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://dygraphs.com/
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;
83 // Default attribute values.
84 Dygraph
.DEFAULT_ATTRS
= {
85 highlightCircleSize
: 3,
91 // TODO(danvk): move defaults from createStatusMessage_ here.
93 labelsSeparateLines
: false,
94 labelsShowZeroValues
: true,
97 showLabelsOnHighlight
: true,
99 yValueFormatter
: function(x
) { return Dygraph
.round_(x
, 2); },
104 axisLabelFontSize
: 14,
107 xAxisLabelFormatter
: Dygraph
.dateAxisFormatter
,
111 xValueFormatter
: Dygraph
.dateString_
,
112 xValueParser
: Dygraph
.dateParser
,
113 xTicker
: Dygraph
.dateTicker
,
121 wilsonInterval
: true, // only relevant if fractions is true
125 connectSeparatedPoints
: false,
128 hideOverlayOnMouseOut
: true,
133 interactionModel
: null // will be set to Dygraph.defaultInteractionModel.
136 // Various logging levels.
142 // Directions for panning and zooming. Use bit operations when combined
143 // values are possible.
144 Dygraph
.HORIZONTAL
= 1;
145 Dygraph
.VERTICAL
= 2;
147 // Used for initializing annotation CSS rules only once.
148 Dygraph
.addedAnnotationCSS
= false;
150 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
151 // Labels is no longer a constructor parameter, since it's typically set
152 // directly from the data source. It also conains a name for the x-axis,
153 // which the previous constructor form did not.
154 if (labels
!= null) {
155 var new_labels
= ["Date"];
156 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
157 Dygraph
.update(attrs
, { 'labels': new_labels
});
159 this.__init__(div
, file
, attrs
);
163 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
164 * and context <canvas> inside of it. See the constructor for details.
166 * @param {Element} div the Element to render the graph into.
167 * @param {String | Function} file Source data
168 * @param {Object} attrs Miscellaneous other options
171 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
172 // Hack for IE: if we're using excanvas and the document hasn't finished
173 // loading yet (and hence may not have initialized whatever it needs to
174 // initialize), then keep calling this routine periodically until it has.
175 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
176 typeof(G_vmlCanvasManager
) != 'undefined' &&
177 document
.readyState
!= 'complete') {
179 setTimeout(function() { self
.__init__(div
, file
, attrs
) }, 100);
182 // Support two-argument constructor
183 if (attrs
== null) { attrs
= {}; }
185 // Copy the important bits into the object
186 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
189 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
190 this.previousVerticalX_
= -1;
191 this.fractions_
= attrs
.fractions
|| false;
192 this.dateWindow_
= attrs
.dateWindow
|| null;
194 this.wilsonInterval_
= attrs
.wilsonInterval
|| true;
195 this.is_initial_draw_
= true;
196 this.annotations_
= [];
198 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
199 this.zoomed_x_
= false;
200 this.zoomed_y_
= false;
202 // Clear the div. This ensure that, if multiple dygraphs are passed the same
203 // div, then only one will be drawn.
206 // If the div isn't already sized then inherit from our attrs or
207 // give it a default size.
208 if (div
.style
.width
== '') {
209 div
.style
.width
= (attrs
.width
|| Dygraph
.DEFAULT_WIDTH
) + "px";
211 if (div
.style
.height
== '') {
212 div
.style
.height
= (attrs
.height
|| Dygraph
.DEFAULT_HEIGHT
) + "px";
214 this.width_
= parseInt(div
.style
.width
, 10);
215 this.height_
= parseInt(div
.style
.height
, 10);
216 // The div might have been specified as percent of the current window size,
217 // convert that to an appropriate number of pixels.
218 if (div
.style
.width
.indexOf("%") == div
.style
.width
.length
- 1) {
219 this.width_
= div
.offsetWidth
;
221 if (div
.style
.height
.indexOf("%") == div
.style
.height
.length
- 1) {
222 this.height_
= div
.offsetHeight
;
225 if (this.width_
== 0) {
226 this.error("dygraph has zero width. Please specify a width in pixels.");
228 if (this.height_
== 0) {
229 this.error("dygraph has zero height. Please specify a height in pixels.");
232 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
233 if (attrs
['stackedGraph']) {
234 attrs
['fillGraph'] = true;
235 // TODO(nikhilk): Add any other stackedGraph checks here.
238 // Dygraphs has many options, some of which interact with one another.
239 // To keep track of everything, we maintain two sets of options:
241 // this.user_attrs_ only options explicitly set by the user.
242 // this.attrs_ defaults, options derived from user_attrs_, data.
244 // Options are then accessed this.attr_('attr'), which first looks at
245 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
246 // defaults without overriding behavior that the user specifically asks for.
247 this.user_attrs_
= {};
248 Dygraph
.update(this.user_attrs_
, attrs
);
251 Dygraph
.update(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
253 this.boundaryIds_
= [];
255 // Make a note of whether labels will be pulled from the CSV file.
256 this.labelsFromCSV_
= (this.attr_("labels") == null);
258 // Create the containing DIV and other interactive elements
259 this.createInterface_();
264 // axis is an optional parameter. Can be set to 'x' or 'y'.
265 Dygraph
.prototype.isZoomed
= function(axis
) {
266 if (axis
== null) return this.zoomed_x_
|| this.zoomed_y_
;
267 if (axis
== 'x') return this.zoomed_x_
;
268 if (axis
== 'y') return this.zoomed_y_
;
269 throw "axis parameter to Dygraph.isZoomed must be missing, 'x' or 'y'.";
272 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
274 typeof(this.user_attrs_
[seriesName
]) != 'undefined' &&
275 this.user_attrs_
[seriesName
] != null &&
276 typeof(this.user_attrs_
[seriesName
][name
]) != 'undefined') {
277 return this.user_attrs_
[seriesName
][name
];
278 } else if (typeof(this.user_attrs_
[name
]) != 'undefined') {
279 return this.user_attrs_
[name
];
280 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
281 return this.attrs_
[name
];
287 // TODO(danvk): any way I can get the line numbers to be this.warn call?
288 Dygraph
.prototype.log
= function(severity
, message
) {
289 if (typeof(console
) != 'undefined') {
292 console
.debug('dygraphs: ' + message
);
295 console
.info('dygraphs: ' + message
);
297 case Dygraph
.WARNING
:
298 console
.warn('dygraphs: ' + message
);
301 console
.error('dygraphs: ' + message
);
306 Dygraph
.prototype.info
= function(message
) {
307 this.log(Dygraph
.INFO
, message
);
309 Dygraph
.prototype.warn
= function(message
) {
310 this.log(Dygraph
.WARNING
, message
);
312 Dygraph
.prototype.error
= function(message
) {
313 this.log(Dygraph
.ERROR
, message
);
317 * Returns the current rolling period, as set by the user or an option.
318 * @return {Number} The number of days in the rolling window
320 Dygraph
.prototype.rollPeriod
= function() {
321 return this.rollPeriod_
;
325 * Returns the currently-visible x-range. This can be affected by zooming,
326 * panning or a call to updateOptions.
327 * Returns a two-element array: [left, right].
328 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
330 Dygraph
.prototype.xAxisRange
= function() {
331 if (this.dateWindow_
) return this.dateWindow_
;
333 // The entire chart is visible.
334 var left
= this.rawData_
[0][0];
335 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
336 return [left
, right
];
340 * Returns the currently-visible y-range for an axis. This can be affected by
341 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
342 * called with no arguments, returns the range of the first axis.
343 * Returns a two-element array: [bottom, top].
345 Dygraph
.prototype.yAxisRange
= function(idx
) {
346 if (typeof(idx
) == "undefined") idx
= 0;
347 if (idx
< 0 || idx
>= this.axes_
.length
) return null;
348 return [ this.axes_
[idx
].computedValueRange
[0],
349 this.axes_
[idx
].computedValueRange
[1] ];
353 * Returns the currently-visible y-ranges for each axis. This can be affected by
354 * zooming, panning, calls to updateOptions, etc.
355 * Returns an array of [bottom, top] pairs, one for each y-axis.
357 Dygraph
.prototype.yAxisRanges
= function() {
359 for (var i
= 0; i
< this.axes_
.length
; i
++) {
360 ret
.push(this.yAxisRange(i
));
365 // TODO(danvk): use these functions throughout dygraphs.
367 * Convert from data coordinates to canvas/div X/Y coordinates.
368 * If specified, do this conversion for the coordinate system of a particular
369 * axis. Uses the first axis by default.
370 * Returns a two-element array: [X, Y]
372 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
373 var ret
= [null, null];
374 var area
= this.plotter_
.area
;
376 var xRange
= this.xAxisRange();
377 ret
[0] = area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
381 var yRange
= this.yAxisRange(axis
);
382 ret
[1] = area
.y
+ (yRange
[1] - y
) / (yRange
[1] - yRange
[0]) * area
.h
;
389 * Convert from canvas/div coords to data coordinates.
390 * If specified, do this conversion for the coordinate system of a particular
391 * axis. Uses the first axis by default.
392 * Returns a two-element array: [X, Y]
394 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
395 var ret
= [null, null];
396 var area
= this.plotter_
.area
;
398 var xRange
= this.xAxisRange();
399 ret
[0] = xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
403 var yRange
= this.yAxisRange(axis
);
404 ret
[1] = yRange
[0] + (area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
411 * Returns the number of columns (including the independent variable).
413 Dygraph
.prototype.numColumns
= function() {
414 return this.rawData_
[0].length
;
418 * Returns the number of rows (excluding any header/label row).
420 Dygraph
.prototype.numRows
= function() {
421 return this.rawData_
.length
;
425 * Returns the value in the given row and column. If the row and column exceed
426 * the bounds on the data, returns null. Also returns null if the value is
429 Dygraph
.prototype.getValue
= function(row
, col
) {
430 if (row
< 0 || row
> this.rawData_
.length
) return null;
431 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
433 return this.rawData_
[row
][col
];
436 Dygraph
.addEvent
= function(el
, evt
, fn
) {
437 var normed_fn
= function(e
) {
438 if (!e
) var e
= window
.event
;
441 if (window
.addEventListener
) { // Mozilla, Netscape, Firefox
442 el
.addEventListener(evt
, normed_fn
, false);
444 el
.attachEvent('on' + evt
, normed_fn
);
449 // Based on the article at
450 // http://www.switchonthecode.com/tutorials
/javascript
-tutorial
-the
-scroll
-wheel
451 Dygraph
.cancelEvent
= function(e
) {
452 e
= e
? e
: window
.event
;
453 if (e
.stopPropagation
) {
456 if (e
.preventDefault
) {
459 e
.cancelBubble
= true;
461 e
.returnValue
= false;
466 * Generates interface elements for the Dygraph: a containing div, a div to
467 * display the current point, and a textbox to adjust the rolling average
468 * period. Also creates the Renderer/Layout elements.
471 Dygraph
.prototype.createInterface_
= function() {
472 // Create the all-enclosing graph div
473 var enclosing
= this.maindiv_
;
475 this.graphDiv
= document
.createElement("div");
476 this.graphDiv
.style
.width
= this.width_
+ "px";
477 this.graphDiv
.style
.height
= this.height_
+ "px";
478 enclosing
.appendChild(this.graphDiv
);
480 // Create the canvas for interactive parts of the chart.
481 this.canvas_
= Dygraph
.createCanvas();
482 this.canvas_
.style
.position
= "absolute";
483 this.canvas_
.width
= this.width_
;
484 this.canvas_
.height
= this.height_
;
485 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
486 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
488 // ... and for static parts of the chart.
489 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
491 // The interactive parts of the graph are drawn on top of the chart.
492 this.graphDiv
.appendChild(this.hidden_
);
493 this.graphDiv
.appendChild(this.canvas_
);
494 this.mouseEventElement_
= this.canvas_
;
497 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(e
) {
498 dygraph
.mouseMove_(e
);
500 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(e
) {
501 dygraph
.mouseOut_(e
);
504 // Create the grapher
505 // TODO(danvk): why does the Layout need its own set of options?
506 this.layoutOptions_
= { 'xOriginIsZero': false };
507 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
508 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
509 Dygraph
.update(this.layoutOptions_
, {
510 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) });
512 this.layout_
= new DygraphLayout(this, this.layoutOptions_
);
514 // TODO(danvk): why does the Renderer need its own set of options?
515 this.renderOptions_
= { colorScheme
: this.colors_
,
517 axisLineWidth
: Dygraph
.AXIS_LINE_WIDTH
};
518 Dygraph
.update(this.renderOptions_
, this.attrs_
);
519 Dygraph
.update(this.renderOptions_
, this.user_attrs_
);
521 this.createStatusMessage_();
522 this.createDragInterface_();
526 * Detach DOM elements in the dygraph and null out all data references.
527 * Calling this when you're done with a dygraph can dramatically reduce memory
528 * usage. See, e.g., the tests/perf.html example.
530 Dygraph
.prototype.destroy
= function() {
531 var removeRecursive
= function(node
) {
532 while (node
.hasChildNodes()) {
533 removeRecursive(node
.firstChild
);
534 node
.removeChild(node
.firstChild
);
537 removeRecursive(this.maindiv_
);
539 var nullOut
= function(obj
) {
541 if (typeof(obj
[n
]) === 'object') {
547 // These may not all be necessary, but it can't hurt...
548 nullOut(this.layout_
);
549 nullOut(this.plotter_
);
554 * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on
555 * this particular canvas. All Dygraph work is done on this.canvas_.
556 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
557 * @return {Object} The newly-created canvas
560 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
561 var h
= Dygraph
.createCanvas();
562 h
.style
.position
= "absolute";
563 // TODO(danvk): h should be offset from canvas. canvas needs to include
564 // some extra area to make it easier to zoom in on the far left and far
565 // right. h needs to be precisely the plot area, so that clipping occurs.
566 h
.style
.top
= canvas
.style
.top
;
567 h
.style
.left
= canvas
.style
.left
;
568 h
.width
= this.width_
;
569 h
.height
= this.height_
;
570 h
.style
.width
= this.width_
+ "px"; // for IE
571 h
.style
.height
= this.height_
+ "px"; // for IE
575 // Taken from MochiKit.Color
576 Dygraph
.hsvToRGB
= function (hue
, saturation
, value
) {
580 if (saturation
=== 0) {
585 var i
= Math
.floor(hue
* 6);
586 var f
= (hue
* 6) - i
;
587 var p
= value
* (1 - saturation
);
588 var q
= value
* (1 - (saturation
* f
));
589 var t
= value
* (1 - (saturation
* (1 - f
)));
591 case 1: red
= q
; green
= value
; blue
= p
; break;
592 case 2: red
= p
; green
= value
; blue
= t
; break;
593 case 3: red
= p
; green
= q
; blue
= value
; break;
594 case 4: red
= t
; green
= p
; blue
= value
; break;
595 case 5: red
= value
; green
= p
; blue
= q
; break;
596 case 6: // fall through
597 case 0: red
= value
; green
= t
; blue
= p
; break;
600 red
= Math
.floor(255 * red
+ 0.5);
601 green
= Math
.floor(255 * green
+ 0.5);
602 blue
= Math
.floor(255 * blue
+ 0.5);
603 return 'rgb(' + red
+ ',' + green
+ ',' + blue
+ ')';
608 * Generate a set of distinct colors for the data series. This is done with a
609 * color wheel. Saturation/Value are customizable, and the hue is
610 * equally-spaced around the color wheel. If a custom set of colors is
611 * specified, that is used instead.
614 Dygraph
.prototype.setColors_
= function() {
615 // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do
616 // away with this.renderOptions_.
617 var num
= this.attr_("labels").length
- 1;
619 var colors
= this.attr_('colors');
621 var sat
= this.attr_('colorSaturation') || 1.0;
622 var val
= this.attr_('colorValue') || 0.5;
623 var half
= Math
.ceil(num
/ 2);
624 for (var i
= 1; i
<= num
; i
++) {
625 if (!this.visibility()[i
-1]) continue;
626 // alternate colors for high contrast.
627 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
628 var hue
= (1.0 * idx
/ (1 + num
));
629 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
632 for (var i
= 0; i
< num
; i
++) {
633 if (!this.visibility()[i
]) continue;
634 var colorStr
= colors
[i
% colors
.length
];
635 this.colors_
.push(colorStr
);
639 // TODO(danvk): update this w/r
/t/ the
new options system
.
640 this.renderOptions_
.colorScheme
= this.colors_
;
641 Dygraph
.update(this.plotter_
.options
, this.renderOptions_
);
642 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
643 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
647 * Return the list of colors. This is either the list of colors passed in the
648 * attributes, or the autogenerated list of rgb(r,g,b) strings.
649 * @return {Array<string>} The list of colors.
651 Dygraph
.prototype.getColors
= function() {
655 // The following functions are from quirksmode.org with a modification for Safari from
656 // http://blog.firetree.net/2005/07/04/javascript-find-position/
657 // http://www.quirksmode.org/js
/findpos
.html
658 Dygraph
.findPosX
= function(obj
) {
663 curleft
+= obj
.offsetLeft
;
664 if(!obj
.offsetParent
)
666 obj
= obj
.offsetParent
;
673 Dygraph
.findPosY
= function(obj
) {
678 curtop
+= obj
.offsetTop
;
679 if(!obj
.offsetParent
)
681 obj
= obj
.offsetParent
;
691 * Create the div that contains information on the selected point(s)
692 * This goes in the top right of the canvas, unless an external div has already
696 Dygraph
.prototype.createStatusMessage_
= function() {
697 var userLabelsDiv
= this.user_attrs_
["labelsDiv"];
698 if (userLabelsDiv
&& null != userLabelsDiv
699 && (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
700 this.user_attrs_
["labelsDiv"] = document
.getElementById(userLabelsDiv
);
702 if (!this.attr_("labelsDiv")) {
703 var divWidth
= this.attr_('labelsDivWidth');
705 "position": "absolute",
708 "width": divWidth
+ "px",
710 "left": (this.width_
- divWidth
- 2) + "px",
711 "background": "white",
713 "overflow": "hidden"};
714 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
715 var div
= document
.createElement("div");
716 for (var name
in messagestyle
) {
717 if (messagestyle
.hasOwnProperty(name
)) {
718 div
.style
[name
] = messagestyle
[name
];
721 this.graphDiv
.appendChild(div
);
722 this.attrs_
.labelsDiv
= div
;
727 * Position the labels div so that its right edge is flush with the right edge
728 * of the charting area.
730 Dygraph
.prototype.positionLabelsDiv_
= function() {
731 // Don't touch a user-specified labelsDiv.
732 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
734 var area
= this.plotter_
.area
;
735 var div
= this.attr_("labelsDiv");
736 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
740 * Create the text box to adjust the averaging period
743 Dygraph
.prototype.createRollInterface_
= function() {
744 // Create a roller if one doesn't exist already.
746 this.roller_
= document
.createElement("input");
747 this.roller_
.type
= "text";
748 this.roller_
.style
.display
= "none";
749 this.graphDiv
.appendChild(this.roller_
);
752 var display
= this.attr_('showRoller') ? 'block' : 'none';
754 var textAttr
= { "position": "absolute",
756 "top": (this.plotter_
.area
.h
- 25) + "px",
757 "left": (this.plotter_
.area
.x
+ 1) + "px",
760 this.roller_
.size
= "2";
761 this.roller_
.value
= this.rollPeriod_
;
762 for (var name
in textAttr
) {
763 if (textAttr
.hasOwnProperty(name
)) {
764 this.roller_
.style
[name
] = textAttr
[name
];
769 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
772 // These functions are taken from MochiKit.Signal
773 Dygraph
.pageX
= function(e
) {
775 return (!e
.pageX
|| e
.pageX
< 0) ? 0 : e
.pageX
;
778 var b
= document
.body
;
780 (de
.scrollLeft
|| b
.scrollLeft
) -
781 (de
.clientLeft
|| 0);
785 Dygraph
.pageY
= function(e
) {
787 return (!e
.pageY
|| e
.pageY
< 0) ? 0 : e
.pageY
;
790 var b
= document
.body
;
792 (de
.scrollTop
|| b
.scrollTop
) -
797 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
798 return Dygraph
.pageX(e
) - context
.px
801 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
802 return Dygraph
.pageY(e
) - context
.py
805 // Called in response to an interaction model operation that
806 // should start the default panning behavior.
808 // It's used in the default callback for "mousedown" operations.
809 // Custom interaction model builders can use it to provide the default
812 Dygraph
.startPan
= function(event
, g
, context
) {
813 // have to be zoomed in to pan.
814 // TODO(konigsberg): Let's loosen this zoom-to-pan restriction, also
815 // perhaps create panning boundaries? A more flexible pan would make it,
816 // ahem, 'pan-useful'.
818 for (var i
= 0; i
< g
.axes_
.length
; i
++) {
819 if (g
.axes_
[i
].valueWindow
|| g
.axes_
[i
].valueRange
) {
824 if (!g
.dateWindow_
&& !zoomedY
) return;
826 context
.isPanning
= true;
827 var xRange
= g
.xAxisRange();
828 context
.dateRange
= xRange
[1] - xRange
[0];
830 // Record the range of each y-axis at the start of the drag.
831 // If any axis has a valueRange or valueWindow, then we want a 2D pan.
832 context
.is2DPan
= false;
833 for (var i
= 0; i
< g
.axes_
.length
; i
++) {
834 var axis
= g
.axes_
[i
];
835 var yRange
= g
.yAxisRange(i
);
836 axis
.dragValueRange
= yRange
[1] - yRange
[0];
837 var r
= g
.toDataCoords(null, context
.dragStartY
, i
);
838 axis
.draggingValue
= r
[1];
839 if (axis
.valueWindow
|| axis
.valueRange
) context
.is2DPan
= true;
842 // TODO(konigsberg): Switch from all this math to toDataCoords?
843 // Seems to work for the dragging value.
844 context
.draggingDate
= (context
.dragStartX
/ g
.width_
) * context
.dateRange
+ xRange
[0];
847 // Called in response to an interaction model operation that
848 // responds to an event that pans the view.
850 // It's used in the default callback for "mousemove" operations.
851 // Custom interaction model builders can use it to provide the default
854 Dygraph
.movePan
= function(event
, g
, context
) {
855 context
.dragEndX
= g
.dragGetX_(event
, context
);
856 context
.dragEndY
= g
.dragGetY_(event
, context
);
858 // TODO(danvk): update this comment
859 // Want to have it so that:
860 // 1. draggingDate appears at dragEndX, draggingValue appears at dragEndY.
861 // 2. daterange = (dateWindow_[1] - dateWindow_[0]) is unaltered.
862 // 3. draggingValue appears at dragEndY.
863 // 4. valueRange is unaltered.
865 var minDate
= context
.draggingDate
- (context
.dragEndX
/ g
.width_
) * context
.dateRange
;
866 var maxDate
= minDate
+ context
.dateRange
;
867 g
.dateWindow_
= [minDate
, maxDate
];
869 // y-axis scaling is automatic unless this is a full 2D pan.
870 if (context
.is2DPan
) {
871 // Adjust each axis appropriately.
872 var y_frac
= context
.dragEndY
/ g
.height_
;
873 for (var i
= 0; i
< g
.axes_
.length
; i
++) {
874 var axis
= g
.axes_
[i
];
875 var maxValue
= axis
.draggingValue
+ y_frac
* axis
.dragValueRange
;
876 var minValue
= maxValue
- axis
.dragValueRange
;
877 axis
.valueWindow
= [ minValue
, maxValue
];
884 // Called in response to an interaction model operation that
885 // responds to an event that ends panning.
887 // It's used in the default callback for "mouseup" operations.
888 // Custom interaction model builders can use it to provide the default
891 Dygraph
.endPan
= function(event
, g
, context
) {
892 context
.isPanning
= false;
893 context
.is2DPan
= false;
894 context
.draggingDate
= null;
895 context
.dateRange
= null;
896 context
.valueRange
= null;
899 // Called in response to an interaction model operation that
900 // responds to an event that starts zooming.
902 // It's used in the default callback for "mousedown" operations.
903 // Custom interaction model builders can use it to provide the default
906 Dygraph
.startZoom
= function(event
, g
, context
) {
907 context
.isZooming
= true;
910 // Called in response to an interaction model operation that
911 // responds to an event that defines zoom boundaries.
913 // It's used in the default callback for "mousemove" operations.
914 // Custom interaction model builders can use it to provide the default
917 Dygraph
.moveZoom
= function(event
, g
, context
) {
918 context
.dragEndX
= g
.dragGetX_(event
, context
);
919 context
.dragEndY
= g
.dragGetY_(event
, context
);
921 var xDelta
= Math
.abs(context
.dragStartX
- context
.dragEndX
);
922 var yDelta
= Math
.abs(context
.dragStartY
- context
.dragEndY
);
924 // drag direction threshold for y axis is twice as large as x axis
925 context
.dragDirection
= (xDelta
< yDelta
/ 2) ? Dygraph
.VERTICAL
: Dygraph
.HORIZONTAL
;
928 context
.dragDirection
,
933 context
.prevDragDirection
,
937 context
.prevEndX
= context
.dragEndX
;
938 context
.prevEndY
= context
.dragEndY
;
939 context
.prevDragDirection
= context
.dragDirection
;
942 // Called in response to an interaction model operation that
943 // responds to an event that performs a zoom based on previously defined
946 // It's used in the default callback for "mouseup" operations.
947 // Custom interaction model builders can use it to provide the default
950 Dygraph
.endZoom
= function(event
, g
, context
) {
951 context
.isZooming
= false;
952 context
.dragEndX
= g
.dragGetX_(event
, context
);
953 context
.dragEndY
= g
.dragGetY_(event
, context
);
954 var regionWidth
= Math
.abs(context
.dragEndX
- context
.dragStartX
);
955 var regionHeight
= Math
.abs(context
.dragEndY
- context
.dragStartY
);
957 if (regionWidth
< 2 && regionHeight
< 2 &&
958 g
.lastx_
!= undefined
&& g
.lastx_
!= -1) {
959 // TODO(danvk): pass along more info about the points, e.g. 'x'
960 if (g
.attr_('clickCallback') != null) {
961 g
.attr_('clickCallback')(event
, g
.lastx_
, g
.selPoints_
);
963 if (g
.attr_('pointClickCallback')) {
964 // check if the click was on a particular point.
966 var closestDistance
= 0;
967 for (var i
= 0; i
< g
.selPoints_
.length
; i
++) {
968 var p
= g
.selPoints_
[i
];
969 var distance
= Math
.pow(p
.canvasx
- context
.dragEndX
, 2) +
970 Math
.pow(p
.canvasy
- context
.dragEndY
, 2);
971 if (closestIdx
== -1 || distance
< closestDistance
) {
972 closestDistance
= distance
;
977 // Allow any click within two pixels of the dot.
978 var radius
= g
.attr_('highlightCircleSize') + 2;
979 if (closestDistance
<= 5 * 5) {
980 g
.attr_('pointClickCallback')(event
, g
.selPoints_
[closestIdx
]);
985 if (regionWidth
>= 10 && context
.dragDirection
== Dygraph
.HORIZONTAL
) {
986 g
.doZoomX_(Math
.min(context
.dragStartX
, context
.dragEndX
),
987 Math
.max(context
.dragStartX
, context
.dragEndX
));
988 } else if (regionHeight
>= 10 && context
.dragDirection
== Dygraph
.VERTICAL
) {
989 g
.doZoomY_(Math
.min(context
.dragStartY
, context
.dragEndY
),
990 Math
.max(context
.dragStartY
, context
.dragEndY
));
992 g
.canvas_
.getContext("2d").clearRect(0, 0,
996 context
.dragStartX
= null;
997 context
.dragStartY
= null;
1000 Dygraph
.defaultInteractionModel
= {
1001 // Track the beginning of drag events
1002 mousedown
: function(event
, g
, context
) {
1003 context
.initializeMouseDown(event
, g
, context
);
1005 if (event
.altKey
|| event
.shiftKey
) {
1006 Dygraph
.startPan(event
, g
, context
);
1008 Dygraph
.startZoom(event
, g
, context
);
1012 // Draw zoom rectangles when the mouse is down and the user moves around
1013 mousemove
: function(event
, g
, context
) {
1014 if (context
.isZooming
) {
1015 Dygraph
.moveZoom(event
, g
, context
);
1016 } else if (context
.isPanning
) {
1017 Dygraph
.movePan(event
, g
, context
);
1021 mouseup
: function(event
, g
, context
) {
1022 if (context
.isZooming
) {
1023 Dygraph
.endZoom(event
, g
, context
);
1024 } else if (context
.isPanning
) {
1025 Dygraph
.endPan(event
, g
, context
);
1029 // Temporarily cancel the dragging event when the mouse leaves the graph
1030 mouseout
: function(event
, g
, context
) {
1031 if (context
.isZooming
) {
1032 context
.dragEndX
= null;
1033 context
.dragEndY
= null;
1037 // Disable zooming out if panning.
1038 dblclick
: function(event
, g
, context
) {
1039 if (event
.altKey
|| event
.shiftKey
) {
1042 // TODO(konigsberg): replace g.doUnzoom()_ with something that is
1043 // friendlier to public use.
1048 Dygraph
.DEFAULT_ATTRS
.interactionModel
= Dygraph
.defaultInteractionModel
;
1051 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1055 Dygraph
.prototype.createDragInterface_
= function() {
1057 // Tracks whether the mouse is down right now
1059 isPanning
: false, // is this drag part of a pan?
1060 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1065 dragDirection
: null,
1068 prevDragDirection
: null,
1070 // TODO(danvk): update this comment
1071 // draggingDate and draggingValue represent the [date,value] point on the
1072 // graph at which the mouse was pressed. As the mouse moves while panning,
1073 // the viewport must pan so that the mouse position points to
1074 // [draggingDate, draggingValue]
1077 // TODO(danvk): update this comment
1078 // The range in second/value units that the viewport encompasses during a
1079 // panning operation.
1082 // Utility function to convert page-wide coordinates to canvas coords
1086 initializeMouseDown
: function(event
, g
, context
) {
1087 // prevents mouse drags from selecting page text.
1088 if (event
.preventDefault
) {
1089 event
.preventDefault(); // Firefox, Chrome, etc.
1091 event
.returnValue
= false; // IE
1092 event
.cancelBubble
= true;
1095 context
.px
= Dygraph
.findPosX(g
.canvas_
);
1096 context
.py
= Dygraph
.findPosY(g
.canvas_
);
1097 context
.dragStartX
= g
.dragGetX_(event
, context
);
1098 context
.dragStartY
= g
.dragGetY_(event
, context
);
1102 var interactionModel
= this.attr_("interactionModel");
1104 // Self is the graph.
1107 // Function that binds the graph and context to the handler.
1108 var bindHandler
= function(handler
) {
1109 return function(event
) {
1110 handler(event
, self
, context
);
1114 for (var eventName
in interactionModel
) {
1115 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1116 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
1117 bindHandler(interactionModel
[eventName
]));
1120 // If the user releases the mouse button during a drag, but not over the
1121 // canvas, then it doesn't count as a zooming action.
1122 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
1123 if (context
.isZooming
|| context
.isPanning
) {
1124 context
.isZooming
= false;
1125 context
.dragStartX
= null;
1126 context
.dragStartY
= null;
1129 if (context
.isPanning
) {
1130 context
.isPanning
= false;
1131 context
.draggingDate
= null;
1132 context
.dateRange
= null;
1133 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1134 delete self
.axes_
[i
].draggingValue
;
1135 delete self
.axes_
[i
].dragValueRange
;
1142 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1143 * up any previous zoom rectangles that were drawn. This could be optimized to
1144 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1147 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1148 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1149 * @param {Number} startX The X position where the drag started, in canvas
1151 * @param {Number} endX The current X position of the drag, in canvas coords.
1152 * @param {Number} startY The Y position where the drag started, in canvas
1154 * @param {Number} endY The current Y position of the drag, in canvas coords.
1155 * @param {Number} prevDirection the value of direction on the previous call to
1156 * this function. Used to avoid excess redrawing
1157 * @param {Number} prevEndX The value of endX on the previous call to this
1158 * function. Used to avoid excess redrawing
1159 * @param {Number} prevEndY The value of endY on the previous call to this
1160 * function. Used to avoid excess redrawing
1163 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
, endY
,
1164 prevDirection
, prevEndX
, prevEndY
) {
1165 var ctx
= this.canvas_
.getContext("2d");
1167 // Clean up from the previous rect if necessary
1168 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1169 ctx
.clearRect(Math
.min(startX
, prevEndX
), 0,
1170 Math
.abs(startX
- prevEndX
), this.height_
);
1171 } else if (prevDirection
== Dygraph
.VERTICAL
){
1172 ctx
.clearRect(0, Math
.min(startY
, prevEndY
),
1173 this.width_
, Math
.abs(startY
- prevEndY
));
1176 // Draw a light-grey rectangle to show the new viewing area
1177 if (direction
== Dygraph
.HORIZONTAL
) {
1178 if (endX
&& startX
) {
1179 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1180 ctx
.fillRect(Math
.min(startX
, endX
), 0,
1181 Math
.abs(endX
- startX
), this.height_
);
1184 if (direction
== Dygraph
.VERTICAL
) {
1185 if (endY
&& startY
) {
1186 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1187 ctx
.fillRect(0, Math
.min(startY
, endY
),
1188 this.width_
, Math
.abs(endY
- startY
));
1194 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1195 * the canvas. The exact zoom window may be slightly larger if there are no data
1196 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1197 * which accepts dates that match the raw data. This function redraws the graph.
1199 * @param {Number} lowX The leftmost pixel value that should be visible.
1200 * @param {Number} highX The rightmost pixel value that should be visible.
1203 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1204 // Find the earliest and latest dates contained in this canvasx range.
1205 // Convert the call to date ranges of the raw data.
1206 var r
= this.toDataCoords(lowX
, null);
1208 r
= this.toDataCoords(highX
, null);
1210 this.doZoomXDates_(minDate
, maxDate
);
1214 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1215 * method with doZoomX which accepts pixel coordinates. This function redraws
1218 * @param {Number} minDate The minimum date that should be visible.
1219 * @param {Number} maxDate The maximum date that should be visible.
1222 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1223 this.dateWindow_
= [minDate
, maxDate
];
1224 this.zoomed_x_
= true;
1226 if (this.attr_("zoomCallback")) {
1227 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1232 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1233 * the canvas. This function redraws the graph.
1235 * @param {Number} lowY The topmost pixel value that should be visible.
1236 * @param {Number} highY The lowest pixel value that should be visible.
1239 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1240 // Find the highest and lowest values in pixel range for each axis.
1241 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1242 // This is because pixels increase as you go down on the screen, whereas data
1243 // coordinates increase as you go up the screen.
1244 var valueRanges
= [];
1245 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1246 var hi
= this.toDataCoords(null, lowY
, i
);
1247 var low
= this.toDataCoords(null, highY
, i
);
1248 this.axes_
[i
].valueWindow
= [low
[1], hi
[1]];
1249 valueRanges
.push([low
[1], hi
[1]]);
1252 this.zoomed_y_
= true;
1254 if (this.attr_("zoomCallback")) {
1255 var xRange
= this.xAxisRange();
1256 var yRange
= this.yAxisRange();
1257 this.attr_("zoomCallback")(xRange
[0], xRange
[1], yRange
[0], yRange
[1]);
1262 * Reset the zoom to the original view coordinates. This is the same as
1263 * double-clicking on the graph.
1267 Dygraph
.prototype.doUnzoom_
= function() {
1269 if (this.dateWindow_
!= null) {
1271 this.dateWindow_
= null;
1274 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1275 if (this.axes_
[i
].valueWindow
!= null) {
1277 delete this.axes_
[i
].valueWindow
;
1282 // Putting the drawing operation before the callback because it resets
1284 this.zoomed_x_
= false;
1285 this.zoomed_y_
= false;
1287 if (this.attr_("zoomCallback")) {
1288 var minDate
= this.rawData_
[0][0];
1289 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1290 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1296 * When the mouse moves in the canvas, display information about a nearby data
1297 * point and draw dots over those points in the data series. This function
1298 * takes care of cleanup of previously-drawn dots.
1299 * @param {Object} event The mousemove event from the browser.
1302 Dygraph
.prototype.mouseMove_
= function(event
) {
1303 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1304 var points
= this.layout_
.points
;
1309 // Loop through all the points and find the date nearest to our current
1311 var minDist
= 1e+100;
1313 for (var i
= 0; i
< points
.length
; i
++) {
1314 var point
= points
[i
];
1315 if (point
== null) continue;
1316 var dist
= Math
.abs(point
.canvasx
- canvasx
);
1317 if (dist
> minDist
) continue;
1321 if (idx
>= 0) lastx
= points
[idx
].xval
;
1322 // Check that you can really highlight the last day's data
1323 var last
= points
[points
.length
-1];
1324 if (last
!= null && canvasx
> last
.canvasx
)
1325 lastx
= points
[points
.length
-1].xval
;
1327 // Extract the points we've selected
1328 this.selPoints_
= [];
1329 var l
= points
.length
;
1330 if (!this.attr_("stackedGraph")) {
1331 for (var i
= 0; i
< l
; i
++) {
1332 if (points
[i
].xval
== lastx
) {
1333 this.selPoints_
.push(points
[i
]);
1337 // Need to 'unstack' points starting from the bottom
1338 var cumulative_sum
= 0;
1339 for (var i
= l
- 1; i
>= 0; i
--) {
1340 if (points
[i
].xval
== lastx
) {
1341 var p
= {}; // Clone the point since we modify it
1342 for (var k
in points
[i
]) {
1343 p
[k
] = points
[i
][k
];
1345 p
.yval
-= cumulative_sum
;
1346 cumulative_sum
+= p
.yval
;
1347 this.selPoints_
.push(p
);
1350 this.selPoints_
.reverse();
1353 if (this.attr_("highlightCallback")) {
1354 var px
= this.lastx_
;
1355 if (px
!== null && lastx
!= px
) {
1356 // only fire if the selected point has changed.
1357 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
, this.idxToRow_(idx
));
1361 // Save last x position for callbacks.
1362 this.lastx_
= lastx
;
1364 this.updateSelection_();
1368 * Transforms layout_.points index into data row number.
1369 * @param int layout_.points index
1370 * @return int row number, or -1 if none could be found.
1373 Dygraph
.prototype.idxToRow_
= function(idx
) {
1374 if (idx
< 0) return -1;
1376 for (var i
in this.layout_
.datasets
) {
1377 if (idx
< this.layout_
.datasets
[i
].length
) {
1378 return this.boundaryIds_
[0][0]+idx
;
1380 idx
-= this.layout_
.datasets
[i
].length
;
1386 * Draw dots over the selectied points in the data series. This function
1387 * takes care of cleanup of previously-drawn dots.
1390 Dygraph
.prototype.updateSelection_
= function() {
1391 // Clear the previously drawn vertical, if there is one
1392 var ctx
= this.canvas_
.getContext("2d");
1393 if (this.previousVerticalX_
>= 0) {
1394 // Determine the maximum highlight circle size.
1395 var maxCircleSize
= 0;
1396 var labels
= this.attr_('labels');
1397 for (var i
= 1; i
< labels
.length
; i
++) {
1398 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1399 if (r
> maxCircleSize
) maxCircleSize
= r
;
1401 var px
= this.previousVerticalX_
;
1402 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1403 2 * maxCircleSize
+ 2, this.height_
);
1406 var isOK
= function(x
) { return x
&& !isNaN(x
); };
1408 if (this.selPoints_
.length
> 0) {
1409 var canvasx
= this.selPoints_
[0].canvasx
;
1411 // Set the status message to indicate the selected point(s)
1412 var replace
= this.attr_('xValueFormatter')(this.lastx_
, this) + ":";
1413 var fmtFunc
= this.attr_('yValueFormatter');
1414 var clen
= this.colors_
.length
;
1416 if (this.attr_('showLabelsOnHighlight')) {
1417 // Set the status message to indicate the selected point(s)
1418 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1419 if (!this.attr_("labelsShowZeroValues") && this.selPoints_
[i
].yval
== 0) continue;
1420 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1421 if (this.attr_("labelsSeparateLines")) {
1424 var point
= this.selPoints_
[i
];
1425 var c
= new RGBColor(this.plotter_
.colors
[point
.name
]);
1426 var yval
= fmtFunc(point
.yval
);
1427 replace
+= " <b><font color='" + c
.toHex() + "'>"
1428 + point
.name
+ "</font></b>:"
1432 this.attr_("labelsDiv").innerHTML
= replace
;
1435 // Draw colored circles over the center of each selected point
1437 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1438 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1440 this.attr_('highlightCircleSize', this.selPoints_
[i
].name
);
1442 ctx
.fillStyle
= this.plotter_
.colors
[this.selPoints_
[i
].name
];
1443 ctx
.arc(canvasx
, this.selPoints_
[i
].canvasy
, circleSize
,
1444 0, 2 * Math
.PI
, false);
1449 this.previousVerticalX_
= canvasx
;
1454 * Set manually set selected dots, and display information about them
1455 * @param int row number that should by highlighted
1456 * false value clears the selection
1459 Dygraph
.prototype.setSelection
= function(row
) {
1460 // Extract the points we've selected
1461 this.selPoints_
= [];
1464 if (row
!== false) {
1465 row
= row
-this.boundaryIds_
[0][0];
1468 if (row
!== false && row
>= 0) {
1469 for (var i
in this.layout_
.datasets
) {
1470 if (row
< this.layout_
.datasets
[i
].length
) {
1471 var point
= this.layout_
.points
[pos
+row
];
1473 if (this.attr_("stackedGraph")) {
1474 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1477 this.selPoints_
.push(point
);
1479 pos
+= this.layout_
.datasets
[i
].length
;
1483 if (this.selPoints_
.length
) {
1484 this.lastx_
= this.selPoints_
[0].xval
;
1485 this.updateSelection_();
1488 this.clearSelection();
1494 * The mouse has left the canvas. Clear out whatever artifacts remain
1495 * @param {Object} event the mouseout event from the browser.
1498 Dygraph
.prototype.mouseOut_
= function(event
) {
1499 if (this.attr_("unhighlightCallback")) {
1500 this.attr_("unhighlightCallback")(event
);
1503 if (this.attr_("hideOverlayOnMouseOut")) {
1504 this.clearSelection();
1509 * Remove all selection from the canvas
1512 Dygraph
.prototype.clearSelection
= function() {
1513 // Get rid of the overlay data
1514 var ctx
= this.canvas_
.getContext("2d");
1515 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1516 this.attr_("labelsDiv").innerHTML
= "";
1517 this.selPoints_
= [];
1522 * Returns the number of the currently selected row
1523 * @return int row number, of -1 if nothing is selected
1526 Dygraph
.prototype.getSelection
= function() {
1527 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1531 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1532 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1533 return row
+ this.boundaryIds_
[0][0];
1539 Dygraph
.zeropad
= function(x
) {
1540 if (x
< 10) return "0" + x
; else return "" + x
;
1544 * Return a string version of the hours, minutes and seconds portion of a date.
1545 * @param {Number} date The JavaScript date (ms since epoch)
1546 * @return {String} A time of the form "HH:MM:SS"
1549 Dygraph
.hmsString_
= function(date
) {
1550 var zeropad
= Dygraph
.zeropad
;
1551 var d
= new Date(date
);
1552 if (d
.getSeconds()) {
1553 return zeropad(d
.getHours()) + ":" +
1554 zeropad(d
.getMinutes()) + ":" +
1555 zeropad(d
.getSeconds());
1557 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
1562 * Convert a JS date to a string appropriate to display on an axis that
1563 * is displaying values at the stated granularity.
1564 * @param {Date} date The date to format
1565 * @param {Number} granularity One of the Dygraph granularity constants
1566 * @return {String} The formatted date
1569 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1570 if (granularity
>= Dygraph
.DECADAL
) {
1571 return date
.strftime('%Y');
1572 } else if (granularity
>= Dygraph
.MONTHLY
) {
1573 return date
.strftime('%b %y');
1575 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1576 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1577 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1579 return Dygraph
.hmsString_(date
.getTime());
1585 * Convert a JS date (millis since epoch) to YYYY/MM/DD
1586 * @param {Number} date The JavaScript date (ms since epoch)
1587 * @return {String} A date of the form "YYYY/MM/DD"
1590 Dygraph
.dateString_
= function(date
, self
) {
1591 var zeropad
= Dygraph
.zeropad
;
1592 var d
= new Date(date
);
1595 var year
= "" + d
.getFullYear();
1596 // Get a 0 padded month string
1597 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
1598 // Get a 0 padded day string
1599 var day
= zeropad(d
.getDate());
1602 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1603 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
1605 return year
+ "/" + month + "/" + day
+ ret
;
1609 * Round a number to the specified number of digits past the decimal point.
1610 * @param {Number} num The number to round
1611 * @param {Number} places The number of decimals to which to round
1612 * @return {Number} The rounded number
1615 Dygraph
.round_
= function(num
, places
) {
1616 var shift
= Math
.pow(10, places
);
1617 return Math
.round(num
* shift
)/shift
;
1621 * Fires when there's data available to be graphed.
1622 * @param {String} data Raw CSV data to be plotted
1625 Dygraph
.prototype.loadedEvent_
= function(data
) {
1626 this.rawData_
= this.parseCSV_(data
);
1630 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1631 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1632 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1635 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1638 Dygraph
.prototype.addXTicks_
= function() {
1639 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1640 var startDate
, endDate
;
1641 if (this.dateWindow_
) {
1642 startDate
= this.dateWindow_
[0];
1643 endDate
= this.dateWindow_
[1];
1645 startDate
= this.rawData_
[0][0];
1646 endDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1649 var xTicks
= this.attr_('xTicker')(startDate
, endDate
, this);
1650 this.layout_
.updateOptions({xTicks
: xTicks
});
1653 // Time granularity enumeration
1654 Dygraph
.SECONDLY
= 0;
1655 Dygraph
.TWO_SECONDLY
= 1;
1656 Dygraph
.FIVE_SECONDLY
= 2;
1657 Dygraph
.TEN_SECONDLY
= 3;
1658 Dygraph
.THIRTY_SECONDLY
= 4;
1659 Dygraph
.MINUTELY
= 5;
1660 Dygraph
.TWO_MINUTELY
= 6;
1661 Dygraph
.FIVE_MINUTELY
= 7;
1662 Dygraph
.TEN_MINUTELY
= 8;
1663 Dygraph
.THIRTY_MINUTELY
= 9;
1664 Dygraph
.HOURLY
= 10;
1665 Dygraph
.TWO_HOURLY
= 11;
1666 Dygraph
.SIX_HOURLY
= 12;
1668 Dygraph
.WEEKLY
= 14;
1669 Dygraph
.MONTHLY
= 15;
1670 Dygraph
.QUARTERLY
= 16;
1671 Dygraph
.BIANNUAL
= 17;
1672 Dygraph
.ANNUAL
= 18;
1673 Dygraph
.DECADAL
= 19;
1674 Dygraph
.CENTENNIAL
= 20;
1675 Dygraph
.NUM_GRANULARITIES
= 21;
1677 Dygraph
.SHORT_SPACINGS
= [];
1678 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1679 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1680 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1681 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1682 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1683 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1684 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1685 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1686 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1687 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1688 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1689 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1690 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1691 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1692 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1696 // If we used this time granularity, how many ticks would there be?
1697 // This is only an approximation, but it's generally good enough.
1699 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1700 if (granularity
< Dygraph
.MONTHLY
) {
1701 // Generate one tick mark for every fixed interval of time.
1702 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1703 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1705 var year_mod
= 1; // e.g. to only print one point every 10 years.
1706 var num_months
= 12;
1707 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1708 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1709 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1710 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1711 if (granularity
== Dygraph
.CENTENNIAL
) { num_months
= 1; year_mod
= 100; }
1713 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1714 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1715 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1721 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1722 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1724 // Returns an array containing {v: millis, label: label} dictionaries.
1726 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1727 var formatter
= this.attr_("xAxisLabelFormatter");
1729 if (granularity
< Dygraph
.MONTHLY
) {
1730 // Generate one tick mark for every fixed interval of time.
1731 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1732 var format
= '%d%b'; // e.g. "1Jan"
1734 // Find a time less than start_time which occurs on a "nice" time boundary
1735 // for this granularity.
1736 var g
= spacing
/ 1000;
1737 var d
= new Date(start_time
);
1738 if (g
<= 60) { // seconds
1739 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1743 if (g
<= 60) { // minutes
1744 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1749 if (g
<= 24) { // days
1750 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1755 if (g
== 7) { // one week
1756 d
.setDate(d
.getDate() - d
.getDay());
1761 start_time
= d
.getTime();
1763 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1764 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1767 // Display a tick mark on the first of a set of months of each year.
1768 // Years get a tick mark iff y % year_mod == 0. This is useful for
1769 // displaying a tick mark once every 10 years, say, on long time scales.
1771 var year_mod
= 1; // e.g. to only print one point every 10 years.
1773 if (granularity
== Dygraph
.MONTHLY
) {
1774 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1775 } else if (granularity
== Dygraph
.QUARTERLY
) {
1776 months
= [ 0, 3, 6, 9 ];
1777 } else if (granularity
== Dygraph
.BIANNUAL
) {
1779 } else if (granularity
== Dygraph
.ANNUAL
) {
1781 } else if (granularity
== Dygraph
.DECADAL
) {
1784 } else if (granularity
== Dygraph
.CENTENNIAL
) {
1788 this.warn("Span of dates is too long");
1791 var start_year
= new Date(start_time
).getFullYear();
1792 var end_year
= new Date(end_time
).getFullYear();
1793 var zeropad
= Dygraph
.zeropad
;
1794 for (var i
= start_year
; i
<= end_year
; i
++) {
1795 if (i
% year_mod
!= 0) continue;
1796 for (var j
= 0; j
< months
.length
; j
++) {
1797 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1798 var t
= Date
.parse(date_str
);
1799 if (t
< start_time
|| t
> end_time
) continue;
1800 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1810 * Add ticks to the x-axis based on a date range.
1811 * @param {Number} startDate Start of the date window (millis since epoch)
1812 * @param {Number} endDate End of the date window (millis since epoch)
1813 * @return {Array.<Object>} Array of {label, value} tuples.
1816 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1818 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1819 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1820 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1827 return self
.GetXAxis(startDate
, endDate
, chosen
);
1829 // TODO(danvk): signal error.
1834 * Add ticks when the x axis has numbers on it (instead of dates)
1835 * @param {Number} startDate Start of the date window (millis since epoch)
1836 * @param {Number} endDate End of the date window (millis since epoch)
1838 * @param {function} attribute accessor function.
1839 * @return {Array.<Object>} Array of {label, value} tuples.
1842 Dygraph
.numericTicks
= function(minV
, maxV
, self
, axis_props
, vals
) {
1843 var attr
= function(k
) {
1844 if (axis_props
&& axis_props
.hasOwnProperty(k
)) return axis_props
[k
];
1845 return self
.attr_(k
);
1850 for (var i
= 0; i
< vals
.length
; i
++) {
1851 ticks
.push({v
: vals
[i
]});
1855 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1856 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1857 // The first spacing greater than pixelsPerYLabel is what we use.
1858 // TODO(danvk): version that works on a log scale.
1859 if (attr("labelsKMG2")) {
1860 var mults
= [1, 2, 4, 8];
1862 var mults
= [1, 2, 5];
1864 var scale
, low_val
, high_val
, nTicks
;
1865 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1866 var pixelsPerTick
= attr('pixelsPerYLabel');
1867 for (var i
= -10; i
< 50; i
++) {
1868 if (attr("labelsKMG2")) {
1869 var base_scale
= Math
.pow(16, i
);
1871 var base_scale
= Math
.pow(10, i
);
1873 for (var j
= 0; j
< mults
.length
; j
++) {
1874 scale
= base_scale
* mults
[j
];
1875 low_val
= Math
.floor(minV
/ scale
) * scale
;
1876 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1877 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
1878 var spacing
= self
.height_
/ nTicks
;
1879 // wish I could break out of both loops at once...
1880 if (spacing
> pixelsPerTick
) break;
1882 if (spacing
> pixelsPerTick
) break;
1885 // Construct the set of ticks.
1886 // Allow reverse y-axis if it's explicitly requested.
1887 if (low_val
> high_val
) scale
*= -1;
1888 for (var i
= 0; i
< nTicks
; i
++) {
1889 var tickV
= low_val
+ i
* scale
;
1890 ticks
.push( {v
: tickV
} );
1894 // Add formatted labels to the ticks.
1897 if (attr("labelsKMB")) {
1899 k_labels
= [ "K", "M", "B", "T" ];
1901 if (attr("labelsKMG2")) {
1902 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1904 k_labels
= [ "k", "M", "G", "T" ];
1906 var formatter
= attr('yAxisLabelFormatter') ? attr('yAxisLabelFormatter') : attr('yValueFormatter');
1908 for (var i
= 0; i
< ticks
.length
; i
++) {
1909 var tickV
= ticks
[i
].v
;
1910 var absTickV
= Math
.abs(tickV
);
1912 if (formatter
!= undefined
) {
1913 label
= formatter(tickV
);
1915 label
= Dygraph
.round_(tickV
, 2);
1917 if (k_labels
.length
) {
1918 // Round up to an appropriate unit.
1920 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
1921 if (absTickV
>= n
) {
1922 label
= Dygraph
.round_(tickV
/ n
, 1) + k_labels
[j
];
1927 ticks
[i
].label
= label
;
1932 // Computes the range of the data series (including confidence intervals).
1933 // series is either [ [x1, y1], [x2, y2], ... ] or
1934 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1935 // Returns [low, high]
1936 Dygraph
.prototype.extremeValues_
= function(series
) {
1937 var minY
= null, maxY
= null;
1939 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1941 // With custom bars, maxY is the max of the high values.
1942 for (var j
= 0; j
< series
.length
; j
++) {
1943 var y
= series
[j
][1][0];
1945 var low
= y
- series
[j
][1][1];
1946 var high
= y
+ series
[j
][1][2];
1947 if (low
> y
) low
= y
; // this can happen with custom bars,
1948 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1949 if (maxY
== null || high
> maxY
) {
1952 if (minY
== null || low
< minY
) {
1957 for (var j
= 0; j
< series
.length
; j
++) {
1958 var y
= series
[j
][1];
1959 if (y
=== null || isNaN(y
)) continue;
1960 if (maxY
== null || y
> maxY
) {
1963 if (minY
== null || y
< minY
) {
1969 return [minY
, maxY
];
1973 * This function is called once when the chart's data is changed or the options
1974 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1975 * idea is that values derived from the chart's data can be computed here,
1976 * rather than every time the chart is drawn. This includes things like the
1977 * number of axes, rolling averages, etc.
1979 Dygraph
.prototype.predraw_
= function() {
1980 // TODO(danvk): move more computations out of drawGraph_ and into here.
1981 this.computeYAxes_();
1983 // Create a new plotter.
1984 if (this.plotter_
) this.plotter_
.clear();
1985 this.plotter_
= new DygraphCanvasRenderer(this,
1986 this.hidden_
, this.layout_
,
1987 this.renderOptions_
);
1989 // The roller sits in the bottom left corner of the chart. We don't know where
1990 // this will be until the options are available, so it's positioned here.
1991 this.createRollInterface_();
1993 // Same thing applies for the labelsDiv. It's right edge should be flush with
1994 // the right edge of the charting area (which may not be the same as the right
1995 // edge of the div, if we have two y-axes.
1996 this.positionLabelsDiv_();
1998 // If the data or options have changed, then we'd better redraw.
2004 * Update the graph with new data. This method is called when the viewing area
2005 * has changed. If the underlying data or options have changed, predraw_ will
2006 * be called before drawGraph_ is called.
2009 Dygraph
.prototype.drawGraph_
= function() {
2010 var data
= this.rawData_
;
2012 // This is used to set the second parameter to drawCallback, below.
2013 var is_initial_draw
= this.is_initial_draw_
;
2014 this.is_initial_draw_
= false;
2016 var minY
= null, maxY
= null;
2017 this.layout_
.removeAllDatasets();
2019 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
2021 // Loop over the fields (series). Go from the last to the first,
2022 // because if they're stacked that's how we accumulate the values.
2024 var cumulative_y
= []; // For stacked series.
2027 var extremes
= {}; // series name -> [low, high]
2029 // Loop over all fields and create datasets
2030 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
2031 if (!this.visibility()[i
- 1]) continue;
2033 var seriesName
= this.attr_("labels")[i
];
2034 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
2037 for (var j
= 0; j
< data
.length
; j
++) {
2038 if (data
[j
][i
] != null || !connectSeparatedPoints
) {
2039 var date
= data
[j
][0];
2040 series
.push([date
, data
[j
][i
]]);
2044 // TODO(danvk): move this into predraw_. It's insane to do it here.
2045 series
= this.rollingAverage(series
, this.rollPeriod_
);
2047 // Prune down to the desired range, if necessary (for zooming)
2048 // Because there can be lines going to points outside of the visible area,
2049 // we actually prune to visible points, plus one on either side.
2050 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2051 if (this.dateWindow_
) {
2052 var low
= this.dateWindow_
[0];
2053 var high
= this.dateWindow_
[1];
2055 // TODO(danvk): do binary search instead of linear search.
2056 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2057 var firstIdx
= null, lastIdx
= null;
2058 for (var k
= 0; k
< series
.length
; k
++) {
2059 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2062 if (series
[k
][0] <= high
) {
2066 if (firstIdx
=== null) firstIdx
= 0;
2067 if (firstIdx
> 0) firstIdx
--;
2068 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2069 if (lastIdx
< series
.length
- 1) lastIdx
++;
2070 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
2071 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
2072 pruned
.push(series
[k
]);
2076 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
2079 var seriesExtremes
= this.extremeValues_(series
);
2082 for (var j
=0; j
<series
.length
; j
++) {
2083 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
2086 } else if (this.attr_("stackedGraph")) {
2087 var l
= series
.length
;
2089 for (var j
= 0; j
< l
; j
++) {
2090 // If one data set has a NaN, let all subsequent stacked
2091 // sets inherit the NaN -- only start at 0 for the first set.
2092 var x
= series
[j
][0];
2093 if (cumulative_y
[x
] === undefined
) {
2094 cumulative_y
[x
] = 0;
2097 actual_y
= series
[j
][1];
2098 cumulative_y
[x
] += actual_y
;
2100 series
[j
] = [x
, cumulative_y
[x
]]
2102 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2103 seriesExtremes
[1] = cumulative_y
[x
];
2105 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2106 seriesExtremes
[0] = cumulative_y
[x
];
2110 extremes
[seriesName
] = seriesExtremes
;
2112 datasets
[i
] = series
;
2115 for (var i
= 1; i
< datasets
.length
; i
++) {
2116 if (!this.visibility()[i
- 1]) continue;
2117 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
2120 // TODO(danvk): this method doesn't need to return anything.
2121 var out
= this.computeYAxisRanges_(extremes
);
2123 var seriesToAxisMap
= out
[1];
2124 this.layout_
.updateOptions( { yAxes
: axes
,
2125 seriesToAxisMap
: seriesToAxisMap
2130 // Tell PlotKit to use this new data and render itself
2131 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
2132 this.layout_
.evaluateWithError();
2133 this.plotter_
.clear();
2134 this.plotter_
.render();
2135 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2136 this.canvas_
.height
);
2138 if (this.attr_("drawCallback") !== null) {
2139 this.attr_("drawCallback")(this, is_initial_draw
);
2144 * Determine properties of the y-axes which are independent of the data
2145 * currently being displayed. This includes things like the number of axes and
2146 * the style of the axes. It does not include the range of each axis and its
2148 * This fills in this.axes_ and this.seriesToAxisMap_.
2149 * axes_ = [ { options } ]
2150 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2151 * indices are into the axes_ array.
2153 Dygraph
.prototype.computeYAxes_
= function() {
2155 if (this.axes_
!= undefined
) {
2156 // Preserve valueWindow settings.
2158 for (var index
= 0; index
< this.axes_
.length
; index
++) {
2159 valueWindow
.push(this.axes_
[index
].valueWindow
);
2163 this.axes_
= [{}]; // always have at least one y-axis.
2164 this.seriesToAxisMap_
= {};
2166 // Get a list of series names.
2167 var labels
= this.attr_("labels");
2169 for (var i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2171 // all options which could be applied per-axis:
2179 'axisLabelFontSize',
2183 // Copy global axis options over to the first axis.
2184 for (var i
= 0; i
< axisOptions
.length
; i
++) {
2185 var k
= axisOptions
[i
];
2186 var v
= this.attr_(k
);
2187 if (v
) this.axes_
[0][k
] = v
;
2190 // Go through once and add all the axes.
2191 for (var seriesName
in series
) {
2192 if (!series
.hasOwnProperty(seriesName
)) continue;
2193 var axis
= this.attr_("axis", seriesName
);
2195 this.seriesToAxisMap_
[seriesName
] = 0;
2198 if (typeof(axis
) == 'object') {
2199 // Add a new axis, making a copy of its per-axis options.
2201 Dygraph
.update(opts
, this.axes_
[0]);
2202 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2203 Dygraph
.update(opts
, axis
);
2204 this.axes_
.push(opts
);
2205 this.seriesToAxisMap_
[seriesName
] = this.axes_
.length
- 1;
2209 // Go through one more time and assign series to an axis defined by another
2210 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2211 for (var seriesName
in series
) {
2212 if (!series
.hasOwnProperty(seriesName
)) continue;
2213 var axis
= this.attr_("axis", seriesName
);
2214 if (typeof(axis
) == 'string') {
2215 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2216 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2217 "series " + axis
+ ", which does not define its own axis.");
2220 var idx
= this.seriesToAxisMap_
[axis
];
2221 this.seriesToAxisMap_
[seriesName
] = idx
;
2225 // Now we remove series from seriesToAxisMap_ which are not visible. We do
2226 // this last so that hiding the first series doesn't destroy the axis
2227 // properties of the primary axis.
2228 var seriesToAxisFiltered
= {};
2229 var vis
= this.visibility();
2230 for (var i
= 1; i
< labels
.length
; i
++) {
2232 if (vis
[i
- 1]) seriesToAxisFiltered
[s
] = this.seriesToAxisMap_
[s
];
2234 this.seriesToAxisMap_
= seriesToAxisFiltered
;
2236 if (valueWindow
!= undefined
) {
2237 // Restore valueWindow settings.
2238 for (var index
= 0; index
< valueWindow
.length
; index
++) {
2239 this.axes_
[index
].valueWindow
= valueWindow
[index
];
2245 * Returns the number of y-axes on the chart.
2246 * @return {Number} the number of axes.
2248 Dygraph
.prototype.numAxes
= function() {
2250 for (var series
in this.seriesToAxisMap_
) {
2251 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2252 var idx
= this.seriesToAxisMap_
[series
];
2253 if (idx
> last_axis
) last_axis
= idx
;
2255 return 1 + last_axis
;
2259 * Determine the value range and tick marks for each axis.
2260 * @param {Object} extremes A mapping from seriesName -> [low, high]
2261 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2263 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2264 // Build a map from axis number -> [list of series names]
2265 var seriesForAxis
= [];
2266 for (var series
in this.seriesToAxisMap_
) {
2267 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2268 var idx
= this.seriesToAxisMap_
[series
];
2269 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2270 seriesForAxis
[idx
].push(series
);
2273 // Compute extreme values, a span and tick marks for each axis.
2274 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2275 var axis
= this.axes_
[i
];
2276 if (axis
.valueWindow
) {
2277 // This is only set if the user has zoomed on the y-axis. It is never set
2278 // by a user. It takes precedence over axis.valueRange because, if you set
2279 // valueRange, you'd still expect to be able to pan.
2280 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2281 } else if (axis
.valueRange
) {
2282 // This is a user-set value range for this axis.
2283 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2285 // Calculate the extremes of extremes.
2286 var series
= seriesForAxis
[i
];
2287 var minY
= Infinity
; // extremes[series[0]][0];
2288 var maxY
= -Infinity
; // extremes[series[0]][1];
2289 for (var j
= 0; j
< series
.length
; j
++) {
2290 minY
= Math
.min(extremes
[series
[j
]][0], minY
);
2291 maxY
= Math
.max(extremes
[series
[j
]][1], maxY
);
2293 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2295 // Add some padding and round up to an integer to be human-friendly.
2296 var span
= maxY
- minY
;
2297 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2298 if (span
== 0) { span
= maxY
; }
2299 var maxAxisY
= maxY
+ 0.1 * span
;
2300 var minAxisY
= minY
- 0.1 * span
;
2302 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2303 if (!this.attr_("avoidMinZero")) {
2304 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2305 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2308 if (this.attr_("includeZero")) {
2309 if (maxY
< 0) maxAxisY
= 0;
2310 if (minY
> 0) minAxisY
= 0;
2313 axis
.computedValueRange
= [minAxisY
, maxAxisY
];
2316 // Add ticks. By default, all axes inherit the tick positions of the
2317 // primary axis. However, if an axis is specifically marked as having
2318 // independent ticks, then that is permissible as well.
2319 if (i
== 0 || axis
.independentTicks
) {
2321 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2322 axis
.computedValueRange
[1],
2326 var p_axis
= this.axes_
[0];
2327 var p_ticks
= p_axis
.ticks
;
2328 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2329 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2330 var tick_values
= [];
2331 for (var i
= 0; i
< p_ticks
.length
; i
++) {
2332 var y_frac
= (p_ticks
[i
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2333 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2334 tick_values
.push(y_val
);
2338 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2339 axis
.computedValueRange
[1],
2340 this, axis
, tick_values
);
2344 return [this.axes_
, this.seriesToAxisMap_
];
2348 * Calculates the rolling average of a data set.
2349 * If originalData is [label, val], rolls the average of those.
2350 * If originalData is [label, [, it's interpreted as [value, stddev]
2351 * and the roll is returned in the same form, with appropriately reduced
2352 * stddev for each value.
2353 * Note that this is where fractional input (i.e. '5/10') is converted into
2355 * @param {Array} originalData The data in the appropriate format (see above)
2356 * @param {Number} rollPeriod The number of days over which to average the data
2358 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2359 if (originalData
.length
< 2)
2360 return originalData
;
2361 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
2362 var rollingData
= [];
2363 var sigma
= this.attr_("sigma");
2365 if (this.fractions_
) {
2367 var den
= 0; // numerator/denominator
2369 for (var i
= 0; i
< originalData
.length
; i
++) {
2370 num
+= originalData
[i
][1][0];
2371 den
+= originalData
[i
][1][1];
2372 if (i
- rollPeriod
>= 0) {
2373 num
-= originalData
[i
- rollPeriod
][1][0];
2374 den
-= originalData
[i
- rollPeriod
][1][1];
2377 var date
= originalData
[i
][0];
2378 var value
= den
? num
/ den
: 0.0;
2379 if (this.attr_("errorBars")) {
2380 if (this.wilsonInterval_
) {
2381 // For more details on this confidence interval, see:
2382 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2384 var p
= value
< 0 ? 0 : value
, n
= den
;
2385 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2386 var denom
= 1 + sigma
* sigma
/ den
;
2387 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2388 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2389 rollingData
[i
] = [date
,
2390 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2392 rollingData
[i
] = [date
, [0, 0, 0]];
2395 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2396 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2399 rollingData
[i
] = [date
, mult
* value
];
2402 } else if (this.attr_("customBars")) {
2407 for (var i
= 0; i
< originalData
.length
; i
++) {
2408 var data
= originalData
[i
][1];
2410 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2412 if (y
!= null && !isNaN(y
)) {
2418 if (i
- rollPeriod
>= 0) {
2419 var prev
= originalData
[i
- rollPeriod
];
2420 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
2427 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2428 1.0 * (mid
- low
) / count
,
2429 1.0 * (high
- mid
) / count
]];
2432 // Calculate the rolling average for the first rollPeriod - 1 points where
2433 // there is not enough data to roll over the full number of days
2434 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
2435 if (!this.attr_("errorBars")){
2436 if (rollPeriod
== 1) {
2437 return originalData
;
2440 for (var i
= 0; i
< originalData
.length
; i
++) {
2443 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2444 var y
= originalData
[j
][1];
2445 if (y
== null || isNaN(y
)) continue;
2447 sum
+= originalData
[j
][1];
2450 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2452 rollingData
[i
] = [originalData
[i
][0], null];
2457 for (var i
= 0; i
< originalData
.length
; i
++) {
2461 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2462 var y
= originalData
[j
][1][0];
2463 if (y
== null || isNaN(y
)) continue;
2465 sum
+= originalData
[j
][1][0];
2466 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2469 var stddev
= Math
.sqrt(variance
) / num_ok
;
2470 rollingData
[i
] = [originalData
[i
][0],
2471 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2473 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2483 * Parses a date, returning the number of milliseconds since epoch. This can be
2484 * passed in as an xValueParser in the Dygraph constructor.
2485 * TODO(danvk): enumerate formats that this understands.
2486 * @param {String} A date in YYYYMMDD format.
2487 * @return {Number} Milliseconds since epoch.
2490 Dygraph
.dateParser
= function(dateStr
, self
) {
2493 if (dateStr
.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12'
2494 dateStrSlashed
= dateStr
.replace("-", "/", "g");
2495 while (dateStrSlashed
.search("-") != -1) {
2496 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
2498 d
= Date
.parse(dateStrSlashed
);
2499 } else if (dateStr
.length
== 8) { // e.g. '20090712'
2500 // TODO(danvk): remove support for this format. It's confusing.
2501 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
2502 + "/" + dateStr
.substr(6,2);
2503 d
= Date
.parse(dateStrSlashed
);
2505 // Any format that Date.parse will accept, e.g. "2009/07/12" or
2506 // "2009/07/12 12:34:56"
2507 d
= Date
.parse(dateStr
);
2510 if (!d
|| isNaN(d
)) {
2511 self
.error("Couldn't parse " + dateStr
+ " as a date");
2517 * Detects the type of the str (date or numeric) and sets the various
2518 * formatting attributes in this.attrs_ based on this type.
2519 * @param {String} str An x value.
2522 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2524 if (str
.indexOf('-') >= 0 ||
2525 str
.indexOf('/') >= 0 ||
2526 isNaN(parseFloat(str
))) {
2528 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2529 // TODO(danvk): remove support for this format.
2534 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2535 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2536 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2537 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2539 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2540 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2541 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2542 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2547 * Parses a string in a special csv format. We expect a csv file where each
2548 * line is a date point, and the first field in each line is the date string.
2549 * We also expect that all remaining fields represent series.
2550 * if the errorBars attribute is set, then interpret the fields as:
2551 * date, series1, stddev1, series2, stddev2, ...
2552 * @param {Array.<Object>} data See above.
2555 * @return Array.<Object> An array with one entry for each row. These entries
2556 * are an array of cells in that row. The first entry is the parsed x-value for
2557 * the row. The second, third, etc. are the y-values. These can take on one of
2558 * three forms, depending on the CSV and constructor parameters:
2560 * 2. [ value, stddev ]
2561 * 3. [ low value, center value, high value ]
2563 Dygraph
.prototype.parseCSV_
= function(data
) {
2565 var lines
= data
.split("\n");
2567 // Use the default delimiter or fall back to a tab if that makes sense.
2568 var delim
= this.attr_('delimiter');
2569 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2574 if (this.labelsFromCSV_
) {
2576 this.attrs_
.labels
= lines
[0].split(delim
);
2579 // Parse the x as a float or return null if it's not a number.
2580 var parseFloatOrNull
= function(x
) {
2581 var val
= parseFloat(x
);
2582 // isFinite() returns false for NaN and +/-Infinity
.
2583 return isFinite(val
) ? val
: null;
2587 var defaultParserSet
= false; // attempt to auto-detect x value type
2588 var expectedCols
= this.attr_("labels").length
;
2589 var outOfOrder
= false;
2590 for (var i
= start
; i
< lines
.length
; i
++) {
2591 var line
= lines
[i
];
2592 if (line
.length
== 0) continue; // skip blank lines
2593 if (line
[0] == '#') continue; // skip comment lines
2594 var inFields
= line
.split(delim
);
2595 if (inFields
.length
< 2) continue;
2598 if (!defaultParserSet
) {
2599 this.detectTypeFromString_(inFields
[0]);
2600 xParser
= this.attr_("xValueParser");
2601 defaultParserSet
= true;
2603 fields
[0] = xParser(inFields
[0], this);
2605 // If fractions are expected, parse the numbers as "A/B
"
2606 if (this.fractions_) {
2607 for (var j = 1; j < inFields.length; j++) {
2608 // TODO(danvk): figure out an appropriate way to flag parse errors.
2609 var vals = inFields[j].split("/");
2610 fields[j] = [parseFloatOrNull(vals[0]), parseFloatOrNull(vals[1])];
2612 } else if (this.attr_("errorBars
")) {
2613 // If there are error bars, values are (value, stddev) pairs
2614 for (var j = 1; j < inFields.length; j += 2)
2615 fields[(j + 1) / 2] = [parseFloatOrNull(inFields[j]),
2616 parseFloatOrNull(inFields[j + 1])];
2617 } else if (this.attr_("customBars
")) {
2618 // Bars are a low;center;high tuple
2619 for (var j = 1; j < inFields.length; j++) {
2620 var vals = inFields[j].split(";");
2621 fields[j] = [ parseFloatOrNull(vals[0]),
2622 parseFloatOrNull(vals[1]),
2623 parseFloatOrNull(vals[2]) ];
2626 // Values are just numbers
2627 for (var j = 1; j < inFields.length; j++) {
2628 fields[j] = parseFloatOrNull(inFields[j]);
2631 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2636 if (fields.length != expectedCols) {
2637 this.error("Number of columns
in line
" + i + " (" + fields.length +
2638 ") does not agree
with number of
labels (" + expectedCols +
2644 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2645 ret.sort(function(a,b) { return a[0] - b[0] });
2652 * The user has provided their data as a pre-packaged JS array. If the x values
2653 * are numeric, this is the same as dygraphs' internal format. If the x values
2654 * are dates, we need to convert them from Date objects to ms since epoch.
2655 * @param {Array.<Object>} data
2656 * @return {Array.<Object>} data with numeric x values.
2658 Dygraph.prototype.parseArray_ = function(data) {
2659 // Peek at the first x value to see if it's numeric.
2660 if (data.length == 0) {
2661 this.error("Can
't plot empty data set");
2664 if (data[0].length == 0) {
2665 this.error("Data set cannot contain an empty row");
2669 if (this.attr_("labels") == null) {
2670 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2671 "in the options parameter");
2672 this.attrs_.labels = [ "X" ];
2673 for (var i = 1; i < data[0].length; i++) {
2674 this.attrs_.labels.push("Y" + i);
2678 if (Dygraph.isDateLike(data[0][0])) {
2679 // Some intelligent defaults for a date x-axis.
2680 this.attrs_.xValueFormatter = Dygraph.dateString_;
2681 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
2682 this.attrs_.xTicker = Dygraph.dateTicker;
2684 // Assume they're all dates
.
2685 var parsedData
= Dygraph
.clone(data
);
2686 for (var i
= 0; i
< data
.length
; i
++) {
2687 if (parsedData
[i
].length
== 0) {
2688 this.error("Row " + (1 + i
) + " of data is empty");
2691 if (parsedData
[i
][0] == null
2692 || typeof(parsedData
[i
][0].getTime
) != 'function'
2693 || isNaN(parsedData
[i
][0].getTime())) {
2694 this.error("x value in row " + (1 + i
) + " is not a Date");
2697 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2701 // Some intelligent defaults for a numeric x-axis.
2702 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2703 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2709 * Parses a DataTable object from gviz.
2710 * The data is expected to have a first column that is either a date or a
2711 * number. All subsequent columns must be numbers. If there is a clear mismatch
2712 * between this.xValueParser_ and the type of the first column, it will be
2713 * fixed. Fills out rawData_.
2714 * @param {Array.<Object>} data See above.
2717 Dygraph
.prototype.parseDataTable_
= function(data
) {
2718 var cols
= data
.getNumberOfColumns();
2719 var rows
= data
.getNumberOfRows();
2721 var indepType
= data
.getColumnType(0);
2722 if (indepType
== 'date' || indepType
== 'datetime') {
2723 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2724 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2725 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2726 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2727 } else if (indepType
== 'number') {
2728 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2729 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2730 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2731 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2733 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2734 "column 1 of DataTable input (Got '" + indepType
+ "')");
2738 // Array of the column indices which contain data (and not annotations).
2740 var annotationCols
= {}; // data index -> [annotation cols]
2741 var hasAnnotations
= false;
2742 for (var i
= 1; i
< cols
; i
++) {
2743 var type
= data
.getColumnType(i
);
2744 if (type
== 'number') {
2746 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2747 // This is OK -- it's an annotation column.
2748 var dataIdx
= colIdx
[colIdx
.length
- 1];
2749 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2750 annotationCols
[dataIdx
] = [i
];
2752 annotationCols
[dataIdx
].push(i
);
2754 hasAnnotations
= true;
2756 this.error("Only 'number' is supported as a dependent type with Gviz." +
2757 " 'string' is only supported if displayAnnotations is true");
2761 // Read column labels
2762 // TODO(danvk): add support back for errorBars
2763 var labels
= [data
.getColumnLabel(0)];
2764 for (var i
= 0; i
< colIdx
.length
; i
++) {
2765 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2766 if (this.attr_("errorBars")) i
+= 1;
2768 this.attrs_
.labels
= labels
;
2769 cols
= labels
.length
;
2772 var outOfOrder
= false;
2773 var annotations
= [];
2774 for (var i
= 0; i
< rows
; i
++) {
2776 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2777 data
.getValue(i
, 0) === null) {
2778 this.warn("Ignoring row " + i
+
2779 " of DataTable because of undefined or null first column.");
2783 if (indepType
== 'date' || indepType
== 'datetime') {
2784 row
.push(data
.getValue(i
, 0).getTime());
2786 row
.push(data
.getValue(i
, 0));
2788 if (!this.attr_("errorBars")) {
2789 for (var j
= 0; j
< colIdx
.length
; j
++) {
2790 var col
= colIdx
[j
];
2791 row
.push(data
.getValue(i
, col
));
2792 if (hasAnnotations
&&
2793 annotationCols
.hasOwnProperty(col
) &&
2794 data
.getValue(i
, annotationCols
[col
][0]) != null) {
2796 ann
.series
= data
.getColumnLabel(col
);
2798 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
2800 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2801 if (k
) ann
.text
+= "\n";
2802 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2804 annotations
.push(ann
);
2808 for (var j
= 0; j
< cols
- 1; j
++) {
2809 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2812 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2816 // Strip out infinities, which give dygraphs problems later on.
2817 for (var j
= 0; j
< row
.length
; j
++) {
2818 if (!isFinite(row
[j
])) row
[j
] = null;
2824 this.warn("DataTable is out of order; order it correctly to speed loading.");
2825 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
2827 this.rawData_
= ret
;
2829 if (annotations
.length
> 0) {
2830 this.setAnnotations(annotations
, true);
2834 // These functions are all based on MochiKit.
2835 Dygraph
.update
= function (self
, o
) {
2836 if (typeof(o
) != 'undefined' && o
!== null) {
2838 if (o
.hasOwnProperty(k
)) {
2846 Dygraph
.isArrayLike
= function (o
) {
2847 var typ
= typeof(o
);
2849 (typ
!= 'object' && !(typ
== 'function' &&
2850 typeof(o
.item
) == 'function')) ||
2852 typeof(o
.length
) != 'number' ||
2860 Dygraph
.isDateLike
= function (o
) {
2861 if (typeof(o
) != "object" || o
=== null ||
2862 typeof(o
.getTime
) != 'function') {
2868 Dygraph
.clone
= function(o
) {
2869 // TODO(danvk): figure out how MochiKit's version works
2871 for (var i
= 0; i
< o
.length
; i
++) {
2872 if (Dygraph
.isArrayLike(o
[i
])) {
2873 r
.push(Dygraph
.clone(o
[i
]));
2883 * Get the CSV data. If it's in a function, call that function. If it's in a
2884 * file, do an XMLHttpRequest to get it.
2887 Dygraph
.prototype.start_
= function() {
2888 if (typeof this.file_
== 'function') {
2889 // CSV string. Pretend we got it via XHR.
2890 this.loadedEvent_(this.file_());
2891 } else if (Dygraph
.isArrayLike(this.file_
)) {
2892 this.rawData_
= this.parseArray_(this.file_
);
2894 } else if (typeof this.file_
== 'object' &&
2895 typeof this.file_
.getColumnRange
== 'function') {
2896 // must be a DataTable from gviz.
2897 this.parseDataTable_(this.file_
);
2899 } else if (typeof this.file_
== 'string') {
2900 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2901 if (this.file_
.indexOf('\n') >= 0) {
2902 this.loadedEvent_(this.file_
);
2904 var req
= new XMLHttpRequest();
2906 req
.onreadystatechange
= function () {
2907 if (req
.readyState
== 4) {
2908 if (req
.status
== 200) {
2909 caller
.loadedEvent_(req
.responseText
);
2914 req
.open("GET", this.file_
, true);
2918 this.error("Unknown data format: " + (typeof this.file_
));
2923 * Changes various properties of the graph. These can include:
2925 * <li>file: changes the source data for the graph</li>
2926 * <li>errorBars: changes whether the data contains stddev</li>
2928 * @param {Object} attrs The new properties and values
2930 Dygraph
.prototype.updateOptions
= function(attrs
) {
2931 // TODO(danvk): this is a mess. Rethink this function.
2932 if ('rollPeriod' in attrs
) {
2933 this.rollPeriod_
= attrs
.rollPeriod
;
2935 if ('dateWindow' in attrs
) {
2936 this.dateWindow_
= attrs
.dateWindow
;
2939 // TODO(danvk): validate per-series options.
2944 // highlightCircleSize
2946 Dygraph
.update(this.user_attrs_
, attrs
);
2947 Dygraph
.update(this.renderOptions_
, attrs
);
2949 this.labelsFromCSV_
= (this.attr_("labels") == null);
2951 // TODO(danvk): this doesn't match the constructor logic
2952 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
2953 if (attrs
['file']) {
2954 this.file_
= attrs
['file'];
2962 * Resizes the dygraph. If no parameters are specified, resizes to fill the
2963 * containing div (which has presumably changed size since the dygraph was
2964 * instantiated. If the width/height are specified, the div will be resized.
2966 * This is far more efficient than destroying and re-instantiating a
2967 * Dygraph, since it doesn't have to reparse the underlying data.
2969 * @param {Number} width Width (in pixels)
2970 * @param {Number} height Height (in pixels)
2972 Dygraph
.prototype.resize
= function(width
, height
) {
2973 if (this.resize_lock
) {
2976 this.resize_lock
= true;
2978 if ((width
=== null) != (height
=== null)) {
2979 this.warn("Dygraph.resize() should be called with zero parameters or " +
2980 "two non-NULL parameters. Pretending it was zero.");
2981 width
= height
= null;
2984 // TODO(danvk): there should be a clear() method.
2985 this.maindiv_
.innerHTML
= "";
2986 this.attrs_
.labelsDiv
= null;
2989 this.maindiv_
.style
.width
= width
+ "px";
2990 this.maindiv_
.style
.height
= height
+ "px";
2991 this.width_
= width
;
2992 this.height_
= height
;
2994 this.width_
= this.maindiv_
.offsetWidth
;
2995 this.height_
= this.maindiv_
.offsetHeight
;
2998 this.createInterface_();
3001 this.resize_lock
= false;
3005 * Adjusts the number of days in the rolling average. Updates the graph to
3006 * reflect the new averaging period.
3007 * @param {Number} length Number of days over which to average the data.
3009 Dygraph
.prototype.adjustRoll
= function(length
) {
3010 this.rollPeriod_
= length
;
3015 * Returns a boolean array of visibility statuses.
3017 Dygraph
.prototype.visibility
= function() {
3018 // Do lazy-initialization, so that this happens after we know the number of
3020 if (!this.attr_("visibility")) {
3021 this.attrs_
["visibility"] = [];
3023 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
3024 this.attr_("visibility").push(true);
3026 return this.attr_("visibility");
3030 * Changes the visiblity of a series.
3032 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3033 var x
= this.visibility();
3034 if (num
< 0 || num
>= x
.length
) {
3035 this.warn("invalid series number in setVisibility: " + num
);
3043 * Update the list of annotations and redraw the chart.
3045 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3046 // Only add the annotation CSS rule once we know it will be used.
3047 Dygraph
.addAnnotationRule();
3048 this.annotations_
= ann
;
3049 this.layout_
.setAnnotations(this.annotations_
);
3050 if (!suppressDraw
) {
3056 * Return the list of annotations.
3058 Dygraph
.prototype.annotations
= function() {
3059 return this.annotations_
;
3063 * Get the index of a series (column) given its name. The first column is the
3064 * x-axis, so the data series start with index 1.
3066 Dygraph
.prototype.indexFromSetName
= function(name
) {
3067 var labels
= this.attr_("labels");
3068 for (var i
= 0; i
< labels
.length
; i
++) {
3069 if (labels
[i
] == name
) return i
;
3074 Dygraph
.addAnnotationRule
= function() {
3075 if (Dygraph
.addedAnnotationCSS
) return;
3077 var rule
= "border: 1px solid black; " +
3078 "background-color: white; " +
3079 "text-align: center;";
3081 var styleSheetElement
= document
.createElement("style");
3082 styleSheetElement
.type
= "text/css";
3083 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3085 // Find the first style sheet that we can access.
3086 // We may not add a rule to a style sheet from another domain for security
3087 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3088 // adds its own style sheets from google.com.
3089 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3090 if (document
.styleSheets
[i
].disabled
) continue;
3091 var mysheet
= document
.styleSheets
[i
];
3093 if (mysheet
.insertRule
) { // Firefox
3094 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3095 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3096 } else if (mysheet
.addRule
) { // IE
3097 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3099 Dygraph
.addedAnnotationCSS
= true;
3102 // Was likely a security exception.
3106 this.warn("Unable to add default annotation CSS rule; display may be off.");
3110 * Create a new canvas element. This is more complex than a simple
3111 * document.createElement("canvas") because of IE and excanvas.
3113 Dygraph
.createCanvas
= function() {
3114 var canvas
= document
.createElement("canvas");
3116 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
3117 if (isIE
&& (typeof(G_vmlCanvasManager
) != 'undefined')) {
3118 canvas
= G_vmlCanvasManager
.initElement(canvas
);
3126 * A wrapper around Dygraph that implements the gviz API.
3127 * @param {Object} container The DOM object the visualization should live in.
3129 Dygraph
.GVizChart
= function(container
) {
3130 this.container
= container
;
3133 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
3134 // Clear out any existing dygraph.
3135 // TODO(danvk): would it make more sense to simply redraw using the current
3136 // date_graph object?
3137 this.container
.innerHTML
= '';
3138 if (typeof(this.date_graph
) != 'undefined') {
3139 this.date_graph
.destroy();
3142 this.date_graph
= new Dygraph(this.container
, data
, options
);
3146 * Google charts compatible setSelection
3147 * Only row selection is supported, all points in the row will be highlighted
3148 * @param {Array} array of the selected cells
3151 Dygraph
.GVizChart
.prototype.setSelection
= function(selection_array
) {
3153 if (selection_array
.length
) {
3154 row
= selection_array
[0].row
;
3156 this.date_graph
.setSelection(row
);
3160 * Google charts compatible getSelection implementation
3161 * @return {Array} array of the selected cells
3164 Dygraph
.GVizChart
.prototype.getSelection
= function() {
3167 var row
= this.date_graph
.getSelection();
3169 if (row
< 0) return selection
;
3172 for (var i
in this.date_graph
.layout_
.datasets
) {
3173 selection
.push({row
: row
, column
: col
});
3180 // Older pages may still use this name.
3181 DateGraph
= Dygraph
;