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_
= [];
400 this.setIndexByName_
= {};
402 // Create the containing DIV and other interactive elements
403 this.createInterface_();
409 * Returns the zoomed status of the chart for one or both axes.
411 * Axis is an optional parameter. Can be set to 'x' or 'y'.
413 * The zoomed status for an axis is set whenever a user zooms using the mouse
414 * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom
415 * option is also specified).
417 Dygraph
.prototype.isZoomed
= function(axis
) {
418 if (axis
== null) return this.zoomed_x_
|| this.zoomed_y_
;
419 if (axis
=== 'x') return this.zoomed_x_
;
420 if (axis
=== 'y') return this.zoomed_y_
;
421 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
425 * Returns information about the Dygraph object, including its containing ID.
427 Dygraph
.prototype.toString
= function() {
428 var maindiv
= this.maindiv_
;
429 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
430 return "[Dygraph " + id
+ "]";
435 * Returns the value of an option. This may be set by the user (either in the
436 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
438 * @param { String } name The name of the option, e.g. 'rollPeriod'.
439 * @param { String } [seriesName] The name of the series to which the option
440 * will be applied. If no per-series value of this option is available, then
441 * the global value is returned. This is optional.
442 * @return { ... } The value of the option.
444 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
445 // <REMOVE_FOR_COMBINED>
446 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
447 this.error('Must include options reference JS for testing');
448 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
449 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
450 'in the Dygraphs.OPTIONS_REFERENCE listing.');
451 // Only log this error once.
452 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
454 // </REMOVE_FOR_COMBINED
>
456 typeof(this.user_attrs_
[seriesName
]) != 'undefined' &&
457 this.user_attrs_
[seriesName
] !== null &&
458 typeof(this.user_attrs_
[seriesName
][name
]) != 'undefined') {
459 return this.user_attrs_
[seriesName
][name
];
460 } else if (typeof(this.user_attrs_
[name
]) != 'undefined') {
461 return this.user_attrs_
[name
];
462 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
463 return this.attrs_
[name
];
471 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
472 * @return { ... } A function mapping string -> option value
474 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
476 return function(opt
) {
477 var axis_opts
= self
.user_attrs_
.axes
;
478 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
479 return axis_opts
[axis
][opt
];
481 // user-specified attributes always trump defaults, even if they're less
483 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
484 return self
.user_attrs_
[opt
];
487 axis_opts
= self
.attrs_
.axes
;
488 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
489 return axis_opts
[axis
][opt
];
491 // check old-style axis options
492 // TODO(danvk): add a deprecation warning if either of these match.
493 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
494 return self
.axes_
[0][opt
];
495 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
496 return self
.axes_
[1][opt
];
498 return self
.attr_(opt
);
503 * Returns the current rolling period, as set by the user or an option.
504 * @return {Number} The number of points in the rolling window
506 Dygraph
.prototype.rollPeriod
= function() {
507 return this.rollPeriod_
;
511 * Returns the currently-visible x-range. This can be affected by zooming,
512 * panning or a call to updateOptions.
513 * Returns a two-element array: [left, right].
514 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
516 Dygraph
.prototype.xAxisRange
= function() {
517 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
521 * Returns the lower- and upper-bound x-axis values of the
524 Dygraph
.prototype.xAxisExtremes
= function() {
525 var left
= this.rawData_
[0][0];
526 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
527 return [left
, right
];
531 * Returns the currently-visible y-range for an axis. This can be affected by
532 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
533 * called with no arguments, returns the range of the first axis.
534 * Returns a two-element array: [bottom, top].
536 Dygraph
.prototype.yAxisRange
= function(idx
) {
537 if (typeof(idx
) == "undefined") idx
= 0;
538 if (idx
< 0 || idx
>= this.axes_
.length
) {
541 var axis
= this.axes_
[idx
];
542 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
546 * Returns the currently-visible y-ranges for each axis. This can be affected by
547 * zooming, panning, calls to updateOptions, etc.
548 * Returns an array of [bottom, top] pairs, one for each y-axis.
550 Dygraph
.prototype.yAxisRanges
= function() {
552 for (var i
= 0; i
< this.axes_
.length
; i
++) {
553 ret
.push(this.yAxisRange(i
));
558 // TODO(danvk): use these functions throughout dygraphs.
560 * Convert from data coordinates to canvas/div X/Y coordinates.
561 * If specified, do this conversion for the coordinate system of a particular
562 * axis. Uses the first axis by default.
563 * Returns a two-element array: [X, Y]
565 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
566 * instead of toDomCoords(null, y, axis).
568 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
569 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
573 * Convert from data x coordinates to canvas/div X coordinate.
574 * If specified, do this conversion for the coordinate system of a particular
576 * Returns a single value or null if x is null.
578 Dygraph
.prototype.toDomXCoord
= function(x
) {
583 var area
= this.plotter_
.area
;
584 var xRange
= this.xAxisRange();
585 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
589 * Convert from data x coordinates to canvas/div Y coordinate and optional
590 * axis. Uses the first axis by default.
592 * returns a single value or null if y is null.
594 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
595 var pct
= this.toPercentYCoord(y
, axis
);
600 var area
= this.plotter_
.area
;
601 return area
.y
+ pct
* area
.h
;
605 * Convert from canvas/div coords to data coordinates.
606 * If specified, do this conversion for the coordinate system of a particular
607 * axis. Uses the first axis by default.
608 * Returns a two-element array: [X, Y].
610 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
611 * instead of toDataCoords(null, y, axis).
613 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
614 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
618 * Convert from canvas/div x coordinate to data coordinate.
620 * If x is null, this returns null.
622 Dygraph
.prototype.toDataXCoord
= function(x
) {
627 var area
= this.plotter_
.area
;
628 var xRange
= this.xAxisRange();
629 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
633 * Convert from canvas/div y coord to value.
635 * If y is null, this returns null.
636 * if axis is null, this uses the first axis.
638 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
643 var area
= this.plotter_
.area
;
644 var yRange
= this.yAxisRange(axis
);
646 if (typeof(axis
) == "undefined") axis
= 0;
647 if (!this.axes_
[axis
].logscale
) {
648 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
650 // Computing the inverse of toDomCoord.
651 var pct
= (y
- area
.y
) / area
.h
;
653 // Computing the inverse of toPercentYCoord. The function was arrived at with
654 // the following steps:
656 // Original calcuation:
657 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
659 // Move denominator to both sides:
660 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
662 // subtract logr1, and take the negative value.
663 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
665 // Swap both sides of the equation, and we can compute the log of the
666 // return value. Which means we just need to use that as the exponent in
668 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
670 var logr1
= Dygraph
.log10(yRange
[1]);
671 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
672 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
678 * Converts a y for an axis to a percentage from the top to the
679 * bottom of the drawing area.
681 * If the coordinate represents a value visible on the canvas, then
682 * the value will be between 0 and 1, where 0 is the top of the canvas.
683 * However, this method will return values outside the range, as
684 * values can fall outside the canvas.
686 * If y is null, this returns null.
687 * if axis is null, this uses the first axis.
689 * @param { Number } y The data y-coordinate.
690 * @param { Number } [axis] The axis number on which the data coordinate lives.
691 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
693 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
697 if (typeof(axis
) == "undefined") axis
= 0;
699 var yRange
= this.yAxisRange(axis
);
702 if (!this.axes_
[axis
].logscale
) {
703 // yRange[1] - y is unit distance from the bottom.
704 // yRange[1] - yRange[0] is the scale of the range.
705 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
706 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
708 var logr1
= Dygraph
.log10(yRange
[1]);
709 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
715 * Converts an x value to a percentage from the left to the right of
718 * If the coordinate represents a value visible on the canvas, then
719 * the value will be between 0 and 1, where 0 is the left of the canvas.
720 * However, this method will return values outside the range, as
721 * values can fall outside the canvas.
723 * If x is null, this returns null.
724 * @param { Number } x The data x-coordinate.
725 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
727 Dygraph
.prototype.toPercentXCoord
= function(x
) {
732 var xRange
= this.xAxisRange();
733 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
737 * Returns the number of columns (including the independent variable).
738 * @return { Integer } The number of columns.
740 Dygraph
.prototype.numColumns
= function() {
741 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
745 * Returns the number of rows (excluding any header/label row).
746 * @return { Integer } The number of rows, less any header.
748 Dygraph
.prototype.numRows
= function() {
749 return this.rawData_
.length
;
753 * Returns the full range of the x-axis, as determined by the most extreme
754 * values in the data set. Not affected by zooming, visibility, etc.
755 * TODO(danvk): merge w/ xAxisExtremes
756 * @return { Array<Number> } A [low, high] pair
759 Dygraph
.prototype.fullXRange_
= function() {
760 if (this.numRows() > 0) {
761 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
768 * Returns the value in the given row and column. If the row and column exceed
769 * the bounds on the data, returns null. Also returns null if the value is
771 * @param { Number} row The row number of the data (0-based). Row 0 is the
772 * first row of data, not a header row.
773 * @param { Number} col The column number of the data (0-based)
774 * @return { Number } The value in the specified cell or null if the row/col
777 Dygraph
.prototype.getValue
= function(row
, col
) {
778 if (row
< 0 || row
> this.rawData_
.length
) return null;
779 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
781 return this.rawData_
[row
][col
];
785 * Generates interface elements for the Dygraph: a containing div, a div to
786 * display the current point, and a textbox to adjust the rolling average
787 * period. Also creates the Renderer/Layout elements.
790 Dygraph
.prototype.createInterface_
= function() {
791 // Create the all-enclosing graph div
792 var enclosing
= this.maindiv_
;
794 this.graphDiv
= document
.createElement("div");
795 this.graphDiv
.style
.width
= this.width_
+ "px";
796 this.graphDiv
.style
.height
= this.height_
+ "px";
797 enclosing
.appendChild(this.graphDiv
);
799 // Create the canvas for interactive parts of the chart.
800 this.canvas_
= Dygraph
.createCanvas();
801 this.canvas_
.style
.position
= "absolute";
802 this.canvas_
.width
= this.width_
;
803 this.canvas_
.height
= this.height_
;
804 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
805 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
807 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
809 // ... and for static parts of the chart.
810 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
811 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
813 if (this.attr_('showRangeSelector')) {
814 // The range selector must be created here so that its canvases and contexts get created here.
815 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
816 // The range selector also sets xAxisHeight in order to reserve space.
817 this.rangeSelector_
= new DygraphRangeSelector(this);
820 // The interactive parts of the graph are drawn on top of the chart.
821 this.graphDiv
.appendChild(this.hidden_
);
822 this.graphDiv
.appendChild(this.canvas_
);
823 this.mouseEventElement_
= this.createMouseEventElement_();
825 // Create the grapher
826 this.layout_
= new DygraphLayout(this);
828 if (this.rangeSelector_
) {
829 // This needs to happen after the graph canvases are added to the div and the layout object is created.
830 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
834 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(e
) {
835 dygraph
.mouseMove_(e
);
837 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(e
) {
838 dygraph
.mouseOut_(e
);
841 this.createStatusMessage_();
842 this.createDragInterface_();
844 this.resizeHandler
= function(e
) {
848 // Update when the window is resized.
849 // TODO(danvk): drop frames depending on complexity of the chart.
850 Dygraph
.addEvent(window
, 'resize', this.resizeHandler
);
854 * Detach DOM elements in the dygraph and null out all data references.
855 * Calling this when you're done with a dygraph can dramatically reduce memory
856 * usage. See, e.g., the tests/perf.html example.
858 Dygraph
.prototype.destroy
= function() {
859 var removeRecursive
= function(node
) {
860 while (node
.hasChildNodes()) {
861 removeRecursive(node
.firstChild
);
862 node
.removeChild(node
.firstChild
);
865 removeRecursive(this.maindiv_
);
867 var nullOut
= function(obj
) {
869 if (typeof(obj
[n
]) === 'object') {
874 // remove event handlers
875 Dygraph
.removeEvent(window
,'resize',this.resizeHandler
);
876 this.resizeHandler
= null;
877 // These may not all be necessary, but it can't hurt...
878 nullOut(this.layout_
);
879 nullOut(this.plotter_
);
884 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
885 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
886 * or the zoom rectangles) is done on this.canvas_.
887 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
888 * @return {Object} The newly-created canvas
891 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
892 var h
= Dygraph
.createCanvas();
893 h
.style
.position
= "absolute";
894 // TODO(danvk): h should be offset from canvas. canvas needs to include
895 // some extra area to make it easier to zoom in on the far left and far
896 // right. h needs to be precisely the plot area, so that clipping occurs.
897 h
.style
.top
= canvas
.style
.top
;
898 h
.style
.left
= canvas
.style
.left
;
899 h
.width
= this.width_
;
900 h
.height
= this.height_
;
901 h
.style
.width
= this.width_
+ "px"; // for IE
902 h
.style
.height
= this.height_
+ "px"; // for IE
907 * Creates an overlay element used to handle mouse events.
908 * @return {Object} The mouse event element.
911 Dygraph
.prototype.createMouseEventElement_
= function() {
912 if (this.isUsingExcanvas_
) {
913 var elem
= document
.createElement("div");
914 elem
.style
.position
= 'absolute';
915 elem
.style
.backgroundColor
= 'white';
916 elem
.style
.filter
= 'alpha(opacity=0)';
917 elem
.style
.width
= this.width_
+ "px";
918 elem
.style
.height
= this.height_
+ "px";
919 this.graphDiv
.appendChild(elem
);
927 * Generate a set of distinct colors for the data series. This is done with a
928 * color wheel. Saturation/Value are customizable, and the hue is
929 * equally-spaced around the color wheel. If a custom set of colors is
930 * specified, that is used instead.
933 Dygraph
.prototype.setColors_
= function() {
934 var num
= this.attr_("labels").length
- 1;
936 var colors
= this.attr_('colors');
939 var sat
= this.attr_('colorSaturation') || 1.0;
940 var val
= this.attr_('colorValue') || 0.5;
941 var half
= Math
.ceil(num
/ 2);
942 for (i
= 1; i
<= num
; i
++) {
943 if (!this.visibility()[i
-1]) continue;
944 // alternate colors for high contrast.
945 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
946 var hue
= (1.0 * idx
/ (1 + num
));
947 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
950 for (i
= 0; i
< num
; i
++) {
951 if (!this.visibility()[i
]) continue;
952 var colorStr
= colors
[i
% colors
.length
];
953 this.colors_
.push(colorStr
);
957 this.plotter_
.setColors(this.colors_
);
961 * Return the list of colors. This is either the list of colors passed in the
962 * attributes or the autogenerated list of rgb(r,g,b) strings.
963 * @return {Array<string>} The list of colors.
965 Dygraph
.prototype.getColors
= function() {
970 * Create the div that contains information on the selected point(s)
971 * This goes in the top right of the canvas, unless an external div has already
975 Dygraph
.prototype.createStatusMessage_
= function() {
976 var userLabelsDiv
= this.user_attrs_
.labelsDiv
;
977 if (userLabelsDiv
&& null !== userLabelsDiv
&&
978 (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
979 this.user_attrs_
.labelsDiv
= document
.getElementById(userLabelsDiv
);
981 if (!this.attr_("labelsDiv")) {
982 var divWidth
= this.attr_('labelsDivWidth');
984 "position": "absolute",
987 "width": divWidth
+ "px",
989 "left": (this.width_
- divWidth
- 2) + "px",
990 "background": "white",
992 "overflow": "hidden"};
993 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
994 var div
= document
.createElement("div");
995 div
.className
= "dygraph-legend";
996 for (var name
in messagestyle
) {
997 if (messagestyle
.hasOwnProperty(name
)) {
998 div
.style
[name
] = messagestyle
[name
];
1001 this.graphDiv
.appendChild(div
);
1002 this.attrs_
.labelsDiv
= div
;
1007 * Position the labels div so that:
1008 * - its right edge is flush with the right edge of the charting area
1009 * - its top edge is flush with the top edge of the charting area
1012 Dygraph
.prototype.positionLabelsDiv_
= function() {
1013 // Don't touch a user-specified labelsDiv.
1014 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
1016 var area
= this.plotter_
.area
;
1017 var div
= this.attr_("labelsDiv");
1018 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
1019 div
.style
.top
= area
.y
+ "px";
1023 * Create the text box to adjust the averaging period
1026 Dygraph
.prototype.createRollInterface_
= function() {
1027 // Create a roller if one doesn't exist already.
1028 if (!this.roller_
) {
1029 this.roller_
= document
.createElement("input");
1030 this.roller_
.type
= "text";
1031 this.roller_
.style
.display
= "none";
1032 this.graphDiv
.appendChild(this.roller_
);
1035 var display
= this.attr_('showRoller') ? 'block' : 'none';
1037 var area
= this.plotter_
.area
;
1038 var textAttr
= { "position": "absolute",
1040 "top": (area
.y
+ area
.h
- 25) + "px",
1041 "left": (area
.x
+ 1) + "px",
1044 this.roller_
.size
= "2";
1045 this.roller_
.value
= this.rollPeriod_
;
1046 for (var name
in textAttr
) {
1047 if (textAttr
.hasOwnProperty(name
)) {
1048 this.roller_
.style
[name
] = textAttr
[name
];
1053 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1058 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1059 * canvas (i.e. DOM Coords).
1061 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1062 return Dygraph
.pageX(e
) - context
.px
;
1067 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1068 * canvas (i.e. DOM Coords).
1070 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1071 return Dygraph
.pageY(e
) - context
.py
;
1075 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1079 Dygraph
.prototype.createDragInterface_
= function() {
1081 // Tracks whether the mouse is down right now
1083 isPanning
: false, // is this drag part of a pan?
1084 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1085 dragStartX
: null, // pixel coordinates
1086 dragStartY
: null, // pixel coordinates
1087 dragEndX
: null, // pixel coordinates
1088 dragEndY
: null, // pixel coordinates
1089 dragDirection
: null,
1090 prevEndX
: null, // pixel coordinates
1091 prevEndY
: null, // pixel coordinates
1092 prevDragDirection
: null,
1094 // The value on the left side of the graph when a pan operation starts.
1095 initialLeftmostDate
: null,
1097 // The number of units each pixel spans. (This won't be valid for log
1099 xUnitsPerPixel
: null,
1101 // TODO(danvk): update this comment
1102 // The range in second/value units that the viewport encompasses during a
1103 // panning operation.
1106 // Top-left corner of the canvas, in DOM coords
1107 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1111 // Values for use with panEdgeFraction, which limit how far outside the
1112 // graph's data boundaries it can be panned.
1113 boundedDates
: null, // [minDate, maxDate]
1114 boundedValues
: null, // [[minValue, maxValue] ...]
1116 initializeMouseDown
: function(event
, g
, context
) {
1117 // prevents mouse drags from selecting page text.
1118 if (event
.preventDefault
) {
1119 event
.preventDefault(); // Firefox, Chrome, etc.
1121 event
.returnValue
= false; // IE
1122 event
.cancelBubble
= true;
1125 context
.px
= Dygraph
.findPosX(g
.canvas_
);
1126 context
.py
= Dygraph
.findPosY(g
.canvas_
);
1127 context
.dragStartX
= g
.dragGetX_(event
, context
);
1128 context
.dragStartY
= g
.dragGetY_(event
, context
);
1132 var interactionModel
= this.attr_("interactionModel");
1134 // Self is the graph.
1137 // Function that binds the graph and context to the handler.
1138 var bindHandler
= function(handler
) {
1139 return function(event
) {
1140 handler(event
, self
, context
);
1144 for (var eventName
in interactionModel
) {
1145 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1146 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
1147 bindHandler(interactionModel
[eventName
]));
1150 // If the user releases the mouse button during a drag, but not over the
1151 // canvas, then it doesn't count as a zooming action.
1152 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
1153 if (context
.isZooming
|| context
.isPanning
) {
1154 context
.isZooming
= false;
1155 context
.dragStartX
= null;
1156 context
.dragStartY
= null;
1159 if (context
.isPanning
) {
1160 context
.isPanning
= false;
1161 context
.draggingDate
= null;
1162 context
.dateRange
= null;
1163 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1164 delete self
.axes_
[i
].draggingValue
;
1165 delete self
.axes_
[i
].dragValueRange
;
1172 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1173 * up any previous zoom rectangles that were drawn. This could be optimized to
1174 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1177 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1178 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1179 * @param {Number} startX The X position where the drag started, in canvas
1181 * @param {Number} endX The current X position of the drag, in canvas coords.
1182 * @param {Number} startY The Y position where the drag started, in canvas
1184 * @param {Number} endY The current Y position of the drag, in canvas coords.
1185 * @param {Number} prevDirection the value of direction on the previous call to
1186 * this function. Used to avoid excess redrawing
1187 * @param {Number} prevEndX The value of endX on the previous call to this
1188 * function. Used to avoid excess redrawing
1189 * @param {Number} prevEndY The value of endY on the previous call to this
1190 * function. Used to avoid excess redrawing
1193 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1194 endY
, prevDirection
, prevEndX
,
1196 var ctx
= this.canvas_ctx_
;
1198 // Clean up from the previous rect if necessary
1199 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1200 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1201 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1202 } else if (prevDirection
== Dygraph
.VERTICAL
){
1203 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1204 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1207 // Draw a light-grey rectangle to show the new viewing area
1208 if (direction
== Dygraph
.HORIZONTAL
) {
1209 if (endX
&& startX
) {
1210 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1211 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1212 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1214 } else if (direction
== Dygraph
.VERTICAL
) {
1215 if (endY
&& startY
) {
1216 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1217 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1218 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1222 if (this.isUsingExcanvas_
) {
1223 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1228 * Clear the zoom rectangle (and perform no zoom).
1231 Dygraph
.prototype.clearZoomRect_
= function() {
1232 this.currentZoomRectArgs_
= null;
1233 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1237 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1238 * the canvas. The exact zoom window may be slightly larger if there are no data
1239 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1240 * which accepts dates that match the raw data. This function redraws the graph.
1242 * @param {Number} lowX The leftmost pixel value that should be visible.
1243 * @param {Number} highX The rightmost pixel value that should be visible.
1246 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1247 this.currentZoomRectArgs_
= null;
1248 // Find the earliest and latest dates contained in this canvasx range.
1249 // Convert the call to date ranges of the raw data.
1250 var minDate
= this.toDataXCoord(lowX
);
1251 var maxDate
= this.toDataXCoord(highX
);
1252 this.doZoomXDates_(minDate
, maxDate
);
1256 * Transition function to use in animations. Returns values between 0.0
1257 * (totally old values) and 1.0 (totally new values) for each frame.
1260 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1262 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1266 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1267 * method with doZoomX which accepts pixel coordinates. This function redraws
1270 * @param {Number} minDate The minimum date that should be visible.
1271 * @param {Number} maxDate The maximum date that should be visible.
1274 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1275 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1276 // can produce strange effects. Rather than the y-axis transitioning slowly
1277 // between values, it can jerk around.)
1278 var old_window
= this.xAxisRange();
1279 var new_window
= [minDate
, maxDate
];
1280 this.zoomed_x_
= true;
1282 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1283 if (that
.attr_("zoomCallback")) {
1284 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1290 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1291 * the canvas. This function redraws the graph.
1293 * @param {Number} lowY The topmost pixel value that should be visible.
1294 * @param {Number} highY The lowest pixel value that should be visible.
1297 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1298 this.currentZoomRectArgs_
= null;
1299 // Find the highest and lowest values in pixel range for each axis.
1300 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1301 // This is because pixels increase as you go down on the screen, whereas data
1302 // coordinates increase as you go up the screen.
1303 var oldValueRanges
= this.yAxisRanges();
1304 var newValueRanges
= [];
1305 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1306 var hi
= this.toDataYCoord(lowY
, i
);
1307 var low
= this.toDataYCoord(highY
, i
);
1308 newValueRanges
.push([low
, hi
]);
1311 this.zoomed_y_
= true;
1313 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1314 if (that
.attr_("zoomCallback")) {
1315 var xRange
= that
.xAxisRange();
1316 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1322 * Reset the zoom to the original view coordinates. This is the same as
1323 * double-clicking on the graph.
1327 Dygraph
.prototype.doUnzoom_
= function() {
1328 var dirty
= false, dirtyX
= false, dirtyY
= false;
1329 if (this.dateWindow_
!== null) {
1334 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1335 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1341 // Clear any selection, since it's likely to be drawn in the wrong place.
1342 this.clearSelection();
1345 this.zoomed_x_
= false;
1346 this.zoomed_y_
= false;
1348 var minDate
= this.rawData_
[0][0];
1349 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1351 // With only one frame, don't bother calculating extreme ranges.
1352 // TODO(danvk): merge this block w/ the code below
.
1353 if (!this.attr_("animatedZooms")) {
1354 this.dateWindow_
= null;
1355 for (i
= 0; i
< this.axes_
.length
; i
++) {
1356 if (this.axes_
[i
].valueWindow
!== null) {
1357 delete this.axes_
[i
].valueWindow
;
1361 if (this.attr_("zoomCallback")) {
1362 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1367 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1369 oldWindow
= this.xAxisRange();
1370 newWindow
= [minDate
, maxDate
];
1374 oldValueRanges
= this.yAxisRanges();
1375 // TODO(danvk): this is pretty inefficient
1376 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1377 var extremes
= packed
[1];
1379 // this has the side-effect of modifying this.axes_.
1380 // this doesn't make much sense in this context, but it's convenient (we
1381 // need this.axes_[*].extremeValues) and not harmful since we'll be
1382 // calling drawGraph_ shortly, which clobbers these values.
1383 this.computeYAxisRanges_(extremes
);
1385 newValueRanges
= [];
1386 for (i
= 0; i
< this.axes_
.length
; i
++) {
1387 var axis
= this.axes_
[i
];
1388 newValueRanges
.push(axis
.valueRange
!= null ? axis
.valueRange
: axis
.extremeRange
);
1393 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1395 that
.dateWindow_
= null;
1396 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1397 if (that
.axes_
[i
].valueWindow
!== null) {
1398 delete that
.axes_
[i
].valueWindow
;
1401 if (that
.attr_("zoomCallback")) {
1402 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1409 * Combined animation logic for all zoom functions.
1410 * either the x parameters or y parameters may be null.
1413 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1414 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1417 var valueRanges
= [];
1420 if (oldXRange
!== null && newXRange
!== null) {
1421 for (step
= 1; step
<= steps
; step
++) {
1422 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1423 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1424 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1428 if (oldYRanges
!== null && newYRanges
!== null) {
1429 for (step
= 1; step
<= steps
; step
++) {
1430 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1432 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1433 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1434 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1436 valueRanges
[step
-1] = thisRange
;
1441 Dygraph
.repeatAndCleanup(function(step
) {
1442 if (valueRanges
.length
) {
1443 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1444 var w
= valueRanges
[step
][i
];
1445 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1448 if (windows
.length
) {
1449 that
.dateWindow_
= windows
[step
];
1452 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1456 * When the mouse moves in the canvas, display information about a nearby data
1457 * point and draw dots over those points in the data series. This function
1458 * takes care of cleanup of previously-drawn dots.
1459 * @param {Object} event The mousemove event from the browser.
1462 Dygraph
.prototype.mouseMove_
= function(event
) {
1463 // This prevents JS errors when mousing over the canvas before data loads.
1464 var points
= this.layout_
.points
;
1465 if (points
=== undefined
) return;
1467 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1472 // Loop through all the points and find the date nearest to our current
1474 var minDist
= 1e+100;
1476 for (i
= 0; i
< points
.length
; i
++) {
1477 var point
= points
[i
];
1478 if (point
=== null) continue;
1479 var dist
= Math
.abs(point
.canvasx
- canvasx
);
1480 if (dist
> minDist
) continue;
1484 if (idx
>= 0) lastx
= points
[idx
].xval
;
1486 // Extract the points we've selected
1487 this.selPoints_
= [];
1488 var l
= points
.length
;
1489 if (!this.attr_("stackedGraph")) {
1490 for (i
= 0; i
< l
; i
++) {
1491 if (points
[i
].xval
== lastx
) {
1492 this.selPoints_
.push(points
[i
]);
1496 // Need to 'unstack' points starting from the bottom
1497 var cumulative_sum
= 0;
1498 for (i
= l
- 1; i
>= 0; i
--) {
1499 if (points
[i
].xval
== lastx
) {
1500 var p
= {}; // Clone the point since we modify it
1501 for (var k
in points
[i
]) {
1502 p
[k
] = points
[i
][k
];
1504 p
.yval
-= cumulative_sum
;
1505 cumulative_sum
+= p
.yval
;
1506 this.selPoints_
.push(p
);
1509 this.selPoints_
.reverse();
1512 if (this.attr_("highlightCallback")) {
1513 var px
= this.lastx_
;
1514 if (px
!== null && lastx
!= px
) {
1515 // only fire if the selected point has changed.
1516 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
, this.idxToRow_(idx
));
1520 // Save last x position for callbacks.
1521 this.lastx_
= lastx
;
1523 this.updateSelection_();
1527 * Transforms layout_.points index into data row number.
1528 * @param int layout_.points index
1529 * @return int row number, or -1 if none could be found.
1532 Dygraph
.prototype.idxToRow_
= function(idx
) {
1533 if (idx
< 0) return -1;
1535 // make sure that you get the boundaryIds record which is also defined (see bug #236)
1536 var boundaryIdx
= -1;
1537 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1538 if (this.boundaryIds_
[i
] !== undefined
) {
1543 if (boundaryIdx
< 0) return -1;
1544 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1545 var set
= this.layout_
.datasets
[setIdx
];
1546 if (idx
< set
.length
) {
1547 return this.boundaryIds_
[boundaryIdx
][0] + idx
;
1556 * Generates legend html dash for any stroke pattern. It will try to scale the
1557 * pattern to fit in 1em width. Or if small enough repeat the partern for 1em
1559 * @param strokePattern The pattern
1560 * @param color The color of the series.
1561 * @param oneEmWidth The width in pixels of 1em in the legend.
1563 Dygraph
.prototype.generateLegendDashHTML_
= function(strokePattern
, color
, oneEmWidth
) {
1565 var i
, j
, paddingLeft
, marginRight
;
1566 var strokePixelLength
= 0, segmentLoop
= 0;
1567 var normalizedPattern
= [];
1569 // IE 7,8 fail at these divs, so they get boring legend, have not tested 9.
1570 var isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
1574 if (!strokePattern
|| strokePattern
.length
<= 1) {
1576 dash
= "<div style=\"display: inline-block; position: relative; " +
1577 "bottom: .5ex; padding-left: 1em; height: 1px; " +
1578 "border-bottom: 2px solid " + color
+ ";\"></div>";
1580 // Compute the length of the pixels including the first segment twice,
1581 // since we repeat it.
1582 for (i
= 0; i
<= strokePattern
.length
; i
++) {
1583 strokePixelLength
+= strokePattern
[i
%strokePattern
.length
];
1586 // See if we can loop the pattern by itself at least twice.
1587 loop
= Math
.floor(oneEmWidth
/(strokePixelLength
-strokePattern
[0]));
1589 // This pattern fits at least two times, no scaling just convert to em;
1590 for (i
= 0; i
< strokePattern
.length
; i
++) {
1591 normalizedPattern
[i
] = strokePattern
[i
]/oneEmWidth
;
1593 // Since we are repeating the pattern, we don't worry about repeating the
1594 // first segment in one draw.
1595 segmentLoop
= normalizedPattern
.length
;
1597 // If the pattern doesn't fit in the legend we scale it to fit.
1599 for (i
= 0; i
< strokePattern
.length
; i
++) {
1600 normalizedPattern
[i
] = strokePattern
[i
]/strokePixelLength
;
1602 // For the scaled patterns we do redraw the first segment.
1603 segmentLoop
= normalizedPattern
.length
+1;
1605 // Now make the pattern.
1606 for (j
= 0; j
< loop
; j
++) {
1607 for (i
= 0; i
< segmentLoop
; i
+=2) {
1608 // The padding is the drawn segment.
1609 paddingLeft
= normalizedPattern
[i
%normalizedPattern
.length
];
1610 if (i
< strokePattern
.length
) {
1611 // The margin is the space segment.
1612 marginRight
= normalizedPattern
[(i
+1)%normalizedPattern
.length
];
1614 // The repeated first segment has no right margin.
1617 dash
+= "<div style=\"display: inline-block; position: relative; " +
1618 "bottom: .5ex; margin-right: " + marginRight
+ "em; padding-left: " +
1619 paddingLeft
+ "em; height: 1px; border-bottom: 2px solid " + color
+
1629 * Generates HTML for the legend which is displayed when hovering over the
1630 * chart. If no selected points are specified, a default legend is returned
1631 * (this may just be the empty string).
1632 * @param { Number } [x] The x-value of the selected points.
1633 * @param { [Object] } [sel_points] List of selected points for the given
1634 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1635 * @param { Number } [oneEmWidth] The pixel width for 1em in the legend.
1637 Dygraph
.prototype.generateLegendHTML_
= function(x
, sel_points
, oneEmWidth
) {
1638 // If no points are selected, we display a default legend. Traditionally,
1639 // this has been blank. But a better default would be a conventional legend,
1640 // which provides essential information for a non-interactive chart.
1641 var html
, sepLines
, i
, c
, dash
, strokePattern
;
1642 if (typeof(x
) === 'undefined') {
1643 if (this.attr_('legend') != 'always') return '';
1645 sepLines
= this.attr_('labelsSeparateLines');
1646 var labels
= this.attr_('labels');
1648 for (i
= 1; i
< labels
.length
; i
++) {
1649 if (!this.visibility()[i
- 1]) continue;
1650 c
= this.plotter_
.colors
[labels
[i
]];
1651 if (html
!== '') html
+= (sepLines
? '<br/>' : ' ');
1652 strokePattern
= this.attr_("strokePattern", labels
[i
]);
1653 dash
= this.generateLegendDashHTML_(strokePattern
, c
, oneEmWidth
);
1654 html
+= "<span style='font-weight: bold; color: " + c
+ ";'>" + dash
+
1655 " " + labels
[i
] + "</span>";
1660 var xOptView
= this.optionsViewForAxis_('x');
1661 var xvf
= xOptView('valueFormatter');
1662 html
= xvf(x
, xOptView
, this.attr_('labels')[0], this) + ":";
1665 var num_axes
= this.numAxes();
1666 for (i
= 0; i
< num_axes
; i
++) {
1667 yOptViews
[i
] = this.optionsViewForAxis_('y' + (i
? 1 + i
: ''));
1669 var showZeros
= this.attr_("labelsShowZeroValues");
1670 sepLines
= this.attr_("labelsSeparateLines");
1671 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1672 var pt
= this.selPoints_
[i
];
1673 if (pt
.yval
=== 0 && !showZeros
) continue;
1674 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1675 if (sepLines
) html
+= "<br/>";
1677 var yOptView
= yOptViews
[this.seriesToAxisMap_
[pt
.name
]];
1678 var fmtFunc
= yOptView('valueFormatter');
1679 c
= this.plotter_
.colors
[pt
.name
];
1680 var yval
= fmtFunc(pt
.yval
, yOptView
, pt
.name
, this);
1682 // TODO(danvk): use a template string here and make it an attribute.
1683 html
+= " <b><span style='color: " + c
+ ";'>" + pt
.name
+
1684 "</span></b>:" + yval
;
1691 * Displays information about the selected points in the legend. If there is no
1692 * selection, the legend will be cleared.
1693 * @param { Number } [x] The x-value of the selected points.
1694 * @param { [Object] } [sel_points] List of selected points for the given
1695 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1697 Dygraph
.prototype.setLegendHTML_
= function(x
, sel_points
) {
1698 var labelsDiv
= this.attr_("labelsDiv");
1699 var sizeSpan
= document
.createElement('span');
1700 // Calculates the width of 1em in pixels for the legend.
1701 sizeSpan
.setAttribute('style', 'margin: 0; padding: 0 0 0 1em; border: 0;');
1702 labelsDiv
.appendChild(sizeSpan
);
1703 var oneEmWidth
=sizeSpan
.offsetWidth
;
1705 var html
= this.generateLegendHTML_(x
, sel_points
, oneEmWidth
);
1706 if (labelsDiv
!== null) {
1707 labelsDiv
.innerHTML
= html
;
1709 if (typeof(this.shown_legend_error_
) == 'undefined') {
1710 this.error('labelsDiv is set to something nonexistent; legend will not be shown.');
1711 this.shown_legend_error_
= true;
1717 * Draw dots over the selectied points in the data series. This function
1718 * takes care of cleanup of previously-drawn dots.
1721 Dygraph
.prototype.updateSelection_
= function() {
1722 // Clear the previously drawn vertical, if there is one
1724 var ctx
= this.canvas_ctx_
;
1725 if (this.previousVerticalX_
>= 0) {
1726 // Determine the maximum highlight circle size.
1727 var maxCircleSize
= 0;
1728 var labels
= this.attr_('labels');
1729 for (i
= 1; i
< labels
.length
; i
++) {
1730 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1731 if (r
> maxCircleSize
) maxCircleSize
= r
;
1733 var px
= this.previousVerticalX_
;
1734 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1735 2 * maxCircleSize
+ 2, this.height_
);
1738 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1739 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1742 if (this.selPoints_
.length
> 0) {
1743 // Set the status message to indicate the selected point(s)
1744 if (this.attr_('showLabelsOnHighlight')) {
1745 this.setLegendHTML_(this.lastx_
, this.selPoints_
);
1748 // Draw colored circles over the center of each selected point
1749 var canvasx
= this.selPoints_
[0].canvasx
;
1751 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1752 var pt
= this.selPoints_
[i
];
1753 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1755 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1756 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1758 callback
= Dygraph
.Circles
.DEFAULT
;
1760 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1761 this.plotter_
.colors
[pt
.name
], circleSize
);
1765 this.previousVerticalX_
= canvasx
;
1770 * Manually set the selected points and display information about them in the
1771 * legend. The selection can be cleared using clearSelection() and queried
1772 * using getSelection().
1773 * @param { Integer } row number that should be highlighted (i.e. appear with
1774 * hover dots on the chart). Set to false to clear any selection.
1776 Dygraph
.prototype.setSelection
= function(row
) {
1777 // Extract the points we've selected
1778 this.selPoints_
= [];
1781 if (row
!== false) {
1782 row
= row
- this.boundaryIds_
[0][0];
1785 if (row
!== false && row
>= 0) {
1786 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1787 var set
= this.layout_
.datasets
[setIdx
];
1788 if (row
< set
.length
) {
1789 var point
= this.layout_
.points
[pos
+row
];
1791 if (this.attr_("stackedGraph")) {
1792 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1795 this.selPoints_
.push(point
);
1801 if (this.selPoints_
.length
) {
1802 this.lastx_
= this.selPoints_
[0].xval
;
1803 this.updateSelection_();
1805 this.clearSelection();
1811 * The mouse has left the canvas. Clear out whatever artifacts remain
1812 * @param {Object} event the mouseout event from the browser.
1815 Dygraph
.prototype.mouseOut_
= function(event
) {
1816 if (this.attr_("unhighlightCallback")) {
1817 this.attr_("unhighlightCallback")(event
);
1820 if (this.attr_("hideOverlayOnMouseOut")) {
1821 this.clearSelection();
1826 * Clears the current selection (i.e. points that were highlighted by moving
1827 * the mouse over the chart).
1829 Dygraph
.prototype.clearSelection
= function() {
1830 // Get rid of the overlay data
1831 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
1832 this.setLegendHTML_();
1833 this.selPoints_
= [];
1838 * Returns the number of the currently selected row. To get data for this row,
1839 * you can use the getValue method.
1840 * @return { Integer } row number, or -1 if nothing is selected
1842 Dygraph
.prototype.getSelection
= function() {
1843 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1847 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1848 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1849 return row
+ this.boundaryIds_
[0][0];
1856 * Fires when there's data available to be graphed.
1857 * @param {String} data Raw CSV data to be plotted
1860 Dygraph
.prototype.loadedEvent_
= function(data
) {
1861 this.rawData_
= this.parseCSV_(data
);
1866 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1869 Dygraph
.prototype.addXTicks_
= function() {
1870 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1872 if (this.dateWindow_
) {
1873 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
1875 range
= this.fullXRange_();
1878 var xAxisOptionsView
= this.optionsViewForAxis_('x');
1879 var xTicks
= xAxisOptionsView('ticker')(
1882 this.width_
, // TODO(danvk): should be area.width
1885 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
1886 // console.log(msg);
1887 this.layout_
.setXTicks(xTicks
);
1892 * Computes the range of the data series (including confidence intervals).
1893 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
1894 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1895 * @return [low, high]
1897 Dygraph
.prototype.extremeValues_
= function(series
) {
1898 var minY
= null, maxY
= null, j
, y
;
1900 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1902 // With custom bars, maxY is the max of the high values.
1903 for (j
= 0; j
< series
.length
; j
++) {
1904 y
= series
[j
][1][0];
1906 var low
= y
- series
[j
][1][1];
1907 var high
= y
+ series
[j
][1][2];
1908 if (low
> y
) low
= y
; // this can happen with custom bars,
1909 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1910 if (maxY
=== null || high
> maxY
) {
1913 if (minY
=== null || low
< minY
) {
1918 for (j
= 0; j
< series
.length
; j
++) {
1920 if (y
=== null || isNaN(y
)) continue;
1921 if (maxY
=== null || y
> maxY
) {
1924 if (minY
=== null || y
< minY
) {
1930 return [minY
, maxY
];
1935 * This function is called once when the chart's data is changed or the options
1936 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1937 * idea is that values derived from the chart's data can be computed here,
1938 * rather than every time the chart is drawn. This includes things like the
1939 * number of axes, rolling averages, etc.
1941 Dygraph
.prototype.predraw_
= function() {
1942 var start
= new Date();
1944 // TODO(danvk): move more computations out of drawGraph_ and into here.
1945 this.computeYAxes_();
1947 // Create a new plotter.
1948 if (this.plotter_
) this.plotter_
.clear();
1949 this.plotter_
= new DygraphCanvasRenderer(this,
1954 // The roller sits in the bottom left corner of the chart. We don't know where
1955 // this will be until the options are available, so it's positioned here.
1956 this.createRollInterface_();
1958 // Same thing applies for the labelsDiv. It's right edge should be flush with
1959 // the right edge of the charting area (which may not be the same as the right
1960 // edge of the div, if we have two y-axes.
1961 this.positionLabelsDiv_();
1963 if (this.rangeSelector_
) {
1964 this.rangeSelector_
.renderStaticLayer();
1967 // Convert the raw data (a 2D array) into the internal format and compute
1968 // rolling averages.
1969 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
1970 for (var i
= 1; i
< this.numColumns(); i
++) {
1971 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
1972 var logScale
= this.attr_('logscale', i
);
1973 var series
= this.extractSeries_(this.rawData_
, i
, logScale
, connectSeparatedPoints
);
1974 series
= this.rollingAverage(series
, this.rollPeriod_
);
1975 this.rolledSeries_
.push(series
);
1978 // If the data or options have changed, then we'd better redraw.
1981 // This is used to determine whether to do various animations.
1982 var end
= new Date();
1983 this.drawingTimeMs_
= (end
- start
);
1987 * Loop over all fields and create datasets, calculating extreme y-values for
1988 * each series and extreme x-indices as we go.
1990 * dateWindow is passed in as an explicit parameter so that we can compute
1991 * extreme values "speculatively", i.e. without actually setting state on the
1994 * TODO(danvk): make this more of a true function
1995 * @return [ datasets, seriesExtremes, boundaryIds ]
1998 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
1999 var boundaryIds
= [];
2000 var cumulative_y
= []; // For stacked series.
2002 var extremes
= {}; // series name -> [low, high]
2005 // Loop over the fields (series). Go from the last to the first,
2006 // because if they're stacked that's how we accumulate the values.
2007 var num_series
= rolledSeries
.length
- 1;
2008 for (i
= num_series
; i
>= 1; i
--) {
2009 if (!this.visibility()[i
- 1]) continue;
2011 // TODO(danvk): is this copy really necessary?
2013 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2014 series
.push(rolledSeries
[i
][j
]);
2017 // Prune down to the desired range, if necessary (for zooming)
2018 // Because there can be lines going to points outside of the visible area,
2019 // we actually prune to visible points, plus one on either side.
2020 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2022 var low
= dateWindow
[0];
2023 var high
= dateWindow
[1];
2025 // TODO(danvk): do binary search instead of linear search.
2026 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2027 var firstIdx
= null, lastIdx
= null;
2028 for (k
= 0; k
< series
.length
; k
++) {
2029 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2032 if (series
[k
][0] <= high
) {
2036 if (firstIdx
=== null) firstIdx
= 0;
2037 if (firstIdx
> 0) firstIdx
--;
2038 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2039 if (lastIdx
< series
.length
- 1) lastIdx
++;
2040 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2041 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2042 pruned
.push(series
[k
]);
2046 boundaryIds
[i
-1] = [0, series
.length
-1];
2049 var seriesExtremes
= this.extremeValues_(series
);
2052 for (j
=0; j
<series
.length
; j
++) {
2053 series
[j
] = [series
[j
][0],
2058 } else if (this.attr_("stackedGraph")) {
2059 var l
= series
.length
;
2061 for (j
= 0; j
< l
; j
++) {
2062 // If one data set has a NaN, let all subsequent stacked
2063 // sets inherit the NaN -- only start at 0 for the first set.
2064 var x
= series
[j
][0];
2065 if (cumulative_y
[x
] === undefined
) {
2066 cumulative_y
[x
] = 0;
2069 actual_y
= series
[j
][1];
2070 cumulative_y
[x
] += actual_y
;
2072 series
[j
] = [x
, cumulative_y
[x
]];
2074 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2075 seriesExtremes
[1] = cumulative_y
[x
];
2077 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2078 seriesExtremes
[0] = cumulative_y
[x
];
2083 var seriesName
= this.attr_("labels")[i
];
2084 extremes
[seriesName
] = seriesExtremes
;
2085 datasets
[i
] = series
;
2088 return [ datasets
, extremes
, boundaryIds
];
2092 * Update the graph with new data. This method is called when the viewing area
2093 * has changed. If the underlying data or options have changed, predraw_ will
2094 * be called before drawGraph_ is called.
2096 * clearSelection, when undefined or true, causes this.clearSelection to be
2097 * called at the end of the draw operation. This should rarely be defined,
2098 * and never true (that is it should be undefined most of the time, and
2103 Dygraph
.prototype.drawGraph_
= function(clearSelection
) {
2104 var start
= new Date();
2106 if (typeof(clearSelection
) === 'undefined') {
2107 clearSelection
= true;
2110 // This is used to set the second parameter to drawCallback, below.
2111 var is_initial_draw
= this.is_initial_draw_
;
2112 this.is_initial_draw_
= false;
2114 this.layout_
.removeAllDatasets();
2116 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2118 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2119 var datasets
= packed
[0];
2120 var extremes
= packed
[1];
2121 this.boundaryIds_
= packed
[2];
2123 this.setIndexByName_
= {};
2124 var labels
= this.attr_("labels");
2125 if (labels
.length
> 0) {
2126 this.setIndexByName_
[labels
[0]] = 0;
2128 for (var i
= 1; i
< datasets
.length
; i
++) {
2129 this.setIndexByName_
[labels
[i
]] = i
;
2130 if (!this.visibility()[i
- 1]) continue;
2131 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2134 this.computeYAxisRanges_(extremes
);
2135 this.layout_
.setYAxes(this.axes_
);
2139 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2140 var tmp_zoomed_x
= this.zoomed_x_
;
2141 // Tell PlotKit to use this new data and render itself
2142 this.layout_
.setDateWindow(this.dateWindow_
);
2143 this.zoomed_x_
= tmp_zoomed_x
;
2144 this.layout_
.evaluateWithError();
2145 this.renderGraph_(is_initial_draw
, false);
2147 if (this.attr_("timingName")) {
2148 var end
= new Date();
2150 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2155 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
, clearSelection
) {
2156 this.plotter_
.clear();
2157 this.plotter_
.render();
2158 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2159 this.canvas_
.height
);
2161 // Generate a static legend before any particular point is selected.
2162 this.setLegendHTML_();
2164 if (!is_initial_draw
) {
2165 if (clearSelection
) {
2166 if (typeof(this.selPoints_
) !== 'undefined' && this.selPoints_
.length
) {
2167 // We should select the point nearest the page x/y here
, but it
's easier
2168 // to just clear the selection. This prevents erroneous hover dots from
2170 this.clearSelection();
2172 this.clearSelection();
2177 if (this.rangeSelector_) {
2178 this.rangeSelector_.renderInteractiveLayer();
2181 if (this.attr_("drawCallback") !== null) {
2182 this.attr_("drawCallback")(this, is_initial_draw);
2188 * Determine properties of the y-axes which are independent of the data
2189 * currently being displayed. This includes things like the number of axes and
2190 * the style of the axes. It does not include the range of each axis and its
2192 * This fills in this.axes_ and this.seriesToAxisMap_.
2193 * axes_ = [ { options } ]
2194 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2195 * indices are into the axes_ array.
2197 Dygraph.prototype.computeYAxes_ = function() {
2198 // Preserve valueWindow settings if they exist, and if the user hasn't
2199 // specified a new valueRange.
2200 var i
, valueWindows
, seriesName
, axis
, index
, opts
, v
;
2201 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2203 for (index
= 0; index
< this.axes_
.length
; index
++) {
2204 valueWindows
.push(this.axes_
[index
].valueWindow
);
2208 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2209 this.seriesToAxisMap_
= {};
2211 // Get a list of series names.
2212 var labels
= this.attr_("labels");
2214 for (i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2216 // all options which could be applied per-axis:
2224 'axisLabelFontSize',
2229 // Copy global axis options over to the first axis.
2230 for (i
= 0; i
< axisOptions
.length
; i
++) {
2231 var k
= axisOptions
[i
];
2233 if (v
) this.axes_
[0][k
] = v
;
2236 // Go through once and add all the axes.
2237 for (seriesName
in series
) {
2238 if (!series
.hasOwnProperty(seriesName
)) continue;
2239 axis
= this.attr_("axis", seriesName
);
2240 if (axis
=== null) {
2241 this.seriesToAxisMap_
[seriesName
] = 0;
2244 if (typeof(axis
) == 'object') {
2245 // Add a new axis, making a copy of its per-axis options.
2247 Dygraph
.update(opts
, this.axes_
[0]);
2248 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2249 var yAxisId
= this.axes_
.length
;
2250 opts
.yAxisId
= yAxisId
;
2252 Dygraph
.update(opts
, axis
);
2253 this.axes_
.push(opts
);
2254 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2258 // Go through one more time and assign series to an axis defined by another
2259 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2260 for (seriesName
in series
) {
2261 if (!series
.hasOwnProperty(seriesName
)) continue;
2262 axis
= this.attr_("axis", seriesName
);
2263 if (typeof(axis
) == 'string') {
2264 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2265 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2266 "series " + axis
+ ", which does not define its own axis.");
2269 var idx
= this.seriesToAxisMap_
[axis
];
2270 this.seriesToAxisMap_
[seriesName
] = idx
;
2274 if (valueWindows
!== undefined
) {
2275 // Restore valueWindow settings.
2276 for (index
= 0; index
< valueWindows
.length
; index
++) {
2277 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2282 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2284 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2285 v
= opts("valueRange");
2286 if (v
) this.axes_
[axis
].valueRange
= v
;
2287 } else { // To keep old behavior
2288 var axes
= this.user_attrs_
.axes
;
2289 if (axes
&& axes
.y2
) {
2290 v
= axes
.y2
.valueRange
;
2291 if (v
) this.axes_
[axis
].valueRange
= v
;
2299 * Returns the number of y-axes on the chart.
2300 * @return {Number} the number of axes.
2302 Dygraph
.prototype.numAxes
= function() {
2304 for (var series
in this.seriesToAxisMap_
) {
2305 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2306 var idx
= this.seriesToAxisMap_
[series
];
2307 if (idx
> last_axis
) last_axis
= idx
;
2309 return 1 + last_axis
;
2314 * Returns axis properties for the given series.
2315 * @param { String } setName The name of the series for which to get axis
2316 * properties, e.g. 'Y1'.
2317 * @return { Object } The axis properties.
2319 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2320 // TODO(danvk): handle errors.
2321 return this.axes_
[this.seriesToAxisMap_
[series
]];
2326 * Determine the value range and tick marks for each axis.
2327 * @param {Object} extremes A mapping from seriesName -> [low, high]
2328 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2330 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2331 // Build a map from axis number -> [list of series names]
2332 var seriesForAxis
= [], series
;
2333 for (series
in this.seriesToAxisMap_
) {
2334 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2335 var idx
= this.seriesToAxisMap_
[series
];
2336 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2337 seriesForAxis
[idx
].push(series
);
2340 // Compute extreme values, a span and tick marks for each axis.
2341 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2342 var axis
= this.axes_
[i
];
2344 if (!seriesForAxis
[i
]) {
2345 // If no series are defined or visible then use a reasonable default
2346 axis
.extremeRange
= [0, 1];
2348 // Calculate the extremes of extremes.
2349 series
= seriesForAxis
[i
];
2350 var minY
= Infinity
; // extremes[series[0]][0];
2351 var maxY
= -Infinity
; // extremes[series[0]][1];
2352 var extremeMinY
, extremeMaxY
;
2354 for (var j
= 0; j
< series
.length
; j
++) {
2355 // this skips invisible series
2356 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2358 // Only use valid extremes to stop null data series' from corrupting the scale.
2359 extremeMinY
= extremes
[series
[j
]][0];
2360 if (extremeMinY
!== null) {
2361 minY
= Math
.min(extremeMinY
, minY
);
2363 extremeMaxY
= extremes
[series
[j
]][1];
2364 if (extremeMaxY
!== null) {
2365 maxY
= Math
.max(extremeMaxY
, maxY
);
2368 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2370 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2371 if (minY
== Infinity
) minY
= 0;
2372 if (maxY
== -Infinity
) maxY
= 1;
2374 // Add some padding and round up to an integer to be human-friendly.
2375 var span
= maxY
- minY
;
2376 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2377 if (span
=== 0) { span
= maxY
; }
2379 var maxAxisY
, minAxisY
;
2380 if (axis
.logscale
) {
2381 maxAxisY
= maxY
+ 0.1 * span
;
2384 maxAxisY
= maxY
+ 0.1 * span
;
2385 minAxisY
= minY
- 0.1 * span
;
2387 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2388 if (!this.attr_("avoidMinZero")) {
2389 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2390 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2393 if (this.attr_("includeZero")) {
2394 if (maxY
< 0) maxAxisY
= 0;
2395 if (minY
> 0) minAxisY
= 0;
2398 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2400 if (axis
.valueWindow
) {
2401 // This is only set if the user has zoomed on the y-axis. It is never set
2402 // by a user. It takes precedence over axis.valueRange because, if you set
2403 // valueRange, you'd still expect to be able to pan.
2404 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2405 } else if (axis
.valueRange
) {
2406 // This is a user-set value range for this axis.
2407 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2409 axis
.computedValueRange
= axis
.extremeRange
;
2412 // Add ticks. By default, all axes inherit the tick positions of the
2413 // primary axis. However, if an axis is specifically marked as having
2414 // independent ticks, then that is permissible as well.
2415 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2416 var ticker
= opts('ticker');
2417 if (i
=== 0 || axis
.independentTicks
) {
2418 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2419 axis
.computedValueRange
[1],
2420 this.height_
, // TODO(danvk): should be area.height
2424 var p_axis
= this.axes_
[0];
2425 var p_ticks
= p_axis
.ticks
;
2426 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2427 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2428 var tick_values
= [];
2429 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2430 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2431 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2432 tick_values
.push(y_val
);
2435 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2436 axis
.computedValueRange
[1],
2437 this.height_
, // TODO(danvk): should be area.height
2446 * Extracts one series from the raw data (a 2D array) into an array of (date,
2449 * This is where undesirable points (i.e. negative values on log scales and
2450 * missing values through which we wish to connect lines) are dropped.
2454 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
, connectSeparatedPoints
) {
2456 for (var j
= 0; j
< rawData
.length
; j
++) {
2457 var x
= rawData
[j
][0];
2458 var point
= rawData
[j
][i
];
2460 // On the log scale, points less than zero do not exist.
2461 // This will create a gap in the chart. Note that this ignores
2462 // connectSeparatedPoints.
2466 series
.push([x
, point
]);
2468 if (point
!== null || !connectSeparatedPoints
) {
2469 series
.push([x
, point
]);
2478 * Calculates the rolling average of a data set.
2479 * If originalData is [label, val], rolls the average of those.
2480 * If originalData is [label, [, it's interpreted as [value, stddev]
2481 * and the roll is returned in the same form, with appropriately reduced
2482 * stddev for each value.
2483 * Note that this is where fractional input (i.e. '5/10') is converted into
2485 * @param {Array} originalData The data in the appropriate format (see above)
2486 * @param {Number} rollPeriod The number of points over which to average the
2489 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2490 if (originalData
.length
< 2)
2491 return originalData
;
2492 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2493 var rollingData
= [];
2494 var sigma
= this.attr_("sigma");
2496 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2497 if (this.fractions_
) {
2499 var den
= 0; // numerator/denominator
2501 for (i
= 0; i
< originalData
.length
; i
++) {
2502 num
+= originalData
[i
][1][0];
2503 den
+= originalData
[i
][1][1];
2504 if (i
- rollPeriod
>= 0) {
2505 num
-= originalData
[i
- rollPeriod
][1][0];
2506 den
-= originalData
[i
- rollPeriod
][1][1];
2509 var date
= originalData
[i
][0];
2510 var value
= den
? num
/ den
: 0.0;
2511 if (this.attr_("errorBars")) {
2512 if (this.attr_("wilsonInterval")) {
2513 // For more details on this confidence interval, see:
2514 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2516 var p
= value
< 0 ? 0 : value
, n
= den
;
2517 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2518 var denom
= 1 + sigma
* sigma
/ den
;
2519 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2520 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2521 rollingData
[i
] = [date
,
2522 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2524 rollingData
[i
] = [date
, [0, 0, 0]];
2527 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2528 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2531 rollingData
[i
] = [date
, mult
* value
];
2534 } else if (this.attr_("customBars")) {
2539 for (i
= 0; i
< originalData
.length
; i
++) {
2540 var data
= originalData
[i
][1];
2542 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2544 if (y
!== null && !isNaN(y
)) {
2550 if (i
- rollPeriod
>= 0) {
2551 var prev
= originalData
[i
- rollPeriod
];
2552 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2560 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2561 1.0 * (mid
- low
) / count
,
2562 1.0 * (high
- mid
) / count
]];
2564 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2568 // Calculate the rolling average for the first rollPeriod - 1 points where
2569 // there is not enough data to roll over the full number of points
2570 if (!this.attr_("errorBars")){
2571 if (rollPeriod
== 1) {
2572 return originalData
;
2575 for (i
= 0; i
< originalData
.length
; i
++) {
2578 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2579 y
= originalData
[j
][1];
2580 if (y
=== null || isNaN(y
)) continue;
2582 sum
+= originalData
[j
][1];
2585 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2587 rollingData
[i
] = [originalData
[i
][0], null];
2592 for (i
= 0; i
< originalData
.length
; i
++) {
2596 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2597 y
= originalData
[j
][1][0];
2598 if (y
=== null || isNaN(y
)) continue;
2600 sum
+= originalData
[j
][1][0];
2601 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2604 stddev
= Math
.sqrt(variance
) / num_ok
;
2605 rollingData
[i
] = [originalData
[i
][0],
2606 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2608 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2618 * Detects the type of the str (date or numeric) and sets the various
2619 * formatting attributes in this.attrs_ based on this type.
2620 * @param {String} str An x value.
2623 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2625 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2626 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2627 str
.indexOf('/') >= 0 ||
2628 isNaN(parseFloat(str
))) {
2630 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2631 // TODO(danvk): remove support for this format.
2636 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2637 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2638 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2639 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2641 /** @private (shut up, jsdoc!) */
2642 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2643 // TODO(danvk): use Dygraph.numberValueFormatter here?
2644 /** @private (shut up, jsdoc!) */
2645 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2646 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2647 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2652 * Parses the value as a floating point number. This is like the parseFloat()
2653 * built-in, but with a few differences:
2654 * - the empty string is parsed as null, rather than NaN.
2655 * - if the string cannot be parsed at all, an error is logged.
2656 * If the string can't be parsed, this method returns null.
2657 * @param {String} x The string to be parsed
2658 * @param {Number} opt_line_no The line number from which the string comes.
2659 * @param {String} opt_line The text of the line from which the string comes.
2663 // Parse the x as a float or return null if it's not a number.
2664 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2665 var val
= parseFloat(x
);
2666 if (!isNaN(val
)) return val
;
2668 // Try to figure out what happeend.
2669 // If the value is the empty string, parse it as null.
2670 if (/^ *$/.test(x
)) return null;
2672 // If it was actually "NaN", return it as NaN.
2673 if (/^ *nan *$/i.test(x
)) return NaN
;
2675 // Looks like a parsing error.
2676 var msg
= "Unable to parse '" + x
+ "' as a number";
2677 if (opt_line
!== null && opt_line_no
!== null) {
2678 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2687 * Parses a string in a special csv format. We expect a csv file where each
2688 * line is a date point, and the first field in each line is the date string.
2689 * We also expect that all remaining fields represent series.
2690 * if the errorBars attribute is set, then interpret the fields as:
2691 * date, series1, stddev1, series2, stddev2, ...
2692 * @param {[Object]} data See above.
2694 * @return [Object] An array with one entry for each row. These entries
2695 * are an array of cells in that row. The first entry is the parsed x-value for
2696 * the row. The second, third, etc. are the y-values. These can take on one of
2697 * three forms, depending on the CSV and constructor parameters:
2699 * 2. [ value, stddev ]
2700 * 3. [ low value, center value, high value ]
2702 Dygraph
.prototype.parseCSV_
= function(data
) {
2704 var lines
= data
.split("\n");
2707 // Use the default delimiter or fall back to a tab if that makes sense.
2708 var delim
= this.attr_('delimiter');
2709 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2714 if (!('labels' in this.user_attrs_
)) {
2715 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2717 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2722 var defaultParserSet
= false; // attempt to auto-detect x value type
2723 var expectedCols
= this.attr_("labels").length
;
2724 var outOfOrder
= false;
2725 for (var i
= start
; i
< lines
.length
; i
++) {
2726 var line
= lines
[i
];
2728 if (line
.length
=== 0) continue; // skip blank lines
2729 if (line
[0] == '#') continue; // skip comment lines
2730 var inFields
= line
.split(delim
);
2731 if (inFields
.length
< 2) continue;
2734 if (!defaultParserSet
) {
2735 this.detectTypeFromString_(inFields
[0]);
2736 xParser
= this.attr_("xValueParser");
2737 defaultParserSet
= true;
2739 fields
[0] = xParser(inFields
[0], this);
2741 // If fractions are expected, parse the numbers as "A/B
"
2742 if (this.fractions_) {
2743 for (j = 1; j < inFields.length; j++) {
2744 // TODO(danvk): figure out an appropriate way to flag parse errors.
2745 vals = inFields[j].split("/");
2746 if (vals.length != 2) {
2747 this.error('Expected fractional "num
/den
" values in CSV data ' +
2748 "but found a value
'" + inFields[j] + "' on line
" +
2749 (1 + i) + " ('" + line + "') which is not of
this form
.");
2752 fields[j] = [this.parseFloat_(vals[0], i, line),
2753 this.parseFloat_(vals[1], i, line)];
2756 } else if (this.attr_("errorBars
")) {
2757 // If there are error bars, values are (value, stddev) pairs
2758 if (inFields.length % 2 != 1) {
2759 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2760 'but line ' + (1 + i) + ' has an odd number of values (' +
2761 (inFields.length - 1) + "): '" + line + "'");
2763 for (j = 1; j < inFields.length; j += 2) {
2764 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2765 this.parseFloat_(inFields[j + 1], i, line)];
2767 } else if (this.attr_("customBars
")) {
2768 // Bars are a low;center;high tuple
2769 for (j = 1; j < inFields.length; j++) {
2770 var val = inFields[j];
2771 if (/^ *$/.test(val)) {
2772 fields[j] = [null, null, null];
2774 vals = val.split(";");
2775 if (vals.length == 3) {
2776 fields[j] = [ this.parseFloat_(vals[0], i, line),
2777 this.parseFloat_(vals[1], i, line),
2778 this.parseFloat_(vals[2], i, line) ];
2780 this.warn('When using customBars, values must be either blank ' +
2781 'or "low
;center
;high
" tuples (got "' + val +
2782 '" on line ' + (1+i));
2787 // Values are just numbers
2788 for (j = 1; j < inFields.length; j++) {
2789 fields[j] = this.parseFloat_(inFields[j], i, line);
2792 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2796 if (fields.length != expectedCols) {
2797 this.error("Number of columns
in line
" + i + " (" + fields.length +
2798 ") does not agree
with number of
labels (" + expectedCols +
2802 // If the user specified the 'labels' option and none of the cells of the
2803 // first row parsed correctly, then they probably double-specified the
2804 // labels. We go with the values set in the option, discard this row and
2805 // log a warning to the JS console.
2806 if (i === 0 && this.attr_('labels')) {
2807 var all_null = true;
2808 for (j = 0; all_null && j < fields.length; j++) {
2809 if (fields[j]) all_null = false;
2812 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2813 "CSV
data ('" + line + "') appears to also contain labels
. " +
2814 "Will drop the CSV labels and
use the option labels
.");
2822 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2823 ret.sort(function(a,b) { return a[0] - b[0]; });
2831 * The user has provided their data as a pre-packaged JS array. If the x values
2832 * are numeric, this is the same as dygraphs' internal format. If the x values
2833 * are dates, we need to convert them from Date objects to ms since epoch.
2834 * @param {[Object]} data
2835 * @return {[Object]} data with numeric x values.
2837 Dygraph.prototype.parseArray_ = function(data) {
2838 // Peek at the first x value to see if it's numeric.
2839 if (data.length === 0) {
2840 this.error("Can
't plot empty data set");
2843 if (data[0].length === 0) {
2844 this.error("Data set cannot contain an empty row");
2849 if (this.attr_("labels") === null) {
2850 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2851 "in the options parameter");
2852 this.attrs_.labels = [ "X" ];
2853 for (i = 1; i < data[0].length; i++) {
2854 this.attrs_.labels.push("Y" + i);
2858 if (Dygraph.isDateLike(data[0][0])) {
2859 // Some intelligent defaults for a date x-axis.
2860 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
2861 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
2862 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
2864 // Assume they're all dates
.
2865 var parsedData
= Dygraph
.clone(data
);
2866 for (i
= 0; i
< data
.length
; i
++) {
2867 if (parsedData
[i
].length
=== 0) {
2868 this.error("Row " + (1 + i
) + " of data is empty");
2871 if (parsedData
[i
][0] === null ||
2872 typeof(parsedData
[i
][0].getTime
) != 'function' ||
2873 isNaN(parsedData
[i
][0].getTime())) {
2874 this.error("x value in row " + (1 + i
) + " is not a Date");
2877 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2881 // Some intelligent defaults for a numeric x-axis.
2882 /** @private (shut up, jsdoc!) */
2883 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2884 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
2885 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2891 * Parses a DataTable object from gviz.
2892 * The data is expected to have a first column that is either a date or a
2893 * number. All subsequent columns must be numbers. If there is a clear mismatch
2894 * between this.xValueParser_ and the type of the first column, it will be
2895 * fixed. Fills out rawData_.
2896 * @param {[Object]} data See above.
2899 Dygraph
.prototype.parseDataTable_
= function(data
) {
2900 var shortTextForAnnotationNum
= function(num
) {
2901 // converts [0-9]+ [A-Z][a-z]*
2902 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
2903 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
2904 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
2905 num
= Math
.floor(num
/ 26);
2907 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
2908 num
= Math
.floor((num
- 1) / 26);
2913 var cols
= data
.getNumberOfColumns();
2914 var rows
= data
.getNumberOfRows();
2916 var indepType
= data
.getColumnType(0);
2917 if (indepType
== 'date' || indepType
== 'datetime') {
2918 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2919 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2920 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2921 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2922 } else if (indepType
== 'number') {
2923 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2924 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2925 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2926 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2928 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2929 "column 1 of DataTable input (Got '" + indepType
+ "')");
2933 // Array of the column indices which contain data (and not annotations).
2935 var annotationCols
= {}; // data index -> [annotation cols]
2936 var hasAnnotations
= false;
2938 for (i
= 1; i
< cols
; i
++) {
2939 var type
= data
.getColumnType(i
);
2940 if (type
== 'number') {
2942 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2943 // This is OK -- it's an annotation column.
2944 var dataIdx
= colIdx
[colIdx
.length
- 1];
2945 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2946 annotationCols
[dataIdx
] = [i
];
2948 annotationCols
[dataIdx
].push(i
);
2950 hasAnnotations
= true;
2952 this.error("Only 'number' is supported as a dependent type with Gviz." +
2953 " 'string' is only supported if displayAnnotations is true");
2957 // Read column labels
2958 // TODO(danvk): add support back for errorBars
2959 var labels
= [data
.getColumnLabel(0)];
2960 for (i
= 0; i
< colIdx
.length
; i
++) {
2961 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2962 if (this.attr_("errorBars")) i
+= 1;
2964 this.attrs_
.labels
= labels
;
2965 cols
= labels
.length
;
2968 var outOfOrder
= false;
2969 var annotations
= [];
2970 for (i
= 0; i
< rows
; i
++) {
2972 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2973 data
.getValue(i
, 0) === null) {
2974 this.warn("Ignoring row " + i
+
2975 " of DataTable because of undefined or null first column.");
2979 if (indepType
== 'date' || indepType
== 'datetime') {
2980 row
.push(data
.getValue(i
, 0).getTime());
2982 row
.push(data
.getValue(i
, 0));
2984 if (!this.attr_("errorBars")) {
2985 for (j
= 0; j
< colIdx
.length
; j
++) {
2986 var col
= colIdx
[j
];
2987 row
.push(data
.getValue(i
, col
));
2988 if (hasAnnotations
&&
2989 annotationCols
.hasOwnProperty(col
) &&
2990 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
2992 ann
.series
= data
.getColumnLabel(col
);
2994 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
2996 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2997 if (k
) ann
.text
+= "\n";
2998 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3000 annotations
.push(ann
);
3004 // Strip out infinities, which give dygraphs problems later on.
3005 for (j
= 0; j
< row
.length
; j
++) {
3006 if (!isFinite(row
[j
])) row
[j
] = null;
3009 for (j
= 0; j
< cols
- 1; j
++) {
3010 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3013 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3020 this.warn("DataTable is out of order; order it correctly to speed loading.");
3021 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3023 this.rawData_
= ret
;
3025 if (annotations
.length
> 0) {
3026 this.setAnnotations(annotations
, true);
3031 * Get the CSV data. If it's in a function, call that function. If it's in a
3032 * file, do an XMLHttpRequest to get it.
3035 Dygraph
.prototype.start_
= function() {
3036 var data
= this.file_
;
3038 // Functions can return references of all other types.
3039 if (typeof data
== 'function') {
3043 if (Dygraph
.isArrayLike(data
)) {
3044 this.rawData_
= this.parseArray_(data
);
3046 } else if (typeof data
== 'object' &&
3047 typeof data
.getColumnRange
== 'function') {
3048 // must be a DataTable from gviz.
3049 this.parseDataTable_(data
);
3051 } else if (typeof data
== 'string') {
3052 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3053 if (data
.indexOf('\n') >= 0) {
3054 this.loadedEvent_(data
);
3056 var req
= new XMLHttpRequest();
3058 req
.onreadystatechange
= function () {
3059 if (req
.readyState
== 4) {
3060 if (req
.status
=== 200 || // Normal http
3061 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3062 caller
.loadedEvent_(req
.responseText
);
3067 req
.open("GET", data
, true);
3071 this.error("Unknown data format: " + (typeof data
));
3076 * Changes various properties of the graph. These can include:
3078 * <li>file: changes the source data for the graph</li>
3079 * <li>errorBars: changes whether the data contains stddev</li>
3082 * There's a huge variety of options that can be passed to this method. For a
3083 * full list, see http://dygraphs.com/options.html.
3085 * @param {Object} attrs The new properties and values
3086 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3087 * call to updateOptions(). If you know better, you can pass true to explicitly
3088 * block the redraw. This can be useful for chaining updateOptions() calls,
3089 * avoiding the occasional infinite loop and preventing redraws when it's not
3090 * necessary (e.g. when updating a callback).
3092 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3093 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3095 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3096 var file
= input_attrs
.file
;
3097 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3099 // TODO(danvk): this is a mess. Move these options into attr_.
3100 if ('rollPeriod' in attrs
) {
3101 this.rollPeriod_
= attrs
.rollPeriod
;
3103 if ('dateWindow' in attrs
) {
3104 this.dateWindow_
= attrs
.dateWindow
;
3105 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3106 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3109 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3110 this.zoomed_y_
= (attrs
.valueRange
!== null);
3113 // TODO(danvk): validate per-series options.
3118 // highlightCircleSize
3120 // Check if this set options will require new points.
3121 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3123 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3127 if (!block_redraw
) this.start_();
3129 if (!block_redraw
) {
3130 if (requiresNewPoints
) {
3133 this.renderGraph_(false, false);
3140 * Returns a copy of the options with deprecated names converted into current
3141 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3142 * interested in that, they should save a copy before calling this.
3145 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3147 for (var k
in attrs
) {
3148 if (k
== 'file') continue;
3149 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3152 var set
= function(axis
, opt
, value
) {
3153 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3154 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3155 my_attrs
.axes
[axis
][opt
] = value
;
3157 var map
= function(opt
, axis
, new_opt
) {
3158 if (typeof(attrs
[opt
]) != 'undefined') {
3159 set(axis
, new_opt
, attrs
[opt
]);
3160 delete my_attrs
[opt
];
3164 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3165 map('xValueFormatter', 'x', 'valueFormatter');
3166 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3167 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3168 map('xTicker', 'x', 'ticker');
3169 map('yValueFormatter', 'y', 'valueFormatter');
3170 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3171 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3172 map('yTicker', 'y', 'ticker');
3177 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3178 * containing div (which has presumably changed size since the dygraph was
3179 * instantiated. If the width/height are specified, the div will be resized.
3181 * This is far more efficient than destroying and re-instantiating a
3182 * Dygraph, since it doesn't have to reparse the underlying data.
3184 * @param {Number} [width] Width (in pixels)
3185 * @param {Number} [height] Height (in pixels)
3187 Dygraph
.prototype.resize
= function(width
, height
) {
3188 if (this.resize_lock
) {
3191 this.resize_lock
= true;
3193 if ((width
=== null) != (height
=== null)) {
3194 this.warn("Dygraph.resize() should be called with zero parameters or " +
3195 "two non-NULL parameters. Pretending it was zero.");
3196 width
= height
= null;
3199 var old_width
= this.width_
;
3200 var old_height
= this.height_
;
3203 this.maindiv_
.style
.width
= width
+ "px";
3204 this.maindiv_
.style
.height
= height
+ "px";
3205 this.width_
= width
;
3206 this.height_
= height
;
3208 this.width_
= this.maindiv_
.clientWidth
;
3209 this.height_
= this.maindiv_
.clientHeight
;
3212 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3213 // TODO(danvk): there should be a clear() method.
3214 this.maindiv_
.innerHTML
= "";
3215 this.roller_
= null;
3216 this.attrs_
.labelsDiv
= null;
3217 this.createInterface_();
3218 if (this.annotations_
.length
) {
3219 // createInterface_ reset the layout, so we need to do this.
3220 this.layout_
.setAnnotations(this.annotations_
);
3225 this.resize_lock
= false;
3229 * Adjusts the number of points in the rolling average. Updates the graph to
3230 * reflect the new averaging period.
3231 * @param {Number} length Number of points over which to average the data.
3233 Dygraph
.prototype.adjustRoll
= function(length
) {
3234 this.rollPeriod_
= length
;
3239 * Returns a boolean array of visibility statuses.
3241 Dygraph
.prototype.visibility
= function() {
3242 // Do lazy-initialization, so that this happens after we know the number of
3244 if (!this.attr_("visibility")) {
3245 this.attrs_
.visibility
= [];
3247 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3248 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3249 this.attrs_
.visibility
.push(true);
3251 return this.attr_("visibility");
3255 * Changes the visiblity of a series.
3257 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3258 var x
= this.visibility();
3259 if (num
< 0 || num
>= x
.length
) {
3260 this.warn("invalid series number in setVisibility: " + num
);
3268 * How large of an area will the dygraph render itself in?
3269 * This is used for testing.
3270 * @return A {width: w, height: h} object.
3273 Dygraph
.prototype.size
= function() {
3274 return { width
: this.width_
, height
: this.height_
};
3278 * Update the list of annotations and redraw the chart.
3279 * See dygraphs.com/annotations.html for more info on how to use annotations.
3280 * @param ann {Array} An array of annotation objects.
3281 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3283 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3284 // Only add the annotation CSS rule once we know it will be used.
3285 Dygraph
.addAnnotationRule();
3286 this.annotations_
= ann
;
3287 this.layout_
.setAnnotations(this.annotations_
);
3288 if (!suppressDraw
) {
3294 * Return the list of annotations.
3296 Dygraph
.prototype.annotations
= function() {
3297 return this.annotations_
;
3301 * Get the list of label names for this graph. The first column is the
3302 * x-axis, so the data series names start at index 1.
3304 Dygraph
.prototype.getLabels
= function(name
) {
3305 return this.attr_("labels").slice();
3309 * Get the index of a series (column) given its name. The first column is the
3310 * x-axis, so the data series start with index 1.
3312 Dygraph
.prototype.indexFromSetName
= function(name
) {
3313 return this.setIndexByName_
[name
];
3318 * Adds a default style for the annotation CSS classes to the document. This is
3319 * only executed when annotations are actually used. It is designed to only be
3320 * called once -- all calls after the first will return immediately.
3322 Dygraph
.addAnnotationRule
= function() {
3323 if (Dygraph
.addedAnnotationCSS
) return;
3325 var rule
= "border: 1px solid black; " +
3326 "background-color: white; " +
3327 "text-align: center;";
3329 var styleSheetElement
= document
.createElement("style");
3330 styleSheetElement
.type
= "text/css";
3331 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3333 // Find the first style sheet that we can access.
3334 // We may not add a rule to a style sheet from another domain for security
3335 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3336 // adds its own style sheets from google.com.
3337 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3338 if (document
.styleSheets
[i
].disabled
) continue;
3339 var mysheet
= document
.styleSheets
[i
];
3341 if (mysheet
.insertRule
) { // Firefox
3342 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3343 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3344 } else if (mysheet
.addRule
) { // IE
3345 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3347 Dygraph
.addedAnnotationCSS
= true;
3350 // Was likely a security exception.
3354 this.warn("Unable to add default annotation CSS rule; display may be off.");
3357 // Older pages may still use this name.
3358 var DateGraph
= Dygraph
;