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_
);
1207 // Save last x position for callbacks.
1208 this.lastx_
= lastx
;
1210 this.updateSelection_();
1214 * Draw dots over the selectied points in the data series. This function
1215 * takes care of cleanup of previously-drawn dots.
1218 Dygraph
.prototype.updateSelection_
= function() {
1219 // Clear the previously drawn vertical, if there is one
1220 var ctx
= this.canvas_
.getContext("2d");
1221 if (this.previousVerticalX_
>= 0) {
1222 // Determine the maximum highlight circle size.
1223 var maxCircleSize
= 0;
1224 var labels
= this.attr_('labels');
1225 for (var i
= 1; i
< labels
.length
; i
++) {
1226 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1227 if (r
> maxCircleSize
) maxCircleSize
= r
;
1229 var px
= this.previousVerticalX_
;
1230 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1231 2 * maxCircleSize
+ 2, this.height_
);
1234 var isOK
= function(x
) { return x
&& !isNaN(x
); };
1236 if (this.selPoints_
.length
> 0) {
1237 var canvasx
= this.selPoints_
[0].canvasx
;
1239 // Set the status message to indicate the selected point(s)
1240 var replace
= this.attr_('xValueFormatter')(this.lastx_
, this) + ":";
1241 var fmtFunc
= this.attr_('yValueFormatter');
1242 var clen
= this.colors_
.length
;
1244 if (this.attr_('showLabelsOnHighlight')) {
1245 // Set the status message to indicate the selected point(s)
1246 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1247 if (!this.attr_("labelsShowZeroValues") && this.selPoints_
[i
].yval
== 0) continue;
1248 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1249 if (this.attr_("labelsSeparateLines")) {
1252 var point
= this.selPoints_
[i
];
1253 var c
= new RGBColor(this.plotter_
.colors
[point
.name
]);
1254 var yval
= fmtFunc(point
.yval
);
1255 replace
+= " <b><font color='" + c
.toHex() + "'>"
1256 + point
.name
+ "</font></b>:"
1260 this.attr_("labelsDiv").innerHTML
= replace
;
1263 // Draw colored circles over the center of each selected point
1265 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1266 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1268 this.attr_('highlightCircleSize', this.selPoints_
[i
].name
);
1270 ctx
.fillStyle
= this.plotter_
.colors
[this.selPoints_
[i
].name
];
1271 ctx
.arc(canvasx
, this.selPoints_
[i
].canvasy
, circleSize
,
1272 0, 2 * Math
.PI
, false);
1277 this.previousVerticalX_
= canvasx
;
1282 * Set manually set selected dots, and display information about them
1283 * @param int row number that should by highlighted
1284 * false value clears the selection
1287 Dygraph
.prototype.setSelection
= function(row
) {
1288 // Extract the points we've selected
1289 this.selPoints_
= [];
1292 if (row
!== false) {
1293 row
= row
-this.boundaryIds_
[0][0];
1296 if (row
!== false && row
>= 0) {
1297 for (var i
in this.layout_
.datasets
) {
1298 if (row
< this.layout_
.datasets
[i
].length
) {
1299 var point
= this.layout_
.points
[pos
+row
];
1301 if (this.attr_("stackedGraph")) {
1302 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1305 this.selPoints_
.push(point
);
1307 pos
+= this.layout_
.datasets
[i
].length
;
1311 if (this.selPoints_
.length
) {
1312 this.lastx_
= this.selPoints_
[0].xval
;
1313 this.updateSelection_();
1316 this.clearSelection();
1322 * The mouse has left the canvas. Clear out whatever artifacts remain
1323 * @param {Object} event the mouseout event from the browser.
1326 Dygraph
.prototype.mouseOut_
= function(event
) {
1327 if (this.attr_("unhighlightCallback")) {
1328 this.attr_("unhighlightCallback")(event
);
1331 if (this.attr_("hideOverlayOnMouseOut")) {
1332 this.clearSelection();
1337 * Remove all selection from the canvas
1340 Dygraph
.prototype.clearSelection
= function() {
1341 // Get rid of the overlay data
1342 var ctx
= this.canvas_
.getContext("2d");
1343 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1344 this.attr_("labelsDiv").innerHTML
= "";
1345 this.selPoints_
= [];
1350 * Returns the number of the currently selected row
1351 * @return int row number, of -1 if nothing is selected
1354 Dygraph
.prototype.getSelection
= function() {
1355 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1359 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1360 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1361 return row
+ this.boundaryIds_
[0][0];
1367 Dygraph
.zeropad
= function(x
) {
1368 if (x
< 10) return "0" + x
; else return "" + x
;
1372 * Return a string version of the hours, minutes and seconds portion of a date.
1373 * @param {Number} date The JavaScript date (ms since epoch)
1374 * @return {String} A time of the form "HH:MM:SS"
1377 Dygraph
.hmsString_
= function(date
) {
1378 var zeropad
= Dygraph
.zeropad
;
1379 var d
= new Date(date
);
1380 if (d
.getSeconds()) {
1381 return zeropad(d
.getHours()) + ":" +
1382 zeropad(d
.getMinutes()) + ":" +
1383 zeropad(d
.getSeconds());
1385 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
1390 * Convert a JS date to a string appropriate to display on an axis that
1391 * is displaying values at the stated granularity.
1392 * @param {Date} date The date to format
1393 * @param {Number} granularity One of the Dygraph granularity constants
1394 * @return {String} The formatted date
1397 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1398 if (granularity
>= Dygraph
.MONTHLY
) {
1399 return date
.strftime('%b %y');
1401 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1402 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1403 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1405 return Dygraph
.hmsString_(date
.getTime());
1411 * Convert a JS date (millis since epoch) to YYYY/MM/DD
1412 * @param {Number} date The JavaScript date (ms since epoch)
1413 * @return {String} A date of the form "YYYY/MM/DD"
1416 Dygraph
.dateString_
= function(date
, self
) {
1417 var zeropad
= Dygraph
.zeropad
;
1418 var d
= new Date(date
);
1421 var year
= "" + d
.getFullYear();
1422 // Get a 0 padded month string
1423 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
1424 // Get a 0 padded day string
1425 var day
= zeropad(d
.getDate());
1428 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1429 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
1431 return year
+ "/" + month + "/" + day
+ ret
;
1435 * Round a number to the specified number of digits past the decimal point.
1436 * @param {Number} num The number to round
1437 * @param {Number} places The number of decimals to which to round
1438 * @return {Number} The rounded number
1441 Dygraph
.round_
= function(num
, places
) {
1442 var shift
= Math
.pow(10, places
);
1443 return Math
.round(num
* shift
)/shift
;
1447 * Fires when there's data available to be graphed.
1448 * @param {String} data Raw CSV data to be plotted
1451 Dygraph
.prototype.loadedEvent_
= function(data
) {
1452 this.rawData_
= this.parseCSV_(data
);
1456 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1457 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1458 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1461 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1464 Dygraph
.prototype.addXTicks_
= function() {
1465 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1466 var startDate
, endDate
;
1467 if (this.dateWindow_
) {
1468 startDate
= this.dateWindow_
[0];
1469 endDate
= this.dateWindow_
[1];
1471 startDate
= this.rawData_
[0][0];
1472 endDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1475 var xTicks
= this.attr_('xTicker')(startDate
, endDate
, this);
1476 this.layout_
.updateOptions({xTicks
: xTicks
});
1479 // Time granularity enumeration
1480 Dygraph
.SECONDLY
= 0;
1481 Dygraph
.TWO_SECONDLY
= 1;
1482 Dygraph
.FIVE_SECONDLY
= 2;
1483 Dygraph
.TEN_SECONDLY
= 3;
1484 Dygraph
.THIRTY_SECONDLY
= 4;
1485 Dygraph
.MINUTELY
= 5;
1486 Dygraph
.TWO_MINUTELY
= 6;
1487 Dygraph
.FIVE_MINUTELY
= 7;
1488 Dygraph
.TEN_MINUTELY
= 8;
1489 Dygraph
.THIRTY_MINUTELY
= 9;
1490 Dygraph
.HOURLY
= 10;
1491 Dygraph
.TWO_HOURLY
= 11;
1492 Dygraph
.SIX_HOURLY
= 12;
1494 Dygraph
.WEEKLY
= 14;
1495 Dygraph
.MONTHLY
= 15;
1496 Dygraph
.QUARTERLY
= 16;
1497 Dygraph
.BIANNUAL
= 17;
1498 Dygraph
.ANNUAL
= 18;
1499 Dygraph
.DECADAL
= 19;
1500 Dygraph
.NUM_GRANULARITIES
= 20;
1502 Dygraph
.SHORT_SPACINGS
= [];
1503 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1504 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1505 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1506 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1507 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1508 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1509 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1510 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1511 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1512 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1513 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1514 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1515 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1516 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1517 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1521 // If we used this time granularity, how many ticks would there be?
1522 // This is only an approximation, but it's generally good enough.
1524 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1525 if (granularity
< Dygraph
.MONTHLY
) {
1526 // Generate one tick mark for every fixed interval of time.
1527 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1528 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1530 var year_mod
= 1; // e.g. to only print one point every 10 years.
1531 var num_months
= 12;
1532 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1533 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1534 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1535 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1537 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1538 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1539 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1545 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1546 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1548 // Returns an array containing {v: millis, label: label} dictionaries.
1550 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1551 var formatter
= this.attr_("xAxisLabelFormatter");
1553 if (granularity
< Dygraph
.MONTHLY
) {
1554 // Generate one tick mark for every fixed interval of time.
1555 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1556 var format
= '%d%b'; // e.g. "1Jan"
1558 // Find a time less than start_time which occurs on a "nice" time boundary
1559 // for this granularity.
1560 var g
= spacing
/ 1000;
1561 var d
= new Date(start_time
);
1562 if (g
<= 60) { // seconds
1563 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1567 if (g
<= 60) { // minutes
1568 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1573 if (g
<= 24) { // days
1574 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1579 if (g
== 7) { // one week
1580 d
.setDate(d
.getDate() - d
.getDay());
1585 start_time
= d
.getTime();
1587 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1588 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1591 // Display a tick mark on the first of a set of months of each year.
1592 // Years get a tick mark iff y % year_mod == 0. This is useful for
1593 // displaying a tick mark once every 10 years, say, on long time scales.
1595 var year_mod
= 1; // e.g. to only print one point every 10 years.
1597 if (granularity
== Dygraph
.MONTHLY
) {
1598 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1599 } else if (granularity
== Dygraph
.QUARTERLY
) {
1600 months
= [ 0, 3, 6, 9 ];
1601 } else if (granularity
== Dygraph
.BIANNUAL
) {
1603 } else if (granularity
== Dygraph
.ANNUAL
) {
1605 } else if (granularity
== Dygraph
.DECADAL
) {
1610 var start_year
= new Date(start_time
).getFullYear();
1611 var end_year
= new Date(end_time
).getFullYear();
1612 var zeropad
= Dygraph
.zeropad
;
1613 for (var i
= start_year
; i
<= end_year
; i
++) {
1614 if (i
% year_mod
!= 0) continue;
1615 for (var j
= 0; j
< months
.length
; j
++) {
1616 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1617 var t
= Date
.parse(date_str
);
1618 if (t
< start_time
|| t
> end_time
) continue;
1619 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1629 * Add ticks to the x-axis based on a date range.
1630 * @param {Number} startDate Start of the date window (millis since epoch)
1631 * @param {Number} endDate End of the date window (millis since epoch)
1632 * @return {Array.<Object>} Array of {label, value} tuples.
1635 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1637 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1638 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1639 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1646 return self
.GetXAxis(startDate
, endDate
, chosen
);
1648 // TODO(danvk): signal error.
1653 * Add ticks when the x axis has numbers on it (instead of dates)
1654 * @param {Number} startDate Start of the date window (millis since epoch)
1655 * @param {Number} endDate End of the date window (millis since epoch)
1657 * @param {function} attribute accessor function.
1658 * @return {Array.<Object>} Array of {label, value} tuples.
1661 Dygraph
.numericTicks
= function(minV
, maxV
, self
, axis_props
, vals
) {
1662 var attr
= function(k
) {
1663 if (axis_props
&& axis_props
.hasOwnProperty(k
)) return axis_props
[k
];
1664 return self
.attr_(k
);
1669 for (var i
= 0; i
< vals
.length
; i
++) {
1670 ticks
.push({v
: vals
[i
]});
1674 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1675 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1676 // The first spacing greater than pixelsPerYLabel is what we use.
1677 // TODO(danvk): version that works on a log scale.
1678 if (attr("labelsKMG2")) {
1679 var mults
= [1, 2, 4, 8];
1681 var mults
= [1, 2, 5];
1683 var scale
, low_val
, high_val
, nTicks
;
1684 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1685 var pixelsPerTick
= attr('pixelsPerYLabel');
1686 for (var i
= -10; i
< 50; i
++) {
1687 if (attr("labelsKMG2")) {
1688 var base_scale
= Math
.pow(16, i
);
1690 var base_scale
= Math
.pow(10, i
);
1692 for (var j
= 0; j
< mults
.length
; j
++) {
1693 scale
= base_scale
* mults
[j
];
1694 low_val
= Math
.floor(minV
/ scale
) * scale
;
1695 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1696 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
1697 var spacing
= self
.height_
/ nTicks
;
1698 // wish I could break out of both loops at once...
1699 if (spacing
> pixelsPerTick
) break;
1701 if (spacing
> pixelsPerTick
) break;
1704 // Construct the set of ticks.
1705 // Allow reverse y-axis if it's explicitly requested.
1706 if (low_val
> high_val
) scale
*= -1;
1707 for (var i
= 0; i
< nTicks
; i
++) {
1708 var tickV
= low_val
+ i
* scale
;
1709 ticks
.push( {v
: tickV
} );
1713 // Add formatted labels to the ticks.
1716 if (attr("labelsKMB")) {
1718 k_labels
= [ "K", "M", "B", "T" ];
1720 if (attr("labelsKMG2")) {
1721 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1723 k_labels
= [ "k", "M", "G", "T" ];
1725 var formatter
= attr('yAxisLabelFormatter') ? attr('yAxisLabelFormatter') : attr('yValueFormatter');
1727 for (var i
= 0; i
< ticks
.length
; i
++) {
1728 var tickV
= ticks
[i
].v
;
1729 var absTickV
= Math
.abs(tickV
);
1731 if (formatter
!= undefined
) {
1732 label
= formatter(tickV
);
1734 label
= Dygraph
.round_(tickV
, 2);
1736 if (k_labels
.length
) {
1737 // Round up to an appropriate unit.
1739 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
1740 if (absTickV
>= n
) {
1741 label
= Dygraph
.round_(tickV
/ n
, 1) + k_labels
[j
];
1746 ticks
[i
].label
= label
;
1751 // Computes the range of the data series (including confidence intervals).
1752 // series is either [ [x1, y1], [x2, y2], ... ] or
1753 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1754 // Returns [low, high]
1755 Dygraph
.prototype.extremeValues_
= function(series
) {
1756 var minY
= null, maxY
= null;
1758 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1760 // With custom bars, maxY is the max of the high values.
1761 for (var j
= 0; j
< series
.length
; j
++) {
1762 var y
= series
[j
][1][0];
1764 var low
= y
- series
[j
][1][1];
1765 var high
= y
+ series
[j
][1][2];
1766 if (low
> y
) low
= y
; // this can happen with custom bars,
1767 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1768 if (maxY
== null || high
> maxY
) {
1771 if (minY
== null || low
< minY
) {
1776 for (var j
= 0; j
< series
.length
; j
++) {
1777 var y
= series
[j
][1];
1778 if (y
=== null || isNaN(y
)) continue;
1779 if (maxY
== null || y
> maxY
) {
1782 if (minY
== null || y
< minY
) {
1788 return [minY
, maxY
];
1792 * This function is called once when the chart's data is changed or the options
1793 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1794 * idea is that values derived from the chart's data can be computed here,
1795 * rather than every time the chart is drawn. This includes things like the
1796 * number of axes, rolling averages, etc.
1798 Dygraph
.prototype.predraw_
= function() {
1799 // TODO(danvk): move more computations out of drawGraph_ and into here.
1800 this.computeYAxes_();
1802 // Create a new plotter.
1803 if (this.plotter_
) this.plotter_
.clear();
1804 this.plotter_
= new DygraphCanvasRenderer(this,
1805 this.hidden_
, this.layout_
,
1806 this.renderOptions_
);
1808 // The roller sits in the bottom left corner of the chart. We don't know where
1809 // this will be until the options are available, so it's positioned here.
1810 this.createRollInterface_();
1812 // Same thing applies for the labelsDiv. It's right edge should be flush with
1813 // the right edge of the charting area (which may not be the same as the right
1814 // edge of the div, if we have two y-axes.
1815 this.positionLabelsDiv_();
1817 // If the data or options have changed, then we'd better redraw.
1823 * Update the graph with new data. This method is called when the viewing area
1824 * has changed. If the underlying data or options have changed, predraw_ will
1825 * be called before drawGraph_ is called.
1828 Dygraph
.prototype.drawGraph_
= function() {
1829 var data
= this.rawData_
;
1831 // This is used to set the second parameter to drawCallback, below.
1832 var is_initial_draw
= this.is_initial_draw_
;
1833 this.is_initial_draw_
= false;
1835 var minY
= null, maxY
= null;
1836 this.layout_
.removeAllDatasets();
1838 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
1840 // Loop over the fields (series). Go from the last to the first,
1841 // because if they're stacked that's how we accumulate the values.
1843 var cumulative_y
= []; // For stacked series.
1846 var extremes
= {}; // series name -> [low, high]
1848 // Loop over all fields and create datasets
1849 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
1850 if (!this.visibility()[i
- 1]) continue;
1852 var seriesName
= this.attr_("labels")[i
];
1853 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
1856 for (var j
= 0; j
< data
.length
; j
++) {
1857 if (data
[j
][i
] != null || !connectSeparatedPoints
) {
1858 var date
= data
[j
][0];
1859 series
.push([date
, data
[j
][i
]]);
1863 // TODO(danvk): move this into predraw_. It's insane to do it here.
1864 series
= this.rollingAverage(series
, this.rollPeriod_
);
1866 // Prune down to the desired range, if necessary (for zooming)
1867 // Because there can be lines going to points outside of the visible area,
1868 // we actually prune to visible points, plus one on either side.
1869 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1870 if (this.dateWindow_
) {
1871 var low
= this.dateWindow_
[0];
1872 var high
= this.dateWindow_
[1];
1874 // TODO(danvk): do binary search instead of linear search.
1875 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1876 var firstIdx
= null, lastIdx
= null;
1877 for (var k
= 0; k
< series
.length
; k
++) {
1878 if (series
[k
][0] >= low
&& firstIdx
=== null) {
1881 if (series
[k
][0] <= high
) {
1885 if (firstIdx
=== null) firstIdx
= 0;
1886 if (firstIdx
> 0) firstIdx
--;
1887 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
1888 if (lastIdx
< series
.length
- 1) lastIdx
++;
1889 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
1890 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
1891 pruned
.push(series
[k
]);
1895 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
1898 var seriesExtremes
= this.extremeValues_(series
);
1901 for (var j
=0; j
<series
.length
; j
++) {
1902 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
1905 } else if (this.attr_("stackedGraph")) {
1906 var l
= series
.length
;
1908 for (var j
= 0; j
< l
; j
++) {
1909 // If one data set has a NaN, let all subsequent stacked
1910 // sets inherit the NaN -- only start at 0 for the first set.
1911 var x
= series
[j
][0];
1912 if (cumulative_y
[x
] === undefined
) {
1913 cumulative_y
[x
] = 0;
1916 actual_y
= series
[j
][1];
1917 cumulative_y
[x
] += actual_y
;
1919 series
[j
] = [x
, cumulative_y
[x
]]
1921 if (cumulative_y
[x
] > seriesExtremes
[1]) {
1922 seriesExtremes
[1] = cumulative_y
[x
];
1924 if (cumulative_y
[x
] < seriesExtremes
[0]) {
1925 seriesExtremes
[0] = cumulative_y
[x
];
1929 extremes
[seriesName
] = seriesExtremes
;
1931 datasets
[i
] = series
;
1934 for (var i
= 1; i
< datasets
.length
; i
++) {
1935 if (!this.visibility()[i
- 1]) continue;
1936 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
1939 // TODO(danvk): this method doesn't need to return anything.
1940 var out
= this.computeYAxisRanges_(extremes
);
1942 var seriesToAxisMap
= out
[1];
1943 this.layout_
.updateOptions( { yAxes
: axes
,
1944 seriesToAxisMap
: seriesToAxisMap
1949 // Tell PlotKit to use this new data and render itself
1950 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
1951 this.layout_
.evaluateWithError();
1952 this.plotter_
.clear();
1953 this.plotter_
.render();
1954 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
1955 this.canvas_
.height
);
1957 if (this.attr_("drawCallback") !== null) {
1958 this.attr_("drawCallback")(this, is_initial_draw
);
1963 * Determine properties of the y-axes which are independent of the data
1964 * currently being displayed. This includes things like the number of axes and
1965 * the style of the axes. It does not include the range of each axis and its
1967 * This fills in this.axes_ and this.seriesToAxisMap_.
1968 * axes_ = [ { options } ]
1969 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
1970 * indices are into the axes_ array.
1972 Dygraph
.prototype.computeYAxes_
= function() {
1973 this.axes_
= [{}]; // always have at least one y-axis.
1974 this.seriesToAxisMap_
= {};
1976 // Get a list of series names.
1977 var labels
= this.attr_("labels");
1979 for (var i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
1981 // all options which could be applied per-axis:
1989 'axisLabelFontSize',
1993 // Copy global axis options over to the first axis.
1994 for (var i
= 0; i
< axisOptions
.length
; i
++) {
1995 var k
= axisOptions
[i
];
1996 var v
= this.attr_(k
);
1997 if (v
) this.axes_
[0][k
] = v
;
2000 // Go through once and add all the axes.
2001 for (var seriesName
in series
) {
2002 if (!series
.hasOwnProperty(seriesName
)) continue;
2003 var axis
= this.attr_("axis", seriesName
);
2005 this.seriesToAxisMap_
[seriesName
] = 0;
2008 if (typeof(axis
) == 'object') {
2009 // Add a new axis, making a copy of its per-axis options.
2011 Dygraph
.update(opts
, this.axes_
[0]);
2012 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2013 Dygraph
.update(opts
, axis
);
2014 this.axes_
.push(opts
);
2015 this.seriesToAxisMap_
[seriesName
] = this.axes_
.length
- 1;
2019 // Go through one more time and assign series to an axis defined by another
2020 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2021 for (var seriesName
in series
) {
2022 if (!series
.hasOwnProperty(seriesName
)) continue;
2023 var axis
= this.attr_("axis", seriesName
);
2024 if (typeof(axis
) == 'string') {
2025 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2026 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2027 "series " + axis
+ ", which does not define its own axis.");
2030 var idx
= this.seriesToAxisMap_
[axis
];
2031 this.seriesToAxisMap_
[seriesName
] = idx
;
2035 // Now we remove series from seriesToAxisMap_ which are not visible. We do
2036 // this last so that hiding the first series doesn't destroy the axis
2037 // properties of the primary axis.
2038 var seriesToAxisFiltered
= {};
2039 var vis
= this.visibility();
2040 for (var i
= 1; i
< labels
.length
; i
++) {
2042 if (vis
[i
- 1]) seriesToAxisFiltered
[s
] = this.seriesToAxisMap_
[s
];
2044 this.seriesToAxisMap_
= seriesToAxisFiltered
;
2048 * Returns the number of y-axes on the chart.
2049 * @return {Number} the number of axes.
2051 Dygraph
.prototype.numAxes
= function() {
2053 for (var series
in this.seriesToAxisMap_
) {
2054 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2055 var idx
= this.seriesToAxisMap_
[series
];
2056 if (idx
> last_axis
) last_axis
= idx
;
2058 return 1 + last_axis
;
2062 * Determine the value range and tick marks for each axis.
2063 * @param {Object} extremes A mapping from seriesName -> [low, high]
2064 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2066 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2067 // Build a map from axis number -> [list of series names]
2068 var seriesForAxis
= [];
2069 for (var series
in this.seriesToAxisMap_
) {
2070 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2071 var idx
= this.seriesToAxisMap_
[series
];
2072 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2073 seriesForAxis
[idx
].push(series
);
2076 // Compute extreme values, a span and tick marks for each axis.
2077 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2078 var axis
= this.axes_
[i
];
2079 if (axis
.valueWindow
) {
2080 // This is only set if the user has zoomed on the y-axis. It is never set
2081 // by a user. It takes precedence over axis.valueRange because, if you set
2082 // valueRange, you'd still expect to be able to pan.
2083 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2084 } else if (axis
.valueRange
) {
2085 // This is a user-set value range for this axis.
2086 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2088 // Calculate the extremes of extremes.
2089 var series
= seriesForAxis
[i
];
2090 var minY
= Infinity
; // extremes[series[0]][0];
2091 var maxY
= -Infinity
; // extremes[series[0]][1];
2092 for (var j
= 0; j
< series
.length
; j
++) {
2093 minY
= Math
.min(extremes
[series
[j
]][0], minY
);
2094 maxY
= Math
.max(extremes
[series
[j
]][1], maxY
);
2096 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2098 // Add some padding and round up to an integer to be human-friendly.
2099 var span
= maxY
- minY
;
2100 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2101 if (span
== 0) { span
= maxY
; }
2102 var maxAxisY
= maxY
+ 0.1 * span
;
2103 var minAxisY
= minY
- 0.1 * span
;
2105 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2106 if (!this.attr_("avoidMinZero")) {
2107 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2108 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2111 if (this.attr_("includeZero")) {
2112 if (maxY
< 0) maxAxisY
= 0;
2113 if (minY
> 0) minAxisY
= 0;
2116 axis
.computedValueRange
= [minAxisY
, maxAxisY
];
2119 // Add ticks. By default, all axes inherit the tick positions of the
2120 // primary axis. However, if an axis is specifically marked as having
2121 // independent ticks, then that is permissible as well.
2122 if (i
== 0 || axis
.independentTicks
) {
2124 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2125 axis
.computedValueRange
[1],
2129 var p_axis
= this.axes_
[0];
2130 var p_ticks
= p_axis
.ticks
;
2131 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2132 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2133 var tick_values
= [];
2134 for (var i
= 0; i
< p_ticks
.length
; i
++) {
2135 var y_frac
= (p_ticks
[i
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2136 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2137 tick_values
.push(y_val
);
2141 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2142 axis
.computedValueRange
[1],
2143 this, axis
, tick_values
);
2147 return [this.axes_
, this.seriesToAxisMap_
];
2151 * Calculates the rolling average of a data set.
2152 * If originalData is [label, val], rolls the average of those.
2153 * If originalData is [label, [, it's interpreted as [value, stddev]
2154 * and the roll is returned in the same form, with appropriately reduced
2155 * stddev for each value.
2156 * Note that this is where fractional input (i.e. '5/10') is converted into
2158 * @param {Array} originalData The data in the appropriate format (see above)
2159 * @param {Number} rollPeriod The number of days over which to average the data
2161 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2162 if (originalData
.length
< 2)
2163 return originalData
;
2164 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
2165 var rollingData
= [];
2166 var sigma
= this.attr_("sigma");
2168 if (this.fractions_
) {
2170 var den
= 0; // numerator/denominator
2172 for (var i
= 0; i
< originalData
.length
; i
++) {
2173 num
+= originalData
[i
][1][0];
2174 den
+= originalData
[i
][1][1];
2175 if (i
- rollPeriod
>= 0) {
2176 num
-= originalData
[i
- rollPeriod
][1][0];
2177 den
-= originalData
[i
- rollPeriod
][1][1];
2180 var date
= originalData
[i
][0];
2181 var value
= den
? num
/ den
: 0.0;
2182 if (this.attr_("errorBars")) {
2183 if (this.wilsonInterval_
) {
2184 // For more details on this confidence interval, see:
2185 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2187 var p
= value
< 0 ? 0 : value
, n
= den
;
2188 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2189 var denom
= 1 + sigma
* sigma
/ den
;
2190 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2191 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2192 rollingData
[i
] = [date
,
2193 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2195 rollingData
[i
] = [date
, [0, 0, 0]];
2198 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2199 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2202 rollingData
[i
] = [date
, mult
* value
];
2205 } else if (this.attr_("customBars")) {
2210 for (var i
= 0; i
< originalData
.length
; i
++) {
2211 var data
= originalData
[i
][1];
2213 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2215 if (y
!= null && !isNaN(y
)) {
2221 if (i
- rollPeriod
>= 0) {
2222 var prev
= originalData
[i
- rollPeriod
];
2223 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
2230 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2231 1.0 * (mid
- low
) / count
,
2232 1.0 * (high
- mid
) / count
]];
2235 // Calculate the rolling average for the first rollPeriod - 1 points where
2236 // there is not enough data to roll over the full number of days
2237 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
2238 if (!this.attr_("errorBars")){
2239 if (rollPeriod
== 1) {
2240 return originalData
;
2243 for (var i
= 0; i
< originalData
.length
; i
++) {
2246 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2247 var y
= originalData
[j
][1];
2248 if (y
== null || isNaN(y
)) continue;
2250 sum
+= originalData
[j
][1];
2253 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2255 rollingData
[i
] = [originalData
[i
][0], null];
2260 for (var i
= 0; i
< originalData
.length
; i
++) {
2264 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2265 var y
= originalData
[j
][1][0];
2266 if (y
== null || isNaN(y
)) continue;
2268 sum
+= originalData
[j
][1][0];
2269 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2272 var stddev
= Math
.sqrt(variance
) / num_ok
;
2273 rollingData
[i
] = [originalData
[i
][0],
2274 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2276 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2286 * Parses a date, returning the number of milliseconds since epoch. This can be
2287 * passed in as an xValueParser in the Dygraph constructor.
2288 * TODO(danvk): enumerate formats that this understands.
2289 * @param {String} A date in YYYYMMDD format.
2290 * @return {Number} Milliseconds since epoch.
2293 Dygraph
.dateParser
= function(dateStr
, self
) {
2296 if (dateStr
.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12'
2297 dateStrSlashed
= dateStr
.replace("-", "/", "g");
2298 while (dateStrSlashed
.search("-") != -1) {
2299 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
2301 d
= Date
.parse(dateStrSlashed
);
2302 } else if (dateStr
.length
== 8) { // e.g. '20090712'
2303 // TODO(danvk): remove support for this format. It's confusing.
2304 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
2305 + "/" + dateStr
.substr(6,2);
2306 d
= Date
.parse(dateStrSlashed
);
2308 // Any format that Date.parse will accept, e.g. "2009/07/12" or
2309 // "2009/07/12 12:34:56"
2310 d
= Date
.parse(dateStr
);
2313 if (!d
|| isNaN(d
)) {
2314 self
.error("Couldn't parse " + dateStr
+ " as a date");
2320 * Detects the type of the str (date or numeric) and sets the various
2321 * formatting attributes in this.attrs_ based on this type.
2322 * @param {String} str An x value.
2325 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2327 if (str
.indexOf('-') >= 0 ||
2328 str
.indexOf('/') >= 0 ||
2329 isNaN(parseFloat(str
))) {
2331 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2332 // TODO(danvk): remove support for this format.
2337 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2338 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2339 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2340 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2342 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2343 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2344 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2345 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2350 * Parses a string in a special csv format. We expect a csv file where each
2351 * line is a date point, and the first field in each line is the date string.
2352 * We also expect that all remaining fields represent series.
2353 * if the errorBars attribute is set, then interpret the fields as:
2354 * date, series1, stddev1, series2, stddev2, ...
2355 * @param {Array.<Object>} data See above.
2358 * @return Array.<Object> An array with one entry for each row. These entries
2359 * are an array of cells in that row. The first entry is the parsed x-value for
2360 * the row. The second, third, etc. are the y-values. These can take on one of
2361 * three forms, depending on the CSV and constructor parameters:
2363 * 2. [ value, stddev ]
2364 * 3. [ low value, center value, high value ]
2366 Dygraph
.prototype.parseCSV_
= function(data
) {
2368 var lines
= data
.split("\n");
2370 // Use the default delimiter or fall back to a tab if that makes sense.
2371 var delim
= this.attr_('delimiter');
2372 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2377 if (this.labelsFromCSV_
) {
2379 this.attrs_
.labels
= lines
[0].split(delim
);
2382 // Parse the x as a float or return null if it's not a number.
2383 var parseFloatOrNull
= function(x
) {
2384 var val
= parseFloat(x
);
2385 return isNaN(val
) ? null : val
;
2389 var defaultParserSet
= false; // attempt to auto-detect x value type
2390 var expectedCols
= this.attr_("labels").length
;
2391 var outOfOrder
= false;
2392 for (var i
= start
; i
< lines
.length
; i
++) {
2393 var line
= lines
[i
];
2394 if (line
.length
== 0) continue; // skip blank lines
2395 if (line
[0] == '#') continue; // skip comment lines
2396 var inFields
= line
.split(delim
);
2397 if (inFields
.length
< 2) continue;
2400 if (!defaultParserSet
) {
2401 this.detectTypeFromString_(inFields
[0]);
2402 xParser
= this.attr_("xValueParser");
2403 defaultParserSet
= true;
2405 fields
[0] = xParser(inFields
[0], this);
2407 // If fractions are expected, parse the numbers as "A/B
"
2408 if (this.fractions_) {
2409 for (var j = 1; j < inFields.length; j++) {
2410 // TODO(danvk): figure out an appropriate way to flag parse errors.
2411 var vals = inFields[j].split("/");
2412 fields[j] = [parseFloatOrNull(vals[0]), parseFloatOrNull(vals[1])];
2414 } else if (this.attr_("errorBars
")) {
2415 // If there are error bars, values are (value, stddev) pairs
2416 for (var j = 1; j < inFields.length; j += 2)
2417 fields[(j + 1) / 2] = [parseFloatOrNull(inFields[j]),
2418 parseFloatOrNull(inFields[j + 1])];
2419 } else if (this.attr_("customBars
")) {
2420 // Bars are a low;center;high tuple
2421 for (var j = 1; j < inFields.length; j++) {
2422 var vals = inFields[j].split(";");
2423 fields[j] = [ parseFloatOrNull(vals[0]),
2424 parseFloatOrNull(vals[1]),
2425 parseFloatOrNull(vals[2]) ];
2428 // Values are just numbers
2429 for (var j = 1; j < inFields.length; j++) {
2430 fields[j] = parseFloatOrNull(inFields[j]);
2433 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2438 if (fields.length != expectedCols) {
2439 this.error("Number of columns
in line
" + i + " (" + fields.length +
2440 ") does not agree
with number of
labels (" + expectedCols +
2446 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2447 ret.sort(function(a,b) { return a[0] - b[0] });
2454 * The user has provided their data as a pre-packaged JS array. If the x values
2455 * are numeric, this is the same as dygraphs' internal format. If the x values
2456 * are dates, we need to convert them from Date objects to ms since epoch.
2457 * @param {Array.<Object>} data
2458 * @return {Array.<Object>} data with numeric x values.
2460 Dygraph.prototype.parseArray_ = function(data) {
2461 // Peek at the first x value to see if it's numeric.
2462 if (data.length == 0) {
2463 this.error("Can
't plot empty data set");
2466 if (data[0].length == 0) {
2467 this.error("Data set cannot contain an empty row");
2471 if (this.attr_("labels") == null) {
2472 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2473 "in the options parameter");
2474 this.attrs_.labels = [ "X" ];
2475 for (var i = 1; i < data[0].length; i++) {
2476 this.attrs_.labels.push("Y" + i);
2480 if (Dygraph.isDateLike(data[0][0])) {
2481 // Some intelligent defaults for a date x-axis.
2482 this.attrs_.xValueFormatter = Dygraph.dateString_;
2483 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
2484 this.attrs_.xTicker = Dygraph.dateTicker;
2486 // Assume they're all dates
.
2487 var parsedData
= Dygraph
.clone(data
);
2488 for (var i
= 0; i
< data
.length
; i
++) {
2489 if (parsedData
[i
].length
== 0) {
2490 this.error("Row " + (1 + i
) + " of data is empty");
2493 if (parsedData
[i
][0] == null
2494 || typeof(parsedData
[i
][0].getTime
) != 'function'
2495 || isNaN(parsedData
[i
][0].getTime())) {
2496 this.error("x value in row " + (1 + i
) + " is not a Date");
2499 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2503 // Some intelligent defaults for a numeric x-axis.
2504 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2505 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2511 * Parses a DataTable object from gviz.
2512 * The data is expected to have a first column that is either a date or a
2513 * number. All subsequent columns must be numbers. If there is a clear mismatch
2514 * between this.xValueParser_ and the type of the first column, it will be
2515 * fixed. Fills out rawData_.
2516 * @param {Array.<Object>} data See above.
2519 Dygraph
.prototype.parseDataTable_
= function(data
) {
2520 var cols
= data
.getNumberOfColumns();
2521 var rows
= data
.getNumberOfRows();
2523 var indepType
= data
.getColumnType(0);
2524 if (indepType
== 'date' || indepType
== 'datetime') {
2525 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2526 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2527 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2528 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2529 } else if (indepType
== 'number') {
2530 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2531 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2532 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2533 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2535 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2536 "column 1 of DataTable input (Got '" + indepType
+ "')");
2540 // Array of the column indices which contain data (and not annotations).
2542 var annotationCols
= {}; // data index -> [annotation cols]
2543 var hasAnnotations
= false;
2544 for (var i
= 1; i
< cols
; i
++) {
2545 var type
= data
.getColumnType(i
);
2546 if (type
== 'number') {
2548 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2549 // This is OK -- it's an annotation column.
2550 var dataIdx
= colIdx
[colIdx
.length
- 1];
2551 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2552 annotationCols
[dataIdx
] = [i
];
2554 annotationCols
[dataIdx
].push(i
);
2556 hasAnnotations
= true;
2558 this.error("Only 'number' is supported as a dependent type with Gviz." +
2559 " 'string' is only supported if displayAnnotations is true");
2563 // Read column labels
2564 // TODO(danvk): add support back for errorBars
2565 var labels
= [data
.getColumnLabel(0)];
2566 for (var i
= 0; i
< colIdx
.length
; i
++) {
2567 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2568 if (this.attr_("errorBars")) i
+= 1;
2570 this.attrs_
.labels
= labels
;
2571 cols
= labels
.length
;
2574 var outOfOrder
= false;
2575 var annotations
= [];
2576 for (var i
= 0; i
< rows
; i
++) {
2578 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2579 data
.getValue(i
, 0) === null) {
2580 this.warn("Ignoring row " + i
+
2581 " of DataTable because of undefined or null first column.");
2585 if (indepType
== 'date' || indepType
== 'datetime') {
2586 row
.push(data
.getValue(i
, 0).getTime());
2588 row
.push(data
.getValue(i
, 0));
2590 if (!this.attr_("errorBars")) {
2591 for (var j
= 0; j
< colIdx
.length
; j
++) {
2592 var col
= colIdx
[j
];
2593 row
.push(data
.getValue(i
, col
));
2594 if (hasAnnotations
&&
2595 annotationCols
.hasOwnProperty(col
) &&
2596 data
.getValue(i
, annotationCols
[col
][0]) != null) {
2598 ann
.series
= data
.getColumnLabel(col
);
2600 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
2602 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2603 if (k
) ann
.text
+= "\n";
2604 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2606 annotations
.push(ann
);
2610 for (var j
= 0; j
< cols
- 1; j
++) {
2611 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2614 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2621 this.warn("DataTable is out of order; order it correctly to speed loading.");
2622 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
2624 this.rawData_
= ret
;
2626 if (annotations
.length
> 0) {
2627 this.setAnnotations(annotations
, true);
2631 // These functions are all based on MochiKit.
2632 Dygraph
.update
= function (self
, o
) {
2633 if (typeof(o
) != 'undefined' && o
!== null) {
2635 if (o
.hasOwnProperty(k
)) {
2643 Dygraph
.isArrayLike
= function (o
) {
2644 var typ
= typeof(o
);
2646 (typ
!= 'object' && !(typ
== 'function' &&
2647 typeof(o
.item
) == 'function')) ||
2649 typeof(o
.length
) != 'number' ||
2657 Dygraph
.isDateLike
= function (o
) {
2658 if (typeof(o
) != "object" || o
=== null ||
2659 typeof(o
.getTime
) != 'function') {
2665 Dygraph
.clone
= function(o
) {
2666 // TODO(danvk): figure out how MochiKit's version works
2668 for (var i
= 0; i
< o
.length
; i
++) {
2669 if (Dygraph
.isArrayLike(o
[i
])) {
2670 r
.push(Dygraph
.clone(o
[i
]));
2680 * Get the CSV data. If it's in a function, call that function. If it's in a
2681 * file, do an XMLHttpRequest to get it.
2684 Dygraph
.prototype.start_
= function() {
2685 if (typeof this.file_
== 'function') {
2686 // CSV string. Pretend we got it via XHR.
2687 this.loadedEvent_(this.file_());
2688 } else if (Dygraph
.isArrayLike(this.file_
)) {
2689 this.rawData_
= this.parseArray_(this.file_
);
2691 } else if (typeof this.file_
== 'object' &&
2692 typeof this.file_
.getColumnRange
== 'function') {
2693 // must be a DataTable from gviz.
2694 this.parseDataTable_(this.file_
);
2696 } else if (typeof this.file_
== 'string') {
2697 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2698 if (this.file_
.indexOf('\n') >= 0) {
2699 this.loadedEvent_(this.file_
);
2701 var req
= new XMLHttpRequest();
2703 req
.onreadystatechange
= function () {
2704 if (req
.readyState
== 4) {
2705 if (req
.status
== 200) {
2706 caller
.loadedEvent_(req
.responseText
);
2711 req
.open("GET", this.file_
, true);
2715 this.error("Unknown data format: " + (typeof this.file_
));
2720 * Changes various properties of the graph. These can include:
2722 * <li>file: changes the source data for the graph</li>
2723 * <li>errorBars: changes whether the data contains stddev</li>
2725 * @param {Object} attrs The new properties and values
2727 Dygraph
.prototype.updateOptions
= function(attrs
) {
2728 // TODO(danvk): this is a mess. Rethink this function.
2729 if ('rollPeriod' in attrs
) {
2730 this.rollPeriod_
= attrs
.rollPeriod
;
2732 if ('dateWindow' in attrs
) {
2733 this.dateWindow_
= attrs
.dateWindow
;
2736 // TODO(danvk): validate per-series options.
2741 // highlightCircleSize
2743 Dygraph
.update(this.user_attrs_
, attrs
);
2744 Dygraph
.update(this.renderOptions_
, attrs
);
2746 this.labelsFromCSV_
= (this.attr_("labels") == null);
2748 // TODO(danvk): this doesn't match the constructor logic
2749 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
2750 if (attrs
['file']) {
2751 this.file_
= attrs
['file'];
2759 * Resizes the dygraph. If no parameters are specified, resizes to fill the
2760 * containing div (which has presumably changed size since the dygraph was
2761 * instantiated. If the width/height are specified, the div will be resized.
2763 * This is far more efficient than destroying and re-instantiating a
2764 * Dygraph, since it doesn't have to reparse the underlying data.
2766 * @param {Number} width Width (in pixels)
2767 * @param {Number} height Height (in pixels)
2769 Dygraph
.prototype.resize
= function(width
, height
) {
2770 if (this.resize_lock
) {
2773 this.resize_lock
= true;
2775 if ((width
=== null) != (height
=== null)) {
2776 this.warn("Dygraph.resize() should be called with zero parameters or " +
2777 "two non-NULL parameters. Pretending it was zero.");
2778 width
= height
= null;
2781 // TODO(danvk): there should be a clear() method.
2782 this.maindiv_
.innerHTML
= "";
2783 this.attrs_
.labelsDiv
= null;
2786 this.maindiv_
.style
.width
= width
+ "px";
2787 this.maindiv_
.style
.height
= height
+ "px";
2788 this.width_
= width
;
2789 this.height_
= height
;
2791 this.width_
= this.maindiv_
.offsetWidth
;
2792 this.height_
= this.maindiv_
.offsetHeight
;
2795 this.createInterface_();
2798 this.resize_lock
= false;
2802 * Adjusts the number of days in the rolling average. Updates the graph to
2803 * reflect the new averaging period.
2804 * @param {Number} length Number of days over which to average the data.
2806 Dygraph
.prototype.adjustRoll
= function(length
) {
2807 this.rollPeriod_
= length
;
2812 * Returns a boolean array of visibility statuses.
2814 Dygraph
.prototype.visibility
= function() {
2815 // Do lazy-initialization, so that this happens after we know the number of
2817 if (!this.attr_("visibility")) {
2818 this.attrs_
["visibility"] = [];
2820 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
2821 this.attr_("visibility").push(true);
2823 return this.attr_("visibility");
2827 * Changes the visiblity of a series.
2829 Dygraph
.prototype.setVisibility
= function(num
, value
) {
2830 var x
= this.visibility();
2831 if (num
< 0 || num
>= x
.length
) {
2832 this.warn("invalid series number in setVisibility: " + num
);
2840 * Update the list of annotations and redraw the chart.
2842 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
2843 // Only add the annotation CSS rule once we know it will be used.
2844 Dygraph
.addAnnotationRule();
2845 this.annotations_
= ann
;
2846 this.layout_
.setAnnotations(this.annotations_
);
2847 if (!suppressDraw
) {
2853 * Return the list of annotations.
2855 Dygraph
.prototype.annotations
= function() {
2856 return this.annotations_
;
2860 * Get the index of a series (column) given its name. The first column is the
2861 * x-axis, so the data series start with index 1.
2863 Dygraph
.prototype.indexFromSetName
= function(name
) {
2864 var labels
= this.attr_("labels");
2865 for (var i
= 0; i
< labels
.length
; i
++) {
2866 if (labels
[i
] == name
) return i
;
2871 Dygraph
.addAnnotationRule
= function() {
2872 if (Dygraph
.addedAnnotationCSS
) return;
2874 var rule
= "border: 1px solid black; " +
2875 "background-color: white; " +
2876 "text-align: center;";
2878 var styleSheetElement
= document
.createElement("style");
2879 styleSheetElement
.type
= "text/css";
2880 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
2882 // Find the first style sheet that we can access.
2883 // We may not add a rule to a style sheet from another domain for security
2884 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
2885 // adds its own style sheets from google.com.
2886 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
2887 if (document
.styleSheets
[i
].disabled
) continue;
2888 var mysheet
= document
.styleSheets
[i
];
2890 if (mysheet
.insertRule
) { // Firefox
2891 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
2892 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
2893 } else if (mysheet
.addRule
) { // IE
2894 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
2896 Dygraph
.addedAnnotationCSS
= true;
2899 // Was likely a security exception.
2903 this.warn("Unable to add default annotation CSS rule; display may be off.");
2907 * Create a new canvas element. This is more complex than a simple
2908 * document.createElement("canvas") because of IE and excanvas.
2910 Dygraph
.createCanvas
= function() {
2911 var canvas
= document
.createElement("canvas");
2913 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
2914 if (isIE
&& (typeof(G_vmlCanvasManager
) != 'undefined')) {
2915 canvas
= G_vmlCanvasManager
.initElement(canvas
);
2923 * A wrapper around Dygraph that implements the gviz API.
2924 * @param {Object} container The DOM object the visualization should live in.
2926 Dygraph
.GVizChart
= function(container
) {
2927 this.container
= container
;
2930 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
2931 // Clear out any existing dygraph.
2932 // TODO(danvk): would it make more sense to simply redraw using the current
2933 // date_graph object?
2934 this.container
.innerHTML
= '';
2935 if (typeof(this.date_graph
) != 'undefined') {
2936 this.date_graph
.destroy();
2939 this.date_graph
= new Dygraph(this.container
, data
, options
);
2943 * Google charts compatible setSelection
2944 * Only row selection is supported, all points in the row will be highlighted
2945 * @param {Array} array of the selected cells
2948 Dygraph
.GVizChart
.prototype.setSelection
= function(selection_array
) {
2950 if (selection_array
.length
) {
2951 row
= selection_array
[0].row
;
2953 this.date_graph
.setSelection(row
);
2957 * Google charts compatible getSelection implementation
2958 * @return {Array} array of the selected cells
2961 Dygraph
.GVizChart
.prototype.getSelection
= function() {
2964 var row
= this.date_graph
.getSelection();
2966 if (row
< 0) return selection
;
2969 for (var i
in this.date_graph
.layout_
.datasets
) {
2970 selection
.push({row
: row
, column
: col
});
2977 // Older pages may still use this name.
2978 DateGraph
= Dygraph
;