3 * Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
8 * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
9 * string. Dygraph can handle multiple series with or without error bars. The
10 * date/value ranges will be automatically set. Dygraph uses the
11 * <canvas> tag, so it only works in FF1.5+.
12 * @author danvdk@gmail.com (Dan Vanderkam)
15 <div id="graphdiv" style="width:800px; height:500px;"></div>
16 <script type="text/javascript">
17 new Dygraph(document.getElementById("graphdiv"),
18 "datafile.csv", // CSV file with headers
22 The CSV file is of the form
24 Date,SeriesA,SeriesB,SeriesC
28 If the 'errorBars' option is set in the constructor, the input should be of
30 Date,SeriesA,SeriesB,...
31 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
32 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
34 If the 'fractions' option is set, the input should be of the form:
36 Date,SeriesA,SeriesB,...
37 YYYYMMDD,A1/B1,A2/B2,...
38 YYYYMMDD,A1/B1,A2/B2,...
40 And error bars will be calculated automatically using a binomial distribution.
42 For further documentation and examples, see http://dygraphs.com/
46 /*jshint globalstrict: true */
47 /*global DygraphRangeSelector:false, DygraphLayout:false, DygraphCanvasRenderer:false, G_vmlCanvasManager:false */
51 * Creates an interactive, zoomable chart.
54 * @param {div | String} div A div or the id of a div into which to construct
56 * @param {String | Function} file A file containing CSV data or a function
57 * that returns this data. The most basic expected format for each line is
58 * "YYYY/MM/DD,val1,val2,...". For more information, see
59 * http://dygraphs.com/data.html.
60 * @param {Object} attrs Various other attributes, e.g. errorBars determines
61 * whether the input data contains error ranges. For a complete list of
62 * options, see http://dygraphs.com/options.html.
64 var Dygraph
= function(div
, data
, opts
) {
65 if (arguments
.length
> 0) {
66 if (arguments
.length
== 4) {
67 // Old versions of dygraphs took in the series labels as a constructor
68 // parameter. This doesn't make sense anymore, but it's easy to continue
69 // to support this usage.
70 this.warn("Using deprecated four-argument dygraph constructor");
71 this.__old_init__(div
, data
, arguments
[2], arguments
[3]);
73 this.__init__(div
, data
, opts
);
78 Dygraph
.NAME
= "Dygraph";
79 Dygraph
.VERSION
= "1.2";
80 Dygraph
.__repr__
= function() {
81 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
85 * Returns information about the Dygraph class.
87 Dygraph
.toString
= function() {
88 return this.__repr__();
91 // Various default values
92 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
93 Dygraph
.DEFAULT_WIDTH
= 480;
94 Dygraph
.DEFAULT_HEIGHT
= 320;
96 Dygraph
.ANIMATION_STEPS
= 10;
97 Dygraph
.ANIMATION_DURATION
= 200;
99 // These are defined before DEFAULT_ATTRS so that it can refer to them.
102 * Return a string version of a number. This respects the digitsAfterDecimal
103 * and maxNumberWidth options.
104 * @param {Number} x The number to be formatted
105 * @param {Dygraph} opts An options view
106 * @param {String} name The name of the point's data series
107 * @param {Dygraph} g The dygraph object
109 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
110 var sigFigs
= opts('sigFigs');
112 if (sigFigs
!== null) {
113 // User has opted for a fixed number of significant figures.
114 return Dygraph
.floatFormat(x
, sigFigs
);
117 var digits
= opts('digitsAfterDecimal');
118 var maxNumberWidth
= opts('maxNumberWidth');
120 // switch to scientific notation if we underflow or overflow fixed display.
122 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
123 Math
.abs(x
) < Math
.pow(10, -digits
))) {
124 return x
.toExponential(digits
);
126 return '' + Dygraph
.round_(x
, digits
);
131 * variant for use as an axisLabelFormatter.
134 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
135 return Dygraph
.numberValueFormatter(x
, opts
, g
);
139 * Convert a JS date (millis since epoch) to YYYY/MM/DD
140 * @param {Number} date The JavaScript date (ms since epoch)
141 * @return {String} A date of the form "YYYY/MM/DD"
144 Dygraph
.dateString_
= function(date
) {
145 var zeropad
= Dygraph
.zeropad
;
146 var d
= new Date(date
);
149 var year
= "" + d
.getFullYear();
150 // Get a 0 padded month string
151 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
152 // Get a 0 padded day string
153 var day
= zeropad(d
.getDate());
156 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
157 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
159 return year
+ "/" + month + "/" + day
+ ret
;
163 * Convert a JS date to a string appropriate to display on an axis that
164 * is displaying values at the stated granularity.
165 * @param {Date} date The date to format
166 * @param {Number} granularity One of the Dygraph granularity constants
167 * @return {String} The formatted date
170 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
171 if (granularity
>= Dygraph
.DECADAL
) {
172 return date
.strftime('%Y');
173 } else if (granularity
>= Dygraph
.MONTHLY
) {
174 return date
.strftime('%b %y');
176 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
177 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
178 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
180 return Dygraph
.hmsString_(date
.getTime());
186 // Default attribute values.
187 Dygraph
.DEFAULT_ATTRS
= {
188 highlightCircleSize
: 3,
189 highlightSeriesOpts
: null,
190 highlightSeriesBackgroundFade
: 0,
191 highlightSeriesAnimated
: false,
195 // TODO(danvk): move defaults from createStatusMessage_ here.
197 labelsSeparateLines
: false,
198 labelsShowZeroValues
: true,
201 showLabelsOnHighlight
: true,
203 digitsAfterDecimal
: 2,
208 strokeBorderWidth
: 0,
209 strokeBorderColor
: "white",
212 axisLabelFontSize
: 14,
218 xValueParser
: Dygraph
.dateParser
,
225 wilsonInterval
: true, // only relevant if fractions is true
229 connectSeparatedPoints
: false,
232 hideOverlayOnMouseOut
: true,
234 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
235 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
240 // Sizes of the various chart labels.
247 axisLineColor
: "black",
250 axisLabelColor
: "black",
251 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
255 gridLineColor
: "rgb(128,128,128)",
257 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
258 animatedZooms
: false, // (for now)
260 // Range selector options
261 showRangeSelector
: false,
262 rangeSelectorHeight
: 40,
263 rangeSelectorPlotStrokeColor
: "#808FAB",
264 rangeSelectorPlotFillColor
: "#A7B1C4",
270 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
271 valueFormatter
: Dygraph
.dateString_
,
272 ticker
: null // will be set in dygraph-tickers.js
276 valueFormatter
: Dygraph
.numberValueFormatter
,
277 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
278 ticker
: null // will be set in dygraph-tickers.js
282 valueFormatter
: Dygraph
.numberValueFormatter
,
283 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
284 ticker
: null // will be set in dygraph-tickers.js
289 // Directions for panning and zooming. Use bit operations when combined
290 // values are possible.
291 Dygraph
.HORIZONTAL
= 1;
292 Dygraph
.VERTICAL
= 2;
294 // Used for initializing annotation CSS rules only once.
295 Dygraph
.addedAnnotationCSS
= false;
297 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
298 // Labels is no longer a constructor parameter, since it's typically set
299 // directly from the data source. It also conains a name for the x-axis,
300 // which the previous constructor form did not.
301 if (labels
!== null) {
302 var new_labels
= ["Date"];
303 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
304 Dygraph
.update(attrs
, { 'labels': new_labels
});
306 this.__init__(div
, file
, attrs
);
310 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
311 * and context <canvas> inside of it. See the constructor for details.
313 * @param {Element} div the Element to render the graph into.
314 * @param {String | Function} file Source data
315 * @param {Object} attrs Miscellaneous other options
318 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
319 // Hack for IE: if we're using excanvas and the document hasn't finished
320 // loading yet (and hence may not have initialized whatever it needs to
321 // initialize), then keep calling this routine periodically until it has.
322 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
323 typeof(G_vmlCanvasManager
) != 'undefined' &&
324 document
.readyState
!= 'complete') {
326 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
330 // Support two-argument constructor
331 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
333 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
336 Dygraph
.error("Constructing dygraph with a non-existent div!");
340 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
342 // Copy the important bits into the object
343 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
346 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
347 this.previousVerticalX_
= -1;
348 this.fractions_
= attrs
.fractions
|| false;
349 this.dateWindow_
= attrs
.dateWindow
|| null;
351 this.is_initial_draw_
= true;
352 this.annotations_
= [];
354 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
355 this.zoomed_x_
= false;
356 this.zoomed_y_
= false;
358 // Clear the div. This ensure that, if multiple dygraphs are passed the same
359 // div, then only one will be drawn.
362 // For historical reasons, the 'width' and 'height' options trump all CSS
363 // rules _except_ for an explicit 'width' or 'height' on the div.
364 // As an added convenience, if the div has zero height (like <div></div> does
365 // without any styles), then we use a default height/width
.
366 if (div
.style
.width
=== '' && attrs
.width
) {
367 div
.style
.width
= attrs
.width
+ "px";
369 if (div
.style
.height
=== '' && attrs
.height
) {
370 div
.style
.height
= attrs
.height
+ "px";
372 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
373 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
374 if (div
.style
.width
=== '') {
375 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
378 // these will be zero if the dygraph's div is hidden.
379 this.width_
= div
.clientWidth
;
380 this.height_
= div
.clientHeight
;
382 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
383 if (attrs
.stackedGraph
) {
384 attrs
.fillGraph
= true;
385 // TODO(nikhilk): Add any other stackedGraph checks here.
388 // Dygraphs has many options, some of which interact with one another.
389 // To keep track of everything, we maintain two sets of options:
391 // this.user_attrs_ only options explicitly set by the user.
392 // this.attrs_ defaults, options derived from user_attrs_, data.
394 // Options are then accessed this.attr_('attr'), which first looks at
395 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
396 // defaults without overriding behavior that the user specifically asks for.
397 this.user_attrs_
= {};
398 Dygraph
.update(this.user_attrs_
, attrs
);
400 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
402 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
404 this.boundaryIds_
= [];
405 this.setIndexByName_
= {};
406 this.datasetIndex_
= [];
408 // Create the containing DIV and other interactive elements
409 this.createInterface_();
415 * Returns the zoomed status of the chart for one or both axes.
417 * Axis is an optional parameter. Can be set to 'x' or 'y'.
419 * The zoomed status for an axis is set whenever a user zooms using the mouse
420 * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom
421 * option is also specified).
423 Dygraph
.prototype.isZoomed
= function(axis
) {
424 if (axis
== null) return this.zoomed_x_
|| this.zoomed_y_
;
425 if (axis
=== 'x') return this.zoomed_x_
;
426 if (axis
=== 'y') return this.zoomed_y_
;
427 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
431 * Returns information about the Dygraph object, including its containing ID.
433 Dygraph
.prototype.toString
= function() {
434 var maindiv
= this.maindiv_
;
435 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
436 return "[Dygraph " + id
+ "]";
441 * Returns the value of an option. This may be set by the user (either in the
442 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
444 * @param { String } name The name of the option, e.g. 'rollPeriod'.
445 * @param { String } [seriesName] The name of the series to which the option
446 * will be applied. If no per-series value of this option is available, then
447 * the global value is returned. This is optional.
448 * @return { ... } The value of the option.
450 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
451 // <REMOVE_FOR_COMBINED>
452 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
453 this.error('Must include options reference JS for testing');
454 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
455 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
456 'in the Dygraphs.OPTIONS_REFERENCE listing.');
457 // Only log this error once.
458 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
460 // </REMOVE_FOR_COMBINED
>
463 sources
.push(this.attrs_
);
464 if (this.user_attrs_
) {
465 sources
.push(this.user_attrs_
);
467 if (this.user_attrs_
.hasOwnProperty(seriesName
)) {
468 sources
.push(this.user_attrs_
[seriesName
]);
470 if (seriesName
=== this.highlightSet_
&&
471 this.user_attrs_
.hasOwnProperty('highlightSeriesOpts')) {
472 sources
.push(this.user_attrs_
['highlightSeriesOpts']);
478 for (var i
= sources
.length
- 1; i
>= 0; --i
) {
479 var source
= sources
[i
];
480 if (source
.hasOwnProperty(name
)) {
490 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
491 * @return { ... } A function mapping string -> option value
493 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
495 return function(opt
) {
496 var axis_opts
= self
.user_attrs_
.axes
;
497 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
498 return axis_opts
[axis
][opt
];
500 // user-specified attributes always trump defaults, even if they're less
502 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
503 return self
.user_attrs_
[opt
];
506 axis_opts
= self
.attrs_
.axes
;
507 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
508 return axis_opts
[axis
][opt
];
510 // check old-style axis options
511 // TODO(danvk): add a deprecation warning if either of these match.
512 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
513 return self
.axes_
[0][opt
];
514 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
515 return self
.axes_
[1][opt
];
517 return self
.attr_(opt
);
522 * Returns the current rolling period, as set by the user or an option.
523 * @return {Number} The number of points in the rolling window
525 Dygraph
.prototype.rollPeriod
= function() {
526 return this.rollPeriod_
;
530 * Returns the currently-visible x-range. This can be affected by zooming,
531 * panning or a call to updateOptions.
532 * Returns a two-element array: [left, right].
533 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
535 Dygraph
.prototype.xAxisRange
= function() {
536 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
540 * Returns the lower- and upper-bound x-axis values of the
543 Dygraph
.prototype.xAxisExtremes
= function() {
544 var left
= this.rawData_
[0][0];
545 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
546 return [left
, right
];
550 * Returns the currently-visible y-range for an axis. This can be affected by
551 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
552 * called with no arguments, returns the range of the first axis.
553 * Returns a two-element array: [bottom, top].
555 Dygraph
.prototype.yAxisRange
= function(idx
) {
556 if (typeof(idx
) == "undefined") idx
= 0;
557 if (idx
< 0 || idx
>= this.axes_
.length
) {
560 var axis
= this.axes_
[idx
];
561 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
565 * Returns the currently-visible y-ranges for each axis. This can be affected by
566 * zooming, panning, calls to updateOptions, etc.
567 * Returns an array of [bottom, top] pairs, one for each y-axis.
569 Dygraph
.prototype.yAxisRanges
= function() {
571 for (var i
= 0; i
< this.axes_
.length
; i
++) {
572 ret
.push(this.yAxisRange(i
));
577 // TODO(danvk): use these functions throughout dygraphs.
579 * Convert from data coordinates to canvas/div X/Y coordinates.
580 * If specified, do this conversion for the coordinate system of a particular
581 * axis. Uses the first axis by default.
582 * Returns a two-element array: [X, Y]
584 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
585 * instead of toDomCoords(null, y, axis).
587 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
588 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
592 * Convert from data x coordinates to canvas/div X coordinate.
593 * If specified, do this conversion for the coordinate system of a particular
595 * Returns a single value or null if x is null.
597 Dygraph
.prototype.toDomXCoord
= function(x
) {
602 var area
= this.plotter_
.area
;
603 var xRange
= this.xAxisRange();
604 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
608 * Convert from data x coordinates to canvas/div Y coordinate and optional
609 * axis. Uses the first axis by default.
611 * returns a single value or null if y is null.
613 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
614 var pct
= this.toPercentYCoord(y
, axis
);
619 var area
= this.plotter_
.area
;
620 return area
.y
+ pct
* area
.h
;
624 * Convert from canvas/div coords to data coordinates.
625 * If specified, do this conversion for the coordinate system of a particular
626 * axis. Uses the first axis by default.
627 * Returns a two-element array: [X, Y].
629 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
630 * instead of toDataCoords(null, y, axis).
632 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
633 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
637 * Convert from canvas/div x coordinate to data coordinate.
639 * If x is null, this returns null.
641 Dygraph
.prototype.toDataXCoord
= function(x
) {
646 var area
= this.plotter_
.area
;
647 var xRange
= this.xAxisRange();
648 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
652 * Convert from canvas/div y coord to value.
654 * If y is null, this returns null.
655 * if axis is null, this uses the first axis.
657 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
662 var area
= this.plotter_
.area
;
663 var yRange
= this.yAxisRange(axis
);
665 if (typeof(axis
) == "undefined") axis
= 0;
666 if (!this.axes_
[axis
].logscale
) {
667 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
669 // Computing the inverse of toDomCoord.
670 var pct
= (y
- area
.y
) / area
.h
;
672 // Computing the inverse of toPercentYCoord. The function was arrived at with
673 // the following steps:
675 // Original calcuation:
676 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
678 // Move denominator to both sides:
679 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
681 // subtract logr1, and take the negative value.
682 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
684 // Swap both sides of the equation, and we can compute the log of the
685 // return value. Which means we just need to use that as the exponent in
687 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
689 var logr1
= Dygraph
.log10(yRange
[1]);
690 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
691 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
697 * Converts a y for an axis to a percentage from the top to the
698 * bottom of the drawing area.
700 * If the coordinate represents a value visible on the canvas, then
701 * the value will be between 0 and 1, where 0 is the top of the canvas.
702 * However, this method will return values outside the range, as
703 * values can fall outside the canvas.
705 * If y is null, this returns null.
706 * if axis is null, this uses the first axis.
708 * @param { Number } y The data y-coordinate.
709 * @param { Number } [axis] The axis number on which the data coordinate lives.
710 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
712 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
716 if (typeof(axis
) == "undefined") axis
= 0;
718 var yRange
= this.yAxisRange(axis
);
721 if (!this.axes_
[axis
].logscale
) {
722 // yRange[1] - y is unit distance from the bottom.
723 // yRange[1] - yRange[0] is the scale of the range.
724 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
725 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
727 var logr1
= Dygraph
.log10(yRange
[1]);
728 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
734 * Converts an x value to a percentage from the left to the right of
737 * If the coordinate represents a value visible on the canvas, then
738 * the value will be between 0 and 1, where 0 is the left of the canvas.
739 * However, this method will return values outside the range, as
740 * values can fall outside the canvas.
742 * If x is null, this returns null.
743 * @param { Number } x The data x-coordinate.
744 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
746 Dygraph
.prototype.toPercentXCoord
= function(x
) {
751 var xRange
= this.xAxisRange();
752 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
756 * Returns the number of columns (including the independent variable).
757 * @return { Integer } The number of columns.
759 Dygraph
.prototype.numColumns
= function() {
760 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
764 * Returns the number of rows (excluding any header/label row).
765 * @return { Integer } The number of rows, less any header.
767 Dygraph
.prototype.numRows
= function() {
768 return this.rawData_
.length
;
772 * Returns the full range of the x-axis, as determined by the most extreme
773 * values in the data set. Not affected by zooming, visibility, etc.
774 * TODO(danvk): merge w/ xAxisExtremes
775 * @return { Array<Number> } A [low, high] pair
778 Dygraph
.prototype.fullXRange_
= function() {
779 if (this.numRows() > 0) {
780 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
787 * Returns the value in the given row and column. If the row and column exceed
788 * the bounds on the data, returns null. Also returns null if the value is
790 * @param { Number} row The row number of the data (0-based). Row 0 is the
791 * first row of data, not a header row.
792 * @param { Number} col The column number of the data (0-based)
793 * @return { Number } The value in the specified cell or null if the row/col
796 Dygraph
.prototype.getValue
= function(row
, col
) {
797 if (row
< 0 || row
> this.rawData_
.length
) return null;
798 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
800 return this.rawData_
[row
][col
];
804 * Generates interface elements for the Dygraph: a containing div, a div to
805 * display the current point, and a textbox to adjust the rolling average
806 * period. Also creates the Renderer/Layout elements.
809 Dygraph
.prototype.createInterface_
= function() {
810 // Create the all-enclosing graph div
811 var enclosing
= this.maindiv_
;
813 this.graphDiv
= document
.createElement("div");
814 this.graphDiv
.style
.width
= this.width_
+ "px";
815 this.graphDiv
.style
.height
= this.height_
+ "px";
816 enclosing
.appendChild(this.graphDiv
);
818 // Create the canvas for interactive parts of the chart.
819 this.canvas_
= Dygraph
.createCanvas();
820 this.canvas_
.style
.position
= "absolute";
821 this.canvas_
.width
= this.width_
;
822 this.canvas_
.height
= this.height_
;
823 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
824 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
826 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
828 // ... and for static parts of the chart.
829 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
830 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
832 if (this.attr_('showRangeSelector')) {
833 // The range selector must be created here so that its canvases and contexts get created here.
834 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
835 // The range selector also sets xAxisHeight in order to reserve space.
836 this.rangeSelector_
= new DygraphRangeSelector(this);
839 // The interactive parts of the graph are drawn on top of the chart.
840 this.graphDiv
.appendChild(this.hidden_
);
841 this.graphDiv
.appendChild(this.canvas_
);
842 this.mouseEventElement_
= this.createMouseEventElement_();
844 // Create the grapher
845 this.layout_
= new DygraphLayout(this);
847 if (this.rangeSelector_
) {
848 // This needs to happen after the graph canvases are added to the div and the layout object is created.
849 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
854 this.mouseMoveHandler
= function(e
) {
855 dygraph
.mouseMove_(e
);
857 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
859 this.mouseOutHandler
= function(e
) {
860 dygraph
.mouseOut_(e
);
862 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
864 this.createStatusMessage_();
865 this.createDragInterface_();
867 this.resizeHandler
= function(e
) {
871 // Update when the window is resized.
872 // TODO(danvk): drop frames depending on complexity of the chart.
873 Dygraph
.addEvent(window
, 'resize', this.resizeHandler
);
877 * Detach DOM elements in the dygraph and null out all data references.
878 * Calling this when you're done with a dygraph can dramatically reduce memory
879 * usage. See, e.g., the tests/perf.html example.
881 Dygraph
.prototype.destroy
= function() {
882 var removeRecursive
= function(node
) {
883 while (node
.hasChildNodes()) {
884 removeRecursive(node
.firstChild
);
885 node
.removeChild(node
.firstChild
);
889 // remove mouse event handlers
890 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseout', this.mouseOutHandler
);
891 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler
);
892 removeRecursive(this.maindiv_
);
894 var nullOut
= function(obj
) {
896 if (typeof(obj
[n
]) === 'object') {
901 // remove event handlers
902 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
903 this.resizeHandler
= null;
904 // These may not all be necessary, but it can't hurt...
905 nullOut(this.layout_
);
906 nullOut(this.plotter_
);
911 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
912 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
913 * or the zoom rectangles) is done on this.canvas_.
914 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
915 * @return {Object} The newly-created canvas
918 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
919 var h
= Dygraph
.createCanvas();
920 h
.style
.position
= "absolute";
921 // TODO(danvk): h should be offset from canvas. canvas needs to include
922 // some extra area to make it easier to zoom in on the far left and far
923 // right. h needs to be precisely the plot area, so that clipping occurs.
924 h
.style
.top
= canvas
.style
.top
;
925 h
.style
.left
= canvas
.style
.left
;
926 h
.width
= this.width_
;
927 h
.height
= this.height_
;
928 h
.style
.width
= this.width_
+ "px"; // for IE
929 h
.style
.height
= this.height_
+ "px"; // for IE
934 * Creates an overlay element used to handle mouse events.
935 * @return {Object} The mouse event element.
938 Dygraph
.prototype.createMouseEventElement_
= function() {
939 if (this.isUsingExcanvas_
) {
940 var elem
= document
.createElement("div");
941 elem
.style
.position
= 'absolute';
942 elem
.style
.backgroundColor
= 'white';
943 elem
.style
.filter
= 'alpha(opacity=0)';
944 elem
.style
.width
= this.width_
+ "px";
945 elem
.style
.height
= this.height_
+ "px";
946 this.graphDiv
.appendChild(elem
);
954 * Generate a set of distinct colors for the data series. This is done with a
955 * color wheel. Saturation/Value are customizable, and the hue is
956 * equally-spaced around the color wheel. If a custom set of colors is
957 * specified, that is used instead.
960 Dygraph
.prototype.setColors_
= function() {
961 var num
= this.attr_("labels").length
- 1;
963 var colors
= this.attr_('colors');
966 var sat
= this.attr_('colorSaturation') || 1.0;
967 var val
= this.attr_('colorValue') || 0.5;
968 var half
= Math
.ceil(num
/ 2);
969 for (i
= 1; i
<= num
; i
++) {
970 if (!this.visibility()[i
-1]) continue;
971 // alternate colors for high contrast.
972 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
973 var hue
= (1.0 * idx
/ (1 + num
));
974 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
977 for (i
= 0; i
< num
; i
++) {
978 if (!this.visibility()[i
]) continue;
979 var colorStr
= colors
[i
% colors
.length
];
980 this.colors_
.push(colorStr
);
984 this.plotter_
.setColors(this.colors_
);
988 * Return the list of colors. This is either the list of colors passed in the
989 * attributes or the autogenerated list of rgb(r,g,b) strings.
990 * @return {Array<string>} The list of colors.
992 Dygraph
.prototype.getColors
= function() {
997 * Create the div that contains information on the selected point(s)
998 * This goes in the top right of the canvas, unless an external div has already
1002 Dygraph
.prototype.createStatusMessage_
= function() {
1003 var userLabelsDiv
= this.user_attrs_
.labelsDiv
;
1004 if (userLabelsDiv
&& null !== userLabelsDiv
&&
1005 (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
1006 this.user_attrs_
.labelsDiv
= document
.getElementById(userLabelsDiv
);
1008 if (!this.attr_("labelsDiv")) {
1009 var divWidth
= this.attr_('labelsDivWidth');
1010 var messagestyle
= {
1011 "position": "absolute",
1014 "width": divWidth
+ "px",
1016 "left": (this.width_
- divWidth
- 2) + "px",
1017 "background": "white",
1018 "textAlign": "left",
1019 "overflow": "hidden"};
1020 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
1021 var div
= document
.createElement("div");
1022 div
.className
= "dygraph-legend";
1023 for (var name
in messagestyle
) {
1024 if (messagestyle
.hasOwnProperty(name
)) {
1025 div
.style
[name
] = messagestyle
[name
];
1028 this.graphDiv
.appendChild(div
);
1029 this.attrs_
.labelsDiv
= div
;
1034 * Position the labels div so that:
1035 * - its right edge is flush with the right edge of the charting area
1036 * - its top edge is flush with the top edge of the charting area
1039 Dygraph
.prototype.positionLabelsDiv_
= function() {
1040 // Don't touch a user-specified labelsDiv.
1041 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
1043 var area
= this.plotter_
.area
;
1044 var div
= this.attr_("labelsDiv");
1045 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
1046 div
.style
.top
= area
.y
+ "px";
1050 * Create the text box to adjust the averaging period
1053 Dygraph
.prototype.createRollInterface_
= function() {
1054 // Create a roller if one doesn't exist already.
1055 if (!this.roller_
) {
1056 this.roller_
= document
.createElement("input");
1057 this.roller_
.type
= "text";
1058 this.roller_
.style
.display
= "none";
1059 this.graphDiv
.appendChild(this.roller_
);
1062 var display
= this.attr_('showRoller') ? 'block' : 'none';
1064 var area
= this.plotter_
.area
;
1065 var textAttr
= { "position": "absolute",
1067 "top": (area
.y
+ area
.h
- 25) + "px",
1068 "left": (area
.x
+ 1) + "px",
1071 this.roller_
.size
= "2";
1072 this.roller_
.value
= this.rollPeriod_
;
1073 for (var name
in textAttr
) {
1074 if (textAttr
.hasOwnProperty(name
)) {
1075 this.roller_
.style
[name
] = textAttr
[name
];
1080 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1085 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1086 * canvas (i.e. DOM Coords).
1088 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1089 return Dygraph
.pageX(e
) - context
.px
;
1094 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1095 * canvas (i.e. DOM Coords).
1097 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1098 return Dygraph
.pageY(e
) - context
.py
;
1102 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1106 Dygraph
.prototype.createDragInterface_
= function() {
1108 // Tracks whether the mouse is down right now
1110 isPanning
: false, // is this drag part of a pan?
1111 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1112 dragStartX
: null, // pixel coordinates
1113 dragStartY
: null, // pixel coordinates
1114 dragEndX
: null, // pixel coordinates
1115 dragEndY
: null, // pixel coordinates
1116 dragDirection
: null,
1117 prevEndX
: null, // pixel coordinates
1118 prevEndY
: null, // pixel coordinates
1119 prevDragDirection
: null,
1121 // The value on the left side of the graph when a pan operation starts.
1122 initialLeftmostDate
: null,
1124 // The number of units each pixel spans. (This won't be valid for log
1126 xUnitsPerPixel
: null,
1128 // TODO(danvk): update this comment
1129 // The range in second/value units that the viewport encompasses during a
1130 // panning operation.
1133 // Top-left corner of the canvas, in DOM coords
1134 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1138 // Values for use with panEdgeFraction, which limit how far outside the
1139 // graph's data boundaries it can be panned.
1140 boundedDates
: null, // [minDate, maxDate]
1141 boundedValues
: null, // [[minValue, maxValue] ...]
1143 initializeMouseDown
: function(event
, g
, context
) {
1144 // prevents mouse drags from selecting page text.
1145 if (event
.preventDefault
) {
1146 event
.preventDefault(); // Firefox, Chrome, etc.
1148 event
.returnValue
= false; // IE
1149 event
.cancelBubble
= true;
1152 context
.px
= Dygraph
.findPosX(g
.canvas_
);
1153 context
.py
= Dygraph
.findPosY(g
.canvas_
);
1154 context
.dragStartX
= g
.dragGetX_(event
, context
);
1155 context
.dragStartY
= g
.dragGetY_(event
, context
);
1159 var interactionModel
= this.attr_("interactionModel");
1161 // Self is the graph.
1164 // Function that binds the graph and context to the handler.
1165 var bindHandler
= function(handler
) {
1166 return function(event
) {
1167 handler(event
, self
, context
);
1171 for (var eventName
in interactionModel
) {
1172 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1173 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
1174 bindHandler(interactionModel
[eventName
]));
1177 // If the user releases the mouse button during a drag, but not over the
1178 // canvas, then it doesn't count as a zooming action.
1179 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
1180 if (context
.isZooming
|| context
.isPanning
) {
1181 context
.isZooming
= false;
1182 context
.dragStartX
= null;
1183 context
.dragStartY
= null;
1186 if (context
.isPanning
) {
1187 context
.isPanning
= false;
1188 context
.draggingDate
= null;
1189 context
.dateRange
= null;
1190 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1191 delete self
.axes_
[i
].draggingValue
;
1192 delete self
.axes_
[i
].dragValueRange
;
1199 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1200 * up any previous zoom rectangles that were drawn. This could be optimized to
1201 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1204 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1205 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1206 * @param {Number} startX The X position where the drag started, in canvas
1208 * @param {Number} endX The current X position of the drag, in canvas coords.
1209 * @param {Number} startY The Y position where the drag started, in canvas
1211 * @param {Number} endY The current Y position of the drag, in canvas coords.
1212 * @param {Number} prevDirection the value of direction on the previous call to
1213 * this function. Used to avoid excess redrawing
1214 * @param {Number} prevEndX The value of endX on the previous call to this
1215 * function. Used to avoid excess redrawing
1216 * @param {Number} prevEndY The value of endY on the previous call to this
1217 * function. Used to avoid excess redrawing
1220 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1221 endY
, prevDirection
, prevEndX
,
1223 var ctx
= this.canvas_ctx_
;
1225 // Clean up from the previous rect if necessary
1226 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1227 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1228 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1229 } else if (prevDirection
== Dygraph
.VERTICAL
){
1230 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1231 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1234 // Draw a light-grey rectangle to show the new viewing area
1235 if (direction
== Dygraph
.HORIZONTAL
) {
1236 if (endX
&& startX
) {
1237 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1238 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1239 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1241 } else if (direction
== Dygraph
.VERTICAL
) {
1242 if (endY
&& startY
) {
1243 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1244 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1245 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1249 if (this.isUsingExcanvas_
) {
1250 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1255 * Clear the zoom rectangle (and perform no zoom).
1258 Dygraph
.prototype.clearZoomRect_
= function() {
1259 this.currentZoomRectArgs_
= null;
1260 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1264 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1265 * the canvas. The exact zoom window may be slightly larger if there are no data
1266 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1267 * which accepts dates that match the raw data. This function redraws the graph.
1269 * @param {Number} lowX The leftmost pixel value that should be visible.
1270 * @param {Number} highX The rightmost pixel value that should be visible.
1273 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1274 this.currentZoomRectArgs_
= null;
1275 // Find the earliest and latest dates contained in this canvasx range.
1276 // Convert the call to date ranges of the raw data.
1277 var minDate
= this.toDataXCoord(lowX
);
1278 var maxDate
= this.toDataXCoord(highX
);
1279 this.doZoomXDates_(minDate
, maxDate
);
1283 * Transition function to use in animations. Returns values between 0.0
1284 * (totally old values) and 1.0 (totally new values) for each frame.
1287 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1289 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1293 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1294 * method with doZoomX which accepts pixel coordinates. This function redraws
1297 * @param {Number} minDate The minimum date that should be visible.
1298 * @param {Number} maxDate The maximum date that should be visible.
1301 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1302 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1303 // can produce strange effects. Rather than the y-axis transitioning slowly
1304 // between values, it can jerk around.)
1305 var old_window
= this.xAxisRange();
1306 var new_window
= [minDate
, maxDate
];
1307 this.zoomed_x_
= true;
1309 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1310 if (that
.attr_("zoomCallback")) {
1311 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1317 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1318 * the canvas. This function redraws the graph.
1320 * @param {Number} lowY The topmost pixel value that should be visible.
1321 * @param {Number} highY The lowest pixel value that should be visible.
1324 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1325 this.currentZoomRectArgs_
= null;
1326 // Find the highest and lowest values in pixel range for each axis.
1327 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1328 // This is because pixels increase as you go down on the screen, whereas data
1329 // coordinates increase as you go up the screen.
1330 var oldValueRanges
= this.yAxisRanges();
1331 var newValueRanges
= [];
1332 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1333 var hi
= this.toDataYCoord(lowY
, i
);
1334 var low
= this.toDataYCoord(highY
, i
);
1335 newValueRanges
.push([low
, hi
]);
1338 this.zoomed_y_
= true;
1340 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1341 if (that
.attr_("zoomCallback")) {
1342 var xRange
= that
.xAxisRange();
1343 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1349 * Reset the zoom to the original view coordinates. This is the same as
1350 * double-clicking on the graph.
1354 Dygraph
.prototype.doUnzoom_
= function() {
1355 var dirty
= false, dirtyX
= false, dirtyY
= false;
1356 if (this.dateWindow_
!== null) {
1361 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1362 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1368 // Clear any selection, since it's likely to be drawn in the wrong place.
1369 this.clearSelection();
1372 this.zoomed_x_
= false;
1373 this.zoomed_y_
= false;
1375 var minDate
= this.rawData_
[0][0];
1376 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1378 // With only one frame, don't bother calculating extreme ranges.
1379 // TODO(danvk): merge this block w/ the code below
.
1380 if (!this.attr_("animatedZooms")) {
1381 this.dateWindow_
= null;
1382 for (i
= 0; i
< this.axes_
.length
; i
++) {
1383 if (this.axes_
[i
].valueWindow
!== null) {
1384 delete this.axes_
[i
].valueWindow
;
1388 if (this.attr_("zoomCallback")) {
1389 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1394 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1396 oldWindow
= this.xAxisRange();
1397 newWindow
= [minDate
, maxDate
];
1401 oldValueRanges
= this.yAxisRanges();
1402 // TODO(danvk): this is pretty inefficient
1403 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1404 var extremes
= packed
[1];
1406 // this has the side-effect of modifying this.axes_.
1407 // this doesn't make much sense in this context, but it's convenient (we
1408 // need this.axes_[*].extremeValues) and not harmful since we'll be
1409 // calling drawGraph_ shortly, which clobbers these values.
1410 this.computeYAxisRanges_(extremes
);
1412 newValueRanges
= [];
1413 for (i
= 0; i
< this.axes_
.length
; i
++) {
1414 var axis
= this.axes_
[i
];
1415 newValueRanges
.push(axis
.valueRange
!= null ? axis
.valueRange
: axis
.extremeRange
);
1420 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1422 that
.dateWindow_
= null;
1423 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1424 if (that
.axes_
[i
].valueWindow
!== null) {
1425 delete that
.axes_
[i
].valueWindow
;
1428 if (that
.attr_("zoomCallback")) {
1429 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1436 * Combined animation logic for all zoom functions.
1437 * either the x parameters or y parameters may be null.
1440 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1441 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1444 var valueRanges
= [];
1447 if (oldXRange
!== null && newXRange
!== null) {
1448 for (step
= 1; step
<= steps
; step
++) {
1449 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1450 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1451 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1455 if (oldYRanges
!== null && newYRanges
!== null) {
1456 for (step
= 1; step
<= steps
; step
++) {
1457 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1459 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1460 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1461 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1463 valueRanges
[step
-1] = thisRange
;
1468 Dygraph
.repeatAndCleanup(function(step
) {
1469 if (valueRanges
.length
) {
1470 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1471 var w
= valueRanges
[step
][i
];
1472 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1475 if (windows
.length
) {
1476 that
.dateWindow_
= windows
[step
];
1479 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1483 * Get the current graph's area object.
1485 * Returns: {x, y, w, h}
1487 Dygraph
.prototype.getArea
= function() {
1488 return this.plotter_
.area
;
1492 * Convert a mouse event to DOM coordinates relative to the graph origin.
1494 * Returns a two-element array: [X, Y].
1496 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1497 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1498 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1499 return [canvasx
, canvasy
];
1503 * Given a canvas X coordinate, find the closest row.
1504 * @param {Number} domX graph-relative DOM X coordinate
1505 * Returns: row number, integer
1508 Dygraph
.prototype.findClosestRow
= function(domX
) {
1509 var minDistX
= null;
1511 var points
= this.layout_
.points
;
1512 var l
= points
.length
;
1513 for (var i
= 0; i
< l
; i
++) {
1514 var point
= points
[i
];
1515 if (point
=== null) continue;
1516 var dist
= Math
.abs(point
.canvasx
- domX
);
1517 if (minDistX
!== null && dist
>= minDistX
) continue;
1521 return this.idxToRow_(idx
);
1525 * Given canvas X,Y coordinates, find the closest point
1526 * @param {Number} domX graph-relative DOM X coordinate
1527 * @param {Number} domY graph-relative DOM Y coordinate
1528 * Returns: {row, seriesName, point}
1531 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1534 var points
= this.layout_
.points
;
1535 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1536 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1537 var first
= this.layout_
.setPointsOffsets
[setIdx
];
1538 var len
= this.layout_
.setPointsLengths
[setIdx
];
1539 for (var i
= 0; i
< len
; ++i
) {
1540 var point
= points
[first
+ i
];
1541 if (point
=== null) continue;
1542 dx
= point
.canvasx
- domX
;
1543 dy
= point
.canvasy
- domY
;
1544 dist
= dx
* dx
+ dy
* dy
;
1545 if (minDist
!== null && dist
>= minDist
) continue;
1547 closestPoint
= point
;
1548 closestSeries
= setIdx
;
1552 var name
= this.layout_
.setNames
[closestSeries
];
1561 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1562 * @param {Number} domX graph-relative DOM X coordinate
1563 * @param {Number} domY graph-relative DOM Y coordinate
1564 * Returns: {row, seriesName, point}
1567 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1568 var row
= this.findClosestRow(domX
);
1569 var points
= this.layout_
.points
;
1570 var closestPoint
, closestSeries
;
1571 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1572 var first
= this.layout_
.setPointsOffsets
[setIdx
];
1573 var len
= this.layout_
.setPointsLengths
[setIdx
];
1574 if (row
>= len
) continue;
1575 var p1
= points
[first
+ row
];
1576 var py
= p1
.canvasy
;
1577 if (domX
> p1
.canvasx
&& row
+ 1 < len
) {
1578 // interpolate series Y value using next point
1579 var p2
= points
[first
+ row
+ 1];
1580 var dx
= p2
.canvasx
- p1
.canvasx
;
1582 var r
= (domX
- p1
.canvasx
) / dx
;
1583 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1585 } else if (domX
< p1
.canvasx
&& row
> 0) {
1586 // interpolate series Y value using previous point
1587 var p0
= points
[first
+ row
- 1];
1588 var dx
= p1
.canvasx
- p0
.canvasx
;
1590 var r
= (p1
.canvasx
- domX
) / dx
;
1591 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1594 // Stop if the point (domX, py) is above this series' upper edge
1595 if (setIdx
> 0 && py
>= domY
) break;
1597 closestSeries
= setIdx
;
1599 var name
= this.layout_
.setNames
[closestSeries
];
1608 * When the mouse moves in the canvas, display information about a nearby data
1609 * point and draw dots over those points in the data series. This function
1610 * takes care of cleanup of previously-drawn dots.
1611 * @param {Object} event The mousemove event from the browser.
1614 Dygraph
.prototype.mouseMove_
= function(event
) {
1615 // This prevents JS errors when mousing over the canvas before data loads.
1616 var points
= this.layout_
.points
;
1617 if (points
=== undefined
) return;
1619 var canvasCoords
= this.eventToDomCoords(event
);
1620 var canvasx
= canvasCoords
[0];
1621 var canvasy
= canvasCoords
[1];
1623 var mouseoverCallback
= this.attr_("mouseoverCallback");
1624 if (mouseoverCallback
) {
1625 var highlightRow
= this.idxToRow_(idx
);
1626 var ret
= mouseoverCallback(this, event
);
1630 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1631 var selectionChanged
= false;
1632 if (highlightSeriesOpts
) {
1634 if (this.attr_("stackedGraph")) {
1635 closest
= this.findStackedPoint(canvasx
, canvasy
);
1637 closest
= this.findClosestPoint(canvasx
, canvasy
);
1639 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1641 var idx
= this.findClosestRow(canvasx
);
1642 selectionChanged
= this.setSelection(idx
);
1645 var callback
= this.attr_("highlightCallback");
1646 if (callback
&& selectionChanged
) {
1647 callback(event
, this.lastx_
, this.selPoints_
, this.lastRow_
, this.highlightSet_
);
1652 * Transforms layout_.points index into data row number.
1653 * @param int layout_.points index
1654 * @return int row number, or -1 if none could be found.
1657 Dygraph
.prototype.idxToRow_
= function(idx
) {
1658 if (idx
< 0) return -1;
1660 // make sure that you get the boundaryIds record which is also defined (see bug #236)
1661 var boundaryIdx
= -1;
1662 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1663 if (this.boundaryIds_
[i
] !== undefined
) {
1668 if (boundaryIdx
< 0) return -1;
1669 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1670 var set
= this.layout_
.datasets
[setIdx
];
1671 if (idx
< set
.length
) {
1672 return this.boundaryIds_
[boundaryIdx
][0] + idx
;
1681 * Generates legend html dash for any stroke pattern. It will try to scale the
1682 * pattern to fit in 1em width. Or if small enough repeat the partern for 1em
1684 * @param strokePattern The pattern
1685 * @param color The color of the series.
1686 * @param oneEmWidth The width in pixels of 1em in the legend.
1688 Dygraph
.prototype.generateLegendDashHTML_
= function(strokePattern
, color
, oneEmWidth
) {
1690 var i
, j
, paddingLeft
, marginRight
;
1691 var strokePixelLength
= 0, segmentLoop
= 0;
1692 var normalizedPattern
= [];
1694 // IE 7,8 fail at these divs, so they get boring legend, have not tested 9.
1695 var isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
1699 if (!strokePattern
|| strokePattern
.length
<= 1) {
1701 dash
= "<div style=\"display: inline-block; position: relative; " +
1702 "bottom: .5ex; padding-left: 1em; height: 1px; " +
1703 "border-bottom: 2px solid " + color
+ ";\"></div>";
1705 // Compute the length of the pixels including the first segment twice,
1706 // since we repeat it.
1707 for (i
= 0; i
<= strokePattern
.length
; i
++) {
1708 strokePixelLength
+= strokePattern
[i
%strokePattern
.length
];
1711 // See if we can loop the pattern by itself at least twice.
1712 loop
= Math
.floor(oneEmWidth
/(strokePixelLength
-strokePattern
[0]));
1714 // This pattern fits at least two times, no scaling just convert to em;
1715 for (i
= 0; i
< strokePattern
.length
; i
++) {
1716 normalizedPattern
[i
] = strokePattern
[i
]/oneEmWidth
;
1718 // Since we are repeating the pattern, we don't worry about repeating the
1719 // first segment in one draw.
1720 segmentLoop
= normalizedPattern
.length
;
1722 // If the pattern doesn't fit in the legend we scale it to fit.
1724 for (i
= 0; i
< strokePattern
.length
; i
++) {
1725 normalizedPattern
[i
] = strokePattern
[i
]/strokePixelLength
;
1727 // For the scaled patterns we do redraw the first segment.
1728 segmentLoop
= normalizedPattern
.length
+1;
1730 // Now make the pattern.
1731 for (j
= 0; j
< loop
; j
++) {
1732 for (i
= 0; i
< segmentLoop
; i
+=2) {
1733 // The padding is the drawn segment.
1734 paddingLeft
= normalizedPattern
[i
%normalizedPattern
.length
];
1735 if (i
< strokePattern
.length
) {
1736 // The margin is the space segment.
1737 marginRight
= normalizedPattern
[(i
+1)%normalizedPattern
.length
];
1739 // The repeated first segment has no right margin.
1742 dash
+= "<div style=\"display: inline-block; position: relative; " +
1743 "bottom: .5ex; margin-right: " + marginRight
+ "em; padding-left: " +
1744 paddingLeft
+ "em; height: 1px; border-bottom: 2px solid " + color
+
1754 * Generates HTML for the legend which is displayed when hovering over the
1755 * chart. If no selected points are specified, a default legend is returned
1756 * (this may just be the empty string).
1757 * @param { Number } [x] The x-value of the selected points.
1758 * @param { [Object] } [sel_points] List of selected points for the given
1759 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1760 * @param { Number } [oneEmWidth] The pixel width for 1em in the legend.
1762 Dygraph
.prototype.generateLegendHTML_
= function(x
, sel_points
, oneEmWidth
) {
1763 // If no points are selected, we display a default legend. Traditionally,
1764 // this has been blank. But a better default would be a conventional legend,
1765 // which provides essential information for a non-interactive chart.
1766 var html
, sepLines
, i
, c
, dash
, strokePattern
;
1767 if (typeof(x
) === 'undefined') {
1768 if (this.attr_('legend') != 'always') return '';
1770 sepLines
= this.attr_('labelsSeparateLines');
1771 var labels
= this.attr_('labels');
1773 for (i
= 1; i
< labels
.length
; i
++) {
1774 if (!this.visibility()[i
- 1]) continue;
1775 c
= this.plotter_
.colors
[labels
[i
]];
1776 if (html
!== '') html
+= (sepLines
? '<br/>' : ' ');
1777 strokePattern
= this.attr_("strokePattern", labels
[i
]);
1778 dash
= this.generateLegendDashHTML_(strokePattern
, c
, oneEmWidth
);
1779 html
+= "<span style='font-weight: bold; color: " + c
+ ";'>" + dash
+
1780 " " + labels
[i
] + "</span>";
1785 var xOptView
= this.optionsViewForAxis_('x');
1786 var xvf
= xOptView('valueFormatter');
1787 html
= xvf(x
, xOptView
, this.attr_('labels')[0], this) + ":";
1790 var num_axes
= this.numAxes();
1791 for (i
= 0; i
< num_axes
; i
++) {
1792 yOptViews
[i
] = this.optionsViewForAxis_('y' + (i
? 1 + i
: ''));
1794 var showZeros
= this.attr_("labelsShowZeroValues");
1795 sepLines
= this.attr_("labelsSeparateLines");
1796 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1797 var pt
= this.selPoints_
[i
];
1798 if (pt
.yval
=== 0 && !showZeros
) continue;
1799 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1800 if (sepLines
) html
+= "<br/>";
1802 var yOptView
= yOptViews
[this.seriesToAxisMap_
[pt
.name
]];
1803 var fmtFunc
= yOptView('valueFormatter');
1804 c
= this.plotter_
.colors
[pt
.name
];
1805 var yval
= fmtFunc(pt
.yval
, yOptView
, pt
.name
, this);
1807 var cls
= (pt
.name
== this.highlightSet_
) ? " class='highlight'" : "";
1808 // TODO(danvk): use a template string here and make it an attribute.
1809 html
+= "<span" + cls
+ ">" + " <b><span style='color: " + c
+ ";'>" + pt
.name
+
1810 "</span></b>:" + yval
+ "</span>";
1817 * Displays information about the selected points in the legend. If there is no
1818 * selection, the legend will be cleared.
1819 * @param { Number } [x] The x-value of the selected points.
1820 * @param { [Object] } [sel_points] List of selected points for the given
1821 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1823 Dygraph
.prototype.setLegendHTML_
= function(x
, sel_points
) {
1824 var labelsDiv
= this.attr_("labelsDiv");
1825 var sizeSpan
= document
.createElement('span');
1826 // Calculates the width of 1em in pixels for the legend.
1827 sizeSpan
.setAttribute('style', 'margin: 0; padding: 0 0 0 1em; border: 0;');
1828 labelsDiv
.appendChild(sizeSpan
);
1829 var oneEmWidth
=sizeSpan
.offsetWidth
;
1831 var html
= this.generateLegendHTML_(x
, sel_points
, oneEmWidth
);
1832 if (labelsDiv
!== null) {
1833 labelsDiv
.innerHTML
= html
;
1835 if (typeof(this.shown_legend_error_
) == 'undefined') {
1836 this.error('labelsDiv is set to something nonexistent; legend will not be shown.');
1837 this.shown_legend_error_
= true;
1842 Dygraph
.prototype.animateSelection_
= function(direction
) {
1843 var totalSteps
= 10;
1845 if (this.fadeLevel
=== undefined
) {
1849 var start
= this.fadeLevel
;
1850 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1852 if (this.fadeLevel
) {
1853 this.updateSelection_(1.0);
1858 var thisId
= ++this.animateId
;
1860 Dygraph
.repeatAndCleanup(
1862 // ignore simultaneous animations
1863 if (that
.animateId
!= thisId
) return;
1865 that
.fadeLevel
+= direction
;
1866 if (that
.fadeLevel
=== 0) {
1867 that
.clearSelection();
1869 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1872 steps
, millis
, function() {});
1876 * Draw dots over the selectied points in the data series. This function
1877 * takes care of cleanup of previously-drawn dots.
1880 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1881 // Clear the previously drawn vertical, if there is one
1883 var ctx
= this.canvas_ctx_
;
1884 if (this.attr_('highlightSeriesOpts')) {
1885 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1886 var alpha
= this.attr_('highlightSeriesBackgroundFade');
1888 if (this.attr_('highlightSeriesAnimate')) {
1889 if (opt_animFraction
=== undefined
) {
1890 // start a new animation
1891 this.animateSelection_(1);
1894 alpha
*= opt_animFraction
;
1896 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1897 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1899 var setIdx
= this.datasetIndexFromSetName_(this.highlightSet_
);
1900 var underlay
= this.attr_('highlightUnderlay');
1901 if (underlay
) underlay(this, ctx
, setIdx
);
1902 this.plotter_
._drawLine(ctx
, setIdx
);
1903 } else if (this.previousVerticalX_
>= 0) {
1904 // Determine the maximum highlight circle size.
1905 var maxCircleSize
= 0;
1906 var labels
= this.attr_('labels');
1907 for (i
= 1; i
< labels
.length
; i
++) {
1908 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1909 if (r
> maxCircleSize
) maxCircleSize
= r
;
1911 var px
= this.previousVerticalX_
;
1912 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1913 2 * maxCircleSize
+ 2, this.height_
);
1916 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1917 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1920 if (this.selPoints_
.length
> 0) {
1921 // Set the status message to indicate the selected point(s)
1922 if (this.attr_('showLabelsOnHighlight')) {
1923 this.setLegendHTML_(this.lastx_
, this.selPoints_
);
1926 // Draw colored circles over the center of each selected point
1927 var canvasx
= this.selPoints_
[0].canvasx
;
1929 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1930 var pt
= this.selPoints_
[i
];
1931 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1933 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1935 ctx
.fillStyle
= this.plotter_
.colors
[pt
.name
];
1936 ctx
.arc(canvasx
, pt
.canvasy
, circleSize
, 0, 2 * Math
.PI
, false);
1941 this.previousVerticalX_
= canvasx
;
1946 * Manually set the selected points and display information about them in the
1947 * legend. The selection can be cleared using clearSelection() and queried
1948 * using getSelection().
1949 * @param { Integer } row number that should be highlighted (i.e. appear with
1950 * hover dots on the chart). Set to false to clear any selection.
1951 * @param { seriesName } optional series name to highlight that series with the
1952 * the highlightSeriesOpts setting.
1954 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
) {
1955 // Extract the points we've selected
1956 this.selPoints_
= [];
1959 if (row
!== false) {
1960 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1961 if (this.boundaryIds_
[i
] !== undefined
) {
1962 row
-= this.boundaryIds_
[i
][0];
1968 var changed
= false;
1969 if (row
!== false && row
>= 0) {
1970 if (row
!= this.lastRow_
) changed
= true;
1971 this.lastRow_
= row
;
1972 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1973 var set
= this.layout_
.datasets
[setIdx
];
1974 if (row
< set
.length
) {
1975 var point
= this.layout_
.points
[pos
+row
];
1977 if (this.attr_("stackedGraph")) {
1978 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1981 this.selPoints_
.push(point
);
1986 if (this.lastRow_
>= 0) changed
= true;
1990 if (this.selPoints_
.length
) {
1991 this.lastx_
= this.selPoints_
[0].xval
;
1996 if (opt_seriesName
!== undefined
) {
1997 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
1998 this.highlightSet_
= opt_seriesName
;
2002 this.updateSelection_(undefined
);
2008 * The mouse has left the canvas. Clear out whatever artifacts remain
2009 * @param {Object} event the mouseout event from the browser.
2012 Dygraph
.prototype.mouseOut_
= function(event
) {
2013 if (this.attr_("unhighlightCallback")) {
2014 this.attr_("unhighlightCallback")(event
);
2017 if (this.attr_("hideOverlayOnMouseOut")) {
2018 this.clearSelection();
2023 * Clears the current selection (i.e. points that were highlighted by moving
2024 * the mouse over the chart).
2026 Dygraph
.prototype.clearSelection
= function() {
2027 // Get rid of the overlay data
2028 if (this.fadeLevel
) {
2029 this.animateSelection_(-1);
2032 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2034 this.setLegendHTML_();
2035 this.selPoints_
= [];
2038 this.highlightSet_
= null;
2042 * Returns the number of the currently selected row. To get data for this row,
2043 * you can use the getValue method.
2044 * @return { Integer } row number, or -1 if nothing is selected
2046 Dygraph
.prototype.getSelection
= function() {
2047 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2051 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
2052 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
2053 return row
+ this.boundaryIds_
[0][0];
2059 Dygraph
.prototype.getHighlightSeries
= function() {
2060 return this.highlightSet_
;
2064 * Fires when there's data available to be graphed.
2065 * @param {String} data Raw CSV data to be plotted
2068 Dygraph
.prototype.loadedEvent_
= function(data
) {
2069 this.rawData_
= this.parseCSV_(data
);
2074 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2077 Dygraph
.prototype.addXTicks_
= function() {
2078 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2080 if (this.dateWindow_
) {
2081 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2083 range
= this.fullXRange_();
2086 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2087 var xTicks
= xAxisOptionsView('ticker')(
2090 this.width_
, // TODO(danvk): should be area.width
2093 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2094 // console.log(msg);
2095 this.layout_
.setXTicks(xTicks
);
2100 * Computes the range of the data series (including confidence intervals).
2101 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2102 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2103 * @return [low, high]
2105 Dygraph
.prototype.extremeValues_
= function(series
) {
2106 var minY
= null, maxY
= null, j
, y
;
2108 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2110 // With custom bars, maxY is the max of the high values.
2111 for (j
= 0; j
< series
.length
; j
++) {
2112 y
= series
[j
][1][0];
2114 var low
= y
- series
[j
][1][1];
2115 var high
= y
+ series
[j
][1][2];
2116 if (low
> y
) low
= y
; // this can happen with custom bars,
2117 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2118 if (maxY
=== null || high
> maxY
) {
2121 if (minY
=== null || low
< minY
) {
2126 for (j
= 0; j
< series
.length
; j
++) {
2128 if (y
=== null || isNaN(y
)) continue;
2129 if (maxY
=== null || y
> maxY
) {
2132 if (minY
=== null || y
< minY
) {
2138 return [minY
, maxY
];
2143 * This function is called once when the chart's data is changed or the options
2144 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2145 * idea is that values derived from the chart's data can be computed here,
2146 * rather than every time the chart is drawn. This includes things like the
2147 * number of axes, rolling averages, etc.
2149 Dygraph
.prototype.predraw_
= function() {
2150 var start
= new Date();
2152 // TODO(danvk): move more computations out of drawGraph_ and into here.
2153 this.computeYAxes_();
2155 // Create a new plotter.
2156 if (this.plotter_
) this.plotter_
.clear();
2157 this.plotter_
= new DygraphCanvasRenderer(this,
2162 // The roller sits in the bottom left corner of the chart. We don't know where
2163 // this will be until the options are available, so it's positioned here.
2164 this.createRollInterface_();
2166 // Same thing applies for the labelsDiv. It's right edge should be flush with
2167 // the right edge of the charting area (which may not be the same as the right
2168 // edge of the div, if we have two y-axes.
2169 this.positionLabelsDiv_();
2171 if (this.rangeSelector_
) {
2172 this.rangeSelector_
.renderStaticLayer();
2175 // Convert the raw data (a 2D array) into the internal format and compute
2176 // rolling averages.
2177 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2178 for (var i
= 1; i
< this.numColumns(); i
++) {
2179 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
2180 var logScale
= this.attr_('logscale', i
);
2181 var series
= this.extractSeries_(this.rawData_
, i
, logScale
, connectSeparatedPoints
);
2182 series
= this.rollingAverage(series
, this.rollPeriod_
);
2183 this.rolledSeries_
.push(series
);
2186 // If the data or options have changed, then we'd better redraw.
2189 // This is used to determine whether to do various animations.
2190 var end
= new Date();
2191 this.drawingTimeMs_
= (end
- start
);
2195 * Loop over all fields and create datasets, calculating extreme y-values for
2196 * each series and extreme x-indices as we go.
2198 * dateWindow is passed in as an explicit parameter so that we can compute
2199 * extreme values "speculatively", i.e. without actually setting state on the
2202 * TODO(danvk): make this more of a true function
2203 * @return [ datasets, seriesExtremes, boundaryIds ]
2206 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2207 var boundaryIds
= [];
2208 var cumulative_y
= []; // For stacked series.
2210 var extremes
= {}; // series name -> [low, high]
2213 // Loop over the fields (series). Go from the last to the first,
2214 // because if they're stacked that's how we accumulate the values.
2215 var num_series
= rolledSeries
.length
- 1;
2216 for (i
= num_series
; i
>= 1; i
--) {
2217 if (!this.visibility()[i
- 1]) continue;
2219 // TODO(danvk): is this copy really necessary?
2221 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2222 series
.push(rolledSeries
[i
][j
]);
2225 // Prune down to the desired range, if necessary (for zooming)
2226 // Because there can be lines going to points outside of the visible area,
2227 // we actually prune to visible points, plus one on either side.
2228 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2230 var low
= dateWindow
[0];
2231 var high
= dateWindow
[1];
2233 // TODO(danvk): do binary search instead of linear search.
2234 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2235 var firstIdx
= null, lastIdx
= null;
2236 for (k
= 0; k
< series
.length
; k
++) {
2237 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2240 if (series
[k
][0] <= high
) {
2244 if (firstIdx
=== null) firstIdx
= 0;
2245 if (firstIdx
> 0) firstIdx
--;
2246 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2247 if (lastIdx
< series
.length
- 1) lastIdx
++;
2248 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2249 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2250 pruned
.push(series
[k
]);
2254 boundaryIds
[i
-1] = [0, series
.length
-1];
2257 var seriesExtremes
= this.extremeValues_(series
);
2260 for (j
=0; j
<series
.length
; j
++) {
2261 series
[j
] = [series
[j
][0],
2266 } else if (this.attr_("stackedGraph")) {
2267 var l
= series
.length
;
2269 for (j
= 0; j
< l
; j
++) {
2270 // If one data set has a NaN, let all subsequent stacked
2271 // sets inherit the NaN -- only start at 0 for the first set.
2272 var x
= series
[j
][0];
2273 if (cumulative_y
[x
] === undefined
) {
2274 cumulative_y
[x
] = 0;
2277 actual_y
= series
[j
][1];
2278 cumulative_y
[x
] += actual_y
;
2280 series
[j
] = [x
, cumulative_y
[x
]];
2282 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2283 seriesExtremes
[1] = cumulative_y
[x
];
2285 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2286 seriesExtremes
[0] = cumulative_y
[x
];
2291 var seriesName
= this.attr_("labels")[i
];
2292 extremes
[seriesName
] = seriesExtremes
;
2293 datasets
[i
] = series
;
2296 return [ datasets
, extremes
, boundaryIds
];
2300 * Update the graph with new data. This method is called when the viewing area
2301 * has changed. If the underlying data or options have changed, predraw_ will
2302 * be called before drawGraph_ is called.
2304 * clearSelection, when undefined or true, causes this.clearSelection to be
2305 * called at the end of the draw operation. This should rarely be defined,
2306 * and never true (that is it should be undefined most of the time, and
2311 Dygraph
.prototype.drawGraph_
= function(clearSelection
) {
2312 var start
= new Date();
2314 if (typeof(clearSelection
) === 'undefined') {
2315 clearSelection
= true;
2318 // This is used to set the second parameter to drawCallback, below.
2319 var is_initial_draw
= this.is_initial_draw_
;
2320 this.is_initial_draw_
= false;
2322 this.layout_
.removeAllDatasets();
2324 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2326 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2327 var datasets
= packed
[0];
2328 var extremes
= packed
[1];
2329 this.boundaryIds_
= packed
[2];
2331 this.setIndexByName_
= {};
2332 var labels
= this.attr_("labels");
2333 if (labels
.length
> 0) {
2334 this.setIndexByName_
[labels
[0]] = 0;
2337 for (var i
= 1; i
< datasets
.length
; i
++) {
2338 this.setIndexByName_
[labels
[i
]] = i
;
2339 if (!this.visibility()[i
- 1]) continue;
2340 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2341 this.datasetIndex_
[i
] = dataIdx
++;
2344 this.computeYAxisRanges_(extremes
);
2345 this.layout_
.setYAxes(this.axes_
);
2349 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2350 var tmp_zoomed_x
= this.zoomed_x_
;
2351 // Tell PlotKit to use this new data and render itself
2352 this.layout_
.setDateWindow(this.dateWindow_
);
2353 this.zoomed_x_
= tmp_zoomed_x
;
2354 this.layout_
.evaluateWithError();
2355 this.renderGraph_(is_initial_draw
, false);
2357 if (this.attr_("timingName")) {
2358 var end
= new Date();
2360 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2365 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
, clearSelection
) {
2366 this.plotter_
.clear();
2367 this.plotter_
.render();
2368 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2369 this.canvas_
.height
);
2371 // Generate a static legend before any particular point is selected.
2372 this.setLegendHTML_();
2374 if (!is_initial_draw
) {
2375 if (clearSelection
) {
2376 if (typeof(this.selPoints_
) !== 'undefined' && this.selPoints_
.length
) {
2377 // We should select the point nearest the page x/y here
, but it
's easier
2378 // to just clear the selection. This prevents erroneous hover dots from
2380 this.clearSelection();
2382 this.clearSelection();
2387 if (this.rangeSelector_) {
2388 this.rangeSelector_.renderInteractiveLayer();
2391 if (this.attr_("drawCallback") !== null) {
2392 this.attr_("drawCallback")(this, is_initial_draw);
2398 * Determine properties of the y-axes which are independent of the data
2399 * currently being displayed. This includes things like the number of axes and
2400 * the style of the axes. It does not include the range of each axis and its
2402 * This fills in this.axes_ and this.seriesToAxisMap_.
2403 * axes_ = [ { options } ]
2404 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2405 * indices are into the axes_ array.
2407 Dygraph.prototype.computeYAxes_ = function() {
2408 // Preserve valueWindow settings if they exist, and if the user hasn't
2409 // specified a new valueRange.
2410 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2411 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2413 for (index
= 0; index
< this.axes_
.length
; index
++) {
2414 valueWindows
.push(this.axes_
[index
].valueWindow
);
2418 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2419 this.seriesToAxisMap_
= {};
2421 // Get a list of series names.
2422 var labels
= this.attr_("labels");
2424 for (i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2426 // all options which could be applied per-axis:
2434 'axisLabelFontSize',
2439 // Copy global axis options over to the first axis.
2440 for (i
= 0; i
< axisOptions
.length
; i
++) {
2441 var k
= axisOptions
[i
];
2443 if (v
) this.axes_
[0][k
] = v
;
2446 // Go through once and add all the axes.
2447 for (seriesName
in series
) {
2448 if (!series
.hasOwnProperty(seriesName
)) continue;
2449 axis
= this.attr_("axis", seriesName
);
2450 if (axis
=== null) {
2451 this.seriesToAxisMap_
[seriesName
] = 0;
2454 if (typeof(axis
) == 'object') {
2455 // Add a new axis, making a copy of its per-axis options.
2457 Dygraph
.update(opts
, this.axes_
[0]);
2458 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2459 var yAxisId
= this.axes_
.length
;
2460 opts
.yAxisId
= yAxisId
;
2462 Dygraph
.update(opts
, axis
);
2463 this.axes_
.push(opts
);
2464 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2468 // Go through one more time and assign series to an axis defined by another
2469 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2470 for (seriesName
in series
) {
2471 if (!series
.hasOwnProperty(seriesName
)) continue;
2472 axis
= this.attr_("axis", seriesName
);
2473 if (typeof(axis
) == 'string') {
2474 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2475 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2476 "series " + axis
+ ", which does not define its own axis.");
2479 var idx
= this.seriesToAxisMap_
[axis
];
2480 this.seriesToAxisMap_
[seriesName
] = idx
;
2484 if (valueWindows
!== undefined
) {
2485 // Restore valueWindow settings.
2486 for (index
= 0; index
< valueWindows
.length
; index
++) {
2487 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2492 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2494 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2495 v
= opts("valueRange");
2496 if (v
) this.axes_
[axis
].valueRange
= v
;
2497 } else { // To keep old behavior
2498 var axes
= this.user_attrs_
.axes
;
2499 if (axes
&& axes
.y2
) {
2500 v
= axes
.y2
.valueRange
;
2501 if (v
) this.axes_
[axis
].valueRange
= v
;
2509 * Returns the number of y-axes on the chart.
2510 * @return {Number} the number of axes.
2512 Dygraph
.prototype.numAxes
= function() {
2514 for (var series
in this.seriesToAxisMap_
) {
2515 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2516 var idx
= this.seriesToAxisMap_
[series
];
2517 if (idx
> last_axis
) last_axis
= idx
;
2519 return 1 + last_axis
;
2524 * Returns axis properties for the given series.
2525 * @param { String } setName The name of the series for which to get axis
2526 * properties, e.g. 'Y1'.
2527 * @return { Object } The axis properties.
2529 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2530 // TODO(danvk): handle errors.
2531 return this.axes_
[this.seriesToAxisMap_
[series
]];
2536 * Determine the value range and tick marks for each axis.
2537 * @param {Object} extremes A mapping from seriesName -> [low, high]
2538 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2540 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2541 // Build a map from axis number -> [list of series names]
2542 var seriesForAxis
= [], series
;
2543 for (series
in this.seriesToAxisMap_
) {
2544 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2545 var idx
= this.seriesToAxisMap_
[series
];
2546 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2547 seriesForAxis
[idx
].push(series
);
2550 // Compute extreme values, a span and tick marks for each axis.
2551 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2552 var axis
= this.axes_
[i
];
2554 if (!seriesForAxis
[i
]) {
2555 // If no series are defined or visible then use a reasonable default
2556 axis
.extremeRange
= [0, 1];
2558 // Calculate the extremes of extremes.
2559 series
= seriesForAxis
[i
];
2560 var minY
= Infinity
; // extremes[series[0]][0];
2561 var maxY
= -Infinity
; // extremes[series[0]][1];
2562 var extremeMinY
, extremeMaxY
;
2564 for (var j
= 0; j
< series
.length
; j
++) {
2565 // this skips invisible series
2566 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2568 // Only use valid extremes to stop null data series' from corrupting the scale.
2569 extremeMinY
= extremes
[series
[j
]][0];
2570 if (extremeMinY
!== null) {
2571 minY
= Math
.min(extremeMinY
, minY
);
2573 extremeMaxY
= extremes
[series
[j
]][1];
2574 if (extremeMaxY
!== null) {
2575 maxY
= Math
.max(extremeMaxY
, maxY
);
2578 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2580 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2581 if (minY
== Infinity
) minY
= 0;
2582 if (maxY
== -Infinity
) maxY
= 1;
2584 // Add some padding and round up to an integer to be human-friendly.
2585 var span
= maxY
- minY
;
2586 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2587 if (span
=== 0) { span
= maxY
; }
2589 var maxAxisY
, minAxisY
;
2590 if (axis
.logscale
) {
2591 maxAxisY
= maxY
+ 0.1 * span
;
2594 maxAxisY
= maxY
+ 0.1 * span
;
2595 minAxisY
= minY
- 0.1 * span
;
2597 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2598 if (!this.attr_("avoidMinZero")) {
2599 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2600 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2603 if (this.attr_("includeZero")) {
2604 if (maxY
< 0) maxAxisY
= 0;
2605 if (minY
> 0) minAxisY
= 0;
2608 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2610 if (axis
.valueWindow
) {
2611 // This is only set if the user has zoomed on the y-axis. It is never set
2612 // by a user. It takes precedence over axis.valueRange because, if you set
2613 // valueRange, you'd still expect to be able to pan.
2614 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2615 } else if (axis
.valueRange
) {
2616 // This is a user-set value range for this axis.
2617 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2619 axis
.computedValueRange
= axis
.extremeRange
;
2622 // Add ticks. By default, all axes inherit the tick positions of the
2623 // primary axis. However, if an axis is specifically marked as having
2624 // independent ticks, then that is permissible as well.
2625 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2626 var ticker
= opts('ticker');
2627 if (i
=== 0 || axis
.independentTicks
) {
2628 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2629 axis
.computedValueRange
[1],
2630 this.height_
, // TODO(danvk): should be area.height
2634 var p_axis
= this.axes_
[0];
2635 var p_ticks
= p_axis
.ticks
;
2636 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2637 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2638 var tick_values
= [];
2639 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2640 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2641 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2642 tick_values
.push(y_val
);
2645 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2646 axis
.computedValueRange
[1],
2647 this.height_
, // TODO(danvk): should be area.height
2656 * Extracts one series from the raw data (a 2D array) into an array of (date,
2659 * This is where undesirable points (i.e. negative values on log scales and
2660 * missing values through which we wish to connect lines) are dropped.
2664 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
, connectSeparatedPoints
) {
2666 for (var j
= 0; j
< rawData
.length
; j
++) {
2667 var x
= rawData
[j
][0];
2668 var point
= rawData
[j
][i
];
2670 // On the log scale, points less than zero do not exist.
2671 // This will create a gap in the chart. Note that this ignores
2672 // connectSeparatedPoints.
2676 series
.push([x
, point
]);
2678 if (point
!== null || !connectSeparatedPoints
) {
2679 series
.push([x
, point
]);
2688 * Calculates the rolling average of a data set.
2689 * If originalData is [label, val], rolls the average of those.
2690 * If originalData is [label, [, it's interpreted as [value, stddev]
2691 * and the roll is returned in the same form, with appropriately reduced
2692 * stddev for each value.
2693 * Note that this is where fractional input (i.e. '5/10') is converted into
2695 * @param {Array} originalData The data in the appropriate format (see above)
2696 * @param {Number} rollPeriod The number of points over which to average the
2699 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2700 if (originalData
.length
< 2)
2701 return originalData
;
2702 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2703 var rollingData
= [];
2704 var sigma
= this.attr_("sigma");
2706 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2707 if (this.fractions_
) {
2709 var den
= 0; // numerator/denominator
2711 for (i
= 0; i
< originalData
.length
; i
++) {
2712 num
+= originalData
[i
][1][0];
2713 den
+= originalData
[i
][1][1];
2714 if (i
- rollPeriod
>= 0) {
2715 num
-= originalData
[i
- rollPeriod
][1][0];
2716 den
-= originalData
[i
- rollPeriod
][1][1];
2719 var date
= originalData
[i
][0];
2720 var value
= den
? num
/ den
: 0.0;
2721 if (this.attr_("errorBars")) {
2722 if (this.attr_("wilsonInterval")) {
2723 // For more details on this confidence interval, see:
2724 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2726 var p
= value
< 0 ? 0 : value
, n
= den
;
2727 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2728 var denom
= 1 + sigma
* sigma
/ den
;
2729 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2730 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2731 rollingData
[i
] = [date
,
2732 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2734 rollingData
[i
] = [date
, [0, 0, 0]];
2737 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2738 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2741 rollingData
[i
] = [date
, mult
* value
];
2744 } else if (this.attr_("customBars")) {
2749 for (i
= 0; i
< originalData
.length
; i
++) {
2750 var data
= originalData
[i
][1];
2752 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2754 if (y
!== null && !isNaN(y
)) {
2760 if (i
- rollPeriod
>= 0) {
2761 var prev
= originalData
[i
- rollPeriod
];
2762 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2770 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2771 1.0 * (mid
- low
) / count
,
2772 1.0 * (high
- mid
) / count
]];
2774 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2778 // Calculate the rolling average for the first rollPeriod - 1 points where
2779 // there is not enough data to roll over the full number of points
2780 if (!this.attr_("errorBars")){
2781 if (rollPeriod
== 1) {
2782 return originalData
;
2785 for (i
= 0; i
< originalData
.length
; i
++) {
2788 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2789 y
= originalData
[j
][1];
2790 if (y
=== null || isNaN(y
)) continue;
2792 sum
+= originalData
[j
][1];
2795 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2797 rollingData
[i
] = [originalData
[i
][0], null];
2802 for (i
= 0; i
< originalData
.length
; i
++) {
2806 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2807 y
= originalData
[j
][1][0];
2808 if (y
=== null || isNaN(y
)) continue;
2810 sum
+= originalData
[j
][1][0];
2811 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2814 stddev
= Math
.sqrt(variance
) / num_ok
;
2815 rollingData
[i
] = [originalData
[i
][0],
2816 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2818 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2828 * Detects the type of the str (date or numeric) and sets the various
2829 * formatting attributes in this.attrs_ based on this type.
2830 * @param {String} str An x value.
2833 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2835 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2836 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2837 str
.indexOf('/') >= 0 ||
2838 isNaN(parseFloat(str
))) {
2840 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2841 // TODO(danvk): remove support for this format.
2846 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2847 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2848 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2849 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2851 /** @private (shut up, jsdoc!) */
2852 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2853 // TODO(danvk): use Dygraph.numberValueFormatter here?
2854 /** @private (shut up, jsdoc!) */
2855 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2856 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2857 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2862 * Parses the value as a floating point number. This is like the parseFloat()
2863 * built-in, but with a few differences:
2864 * - the empty string is parsed as null, rather than NaN.
2865 * - if the string cannot be parsed at all, an error is logged.
2866 * If the string can't be parsed, this method returns null.
2867 * @param {String} x The string to be parsed
2868 * @param {Number} opt_line_no The line number from which the string comes.
2869 * @param {String} opt_line The text of the line from which the string comes.
2873 // Parse the x as a float or return null if it's not a number.
2874 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2875 var val
= parseFloat(x
);
2876 if (!isNaN(val
)) return val
;
2878 // Try to figure out what happeend.
2879 // If the value is the empty string, parse it as null.
2880 if (/^ *$/.test(x
)) return null;
2882 // If it was actually "NaN", return it as NaN.
2883 if (/^ *nan *$/i.test(x
)) return NaN
;
2885 // Looks like a parsing error.
2886 var msg
= "Unable to parse '" + x
+ "' as a number";
2887 if (opt_line
!== null && opt_line_no
!== null) {
2888 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2897 * Parses a string in a special csv format. We expect a csv file where each
2898 * line is a date point, and the first field in each line is the date string.
2899 * We also expect that all remaining fields represent series.
2900 * if the errorBars attribute is set, then interpret the fields as:
2901 * date, series1, stddev1, series2, stddev2, ...
2902 * @param {[Object]} data See above.
2904 * @return [Object] An array with one entry for each row. These entries
2905 * are an array of cells in that row. The first entry is the parsed x-value for
2906 * the row. The second, third, etc. are the y-values. These can take on one of
2907 * three forms, depending on the CSV and constructor parameters:
2909 * 2. [ value, stddev ]
2910 * 3. [ low value, center value, high value ]
2912 Dygraph
.prototype.parseCSV_
= function(data
) {
2914 var lines
= data
.split("\n");
2917 // Use the default delimiter or fall back to a tab if that makes sense.
2918 var delim
= this.attr_('delimiter');
2919 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2924 if (!('labels' in this.user_attrs_
)) {
2925 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2927 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2932 var defaultParserSet
= false; // attempt to auto-detect x value type
2933 var expectedCols
= this.attr_("labels").length
;
2934 var outOfOrder
= false;
2935 for (var i
= start
; i
< lines
.length
; i
++) {
2936 var line
= lines
[i
];
2938 if (line
.length
=== 0) continue; // skip blank lines
2939 if (line
[0] == '#') continue; // skip comment lines
2940 var inFields
= line
.split(delim
);
2941 if (inFields
.length
< 2) continue;
2944 if (!defaultParserSet
) {
2945 this.detectTypeFromString_(inFields
[0]);
2946 xParser
= this.attr_("xValueParser");
2947 defaultParserSet
= true;
2949 fields
[0] = xParser(inFields
[0], this);
2951 // If fractions are expected, parse the numbers as "A/B
"
2952 if (this.fractions_) {
2953 for (j = 1; j < inFields.length; j++) {
2954 // TODO(danvk): figure out an appropriate way to flag parse errors.
2955 vals = inFields[j].split("/");
2956 if (vals.length != 2) {
2957 this.error('Expected fractional "num
/den
" values in CSV data ' +
2958 "but found a value
'" + inFields[j] + "' on line
" +
2959 (1 + i) + " ('" + line + "') which is not of
this form
.");
2962 fields[j] = [this.parseFloat_(vals[0], i, line),
2963 this.parseFloat_(vals[1], i, line)];
2966 } else if (this.attr_("errorBars
")) {
2967 // If there are error bars, values are (value, stddev) pairs
2968 if (inFields.length % 2 != 1) {
2969 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2970 'but line ' + (1 + i) + ' has an odd number of values (' +
2971 (inFields.length - 1) + "): '" + line + "'");
2973 for (j = 1; j < inFields.length; j += 2) {
2974 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2975 this.parseFloat_(inFields[j + 1], i, line)];
2977 } else if (this.attr_("customBars
")) {
2978 // Bars are a low;center;high tuple
2979 for (j = 1; j < inFields.length; j++) {
2980 var val = inFields[j];
2981 if (/^ *$/.test(val)) {
2982 fields[j] = [null, null, null];
2984 vals = val.split(";");
2985 if (vals.length == 3) {
2986 fields[j] = [ this.parseFloat_(vals[0], i, line),
2987 this.parseFloat_(vals[1], i, line),
2988 this.parseFloat_(vals[2], i, line) ];
2990 this.warn('When using customBars, values must be either blank ' +
2991 'or "low
;center
;high
" tuples (got "' + val +
2992 '" on line ' + (1+i));
2997 // Values are just numbers
2998 for (j = 1; j < inFields.length; j++) {
2999 fields[j] = this.parseFloat_(inFields[j], i, line);
3002 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
3006 if (fields.length != expectedCols) {
3007 this.error("Number of columns
in line
" + i + " (" + fields.length +
3008 ") does not agree
with number of
labels (" + expectedCols +
3012 // If the user specified the 'labels' option and none of the cells of the
3013 // first row parsed correctly, then they probably double-specified the
3014 // labels. We go with the values set in the option, discard this row and
3015 // log a warning to the JS console.
3016 if (i === 0 && this.attr_('labels')) {
3017 var all_null = true;
3018 for (j = 0; all_null && j < fields.length; j++) {
3019 if (fields[j]) all_null = false;
3022 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3023 "CSV
data ('" + line + "') appears to also contain labels
. " +
3024 "Will drop the CSV labels and
use the option labels
.");
3032 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3033 ret.sort(function(a,b) { return a[0] - b[0]; });
3041 * The user has provided their data as a pre-packaged JS array. If the x values
3042 * are numeric, this is the same as dygraphs' internal format. If the x values
3043 * are dates, we need to convert them from Date objects to ms since epoch.
3044 * @param {[Object]} data
3045 * @return {[Object]} data with numeric x values.
3047 Dygraph.prototype.parseArray_ = function(data) {
3048 // Peek at the first x value to see if it's numeric.
3049 if (data.length === 0) {
3050 this.error("Can
't plot empty data set");
3053 if (data[0].length === 0) {
3054 this.error("Data set cannot contain an empty row");
3059 if (this.attr_("labels") === null) {
3060 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3061 "in the options parameter");
3062 this.attrs_.labels = [ "X" ];
3063 for (i = 1; i < data[0].length; i++) {
3064 this.attrs_.labels.push("Y" + i);
3068 if (Dygraph.isDateLike(data[0][0])) {
3069 // Some intelligent defaults for a date x-axis.
3070 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3071 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3072 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3074 // Assume they're all dates
.
3075 var parsedData
= Dygraph
.clone(data
);
3076 for (i
= 0; i
< data
.length
; i
++) {
3077 if (parsedData
[i
].length
=== 0) {
3078 this.error("Row " + (1 + i
) + " of data is empty");
3081 if (parsedData
[i
][0] === null ||
3082 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3083 isNaN(parsedData
[i
][0].getTime())) {
3084 this.error("x value in row " + (1 + i
) + " is not a Date");
3087 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3091 // Some intelligent defaults for a numeric x-axis.
3092 /** @private (shut up, jsdoc!) */
3093 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3094 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3095 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
3101 * Parses a DataTable object from gviz.
3102 * The data is expected to have a first column that is either a date or a
3103 * number. All subsequent columns must be numbers. If there is a clear mismatch
3104 * between this.xValueParser_ and the type of the first column, it will be
3105 * fixed. Fills out rawData_.
3106 * @param {[Object]} data See above.
3109 Dygraph
.prototype.parseDataTable_
= function(data
) {
3110 var shortTextForAnnotationNum
= function(num
) {
3111 // converts [0-9]+ [A-Z][a-z]*
3112 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3113 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3114 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3115 num
= Math
.floor(num
/ 26);
3117 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3118 num
= Math
.floor((num
- 1) / 26);
3123 var cols
= data
.getNumberOfColumns();
3124 var rows
= data
.getNumberOfRows();
3126 var indepType
= data
.getColumnType(0);
3127 if (indepType
== 'date' || indepType
== 'datetime') {
3128 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3129 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3130 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3131 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3132 } else if (indepType
== 'number') {
3133 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3134 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3135 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
3136 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3138 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3139 "column 1 of DataTable input (Got '" + indepType
+ "')");
3143 // Array of the column indices which contain data (and not annotations).
3145 var annotationCols
= {}; // data index -> [annotation cols]
3146 var hasAnnotations
= false;
3148 for (i
= 1; i
< cols
; i
++) {
3149 var type
= data
.getColumnType(i
);
3150 if (type
== 'number') {
3152 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3153 // This is OK -- it's an annotation column.
3154 var dataIdx
= colIdx
[colIdx
.length
- 1];
3155 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3156 annotationCols
[dataIdx
] = [i
];
3158 annotationCols
[dataIdx
].push(i
);
3160 hasAnnotations
= true;
3162 this.error("Only 'number' is supported as a dependent type with Gviz." +
3163 " 'string' is only supported if displayAnnotations is true");
3167 // Read column labels
3168 // TODO(danvk): add support back for errorBars
3169 var labels
= [data
.getColumnLabel(0)];
3170 for (i
= 0; i
< colIdx
.length
; i
++) {
3171 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3172 if (this.attr_("errorBars")) i
+= 1;
3174 this.attrs_
.labels
= labels
;
3175 cols
= labels
.length
;
3178 var outOfOrder
= false;
3179 var annotations
= [];
3180 for (i
= 0; i
< rows
; i
++) {
3182 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3183 data
.getValue(i
, 0) === null) {
3184 this.warn("Ignoring row " + i
+
3185 " of DataTable because of undefined or null first column.");
3189 if (indepType
== 'date' || indepType
== 'datetime') {
3190 row
.push(data
.getValue(i
, 0).getTime());
3192 row
.push(data
.getValue(i
, 0));
3194 if (!this.attr_("errorBars")) {
3195 for (j
= 0; j
< colIdx
.length
; j
++) {
3196 var col
= colIdx
[j
];
3197 row
.push(data
.getValue(i
, col
));
3198 if (hasAnnotations
&&
3199 annotationCols
.hasOwnProperty(col
) &&
3200 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3202 ann
.series
= data
.getColumnLabel(col
);
3204 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3206 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3207 if (k
) ann
.text
+= "\n";
3208 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3210 annotations
.push(ann
);
3214 // Strip out infinities, which give dygraphs problems later on.
3215 for (j
= 0; j
< row
.length
; j
++) {
3216 if (!isFinite(row
[j
])) row
[j
] = null;
3219 for (j
= 0; j
< cols
- 1; j
++) {
3220 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3223 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3230 this.warn("DataTable is out of order; order it correctly to speed loading.");
3231 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3233 this.rawData_
= ret
;
3235 if (annotations
.length
> 0) {
3236 this.setAnnotations(annotations
, true);
3241 * Get the CSV data. If it's in a function, call that function. If it's in a
3242 * file, do an XMLHttpRequest to get it.
3245 Dygraph
.prototype.start_
= function() {
3246 var data
= this.file_
;
3248 // Functions can return references of all other types.
3249 if (typeof data
== 'function') {
3253 if (Dygraph
.isArrayLike(data
)) {
3254 this.rawData_
= this.parseArray_(data
);
3256 } else if (typeof data
== 'object' &&
3257 typeof data
.getColumnRange
== 'function') {
3258 // must be a DataTable from gviz.
3259 this.parseDataTable_(data
);
3261 } else if (typeof data
== 'string') {
3262 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3263 if (data
.indexOf('\n') >= 0) {
3264 this.loadedEvent_(data
);
3266 var req
= new XMLHttpRequest();
3268 req
.onreadystatechange
= function () {
3269 if (req
.readyState
== 4) {
3270 if (req
.status
=== 200 || // Normal http
3271 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3272 caller
.loadedEvent_(req
.responseText
);
3277 req
.open("GET", data
, true);
3281 this.error("Unknown data format: " + (typeof data
));
3286 * Changes various properties of the graph. These can include:
3288 * <li>file: changes the source data for the graph</li>
3289 * <li>errorBars: changes whether the data contains stddev</li>
3292 * There's a huge variety of options that can be passed to this method. For a
3293 * full list, see http://dygraphs.com/options.html.
3295 * @param {Object} attrs The new properties and values
3296 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3297 * call to updateOptions(). If you know better, you can pass true to explicitly
3298 * block the redraw. This can be useful for chaining updateOptions() calls,
3299 * avoiding the occasional infinite loop and preventing redraws when it's not
3300 * necessary (e.g. when updating a callback).
3302 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3303 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3305 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3306 var file
= input_attrs
.file
;
3307 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3309 // TODO(danvk): this is a mess. Move these options into attr_.
3310 if ('rollPeriod' in attrs
) {
3311 this.rollPeriod_
= attrs
.rollPeriod
;
3313 if ('dateWindow' in attrs
) {
3314 this.dateWindow_
= attrs
.dateWindow
;
3315 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3316 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3319 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3320 this.zoomed_y_
= (attrs
.valueRange
!== null);
3323 // TODO(danvk): validate per-series options.
3328 // highlightCircleSize
3330 // Check if this set options will require new points.
3331 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3333 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3337 if (!block_redraw
) this.start_();
3339 if (!block_redraw
) {
3340 if (requiresNewPoints
) {
3343 this.renderGraph_(false, false);
3350 * Returns a copy of the options with deprecated names converted into current
3351 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3352 * interested in that, they should save a copy before calling this.
3355 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3357 for (var k
in attrs
) {
3358 if (k
== 'file') continue;
3359 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3362 var set
= function(axis
, opt
, value
) {
3363 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3364 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3365 my_attrs
.axes
[axis
][opt
] = value
;
3367 var map
= function(opt
, axis
, new_opt
) {
3368 if (typeof(attrs
[opt
]) != 'undefined') {
3369 set(axis
, new_opt
, attrs
[opt
]);
3370 delete my_attrs
[opt
];
3374 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3375 map('xValueFormatter', 'x', 'valueFormatter');
3376 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3377 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3378 map('xTicker', 'x', 'ticker');
3379 map('yValueFormatter', 'y', 'valueFormatter');
3380 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3381 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3382 map('yTicker', 'y', 'ticker');
3387 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3388 * containing div (which has presumably changed size since the dygraph was
3389 * instantiated. If the width/height are specified, the div will be resized.
3391 * This is far more efficient than destroying and re-instantiating a
3392 * Dygraph, since it doesn't have to reparse the underlying data.
3394 * @param {Number} [width] Width (in pixels)
3395 * @param {Number} [height] Height (in pixels)
3397 Dygraph
.prototype.resize
= function(width
, height
) {
3398 if (this.resize_lock
) {
3401 this.resize_lock
= true;
3403 if ((width
=== null) != (height
=== null)) {
3404 this.warn("Dygraph.resize() should be called with zero parameters or " +
3405 "two non-NULL parameters. Pretending it was zero.");
3406 width
= height
= null;
3409 var old_width
= this.width_
;
3410 var old_height
= this.height_
;
3413 this.maindiv_
.style
.width
= width
+ "px";
3414 this.maindiv_
.style
.height
= height
+ "px";
3415 this.width_
= width
;
3416 this.height_
= height
;
3418 this.width_
= this.maindiv_
.clientWidth
;
3419 this.height_
= this.maindiv_
.clientHeight
;
3422 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3423 // TODO(danvk): there should be a clear() method.
3424 this.maindiv_
.innerHTML
= "";
3425 this.roller_
= null;
3426 this.attrs_
.labelsDiv
= null;
3427 this.createInterface_();
3428 if (this.annotations_
.length
) {
3429 // createInterface_ reset the layout, so we need to do this.
3430 this.layout_
.setAnnotations(this.annotations_
);
3435 this.resize_lock
= false;
3439 * Adjusts the number of points in the rolling average. Updates the graph to
3440 * reflect the new averaging period.
3441 * @param {Number} length Number of points over which to average the data.
3443 Dygraph
.prototype.adjustRoll
= function(length
) {
3444 this.rollPeriod_
= length
;
3449 * Returns a boolean array of visibility statuses.
3451 Dygraph
.prototype.visibility
= function() {
3452 // Do lazy-initialization, so that this happens after we know the number of
3454 if (!this.attr_("visibility")) {
3455 this.attrs_
.visibility
= [];
3457 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3458 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3459 this.attrs_
.visibility
.push(true);
3461 return this.attr_("visibility");
3465 * Changes the visiblity of a series.
3467 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3468 var x
= this.visibility();
3469 if (num
< 0 || num
>= x
.length
) {
3470 this.warn("invalid series number in setVisibility: " + num
);
3478 * How large of an area will the dygraph render itself in?
3479 * This is used for testing.
3480 * @return A {width: w, height: h} object.
3483 Dygraph
.prototype.size
= function() {
3484 return { width
: this.width_
, height
: this.height_
};
3488 * Update the list of annotations and redraw the chart.
3489 * See dygraphs.com/annotations.html for more info on how to use annotations.
3490 * @param ann {Array} An array of annotation objects.
3491 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3493 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3494 // Only add the annotation CSS rule once we know it will be used.
3495 Dygraph
.addAnnotationRule();
3496 this.annotations_
= ann
;
3497 this.layout_
.setAnnotations(this.annotations_
);
3498 if (!suppressDraw
) {
3504 * Return the list of annotations.
3506 Dygraph
.prototype.annotations
= function() {
3507 return this.annotations_
;
3511 * Get the list of label names for this graph. The first column is the
3512 * x-axis, so the data series names start at index 1.
3514 Dygraph
.prototype.getLabels
= function(name
) {
3515 return this.attr_("labels").slice();
3519 * Get the index of a series (column) given its name. The first column is the
3520 * x-axis, so the data series start with index 1.
3522 Dygraph
.prototype.indexFromSetName
= function(name
) {
3523 return this.setIndexByName_
[name
];
3527 * Get the internal dataset index given its name. These are numbered starting from 0,
3528 * and only count visible sets.
3531 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3532 return this.datasetIndex_
[this.indexFromSetName(name
)];
3537 * Adds a default style for the annotation CSS classes to the document. This is
3538 * only executed when annotations are actually used. It is designed to only be
3539 * called once -- all calls after the first will return immediately.
3541 Dygraph
.addAnnotationRule
= function() {
3542 if (Dygraph
.addedAnnotationCSS
) return;
3544 var rule
= "border: 1px solid black; " +
3545 "background-color: white; " +
3546 "text-align: center;";
3548 var styleSheetElement
= document
.createElement("style");
3549 styleSheetElement
.type
= "text/css";
3550 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3552 // Find the first style sheet that we can access.
3553 // We may not add a rule to a style sheet from another domain for security
3554 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3555 // adds its own style sheets from google.com.
3556 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3557 if (document
.styleSheets
[i
].disabled
) continue;
3558 var mysheet
= document
.styleSheets
[i
];
3560 if (mysheet
.insertRule
) { // Firefox
3561 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3562 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3563 } else if (mysheet
.addRule
) { // IE
3564 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3566 Dygraph
.addedAnnotationCSS
= true;
3569 // Was likely a security exception.
3573 this.warn("Unable to add default annotation CSS rule; display may be off.");
3576 // Older pages may still use this name.
3577 var DateGraph
= Dygraph
;