1 // Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
2 // All Rights Reserved.
5 * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
6 * string. Dygraph can handle multiple series with or without error bars. The
7 * date/value ranges will be automatically set. Dygraph uses the
8 * <canvas> tag, so it only works in FF1.5+.
9 * @author danvdk@gmail.com (Dan Vanderkam)
12 <div id="graphdiv" style="width:800px; height:500px;"></div>
13 <script type="text/javascript">
14 new Dygraph(document.getElementById("graphdiv"),
15 "datafile.csv", // CSV file with headers
19 The CSV file is of the form
21 Date,SeriesA,SeriesB,SeriesC
25 If the 'errorBars' option is set in the constructor, the input should be of
27 Date,SeriesA,SeriesB,...
28 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
29 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
31 If the 'fractions' option is set, the input should be of the form:
33 Date,SeriesA,SeriesB,...
34 YYYYMMDD,A1/B1,A2/B2,...
35 YYYYMMDD,A1/B1,A2/B2,...
37 And error bars will be calculated automatically using a binomial distribution.
39 For further documentation and examples, see http://dygraphs.com/
44 * An interactive, zoomable graph
45 * @param {String | Function} file A file containing CSV data or a function that
46 * returns this data. The expected format for each line is
47 * YYYYMMDD,val1,val2,... or, if attrs.errorBars is set,
48 * YYYYMMDD,val1,stddev1,val2,stddev2,...
49 * @param {Object} attrs Various other attributes, e.g. errorBars determines
50 * whether the input data contains error ranges.
52 Dygraph
= function(div
, data
, opts
) {
53 if (arguments
.length
> 0) {
54 if (arguments
.length
== 4) {
55 // Old versions of dygraphs took in the series labels as a constructor
56 // parameter. This doesn't make sense anymore, but it's easy to continue
57 // to support this usage.
58 this.warn("Using deprecated four-argument dygraph constructor");
59 this.__old_init__(div
, data
, arguments
[2], arguments
[3]);
61 this.__init__(div
, data
, opts
);
66 Dygraph
.NAME
= "Dygraph";
67 Dygraph
.VERSION
= "1.2";
68 Dygraph
.__repr__
= function() {
69 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
71 Dygraph
.toString
= function() {
72 return this.__repr__();
76 * Formatting to use for an integer number.
78 * @param {Number} x The number to format
79 * @param {Number} unused_precision The precision to use, ignored.
80 * @return {String} A string formatted like %g in printf. The max generated
81 * string length should be precision + 6 (e.g 1.123e+300).
83 Dygraph
.intFormat
= function(x
, unused_precision
) {
88 * Number formatting function which mimicks the behavior of %g in printf, i.e.
89 * either exponential or fixed format (without trailing 0s) is used depending on
90 * the length of the generated string. The advantage of this format is that
91 * there is a predictable upper bound on the resulting string length,
92 * significant figures are not dropped, and normal numbers are not displayed in
93 * exponential notation.
95 * NOTE: JavaScript's native toPrecision() is NOT a drop-in replacement for %g.
96 * It creates strings which are too long for absolute values between 10^-4 and
97 * 10^-6. See tests/number-format.html for output examples.
99 * @param {Number} x The number to format
100 * @param {Number} opt_precision The precision to use, default 2.
101 * @return {String} A string formatted like %g in printf. The max generated
102 * string length should be precision + 6 (e.g 1.123e+300).
104 Dygraph
.floatFormat
= function(x
, opt_precision
) {
105 // Avoid invalid precision values; [1, 21] is the valid range.
106 var p
= Math
.min(Math
.max(1, opt_precision
|| 2), 21);
108 // This is deceptively simple. The actual algorithm comes from:
110 // Max allowed length = p + 4
111 // where 4 comes from 'e+n' and '.'.
113 // Length of fixed format = 2 + y + p
114 // where 2 comes from '0.' and y = # of leading zeroes.
116 // Equating the two and solving for y yields y = 2, or 0.00xxxx which is
119 // Since the behavior of toPrecision() is identical for larger numbers, we
120 // don't have to worry about the other bound.
122 // Finally, the argument for toExponential() is the number of trailing digits,
123 // so we take off 1 for the value before the '.'.
124 return (Math
.abs(x
) < 1.0e-3 && x
!= 0.0) ?
125 x
.toExponential(p
- 1) : x
.toPrecision(p
);
128 // Various default values
129 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
130 Dygraph
.DEFAULT_WIDTH
= 480;
131 Dygraph
.DEFAULT_HEIGHT
= 320;
132 Dygraph
.AXIS_LINE_WIDTH
= 0.3;
134 Dygraph
.LOG_SCALE
= 10;
135 Dygraph
.LN_TEN
= Math
.log(Dygraph
.LOG_SCALE
);
136 Dygraph
.log10
= function(x
) {
137 return Math
.log(x
) / Dygraph
.LN_TEN
;
140 // Default attribute values.
141 Dygraph
.DEFAULT_ATTRS
= {
142 highlightCircleSize
: 3,
148 // TODO(danvk): move defaults from createStatusMessage_ here.
150 labelsSeparateLines
: false,
151 labelsShowZeroValues
: true,
154 showLabelsOnHighlight
: true,
156 yValueFormatter
: function(x
, opt_precision
) {
157 var s
= Dygraph
.floatFormat(x
, opt_precision
);
158 var s2
= Dygraph
.intFormat(x
);
159 return s
.length
< s2
.length
? s
: s2
;
165 axisLabelFontSize
: 14,
168 xAxisLabelFormatter
: Dygraph
.dateAxisFormatter
,
172 xValueFormatter
: Dygraph
.dateString_
,
173 xValueParser
: Dygraph
.dateParser
,
174 xTicker
: Dygraph
.dateTicker
,
181 wilsonInterval
: true, // only relevant if fractions is true
185 connectSeparatedPoints
: false,
188 hideOverlayOnMouseOut
: true,
193 interactionModel
: null // will be set to Dygraph.defaultInteractionModel.
196 // Various logging levels.
202 // Directions for panning and zooming. Use bit operations when combined
203 // values are possible.
204 Dygraph
.HORIZONTAL
= 1;
205 Dygraph
.VERTICAL
= 2;
207 // Used for initializing annotation CSS rules only once.
208 Dygraph
.addedAnnotationCSS
= false;
210 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
211 // Labels is no longer a constructor parameter, since it's typically set
212 // directly from the data source. It also conains a name for the x-axis,
213 // which the previous constructor form did not.
214 if (labels
!= null) {
215 var new_labels
= ["Date"];
216 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
217 Dygraph
.update(attrs
, { 'labels': new_labels
});
219 this.__init__(div
, file
, attrs
);
223 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
224 * and context <canvas> inside of it. See the constructor for details.
226 * @param {Element} div the Element to render the graph into.
227 * @param {String | Function} file Source data
228 * @param {Object} attrs Miscellaneous other options
231 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
232 // Hack for IE: if we're using excanvas and the document hasn't finished
233 // loading yet (and hence may not have initialized whatever it needs to
234 // initialize), then keep calling this routine periodically until it has.
235 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
236 typeof(G_vmlCanvasManager
) != 'undefined' &&
237 document
.readyState
!= 'complete') {
239 setTimeout(function() { self
.__init__(div
, file
, attrs
) }, 100);
242 // Support two-argument constructor
243 if (attrs
== null) { attrs
= {}; }
245 // Copy the important bits into the object
246 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
249 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
250 this.previousVerticalX_
= -1;
251 this.fractions_
= attrs
.fractions
|| false;
252 this.dateWindow_
= attrs
.dateWindow
|| null;
254 this.wilsonInterval_
= attrs
.wilsonInterval
|| true;
255 this.is_initial_draw_
= true;
256 this.annotations_
= [];
258 // Number of digits to use when labeling the x (if numeric) and y axis
260 this.numXDigits_
= 2;
261 this.numYDigits_
= 2;
263 // When labeling x (if numeric) or y values in the legend, there are
264 // numDigits + numExtraDigits of precision used. For axes labels with N
265 // digits of precision, the data should be displayed with at least N+1 digits
266 // of precision. The reason for this is to divide each interval between
267 // successive ticks into tenths (for 1) or hundredths (for 2), etc. For
268 // example, if the labels are [0, 1, 2], we want data to be displayed as
270 this.numExtraDigits_
= 1;
272 // Clear the div. This ensure that, if multiple dygraphs are passed the same
273 // div, then only one will be drawn.
276 // If the div isn't already sized then inherit from our attrs or
277 // give it a default size.
278 if (div
.style
.width
== '') {
279 div
.style
.width
= (attrs
.width
|| Dygraph
.DEFAULT_WIDTH
) + "px";
281 if (div
.style
.height
== '') {
282 div
.style
.height
= (attrs
.height
|| Dygraph
.DEFAULT_HEIGHT
) + "px";
284 this.width_
= parseInt(div
.style
.width
, 10);
285 this.height_
= parseInt(div
.style
.height
, 10);
286 // The div might have been specified as percent of the current window size,
287 // convert that to an appropriate number of pixels.
288 if (div
.style
.width
.indexOf("%") == div
.style
.width
.length
- 1) {
289 this.width_
= div
.offsetWidth
;
291 if (div
.style
.height
.indexOf("%") == div
.style
.height
.length
- 1) {
292 this.height_
= div
.offsetHeight
;
295 if (this.width_
== 0) {
296 this.error("dygraph has zero width. Please specify a width in pixels.");
298 if (this.height_
== 0) {
299 this.error("dygraph has zero height. Please specify a height in pixels.");
302 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
303 if (attrs
['stackedGraph']) {
304 attrs
['fillGraph'] = true;
305 // TODO(nikhilk): Add any other stackedGraph checks here.
308 // Dygraphs has many options, some of which interact with one another.
309 // To keep track of everything, we maintain two sets of options:
311 // this.user_attrs_ only options explicitly set by the user.
312 // this.attrs_ defaults, options derived from user_attrs_, data.
314 // Options are then accessed this.attr_('attr'), which first looks at
315 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
316 // defaults without overriding behavior that the user specifically asks for.
317 this.user_attrs_
= {};
318 Dygraph
.update(this.user_attrs_
, attrs
);
321 Dygraph
.update(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
323 this.boundaryIds_
= [];
325 // Make a note of whether labels will be pulled from the CSV file.
326 this.labelsFromCSV_
= (this.attr_("labels") == null);
328 // Create the containing DIV and other interactive elements
329 this.createInterface_();
334 Dygraph
.prototype.toString
= function() {
335 var maindiv
= this.maindiv_
;
336 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
337 return "[Dygraph " + id
+ "]";
340 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
342 typeof(this.user_attrs_
[seriesName
]) != 'undefined' &&
343 this.user_attrs_
[seriesName
] != null &&
344 typeof(this.user_attrs_
[seriesName
][name
]) != 'undefined') {
345 return this.user_attrs_
[seriesName
][name
];
346 } else if (typeof(this.user_attrs_
[name
]) != 'undefined') {
347 return this.user_attrs_
[name
];
348 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
349 return this.attrs_
[name
];
355 // TODO(danvk): any way I can get the line numbers to be this.warn call?
356 Dygraph
.prototype.log
= function(severity
, message
) {
357 if (typeof(console
) != 'undefined') {
360 console
.debug('dygraphs: ' + message
);
363 console
.info('dygraphs: ' + message
);
365 case Dygraph
.WARNING
:
366 console
.warn('dygraphs: ' + message
);
369 console
.error('dygraphs: ' + message
);
374 Dygraph
.prototype.info
= function(message
) {
375 this.log(Dygraph
.INFO
, message
);
377 Dygraph
.prototype.warn
= function(message
) {
378 this.log(Dygraph
.WARNING
, message
);
380 Dygraph
.prototype.error
= function(message
) {
381 this.log(Dygraph
.ERROR
, message
);
385 * Returns the current rolling period, as set by the user or an option.
386 * @return {Number} The number of points in the rolling window
388 Dygraph
.prototype.rollPeriod
= function() {
389 return this.rollPeriod_
;
393 * Returns the currently-visible x-range. This can be affected by zooming,
394 * panning or a call to updateOptions.
395 * Returns a two-element array: [left, right].
396 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
398 Dygraph
.prototype.xAxisRange
= function() {
399 if (this.dateWindow_
) return this.dateWindow_
;
401 // The entire chart is visible.
402 var left
= this.rawData_
[0][0];
403 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
404 return [left
, right
];
408 * Returns the currently-visible y-range for an axis. This can be affected by
409 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
410 * called with no arguments, returns the range of the first axis.
411 * Returns a two-element array: [bottom, top].
413 Dygraph
.prototype.yAxisRange
= function(idx
) {
414 if (typeof(idx
) == "undefined") idx
= 0;
415 if (idx
< 0 || idx
>= this.axes_
.length
) return null;
416 return [ this.axes_
[idx
].computedValueRange
[0],
417 this.axes_
[idx
].computedValueRange
[1] ];
421 * Returns the currently-visible y-ranges for each axis. This can be affected by
422 * zooming, panning, calls to updateOptions, etc.
423 * Returns an array of [bottom, top] pairs, one for each y-axis.
425 Dygraph
.prototype.yAxisRanges
= function() {
427 for (var i
= 0; i
< this.axes_
.length
; i
++) {
428 ret
.push(this.yAxisRange(i
));
433 // TODO(danvk): use these functions throughout dygraphs.
435 * Convert from data coordinates to canvas/div X/Y coordinates.
436 * If specified, do this conversion for the coordinate system of a particular
437 * axis. Uses the first axis by default.
438 * Returns a two-element array: [X, Y]
440 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
441 * instead of toDomCoords(null, y, axis).
443 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
444 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
448 * Convert from data x coordinates to canvas/div X coordinate.
449 * If specified, do this conversion for the coordinate system of a particular
451 * Returns a single value or null if x is null.
453 Dygraph
.prototype.toDomXCoord
= function(x
) {
458 var area
= this.plotter_
.area
;
459 var xRange
= this.xAxisRange();
460 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
464 * Convert from data x coordinates to canvas/div Y coordinate and optional
465 * axis. Uses the first axis by default.
467 * returns a single value or null if y is null.
469 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
470 var pct
= this.toPercentYCoord(y
, axis
);
475 var area
= this.plotter_
.area
;
476 return area
.y
+ pct
* area
.h
;
480 * Convert from canvas/div coords to data coordinates.
481 * If specified, do this conversion for the coordinate system of a particular
482 * axis. Uses the first axis by default.
483 * Returns a two-element array: [X, Y].
485 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
486 * instead of toDataCoords(null, y, axis).
488 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
489 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
493 * Convert from canvas/div x coordinate to data coordinate.
495 * If x is null, this returns null.
497 Dygraph
.prototype.toDataXCoord
= function(x
) {
502 var area
= this.plotter_
.area
;
503 var xRange
= this.xAxisRange();
504 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
508 * Convert from canvas/div y coord to value.
510 * If y is null, this returns null.
511 * if axis is null, this uses the first axis.
513 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
518 var area
= this.plotter_
.area
;
519 var yRange
= this.yAxisRange(axis
);
521 if (typeof(axis
) == "undefined") axis
= 0;
522 if (!this.axes_
[axis
].logscale
) {
523 return yRange
[0] + (area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
525 // Computing the inverse of toDomCoord.
526 var pct
= (y
- area
.y
) / area
.h
528 // Computing the inverse of toPercentYCoord. The function was arrived at with
529 // the following steps:
531 // Original calcuation:
532 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
534 // Move denominator to both sides:
535 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
537 // subtract logr1, and take the negative value.
538 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
540 // Swap both sides of the equation, and we can compute the log of the
541 // return value. Which means we just need to use that as the exponent in
543 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
545 var logr1
= Dygraph
.log10(yRange
[1]);
546 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
547 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
553 * Converts a y for an axis to a percentage from the top to the
556 * If the coordinate represents a value visible on the canvas, then
557 * the value will be between 0 and 1, where 0 is the top of the canvas.
558 * However, this method will return values outside the range, as
559 * values can fall outside the canvas.
561 * If y is null, this returns null.
562 * if axis is null, this uses the first axis.
564 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
568 if (typeof(axis
) == "undefined") axis
= 0;
570 var area
= this.plotter_
.area
;
571 var yRange
= this.yAxisRange(axis
);
574 if (!this.axes_
[axis
].logscale
) {
575 // yrange[1] - y is unit distance from the bottom.
576 // yrange[1] - yrange[0] is the scale of the range.
577 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
578 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
580 var logr1
= Dygraph
.log10(yRange
[1]);
581 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
587 * Returns the number of columns (including the independent variable).
589 Dygraph
.prototype.numColumns
= function() {
590 return this.rawData_
[0].length
;
594 * Returns the number of rows (excluding any header/label row).
596 Dygraph
.prototype.numRows
= function() {
597 return this.rawData_
.length
;
601 * Returns the value in the given row and column. If the row and column exceed
602 * the bounds on the data, returns null. Also returns null if the value is
605 Dygraph
.prototype.getValue
= function(row
, col
) {
606 if (row
< 0 || row
> this.rawData_
.length
) return null;
607 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
609 return this.rawData_
[row
][col
];
612 Dygraph
.addEvent
= function(el
, evt
, fn
) {
613 var normed_fn
= function(e
) {
614 if (!e
) var e
= window
.event
;
617 if (window
.addEventListener
) { // Mozilla, Netscape, Firefox
618 el
.addEventListener(evt
, normed_fn
, false);
620 el
.attachEvent('on' + evt
, normed_fn
);
625 // Based on the article at
626 // http://www.switchonthecode.com/tutorials
/javascript
-tutorial
-the
-scroll
-wheel
627 Dygraph
.cancelEvent
= function(e
) {
628 e
= e
? e
: window
.event
;
629 if (e
.stopPropagation
) {
632 if (e
.preventDefault
) {
635 e
.cancelBubble
= true;
637 e
.returnValue
= false;
643 * Generates interface elements for the Dygraph: a containing div, a div to
644 * display the current point, and a textbox to adjust the rolling average
645 * period. Also creates the Renderer/Layout elements.
648 Dygraph
.prototype.createInterface_
= function() {
649 // Create the all-enclosing graph div
650 var enclosing
= this.maindiv_
;
652 this.graphDiv
= document
.createElement("div");
653 this.graphDiv
.style
.width
= this.width_
+ "px";
654 this.graphDiv
.style
.height
= this.height_
+ "px";
655 enclosing
.appendChild(this.graphDiv
);
657 // Create the canvas for interactive parts of the chart.
658 this.canvas_
= Dygraph
.createCanvas();
659 this.canvas_
.style
.position
= "absolute";
660 this.canvas_
.width
= this.width_
;
661 this.canvas_
.height
= this.height_
;
662 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
663 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
665 // ... and for static parts of the chart.
666 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
668 // The interactive parts of the graph are drawn on top of the chart.
669 this.graphDiv
.appendChild(this.hidden_
);
670 this.graphDiv
.appendChild(this.canvas_
);
671 this.mouseEventElement_
= this.canvas_
;
674 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(e
) {
675 dygraph
.mouseMove_(e
);
677 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(e
) {
678 dygraph
.mouseOut_(e
);
681 // Create the grapher
682 // TODO(danvk): why does the Layout need its own set of options?
683 this.layoutOptions_
= { 'xOriginIsZero': false };
684 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
685 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
686 Dygraph
.update(this.layoutOptions_
, {
687 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) });
689 this.layout_
= new DygraphLayout(this, this.layoutOptions_
);
691 // TODO(danvk): why does the Renderer need its own set of options?
692 this.renderOptions_
= { colorScheme
: this.colors_
,
694 axisLineWidth
: Dygraph
.AXIS_LINE_WIDTH
};
695 Dygraph
.update(this.renderOptions_
, this.attrs_
);
696 Dygraph
.update(this.renderOptions_
, this.user_attrs_
);
698 this.createStatusMessage_();
699 this.createDragInterface_();
703 * Detach DOM elements in the dygraph and null out all data references.
704 * Calling this when you're done with a dygraph can dramatically reduce memory
705 * usage. See, e.g., the tests/perf.html example.
707 Dygraph
.prototype.destroy
= function() {
708 var removeRecursive
= function(node
) {
709 while (node
.hasChildNodes()) {
710 removeRecursive(node
.firstChild
);
711 node
.removeChild(node
.firstChild
);
714 removeRecursive(this.maindiv_
);
716 var nullOut
= function(obj
) {
718 if (typeof(obj
[n
]) === 'object') {
724 // These may not all be necessary, but it can't hurt...
725 nullOut(this.layout_
);
726 nullOut(this.plotter_
);
731 * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on
732 * this particular canvas. All Dygraph work is done on this.canvas_.
733 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
734 * @return {Object} The newly-created canvas
737 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
738 var h
= Dygraph
.createCanvas();
739 h
.style
.position
= "absolute";
740 // TODO(danvk): h should be offset from canvas. canvas needs to include
741 // some extra area to make it easier to zoom in on the far left and far
742 // right. h needs to be precisely the plot area, so that clipping occurs.
743 h
.style
.top
= canvas
.style
.top
;
744 h
.style
.left
= canvas
.style
.left
;
745 h
.width
= this.width_
;
746 h
.height
= this.height_
;
747 h
.style
.width
= this.width_
+ "px"; // for IE
748 h
.style
.height
= this.height_
+ "px"; // for IE
752 // Taken from MochiKit.Color
753 Dygraph
.hsvToRGB
= function (hue
, saturation
, value
) {
757 if (saturation
=== 0) {
762 var i
= Math
.floor(hue
* 6);
763 var f
= (hue
* 6) - i
;
764 var p
= value
* (1 - saturation
);
765 var q
= value
* (1 - (saturation
* f
));
766 var t
= value
* (1 - (saturation
* (1 - f
)));
768 case 1: red
= q
; green
= value
; blue
= p
; break;
769 case 2: red
= p
; green
= value
; blue
= t
; break;
770 case 3: red
= p
; green
= q
; blue
= value
; break;
771 case 4: red
= t
; green
= p
; blue
= value
; break;
772 case 5: red
= value
; green
= p
; blue
= q
; break;
773 case 6: // fall through
774 case 0: red
= value
; green
= t
; blue
= p
; break;
777 red
= Math
.floor(255 * red
+ 0.5);
778 green
= Math
.floor(255 * green
+ 0.5);
779 blue
= Math
.floor(255 * blue
+ 0.5);
780 return 'rgb(' + red
+ ',' + green
+ ',' + blue
+ ')';
785 * Generate a set of distinct colors for the data series. This is done with a
786 * color wheel. Saturation/Value are customizable, and the hue is
787 * equally-spaced around the color wheel. If a custom set of colors is
788 * specified, that is used instead.
791 Dygraph
.prototype.setColors_
= function() {
792 // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do
793 // away with this.renderOptions_.
794 var num
= this.attr_("labels").length
- 1;
796 var colors
= this.attr_('colors');
798 var sat
= this.attr_('colorSaturation') || 1.0;
799 var val
= this.attr_('colorValue') || 0.5;
800 var half
= Math
.ceil(num
/ 2);
801 for (var i
= 1; i
<= num
; i
++) {
802 if (!this.visibility()[i
-1]) continue;
803 // alternate colors for high contrast.
804 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
805 var hue
= (1.0 * idx
/ (1 + num
));
806 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
809 for (var i
= 0; i
< num
; i
++) {
810 if (!this.visibility()[i
]) continue;
811 var colorStr
= colors
[i
% colors
.length
];
812 this.colors_
.push(colorStr
);
816 // TODO(danvk): update this w/r
/t/ the
new options system
.
817 this.renderOptions_
.colorScheme
= this.colors_
;
818 Dygraph
.update(this.plotter_
.options
, this.renderOptions_
);
819 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
820 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
824 * Return the list of colors. This is either the list of colors passed in the
825 * attributes, or the autogenerated list of rgb(r,g,b) strings.
826 * @return {Array<string>} The list of colors.
828 Dygraph
.prototype.getColors
= function() {
832 // The following functions are from quirksmode.org with a modification for Safari from
833 // http://blog.firetree.net/2005/07/04/javascript-find-position/
834 // http://www.quirksmode.org/js
/findpos
.html
835 Dygraph
.findPosX
= function(obj
) {
840 curleft
+= obj
.offsetLeft
;
841 if(!obj
.offsetParent
)
843 obj
= obj
.offsetParent
;
850 Dygraph
.findPosY
= function(obj
) {
855 curtop
+= obj
.offsetTop
;
856 if(!obj
.offsetParent
)
858 obj
= obj
.offsetParent
;
868 * Create the div that contains information on the selected point(s)
869 * This goes in the top right of the canvas, unless an external div has already
873 Dygraph
.prototype.createStatusMessage_
= function() {
874 var userLabelsDiv
= this.user_attrs_
["labelsDiv"];
875 if (userLabelsDiv
&& null != userLabelsDiv
876 && (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
877 this.user_attrs_
["labelsDiv"] = document
.getElementById(userLabelsDiv
);
879 if (!this.attr_("labelsDiv")) {
880 var divWidth
= this.attr_('labelsDivWidth');
882 "position": "absolute",
885 "width": divWidth
+ "px",
887 "left": (this.width_
- divWidth
- 2) + "px",
888 "background": "white",
890 "overflow": "hidden"};
891 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
892 var div
= document
.createElement("div");
893 for (var name
in messagestyle
) {
894 if (messagestyle
.hasOwnProperty(name
)) {
895 div
.style
[name
] = messagestyle
[name
];
898 this.graphDiv
.appendChild(div
);
899 this.attrs_
.labelsDiv
= div
;
904 * Position the labels div so that its right edge is flush with the right edge
905 * of the charting area.
907 Dygraph
.prototype.positionLabelsDiv_
= function() {
908 // Don't touch a user-specified labelsDiv.
909 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
911 var area
= this.plotter_
.area
;
912 var div
= this.attr_("labelsDiv");
913 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
917 * Create the text box to adjust the averaging period
920 Dygraph
.prototype.createRollInterface_
= function() {
921 // Create a roller if one doesn't exist already.
923 this.roller_
= document
.createElement("input");
924 this.roller_
.type
= "text";
925 this.roller_
.style
.display
= "none";
926 this.graphDiv
.appendChild(this.roller_
);
929 var display
= this.attr_('showRoller') ? 'block' : 'none';
931 var textAttr
= { "position": "absolute",
933 "top": (this.plotter_
.area
.h
- 25) + "px",
934 "left": (this.plotter_
.area
.x
+ 1) + "px",
937 this.roller_
.size
= "2";
938 this.roller_
.value
= this.rollPeriod_
;
939 for (var name
in textAttr
) {
940 if (textAttr
.hasOwnProperty(name
)) {
941 this.roller_
.style
[name
] = textAttr
[name
];
946 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
949 // These functions are taken from MochiKit.Signal
950 Dygraph
.pageX
= function(e
) {
952 return (!e
.pageX
|| e
.pageX
< 0) ? 0 : e
.pageX
;
955 var b
= document
.body
;
957 (de
.scrollLeft
|| b
.scrollLeft
) -
958 (de
.clientLeft
|| 0);
962 Dygraph
.pageY
= function(e
) {
964 return (!e
.pageY
|| e
.pageY
< 0) ? 0 : e
.pageY
;
967 var b
= document
.body
;
969 (de
.scrollTop
|| b
.scrollTop
) -
974 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
975 return Dygraph
.pageX(e
) - context
.px
978 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
979 return Dygraph
.pageY(e
) - context
.py
982 // Called in response to an interaction model operation that
983 // should start the default panning behavior.
985 // It's used in the default callback for "mousedown" operations.
986 // Custom interaction model builders can use it to provide the default
989 Dygraph
.startPan
= function(event
, g
, context
) {
990 context
.isPanning
= true;
991 var xRange
= g
.xAxisRange();
992 context
.dateRange
= xRange
[1] - xRange
[0];
993 context
.initialLeftmostDate
= xRange
[0];
994 context
.xUnitsPerPixel
= context
.dateRange
/ (g
.plotter_
.area
.w
- 1);
996 // Record the range of each y-axis at the start of the drag.
997 // If any axis has a valueRange or valueWindow, then we want a 2D pan.
998 context
.is2DPan
= false;
999 for (var i
= 0; i
< g
.axes_
.length
; i
++) {
1000 var axis
= g
.axes_
[i
];
1001 var yRange
= g
.yAxisRange(i
);
1002 // TODO(konigsberg): These values should be in |context|.
1003 // In log scale, initialTopValue, dragValueRange and unitsPerPixel are log scale.
1004 if (axis
.logscale
) {
1005 axis
.initialTopValue
= Dygraph
.log10(yRange
[1]);
1006 axis
.dragValueRange
= Dygraph
.log10(yRange
[1]) - Dygraph
.log10(yRange
[0]);
1008 axis
.initialTopValue
= yRange
[1];
1009 axis
.dragValueRange
= yRange
[1] - yRange
[0];
1011 axis
.unitsPerPixel
= axis
.dragValueRange
/ (g
.plotter_
.area
.h
- 1);
1013 // While calculating axes, set 2dpan.
1014 if (axis
.valueWindow
|| axis
.valueRange
) context
.is2DPan
= true;
1018 // Called in response to an interaction model operation that
1019 // responds to an event that pans the view.
1021 // It's used in the default callback for "mousemove" operations.
1022 // Custom interaction model builders can use it to provide the default
1023 // panning behavior.
1025 Dygraph
.movePan
= function(event
, g
, context
) {
1026 context
.dragEndX
= g
.dragGetX_(event
, context
);
1027 context
.dragEndY
= g
.dragGetY_(event
, context
);
1029 var minDate
= context
.initialLeftmostDate
-
1030 (context
.dragEndX
- context
.dragStartX
) * context
.xUnitsPerPixel
;
1031 var maxDate
= minDate
+ context
.dateRange
;
1032 g
.dateWindow_
= [minDate
, maxDate
];
1034 // y-axis scaling is automatic unless this is a full 2D pan.
1035 if (context
.is2DPan
) {
1036 // Adjust each axis appropriately.
1037 for (var i
= 0; i
< g
.axes_
.length
; i
++) {
1038 var axis
= g
.axes_
[i
];
1040 var pixelsDragged
= context
.dragEndY
- context
.dragStartY
;
1041 var unitsDragged
= pixelsDragged
* axis
.unitsPerPixel
;
1043 // In log scale, maxValue and minValue are the logs of those values.
1044 var maxValue
= axis
.initialTopValue
+ unitsDragged
;
1045 var minValue
= maxValue
- axis
.dragValueRange
;
1046 if (axis
.logscale
) {
1047 axis
.valueWindow
= [ Math
.pow(Dygraph
.LOG_SCALE
, minValue
),
1048 Math
.pow(Dygraph
.LOG_SCALE
, maxValue
) ];
1050 axis
.valueWindow
= [ minValue
, maxValue
];
1058 // Called in response to an interaction model operation that
1059 // responds to an event that ends panning.
1061 // It's used in the default callback for "mouseup" operations.
1062 // Custom interaction model builders can use it to provide the default
1063 // panning behavior.
1065 Dygraph
.endPan
= function(event
, g
, context
) {
1066 // TODO(konigsberg): Clear the context data from the axis.
1067 // TODO(konigsberg): mouseup should just delete the
1068 // context object, and mousedown should create a new one.
1069 context
.isPanning
= false;
1070 context
.is2DPan
= false;
1071 context
.initialLeftmostDate
= null;
1072 context
.dateRange
= null;
1073 context
.valueRange
= null;
1076 // Called in response to an interaction model operation that
1077 // responds to an event that starts zooming.
1079 // It's used in the default callback for "mousedown" operations.
1080 // Custom interaction model builders can use it to provide the default
1081 // zooming behavior.
1083 Dygraph
.startZoom
= function(event
, g
, context
) {
1084 context
.isZooming
= true;
1087 // Called in response to an interaction model operation that
1088 // responds to an event that defines zoom boundaries.
1090 // It's used in the default callback for "mousemove" operations.
1091 // Custom interaction model builders can use it to provide the default
1092 // zooming behavior.
1094 Dygraph
.moveZoom
= function(event
, g
, context
) {
1095 context
.dragEndX
= g
.dragGetX_(event
, context
);
1096 context
.dragEndY
= g
.dragGetY_(event
, context
);
1098 var xDelta
= Math
.abs(context
.dragStartX
- context
.dragEndX
);
1099 var yDelta
= Math
.abs(context
.dragStartY
- context
.dragEndY
);
1101 // drag direction threshold for y axis is twice as large as x axis
1102 context
.dragDirection
= (xDelta
< yDelta
/ 2) ? Dygraph
.VERTICAL
: Dygraph
.HORIZONTAL
;
1105 context
.dragDirection
,
1110 context
.prevDragDirection
,
1114 context
.prevEndX
= context
.dragEndX
;
1115 context
.prevEndY
= context
.dragEndY
;
1116 context
.prevDragDirection
= context
.dragDirection
;
1119 // Called in response to an interaction model operation that
1120 // responds to an event that performs a zoom based on previously defined
1123 // It's used in the default callback for "mouseup" operations.
1124 // Custom interaction model builders can use it to provide the default
1125 // zooming behavior.
1127 Dygraph
.endZoom
= function(event
, g
, context
) {
1128 context
.isZooming
= false;
1129 context
.dragEndX
= g
.dragGetX_(event
, context
);
1130 context
.dragEndY
= g
.dragGetY_(event
, context
);
1131 var regionWidth
= Math
.abs(context
.dragEndX
- context
.dragStartX
);
1132 var regionHeight
= Math
.abs(context
.dragEndY
- context
.dragStartY
);
1134 if (regionWidth
< 2 && regionHeight
< 2 &&
1135 g
.lastx_
!= undefined
&& g
.lastx_
!= -1) {
1136 // TODO(danvk): pass along more info about the points, e.g. 'x'
1137 if (g
.attr_('clickCallback') != null) {
1138 g
.attr_('clickCallback')(event
, g
.lastx_
, g
.selPoints_
);
1140 if (g
.attr_('pointClickCallback')) {
1141 // check if the click was on a particular point.
1142 var closestIdx
= -1;
1143 var closestDistance
= 0;
1144 for (var i
= 0; i
< g
.selPoints_
.length
; i
++) {
1145 var p
= g
.selPoints_
[i
];
1146 var distance
= Math
.pow(p
.canvasx
- context
.dragEndX
, 2) +
1147 Math
.pow(p
.canvasy
- context
.dragEndY
, 2);
1148 if (closestIdx
== -1 || distance
< closestDistance
) {
1149 closestDistance
= distance
;
1154 // Allow any click within two pixels of the dot.
1155 var radius
= g
.attr_('highlightCircleSize') + 2;
1156 if (closestDistance
<= 5 * 5) {
1157 g
.attr_('pointClickCallback')(event
, g
.selPoints_
[closestIdx
]);
1162 if (regionWidth
>= 10 && context
.dragDirection
== Dygraph
.HORIZONTAL
) {
1163 g
.doZoomX_(Math
.min(context
.dragStartX
, context
.dragEndX
),
1164 Math
.max(context
.dragStartX
, context
.dragEndX
));
1165 } else if (regionHeight
>= 10 && context
.dragDirection
== Dygraph
.VERTICAL
) {
1166 g
.doZoomY_(Math
.min(context
.dragStartY
, context
.dragEndY
),
1167 Math
.max(context
.dragStartY
, context
.dragEndY
));
1169 g
.canvas_
.getContext("2d").clearRect(0, 0,
1173 context
.dragStartX
= null;
1174 context
.dragStartY
= null;
1177 Dygraph
.defaultInteractionModel
= {
1178 // Track the beginning of drag events
1179 mousedown
: function(event
, g
, context
) {
1180 context
.initializeMouseDown(event
, g
, context
);
1182 if (event
.altKey
|| event
.shiftKey
) {
1183 Dygraph
.startPan(event
, g
, context
);
1185 Dygraph
.startZoom(event
, g
, context
);
1189 // Draw zoom rectangles when the mouse is down and the user moves around
1190 mousemove
: function(event
, g
, context
) {
1191 if (context
.isZooming
) {
1192 Dygraph
.moveZoom(event
, g
, context
);
1193 } else if (context
.isPanning
) {
1194 Dygraph
.movePan(event
, g
, context
);
1198 mouseup
: function(event
, g
, context
) {
1199 if (context
.isZooming
) {
1200 Dygraph
.endZoom(event
, g
, context
);
1201 } else if (context
.isPanning
) {
1202 Dygraph
.endPan(event
, g
, context
);
1206 // Temporarily cancel the dragging event when the mouse leaves the graph
1207 mouseout
: function(event
, g
, context
) {
1208 if (context
.isZooming
) {
1209 context
.dragEndX
= null;
1210 context
.dragEndY
= null;
1214 // Disable zooming out if panning.
1215 dblclick
: function(event
, g
, context
) {
1216 if (event
.altKey
|| event
.shiftKey
) {
1219 // TODO(konigsberg): replace g.doUnzoom()_ with something that is
1220 // friendlier to public use.
1225 Dygraph
.DEFAULT_ATTRS
.interactionModel
= Dygraph
.defaultInteractionModel
;
1228 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1232 Dygraph
.prototype.createDragInterface_
= function() {
1234 // Tracks whether the mouse is down right now
1236 isPanning
: false, // is this drag part of a pan?
1237 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1242 dragDirection
: null,
1245 prevDragDirection
: null,
1247 // The value on the left side of the graph when a pan operation starts.
1248 initialLeftmostDate
: null,
1250 // The number of units each pixel spans. (This won't be valid for log
1252 xUnitsPerPixel
: null,
1254 // TODO(danvk): update this comment
1255 // The range in second/value units that the viewport encompasses during a
1256 // panning operation.
1259 // Utility function to convert page-wide coordinates to canvas coords
1263 initializeMouseDown
: function(event
, g
, context
) {
1264 // prevents mouse drags from selecting page text.
1265 if (event
.preventDefault
) {
1266 event
.preventDefault(); // Firefox, Chrome, etc.
1268 event
.returnValue
= false; // IE
1269 event
.cancelBubble
= true;
1272 context
.px
= Dygraph
.findPosX(g
.canvas_
);
1273 context
.py
= Dygraph
.findPosY(g
.canvas_
);
1274 context
.dragStartX
= g
.dragGetX_(event
, context
);
1275 context
.dragStartY
= g
.dragGetY_(event
, context
);
1279 var interactionModel
= this.attr_("interactionModel");
1281 // Self is the graph.
1284 // Function that binds the graph and context to the handler.
1285 var bindHandler
= function(handler
) {
1286 return function(event
) {
1287 handler(event
, self
, context
);
1291 for (var eventName
in interactionModel
) {
1292 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1293 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
1294 bindHandler(interactionModel
[eventName
]));
1297 // If the user releases the mouse button during a drag, but not over the
1298 // canvas, then it doesn't count as a zooming action.
1299 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
1300 if (context
.isZooming
|| context
.isPanning
) {
1301 context
.isZooming
= false;
1302 context
.dragStartX
= null;
1303 context
.dragStartY
= null;
1306 if (context
.isPanning
) {
1307 context
.isPanning
= false;
1308 context
.draggingDate
= null;
1309 context
.dateRange
= null;
1310 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1311 delete self
.axes_
[i
].draggingValue
;
1312 delete self
.axes_
[i
].dragValueRange
;
1320 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1321 * up any previous zoom rectangles that were drawn. This could be optimized to
1322 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1325 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1326 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1327 * @param {Number} startX The X position where the drag started, in canvas
1329 * @param {Number} endX The current X position of the drag, in canvas coords.
1330 * @param {Number} startY The Y position where the drag started, in canvas
1332 * @param {Number} endY The current Y position of the drag, in canvas coords.
1333 * @param {Number} prevDirection the value of direction on the previous call to
1334 * this function. Used to avoid excess redrawing
1335 * @param {Number} prevEndX The value of endX on the previous call to this
1336 * function. Used to avoid excess redrawing
1337 * @param {Number} prevEndY The value of endY on the previous call to this
1338 * function. Used to avoid excess redrawing
1341 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1342 endY
, prevDirection
, prevEndX
,
1344 var ctx
= this.canvas_
.getContext("2d");
1346 // Clean up from the previous rect if necessary
1347 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1348 ctx
.clearRect(Math
.min(startX
, prevEndX
), 0,
1349 Math
.abs(startX
- prevEndX
), this.height_
);
1350 } else if (prevDirection
== Dygraph
.VERTICAL
){
1351 ctx
.clearRect(0, Math
.min(startY
, prevEndY
),
1352 this.width_
, Math
.abs(startY
- prevEndY
));
1355 // Draw a light-grey rectangle to show the new viewing area
1356 if (direction
== Dygraph
.HORIZONTAL
) {
1357 if (endX
&& startX
) {
1358 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1359 ctx
.fillRect(Math
.min(startX
, endX
), 0,
1360 Math
.abs(endX
- startX
), this.height_
);
1363 if (direction
== Dygraph
.VERTICAL
) {
1364 if (endY
&& startY
) {
1365 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1366 ctx
.fillRect(0, Math
.min(startY
, endY
),
1367 this.width_
, Math
.abs(endY
- startY
));
1373 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1374 * the canvas. The exact zoom window may be slightly larger if there are no data
1375 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1376 * which accepts dates that match the raw data. This function redraws the graph.
1378 * @param {Number} lowX The leftmost pixel value that should be visible.
1379 * @param {Number} highX The rightmost pixel value that should be visible.
1382 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1383 // Find the earliest and latest dates contained in this canvasx range.
1384 // Convert the call to date ranges of the raw data.
1385 var minDate
= this.toDataXCoord(lowX
);
1386 var maxDate
= this.toDataXCoord(highX
);
1387 this.doZoomXDates_(minDate
, maxDate
);
1391 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1392 * method with doZoomX which accepts pixel coordinates. This function redraws
1395 * @param {Number} minDate The minimum date that should be visible.
1396 * @param {Number} maxDate The maximum date that should be visible.
1399 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1400 this.dateWindow_
= [minDate
, maxDate
];
1402 if (this.attr_("zoomCallback")) {
1403 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1408 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1409 * the canvas. This function redraws the graph.
1411 * @param {Number} lowY The topmost pixel value that should be visible.
1412 * @param {Number} highY The lowest pixel value that should be visible.
1415 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1416 // Find the highest and lowest values in pixel range for each axis.
1417 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1418 // This is because pixels increase as you go down on the screen, whereas data
1419 // coordinates increase as you go up the screen.
1420 var valueRanges
= [];
1421 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1422 var hi
= this.toDataYCoord(lowY
, i
);
1423 var low
= this.toDataYCoord(highY
, i
);
1424 this.axes_
[i
].valueWindow
= [low
, hi
];
1425 valueRanges
.push([low
, hi
]);
1429 if (this.attr_("zoomCallback")) {
1430 var xRange
= this.xAxisRange();
1431 this.attr_("zoomCallback")(xRange
[0], xRange
[1], this.yAxisRanges());
1436 * Reset the zoom to the original view coordinates. This is the same as
1437 * double-clicking on the graph.
1441 Dygraph
.prototype.doUnzoom_
= function() {
1443 if (this.dateWindow_
!= null) {
1445 this.dateWindow_
= null;
1448 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1449 if (this.axes_
[i
].valueWindow
!= null) {
1451 delete this.axes_
[i
].valueWindow
;
1456 // Putting the drawing operation before the callback because it resets
1459 if (this.attr_("zoomCallback")) {
1460 var minDate
= this.rawData_
[0][0];
1461 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1462 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1468 * When the mouse moves in the canvas, display information about a nearby data
1469 * point and draw dots over those points in the data series. This function
1470 * takes care of cleanup of previously-drawn dots.
1471 * @param {Object} event The mousemove event from the browser.
1474 Dygraph
.prototype.mouseMove_
= function(event
) {
1475 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1476 var points
= this.layout_
.points
;
1478 // This prevents JS errors when mousing over the canvas before data loads.
1479 if (points
=== undefined
) return;
1484 // Loop through all the points and find the date nearest to our current
1486 var minDist
= 1e+100;
1488 for (var i
= 0; i
< points
.length
; i
++) {
1489 var point
= points
[i
];
1490 if (point
== null) continue;
1491 var dist
= Math
.abs(point
.canvasx
- canvasx
);
1492 if (dist
> minDist
) continue;
1496 if (idx
>= 0) lastx
= points
[idx
].xval
;
1498 // Extract the points we've selected
1499 this.selPoints_
= [];
1500 var l
= points
.length
;
1501 if (!this.attr_("stackedGraph")) {
1502 for (var i
= 0; i
< l
; i
++) {
1503 if (points
[i
].xval
== lastx
) {
1504 this.selPoints_
.push(points
[i
]);
1508 // Need to 'unstack' points starting from the bottom
1509 var cumulative_sum
= 0;
1510 for (var i
= l
- 1; i
>= 0; i
--) {
1511 if (points
[i
].xval
== lastx
) {
1512 var p
= {}; // Clone the point since we modify it
1513 for (var k
in points
[i
]) {
1514 p
[k
] = points
[i
][k
];
1516 p
.yval
-= cumulative_sum
;
1517 cumulative_sum
+= p
.yval
;
1518 this.selPoints_
.push(p
);
1521 this.selPoints_
.reverse();
1524 if (this.attr_("highlightCallback")) {
1525 var px
= this.lastx_
;
1526 if (px
!== null && lastx
!= px
) {
1527 // only fire if the selected point has changed.
1528 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
, this.idxToRow_(idx
));
1532 // Save last x position for callbacks.
1533 this.lastx_
= lastx
;
1535 this.updateSelection_();
1539 * Transforms layout_.points index into data row number.
1540 * @param int layout_.points index
1541 * @return int row number, or -1 if none could be found.
1544 Dygraph
.prototype.idxToRow_
= function(idx
) {
1545 if (idx
< 0) return -1;
1547 for (var i
in this.layout_
.datasets
) {
1548 if (idx
< this.layout_
.datasets
[i
].length
) {
1549 return this.boundaryIds_
[0][0]+idx
;
1551 idx
-= this.layout_
.datasets
[i
].length
;
1556 Dygraph
.isOK
= function(x
) {
1557 return x
&& !isNaN(x
);
1560 Dygraph
.prototype.generateLegendHTML_
= function(x
, sel_points
) {
1561 var displayDigits
= this.numXDigits_
+ this.numExtraDigits_
;
1562 var html
= this.attr_('xValueFormatter')(x
, displayDigits
) + ":";
1564 var fmtFunc
= this.attr_('yValueFormatter');
1565 var showZeros
= this.attr_("labelsShowZeroValues");
1566 var sepLines
= this.attr_("labelsSeparateLines");
1567 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1568 var pt
= this.selPoints_
[i
];
1569 if (pt
.yval
== 0 && !showZeros
) continue;
1570 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1571 if (sepLines
) html
+= "<br/>";
1573 var c
= new RGBColor(this.plotter_
.colors
[pt
.name
]);
1574 var yval
= fmtFunc(pt
.yval
, displayDigits
);
1575 html
+= " <b><font color='" + c
.toHex() + "'>"
1576 + pt
.name
+ "</font></b>:"
1583 * Draw dots over the selectied points in the data series. This function
1584 * takes care of cleanup of previously-drawn dots.
1587 Dygraph
.prototype.updateSelection_
= function() {
1588 // Clear the previously drawn vertical, if there is one
1589 var ctx
= this.canvas_
.getContext("2d");
1590 if (this.previousVerticalX_
>= 0) {
1591 // Determine the maximum highlight circle size.
1592 var maxCircleSize
= 0;
1593 var labels
= this.attr_('labels');
1594 for (var i
= 1; i
< labels
.length
; i
++) {
1595 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1596 if (r
> maxCircleSize
) maxCircleSize
= r
;
1598 var px
= this.previousVerticalX_
;
1599 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1600 2 * maxCircleSize
+ 2, this.height_
);
1603 if (this.selPoints_
.length
> 0) {
1604 // Set the status message to indicate the selected point(s)
1605 if (this.attr_('showLabelsOnHighlight')) {
1606 var html
= this.generateLegendHTML_(this.lastx_
, this.selPoints_
);
1607 this.attr_("labelsDiv").innerHTML
= html
;
1610 // Draw colored circles over the center of each selected point
1611 var canvasx
= this.selPoints_
[0].canvasx
;
1613 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1614 var pt
= this.selPoints_
[i
];
1615 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1617 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1619 ctx
.fillStyle
= this.plotter_
.colors
[pt
.name
];
1620 ctx
.arc(canvasx
, pt
.canvasy
, circleSize
, 0, 2 * Math
.PI
, false);
1625 this.previousVerticalX_
= canvasx
;
1630 * Set manually set selected dots, and display information about them
1631 * @param int row number that should by highlighted
1632 * false value clears the selection
1635 Dygraph
.prototype.setSelection
= function(row
) {
1636 // Extract the points we've selected
1637 this.selPoints_
= [];
1640 if (row
!== false) {
1641 row
= row
-this.boundaryIds_
[0][0];
1644 if (row
!== false && row
>= 0) {
1645 for (var i
in this.layout_
.datasets
) {
1646 if (row
< this.layout_
.datasets
[i
].length
) {
1647 var point
= this.layout_
.points
[pos
+row
];
1649 if (this.attr_("stackedGraph")) {
1650 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1653 this.selPoints_
.push(point
);
1655 pos
+= this.layout_
.datasets
[i
].length
;
1659 if (this.selPoints_
.length
) {
1660 this.lastx_
= this.selPoints_
[0].xval
;
1661 this.updateSelection_();
1664 this.clearSelection();
1670 * The mouse has left the canvas. Clear out whatever artifacts remain
1671 * @param {Object} event the mouseout event from the browser.
1674 Dygraph
.prototype.mouseOut_
= function(event
) {
1675 if (this.attr_("unhighlightCallback")) {
1676 this.attr_("unhighlightCallback")(event
);
1679 if (this.attr_("hideOverlayOnMouseOut")) {
1680 this.clearSelection();
1685 * Remove all selection from the canvas
1688 Dygraph
.prototype.clearSelection
= function() {
1689 // Get rid of the overlay data
1690 var ctx
= this.canvas_
.getContext("2d");
1691 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1692 this.attr_("labelsDiv").innerHTML
= "";
1693 this.selPoints_
= [];
1698 * Returns the number of the currently selected row
1699 * @return int row number, of -1 if nothing is selected
1702 Dygraph
.prototype.getSelection
= function() {
1703 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1707 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1708 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1709 return row
+ this.boundaryIds_
[0][0];
1715 Dygraph
.zeropad
= function(x
) {
1716 if (x
< 10) return "0" + x
; else return "" + x
;
1720 * Return a string version of the hours, minutes and seconds portion of a date.
1721 * @param {Number} date The JavaScript date (ms since epoch)
1722 * @return {String} A time of the form "HH:MM:SS"
1725 Dygraph
.hmsString_
= function(date
) {
1726 var zeropad
= Dygraph
.zeropad
;
1727 var d
= new Date(date
);
1728 if (d
.getSeconds()) {
1729 return zeropad(d
.getHours()) + ":" +
1730 zeropad(d
.getMinutes()) + ":" +
1731 zeropad(d
.getSeconds());
1733 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
1738 * Convert a JS date to a string appropriate to display on an axis that
1739 * is displaying values at the stated granularity.
1740 * @param {Date} date The date to format
1741 * @param {Number} granularity One of the Dygraph granularity constants
1742 * @return {String} The formatted date
1745 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1746 if (granularity
>= Dygraph
.DECADAL
) {
1747 return date
.strftime('%Y');
1748 } else if (granularity
>= Dygraph
.MONTHLY
) {
1749 return date
.strftime('%b %y');
1751 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1752 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1753 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1755 return Dygraph
.hmsString_(date
.getTime());
1761 * Convert a JS date (millis since epoch) to YYYY/MM/DD
1762 * @param {Number} date The JavaScript date (ms since epoch)
1763 * @return {String} A date of the form "YYYY/MM/DD"
1766 Dygraph
.dateString_
= function(date
) {
1767 var zeropad
= Dygraph
.zeropad
;
1768 var d
= new Date(date
);
1771 var year
= "" + d
.getFullYear();
1772 // Get a 0 padded month string
1773 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
1774 // Get a 0 padded day string
1775 var day
= zeropad(d
.getDate());
1778 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1779 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
1781 return year
+ "/" + month + "/" + day
+ ret
;
1785 * Fires when there's data available to be graphed.
1786 * @param {String} data Raw CSV data to be plotted
1789 Dygraph
.prototype.loadedEvent_
= function(data
) {
1790 this.rawData_
= this.parseCSV_(data
);
1794 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1795 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1796 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1799 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1802 Dygraph
.prototype.addXTicks_
= function() {
1803 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1805 if (this.dateWindow_
) {
1806 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
1808 range
= [this.rawData_
[0][0], this.rawData_
[this.rawData_
.length
- 1][0]];
1811 var formatter
= this.attr_('xTicker');
1812 var ret
= formatter(range
[0], range
[1], this);
1815 // Note: numericTicks() returns a {ticks: [...], numDigits: yy} dictionary,
1816 // whereas dateTicker and user-defined tickers typically just return a ticks
1818 if (ret
.ticks
!== undefined
) {
1820 this.numXDigits_
= ret
.numDigits
;
1825 this.layout_
.updateOptions({xTicks
: xTicks
});
1828 // Time granularity enumeration
1829 Dygraph
.SECONDLY
= 0;
1830 Dygraph
.TWO_SECONDLY
= 1;
1831 Dygraph
.FIVE_SECONDLY
= 2;
1832 Dygraph
.TEN_SECONDLY
= 3;
1833 Dygraph
.THIRTY_SECONDLY
= 4;
1834 Dygraph
.MINUTELY
= 5;
1835 Dygraph
.TWO_MINUTELY
= 6;
1836 Dygraph
.FIVE_MINUTELY
= 7;
1837 Dygraph
.TEN_MINUTELY
= 8;
1838 Dygraph
.THIRTY_MINUTELY
= 9;
1839 Dygraph
.HOURLY
= 10;
1840 Dygraph
.TWO_HOURLY
= 11;
1841 Dygraph
.SIX_HOURLY
= 12;
1843 Dygraph
.WEEKLY
= 14;
1844 Dygraph
.MONTHLY
= 15;
1845 Dygraph
.QUARTERLY
= 16;
1846 Dygraph
.BIANNUAL
= 17;
1847 Dygraph
.ANNUAL
= 18;
1848 Dygraph
.DECADAL
= 19;
1849 Dygraph
.CENTENNIAL
= 20;
1850 Dygraph
.NUM_GRANULARITIES
= 21;
1852 Dygraph
.SHORT_SPACINGS
= [];
1853 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1854 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1855 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1856 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1857 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1858 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1859 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1860 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1861 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1862 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1863 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1864 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1865 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1866 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1867 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1871 // If we used this time granularity, how many ticks would there be?
1872 // This is only an approximation, but it's generally good enough.
1874 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1875 if (granularity
< Dygraph
.MONTHLY
) {
1876 // Generate one tick mark for every fixed interval of time.
1877 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1878 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1880 var year_mod
= 1; // e.g. to only print one point every 10 years.
1881 var num_months
= 12;
1882 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1883 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1884 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1885 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1886 if (granularity
== Dygraph
.CENTENNIAL
) { num_months
= 1; year_mod
= 100; }
1888 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1889 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1890 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1896 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1897 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1899 // Returns an array containing {v: millis, label: label} dictionaries.
1901 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1902 var formatter
= this.attr_("xAxisLabelFormatter");
1904 if (granularity
< Dygraph
.MONTHLY
) {
1905 // Generate one tick mark for every fixed interval of time.
1906 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1907 var format
= '%d%b'; // e.g. "1Jan"
1909 // Find a time less than start_time which occurs on a "nice" time boundary
1910 // for this granularity.
1911 var g
= spacing
/ 1000;
1912 var d
= new Date(start_time
);
1913 if (g
<= 60) { // seconds
1914 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1918 if (g
<= 60) { // minutes
1919 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1924 if (g
<= 24) { // days
1925 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1930 if (g
== 7) { // one week
1931 d
.setDate(d
.getDate() - d
.getDay());
1936 start_time
= d
.getTime();
1938 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1939 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1942 // Display a tick mark on the first of a set of months of each year.
1943 // Years get a tick mark iff y % year_mod == 0. This is useful for
1944 // displaying a tick mark once every 10 years, say, on long time scales.
1946 var year_mod
= 1; // e.g. to only print one point every 10 years.
1948 if (granularity
== Dygraph
.MONTHLY
) {
1949 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1950 } else if (granularity
== Dygraph
.QUARTERLY
) {
1951 months
= [ 0, 3, 6, 9 ];
1952 } else if (granularity
== Dygraph
.BIANNUAL
) {
1954 } else if (granularity
== Dygraph
.ANNUAL
) {
1956 } else if (granularity
== Dygraph
.DECADAL
) {
1959 } else if (granularity
== Dygraph
.CENTENNIAL
) {
1963 this.warn("Span of dates is too long");
1966 var start_year
= new Date(start_time
).getFullYear();
1967 var end_year
= new Date(end_time
).getFullYear();
1968 var zeropad
= Dygraph
.zeropad
;
1969 for (var i
= start_year
; i
<= end_year
; i
++) {
1970 if (i
% year_mod
!= 0) continue;
1971 for (var j
= 0; j
< months
.length
; j
++) {
1972 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1973 var t
= Date
.parse(date_str
);
1974 if (t
< start_time
|| t
> end_time
) continue;
1975 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1985 * Add ticks to the x-axis based on a date range.
1986 * @param {Number} startDate Start of the date window (millis since epoch)
1987 * @param {Number} endDate End of the date window (millis since epoch)
1988 * @return {Array.<Object>} Array of {label, value} tuples.
1991 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1993 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1994 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1995 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
2002 return self
.GetXAxis(startDate
, endDate
, chosen
);
2004 // TODO(danvk): signal error.
2008 // This is a list of human-friendly values at which to show tick marks on a log
2009 // scale. It is k * 10^n, where k=1..9 and n=-39..+39, so:
2010 // ..., 1, 2, 3, 4, 5, ..., 9, 10, 20, 30, ..., 90, 100, 200, 300, ...
2011 // NOTE: this assumes that Dygraph.LOG_SCALE = 10.
2012 Dygraph
.PREFERRED_LOG_TICK_VALUES
= function() {
2014 for (var power
= -39; power
<= 39; power
++) {
2015 var range
= Math
.pow(10, power
);
2016 for (var mult
= 1; mult
<= 9; mult
++) {
2017 var val
= range
* mult
;
2024 // val is the value to search for
2025 // arry is the value over which to search
2026 // if abs > 0, find the lowest entry greater than val
2027 // if abs < 0, find the highest entry less than val
2028 // if abs == 0, find the entry that equals val.
2029 // Currently does not work when val is outside the range of arry's values.
2030 Dygraph
.binarySearch
= function(val
, arry
, abs
, low
, high
) {
2031 if (low
== null || high
== null) {
2033 high
= arry
.length
- 1;
2041 var validIndex
= function(idx
) {
2042 return idx
>= 0 && idx
< arry
.length
;
2044 var mid
= parseInt((low
+ high
) / 2);
2045 var element
= arry
[mid
];
2046 if (element
== val
) {
2049 if (element
> val
) {
2051 // Accept if element > val, but also if prior element < val.
2053 if (validIndex(idx
) && arry
[idx
] < val
) {
2057 return Dygraph
.binarySearch(val
, arry
, abs
, low
, mid
- 1);
2059 if (element
< val
) {
2061 // Accept if element < val, but also if prior element > val.
2063 if (validIndex(idx
) && arry
[idx
] > val
) {
2067 return Dygraph
.binarySearch(val
, arry
, abs
, mid
+ 1, high
);
2072 * Determine the number of significant figures in a Number up to the specified
2073 * precision. Note that there is no way to determine if a trailing '0' is
2074 * significant or not, so by convention we return 1 for all of the following
2075 * inputs: 1, 1.0, 1.00, 1.000 etc.
2076 * @param {Number} x The input value.
2077 * @param {Number} opt_maxPrecision Optional maximum precision to consider.
2078 * Default and maximum allowed value is 13.
2079 * @return {Number} The number of significant figures which is >= 1.
2081 Dygraph
.significantFigures
= function(x
, opt_maxPrecision
) {
2082 var precision
= Math
.max(opt_maxPrecision
|| 13, 13);
2084 // Convert the number to its exponential notation form and work backwards,
2085 // ignoring the 'e+xx' bit. This may seem like a hack, but doing a loop and
2086 // dividing by 10 leads to roundoff errors. By using toExponential(), we let
2087 // the JavaScript interpreter handle the low level bits of the Number for us.
2088 var s
= x
.toExponential(precision
);
2089 var ePos
= s
.lastIndexOf('e'); // -1 case handled by return below.
2091 for (var i
= ePos
- 1; i
>= 0; i
--) {
2093 // Got to the decimal place. We'll call this 1 digit of precision because
2094 // we can't know for sure how many trailing 0s are significant.
2096 } else if (s
[i
] != '0') {
2097 // Found the first non-zero digit. Return the number of characters
2098 // except for the '.'.
2099 return i
; // This is i - 1 + 1 (-1 is for '.', +1 is for 0 based index).
2103 // Occurs if toExponential() doesn't return a string containing 'e', which
2104 // should never happen.
2109 * Add ticks when the x axis has numbers on it (instead of dates)
2110 * TODO(konigsberg): Update comment.
2112 * @param {Number} minV minimum value
2113 * @param {Number} maxV maximum value
2115 * @param {function} attribute accessor function.
2116 * @return {Array.<Object>} Array of {label, value} tuples.
2119 Dygraph
.numericTicks
= function(minV
, maxV
, self
, axis_props
, vals
) {
2120 var attr
= function(k
) {
2121 if (axis_props
&& axis_props
.hasOwnProperty(k
)) return axis_props
[k
];
2122 return self
.attr_(k
);
2127 for (var i
= 0; i
< vals
.length
; i
++) {
2128 ticks
.push({v
: vals
[i
]});
2131 if (axis_props
&& attr("logscale")) {
2132 var pixelsPerTick
= attr('pixelsPerYLabel');
2133 // NOTE(konigsberg): Dan, should self.height_ be self.plotter_.area.h?
2134 var nTicks
= Math
.floor(self
.height_
/ pixelsPerTick
);
2135 var minIdx
= Dygraph
.binarySearch(minV
, Dygraph
.PREFERRED_LOG_TICK_VALUES
, 1);
2136 var maxIdx
= Dygraph
.binarySearch(maxV
, Dygraph
.PREFERRED_LOG_TICK_VALUES
, -1);
2141 maxIdx
= Dygraph
.PREFERRED_LOG_TICK_VALUES
.length
- 1;
2143 // Count the number of tick values would appear, if we can get at least
2144 // nTicks / 4 accept them
.
2145 var lastDisplayed
= null;
2146 if (maxIdx
- minIdx
>= nTicks
/ 4) {
2147 var axisId
= axis_props
.yAxisId
;
2148 for (var idx
= maxIdx
; idx
>= minIdx
; idx
--) {
2149 var tickValue
= Dygraph
.PREFERRED_LOG_TICK_VALUES
[idx
];
2150 var domCoord
= axis_props
.g
.toDomYCoord(tickValue
, axisId
);
2151 var tick
= { v
: tickValue
};
2152 if (lastDisplayed
== null) {
2154 tickValue
: tickValue
,
2158 if (domCoord
- lastDisplayed
.domCoord
>= pixelsPerTick
) {
2160 tickValue
: tickValue
,
2169 // Since we went in backwards order.
2174 // ticks.length won't be 0 if the log scale function finds values to insert.
2175 if (ticks
.length
== 0) {
2177 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
2178 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
2179 // The first spacing greater than pixelsPerYLabel is what we use.
2180 // TODO(danvk): version that works on a log scale.
2181 if (attr("labelsKMG2")) {
2182 var mults
= [1, 2, 4, 8];
2184 var mults
= [1, 2, 5];
2186 var scale
, low_val
, high_val
, nTicks
;
2187 // TODO(danvk): make it possible to set this for x- and y-axes independently.
2188 var pixelsPerTick
= attr('pixelsPerYLabel');
2189 for (var i
= -10; i
< 50; i
++) {
2190 if (attr("labelsKMG2")) {
2191 var base_scale
= Math
.pow(16, i
);
2193 var base_scale
= Math
.pow(10, i
);
2195 for (var j
= 0; j
< mults
.length
; j
++) {
2196 scale
= base_scale
* mults
[j
];
2197 low_val
= Math
.floor(minV
/ scale
) * scale
;
2198 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
2199 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
2200 var spacing
= self
.height_
/ nTicks
;
2201 // wish I could break out of both loops at once...
2202 if (spacing
> pixelsPerTick
) break;
2204 if (spacing
> pixelsPerTick
) break;
2207 // Construct the set of ticks.
2208 // Allow reverse y-axis if it's explicitly requested.
2209 if (low_val
> high_val
) scale
*= -1;
2210 for (var i
= 0; i
< nTicks
; i
++) {
2211 var tickV
= low_val
+ i
* scale
;
2212 ticks
.push( {v
: tickV
} );
2217 // Add formatted labels to the ticks.
2220 if (attr("labelsKMB")) {
2222 k_labels
= [ "K", "M", "B", "T" ];
2224 if (attr("labelsKMG2")) {
2225 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
2227 k_labels
= [ "k", "M", "G", "T" ];
2229 var formatter
= attr('yAxisLabelFormatter') ?
2230 attr('yAxisLabelFormatter') : attr('yValueFormatter');
2232 // Determine the number of decimal places needed for the labels below by
2233 // taking the maximum number of significant figures for any label. We must
2234 // take the max because we can't tell if trailing 0s are significant.
2236 for (var i
= 0; i
< ticks
.length
; i
++) {
2237 numDigits
= Math
.max(Dygraph
.significantFigures(ticks
[i
].v
), numDigits
);
2240 // Add labels to the ticks.
2241 for (var i
= 0; i
< ticks
.length
; i
++) {
2242 if (ticks
[i
].label
!== undefined
) continue; // Use current label.
2243 var tickV
= ticks
[i
].v
;
2244 var absTickV
= Math
.abs(tickV
);
2245 var label
= (formatter
!== undefined
) ?
2246 formatter(tickV
, numDigits
) : tickV
.toPrecision(numDigits
);
2247 if (k_labels
.length
> 0) {
2248 // Round up to an appropriate unit.
2250 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
2251 if (absTickV
>= n
) {
2252 label
= formatter(tickV
/ n
, numDigits
) + k_labels
[j
];
2257 ticks
[i
].label
= label
;
2260 return {ticks
: ticks
, numDigits
: numDigits
};
2263 // Computes the range of the data series (including confidence intervals).
2264 // series is either [ [x1, y1], [x2, y2], ... ] or
2265 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2266 // Returns [low, high]
2267 Dygraph
.prototype.extremeValues_
= function(series
) {
2268 var minY
= null, maxY
= null;
2270 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2272 // With custom bars, maxY is the max of the high values.
2273 for (var j
= 0; j
< series
.length
; j
++) {
2274 var y
= series
[j
][1][0];
2276 var low
= y
- series
[j
][1][1];
2277 var high
= y
+ series
[j
][1][2];
2278 if (low
> y
) low
= y
; // this can happen with custom bars,
2279 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2280 if (maxY
== null || high
> maxY
) {
2283 if (minY
== null || low
< minY
) {
2288 for (var j
= 0; j
< series
.length
; j
++) {
2289 var y
= series
[j
][1];
2290 if (y
=== null || isNaN(y
)) continue;
2291 if (maxY
== null || y
> maxY
) {
2294 if (minY
== null || y
< minY
) {
2300 return [minY
, maxY
];
2304 * This function is called once when the chart's data is changed or the options
2305 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2306 * idea is that values derived from the chart's data can be computed here,
2307 * rather than every time the chart is drawn. This includes things like the
2308 * number of axes, rolling averages, etc.
2310 Dygraph
.prototype.predraw_
= function() {
2311 // TODO(danvk): move more computations out of drawGraph_ and into here.
2312 this.computeYAxes_();
2314 // Create a new plotter.
2315 if (this.plotter_
) this.plotter_
.clear();
2316 this.plotter_
= new DygraphCanvasRenderer(this,
2317 this.hidden_
, this.layout_
,
2318 this.renderOptions_
);
2320 // The roller sits in the bottom left corner of the chart. We don't know where
2321 // this will be until the options are available, so it's positioned here.
2322 this.createRollInterface_();
2324 // Same thing applies for the labelsDiv. It's right edge should be flush with
2325 // the right edge of the charting area (which may not be the same as the right
2326 // edge of the div, if we have two y-axes.
2327 this.positionLabelsDiv_();
2329 // If the data or options have changed, then we'd better redraw.
2334 * Update the graph with new data. This method is called when the viewing area
2335 * has changed. If the underlying data or options have changed, predraw_ will
2336 * be called before drawGraph_ is called.
2339 Dygraph
.prototype.drawGraph_
= function() {
2340 var data
= this.rawData_
;
2342 // This is used to set the second parameter to drawCallback, below.
2343 var is_initial_draw
= this.is_initial_draw_
;
2344 this.is_initial_draw_
= false;
2346 var minY
= null, maxY
= null;
2347 this.layout_
.removeAllDatasets();
2349 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
2351 // Loop over the fields (series). Go from the last to the first,
2352 // because if they're stacked that's how we accumulate the values.
2354 var cumulative_y
= []; // For stacked series.
2357 var extremes
= {}; // series name -> [low, high]
2359 // Loop over all fields and create datasets
2360 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
2361 if (!this.visibility()[i
- 1]) continue;
2363 var seriesName
= this.attr_("labels")[i
];
2364 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
2365 var logScale
= this.attr_('logscale', i
);
2368 for (var j
= 0; j
< data
.length
; j
++) {
2369 var date
= data
[j
][0];
2370 var point
= data
[j
][i
];
2372 // On the log scale, points less than zero do not exist.
2373 // This will create a gap in the chart. Note that this ignores
2374 // connectSeparatedPoints.
2378 series
.push([date
, point
]);
2380 if (point
!= null || !connectSeparatedPoints
) {
2381 series
.push([date
, point
]);
2386 // TODO(danvk): move this into predraw_. It's insane to do it here.
2387 series
= this.rollingAverage(series
, this.rollPeriod_
);
2389 // Prune down to the desired range, if necessary (for zooming)
2390 // Because there can be lines going to points outside of the visible area,
2391 // we actually prune to visible points, plus one on either side.
2392 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2393 if (this.dateWindow_
) {
2394 var low
= this.dateWindow_
[0];
2395 var high
= this.dateWindow_
[1];
2397 // TODO(danvk): do binary search instead of linear search.
2398 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2399 var firstIdx
= null, lastIdx
= null;
2400 for (var k
= 0; k
< series
.length
; k
++) {
2401 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2404 if (series
[k
][0] <= high
) {
2408 if (firstIdx
=== null) firstIdx
= 0;
2409 if (firstIdx
> 0) firstIdx
--;
2410 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2411 if (lastIdx
< series
.length
- 1) lastIdx
++;
2412 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
2413 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
2414 pruned
.push(series
[k
]);
2418 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
2421 var seriesExtremes
= this.extremeValues_(series
);
2424 for (var j
=0; j
<series
.length
; j
++) {
2425 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
2428 } else if (this.attr_("stackedGraph")) {
2429 var l
= series
.length
;
2431 for (var j
= 0; j
< l
; j
++) {
2432 // If one data set has a NaN, let all subsequent stacked
2433 // sets inherit the NaN -- only start at 0 for the first set.
2434 var x
= series
[j
][0];
2435 if (cumulative_y
[x
] === undefined
) {
2436 cumulative_y
[x
] = 0;
2439 actual_y
= series
[j
][1];
2440 cumulative_y
[x
] += actual_y
;
2442 series
[j
] = [x
, cumulative_y
[x
]]
2444 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2445 seriesExtremes
[1] = cumulative_y
[x
];
2447 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2448 seriesExtremes
[0] = cumulative_y
[x
];
2452 extremes
[seriesName
] = seriesExtremes
;
2454 datasets
[i
] = series
;
2457 for (var i
= 1; i
< datasets
.length
; i
++) {
2458 if (!this.visibility()[i
- 1]) continue;
2459 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
2462 this.computeYAxisRanges_(extremes
);
2463 this.layout_
.updateOptions( { yAxes
: this.axes_
,
2464 seriesToAxisMap
: this.seriesToAxisMap_
2469 // Tell PlotKit to use this new data and render itself
2470 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
2471 this.layout_
.evaluateWithError();
2472 this.plotter_
.clear();
2473 this.plotter_
.render();
2474 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2475 this.canvas_
.height
);
2477 if (this.attr_("drawCallback") !== null) {
2478 this.attr_("drawCallback")(this, is_initial_draw
);
2483 * Determine properties of the y-axes which are independent of the data
2484 * currently being displayed. This includes things like the number of axes and
2485 * the style of the axes. It does not include the range of each axis and its
2487 * This fills in this.axes_ and this.seriesToAxisMap_.
2488 * axes_ = [ { options } ]
2489 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2490 * indices are into the axes_ array.
2492 Dygraph
.prototype.computeYAxes_
= function() {
2493 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2494 this.seriesToAxisMap_
= {};
2496 // Get a list of series names.
2497 var labels
= this.attr_("labels");
2499 for (var i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2501 // all options which could be applied per-axis:
2509 'axisLabelFontSize',
2514 // Copy global axis options over to the first axis.
2515 for (var i
= 0; i
< axisOptions
.length
; i
++) {
2516 var k
= axisOptions
[i
];
2517 var v
= this.attr_(k
);
2518 if (v
) this.axes_
[0][k
] = v
;
2521 // Go through once and add all the axes.
2522 for (var seriesName
in series
) {
2523 if (!series
.hasOwnProperty(seriesName
)) continue;
2524 var axis
= this.attr_("axis", seriesName
);
2526 this.seriesToAxisMap_
[seriesName
] = 0;
2529 if (typeof(axis
) == 'object') {
2530 // Add a new axis, making a copy of its per-axis options.
2532 Dygraph
.update(opts
, this.axes_
[0]);
2533 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2534 var yAxisId
= this.axes_
.length
;
2535 opts
.yAxisId
= yAxisId
;
2537 Dygraph
.update(opts
, axis
);
2538 this.axes_
.push(opts
);
2539 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2543 // Go through one more time and assign series to an axis defined by another
2544 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2545 for (var seriesName
in series
) {
2546 if (!series
.hasOwnProperty(seriesName
)) continue;
2547 var axis
= this.attr_("axis", seriesName
);
2548 if (typeof(axis
) == 'string') {
2549 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2550 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2551 "series " + axis
+ ", which does not define its own axis.");
2554 var idx
= this.seriesToAxisMap_
[axis
];
2555 this.seriesToAxisMap_
[seriesName
] = idx
;
2559 // Now we remove series from seriesToAxisMap_ which are not visible. We do
2560 // this last so that hiding the first series doesn't destroy the axis
2561 // properties of the primary axis.
2562 var seriesToAxisFiltered
= {};
2563 var vis
= this.visibility();
2564 for (var i
= 1; i
< labels
.length
; i
++) {
2566 if (vis
[i
- 1]) seriesToAxisFiltered
[s
] = this.seriesToAxisMap_
[s
];
2568 this.seriesToAxisMap_
= seriesToAxisFiltered
;
2572 * Returns the number of y-axes on the chart.
2573 * @return {Number} the number of axes.
2575 Dygraph
.prototype.numAxes
= function() {
2577 for (var series
in this.seriesToAxisMap_
) {
2578 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2579 var idx
= this.seriesToAxisMap_
[series
];
2580 if (idx
> last_axis
) last_axis
= idx
;
2582 return 1 + last_axis
;
2586 * Determine the value range and tick marks for each axis.
2587 * @param {Object} extremes A mapping from seriesName -> [low, high]
2588 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2590 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2591 // Build a map from axis number -> [list of series names]
2592 var seriesForAxis
= [];
2593 for (var series
in this.seriesToAxisMap_
) {
2594 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2595 var idx
= this.seriesToAxisMap_
[series
];
2596 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2597 seriesForAxis
[idx
].push(series
);
2600 // Compute extreme values, a span and tick marks for each axis.
2601 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2602 var axis
= this.axes_
[i
];
2603 if (axis
.valueWindow
) {
2604 // This is only set if the user has zoomed on the y-axis. It is never set
2605 // by a user. It takes precedence over axis.valueRange because, if you set
2606 // valueRange, you'd still expect to be able to pan.
2607 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2608 } else if (axis
.valueRange
) {
2609 // This is a user-set value range for this axis.
2610 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2612 // Calculate the extremes of extremes.
2613 var series
= seriesForAxis
[i
];
2614 var minY
= Infinity
; // extremes[series[0]][0];
2615 var maxY
= -Infinity
; // extremes[series[0]][1];
2616 for (var j
= 0; j
< series
.length
; j
++) {
2617 minY
= Math
.min(extremes
[series
[j
]][0], minY
);
2618 maxY
= Math
.max(extremes
[series
[j
]][1], maxY
);
2620 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2622 // Add some padding and round up to an integer to be human-friendly.
2623 var span
= maxY
- minY
;
2624 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2625 if (span
== 0) { span
= maxY
; }
2629 if (axis
.logscale
) {
2630 var maxAxisY
= maxY
+ 0.1 * span
;
2631 var minAxisY
= minY
;
2633 var maxAxisY
= maxY
+ 0.1 * span
;
2634 var minAxisY
= minY
- 0.1 * span
;
2636 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2637 if (!this.attr_("avoidMinZero")) {
2638 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2639 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2642 if (this.attr_("includeZero")) {
2643 if (maxY
< 0) maxAxisY
= 0;
2644 if (minY
> 0) minAxisY
= 0;
2648 axis
.computedValueRange
= [minAxisY
, maxAxisY
];
2651 // Add ticks. By default, all axes inherit the tick positions of the
2652 // primary axis. However, if an axis is specifically marked as having
2653 // independent ticks, then that is permissible as well.
2654 if (i
== 0 || axis
.independentTicks
) {
2656 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2657 axis
.computedValueRange
[1],
2660 axis
.ticks
= ret
.ticks
;
2661 this.numYDigits_
= ret
.numDigits
;
2663 var p_axis
= this.axes_
[0];
2664 var p_ticks
= p_axis
.ticks
;
2665 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2666 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2667 var tick_values
= [];
2668 for (var i
= 0; i
< p_ticks
.length
; i
++) {
2669 var y_frac
= (p_ticks
[i
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2670 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2671 tick_values
.push(y_val
);
2675 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2676 axis
.computedValueRange
[1],
2677 this, axis
, tick_values
);
2678 axis
.ticks
= ret
.ticks
;
2679 this.numYDigits_
= ret
.numDigits
;
2685 * Calculates the rolling average of a data set.
2686 * If originalData is [label, val], rolls the average of those.
2687 * If originalData is [label, [, it's interpreted as [value, stddev]
2688 * and the roll is returned in the same form, with appropriately reduced
2689 * stddev for each value.
2690 * Note that this is where fractional input (i.e. '5/10') is converted into
2692 * @param {Array} originalData The data in the appropriate format (see above)
2693 * @param {Number} rollPeriod The number of points over which to average the
2696 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2697 if (originalData
.length
< 2)
2698 return originalData
;
2699 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
2700 var rollingData
= [];
2701 var sigma
= this.attr_("sigma");
2703 if (this.fractions_
) {
2705 var den
= 0; // numerator/denominator
2707 for (var i
= 0; i
< originalData
.length
; i
++) {
2708 num
+= originalData
[i
][1][0];
2709 den
+= originalData
[i
][1][1];
2710 if (i
- rollPeriod
>= 0) {
2711 num
-= originalData
[i
- rollPeriod
][1][0];
2712 den
-= originalData
[i
- rollPeriod
][1][1];
2715 var date
= originalData
[i
][0];
2716 var value
= den
? num
/ den
: 0.0;
2717 if (this.attr_("errorBars")) {
2718 if (this.wilsonInterval_
) {
2719 // For more details on this confidence interval, see:
2720 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2722 var p
= value
< 0 ? 0 : value
, n
= den
;
2723 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2724 var denom
= 1 + sigma
* sigma
/ den
;
2725 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2726 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2727 rollingData
[i
] = [date
,
2728 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2730 rollingData
[i
] = [date
, [0, 0, 0]];
2733 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2734 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2737 rollingData
[i
] = [date
, mult
* value
];
2740 } else if (this.attr_("customBars")) {
2745 for (var i
= 0; i
< originalData
.length
; i
++) {
2746 var data
= originalData
[i
][1];
2748 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2750 if (y
!= null && !isNaN(y
)) {
2756 if (i
- rollPeriod
>= 0) {
2757 var prev
= originalData
[i
- rollPeriod
];
2758 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
2765 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2766 1.0 * (mid
- low
) / count
,
2767 1.0 * (high
- mid
) / count
]];
2770 // Calculate the rolling average for the first rollPeriod - 1 points where
2771 // there is not enough data to roll over the full number of points
2772 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
2773 if (!this.attr_("errorBars")){
2774 if (rollPeriod
== 1) {
2775 return originalData
;
2778 for (var i
= 0; i
< originalData
.length
; i
++) {
2781 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2782 var y
= originalData
[j
][1];
2783 if (y
== null || isNaN(y
)) continue;
2785 sum
+= originalData
[j
][1];
2788 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2790 rollingData
[i
] = [originalData
[i
][0], null];
2795 for (var i
= 0; i
< originalData
.length
; i
++) {
2799 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2800 var y
= originalData
[j
][1][0];
2801 if (y
== null || isNaN(y
)) continue;
2803 sum
+= originalData
[j
][1][0];
2804 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2807 var stddev
= Math
.sqrt(variance
) / num_ok
;
2808 rollingData
[i
] = [originalData
[i
][0],
2809 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2811 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2821 * Parses a date, returning the number of milliseconds since epoch. This can be
2822 * passed in as an xValueParser in the Dygraph constructor.
2823 * TODO(danvk): enumerate formats that this understands.
2824 * @param {String} A date in YYYYMMDD format.
2825 * @return {Number} Milliseconds since epoch.
2828 Dygraph
.dateParser
= function(dateStr
, self
) {
2831 if (dateStr
.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12'
2832 dateStrSlashed
= dateStr
.replace("-", "/", "g");
2833 while (dateStrSlashed
.search("-") != -1) {
2834 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
2836 d
= Date
.parse(dateStrSlashed
);
2837 } else if (dateStr
.length
== 8) { // e.g. '20090712'
2838 // TODO(danvk): remove support for this format. It's confusing.
2839 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
2840 + "/" + dateStr
.substr(6,2);
2841 d
= Date
.parse(dateStrSlashed
);
2843 // Any format that Date.parse will accept, e.g. "2009/07/12" or
2844 // "2009/07/12 12:34:56"
2845 d
= Date
.parse(dateStr
);
2848 if (!d
|| isNaN(d
)) {
2849 self
.error("Couldn't parse " + dateStr
+ " as a date");
2855 * Detects the type of the str (date or numeric) and sets the various
2856 * formatting attributes in this.attrs_ based on this type.
2857 * @param {String} str An x value.
2860 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2862 if (str
.indexOf('-') > 0 ||
2863 str
.indexOf('/') >= 0 ||
2864 isNaN(parseFloat(str
))) {
2866 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2867 // TODO(danvk): remove support for this format.
2872 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2873 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2874 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2875 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2877 this.attrs_
.xValueFormatter
= this.attrs_
.yValueFormatter
;
2878 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2879 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2880 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2885 * Parses the value as a floating point number. This is like the parseFloat()
2886 * built-in, but with a few differences:
2887 * - the empty string is parsed as null, rather than NaN.
2888 * - if the string cannot be parsed at all, an error is logged.
2889 * If the string can't be parsed, this method returns null.
2890 * @param {String} x The string to be parsed
2891 * @param {Number} opt_line_no The line number from which the string comes.
2892 * @param {String} opt_line The text of the line from which the string comes.
2896 // Parse the x as a float or return null if it's not a number.
2897 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2898 var val
= parseFloat(x
);
2899 if (!isNaN(val
)) return val
;
2901 // Try to figure out what happeend.
2902 // If the value is the empty string, parse it as null.
2903 if (/^ *$/.test(x
)) return null;
2905 // If it was actually "NaN", return it as NaN.
2906 if (/^ *nan *$/i.test(x
)) return NaN
;
2908 // Looks like a parsing error.
2909 var msg
= "Unable to parse '" + x
+ "' as a number";
2910 if (opt_line
!== null && opt_line_no
!== null) {
2911 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2919 * Parses a string in a special csv format. We expect a csv file where each
2920 * line is a date point, and the first field in each line is the date string.
2921 * We also expect that all remaining fields represent series.
2922 * if the errorBars attribute is set, then interpret the fields as:
2923 * date, series1, stddev1, series2, stddev2, ...
2924 * @param {Array.<Object>} data See above.
2927 * @return Array.<Object> An array with one entry for each row. These entries
2928 * are an array of cells in that row. The first entry is the parsed x-value for
2929 * the row. The second, third, etc. are the y-values. These can take on one of
2930 * three forms, depending on the CSV and constructor parameters:
2932 * 2. [ value, stddev ]
2933 * 3. [ low value, center value, high value ]
2935 Dygraph
.prototype.parseCSV_
= function(data
) {
2937 var lines
= data
.split("\n");
2939 // Use the default delimiter or fall back to a tab if that makes sense.
2940 var delim
= this.attr_('delimiter');
2941 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2946 if (this.labelsFromCSV_
) {
2948 this.attrs_
.labels
= lines
[0].split(delim
);
2953 var defaultParserSet
= false; // attempt to auto-detect x value type
2954 var expectedCols
= this.attr_("labels").length
;
2955 var outOfOrder
= false;
2956 for (var i
= start
; i
< lines
.length
; i
++) {
2957 var line
= lines
[i
];
2959 if (line
.length
== 0) continue; // skip blank lines
2960 if (line
[0] == '#') continue; // skip comment lines
2961 var inFields
= line
.split(delim
);
2962 if (inFields
.length
< 2) continue;
2965 if (!defaultParserSet
) {
2966 this.detectTypeFromString_(inFields
[0]);
2967 xParser
= this.attr_("xValueParser");
2968 defaultParserSet
= true;
2970 fields
[0] = xParser(inFields
[0], this);
2972 // If fractions are expected, parse the numbers as "A/B
"
2973 if (this.fractions_) {
2974 for (var j = 1; j < inFields.length; j++) {
2975 // TODO(danvk): figure out an appropriate way to flag parse errors.
2976 var vals = inFields[j].split("/");
2977 if (vals.length != 2) {
2978 this.error('Expected fractional "num
/den
" values in CSV data ' +
2979 "but found a value
'" + inFields[j] + "' on line
" +
2980 (1 + i) + " ('" + line + "') which is not of
this form
.");
2983 fields[j] = [this.parseFloat_(vals[0], i, line),
2984 this.parseFloat_(vals[1], i, line)];
2987 } else if (this.attr_("errorBars
")) {
2988 // If there are error bars, values are (value, stddev) pairs
2989 if (inFields.length % 2 != 1) {
2990 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2991 'but line ' + (1 + i) + ' has an odd number of values (' +
2992 (inFields.length - 1) + "): '" + line + "'");
2994 for (var j = 1; j < inFields.length; j += 2) {
2995 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2996 this.parseFloat_(inFields[j + 1], i, line)];
2998 } else if (this.attr_("customBars
")) {
2999 // Bars are a low;center;high tuple
3000 for (var j = 1; j < inFields.length; j++) {
3001 var vals = inFields[j].split(";");
3002 fields[j] = [ this.parseFloat_(vals[0], i, line),
3003 this.parseFloat_(vals[1], i, line),
3004 this.parseFloat_(vals[2], i, line) ];
3007 // Values are just numbers
3008 for (var j = 1; j < inFields.length; j++) {
3009 fields[j] = this.parseFloat_(inFields[j], i, line);
3012 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
3016 if (fields.length != expectedCols) {
3017 this.error("Number of columns
in line
" + i + " (" + fields.length +
3018 ") does not agree
with number of
labels (" + expectedCols +
3022 // If the user specified the 'labels' option and none of the cells of the
3023 // first row parsed correctly, then they probably double-specified the
3024 // labels. We go with the values set in the option, discard this row and
3025 // log a warning to the JS console.
3026 if (i == 0 && this.attr_('labels')) {
3027 var all_null = true;
3028 for (var j = 0; all_null && j < fields.length; j++) {
3029 if (fields[j]) all_null = false;
3032 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3033 "CSV
data ('" + line + "') appears to also contain labels
. " +
3034 "Will drop the CSV labels and
use the option labels
.");
3042 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3043 ret.sort(function(a,b) { return a[0] - b[0] });
3050 * The user has provided their data as a pre-packaged JS array. If the x values
3051 * are numeric, this is the same as dygraphs' internal format. If the x values
3052 * are dates, we need to convert them from Date objects to ms since epoch.
3053 * @param {Array.<Object>} data
3054 * @return {Array.<Object>} data with numeric x values.
3056 Dygraph.prototype.parseArray_ = function(data) {
3057 // Peek at the first x value to see if it's numeric.
3058 if (data.length == 0) {
3059 this.error("Can
't plot empty data set");
3062 if (data[0].length == 0) {
3063 this.error("Data set cannot contain an empty row");
3067 if (this.attr_("labels") == null) {
3068 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3069 "in the options parameter");
3070 this.attrs_.labels = [ "X" ];
3071 for (var i = 1; i < data[0].length; i++) {
3072 this.attrs_.labels.push("Y" + i);
3076 if (Dygraph.isDateLike(data[0][0])) {
3077 // Some intelligent defaults for a date x-axis.
3078 this.attrs_.xValueFormatter = Dygraph.dateString_;
3079 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
3080 this.attrs_.xTicker = Dygraph.dateTicker;
3082 // Assume they're all dates
.
3083 var parsedData
= Dygraph
.clone(data
);
3084 for (var i
= 0; i
< data
.length
; i
++) {
3085 if (parsedData
[i
].length
== 0) {
3086 this.error("Row " + (1 + i
) + " of data is empty");
3089 if (parsedData
[i
][0] == null
3090 || typeof(parsedData
[i
][0].getTime
) != 'function'
3091 || isNaN(parsedData
[i
][0].getTime())) {
3092 this.error("x value in row " + (1 + i
) + " is not a Date");
3095 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3099 // Some intelligent defaults for a numeric x-axis.
3100 this.attrs_
.xValueFormatter
= this.attrs_
.yValueFormatter
;
3101 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
3107 * Parses a DataTable object from gviz.
3108 * The data is expected to have a first column that is either a date or a
3109 * number. All subsequent columns must be numbers. If there is a clear mismatch
3110 * between this.xValueParser_ and the type of the first column, it will be
3111 * fixed. Fills out rawData_.
3112 * @param {Array.<Object>} data See above.
3115 Dygraph
.prototype.parseDataTable_
= function(data
) {
3116 var cols
= data
.getNumberOfColumns();
3117 var rows
= data
.getNumberOfRows();
3119 var indepType
= data
.getColumnType(0);
3120 if (indepType
== 'date' || indepType
== 'datetime') {
3121 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
3122 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3123 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
3124 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3125 } else if (indepType
== 'number') {
3126 this.attrs_
.xValueFormatter
= this.attrs_
.yValueFormatter
;
3127 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3128 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
3129 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
3131 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3132 "column 1 of DataTable input (Got '" + indepType
+ "')");
3136 // Array of the column indices which contain data (and not annotations).
3138 var annotationCols
= {}; // data index -> [annotation cols]
3139 var hasAnnotations
= false;
3140 for (var i
= 1; i
< cols
; i
++) {
3141 var type
= data
.getColumnType(i
);
3142 if (type
== 'number') {
3144 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3145 // This is OK -- it's an annotation column.
3146 var dataIdx
= colIdx
[colIdx
.length
- 1];
3147 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3148 annotationCols
[dataIdx
] = [i
];
3150 annotationCols
[dataIdx
].push(i
);
3152 hasAnnotations
= true;
3154 this.error("Only 'number' is supported as a dependent type with Gviz." +
3155 " 'string' is only supported if displayAnnotations is true");
3159 // Read column labels
3160 // TODO(danvk): add support back for errorBars
3161 var labels
= [data
.getColumnLabel(0)];
3162 for (var i
= 0; i
< colIdx
.length
; i
++) {
3163 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3164 if (this.attr_("errorBars")) i
+= 1;
3166 this.attrs_
.labels
= labels
;
3167 cols
= labels
.length
;
3170 var outOfOrder
= false;
3171 var annotations
= [];
3172 for (var i
= 0; i
< rows
; i
++) {
3174 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3175 data
.getValue(i
, 0) === null) {
3176 this.warn("Ignoring row " + i
+
3177 " of DataTable because of undefined or null first column.");
3181 if (indepType
== 'date' || indepType
== 'datetime') {
3182 row
.push(data
.getValue(i
, 0).getTime());
3184 row
.push(data
.getValue(i
, 0));
3186 if (!this.attr_("errorBars")) {
3187 for (var j
= 0; j
< colIdx
.length
; j
++) {
3188 var col
= colIdx
[j
];
3189 row
.push(data
.getValue(i
, col
));
3190 if (hasAnnotations
&&
3191 annotationCols
.hasOwnProperty(col
) &&
3192 data
.getValue(i
, annotationCols
[col
][0]) != null) {
3194 ann
.series
= data
.getColumnLabel(col
);
3196 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
3198 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3199 if (k
) ann
.text
+= "\n";
3200 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3202 annotations
.push(ann
);
3206 for (var j
= 0; j
< cols
- 1; j
++) {
3207 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3210 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3214 // Strip out infinities, which give dygraphs problems later on.
3215 for (var j
= 0; j
< row
.length
; j
++) {
3216 if (!isFinite(row
[j
])) row
[j
] = null;
3222 this.warn("DataTable is out of order; order it correctly to speed loading.");
3223 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
3225 this.rawData_
= ret
;
3227 if (annotations
.length
> 0) {
3228 this.setAnnotations(annotations
, true);
3232 // These functions are all based on MochiKit.
3233 Dygraph
.update
= function (self
, o
) {
3234 if (typeof(o
) != 'undefined' && o
!== null) {
3236 if (o
.hasOwnProperty(k
)) {
3244 Dygraph
.isArrayLike
= function (o
) {
3245 var typ
= typeof(o
);
3247 (typ
!= 'object' && !(typ
== 'function' &&
3248 typeof(o
.item
) == 'function')) ||
3250 typeof(o
.length
) != 'number' ||
3258 Dygraph
.isDateLike
= function (o
) {
3259 if (typeof(o
) != "object" || o
=== null ||
3260 typeof(o
.getTime
) != 'function') {
3266 Dygraph
.clone
= function(o
) {
3267 // TODO(danvk): figure out how MochiKit's version works
3269 for (var i
= 0; i
< o
.length
; i
++) {
3270 if (Dygraph
.isArrayLike(o
[i
])) {
3271 r
.push(Dygraph
.clone(o
[i
]));
3281 * Get the CSV data. If it's in a function, call that function. If it's in a
3282 * file, do an XMLHttpRequest to get it.
3285 Dygraph
.prototype.start_
= function() {
3286 if (typeof this.file_
== 'function') {
3287 // CSV string. Pretend we got it via XHR.
3288 this.loadedEvent_(this.file_());
3289 } else if (Dygraph
.isArrayLike(this.file_
)) {
3290 this.rawData_
= this.parseArray_(this.file_
);
3292 } else if (typeof this.file_
== 'object' &&
3293 typeof this.file_
.getColumnRange
== 'function') {
3294 // must be a DataTable from gviz.
3295 this.parseDataTable_(this.file_
);
3297 } else if (typeof this.file_
== 'string') {
3298 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3299 if (this.file_
.indexOf('\n') >= 0) {
3300 this.loadedEvent_(this.file_
);
3302 var req
= new XMLHttpRequest();
3304 req
.onreadystatechange
= function () {
3305 if (req
.readyState
== 4) {
3306 if (req
.status
== 200) {
3307 caller
.loadedEvent_(req
.responseText
);
3312 req
.open("GET", this.file_
, true);
3316 this.error("Unknown data format: " + (typeof this.file_
));
3321 * Changes various properties of the graph. These can include:
3323 * <li>file: changes the source data for the graph</li>
3324 * <li>errorBars: changes whether the data contains stddev</li>
3326 * @param {Object} attrs The new properties and values
3328 Dygraph
.prototype.updateOptions
= function(attrs
) {
3329 // TODO(danvk): this is a mess. Rethink this function.
3330 if ('rollPeriod' in attrs
) {
3331 this.rollPeriod_
= attrs
.rollPeriod
;
3333 if ('dateWindow' in attrs
) {
3334 this.dateWindow_
= attrs
.dateWindow
;
3337 // TODO(danvk): validate per-series options.
3342 // highlightCircleSize
3344 Dygraph
.update(this.user_attrs_
, attrs
);
3345 Dygraph
.update(this.renderOptions_
, attrs
);
3347 this.labelsFromCSV_
= (this.attr_("labels") == null);
3349 // TODO(danvk): this doesn't match the constructor logic
3350 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
3351 if (attrs
['file']) {
3352 this.file_
= attrs
['file'];
3360 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3361 * containing div (which has presumably changed size since the dygraph was
3362 * instantiated. If the width/height are specified, the div will be resized.
3364 * This is far more efficient than destroying and re-instantiating a
3365 * Dygraph, since it doesn't have to reparse the underlying data.
3367 * @param {Number} width Width (in pixels)
3368 * @param {Number} height Height (in pixels)
3370 Dygraph
.prototype.resize
= function(width
, height
) {
3371 if (this.resize_lock
) {
3374 this.resize_lock
= true;
3376 if ((width
=== null) != (height
=== null)) {
3377 this.warn("Dygraph.resize() should be called with zero parameters or " +
3378 "two non-NULL parameters. Pretending it was zero.");
3379 width
= height
= null;
3382 // TODO(danvk): there should be a clear() method.
3383 this.maindiv_
.innerHTML
= "";
3384 this.attrs_
.labelsDiv
= null;
3387 this.maindiv_
.style
.width
= width
+ "px";
3388 this.maindiv_
.style
.height
= height
+ "px";
3389 this.width_
= width
;
3390 this.height_
= height
;
3392 this.width_
= this.maindiv_
.offsetWidth
;
3393 this.height_
= this.maindiv_
.offsetHeight
;
3396 this.createInterface_();
3399 this.resize_lock
= false;
3403 * Adjusts the number of points in the rolling average. Updates the graph to
3404 * reflect the new averaging period.
3405 * @param {Number} length Number of points over which to average the data.
3407 Dygraph
.prototype.adjustRoll
= function(length
) {
3408 this.rollPeriod_
= length
;
3413 * Returns a boolean array of visibility statuses.
3415 Dygraph
.prototype.visibility
= function() {
3416 // Do lazy-initialization, so that this happens after we know the number of
3418 if (!this.attr_("visibility")) {
3419 this.attrs_
["visibility"] = [];
3421 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
3422 this.attr_("visibility").push(true);
3424 return this.attr_("visibility");
3428 * Changes the visiblity of a series.
3430 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3431 var x
= this.visibility();
3432 if (num
< 0 || num
>= x
.length
) {
3433 this.warn("invalid series number in setVisibility: " + num
);
3441 * Update the list of annotations and redraw the chart.
3443 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3444 // Only add the annotation CSS rule once we know it will be used.
3445 Dygraph
.addAnnotationRule();
3446 this.annotations_
= ann
;
3447 this.layout_
.setAnnotations(this.annotations_
);
3448 if (!suppressDraw
) {
3454 * Return the list of annotations.
3456 Dygraph
.prototype.annotations
= function() {
3457 return this.annotations_
;
3461 * Get the index of a series (column) given its name. The first column is the
3462 * x-axis, so the data series start with index 1.
3464 Dygraph
.prototype.indexFromSetName
= function(name
) {
3465 var labels
= this.attr_("labels");
3466 for (var i
= 0; i
< labels
.length
; i
++) {
3467 if (labels
[i
] == name
) return i
;
3472 Dygraph
.addAnnotationRule
= function() {
3473 if (Dygraph
.addedAnnotationCSS
) return;
3475 var rule
= "border: 1px solid black; " +
3476 "background-color: white; " +
3477 "text-align: center;";
3479 var styleSheetElement
= document
.createElement("style");
3480 styleSheetElement
.type
= "text/css";
3481 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3483 // Find the first style sheet that we can access.
3484 // We may not add a rule to a style sheet from another domain for security
3485 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3486 // adds its own style sheets from google.com.
3487 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3488 if (document
.styleSheets
[i
].disabled
) continue;
3489 var mysheet
= document
.styleSheets
[i
];
3491 if (mysheet
.insertRule
) { // Firefox
3492 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3493 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3494 } else if (mysheet
.addRule
) { // IE
3495 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3497 Dygraph
.addedAnnotationCSS
= true;
3500 // Was likely a security exception.
3504 this.warn("Unable to add default annotation CSS rule; display may be off.");
3508 * Create a new canvas element. This is more complex than a simple
3509 * document.createElement("canvas") because of IE and excanvas.
3511 Dygraph
.createCanvas
= function() {
3512 var canvas
= document
.createElement("canvas");
3514 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
3515 if (isIE
&& (typeof(G_vmlCanvasManager
) != 'undefined')) {
3516 canvas
= G_vmlCanvasManager
.initElement(canvas
);
3524 * A wrapper around Dygraph that implements the gviz API.
3525 * @param {Object} container The DOM object the visualization should live in.
3527 Dygraph
.GVizChart
= function(container
) {
3528 this.container
= container
;
3531 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
3532 // Clear out any existing dygraph.
3533 // TODO(danvk): would it make more sense to simply redraw using the current
3534 // date_graph object?
3535 this.container
.innerHTML
= '';
3536 if (typeof(this.date_graph
) != 'undefined') {
3537 this.date_graph
.destroy();
3540 this.date_graph
= new Dygraph(this.container
, data
, options
);
3544 * Google charts compatible setSelection
3545 * Only row selection is supported, all points in the row will be highlighted
3546 * @param {Array} array of the selected cells
3549 Dygraph
.GVizChart
.prototype.setSelection
= function(selection_array
) {
3551 if (selection_array
.length
) {
3552 row
= selection_array
[0].row
;
3554 this.date_graph
.setSelection(row
);
3558 * Google charts compatible getSelection implementation
3559 * @return {Array} array of the selected cells
3562 Dygraph
.GVizChart
.prototype.getSelection
= function() {
3565 var row
= this.date_graph
.getSelection();
3567 if (row
< 0) return selection
;
3570 for (var i
in this.date_graph
.layout_
.datasets
) {
3571 selection
.push({row
: row
, column
: col
});
3578 // Older pages may still use this name.
3579 DateGraph
= Dygraph
;