1 // Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
2 // All Rights Reserved.
5 * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
6 * string. Dygraph can handle multiple series with or without error bars. The
7 * date/value ranges will be automatically set. Dygraph uses the
8 * <canvas> tag, so it only works in FF1.5+.
9 * @author danvdk@gmail.com (Dan Vanderkam)
12 <div id="graphdiv" style="width:800px; height:500px;"></div>
13 <script type="text/javascript">
14 new Dygraph(document.getElementById("graphdiv"),
15 "datafile.csv", // CSV file with headers
19 The CSV file is of the form
21 Date,SeriesA,SeriesB,SeriesC
25 If the 'errorBars' option is set in the constructor, the input should be of
28 Date,SeriesA,SeriesB,...
29 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
30 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
32 If the 'fractions' option is set, the input should be of the form:
34 Date,SeriesA,SeriesB,...
35 YYYYMMDD,A1/B1,A2/B2,...
36 YYYYMMDD,A1/B1,A2/B2,...
38 And error bars will be calculated automatically using a binomial distribution.
40 For further documentation and examples, see http://www.danvk.org/dygraphs
45 * An interactive, zoomable graph
46 * @param {String | Function} file A file containing CSV data or a function that
47 * returns this data. The expected format for each line is
48 * YYYYMMDD,val1,val2,... or, if attrs.errorBars is set,
49 * YYYYMMDD,val1,stddev1,val2,stddev2,...
50 * @param {Object} attrs Various other attributes, e.g. errorBars determines
51 * whether the input data contains error ranges.
53 Dygraph
= function(div
, data
, opts
) {
54 if (arguments
.length
> 0) {
55 if (arguments
.length
== 4) {
56 // Old versions of dygraphs took in the series labels as a constructor
57 // parameter. This doesn't make sense anymore, but it's easy to continue
58 // to support this usage.
59 this.warn("Using deprecated four-argument dygraph constructor");
60 this.__old_init__(div
, data
, arguments
[2], arguments
[3]);
62 this.__init__(div
, data
, opts
);
67 Dygraph
.NAME
= "Dygraph";
68 Dygraph
.VERSION
= "1.2";
69 Dygraph
.__repr__
= function() {
70 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
72 Dygraph
.toString
= function() {
73 return this.__repr__();
76 // Various default values
77 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
78 Dygraph
.DEFAULT_WIDTH
= 480;
79 Dygraph
.DEFAULT_HEIGHT
= 320;
80 Dygraph
.AXIS_LINE_WIDTH
= 0.3;
82 // Default attribute values.
83 Dygraph
.DEFAULT_ATTRS
= {
84 highlightCircleSize
: 3,
90 // TODO(danvk): move defaults from createStatusMessage_ here.
92 labelsSeparateLines
: false,
93 labelsShowZeroValues
: true,
96 showLabelsOnHighlight
: true,
98 yValueFormatter
: function(x
) { return Dygraph
.round_(x
, 2); },
103 axisLabelFontSize
: 14,
106 xAxisLabelFormatter
: Dygraph
.dateAxisFormatter
,
110 xValueFormatter
: Dygraph
.dateString_
,
111 xValueParser
: Dygraph
.dateParser
,
112 xTicker
: Dygraph
.dateTicker
,
120 wilsonInterval
: true, // only relevant if fractions is true
124 connectSeparatedPoints
: false,
127 hideOverlayOnMouseOut
: true,
132 // Various logging levels.
138 // Directions for panning and zooming. Use bit operations when combined
139 // values are possible.
140 Dygraph
.HORIZONTAL
= 1;
141 Dygraph
.VERTICAL
= 2;
143 // Used for initializing annotation CSS rules only once.
144 Dygraph
.addedAnnotationCSS
= false;
146 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
147 // Labels is no longer a constructor parameter, since it's typically set
148 // directly from the data source. It also conains a name for the x-axis,
149 // which the previous constructor form did not.
150 if (labels
!= null) {
151 var new_labels
= ["Date"];
152 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
153 Dygraph
.update(attrs
, { 'labels': new_labels
});
155 this.__init__(div
, file
, attrs
);
159 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
160 * and interaction <canvas> inside of it. See the constructor for details
162 * @param {Element} div the Element to render the graph into.
163 * @param {String | Function} file Source data
164 * @param {Object} attrs Miscellaneous other options
167 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
168 // Support two-argument constructor
169 if (attrs
== null) { attrs
= {}; }
171 // Copy the important bits into the object
172 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
175 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
176 this.previousVerticalX_
= -1;
177 this.fractions_
= attrs
.fractions
|| false;
178 this.dateWindow_
= attrs
.dateWindow
|| null;
179 // valueRange and valueWindow are similar, but not the same. valueRange is a
180 // locally-stored copy of the attribute. valueWindow starts off the same as
181 // valueRange but is impacted by zoom or pan effects. valueRange is kept
182 // around to restore the original value back to valueRange.
183 this.valueRange_
= attrs
.valueRange
|| null;
184 this.valueWindow_
= this.valueRange_
;
186 this.wilsonInterval_
= attrs
.wilsonInterval
|| true;
187 this.is_initial_draw_
= true;
188 this.annotations_
= [];
190 // Clear the div. This ensure that, if multiple dygraphs are passed the same
191 // div, then only one will be drawn.
194 // If the div isn't already sized then inherit from our attrs or
195 // give it a default size.
196 if (div
.style
.width
== '') {
197 div
.style
.width
= attrs
.width
|| Dygraph
.DEFAULT_WIDTH
+ "px";
199 if (div
.style
.height
== '') {
200 div
.style
.height
= attrs
.height
|| Dygraph
.DEFAULT_HEIGHT
+ "px";
202 this.width_
= parseInt(div
.style
.width
, 10);
203 this.height_
= parseInt(div
.style
.height
, 10);
204 // The div might have been specified as percent of the current window size,
205 // convert that to an appropriate number of pixels.
206 if (div
.style
.width
.indexOf("%") == div
.style
.width
.length
- 1) {
207 this.width_
= div
.offsetWidth
;
209 if (div
.style
.height
.indexOf("%") == div
.style
.height
.length
- 1) {
210 this.height_
= div
.offsetHeight
;
213 if (this.width_
== 0) {
214 this.error("dygraph has zero width. Please specify a width in pixels.");
216 if (this.height_
== 0) {
217 this.error("dygraph has zero height. Please specify a height in pixels.");
220 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
221 if (attrs
['stackedGraph']) {
222 attrs
['fillGraph'] = true;
223 // TODO(nikhilk): Add any other stackedGraph checks here.
226 // Dygraphs has many options, some of which interact with one another.
227 // To keep track of everything, we maintain two sets of options:
229 // this.user_attrs_ only options explicitly set by the user.
230 // this.attrs_ defaults, options derived from user_attrs_, data.
232 // Options are then accessed this.attr_('attr'), which first looks at
233 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
234 // defaults without overriding behavior that the user specifically asks for.
235 this.user_attrs_
= {};
236 Dygraph
.update(this.user_attrs_
, attrs
);
239 Dygraph
.update(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
241 this.boundaryIds_
= [];
243 // Make a note of whether labels will be pulled from the CSV file.
244 this.labelsFromCSV_
= (this.attr_("labels") == null);
246 Dygraph
.addAnnotationRule();
248 // Create the containing DIV and other interactive elements
249 this.createInterface_();
254 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
256 typeof(this.user_attrs_
[seriesName
]) != 'undefined' &&
257 this.user_attrs_
[seriesName
] != null &&
258 typeof(this.user_attrs_
[seriesName
][name
]) != 'undefined') {
259 return this.user_attrs_
[seriesName
][name
];
260 } else if (typeof(this.user_attrs_
[name
]) != 'undefined') {
261 return this.user_attrs_
[name
];
262 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
263 return this.attrs_
[name
];
269 // TODO(danvk): any way I can get the line numbers to be this.warn call?
270 Dygraph
.prototype.log
= function(severity
, message
) {
271 if (typeof(console
) != 'undefined') {
274 console
.debug('dygraphs: ' + message
);
277 console
.info('dygraphs: ' + message
);
279 case Dygraph
.WARNING
:
280 console
.warn('dygraphs: ' + message
);
283 console
.error('dygraphs: ' + message
);
288 Dygraph
.prototype.info
= function(message
) {
289 this.log(Dygraph
.INFO
, message
);
291 Dygraph
.prototype.warn
= function(message
) {
292 this.log(Dygraph
.WARNING
, message
);
294 Dygraph
.prototype.error
= function(message
) {
295 this.log(Dygraph
.ERROR
, message
);
299 * Returns the current rolling period, as set by the user or an option.
300 * @return {Number} The number of days in the rolling window
302 Dygraph
.prototype.rollPeriod
= function() {
303 return this.rollPeriod_
;
307 * Returns the currently-visible x-range. This can be affected by zooming,
308 * panning or a call to updateOptions.
309 * Returns a two-element array: [left, right].
310 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
312 Dygraph
.prototype.xAxisRange
= function() {
313 if (this.dateWindow_
) return this.dateWindow_
;
315 // The entire chart is visible.
316 var left
= this.rawData_
[0][0];
317 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
318 return [left
, right
];
322 * Returns the currently-visible y-range. This can be affected by zooming,
323 * panning or a call to updateOptions.
324 * Returns a two-element array: [bottom, top].
326 Dygraph
.prototype.yAxisRange
= function() {
327 return this.displayedYRange_
;
331 * Convert from data coordinates to canvas/div X/Y coordinates.
332 * Returns a two-element array: [X, Y]
334 Dygraph
.prototype.toDomCoords
= function(x
, y
) {
335 var ret
= [null, null];
336 var area
= this.plotter_
.area
;
338 var xRange
= this.xAxisRange();
339 ret
[0] = area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
343 var yRange
= this.yAxisRange();
344 ret
[1] = area
.y
+ (yRange
[1] - y
) / (yRange
[1] - yRange
[0]) * area
.h
;
350 // TODO(danvk): use these functions throughout dygraphs.
352 * Convert from canvas/div coords to data coordinates.
353 * Returns a two-element array: [X, Y]
355 Dygraph
.prototype.toDataCoords
= function(x
, y
) {
356 var ret
= [null, null];
357 var area
= this.plotter_
.area
;
359 var xRange
= this.xAxisRange();
360 ret
[0] = xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
364 var yRange
= this.yAxisRange();
365 ret
[1] = yRange
[0] + (area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
372 * Returns the number of columns (including the independent variable).
374 Dygraph
.prototype.numColumns
= function() {
375 return this.rawData_
[0].length
;
379 * Returns the number of rows (excluding any header/label row).
381 Dygraph
.prototype.numRows
= function() {
382 return this.rawData_
.length
;
386 * Returns the value in the given row and column. If the row and column exceed
387 * the bounds on the data, returns null. Also returns null if the value is
390 Dygraph
.prototype.getValue
= function(row
, col
) {
391 if (row
< 0 || row
> this.rawData_
.length
) return null;
392 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
394 return this.rawData_
[row
][col
];
397 Dygraph
.addEvent
= function(el
, evt
, fn
) {
398 var normed_fn
= function(e
) {
399 if (!e
) var e
= window
.event
;
402 if (window
.addEventListener
) { // Mozilla, Netscape, Firefox
403 el
.addEventListener(evt
, normed_fn
, false);
405 el
.attachEvent('on' + evt
, normed_fn
);
409 Dygraph
.clipCanvas_
= function(cnv
, clip
) {
410 var ctx
= cnv
.getContext("2d");
412 ctx
.rect(clip
.left
, clip
.top
, clip
.width
, clip
.height
);
417 * Generates interface elements for the Dygraph: a containing div, a div to
418 * display the current point, and a textbox to adjust the rolling average
419 * period. Also creates the Renderer/Layout elements.
422 Dygraph
.prototype.createInterface_
= function() {
423 // Create the all-enclosing graph div
424 var enclosing
= this.maindiv_
;
426 this.graphDiv
= document
.createElement("div");
427 this.graphDiv
.style
.width
= this.width_
+ "px";
428 this.graphDiv
.style
.height
= this.height_
+ "px";
429 enclosing
.appendChild(this.graphDiv
);
433 left
: this.attr_("yAxisLabelWidth") + 2 * this.attr_("axisTickSize")
435 clip
.width
= this.width_
- clip
.left
- this.attr_("rightGap");
436 clip
.height
= this.height_
- this.attr_("axisLabelFontSize")
437 - 2 * this.attr_("axisTickSize");
438 this.clippingArea_
= clip
;
440 // Create the canvas for interactive parts of the chart.
441 this.canvas_
= Dygraph
.createCanvas();
442 this.canvas_
.style
.position
= "absolute";
443 this.canvas_
.width
= this.width_
;
444 this.canvas_
.height
= this.height_
;
445 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
446 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
448 // ... and for static parts of the chart.
449 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
451 // The interactive parts of the graph are drawn on top of the chart.
452 this.graphDiv
.appendChild(this.hidden_
);
453 this.graphDiv
.appendChild(this.canvas_
);
454 this.mouseEventElement_
= this.canvas_
;
456 // Make sure we don't overdraw.
457 Dygraph
.clipCanvas_(this.hidden_
, this.clippingArea_
);
458 Dygraph
.clipCanvas_(this.canvas_
, this.clippingArea_
);
461 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(e
) {
462 dygraph
.mouseMove_(e
);
464 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(e
) {
465 dygraph
.mouseOut_(e
);
468 // Create the grapher
469 // TODO(danvk): why does the Layout need its own set of options?
470 this.layoutOptions_
= { 'xOriginIsZero': false };
471 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
472 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
473 Dygraph
.update(this.layoutOptions_
, {
474 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) });
476 this.layout_
= new DygraphLayout(this, this.layoutOptions_
);
478 // TODO(danvk): why does the Renderer need its own set of options?
479 this.renderOptions_
= { colorScheme
: this.colors_
,
481 axisLineWidth
: Dygraph
.AXIS_LINE_WIDTH
};
482 Dygraph
.update(this.renderOptions_
, this.attrs_
);
483 Dygraph
.update(this.renderOptions_
, this.user_attrs_
);
484 this.plotter_
= new DygraphCanvasRenderer(this,
485 this.hidden_
, this.layout_
,
486 this.renderOptions_
);
488 this.createStatusMessage_();
489 this.createRollInterface_();
490 this.createDragInterface_();
494 * Detach DOM elements in the dygraph and null out all data references.
495 * Calling this when you're done with a dygraph can dramatically reduce memory
496 * usage. See, e.g., the tests/perf.html example.
498 Dygraph
.prototype.destroy
= function() {
499 var removeRecursive
= function(node
) {
500 while (node
.hasChildNodes()) {
501 removeRecursive(node
.firstChild
);
502 node
.removeChild(node
.firstChild
);
505 removeRecursive(this.maindiv_
);
507 var nullOut
= function(obj
) {
509 if (typeof(obj
[n
]) === 'object') {
515 // These may not all be necessary, but it can't hurt...
516 nullOut(this.layout_
);
517 nullOut(this.plotter_
);
522 * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on
523 * this particular canvas. All Dygraph work is done on this.canvas_.
524 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
525 * @return {Object} The newly-created canvas
528 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
529 var h
= Dygraph
.createCanvas();
530 h
.style
.position
= "absolute";
531 // TODO(danvk): h should be offset from canvas. canvas needs to include
532 // some extra area to make it easier to zoom in on the far left and far
533 // right. h needs to be precisely the plot area, so that clipping occurs.
534 h
.style
.top
= canvas
.style
.top
;
535 h
.style
.left
= canvas
.style
.left
;
536 h
.width
= this.width_
;
537 h
.height
= this.height_
;
538 h
.style
.width
= this.width_
+ "px"; // for IE
539 h
.style
.height
= this.height_
+ "px"; // for IE
543 // Taken from MochiKit.Color
544 Dygraph
.hsvToRGB
= function (hue
, saturation
, value
) {
548 if (saturation
=== 0) {
553 var i
= Math
.floor(hue
* 6);
554 var f
= (hue
* 6) - i
;
555 var p
= value
* (1 - saturation
);
556 var q
= value
* (1 - (saturation
* f
));
557 var t
= value
* (1 - (saturation
* (1 - f
)));
559 case 1: red
= q
; green
= value
; blue
= p
; break;
560 case 2: red
= p
; green
= value
; blue
= t
; break;
561 case 3: red
= p
; green
= q
; blue
= value
; break;
562 case 4: red
= t
; green
= p
; blue
= value
; break;
563 case 5: red
= value
; green
= p
; blue
= q
; break;
564 case 6: // fall through
565 case 0: red
= value
; green
= t
; blue
= p
; break;
568 red
= Math
.floor(255 * red
+ 0.5);
569 green
= Math
.floor(255 * green
+ 0.5);
570 blue
= Math
.floor(255 * blue
+ 0.5);
571 return 'rgb(' + red
+ ',' + green
+ ',' + blue
+ ')';
576 * Generate a set of distinct colors for the data series. This is done with a
577 * color wheel. Saturation/Value are customizable, and the hue is
578 * equally-spaced around the color wheel. If a custom set of colors is
579 * specified, that is used instead.
582 Dygraph
.prototype.setColors_
= function() {
583 // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do
584 // away with this.renderOptions_.
585 var num
= this.attr_("labels").length
- 1;
587 var colors
= this.attr_('colors');
589 var sat
= this.attr_('colorSaturation') || 1.0;
590 var val
= this.attr_('colorValue') || 0.5;
591 var half
= Math
.ceil(num
/ 2);
592 for (var i
= 1; i
<= num
; i
++) {
593 if (!this.visibility()[i
-1]) continue;
594 // alternate colors for high contrast.
595 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
596 var hue
= (1.0 * idx
/ (1 + num
));
597 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
600 for (var i
= 0; i
< num
; i
++) {
601 if (!this.visibility()[i
]) continue;
602 var colorStr
= colors
[i
% colors
.length
];
603 this.colors_
.push(colorStr
);
607 // TODO(danvk): update this w/r
/t/ the
new options system
.
608 this.renderOptions_
.colorScheme
= this.colors_
;
609 Dygraph
.update(this.plotter_
.options
, this.renderOptions_
);
610 Dygraph
.update(this.layoutOptions_
, this.user_attrs_
);
611 Dygraph
.update(this.layoutOptions_
, this.attrs_
);
615 * Return the list of colors. This is either the list of colors passed in the
616 * attributes, or the autogenerated list of rgb(r,g,b) strings.
617 * @return {Array<string>} The list of colors.
619 Dygraph
.prototype.getColors
= function() {
623 // The following functions are from quirksmode.org with a modification for Safari from
624 // http://blog.firetree.net/2005/07/04/javascript-find-position/
625 // http://www.quirksmode.org/js
/findpos
.html
626 Dygraph
.findPosX
= function(obj
) {
631 curleft
+= obj
.offsetLeft
;
632 if(!obj
.offsetParent
)
634 obj
= obj
.offsetParent
;
641 Dygraph
.findPosY
= function(obj
) {
646 curtop
+= obj
.offsetTop
;
647 if(!obj
.offsetParent
)
649 obj
= obj
.offsetParent
;
659 * Create the div that contains information on the selected point(s)
660 * This goes in the top right of the canvas, unless an external div has already
664 Dygraph
.prototype.createStatusMessage_
= function() {
665 var userLabelsDiv
= this.user_attrs_
["labelsDiv"];
666 if (userLabelsDiv
&& null != userLabelsDiv
667 && (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
668 this.user_attrs_
["labelsDiv"] = document
.getElementById(userLabelsDiv
);
670 if (!this.attr_("labelsDiv")) {
671 var divWidth
= this.attr_('labelsDivWidth');
673 "position": "absolute",
676 "width": divWidth
+ "px",
678 "left": (this.width_
- divWidth
- 2) + "px",
679 "background": "white",
681 "overflow": "hidden"};
682 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
683 var div
= document
.createElement("div");
684 for (var name
in messagestyle
) {
685 if (messagestyle
.hasOwnProperty(name
)) {
686 div
.style
[name
] = messagestyle
[name
];
689 this.graphDiv
.appendChild(div
);
690 this.attrs_
.labelsDiv
= div
;
695 * Create the text box to adjust the averaging period
696 * @return {Object} The newly-created text box
699 Dygraph
.prototype.createRollInterface_
= function() {
700 var display
= this.attr_('showRoller') ? "block" : "none";
701 var textAttr
= { "position": "absolute",
703 "top": (this.plotter_
.area
.h
- 25) + "px",
704 "left": (this.plotter_
.area
.x
+ 1) + "px",
707 var roller
= document
.createElement("input");
708 roller
.type
= "text";
710 roller
.value
= this.rollPeriod_
;
711 for (var name
in textAttr
) {
712 if (textAttr
.hasOwnProperty(name
)) {
713 roller
.style
[name
] = textAttr
[name
];
717 var pa
= this.graphDiv
;
718 pa
.appendChild(roller
);
720 roller
.onchange
= function() { dygraph
.adjustRoll(roller
.value
); };
724 // These functions are taken from MochiKit.Signal
725 Dygraph
.pageX
= function(e
) {
727 return (!e
.pageX
|| e
.pageX
< 0) ? 0 : e
.pageX
;
730 var b
= document
.body
;
732 (de
.scrollLeft
|| b
.scrollLeft
) -
733 (de
.clientLeft
|| 0);
737 Dygraph
.pageY
= function(e
) {
739 return (!e
.pageY
|| e
.pageY
< 0) ? 0 : e
.pageY
;
742 var b
= document
.body
;
744 (de
.scrollTop
|| b
.scrollTop
) -
750 * Set up all the mouse handlers needed to capture dragging behavior for zoom
754 Dygraph
.prototype.createDragInterface_
= function() {
757 // Tracks whether the mouse is down right now
758 var isZooming
= false;
759 var isPanning
= false;
760 var dragStartX
= null;
761 var dragStartY
= null;
766 var prevDragDirection
= null;
768 // draggingDate and draggingValue represent the [date,value] point on the
769 // graph at which the mouse was pressed. As the mouse moves while panning,
770 // the viewport must pan so that the mouse position points to
771 // [draggingDate, draggingValue]
772 var draggingDate
= null;
773 var draggingValue
= null;
775 // The range in second/value units that the viewport encompasses during a
776 // panning operation.
777 var dateRange
= null;
778 var valueRange
= null;
780 // Utility function to convert page-wide coordinates to canvas coords
783 var getX
= function(e
) { return Dygraph
.pageX(e
) - px
};
784 var getY
= function(e
) { return Dygraph
.pageY(e
) - py
};
786 // Draw zoom rectangles when the mouse is down and the user moves around
787 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(event
) {
789 dragEndX
= getX(event
);
790 dragEndY
= getY(event
);
792 var xDelta
= Math
.abs(dragStartX
- dragEndX
);
793 var yDelta
= Math
.abs(dragStartY
- dragEndY
);
795 // drag direction threshold for y axis is twice as large as x axis
796 var dragDirection
= (xDelta
< yDelta
/ 2) ? Dygraph
.VERTICAL
: Dygraph
.HORIZONTAL
;
798 self
.drawZoomRect_(dragDirection
, dragStartX
, dragEndX
, dragStartY
, dragEndY
,
799 prevDragDirection
, prevEndX
, prevEndY
);
803 prevDragDirection
= dragDirection
;
804 } else if (isPanning
) {
805 dragEndX
= getX(event
);
806 dragEndY
= getY(event
);
808 // Want to have it so that:
809 // 1. draggingDate appears at dragEndX, draggingValue appears at dragEndY.
810 // 2. daterange = (dateWindow_[1] - dateWindow_[0]) is unaltered.
811 // 3. draggingValue appears at dragEndY.
812 // 4. valueRange is unaltered.
814 var minDate
= draggingDate
- (dragEndX
/ self
.width_
) * dateRange
;
815 var maxDate
= minDate
+ dateRange
;
816 self
.dateWindow_
= [minDate
, maxDate
];
819 // y-axis scaling is automatic unless a valueRange is defiend or
820 // if the user zooms in on the y-axis. If neither is true, valueWindow
822 if (self
.valueWindow_
) {
823 var maxValue
= draggingValue
+ (dragEndY
/ self
.height_
) * valueRange
;
824 var minValue
= maxValue
- valueRange
;
825 self
.valueWindow_
= [ minValue
, maxValue
];
827 self
.drawGraph_(self
.rawData_
);
831 // Track the beginning of drag events
832 Dygraph
.addEvent(this.mouseEventElement_
, 'mousedown', function(event
) {
833 px
= Dygraph
.findPosX(self
.canvas_
);
834 py
= Dygraph
.findPosY(self
.canvas_
);
835 dragStartX
= getX(event
);
836 dragStartY
= getY(event
);
838 if (event
.altKey
|| event
.shiftKey
) {
839 // have to be zoomed in to pan.
840 if (!self
.dateWindow_
&& !self
.valueWindow_
) return;
843 var xRange
= self
.xAxisRange();
844 dateRange
= xRange
[1] - xRange
[0];
845 var yRange
= self
.yAxisRange();
846 valueRange
= yRange
[1] - yRange
[0];
848 // TODO(konigsberg): Switch from all this math to toDataCoords?
849 // Seems to work for the dragging value.
850 draggingDate
= (dragStartX
/ self
.width_
) * dateRange
+
852 var r
= self
.toDataCoords(null, dragStartY
);
853 draggingValue
= r
[1];
859 // If the user releases the mouse button during a drag, but not over the
860 // canvas, then it doesn't count as a zooming action.
861 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
862 if (isZooming
|| isPanning
) {
871 draggingValue
= null;
877 // Temporarily cancel the dragging event when the mouse leaves the graph
878 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(event
) {
885 // If the mouse is released on the canvas during a drag event, then it's a
886 // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels)
887 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseup', function(event
) {
890 dragEndX
= getX(event
);
891 dragEndY
= getY(event
);
892 var regionWidth
= Math
.abs(dragEndX
- dragStartX
);
893 var regionHeight
= Math
.abs(dragEndY
- dragStartY
);
895 if (regionWidth
< 2 && regionHeight
< 2 &&
896 self
.lastx_
!= undefined
&& self
.lastx_
!= -1) {
897 // TODO(danvk): pass along more info about the points, e.g. 'x'
898 if (self
.attr_('clickCallback') != null) {
899 self
.attr_('clickCallback')(event
, self
.lastx_
, self
.selPoints_
);
901 if (self
.attr_('pointClickCallback')) {
902 // check if the click was on a particular point.
904 var closestDistance
= 0;
905 for (var i
= 0; i
< self
.selPoints_
.length
; i
++) {
906 var p
= self
.selPoints_
[i
];
907 var distance
= Math
.pow(p
.canvasx
- dragEndX
, 2) +
908 Math
.pow(p
.canvasy
- dragEndY
, 2);
909 if (closestIdx
== -1 || distance
< closestDistance
) {
910 closestDistance
= distance
;
915 // Allow any click within two pixels of the dot.
916 var radius
= self
.attr_('highlightCircleSize') + 2;
917 if (closestDistance
<= 5 * 5) {
918 self
.attr_('pointClickCallback')(event
, self
.selPoints_
[closestIdx
]);
923 if (regionWidth
>= 10 && regionWidth
> regionHeight
) {
924 self
.doZoomX_(Math
.min(dragStartX
, dragEndX
),
925 Math
.max(dragStartX
, dragEndX
));
926 } else if (regionHeight
>= 10 && regionHeight
> regionWidth
){
927 self
.doZoomY_(Math
.min(dragStartY
, dragEndY
),
928 Math
.max(dragStartY
, dragEndY
));
930 self
.canvas_
.getContext("2d").clearRect(0, 0,
932 self
.canvas_
.height
);
942 draggingValue
= null;
948 // Double-clicking zooms back out
949 Dygraph
.addEvent(this.mouseEventElement_
, 'dblclick', function(event
) {
950 // Disable zooming out if panning.
951 if (event
.altKey
|| event
.shiftKey
) return;
958 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
959 * up any previous zoom rectangles that were drawn. This could be optimized to
960 * avoid extra redrawing, but it's tricky to avoid interactions with the status
963 * @param {Number} direction the direction of the zoom rectangle. Acceptable
964 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
965 * @param {Number} startX The X position where the drag started, in canvas
967 * @param {Number} endX The current X position of the drag, in canvas coords.
968 * @param {Number} startY The Y position where the drag started, in canvas
970 * @param {Number} endY The current Y position of the drag, in canvas coords.
971 * @param {Number} prevDirection the value of direction on the previous call to
972 * this function. Used to avoid excess redrawing
973 * @param {Number} prevEndX The value of endX on the previous call to this
974 * function. Used to avoid excess redrawing
975 * @param {Number} prevEndY The value of endY on the previous call to this
976 * function. Used to avoid excess redrawing
979 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
, endY
,
980 prevDirection
, prevEndX
, prevEndY
) {
981 var ctx
= this.canvas_
.getContext("2d");
983 // Clean up from the previous rect if necessary
984 if (prevDirection
== Dygraph
.HORIZONTAL
) {
985 ctx
.clearRect(Math
.min(startX
, prevEndX
), 0,
986 Math
.abs(startX
- prevEndX
), this.height_
);
987 } else if (prevDirection
== Dygraph
.VERTICAL
){
988 ctx
.clearRect(0, Math
.min(startY
, prevEndY
),
989 this.width_
, Math
.abs(startY
- prevEndY
));
992 // Draw a light-grey rectangle to show the new viewing area
993 if (direction
== Dygraph
.HORIZONTAL
) {
994 if (endX
&& startX
) {
995 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
996 ctx
.fillRect(Math
.min(startX
, endX
), 0,
997 Math
.abs(endX
- startX
), this.height_
);
1000 if (direction
== Dygraph
.VERTICAL
) {
1001 if (endY
&& startY
) {
1002 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1003 ctx
.fillRect(0, Math
.min(startY
, endY
),
1004 this.width_
, Math
.abs(endY
- startY
));
1010 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1011 * the canvas. The exact zoom window may be slightly larger if there are no data
1012 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1013 * which accepts dates that match the raw data. This function redraws the graph.
1015 * @param {Number} lowX The leftmost pixel value that should be visible.
1016 * @param {Number} highX The rightmost pixel value that should be visible.
1019 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1020 // Find the earliest and latest dates contained in this canvasx range.
1021 // Convert the call to date ranges of the raw data.
1022 var r
= this.toDataCoords(lowX
, null);
1024 r
= this.toDataCoords(highX
, null);
1026 this.doZoomXDates_(minDate
, maxDate
);
1030 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1031 * method with doZoomX which accepts pixel coordinates. This function redraws
1034 * @param {Number} minDate The minimum date that should be visible.
1035 * @param {Number} maxDate The maximum date that should be visible.
1038 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1039 this.dateWindow_
= [minDate
, maxDate
];
1040 this.drawGraph_(this.rawData_
);
1041 if (this.attr_("zoomCallback")) {
1042 var yRange
= this.yAxisRange();
1043 this.attr_("zoomCallback")(minDate
, maxDate
, yRange
[0], yRange
[1]);
1048 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1049 * the canvas. The exact zoom window may be slightly larger if there are no
1050 * data points near lowY or highY. Don't confuse this function with
1051 * doZoomYValues, which accepts parameters that match the raw data. This
1052 * function redraws the graph.
1054 * @param {Number} lowY The topmost pixel value that should be visible.
1055 * @param {Number} highY The lowest pixel value that should be visible.
1058 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1059 // Find the highest and lowest values in pixel range.
1060 var r
= this.toDataCoords(null, lowY
);
1061 var maxValue
= r
[1];
1062 r
= this.toDataCoords(null, highY
);
1063 var minValue
= r
[1];
1065 this.doZoomYValues_(minValue
, maxValue
);
1069 * Zoom to something containing [minValue, maxValue] values. Don't confuse this
1070 * method with doZoomY which accepts pixel coordinates. This function redraws
1073 * @param {Number} minValue The minimum Value that should be visible.
1074 * @param {Number} maxValue The maximum value that should be visible.
1077 Dygraph
.prototype.doZoomYValues_
= function(minValue
, maxValue
) {
1078 this.valueWindow_
= [minValue
, maxValue
];
1079 this.drawGraph_(this.rawData_
);
1080 if (this.attr_("zoomCallback")) {
1081 var xRange
= this.xAxisRange();
1082 this.attr_("zoomCallback")(xRange
[0], xRange
[1], minValue
, maxValue
);
1087 * Reset the zoom to the original view coordinates. This is the same as
1088 * double-clicking on the graph.
1092 Dygraph
.prototype.doUnzoom_
= function() {
1094 if (this.dateWindow_
!= null) {
1096 this.dateWindow_
= null;
1098 if (this.valueWindow_
!= null) {
1100 this.valueWindow_
= this.valueRange_
;
1104 // Putting the drawing operation before the callback because it resets
1106 this.drawGraph_(this.rawData_
);
1107 if (this.attr_("zoomCallback")) {
1108 var minDate
= this.rawData_
[0][0];
1109 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1110 var minValue
= this.yAxisRange()[0];
1111 var maxValue
= this.yAxisRange()[1];
1112 this.attr_("zoomCallback")(minDate
, maxDate
, minValue
, maxValue
);
1118 * When the mouse moves in the canvas, display information about a nearby data
1119 * point and draw dots over those points in the data series. This function
1120 * takes care of cleanup of previously-drawn dots.
1121 * @param {Object} event The mousemove event from the browser.
1124 Dygraph
.prototype.mouseMove_
= function(event
) {
1125 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1126 var points
= this.layout_
.points
;
1131 // Loop through all the points and find the date nearest to our current
1133 var minDist
= 1e+100;
1135 for (var i
= 0; i
< points
.length
; i
++) {
1136 var dist
= Math
.abs(points
[i
].canvasx
- canvasx
);
1137 if (dist
> minDist
) continue;
1141 if (idx
>= 0) lastx
= points
[idx
].xval
;
1142 // Check that you can really highlight the last day's data
1143 if (canvasx
> points
[points
.length
-1].canvasx
)
1144 lastx
= points
[points
.length
-1].xval
;
1146 // Extract the points we've selected
1147 this.selPoints_
= [];
1148 var l
= points
.length
;
1149 if (!this.attr_("stackedGraph")) {
1150 for (var i
= 0; i
< l
; i
++) {
1151 if (points
[i
].xval
== lastx
) {
1152 this.selPoints_
.push(points
[i
]);
1156 // Need to 'unstack' points starting from the bottom
1157 var cumulative_sum
= 0;
1158 for (var i
= l
- 1; i
>= 0; i
--) {
1159 if (points
[i
].xval
== lastx
) {
1160 var p
= {}; // Clone the point since we modify it
1161 for (var k
in points
[i
]) {
1162 p
[k
] = points
[i
][k
];
1164 p
.yval
-= cumulative_sum
;
1165 cumulative_sum
+= p
.yval
;
1166 this.selPoints_
.push(p
);
1169 this.selPoints_
.reverse();
1172 if (this.attr_("highlightCallback")) {
1173 var px
= this.lastx_
;
1174 if (px
!== null && lastx
!= px
) {
1175 // only fire if the selected point has changed.
1176 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
);
1180 // Save last x position for callbacks.
1181 this.lastx_
= lastx
;
1183 this.updateSelection_();
1187 * Draw dots over the selectied points in the data series. This function
1188 * takes care of cleanup of previously-drawn dots.
1191 Dygraph
.prototype.updateSelection_
= function() {
1192 // Clear the previously drawn vertical, if there is one
1193 var ctx
= this.canvas_
.getContext("2d");
1194 if (this.previousVerticalX_
>= 0) {
1195 // Determine the maximum highlight circle size.
1196 var maxCircleSize
= 0;
1197 var labels
= this.attr_('labels');
1198 for (var i
= 1; i
< labels
.length
; i
++) {
1199 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1200 if (r
> maxCircleSize
) maxCircleSize
= r
;
1202 var px
= this.previousVerticalX_
;
1203 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1204 2 * maxCircleSize
+ 2, this.height_
);
1207 var isOK
= function(x
) { return x
&& !isNaN(x
); };
1209 if (this.selPoints_
.length
> 0) {
1210 var canvasx
= this.selPoints_
[0].canvasx
;
1212 // Set the status message to indicate the selected point(s)
1213 var replace
= this.attr_('xValueFormatter')(this.lastx_
, this) + ":";
1214 var fmtFunc
= this.attr_('yValueFormatter');
1215 var clen
= this.colors_
.length
;
1217 if (this.attr_('showLabelsOnHighlight')) {
1218 // Set the status message to indicate the selected point(s)
1219 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1220 if (!this.attr_("labelsShowZeroValues") && this.selPoints_
[i
].yval
== 0) continue;
1221 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1222 if (this.attr_("labelsSeparateLines")) {
1225 var point
= this.selPoints_
[i
];
1226 var c
= new RGBColor(this.colors_
[i
%clen
]);
1227 var yval
= fmtFunc(point
.yval
);
1228 replace
+= " <b><font color='" + c
.toHex() + "'>"
1229 + point
.name
+ "</font></b>:"
1233 this.attr_("labelsDiv").innerHTML
= replace
;
1236 // Draw colored circles over the center of each selected point
1238 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1239 if (!isOK(this.selPoints_
[i
].canvasy
)) continue;
1241 this.attr_('highlightCircleSize', this.selPoints_
[i
].name
);
1243 ctx
.fillStyle
= this.plotter_
.colors
[this.selPoints_
[i
].name
];
1244 ctx
.arc(canvasx
, this.selPoints_
[i
].canvasy
, circleSize
,
1245 0, 2 * Math
.PI
, false);
1250 this.previousVerticalX_
= canvasx
;
1255 * Set manually set selected dots, and display information about them
1256 * @param int row number that should by highlighted
1257 * false value clears the selection
1260 Dygraph
.prototype.setSelection
= function(row
) {
1261 // Extract the points we've selected
1262 this.selPoints_
= [];
1265 if (row
!== false) {
1266 row
= row
-this.boundaryIds_
[0][0];
1269 if (row
!== false && row
>= 0) {
1270 for (var i
in this.layout_
.datasets
) {
1271 if (row
< this.layout_
.datasets
[i
].length
) {
1272 var point
= this.layout_
.points
[pos
+row
];
1274 if (this.attr_("stackedGraph")) {
1275 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1278 this.selPoints_
.push(point
);
1280 pos
+= this.layout_
.datasets
[i
].length
;
1284 if (this.selPoints_
.length
) {
1285 this.lastx_
= this.selPoints_
[0].xval
;
1286 this.updateSelection_();
1289 this.clearSelection();
1295 * The mouse has left the canvas. Clear out whatever artifacts remain
1296 * @param {Object} event the mouseout event from the browser.
1299 Dygraph
.prototype.mouseOut_
= function(event
) {
1300 if (this.attr_("unhighlightCallback")) {
1301 this.attr_("unhighlightCallback")(event
);
1304 if (this.attr_("hideOverlayOnMouseOut")) {
1305 this.clearSelection();
1310 * Remove all selection from the canvas
1313 Dygraph
.prototype.clearSelection
= function() {
1314 // Get rid of the overlay data
1315 var ctx
= this.canvas_
.getContext("2d");
1316 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1317 this.attr_("labelsDiv").innerHTML
= "";
1318 this.selPoints_
= [];
1323 * Returns the number of the currently selected row
1324 * @return int row number, of -1 if nothing is selected
1327 Dygraph
.prototype.getSelection
= function() {
1328 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1332 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1333 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1334 return row
+ this.boundaryIds_
[0][0];
1340 Dygraph
.zeropad
= function(x
) {
1341 if (x
< 10) return "0" + x
; else return "" + x
;
1345 * Return a string version of the hours, minutes and seconds portion of a date.
1346 * @param {Number} date The JavaScript date (ms since epoch)
1347 * @return {String} A time of the form "HH:MM:SS"
1350 Dygraph
.hmsString_
= function(date
) {
1351 var zeropad
= Dygraph
.zeropad
;
1352 var d
= new Date(date
);
1353 if (d
.getSeconds()) {
1354 return zeropad(d
.getHours()) + ":" +
1355 zeropad(d
.getMinutes()) + ":" +
1356 zeropad(d
.getSeconds());
1358 return zeropad(d
.getHours()) + ":" + zeropad(d
.getMinutes());
1363 * Convert a JS date to a string appropriate to display on an axis that
1364 * is displaying values at the stated granularity.
1365 * @param {Date} date The date to format
1366 * @param {Number} granularity One of the Dygraph granularity constants
1367 * @return {String} The formatted date
1370 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1371 if (granularity
>= Dygraph
.MONTHLY
) {
1372 return date
.strftime('%b %y');
1374 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1375 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1376 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1378 return Dygraph
.hmsString_(date
.getTime());
1384 * Convert a JS date (millis since epoch) to YYYY/MM/DD
1385 * @param {Number} date The JavaScript date (ms since epoch)
1386 * @return {String} A date of the form "YYYY/MM/DD"
1389 Dygraph
.dateString_
= function(date
, self
) {
1390 var zeropad
= Dygraph
.zeropad
;
1391 var d
= new Date(date
);
1394 var year
= "" + d
.getFullYear();
1395 // Get a 0 padded month string
1396 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
1397 // Get a 0 padded day string
1398 var day
= zeropad(d
.getDate());
1401 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
1402 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
1404 return year
+ "/" + month + "/" + day
+ ret
;
1408 * Round a number to the specified number of digits past the decimal point.
1409 * @param {Number} num The number to round
1410 * @param {Number} places The number of decimals to which to round
1411 * @return {Number} The rounded number
1414 Dygraph
.round_
= function(num
, places
) {
1415 var shift
= Math
.pow(10, places
);
1416 return Math
.round(num
* shift
)/shift
;
1420 * Fires when there's data available to be graphed.
1421 * @param {String} data Raw CSV data to be plotted
1424 Dygraph
.prototype.loadedEvent_
= function(data
) {
1425 this.rawData_
= this.parseCSV_(data
);
1426 this.drawGraph_(this.rawData_
);
1429 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1430 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1431 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1434 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1437 Dygraph
.prototype.addXTicks_
= function() {
1438 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1439 var startDate
, endDate
;
1440 if (this.dateWindow_
) {
1441 startDate
= this.dateWindow_
[0];
1442 endDate
= this.dateWindow_
[1];
1444 startDate
= this.rawData_
[0][0];
1445 endDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1448 var xTicks
= this.attr_('xTicker')(startDate
, endDate
, this);
1449 this.layout_
.updateOptions({xTicks
: xTicks
});
1452 // Time granularity enumeration
1453 Dygraph
.SECONDLY
= 0;
1454 Dygraph
.TWO_SECONDLY
= 1;
1455 Dygraph
.FIVE_SECONDLY
= 2;
1456 Dygraph
.TEN_SECONDLY
= 3;
1457 Dygraph
.THIRTY_SECONDLY
= 4;
1458 Dygraph
.MINUTELY
= 5;
1459 Dygraph
.TWO_MINUTELY
= 6;
1460 Dygraph
.FIVE_MINUTELY
= 7;
1461 Dygraph
.TEN_MINUTELY
= 8;
1462 Dygraph
.THIRTY_MINUTELY
= 9;
1463 Dygraph
.HOURLY
= 10;
1464 Dygraph
.TWO_HOURLY
= 11;
1465 Dygraph
.SIX_HOURLY
= 12;
1467 Dygraph
.WEEKLY
= 14;
1468 Dygraph
.MONTHLY
= 15;
1469 Dygraph
.QUARTERLY
= 16;
1470 Dygraph
.BIANNUAL
= 17;
1471 Dygraph
.ANNUAL
= 18;
1472 Dygraph
.DECADAL
= 19;
1473 Dygraph
.NUM_GRANULARITIES
= 20;
1475 Dygraph
.SHORT_SPACINGS
= [];
1476 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1477 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1478 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1479 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1480 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1481 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1482 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1483 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1484 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1485 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1486 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1487 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1488 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1489 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1490 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1494 // If we used this time granularity, how many ticks would there be?
1495 // This is only an approximation, but it's generally good enough.
1497 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1498 if (granularity
< Dygraph
.MONTHLY
) {
1499 // Generate one tick mark for every fixed interval of time.
1500 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1501 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1503 var year_mod
= 1; // e.g. to only print one point every 10 years.
1504 var num_months
= 12;
1505 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1506 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1507 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1508 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1510 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1511 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1512 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1518 // Construct an x-axis of nicely-formatted times on meaningful boundaries
1519 // (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1521 // Returns an array containing {v: millis, label: label} dictionaries.
1523 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1524 var formatter
= this.attr_("xAxisLabelFormatter");
1526 if (granularity
< Dygraph
.MONTHLY
) {
1527 // Generate one tick mark for every fixed interval of time.
1528 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1529 var format
= '%d%b'; // e.g. "1Jan"
1531 // Find a time less than start_time which occurs on a "nice" time boundary
1532 // for this granularity.
1533 var g
= spacing
/ 1000;
1534 var d
= new Date(start_time
);
1535 if (g
<= 60) { // seconds
1536 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1540 if (g
<= 60) { // minutes
1541 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1546 if (g
<= 24) { // days
1547 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1552 if (g
== 7) { // one week
1553 d
.setDate(d
.getDate() - d
.getDay());
1558 start_time
= d
.getTime();
1560 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1561 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1564 // Display a tick mark on the first of a set of months of each year.
1565 // Years get a tick mark iff y % year_mod == 0. This is useful for
1566 // displaying a tick mark once every 10 years, say, on long time scales.
1568 var year_mod
= 1; // e.g. to only print one point every 10 years.
1570 if (granularity
== Dygraph
.MONTHLY
) {
1571 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1572 } else if (granularity
== Dygraph
.QUARTERLY
) {
1573 months
= [ 0, 3, 6, 9 ];
1574 } else if (granularity
== Dygraph
.BIANNUAL
) {
1576 } else if (granularity
== Dygraph
.ANNUAL
) {
1578 } else if (granularity
== Dygraph
.DECADAL
) {
1583 var start_year
= new Date(start_time
).getFullYear();
1584 var end_year
= new Date(end_time
).getFullYear();
1585 var zeropad
= Dygraph
.zeropad
;
1586 for (var i
= start_year
; i
<= end_year
; i
++) {
1587 if (i
% year_mod
!= 0) continue;
1588 for (var j
= 0; j
< months
.length
; j
++) {
1589 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1590 var t
= Date
.parse(date_str
);
1591 if (t
< start_time
|| t
> end_time
) continue;
1592 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1602 * Add ticks to the x-axis based on a date range.
1603 * @param {Number} startDate Start of the date window (millis since epoch)
1604 * @param {Number} endDate End of the date window (millis since epoch)
1605 * @return {Array.<Object>} Array of {label, value} tuples.
1608 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1610 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1611 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1612 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1619 return self
.GetXAxis(startDate
, endDate
, chosen
);
1621 // TODO(danvk): signal error.
1626 * Add ticks when the x axis has numbers on it (instead of dates)
1627 * @param {Number} startDate Start of the date window (millis since epoch)
1628 * @param {Number} endDate End of the date window (millis since epoch)
1629 * @return {Array.<Object>} Array of {label, value} tuples.
1632 Dygraph
.numericTicks
= function(minV
, maxV
, self
) {
1634 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1635 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1636 // The first spacing greater than pixelsPerYLabel is what we use.
1637 // TODO(danvk): version that works on a log scale.
1638 if (self
.attr_("labelsKMG2")) {
1639 var mults
= [1, 2, 4, 8];
1641 var mults
= [1, 2, 5];
1643 var scale
, low_val
, high_val
, nTicks
;
1644 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1645 var pixelsPerTick
= self
.attr_('pixelsPerYLabel');
1646 for (var i
= -10; i
< 50; i
++) {
1647 if (self
.attr_("labelsKMG2")) {
1648 var base_scale
= Math
.pow(16, i
);
1650 var base_scale
= Math
.pow(10, i
);
1652 for (var j
= 0; j
< mults
.length
; j
++) {
1653 scale
= base_scale
* mults
[j
];
1654 low_val
= Math
.floor(minV
/ scale
) * scale
;
1655 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1656 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
1657 var spacing
= self
.height_
/ nTicks
;
1658 // wish I could break out of both loops at once...
1659 if (spacing
> pixelsPerTick
) break;
1661 if (spacing
> pixelsPerTick
) break;
1664 // Construct labels for the ticks
1668 if (self
.attr_("labelsKMB")) {
1670 k_labels
= [ "K", "M", "B", "T" ];
1672 if (self
.attr_("labelsKMG2")) {
1673 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1675 k_labels
= [ "k", "M", "G", "T" ];
1678 // Allow reverse y-axis if it's explicitly requested.
1679 if (low_val
> high_val
) scale
*= -1;
1681 for (var i
= 0; i
< nTicks
; i
++) {
1682 var tickV
= low_val
+ i
* scale
;
1683 var absTickV
= Math
.abs(tickV
);
1684 var label
= Dygraph
.round_(tickV
, 2);
1685 if (k_labels
.length
) {
1686 // Round up to an appropriate unit.
1688 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
1689 if (absTickV
>= n
) {
1690 label
= Dygraph
.round_(tickV
/ n
, 1) + k_labels
[j
];
1695 ticks
.push( {label
: label
, v
: tickV
} );
1701 * Adds appropriate ticks on the y-axis
1702 * @param {Number} minY The minimum Y value in the data set
1703 * @param {Number} maxY The maximum Y value in the data set
1706 Dygraph
.prototype.addYTicks_
= function(minY
, maxY
) {
1707 // Set the number of ticks so that the labels are human-friendly.
1708 // TODO(danvk): make this an attribute as well.
1709 var ticks
= Dygraph
.numericTicks(minY
, maxY
, this);
1710 this.layout_
.updateOptions( { yAxis
: [minY
, maxY
],
1714 // Computes the range of the data series (including confidence intervals).
1715 // series is either [ [x1, y1], [x2, y2], ... ] or
1716 // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1717 // Returns [low, high]
1718 Dygraph
.prototype.extremeValues_
= function(series
) {
1719 var minY
= null, maxY
= null;
1721 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1723 // With custom bars, maxY is the max of the high values.
1724 for (var j
= 0; j
< series
.length
; j
++) {
1725 var y
= series
[j
][1][0];
1727 var low
= y
- series
[j
][1][1];
1728 var high
= y
+ series
[j
][1][2];
1729 if (low
> y
) low
= y
; // this can happen with custom bars,
1730 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1731 if (maxY
== null || high
> maxY
) {
1734 if (minY
== null || low
< minY
) {
1739 for (var j
= 0; j
< series
.length
; j
++) {
1740 var y
= series
[j
][1];
1741 if (y
=== null || isNaN(y
)) continue;
1742 if (maxY
== null || y
> maxY
) {
1745 if (minY
== null || y
< minY
) {
1751 return [minY
, maxY
];
1755 * Update the graph with new data. Data is in the format
1756 * [ [date1, val1, val2, ...], [date2, val1, val2, ...] if errorBars=false
1757 * or, if errorBars=true,
1758 * [ [date1, [val1,stddev1], [val2,stddev2], ...], [date2, ...], ...]
1759 * @param {Array.<Object>} data The data (see above)
1762 Dygraph
.prototype.drawGraph_
= function(data
) {
1763 // This is used to set the second parameter to drawCallback, below.
1764 var is_initial_draw
= this.is_initial_draw_
;
1765 this.is_initial_draw_
= false;
1767 var minY
= null, maxY
= null;
1768 this.layout_
.removeAllDatasets();
1770 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
1772 // Loop over the fields (series). Go from the last to the first,
1773 // because if they're stacked that's how we accumulate the values.
1775 var cumulative_y
= []; // For stacked series.
1778 // Loop over all fields and create datasets
1779 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
1780 if (!this.visibility()[i
- 1]) continue;
1782 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
1785 for (var j
= 0; j
< data
.length
; j
++) {
1786 if (data
[j
][i
] != null || !connectSeparatedPoints
) {
1787 var date
= data
[j
][0];
1788 series
.push([date
, data
[j
][i
]]);
1791 series
= this.rollingAverage(series
, this.rollPeriod_
);
1793 // Prune down to the desired range, if necessary (for zooming)
1794 // Because there can be lines going to points outside of the visible area,
1795 // we actually prune to visible points, plus one on either side.
1796 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1797 if (this.dateWindow_
) {
1798 var low
= this.dateWindow_
[0];
1799 var high
= this.dateWindow_
[1];
1801 // TODO(danvk): do binary search instead of linear search.
1802 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1803 var firstIdx
= null, lastIdx
= null;
1804 for (var k
= 0; k
< series
.length
; k
++) {
1805 if (series
[k
][0] >= low
&& firstIdx
=== null) {
1808 if (series
[k
][0] <= high
) {
1812 if (firstIdx
=== null) firstIdx
= 0;
1813 if (firstIdx
> 0) firstIdx
--;
1814 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
1815 if (lastIdx
< series
.length
- 1) lastIdx
++;
1816 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
1817 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
1818 pruned
.push(series
[k
]);
1822 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
1825 var extremes
= this.extremeValues_(series
);
1826 var thisMinY
= extremes
[0];
1827 var thisMaxY
= extremes
[1];
1828 if (minY
=== null || thisMinY
< minY
) minY
= thisMinY
;
1829 if (maxY
=== null || thisMaxY
> maxY
) maxY
= thisMaxY
;
1832 for (var j
=0; j
<series
.length
; j
++) {
1833 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
1836 } else if (this.attr_("stackedGraph")) {
1837 var l
= series
.length
;
1839 for (var j
= 0; j
< l
; j
++) {
1840 // If one data set has a NaN, let all subsequent stacked
1841 // sets inherit the NaN -- only start at 0 for the first set.
1842 var x
= series
[j
][0];
1843 if (cumulative_y
[x
] === undefined
)
1844 cumulative_y
[x
] = 0;
1846 actual_y
= series
[j
][1];
1847 cumulative_y
[x
] += actual_y
;
1849 series
[j
] = [x
, cumulative_y
[x
]]
1851 if (!maxY
|| cumulative_y
[x
] > maxY
)
1852 maxY
= cumulative_y
[x
];
1856 datasets
[i
] = series
;
1859 for (var i
= 1; i
< datasets
.length
; i
++) {
1860 if (!this.visibility()[i
- 1]) continue;
1861 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
1864 // Use some heuristics to come up with a good maxY value, unless it's been
1865 // set explicitly by the developer or end-user (via drag)
1866 if (this.valueWindow_
!= null) {
1867 this.addYTicks_(this.valueWindow_
[0], this.valueWindow_
[1]);
1868 this.displayedYRange_
= this.valueWindow_
;
1870 // This affects the calculation of span, below.
1871 if (this.attr_("includeZero") && minY
> 0) {
1875 // Add some padding and round up to an integer to be human-friendly.
1876 var span
= maxY
- minY
;
1877 // special case: if we have no sense of scale, use +/-10% of the sole value
.
1878 if (span
== 0) { span
= maxY
; }
1879 var maxAxisY
= maxY
+ 0.1 * span
;
1880 var minAxisY
= minY
- 0.1 * span
;
1882 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
1883 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
1884 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
1886 if (this.attr_("includeZero")) {
1887 if (maxY
< 0) maxAxisY
= 0;
1888 if (minY
> 0) minAxisY
= 0;
1891 this.addYTicks_(minAxisY
, maxAxisY
);
1892 this.displayedYRange_
= [minAxisY
, maxAxisY
];
1897 // Tell PlotKit to use this new data and render itself
1898 this.layout_
.updateOptions({dateWindow
: this.dateWindow_
});
1899 this.layout_
.evaluateWithError();
1900 this.plotter_
.clear();
1901 this.plotter_
.render();
1902 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
1903 this.canvas_
.height
);
1905 if (this.attr_("drawCallback") !== null) {
1906 this.attr_("drawCallback")(this, is_initial_draw
);
1911 * Calculates the rolling average of a data set.
1912 * If originalData is [label, val], rolls the average of those.
1913 * If originalData is [label, [, it's interpreted as [value, stddev]
1914 * and the roll is returned in the same form, with appropriately reduced
1915 * stddev for each value.
1916 * Note that this is where fractional input (i.e. '5/10') is converted into
1918 * @param {Array} originalData The data in the appropriate format (see above)
1919 * @param {Number} rollPeriod The number of days over which to average the data
1921 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
1922 if (originalData
.length
< 2)
1923 return originalData
;
1924 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
1925 var rollingData
= [];
1926 var sigma
= this.attr_("sigma");
1928 if (this.fractions_
) {
1930 var den
= 0; // numerator/denominator
1932 for (var i
= 0; i
< originalData
.length
; i
++) {
1933 num
+= originalData
[i
][1][0];
1934 den
+= originalData
[i
][1][1];
1935 if (i
- rollPeriod
>= 0) {
1936 num
-= originalData
[i
- rollPeriod
][1][0];
1937 den
-= originalData
[i
- rollPeriod
][1][1];
1940 var date
= originalData
[i
][0];
1941 var value
= den
? num
/ den
: 0.0;
1942 if (this.attr_("errorBars")) {
1943 if (this.wilsonInterval_
) {
1944 // For more details on this confidence interval, see:
1945 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
1947 var p
= value
< 0 ? 0 : value
, n
= den
;
1948 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
1949 var denom
= 1 + sigma
* sigma
/ den
;
1950 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
1951 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
1952 rollingData
[i
] = [date
,
1953 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
1955 rollingData
[i
] = [date
, [0, 0, 0]];
1958 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
1959 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
1962 rollingData
[i
] = [date
, mult
* value
];
1965 } else if (this.attr_("customBars")) {
1970 for (var i
= 0; i
< originalData
.length
; i
++) {
1971 var data
= originalData
[i
][1];
1973 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
1975 if (y
!= null && !isNaN(y
)) {
1981 if (i
- rollPeriod
>= 0) {
1982 var prev
= originalData
[i
- rollPeriod
];
1983 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
1990 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
1991 1.0 * (mid
- low
) / count
,
1992 1.0 * (high
- mid
) / count
]];
1995 // Calculate the rolling average for the first rollPeriod - 1 points where
1996 // there is not enough data to roll over the full number of days
1997 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
1998 if (!this.attr_("errorBars")){
1999 if (rollPeriod
== 1) {
2000 return originalData
;
2003 for (var i
= 0; i
< originalData
.length
; i
++) {
2006 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2007 var y
= originalData
[j
][1];
2008 if (y
== null || isNaN(y
)) continue;
2010 sum
+= originalData
[j
][1];
2013 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2015 rollingData
[i
] = [originalData
[i
][0], null];
2020 for (var i
= 0; i
< originalData
.length
; i
++) {
2024 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2025 var y
= originalData
[j
][1][0];
2026 if (y
== null || isNaN(y
)) continue;
2028 sum
+= originalData
[j
][1][0];
2029 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2032 var stddev
= Math
.sqrt(variance
) / num_ok
;
2033 rollingData
[i
] = [originalData
[i
][0],
2034 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2036 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2046 * Parses a date, returning the number of milliseconds since epoch. This can be
2047 * passed in as an xValueParser in the Dygraph constructor.
2048 * TODO(danvk): enumerate formats that this understands.
2049 * @param {String} A date in YYYYMMDD format.
2050 * @return {Number} Milliseconds since epoch.
2053 Dygraph
.dateParser
= function(dateStr
, self
) {
2056 if (dateStr
.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12'
2057 dateStrSlashed
= dateStr
.replace("-", "/", "g");
2058 while (dateStrSlashed
.search("-") != -1) {
2059 dateStrSlashed
= dateStrSlashed
.replace("-", "/");
2061 d
= Date
.parse(dateStrSlashed
);
2062 } else if (dateStr
.length
== 8) { // e.g. '20090712'
2063 // TODO(danvk): remove support for this format. It's confusing.
2064 dateStrSlashed
= dateStr
.substr(0,4) + "/" + dateStr
.substr(4,2)
2065 + "/" + dateStr
.substr(6,2);
2066 d
= Date
.parse(dateStrSlashed
);
2068 // Any format that Date.parse will accept, e.g. "2009/07/12" or
2069 // "2009/07/12 12:34:56"
2070 d
= Date
.parse(dateStr
);
2073 if (!d
|| isNaN(d
)) {
2074 self
.error("Couldn't parse " + dateStr
+ " as a date");
2080 * Detects the type of the str (date or numeric) and sets the various
2081 * formatting attributes in this.attrs_ based on this type.
2082 * @param {String} str An x value.
2085 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2087 if (str
.indexOf('-') >= 0 ||
2088 str
.indexOf('/') >= 0 ||
2089 isNaN(parseFloat(str
))) {
2091 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2092 // TODO(danvk): remove support for this format.
2097 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2098 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2099 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2100 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2102 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2103 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2104 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2105 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2110 * Parses a string in a special csv format. We expect a csv file where each
2111 * line is a date point, and the first field in each line is the date string.
2112 * We also expect that all remaining fields represent series.
2113 * if the errorBars attribute is set, then interpret the fields as:
2114 * date, series1, stddev1, series2, stddev2, ...
2115 * @param {Array.<Object>} data See above.
2118 * @return Array.<Object> An array with one entry for each row. These entries
2119 * are an array of cells in that row. The first entry is the parsed x-value for
2120 * the row. The second, third, etc. are the y-values. These can take on one of
2121 * three forms, depending on the CSV and constructor parameters:
2123 * 2. [ value, stddev ]
2124 * 3. [ low value, center value, high value ]
2126 Dygraph
.prototype.parseCSV_
= function(data
) {
2128 var lines
= data
.split("\n");
2130 // Use the default delimiter or fall back to a tab if that makes sense.
2131 var delim
= this.attr_('delimiter');
2132 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2137 if (this.labelsFromCSV_
) {
2139 this.attrs_
.labels
= lines
[0].split(delim
);
2142 // Parse the x as a float or return null if it's not a number.
2143 var parseFloatOrNull
= function(x
) {
2144 var val
= parseFloat(x
);
2145 return isNaN(val
) ? null : val
;
2149 var defaultParserSet
= false; // attempt to auto-detect x value type
2150 var expectedCols
= this.attr_("labels").length
;
2151 var outOfOrder
= false;
2152 for (var i
= start
; i
< lines
.length
; i
++) {
2153 var line
= lines
[i
];
2154 if (line
.length
== 0) continue; // skip blank lines
2155 if (line
[0] == '#') continue; // skip comment lines
2156 var inFields
= line
.split(delim
);
2157 if (inFields
.length
< 2) continue;
2160 if (!defaultParserSet
) {
2161 this.detectTypeFromString_(inFields
[0]);
2162 xParser
= this.attr_("xValueParser");
2163 defaultParserSet
= true;
2165 fields
[0] = xParser(inFields
[0], this);
2167 // If fractions are expected, parse the numbers as "A/B
"
2168 if (this.fractions_) {
2169 for (var j = 1; j < inFields.length; j++) {
2170 // TODO(danvk): figure out an appropriate way to flag parse errors.
2171 var vals = inFields[j].split("/");
2172 fields[j] = [parseFloatOrNull(vals[0]), parseFloatOrNull(vals[1])];
2174 } else if (this.attr_("errorBars
")) {
2175 // If there are error bars, values are (value, stddev) pairs
2176 for (var j = 1; j < inFields.length; j += 2)
2177 fields[(j + 1) / 2] = [parseFloatOrNull(inFields[j]),
2178 parseFloatOrNull(inFields[j + 1])];
2179 } else if (this.attr_("customBars
")) {
2180 // Bars are a low;center;high tuple
2181 for (var j = 1; j < inFields.length; j++) {
2182 var vals = inFields[j].split(";");
2183 fields[j] = [ parseFloatOrNull(vals[0]),
2184 parseFloatOrNull(vals[1]),
2185 parseFloatOrNull(vals[2]) ];
2188 // Values are just numbers
2189 for (var j = 1; j < inFields.length; j++) {
2190 fields[j] = parseFloatOrNull(inFields[j]);
2193 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2198 if (fields.length != expectedCols) {
2199 this.error("Number of columns
in line
" + i + " (" + fields.length +
2200 ") does not agree
with number of
labels (" + expectedCols +
2206 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2207 ret.sort(function(a,b) { return a[0] - b[0] });
2214 * The user has provided their data as a pre-packaged JS array. If the x values
2215 * are numeric, this is the same as dygraphs' internal format. If the x values
2216 * are dates, we need to convert them from Date objects to ms since epoch.
2217 * @param {Array.<Object>} data
2218 * @return {Array.<Object>} data with numeric x values.
2220 Dygraph.prototype.parseArray_ = function(data) {
2221 // Peek at the first x value to see if it's numeric.
2222 if (data.length == 0) {
2223 this.error("Can
't plot empty data set");
2226 if (data[0].length == 0) {
2227 this.error("Data set cannot contain an empty row");
2231 if (this.attr_("labels") == null) {
2232 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2233 "in the options parameter");
2234 this.attrs_.labels = [ "X" ];
2235 for (var i = 1; i < data[0].length; i++) {
2236 this.attrs_.labels.push("Y" + i);
2240 if (Dygraph.isDateLike(data[0][0])) {
2241 // Some intelligent defaults for a date x-axis.
2242 this.attrs_.xValueFormatter = Dygraph.dateString_;
2243 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
2244 this.attrs_.xTicker = Dygraph.dateTicker;
2246 // Assume they're all dates
.
2247 var parsedData
= Dygraph
.clone(data
);
2248 for (var i
= 0; i
< data
.length
; i
++) {
2249 if (parsedData
[i
].length
== 0) {
2250 this.error("Row " + (1 + i
) + " of data is empty");
2253 if (parsedData
[i
][0] == null
2254 || typeof(parsedData
[i
][0].getTime
) != 'function'
2255 || isNaN(parsedData
[i
][0].getTime())) {
2256 this.error("x value in row " + (1 + i
) + " is not a Date");
2259 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2263 // Some intelligent defaults for a numeric x-axis.
2264 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2265 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2271 * Parses a DataTable object from gviz.
2272 * The data is expected to have a first column that is either a date or a
2273 * number. All subsequent columns must be numbers. If there is a clear mismatch
2274 * between this.xValueParser_ and the type of the first column, it will be
2275 * fixed. Fills out rawData_.
2276 * @param {Array.<Object>} data See above.
2279 Dygraph
.prototype.parseDataTable_
= function(data
) {
2280 var cols
= data
.getNumberOfColumns();
2281 var rows
= data
.getNumberOfRows();
2283 var indepType
= data
.getColumnType(0);
2284 if (indepType
== 'date' || indepType
== 'datetime') {
2285 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2286 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2287 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2288 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2289 } else if (indepType
== 'number') {
2290 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2291 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2292 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2293 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2295 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2296 "column 1 of DataTable input (Got '" + indepType
+ "')");
2300 // Array of the column indices which contain data (and not annotations).
2302 var annotationCols
= {}; // data index -> [annotation cols]
2303 var hasAnnotations
= false;
2304 for (var i
= 1; i
< cols
; i
++) {
2305 var type
= data
.getColumnType(i
);
2306 if (type
== 'number') {
2308 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2309 // This is OK -- it's an annotation column.
2310 var dataIdx
= colIdx
[colIdx
.length
- 1];
2311 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2312 annotationCols
[dataIdx
] = [i
];
2314 annotationCols
[dataIdx
].push(i
);
2316 hasAnnotations
= true;
2318 this.error("Only 'number' is supported as a dependent type with Gviz." +
2319 " 'string' is only supported if displayAnnotations is true");
2323 // Read column labels
2324 // TODO(danvk): add support back for errorBars
2325 var labels
= [data
.getColumnLabel(0)];
2326 for (var i
= 0; i
< colIdx
.length
; i
++) {
2327 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2328 if (this.attr_("errorBars")) i
+= 1;
2330 this.attrs_
.labels
= labels
;
2331 cols
= labels
.length
;
2334 var outOfOrder
= false;
2335 var annotations
= [];
2336 for (var i
= 0; i
< rows
; i
++) {
2338 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2339 data
.getValue(i
, 0) === null) {
2340 this.warn("Ignoring row " + i
+
2341 " of DataTable because of undefined or null first column.");
2345 if (indepType
== 'date' || indepType
== 'datetime') {
2346 row
.push(data
.getValue(i
, 0).getTime());
2348 row
.push(data
.getValue(i
, 0));
2350 if (!this.attr_("errorBars")) {
2351 for (var j
= 0; j
< colIdx
.length
; j
++) {
2352 var col
= colIdx
[j
];
2353 row
.push(data
.getValue(i
, col
));
2354 if (hasAnnotations
&&
2355 annotationCols
.hasOwnProperty(col
) &&
2356 data
.getValue(i
, annotationCols
[col
][0]) != null) {
2358 ann
.series
= data
.getColumnLabel(col
);
2360 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
2362 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2363 if (k
) ann
.text
+= "\n";
2364 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2366 annotations
.push(ann
);
2370 for (var j
= 0; j
< cols
- 1; j
++) {
2371 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2374 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2381 this.warn("DataTable is out of order; order it correctly to speed loading.");
2382 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
2384 this.rawData_
= ret
;
2386 if (annotations
.length
> 0) {
2387 this.setAnnotations(annotations
, true);
2391 // These functions are all based on MochiKit.
2392 Dygraph
.update
= function (self
, o
) {
2393 if (typeof(o
) != 'undefined' && o
!== null) {
2395 if (o
.hasOwnProperty(k
)) {
2403 Dygraph
.isArrayLike
= function (o
) {
2404 var typ
= typeof(o
);
2406 (typ
!= 'object' && !(typ
== 'function' &&
2407 typeof(o
.item
) == 'function')) ||
2409 typeof(o
.length
) != 'number' ||
2417 Dygraph
.isDateLike
= function (o
) {
2418 if (typeof(o
) != "object" || o
=== null ||
2419 typeof(o
.getTime
) != 'function') {
2425 Dygraph
.clone
= function(o
) {
2426 // TODO(danvk): figure out how MochiKit's version works
2428 for (var i
= 0; i
< o
.length
; i
++) {
2429 if (Dygraph
.isArrayLike(o
[i
])) {
2430 r
.push(Dygraph
.clone(o
[i
]));
2440 * Get the CSV data. If it's in a function, call that function. If it's in a
2441 * file, do an XMLHttpRequest to get it.
2444 Dygraph
.prototype.start_
= function() {
2445 if (typeof this.file_
== 'function') {
2446 // CSV string. Pretend we got it via XHR.
2447 this.loadedEvent_(this.file_());
2448 } else if (Dygraph
.isArrayLike(this.file_
)) {
2449 this.rawData_
= this.parseArray_(this.file_
);
2450 this.drawGraph_(this.rawData_
);
2451 } else if (typeof this.file_
== 'object' &&
2452 typeof this.file_
.getColumnRange
== 'function') {
2453 // must be a DataTable from gviz.
2454 this.parseDataTable_(this.file_
);
2455 this.drawGraph_(this.rawData_
);
2456 } else if (typeof this.file_
== 'string') {
2457 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2458 if (this.file_
.indexOf('\n') >= 0) {
2459 this.loadedEvent_(this.file_
);
2461 var req
= new XMLHttpRequest();
2463 req
.onreadystatechange
= function () {
2464 if (req
.readyState
== 4) {
2465 if (req
.status
== 200) {
2466 caller
.loadedEvent_(req
.responseText
);
2471 req
.open("GET", this.file_
, true);
2475 this.error("Unknown data format: " + (typeof this.file_
));
2480 * Changes various properties of the graph. These can include:
2482 * <li>file: changes the source data for the graph</li>
2483 * <li>errorBars: changes whether the data contains stddev</li>
2485 * @param {Object} attrs The new properties and values
2487 Dygraph
.prototype.updateOptions
= function(attrs
) {
2488 // TODO(danvk): this is a mess. Rethink this function.
2489 if (attrs
.rollPeriod
) {
2490 this.rollPeriod_
= attrs
.rollPeriod
;
2492 if (attrs
.dateWindow
) {
2493 this.dateWindow_
= attrs
.dateWindow
;
2495 if (attrs
.valueRange
) {
2496 this.valueRange_
= attrs
.valueRange
;
2499 // TODO(danvk): validate per-series options.
2504 // highlightCircleSize
2506 Dygraph
.update(this.user_attrs_
, attrs
);
2507 Dygraph
.update(this.renderOptions_
, attrs
);
2509 this.labelsFromCSV_
= (this.attr_("labels") == null);
2511 // TODO(danvk): this doesn't match the constructor logic
2512 this.layout_
.updateOptions({ 'errorBars': this.attr_("errorBars") });
2513 if (attrs
['file']) {
2514 this.file_
= attrs
['file'];
2517 this.drawGraph_(this.rawData_
);
2522 * Resizes the dygraph. If no parameters are specified, resizes to fill the
2523 * containing div (which has presumably changed size since the dygraph was
2524 * instantiated. If the width/height are specified, the div will be resized.
2526 * This is far more efficient than destroying and re-instantiating a
2527 * Dygraph, since it doesn't have to reparse the underlying data.
2529 * @param {Number} width Width (in pixels)
2530 * @param {Number} height Height (in pixels)
2532 Dygraph
.prototype.resize
= function(width
, height
) {
2533 if (this.resize_lock
) {
2536 this.resize_lock
= true;
2538 if ((width
=== null) != (height
=== null)) {
2539 this.warn("Dygraph.resize() should be called with zero parameters or " +
2540 "two non-NULL parameters. Pretending it was zero.");
2541 width
= height
= null;
2544 // TODO(danvk): there should be a clear() method.
2545 this.maindiv_
.innerHTML
= "";
2546 this.attrs_
.labelsDiv
= null;
2549 this.maindiv_
.style
.width
= width
+ "px";
2550 this.maindiv_
.style
.height
= height
+ "px";
2551 this.width_
= width
;
2552 this.height_
= height
;
2554 this.width_
= this.maindiv_
.offsetWidth
;
2555 this.height_
= this.maindiv_
.offsetHeight
;
2558 this.createInterface_();
2559 this.drawGraph_(this.rawData_
);
2561 this.resize_lock
= false;
2565 * Adjusts the number of days in the rolling average. Updates the graph to
2566 * reflect the new averaging period.
2567 * @param {Number} length Number of days over which to average the data.
2569 Dygraph
.prototype.adjustRoll
= function(length
) {
2570 this.rollPeriod_
= length
;
2571 this.drawGraph_(this.rawData_
);
2575 * Returns a boolean array of visibility statuses.
2577 Dygraph
.prototype.visibility
= function() {
2578 // Do lazy-initialization, so that this happens after we know the number of
2580 if (!this.attr_("visibility")) {
2581 this.attrs_
["visibility"] = [];
2583 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
2584 this.attr_("visibility").push(true);
2586 return this.attr_("visibility");
2590 * Changes the visiblity of a series.
2592 Dygraph
.prototype.setVisibility
= function(num
, value
) {
2593 var x
= this.visibility();
2594 if (num
< 0 && num
>= x
.length
) {
2595 this.warn("invalid series number in setVisibility: " + num
);
2598 this.drawGraph_(this.rawData_
);
2603 * Update the list of annotations and redraw the chart.
2605 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
2606 this.annotations_
= ann
;
2607 this.layout_
.setAnnotations(this.annotations_
);
2608 if (!suppressDraw
) {
2609 this.drawGraph_(this.rawData_
);
2614 * Return the list of annotations.
2616 Dygraph
.prototype.annotations
= function() {
2617 return this.annotations_
;
2621 * Get the index of a series (column) given its name. The first column is the
2622 * x-axis, so the data series start with index 1.
2624 Dygraph
.prototype.indexFromSetName
= function(name
) {
2625 var labels
= this.attr_("labels");
2626 for (var i
= 0; i
< labels
.length
; i
++) {
2627 if (labels
[i
] == name
) return i
;
2632 Dygraph
.addAnnotationRule
= function() {
2633 if (Dygraph
.addedAnnotationCSS
) return;
2636 if (document
.styleSheets
.length
> 0) {
2637 mysheet
= document
.styleSheets
[0];
2639 var styleSheetElement
= document
.createElement("style");
2640 styleSheetElement
.type
= "text/css";
2641 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
2642 for(i
= 0; i
< document
.styleSheets
.length
; i
++) {
2643 if (document
.styleSheets
[i
].disabled
) continue;
2644 mysheet
= document
.styleSheets
[i
];
2648 var rule
= "border: 1px solid black; " +
2649 "background-color: white; " +
2650 "text-align: center;";
2651 if (mysheet
.insertRule
) { // Firefox
2652 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", 0);
2653 } else if (mysheet
.addRule
) { // IE
2654 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
2657 Dygraph
.addedAnnotationCSS
= true;
2661 * Create a new canvas element. This is more complex than a simple
2662 * document.createElement("canvas") because of IE and excanvas.
2664 Dygraph
.createCanvas
= function() {
2665 var canvas
= document
.createElement("canvas");
2667 isIE
= (/MSIE/.test(navigator
.userAgent
) && !window
.opera
);
2669 canvas
= G_vmlCanvasManager
.initElement(canvas
);
2677 * A wrapper around Dygraph that implements the gviz API.
2678 * @param {Object} container The DOM object the visualization should live in.
2680 Dygraph
.GVizChart
= function(container
) {
2681 this.container
= container
;
2684 Dygraph
.GVizChart
.prototype.draw
= function(data
, options
) {
2685 this.container
.innerHTML
= '';
2686 this.date_graph
= new Dygraph(this.container
, data
, options
);
2690 * Google charts compatible setSelection
2691 * Only row selection is supported, all points in the row will be highlighted
2692 * @param {Array} array of the selected cells
2695 Dygraph
.GVizChart
.prototype.setSelection
= function(selection_array
) {
2697 if (selection_array
.length
) {
2698 row
= selection_array
[0].row
;
2700 this.date_graph
.setSelection(row
);
2704 * Google charts compatible getSelection implementation
2705 * @return {Array} array of the selected cells
2708 Dygraph
.GVizChart
.prototype.getSelection
= function() {
2711 var row
= this.date_graph
.getSelection();
2713 if (row
< 0) return selection
;
2716 for (var i
in this.date_graph
.layout_
.datasets
) {
2717 selection
.push({row
: row
, column
: col
});
2724 // Older pages may still use this name.
2725 DateGraph
= Dygraph
;