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_
);
1210 // Save last x position for callbacks.
1211 this.lastx_
= lastx
;
1213 this.updateSelection_();
1217 * Draw dots over the selectied points in the data series. This function
1218 * takes care of cleanup of previously-drawn dots.
1221 Dygraph
.prototype.updateSelection_
= function() {
1222 // Clear the previously drawn vertical, if there is one
1223 var ctx
= this.canvas_
.getContext("2d");
1224 if (this.previousVerticalX_
>= 0) {
1225 // Determine the maximum highlight circle size.
1226 var maxCircleSize
= 0;
1227 var labels
= this.attr_('labels');
1228 for (var i
= 1; i
< labels
.length
; i
++) {
1229 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1230 if (r
> maxCircleSize
) maxCircleSize
= r
;
1232 var px
= this.previousVerticalX_
;
1233 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1234 2 * maxCircleSize
+ 2, this.height_
);
1237 var isOK
= function(x
) { return x
&& !isNaN(x
); };
1239 if (this.selPoints_
.length
> 0) {
1240 var canvasx
= this.selPoints_
[0].canvasx
;
1242 // Set the status message to indicate the selected point(s)
1243 var replace
= this.attr_('xValueFormatter')(this.lastx_
, this) + ":";
1244 var fmtFunc
= this.attr_('yValueFormatter');
1245 var clen
= this.colors_
.length
;
1247 if (this.attr_('showLabelsOnHighlight')) {
1248 // Set the status message to indicate the selected point(s)
1249 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1250 if (!this.attr_("labelsShowZeroValues") && this.selPoints_
[i
].yval
== 0) continue;
1251 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1252 if (this.attr_("labelsSeparateLines")) {
1255 var point
= this.selPoints_
[i
];
1256 var c
= new RGBColor(this.plotter_
.colors
[point
.name
]);
1257 var yval
= fmtFunc(point
.yval
);
1258 replace
+= " <b><font color='" + c
.toHex() + "'>"
1259 + point
.name
+ "</font></b>:"
1263 this.attr_("labelsDiv").innerHTML
= replace
;
1266 // Draw colored circles over the center of each selected point
1268 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1269 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1271 this.attr_('highlightCircleSize', this.selPoints_
[i
].name
);
1273 ctx
.fillStyle
= this.plotter_
.colors
[this.selPoints_
[i
].name
];
1274 ctx
.arc(canvasx
, this.selPoints_
[i
].canvasy
, circleSize
,
1275 0, 2 * Math
.PI
, false);
1280 this.previousVerticalX_
= canvasx
;
1285 * Set manually set selected dots, and display information about them
1286 * @param int row number that should by highlighted
1287 * false value clears the selection
1290 Dygraph
.prototype.setSelection
= function(row
) {
1291 // Extract the points we've selected
1292 this.selPoints_
= [];
1295 if (row
!== false) {
1296 row
= row
-this.boundaryIds_
[0][0];
1299 if (row
!== false && row
>= 0) {
1300 for (var i
in this.layout_
.datasets
) {
1301 if (row
< this.layout_
.datasets
[i
].length
) {
1302 var point
= this.layout_
.points
[pos
+row
];
1304 if (this.attr_("stackedGraph")) {
1305 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1308 this.selPoints_
.push(point
);
1310 pos
+= this.layout_
.datasets
[i
].length
;
1314 if (this.selPoints_
.length
) {
1315 this.lastx_
= this.selPoints_
[0].xval
;
1316 this.updateSelection_();
1319 this.clearSelection();
1325 * The mouse has left the canvas. Clear out whatever artifacts remain
1326 * @param {Object} event the mouseout event from the browser.
1329 Dygraph
.prototype.mouseOut_
= function(event
) {
1330 if (this.attr_("unhighlightCallback")) {
1331 this.attr_("unhighlightCallback")(event
);
1334 if (this.attr_("hideOverlayOnMouseOut")) {
1335 this.clearSelection();
1340 * Remove all selection from the canvas
1343 Dygraph
.prototype.clearSelection
= function() {
1344 // Get rid of the overlay data
1345 var ctx
= this.canvas_
.getContext("2d");
1346 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1347 this.attr_("labelsDiv").innerHTML
= "";
1348 this.selPoints_
= [];
1353 * Returns the number of the currently selected row
1354 * @return int row number, of -1 if nothing is selected
1357 Dygraph
.prototype.getSelection
= function() {
1358 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1362 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1363 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1364 return row
+ this.boundaryIds_
[0][0];
1370 Dygraph
.zeropad
= function(x
) {
1371 if (x
< 10) return "0" + x
; else return "" + x
;
1375 * Return a string version of the hours, minutes and seconds portion of a date.
1376 * @param {Number} date The JavaScript date (ms since epoch)
1377 * @return {String} A time of the form "HH:MM:SS"
1380 Dygraph
.hmsString_
= function(date
) {
1381 var zeropad
= Dygraph
.zeropad
;
1382 var d
= new Date(date
);
1383 if (d
.getSeconds()) {
1384 return zeropad(d
.getHours()) + ":" +
1385 zeropad(d
.getMinutes()) + ":" +
1386 zeropad(d
.getSeconds());
1388 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
1393 * Convert a JS date to a string appropriate to display on an axis that
1394 * is displaying values at the stated granularity.
1395 * @param {Date} date The date to format
1396 * @param {Number} granularity One of the Dygraph granularity constants
1397 * @return {String} The formatted date
1400 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1401 if (granularity
>= Dygraph
.MONTHLY
) {
1402 return date
.strftime('%b %y');
1404 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1405 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1406 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1408 return Dygraph
.hmsString_(date
.getTime());
1414 * Convert a JS date (millis since epoch) to YYYY/MM/DD
1415 * @param {Number} date The JavaScript date (ms since epoch)
1416 * @return {String} A date of the form "YYYY/MM/DD"
1419 Dygraph
.dateString_
= function(date
, self
) {
1420 var zeropad
= Dygraph
.zeropad
;
1421 var d
= new Date(date
);
1424 var year
= "" + d
.getFullYear();
1425 // Get a 0 padded month string
1426 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
1427 // Get a 0 padded day string
1428 var day
= zeropad(d
.getDate());
1431 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1432 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
1434 return year
+ "/" + month + "/" + day
+ ret
;
1438 * Round a number to the specified number of digits past the decimal point.
1439 * @param {Number} num The number to round
1440 * @param {Number} places The number of decimals to which to round
1441 * @return {Number} The rounded number
1444 Dygraph
.round_
= function(num
, places
) {
1445 var shift
= Math
.pow(10, places
);
1446 return Math
.round(num
* shift
)/shift
;
1450 * Fires when there's data available to be graphed.
1451 * @param {String} data Raw CSV data to be plotted
1454 Dygraph
.prototype.loadedEvent_
= function(data
) {
1455 this.rawData_
= this.parseCSV_(data
);
1459 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1460 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1461 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1464 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1467 Dygraph
.prototype.addXTicks_
= function() {
1468 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1469 var startDate
, endDate
;
1470 if (this.dateWindow_
) {
1471 startDate
= this.dateWindow_
[0];
1472 endDate
= this.dateWindow_
[1];
1474 startDate
= this.rawData_
[0][0];
1475 endDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1478 var xTicks
= this.attr_('xTicker')(startDate
, endDate
, this);
1479 this.layout_
.updateOptions({xTicks
: xTicks
});
1482 // Time granularity enumeration
1483 Dygraph
.SECONDLY
= 0;
1484 Dygraph
.TWO_SECONDLY
= 1;
1485 Dygraph
.FIVE_SECONDLY
= 2;
1486 Dygraph
.TEN_SECONDLY
= 3;
1487 Dygraph
.THIRTY_SECONDLY
= 4;
1488 Dygraph
.MINUTELY
= 5;
1489 Dygraph
.TWO_MINUTELY
= 6;
1490 Dygraph
.FIVE_MINUTELY
= 7;
1491 Dygraph
.TEN_MINUTELY
= 8;
1492 Dygraph
.THIRTY_MINUTELY
= 9;
1493 Dygraph
.HOURLY
= 10;
1494 Dygraph
.TWO_HOURLY
= 11;
1495 Dygraph
.SIX_HOURLY
= 12;
1497 Dygraph
.WEEKLY
= 14;
1498 Dygraph
.MONTHLY
= 15;
1499 Dygraph
.QUARTERLY
= 16;
1500 Dygraph
.BIANNUAL
= 17;
1501 Dygraph
.ANNUAL
= 18;
1502 Dygraph
.DECADAL
= 19;
1503 Dygraph
.NUM_GRANULARITIES
= 20;
1505 Dygraph
.SHORT_SPACINGS
= [];
1506 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1507 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1508 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1509 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1510 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1511 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1512 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1513 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1514 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1515 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1516 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1517 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1518 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1519 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1520 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1524 // If we used this time granularity, how many ticks would there be?
1525 // This is only an approximation, but it's generally good enough.
1527 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1528 if (granularity
< Dygraph
.MONTHLY
) {
1529 // Generate one tick mark for every fixed interval of time.
1530 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1531 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1533 var year_mod
= 1; // e.g. to only print one point every 10 years.
1534 var num_months
= 12;
1535 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1536 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1537 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1538 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1540 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1541 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1542 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1548 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1549 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1551 // Returns an array containing {v: millis, label: label} dictionaries.
1553 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1554 var formatter
= this.attr_("xAxisLabelFormatter");
1556 if (granularity
< Dygraph
.MONTHLY
) {
1557 // Generate one tick mark for every fixed interval of time.
1558 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1559 var format
= '%d%b'; // e.g. "1Jan"
1561 // Find a time less than start_time which occurs on a "nice" time boundary
1562 // for this granularity.
1563 var g
= spacing
/ 1000;
1564 var d
= new Date(start_time
);
1565 if (g
<= 60) { // seconds
1566 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1570 if (g
<= 60) { // minutes
1571 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1576 if (g
<= 24) { // days
1577 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1582 if (g
== 7) { // one week
1583 d
.setDate(d
.getDate() - d
.getDay());
1588 start_time
= d
.getTime();
1590 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1591 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1594 // Display a tick mark on the first of a set of months of each year.
1595 // Years get a tick mark iff y % year_mod == 0. This is useful for
1596 // displaying a tick mark once every 10 years, say, on long time scales.
1598 var year_mod
= 1; // e.g. to only print one point every 10 years.
1600 if (granularity
== Dygraph
.MONTHLY
) {
1601 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1602 } else if (granularity
== Dygraph
.QUARTERLY
) {
1603 months
= [ 0, 3, 6, 9 ];
1604 } else if (granularity
== Dygraph
.BIANNUAL
) {
1606 } else if (granularity
== Dygraph
.ANNUAL
) {
1608 } else if (granularity
== Dygraph
.DECADAL
) {
1613 var start_year
= new Date(start_time
).getFullYear();
1614 var end_year
= new Date(end_time
).getFullYear();
1615 var zeropad
= Dygraph
.zeropad
;
1616 for (var i
= start_year
; i
<= end_year
; i
++) {
1617 if (i
% year_mod
!= 0) continue;
1618 for (var j
= 0; j
< months
.length
; j
++) {
1619 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1620 var t
= Date
.parse(date_str
);
1621 if (t
< start_time
|| t
> end_time
) continue;
1622 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1632 * Add ticks to the x-axis based on a date range.
1633 * @param {Number} startDate Start of the date window (millis since epoch)
1634 * @param {Number} endDate End of the date window (millis since epoch)
1635 * @return {Array.<Object>} Array of {label, value} tuples.
1638 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1640 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1641 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1642 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1649 return self
.GetXAxis(startDate
, endDate
, chosen
);
1651 // TODO(danvk): signal error.
1656 * Add ticks when the x axis has numbers on it (instead of dates)
1657 * @param {Number} startDate Start of the date window (millis since epoch)
1658 * @param {Number} endDate End of the date window (millis since epoch)
1660 * @param {function} attribute accessor function.
1661 * @return {Array.<Object>} Array of {label, value} tuples.
1664 Dygraph
.numericTicks
= function(minV
, maxV
, self
, axis_props
, vals
) {
1665 var attr
= function(k
) {
1666 if (axis_props
&& axis_props
.hasOwnProperty(k
)) return axis_props
[k
];
1667 return self
.attr_(k
);
1672 for (var i
= 0; i
< vals
.length
; i
++) {
1673 ticks
.push({v
: vals
[i
]});
1677 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1678 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1679 // The first spacing greater than pixelsPerYLabel is what we use.
1680 // TODO(danvk): version that works on a log scale.
1681 if (attr("labelsKMG2")) {
1682 var mults
= [1, 2, 4, 8];
1684 var mults
= [1, 2, 5];
1686 var scale
, low_val
, high_val
, nTicks
;
1687 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1688 var pixelsPerTick
= attr('pixelsPerYLabel');
1689 for (var i
= -10; i
< 50; i
++) {
1690 if (attr("labelsKMG2")) {
1691 var base_scale
= Math
.pow(16, i
);
1693 var base_scale
= Math
.pow(10, i
);
1695 for (var j
= 0; j
< mults
.length
; j
++) {
1696 scale
= base_scale
* mults
[j
];
1697 low_val
= Math
.floor(minV
/ scale
) * scale
;
1698 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1699 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
1700 var spacing
= self
.height_
/ nTicks
;
1701 // wish I could break out of both loops at once...
1702 if (spacing
> pixelsPerTick
) break;
1704 if (spacing
> pixelsPerTick
) break;
1707 // Construct the set of ticks.
1708 // Allow reverse y-axis if it's explicitly requested.
1709 if (low_val
> high_val
) scale
*= -1;
1710 for (var i
= 0; i
< nTicks
; i
++) {
1711 var tickV
= low_val
+ i
* scale
;
1712 ticks
.push( {v
: tickV
} );
1716 // Add formatted labels to the ticks.
1719 if (attr("labelsKMB")) {
1721 k_labels
= [ "K", "M", "B", "T" ];
1723 if (attr("labelsKMG2")) {
1724 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1726 k_labels
= [ "k", "M", "G", "T" ];
1728 var formatter
= attr('yAxisLabelFormatter') ? attr('yAxisLabelFormatter') : attr('yValueFormatter');
1730 for (var i
= 0; i
< ticks
.length
; i
++) {
1731 var tickV
= ticks
[i
].v
;
1732 var absTickV
= Math
.abs(tickV
);
1734 if (formatter
!= undefined
) {
1735 label
= formatter(tickV
);
1737 label
= Dygraph
.round_(tickV
, 2);
1739 if (k_labels
.length
) {
1740 // Round up to an appropriate unit.
1742 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
1743 if (absTickV
>= n
) {
1744 label
= Dygraph
.round_(tickV
/ n
, 1) + k_labels
[j
];
1749 ticks
[i
].label
= label
;
1754 // Computes the range of the data series (including confidence intervals).
1755 // series is either [ [x1, y1], [x2, y2], ... ] or
1756 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1757 // Returns [low, high]
1758 Dygraph
.prototype.extremeValues_
= function(series
) {
1759 var minY
= null, maxY
= null;
1761 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1763 // With custom bars, maxY is the max of the high values.
1764 for (var j
= 0; j
< series
.length
; j
++) {
1765 var y
= series
[j
][1][0];
1767 var low
= y
- series
[j
][1][1];
1768 var high
= y
+ series
[j
][1][2];
1769 if (low
> y
) low
= y
; // this can happen with custom bars,
1770 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1771 if (maxY
== null || high
> maxY
) {
1774 if (minY
== null || low
< minY
) {
1779 for (var j
= 0; j
< series
.length
; j
++) {
1780 var y
= series
[j
][1];
1781 if (y
=== null || isNaN(y
)) continue;
1782 if (maxY
== null || y
> maxY
) {
1785 if (minY
== null || y
< minY
) {
1791 return [minY
, maxY
];
1795 * This function is called once when the chart's data is changed or the options
1796 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1797 * idea is that values derived from the chart's data can be computed here,
1798 * rather than every time the chart is drawn. This includes things like the
1799 * number of axes, rolling averages, etc.
1801 Dygraph
.prototype.predraw_
= function() {
1802 // TODO(danvk): move more computations out of drawGraph_ and into here.
1803 this.computeYAxes_();
1805 // Create a new plotter.
1806 if (this.plotter_
) this.plotter_
.clear();
1807 this.plotter_
= new DygraphCanvasRenderer(this,
1808 this.hidden_
, this.layout_
,
1809 this.renderOptions_
);
1811 // The roller sits in the bottom left corner of the chart. We don't know where
1812 // this will be until the options are available, so it's positioned here.
1813 this.createRollInterface_();
1815 // Same thing applies for the labelsDiv. It's right edge should be flush with
1816 // the right edge of the charting area (which may not be the same as the right
1817 // edge of the div, if we have two y-axes.
1818 this.positionLabelsDiv_();
1820 // If the data or options have changed, then we'd better redraw.
1826 * Update the graph with new data. This method is called when the viewing area
1827 * has changed. If the underlying data or options have changed, predraw_ will
1828 * be called before drawGraph_ is called.
1831 Dygraph
.prototype.drawGraph_
= function() {
1832 var data
= this.rawData_
;
1834 // This is used to set the second parameter to drawCallback, below.
1835 var is_initial_draw
= this.is_initial_draw_
;
1836 this.is_initial_draw_
= false;
1838 var minY
= null, maxY
= null;
1839 this.layout_
.removeAllDatasets();
1841 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
1843 // Loop over the fields (series). Go from the last to the first,
1844 // because if they're stacked that's how we accumulate the values.
1846 var cumulative_y
= []; // For stacked series.
1849 var extremes
= {}; // series name -> [low, high]
1851 // Loop over all fields and create datasets
1852 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
1853 if (!this.visibility()[i
- 1]) continue;
1855 var seriesName
= this.attr_("labels")[i
];
1856 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
1859 for (var j
= 0; j
< data
.length
; j
++) {
1860 if (data
[j
][i
] != null || !connectSeparatedPoints
) {
1861 var date
= data
[j
][0];
1862 series
.push([date
, data
[j
][i
]]);
1866 // TODO(danvk): move this into predraw_. It's insane to do it here.
1867 series
= this.rollingAverage(series
, this.rollPeriod_
);
1869 // Prune down to the desired range, if necessary (for zooming)
1870 // Because there can be lines going to points outside of the visible area,
1871 // we actually prune to visible points, plus one on either side.
1872 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1873 if (this.dateWindow_
) {
1874 var low
= this.dateWindow_
[0];
1875 var high
= this.dateWindow_
[1];
1877 // TODO(danvk): do binary search instead of linear search.
1878 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1879 var firstIdx
= null, lastIdx
= null;
1880 for (var k
= 0; k
< series
.length
; k
++) {
1881 if (series
[k
][0] >= low
&& firstIdx
=== null) {
1884 if (series
[k
][0] <= high
) {
1888 if (firstIdx
=== null) firstIdx
= 0;
1889 if (firstIdx
> 0) firstIdx
--;
1890 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
1891 if (lastIdx
< series
.length
- 1) lastIdx
++;
1892 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
1893 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
1894 pruned
.push(series
[k
]);
1898 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
1901 var seriesExtremes
= this.extremeValues_(series
);
1904 for (var j
=0; j
<series
.length
; j
++) {
1905 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
1908 } else if (this.attr_("stackedGraph")) {
1909 var l
= series
.length
;
1911 for (var j
= 0; j
< l
; j
++) {
1912 // If one data set has a NaN, let all subsequent stacked
1913 // sets inherit the NaN -- only start at 0 for the first set.
1914 var x
= series
[j
][0];
1915 if (cumulative_y
[x
] === undefined
) {
1916 cumulative_y
[x
] = 0;
1919 actual_y
= series
[j
][1];
1920 cumulative_y
[x
] += actual_y
;
1922 series
[j
] = [x
, cumulative_y
[x
]]
1924 if (cumulative_y
[x
] > seriesExtremes
[1]) {
1925 seriesExtremes
[1] = cumulative_y
[x
];
1927 if (cumulative_y
[x
] < seriesExtremes
[0]) {
1928 seriesExtremes
[0] = cumulative_y
[x
];
1932 extremes
[seriesName
] = seriesExtremes
;
1934 datasets
[i
] = series
;
1937 for (var i
= 1; i
< datasets
.length
; i
++) {
1938 if (!this.visibility()[i
- 1]) continue;
1939 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
1942 // TODO(danvk): this method doesn't need to return anything.
1943 var out
= this.computeYAxisRanges_(extremes
);
1945 var seriesToAxisMap
= out
[1];
1946 this.layout_
.updateOptions( { yAxes
: axes
,
1947 seriesToAxisMap
: seriesToAxisMap
1952 // Tell PlotKit to use this new data and render itself
1953 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
1954 this.layout_
.evaluateWithError();
1955 this.plotter_
.clear();
1956 this.plotter_
.render();
1957 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
1958 this.canvas_
.height
);
1960 if (this.attr_("drawCallback") !== null) {
1961 this.attr_("drawCallback")(this, is_initial_draw
);
1966 * Determine properties of the y-axes which are independent of the data
1967 * currently being displayed. This includes things like the number of axes and
1968 * the style of the axes. It does not include the range of each axis and its
1970 * This fills in this.axes_ and this.seriesToAxisMap_.
1971 * axes_ = [ { options } ]
1972 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
1973 * indices are into the axes_ array.
1975 Dygraph
.prototype.computeYAxes_
= function() {
1976 this.axes_
= [{}]; // always have at least one y-axis.
1977 this.seriesToAxisMap_
= {};
1979 // Get a list of series names.
1980 var labels
= this.attr_("labels");
1982 for (var i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
1984 // all options which could be applied per-axis:
1992 'axisLabelFontSize',
1996 // Copy global axis options over to the first axis.
1997 for (var i
= 0; i
< axisOptions
.length
; i
++) {
1998 var k
= axisOptions
[i
];
1999 var v
= this.attr_(k
);
2000 if (v
) this.axes_
[0][k
] = v
;
2003 // Go through once and add all the axes.
2004 for (var seriesName
in series
) {
2005 if (!series
.hasOwnProperty(seriesName
)) continue;
2006 var axis
= this.attr_("axis", seriesName
);
2008 this.seriesToAxisMap_
[seriesName
] = 0;
2011 if (typeof(axis
) == 'object') {
2012 // Add a new axis, making a copy of its per-axis options.
2014 Dygraph
.update(opts
, this.axes_
[0]);
2015 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2016 Dygraph
.update(opts
, axis
);
2017 this.axes_
.push(opts
);
2018 this.seriesToAxisMap_
[seriesName
] = this.axes_
.length
- 1;
2022 // Go through one more time and assign series to an axis defined by another
2023 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2024 for (var seriesName
in series
) {
2025 if (!series
.hasOwnProperty(seriesName
)) continue;
2026 var axis
= this.attr_("axis", seriesName
);
2027 if (typeof(axis
) == 'string') {
2028 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2029 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2030 "series " + axis
+ ", which does not define its own axis.");
2033 var idx
= this.seriesToAxisMap_
[axis
];
2034 this.seriesToAxisMap_
[seriesName
] = idx
;
2038 // Now we remove series from seriesToAxisMap_ which are not visible. We do
2039 // this last so that hiding the first series doesn't destroy the axis
2040 // properties of the primary axis.
2041 var seriesToAxisFiltered
= {};
2042 var vis
= this.visibility();
2043 for (var i
= 1; i
< labels
.length
; i
++) {
2045 if (vis
[i
- 1]) seriesToAxisFiltered
[s
] = this.seriesToAxisMap_
[s
];
2047 this.seriesToAxisMap_
= seriesToAxisFiltered
;
2051 * Returns the number of y-axes on the chart.
2052 * @return {Number} the number of axes.
2054 Dygraph
.prototype.numAxes
= function() {
2056 for (var series
in this.seriesToAxisMap_
) {
2057 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2058 var idx
= this.seriesToAxisMap_
[series
];
2059 if (idx
> last_axis
) last_axis
= idx
;
2061 return 1 + last_axis
;
2065 * Determine the value range and tick marks for each axis.
2066 * @param {Object} extremes A mapping from seriesName -> [low, high]
2067 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2069 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2070 // Build a map from axis number -> [list of series names]
2071 var seriesForAxis
= [];
2072 for (var series
in this.seriesToAxisMap_
) {
2073 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2074 var idx
= this.seriesToAxisMap_
[series
];
2075 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2076 seriesForAxis
[idx
].push(series
);
2079 // Compute extreme values, a span and tick marks for each axis.
2080 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2081 var axis
= this.axes_
[i
];
2082 if (axis
.valueWindow
) {
2083 // This is only set if the user has zoomed on the y-axis. It is never set
2084 // by a user. It takes precedence over axis.valueRange because, if you set
2085 // valueRange, you'd still expect to be able to pan.
2086 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2087 } else if (axis
.valueRange
) {
2088 // This is a user-set value range for this axis.
2089 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2091 // Calculate the extremes of extremes.
2092 var series
= seriesForAxis
[i
];
2093 var minY
= Infinity
; // extremes[series[0]][0];
2094 var maxY
= -Infinity
; // extremes[series[0]][1];
2095 for (var j
= 0; j
< series
.length
; j
++) {
2096 minY
= Math
.min(extremes
[series
[j
]][0], minY
);
2097 maxY
= Math
.max(extremes
[series
[j
]][1], maxY
);
2099 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2101 // Add some padding and round up to an integer to be human-friendly.
2102 var span
= maxY
- minY
;
2103 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2104 if (span
== 0) { span
= maxY
; }
2105 var maxAxisY
= maxY
+ 0.1 * span
;
2106 var minAxisY
= minY
- 0.1 * span
;
2108 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2109 if (!this.attr_("avoidMinZero")) {
2110 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2111 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2114 if (this.attr_("includeZero")) {
2115 if (maxY
< 0) maxAxisY
= 0;
2116 if (minY
> 0) minAxisY
= 0;
2119 axis
.computedValueRange
= [minAxisY
, maxAxisY
];
2122 // Add ticks. By default, all axes inherit the tick positions of the
2123 // primary axis. However, if an axis is specifically marked as having
2124 // independent ticks, then that is permissible as well.
2125 if (i
== 0 || axis
.independentTicks
) {
2127 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2128 axis
.computedValueRange
[1],
2132 var p_axis
= this.axes_
[0];
2133 var p_ticks
= p_axis
.ticks
;
2134 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2135 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2136 var tick_values
= [];
2137 for (var i
= 0; i
< p_ticks
.length
; i
++) {
2138 var y_frac
= (p_ticks
[i
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2139 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2140 tick_values
.push(y_val
);
2144 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2145 axis
.computedValueRange
[1],
2146 this, axis
, tick_values
);
2150 return [this.axes_
, this.seriesToAxisMap_
];
2154 * Calculates the rolling average of a data set.
2155 * If originalData is [label, val], rolls the average of those.
2156 * If originalData is [label, [, it's interpreted as [value, stddev]
2157 * and the roll is returned in the same form, with appropriately reduced
2158 * stddev for each value.
2159 * Note that this is where fractional input (i.e. '5/10') is converted into
2161 * @param {Array} originalData The data in the appropriate format (see above)
2162 * @param {Number} rollPeriod The number of days over which to average the data
2164 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2165 if (originalData
.length
< 2)
2166 return originalData
;
2167 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
2168 var rollingData
= [];
2169 var sigma
= this.attr_("sigma");
2171 if (this.fractions_
) {
2173 var den
= 0; // numerator/denominator
2175 for (var i
= 0; i
< originalData
.length
; i
++) {
2176 num
+= originalData
[i
][1][0];
2177 den
+= originalData
[i
][1][1];
2178 if (i
- rollPeriod
>= 0) {
2179 num
-= originalData
[i
- rollPeriod
][1][0];
2180 den
-= originalData
[i
- rollPeriod
][1][1];
2183 var date
= originalData
[i
][0];
2184 var value
= den
? num
/ den
: 0.0;
2185 if (this.attr_("errorBars")) {
2186 if (this.wilsonInterval_
) {
2187 // For more details on this confidence interval, see:
2188 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2190 var p
= value
< 0 ? 0 : value
, n
= den
;
2191 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2192 var denom
= 1 + sigma
* sigma
/ den
;
2193 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2194 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2195 rollingData
[i
] = [date
,
2196 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2198 rollingData
[i
] = [date
, [0, 0, 0]];
2201 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2202 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2205 rollingData
[i
] = [date
, mult
* value
];
2208 } else if (this.attr_("customBars")) {
2213 for (var i
= 0; i
< originalData
.length
; i
++) {
2214 var data
= originalData
[i
][1];
2216 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2218 if (y
!= null && !isNaN(y
)) {
2224 if (i
- rollPeriod
>= 0) {
2225 var prev
= originalData
[i
- rollPeriod
];
2226 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
2233 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2234 1.0 * (mid
- low
) / count
,
2235 1.0 * (high
- mid
) / count
]];
2238 // Calculate the rolling average for the first rollPeriod - 1 points where
2239 // there is not enough data to roll over the full number of days
2240 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
2241 if (!this.attr_("errorBars")){
2242 if (rollPeriod
== 1) {
2243 return originalData
;
2246 for (var i
= 0; i
< originalData
.length
; i
++) {
2249 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2250 var y
= originalData
[j
][1];
2251 if (y
== null || isNaN(y
)) continue;
2253 sum
+= originalData
[j
][1];
2256 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2258 rollingData
[i
] = [originalData
[i
][0], null];
2263 for (var i
= 0; i
< originalData
.length
; i
++) {
2267 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2268 var y
= originalData
[j
][1][0];
2269 if (y
== null || isNaN(y
)) continue;
2271 sum
+= originalData
[j
][1][0];
2272 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2275 var stddev
= Math
.sqrt(variance
) / num_ok
;
2276 rollingData
[i
] = [originalData
[i
][0],
2277 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2279 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2289 * Parses a date, returning the number of milliseconds since epoch. This can be
2290 * passed in as an xValueParser in the Dygraph constructor.
2291 * TODO(danvk): enumerate formats that this understands.
2292 * @param {String} A date in YYYYMMDD format.
2293 * @return {Number} Milliseconds since epoch.
2296 Dygraph
.dateParser
= function(dateStr
, self
) {
2299 if (dateStr
.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12'
2300 dateStrSlashed
= dateStr
.replace("-", "/", "g");
2301 while (dateStrSlashed
.search("-") != -1) {
2302 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
2304 d
= Date
.parse(dateStrSlashed
);
2305 } else if (dateStr
.length
== 8) { // e.g. '20090712'
2306 // TODO(danvk): remove support for this format. It's confusing.
2307 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
2308 + "/" + dateStr
.substr(6,2);
2309 d
= Date
.parse(dateStrSlashed
);
2311 // Any format that Date.parse will accept, e.g. "2009/07/12" or
2312 // "2009/07/12 12:34:56"
2313 d
= Date
.parse(dateStr
);
2316 if (!d
|| isNaN(d
)) {
2317 self
.error("Couldn't parse " + dateStr
+ " as a date");
2323 * Detects the type of the str (date or numeric) and sets the various
2324 * formatting attributes in this.attrs_ based on this type.
2325 * @param {String} str An x value.
2328 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2330 if (str
.indexOf('-') >= 0 ||
2331 str
.indexOf('/') >= 0 ||
2332 isNaN(parseFloat(str
))) {
2334 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2335 // TODO(danvk): remove support for this format.
2340 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2341 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2342 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2343 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2345 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2346 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2347 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2348 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2353 * Parses a string in a special csv format. We expect a csv file where each
2354 * line is a date point, and the first field in each line is the date string.
2355 * We also expect that all remaining fields represent series.
2356 * if the errorBars attribute is set, then interpret the fields as:
2357 * date, series1, stddev1, series2, stddev2, ...
2358 * @param {Array.<Object>} data See above.
2361 * @return Array.<Object> An array with one entry for each row. These entries
2362 * are an array of cells in that row. The first entry is the parsed x-value for
2363 * the row. The second, third, etc. are the y-values. These can take on one of
2364 * three forms, depending on the CSV and constructor parameters:
2366 * 2. [ value, stddev ]
2367 * 3. [ low value, center value, high value ]
2369 Dygraph
.prototype.parseCSV_
= function(data
) {
2371 var lines
= data
.split("\n");
2373 // Use the default delimiter or fall back to a tab if that makes sense.
2374 var delim
= this.attr_('delimiter');
2375 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2380 if (this.labelsFromCSV_
) {
2382 this.attrs_
.labels
= lines
[0].split(delim
);
2385 // Parse the x as a float or return null if it's not a number.
2386 var parseFloatOrNull
= function(x
) {
2387 var val
= parseFloat(x
);
2388 return isNaN(val
) ? null : val
;
2392 var defaultParserSet
= false; // attempt to auto-detect x value type
2393 var expectedCols
= this.attr_("labels").length
;
2394 var outOfOrder
= false;
2395 for (var i
= start
; i
< lines
.length
; i
++) {
2396 var line
= lines
[i
];
2397 if (line
.length
== 0) continue; // skip blank lines
2398 if (line
[0] == '#') continue; // skip comment lines
2399 var inFields
= line
.split(delim
);
2400 if (inFields
.length
< 2) continue;
2403 if (!defaultParserSet
) {
2404 this.detectTypeFromString_(inFields
[0]);
2405 xParser
= this.attr_("xValueParser");
2406 defaultParserSet
= true;
2408 fields
[0] = xParser(inFields
[0], this);
2410 // If fractions are expected, parse the numbers as "A/B
"
2411 if (this.fractions_) {
2412 for (var j = 1; j < inFields.length; j++) {
2413 // TODO(danvk): figure out an appropriate way to flag parse errors.
2414 var vals = inFields[j].split("/");
2415 fields[j] = [parseFloatOrNull(vals[0]), parseFloatOrNull(vals[1])];
2417 } else if (this.attr_("errorBars
")) {
2418 // If there are error bars, values are (value, stddev) pairs
2419 for (var j = 1; j < inFields.length; j += 2)
2420 fields[(j + 1) / 2] = [parseFloatOrNull(inFields[j]),
2421 parseFloatOrNull(inFields[j + 1])];
2422 } else if (this.attr_("customBars
")) {
2423 // Bars are a low;center;high tuple
2424 for (var j = 1; j < inFields.length; j++) {
2425 var vals = inFields[j].split(";");
2426 fields[j] = [ parseFloatOrNull(vals[0]),
2427 parseFloatOrNull(vals[1]),
2428 parseFloatOrNull(vals[2]) ];
2431 // Values are just numbers
2432 for (var j = 1; j < inFields.length; j++) {
2433 fields[j] = parseFloatOrNull(inFields[j]);
2436 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2441 if (fields.length != expectedCols) {
2442 this.error("Number of columns
in line
" + i + " (" + fields.length +
2443 ") does not agree
with number of
labels (" + expectedCols +
2449 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2450 ret.sort(function(a,b) { return a[0] - b[0] });
2457 * The user has provided their data as a pre-packaged JS array. If the x values
2458 * are numeric, this is the same as dygraphs' internal format. If the x values
2459 * are dates, we need to convert them from Date objects to ms since epoch.
2460 * @param {Array.<Object>} data
2461 * @return {Array.<Object>} data with numeric x values.
2463 Dygraph.prototype.parseArray_ = function(data) {
2464 // Peek at the first x value to see if it's numeric.
2465 if (data.length == 0) {
2466 this.error("Can
't plot empty data set");
2469 if (data[0].length == 0) {
2470 this.error("Data set cannot contain an empty row");
2474 if (this.attr_("labels") == null) {
2475 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2476 "in the options parameter");
2477 this.attrs_.labels = [ "X" ];
2478 for (var i = 1; i < data[0].length; i++) {
2479 this.attrs_.labels.push("Y" + i);
2483 if (Dygraph.isDateLike(data[0][0])) {
2484 // Some intelligent defaults for a date x-axis.
2485 this.attrs_.xValueFormatter = Dygraph.dateString_;
2486 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
2487 this.attrs_.xTicker = Dygraph.dateTicker;
2489 // Assume they're all dates
.
2490 var parsedData
= Dygraph
.clone(data
);
2491 for (var i
= 0; i
< data
.length
; i
++) {
2492 if (parsedData
[i
].length
== 0) {
2493 this.error("Row " + (1 + i
) + " of data is empty");
2496 if (parsedData
[i
][0] == null
2497 || typeof(parsedData
[i
][0].getTime
) != 'function'
2498 || isNaN(parsedData
[i
][0].getTime())) {
2499 this.error("x value in row " + (1 + i
) + " is not a Date");
2502 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2506 // Some intelligent defaults for a numeric x-axis.
2507 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2508 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2514 * Parses a DataTable object from gviz.
2515 * The data is expected to have a first column that is either a date or a
2516 * number. All subsequent columns must be numbers. If there is a clear mismatch
2517 * between this.xValueParser_ and the type of the first column, it will be
2518 * fixed. Fills out rawData_.
2519 * @param {Array.<Object>} data See above.
2522 Dygraph
.prototype.parseDataTable_
= function(data
) {
2523 var cols
= data
.getNumberOfColumns();
2524 var rows
= data
.getNumberOfRows();
2526 var indepType
= data
.getColumnType(0);
2527 if (indepType
== 'date' || indepType
== 'datetime') {
2528 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2529 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2530 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2531 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2532 } else if (indepType
== 'number') {
2533 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2534 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2535 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2536 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2538 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2539 "column 1 of DataTable input (Got '" + indepType
+ "')");
2543 // Array of the column indices which contain data (and not annotations).
2545 var annotationCols
= {}; // data index -> [annotation cols]
2546 var hasAnnotations
= false;
2547 for (var i
= 1; i
< cols
; i
++) {
2548 var type
= data
.getColumnType(i
);
2549 if (type
== 'number') {
2551 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2552 // This is OK -- it's an annotation column.
2553 var dataIdx
= colIdx
[colIdx
.length
- 1];
2554 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2555 annotationCols
[dataIdx
] = [i
];
2557 annotationCols
[dataIdx
].push(i
);
2559 hasAnnotations
= true;
2561 this.error("Only 'number' is supported as a dependent type with Gviz." +
2562 " 'string' is only supported if displayAnnotations is true");
2566 // Read column labels
2567 // TODO(danvk): add support back for errorBars
2568 var labels
= [data
.getColumnLabel(0)];
2569 for (var i
= 0; i
< colIdx
.length
; i
++) {
2570 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2571 if (this.attr_("errorBars")) i
+= 1;
2573 this.attrs_
.labels
= labels
;
2574 cols
= labels
.length
;
2577 var outOfOrder
= false;
2578 var annotations
= [];
2579 for (var i
= 0; i
< rows
; i
++) {
2581 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2582 data
.getValue(i
, 0) === null) {
2583 this.warn("Ignoring row " + i
+
2584 " of DataTable because of undefined or null first column.");
2588 if (indepType
== 'date' || indepType
== 'datetime') {
2589 row
.push(data
.getValue(i
, 0).getTime());
2591 row
.push(data
.getValue(i
, 0));
2593 if (!this.attr_("errorBars")) {
2594 for (var j
= 0; j
< colIdx
.length
; j
++) {
2595 var col
= colIdx
[j
];
2596 row
.push(data
.getValue(i
, col
));
2597 if (hasAnnotations
&&
2598 annotationCols
.hasOwnProperty(col
) &&
2599 data
.getValue(i
, annotationCols
[col
][0]) != null) {
2601 ann
.series
= data
.getColumnLabel(col
);
2603 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
2605 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2606 if (k
) ann
.text
+= "\n";
2607 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2609 annotations
.push(ann
);
2613 for (var j
= 0; j
< cols
- 1; j
++) {
2614 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2617 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2624 this.warn("DataTable is out of order; order it correctly to speed loading.");
2625 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
2627 this.rawData_
= ret
;
2629 if (annotations
.length
> 0) {
2630 this.setAnnotations(annotations
, true);
2634 // These functions are all based on MochiKit.
2635 Dygraph
.update
= function (self
, o
) {
2636 if (typeof(o
) != 'undefined' && o
!== null) {
2638 if (o
.hasOwnProperty(k
)) {
2646 Dygraph
.isArrayLike
= function (o
) {
2647 var typ
= typeof(o
);
2649 (typ
!= 'object' && !(typ
== 'function' &&
2650 typeof(o
.item
) == 'function')) ||
2652 typeof(o
.length
) != 'number' ||
2660 Dygraph
.isDateLike
= function (o
) {
2661 if (typeof(o
) != "object" || o
=== null ||
2662 typeof(o
.getTime
) != 'function') {
2668 Dygraph
.clone
= function(o
) {
2669 // TODO(danvk): figure out how MochiKit's version works
2671 for (var i
= 0; i
< o
.length
; i
++) {
2672 if (Dygraph
.isArrayLike(o
[i
])) {
2673 r
.push(Dygraph
.clone(o
[i
]));
2683 * Get the CSV data. If it's in a function, call that function. If it's in a
2684 * file, do an XMLHttpRequest to get it.
2687 Dygraph
.prototype.start_
= function() {
2688 if (typeof this.file_
== 'function') {
2689 // CSV string. Pretend we got it via XHR.
2690 this.loadedEvent_(this.file_());
2691 } else if (Dygraph
.isArrayLike(this.file_
)) {
2692 this.rawData_
= this.parseArray_(this.file_
);
2694 } else if (typeof this.file_
== 'object' &&
2695 typeof this.file_
.getColumnRange
== 'function') {
2696 // must be a DataTable from gviz.
2697 this.parseDataTable_(this.file_
);
2699 } else if (typeof this.file_
== 'string') {
2700 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2701 if (this.file_
.indexOf('\n') >= 0) {
2702 this.loadedEvent_(this.file_
);
2704 var req
= new XMLHttpRequest();
2706 req
.onreadystatechange
= function () {
2707 if (req
.readyState
== 4) {
2708 if (req
.status
== 200) {
2709 caller
.loadedEvent_(req
.responseText
);
2714 req
.open("GET", this.file_
, true);
2718 this.error("Unknown data format: " + (typeof this.file_
));
2723 * Changes various properties of the graph. These can include:
2725 * <li>file: changes the source data for the graph</li>
2726 * <li>errorBars: changes whether the data contains stddev</li>
2728 * @param {Object} attrs The new properties and values
2730 Dygraph
.prototype.updateOptions
= function(attrs
) {
2731 // TODO(danvk): this is a mess. Rethink this function.
2732 if ('rollPeriod' in attrs
) {
2733 this.rollPeriod_
= attrs
.rollPeriod
;
2735 if ('dateWindow' in attrs
) {
2736 this.dateWindow_
= attrs
.dateWindow
;
2739 // TODO(danvk): validate per-series options.
2744 // highlightCircleSize
2746 Dygraph
.update(this.user_attrs_
, attrs
);
2747 Dygraph
.update(this.renderOptions_
, attrs
);
2749 this.labelsFromCSV_
= (this.attr_("labels") == null);
2751 // TODO(danvk): this doesn't match the constructor logic
2752 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
2753 if (attrs
['file']) {
2754 this.file_
= attrs
['file'];
2762 * Resizes the dygraph. If no parameters are specified, resizes to fill the
2763 * containing div (which has presumably changed size since the dygraph was
2764 * instantiated. If the width/height are specified, the div will be resized.
2766 * This is far more efficient than destroying and re-instantiating a
2767 * Dygraph, since it doesn't have to reparse the underlying data.
2769 * @param {Number} width Width (in pixels)
2770 * @param {Number} height Height (in pixels)
2772 Dygraph
.prototype.resize
= function(width
, height
) {
2773 if (this.resize_lock
) {
2776 this.resize_lock
= true;
2778 if ((width
=== null) != (height
=== null)) {
2779 this.warn("Dygraph.resize() should be called with zero parameters or " +
2780 "two non-NULL parameters. Pretending it was zero.");
2781 width
= height
= null;
2784 // TODO(danvk): there should be a clear() method.
2785 this.maindiv_
.innerHTML
= "";
2786 this.attrs_
.labelsDiv
= null;
2789 this.maindiv_
.style
.width
= width
+ "px";
2790 this.maindiv_
.style
.height
= height
+ "px";
2791 this.width_
= width
;
2792 this.height_
= height
;
2794 this.width_
= this.maindiv_
.offsetWidth
;
2795 this.height_
= this.maindiv_
.offsetHeight
;
2798 this.createInterface_();
2801 this.resize_lock
= false;
2805 * Adjusts the number of days in the rolling average. Updates the graph to
2806 * reflect the new averaging period.
2807 * @param {Number} length Number of days over which to average the data.
2809 Dygraph
.prototype.adjustRoll
= function(length
) {
2810 this.rollPeriod_
= length
;
2815 * Returns a boolean array of visibility statuses.
2817 Dygraph
.prototype.visibility
= function() {
2818 // Do lazy-initialization, so that this happens after we know the number of
2820 if (!this.attr_("visibility")) {
2821 this.attrs_
["visibility"] = [];
2823 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
2824 this.attr_("visibility").push(true);
2826 return this.attr_("visibility");
2830 * Changes the visiblity of a series.
2832 Dygraph
.prototype.setVisibility
= function(num
, value
) {
2833 var x
= this.visibility();
2834 if (num
< 0 || num
>= x
.length
) {
2835 this.warn("invalid series number in setVisibility: " + num
);
2843 * Update the list of annotations and redraw the chart.
2845 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
2846 // Only add the annotation CSS rule once we know it will be used.
2847 Dygraph
.addAnnotationRule();
2848 this.annotations_
= ann
;
2849 this.layout_
.setAnnotations(this.annotations_
);
2850 if (!suppressDraw
) {
2856 * Return the list of annotations.
2858 Dygraph
.prototype.annotations
= function() {
2859 return this.annotations_
;
2863 * Get the index of a series (column) given its name. The first column is the
2864 * x-axis, so the data series start with index 1.
2866 Dygraph
.prototype.indexFromSetName
= function(name
) {
2867 var labels
= this.attr_("labels");
2868 for (var i
= 0; i
< labels
.length
; i
++) {
2869 if (labels
[i
] == name
) return i
;
2874 Dygraph
.addAnnotationRule
= function() {
2875 if (Dygraph
.addedAnnotationCSS
) return;
2877 var rule
= "border: 1px solid black; " +
2878 "background-color: white; " +
2879 "text-align: center;";
2881 var styleSheetElement
= document
.createElement("style");
2882 styleSheetElement
.type
= "text/css";
2883 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
2885 // Find the first style sheet that we can access.
2886 // We may not add a rule to a style sheet from another domain for security
2887 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
2888 // adds its own style sheets from google.com.
2889 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
2890 if (document
.styleSheets
[i
].disabled
) continue;
2891 var mysheet
= document
.styleSheets
[i
];
2893 if (mysheet
.insertRule
) { // Firefox
2894 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
2895 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
2896 } else if (mysheet
.addRule
) { // IE
2897 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
2899 Dygraph
.addedAnnotationCSS
= true;
2902 // Was likely a security exception.
2906 this.warn("Unable to add default annotation CSS rule; display may be off.");
2910 * Create a new canvas element. This is more complex than a simple
2911 * document.createElement("canvas") because of IE and excanvas.
2913 Dygraph
.createCanvas
= function() {
2914 var canvas
= document
.createElement("canvas");
2916 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
2917 if (isIE
&& (typeof(G_vmlCanvasManager
) != 'undefined')) {
2918 canvas
= G_vmlCanvasManager
.initElement(canvas
);
2926 * A wrapper around Dygraph that implements the gviz API.
2927 * @param {Object} container The DOM object the visualization should live in.
2929 Dygraph
.GVizChart
= function(container
) {
2930 this.container
= container
;
2933 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
2934 // Clear out any existing dygraph.
2935 // TODO(danvk): would it make more sense to simply redraw using the current
2936 // date_graph object?
2937 this.container
.innerHTML
= '';
2938 if (typeof(this.date_graph
) != 'undefined') {
2939 this.date_graph
.destroy();
2942 this.date_graph
= new Dygraph(this.container
, data
, options
);
2946 * Google charts compatible setSelection
2947 * Only row selection is supported, all points in the row will be highlighted
2948 * @param {Array} array of the selected cells
2951 Dygraph
.GVizChart
.prototype.setSelection
= function(selection_array
) {
2953 if (selection_array
.length
) {
2954 row
= selection_array
[0].row
;
2956 this.date_graph
.setSelection(row
);
2960 * Google charts compatible getSelection implementation
2961 * @return {Array} array of the selected cells
2964 Dygraph
.GVizChart
.prototype.getSelection
= function() {
2967 var row
= this.date_graph
.getSelection();
2969 if (row
< 0) return selection
;
2972 for (var i
in this.date_graph
.layout_
.datasets
) {
2973 selection
.push({row
: row
, column
: col
});
2980 // Older pages may still use this name.
2981 DateGraph
= Dygraph
;