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 this.resizeHandler
= function(e
) {
847 // Update when the window is resized.
848 // TODO(danvk): drop frames depending on complexity of the chart.
849 Dygraph
.addEvent(window
, 'resize', this.resizeHandler
);
853 * Detach DOM elements in the dygraph and null out all data references.
854 * Calling this when you're done with a dygraph can dramatically reduce memory
855 * usage. See, e.g., the tests/perf.html example.
857 Dygraph
.prototype.destroy
= function() {
858 var removeRecursive
= function(node
) {
859 while (node
.hasChildNodes()) {
860 removeRecursive(node
.firstChild
);
861 node
.removeChild(node
.firstChild
);
864 removeRecursive(this.maindiv_
);
866 var nullOut
= function(obj
) {
868 if (typeof(obj
[n
]) === 'object') {
873 // remove event handlers
874 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
875 this.resizeHandler
= null;
876 // These may not all be necessary, but it can't hurt...
877 nullOut(this.layout_
);
878 nullOut(this.plotter_
);
883 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
884 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
885 * or the zoom rectangles) is done on this.canvas_.
886 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
887 * @return {Object} The newly-created canvas
890 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
891 var h
= Dygraph
.createCanvas();
892 h
.style
.position
= "absolute";
893 // TODO(danvk): h should be offset from canvas. canvas needs to include
894 // some extra area to make it easier to zoom in on the far left and far
895 // right. h needs to be precisely the plot area, so that clipping occurs.
896 h
.style
.top
= canvas
.style
.top
;
897 h
.style
.left
= canvas
.style
.left
;
898 h
.width
= this.width_
;
899 h
.height
= this.height_
;
900 h
.style
.width
= this.width_
+ "px"; // for IE
901 h
.style
.height
= this.height_
+ "px"; // for IE
906 * Creates an overlay element used to handle mouse events.
907 * @return {Object} The mouse event element.
910 Dygraph
.prototype.createMouseEventElement_
= function() {
911 if (this.isUsingExcanvas_
) {
912 var elem
= document
.createElement("div");
913 elem
.style
.position
= 'absolute';
914 elem
.style
.backgroundColor
= 'white';
915 elem
.style
.filter
= 'alpha(opacity=0)';
916 elem
.style
.width
= this.width_
+ "px";
917 elem
.style
.height
= this.height_
+ "px";
918 this.graphDiv
.appendChild(elem
);
926 * Generate a set of distinct colors for the data series. This is done with a
927 * color wheel. Saturation/Value are customizable, and the hue is
928 * equally-spaced around the color wheel. If a custom set of colors is
929 * specified, that is used instead.
932 Dygraph
.prototype.setColors_
= function() {
933 var num
= this.attr_("labels").length
- 1;
935 var colors
= this.attr_('colors');
938 var sat
= this.attr_('colorSaturation') || 1.0;
939 var val
= this.attr_('colorValue') || 0.5;
940 var half
= Math
.ceil(num
/ 2);
941 for (i
= 1; i
<= num
; i
++) {
942 if (!this.visibility()[i
-1]) continue;
943 // alternate colors for high contrast.
944 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
945 var hue
= (1.0 * idx
/ (1 + num
));
946 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
949 for (i
= 0; i
< num
; i
++) {
950 if (!this.visibility()[i
]) continue;
951 var colorStr
= colors
[i
% colors
.length
];
952 this.colors_
.push(colorStr
);
956 this.plotter_
.setColors(this.colors_
);
960 * Return the list of colors. This is either the list of colors passed in the
961 * attributes or the autogenerated list of rgb(r,g,b) strings.
962 * @return {Array<string>} The list of colors.
964 Dygraph
.prototype.getColors
= function() {
969 * Create the div that contains information on the selected point(s)
970 * This goes in the top right of the canvas, unless an external div has already
974 Dygraph
.prototype.createStatusMessage_
= function() {
975 var userLabelsDiv
= this.user_attrs_
.labelsDiv
;
976 if (userLabelsDiv
&& null !== userLabelsDiv
&&
977 (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
978 this.user_attrs_
.labelsDiv
= document
.getElementById(userLabelsDiv
);
980 if (!this.attr_("labelsDiv")) {
981 var divWidth
= this.attr_('labelsDivWidth');
983 "position": "absolute",
986 "width": divWidth
+ "px",
988 "left": (this.width_
- divWidth
- 2) + "px",
989 "background": "white",
991 "overflow": "hidden"};
992 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
993 var div
= document
.createElement("div");
994 div
.className
= "dygraph-legend";
995 for (var name
in messagestyle
) {
996 if (messagestyle
.hasOwnProperty(name
)) {
997 div
.style
[name
] = messagestyle
[name
];
1000 this.graphDiv
.appendChild(div
);
1001 this.attrs_
.labelsDiv
= div
;
1006 * Position the labels div so that:
1007 * - its right edge is flush with the right edge of the charting area
1008 * - its top edge is flush with the top edge of the charting area
1011 Dygraph
.prototype.positionLabelsDiv_
= function() {
1012 // Don't touch a user-specified labelsDiv.
1013 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
1015 var area
= this.plotter_
.area
;
1016 var div
= this.attr_("labelsDiv");
1017 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
1018 div
.style
.top
= area
.y
+ "px";
1022 * Create the text box to adjust the averaging period
1025 Dygraph
.prototype.createRollInterface_
= function() {
1026 // Create a roller if one doesn't exist already.
1027 if (!this.roller_
) {
1028 this.roller_
= document
.createElement("input");
1029 this.roller_
.type
= "text";
1030 this.roller_
.style
.display
= "none";
1031 this.graphDiv
.appendChild(this.roller_
);
1034 var display
= this.attr_('showRoller') ? 'block' : 'none';
1036 var area
= this.plotter_
.area
;
1037 var textAttr
= { "position": "absolute",
1039 "top": (area
.y
+ area
.h
- 25) + "px",
1040 "left": (area
.x
+ 1) + "px",
1043 this.roller_
.size
= "2";
1044 this.roller_
.value
= this.rollPeriod_
;
1045 for (var name
in textAttr
) {
1046 if (textAttr
.hasOwnProperty(name
)) {
1047 this.roller_
.style
[name
] = textAttr
[name
];
1052 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1057 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1058 * canvas (i.e. DOM Coords).
1060 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1061 return Dygraph
.pageX(e
) - context
.px
;
1066 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1067 * canvas (i.e. DOM Coords).
1069 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1070 return Dygraph
.pageY(e
) - context
.py
;
1074 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1078 Dygraph
.prototype.createDragInterface_
= function() {
1080 // Tracks whether the mouse is down right now
1082 isPanning
: false, // is this drag part of a pan?
1083 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1084 dragStartX
: null, // pixel coordinates
1085 dragStartY
: null, // pixel coordinates
1086 dragEndX
: null, // pixel coordinates
1087 dragEndY
: null, // pixel coordinates
1088 dragDirection
: null,
1089 prevEndX
: null, // pixel coordinates
1090 prevEndY
: null, // pixel coordinates
1091 prevDragDirection
: null,
1093 // The value on the left side of the graph when a pan operation starts.
1094 initialLeftmostDate
: null,
1096 // The number of units each pixel spans. (This won't be valid for log
1098 xUnitsPerPixel
: null,
1100 // TODO(danvk): update this comment
1101 // The range in second/value units that the viewport encompasses during a
1102 // panning operation.
1105 // Top-left corner of the canvas, in DOM coords
1106 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1110 // Values for use with panEdgeFraction, which limit how far outside the
1111 // graph's data boundaries it can be panned.
1112 boundedDates
: null, // [minDate, maxDate]
1113 boundedValues
: null, // [[minValue, maxValue] ...]
1115 initializeMouseDown
: function(event
, g
, context
) {
1116 // prevents mouse drags from selecting page text.
1117 if (event
.preventDefault
) {
1118 event
.preventDefault(); // Firefox, Chrome, etc.
1120 event
.returnValue
= false; // IE
1121 event
.cancelBubble
= true;
1124 context
.px
= Dygraph
.findPosX(g
.canvas_
);
1125 context
.py
= Dygraph
.findPosY(g
.canvas_
);
1126 context
.dragStartX
= g
.dragGetX_(event
, context
);
1127 context
.dragStartY
= g
.dragGetY_(event
, context
);
1131 var interactionModel
= this.attr_("interactionModel");
1133 // Self is the graph.
1136 // Function that binds the graph and context to the handler.
1137 var bindHandler
= function(handler
) {
1138 return function(event
) {
1139 handler(event
, self
, context
);
1143 for (var eventName
in interactionModel
) {
1144 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1145 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
1146 bindHandler(interactionModel
[eventName
]));
1149 // If the user releases the mouse button during a drag, but not over the
1150 // canvas, then it doesn't count as a zooming action.
1151 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
1152 if (context
.isZooming
|| context
.isPanning
) {
1153 context
.isZooming
= false;
1154 context
.dragStartX
= null;
1155 context
.dragStartY
= null;
1158 if (context
.isPanning
) {
1159 context
.isPanning
= false;
1160 context
.draggingDate
= null;
1161 context
.dateRange
= null;
1162 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1163 delete self
.axes_
[i
].draggingValue
;
1164 delete self
.axes_
[i
].dragValueRange
;
1171 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1172 * up any previous zoom rectangles that were drawn. This could be optimized to
1173 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1176 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1177 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1178 * @param {Number} startX The X position where the drag started, in canvas
1180 * @param {Number} endX The current X position of the drag, in canvas coords.
1181 * @param {Number} startY The Y position where the drag started, in canvas
1183 * @param {Number} endY The current Y position of the drag, in canvas coords.
1184 * @param {Number} prevDirection the value of direction on the previous call to
1185 * this function. Used to avoid excess redrawing
1186 * @param {Number} prevEndX The value of endX on the previous call to this
1187 * function. Used to avoid excess redrawing
1188 * @param {Number} prevEndY The value of endY on the previous call to this
1189 * function. Used to avoid excess redrawing
1192 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1193 endY
, prevDirection
, prevEndX
,
1195 var ctx
= this.canvas_ctx_
;
1197 // Clean up from the previous rect if necessary
1198 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1199 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1200 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1201 } else if (prevDirection
== Dygraph
.VERTICAL
){
1202 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1203 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1206 // Draw a light-grey rectangle to show the new viewing area
1207 if (direction
== Dygraph
.HORIZONTAL
) {
1208 if (endX
&& startX
) {
1209 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1210 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1211 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1213 } else if (direction
== Dygraph
.VERTICAL
) {
1214 if (endY
&& startY
) {
1215 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1216 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1217 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1221 if (this.isUsingExcanvas_
) {
1222 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1227 * Clear the zoom rectangle (and perform no zoom).
1230 Dygraph
.prototype.clearZoomRect_
= function() {
1231 this.currentZoomRectArgs_
= null;
1232 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1236 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1237 * the canvas. The exact zoom window may be slightly larger if there are no data
1238 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1239 * which accepts dates that match the raw data. This function redraws the graph.
1241 * @param {Number} lowX The leftmost pixel value that should be visible.
1242 * @param {Number} highX The rightmost pixel value that should be visible.
1245 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1246 this.currentZoomRectArgs_
= null;
1247 // Find the earliest and latest dates contained in this canvasx range.
1248 // Convert the call to date ranges of the raw data.
1249 var minDate
= this.toDataXCoord(lowX
);
1250 var maxDate
= this.toDataXCoord(highX
);
1251 this.doZoomXDates_(minDate
, maxDate
);
1255 * Transition function to use in animations. Returns values between 0.0
1256 * (totally old values) and 1.0 (totally new values) for each frame.
1259 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1261 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1265 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1266 * method with doZoomX which accepts pixel coordinates. This function redraws
1269 * @param {Number} minDate The minimum date that should be visible.
1270 * @param {Number} maxDate The maximum date that should be visible.
1273 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1274 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1275 // can produce strange effects. Rather than the y-axis transitioning slowly
1276 // between values, it can jerk around.)
1277 var old_window
= this.xAxisRange();
1278 var new_window
= [minDate
, maxDate
];
1279 this.zoomed_x_
= true;
1281 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1282 if (that
.attr_("zoomCallback")) {
1283 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1289 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1290 * the canvas. This function redraws the graph.
1292 * @param {Number} lowY The topmost pixel value that should be visible.
1293 * @param {Number} highY The lowest pixel value that should be visible.
1296 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1297 this.currentZoomRectArgs_
= null;
1298 // Find the highest and lowest values in pixel range for each axis.
1299 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1300 // This is because pixels increase as you go down on the screen, whereas data
1301 // coordinates increase as you go up the screen.
1302 var oldValueRanges
= this.yAxisRanges();
1303 var newValueRanges
= [];
1304 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1305 var hi
= this.toDataYCoord(lowY
, i
);
1306 var low
= this.toDataYCoord(highY
, i
);
1307 newValueRanges
.push([low
, hi
]);
1310 this.zoomed_y_
= true;
1312 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1313 if (that
.attr_("zoomCallback")) {
1314 var xRange
= that
.xAxisRange();
1315 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1321 * Reset the zoom to the original view coordinates. This is the same as
1322 * double-clicking on the graph.
1326 Dygraph
.prototype.doUnzoom_
= function() {
1327 var dirty
= false, dirtyX
= false, dirtyY
= false;
1328 if (this.dateWindow_
!== null) {
1333 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1334 if (this.axes_
[i
].valueWindow
!== null) {
1340 // Clear any selection, since it's likely to be drawn in the wrong place.
1341 this.clearSelection();
1344 this.zoomed_x_
= false;
1345 this.zoomed_y_
= false;
1347 var minDate
= this.rawData_
[0][0];
1348 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1350 // With only one frame, don't bother calculating extreme ranges.
1351 // TODO(danvk): merge this block w/ the code below
.
1352 if (!this.attr_("animatedZooms")) {
1353 this.dateWindow_
= null;
1354 for (i
= 0; i
< this.axes_
.length
; i
++) {
1355 if (this.axes_
[i
].valueWindow
!== null) {
1356 delete this.axes_
[i
].valueWindow
;
1360 if (this.attr_("zoomCallback")) {
1361 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1366 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1368 oldWindow
= this.xAxisRange();
1369 newWindow
= [minDate
, maxDate
];
1373 oldValueRanges
= this.yAxisRanges();
1374 // TODO(danvk): this is pretty inefficient
1375 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1376 var extremes
= packed
[1];
1378 // this has the side-effect of modifying this.axes_.
1379 // this doesn't make much sense in this context, but it's convenient (we
1380 // need this.axes_[*].extremeValues) and not harmful since we'll be
1381 // calling drawGraph_ shortly, which clobbers these values.
1382 this.computeYAxisRanges_(extremes
);
1384 newValueRanges
= [];
1385 for (i
= 0; i
< this.axes_
.length
; i
++) {
1386 newValueRanges
.push(this.axes_
[i
].extremeRange
);
1391 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1393 that
.dateWindow_
= null;
1394 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1395 if (that
.axes_
[i
].valueWindow
!== null) {
1396 delete that
.axes_
[i
].valueWindow
;
1399 if (that
.attr_("zoomCallback")) {
1400 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1407 * Combined animation logic for all zoom functions.
1408 * either the x parameters or y parameters may be null.
1411 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1412 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1415 var valueRanges
= [];
1418 if (oldXRange
!== null && newXRange
!== null) {
1419 for (step
= 1; step
<= steps
; step
++) {
1420 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1421 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1422 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1426 if (oldYRanges
!== null && newYRanges
!== null) {
1427 for (step
= 1; step
<= steps
; step
++) {
1428 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1430 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1431 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1432 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1434 valueRanges
[step
-1] = thisRange
;
1439 Dygraph
.repeatAndCleanup(function(step
) {
1440 if (valueRanges
.length
) {
1441 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1442 var w
= valueRanges
[step
][i
];
1443 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1446 if (windows
.length
) {
1447 that
.dateWindow_
= windows
[step
];
1450 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1454 * When the mouse moves in the canvas, display information about a nearby data
1455 * point and draw dots over those points in the data series. This function
1456 * takes care of cleanup of previously-drawn dots.
1457 * @param {Object} event The mousemove event from the browser.
1460 Dygraph
.prototype.mouseMove_
= function(event
) {
1461 // This prevents JS errors when mousing over the canvas before data loads.
1462 var points
= this.layout_
.points
;
1463 if (points
=== undefined
) return;
1465 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1470 // Loop through all the points and find the date nearest to our current
1472 var minDist
= 1e+100;
1474 for (i
= 0; i
< points
.length
; i
++) {
1475 var point
= points
[i
];
1476 if (point
=== null) continue;
1477 var dist
= Math
.abs(point
.canvasx
- canvasx
);
1478 if (dist
> minDist
) continue;
1482 if (idx
>= 0) lastx
= points
[idx
].xval
;
1484 // Extract the points we've selected
1485 this.selPoints_
= [];
1486 var l
= points
.length
;
1487 if (!this.attr_("stackedGraph")) {
1488 for (i
= 0; i
< l
; i
++) {
1489 if (points
[i
].xval
== lastx
) {
1490 this.selPoints_
.push(points
[i
]);
1494 // Need to 'unstack' points starting from the bottom
1495 var cumulative_sum
= 0;
1496 for (i
= l
- 1; i
>= 0; i
--) {
1497 if (points
[i
].xval
== lastx
) {
1498 var p
= {}; // Clone the point since we modify it
1499 for (var k
in points
[i
]) {
1500 p
[k
] = points
[i
][k
];
1502 p
.yval
-= cumulative_sum
;
1503 cumulative_sum
+= p
.yval
;
1504 this.selPoints_
.push(p
);
1507 this.selPoints_
.reverse();
1510 if (this.attr_("highlightCallback")) {
1511 var px
= this.lastx_
;
1512 if (px
!== null && lastx
!= px
) {
1513 // only fire if the selected point has changed.
1514 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
, this.idxToRow_(idx
));
1518 // Save last x position for callbacks.
1519 this.lastx_
= lastx
;
1521 this.updateSelection_();
1525 * Transforms layout_.points index into data row number.
1526 * @param int layout_.points index
1527 * @return int row number, or -1 if none could be found.
1530 Dygraph
.prototype.idxToRow_
= function(idx
) {
1531 if (idx
< 0) return -1;
1533 // make sure that you get the boundaryIds record which is also defined (see bug #236)
1534 var boundaryIdx
= -1;
1535 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1536 if (this.boundaryIds_
[i
] !== undefined
) {
1541 if (boundaryIdx
< 0) return -1;
1542 for (var name
in this.layout_
.datasets
) {
1543 if (idx
< this.layout_
.datasets
[name
].length
) {
1544 return this.boundaryIds_
[boundaryIdx
][0] + idx
;
1546 idx
-= this.layout_
.datasets
[name
].length
;
1553 * Generates HTML for the legend which is displayed when hovering over the
1554 * chart. If no selected points are specified, a default legend is returned
1555 * (this may just be the empty string).
1556 * @param { Number } [x] The x-value of the selected points.
1557 * @param { [Object] } [sel_points] List of selected points for the given
1558 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1560 Dygraph
.prototype.generateLegendHTML_
= function(x
, sel_points
) {
1561 // If no points are selected, we display a default legend. Traditionally,
1562 // this has been blank. But a better default would be a conventional legend,
1563 // which provides essential information for a non-interactive chart.
1564 var html
, sepLines
, i
, c
;
1565 if (typeof(x
) === 'undefined') {
1566 if (this.attr_('legend') != 'always') return '';
1568 sepLines
= this.attr_('labelsSeparateLines');
1569 var labels
= this.attr_('labels');
1571 for (i
= 1; i
< labels
.length
; i
++) {
1572 if (!this.visibility()[i
- 1]) continue;
1573 c
= this.plotter_
.colors
[labels
[i
]];
1574 if (html
!== '') html
+= (sepLines
? '<br/>' : ' ');
1575 html
+= "<b><span style='color: " + c
+ ";'>—" + labels
[i
] +
1581 var xOptView
= this.optionsViewForAxis_('x');
1582 var xvf
= xOptView('valueFormatter');
1583 html
= xvf(x
, xOptView
, this.attr_('labels')[0], this) + ":";
1586 var num_axes
= this.numAxes();
1587 for (i
= 0; i
< num_axes
; i
++) {
1588 yOptViews
[i
] = this.optionsViewForAxis_('y' + (i
? 1 + i
: ''));
1590 var showZeros
= this.attr_("labelsShowZeroValues");
1591 sepLines
= this.attr_("labelsSeparateLines");
1592 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1593 var pt
= this.selPoints_
[i
];
1594 if (pt
.yval
=== 0 && !showZeros
) continue;
1595 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1596 if (sepLines
) html
+= "<br/>";
1598 var yOptView
= yOptViews
[this.seriesToAxisMap_
[pt
.name
]];
1599 var fmtFunc
= yOptView('valueFormatter');
1600 c
= this.plotter_
.colors
[pt
.name
];
1601 var yval
= fmtFunc(pt
.yval
, yOptView
, pt
.name
, this);
1603 // TODO(danvk): use a template string here and make it an attribute.
1604 html
+= " <b><span style='color: " + c
+ ";'>" + pt
.name
+
1605 "</span></b>:" + yval
;
1612 * Displays information about the selected points in the legend. If there is no
1613 * selection, the legend will be cleared.
1614 * @param { Number } [x] The x-value of the selected points.
1615 * @param { [Object] } [sel_points] List of selected points for the given
1616 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1618 Dygraph
.prototype.setLegendHTML_
= function(x
, sel_points
) {
1619 var html
= this.generateLegendHTML_(x
, sel_points
);
1620 var labelsDiv
= this.attr_("labelsDiv");
1621 if (labelsDiv
!== null) {
1622 labelsDiv
.innerHTML
= html
;
1624 if (typeof(this.shown_legend_error_
) == 'undefined') {
1625 this.error('labelsDiv is set to something nonexistent; legend will not be shown.');
1626 this.shown_legend_error_
= true;
1632 * Draw dots over the selectied points in the data series. This function
1633 * takes care of cleanup of previously-drawn dots.
1636 Dygraph
.prototype.updateSelection_
= function() {
1637 // Clear the previously drawn vertical, if there is one
1639 var ctx
= this.canvas_ctx_
;
1640 if (this.previousVerticalX_
>= 0) {
1641 // Determine the maximum highlight circle size.
1642 var maxCircleSize
= 0;
1643 var labels
= this.attr_('labels');
1644 for (i
= 1; i
< labels
.length
; i
++) {
1645 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1646 if (r
> maxCircleSize
) maxCircleSize
= r
;
1648 var px
= this.previousVerticalX_
;
1649 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1650 2 * maxCircleSize
+ 2, this.height_
);
1653 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1654 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1657 if (this.selPoints_
.length
> 0) {
1658 // Set the status message to indicate the selected point(s)
1659 if (this.attr_('showLabelsOnHighlight')) {
1660 this.setLegendHTML_(this.lastx_
, this.selPoints_
);
1663 // Draw colored circles over the center of each selected point
1664 var canvasx
= this.selPoints_
[0].canvasx
;
1666 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1667 var pt
= this.selPoints_
[i
];
1668 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1670 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1672 ctx
.fillStyle
= this.plotter_
.colors
[pt
.name
];
1673 ctx
.arc(canvasx
, pt
.canvasy
, circleSize
, 0, 2 * Math
.PI
, false);
1678 this.previousVerticalX_
= canvasx
;
1683 * Manually set the selected points and display information about them in the
1684 * legend. The selection can be cleared using clearSelection() and queried
1685 * using getSelection().
1686 * @param { Integer } row number that should be highlighted (i.e. appear with
1687 * hover dots on the chart). Set to false to clear any selection.
1689 Dygraph
.prototype.setSelection
= function(row
) {
1690 // Extract the points we've selected
1691 this.selPoints_
= [];
1694 if (row
!== false) {
1695 row
= row
- this.boundaryIds_
[0][0];
1698 if (row
!== false && row
>= 0) {
1699 for (var i
in this.layout_
.datasets
) {
1700 if (row
< this.layout_
.datasets
[i
].length
) {
1701 var point
= this.layout_
.points
[pos
+row
];
1703 if (this.attr_("stackedGraph")) {
1704 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1707 this.selPoints_
.push(point
);
1709 pos
+= this.layout_
.datasets
[i
].length
;
1713 if (this.selPoints_
.length
) {
1714 this.lastx_
= this.selPoints_
[0].xval
;
1715 this.updateSelection_();
1717 this.clearSelection();
1723 * The mouse has left the canvas. Clear out whatever artifacts remain
1724 * @param {Object} event the mouseout event from the browser.
1727 Dygraph
.prototype.mouseOut_
= function(event
) {
1728 if (this.attr_("unhighlightCallback")) {
1729 this.attr_("unhighlightCallback")(event
);
1732 if (this.attr_("hideOverlayOnMouseOut")) {
1733 this.clearSelection();
1738 * Clears the current selection (i.e. points that were highlighted by moving
1739 * the mouse over the chart).
1741 Dygraph
.prototype.clearSelection
= function() {
1742 // Get rid of the overlay data
1743 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
1744 this.setLegendHTML_();
1745 this.selPoints_
= [];
1750 * Returns the number of the currently selected row. To get data for this row,
1751 * you can use the getValue method.
1752 * @return { Integer } row number, or -1 if nothing is selected
1754 Dygraph
.prototype.getSelection
= function() {
1755 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1759 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1760 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1761 return row
+ this.boundaryIds_
[0][0];
1768 * Fires when there's data available to be graphed.
1769 * @param {String} data Raw CSV data to be plotted
1772 Dygraph
.prototype.loadedEvent_
= function(data
) {
1773 this.rawData_
= this.parseCSV_(data
);
1778 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1781 Dygraph
.prototype.addXTicks_
= function() {
1782 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1784 if (this.dateWindow_
) {
1785 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
1787 range
= this.fullXRange_();
1790 var xAxisOptionsView
= this.optionsViewForAxis_('x');
1791 var xTicks
= xAxisOptionsView('ticker')(
1794 this.width_
, // TODO(danvk): should be area.width
1797 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
1798 // console.log(msg);
1799 this.layout_
.setXTicks(xTicks
);
1804 * Computes the range of the data series (including confidence intervals).
1805 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
1806 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1807 * @return [low, high]
1809 Dygraph
.prototype.extremeValues_
= function(series
) {
1810 var minY
= null, maxY
= null, j
, y
;
1812 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1814 // With custom bars, maxY is the max of the high values.
1815 for (j
= 0; j
< series
.length
; j
++) {
1816 y
= series
[j
][1][0];
1818 var low
= y
- series
[j
][1][1];
1819 var high
= y
+ series
[j
][1][2];
1820 if (low
> y
) low
= y
; // this can happen with custom bars,
1821 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1822 if (maxY
=== null || high
> maxY
) {
1825 if (minY
=== null || low
< minY
) {
1830 for (j
= 0; j
< series
.length
; j
++) {
1832 if (y
=== null || isNaN(y
)) continue;
1833 if (maxY
=== null || y
> maxY
) {
1836 if (minY
=== null || y
< minY
) {
1842 return [minY
, maxY
];
1847 * This function is called once when the chart's data is changed or the options
1848 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1849 * idea is that values derived from the chart's data can be computed here,
1850 * rather than every time the chart is drawn. This includes things like the
1851 * number of axes, rolling averages, etc.
1853 Dygraph
.prototype.predraw_
= function() {
1854 var start
= new Date();
1856 // TODO(danvk): move more computations out of drawGraph_ and into here.
1857 this.computeYAxes_();
1859 // Create a new plotter.
1860 if (this.plotter_
) this.plotter_
.clear();
1861 this.plotter_
= new DygraphCanvasRenderer(this,
1866 // The roller sits in the bottom left corner of the chart. We don't know where
1867 // this will be until the options are available, so it's positioned here.
1868 this.createRollInterface_();
1870 // Same thing applies for the labelsDiv. It's right edge should be flush with
1871 // the right edge of the charting area (which may not be the same as the right
1872 // edge of the div, if we have two y-axes.
1873 this.positionLabelsDiv_();
1875 if (this.rangeSelector_
) {
1876 this.rangeSelector_
.renderStaticLayer();
1879 // Convert the raw data (a 2D array) into the internal format and compute
1880 // rolling averages.
1881 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
1882 for (var i
= 1; i
< this.numColumns(); i
++) {
1883 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
1884 var logScale
= this.attr_('logscale', i
);
1885 var series
= this.extractSeries_(this.rawData_
, i
, logScale
, connectSeparatedPoints
);
1886 series
= this.rollingAverage(series
, this.rollPeriod_
);
1887 this.rolledSeries_
.push(series
);
1890 // If the data or options have changed, then we'd better redraw.
1893 // This is used to determine whether to do various animations.
1894 var end
= new Date();
1895 this.drawingTimeMs_
= (end
- start
);
1899 * Loop over all fields and create datasets, calculating extreme y-values for
1900 * each series and extreme x-indices as we go.
1902 * dateWindow is passed in as an explicit parameter so that we can compute
1903 * extreme values "speculatively", i.e. without actually setting state on the
1906 * TODO(danvk): make this more of a true function
1907 * @return [ datasets, seriesExtremes, boundaryIds ]
1910 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
1911 var boundaryIds
= [];
1912 var cumulative_y
= []; // For stacked series.
1914 var extremes
= {}; // series name -> [low, high]
1917 // Loop over the fields (series). Go from the last to the first,
1918 // because if they're stacked that's how we accumulate the values.
1919 var num_series
= rolledSeries
.length
- 1;
1920 for (i
= num_series
; i
>= 1; i
--) {
1921 if (!this.visibility()[i
- 1]) continue;
1923 // TODO(danvk): is this copy really necessary?
1925 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
1926 series
.push(rolledSeries
[i
][j
]);
1929 // Prune down to the desired range, if necessary (for zooming)
1930 // Because there can be lines going to points outside of the visible area,
1931 // we actually prune to visible points, plus one on either side.
1932 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1934 var low
= dateWindow
[0];
1935 var high
= dateWindow
[1];
1937 // TODO(danvk): do binary search instead of linear search.
1938 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1939 var firstIdx
= null, lastIdx
= null;
1940 for (k
= 0; k
< series
.length
; k
++) {
1941 if (series
[k
][0] >= low
&& firstIdx
=== null) {
1944 if (series
[k
][0] <= high
) {
1948 if (firstIdx
=== null) firstIdx
= 0;
1949 if (firstIdx
> 0) firstIdx
--;
1950 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
1951 if (lastIdx
< series
.length
- 1) lastIdx
++;
1952 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
1953 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
1954 pruned
.push(series
[k
]);
1958 boundaryIds
[i
-1] = [0, series
.length
-1];
1961 var seriesExtremes
= this.extremeValues_(series
);
1964 for (j
=0; j
<series
.length
; j
++) {
1965 series
[j
] = [series
[j
][0],
1970 } else if (this.attr_("stackedGraph")) {
1971 var l
= series
.length
;
1973 for (j
= 0; j
< l
; j
++) {
1974 // If one data set has a NaN, let all subsequent stacked
1975 // sets inherit the NaN -- only start at 0 for the first set.
1976 var x
= series
[j
][0];
1977 if (cumulative_y
[x
] === undefined
) {
1978 cumulative_y
[x
] = 0;
1981 actual_y
= series
[j
][1];
1982 cumulative_y
[x
] += actual_y
;
1984 series
[j
] = [x
, cumulative_y
[x
]];
1986 if (cumulative_y
[x
] > seriesExtremes
[1]) {
1987 seriesExtremes
[1] = cumulative_y
[x
];
1989 if (cumulative_y
[x
] < seriesExtremes
[0]) {
1990 seriesExtremes
[0] = cumulative_y
[x
];
1995 var seriesName
= this.attr_("labels")[i
];
1996 extremes
[seriesName
] = seriesExtremes
;
1997 datasets
[i
] = series
;
2000 return [ datasets
, extremes
, boundaryIds
];
2004 * Update the graph with new data. This method is called when the viewing area
2005 * has changed. If the underlying data or options have changed, predraw_ will
2006 * be called before drawGraph_ is called.
2008 * clearSelection, when undefined or true, causes this.clearSelection to be
2009 * called at the end of the draw operation. This should rarely be defined,
2010 * and never true (that is it should be undefined most of the time, and
2015 Dygraph
.prototype.drawGraph_
= function(clearSelection
) {
2016 var start
= new Date();
2018 if (typeof(clearSelection
) === 'undefined') {
2019 clearSelection
= true;
2022 // This is used to set the second parameter to drawCallback, below.
2023 var is_initial_draw
= this.is_initial_draw_
;
2024 this.is_initial_draw_
= false;
2026 this.layout_
.removeAllDatasets();
2028 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2030 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2031 var datasets
= packed
[0];
2032 var extremes
= packed
[1];
2033 this.boundaryIds_
= packed
[2];
2035 for (var i
= 1; i
< datasets
.length
; i
++) {
2036 if (!this.visibility()[i
- 1]) continue;
2037 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
2040 this.computeYAxisRanges_(extremes
);
2041 this.layout_
.setYAxes(this.axes_
);
2045 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2046 var tmp_zoomed_x
= this.zoomed_x_
;
2047 // Tell PlotKit to use this new data and render itself
2048 this.layout_
.setDateWindow(this.dateWindow_
);
2049 this.zoomed_x_
= tmp_zoomed_x
;
2050 this.layout_
.evaluateWithError();
2051 this.renderGraph_(is_initial_draw
, false);
2053 if (this.attr_("timingName")) {
2054 var end
= new Date();
2056 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2061 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
, clearSelection
) {
2062 this.plotter_
.clear();
2063 this.plotter_
.render();
2064 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2065 this.canvas_
.height
);
2067 // Generate a static legend before any particular point is selected.
2068 this.setLegendHTML_();
2070 if (!is_initial_draw
) {
2071 if (clearSelection
) {
2072 if (typeof(this.selPoints_
) !== 'undefined' && this.selPoints_
.length
) {
2073 // We should select the point nearest the page x/y here
, but it
's easier
2074 // to just clear the selection. This prevents erroneous hover dots from
2076 this.clearSelection();
2078 this.clearSelection();
2083 if (this.rangeSelector_) {
2084 this.rangeSelector_.renderInteractiveLayer();
2087 if (this.attr_("drawCallback") !== null) {
2088 this.attr_("drawCallback")(this, is_initial_draw);
2094 * Determine properties of the y-axes which are independent of the data
2095 * currently being displayed. This includes things like the number of axes and
2096 * the style of the axes. It does not include the range of each axis and its
2098 * This fills in this.axes_ and this.seriesToAxisMap_.
2099 * axes_ = [ { options } ]
2100 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2101 * indices are into the axes_ array.
2103 Dygraph.prototype.computeYAxes_ = function() {
2104 // Preserve valueWindow settings if they exist, and if the user hasn't
2105 // specified a new valueRange.
2106 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2107 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2109 for (index
= 0; index
< this.axes_
.length
; index
++) {
2110 valueWindows
.push(this.axes_
[index
].valueWindow
);
2114 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2115 this.seriesToAxisMap_
= {};
2117 // Get a list of series names.
2118 var labels
= this.attr_("labels");
2120 for (i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2122 // all options which could be applied per-axis:
2130 'axisLabelFontSize',
2135 // Copy global axis options over to the first axis.
2136 for (i
= 0; i
< axisOptions
.length
; i
++) {
2137 var k
= axisOptions
[i
];
2139 if (v
) this.axes_
[0][k
] = v
;
2142 // Go through once and add all the axes.
2143 for (seriesName
in series
) {
2144 if (!series
.hasOwnProperty(seriesName
)) continue;
2145 axis
= this.attr_("axis", seriesName
);
2146 if (axis
=== null) {
2147 this.seriesToAxisMap_
[seriesName
] = 0;
2150 if (typeof(axis
) == 'object') {
2151 // Add a new axis, making a copy of its per-axis options.
2153 Dygraph
.update(opts
, this.axes_
[0]);
2154 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2155 var yAxisId
= this.axes_
.length
;
2156 opts
.yAxisId
= yAxisId
;
2158 Dygraph
.update(opts
, axis
);
2159 this.axes_
.push(opts
);
2160 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2164 // Go through one more time and assign series to an axis defined by another
2165 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2166 for (seriesName
in series
) {
2167 if (!series
.hasOwnProperty(seriesName
)) continue;
2168 axis
= this.attr_("axis", seriesName
);
2169 if (typeof(axis
) == 'string') {
2170 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2171 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2172 "series " + axis
+ ", which does not define its own axis.");
2175 var idx
= this.seriesToAxisMap_
[axis
];
2176 this.seriesToAxisMap_
[seriesName
] = idx
;
2180 if (valueWindows
!== undefined
) {
2181 // Restore valueWindow settings.
2182 for (index
= 0; index
< valueWindows
.length
; index
++) {
2183 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2188 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2190 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2191 v
= opts("valueRange");
2192 if (v
) this.axes_
[axis
].valueRange
= v
;
2193 } else { // To keep old behavior
2194 var axes
= this.user_attrs_
.axes
;
2195 if (axes
&& axes
.y2
) {
2196 v
= axes
.y2
.valueRange
;
2197 if (v
) this.axes_
[axis
].valueRange
= v
;
2205 * Returns the number of y-axes on the chart.
2206 * @return {Number} the number of axes.
2208 Dygraph
.prototype.numAxes
= function() {
2210 for (var series
in this.seriesToAxisMap_
) {
2211 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2212 var idx
= this.seriesToAxisMap_
[series
];
2213 if (idx
> last_axis
) last_axis
= idx
;
2215 return 1 + last_axis
;
2220 * Returns axis properties for the given series.
2221 * @param { String } setName The name of the series for which to get axis
2222 * properties, e.g. 'Y1'.
2223 * @return { Object } The axis properties.
2225 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2226 // TODO(danvk): handle errors.
2227 return this.axes_
[this.seriesToAxisMap_
[series
]];
2232 * Determine the value range and tick marks for each axis.
2233 * @param {Object} extremes A mapping from seriesName -> [low, high]
2234 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2236 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2237 // Build a map from axis number -> [list of series names]
2238 var seriesForAxis
= [], series
;
2239 for (series
in this.seriesToAxisMap_
) {
2240 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2241 var idx
= this.seriesToAxisMap_
[series
];
2242 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2243 seriesForAxis
[idx
].push(series
);
2246 // Compute extreme values, a span and tick marks for each axis.
2247 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2248 var axis
= this.axes_
[i
];
2250 if (!seriesForAxis
[i
]) {
2251 // If no series are defined or visible then use a reasonable default
2252 axis
.extremeRange
= [0, 1];
2254 // Calculate the extremes of extremes.
2255 series
= seriesForAxis
[i
];
2256 var minY
= Infinity
; // extremes[series[0]][0];
2257 var maxY
= -Infinity
; // extremes[series[0]][1];
2258 var extremeMinY
, extremeMaxY
;
2260 for (var j
= 0; j
< series
.length
; j
++) {
2261 // this skips invisible series
2262 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2264 // Only use valid extremes to stop null data series' from corrupting the scale.
2265 extremeMinY
= extremes
[series
[j
]][0];
2266 if (extremeMinY
!== null) {
2267 minY
= Math
.min(extremeMinY
, minY
);
2269 extremeMaxY
= extremes
[series
[j
]][1];
2270 if (extremeMaxY
!== null) {
2271 maxY
= Math
.max(extremeMaxY
, maxY
);
2274 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2276 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2277 if (minY
== Infinity
) minY
= 0;
2278 if (maxY
== -Infinity
) maxY
= 1;
2280 // Add some padding and round up to an integer to be human-friendly.
2281 var span
= maxY
- minY
;
2282 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2283 if (span
=== 0) { span
= maxY
; }
2285 var maxAxisY
, minAxisY
;
2286 if (axis
.logscale
) {
2287 maxAxisY
= maxY
+ 0.1 * span
;
2290 maxAxisY
= maxY
+ 0.1 * span
;
2291 minAxisY
= minY
- 0.1 * span
;
2293 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2294 if (!this.attr_("avoidMinZero")) {
2295 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2296 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2299 if (this.attr_("includeZero")) {
2300 if (maxY
< 0) maxAxisY
= 0;
2301 if (minY
> 0) minAxisY
= 0;
2304 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2306 if (axis
.valueWindow
) {
2307 // This is only set if the user has zoomed on the y-axis. It is never set
2308 // by a user. It takes precedence over axis.valueRange because, if you set
2309 // valueRange, you'd still expect to be able to pan.
2310 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2311 } else if (axis
.valueRange
) {
2312 // This is a user-set value range for this axis.
2313 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2315 axis
.computedValueRange
= axis
.extremeRange
;
2318 // Add ticks. By default, all axes inherit the tick positions of the
2319 // primary axis. However, if an axis is specifically marked as having
2320 // independent ticks, then that is permissible as well.
2321 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2322 var ticker
= opts('ticker');
2323 if (i
=== 0 || axis
.independentTicks
) {
2324 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2325 axis
.computedValueRange
[1],
2326 this.height_
, // TODO(danvk): should be area.height
2330 var p_axis
= this.axes_
[0];
2331 var p_ticks
= p_axis
.ticks
;
2332 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2333 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2334 var tick_values
= [];
2335 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2336 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2337 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2338 tick_values
.push(y_val
);
2341 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2342 axis
.computedValueRange
[1],
2343 this.height_
, // TODO(danvk): should be area.height
2352 * Extracts one series from the raw data (a 2D array) into an array of (date,
2355 * This is where undesirable points (i.e. negative values on log scales and
2356 * missing values through which we wish to connect lines) are dropped.
2360 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
, connectSeparatedPoints
) {
2362 for (var j
= 0; j
< rawData
.length
; j
++) {
2363 var x
= rawData
[j
][0];
2364 var point
= rawData
[j
][i
];
2366 // On the log scale, points less than zero do not exist.
2367 // This will create a gap in the chart. Note that this ignores
2368 // connectSeparatedPoints.
2372 series
.push([x
, point
]);
2374 if (point
!== null || !connectSeparatedPoints
) {
2375 series
.push([x
, point
]);
2384 * Calculates the rolling average of a data set.
2385 * If originalData is [label, val], rolls the average of those.
2386 * If originalData is [label, [, it's interpreted as [value, stddev]
2387 * and the roll is returned in the same form, with appropriately reduced
2388 * stddev for each value.
2389 * Note that this is where fractional input (i.e. '5/10') is converted into
2391 * @param {Array} originalData The data in the appropriate format (see above)
2392 * @param {Number} rollPeriod The number of points over which to average the
2395 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2396 if (originalData
.length
< 2)
2397 return originalData
;
2398 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2399 var rollingData
= [];
2400 var sigma
= this.attr_("sigma");
2402 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2403 if (this.fractions_
) {
2405 var den
= 0; // numerator/denominator
2407 for (i
= 0; i
< originalData
.length
; i
++) {
2408 num
+= originalData
[i
][1][0];
2409 den
+= originalData
[i
][1][1];
2410 if (i
- rollPeriod
>= 0) {
2411 num
-= originalData
[i
- rollPeriod
][1][0];
2412 den
-= originalData
[i
- rollPeriod
][1][1];
2415 var date
= originalData
[i
][0];
2416 var value
= den
? num
/ den
: 0.0;
2417 if (this.attr_("errorBars")) {
2418 if (this.attr_("wilsonInterval")) {
2419 // For more details on this confidence interval, see:
2420 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2422 var p
= value
< 0 ? 0 : value
, n
= den
;
2423 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2424 var denom
= 1 + sigma
* sigma
/ den
;
2425 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2426 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2427 rollingData
[i
] = [date
,
2428 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2430 rollingData
[i
] = [date
, [0, 0, 0]];
2433 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2434 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2437 rollingData
[i
] = [date
, mult
* value
];
2440 } else if (this.attr_("customBars")) {
2445 for (i
= 0; i
< originalData
.length
; i
++) {
2446 var data
= originalData
[i
][1];
2448 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2450 if (y
!== null && !isNaN(y
)) {
2456 if (i
- rollPeriod
>= 0) {
2457 var prev
= originalData
[i
- rollPeriod
];
2458 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2466 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2467 1.0 * (mid
- low
) / count
,
2468 1.0 * (high
- mid
) / count
]];
2470 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2474 // Calculate the rolling average for the first rollPeriod - 1 points where
2475 // there is not enough data to roll over the full number of points
2476 if (!this.attr_("errorBars")){
2477 if (rollPeriod
== 1) {
2478 return originalData
;
2481 for (i
= 0; i
< originalData
.length
; i
++) {
2484 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2485 y
= originalData
[j
][1];
2486 if (y
=== null || isNaN(y
)) continue;
2488 sum
+= originalData
[j
][1];
2491 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2493 rollingData
[i
] = [originalData
[i
][0], null];
2498 for (i
= 0; i
< originalData
.length
; i
++) {
2502 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2503 y
= originalData
[j
][1][0];
2504 if (y
=== null || isNaN(y
)) continue;
2506 sum
+= originalData
[j
][1][0];
2507 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2510 stddev
= Math
.sqrt(variance
) / num_ok
;
2511 rollingData
[i
] = [originalData
[i
][0],
2512 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2514 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2524 * Detects the type of the str (date or numeric) and sets the various
2525 * formatting attributes in this.attrs_ based on this type.
2526 * @param {String} str An x value.
2529 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2531 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2532 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2533 str
.indexOf('/') >= 0 ||
2534 isNaN(parseFloat(str
))) {
2536 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2537 // TODO(danvk): remove support for this format.
2542 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2543 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2544 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2545 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2547 /** @private (shut up, jsdoc!) */
2548 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2549 // TODO(danvk): use Dygraph.numberValueFormatter here?
2550 /** @private (shut up, jsdoc!) */
2551 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2552 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2553 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2558 * Parses the value as a floating point number. This is like the parseFloat()
2559 * built-in, but with a few differences:
2560 * - the empty string is parsed as null, rather than NaN.
2561 * - if the string cannot be parsed at all, an error is logged.
2562 * If the string can't be parsed, this method returns null.
2563 * @param {String} x The string to be parsed
2564 * @param {Number} opt_line_no The line number from which the string comes.
2565 * @param {String} opt_line The text of the line from which the string comes.
2569 // Parse the x as a float or return null if it's not a number.
2570 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2571 var val
= parseFloat(x
);
2572 if (!isNaN(val
)) return val
;
2574 // Try to figure out what happeend.
2575 // If the value is the empty string, parse it as null.
2576 if (/^ *$/.test(x
)) return null;
2578 // If it was actually "NaN", return it as NaN.
2579 if (/^ *nan *$/i.test(x
)) return NaN
;
2581 // Looks like a parsing error.
2582 var msg
= "Unable to parse '" + x
+ "' as a number";
2583 if (opt_line
!== null && opt_line_no
!== null) {
2584 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2593 * Parses a string in a special csv format. We expect a csv file where each
2594 * line is a date point, and the first field in each line is the date string.
2595 * We also expect that all remaining fields represent series.
2596 * if the errorBars attribute is set, then interpret the fields as:
2597 * date, series1, stddev1, series2, stddev2, ...
2598 * @param {[Object]} data See above.
2600 * @return [Object] An array with one entry for each row. These entries
2601 * are an array of cells in that row. The first entry is the parsed x-value for
2602 * the row. The second, third, etc. are the y-values. These can take on one of
2603 * three forms, depending on the CSV and constructor parameters:
2605 * 2. [ value, stddev ]
2606 * 3. [ low value, center value, high value ]
2608 Dygraph
.prototype.parseCSV_
= function(data
) {
2610 var lines
= data
.split("\n");
2613 // Use the default delimiter or fall back to a tab if that makes sense.
2614 var delim
= this.attr_('delimiter');
2615 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2620 if (!('labels' in this.user_attrs_
)) {
2621 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2623 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2628 var defaultParserSet
= false; // attempt to auto-detect x value type
2629 var expectedCols
= this.attr_("labels").length
;
2630 var outOfOrder
= false;
2631 for (var i
= start
; i
< lines
.length
; i
++) {
2632 var line
= lines
[i
];
2634 if (line
.length
=== 0) continue; // skip blank lines
2635 if (line
[0] == '#') continue; // skip comment lines
2636 var inFields
= line
.split(delim
);
2637 if (inFields
.length
< 2) continue;
2640 if (!defaultParserSet
) {
2641 this.detectTypeFromString_(inFields
[0]);
2642 xParser
= this.attr_("xValueParser");
2643 defaultParserSet
= true;
2645 fields
[0] = xParser(inFields
[0], this);
2647 // If fractions are expected, parse the numbers as "A/B
"
2648 if (this.fractions_) {
2649 for (j = 1; j < inFields.length; j++) {
2650 // TODO(danvk): figure out an appropriate way to flag parse errors.
2651 vals = inFields[j].split("/");
2652 if (vals.length != 2) {
2653 this.error('Expected fractional "num
/den
" values in CSV data ' +
2654 "but found a value
'" + inFields[j] + "' on line
" +
2655 (1 + i) + " ('" + line + "') which is not of
this form
.");
2658 fields[j] = [this.parseFloat_(vals[0], i, line),
2659 this.parseFloat_(vals[1], i, line)];
2662 } else if (this.attr_("errorBars
")) {
2663 // If there are error bars, values are (value, stddev) pairs
2664 if (inFields.length % 2 != 1) {
2665 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2666 'but line ' + (1 + i) + ' has an odd number of values (' +
2667 (inFields.length - 1) + "): '" + line + "'");
2669 for (j = 1; j < inFields.length; j += 2) {
2670 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2671 this.parseFloat_(inFields[j + 1], i, line)];
2673 } else if (this.attr_("customBars
")) {
2674 // Bars are a low;center;high tuple
2675 for (j = 1; j < inFields.length; j++) {
2676 var val = inFields[j];
2677 if (/^ *$/.test(val)) {
2678 fields[j] = [null, null, null];
2680 vals = val.split(";");
2681 if (vals.length == 3) {
2682 fields[j] = [ this.parseFloat_(vals[0], i, line),
2683 this.parseFloat_(vals[1], i, line),
2684 this.parseFloat_(vals[2], i, line) ];
2686 this.warn('When using customBars, values must be either blank ' +
2687 'or "low
;center
;high
" tuples (got "' + val +
2688 '" on line ' + (1+i));
2693 // Values are just numbers
2694 for (j = 1; j < inFields.length; j++) {
2695 fields[j] = this.parseFloat_(inFields[j], i, line);
2698 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2702 if (fields.length != expectedCols) {
2703 this.error("Number of columns
in line
" + i + " (" + fields.length +
2704 ") does not agree
with number of
labels (" + expectedCols +
2708 // If the user specified the 'labels' option and none of the cells of the
2709 // first row parsed correctly, then they probably double-specified the
2710 // labels. We go with the values set in the option, discard this row and
2711 // log a warning to the JS console.
2712 if (i === 0 && this.attr_('labels')) {
2713 var all_null = true;
2714 for (j = 0; all_null && j < fields.length; j++) {
2715 if (fields[j]) all_null = false;
2718 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2719 "CSV
data ('" + line + "') appears to also contain labels
. " +
2720 "Will drop the CSV labels and
use the option labels
.");
2728 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2729 ret.sort(function(a,b) { return a[0] - b[0]; });
2737 * The user has provided their data as a pre-packaged JS array. If the x values
2738 * are numeric, this is the same as dygraphs' internal format. If the x values
2739 * are dates, we need to convert them from Date objects to ms since epoch.
2740 * @param {[Object]} data
2741 * @return {[Object]} data with numeric x values.
2743 Dygraph.prototype.parseArray_ = function(data) {
2744 // Peek at the first x value to see if it's numeric.
2745 if (data.length === 0) {
2746 this.error("Can
't plot empty data set");
2749 if (data[0].length === 0) {
2750 this.error("Data set cannot contain an empty row");
2755 if (this.attr_("labels") === null) {
2756 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2757 "in the options parameter");
2758 this.attrs_.labels = [ "X" ];
2759 for (i = 1; i < data[0].length; i++) {
2760 this.attrs_.labels.push("Y" + i);
2764 if (Dygraph.isDateLike(data[0][0])) {
2765 // Some intelligent defaults for a date x-axis.
2766 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
2767 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
2768 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
2770 // Assume they're all dates
.
2771 var parsedData
= Dygraph
.clone(data
);
2772 for (i
= 0; i
< data
.length
; i
++) {
2773 if (parsedData
[i
].length
=== 0) {
2774 this.error("Row " + (1 + i
) + " of data is empty");
2777 if (parsedData
[i
][0] === null ||
2778 typeof(parsedData
[i
][0].getTime
) != 'function' ||
2779 isNaN(parsedData
[i
][0].getTime())) {
2780 this.error("x value in row " + (1 + i
) + " is not a Date");
2783 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2787 // Some intelligent defaults for a numeric x-axis.
2788 /** @private (shut up, jsdoc!) */
2789 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2790 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
2791 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2797 * Parses a DataTable object from gviz.
2798 * The data is expected to have a first column that is either a date or a
2799 * number. All subsequent columns must be numbers. If there is a clear mismatch
2800 * between this.xValueParser_ and the type of the first column, it will be
2801 * fixed. Fills out rawData_.
2802 * @param {[Object]} data See above.
2805 Dygraph
.prototype.parseDataTable_
= function(data
) {
2806 var shortTextForAnnotationNum
= function(num
) {
2807 // converts [0-9]+ [A-Z][a-z]*
2808 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
2809 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
2810 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
2811 num
= Math
.floor(num
/ 26);
2813 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
2814 num
= Math
.floor((num
- 1) / 26);
2819 var cols
= data
.getNumberOfColumns();
2820 var rows
= data
.getNumberOfRows();
2822 var indepType
= data
.getColumnType(0);
2823 if (indepType
== 'date' || indepType
== 'datetime') {
2824 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2825 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2826 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2827 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2828 } else if (indepType
== 'number') {
2829 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2830 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2831 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2832 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2834 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2835 "column 1 of DataTable input (Got '" + indepType
+ "')");
2839 // Array of the column indices which contain data (and not annotations).
2841 var annotationCols
= {}; // data index -> [annotation cols]
2842 var hasAnnotations
= false;
2844 for (i
= 1; i
< cols
; i
++) {
2845 var type
= data
.getColumnType(i
);
2846 if (type
== 'number') {
2848 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2849 // This is OK -- it's an annotation column.
2850 var dataIdx
= colIdx
[colIdx
.length
- 1];
2851 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2852 annotationCols
[dataIdx
] = [i
];
2854 annotationCols
[dataIdx
].push(i
);
2856 hasAnnotations
= true;
2858 this.error("Only 'number' is supported as a dependent type with Gviz." +
2859 " 'string' is only supported if displayAnnotations is true");
2863 // Read column labels
2864 // TODO(danvk): add support back for errorBars
2865 var labels
= [data
.getColumnLabel(0)];
2866 for (i
= 0; i
< colIdx
.length
; i
++) {
2867 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2868 if (this.attr_("errorBars")) i
+= 1;
2870 this.attrs_
.labels
= labels
;
2871 cols
= labels
.length
;
2874 var outOfOrder
= false;
2875 var annotations
= [];
2876 for (i
= 0; i
< rows
; i
++) {
2878 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2879 data
.getValue(i
, 0) === null) {
2880 this.warn("Ignoring row " + i
+
2881 " of DataTable because of undefined or null first column.");
2885 if (indepType
== 'date' || indepType
== 'datetime') {
2886 row
.push(data
.getValue(i
, 0).getTime());
2888 row
.push(data
.getValue(i
, 0));
2890 if (!this.attr_("errorBars")) {
2891 for (j
= 0; j
< colIdx
.length
; j
++) {
2892 var col
= colIdx
[j
];
2893 row
.push(data
.getValue(i
, col
));
2894 if (hasAnnotations
&&
2895 annotationCols
.hasOwnProperty(col
) &&
2896 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
2898 ann
.series
= data
.getColumnLabel(col
);
2900 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
2902 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2903 if (k
) ann
.text
+= "\n";
2904 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2906 annotations
.push(ann
);
2910 // Strip out infinities, which give dygraphs problems later on.
2911 for (j
= 0; j
< row
.length
; j
++) {
2912 if (!isFinite(row
[j
])) row
[j
] = null;
2915 for (j
= 0; j
< cols
- 1; j
++) {
2916 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2919 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2926 this.warn("DataTable is out of order; order it correctly to speed loading.");
2927 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
2929 this.rawData_
= ret
;
2931 if (annotations
.length
> 0) {
2932 this.setAnnotations(annotations
, true);
2937 * Get the CSV data. If it's in a function, call that function. If it's in a
2938 * file, do an XMLHttpRequest to get it.
2941 Dygraph
.prototype.start_
= function() {
2942 var data
= this.file_
;
2944 // Functions can return references of all other types.
2945 if (typeof data
== 'function') {
2949 if (Dygraph
.isArrayLike(data
)) {
2950 this.rawData_
= this.parseArray_(data
);
2952 } else if (typeof data
== 'object' &&
2953 typeof data
.getColumnRange
== 'function') {
2954 // must be a DataTable from gviz.
2955 this.parseDataTable_(data
);
2957 } else if (typeof data
== 'string') {
2958 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2959 if (data
.indexOf('\n') >= 0) {
2960 this.loadedEvent_(data
);
2962 var req
= new XMLHttpRequest();
2964 req
.onreadystatechange
= function () {
2965 if (req
.readyState
== 4) {
2966 if (req
.status
=== 200 || // Normal http
2967 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
2968 caller
.loadedEvent_(req
.responseText
);
2973 req
.open("GET", data
, true);
2977 this.error("Unknown data format: " + (typeof data
));
2982 * Changes various properties of the graph. These can include:
2984 * <li>file: changes the source data for the graph</li>
2985 * <li>errorBars: changes whether the data contains stddev</li>
2988 * There's a huge variety of options that can be passed to this method. For a
2989 * full list, see http://dygraphs.com/options.html.
2991 * @param {Object} attrs The new properties and values
2992 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
2993 * call to updateOptions(). If you know better, you can pass true to explicitly
2994 * block the redraw. This can be useful for chaining updateOptions() calls,
2995 * avoiding the occasional infinite loop and preventing redraws when it's not
2996 * necessary (e.g. when updating a callback).
2998 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
2999 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3001 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3002 var file
= input_attrs
.file
;
3003 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3005 // TODO(danvk): this is a mess. Move these options into attr_.
3006 if ('rollPeriod' in attrs
) {
3007 this.rollPeriod_
= attrs
.rollPeriod
;
3009 if ('dateWindow' in attrs
) {
3010 this.dateWindow_
= attrs
.dateWindow
;
3011 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3012 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3015 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3016 this.zoomed_y_
= (attrs
.valueRange
!== null);
3019 // TODO(danvk): validate per-series options.
3024 // highlightCircleSize
3026 // Check if this set options will require new points.
3027 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3029 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3033 if (!block_redraw
) this.start_();
3035 if (!block_redraw
) {
3036 if (requiresNewPoints
) {
3039 this.renderGraph_(false, false);
3046 * Returns a copy of the options with deprecated names converted into current
3047 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3048 * interested in that, they should save a copy before calling this.
3051 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3053 for (var k
in attrs
) {
3054 if (k
== 'file') continue;
3055 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3058 var set
= function(axis
, opt
, value
) {
3059 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3060 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3061 my_attrs
.axes
[axis
][opt
] = value
;
3063 var map
= function(opt
, axis
, new_opt
) {
3064 if (typeof(attrs
[opt
]) != 'undefined') {
3065 set(axis
, new_opt
, attrs
[opt
]);
3066 delete my_attrs
[opt
];
3070 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3071 map('xValueFormatter', 'x', 'valueFormatter');
3072 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3073 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3074 map('xTicker', 'x', 'ticker');
3075 map('yValueFormatter', 'y', 'valueFormatter');
3076 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3077 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3078 map('yTicker', 'y', 'ticker');
3083 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3084 * containing div (which has presumably changed size since the dygraph was
3085 * instantiated. If the width/height are specified, the div will be resized.
3087 * This is far more efficient than destroying and re-instantiating a
3088 * Dygraph, since it doesn't have to reparse the underlying data.
3090 * @param {Number} [width] Width (in pixels)
3091 * @param {Number} [height] Height (in pixels)
3093 Dygraph
.prototype.resize
= function(width
, height
) {
3094 if (this.resize_lock
) {
3097 this.resize_lock
= true;
3099 if ((width
=== null) != (height
=== null)) {
3100 this.warn("Dygraph.resize() should be called with zero parameters or " +
3101 "two non-NULL parameters. Pretending it was zero.");
3102 width
= height
= null;
3105 var old_width
= this.width_
;
3106 var old_height
= this.height_
;
3109 this.maindiv_
.style
.width
= width
+ "px";
3110 this.maindiv_
.style
.height
= height
+ "px";
3111 this.width_
= width
;
3112 this.height_
= height
;
3114 this.width_
= this.maindiv_
.clientWidth
;
3115 this.height_
= this.maindiv_
.clientHeight
;
3118 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3119 // TODO(danvk): there should be a clear() method.
3120 this.maindiv_
.innerHTML
= "";
3121 this.roller_
= null;
3122 this.attrs_
.labelsDiv
= null;
3123 this.createInterface_();
3124 if (this.annotations_
.length
) {
3125 // createInterface_ reset the layout, so we need to do this.
3126 this.layout_
.setAnnotations(this.annotations_
);
3131 this.resize_lock
= false;
3135 * Adjusts the number of points in the rolling average. Updates the graph to
3136 * reflect the new averaging period.
3137 * @param {Number} length Number of points over which to average the data.
3139 Dygraph
.prototype.adjustRoll
= function(length
) {
3140 this.rollPeriod_
= length
;
3145 * Returns a boolean array of visibility statuses.
3147 Dygraph
.prototype.visibility
= function() {
3148 // Do lazy-initialization, so that this happens after we know the number of
3150 if (!this.attr_("visibility")) {
3151 this.attrs_
.visibility
= [];
3153 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3154 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3155 this.attrs_
.visibility
.push(true);
3157 return this.attr_("visibility");
3161 * Changes the visiblity of a series.
3163 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3164 var x
= this.visibility();
3165 if (num
< 0 || num
>= x
.length
) {
3166 this.warn("invalid series number in setVisibility: " + num
);
3174 * How large of an area will the dygraph render itself in?
3175 * This is used for testing.
3176 * @return A {width: w, height: h} object.
3179 Dygraph
.prototype.size
= function() {
3180 return { width
: this.width_
, height
: this.height_
};
3184 * Update the list of annotations and redraw the chart.
3185 * See dygraphs.com/annotations.html for more info on how to use annotations.
3186 * @param ann {Array} An array of annotation objects.
3187 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3189 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3190 // Only add the annotation CSS rule once we know it will be used.
3191 Dygraph
.addAnnotationRule();
3192 this.annotations_
= ann
;
3193 this.layout_
.setAnnotations(this.annotations_
);
3194 if (!suppressDraw
) {
3200 * Return the list of annotations.
3202 Dygraph
.prototype.annotations
= function() {
3203 return this.annotations_
;
3207 * Get the index of a series (column) given its name. The first column is the
3208 * x-axis, so the data series start with index 1.
3210 Dygraph
.prototype.indexFromSetName
= function(name
) {
3211 var labels
= this.attr_("labels");
3212 for (var i
= 0; i
< labels
.length
; i
++) {
3213 if (labels
[i
] == name
) return i
;
3220 * Adds a default style for the annotation CSS classes to the document. This is
3221 * only executed when annotations are actually used. It is designed to only be
3222 * called once -- all calls after the first will return immediately.
3224 Dygraph
.addAnnotationRule
= function() {
3225 if (Dygraph
.addedAnnotationCSS
) return;
3227 var rule
= "border: 1px solid black; " +
3228 "background-color: white; " +
3229 "text-align: center;";
3231 var styleSheetElement
= document
.createElement("style");
3232 styleSheetElement
.type
= "text/css";
3233 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3235 // Find the first style sheet that we can access.
3236 // We may not add a rule to a style sheet from another domain for security
3237 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3238 // adds its own style sheets from google.com.
3239 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3240 if (document
.styleSheets
[i
].disabled
) continue;
3241 var mysheet
= document
.styleSheets
[i
];
3243 if (mysheet
.insertRule
) { // Firefox
3244 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3245 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3246 } else if (mysheet
.addRule
) { // IE
3247 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3249 Dygraph
.addedAnnotationCSS
= true;
3252 // Was likely a security exception.
3256 this.warn("Unable to add default annotation CSS rule; display may be off.");
3259 // Older pages may still use this name.
3260 var DateGraph
= Dygraph
;