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
28 Date,SeriesA,SeriesB,...
29 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
30 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
32 If the 'fractions' option is set, the input should be of the form:
34 Date,SeriesA,SeriesB,...
35 YYYYMMDD,A1/B1,A2/B2,...
36 YYYYMMDD,A1/B1,A2/B2,...
38 And error bars will be calculated automatically using a binomial distribution.
40 For further documentation and examples, see http://dygraphs.com/
45 * An interactive, zoomable graph
46 * @param {String | Function} file A file containing CSV data or a function that
47 * returns this data. The expected format for each line is
48 * YYYYMMDD,val1,val2,... or, if attrs.errorBars is set,
49 * YYYYMMDD,val1,stddev1,val2,stddev2,...
50 * @param {Object} attrs Various other attributes, e.g. errorBars determines
51 * whether the input data contains error ranges.
53 Dygraph
= function(div
, data
, opts
) {
54 if (arguments
.length
> 0) {
55 if (arguments
.length
== 4) {
56 // Old versions of dygraphs took in the series labels as a constructor
57 // parameter. This doesn't make sense anymore, but it's easy to continue
58 // to support this usage.
59 this.warn("Using deprecated four-argument dygraph constructor");
60 this.__old_init__(div
, data
, arguments
[2], arguments
[3]);
62 this.__init__(div
, data
, opts
);
67 Dygraph
.NAME
= "Dygraph";
68 Dygraph
.VERSION
= "1.2";
69 Dygraph
.__repr__
= function() {
70 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
72 Dygraph
.toString
= function() {
73 return this.__repr__();
77 * Number formatting function which mimicks the behavior of %g in printf, i.e.
78 * either exponential or fixed format (without trailing 0s) is used depending on
79 * the length of the generated string. The advantage of this format is that
80 * there is a predictable upper bound on the resulting string length and
81 * significant figures are not dropped.
83 * NOTE: JavaScript's native toPrecision() is NOT a drop-in replacement for %g.
84 * It creates strings which are too long for absolute values between 10^-4 and
85 * 10^-6. See tests/number-format.html for examples.
87 * @param {Number} x The number to format
88 * @param {Number} opt_precision The precision to use, default 2.
89 * @return {String} A string formatted like %g in printf. The max generated
90 * string length should be precision +
92 Dygraph
.defaultFormat
= function(x
, opt_precision
) {
93 // Avoid invalid precision values; [1, 21] is the valid range.
94 var p
= Math
.min(Math
.max(1, opt_precision
|| 2), 21);
96 // This is deceptively simple. The actual algorithm comes from:
98 // Max allowed length = p + 4
99 // where 4 comes from 'e+n' and '.'.
101 // Length of fixed format = 2 + y + p
102 // where 2 comes from '0.' and y = # of leading zeroes.
104 // Equating the two and solving for y yields y = 2, or 0.00xxxx which is
107 // Since the behavior of toPrecision() is identical for larger numbers, we
108 // don't have to worry about the other bound.
110 // Finally, the argument for toExponential() is the number of trailing digits,
111 // so we take off 1 for the value before the '.'.
112 return (Math
.abs(x
) < 1.0e-3 && x
!= 0.0) ?
113 x
.toExponential(p
- 1) : x
.toPrecision(p
);
116 // Various default values
117 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
118 Dygraph
.DEFAULT_WIDTH
= 480;
119 Dygraph
.DEFAULT_HEIGHT
= 320;
120 Dygraph
.AXIS_LINE_WIDTH
= 0.3;
123 // Default attribute values.
124 Dygraph
.DEFAULT_ATTRS
= {
125 highlightCircleSize
: 3,
131 // TODO(danvk): move defaults from createStatusMessage_ here.
133 labelsSeparateLines
: false,
134 labelsShowZeroValues
: true,
137 showLabelsOnHighlight
: true,
139 yValueFormatter
: Dygraph
.defaultFormat
,
144 axisLabelFontSize
: 14,
147 xAxisLabelFormatter
: Dygraph
.dateAxisFormatter
,
151 xValueFormatter
: Dygraph
.dateString_
,
152 xValueParser
: Dygraph
.dateParser
,
153 xTicker
: Dygraph
.dateTicker
,
161 wilsonInterval
: true, // only relevant if fractions is true
165 connectSeparatedPoints
: false,
168 hideOverlayOnMouseOut
: true,
173 interactionModel
: null // will be set to Dygraph.defaultInteractionModel.
176 // Various logging levels.
182 // Directions for panning and zooming. Use bit operations when combined
183 // values are possible.
184 Dygraph
.HORIZONTAL
= 1;
185 Dygraph
.VERTICAL
= 2;
187 // Used for initializing annotation CSS rules only once.
188 Dygraph
.addedAnnotationCSS
= false;
190 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
191 // Labels is no longer a constructor parameter, since it's typically set
192 // directly from the data source. It also conains a name for the x-axis,
193 // which the previous constructor form did not.
194 if (labels
!= null) {
195 var new_labels
= ["Date"];
196 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
197 Dygraph
.update(attrs
, { 'labels': new_labels
});
199 this.__init__(div
, file
, attrs
);
203 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
204 * and context <canvas> inside of it. See the constructor for details.
206 * @param {Element} div the Element to render the graph into.
207 * @param {String | Function} file Source data
208 * @param {Object} attrs Miscellaneous other options
211 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
212 // Hack for IE: if we're using excanvas and the document hasn't finished
213 // loading yet (and hence may not have initialized whatever it needs to
214 // initialize), then keep calling this routine periodically until it has.
215 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
216 typeof(G_vmlCanvasManager
) != 'undefined' &&
217 document
.readyState
!= 'complete') {
219 setTimeout(function() { self
.__init__(div
, file
, attrs
) }, 100);
222 // Support two-argument constructor
223 if (attrs
== null) { attrs
= {}; }
225 // Copy the important bits into the object
226 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
229 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
230 this.previousVerticalX_
= -1;
231 this.fractions_
= attrs
.fractions
|| false;
232 this.dateWindow_
= attrs
.dateWindow
|| null;
234 this.wilsonInterval_
= attrs
.wilsonInterval
|| true;
235 this.is_initial_draw_
= true;
236 this.annotations_
= [];
238 // Number of digits to use when labeling the x (if numeric) and y axis
240 this.numXDigits_
= 2;
241 this.numYDigits_
= 2;
243 // When labeling x (if numeric) or y values in the legend, there are
244 // numDigits + numExtraDigits of precision used. For axes labels with N
245 // digits of precision, the data should be displayed with at least N+1 digits
246 // of precision. The reason for this is to divide each interval between
247 // successive ticks into tenths (for 1) or hundredths (for 2), etc. For
248 // example, if the labels are [0, 1, 2], we want data to be displayed as
250 this.numExtraDigits_
= 1;
252 // Clear the div. This ensure that, if multiple dygraphs are passed the same
253 // div, then only one will be drawn.
256 // If the div isn't already sized then inherit from our attrs or
257 // give it a default size.
258 if (div
.style
.width
== '') {
259 div
.style
.width
= (attrs
.width
|| Dygraph
.DEFAULT_WIDTH
) + "px";
261 if (div
.style
.height
== '') {
262 div
.style
.height
= (attrs
.height
|| Dygraph
.DEFAULT_HEIGHT
) + "px";
264 this.width_
= parseInt(div
.style
.width
, 10);
265 this.height_
= parseInt(div
.style
.height
, 10);
266 // The div might have been specified as percent of the current window size,
267 // convert that to an appropriate number of pixels.
268 if (div
.style
.width
.indexOf("%") == div
.style
.width
.length
- 1) {
269 this.width_
= div
.offsetWidth
;
271 if (div
.style
.height
.indexOf("%") == div
.style
.height
.length
- 1) {
272 this.height_
= div
.offsetHeight
;
275 if (this.width_
== 0) {
276 this.error("dygraph has zero width. Please specify a width in pixels.");
278 if (this.height_
== 0) {
279 this.error("dygraph has zero height. Please specify a height in pixels.");
282 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
283 if (attrs
['stackedGraph']) {
284 attrs
['fillGraph'] = true;
285 // TODO(nikhilk): Add any other stackedGraph checks here.
288 // Dygraphs has many options, some of which interact with one another.
289 // To keep track of everything, we maintain two sets of options:
291 // this.user_attrs_ only options explicitly set by the user.
292 // this.attrs_ defaults, options derived from user_attrs_, data.
294 // Options are then accessed this.attr_('attr'), which first looks at
295 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
296 // defaults without overriding behavior that the user specifically asks for.
297 this.user_attrs_
= {};
298 Dygraph
.update(this.user_attrs_
, attrs
);
301 Dygraph
.update(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
303 this.boundaryIds_
= [];
305 // Make a note of whether labels will be pulled from the CSV file.
306 this.labelsFromCSV_
= (this.attr_("labels") == null);
308 // Create the containing DIV and other interactive elements
309 this.createInterface_();
314 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
316 typeof(this.user_attrs_
[seriesName
]) != 'undefined' &&
317 this.user_attrs_
[seriesName
] != null &&
318 typeof(this.user_attrs_
[seriesName
][name
]) != 'undefined') {
319 return this.user_attrs_
[seriesName
][name
];
320 } else if (typeof(this.user_attrs_
[name
]) != 'undefined') {
321 return this.user_attrs_
[name
];
322 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
323 return this.attrs_
[name
];
329 // TODO(danvk): any way I can get the line numbers to be this.warn call?
330 Dygraph
.prototype.log
= function(severity
, message
) {
331 if (typeof(console
) != 'undefined') {
334 console
.debug('dygraphs: ' + message
);
337 console
.info('dygraphs: ' + message
);
339 case Dygraph
.WARNING
:
340 console
.warn('dygraphs: ' + message
);
343 console
.error('dygraphs: ' + message
);
348 Dygraph
.prototype.info
= function(message
) {
349 this.log(Dygraph
.INFO
, message
);
351 Dygraph
.prototype.warn
= function(message
) {
352 this.log(Dygraph
.WARNING
, message
);
354 Dygraph
.prototype.error
= function(message
) {
355 this.log(Dygraph
.ERROR
, message
);
359 * Returns the current rolling period, as set by the user or an option.
360 * @return {Number} The number of days in the rolling window
362 Dygraph
.prototype.rollPeriod
= function() {
363 return this.rollPeriod_
;
367 * Returns the currently-visible x-range. This can be affected by zooming,
368 * panning or a call to updateOptions.
369 * Returns a two-element array: [left, right].
370 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
372 Dygraph
.prototype.xAxisRange
= function() {
373 if (this.dateWindow_
) return this.dateWindow_
;
375 // The entire chart is visible.
376 var left
= this.rawData_
[0][0];
377 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
378 return [left
, right
];
382 * Returns the currently-visible y-range for an axis. This can be affected by
383 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
384 * called with no arguments, returns the range of the first axis.
385 * Returns a two-element array: [bottom, top].
387 Dygraph
.prototype.yAxisRange
= function(idx
) {
388 if (typeof(idx
) == "undefined") idx
= 0;
389 if (idx
< 0 || idx
>= this.axes_
.length
) return null;
390 return [ this.axes_
[idx
].computedValueRange
[0],
391 this.axes_
[idx
].computedValueRange
[1] ];
395 * Returns the currently-visible y-ranges for each axis. This can be affected by
396 * zooming, panning, calls to updateOptions, etc.
397 * Returns an array of [bottom, top] pairs, one for each y-axis.
399 Dygraph
.prototype.yAxisRanges
= function() {
401 for (var i
= 0; i
< this.axes_
.length
; i
++) {
402 ret
.push(this.yAxisRange(i
));
407 // TODO(danvk): use these functions throughout dygraphs.
409 * Convert from data coordinates to canvas/div X/Y coordinates.
410 * If specified, do this conversion for the coordinate system of a particular
411 * axis. Uses the first axis by default.
412 * Returns a two-element array: [X, Y]
414 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
415 var ret
= [null, null];
416 var area
= this.plotter_
.area
;
418 var xRange
= this.xAxisRange();
419 ret
[0] = area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
423 var yRange
= this.yAxisRange(axis
);
424 ret
[1] = area
.y
+ (yRange
[1] - y
) / (yRange
[1] - yRange
[0]) * area
.h
;
431 * Convert from canvas/div coords to data coordinates.
432 * If specified, do this conversion for the coordinate system of a particular
433 * axis. Uses the first axis by default.
434 * Returns a two-element array: [X, Y]
436 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
437 var ret
= [null, null];
438 var area
= this.plotter_
.area
;
440 var xRange
= this.xAxisRange();
441 ret
[0] = xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
445 var yRange
= this.yAxisRange(axis
);
446 ret
[1] = yRange
[0] + (area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
453 * Returns the number of columns (including the independent variable).
455 Dygraph
.prototype.numColumns
= function() {
456 return this.rawData_
[0].length
;
460 * Returns the number of rows (excluding any header/label row).
462 Dygraph
.prototype.numRows
= function() {
463 return this.rawData_
.length
;
467 * Returns the value in the given row and column. If the row and column exceed
468 * the bounds on the data, returns null. Also returns null if the value is
471 Dygraph
.prototype.getValue
= function(row
, col
) {
472 if (row
< 0 || row
> this.rawData_
.length
) return null;
473 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
475 return this.rawData_
[row
][col
];
478 Dygraph
.addEvent
= function(el
, evt
, fn
) {
479 var normed_fn
= function(e
) {
480 if (!e
) var e
= window
.event
;
483 if (window
.addEventListener
) { // Mozilla, Netscape, Firefox
484 el
.addEventListener(evt
, normed_fn
, false);
486 el
.attachEvent('on' + evt
, normed_fn
);
491 // Based on the article at
492 // http://www.switchonthecode.com/tutorials
/javascript
-tutorial
-the
-scroll
-wheel
493 Dygraph
.cancelEvent
= function(e
) {
494 e
= e
? e
: window
.event
;
495 if (e
.stopPropagation
) {
498 if (e
.preventDefault
) {
501 e
.cancelBubble
= true;
503 e
.returnValue
= false;
508 * Generates interface elements for the Dygraph: a containing div, a div to
509 * display the current point, and a textbox to adjust the rolling average
510 * period. Also creates the Renderer/Layout elements.
513 Dygraph
.prototype.createInterface_
= function() {
514 // Create the all-enclosing graph div
515 var enclosing
= this.maindiv_
;
517 this.graphDiv
= document
.createElement("div");
518 this.graphDiv
.style
.width
= this.width_
+ "px";
519 this.graphDiv
.style
.height
= this.height_
+ "px";
520 enclosing
.appendChild(this.graphDiv
);
522 // Create the canvas for interactive parts of the chart.
523 this.canvas_
= Dygraph
.createCanvas();
524 this.canvas_
.style
.position
= "absolute";
525 this.canvas_
.width
= this.width_
;
526 this.canvas_
.height
= this.height_
;
527 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
528 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
530 // ... and for static parts of the chart.
531 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
533 // The interactive parts of the graph are drawn on top of the chart.
534 this.graphDiv
.appendChild(this.hidden_
);
535 this.graphDiv
.appendChild(this.canvas_
);
536 this.mouseEventElement_
= this.canvas_
;
539 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(e
) {
540 dygraph
.mouseMove_(e
);
542 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(e
) {
543 dygraph
.mouseOut_(e
);
546 // Create the grapher
547 // TODO(danvk): why does the Layout need its own set of options?
548 this.layoutOptions_
= { 'xOriginIsZero': false };
549 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
550 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
551 Dygraph
.update(this.layoutOptions_
, {
552 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) });
554 this.layout_
= new DygraphLayout(this, this.layoutOptions_
);
556 // TODO(danvk): why does the Renderer need its own set of options?
557 this.renderOptions_
= { colorScheme
: this.colors_
,
559 axisLineWidth
: Dygraph
.AXIS_LINE_WIDTH
};
560 Dygraph
.update(this.renderOptions_
, this.attrs_
);
561 Dygraph
.update(this.renderOptions_
, this.user_attrs_
);
563 this.createStatusMessage_();
564 this.createDragInterface_();
568 * Detach DOM elements in the dygraph and null out all data references.
569 * Calling this when you're done with a dygraph can dramatically reduce memory
570 * usage. See, e.g., the tests/perf.html example.
572 Dygraph
.prototype.destroy
= function() {
573 var removeRecursive
= function(node
) {
574 while (node
.hasChildNodes()) {
575 removeRecursive(node
.firstChild
);
576 node
.removeChild(node
.firstChild
);
579 removeRecursive(this.maindiv_
);
581 var nullOut
= function(obj
) {
583 if (typeof(obj
[n
]) === 'object') {
589 // These may not all be necessary, but it can't hurt...
590 nullOut(this.layout_
);
591 nullOut(this.plotter_
);
596 * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on
597 * this particular canvas. All Dygraph work is done on this.canvas_.
598 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
599 * @return {Object} The newly-created canvas
602 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
603 var h
= Dygraph
.createCanvas();
604 h
.style
.position
= "absolute";
605 // TODO(danvk): h should be offset from canvas. canvas needs to include
606 // some extra area to make it easier to zoom in on the far left and far
607 // right. h needs to be precisely the plot area, so that clipping occurs.
608 h
.style
.top
= canvas
.style
.top
;
609 h
.style
.left
= canvas
.style
.left
;
610 h
.width
= this.width_
;
611 h
.height
= this.height_
;
612 h
.style
.width
= this.width_
+ "px"; // for IE
613 h
.style
.height
= this.height_
+ "px"; // for IE
617 // Taken from MochiKit.Color
618 Dygraph
.hsvToRGB
= function (hue
, saturation
, value
) {
622 if (saturation
=== 0) {
627 var i
= Math
.floor(hue
* 6);
628 var f
= (hue
* 6) - i
;
629 var p
= value
* (1 - saturation
);
630 var q
= value
* (1 - (saturation
* f
));
631 var t
= value
* (1 - (saturation
* (1 - f
)));
633 case 1: red
= q
; green
= value
; blue
= p
; break;
634 case 2: red
= p
; green
= value
; blue
= t
; break;
635 case 3: red
= p
; green
= q
; blue
= value
; break;
636 case 4: red
= t
; green
= p
; blue
= value
; break;
637 case 5: red
= value
; green
= p
; blue
= q
; break;
638 case 6: // fall through
639 case 0: red
= value
; green
= t
; blue
= p
; break;
642 red
= Math
.floor(255 * red
+ 0.5);
643 green
= Math
.floor(255 * green
+ 0.5);
644 blue
= Math
.floor(255 * blue
+ 0.5);
645 return 'rgb(' + red
+ ',' + green
+ ',' + blue
+ ')';
650 * Generate a set of distinct colors for the data series. This is done with a
651 * color wheel. Saturation/Value are customizable, and the hue is
652 * equally-spaced around the color wheel. If a custom set of colors is
653 * specified, that is used instead.
656 Dygraph
.prototype.setColors_
= function() {
657 // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do
658 // away with this.renderOptions_.
659 var num
= this.attr_("labels").length
- 1;
661 var colors
= this.attr_('colors');
663 var sat
= this.attr_('colorSaturation') || 1.0;
664 var val
= this.attr_('colorValue') || 0.5;
665 var half
= Math
.ceil(num
/ 2);
666 for (var i
= 1; i
<= num
; i
++) {
667 if (!this.visibility()[i
-1]) continue;
668 // alternate colors for high contrast.
669 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
670 var hue
= (1.0 * idx
/ (1 + num
));
671 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
674 for (var i
= 0; i
< num
; i
++) {
675 if (!this.visibility()[i
]) continue;
676 var colorStr
= colors
[i
% colors
.length
];
677 this.colors_
.push(colorStr
);
681 // TODO(danvk): update this w/r
/t/ the
new options system
.
682 this.renderOptions_
.colorScheme
= this.colors_
;
683 Dygraph
.update(this.plotter_
.options
, this.renderOptions_
);
684 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
685 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
689 * Return the list of colors. This is either the list of colors passed in the
690 * attributes, or the autogenerated list of rgb(r,g,b) strings.
691 * @return {Array<string>} The list of colors.
693 Dygraph
.prototype.getColors
= function() {
697 // The following functions are from quirksmode.org with a modification for Safari from
698 // http://blog.firetree.net/2005/07/04/javascript-find-position/
699 // http://www.quirksmode.org/js
/findpos
.html
700 Dygraph
.findPosX
= function(obj
) {
705 curleft
+= obj
.offsetLeft
;
706 if(!obj
.offsetParent
)
708 obj
= obj
.offsetParent
;
715 Dygraph
.findPosY
= function(obj
) {
720 curtop
+= obj
.offsetTop
;
721 if(!obj
.offsetParent
)
723 obj
= obj
.offsetParent
;
733 * Create the div that contains information on the selected point(s)
734 * This goes in the top right of the canvas, unless an external div has already
738 Dygraph
.prototype.createStatusMessage_
= function() {
739 var userLabelsDiv
= this.user_attrs_
["labelsDiv"];
740 if (userLabelsDiv
&& null != userLabelsDiv
741 && (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
742 this.user_attrs_
["labelsDiv"] = document
.getElementById(userLabelsDiv
);
744 if (!this.attr_("labelsDiv")) {
745 var divWidth
= this.attr_('labelsDivWidth');
747 "position": "absolute",
750 "width": divWidth
+ "px",
752 "left": (this.width_
- divWidth
- 2) + "px",
753 "background": "white",
755 "overflow": "hidden"};
756 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
757 var div
= document
.createElement("div");
758 for (var name
in messagestyle
) {
759 if (messagestyle
.hasOwnProperty(name
)) {
760 div
.style
[name
] = messagestyle
[name
];
763 this.graphDiv
.appendChild(div
);
764 this.attrs_
.labelsDiv
= div
;
769 * Position the labels div so that its right edge is flush with the right edge
770 * of the charting area.
772 Dygraph
.prototype.positionLabelsDiv_
= function() {
773 // Don't touch a user-specified labelsDiv.
774 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
776 var area
= this.plotter_
.area
;
777 var div
= this.attr_("labelsDiv");
778 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
782 * Create the text box to adjust the averaging period
785 Dygraph
.prototype.createRollInterface_
= function() {
786 // Create a roller if one doesn't exist already.
788 this.roller_
= document
.createElement("input");
789 this.roller_
.type
= "text";
790 this.roller_
.style
.display
= "none";
791 this.graphDiv
.appendChild(this.roller_
);
794 var display
= this.attr_('showRoller') ? 'block' : 'none';
796 var textAttr
= { "position": "absolute",
798 "top": (this.plotter_
.area
.h
- 25) + "px",
799 "left": (this.plotter_
.area
.x
+ 1) + "px",
802 this.roller_
.size
= "2";
803 this.roller_
.value
= this.rollPeriod_
;
804 for (var name
in textAttr
) {
805 if (textAttr
.hasOwnProperty(name
)) {
806 this.roller_
.style
[name
] = textAttr
[name
];
811 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
814 // These functions are taken from MochiKit.Signal
815 Dygraph
.pageX
= function(e
) {
817 return (!e
.pageX
|| e
.pageX
< 0) ? 0 : e
.pageX
;
820 var b
= document
.body
;
822 (de
.scrollLeft
|| b
.scrollLeft
) -
823 (de
.clientLeft
|| 0);
827 Dygraph
.pageY
= function(e
) {
829 return (!e
.pageY
|| e
.pageY
< 0) ? 0 : e
.pageY
;
832 var b
= document
.body
;
834 (de
.scrollTop
|| b
.scrollTop
) -
839 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
840 return Dygraph
.pageX(e
) - context
.px
843 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
844 return Dygraph
.pageY(e
) - context
.py
847 // Called in response to an interaction model operation that
848 // should start the default panning behavior.
850 // It's used in the default callback for "mousedown" operations.
851 // Custom interaction model builders can use it to provide the default
854 Dygraph
.startPan
= function(event
, g
, context
) {
855 // have to be zoomed in to pan.
856 // TODO(konigsberg): Let's loosen this zoom-to-pan restriction, also
857 // perhaps create panning boundaries? A more flexible pan would make it,
858 // ahem, 'pan-useful'.
860 for (var i
= 0; i
< g
.axes_
.length
; i
++) {
861 if (g
.axes_
[i
].valueWindow
|| g
.axes_
[i
].valueRange
) {
866 if (!g
.dateWindow_
&& !zoomedY
) return;
868 context
.isPanning
= true;
869 var xRange
= g
.xAxisRange();
870 context
.dateRange
= xRange
[1] - xRange
[0];
872 // Record the range of each y-axis at the start of the drag.
873 // If any axis has a valueRange or valueWindow, then we want a 2D pan.
874 context
.is2DPan
= false;
875 for (var i
= 0; i
< g
.axes_
.length
; i
++) {
876 var axis
= g
.axes_
[i
];
877 var yRange
= g
.yAxisRange(i
);
878 axis
.dragValueRange
= yRange
[1] - yRange
[0];
879 var r
= g
.toDataCoords(null, context
.dragStartY
, i
);
880 axis
.draggingValue
= r
[1];
881 if (axis
.valueWindow
|| axis
.valueRange
) context
.is2DPan
= true;
884 // TODO(konigsberg): Switch from all this math to toDataCoords?
885 // Seems to work for the dragging value.
886 context
.draggingDate
= (context
.dragStartX
/ g
.width_
) * context
.dateRange
+ xRange
[0];
889 // Called in response to an interaction model operation that
890 // responds to an event that pans the view.
892 // It's used in the default callback for "mousemove" operations.
893 // Custom interaction model builders can use it to provide the default
896 Dygraph
.movePan
= function(event
, g
, context
) {
897 context
.dragEndX
= g
.dragGetX_(event
, context
);
898 context
.dragEndY
= g
.dragGetY_(event
, context
);
900 // TODO(danvk): update this comment
901 // Want to have it so that:
902 // 1. draggingDate appears at dragEndX, draggingValue appears at dragEndY.
903 // 2. daterange = (dateWindow_[1] - dateWindow_[0]) is unaltered.
904 // 3. draggingValue appears at dragEndY.
905 // 4. valueRange is unaltered.
907 var minDate
= context
.draggingDate
- (context
.dragEndX
/ g
.width_
) * context
.dateRange
;
908 var maxDate
= minDate
+ context
.dateRange
;
909 g
.dateWindow_
= [minDate
, maxDate
];
911 // y-axis scaling is automatic unless this is a full 2D pan.
912 if (context
.is2DPan
) {
913 // Adjust each axis appropriately.
914 var y_frac
= context
.dragEndY
/ g
.height_
;
915 for (var i
= 0; i
< g
.axes_
.length
; i
++) {
916 var axis
= g
.axes_
[i
];
917 var maxValue
= axis
.draggingValue
+ y_frac
* axis
.dragValueRange
;
918 var minValue
= maxValue
- axis
.dragValueRange
;
919 axis
.valueWindow
= [ minValue
, maxValue
];
926 // Called in response to an interaction model operation that
927 // responds to an event that ends panning.
929 // It's used in the default callback for "mouseup" operations.
930 // Custom interaction model builders can use it to provide the default
933 Dygraph
.endPan
= function(event
, g
, context
) {
934 context
.isPanning
= false;
935 context
.is2DPan
= false;
936 context
.draggingDate
= null;
937 context
.dateRange
= null;
938 context
.valueRange
= null;
941 // Called in response to an interaction model operation that
942 // responds to an event that starts zooming.
944 // It's used in the default callback for "mousedown" operations.
945 // Custom interaction model builders can use it to provide the default
948 Dygraph
.startZoom
= function(event
, g
, context
) {
949 context
.isZooming
= true;
952 // Called in response to an interaction model operation that
953 // responds to an event that defines zoom boundaries.
955 // It's used in the default callback for "mousemove" operations.
956 // Custom interaction model builders can use it to provide the default
959 Dygraph
.moveZoom
= function(event
, g
, context
) {
960 context
.dragEndX
= g
.dragGetX_(event
, context
);
961 context
.dragEndY
= g
.dragGetY_(event
, context
);
963 var xDelta
= Math
.abs(context
.dragStartX
- context
.dragEndX
);
964 var yDelta
= Math
.abs(context
.dragStartY
- context
.dragEndY
);
966 // drag direction threshold for y axis is twice as large as x axis
967 context
.dragDirection
= (xDelta
< yDelta
/ 2) ? Dygraph
.VERTICAL
: Dygraph
.HORIZONTAL
;
970 context
.dragDirection
,
975 context
.prevDragDirection
,
979 context
.prevEndX
= context
.dragEndX
;
980 context
.prevEndY
= context
.dragEndY
;
981 context
.prevDragDirection
= context
.dragDirection
;
984 // Called in response to an interaction model operation that
985 // responds to an event that performs a zoom based on previously defined
988 // It's used in the default callback for "mouseup" operations.
989 // Custom interaction model builders can use it to provide the default
992 Dygraph
.endZoom
= function(event
, g
, context
) {
993 context
.isZooming
= false;
994 context
.dragEndX
= g
.dragGetX_(event
, context
);
995 context
.dragEndY
= g
.dragGetY_(event
, context
);
996 var regionWidth
= Math
.abs(context
.dragEndX
- context
.dragStartX
);
997 var regionHeight
= Math
.abs(context
.dragEndY
- context
.dragStartY
);
999 if (regionWidth
< 2 && regionHeight
< 2 &&
1000 g
.lastx_
!= undefined
&& g
.lastx_
!= -1) {
1001 // TODO(danvk): pass along more info about the points, e.g. 'x'
1002 if (g
.attr_('clickCallback') != null) {
1003 g
.attr_('clickCallback')(event
, g
.lastx_
, g
.selPoints_
);
1005 if (g
.attr_('pointClickCallback')) {
1006 // check if the click was on a particular point.
1007 var closestIdx
= -1;
1008 var closestDistance
= 0;
1009 for (var i
= 0; i
< g
.selPoints_
.length
; i
++) {
1010 var p
= g
.selPoints_
[i
];
1011 var distance
= Math
.pow(p
.canvasx
- context
.dragEndX
, 2) +
1012 Math
.pow(p
.canvasy
- context
.dragEndY
, 2);
1013 if (closestIdx
== -1 || distance
< closestDistance
) {
1014 closestDistance
= distance
;
1019 // Allow any click within two pixels of the dot.
1020 var radius
= g
.attr_('highlightCircleSize') + 2;
1021 if (closestDistance
<= 5 * 5) {
1022 g
.attr_('pointClickCallback')(event
, g
.selPoints_
[closestIdx
]);
1027 if (regionWidth
>= 10 && context
.dragDirection
== Dygraph
.HORIZONTAL
) {
1028 g
.doZoomX_(Math
.min(context
.dragStartX
, context
.dragEndX
),
1029 Math
.max(context
.dragStartX
, context
.dragEndX
));
1030 } else if (regionHeight
>= 10 && context
.dragDirection
== Dygraph
.VERTICAL
) {
1031 g
.doZoomY_(Math
.min(context
.dragStartY
, context
.dragEndY
),
1032 Math
.max(context
.dragStartY
, context
.dragEndY
));
1034 g
.canvas_
.getContext("2d").clearRect(0, 0,
1038 context
.dragStartX
= null;
1039 context
.dragStartY
= null;
1042 Dygraph
.defaultInteractionModel
= {
1043 // Track the beginning of drag events
1044 mousedown
: function(event
, g
, context
) {
1045 context
.initializeMouseDown(event
, g
, context
);
1047 if (event
.altKey
|| event
.shiftKey
) {
1048 Dygraph
.startPan(event
, g
, context
);
1050 Dygraph
.startZoom(event
, g
, context
);
1054 // Draw zoom rectangles when the mouse is down and the user moves around
1055 mousemove
: function(event
, g
, context
) {
1056 if (context
.isZooming
) {
1057 Dygraph
.moveZoom(event
, g
, context
);
1058 } else if (context
.isPanning
) {
1059 Dygraph
.movePan(event
, g
, context
);
1063 mouseup
: function(event
, g
, context
) {
1064 if (context
.isZooming
) {
1065 Dygraph
.endZoom(event
, g
, context
);
1066 } else if (context
.isPanning
) {
1067 Dygraph
.endPan(event
, g
, context
);
1071 // Temporarily cancel the dragging event when the mouse leaves the graph
1072 mouseout
: function(event
, g
, context
) {
1073 if (context
.isZooming
) {
1074 context
.dragEndX
= null;
1075 context
.dragEndY
= null;
1079 // Disable zooming out if panning.
1080 dblclick
: function(event
, g
, context
) {
1081 if (event
.altKey
|| event
.shiftKey
) {
1084 // TODO(konigsberg): replace g.doUnzoom()_ with something that is
1085 // friendlier to public use.
1090 Dygraph
.DEFAULT_ATTRS
.interactionModel
= Dygraph
.defaultInteractionModel
;
1093 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1097 Dygraph
.prototype.createDragInterface_
= function() {
1099 // Tracks whether the mouse is down right now
1101 isPanning
: false, // is this drag part of a pan?
1102 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1107 dragDirection
: null,
1110 prevDragDirection
: null,
1112 // TODO(danvk): update this comment
1113 // draggingDate and draggingValue represent the [date,value] point on the
1114 // graph at which the mouse was pressed. As the mouse moves while panning,
1115 // the viewport must pan so that the mouse position points to
1116 // [draggingDate, draggingValue]
1119 // TODO(danvk): update this comment
1120 // The range in second/value units that the viewport encompasses during a
1121 // panning operation.
1124 // Utility function to convert page-wide coordinates to canvas coords
1128 initializeMouseDown
: function(event
, g
, context
) {
1129 // prevents mouse drags from selecting page text.
1130 if (event
.preventDefault
) {
1131 event
.preventDefault(); // Firefox, Chrome, etc.
1133 event
.returnValue
= false; // IE
1134 event
.cancelBubble
= true;
1137 context
.px
= Dygraph
.findPosX(g
.canvas_
);
1138 context
.py
= Dygraph
.findPosY(g
.canvas_
);
1139 context
.dragStartX
= g
.dragGetX_(event
, context
);
1140 context
.dragStartY
= g
.dragGetY_(event
, context
);
1144 var interactionModel
= this.attr_("interactionModel");
1146 // Self is the graph.
1149 // Function that binds the graph and context to the handler.
1150 var bindHandler
= function(handler
) {
1151 return function(event
) {
1152 handler(event
, self
, context
);
1156 for (var eventName
in interactionModel
) {
1157 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1158 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
1159 bindHandler(interactionModel
[eventName
]));
1162 // If the user releases the mouse button during a drag, but not over the
1163 // canvas, then it doesn't count as a zooming action.
1164 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
1165 if (context
.isZooming
|| context
.isPanning
) {
1166 context
.isZooming
= false;
1167 context
.dragStartX
= null;
1168 context
.dragStartY
= null;
1171 if (context
.isPanning
) {
1172 context
.isPanning
= false;
1173 context
.draggingDate
= null;
1174 context
.dateRange
= null;
1175 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1176 delete self
.axes_
[i
].draggingValue
;
1177 delete self
.axes_
[i
].dragValueRange
;
1184 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1185 * up any previous zoom rectangles that were drawn. This could be optimized to
1186 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1189 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1190 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1191 * @param {Number} startX The X position where the drag started, in canvas
1193 * @param {Number} endX The current X position of the drag, in canvas coords.
1194 * @param {Number} startY The Y position where the drag started, in canvas
1196 * @param {Number} endY The current Y position of the drag, in canvas coords.
1197 * @param {Number} prevDirection the value of direction on the previous call to
1198 * this function. Used to avoid excess redrawing
1199 * @param {Number} prevEndX The value of endX on the previous call to this
1200 * function. Used to avoid excess redrawing
1201 * @param {Number} prevEndY The value of endY on the previous call to this
1202 * function. Used to avoid excess redrawing
1205 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
, endY
,
1206 prevDirection
, prevEndX
, prevEndY
) {
1207 var ctx
= this.canvas_
.getContext("2d");
1209 // Clean up from the previous rect if necessary
1210 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1211 ctx
.clearRect(Math
.min(startX
, prevEndX
), 0,
1212 Math
.abs(startX
- prevEndX
), this.height_
);
1213 } else if (prevDirection
== Dygraph
.VERTICAL
){
1214 ctx
.clearRect(0, Math
.min(startY
, prevEndY
),
1215 this.width_
, Math
.abs(startY
- prevEndY
));
1218 // Draw a light-grey rectangle to show the new viewing area
1219 if (direction
== Dygraph
.HORIZONTAL
) {
1220 if (endX
&& startX
) {
1221 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1222 ctx
.fillRect(Math
.min(startX
, endX
), 0,
1223 Math
.abs(endX
- startX
), this.height_
);
1226 if (direction
== Dygraph
.VERTICAL
) {
1227 if (endY
&& startY
) {
1228 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1229 ctx
.fillRect(0, Math
.min(startY
, endY
),
1230 this.width_
, Math
.abs(endY
- startY
));
1236 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1237 * the canvas. The exact zoom window may be slightly larger if there are no data
1238 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1239 * which accepts dates that match the raw data. This function redraws the graph.
1241 * @param {Number} lowX The leftmost pixel value that should be visible.
1242 * @param {Number} highX The rightmost pixel value that should be visible.
1245 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1246 // Find the earliest and latest dates contained in this canvasx range.
1247 // Convert the call to date ranges of the raw data.
1248 var r
= this.toDataCoords(lowX
, null);
1250 r
= this.toDataCoords(highX
, null);
1252 this.doZoomXDates_(minDate
, maxDate
);
1256 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1257 * method with doZoomX which accepts pixel coordinates. This function redraws
1260 * @param {Number} minDate The minimum date that should be visible.
1261 * @param {Number} maxDate The maximum date that should be visible.
1264 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1265 this.dateWindow_
= [minDate
, maxDate
];
1267 if (this.attr_("zoomCallback")) {
1268 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1273 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1274 * the canvas. This function redraws the graph.
1276 * @param {Number} lowY The topmost pixel value that should be visible.
1277 * @param {Number} highY The lowest pixel value that should be visible.
1280 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1281 // Find the highest and lowest values in pixel range for each axis.
1282 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1283 // This is because pixels increase as you go down on the screen, whereas data
1284 // coordinates increase as you go up the screen.
1285 var valueRanges
= [];
1286 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1287 var hi
= this.toDataCoords(null, lowY
, i
);
1288 var low
= this.toDataCoords(null, highY
, i
);
1289 this.axes_
[i
].valueWindow
= [low
[1], hi
[1]];
1290 valueRanges
.push([low
[1], hi
[1]]);
1294 if (this.attr_("zoomCallback")) {
1295 var xRange
= this.xAxisRange();
1296 this.attr_("zoomCallback")(xRange
[0], xRange
[1], this.yAxisRanges());
1301 * Reset the zoom to the original view coordinates. This is the same as
1302 * double-clicking on the graph.
1306 Dygraph
.prototype.doUnzoom_
= function() {
1308 if (this.dateWindow_
!= null) {
1310 this.dateWindow_
= null;
1313 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1314 if (this.axes_
[i
].valueWindow
!= null) {
1316 delete this.axes_
[i
].valueWindow
;
1321 // Putting the drawing operation before the callback because it resets
1324 if (this.attr_("zoomCallback")) {
1325 var minDate
= this.rawData_
[0][0];
1326 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1327 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1333 * When the mouse moves in the canvas, display information about a nearby data
1334 * point and draw dots over those points in the data series. This function
1335 * takes care of cleanup of previously-drawn dots.
1336 * @param {Object} event The mousemove event from the browser.
1339 Dygraph
.prototype.mouseMove_
= function(event
) {
1340 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1341 var points
= this.layout_
.points
;
1346 // Loop through all the points and find the date nearest to our current
1348 var minDist
= 1e+100;
1350 for (var i
= 0; i
< points
.length
; i
++) {
1351 var point
= points
[i
];
1352 if (point
== null) continue;
1353 var dist
= Math
.abs(point
.canvasx
- canvasx
);
1354 if (dist
> minDist
) continue;
1358 if (idx
>= 0) lastx
= points
[idx
].xval
;
1359 // Check that you can really highlight the last day's data
1360 var last
= points
[points
.length
-1];
1361 if (last
!= null && canvasx
> last
.canvasx
)
1362 lastx
= points
[points
.length
-1].xval
;
1364 // Extract the points we've selected
1365 this.selPoints_
= [];
1366 var l
= points
.length
;
1367 if (!this.attr_("stackedGraph")) {
1368 for (var i
= 0; i
< l
; i
++) {
1369 if (points
[i
].xval
== lastx
) {
1370 this.selPoints_
.push(points
[i
]);
1374 // Need to 'unstack' points starting from the bottom
1375 var cumulative_sum
= 0;
1376 for (var i
= l
- 1; i
>= 0; i
--) {
1377 if (points
[i
].xval
== lastx
) {
1378 var p
= {}; // Clone the point since we modify it
1379 for (var k
in points
[i
]) {
1380 p
[k
] = points
[i
][k
];
1382 p
.yval
-= cumulative_sum
;
1383 cumulative_sum
+= p
.yval
;
1384 this.selPoints_
.push(p
);
1387 this.selPoints_
.reverse();
1390 if (this.attr_("highlightCallback")) {
1391 var px
= this.lastx_
;
1392 if (px
!== null && lastx
!= px
) {
1393 // only fire if the selected point has changed.
1394 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
, this.idxToRow_(idx
));
1398 // Save last x position for callbacks.
1399 this.lastx_
= lastx
;
1401 this.updateSelection_();
1405 * Transforms layout_.points index into data row number.
1406 * @param int layout_.points index
1407 * @return int row number, or -1 if none could be found.
1410 Dygraph
.prototype.idxToRow_
= function(idx
) {
1411 if (idx
< 0) return -1;
1413 for (var i
in this.layout_
.datasets
) {
1414 if (idx
< this.layout_
.datasets
[i
].length
) {
1415 return this.boundaryIds_
[0][0]+idx
;
1417 idx
-= this.layout_
.datasets
[i
].length
;
1423 * Draw dots over the selectied points in the data series. This function
1424 * takes care of cleanup of previously-drawn dots.
1427 Dygraph
.prototype.updateSelection_
= function() {
1428 // Clear the previously drawn vertical, if there is one
1429 var ctx
= this.canvas_
.getContext("2d");
1430 if (this.previousVerticalX_
>= 0) {
1431 // Determine the maximum highlight circle size.
1432 var maxCircleSize
= 0;
1433 var labels
= this.attr_('labels');
1434 for (var i
= 1; i
< labels
.length
; i
++) {
1435 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1436 if (r
> maxCircleSize
) maxCircleSize
= r
;
1438 var px
= this.previousVerticalX_
;
1439 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1440 2 * maxCircleSize
+ 2, this.height_
);
1443 var isOK
= function(x
) { return x
&& !isNaN(x
); };
1445 if (this.selPoints_
.length
> 0) {
1446 var canvasx
= this.selPoints_
[0].canvasx
;
1448 // Set the status message to indicate the selected point(s)
1449 var replace
= this.attr_('xValueFormatter')(
1450 this.lastx_
, this.numXDigits_
+ this.numExtraDigits_
) + ":";
1451 var fmtFunc
= this.attr_('yValueFormatter');
1452 var clen
= this.colors_
.length
;
1454 if (this.attr_('showLabelsOnHighlight')) {
1455 // Set the status message to indicate the selected point(s)
1456 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1457 if (!this.attr_("labelsShowZeroValues") && this.selPoints_
[i
].yval
== 0) continue;
1458 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1459 if (this.attr_("labelsSeparateLines")) {
1462 var point
= this.selPoints_
[i
];
1463 var c
= new RGBColor(this.plotter_
.colors
[point
.name
]);
1464 var yval
= fmtFunc(point
.yval
, this.numYDigits_
+ this.numExtraDigits_
);
1465 replace
+= " <b><font color='" + c
.toHex() + "'>"
1466 + point
.name
+ "</font></b>:"
1470 this.attr_("labelsDiv").innerHTML
= replace
;
1473 // Draw colored circles over the center of each selected point
1475 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1476 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1478 this.attr_('highlightCircleSize', this.selPoints_
[i
].name
);
1480 ctx
.fillStyle
= this.plotter_
.colors
[this.selPoints_
[i
].name
];
1481 ctx
.arc(canvasx
, this.selPoints_
[i
].canvasy
, circleSize
,
1482 0, 2 * Math
.PI
, false);
1487 this.previousVerticalX_
= canvasx
;
1492 * Set manually set selected dots, and display information about them
1493 * @param int row number that should by highlighted
1494 * false value clears the selection
1497 Dygraph
.prototype.setSelection
= function(row
) {
1498 // Extract the points we've selected
1499 this.selPoints_
= [];
1502 if (row
!== false) {
1503 row
= row
-this.boundaryIds_
[0][0];
1506 if (row
!== false && row
>= 0) {
1507 for (var i
in this.layout_
.datasets
) {
1508 if (row
< this.layout_
.datasets
[i
].length
) {
1509 var point
= this.layout_
.points
[pos
+row
];
1511 if (this.attr_("stackedGraph")) {
1512 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1515 this.selPoints_
.push(point
);
1517 pos
+= this.layout_
.datasets
[i
].length
;
1521 if (this.selPoints_
.length
) {
1522 this.lastx_
= this.selPoints_
[0].xval
;
1523 this.updateSelection_();
1526 this.clearSelection();
1532 * The mouse has left the canvas. Clear out whatever artifacts remain
1533 * @param {Object} event the mouseout event from the browser.
1536 Dygraph
.prototype.mouseOut_
= function(event
) {
1537 if (this.attr_("unhighlightCallback")) {
1538 this.attr_("unhighlightCallback")(event
);
1541 if (this.attr_("hideOverlayOnMouseOut")) {
1542 this.clearSelection();
1547 * Remove all selection from the canvas
1550 Dygraph
.prototype.clearSelection
= function() {
1551 // Get rid of the overlay data
1552 var ctx
= this.canvas_
.getContext("2d");
1553 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1554 this.attr_("labelsDiv").innerHTML
= "";
1555 this.selPoints_
= [];
1560 * Returns the number of the currently selected row
1561 * @return int row number, of -1 if nothing is selected
1564 Dygraph
.prototype.getSelection
= function() {
1565 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1569 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1570 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1571 return row
+ this.boundaryIds_
[0][0];
1577 Dygraph
.zeropad
= function(x
) {
1578 if (x
< 10) return "0" + x
; else return "" + x
;
1582 * Return a string version of the hours, minutes and seconds portion of a date.
1583 * @param {Number} date The JavaScript date (ms since epoch)
1584 * @return {String} A time of the form "HH:MM:SS"
1587 Dygraph
.hmsString_
= function(date
) {
1588 var zeropad
= Dygraph
.zeropad
;
1589 var d
= new Date(date
);
1590 if (d
.getSeconds()) {
1591 return zeropad(d
.getHours()) + ":" +
1592 zeropad(d
.getMinutes()) + ":" +
1593 zeropad(d
.getSeconds());
1595 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
1600 * Convert a JS date to a string appropriate to display on an axis that
1601 * is displaying values at the stated granularity.
1602 * @param {Date} date The date to format
1603 * @param {Number} granularity One of the Dygraph granularity constants
1604 * @return {String} The formatted date
1607 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1608 if (granularity
>= Dygraph
.DECADAL
) {
1609 return date
.strftime('%Y');
1610 } else if (granularity
>= Dygraph
.MONTHLY
) {
1611 return date
.strftime('%b %y');
1613 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1614 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1615 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1617 return Dygraph
.hmsString_(date
.getTime());
1623 * Convert a JS date (millis since epoch) to YYYY/MM/DD
1624 * @param {Number} date The JavaScript date (ms since epoch)
1625 * @return {String} A date of the form "YYYY/MM/DD"
1628 Dygraph
.dateString_
= function(date
) {
1629 var zeropad
= Dygraph
.zeropad
;
1630 var d
= new Date(date
);
1633 var year
= "" + d
.getFullYear();
1634 // Get a 0 padded month string
1635 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
1636 // Get a 0 padded day string
1637 var day
= zeropad(d
.getDate());
1640 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1641 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
1643 return year
+ "/" + month + "/" + day
+ ret
;
1647 * Round a number to the specified number of digits past the decimal point.
1648 * @param {Number} num The number to round
1649 * @param {Number} places The number of decimals to which to round
1650 * @return {Number} The rounded number
1653 Dygraph
.round_
= function(num
, places
) {
1654 var shift
= Math
.pow(10, places
);
1655 return Math
.round(num
* shift
)/shift
;
1659 * Fires when there's data available to be graphed.
1660 * @param {String} data Raw CSV data to be plotted
1663 Dygraph
.prototype.loadedEvent_
= function(data
) {
1664 this.rawData_
= this.parseCSV_(data
);
1668 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1669 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1670 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1673 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1676 Dygraph
.prototype.addXTicks_
= function() {
1677 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1678 var opts
= {xTicks
: []};
1679 var formatter
= this.attr_('xTicker');
1680 if (this.dateWindow_
) {
1681 opts
.xTicks
= formatter(this.dateWindow_
[0], this.dateWindow_
[1], this);
1683 // numericTicks() returns multiple values.
1684 var ret
= formatter(this.rawData_
[0][0],
1685 this.rawData_
[this.rawData_
.length
- 1][0], this);
1686 opts
.xTicks
= ret
.ticks
;
1687 this.numXDigits_
= ret
.numDigits
;
1689 this.layout_
.updateOptions(opts
);
1692 // Time granularity enumeration
1693 Dygraph
.SECONDLY
= 0;
1694 Dygraph
.TWO_SECONDLY
= 1;
1695 Dygraph
.FIVE_SECONDLY
= 2;
1696 Dygraph
.TEN_SECONDLY
= 3;
1697 Dygraph
.THIRTY_SECONDLY
= 4;
1698 Dygraph
.MINUTELY
= 5;
1699 Dygraph
.TWO_MINUTELY
= 6;
1700 Dygraph
.FIVE_MINUTELY
= 7;
1701 Dygraph
.TEN_MINUTELY
= 8;
1702 Dygraph
.THIRTY_MINUTELY
= 9;
1703 Dygraph
.HOURLY
= 10;
1704 Dygraph
.TWO_HOURLY
= 11;
1705 Dygraph
.SIX_HOURLY
= 12;
1707 Dygraph
.WEEKLY
= 14;
1708 Dygraph
.MONTHLY
= 15;
1709 Dygraph
.QUARTERLY
= 16;
1710 Dygraph
.BIANNUAL
= 17;
1711 Dygraph
.ANNUAL
= 18;
1712 Dygraph
.DECADAL
= 19;
1713 Dygraph
.CENTENNIAL
= 20;
1714 Dygraph
.NUM_GRANULARITIES
= 21;
1716 Dygraph
.SHORT_SPACINGS
= [];
1717 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1718 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1719 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1720 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1721 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1722 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1723 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1724 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1725 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1726 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1727 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1728 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1729 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1730 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1731 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1735 // If we used this time granularity, how many ticks would there be?
1736 // This is only an approximation, but it's generally good enough.
1738 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1739 if (granularity
< Dygraph
.MONTHLY
) {
1740 // Generate one tick mark for every fixed interval of time.
1741 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1742 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1744 var year_mod
= 1; // e.g. to only print one point every 10 years.
1745 var num_months
= 12;
1746 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1747 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1748 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1749 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1750 if (granularity
== Dygraph
.CENTENNIAL
) { num_months
= 1; year_mod
= 100; }
1752 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1753 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1754 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1760 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1761 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1763 // Returns an array containing {v: millis, label: label} dictionaries.
1765 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1766 var formatter
= this.attr_("xAxisLabelFormatter");
1768 if (granularity
< Dygraph
.MONTHLY
) {
1769 // Generate one tick mark for every fixed interval of time.
1770 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1771 var format
= '%d%b'; // e.g. "1Jan"
1773 // Find a time less than start_time which occurs on a "nice" time boundary
1774 // for this granularity.
1775 var g
= spacing
/ 1000;
1776 var d
= new Date(start_time
);
1777 if (g
<= 60) { // seconds
1778 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1782 if (g
<= 60) { // minutes
1783 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1788 if (g
<= 24) { // days
1789 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1794 if (g
== 7) { // one week
1795 d
.setDate(d
.getDate() - d
.getDay());
1800 start_time
= d
.getTime();
1802 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1803 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1806 // Display a tick mark on the first of a set of months of each year.
1807 // Years get a tick mark iff y % year_mod == 0. This is useful for
1808 // displaying a tick mark once every 10 years, say, on long time scales.
1810 var year_mod
= 1; // e.g. to only print one point every 10 years.
1812 if (granularity
== Dygraph
.MONTHLY
) {
1813 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1814 } else if (granularity
== Dygraph
.QUARTERLY
) {
1815 months
= [ 0, 3, 6, 9 ];
1816 } else if (granularity
== Dygraph
.BIANNUAL
) {
1818 } else if (granularity
== Dygraph
.ANNUAL
) {
1820 } else if (granularity
== Dygraph
.DECADAL
) {
1823 } else if (granularity
== Dygraph
.CENTENNIAL
) {
1827 this.warn("Span of dates is too long");
1830 var start_year
= new Date(start_time
).getFullYear();
1831 var end_year
= new Date(end_time
).getFullYear();
1832 var zeropad
= Dygraph
.zeropad
;
1833 for (var i
= start_year
; i
<= end_year
; i
++) {
1834 if (i
% year_mod
!= 0) continue;
1835 for (var j
= 0; j
< months
.length
; j
++) {
1836 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1837 var t
= Date
.parse(date_str
);
1838 if (t
< start_time
|| t
> end_time
) continue;
1839 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1849 * Add ticks to the x-axis based on a date range.
1850 * @param {Number} startDate Start of the date window (millis since epoch)
1851 * @param {Number} endDate End of the date window (millis since epoch)
1852 * @return {Array.<Object>} Array of {label, value} tuples.
1855 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1857 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1858 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1859 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1866 return self
.GetXAxis(startDate
, endDate
, chosen
);
1868 // TODO(danvk): signal error.
1873 * Determine the number of significant figures in a Number up to the specified
1874 * precision. Note that there is no way to determine if a trailing '0' is
1875 * significant or not, so by convention we return 1 for all of the following
1876 * inputs: 1, 1.0, 1.00, 1.000 etc.
1877 * @param {Number} x The input value.
1878 * @param {Number} opt_maxPrecision Optional maximum precision to consider.
1879 * Default and maximum allowed value is 13.
1880 * @return {Number} The number of significant figures which is >= 1.
1882 Dygraph
.significantFigures
= function(x
, opt_maxPrecision
) {
1883 var precision
= Math
.max(opt_maxPrecision
|| 13, 13);
1885 // Convert the number to its exponential notation form and work backwards,
1886 // ignoring the 'e+xx' bit. This may seem like a hack, but doing a loop and
1887 // dividing by 10 leads to roundoff errors. By using toExponential(), we let
1888 // the JavaScript interpreter handle the low level bits of the Number for us.
1889 var s
= x
.toExponential(precision
);
1890 var ePos
= s
.lastIndexOf('e'); // -1 case handled by return below.
1892 for (var i
= ePos
- 1; i
>= 0; i
--) {
1894 // Got to the decimal place. We'll call this 1 digit of precision because
1895 // we can't know for sure how many trailing 0s are significant.
1897 } else if (s
[i
] != '0') {
1898 // Found the first non-zero digit. Return the number of characters
1899 // except for the '.'.
1900 return i
; // This is i - 1 + 1 (-1 is for '.', +1 is for 0 based index).
1904 // Occurs if toExponential() doesn't return a string containing 'e', which
1905 // should never happen.
1910 * Add ticks when the x axis has numbers on it (instead of dates)
1911 * @param {Number} startDate Start of the date window (millis since epoch)
1912 * @param {Number} endDate End of the date window (millis since epoch)
1914 * @param {function} attribute accessor function.
1915 * @return {Array.<Object>} Array of {label, value} tuples.
1918 Dygraph
.numericTicks
= function(minV
, maxV
, self
, axis_props
, vals
) {
1919 var attr
= function(k
) {
1920 if (axis_props
&& axis_props
.hasOwnProperty(k
)) return axis_props
[k
];
1921 return self
.attr_(k
);
1926 for (var i
= 0; i
< vals
.length
; i
++) {
1927 ticks
[i
].push({v
: vals
[i
]});
1931 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1932 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1933 // The first spacing greater than pixelsPerYLabel is what we use.
1934 // TODO(danvk): version that works on a log scale.
1935 if (attr("labelsKMG2")) {
1936 var mults
= [1, 2, 4, 8];
1938 var mults
= [1, 2, 5];
1940 var scale
, low_val
, high_val
, nTicks
;
1941 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1942 var pixelsPerTick
= attr('pixelsPerYLabel');
1943 for (var i
= -10; i
< 50; i
++) {
1944 if (attr("labelsKMG2")) {
1945 var base_scale
= Math
.pow(16, i
);
1947 var base_scale
= Math
.pow(10, i
);
1949 for (var j
= 0; j
< mults
.length
; j
++) {
1950 scale
= base_scale
* mults
[j
];
1951 low_val
= Math
.floor(minV
/ scale
) * scale
;
1952 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1953 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
1954 var spacing
= self
.height_
/ nTicks
;
1955 // wish I could break out of both loops at once...
1956 if (spacing
> pixelsPerTick
) break;
1958 if (spacing
> pixelsPerTick
) break;
1961 // Construct the set of ticks.
1962 // Allow reverse y-axis if it's explicitly requested.
1963 if (low_val
> high_val
) scale
*= -1;
1964 for (var i
= 0; i
< nTicks
; i
++) {
1965 var tickV
= low_val
+ i
* scale
;
1966 ticks
.push( {v
: tickV
} );
1970 // Add formatted labels to the ticks.
1973 if (attr("labelsKMB")) {
1975 k_labels
= [ "K", "M", "B", "T" ];
1977 if (attr("labelsKMG2")) {
1978 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1980 k_labels
= [ "k", "M", "G", "T" ];
1982 var formatter
= attr('yAxisLabelFormatter') ?
1983 attr('yAxisLabelFormatter') : attr('yValueFormatter');
1985 // Determine the number of decimal places needed for the labels below by
1986 // taking the maximum number of significant figures for any label. We must
1987 // take the max because we can't tell if trailing 0s are significant.
1989 for (var i
= 0; i
< ticks
.length
; i
++) {
1990 numDigits
= Math
.max(Dygraph
.significantFigures(ticks
[i
].v
), numDigits
);
1993 for (var i
= 0; i
< ticks
.length
; i
++) {
1994 var tickV
= ticks
[i
].v
;
1995 var absTickV
= Math
.abs(tickV
);
1996 var label
= (formatter
!== undefined
) ?
1997 formatter(tickV
, numDigits
) : tickV
.toPrecision(numDigits
);
1998 if (k_labels
.length
> 0) {
1999 // Round up to an appropriate unit.
2001 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
2002 if (absTickV
>= n
) {
2003 label
= (tickV
/ n
).toPrecision(numDigits
) + k_labels
[j
];
2008 ticks
[i
].label
= label
;
2010 return {ticks
: ticks
, numDigits
: numDigits
};
2013 // Computes the range of the data series (including confidence intervals).
2014 // series is either [ [x1, y1], [x2, y2], ... ] or
2015 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2016 // Returns [low, high]
2017 Dygraph
.prototype.extremeValues_
= function(series
) {
2018 var minY
= null, maxY
= null;
2020 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2022 // With custom bars, maxY is the max of the high values.
2023 for (var j
= 0; j
< series
.length
; j
++) {
2024 var y
= series
[j
][1][0];
2026 var low
= y
- series
[j
][1][1];
2027 var high
= y
+ series
[j
][1][2];
2028 if (low
> y
) low
= y
; // this can happen with custom bars,
2029 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2030 if (maxY
== null || high
> maxY
) {
2033 if (minY
== null || low
< minY
) {
2038 for (var j
= 0; j
< series
.length
; j
++) {
2039 var y
= series
[j
][1];
2040 if (y
=== null || isNaN(y
)) continue;
2041 if (maxY
== null || y
> maxY
) {
2044 if (minY
== null || y
< minY
) {
2050 return [minY
, maxY
];
2054 * This function is called once when the chart's data is changed or the options
2055 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2056 * idea is that values derived from the chart's data can be computed here,
2057 * rather than every time the chart is drawn. This includes things like the
2058 * number of axes, rolling averages, etc.
2060 Dygraph
.prototype.predraw_
= function() {
2061 // TODO(danvk): move more computations out of drawGraph_ and into here.
2062 this.computeYAxes_();
2064 // Create a new plotter.
2065 if (this.plotter_
) this.plotter_
.clear();
2066 this.plotter_
= new DygraphCanvasRenderer(this,
2067 this.hidden_
, this.layout_
,
2068 this.renderOptions_
);
2070 // The roller sits in the bottom left corner of the chart. We don't know where
2071 // this will be until the options are available, so it's positioned here.
2072 this.createRollInterface_();
2074 // Same thing applies for the labelsDiv. It's right edge should be flush with
2075 // the right edge of the charting area (which may not be the same as the right
2076 // edge of the div, if we have two y-axes.
2077 this.positionLabelsDiv_();
2079 // If the data or options have changed, then we'd better redraw.
2085 * Update the graph with new data. This method is called when the viewing area
2086 * has changed. If the underlying data or options have changed, predraw_ will
2087 * be called before drawGraph_ is called.
2090 Dygraph
.prototype.drawGraph_
= function() {
2091 var data
= this.rawData_
;
2093 // This is used to set the second parameter to drawCallback, below.
2094 var is_initial_draw
= this.is_initial_draw_
;
2095 this.is_initial_draw_
= false;
2097 var minY
= null, maxY
= null;
2098 this.layout_
.removeAllDatasets();
2100 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
2102 // Loop over the fields (series). Go from the last to the first,
2103 // because if they're stacked that's how we accumulate the values.
2105 var cumulative_y
= []; // For stacked series.
2108 var extremes
= {}; // series name -> [low, high]
2110 // Loop over all fields and create datasets
2111 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
2112 if (!this.visibility()[i
- 1]) continue;
2114 var seriesName
= this.attr_("labels")[i
];
2115 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
2118 for (var j
= 0; j
< data
.length
; j
++) {
2119 if (data
[j
][i
] != null || !connectSeparatedPoints
) {
2120 var date
= data
[j
][0];
2121 series
.push([date
, data
[j
][i
]]);
2125 // TODO(danvk): move this into predraw_. It's insane to do it here.
2126 series
= this.rollingAverage(series
, this.rollPeriod_
);
2128 // Prune down to the desired range, if necessary (for zooming)
2129 // Because there can be lines going to points outside of the visible area,
2130 // we actually prune to visible points, plus one on either side.
2131 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2132 if (this.dateWindow_
) {
2133 var low
= this.dateWindow_
[0];
2134 var high
= this.dateWindow_
[1];
2136 // TODO(danvk): do binary search instead of linear search.
2137 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2138 var firstIdx
= null, lastIdx
= null;
2139 for (var k
= 0; k
< series
.length
; k
++) {
2140 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2143 if (series
[k
][0] <= high
) {
2147 if (firstIdx
=== null) firstIdx
= 0;
2148 if (firstIdx
> 0) firstIdx
--;
2149 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2150 if (lastIdx
< series
.length
- 1) lastIdx
++;
2151 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
2152 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
2153 pruned
.push(series
[k
]);
2157 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
2160 var seriesExtremes
= this.extremeValues_(series
);
2163 for (var j
=0; j
<series
.length
; j
++) {
2164 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
2167 } else if (this.attr_("stackedGraph")) {
2168 var l
= series
.length
;
2170 for (var j
= 0; j
< l
; j
++) {
2171 // If one data set has a NaN, let all subsequent stacked
2172 // sets inherit the NaN -- only start at 0 for the first set.
2173 var x
= series
[j
][0];
2174 if (cumulative_y
[x
] === undefined
) {
2175 cumulative_y
[x
] = 0;
2178 actual_y
= series
[j
][1];
2179 cumulative_y
[x
] += actual_y
;
2181 series
[j
] = [x
, cumulative_y
[x
]]
2183 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2184 seriesExtremes
[1] = cumulative_y
[x
];
2186 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2187 seriesExtremes
[0] = cumulative_y
[x
];
2191 extremes
[seriesName
] = seriesExtremes
;
2193 datasets
[i
] = series
;
2196 for (var i
= 1; i
< datasets
.length
; i
++) {
2197 if (!this.visibility()[i
- 1]) continue;
2198 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
2201 // TODO(danvk): this method doesn't need to return anything.
2202 var out
= this.computeYAxisRanges_(extremes
);
2204 var seriesToAxisMap
= out
[1];
2205 this.layout_
.updateOptions( { yAxes
: axes
,
2206 seriesToAxisMap
: seriesToAxisMap
2211 // Tell PlotKit to use this new data and render itself
2212 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
2213 this.layout_
.evaluateWithError();
2214 this.plotter_
.clear();
2215 this.plotter_
.render();
2216 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2217 this.canvas_
.height
);
2219 if (this.attr_("drawCallback") !== null) {
2220 this.attr_("drawCallback")(this, is_initial_draw
);
2225 * Determine properties of the y-axes which are independent of the data
2226 * currently being displayed. This includes things like the number of axes and
2227 * the style of the axes. It does not include the range of each axis and its
2229 * This fills in this.axes_ and this.seriesToAxisMap_.
2230 * axes_ = [ { options } ]
2231 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2232 * indices are into the axes_ array.
2234 Dygraph
.prototype.computeYAxes_
= function() {
2235 this.axes_
= [{}]; // always have at least one y-axis.
2236 this.seriesToAxisMap_
= {};
2238 // Get a list of series names.
2239 var labels
= this.attr_("labels");
2241 for (var i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2243 // all options which could be applied per-axis:
2251 'axisLabelFontSize',
2255 // Copy global axis options over to the first axis.
2256 for (var i
= 0; i
< axisOptions
.length
; i
++) {
2257 var k
= axisOptions
[i
];
2258 var v
= this.attr_(k
);
2259 if (v
) this.axes_
[0][k
] = v
;
2262 // Go through once and add all the axes.
2263 for (var seriesName
in series
) {
2264 if (!series
.hasOwnProperty(seriesName
)) continue;
2265 var axis
= this.attr_("axis", seriesName
);
2267 this.seriesToAxisMap_
[seriesName
] = 0;
2270 if (typeof(axis
) == 'object') {
2271 // Add a new axis, making a copy of its per-axis options.
2273 Dygraph
.update(opts
, this.axes_
[0]);
2274 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2275 Dygraph
.update(opts
, axis
);
2276 this.axes_
.push(opts
);
2277 this.seriesToAxisMap_
[seriesName
] = this.axes_
.length
- 1;
2281 // Go through one more time and assign series to an axis defined by another
2282 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2283 for (var seriesName
in series
) {
2284 if (!series
.hasOwnProperty(seriesName
)) continue;
2285 var axis
= this.attr_("axis", seriesName
);
2286 if (typeof(axis
) == 'string') {
2287 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2288 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2289 "series " + axis
+ ", which does not define its own axis.");
2292 var idx
= this.seriesToAxisMap_
[axis
];
2293 this.seriesToAxisMap_
[seriesName
] = idx
;
2297 // Now we remove series from seriesToAxisMap_ which are not visible. We do
2298 // this last so that hiding the first series doesn't destroy the axis
2299 // properties of the primary axis.
2300 var seriesToAxisFiltered
= {};
2301 var vis
= this.visibility();
2302 for (var i
= 1; i
< labels
.length
; i
++) {
2304 if (vis
[i
- 1]) seriesToAxisFiltered
[s
] = this.seriesToAxisMap_
[s
];
2306 this.seriesToAxisMap_
= seriesToAxisFiltered
;
2310 * Returns the number of y-axes on the chart.
2311 * @return {Number} the number of axes.
2313 Dygraph
.prototype.numAxes
= function() {
2315 for (var series
in this.seriesToAxisMap_
) {
2316 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2317 var idx
= this.seriesToAxisMap_
[series
];
2318 if (idx
> last_axis
) last_axis
= idx
;
2320 return 1 + last_axis
;
2324 * Determine the value range and tick marks for each axis.
2325 * @param {Object} extremes A mapping from seriesName -> [low, high]
2326 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2328 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2329 // Build a map from axis number -> [list of series names]
2330 var seriesForAxis
= [];
2331 for (var series
in this.seriesToAxisMap_
) {
2332 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2333 var idx
= this.seriesToAxisMap_
[series
];
2334 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2335 seriesForAxis
[idx
].push(series
);
2338 // Compute extreme values, a span and tick marks for each axis.
2339 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2340 var axis
= this.axes_
[i
];
2341 if (axis
.valueWindow
) {
2342 // This is only set if the user has zoomed on the y-axis. It is never set
2343 // by a user. It takes precedence over axis.valueRange because, if you set
2344 // valueRange, you'd still expect to be able to pan.
2345 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2346 } else if (axis
.valueRange
) {
2347 // This is a user-set value range for this axis.
2348 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2350 // Calculate the extremes of extremes.
2351 var series
= seriesForAxis
[i
];
2352 var minY
= Infinity
; // extremes[series[0]][0];
2353 var maxY
= -Infinity
; // extremes[series[0]][1];
2354 for (var j
= 0; j
< series
.length
; j
++) {
2355 minY
= Math
.min(extremes
[series
[j
]][0], minY
);
2356 maxY
= Math
.max(extremes
[series
[j
]][1], maxY
);
2358 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2360 // Add some padding and round up to an integer to be human-friendly.
2361 var span
= maxY
- minY
;
2362 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2363 if (span
== 0) { span
= maxY
; }
2364 var maxAxisY
= maxY
+ 0.1 * span
;
2365 var minAxisY
= minY
- 0.1 * span
;
2367 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2368 if (!this.attr_("avoidMinZero")) {
2369 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2370 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2373 if (this.attr_("includeZero")) {
2374 if (maxY
< 0) maxAxisY
= 0;
2375 if (minY
> 0) minAxisY
= 0;
2378 axis
.computedValueRange
= [minAxisY
, maxAxisY
];
2381 // Add ticks. By default, all axes inherit the tick positions of the
2382 // primary axis. However, if an axis is specifically marked as having
2383 // independent ticks, then that is permissible as well.
2384 if (i
== 0 || axis
.independentTicks
) {
2386 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2387 axis
.computedValueRange
[1],
2390 axis
.ticks
= ret
.ticks
;
2391 this.numYDigits_
= ret
.numDigits
;
2393 var p_axis
= this.axes_
[0];
2394 var p_ticks
= p_axis
.ticks
;
2395 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2396 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2397 var tick_values
= [];
2398 for (var i
= 0; i
< p_ticks
.length
; i
++) {
2399 var y_frac
= (p_ticks
[i
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2400 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2401 tick_values
.push(y_val
);
2405 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2406 axis
.computedValueRange
[1],
2407 this, axis
, tick_values
);
2408 axis
.ticks
= ret
.ticks
;
2409 this.numYDigits_
= ret
.numDigits
;
2413 return [this.axes_
, this.seriesToAxisMap_
];
2417 * Calculates the rolling average of a data set.
2418 * If originalData is [label, val], rolls the average of those.
2419 * If originalData is [label, [, it's interpreted as [value, stddev]
2420 * and the roll is returned in the same form, with appropriately reduced
2421 * stddev for each value.
2422 * Note that this is where fractional input (i.e. '5/10') is converted into
2424 * @param {Array} originalData The data in the appropriate format (see above)
2425 * @param {Number} rollPeriod The number of days over which to average the data
2427 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2428 if (originalData
.length
< 2)
2429 return originalData
;
2430 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
2431 var rollingData
= [];
2432 var sigma
= this.attr_("sigma");
2434 if (this.fractions_
) {
2436 var den
= 0; // numerator/denominator
2438 for (var i
= 0; i
< originalData
.length
; i
++) {
2439 num
+= originalData
[i
][1][0];
2440 den
+= originalData
[i
][1][1];
2441 if (i
- rollPeriod
>= 0) {
2442 num
-= originalData
[i
- rollPeriod
][1][0];
2443 den
-= originalData
[i
- rollPeriod
][1][1];
2446 var date
= originalData
[i
][0];
2447 var value
= den
? num
/ den
: 0.0;
2448 if (this.attr_("errorBars")) {
2449 if (this.wilsonInterval_
) {
2450 // For more details on this confidence interval, see:
2451 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2453 var p
= value
< 0 ? 0 : value
, n
= den
;
2454 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2455 var denom
= 1 + sigma
* sigma
/ den
;
2456 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2457 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2458 rollingData
[i
] = [date
,
2459 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2461 rollingData
[i
] = [date
, [0, 0, 0]];
2464 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2465 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2468 rollingData
[i
] = [date
, mult
* value
];
2471 } else if (this.attr_("customBars")) {
2476 for (var i
= 0; i
< originalData
.length
; i
++) {
2477 var data
= originalData
[i
][1];
2479 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2481 if (y
!= null && !isNaN(y
)) {
2487 if (i
- rollPeriod
>= 0) {
2488 var prev
= originalData
[i
- rollPeriod
];
2489 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
2496 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2497 1.0 * (mid
- low
) / count
,
2498 1.0 * (high
- mid
) / count
]];
2501 // Calculate the rolling average for the first rollPeriod - 1 points where
2502 // there is not enough data to roll over the full number of days
2503 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
2504 if (!this.attr_("errorBars")){
2505 if (rollPeriod
== 1) {
2506 return originalData
;
2509 for (var i
= 0; i
< originalData
.length
; i
++) {
2512 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2513 var y
= originalData
[j
][1];
2514 if (y
== null || isNaN(y
)) continue;
2516 sum
+= originalData
[j
][1];
2519 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2521 rollingData
[i
] = [originalData
[i
][0], null];
2526 for (var i
= 0; i
< originalData
.length
; i
++) {
2530 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2531 var y
= originalData
[j
][1][0];
2532 if (y
== null || isNaN(y
)) continue;
2534 sum
+= originalData
[j
][1][0];
2535 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2538 var stddev
= Math
.sqrt(variance
) / num_ok
;
2539 rollingData
[i
] = [originalData
[i
][0],
2540 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2542 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2552 * Parses a date, returning the number of milliseconds since epoch. This can be
2553 * passed in as an xValueParser in the Dygraph constructor.
2554 * TODO(danvk): enumerate formats that this understands.
2555 * @param {String} A date in YYYYMMDD format.
2556 * @return {Number} Milliseconds since epoch.
2559 Dygraph
.dateParser
= function(dateStr
, self
) {
2562 if (dateStr
.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12'
2563 dateStrSlashed
= dateStr
.replace("-", "/", "g");
2564 while (dateStrSlashed
.search("-") != -1) {
2565 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
2567 d
= Date
.parse(dateStrSlashed
);
2568 } else if (dateStr
.length
== 8) { // e.g. '20090712'
2569 // TODO(danvk): remove support for this format. It's confusing.
2570 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
2571 + "/" + dateStr
.substr(6,2);
2572 d
= Date
.parse(dateStrSlashed
);
2574 // Any format that Date.parse will accept, e.g. "2009/07/12" or
2575 // "2009/07/12 12:34:56"
2576 d
= Date
.parse(dateStr
);
2579 if (!d
|| isNaN(d
)) {
2580 self
.error("Couldn't parse " + dateStr
+ " as a date");
2586 * Detects the type of the str (date or numeric) and sets the various
2587 * formatting attributes in this.attrs_ based on this type.
2588 * @param {String} str An x value.
2591 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2593 if (str
.indexOf('-') >= 0 ||
2594 str
.indexOf('/') >= 0 ||
2595 isNaN(parseFloat(str
))) {
2597 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2598 // TODO(danvk): remove support for this format.
2603 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2604 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2605 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2606 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2608 this.attrs_
.xValueFormatter
= this.attrs_
.yValueFormatter
;
2609 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2610 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2611 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2616 * Parses a string in a special csv format. We expect a csv file where each
2617 * line is a date point, and the first field in each line is the date string.
2618 * We also expect that all remaining fields represent series.
2619 * if the errorBars attribute is set, then interpret the fields as:
2620 * date, series1, stddev1, series2, stddev2, ...
2621 * @param {Array.<Object>} data See above.
2624 * @return Array.<Object> An array with one entry for each row. These entries
2625 * are an array of cells in that row. The first entry is the parsed x-value for
2626 * the row. The second, third, etc. are the y-values. These can take on one of
2627 * three forms, depending on the CSV and constructor parameters:
2629 * 2. [ value, stddev ]
2630 * 3. [ low value, center value, high value ]
2632 Dygraph
.prototype.parseCSV_
= function(data
) {
2634 var lines
= data
.split("\n");
2636 // Use the default delimiter or fall back to a tab if that makes sense.
2637 var delim
= this.attr_('delimiter');
2638 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2643 if (this.labelsFromCSV_
) {
2645 this.attrs_
.labels
= lines
[0].split(delim
);
2648 // Parse the x as a float or return null if it's not a number.
2649 var parseFloatOrNull
= function(x
) {
2650 var val
= parseFloat(x
);
2651 // isFinite() returns false for NaN and +/-Infinity
.
2652 return isFinite(val
) ? val
: null;
2656 var defaultParserSet
= false; // attempt to auto-detect x value type
2657 var expectedCols
= this.attr_("labels").length
;
2658 var outOfOrder
= false;
2659 for (var i
= start
; i
< lines
.length
; i
++) {
2660 var line
= lines
[i
];
2661 if (line
.length
== 0) continue; // skip blank lines
2662 if (line
[0] == '#') continue; // skip comment lines
2663 var inFields
= line
.split(delim
);
2664 if (inFields
.length
< 2) continue;
2667 if (!defaultParserSet
) {
2668 this.detectTypeFromString_(inFields
[0]);
2669 xParser
= this.attr_("xValueParser");
2670 defaultParserSet
= true;
2672 fields
[0] = xParser(inFields
[0], this);
2674 // If fractions are expected, parse the numbers as "A/B
"
2675 if (this.fractions_) {
2676 for (var j = 1; j < inFields.length; j++) {
2677 // TODO(danvk): figure out an appropriate way to flag parse errors.
2678 var vals = inFields[j].split("/");
2679 fields[j] = [parseFloatOrNull(vals[0]), parseFloatOrNull(vals[1])];
2681 } else if (this.attr_("errorBars
")) {
2682 // If there are error bars, values are (value, stddev) pairs
2683 for (var j = 1; j < inFields.length; j += 2)
2684 fields[(j + 1) / 2] = [parseFloatOrNull(inFields[j]),
2685 parseFloatOrNull(inFields[j + 1])];
2686 } else if (this.attr_("customBars
")) {
2687 // Bars are a low;center;high tuple
2688 for (var j = 1; j < inFields.length; j++) {
2689 var vals = inFields[j].split(";");
2690 fields[j] = [ parseFloatOrNull(vals[0]),
2691 parseFloatOrNull(vals[1]),
2692 parseFloatOrNull(vals[2]) ];
2695 // Values are just numbers
2696 for (var j = 1; j < inFields.length; j++) {
2697 fields[j] = parseFloatOrNull(inFields[j]);
2700 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2705 if (fields.length != expectedCols) {
2706 this.error("Number of columns
in line
" + i + " (" + fields.length +
2707 ") does not agree
with number of
labels (" + expectedCols +
2713 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2714 ret.sort(function(a,b) { return a[0] - b[0] });
2721 * The user has provided their data as a pre-packaged JS array. If the x values
2722 * are numeric, this is the same as dygraphs' internal format. If the x values
2723 * are dates, we need to convert them from Date objects to ms since epoch.
2724 * @param {Array.<Object>} data
2725 * @return {Array.<Object>} data with numeric x values.
2727 Dygraph.prototype.parseArray_ = function(data) {
2728 // Peek at the first x value to see if it's numeric.
2729 if (data.length == 0) {
2730 this.error("Can
't plot empty data set");
2733 if (data[0].length == 0) {
2734 this.error("Data set cannot contain an empty row");
2738 if (this.attr_("labels") == null) {
2739 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2740 "in the options parameter");
2741 this.attrs_.labels = [ "X" ];
2742 for (var i = 1; i < data[0].length; i++) {
2743 this.attrs_.labels.push("Y" + i);
2747 if (Dygraph.isDateLike(data[0][0])) {
2748 // Some intelligent defaults for a date x-axis.
2749 this.attrs_.xValueFormatter = Dygraph.dateString_;
2750 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
2751 this.attrs_.xTicker = Dygraph.dateTicker;
2753 // Assume they're all dates
.
2754 var parsedData
= Dygraph
.clone(data
);
2755 for (var i
= 0; i
< data
.length
; i
++) {
2756 if (parsedData
[i
].length
== 0) {
2757 this.error("Row " + (1 + i
) + " of data is empty");
2760 if (parsedData
[i
][0] == null
2761 || typeof(parsedData
[i
][0].getTime
) != 'function'
2762 || isNaN(parsedData
[i
][0].getTime())) {
2763 this.error("x value in row " + (1 + i
) + " is not a Date");
2766 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2770 // Some intelligent defaults for a numeric x-axis.
2771 this.attrs_
.xValueFormatter
= this.attrs_
.yValueFormatter
;
2772 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2778 * Parses a DataTable object from gviz.
2779 * The data is expected to have a first column that is either a date or a
2780 * number. All subsequent columns must be numbers. If there is a clear mismatch
2781 * between this.xValueParser_ and the type of the first column, it will be
2782 * fixed. Fills out rawData_.
2783 * @param {Array.<Object>} data See above.
2786 Dygraph
.prototype.parseDataTable_
= function(data
) {
2787 var cols
= data
.getNumberOfColumns();
2788 var rows
= data
.getNumberOfRows();
2790 var indepType
= data
.getColumnType(0);
2791 if (indepType
== 'date' || indepType
== 'datetime') {
2792 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2793 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2794 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2795 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2796 } else if (indepType
== 'number') {
2797 this.attrs_
.xValueFormatter
= this.attrs_
.yValueFormatter
;
2798 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2799 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2800 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2802 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2803 "column 1 of DataTable input (Got '" + indepType
+ "')");
2807 // Array of the column indices which contain data (and not annotations).
2809 var annotationCols
= {}; // data index -> [annotation cols]
2810 var hasAnnotations
= false;
2811 for (var i
= 1; i
< cols
; i
++) {
2812 var type
= data
.getColumnType(i
);
2813 if (type
== 'number') {
2815 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2816 // This is OK -- it's an annotation column.
2817 var dataIdx
= colIdx
[colIdx
.length
- 1];
2818 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2819 annotationCols
[dataIdx
] = [i
];
2821 annotationCols
[dataIdx
].push(i
);
2823 hasAnnotations
= true;
2825 this.error("Only 'number' is supported as a dependent type with Gviz." +
2826 " 'string' is only supported if displayAnnotations is true");
2830 // Read column labels
2831 // TODO(danvk): add support back for errorBars
2832 var labels
= [data
.getColumnLabel(0)];
2833 for (var i
= 0; i
< colIdx
.length
; i
++) {
2834 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2835 if (this.attr_("errorBars")) i
+= 1;
2837 this.attrs_
.labels
= labels
;
2838 cols
= labels
.length
;
2841 var outOfOrder
= false;
2842 var annotations
= [];
2843 for (var i
= 0; i
< rows
; i
++) {
2845 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2846 data
.getValue(i
, 0) === null) {
2847 this.warn("Ignoring row " + i
+
2848 " of DataTable because of undefined or null first column.");
2852 if (indepType
== 'date' || indepType
== 'datetime') {
2853 row
.push(data
.getValue(i
, 0).getTime());
2855 row
.push(data
.getValue(i
, 0));
2857 if (!this.attr_("errorBars")) {
2858 for (var j
= 0; j
< colIdx
.length
; j
++) {
2859 var col
= colIdx
[j
];
2860 row
.push(data
.getValue(i
, col
));
2861 if (hasAnnotations
&&
2862 annotationCols
.hasOwnProperty(col
) &&
2863 data
.getValue(i
, annotationCols
[col
][0]) != null) {
2865 ann
.series
= data
.getColumnLabel(col
);
2867 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
2869 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2870 if (k
) ann
.text
+= "\n";
2871 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2873 annotations
.push(ann
);
2877 for (var j
= 0; j
< cols
- 1; j
++) {
2878 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2881 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2885 // Strip out infinities, which give dygraphs problems later on.
2886 for (var j
= 0; j
< row
.length
; j
++) {
2887 if (!isFinite(row
[j
])) row
[j
] = null;
2893 this.warn("DataTable is out of order; order it correctly to speed loading.");
2894 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
2896 this.rawData_
= ret
;
2898 if (annotations
.length
> 0) {
2899 this.setAnnotations(annotations
, true);
2903 // These functions are all based on MochiKit.
2904 Dygraph
.update
= function (self
, o
) {
2905 if (typeof(o
) != 'undefined' && o
!== null) {
2907 if (o
.hasOwnProperty(k
)) {
2915 Dygraph
.isArrayLike
= function (o
) {
2916 var typ
= typeof(o
);
2918 (typ
!= 'object' && !(typ
== 'function' &&
2919 typeof(o
.item
) == 'function')) ||
2921 typeof(o
.length
) != 'number' ||
2929 Dygraph
.isDateLike
= function (o
) {
2930 if (typeof(o
) != "object" || o
=== null ||
2931 typeof(o
.getTime
) != 'function') {
2937 Dygraph
.clone
= function(o
) {
2938 // TODO(danvk): figure out how MochiKit's version works
2940 for (var i
= 0; i
< o
.length
; i
++) {
2941 if (Dygraph
.isArrayLike(o
[i
])) {
2942 r
.push(Dygraph
.clone(o
[i
]));
2952 * Get the CSV data. If it's in a function, call that function. If it's in a
2953 * file, do an XMLHttpRequest to get it.
2956 Dygraph
.prototype.start_
= function() {
2957 if (typeof this.file_
== 'function') {
2958 // CSV string. Pretend we got it via XHR.
2959 this.loadedEvent_(this.file_());
2960 } else if (Dygraph
.isArrayLike(this.file_
)) {
2961 this.rawData_
= this.parseArray_(this.file_
);
2963 } else if (typeof this.file_
== 'object' &&
2964 typeof this.file_
.getColumnRange
== 'function') {
2965 // must be a DataTable from gviz.
2966 this.parseDataTable_(this.file_
);
2968 } else if (typeof this.file_
== 'string') {
2969 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2970 if (this.file_
.indexOf('\n') >= 0) {
2971 this.loadedEvent_(this.file_
);
2973 var req
= new XMLHttpRequest();
2975 req
.onreadystatechange
= function () {
2976 if (req
.readyState
== 4) {
2977 if (req
.status
== 200) {
2978 caller
.loadedEvent_(req
.responseText
);
2983 req
.open("GET", this.file_
, true);
2987 this.error("Unknown data format: " + (typeof this.file_
));
2992 * Changes various properties of the graph. These can include:
2994 * <li>file: changes the source data for the graph</li>
2995 * <li>errorBars: changes whether the data contains stddev</li>
2997 * @param {Object} attrs The new properties and values
2999 Dygraph
.prototype.updateOptions
= function(attrs
) {
3000 // TODO(danvk): this is a mess. Rethink this function.
3001 if ('rollPeriod' in attrs
) {
3002 this.rollPeriod_
= attrs
.rollPeriod
;
3004 if ('dateWindow' in attrs
) {
3005 this.dateWindow_
= attrs
.dateWindow
;
3008 // TODO(danvk): validate per-series options.
3013 // highlightCircleSize
3015 Dygraph
.update(this.user_attrs_
, attrs
);
3016 Dygraph
.update(this.renderOptions_
, attrs
);
3018 this.labelsFromCSV_
= (this.attr_("labels") == null);
3020 // TODO(danvk): this doesn't match the constructor logic
3021 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
3022 if (attrs
['file']) {
3023 this.file_
= attrs
['file'];
3031 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3032 * containing div (which has presumably changed size since the dygraph was
3033 * instantiated. If the width/height are specified, the div will be resized.
3035 * This is far more efficient than destroying and re-instantiating a
3036 * Dygraph, since it doesn't have to reparse the underlying data.
3038 * @param {Number} width Width (in pixels)
3039 * @param {Number} height Height (in pixels)
3041 Dygraph
.prototype.resize
= function(width
, height
) {
3042 if (this.resize_lock
) {
3045 this.resize_lock
= true;
3047 if ((width
=== null) != (height
=== null)) {
3048 this.warn("Dygraph.resize() should be called with zero parameters or " +
3049 "two non-NULL parameters. Pretending it was zero.");
3050 width
= height
= null;
3053 // TODO(danvk): there should be a clear() method.
3054 this.maindiv_
.innerHTML
= "";
3055 this.attrs_
.labelsDiv
= null;
3058 this.maindiv_
.style
.width
= width
+ "px";
3059 this.maindiv_
.style
.height
= height
+ "px";
3060 this.width_
= width
;
3061 this.height_
= height
;
3063 this.width_
= this.maindiv_
.offsetWidth
;
3064 this.height_
= this.maindiv_
.offsetHeight
;
3067 this.createInterface_();
3070 this.resize_lock
= false;
3074 * Adjusts the number of days in the rolling average. Updates the graph to
3075 * reflect the new averaging period.
3076 * @param {Number} length Number of days over which to average the data.
3078 Dygraph
.prototype.adjustRoll
= function(length
) {
3079 this.rollPeriod_
= length
;
3084 * Returns a boolean array of visibility statuses.
3086 Dygraph
.prototype.visibility
= function() {
3087 // Do lazy-initialization, so that this happens after we know the number of
3089 if (!this.attr_("visibility")) {
3090 this.attrs_
["visibility"] = [];
3092 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
3093 this.attr_("visibility").push(true);
3095 return this.attr_("visibility");
3099 * Changes the visiblity of a series.
3101 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3102 var x
= this.visibility();
3103 if (num
< 0 || num
>= x
.length
) {
3104 this.warn("invalid series number in setVisibility: " + num
);
3112 * Update the list of annotations and redraw the chart.
3114 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3115 // Only add the annotation CSS rule once we know it will be used.
3116 Dygraph
.addAnnotationRule();
3117 this.annotations_
= ann
;
3118 this.layout_
.setAnnotations(this.annotations_
);
3119 if (!suppressDraw
) {
3125 * Return the list of annotations.
3127 Dygraph
.prototype.annotations
= function() {
3128 return this.annotations_
;
3132 * Get the index of a series (column) given its name. The first column is the
3133 * x-axis, so the data series start with index 1.
3135 Dygraph
.prototype.indexFromSetName
= function(name
) {
3136 var labels
= this.attr_("labels");
3137 for (var i
= 0; i
< labels
.length
; i
++) {
3138 if (labels
[i
] == name
) return i
;
3143 Dygraph
.addAnnotationRule
= function() {
3144 if (Dygraph
.addedAnnotationCSS
) return;
3146 var rule
= "border: 1px solid black; " +
3147 "background-color: white; " +
3148 "text-align: center;";
3150 var styleSheetElement
= document
.createElement("style");
3151 styleSheetElement
.type
= "text/css";
3152 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3154 // Find the first style sheet that we can access.
3155 // We may not add a rule to a style sheet from another domain for security
3156 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3157 // adds its own style sheets from google.com.
3158 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3159 if (document
.styleSheets
[i
].disabled
) continue;
3160 var mysheet
= document
.styleSheets
[i
];
3162 if (mysheet
.insertRule
) { // Firefox
3163 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3164 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3165 } else if (mysheet
.addRule
) { // IE
3166 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3168 Dygraph
.addedAnnotationCSS
= true;
3171 // Was likely a security exception.
3175 this.warn("Unable to add default annotation CSS rule; display may be off.");
3179 * Create a new canvas element. This is more complex than a simple
3180 * document.createElement("canvas") because of IE and excanvas.
3182 Dygraph
.createCanvas
= function() {
3183 var canvas
= document
.createElement("canvas");
3185 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
3186 if (isIE
&& (typeof(G_vmlCanvasManager
) != 'undefined')) {
3187 canvas
= G_vmlCanvasManager
.initElement(canvas
);
3195 * A wrapper around Dygraph that implements the gviz API.
3196 * @param {Object} container The DOM object the visualization should live in.
3198 Dygraph
.GVizChart
= function(container
) {
3199 this.container
= container
;
3202 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
3203 // Clear out any existing dygraph.
3204 // TODO(danvk): would it make more sense to simply redraw using the current
3205 // date_graph object?
3206 this.container
.innerHTML
= '';
3207 if (typeof(this.date_graph
) != 'undefined') {
3208 this.date_graph
.destroy();
3211 this.date_graph
= new Dygraph(this.container
, data
, options
);
3215 * Google charts compatible setSelection
3216 * Only row selection is supported, all points in the row will be highlighted
3217 * @param {Array} array of the selected cells
3220 Dygraph
.GVizChart
.prototype.setSelection
= function(selection_array
) {
3222 if (selection_array
.length
) {
3223 row
= selection_array
[0].row
;
3225 this.date_graph
.setSelection(row
);
3229 * Google charts compatible getSelection implementation
3230 * @return {Array} array of the selected cells
3233 Dygraph
.GVizChart
.prototype.getSelection
= function() {
3236 var row
= this.date_graph
.getSelection();
3238 if (row
< 0) return selection
;
3241 for (var i
in this.date_graph
.layout_
.datasets
) {
3242 selection
.push({row
: row
, column
: col
});
3249 // Older pages may still use this name.
3250 DateGraph
= Dygraph
;