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 dist
= Math
.abs(points
[i
].canvasx
- canvasx
);
1164 if (dist
> minDist
) continue;
1168 if (idx
>= 0) lastx
= points
[idx
].xval
;
1169 // Check that you can really highlight the last day's data
1170 if (canvasx
> points
[points
.length
-1].canvasx
)
1171 lastx
= points
[points
.length
-1].xval
;
1173 // Extract the points we've selected
1174 this.selPoints_
= [];
1175 var l
= points
.length
;
1176 if (!this.attr_("stackedGraph")) {
1177 for (var i
= 0; i
< l
; i
++) {
1178 if (points
[i
].xval
== lastx
) {
1179 this.selPoints_
.push(points
[i
]);
1183 // Need to 'unstack' points starting from the bottom
1184 var cumulative_sum
= 0;
1185 for (var i
= l
- 1; i
>= 0; i
--) {
1186 if (points
[i
].xval
== lastx
) {
1187 var p
= {}; // Clone the point since we modify it
1188 for (var k
in points
[i
]) {
1189 p
[k
] = points
[i
][k
];
1191 p
.yval
-= cumulative_sum
;
1192 cumulative_sum
+= p
.yval
;
1193 this.selPoints_
.push(p
);
1196 this.selPoints_
.reverse();
1199 if (this.attr_("highlightCallback")) {
1200 var px
= this.lastx_
;
1201 if (px
!== null && lastx
!= px
) {
1202 // only fire if the selected point has changed.
1203 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
, this.idxToRow_(idx
));
1207 // Save last x position for callbacks.
1208 this.lastx_
= lastx
;
1210 this.updateSelection_();
1214 * Transforms layout_.points index into data row number
1215 * @param int layout_.points index
1216 * @return int row number
1219 Dygraph
.prototype.idxToRow_
= function(idx
) {
1222 for (var i
in this.layout_
.datasets
) {
1223 if (idx
< this.layout_
.datasets
[i
].length
) {
1224 return this.boundaryIds_
[0][0]+idx
;
1226 idx
-=this.layout_
.datasets
[i
].length
;
1233 * Draw dots over the selectied points in the data series. This function
1234 * takes care of cleanup of previously-drawn dots.
1237 Dygraph
.prototype.updateSelection_
= function() {
1238 // Clear the previously drawn vertical, if there is one
1239 var ctx
= this.canvas_
.getContext("2d");
1240 if (this.previousVerticalX_
>= 0) {
1241 // Determine the maximum highlight circle size.
1242 var maxCircleSize
= 0;
1243 var labels
= this.attr_('labels');
1244 for (var i
= 1; i
< labels
.length
; i
++) {
1245 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1246 if (r
> maxCircleSize
) maxCircleSize
= r
;
1248 var px
= this.previousVerticalX_
;
1249 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1250 2 * maxCircleSize
+ 2, this.height_
);
1253 var isOK
= function(x
) { return x
&& !isNaN(x
); };
1255 if (this.selPoints_
.length
> 0) {
1256 var canvasx
= this.selPoints_
[0].canvasx
;
1258 // Set the status message to indicate the selected point(s)
1259 var replace
= this.attr_('xValueFormatter')(this.lastx_
, this) + ":";
1260 var fmtFunc
= this.attr_('yValueFormatter');
1261 var clen
= this.colors_
.length
;
1263 if (this.attr_('showLabelsOnHighlight')) {
1264 // Set the status message to indicate the selected point(s)
1265 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1266 if (!this.attr_("labelsShowZeroValues") && this.selPoints_
[i
].yval
== 0) continue;
1267 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1268 if (this.attr_("labelsSeparateLines")) {
1271 var point
= this.selPoints_
[i
];
1272 var c
= new RGBColor(this.plotter_
.colors
[point
.name
]);
1273 var yval
= fmtFunc(point
.yval
);
1274 replace
+= " <b><font color='" + c
.toHex() + "'>"
1275 + point
.name
+ "</font></b>:"
1279 this.attr_("labelsDiv").innerHTML
= replace
;
1282 // Draw colored circles over the center of each selected point
1284 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1285 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1287 this.attr_('highlightCircleSize', this.selPoints_
[i
].name
);
1289 ctx
.fillStyle
= this.plotter_
.colors
[this.selPoints_
[i
].name
];
1290 ctx
.arc(canvasx
, this.selPoints_
[i
].canvasy
, circleSize
,
1291 0, 2 * Math
.PI
, false);
1296 this.previousVerticalX_
= canvasx
;
1301 * Set manually set selected dots, and display information about them
1302 * @param int row number that should by highlighted
1303 * false value clears the selection
1306 Dygraph
.prototype.setSelection
= function(row
) {
1307 // Extract the points we've selected
1308 this.selPoints_
= [];
1311 if (row
!== false) {
1312 row
= row
-this.boundaryIds_
[0][0];
1315 if (row
!== false && row
>= 0) {
1316 for (var i
in this.layout_
.datasets
) {
1317 if (row
< this.layout_
.datasets
[i
].length
) {
1318 var point
= this.layout_
.points
[pos
+row
];
1320 if (this.attr_("stackedGraph")) {
1321 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1324 this.selPoints_
.push(point
);
1326 pos
+= this.layout_
.datasets
[i
].length
;
1330 if (this.selPoints_
.length
) {
1331 this.lastx_
= this.selPoints_
[0].xval
;
1332 this.updateSelection_();
1335 this.clearSelection();
1341 * The mouse has left the canvas. Clear out whatever artifacts remain
1342 * @param {Object} event the mouseout event from the browser.
1345 Dygraph
.prototype.mouseOut_
= function(event
) {
1346 if (this.attr_("unhighlightCallback")) {
1347 this.attr_("unhighlightCallback")(event
);
1350 if (this.attr_("hideOverlayOnMouseOut")) {
1351 this.clearSelection();
1356 * Remove all selection from the canvas
1359 Dygraph
.prototype.clearSelection
= function() {
1360 // Get rid of the overlay data
1361 var ctx
= this.canvas_
.getContext("2d");
1362 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1363 this.attr_("labelsDiv").innerHTML
= "";
1364 this.selPoints_
= [];
1369 * Returns the number of the currently selected row
1370 * @return int row number, of -1 if nothing is selected
1373 Dygraph
.prototype.getSelection
= function() {
1374 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1378 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1379 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1380 return row
+ this.boundaryIds_
[0][0];
1386 Dygraph
.zeropad
= function(x
) {
1387 if (x
< 10) return "0" + x
; else return "" + x
;
1391 * Return a string version of the hours, minutes and seconds portion of a date.
1392 * @param {Number} date The JavaScript date (ms since epoch)
1393 * @return {String} A time of the form "HH:MM:SS"
1396 Dygraph
.hmsString_
= function(date
) {
1397 var zeropad
= Dygraph
.zeropad
;
1398 var d
= new Date(date
);
1399 if (d
.getSeconds()) {
1400 return zeropad(d
.getHours()) + ":" +
1401 zeropad(d
.getMinutes()) + ":" +
1402 zeropad(d
.getSeconds());
1404 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
1409 * Convert a JS date to a string appropriate to display on an axis that
1410 * is displaying values at the stated granularity.
1411 * @param {Date} date The date to format
1412 * @param {Number} granularity One of the Dygraph granularity constants
1413 * @return {String} The formatted date
1416 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1417 if (granularity
>= Dygraph
.MONTHLY
) {
1418 return date
.strftime('%b %y');
1420 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1421 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1422 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1424 return Dygraph
.hmsString_(date
.getTime());
1430 * Convert a JS date (millis since epoch) to YYYY/MM/DD
1431 * @param {Number} date The JavaScript date (ms since epoch)
1432 * @return {String} A date of the form "YYYY/MM/DD"
1435 Dygraph
.dateString_
= function(date
, self
) {
1436 var zeropad
= Dygraph
.zeropad
;
1437 var d
= new Date(date
);
1440 var year
= "" + d
.getFullYear();
1441 // Get a 0 padded month string
1442 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
1443 // Get a 0 padded day string
1444 var day
= zeropad(d
.getDate());
1447 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1448 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
1450 return year
+ "/" + month + "/" + day
+ ret
;
1454 * Round a number to the specified number of digits past the decimal point.
1455 * @param {Number} num The number to round
1456 * @param {Number} places The number of decimals to which to round
1457 * @return {Number} The rounded number
1460 Dygraph
.round_
= function(num
, places
) {
1461 var shift
= Math
.pow(10, places
);
1462 return Math
.round(num
* shift
)/shift
;
1466 * Fires when there's data available to be graphed.
1467 * @param {String} data Raw CSV data to be plotted
1470 Dygraph
.prototype.loadedEvent_
= function(data
) {
1471 this.rawData_
= this.parseCSV_(data
);
1475 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1476 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1477 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1480 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1483 Dygraph
.prototype.addXTicks_
= function() {
1484 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1485 var startDate
, endDate
;
1486 if (this.dateWindow_
) {
1487 startDate
= this.dateWindow_
[0];
1488 endDate
= this.dateWindow_
[1];
1490 startDate
= this.rawData_
[0][0];
1491 endDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1494 var xTicks
= this.attr_('xTicker')(startDate
, endDate
, this);
1495 this.layout_
.updateOptions({xTicks
: xTicks
});
1498 // Time granularity enumeration
1499 Dygraph
.SECONDLY
= 0;
1500 Dygraph
.TWO_SECONDLY
= 1;
1501 Dygraph
.FIVE_SECONDLY
= 2;
1502 Dygraph
.TEN_SECONDLY
= 3;
1503 Dygraph
.THIRTY_SECONDLY
= 4;
1504 Dygraph
.MINUTELY
= 5;
1505 Dygraph
.TWO_MINUTELY
= 6;
1506 Dygraph
.FIVE_MINUTELY
= 7;
1507 Dygraph
.TEN_MINUTELY
= 8;
1508 Dygraph
.THIRTY_MINUTELY
= 9;
1509 Dygraph
.HOURLY
= 10;
1510 Dygraph
.TWO_HOURLY
= 11;
1511 Dygraph
.SIX_HOURLY
= 12;
1513 Dygraph
.WEEKLY
= 14;
1514 Dygraph
.MONTHLY
= 15;
1515 Dygraph
.QUARTERLY
= 16;
1516 Dygraph
.BIANNUAL
= 17;
1517 Dygraph
.ANNUAL
= 18;
1518 Dygraph
.DECADAL
= 19;
1519 Dygraph
.NUM_GRANULARITIES
= 20;
1521 Dygraph
.SHORT_SPACINGS
= [];
1522 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1523 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1524 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1525 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1526 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1527 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1528 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1529 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1530 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1531 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1532 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1533 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1534 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1535 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1536 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1540 // If we used this time granularity, how many ticks would there be?
1541 // This is only an approximation, but it's generally good enough.
1543 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1544 if (granularity
< Dygraph
.MONTHLY
) {
1545 // Generate one tick mark for every fixed interval of time.
1546 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1547 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1549 var year_mod
= 1; // e.g. to only print one point every 10 years.
1550 var num_months
= 12;
1551 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1552 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1553 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1554 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1556 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1557 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1558 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1564 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1565 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1567 // Returns an array containing {v: millis, label: label} dictionaries.
1569 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1570 var formatter
= this.attr_("xAxisLabelFormatter");
1572 if (granularity
< Dygraph
.MONTHLY
) {
1573 // Generate one tick mark for every fixed interval of time.
1574 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1575 var format
= '%d%b'; // e.g. "1Jan"
1577 // Find a time less than start_time which occurs on a "nice" time boundary
1578 // for this granularity.
1579 var g
= spacing
/ 1000;
1580 var d
= new Date(start_time
);
1581 if (g
<= 60) { // seconds
1582 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1586 if (g
<= 60) { // minutes
1587 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1592 if (g
<= 24) { // days
1593 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1598 if (g
== 7) { // one week
1599 d
.setDate(d
.getDate() - d
.getDay());
1604 start_time
= d
.getTime();
1606 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1607 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1610 // Display a tick mark on the first of a set of months of each year.
1611 // Years get a tick mark iff y % year_mod == 0. This is useful for
1612 // displaying a tick mark once every 10 years, say, on long time scales.
1614 var year_mod
= 1; // e.g. to only print one point every 10 years.
1616 if (granularity
== Dygraph
.MONTHLY
) {
1617 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1618 } else if (granularity
== Dygraph
.QUARTERLY
) {
1619 months
= [ 0, 3, 6, 9 ];
1620 } else if (granularity
== Dygraph
.BIANNUAL
) {
1622 } else if (granularity
== Dygraph
.ANNUAL
) {
1624 } else if (granularity
== Dygraph
.DECADAL
) {
1629 var start_year
= new Date(start_time
).getFullYear();
1630 var end_year
= new Date(end_time
).getFullYear();
1631 var zeropad
= Dygraph
.zeropad
;
1632 for (var i
= start_year
; i
<= end_year
; i
++) {
1633 if (i
% year_mod
!= 0) continue;
1634 for (var j
= 0; j
< months
.length
; j
++) {
1635 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1636 var t
= Date
.parse(date_str
);
1637 if (t
< start_time
|| t
> end_time
) continue;
1638 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1648 * Add ticks to the x-axis based on a date range.
1649 * @param {Number} startDate Start of the date window (millis since epoch)
1650 * @param {Number} endDate End of the date window (millis since epoch)
1651 * @return {Array.<Object>} Array of {label, value} tuples.
1654 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1656 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1657 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1658 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1665 return self
.GetXAxis(startDate
, endDate
, chosen
);
1667 // TODO(danvk): signal error.
1672 * Add ticks when the x axis has numbers on it (instead of dates)
1673 * @param {Number} startDate Start of the date window (millis since epoch)
1674 * @param {Number} endDate End of the date window (millis since epoch)
1676 * @param {function} attribute accessor function.
1677 * @return {Array.<Object>} Array of {label, value} tuples.
1680 Dygraph
.numericTicks
= function(minV
, maxV
, self
, axis_props
, vals
) {
1681 var attr
= function(k
) {
1682 if (axis_props
&& axis_props
.hasOwnProperty(k
)) return axis_props
[k
];
1683 return self
.attr_(k
);
1688 for (var i
= 0; i
< vals
.length
; i
++) {
1689 ticks
.push({v
: vals
[i
]});
1693 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1694 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1695 // The first spacing greater than pixelsPerYLabel is what we use.
1696 // TODO(danvk): version that works on a log scale.
1697 if (attr("labelsKMG2")) {
1698 var mults
= [1, 2, 4, 8];
1700 var mults
= [1, 2, 5];
1702 var scale
, low_val
, high_val
, nTicks
;
1703 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1704 var pixelsPerTick
= attr('pixelsPerYLabel');
1705 for (var i
= -10; i
< 50; i
++) {
1706 if (attr("labelsKMG2")) {
1707 var base_scale
= Math
.pow(16, i
);
1709 var base_scale
= Math
.pow(10, i
);
1711 for (var j
= 0; j
< mults
.length
; j
++) {
1712 scale
= base_scale
* mults
[j
];
1713 low_val
= Math
.floor(minV
/ scale
) * scale
;
1714 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1715 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
1716 var spacing
= self
.height_
/ nTicks
;
1717 // wish I could break out of both loops at once...
1718 if (spacing
> pixelsPerTick
) break;
1720 if (spacing
> pixelsPerTick
) break;
1723 // Construct the set of ticks.
1724 // Allow reverse y-axis if it's explicitly requested.
1725 if (low_val
> high_val
) scale
*= -1;
1726 for (var i
= 0; i
< nTicks
; i
++) {
1727 var tickV
= low_val
+ i
* scale
;
1728 ticks
.push( {v
: tickV
} );
1732 // Add formatted labels to the ticks.
1735 if (attr("labelsKMB")) {
1737 k_labels
= [ "K", "M", "B", "T" ];
1739 if (attr("labelsKMG2")) {
1740 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1742 k_labels
= [ "k", "M", "G", "T" ];
1744 var formatter
= attr('yAxisLabelFormatter') ? attr('yAxisLabelFormatter') : attr('yValueFormatter');
1746 for (var i
= 0; i
< ticks
.length
; i
++) {
1747 var tickV
= ticks
[i
].v
;
1748 var absTickV
= Math
.abs(tickV
);
1750 if (formatter
!= undefined
) {
1751 label
= formatter(tickV
);
1753 label
= Dygraph
.round_(tickV
, 2);
1755 if (k_labels
.length
) {
1756 // Round up to an appropriate unit.
1758 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
1759 if (absTickV
>= n
) {
1760 label
= Dygraph
.round_(tickV
/ n
, 1) + k_labels
[j
];
1765 ticks
[i
].label
= label
;
1770 // Computes the range of the data series (including confidence intervals).
1771 // series is either [ [x1, y1], [x2, y2], ... ] or
1772 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1773 // Returns [low, high]
1774 Dygraph
.prototype.extremeValues_
= function(series
) {
1775 var minY
= null, maxY
= null;
1777 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1779 // With custom bars, maxY is the max of the high values.
1780 for (var j
= 0; j
< series
.length
; j
++) {
1781 var y
= series
[j
][1][0];
1783 var low
= y
- series
[j
][1][1];
1784 var high
= y
+ series
[j
][1][2];
1785 if (low
> y
) low
= y
; // this can happen with custom bars,
1786 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1787 if (maxY
== null || high
> maxY
) {
1790 if (minY
== null || low
< minY
) {
1795 for (var j
= 0; j
< series
.length
; j
++) {
1796 var y
= series
[j
][1];
1797 if (y
=== null || isNaN(y
)) continue;
1798 if (maxY
== null || y
> maxY
) {
1801 if (minY
== null || y
< minY
) {
1807 return [minY
, maxY
];
1811 * This function is called once when the chart's data is changed or the options
1812 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1813 * idea is that values derived from the chart's data can be computed here,
1814 * rather than every time the chart is drawn. This includes things like the
1815 * number of axes, rolling averages, etc.
1817 Dygraph
.prototype.predraw_
= function() {
1818 // TODO(danvk): move more computations out of drawGraph_ and into here.
1819 this.computeYAxes_();
1821 // Create a new plotter.
1822 if (this.plotter_
) this.plotter_
.clear();
1823 this.plotter_
= new DygraphCanvasRenderer(this,
1824 this.hidden_
, this.layout_
,
1825 this.renderOptions_
);
1827 // The roller sits in the bottom left corner of the chart. We don't know where
1828 // this will be until the options are available, so it's positioned here.
1829 this.createRollInterface_();
1831 // Same thing applies for the labelsDiv. It's right edge should be flush with
1832 // the right edge of the charting area (which may not be the same as the right
1833 // edge of the div, if we have two y-axes.
1834 this.positionLabelsDiv_();
1836 // If the data or options have changed, then we'd better redraw.
1842 * Update the graph with new data. This method is called when the viewing area
1843 * has changed. If the underlying data or options have changed, predraw_ will
1844 * be called before drawGraph_ is called.
1847 Dygraph
.prototype.drawGraph_
= function() {
1848 var data
= this.rawData_
;
1850 // This is used to set the second parameter to drawCallback, below.
1851 var is_initial_draw
= this.is_initial_draw_
;
1852 this.is_initial_draw_
= false;
1854 var minY
= null, maxY
= null;
1855 this.layout_
.removeAllDatasets();
1857 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
1859 // Loop over the fields (series). Go from the last to the first,
1860 // because if they're stacked that's how we accumulate the values.
1862 var cumulative_y
= []; // For stacked series.
1865 var extremes
= {}; // series name -> [low, high]
1867 // Loop over all fields and create datasets
1868 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
1869 if (!this.visibility()[i
- 1]) continue;
1871 var seriesName
= this.attr_("labels")[i
];
1872 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
1875 for (var j
= 0; j
< data
.length
; j
++) {
1876 if (data
[j
][i
] != null || !connectSeparatedPoints
) {
1877 var date
= data
[j
][0];
1878 series
.push([date
, data
[j
][i
]]);
1882 // TODO(danvk): move this into predraw_. It's insane to do it here.
1883 series
= this.rollingAverage(series
, this.rollPeriod_
);
1885 // Prune down to the desired range, if necessary (for zooming)
1886 // Because there can be lines going to points outside of the visible area,
1887 // we actually prune to visible points, plus one on either side.
1888 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1889 if (this.dateWindow_
) {
1890 var low
= this.dateWindow_
[0];
1891 var high
= this.dateWindow_
[1];
1893 // TODO(danvk): do binary search instead of linear search.
1894 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1895 var firstIdx
= null, lastIdx
= null;
1896 for (var k
= 0; k
< series
.length
; k
++) {
1897 if (series
[k
][0] >= low
&& firstIdx
=== null) {
1900 if (series
[k
][0] <= high
) {
1904 if (firstIdx
=== null) firstIdx
= 0;
1905 if (firstIdx
> 0) firstIdx
--;
1906 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
1907 if (lastIdx
< series
.length
- 1) lastIdx
++;
1908 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
1909 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
1910 pruned
.push(series
[k
]);
1914 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
1917 var seriesExtremes
= this.extremeValues_(series
);
1920 for (var j
=0; j
<series
.length
; j
++) {
1921 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
1924 } else if (this.attr_("stackedGraph")) {
1925 var l
= series
.length
;
1927 for (var j
= 0; j
< l
; j
++) {
1928 // If one data set has a NaN, let all subsequent stacked
1929 // sets inherit the NaN -- only start at 0 for the first set.
1930 var x
= series
[j
][0];
1931 if (cumulative_y
[x
] === undefined
) {
1932 cumulative_y
[x
] = 0;
1935 actual_y
= series
[j
][1];
1936 cumulative_y
[x
] += actual_y
;
1938 series
[j
] = [x
, cumulative_y
[x
]]
1940 if (cumulative_y
[x
] > seriesExtremes
[1]) {
1941 seriesExtremes
[1] = cumulative_y
[x
];
1943 if (cumulative_y
[x
] < seriesExtremes
[0]) {
1944 seriesExtremes
[0] = cumulative_y
[x
];
1948 extremes
[seriesName
] = seriesExtremes
;
1950 datasets
[i
] = series
;
1953 for (var i
= 1; i
< datasets
.length
; i
++) {
1954 if (!this.visibility()[i
- 1]) continue;
1955 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
1958 // TODO(danvk): this method doesn't need to return anything.
1959 var out
= this.computeYAxisRanges_(extremes
);
1961 var seriesToAxisMap
= out
[1];
1962 this.layout_
.updateOptions( { yAxes
: axes
,
1963 seriesToAxisMap
: seriesToAxisMap
1968 // Tell PlotKit to use this new data and render itself
1969 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
1970 this.layout_
.evaluateWithError();
1971 this.plotter_
.clear();
1972 this.plotter_
.render();
1973 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
1974 this.canvas_
.height
);
1976 if (this.attr_("drawCallback") !== null) {
1977 this.attr_("drawCallback")(this, is_initial_draw
);
1982 * Determine properties of the y-axes which are independent of the data
1983 * currently being displayed. This includes things like the number of axes and
1984 * the style of the axes. It does not include the range of each axis and its
1986 * This fills in this.axes_ and this.seriesToAxisMap_.
1987 * axes_ = [ { options } ]
1988 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
1989 * indices are into the axes_ array.
1991 Dygraph
.prototype.computeYAxes_
= function() {
1992 this.axes_
= [{}]; // always have at least one y-axis.
1993 this.seriesToAxisMap_
= {};
1995 // Get a list of series names.
1996 var labels
= this.attr_("labels");
1998 for (var i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2000 // all options which could be applied per-axis:
2008 'axisLabelFontSize',
2012 // Copy global axis options over to the first axis.
2013 for (var i
= 0; i
< axisOptions
.length
; i
++) {
2014 var k
= axisOptions
[i
];
2015 var v
= this.attr_(k
);
2016 if (v
) this.axes_
[0][k
] = v
;
2019 // Go through once and add all the axes.
2020 for (var seriesName
in series
) {
2021 if (!series
.hasOwnProperty(seriesName
)) continue;
2022 var axis
= this.attr_("axis", seriesName
);
2024 this.seriesToAxisMap_
[seriesName
] = 0;
2027 if (typeof(axis
) == 'object') {
2028 // Add a new axis, making a copy of its per-axis options.
2030 Dygraph
.update(opts
, this.axes_
[0]);
2031 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2032 Dygraph
.update(opts
, axis
);
2033 this.axes_
.push(opts
);
2034 this.seriesToAxisMap_
[seriesName
] = this.axes_
.length
- 1;
2038 // Go through one more time and assign series to an axis defined by another
2039 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2040 for (var seriesName
in series
) {
2041 if (!series
.hasOwnProperty(seriesName
)) continue;
2042 var axis
= this.attr_("axis", seriesName
);
2043 if (typeof(axis
) == 'string') {
2044 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2045 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2046 "series " + axis
+ ", which does not define its own axis.");
2049 var idx
= this.seriesToAxisMap_
[axis
];
2050 this.seriesToAxisMap_
[seriesName
] = idx
;
2054 // Now we remove series from seriesToAxisMap_ which are not visible. We do
2055 // this last so that hiding the first series doesn't destroy the axis
2056 // properties of the primary axis.
2057 var seriesToAxisFiltered
= {};
2058 var vis
= this.visibility();
2059 for (var i
= 1; i
< labels
.length
; i
++) {
2061 if (vis
[i
- 1]) seriesToAxisFiltered
[s
] = this.seriesToAxisMap_
[s
];
2063 this.seriesToAxisMap_
= seriesToAxisFiltered
;
2067 * Returns the number of y-axes on the chart.
2068 * @return {Number} the number of axes.
2070 Dygraph
.prototype.numAxes
= function() {
2072 for (var series
in this.seriesToAxisMap_
) {
2073 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2074 var idx
= this.seriesToAxisMap_
[series
];
2075 if (idx
> last_axis
) last_axis
= idx
;
2077 return 1 + last_axis
;
2081 * Determine the value range and tick marks for each axis.
2082 * @param {Object} extremes A mapping from seriesName -> [low, high]
2083 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2085 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2086 // Build a map from axis number -> [list of series names]
2087 var seriesForAxis
= [];
2088 for (var series
in this.seriesToAxisMap_
) {
2089 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2090 var idx
= this.seriesToAxisMap_
[series
];
2091 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2092 seriesForAxis
[idx
].push(series
);
2095 // Compute extreme values, a span and tick marks for each axis.
2096 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2097 var axis
= this.axes_
[i
];
2098 if (axis
.valueWindow
) {
2099 // This is only set if the user has zoomed on the y-axis. It is never set
2100 // by a user. It takes precedence over axis.valueRange because, if you set
2101 // valueRange, you'd still expect to be able to pan.
2102 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2103 } else if (axis
.valueRange
) {
2104 // This is a user-set value range for this axis.
2105 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2107 // Calculate the extremes of extremes.
2108 var series
= seriesForAxis
[i
];
2109 var minY
= Infinity
; // extremes[series[0]][0];
2110 var maxY
= -Infinity
; // extremes[series[0]][1];
2111 for (var j
= 0; j
< series
.length
; j
++) {
2112 minY
= Math
.min(extremes
[series
[j
]][0], minY
);
2113 maxY
= Math
.max(extremes
[series
[j
]][1], maxY
);
2115 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2117 // Add some padding and round up to an integer to be human-friendly.
2118 var span
= maxY
- minY
;
2119 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2120 if (span
== 0) { span
= maxY
; }
2121 var maxAxisY
= maxY
+ 0.1 * span
;
2122 var minAxisY
= minY
- 0.1 * span
;
2124 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2125 if (!this.attr_("avoidMinZero")) {
2126 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2127 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2130 if (this.attr_("includeZero")) {
2131 if (maxY
< 0) maxAxisY
= 0;
2132 if (minY
> 0) minAxisY
= 0;
2135 axis
.computedValueRange
= [minAxisY
, maxAxisY
];
2138 // Add ticks. By default, all axes inherit the tick positions of the
2139 // primary axis. However, if an axis is specifically marked as having
2140 // independent ticks, then that is permissible as well.
2141 if (i
== 0 || axis
.independentTicks
) {
2143 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2144 axis
.computedValueRange
[1],
2148 var p_axis
= this.axes_
[0];
2149 var p_ticks
= p_axis
.ticks
;
2150 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2151 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2152 var tick_values
= [];
2153 for (var i
= 0; i
< p_ticks
.length
; i
++) {
2154 var y_frac
= (p_ticks
[i
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2155 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2156 tick_values
.push(y_val
);
2160 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2161 axis
.computedValueRange
[1],
2162 this, axis
, tick_values
);
2166 return [this.axes_
, this.seriesToAxisMap_
];
2170 * Calculates the rolling average of a data set.
2171 * If originalData is [label, val], rolls the average of those.
2172 * If originalData is [label, [, it's interpreted as [value, stddev]
2173 * and the roll is returned in the same form, with appropriately reduced
2174 * stddev for each value.
2175 * Note that this is where fractional input (i.e. '5/10') is converted into
2177 * @param {Array} originalData The data in the appropriate format (see above)
2178 * @param {Number} rollPeriod The number of days over which to average the data
2180 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2181 if (originalData
.length
< 2)
2182 return originalData
;
2183 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
2184 var rollingData
= [];
2185 var sigma
= this.attr_("sigma");
2187 if (this.fractions_
) {
2189 var den
= 0; // numerator/denominator
2191 for (var i
= 0; i
< originalData
.length
; i
++) {
2192 num
+= originalData
[i
][1][0];
2193 den
+= originalData
[i
][1][1];
2194 if (i
- rollPeriod
>= 0) {
2195 num
-= originalData
[i
- rollPeriod
][1][0];
2196 den
-= originalData
[i
- rollPeriod
][1][1];
2199 var date
= originalData
[i
][0];
2200 var value
= den
? num
/ den
: 0.0;
2201 if (this.attr_("errorBars")) {
2202 if (this.wilsonInterval_
) {
2203 // For more details on this confidence interval, see:
2204 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2206 var p
= value
< 0 ? 0 : value
, n
= den
;
2207 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2208 var denom
= 1 + sigma
* sigma
/ den
;
2209 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2210 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2211 rollingData
[i
] = [date
,
2212 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2214 rollingData
[i
] = [date
, [0, 0, 0]];
2217 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2218 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2221 rollingData
[i
] = [date
, mult
* value
];
2224 } else if (this.attr_("customBars")) {
2229 for (var i
= 0; i
< originalData
.length
; i
++) {
2230 var data
= originalData
[i
][1];
2232 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2234 if (y
!= null && !isNaN(y
)) {
2240 if (i
- rollPeriod
>= 0) {
2241 var prev
= originalData
[i
- rollPeriod
];
2242 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
2249 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2250 1.0 * (mid
- low
) / count
,
2251 1.0 * (high
- mid
) / count
]];
2254 // Calculate the rolling average for the first rollPeriod - 1 points where
2255 // there is not enough data to roll over the full number of days
2256 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
2257 if (!this.attr_("errorBars")){
2258 if (rollPeriod
== 1) {
2259 return originalData
;
2262 for (var i
= 0; i
< originalData
.length
; i
++) {
2265 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2266 var y
= originalData
[j
][1];
2267 if (y
== null || isNaN(y
)) continue;
2269 sum
+= originalData
[j
][1];
2272 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2274 rollingData
[i
] = [originalData
[i
][0], null];
2279 for (var i
= 0; i
< originalData
.length
; i
++) {
2283 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2284 var y
= originalData
[j
][1][0];
2285 if (y
== null || isNaN(y
)) continue;
2287 sum
+= originalData
[j
][1][0];
2288 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2291 var stddev
= Math
.sqrt(variance
) / num_ok
;
2292 rollingData
[i
] = [originalData
[i
][0],
2293 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2295 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2305 * Parses a date, returning the number of milliseconds since epoch. This can be
2306 * passed in as an xValueParser in the Dygraph constructor.
2307 * TODO(danvk): enumerate formats that this understands.
2308 * @param {String} A date in YYYYMMDD format.
2309 * @return {Number} Milliseconds since epoch.
2312 Dygraph
.dateParser
= function(dateStr
, self
) {
2315 if (dateStr
.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12'
2316 dateStrSlashed
= dateStr
.replace("-", "/", "g");
2317 while (dateStrSlashed
.search("-") != -1) {
2318 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
2320 d
= Date
.parse(dateStrSlashed
);
2321 } else if (dateStr
.length
== 8) { // e.g. '20090712'
2322 // TODO(danvk): remove support for this format. It's confusing.
2323 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
2324 + "/" + dateStr
.substr(6,2);
2325 d
= Date
.parse(dateStrSlashed
);
2327 // Any format that Date.parse will accept, e.g. "2009/07/12" or
2328 // "2009/07/12 12:34:56"
2329 d
= Date
.parse(dateStr
);
2332 if (!d
|| isNaN(d
)) {
2333 self
.error("Couldn't parse " + dateStr
+ " as a date");
2339 * Detects the type of the str (date or numeric) and sets the various
2340 * formatting attributes in this.attrs_ based on this type.
2341 * @param {String} str An x value.
2344 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2346 if (str
.indexOf('-') >= 0 ||
2347 str
.indexOf('/') >= 0 ||
2348 isNaN(parseFloat(str
))) {
2350 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2351 // TODO(danvk): remove support for this format.
2356 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2357 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2358 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2359 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2361 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2362 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2363 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2364 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2369 * Parses a string in a special csv format. We expect a csv file where each
2370 * line is a date point, and the first field in each line is the date string.
2371 * We also expect that all remaining fields represent series.
2372 * if the errorBars attribute is set, then interpret the fields as:
2373 * date, series1, stddev1, series2, stddev2, ...
2374 * @param {Array.<Object>} data See above.
2377 * @return Array.<Object> An array with one entry for each row. These entries
2378 * are an array of cells in that row. The first entry is the parsed x-value for
2379 * the row. The second, third, etc. are the y-values. These can take on one of
2380 * three forms, depending on the CSV and constructor parameters:
2382 * 2. [ value, stddev ]
2383 * 3. [ low value, center value, high value ]
2385 Dygraph
.prototype.parseCSV_
= function(data
) {
2387 var lines
= data
.split("\n");
2389 // Use the default delimiter or fall back to a tab if that makes sense.
2390 var delim
= this.attr_('delimiter');
2391 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2396 if (this.labelsFromCSV_
) {
2398 this.attrs_
.labels
= lines
[0].split(delim
);
2401 // Parse the x as a float or return null if it's not a number.
2402 var parseFloatOrNull
= function(x
) {
2403 var val
= parseFloat(x
);
2404 return isNaN(val
) ? null : val
;
2408 var defaultParserSet
= false; // attempt to auto-detect x value type
2409 var expectedCols
= this.attr_("labels").length
;
2410 var outOfOrder
= false;
2411 for (var i
= start
; i
< lines
.length
; i
++) {
2412 var line
= lines
[i
];
2413 if (line
.length
== 0) continue; // skip blank lines
2414 if (line
[0] == '#') continue; // skip comment lines
2415 var inFields
= line
.split(delim
);
2416 if (inFields
.length
< 2) continue;
2419 if (!defaultParserSet
) {
2420 this.detectTypeFromString_(inFields
[0]);
2421 xParser
= this.attr_("xValueParser");
2422 defaultParserSet
= true;
2424 fields
[0] = xParser(inFields
[0], this);
2426 // If fractions are expected, parse the numbers as "A/B
"
2427 if (this.fractions_) {
2428 for (var j = 1; j < inFields.length; j++) {
2429 // TODO(danvk): figure out an appropriate way to flag parse errors.
2430 var vals = inFields[j].split("/");
2431 fields[j] = [parseFloatOrNull(vals[0]), parseFloatOrNull(vals[1])];
2433 } else if (this.attr_("errorBars
")) {
2434 // If there are error bars, values are (value, stddev) pairs
2435 for (var j = 1; j < inFields.length; j += 2)
2436 fields[(j + 1) / 2] = [parseFloatOrNull(inFields[j]),
2437 parseFloatOrNull(inFields[j + 1])];
2438 } else if (this.attr_("customBars
")) {
2439 // Bars are a low;center;high tuple
2440 for (var j = 1; j < inFields.length; j++) {
2441 var vals = inFields[j].split(";");
2442 fields[j] = [ parseFloatOrNull(vals[0]),
2443 parseFloatOrNull(vals[1]),
2444 parseFloatOrNull(vals[2]) ];
2447 // Values are just numbers
2448 for (var j = 1; j < inFields.length; j++) {
2449 fields[j] = parseFloatOrNull(inFields[j]);
2452 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2457 if (fields.length != expectedCols) {
2458 this.error("Number of columns
in line
" + i + " (" + fields.length +
2459 ") does not agree
with number of
labels (" + expectedCols +
2465 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2466 ret.sort(function(a,b) { return a[0] - b[0] });
2473 * The user has provided their data as a pre-packaged JS array. If the x values
2474 * are numeric, this is the same as dygraphs' internal format. If the x values
2475 * are dates, we need to convert them from Date objects to ms since epoch.
2476 * @param {Array.<Object>} data
2477 * @return {Array.<Object>} data with numeric x values.
2479 Dygraph.prototype.parseArray_ = function(data) {
2480 // Peek at the first x value to see if it's numeric.
2481 if (data.length == 0) {
2482 this.error("Can
't plot empty data set");
2485 if (data[0].length == 0) {
2486 this.error("Data set cannot contain an empty row");
2490 if (this.attr_("labels") == null) {
2491 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2492 "in the options parameter");
2493 this.attrs_.labels = [ "X" ];
2494 for (var i = 1; i < data[0].length; i++) {
2495 this.attrs_.labels.push("Y" + i);
2499 if (Dygraph.isDateLike(data[0][0])) {
2500 // Some intelligent defaults for a date x-axis.
2501 this.attrs_.xValueFormatter = Dygraph.dateString_;
2502 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
2503 this.attrs_.xTicker = Dygraph.dateTicker;
2505 // Assume they're all dates
.
2506 var parsedData
= Dygraph
.clone(data
);
2507 for (var i
= 0; i
< data
.length
; i
++) {
2508 if (parsedData
[i
].length
== 0) {
2509 this.error("Row " + (1 + i
) + " of data is empty");
2512 if (parsedData
[i
][0] == null
2513 || typeof(parsedData
[i
][0].getTime
) != 'function'
2514 || isNaN(parsedData
[i
][0].getTime())) {
2515 this.error("x value in row " + (1 + i
) + " is not a Date");
2518 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2522 // Some intelligent defaults for a numeric x-axis.
2523 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2524 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2530 * Parses a DataTable object from gviz.
2531 * The data is expected to have a first column that is either a date or a
2532 * number. All subsequent columns must be numbers. If there is a clear mismatch
2533 * between this.xValueParser_ and the type of the first column, it will be
2534 * fixed. Fills out rawData_.
2535 * @param {Array.<Object>} data See above.
2538 Dygraph
.prototype.parseDataTable_
= function(data
) {
2539 var cols
= data
.getNumberOfColumns();
2540 var rows
= data
.getNumberOfRows();
2542 var indepType
= data
.getColumnType(0);
2543 if (indepType
== 'date' || indepType
== 'datetime') {
2544 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2545 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2546 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2547 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2548 } else if (indepType
== 'number') {
2549 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2550 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2551 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2552 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2554 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2555 "column 1 of DataTable input (Got '" + indepType
+ "')");
2559 // Array of the column indices which contain data (and not annotations).
2561 var annotationCols
= {}; // data index -> [annotation cols]
2562 var hasAnnotations
= false;
2563 for (var i
= 1; i
< cols
; i
++) {
2564 var type
= data
.getColumnType(i
);
2565 if (type
== 'number') {
2567 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2568 // This is OK -- it's an annotation column.
2569 var dataIdx
= colIdx
[colIdx
.length
- 1];
2570 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2571 annotationCols
[dataIdx
] = [i
];
2573 annotationCols
[dataIdx
].push(i
);
2575 hasAnnotations
= true;
2577 this.error("Only 'number' is supported as a dependent type with Gviz." +
2578 " 'string' is only supported if displayAnnotations is true");
2582 // Read column labels
2583 // TODO(danvk): add support back for errorBars
2584 var labels
= [data
.getColumnLabel(0)];
2585 for (var i
= 0; i
< colIdx
.length
; i
++) {
2586 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2587 if (this.attr_("errorBars")) i
+= 1;
2589 this.attrs_
.labels
= labels
;
2590 cols
= labels
.length
;
2593 var outOfOrder
= false;
2594 var annotations
= [];
2595 for (var i
= 0; i
< rows
; i
++) {
2597 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2598 data
.getValue(i
, 0) === null) {
2599 this.warn("Ignoring row " + i
+
2600 " of DataTable because of undefined or null first column.");
2604 if (indepType
== 'date' || indepType
== 'datetime') {
2605 row
.push(data
.getValue(i
, 0).getTime());
2607 row
.push(data
.getValue(i
, 0));
2609 if (!this.attr_("errorBars")) {
2610 for (var j
= 0; j
< colIdx
.length
; j
++) {
2611 var col
= colIdx
[j
];
2612 row
.push(data
.getValue(i
, col
));
2613 if (hasAnnotations
&&
2614 annotationCols
.hasOwnProperty(col
) &&
2615 data
.getValue(i
, annotationCols
[col
][0]) != null) {
2617 ann
.series
= data
.getColumnLabel(col
);
2619 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
2621 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2622 if (k
) ann
.text
+= "\n";
2623 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2625 annotations
.push(ann
);
2629 for (var j
= 0; j
< cols
- 1; j
++) {
2630 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2633 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2640 this.warn("DataTable is out of order; order it correctly to speed loading.");
2641 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
2643 this.rawData_
= ret
;
2645 if (annotations
.length
> 0) {
2646 this.setAnnotations(annotations
, true);
2650 // These functions are all based on MochiKit.
2651 Dygraph
.update
= function (self
, o
) {
2652 if (typeof(o
) != 'undefined' && o
!== null) {
2654 if (o
.hasOwnProperty(k
)) {
2662 Dygraph
.isArrayLike
= function (o
) {
2663 var typ
= typeof(o
);
2665 (typ
!= 'object' && !(typ
== 'function' &&
2666 typeof(o
.item
) == 'function')) ||
2668 typeof(o
.length
) != 'number' ||
2676 Dygraph
.isDateLike
= function (o
) {
2677 if (typeof(o
) != "object" || o
=== null ||
2678 typeof(o
.getTime
) != 'function') {
2684 Dygraph
.clone
= function(o
) {
2685 // TODO(danvk): figure out how MochiKit's version works
2687 for (var i
= 0; i
< o
.length
; i
++) {
2688 if (Dygraph
.isArrayLike(o
[i
])) {
2689 r
.push(Dygraph
.clone(o
[i
]));
2699 * Get the CSV data. If it's in a function, call that function. If it's in a
2700 * file, do an XMLHttpRequest to get it.
2703 Dygraph
.prototype.start_
= function() {
2704 if (typeof this.file_
== 'function') {
2705 // CSV string. Pretend we got it via XHR.
2706 this.loadedEvent_(this.file_());
2707 } else if (Dygraph
.isArrayLike(this.file_
)) {
2708 this.rawData_
= this.parseArray_(this.file_
);
2710 } else if (typeof this.file_
== 'object' &&
2711 typeof this.file_
.getColumnRange
== 'function') {
2712 // must be a DataTable from gviz.
2713 this.parseDataTable_(this.file_
);
2715 } else if (typeof this.file_
== 'string') {
2716 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2717 if (this.file_
.indexOf('\n') >= 0) {
2718 this.loadedEvent_(this.file_
);
2720 var req
= new XMLHttpRequest();
2722 req
.onreadystatechange
= function () {
2723 if (req
.readyState
== 4) {
2724 if (req
.status
== 200) {
2725 caller
.loadedEvent_(req
.responseText
);
2730 req
.open("GET", this.file_
, true);
2734 this.error("Unknown data format: " + (typeof this.file_
));
2739 * Changes various properties of the graph. These can include:
2741 * <li>file: changes the source data for the graph</li>
2742 * <li>errorBars: changes whether the data contains stddev</li>
2744 * @param {Object} attrs The new properties and values
2746 Dygraph
.prototype.updateOptions
= function(attrs
) {
2747 // TODO(danvk): this is a mess. Rethink this function.
2748 if ('rollPeriod' in attrs
) {
2749 this.rollPeriod_
= attrs
.rollPeriod
;
2751 if ('dateWindow' in attrs
) {
2752 this.dateWindow_
= attrs
.dateWindow
;
2755 // TODO(danvk): validate per-series options.
2760 // highlightCircleSize
2762 Dygraph
.update(this.user_attrs_
, attrs
);
2763 Dygraph
.update(this.renderOptions_
, attrs
);
2765 this.labelsFromCSV_
= (this.attr_("labels") == null);
2767 // TODO(danvk): this doesn't match the constructor logic
2768 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
2769 if (attrs
['file']) {
2770 this.file_
= attrs
['file'];
2778 * Resizes the dygraph. If no parameters are specified, resizes to fill the
2779 * containing div (which has presumably changed size since the dygraph was
2780 * instantiated. If the width/height are specified, the div will be resized.
2782 * This is far more efficient than destroying and re-instantiating a
2783 * Dygraph, since it doesn't have to reparse the underlying data.
2785 * @param {Number} width Width (in pixels)
2786 * @param {Number} height Height (in pixels)
2788 Dygraph
.prototype.resize
= function(width
, height
) {
2789 if (this.resize_lock
) {
2792 this.resize_lock
= true;
2794 if ((width
=== null) != (height
=== null)) {
2795 this.warn("Dygraph.resize() should be called with zero parameters or " +
2796 "two non-NULL parameters. Pretending it was zero.");
2797 width
= height
= null;
2800 // TODO(danvk): there should be a clear() method.
2801 this.maindiv_
.innerHTML
= "";
2802 this.attrs_
.labelsDiv
= null;
2805 this.maindiv_
.style
.width
= width
+ "px";
2806 this.maindiv_
.style
.height
= height
+ "px";
2807 this.width_
= width
;
2808 this.height_
= height
;
2810 this.width_
= this.maindiv_
.offsetWidth
;
2811 this.height_
= this.maindiv_
.offsetHeight
;
2814 this.createInterface_();
2817 this.resize_lock
= false;
2821 * Adjusts the number of days in the rolling average. Updates the graph to
2822 * reflect the new averaging period.
2823 * @param {Number} length Number of days over which to average the data.
2825 Dygraph
.prototype.adjustRoll
= function(length
) {
2826 this.rollPeriod_
= length
;
2831 * Returns a boolean array of visibility statuses.
2833 Dygraph
.prototype.visibility
= function() {
2834 // Do lazy-initialization, so that this happens after we know the number of
2836 if (!this.attr_("visibility")) {
2837 this.attrs_
["visibility"] = [];
2839 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
2840 this.attr_("visibility").push(true);
2842 return this.attr_("visibility");
2846 * Changes the visiblity of a series.
2848 Dygraph
.prototype.setVisibility
= function(num
, value
) {
2849 var x
= this.visibility();
2850 if (num
< 0 || num
>= x
.length
) {
2851 this.warn("invalid series number in setVisibility: " + num
);
2859 * Update the list of annotations and redraw the chart.
2861 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
2862 // Only add the annotation CSS rule once we know it will be used.
2863 Dygraph
.addAnnotationRule();
2864 this.annotations_
= ann
;
2865 this.layout_
.setAnnotations(this.annotations_
);
2866 if (!suppressDraw
) {
2872 * Return the list of annotations.
2874 Dygraph
.prototype.annotations
= function() {
2875 return this.annotations_
;
2879 * Get the index of a series (column) given its name. The first column is the
2880 * x-axis, so the data series start with index 1.
2882 Dygraph
.prototype.indexFromSetName
= function(name
) {
2883 var labels
= this.attr_("labels");
2884 for (var i
= 0; i
< labels
.length
; i
++) {
2885 if (labels
[i
] == name
) return i
;
2890 Dygraph
.addAnnotationRule
= function() {
2891 if (Dygraph
.addedAnnotationCSS
) return;
2893 var rule
= "border: 1px solid black; " +
2894 "background-color: white; " +
2895 "text-align: center;";
2897 var styleSheetElement
= document
.createElement("style");
2898 styleSheetElement
.type
= "text/css";
2899 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
2901 // Find the first style sheet that we can access.
2902 // We may not add a rule to a style sheet from another domain for security
2903 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
2904 // adds its own style sheets from google.com.
2905 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
2906 if (document
.styleSheets
[i
].disabled
) continue;
2907 var mysheet
= document
.styleSheets
[i
];
2909 if (mysheet
.insertRule
) { // Firefox
2910 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
2911 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
2912 } else if (mysheet
.addRule
) { // IE
2913 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
2915 Dygraph
.addedAnnotationCSS
= true;
2918 // Was likely a security exception.
2922 this.warn("Unable to add default annotation CSS rule; display may be off.");
2926 * Create a new canvas element. This is more complex than a simple
2927 * document.createElement("canvas") because of IE and excanvas.
2929 Dygraph
.createCanvas
= function() {
2930 var canvas
= document
.createElement("canvas");
2932 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
2933 if (isIE
&& (typeof(G_vmlCanvasManager
) != 'undefined')) {
2934 canvas
= G_vmlCanvasManager
.initElement(canvas
);
2942 * A wrapper around Dygraph that implements the gviz API.
2943 * @param {Object} container The DOM object the visualization should live in.
2945 Dygraph
.GVizChart
= function(container
) {
2946 this.container
= container
;
2949 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
2950 // Clear out any existing dygraph.
2951 // TODO(danvk): would it make more sense to simply redraw using the current
2952 // date_graph object?
2953 this.container
.innerHTML
= '';
2954 if (typeof(this.date_graph
) != 'undefined') {
2955 this.date_graph
.destroy();
2958 this.date_graph
= new Dygraph(this.container
, data
, options
);
2962 * Google charts compatible setSelection
2963 * Only row selection is supported, all points in the row will be highlighted
2964 * @param {Array} array of the selected cells
2967 Dygraph
.GVizChart
.prototype.setSelection
= function(selection_array
) {
2969 if (selection_array
.length
) {
2970 row
= selection_array
[0].row
;
2972 this.date_graph
.setSelection(row
);
2976 * Google charts compatible getSelection implementation
2977 * @return {Array} array of the selected cells
2980 Dygraph
.GVizChart
.prototype.getSelection
= function() {
2983 var row
= this.date_graph
.getSelection();
2985 if (row
< 0) return selection
;
2988 for (var i
in this.date_graph
.layout_
.datasets
) {
2989 selection
.push({row
: row
, column
: col
});
2996 // Older pages may still use this name.
2997 DateGraph
= Dygraph
;