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,
99 axisLabelFontSize
: 14,
105 xValueFormatter
: Dygraph
.dateString_
,
106 xValueParser
: Dygraph
.dateParser
,
107 xTicker
: Dygraph
.dateTicker
,
114 wilsonInterval
: true, // only relevant if fractions is true
118 // Various logging levels.
124 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
125 // Labels is no longer a constructor parameter, since it's typically set
126 // directly from the data source. It also conains a name for the x-axis,
127 // which the previous constructor form did not.
128 if (labels
!= null) {
129 var new_labels
= ["Date"];
130 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
131 Dygraph
.update(attrs
, { 'labels': new_labels
});
133 this.__init__(div
, file
, attrs
);
137 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
138 * and interaction <canvas> inside of it. See the constructor for details
140 * @param {String | Function} file Source data
141 * @param {Array.<String>} labels Names of the data series
142 * @param {Object} attrs Miscellaneous other options
145 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
146 // Support two-argument constructor
147 if (attrs
== null) { attrs
= {}; }
149 // Copy the important bits into the object
150 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
153 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
154 this.previousVerticalX_
= -1;
155 this.fractions_
= attrs
.fractions
|| false;
156 this.dateWindow_
= attrs
.dateWindow
|| null;
157 this.valueRange_
= attrs
.valueRange
|| null;
158 this.wilsonInterval_
= attrs
.wilsonInterval
|| true;
160 // Clear the div. This ensure that, if multiple dygraphs are passed the same
161 // div, then only one will be drawn.
164 // If the div isn't already sized then give it a default size.
165 if (div
.style
.width
== '') {
166 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
168 if (div
.style
.height
== '') {
169 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
171 this.width_
= parseInt(div
.style
.width
, 10);
172 this.height_
= parseInt(div
.style
.height
, 10);
174 // Dygraphs has many options, some of which interact with one another.
175 // To keep track of everything, we maintain two sets of options:
177 // this.user_attrs_ only options explicitly set by the user.
178 // this.attrs_ defaults, options derived from user_attrs_, data.
180 // Options are then accessed this.attr_('attr'), which first looks at
181 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
182 // defaults without overriding behavior that the user specifically asks for.
183 this.user_attrs_
= {};
184 Dygraph
.update(this.user_attrs_
, attrs
);
187 Dygraph
.update(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
189 // Make a note of whether labels will be pulled from the CSV file.
190 this.labelsFromCSV_
= (this.attr_("labels") == null);
192 // Create the containing DIV and other interactive elements
193 this.createInterface_();
198 Dygraph
.prototype.attr_
= function(name
) {
199 if (typeof(this.user_attrs_
[name
]) != 'undefined') {
200 return this.user_attrs_
[name
];
201 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
202 return this.attrs_
[name
];
208 // TODO(danvk): any way I can get the line numbers to be this.warn call?
209 Dygraph
.prototype.log
= function(severity
, message
) {
210 if (typeof(console
) != 'undefined') {
213 console
.debug('dygraphs: ' + message
);
216 console
.info('dygraphs: ' + message
);
218 case Dygraph
.WARNING
:
219 console
.warn('dygraphs: ' + message
);
222 console
.error('dygraphs: ' + message
);
227 Dygraph
.prototype.info
= function(message
) {
228 this.log(Dygraph
.INFO
, message
);
230 Dygraph
.prototype.warn
= function(message
) {
231 this.log(Dygraph
.WARNING
, message
);
233 Dygraph
.prototype.error
= function(message
) {
234 this.log(Dygraph
.ERROR
, message
);
238 * Returns the current rolling period, as set by the user or an option.
239 * @return {Number} The number of days in the rolling window
241 Dygraph
.prototype.rollPeriod
= function() {
242 return this.rollPeriod_
;
245 Dygraph
.addEvent
= function(el
, evt
, fn
) {
246 var normed_fn
= function(e
) {
247 if (!e
) var e
= window
.event
;
250 if (window
.addEventListener
) { // Mozilla, Netscape, Firefox
251 el
.addEventListener(evt
, normed_fn
, false);
253 el
.attachEvent('on' + evt
, normed_fn
);
258 * Generates interface elements for the Dygraph: a containing div, a div to
259 * display the current point, and a textbox to adjust the rolling average
260 * period. Also creates the Renderer/Layout elements.
263 Dygraph
.prototype.createInterface_
= function() {
264 // Create the all-enclosing graph div
265 var enclosing
= this.maindiv_
;
267 this.graphDiv
= document
.createElement("div");
268 this.graphDiv
.style
.width
= this.width_
+ "px";
269 this.graphDiv
.style
.height
= this.height_
+ "px";
270 enclosing
.appendChild(this.graphDiv
);
272 // Create the canvas for interactive parts of the chart.
273 // this.canvas_ = document.createElement("canvas");
274 this.canvas_
= Dygraph
.createCanvas();
275 this.canvas_
.style
.position
= "absolute";
276 this.canvas_
.width
= this.width_
;
277 this.canvas_
.height
= this.height_
;
278 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
279 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
280 this.graphDiv
.appendChild(this.canvas_
);
282 // ... and for static parts of the chart.
283 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
286 Dygraph
.addEvent(this.hidden_
, 'mousemove', function(e
) {
287 dygraph
.mouseMove_(e
);
289 Dygraph
.addEvent(this.hidden_
, 'mouseout', function(e
) {
290 dygraph
.mouseOut_(e
);
293 // Create the grapher
294 // TODO(danvk): why does the Layout need its own set of options?
295 this.layoutOptions_
= { 'xOriginIsZero': false };
296 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
297 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
298 Dygraph
.update(this.layoutOptions_
, {
299 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) });
301 this.layout_
= new DygraphLayout(this, this.layoutOptions_
);
303 // TODO(danvk): why does the Renderer need its own set of options?
304 this.renderOptions_
= { colorScheme
: this.colors_
,
306 axisLineWidth
: Dygraph
.AXIS_LINE_WIDTH
};
307 Dygraph
.update(this.renderOptions_
, this.attrs_
);
308 Dygraph
.update(this.renderOptions_
, this.user_attrs_
);
309 this.plotter_
= new DygraphCanvasRenderer(this,
310 this.hidden_
, this.layout_
,
311 this.renderOptions_
);
313 this.createStatusMessage_();
314 this.createRollInterface_();
315 this.createDragInterface_();
319 * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on
320 * this particular canvas. All Dygraph work is done on this.canvas_.
321 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
322 * @return {Object} The newly-created canvas
325 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
326 // var h = document.createElement("canvas");
327 var h
= Dygraph
.createCanvas();
328 h
.style
.position
= "absolute";
329 h
.style
.top
= canvas
.style
.top
;
330 h
.style
.left
= canvas
.style
.left
;
331 h
.width
= this.width_
;
332 h
.height
= this.height_
;
333 h
.style
.width
= this.width_
+ "px"; // for IE
334 h
.style
.height
= this.height_
+ "px"; // for IE
335 this.graphDiv
.appendChild(h
);
339 // Taken from MochiKit.Color
340 Dygraph
.hsvToRGB
= function (hue
, saturation
, value
) {
344 if (saturation
=== 0) {
349 var i
= Math
.floor(hue
* 6);
350 var f
= (hue
* 6) - i
;
351 var p
= value
* (1 - saturation
);
352 var q
= value
* (1 - (saturation
* f
));
353 var t
= value
* (1 - (saturation
* (1 - f
)));
355 case 1: red
= q
; green
= value
; blue
= p
; break;
356 case 2: red
= p
; green
= value
; blue
= t
; break;
357 case 3: red
= p
; green
= q
; blue
= value
; break;
358 case 4: red
= t
; green
= p
; blue
= value
; break;
359 case 5: red
= value
; green
= p
; blue
= q
; break;
360 case 6: // fall through
361 case 0: red
= value
; green
= t
; blue
= p
; break;
364 red
= Math
.floor(255 * red
+ 0.5);
365 green
= Math
.floor(255 * green
+ 0.5);
366 blue
= Math
.floor(255 * blue
+ 0.5);
367 return 'rgb(' + red
+ ',' + green
+ ',' + blue
+ ')';
372 * Generate a set of distinct colors for the data series. This is done with a
373 * color wheel. Saturation/Value are customizable, and the hue is
374 * equally-spaced around the color wheel. If a custom set of colors is
375 * specified, that is used instead.
378 Dygraph
.prototype.setColors_
= function() {
379 // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do
380 // away with this.renderOptions_.
381 var num
= this.attr_("labels").length
- 1;
383 var colors
= this.attr_('colors');
385 var sat
= this.attr_('colorSaturation') || 1.0;
386 var val
= this.attr_('colorValue') || 0.5;
387 for (var i
= 1; i
<= num
; i
++) {
388 var hue
= (1.0*i
/(1+num
));
389 this.colors_
.push( Dygraph
.hsvToRGB(hue
, sat
, val
) );
392 for (var i
= 0; i
< num
; i
++) {
393 var colorStr
= colors
[i
% colors
.length
];
394 this.colors_
.push(colorStr
);
398 // TODO(danvk): update this w/r
/t/ the
new options system
.
399 this.renderOptions_
.colorScheme
= this.colors_
;
400 Dygraph
.update(this.plotter_
.options
, this.renderOptions_
);
401 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
402 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
405 // The following functions are from quirksmode.org
406 // http://www.quirksmode.org/js
/findpos
.html
407 Dygraph
.findPosX
= function(obj
) {
409 if (obj
.offsetParent
) {
410 while (obj
.offsetParent
) {
411 curleft
+= obj
.offsetLeft
;
412 obj
= obj
.offsetParent
;
420 Dygraph
.findPosY
= function(obj
) {
422 if (obj
.offsetParent
) {
423 while (obj
.offsetParent
) {
424 curtop
+= obj
.offsetTop
;
425 obj
= obj
.offsetParent
;
434 * Create the div that contains information on the selected point(s)
435 * This goes in the top right of the canvas, unless an external div has already
439 Dygraph
.prototype.createStatusMessage_
= function(){
440 if (!this.attr_("labelsDiv")) {
441 var divWidth
= this.attr_('labelsDivWidth');
443 "position": "absolute",
446 "width": divWidth
+ "px",
448 "left": (this.width_
- divWidth
- 2) + "px",
449 "background": "white",
451 "overflow": "hidden"};
452 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
453 var div
= document
.createElement("div");
454 for (var name
in messagestyle
) {
455 if (messagestyle
.hasOwnProperty(name
)) {
456 div
.style
[name
] = messagestyle
[name
];
459 this.graphDiv
.appendChild(div
);
460 this.attrs_
.labelsDiv
= div
;
465 * Create the text box to adjust the averaging period
466 * @return {Object} The newly-created text box
469 Dygraph
.prototype.createRollInterface_
= function() {
470 var display
= this.attr_('showRoller') ? "block" : "none";
471 var textAttr
= { "position": "absolute",
473 "top": (this.plotter_
.area
.h
- 25) + "px",
474 "left": (this.plotter_
.area
.x
+ 1) + "px",
477 var roller
= document
.createElement("input");
478 roller
.type
= "text";
480 roller
.value
= this.rollPeriod_
;
481 for (var name
in textAttr
) {
482 if (textAttr
.hasOwnProperty(name
)) {
483 roller
.style
[name
] = textAttr
[name
];
487 var pa
= this.graphDiv
;
488 pa
.appendChild(roller
);
490 roller
.onchange
= function() { dygraph
.adjustRoll(roller
.value
); };
494 // These functions are taken from MochiKit.Signal
495 Dygraph
.pageX
= function(e
) {
497 return (!e
.pageX
|| e
.pageX
< 0) ? 0 : e
.pageX
;
500 var b
= document
.body
;
502 (de
.scrollLeft
|| b
.scrollLeft
) -
503 (de
.clientLeft
|| 0);
507 Dygraph
.pageY
= function(e
) {
509 return (!e
.pageY
|| e
.pageY
< 0) ? 0 : e
.pageY
;
512 var b
= document
.body
;
514 (de
.scrollTop
|| b
.scrollTop
) -
520 * Set up all the mouse handlers needed to capture dragging behavior for zoom
524 Dygraph
.prototype.createDragInterface_
= function() {
527 // Tracks whether the mouse is down right now
528 var isZooming
= false;
529 var isPanning
= false;
530 var dragStartX
= null;
531 var dragStartY
= null;
535 var draggingDate
= null;
536 var dateRange
= null;
538 // Utility function to convert page-wide coordinates to canvas coords
541 var getX
= function(e
) { return Dygraph
.pageX(e
) - px
};
542 var getY
= function(e
) { return Dygraph
.pageX(e
) - py
};
544 // Draw zoom rectangles when the mouse is down and the user moves around
545 Dygraph
.addEvent(this.hidden_
, 'mousemove', function(event
) {
547 dragEndX
= getX(event
);
548 dragEndY
= getY(event
);
550 self
.drawZoomRect_(dragStartX
, dragEndX
, prevEndX
);
552 } else if (isPanning
) {
553 dragEndX
= getX(event
);
554 dragEndY
= getY(event
);
556 // Want to have it so that:
557 // 1. draggingDate appears at dragEndX
558 // 2. daterange = (dateWindow_[1] - dateWindow_[0]) is unaltered.
560 self
.dateWindow_
[0] = draggingDate
- (dragEndX
/ self
.width_
) * dateRange
;
561 self
.dateWindow_
[1] = self
.dateWindow_
[0] + dateRange
;
562 self
.drawGraph_(self
.rawData_
);
566 // Track the beginning of drag events
567 Dygraph
.addEvent(this.hidden_
, 'mousedown', function(event
) {
568 px
= Dygraph
.findPosX(self
.canvas_
);
569 py
= Dygraph
.findPosY(self
.canvas_
);
570 dragStartX
= getX(event
);
571 dragStartY
= getY(event
);
573 if (event
.altKey
|| event
.shiftKey
) {
574 if (!self
.dateWindow_
) return; // have to be zoomed in to pan.
576 dateRange
= self
.dateWindow_
[1] - self
.dateWindow_
[0];
577 draggingDate
= (dragStartX
/ self
.width_
) * dateRange
+
584 // If the user releases the mouse button during a drag, but not over the
585 // canvas, then it doesn't count as a zooming action.
586 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
587 if (isZooming
|| isPanning
) {
600 // Temporarily cancel the dragging event when the mouse leaves the graph
601 Dygraph
.addEvent(this.hidden_
, 'mouseout', function(event
) {
608 // If the mouse is released on the canvas during a drag event, then it's a
609 // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels)
610 Dygraph
.addEvent(this.hidden_
, 'mouseup', function(event
) {
613 dragEndX
= getX(event
);
614 dragEndY
= getY(event
);
615 var regionWidth
= Math
.abs(dragEndX
- dragStartX
);
616 var regionHeight
= Math
.abs(dragEndY
- dragStartY
);
618 if (regionWidth
< 2 && regionHeight
< 2 &&
619 self
.attr_('clickCallback') != null &&
620 self
.lastx_
!= undefined
) {
621 // TODO(danvk): pass along more info about the points.
622 self
.attr_('clickCallback')(event
, self
.lastx_
, self
.selPoints_
);
625 if (regionWidth
>= 10) {
626 self
.doZoom_(Math
.min(dragStartX
, dragEndX
),
627 Math
.max(dragStartX
, dragEndX
));
629 self
.canvas_
.getContext("2d").clearRect(0, 0,
631 self
.canvas_
.height
);
645 // Double-clicking zooms back out
646 Dygraph
.addEvent(this.hidden_
, 'dblclick', function(event
) {
647 if (self
.dateWindow_
== null) return;
648 self
.dateWindow_
= null;
649 self
.drawGraph_(self
.rawData_
);
650 var minDate
= self
.rawData_
[0][0];
651 var maxDate
= self
.rawData_
[self
.rawData_
.length
- 1][0];
652 if (self
.attr_("zoomCallback")) {
653 self
.attr_("zoomCallback")(minDate
, maxDate
);
659 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
660 * up any previous zoom rectangles that were drawn. This could be optimized to
661 * avoid extra redrawing, but it's tricky to avoid interactions with the status
663 * @param {Number} startX The X position where the drag started, in canvas
665 * @param {Number} endX The current X position of the drag, in canvas coords.
666 * @param {Number} prevEndX The value of endX on the previous call to this
667 * function. Used to avoid excess redrawing
670 Dygraph
.prototype.drawZoomRect_
= function(startX
, endX
, prevEndX
) {
671 var ctx
= this.canvas_
.getContext("2d");
673 // Clean up from the previous rect if necessary
675 ctx
.clearRect(Math
.min(startX
, prevEndX
), 0,
676 Math
.abs(startX
- prevEndX
), this.height_
);
679 // Draw a light-grey rectangle to show the new viewing area
680 if (endX
&& startX
) {
681 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
682 ctx
.fillRect(Math
.min(startX
, endX
), 0,
683 Math
.abs(endX
- startX
), this.height_
);
688 * Zoom to something containing [lowX, highX]. These are pixel coordinates
689 * in the canvas. The exact zoom window may be slightly larger if there are no
690 * data points near lowX or highX. This function redraws the graph.
691 * @param {Number} lowX The leftmost pixel value that should be visible.
692 * @param {Number} highX The rightmost pixel value that should be visible.
695 Dygraph
.prototype.doZoom_
= function(lowX
, highX
) {
696 // Find the earliest and latest dates contained in this canvasx range.
697 var points
= this.layout_
.points
;
700 // Find the nearest [minDate, maxDate] that contains [lowX, highX]
701 for (var i
= 0; i
< points
.length
; i
++) {
702 var cx
= points
[i
].canvasx
;
703 var x
= points
[i
].xval
;
704 if (cx
< lowX
&& (minDate
== null || x
> minDate
)) minDate
= x
;
705 if (cx
> highX
&& (maxDate
== null || x
< maxDate
)) maxDate
= x
;
707 // Use the extremes if either is missing
708 if (minDate
== null) minDate
= points
[0].xval
;
709 if (maxDate
== null) maxDate
= points
[points
.length
-1].xval
;
711 this.dateWindow_
= [minDate
, maxDate
];
712 this.drawGraph_(this.rawData_
);
713 if (this.attr_("zoomCallback")) {
714 this.attr_("zoomCallback")(minDate
, maxDate
);
719 * When the mouse moves in the canvas, display information about a nearby data
720 * point and draw dots over those points in the data series. This function
721 * takes care of cleanup of previously-drawn dots.
722 * @param {Object} event The mousemove event from the browser.
725 Dygraph
.prototype.mouseMove_
= function(event
) {
726 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.hidden_
);
727 var points
= this.layout_
.points
;
732 // Loop through all the points and find the date nearest to our current
734 var minDist
= 1e+100;
736 for (var i
= 0; i
< points
.length
; i
++) {
737 var dist
= Math
.abs(points
[i
].canvasx
- canvasx
);
738 if (dist
> minDist
) break;
742 if (idx
>= 0) lastx
= points
[idx
].xval
;
743 // Check that you can really highlight the last day's data
744 if (canvasx
> points
[points
.length
-1].canvasx
)
745 lastx
= points
[points
.length
-1].xval
;
747 // Extract the points we've selected
748 this.selPoints_
= [];
749 for (var i
= 0; i
< points
.length
; i
++) {
750 if (points
[i
].xval
== lastx
) {
751 this.selPoints_
.push(points
[i
]);
755 if (this.attr_("highlightCallback")) {
756 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
);
759 // Clear the previously drawn vertical, if there is one
760 var circleSize
= this.attr_('highlightCircleSize');
761 var ctx
= this.canvas_
.getContext("2d");
762 if (this.previousVerticalX_
>= 0) {
763 var px
= this.previousVerticalX_
;
764 ctx
.clearRect(px
- circleSize
- 1, 0, 2 * circleSize
+ 2, this.height_
);
767 var isOK
= function(x
) { return x
&& !isNaN(x
); };
769 if (this.selPoints_
.length
> 0) {
770 var canvasx
= this.selPoints_
[0].canvasx
;
772 // Set the status message to indicate the selected point(s)
773 var replace
= this.attr_('xValueFormatter')(lastx
, this) + ":";
774 var clen
= this.colors_
.length
;
775 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
776 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
777 if (this.attr_("labelsSeparateLines")) {
780 var point
= this.selPoints_
[i
];
781 var c
= new RGBColor(this.colors_
[i
%clen
]);
782 replace
+= " <b><font color='" + c
.toHex() + "'>"
783 + point
.name
+ "</font></b>:"
784 + this.round_(point
.yval
, 2);
786 this.attr_("labelsDiv").innerHTML
= replace
;
788 // Save last x position for callbacks.
791 // Draw colored circles over the center of each selected point
793 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
794 if (!isOK(this.selPoints_
[i
%clen
].canvasy
)) continue;
796 ctx
.fillStyle
= this.colors_
[i
%clen
];
797 ctx
.arc(canvasx
, this.selPoints_
[i
%clen
].canvasy
, circleSize
,
798 0, 2 * Math
.PI
, false);
803 this.previousVerticalX_
= canvasx
;
808 * The mouse has left the canvas. Clear out whatever artifacts remain
809 * @param {Object} event the mouseout event from the browser.
812 Dygraph
.prototype.mouseOut_
= function(event
) {
813 // Get rid of the overlay data
814 var ctx
= this.canvas_
.getContext("2d");
815 ctx
.clearRect(0, 0, this.width_
, this.height_
);
816 this.attr_("labelsDiv").innerHTML
= "";
819 Dygraph
.zeropad
= function(x
) {
820 if (x
< 10) return "0" + x
; else return "" + x
;
824 * Return a string version of the hours, minutes and seconds portion of a date.
825 * @param {Number} date The JavaScript date (ms since epoch)
826 * @return {String} A time of the form "HH:MM:SS"
829 Dygraph
.prototype.hmsString_
= function(date
) {
830 var zeropad
= Dygraph
.zeropad
;
831 var d
= new Date(date
);
832 if (d
.getSeconds()) {
833 return zeropad(d
.getHours()) + ":" +
834 zeropad(d
.getMinutes()) + ":" +
835 zeropad(d
.getSeconds());
836 } else if (d
.getMinutes()) {
837 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
839 return zeropad(d
.getHours());
844 * Convert a JS date (millis since epoch) to YYYY/MM/DD
845 * @param {Number} date The JavaScript date (ms since epoch)
846 * @return {String} A date of the form "YYYY/MM/DD"
848 * TODO(danvk): why is this part of the prototype?
850 Dygraph
.dateString_
= function(date
, self
) {
851 var zeropad
= Dygraph
.zeropad
;
852 var d
= new Date(date
);
855 var year
= "" + d
.getFullYear();
856 // Get a 0 padded month string
857 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
858 // Get a 0 padded day string
859 var day
= zeropad(d
.getDate());
862 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
863 if (frac
) ret
= " " + self
.hmsString_(date
);
865 return year
+ "/" + month + "/" + day
+ ret
;
869 * Round a number to the specified number of digits past the decimal point.
870 * @param {Number} num The number to round
871 * @param {Number} places The number of decimals to which to round
872 * @return {Number} The rounded number
875 Dygraph
.prototype.round_
= function(num
, places
) {
876 var shift
= Math
.pow(10, places
);
877 return Math
.round(num
* shift
)/shift
;
881 * Fires when there's data available to be graphed.
882 * @param {String} data Raw CSV data to be plotted
885 Dygraph
.prototype.loadedEvent_
= function(data
) {
886 this.rawData_
= this.parseCSV_(data
);
887 this.drawGraph_(this.rawData_
);
890 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
891 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
892 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
895 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
898 Dygraph
.prototype.addXTicks_
= function() {
899 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
900 var startDate
, endDate
;
901 if (this.dateWindow_
) {
902 startDate
= this.dateWindow_
[0];
903 endDate
= this.dateWindow_
[1];
905 startDate
= this.rawData_
[0][0];
906 endDate
= this.rawData_
[this.rawData_
.length
- 1][0];
909 var xTicks
= this.attr_('xTicker')(startDate
, endDate
, this);
910 this.layout_
.updateOptions({xTicks
: xTicks
});
913 // Time granularity enumeration
914 Dygraph
.SECONDLY
= 0;
915 Dygraph
.TEN_SECONDLY
= 1;
916 Dygraph
.THIRTY_SECONDLY
= 2;
917 Dygraph
.MINUTELY
= 3;
918 Dygraph
.TEN_MINUTELY
= 4;
919 Dygraph
.THIRTY_MINUTELY
= 5;
921 Dygraph
.SIX_HOURLY
= 7;
924 Dygraph
.MONTHLY
= 10;
925 Dygraph
.QUARTERLY
= 11;
926 Dygraph
.BIANNUAL
= 12;
928 Dygraph
.DECADAL
= 14;
929 Dygraph
.NUM_GRANULARITIES
= 15;
931 Dygraph
.SHORT_SPACINGS
= [];
932 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
933 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
934 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
935 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
936 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
937 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
938 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
939 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
940 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
941 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
945 // If we used this time granularity, how many ticks would there be?
946 // This is only an approximation, but it's generally good enough.
948 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
949 if (granularity
< Dygraph
.MONTHLY
) {
950 // Generate one tick mark for every fixed interval of time.
951 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
952 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
954 var year_mod
= 1; // e.g. to only print one point every 10 years.
956 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
957 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
958 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
959 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
961 var msInYear
= 365.2524 * 24 * 3600 * 1000;
962 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
963 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
969 // Construct an x-axis of nicely-formatted times on meaningful boundaries
970 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
972 // Returns an array containing {v: millis, label: label} dictionaries.
974 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
976 if (granularity
< Dygraph
.MONTHLY
) {
977 // Generate one tick mark for every fixed interval of time.
978 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
979 var format
= '%d%b'; // e.g. "1Jan"
981 // Find a time less than start_time which occurs on a "nice" time boundary
982 // for this granularity.
983 var g
= spacing
/ 1000;
985 var d
= new Date(start_time
);
986 if (g
<= 60) { // seconds
987 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
991 if (g
<= 60) { // minutes
992 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
997 if (g
<= 24) { // days
998 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1003 if (g
== 7) { // one week
1009 start_time
= d
.getTime();
1011 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1012 var d
= new Date(t
);
1013 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1014 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1015 // the extra hour covers DST problems.
1016 ticks
.push({ v
:t
, label
: new Date(t
+ 3600*1000).strftime(format
) });
1018 ticks
.push({ v
:t
, label
: this.hmsString_(t
) });
1022 // Display a tick mark on the first of a set of months of each year.
1023 // Years get a tick mark iff y % year_mod == 0. This is useful for
1024 // displaying a tick mark once every 10 years, say, on long time scales.
1026 var year_mod
= 1; // e.g. to only print one point every 10 years.
1028 if (granularity
== Dygraph
.MONTHLY
) {
1029 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1030 } else if (granularity
== Dygraph
.QUARTERLY
) {
1031 months
= [ 0, 3, 6, 9 ];
1032 } else if (granularity
== Dygraph
.BIANNUAL
) {
1034 } else if (granularity
== Dygraph
.ANNUAL
) {
1036 } else if (granularity
== Dygraph
.DECADAL
) {
1041 var start_year
= new Date(start_time
).getFullYear();
1042 var end_year
= new Date(end_time
).getFullYear();
1043 var zeropad
= Dygraph
.zeropad
;
1044 for (var i
= start_year
; i
<= end_year
; i
++) {
1045 if (i
% year_mod
!= 0) continue;
1046 for (var j
= 0; j
< months
.length
; j
++) {
1047 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1048 var t
= Date
.parse(date_str
);
1049 if (t
< start_time
|| t
> end_time
) continue;
1050 ticks
.push({ v
:t
, label
: new Date(t
).strftime('%b %y') });
1060 * Add ticks to the x-axis based on a date range.
1061 * @param {Number} startDate Start of the date window (millis since epoch)
1062 * @param {Number} endDate End of the date window (millis since epoch)
1063 * @return {Array.<Object>} Array of {label, value} tuples.
1066 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1068 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1069 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1070 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1077 return self
.GetXAxis(startDate
, endDate
, chosen
);
1079 // TODO(danvk): signal error.
1084 * Add ticks when the x axis has numbers on it (instead of dates)
1085 * @param {Number} startDate Start of the date window (millis since epoch)
1086 * @param {Number} endDate End of the date window (millis since epoch)
1087 * @return {Array.<Object>} Array of {label, value} tuples.
1090 Dygraph
.numericTicks
= function(minV
, maxV
, self
) {
1092 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1093 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1094 // The first spacing greater than pixelsPerYLabel is what we use.
1095 if (self
.attr_("labelsKMG2")) {
1096 var mults
= [1, 2, 4, 8];
1098 var mults
= [1, 2, 5];
1100 var scale
, low_val
, high_val
, nTicks
;
1101 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1102 var pixelsPerTick
= self
.attr_('pixelsPerYLabel');
1103 for (var i
= -10; i
< 50; i
++) {
1104 if (self
.attr_("labelsKMG2")) {
1105 var base_scale
= Math
.pow(16, i
);
1107 var base_scale
= Math
.pow(10, i
);
1109 for (var j
= 0; j
< mults
.length
; j
++) {
1110 scale
= base_scale
* mults
[j
];
1111 low_val
= Math
.floor(minV
/ scale
) * scale
;
1112 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1113 nTicks
= (high_val
- low_val
) / scale
;
1114 var spacing
= self
.height_
/ nTicks
;
1115 // wish I could break out of both loops at once...
1116 if (spacing
> pixelsPerTick
) break;
1118 if (spacing
> pixelsPerTick
) break;
1121 // Construct labels for the ticks
1125 if (self
.attr_("labelsKMB")) {
1127 k_labels
= [ "K", "M", "B", "T" ];
1129 if (self
.attr_("labelsKMG2")) {
1130 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1132 k_labels
= [ "k", "M", "G", "T" ];
1135 for (var i
= 0; i
< nTicks
; i
++) {
1136 var tickV
= low_val
+ i
* scale
;
1137 var absTickV
= Math
.abs(tickV
);
1138 var label
= self
.round_(tickV
, 2);
1139 if (k_labels
.length
) {
1140 // Round up to an appropriate unit.
1142 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
1143 if (absTickV
>= n
) {
1144 label
= self
.round_(tickV
/ n
, 1) + k_labels
[j
];
1149 ticks
.push( {label
: label
, v
: tickV
} );
1155 * Adds appropriate ticks on the y-axis
1156 * @param {Number} minY The minimum Y value in the data set
1157 * @param {Number} maxY The maximum Y value in the data set
1160 Dygraph
.prototype.addYTicks_
= function(minY
, maxY
) {
1161 // Set the number of ticks so that the labels are human-friendly.
1162 // TODO(danvk): make this an attribute as well.
1163 var ticks
= Dygraph
.numericTicks(minY
, maxY
, this);
1164 this.layout_
.updateOptions( { yAxis
: [minY
, maxY
],
1168 // Computes the range of the data series (including confidence intervals).
1169 // series is either [ [x1, y1], [x2, y2], ... ] or
1170 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1171 // Returns [low, high]
1172 Dygraph
.prototype.extremeValues_
= function(series
) {
1173 var minY
= null, maxY
= null;
1175 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1177 // With custom bars, maxY is the max of the high values.
1178 for (var j
= 0; j
< series
.length
; j
++) {
1179 var y
= series
[j
][1][0];
1181 var low
= y
- series
[j
][1][1];
1182 var high
= y
+ series
[j
][1][2];
1183 if (low
> y
) low
= y
; // this can happen with custom bars,
1184 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1185 if (maxY
== null || high
> maxY
) {
1188 if (minY
== null || low
< minY
) {
1193 for (var j
= 0; j
< series
.length
; j
++) {
1194 var y
= series
[j
][1];
1195 if (y
=== null || isNaN(y
)) continue;
1196 if (maxY
== null || y
> maxY
) {
1199 if (minY
== null || y
< minY
) {
1205 return [minY
, maxY
];
1209 * Update the graph with new data. Data is in the format
1210 * [ [date1, val1, val2, ...], [date2, val1, val2, ...] if errorBars=false
1211 * or, if errorBars=true,
1212 * [ [date1, [val1,stddev1], [val2,stddev2], ...], [date2, ...], ...]
1213 * @param {Array.<Object>} data The data (see above)
1216 Dygraph
.prototype.drawGraph_
= function(data
) {
1217 var minY
= null, maxY
= null;
1218 this.layout_
.removeAllDatasets();
1220 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
1222 // Loop over all fields in the dataset
1223 for (var i
= 1; i
< data
[0].length
; i
++) {
1225 for (var j
= 0; j
< data
.length
; j
++) {
1226 var date
= data
[j
][0];
1227 series
[j
] = [date
, data
[j
][i
]];
1229 series
= this.rollingAverage(series
, this.rollPeriod_
);
1231 // Prune down to the desired range, if necessary (for zooming)
1232 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1233 if (this.dateWindow_
) {
1234 var low
= this.dateWindow_
[0];
1235 var high
= this.dateWindow_
[1];
1237 for (var k
= 0; k
< series
.length
; k
++) {
1238 if (series
[k
][0] >= low
&& series
[k
][0] <= high
) {
1239 pruned
.push(series
[k
]);
1245 var extremes
= this.extremeValues_(series
);
1246 var thisMinY
= extremes
[0];
1247 var thisMaxY
= extremes
[1];
1248 if (!minY
|| thisMinY
< minY
) minY
= thisMinY
;
1249 if (!maxY
|| thisMaxY
> maxY
) maxY
= thisMaxY
;
1253 for (var j
=0; j
<series
.length
; j
++)
1254 vals
[j
] = [series
[j
][0],
1255 series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
1256 this.layout_
.addDataset(this.attr_("labels")[i
], vals
);
1258 this.layout_
.addDataset(this.attr_("labels")[i
], series
);
1262 // Use some heuristics to come up with a good maxY value, unless it's been
1263 // set explicitly by the user.
1264 if (this.valueRange_
!= null) {
1265 this.addYTicks_(this.valueRange_
[0], this.valueRange_
[1]);
1267 // Add some padding and round up to an integer to be human-friendly.
1268 var span
= maxY
- minY
;
1269 var maxAxisY
= maxY
+ 0.1 * span
;
1270 var minAxisY
= minY
- 0.1 * span
;
1272 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
1273 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
1274 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
1276 if (this.attr_("includeZero")) {
1277 if (maxY
< 0) maxAxisY
= 0;
1278 if (minY
> 0) minAxisY
= 0;
1281 this.addYTicks_(minAxisY
, maxAxisY
);
1286 // Tell PlotKit to use this new data and render itself
1287 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
1288 this.layout_
.evaluateWithError();
1289 this.plotter_
.clear();
1290 this.plotter_
.render();
1291 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
1292 this.canvas_
.height
);
1296 * Calculates the rolling average of a data set.
1297 * If originalData is [label, val], rolls the average of those.
1298 * If originalData is [label, [, it's interpreted as [value, stddev]
1299 * and the roll is returned in the same form, with appropriately reduced
1300 * stddev for each value.
1301 * Note that this is where fractional input (i.e. '5/10') is converted into
1303 * @param {Array} originalData The data in the appropriate format (see above)
1304 * @param {Number} rollPeriod The number of days over which to average the data
1306 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
1307 if (originalData
.length
< 2)
1308 return originalData
;
1309 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
1310 var rollingData
= [];
1311 var sigma
= this.attr_("sigma");
1313 if (this.fractions_
) {
1315 var den
= 0; // numerator/denominator
1317 for (var i
= 0; i
< originalData
.length
; i
++) {
1318 num
+= originalData
[i
][1][0];
1319 den
+= originalData
[i
][1][1];
1320 if (i
- rollPeriod
>= 0) {
1321 num
-= originalData
[i
- rollPeriod
][1][0];
1322 den
-= originalData
[i
- rollPeriod
][1][1];
1325 var date
= originalData
[i
][0];
1326 var value
= den
? num
/ den
: 0.0;
1327 if (this.attr_("errorBars")) {
1328 if (this.wilsonInterval_
) {
1329 // For more details on this confidence interval, see:
1330 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
1332 var p
= value
< 0 ? 0 : value
, n
= den
;
1333 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
1334 var denom
= 1 + sigma
* sigma
/ den
;
1335 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
1336 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
1337 rollingData
[i
] = [date
,
1338 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
1340 rollingData
[i
] = [date
, [0, 0, 0]];
1343 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
1344 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
1347 rollingData
[i
] = [date
, mult
* value
];
1350 } else if (this.attr_("customBars")) {
1355 for (var i
= 0; i
< originalData
.length
; i
++) {
1356 var data
= originalData
[i
][1];
1358 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
1360 if (y
!= null && !isNaN(y
)) {
1366 if (i
- rollPeriod
>= 0) {
1367 var prev
= originalData
[i
- rollPeriod
];
1368 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
1375 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
1376 1.0 * (mid
- low
) / count
,
1377 1.0 * (high
- mid
) / count
]];
1380 // Calculate the rolling average for the first rollPeriod - 1 points where
1381 // there is not enough data to roll over the full number of days
1382 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
1383 if (!this.attr_("errorBars")){
1384 if (rollPeriod
== 1) {
1385 return originalData
;
1388 for (var i
= 0; i
< originalData
.length
; i
++) {
1391 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
1392 var y
= originalData
[j
][1];
1393 if (y
== null || isNaN(y
)) continue;
1395 sum
+= originalData
[j
][1];
1398 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
1400 rollingData
[i
] = [originalData
[i
][0], null];
1405 for (var i
= 0; i
< originalData
.length
; i
++) {
1409 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
1410 var y
= originalData
[j
][1][0];
1411 if (y
== null || isNaN(y
)) continue;
1413 sum
+= originalData
[j
][1][0];
1414 variance
+= Math
.pow(originalData
[j
][1][1], 2);
1417 var stddev
= Math
.sqrt(variance
) / num_ok
;
1418 rollingData
[i
] = [originalData
[i
][0],
1419 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
1421 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
1431 * Parses a date, returning the number of milliseconds since epoch. This can be
1432 * passed in as an xValueParser in the Dygraph constructor.
1433 * TODO(danvk): enumerate formats that this understands.
1434 * @param {String} A date in YYYYMMDD format.
1435 * @return {Number} Milliseconds since epoch.
1438 Dygraph
.dateParser
= function(dateStr
, self
) {
1441 if (dateStr
.length
== 10 && dateStr
.search("-") != -1) { // e.g. '2009-07-12'
1442 dateStrSlashed
= dateStr
.replace("-", "/", "g");
1443 while (dateStrSlashed
.search("-") != -1) {
1444 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
1446 d
= Date
.parse(dateStrSlashed
);
1447 } else if (dateStr
.length
== 8) { // e.g. '20090712'
1448 // TODO(danvk): remove support for this format. It's confusing.
1449 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
1450 + "/" + dateStr
.substr(6,2);
1451 d
= Date
.parse(dateStrSlashed
);
1453 // Any format that Date.parse will accept, e.g. "2009/07/12" or
1454 // "2009/07/12 12:34:56"
1455 d
= Date
.parse(dateStr
);
1458 if (!d
|| isNaN(d
)) {
1459 self
.error("Couldn't parse " + dateStr
+ " as a date");
1465 * Detects the type of the str (date or numeric) and sets the various
1466 * formatting attributes in this.attrs_ based on this type.
1467 * @param {String} str An x value.
1470 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
1472 if (str
.indexOf('-') >= 0 ||
1473 str
.indexOf('/') >= 0 ||
1474 isNaN(parseFloat(str
))) {
1476 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
1477 // TODO(danvk): remove support for this format.
1482 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
1483 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
1484 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
1486 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
1487 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
1488 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
1493 * Parses a string in a special csv format. We expect a csv file where each
1494 * line is a date point, and the first field in each line is the date string.
1495 * We also expect that all remaining fields represent series.
1496 * if the errorBars attribute is set, then interpret the fields as:
1497 * date, series1, stddev1, series2, stddev2, ...
1498 * @param {Array.<Object>} data See above.
1501 * @return Array.<Object> An array with one entry for each row. These entries
1502 * are an array of cells in that row. The first entry is the parsed x-value for
1503 * the row. The second, third, etc. are the y-values. These can take on one of
1504 * three forms, depending on the CSV and constructor parameters:
1506 * 2. [ value, stddev ]
1507 * 3. [ low value, center value, high value ]
1509 Dygraph
.prototype.parseCSV_
= function(data
) {
1511 var lines
= data
.split("\n");
1513 // Use the default delimiter or fall back to a tab if that makes sense.
1514 var delim
= this.attr_('delimiter');
1515 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
1520 if (this.labelsFromCSV_
) {
1522 this.attrs_
.labels
= lines
[0].split(delim
);
1526 var defaultParserSet
= false; // attempt to auto-detect x value type
1527 var expectedCols
= this.attr_("labels").length
;
1528 for (var i
= start
; i
< lines
.length
; i
++) {
1529 var line
= lines
[i
];
1530 if (line
.length
== 0) continue; // skip blank lines
1531 if (line
[0] == '#') continue; // skip comment lines
1532 var inFields
= line
.split(delim
);
1533 if (inFields
.length
< 2) continue;
1536 if (!defaultParserSet
) {
1537 this.detectTypeFromString_(inFields
[0]);
1538 xParser
= this.attr_("xValueParser");
1539 defaultParserSet
= true;
1541 fields
[0] = xParser(inFields
[0], this);
1543 // If fractions are expected, parse the numbers as "A/B
"
1544 if (this.fractions_) {
1545 for (var j = 1; j < inFields.length; j++) {
1546 // TODO(danvk): figure out an appropriate way to flag parse errors.
1547 var vals = inFields[j].split("/");
1548 fields[j] = [parseFloat(vals[0]), parseFloat(vals[1])];
1550 } else if (this.attr_("errorBars
")) {
1551 // If there are error bars, values are (value, stddev) pairs
1552 for (var j = 1; j < inFields.length; j += 2)
1553 fields[(j + 1) / 2] = [parseFloat(inFields[j]),
1554 parseFloat(inFields[j + 1])];
1555 } else if (this.attr_("customBars
")) {
1556 // Bars are a low;center;high tuple
1557 for (var j = 1; j < inFields.length; j++) {
1558 var vals = inFields[j].split(";");
1559 fields[j] = [ parseFloat(vals[0]),
1560 parseFloat(vals[1]),
1561 parseFloat(vals[2]) ];
1564 // Values are just numbers
1565 for (var j = 1; j < inFields.length; j++) {
1566 fields[j] = parseFloat(inFields[j]);
1571 if (fields.length != expectedCols) {
1572 this.error("Number of columns
in line
" + i + " (" + fields.length +
1573 ") does not agree
with number of
labels (" + expectedCols +
1581 * The user has provided their data as a pre-packaged JS array. If the x values
1582 * are numeric, this is the same as dygraphs' internal format. If the x values
1583 * are dates, we need to convert them from Date objects to ms since epoch.
1584 * @param {Array.<Object>} data
1585 * @return {Array.<Object>} data with numeric x values.
1587 Dygraph.prototype.parseArray_ = function(data) {
1588 // Peek at the first x value to see if it's numeric.
1589 if (data.length == 0) {
1590 this.error("Can
't plot empty data set");
1593 if (data[0].length == 0) {
1594 this.error("Data set cannot contain an empty row");
1598 if (this.attr_("labels") == null) {
1599 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
1600 "in the options parameter");
1601 this.attrs_.labels = [ "X" ];
1602 for (var i = 1; i < data[0].length; i++) {
1603 this.attrs_.labels.push("Y" + i);
1607 if (Dygraph.isDateLike(data[0][0])) {
1608 // Some intelligent defaults for a date x-axis.
1609 this.attrs_.xValueFormatter = Dygraph.dateString_;
1610 this.attrs_.xTicker = Dygraph.dateTicker;
1612 // Assume they're all dates
.
1613 var parsedData
= Dygraph
.clone(data
);
1614 for (var i
= 0; i
< data
.length
; i
++) {
1615 if (parsedData
[i
].length
== 0) {
1616 this.error("Row " << (1 + i
) << " of data is empty");
1619 if (parsedData
[i
][0] == null
1620 || typeof(parsedData
[i
][0].getTime
) != 'function') {
1621 this.error("x value in row " << (1 + i
) << " is not a Date");
1624 parsedData
[i
][0] = parsedData
[i
][0].getTime();
1628 // Some intelligent defaults for a numeric x-axis.
1629 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
1630 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
1636 * Parses a DataTable object from gviz.
1637 * The data is expected to have a first column that is either a date or a
1638 * number. All subsequent columns must be numbers. If there is a clear mismatch
1639 * between this.xValueParser_ and the type of the first column, it will be
1640 * fixed. Returned value is in the same format as return value of parseCSV_.
1641 * @param {Array.<Object>} data See above.
1644 Dygraph
.prototype.parseDataTable_
= function(data
) {
1645 var cols
= data
.getNumberOfColumns();
1646 var rows
= data
.getNumberOfRows();
1648 // Read column labels
1650 for (var i
= 0; i
< cols
; i
++) {
1651 labels
.push(data
.getColumnLabel(i
));
1652 if (i
!= 0 && this.attr_("errorBars")) i
+= 1;
1654 this.attrs_
.labels
= labels
;
1655 cols
= labels
.length
;
1657 var indepType
= data
.getColumnType(0);
1658 if (indepType
== 'date') {
1659 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
1660 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
1661 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
1662 } else if (indepType
== 'number') {
1663 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
1664 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
1665 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
1667 this.error("only 'date' and 'number' types are supported for column 1 " +
1668 "of DataTable input (Got '" + indepType
+ "')");
1673 for (var i
= 0; i
< rows
; i
++) {
1675 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
1676 data
.getValue(i
, 0) === null) {
1677 this.warning("Ignoring row " + i
+
1678 " of DataTable because of undefined or null first column.");
1682 if (indepType
== 'date') {
1683 row
.push(data
.getValue(i
, 0).getTime());
1685 row
.push(data
.getValue(i
, 0));
1687 if (!this.attr_("errorBars")) {
1688 for (var j
= 1; j
< cols
; j
++) {
1689 row
.push(data
.getValue(i
, j
));
1692 for (var j
= 0; j
< cols
- 1; j
++) {
1693 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
1701 // These functions are all based on MochiKit.
1702 Dygraph
.update
= function (self
, o
) {
1703 if (typeof(o
) != 'undefined' && o
!== null) {
1705 if (o
.hasOwnProperty(k
)) {
1713 Dygraph
.isArrayLike
= function (o
) {
1714 var typ
= typeof(o
);
1716 (typ
!= 'object' && !(typ
== 'function' &&
1717 typeof(o
.item
) == 'function')) ||
1719 typeof(o
.length
) != 'number' ||
1727 Dygraph
.isDateLike
= function (o
) {
1728 if (typeof(o
) != "object" || o
=== null ||
1729 typeof(o
.getTime
) != 'function') {
1735 Dygraph
.clone
= function(o
) {
1736 // TODO(danvk): figure out how MochiKit's version works
1738 for (var i
= 0; i
< o
.length
; i
++) {
1739 if (Dygraph
.isArrayLike(o
[i
])) {
1740 r
.push(Dygraph
.clone(o
[i
]));
1750 * Get the CSV data. If it's in a function, call that function. If it's in a
1751 * file, do an XMLHttpRequest to get it.
1754 Dygraph
.prototype.start_
= function() {
1755 if (typeof this.file_
== 'function') {
1756 // CSV string. Pretend we got it via XHR.
1757 this.loadedEvent_(this.file_());
1758 } else if (Dygraph
.isArrayLike(this.file_
)) {
1759 this.rawData_
= this.parseArray_(this.file_
);
1760 this.drawGraph_(this.rawData_
);
1761 } else if (typeof this.file_
== 'object' &&
1762 typeof this.file_
.getColumnRange
== 'function') {
1763 // must be a DataTable from gviz.
1764 this.rawData_
= this.parseDataTable_(this.file_
);
1765 this.drawGraph_(this.rawData_
);
1766 } else if (typeof this.file_
== 'string') {
1767 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
1768 if (this.file_
.indexOf('\n') >= 0) {
1769 this.loadedEvent_(this.file_
);
1771 var req
= new XMLHttpRequest();
1773 req
.onreadystatechange
= function () {
1774 if (req
.readyState
== 4) {
1775 if (req
.status
== 200) {
1776 caller
.loadedEvent_(req
.responseText
);
1781 req
.open("GET", this.file_
, true);
1785 this.error("Unknown data format: " + (typeof this.file_
));
1790 * Changes various properties of the graph. These can include:
1792 * <li>file: changes the source data for the graph</li>
1793 * <li>errorBars: changes whether the data contains stddev</li>
1795 * @param {Object} attrs The new properties and values
1797 Dygraph
.prototype.updateOptions
= function(attrs
) {
1798 // TODO(danvk): this is a mess. Rethink this function.
1799 if (attrs
.rollPeriod
) {
1800 this.rollPeriod_
= attrs
.rollPeriod
;
1802 if (attrs
.dateWindow
) {
1803 this.dateWindow_
= attrs
.dateWindow
;
1805 if (attrs
.valueRange
) {
1806 this.valueRange_
= attrs
.valueRange
;
1808 Dygraph
.update(this.user_attrs_
, attrs
);
1810 this.labelsFromCSV_
= (this.attr_("labels") == null);
1812 // TODO(danvk): this doesn't match the constructor logic
1813 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
1814 if (attrs
['file'] && attrs
['file'] != this.file_
) {
1815 this.file_
= attrs
['file'];
1818 this.drawGraph_(this.rawData_
);
1823 * Resizes the dygraph. If no parameters are specified, resizes to fill the
1824 * containing div (which has presumably changed size since the dygraph was
1825 * instantiated. If the width/height are specified, the div will be resized.
1827 * This is far more efficient than destroying and re-instantiating a
1828 * Dygraph, since it doesn't have to reparse the underlying data.
1830 * @param {Number} width Width (in pixels)
1831 * @param {Number} height Height (in pixels)
1833 Dygraph
.prototype.resize
= function(width
, height
) {
1834 if ((width
=== null) != (height
=== null)) {
1835 this.warn("Dygraph.resize() should be called with zero parameters or " +
1836 "two non-NULL parameters. Pretending it was zero.");
1837 width
= height
= null;
1840 // TODO(danvk): there should be a clear() method.
1841 this.maindiv_
.innerHTML
= "";
1842 this.attrs_
.labelsDiv
= null;
1845 this.maindiv_
.style
.width
= width
+ "px";
1846 this.maindiv_
.style
.height
= height
+ "px";
1847 this.width_
= width
;
1848 this.height_
= height
;
1850 this.width_
= this.maindiv_
.offsetWidth
;
1851 this.height_
= this.maindiv_
.offsetHeight
;
1854 this.createInterface_();
1855 this.drawGraph_(this.rawData_
);
1859 * Adjusts the number of days in the rolling average. Updates the graph to
1860 * reflect the new averaging period.
1861 * @param {Number} length Number of days over which to average the data.
1863 Dygraph
.prototype.adjustRoll
= function(length
) {
1864 this.rollPeriod_
= length
;
1865 this.drawGraph_(this.rawData_
);
1869 * Create a new canvas element. This is more complex than a simple
1870 * document.createElement("canvas") because of IE and excanvas.
1872 Dygraph
.createCanvas
= function() {
1873 var canvas
= document
.createElement("canvas");
1875 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
1877 canvas
= G_vmlCanvasManager
.initElement(canvas
);
1885 * A wrapper around Dygraph that implements the gviz API.
1886 * @param {Object} container The DOM object the visualization should live in.
1888 Dygraph
.GVizChart
= function(container
) {
1889 this.container
= container
;
1892 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
1893 this.container
.innerHTML
= '';
1894 this.date_graph
= new Dygraph(this.container
, data
, options
);
1897 // Older pages may still use this name.
1898 DateGraph
= Dygraph
;