalData
[j
][1][0];
2795 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2798 stddev
= Math
.sqrt(variance
) / num_ok
;
2799 rollingData
[i
] = [originalData
[i
][0],
2800 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2802 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2812 * Detects the type of the str (date or numeric) and sets the various
2813 * formatting attributes in this.attrs_ based on this type.
2814 * @param {String} str An x value.
2817 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2819 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2820 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2821 str
.indexOf('/') >= 0 ||
2822 isNaN(parseFloat(str
))) {
2824 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2825 // TODO(danvk): remove support for this format.
2829 this.setXAxisOptions_(isDate
);
2832 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2834 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2835 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2836 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2837 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2839 /** @private (shut up, jsdoc!) */
2840 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2841 // TODO(danvk): use Dygraph.numberValueFormatter here?
2842 /** @private (shut up, jsdoc!) */
2843 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2844 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2845 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2850 * Parses the value as a floating point number. This is like the parseFloat()
2851 * built-in, but with a few differences:
2852 * - the empty string is parsed as null, rather than NaN.
2853 * - if the string cannot be parsed at all, an error is logged.
2854 * If the string can't be parsed, this method returns null.
2855 * @param {String} x The string to be parsed
2856 * @param {Number} opt_line_no The line number from which the string comes.
2857 * @param {String} opt_line The text of the line from which the string comes.
2861 // Parse the x as a float or return null if it's not a number.
2862 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2863 var val
= parseFloat(x
);
2864 if (!isNaN(val
)) return val
;
2866 // Try to figure out what happeend.
2867 // If the value is the empty string, parse it as null.
2868 if (/^ *$/.test(x
)) return null;
2870 // If it was actually "NaN", return it as NaN.
2871 if (/^ *nan *$/i.test(x
)) return NaN
;
2873 // Looks like a parsing error.
2874 var msg
= "Unable to parse '" + x
+ "' as a number";
2875 if (opt_line
!== null && opt_line_no
!== null) {
2876 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2885 * Parses a string in a special csv format. We expect a csv file where each
2886 * line is a date point, and the first field in each line is the date string.
2887 * We also expect that all remaining fields represent series.
2888 * if the errorBars attribute is set, then interpret the fields as:
2889 * date, series1, stddev1, series2, stddev2, ...
2890 * @param {[Object]} data See above.
2892 * @return [Object] An array with one entry for each row. These entries
2893 * are an array of cells in that row. The first entry is the parsed x-value for
2894 * the row. The second, third, etc. are the y-values. These can take on one of
2895 * three forms, depending on the CSV and constructor parameters:
2897 * 2. [ value, stddev ]
2898 * 3. [ low value, center value, high value ]
2900 Dygraph
.prototype.parseCSV_
= function(data
) {
2902 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2903 var lines
= data
.split(line_delimiter
|| "\n");
2906 // Use the default delimiter or fall back to a tab if that makes sense.
2907 var delim
= this.attr_('delimiter');
2908 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2913 if (!('labels' in this.user_attrs_
)) {
2914 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2916 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2917 this.attributes_
.reparseSeries();
2922 var defaultParserSet
= false; // attempt to auto-detect x value type
2923 var expectedCols
= this.attr_("labels").length
;
2924 var outOfOrder
= false;
2925 for (var i
= start
; i
< lines
.length
; i
++) {
2926 var line
= lines
[i
];
2928 if (line
.length
=== 0) continue; // skip blank lines
2929 if (line
[0] == '#') continue; // skip comment lines
2930 var inFields
= line
.split(delim
);
2931 if (inFields
.length
< 2) continue;
2934 if (!defaultParserSet
) {
2935 this.detectTypeFromString_(inFields
[0]);
2936 xParser
= this.attr_("xValueParser");
2937 defaultParserSet
= true;
2939 fields
[0] = xParser(inFields
[0], this);
2941 // If fractions are expected, parse the numbers as "A/B
"
2942 if (this.fractions_) {
2943 for (j = 1; j < inFields.length; j++) {
2944 // TODO(danvk): figure out an appropriate way to flag parse errors.
2945 vals = inFields[j].split("/");
2946 if (vals.length != 2) {
2947 this.error('Expected fractional "num
/den
" values in CSV data ' +
2948 "but found a value
'" + inFields[j] + "' on line
" +
2949 (1 + i) + " ('" + line + "') which is not of
this form
.");
2952 fields[j] = [this.parseFloat_(vals[0], i, line),
2953 this.parseFloat_(vals[1], i, line)];
2956 } else if (this.attr_("errorBars
")) {
2957 // If there are error bars, values are (value, stddev) pairs
2958 if (inFields.length % 2 != 1) {
2959 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2960 'but line ' + (1 + i) + ' has an odd number of values (' +
2961 (inFields.length - 1) + "): '" + line + "'");
2963 for (j = 1; j < inFields.length; j += 2) {
2964 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2965 this.parseFloat_(inFields[j + 1], i, line)];
2967 } else if (this.attr_("customBars
")) {
2968 // Bars are a low;center;high tuple
2969 for (j = 1; j < inFields.length; j++) {
2970 var val = inFields[j];
2971 if (/^ *$/.test(val)) {
2972 fields[j] = [null, null, null];
2974 vals = val.split(";");
2975 if (vals.length == 3) {
2976 fields[j] = [ this.parseFloat_(vals[0], i, line),
2977 this.parseFloat_(vals[1], i, line),
2978 this.parseFloat_(vals[2], i, line) ];
2980 this.warn('When using customBars, values must be either blank ' +
2981 'or "low
;center
;high
" tuples (got "' + val +
2982 '" on line ' + (1+i));
2987 // Values are just numbers
2988 for (j = 1; j < inFields.length; j++) {
2989 fields[j] = this.parseFloat_(inFields[j], i, line);
2992 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2996 if (fields.length != expectedCols) {
2997 this.error("Number of columns
in line
" + i + " (" + fields.length +
2998 ") does not agree
with number of
labels (" + expectedCols +
3002 // If the user specified the 'labels' option and none of the cells of the
3003 // first row parsed correctly, then they probably double-specified the
3004 // labels. We go with the values set in the option, discard this row and
3005 // log a warning to the JS console.
3006 if (i === 0 && this.attr_('labels')) {
3007 var all_null = true;
3008 for (j = 0; all_null && j < fields.length; j++) {
3009 if (fields[j]) all_null = false;
3012 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3013 "CSV
data ('" + line + "') appears to also contain labels
. " +
3014 "Will drop the CSV labels and
use the option labels
.");
3022 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3023 ret.sort(function(a,b) { return a[0] - b[0]; });
3031 * The user has provided their data as a pre-packaged JS array. If the x values
3032 * are numeric, this is the same as dygraphs' internal format. If the x values
3033 * are dates, we need to convert them from Date objects to ms since epoch.
3034 * @param {[Object]} data
3035 * @return {[Object]} data with numeric x values.
3037 Dygraph.prototype.parseArray_ = function(data) {
3038 // Peek at the first x value to see if it's numeric.
3039 if (data.length === 0) {
3040 this.error("Can
't plot empty data set");
3043 if (data[0].length === 0) {
3044 this.error("Data set cannot contain an empty row");
3049 if (this.attr_("labels") === null) {
3050 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3051 "in the options parameter");
3052 this.attrs_.labels = [ "X" ];
3053 for (i = 1; i < data[0].length; i++) {
3054 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3056 this.attributes_.reparseSeries();
3058 var num_labels = this.attr_("labels");
3059 if (num_labels.length != data[0].length) {
3060 this.error("Mismatch between number of labels (" + num_labels +
3061 ") and number of columns in array (" + data[0].length + ")");
3066 if (Dygraph.isDateLike(data[0][0])) {
3067 // Some intelligent defaults for a date x-axis.
3068 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3069 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3070 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3072 // Assume they're all dates
.
3073 var parsedData
= Dygraph
.clone(data
);
3074 for (i
= 0; i
< data
.length
; i
++) {
3075 if (parsedData
[i
].length
=== 0) {
3076 this.error("Row " + (1 + i
) + " of data is empty");
3079 if (parsedData
[i
][0] === null ||
3080 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3081 isNaN(parsedData
[i
][0].getTime())) {
3082 this.error("x value in row " + (1 + i
) + " is not a Date");
3085 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3089 // Some intelligent defaults for a numeric x-axis.
3090 /** @private (shut up, jsdoc!) */
3091 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3092 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3093 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3099 * Parses a DataTable object from gviz.
3100 * The data is expected to have a first column that is either a date or a
3101 * number. All subsequent columns must be numbers. If there is a clear mismatch
3102 * between this.xValueParser_ and the type of the first column, it will be
3103 * fixed. Fills out rawData_.
3104 * @param {[Object]} data See above.
3107 Dygraph
.prototype.parseDataTable_
= function(data
) {
3108 var shortTextForAnnotationNum
= function(num
) {
3109 // converts [0-9]+ [A-Z][a-z]*
3110 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3111 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3112 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3113 num
= Math
.floor(num
/ 26);
3115 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3116 num
= Math
.floor((num
- 1) / 26);
3121 var cols
= data
.getNumberOfColumns();
3122 var rows
= data
.getNumberOfRows();
3124 var indepType
= data
.getColumnType(0);
3125 if (indepType
== 'date' || indepType
== 'datetime') {
3126 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3127 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3128 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3129 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3130 } else if (indepType
== 'number') {
3131 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3132 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3133 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3134 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3136 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3137 "column 1 of DataTable input (Got '" + indepType
+ "')");
3141 // Array of the column indices which contain data (and not annotations).
3143 var annotationCols
= {}; // data index -> [annotation cols]
3144 var hasAnnotations
= false;
3146 for (i
= 1; i
< cols
; i
++) {
3147 var type
= data
.getColumnType(i
);
3148 if (type
== 'number') {
3150 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3151 // This is OK -- it's an annotation column.
3152 var dataIdx
= colIdx
[colIdx
.length
- 1];
3153 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3154 annotationCols
[dataIdx
] = [i
];
3156 annotationCols
[dataIdx
].push(i
);
3158 hasAnnotations
= true;
3160 this.error("Only 'number' is supported as a dependent type with Gviz." +
3161 " 'string' is only supported if displayAnnotations is true");
3165 // Read column labels
3166 // TODO(danvk): add support back for errorBars
3167 var labels
= [data
.getColumnLabel(0)];
3168 for (i
= 0; i
< colIdx
.length
; i
++) {
3169 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3170 if (this.attr_("errorBars")) i
+= 1;
3172 this.attrs_
.labels
= labels
;
3173 cols
= labels
.length
;
3176 var outOfOrder
= false;
3177 var annotations
= [];
3178 for (i
= 0; i
< rows
; i
++) {
3180 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3181 data
.getValue(i
, 0) === null) {
3182 this.warn("Ignoring row " + i
+
3183 " of DataTable because of undefined or null first column.");
3187 if (indepType
== 'date' || indepType
== 'datetime') {
3188 row
.push(data
.getValue(i
, 0).getTime());
3190 row
.push(data
.getValue(i
, 0));
3192 if (!this.attr_("errorBars")) {
3193 for (j
= 0; j
< colIdx
.length
; j
++) {
3194 var col
= colIdx
[j
];
3195 row
.push(data
.getValue(i
, col
));
3196 if (hasAnnotations
&&
3197 annotationCols
.hasOwnProperty(col
) &&
3198 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3200 ann
.series
= data
.getColumnLabel(col
);
3202 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3204 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3205 if (k
) ann
.text
+= "\n";
3206 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3208 annotations
.push(ann
);
3212 // Strip out infinities, which give dygraphs problems later on.
3213 for (j
= 0; j
< row
.length
; j
++) {
3214 if (!isFinite(row
[j
])) row
[j
] = null;
3217 for (j
= 0; j
< cols
- 1; j
++) {
3218 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3221 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3228 this.warn("DataTable is out of order; order it correctly to speed loading.");
3229 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3231 this.rawData_
= ret
;
3233 if (annotations
.length
> 0) {
3234 this.setAnnotations(annotations
, true);
3236 this.attributes_
.reparseSeries();
3240 * Get the CSV data. If it's in a function, call that function. If it's in a
3241 * file, do an XMLHttpRequest to get it.
3244 Dygraph
.prototype.start_
= function() {
3245 var data
= this.file_
;
3247 // Functions can return references of all other types.
3248 if (typeof data
== 'function') {
3252 if (Dygraph
.isArrayLike(data
)) {
3253 this.rawData_
= this.parseArray_(data
);
3255 } else if (typeof data
== 'object' &&
3256 typeof data
.getColumnRange
== 'function') {
3257 // must be a DataTable from gviz.
3258 this.parseDataTable_(data
);
3260 } else if (typeof data
== 'string') {
3261 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3262 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3263 if (line_delimiter
) {
3264 this.loadedEvent_(data
);
3266 var req
= new XMLHttpRequest();
3268 req
.onreadystatechange
= function () {
3269 if (req
.readyState
== 4) {
3270 if (req
.status
=== 200 || // Normal http
3271 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3272 caller
.loadedEvent_(req
.responseText
);
3277 req
.open("GET", data
, true);
3281 this.error("Unknown data format: " + (typeof data
));
3286 * Changes various properties of the graph. These can include:
3288 * <li>file: changes the source data for the graph</li>
3289 * <li>errorBars: changes whether the data contains stddev</li>
3292 * There's a huge variety of options that can be passed to this method. For a
3293 * full list, see http://dygraphs.com/options.html.
3295 * @param {Object} attrs The new properties and values
3296 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3297 * call to updateOptions(). If you know better, you can pass true to explicitly
3298 * block the redraw. This can be useful for chaining updateOptions() calls,
3299 * avoiding the occasional infinite loop and preventing redraws when it's not
3300 * necessary (e.g. when updating a callback).
3302 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3303 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3305 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3306 var file
= input_attrs
.file
;
3307 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3309 // TODO(danvk): this is a mess. Move these options into attr_.
3310 if ('rollPeriod' in attrs
) {
3311 this.rollPeriod_
= attrs
.rollPeriod
;
3313 if ('dateWindow' in attrs
) {
3314 this.dateWindow_
= attrs
.dateWindow
;
3315 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3316 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3319 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3320 this.zoomed_y_
= (attrs
.valueRange
!== null);
3323 // TODO(danvk): validate per-series options.
3328 // highlightCircleSize
3330 // Check if this set options will require new points.
3331 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3333 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3335 this.attributes_
.reparseSeries();
3339 if (!block_redraw
) this.start_();
3341 if (!block_redraw
) {
3342 if (requiresNewPoints
) {
3345 this.renderGraph_(false);
3352 * Returns a copy of the options with deprecated names converted into current
3353 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3354 * interested in that, they should save a copy before calling this.
3357 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3359 for (var k
in attrs
) {
3360 if (k
== 'file') continue;
3361 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3364 var set
= function(axis
, opt
, value
) {
3365 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3366 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3367 my_attrs
.axes
[axis
][opt
] = value
;
3369 var map
= function(opt
, axis
, new_opt
) {
3370 if (typeof(attrs
[opt
]) != 'undefined') {
3371 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3372 new_opt
+ " option for the " + axis
+ " axis instead. " +
3373 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3374 "(see http://dygraphs.com/per-axis.html for more information.");
3375 set(axis
, new_opt
, attrs
[opt
]);
3376 delete my_attrs
[opt
];
3380 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3381 map('xValueFormatter', 'x', 'valueFormatter');
3382 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3383 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3384 map('xTicker', 'x', 'ticker');
3385 map('yValueFormatter', 'y', 'valueFormatter');
3386 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3387 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3388 map('yTicker', 'y', 'ticker');
3393 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3394 * containing div (which has presumably changed size since the dygraph was
3395 * instantiated. If the width/height are specified, the div will be resized.
3397 * This is far more efficient than destroying and re-instantiating a
3398 * Dygraph, since it doesn't have to reparse the underlying data.
3400 * @param {Number} [width] Width (in pixels)
3401 * @param {Number} [height] Height (in pixels)
3403 Dygraph
.prototype.resize
= function(width
, height
) {
3404 if (this.resize_lock
) {
3407 this.resize_lock
= true;
3409 if ((width
=== null) != (height
=== null)) {
3410 this.warn("Dygraph.resize() should be called with zero parameters or " +
3411 "two non-NULL parameters. Pretending it was zero.");
3412 width
= height
= null;
3415 var old_width
= this.width_
;
3416 var old_height
= this.height_
;
3419 this.maindiv_
.style
.width
= width
+ "px";
3420 this.maindiv_
.style
.height
= height
+ "px";
3421 this.width_
= width
;
3422 this.height_
= height
;
3424 this.width_
= this.maindiv_
.clientWidth
;
3425 this.height_
= this.maindiv_
.clientHeight
;
3428 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3429 // TODO(danvk): there should be a clear() method.
3430 this.maindiv_
.innerHTML
= "";
3431 this.roller_
= null;
3432 this.attrs_
.labelsDiv
= null;
3433 this.createInterface_();
3434 if (this.annotations_
.length
) {
3435 // createInterface_ reset the layout, so we need to do this.
3436 this.layout_
.setAnnotations(this.annotations_
);
3438 this.createDragInterface_();
3442 this.resize_lock
= false;
3446 * Adjusts the number of points in the rolling average. Updates the graph to
3447 * reflect the new averaging period.
3448 * @param {Number} length Number of points over which to average the data.
3450 Dygraph
.prototype.adjustRoll
= function(length
) {
3451 this.rollPeriod_
= length
;
3456 * Returns a boolean array of visibility statuses.
3458 Dygraph
.prototype.visibility
= function() {
3459 // Do lazy-initialization, so that this happens after we know the number of
3461 if (!this.attr_("visibility")) {
3462 this.attrs_
.visibility
= [];
3464 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3465 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3466 this.attrs_
.visibility
.push(true);
3468 return this.attr_("visibility");
3472 * Changes the visiblity of a series.
3474 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3475 var x
= this.visibility();
3476 if (num
< 0 || num
>= x
.length
) {
3477 this.warn("invalid series number in setVisibility: " + num
);
3485 * How large of an area will the dygraph render itself in?
3486 * This is used for testing.
3487 * @return A {width: w, height: h} object.
3490 Dygraph
.prototype.size
= function() {
3491 return { width
: this.width_
, height
: this.height_
};
3495 * Update the list of annotations and redraw the chart.
3496 * See dygraphs.com/annotations.html for more info on how to use annotations.
3497 * @param ann {Array} An array of annotation objects.
3498 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3500 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3501 // Only add the annotation CSS rule once we know it will be used.
3502 Dygraph
.addAnnotationRule();
3503 this.annotations_
= ann
;
3504 this.layout_
.setAnnotations(this.annotations_
);
3505 if (!suppressDraw
) {
3511 * Return the list of annotations.
3513 Dygraph
.prototype.annotations
= function() {
3514 return this.annotations_
;
3518 * Get the list of label names for this graph. The first column is the
3519 * x-axis, so the data series names start at index 1.
3521 * Returns null when labels have not yet been defined.
3523 Dygraph
.prototype.getLabels
= function() {
3524 var labels
= this.attr_("labels");
3525 return labels
? labels
.slice() : null;
3529 * Get the index of a series (column) given its name. The first column is the
3530 * x-axis, so the data series start with index 1.
3532 Dygraph
.prototype.indexFromSetName
= function(name
) {
3533 return this.setIndexByName_
[name
];
3537 * Get the internal dataset index given its name. These are numbered starting from 0,
3538 * and only count visible sets.
3541 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3542 return this.datasetIndex_
[this.indexFromSetName(name
)];
3547 * Adds a default style for the annotation CSS classes to the document. This is
3548 * only executed when annotations are actually used. It is designed to only be
3549 * called once -- all calls after the first will return immediately.
3551 Dygraph
.addAnnotationRule
= function() {
3552 // TODO(danvk): move this function into plugins/annotations.js
?
3553 if (Dygraph
.addedAnnotationCSS
) return;
3555 var rule
= "border: 1px solid black; " +
3556 "background-color: white; " +
3557 "text-align: center;";
3559 var styleSheetElement
= document
.createElement("style");
3560 styleSheetElement
.type
= "text/css";
3561 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3563 // Find the first style sheet that we can access.
3564 // We may not add a rule to a style sheet from another domain for security
3565 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3566 // adds its own style sheets from google.com.
3567 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3568 if (document
.styleSheets
[i
].disabled
) continue;
3569 var mysheet
= document
.styleSheets
[i
];
3571 if (mysheet
.insertRule
) { // Firefox
3572 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3573 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3574 } else if (mysheet
.addRule
) { // IE
3575 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3577 Dygraph
.addedAnnotationCSS
= true;
3580 // Was likely a security exception.
3584 this.warn("Unable to add default annotation CSS rule; display may be off.");
3587 // Older pages may still use this name.
3588 var DateGraph
= Dygraph
;