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
;
1557 * Draw dots over the selectied points in the data series. This function
1558 * takes care of cleanup of previously-drawn dots.
1561 Dygraph
.prototype.updateSelection_
= function() {
1562 // Clear the previously drawn vertical, if there is one
1563 var ctx
= this.canvas_
.getContext("2d");
1564 if (this.previousVerticalX_
>= 0) {
1565 // Determine the maximum highlight circle size.
1566 var maxCircleSize
= 0;
1567 var labels
= this.attr_('labels');
1568 for (var i
= 1; i
< labels
.length
; i
++) {
1569 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1570 if (r
> maxCircleSize
) maxCircleSize
= r
;
1572 var px
= this.previousVerticalX_
;
1573 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1574 2 * maxCircleSize
+ 2, this.height_
);
1577 var isOK
= function(x
) { return x
&& !isNaN(x
); };
1579 if (this.selPoints_
.length
> 0) {
1580 var canvasx
= this.selPoints_
[0].canvasx
;
1582 // Set the status message to indicate the selected point(s)
1583 var replace
= this.attr_('xValueFormatter')(
1584 this.lastx_
, this.numXDigits_
+ this.numExtraDigits_
) + ":";
1585 var fmtFunc
= this.attr_('yValueFormatter');
1586 var clen
= this.colors_
.length
;
1588 if (this.attr_('showLabelsOnHighlight')) {
1589 // Set the status message to indicate the selected point(s)
1590 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1591 if (!this.attr_("labelsShowZeroValues") && this.selPoints_
[i
].yval
== 0) continue;
1592 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1593 if (this.attr_("labelsSeparateLines")) {
1596 var point
= this.selPoints_
[i
];
1597 var c
= new RGBColor(this.plotter_
.colors
[point
.name
]);
1598 var yval
= fmtFunc(point
.yval
, this.numYDigits_
+ this.numExtraDigits_
);
1599 replace
+= " <b><font color='" + c
.toHex() + "'>"
1600 + point
.name
+ "</font></b>:"
1604 this.attr_("labelsDiv").innerHTML
= replace
;
1607 // Draw colored circles over the center of each selected point
1609 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1610 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1612 this.attr_('highlightCircleSize', this.selPoints_
[i
].name
);
1614 ctx
.fillStyle
= this.plotter_
.colors
[this.selPoints_
[i
].name
];
1615 ctx
.arc(canvasx
, this.selPoints_
[i
].canvasy
, circleSize
,
1616 0, 2 * Math
.PI
, false);
1621 this.previousVerticalX_
= canvasx
;
1626 * Set manually set selected dots, and display information about them
1627 * @param int row number that should by highlighted
1628 * false value clears the selection
1631 Dygraph
.prototype.setSelection
= function(row
) {
1632 // Extract the points we've selected
1633 this.selPoints_
= [];
1636 if (row
!== false) {
1637 row
= row
-this.boundaryIds_
[0][0];
1640 if (row
!== false && row
>= 0) {
1641 for (var i
in this.layout_
.datasets
) {
1642 if (row
< this.layout_
.datasets
[i
].length
) {
1643 var point
= this.layout_
.points
[pos
+row
];
1645 if (this.attr_("stackedGraph")) {
1646 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1649 this.selPoints_
.push(point
);
1651 pos
+= this.layout_
.datasets
[i
].length
;
1655 if (this.selPoints_
.length
) {
1656 this.lastx_
= this.selPoints_
[0].xval
;
1657 this.updateSelection_();
1660 this.clearSelection();
1666 * The mouse has left the canvas. Clear out whatever artifacts remain
1667 * @param {Object} event the mouseout event from the browser.
1670 Dygraph
.prototype.mouseOut_
= function(event
) {
1671 if (this.attr_("unhighlightCallback")) {
1672 this.attr_("unhighlightCallback")(event
);
1675 if (this.attr_("hideOverlayOnMouseOut")) {
1676 this.clearSelection();
1681 * Remove all selection from the canvas
1684 Dygraph
.prototype.clearSelection
= function() {
1685 // Get rid of the overlay data
1686 var ctx
= this.canvas_
.getContext("2d");
1687 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1688 this.attr_("labelsDiv").innerHTML
= "";
1689 this.selPoints_
= [];
1694 * Returns the number of the currently selected row
1695 * @return int row number, of -1 if nothing is selected
1698 Dygraph
.prototype.getSelection
= function() {
1699 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1703 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1704 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1705 return row
+ this.boundaryIds_
[0][0];
1711 Dygraph
.zeropad
= function(x
) {
1712 if (x
< 10) return "0" + x
; else return "" + x
;
1716 * Return a string version of the hours, minutes and seconds portion of a date.
1717 * @param {Number} date The JavaScript date (ms since epoch)
1718 * @return {String} A time of the form "HH:MM:SS"
1721 Dygraph
.hmsString_
= function(date
) {
1722 var zeropad
= Dygraph
.zeropad
;
1723 var d
= new Date(date
);
1724 if (d
.getSeconds()) {
1725 return zeropad(d
.getHours()) + ":" +
1726 zeropad(d
.getMinutes()) + ":" +
1727 zeropad(d
.getSeconds());
1729 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
1734 * Convert a JS date to a string appropriate to display on an axis that
1735 * is displaying values at the stated granularity.
1736 * @param {Date} date The date to format
1737 * @param {Number} granularity One of the Dygraph granularity constants
1738 * @return {String} The formatted date
1741 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1742 if (granularity
>= Dygraph
.DECADAL
) {
1743 return date
.strftime('%Y');
1744 } else if (granularity
>= Dygraph
.MONTHLY
) {
1745 return date
.strftime('%b %y');
1747 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1748 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1749 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1751 return Dygraph
.hmsString_(date
.getTime());
1757 * Convert a JS date (millis since epoch) to YYYY/MM/DD
1758 * @param {Number} date The JavaScript date (ms since epoch)
1759 * @return {String} A date of the form "YYYY/MM/DD"
1762 Dygraph
.dateString_
= function(date
) {
1763 var zeropad
= Dygraph
.zeropad
;
1764 var d
= new Date(date
);
1767 var year
= "" + d
.getFullYear();
1768 // Get a 0 padded month string
1769 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
1770 // Get a 0 padded day string
1771 var day
= zeropad(d
.getDate());
1774 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1775 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
1777 return year
+ "/" + month + "/" + day
+ ret
;
1781 * Fires when there's data available to be graphed.
1782 * @param {String} data Raw CSV data to be plotted
1785 Dygraph
.prototype.loadedEvent_
= function(data
) {
1786 this.rawData_
= this.parseCSV_(data
);
1790 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1791 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1792 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1795 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1798 Dygraph
.prototype.addXTicks_
= function() {
1799 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1801 if (this.dateWindow_
) {
1802 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
1804 range
= [this.rawData_
[0][0], this.rawData_
[this.rawData_
.length
- 1][0]];
1807 var formatter
= this.attr_('xTicker');
1808 var ret
= formatter(range
[0], range
[1], this);
1811 if (ret
.ticks
!== undefined
) {
1812 // numericTicks() returns multiple values.
1814 this.numXDigits_
= ret
.numDigits
;
1819 this.layout_
.updateOptions({xTicks
: xTicks
});
1822 // Time granularity enumeration
1823 Dygraph
.SECONDLY
= 0;
1824 Dygraph
.TWO_SECONDLY
= 1;
1825 Dygraph
.FIVE_SECONDLY
= 2;
1826 Dygraph
.TEN_SECONDLY
= 3;
1827 Dygraph
.THIRTY_SECONDLY
= 4;
1828 Dygraph
.MINUTELY
= 5;
1829 Dygraph
.TWO_MINUTELY
= 6;
1830 Dygraph
.FIVE_MINUTELY
= 7;
1831 Dygraph
.TEN_MINUTELY
= 8;
1832 Dygraph
.THIRTY_MINUTELY
= 9;
1833 Dygraph
.HOURLY
= 10;
1834 Dygraph
.TWO_HOURLY
= 11;
1835 Dygraph
.SIX_HOURLY
= 12;
1837 Dygraph
.WEEKLY
= 14;
1838 Dygraph
.MONTHLY
= 15;
1839 Dygraph
.QUARTERLY
= 16;
1840 Dygraph
.BIANNUAL
= 17;
1841 Dygraph
.ANNUAL
= 18;
1842 Dygraph
.DECADAL
= 19;
1843 Dygraph
.CENTENNIAL
= 20;
1844 Dygraph
.NUM_GRANULARITIES
= 21;
1846 Dygraph
.SHORT_SPACINGS
= [];
1847 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1848 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1849 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1850 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1851 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1852 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1853 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1854 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1855 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1856 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1857 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1858 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1859 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1860 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1861 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1865 // If we used this time granularity, how many ticks would there be?
1866 // This is only an approximation, but it's generally good enough.
1868 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1869 if (granularity
< Dygraph
.MONTHLY
) {
1870 // Generate one tick mark for every fixed interval of time.
1871 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1872 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1874 var year_mod
= 1; // e.g. to only print one point every 10 years.
1875 var num_months
= 12;
1876 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1877 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1878 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1879 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1880 if (granularity
== Dygraph
.CENTENNIAL
) { num_months
= 1; year_mod
= 100; }
1882 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1883 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1884 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1890 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1891 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1893 // Returns an array containing {v: millis, label: label} dictionaries.
1895 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1896 var formatter
= this.attr_("xAxisLabelFormatter");
1898 if (granularity
< Dygraph
.MONTHLY
) {
1899 // Generate one tick mark for every fixed interval of time.
1900 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1901 var format
= '%d%b'; // e.g. "1Jan"
1903 // Find a time less than start_time which occurs on a "nice" time boundary
1904 // for this granularity.
1905 var g
= spacing
/ 1000;
1906 var d
= new Date(start_time
);
1907 if (g
<= 60) { // seconds
1908 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1912 if (g
<= 60) { // minutes
1913 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1918 if (g
<= 24) { // days
1919 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1924 if (g
== 7) { // one week
1925 d
.setDate(d
.getDate() - d
.getDay());
1930 start_time
= d
.getTime();
1932 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1933 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1936 // Display a tick mark on the first of a set of months of each year.
1937 // Years get a tick mark iff y % year_mod == 0. This is useful for
1938 // displaying a tick mark once every 10 years, say, on long time scales.
1940 var year_mod
= 1; // e.g. to only print one point every 10 years.
1942 if (granularity
== Dygraph
.MONTHLY
) {
1943 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1944 } else if (granularity
== Dygraph
.QUARTERLY
) {
1945 months
= [ 0, 3, 6, 9 ];
1946 } else if (granularity
== Dygraph
.BIANNUAL
) {
1948 } else if (granularity
== Dygraph
.ANNUAL
) {
1950 } else if (granularity
== Dygraph
.DECADAL
) {
1953 } else if (granularity
== Dygraph
.CENTENNIAL
) {
1957 this.warn("Span of dates is too long");
1960 var start_year
= new Date(start_time
).getFullYear();
1961 var end_year
= new Date(end_time
).getFullYear();
1962 var zeropad
= Dygraph
.zeropad
;
1963 for (var i
= start_year
; i
<= end_year
; i
++) {
1964 if (i
% year_mod
!= 0) continue;
1965 for (var j
= 0; j
< months
.length
; j
++) {
1966 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1967 var t
= Date
.parse(date_str
);
1968 if (t
< start_time
|| t
> end_time
) continue;
1969 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1979 * Add ticks to the x-axis based on a date range.
1980 * @param {Number} startDate Start of the date window (millis since epoch)
1981 * @param {Number} endDate End of the date window (millis since epoch)
1982 * @return {Array.<Object>} Array of {label, value} tuples.
1985 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1987 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1988 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1989 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1996 return self
.GetXAxis(startDate
, endDate
, chosen
);
1998 // TODO(danvk): signal error.
2002 // This is a list of human-friendly values at which to show tick marks on a log
2003 // scale. It is k * 10^n, where k=1..9 and n=-39..+39, so:
2004 // ..., 1, 2, 3, 4, 5, ..., 9, 10, 20, 30, ..., 90, 100, 200, 300, ...
2005 // NOTE: this assumes that Dygraph.LOG_SCALE = 10.
2006 Dygraph
.PREFERRED_LOG_TICK_VALUES
= function() {
2008 for (var power
= -39; power
<= 39; power
++) {
2009 var range
= Math
.pow(10, power
);
2010 for (var mult
= 1; mult
<= 9; mult
++) {
2011 var val
= range
* mult
;
2018 // val is the value to search for
2019 // arry is the value over which to search
2020 // if abs > 0, find the lowest entry greater than val
2021 // if abs < 0, find the highest entry less than val
2022 // if abs == 0, find the entry that equals val.
2023 // Currently does not work when val is outside the range of arry's values.
2024 Dygraph
.binarySearch
= function(val
, arry
, abs
, low
, high
) {
2025 if (low
== null || high
== null) {
2027 high
= arry
.length
- 1;
2035 var validIndex
= function(idx
) {
2036 return idx
>= 0 && idx
< arry
.length
;
2038 var mid
= parseInt((low
+ high
) / 2);
2039 var element
= arry
[mid
];
2040 if (element
== val
) {
2043 if (element
> val
) {
2045 // Accept if element > val, but also if prior element < val.
2047 if (validIndex(idx
) && arry
[idx
] < val
) {
2051 return Dygraph
.binarySearch(val
, arry
, abs
, low
, mid
- 1);
2053 if (element
< val
) {
2055 // Accept if element < val, but also if prior element > val.
2057 if (validIndex(idx
) && arry
[idx
] > val
) {
2061 return Dygraph
.binarySearch(val
, arry
, abs
, mid
+ 1, high
);
2066 * Determine the number of significant figures in a Number up to the specified
2067 * precision. Note that there is no way to determine if a trailing '0' is
2068 * significant or not, so by convention we return 1 for all of the following
2069 * inputs: 1, 1.0, 1.00, 1.000 etc.
2070 * @param {Number} x The input value.
2071 * @param {Number} opt_maxPrecision Optional maximum precision to consider.
2072 * Default and maximum allowed value is 13.
2073 * @return {Number} The number of significant figures which is >= 1.
2075 Dygraph
.significantFigures
= function(x
, opt_maxPrecision
) {
2076 var precision
= Math
.max(opt_maxPrecision
|| 13, 13);
2078 // Convert the number to its exponential notation form and work backwards,
2079 // ignoring the 'e+xx' bit. This may seem like a hack, but doing a loop and
2080 // dividing by 10 leads to roundoff errors. By using toExponential(), we let
2081 // the JavaScript interpreter handle the low level bits of the Number for us.
2082 var s
= x
.toExponential(precision
);
2083 var ePos
= s
.lastIndexOf('e'); // -1 case handled by return below.
2085 for (var i
= ePos
- 1; i
>= 0; i
--) {
2087 // Got to the decimal place. We'll call this 1 digit of precision because
2088 // we can't know for sure how many trailing 0s are significant.
2090 } else if (s
[i
] != '0') {
2091 // Found the first non-zero digit. Return the number of characters
2092 // except for the '.'.
2093 return i
; // This is i - 1 + 1 (-1 is for '.', +1 is for 0 based index).
2097 // Occurs if toExponential() doesn't return a string containing 'e', which
2098 // should never happen.
2103 * Add ticks when the x axis has numbers on it (instead of dates)
2104 * TODO(konigsberg): Update comment.
2106 * @param {Number} minV minimum value
2107 * @param {Number} maxV maximum value
2109 * @param {function} attribute accessor function.
2110 * @return {Array.<Object>} Array of {label, value} tuples.
2113 Dygraph
.numericTicks
= function(minV
, maxV
, self
, axis_props
, vals
) {
2114 var attr
= function(k
) {
2115 if (axis_props
&& axis_props
.hasOwnProperty(k
)) return axis_props
[k
];
2116 return self
.attr_(k
);
2121 for (var i
= 0; i
< vals
.length
; i
++) {
2122 ticks
.push({v
: vals
[i
]});
2125 if (axis_props
&& attr("logscale")) {
2126 var pixelsPerTick
= attr('pixelsPerYLabel');
2127 // NOTE(konigsberg): Dan, should self.height_ be self.plotter_.area.h?
2128 var nTicks
= Math
.floor(self
.height_
/ pixelsPerTick
);
2129 var minIdx
= Dygraph
.binarySearch(minV
, Dygraph
.PREFERRED_LOG_TICK_VALUES
, 1);
2130 var maxIdx
= Dygraph
.binarySearch(maxV
, Dygraph
.PREFERRED_LOG_TICK_VALUES
, -1);
2135 maxIdx
= Dygraph
.PREFERRED_LOG_TICK_VALUES
.length
- 1;
2137 // Count the number of tick values would appear, if we can get at least
2138 // nTicks / 4 accept them
.
2139 var lastDisplayed
= null;
2140 if (maxIdx
- minIdx
>= nTicks
/ 4) {
2141 var axisId
= axis_props
.yAxisId
;
2142 for (var idx
= maxIdx
; idx
>= minIdx
; idx
--) {
2143 var tickValue
= Dygraph
.PREFERRED_LOG_TICK_VALUES
[idx
];
2144 var domCoord
= axis_props
.g
.toDomYCoord(tickValue
, axisId
);
2145 var tick
= { v
: tickValue
};
2146 if (lastDisplayed
== null) {
2148 tickValue
: tickValue
,
2152 if (domCoord
- lastDisplayed
.domCoord
>= pixelsPerTick
) {
2154 tickValue
: tickValue
,
2163 // Since we went in backwards order.
2168 // ticks.length won't be 0 if the log scale function finds values to insert.
2169 if (ticks
.length
== 0) {
2171 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
2172 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
2173 // The first spacing greater than pixelsPerYLabel is what we use.
2174 // TODO(danvk): version that works on a log scale.
2175 if (attr("labelsKMG2")) {
2176 var mults
= [1, 2, 4, 8];
2178 var mults
= [1, 2, 5];
2180 var scale
, low_val
, high_val
, nTicks
;
2181 // TODO(danvk): make it possible to set this for x- and y-axes independently.
2182 var pixelsPerTick
= attr('pixelsPerYLabel');
2183 for (var i
= -10; i
< 50; i
++) {
2184 if (attr("labelsKMG2")) {
2185 var base_scale
= Math
.pow(16, i
);
2187 var base_scale
= Math
.pow(10, i
);
2189 for (var j
= 0; j
< mults
.length
; j
++) {
2190 scale
= base_scale
* mults
[j
];
2191 low_val
= Math
.floor(minV
/ scale
) * scale
;
2192 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
2193 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
2194 var spacing
= self
.height_
/ nTicks
;
2195 // wish I could break out of both loops at once...
2196 if (spacing
> pixelsPerTick
) break;
2198 if (spacing
> pixelsPerTick
) break;
2201 // Construct the set of ticks.
2202 // Allow reverse y-axis if it's explicitly requested.
2203 if (low_val
> high_val
) scale
*= -1;
2204 for (var i
= 0; i
< nTicks
; i
++) {
2205 var tickV
= low_val
+ i
* scale
;
2206 ticks
.push( {v
: tickV
} );
2211 // Add formatted labels to the ticks.
2214 if (attr("labelsKMB")) {
2216 k_labels
= [ "K", "M", "B", "T" ];
2218 if (attr("labelsKMG2")) {
2219 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
2221 k_labels
= [ "k", "M", "G", "T" ];
2223 var formatter
= attr('yAxisLabelFormatter') ?
2224 attr('yAxisLabelFormatter') : attr('yValueFormatter');
2226 // Determine the number of decimal places needed for the labels below by
2227 // taking the maximum number of significant figures for any label. We must
2228 // take the max because we can't tell if trailing 0s are significant.
2230 for (var i
= 0; i
< ticks
.length
; i
++) {
2231 numDigits
= Math
.max(Dygraph
.significantFigures(ticks
[i
].v
), numDigits
);
2234 // Add labels to the ticks.
2235 for (var i
= 0; i
< ticks
.length
; i
++) {
2236 if (ticks
[i
].label
!== undefined
) continue; // Use current label.
2237 var tickV
= ticks
[i
].v
;
2238 var absTickV
= Math
.abs(tickV
);
2239 var label
= (formatter
!== undefined
) ?
2240 formatter(tickV
, numDigits
) : tickV
.toPrecision(numDigits
);
2241 if (k_labels
.length
> 0) {
2242 // Round up to an appropriate unit.
2244 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
2245 if (absTickV
>= n
) {
2246 label
= formatter(tickV
/ n
, numDigits
) + k_labels
[j
];
2251 ticks
[i
].label
= label
;
2254 return {ticks
: ticks
, numDigits
: numDigits
};
2257 // Computes the range of the data series (including confidence intervals).
2258 // series is either [ [x1, y1], [x2, y2], ... ] or
2259 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2260 // Returns [low, high]
2261 Dygraph
.prototype.extremeValues_
= function(series
) {
2262 var minY
= null, maxY
= null;
2264 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2266 // With custom bars, maxY is the max of the high values.
2267 for (var j
= 0; j
< series
.length
; j
++) {
2268 var y
= series
[j
][1][0];
2270 var low
= y
- series
[j
][1][1];
2271 var high
= y
+ series
[j
][1][2];
2272 if (low
> y
) low
= y
; // this can happen with custom bars,
2273 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2274 if (maxY
== null || high
> maxY
) {
2277 if (minY
== null || low
< minY
) {
2282 for (var j
= 0; j
< series
.length
; j
++) {
2283 var y
= series
[j
][1];
2284 if (y
=== null || isNaN(y
)) continue;
2285 if (maxY
== null || y
> maxY
) {
2288 if (minY
== null || y
< minY
) {
2294 return [minY
, maxY
];
2298 * This function is called once when the chart's data is changed or the options
2299 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2300 * idea is that values derived from the chart's data can be computed here,
2301 * rather than every time the chart is drawn. This includes things like the
2302 * number of axes, rolling averages, etc.
2304 Dygraph
.prototype.predraw_
= function() {
2305 // TODO(danvk): move more computations out of drawGraph_ and into here.
2306 this.computeYAxes_();
2308 // Create a new plotter.
2309 if (this.plotter_
) this.plotter_
.clear();
2310 this.plotter_
= new DygraphCanvasRenderer(this,
2311 this.hidden_
, this.layout_
,
2312 this.renderOptions_
);
2314 // The roller sits in the bottom left corner of the chart. We don't know where
2315 // this will be until the options are available, so it's positioned here.
2316 this.createRollInterface_();
2318 // Same thing applies for the labelsDiv. It's right edge should be flush with
2319 // the right edge of the charting area (which may not be the same as the right
2320 // edge of the div, if we have two y-axes.
2321 this.positionLabelsDiv_();
2323 // If the data or options have changed, then we'd better redraw.
2328 * Update the graph with new data. This method is called when the viewing area
2329 * has changed. If the underlying data or options have changed, predraw_ will
2330 * be called before drawGraph_ is called.
2333 Dygraph
.prototype.drawGraph_
= function() {
2334 var data
= this.rawData_
;
2336 // This is used to set the second parameter to drawCallback, below.
2337 var is_initial_draw
= this.is_initial_draw_
;
2338 this.is_initial_draw_
= false;
2340 var minY
= null, maxY
= null;
2341 this.layout_
.removeAllDatasets();
2343 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
2345 // Loop over the fields (series). Go from the last to the first,
2346 // because if they're stacked that's how we accumulate the values.
2348 var cumulative_y
= []; // For stacked series.
2351 var extremes
= {}; // series name -> [low, high]
2353 // Loop over all fields and create datasets
2354 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
2355 if (!this.visibility()[i
- 1]) continue;
2357 var seriesName
= this.attr_("labels")[i
];
2358 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
2359 var logScale
= this.attr_('logscale', i
);
2362 for (var j
= 0; j
< data
.length
; j
++) {
2363 var date
= data
[j
][0];
2364 var point
= data
[j
][i
];
2366 // On the log scale, points less than zero do not exist.
2367 // This will create a gap in the chart. Note that this ignores
2368 // connectSeparatedPoints.
2372 series
.push([date
, point
]);
2374 if (point
!= null || !connectSeparatedPoints
) {
2375 series
.push([date
, point
]);
2380 // TODO(danvk): move this into predraw_. It's insane to do it here.
2381 series
= this.rollingAverage(series
, this.rollPeriod_
);
2383 // Prune down to the desired range, if necessary (for zooming)
2384 // Because there can be lines going to points outside of the visible area,
2385 // we actually prune to visible points, plus one on either side.
2386 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2387 if (this.dateWindow_
) {
2388 var low
= this.dateWindow_
[0];
2389 var high
= this.dateWindow_
[1];
2391 // TODO(danvk): do binary search instead of linear search.
2392 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2393 var firstIdx
= null, lastIdx
= null;
2394 for (var k
= 0; k
< series
.length
; k
++) {
2395 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2398 if (series
[k
][0] <= high
) {
2402 if (firstIdx
=== null) firstIdx
= 0;
2403 if (firstIdx
> 0) firstIdx
--;
2404 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2405 if (lastIdx
< series
.length
- 1) lastIdx
++;
2406 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
2407 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
2408 pruned
.push(series
[k
]);
2412 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
2415 var seriesExtremes
= this.extremeValues_(series
);
2418 for (var j
=0; j
<series
.length
; j
++) {
2419 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
2422 } else if (this.attr_("stackedGraph")) {
2423 var l
= series
.length
;
2425 for (var j
= 0; j
< l
; j
++) {
2426 // If one data set has a NaN, let all subsequent stacked
2427 // sets inherit the NaN -- only start at 0 for the first set.
2428 var x
= series
[j
][0];
2429 if (cumulative_y
[x
] === undefined
) {
2430 cumulative_y
[x
] = 0;
2433 actual_y
= series
[j
][1];
2434 cumulative_y
[x
] += actual_y
;
2436 series
[j
] = [x
, cumulative_y
[x
]]
2438 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2439 seriesExtremes
[1] = cumulative_y
[x
];
2441 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2442 seriesExtremes
[0] = cumulative_y
[x
];
2446 extremes
[seriesName
] = seriesExtremes
;
2448 datasets
[i
] = series
;
2451 for (var i
= 1; i
< datasets
.length
; i
++) {
2452 if (!this.visibility()[i
- 1]) continue;
2453 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
2456 this.computeYAxisRanges_(extremes
);
2457 this.layout_
.updateOptions( { yAxes
: this.axes_
,
2458 seriesToAxisMap
: this.seriesToAxisMap_
2463 // Tell PlotKit to use this new data and render itself
2464 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
2465 this.layout_
.evaluateWithError();
2466 this.plotter_
.clear();
2467 this.plotter_
.render();
2468 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2469 this.canvas_
.height
);
2471 if (this.attr_("drawCallback") !== null) {
2472 this.attr_("drawCallback")(this, is_initial_draw
);
2477 * Determine properties of the y-axes which are independent of the data
2478 * currently being displayed. This includes things like the number of axes and
2479 * the style of the axes. It does not include the range of each axis and its
2481 * This fills in this.axes_ and this.seriesToAxisMap_.
2482 * axes_ = [ { options } ]
2483 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2484 * indices are into the axes_ array.
2486 Dygraph
.prototype.computeYAxes_
= function() {
2487 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2488 this.seriesToAxisMap_
= {};
2490 // Get a list of series names.
2491 var labels
= this.attr_("labels");
2493 for (var i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2495 // all options which could be applied per-axis:
2503 'axisLabelFontSize',
2508 // Copy global axis options over to the first axis.
2509 for (var i
= 0; i
< axisOptions
.length
; i
++) {
2510 var k
= axisOptions
[i
];
2511 var v
= this.attr_(k
);
2512 if (v
) this.axes_
[0][k
] = v
;
2515 // Go through once and add all the axes.
2516 for (var seriesName
in series
) {
2517 if (!series
.hasOwnProperty(seriesName
)) continue;
2518 var axis
= this.attr_("axis", seriesName
);
2520 this.seriesToAxisMap_
[seriesName
] = 0;
2523 if (typeof(axis
) == 'object') {
2524 // Add a new axis, making a copy of its per-axis options.
2526 Dygraph
.update(opts
, this.axes_
[0]);
2527 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2528 var yAxisId
= this.axes_
.length
;
2529 opts
.yAxisId
= yAxisId
;
2531 Dygraph
.update(opts
, axis
);
2532 this.axes_
.push(opts
);
2533 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2537 // Go through one more time and assign series to an axis defined by another
2538 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2539 for (var seriesName
in series
) {
2540 if (!series
.hasOwnProperty(seriesName
)) continue;
2541 var axis
= this.attr_("axis", seriesName
);
2542 if (typeof(axis
) == 'string') {
2543 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2544 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2545 "series " + axis
+ ", which does not define its own axis.");
2548 var idx
= this.seriesToAxisMap_
[axis
];
2549 this.seriesToAxisMap_
[seriesName
] = idx
;
2553 // Now we remove series from seriesToAxisMap_ which are not visible. We do
2554 // this last so that hiding the first series doesn't destroy the axis
2555 // properties of the primary axis.
2556 var seriesToAxisFiltered
= {};
2557 var vis
= this.visibility();
2558 for (var i
= 1; i
< labels
.length
; i
++) {
2560 if (vis
[i
- 1]) seriesToAxisFiltered
[s
] = this.seriesToAxisMap_
[s
];
2562 this.seriesToAxisMap_
= seriesToAxisFiltered
;
2566 * Returns the number of y-axes on the chart.
2567 * @return {Number} the number of axes.
2569 Dygraph
.prototype.numAxes
= function() {
2571 for (var series
in this.seriesToAxisMap_
) {
2572 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2573 var idx
= this.seriesToAxisMap_
[series
];
2574 if (idx
> last_axis
) last_axis
= idx
;
2576 return 1 + last_axis
;
2580 * Determine the value range and tick marks for each axis.
2581 * @param {Object} extremes A mapping from seriesName -> [low, high]
2582 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2584 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2585 // Build a map from axis number -> [list of series names]
2586 var seriesForAxis
= [];
2587 for (var series
in this.seriesToAxisMap_
) {
2588 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2589 var idx
= this.seriesToAxisMap_
[series
];
2590 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2591 seriesForAxis
[idx
].push(series
);
2594 // Compute extreme values, a span and tick marks for each axis.
2595 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2596 var axis
= this.axes_
[i
];
2597 if (axis
.valueWindow
) {
2598 // This is only set if the user has zoomed on the y-axis. It is never set
2599 // by a user. It takes precedence over axis.valueRange because, if you set
2600 // valueRange, you'd still expect to be able to pan.
2601 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2602 } else if (axis
.valueRange
) {
2603 // This is a user-set value range for this axis.
2604 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2606 // Calculate the extremes of extremes.
2607 var series
= seriesForAxis
[i
];
2608 var minY
= Infinity
; // extremes[series[0]][0];
2609 var maxY
= -Infinity
; // extremes[series[0]][1];
2610 for (var j
= 0; j
< series
.length
; j
++) {
2611 minY
= Math
.min(extremes
[series
[j
]][0], minY
);
2612 maxY
= Math
.max(extremes
[series
[j
]][1], maxY
);
2614 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2616 // Add some padding and round up to an integer to be human-friendly.
2617 var span
= maxY
- minY
;
2618 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2619 if (span
== 0) { span
= maxY
; }
2623 if (axis
.logscale
) {
2624 var maxAxisY
= maxY
+ 0.1 * span
;
2625 var minAxisY
= minY
;
2627 var maxAxisY
= maxY
+ 0.1 * span
;
2628 var minAxisY
= minY
- 0.1 * span
;
2630 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2631 if (!this.attr_("avoidMinZero")) {
2632 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2633 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2636 if (this.attr_("includeZero")) {
2637 if (maxY
< 0) maxAxisY
= 0;
2638 if (minY
> 0) minAxisY
= 0;
2642 axis
.computedValueRange
= [minAxisY
, maxAxisY
];
2645 // Add ticks. By default, all axes inherit the tick positions of the
2646 // primary axis. However, if an axis is specifically marked as having
2647 // independent ticks, then that is permissible as well.
2648 if (i
== 0 || axis
.independentTicks
) {
2650 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2651 axis
.computedValueRange
[1],
2654 axis
.ticks
= ret
.ticks
;
2655 this.numYDigits_
= ret
.numDigits
;
2657 var p_axis
= this.axes_
[0];
2658 var p_ticks
= p_axis
.ticks
;
2659 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2660 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2661 var tick_values
= [];
2662 for (var i
= 0; i
< p_ticks
.length
; i
++) {
2663 var y_frac
= (p_ticks
[i
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2664 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2665 tick_values
.push(y_val
);
2669 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2670 axis
.computedValueRange
[1],
2671 this, axis
, tick_values
);
2672 axis
.ticks
= ret
.ticks
;
2673 this.numYDigits_
= ret
.numDigits
;
2679 * Calculates the rolling average of a data set.
2680 * If originalData is [label, val], rolls the average of those.
2681 * If originalData is [label, [, it's interpreted as [value, stddev]
2682 * and the roll is returned in the same form, with appropriately reduced
2683 * stddev for each value.
2684 * Note that this is where fractional input (i.e. '5/10') is converted into
2686 * @param {Array} originalData The data in the appropriate format (see above)
2687 * @param {Number} rollPeriod The number of points over which to average the
2690 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2691 if (originalData
.length
< 2)
2692 return originalData
;
2693 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
2694 var rollingData
= [];
2695 var sigma
= this.attr_("sigma");
2697 if (this.fractions_
) {
2699 var den
= 0; // numerator/denominator
2701 for (var i
= 0; i
< originalData
.length
; i
++) {
2702 num
+= originalData
[i
][1][0];
2703 den
+= originalData
[i
][1][1];
2704 if (i
- rollPeriod
>= 0) {
2705 num
-= originalData
[i
- rollPeriod
][1][0];
2706 den
-= originalData
[i
- rollPeriod
][1][1];
2709 var date
= originalData
[i
][0];
2710 var value
= den
? num
/ den
: 0.0;
2711 if (this.attr_("errorBars")) {
2712 if (this.wilsonInterval_
) {
2713 // For more details on this confidence interval, see:
2714 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2716 var p
= value
< 0 ? 0 : value
, n
= den
;
2717 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2718 var denom
= 1 + sigma
* sigma
/ den
;
2719 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2720 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2721 rollingData
[i
] = [date
,
2722 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2724 rollingData
[i
] = [date
, [0, 0, 0]];
2727 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2728 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2731 rollingData
[i
] = [date
, mult
* value
];
2734 } else if (this.attr_("customBars")) {
2739 for (var i
= 0; i
< originalData
.length
; i
++) {
2740 var data
= originalData
[i
][1];
2742 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2744 if (y
!= null && !isNaN(y
)) {
2750 if (i
- rollPeriod
>= 0) {
2751 var prev
= originalData
[i
- rollPeriod
];
2752 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
2759 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2760 1.0 * (mid
- low
) / count
,
2761 1.0 * (high
- mid
) / count
]];
2764 // Calculate the rolling average for the first rollPeriod - 1 points where
2765 // there is not enough data to roll over the full number of points
2766 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
2767 if (!this.attr_("errorBars")){
2768 if (rollPeriod
== 1) {
2769 return originalData
;
2772 for (var i
= 0; i
< originalData
.length
; i
++) {
2775 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2776 var y
= originalData
[j
][1];
2777 if (y
== null || isNaN(y
)) continue;
2779 sum
+= originalData
[j
][1];
2782 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2784 rollingData
[i
] = [originalData
[i
][0], null];
2789 for (var i
= 0; i
< originalData
.length
; i
++) {
2793 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2794 var y
= originalData
[j
][1][0];
2795 if (y
== null || isNaN(y
)) continue;
2797 sum
+= originalData
[j
][1][0];
2798 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2801 var stddev
= Math
.sqrt(variance
) / num_ok
;
2802 rollingData
[i
] = [originalData
[i
][0],
2803 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2805 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2815 * Parses a date, returning the number of milliseconds since epoch. This can be
2816 * passed in as an xValueParser in the Dygraph constructor.
2817 * TODO(danvk): enumerate formats that this understands.
2818 * @param {String} A date in YYYYMMDD format.
2819 * @return {Number} Milliseconds since epoch.
2822 Dygraph
.dateParser
= function(dateStr
, self
) {
2825 if (dateStr
.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12'
2826 dateStrSlashed
= dateStr
.replace("-", "/", "g");
2827 while (dateStrSlashed
.search("-") != -1) {
2828 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
2830 d
= Date
.parse(dateStrSlashed
);
2831 } else if (dateStr
.length
== 8) { // e.g. '20090712'
2832 // TODO(danvk): remove support for this format. It's confusing.
2833 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
2834 + "/" + dateStr
.substr(6,2);
2835 d
= Date
.parse(dateStrSlashed
);
2837 // Any format that Date.parse will accept, e.g. "2009/07/12" or
2838 // "2009/07/12 12:34:56"
2839 d
= Date
.parse(dateStr
);
2842 if (!d
|| isNaN(d
)) {
2843 self
.error("Couldn't parse " + dateStr
+ " as a date");
2849 * Detects the type of the str (date or numeric) and sets the various
2850 * formatting attributes in this.attrs_ based on this type.
2851 * @param {String} str An x value.
2854 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2856 if (str
.indexOf('-') > 0 ||
2857 str
.indexOf('/') >= 0 ||
2858 isNaN(parseFloat(str
))) {
2860 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2861 // TODO(danvk): remove support for this format.
2866 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2867 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2868 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2869 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2871 this.attrs_
.xValueFormatter
= this.attrs_
.xValueFormatter
;
2872 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2873 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2874 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2879 * Parses a string in a special csv format. We expect a csv file where each
2880 * line is a date point, and the first field in each line is the date string.
2881 * We also expect that all remaining fields represent series.
2882 * if the errorBars attribute is set, then interpret the fields as:
2883 * date, series1, stddev1, series2, stddev2, ...
2884 * @param {Array.<Object>} data See above.
2887 * @return Array.<Object> An array with one entry for each row. These entries
2888 * are an array of cells in that row. The first entry is the parsed x-value for
2889 * the row. The second, third, etc. are the y-values. These can take on one of
2890 * three forms, depending on the CSV and constructor parameters:
2892 * 2. [ value, stddev ]
2893 * 3. [ low value, center value, high value ]
2895 Dygraph
.prototype.parseCSV_
= function(data
) {
2897 var lines
= data
.split("\n");
2899 // Use the default delimiter or fall back to a tab if that makes sense.
2900 var delim
= this.attr_('delimiter');
2901 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2906 if (this.labelsFromCSV_
) {
2908 this.attrs_
.labels
= lines
[0].split(delim
);
2911 // Parse the x as a float or return null if it's not a number.
2912 var parseFloatOrNull
= function(x
) {
2913 var val
= parseFloat(x
);
2914 // isFinite() returns false for NaN and +/-Infinity
.
2915 return isFinite(val
) ? val
: null;
2919 var defaultParserSet
= false; // attempt to auto-detect x value type
2920 var expectedCols
= this.attr_("labels").length
;
2921 var outOfOrder
= false;
2922 for (var i
= start
; i
< lines
.length
; i
++) {
2923 var line
= lines
[i
];
2924 if (line
.length
== 0) continue; // skip blank lines
2925 if (line
[0] == '#') continue; // skip comment lines
2926 var inFields
= line
.split(delim
);
2927 if (inFields
.length
< 2) continue;
2930 if (!defaultParserSet
) {
2931 this.detectTypeFromString_(inFields
[0]);
2932 xParser
= this.attr_("xValueParser");
2933 defaultParserSet
= true;
2935 fields
[0] = xParser(inFields
[0], this);
2937 // If fractions are expected, parse the numbers as "A/B
"
2938 if (this.fractions_) {
2939 for (var j = 1; j < inFields.length; j++) {
2940 // TODO(danvk): figure out an appropriate way to flag parse errors.
2941 var vals = inFields[j].split("/");
2942 fields[j] = [parseFloatOrNull(vals[0]), parseFloatOrNull(vals[1])];
2944 } else if (this.attr_("errorBars
")) {
2945 // If there are error bars, values are (value, stddev) pairs
2946 for (var j = 1; j < inFields.length; j += 2)
2947 fields[(j + 1) / 2] = [parseFloatOrNull(inFields[j]),
2948 parseFloatOrNull(inFields[j + 1])];
2949 } else if (this.attr_("customBars
")) {
2950 // Bars are a low;center;high tuple
2951 for (var j = 1; j < inFields.length; j++) {
2952 var vals = inFields[j].split(";");
2953 fields[j] = [ parseFloatOrNull(vals[0]),
2954 parseFloatOrNull(vals[1]),
2955 parseFloatOrNull(vals[2]) ];
2958 // Values are just numbers
2959 for (var j = 1; j < inFields.length; j++) {
2960 fields[j] = parseFloatOrNull(inFields[j]);
2963 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2968 if (fields.length != expectedCols) {
2969 this.error("Number of columns
in line
" + i + " (" + fields.length +
2970 ") does not agree
with number of
labels (" + expectedCols +
2976 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2977 ret.sort(function(a,b) { return a[0] - b[0] });
2984 * The user has provided their data as a pre-packaged JS array. If the x values
2985 * are numeric, this is the same as dygraphs' internal format. If the x values
2986 * are dates, we need to convert them from Date objects to ms since epoch.
2987 * @param {Array.<Object>} data
2988 * @return {Array.<Object>} data with numeric x values.
2990 Dygraph.prototype.parseArray_ = function(data) {
2991 // Peek at the first x value to see if it's numeric.
2992 if (data.length == 0) {
2993 this.error("Can
't plot empty data set");
2996 if (data[0].length == 0) {
2997 this.error("Data set cannot contain an empty row");
3001 if (this.attr_("labels") == null) {
3002 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3003 "in the options parameter");
3004 this.attrs_.labels = [ "X" ];
3005 for (var i = 1; i < data[0].length; i++) {
3006 this.attrs_.labels.push("Y" + i);
3010 if (Dygraph.isDateLike(data[0][0])) {
3011 // Some intelligent defaults for a date x-axis.
3012 this.attrs_.xValueFormatter = Dygraph.dateString_;
3013 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
3014 this.attrs_.xTicker = Dygraph.dateTicker;
3016 // Assume they're all dates
.
3017 var parsedData
= Dygraph
.clone(data
);
3018 for (var i
= 0; i
< data
.length
; i
++) {
3019 if (parsedData
[i
].length
== 0) {
3020 this.error("Row " + (1 + i
) + " of data is empty");
3023 if (parsedData
[i
][0] == null
3024 || typeof(parsedData
[i
][0].getTime
) != 'function'
3025 || isNaN(parsedData
[i
][0].getTime())) {
3026 this.error("x value in row " + (1 + i
) + " is not a Date");
3029 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3033 // Some intelligent defaults for a numeric x-axis.
3034 this.attrs_
.xValueFormatter
= this.attrs_
.yValueFormatter
;
3035 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
3041 * Parses a DataTable object from gviz.
3042 * The data is expected to have a first column that is either a date or a
3043 * number. All subsequent columns must be numbers. If there is a clear mismatch
3044 * between this.xValueParser_ and the type of the first column, it will be
3045 * fixed. Fills out rawData_.
3046 * @param {Array.<Object>} data See above.
3049 Dygraph
.prototype.parseDataTable_
= function(data
) {
3050 var cols
= data
.getNumberOfColumns();
3051 var rows
= data
.getNumberOfRows();
3053 var indepType
= data
.getColumnType(0);
3054 if (indepType
== 'date' || indepType
== 'datetime') {
3055 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
3056 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3057 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
3058 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3059 } else if (indepType
== 'number') {
3060 this.attrs_
.xValueFormatter
= this.attrs_
.yValueFormatter
;
3061 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3062 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
3063 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
3065 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3066 "column 1 of DataTable input (Got '" + indepType
+ "')");
3070 // Array of the column indices which contain data (and not annotations).
3072 var annotationCols
= {}; // data index -> [annotation cols]
3073 var hasAnnotations
= false;
3074 for (var i
= 1; i
< cols
; i
++) {
3075 var type
= data
.getColumnType(i
);
3076 if (type
== 'number') {
3078 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3079 // This is OK -- it's an annotation column.
3080 var dataIdx
= colIdx
[colIdx
.length
- 1];
3081 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3082 annotationCols
[dataIdx
] = [i
];
3084 annotationCols
[dataIdx
].push(i
);
3086 hasAnnotations
= true;
3088 this.error("Only 'number' is supported as a dependent type with Gviz." +
3089 " 'string' is only supported if displayAnnotations is true");
3093 // Read column labels
3094 // TODO(danvk): add support back for errorBars
3095 var labels
= [data
.getColumnLabel(0)];
3096 for (var i
= 0; i
< colIdx
.length
; i
++) {
3097 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3098 if (this.attr_("errorBars")) i
+= 1;
3100 this.attrs_
.labels
= labels
;
3101 cols
= labels
.length
;
3104 var outOfOrder
= false;
3105 var annotations
= [];
3106 for (var i
= 0; i
< rows
; i
++) {
3108 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3109 data
.getValue(i
, 0) === null) {
3110 this.warn("Ignoring row " + i
+
3111 " of DataTable because of undefined or null first column.");
3115 if (indepType
== 'date' || indepType
== 'datetime') {
3116 row
.push(data
.getValue(i
, 0).getTime());
3118 row
.push(data
.getValue(i
, 0));
3120 if (!this.attr_("errorBars")) {
3121 for (var j
= 0; j
< colIdx
.length
; j
++) {
3122 var col
= colIdx
[j
];
3123 row
.push(data
.getValue(i
, col
));
3124 if (hasAnnotations
&&
3125 annotationCols
.hasOwnProperty(col
) &&
3126 data
.getValue(i
, annotationCols
[col
][0]) != null) {
3128 ann
.series
= data
.getColumnLabel(col
);
3130 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
3132 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3133 if (k
) ann
.text
+= "\n";
3134 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3136 annotations
.push(ann
);
3140 for (var j
= 0; j
< cols
- 1; j
++) {
3141 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3144 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3148 // Strip out infinities, which give dygraphs problems later on.
3149 for (var j
= 0; j
< row
.length
; j
++) {
3150 if (!isFinite(row
[j
])) row
[j
] = null;
3156 this.warn("DataTable is out of order; order it correctly to speed loading.");
3157 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
3159 this.rawData_
= ret
;
3161 if (annotations
.length
> 0) {
3162 this.setAnnotations(annotations
, true);
3166 // These functions are all based on MochiKit.
3167 Dygraph
.update
= function (self
, o
) {
3168 if (typeof(o
) != 'undefined' && o
!== null) {
3170 if (o
.hasOwnProperty(k
)) {
3178 Dygraph
.isArrayLike
= function (o
) {
3179 var typ
= typeof(o
);
3181 (typ
!= 'object' && !(typ
== 'function' &&
3182 typeof(o
.item
) == 'function')) ||
3184 typeof(o
.length
) != 'number' ||
3192 Dygraph
.isDateLike
= function (o
) {
3193 if (typeof(o
) != "object" || o
=== null ||
3194 typeof(o
.getTime
) != 'function') {
3200 Dygraph
.clone
= function(o
) {
3201 // TODO(danvk): figure out how MochiKit's version works
3203 for (var i
= 0; i
< o
.length
; i
++) {
3204 if (Dygraph
.isArrayLike(o
[i
])) {
3205 r
.push(Dygraph
.clone(o
[i
]));
3215 * Get the CSV data. If it's in a function, call that function. If it's in a
3216 * file, do an XMLHttpRequest to get it.
3219 Dygraph
.prototype.start_
= function() {
3220 if (typeof this.file_
== 'function') {
3221 // CSV string. Pretend we got it via XHR.
3222 this.loadedEvent_(this.file_());
3223 } else if (Dygraph
.isArrayLike(this.file_
)) {
3224 this.rawData_
= this.parseArray_(this.file_
);
3226 } else if (typeof this.file_
== 'object' &&
3227 typeof this.file_
.getColumnRange
== 'function') {
3228 // must be a DataTable from gviz.
3229 this.parseDataTable_(this.file_
);
3231 } else if (typeof this.file_
== 'string') {
3232 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3233 if (this.file_
.indexOf('\n') >= 0) {
3234 this.loadedEvent_(this.file_
);
3236 var req
= new XMLHttpRequest();
3238 req
.onreadystatechange
= function () {
3239 if (req
.readyState
== 4) {
3240 if (req
.status
== 200) {
3241 caller
.loadedEvent_(req
.responseText
);
3246 req
.open("GET", this.file_
, true);
3250 this.error("Unknown data format: " + (typeof this.file_
));
3255 * Changes various properties of the graph. These can include:
3257 * <li>file: changes the source data for the graph</li>
3258 * <li>errorBars: changes whether the data contains stddev</li>
3260 * @param {Object} attrs The new properties and values
3262 Dygraph
.prototype.updateOptions
= function(attrs
) {
3263 // TODO(danvk): this is a mess. Rethink this function.
3264 if ('rollPeriod' in attrs
) {
3265 this.rollPeriod_
= attrs
.rollPeriod
;
3267 if ('dateWindow' in attrs
) {
3268 this.dateWindow_
= attrs
.dateWindow
;
3271 // TODO(danvk): validate per-series options.
3276 // highlightCircleSize
3278 Dygraph
.update(this.user_attrs_
, attrs
);
3279 Dygraph
.update(this.renderOptions_
, attrs
);
3281 this.labelsFromCSV_
= (this.attr_("labels") == null);
3283 // TODO(danvk): this doesn't match the constructor logic
3284 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
3285 if (attrs
['file']) {
3286 this.file_
= attrs
['file'];
3294 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3295 * containing div (which has presumably changed size since the dygraph was
3296 * instantiated. If the width/height are specified, the div will be resized.
3298 * This is far more efficient than destroying and re-instantiating a
3299 * Dygraph, since it doesn't have to reparse the underlying data.
3301 * @param {Number} width Width (in pixels)
3302 * @param {Number} height Height (in pixels)
3304 Dygraph
.prototype.resize
= function(width
, height
) {
3305 if (this.resize_lock
) {
3308 this.resize_lock
= true;
3310 if ((width
=== null) != (height
=== null)) {
3311 this.warn("Dygraph.resize() should be called with zero parameters or " +
3312 "two non-NULL parameters. Pretending it was zero.");
3313 width
= height
= null;
3316 // TODO(danvk): there should be a clear() method.
3317 this.maindiv_
.innerHTML
= "";
3318 this.attrs_
.labelsDiv
= null;
3321 this.maindiv_
.style
.width
= width
+ "px";
3322 this.maindiv_
.style
.height
= height
+ "px";
3323 this.width_
= width
;
3324 this.height_
= height
;
3326 this.width_
= this.maindiv_
.offsetWidth
;
3327 this.height_
= this.maindiv_
.offsetHeight
;
3330 this.createInterface_();
3333 this.resize_lock
= false;
3337 * Adjusts the number of points in the rolling average. Updates the graph to
3338 * reflect the new averaging period.
3339 * @param {Number} length Number of points over which to average the data.
3341 Dygraph
.prototype.adjustRoll
= function(length
) {
3342 this.rollPeriod_
= length
;
3347 * Returns a boolean array of visibility statuses.
3349 Dygraph
.prototype.visibility
= function() {
3350 // Do lazy-initialization, so that this happens after we know the number of
3352 if (!this.attr_("visibility")) {
3353 this.attrs_
["visibility"] = [];
3355 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
3356 this.attr_("visibility").push(true);
3358 return this.attr_("visibility");
3362 * Changes the visiblity of a series.
3364 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3365 var x
= this.visibility();
3366 if (num
< 0 || num
>= x
.length
) {
3367 this.warn("invalid series number in setVisibility: " + num
);
3375 * Update the list of annotations and redraw the chart.
3377 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3378 // Only add the annotation CSS rule once we know it will be used.
3379 Dygraph
.addAnnotationRule();
3380 this.annotations_
= ann
;
3381 this.layout_
.setAnnotations(this.annotations_
);
3382 if (!suppressDraw
) {
3388 * Return the list of annotations.
3390 Dygraph
.prototype.annotations
= function() {
3391 return this.annotations_
;
3395 * Get the index of a series (column) given its name. The first column is the
3396 * x-axis, so the data series start with index 1.
3398 Dygraph
.prototype.indexFromSetName
= function(name
) {
3399 var labels
= this.attr_("labels");
3400 for (var i
= 0; i
< labels
.length
; i
++) {
3401 if (labels
[i
] == name
) return i
;
3406 Dygraph
.addAnnotationRule
= function() {
3407 if (Dygraph
.addedAnnotationCSS
) return;
3409 var rule
= "border: 1px solid black; " +
3410 "background-color: white; " +
3411 "text-align: center;";
3413 var styleSheetElement
= document
.createElement("style");
3414 styleSheetElement
.type
= "text/css";
3415 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3417 // Find the first style sheet that we can access.
3418 // We may not add a rule to a style sheet from another domain for security
3419 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3420 // adds its own style sheets from google.com.
3421 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3422 if (document
.styleSheets
[i
].disabled
) continue;
3423 var mysheet
= document
.styleSheets
[i
];
3425 if (mysheet
.insertRule
) { // Firefox
3426 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3427 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3428 } else if (mysheet
.addRule
) { // IE
3429 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3431 Dygraph
.addedAnnotationCSS
= true;
3434 // Was likely a security exception.
3438 this.warn("Unable to add default annotation CSS rule; display may be off.");
3442 * Create a new canvas element. This is more complex than a simple
3443 * document.createElement("canvas") because of IE and excanvas.
3445 Dygraph
.createCanvas
= function() {
3446 var canvas
= document
.createElement("canvas");
3448 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
3449 if (isIE
&& (typeof(G_vmlCanvasManager
) != 'undefined')) {
3450 canvas
= G_vmlCanvasManager
.initElement(canvas
);
3458 * A wrapper around Dygraph that implements the gviz API.
3459 * @param {Object} container The DOM object the visualization should live in.
3461 Dygraph
.GVizChart
= function(container
) {
3462 this.container
= container
;
3465 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
3466 // Clear out any existing dygraph.
3467 // TODO(danvk): would it make more sense to simply redraw using the current
3468 // date_graph object?
3469 this.container
.innerHTML
= '';
3470 if (typeof(this.date_graph
) != 'undefined') {
3471 this.date_graph
.destroy();
3474 this.date_graph
= new Dygraph(this.container
, data
, options
);
3478 * Google charts compatible setSelection
3479 * Only row selection is supported, all points in the row will be highlighted
3480 * @param {Array} array of the selected cells
3483 Dygraph
.GVizChart
.prototype.setSelection
= function(selection_array
) {
3485 if (selection_array
.length
) {
3486 row
= selection_array
[0].row
;
3488 this.date_graph
.setSelection(row
);
3492 * Google charts compatible getSelection implementation
3493 * @return {Array} array of the selected cells
3496 Dygraph
.GVizChart
.prototype.getSelection
= function() {
3499 var row
= this.date_graph
.getSelection();
3501 if (row
< 0) return selection
;
3504 for (var i
in this.date_graph
.layout_
.datasets
) {
3505 selection
.push({row
: row
, column
: col
});
3512 // Older pages may still use this name.
3513 DateGraph
= Dygraph
;