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,
97 yValueFormatter
: null,
102 axisLabelFontSize
: 14,
108 xValueFormatter
: Dygraph
.dateString_
,
109 xValueParser
: Dygraph
.dateParser
,
110 xTicker
: Dygraph
.dateTicker
,
118 wilsonInterval
: true, // only relevant if fractions is true
124 hideOverlayOnMouseOut
: true
127 // Various logging levels.
133 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
134 // Labels is no longer a constructor parameter, since it's typically set
135 // directly from the data source. It also conains a name for the x-axis,
136 // which the previous constructor form did not.
137 if (labels
!= null) {
138 var new_labels
= ["Date"];
139 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
140 Dygraph
.update(attrs
, { 'labels': new_labels
});
142 this.__init__(div
, file
, attrs
);
146 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
147 * and interaction <canvas> inside of it. See the constructor for details
149 * @param {Element} div the Element to render the graph into.
150 * @param {String | Function} file Source data
151 * @param {Object} attrs Miscellaneous other options
154 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
155 // Support two-argument constructor
156 if (attrs
== null) { attrs
= {}; }
158 // Copy the important bits into the object
159 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
162 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
163 this.previousVerticalX_
= -1;
164 this.fractions_
= attrs
.fractions
|| false;
165 this.dateWindow_
= attrs
.dateWindow
|| null;
166 this.valueRange_
= attrs
.valueRange
|| null;
167 this.wilsonInterval_
= attrs
.wilsonInterval
|| true;
169 // Clear the div. This ensure that, if multiple dygraphs are passed the same
170 // div, then only one will be drawn.
173 // If the div isn't already sized then inherit from our attrs or
174 // give it a default size.
175 if (div
.style
.width
== '') {
176 div
.style
.width
= attrs
.width
|| Dygraph
.DEFAULT_WIDTH
+ "px";
178 if (div
.style
.height
== '') {
179 div
.style
.height
= attrs
.height
|| Dygraph
.DEFAULT_HEIGHT
+ "px";
181 this.width_
= parseInt(div
.style
.width
, 10);
182 this.height_
= parseInt(div
.style
.height
, 10);
183 // The div might have been specified as percent of the current window size,
184 // convert that to an appropriate number of pixels.
185 if (div
.style
.width
.indexOf("%") == div
.style
.width
.length
- 1) {
186 // Minus ten pixels keeps scrollbars from showing up for a 100% width div.
187 this.width_
= (this.width_
* self
.innerWidth
/ 100) - 10;
189 if (div
.style
.height
.indexOf("%") == div
.style
.height
.length
- 1) {
190 this.height_
= (this.height_
* self
.innerHeight
/ 100) - 10;
193 if (attrs
['stackedGraph']) {
194 attrs
['fillGraph'] = true;
195 // TODO(nikhilk): Add any other stackedGraph checks here.
198 // Dygraphs has many options, some of which interact with one another.
199 // To keep track of everything, we maintain two sets of options:
201 // this.user_attrs_ only options explicitly set by the user.
202 // this.attrs_ defaults, options derived from user_attrs_, data.
204 // Options are then accessed this.attr_('attr'), which first looks at
205 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
206 // defaults without overriding behavior that the user specifically asks for.
207 this.user_attrs_
= {};
208 Dygraph
.update(this.user_attrs_
, attrs
);
211 Dygraph
.update(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
213 // Make a note of whether labels will be pulled from the CSV file.
214 this.labelsFromCSV_
= (this.attr_("labels") == null);
216 // Create the containing DIV and other interactive elements
217 this.createInterface_();
222 Dygraph
.prototype.attr_
= function(name
) {
223 if (typeof(this.user_attrs_
[name
]) != 'undefined') {
224 return this.user_attrs_
[name
];
225 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
226 return this.attrs_
[name
];
232 // TODO(danvk): any way I can get the line numbers to be this.warn call?
233 Dygraph
.prototype.log
= function(severity
, message
) {
234 if (typeof(console
) != 'undefined') {
237 console
.debug('dygraphs: ' + message
);
240 console
.info('dygraphs: ' + message
);
242 case Dygraph
.WARNING
:
243 console
.warn('dygraphs: ' + message
);
246 console
.error('dygraphs: ' + message
);
251 Dygraph
.prototype.info
= function(message
) {
252 this.log(Dygraph
.INFO
, message
);
254 Dygraph
.prototype.warn
= function(message
) {
255 this.log(Dygraph
.WARNING
, message
);
257 Dygraph
.prototype.error
= function(message
) {
258 this.log(Dygraph
.ERROR
, message
);
262 * Returns the current rolling period, as set by the user or an option.
263 * @return {Number} The number of days in the rolling window
265 Dygraph
.prototype.rollPeriod
= function() {
266 return this.rollPeriod_
;
269 Dygraph
.addEvent
= function(el
, evt
, fn
) {
270 var normed_fn
= function(e
) {
271 if (!e
) var e
= window
.event
;
274 if (window
.addEventListener
) { // Mozilla, Netscape, Firefox
275 el
.addEventListener(evt
, normed_fn
, false);
277 el
.attachEvent('on' + evt
, normed_fn
);
282 * Generates interface elements for the Dygraph: a containing div, a div to
283 * display the current point, and a textbox to adjust the rolling average
284 * period. Also creates the Renderer/Layout elements.
287 Dygraph
.prototype.createInterface_
= function() {
288 // Create the all-enclosing graph div
289 var enclosing
= this.maindiv_
;
291 this.graphDiv
= document
.createElement("div");
292 this.graphDiv
.style
.width
= this.width_
+ "px";
293 this.graphDiv
.style
.height
= this.height_
+ "px";
294 enclosing
.appendChild(this.graphDiv
);
296 // Create the canvas for interactive parts of the chart.
297 // this.canvas_ = document.createElement("canvas");
298 this.canvas_
= Dygraph
.createCanvas();
299 this.canvas_
.style
.position
= "absolute";
300 this.canvas_
.width
= this.width_
;
301 this.canvas_
.height
= this.height_
;
302 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
303 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
304 this.graphDiv
.appendChild(this.canvas_
);
306 // ... and for static parts of the chart.
307 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
310 Dygraph
.addEvent(this.hidden_
, 'mousemove', function(e
) {
311 dygraph
.mouseMove_(e
);
313 Dygraph
.addEvent(this.hidden_
, 'mouseout', function(e
) {
314 dygraph
.mouseOut_(e
);
317 // Create the grapher
318 // TODO(danvk): why does the Layout need its own set of options?
319 this.layoutOptions_
= { 'xOriginIsZero': false };
320 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
321 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
322 Dygraph
.update(this.layoutOptions_
, {
323 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) });
325 this.layout_
= new DygraphLayout(this, this.layoutOptions_
);
327 // TODO(danvk): why does the Renderer need its own set of options?
328 this.renderOptions_
= { colorScheme
: this.colors_
,
330 axisLineWidth
: Dygraph
.AXIS_LINE_WIDTH
};
331 Dygraph
.update(this.renderOptions_
, this.attrs_
);
332 Dygraph
.update(this.renderOptions_
, this.user_attrs_
);
333 this.plotter_
= new DygraphCanvasRenderer(this,
334 this.hidden_
, this.layout_
,
335 this.renderOptions_
);
337 this.createStatusMessage_();
338 this.createRollInterface_();
339 this.createDragInterface_();
343 * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on
344 * this particular canvas. All Dygraph work is done on this.canvas_.
345 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
346 * @return {Object} The newly-created canvas
349 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
350 // var h = document.createElement("canvas");
351 var h
= Dygraph
.createCanvas();
352 h
.style
.position
= "absolute";
353 h
.style
.top
= canvas
.style
.top
;
354 h
.style
.left
= canvas
.style
.left
;
355 h
.width
= this.width_
;
356 h
.height
= this.height_
;
357 h
.style
.width
= this.width_
+ "px"; // for IE
358 h
.style
.height
= this.height_
+ "px"; // for IE
359 this.graphDiv
.appendChild(h
);
363 // Taken from MochiKit.Color
364 Dygraph
.hsvToRGB
= function (hue
, saturation
, value
) {
368 if (saturation
=== 0) {
373 var i
= Math
.floor(hue
* 6);
374 var f
= (hue
* 6) - i
;
375 var p
= value
* (1 - saturation
);
376 var q
= value
* (1 - (saturation
* f
));
377 var t
= value
* (1 - (saturation
* (1 - f
)));
379 case 1: red
= q
; green
= value
; blue
= p
; break;
380 case 2: red
= p
; green
= value
; blue
= t
; break;
381 case 3: red
= p
; green
= q
; blue
= value
; break;
382 case 4: red
= t
; green
= p
; blue
= value
; break;
383 case 5: red
= value
; green
= p
; blue
= q
; break;
384 case 6: // fall through
385 case 0: red
= value
; green
= t
; blue
= p
; break;
388 red
= Math
.floor(255 * red
+ 0.5);
389 green
= Math
.floor(255 * green
+ 0.5);
390 blue
= Math
.floor(255 * blue
+ 0.5);
391 return 'rgb(' + red
+ ',' + green
+ ',' + blue
+ ')';
396 * Generate a set of distinct colors for the data series. This is done with a
397 * color wheel. Saturation/Value are customizable, and the hue is
398 * equally-spaced around the color wheel. If a custom set of colors is
399 * specified, that is used instead.
402 Dygraph
.prototype.setColors_
= function() {
403 // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do
404 // away with this.renderOptions_.
405 var num
= this.attr_("labels").length
- 1;
407 var colors
= this.attr_('colors');
409 var sat
= this.attr_('colorSaturation') || 1.0;
410 var val
= this.attr_('colorValue') || 0.5;
411 for (var i
= 1; i
<= num
; i
++) {
412 if (!this.visibility()[i
-1]) continue;
413 // alternate colors for high contrast.
414 var idx
= i
- parseInt(i
% 2 ? i
/ 2 : (i - num)/2, 10);
415 var hue
= (1.0 * idx
/ (1 + num
));
416 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
419 for (var i
= 0; i
< num
; i
++) {
420 if (!this.visibility()[i
]) continue;
421 var colorStr
= colors
[i
% colors
.length
];
422 this.colors_
.push(colorStr
);
426 // TODO(danvk): update this w/r
/t/ the
new options system
.
427 this.renderOptions_
.colorScheme
= this.colors_
;
428 Dygraph
.update(this.plotter_
.options
, this.renderOptions_
);
429 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
430 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
434 * Return the list of colors. This is either the list of colors passed in the
435 * attributes, or the autogenerated list of rgb(r,g,b) strings.
436 * @return {Array<string>} The list of colors.
438 Dygraph
.prototype.getColors
= function() {
442 // The following functions are from quirksmode.org
443 // http://www.quirksmode.org/js
/findpos
.html
444 Dygraph
.findPosX
= function(obj
) {
446 if (obj
.offsetParent
) {
447 while (obj
.offsetParent
) {
448 curleft
+= obj
.offsetLeft
;
449 obj
= obj
.offsetParent
;
457 Dygraph
.findPosY
= function(obj
) {
459 if (obj
.offsetParent
) {
460 while (obj
.offsetParent
) {
461 curtop
+= obj
.offsetTop
;
462 obj
= obj
.offsetParent
;
471 * Create the div that contains information on the selected point(s)
472 * This goes in the top right of the canvas, unless an external div has already
476 Dygraph
.prototype.createStatusMessage_
= function(){
477 if (!this.attr_("labelsDiv")) {
478 var divWidth
= this.attr_('labelsDivWidth');
480 "position": "absolute",
483 "width": divWidth
+ "px",
485 "left": (this.width_
- divWidth
- 2) + "px",
486 "background": "white",
488 "overflow": "hidden"};
489 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
490 var div
= document
.createElement("div");
491 for (var name
in messagestyle
) {
492 if (messagestyle
.hasOwnProperty(name
)) {
493 div
.style
[name
] = messagestyle
[name
];
496 this.graphDiv
.appendChild(div
);
497 this.attrs_
.labelsDiv
= div
;
502 * Create the text box to adjust the averaging period
503 * @return {Object} The newly-created text box
506 Dygraph
.prototype.createRollInterface_
= function() {
507 var display
= this.attr_('showRoller') ? "block" : "none";
508 var textAttr
= { "position": "absolute",
510 "top": (this.plotter_
.area
.h
- 25) + "px",
511 "left": (this.plotter_
.area
.x
+ 1) + "px",
514 var roller
= document
.createElement("input");
515 roller
.type
= "text";
517 roller
.value
= this.rollPeriod_
;
518 for (var name
in textAttr
) {
519 if (textAttr
.hasOwnProperty(name
)) {
520 roller
.style
[name
] = textAttr
[name
];
524 var pa
= this.graphDiv
;
525 pa
.appendChild(roller
);
527 roller
.onchange
= function() { dygraph
.adjustRoll(roller
.value
); };
531 // These functions are taken from MochiKit.Signal
532 Dygraph
.pageX
= function(e
) {
534 return (!e
.pageX
|| e
.pageX
< 0) ? 0 : e
.pageX
;
537 var b
= document
.body
;
539 (de
.scrollLeft
|| b
.scrollLeft
) -
540 (de
.clientLeft
|| 0);
544 Dygraph
.pageY
= function(e
) {
546 return (!e
.pageY
|| e
.pageY
< 0) ? 0 : e
.pageY
;
549 var b
= document
.body
;
551 (de
.scrollTop
|| b
.scrollTop
) -
557 * Set up all the mouse handlers needed to capture dragging behavior for zoom
561 Dygraph
.prototype.createDragInterface_
= function() {
564 // Tracks whether the mouse is down right now
565 var isZooming
= false;
566 var isPanning
= false;
567 var dragStartX
= null;
568 var dragStartY
= null;
572 var draggingDate
= null;
573 var dateRange
= null;
575 // Utility function to convert page-wide coordinates to canvas coords
578 var getX
= function(e
) { return Dygraph
.pageX(e
) - px
};
579 var getY
= function(e
) { return Dygraph
.pageX(e
) - py
};
581 // Draw zoom rectangles when the mouse is down and the user moves around
582 Dygraph
.addEvent(this.hidden_
, 'mousemove', function(event
) {
584 dragEndX
= getX(event
);
585 dragEndY
= getY(event
);
587 self
.drawZoomRect_(dragStartX
, dragEndX
, prevEndX
);
589 } else if (isPanning
) {
590 dragEndX
= getX(event
);
591 dragEndY
= getY(event
);
593 // Want to have it so that:
594 // 1. draggingDate appears at dragEndX
595 // 2. daterange = (dateWindow_[1] - dateWindow_[0]) is unaltered.
597 self
.dateWindow_
[0] = draggingDate
- (dragEndX
/ self
.width_
) * dateRange
;
598 self
.dateWindow_
[1] = self
.dateWindow_
[0] + dateRange
;
599 self
.drawGraph_(self
.rawData_
);
603 // Track the beginning of drag events
604 Dygraph
.addEvent(this.hidden_
, 'mousedown', function(event
) {
605 px
= Dygraph
.findPosX(self
.canvas_
);
606 py
= Dygraph
.findPosY(self
.canvas_
);
607 dragStartX
= getX(event
);
608 dragStartY
= getY(event
);
610 if (event
.altKey
|| event
.shiftKey
) {
611 if (!self
.dateWindow_
) return; // have to be zoomed in to pan.
613 dateRange
= self
.dateWindow_
[1] - self
.dateWindow_
[0];
614 draggingDate
= (dragStartX
/ self
.width_
) * dateRange
+
621 // If the user releases the mouse button during a drag, but not over the
622 // canvas, then it doesn't count as a zooming action.
623 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
624 if (isZooming
|| isPanning
) {
637 // Temporarily cancel the dragging event when the mouse leaves the graph
638 Dygraph
.addEvent(this.hidden_
, 'mouseout', function(event
) {
645 // If the mouse is released on the canvas during a drag event, then it's a
646 // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels)
647 Dygraph
.addEvent(this.hidden_
, 'mouseup', function(event
) {
650 dragEndX
= getX(event
);
651 dragEndY
= getY(event
);
652 var regionWidth
= Math
.abs(dragEndX
- dragStartX
);
653 var regionHeight
= Math
.abs(dragEndY
- dragStartY
);
655 if (regionWidth
< 2 && regionHeight
< 2 &&
656 self
.attr_('clickCallback') != null &&
657 self
.lastx_
!= undefined
) {
658 // TODO(danvk): pass along more info about the points.
659 self
.attr_('clickCallback')(event
, self
.lastx_
, self
.selPoints_
);
662 if (regionWidth
>= 10) {
663 self
.doZoom_(Math
.min(dragStartX
, dragEndX
),
664 Math
.max(dragStartX
, dragEndX
));
666 self
.canvas_
.getContext("2d").clearRect(0, 0,
668 self
.canvas_
.height
);
682 // Double-clicking zooms back out
683 Dygraph
.addEvent(this.hidden_
, 'dblclick', function(event
) {
684 if (self
.dateWindow_
== null) return;
685 self
.dateWindow_
= null;
686 self
.drawGraph_(self
.rawData_
);
687 var minDate
= self
.rawData_
[0][0];
688 var maxDate
= self
.rawData_
[self
.rawData_
.length
- 1][0];
689 if (self
.attr_("zoomCallback")) {
690 self
.attr_("zoomCallback")(minDate
, maxDate
);
696 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
697 * up any previous zoom rectangles that were drawn. This could be optimized to
698 * avoid extra redrawing, but it's tricky to avoid interactions with the status
700 * @param {Number} startX The X position where the drag started, in canvas
702 * @param {Number} endX The current X position of the drag, in canvas coords.
703 * @param {Number} prevEndX The value of endX on the previous call to this
704 * function. Used to avoid excess redrawing
707 Dygraph
.prototype.drawZoomRect_
= function(startX
, endX
, prevEndX
) {
708 var ctx
= this.canvas_
.getContext("2d");
710 // Clean up from the previous rect if necessary
712 ctx
.clearRect(Math
.min(startX
, prevEndX
), 0,
713 Math
.abs(startX
- prevEndX
), this.height_
);
716 // Draw a light-grey rectangle to show the new viewing area
717 if (endX
&& startX
) {
718 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
719 ctx
.fillRect(Math
.min(startX
, endX
), 0,
720 Math
.abs(endX
- startX
), this.height_
);
725 * Zoom to something containing [lowX, highX]. These are pixel coordinates
726 * in the canvas. The exact zoom window may be slightly larger if there are no
727 * data points near lowX or highX. This function redraws the graph.
728 * @param {Number} lowX The leftmost pixel value that should be visible.
729 * @param {Number} highX The rightmost pixel value that should be visible.
732 Dygraph
.prototype.doZoom_
= function(lowX
, highX
) {
733 // Find the earliest and latest dates contained in this canvasx range.
734 var points
= this.layout_
.points
;
737 // Find the nearest [minDate, maxDate] that contains [lowX, highX]
738 for (var i
= 0; i
< points
.length
; i
++) {
739 var cx
= points
[i
].canvasx
;
740 var x
= points
[i
].xval
;
741 if (cx
< lowX
&& (minDate
== null || x
> minDate
)) minDate
= x
;
742 if (cx
> highX
&& (maxDate
== null || x
< maxDate
)) maxDate
= x
;
744 // Use the extremes if either is missing
745 if (minDate
== null) minDate
= points
[0].xval
;
746 if (maxDate
== null) maxDate
= points
[points
.length
-1].xval
;
748 this.dateWindow_
= [minDate
, maxDate
];
749 this.drawGraph_(this.rawData_
);
750 if (this.attr_("zoomCallback")) {
751 this.attr_("zoomCallback")(minDate
, maxDate
);
756 * When the mouse moves in the canvas, display information about a nearby data
757 * point and draw dots over those points in the data series. This function
758 * takes care of cleanup of previously-drawn dots.
759 * @param {Object} event The mousemove event from the browser.
762 Dygraph
.prototype.mouseMove_
= function(event
) {
763 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.hidden_
);
764 var points
= this.layout_
.points
;
769 // Loop through all the points and find the date nearest to our current
771 var minDist
= 1e+100;
773 for (var i
= 0; i
< points
.length
; i
++) {
774 var dist
= Math
.abs(points
[i
].canvasx
- canvasx
);
775 if (dist
> minDist
) break;
779 if (idx
>= 0) lastx
= points
[idx
].xval
;
780 // Check that you can really highlight the last day's data
781 if (canvasx
> points
[points
.length
-1].canvasx
)
782 lastx
= points
[points
.length
-1].xval
;
784 // Extract the points we've selected
785 this.selPoints_
= [];
786 for (var i
= 0; i
< points
.length
; i
++) {
787 if (points
[i
].xval
== lastx
) {
790 for (var k
in points
[i
]) {
793 this.selPoints_
.push(p
);
797 if (this.attr_("stackedGraph")) {
798 // "unstack" the points.
799 var cumulative_sum
= 0;
800 for (var j
= this.selPoints_
.length
- 1; j
>= 0; j
--) {
801 this.selPoints_
[j
].yval
-= cumulative_sum
;
802 cumulative_sum
+= this.selPoints_
[j
].yval
;
806 if (this.attr_("highlightCallback")) {
807 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
);
810 // Clear the previously drawn vertical, if there is one
811 var circleSize
= this.attr_('highlightCircleSize');
812 var ctx
= this.canvas_
.getContext("2d");
813 if (this.previousVerticalX_
>= 0) {
814 var px
= this.previousVerticalX_
;
815 ctx
.clearRect(px
- circleSize
- 1, 0, 2 * circleSize
+ 2, this.height_
);
818 var isOK
= function(x
) { return x
&& !isNaN(x
); };
820 if (this.selPoints_
.length
> 0 && !this.attr_('staticLabels')) {
821 var canvasx
= this.selPoints_
[0].canvasx
;
823 // Set the status message to indicate the selected point(s)
824 var replace
= this.attr_('xValueFormatter')(lastx
, this) + ":";
825 var fmtFunc
= this.attr_('yValueFormatter');
826 var clen
= this.colors_
.length
;
827 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
828 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
829 if (this.attr_("labelsSeparateLines")) {
832 var point
= this.selPoints_
[i
];
833 var c
= new RGBColor(this.colors_
[i
%clen
]);
834 var yval
= fmtFunc
? fmtFunc(point
.yval
) : this.round_(point
.yval
, 2);
835 replace
+= " <b><font color='" + c
.toHex() + "'>"
836 + point
.name
+ "</font></b>:"
839 this.attr_("labelsDiv").innerHTML
= replace
;
841 // Save last x position for callbacks.
844 // Draw colored circles over the center of each selected point
846 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
847 if (!isOK(this.selPoints_
[i
%clen
].canvasy
)) continue;
849 ctx
.fillStyle
= this.colors_
[i
%clen
];
850 ctx
.arc(canvasx
, this.selPoints_
[i
%clen
].canvasy
, circleSize
,
851 0, 2 * Math
.PI
, false);
856 this.previousVerticalX_
= canvasx
;
861 * The mouse has left the canvas. Clear out whatever artifacts remain
862 * @param {Object} event the mouseout event from the browser.
865 Dygraph
.prototype.mouseOut_
= function(event
) {
866 if (this.attr_("hideOverlayOnMouseOut")) {
867 // Get rid of the overlay data
868 var ctx
= this.canvas_
.getContext("2d");
869 ctx
.clearRect(0, 0, this.width_
, this.height_
);
870 this.attr_("labelsDiv").innerHTML
= "";
874 Dygraph
.zeropad
= function(x
) {
875 if (x
< 10) return "0" + x
; else return "" + x
;
879 * Return a string version of the hours, minutes and seconds portion of a date.
880 * @param {Number} date The JavaScript date (ms since epoch)
881 * @return {String} A time of the form "HH:MM:SS"
884 Dygraph
.prototype.hmsString_
= function(date
) {
885 var zeropad
= Dygraph
.zeropad
;
886 var d
= new Date(date
);
887 if (d
.getSeconds()) {
888 return zeropad(d
.getHours()) + ":" +
889 zeropad(d
.getMinutes()) + ":" +
890 zeropad(d
.getSeconds());
891 } else if (d
.getMinutes()) {
892 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
894 return zeropad(d
.getHours());
899 * Convert a JS date (millis since epoch) to YYYY/MM/DD
900 * @param {Number} date The JavaScript date (ms since epoch)
901 * @return {String} A date of the form "YYYY/MM/DD"
903 * TODO(danvk): why is this part of the prototype?
905 Dygraph
.dateString_
= function(date
, self
) {
906 var zeropad
= Dygraph
.zeropad
;
907 var d
= new Date(date
);
910 var year
= "" + d
.getFullYear();
911 // Get a 0 padded month string
912 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
913 // Get a 0 padded day string
914 var day
= zeropad(d
.getDate());
917 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
918 if (frac
) ret
= " " + self
.hmsString_(date
);
920 return year
+ "/" + month + "/" + day
+ ret
;
924 * Round a number to the specified number of digits past the decimal point.
925 * @param {Number} num The number to round
926 * @param {Number} places The number of decimals to which to round
927 * @return {Number} The rounded number
930 Dygraph
.prototype.round_
= function(num
, places
) {
931 var shift
= Math
.pow(10, places
);
932 return Math
.round(num
* shift
)/shift
;
936 * Fires when there's data available to be graphed.
937 * @param {String} data Raw CSV data to be plotted
940 Dygraph
.prototype.loadedEvent_
= function(data
) {
941 this.rawData_
= this.parseCSV_(data
);
942 this.drawGraph_(this.rawData_
);
945 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
946 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
947 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
950 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
953 Dygraph
.prototype.addXTicks_
= function() {
954 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
955 var startDate
, endDate
;
956 if (this.dateWindow_
) {
957 startDate
= this.dateWindow_
[0];
958 endDate
= this.dateWindow_
[1];
960 startDate
= this.rawData_
[0][0];
961 endDate
= this.rawData_
[this.rawData_
.length
- 1][0];
964 var xTicks
= this.attr_('xTicker')(startDate
, endDate
, this);
965 this.layout_
.updateOptions({xTicks
: xTicks
});
968 // Time granularity enumeration
969 Dygraph
.SECONDLY
= 0;
970 Dygraph
.TWO_SECONDLY
= 1;
971 Dygraph
.FIVE_SECONDLY
= 2;
972 Dygraph
.TEN_SECONDLY
= 3;
973 Dygraph
.THIRTY_SECONDLY
= 4;
974 Dygraph
.MINUTELY
= 5;
975 Dygraph
.TWO_MINUTELY
= 6;
976 Dygraph
.FIVE_MINUTELY
= 7;
977 Dygraph
.TEN_MINUTELY
= 8;
978 Dygraph
.THIRTY_MINUTELY
= 9;
980 Dygraph
.TWO_HOURLY
= 11;
981 Dygraph
.SIX_HOURLY
= 12;
984 Dygraph
.MONTHLY
= 15;
985 Dygraph
.QUARTERLY
= 16;
986 Dygraph
.BIANNUAL
= 17;
988 Dygraph
.DECADAL
= 19;
989 Dygraph
.NUM_GRANULARITIES
= 20;
991 Dygraph
.SHORT_SPACINGS
= [];
992 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
993 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
994 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
995 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
996 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
997 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
998 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
999 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1000 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1001 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1002 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1003 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1004 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1005 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1006 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1010 // If we used this time granularity, how many ticks would there be?
1011 // This is only an approximation, but it's generally good enough.
1013 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1014 if (granularity
< Dygraph
.MONTHLY
) {
1015 // Generate one tick mark for every fixed interval of time.
1016 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1017 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1019 var year_mod
= 1; // e.g. to only print one point every 10 years.
1020 var num_months
= 12;
1021 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1022 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1023 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1024 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1026 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1027 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1028 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1034 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1035 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1037 // Returns an array containing {v: millis, label: label} dictionaries.
1039 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1041 if (granularity
< Dygraph
.MONTHLY
) {
1042 // Generate one tick mark for every fixed interval of time.
1043 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1044 var format
= '%d%b'; // e.g. "1Jan"
1046 // Find a time less than start_time which occurs on a "nice" time boundary
1047 // for this granularity.
1048 var g
= spacing
/ 1000;
1049 var d
= new Date(start_time
);
1050 if (g
<= 60) { // seconds
1051 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1055 if (g
<= 60) { // minutes
1056 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1061 if (g
<= 24) { // days
1062 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1067 if (g
== 7) { // one week
1068 d
.setDate(d
.getDate() - d
.getDay());
1073 start_time
= d
.getTime();
1075 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1076 var d
= new Date(t
);
1077 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1078 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1079 // the extra hour covers DST problems.
1080 ticks
.push({ v
:t
, label
: new Date(t
+ 3600*1000).strftime(format
) });
1082 ticks
.push({ v
:t
, label
: this.hmsString_(t
) });
1086 // Display a tick mark on the first of a set of months of each year.
1087 // Years get a tick mark iff y % year_mod == 0. This is useful for
1088 // displaying a tick mark once every 10 years, say, on long time scales.
1090 var year_mod
= 1; // e.g. to only print one point every 10 years.
1092 if (granularity
== Dygraph
.MONTHLY
) {
1093 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1094 } else if (granularity
== Dygraph
.QUARTERLY
) {
1095 months
= [ 0, 3, 6, 9 ];
1096 } else if (granularity
== Dygraph
.BIANNUAL
) {
1098 } else if (granularity
== Dygraph
.ANNUAL
) {
1100 } else if (granularity
== Dygraph
.DECADAL
) {
1105 var start_year
= new Date(start_time
).getFullYear();
1106 var end_year
= new Date(end_time
).getFullYear();
1107 var zeropad
= Dygraph
.zeropad
;
1108 for (var i
= start_year
; i
<= end_year
; i
++) {
1109 if (i
% year_mod
!= 0) continue;
1110 for (var j
= 0; j
< months
.length
; j
++) {
1111 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1112 var t
= Date
.parse(date_str
);
1113 if (t
< start_time
|| t
> end_time
) continue;
1114 ticks
.push({ v
:t
, label
: new Date(t
).strftime('%b %y') });
1124 * Add ticks to the x-axis based on a date range.
1125 * @param {Number} startDate Start of the date window (millis since epoch)
1126 * @param {Number} endDate End of the date window (millis since epoch)
1127 * @return {Array.<Object>} Array of {label, value} tuples.
1130 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1132 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1133 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1134 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1141 return self
.GetXAxis(startDate
, endDate
, chosen
);
1143 // TODO(danvk): signal error.
1148 * Add ticks when the x axis has numbers on it (instead of dates)
1149 * @param {Number} startDate Start of the date window (millis since epoch)
1150 * @param {Number} endDate End of the date window (millis since epoch)
1151 * @return {Array.<Object>} Array of {label, value} tuples.
1154 Dygraph
.numericTicks
= function(minV
, maxV
, self
) {
1156 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1157 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1158 // The first spacing greater than pixelsPerYLabel is what we use.
1159 // TODO(danvk): version that works on a log scale.
1160 if (self
.attr_("labelsKMG2")) {
1161 var mults
= [1, 2, 4, 8];
1163 var mults
= [1, 2, 5];
1165 var scale
, low_val
, high_val
, nTicks
;
1166 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1167 var pixelsPerTick
= self
.attr_('pixelsPerYLabel');
1168 for (var i
= -10; i
< 50; i
++) {
1169 if (self
.attr_("labelsKMG2")) {
1170 var base_scale
= Math
.pow(16, i
);
1172 var base_scale
= Math
.pow(10, i
);
1174 for (var j
= 0; j
< mults
.length
; j
++) {
1175 scale
= base_scale
* mults
[j
];
1176 low_val
= Math
.floor(minV
/ scale
) * scale
;
1177 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1178 nTicks
= (high_val
- low_val
) / scale
;
1179 var spacing
= self
.height_
/ nTicks
;
1180 // wish I could break out of both loops at once...
1181 if (spacing
> pixelsPerTick
) break;
1183 if (spacing
> pixelsPerTick
) break;
1186 // Construct labels for the ticks
1190 if (self
.attr_("labelsKMB")) {
1192 k_labels
= [ "K", "M", "B", "T" ];
1194 if (self
.attr_("labelsKMG2")) {
1195 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1197 k_labels
= [ "k", "M", "G", "T" ];
1200 for (var i
= 0; i
< nTicks
; i
++) {
1201 var tickV
= low_val
+ i
* scale
;
1202 var absTickV
= Math
.abs(tickV
);
1203 var label
= self
.round_(tickV
, 2);
1204 if (k_labels
.length
) {
1205 // Round up to an appropriate unit.
1207 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
1208 if (absTickV
>= n
) {
1209 label
= self
.round_(tickV
/ n
, 1) + k_labels
[j
];
1214 ticks
.push( {label
: label
, v
: tickV
} );
1220 * Adds appropriate ticks on the y-axis
1221 * @param {Number} minY The minimum Y value in the data set
1222 * @param {Number} maxY The maximum Y value in the data set
1225 Dygraph
.prototype.addYTicks_
= function(minY
, maxY
) {
1226 // Set the number of ticks so that the labels are human-friendly.
1227 // TODO(danvk): make this an attribute as well.
1228 var ticks
= Dygraph
.numericTicks(minY
, maxY
, this);
1229 this.layout_
.updateOptions( { yAxis
: [minY
, maxY
],
1233 // Computes the range of the data series (including confidence intervals).
1234 // series is either [ [x1, y1], [x2, y2], ... ] or
1235 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1236 // Returns [low, high]
1237 Dygraph
.prototype.extremeValues_
= function(series
) {
1238 var minY
= null, maxY
= null;
1240 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1242 // With custom bars, maxY is the max of the high values.
1243 for (var j
= 0; j
< series
.length
; j
++) {
1244 var y
= series
[j
][1][0];
1246 var low
= y
- series
[j
][1][1];
1247 var high
= y
+ series
[j
][1][2];
1248 if (low
> y
) low
= y
; // this can happen with custom bars,
1249 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1250 if (maxY
== null || high
> maxY
) {
1253 if (minY
== null || low
< minY
) {
1258 for (var j
= 0; j
< series
.length
; j
++) {
1259 var y
= series
[j
][1];
1260 if (y
=== null || isNaN(y
)) continue;
1261 if (maxY
== null || y
> maxY
) {
1264 if (minY
== null || y
< minY
) {
1270 return [minY
, maxY
];
1274 * Update the graph with new data. Data is in the format
1275 * [ [date1, val1, val2, ...], [date2, val1, val2, ...] if errorBars=false
1276 * or, if errorBars=true,
1277 * [ [date1, [val1,stddev1], [val2,stddev2], ...], [date2, ...], ...]
1278 * @param {Array.<Object>} data The data (see above)
1281 Dygraph
.prototype.drawGraph_
= function(data
) {
1282 var minY
= null, maxY
= null;
1283 this.layout_
.removeAllDatasets();
1285 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
1287 // For stacked series.
1288 var cumulative_y
= [];
1291 // Loop over all fields in the dataset
1293 for (var i
= 1; i
< data
[0].length
; i
++) {
1294 if (!this.visibility()[i
- 1]) continue;
1297 for (var j
= 0; j
< data
.length
; j
++) {
1298 var date
= data
[j
][0];
1299 series
[j
] = [date
, data
[j
][i
]];
1301 series
= this.rollingAverage(series
, this.rollPeriod_
);
1303 // Prune down to the desired range, if necessary (for zooming)
1304 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1305 if (this.dateWindow_
) {
1306 var low
= this.dateWindow_
[0];
1307 var high
= this.dateWindow_
[1];
1309 for (var k
= 0; k
< series
.length
; k
++) {
1310 if (series
[k
][0] >= low
&& series
[k
][0] <= high
) {
1311 pruned
.push(series
[k
]);
1317 var extremes
= this.extremeValues_(series
);
1318 var thisMinY
= extremes
[0];
1319 var thisMaxY
= extremes
[1];
1320 if (!minY
|| thisMinY
< minY
) minY
= thisMinY
;
1321 if (!maxY
|| thisMaxY
> maxY
) maxY
= thisMaxY
;
1325 for (var j
=0; j
<series
.length
; j
++)
1326 vals
[j
] = [series
[j
][0],
1327 series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
1328 this.layout_
.addDataset(this.attr_("labels")[i
], vals
);
1329 } else if (this.attr_("stackedGraph")) {
1331 var l
= series
.length
;
1333 for (var j
= 0; j
< l
; j
++) {
1334 if (cumulative_y
[series
[j
][0]] === undefined
)
1335 cumulative_y
[series
[j
][0]] = 0;
1337 actual_y
= series
[j
][1];
1338 cumulative_y
[series
[j
][0]] += actual_y
;
1340 vals
[j
] = [series
[j
][0], cumulative_y
[series
[j
][0]]]
1342 if (!maxY
|| cumulative_y
[series
[j
][0]] > maxY
)
1343 maxY
= cumulative_y
[series
[j
][0]];
1345 datasets
.push([this.attr_("labels")[i
], vals
]);
1346 //this.layout_.addDataset(this.attr_("labels")[i], vals);
1348 this.layout_
.addDataset(this.attr_("labels")[i
], series
);
1352 if (datasets
.length
> 0) {
1353 for (var i
= (datasets
.length
- 1); i
>= 0; i
--) {
1354 this.layout_
.addDataset(datasets
[i
][0], datasets
[i
][1]);
1358 // Use some heuristics to come up with a good maxY value, unless it's been
1359 // set explicitly by the user.
1360 if (this.valueRange_
!= null) {
1361 this.addYTicks_(this.valueRange_
[0], this.valueRange_
[1]);
1363 // This affects the calculation of span, below.
1364 if (this.attr_("includeZero") && minY
> 0) {
1368 // Add some padding and round up to an integer to be human-friendly.
1369 var span
= maxY
- minY
;
1370 // special case: if we have no sense of scale, use +/-10% of the sole value
.
1371 if (span
== 0) { span
= maxY
; }
1372 var maxAxisY
= maxY
+ 0.1 * span
;
1373 var minAxisY
= minY
- 0.1 * span
;
1375 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
1376 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
1377 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
1379 if (this.attr_("includeZero")) {
1380 if (maxY
< 0) maxAxisY
= 0;
1381 if (minY
> 0) minAxisY
= 0;
1384 this.addYTicks_(minAxisY
, maxAxisY
);
1389 // Tell PlotKit to use this new data and render itself
1390 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
1391 this.layout_
.evaluateWithError();
1392 this.plotter_
.clear();
1393 this.plotter_
.render();
1394 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
1395 this.canvas_
.height
);
1399 * Calculates the rolling average of a data set.
1400 * If originalData is [label, val], rolls the average of those.
1401 * If originalData is [label, [, it's interpreted as [value, stddev]
1402 * and the roll is returned in the same form, with appropriately reduced
1403 * stddev for each value.
1404 * Note that this is where fractional input (i.e. '5/10') is converted into
1406 * @param {Array} originalData The data in the appropriate format (see above)
1407 * @param {Number} rollPeriod The number of days over which to average the data
1409 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
1410 if (originalData
.length
< 2)
1411 return originalData
;
1412 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
1413 var rollingData
= [];
1414 var sigma
= this.attr_("sigma");
1416 if (this.fractions_
) {
1418 var den
= 0; // numerator/denominator
1420 for (var i
= 0; i
< originalData
.length
; i
++) {
1421 num
+= originalData
[i
][1][0];
1422 den
+= originalData
[i
][1][1];
1423 if (i
- rollPeriod
>= 0) {
1424 num
-= originalData
[i
- rollPeriod
][1][0];
1425 den
-= originalData
[i
- rollPeriod
][1][1];
1428 var date
= originalData
[i
][0];
1429 var value
= den
? num
/ den
: 0.0;
1430 if (this.attr_("errorBars")) {
1431 if (this.wilsonInterval_
) {
1432 // For more details on this confidence interval, see:
1433 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
1435 var p
= value
< 0 ? 0 : value
, n
= den
;
1436 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
1437 var denom
= 1 + sigma
* sigma
/ den
;
1438 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
1439 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
1440 rollingData
[i
] = [date
,
1441 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
1443 rollingData
[i
] = [date
, [0, 0, 0]];
1446 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
1447 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
1450 rollingData
[i
] = [date
, mult
* value
];
1453 } else if (this.attr_("customBars")) {
1458 for (var i
= 0; i
< originalData
.length
; i
++) {
1459 var data
= originalData
[i
][1];
1461 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
1463 if (y
!= null && !isNaN(y
)) {
1469 if (i
- rollPeriod
>= 0) {
1470 var prev
= originalData
[i
- rollPeriod
];
1471 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
1478 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
1479 1.0 * (mid
- low
) / count
,
1480 1.0 * (high
- mid
) / count
]];
1483 // Calculate the rolling average for the first rollPeriod - 1 points where
1484 // there is not enough data to roll over the full number of days
1485 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
1486 if (!this.attr_("errorBars")){
1487 if (rollPeriod
== 1) {
1488 return originalData
;
1491 for (var i
= 0; i
< originalData
.length
; i
++) {
1494 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
1495 var y
= originalData
[j
][1];
1496 if (y
== null || isNaN(y
)) continue;
1498 sum
+= originalData
[j
][1];
1501 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
1503 rollingData
[i
] = [originalData
[i
][0], null];
1508 for (var i
= 0; i
< originalData
.length
; i
++) {
1512 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
1513 var y
= originalData
[j
][1][0];
1514 if (y
== null || isNaN(y
)) continue;
1516 sum
+= originalData
[j
][1][0];
1517 variance
+= Math
.pow(originalData
[j
][1][1], 2);
1520 var stddev
= Math
.sqrt(variance
) / num_ok
;
1521 rollingData
[i
] = [originalData
[i
][0],
1522 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
1524 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
1534 * Parses a date, returning the number of milliseconds since epoch. This can be
1535 * passed in as an xValueParser in the Dygraph constructor.
1536 * TODO(danvk): enumerate formats that this understands.
1537 * @param {String} A date in YYYYMMDD format.
1538 * @return {Number} Milliseconds since epoch.
1541 Dygraph
.dateParser
= function(dateStr
, self
) {
1544 if (dateStr
.length
== 10 && dateStr
.search("-") != -1) { // e.g. '2009-07-12'
1545 dateStrSlashed
= dateStr
.replace("-", "/", "g");
1546 while (dateStrSlashed
.search("-") != -1) {
1547 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
1549 d
= Date
.parse(dateStrSlashed
);
1550 } else if (dateStr
.length
== 8) { // e.g. '20090712'
1551 // TODO(danvk): remove support for this format. It's confusing.
1552 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
1553 + "/" + dateStr
.substr(6,2);
1554 d
= Date
.parse(dateStrSlashed
);
1556 // Any format that Date.parse will accept, e.g. "2009/07/12" or
1557 // "2009/07/12 12:34:56"
1558 d
= Date
.parse(dateStr
);
1561 if (!d
|| isNaN(d
)) {
1562 self
.error("Couldn't parse " + dateStr
+ " as a date");
1568 * Detects the type of the str (date or numeric) and sets the various
1569 * formatting attributes in this.attrs_ based on this type.
1570 * @param {String} str An x value.
1573 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
1575 if (str
.indexOf('-') >= 0 ||
1576 str
.indexOf('/') >= 0 ||
1577 isNaN(parseFloat(str
))) {
1579 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
1580 // TODO(danvk): remove support for this format.
1585 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
1586 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
1587 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
1589 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
1590 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
1591 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
1596 * Parses a string in a special csv format. We expect a csv file where each
1597 * line is a date point, and the first field in each line is the date string.
1598 * We also expect that all remaining fields represent series.
1599 * if the errorBars attribute is set, then interpret the fields as:
1600 * date, series1, stddev1, series2, stddev2, ...
1601 * @param {Array.<Object>} data See above.
1604 * @return Array.<Object> An array with one entry for each row. These entries
1605 * are an array of cells in that row. The first entry is the parsed x-value for
1606 * the row. The second, third, etc. are the y-values. These can take on one of
1607 * three forms, depending on the CSV and constructor parameters:
1609 * 2. [ value, stddev ]
1610 * 3. [ low value, center value, high value ]
1612 Dygraph
.prototype.parseCSV_
= function(data
) {
1614 var lines
= data
.split("\n");
1616 // Use the default delimiter or fall back to a tab if that makes sense.
1617 var delim
= this.attr_('delimiter');
1618 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
1623 if (this.labelsFromCSV_
) {
1625 this.attrs_
.labels
= lines
[0].split(delim
);
1629 var defaultParserSet
= false; // attempt to auto-detect x value type
1630 var expectedCols
= this.attr_("labels").length
;
1631 var outOfOrder
= false;
1632 for (var i
= start
; i
< lines
.length
; i
++) {
1633 var line
= lines
[i
];
1634 if (line
.length
== 0) continue; // skip blank lines
1635 if (line
[0] == '#') continue; // skip comment lines
1636 var inFields
= line
.split(delim
);
1637 if (inFields
.length
< 2) continue;
1640 if (!defaultParserSet
) {
1641 this.detectTypeFromString_(inFields
[0]);
1642 xParser
= this.attr_("xValueParser");
1643 defaultParserSet
= true;
1645 fields
[0] = xParser(inFields
[0], this);
1647 // If fractions are expected, parse the numbers as "A/B
"
1648 if (this.fractions_) {
1649 for (var j = 1; j < inFields.length; j++) {
1650 // TODO(danvk): figure out an appropriate way to flag parse errors.
1651 var vals = inFields[j].split("/");
1652 fields[j] = [parseFloat(vals[0]), parseFloat(vals[1])];
1654 } else if (this.attr_("errorBars
")) {
1655 // If there are error bars, values are (value, stddev) pairs
1656 for (var j = 1; j < inFields.length; j += 2)
1657 fields[(j + 1) / 2] = [parseFloat(inFields[j]),
1658 parseFloat(inFields[j + 1])];
1659 } else if (this.attr_("customBars
")) {
1660 // Bars are a low;center;high tuple
1661 for (var j = 1; j < inFields.length; j++) {
1662 var vals = inFields[j].split(";");
1663 fields[j] = [ parseFloat(vals[0]),
1664 parseFloat(vals[1]),
1665 parseFloat(vals[2]) ];
1668 // Values are just numbers
1669 for (var j = 1; j < inFields.length; j++) {
1670 fields[j] = parseFloat(inFields[j]);
1673 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
1678 if (fields.length != expectedCols) {
1679 this.error("Number of columns
in line
" + i + " (" + fields.length +
1680 ") does not agree
with number of
labels (" + expectedCols +
1686 this.warn("CSV is out of order
; order it correctly to speed loading
.");
1687 ret.sort(function(a,b) { return a[0] - b[0] });
1694 * The user has provided their data as a pre-packaged JS array. If the x values
1695 * are numeric, this is the same as dygraphs' internal format. If the x values
1696 * are dates, we need to convert them from Date objects to ms since epoch.
1697 * @param {Array.<Object>} data
1698 * @return {Array.<Object>} data with numeric x values.
1700 Dygraph.prototype.parseArray_ = function(data) {
1701 // Peek at the first x value to see if it's numeric.
1702 if (data.length == 0) {
1703 this.error("Can
't plot empty data set");
1706 if (data[0].length == 0) {
1707 this.error("Data set cannot contain an empty row");
1711 if (this.attr_("labels") == null) {
1712 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
1713 "in the options parameter");
1714 this.attrs_.labels = [ "X" ];
1715 for (var i = 1; i < data[0].length; i++) {
1716 this.attrs_.labels.push("Y" + i);
1720 if (Dygraph.isDateLike(data[0][0])) {
1721 // Some intelligent defaults for a date x-axis.
1722 this.attrs_.xValueFormatter = Dygraph.dateString_;
1723 this.attrs_.xTicker = Dygraph.dateTicker;
1725 // Assume they're all dates
.
1726 var parsedData
= Dygraph
.clone(data
);
1727 for (var i
= 0; i
< data
.length
; i
++) {
1728 if (parsedData
[i
].length
== 0) {
1729 this.error("Row " << (1 + i
) << " of data is empty");
1732 if (parsedData
[i
][0] == null
1733 || typeof(parsedData
[i
][0].getTime
) != 'function') {
1734 this.error("x value in row " << (1 + i
) << " is not a Date");
1737 parsedData
[i
][0] = parsedData
[i
][0].getTime();
1741 // Some intelligent defaults for a numeric x-axis.
1742 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
1743 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
1749 * Parses a DataTable object from gviz.
1750 * The data is expected to have a first column that is either a date or a
1751 * number. All subsequent columns must be numbers. If there is a clear mismatch
1752 * between this.xValueParser_ and the type of the first column, it will be
1753 * fixed. Returned value is in the same format as return value of parseCSV_.
1754 * @param {Array.<Object>} data See above.
1757 Dygraph
.prototype.parseDataTable_
= function(data
) {
1758 var cols
= data
.getNumberOfColumns();
1759 var rows
= data
.getNumberOfRows();
1761 // Read column labels
1763 for (var i
= 0; i
< cols
; i
++) {
1764 labels
.push(data
.getColumnLabel(i
));
1765 if (i
!= 0 && this.attr_("errorBars")) i
+= 1;
1767 this.attrs_
.labels
= labels
;
1768 cols
= labels
.length
;
1770 var indepType
= data
.getColumnType(0);
1771 if (indepType
== 'date' || indepType
== 'datetime') {
1772 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
1773 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
1774 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
1775 } else if (indepType
== 'number') {
1776 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
1777 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
1778 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
1780 this.error("only 'date', 'datetime' and 'number' types are supported for " +
1781 "column 1 of DataTable input (Got '" + indepType
+ "')");
1786 var outOfOrder
= false;
1787 for (var i
= 0; i
< rows
; i
++) {
1789 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
1790 data
.getValue(i
, 0) === null) {
1791 this.warning("Ignoring row " + i
+
1792 " of DataTable because of undefined or null first column.");
1796 if (indepType
== 'date' || indepType
== 'datetime') {
1797 row
.push(data
.getValue(i
, 0).getTime());
1799 row
.push(data
.getValue(i
, 0));
1801 if (!this.attr_("errorBars")) {
1802 for (var j
= 1; j
< cols
; j
++) {
1803 row
.push(data
.getValue(i
, j
));
1806 for (var j
= 0; j
< cols
- 1; j
++) {
1807 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
1810 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
1817 this.warn("DataTable is out of order; order it correctly to speed loading.");
1818 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
1823 // These functions are all based on MochiKit.
1824 Dygraph
.update
= function (self
, o
) {
1825 if (typeof(o
) != 'undefined' && o
!== null) {
1827 if (o
.hasOwnProperty(k
)) {
1835 Dygraph
.isArrayLike
= function (o
) {
1836 var typ
= typeof(o
);
1838 (typ
!= 'object' && !(typ
== 'function' &&
1839 typeof(o
.item
) == 'function')) ||
1841 typeof(o
.length
) != 'number' ||
1849 Dygraph
.isDateLike
= function (o
) {
1850 if (typeof(o
) != "object" || o
=== null ||
1851 typeof(o
.getTime
) != 'function') {
1857 Dygraph
.clone
= function(o
) {
1858 // TODO(danvk): figure out how MochiKit's version works
1860 for (var i
= 0; i
< o
.length
; i
++) {
1861 if (Dygraph
.isArrayLike(o
[i
])) {
1862 r
.push(Dygraph
.clone(o
[i
]));
1872 * Get the CSV data. If it's in a function, call that function. If it's in a
1873 * file, do an XMLHttpRequest to get it.
1876 Dygraph
.prototype.start_
= function() {
1877 if (typeof this.file_
== 'function') {
1878 // CSV string. Pretend we got it via XHR.
1879 this.loadedEvent_(this.file_());
1880 } else if (Dygraph
.isArrayLike(this.file_
)) {
1881 this.rawData_
= this.parseArray_(this.file_
);
1882 this.drawGraph_(this.rawData_
);
1883 } else if (typeof this.file_
== 'object' &&
1884 typeof this.file_
.getColumnRange
== 'function') {
1885 // must be a DataTable from gviz.
1886 this.rawData_
= this.parseDataTable_(this.file_
);
1887 this.drawGraph_(this.rawData_
);
1888 } else if (typeof this.file_
== 'string') {
1889 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
1890 if (this.file_
.indexOf('\n') >= 0) {
1891 this.loadedEvent_(this.file_
);
1893 var req
= new XMLHttpRequest();
1895 req
.onreadystatechange
= function () {
1896 if (req
.readyState
== 4) {
1897 if (req
.status
== 200) {
1898 caller
.loadedEvent_(req
.responseText
);
1903 req
.open("GET", this.file_
, true);
1907 this.error("Unknown data format: " + (typeof this.file_
));
1912 * Changes various properties of the graph. These can include:
1914 * <li>file: changes the source data for the graph</li>
1915 * <li>errorBars: changes whether the data contains stddev</li>
1917 * @param {Object} attrs The new properties and values
1919 Dygraph
.prototype.updateOptions
= function(attrs
) {
1920 // TODO(danvk): this is a mess. Rethink this function.
1921 if (attrs
.rollPeriod
) {
1922 this.rollPeriod_
= attrs
.rollPeriod
;
1924 if (attrs
.dateWindow
) {
1925 this.dateWindow_
= attrs
.dateWindow
;
1927 if (attrs
.valueRange
) {
1928 this.valueRange_
= attrs
.valueRange
;
1930 Dygraph
.update(this.user_attrs_
, attrs
);
1932 this.labelsFromCSV_
= (this.attr_("labels") == null);
1934 // TODO(danvk): this doesn't match the constructor logic
1935 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
1936 if (attrs
['file'] && attrs
['file'] != this.file_
) {
1937 this.file_
= attrs
['file'];
1940 this.drawGraph_(this.rawData_
);
1945 * Resizes the dygraph. If no parameters are specified, resizes to fill the
1946 * containing div (which has presumably changed size since the dygraph was
1947 * instantiated. If the width/height are specified, the div will be resized.
1949 * This is far more efficient than destroying and re-instantiating a
1950 * Dygraph, since it doesn't have to reparse the underlying data.
1952 * @param {Number} width Width (in pixels)
1953 * @param {Number} height Height (in pixels)
1955 Dygraph
.prototype.resize
= function(width
, height
) {
1956 if ((width
=== null) != (height
=== null)) {
1957 this.warn("Dygraph.resize() should be called with zero parameters or " +
1958 "two non-NULL parameters. Pretending it was zero.");
1959 width
= height
= null;
1962 // TODO(danvk): there should be a clear() method.
1963 this.maindiv_
.innerHTML
= "";
1964 this.attrs_
.labelsDiv
= null;
1967 this.maindiv_
.style
.width
= width
+ "px";
1968 this.maindiv_
.style
.height
= height
+ "px";
1969 this.width_
= width
;
1970 this.height_
= height
;
1972 this.width_
= this.maindiv_
.offsetWidth
;
1973 this.height_
= this.maindiv_
.offsetHeight
;
1976 this.createInterface_();
1977 this.drawGraph_(this.rawData_
);
1981 * Adjusts the number of days in the rolling average. Updates the graph to
1982 * reflect the new averaging period.
1983 * @param {Number} length Number of days over which to average the data.
1985 Dygraph
.prototype.adjustRoll
= function(length
) {
1986 this.rollPeriod_
= length
;
1987 this.drawGraph_(this.rawData_
);
1991 * Returns a boolean array of visibility statuses.
1993 Dygraph
.prototype.visibility
= function() {
1994 // Do lazy-initialization, so that this happens after we know the number of
1996 if (!this.attr_("visibility")) {
1997 this.attrs_
["visibility"] = [];
1999 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
2000 this.attr_("visibility").push(true);
2002 return this.attr_("visibility");
2006 * Changes the visiblity of a series.
2008 Dygraph
.prototype.setVisibility
= function(num
, value
) {
2009 var x
= this.visibility();
2010 if (num
< 0 && num
>= x
.length
) {
2011 this.warn("invalid series number in setVisibility: " + num
);
2014 this.drawGraph_(this.rawData_
);
2019 * Create a new canvas element. This is more complex than a simple
2020 * document.createElement("canvas") because of IE and excanvas.
2022 Dygraph
.createCanvas
= function() {
2023 var canvas
= document
.createElement("canvas");
2025 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
2027 canvas
= G_vmlCanvasManager
.initElement(canvas
);
2035 * A wrapper around Dygraph that implements the gviz API.
2036 * @param {Object} container The DOM object the visualization should live in.
2038 Dygraph
.GVizChart
= function(container
) {
2039 this.container
= container
;
2042 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
2043 this.container
.innerHTML
= '';
2044 this.date_graph
= new Dygraph(this.container
, data
, options
);
2047 // Older pages may still use this name.
2048 DateGraph
= Dygraph
;