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,
192 // TODO(danvk): move defaults from createStatusMessage_ here.
194 labelsSeparateLines
: false,
195 labelsShowZeroValues
: true,
198 showLabelsOnHighlight
: true,
200 digitsAfterDecimal
: 2,
207 axisLabelFontSize
: 14,
213 xValueParser
: Dygraph
.dateParser
,
220 wilsonInterval
: true, // only relevant if fractions is true
224 connectSeparatedPoints
: false,
227 hideOverlayOnMouseOut
: true,
229 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
230 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
235 // Sizes of the various chart labels.
242 axisLineColor
: "black",
245 axisLabelColor
: "black",
246 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
250 gridLineColor
: "rgb(128,128,128)",
252 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
253 animatedZooms
: false, // (for now)
255 // Range selector options
256 showRangeSelector
: false,
257 rangeSelectorHeight
: 40,
258 rangeSelectorPlotStrokeColor
: "#808FAB",
259 rangeSelectorPlotFillColor
: "#A7B1C4",
265 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
266 valueFormatter
: Dygraph
.dateString_
,
267 ticker
: null // will be set in dygraph-tickers.js
271 valueFormatter
: Dygraph
.numberValueFormatter
,
272 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
273 ticker
: null // will be set in dygraph-tickers.js
277 valueFormatter
: Dygraph
.numberValueFormatter
,
278 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
279 ticker
: null // will be set in dygraph-tickers.js
284 // Directions for panning and zooming. Use bit operations when combined
285 // values are possible.
286 Dygraph
.HORIZONTAL
= 1;
287 Dygraph
.VERTICAL
= 2;
289 // Used for initializing annotation CSS rules only once.
290 Dygraph
.addedAnnotationCSS
= false;
292 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
293 // Labels is no longer a constructor parameter, since it's typically set
294 // directly from the data source. It also conains a name for the x-axis,
295 // which the previous constructor form did not.
296 if (labels
!== null) {
297 var new_labels
= ["Date"];
298 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
299 Dygraph
.update(attrs
, { 'labels': new_labels
});
301 this.__init__(div
, file
, attrs
);
305 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
306 * and context <canvas> inside of it. See the constructor for details.
308 * @param {Element} div the Element to render the graph into.
309 * @param {String | Function} file Source data
310 * @param {Object} attrs Miscellaneous other options
313 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
314 // Hack for IE: if we're using excanvas and the document hasn't finished
315 // loading yet (and hence may not have initialized whatever it needs to
316 // initialize), then keep calling this routine periodically until it has.
317 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
318 typeof(G_vmlCanvasManager
) != 'undefined' &&
319 document
.readyState
!= 'complete') {
321 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
325 // Support two-argument constructor
326 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
328 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
331 Dygraph
.error("Constructing dygraph with a non-existent div!");
335 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
337 // Copy the important bits into the object
338 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
341 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
342 this.previousVerticalX_
= -1;
343 this.fractions_
= attrs
.fractions
|| false;
344 this.dateWindow_
= attrs
.dateWindow
|| null;
346 this.is_initial_draw_
= true;
347 this.annotations_
= [];
349 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
350 this.zoomed_x_
= false;
351 this.zoomed_y_
= false;
353 // Clear the div. This ensure that, if multiple dygraphs are passed the same
354 // div, then only one will be drawn.
357 // For historical reasons, the 'width' and 'height' options trump all CSS
358 // rules _except_ for an explicit 'width' or 'height' on the div.
359 // As an added convenience, if the div has zero height (like <div></div> does
360 // without any styles), then we use a default height/width
.
361 if (div
.style
.width
=== '' && attrs
.width
) {
362 div
.style
.width
= attrs
.width
+ "px";
364 if (div
.style
.height
=== '' && attrs
.height
) {
365 div
.style
.height
= attrs
.height
+ "px";
367 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
368 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
369 if (div
.style
.width
=== '') {
370 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
373 // these will be zero if the dygraph's div is hidden.
374 this.width_
= div
.clientWidth
;
375 this.height_
= div
.clientHeight
;
377 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
378 if (attrs
.stackedGraph
) {
379 attrs
.fillGraph
= true;
380 // TODO(nikhilk): Add any other stackedGraph checks here.
383 // Dygraphs has many options, some of which interact with one another.
384 // To keep track of everything, we maintain two sets of options:
386 // this.user_attrs_ only options explicitly set by the user.
387 // this.attrs_ defaults, options derived from user_attrs_, data.
389 // Options are then accessed this.attr_('attr'), which first looks at
390 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
391 // defaults without overriding behavior that the user specifically asks for.
392 this.user_attrs_
= {};
393 Dygraph
.update(this.user_attrs_
, attrs
);
395 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
397 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
399 this.boundaryIds_
= [];
401 // Create the containing DIV and other interactive elements
402 this.createInterface_();
408 * Returns the zoomed status of the chart for one or both axes.
410 * Axis is an optional parameter. Can be set to 'x' or 'y'.
412 * The zoomed status for an axis is set whenever a user zooms using the mouse
413 * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom
414 * option is also specified).
416 Dygraph
.prototype.isZoomed
= function(axis
) {
417 if (axis
== null) return this.zoomed_x_
|| this.zoomed_y_
;
418 if (axis
=== 'x') return this.zoomed_x_
;
419 if (axis
=== 'y') return this.zoomed_y_
;
420 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
424 * Returns information about the Dygraph object, including its containing ID.
426 Dygraph
.prototype.toString
= function() {
427 var maindiv
= this.maindiv_
;
428 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
429 return "[Dygraph " + id
+ "]";
434 * Returns the value of an option. This may be set by the user (either in the
435 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
437 * @param { String } name The name of the option, e.g. 'rollPeriod'.
438 * @param { String } [seriesName] The name of the series to which the option
439 * will be applied. If no per-series value of this option is available, then
440 * the global value is returned. This is optional.
441 * @return { ... } The value of the option.
443 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
444 // <REMOVE_FOR_COMBINED>
445 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
446 this.error('Must include options reference JS for testing');
447 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
448 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
449 'in the Dygraphs.OPTIONS_REFERENCE listing.');
450 // Only log this error once.
451 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
453 // </REMOVE_FOR_COMBINED
>
455 typeof(this.user_attrs_
[seriesName
]) != 'undefined' &&
456 this.user_attrs_
[seriesName
] !== null &&
457 typeof(this.user_attrs_
[seriesName
][name
]) != 'undefined') {
458 return this.user_attrs_
[seriesName
][name
];
459 } else if (typeof(this.user_attrs_
[name
]) != 'undefined') {
460 return this.user_attrs_
[name
];
461 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
462 return this.attrs_
[name
];
470 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
471 * @return { ... } A function mapping string -> option value
473 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
475 return function(opt
) {
476 var axis_opts
= self
.user_attrs_
.axes
;
477 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
478 return axis_opts
[axis
][opt
];
480 // user-specified attributes always trump defaults, even if they're less
482 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
483 return self
.user_attrs_
[opt
];
486 axis_opts
= self
.attrs_
.axes
;
487 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
488 return axis_opts
[axis
][opt
];
490 // check old-style axis options
491 // TODO(danvk): add a deprecation warning if either of these match.
492 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
493 return self
.axes_
[0][opt
];
494 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
495 return self
.axes_
[1][opt
];
497 return self
.attr_(opt
);
502 * Returns the current rolling period, as set by the user or an option.
503 * @return {Number} The number of points in the rolling window
505 Dygraph
.prototype.rollPeriod
= function() {
506 return this.rollPeriod_
;
510 * Returns the currently-visible x-range. This can be affected by zooming,
511 * panning or a call to updateOptions.
512 * Returns a two-element array: [left, right].
513 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
515 Dygraph
.prototype.xAxisRange
= function() {
516 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
520 * Returns the lower- and upper-bound x-axis values of the
523 Dygraph
.prototype.xAxisExtremes
= function() {
524 var left
= this.rawData_
[0][0];
525 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
526 return [left
, right
];
530 * Returns the currently-visible y-range for an axis. This can be affected by
531 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
532 * called with no arguments, returns the range of the first axis.
533 * Returns a two-element array: [bottom, top].
535 Dygraph
.prototype.yAxisRange
= function(idx
) {
536 if (typeof(idx
) == "undefined") idx
= 0;
537 if (idx
< 0 || idx
>= this.axes_
.length
) {
540 var axis
= this.axes_
[idx
];
541 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
545 * Returns the currently-visible y-ranges for each axis. This can be affected by
546 * zooming, panning, calls to updateOptions, etc.
547 * Returns an array of [bottom, top] pairs, one for each y-axis.
549 Dygraph
.prototype.yAxisRanges
= function() {
551 for (var i
= 0; i
< this.axes_
.length
; i
++) {
552 ret
.push(this.yAxisRange(i
));
557 // TODO(danvk): use these functions throughout dygraphs.
559 * Convert from data coordinates to canvas/div X/Y coordinates.
560 * If specified, do this conversion for the coordinate system of a particular
561 * axis. Uses the first axis by default.
562 * Returns a two-element array: [X, Y]
564 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
565 * instead of toDomCoords(null, y, axis).
567 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
568 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
572 * Convert from data x coordinates to canvas/div X coordinate.
573 * If specified, do this conversion for the coordinate system of a particular
575 * Returns a single value or null if x is null.
577 Dygraph
.prototype.toDomXCoord
= function(x
) {
582 var area
= this.plotter_
.area
;
583 var xRange
= this.xAxisRange();
584 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
588 * Convert from data x coordinates to canvas/div Y coordinate and optional
589 * axis. Uses the first axis by default.
591 * returns a single value or null if y is null.
593 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
594 var pct
= this.toPercentYCoord(y
, axis
);
599 var area
= this.plotter_
.area
;
600 return area
.y
+ pct
* area
.h
;
604 * Convert from canvas/div coords to data coordinates.
605 * If specified, do this conversion for the coordinate system of a particular
606 * axis. Uses the first axis by default.
607 * Returns a two-element array: [X, Y].
609 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
610 * instead of toDataCoords(null, y, axis).
612 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
613 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
617 * Convert from canvas/div x coordinate to data coordinate.
619 * If x is null, this returns null.
621 Dygraph
.prototype.toDataXCoord
= function(x
) {
626 var area
= this.plotter_
.area
;
627 var xRange
= this.xAxisRange();
628 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
632 * Convert from canvas/div y coord to value.
634 * If y is null, this returns null.
635 * if axis is null, this uses the first axis.
637 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
642 var area
= this.plotter_
.area
;
643 var yRange
= this.yAxisRange(axis
);
645 if (typeof(axis
) == "undefined") axis
= 0;
646 if (!this.axes_
[axis
].logscale
) {
647 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
649 // Computing the inverse of toDomCoord.
650 var pct
= (y
- area
.y
) / area
.h
;
652 // Computing the inverse of toPercentYCoord. The function was arrived at with
653 // the following steps:
655 // Original calcuation:
656 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
658 // Move denominator to both sides:
659 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
661 // subtract logr1, and take the negative value.
662 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
664 // Swap both sides of the equation, and we can compute the log of the
665 // return value. Which means we just need to use that as the exponent in
667 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
669 var logr1
= Dygraph
.log10(yRange
[1]);
670 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
671 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
677 * Converts a y for an axis to a percentage from the top to the
678 * bottom of the drawing area.
680 * If the coordinate represents a value visible on the canvas, then
681 * the value will be between 0 and 1, where 0 is the top of the canvas.
682 * However, this method will return values outside the range, as
683 * values can fall outside the canvas.
685 * If y is null, this returns null.
686 * if axis is null, this uses the first axis.
688 * @param { Number } y The data y-coordinate.
689 * @param { Number } [axis] The axis number on which the data coordinate lives.
690 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
692 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
696 if (typeof(axis
) == "undefined") axis
= 0;
698 var yRange
= this.yAxisRange(axis
);
701 if (!this.axes_
[axis
].logscale
) {
702 // yRange[1] - y is unit distance from the bottom.
703 // yRange[1] - yRange[0] is the scale of the range.
704 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
705 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
707 var logr1
= Dygraph
.log10(yRange
[1]);
708 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
714 * Converts an x value to a percentage from the left to the right of
717 * If the coordinate represents a value visible on the canvas, then
718 * the value will be between 0 and 1, where 0 is the left of the canvas.
719 * However, this method will return values outside the range, as
720 * values can fall outside the canvas.
722 * If x is null, this returns null.
723 * @param { Number } x The data x-coordinate.
724 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
726 Dygraph
.prototype.toPercentXCoord
= function(x
) {
731 var xRange
= this.xAxisRange();
732 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
736 * Returns the number of columns (including the independent variable).
737 * @return { Integer } The number of columns.
739 Dygraph
.prototype.numColumns
= function() {
740 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
744 * Returns the number of rows (excluding any header/label row).
745 * @return { Integer } The number of rows, less any header.
747 Dygraph
.prototype.numRows
= function() {
748 return this.rawData_
.length
;
752 * Returns the full range of the x-axis, as determined by the most extreme
753 * values in the data set. Not affected by zooming, visibility, etc.
754 * TODO(danvk): merge w/ xAxisExtremes
755 * @return { Array<Number> } A [low, high] pair
758 Dygraph
.prototype.fullXRange_
= function() {
759 if (this.numRows() > 0) {
760 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
767 * Returns the value in the given row and column. If the row and column exceed
768 * the bounds on the data, returns null. Also returns null if the value is
770 * @param { Number} row The row number of the data (0-based). Row 0 is the
771 * first row of data, not a header row.
772 * @param { Number} col The column number of the data (0-based)
773 * @return { Number } The value in the specified cell or null if the row/col
776 Dygraph
.prototype.getValue
= function(row
, col
) {
777 if (row
< 0 || row
> this.rawData_
.length
) return null;
778 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
780 return this.rawData_
[row
][col
];
784 * Generates interface elements for the Dygraph: a containing div, a div to
785 * display the current point, and a textbox to adjust the rolling average
786 * period. Also creates the Renderer/Layout elements.
789 Dygraph
.prototype.createInterface_
= function() {
790 // Create the all-enclosing graph div
791 var enclosing
= this.maindiv_
;
793 this.graphDiv
= document
.createElement("div");
794 this.graphDiv
.style
.width
= this.width_
+ "px";
795 this.graphDiv
.style
.height
= this.height_
+ "px";
796 enclosing
.appendChild(this.graphDiv
);
798 // Create the canvas for interactive parts of the chart.
799 this.canvas_
= Dygraph
.createCanvas();
800 this.canvas_
.style
.position
= "absolute";
801 this.canvas_
.width
= this.width_
;
802 this.canvas_
.height
= this.height_
;
803 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
804 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
806 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
808 // ... and for static parts of the chart.
809 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
810 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
812 if (this.attr_('showRangeSelector')) {
813 // The range selector must be created here so that its canvases and contexts get created here.
814 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
815 // The range selector also sets xAxisHeight in order to reserve space.
816 this.rangeSelector_
= new DygraphRangeSelector(this);
819 // The interactive parts of the graph are drawn on top of the chart.
820 this.graphDiv
.appendChild(this.hidden_
);
821 this.graphDiv
.appendChild(this.canvas_
);
822 this.mouseEventElement_
= this.createMouseEventElement_();
824 // Create the grapher
825 this.layout_
= new DygraphLayout(this);
827 if (this.rangeSelector_
) {
828 // This needs to happen after the graph canvases are added to the div and the layout object is created.
829 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
833 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(e
) {
834 dygraph
.mouseMove_(e
);
836 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(e
) {
837 dygraph
.mouseOut_(e
);
840 this.createStatusMessage_();
841 this.createDragInterface_();
843 // Update when the window is resized.
844 // TODO(danvk): drop frames depending on complexity of the chart.
845 Dygraph
.addEvent(window
, 'resize', function(e
) {
851 * Detach DOM elements in the dygraph and null out all data references.
852 * Calling this when you're done with a dygraph can dramatically reduce memory
853 * usage. See, e.g., the tests/perf.html example.
855 Dygraph
.prototype.destroy
= function() {
856 var removeRecursive
= function(node
) {
857 while (node
.hasChildNodes()) {
858 removeRecursive(node
.firstChild
);
859 node
.removeChild(node
.firstChild
);
862 removeRecursive(this.maindiv_
);
864 var nullOut
= function(obj
) {
866 if (typeof(obj
[n
]) === 'object') {
872 // These may not all be necessary, but it can't hurt...
873 nullOut(this.layout_
);
874 nullOut(this.plotter_
);
879 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
880 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
881 * or the zoom rectangles) is done on this.canvas_.
882 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
883 * @return {Object} The newly-created canvas
886 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
887 var h
= Dygraph
.createCanvas();
888 h
.style
.position
= "absolute";
889 // TODO(danvk): h should be offset from canvas. canvas needs to include
890 // some extra area to make it easier to zoom in on the far left and far
891 // right. h needs to be precisely the plot area, so that clipping occurs.
892 h
.style
.top
= canvas
.style
.top
;
893 h
.style
.left
= canvas
.style
.left
;
894 h
.width
= this.width_
;
895 h
.height
= this.height_
;
896 h
.style
.width
= this.width_
+ "px"; // for IE
897 h
.style
.height
= this.height_
+ "px"; // for IE
902 * Creates an overlay element used to handle mouse events.
903 * @return {Object} The mouse event element.
906 Dygraph
.prototype.createMouseEventElement_
= function() {
907 if (this.isUsingExcanvas_
) {
908 var elem
= document
.createElement("div");
909 elem
.style
.position
= 'absolute';
910 elem
.style
.backgroundColor
= 'white';
911 elem
.style
.filter
= 'alpha(opacity=0)';
912 elem
.style
.width
= this.width_
+ "px";
913 elem
.style
.height
= this.height_
+ "px";
914 this.graphDiv
.appendChild(elem
);
922 * Generate a set of distinct colors for the data series. This is done with a
923 * color wheel. Saturation/Value are customizable, and the hue is
924 * equally-spaced around the color wheel. If a custom set of colors is
925 * specified, that is used instead.
928 Dygraph
.prototype.setColors_
= function() {
929 var num
= this.attr_("labels").length
- 1;
931 var colors
= this.attr_('colors');
934 var sat
= this.attr_('colorSaturation') || 1.0;
935 var val
= this.attr_('colorValue') || 0.5;
936 var half
= Math
.ceil(num
/ 2);
937 for (i
= 1; i
<= num
; i
++) {
938 if (!this.visibility()[i
-1]) continue;
939 // alternate colors for high contrast.
940 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
941 var hue
= (1.0 * idx
/ (1 + num
));
942 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
945 for (i
= 0; i
< num
; i
++) {
946 if (!this.visibility()[i
]) continue;
947 var colorStr
= colors
[i
% colors
.length
];
948 this.colors_
.push(colorStr
);
952 this.plotter_
.setColors(this.colors_
);
956 * Return the list of colors. This is either the list of colors passed in the
957 * attributes or the autogenerated list of rgb(r,g,b) strings.
958 * @return {Array<string>} The list of colors.
960 Dygraph
.prototype.getColors
= function() {
965 * Create the div that contains information on the selected point(s)
966 * This goes in the top right of the canvas, unless an external div has already
970 Dygraph
.prototype.createStatusMessage_
= function() {
971 var userLabelsDiv
= this.user_attrs_
.labelsDiv
;
972 if (userLabelsDiv
&& null !== userLabelsDiv
&&
973 (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
974 this.user_attrs_
.labelsDiv
= document
.getElementById(userLabelsDiv
);
976 if (!this.attr_("labelsDiv")) {
977 var divWidth
= this.attr_('labelsDivWidth');
979 "position": "absolute",
982 "width": divWidth
+ "px",
984 "left": (this.width_
- divWidth
- 2) + "px",
985 "background": "white",
987 "overflow": "hidden"};
988 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
989 var div
= document
.createElement("div");
990 div
.className
= "dygraph-legend";
991 for (var name
in messagestyle
) {
992 if (messagestyle
.hasOwnProperty(name
)) {
993 div
.style
[name
] = messagestyle
[name
];
996 this.graphDiv
.appendChild(div
);
997 this.attrs_
.labelsDiv
= div
;
1002 * Position the labels div so that:
1003 * - its right edge is flush with the right edge of the charting area
1004 * - its top edge is flush with the top edge of the charting area
1007 Dygraph
.prototype.positionLabelsDiv_
= function() {
1008 // Don't touch a user-specified labelsDiv.
1009 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
1011 var area
= this.plotter_
.area
;
1012 var div
= this.attr_("labelsDiv");
1013 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
1014 div
.style
.top
= area
.y
+ "px";
1018 * Create the text box to adjust the averaging period
1021 Dygraph
.prototype.createRollInterface_
= function() {
1022 // Create a roller if one doesn't exist already.
1023 if (!this.roller_
) {
1024 this.roller_
= document
.createElement("input");
1025 this.roller_
.type
= "text";
1026 this.roller_
.style
.display
= "none";
1027 this.graphDiv
.appendChild(this.roller_
);
1030 var display
= this.attr_('showRoller') ? 'block' : 'none';
1032 var area
= this.plotter_
.area
;
1033 var textAttr
= { "position": "absolute",
1035 "top": (area
.y
+ area
.h
- 25) + "px",
1036 "left": (area
.x
+ 1) + "px",
1039 this.roller_
.size
= "2";
1040 this.roller_
.value
= this.rollPeriod_
;
1041 for (var name
in textAttr
) {
1042 if (textAttr
.hasOwnProperty(name
)) {
1043 this.roller_
.style
[name
] = textAttr
[name
];
1048 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1053 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1054 * canvas (i.e. DOM Coords).
1056 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1057 return Dygraph
.pageX(e
) - context
.px
;
1062 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1063 * canvas (i.e. DOM Coords).
1065 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1066 return Dygraph
.pageY(e
) - context
.py
;
1070 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1074 Dygraph
.prototype.createDragInterface_
= function() {
1076 // Tracks whether the mouse is down right now
1078 isPanning
: false, // is this drag part of a pan?
1079 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1080 dragStartX
: null, // pixel coordinates
1081 dragStartY
: null, // pixel coordinates
1082 dragEndX
: null, // pixel coordinates
1083 dragEndY
: null, // pixel coordinates
1084 dragDirection
: null,
1085 prevEndX
: null, // pixel coordinates
1086 prevEndY
: null, // pixel coordinates
1087 prevDragDirection
: null,
1089 // The value on the left side of the graph when a pan operation starts.
1090 initialLeftmostDate
: null,
1092 // The number of units each pixel spans. (This won't be valid for log
1094 xUnitsPerPixel
: null,
1096 // TODO(danvk): update this comment
1097 // The range in second/value units that the viewport encompasses during a
1098 // panning operation.
1101 // Top-left corner of the canvas, in DOM coords
1102 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1106 // Values for use with panEdgeFraction, which limit how far outside the
1107 // graph's data boundaries it can be panned.
1108 boundedDates
: null, // [minDate, maxDate]
1109 boundedValues
: null, // [[minValue, maxValue] ...]
1111 initializeMouseDown
: function(event
, g
, context
) {
1112 // prevents mouse drags from selecting page text.
1113 if (event
.preventDefault
) {
1114 event
.preventDefault(); // Firefox, Chrome, etc.
1116 event
.returnValue
= false; // IE
1117 event
.cancelBubble
= true;
1120 context
.px
= Dygraph
.findPosX(g
.canvas_
);
1121 context
.py
= Dygraph
.findPosY(g
.canvas_
);
1122 context
.dragStartX
= g
.dragGetX_(event
, context
);
1123 context
.dragStartY
= g
.dragGetY_(event
, context
);
1127 var interactionModel
= this.attr_("interactionModel");
1129 // Self is the graph.
1132 // Function that binds the graph and context to the handler.
1133 var bindHandler
= function(handler
) {
1134 return function(event
) {
1135 handler(event
, self
, context
);
1139 for (var eventName
in interactionModel
) {
1140 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1141 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
1142 bindHandler(interactionModel
[eventName
]));
1145 // If the user releases the mouse button during a drag, but not over the
1146 // canvas, then it doesn't count as a zooming action.
1147 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
1148 if (context
.isZooming
|| context
.isPanning
) {
1149 context
.isZooming
= false;
1150 context
.dragStartX
= null;
1151 context
.dragStartY
= null;
1154 if (context
.isPanning
) {
1155 context
.isPanning
= false;
1156 context
.draggingDate
= null;
1157 context
.dateRange
= null;
1158 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1159 delete self
.axes_
[i
].draggingValue
;
1160 delete self
.axes_
[i
].dragValueRange
;
1167 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1168 * up any previous zoom rectangles that were drawn. This could be optimized to
1169 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1172 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1173 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1174 * @param {Number} startX The X position where the drag started, in canvas
1176 * @param {Number} endX The current X position of the drag, in canvas coords.
1177 * @param {Number} startY The Y position where the drag started, in canvas
1179 * @param {Number} endY The current Y position of the drag, in canvas coords.
1180 * @param {Number} prevDirection the value of direction on the previous call to
1181 * this function. Used to avoid excess redrawing
1182 * @param {Number} prevEndX The value of endX on the previous call to this
1183 * function. Used to avoid excess redrawing
1184 * @param {Number} prevEndY The value of endY on the previous call to this
1185 * function. Used to avoid excess redrawing
1188 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1189 endY
, prevDirection
, prevEndX
,
1191 var ctx
= this.canvas_ctx_
;
1193 // Clean up from the previous rect if necessary
1194 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1195 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1196 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1197 } else if (prevDirection
== Dygraph
.VERTICAL
){
1198 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1199 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1202 // Draw a light-grey rectangle to show the new viewing area
1203 if (direction
== Dygraph
.HORIZONTAL
) {
1204 if (endX
&& startX
) {
1205 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1206 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1207 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1209 } else if (direction
== Dygraph
.VERTICAL
) {
1210 if (endY
&& startY
) {
1211 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1212 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1213 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1217 if (this.isUsingExcanvas_
) {
1218 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1223 * Clear the zoom rectangle (and perform no zoom).
1226 Dygraph
.prototype.clearZoomRect_
= function() {
1227 this.currentZoomRectArgs_
= null;
1228 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1232 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1233 * the canvas. The exact zoom window may be slightly larger if there are no data
1234 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1235 * which accepts dates that match the raw data. This function redraws the graph.
1237 * @param {Number} lowX The leftmost pixel value that should be visible.
1238 * @param {Number} highX The rightmost pixel value that should be visible.
1241 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1242 this.currentZoomRectArgs_
= null;
1243 // Find the earliest and latest dates contained in this canvasx range.
1244 // Convert the call to date ranges of the raw data.
1245 var minDate
= this.toDataXCoord(lowX
);
1246 var maxDate
= this.toDataXCoord(highX
);
1247 this.doZoomXDates_(minDate
, maxDate
);
1251 * Transition function to use in animations. Returns values between 0.0
1252 * (totally old values) and 1.0 (totally new values) for each frame.
1255 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1257 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1261 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1262 * method with doZoomX which accepts pixel coordinates. This function redraws
1265 * @param {Number} minDate The minimum date that should be visible.
1266 * @param {Number} maxDate The maximum date that should be visible.
1269 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1270 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1271 // can produce strange effects. Rather than the y-axis transitioning slowly
1272 // between values, it can jerk around.)
1273 var old_window
= this.xAxisRange();
1274 var new_window
= [minDate
, maxDate
];
1275 this.zoomed_x_
= true;
1277 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1278 if (that
.attr_("zoomCallback")) {
1279 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1285 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1286 * the canvas. This function redraws the graph.
1288 * @param {Number} lowY The topmost pixel value that should be visible.
1289 * @param {Number} highY The lowest pixel value that should be visible.
1292 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1293 this.currentZoomRectArgs_
= null;
1294 // Find the highest and lowest values in pixel range for each axis.
1295 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1296 // This is because pixels increase as you go down on the screen, whereas data
1297 // coordinates increase as you go up the screen.
1298 var oldValueRanges
= this.yAxisRanges();
1299 var newValueRanges
= [];
1300 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1301 var hi
= this.toDataYCoord(lowY
, i
);
1302 var low
= this.toDataYCoord(highY
, i
);
1303 newValueRanges
.push([low
, hi
]);
1306 this.zoomed_y_
= true;
1308 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1309 if (that
.attr_("zoomCallback")) {
1310 var xRange
= that
.xAxisRange();
1311 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1317 * Reset the zoom to the original view coordinates. This is the same as
1318 * double-clicking on the graph.
1322 Dygraph
.prototype.doUnzoom_
= function() {
1323 var dirty
= false, dirtyX
= false, dirtyY
= false;
1324 if (this.dateWindow_
!== null) {
1329 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1330 if (this.axes_
[i
].valueWindow
!== null) {
1336 // Clear any selection, since it's likely to be drawn in the wrong place.
1337 this.clearSelection();
1340 this.zoomed_x_
= false;
1341 this.zoomed_y_
= false;
1343 var minDate
= this.rawData_
[0][0];
1344 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1346 // With only one frame, don't bother calculating extreme ranges.
1347 // TODO(danvk): merge this block w/ the code below
.
1348 if (!this.attr_("animatedZooms")) {
1349 this.dateWindow_
= null;
1350 for (i
= 0; i
< this.axes_
.length
; i
++) {
1351 if (this.axes_
[i
].valueWindow
!== null) {
1352 delete this.axes_
[i
].valueWindow
;
1356 if (this.attr_("zoomCallback")) {
1357 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1362 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1364 oldWindow
= this.xAxisRange();
1365 newWindow
= [minDate
, maxDate
];
1369 oldValueRanges
= this.yAxisRanges();
1370 // TODO(danvk): this is pretty inefficient
1371 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1372 var extremes
= packed
[1];
1374 // this has the side-effect of modifying this.axes_.
1375 // this doesn't make much sense in this context, but it's convenient (we
1376 // need this.axes_[*].extremeValues) and not harmful since we'll be
1377 // calling drawGraph_ shortly, which clobbers these values.
1378 this.computeYAxisRanges_(extremes
);
1380 newValueRanges
= [];
1381 for (i
= 0; i
< this.axes_
.length
; i
++) {
1382 newValueRanges
.push(this.axes_
[i
].extremeRange
);
1387 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1389 that
.dateWindow_
= null;
1390 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1391 if (that
.axes_
[i
].valueWindow
!== null) {
1392 delete that
.axes_
[i
].valueWindow
;
1395 if (that
.attr_("zoomCallback")) {
1396 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1403 * Combined animation logic for all zoom functions.
1404 * either the x parameters or y parameters may be null.
1407 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1408 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1411 var valueRanges
= [];
1414 if (oldXRange
!== null && newXRange
!== null) {
1415 for (step
= 1; step
<= steps
; step
++) {
1416 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1417 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1418 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1422 if (oldYRanges
!== null && newYRanges
!== null) {
1423 for (step
= 1; step
<= steps
; step
++) {
1424 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1426 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1427 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1428 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1430 valueRanges
[step
-1] = thisRange
;
1435 Dygraph
.repeatAndCleanup(function(step
) {
1436 if (valueRanges
.length
) {
1437 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1438 var w
= valueRanges
[step
][i
];
1439 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1442 if (windows
.length
) {
1443 that
.dateWindow_
= windows
[step
];
1446 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1450 * When the mouse moves in the canvas, display information about a nearby data
1451 * point and draw dots over those points in the data series. This function
1452 * takes care of cleanup of previously-drawn dots.
1453 * @param {Object} event The mousemove event from the browser.
1456 Dygraph
.prototype.mouseMove_
= function(event
) {
1457 // This prevents JS errors when mousing over the canvas before data loads.
1458 var points
= this.layout_
.points
;
1459 if (points
=== undefined
) return;
1461 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1466 // Loop through all the points and find the date nearest to our current
1468 var minDist
= 1e+100;
1470 for (i
= 0; i
< points
.length
; i
++) {
1471 var point
= points
[i
];
1472 if (point
=== null) continue;
1473 var dist
= Math
.abs(point
.canvasx
- canvasx
);
1474 if (dist
> minDist
) continue;
1478 if (idx
>= 0) lastx
= points
[idx
].xval
;
1480 // Extract the points we've selected
1481 this.selPoints_
= [];
1482 var l
= points
.length
;
1483 if (!this.attr_("stackedGraph")) {
1484 for (i
= 0; i
< l
; i
++) {
1485 if (points
[i
].xval
== lastx
) {
1486 this.selPoints_
.push(points
[i
]);
1490 // Need to 'unstack' points starting from the bottom
1491 var cumulative_sum
= 0;
1492 for (i
= l
- 1; i
>= 0; i
--) {
1493 if (points
[i
].xval
== lastx
) {
1494 var p
= {}; // Clone the point since we modify it
1495 for (var k
in points
[i
]) {
1496 p
[k
] = points
[i
][k
];
1498 p
.yval
-= cumulative_sum
;
1499 cumulative_sum
+= p
.yval
;
1500 this.selPoints_
.push(p
);
1503 this.selPoints_
.reverse();
1506 if (this.attr_("highlightCallback")) {
1507 var px
= this.lastx_
;
1508 if (px
!== null && lastx
!= px
) {
1509 // only fire if the selected point has changed.
1510 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
, this.idxToRow_(idx
));
1514 // Save last x position for callbacks.
1515 this.lastx_
= lastx
;
1517 this.updateSelection_();
1521 * Transforms layout_.points index into data row number.
1522 * @param int layout_.points index
1523 * @return int row number, or -1 if none could be found.
1526 Dygraph
.prototype.idxToRow_
= function(idx
) {
1527 if (idx
< 0) return -1;
1529 for (var i
in this.layout_
.datasets
) {
1530 if (idx
< this.layout_
.datasets
[i
].length
) {
1531 return this.boundaryIds_
[0][0]+idx
;
1533 idx
-= this.layout_
.datasets
[i
].length
;
1540 * Generates HTML for the legend which is displayed when hovering over the
1541 * chart. If no selected points are specified, a default legend is returned
1542 * (this may just be the empty string).
1543 * @param { Number } [x] The x-value of the selected points.
1544 * @param { [Object] } [sel_points] List of selected points for the given
1545 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1547 Dygraph
.prototype.generateLegendHTML_
= function(x
, sel_points
) {
1548 // If no points are selected, we display a default legend. Traditionally,
1549 // this has been blank. But a better default would be a conventional legend,
1550 // which provides essential information for a non-interactive chart.
1551 var html
, sepLines
, i
, c
;
1552 if (typeof(x
) === 'undefined') {
1553 if (this.attr_('legend') != 'always') return '';
1555 sepLines
= this.attr_('labelsSeparateLines');
1556 var labels
= this.attr_('labels');
1558 for (i
= 1; i
< labels
.length
; i
++) {
1559 if (!this.visibility()[i
- 1]) continue;
1560 c
= this.plotter_
.colors
[labels
[i
]];
1561 if (html
!== '') html
+= (sepLines
? '<br/>' : ' ');
1562 html
+= "<b><span style='color: " + c
+ ";'>—" + labels
[i
] +
1568 var xOptView
= this.optionsViewForAxis_('x');
1569 var xvf
= xOptView('valueFormatter');
1570 html
= xvf(x
, xOptView
, this.attr_('labels')[0], this) + ":";
1573 var num_axes
= this.numAxes();
1574 for (i
= 0; i
< num_axes
; i
++) {
1575 yOptViews
[i
] = this.optionsViewForAxis_('y' + (i
? 1 + i
: ''));
1577 var showZeros
= this.attr_("labelsShowZeroValues");
1578 sepLines
= this.attr_("labelsSeparateLines");
1579 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1580 var pt
= this.selPoints_
[i
];
1581 if (pt
.yval
=== 0 && !showZeros
) continue;
1582 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1583 if (sepLines
) html
+= "<br/>";
1585 var yOptView
= yOptViews
[this.seriesToAxisMap_
[pt
.name
]];
1586 var fmtFunc
= yOptView('valueFormatter');
1587 c
= this.plotter_
.colors
[pt
.name
];
1588 var yval
= fmtFunc(pt
.yval
, yOptView
, pt
.name
, this);
1590 // TODO(danvk): use a template string here and make it an attribute.
1591 html
+= " <b><span style='color: " + c
+ ";'>" + pt
.name
+
1592 "</span></b>:" + yval
;
1599 * Displays information about the selected points in the legend. If there is no
1600 * selection, the legend will be cleared.
1601 * @param { Number } [x] The x-value of the selected points.
1602 * @param { [Object] } [sel_points] List of selected points for the given
1603 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1605 Dygraph
.prototype.setLegendHTML_
= function(x
, sel_points
) {
1606 var html
= this.generateLegendHTML_(x
, sel_points
);
1607 var labelsDiv
= this.attr_("labelsDiv");
1608 if (labelsDiv
!== null) {
1609 labelsDiv
.innerHTML
= html
;
1611 if (typeof(this.shown_legend_error_
) == 'undefined') {
1612 this.error('labelsDiv is set to something nonexistent; legend will not be shown.');
1613 this.shown_legend_error_
= true;
1619 * Draw dots over the selectied points in the data series. This function
1620 * takes care of cleanup of previously-drawn dots.
1623 Dygraph
.prototype.updateSelection_
= function() {
1624 // Clear the previously drawn vertical, if there is one
1626 var ctx
= this.canvas_ctx_
;
1627 if (this.previousVerticalX_
>= 0) {
1628 // Determine the maximum highlight circle size.
1629 var maxCircleSize
= 0;
1630 var labels
= this.attr_('labels');
1631 for (i
= 1; i
< labels
.length
; i
++) {
1632 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1633 if (r
> maxCircleSize
) maxCircleSize
= r
;
1635 var px
= this.previousVerticalX_
;
1636 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1637 2 * maxCircleSize
+ 2, this.height_
);
1640 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1641 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1644 if (this.selPoints_
.length
> 0) {
1645 // Set the status message to indicate the selected point(s)
1646 if (this.attr_('showLabelsOnHighlight')) {
1647 this.setLegendHTML_(this.lastx_
, this.selPoints_
);
1650 // Draw colored circles over the center of each selected point
1651 var canvasx
= this.selPoints_
[0].canvasx
;
1653 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1654 var pt
= this.selPoints_
[i
];
1655 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1657 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1658 var callback
= this.attr_("drawHighlightCallback", pt
.name
);
1660 callback
= Dygraph
.Circles
.DEFAULT
;
1662 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1663 this.plotter_
.colors
[pt
.name
], circleSize
);
1667 this.previousVerticalX_
= canvasx
;
1672 * Manually set the selected points and display information about them in the
1673 * legend. The selection can be cleared using clearSelection() and queried
1674 * using getSelection().
1675 * @param { Integer } row number that should be highlighted (i.e. appear with
1676 * hover dots on the chart). Set to false to clear any selection.
1678 Dygraph
.prototype.setSelection
= function(row
) {
1679 // Extract the points we've selected
1680 this.selPoints_
= [];
1683 if (row
!== false) {
1684 row
= row
- this.boundaryIds_
[0][0];
1687 if (row
!== false && row
>= 0) {
1688 for (var i
in this.layout_
.datasets
) {
1689 if (row
< this.layout_
.datasets
[i
].length
) {
1690 var point
= this.layout_
.points
[pos
+row
];
1692 if (this.attr_("stackedGraph")) {
1693 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1696 this.selPoints_
.push(point
);
1698 pos
+= this.layout_
.datasets
[i
].length
;
1702 if (this.selPoints_
.length
) {
1703 this.lastx_
= this.selPoints_
[0].xval
;
1704 this.updateSelection_();
1706 this.clearSelection();
1712 * The mouse has left the canvas. Clear out whatever artifacts remain
1713 * @param {Object} event the mouseout event from the browser.
1716 Dygraph
.prototype.mouseOut_
= function(event
) {
1717 if (this.attr_("unhighlightCallback")) {
1718 this.attr_("unhighlightCallback")(event
);
1721 if (this.attr_("hideOverlayOnMouseOut")) {
1722 this.clearSelection();
1727 * Clears the current selection (i.e. points that were highlighted by moving
1728 * the mouse over the chart).
1730 Dygraph
.prototype.clearSelection
= function() {
1731 // Get rid of the overlay data
1732 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
1733 this.setLegendHTML_();
1734 this.selPoints_
= [];
1739 * Returns the number of the currently selected row. To get data for this row,
1740 * you can use the getValue method.
1741 * @return { Integer } row number, or -1 if nothing is selected
1743 Dygraph
.prototype.getSelection
= function() {
1744 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1748 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1749 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1750 return row
+ this.boundaryIds_
[0][0];
1757 * Fires when there's data available to be graphed.
1758 * @param {String} data Raw CSV data to be plotted
1761 Dygraph
.prototype.loadedEvent_
= function(data
) {
1762 this.rawData_
= this.parseCSV_(data
);
1767 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1770 Dygraph
.prototype.addXTicks_
= function() {
1771 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1773 if (this.dateWindow_
) {
1774 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
1776 range
= this.fullXRange_();
1779 var xAxisOptionsView
= this.optionsViewForAxis_('x');
1780 var xTicks
= xAxisOptionsView('ticker')(
1783 this.width_
, // TODO(danvk): should be area.width
1786 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
1787 // console.log(msg);
1788 this.layout_
.setXTicks(xTicks
);
1793 * Computes the range of the data series (including confidence intervals).
1794 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
1795 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1796 * @return [low, high]
1798 Dygraph
.prototype.extremeValues_
= function(series
) {
1799 var minY
= null, maxY
= null, j
, y
;
1801 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1803 // With custom bars, maxY is the max of the high values.
1804 for (j
= 0; j
< series
.length
; j
++) {
1805 y
= series
[j
][1][0];
1807 var low
= y
- series
[j
][1][1];
1808 var high
= y
+ series
[j
][1][2];
1809 if (low
> y
) low
= y
; // this can happen with custom bars,
1810 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1811 if (maxY
=== null || high
> maxY
) {
1814 if (minY
=== null || low
< minY
) {
1819 for (j
= 0; j
< series
.length
; j
++) {
1821 if (y
=== null || isNaN(y
)) continue;
1822 if (maxY
=== null || y
> maxY
) {
1825 if (minY
=== null || y
< minY
) {
1831 return [minY
, maxY
];
1836 * This function is called once when the chart's data is changed or the options
1837 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1838 * idea is that values derived from the chart's data can be computed here,
1839 * rather than every time the chart is drawn. This includes things like the
1840 * number of axes, rolling averages, etc.
1842 Dygraph
.prototype.predraw_
= function() {
1843 var start
= new Date();
1845 // TODO(danvk): move more computations out of drawGraph_ and into here.
1846 this.computeYAxes_();
1848 // Create a new plotter.
1849 if (this.plotter_
) this.plotter_
.clear();
1850 this.plotter_
= new DygraphCanvasRenderer(this,
1855 // The roller sits in the bottom left corner of the chart. We don't know where
1856 // this will be until the options are available, so it's positioned here.
1857 this.createRollInterface_();
1859 // Same thing applies for the labelsDiv. It's right edge should be flush with
1860 // the right edge of the charting area (which may not be the same as the right
1861 // edge of the div, if we have two y-axes.
1862 this.positionLabelsDiv_();
1864 if (this.rangeSelector_
) {
1865 this.rangeSelector_
.renderStaticLayer();
1868 // Convert the raw data (a 2D array) into the internal format and compute
1869 // rolling averages.
1870 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
1871 for (var i
= 1; i
< this.numColumns(); i
++) {
1872 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
1873 var logScale
= this.attr_('logscale', i
);
1874 var series
= this.extractSeries_(this.rawData_
, i
, logScale
, connectSeparatedPoints
);
1875 series
= this.rollingAverage(series
, this.rollPeriod_
);
1876 this.rolledSeries_
.push(series
);
1879 // If the data or options have changed, then we'd better redraw.
1882 // This is used to determine whether to do various animations.
1883 var end
= new Date();
1884 this.drawingTimeMs_
= (end
- start
);
1888 * Loop over all fields and create datasets, calculating extreme y-values for
1889 * each series and extreme x-indices as we go.
1891 * dateWindow is passed in as an explicit parameter so that we can compute
1892 * extreme values "speculatively", i.e. without actually setting state on the
1895 * TODO(danvk): make this more of a true function
1896 * @return [ datasets, seriesExtremes, boundaryIds ]
1899 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
1900 var boundaryIds
= [];
1901 var cumulative_y
= []; // For stacked series.
1903 var extremes
= {}; // series name -> [low, high]
1906 // Loop over the fields (series). Go from the last to the first,
1907 // because if they're stacked that's how we accumulate the values.
1908 var num_series
= rolledSeries
.length
- 1;
1909 for (i
= num_series
; i
>= 1; i
--) {
1910 if (!this.visibility()[i
- 1]) continue;
1912 // TODO(danvk): is this copy really necessary?
1914 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
1915 series
.push(rolledSeries
[i
][j
]);
1918 // Prune down to the desired range, if necessary (for zooming)
1919 // Because there can be lines going to points outside of the visible area,
1920 // we actually prune to visible points, plus one on either side.
1921 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1923 var low
= dateWindow
[0];
1924 var high
= dateWindow
[1];
1926 // TODO(danvk): do binary search instead of linear search.
1927 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1928 var firstIdx
= null, lastIdx
= null;
1929 for (k
= 0; k
< series
.length
; k
++) {
1930 if (series
[k
][0] >= low
&& firstIdx
=== null) {
1933 if (series
[k
][0] <= high
) {
1937 if (firstIdx
=== null) firstIdx
= 0;
1938 if (firstIdx
> 0) firstIdx
--;
1939 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
1940 if (lastIdx
< series
.length
- 1) lastIdx
++;
1941 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
1942 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
1943 pruned
.push(series
[k
]);
1947 boundaryIds
[i
-1] = [0, series
.length
-1];
1950 var seriesExtremes
= this.extremeValues_(series
);
1953 for (j
=0; j
<series
.length
; j
++) {
1954 series
[j
] = [series
[j
][0],
1959 } else if (this.attr_("stackedGraph")) {
1960 var l
= series
.length
;
1962 for (j
= 0; j
< l
; j
++) {
1963 // If one data set has a NaN, let all subsequent stacked
1964 // sets inherit the NaN -- only start at 0 for the first set.
1965 var x
= series
[j
][0];
1966 if (cumulative_y
[x
] === undefined
) {
1967 cumulative_y
[x
] = 0;
1970 actual_y
= series
[j
][1];
1971 cumulative_y
[x
] += actual_y
;
1973 series
[j
] = [x
, cumulative_y
[x
]];
1975 if (cumulative_y
[x
] > seriesExtremes
[1]) {
1976 seriesExtremes
[1] = cumulative_y
[x
];
1978 if (cumulative_y
[x
] < seriesExtremes
[0]) {
1979 seriesExtremes
[0] = cumulative_y
[x
];
1984 var seriesName
= this.attr_("labels")[i
];
1985 extremes
[seriesName
] = seriesExtremes
;
1986 datasets
[i
] = series
;
1989 return [ datasets
, extremes
, boundaryIds
];
1993 * Update the graph with new data. This method is called when the viewing area
1994 * has changed. If the underlying data or options have changed, predraw_ will
1995 * be called before drawGraph_ is called.
1997 * clearSelection, when undefined or true, causes this.clearSelection to be
1998 * called at the end of the draw operation. This should rarely be defined,
1999 * and never true (that is it should be undefined most of the time, and
2004 Dygraph
.prototype.drawGraph_
= function(clearSelection
) {
2005 var start
= new Date();
2007 if (typeof(clearSelection
) === 'undefined') {
2008 clearSelection
= true;
2011 // This is used to set the second parameter to drawCallback, below.
2012 var is_initial_draw
= this.is_initial_draw_
;
2013 this.is_initial_draw_
= false;
2015 this.layout_
.removeAllDatasets();
2017 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2019 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2020 var datasets
= packed
[0];
2021 var extremes
= packed
[1];
2022 this.boundaryIds_
= packed
[2];
2024 for (var i
= 1; i
< datasets
.length
; i
++) {
2025 if (!this.visibility()[i
- 1]) continue;
2026 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
2029 this.computeYAxisRanges_(extremes
);
2030 this.layout_
.setYAxes(this.axes_
);
2034 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2035 var tmp_zoomed_x
= this.zoomed_x_
;
2036 // Tell PlotKit to use this new data and render itself
2037 this.layout_
.setDateWindow(this.dateWindow_
);
2038 this.zoomed_x_
= tmp_zoomed_x
;
2039 this.layout_
.evaluateWithError();
2040 this.renderGraph_(is_initial_draw
, false);
2042 if (this.attr_("timingName")) {
2043 var end
= new Date();
2045 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2050 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
, clearSelection
) {
2051 this.plotter_
.clear();
2052 this.plotter_
.render();
2053 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2054 this.canvas_
.height
);
2056 // Generate a static legend before any particular point is selected.
2057 this.setLegendHTML_();
2059 if (!is_initial_draw
) {
2060 if (clearSelection
) {
2061 if (typeof(this.selPoints_
) !== 'undefined' && this.selPoints_
.length
) {
2062 // We should select the point nearest the page x/y here
, but it
's easier
2063 // to just clear the selection. This prevents erroneous hover dots from
2065 this.clearSelection();
2067 this.clearSelection();
2072 if (this.rangeSelector_) {
2073 this.rangeSelector_.renderInteractiveLayer();
2076 if (this.attr_("drawCallback") !== null) {
2077 this.attr_("drawCallback")(this, is_initial_draw);
2083 * Determine properties of the y-axes which are independent of the data
2084 * currently being displayed. This includes things like the number of axes and
2085 * the style of the axes. It does not include the range of each axis and its
2087 * This fills in this.axes_ and this.seriesToAxisMap_.
2088 * axes_ = [ { options } ]
2089 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2090 * indices are into the axes_ array.
2092 Dygraph.prototype.computeYAxes_ = function() {
2093 // Preserve valueWindow settings if they exist, and if the user hasn't
2094 // specified a new valueRange.
2095 var i
, valueWindows
, seriesName
, axis
, index
;
2096 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2098 for (index
= 0; index
< this.axes_
.length
; index
++) {
2099 valueWindows
.push(this.axes_
[index
].valueWindow
);
2103 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2104 this.seriesToAxisMap_
= {};
2106 // Get a list of series names.
2107 var labels
= this.attr_("labels");
2109 for (i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2111 // all options which could be applied per-axis:
2119 'axisLabelFontSize',
2124 // Copy global axis options over to the first axis.
2125 for (i
= 0; i
< axisOptions
.length
; i
++) {
2126 var k
= axisOptions
[i
];
2127 var v
= this.attr_(k
);
2128 if (v
) this.axes_
[0][k
] = v
;
2131 // Go through once and add all the axes.
2132 for (seriesName
in series
) {
2133 if (!series
.hasOwnProperty(seriesName
)) continue;
2134 axis
= this.attr_("axis", seriesName
);
2135 if (axis
=== null) {
2136 this.seriesToAxisMap_
[seriesName
] = 0;
2139 if (typeof(axis
) == 'object') {
2140 // Add a new axis, making a copy of its per-axis options.
2142 Dygraph
.update(opts
, this.axes_
[0]);
2143 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2144 var yAxisId
= this.axes_
.length
;
2145 opts
.yAxisId
= yAxisId
;
2147 Dygraph
.update(opts
, axis
);
2148 this.axes_
.push(opts
);
2149 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2153 // Go through one more time and assign series to an axis defined by another
2154 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2155 for (seriesName
in series
) {
2156 if (!series
.hasOwnProperty(seriesName
)) continue;
2157 axis
= this.attr_("axis", seriesName
);
2158 if (typeof(axis
) == 'string') {
2159 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2160 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2161 "series " + axis
+ ", which does not define its own axis.");
2164 var idx
= this.seriesToAxisMap_
[axis
];
2165 this.seriesToAxisMap_
[seriesName
] = idx
;
2169 if (valueWindows
!== undefined
) {
2170 // Restore valueWindow settings.
2171 for (index
= 0; index
< valueWindows
.length
; index
++) {
2172 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2178 * Returns the number of y-axes on the chart.
2179 * @return {Number} the number of axes.
2181 Dygraph
.prototype.numAxes
= function() {
2183 for (var series
in this.seriesToAxisMap_
) {
2184 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2185 var idx
= this.seriesToAxisMap_
[series
];
2186 if (idx
> last_axis
) last_axis
= idx
;
2188 return 1 + last_axis
;
2193 * Returns axis properties for the given series.
2194 * @param { String } setName The name of the series for which to get axis
2195 * properties, e.g. 'Y1'.
2196 * @return { Object } The axis properties.
2198 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2199 // TODO(danvk): handle errors.
2200 return this.axes_
[this.seriesToAxisMap_
[series
]];
2205 * Determine the value range and tick marks for each axis.
2206 * @param {Object} extremes A mapping from seriesName -> [low, high]
2207 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2209 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2210 // Build a map from axis number -> [list of series names]
2211 var seriesForAxis
= [], series
;
2212 for (series
in this.seriesToAxisMap_
) {
2213 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2214 var idx
= this.seriesToAxisMap_
[series
];
2215 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2216 seriesForAxis
[idx
].push(series
);
2219 // Compute extreme values, a span and tick marks for each axis.
2220 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2221 var axis
= this.axes_
[i
];
2223 if (!seriesForAxis
[i
]) {
2224 // If no series are defined or visible then use a reasonable default
2225 axis
.extremeRange
= [0, 1];
2227 // Calculate the extremes of extremes.
2228 series
= seriesForAxis
[i
];
2229 var minY
= Infinity
; // extremes[series[0]][0];
2230 var maxY
= -Infinity
; // extremes[series[0]][1];
2231 var extremeMinY
, extremeMaxY
;
2233 for (var j
= 0; j
< series
.length
; j
++) {
2234 // this skips invisible series
2235 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2237 // Only use valid extremes to stop null data series' from corrupting the scale.
2238 extremeMinY
= extremes
[series
[j
]][0];
2239 if (extremeMinY
!== null) {
2240 minY
= Math
.min(extremeMinY
, minY
);
2242 extremeMaxY
= extremes
[series
[j
]][1];
2243 if (extremeMaxY
!== null) {
2244 maxY
= Math
.max(extremeMaxY
, maxY
);
2247 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2249 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2250 if (minY
== Infinity
) minY
= 0;
2251 if (maxY
== -Infinity
) maxY
= 1;
2253 // Add some padding and round up to an integer to be human-friendly.
2254 var span
= maxY
- minY
;
2255 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2256 if (span
=== 0) { span
= maxY
; }
2258 var maxAxisY
, minAxisY
;
2259 if (axis
.logscale
) {
2260 maxAxisY
= maxY
+ 0.1 * span
;
2263 maxAxisY
= maxY
+ 0.1 * span
;
2264 minAxisY
= minY
- 0.1 * span
;
2266 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2267 if (!this.attr_("avoidMinZero")) {
2268 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2269 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2272 if (this.attr_("includeZero")) {
2273 if (maxY
< 0) maxAxisY
= 0;
2274 if (minY
> 0) minAxisY
= 0;
2277 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2279 if (axis
.valueWindow
) {
2280 // This is only set if the user has zoomed on the y-axis. It is never set
2281 // by a user. It takes precedence over axis.valueRange because, if you set
2282 // valueRange, you'd still expect to be able to pan.
2283 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2284 } else if (axis
.valueRange
) {
2285 // This is a user-set value range for this axis.
2286 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2288 axis
.computedValueRange
= axis
.extremeRange
;
2291 // Add ticks. By default, all axes inherit the tick positions of the
2292 // primary axis. However, if an axis is specifically marked as having
2293 // independent ticks, then that is permissible as well.
2294 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2295 var ticker
= opts('ticker');
2296 if (i
=== 0 || axis
.independentTicks
) {
2297 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2298 axis
.computedValueRange
[1],
2299 this.height_
, // TODO(danvk): should be area.height
2303 var p_axis
= this.axes_
[0];
2304 var p_ticks
= p_axis
.ticks
;
2305 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2306 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2307 var tick_values
= [];
2308 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2309 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2310 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2311 tick_values
.push(y_val
);
2314 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2315 axis
.computedValueRange
[1],
2316 this.height_
, // TODO(danvk): should be area.height
2325 * Extracts one series from the raw data (a 2D array) into an array of (date,
2328 * This is where undesirable points (i.e. negative values on log scales and
2329 * missing values through which we wish to connect lines) are dropped.
2333 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
, connectSeparatedPoints
) {
2335 for (var j
= 0; j
< rawData
.length
; j
++) {
2336 var x
= rawData
[j
][0];
2337 var point
= rawData
[j
][i
];
2339 // On the log scale, points less than zero do not exist.
2340 // This will create a gap in the chart. Note that this ignores
2341 // connectSeparatedPoints.
2345 series
.push([x
, point
]);
2347 if (point
!== null || !connectSeparatedPoints
) {
2348 series
.push([x
, point
]);
2357 * Calculates the rolling average of a data set.
2358 * If originalData is [label, val], rolls the average of those.
2359 * If originalData is [label, [, it's interpreted as [value, stddev]
2360 * and the roll is returned in the same form, with appropriately reduced
2361 * stddev for each value.
2362 * Note that this is where fractional input (i.e. '5/10') is converted into
2364 * @param {Array} originalData The data in the appropriate format (see above)
2365 * @param {Number} rollPeriod The number of points over which to average the
2368 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2369 if (originalData
.length
< 2)
2370 return originalData
;
2371 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2372 var rollingData
= [];
2373 var sigma
= this.attr_("sigma");
2375 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2376 if (this.fractions_
) {
2378 var den
= 0; // numerator/denominator
2380 for (i
= 0; i
< originalData
.length
; i
++) {
2381 num
+= originalData
[i
][1][0];
2382 den
+= originalData
[i
][1][1];
2383 if (i
- rollPeriod
>= 0) {
2384 num
-= originalData
[i
- rollPeriod
][1][0];
2385 den
-= originalData
[i
- rollPeriod
][1][1];
2388 var date
= originalData
[i
][0];
2389 var value
= den
? num
/ den
: 0.0;
2390 if (this.attr_("errorBars")) {
2391 if (this.attr_("wilsonInterval")) {
2392 // For more details on this confidence interval, see:
2393 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2395 var p
= value
< 0 ? 0 : value
, n
= den
;
2396 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2397 var denom
= 1 + sigma
* sigma
/ den
;
2398 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2399 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2400 rollingData
[i
] = [date
,
2401 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2403 rollingData
[i
] = [date
, [0, 0, 0]];
2406 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2407 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2410 rollingData
[i
] = [date
, mult
* value
];
2413 } else if (this.attr_("customBars")) {
2418 for (i
= 0; i
< originalData
.length
; i
++) {
2419 var data
= originalData
[i
][1];
2421 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2423 if (y
!== null && !isNaN(y
)) {
2429 if (i
- rollPeriod
>= 0) {
2430 var prev
= originalData
[i
- rollPeriod
];
2431 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2439 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2440 1.0 * (mid
- low
) / count
,
2441 1.0 * (high
- mid
) / count
]];
2443 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2447 // Calculate the rolling average for the first rollPeriod - 1 points where
2448 // there is not enough data to roll over the full number of points
2449 if (!this.attr_("errorBars")){
2450 if (rollPeriod
== 1) {
2451 return originalData
;
2454 for (i
= 0; i
< originalData
.length
; i
++) {
2457 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2458 y
= originalData
[j
][1];
2459 if (y
=== null || isNaN(y
)) continue;
2461 sum
+= originalData
[j
][1];
2464 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2466 rollingData
[i
] = [originalData
[i
][0], null];
2471 for (i
= 0; i
< originalData
.length
; i
++) {
2475 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2476 y
= originalData
[j
][1][0];
2477 if (y
=== null || isNaN(y
)) continue;
2479 sum
+= originalData
[j
][1][0];
2480 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2483 stddev
= Math
.sqrt(variance
) / num_ok
;
2484 rollingData
[i
] = [originalData
[i
][0],
2485 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2487 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2497 * Detects the type of the str (date or numeric) and sets the various
2498 * formatting attributes in this.attrs_ based on this type.
2499 * @param {String} str An x value.
2502 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2504 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2505 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2506 str
.indexOf('/') >= 0 ||
2507 isNaN(parseFloat(str
))) {
2509 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2510 // TODO(danvk): remove support for this format.
2515 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2516 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2517 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2518 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2520 /** @private (shut up, jsdoc!) */
2521 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2522 // TODO(danvk): use Dygraph.numberValueFormatter here?
2523 /** @private (shut up, jsdoc!) */
2524 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2525 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2526 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2531 * Parses the value as a floating point number. This is like the parseFloat()
2532 * built-in, but with a few differences:
2533 * - the empty string is parsed as null, rather than NaN.
2534 * - if the string cannot be parsed at all, an error is logged.
2535 * If the string can't be parsed, this method returns null.
2536 * @param {String} x The string to be parsed
2537 * @param {Number} opt_line_no The line number from which the string comes.
2538 * @param {String} opt_line The text of the line from which the string comes.
2542 // Parse the x as a float or return null if it's not a number.
2543 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2544 var val
= parseFloat(x
);
2545 if (!isNaN(val
)) return val
;
2547 // Try to figure out what happeend.
2548 // If the value is the empty string, parse it as null.
2549 if (/^ *$/.test(x
)) return null;
2551 // If it was actually "NaN", return it as NaN.
2552 if (/^ *nan *$/i.test(x
)) return NaN
;
2554 // Looks like a parsing error.
2555 var msg
= "Unable to parse '" + x
+ "' as a number";
2556 if (opt_line
!== null && opt_line_no
!== null) {
2557 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2566 * Parses a string in a special csv format. We expect a csv file where each
2567 * line is a date point, and the first field in each line is the date string.
2568 * We also expect that all remaining fields represent series.
2569 * if the errorBars attribute is set, then interpret the fields as:
2570 * date, series1, stddev1, series2, stddev2, ...
2571 * @param {[Object]} data See above.
2573 * @return [Object] An array with one entry for each row. These entries
2574 * are an array of cells in that row. The first entry is the parsed x-value for
2575 * the row. The second, third, etc. are the y-values. These can take on one of
2576 * three forms, depending on the CSV and constructor parameters:
2578 * 2. [ value, stddev ]
2579 * 3. [ low value, center value, high value ]
2581 Dygraph
.prototype.parseCSV_
= function(data
) {
2583 var lines
= data
.split("\n");
2586 // Use the default delimiter or fall back to a tab if that makes sense.
2587 var delim
= this.attr_('delimiter');
2588 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2593 if (!('labels' in this.user_attrs_
)) {
2594 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2596 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2601 var defaultParserSet
= false; // attempt to auto-detect x value type
2602 var expectedCols
= this.attr_("labels").length
;
2603 var outOfOrder
= false;
2604 for (var i
= start
; i
< lines
.length
; i
++) {
2605 var line
= lines
[i
];
2607 if (line
.length
=== 0) continue; // skip blank lines
2608 if (line
[0] == '#') continue; // skip comment lines
2609 var inFields
= line
.split(delim
);
2610 if (inFields
.length
< 2) continue;
2613 if (!defaultParserSet
) {
2614 this.detectTypeFromString_(inFields
[0]);
2615 xParser
= this.attr_("xValueParser");
2616 defaultParserSet
= true;
2618 fields
[0] = xParser(inFields
[0], this);
2620 // If fractions are expected, parse the numbers as "A/B
"
2621 if (this.fractions_) {
2622 for (j = 1; j < inFields.length; j++) {
2623 // TODO(danvk): figure out an appropriate way to flag parse errors.
2624 vals = inFields[j].split("/");
2625 if (vals.length != 2) {
2626 this.error('Expected fractional "num
/den
" values in CSV data ' +
2627 "but found a value
'" + inFields[j] + "' on line
" +
2628 (1 + i) + " ('" + line + "') which is not of
this form
.");
2631 fields[j] = [this.parseFloat_(vals[0], i, line),
2632 this.parseFloat_(vals[1], i, line)];
2635 } else if (this.attr_("errorBars
")) {
2636 // If there are error bars, values are (value, stddev) pairs
2637 if (inFields.length % 2 != 1) {
2638 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2639 'but line ' + (1 + i) + ' has an odd number of values (' +
2640 (inFields.length - 1) + "): '" + line + "'");
2642 for (j = 1; j < inFields.length; j += 2) {
2643 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2644 this.parseFloat_(inFields[j + 1], i, line)];
2646 } else if (this.attr_("customBars
")) {
2647 // Bars are a low;center;high tuple
2648 for (j = 1; j < inFields.length; j++) {
2649 var val = inFields[j];
2650 if (/^ *$/.test(val)) {
2651 fields[j] = [null, null, null];
2653 vals = val.split(";");
2654 if (vals.length == 3) {
2655 fields[j] = [ this.parseFloat_(vals[0], i, line),
2656 this.parseFloat_(vals[1], i, line),
2657 this.parseFloat_(vals[2], i, line) ];
2659 this.warn('When using customBars, values must be either blank ' +
2660 'or "low
;center
;high
" tuples (got "' + val +
2661 '" on line ' + (1+i));
2666 // Values are just numbers
2667 for (j = 1; j < inFields.length; j++) {
2668 fields[j] = this.parseFloat_(inFields[j], i, line);
2671 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2675 if (fields.length != expectedCols) {
2676 this.error("Number of columns
in line
" + i + " (" + fields.length +
2677 ") does not agree
with number of
labels (" + expectedCols +
2681 // If the user specified the 'labels' option and none of the cells of the
2682 // first row parsed correctly, then they probably double-specified the
2683 // labels. We go with the values set in the option, discard this row and
2684 // log a warning to the JS console.
2685 if (i === 0 && this.attr_('labels')) {
2686 var all_null = true;
2687 for (j = 0; all_null && j < fields.length; j++) {
2688 if (fields[j]) all_null = false;
2691 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2692 "CSV
data ('" + line + "') appears to also contain labels
. " +
2693 "Will drop the CSV labels and
use the option labels
.");
2701 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2702 ret.sort(function(a,b) { return a[0] - b[0]; });
2710 * The user has provided their data as a pre-packaged JS array. If the x values
2711 * are numeric, this is the same as dygraphs' internal format. If the x values
2712 * are dates, we need to convert them from Date objects to ms since epoch.
2713 * @param {[Object]} data
2714 * @return {[Object]} data with numeric x values.
2716 Dygraph.prototype.parseArray_ = function(data) {
2717 // Peek at the first x value to see if it's numeric.
2718 if (data.length === 0) {
2719 this.error("Can
't plot empty data set");
2722 if (data[0].length === 0) {
2723 this.error("Data set cannot contain an empty row");
2728 if (this.attr_("labels") === null) {
2729 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2730 "in the options parameter");
2731 this.attrs_.labels = [ "X" ];
2732 for (i = 1; i < data[0].length; i++) {
2733 this.attrs_.labels.push("Y" + i);
2737 if (Dygraph.isDateLike(data[0][0])) {
2738 // Some intelligent defaults for a date x-axis.
2739 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
2740 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
2741 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
2743 // Assume they're all dates
.
2744 var parsedData
= Dygraph
.clone(data
);
2745 for (i
= 0; i
< data
.length
; i
++) {
2746 if (parsedData
[i
].length
=== 0) {
2747 this.error("Row " + (1 + i
) + " of data is empty");
2750 if (parsedData
[i
][0] === null ||
2751 typeof(parsedData
[i
][0].getTime
) != 'function' ||
2752 isNaN(parsedData
[i
][0].getTime())) {
2753 this.error("x value in row " + (1 + i
) + " is not a Date");
2756 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2760 // Some intelligent defaults for a numeric x-axis.
2761 /** @private (shut up, jsdoc!) */
2762 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2763 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
2764 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2770 * Parses a DataTable object from gviz.
2771 * The data is expected to have a first column that is either a date or a
2772 * number. All subsequent columns must be numbers. If there is a clear mismatch
2773 * between this.xValueParser_ and the type of the first column, it will be
2774 * fixed. Fills out rawData_.
2775 * @param {[Object]} data See above.
2778 Dygraph
.prototype.parseDataTable_
= function(data
) {
2779 var cols
= data
.getNumberOfColumns();
2780 var rows
= data
.getNumberOfRows();
2782 var indepType
= data
.getColumnType(0);
2783 if (indepType
== 'date' || indepType
== 'datetime') {
2784 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2785 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2786 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2787 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2788 } else if (indepType
== 'number') {
2789 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2790 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2791 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2792 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2794 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2795 "column 1 of DataTable input (Got '" + indepType
+ "')");
2799 // Array of the column indices which contain data (and not annotations).
2801 var annotationCols
= {}; // data index -> [annotation cols]
2802 var hasAnnotations
= false;
2804 for (i
= 1; i
< cols
; i
++) {
2805 var type
= data
.getColumnType(i
);
2806 if (type
== 'number') {
2808 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2809 // This is OK -- it's an annotation column.
2810 var dataIdx
= colIdx
[colIdx
.length
- 1];
2811 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2812 annotationCols
[dataIdx
] = [i
];
2814 annotationCols
[dataIdx
].push(i
);
2816 hasAnnotations
= true;
2818 this.error("Only 'number' is supported as a dependent type with Gviz." +
2819 " 'string' is only supported if displayAnnotations is true");
2823 // Read column labels
2824 // TODO(danvk): add support back for errorBars
2825 var labels
= [data
.getColumnLabel(0)];
2826 for (i
= 0; i
< colIdx
.length
; i
++) {
2827 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2828 if (this.attr_("errorBars")) i
+= 1;
2830 this.attrs_
.labels
= labels
;
2831 cols
= labels
.length
;
2834 var outOfOrder
= false;
2835 var annotations
= [];
2836 for (i
= 0; i
< rows
; i
++) {
2838 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2839 data
.getValue(i
, 0) === null) {
2840 this.warn("Ignoring row " + i
+
2841 " of DataTable because of undefined or null first column.");
2845 if (indepType
== 'date' || indepType
== 'datetime') {
2846 row
.push(data
.getValue(i
, 0).getTime());
2848 row
.push(data
.getValue(i
, 0));
2850 if (!this.attr_("errorBars")) {
2851 for (j
= 0; j
< colIdx
.length
; j
++) {
2852 var col
= colIdx
[j
];
2853 row
.push(data
.getValue(i
, col
));
2854 if (hasAnnotations
&&
2855 annotationCols
.hasOwnProperty(col
) &&
2856 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
2858 ann
.series
= data
.getColumnLabel(col
);
2860 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
);
2862 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2863 if (k
) ann
.text
+= "\n";
2864 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2866 annotations
.push(ann
);
2870 // Strip out infinities, which give dygraphs problems later on.
2871 for (j
= 0; j
< row
.length
; j
++) {
2872 if (!isFinite(row
[j
])) row
[j
] = null;
2875 for (j
= 0; j
< cols
- 1; j
++) {
2876 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2879 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2886 this.warn("DataTable is out of order; order it correctly to speed loading.");
2887 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
2889 this.rawData_
= ret
;
2891 if (annotations
.length
> 0) {
2892 this.setAnnotations(annotations
, true);
2897 * Get the CSV data. If it's in a function, call that function. If it's in a
2898 * file, do an XMLHttpRequest to get it.
2901 Dygraph
.prototype.start_
= function() {
2902 var data
= this.file_
;
2904 // Functions can return references of all other types.
2905 if (typeof data
== 'function') {
2909 if (Dygraph
.isArrayLike(data
)) {
2910 this.rawData_
= this.parseArray_(data
);
2912 } else if (typeof data
== 'object' &&
2913 typeof data
.getColumnRange
== 'function') {
2914 // must be a DataTable from gviz.
2915 this.parseDataTable_(data
);
2917 } else if (typeof data
== 'string') {
2918 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2919 if (data
.indexOf('\n') >= 0) {
2920 this.loadedEvent_(data
);
2922 var req
= new XMLHttpRequest();
2924 req
.onreadystatechange
= function () {
2925 if (req
.readyState
== 4) {
2926 if (req
.status
=== 200 || // Normal http
2927 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
2928 caller
.loadedEvent_(req
.responseText
);
2933 req
.open("GET", data
, true);
2937 this.error("Unknown data format: " + (typeof data
));
2942 * Changes various properties of the graph. These can include:
2944 * <li>file: changes the source data for the graph</li>
2945 * <li>errorBars: changes whether the data contains stddev</li>
2948 * There's a huge variety of options that can be passed to this method. For a
2949 * full list, see http://dygraphs.com/options.html.
2951 * @param {Object} attrs The new properties and values
2952 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
2953 * call to updateOptions(). If you know better, you can pass true to explicitly
2954 * block the redraw. This can be useful for chaining updateOptions() calls,
2955 * avoiding the occasional infinite loop and preventing redraws when it's not
2956 * necessary (e.g. when updating a callback).
2958 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
2959 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
2961 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
2962 var file
= input_attrs
.file
;
2963 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
2965 // TODO(danvk): this is a mess. Move these options into attr_.
2966 if ('rollPeriod' in attrs
) {
2967 this.rollPeriod_
= attrs
.rollPeriod
;
2969 if ('dateWindow' in attrs
) {
2970 this.dateWindow_
= attrs
.dateWindow
;
2971 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
2972 this.zoomed_x_
= (attrs
.dateWindow
!== null);
2975 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
2976 this.zoomed_y_
= (attrs
.valueRange
!== null);
2979 // TODO(danvk): validate per-series options.
2984 // highlightCircleSize
2986 // Check if this set options will require new points.
2987 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
2989 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
2993 if (!block_redraw
) this.start_();
2995 if (!block_redraw
) {
2996 if (requiresNewPoints
) {
2999 this.renderGraph_(false, false);
3006 * Returns a copy of the options with deprecated names converted into current
3007 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3008 * interested in that, they should save a copy before calling this.
3011 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3013 for (var k
in attrs
) {
3014 if (k
== 'file') continue;
3015 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3018 var set
= function(axis
, opt
, value
) {
3019 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3020 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3021 my_attrs
.axes
[axis
][opt
] = value
;
3023 var map
= function(opt
, axis
, new_opt
) {
3024 if (typeof(attrs
[opt
]) != 'undefined') {
3025 set(axis
, new_opt
, attrs
[opt
]);
3026 delete my_attrs
[opt
];
3030 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3031 map('xValueFormatter', 'x', 'valueFormatter');
3032 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3033 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3034 map('xTicker', 'x', 'ticker');
3035 map('yValueFormatter', 'y', 'valueFormatter');
3036 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3037 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3038 map('yTicker', 'y', 'ticker');
3043 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3044 * containing div (which has presumably changed size since the dygraph was
3045 * instantiated. If the width/height are specified, the div will be resized.
3047 * This is far more efficient than destroying and re-instantiating a
3048 * Dygraph, since it doesn't have to reparse the underlying data.
3050 * @param {Number} [width] Width (in pixels)
3051 * @param {Number} [height] Height (in pixels)
3053 Dygraph
.prototype.resize
= function(width
, height
) {
3054 if (this.resize_lock
) {
3057 this.resize_lock
= true;
3059 if ((width
=== null) != (height
=== null)) {
3060 this.warn("Dygraph.resize() should be called with zero parameters or " +
3061 "two non-NULL parameters. Pretending it was zero.");
3062 width
= height
= null;
3065 var old_width
= this.width_
;
3066 var old_height
= this.height_
;
3069 this.maindiv_
.style
.width
= width
+ "px";
3070 this.maindiv_
.style
.height
= height
+ "px";
3071 this.width_
= width
;
3072 this.height_
= height
;
3074 this.width_
= this.maindiv_
.clientWidth
;
3075 this.height_
= this.maindiv_
.clientHeight
;
3078 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3079 // TODO(danvk): there should be a clear() method.
3080 this.maindiv_
.innerHTML
= "";
3081 this.roller_
= null;
3082 this.attrs_
.labelsDiv
= null;
3083 this.createInterface_();
3084 if (this.annotations_
.length
) {
3085 // createInterface_ reset the layout, so we need to do this.
3086 this.layout_
.setAnnotations(this.annotations_
);
3091 this.resize_lock
= false;
3095 * Adjusts the number of points in the rolling average. Updates the graph to
3096 * reflect the new averaging period.
3097 * @param {Number} length Number of points over which to average the data.
3099 Dygraph
.prototype.adjustRoll
= function(length
) {
3100 this.rollPeriod_
= length
;
3105 * Returns a boolean array of visibility statuses.
3107 Dygraph
.prototype.visibility
= function() {
3108 // Do lazy-initialization, so that this happens after we know the number of
3110 if (!this.attr_("visibility")) {
3111 this.attrs_
.visibility
= [];
3113 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3114 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3115 this.attrs_
.visibility
.push(true);
3117 return this.attr_("visibility");
3121 * Changes the visiblity of a series.
3123 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3124 var x
= this.visibility();
3125 if (num
< 0 || num
>= x
.length
) {
3126 this.warn("invalid series number in setVisibility: " + num
);
3134 * How large of an area will the dygraph render itself in?
3135 * This is used for testing.
3136 * @return A {width: w, height: h} object.
3139 Dygraph
.prototype.size
= function() {
3140 return { width
: this.width_
, height
: this.height_
};
3144 * Update the list of annotations and redraw the chart.
3145 * See dygraphs.com/annotations.html for more info on how to use annotations.
3146 * @param ann {Array} An array of annotation objects.
3147 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3149 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3150 // Only add the annotation CSS rule once we know it will be used.
3151 Dygraph
.addAnnotationRule();
3152 this.annotations_
= ann
;
3153 this.layout_
.setAnnotations(this.annotations_
);
3154 if (!suppressDraw
) {
3160 * Return the list of annotations.
3162 Dygraph
.prototype.annotations
= function() {
3163 return this.annotations_
;
3167 * Get the index of a series (column) given its name. The first column is the
3168 * x-axis, so the data series start with index 1.
3170 Dygraph
.prototype.indexFromSetName
= function(name
) {
3171 var labels
= this.attr_("labels");
3172 for (var i
= 0; i
< labels
.length
; i
++) {
3173 if (labels
[i
] == name
) return i
;
3180 * Adds a default style for the annotation CSS classes to the document. This is
3181 * only executed when annotations are actually used. It is designed to only be
3182 * called once -- all calls after the first will return immediately.
3184 Dygraph
.addAnnotationRule
= function() {
3185 if (Dygraph
.addedAnnotationCSS
) return;
3187 var rule
= "border: 1px solid black; " +
3188 "background-color: white; " +
3189 "text-align: center;";
3191 var styleSheetElement
= document
.createElement("style");
3192 styleSheetElement
.type
= "text/css";
3193 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3195 // Find the first style sheet that we can access.
3196 // We may not add a rule to a style sheet from another domain for security
3197 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3198 // adds its own style sheets from google.com.
3199 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3200 if (document
.styleSheets
[i
].disabled
) continue;
3201 var mysheet
= document
.styleSheets
[i
];
3203 if (mysheet
.insertRule
) { // Firefox
3204 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3205 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3206 } else if (mysheet
.addRule
) { // IE
3207 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3209 Dygraph
.addedAnnotationCSS
= true;
3212 // Was likely a security exception.
3216 this.warn("Unable to add default annotation CSS rule; display may be off.");
3219 // Older pages may still use this name.
3220 var DateGraph
= Dygraph
;