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/
49 * Creates an interactive, zoomable chart.
52 * @param {div | String} div A div or the id of a div into which to construct
54 * @param {String | Function} file A file containing CSV data or a function
55 * that returns this data. The most basic expected format for each line is
56 * "YYYY/MM/DD,val1,val2,...". For more information, see
57 * http://dygraphs.com/data.html.
58 * @param {Object} attrs Various other attributes, e.g. errorBars determines
59 * whether the input data contains error ranges. For a complete list of
60 * options, see http://dygraphs.com/options.html.
62 var Dygraph
= function(div
, data
, opts
) {
63 if (arguments
.length
> 0) {
64 if (arguments
.length
== 4) {
65 // Old versions of dygraphs took in the series labels as a constructor
66 // parameter. This doesn't make sense anymore, but it's easy to continue
67 // to support this usage.
68 this.warn("Using deprecated four-argument dygraph constructor");
69 this.__old_init__(div
, data
, arguments
[2], arguments
[3]);
71 this.__init__(div
, data
, opts
);
76 Dygraph
.NAME
= "Dygraph";
77 Dygraph
.VERSION
= "1.2";
78 Dygraph
.__repr__
= function() {
79 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
83 * Returns information about the Dygraph class.
85 Dygraph
.toString
= function() {
86 return this.__repr__();
89 // Various default values
90 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
91 Dygraph
.DEFAULT_WIDTH
= 480;
92 Dygraph
.DEFAULT_HEIGHT
= 320;
94 Dygraph
.ANIMATION_STEPS
= 10;
95 Dygraph
.ANIMATION_DURATION
= 200;
97 // These are defined before DEFAULT_ATTRS so that it can refer to them.
100 * Return a string version of a number. This respects the digitsAfterDecimal
101 * and maxNumberWidth options.
102 * @param {Number} x The number to be formatted
103 * @param {Dygraph} opts An options view
104 * @param {String} name The name of the point's data series
105 * @param {Dygraph} g The dygraph object
107 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
108 var sigFigs
= opts('sigFigs');
110 if (sigFigs
!== null) {
111 // User has opted for a fixed number of significant figures.
112 return Dygraph
.floatFormat(x
, sigFigs
);
115 var digits
= opts('digitsAfterDecimal');
116 var maxNumberWidth
= opts('maxNumberWidth');
118 // switch to scientific notation if we underflow or overflow fixed display.
120 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
121 Math
.abs(x
) < Math
.pow(10, -digits
))) {
122 return x
.toExponential(digits
);
124 return '' + Dygraph
.round_(x
, digits
);
129 * variant for use as an axisLabelFormatter.
132 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
133 return Dygraph
.numberValueFormatter(x
, opts
, g
);
137 * Convert a JS date (millis since epoch) to YYYY/MM/DD
138 * @param {Number} date The JavaScript date (ms since epoch)
139 * @return {String} A date of the form "YYYY/MM/DD"
142 Dygraph
.dateString_
= function(date
) {
143 var zeropad
= Dygraph
.zeropad
;
144 var d
= new Date(date
);
147 var year
= "" + d
.getFullYear();
148 // Get a 0 padded month string
149 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
150 // Get a 0 padded day string
151 var day
= zeropad(d
.getDate());
154 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
155 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
157 return year
+ "/" + month + "/" + day
+ ret
;
161 * Convert a JS date to a string appropriate to display on an axis that
162 * is displaying values at the stated granularity.
163 * @param {Date} date The date to format
164 * @param {Number} granularity One of the Dygraph granularity constants
165 * @return {String} The formatted date
168 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
169 if (granularity
>= Dygraph
.DECADAL
) {
170 return date
.strftime('%Y');
171 } else if (granularity
>= Dygraph
.MONTHLY
) {
172 return date
.strftime('%b %y');
174 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
175 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
176 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
178 return Dygraph
.hmsString_(date
.getTime());
184 // Default attribute values.
185 Dygraph
.DEFAULT_ATTRS
= {
186 highlightCircleSize
: 3,
190 // TODO(danvk): move defaults from createStatusMessage_ here.
192 labelsSeparateLines
: false,
193 labelsShowZeroValues
: true,
196 showLabelsOnHighlight
: true,
198 digitsAfterDecimal
: 2,
205 axisLabelFontSize
: 14,
211 xValueParser
: Dygraph
.dateParser
,
218 wilsonInterval
: true, // only relevant if fractions is true
222 connectSeparatedPoints
: false,
225 hideOverlayOnMouseOut
: true,
227 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
228 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
233 // Sizes of the various chart labels.
240 axisLineColor
: "black",
243 axisLabelColor
: "black",
244 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
248 gridLineColor
: "rgb(128,128,128)",
250 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
251 animatedZooms
: false, // (for now)
253 // Range selector options
254 showRangeSelector
: false,
255 rangeSelectorHeight
: 40,
256 rangeSelectorPlotStrokeColor
: "#808FAB",
257 rangeSelectorPlotFillColor
: "#A7B1C4",
263 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
264 valueFormatter
: Dygraph
.dateString_
,
265 ticker
: null // will be set in dygraph-tickers.js
269 valueFormatter
: Dygraph
.numberValueFormatter
,
270 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
271 ticker
: null // will be set in dygraph-tickers.js
275 valueFormatter
: Dygraph
.numberValueFormatter
,
276 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
277 ticker
: null // will be set in dygraph-tickers.js
282 // Directions for panning and zooming. Use bit operations when combined
283 // values are possible.
284 Dygraph
.HORIZONTAL
= 1;
285 Dygraph
.VERTICAL
= 2;
287 // Used for initializing annotation CSS rules only once.
288 Dygraph
.addedAnnotationCSS
= false;
290 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
291 // Labels is no longer a constructor parameter, since it's typically set
292 // directly from the data source. It also conains a name for the x-axis,
293 // which the previous constructor form did not.
294 if (labels
!= null) {
295 var new_labels
= ["Date"];
296 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
297 Dygraph
.update(attrs
, { 'labels': new_labels
});
299 this.__init__(div
, file
, attrs
);
303 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
304 * and context <canvas> inside of it. See the constructor for details.
306 * @param {Element} div the Element to render the graph into.
307 * @param {String | Function} file Source data
308 * @param {Object} attrs Miscellaneous other options
311 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
312 // Hack for IE: if we're using excanvas and the document hasn't finished
313 // loading yet (and hence may not have initialized whatever it needs to
314 // initialize), then keep calling this routine periodically until it has.
315 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
316 typeof(G_vmlCanvasManager
) != 'undefined' &&
317 document
.readyState
!= 'complete') {
319 setTimeout(function() { self
.__init__(div
, file
, attrs
) }, 100);
323 // Support two-argument constructor
324 if (attrs
== null) { attrs
= {}; }
326 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
329 Dygraph
.error("Constructing dygraph with a non-existent div!");
333 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
335 // Copy the important bits into the object
336 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
339 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
340 this.previousVerticalX_
= -1;
341 this.fractions_
= attrs
.fractions
|| false;
342 this.dateWindow_
= attrs
.dateWindow
|| null;
344 this.is_initial_draw_
= true;
345 this.annotations_
= [];
347 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
348 this.zoomed_x_
= false;
349 this.zoomed_y_
= false;
351 // Clear the div. This ensure that, if multiple dygraphs are passed the same
352 // div, then only one will be drawn.
355 // For historical reasons, the 'width' and 'height' options trump all CSS
356 // rules _except_ for an explicit 'width' or 'height' on the div.
357 // As an added convenience, if the div has zero height (like <div></div> does
358 // without any styles), then we use a default height/width
.
359 if (div
.style
.width
== '' && attrs
.width
) {
360 div
.style
.width
= attrs
.width
+ "px";
362 if (div
.style
.height
== '' && attrs
.height
) {
363 div
.style
.height
= attrs
.height
+ "px";
365 if (div
.style
.height
== '' && div
.clientHeight
== 0) {
366 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
367 if (div
.style
.width
== '') {
368 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
371 // these will be zero if the dygraph's div is hidden.
372 this.width_
= div
.clientWidth
;
373 this.height_
= div
.clientHeight
;
375 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
376 if (attrs
['stackedGraph']) {
377 attrs
['fillGraph'] = true;
378 // TODO(nikhilk): Add any other stackedGraph checks here.
381 // Dygraphs has many options, some of which interact with one another.
382 // To keep track of everything, we maintain two sets of options:
384 // this.user_attrs_ only options explicitly set by the user.
385 // this.attrs_ defaults, options derived from user_attrs_, data.
387 // Options are then accessed this.attr_('attr'), which first looks at
388 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
389 // defaults without overriding behavior that the user specifically asks for.
390 this.user_attrs_
= {};
391 Dygraph
.update(this.user_attrs_
, attrs
);
393 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
395 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
397 this.boundaryIds_
= [];
399 // Create the containing DIV and other interactive elements
400 this.createInterface_();
406 * Returns the zoomed status of the chart for one or both axes.
408 * Axis is an optional parameter. Can be set to 'x' or 'y'.
410 * The zoomed status for an axis is set whenever a user zooms using the mouse
411 * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom
412 * option is also specified).
414 Dygraph
.prototype.isZoomed
= function(axis
) {
415 if (axis
== null) return this.zoomed_x_
|| this.zoomed_y_
;
416 if (axis
== 'x') return this.zoomed_x_
;
417 if (axis
== 'y') return this.zoomed_y_
;
418 throw "axis parameter to Dygraph.isZoomed must be missing, 'x' or 'y'.";
422 * Returns information about the Dygraph object, including its containing ID.
424 Dygraph
.prototype.toString
= function() {
425 var maindiv
= this.maindiv_
;
426 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
427 return "[Dygraph " + id
+ "]";
432 * Returns the value of an option. This may be set by the user (either in the
433 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
435 * @param { String } name The name of the option, e.g. 'rollPeriod'.
436 * @param { String } [seriesName] The name of the series to which the option
437 * will be applied. If no per-series value of this option is available, then
438 * the global value is returned. This is optional.
439 * @return { ... } The value of the option.
441 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
442 // <REMOVE_FOR_COMBINED>
443 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
444 this.error('Must include options reference JS for testing');
445 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
446 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
447 'in the Dygraphs.OPTIONS_REFERENCE listing.');
448 // Only log this error once.
449 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
451 // </REMOVE_FOR_COMBINED
>
453 typeof(this.user_attrs_
[seriesName
]) != 'undefined' &&
454 this.user_attrs_
[seriesName
] != null &&
455 typeof(this.user_attrs_
[seriesName
][name
]) != 'undefined') {
456 return this.user_attrs_
[seriesName
][name
];
457 } else if (typeof(this.user_attrs_
[name
]) != 'undefined') {
458 return this.user_attrs_
[name
];
459 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
460 return this.attrs_
[name
];
468 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
469 * @return { ... } A function mapping string -> option value
471 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
473 return function(opt
) {
474 var axis_opts
= self
.user_attrs_
['axes'];
475 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
476 return axis_opts
[axis
][opt
];
478 // user-specified attributes always trump defaults, even if they're less
480 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
481 return self
.user_attrs_
[opt
];
484 axis_opts
= self
.attrs_
['axes'];
485 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
][opt
]) {
486 return axis_opts
[axis
][opt
];
488 // check old-style axis options
489 // TODO(danvk): add a deprecation warning if either of these match.
490 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
491 return self
.axes_
[0][opt
];
492 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
493 return self
.axes_
[1][opt
];
495 return self
.attr_(opt
);
500 * Returns the current rolling period, as set by the user or an option.
501 * @return {Number} The number of points in the rolling window
503 Dygraph
.prototype.rollPeriod
= function() {
504 return this.rollPeriod_
;
508 * Returns the currently-visible x-range. This can be affected by zooming,
509 * panning or a call to updateOptions.
510 * Returns a two-element array: [left, right].
511 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
513 Dygraph
.prototype.xAxisRange
= function() {
514 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
518 * Returns the lower- and upper-bound x-axis values of the
521 Dygraph
.prototype.xAxisExtremes
= function() {
522 var left
= this.rawData_
[0][0];
523 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
524 return [left
, right
];
528 * Returns the currently-visible y-range for an axis. This can be affected by
529 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
530 * called with no arguments, returns the range of the first axis.
531 * Returns a two-element array: [bottom, top].
533 Dygraph
.prototype.yAxisRange
= function(idx
) {
534 if (typeof(idx
) == "undefined") idx
= 0;
535 if (idx
< 0 || idx
>= this.axes_
.length
) {
538 var axis
= this.axes_
[idx
];
539 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
543 * Returns the currently-visible y-ranges for each axis. This can be affected by
544 * zooming, panning, calls to updateOptions, etc.
545 * Returns an array of [bottom, top] pairs, one for each y-axis.
547 Dygraph
.prototype.yAxisRanges
= function() {
549 for (var i
= 0; i
< this.axes_
.length
; i
++) {
550 ret
.push(this.yAxisRange(i
));
555 // TODO(danvk): use these functions throughout dygraphs.
557 * Convert from data coordinates to canvas/div X/Y coordinates.
558 * If specified, do this conversion for the coordinate system of a particular
559 * axis. Uses the first axis by default.
560 * Returns a two-element array: [X, Y]
562 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
563 * instead of toDomCoords(null, y, axis).
565 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
566 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
570 * Convert from data x coordinates to canvas/div X coordinate.
571 * If specified, do this conversion for the coordinate system of a particular
573 * Returns a single value or null if x is null.
575 Dygraph
.prototype.toDomXCoord
= function(x
) {
580 var area
= this.plotter_
.area
;
581 var xRange
= this.xAxisRange();
582 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
586 * Convert from data x coordinates to canvas/div Y coordinate and optional
587 * axis. Uses the first axis by default.
589 * returns a single value or null if y is null.
591 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
592 var pct
= this.toPercentYCoord(y
, axis
);
597 var area
= this.plotter_
.area
;
598 return area
.y
+ pct
* area
.h
;
602 * Convert from canvas/div coords to data coordinates.
603 * If specified, do this conversion for the coordinate system of a particular
604 * axis. Uses the first axis by default.
605 * Returns a two-element array: [X, Y].
607 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
608 * instead of toDataCoords(null, y, axis).
610 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
611 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
615 * Convert from canvas/div x coordinate to data coordinate.
617 * If x is null, this returns null.
619 Dygraph
.prototype.toDataXCoord
= function(x
) {
624 var area
= this.plotter_
.area
;
625 var xRange
= this.xAxisRange();
626 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
630 * Convert from canvas/div y coord to value.
632 * If y is null, this returns null.
633 * if axis is null, this uses the first axis.
635 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
640 var area
= this.plotter_
.area
;
641 var yRange
= this.yAxisRange(axis
);
643 if (typeof(axis
) == "undefined") axis
= 0;
644 if (!this.axes_
[axis
].logscale
) {
645 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
647 // Computing the inverse of toDomCoord.
648 var pct
= (y
- area
.y
) / area
.h
650 // Computing the inverse of toPercentYCoord. The function was arrived at with
651 // the following steps:
653 // Original calcuation:
654 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
656 // Move denominator to both sides:
657 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
659 // subtract logr1, and take the negative value.
660 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
662 // Swap both sides of the equation, and we can compute the log of the
663 // return value. Which means we just need to use that as the exponent in
665 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
667 var logr1
= Dygraph
.log10(yRange
[1]);
668 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
669 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
675 * Converts a y for an axis to a percentage from the top to the
676 * bottom of the drawing area.
678 * If the coordinate represents a value visible on the canvas, then
679 * the value will be between 0 and 1, where 0 is the top of the canvas.
680 * However, this method will return values outside the range, as
681 * values can fall outside the canvas.
683 * If y is null, this returns null.
684 * if axis is null, this uses the first axis.
686 * @param { Number } y The data y-coordinate.
687 * @param { Number } [axis] The axis number on which the data coordinate lives.
688 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
690 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
694 if (typeof(axis
) == "undefined") axis
= 0;
696 var area
= this.plotter_
.area
;
697 var yRange
= this.yAxisRange(axis
);
700 if (!this.axes_
[axis
].logscale
) {
701 // yRange[1] - y is unit distance from the bottom.
702 // yRange[1] - yRange[0] is the scale of the range.
703 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
704 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
706 var logr1
= Dygraph
.log10(yRange
[1]);
707 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
713 * Converts an x value to a percentage from the left to the right of
716 * If the coordinate represents a value visible on the canvas, then
717 * the value will be between 0 and 1, where 0 is the left of the canvas.
718 * However, this method will return values outside the range, as
719 * values can fall outside the canvas.
721 * If x is null, this returns null.
722 * @param { Number } x The data x-coordinate.
723 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
725 Dygraph
.prototype.toPercentXCoord
= function(x
) {
730 var xRange
= this.xAxisRange();
731 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
735 * Returns the number of columns (including the independent variable).
736 * @return { Integer } The number of columns.
738 Dygraph
.prototype.numColumns
= function() {
739 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
743 * Returns the number of rows (excluding any header/label row).
744 * @return { Integer } The number of rows, less any header.
746 Dygraph
.prototype.numRows
= function() {
747 return this.rawData_
.length
;
751 * Returns the full range of the x-axis, as determined by the most extreme
752 * values in the data set. Not affected by zooming, visibility, etc.
753 * TODO(danvk): merge w/ xAxisExtremes
754 * @return { Array<Number> } A [low, high] pair
757 Dygraph
.prototype.fullXRange_
= function() {
758 if (this.numRows() > 0) {
759 return [this.rawData_
[0][0], this.rawData_
[this.numRows() - 1][0]];
766 * Returns the value in the given row and column. If the row and column exceed
767 * the bounds on the data, returns null. Also returns null if the value is
769 * @param { Number} row The row number of the data (0-based). Row 0 is the
770 * first row of data, not a header row.
771 * @param { Number} col The column number of the data (0-based)
772 * @return { Number } The value in the specified cell or null if the row/col
775 Dygraph
.prototype.getValue
= function(row
, col
) {
776 if (row
< 0 || row
> this.rawData_
.length
) return null;
777 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
779 return this.rawData_
[row
][col
];
783 * Generates interface elements for the Dygraph: a containing div, a div to
784 * display the current point, and a textbox to adjust the rolling average
785 * period. Also creates the Renderer/Layout elements.
788 Dygraph
.prototype.createInterface_
= function() {
789 // Create the all-enclosing graph div
790 var enclosing
= this.maindiv_
;
792 this.graphDiv
= document
.createElement("div");
793 this.graphDiv
.style
.width
= this.width_
+ "px";
794 this.graphDiv
.style
.height
= this.height_
+ "px";
795 enclosing
.appendChild(this.graphDiv
);
797 // Create the canvas for interactive parts of the chart.
798 this.canvas_
= Dygraph
.createCanvas();
799 this.canvas_
.style
.position
= "absolute";
800 this.canvas_
.width
= this.width_
;
801 this.canvas_
.height
= this.height_
;
802 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
803 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
805 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
807 // ... and for static parts of the chart.
808 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
809 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
811 if (this.attr_('showRangeSelector')) {
812 // The range selector must be created here so that its canvases and contexts get created here.
813 // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
814 // The range selector also sets xAxisHeight in order to reserve space.
815 this.rangeSelector_
= new DygraphRangeSelector(this);
818 // The interactive parts of the graph are drawn on top of the chart.
819 this.graphDiv
.appendChild(this.hidden_
);
820 this.graphDiv
.appendChild(this.canvas_
);
821 this.mouseEventElement_
= this.createMouseEventElement_();
823 // Create the grapher
824 this.layout_
= new DygraphLayout(this);
826 if (this.rangeSelector_
) {
827 // This needs to happen after the graph canvases are added to the div and the layout object is created.
828 this.rangeSelector_
.addToGraph(this.graphDiv
, this.layout_
);
832 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(e
) {
833 dygraph
.mouseMove_(e
);
835 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(e
) {
836 dygraph
.mouseOut_(e
);
839 this.createStatusMessage_();
840 this.createDragInterface_();
842 // Update when the window is resized.
843 // TODO(danvk): drop frames depending on complexity of the chart.
844 Dygraph
.addEvent(window
, 'resize', function(e
) {
850 * Detach DOM elements in the dygraph and null out all data references.
851 * Calling this when you're done with a dygraph can dramatically reduce memory
852 * usage. See, e.g., the tests/perf.html example.
854 Dygraph
.prototype.destroy
= function() {
855 var removeRecursive
= function(node
) {
856 while (node
.hasChildNodes()) {
857 removeRecursive(node
.firstChild
);
858 node
.removeChild(node
.firstChild
);
861 removeRecursive(this.maindiv_
);
863 var nullOut
= function(obj
) {
865 if (typeof(obj
[n
]) === 'object') {
871 // These may not all be necessary, but it can't hurt...
872 nullOut(this.layout_
);
873 nullOut(this.plotter_
);
878 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
879 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
880 * or the zoom rectangles) is done on this.canvas_.
881 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
882 * @return {Object} The newly-created canvas
885 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
886 var h
= Dygraph
.createCanvas();
887 h
.style
.position
= "absolute";
888 // TODO(danvk): h should be offset from canvas. canvas needs to include
889 // some extra area to make it easier to zoom in on the far left and far
890 // right. h needs to be precisely the plot area, so that clipping occurs.
891 h
.style
.top
= canvas
.style
.top
;
892 h
.style
.left
= canvas
.style
.left
;
893 h
.width
= this.width_
;
894 h
.height
= this.height_
;
895 h
.style
.width
= this.width_
+ "px"; // for IE
896 h
.style
.height
= this.height_
+ "px"; // for IE
901 * Creates an overlay element used to handle mouse events.
902 * @return {Object} The mouse event element.
905 Dygraph
.prototype.createMouseEventElement_
= function() {
906 if (this.isUsingExcanvas_
) {
907 var elem
= document
.createElement("div");
908 elem
.style
.position
= 'absolute';
909 elem
.style
.backgroundColor
= 'white';
910 elem
.style
.filter
= 'alpha(opacity=0)';
911 elem
.style
.width
= this.width_
+ "px";
912 elem
.style
.height
= this.height_
+ "px";
913 this.graphDiv
.appendChild(elem
);
921 * Generate a set of distinct colors for the data series. This is done with a
922 * color wheel. Saturation/Value are customizable, and the hue is
923 * equally-spaced around the color wheel. If a custom set of colors is
924 * specified, that is used instead.
927 Dygraph
.prototype.setColors_
= function() {
928 var num
= this.attr_("labels").length
- 1;
930 var colors
= this.attr_('colors');
932 var sat
= this.attr_('colorSaturation') || 1.0;
933 var val
= this.attr_('colorValue') || 0.5;
934 var half
= Math
.ceil(num
/ 2);
935 for (var i
= 1; i
<= num
; i
++) {
936 if (!this.visibility()[i
-1]) continue;
937 // alternate colors for high contrast.
938 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
939 var hue
= (1.0 * idx
/ (1 + num
));
940 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
943 for (var i
= 0; i
< num
; i
++) {
944 if (!this.visibility()[i
]) continue;
945 var colorStr
= colors
[i
% colors
.length
];
946 this.colors_
.push(colorStr
);
950 this.plotter_
.setColors(this.colors_
);
954 * Return the list of colors. This is either the list of colors passed in the
955 * attributes or the autogenerated list of rgb(r,g,b) strings.
956 * @return {Array<string>} The list of colors.
958 Dygraph
.prototype.getColors
= function() {
963 * Create the div that contains information on the selected point(s)
964 * This goes in the top right of the canvas, unless an external div has already
968 Dygraph
.prototype.createStatusMessage_
= function() {
969 var userLabelsDiv
= this.user_attrs_
["labelsDiv"];
970 if (userLabelsDiv
&& null != userLabelsDiv
971 && (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
972 this.user_attrs_
["labelsDiv"] = document
.getElementById(userLabelsDiv
);
974 if (!this.attr_("labelsDiv")) {
975 var divWidth
= this.attr_('labelsDivWidth');
977 "position": "absolute",
980 "width": divWidth
+ "px",
982 "left": (this.width_
- divWidth
- 2) + "px",
983 "background": "white",
985 "overflow": "hidden"};
986 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
987 var div
= document
.createElement("div");
988 div
.className
= "dygraph-legend";
989 for (var name
in messagestyle
) {
990 if (messagestyle
.hasOwnProperty(name
)) {
991 div
.style
[name
] = messagestyle
[name
];
994 this.graphDiv
.appendChild(div
);
995 this.attrs_
.labelsDiv
= div
;
1000 * Position the labels div so that:
1001 * - its right edge is flush with the right edge of the charting area
1002 * - its top edge is flush with the top edge of the charting area
1005 Dygraph
.prototype.positionLabelsDiv_
= function() {
1006 // Don't touch a user-specified labelsDiv.
1007 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
1009 var area
= this.plotter_
.area
;
1010 var div
= this.attr_("labelsDiv");
1011 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
1012 div
.style
.top
= area
.y
+ "px";
1016 * Create the text box to adjust the averaging period
1019 Dygraph
.prototype.createRollInterface_
= function() {
1020 // Create a roller if one doesn't exist already.
1021 if (!this.roller_
) {
1022 this.roller_
= document
.createElement("input");
1023 this.roller_
.type
= "text";
1024 this.roller_
.style
.display
= "none";
1025 this.graphDiv
.appendChild(this.roller_
);
1028 var display
= this.attr_('showRoller') ? 'block' : 'none';
1030 var area
= this.plotter_
.area
;
1031 var textAttr
= { "position": "absolute",
1033 "top": (area
.y
+ area
.h
- 25) + "px",
1034 "left": (area
.x
+ 1) + "px",
1037 this.roller_
.size
= "2";
1038 this.roller_
.value
= this.rollPeriod_
;
1039 for (var name
in textAttr
) {
1040 if (textAttr
.hasOwnProperty(name
)) {
1041 this.roller_
.style
[name
] = textAttr
[name
];
1046 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1051 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1052 * canvas (i.e. DOM Coords).
1054 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1055 return Dygraph
.pageX(e
) - context
.px
1060 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1061 * canvas (i.e. DOM Coords).
1063 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1064 return Dygraph
.pageY(e
) - context
.py
1068 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1072 Dygraph
.prototype.createDragInterface_
= function() {
1074 // Tracks whether the mouse is down right now
1076 isPanning
: false, // is this drag part of a pan?
1077 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1078 dragStartX
: null, // pixel coordinates
1079 dragStartY
: null, // pixel coordinates
1080 dragEndX
: null, // pixel coordinates
1081 dragEndY
: null, // pixel coordinates
1082 dragDirection
: null,
1083 prevEndX
: null, // pixel coordinates
1084 prevEndY
: null, // pixel coordinates
1085 prevDragDirection
: null,
1087 // The value on the left side of the graph when a pan operation starts.
1088 initialLeftmostDate
: null,
1090 // The number of units each pixel spans. (This won't be valid for log
1092 xUnitsPerPixel
: null,
1094 // TODO(danvk): update this comment
1095 // The range in second/value units that the viewport encompasses during a
1096 // panning operation.
1099 // Top-left corner of the canvas, in DOM coords
1100 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1104 // Values for use with panEdgeFraction, which limit how far outside the
1105 // graph's data boundaries it can be panned.
1106 boundedDates
: null, // [minDate, maxDate]
1107 boundedValues
: null, // [[minValue, maxValue] ...]
1109 initializeMouseDown
: function(event
, g
, context
) {
1110 // prevents mouse drags from selecting page text.
1111 if (event
.preventDefault
) {
1112 event
.preventDefault(); // Firefox, Chrome, etc.
1114 event
.returnValue
= false; // IE
1115 event
.cancelBubble
= true;
1118 context
.px
= Dygraph
.findPosX(g
.canvas_
);
1119 context
.py
= Dygraph
.findPosY(g
.canvas_
);
1120 context
.dragStartX
= g
.dragGetX_(event
, context
);
1121 context
.dragStartY
= g
.dragGetY_(event
, context
);
1125 var interactionModel
= this.attr_("interactionModel");
1127 // Self is the graph.
1130 // Function that binds the graph and context to the handler.
1131 var bindHandler
= function(handler
) {
1132 return function(event
) {
1133 handler(event
, self
, context
);
1137 for (var eventName
in interactionModel
) {
1138 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1139 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
1140 bindHandler(interactionModel
[eventName
]));
1143 // If the user releases the mouse button during a drag, but not over the
1144 // canvas, then it doesn't count as a zooming action.
1145 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
1146 if (context
.isZooming
|| context
.isPanning
) {
1147 context
.isZooming
= false;
1148 context
.dragStartX
= null;
1149 context
.dragStartY
= null;
1152 if (context
.isPanning
) {
1153 context
.isPanning
= false;
1154 context
.draggingDate
= null;
1155 context
.dateRange
= null;
1156 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1157 delete self
.axes_
[i
].draggingValue
;
1158 delete self
.axes_
[i
].dragValueRange
;
1165 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1166 * up any previous zoom rectangles that were drawn. This could be optimized to
1167 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1170 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1171 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1172 * @param {Number} startX The X position where the drag started, in canvas
1174 * @param {Number} endX The current X position of the drag, in canvas coords.
1175 * @param {Number} startY The Y position where the drag started, in canvas
1177 * @param {Number} endY The current Y position of the drag, in canvas coords.
1178 * @param {Number} prevDirection the value of direction on the previous call to
1179 * this function. Used to avoid excess redrawing
1180 * @param {Number} prevEndX The value of endX on the previous call to this
1181 * function. Used to avoid excess redrawing
1182 * @param {Number} prevEndY The value of endY on the previous call to this
1183 * function. Used to avoid excess redrawing
1186 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1187 endY
, prevDirection
, prevEndX
,
1189 var ctx
= this.canvas_ctx_
;
1191 // Clean up from the previous rect if necessary
1192 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1193 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1194 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1195 } else if (prevDirection
== Dygraph
.VERTICAL
){
1196 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1197 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1200 // Draw a light-grey rectangle to show the new viewing area
1201 if (direction
== Dygraph
.HORIZONTAL
) {
1202 if (endX
&& startX
) {
1203 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1204 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1205 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1207 } else if (direction
== Dygraph
.VERTICAL
) {
1208 if (endY
&& startY
) {
1209 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1210 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1211 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1215 if (this.isUsingExcanvas_
) {
1216 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1221 * Clear the zoom rectangle (and perform no zoom).
1224 Dygraph
.prototype.clearZoomRect_
= function() {
1225 this.currentZoomRectArgs_
= null;
1226 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1230 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1231 * the canvas. The exact zoom window may be slightly larger if there are no data
1232 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1233 * which accepts dates that match the raw data. This function redraws the graph.
1235 * @param {Number} lowX The leftmost pixel value that should be visible.
1236 * @param {Number} highX The rightmost pixel value that should be visible.
1239 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1240 this.currentZoomRectArgs_
= null;
1241 // Find the earliest and latest dates contained in this canvasx range.
1242 // Convert the call to date ranges of the raw data.
1243 var minDate
= this.toDataXCoord(lowX
);
1244 var maxDate
= this.toDataXCoord(highX
);
1245 this.doZoomXDates_(minDate
, maxDate
);
1249 * Transition function to use in animations. Returns values between 0.0
1250 * (totally old values) and 1.0 (totally new values) for each frame.
1253 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1255 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1259 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1260 * method with doZoomX which accepts pixel coordinates. This function redraws
1263 * @param {Number} minDate The minimum date that should be visible.
1264 * @param {Number} maxDate The maximum date that should be visible.
1267 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1268 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1269 // can produce strange effects. Rather than the y-axis transitioning slowly
1270 // between values, it can jerk around.)
1271 var old_window
= this.xAxisRange();
1272 var new_window
= [minDate
, maxDate
];
1273 this.zoomed_x_
= true;
1275 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1276 if (that
.attr_("zoomCallback")) {
1277 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1283 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1284 * the canvas. This function redraws the graph.
1286 * @param {Number} lowY The topmost pixel value that should be visible.
1287 * @param {Number} highY The lowest pixel value that should be visible.
1290 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1291 this.currentZoomRectArgs_
= null;
1292 // Find the highest and lowest values in pixel range for each axis.
1293 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1294 // This is because pixels increase as you go down on the screen, whereas data
1295 // coordinates increase as you go up the screen.
1296 var oldValueRanges
= this.yAxisRanges();
1297 var newValueRanges
= [];
1298 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1299 var hi
= this.toDataYCoord(lowY
, i
);
1300 var low
= this.toDataYCoord(highY
, i
);
1301 newValueRanges
.push([low
, hi
]);
1304 this.zoomed_y_
= true;
1306 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1307 if (that
.attr_("zoomCallback")) {
1308 var xRange
= that
.xAxisRange();
1309 var yRange
= that
.yAxisRange();
1310 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1316 * Reset the zoom to the original view coordinates. This is the same as
1317 * double-clicking on the graph.
1321 Dygraph
.prototype.doUnzoom_
= function() {
1322 var dirty
= false, dirtyX
= false, dirtyY
= false;
1323 if (this.dateWindow_
!= null) {
1328 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1329 if (this.axes_
[i
].valueWindow
!= null) {
1335 // Clear any selection, since it's likely to be drawn in the wrong place.
1336 this.clearSelection();
1339 this.zoomed_x_
= false;
1340 this.zoomed_y_
= false;
1342 var minDate
= this.rawData_
[0][0];
1343 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1345 // With only one frame, don't bother calculating extreme ranges.
1346 // TODO(danvk): merge this block w/ the code below
.
1347 if (!this.attr_("animatedZooms")) {
1348 this.dateWindow_
= null;
1349 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1350 if (this.axes_
[i
].valueWindow
!= null) {
1351 delete this.axes_
[i
].valueWindow
;
1355 if (this.attr_("zoomCallback")) {
1356 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1361 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1363 oldWindow
= this.xAxisRange();
1364 newWindow
= [minDate
, maxDate
];
1368 oldValueRanges
= this.yAxisRanges();
1369 // TODO(danvk): this is pretty inefficient
1370 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1371 var extremes
= packed
[1];
1373 // this has the side-effect of modifying this.axes_.
1374 // this doesn't make much sense in this context, but it's convenient (we
1375 // need this.axes_[*].extremeValues) and not harmful since we'll be
1376 // calling drawGraph_ shortly, which clobbers these values.
1377 this.computeYAxisRanges_(extremes
);
1379 newValueRanges
= [];
1380 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1381 newValueRanges
.push(this.axes_
[i
].extremeRange
);
1386 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1388 that
.dateWindow_
= null;
1389 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1390 if (that
.axes_
[i
].valueWindow
!= null) {
1391 delete that
.axes_
[i
].valueWindow
;
1394 if (that
.attr_("zoomCallback")) {
1395 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1402 * Combined animation logic for all zoom functions.
1403 * either the x parameters or y parameters may be null.
1406 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1407 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1410 var valueRanges
= [];
1412 if (oldXRange
!= null && newXRange
!= null) {
1413 for (var step
= 1; step
<= steps
; step
++) {
1414 var frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1415 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1416 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1420 if (oldYRanges
!= null && newYRanges
!= null) {
1421 for (var step
= 1; step
<= steps
; step
++) {
1422 var frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1424 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1425 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1426 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1428 valueRanges
[step
-1] = thisRange
;
1433 Dygraph
.repeatAndCleanup(function(step
) {
1434 if (valueRanges
.length
) {
1435 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1436 var w
= valueRanges
[step
][i
];
1437 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1440 if (windows
.length
) {
1441 that
.dateWindow_
= windows
[step
];
1444 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1448 * When the mouse moves in the canvas, display information about a nearby data
1449 * point and draw dots over those points in the data series. This function
1450 * takes care of cleanup of previously-drawn dots.
1451 * @param {Object} event The mousemove event from the browser.
1454 Dygraph
.prototype.mouseMove_
= function(event
) {
1455 // This prevents JS errors when mousing over the canvas before data loads.
1456 var points
= this.layout_
.points
;
1457 if (points
=== undefined
) return;
1459 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1464 // Loop through all the points and find the date nearest to our current
1466 var minDist
= 1e+100;
1468 for (var i
= 0; i
< points
.length
; i
++) {
1469 var point
= points
[i
];
1470 if (point
== null) continue;
1471 var dist
= Math
.abs(point
.canvasx
- canvasx
);
1472 if (dist
> minDist
) continue;
1476 if (idx
>= 0) lastx
= points
[idx
].xval
;
1478 // Extract the points we've selected
1479 this.selPoints_
= [];
1480 var l
= points
.length
;
1481 if (!this.attr_("stackedGraph")) {
1482 for (var i
= 0; i
< l
; i
++) {
1483 if (points
[i
].xval
== lastx
) {
1484 this.selPoints_
.push(points
[i
]);
1488 // Need to 'unstack' points starting from the bottom
1489 var cumulative_sum
= 0;
1490 for (var i
= l
- 1; i
>= 0; i
--) {
1491 if (points
[i
].xval
== lastx
) {
1492 var p
= {}; // Clone the point since we modify it
1493 for (var k
in points
[i
]) {
1494 p
[k
] = points
[i
][k
];
1496 p
.yval
-= cumulative_sum
;
1497 cumulative_sum
+= p
.yval
;
1498 this.selPoints_
.push(p
);
1501 this.selPoints_
.reverse();
1504 if (this.attr_("highlightCallback")) {
1505 var px
= this.lastx_
;
1506 if (px
!== null && lastx
!= px
) {
1507 // only fire if the selected point has changed.
1508 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
, this.idxToRow_(idx
));
1512 // Save last x position for callbacks.
1513 this.lastx_
= lastx
;
1515 this.updateSelection_();
1519 * Transforms layout_.points index into data row number.
1520 * @param int layout_.points index
1521 * @return int row number, or -1 if none could be found.
1524 Dygraph
.prototype.idxToRow_
= function(idx
) {
1525 if (idx
< 0) return -1;
1527 for (var i
in this.layout_
.datasets
) {
1528 if (idx
< this.layout_
.datasets
[i
].length
) {
1529 return this.boundaryIds_
[0][0]+idx
;
1531 idx
-= this.layout_
.datasets
[i
].length
;
1538 * Generates HTML for the legend which is displayed when hovering over the
1539 * chart. If no selected points are specified, a default legend is returned
1540 * (this may just be the empty string).
1541 * @param { Number } [x] The x-value of the selected points.
1542 * @param { [Object] } [sel_points] List of selected points for the given
1543 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1545 Dygraph
.prototype.generateLegendHTML_
= function(x
, sel_points
) {
1546 // If no points are selected, we display a default legend. Traditionally,
1547 // this has been blank. But a better default would be a conventional legend,
1548 // which provides essential information for a non-interactive chart.
1549 if (typeof(x
) === 'undefined') {
1550 if (this.attr_('legend') != 'always') return '';
1552 var sepLines
= this.attr_('labelsSeparateLines');
1553 var labels
= this.attr_('labels');
1555 for (var i
= 1; i
< labels
.length
; i
++) {
1556 if (!this.visibility()[i
- 1]) continue;
1557 var c
= this.plotter_
.colors
[labels
[i
]];
1558 if (html
!= '') html
+= (sepLines
? '<br/>' : ' ');
1559 html
+= "<b><span style='color: " + c
+ ";'>—" + labels
[i
] +
1565 var xOptView
= this.optionsViewForAxis_('x');
1566 var xvf
= xOptView('valueFormatter');
1567 var html
= xvf(x
, xOptView
, this.attr_('labels')[0], this) + ":";
1570 var num_axes
= this.numAxes();
1571 for (var i
= 0; i
< num_axes
; i
++) {
1572 yOptViews
[i
] = this.optionsViewForAxis_('y' + (i
? 1 + i
: ''));
1574 var showZeros
= this.attr_("labelsShowZeroValues");
1575 var sepLines
= this.attr_("labelsSeparateLines");
1576 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1577 var pt
= this.selPoints_
[i
];
1578 if (pt
.yval
== 0 && !showZeros
) continue;
1579 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1580 if (sepLines
) html
+= "<br/>";
1582 var yOptView
= yOptViews
[this.seriesToAxisMap_
[pt
.name
]];
1583 var fmtFunc
= yOptView('valueFormatter');
1584 var c
= this.plotter_
.colors
[pt
.name
];
1585 var yval
= fmtFunc(pt
.yval
, yOptView
, pt
.name
, this);
1587 // TODO(danvk): use a template string here and make it an attribute.
1588 html
+= " <b><span style='color: " + c
+ ";'>"
1589 + pt
.name
+ "</span></b>:"
1597 * Displays information about the selected points in the legend. If there is no
1598 * selection, the legend will be cleared.
1599 * @param { Number } [x] The x-value of the selected points.
1600 * @param { [Object] } [sel_points] List of selected points for the given
1601 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1603 Dygraph
.prototype.setLegendHTML_
= function(x
, sel_points
) {
1604 var html
= this.generateLegendHTML_(x
, sel_points
);
1605 var labelsDiv
= this.attr_("labelsDiv");
1606 if (labelsDiv
!== null) {
1607 labelsDiv
.innerHTML
= html
;
1609 if (typeof(this.shown_legend_error_
) == 'undefined') {
1610 this.error('labelsDiv is set to something nonexistent; legend will not be shown.');
1611 this.shown_legend_error_
= true;
1617 * Draw dots over the selectied points in the data series. This function
1618 * takes care of cleanup of previously-drawn dots.
1621 Dygraph
.prototype.updateSelection_
= function() {
1622 // Clear the previously drawn vertical, if there is one
1623 var ctx
= this.canvas_ctx_
;
1624 if (this.previousVerticalX_
>= 0) {
1625 // Determine the maximum highlight circle size.
1626 var maxCircleSize
= 0;
1627 var labels
= this.attr_('labels');
1628 for (var i
= 1; i
< labels
.length
; i
++) {
1629 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1630 if (r
> maxCircleSize
) maxCircleSize
= r
;
1632 var px
= this.previousVerticalX_
;
1633 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1634 2 * maxCircleSize
+ 2, this.height_
);
1637 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1638 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1641 if (this.selPoints_
.length
> 0) {
1642 // Set the status message to indicate the selected point(s)
1643 if (this.attr_('showLabelsOnHighlight')) {
1644 this.setLegendHTML_(this.lastx_
, this.selPoints_
);
1647 // Draw colored circles over the center of each selected point
1648 var canvasx
= this.selPoints_
[0].canvasx
;
1650 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1651 var pt
= this.selPoints_
[i
];
1652 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1654 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1656 ctx
.fillStyle
= this.plotter_
.colors
[pt
.name
];
1657 ctx
.arc(canvasx
, pt
.canvasy
, circleSize
, 0, 2 * Math
.PI
, false);
1662 this.previousVerticalX_
= canvasx
;
1667 * Manually set the selected points and display information about them in the
1668 * legend. The selection can be cleared using clearSelection() and queried
1669 * using getSelection().
1670 * @param { Integer } row number that should be highlighted (i.e. appear with
1671 * hover dots on the chart). Set to false to clear any selection.
1673 Dygraph
.prototype.setSelection
= function(row
) {
1674 // Extract the points we've selected
1675 this.selPoints_
= [];
1678 if (row
!== false) {
1679 row
= row
- this.boundaryIds_
[0][0];
1682 if (row
!== false && row
>= 0) {
1683 for (var i
in this.layout_
.datasets
) {
1684 if (row
< this.layout_
.datasets
[i
].length
) {
1685 var point
= this.layout_
.points
[pos
+row
];
1687 if (this.attr_("stackedGraph")) {
1688 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1691 this.selPoints_
.push(point
);
1693 pos
+= this.layout_
.datasets
[i
].length
;
1697 if (this.selPoints_
.length
) {
1698 this.lastx_
= this.selPoints_
[0].xval
;
1699 this.updateSelection_();
1701 this.clearSelection();
1707 * The mouse has left the canvas. Clear out whatever artifacts remain
1708 * @param {Object} event the mouseout event from the browser.
1711 Dygraph
.prototype.mouseOut_
= function(event
) {
1712 if (this.attr_("unhighlightCallback")) {
1713 this.attr_("unhighlightCallback")(event
);
1716 if (this.attr_("hideOverlayOnMouseOut")) {
1717 this.clearSelection();
1722 * Clears the current selection (i.e. points that were highlighted by moving
1723 * the mouse over the chart).
1725 Dygraph
.prototype.clearSelection
= function() {
1726 // Get rid of the overlay data
1727 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
1728 this.setLegendHTML_();
1729 this.selPoints_
= [];
1734 * Returns the number of the currently selected row. To get data for this row,
1735 * you can use the getValue method.
1736 * @return { Integer } row number, or -1 if nothing is selected
1738 Dygraph
.prototype.getSelection
= function() {
1739 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1743 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1744 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1745 return row
+ this.boundaryIds_
[0][0];
1752 * Fires when there's data available to be graphed.
1753 * @param {String} data Raw CSV data to be plotted
1756 Dygraph
.prototype.loadedEvent_
= function(data
) {
1757 this.rawData_
= this.parseCSV_(data
);
1762 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1765 Dygraph
.prototype.addXTicks_
= function() {
1766 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1768 if (this.dateWindow_
) {
1769 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
1771 range
= this.fullXRange_();
1774 var xAxisOptionsView
= this.optionsViewForAxis_('x');
1775 var xTicks
= xAxisOptionsView('ticker')(
1778 this.width_
, // TODO(danvk): should be area.width
1781 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
1782 // console.log(msg);
1783 this.layout_
.setXTicks(xTicks
);
1788 * Computes the range of the data series (including confidence intervals).
1789 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
1790 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1791 * @return [low, high]
1793 Dygraph
.prototype.extremeValues_
= function(series
) {
1794 var minY
= null, maxY
= null;
1796 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1798 // With custom bars, maxY is the max of the high values.
1799 for (var j
= 0; j
< series
.length
; j
++) {
1800 var y
= series
[j
][1][0];
1802 var low
= y
- series
[j
][1][1];
1803 var high
= y
+ series
[j
][1][2];
1804 if (low
> y
) low
= y
; // this can happen with custom bars,
1805 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1806 if (maxY
== null || high
> maxY
) {
1809 if (minY
== null || low
< minY
) {
1814 for (var j
= 0; j
< series
.length
; j
++) {
1815 var y
= series
[j
][1];
1816 if (y
=== null || isNaN(y
)) continue;
1817 if (maxY
== null || y
> maxY
) {
1820 if (minY
== null || y
< minY
) {
1826 return [minY
, maxY
];
1831 * This function is called once when the chart's data is changed or the options
1832 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1833 * idea is that values derived from the chart's data can be computed here,
1834 * rather than every time the chart is drawn. This includes things like the
1835 * number of axes, rolling averages, etc.
1837 Dygraph
.prototype.predraw_
= function() {
1838 var start
= new Date();
1840 // TODO(danvk): move more computations out of drawGraph_ and into here.
1841 this.computeYAxes_();
1843 // Create a new plotter.
1844 if (this.plotter_
) this.plotter_
.clear();
1845 this.plotter_
= new DygraphCanvasRenderer(this,
1850 // The roller sits in the bottom left corner of the chart. We don't know where
1851 // this will be until the options are available, so it's positioned here.
1852 this.createRollInterface_();
1854 // Same thing applies for the labelsDiv. It's right edge should be flush with
1855 // the right edge of the charting area (which may not be the same as the right
1856 // edge of the div, if we have two y-axes.
1857 this.positionLabelsDiv_();
1859 if (this.rangeSelector_
) {
1860 this.rangeSelector_
.renderStaticLayer();
1863 // Convert the raw data (a 2D array) into the internal format and compute
1864 // rolling averages.
1865 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
1866 for (var i
= 1; i
< this.numColumns(); i
++) {
1867 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
1868 var logScale
= this.attr_('logscale', i
);
1869 var series
= this.extractSeries_(this.rawData_
, i
, logScale
, connectSeparatedPoints
);
1870 series
= this.rollingAverage(series
, this.rollPeriod_
);
1871 this.rolledSeries_
.push(series
);
1874 // If the data or options have changed, then we'd better redraw.
1877 // This is used to determine whether to do various animations.
1878 var end
= new Date();
1879 this.drawingTimeMs_
= (end
- start
);
1883 * Loop over all fields and create datasets, calculating extreme y-values for
1884 * each series and extreme x-indices as we go.
1886 * dateWindow is passed in as an explicit parameter so that we can compute
1887 * extreme values "speculatively", i.e. without actually setting state on the
1890 * TODO(danvk): make this more of a true function
1891 * @return [ datasets, seriesExtremes, boundaryIds ]
1894 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
1895 var boundaryIds
= [];
1896 var cumulative_y
= []; // For stacked series.
1898 var extremes
= {}; // series name -> [low, high]
1900 // Loop over the fields (series). Go from the last to the first,
1901 // because if they're stacked that's how we accumulate the values.
1902 var num_series
= rolledSeries
.length
- 1;
1903 for (var i
= num_series
; i
>= 1; i
--) {
1904 if (!this.visibility()[i
- 1]) continue;
1906 // TODO(danvk): is this copy really necessary?
1908 for (var j
= 0; j
< rolledSeries
[i
].length
; j
++) {
1909 series
.push(rolledSeries
[i
][j
]);
1912 // Prune down to the desired range, if necessary (for zooming)
1913 // Because there can be lines going to points outside of the visible area,
1914 // we actually prune to visible points, plus one on either side.
1915 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1917 var low
= dateWindow
[0];
1918 var high
= dateWindow
[1];
1920 // TODO(danvk): do binary search instead of linear search.
1921 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1922 var firstIdx
= null, lastIdx
= null;
1923 for (var k
= 0; k
< series
.length
; k
++) {
1924 if (series
[k
][0] >= low
&& firstIdx
=== null) {
1927 if (series
[k
][0] <= high
) {
1931 if (firstIdx
=== null) firstIdx
= 0;
1932 if (firstIdx
> 0) firstIdx
--;
1933 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
1934 if (lastIdx
< series
.length
- 1) lastIdx
++;
1935 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
1936 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
1937 pruned
.push(series
[k
]);
1941 boundaryIds
[i
-1] = [0, series
.length
-1];
1944 var seriesExtremes
= this.extremeValues_(series
);
1947 for (var j
=0; j
<series
.length
; j
++) {
1948 series
[j
] = [series
[j
][0],
1953 } else if (this.attr_("stackedGraph")) {
1954 var l
= series
.length
;
1956 for (var j
= 0; j
< l
; j
++) {
1957 // If one data set has a NaN, let all subsequent stacked
1958 // sets inherit the NaN -- only start at 0 for the first set.
1959 var x
= series
[j
][0];
1960 if (cumulative_y
[x
] === undefined
) {
1961 cumulative_y
[x
] = 0;
1964 actual_y
= series
[j
][1];
1965 cumulative_y
[x
] += actual_y
;
1967 series
[j
] = [x
, cumulative_y
[x
]]
1969 if (cumulative_y
[x
] > seriesExtremes
[1]) {
1970 seriesExtremes
[1] = cumulative_y
[x
];
1972 if (cumulative_y
[x
] < seriesExtremes
[0]) {
1973 seriesExtremes
[0] = cumulative_y
[x
];
1978 var seriesName
= this.attr_("labels")[i
];
1979 extremes
[seriesName
] = seriesExtremes
;
1980 datasets
[i
] = series
;
1983 return [ datasets
, extremes
, boundaryIds
];
1987 * Update the graph with new data. This method is called when the viewing area
1988 * has changed. If the underlying data or options have changed, predraw_ will
1989 * be called before drawGraph_ is called.
1991 * clearSelection, when undefined or true, causes this.clearSelection to be
1992 * called at the end of the draw operation. This should rarely be defined,
1993 * and never true (that is it should be undefined most of the time, and
1998 Dygraph
.prototype.drawGraph_
= function(clearSelection
) {
1999 var start
= new Date();
2001 if (typeof(clearSelection
) === 'undefined') {
2002 clearSelection
= true;
2005 // This is used to set the second parameter to drawCallback, below.
2006 var is_initial_draw
= this.is_initial_draw_
;
2007 this.is_initial_draw_
= false;
2009 var minY
= null, maxY
= null;
2010 this.layout_
.removeAllDatasets();
2012 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
2014 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2015 var datasets
= packed
[0];
2016 var extremes
= packed
[1];
2017 this.boundaryIds_
= packed
[2];
2019 for (var i
= 1; i
< datasets
.length
; i
++) {
2020 if (!this.visibility()[i
- 1]) continue;
2021 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
2024 this.computeYAxisRanges_(extremes
);
2025 this.layout_
.setYAxes(this.axes_
);
2029 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2030 var tmp_zoomed_x
= this.zoomed_x_
;
2031 // Tell PlotKit to use this new data and render itself
2032 this.layout_
.setDateWindow(this.dateWindow_
);
2033 this.zoomed_x_
= tmp_zoomed_x
;
2034 this.layout_
.evaluateWithError();
2035 this.renderGraph_(is_initial_draw
, false);
2037 if (this.attr_("timingName")) {
2038 var end
= new Date();
2040 console
.log(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms")
2045 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
, clearSelection
) {
2046 this.plotter_
.clear();
2047 this.plotter_
.render();
2048 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2049 this.canvas_
.height
);
2051 if (is_initial_draw
) {
2052 // Generate a static legend before any particular point is selected.
2053 this.setLegendHTML_();
2055 if (clearSelection
) {
2056 if (typeof(this.selPoints_
) !== 'undefined' && this.selPoints_
.length
) {
2057 // We should select the point nearest the page x/y here
, but it
's easier
2058 // to just clear the selection. This prevents erroneous hover dots from
2060 this.clearSelection();
2062 this.clearSelection();
2067 if (this.rangeSelector_) {
2068 this.rangeSelector_.renderInteractiveLayer();
2071 if (this.attr_("drawCallback") !== null) {
2072 this.attr_("drawCallback")(this, is_initial_draw);
2078 * Determine properties of the y-axes which are independent of the data
2079 * currently being displayed. This includes things like the number of axes and
2080 * the style of the axes. It does not include the range of each axis and its
2082 * This fills in this.axes_ and this.seriesToAxisMap_.
2083 * axes_ = [ { options } ]
2084 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2085 * indices are into the axes_ array.
2087 Dygraph.prototype.computeYAxes_ = function() {
2088 // Preserve valueWindow settings if they exist, and if the user hasn't
2089 // specified a new valueRange.
2091 if (this.axes_
!= undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") == false) {
2093 for (var index
= 0; index
< this.axes_
.length
; index
++) {
2094 valueWindows
.push(this.axes_
[index
].valueWindow
);
2098 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2099 this.seriesToAxisMap_
= {};
2101 // Get a list of series names.
2102 var labels
= this.attr_("labels");
2104 for (var i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2106 // all options which could be applied per-axis:
2114 'axisLabelFontSize',
2119 // Copy global axis options over to the first axis.
2120 for (var i
= 0; i
< axisOptions
.length
; i
++) {
2121 var k
= axisOptions
[i
];
2122 var v
= this.attr_(k
);
2123 if (v
) this.axes_
[0][k
] = v
;
2126 // Go through once and add all the axes.
2127 for (var seriesName
in series
) {
2128 if (!series
.hasOwnProperty(seriesName
)) continue;
2129 var axis
= this.attr_("axis", seriesName
);
2131 this.seriesToAxisMap_
[seriesName
] = 0;
2134 if (typeof(axis
) == 'object') {
2135 // Add a new axis, making a copy of its per-axis options.
2137 Dygraph
.update(opts
, this.axes_
[0]);
2138 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2139 var yAxisId
= this.axes_
.length
;
2140 opts
.yAxisId
= yAxisId
;
2142 Dygraph
.update(opts
, axis
);
2143 this.axes_
.push(opts
);
2144 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2148 // Go through one more time and assign series to an axis defined by another
2149 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2150 for (var seriesName
in series
) {
2151 if (!series
.hasOwnProperty(seriesName
)) continue;
2152 var axis
= this.attr_("axis", seriesName
);
2153 if (typeof(axis
) == 'string') {
2154 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2155 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2156 "series " + axis
+ ", which does not define its own axis.");
2159 var idx
= this.seriesToAxisMap_
[axis
];
2160 this.seriesToAxisMap_
[seriesName
] = idx
;
2164 if (valueWindows
!= undefined
) {
2165 // Restore valueWindow settings.
2166 for (var index
= 0; index
< valueWindows
.length
; index
++) {
2167 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2173 * Returns the number of y-axes on the chart.
2174 * @return {Number} the number of axes.
2176 Dygraph
.prototype.numAxes
= function() {
2178 for (var series
in this.seriesToAxisMap_
) {
2179 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2180 var idx
= this.seriesToAxisMap_
[series
];
2181 if (idx
> last_axis
) last_axis
= idx
;
2183 return 1 + last_axis
;
2188 * Returns axis properties for the given series.
2189 * @param { String } setName The name of the series for which to get axis
2190 * properties, e.g. 'Y1'.
2191 * @return { Object } The axis properties.
2193 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2194 // TODO(danvk): handle errors.
2195 return this.axes_
[this.seriesToAxisMap_
[series
]];
2200 * Determine the value range and tick marks for each axis.
2201 * @param {Object} extremes A mapping from seriesName -> [low, high]
2202 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2204 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2205 // Build a map from axis number -> [list of series names]
2206 var seriesForAxis
= [];
2207 for (var series
in this.seriesToAxisMap_
) {
2208 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2209 var idx
= this.seriesToAxisMap_
[series
];
2210 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2211 seriesForAxis
[idx
].push(series
);
2214 // Compute extreme values, a span and tick marks for each axis.
2215 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2216 var axis
= this.axes_
[i
];
2218 if (!seriesForAxis
[i
]) {
2219 // If no series are defined or visible then use a reasonable default
2220 axis
.extremeRange
= [0, 1];
2222 // Calculate the extremes of extremes.
2223 var series
= seriesForAxis
[i
];
2224 var minY
= Infinity
; // extremes[series[0]][0];
2225 var maxY
= -Infinity
; // extremes[series[0]][1];
2226 var extremeMinY
, extremeMaxY
;
2228 for (var j
= 0; j
< series
.length
; j
++) {
2229 // this skips invisible series
2230 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2232 // Only use valid extremes to stop null data series' from corrupting the scale.
2233 extremeMinY
= extremes
[series
[j
]][0];
2234 if (extremeMinY
!= null) {
2235 minY
= Math
.min(extremeMinY
, minY
);
2237 extremeMaxY
= extremes
[series
[j
]][1];
2238 if (extremeMaxY
!= null) {
2239 maxY
= Math
.max(extremeMaxY
, maxY
);
2242 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2244 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2245 if (minY
== Infinity
) minY
= 0;
2246 if (maxY
== -Infinity
) maxY
= 1;
2248 // Add some padding and round up to an integer to be human-friendly.
2249 var span
= maxY
- minY
;
2250 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2251 if (span
== 0) { span
= maxY
; }
2255 if (axis
.logscale
) {
2256 var maxAxisY
= maxY
+ 0.1 * span
;
2257 var minAxisY
= minY
;
2259 var maxAxisY
= maxY
+ 0.1 * span
;
2260 var minAxisY
= minY
- 0.1 * span
;
2262 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2263 if (!this.attr_("avoidMinZero")) {
2264 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2265 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2268 if (this.attr_("includeZero")) {
2269 if (maxY
< 0) maxAxisY
= 0;
2270 if (minY
> 0) minAxisY
= 0;
2273 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2275 if (axis
.valueWindow
) {
2276 // This is only set if the user has zoomed on the y-axis. It is never set
2277 // by a user. It takes precedence over axis.valueRange because, if you set
2278 // valueRange, you'd still expect to be able to pan.
2279 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2280 } else if (axis
.valueRange
) {
2281 // This is a user-set value range for this axis.
2282 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2284 axis
.computedValueRange
= axis
.extremeRange
;
2287 // Add ticks. By default, all axes inherit the tick positions of the
2288 // primary axis. However, if an axis is specifically marked as having
2289 // independent ticks, then that is permissible as well.
2290 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2291 var ticker
= opts('ticker');
2292 if (i
== 0 || axis
.independentTicks
) {
2293 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2294 axis
.computedValueRange
[1],
2295 this.height_
, // TODO(danvk): should be area.height
2299 var p_axis
= this.axes_
[0];
2300 var p_ticks
= p_axis
.ticks
;
2301 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2302 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2303 var tick_values
= [];
2304 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2305 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2306 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2307 tick_values
.push(y_val
);
2310 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2311 axis
.computedValueRange
[1],
2312 this.height_
, // TODO(danvk): should be area.height
2321 * Extracts one series from the raw data (a 2D array) into an array of (date,
2324 * This is where undesirable points (i.e. negative values on log scales and
2325 * missing values through which we wish to connect lines) are dropped.
2329 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
, connectSeparatedPoints
) {
2331 for (var j
= 0; j
< rawData
.length
; j
++) {
2332 var x
= rawData
[j
][0];
2333 var point
= rawData
[j
][i
];
2335 // On the log scale, points less than zero do not exist.
2336 // This will create a gap in the chart. Note that this ignores
2337 // connectSeparatedPoints.
2341 series
.push([x
, point
]);
2343 if (point
!= null || !connectSeparatedPoints
) {
2344 series
.push([x
, point
]);
2353 * Calculates the rolling average of a data set.
2354 * If originalData is [label, val], rolls the average of those.
2355 * If originalData is [label, [, it's interpreted as [value, stddev]
2356 * and the roll is returned in the same form, with appropriately reduced
2357 * stddev for each value.
2358 * Note that this is where fractional input (i.e. '5/10') is converted into
2360 * @param {Array} originalData The data in the appropriate format (see above)
2361 * @param {Number} rollPeriod The number of points over which to average the
2364 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2365 if (originalData
.length
< 2)
2366 return originalData
;
2367 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2368 var rollingData
= [];
2369 var sigma
= this.attr_("sigma");
2371 if (this.fractions_
) {
2373 var den
= 0; // numerator/denominator
2375 for (var i
= 0; i
< originalData
.length
; i
++) {
2376 num
+= originalData
[i
][1][0];
2377 den
+= originalData
[i
][1][1];
2378 if (i
- rollPeriod
>= 0) {
2379 num
-= originalData
[i
- rollPeriod
][1][0];
2380 den
-= originalData
[i
- rollPeriod
][1][1];
2383 var date
= originalData
[i
][0];
2384 var value
= den
? num
/ den
: 0.0;
2385 if (this.attr_("errorBars")) {
2386 if (this.attr_("wilsonInterval")) {
2387 // For more details on this confidence interval, see:
2388 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2390 var p
= value
< 0 ? 0 : value
, n
= den
;
2391 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2392 var denom
= 1 + sigma
* sigma
/ den
;
2393 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2394 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2395 rollingData
[i
] = [date
,
2396 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2398 rollingData
[i
] = [date
, [0, 0, 0]];
2401 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2402 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2405 rollingData
[i
] = [date
, mult
* value
];
2408 } else if (this.attr_("customBars")) {
2413 for (var i
= 0; i
< originalData
.length
; i
++) {
2414 var data
= originalData
[i
][1];
2416 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2418 if (y
!= null && !isNaN(y
)) {
2424 if (i
- rollPeriod
>= 0) {
2425 var prev
= originalData
[i
- rollPeriod
];
2426 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
2434 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2435 1.0 * (mid
- low
) / count
,
2436 1.0 * (high
- mid
) / count
]];
2438 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2442 // Calculate the rolling average for the first rollPeriod - 1 points where
2443 // there is not enough data to roll over the full number of points
2444 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
2445 if (!this.attr_("errorBars")){
2446 if (rollPeriod
== 1) {
2447 return originalData
;
2450 for (var i
= 0; i
< originalData
.length
; i
++) {
2453 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2454 var y
= originalData
[j
][1];
2455 if (y
== null || isNaN(y
)) continue;
2457 sum
+= originalData
[j
][1];
2460 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2462 rollingData
[i
] = [originalData
[i
][0], null];
2467 for (var i
= 0; i
< originalData
.length
; i
++) {
2471 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2472 var y
= originalData
[j
][1][0];
2473 if (y
== null || isNaN(y
)) continue;
2475 sum
+= originalData
[j
][1][0];
2476 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2479 var stddev
= Math
.sqrt(variance
) / num_ok
;
2480 rollingData
[i
] = [originalData
[i
][0],
2481 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2483 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2493 * Detects the type of the str (date or numeric) and sets the various
2494 * formatting attributes in this.attrs_ based on this type.
2495 * @param {String} str An x value.
2498 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2500 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2501 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2502 str
.indexOf('/') >= 0 ||
2503 isNaN(parseFloat(str
))) {
2505 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2506 // TODO(danvk): remove support for this format.
2511 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2512 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2513 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2514 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2516 /** @private (shut up, jsdoc!) */
2517 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2518 // TODO(danvk): use Dygraph.numberValueFormatter here?
2519 /** @private (shut up, jsdoc!) */
2520 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2521 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2522 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2527 * Parses the value as a floating point number. This is like the parseFloat()
2528 * built-in, but with a few differences:
2529 * - the empty string is parsed as null, rather than NaN.
2530 * - if the string cannot be parsed at all, an error is logged.
2531 * If the string can't be parsed, this method returns null.
2532 * @param {String} x The string to be parsed
2533 * @param {Number} opt_line_no The line number from which the string comes.
2534 * @param {String} opt_line The text of the line from which the string comes.
2538 // Parse the x as a float or return null if it's not a number.
2539 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2540 var val
= parseFloat(x
);
2541 if (!isNaN(val
)) return val
;
2543 // Try to figure out what happeend.
2544 // If the value is the empty string, parse it as null.
2545 if (/^ *$/.test(x
)) return null;
2547 // If it was actually "NaN", return it as NaN.
2548 if (/^ *nan *$/i.test(x
)) return NaN
;
2550 // Looks like a parsing error.
2551 var msg
= "Unable to parse '" + x
+ "' as a number";
2552 if (opt_line
!== null && opt_line_no
!== null) {
2553 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2562 * Parses a string in a special csv format. We expect a csv file where each
2563 * line is a date point, and the first field in each line is the date string.
2564 * We also expect that all remaining fields represent series.
2565 * if the errorBars attribute is set, then interpret the fields as:
2566 * date, series1, stddev1, series2, stddev2, ...
2567 * @param {[Object]} data See above.
2569 * @return [Object] An array with one entry for each row. These entries
2570 * are an array of cells in that row. The first entry is the parsed x-value for
2571 * the row. The second, third, etc. are the y-values. These can take on one of
2572 * three forms, depending on the CSV and constructor parameters:
2574 * 2. [ value, stddev ]
2575 * 3. [ low value, center value, high value ]
2577 Dygraph
.prototype.parseCSV_
= function(data
) {
2579 var lines
= data
.split("\n");
2581 // Use the default delimiter or fall back to a tab if that makes sense.
2582 var delim
= this.attr_('delimiter');
2583 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2588 if (!('labels' in this.user_attrs_
)) {
2589 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2591 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2596 var defaultParserSet
= false; // attempt to auto-detect x value type
2597 var expectedCols
= this.attr_("labels").length
;
2598 var outOfOrder
= false;
2599 for (var i
= start
; i
< lines
.length
; i
++) {
2600 var line
= lines
[i
];
2602 if (line
.length
== 0) continue; // skip blank lines
2603 if (line
[0] == '#') continue; // skip comment lines
2604 var inFields
= line
.split(delim
);
2605 if (inFields
.length
< 2) continue;
2608 if (!defaultParserSet
) {
2609 this.detectTypeFromString_(inFields
[0]);
2610 xParser
= this.attr_("xValueParser");
2611 defaultParserSet
= true;
2613 fields
[0] = xParser(inFields
[0], this);
2615 // If fractions are expected, parse the numbers as "A/B
"
2616 if (this.fractions_) {
2617 for (var j = 1; j < inFields.length; j++) {
2618 // TODO(danvk): figure out an appropriate way to flag parse errors.
2619 var vals = inFields[j].split("/");
2620 if (vals.length != 2) {
2621 this.error('Expected fractional "num
/den
" values in CSV data ' +
2622 "but found a value
'" + inFields[j] + "' on line
" +
2623 (1 + i) + " ('" + line + "') which is not of
this form
.");
2626 fields[j] = [this.parseFloat_(vals[0], i, line),
2627 this.parseFloat_(vals[1], i, line)];
2630 } else if (this.attr_("errorBars
")) {
2631 // If there are error bars, values are (value, stddev) pairs
2632 if (inFields.length % 2 != 1) {
2633 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2634 'but line ' + (1 + i) + ' has an odd number of values (' +
2635 (inFields.length - 1) + "): '" + line + "'");
2637 for (var j = 1; j < inFields.length; j += 2) {
2638 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2639 this.parseFloat_(inFields[j + 1], i, line)];
2641 } else if (this.attr_("customBars
")) {
2642 // Bars are a low;center;high tuple
2643 for (var j = 1; j < inFields.length; j++) {
2644 var val = inFields[j];
2645 if (/^ *$/.test(val)) {
2646 fields[j] = [null, null, null];
2648 var vals = val.split(";");
2649 if (vals.length == 3) {
2650 fields[j] = [ this.parseFloat_(vals[0], i, line),
2651 this.parseFloat_(vals[1], i, line),
2652 this.parseFloat_(vals[2], i, line) ];
2654 this.warning('When using customBars, values must be either blank ' +
2655 'or "low
;center
;high
" tuples (got "' + val +
2656 '" on line ' + (1+i));
2661 // Values are just numbers
2662 for (var j = 1; j < inFields.length; j++) {
2663 fields[j] = this.parseFloat_(inFields[j], i, line);
2666 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2670 if (fields.length != expectedCols) {
2671 this.error("Number of columns
in line
" + i + " (" + fields.length +
2672 ") does not agree
with number of
labels (" + expectedCols +
2676 // If the user specified the 'labels' option and none of the cells of the
2677 // first row parsed correctly, then they probably double-specified the
2678 // labels. We go with the values set in the option, discard this row and
2679 // log a warning to the JS console.
2680 if (i == 0 && this.attr_('labels')) {
2681 var all_null = true;
2682 for (var j = 0; all_null && j < fields.length; j++) {
2683 if (fields[j]) all_null = false;
2686 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2687 "CSV
data ('" + line + "') appears to also contain labels
. " +
2688 "Will drop the CSV labels and
use the option labels
.");
2696 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2697 ret.sort(function(a,b) { return a[0] - b[0] });
2705 * The user has provided their data as a pre-packaged JS array. If the x values
2706 * are numeric, this is the same as dygraphs' internal format. If the x values
2707 * are dates, we need to convert them from Date objects to ms since epoch.
2708 * @param {[Object]} data
2709 * @return {[Object]} data with numeric x values.
2711 Dygraph.prototype.parseArray_ = function(data) {
2712 // Peek at the first x value to see if it's numeric.
2713 if (data.length == 0) {
2714 this.error("Can
't plot empty data set");
2717 if (data[0].length == 0) {
2718 this.error("Data set cannot contain an empty row");
2722 if (this.attr_("labels") == null) {
2723 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2724 "in the options parameter");
2725 this.attrs_.labels = [ "X" ];
2726 for (var i = 1; i < data[0].length; i++) {
2727 this.attrs_.labels.push("Y" + i);
2731 if (Dygraph.isDateLike(data[0][0])) {
2732 // Some intelligent defaults for a date x-axis.
2733 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
2734 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
2735 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
2737 // Assume they're all dates
.
2738 var parsedData
= Dygraph
.clone(data
);
2739 for (var i
= 0; i
< data
.length
; i
++) {
2740 if (parsedData
[i
].length
== 0) {
2741 this.error("Row " + (1 + i
) + " of data is empty");
2744 if (parsedData
[i
][0] == null
2745 || typeof(parsedData
[i
][0].getTime
) != 'function'
2746 || isNaN(parsedData
[i
][0].getTime())) {
2747 this.error("x value in row " + (1 + i
) + " is not a Date");
2750 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2754 // Some intelligent defaults for a numeric x-axis.
2755 /** @private (shut up, jsdoc!) */
2756 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2757 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
2758 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2764 * Parses a DataTable object from gviz.
2765 * The data is expected to have a first column that is either a date or a
2766 * number. All subsequent columns must be numbers. If there is a clear mismatch
2767 * between this.xValueParser_ and the type of the first column, it will be
2768 * fixed. Fills out rawData_.
2769 * @param {[Object]} data See above.
2772 Dygraph
.prototype.parseDataTable_
= function(data
) {
2773 var cols
= data
.getNumberOfColumns();
2774 var rows
= data
.getNumberOfRows();
2776 var indepType
= data
.getColumnType(0);
2777 if (indepType
== 'date' || indepType
== 'datetime') {
2778 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2779 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2780 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2781 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2782 } else if (indepType
== 'number') {
2783 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2784 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2785 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericTicks
;
2786 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2788 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2789 "column 1 of DataTable input (Got '" + indepType
+ "')");
2793 // Array of the column indices which contain data (and not annotations).
2795 var annotationCols
= {}; // data index -> [annotation cols]
2796 var hasAnnotations
= false;
2797 for (var i
= 1; i
< cols
; i
++) {
2798 var type
= data
.getColumnType(i
);
2799 if (type
== 'number') {
2801 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2802 // This is OK -- it's an annotation column.
2803 var dataIdx
= colIdx
[colIdx
.length
- 1];
2804 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2805 annotationCols
[dataIdx
] = [i
];
2807 annotationCols
[dataIdx
].push(i
);
2809 hasAnnotations
= true;
2811 this.error("Only 'number' is supported as a dependent type with Gviz." +
2812 " 'string' is only supported if displayAnnotations is true");
2816 // Read column labels
2817 // TODO(danvk): add support back for errorBars
2818 var labels
= [data
.getColumnLabel(0)];
2819 for (var i
= 0; i
< colIdx
.length
; i
++) {
2820 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2821 if (this.attr_("errorBars")) i
+= 1;
2823 this.attrs_
.labels
= labels
;
2824 cols
= labels
.length
;
2827 var outOfOrder
= false;
2828 var annotations
= [];
2829 for (var i
= 0; i
< rows
; i
++) {
2831 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2832 data
.getValue(i
, 0) === null) {
2833 this.warn("Ignoring row " + i
+
2834 " of DataTable because of undefined or null first column.");
2838 if (indepType
== 'date' || indepType
== 'datetime') {
2839 row
.push(data
.getValue(i
, 0).getTime());
2841 row
.push(data
.getValue(i
, 0));
2843 if (!this.attr_("errorBars")) {
2844 for (var j
= 0; j
< colIdx
.length
; j
++) {
2845 var col
= colIdx
[j
];
2846 row
.push(data
.getValue(i
, col
));
2847 if (hasAnnotations
&&
2848 annotationCols
.hasOwnProperty(col
) &&
2849 data
.getValue(i
, annotationCols
[col
][0]) != null) {
2851 ann
.series
= data
.getColumnLabel(col
);
2853 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
2855 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2856 if (k
) ann
.text
+= "\n";
2857 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2859 annotations
.push(ann
);
2863 // Strip out infinities, which give dygraphs problems later on.
2864 for (var j
= 0; j
< row
.length
; j
++) {
2865 if (!isFinite(row
[j
])) row
[j
] = null;
2868 for (var j
= 0; j
< cols
- 1; j
++) {
2869 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2872 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2879 this.warn("DataTable is out of order; order it correctly to speed loading.");
2880 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
2882 this.rawData_
= ret
;
2884 if (annotations
.length
> 0) {
2885 this.setAnnotations(annotations
, true);
2890 * Get the CSV data. If it's in a function, call that function. If it's in a
2891 * file, do an XMLHttpRequest to get it.
2894 Dygraph
.prototype.start_
= function() {
2895 if (typeof this.file_
== 'function') {
2896 // CSV string. Pretend we got it via XHR.
2897 this.loadedEvent_(this.file_());
2898 } else if (Dygraph
.isArrayLike(this.file_
)) {
2899 this.rawData_
= this.parseArray_(this.file_
);
2901 } else if (typeof this.file_
== 'object' &&
2902 typeof this.file_
.getColumnRange
== 'function') {
2903 // must be a DataTable from gviz.
2904 this.parseDataTable_(this.file_
);
2906 } else if (typeof this.file_
== 'string') {
2907 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2908 if (this.file_
.indexOf('\n') >= 0) {
2909 this.loadedEvent_(this.file_
);
2911 var req
= new XMLHttpRequest();
2913 req
.onreadystatechange
= function () {
2914 if (req
.readyState
== 4) {
2915 if (req
.status
== 200 || // Normal http
2916 req
.status
== 0) { // Chrome w/ --allow
-file
-access
-from
-files
2917 caller
.loadedEvent_(req
.responseText
);
2922 req
.open("GET", this.file_
, true);
2926 this.error("Unknown data format: " + (typeof this.file_
));
2931 * Changes various properties of the graph. These can include:
2933 * <li>file: changes the source data for the graph</li>
2934 * <li>errorBars: changes whether the data contains stddev</li>
2937 * There's a huge variety of options that can be passed to this method. For a
2938 * full list, see http://dygraphs.com/options.html.
2940 * @param {Object} attrs The new properties and values
2941 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
2942 * call to updateOptions(). If you know better, you can pass true to explicitly
2943 * block the redraw. This can be useful for chaining updateOptions() calls,
2944 * avoiding the occasional infinite loop and preventing redraws when it's not
2945 * necessary (e.g. when updating a callback).
2947 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
2948 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
2950 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
2951 var file
= input_attrs
['file'];
2952 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
2954 // TODO(danvk): this is a mess. Move these options into attr_.
2955 if ('rollPeriod' in attrs
) {
2956 this.rollPeriod_
= attrs
.rollPeriod
;
2958 if ('dateWindow' in attrs
) {
2959 this.dateWindow_
= attrs
.dateWindow
;
2960 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
2961 this.zoomed_x_
= attrs
.dateWindow
!= null;
2964 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
2965 this.zoomed_y_
= attrs
.valueRange
!= null;
2968 // TODO(danvk): validate per-series options.
2973 // highlightCircleSize
2975 // Check if this set options will require new points.
2976 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
2978 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
2982 if (!block_redraw
) this.start_();
2984 if (!block_redraw
) {
2985 if (requiresNewPoints
) {
2988 this.renderGraph_(false, false);
2995 * Returns a copy of the options with deprecated names converted into current
2996 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
2997 * interested in that, they should save a copy before calling this.
3000 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3002 for (var k
in attrs
) {
3003 if (k
== 'file') continue;
3004 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3007 var set
= function(axis
, opt
, value
) {
3008 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3009 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3010 my_attrs
.axes
[axis
][opt
] = value
;
3012 var map
= function(opt
, axis
, new_opt
) {
3013 if (typeof(attrs
[opt
]) != 'undefined') {
3014 set(axis
, new_opt
, attrs
[opt
]);
3015 delete my_attrs
[opt
];
3019 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3020 map('xValueFormatter', 'x', 'valueFormatter');
3021 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3022 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3023 map('xTicker', 'x', 'ticker');
3024 map('yValueFormatter', 'y', 'valueFormatter');
3025 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3026 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3027 map('yTicker', 'y', 'ticker');
3032 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3033 * containing div (which has presumably changed size since the dygraph was
3034 * instantiated. If the width/height are specified, the div will be resized.
3036 * This is far more efficient than destroying and re-instantiating a
3037 * Dygraph, since it doesn't have to reparse the underlying data.
3039 * @param {Number} [width] Width (in pixels)
3040 * @param {Number} [height] Height (in pixels)
3042 Dygraph
.prototype.resize
= function(width
, height
) {
3043 if (this.resize_lock
) {
3046 this.resize_lock
= true;
3048 if ((width
=== null) != (height
=== null)) {
3049 this.warn("Dygraph.resize() should be called with zero parameters or " +
3050 "two non-NULL parameters. Pretending it was zero.");
3051 width
= height
= null;
3054 var old_width
= this.width_
;
3055 var old_height
= this.height_
;
3058 this.maindiv_
.style
.width
= width
+ "px";
3059 this.maindiv_
.style
.height
= height
+ "px";
3060 this.width_
= width
;
3061 this.height_
= height
;
3063 this.width_
= this.maindiv_
.clientWidth
;
3064 this.height_
= this.maindiv_
.clientHeight
;
3067 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3068 // TODO(danvk): there should be a clear() method.
3069 this.maindiv_
.innerHTML
= "";
3070 this.roller_
= null;
3071 this.attrs_
.labelsDiv
= null;
3072 this.createInterface_();
3073 if (this.annotations_
.length
) {
3074 // createInterface_ reset the layout, so we need to do this.
3075 this.layout_
.setAnnotations(this.annotations_
);
3080 this.resize_lock
= false;
3084 * Adjusts the number of points in the rolling average. Updates the graph to
3085 * reflect the new averaging period.
3086 * @param {Number} length Number of points over which to average the data.
3088 Dygraph
.prototype.adjustRoll
= function(length
) {
3089 this.rollPeriod_
= length
;
3094 * Returns a boolean array of visibility statuses.
3096 Dygraph
.prototype.visibility
= function() {
3097 // Do lazy-initialization, so that this happens after we know the number of
3099 if (!this.attr_("visibility")) {
3100 this.attrs_
["visibility"] = [];
3102 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3103 this.attr_("visibility").push(true);
3105 return this.attr_("visibility");
3109 * Changes the visiblity of a series.
3111 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3112 var x
= this.visibility();
3113 if (num
< 0 || num
>= x
.length
) {
3114 this.warn("invalid series number in setVisibility: " + num
);
3122 * How large of an area will the dygraph render itself in?
3123 * This is used for testing.
3124 * @return A {width: w, height: h} object.
3127 Dygraph
.prototype.size
= function() {
3128 return { width
: this.width_
, height
: this.height_
};
3132 * Update the list of annotations and redraw the chart.
3133 * See dygraphs.com/annotations.html for more info on how to use annotations.
3134 * @param ann {Array} An array of annotation objects.
3135 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3137 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3138 // Only add the annotation CSS rule once we know it will be used.
3139 Dygraph
.addAnnotationRule();
3140 this.annotations_
= ann
;
3141 this.layout_
.setAnnotations(this.annotations_
);
3142 if (!suppressDraw
) {
3148 * Return the list of annotations.
3150 Dygraph
.prototype.annotations
= function() {
3151 return this.annotations_
;
3155 * Get the index of a series (column) given its name. The first column is the
3156 * x-axis, so the data series start with index 1.
3158 Dygraph
.prototype.indexFromSetName
= function(name
) {
3159 var labels
= this.attr_("labels");
3160 for (var i
= 0; i
< labels
.length
; i
++) {
3161 if (labels
[i
] == name
) return i
;
3168 * Adds a default style for the annotation CSS classes to the document. This is
3169 * only executed when annotations are actually used. It is designed to only be
3170 * called once -- all calls after the first will return immediately.
3172 Dygraph
.addAnnotationRule
= function() {
3173 if (Dygraph
.addedAnnotationCSS
) return;
3175 var rule
= "border: 1px solid black; " +
3176 "background-color: white; " +
3177 "text-align: center;";
3179 var styleSheetElement
= document
.createElement("style");
3180 styleSheetElement
.type
= "text/css";
3181 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3183 // Find the first style sheet that we can access.
3184 // We may not add a rule to a style sheet from another domain for security
3185 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3186 // adds its own style sheets from google.com.
3187 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3188 if (document
.styleSheets
[i
].disabled
) continue;
3189 var mysheet
= document
.styleSheets
[i
];
3191 if (mysheet
.insertRule
) { // Firefox
3192 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3193 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3194 } else if (mysheet
.addRule
) { // IE
3195 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3197 Dygraph
.addedAnnotationCSS
= true;
3200 // Was likely a security exception.
3204 this.warn("Unable to add default annotation CSS rule; display may be off.");
3207 // Older pages may still use this name.
3208 var DateGraph
= Dygraph
;