3 * Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
8 * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
9 * string. Dygraph can handle multiple series with or without error bars. The
10 * date/value ranges will be automatically set. Dygraph uses the
11 * <canvas> tag, so it only works in FF1.5+.
12 * @author danvdk@gmail.com (Dan Vanderkam)
15 <div id="graphdiv" style="width:800px; height:500px;"></div>
16 <script type="text/javascript">
17 new Dygraph(document.getElementById("graphdiv"),
18 "datafile.csv", // CSV file with headers
22 The CSV file is of the form
24 Date,SeriesA,SeriesB,SeriesC
28 If the 'errorBars' option is set in the constructor, the input should be of
30 Date,SeriesA,SeriesB,...
31 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
32 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
34 If the 'fractions' option is set, the input should be of the form:
36 Date,SeriesA,SeriesB,...
37 YYYYMMDD,A1/B1,A2/B2,...
38 YYYYMMDD,A1/B1,A2/B2,...
40 And error bars will be calculated automatically using a binomial distribution.
42 For further documentation and examples, see http://dygraphs.com/
46 /*jshint globalstrict: true */
47 /*global DygraphRangeSelector:false, DygraphLayout:false, DygraphCanvasRenderer:false, G_vmlCanvasManager:false */
51 * Creates an interactive, zoomable chart.
54 * @param {div | String} div A div or the id of a div into which to construct
56 * @param {String | Function} file A file containing CSV data or a function
57 * that returns this data. The most basic expected format for each line is
58 * "YYYY/MM/DD,val1,val2,...". For more information, see
59 * http://dygraphs.com/data.html.
60 * @param {Object} attrs Various other attributes, e.g. errorBars determines
61 * whether the input data contains error ranges. For a complete list of
62 * options, see http://dygraphs.com/options.html.
64 var Dygraph
= function(div
, data
, opts
) {
65 if (arguments
.length
> 0) {
66 if (arguments
.length
== 4) {
67 // Old versions of dygraphs took in the series labels as a constructor
68 // parameter. This doesn't make sense anymore, but it's easy to continue
69 // to support this usage.
70 this.warn("Using deprecated four-argument dygraph constructor");
71 this.__old_init__(div
, data
, arguments
[2], arguments
[3]);
73 this.__init__(div
, data
, opts
);
78 Dygraph
.NAME
= "Dygraph";
79 Dygraph
.VERSION
= "1.2";
80 Dygraph
.__repr__
= function() {
81 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
85 * Returns information about the Dygraph class.
87 Dygraph
.toString
= function() {
88 return this.__repr__();
91 // Various default values
92 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
93 Dygraph
.DEFAULT_WIDTH
= 480;
94 Dygraph
.DEFAULT_HEIGHT
= 320;
96 Dygraph
.ANIMATION_STEPS
= 10;
97 Dygraph
.ANIMATION_DURATION
= 200;
99 // These are defined before DEFAULT_ATTRS so that it can refer to them.
102 * Return a string version of a number. This respects the digitsAfterDecimal
103 * and maxNumberWidth options.
104 * @param {Number} x The number to be formatted
105 * @param {Dygraph} opts An options view
106 * @param {String} name The name of the point's data series
107 * @param {Dygraph} g The dygraph object
109 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
110 var sigFigs
= opts('sigFigs');
112 if (sigFigs
!== null) {
113 // User has opted for a fixed number of significant figures.
114 return Dygraph
.floatFormat(x
, sigFigs
);
117 var digits
= opts('digitsAfterDecimal');
118 var maxNumberWidth
= opts('maxNumberWidth');
120 // switch to scientific notation if we underflow or overflow fixed display.
122 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
123 Math
.abs(x
) < Math
.pow(10, -digits
))) {
124 return x
.toExponential(digits
);
126 return '' + Dygraph
.round_(x
, digits
);
131 * variant for use as an axisLabelFormatter.
134 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
135 return Dygraph
.numberValueFormatter(x
, opts
, g
);
139 * Convert a JS date (millis since epoch) to YYYY/MM/DD
140 * @param {Number} date The JavaScript date (ms since epoch)
141 * @return {String} A date of the form "YYYY/MM/DD"
144 Dygraph
.dateString_
= function(date
) {
145 var zeropad
= Dygraph
.zeropad
;
146 var d
= new Date(date
);
149 var year
= "" + d
.getFullYear();
150 // Get a 0 padded month string
151 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
152 // Get a 0 padded day string
153 var day
= zeropad(d
.getDate());
156 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
157 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
159 return year
+ "/" + month + "/" + day
+ ret
;
163 * Convert a JS date to a string appropriate to display on an axis that
164 * is displaying values at the stated granularity.
165 * @param {Date} date The date to format
166 * @param {Number} granularity One of the Dygraph granularity constants
167 * @return {String} The formatted date
170 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
171 if (granularity
>= Dygraph
.DECADAL
) {
172 return date
.strftime('%Y');
173 } else if (granularity
>= Dygraph
.MONTHLY
) {
174 return date
.strftime('%b %y');
176 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
177 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
178 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
180 return Dygraph
.hmsString_(date
.getTime());
186 // Default attribute values.
187 Dygraph
.DEFAULT_ATTRS
= {
188 highlightCircleSize
: 3,
189 highlightSeriesOpts
: null,
190 highlightSeriesBackgroundFade
: 0,
191 highlightSeriesAnimated
: false,
195 // TODO(danvk): move defaults from createStatusMessage_ here.
197 labelsSeparateLines
: false,
198 labelsShowZeroValues
: true,
201 showLabelsOnHighlight
: true,
203 digitsAfterDecimal
: 2,
208 strokeBorderWidth
: 0,
209 strokeBorderColor
: "white",
212 axisLabelFontSize
: 14,
218 xValueParser
: Dygraph
.dateParser
,
225 wilsonInterval
: true, // only relevant if fractions is true
229 connectSeparatedPoints
: false,
232 hideOverlayOnMouseOut
: true,
234 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
235 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
240 // Sizes of the various chart labels.
247 axisLineColor
: "black",
250 axisLabelColor
: "black",
251 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
255 gridLineColor
: "rgb(128,128,128)",
257 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
258 animatedZooms
: false, // (for now)
260 // Range selector options
261 showRangeSelector
: false,
262 rangeSelectorHeight
: 40,
263 rangeSelectorPlotStrokeColor
: "#808FAB",
264 rangeSelectorPlotFillColor
: "#A7B1C4",
270 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
271 valueFormatter
: Dygraph
.dateString_
,
272 ticker
: null // will be set in dygraph-tickers.js
276 valueFormatter
: Dygraph
.numberValueFormatter
,
277 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
278 ticker
: null // will be set in dygraph-tickers.js
282 valueFormatter
: Dygraph
.numberValueFormatter
,
283 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
284 ticker
: null // will be set in dygraph-tickers.js
289 // Directions for panning and zooming. Use bit operations when combined
290 // values are possible.
291 Dygraph
.HORIZONTAL
= 1;
292 Dygraph
.VERTICAL
= 2;
294 // Used for initializing annotation CSS rules only once.
295 Dygraph
.addedAnnotationCSS
= false;
297 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
298 // Labels is no longer a constructor parameter, since it's typically set
299 // directly from the data source. It also conains a name for the x-axis,
300 // which the previous constructor form did not.
301 if (labels
!== null) {
302 var new_labels
= ["Date"];
303 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
304 Dygraph
.update(attrs
, { 'labels': new_labels
});
306 this.__init__(div
, file
, attrs
);
310 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
311 * and context <canvas> inside of it. See the constructor for details.
313 * @param {Element} div the Element to render the graph into.
314 * @param {String | Function} file Source data
315 * @param {Object} attrs Miscellaneous other options
318 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
319 // Hack for IE: if we're using excanvas and the document hasn't finished
320 // loading yet (and hence may not have initialized whatever it needs to
321 // initialize), then keep calling this routine periodically until it has.
322 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
323 typeof(G_vmlCanvasManager
) != 'undefined' &&
324 document
.readyState
!= 'complete') {
326 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
330 // Support two-argument constructor
331 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
333 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
336 Dygraph
.error("Constructing dygraph with a non-existent div!");
340 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
342 // Copy the important bits into the object
343 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
346 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
347 this.previousVerticalX_
= -1;
348 this.fractions_
= attrs
.fractions
|| false;
349 this.dateWindow_
= attrs
.dateWindow
|| null;
351 this.is_initial_draw_
= true;
352 this.annotations_
= [];
354 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
355 this.zoomed_x_
= false;
356 this.zoomed_y_
= false;
358 // Clear the div. This ensure that, if multiple dygraphs are passed the same
359 // div, then only one will be drawn.
362 // For historical reasons, the 'width' and 'height' options trump all CSS
363 // rules _except_ for an explicit 'width' or 'height' on the div.
364 // As an added convenience, if the div has zero height (like <div></div> does
365 // without any styles), then we use a default height/width
.
366 if (div
.style
.width
=== '' && attrs
.width
) {
367 div
.style
.width
= attrs
.width
+ "px";
369 if (div
.style
.height
=== '' && attrs
.height
) {
370 div
.style
.height
= attrs
.height
+ "px";
372 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
373 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
374 if (div
.style
.width
=== '') {
375 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
378 // these will be zero if the dygraph's div is hidden.
379 this.width_
= div
.clientWidth
;
380 this.height_
= div
.clientHeight
;
382 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
383 if (attrs
.stackedGraph
) {
384 attrs
.fillGraph
= true;
385 // TODO(nikhilk): Add any other stackedGraph checks here.
388 // Dygraphs has many options, some of which interact with one another.
389 // To keep track of everything, we maintain two sets of options:
391 // this.user_attrs_ only options explicitly set by the user.
392 // this.attrs_ defaults, options derived from user_attrs_, data.
394 // Options are then accessed this.attr_('attr'), which first looks at
395 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
396 // defaults without overriding behavior that the user specifically asks for.
397 this.user_attrs_
= {};
398 Dygraph
.update(this.user_attrs_
, attrs
);
400 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
402 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
404 this.boundaryIds_
= [];
405 this.setIndexByName_
= {};
406 this.datasetIndex_
= [];
408 // Create the containing DIV and other interactive elements
409 this.createInterface_();
415 * Returns the zoomed status of the chart for one or both axes.
417 * Axis is an optional parameter. Can be set to 'x' or 'y'.
419 * The zoomed status for an axis is set whenever a user zooms using the mouse
420 * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom
421 * option is also specified).
423 Dygraph
.prototype.isZoomed
= function(axis
) {
424 if (axis
== null) return this.zoomed_x_
|| this.zoomed_y_
;
425 if (axis
=== 'x') return this.zoomed_x_
;
426 if (axis
=== 'y') return this.zoomed_y_
;
427 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
431 * Returns information about the Dygraph object, including its containing ID.
433 Dygraph
.prototype.toString
= function() {
434 var maindiv
= this.maindiv_
;
435 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
436 return "[Dygraph " + id
+ "]";
441 * Returns the value of an option. This may be set by the user (either in the
442 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
444 * @param { String } name The name of the option, e.g. 'rollPeriod'.
445 * @param { String } [seriesName] The name of the series to which the option
446 * will be applied. If no per-series value of this option is available, then
447 * the global value is returned. This is optional.
448 * @return { ... } The value of the option.
450 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
451 // <REMOVE_FOR_COMBINED>
452 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
453 this.error('Must include options reference JS for testing');
454 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
455 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
456 'in the Dygraphs.OPTIONS_REFERENCE listing.');
457 // Only log this error once.
458 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
460 // </REMOVE_FOR_COMBINED
>
463 sources
.push(this.attrs_
);
464 if (this.user_attrs_
) {
465 sources
.push(this.user_attrs_
);
467 if (this.user_attrs_
.hasOwnProperty(seriesName
)) {
468 sources
.push(this.user_attrs_
[seriesName
]);
470 if (seriesName
=== this.highlightSet_
&&
471 this.user_attrs_
.hasOwnProperty('highlightSeriesOpts')) {
472 sources
.push(this.user_attrs_
['highlightSeriesOpts']);
478 for (var i
= sources
.length
- 1; i
>= 0; --i
) {
479 var source
= sources
[i
];
480 if (source
.hasOwnProperty(name
)) {
490 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
491 * @return { ... } A function mapping string -> option value
493 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
495 return function(opt
) {
496 var axis_opts
= self
.user_attrs_
.axes
;
497 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
498 return axis_opts
[axis
][opt
];
500 // user-specified attributes always trump defaults, even if they're less
502 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
503 return self
.user_attrs_
[opt
];
506 axis_opts
= self
.attrs_
.axes
;
507 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
508 return axis_opts
[axis
][opt
];
510 // check old-style axis options
511 // TODO(danvk): add a deprecation warning if either of these match.
512 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
513 return self
.axes_
[0][opt
];
514 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
515 return self
.axes_
[1][opt
];
517 return self
.attr_(opt
);
522 * Returns the current rolling period, as set by the user or an option.
523 * @return {Number} The number of points in the rolling window
525 Dygraph
.prototype.rollPeriod
= function() {
526 return this.rollPeriod_
;
530 * Returns the currently-visible x-range. This can be affected by zooming,
531 * panning or a call to updateOptions.
532 * Returns a two-element array: [left, right].
533 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
535 Dygraph
.prototype.xAxisRange
= function() {
536 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
540 * Returns the lower- and upper-bound x-axis values of the
543 Dygraph
.prototype.xAxisExtremes
= function() {
544 var left
= this.rawData_
[0][0];
545 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
546 return [left
, right
];
550 * Returns the currently-visible y-range for an axis. This can be affected by
551 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
552 * called with no arguments, returns the range of the first axis.
553 * Returns a two-element array: [bottom, top].
555 Dygraph
.prototype.yAxisRange
= function(idx
) {
556 if (typeof(idx
) == "undefined") idx
= 0;
557 if (idx
< 0 || idx
>= this.axes_
.length
) {
560 var axis
= this.axes_
[idx
];
561 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
565 * Returns the currently-visible y-ranges for each axis. This can be affected by
566 * zooming, panning, calls to updateOptions, etc.
567 * Returns an array of [bottom, top] pairs, one for each y-axis.
569 Dygraph
.prototype.yAxisRanges
= function() {
571 for (var i
= 0; i
< this.axes_
.length
; i
++) {
572 ret
.push(this.yAxisRange(i
));
577 // TODO(danvk): use these functions throughout dygraphs.
579 * Convert from data coordinates to canvas/div X/Y coordinates.
580 * If specified, do this conversion for the coordinate system of a particular
581 * axis. Uses the first axis by default.
582 * Returns a two-element array: [X, Y]
584 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
585 * instead of toDomCoords(null, y, axis).
587 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
588 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
592 * Convert from data x coordinates to canvas/div X coordinate.
593 * If specified, do this conversion for the coordinate system of a particular
595 * Returns a single value or null if x is null.
597 Dygraph
.prototype.toDomXCoord
= function(x
) {
602 var area
= this.plotter_
.area
;
603 var xRange
= this.xAxisRange();
604 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
608 * Convert from data x coordinates to canvas/div Y coordinate and optional
609 * axis. Uses the first axis by default.
611 * returns a single value or null if y is null.
613 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
614 var pct
= this.toPercentYCoord(y
, axis
);
619 var area
= this.plotter_
.area
;
620 return area
.y
+ pct
* area
.h
;
624 * Convert from canvas/div coords to data coordinates.
625 * If specified, do this conversion for the coordinate system of a particular
626 * axis. Uses the first axis by default.
627 * Returns a two-element array: [X, Y].
629 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
630 * instead of toDataCoords(null, y, axis).
632 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
633 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
637 * Convert from canvas/div x coordinate to data coordinate.
639 * If x is null, this returns null.
641 Dygraph
.prototype.toDataXCoord
= function(x
) {
646 var area
= this.plotter_
.area
;
647 var xRange
= this.xAxisRange();
648 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
652 * Convert from canvas/div y coord to value.
654 * If y is null, this returns null.
655 * if axis is null, this uses the first axis.
657 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
662 var area
= this.plotter_
.area
;
663 var yRange
= this.yAxisRange(axis
);
665 if (typeof(axis
) == "undefined") axis
= 0;
666 if (!this.axes_
[axis
].logscale
) {
667 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
669 // Computing the inverse of toDomCoord.
670 var pct
= (y
- area
.y
) / area
.h
;
672 // Computing the inverse of toPercentYCoord. The function was arrived at with
673 // the following steps:
675 // Original calcuation:
676 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
678 // Move denominator to both sides:
679 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
681 // subtract logr1, and take the negative value.
682 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
684 // Swap both sides of the equation, and we can compute the log of the
685 // return value. Which means we just need to use that as the exponent in
687 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
689 var logr1
= Dygraph
.log10(yRange
[1]);
690 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
691 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
697 * Converts a y for an axis to a percentage from the top to the
698 * bottom of the drawing area.
700 * If the coordinate represents a value visible on the canvas, then
701 * the value will be between 0 and 1, where 0 is the top of the canvas.
702 * However, this method will return values outside the range, as
703 * values can fall outside the canvas.
705 * If y is null, this returns null.
706 * if axis is null, this uses the first axis.
708 * @param { Number } y The data y-coordinate.
709 * @param { Number } [axis] The axis number on which the data coordinate lives.
710 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
712 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
716 if (typeof(axis
) == "undefined") axis
= 0;
718 var yRange
= this.yAxisRange(axis
);
721 if (!this.axes_
[axis
].logscale
) {
722 // yRange[1] - y is unit distance from the bottom.
723 // yRange[1] - yRange[0] is the scale of the range.
724 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
725 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
727 var logr1
= Dygraph
.log10(yRange
[1]);
728 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
734 * Converts an x value to a percentage from the left to the right of
737 * If the coordinate represents a value visible on the canvas, then
738 * the value will be between 0 and 1, where 0 is the left of the canvas.
739 * However, this method will return values outside the range, as
740 * values can fall outside the canvas.
742 * If x is null, this returns null.
743 * @param { Number } x The data x-coordinate.
744 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
746 Dygraph
.prototype.toPercentXCoord
= function(x
) {
751 var xRange
= this.xAxisRange();
752 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
756 * Returns the number of columns (including the independent variable).
757 * @return { Integer } The number of columns.
759 Dygraph
.prototype.numColumns
= function() {
760 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
764 * Returns the number of rows (excluding any header/label row).
765 * @return { Integer } The number of rows, less any header.
767 Dygraph
.prototype.numRows
= function() {
768 return this.rawData_
.length
;
772 * Returns the full range of the x-axis, as determined by the most extreme
773 * values in the data set. Not affected by zooming, visibility, etc.
774 * TODO(danvk): merge w/ xAxisExtremes
775 * @return { Array<Number> } A [low, high] pair
778 Dygraph
.prototype.fullXRange_
= function() {
779 if (this.numRows() > 0) {
780 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
787 * Returns the value in the given row and column. If the row and column exceed
788 * the bounds on the data, returns null. Also returns null if the value is
790 * @param { Number} row The row number of the data (0-based). Row 0 is the
791 * first row of data, not a header row.
792 * @param { Number} col The column number of the data (0-based)
793 * @return { Number } The value in the specified cell or null if the row/col
796 Dygraph
.prototype.getValue
= function(row
, col
) {
797 if (row
< 0 || row
> this.rawData_
.length
) return null;
798 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
800 return this.rawData_
[row
][col
];
804 * Generates interface elements for the Dygraph: a containing div, a div to
805 * display the current point, and a textbox to adjust the rolling average
806 * period. Also creates the Renderer/Layout elements.
809 Dygraph
.prototype.createInterface_
= function() {
810 // Create the all-enclosing graph div
811 var enclosing
= this.maindiv_
;
813 this.graphDiv
= document
.createElement("div");
814 this.graphDiv
.style
.width
= this.width_
+ "px";
815 this.graphDiv
.style
.height
= this.height_
+ "px";
816 enclosing
.appendChild(this.graphDiv
);
818 // Create the canvas for interactive parts of the chart.
819 this.canvas_
= Dygraph
.createCanvas();
820 this.canvas_
.style
.position
= "absolute";
821 this.canvas_
.width
= this.width_
;
822 this.canvas_
.height
= this.height_
;
823 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
824 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
826 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
828 // ... and for static parts of the chart.
829 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
830 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
832 if (this.attr_('showRangeSelector')) {
833 // The range selector must be created here so that its canvases and contexts get created here.
834 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
835 // The range selector also sets xAxisHeight in order to reserve space.
836 this.rangeSelector_
= new DygraphRangeSelector(this);
839 // The interactive parts of the graph are drawn on top of the chart.
840 this.graphDiv
.appendChild(this.hidden_
);
841 this.graphDiv
.appendChild(this.canvas_
);
842 this.mouseEventElement_
= this.createMouseEventElement_();
844 // Create the grapher
845 this.layout_
= new DygraphLayout(this);
847 if (this.rangeSelector_
) {
848 // This needs to happen after the graph canvases are added to the div and the layout object is created.
849 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
854 this.mouseMoveHandler
= function(e
) {
855 dygraph
.mouseMove_(e
);
857 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
859 this.mouseOutHandler
= function(e
) {
860 dygraph
.mouseOut_(e
);
862 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
864 this.createStatusMessage_();
865 this.createDragInterface_();
867 this.resizeHandler
= function(e
) {
871 // Update when the window is resized.
872 // TODO(danvk): drop frames depending on complexity of the chart.
873 Dygraph
.addEvent(window
, 'resize', this.resizeHandler
);
877 * Detach DOM elements in the dygraph and null out all data references.
878 * Calling this when you're done with a dygraph can dramatically reduce memory
879 * usage. See, e.g., the tests/perf.html example.
881 Dygraph
.prototype.destroy
= function() {
882 var removeRecursive
= function(node
) {
883 while (node
.hasChildNodes()) {
884 removeRecursive(node
.firstChild
);
885 node
.removeChild(node
.firstChild
);
889 // remove mouse event handlers
890 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
891 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
892 removeRecursive(this.maindiv_
);
894 var nullOut
= function(obj
) {
896 if (typeof(obj
[n
]) === 'object') {
901 // remove event handlers
902 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
903 this.resizeHandler
= null;
904 // These may not all be necessary, but it can't hurt...
905 nullOut(this.layout_
);
906 nullOut(this.plotter_
);
911 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
912 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
913 * or the zoom rectangles) is done on this.canvas_.
914 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
915 * @return {Object} The newly-created canvas
918 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
919 var h
= Dygraph
.createCanvas();
920 h
.style
.position
= "absolute";
921 // TODO(danvk): h should be offset from canvas. canvas needs to include
922 // some extra area to make it easier to zoom in on the far left and far
923 // right. h needs to be precisely the plot area, so that clipping occurs.
924 h
.style
.top
= canvas
.style
.top
;
925 h
.style
.left
= canvas
.style
.left
;
926 h
.width
= this.width_
;
927 h
.height
= this.height_
;
928 h
.style
.width
= this.width_
+ "px"; // for IE
929 h
.style
.height
= this.height_
+ "px"; // for IE
934 * Creates an overlay element used to handle mouse events.
935 * @return {Object} The mouse event element.
938 Dygraph
.prototype.createMouseEventElement_
= function() {
939 if (this.isUsingExcanvas_
) {
940 var elem
= document
.createElement("div");
941 elem
.style
.position
= 'absolute';
942 elem
.style
.backgroundColor
= 'white';
943 elem
.style
.filter
= 'alpha(opacity=0)';
944 elem
.style
.width
= this.width_
+ "px";
945 elem
.style
.height
= this.height_
+ "px";
946 this.graphDiv
.appendChild(elem
);
954 * Generate a set of distinct colors for the data series. This is done with a
955 * color wheel. Saturation/Value are customizable, and the hue is
956 * equally-spaced around the color wheel. If a custom set of colors is
957 * specified, that is used instead.
960 Dygraph
.prototype.setColors_
= function() {
961 var num
= this.attr_("labels").length
- 1;
963 var colors
= this.attr_('colors');
966 var sat
= this.attr_('colorSaturation') || 1.0;
967 var val
= this.attr_('colorValue') || 0.5;
968 var half
= Math
.ceil(num
/ 2);
969 for (i
= 1; i
<= num
; i
++) {
970 if (!this.visibility()[i
-1]) continue;
971 // alternate colors for high contrast.
972 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
973 var hue
= (1.0 * idx
/ (1 + num
));
974 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
977 for (i
= 0; i
< num
; i
++) {
978 if (!this.visibility()[i
]) continue;
979 var colorStr
= colors
[i
% colors
.length
];
980 this.colors_
.push(colorStr
);
984 this.plotter_
.setColors(this.colors_
);
988 * Return the list of colors. This is either the list of colors passed in the
989 * attributes or the autogenerated list of rgb(r,g,b) strings.
990 * @return {Array<string>} The list of colors.
992 Dygraph
.prototype.getColors
= function() {
997 * Create the div that contains information on the selected point(s)
998 * This goes in the top right of the canvas, unless an external div has already
1002 Dygraph
.prototype.createStatusMessage_
= function() {
1003 var userLabelsDiv
= this.user_attrs_
.labelsDiv
;
1004 if (userLabelsDiv
&& null !== userLabelsDiv
&&
1005 (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
1006 this.user_attrs_
.labelsDiv
= document
.getElementById(userLabelsDiv
);
1008 if (!this.attr_("labelsDiv")) {
1009 var divWidth
= this.attr_('labelsDivWidth');
1010 var messagestyle
= {
1011 "position": "absolute",
1014 "width": divWidth
+ "px",
1016 "left": (this.width_
- divWidth
- 2) + "px",
1017 "background": "white",
1018 "textAlign": "left",
1019 "overflow": "hidden"};
1020 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
1021 var div
= document
.createElement("div");
1022 div
.className
= "dygraph-legend";
1023 for (var name
in messagestyle
) {
1024 if (messagestyle
.hasOwnProperty(name
)) {
1025 div
.style
[name
] = messagestyle
[name
];
1028 this.graphDiv
.appendChild(div
);
1029 this.attrs_
.labelsDiv
= div
;
1034 * Position the labels div so that:
1035 * - its right edge is flush with the right edge of the charting area
1036 * - its top edge is flush with the top edge of the charting area
1039 Dygraph
.prototype.positionLabelsDiv_
= function() {
1040 // Don't touch a user-specified labelsDiv.
1041 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
1043 var area
= this.plotter_
.area
;
1044 var div
= this.attr_("labelsDiv");
1045 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
1046 div
.style
.top
= area
.y
+ "px";
1050 * Create the text box to adjust the averaging period
1053 Dygraph
.prototype.createRollInterface_
= function() {
1054 // Create a roller if one doesn't exist already.
1055 if (!this.roller_
) {
1056 this.roller_
= document
.createElement("input");
1057 this.roller_
.type
= "text";
1058 this.roller_
.style
.display
= "none";
1059 this.graphDiv
.appendChild(this.roller_
);
1062 var display
= this.attr_('showRoller') ? 'block' : 'none';
1064 var area
= this.plotter_
.area
;
1065 var textAttr
= { "position": "absolute",
1067 "top": (area
.y
+ area
.h
- 25) + "px",
1068 "left": (area
.x
+ 1) + "px",
1071 this.roller_
.size
= "2";
1072 this.roller_
.value
= this.rollPeriod_
;
1073 for (var name
in textAttr
) {
1074 if (textAttr
.hasOwnProperty(name
)) {
1075 this.roller_
.style
[name
] = textAttr
[name
];
1080 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1085 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1086 * canvas (i.e. DOM Coords).
1088 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1089 return Dygraph
.pageX(e
) - context
.px
;
1094 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1095 * canvas (i.e. DOM Coords).
1097 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1098 return Dygraph
.pageY(e
) - context
.py
;
1102 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1106 Dygraph
.prototype.createDragInterface_
= function() {
1108 // Tracks whether the mouse is down right now
1110 isPanning
: false, // is this drag part of a pan?
1111 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1112 dragStartX
: null, // pixel coordinates
1113 dragStartY
: null, // pixel coordinates
1114 dragEndX
: null, // pixel coordinates
1115 dragEndY
: null, // pixel coordinates
1116 dragDirection
: null,
1117 prevEndX
: null, // pixel coordinates
1118 prevEndY
: null, // pixel coordinates
1119 prevDragDirection
: null,
1121 // The value on the left side of the graph when a pan operation starts.
1122 initialLeftmostDate
: null,
1124 // The number of units each pixel spans. (This won't be valid for log
1126 xUnitsPerPixel
: null,
1128 // TODO(danvk): update this comment
1129 // The range in second/value units that the viewport encompasses during a
1130 // panning operation.
1133 // Top-left corner of the canvas, in DOM coords
1134 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1138 // Values for use with panEdgeFraction, which limit how far outside the
1139 // graph's data boundaries it can be panned.
1140 boundedDates
: null, // [minDate, maxDate]
1141 boundedValues
: null, // [[minValue, maxValue] ...]
1143 initializeMouseDown
: function(event
, g
, context
) {
1144 // prevents mouse drags from selecting page text.
1145 if (event
.preventDefault
) {
1146 event
.preventDefault(); // Firefox, Chrome, etc.
1148 event
.returnValue
= false; // IE
1149 event
.cancelBubble
= true;
1152 context
.px
= Dygraph
.findPosX(g
.canvas_
);
1153 context
.py
= Dygraph
.findPosY(g
.canvas_
);
1154 context
.dragStartX
= g
.dragGetX_(event
, context
);
1155 context
.dragStartY
= g
.dragGetY_(event
, context
);
1159 var interactionModel
= this.attr_("interactionModel");
1161 // Self is the graph.
1164 // Function that binds the graph and context to the handler.
1165 var bindHandler
= function(handler
) {
1166 return function(event
) {
1167 handler(event
, self
, context
);
1171 for (var eventName
in interactionModel
) {
1172 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1173 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
1174 bindHandler(interactionModel
[eventName
]));
1177 // If the user releases the mouse button during a drag, but not over the
1178 // canvas, then it doesn't count as a zooming action.
1179 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
1180 if (context
.isZooming
|| context
.isPanning
) {
1181 context
.isZooming
= false;
1182 context
.dragStartX
= null;
1183 context
.dragStartY
= null;
1186 if (context
.isPanning
) {
1187 context
.isPanning
= false;
1188 context
.draggingDate
= null;
1189 context
.dateRange
= null;
1190 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1191 delete self
.axes_
[i
].draggingValue
;
1192 delete self
.axes_
[i
].dragValueRange
;
1199 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1200 * up any previous zoom rectangles that were drawn. This could be optimized to
1201 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1204 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1205 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1206 * @param {Number} startX The X position where the drag started, in canvas
1208 * @param {Number} endX The current X position of the drag, in canvas coords.
1209 * @param {Number} startY The Y position where the drag started, in canvas
1211 * @param {Number} endY The current Y position of the drag, in canvas coords.
1212 * @param {Number} prevDirection the value of direction on the previous call to
1213 * this function. Used to avoid excess redrawing
1214 * @param {Number} prevEndX The value of endX on the previous call to this
1215 * function. Used to avoid excess redrawing
1216 * @param {Number} prevEndY The value of endY on the previous call to this
1217 * function. Used to avoid excess redrawing
1220 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1221 endY
, prevDirection
, prevEndX
,
1223 var ctx
= this.canvas_ctx_
;
1225 // Clean up from the previous rect if necessary
1226 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1227 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1228 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1229 } else if (prevDirection
== Dygraph
.VERTICAL
){
1230 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1231 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1234 // Draw a light-grey rectangle to show the new viewing area
1235 if (direction
== Dygraph
.HORIZONTAL
) {
1236 if (endX
&& startX
) {
1237 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1238 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1239 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1241 } else if (direction
== Dygraph
.VERTICAL
) {
1242 if (endY
&& startY
) {
1243 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1244 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1245 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1249 if (this.isUsingExcanvas_
) {
1250 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1255 * Clear the zoom rectangle (and perform no zoom).
1258 Dygraph
.prototype.clearZoomRect_
= function() {
1259 this.currentZoomRectArgs_
= null;
1260 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1264 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1265 * the canvas. The exact zoom window may be slightly larger if there are no data
1266 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1267 * which accepts dates that match the raw data. This function redraws the graph.
1269 * @param {Number} lowX The leftmost pixel value that should be visible.
1270 * @param {Number} highX The rightmost pixel value that should be visible.
1273 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1274 this.currentZoomRectArgs_
= null;
1275 // Find the earliest and latest dates contained in this canvasx range.
1276 // Convert the call to date ranges of the raw data.
1277 var minDate
= this.toDataXCoord(lowX
);
1278 var maxDate
= this.toDataXCoord(highX
);
1279 this.doZoomXDates_(minDate
, maxDate
);
1283 * Transition function to use in animations. Returns values between 0.0
1284 * (totally old values) and 1.0 (totally new values) for each frame.
1287 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1289 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1293 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1294 * method with doZoomX which accepts pixel coordinates. This function redraws
1297 * @param {Number} minDate The minimum date that should be visible.
1298 * @param {Number} maxDate The maximum date that should be visible.
1301 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1302 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1303 // can produce strange effects. Rather than the y-axis transitioning slowly
1304 // between values, it can jerk around.)
1305 var old_window
= this.xAxisRange();
1306 var new_window
= [minDate
, maxDate
];
1307 this.zoomed_x_
= true;
1309 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1310 if (that
.attr_("zoomCallback")) {
1311 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1317 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1318 * the canvas. This function redraws the graph.
1320 * @param {Number} lowY The topmost pixel value that should be visible.
1321 * @param {Number} highY The lowest pixel value that should be visible.
1324 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1325 this.currentZoomRectArgs_
= null;
1326 // Find the highest and lowest values in pixel range for each axis.
1327 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1328 // This is because pixels increase as you go down on the screen, whereas data
1329 // coordinates increase as you go up the screen.
1330 var oldValueRanges
= this.yAxisRanges();
1331 var newValueRanges
= [];
1332 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1333 var hi
= this.toDataYCoord(lowY
, i
);
1334 var low
= this.toDataYCoord(highY
, i
);
1335 newValueRanges
.push([low
, hi
]);
1338 this.zoomed_y_
= true;
1340 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1341 if (that
.attr_("zoomCallback")) {
1342 var xRange
= that
.xAxisRange();
1343 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1349 * Reset the zoom to the original view coordinates. This is the same as
1350 * double-clicking on the graph.
1354 Dygraph
.prototype.doUnzoom_
= function() {
1355 var dirty
= false, dirtyX
= false, dirtyY
= false;
1356 if (this.dateWindow_
!== null) {
1361 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1362 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1368 // Clear any selection, since it's likely to be drawn in the wrong place.
1369 this.clearSelection();
1372 this.zoomed_x_
= false;
1373 this.zoomed_y_
= false;
1375 var minDate
= this.rawData_
[0][0];
1376 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1378 // With only one frame, don't bother calculating extreme ranges.
1379 // TODO(danvk): merge this block w/ the code below
.
1380 if (!this.attr_("animatedZooms")) {
1381 this.dateWindow_
= null;
1382 for (i
= 0; i
< this.axes_
.length
; i
++) {
1383 if (this.axes_
[i
].valueWindow
!== null) {
1384 delete this.axes_
[i
].valueWindow
;
1388 if (this.attr_("zoomCallback")) {
1389 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1394 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1396 oldWindow
= this.xAxisRange();
1397 newWindow
= [minDate
, maxDate
];
1401 oldValueRanges
= this.yAxisRanges();
1402 // TODO(danvk): this is pretty inefficient
1403 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1404 var extremes
= packed
[1];
1406 // this has the side-effect of modifying this.axes_.
1407 // this doesn't make much sense in this context, but it's convenient (we
1408 // need this.axes_[*].extremeValues) and not harmful since we'll be
1409 // calling drawGraph_ shortly, which clobbers these values.
1410 this.computeYAxisRanges_(extremes
);
1412 newValueRanges
= [];
1413 for (i
= 0; i
< this.axes_
.length
; i
++) {
1414 var axis
= this.axes_
[i
];
1415 newValueRanges
.push(axis
.valueRange
!= null ? axis
.valueRange
: axis
.extremeRange
);
1420 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1422 that
.dateWindow_
= null;
1423 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1424 if (that
.axes_
[i
].valueWindow
!== null) {
1425 delete that
.axes_
[i
].valueWindow
;
1428 if (that
.attr_("zoomCallback")) {
1429 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1436 * Combined animation logic for all zoom functions.
1437 * either the x parameters or y parameters may be null.
1440 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1441 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1444 var valueRanges
= [];
1447 if (oldXRange
!== null && newXRange
!== null) {
1448 for (step
= 1; step
<= steps
; step
++) {
1449 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1450 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1451 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1455 if (oldYRanges
!== null && newYRanges
!== null) {
1456 for (step
= 1; step
<= steps
; step
++) {
1457 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1459 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1460 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1461 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1463 valueRanges
[step
-1] = thisRange
;
1468 Dygraph
.repeatAndCleanup(function(step
) {
1469 if (valueRanges
.length
) {
1470 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1471 var w
= valueRanges
[step
][i
];
1472 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1475 if (windows
.length
) {
1476 that
.dateWindow_
= windows
[step
];
1479 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1483 * Get the current graph's area object.
1485 * Returns: {x, y, w, h}
1487 Dygraph
.prototype.getArea
= function() {
1488 return this.plotter_
.area
;
1492 * Convert a mouse event to DOM coordinates relative to the graph origin.
1494 * Returns a two-element array: [X, Y].
1496 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1497 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1498 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1499 return [canvasx
, canvasy
];
1503 * Given a canvas X coordinate, find the closest row.
1504 * @param {Number} domX graph-relative DOM X coordinate
1505 * Returns: row number, integer
1508 Dygraph
.prototype.findClosestRow
= function(domX
) {
1509 var minDistX
= null;
1511 var points
= this.layout_
.points
;
1512 var l
= points
.length
;
1513 for (var i
= 0; i
< l
; i
++) {
1514 var point
= points
[i
];
1515 if (point
=== null) continue;
1516 var dist
= Math
.abs(point
.canvasx
- domX
);
1517 if (minDistX
!== null && dist
>= minDistX
) continue;
1521 return this.idxToRow_(idx
);
1525 * Given canvas X,Y coordinates, find the closest point
1526 * @param {Number} domX graph-relative DOM X coordinate
1527 * @param {Number} domY graph-relative DOM Y coordinate
1528 * Returns: {row, seriesName, point}
1531 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1534 var points
= this.layout_
.points
;
1535 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1536 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1537 var first
= this.layout_
.setPointsOffsets
[setIdx
];
1538 var len
= this.layout_
.setPointsLengths
[setIdx
];
1539 for (var i
= 0; i
< len
; ++i
) {
1540 var point
= points
[first
+ i
];
1541 if (point
=== null) continue;
1542 dx
= point
.canvasx
- domX
;
1543 dy
= point
.canvasy
- domY
;
1544 dist
= dx
* dx
+ dy
* dy
;
1545 if (minDist
!== null && dist
>= minDist
) continue;
1547 closestPoint
= point
;
1548 closestSeries
= setIdx
;
1552 var name
= this.layout_
.setNames
[closestSeries
];
1561 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1562 * @param {Number} domX graph-relative DOM X coordinate
1563 * @param {Number} domY graph-relative DOM Y coordinate
1564 * Returns: {row, seriesName, point}
1567 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1568 var row
= this.findClosestRow(domX
);
1569 var points
= this.layout_
.points
;
1570 var closestPoint
, closestSeries
;
1571 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1572 var first
= this.layout_
.setPointsOffsets
[setIdx
];
1573 var len
= this.layout_
.setPointsLengths
[setIdx
];
1574 if (row
>= len
) continue;
1575 var p1
= points
[first
+ row
];
1576 var py
= p1
.canvasy
;
1577 if (domX
> p1
.canvasx
&& row
+ 1 < len
) {
1578 // interpolate series Y value using next point
1579 var p2
= points
[first
+ row
+ 1];
1580 var dx
= p2
.canvasx
- p1
.canvasx
;
1582 var r
= (domX
- p1
.canvasx
) / dx
;
1583 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1585 } else if (domX
< p1
.canvasx
&& row
> 0) {
1586 // interpolate series Y value using previous point
1587 var p0
= points
[first
+ row
- 1];
1588 var dx
= p1
.canvasx
- p0
.canvasx
;
1590 var r
= (p1
.canvasx
- domX
) / dx
;
1591 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1594 // Stop if the point (domX, py) is above this series' upper edge
1595 if (setIdx
> 0 && py
>= domY
) break;
1597 closestSeries
= setIdx
;
1599 var name
= this.layout_
.setNames
[closestSeries
];
1608 * When the mouse moves in the canvas, display information about a nearby data
1609 * point and draw dots over those points in the data series. This function
1610 * takes care of cleanup of previously-drawn dots.
1611 * @param {Object} event The mousemove event from the browser.
1614 Dygraph
.prototype.mouseMove_
= function(event
) {
1615 // This prevents JS errors when mousing over the canvas before data loads.
1616 var points
= this.layout_
.points
;
1617 if (points
=== undefined
) return;
1619 var canvasCoords
= this.eventToDomCoords(event
);
1620 var canvasx
= canvasCoords
[0];
1621 var canvasy
= canvasCoords
[1];
1623 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1624 var selectionChanged
= false;
1625 if (highlightSeriesOpts
) {
1627 if (this.attr_("stackedGraph")) {
1628 closest
= this.findStackedPoint(canvasx
, canvasy
);
1630 closest
= this.findClosestPoint(canvasx
, canvasy
);
1632 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1634 var idx
= this.findClosestRow(canvasx
);
1635 selectionChanged
= this.setSelection(idx
);
1638 var callback
= this.attr_("highlightCallback");
1639 if (callback
&& selectionChanged
) {
1640 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1645 * Transforms layout_.points index into data row number.
1646 * @param int layout_.points index
1647 * @return int row number, or -1 if none could be found.
1650 Dygraph
.prototype.idxToRow_
= function(idx
) {
1651 if (idx
< 0) return -1;
1653 // make sure that you get the boundaryIds record which is also defined (see bug #236)
1654 var boundaryIdx
= -1;
1655 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1656 if (this.boundaryIds_
[i
] !== undefined
) {
1661 if (boundaryIdx
< 0) return -1;
1662 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1663 var set
= this.layout_
.datasets
[setIdx
];
1664 if (idx
< set
.length
) {
1665 return this.boundaryIds_
[boundaryIdx
][0] + idx
;
1674 * Generates legend html dash for any stroke pattern. It will try to scale the
1675 * pattern to fit in 1em width. Or if small enough repeat the partern for 1em
1677 * @param strokePattern The pattern
1678 * @param color The color of the series.
1679 * @param oneEmWidth The width in pixels of 1em in the legend.
1681 Dygraph
.prototype.generateLegendDashHTML_
= function(strokePattern
, color
, oneEmWidth
) {
1683 var i
, j
, paddingLeft
, marginRight
;
1684 var strokePixelLength
= 0, segmentLoop
= 0;
1685 var normalizedPattern
= [];
1687 // IE 7,8 fail at these divs, so they get boring legend, have not tested 9.
1688 var isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
1692 if (!strokePattern
|| strokePattern
.length
<= 1) {
1694 dash
= "<div style=\"display: inline-block; position: relative; " +
1695 "bottom: .5ex; padding-left: 1em; height: 1px; " +
1696 "border-bottom: 2px solid " + color
+ ";\"></div>";
1698 // Compute the length of the pixels including the first segment twice,
1699 // since we repeat it.
1700 for (i
= 0; i
<= strokePattern
.length
; i
++) {
1701 strokePixelLength
+= strokePattern
[i
%strokePattern
.length
];
1704 // See if we can loop the pattern by itself at least twice.
1705 loop
= Math
.floor(oneEmWidth
/(strokePixelLength
-strokePattern
[0]));
1707 // This pattern fits at least two times, no scaling just convert to em;
1708 for (i
= 0; i
< strokePattern
.length
; i
++) {
1709 normalizedPattern
[i
] = strokePattern
[i
]/oneEmWidth
;
1711 // Since we are repeating the pattern, we don't worry about repeating the
1712 // first segment in one draw.
1713 segmentLoop
= normalizedPattern
.length
;
1715 // If the pattern doesn't fit in the legend we scale it to fit.
1717 for (i
= 0; i
< strokePattern
.length
; i
++) {
1718 normalizedPattern
[i
] = strokePattern
[i
]/strokePixelLength
;
1720 // For the scaled patterns we do redraw the first segment.
1721 segmentLoop
= normalizedPattern
.length
+1;
1723 // Now make the pattern.
1724 for (j
= 0; j
< loop
; j
++) {
1725 for (i
= 0; i
< segmentLoop
; i
+=2) {
1726 // The padding is the drawn segment.
1727 paddingLeft
= normalizedPattern
[i
%normalizedPattern
.length
];
1728 if (i
< strokePattern
.length
) {
1729 // The margin is the space segment.
1730 marginRight
= normalizedPattern
[(i
+1)%normalizedPattern
.length
];
1732 // The repeated first segment has no right margin.
1735 dash
+= "<div style=\"display: inline-block; position: relative; " +
1736 "bottom: .5ex; margin-right: " + marginRight
+ "em; padding-left: " +
1737 paddingLeft
+ "em; height: 1px; border-bottom: 2px solid " + color
+
1747 * Generates HTML for the legend which is displayed when hovering over the
1748 * chart. If no selected points are specified, a default legend is returned
1749 * (this may just be the empty string).
1750 * @param { Number } [x] The x-value of the selected points.
1751 * @param { [Object] } [sel_points] List of selected points for the given
1752 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1753 * @param { Number } [oneEmWidth] The pixel width for 1em in the legend.
1755 Dygraph
.prototype.generateLegendHTML_
= function(x
, sel_points
, oneEmWidth
) {
1756 // If no points are selected, we display a default legend. Traditionally,
1757 // this has been blank. But a better default would be a conventional legend,
1758 // which provides essential information for a non-interactive chart.
1759 var html
, sepLines
, i
, c
, dash
, strokePattern
;
1760 if (typeof(x
) === 'undefined') {
1761 if (this.attr_('legend') != 'always') return '';
1763 sepLines
= this.attr_('labelsSeparateLines');
1764 var labels
= this.attr_('labels');
1766 for (i
= 1; i
< labels
.length
; i
++) {
1767 if (!this.visibility()[i
- 1]) continue;
1768 c
= this.plotter_
.colors
[labels
[i
]];
1769 if (html
!== '') html
+= (sepLines
? '<br/>' : ' ');
1770 strokePattern
= this.attr_("strokePattern", labels
[i
]);
1771 dash
= this.generateLegendDashHTML_(strokePattern
, c
, oneEmWidth
);
1772 html
+= "<span style='font-weight: bold; color: " + c
+ ";'>" + dash
+
1773 " " + labels
[i
] + "</span>";
1778 var xOptView
= this.optionsViewForAxis_('x');
1779 var xvf
= xOptView('valueFormatter');
1780 html
= xvf(x
, xOptView
, this.attr_('labels')[0], this) + ":";
1783 var num_axes
= this.numAxes();
1784 for (i
= 0; i
< num_axes
; i
++) {
1785 yOptViews
[i
] = this.optionsViewForAxis_('y' + (i
? 1 + i
: ''));
1787 var showZeros
= this.attr_("labelsShowZeroValues");
1788 sepLines
= this.attr_("labelsSeparateLines");
1789 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1790 var pt
= this.selPoints_
[i
];
1791 if (pt
.yval
=== 0 && !showZeros
) continue;
1792 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1793 if (sepLines
) html
+= "<br/>";
1795 var yOptView
= yOptViews
[this.seriesToAxisMap_
[pt
.name
]];
1796 var fmtFunc
= yOptView('valueFormatter');
1797 c
= this.plotter_
.colors
[pt
.name
];
1798 var yval
= fmtFunc(pt
.yval
, yOptView
, pt
.name
, this);
1800 var cls
= (pt
.name
== this.highlightSet_
) ? " class='highlight'" : "";
1801 // TODO(danvk): use a template string here and make it an attribute.
1802 html
+= "<span" + cls
+ ">" + " <b><span style='color: " + c
+ ";'>" + pt
.name
+
1803 "</span></b>:" + yval
+ "</span>";
1810 * Displays information about the selected points in the legend. If there is no
1811 * selection, the legend will be cleared.
1812 * @param { Number } [x] The x-value of the selected points.
1813 * @param { [Object] } [sel_points] List of selected points for the given
1814 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1816 Dygraph
.prototype.setLegendHTML_
= function(x
, sel_points
) {
1817 var labelsDiv
= this.attr_("labelsDiv");
1818 var sizeSpan
= document
.createElement('span');
1819 // Calculates the width of 1em in pixels for the legend.
1820 sizeSpan
.setAttribute('style', 'margin: 0; padding: 0 0 0 1em; border: 0;');
1821 labelsDiv
.appendChild(sizeSpan
);
1822 var oneEmWidth
=sizeSpan
.offsetWidth
;
1824 var html
= this.generateLegendHTML_(x
, sel_points
, oneEmWidth
);
1825 if (labelsDiv
!== null) {
1826 labelsDiv
.innerHTML
= html
;
1828 if (typeof(this.shown_legend_error_
) == 'undefined') {
1829 this.error('labelsDiv is set to something nonexistent; legend will not be shown.');
1830 this.shown_legend_error_
= true;
1835 Dygraph
.prototype.animateSelection_
= function(direction
) {
1836 var totalSteps
= 10;
1838 if (this.fadeLevel
=== undefined
) {
1842 var start
= this.fadeLevel
;
1843 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1845 if (this.fadeLevel
) {
1846 this.updateSelection_(1.0);
1851 var thisId
= ++this.animateId
;
1853 Dygraph
.repeatAndCleanup(
1855 // ignore simultaneous animations
1856 if (that
.animateId
!= thisId
) return;
1858 that
.fadeLevel
+= direction
;
1859 if (that
.fadeLevel
=== 0) {
1860 that
.clearSelection();
1862 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1865 steps
, millis
, function() {});
1869 * Draw dots over the selectied points in the data series. This function
1870 * takes care of cleanup of previously-drawn dots.
1873 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1874 // Clear the previously drawn vertical, if there is one
1876 var ctx
= this.canvas_ctx_
;
1877 if (this.attr_('highlightSeriesOpts')) {
1878 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1879 var alpha
= this.attr_('highlightSeriesBackgroundFade');
1881 if (this.attr_('highlightSeriesAnimate')) {
1882 if (opt_animFraction
=== undefined
) {
1883 // start a new animation
1884 this.animateSelection_(1);
1887 alpha
*= opt_animFraction
;
1889 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1890 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1892 var setIdx
= this.datasetIndexFromSetName_(this.highlightSet_
);
1893 this.plotter_
._drawLine(ctx
, setIdx
);
1894 } else if (this.previousVerticalX_
>= 0) {
1895 // Determine the maximum highlight circle size.
1896 var maxCircleSize
= 0;
1897 var labels
= this.attr_('labels');
1898 for (i
= 1; i
< labels
.length
; i
++) {
1899 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1900 if (r
> maxCircleSize
) maxCircleSize
= r
;
1902 var px
= this.previousVerticalX_
;
1903 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1904 2 * maxCircleSize
+ 2, this.height_
);
1907 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1908 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1911 if (this.selPoints_
.length
> 0) {
1912 // Set the status message to indicate the selected point(s)
1913 if (this.attr_('showLabelsOnHighlight')) {
1914 this.setLegendHTML_(this.lastx_
, this.selPoints_
);
1917 // Draw colored circles over the center of each selected point
1918 var canvasx
= this.selPoints_
[0].canvasx
;
1920 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1921 var pt
= this.selPoints_
[i
];
1922 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1924 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1926 ctx
.fillStyle
= this.plotter_
.colors
[pt
.name
];
1927 ctx
.arc(canvasx
, pt
.canvasy
, circleSize
, 0, 2 * Math
.PI
, false);
1932 this.previousVerticalX_
= canvasx
;
1937 * Manually set the selected points and display information about them in the
1938 * legend. The selection can be cleared using clearSelection() and queried
1939 * using getSelection().
1940 * @param { Integer } row number that should be highlighted (i.e. appear with
1941 * hover dots on the chart). Set to false to clear any selection.
1942 * @param { seriesName } optional series name to highlight that series with the
1943 * the highlightSeriesOpts setting.
1945 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
) {
1946 // Extract the points we've selected
1947 this.selPoints_
= [];
1950 if (row
!== false) {
1951 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1952 if (this.boundaryIds_
[i
] !== undefined
) {
1953 row
-= this.boundaryIds_
[i
][0];
1959 var changed
= false;
1960 if (row
!== false && row
>= 0) {
1961 if (row
!= this.lastRow_
) changed
= true;
1962 this.lastRow_
= row
;
1963 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1964 var set
= this.layout_
.datasets
[setIdx
];
1965 if (row
< set
.length
) {
1966 var point
= this.layout_
.points
[pos
+row
];
1968 if (this.attr_("stackedGraph")) {
1969 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1972 this.selPoints_
.push(point
);
1977 if (this.lastRow_
>= 0) changed
= true;
1981 if (this.selPoints_
.length
) {
1982 this.lastx_
= this.selPoints_
[0].xval
;
1987 if (opt_seriesName
!== undefined
) {
1988 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1989 this.highlightSet_
= opt_seriesName
;
1993 this.updateSelection_(undefined
);
1999 * The mouse has left the canvas. Clear out whatever artifacts remain
2000 * @param {Object} event the mouseout event from the browser.
2003 Dygraph
.prototype.mouseOut_
= function(event
) {
2004 if (this.attr_("unhighlightCallback")) {
2005 this.attr_("unhighlightCallback")(event
);
2008 if (this.attr_("hideOverlayOnMouseOut")) {
2009 this.clearSelection();
2014 * Clears the current selection (i.e. points that were highlighted by moving
2015 * the mouse over the chart).
2017 Dygraph
.prototype.clearSelection
= function() {
2018 // Get rid of the overlay data
2019 if (this.fadeLevel
) {
2020 this.animateSelection_(-1);
2023 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2025 this.setLegendHTML_();
2026 this.selPoints_
= [];
2029 this.highlightSet_
= null;
2033 * Returns the number of the currently selected row. To get data for this row,
2034 * you can use the getValue method.
2035 * @return { Integer } row number, or -1 if nothing is selected
2037 Dygraph
.prototype.getSelection
= function() {
2038 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2042 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
2043 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
2044 return row
+ this.boundaryIds_
[0][0];
2050 Dygraph
.prototype.getHighlightSeries
= function() {
2051 return this.highlightSet_
;
2055 * Fires when there's data available to be graphed.
2056 * @param {String} data Raw CSV data to be plotted
2059 Dygraph
.prototype.loadedEvent_
= function(data
) {
2060 this.rawData_
= this.parseCSV_(data
);
2065 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2068 Dygraph
.prototype.addXTicks_
= function() {
2069 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2071 if (this.dateWindow_
) {
2072 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2074 range
= this.fullXRange_();
2077 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2078 var xTicks
= xAxisOptionsView('ticker')(
2081 this.width_
, // TODO(danvk): should be area.width
2084 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2085 // console.log(msg);
2086 this.layout_
.setXTicks(xTicks
);
2091 * Computes the range of the data series (including confidence intervals).
2092 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2093 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2094 * @return [low, high]
2096 Dygraph
.prototype.extremeValues_
= function(series
) {
2097 var minY
= null, maxY
= null, j
, y
;
2099 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2101 // With custom bars, maxY is the max of the high values.
2102 for (j
= 0; j
< series
.length
; j
++) {
2103 y
= series
[j
][1][0];
2105 var low
= y
- series
[j
][1][1];
2106 var high
= y
+ series
[j
][1][2];
2107 if (low
> y
) low
= y
; // this can happen with custom bars,
2108 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2109 if (maxY
=== null || high
> maxY
) {
2112 if (minY
=== null || low
< minY
) {
2117 for (j
= 0; j
< series
.length
; j
++) {
2119 if (y
=== null || isNaN(y
)) continue;
2120 if (maxY
=== null || y
> maxY
) {
2123 if (minY
=== null || y
< minY
) {
2129 return [minY
, maxY
];
2134 * This function is called once when the chart's data is changed or the options
2135 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2136 * idea is that values derived from the chart's data can be computed here,
2137 * rather than every time the chart is drawn. This includes things like the
2138 * number of axes, rolling averages, etc.
2140 Dygraph
.prototype.predraw_
= function() {
2141 var start
= new Date();
2143 // TODO(danvk): move more computations out of drawGraph_ and into here.
2144 this.computeYAxes_();
2146 // Create a new plotter.
2147 if (this.plotter_
) this.plotter_
.clear();
2148 this.plotter_
= new DygraphCanvasRenderer(this,
2153 // The roller sits in the bottom left corner of the chart. We don't know where
2154 // this will be until the options are available, so it's positioned here.
2155 this.createRollInterface_();
2157 // Same thing applies for the labelsDiv. It's right edge should be flush with
2158 // the right edge of the charting area (which may not be the same as the right
2159 // edge of the div, if we have two y-axes.
2160 this.positionLabelsDiv_();
2162 if (this.rangeSelector_
) {
2163 this.rangeSelector_
.renderStaticLayer();
2166 // Convert the raw data (a 2D array) into the internal format and compute
2167 // rolling averages.
2168 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2169 for (var i
= 1; i
< this.numColumns(); i
++) {
2170 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
2171 var logScale
= this.attr_('logscale', i
);
2172 var series
= this.extractSeries_(this.rawData_
, i
, logScale
, connectSeparatedPoints
);
2173 series
= this.rollingAverage(series
, this.rollPeriod_
);
2174 this.rolledSeries_
.push(series
);
2177 // If the data or options have changed, then we'd better redraw.
2180 // This is used to determine whether to do various animations.
2181 var end
= new Date();
2182 this.drawingTimeMs_
= (end
- start
);
2186 * Loop over all fields and create datasets, calculating extreme y-values for
2187 * each series and extreme x-indices as we go.
2189 * dateWindow is passed in as an explicit parameter so that we can compute
2190 * extreme values "speculatively", i.e. without actually setting state on the
2193 * TODO(danvk): make this more of a true function
2194 * @return [ datasets, seriesExtremes, boundaryIds ]
2197 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2198 var boundaryIds
= [];
2199 var cumulative_y
= []; // For stacked series.
2201 var extremes
= {}; // series name -> [low, high]
2204 // Loop over the fields (series). Go from the last to the first,
2205 // because if they're stacked that's how we accumulate the values.
2206 var num_series
= rolledSeries
.length
- 1;
2207 for (i
= num_series
; i
>= 1; i
--) {
2208 if (!this.visibility()[i
- 1]) continue;
2210 // TODO(danvk): is this copy really necessary?
2212 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2213 series
.push(rolledSeries
[i
][j
]);
2216 // Prune down to the desired range, if necessary (for zooming)
2217 // Because there can be lines going to points outside of the visible area,
2218 // we actually prune to visible points, plus one on either side.
2219 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2221 var low
= dateWindow
[0];
2222 var high
= dateWindow
[1];
2224 // TODO(danvk): do binary search instead of linear search.
2225 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2226 var firstIdx
= null, lastIdx
= null;
2227 for (k
= 0; k
< series
.length
; k
++) {
2228 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2231 if (series
[k
][0] <= high
) {
2235 if (firstIdx
=== null) firstIdx
= 0;
2236 if (firstIdx
> 0) firstIdx
--;
2237 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2238 if (lastIdx
< series
.length
- 1) lastIdx
++;
2239 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2240 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2241 pruned
.push(series
[k
]);
2245 boundaryIds
[i
-1] = [0, series
.length
-1];
2248 var seriesExtremes
= this.extremeValues_(series
);
2251 for (j
=0; j
<series
.length
; j
++) {
2252 series
[j
] = [series
[j
][0],
2257 } else if (this.attr_("stackedGraph")) {
2258 var l
= series
.length
;
2260 for (j
= 0; j
< l
; j
++) {
2261 // If one data set has a NaN, let all subsequent stacked
2262 // sets inherit the NaN -- only start at 0 for the first set.
2263 var x
= series
[j
][0];
2264 if (cumulative_y
[x
] === undefined
) {
2265 cumulative_y
[x
] = 0;
2268 actual_y
= series
[j
][1];
2269 cumulative_y
[x
] += actual_y
;
2271 series
[j
] = [x
, cumulative_y
[x
]];
2273 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2274 seriesExtremes
[1] = cumulative_y
[x
];
2276 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2277 seriesExtremes
[0] = cumulative_y
[x
];
2282 var seriesName
= this.attr_("labels")[i
];
2283 extremes
[seriesName
] = seriesExtremes
;
2284 datasets
[i
] = series
;
2287 return [ datasets
, extremes
, boundaryIds
];
2291 * Update the graph with new data. This method is called when the viewing area
2292 * has changed. If the underlying data or options have changed, predraw_ will
2293 * be called before drawGraph_ is called.
2295 * clearSelection, when undefined or true, causes this.clearSelection to be
2296 * called at the end of the draw operation. This should rarely be defined,
2297 * and never true (that is it should be undefined most of the time, and
2302 Dygraph
.prototype.drawGraph_
= function(clearSelection
) {
2303 var start
= new Date();
2305 if (typeof(clearSelection
) === 'undefined') {
2306 clearSelection
= true;
2309 // This is used to set the second parameter to drawCallback, below.
2310 var is_initial_draw
= this.is_initial_draw_
;
2311 this.is_initial_draw_
= false;
2313 this.layout_
.removeAllDatasets();
2315 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2317 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2318 var datasets
= packed
[0];
2319 var extremes
= packed
[1];
2320 this.boundaryIds_
= packed
[2];
2322 this.setIndexByName_
= {};
2323 var labels
= this.attr_("labels");
2324 if (labels
.length
> 0) {
2325 this.setIndexByName_
[labels
[0]] = 0;
2328 for (var i
= 1; i
< datasets
.length
; i
++) {
2329 this.setIndexByName_
[labels
[i
]] = i
;
2330 if (!this.visibility()[i
- 1]) continue;
2331 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2332 this.datasetIndex_
[i
] = dataIdx
++;
2335 this.computeYAxisRanges_(extremes
);
2336 this.layout_
.setYAxes(this.axes_
);
2340 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2341 var tmp_zoomed_x
= this.zoomed_x_
;
2342 // Tell PlotKit to use this new data and render itself
2343 this.layout_
.setDateWindow(this.dateWindow_
);
2344 this.zoomed_x_
= tmp_zoomed_x
;
2345 this.layout_
.evaluateWithError();
2346 this.renderGraph_(is_initial_draw
, false);
2348 if (this.attr_("timingName")) {
2349 var end
= new Date();
2351 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2356 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
, clearSelection
) {
2357 this.plotter_
.clear();
2358 this.plotter_
.render();
2359 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2360 this.canvas_
.height
);
2362 // Generate a static legend before any particular point is selected.
2363 this.setLegendHTML_();
2365 if (!is_initial_draw
) {
2366 if (clearSelection
) {
2367 if (typeof(this.selPoints_
) !== 'undefined' && this.selPoints_
.length
) {
2368 // We should select the point nearest the page x/y here
, but it
's easier
2369 // to just clear the selection. This prevents erroneous hover dots from
2371 this.clearSelection();
2373 this.clearSelection();
2378 if (this.rangeSelector_) {
2379 this.rangeSelector_.renderInteractiveLayer();
2382 if (this.attr_("drawCallback") !== null) {
2383 this.attr_("drawCallback")(this, is_initial_draw);
2389 * Determine properties of the y-axes which are independent of the data
2390 * currently being displayed. This includes things like the number of axes and
2391 * the style of the axes. It does not include the range of each axis and its
2393 * This fills in this.axes_ and this.seriesToAxisMap_.
2394 * axes_ = [ { options } ]
2395 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2396 * indices are into the axes_ array.
2398 Dygraph.prototype.computeYAxes_ = function() {
2399 // Preserve valueWindow settings if they exist, and if the user hasn't
2400 // specified a new valueRange.
2401 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2402 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2404 for (index
= 0; index
< this.axes_
.length
; index
++) {
2405 valueWindows
.push(this.axes_
[index
].valueWindow
);
2409 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2410 this.seriesToAxisMap_
= {};
2412 // Get a list of series names.
2413 var labels
= this.attr_("labels");
2415 for (i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2417 // all options which could be applied per-axis:
2425 'axisLabelFontSize',
2430 // Copy global axis options over to the first axis.
2431 for (i
= 0; i
< axisOptions
.length
; i
++) {
2432 var k
= axisOptions
[i
];
2434 if (v
) this.axes_
[0][k
] = v
;
2437 // Go through once and add all the axes.
2438 for (seriesName
in series
) {
2439 if (!series
.hasOwnProperty(seriesName
)) continue;
2440 axis
= this.attr_("axis", seriesName
);
2441 if (axis
=== null) {
2442 this.seriesToAxisMap_
[seriesName
] = 0;
2445 if (typeof(axis
) == 'object') {
2446 // Add a new axis, making a copy of its per-axis options.
2448 Dygraph
.update(opts
, this.axes_
[0]);
2449 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2450 var yAxisId
= this.axes_
.length
;
2451 opts
.yAxisId
= yAxisId
;
2453 Dygraph
.update(opts
, axis
);
2454 this.axes_
.push(opts
);
2455 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2459 // Go through one more time and assign series to an axis defined by another
2460 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2461 for (seriesName
in series
) {
2462 if (!series
.hasOwnProperty(seriesName
)) continue;
2463 axis
= this.attr_("axis", seriesName
);
2464 if (typeof(axis
) == 'string') {
2465 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2466 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2467 "series " + axis
+ ", which does not define its own axis.");
2470 var idx
= this.seriesToAxisMap_
[axis
];
2471 this.seriesToAxisMap_
[seriesName
] = idx
;
2475 if (valueWindows
!== undefined
) {
2476 // Restore valueWindow settings.
2477 for (index
= 0; index
< valueWindows
.length
; index
++) {
2478 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2483 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2485 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2486 v
= opts("valueRange");
2487 if (v
) this.axes_
[axis
].valueRange
= v
;
2488 } else { // To keep old behavior
2489 var axes
= this.user_attrs_
.axes
;
2490 if (axes
&& axes
.y2
) {
2491 v
= axes
.y2
.valueRange
;
2492 if (v
) this.axes_
[axis
].valueRange
= v
;
2500 * Returns the number of y-axes on the chart.
2501 * @return {Number} the number of axes.
2503 Dygraph
.prototype.numAxes
= function() {
2505 for (var series
in this.seriesToAxisMap_
) {
2506 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2507 var idx
= this.seriesToAxisMap_
[series
];
2508 if (idx
> last_axis
) last_axis
= idx
;
2510 return 1 + last_axis
;
2515 * Returns axis properties for the given series.
2516 * @param { String } setName The name of the series for which to get axis
2517 * properties, e.g. 'Y1'.
2518 * @return { Object } The axis properties.
2520 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2521 // TODO(danvk): handle errors.
2522 return this.axes_
[this.seriesToAxisMap_
[series
]];
2527 * Determine the value range and tick marks for each axis.
2528 * @param {Object} extremes A mapping from seriesName -> [low, high]
2529 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2531 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2532 // Build a map from axis number -> [list of series names]
2533 var seriesForAxis
= [], series
;
2534 for (series
in this.seriesToAxisMap_
) {
2535 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2536 var idx
= this.seriesToAxisMap_
[series
];
2537 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2538 seriesForAxis
[idx
].push(series
);
2541 // Compute extreme values, a span and tick marks for each axis.
2542 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2543 var axis
= this.axes_
[i
];
2545 if (!seriesForAxis
[i
]) {
2546 // If no series are defined or visible then use a reasonable default
2547 axis
.extremeRange
= [0, 1];
2549 // Calculate the extremes of extremes.
2550 series
= seriesForAxis
[i
];
2551 var minY
= Infinity
; // extremes[series[0]][0];
2552 var maxY
= -Infinity
; // extremes[series[0]][1];
2553 var extremeMinY
, extremeMaxY
;
2555 for (var j
= 0; j
< series
.length
; j
++) {
2556 // this skips invisible series
2557 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2559 // Only use valid extremes to stop null data series' from corrupting the scale.
2560 extremeMinY
= extremes
[series
[j
]][0];
2561 if (extremeMinY
!== null) {
2562 minY
= Math
.min(extremeMinY
, minY
);
2564 extremeMaxY
= extremes
[series
[j
]][1];
2565 if (extremeMaxY
!== null) {
2566 maxY
= Math
.max(extremeMaxY
, maxY
);
2569 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2571 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2572 if (minY
== Infinity
) minY
= 0;
2573 if (maxY
== -Infinity
) maxY
= 1;
2575 // Add some padding and round up to an integer to be human-friendly.
2576 var span
= maxY
- minY
;
2577 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2578 if (span
=== 0) { span
= maxY
; }
2580 var maxAxisY
, minAxisY
;
2581 if (axis
.logscale
) {
2582 maxAxisY
= maxY
+ 0.1 * span
;
2585 maxAxisY
= maxY
+ 0.1 * span
;
2586 minAxisY
= minY
- 0.1 * span
;
2588 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2589 if (!this.attr_("avoidMinZero")) {
2590 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2591 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2594 if (this.attr_("includeZero")) {
2595 if (maxY
< 0) maxAxisY
= 0;
2596 if (minY
> 0) minAxisY
= 0;
2599 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2601 if (axis
.valueWindow
) {
2602 // This is only set if the user has zoomed on the y-axis. It is never set
2603 // by a user. It takes precedence over axis.valueRange because, if you set
2604 // valueRange, you'd still expect to be able to pan.
2605 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2606 } else if (axis
.valueRange
) {
2607 // This is a user-set value range for this axis.
2608 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2610 axis
.computedValueRange
= axis
.extremeRange
;
2613 // Add ticks. By default, all axes inherit the tick positions of the
2614 // primary axis. However, if an axis is specifically marked as having
2615 // independent ticks, then that is permissible as well.
2616 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2617 var ticker
= opts('ticker');
2618 if (i
=== 0 || axis
.independentTicks
) {
2619 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2620 axis
.computedValueRange
[1],
2621 this.height_
, // TODO(danvk): should be area.height
2625 var p_axis
= this.axes_
[0];
2626 var p_ticks
= p_axis
.ticks
;
2627 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2628 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2629 var tick_values
= [];
2630 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2631 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2632 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2633 tick_values
.push(y_val
);
2636 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2637 axis
.computedValueRange
[1],
2638 this.height_
, // TODO(danvk): should be area.height
2647 * Extracts one series from the raw data (a 2D array) into an array of (date,
2650 * This is where undesirable points (i.e. negative values on log scales and
2651 * missing values through which we wish to connect lines) are dropped.
2655 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
, connectSeparatedPoints
) {
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. Note that this ignores
2663 // connectSeparatedPoints.
2667 series
.push([x
, point
]);
2669 if (point
!== null || !connectSeparatedPoints
) {
2670 series
.push([x
, point
]);
2679 * Calculates the rolling average of a data set.
2680 * If originalData is [label, val], rolls the average of those.
2681 * If originalData is [label, [, it's interpreted as [value, stddev]
2682 * and the roll is returned in the same form, with appropriately reduced
2683 * stddev for each value.
2684 * Note that this is where fractional input (i.e. '5/10') is converted into
2686 * @param {Array} originalData The data in the appropriate format (see above)
2687 * @param {Number} rollPeriod The number of points over which to average the
2690 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2691 if (originalData
.length
< 2)
2692 return originalData
;
2693 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2694 var rollingData
= [];
2695 var sigma
= this.attr_("sigma");
2697 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2698 if (this.fractions_
) {
2700 var den
= 0; // numerator/denominator
2702 for (i
= 0; i
< originalData
.length
; i
++) {
2703 num
+= originalData
[i
][1][0];
2704 den
+= originalData
[i
][1][1];
2705 if (i
- rollPeriod
>= 0) {
2706 num
-= originalData
[i
- rollPeriod
][1][0];
2707 den
-= originalData
[i
- rollPeriod
][1][1];
2710 var date
= originalData
[i
][0];
2711 var value
= den
? num
/ den
: 0.0;
2712 if (this.attr_("errorBars")) {
2713 if (this.attr_("wilsonInterval")) {
2714 // For more details on this confidence interval, see:
2715 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2717 var p
= value
< 0 ? 0 : value
, n
= den
;
2718 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2719 var denom
= 1 + sigma
* sigma
/ den
;
2720 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2721 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2722 rollingData
[i
] = [date
,
2723 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2725 rollingData
[i
] = [date
, [0, 0, 0]];
2728 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2729 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2732 rollingData
[i
] = [date
, mult
* value
];
2735 } else if (this.attr_("customBars")) {
2740 for (i
= 0; i
< originalData
.length
; i
++) {
2741 var data
= originalData
[i
][1];
2743 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2745 if (y
!== null && !isNaN(y
)) {
2751 if (i
- rollPeriod
>= 0) {
2752 var prev
= originalData
[i
- rollPeriod
];
2753 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2761 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2762 1.0 * (mid
- low
) / count
,
2763 1.0 * (high
- mid
) / count
]];
2765 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2769 // Calculate the rolling average for the first rollPeriod - 1 points where
2770 // there is not enough data to roll over the full number of points
2771 if (!this.attr_("errorBars")){
2772 if (rollPeriod
== 1) {
2773 return originalData
;
2776 for (i
= 0; i
< originalData
.length
; i
++) {
2779 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2780 y
= originalData
[j
][1];
2781 if (y
=== null || isNaN(y
)) continue;
2783 sum
+= originalData
[j
][1];
2786 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2788 rollingData
[i
] = [originalData
[i
][0], null];
2793 for (i
= 0; i
< originalData
.length
; i
++) {
2797 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2798 y
= originalData
[j
][1][0];
2799 if (y
=== null || isNaN(y
)) continue;
2801 sum
+= originalData
[j
][1][0];
2802 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2805 stddev
= Math
.sqrt(variance
) / num_ok
;
2806 rollingData
[i
] = [originalData
[i
][0],
2807 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2809 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2819 * Detects the type of the str (date or numeric) and sets the various
2820 * formatting attributes in this.attrs_ based on this type.
2821 * @param {String} str An x value.
2824 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2826 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2827 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2828 str
.indexOf('/') >= 0 ||
2829 isNaN(parseFloat(str
))) {
2831 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2832 // TODO(danvk): remove support for this format.
2837 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2838 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2839 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2840 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2842 /** @private (shut up, jsdoc!) */
2843 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2844 // TODO(danvk): use Dygraph.numberValueFormatter here?
2845 /** @private (shut up, jsdoc!) */
2846 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2847 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2848 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2853 * Parses the value as a floating point number. This is like the parseFloat()
2854 * built-in, but with a few differences:
2855 * - the empty string is parsed as null, rather than NaN.
2856 * - if the string cannot be parsed at all, an error is logged.
2857 * If the string can't be parsed, this method returns null.
2858 * @param {String} x The string to be parsed
2859 * @param {Number} opt_line_no The line number from which the string comes.
2860 * @param {String} opt_line The text of the line from which the string comes.
2864 // Parse the x as a float or return null if it's not a number.
2865 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2866 var val
= parseFloat(x
);
2867 if (!isNaN(val
)) return val
;
2869 // Try to figure out what happeend.
2870 // If the value is the empty string, parse it as null.
2871 if (/^ *$/.test(x
)) return null;
2873 // If it was actually "NaN", return it as NaN.
2874 if (/^ *nan *$/i.test(x
)) return NaN
;
2876 // Looks like a parsing error.
2877 var msg
= "Unable to parse '" + x
+ "' as a number";
2878 if (opt_line
!== null && opt_line_no
!== null) {
2879 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2888 * Parses a string in a special csv format. We expect a csv file where each
2889 * line is a date point, and the first field in each line is the date string.
2890 * We also expect that all remaining fields represent series.
2891 * if the errorBars attribute is set, then interpret the fields as:
2892 * date, series1, stddev1, series2, stddev2, ...
2893 * @param {[Object]} data See above.
2895 * @return [Object] An array with one entry for each row. These entries
2896 * are an array of cells in that row. The first entry is the parsed x-value for
2897 * the row. The second, third, etc. are the y-values. These can take on one of
2898 * three forms, depending on the CSV and constructor parameters:
2900 * 2. [ value, stddev ]
2901 * 3. [ low value, center value, high value ]
2903 Dygraph
.prototype.parseCSV_
= function(data
) {
2905 var lines
= data
.split("\n");
2908 // Use the default delimiter or fall back to a tab if that makes sense.
2909 var delim
= this.attr_('delimiter');
2910 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2915 if (!('labels' in this.user_attrs_
)) {
2916 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2918 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2923 var defaultParserSet
= false; // attempt to auto-detect x value type
2924 var expectedCols
= this.attr_("labels").length
;
2925 var outOfOrder
= false;
2926 for (var i
= start
; i
< lines
.length
; i
++) {
2927 var line
= lines
[i
];
2929 if (line
.length
=== 0) continue; // skip blank lines
2930 if (line
[0] == '#') continue; // skip comment lines
2931 var inFields
= line
.split(delim
);
2932 if (inFields
.length
< 2) continue;
2935 if (!defaultParserSet
) {
2936 this.detectTypeFromString_(inFields
[0]);
2937 xParser
= this.attr_("xValueParser");
2938 defaultParserSet
= true;
2940 fields
[0] = xParser(inFields
[0], this);
2942 // If fractions are expected, parse the numbers as "A/B
"
2943 if (this.fractions_) {
2944 for (j = 1; j < inFields.length; j++) {
2945 // TODO(danvk): figure out an appropriate way to flag parse errors.
2946 vals = inFields[j].split("/");
2947 if (vals.length != 2) {
2948 this.error('Expected fractional "num
/den
" values in CSV data ' +
2949 "but found a value
'" + inFields[j] + "' on line
" +
2950 (1 + i) + " ('" + line + "') which is not of
this form
.");
2953 fields[j] = [this.parseFloat_(vals[0], i, line),
2954 this.parseFloat_(vals[1], i, line)];
2957 } else if (this.attr_("errorBars
")) {
2958 // If there are error bars, values are (value, stddev) pairs
2959 if (inFields.length % 2 != 1) {
2960 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2961 'but line ' + (1 + i) + ' has an odd number of values (' +
2962 (inFields.length - 1) + "): '" + line + "'");
2964 for (j = 1; j < inFields.length; j += 2) {
2965 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2966 this.parseFloat_(inFields[j + 1], i, line)];
2968 } else if (this.attr_("customBars
")) {
2969 // Bars are a low;center;high tuple
2970 for (j = 1; j < inFields.length; j++) {
2971 var val = inFields[j];
2972 if (/^ *$/.test(val)) {
2973 fields[j] = [null, null, null];
2975 vals = val.split(";");
2976 if (vals.length == 3) {
2977 fields[j] = [ this.parseFloat_(vals[0], i, line),
2978 this.parseFloat_(vals[1], i, line),
2979 this.parseFloat_(vals[2], i, line) ];
2981 this.warn('When using customBars, values must be either blank ' +
2982 'or "low
;center
;high
" tuples (got "' + val +
2983 '" on line ' + (1+i));
2988 // Values are just numbers
2989 for (j = 1; j < inFields.length; j++) {
2990 fields[j] = this.parseFloat_(inFields[j], i, line);
2993 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2997 if (fields.length != expectedCols) {
2998 this.error("Number of columns
in line
" + i + " (" + fields.length +
2999 ") does not agree
with number of
labels (" + expectedCols +
3003 // If the user specified the 'labels' option and none of the cells of the
3004 // first row parsed correctly, then they probably double-specified the
3005 // labels. We go with the values set in the option, discard this row and
3006 // log a warning to the JS console.
3007 if (i === 0 && this.attr_('labels')) {
3008 var all_null = true;
3009 for (j = 0; all_null && j < fields.length; j++) {
3010 if (fields[j]) all_null = false;
3013 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3014 "CSV
data ('" + line + "') appears to also contain labels
. " +
3015 "Will drop the CSV labels and
use the option labels
.");
3023 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3024 ret.sort(function(a,b) { return a[0] - b[0]; });
3032 * The user has provided their data as a pre-packaged JS array. If the x values
3033 * are numeric, this is the same as dygraphs' internal format. If the x values
3034 * are dates, we need to convert them from Date objects to ms since epoch.
3035 * @param {[Object]} data
3036 * @return {[Object]} data with numeric x values.
3038 Dygraph.prototype.parseArray_ = function(data) {
3039 // Peek at the first x value to see if it's numeric.
3040 if (data.length === 0) {
3041 this.error("Can
't plot empty data set");
3044 if (data[0].length === 0) {
3045 this.error("Data set cannot contain an empty row");
3050 if (this.attr_("labels") === null) {
3051 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3052 "in the options parameter");
3053 this.attrs_.labels = [ "X" ];
3054 for (i = 1; i < data[0].length; i++) {
3055 this.attrs_.labels.push("Y" + i);
3059 if (Dygraph.isDateLike(data[0][0])) {
3060 // Some intelligent defaults for a date x-axis.
3061 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3062 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3063 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3065 // Assume they're all dates
.
3066 var parsedData
= Dygraph
.clone(data
);
3067 for (i
= 0; i
< data
.length
; i
++) {
3068 if (parsedData
[i
].length
=== 0) {
3069 this.error("Row " + (1 + i
) + " of data is empty");
3072 if (parsedData
[i
][0] === null ||
3073 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3074 isNaN(parsedData
[i
][0].getTime())) {
3075 this.error("x value in row " + (1 + i
) + " is not a Date");
3078 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3082 // Some intelligent defaults for a numeric x-axis.
3083 /** @private (shut up, jsdoc!) */
3084 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3085 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3086 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
3092 * Parses a DataTable object from gviz.
3093 * The data is expected to have a first column that is either a date or a
3094 * number. All subsequent columns must be numbers. If there is a clear mismatch
3095 * between this.xValueParser_ and the type of the first column, it will be
3096 * fixed. Fills out rawData_.
3097 * @param {[Object]} data See above.
3100 Dygraph
.prototype.parseDataTable_
= function(data
) {
3101 var shortTextForAnnotationNum
= function(num
) {
3102 // converts [0-9]+ [A-Z][a-z]*
3103 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3104 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3105 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3106 num
= Math
.floor(num
/ 26);
3108 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3109 num
= Math
.floor((num
- 1) / 26);
3114 var cols
= data
.getNumberOfColumns();
3115 var rows
= data
.getNumberOfRows();
3117 var indepType
= data
.getColumnType(0);
3118 if (indepType
== 'date' || indepType
== 'datetime') {
3119 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3120 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3121 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3122 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3123 } else if (indepType
== 'number') {
3124 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3125 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3126 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
3127 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3129 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3130 "column 1 of DataTable input (Got '" + indepType
+ "')");
3134 // Array of the column indices which contain data (and not annotations).
3136 var annotationCols
= {}; // data index -> [annotation cols]
3137 var hasAnnotations
= false;
3139 for (i
= 1; i
< cols
; i
++) {
3140 var type
= data
.getColumnType(i
);
3141 if (type
== 'number') {
3143 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3144 // This is OK -- it's an annotation column.
3145 var dataIdx
= colIdx
[colIdx
.length
- 1];
3146 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3147 annotationCols
[dataIdx
] = [i
];
3149 annotationCols
[dataIdx
].push(i
);
3151 hasAnnotations
= true;
3153 this.error("Only 'number' is supported as a dependent type with Gviz." +
3154 " 'string' is only supported if displayAnnotations is true");
3158 // Read column labels
3159 // TODO(danvk): add support back for errorBars
3160 var labels
= [data
.getColumnLabel(0)];
3161 for (i
= 0; i
< colIdx
.length
; i
++) {
3162 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3163 if (this.attr_("errorBars")) i
+= 1;
3165 this.attrs_
.labels
= labels
;
3166 cols
= labels
.length
;
3169 var outOfOrder
= false;
3170 var annotations
= [];
3171 for (i
= 0; i
< rows
; i
++) {
3173 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3174 data
.getValue(i
, 0) === null) {
3175 this.warn("Ignoring row " + i
+
3176 " of DataTable because of undefined or null first column.");
3180 if (indepType
== 'date' || indepType
== 'datetime') {
3181 row
.push(data
.getValue(i
, 0).getTime());
3183 row
.push(data
.getValue(i
, 0));
3185 if (!this.attr_("errorBars")) {
3186 for (j
= 0; j
< colIdx
.length
; j
++) {
3187 var col
= colIdx
[j
];
3188 row
.push(data
.getValue(i
, col
));
3189 if (hasAnnotations
&&
3190 annotationCols
.hasOwnProperty(col
) &&
3191 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3193 ann
.series
= data
.getColumnLabel(col
);
3195 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3197 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3198 if (k
) ann
.text
+= "\n";
3199 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3201 annotations
.push(ann
);
3205 // Strip out infinities, which give dygraphs problems later on.
3206 for (j
= 0; j
< row
.length
; j
++) {
3207 if (!isFinite(row
[j
])) row
[j
] = null;
3210 for (j
= 0; j
< cols
- 1; j
++) {
3211 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3214 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3221 this.warn("DataTable is out of order; order it correctly to speed loading.");
3222 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3224 this.rawData_
= ret
;
3226 if (annotations
.length
> 0) {
3227 this.setAnnotations(annotations
, true);
3232 * Get the CSV data. If it's in a function, call that function. If it's in a
3233 * file, do an XMLHttpRequest to get it.
3236 Dygraph
.prototype.start_
= function() {
3237 var data
= this.file_
;
3239 // Functions can return references of all other types.
3240 if (typeof data
== 'function') {
3244 if (Dygraph
.isArrayLike(data
)) {
3245 this.rawData_
= this.parseArray_(data
);
3247 } else if (typeof data
== 'object' &&
3248 typeof data
.getColumnRange
== 'function') {
3249 // must be a DataTable from gviz.
3250 this.parseDataTable_(data
);
3252 } else if (typeof data
== 'string') {
3253 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3254 if (data
.indexOf('\n') >= 0) {
3255 this.loadedEvent_(data
);
3257 var req
= new XMLHttpRequest();
3259 req
.onreadystatechange
= function () {
3260 if (req
.readyState
== 4) {
3261 if (req
.status
=== 200 || // Normal http
3262 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3263 caller
.loadedEvent_(req
.responseText
);
3268 req
.open("GET", data
, true);
3272 this.error("Unknown data format: " + (typeof data
));
3277 * Changes various properties of the graph. These can include:
3279 * <li>file: changes the source data for the graph</li>
3280 * <li>errorBars: changes whether the data contains stddev</li>
3283 * There's a huge variety of options that can be passed to this method. For a
3284 * full list, see http://dygraphs.com/options.html.
3286 * @param {Object} attrs The new properties and values
3287 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3288 * call to updateOptions(). If you know better, you can pass true to explicitly
3289 * block the redraw. This can be useful for chaining updateOptions() calls,
3290 * avoiding the occasional infinite loop and preventing redraws when it's not
3291 * necessary (e.g. when updating a callback).
3293 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3294 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3296 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3297 var file
= input_attrs
.file
;
3298 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3300 // TODO(danvk): this is a mess. Move these options into attr_.
3301 if ('rollPeriod' in attrs
) {
3302 this.rollPeriod_
= attrs
.rollPeriod
;
3304 if ('dateWindow' in attrs
) {
3305 this.dateWindow_
= attrs
.dateWindow
;
3306 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3307 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3310 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3311 this.zoomed_y_
= (attrs
.valueRange
!== null);
3314 // TODO(danvk): validate per-series options.
3319 // highlightCircleSize
3321 // Check if this set options will require new points.
3322 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3324 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3328 if (!block_redraw
) this.start_();
3330 if (!block_redraw
) {
3331 if (requiresNewPoints
) {
3334 this.renderGraph_(false, false);
3341 * Returns a copy of the options with deprecated names converted into current
3342 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3343 * interested in that, they should save a copy before calling this.
3346 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3348 for (var k
in attrs
) {
3349 if (k
== 'file') continue;
3350 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3353 var set
= function(axis
, opt
, value
) {
3354 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3355 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3356 my_attrs
.axes
[axis
][opt
] = value
;
3358 var map
= function(opt
, axis
, new_opt
) {
3359 if (typeof(attrs
[opt
]) != 'undefined') {
3360 set(axis
, new_opt
, attrs
[opt
]);
3361 delete my_attrs
[opt
];
3365 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3366 map('xValueFormatter', 'x', 'valueFormatter');
3367 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3368 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3369 map('xTicker', 'x', 'ticker');
3370 map('yValueFormatter', 'y', 'valueFormatter');
3371 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3372 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3373 map('yTicker', 'y', 'ticker');
3378 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3379 * containing div (which has presumably changed size since the dygraph was
3380 * instantiated. If the width/height are specified, the div will be resized.
3382 * This is far more efficient than destroying and re-instantiating a
3383 * Dygraph, since it doesn't have to reparse the underlying data.
3385 * @param {Number} [width] Width (in pixels)
3386 * @param {Number} [height] Height (in pixels)
3388 Dygraph
.prototype.resize
= function(width
, height
) {
3389 if (this.resize_lock
) {
3392 this.resize_lock
= true;
3394 if ((width
=== null) != (height
=== null)) {
3395 this.warn("Dygraph.resize() should be called with zero parameters or " +
3396 "two non-NULL parameters. Pretending it was zero.");
3397 width
= height
= null;
3400 var old_width
= this.width_
;
3401 var old_height
= this.height_
;
3404 this.maindiv_
.style
.width
= width
+ "px";
3405 this.maindiv_
.style
.height
= height
+ "px";
3406 this.width_
= width
;
3407 this.height_
= height
;
3409 this.width_
= this.maindiv_
.clientWidth
;
3410 this.height_
= this.maindiv_
.clientHeight
;
3413 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3414 // TODO(danvk): there should be a clear() method.
3415 this.maindiv_
.innerHTML
= "";
3416 this.roller_
= null;
3417 this.attrs_
.labelsDiv
= null;
3418 this.createInterface_();
3419 if (this.annotations_
.length
) {
3420 // createInterface_ reset the layout, so we need to do this.
3421 this.layout_
.setAnnotations(this.annotations_
);
3426 this.resize_lock
= false;
3430 * Adjusts the number of points in the rolling average. Updates the graph to
3431 * reflect the new averaging period.
3432 * @param {Number} length Number of points over which to average the data.
3434 Dygraph
.prototype.adjustRoll
= function(length
) {
3435 this.rollPeriod_
= length
;
3440 * Returns a boolean array of visibility statuses.
3442 Dygraph
.prototype.visibility
= function() {
3443 // Do lazy-initialization, so that this happens after we know the number of
3445 if (!this.attr_("visibility")) {
3446 this.attrs_
.visibility
= [];
3448 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3449 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3450 this.attrs_
.visibility
.push(true);
3452 return this.attr_("visibility");
3456 * Changes the visiblity of a series.
3458 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3459 var x
= this.visibility();
3460 if (num
< 0 || num
>= x
.length
) {
3461 this.warn("invalid series number in setVisibility: " + num
);
3469 * How large of an area will the dygraph render itself in?
3470 * This is used for testing.
3471 * @return A {width: w, height: h} object.
3474 Dygraph
.prototype.size
= function() {
3475 return { width
: this.width_
, height
: this.height_
};
3479 * Update the list of annotations and redraw the chart.
3480 * See dygraphs.com/annotations.html for more info on how to use annotations.
3481 * @param ann {Array} An array of annotation objects.
3482 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3484 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3485 // Only add the annotation CSS rule once we know it will be used.
3486 Dygraph
.addAnnotationRule();
3487 this.annotations_
= ann
;
3488 this.layout_
.setAnnotations(this.annotations_
);
3489 if (!suppressDraw
) {
3495 * Return the list of annotations.
3497 Dygraph
.prototype.annotations
= function() {
3498 return this.annotations_
;
3502 * Get the list of label names for this graph. The first column is the
3503 * x-axis, so the data series names start at index 1.
3505 Dygraph
.prototype.getLabels
= function(name
) {
3506 return this.attr_("labels").slice();
3510 * Get the index of a series (column) given its name. The first column is the
3511 * x-axis, so the data series start with index 1.
3513 Dygraph
.prototype.indexFromSetName
= function(name
) {
3514 return this.setIndexByName_
[name
];
3518 * Get the internal dataset index given its name. These are numbered starting from 0,
3519 * and only count visible sets.
3522 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3523 return this.datasetIndex_
[this.indexFromSetName(name
)];
3528 * Adds a default style for the annotation CSS classes to the document. This is
3529 * only executed when annotations are actually used. It is designed to only be
3530 * called once -- all calls after the first will return immediately.
3532 Dygraph
.addAnnotationRule
= function() {
3533 if (Dygraph
.addedAnnotationCSS
) return;
3535 var rule
= "border: 1px solid black; " +
3536 "background-color: white; " +
3537 "text-align: center;";
3539 var styleSheetElement
= document
.createElement("style");
3540 styleSheetElement
.type
= "text/css";
3541 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3543 // Find the first style sheet that we can access.
3544 // We may not add a rule to a style sheet from another domain for security
3545 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3546 // adds its own style sheets from google.com.
3547 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3548 if (document
.styleSheets
[i
].disabled
) continue;
3549 var mysheet
= document
.styleSheets
[i
];
3551 if (mysheet
.insertRule
) { // Firefox
3552 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3553 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3554 } else if (mysheet
.addRule
) { // IE
3555 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3557 Dygraph
.addedAnnotationCSS
= true;
3560 // Was likely a security exception.
3564 this.warn("Unable to add default annotation CSS rule; display may be off.");
3567 // Older pages may still use this name.
3568 var DateGraph
= Dygraph
;