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 highlightSeriesBackgroundAlpha
: 0.5,
194 // TODO(danvk): move defaults from createStatusMessage_ here.
196 labelsSeparateLines
: false,
197 labelsShowZeroValues
: true,
200 showLabelsOnHighlight
: true,
202 digitsAfterDecimal
: 2,
207 strokeBorderWidth
: 0,
208 strokeBorderColor
: "white",
211 axisLabelFontSize
: 14,
217 xValueParser
: Dygraph
.dateParser
,
224 wilsonInterval
: true, // only relevant if fractions is true
228 connectSeparatedPoints
: false,
231 hideOverlayOnMouseOut
: true,
233 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
234 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
239 // Sizes of the various chart labels.
246 axisLineColor
: "black",
249 axisLabelColor
: "black",
250 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
254 gridLineColor
: "rgb(128,128,128)",
256 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
257 animatedZooms
: false, // (for now)
259 // Range selector options
260 showRangeSelector
: false,
261 rangeSelectorHeight
: 40,
262 rangeSelectorPlotStrokeColor
: "#808FAB",
263 rangeSelectorPlotFillColor
: "#A7B1C4",
269 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
270 valueFormatter
: Dygraph
.dateString_
,
271 ticker
: null // will be set in dygraph-tickers.js
275 valueFormatter
: Dygraph
.numberValueFormatter
,
276 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
277 ticker
: null // will be set in dygraph-tickers.js
281 valueFormatter
: Dygraph
.numberValueFormatter
,
282 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
283 ticker
: null // will be set in dygraph-tickers.js
288 // Directions for panning and zooming. Use bit operations when combined
289 // values are possible.
290 Dygraph
.HORIZONTAL
= 1;
291 Dygraph
.VERTICAL
= 2;
293 // Used for initializing annotation CSS rules only once.
294 Dygraph
.addedAnnotationCSS
= false;
296 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
297 // Labels is no longer a constructor parameter, since it's typically set
298 // directly from the data source. It also conains a name for the x-axis,
299 // which the previous constructor form did not.
300 if (labels
!== null) {
301 var new_labels
= ["Date"];
302 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
303 Dygraph
.update(attrs
, { 'labels': new_labels
});
305 this.__init__(div
, file
, attrs
);
309 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
310 * and context <canvas> inside of it. See the constructor for details.
312 * @param {Element} div the Element to render the graph into.
313 * @param {String | Function} file Source data
314 * @param {Object} attrs Miscellaneous other options
317 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
318 // Hack for IE: if we're using excanvas and the document hasn't finished
319 // loading yet (and hence may not have initialized whatever it needs to
320 // initialize), then keep calling this routine periodically until it has.
321 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
322 typeof(G_vmlCanvasManager
) != 'undefined' &&
323 document
.readyState
!= 'complete') {
325 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
329 // Support two-argument constructor
330 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
332 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
335 Dygraph
.error("Constructing dygraph with a non-existent div!");
339 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
341 // Copy the important bits into the object
342 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
345 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
346 this.previousVerticalX_
= -1;
347 this.fractions_
= attrs
.fractions
|| false;
348 this.dateWindow_
= attrs
.dateWindow
|| null;
350 this.is_initial_draw_
= true;
351 this.annotations_
= [];
353 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
354 this.zoomed_x_
= false;
355 this.zoomed_y_
= false;
357 // Clear the div. This ensure that, if multiple dygraphs are passed the same
358 // div, then only one will be drawn.
361 // For historical reasons, the 'width' and 'height' options trump all CSS
362 // rules _except_ for an explicit 'width' or 'height' on the div.
363 // As an added convenience, if the div has zero height (like <div></div> does
364 // without any styles), then we use a default height/width
.
365 if (div
.style
.width
=== '' && attrs
.width
) {
366 div
.style
.width
= attrs
.width
+ "px";
368 if (div
.style
.height
=== '' && attrs
.height
) {
369 div
.style
.height
= attrs
.height
+ "px";
371 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
372 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
373 if (div
.style
.width
=== '') {
374 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
377 // these will be zero if the dygraph's div is hidden.
378 this.width_
= div
.clientWidth
;
379 this.height_
= div
.clientHeight
;
381 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
382 if (attrs
.stackedGraph
) {
383 attrs
.fillGraph
= true;
384 // TODO(nikhilk): Add any other stackedGraph checks here.
387 // Dygraphs has many options, some of which interact with one another.
388 // To keep track of everything, we maintain two sets of options:
390 // this.user_attrs_ only options explicitly set by the user.
391 // this.attrs_ defaults, options derived from user_attrs_, data.
393 // Options are then accessed this.attr_('attr'), which first looks at
394 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
395 // defaults without overriding behavior that the user specifically asks for.
396 this.user_attrs_
= {};
397 Dygraph
.update(this.user_attrs_
, attrs
);
399 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
401 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
403 this.boundaryIds_
= [];
404 this.setIndexByName_
= {};
405 this.datasetIndex_
= [];
407 // Create the containing DIV and other interactive elements
408 this.createInterface_();
414 * Returns the zoomed status of the chart for one or both axes.
416 * Axis is an optional parameter. Can be set to 'x' or 'y'.
418 * The zoomed status for an axis is set whenever a user zooms using the mouse
419 * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom
420 * option is also specified).
422 Dygraph
.prototype.isZoomed
= function(axis
) {
423 if (axis
== null) return this.zoomed_x_
|| this.zoomed_y_
;
424 if (axis
=== 'x') return this.zoomed_x_
;
425 if (axis
=== 'y') return this.zoomed_y_
;
426 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
430 * Returns information about the Dygraph object, including its containing ID.
432 Dygraph
.prototype.toString
= function() {
433 var maindiv
= this.maindiv_
;
434 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
435 return "[Dygraph " + id
+ "]";
440 * Returns the value of an option. This may be set by the user (either in the
441 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
443 * @param { String } name The name of the option, e.g. 'rollPeriod'.
444 * @param { String } [seriesName] The name of the series to which the option
445 * will be applied. If no per-series value of this option is available, then
446 * the global value is returned. This is optional.
447 * @return { ... } The value of the option.
449 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
450 // <REMOVE_FOR_COMBINED>
451 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
452 this.error('Must include options reference JS for testing');
453 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
454 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
455 'in the Dygraphs.OPTIONS_REFERENCE listing.');
456 // Only log this error once.
457 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
459 // </REMOVE_FOR_COMBINED
>
462 sources
.push(this.attrs_
);
463 if (this.user_attrs_
) {
464 sources
.push(this.user_attrs_
);
466 if (this.user_attrs_
.hasOwnProperty(seriesName
)) {
467 sources
.push(this.user_attrs_
[seriesName
]);
469 if (seriesName
=== this.highlightSet_
&&
470 this.user_attrs_
.hasOwnProperty('highlightSeriesOpts')) {
471 sources
.push(this.user_attrs_
['highlightSeriesOpts']);
477 for (var i
= sources
.length
- 1; i
>= 0; --i
) {
478 var source
= sources
[i
];
479 if (source
.hasOwnProperty(name
)) {
489 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
490 * @return { ... } A function mapping string -> option value
492 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
494 return function(opt
) {
495 var axis_opts
= self
.user_attrs_
.axes
;
496 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
497 return axis_opts
[axis
][opt
];
499 // user-specified attributes always trump defaults, even if they're less
501 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
502 return self
.user_attrs_
[opt
];
505 axis_opts
= self
.attrs_
.axes
;
506 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
507 return axis_opts
[axis
][opt
];
509 // check old-style axis options
510 // TODO(danvk): add a deprecation warning if either of these match.
511 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
512 return self
.axes_
[0][opt
];
513 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
514 return self
.axes_
[1][opt
];
516 return self
.attr_(opt
);
521 * Returns the current rolling period, as set by the user or an option.
522 * @return {Number} The number of points in the rolling window
524 Dygraph
.prototype.rollPeriod
= function() {
525 return this.rollPeriod_
;
529 * Returns the currently-visible x-range. This can be affected by zooming,
530 * panning or a call to updateOptions.
531 * Returns a two-element array: [left, right].
532 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
534 Dygraph
.prototype.xAxisRange
= function() {
535 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
539 * Returns the lower- and upper-bound x-axis values of the
542 Dygraph
.prototype.xAxisExtremes
= function() {
543 var left
= this.rawData_
[0][0];
544 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
545 return [left
, right
];
549 * Returns the currently-visible y-range for an axis. This can be affected by
550 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
551 * called with no arguments, returns the range of the first axis.
552 * Returns a two-element array: [bottom, top].
554 Dygraph
.prototype.yAxisRange
= function(idx
) {
555 if (typeof(idx
) == "undefined") idx
= 0;
556 if (idx
< 0 || idx
>= this.axes_
.length
) {
559 var axis
= this.axes_
[idx
];
560 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
564 * Returns the currently-visible y-ranges for each axis. This can be affected by
565 * zooming, panning, calls to updateOptions, etc.
566 * Returns an array of [bottom, top] pairs, one for each y-axis.
568 Dygraph
.prototype.yAxisRanges
= function() {
570 for (var i
= 0; i
< this.axes_
.length
; i
++) {
571 ret
.push(this.yAxisRange(i
));
576 // TODO(danvk): use these functions throughout dygraphs.
578 * Convert from data coordinates to canvas/div X/Y coordinates.
579 * If specified, do this conversion for the coordinate system of a particular
580 * axis. Uses the first axis by default.
581 * Returns a two-element array: [X, Y]
583 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
584 * instead of toDomCoords(null, y, axis).
586 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
587 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
591 * Convert from data x coordinates to canvas/div X coordinate.
592 * If specified, do this conversion for the coordinate system of a particular
594 * Returns a single value or null if x is null.
596 Dygraph
.prototype.toDomXCoord
= function(x
) {
601 var area
= this.plotter_
.area
;
602 var xRange
= this.xAxisRange();
603 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
607 * Convert from data x coordinates to canvas/div Y coordinate and optional
608 * axis. Uses the first axis by default.
610 * returns a single value or null if y is null.
612 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
613 var pct
= this.toPercentYCoord(y
, axis
);
618 var area
= this.plotter_
.area
;
619 return area
.y
+ pct
* area
.h
;
623 * Convert from canvas/div coords to data coordinates.
624 * If specified, do this conversion for the coordinate system of a particular
625 * axis. Uses the first axis by default.
626 * Returns a two-element array: [X, Y].
628 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
629 * instead of toDataCoords(null, y, axis).
631 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
632 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
636 * Convert from canvas/div x coordinate to data coordinate.
638 * If x is null, this returns null.
640 Dygraph
.prototype.toDataXCoord
= function(x
) {
645 var area
= this.plotter_
.area
;
646 var xRange
= this.xAxisRange();
647 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
651 * Convert from canvas/div y coord to value.
653 * If y is null, this returns null.
654 * if axis is null, this uses the first axis.
656 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
661 var area
= this.plotter_
.area
;
662 var yRange
= this.yAxisRange(axis
);
664 if (typeof(axis
) == "undefined") axis
= 0;
665 if (!this.axes_
[axis
].logscale
) {
666 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
668 // Computing the inverse of toDomCoord.
669 var pct
= (y
- area
.y
) / area
.h
;
671 // Computing the inverse of toPercentYCoord. The function was arrived at with
672 // the following steps:
674 // Original calcuation:
675 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
677 // Move denominator to both sides:
678 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
680 // subtract logr1, and take the negative value.
681 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
683 // Swap both sides of the equation, and we can compute the log of the
684 // return value. Which means we just need to use that as the exponent in
686 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
688 var logr1
= Dygraph
.log10(yRange
[1]);
689 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
690 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
696 * Converts a y for an axis to a percentage from the top to the
697 * bottom of the drawing area.
699 * If the coordinate represents a value visible on the canvas, then
700 * the value will be between 0 and 1, where 0 is the top of the canvas.
701 * However, this method will return values outside the range, as
702 * values can fall outside the canvas.
704 * If y is null, this returns null.
705 * if axis is null, this uses the first axis.
707 * @param { Number } y The data y-coordinate.
708 * @param { Number } [axis] The axis number on which the data coordinate lives.
709 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
711 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
715 if (typeof(axis
) == "undefined") axis
= 0;
717 var yRange
= this.yAxisRange(axis
);
720 if (!this.axes_
[axis
].logscale
) {
721 // yRange[1] - y is unit distance from the bottom.
722 // yRange[1] - yRange[0] is the scale of the range.
723 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
724 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
726 var logr1
= Dygraph
.log10(yRange
[1]);
727 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
733 * Converts an x value to a percentage from the left to the right of
736 * If the coordinate represents a value visible on the canvas, then
737 * the value will be between 0 and 1, where 0 is the left of the canvas.
738 * However, this method will return values outside the range, as
739 * values can fall outside the canvas.
741 * If x is null, this returns null.
742 * @param { Number } x The data x-coordinate.
743 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
745 Dygraph
.prototype.toPercentXCoord
= function(x
) {
750 var xRange
= this.xAxisRange();
751 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
755 * Returns the number of columns (including the independent variable).
756 * @return { Integer } The number of columns.
758 Dygraph
.prototype.numColumns
= function() {
759 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
763 * Returns the number of rows (excluding any header/label row).
764 * @return { Integer } The number of rows, less any header.
766 Dygraph
.prototype.numRows
= function() {
767 return this.rawData_
.length
;
771 * Returns the full range of the x-axis, as determined by the most extreme
772 * values in the data set. Not affected by zooming, visibility, etc.
773 * TODO(danvk): merge w/ xAxisExtremes
774 * @return { Array<Number> } A [low, high] pair
777 Dygraph
.prototype.fullXRange_
= function() {
778 if (this.numRows() > 0) {
779 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
786 * Returns the value in the given row and column. If the row and column exceed
787 * the bounds on the data, returns null. Also returns null if the value is
789 * @param { Number} row The row number of the data (0-based). Row 0 is the
790 * first row of data, not a header row.
791 * @param { Number} col The column number of the data (0-based)
792 * @return { Number } The value in the specified cell or null if the row/col
795 Dygraph
.prototype.getValue
= function(row
, col
) {
796 if (row
< 0 || row
> this.rawData_
.length
) return null;
797 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
799 return this.rawData_
[row
][col
];
803 * Generates interface elements for the Dygraph: a containing div, a div to
804 * display the current point, and a textbox to adjust the rolling average
805 * period. Also creates the Renderer/Layout elements.
808 Dygraph
.prototype.createInterface_
= function() {
809 // Create the all-enclosing graph div
810 var enclosing
= this.maindiv_
;
812 this.graphDiv
= document
.createElement("div");
813 this.graphDiv
.style
.width
= this.width_
+ "px";
814 this.graphDiv
.style
.height
= this.height_
+ "px";
815 enclosing
.appendChild(this.graphDiv
);
817 // Create the canvas for interactive parts of the chart.
818 this.canvas_
= Dygraph
.createCanvas();
819 this.canvas_
.style
.position
= "absolute";
820 this.canvas_
.width
= this.width_
;
821 this.canvas_
.height
= this.height_
;
822 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
823 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
825 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
827 // ... and for static parts of the chart.
828 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
829 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
831 if (this.attr_('showRangeSelector')) {
832 // The range selector must be created here so that its canvases and contexts get created here.
833 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
834 // The range selector also sets xAxisHeight in order to reserve space.
835 this.rangeSelector_
= new DygraphRangeSelector(this);
838 // The interactive parts of the graph are drawn on top of the chart.
839 this.graphDiv
.appendChild(this.hidden_
);
840 this.graphDiv
.appendChild(this.canvas_
);
841 this.mouseEventElement_
= this.createMouseEventElement_();
843 // Create the grapher
844 this.layout_
= new DygraphLayout(this);
846 if (this.rangeSelector_
) {
847 // This needs to happen after the graph canvases are added to the div and the layout object is created.
848 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
853 this.mouseMoveHandler
= function(e
) {
854 dygraph
.mouseMove_(e
);
856 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
858 this.mouseOutHandler
= function(e
) {
859 dygraph
.mouseOut_(e
);
861 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
863 this.createStatusMessage_();
864 this.createDragInterface_();
866 this.resizeHandler
= function(e
) {
870 // Update when the window is resized.
871 // TODO(danvk): drop frames depending on complexity of the chart.
872 Dygraph
.addEvent(window
, 'resize', this.resizeHandler
);
876 * Detach DOM elements in the dygraph and null out all data references.
877 * Calling this when you're done with a dygraph can dramatically reduce memory
878 * usage. See, e.g., the tests/perf.html example.
880 Dygraph
.prototype.destroy
= function() {
881 var removeRecursive
= function(node
) {
882 while (node
.hasChildNodes()) {
883 removeRecursive(node
.firstChild
);
884 node
.removeChild(node
.firstChild
);
888 // remove mouse event handlers
889 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
890 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
891 removeRecursive(this.maindiv_
);
893 var nullOut
= function(obj
) {
895 if (typeof(obj
[n
]) === 'object') {
900 // remove event handlers
901 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
902 this.resizeHandler
= null;
903 // These may not all be necessary, but it can't hurt...
904 nullOut(this.layout_
);
905 nullOut(this.plotter_
);
910 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
911 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
912 * or the zoom rectangles) is done on this.canvas_.
913 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
914 * @return {Object} The newly-created canvas
917 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
918 var h
= Dygraph
.createCanvas();
919 h
.style
.position
= "absolute";
920 // TODO(danvk): h should be offset from canvas. canvas needs to include
921 // some extra area to make it easier to zoom in on the far left and far
922 // right. h needs to be precisely the plot area, so that clipping occurs.
923 h
.style
.top
= canvas
.style
.top
;
924 h
.style
.left
= canvas
.style
.left
;
925 h
.width
= this.width_
;
926 h
.height
= this.height_
;
927 h
.style
.width
= this.width_
+ "px"; // for IE
928 h
.style
.height
= this.height_
+ "px"; // for IE
933 * Creates an overlay element used to handle mouse events.
934 * @return {Object} The mouse event element.
937 Dygraph
.prototype.createMouseEventElement_
= function() {
938 if (this.isUsingExcanvas_
) {
939 var elem
= document
.createElement("div");
940 elem
.style
.position
= 'absolute';
941 elem
.style
.backgroundColor
= 'white';
942 elem
.style
.filter
= 'alpha(opacity=0)';
943 elem
.style
.width
= this.width_
+ "px";
944 elem
.style
.height
= this.height_
+ "px";
945 this.graphDiv
.appendChild(elem
);
953 * Generate a set of distinct colors for the data series. This is done with a
954 * color wheel. Saturation/Value are customizable, and the hue is
955 * equally-spaced around the color wheel. If a custom set of colors is
956 * specified, that is used instead.
959 Dygraph
.prototype.setColors_
= function() {
960 var num
= this.attr_("labels").length
- 1;
962 var colors
= this.attr_('colors');
965 var sat
= this.attr_('colorSaturation') || 1.0;
966 var val
= this.attr_('colorValue') || 0.5;
967 var half
= Math
.ceil(num
/ 2);
968 for (i
= 1; i
<= num
; i
++) {
969 if (!this.visibility()[i
-1]) continue;
970 // alternate colors for high contrast.
971 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
972 var hue
= (1.0 * idx
/ (1 + num
));
973 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
976 for (i
= 0; i
< num
; i
++) {
977 if (!this.visibility()[i
]) continue;
978 var colorStr
= colors
[i
% colors
.length
];
979 this.colors_
.push(colorStr
);
983 this.plotter_
.setColors(this.colors_
);
987 * Return the list of colors. This is either the list of colors passed in the
988 * attributes or the autogenerated list of rgb(r,g,b) strings.
989 * @return {Array<string>} The list of colors.
991 Dygraph
.prototype.getColors
= function() {
996 * Create the div that contains information on the selected point(s)
997 * This goes in the top right of the canvas, unless an external div has already
1001 Dygraph
.prototype.createStatusMessage_
= function() {
1002 var userLabelsDiv
= this.user_attrs_
.labelsDiv
;
1003 if (userLabelsDiv
&& null !== userLabelsDiv
&&
1004 (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
1005 this.user_attrs_
.labelsDiv
= document
.getElementById(userLabelsDiv
);
1007 if (!this.attr_("labelsDiv")) {
1008 var divWidth
= this.attr_('labelsDivWidth');
1009 var messagestyle
= {
1010 "position": "absolute",
1013 "width": divWidth
+ "px",
1015 "left": (this.width_
- divWidth
- 2) + "px",
1016 "background": "white",
1017 "textAlign": "left",
1018 "overflow": "hidden"};
1019 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
1020 var div
= document
.createElement("div");
1021 div
.className
= "dygraph-legend";
1022 for (var name
in messagestyle
) {
1023 if (messagestyle
.hasOwnProperty(name
)) {
1025 div
.style
[name
] = messagestyle
[name
];
1027 this.warn("You are using unsupported css properties for your browser in labelsDivStyles");
1031 this.graphDiv
.appendChild(div
);
1032 this.attrs_
.labelsDiv
= div
;
1037 * Position the labels div so that:
1038 * - its right edge is flush with the right edge of the charting area
1039 * - its top edge is flush with the top edge of the charting area
1042 Dygraph
.prototype.positionLabelsDiv_
= function() {
1043 // Don't touch a user-specified labelsDiv.
1044 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
1046 var area
= this.plotter_
.area
;
1047 var div
= this.attr_("labelsDiv");
1048 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
1049 div
.style
.top
= area
.y
+ "px";
1053 * Create the text box to adjust the averaging period
1056 Dygraph
.prototype.createRollInterface_
= function() {
1057 // Create a roller if one doesn't exist already.
1058 if (!this.roller_
) {
1059 this.roller_
= document
.createElement("input");
1060 this.roller_
.type
= "text";
1061 this.roller_
.style
.display
= "none";
1062 this.graphDiv
.appendChild(this.roller_
);
1065 var display
= this.attr_('showRoller') ? 'block' : 'none';
1067 var area
= this.plotter_
.area
;
1068 var textAttr
= { "position": "absolute",
1070 "top": (area
.y
+ area
.h
- 25) + "px",
1071 "left": (area
.x
+ 1) + "px",
1074 this.roller_
.size
= "2";
1075 this.roller_
.value
= this.rollPeriod_
;
1076 for (var name
in textAttr
) {
1077 if (textAttr
.hasOwnProperty(name
)) {
1078 this.roller_
.style
[name
] = textAttr
[name
];
1083 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1088 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1089 * canvas (i.e. DOM Coords).
1091 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1092 return Dygraph
.pageX(e
) - context
.px
;
1097 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1098 * canvas (i.e. DOM Coords).
1100 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1101 return Dygraph
.pageY(e
) - context
.py
;
1105 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1109 Dygraph
.prototype.createDragInterface_
= function() {
1111 // Tracks whether the mouse is down right now
1113 isPanning
: false, // is this drag part of a pan?
1114 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1115 dragStartX
: null, // pixel coordinates
1116 dragStartY
: null, // pixel coordinates
1117 dragEndX
: null, // pixel coordinates
1118 dragEndY
: null, // pixel coordinates
1119 dragDirection
: null,
1120 prevEndX
: null, // pixel coordinates
1121 prevEndY
: null, // pixel coordinates
1122 prevDragDirection
: null,
1124 // The value on the left side of the graph when a pan operation starts.
1125 initialLeftmostDate
: null,
1127 // The number of units each pixel spans. (This won't be valid for log
1129 xUnitsPerPixel
: null,
1131 // TODO(danvk): update this comment
1132 // The range in second/value units that the viewport encompasses during a
1133 // panning operation.
1136 // Top-left corner of the canvas, in DOM coords
1137 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1141 // Values for use with panEdgeFraction, which limit how far outside the
1142 // graph's data boundaries it can be panned.
1143 boundedDates
: null, // [minDate, maxDate]
1144 boundedValues
: null, // [[minValue, maxValue] ...]
1146 initializeMouseDown
: function(event
, g
, context
) {
1147 // prevents mouse drags from selecting page text.
1148 if (event
.preventDefault
) {
1149 event
.preventDefault(); // Firefox, Chrome, etc.
1151 event
.returnValue
= false; // IE
1152 event
.cancelBubble
= true;
1155 context
.px
= Dygraph
.findPosX(g
.canvas_
);
1156 context
.py
= Dygraph
.findPosY(g
.canvas_
);
1157 context
.dragStartX
= g
.dragGetX_(event
, context
);
1158 context
.dragStartY
= g
.dragGetY_(event
, context
);
1162 var interactionModel
= this.attr_("interactionModel");
1164 // Self is the graph.
1167 // Function that binds the graph and context to the handler.
1168 var bindHandler
= function(handler
) {
1169 return function(event
) {
1170 handler(event
, self
, context
);
1174 for (var eventName
in interactionModel
) {
1175 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1176 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
1177 bindHandler(interactionModel
[eventName
]));
1180 // If the user releases the mouse button during a drag, but not over the
1181 // canvas, then it doesn't count as a zooming action.
1182 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
1183 if (context
.isZooming
|| context
.isPanning
) {
1184 context
.isZooming
= false;
1185 context
.dragStartX
= null;
1186 context
.dragStartY
= null;
1189 if (context
.isPanning
) {
1190 context
.isPanning
= false;
1191 context
.draggingDate
= null;
1192 context
.dateRange
= null;
1193 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1194 delete self
.axes_
[i
].draggingValue
;
1195 delete self
.axes_
[i
].dragValueRange
;
1202 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1203 * up any previous zoom rectangles that were drawn. This could be optimized to
1204 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1207 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1208 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1209 * @param {Number} startX The X position where the drag started, in canvas
1211 * @param {Number} endX The current X position of the drag, in canvas coords.
1212 * @param {Number} startY The Y position where the drag started, in canvas
1214 * @param {Number} endY The current Y position of the drag, in canvas coords.
1215 * @param {Number} prevDirection the value of direction on the previous call to
1216 * this function. Used to avoid excess redrawing
1217 * @param {Number} prevEndX The value of endX on the previous call to this
1218 * function. Used to avoid excess redrawing
1219 * @param {Number} prevEndY The value of endY on the previous call to this
1220 * function. Used to avoid excess redrawing
1223 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1224 endY
, prevDirection
, prevEndX
,
1226 var ctx
= this.canvas_ctx_
;
1228 // Clean up from the previous rect if necessary
1229 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1230 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1231 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1232 } else if (prevDirection
== Dygraph
.VERTICAL
){
1233 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1234 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1237 // Draw a light-grey rectangle to show the new viewing area
1238 if (direction
== Dygraph
.HORIZONTAL
) {
1239 if (endX
&& startX
) {
1240 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1241 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1242 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1244 } else if (direction
== Dygraph
.VERTICAL
) {
1245 if (endY
&& startY
) {
1246 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1247 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1248 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1252 if (this.isUsingExcanvas_
) {
1253 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1258 * Clear the zoom rectangle (and perform no zoom).
1261 Dygraph
.prototype.clearZoomRect_
= function() {
1262 this.currentZoomRectArgs_
= null;
1263 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1267 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1268 * the canvas. The exact zoom window may be slightly larger if there are no data
1269 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1270 * which accepts dates that match the raw data. This function redraws the graph.
1272 * @param {Number} lowX The leftmost pixel value that should be visible.
1273 * @param {Number} highX The rightmost pixel value that should be visible.
1276 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1277 this.currentZoomRectArgs_
= null;
1278 // Find the earliest and latest dates contained in this canvasx range.
1279 // Convert the call to date ranges of the raw data.
1280 var minDate
= this.toDataXCoord(lowX
);
1281 var maxDate
= this.toDataXCoord(highX
);
1282 this.doZoomXDates_(minDate
, maxDate
);
1286 * Transition function to use in animations. Returns values between 0.0
1287 * (totally old values) and 1.0 (totally new values) for each frame.
1290 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1292 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1296 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1297 * method with doZoomX which accepts pixel coordinates. This function redraws
1300 * @param {Number} minDate The minimum date that should be visible.
1301 * @param {Number} maxDate The maximum date that should be visible.
1304 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1305 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1306 // can produce strange effects. Rather than the y-axis transitioning slowly
1307 // between values, it can jerk around.)
1308 var old_window
= this.xAxisRange();
1309 var new_window
= [minDate
, maxDate
];
1310 this.zoomed_x_
= true;
1312 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1313 if (that
.attr_("zoomCallback")) {
1314 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1320 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1321 * the canvas. This function redraws the graph.
1323 * @param {Number} lowY The topmost pixel value that should be visible.
1324 * @param {Number} highY The lowest pixel value that should be visible.
1327 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1328 this.currentZoomRectArgs_
= null;
1329 // Find the highest and lowest values in pixel range for each axis.
1330 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1331 // This is because pixels increase as you go down on the screen, whereas data
1332 // coordinates increase as you go up the screen.
1333 var oldValueRanges
= this.yAxisRanges();
1334 var newValueRanges
= [];
1335 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1336 var hi
= this.toDataYCoord(lowY
, i
);
1337 var low
= this.toDataYCoord(highY
, i
);
1338 newValueRanges
.push([low
, hi
]);
1341 this.zoomed_y_
= true;
1343 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1344 if (that
.attr_("zoomCallback")) {
1345 var xRange
= that
.xAxisRange();
1346 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1352 * Reset the zoom to the original view coordinates. This is the same as
1353 * double-clicking on the graph.
1357 Dygraph
.prototype.doUnzoom_
= function() {
1358 var dirty
= false, dirtyX
= false, dirtyY
= false;
1359 if (this.dateWindow_
!== null) {
1364 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1365 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1371 // Clear any selection, since it's likely to be drawn in the wrong place.
1372 this.clearSelection();
1375 this.zoomed_x_
= false;
1376 this.zoomed_y_
= false;
1378 var minDate
= this.rawData_
[0][0];
1379 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1381 // With only one frame, don't bother calculating extreme ranges.
1382 // TODO(danvk): merge this block w/ the code below
.
1383 if (!this.attr_("animatedZooms")) {
1384 this.dateWindow_
= null;
1385 for (i
= 0; i
< this.axes_
.length
; i
++) {
1386 if (this.axes_
[i
].valueWindow
!== null) {
1387 delete this.axes_
[i
].valueWindow
;
1391 if (this.attr_("zoomCallback")) {
1392 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1397 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1399 oldWindow
= this.xAxisRange();
1400 newWindow
= [minDate
, maxDate
];
1404 oldValueRanges
= this.yAxisRanges();
1405 // TODO(danvk): this is pretty inefficient
1406 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1407 var extremes
= packed
[1];
1409 // this has the side-effect of modifying this.axes_.
1410 // this doesn't make much sense in this context, but it's convenient (we
1411 // need this.axes_[*].extremeValues) and not harmful since we'll be
1412 // calling drawGraph_ shortly, which clobbers these values.
1413 this.computeYAxisRanges_(extremes
);
1415 newValueRanges
= [];
1416 for (i
= 0; i
< this.axes_
.length
; i
++) {
1417 var axis
= this.axes_
[i
];
1418 newValueRanges
.push(axis
.valueRange
!= null ? axis
.valueRange
: axis
.extremeRange
);
1423 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1425 that
.dateWindow_
= null;
1426 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1427 if (that
.axes_
[i
].valueWindow
!== null) {
1428 delete that
.axes_
[i
].valueWindow
;
1431 if (that
.attr_("zoomCallback")) {
1432 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1439 * Combined animation logic for all zoom functions.
1440 * either the x parameters or y parameters may be null.
1443 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1444 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1447 var valueRanges
= [];
1450 if (oldXRange
!== null && newXRange
!== null) {
1451 for (step
= 1; step
<= steps
; step
++) {
1452 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1453 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1454 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1458 if (oldYRanges
!== null && newYRanges
!== null) {
1459 for (step
= 1; step
<= steps
; step
++) {
1460 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1462 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1463 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1464 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1466 valueRanges
[step
-1] = thisRange
;
1471 Dygraph
.repeatAndCleanup(function(step
) {
1472 if (valueRanges
.length
) {
1473 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1474 var w
= valueRanges
[step
][i
];
1475 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1478 if (windows
.length
) {
1479 that
.dateWindow_
= windows
[step
];
1482 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1486 * Get the current graph's area object.
1488 * Returns: {x, y, w, h}
1490 Dygraph
.prototype.getArea
= function() {
1491 return this.plotter_
.area
;
1495 * Convert a mouse event to DOM coordinates relative to the graph origin.
1497 * Returns a two-element array: [X, Y].
1499 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1500 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1501 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1502 return [canvasx
, canvasy
];
1506 * Given a canvas X coordinate, find the closest row.
1507 * @param {Number} domX graph-relative DOM X coordinate
1508 * Returns: row number, integer
1511 Dygraph
.prototype.findClosestRow
= function(domX
) {
1512 var minDistX
= null;
1514 var points
= this.layout_
.points
;
1515 var l
= points
.length
;
1516 for (var i
= 0; i
< l
; i
++) {
1517 var point
= points
[i
];
1518 if (point
=== null) continue;
1519 var dist
= Math
.abs(point
.canvasx
- domX
);
1520 if (minDistX
!== null && dist
>= minDistX
) continue;
1524 return this.idxToRow_(idx
);
1528 * Given canvas X,Y coordinates, find the closest point.
1530 * This finds the individual data point across all visible series
1531 * that's closest to the supplied DOM coordinates using the standard
1532 * Euclidean X,Y distance.
1534 * @param {Number} domX graph-relative DOM X coordinate
1535 * @param {Number} domY graph-relative DOM Y coordinate
1536 * Returns: {row, seriesName, point}
1539 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1542 var points
= this.layout_
.points
;
1543 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1544 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1545 var first
= this.layout_
.setPointsOffsets
[setIdx
];
1546 var len
= this.layout_
.setPointsLengths
[setIdx
];
1547 for (var i
= 0; i
< len
; ++i
) {
1548 var point
= points
[first
+ i
];
1549 if (point
=== null) continue;
1550 dx
= point
.canvasx
- domX
;
1551 dy
= point
.canvasy
- domY
;
1552 dist
= dx
* dx
+ dy
* dy
;
1553 if (minDist
!== null && dist
>= minDist
) continue;
1555 closestPoint
= point
;
1556 closestSeries
= setIdx
;
1560 var name
= this.layout_
.setNames
[closestSeries
];
1569 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1571 * This first finds the X data point closest to the supplied DOM X coordinate,
1572 * then finds the series which puts the Y coordinate on top of its filled area,
1573 * using linear interpolation between adjacent point pairs.
1575 * @param {Number} domX graph-relative DOM X coordinate
1576 * @param {Number} domY graph-relative DOM Y coordinate
1577 * Returns: {row, seriesName, point}
1580 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1581 var row
= this.findClosestRow(domX
);
1582 var points
= this.layout_
.points
;
1583 var closestPoint
, closestSeries
;
1584 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1585 var first
= this.layout_
.setPointsOffsets
[setIdx
];
1586 var len
= this.layout_
.setPointsLengths
[setIdx
];
1587 if (row
>= len
) continue;
1588 var p1
= points
[first
+ row
];
1589 var py
= p1
.canvasy
;
1590 if (domX
> p1
.canvasx
&& row
+ 1 < len
) {
1591 // interpolate series Y value using next point
1592 var p2
= points
[first
+ row
+ 1];
1593 var dx
= p2
.canvasx
- p1
.canvasx
;
1595 var r
= (domX
- p1
.canvasx
) / dx
;
1596 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1598 } else if (domX
< p1
.canvasx
&& row
> 0) {
1599 // interpolate series Y value using previous point
1600 var p0
= points
[first
+ row
- 1];
1601 var dx
= p1
.canvasx
- p0
.canvasx
;
1603 var r
= (p1
.canvasx
- domX
) / dx
;
1604 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1607 // Stop if the point (domX, py) is above this series' upper edge
1608 if (setIdx
> 0 && py
>= domY
) break;
1610 closestSeries
= setIdx
;
1612 var name
= this.layout_
.setNames
[closestSeries
];
1621 * When the mouse moves in the canvas, display information about a nearby data
1622 * point and draw dots over those points in the data series. This function
1623 * takes care of cleanup of previously-drawn dots.
1624 * @param {Object} event The mousemove event from the browser.
1627 Dygraph
.prototype.mouseMove_
= function(event
) {
1628 // This prevents JS errors when mousing over the canvas before data loads.
1629 var points
= this.layout_
.points
;
1630 if (points
=== undefined
) return;
1632 var canvasCoords
= this.eventToDomCoords(event
);
1633 var canvasx
= canvasCoords
[0];
1634 var canvasy
= canvasCoords
[1];
1636 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1637 var selectionChanged
= false;
1638 if (highlightSeriesOpts
) {
1640 if (this.attr_("stackedGraph")) {
1641 closest
= this.findStackedPoint(canvasx
, canvasy
);
1643 closest
= this.findClosestPoint(canvasx
, canvasy
);
1645 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1647 var idx
= this.findClosestRow(canvasx
);
1648 selectionChanged
= this.setSelection(idx
);
1651 var callback
= this.attr_("highlightCallback");
1652 if (callback
&& selectionChanged
) {
1653 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1658 * Transforms layout_.points index into data row number.
1659 * @param int layout_.points index
1660 * @return int row number, or -1 if none could be found.
1663 Dygraph
.prototype.idxToRow_
= function(idx
) {
1664 if (idx
< 0) return -1;
1666 // make sure that you get the boundaryIds record which is also defined (see bug #236)
1667 var boundaryIdx
= -1;
1668 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1669 if (this.boundaryIds_
[i
] !== undefined
) {
1674 if (boundaryIdx
< 0) return -1;
1675 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1676 var set
= this.layout_
.datasets
[setIdx
];
1677 if (idx
< set
.length
) {
1678 return this.boundaryIds_
[boundaryIdx
][0] + idx
;
1687 * Generates legend html dash for any stroke pattern. It will try to scale the
1688 * pattern to fit in 1em width. Or if small enough repeat the partern for 1em
1690 * @param strokePattern The pattern
1691 * @param color The color of the series.
1692 * @param oneEmWidth The width in pixels of 1em in the legend.
1694 Dygraph
.prototype.generateLegendDashHTML_
= function(strokePattern
, color
, oneEmWidth
) {
1696 var i
, j
, paddingLeft
, marginRight
;
1697 var strokePixelLength
= 0, segmentLoop
= 0;
1698 var normalizedPattern
= [];
1700 // IE 7,8 fail at these divs, so they get boring legend, have not tested 9.
1701 var isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
1705 if (!strokePattern
|| strokePattern
.length
<= 1) {
1707 dash
= "<div style=\"display: inline-block; position: relative; " +
1708 "bottom: .5ex; padding-left: 1em; height: 1px; " +
1709 "border-bottom: 2px solid " + color
+ ";\"></div>";
1711 // Compute the length of the pixels including the first segment twice,
1712 // since we repeat it.
1713 for (i
= 0; i
<= strokePattern
.length
; i
++) {
1714 strokePixelLength
+= strokePattern
[i
%strokePattern
.length
];
1717 // See if we can loop the pattern by itself at least twice.
1718 loop
= Math
.floor(oneEmWidth
/(strokePixelLength
-strokePattern
[0]));
1720 // This pattern fits at least two times, no scaling just convert to em;
1721 for (i
= 0; i
< strokePattern
.length
; i
++) {
1722 normalizedPattern
[i
] = strokePattern
[i
]/oneEmWidth
;
1724 // Since we are repeating the pattern, we don't worry about repeating the
1725 // first segment in one draw.
1726 segmentLoop
= normalizedPattern
.length
;
1728 // If the pattern doesn't fit in the legend we scale it to fit.
1730 for (i
= 0; i
< strokePattern
.length
; i
++) {
1731 normalizedPattern
[i
] = strokePattern
[i
]/strokePixelLength
;
1733 // For the scaled patterns we do redraw the first segment.
1734 segmentLoop
= normalizedPattern
.length
+1;
1736 // Now make the pattern.
1737 for (j
= 0; j
< loop
; j
++) {
1738 for (i
= 0; i
< segmentLoop
; i
+=2) {
1739 // The padding is the drawn segment.
1740 paddingLeft
= normalizedPattern
[i
%normalizedPattern
.length
];
1741 if (i
< strokePattern
.length
) {
1742 // The margin is the space segment.
1743 marginRight
= normalizedPattern
[(i
+1)%normalizedPattern
.length
];
1745 // The repeated first segment has no right margin.
1748 dash
+= "<div style=\"display: inline-block; position: relative; " +
1749 "bottom: .5ex; margin-right: " + marginRight
+ "em; padding-left: " +
1750 paddingLeft
+ "em; height: 1px; border-bottom: 2px solid " + color
+
1760 * Generates HTML for the legend which is displayed when hovering over the
1761 * chart. If no selected points are specified, a default legend is returned
1762 * (this may just be the empty string).
1763 * @param { Number } [x] The x-value of the selected points.
1764 * @param { [Object] } [sel_points] List of selected points for the given
1765 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1766 * @param { Number } [oneEmWidth] The pixel width for 1em in the legend.
1768 Dygraph
.prototype.generateLegendHTML_
= function(x
, sel_points
, oneEmWidth
) {
1769 // If no points are selected, we display a default legend. Traditionally,
1770 // this has been blank. But a better default would be a conventional legend,
1771 // which provides essential information for a non-interactive chart.
1772 var html
, sepLines
, i
, c
, dash
, strokePattern
;
1773 if (typeof(x
) === 'undefined') {
1774 if (this.attr_('legend') != 'always') return '';
1776 sepLines
= this.attr_('labelsSeparateLines');
1777 var labels
= this.attr_('labels');
1779 for (i
= 1; i
< labels
.length
; i
++) {
1780 if (!this.visibility()[i
- 1]) continue;
1781 c
= this.plotter_
.colors
[labels
[i
]];
1782 if (html
!== '') html
+= (sepLines
? '<br/>' : ' ');
1783 strokePattern
= this.attr_("strokePattern", labels
[i
]);
1784 dash
= this.generateLegendDashHTML_(strokePattern
, c
, oneEmWidth
);
1785 html
+= "<span style='font-weight: bold; color: " + c
+ ";'>" + dash
+
1786 " " + labels
[i
] + "</span>";
1791 var xOptView
= this.optionsViewForAxis_('x');
1792 var xvf
= xOptView('valueFormatter');
1793 html
= xvf(x
, xOptView
, this.attr_('labels')[0], this) + ":";
1796 var num_axes
= this.numAxes();
1797 for (i
= 0; i
< num_axes
; i
++) {
1798 yOptViews
[i
] = this.optionsViewForAxis_('y' + (i
? 1 + i
: ''));
1800 var showZeros
= this.attr_("labelsShowZeroValues");
1801 sepLines
= this.attr_("labelsSeparateLines");
1802 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1803 var pt
= this.selPoints_
[i
];
1804 if (pt
.yval
=== 0 && !showZeros
) continue;
1805 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1806 if (sepLines
) html
+= "<br/>";
1808 var yOptView
= yOptViews
[this.seriesToAxisMap_
[pt
.name
]];
1809 var fmtFunc
= yOptView('valueFormatter');
1810 c
= this.plotter_
.colors
[pt
.name
];
1811 var yval
= fmtFunc(pt
.yval
, yOptView
, pt
.name
, this);
1813 var cls
= (pt
.name
== this.highlightSet_
) ? " class='highlight'" : "";
1814 // TODO(danvk): use a template string here and make it an attribute.
1815 html
+= "<span" + cls
+ ">" + " <b><span style='color: " + c
+ ";'>" + pt
.name
+
1816 "</span></b>:" + yval
+ "</span>";
1823 * Displays information about the selected points in the legend. If there is no
1824 * selection, the legend will be cleared.
1825 * @param { Number } [x] The x-value of the selected points.
1826 * @param { [Object] } [sel_points] List of selected points for the given
1827 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1829 Dygraph
.prototype.setLegendHTML_
= function(x
, sel_points
) {
1830 var labelsDiv
= this.attr_("labelsDiv");
1831 var sizeSpan
= document
.createElement('span');
1832 // Calculates the width of 1em in pixels for the legend.
1833 sizeSpan
.setAttribute('style', 'margin: 0; padding: 0 0 0 1em; border: 0;');
1834 labelsDiv
.appendChild(sizeSpan
);
1835 var oneEmWidth
=sizeSpan
.offsetWidth
;
1837 var html
= this.generateLegendHTML_(x
, sel_points
, oneEmWidth
);
1838 if (labelsDiv
!== null) {
1839 labelsDiv
.innerHTML
= html
;
1841 if (typeof(this.shown_legend_error_
) == 'undefined') {
1842 this.error('labelsDiv is set to something nonexistent; legend will not be shown.');
1843 this.shown_legend_error_
= true;
1848 Dygraph
.prototype.animateSelection_
= function(direction
) {
1849 var totalSteps
= 10;
1851 if (this.fadeLevel
=== undefined
) {
1855 var start
= this.fadeLevel
;
1856 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1858 if (this.fadeLevel
) {
1859 this.updateSelection_(1.0);
1864 var thisId
= ++this.animateId
;
1866 Dygraph
.repeatAndCleanup(
1868 // ignore simultaneous animations
1869 if (that
.animateId
!= thisId
) return;
1871 that
.fadeLevel
+= direction
;
1872 if (that
.fadeLevel
=== 0) {
1873 that
.clearSelection();
1875 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1878 steps
, millis
, function() {});
1882 * Draw dots over the selectied points in the data series. This function
1883 * takes care of cleanup of previously-drawn dots.
1886 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1887 // Clear the previously drawn vertical, if there is one
1889 var ctx
= this.canvas_ctx_
;
1890 if (this.attr_('highlightSeriesOpts')) {
1891 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1892 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1894 // Activating background fade includes an animation effect for a gradual
1895 // fade. TODO(klausw): make this independently configurable if it causes
1896 // issues? Use a shared preference to control animations?
1897 var animateBackgroundFade
= true;
1898 if (animateBackgroundFade
) {
1899 if (opt_animFraction
=== undefined
) {
1900 // start a new animation
1901 this.animateSelection_(1);
1904 alpha
*= opt_animFraction
;
1906 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1907 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1909 var setIdx
= this.datasetIndexFromSetName_(this.highlightSet_
);
1910 this.plotter_
._drawLine(ctx
, setIdx
);
1911 } else if (this.previousVerticalX_
>= 0) {
1912 // Determine the maximum highlight circle size.
1913 var maxCircleSize
= 0;
1914 var labels
= this.attr_('labels');
1915 for (i
= 1; i
< labels
.length
; i
++) {
1916 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1917 if (r
> maxCircleSize
) maxCircleSize
= r
;
1919 var px
= this.previousVerticalX_
;
1920 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1921 2 * maxCircleSize
+ 2, this.height_
);
1924 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1925 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1928 if (this.selPoints_
.length
> 0) {
1929 // Set the status message to indicate the selected point(s)
1930 if (this.attr_('showLabelsOnHighlight')) {
1931 this.setLegendHTML_(this.lastx_
, this.selPoints_
);
1934 // Draw colored circles over the center of each selected point
1935 var canvasx
= this.selPoints_
[0].canvasx
;
1937 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1938 var pt
= this.selPoints_
[i
];
1939 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1941 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1942 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1943 var color
= this.plotter_
.colors
[pt
.name
];
1945 callback
= Dygraph
.Circles
.DEFAULT
;
1947 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1948 ctx
.strokeStyle
= color
;
1949 ctx
.fillStyle
= color
;
1950 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1955 this.previousVerticalX_
= canvasx
;
1960 * Manually set the selected points and display information about them in the
1961 * legend. The selection can be cleared using clearSelection() and queried
1962 * using getSelection().
1963 * @param { Integer } row number that should be highlighted (i.e. appear with
1964 * hover dots on the chart). Set to false to clear any selection.
1965 * @param { seriesName } optional series name to highlight that series with the
1966 * the highlightSeriesOpts setting.
1968 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
) {
1969 // Extract the points we've selected
1970 this.selPoints_
= [];
1973 if (row
!== false) {
1974 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1975 if (this.boundaryIds_
[i
] !== undefined
) {
1976 row
-= this.boundaryIds_
[i
][0];
1982 var changed
= false;
1983 if (row
!== false && row
>= 0) {
1984 if (row
!= this.lastRow_
) changed
= true;
1985 this.lastRow_
= row
;
1986 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1987 var set
= this.layout_
.datasets
[setIdx
];
1988 if (row
< set
.length
) {
1989 var point
= this.layout_
.points
[pos
+row
];
1991 if (this.attr_("stackedGraph")) {
1992 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1995 this.selPoints_
.push(point
);
2000 if (this.lastRow_
>= 0) changed
= true;
2004 if (this.selPoints_
.length
) {
2005 this.lastx_
= this.selPoints_
[0].xval
;
2010 if (opt_seriesName
!== undefined
) {
2011 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
2012 this.highlightSet_
= opt_seriesName
;
2016 this.updateSelection_(undefined
);
2022 * The mouse has left the canvas. Clear out whatever artifacts remain
2023 * @param {Object} event the mouseout event from the browser.
2026 Dygraph
.prototype.mouseOut_
= function(event
) {
2027 if (this.attr_("unhighlightCallback")) {
2028 this.attr_("unhighlightCallback")(event
);
2031 if (this.attr_("hideOverlayOnMouseOut")) {
2032 this.clearSelection();
2037 * Clears the current selection (i.e. points that were highlighted by moving
2038 * the mouse over the chart).
2040 Dygraph
.prototype.clearSelection
= function() {
2041 // Get rid of the overlay data
2042 if (this.fadeLevel
) {
2043 this.animateSelection_(-1);
2046 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2048 this.setLegendHTML_();
2049 this.selPoints_
= [];
2052 this.highlightSet_
= null;
2056 * Returns the number of the currently selected row. To get data for this row,
2057 * you can use the getValue method.
2058 * @return { Integer } row number, or -1 if nothing is selected
2060 Dygraph
.prototype.getSelection
= function() {
2061 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2065 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
2066 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
2067 return row
+ this.boundaryIds_
[0][0];
2073 Dygraph
.prototype.getHighlightSeries
= function() {
2074 return this.highlightSet_
;
2078 * Fires when there's data available to be graphed.
2079 * @param {String} data Raw CSV data to be plotted
2082 Dygraph
.prototype.loadedEvent_
= function(data
) {
2083 this.rawData_
= this.parseCSV_(data
);
2088 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2091 Dygraph
.prototype.addXTicks_
= function() {
2092 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2094 if (this.dateWindow_
) {
2095 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2097 range
= this.fullXRange_();
2100 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2101 var xTicks
= xAxisOptionsView('ticker')(
2104 this.width_
, // TODO(danvk): should be area.width
2107 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2108 // console.log(msg);
2109 this.layout_
.setXTicks(xTicks
);
2114 * Computes the range of the data series (including confidence intervals).
2115 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2116 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2117 * @return [low, high]
2119 Dygraph
.prototype.extremeValues_
= function(series
) {
2120 var minY
= null, maxY
= null, j
, y
;
2122 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2124 // With custom bars, maxY is the max of the high values.
2125 for (j
= 0; j
< series
.length
; j
++) {
2126 y
= series
[j
][1][0];
2128 var low
= y
- series
[j
][1][1];
2129 var high
= y
+ series
[j
][1][2];
2130 if (low
> y
) low
= y
; // this can happen with custom bars,
2131 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2132 if (maxY
=== null || high
> maxY
) {
2135 if (minY
=== null || low
< minY
) {
2140 for (j
= 0; j
< series
.length
; j
++) {
2142 if (y
=== null || isNaN(y
)) continue;
2143 if (maxY
=== null || y
> maxY
) {
2146 if (minY
=== null || y
< minY
) {
2152 return [minY
, maxY
];
2157 * This function is called once when the chart's data is changed or the options
2158 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2159 * idea is that values derived from the chart's data can be computed here,
2160 * rather than every time the chart is drawn. This includes things like the
2161 * number of axes, rolling averages, etc.
2163 Dygraph
.prototype.predraw_
= function() {
2164 var start
= new Date();
2166 // TODO(danvk): move more computations out of drawGraph_ and into here.
2167 this.computeYAxes_();
2169 // Create a new plotter.
2170 if (this.plotter_
) this.plotter_
.clear();
2171 this.plotter_
= new DygraphCanvasRenderer(this,
2176 // The roller sits in the bottom left corner of the chart. We don't know where
2177 // this will be until the options are available, so it's positioned here.
2178 this.createRollInterface_();
2180 // Same thing applies for the labelsDiv. It's right edge should be flush with
2181 // the right edge of the charting area (which may not be the same as the right
2182 // edge of the div, if we have two y-axes.
2183 this.positionLabelsDiv_();
2185 if (this.rangeSelector_
) {
2186 this.rangeSelector_
.renderStaticLayer();
2189 // Convert the raw data (a 2D array) into the internal format and compute
2190 // rolling averages.
2191 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2192 for (var i
= 1; i
< this.numColumns(); i
++) {
2193 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
2194 var logScale
= this.attr_('logscale', i
);
2195 var series
= this.extractSeries_(this.rawData_
, i
, logScale
, connectSeparatedPoints
);
2196 series
= this.rollingAverage(series
, this.rollPeriod_
);
2197 this.rolledSeries_
.push(series
);
2200 // If the data or options have changed, then we'd better redraw.
2203 // This is used to determine whether to do various animations.
2204 var end
= new Date();
2205 this.drawingTimeMs_
= (end
- start
);
2209 * Loop over all fields and create datasets, calculating extreme y-values for
2210 * each series and extreme x-indices as we go.
2212 * dateWindow is passed in as an explicit parameter so that we can compute
2213 * extreme values "speculatively", i.e. without actually setting state on the
2216 * TODO(danvk): make this more of a true function
2217 * @return [ datasets, seriesExtremes, boundaryIds ]
2220 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2221 var boundaryIds
= [];
2222 var cumulative_y
= []; // For stacked series.
2224 var extremes
= {}; // series name -> [low, high]
2227 // Loop over the fields (series). Go from the last to the first,
2228 // because if they're stacked that's how we accumulate the values.
2229 var num_series
= rolledSeries
.length
- 1;
2230 for (i
= num_series
; i
>= 1; i
--) {
2231 if (!this.visibility()[i
- 1]) continue;
2233 // TODO(danvk): is this copy really necessary?
2235 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2236 series
.push(rolledSeries
[i
][j
]);
2239 // Prune down to the desired range, if necessary (for zooming)
2240 // Because there can be lines going to points outside of the visible area,
2241 // we actually prune to visible points, plus one on either side.
2242 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2244 var low
= dateWindow
[0];
2245 var high
= dateWindow
[1];
2247 // TODO(danvk): do binary search instead of linear search.
2248 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2249 var firstIdx
= null, lastIdx
= null;
2250 for (k
= 0; k
< series
.length
; k
++) {
2251 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2254 if (series
[k
][0] <= high
) {
2258 if (firstIdx
=== null) firstIdx
= 0;
2259 if (firstIdx
> 0) firstIdx
--;
2260 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2261 if (lastIdx
< series
.length
- 1) lastIdx
++;
2262 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2263 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2264 pruned
.push(series
[k
]);
2268 boundaryIds
[i
-1] = [0, series
.length
-1];
2271 var seriesExtremes
= this.extremeValues_(series
);
2274 for (j
=0; j
<series
.length
; j
++) {
2275 series
[j
] = [series
[j
][0],
2280 } else if (this.attr_("stackedGraph")) {
2281 var l
= series
.length
;
2283 for (j
= 0; j
< l
; j
++) {
2284 // If one data set has a NaN, let all subsequent stacked
2285 // sets inherit the NaN -- only start at 0 for the first set.
2286 var x
= series
[j
][0];
2287 if (cumulative_y
[x
] === undefined
) {
2288 cumulative_y
[x
] = 0;
2291 actual_y
= series
[j
][1];
2292 cumulative_y
[x
] += actual_y
;
2294 series
[j
] = [x
, cumulative_y
[x
]];
2296 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2297 seriesExtremes
[1] = cumulative_y
[x
];
2299 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2300 seriesExtremes
[0] = cumulative_y
[x
];
2305 var seriesName
= this.attr_("labels")[i
];
2306 extremes
[seriesName
] = seriesExtremes
;
2307 datasets
[i
] = series
;
2310 return [ datasets
, extremes
, boundaryIds
];
2314 * Update the graph with new data. This method is called when the viewing area
2315 * has changed. If the underlying data or options have changed, predraw_ will
2316 * be called before drawGraph_ is called.
2318 * clearSelection, when undefined or true, causes this.clearSelection to be
2319 * called at the end of the draw operation. This should rarely be defined,
2320 * and never true (that is it should be undefined most of the time, and
2325 Dygraph
.prototype.drawGraph_
= function(clearSelection
) {
2326 var start
= new Date();
2328 if (typeof(clearSelection
) === 'undefined') {
2329 clearSelection
= true;
2332 // This is used to set the second parameter to drawCallback, below.
2333 var is_initial_draw
= this.is_initial_draw_
;
2334 this.is_initial_draw_
= false;
2336 this.layout_
.removeAllDatasets();
2338 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2340 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2341 var datasets
= packed
[0];
2342 var extremes
= packed
[1];
2343 this.boundaryIds_
= packed
[2];
2345 this.setIndexByName_
= {};
2346 var labels
= this.attr_("labels");
2347 if (labels
.length
> 0) {
2348 this.setIndexByName_
[labels
[0]] = 0;
2351 for (var i
= 1; i
< datasets
.length
; i
++) {
2352 this.setIndexByName_
[labels
[i
]] = i
;
2353 if (!this.visibility()[i
- 1]) continue;
2354 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2355 this.datasetIndex_
[i
] = dataIdx
++;
2358 this.computeYAxisRanges_(extremes
);
2359 this.layout_
.setYAxes(this.axes_
);
2363 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2364 var tmp_zoomed_x
= this.zoomed_x_
;
2365 // Tell PlotKit to use this new data and render itself
2366 this.layout_
.setDateWindow(this.dateWindow_
);
2367 this.zoomed_x_
= tmp_zoomed_x
;
2368 this.layout_
.evaluateWithError();
2369 this.renderGraph_(is_initial_draw
, false);
2371 if (this.attr_("timingName")) {
2372 var end
= new Date();
2374 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2379 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
, clearSelection
) {
2380 this.plotter_
.clear();
2381 this.plotter_
.render();
2382 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2383 this.canvas_
.height
);
2385 // Generate a static legend before any particular point is selected.
2386 this.setLegendHTML_();
2388 if (!is_initial_draw
) {
2389 if (clearSelection
) {
2390 if (typeof(this.selPoints_
) !== 'undefined' && this.selPoints_
.length
) {
2391 // We should select the point nearest the page x/y here
, but it
's easier
2392 // to just clear the selection. This prevents erroneous hover dots from
2394 this.clearSelection();
2396 this.clearSelection();
2401 if (this.rangeSelector_) {
2402 this.rangeSelector_.renderInteractiveLayer();
2405 if (this.attr_("drawCallback") !== null) {
2406 this.attr_("drawCallback")(this, is_initial_draw);
2412 * Determine properties of the y-axes which are independent of the data
2413 * currently being displayed. This includes things like the number of axes and
2414 * the style of the axes. It does not include the range of each axis and its
2416 * This fills in this.axes_ and this.seriesToAxisMap_.
2417 * axes_ = [ { options } ]
2418 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2419 * indices are into the axes_ array.
2421 Dygraph.prototype.computeYAxes_ = function() {
2422 // Preserve valueWindow settings if they exist, and if the user hasn't
2423 // specified a new valueRange.
2424 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2425 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2427 for (index
= 0; index
< this.axes_
.length
; index
++) {
2428 valueWindows
.push(this.axes_
[index
].valueWindow
);
2432 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2433 this.seriesToAxisMap_
= {};
2435 // Get a list of series names.
2436 var labels
= this.attr_("labels");
2438 for (i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2440 // all options which could be applied per-axis:
2448 'axisLabelFontSize',
2453 // Copy global axis options over to the first axis.
2454 for (i
= 0; i
< axisOptions
.length
; i
++) {
2455 var k
= axisOptions
[i
];
2457 if (v
) this.axes_
[0][k
] = v
;
2460 // Go through once and add all the axes.
2461 for (seriesName
in series
) {
2462 if (!series
.hasOwnProperty(seriesName
)) continue;
2463 axis
= this.attr_("axis", seriesName
);
2464 if (axis
=== null) {
2465 this.seriesToAxisMap_
[seriesName
] = 0;
2468 if (typeof(axis
) == 'object') {
2469 // Add a new axis, making a copy of its per-axis options.
2471 Dygraph
.update(opts
, this.axes_
[0]);
2472 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2473 var yAxisId
= this.axes_
.length
;
2474 opts
.yAxisId
= yAxisId
;
2476 Dygraph
.update(opts
, axis
);
2477 this.axes_
.push(opts
);
2478 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2482 // Go through one more time and assign series to an axis defined by another
2483 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2484 for (seriesName
in series
) {
2485 if (!series
.hasOwnProperty(seriesName
)) continue;
2486 axis
= this.attr_("axis", seriesName
);
2487 if (typeof(axis
) == 'string') {
2488 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2489 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2490 "series " + axis
+ ", which does not define its own axis.");
2493 var idx
= this.seriesToAxisMap_
[axis
];
2494 this.seriesToAxisMap_
[seriesName
] = idx
;
2498 if (valueWindows
!== undefined
) {
2499 // Restore valueWindow settings.
2500 for (index
= 0; index
< valueWindows
.length
; index
++) {
2501 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2506 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2508 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2509 v
= opts("valueRange");
2510 if (v
) this.axes_
[axis
].valueRange
= v
;
2511 } else { // To keep old behavior
2512 var axes
= this.user_attrs_
.axes
;
2513 if (axes
&& axes
.y2
) {
2514 v
= axes
.y2
.valueRange
;
2515 if (v
) this.axes_
[axis
].valueRange
= v
;
2523 * Returns the number of y-axes on the chart.
2524 * @return {Number} the number of axes.
2526 Dygraph
.prototype.numAxes
= function() {
2528 for (var series
in this.seriesToAxisMap_
) {
2529 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2530 var idx
= this.seriesToAxisMap_
[series
];
2531 if (idx
> last_axis
) last_axis
= idx
;
2533 return 1 + last_axis
;
2538 * Returns axis properties for the given series.
2539 * @param { String } setName The name of the series for which to get axis
2540 * properties, e.g. 'Y1'.
2541 * @return { Object } The axis properties.
2543 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2544 // TODO(danvk): handle errors.
2545 return this.axes_
[this.seriesToAxisMap_
[series
]];
2550 * Determine the value range and tick marks for each axis.
2551 * @param {Object} extremes A mapping from seriesName -> [low, high]
2552 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2554 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2555 // Build a map from axis number -> [list of series names]
2556 var seriesForAxis
= [], series
;
2557 for (series
in this.seriesToAxisMap_
) {
2558 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2559 var idx
= this.seriesToAxisMap_
[series
];
2560 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2561 seriesForAxis
[idx
].push(series
);
2564 // Compute extreme values, a span and tick marks for each axis.
2565 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2566 var axis
= this.axes_
[i
];
2568 if (!seriesForAxis
[i
]) {
2569 // If no series are defined or visible then use a reasonable default
2570 axis
.extremeRange
= [0, 1];
2572 // Calculate the extremes of extremes.
2573 series
= seriesForAxis
[i
];
2574 var minY
= Infinity
; // extremes[series[0]][0];
2575 var maxY
= -Infinity
; // extremes[series[0]][1];
2576 var extremeMinY
, extremeMaxY
;
2578 for (var j
= 0; j
< series
.length
; j
++) {
2579 // this skips invisible series
2580 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2582 // Only use valid extremes to stop null data series' from corrupting the scale.
2583 extremeMinY
= extremes
[series
[j
]][0];
2584 if (extremeMinY
!== null) {
2585 minY
= Math
.min(extremeMinY
, minY
);
2587 extremeMaxY
= extremes
[series
[j
]][1];
2588 if (extremeMaxY
!== null) {
2589 maxY
= Math
.max(extremeMaxY
, maxY
);
2592 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2594 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2595 if (minY
== Infinity
) minY
= 0;
2596 if (maxY
== -Infinity
) maxY
= 1;
2598 // Add some padding and round up to an integer to be human-friendly.
2599 var span
= maxY
- minY
;
2600 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2601 if (span
=== 0) { span
= maxY
; }
2603 var maxAxisY
, minAxisY
;
2604 if (axis
.logscale
) {
2605 maxAxisY
= maxY
+ 0.1 * span
;
2608 maxAxisY
= maxY
+ 0.1 * span
;
2609 minAxisY
= minY
- 0.1 * span
;
2611 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2612 if (!this.attr_("avoidMinZero")) {
2613 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2614 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2617 if (this.attr_("includeZero")) {
2618 if (maxY
< 0) maxAxisY
= 0;
2619 if (minY
> 0) minAxisY
= 0;
2622 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2624 if (axis
.valueWindow
) {
2625 // This is only set if the user has zoomed on the y-axis. It is never set
2626 // by a user. It takes precedence over axis.valueRange because, if you set
2627 // valueRange, you'd still expect to be able to pan.
2628 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2629 } else if (axis
.valueRange
) {
2630 // This is a user-set value range for this axis.
2631 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2633 axis
.computedValueRange
= axis
.extremeRange
;
2636 // Add ticks. By default, all axes inherit the tick positions of the
2637 // primary axis. However, if an axis is specifically marked as having
2638 // independent ticks, then that is permissible as well.
2639 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2640 var ticker
= opts('ticker');
2641 if (i
=== 0 || axis
.independentTicks
) {
2642 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2643 axis
.computedValueRange
[1],
2644 this.height_
, // TODO(danvk): should be area.height
2648 var p_axis
= this.axes_
[0];
2649 var p_ticks
= p_axis
.ticks
;
2650 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2651 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2652 var tick_values
= [];
2653 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2654 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2655 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2656 tick_values
.push(y_val
);
2659 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2660 axis
.computedValueRange
[1],
2661 this.height_
, // TODO(danvk): should be area.height
2670 * Extracts one series from the raw data (a 2D array) into an array of (date,
2673 * This is where undesirable points (i.e. negative values on log scales and
2674 * missing values through which we wish to connect lines) are dropped.
2678 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
, connectSeparatedPoints
) {
2680 for (var j
= 0; j
< rawData
.length
; j
++) {
2681 var x
= rawData
[j
][0];
2682 var point
= rawData
[j
][i
];
2684 // On the log scale, points less than zero do not exist.
2685 // This will create a gap in the chart. Note that this ignores
2686 // connectSeparatedPoints.
2690 series
.push([x
, point
]);
2692 if (point
!== null || !connectSeparatedPoints
) {
2693 series
.push([x
, point
]);
2702 * Calculates the rolling average of a data set.
2703 * If originalData is [label, val], rolls the average of those.
2704 * If originalData is [label, [, it's interpreted as [value, stddev]
2705 * and the roll is returned in the same form, with appropriately reduced
2706 * stddev for each value.
2707 * Note that this is where fractional input (i.e. '5/10') is converted into
2709 * @param {Array} originalData The data in the appropriate format (see above)
2710 * @param {Number} rollPeriod The number of points over which to average the
2713 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2714 if (originalData
.length
< 2)
2715 return originalData
;
2716 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2717 var rollingData
= [];
2718 var sigma
= this.attr_("sigma");
2720 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2721 if (this.fractions_
) {
2723 var den
= 0; // numerator/denominator
2725 for (i
= 0; i
< originalData
.length
; i
++) {
2726 num
+= originalData
[i
][1][0];
2727 den
+= originalData
[i
][1][1];
2728 if (i
- rollPeriod
>= 0) {
2729 num
-= originalData
[i
- rollPeriod
][1][0];
2730 den
-= originalData
[i
- rollPeriod
][1][1];
2733 var date
= originalData
[i
][0];
2734 var value
= den
? num
/ den
: 0.0;
2735 if (this.attr_("errorBars")) {
2736 if (this.attr_("wilsonInterval")) {
2737 // For more details on this confidence interval, see:
2738 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2740 var p
= value
< 0 ? 0 : value
, n
= den
;
2741 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2742 var denom
= 1 + sigma
* sigma
/ den
;
2743 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2744 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2745 rollingData
[i
] = [date
,
2746 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2748 rollingData
[i
] = [date
, [0, 0, 0]];
2751 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2752 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2755 rollingData
[i
] = [date
, mult
* value
];
2758 } else if (this.attr_("customBars")) {
2763 for (i
= 0; i
< originalData
.length
; i
++) {
2764 var data
= originalData
[i
][1];
2766 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2768 if (y
!== null && !isNaN(y
)) {
2774 if (i
- rollPeriod
>= 0) {
2775 var prev
= originalData
[i
- rollPeriod
];
2776 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2784 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2785 1.0 * (mid
- low
) / count
,
2786 1.0 * (high
- mid
) / count
]];
2788 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2792 // Calculate the rolling average for the first rollPeriod - 1 points where
2793 // there is not enough data to roll over the full number of points
2794 if (!this.attr_("errorBars")){
2795 if (rollPeriod
== 1) {
2796 return originalData
;
2799 for (i
= 0; i
< originalData
.length
; i
++) {
2802 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2803 y
= originalData
[j
][1];
2804 if (y
=== null || isNaN(y
)) continue;
2806 sum
+= originalData
[j
][1];
2809 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2811 rollingData
[i
] = [originalData
[i
][0], null];
2816 for (i
= 0; i
< originalData
.length
; i
++) {
2820 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2821 y
= originalData
[j
][1][0];
2822 if (y
=== null || isNaN(y
)) continue;
2824 sum
+= originalData
[j
][1][0];
2825 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2828 stddev
= Math
.sqrt(variance
) / num_ok
;
2829 rollingData
[i
] = [originalData
[i
][0],
2830 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2832 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2842 * Detects the type of the str (date or numeric) and sets the various
2843 * formatting attributes in this.attrs_ based on this type.
2844 * @param {String} str An x value.
2847 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2849 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2850 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2851 str
.indexOf('/') >= 0 ||
2852 isNaN(parseFloat(str
))) {
2854 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2855 // TODO(danvk): remove support for this format.
2860 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2861 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2862 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2863 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2865 /** @private (shut up, jsdoc!) */
2866 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2867 // TODO(danvk): use Dygraph.numberValueFormatter here?
2868 /** @private (shut up, jsdoc!) */
2869 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2870 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2871 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2876 * Parses the value as a floating point number. This is like the parseFloat()
2877 * built-in, but with a few differences:
2878 * - the empty string is parsed as null, rather than NaN.
2879 * - if the string cannot be parsed at all, an error is logged.
2880 * If the string can't be parsed, this method returns null.
2881 * @param {String} x The string to be parsed
2882 * @param {Number} opt_line_no The line number from which the string comes.
2883 * @param {String} opt_line The text of the line from which the string comes.
2887 // Parse the x as a float or return null if it's not a number.
2888 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2889 var val
= parseFloat(x
);
2890 if (!isNaN(val
)) return val
;
2892 // Try to figure out what happeend.
2893 // If the value is the empty string, parse it as null.
2894 if (/^ *$/.test(x
)) return null;
2896 // If it was actually "NaN", return it as NaN.
2897 if (/^ *nan *$/i.test(x
)) return NaN
;
2899 // Looks like a parsing error.
2900 var msg
= "Unable to parse '" + x
+ "' as a number";
2901 if (opt_line
!== null && opt_line_no
!== null) {
2902 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2911 * Parses a string in a special csv format. We expect a csv file where each
2912 * line is a date point, and the first field in each line is the date string.
2913 * We also expect that all remaining fields represent series.
2914 * if the errorBars attribute is set, then interpret the fields as:
2915 * date, series1, stddev1, series2, stddev2, ...
2916 * @param {[Object]} data See above.
2918 * @return [Object] An array with one entry for each row. These entries
2919 * are an array of cells in that row. The first entry is the parsed x-value for
2920 * the row. The second, third, etc. are the y-values. These can take on one of
2921 * three forms, depending on the CSV and constructor parameters:
2923 * 2. [ value, stddev ]
2924 * 3. [ low value, center value, high value ]
2926 Dygraph
.prototype.parseCSV_
= function(data
) {
2928 var lines
= data
.split("\n");
2931 // Use the default delimiter or fall back to a tab if that makes sense.
2932 var delim
= this.attr_('delimiter');
2933 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2938 if (!('labels' in this.user_attrs_
)) {
2939 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2941 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2946 var defaultParserSet
= false; // attempt to auto-detect x value type
2947 var expectedCols
= this.attr_("labels").length
;
2948 var outOfOrder
= false;
2949 for (var i
= start
; i
< lines
.length
; i
++) {
2950 var line
= lines
[i
];
2952 if (line
.length
=== 0) continue; // skip blank lines
2953 if (line
[0] == '#') continue; // skip comment lines
2954 var inFields
= line
.split(delim
);
2955 if (inFields
.length
< 2) continue;
2958 if (!defaultParserSet
) {
2959 this.detectTypeFromString_(inFields
[0]);
2960 xParser
= this.attr_("xValueParser");
2961 defaultParserSet
= true;
2963 fields
[0] = xParser(inFields
[0], this);
2965 // If fractions are expected, parse the numbers as "A/B
"
2966 if (this.fractions_) {
2967 for (j = 1; j < inFields.length; j++) {
2968 // TODO(danvk): figure out an appropriate way to flag parse errors.
2969 vals = inFields[j].split("/");
2970 if (vals.length != 2) {
2971 this.error('Expected fractional "num
/den
" values in CSV data ' +
2972 "but found a value
'" + inFields[j] + "' on line
" +
2973 (1 + i) + " ('" + line + "') which is not of
this form
.");
2976 fields[j] = [this.parseFloat_(vals[0], i, line),
2977 this.parseFloat_(vals[1], i, line)];
2980 } else if (this.attr_("errorBars
")) {
2981 // If there are error bars, values are (value, stddev) pairs
2982 if (inFields.length % 2 != 1) {
2983 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2984 'but line ' + (1 + i) + ' has an odd number of values (' +
2985 (inFields.length - 1) + "): '" + line + "'");
2987 for (j = 1; j < inFields.length; j += 2) {
2988 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2989 this.parseFloat_(inFields[j + 1], i, line)];
2991 } else if (this.attr_("customBars
")) {
2992 // Bars are a low;center;high tuple
2993 for (j = 1; j < inFields.length; j++) {
2994 var val = inFields[j];
2995 if (/^ *$/.test(val)) {
2996 fields[j] = [null, null, null];
2998 vals = val.split(";");
2999 if (vals.length == 3) {
3000 fields[j] = [ this.parseFloat_(vals[0], i, line),
3001 this.parseFloat_(vals[1], i, line),
3002 this.parseFloat_(vals[2], i, line) ];
3004 this.warn('When using customBars, values must be either blank ' +
3005 'or "low
;center
;high
" tuples (got "' + val +
3006 '" on line ' + (1+i));
3011 // Values are just numbers
3012 for (j = 1; j < inFields.length; j++) {
3013 fields[j] = this.parseFloat_(inFields[j], i, line);
3016 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
3020 if (fields.length != expectedCols) {
3021 this.error("Number of columns
in line
" + i + " (" + fields.length +
3022 ") does not agree
with number of
labels (" + expectedCols +
3026 // If the user specified the 'labels' option and none of the cells of the
3027 // first row parsed correctly, then they probably double-specified the
3028 // labels. We go with the values set in the option, discard this row and
3029 // log a warning to the JS console.
3030 if (i === 0 && this.attr_('labels')) {
3031 var all_null = true;
3032 for (j = 0; all_null && j < fields.length; j++) {
3033 if (fields[j]) all_null = false;
3036 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3037 "CSV
data ('" + line + "') appears to also contain labels
. " +
3038 "Will drop the CSV labels and
use the option labels
.");
3046 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3047 ret.sort(function(a,b) { return a[0] - b[0]; });
3055 * The user has provided their data as a pre-packaged JS array. If the x values
3056 * are numeric, this is the same as dygraphs' internal format. If the x values
3057 * are dates, we need to convert them from Date objects to ms since epoch.
3058 * @param {[Object]} data
3059 * @return {[Object]} data with numeric x values.
3061 Dygraph.prototype.parseArray_ = function(data) {
3062 // Peek at the first x value to see if it's numeric.
3063 if (data.length === 0) {
3064 this.error("Can
't plot empty data set");
3067 if (data[0].length === 0) {
3068 this.error("Data set cannot contain an empty row");
3073 if (this.attr_("labels") === null) {
3074 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3075 "in the options parameter");
3076 this.attrs_.labels = [ "X" ];
3077 for (i = 1; i < data[0].length; i++) {
3078 this.attrs_.labels.push("Y" + i);
3082 if (Dygraph.isDateLike(data[0][0])) {
3083 // Some intelligent defaults for a date x-axis.
3084 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3085 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3086 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3088 // Assume they're all dates
.
3089 var parsedData
= Dygraph
.clone(data
);
3090 for (i
= 0; i
< data
.length
; i
++) {
3091 if (parsedData
[i
].length
=== 0) {
3092 this.error("Row " + (1 + i
) + " of data is empty");
3095 if (parsedData
[i
][0] === null ||
3096 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3097 isNaN(parsedData
[i
][0].getTime())) {
3098 this.error("x value in row " + (1 + i
) + " is not a Date");
3101 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3105 // Some intelligent defaults for a numeric x-axis.
3106 /** @private (shut up, jsdoc!) */
3107 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3108 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3109 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
3115 * Parses a DataTable object from gviz.
3116 * The data is expected to have a first column that is either a date or a
3117 * number. All subsequent columns must be numbers. If there is a clear mismatch
3118 * between this.xValueParser_ and the type of the first column, it will be
3119 * fixed. Fills out rawData_.
3120 * @param {[Object]} data See above.
3123 Dygraph
.prototype.parseDataTable_
= function(data
) {
3124 var shortTextForAnnotationNum
= function(num
) {
3125 // converts [0-9]+ [A-Z][a-z]*
3126 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3127 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3128 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3129 num
= Math
.floor(num
/ 26);
3131 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3132 num
= Math
.floor((num
- 1) / 26);
3137 var cols
= data
.getNumberOfColumns();
3138 var rows
= data
.getNumberOfRows();
3140 var indepType
= data
.getColumnType(0);
3141 if (indepType
== 'date' || indepType
== 'datetime') {
3142 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3143 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3144 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3145 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3146 } else if (indepType
== 'number') {
3147 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3148 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3149 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
3150 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3152 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3153 "column 1 of DataTable input (Got '" + indepType
+ "')");
3157 // Array of the column indices which contain data (and not annotations).
3159 var annotationCols
= {}; // data index -> [annotation cols]
3160 var hasAnnotations
= false;
3162 for (i
= 1; i
< cols
; i
++) {
3163 var type
= data
.getColumnType(i
);
3164 if (type
== 'number') {
3166 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3167 // This is OK -- it's an annotation column.
3168 var dataIdx
= colIdx
[colIdx
.length
- 1];
3169 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3170 annotationCols
[dataIdx
] = [i
];
3172 annotationCols
[dataIdx
].push(i
);
3174 hasAnnotations
= true;
3176 this.error("Only 'number' is supported as a dependent type with Gviz." +
3177 " 'string' is only supported if displayAnnotations is true");
3181 // Read column labels
3182 // TODO(danvk): add support back for errorBars
3183 var labels
= [data
.getColumnLabel(0)];
3184 for (i
= 0; i
< colIdx
.length
; i
++) {
3185 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3186 if (this.attr_("errorBars")) i
+= 1;
3188 this.attrs_
.labels
= labels
;
3189 cols
= labels
.length
;
3192 var outOfOrder
= false;
3193 var annotations
= [];
3194 for (i
= 0; i
< rows
; i
++) {
3196 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3197 data
.getValue(i
, 0) === null) {
3198 this.warn("Ignoring row " + i
+
3199 " of DataTable because of undefined or null first column.");
3203 if (indepType
== 'date' || indepType
== 'datetime') {
3204 row
.push(data
.getValue(i
, 0).getTime());
3206 row
.push(data
.getValue(i
, 0));
3208 if (!this.attr_("errorBars")) {
3209 for (j
= 0; j
< colIdx
.length
; j
++) {
3210 var col
= colIdx
[j
];
3211 row
.push(data
.getValue(i
, col
));
3212 if (hasAnnotations
&&
3213 annotationCols
.hasOwnProperty(col
) &&
3214 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3216 ann
.series
= data
.getColumnLabel(col
);
3218 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3220 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3221 if (k
) ann
.text
+= "\n";
3222 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3224 annotations
.push(ann
);
3228 // Strip out infinities, which give dygraphs problems later on.
3229 for (j
= 0; j
< row
.length
; j
++) {
3230 if (!isFinite(row
[j
])) row
[j
] = null;
3233 for (j
= 0; j
< cols
- 1; j
++) {
3234 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3237 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3244 this.warn("DataTable is out of order; order it correctly to speed loading.");
3245 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3247 this.rawData_
= ret
;
3249 if (annotations
.length
> 0) {
3250 this.setAnnotations(annotations
, true);
3255 * Get the CSV data. If it's in a function, call that function. If it's in a
3256 * file, do an XMLHttpRequest to get it.
3259 Dygraph
.prototype.start_
= function() {
3260 var data
= this.file_
;
3262 // Functions can return references of all other types.
3263 if (typeof data
== 'function') {
3267 if (Dygraph
.isArrayLike(data
)) {
3268 this.rawData_
= this.parseArray_(data
);
3270 } else if (typeof data
== 'object' &&
3271 typeof data
.getColumnRange
== 'function') {
3272 // must be a DataTable from gviz.
3273 this.parseDataTable_(data
);
3275 } else if (typeof data
== 'string') {
3276 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3277 if (data
.indexOf('\n') >= 0) {
3278 this.loadedEvent_(data
);
3280 var req
= new XMLHttpRequest();
3282 req
.onreadystatechange
= function () {
3283 if (req
.readyState
== 4) {
3284 if (req
.status
=== 200 || // Normal http
3285 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3286 caller
.loadedEvent_(req
.responseText
);
3291 req
.open("GET", data
, true);
3295 this.error("Unknown data format: " + (typeof data
));
3300 * Changes various properties of the graph. These can include:
3302 * <li>file: changes the source data for the graph</li>
3303 * <li>errorBars: changes whether the data contains stddev</li>
3306 * There's a huge variety of options that can be passed to this method. For a
3307 * full list, see http://dygraphs.com/options.html.
3309 * @param {Object} attrs The new properties and values
3310 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3311 * call to updateOptions(). If you know better, you can pass true to explicitly
3312 * block the redraw. This can be useful for chaining updateOptions() calls,
3313 * avoiding the occasional infinite loop and preventing redraws when it's not
3314 * necessary (e.g. when updating a callback).
3316 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3317 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3319 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3320 var file
= input_attrs
.file
;
3321 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3323 // TODO(danvk): this is a mess. Move these options into attr_.
3324 if ('rollPeriod' in attrs
) {
3325 this.rollPeriod_
= attrs
.rollPeriod
;
3327 if ('dateWindow' in attrs
) {
3328 this.dateWindow_
= attrs
.dateWindow
;
3329 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3330 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3333 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3334 this.zoomed_y_
= (attrs
.valueRange
!== null);
3337 // TODO(danvk): validate per-series options.
3342 // highlightCircleSize
3344 // Check if this set options will require new points.
3345 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3347 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3351 if (!block_redraw
) this.start_();
3353 if (!block_redraw
) {
3354 if (requiresNewPoints
) {
3357 this.renderGraph_(false, false);
3364 * Returns a copy of the options with deprecated names converted into current
3365 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3366 * interested in that, they should save a copy before calling this.
3369 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3371 for (var k
in attrs
) {
3372 if (k
== 'file') continue;
3373 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3376 var set
= function(axis
, opt
, value
) {
3377 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3378 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3379 my_attrs
.axes
[axis
][opt
] = value
;
3381 var map
= function(opt
, axis
, new_opt
) {
3382 if (typeof(attrs
[opt
]) != 'undefined') {
3383 set(axis
, new_opt
, attrs
[opt
]);
3384 delete my_attrs
[opt
];
3388 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3389 map('xValueFormatter', 'x', 'valueFormatter');
3390 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3391 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3392 map('xTicker', 'x', 'ticker');
3393 map('yValueFormatter', 'y', 'valueFormatter');
3394 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3395 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3396 map('yTicker', 'y', 'ticker');
3401 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3402 * containing div (which has presumably changed size since the dygraph was
3403 * instantiated. If the width/height are specified, the div will be resized.
3405 * This is far more efficient than destroying and re-instantiating a
3406 * Dygraph, since it doesn't have to reparse the underlying data.
3408 * @param {Number} [width] Width (in pixels)
3409 * @param {Number} [height] Height (in pixels)
3411 Dygraph
.prototype.resize
= function(width
, height
) {
3412 if (this.resize_lock
) {
3415 this.resize_lock
= true;
3417 if ((width
=== null) != (height
=== null)) {
3418 this.warn("Dygraph.resize() should be called with zero parameters or " +
3419 "two non-NULL parameters. Pretending it was zero.");
3420 width
= height
= null;
3423 var old_width
= this.width_
;
3424 var old_height
= this.height_
;
3427 this.maindiv_
.style
.width
= width
+ "px";
3428 this.maindiv_
.style
.height
= height
+ "px";
3429 this.width_
= width
;
3430 this.height_
= height
;
3432 this.width_
= this.maindiv_
.clientWidth
;
3433 this.height_
= this.maindiv_
.clientHeight
;
3436 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3437 // TODO(danvk): there should be a clear() method.
3438 this.maindiv_
.innerHTML
= "";
3439 this.roller_
= null;
3440 this.attrs_
.labelsDiv
= null;
3441 this.createInterface_();
3442 if (this.annotations_
.length
) {
3443 // createInterface_ reset the layout, so we need to do this.
3444 this.layout_
.setAnnotations(this.annotations_
);
3449 this.resize_lock
= false;
3453 * Adjusts the number of points in the rolling average. Updates the graph to
3454 * reflect the new averaging period.
3455 * @param {Number} length Number of points over which to average the data.
3457 Dygraph
.prototype.adjustRoll
= function(length
) {
3458 this.rollPeriod_
= length
;
3463 * Returns a boolean array of visibility statuses.
3465 Dygraph
.prototype.visibility
= function() {
3466 // Do lazy-initialization, so that this happens after we know the number of
3468 if (!this.attr_("visibility")) {
3469 this.attrs_
.visibility
= [];
3471 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3472 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3473 this.attrs_
.visibility
.push(true);
3475 return this.attr_("visibility");
3479 * Changes the visiblity of a series.
3481 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3482 var x
= this.visibility();
3483 if (num
< 0 || num
>= x
.length
) {
3484 this.warn("invalid series number in setVisibility: " + num
);
3492 * How large of an area will the dygraph render itself in?
3493 * This is used for testing.
3494 * @return A {width: w, height: h} object.
3497 Dygraph
.prototype.size
= function() {
3498 return { width
: this.width_
, height
: this.height_
};
3502 * Update the list of annotations and redraw the chart.
3503 * See dygraphs.com/annotations.html for more info on how to use annotations.
3504 * @param ann {Array} An array of annotation objects.
3505 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3507 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3508 // Only add the annotation CSS rule once we know it will be used.
3509 Dygraph
.addAnnotationRule();
3510 this.annotations_
= ann
;
3511 this.layout_
.setAnnotations(this.annotations_
);
3512 if (!suppressDraw
) {
3518 * Return the list of annotations.
3520 Dygraph
.prototype.annotations
= function() {
3521 return this.annotations_
;
3525 * Get the list of label names for this graph. The first column is the
3526 * x-axis, so the data series names start at index 1.
3528 Dygraph
.prototype.getLabels
= function(name
) {
3529 return this.attr_("labels").slice();
3533 * Get the index of a series (column) given its name. The first column is the
3534 * x-axis, so the data series start with index 1.
3536 Dygraph
.prototype.indexFromSetName
= function(name
) {
3537 return this.setIndexByName_
[name
];
3541 * Get the internal dataset index given its name. These are numbered starting from 0,
3542 * and only count visible sets.
3545 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3546 return this.datasetIndex_
[this.indexFromSetName(name
)];
3551 * Adds a default style for the annotation CSS classes to the document. This is
3552 * only executed when annotations are actually used. It is designed to only be
3553 * called once -- all calls after the first will return immediately.
3555 Dygraph
.addAnnotationRule
= function() {
3556 if (Dygraph
.addedAnnotationCSS
) return;
3558 var rule
= "border: 1px solid black; " +
3559 "background-color: white; " +
3560 "text-align: center;";
3562 var styleSheetElement
= document
.createElement("style");
3563 styleSheetElement
.type
= "text/css";
3564 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3566 // Find the first style sheet that we can access.
3567 // We may not add a rule to a style sheet from another domain for security
3568 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3569 // adds its own style sheets from google.com.
3570 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3571 if (document
.styleSheets
[i
].disabled
) continue;
3572 var mysheet
= document
.styleSheets
[i
];
3574 if (mysheet
.insertRule
) { // Firefox
3575 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3576 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3577 } else if (mysheet
.addRule
) { // IE
3578 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3580 Dygraph
.addedAnnotationCSS
= true;
3583 // Was likely a security exception.
3587 this.warn("Unable to add default annotation CSS rule; display may be off.");
3590 // Older pages may still use this name.
3591 var DateGraph
= Dygraph
;