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://www.danvk.org/dygraphs
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__();
76 // Various default values
77 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
78 Dygraph
.DEFAULT_WIDTH
= 480;
79 Dygraph
.DEFAULT_HEIGHT
= 320;
80 Dygraph
.AXIS_LINE_WIDTH
= 0.3;
82 // Default attribute values.
83 Dygraph
.DEFAULT_ATTRS
= {
84 highlightCircleSize
: 3,
90 // TODO(danvk): move defaults from createStatusMessage_ here.
92 labelsSeparateLines
: false,
93 labelsShowZeroValues
: true,
96 showLabelsOnHighlight
: true,
98 yValueFormatter
: function(x
) { return Dygraph
.round_(x
, 2); },
103 axisLabelFontSize
: 14,
106 xAxisLabelFormatter
: Dygraph
.dateAxisFormatter
,
110 xValueFormatter
: Dygraph
.dateString_
,
111 xValueParser
: Dygraph
.dateParser
,
112 xTicker
: Dygraph
.dateTicker
,
120 wilsonInterval
: true, // only relevant if fractions is true
124 connectSeparatedPoints
: false,
127 hideOverlayOnMouseOut
: true,
133 // Various logging levels.
139 // Directions for panning and zooming. Use bit operations when combined
140 // values are possible.
141 Dygraph
.HORIZONTAL
= 1;
142 Dygraph
.VERTICAL
= 2;
144 // Used for initializing annotation CSS rules only once.
145 Dygraph
.addedAnnotationCSS
= false;
147 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
148 // Labels is no longer a constructor parameter, since it's typically set
149 // directly from the data source. It also conains a name for the x-axis,
150 // which the previous constructor form did not.
151 if (labels
!= null) {
152 var new_labels
= ["Date"];
153 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
154 Dygraph
.update(attrs
, { 'labels': new_labels
});
156 this.__init__(div
, file
, attrs
);
160 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
161 * and interaction <canvas> inside of it. See the constructor for details
163 * @param {Element} div the Element to render the graph into.
164 * @param {String | Function} file Source data
165 * @param {Object} attrs Miscellaneous other options
168 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
169 // Support two-argument constructor
170 if (attrs
== null) { attrs
= {}; }
172 // Copy the important bits into the object
173 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
176 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
177 this.previousVerticalX_
= -1;
178 this.fractions_
= attrs
.fractions
|| false;
179 this.dateWindow_
= attrs
.dateWindow
|| null;
181 this.wilsonInterval_
= attrs
.wilsonInterval
|| true;
182 this.is_initial_draw_
= true;
183 this.annotations_
= [];
185 // Clear the div. This ensure that, if multiple dygraphs are passed the same
186 // div, then only one will be drawn.
189 // If the div isn't already sized then inherit from our attrs or
190 // give it a default size.
191 if (div
.style
.width
== '') {
192 div
.style
.width
= (attrs
.width
|| Dygraph
.DEFAULT_WIDTH
) + "px";
194 if (div
.style
.height
== '') {
195 div
.style
.height
= (attrs
.height
|| Dygraph
.DEFAULT_HEIGHT
) + "px";
197 this.width_
= parseInt(div
.style
.width
, 10);
198 this.height_
= parseInt(div
.style
.height
, 10);
199 // The div might have been specified as percent of the current window size,
200 // convert that to an appropriate number of pixels.
201 if (div
.style
.width
.indexOf("%") == div
.style
.width
.length
- 1) {
202 this.width_
= div
.offsetWidth
;
204 if (div
.style
.height
.indexOf("%") == div
.style
.height
.length
- 1) {
205 this.height_
= div
.offsetHeight
;
208 if (this.width_
== 0) {
209 this.error("dygraph has zero width. Please specify a width in pixels.");
211 if (this.height_
== 0) {
212 this.error("dygraph has zero height. Please specify a height in pixels.");
215 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
216 if (attrs
['stackedGraph']) {
217 attrs
['fillGraph'] = true;
218 // TODO(nikhilk): Add any other stackedGraph checks here.
221 // Dygraphs has many options, some of which interact with one another.
222 // To keep track of everything, we maintain two sets of options:
224 // this.user_attrs_ only options explicitly set by the user.
225 // this.attrs_ defaults, options derived from user_attrs_, data.
227 // Options are then accessed this.attr_('attr'), which first looks at
228 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
229 // defaults without overriding behavior that the user specifically asks for.
230 this.user_attrs_
= {};
231 Dygraph
.update(this.user_attrs_
, attrs
);
234 Dygraph
.update(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
236 this.boundaryIds_
= [];
238 // Make a note of whether labels will be pulled from the CSV file.
239 this.labelsFromCSV_
= (this.attr_("labels") == null);
241 // Create the containing DIV and other interactive elements
242 this.createInterface_();
247 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
249 typeof(this.user_attrs_
[seriesName
]) != 'undefined' &&
250 this.user_attrs_
[seriesName
] != null &&
251 typeof(this.user_attrs_
[seriesName
][name
]) != 'undefined') {
252 return this.user_attrs_
[seriesName
][name
];
253 } else if (typeof(this.user_attrs_
[name
]) != 'undefined') {
254 return this.user_attrs_
[name
];
255 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
256 return this.attrs_
[name
];
262 // TODO(danvk): any way I can get the line numbers to be this.warn call?
263 Dygraph
.prototype.log
= function(severity
, message
) {
264 if (typeof(console
) != 'undefined') {
267 console
.debug('dygraphs: ' + message
);
270 console
.info('dygraphs: ' + message
);
272 case Dygraph
.WARNING
:
273 console
.warn('dygraphs: ' + message
);
276 console
.error('dygraphs: ' + message
);
281 Dygraph
.prototype.info
= function(message
) {
282 this.log(Dygraph
.INFO
, message
);
284 Dygraph
.prototype.warn
= function(message
) {
285 this.log(Dygraph
.WARNING
, message
);
287 Dygraph
.prototype.error
= function(message
) {
288 this.log(Dygraph
.ERROR
, message
);
292 * Returns the current rolling period, as set by the user or an option.
293 * @return {Number} The number of days in the rolling window
295 Dygraph
.prototype.rollPeriod
= function() {
296 return this.rollPeriod_
;
300 * Returns the currently-visible x-range. This can be affected by zooming,
301 * panning or a call to updateOptions.
302 * Returns a two-element array: [left, right].
303 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
305 Dygraph
.prototype.xAxisRange
= function() {
306 if (this.dateWindow_
) return this.dateWindow_
;
308 // The entire chart is visible.
309 var left
= this.rawData_
[0][0];
310 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
311 return [left
, right
];
315 * Returns the currently-visible y-range for an axis. This can be affected by
316 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
317 * called with no arguments, returns the range of the first axis.
318 * Returns a two-element array: [bottom, top].
320 Dygraph
.prototype.yAxisRange
= function(idx
) {
321 if (typeof(idx
) == "undefined") idx
= 0;
322 if (idx
< 0 || idx
>= this.axes_
.length
) return null;
323 return [ this.axes_
[idx
].computedValueRange
[0],
324 this.axes_
[idx
].computedValueRange
[1] ];
328 * Returns the currently-visible y-ranges for each axis. This can be affected by
329 * zooming, panning, calls to updateOptions, etc.
330 * Returns an array of [bottom, top] pairs, one for each y-axis.
332 Dygraph
.prototype.yAxisRanges
= function() {
334 for (var i
= 0; i
< this.axes_
.length
; i
++) {
335 ret
.push(this.yAxisRange(i
));
340 // TODO(danvk): use these functions throughout dygraphs.
342 * Convert from data coordinates to canvas/div X/Y coordinates.
343 * If specified, do this conversion for the coordinate system of a particular
344 * axis. Uses the first axis by default.
345 * Returns a two-element array: [X, Y]
347 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
348 var ret
= [null, null];
349 var area
= this.plotter_
.area
;
351 var xRange
= this.xAxisRange();
352 ret
[0] = area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
356 var yRange
= this.yAxisRange(axis
);
357 ret
[1] = area
.y
+ (yRange
[1] - y
) / (yRange
[1] - yRange
[0]) * area
.h
;
364 * Convert from canvas/div coords to data coordinates.
365 * If specified, do this conversion for the coordinate system of a particular
366 * axis. Uses the first axis by default.
367 * Returns a two-element array: [X, Y]
369 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
370 var ret
= [null, null];
371 var area
= this.plotter_
.area
;
373 var xRange
= this.xAxisRange();
374 ret
[0] = xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
378 var yRange
= this.yAxisRange(axis
);
379 ret
[1] = yRange
[0] + (area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
386 * Returns the number of columns (including the independent variable).
388 Dygraph
.prototype.numColumns
= function() {
389 return this.rawData_
[0].length
;
393 * Returns the number of rows (excluding any header/label row).
395 Dygraph
.prototype.numRows
= function() {
396 return this.rawData_
.length
;
400 * Returns the value in the given row and column. If the row and column exceed
401 * the bounds on the data, returns null. Also returns null if the value is
404 Dygraph
.prototype.getValue
= function(row
, col
) {
405 if (row
< 0 || row
> this.rawData_
.length
) return null;
406 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
408 return this.rawData_
[row
][col
];
411 Dygraph
.addEvent
= function(el
, evt
, fn
) {
412 var normed_fn
= function(e
) {
413 if (!e
) var e
= window
.event
;
416 if (window
.addEventListener
) { // Mozilla, Netscape, Firefox
417 el
.addEventListener(evt
, normed_fn
, false);
419 el
.attachEvent('on' + evt
, normed_fn
);
424 * Generates interface elements for the Dygraph: a containing div, a div to
425 * display the current point, and a textbox to adjust the rolling average
426 * period. Also creates the Renderer/Layout elements.
429 Dygraph
.prototype.createInterface_
= function() {
430 // Create the all-enclosing graph div
431 var enclosing
= this.maindiv_
;
433 this.graphDiv
= document
.createElement("div");
434 this.graphDiv
.style
.width
= this.width_
+ "px";
435 this.graphDiv
.style
.height
= this.height_
+ "px";
436 enclosing
.appendChild(this.graphDiv
);
438 // Create the canvas for interactive parts of the chart.
439 this.canvas_
= Dygraph
.createCanvas();
440 this.canvas_
.style
.position
= "absolute";
441 this.canvas_
.width
= this.width_
;
442 this.canvas_
.height
= this.height_
;
443 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
444 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
446 // ... and for static parts of the chart.
447 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
449 // The interactive parts of the graph are drawn on top of the chart.
450 this.graphDiv
.appendChild(this.hidden_
);
451 this.graphDiv
.appendChild(this.canvas_
);
452 this.mouseEventElement_
= this.canvas_
;
455 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(e
) {
456 dygraph
.mouseMove_(e
);
458 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(e
) {
459 dygraph
.mouseOut_(e
);
462 // Create the grapher
463 // TODO(danvk): why does the Layout need its own set of options?
464 this.layoutOptions_
= { 'xOriginIsZero': false };
465 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
466 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
467 Dygraph
.update(this.layoutOptions_
, {
468 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) });
470 this.layout_
= new DygraphLayout(this, this.layoutOptions_
);
472 // TODO(danvk): why does the Renderer need its own set of options?
473 this.renderOptions_
= { colorScheme
: this.colors_
,
475 axisLineWidth
: Dygraph
.AXIS_LINE_WIDTH
};
476 Dygraph
.update(this.renderOptions_
, this.attrs_
);
477 Dygraph
.update(this.renderOptions_
, this.user_attrs_
);
479 this.createStatusMessage_();
480 this.createDragInterface_();
484 * Detach DOM elements in the dygraph and null out all data references.
485 * Calling this when you're done with a dygraph can dramatically reduce memory
486 * usage. See, e.g., the tests/perf.html example.
488 Dygraph
.prototype.destroy
= function() {
489 var removeRecursive
= function(node
) {
490 while (node
.hasChildNodes()) {
491 removeRecursive(node
.firstChild
);
492 node
.removeChild(node
.firstChild
);
495 removeRecursive(this.maindiv_
);
497 var nullOut
= function(obj
) {
499 if (typeof(obj
[n
]) === 'object') {
505 // These may not all be necessary, but it can't hurt...
506 nullOut(this.layout_
);
507 nullOut(this.plotter_
);
512 * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on
513 * this particular canvas. All Dygraph work is done on this.canvas_.
514 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
515 * @return {Object} The newly-created canvas
518 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
519 var h
= Dygraph
.createCanvas();
520 h
.style
.position
= "absolute";
521 // TODO(danvk): h should be offset from canvas. canvas needs to include
522 // some extra area to make it easier to zoom in on the far left and far
523 // right. h needs to be precisely the plot area, so that clipping occurs.
524 h
.style
.top
= canvas
.style
.top
;
525 h
.style
.left
= canvas
.style
.left
;
526 h
.width
= this.width_
;
527 h
.height
= this.height_
;
528 h
.style
.width
= this.width_
+ "px"; // for IE
529 h
.style
.height
= this.height_
+ "px"; // for IE
533 // Taken from MochiKit.Color
534 Dygraph
.hsvToRGB
= function (hue
, saturation
, value
) {
538 if (saturation
=== 0) {
543 var i
= Math
.floor(hue
* 6);
544 var f
= (hue
* 6) - i
;
545 var p
= value
* (1 - saturation
);
546 var q
= value
* (1 - (saturation
* f
));
547 var t
= value
* (1 - (saturation
* (1 - f
)));
549 case 1: red
= q
; green
= value
; blue
= p
; break;
550 case 2: red
= p
; green
= value
; blue
= t
; break;
551 case 3: red
= p
; green
= q
; blue
= value
; break;
552 case 4: red
= t
; green
= p
; blue
= value
; break;
553 case 5: red
= value
; green
= p
; blue
= q
; break;
554 case 6: // fall through
555 case 0: red
= value
; green
= t
; blue
= p
; break;
558 red
= Math
.floor(255 * red
+ 0.5);
559 green
= Math
.floor(255 * green
+ 0.5);
560 blue
= Math
.floor(255 * blue
+ 0.5);
561 return 'rgb(' + red
+ ',' + green
+ ',' + blue
+ ')';
566 * Generate a set of distinct colors for the data series. This is done with a
567 * color wheel. Saturation/Value are customizable, and the hue is
568 * equally-spaced around the color wheel. If a custom set of colors is
569 * specified, that is used instead.
572 Dygraph
.prototype.setColors_
= function() {
573 // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do
574 // away with this.renderOptions_.
575 var num
= this.attr_("labels").length
- 1;
577 var colors
= this.attr_('colors');
579 var sat
= this.attr_('colorSaturation') || 1.0;
580 var val
= this.attr_('colorValue') || 0.5;
581 var half
= Math
.ceil(num
/ 2);
582 for (var i
= 1; i
<= num
; i
++) {
583 if (!this.visibility()[i
-1]) continue;
584 // alternate colors for high contrast.
585 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
586 var hue
= (1.0 * idx
/ (1 + num
));
587 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
590 for (var i
= 0; i
< num
; i
++) {
591 if (!this.visibility()[i
]) continue;
592 var colorStr
= colors
[i
% colors
.length
];
593 this.colors_
.push(colorStr
);
597 // TODO(danvk): update this w/r
/t/ the
new options system
.
598 this.renderOptions_
.colorScheme
= this.colors_
;
599 Dygraph
.update(this.plotter_
.options
, this.renderOptions_
);
600 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
601 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
605 * Return the list of colors. This is either the list of colors passed in the
606 * attributes, or the autogenerated list of rgb(r,g,b) strings.
607 * @return {Array<string>} The list of colors.
609 Dygraph
.prototype.getColors
= function() {
613 // The following functions are from quirksmode.org with a modification for Safari from
614 // http://blog.firetree.net/2005/07/04/javascript-find-position/
615 // http://www.quirksmode.org/js
/findpos
.html
616 Dygraph
.findPosX
= function(obj
) {
621 curleft
+= obj
.offsetLeft
;
622 if(!obj
.offsetParent
)
624 obj
= obj
.offsetParent
;
631 Dygraph
.findPosY
= function(obj
) {
636 curtop
+= obj
.offsetTop
;
637 if(!obj
.offsetParent
)
639 obj
= obj
.offsetParent
;
649 * Create the div that contains information on the selected point(s)
650 * This goes in the top right of the canvas, unless an external div has already
654 Dygraph
.prototype.createStatusMessage_
= function() {
655 var userLabelsDiv
= this.user_attrs_
["labelsDiv"];
656 if (userLabelsDiv
&& null != userLabelsDiv
657 && (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
658 this.user_attrs_
["labelsDiv"] = document
.getElementById(userLabelsDiv
);
660 if (!this.attr_("labelsDiv")) {
661 var divWidth
= this.attr_('labelsDivWidth');
663 "position": "absolute",
666 "width": divWidth
+ "px",
668 "left": (this.width_
- divWidth
- 2) + "px",
669 "background": "white",
671 "overflow": "hidden"};
672 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
673 var div
= document
.createElement("div");
674 for (var name
in messagestyle
) {
675 if (messagestyle
.hasOwnProperty(name
)) {
676 div
.style
[name
] = messagestyle
[name
];
679 this.graphDiv
.appendChild(div
);
680 this.attrs_
.labelsDiv
= div
;
685 * Position the labels div so that its right edge is flush with the right edge
686 * of the charting area.
688 Dygraph
.prototype.positionLabelsDiv_
= function() {
689 // Don't touch a user-specified labelsDiv.
690 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
692 var area
= this.plotter_
.area
;
693 var div
= this.attr_("labelsDiv");
694 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
698 * Create the text box to adjust the averaging period
701 Dygraph
.prototype.createRollInterface_
= function() {
702 // Create a roller if one doesn't exist already.
704 this.roller_
= document
.createElement("input");
705 this.roller_
.type
= "text";
706 this.roller_
.style
.display
= "none";
707 this.graphDiv
.appendChild(this.roller_
);
710 var display
= this.attr_('showRoller') ? 'block' : 'none';
712 var textAttr
= { "position": "absolute",
714 "top": (this.plotter_
.area
.h
- 25) + "px",
715 "left": (this.plotter_
.area
.x
+ 1) + "px",
718 this.roller_
.size
= "2";
719 this.roller_
.value
= this.rollPeriod_
;
720 for (var name
in textAttr
) {
721 if (textAttr
.hasOwnProperty(name
)) {
722 this.roller_
.style
[name
] = textAttr
[name
];
727 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
730 // These functions are taken from MochiKit.Signal
731 Dygraph
.pageX
= function(e
) {
733 return (!e
.pageX
|| e
.pageX
< 0) ? 0 : e
.pageX
;
736 var b
= document
.body
;
738 (de
.scrollLeft
|| b
.scrollLeft
) -
739 (de
.clientLeft
|| 0);
743 Dygraph
.pageY
= function(e
) {
745 return (!e
.pageY
|| e
.pageY
< 0) ? 0 : e
.pageY
;
748 var b
= document
.body
;
750 (de
.scrollTop
|| b
.scrollTop
) -
756 * Set up all the mouse handlers needed to capture dragging behavior for zoom
760 Dygraph
.prototype.createDragInterface_
= function() {
763 // Tracks whether the mouse is down right now
764 var isZooming
= false;
765 var isPanning
= false; // is this drag part of a pan?
766 var is2DPan
= false; // if so, is that pan 1- or 2-dimensional?
767 var dragStartX
= null;
768 var dragStartY
= null;
771 var dragDirection
= null;
774 var prevDragDirection
= null;
776 // TODO(danvk): update this comment
777 // draggingDate and draggingValue represent the [date,value] point on the
778 // graph at which the mouse was pressed. As the mouse moves while panning,
779 // the viewport must pan so that the mouse position points to
780 // [draggingDate, draggingValue]
781 var draggingDate
= null;
783 // TODO(danvk): update this comment
784 // The range in second/value units that the viewport encompasses during a
785 // panning operation.
786 var dateRange
= null;
788 // Utility function to convert page-wide coordinates to canvas coords
791 var getX
= function(e
) { return Dygraph
.pageX(e
) - px
};
792 var getY
= function(e
) { return Dygraph
.pageY(e
) - py
};
794 // Draw zoom rectangles when the mouse is down and the user moves around
795 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(event
) {
797 dragEndX
= getX(event
);
798 dragEndY
= getY(event
);
800 var xDelta
= Math
.abs(dragStartX
- dragEndX
);
801 var yDelta
= Math
.abs(dragStartY
- dragEndY
);
803 // drag direction threshold for y axis is twice as large as x axis
804 dragDirection
= (xDelta
< yDelta
/ 2) ? Dygraph
.VERTICAL
: Dygraph
.HORIZONTAL
;
806 self
.drawZoomRect_(dragDirection
, dragStartX
, dragEndX
, dragStartY
, dragEndY
,
807 prevDragDirection
, prevEndX
, prevEndY
);
811 prevDragDirection
= dragDirection
;
812 } else if (isPanning
) {
813 dragEndX
= getX(event
);
814 dragEndY
= getY(event
);
816 // TODO(danvk): update this comment
817 // Want to have it so that:
818 // 1. draggingDate appears at dragEndX, draggingValue appears at dragEndY.
819 // 2. daterange = (dateWindow_[1] - dateWindow_[0]) is unaltered.
820 // 3. draggingValue appears at dragEndY.
821 // 4. valueRange is unaltered.
823 var minDate
= draggingDate
- (dragEndX
/ self
.width_
) * dateRange
;
824 var maxDate
= minDate
+ dateRange
;
825 self
.dateWindow_
= [minDate
, maxDate
];
828 // y-axis scaling is automatic unless this is a full 2D pan.
830 // Adjust each axis appropriately.
831 var y_frac
= dragEndY
/ self
.height_
;
832 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
833 var axis
= self
.axes_
[i
];
834 var maxValue
= axis
.draggingValue
+ y_frac
* axis
.dragValueRange
;
835 var minValue
= maxValue
- axis
.dragValueRange
;
836 axis
.valueWindow
= [ minValue
, maxValue
];
844 // Track the beginning of drag events
845 Dygraph
.addEvent(this.mouseEventElement_
, 'mousedown', function(event
) {
846 // prevents mouse drags from selecting page text.
847 if (event
.preventDefault
) {
848 event
.preventDefault(); // Firefox, Chrome, etc.
850 event
.returnValue
= false; // IE
851 event
.cancelBubble
= true;
854 px
= Dygraph
.findPosX(self
.canvas_
);
855 py
= Dygraph
.findPosY(self
.canvas_
);
856 dragStartX
= getX(event
);
857 dragStartY
= getY(event
);
859 if (event
.altKey
|| event
.shiftKey
) {
860 // have to be zoomed in to pan.
862 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
863 if (self
.axes_
[i
].valueWindow
|| self
.axes_
[i
].valueRange
) {
868 if (!self
.dateWindow_
&& !zoomedY
) return;
871 var xRange
= self
.xAxisRange();
872 dateRange
= xRange
[1] - xRange
[0];
874 // Record the range of each y-axis at the start of the drag.
875 // If any axis has a valueRange or valueWindow, then we want a 2D pan.
877 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
878 var axis
= self
.axes_
[i
];
879 var yRange
= self
.yAxisRange(i
);
880 axis
.dragValueRange
= yRange
[1] - yRange
[0];
881 var r
= self
.toDataCoords(null, dragStartY
, i
);
882 axis
.draggingValue
= r
[1];
883 if (axis
.valueWindow
|| axis
.valueRange
) is2DPan
= true;
886 // TODO(konigsberg): Switch from all this math to toDataCoords?
887 // Seems to work for the dragging value.
888 draggingDate
= (dragStartX
/ self
.width_
) * dateRange
+ xRange
[0];
894 // If the user releases the mouse button during a drag, but not over the
895 // canvas, then it doesn't count as a zooming action.
896 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
897 if (isZooming
|| isPanning
) {
907 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
908 delete self
.axes_
[i
].draggingValue
;
909 delete self
.axes_
[i
].dragValueRange
;
914 // Temporarily cancel the dragging event when the mouse leaves the graph
915 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(event
) {
922 // If the mouse is released on the canvas during a drag event, then it's a
923 // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels)
924 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseup', function(event
) {
927 dragEndX
= getX(event
);
928 dragEndY
= getY(event
);
929 var regionWidth
= Math
.abs(dragEndX
- dragStartX
);
930 var regionHeight
= Math
.abs(dragEndY
- dragStartY
);
932 if (regionWidth
< 2 && regionHeight
< 2 &&
933 self
.lastx_
!= undefined
&& self
.lastx_
!= -1) {
934 // TODO(danvk): pass along more info about the points, e.g. 'x'
935 if (self
.attr_('clickCallback') != null) {
936 self
.attr_('clickCallback')(event
, self
.lastx_
, self
.selPoints_
);
938 if (self
.attr_('pointClickCallback')) {
939 // check if the click was on a particular point.
941 var closestDistance
= 0;
942 for (var i
= 0; i
< self
.selPoints_
.length
; i
++) {
943 var p
= self
.selPoints_
[i
];
944 var distance
= Math
.pow(p
.canvasx
- dragEndX
, 2) +
945 Math
.pow(p
.canvasy
- dragEndY
, 2);
946 if (closestIdx
== -1 || distance
< closestDistance
) {
947 closestDistance
= distance
;
952 // Allow any click within two pixels of the dot.
953 var radius
= self
.attr_('highlightCircleSize') + 2;
954 if (closestDistance
<= 5 * 5) {
955 self
.attr_('pointClickCallback')(event
, self
.selPoints_
[closestIdx
]);
960 if (regionWidth
>= 10 && dragDirection
== Dygraph
.HORIZONTAL
) {
961 self
.doZoomX_(Math
.min(dragStartX
, dragEndX
),
962 Math
.max(dragStartX
, dragEndX
));
963 } else if (regionHeight
>= 10 && dragDirection
== Dygraph
.VERTICAL
){
964 self
.doZoomY_(Math
.min(dragStartY
, dragEndY
),
965 Math
.max(dragStartY
, dragEndY
));
967 self
.canvas_
.getContext("2d").clearRect(0, 0,
969 self
.canvas_
.height
);
985 // Double-clicking zooms back out
986 Dygraph
.addEvent(this.mouseEventElement_
, 'dblclick', function(event
) {
987 // Disable zooming out if panning.
988 if (event
.altKey
|| event
.shiftKey
) return;
995 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
996 * up any previous zoom rectangles that were drawn. This could be optimized to
997 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1000 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1001 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1002 * @param {Number} startX The X position where the drag started, in canvas
1004 * @param {Number} endX The current X position of the drag, in canvas coords.
1005 * @param {Number} startY The Y position where the drag started, in canvas
1007 * @param {Number} endY The current Y position of the drag, in canvas coords.
1008 * @param {Number} prevDirection the value of direction on the previous call to
1009 * this function. Used to avoid excess redrawing
1010 * @param {Number} prevEndX The value of endX on the previous call to this
1011 * function. Used to avoid excess redrawing
1012 * @param {Number} prevEndY The value of endY on the previous call to this
1013 * function. Used to avoid excess redrawing
1016 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
, endY
,
1017 prevDirection
, prevEndX
, prevEndY
) {
1018 var ctx
= this.canvas_
.getContext("2d");
1020 // Clean up from the previous rect if necessary
1021 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1022 ctx
.clearRect(Math
.min(startX
, prevEndX
), 0,
1023 Math
.abs(startX
- prevEndX
), this.height_
);
1024 } else if (prevDirection
== Dygraph
.VERTICAL
){
1025 ctx
.clearRect(0, Math
.min(startY
, prevEndY
),
1026 this.width_
, Math
.abs(startY
- prevEndY
));
1029 // Draw a light-grey rectangle to show the new viewing area
1030 if (direction
== Dygraph
.HORIZONTAL
) {
1031 if (endX
&& startX
) {
1032 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1033 ctx
.fillRect(Math
.min(startX
, endX
), 0,
1034 Math
.abs(endX
- startX
), this.height_
);
1037 if (direction
== Dygraph
.VERTICAL
) {
1038 if (endY
&& startY
) {
1039 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1040 ctx
.fillRect(0, Math
.min(startY
, endY
),
1041 this.width_
, Math
.abs(endY
- startY
));
1047 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1048 * the canvas. The exact zoom window may be slightly larger if there are no data
1049 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1050 * which accepts dates that match the raw data. This function redraws the graph.
1052 * @param {Number} lowX The leftmost pixel value that should be visible.
1053 * @param {Number} highX The rightmost pixel value that should be visible.
1056 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1057 // Find the earliest and latest dates contained in this canvasx range.
1058 // Convert the call to date ranges of the raw data.
1059 var r
= this.toDataCoords(lowX
, null);
1061 r
= this.toDataCoords(highX
, null);
1063 this.doZoomXDates_(minDate
, maxDate
);
1067 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1068 * method with doZoomX which accepts pixel coordinates. This function redraws
1071 * @param {Number} minDate The minimum date that should be visible.
1072 * @param {Number} maxDate The maximum date that should be visible.
1075 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1076 this.dateWindow_
= [minDate
, maxDate
];
1078 if (this.attr_("zoomCallback")) {
1079 var yRange
= this.yAxisRange();
1080 this.attr_("zoomCallback")(minDate
, maxDate
, yRange
[0], yRange
[1]);
1085 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1086 * the canvas. This function redraws the graph.
1088 * @param {Number} lowY The topmost pixel value that should be visible.
1089 * @param {Number} highY The lowest pixel value that should be visible.
1092 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1093 // Find the highest and lowest values in pixel range for each axis.
1094 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1095 // This is because pixels increase as you go down on the screen, whereas data
1096 // coordinates increase as you go up the screen.
1097 var valueRanges
= [];
1098 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1099 var hi
= this.toDataCoords(null, lowY
, i
);
1100 var low
= this.toDataCoords(null, highY
, i
);
1101 this.axes_
[i
].valueWindow
= [low
[1], hi
[1]];
1102 valueRanges
.push([low
[1], hi
[1]]);
1106 if (this.attr_("zoomCallback")) {
1107 var xRange
= this.xAxisRange();
1108 this.attr_("zoomCallback")(xRange
[0], xRange
[1], this.yAxisRanges());
1113 * Reset the zoom to the original view coordinates. This is the same as
1114 * double-clicking on the graph.
1118 Dygraph
.prototype.doUnzoom_
= function() {
1120 if (this.dateWindow_
!= null) {
1122 this.dateWindow_
= null;
1125 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1126 if (this.axes_
[i
].valueWindow
!= null) {
1128 delete this.axes_
[i
].valueWindow
;
1133 // Putting the drawing operation before the callback because it resets
1136 if (this.attr_("zoomCallback")) {
1137 var minDate
= this.rawData_
[0][0];
1138 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1139 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1145 * When the mouse moves in the canvas, display information about a nearby data
1146 * point and draw dots over those points in the data series. This function
1147 * takes care of cleanup of previously-drawn dots.
1148 * @param {Object} event The mousemove event from the browser.
1151 Dygraph
.prototype.mouseMove_
= function(event
) {
1152 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1153 var points
= this.layout_
.points
;
1158 // Loop through all the points and find the date nearest to our current
1160 var minDist
= 1e+100;
1162 for (var i
= 0; i
< points
.length
; i
++) {
1163 var point
= points
[i
];
1164 if (point
== null) continue;
1165 var dist
= Math
.abs(points
[i
].canvasx
- canvasx
);
1166 if (dist
> minDist
) continue;
1170 if (idx
>= 0) lastx
= points
[idx
].xval
;
1171 // Check that you can really highlight the last day's data
1172 var last
= points
[points
.length
-1];
1173 if (last
!= null && canvasx
> last
.canvasx
)
1174 lastx
= points
[points
.length
-1].xval
;
1176 // Extract the points we've selected
1177 this.selPoints_
= [];
1178 var l
= points
.length
;
1179 if (!this.attr_("stackedGraph")) {
1180 for (var i
= 0; i
< l
; i
++) {
1181 if (points
[i
].xval
== lastx
) {
1182 this.selPoints_
.push(points
[i
]);
1186 // Need to 'unstack' points starting from the bottom
1187 var cumulative_sum
= 0;
1188 for (var i
= l
- 1; i
>= 0; i
--) {
1189 if (points
[i
].xval
== lastx
) {
1190 var p
= {}; // Clone the point since we modify it
1191 for (var k
in points
[i
]) {
1192 p
[k
] = points
[i
][k
];
1194 p
.yval
-= cumulative_sum
;
1195 cumulative_sum
+= p
.yval
;
1196 this.selPoints_
.push(p
);
1199 this.selPoints_
.reverse();
1202 if (this.attr_("highlightCallback")) {
1203 var px
= this.lastx_
;
1204 if (px
!== null && lastx
!= px
) {
1205 // only fire if the selected point has changed.
1206 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
, this.idxToRow_(idx
));
1210 // Save last x position for callbacks.
1211 this.lastx_
= lastx
;
1213 this.updateSelection_();
1217 * Transforms layout_.points index into data row number
1218 * @param int layout_.points index
1219 * @return int row number
1222 Dygraph
.prototype.idxToRow_
= function(idx
) {
1225 for (var i
in this.layout_
.datasets
) {
1226 if (idx
< this.layout_
.datasets
[i
].length
) {
1227 return this.boundaryIds_
[0][0]+idx
;
1229 idx
-=this.layout_
.datasets
[i
].length
;
1236 * Draw dots over the selectied points in the data series. This function
1237 * takes care of cleanup of previously-drawn dots.
1240 Dygraph
.prototype.updateSelection_
= function() {
1241 // Clear the previously drawn vertical, if there is one
1242 var ctx
= this.canvas_
.getContext("2d");
1243 if (this.previousVerticalX_
>= 0) {
1244 // Determine the maximum highlight circle size.
1245 var maxCircleSize
= 0;
1246 var labels
= this.attr_('labels');
1247 for (var i
= 1; i
< labels
.length
; i
++) {
1248 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1249 if (r
> maxCircleSize
) maxCircleSize
= r
;
1251 var px
= this.previousVerticalX_
;
1252 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1253 2 * maxCircleSize
+ 2, this.height_
);
1256 var isOK
= function(x
) { return x
&& !isNaN(x
); };
1258 if (this.selPoints_
.length
> 0) {
1259 var canvasx
= this.selPoints_
[0].canvasx
;
1261 // Set the status message to indicate the selected point(s)
1262 var replace
= this.attr_('xValueFormatter')(this.lastx_
, this) + ":";
1263 var fmtFunc
= this.attr_('yValueFormatter');
1264 var clen
= this.colors_
.length
;
1266 if (this.attr_('showLabelsOnHighlight')) {
1267 // Set the status message to indicate the selected point(s)
1268 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1269 if (!this.attr_("labelsShowZeroValues") && this.selPoints_
[i
].yval
== 0) continue;
1270 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1271 if (this.attr_("labelsSeparateLines")) {
1274 var point
= this.selPoints_
[i
];
1275 var c
= new RGBColor(this.plotter_
.colors
[point
.name
]);
1276 var yval
= fmtFunc(point
.yval
);
1277 replace
+= " <b><font color='" + c
.toHex() + "'>"
1278 + point
.name
+ "</font></b>:"
1282 this.attr_("labelsDiv").innerHTML
= replace
;
1285 // Draw colored circles over the center of each selected point
1287 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1288 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1290 this.attr_('highlightCircleSize', this.selPoints_
[i
].name
);
1292 ctx
.fillStyle
= this.plotter_
.colors
[this.selPoints_
[i
].name
];
1293 ctx
.arc(canvasx
, this.selPoints_
[i
].canvasy
, circleSize
,
1294 0, 2 * Math
.PI
, false);
1299 this.previousVerticalX_
= canvasx
;
1304 * Set manually set selected dots, and display information about them
1305 * @param int row number that should by highlighted
1306 * false value clears the selection
1309 Dygraph
.prototype.setSelection
= function(row
) {
1310 // Extract the points we've selected
1311 this.selPoints_
= [];
1314 if (row
!== false) {
1315 row
= row
-this.boundaryIds_
[0][0];
1318 if (row
!== false && row
>= 0) {
1319 for (var i
in this.layout_
.datasets
) {
1320 if (row
< this.layout_
.datasets
[i
].length
) {
1321 var point
= this.layout_
.points
[pos
+row
];
1323 if (this.attr_("stackedGraph")) {
1324 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1327 this.selPoints_
.push(point
);
1329 pos
+= this.layout_
.datasets
[i
].length
;
1333 if (this.selPoints_
.length
) {
1334 this.lastx_
= this.selPoints_
[0].xval
;
1335 this.updateSelection_();
1338 this.clearSelection();
1344 * The mouse has left the canvas. Clear out whatever artifacts remain
1345 * @param {Object} event the mouseout event from the browser.
1348 Dygraph
.prototype.mouseOut_
= function(event
) {
1349 if (this.attr_("unhighlightCallback")) {
1350 this.attr_("unhighlightCallback")(event
);
1353 if (this.attr_("hideOverlayOnMouseOut")) {
1354 this.clearSelection();
1359 * Remove all selection from the canvas
1362 Dygraph
.prototype.clearSelection
= function() {
1363 // Get rid of the overlay data
1364 var ctx
= this.canvas_
.getContext("2d");
1365 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1366 this.attr_("labelsDiv").innerHTML
= "";
1367 this.selPoints_
= [];
1372 * Returns the number of the currently selected row
1373 * @return int row number, of -1 if nothing is selected
1376 Dygraph
.prototype.getSelection
= function() {
1377 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1381 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1382 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1383 return row
+ this.boundaryIds_
[0][0];
1389 Dygraph
.zeropad
= function(x
) {
1390 if (x
< 10) return "0" + x
; else return "" + x
;
1394 * Return a string version of the hours, minutes and seconds portion of a date.
1395 * @param {Number} date The JavaScript date (ms since epoch)
1396 * @return {String} A time of the form "HH:MM:SS"
1399 Dygraph
.hmsString_
= function(date
) {
1400 var zeropad
= Dygraph
.zeropad
;
1401 var d
= new Date(date
);
1402 if (d
.getSeconds()) {
1403 return zeropad(d
.getHours()) + ":" +
1404 zeropad(d
.getMinutes()) + ":" +
1405 zeropad(d
.getSeconds());
1407 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
1412 * Convert a JS date to a string appropriate to display on an axis that
1413 * is displaying values at the stated granularity.
1414 * @param {Date} date The date to format
1415 * @param {Number} granularity One of the Dygraph granularity constants
1416 * @return {String} The formatted date
1419 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1420 if (granularity
>= Dygraph
.MONTHLY
) {
1421 return date
.strftime('%b %y');
1423 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1424 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1425 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1427 return Dygraph
.hmsString_(date
.getTime());
1433 * Convert a JS date (millis since epoch) to YYYY/MM/DD
1434 * @param {Number} date The JavaScript date (ms since epoch)
1435 * @return {String} A date of the form "YYYY/MM/DD"
1438 Dygraph
.dateString_
= function(date
, self
) {
1439 var zeropad
= Dygraph
.zeropad
;
1440 var d
= new Date(date
);
1443 var year
= "" + d
.getFullYear();
1444 // Get a 0 padded month string
1445 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
1446 // Get a 0 padded day string
1447 var day
= zeropad(d
.getDate());
1450 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1451 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
1453 return year
+ "/" + month + "/" + day
+ ret
;
1457 * Round a number to the specified number of digits past the decimal point.
1458 * @param {Number} num The number to round
1459 * @param {Number} places The number of decimals to which to round
1460 * @return {Number} The rounded number
1463 Dygraph
.round_
= function(num
, places
) {
1464 var shift
= Math
.pow(10, places
);
1465 return Math
.round(num
* shift
)/shift
;
1469 * Fires when there's data available to be graphed.
1470 * @param {String} data Raw CSV data to be plotted
1473 Dygraph
.prototype.loadedEvent_
= function(data
) {
1474 this.rawData_
= this.parseCSV_(data
);
1478 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1479 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1480 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1483 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1486 Dygraph
.prototype.addXTicks_
= function() {
1487 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1488 var startDate
, endDate
;
1489 if (this.dateWindow_
) {
1490 startDate
= this.dateWindow_
[0];
1491 endDate
= this.dateWindow_
[1];
1493 startDate
= this.rawData_
[0][0];
1494 endDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1497 var xTicks
= this.attr_('xTicker')(startDate
, endDate
, this);
1498 this.layout_
.updateOptions({xTicks
: xTicks
});
1501 // Time granularity enumeration
1502 Dygraph
.SECONDLY
= 0;
1503 Dygraph
.TWO_SECONDLY
= 1;
1504 Dygraph
.FIVE_SECONDLY
= 2;
1505 Dygraph
.TEN_SECONDLY
= 3;
1506 Dygraph
.THIRTY_SECONDLY
= 4;
1507 Dygraph
.MINUTELY
= 5;
1508 Dygraph
.TWO_MINUTELY
= 6;
1509 Dygraph
.FIVE_MINUTELY
= 7;
1510 Dygraph
.TEN_MINUTELY
= 8;
1511 Dygraph
.THIRTY_MINUTELY
= 9;
1512 Dygraph
.HOURLY
= 10;
1513 Dygraph
.TWO_HOURLY
= 11;
1514 Dygraph
.SIX_HOURLY
= 12;
1516 Dygraph
.WEEKLY
= 14;
1517 Dygraph
.MONTHLY
= 15;
1518 Dygraph
.QUARTERLY
= 16;
1519 Dygraph
.BIANNUAL
= 17;
1520 Dygraph
.ANNUAL
= 18;
1521 Dygraph
.DECADAL
= 19;
1522 Dygraph
.NUM_GRANULARITIES
= 20;
1524 Dygraph
.SHORT_SPACINGS
= [];
1525 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1526 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1527 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1528 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1529 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1530 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1531 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1532 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1533 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1534 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1535 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1536 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1537 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1538 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1539 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1543 // If we used this time granularity, how many ticks would there be?
1544 // This is only an approximation, but it's generally good enough.
1546 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1547 if (granularity
< Dygraph
.MONTHLY
) {
1548 // Generate one tick mark for every fixed interval of time.
1549 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1550 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1552 var year_mod
= 1; // e.g. to only print one point every 10 years.
1553 var num_months
= 12;
1554 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1555 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1556 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1557 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1559 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1560 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1561 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1567 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1568 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1570 // Returns an array containing {v: millis, label: label} dictionaries.
1572 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1573 var formatter
= this.attr_("xAxisLabelFormatter");
1575 if (granularity
< Dygraph
.MONTHLY
) {
1576 // Generate one tick mark for every fixed interval of time.
1577 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1578 var format
= '%d%b'; // e.g. "1Jan"
1580 // Find a time less than start_time which occurs on a "nice" time boundary
1581 // for this granularity.
1582 var g
= spacing
/ 1000;
1583 var d
= new Date(start_time
);
1584 if (g
<= 60) { // seconds
1585 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1589 if (g
<= 60) { // minutes
1590 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1595 if (g
<= 24) { // days
1596 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1601 if (g
== 7) { // one week
1602 d
.setDate(d
.getDate() - d
.getDay());
1607 start_time
= d
.getTime();
1609 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1610 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1613 // Display a tick mark on the first of a set of months of each year.
1614 // Years get a tick mark iff y % year_mod == 0. This is useful for
1615 // displaying a tick mark once every 10 years, say, on long time scales.
1617 var year_mod
= 1; // e.g. to only print one point every 10 years.
1619 if (granularity
== Dygraph
.MONTHLY
) {
1620 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1621 } else if (granularity
== Dygraph
.QUARTERLY
) {
1622 months
= [ 0, 3, 6, 9 ];
1623 } else if (granularity
== Dygraph
.BIANNUAL
) {
1625 } else if (granularity
== Dygraph
.ANNUAL
) {
1627 } else if (granularity
== Dygraph
.DECADAL
) {
1632 var start_year
= new Date(start_time
).getFullYear();
1633 var end_year
= new Date(end_time
).getFullYear();
1634 var zeropad
= Dygraph
.zeropad
;
1635 for (var i
= start_year
; i
<= end_year
; i
++) {
1636 if (i
% year_mod
!= 0) continue;
1637 for (var j
= 0; j
< months
.length
; j
++) {
1638 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1639 var t
= Date
.parse(date_str
);
1640 if (t
< start_time
|| t
> end_time
) continue;
1641 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1651 * Add ticks to the x-axis based on a date range.
1652 * @param {Number} startDate Start of the date window (millis since epoch)
1653 * @param {Number} endDate End of the date window (millis since epoch)
1654 * @return {Array.<Object>} Array of {label, value} tuples.
1657 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1659 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1660 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1661 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1668 return self
.GetXAxis(startDate
, endDate
, chosen
);
1670 // TODO(danvk): signal error.
1675 * Add ticks when the x axis has numbers on it (instead of dates)
1676 * @param {Number} startDate Start of the date window (millis since epoch)
1677 * @param {Number} endDate End of the date window (millis since epoch)
1679 * @param {function} attribute accessor function.
1680 * @return {Array.<Object>} Array of {label, value} tuples.
1683 Dygraph
.numericTicks
= function(minV
, maxV
, self
, axis_props
, vals
) {
1684 var attr
= function(k
) {
1685 if (axis_props
&& axis_props
.hasOwnProperty(k
)) return axis_props
[k
];
1686 return self
.attr_(k
);
1691 for (var i
= 0; i
< vals
.length
; i
++) {
1692 ticks
.push({v
: vals
[i
]});
1696 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1697 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1698 // The first spacing greater than pixelsPerYLabel is what we use.
1699 // TODO(danvk): version that works on a log scale.
1700 if (attr("labelsKMG2")) {
1701 var mults
= [1, 2, 4, 8];
1703 var mults
= [1, 2, 5];
1705 var scale
, low_val
, high_val
, nTicks
;
1706 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1707 var pixelsPerTick
= attr('pixelsPerYLabel');
1708 for (var i
= -10; i
< 50; i
++) {
1709 if (attr("labelsKMG2")) {
1710 var base_scale
= Math
.pow(16, i
);
1712 var base_scale
= Math
.pow(10, i
);
1714 for (var j
= 0; j
< mults
.length
; j
++) {
1715 scale
= base_scale
* mults
[j
];
1716 low_val
= Math
.floor(minV
/ scale
) * scale
;
1717 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1718 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
1719 var spacing
= self
.height_
/ nTicks
;
1720 // wish I could break out of both loops at once...
1721 if (spacing
> pixelsPerTick
) break;
1723 if (spacing
> pixelsPerTick
) break;
1726 // Construct the set of ticks.
1727 // Allow reverse y-axis if it's explicitly requested.
1728 if (low_val
> high_val
) scale
*= -1;
1729 for (var i
= 0; i
< nTicks
; i
++) {
1730 var tickV
= low_val
+ i
* scale
;
1731 ticks
.push( {v
: tickV
} );
1735 // Add formatted labels to the ticks.
1738 if (attr("labelsKMB")) {
1740 k_labels
= [ "K", "M", "B", "T" ];
1742 if (attr("labelsKMG2")) {
1743 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1745 k_labels
= [ "k", "M", "G", "T" ];
1747 var formatter
= attr('yAxisLabelFormatter') ? attr('yAxisLabelFormatter') : attr('yValueFormatter');
1749 for (var i
= 0; i
< ticks
.length
; i
++) {
1750 var tickV
= ticks
[i
].v
;
1751 var absTickV
= Math
.abs(tickV
);
1753 if (formatter
!= undefined
) {
1754 label
= formatter(tickV
);
1756 label
= Dygraph
.round_(tickV
, 2);
1758 if (k_labels
.length
) {
1759 // Round up to an appropriate unit.
1761 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
1762 if (absTickV
>= n
) {
1763 label
= Dygraph
.round_(tickV
/ n
, 1) + k_labels
[j
];
1768 ticks
[i
].label
= label
;
1773 // Computes the range of the data series (including confidence intervals).
1774 // series is either [ [x1, y1], [x2, y2], ... ] or
1775 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1776 // Returns [low, high]
1777 Dygraph
.prototype.extremeValues_
= function(series
) {
1778 var minY
= null, maxY
= null;
1780 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1782 // With custom bars, maxY is the max of the high values.
1783 for (var j
= 0; j
< series
.length
; j
++) {
1784 var y
= series
[j
][1][0];
1786 var low
= y
- series
[j
][1][1];
1787 var high
= y
+ series
[j
][1][2];
1788 if (low
> y
) low
= y
; // this can happen with custom bars,
1789 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1790 if (maxY
== null || high
> maxY
) {
1793 if (minY
== null || low
< minY
) {
1798 for (var j
= 0; j
< series
.length
; j
++) {
1799 var y
= series
[j
][1];
1800 if (y
=== null || isNaN(y
)) continue;
1801 if (maxY
== null || y
> maxY
) {
1804 if (minY
== null || y
< minY
) {
1810 return [minY
, maxY
];
1814 * This function is called once when the chart's data is changed or the options
1815 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1816 * idea is that values derived from the chart's data can be computed here,
1817 * rather than every time the chart is drawn. This includes things like the
1818 * number of axes, rolling averages, etc.
1820 Dygraph
.prototype.predraw_
= function() {
1821 // TODO(danvk): move more computations out of drawGraph_ and into here.
1822 this.computeYAxes_();
1824 // Create a new plotter.
1825 if (this.plotter_
) this.plotter_
.clear();
1826 this.plotter_
= new DygraphCanvasRenderer(this,
1827 this.hidden_
, this.layout_
,
1828 this.renderOptions_
);
1830 // The roller sits in the bottom left corner of the chart. We don't know where
1831 // this will be until the options are available, so it's positioned here.
1832 this.createRollInterface_();
1834 // Same thing applies for the labelsDiv. It's right edge should be flush with
1835 // the right edge of the charting area (which may not be the same as the right
1836 // edge of the div, if we have two y-axes.
1837 this.positionLabelsDiv_();
1839 // If the data or options have changed, then we'd better redraw.
1845 * Update the graph with new data. This method is called when the viewing area
1846 * has changed. If the underlying data or options have changed, predraw_ will
1847 * be called before drawGraph_ is called.
1850 Dygraph
.prototype.drawGraph_
= function() {
1851 var data
= this.rawData_
;
1853 // This is used to set the second parameter to drawCallback, below.
1854 var is_initial_draw
= this.is_initial_draw_
;
1855 this.is_initial_draw_
= false;
1857 var minY
= null, maxY
= null;
1858 this.layout_
.removeAllDatasets();
1860 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
1862 // Loop over the fields (series). Go from the last to the first,
1863 // because if they're stacked that's how we accumulate the values.
1865 var cumulative_y
= []; // For stacked series.
1868 var extremes
= {}; // series name -> [low, high]
1870 // Loop over all fields and create datasets
1871 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
1872 if (!this.visibility()[i
- 1]) continue;
1874 var seriesName
= this.attr_("labels")[i
];
1875 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
1878 for (var j
= 0; j
< data
.length
; j
++) {
1879 if (data
[j
][i
] != null || !connectSeparatedPoints
) {
1880 var date
= data
[j
][0];
1881 series
.push([date
, data
[j
][i
]]);
1885 // TODO(danvk): move this into predraw_. It's insane to do it here.
1886 series
= this.rollingAverage(series
, this.rollPeriod_
);
1888 // Prune down to the desired range, if necessary (for zooming)
1889 // Because there can be lines going to points outside of the visible area,
1890 // we actually prune to visible points, plus one on either side.
1891 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1892 if (this.dateWindow_
) {
1893 var low
= this.dateWindow_
[0];
1894 var high
= this.dateWindow_
[1];
1896 // TODO(danvk): do binary search instead of linear search.
1897 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1898 var firstIdx
= null, lastIdx
= null;
1899 for (var k
= 0; k
< series
.length
; k
++) {
1900 if (series
[k
][0] >= low
&& firstIdx
=== null) {
1903 if (series
[k
][0] <= high
) {
1907 if (firstIdx
=== null) firstIdx
= 0;
1908 if (firstIdx
> 0) firstIdx
--;
1909 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
1910 if (lastIdx
< series
.length
- 1) lastIdx
++;
1911 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
1912 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
1913 pruned
.push(series
[k
]);
1917 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
1920 var seriesExtremes
= this.extremeValues_(series
);
1923 for (var j
=0; j
<series
.length
; j
++) {
1924 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
1927 } else if (this.attr_("stackedGraph")) {
1928 var l
= series
.length
;
1930 for (var j
= 0; j
< l
; j
++) {
1931 // If one data set has a NaN, let all subsequent stacked
1932 // sets inherit the NaN -- only start at 0 for the first set.
1933 var x
= series
[j
][0];
1934 if (cumulative_y
[x
] === undefined
) {
1935 cumulative_y
[x
] = 0;
1938 actual_y
= series
[j
][1];
1939 cumulative_y
[x
] += actual_y
;
1941 series
[j
] = [x
, cumulative_y
[x
]]
1943 if (cumulative_y
[x
] > seriesExtremes
[1]) {
1944 seriesExtremes
[1] = cumulative_y
[x
];
1946 if (cumulative_y
[x
] < seriesExtremes
[0]) {
1947 seriesExtremes
[0] = cumulative_y
[x
];
1951 extremes
[seriesName
] = seriesExtremes
;
1953 datasets
[i
] = series
;
1956 for (var i
= 1; i
< datasets
.length
; i
++) {
1957 if (!this.visibility()[i
- 1]) continue;
1958 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
1961 // TODO(danvk): this method doesn't need to return anything.
1962 var out
= this.computeYAxisRanges_(extremes
);
1964 var seriesToAxisMap
= out
[1];
1965 this.layout_
.updateOptions( { yAxes
: axes
,
1966 seriesToAxisMap
: seriesToAxisMap
1971 // Tell PlotKit to use this new data and render itself
1972 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
1973 this.layout_
.evaluateWithError();
1974 this.plotter_
.clear();
1975 this.plotter_
.render();
1976 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
1977 this.canvas_
.height
);
1979 if (this.attr_("drawCallback") !== null) {
1980 this.attr_("drawCallback")(this, is_initial_draw
);
1985 * Determine properties of the y-axes which are independent of the data
1986 * currently being displayed. This includes things like the number of axes and
1987 * the style of the axes. It does not include the range of each axis and its
1989 * This fills in this.axes_ and this.seriesToAxisMap_.
1990 * axes_ = [ { options } ]
1991 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
1992 * indices are into the axes_ array.
1994 Dygraph
.prototype.computeYAxes_
= function() {
1995 this.axes_
= [{}]; // always have at least one y-axis.
1996 this.seriesToAxisMap_
= {};
1998 // Get a list of series names.
1999 var labels
= this.attr_("labels");
2001 for (var i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2003 // all options which could be applied per-axis:
2011 'axisLabelFontSize',
2015 // Copy global axis options over to the first axis.
2016 for (var i
= 0; i
< axisOptions
.length
; i
++) {
2017 var k
= axisOptions
[i
];
2018 var v
= this.attr_(k
);
2019 if (v
) this.axes_
[0][k
] = v
;
2022 // Go through once and add all the axes.
2023 for (var seriesName
in series
) {
2024 if (!series
.hasOwnProperty(seriesName
)) continue;
2025 var axis
= this.attr_("axis", seriesName
);
2027 this.seriesToAxisMap_
[seriesName
] = 0;
2030 if (typeof(axis
) == 'object') {
2031 // Add a new axis, making a copy of its per-axis options.
2033 Dygraph
.update(opts
, this.axes_
[0]);
2034 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2035 Dygraph
.update(opts
, axis
);
2036 this.axes_
.push(opts
);
2037 this.seriesToAxisMap_
[seriesName
] = this.axes_
.length
- 1;
2041 // Go through one more time and assign series to an axis defined by another
2042 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2043 for (var seriesName
in series
) {
2044 if (!series
.hasOwnProperty(seriesName
)) continue;
2045 var axis
= this.attr_("axis", seriesName
);
2046 if (typeof(axis
) == 'string') {
2047 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2048 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2049 "series " + axis
+ ", which does not define its own axis.");
2052 var idx
= this.seriesToAxisMap_
[axis
];
2053 this.seriesToAxisMap_
[seriesName
] = idx
;
2057 // Now we remove series from seriesToAxisMap_ which are not visible. We do
2058 // this last so that hiding the first series doesn't destroy the axis
2059 // properties of the primary axis.
2060 var seriesToAxisFiltered
= {};
2061 var vis
= this.visibility();
2062 for (var i
= 1; i
< labels
.length
; i
++) {
2064 if (vis
[i
- 1]) seriesToAxisFiltered
[s
] = this.seriesToAxisMap_
[s
];
2066 this.seriesToAxisMap_
= seriesToAxisFiltered
;
2070 * Returns the number of y-axes on the chart.
2071 * @return {Number} the number of axes.
2073 Dygraph
.prototype.numAxes
= function() {
2075 for (var series
in this.seriesToAxisMap_
) {
2076 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2077 var idx
= this.seriesToAxisMap_
[series
];
2078 if (idx
> last_axis
) last_axis
= idx
;
2080 return 1 + last_axis
;
2084 * Determine the value range and tick marks for each axis.
2085 * @param {Object} extremes A mapping from seriesName -> [low, high]
2086 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2088 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2089 // Build a map from axis number -> [list of series names]
2090 var seriesForAxis
= [];
2091 for (var series
in this.seriesToAxisMap_
) {
2092 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2093 var idx
= this.seriesToAxisMap_
[series
];
2094 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2095 seriesForAxis
[idx
].push(series
);
2098 // Compute extreme values, a span and tick marks for each axis.
2099 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2100 var axis
= this.axes_
[i
];
2101 if (axis
.valueWindow
) {
2102 // This is only set if the user has zoomed on the y-axis. It is never set
2103 // by a user. It takes precedence over axis.valueRange because, if you set
2104 // valueRange, you'd still expect to be able to pan.
2105 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2106 } else if (axis
.valueRange
) {
2107 // This is a user-set value range for this axis.
2108 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2110 // Calculate the extremes of extremes.
2111 var series
= seriesForAxis
[i
];
2112 var minY
= Infinity
; // extremes[series[0]][0];
2113 var maxY
= -Infinity
; // extremes[series[0]][1];
2114 for (var j
= 0; j
< series
.length
; j
++) {
2115 minY
= Math
.min(extremes
[series
[j
]][0], minY
);
2116 maxY
= Math
.max(extremes
[series
[j
]][1], maxY
);
2118 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2120 // Add some padding and round up to an integer to be human-friendly.
2121 var span
= maxY
- minY
;
2122 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2123 if (span
== 0) { span
= maxY
; }
2124 var maxAxisY
= maxY
+ 0.1 * span
;
2125 var minAxisY
= minY
- 0.1 * span
;
2127 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2128 if (!this.attr_("avoidMinZero")) {
2129 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2130 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2133 if (this.attr_("includeZero")) {
2134 if (maxY
< 0) maxAxisY
= 0;
2135 if (minY
> 0) minAxisY
= 0;
2138 axis
.computedValueRange
= [minAxisY
, maxAxisY
];
2141 // Add ticks. By default, all axes inherit the tick positions of the
2142 // primary axis. However, if an axis is specifically marked as having
2143 // independent ticks, then that is permissible as well.
2144 if (i
== 0 || axis
.independentTicks
) {
2146 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2147 axis
.computedValueRange
[1],
2151 var p_axis
= this.axes_
[0];
2152 var p_ticks
= p_axis
.ticks
;
2153 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2154 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2155 var tick_values
= [];
2156 for (var i
= 0; i
< p_ticks
.length
; i
++) {
2157 var y_frac
= (p_ticks
[i
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2158 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2159 tick_values
.push(y_val
);
2163 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2164 axis
.computedValueRange
[1],
2165 this, axis
, tick_values
);
2169 return [this.axes_
, this.seriesToAxisMap_
];
2173 * Calculates the rolling average of a data set.
2174 * If originalData is [label, val], rolls the average of those.
2175 * If originalData is [label, [, it's interpreted as [value, stddev]
2176 * and the roll is returned in the same form, with appropriately reduced
2177 * stddev for each value.
2178 * Note that this is where fractional input (i.e. '5/10') is converted into
2180 * @param {Array} originalData The data in the appropriate format (see above)
2181 * @param {Number} rollPeriod The number of days over which to average the data
2183 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2184 if (originalData
.length
< 2)
2185 return originalData
;
2186 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
2187 var rollingData
= [];
2188 var sigma
= this.attr_("sigma");
2190 if (this.fractions_
) {
2192 var den
= 0; // numerator/denominator
2194 for (var i
= 0; i
< originalData
.length
; i
++) {
2195 num
+= originalData
[i
][1][0];
2196 den
+= originalData
[i
][1][1];
2197 if (i
- rollPeriod
>= 0) {
2198 num
-= originalData
[i
- rollPeriod
][1][0];
2199 den
-= originalData
[i
- rollPeriod
][1][1];
2202 var date
= originalData
[i
][0];
2203 var value
= den
? num
/ den
: 0.0;
2204 if (this.attr_("errorBars")) {
2205 if (this.wilsonInterval_
) {
2206 // For more details on this confidence interval, see:
2207 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2209 var p
= value
< 0 ? 0 : value
, n
= den
;
2210 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2211 var denom
= 1 + sigma
* sigma
/ den
;
2212 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2213 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2214 rollingData
[i
] = [date
,
2215 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2217 rollingData
[i
] = [date
, [0, 0, 0]];
2220 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2221 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2224 rollingData
[i
] = [date
, mult
* value
];
2227 } else if (this.attr_("customBars")) {
2232 for (var i
= 0; i
< originalData
.length
; i
++) {
2233 var data
= originalData
[i
][1];
2235 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2237 if (y
!= null && !isNaN(y
)) {
2243 if (i
- rollPeriod
>= 0) {
2244 var prev
= originalData
[i
- rollPeriod
];
2245 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
2252 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2253 1.0 * (mid
- low
) / count
,
2254 1.0 * (high
- mid
) / count
]];
2257 // Calculate the rolling average for the first rollPeriod - 1 points where
2258 // there is not enough data to roll over the full number of days
2259 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
2260 if (!this.attr_("errorBars")){
2261 if (rollPeriod
== 1) {
2262 return originalData
;
2265 for (var i
= 0; i
< originalData
.length
; i
++) {
2268 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2269 var y
= originalData
[j
][1];
2270 if (y
== null || isNaN(y
)) continue;
2272 sum
+= originalData
[j
][1];
2275 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2277 rollingData
[i
] = [originalData
[i
][0], null];
2282 for (var i
= 0; i
< originalData
.length
; i
++) {
2286 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2287 var y
= originalData
[j
][1][0];
2288 if (y
== null || isNaN(y
)) continue;
2290 sum
+= originalData
[j
][1][0];
2291 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2294 var stddev
= Math
.sqrt(variance
) / num_ok
;
2295 rollingData
[i
] = [originalData
[i
][0],
2296 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2298 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2308 * Parses a date, returning the number of milliseconds since epoch. This can be
2309 * passed in as an xValueParser in the Dygraph constructor.
2310 * TODO(danvk): enumerate formats that this understands.
2311 * @param {String} A date in YYYYMMDD format.
2312 * @return {Number} Milliseconds since epoch.
2315 Dygraph
.dateParser
= function(dateStr
, self
) {
2318 if (dateStr
.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12'
2319 dateStrSlashed
= dateStr
.replace("-", "/", "g");
2320 while (dateStrSlashed
.search("-") != -1) {
2321 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
2323 d
= Date
.parse(dateStrSlashed
);
2324 } else if (dateStr
.length
== 8) { // e.g. '20090712'
2325 // TODO(danvk): remove support for this format. It's confusing.
2326 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
2327 + "/" + dateStr
.substr(6,2);
2328 d
= Date
.parse(dateStrSlashed
);
2330 // Any format that Date.parse will accept, e.g. "2009/07/12" or
2331 // "2009/07/12 12:34:56"
2332 d
= Date
.parse(dateStr
);
2335 if (!d
|| isNaN(d
)) {
2336 self
.error("Couldn't parse " + dateStr
+ " as a date");
2342 * Detects the type of the str (date or numeric) and sets the various
2343 * formatting attributes in this.attrs_ based on this type.
2344 * @param {String} str An x value.
2347 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2349 if (str
.indexOf('-') >= 0 ||
2350 str
.indexOf('/') >= 0 ||
2351 isNaN(parseFloat(str
))) {
2353 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2354 // TODO(danvk): remove support for this format.
2359 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2360 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2361 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2362 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2364 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2365 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2366 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2367 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2372 * Parses a string in a special csv format. We expect a csv file where each
2373 * line is a date point, and the first field in each line is the date string.
2374 * We also expect that all remaining fields represent series.
2375 * if the errorBars attribute is set, then interpret the fields as:
2376 * date, series1, stddev1, series2, stddev2, ...
2377 * @param {Array.<Object>} data See above.
2380 * @return Array.<Object> An array with one entry for each row. These entries
2381 * are an array of cells in that row. The first entry is the parsed x-value for
2382 * the row. The second, third, etc. are the y-values. These can take on one of
2383 * three forms, depending on the CSV and constructor parameters:
2385 * 2. [ value, stddev ]
2386 * 3. [ low value, center value, high value ]
2388 Dygraph
.prototype.parseCSV_
= function(data
) {
2390 var lines
= data
.split("\n");
2392 // Use the default delimiter or fall back to a tab if that makes sense.
2393 var delim
= this.attr_('delimiter');
2394 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2399 if (this.labelsFromCSV_
) {
2401 this.attrs_
.labels
= lines
[0].split(delim
);
2404 // Parse the x as a float or return null if it's not a number.
2405 var parseFloatOrNull
= function(x
) {
2406 var val
= parseFloat(x
);
2407 return isNaN(val
) ? null : val
;
2411 var defaultParserSet
= false; // attempt to auto-detect x value type
2412 var expectedCols
= this.attr_("labels").length
;
2413 var outOfOrder
= false;
2414 for (var i
= start
; i
< lines
.length
; i
++) {
2415 var line
= lines
[i
];
2416 if (line
.length
== 0) continue; // skip blank lines
2417 if (line
[0] == '#') continue; // skip comment lines
2418 var inFields
= line
.split(delim
);
2419 if (inFields
.length
< 2) continue;
2422 if (!defaultParserSet
) {
2423 this.detectTypeFromString_(inFields
[0]);
2424 xParser
= this.attr_("xValueParser");
2425 defaultParserSet
= true;
2427 fields
[0] = xParser(inFields
[0], this);
2429 // If fractions are expected, parse the numbers as "A/B
"
2430 if (this.fractions_) {
2431 for (var j = 1; j < inFields.length; j++) {
2432 // TODO(danvk): figure out an appropriate way to flag parse errors.
2433 var vals = inFields[j].split("/");
2434 fields[j] = [parseFloatOrNull(vals[0]), parseFloatOrNull(vals[1])];
2436 } else if (this.attr_("errorBars
")) {
2437 // If there are error bars, values are (value, stddev) pairs
2438 for (var j = 1; j < inFields.length; j += 2)
2439 fields[(j + 1) / 2] = [parseFloatOrNull(inFields[j]),
2440 parseFloatOrNull(inFields[j + 1])];
2441 } else if (this.attr_("customBars
")) {
2442 // Bars are a low;center;high tuple
2443 for (var j = 1; j < inFields.length; j++) {
2444 var vals = inFields[j].split(";");
2445 fields[j] = [ parseFloatOrNull(vals[0]),
2446 parseFloatOrNull(vals[1]),
2447 parseFloatOrNull(vals[2]) ];
2450 // Values are just numbers
2451 for (var j = 1; j < inFields.length; j++) {
2452 fields[j] = parseFloatOrNull(inFields[j]);
2455 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2460 if (fields.length != expectedCols) {
2461 this.error("Number of columns
in line
" + i + " (" + fields.length +
2462 ") does not agree
with number of
labels (" + expectedCols +
2468 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2469 ret.sort(function(a,b) { return a[0] - b[0] });
2476 * The user has provided their data as a pre-packaged JS array. If the x values
2477 * are numeric, this is the same as dygraphs' internal format. If the x values
2478 * are dates, we need to convert them from Date objects to ms since epoch.
2479 * @param {Array.<Object>} data
2480 * @return {Array.<Object>} data with numeric x values.
2482 Dygraph.prototype.parseArray_ = function(data) {
2483 // Peek at the first x value to see if it's numeric.
2484 if (data.length == 0) {
2485 this.error("Can
't plot empty data set");
2488 if (data[0].length == 0) {
2489 this.error("Data set cannot contain an empty row");
2493 if (this.attr_("labels") == null) {
2494 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2495 "in the options parameter");
2496 this.attrs_.labels = [ "X" ];
2497 for (var i = 1; i < data[0].length; i++) {
2498 this.attrs_.labels.push("Y" + i);
2502 if (Dygraph.isDateLike(data[0][0])) {
2503 // Some intelligent defaults for a date x-axis.
2504 this.attrs_.xValueFormatter = Dygraph.dateString_;
2505 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
2506 this.attrs_.xTicker = Dygraph.dateTicker;
2508 // Assume they're all dates
.
2509 var parsedData
= Dygraph
.clone(data
);
2510 for (var i
= 0; i
< data
.length
; i
++) {
2511 if (parsedData
[i
].length
== 0) {
2512 this.error("Row " + (1 + i
) + " of data is empty");
2515 if (parsedData
[i
][0] == null
2516 || typeof(parsedData
[i
][0].getTime
) != 'function'
2517 || isNaN(parsedData
[i
][0].getTime())) {
2518 this.error("x value in row " + (1 + i
) + " is not a Date");
2521 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2525 // Some intelligent defaults for a numeric x-axis.
2526 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2527 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2533 * Parses a DataTable object from gviz.
2534 * The data is expected to have a first column that is either a date or a
2535 * number. All subsequent columns must be numbers. If there is a clear mismatch
2536 * between this.xValueParser_ and the type of the first column, it will be
2537 * fixed. Fills out rawData_.
2538 * @param {Array.<Object>} data See above.
2541 Dygraph
.prototype.parseDataTable_
= function(data
) {
2542 var cols
= data
.getNumberOfColumns();
2543 var rows
= data
.getNumberOfRows();
2545 var indepType
= data
.getColumnType(0);
2546 if (indepType
== 'date' || indepType
== 'datetime') {
2547 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2548 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2549 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2550 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2551 } else if (indepType
== 'number') {
2552 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2553 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2554 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2555 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2557 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2558 "column 1 of DataTable input (Got '" + indepType
+ "')");
2562 // Array of the column indices which contain data (and not annotations).
2564 var annotationCols
= {}; // data index -> [annotation cols]
2565 var hasAnnotations
= false;
2566 for (var i
= 1; i
< cols
; i
++) {
2567 var type
= data
.getColumnType(i
);
2568 if (type
== 'number') {
2570 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2571 // This is OK -- it's an annotation column.
2572 var dataIdx
= colIdx
[colIdx
.length
- 1];
2573 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2574 annotationCols
[dataIdx
] = [i
];
2576 annotationCols
[dataIdx
].push(i
);
2578 hasAnnotations
= true;
2580 this.error("Only 'number' is supported as a dependent type with Gviz." +
2581 " 'string' is only supported if displayAnnotations is true");
2585 // Read column labels
2586 // TODO(danvk): add support back for errorBars
2587 var labels
= [data
.getColumnLabel(0)];
2588 for (var i
= 0; i
< colIdx
.length
; i
++) {
2589 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2590 if (this.attr_("errorBars")) i
+= 1;
2592 this.attrs_
.labels
= labels
;
2593 cols
= labels
.length
;
2596 var outOfOrder
= false;
2597 var annotations
= [];
2598 for (var i
= 0; i
< rows
; i
++) {
2600 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2601 data
.getValue(i
, 0) === null) {
2602 this.warn("Ignoring row " + i
+
2603 " of DataTable because of undefined or null first column.");
2607 if (indepType
== 'date' || indepType
== 'datetime') {
2608 row
.push(data
.getValue(i
, 0).getTime());
2610 row
.push(data
.getValue(i
, 0));
2612 if (!this.attr_("errorBars")) {
2613 for (var j
= 0; j
< colIdx
.length
; j
++) {
2614 var col
= colIdx
[j
];
2615 row
.push(data
.getValue(i
, col
));
2616 if (hasAnnotations
&&
2617 annotationCols
.hasOwnProperty(col
) &&
2618 data
.getValue(i
, annotationCols
[col
][0]) != null) {
2620 ann
.series
= data
.getColumnLabel(col
);
2622 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
2624 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2625 if (k
) ann
.text
+= "\n";
2626 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2628 annotations
.push(ann
);
2632 for (var j
= 0; j
< cols
- 1; j
++) {
2633 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2636 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2643 this.warn("DataTable is out of order; order it correctly to speed loading.");
2644 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
2646 this.rawData_
= ret
;
2648 if (annotations
.length
> 0) {
2649 this.setAnnotations(annotations
, true);
2653 // These functions are all based on MochiKit.
2654 Dygraph
.update
= function (self
, o
) {
2655 if (typeof(o
) != 'undefined' && o
!== null) {
2657 if (o
.hasOwnProperty(k
)) {
2665 Dygraph
.isArrayLike
= function (o
) {
2666 var typ
= typeof(o
);
2668 (typ
!= 'object' && !(typ
== 'function' &&
2669 typeof(o
.item
) == 'function')) ||
2671 typeof(o
.length
) != 'number' ||
2679 Dygraph
.isDateLike
= function (o
) {
2680 if (typeof(o
) != "object" || o
=== null ||
2681 typeof(o
.getTime
) != 'function') {
2687 Dygraph
.clone
= function(o
) {
2688 // TODO(danvk): figure out how MochiKit's version works
2690 for (var i
= 0; i
< o
.length
; i
++) {
2691 if (Dygraph
.isArrayLike(o
[i
])) {
2692 r
.push(Dygraph
.clone(o
[i
]));
2702 * Get the CSV data. If it's in a function, call that function. If it's in a
2703 * file, do an XMLHttpRequest to get it.
2706 Dygraph
.prototype.start_
= function() {
2707 if (typeof this.file_
== 'function') {
2708 // CSV string. Pretend we got it via XHR.
2709 this.loadedEvent_(this.file_());
2710 } else if (Dygraph
.isArrayLike(this.file_
)) {
2711 this.rawData_
= this.parseArray_(this.file_
);
2713 } else if (typeof this.file_
== 'object' &&
2714 typeof this.file_
.getColumnRange
== 'function') {
2715 // must be a DataTable from gviz.
2716 this.parseDataTable_(this.file_
);
2718 } else if (typeof this.file_
== 'string') {
2719 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2720 if (this.file_
.indexOf('\n') >= 0) {
2721 this.loadedEvent_(this.file_
);
2723 var req
= new XMLHttpRequest();
2725 req
.onreadystatechange
= function () {
2726 if (req
.readyState
== 4) {
2727 if (req
.status
== 200) {
2728 caller
.loadedEvent_(req
.responseText
);
2733 req
.open("GET", this.file_
, true);
2737 this.error("Unknown data format: " + (typeof this.file_
));
2742 * Changes various properties of the graph. These can include:
2744 * <li>file: changes the source data for the graph</li>
2745 * <li>errorBars: changes whether the data contains stddev</li>
2747 * @param {Object} attrs The new properties and values
2749 Dygraph
.prototype.updateOptions
= function(attrs
) {
2750 // TODO(danvk): this is a mess. Rethink this function.
2751 if ('rollPeriod' in attrs
) {
2752 this.rollPeriod_
= attrs
.rollPeriod
;
2754 if ('dateWindow' in attrs
) {
2755 this.dateWindow_
= attrs
.dateWindow
;
2758 // TODO(danvk): validate per-series options.
2763 // highlightCircleSize
2765 Dygraph
.update(this.user_attrs_
, attrs
);
2766 Dygraph
.update(this.renderOptions_
, attrs
);
2768 this.labelsFromCSV_
= (this.attr_("labels") == null);
2770 // TODO(danvk): this doesn't match the constructor logic
2771 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
2772 if (attrs
['file']) {
2773 this.file_
= attrs
['file'];
2781 * Resizes the dygraph. If no parameters are specified, resizes to fill the
2782 * containing div (which has presumably changed size since the dygraph was
2783 * instantiated. If the width/height are specified, the div will be resized.
2785 * This is far more efficient than destroying and re-instantiating a
2786 * Dygraph, since it doesn't have to reparse the underlying data.
2788 * @param {Number} width Width (in pixels)
2789 * @param {Number} height Height (in pixels)
2791 Dygraph
.prototype.resize
= function(width
, height
) {
2792 if (this.resize_lock
) {
2795 this.resize_lock
= true;
2797 if ((width
=== null) != (height
=== null)) {
2798 this.warn("Dygraph.resize() should be called with zero parameters or " +
2799 "two non-NULL parameters. Pretending it was zero.");
2800 width
= height
= null;
2803 // TODO(danvk): there should be a clear() method.
2804 this.maindiv_
.innerHTML
= "";
2805 this.attrs_
.labelsDiv
= null;
2808 this.maindiv_
.style
.width
= width
+ "px";
2809 this.maindiv_
.style
.height
= height
+ "px";
2810 this.width_
= width
;
2811 this.height_
= height
;
2813 this.width_
= this.maindiv_
.offsetWidth
;
2814 this.height_
= this.maindiv_
.offsetHeight
;
2817 this.createInterface_();
2820 this.resize_lock
= false;
2824 * Adjusts the number of days in the rolling average. Updates the graph to
2825 * reflect the new averaging period.
2826 * @param {Number} length Number of days over which to average the data.
2828 Dygraph
.prototype.adjustRoll
= function(length
) {
2829 this.rollPeriod_
= length
;
2834 * Returns a boolean array of visibility statuses.
2836 Dygraph
.prototype.visibility
= function() {
2837 // Do lazy-initialization, so that this happens after we know the number of
2839 if (!this.attr_("visibility")) {
2840 this.attrs_
["visibility"] = [];
2842 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
2843 this.attr_("visibility").push(true);
2845 return this.attr_("visibility");
2849 * Changes the visiblity of a series.
2851 Dygraph
.prototype.setVisibility
= function(num
, value
) {
2852 var x
= this.visibility();
2853 if (num
< 0 || num
>= x
.length
) {
2854 this.warn("invalid series number in setVisibility: " + num
);
2862 * Update the list of annotations and redraw the chart.
2864 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
2865 // Only add the annotation CSS rule once we know it will be used.
2866 Dygraph
.addAnnotationRule();
2867 this.annotations_
= ann
;
2868 this.layout_
.setAnnotations(this.annotations_
);
2869 if (!suppressDraw
) {
2875 * Return the list of annotations.
2877 Dygraph
.prototype.annotations
= function() {
2878 return this.annotations_
;
2882 * Get the index of a series (column) given its name. The first column is the
2883 * x-axis, so the data series start with index 1.
2885 Dygraph
.prototype.indexFromSetName
= function(name
) {
2886 var labels
= this.attr_("labels");
2887 for (var i
= 0; i
< labels
.length
; i
++) {
2888 if (labels
[i
] == name
) return i
;
2893 Dygraph
.addAnnotationRule
= function() {
2894 if (Dygraph
.addedAnnotationCSS
) return;
2896 var rule
= "border: 1px solid black; " +
2897 "background-color: white; " +
2898 "text-align: center;";
2900 var styleSheetElement
= document
.createElement("style");
2901 styleSheetElement
.type
= "text/css";
2902 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
2904 // Find the first style sheet that we can access.
2905 // We may not add a rule to a style sheet from another domain for security
2906 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
2907 // adds its own style sheets from google.com.
2908 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
2909 if (document
.styleSheets
[i
].disabled
) continue;
2910 var mysheet
= document
.styleSheets
[i
];
2912 if (mysheet
.insertRule
) { // Firefox
2913 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
2914 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
2915 } else if (mysheet
.addRule
) { // IE
2916 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
2918 Dygraph
.addedAnnotationCSS
= true;
2921 // Was likely a security exception.
2925 this.warn("Unable to add default annotation CSS rule; display may be off.");
2929 * Create a new canvas element. This is more complex than a simple
2930 * document.createElement("canvas") because of IE and excanvas.
2932 Dygraph
.createCanvas
= function() {
2933 var canvas
= document
.createElement("canvas");
2935 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
2936 if (isIE
&& (typeof(G_vmlCanvasManager
) != 'undefined')) {
2937 canvas
= G_vmlCanvasManager
.initElement(canvas
);
2945 * A wrapper around Dygraph that implements the gviz API.
2946 * @param {Object} container The DOM object the visualization should live in.
2948 Dygraph
.GVizChart
= function(container
) {
2949 this.container
= container
;
2952 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
2953 // Clear out any existing dygraph.
2954 // TODO(danvk): would it make more sense to simply redraw using the current
2955 // date_graph object?
2956 this.container
.innerHTML
= '';
2957 if (typeof(this.date_graph
) != 'undefined') {
2958 this.date_graph
.destroy();
2961 this.date_graph
= new Dygraph(this.container
, data
, options
);
2965 * Google charts compatible setSelection
2966 * Only row selection is supported, all points in the row will be highlighted
2967 * @param {Array} array of the selected cells
2970 Dygraph
.GVizChart
.prototype.setSelection
= function(selection_array
) {
2972 if (selection_array
.length
) {
2973 row
= selection_array
[0].row
;
2975 this.date_graph
.setSelection(row
);
2979 * Google charts compatible getSelection implementation
2980 * @return {Array} array of the selected cells
2983 Dygraph
.GVizChart
.prototype.getSelection
= function() {
2986 var row
= this.date_graph
.getSelection();
2988 if (row
< 0) return selection
;
2991 for (var i
in this.date_graph
.layout_
.datasets
) {
2992 selection
.push({row
: row
, column
: col
});
2999 // Older pages may still use this name.
3000 DateGraph
= Dygraph
;