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,
95 showLabelsOnHighlight
: true,
97 yValueFormatter
: function(x
) { return Dygraph
.round_(x
, 2); },
102 axisLabelFontSize
: 14,
105 xAxisLabelFormatter
: Dygraph
.dateAxisFormatter
,
109 xValueFormatter
: Dygraph
.dateString_
,
110 xValueParser
: Dygraph
.dateParser
,
111 xTicker
: Dygraph
.dateTicker
,
119 wilsonInterval
: true, // only relevant if fractions is true
123 connectSeparatedPoints
: false,
126 hideOverlayOnMouseOut
: true
129 // Various logging levels.
135 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
136 // Labels is no longer a constructor parameter, since it's typically set
137 // directly from the data source. It also conains a name for the x-axis,
138 // which the previous constructor form did not.
139 if (labels
!= null) {
140 var new_labels
= ["Date"];
141 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
142 Dygraph
.update(attrs
, { 'labels': new_labels
});
144 this.__init__(div
, file
, attrs
);
148 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
149 * and interaction <canvas> inside of it. See the constructor for details
151 * @param {Element} div the Element to render the graph into.
152 * @param {String | Function} file Source data
153 * @param {Object} attrs Miscellaneous other options
156 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
157 // Support two-argument constructor
158 if (attrs
== null) { attrs
= {}; }
160 // Copy the important bits into the object
161 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
164 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
165 this.previousVerticalX_
= -1;
166 this.fractions_
= attrs
.fractions
|| false;
167 this.dateWindow_
= attrs
.dateWindow
|| null;
168 this.valueRange_
= attrs
.valueRange
|| null;
169 this.wilsonInterval_
= attrs
.wilsonInterval
|| true;
170 this.is_initial_draw_
= true;
172 // Clear the div. This ensure that, if multiple dygraphs are passed the same
173 // div, then only one will be drawn.
176 // If the div isn't already sized then inherit from our attrs or
177 // give it a default size.
178 if (div
.style
.width
== '') {
179 div
.style
.width
= attrs
.width
|| Dygraph
.DEFAULT_WIDTH
+ "px";
181 if (div
.style
.height
== '') {
182 div
.style
.height
= attrs
.height
|| Dygraph
.DEFAULT_HEIGHT
+ "px";
184 this.width_
= parseInt(div
.style
.width
, 10);
185 this.height_
= parseInt(div
.style
.height
, 10);
186 // The div might have been specified as percent of the current window size,
187 // convert that to an appropriate number of pixels.
188 if (div
.style
.width
.indexOf("%") == div
.style
.width
.length
- 1) {
189 this.width_
= div
.offsetWidth
;
191 if (div
.style
.height
.indexOf("%") == div
.style
.height
.length
- 1) {
192 this.height_
= div
.offsetHeight
;
195 if (this.width_
== 0) {
196 this.error("dygraph has zero width. Please specify a width in pixels.");
198 if (this.height_
== 0) {
199 this.error("dygraph has zero height. Please specify a height in pixels.");
202 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
203 if (attrs
['stackedGraph']) {
204 attrs
['fillGraph'] = true;
205 // TODO(nikhilk): Add any other stackedGraph checks here.
208 // Dygraphs has many options, some of which interact with one another.
209 // To keep track of everything, we maintain two sets of options:
211 // this.user_attrs_ only options explicitly set by the user.
212 // this.attrs_ defaults, options derived from user_attrs_, data.
214 // Options are then accessed this.attr_('attr'), which first looks at
215 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
216 // defaults without overriding behavior that the user specifically asks for.
217 this.user_attrs_
= {};
218 Dygraph
.update(this.user_attrs_
, attrs
);
221 Dygraph
.update(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
223 this.boundaryIds_
= [];
225 // Make a note of whether labels will be pulled from the CSV file.
226 this.labelsFromCSV_
= (this.attr_("labels") == null);
228 // Create the containing DIV and other interactive elements
229 this.createInterface_();
234 Dygraph
.prototype.attr_
= function(name
) {
235 if (typeof(this.user_attrs_
[name
]) != 'undefined') {
236 return this.user_attrs_
[name
];
237 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
238 return this.attrs_
[name
];
244 // TODO(danvk): any way I can get the line numbers to be this.warn call?
245 Dygraph
.prototype.log
= function(severity
, message
) {
246 if (typeof(console
) != 'undefined') {
249 console
.debug('dygraphs: ' + message
);
252 console
.info('dygraphs: ' + message
);
254 case Dygraph
.WARNING
:
255 console
.warn('dygraphs: ' + message
);
258 console
.error('dygraphs: ' + message
);
263 Dygraph
.prototype.info
= function(message
) {
264 this.log(Dygraph
.INFO
, message
);
266 Dygraph
.prototype.warn
= function(message
) {
267 this.log(Dygraph
.WARNING
, message
);
269 Dygraph
.prototype.error
= function(message
) {
270 this.log(Dygraph
.ERROR
, message
);
274 * Returns the current rolling period, as set by the user or an option.
275 * @return {Number} The number of days in the rolling window
277 Dygraph
.prototype.rollPeriod
= function() {
278 return this.rollPeriod_
;
282 * Returns the currently-visible x-range. This can be affected by zooming,
283 * panning or a call to updateOptions.
284 * Returns a two-element array: [left, right].
285 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
287 Dygraph
.prototype.xAxisRange
= function() {
288 if (this.dateWindow_
) return this.dateWindow_
;
290 // The entire chart is visible.
291 var left
= this.rawData_
[0][0];
292 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
293 return [left
, right
];
297 * Returns the currently-visible y-range. This can be affected by zooming,
298 * panning or a call to updateOptions.
299 * Returns a two-element array: [bottom, top].
301 Dygraph
.prototype.yAxisRange
= function() {
302 return this.displayedYRange_
;
306 * Convert from data coordinates to canvas/div X/Y coordinates.
307 * Returns a two-element array: [X, Y]
309 Dygraph
.prototype.toDomCoords
= function(x
, y
) {
310 var ret
= [null, null];
311 var area
= this.plotter_
.area
;
313 var xRange
= this.xAxisRange();
314 ret
[0] = area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
318 var yRange
= this.yAxisRange();
319 ret
[1] = area
.y
+ (yRange
[1] - y
) / (yRange
[1] - yRange
[0]) * area
.h
;
325 // TODO(danvk): use these functions throughout dygraphs.
327 * Convert from canvas/div coords to data coordinates.
328 * Returns a two-element array: [X, Y]
330 Dygraph
.prototype.toDataCoords
= function(x
, y
) {
331 var ret
= [null, null];
332 var area
= this.plotter_
.area
;
334 var xRange
= this.xAxisRange();
335 ret
[0] = xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
339 var yRange
= this.yAxisRange();
340 ret
[1] = yRange
[0] + (area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
346 Dygraph
.addEvent
= function(el
, evt
, fn
) {
347 var normed_fn
= function(e
) {
348 if (!e
) var e
= window
.event
;
351 if (window
.addEventListener
) { // Mozilla, Netscape, Firefox
352 el
.addEventListener(evt
, normed_fn
, false);
354 el
.attachEvent('on' + evt
, normed_fn
);
358 Dygraph
.clipCanvas_
= function(cnv
, clip
) {
359 var ctx
= cnv
.getContext("2d");
361 ctx
.rect(clip
.left
, clip
.top
, clip
.width
, clip
.height
);
366 * Generates interface elements for the Dygraph: a containing div, a div to
367 * display the current point, and a textbox to adjust the rolling average
368 * period. Also creates the Renderer/Layout elements.
371 Dygraph
.prototype.createInterface_
= function() {
372 // Create the all-enclosing graph div
373 var enclosing
= this.maindiv_
;
375 this.graphDiv
= document
.createElement("div");
376 this.graphDiv
.style
.width
= this.width_
+ "px";
377 this.graphDiv
.style
.height
= this.height_
+ "px";
378 enclosing
.appendChild(this.graphDiv
);
382 left
: this.attr_("yAxisLabelWidth") + 2 * this.attr_("axisTickSize")
384 clip
.width
= this.width_
- clip
.left
- this.attr_("rightGap");
385 clip
.height
= this.height_
- this.attr_("axisLabelFontSize")
386 - 2 * this.attr_("axisTickSize");
387 this.clippingArea_
= clip
;
389 // Create the canvas for interactive parts of the chart.
390 this.canvas_
= Dygraph
.createCanvas();
391 this.canvas_
.style
.position
= "absolute";
392 this.canvas_
.width
= this.width_
;
393 this.canvas_
.height
= this.height_
;
394 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
395 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
396 this.graphDiv
.appendChild(this.canvas_
);
398 // ... and for static parts of the chart.
399 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
401 // Make sure we don't overdraw.
402 Dygraph
.clipCanvas_(this.hidden_
, this.clippingArea_
);
403 Dygraph
.clipCanvas_(this.canvas_
, this.clippingArea_
);
406 Dygraph
.addEvent(this.hidden_
, 'mousemove', function(e
) {
407 dygraph
.mouseMove_(e
);
409 Dygraph
.addEvent(this.hidden_
, 'mouseout', function(e
) {
410 dygraph
.mouseOut_(e
);
413 // Create the grapher
414 // TODO(danvk): why does the Layout need its own set of options?
415 this.layoutOptions_
= { 'xOriginIsZero': false };
416 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
417 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
418 Dygraph
.update(this.layoutOptions_
, {
419 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) });
421 this.layout_
= new DygraphLayout(this, this.layoutOptions_
);
423 // TODO(danvk): why does the Renderer need its own set of options?
424 this.renderOptions_
= { colorScheme
: this.colors_
,
426 axisLineWidth
: Dygraph
.AXIS_LINE_WIDTH
};
427 Dygraph
.update(this.renderOptions_
, this.attrs_
);
428 Dygraph
.update(this.renderOptions_
, this.user_attrs_
);
429 this.plotter_
= new DygraphCanvasRenderer(this,
430 this.hidden_
, this.layout_
,
431 this.renderOptions_
);
433 this.createStatusMessage_();
434 this.createRollInterface_();
435 this.createDragInterface_();
439 * Detach DOM elements in the dygraph and null out all data references.
440 * Calling this when you're done with a dygraph can dramatically reduce memory
441 * usage. See, e.g., the tests/perf.html example.
443 Dygraph
.prototype.destroy
= function() {
444 var removeRecursive
= function(node
) {
445 while (node
.hasChildNodes()) {
446 removeRecursive(node
.firstChild
);
447 node
.removeChild(node
.firstChild
);
450 removeRecursive(this.maindiv_
);
452 var nullOut
= function(obj
) {
454 if (typeof(obj
[n
]) === 'object') {
460 // These may not all be necessary, but it can't hurt...
461 nullOut(this.layout_
);
462 nullOut(this.plotter_
);
467 * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on
468 * this particular canvas. All Dygraph work is done on this.canvas_.
469 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
470 * @return {Object} The newly-created canvas
473 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
474 var h
= Dygraph
.createCanvas();
475 h
.style
.position
= "absolute";
476 // TODO(danvk): h should be offset from canvas. canvas needs to include
477 // some extra area to make it easier to zoom in on the far left and far
478 // right. h needs to be precisely the plot area, so that clipping occurs.
479 h
.style
.top
= canvas
.style
.top
;
480 h
.style
.left
= canvas
.style
.left
;
481 h
.width
= this.width_
;
482 h
.height
= this.height_
;
483 h
.style
.width
= this.width_
+ "px"; // for IE
484 h
.style
.height
= this.height_
+ "px"; // for IE
485 this.graphDiv
.appendChild(h
);
489 // Taken from MochiKit.Color
490 Dygraph
.hsvToRGB
= function (hue
, saturation
, value
) {
494 if (saturation
=== 0) {
499 var i
= Math
.floor(hue
* 6);
500 var f
= (hue
* 6) - i
;
501 var p
= value
* (1 - saturation
);
502 var q
= value
* (1 - (saturation
* f
));
503 var t
= value
* (1 - (saturation
* (1 - f
)));
505 case 1: red
= q
; green
= value
; blue
= p
; break;
506 case 2: red
= p
; green
= value
; blue
= t
; break;
507 case 3: red
= p
; green
= q
; blue
= value
; break;
508 case 4: red
= t
; green
= p
; blue
= value
; break;
509 case 5: red
= value
; green
= p
; blue
= q
; break;
510 case 6: // fall through
511 case 0: red
= value
; green
= t
; blue
= p
; break;
514 red
= Math
.floor(255 * red
+ 0.5);
515 green
= Math
.floor(255 * green
+ 0.5);
516 blue
= Math
.floor(255 * blue
+ 0.5);
517 return 'rgb(' + red
+ ',' + green
+ ',' + blue
+ ')';
522 * Generate a set of distinct colors for the data series. This is done with a
523 * color wheel. Saturation/Value are customizable, and the hue is
524 * equally-spaced around the color wheel. If a custom set of colors is
525 * specified, that is used instead.
528 Dygraph
.prototype.setColors_
= function() {
529 // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do
530 // away with this.renderOptions_.
531 var num
= this.attr_("labels").length
- 1;
533 var colors
= this.attr_('colors');
535 var sat
= this.attr_('colorSaturation') || 1.0;
536 var val
= this.attr_('colorValue') || 0.5;
537 var half
= Math
.ceil(num
/ 2);
538 for (var i
= 1; i
<= num
; i
++) {
539 if (!this.visibility()[i
-1]) continue;
540 // alternate colors for high contrast.
541 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
542 var hue
= (1.0 * idx
/ (1 + num
));
543 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
546 for (var i
= 0; i
< num
; i
++) {
547 if (!this.visibility()[i
]) continue;
548 var colorStr
= colors
[i
% colors
.length
];
549 this.colors_
.push(colorStr
);
553 // TODO(danvk): update this w/r
/t/ the
new options system
.
554 this.renderOptions_
.colorScheme
= this.colors_
;
555 Dygraph
.update(this.plotter_
.options
, this.renderOptions_
);
556 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
557 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
561 * Return the list of colors. This is either the list of colors passed in the
562 * attributes, or the autogenerated list of rgb(r,g,b) strings.
563 * @return {Array<string>} The list of colors.
565 Dygraph
.prototype.getColors
= function() {
569 // The following functions are from quirksmode.org with a modification for Safari from
570 // http://blog.firetree.net/2005/07/04/javascript-find-position/
571 // http://www.quirksmode.org/js
/findpos
.html
572 Dygraph
.findPosX
= function(obj
) {
577 curleft
+= obj
.offsetLeft
;
578 if(!obj
.offsetParent
)
580 obj
= obj
.offsetParent
;
587 Dygraph
.findPosY
= function(obj
) {
592 curtop
+= obj
.offsetTop
;
593 if(!obj
.offsetParent
)
595 obj
= obj
.offsetParent
;
605 * Create the div that contains information on the selected point(s)
606 * This goes in the top right of the canvas, unless an external div has already
610 Dygraph
.prototype.createStatusMessage_
= function(){
611 if (!this.attr_("labelsDiv")) {
612 var divWidth
= this.attr_('labelsDivWidth');
614 "position": "absolute",
617 "width": divWidth
+ "px",
619 "left": (this.width_
- divWidth
- 2) + "px",
620 "background": "white",
622 "overflow": "hidden"};
623 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
624 var div
= document
.createElement("div");
625 for (var name
in messagestyle
) {
626 if (messagestyle
.hasOwnProperty(name
)) {
627 div
.style
[name
] = messagestyle
[name
];
630 this.graphDiv
.appendChild(div
);
631 this.attrs_
.labelsDiv
= div
;
636 * Create the text box to adjust the averaging period
637 * @return {Object} The newly-created text box
640 Dygraph
.prototype.createRollInterface_
= function() {
641 var display
= this.attr_('showRoller') ? "block" : "none";
642 var textAttr
= { "position": "absolute",
644 "top": (this.plotter_
.area
.h
- 25) + "px",
645 "left": (this.plotter_
.area
.x
+ 1) + "px",
648 var roller
= document
.createElement("input");
649 roller
.type
= "text";
651 roller
.value
= this.rollPeriod_
;
652 for (var name
in textAttr
) {
653 if (textAttr
.hasOwnProperty(name
)) {
654 roller
.style
[name
] = textAttr
[name
];
658 var pa
= this.graphDiv
;
659 pa
.appendChild(roller
);
661 roller
.onchange
= function() { dygraph
.adjustRoll(roller
.value
); };
665 // These functions are taken from MochiKit.Signal
666 Dygraph
.pageX
= function(e
) {
668 return (!e
.pageX
|| e
.pageX
< 0) ? 0 : e
.pageX
;
671 var b
= document
.body
;
673 (de
.scrollLeft
|| b
.scrollLeft
) -
674 (de
.clientLeft
|| 0);
678 Dygraph
.pageY
= function(e
) {
680 return (!e
.pageY
|| e
.pageY
< 0) ? 0 : e
.pageY
;
683 var b
= document
.body
;
685 (de
.scrollTop
|| b
.scrollTop
) -
691 * Set up all the mouse handlers needed to capture dragging behavior for zoom
695 Dygraph
.prototype.createDragInterface_
= function() {
698 // Tracks whether the mouse is down right now
699 var isZooming
= false;
700 var isPanning
= false;
701 var dragStartX
= null;
702 var dragStartY
= null;
706 var draggingDate
= null;
707 var dateRange
= null;
709 // Utility function to convert page-wide coordinates to canvas coords
712 var getX
= function(e
) { return Dygraph
.pageX(e
) - px
};
713 var getY
= function(e
) { return Dygraph
.pageX(e
) - py
};
715 // Draw zoom rectangles when the mouse is down and the user moves around
716 Dygraph
.addEvent(this.hidden_
, 'mousemove', function(event
) {
718 dragEndX
= getX(event
);
719 dragEndY
= getY(event
);
721 self
.drawZoomRect_(dragStartX
, dragEndX
, prevEndX
);
723 } else if (isPanning
) {
724 dragEndX
= getX(event
);
725 dragEndY
= getY(event
);
727 // Want to have it so that:
728 // 1. draggingDate appears at dragEndX
729 // 2. daterange = (dateWindow_[1] - dateWindow_[0]) is unaltered.
731 self
.dateWindow_
[0] = draggingDate
- (dragEndX
/ self
.width_
) * dateRange
;
732 self
.dateWindow_
[1] = self
.dateWindow_
[0] + dateRange
;
733 self
.drawGraph_(self
.rawData_
);
737 // Track the beginning of drag events
738 Dygraph
.addEvent(this.hidden_
, 'mousedown', function(event
) {
739 px
= Dygraph
.findPosX(self
.canvas_
);
740 py
= Dygraph
.findPosY(self
.canvas_
);
741 dragStartX
= getX(event
);
742 dragStartY
= getY(event
);
744 if (event
.altKey
|| event
.shiftKey
) {
745 if (!self
.dateWindow_
) return; // have to be zoomed in to pan.
747 dateRange
= self
.dateWindow_
[1] - self
.dateWindow_
[0];
748 draggingDate
= (dragStartX
/ self
.width_
) * dateRange
+
755 // If the user releases the mouse button during a drag, but not over the
756 // canvas, then it doesn't count as a zooming action.
757 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
758 if (isZooming
|| isPanning
) {
771 // Temporarily cancel the dragging event when the mouse leaves the graph
772 Dygraph
.addEvent(this.hidden_
, 'mouseout', function(event
) {
779 // If the mouse is released on the canvas during a drag event, then it's a
780 // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels)
781 Dygraph
.addEvent(this.hidden_
, 'mouseup', function(event
) {
784 dragEndX
= getX(event
);
785 dragEndY
= getY(event
);
786 var regionWidth
= Math
.abs(dragEndX
- dragStartX
);
787 var regionHeight
= Math
.abs(dragEndY
- dragStartY
);
789 if (regionWidth
< 2 && regionHeight
< 2 &&
790 self
.attr_('clickCallback') != null &&
791 self
.lastx_
!= undefined
) {
792 // TODO(danvk): pass along more info about the points.
793 self
.attr_('clickCallback')(event
, self
.lastx_
, self
.selPoints_
);
796 if (regionWidth
>= 10) {
797 self
.doZoom_(Math
.min(dragStartX
, dragEndX
),
798 Math
.max(dragStartX
, dragEndX
));
800 self
.canvas_
.getContext("2d").clearRect(0, 0,
802 self
.canvas_
.height
);
816 // Double-clicking zooms back out
817 Dygraph
.addEvent(this.hidden_
, 'dblclick', function(event
) {
818 if (self
.dateWindow_
== null) return;
819 self
.dateWindow_
= null;
820 self
.drawGraph_(self
.rawData_
);
821 var minDate
= self
.rawData_
[0][0];
822 var maxDate
= self
.rawData_
[self
.rawData_
.length
- 1][0];
823 if (self
.attr_("zoomCallback")) {
824 self
.attr_("zoomCallback")(minDate
, maxDate
);
830 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
831 * up any previous zoom rectangles that were drawn. This could be optimized to
832 * avoid extra redrawing, but it's tricky to avoid interactions with the status
834 * @param {Number} startX The X position where the drag started, in canvas
836 * @param {Number} endX The current X position of the drag, in canvas coords.
837 * @param {Number} prevEndX The value of endX on the previous call to this
838 * function. Used to avoid excess redrawing
841 Dygraph
.prototype.drawZoomRect_
= function(startX
, endX
, prevEndX
) {
842 var ctx
= this.canvas_
.getContext("2d");
844 // Clean up from the previous rect if necessary
846 ctx
.clearRect(Math
.min(startX
, prevEndX
), 0,
847 Math
.abs(startX
- prevEndX
), this.height_
);
850 // Draw a light-grey rectangle to show the new viewing area
851 if (endX
&& startX
) {
852 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
853 ctx
.fillRect(Math
.min(startX
, endX
), 0,
854 Math
.abs(endX
- startX
), this.height_
);
859 * Zoom to something containing [lowX, highX]. These are pixel coordinates
860 * in the canvas. The exact zoom window may be slightly larger if there are no
861 * data points near lowX or highX. This function redraws the graph.
862 * @param {Number} lowX The leftmost pixel value that should be visible.
863 * @param {Number} highX The rightmost pixel value that should be visible.
866 Dygraph
.prototype.doZoom_
= function(lowX
, highX
) {
867 // Find the earliest and latest dates contained in this canvasx range.
868 var r
= this.toDataCoords(lowX
, null);
870 r
= this.toDataCoords(highX
, null);
873 this.dateWindow_
= [minDate
, maxDate
];
874 this.drawGraph_(this.rawData_
);
875 if (this.attr_("zoomCallback")) {
876 this.attr_("zoomCallback")(minDate
, maxDate
);
881 * When the mouse moves in the canvas, display information about a nearby data
882 * point and draw dots over those points in the data series. This function
883 * takes care of cleanup of previously-drawn dots.
884 * @param {Object} event The mousemove event from the browser.
887 Dygraph
.prototype.mouseMove_
= function(event
) {
888 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.hidden_
);
889 var points
= this.layout_
.points
;
894 // Loop through all the points and find the date nearest to our current
896 var minDist
= 1e+100;
898 for (var i
= 0; i
< points
.length
; i
++) {
899 var dist
= Math
.abs(points
[i
].canvasx
- canvasx
);
900 if (dist
> minDist
) continue;
904 if (idx
>= 0) lastx
= points
[idx
].xval
;
905 // Check that you can really highlight the last day's data
906 if (canvasx
> points
[points
.length
-1].canvasx
)
907 lastx
= points
[points
.length
-1].xval
;
909 // Extract the points we've selected
910 this.selPoints_
= [];
911 var l
= points
.length
;
912 if (!this.attr_("stackedGraph")) {
913 for (var i
= 0; i
< l
; i
++) {
914 if (points
[i
].xval
== lastx
) {
915 this.selPoints_
.push(points
[i
]);
919 // Need to 'unstack' points starting from the bottom
920 var cumulative_sum
= 0;
921 for (var i
= l
- 1; i
>= 0; i
--) {
922 if (points
[i
].xval
== lastx
) {
923 var p
= {}; // Clone the point since we modify it
924 for (var k
in points
[i
]) {
927 p
.yval
-= cumulative_sum
;
928 cumulative_sum
+= p
.yval
;
929 this.selPoints_
.push(p
);
932 this.selPoints_
.reverse();
935 if (this.attr_("highlightCallback")) {
936 var px
= this.lastx_
;
937 if (px
!== null && lastx
!= px
) {
938 // only fire if the selected point has changed.
939 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
);
943 // Save last x position for callbacks.
946 this.updateSelection_();
950 * Draw dots over the selectied points in the data series. This function
951 * takes care of cleanup of previously-drawn dots.
954 Dygraph
.prototype.updateSelection_
= function() {
955 // Clear the previously drawn vertical, if there is one
956 var circleSize
= this.attr_('highlightCircleSize');
957 var ctx
= this.canvas_
.getContext("2d");
958 if (this.previousVerticalX_
>= 0) {
959 var px
= this.previousVerticalX_
;
960 ctx
.clearRect(px
- circleSize
- 1, 0, 2 * circleSize
+ 2, this.height_
);
963 var isOK
= function(x
) { return x
&& !isNaN(x
); };
965 if (this.selPoints_
.length
> 0) {
966 var canvasx
= this.selPoints_
[0].canvasx
;
968 // Set the status message to indicate the selected point(s)
969 var replace
= this.attr_('xValueFormatter')(this.lastx_
, this) + ":";
970 var fmtFunc
= this.attr_('yValueFormatter');
971 var clen
= this.colors_
.length
;
973 if (this.attr_('showLabelsOnHighlight')) {
974 // Set the status message to indicate the selected point(s)
975 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
976 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
977 if (this.attr_("labelsSeparateLines")) {
980 var point
= this.selPoints_
[i
];
981 var c
= new RGBColor(this.colors_
[i
%clen
]);
982 var yval
= fmtFunc(point
.yval
);
983 replace
+= " <b><font color='" + c
.toHex() + "'>"
984 + point
.name
+ "</font></b>:"
988 this.attr_("labelsDiv").innerHTML
= replace
;
991 // Draw colored circles over the center of each selected point
993 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
994 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
996 ctx
.fillStyle
= this.plotter_
.colors
[this.selPoints_
[i
].name
];
997 ctx
.arc(canvasx
, this.selPoints_
[i
].canvasy
, circleSize
,
998 0, 2 * Math
.PI
, false);
1003 this.previousVerticalX_
= canvasx
;
1008 * Set manually set selected dots, and display information about them
1009 * @param int row number that should by highlighted
1010 * false value clears the selection
1013 Dygraph
.prototype.setSelection
= function(row
) {
1014 // Extract the points we've selected
1015 this.selPoints_
= [];
1018 if (row
!== false) {
1019 row
= row
-this.boundaryIds_
[0][0];
1022 if (row
!== false && row
>= 0) {
1023 for (var i
in this.layout_
.datasets
) {
1024 if (row
< this.layout_
.datasets
[i
].length
) {
1025 this.selPoints_
.push(this.layout_
.points
[pos
+row
]);
1027 pos
+= this.layout_
.datasets
[i
].length
;
1031 if (this.selPoints_
.length
) {
1032 this.lastx_
= this.selPoints_
[0].xval
;
1033 this.updateSelection_();
1036 this.clearSelection();
1042 * The mouse has left the canvas. Clear out whatever artifacts remain
1043 * @param {Object} event the mouseout event from the browser.
1046 Dygraph
.prototype.mouseOut_
= function(event
) {
1047 if (this.attr_("unhighlightCallback")) {
1048 this.attr_("unhighlightCallback")(event
);
1051 if (this.attr_("hideOverlayOnMouseOut")) {
1052 this.clearSelection();
1057 * Remove all selection from the canvas
1060 Dygraph
.prototype.clearSelection
= function() {
1061 // Get rid of the overlay data
1062 var ctx
= this.canvas_
.getContext("2d");
1063 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1064 this.attr_("labelsDiv").innerHTML
= "";
1065 this.selPoints_
= [];
1070 * Returns the number of the currently selected row
1071 * @return int row number, of -1 if nothing is selected
1074 Dygraph
.prototype.getSelection
= function() {
1075 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1079 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1080 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1081 return row
+ this.boundaryIds_
[0][0];
1087 Dygraph
.zeropad
= function(x
) {
1088 if (x
< 10) return "0" + x
; else return "" + x
;
1092 * Return a string version of the hours, minutes and seconds portion of a date.
1093 * @param {Number} date The JavaScript date (ms since epoch)
1094 * @return {String} A time of the form "HH:MM:SS"
1097 Dygraph
.hmsString_
= function(date
) {
1098 var zeropad
= Dygraph
.zeropad
;
1099 var d
= new Date(date
);
1100 if (d
.getSeconds()) {
1101 return zeropad(d
.getHours()) + ":" +
1102 zeropad(d
.getMinutes()) + ":" +
1103 zeropad(d
.getSeconds());
1105 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
1110 * Convert a JS date to a string appropriate to display on an axis that
1111 * is displaying values at the stated granularity.
1112 * @param {Date} date The date to format
1113 * @param {Number} granularity One of the Dygraph granularity constants
1114 * @return {String} The formatted date
1117 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1118 if (granularity
>= Dygraph
.MONTHLY
) {
1119 return date
.strftime('%b %y');
1121 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1122 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1123 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1125 return Dygraph
.hmsString_(date
.getTime());
1131 * Convert a JS date (millis since epoch) to YYYY/MM/DD
1132 * @param {Number} date The JavaScript date (ms since epoch)
1133 * @return {String} A date of the form "YYYY/MM/DD"
1136 Dygraph
.dateString_
= function(date
, self
) {
1137 var zeropad
= Dygraph
.zeropad
;
1138 var d
= new Date(date
);
1141 var year
= "" + d
.getFullYear();
1142 // Get a 0 padded month string
1143 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
1144 // Get a 0 padded day string
1145 var day
= zeropad(d
.getDate());
1148 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1149 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
1151 return year
+ "/" + month + "/" + day
+ ret
;
1155 * Round a number to the specified number of digits past the decimal point.
1156 * @param {Number} num The number to round
1157 * @param {Number} places The number of decimals to which to round
1158 * @return {Number} The rounded number
1161 Dygraph
.round_
= function(num
, places
) {
1162 var shift
= Math
.pow(10, places
);
1163 return Math
.round(num
* shift
)/shift
;
1167 * Fires when there's data available to be graphed.
1168 * @param {String} data Raw CSV data to be plotted
1171 Dygraph
.prototype.loadedEvent_
= function(data
) {
1172 this.rawData_
= this.parseCSV_(data
);
1173 this.drawGraph_(this.rawData_
);
1176 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1177 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1178 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1181 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1184 Dygraph
.prototype.addXTicks_
= function() {
1185 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1186 var startDate
, endDate
;
1187 if (this.dateWindow_
) {
1188 startDate
= this.dateWindow_
[0];
1189 endDate
= this.dateWindow_
[1];
1191 startDate
= this.rawData_
[0][0];
1192 endDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1195 var xTicks
= this.attr_('xTicker')(startDate
, endDate
, this);
1196 this.layout_
.updateOptions({xTicks
: xTicks
});
1199 // Time granularity enumeration
1200 Dygraph
.SECONDLY
= 0;
1201 Dygraph
.TWO_SECONDLY
= 1;
1202 Dygraph
.FIVE_SECONDLY
= 2;
1203 Dygraph
.TEN_SECONDLY
= 3;
1204 Dygraph
.THIRTY_SECONDLY
= 4;
1205 Dygraph
.MINUTELY
= 5;
1206 Dygraph
.TWO_MINUTELY
= 6;
1207 Dygraph
.FIVE_MINUTELY
= 7;
1208 Dygraph
.TEN_MINUTELY
= 8;
1209 Dygraph
.THIRTY_MINUTELY
= 9;
1210 Dygraph
.HOURLY
= 10;
1211 Dygraph
.TWO_HOURLY
= 11;
1212 Dygraph
.SIX_HOURLY
= 12;
1214 Dygraph
.WEEKLY
= 14;
1215 Dygraph
.MONTHLY
= 15;
1216 Dygraph
.QUARTERLY
= 16;
1217 Dygraph
.BIANNUAL
= 17;
1218 Dygraph
.ANNUAL
= 18;
1219 Dygraph
.DECADAL
= 19;
1220 Dygraph
.NUM_GRANULARITIES
= 20;
1222 Dygraph
.SHORT_SPACINGS
= [];
1223 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1224 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1225 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1226 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1227 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1228 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1229 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1230 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1231 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1232 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1233 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1234 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1235 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1236 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1237 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1241 // If we used this time granularity, how many ticks would there be?
1242 // This is only an approximation, but it's generally good enough.
1244 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1245 if (granularity
< Dygraph
.MONTHLY
) {
1246 // Generate one tick mark for every fixed interval of time.
1247 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1248 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1250 var year_mod
= 1; // e.g. to only print one point every 10 years.
1251 var num_months
= 12;
1252 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1253 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1254 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1255 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1257 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1258 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1259 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1265 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1266 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1268 // Returns an array containing {v: millis, label: label} dictionaries.
1270 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1271 var formatter
= this.attr_("xAxisLabelFormatter");
1273 if (granularity
< Dygraph
.MONTHLY
) {
1274 // Generate one tick mark for every fixed interval of time.
1275 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1276 var format
= '%d%b'; // e.g. "1Jan"
1278 // Find a time less than start_time which occurs on a "nice" time boundary
1279 // for this granularity.
1280 var g
= spacing
/ 1000;
1281 var d
= new Date(start_time
);
1282 if (g
<= 60) { // seconds
1283 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1287 if (g
<= 60) { // minutes
1288 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1293 if (g
<= 24) { // days
1294 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1299 if (g
== 7) { // one week
1300 d
.setDate(d
.getDate() - d
.getDay());
1305 start_time
= d
.getTime();
1307 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1308 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1311 // Display a tick mark on the first of a set of months of each year.
1312 // Years get a tick mark iff y % year_mod == 0. This is useful for
1313 // displaying a tick mark once every 10 years, say, on long time scales.
1315 var year_mod
= 1; // e.g. to only print one point every 10 years.
1317 if (granularity
== Dygraph
.MONTHLY
) {
1318 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1319 } else if (granularity
== Dygraph
.QUARTERLY
) {
1320 months
= [ 0, 3, 6, 9 ];
1321 } else if (granularity
== Dygraph
.BIANNUAL
) {
1323 } else if (granularity
== Dygraph
.ANNUAL
) {
1325 } else if (granularity
== Dygraph
.DECADAL
) {
1330 var start_year
= new Date(start_time
).getFullYear();
1331 var end_year
= new Date(end_time
).getFullYear();
1332 var zeropad
= Dygraph
.zeropad
;
1333 for (var i
= start_year
; i
<= end_year
; i
++) {
1334 if (i
% year_mod
!= 0) continue;
1335 for (var j
= 0; j
< months
.length
; j
++) {
1336 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1337 var t
= Date
.parse(date_str
);
1338 if (t
< start_time
|| t
> end_time
) continue;
1339 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1349 * Add ticks to the x-axis based on a date range.
1350 * @param {Number} startDate Start of the date window (millis since epoch)
1351 * @param {Number} endDate End of the date window (millis since epoch)
1352 * @return {Array.<Object>} Array of {label, value} tuples.
1355 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1357 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1358 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1359 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1366 return self
.GetXAxis(startDate
, endDate
, chosen
);
1368 // TODO(danvk): signal error.
1373 * Add ticks when the x axis has numbers on it (instead of dates)
1374 * @param {Number} startDate Start of the date window (millis since epoch)
1375 * @param {Number} endDate End of the date window (millis since epoch)
1376 * @return {Array.<Object>} Array of {label, value} tuples.
1379 Dygraph
.numericTicks
= function(minV
, maxV
, self
) {
1381 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1382 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1383 // The first spacing greater than pixelsPerYLabel is what we use.
1384 // TODO(danvk): version that works on a log scale.
1385 if (self
.attr_("labelsKMG2")) {
1386 var mults
= [1, 2, 4, 8];
1388 var mults
= [1, 2, 5];
1390 var scale
, low_val
, high_val
, nTicks
;
1391 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1392 var pixelsPerTick
= self
.attr_('pixelsPerYLabel');
1393 for (var i
= -10; i
< 50; i
++) {
1394 if (self
.attr_("labelsKMG2")) {
1395 var base_scale
= Math
.pow(16, i
);
1397 var base_scale
= Math
.pow(10, i
);
1399 for (var j
= 0; j
< mults
.length
; j
++) {
1400 scale
= base_scale
* mults
[j
];
1401 low_val
= Math
.floor(minV
/ scale
) * scale
;
1402 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1403 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
1404 var spacing
= self
.height_
/ nTicks
;
1405 // wish I could break out of both loops at once...
1406 if (spacing
> pixelsPerTick
) break;
1408 if (spacing
> pixelsPerTick
) break;
1411 // Construct labels for the ticks
1415 if (self
.attr_("labelsKMB")) {
1417 k_labels
= [ "K", "M", "B", "T" ];
1419 if (self
.attr_("labelsKMG2")) {
1420 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1422 k_labels
= [ "k", "M", "G", "T" ];
1425 // Allow reverse y-axis if it's explicitly requested.
1426 if (low_val
> high_val
) scale
*= -1;
1428 for (var i
= 0; i
< nTicks
; i
++) {
1429 var tickV
= low_val
+ i
* scale
;
1430 var absTickV
= Math
.abs(tickV
);
1431 var label
= Dygraph
.round_(tickV
, 2);
1432 if (k_labels
.length
) {
1433 // Round up to an appropriate unit.
1435 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
1436 if (absTickV
>= n
) {
1437 label
= Dygraph
.round_(tickV
/ n
, 1) + k_labels
[j
];
1442 ticks
.push( {label
: label
, v
: tickV
} );
1448 * Adds appropriate ticks on the y-axis
1449 * @param {Number} minY The minimum Y value in the data set
1450 * @param {Number} maxY The maximum Y value in the data set
1453 Dygraph
.prototype.addYTicks_
= function(minY
, maxY
) {
1454 // Set the number of ticks so that the labels are human-friendly.
1455 // TODO(danvk): make this an attribute as well.
1456 var ticks
= Dygraph
.numericTicks(minY
, maxY
, this);
1457 this.layout_
.updateOptions( { yAxis
: [minY
, maxY
],
1461 // Computes the range of the data series (including confidence intervals).
1462 // series is either [ [x1, y1], [x2, y2], ... ] or
1463 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1464 // Returns [low, high]
1465 Dygraph
.prototype.extremeValues_
= function(series
) {
1466 var minY
= null, maxY
= null;
1468 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1470 // With custom bars, maxY is the max of the high values.
1471 for (var j
= 0; j
< series
.length
; j
++) {
1472 var y
= series
[j
][1][0];
1474 var low
= y
- series
[j
][1][1];
1475 var high
= y
+ series
[j
][1][2];
1476 if (low
> y
) low
= y
; // this can happen with custom bars,
1477 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1478 if (maxY
== null || high
> maxY
) {
1481 if (minY
== null || low
< minY
) {
1486 for (var j
= 0; j
< series
.length
; j
++) {
1487 var y
= series
[j
][1];
1488 if (y
=== null || isNaN(y
)) continue;
1489 if (maxY
== null || y
> maxY
) {
1492 if (minY
== null || y
< minY
) {
1498 return [minY
, maxY
];
1502 * Update the graph with new data. Data is in the format
1503 * [ [date1, val1, val2, ...], [date2, val1, val2, ...] if errorBars=false
1504 * or, if errorBars=true,
1505 * [ [date1, [val1,stddev1], [val2,stddev2], ...], [date2, ...], ...]
1506 * @param {Array.<Object>} data The data (see above)
1509 Dygraph
.prototype.drawGraph_
= function(data
) {
1510 // This is used to set the second parameter to drawCallback, below.
1511 var is_initial_draw
= this.is_initial_draw_
;
1512 this.is_initial_draw_
= false;
1514 var minY
= null, maxY
= null;
1515 this.layout_
.removeAllDatasets();
1517 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
1519 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints');
1521 // Loop over the fields (series). Go from the last to the first,
1522 // because if they're stacked that's how we accumulate the values.
1524 var cumulative_y
= []; // For stacked series.
1527 // Loop over all fields and create datasets
1528 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
1529 if (!this.visibility()[i
- 1]) continue;
1532 for (var j
= 0; j
< data
.length
; j
++) {
1533 if (data
[j
][i
] != null || !connectSeparatedPoints
) {
1534 var date
= data
[j
][0];
1535 series
.push([date
, data
[j
][i
]]);
1538 series
= this.rollingAverage(series
, this.rollPeriod_
);
1540 // Prune down to the desired range, if necessary (for zooming)
1541 // Because there can be lines going to points outside of the visible area,
1542 // we actually prune to visible points, plus one on either side.
1543 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1544 if (this.dateWindow_
) {
1545 var low
= this.dateWindow_
[0];
1546 var high
= this.dateWindow_
[1];
1548 // TODO(danvk): do binary search instead of linear search.
1549 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1550 var firstIdx
= null, lastIdx
= null;
1551 for (var k
= 0; k
< series
.length
; k
++) {
1552 if (series
[k
][0] >= low
&& firstIdx
=== null) {
1555 if (series
[k
][0] <= high
) {
1559 if (firstIdx
=== null) firstIdx
= 0;
1560 if (firstIdx
> 0) firstIdx
--;
1561 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
1562 if (lastIdx
< series
.length
- 1) lastIdx
++;
1563 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
1564 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
1565 pruned
.push(series
[k
]);
1569 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
1572 var extremes
= this.extremeValues_(series
);
1573 var thisMinY
= extremes
[0];
1574 var thisMaxY
= extremes
[1];
1575 if (minY
=== null || thisMinY
< minY
) minY
= thisMinY
;
1576 if (maxY
=== null || thisMaxY
> maxY
) maxY
= thisMaxY
;
1579 for (var j
=0; j
<series
.length
; j
++) {
1580 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
1583 } else if (this.attr_("stackedGraph")) {
1584 var l
= series
.length
;
1586 for (var j
= 0; j
< l
; j
++) {
1587 // If one data set has a NaN, let all subsequent stacked
1588 // sets inherit the NaN -- only start at 0 for the first set.
1589 var x
= series
[j
][0];
1590 if (cumulative_y
[x
] === undefined
)
1591 cumulative_y
[x
] = 0;
1593 actual_y
= series
[j
][1];
1594 cumulative_y
[x
] += actual_y
;
1596 series
[j
] = [x
, cumulative_y
[x
]]
1598 if (!maxY
|| cumulative_y
[x
] > maxY
)
1599 maxY
= cumulative_y
[x
];
1603 datasets
[i
] = series
;
1606 for (var i
= 1; i
< datasets
.length
; i
++) {
1607 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
1610 // Use some heuristics to come up with a good maxY value, unless it's been
1611 // set explicitly by the user.
1612 if (this.valueRange_
!= null) {
1613 this.addYTicks_(this.valueRange_
[0], this.valueRange_
[1]);
1614 this.displayedYRange_
= this.valueRange_
;
1616 // This affects the calculation of span, below.
1617 if (this.attr_("includeZero") && minY
> 0) {
1621 // Add some padding and round up to an integer to be human-friendly.
1622 var span
= maxY
- minY
;
1623 // special case: if we have no sense of scale, use +/-10% of the sole value
.
1624 if (span
== 0) { span
= maxY
; }
1625 var maxAxisY
= maxY
+ 0.1 * span
;
1626 var minAxisY
= minY
- 0.1 * span
;
1628 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
1629 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
1630 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
1632 if (this.attr_("includeZero")) {
1633 if (maxY
< 0) maxAxisY
= 0;
1634 if (minY
> 0) minAxisY
= 0;
1637 this.addYTicks_(minAxisY
, maxAxisY
);
1638 this.displayedYRange_
= [minAxisY
, maxAxisY
];
1643 // Tell PlotKit to use this new data and render itself
1644 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
1645 this.layout_
.evaluateWithError();
1646 this.plotter_
.clear();
1647 this.plotter_
.render();
1648 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
1649 this.canvas_
.height
);
1651 if (this.attr_("drawCallback") !== null) {
1652 this.attr_("drawCallback")(this, is_initial_draw
);
1657 * Calculates the rolling average of a data set.
1658 * If originalData is [label, val], rolls the average of those.
1659 * If originalData is [label, [, it's interpreted as [value, stddev]
1660 * and the roll is returned in the same form, with appropriately reduced
1661 * stddev for each value.
1662 * Note that this is where fractional input (i.e. '5/10') is converted into
1664 * @param {Array} originalData The data in the appropriate format (see above)
1665 * @param {Number} rollPeriod The number of days over which to average the data
1667 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
1668 if (originalData
.length
< 2)
1669 return originalData
;
1670 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
1671 var rollingData
= [];
1672 var sigma
= this.attr_("sigma");
1674 if (this.fractions_
) {
1676 var den
= 0; // numerator/denominator
1678 for (var i
= 0; i
< originalData
.length
; i
++) {
1679 num
+= originalData
[i
][1][0];
1680 den
+= originalData
[i
][1][1];
1681 if (i
- rollPeriod
>= 0) {
1682 num
-= originalData
[i
- rollPeriod
][1][0];
1683 den
-= originalData
[i
- rollPeriod
][1][1];
1686 var date
= originalData
[i
][0];
1687 var value
= den
? num
/ den
: 0.0;
1688 if (this.attr_("errorBars")) {
1689 if (this.wilsonInterval_
) {
1690 // For more details on this confidence interval, see:
1691 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
1693 var p
= value
< 0 ? 0 : value
, n
= den
;
1694 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
1695 var denom
= 1 + sigma
* sigma
/ den
;
1696 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
1697 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
1698 rollingData
[i
] = [date
,
1699 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
1701 rollingData
[i
] = [date
, [0, 0, 0]];
1704 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
1705 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
1708 rollingData
[i
] = [date
, mult
* value
];
1711 } else if (this.attr_("customBars")) {
1716 for (var i
= 0; i
< originalData
.length
; i
++) {
1717 var data
= originalData
[i
][1];
1719 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
1721 if (y
!= null && !isNaN(y
)) {
1727 if (i
- rollPeriod
>= 0) {
1728 var prev
= originalData
[i
- rollPeriod
];
1729 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
1736 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
1737 1.0 * (mid
- low
) / count
,
1738 1.0 * (high
- mid
) / count
]];
1741 // Calculate the rolling average for the first rollPeriod - 1 points where
1742 // there is not enough data to roll over the full number of days
1743 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
1744 if (!this.attr_("errorBars")){
1745 if (rollPeriod
== 1) {
1746 return originalData
;
1749 for (var i
= 0; i
< originalData
.length
; i
++) {
1752 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
1753 var y
= originalData
[j
][1];
1754 if (y
== null || isNaN(y
)) continue;
1756 sum
+= originalData
[j
][1];
1759 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
1761 rollingData
[i
] = [originalData
[i
][0], null];
1766 for (var i
= 0; i
< originalData
.length
; i
++) {
1770 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
1771 var y
= originalData
[j
][1][0];
1772 if (y
== null || isNaN(y
)) continue;
1774 sum
+= originalData
[j
][1][0];
1775 variance
+= Math
.pow(originalData
[j
][1][1], 2);
1778 var stddev
= Math
.sqrt(variance
) / num_ok
;
1779 rollingData
[i
] = [originalData
[i
][0],
1780 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
1782 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
1792 * Parses a date, returning the number of milliseconds since epoch. This can be
1793 * passed in as an xValueParser in the Dygraph constructor.
1794 * TODO(danvk): enumerate formats that this understands.
1795 * @param {String} A date in YYYYMMDD format.
1796 * @return {Number} Milliseconds since epoch.
1799 Dygraph
.dateParser
= function(dateStr
, self
) {
1802 if (dateStr
.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12'
1803 dateStrSlashed
= dateStr
.replace("-", "/", "g");
1804 while (dateStrSlashed
.search("-") != -1) {
1805 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
1807 d
= Date
.parse(dateStrSlashed
);
1808 } else if (dateStr
.length
== 8) { // e.g. '20090712'
1809 // TODO(danvk): remove support for this format. It's confusing.
1810 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
1811 + "/" + dateStr
.substr(6,2);
1812 d
= Date
.parse(dateStrSlashed
);
1814 // Any format that Date.parse will accept, e.g. "2009/07/12" or
1815 // "2009/07/12 12:34:56"
1816 d
= Date
.parse(dateStr
);
1819 if (!d
|| isNaN(d
)) {
1820 self
.error("Couldn't parse " + dateStr
+ " as a date");
1826 * Detects the type of the str (date or numeric) and sets the various
1827 * formatting attributes in this.attrs_ based on this type.
1828 * @param {String} str An x value.
1831 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
1833 if (str
.indexOf('-') >= 0 ||
1834 str
.indexOf('/') >= 0 ||
1835 isNaN(parseFloat(str
))) {
1837 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
1838 // TODO(danvk): remove support for this format.
1843 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
1844 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
1845 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
1846 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
1848 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
1849 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
1850 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
1851 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
1856 * Parses a string in a special csv format. We expect a csv file where each
1857 * line is a date point, and the first field in each line is the date string.
1858 * We also expect that all remaining fields represent series.
1859 * if the errorBars attribute is set, then interpret the fields as:
1860 * date, series1, stddev1, series2, stddev2, ...
1861 * @param {Array.<Object>} data See above.
1864 * @return Array.<Object> An array with one entry for each row. These entries
1865 * are an array of cells in that row. The first entry is the parsed x-value for
1866 * the row. The second, third, etc. are the y-values. These can take on one of
1867 * three forms, depending on the CSV and constructor parameters:
1869 * 2. [ value, stddev ]
1870 * 3. [ low value, center value, high value ]
1872 Dygraph
.prototype.parseCSV_
= function(data
) {
1874 var lines
= data
.split("\n");
1876 // Use the default delimiter or fall back to a tab if that makes sense.
1877 var delim
= this.attr_('delimiter');
1878 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
1883 if (this.labelsFromCSV_
) {
1885 this.attrs_
.labels
= lines
[0].split(delim
);
1889 var defaultParserSet
= false; // attempt to auto-detect x value type
1890 var expectedCols
= this.attr_("labels").length
;
1891 var outOfOrder
= false;
1892 for (var i
= start
; i
< lines
.length
; i
++) {
1893 var line
= lines
[i
];
1894 if (line
.length
== 0) continue; // skip blank lines
1895 if (line
[0] == '#') continue; // skip comment lines
1896 var inFields
= line
.split(delim
);
1897 if (inFields
.length
< 2) continue;
1900 if (!defaultParserSet
) {
1901 this.detectTypeFromString_(inFields
[0]);
1902 xParser
= this.attr_("xValueParser");
1903 defaultParserSet
= true;
1905 fields
[0] = xParser(inFields
[0], this);
1907 // If fractions are expected, parse the numbers as "A/B
"
1908 if (this.fractions_) {
1909 for (var j = 1; j < inFields.length; j++) {
1910 // TODO(danvk): figure out an appropriate way to flag parse errors.
1911 var vals = inFields[j].split("/");
1912 fields[j] = [parseFloat(vals[0]), parseFloat(vals[1])];
1914 } else if (this.attr_("errorBars
")) {
1915 // If there are error bars, values are (value, stddev) pairs
1916 for (var j = 1; j < inFields.length; j += 2)
1917 fields[(j + 1) / 2] = [parseFloat(inFields[j]),
1918 parseFloat(inFields[j + 1])];
1919 } else if (this.attr_("customBars
")) {
1920 // Bars are a low;center;high tuple
1921 for (var j = 1; j < inFields.length; j++) {
1922 var vals = inFields[j].split(";");
1923 fields[j] = [ parseFloat(vals[0]),
1924 parseFloat(vals[1]),
1925 parseFloat(vals[2]) ];
1928 // Values are just numbers
1929 for (var j = 1; j < inFields.length; j++) {
1930 fields[j] = parseFloat(inFields[j]);
1933 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
1938 if (fields.length != expectedCols) {
1939 this.error("Number of columns
in line
" + i + " (" + fields.length +
1940 ") does not agree
with number of
labels (" + expectedCols +
1946 this.warn("CSV is out of order
; order it correctly to speed loading
.");
1947 ret.sort(function(a,b) { return a[0] - b[0] });
1954 * The user has provided their data as a pre-packaged JS array. If the x values
1955 * are numeric, this is the same as dygraphs' internal format. If the x values
1956 * are dates, we need to convert them from Date objects to ms since epoch.
1957 * @param {Array.<Object>} data
1958 * @return {Array.<Object>} data with numeric x values.
1960 Dygraph.prototype.parseArray_ = function(data) {
1961 // Peek at the first x value to see if it's numeric.
1962 if (data.length == 0) {
1963 this.error("Can
't plot empty data set");
1966 if (data[0].length == 0) {
1967 this.error("Data set cannot contain an empty row");
1971 if (this.attr_("labels") == null) {
1972 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
1973 "in the options parameter");
1974 this.attrs_.labels = [ "X" ];
1975 for (var i = 1; i < data[0].length; i++) {
1976 this.attrs_.labels.push("Y" + i);
1980 if (Dygraph.isDateLike(data[0][0])) {
1981 // Some intelligent defaults for a date x-axis.
1982 this.attrs_.xValueFormatter = Dygraph.dateString_;
1983 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
1984 this.attrs_.xTicker = Dygraph.dateTicker;
1986 // Assume they're all dates
.
1987 var parsedData
= Dygraph
.clone(data
);
1988 for (var i
= 0; i
< data
.length
; i
++) {
1989 if (parsedData
[i
].length
== 0) {
1990 this.error("Row " << (1 + i
) << " of data is empty");
1993 if (parsedData
[i
][0] == null
1994 || typeof(parsedData
[i
][0].getTime
) != 'function'
1995 || isNaN(parsedData
[i
][0].getTime())) {
1996 this.error("x value in row " + (1 + i
) + " is not a Date");
1999 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2003 // Some intelligent defaults for a numeric x-axis.
2004 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2005 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2011 * Parses a DataTable object from gviz.
2012 * The data is expected to have a first column that is either a date or a
2013 * number. All subsequent columns must be numbers. If there is a clear mismatch
2014 * between this.xValueParser_ and the type of the first column, it will be
2015 * fixed. Returned value is in the same format as return value of parseCSV_.
2016 * @param {Array.<Object>} data See above.
2019 Dygraph
.prototype.parseDataTable_
= function(data
) {
2020 var cols
= data
.getNumberOfColumns();
2021 var rows
= data
.getNumberOfRows();
2023 // Read column labels
2025 for (var i
= 0; i
< cols
; i
++) {
2026 labels
.push(data
.getColumnLabel(i
));
2027 if (i
!= 0 && this.attr_("errorBars")) i
+= 1;
2029 this.attrs_
.labels
= labels
;
2030 cols
= labels
.length
;
2032 var indepType
= data
.getColumnType(0);
2033 if (indepType
== 'date' || indepType
== 'datetime') {
2034 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2035 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2036 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2037 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2038 } else if (indepType
== 'number') {
2039 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2040 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2041 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2042 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2044 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2045 "column 1 of DataTable input (Got '" + indepType
+ "')");
2050 var outOfOrder
= false;
2051 for (var i
= 0; i
< rows
; i
++) {
2053 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2054 data
.getValue(i
, 0) === null) {
2055 this.warning("Ignoring row " + i
+
2056 " of DataTable because of undefined or null first column.");
2060 if (indepType
== 'date' || indepType
== 'datetime') {
2061 row
.push(data
.getValue(i
, 0).getTime());
2063 row
.push(data
.getValue(i
, 0));
2065 if (!this.attr_("errorBars")) {
2066 for (var j
= 1; j
< cols
; j
++) {
2067 row
.push(data
.getValue(i
, j
));
2070 for (var j
= 0; j
< cols
- 1; j
++) {
2071 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2074 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2081 this.warn("DataTable is out of order; order it correctly to speed loading.");
2082 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
2087 // These functions are all based on MochiKit.
2088 Dygraph
.update
= function (self
, o
) {
2089 if (typeof(o
) != 'undefined' && o
!== null) {
2091 if (o
.hasOwnProperty(k
)) {
2099 Dygraph
.isArrayLike
= function (o
) {
2100 var typ
= typeof(o
);
2102 (typ
!= 'object' && !(typ
== 'function' &&
2103 typeof(o
.item
) == 'function')) ||
2105 typeof(o
.length
) != 'number' ||
2113 Dygraph
.isDateLike
= function (o
) {
2114 if (typeof(o
) != "object" || o
=== null ||
2115 typeof(o
.getTime
) != 'function') {
2121 Dygraph
.clone
= function(o
) {
2122 // TODO(danvk): figure out how MochiKit's version works
2124 for (var i
= 0; i
< o
.length
; i
++) {
2125 if (Dygraph
.isArrayLike(o
[i
])) {
2126 r
.push(Dygraph
.clone(o
[i
]));
2136 * Get the CSV data. If it's in a function, call that function. If it's in a
2137 * file, do an XMLHttpRequest to get it.
2140 Dygraph
.prototype.start_
= function() {
2141 if (typeof this.file_
== 'function') {
2142 // CSV string. Pretend we got it via XHR.
2143 this.loadedEvent_(this.file_());
2144 } else if (Dygraph
.isArrayLike(this.file_
)) {
2145 this.rawData_
= this.parseArray_(this.file_
);
2146 this.drawGraph_(this.rawData_
);
2147 } else if (typeof this.file_
== 'object' &&
2148 typeof this.file_
.getColumnRange
== 'function') {
2149 // must be a DataTable from gviz.
2150 this.rawData_
= this.parseDataTable_(this.file_
);
2151 this.drawGraph_(this.rawData_
);
2152 } else if (typeof this.file_
== 'string') {
2153 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2154 if (this.file_
.indexOf('\n') >= 0) {
2155 this.loadedEvent_(this.file_
);
2157 var req
= new XMLHttpRequest();
2159 req
.onreadystatechange
= function () {
2160 if (req
.readyState
== 4) {
2161 if (req
.status
== 200) {
2162 caller
.loadedEvent_(req
.responseText
);
2167 req
.open("GET", this.file_
, true);
2171 this.error("Unknown data format: " + (typeof this.file_
));
2176 * Changes various properties of the graph. These can include:
2178 * <li>file: changes the source data for the graph</li>
2179 * <li>errorBars: changes whether the data contains stddev</li>
2181 * @param {Object} attrs The new properties and values
2183 Dygraph
.prototype.updateOptions
= function(attrs
) {
2184 // TODO(danvk): this is a mess. Rethink this function.
2185 if (attrs
.rollPeriod
) {
2186 this.rollPeriod_
= attrs
.rollPeriod
;
2188 if (attrs
.dateWindow
) {
2189 this.dateWindow_
= attrs
.dateWindow
;
2191 if (attrs
.valueRange
) {
2192 this.valueRange_
= attrs
.valueRange
;
2194 Dygraph
.update(this.user_attrs_
, attrs
);
2196 this.labelsFromCSV_
= (this.attr_("labels") == null);
2198 // TODO(danvk): this doesn't match the constructor logic
2199 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
2200 if (attrs
['file']) {
2201 this.file_
= attrs
['file'];
2204 this.drawGraph_(this.rawData_
);
2209 * Resizes the dygraph. If no parameters are specified, resizes to fill the
2210 * containing div (which has presumably changed size since the dygraph was
2211 * instantiated. If the width/height are specified, the div will be resized.
2213 * This is far more efficient than destroying and re-instantiating a
2214 * Dygraph, since it doesn't have to reparse the underlying data.
2216 * @param {Number} width Width (in pixels)
2217 * @param {Number} height Height (in pixels)
2219 Dygraph
.prototype.resize
= function(width
, height
) {
2220 if (this.resize_lock
) {
2223 this.resize_lock
= true;
2225 if ((width
=== null) != (height
=== null)) {
2226 this.warn("Dygraph.resize() should be called with zero parameters or " +
2227 "two non-NULL parameters. Pretending it was zero.");
2228 width
= height
= null;
2231 // TODO(danvk): there should be a clear() method.
2232 this.maindiv_
.innerHTML
= "";
2233 this.attrs_
.labelsDiv
= null;
2236 this.maindiv_
.style
.width
= width
+ "px";
2237 this.maindiv_
.style
.height
= height
+ "px";
2238 this.width_
= width
;
2239 this.height_
= height
;
2241 this.width_
= this.maindiv_
.offsetWidth
;
2242 this.height_
= this.maindiv_
.offsetHeight
;
2245 this.createInterface_();
2246 this.drawGraph_(this.rawData_
);
2248 this.resize_lock
= false;
2252 * Adjusts the number of days in the rolling average. Updates the graph to
2253 * reflect the new averaging period.
2254 * @param {Number} length Number of days over which to average the data.
2256 Dygraph
.prototype.adjustRoll
= function(length
) {
2257 this.rollPeriod_
= length
;
2258 this.drawGraph_(this.rawData_
);
2262 * Returns a boolean array of visibility statuses.
2264 Dygraph
.prototype.visibility
= function() {
2265 // Do lazy-initialization, so that this happens after we know the number of
2267 if (!this.attr_("visibility")) {
2268 this.attrs_
["visibility"] = [];
2270 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
2271 this.attr_("visibility").push(true);
2273 return this.attr_("visibility");
2277 * Changes the visiblity of a series.
2279 Dygraph
.prototype.setVisibility
= function(num
, value
) {
2280 var x
= this.visibility();
2281 if (num
< 0 && num
>= x
.length
) {
2282 this.warn("invalid series number in setVisibility: " + num
);
2285 this.drawGraph_(this.rawData_
);
2290 * Create a new canvas element. This is more complex than a simple
2291 * document.createElement("canvas") because of IE and excanvas.
2293 Dygraph
.createCanvas
= function() {
2294 var canvas
= document
.createElement("canvas");
2296 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
2298 canvas
= G_vmlCanvasManager
.initElement(canvas
);
2306 * A wrapper around Dygraph that implements the gviz API.
2307 * @param {Object} container The DOM object the visualization should live in.
2309 Dygraph
.GVizChart
= function(container
) {
2310 this.container
= container
;
2313 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
2314 this.container
.innerHTML
= '';
2315 this.date_graph
= new Dygraph(this.container
, data
, options
);
2319 * Google charts compatible setSelection
2320 * Only row selection is supported, all points in the row will be highlighted
2321 * @param {Array} array of the selected cells
2324 Dygraph
.GVizChart
.prototype.setSelection
= function(selection_array
) {
2326 if (selection_array
.length
) {
2327 row
= selection_array
[0].row
;
2329 this.date_graph
.setSelection(row
);
2333 * Google charts compatible getSelection implementation
2334 * @return {Array} array of the selected cells
2337 Dygraph
.GVizChart
.prototype.getSelection
= function() {
2340 var row
= this.date_graph
.getSelection();
2342 if (row
< 0) return selection
;
2345 for (var i
in this.date_graph
.layout_
.datasets
) {
2346 selection
.push({row
: row
, column
: col
});
2353 // Older pages may still use this name.
2354 DateGraph
= Dygraph
;