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
27 Date,SeriesA,SeriesB,...
28 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
29 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
31 If the 'fractions' option is set, the input should be of the form:
33 Date,SeriesA,SeriesB,...
34 YYYYMMDD,A1/B1,A2/B2,...
35 YYYYMMDD,A1/B1,A2/B2,...
37 And error bars will be calculated automatically using a binomial distribution.
39 For further documentation and examples, see http://dygraphs.com/
44 * Creates an interactive, zoomable chart.
47 * @param {div | String} div A div or the id of a div into which to construct
49 * @param {String | Function} file A file containing CSV data or a function
50 * that returns this data. The most basic expected format for each line is
51 * "YYYY/MM/DD,val1,val2,...". For more information, see
52 * http://dygraphs.com/data.html.
53 * @param {Object} attrs Various other attributes, e.g. errorBars determines
54 * whether the input data contains error ranges. For a complete list of
55 * options, see http://dygraphs.com/options.html.
57 Dygraph
= function(div
, data
, opts
) {
58 if (arguments
.length
> 0) {
59 if (arguments
.length
== 4) {
60 // Old versions of dygraphs took in the series labels as a constructor
61 // parameter. This doesn't make sense anymore, but it's easy to continue
62 // to support this usage.
63 this.warn("Using deprecated four-argument dygraph constructor");
64 this.__old_init__(div
, data
, arguments
[2], arguments
[3]);
66 this.__init__(div
, data
, opts
);
71 Dygraph
.NAME
= "Dygraph";
72 Dygraph
.VERSION
= "1.2";
73 Dygraph
.__repr__
= function() {
74 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
78 * Returns information about the Dygraph class.
80 Dygraph
.toString
= function() {
81 return this.__repr__();
84 // Various default values
85 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
86 Dygraph
.DEFAULT_WIDTH
= 480;
87 Dygraph
.DEFAULT_HEIGHT
= 320;
89 // Default attribute values.
90 Dygraph
.DEFAULT_ATTRS
= {
91 highlightCircleSize
: 3,
97 // TODO(danvk): move defaults from createStatusMessage_ here.
99 labelsSeparateLines
: false,
100 labelsShowZeroValues
: true,
103 showLabelsOnHighlight
: true,
105 yValueFormatter
: function(a
,b
) { return Dygraph
.numberFormatter(a
,b
); },
106 digitsAfterDecimal
: 2,
113 axisLabelFontSize
: 14,
116 xAxisLabelFormatter
: Dygraph
.dateAxisFormatter
,
120 xValueFormatter
: Dygraph
.dateString_
,
121 xValueParser
: Dygraph
.dateParser
,
122 xTicker
: Dygraph
.dateTicker
,
129 wilsonInterval
: true, // only relevant if fractions is true
133 connectSeparatedPoints
: false,
136 hideOverlayOnMouseOut
: true,
138 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
139 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
144 // Sizes of the various chart labels.
151 axisLineColor
: "black",
154 axisLabelColor
: "black",
155 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
159 gridLineColor
: "rgb(128,128,128)",
161 interactionModel
: null // will be set to Dygraph.Interaction.defaultModel
164 // Directions for panning and zooming. Use bit operations when combined
165 // values are possible.
166 Dygraph
.HORIZONTAL
= 1;
167 Dygraph
.VERTICAL
= 2;
169 // Used for initializing annotation CSS rules only once.
170 Dygraph
.addedAnnotationCSS
= false;
172 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
173 // Labels is no longer a constructor parameter, since it's typically set
174 // directly from the data source. It also conains a name for the x-axis,
175 // which the previous constructor form did not.
176 if (labels
!= null) {
177 var new_labels
= ["Date"];
178 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
179 Dygraph
.update(attrs
, { 'labels': new_labels
});
181 this.__init__(div
, file
, attrs
);
185 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
186 * and context <canvas> inside of it. See the constructor for details.
188 * @param {Element} div the Element to render the graph into.
189 * @param {String | Function} file Source data
190 * @param {Object} attrs Miscellaneous other options
193 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
194 // Hack for IE: if we're using excanvas and the document hasn't finished
195 // loading yet (and hence may not have initialized whatever it needs to
196 // initialize), then keep calling this routine periodically until it has.
197 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
198 typeof(G_vmlCanvasManager
) != 'undefined' &&
199 document
.readyState
!= 'complete') {
201 setTimeout(function() { self
.__init__(div
, file
, attrs
) }, 100);
204 // Support two-argument constructor
205 if (attrs
== null) { attrs
= {}; }
207 // Copy the important bits into the object
208 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
211 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
212 this.previousVerticalX_
= -1;
213 this.fractions_
= attrs
.fractions
|| false;
214 this.dateWindow_
= attrs
.dateWindow
|| null;
216 this.wilsonInterval_
= attrs
.wilsonInterval
|| true;
217 this.is_initial_draw_
= true;
218 this.annotations_
= [];
220 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
221 this.zoomed_x_
= false;
222 this.zoomed_y_
= false;
224 // Clear the div. This ensure that, if multiple dygraphs are passed the same
225 // div, then only one will be drawn.
228 // For historical reasons, the 'width' and 'height' options trump all CSS
229 // rules _except_ for an explicit 'width' or 'height' on the div.
230 // As an added convenience, if the div has zero height (like <div></div> does
231 // without any styles), then we use a default height/width
.
232 if (div
.style
.width
== '' && attrs
.width
) {
233 div
.style
.width
= attrs
.width
+ "px";
235 if (div
.style
.height
== '' && attrs
.height
) {
236 div
.style
.height
= attrs
.height
+ "px";
238 if (div
.style
.height
== '' && div
.offsetHeight
== 0) {
239 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
240 if (div
.style
.width
== '') {
241 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
244 // these will be zero if the dygraph's div is hidden.
245 this.width_
= div
.offsetWidth
;
246 this.height_
= div
.offsetHeight
;
248 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
249 if (attrs
['stackedGraph']) {
250 attrs
['fillGraph'] = true;
251 // TODO(nikhilk): Add any other stackedGraph checks here.
254 // Dygraphs has many options, some of which interact with one another.
255 // To keep track of everything, we maintain two sets of options:
257 // this.user_attrs_ only options explicitly set by the user.
258 // this.attrs_ defaults, options derived from user_attrs_, data.
260 // Options are then accessed this.attr_('attr'), which first looks at
261 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
262 // defaults without overriding behavior that the user specifically asks for.
263 this.user_attrs_
= {};
264 Dygraph
.update(this.user_attrs_
, attrs
);
267 Dygraph
.update(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
269 this.boundaryIds_
= [];
271 // Create the containing DIV and other interactive elements
272 this.createInterface_();
278 * Returns the zoomed status of the chart for one or both axes.
280 * Axis is an optional parameter. Can be set to 'x' or 'y'.
282 * The zoomed status for an axis is set whenever a user zooms using the mouse
283 * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom
284 * option is also specified).
286 Dygraph
.prototype.isZoomed
= function(axis
) {
287 if (axis
== null) return this.zoomed_x_
|| this.zoomed_y_
;
288 if (axis
== 'x') return this.zoomed_x_
;
289 if (axis
== 'y') return this.zoomed_y_
;
290 throw "axis parameter to Dygraph.isZoomed must be missing, 'x' or 'y'.";
294 * Returns information about the Dygraph object, including its containing ID.
296 Dygraph
.prototype.toString
= function() {
297 var maindiv
= this.maindiv_
;
298 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
299 return "[Dygraph " + id
+ "]";
304 * Returns the value of an option. This may be set by the user (either in the
305 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
307 * @param { String } name The name of the option, e.g. 'rollPeriod'.
308 * @param { String } [seriesName] The name of the series to which the option
309 * will be applied. If no per-series value of this option is available, then
310 * the global value is returned. This is optional.
311 * @return { ... } The value of the option.
313 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
314 // <REMOVE_FOR_COMBINED>
315 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
316 this.error('Must include options reference JS for testing');
317 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
318 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
319 'in the Dygraphs.OPTIONS_REFERENCE listing.');
320 // Only log this error once.
321 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
323 // </REMOVE_FOR_COMBINED
>
325 typeof(this.user_attrs_
[seriesName
]) != 'undefined' &&
326 this.user_attrs_
[seriesName
] != null &&
327 typeof(this.user_attrs_
[seriesName
][name
]) != 'undefined') {
328 return this.user_attrs_
[seriesName
][name
];
329 } else if (typeof(this.user_attrs_
[name
]) != 'undefined') {
330 return this.user_attrs_
[name
];
331 } else if (typeof(this.attrs_
[name
]) != 'undefined') {
332 return this.attrs_
[name
];
339 * Returns the current rolling period, as set by the user or an option.
340 * @return {Number} The number of points in the rolling window
342 Dygraph
.prototype.rollPeriod
= function() {
343 return this.rollPeriod_
;
347 * Returns the currently-visible x-range. This can be affected by zooming,
348 * panning or a call to updateOptions.
349 * Returns a two-element array: [left, right].
350 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
352 Dygraph
.prototype.xAxisRange
= function() {
353 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
357 * Returns the lower- and upper-bound x-axis values of the
360 Dygraph
.prototype.xAxisExtremes
= function() {
361 var left
= this.rawData_
[0][0];
362 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
363 return [left
, right
];
367 * Returns the currently-visible y-range for an axis. This can be affected by
368 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
369 * called with no arguments, returns the range of the first axis.
370 * Returns a two-element array: [bottom, top].
372 Dygraph
.prototype.yAxisRange
= function(idx
) {
373 if (typeof(idx
) == "undefined") idx
= 0;
374 if (idx
< 0 || idx
>= this.axes_
.length
) {
377 var axis
= this.axes_
[idx
];
378 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
382 * Returns the currently-visible y-ranges for each axis. This can be affected by
383 * zooming, panning, calls to updateOptions, etc.
384 * Returns an array of [bottom, top] pairs, one for each y-axis.
386 Dygraph
.prototype.yAxisRanges
= function() {
388 for (var i
= 0; i
< this.axes_
.length
; i
++) {
389 ret
.push(this.yAxisRange(i
));
394 // TODO(danvk): use these functions throughout dygraphs.
396 * Convert from data coordinates to canvas/div X/Y coordinates.
397 * If specified, do this conversion for the coordinate system of a particular
398 * axis. Uses the first axis by default.
399 * Returns a two-element array: [X, Y]
401 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
402 * instead of toDomCoords(null, y, axis).
404 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
405 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
409 * Convert from data x coordinates to canvas/div X coordinate.
410 * If specified, do this conversion for the coordinate system of a particular
412 * Returns a single value or null if x is null.
414 Dygraph
.prototype.toDomXCoord
= function(x
) {
419 var area
= this.plotter_
.area
;
420 var xRange
= this.xAxisRange();
421 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
425 * Convert from data x coordinates to canvas/div Y coordinate and optional
426 * axis. Uses the first axis by default.
428 * returns a single value or null if y is null.
430 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
431 var pct
= this.toPercentYCoord(y
, axis
);
436 var area
= this.plotter_
.area
;
437 return area
.y
+ pct
* area
.h
;
441 * Convert from canvas/div coords to data coordinates.
442 * If specified, do this conversion for the coordinate system of a particular
443 * axis. Uses the first axis by default.
444 * Returns a two-element array: [X, Y].
446 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
447 * instead of toDataCoords(null, y, axis).
449 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
450 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
454 * Convert from canvas/div x coordinate to data coordinate.
456 * If x is null, this returns null.
458 Dygraph
.prototype.toDataXCoord
= function(x
) {
463 var area
= this.plotter_
.area
;
464 var xRange
= this.xAxisRange();
465 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
469 * Convert from canvas/div y coord to value.
471 * If y is null, this returns null.
472 * if axis is null, this uses the first axis.
474 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
479 var area
= this.plotter_
.area
;
480 var yRange
= this.yAxisRange(axis
);
482 if (typeof(axis
) == "undefined") axis
= 0;
483 if (!this.axes_
[axis
].logscale
) {
484 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
486 // Computing the inverse of toDomCoord.
487 var pct
= (y
- area
.y
) / area
.h
489 // Computing the inverse of toPercentYCoord. The function was arrived at with
490 // the following steps:
492 // Original calcuation:
493 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
495 // Move denominator to both sides:
496 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
498 // subtract logr1, and take the negative value.
499 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
501 // Swap both sides of the equation, and we can compute the log of the
502 // return value. Which means we just need to use that as the exponent in
504 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
506 var logr1
= Dygraph
.log10(yRange
[1]);
507 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
508 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
514 * Converts a y for an axis to a percentage from the top to the
515 * bottom of the drawing area.
517 * If the coordinate represents a value visible on the canvas, then
518 * the value will be between 0 and 1, where 0 is the top of the canvas.
519 * However, this method will return values outside the range, as
520 * values can fall outside the canvas.
522 * If y is null, this returns null.
523 * if axis is null, this uses the first axis.
525 * @param { Number } y The data y-coordinate.
526 * @param { Number } [axis] The axis number on which the data coordinate lives.
527 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
529 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
533 if (typeof(axis
) == "undefined") axis
= 0;
535 var area
= this.plotter_
.area
;
536 var yRange
= this.yAxisRange(axis
);
539 if (!this.axes_
[axis
].logscale
) {
540 // yRange[1] - y is unit distance from the bottom.
541 // yRange[1] - yRange[0] is the scale of the range.
542 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
543 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
545 var logr1
= Dygraph
.log10(yRange
[1]);
546 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
552 * Converts an x value to a percentage from the left to the right of
555 * If the coordinate represents a value visible on the canvas, then
556 * the value will be between 0 and 1, where 0 is the left of the canvas.
557 * However, this method will return values outside the range, as
558 * values can fall outside the canvas.
560 * If x is null, this returns null.
561 * @param { Number } x The data x-coordinate.
562 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
564 Dygraph
.prototype.toPercentXCoord
= function(x
) {
569 var xRange
= this.xAxisRange();
570 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
574 * Returns the number of columns (including the independent variable).
575 * @return { Integer } The number of columns.
577 Dygraph
.prototype.numColumns
= function() {
578 return this.rawData_
[0].length
;
582 * Returns the number of rows (excluding any header/label row).
583 * @return { Integer } The number of rows, less any header.
585 Dygraph
.prototype.numRows
= function() {
586 return this.rawData_
.length
;
590 * Returns the value in the given row and column. If the row and column exceed
591 * the bounds on the data, returns null. Also returns null if the value is
593 * @param { Number} row The row number of the data (0-based). Row 0 is the
594 * first row of data, not a header row.
595 * @param { Number} col The column number of the data (0-based)
596 * @return { Number } The value in the specified cell or null if the row/col
599 Dygraph
.prototype.getValue
= function(row
, col
) {
600 if (row
< 0 || row
> this.rawData_
.length
) return null;
601 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
603 return this.rawData_
[row
][col
];
607 * Generates interface elements for the Dygraph: a containing div, a div to
608 * display the current point, and a textbox to adjust the rolling average
609 * period. Also creates the Renderer/Layout elements.
612 Dygraph
.prototype.createInterface_
= function() {
613 // Create the all-enclosing graph div
614 var enclosing
= this.maindiv_
;
616 this.graphDiv
= document
.createElement("div");
617 this.graphDiv
.style
.width
= this.width_
+ "px";
618 this.graphDiv
.style
.height
= this.height_
+ "px";
619 enclosing
.appendChild(this.graphDiv
);
621 // Create the canvas for interactive parts of the chart.
622 this.canvas_
= Dygraph
.createCanvas();
623 this.canvas_
.style
.position
= "absolute";
624 this.canvas_
.width
= this.width_
;
625 this.canvas_
.height
= this.height_
;
626 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
627 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
629 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
631 // ... and for static parts of the chart.
632 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
633 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
635 // The interactive parts of the graph are drawn on top of the chart.
636 this.graphDiv
.appendChild(this.hidden_
);
637 this.graphDiv
.appendChild(this.canvas_
);
638 this.mouseEventElement_
= this.canvas_
;
641 Dygraph
.addEvent(this.mouseEventElement_
, 'mousemove', function(e
) {
642 dygraph
.mouseMove_(e
);
644 Dygraph
.addEvent(this.mouseEventElement_
, 'mouseout', function(e
) {
645 dygraph
.mouseOut_(e
);
648 // Create the grapher
649 this.layout_
= new DygraphLayout(this);
651 this.createStatusMessage_();
652 this.createDragInterface_();
656 * Detach DOM elements in the dygraph and null out all data references.
657 * Calling this when you're done with a dygraph can dramatically reduce memory
658 * usage. See, e.g., the tests/perf.html example.
660 Dygraph
.prototype.destroy
= function() {
661 var removeRecursive
= function(node
) {
662 while (node
.hasChildNodes()) {
663 removeRecursive(node
.firstChild
);
664 node
.removeChild(node
.firstChild
);
667 removeRecursive(this.maindiv_
);
669 var nullOut
= function(obj
) {
671 if (typeof(obj
[n
]) === 'object') {
677 // These may not all be necessary, but it can't hurt...
678 nullOut(this.layout_
);
679 nullOut(this.plotter_
);
684 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
685 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
686 * or the zoom rectangles) is done on this.canvas_.
687 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
688 * @return {Object} The newly-created canvas
691 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
692 var h
= Dygraph
.createCanvas();
693 h
.style
.position
= "absolute";
694 // TODO(danvk): h should be offset from canvas. canvas needs to include
695 // some extra area to make it easier to zoom in on the far left and far
696 // right. h needs to be precisely the plot area, so that clipping occurs.
697 h
.style
.top
= canvas
.style
.top
;
698 h
.style
.left
= canvas
.style
.left
;
699 h
.width
= this.width_
;
700 h
.height
= this.height_
;
701 h
.style
.width
= this.width_
+ "px"; // for IE
702 h
.style
.height
= this.height_
+ "px"; // for IE
707 * Generate a set of distinct colors for the data series. This is done with a
708 * color wheel. Saturation/Value are customizable, and the hue is
709 * equally-spaced around the color wheel. If a custom set of colors is
710 * specified, that is used instead.
713 Dygraph
.prototype.setColors_
= function() {
714 var num
= this.attr_("labels").length
- 1;
716 var colors
= this.attr_('colors');
718 var sat
= this.attr_('colorSaturation') || 1.0;
719 var val
= this.attr_('colorValue') || 0.5;
720 var half
= Math
.ceil(num
/ 2);
721 for (var i
= 1; i
<= num
; i
++) {
722 if (!this.visibility()[i
-1]) continue;
723 // alternate colors for high contrast.
724 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
725 var hue
= (1.0 * idx
/ (1 + num
));
726 this.colors_
.push(Dygraph
.hsvToRGB(hue
, sat
, val
));
729 for (var i
= 0; i
< num
; i
++) {
730 if (!this.visibility()[i
]) continue;
731 var colorStr
= colors
[i
% colors
.length
];
732 this.colors_
.push(colorStr
);
736 this.plotter_
.setColors(this.colors_
);
740 * Return the list of colors. This is either the list of colors passed in the
741 * attributes or the autogenerated list of rgb(r,g,b) strings.
742 * @return {Array<string>} The list of colors.
744 Dygraph
.prototype.getColors
= function() {
749 * Create the div that contains information on the selected point(s)
750 * This goes in the top right of the canvas, unless an external div has already
754 Dygraph
.prototype.createStatusMessage_
= function() {
755 var userLabelsDiv
= this.user_attrs_
["labelsDiv"];
756 if (userLabelsDiv
&& null != userLabelsDiv
757 && (typeof(userLabelsDiv
) == "string" || userLabelsDiv
instanceof String
)) {
758 this.user_attrs_
["labelsDiv"] = document
.getElementById(userLabelsDiv
);
760 if (!this.attr_("labelsDiv")) {
761 var divWidth
= this.attr_('labelsDivWidth');
763 "position": "absolute",
766 "width": divWidth
+ "px",
768 "left": (this.width_
- divWidth
- 2) + "px",
769 "background": "white",
771 "overflow": "hidden"};
772 Dygraph
.update(messagestyle
, this.attr_('labelsDivStyles'));
773 var div
= document
.createElement("div");
774 for (var name
in messagestyle
) {
775 if (messagestyle
.hasOwnProperty(name
)) {
776 div
.style
[name
] = messagestyle
[name
];
779 this.graphDiv
.appendChild(div
);
780 this.attrs_
.labelsDiv
= div
;
785 * Position the labels div so that:
786 * - its right edge is flush with the right edge of the charting area
787 * - its top edge is flush with the top edge of the charting area
790 Dygraph
.prototype.positionLabelsDiv_
= function() {
791 // Don't touch a user-specified labelsDiv.
792 if (this.user_attrs_
.hasOwnProperty("labelsDiv")) return;
794 var area
= this.plotter_
.area
;
795 var div
= this.attr_("labelsDiv");
796 div
.style
.left
= area
.x
+ area
.w
- this.attr_("labelsDivWidth") - 1 + "px";
797 div
.style
.top
= area
.y
+ "px";
801 * Create the text box to adjust the averaging period
804 Dygraph
.prototype.createRollInterface_
= function() {
805 // Create a roller if one doesn't exist already.
807 this.roller_
= document
.createElement("input");
808 this.roller_
.type
= "text";
809 this.roller_
.style
.display
= "none";
810 this.graphDiv
.appendChild(this.roller_
);
813 var display
= this.attr_('showRoller') ? 'block' : 'none';
815 var area
= this.plotter_
.area
;
816 var textAttr
= { "position": "absolute",
818 "top": (area
.y
+ area
.h
- 25) + "px",
819 "left": (area
.x
+ 1) + "px",
822 this.roller_
.size
= "2";
823 this.roller_
.value
= this.rollPeriod_
;
824 for (var name
in textAttr
) {
825 if (textAttr
.hasOwnProperty(name
)) {
826 this.roller_
.style
[name
] = textAttr
[name
];
831 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
836 * Converts page the x-coordinate of the event to pixel x-coordinates on the
837 * canvas (i.e. DOM Coords).
839 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
840 return Dygraph
.pageX(e
) - context
.px
845 * Converts page the y-coordinate of the event to pixel y-coordinates on the
846 * canvas (i.e. DOM Coords).
848 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
849 return Dygraph
.pageY(e
) - context
.py
853 * Set up all the mouse handlers needed to capture dragging behavior for zoom
857 Dygraph
.prototype.createDragInterface_
= function() {
859 // Tracks whether the mouse is down right now
861 isPanning
: false, // is this drag part of a pan?
862 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
863 dragStartX
: null, // pixel coordinates
864 dragStartY
: null, // pixel coordinates
865 dragEndX
: null, // pixel coordinates
866 dragEndY
: null, // pixel coordinates
868 prevEndX
: null, // pixel coordinates
869 prevEndY
: null, // pixel coordinates
870 prevDragDirection
: null,
872 // The value on the left side of the graph when a pan operation starts.
873 initialLeftmostDate
: null,
875 // The number of units each pixel spans. (This won't be valid for log
877 xUnitsPerPixel
: null,
879 // TODO(danvk): update this comment
880 // The range in second/value units that the viewport encompasses during a
881 // panning operation.
884 // Top-left corner of the canvas, in DOM coords
885 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
889 // Values for use with panEdgeFraction, which limit how far outside the
890 // graph's data boundaries it can be panned.
891 boundedDates
: null, // [minDate, maxDate]
892 boundedValues
: null, // [[minValue, maxValue] ...]
894 initializeMouseDown
: function(event
, g
, context
) {
895 // prevents mouse drags from selecting page text.
896 if (event
.preventDefault
) {
897 event
.preventDefault(); // Firefox, Chrome, etc.
899 event
.returnValue
= false; // IE
900 event
.cancelBubble
= true;
903 context
.px
= Dygraph
.findPosX(g
.canvas_
);
904 context
.py
= Dygraph
.findPosY(g
.canvas_
);
905 context
.dragStartX
= g
.dragGetX_(event
, context
);
906 context
.dragStartY
= g
.dragGetY_(event
, context
);
910 var interactionModel
= this.attr_("interactionModel");
912 // Self is the graph.
915 // Function that binds the graph and context to the handler.
916 var bindHandler
= function(handler
) {
917 return function(event
) {
918 handler(event
, self
, context
);
922 for (var eventName
in interactionModel
) {
923 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
924 Dygraph
.addEvent(this.mouseEventElement_
, eventName
,
925 bindHandler(interactionModel
[eventName
]));
928 // If the user releases the mouse button during a drag, but not over the
929 // canvas, then it doesn't count as a zooming action.
930 Dygraph
.addEvent(document
, 'mouseup', function(event
) {
931 if (context
.isZooming
|| context
.isPanning
) {
932 context
.isZooming
= false;
933 context
.dragStartX
= null;
934 context
.dragStartY
= null;
937 if (context
.isPanning
) {
938 context
.isPanning
= false;
939 context
.draggingDate
= null;
940 context
.dateRange
= null;
941 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
942 delete self
.axes_
[i
].draggingValue
;
943 delete self
.axes_
[i
].dragValueRange
;
951 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
952 * up any previous zoom rectangles that were drawn. This could be optimized to
953 * avoid extra redrawing, but it's tricky to avoid interactions with the status
956 * @param {Number} direction the direction of the zoom rectangle. Acceptable
957 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
958 * @param {Number} startX The X position where the drag started, in canvas
960 * @param {Number} endX The current X position of the drag, in canvas coords.
961 * @param {Number} startY The Y position where the drag started, in canvas
963 * @param {Number} endY The current Y position of the drag, in canvas coords.
964 * @param {Number} prevDirection the value of direction on the previous call to
965 * this function. Used to avoid excess redrawing
966 * @param {Number} prevEndX The value of endX on the previous call to this
967 * function. Used to avoid excess redrawing
968 * @param {Number} prevEndY The value of endY on the previous call to this
969 * function. Used to avoid excess redrawing
972 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
973 endY
, prevDirection
, prevEndX
,
975 var ctx
= this.canvas_ctx_
;
977 // Clean up from the previous rect if necessary
978 if (prevDirection
== Dygraph
.HORIZONTAL
) {
979 ctx
.clearRect(Math
.min(startX
, prevEndX
), 0,
980 Math
.abs(startX
- prevEndX
), this.height_
);
981 } else if (prevDirection
== Dygraph
.VERTICAL
){
982 ctx
.clearRect(0, Math
.min(startY
, prevEndY
),
983 this.width_
, Math
.abs(startY
- prevEndY
));
986 // Draw a light-grey rectangle to show the new viewing area
987 if (direction
== Dygraph
.HORIZONTAL
) {
988 if (endX
&& startX
) {
989 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
990 ctx
.fillRect(Math
.min(startX
, endX
), 0,
991 Math
.abs(endX
- startX
), this.height_
);
994 if (direction
== Dygraph
.VERTICAL
) {
995 if (endY
&& startY
) {
996 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
997 ctx
.fillRect(0, Math
.min(startY
, endY
),
998 this.width_
, Math
.abs(endY
- startY
));
1004 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1005 * the canvas. The exact zoom window may be slightly larger if there are no data
1006 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1007 * which accepts dates that match the raw data. This function redraws the graph.
1009 * @param {Number} lowX The leftmost pixel value that should be visible.
1010 * @param {Number} highX The rightmost pixel value that should be visible.
1013 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1014 // Find the earliest and latest dates contained in this canvasx range.
1015 // Convert the call to date ranges of the raw data.
1016 var minDate
= this.toDataXCoord(lowX
);
1017 var maxDate
= this.toDataXCoord(highX
);
1018 this.doZoomXDates_(minDate
, maxDate
);
1022 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1023 * method with doZoomX which accepts pixel coordinates. This function redraws
1026 * @param {Number} minDate The minimum date that should be visible.
1027 * @param {Number} maxDate The maximum date that should be visible.
1030 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1031 this.dateWindow_
= [minDate
, maxDate
];
1032 this.zoomed_x_
= true;
1034 if (this.attr_("zoomCallback")) {
1035 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1040 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1041 * the canvas. This function redraws the graph.
1043 * @param {Number} lowY The topmost pixel value that should be visible.
1044 * @param {Number} highY The lowest pixel value that should be visible.
1047 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1048 // Find the highest and lowest values in pixel range for each axis.
1049 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1050 // This is because pixels increase as you go down on the screen, whereas data
1051 // coordinates increase as you go up the screen.
1052 var valueRanges
= [];
1053 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1054 var hi
= this.toDataYCoord(lowY
, i
);
1055 var low
= this.toDataYCoord(highY
, i
);
1056 this.axes_
[i
].valueWindow
= [low
, hi
];
1057 valueRanges
.push([low
, hi
]);
1060 this.zoomed_y_
= true;
1062 if (this.attr_("zoomCallback")) {
1063 var xRange
= this.xAxisRange();
1064 var yRange
= this.yAxisRange();
1065 this.attr_("zoomCallback")(xRange
[0], xRange
[1], this.yAxisRanges());
1070 * Reset the zoom to the original view coordinates. This is the same as
1071 * double-clicking on the graph.
1075 Dygraph
.prototype.doUnzoom_
= function() {
1077 if (this.dateWindow_
!= null) {
1079 this.dateWindow_
= null;
1082 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1083 if (this.axes_
[i
].valueWindow
!= null) {
1085 delete this.axes_
[i
].valueWindow
;
1089 // Clear any selection, since it's likely to be drawn in the wrong place.
1090 this.clearSelection();
1093 // Putting the drawing operation before the callback because it resets
1095 this.zoomed_x_
= false;
1096 this.zoomed_y_
= false;
1098 if (this.attr_("zoomCallback")) {
1099 var minDate
= this.rawData_
[0][0];
1100 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1101 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1107 * When the mouse moves in the canvas, display information about a nearby data
1108 * point and draw dots over those points in the data series. This function
1109 * takes care of cleanup of previously-drawn dots.
1110 * @param {Object} event The mousemove event from the browser.
1113 Dygraph
.prototype.mouseMove_
= function(event
) {
1114 // This prevents JS errors when mousing over the canvas before data loads.
1115 var points
= this.layout_
.points
;
1116 if (points
=== undefined
) return;
1118 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1123 // Loop through all the points and find the date nearest to our current
1125 var minDist
= 1e+100;
1127 for (var i
= 0; i
< points
.length
; i
++) {
1128 var point
= points
[i
];
1129 if (point
== null) continue;
1130 var dist
= Math
.abs(point
.canvasx
- canvasx
);
1131 if (dist
> minDist
) continue;
1135 if (idx
>= 0) lastx
= points
[idx
].xval
;
1137 // Extract the points we've selected
1138 this.selPoints_
= [];
1139 var l
= points
.length
;
1140 if (!this.attr_("stackedGraph")) {
1141 for (var i
= 0; i
< l
; i
++) {
1142 if (points
[i
].xval
== lastx
) {
1143 this.selPoints_
.push(points
[i
]);
1147 // Need to 'unstack' points starting from the bottom
1148 var cumulative_sum
= 0;
1149 for (var i
= l
- 1; i
>= 0; i
--) {
1150 if (points
[i
].xval
== lastx
) {
1151 var p
= {}; // Clone the point since we modify it
1152 for (var k
in points
[i
]) {
1153 p
[k
] = points
[i
][k
];
1155 p
.yval
-= cumulative_sum
;
1156 cumulative_sum
+= p
.yval
;
1157 this.selPoints_
.push(p
);
1160 this.selPoints_
.reverse();
1163 if (this.attr_("highlightCallback")) {
1164 var px
= this.lastx_
;
1165 if (px
!== null && lastx
!= px
) {
1166 // only fire if the selected point has changed.
1167 this.attr_("highlightCallback")(event
, lastx
, this.selPoints_
, this.idxToRow_(idx
));
1171 // Save last x position for callbacks.
1172 this.lastx_
= lastx
;
1174 this.updateSelection_();
1178 * Transforms layout_.points index into data row number.
1179 * @param int layout_.points index
1180 * @return int row number, or -1 if none could be found.
1183 Dygraph
.prototype.idxToRow_
= function(idx
) {
1184 if (idx
< 0) return -1;
1186 for (var i
in this.layout_
.datasets
) {
1187 if (idx
< this.layout_
.datasets
[i
].length
) {
1188 return this.boundaryIds_
[0][0]+idx
;
1190 idx
-= this.layout_
.datasets
[i
].length
;
1197 * Generates HTML for the legend which is displayed when hovering over the
1198 * chart. If no selected points are specified, a default legend is returned
1199 * (this may just be the empty string).
1200 * @param { Number } [x] The x-value of the selected points.
1201 * @param { [Object] } [sel_points] List of selected points for the given
1202 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1204 Dygraph
.prototype.generateLegendHTML_
= function(x
, sel_points
) {
1205 // If no points are selected, we display a default legend. Traditionally,
1206 // this has been blank. But a better default would be a conventional legend,
1207 // which provides essential information for a non-interactive chart.
1208 if (typeof(x
) === 'undefined') {
1209 if (this.attr_('legend') != 'always') return '';
1211 var sepLines
= this.attr_('labelsSeparateLines');
1212 var labels
= this.attr_('labels');
1214 for (var i
= 1; i
< labels
.length
; i
++) {
1215 if (!this.visibility()[i
- 1]) continue;
1216 var c
= this.plotter_
.colors
[labels
[i
]];
1217 if (html
!= '') html
+= (sepLines
? '<br/>' : ' ');
1218 html
+= "<b><span style='color: " + c
+ ";'>—" + labels
[i
] +
1224 var html
= this.attr_('xValueFormatter')(x
) + ":";
1226 var fmtFunc
= this.attr_('yValueFormatter');
1227 var showZeros
= this.attr_("labelsShowZeroValues");
1228 var sepLines
= this.attr_("labelsSeparateLines");
1229 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1230 var pt
= this.selPoints_
[i
];
1231 if (pt
.yval
== 0 && !showZeros
) continue;
1232 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1233 if (sepLines
) html
+= "<br/>";
1235 var c
= this.plotter_
.colors
[pt
.name
];
1236 var yval
= fmtFunc(pt
.yval
, this);
1237 // TODO(danvk): use a template string here and make it an attribute.
1238 html
+= " <b><span style='color: " + c
+ ";'>"
1239 + pt
.name
+ "</span></b>:"
1247 * Displays information about the selected points in the legend. If there is no
1248 * selection, the legend will be cleared.
1249 * @param { Number } [x] The x-value of the selected points.
1250 * @param { [Object] } [sel_points] List of selected points for the given
1251 * x-value. Should have properties like 'name', 'yval' and 'canvasy'.
1253 Dygraph
.prototype.setLegendHTML_
= function(x
, sel_points
) {
1254 var html
= this.generateLegendHTML_(x
, sel_points
);
1255 var labelsDiv
= this.attr_("labelsDiv");
1256 if (labelsDiv
!== null) {
1257 labelsDiv
.innerHTML
= html
;
1259 if (typeof(this.shown_legend_error_
) == 'undefined') {
1260 this.error('labelsDiv is set to something nonexistent; legend will not be shown.');
1261 this.shown_legend_error_
= true;
1267 * Draw dots over the selectied points in the data series. This function
1268 * takes care of cleanup of previously-drawn dots.
1271 Dygraph
.prototype.updateSelection_
= function() {
1272 // Clear the previously drawn vertical, if there is one
1273 var ctx
= this.canvas_ctx_
;
1274 if (this.previousVerticalX_
>= 0) {
1275 // Determine the maximum highlight circle size.
1276 var maxCircleSize
= 0;
1277 var labels
= this.attr_('labels');
1278 for (var i
= 1; i
< labels
.length
; i
++) {
1279 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1280 if (r
> maxCircleSize
) maxCircleSize
= r
;
1282 var px
= this.previousVerticalX_
;
1283 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1284 2 * maxCircleSize
+ 2, this.height_
);
1287 if (this.selPoints_
.length
> 0) {
1288 // Set the status message to indicate the selected point(s)
1289 if (this.attr_('showLabelsOnHighlight')) {
1290 this.setLegendHTML_(this.lastx_
, this.selPoints_
);
1293 // Draw colored circles over the center of each selected point
1294 var canvasx
= this.selPoints_
[0].canvasx
;
1296 for (var i
= 0; i
< this.selPoints_
.length
; i
++) {
1297 var pt
= this.selPoints_
[i
];
1298 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1300 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1302 ctx
.fillStyle
= this.plotter_
.colors
[pt
.name
];
1303 ctx
.arc(canvasx
, pt
.canvasy
, circleSize
, 0, 2 * Math
.PI
, false);
1308 this.previousVerticalX_
= canvasx
;
1313 * Manually set the selected points and display information about them in the
1314 * legend. The selection can be cleared using clearSelection() and queried
1315 * using getSelection().
1316 * @param { Integer } row number that should be highlighted (i.e. appear with
1317 * hover dots on the chart). Set to false to clear any selection.
1319 Dygraph
.prototype.setSelection
= function(row
) {
1320 // Extract the points we've selected
1321 this.selPoints_
= [];
1324 if (row
!== false) {
1325 row
= row
-this.boundaryIds_
[0][0];
1328 if (row
!== false && row
>= 0) {
1329 for (var i
in this.layout_
.datasets
) {
1330 if (row
< this.layout_
.datasets
[i
].length
) {
1331 var point
= this.layout_
.points
[pos
+row
];
1333 if (this.attr_("stackedGraph")) {
1334 point
= this.layout_
.unstackPointAtIndex(pos
+row
);
1337 this.selPoints_
.push(point
);
1339 pos
+= this.layout_
.datasets
[i
].length
;
1343 if (this.selPoints_
.length
) {
1344 this.lastx_
= this.selPoints_
[0].xval
;
1345 this.updateSelection_();
1347 this.clearSelection();
1353 * The mouse has left the canvas. Clear out whatever artifacts remain
1354 * @param {Object} event the mouseout event from the browser.
1357 Dygraph
.prototype.mouseOut_
= function(event
) {
1358 if (this.attr_("unhighlightCallback")) {
1359 this.attr_("unhighlightCallback")(event
);
1362 if (this.attr_("hideOverlayOnMouseOut")) {
1363 this.clearSelection();
1368 * Clears the current selection (i.e. points that were highlighted by moving
1369 * the mouse over the chart).
1371 Dygraph
.prototype.clearSelection
= function() {
1372 // Get rid of the overlay data
1373 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
1374 this.setLegendHTML_();
1375 this.selPoints_
= [];
1380 * Returns the number of the currently selected row. To get data for this row,
1381 * you can use the getValue method.
1382 * @return { Integer } row number, or -1 if nothing is selected
1384 Dygraph
.prototype.getSelection
= function() {
1385 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
1389 for (var row
=0; row
<this.layout_
.points
.length
; row
++ ) {
1390 if (this.layout_
.points
[row
].x
== this.selPoints_
[0].x
) {
1391 return row
+ this.boundaryIds_
[0][0];
1399 * Return a string version of a number. This respects the digitsAfterDecimal
1400 * and maxNumberWidth options.
1401 * @param {Number} x The number to be formatted
1402 * @param {Dygraph} g The dygraph object
1404 Dygraph
.numberFormatter
= function(x
, g
) {
1405 var sigFigs
= g
.attr_('sigFigs');
1407 if (sigFigs
!== null) {
1408 // User has opted for a fixed number of significant figures.
1409 return Dygraph
.floatFormat(x
, sigFigs
);
1412 var digits
= g
.attr_('digitsAfterDecimal');
1413 var maxNumberWidth
= g
.attr_('maxNumberWidth');
1415 // switch to scientific notation if we underflow or overflow fixed display.
1417 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
1418 Math
.abs(x
) < Math
.pow(10, -digits
))) {
1419 return x
.toExponential(digits
);
1421 return '' + Dygraph
.round_(x
, digits
);
1426 * Convert a JS date to a string appropriate to display on an axis that
1427 * is displaying values at the stated granularity.
1428 * @param {Date} date The date to format
1429 * @param {Number} granularity One of the Dygraph granularity constants
1430 * @return {String} The formatted date
1433 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
1434 if (granularity
>= Dygraph
.DECADAL
) {
1435 return date
.strftime('%Y');
1436 } else if (granularity
>= Dygraph
.MONTHLY
) {
1437 return date
.strftime('%b %y');
1439 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
1440 if (frac
== 0 || granularity
>= Dygraph
.DAILY
) {
1441 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
1443 return Dygraph
.hmsString_(date
.getTime());
1449 * Fires when there's data available to be graphed.
1450 * @param {String} data Raw CSV data to be plotted
1453 Dygraph
.prototype.loadedEvent_
= function(data
) {
1454 this.rawData_
= this.parseCSV_(data
);
1458 Dygraph
.prototype.months
= ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
1459 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
1460 Dygraph
.prototype.quarters
= ["Jan", "Apr", "Jul", "Oct"];
1463 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
1466 Dygraph
.prototype.addXTicks_
= function() {
1467 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
1469 if (this.dateWindow_
) {
1470 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
1472 range
= [this.rawData_
[0][0], this.rawData_
[this.rawData_
.length
- 1][0]];
1475 var xTicks
= this.attr_('xTicker')(range
[0], range
[1], this);
1476 this.layout_
.setXTicks(xTicks
);
1479 // Time granularity enumeration
1480 Dygraph
.SECONDLY
= 0;
1481 Dygraph
.TWO_SECONDLY
= 1;
1482 Dygraph
.FIVE_SECONDLY
= 2;
1483 Dygraph
.TEN_SECONDLY
= 3;
1484 Dygraph
.THIRTY_SECONDLY
= 4;
1485 Dygraph
.MINUTELY
= 5;
1486 Dygraph
.TWO_MINUTELY
= 6;
1487 Dygraph
.FIVE_MINUTELY
= 7;
1488 Dygraph
.TEN_MINUTELY
= 8;
1489 Dygraph
.THIRTY_MINUTELY
= 9;
1490 Dygraph
.HOURLY
= 10;
1491 Dygraph
.TWO_HOURLY
= 11;
1492 Dygraph
.SIX_HOURLY
= 12;
1494 Dygraph
.WEEKLY
= 14;
1495 Dygraph
.MONTHLY
= 15;
1496 Dygraph
.QUARTERLY
= 16;
1497 Dygraph
.BIANNUAL
= 17;
1498 Dygraph
.ANNUAL
= 18;
1499 Dygraph
.DECADAL
= 19;
1500 Dygraph
.CENTENNIAL
= 20;
1501 Dygraph
.NUM_GRANULARITIES
= 21;
1503 Dygraph
.SHORT_SPACINGS
= [];
1504 Dygraph
.SHORT_SPACINGS
[Dygraph
.SECONDLY
] = 1000 * 1;
1505 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_SECONDLY
] = 1000 * 2;
1506 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_SECONDLY
] = 1000 * 5;
1507 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_SECONDLY
] = 1000 * 10;
1508 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_SECONDLY
] = 1000 * 30;
1509 Dygraph
.SHORT_SPACINGS
[Dygraph
.MINUTELY
] = 1000 * 60;
1510 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_MINUTELY
] = 1000 * 60 * 2;
1511 Dygraph
.SHORT_SPACINGS
[Dygraph
.FIVE_MINUTELY
] = 1000 * 60 * 5;
1512 Dygraph
.SHORT_SPACINGS
[Dygraph
.TEN_MINUTELY
] = 1000 * 60 * 10;
1513 Dygraph
.SHORT_SPACINGS
[Dygraph
.THIRTY_MINUTELY
] = 1000 * 60 * 30;
1514 Dygraph
.SHORT_SPACINGS
[Dygraph
.HOURLY
] = 1000 * 3600;
1515 Dygraph
.SHORT_SPACINGS
[Dygraph
.TWO_HOURLY
] = 1000 * 3600 * 2;
1516 Dygraph
.SHORT_SPACINGS
[Dygraph
.SIX_HOURLY
] = 1000 * 3600 * 6;
1517 Dygraph
.SHORT_SPACINGS
[Dygraph
.DAILY
] = 1000 * 86400;
1518 Dygraph
.SHORT_SPACINGS
[Dygraph
.WEEKLY
] = 1000 * 604800;
1522 * If we used this time granularity, how many ticks would there be?
1523 * This is only an approximation, but it's generally good enough.
1525 Dygraph
.prototype.NumXTicks
= function(start_time
, end_time
, granularity
) {
1526 if (granularity
< Dygraph
.MONTHLY
) {
1527 // Generate one tick mark for every fixed interval of time.
1528 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1529 return Math
.floor(0.5 + 1.0 * (end_time
- start_time
) / spacing
);
1531 var year_mod
= 1; // e.g. to only print one point every 10 years.
1532 var num_months
= 12;
1533 if (granularity
== Dygraph
.QUARTERLY
) num_months
= 3;
1534 if (granularity
== Dygraph
.BIANNUAL
) num_months
= 2;
1535 if (granularity
== Dygraph
.ANNUAL
) num_months
= 1;
1536 if (granularity
== Dygraph
.DECADAL
) { num_months
= 1; year_mod
= 10; }
1537 if (granularity
== Dygraph
.CENTENNIAL
) { num_months
= 1; year_mod
= 100; }
1539 var msInYear
= 365.2524 * 24 * 3600 * 1000;
1540 var num_years
= 1.0 * (end_time
- start_time
) / msInYear
;
1541 return Math
.floor(0.5 + 1.0 * num_years
* num_months
/ year_mod
);
1548 * Construct an x-axis of nicely-formatted times on meaningful boundaries
1549 * (e.g. 'Jan 09' rather than 'Jan 22, 2009').
1551 * Returns an array containing {v: millis, label: label} dictionaries.
1553 Dygraph
.prototype.GetXAxis
= function(start_time
, end_time
, granularity
) {
1554 var formatter
= this.attr_("xAxisLabelFormatter");
1556 if (granularity
< Dygraph
.MONTHLY
) {
1557 // Generate one tick mark for every fixed interval of time.
1558 var spacing
= Dygraph
.SHORT_SPACINGS
[granularity
];
1559 var format
= '%d%b'; // e.g. "1Jan"
1561 // Find a time less than start_time which occurs on a "nice" time boundary
1562 // for this granularity.
1563 var g
= spacing
/ 1000;
1564 var d
= new Date(start_time
);
1565 if (g
<= 60) { // seconds
1566 var x
= d
.getSeconds(); d
.setSeconds(x
- x
% g
);
1570 if (g
<= 60) { // minutes
1571 var x
= d
.getMinutes(); d
.setMinutes(x
- x
% g
);
1576 if (g
<= 24) { // days
1577 var x
= d
.getHours(); d
.setHours(x
- x
% g
);
1582 if (g
== 7) { // one week
1583 d
.setDate(d
.getDate() - d
.getDay());
1588 start_time
= d
.getTime();
1590 for (var t
= start_time
; t
<= end_time
; t
+= spacing
) {
1591 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1594 // Display a tick mark on the first of a set of months of each year.
1595 // Years get a tick mark iff y % year_mod == 0. This is useful for
1596 // displaying a tick mark once every 10 years, say, on long time scales.
1598 var year_mod
= 1; // e.g. to only print one point every 10 years.
1600 if (granularity
== Dygraph
.MONTHLY
) {
1601 months
= [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
1602 } else if (granularity
== Dygraph
.QUARTERLY
) {
1603 months
= [ 0, 3, 6, 9 ];
1604 } else if (granularity
== Dygraph
.BIANNUAL
) {
1606 } else if (granularity
== Dygraph
.ANNUAL
) {
1608 } else if (granularity
== Dygraph
.DECADAL
) {
1611 } else if (granularity
== Dygraph
.CENTENNIAL
) {
1615 this.warn("Span of dates is too long");
1618 var start_year
= new Date(start_time
).getFullYear();
1619 var end_year
= new Date(end_time
).getFullYear();
1620 var zeropad
= Dygraph
.zeropad
;
1621 for (var i
= start_year
; i
<= end_year
; i
++) {
1622 if (i
% year_mod
!= 0) continue;
1623 for (var j
= 0; j
< months
.length
; j
++) {
1624 var date_str
= i
+ "/" + zeropad(1 + months[j]) + "/01";
1625 var t
= Dygraph
.dateStrToMillis(date_str
);
1626 if (t
< start_time
|| t
> end_time
) continue;
1627 ticks
.push({ v
:t
, label
: formatter(new Date(t
), granularity
) });
1637 * Add ticks to the x-axis based on a date range.
1638 * @param {Number} startDate Start of the date window (millis since epoch)
1639 * @param {Number} endDate End of the date window (millis since epoch)
1640 * @param {Dygraph} self The dygraph object
1641 * @return { [Object] } Array of {label, value} tuples.
1644 Dygraph
.dateTicker
= function(startDate
, endDate
, self
) {
1645 // TODO(danvk): why does this take 'self' as a param?
1647 for (var i
= 0; i
< Dygraph
.NUM_GRANULARITIES
; i
++) {
1648 var num_ticks
= self
.NumXTicks(startDate
, endDate
, i
);
1649 if (self
.width_
/ num_ticks
>= self
.attr_('pixelsPerXLabel')) {
1656 return self
.GetXAxis(startDate
, endDate
, chosen
);
1658 // this can happen if self.width_ is zero.
1665 * This is a list of human-friendly values at which to show tick marks on a log
1666 * scale. It is k * 10^n, where k=1..9 and n=-39..+39, so:
1667 * ..., 1, 2, 3, 4, 5, ..., 9, 10, 20, 30, ..., 90, 100, 200, 300, ...
1668 * NOTE: this assumes that Dygraph.LOG_SCALE = 10.
1670 Dygraph
.PREFERRED_LOG_TICK_VALUES
= function() {
1672 for (var power
= -39; power
<= 39; power
++) {
1673 var range
= Math
.pow(10, power
);
1674 for (var mult
= 1; mult
<= 9; mult
++) {
1675 var val
= range
* mult
;
1682 // TODO(konigsberg): Update comment.
1684 * Add ticks when the x axis has numbers on it (instead of dates)
1686 * @param {Number} minV minimum value
1687 * @param {Number} maxV maximum value
1689 * @param {function} attribute accessor function.
1690 * @return {[Object]} Array of {label, value} tuples.
1692 Dygraph
.numericTicks
= function(minV
, maxV
, self
, axis_props
, vals
) {
1693 var attr
= function(k
) {
1694 if (axis_props
&& axis_props
.hasOwnProperty(k
)) return axis_props
[k
];
1695 return self
.attr_(k
);
1700 for (var i
= 0; i
< vals
.length
; i
++) {
1701 ticks
.push({v
: vals
[i
]});
1704 if (axis_props
&& attr("logscale")) {
1705 var pixelsPerTick
= attr('pixelsPerYLabel');
1706 // NOTE(konigsberg): Dan, should self.height_ be self.plotter_.area.h?
1707 var nTicks
= Math
.floor(self
.height_
/ pixelsPerTick
);
1708 var minIdx
= Dygraph
.binarySearch(minV
, Dygraph
.PREFERRED_LOG_TICK_VALUES
, 1);
1709 var maxIdx
= Dygraph
.binarySearch(maxV
, Dygraph
.PREFERRED_LOG_TICK_VALUES
, -1);
1714 maxIdx
= Dygraph
.PREFERRED_LOG_TICK_VALUES
.length
- 1;
1716 // Count the number of tick values would appear, if we can get at least
1717 // nTicks / 4 accept them
.
1718 var lastDisplayed
= null;
1719 if (maxIdx
- minIdx
>= nTicks
/ 4) {
1720 var axisId
= axis_props
.yAxisId
;
1721 for (var idx
= maxIdx
; idx
>= minIdx
; idx
--) {
1722 var tickValue
= Dygraph
.PREFERRED_LOG_TICK_VALUES
[idx
];
1723 var domCoord
= axis_props
.g
.toDomYCoord(tickValue
, axisId
);
1724 var tick
= { v
: tickValue
};
1725 if (lastDisplayed
== null) {
1727 tickValue
: tickValue
,
1731 if (domCoord
- lastDisplayed
.domCoord
>= pixelsPerTick
) {
1733 tickValue
: tickValue
,
1742 // Since we went in backwards order.
1747 // ticks.length won't be 0 if the log scale function finds values to insert.
1748 if (ticks
.length
== 0) {
1750 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1751 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks
).
1752 // The first spacing greater than pixelsPerYLabel is what we use.
1753 // TODO(danvk): version that works on a log scale.
1754 if (attr("labelsKMG2")) {
1755 var mults
= [1, 2, 4, 8];
1757 var mults
= [1, 2, 5];
1759 var scale
, low_val
, high_val
, nTicks
;
1760 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1761 var pixelsPerTick
= attr('pixelsPerYLabel');
1762 for (var i
= -10; i
< 50; i
++) {
1763 if (attr("labelsKMG2")) {
1764 var base_scale
= Math
.pow(16, i
);
1766 var base_scale
= Math
.pow(10, i
);
1768 for (var j
= 0; j
< mults
.length
; j
++) {
1769 scale
= base_scale
* mults
[j
];
1770 low_val
= Math
.floor(minV
/ scale
) * scale
;
1771 high_val
= Math
.ceil(maxV
/ scale
) * scale
;
1772 nTicks
= Math
.abs(high_val
- low_val
) / scale
;
1773 var spacing
= self
.height_
/ nTicks
;
1774 // wish I could break out of both loops at once...
1775 if (spacing
> pixelsPerTick
) break;
1777 if (spacing
> pixelsPerTick
) break;
1780 // Construct the set of ticks.
1781 // Allow reverse y-axis if it's explicitly requested.
1782 if (low_val
> high_val
) scale
*= -1;
1783 for (var i
= 0; i
< nTicks
; i
++) {
1784 var tickV
= low_val
+ i
* scale
;
1785 ticks
.push( {v
: tickV
} );
1790 // Add formatted labels to the ticks.
1793 if (attr("labelsKMB")) {
1795 k_labels
= [ "K", "M", "B", "T" ];
1797 if (attr("labelsKMG2")) {
1798 if (k
) self
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1800 k_labels
= [ "k", "M", "G", "T" ];
1802 var formatter
= attr('yAxisLabelFormatter') ?
1803 attr('yAxisLabelFormatter') : attr('yValueFormatter');
1805 // Add labels to the ticks.
1806 for (var i
= 0; i
< ticks
.length
; i
++) {
1807 if (ticks
[i
].label
!== undefined
) continue; // Use current label.
1808 var tickV
= ticks
[i
].v
;
1809 var absTickV
= Math
.abs(tickV
);
1810 var label
= formatter(tickV
, self
);
1811 if (k_labels
.length
> 0) {
1812 // Round up to an appropriate unit.
1814 for (var j
= 3; j
>= 0; j
--, n
/= k
) {
1815 if (absTickV
>= n
) {
1816 label
= Dygraph
.round_(tickV
/ n
, attr('digitsAfterDecimal')) + k_labels
[j
];
1821 ticks
[i
].label
= label
;
1829 * Computes the range of the data series (including confidence intervals).
1830 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
1831 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1832 * @return [low, high]
1834 Dygraph
.prototype.extremeValues_
= function(series
) {
1835 var minY
= null, maxY
= null;
1837 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1839 // With custom bars, maxY is the max of the high values.
1840 for (var j
= 0; j
< series
.length
; j
++) {
1841 var y
= series
[j
][1][0];
1843 var low
= y
- series
[j
][1][1];
1844 var high
= y
+ series
[j
][1][2];
1845 if (low
> y
) low
= y
; // this can happen with custom bars,
1846 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
1847 if (maxY
== null || high
> maxY
) {
1850 if (minY
== null || low
< minY
) {
1855 for (var j
= 0; j
< series
.length
; j
++) {
1856 var y
= series
[j
][1];
1857 if (y
=== null || isNaN(y
)) continue;
1858 if (maxY
== null || y
> maxY
) {
1861 if (minY
== null || y
< minY
) {
1867 return [minY
, maxY
];
1872 * This function is called once when the chart's data is changed or the options
1873 * dictionary is updated. It is _not_ called when the user pans or zooms. The
1874 * idea is that values derived from the chart's data can be computed here,
1875 * rather than every time the chart is drawn. This includes things like the
1876 * number of axes, rolling averages, etc.
1878 Dygraph
.prototype.predraw_
= function() {
1879 var start
= new Date();
1881 // TODO(danvk): move more computations out of drawGraph_ and into here.
1882 this.computeYAxes_();
1884 // Create a new plotter.
1885 if (this.plotter_
) this.plotter_
.clear();
1886 this.plotter_
= new DygraphCanvasRenderer(this,
1891 // The roller sits in the bottom left corner of the chart. We don't know where
1892 // this will be until the options are available, so it's positioned here.
1893 this.createRollInterface_();
1895 // Same thing applies for the labelsDiv. It's right edge should be flush with
1896 // the right edge of the charting area (which may not be the same as the right
1897 // edge of the div, if we have two y-axes.
1898 this.positionLabelsDiv_();
1900 // If the data or options have changed, then we'd better redraw.
1905 * Update the graph with new data. This method is called when the viewing area
1906 * has changed. If the underlying data or options have changed, predraw_ will
1907 * be called before drawGraph_ is called.
1909 * clearSelection, when undefined or true, causes this.clearSelection to be
1910 * called at the end of the draw operation. This should rarely be defined,
1911 * and never true (that is it should be undefined most of the time, and
1916 Dygraph
.prototype.drawGraph_
= function(clearSelection
) {
1917 var start
= new Date();
1919 if (typeof(clearSelection
) === 'undefined') {
1920 clearSelection
= true;
1923 var data
= this.rawData_
;
1925 // This is used to set the second parameter to drawCallback, below.
1926 var is_initial_draw
= this.is_initial_draw_
;
1927 this.is_initial_draw_
= false;
1929 var minY
= null, maxY
= null;
1930 this.layout_
.removeAllDatasets();
1932 this.attrs_
['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
1934 // Loop over the fields (series). Go from the last to the first,
1935 // because if they're stacked that's how we accumulate the values.
1937 var cumulative_y
= []; // For stacked series.
1940 var extremes
= {}; // series name -> [low, high]
1942 // Loop over all fields and create datasets
1943 for (var i
= data
[0].length
- 1; i
>= 1; i
--) {
1944 if (!this.visibility()[i
- 1]) continue;
1946 var seriesName
= this.attr_("labels")[i
];
1947 var connectSeparatedPoints
= this.attr_('connectSeparatedPoints', i
);
1948 var logScale
= this.attr_('logscale', i
);
1951 for (var j
= 0; j
< data
.length
; j
++) {
1952 var date
= data
[j
][0];
1953 var point
= data
[j
][i
];
1955 // On the log scale, points less than zero do not exist.
1956 // This will create a gap in the chart. Note that this ignores
1957 // connectSeparatedPoints.
1961 series
.push([date
, point
]);
1963 if (point
!= null || !connectSeparatedPoints
) {
1964 series
.push([date
, point
]);
1969 // TODO(danvk): move this into predraw_. It's insane to do it here.
1970 series
= this.rollingAverage(series
, this.rollPeriod_
);
1972 // Prune down to the desired range, if necessary (for zooming)
1973 // Because there can be lines going to points outside of the visible area,
1974 // we actually prune to visible points, plus one on either side.
1975 var bars
= this.attr_("errorBars") || this.attr_("customBars");
1976 if (this.dateWindow_
) {
1977 var low
= this.dateWindow_
[0];
1978 var high
= this.dateWindow_
[1];
1980 // TODO(danvk): do binary search instead of linear search.
1981 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
1982 var firstIdx
= null, lastIdx
= null;
1983 for (var k
= 0; k
< series
.length
; k
++) {
1984 if (series
[k
][0] >= low
&& firstIdx
=== null) {
1987 if (series
[k
][0] <= high
) {
1991 if (firstIdx
=== null) firstIdx
= 0;
1992 if (firstIdx
> 0) firstIdx
--;
1993 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
1994 if (lastIdx
< series
.length
- 1) lastIdx
++;
1995 this.boundaryIds_
[i
-1] = [firstIdx
, lastIdx
];
1996 for (var k
= firstIdx
; k
<= lastIdx
; k
++) {
1997 pruned
.push(series
[k
]);
2001 this.boundaryIds_
[i
-1] = [0, series
.length
-1];
2004 var seriesExtremes
= this.extremeValues_(series
);
2007 for (var j
=0; j
<series
.length
; j
++) {
2008 val
= [series
[j
][0], series
[j
][1][0], series
[j
][1][1], series
[j
][1][2]];
2011 } else if (this.attr_("stackedGraph")) {
2012 var l
= series
.length
;
2014 for (var j
= 0; j
< l
; j
++) {
2015 // If one data set has a NaN, let all subsequent stacked
2016 // sets inherit the NaN -- only start at 0 for the first set.
2017 var x
= series
[j
][0];
2018 if (cumulative_y
[x
] === undefined
) {
2019 cumulative_y
[x
] = 0;
2022 actual_y
= series
[j
][1];
2023 cumulative_y
[x
] += actual_y
;
2025 series
[j
] = [x
, cumulative_y
[x
]]
2027 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2028 seriesExtremes
[1] = cumulative_y
[x
];
2030 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2031 seriesExtremes
[0] = cumulative_y
[x
];
2035 extremes
[seriesName
] = seriesExtremes
;
2037 datasets
[i
] = series
;
2040 for (var i
= 1; i
< datasets
.length
; i
++) {
2041 if (!this.visibility()[i
- 1]) continue;
2042 this.layout_
.addDataset(this.attr_("labels")[i
], datasets
[i
]);
2045 this.computeYAxisRanges_(extremes
);
2046 this.layout_
.setYAxes(this.axes_
);
2050 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2051 var tmp_zoomed_x
= this.zoomed_x_
;
2052 // Tell PlotKit to use this new data and render itself
2053 this.layout_
.setDateWindow(this.dateWindow_
);
2054 this.zoomed_x_
= tmp_zoomed_x
;
2055 this.layout_
.evaluateWithError();
2056 this.plotter_
.clear();
2057 this.plotter_
.render();
2058 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2059 this.canvas_
.height
);
2061 if (is_initial_draw
) {
2062 // Generate a static legend before any particular point is selected.
2063 this.setLegendHTML_();
2065 if (clearSelection
) {
2066 if (typeof(this.selPoints_
) !== 'undefined' && this.selPoints_
.length
) {
2067 // We should select the point nearest the page x/y here
, but it
's easier
2068 // to just clear the selection. This prevents erroneous hover dots from
2070 this.clearSelection();
2072 this.clearSelection();
2077 if (this.attr_("drawCallback") !== null) {
2078 this.attr_("drawCallback")(this, is_initial_draw);
2081 if (this.attr_("timingName")) {
2082 var end = new Date();
2084 console.log(this.attr_("timingName") + " - drawGraph: " + (end - start) + "ms")
2091 * Determine properties of the y-axes which are independent of the data
2092 * currently being displayed. This includes things like the number of axes and
2093 * the style of the axes. It does not include the range of each axis and its
2095 * This fills in this.axes_ and this.seriesToAxisMap_.
2096 * axes_ = [ { options } ]
2097 * seriesToAxisMap_ = { seriesName: 0, seriesName2: 1, ... }
2098 * indices are into the axes_ array.
2100 Dygraph.prototype.computeYAxes_ = function() {
2101 // Preserve valueWindow settings if they exist, and if the user hasn't
2102 // specified a new valueRange.
2104 if (this.axes_
!= undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") == false) {
2106 for (var index
= 0; index
< this.axes_
.length
; index
++) {
2107 valueWindows
.push(this.axes_
[index
].valueWindow
);
2112 this.axes_
= [{ yAxisId
: 0, g
: this }]; // always have at least one y-axis.
2113 this.seriesToAxisMap_
= {};
2115 // Get a list of series names.
2116 var labels
= this.attr_("labels");
2118 for (var i
= 1; i
< labels
.length
; i
++) series
[labels
[i
]] = (i
- 1);
2120 // all options which could be applied per-axis:
2128 'axisLabelFontSize',
2133 // Copy global axis options over to the first axis.
2134 for (var i
= 0; i
< axisOptions
.length
; i
++) {
2135 var k
= axisOptions
[i
];
2136 var v
= this.attr_(k
);
2137 if (v
) this.axes_
[0][k
] = v
;
2140 // Go through once and add all the axes.
2141 for (var seriesName
in series
) {
2142 if (!series
.hasOwnProperty(seriesName
)) continue;
2143 var axis
= this.attr_("axis", seriesName
);
2145 this.seriesToAxisMap_
[seriesName
] = 0;
2148 if (typeof(axis
) == 'object') {
2149 // Add a new axis, making a copy of its per-axis options.
2151 Dygraph
.update(opts
, this.axes_
[0]);
2152 Dygraph
.update(opts
, { valueRange
: null }); // shouldn't inherit this.
2153 var yAxisId
= this.axes_
.length
;
2154 opts
.yAxisId
= yAxisId
;
2156 Dygraph
.update(opts
, axis
);
2157 this.axes_
.push(opts
);
2158 this.seriesToAxisMap_
[seriesName
] = yAxisId
;
2162 // Go through one more time and assign series to an axis defined by another
2163 // series, e.g. { 'Y1: { axis: {} }, 'Y2': { axis: 'Y1' } }
2164 for (var seriesName
in series
) {
2165 if (!series
.hasOwnProperty(seriesName
)) continue;
2166 var axis
= this.attr_("axis", seriesName
);
2167 if (typeof(axis
) == 'string') {
2168 if (!this.seriesToAxisMap_
.hasOwnProperty(axis
)) {
2169 this.error("Series " + seriesName
+ " wants to share a y-axis with " +
2170 "series " + axis
+ ", which does not define its own axis.");
2173 var idx
= this.seriesToAxisMap_
[axis
];
2174 this.seriesToAxisMap_
[seriesName
] = idx
;
2178 // Now we remove series from seriesToAxisMap_ which are not visible. We do
2179 // this last so that hiding the first series doesn't destroy the axis
2180 // properties of the primary axis.
2181 var seriesToAxisFiltered
= {};
2182 var vis
= this.visibility();
2183 for (var i
= 1; i
< labels
.length
; i
++) {
2185 if (vis
[i
- 1]) seriesToAxisFiltered
[s
] = this.seriesToAxisMap_
[s
];
2187 this.seriesToAxisMap_
= seriesToAxisFiltered
;
2189 if (valueWindows
!= undefined
) {
2190 // Restore valueWindow settings.
2191 for (var index
= 0; index
< valueWindows
.length
; index
++) {
2192 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2198 * Returns the number of y-axes on the chart.
2199 * @return {Number} the number of axes.
2201 Dygraph
.prototype.numAxes
= function() {
2203 for (var series
in this.seriesToAxisMap_
) {
2204 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2205 var idx
= this.seriesToAxisMap_
[series
];
2206 if (idx
> last_axis
) last_axis
= idx
;
2208 return 1 + last_axis
;
2213 * Returns axis properties for the given series.
2214 * @param { String } setName The name of the series for which to get axis
2215 * properties, e.g. 'Y1'.
2216 * @return { Object } The axis properties.
2218 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2219 // TODO(danvk): handle errors.
2220 return this.axes_
[this.seriesToAxisMap_
[series
]];
2225 * Determine the value range and tick marks for each axis.
2226 * @param {Object} extremes A mapping from seriesName -> [low, high]
2227 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2229 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2230 // Build a map from axis number -> [list of series names]
2231 var seriesForAxis
= [];
2232 for (var series
in this.seriesToAxisMap_
) {
2233 if (!this.seriesToAxisMap_
.hasOwnProperty(series
)) continue;
2234 var idx
= this.seriesToAxisMap_
[series
];
2235 while (seriesForAxis
.length
<= idx
) seriesForAxis
.push([]);
2236 seriesForAxis
[idx
].push(series
);
2239 // Compute extreme values, a span and tick marks for each axis.
2240 for (var i
= 0; i
< this.axes_
.length
; i
++) {
2241 var axis
= this.axes_
[i
];
2243 if (!seriesForAxis
[i
]) {
2244 // If no series are defined or visible then use a reasonable default
2245 axis
.extremeRange
= [0, 1];
2247 // Calculate the extremes of extremes.
2248 var series
= seriesForAxis
[i
];
2249 var minY
= Infinity
; // extremes[series[0]][0];
2250 var maxY
= -Infinity
; // extremes[series[0]][1];
2251 var extremeMinY
, extremeMaxY
;
2252 for (var j
= 0; j
< series
.length
; j
++) {
2253 // Only use valid extremes to stop null data series' from corrupting the scale.
2254 extremeMinY
= extremes
[series
[j
]][0];
2255 if (extremeMinY
!= null) {
2256 minY
= Math
.min(extremeMinY
, minY
);
2258 extremeMaxY
= extremes
[series
[j
]][1];
2259 if (extremeMaxY
!= null) {
2260 maxY
= Math
.max(extremeMaxY
, maxY
);
2263 if (axis
.includeZero
&& minY
> 0) minY
= 0;
2265 // Ensure we have a valid scale, otherwise defualt to zero for safety.
2266 if (minY
== Infinity
) minY
= 0;
2267 if (maxY
== -Infinity
) maxY
= 0;
2269 // Add some padding and round up to an integer to be human-friendly.
2270 var span
= maxY
- minY
;
2271 // special case: if we have no sense of scale, use +/-10% of the sole value
.
2272 if (span
== 0) { span
= maxY
; }
2276 if (axis
.logscale
) {
2277 var maxAxisY
= maxY
+ 0.1 * span
;
2278 var minAxisY
= minY
;
2280 var maxAxisY
= maxY
+ 0.1 * span
;
2281 var minAxisY
= minY
- 0.1 * span
;
2283 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
2284 if (!this.attr_("avoidMinZero")) {
2285 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2286 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2289 if (this.attr_("includeZero")) {
2290 if (maxY
< 0) maxAxisY
= 0;
2291 if (minY
> 0) minAxisY
= 0;
2294 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2296 if (axis
.valueWindow
) {
2297 // This is only set if the user has zoomed on the y-axis. It is never set
2298 // by a user. It takes precedence over axis.valueRange because, if you set
2299 // valueRange, you'd still expect to be able to pan.
2300 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2301 } else if (axis
.valueRange
) {
2302 // This is a user-set value range for this axis.
2303 axis
.computedValueRange
= [axis
.valueRange
[0], axis
.valueRange
[1]];
2305 axis
.computedValueRange
= axis
.extremeRange
;
2308 // Add ticks. By default, all axes inherit the tick positions of the
2309 // primary axis. However, if an axis is specifically marked as having
2310 // independent ticks, then that is permissible as well.
2311 if (i
== 0 || axis
.independentTicks
) {
2313 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2314 axis
.computedValueRange
[1],
2318 var p_axis
= this.axes_
[0];
2319 var p_ticks
= p_axis
.ticks
;
2320 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2321 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2322 var tick_values
= [];
2323 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2324 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2325 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2326 tick_values
.push(y_val
);
2330 Dygraph
.numericTicks(axis
.computedValueRange
[0],
2331 axis
.computedValueRange
[1],
2332 this, axis
, tick_values
);
2339 * Calculates the rolling average of a data set.
2340 * If originalData is [label, val], rolls the average of those.
2341 * If originalData is [label, [, it's interpreted as [value, stddev]
2342 * and the roll is returned in the same form, with appropriately reduced
2343 * stddev for each value.
2344 * Note that this is where fractional input (i.e. '5/10') is converted into
2346 * @param {Array} originalData The data in the appropriate format (see above)
2347 * @param {Number} rollPeriod The number of points over which to average the
2350 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2351 if (originalData
.length
< 2)
2352 return originalData
;
2353 var rollPeriod
= Math
.min(rollPeriod
, originalData
.length
- 1);
2354 var rollingData
= [];
2355 var sigma
= this.attr_("sigma");
2357 if (this.fractions_
) {
2359 var den
= 0; // numerator/denominator
2361 for (var i
= 0; i
< originalData
.length
; i
++) {
2362 num
+= originalData
[i
][1][0];
2363 den
+= originalData
[i
][1][1];
2364 if (i
- rollPeriod
>= 0) {
2365 num
-= originalData
[i
- rollPeriod
][1][0];
2366 den
-= originalData
[i
- rollPeriod
][1][1];
2369 var date
= originalData
[i
][0];
2370 var value
= den
? num
/ den
: 0.0;
2371 if (this.attr_("errorBars")) {
2372 if (this.wilsonInterval_
) {
2373 // For more details on this confidence interval, see:
2374 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2376 var p
= value
< 0 ? 0 : value
, n
= den
;
2377 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2378 var denom
= 1 + sigma
* sigma
/ den
;
2379 var low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2380 var high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2381 rollingData
[i
] = [date
,
2382 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2384 rollingData
[i
] = [date
, [0, 0, 0]];
2387 var stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2388 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2391 rollingData
[i
] = [date
, mult
* value
];
2394 } else if (this.attr_("customBars")) {
2399 for (var i
= 0; i
< originalData
.length
; i
++) {
2400 var data
= originalData
[i
][1];
2402 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2404 if (y
!= null && !isNaN(y
)) {
2410 if (i
- rollPeriod
>= 0) {
2411 var prev
= originalData
[i
- rollPeriod
];
2412 if (prev
[1][1] != null && !isNaN(prev
[1][1])) {
2420 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2421 1.0 * (mid
- low
) / count
,
2422 1.0 * (high
- mid
) / count
]];
2424 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2428 // Calculate the rolling average for the first rollPeriod - 1 points where
2429 // there is not enough data to roll over the full number of points
2430 var num_init_points
= Math
.min(rollPeriod
- 1, originalData
.length
- 2);
2431 if (!this.attr_("errorBars")){
2432 if (rollPeriod
== 1) {
2433 return originalData
;
2436 for (var i
= 0; i
< originalData
.length
; i
++) {
2439 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2440 var y
= originalData
[j
][1];
2441 if (y
== null || isNaN(y
)) continue;
2443 sum
+= originalData
[j
][1];
2446 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2448 rollingData
[i
] = [originalData
[i
][0], null];
2453 for (var i
= 0; i
< originalData
.length
; i
++) {
2457 for (var j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2458 var y
= originalData
[j
][1][0];
2459 if (y
== null || isNaN(y
)) continue;
2461 sum
+= originalData
[j
][1][0];
2462 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2465 var stddev
= Math
.sqrt(variance
) / num_ok
;
2466 rollingData
[i
] = [originalData
[i
][0],
2467 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2469 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2479 * Detects the type of the str (date or numeric) and sets the various
2480 * formatting attributes in this.attrs_ based on this type.
2481 * @param {String} str An x value.
2484 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2486 if (str
.indexOf('-') > 0 ||
2487 str
.indexOf('/') >= 0 ||
2488 isNaN(parseFloat(str
))) {
2490 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2491 // TODO(danvk): remove support for this format.
2496 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2497 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2498 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2499 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2501 // TODO(danvk): use Dygraph.numberFormatter here?
2502 /** @private (shut up, jsdoc!) */
2503 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2504 /** @private (shut up, jsdoc!) */
2505 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2506 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2507 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2512 * Parses the value as a floating point number. This is like the parseFloat()
2513 * built-in, but with a few differences:
2514 * - the empty string is parsed as null, rather than NaN.
2515 * - if the string cannot be parsed at all, an error is logged.
2516 * If the string can't be parsed, this method returns null.
2517 * @param {String} x The string to be parsed
2518 * @param {Number} opt_line_no The line number from which the string comes.
2519 * @param {String} opt_line The text of the line from which the string comes.
2523 // Parse the x as a float or return null if it's not a number.
2524 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2525 var val
= parseFloat(x
);
2526 if (!isNaN(val
)) return val
;
2528 // Try to figure out what happeend.
2529 // If the value is the empty string, parse it as null.
2530 if (/^ *$/.test(x
)) return null;
2532 // If it was actually "NaN", return it as NaN.
2533 if (/^ *nan *$/i.test(x
)) return NaN
;
2535 // Looks like a parsing error.
2536 var msg
= "Unable to parse '" + x
+ "' as a number";
2537 if (opt_line
!== null && opt_line_no
!== null) {
2538 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
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 {[Object]} data See above.
2554 * @return [Object] An array with one entry for each row. These entries
2555 * are an array of cells in that row. The first entry is the parsed x-value for
2556 * the row. The second, third, etc. are the y-values. These can take on one of
2557 * three forms, depending on the CSV and constructor parameters:
2559 * 2. [ value, stddev ]
2560 * 3. [ low value, center value, high value ]
2562 Dygraph
.prototype.parseCSV_
= function(data
) {
2564 var lines
= data
.split("\n");
2566 // Use the default delimiter or fall back to a tab if that makes sense.
2567 var delim
= this.attr_('delimiter');
2568 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2573 if (!('labels' in this.user_attrs_
)) {
2574 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2576 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2581 var defaultParserSet
= false; // attempt to auto-detect x value type
2582 var expectedCols
= this.attr_("labels").length
;
2583 var outOfOrder
= false;
2584 for (var i
= start
; i
< lines
.length
; i
++) {
2585 var line
= lines
[i
];
2587 if (line
.length
== 0) continue; // skip blank lines
2588 if (line
[0] == '#') continue; // skip comment lines
2589 var inFields
= line
.split(delim
);
2590 if (inFields
.length
< 2) continue;
2593 if (!defaultParserSet
) {
2594 this.detectTypeFromString_(inFields
[0]);
2595 xParser
= this.attr_("xValueParser");
2596 defaultParserSet
= true;
2598 fields
[0] = xParser(inFields
[0], this);
2600 // If fractions are expected, parse the numbers as "A/B
"
2601 if (this.fractions_) {
2602 for (var j = 1; j < inFields.length; j++) {
2603 // TODO(danvk): figure out an appropriate way to flag parse errors.
2604 var vals = inFields[j].split("/");
2605 if (vals.length != 2) {
2606 this.error('Expected fractional "num
/den
" values in CSV data ' +
2607 "but found a value
'" + inFields[j] + "' on line
" +
2608 (1 + i) + " ('" + line + "') which is not of
this form
.");
2611 fields[j] = [this.parseFloat_(vals[0], i, line),
2612 this.parseFloat_(vals[1], i, line)];
2615 } else if (this.attr_("errorBars
")) {
2616 // If there are error bars, values are (value, stddev) pairs
2617 if (inFields.length % 2 != 1) {
2618 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2619 'but line ' + (1 + i) + ' has an odd number of values (' +
2620 (inFields.length - 1) + "): '" + line + "'");
2622 for (var j = 1; j < inFields.length; j += 2) {
2623 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
2624 this.parseFloat_(inFields[j + 1], i, line)];
2626 } else if (this.attr_("customBars
")) {
2627 // Bars are a low;center;high tuple
2628 for (var j = 1; j < inFields.length; j++) {
2629 var val = inFields[j];
2630 if (/^ *$/.test(val)) {
2631 fields[j] = [null, null, null];
2633 var vals = val.split(";");
2634 if (vals.length == 3) {
2635 fields[j] = [ this.parseFloat_(vals[0], i, line),
2636 this.parseFloat_(vals[1], i, line),
2637 this.parseFloat_(vals[2], i, line) ];
2639 this.warning('When using customBars, values must be either blank ' +
2640 'or "low
;center
;high
" tuples (got "' + val +
2641 '" on line ' + (1+i));
2646 // Values are just numbers
2647 for (var j = 1; j < inFields.length; j++) {
2648 fields[j] = this.parseFloat_(inFields[j], i, line);
2651 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
2655 if (fields.length != expectedCols) {
2656 this.error("Number of columns
in line
" + i + " (" + fields.length +
2657 ") does not agree
with number of
labels (" + expectedCols +
2661 // If the user specified the 'labels' option and none of the cells of the
2662 // first row parsed correctly, then they probably double-specified the
2663 // labels. We go with the values set in the option, discard this row and
2664 // log a warning to the JS console.
2665 if (i == 0 && this.attr_('labels')) {
2666 var all_null = true;
2667 for (var j = 0; all_null && j < fields.length; j++) {
2668 if (fields[j]) all_null = false;
2671 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
2672 "CSV
data ('" + line + "') appears to also contain labels
. " +
2673 "Will drop the CSV labels and
use the option labels
.");
2681 this.warn("CSV is out of order
; order it correctly to speed loading
.");
2682 ret.sort(function(a,b) { return a[0] - b[0] });
2690 * The user has provided their data as a pre-packaged JS array. If the x values
2691 * are numeric, this is the same as dygraphs' internal format. If the x values
2692 * are dates, we need to convert them from Date objects to ms since epoch.
2693 * @param {[Object]} data
2694 * @return {[Object]} data with numeric x values.
2696 Dygraph.prototype.parseArray_ = function(data) {
2697 // Peek at the first x value to see if it's numeric.
2698 if (data.length == 0) {
2699 this.error("Can
't plot empty data set");
2702 if (data[0].length == 0) {
2703 this.error("Data set cannot contain an empty row");
2707 if (this.attr_("labels") == null) {
2708 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
2709 "in the options parameter");
2710 this.attrs_.labels = [ "X" ];
2711 for (var i = 1; i < data[0].length; i++) {
2712 this.attrs_.labels.push("Y" + i);
2716 if (Dygraph.isDateLike(data[0][0])) {
2717 // Some intelligent defaults for a date x-axis.
2718 this.attrs_.xValueFormatter = Dygraph.dateString_;
2719 this.attrs_.xAxisLabelFormatter = Dygraph.dateAxisFormatter;
2720 this.attrs_.xTicker = Dygraph.dateTicker;
2722 // Assume they're all dates
.
2723 var parsedData
= Dygraph
.clone(data
);
2724 for (var i
= 0; i
< data
.length
; i
++) {
2725 if (parsedData
[i
].length
== 0) {
2726 this.error("Row " + (1 + i
) + " of data is empty");
2729 if (parsedData
[i
][0] == null
2730 || typeof(parsedData
[i
][0].getTime
) != 'function'
2731 || isNaN(parsedData
[i
][0].getTime())) {
2732 this.error("x value in row " + (1 + i
) + " is not a Date");
2735 parsedData
[i
][0] = parsedData
[i
][0].getTime();
2739 // Some intelligent defaults for a numeric x-axis.
2740 /** @private (shut up, jsdoc!) */
2741 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2742 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2748 * Parses a DataTable object from gviz.
2749 * The data is expected to have a first column that is either a date or a
2750 * number. All subsequent columns must be numbers. If there is a clear mismatch
2751 * between this.xValueParser_ and the type of the first column, it will be
2752 * fixed. Fills out rawData_.
2753 * @param {[Object]} data See above.
2756 Dygraph
.prototype.parseDataTable_
= function(data
) {
2757 var cols
= data
.getNumberOfColumns();
2758 var rows
= data
.getNumberOfRows();
2760 var indepType
= data
.getColumnType(0);
2761 if (indepType
== 'date' || indepType
== 'datetime') {
2762 this.attrs_
.xValueFormatter
= Dygraph
.dateString_
;
2763 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2764 this.attrs_
.xTicker
= Dygraph
.dateTicker
;
2765 this.attrs_
.xAxisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2766 } else if (indepType
== 'number') {
2767 this.attrs_
.xValueFormatter
= function(x
) { return x
; };
2768 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2769 this.attrs_
.xTicker
= Dygraph
.numericTicks
;
2770 this.attrs_
.xAxisLabelFormatter
= this.attrs_
.xValueFormatter
;
2772 this.error("only 'date', 'datetime' and 'number' types are supported for " +
2773 "column 1 of DataTable input (Got '" + indepType
+ "')");
2777 // Array of the column indices which contain data (and not annotations).
2779 var annotationCols
= {}; // data index -> [annotation cols]
2780 var hasAnnotations
= false;
2781 for (var i
= 1; i
< cols
; i
++) {
2782 var type
= data
.getColumnType(i
);
2783 if (type
== 'number') {
2785 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
2786 // This is OK -- it's an annotation column.
2787 var dataIdx
= colIdx
[colIdx
.length
- 1];
2788 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
2789 annotationCols
[dataIdx
] = [i
];
2791 annotationCols
[dataIdx
].push(i
);
2793 hasAnnotations
= true;
2795 this.error("Only 'number' is supported as a dependent type with Gviz." +
2796 " 'string' is only supported if displayAnnotations is true");
2800 // Read column labels
2801 // TODO(danvk): add support back for errorBars
2802 var labels
= [data
.getColumnLabel(0)];
2803 for (var i
= 0; i
< colIdx
.length
; i
++) {
2804 labels
.push(data
.getColumnLabel(colIdx
[i
]));
2805 if (this.attr_("errorBars")) i
+= 1;
2807 this.attrs_
.labels
= labels
;
2808 cols
= labels
.length
;
2811 var outOfOrder
= false;
2812 var annotations
= [];
2813 for (var i
= 0; i
< rows
; i
++) {
2815 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
2816 data
.getValue(i
, 0) === null) {
2817 this.warn("Ignoring row " + i
+
2818 " of DataTable because of undefined or null first column.");
2822 if (indepType
== 'date' || indepType
== 'datetime') {
2823 row
.push(data
.getValue(i
, 0).getTime());
2825 row
.push(data
.getValue(i
, 0));
2827 if (!this.attr_("errorBars")) {
2828 for (var j
= 0; j
< colIdx
.length
; j
++) {
2829 var col
= colIdx
[j
];
2830 row
.push(data
.getValue(i
, col
));
2831 if (hasAnnotations
&&
2832 annotationCols
.hasOwnProperty(col
) &&
2833 data
.getValue(i
, annotationCols
[col
][0]) != null) {
2835 ann
.series
= data
.getColumnLabel(col
);
2837 ann
.shortText
= String
.fromCharCode(65 /* A */ + annotations
.length
)
2839 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
2840 if (k
) ann
.text
+= "\n";
2841 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
2843 annotations
.push(ann
);
2847 // Strip out infinities, which give dygraphs problems later on.
2848 for (var j
= 0; j
< row
.length
; j
++) {
2849 if (!isFinite(row
[j
])) row
[j
] = null;
2852 for (var j
= 0; j
< cols
- 1; j
++) {
2853 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
2856 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
2863 this.warn("DataTable is out of order; order it correctly to speed loading.");
2864 ret
.sort(function(a
,b
) { return a
[0] - b
[0] });
2866 this.rawData_
= ret
;
2868 if (annotations
.length
> 0) {
2869 this.setAnnotations(annotations
, true);
2874 * Get the CSV data. If it's in a function, call that function. If it's in a
2875 * file, do an XMLHttpRequest to get it.
2878 Dygraph
.prototype.start_
= function() {
2879 if (typeof this.file_
== 'function') {
2880 // CSV string. Pretend we got it via XHR.
2881 this.loadedEvent_(this.file_());
2882 } else if (Dygraph
.isArrayLike(this.file_
)) {
2883 this.rawData_
= this.parseArray_(this.file_
);
2885 } else if (typeof this.file_
== 'object' &&
2886 typeof this.file_
.getColumnRange
== 'function') {
2887 // must be a DataTable from gviz.
2888 this.parseDataTable_(this.file_
);
2890 } else if (typeof this.file_
== 'string') {
2891 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
2892 if (this.file_
.indexOf('\n') >= 0) {
2893 this.loadedEvent_(this.file_
);
2895 var req
= new XMLHttpRequest();
2897 req
.onreadystatechange
= function () {
2898 if (req
.readyState
== 4) {
2899 if (req
.status
== 200 || // Normal http
2900 req
.status
== 0) { // Chrome w/ --allow
-file
-access
-from
-files
2901 caller
.loadedEvent_(req
.responseText
);
2906 req
.open("GET", this.file_
, true);
2910 this.error("Unknown data format: " + (typeof this.file_
));
2915 * Changes various properties of the graph. These can include:
2917 * <li>file: changes the source data for the graph</li>
2918 * <li>errorBars: changes whether the data contains stddev</li>
2921 * There's a huge variety of options that can be passed to this method. For a
2922 * full list, see http://dygraphs.com/options.html.
2924 * @param {Object} attrs The new properties and values
2925 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
2926 * call to updateOptions(). If you know better, you can pass true to explicitly
2927 * block the redraw. This can be useful for chaining updateOptions() calls,
2928 * avoiding the occasional infinite loop and preventing redraws when it's not
2929 * necessary (e.g. when updating a callback).
2931 Dygraph
.prototype.updateOptions
= function(attrs
, block_redraw
) {
2932 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
2934 // TODO(danvk): this is a mess. Move these options into attr_.
2935 if ('rollPeriod' in attrs
) {
2936 this.rollPeriod_
= attrs
.rollPeriod
;
2938 if ('dateWindow' in attrs
) {
2939 this.dateWindow_
= attrs
.dateWindow
;
2940 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
2941 this.zoomed_x_
= attrs
.dateWindow
!= null;
2944 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
2945 this.zoomed_y_
= attrs
.valueRange
!= null;
2948 // TODO(danvk): validate per-series options.
2953 // highlightCircleSize
2955 Dygraph
.update(this.user_attrs_
, attrs
);
2957 if (attrs
['file']) {
2958 this.file_
= attrs
['file'];
2959 if (!block_redraw
) this.start_();
2961 if (!block_redraw
) this.predraw_();
2966 * Resizes the dygraph. If no parameters are specified, resizes to fill the
2967 * containing div (which has presumably changed size since the dygraph was
2968 * instantiated. If the width/height are specified, the div will be resized.
2970 * This is far more efficient than destroying and re-instantiating a
2971 * Dygraph, since it doesn't have to reparse the underlying data.
2973 * @param {Number} [width] Width (in pixels)
2974 * @param {Number} [height] Height (in pixels)
2976 Dygraph
.prototype.resize
= function(width
, height
) {
2977 if (this.resize_lock
) {
2980 this.resize_lock
= true;
2982 if ((width
=== null) != (height
=== null)) {
2983 this.warn("Dygraph.resize() should be called with zero parameters or " +
2984 "two non-NULL parameters. Pretending it was zero.");
2985 width
= height
= null;
2988 // TODO(danvk): there should be a clear() method.
2989 this.maindiv_
.innerHTML
= "";
2990 this.attrs_
.labelsDiv
= null;
2993 this.maindiv_
.style
.width
= width
+ "px";
2994 this.maindiv_
.style
.height
= height
+ "px";
2995 this.width_
= width
;
2996 this.height_
= height
;
2998 this.width_
= this.maindiv_
.offsetWidth
;
2999 this.height_
= this.maindiv_
.offsetHeight
;
3002 this.createInterface_();
3005 this.resize_lock
= false;
3009 * Adjusts the number of points in the rolling average. Updates the graph to
3010 * reflect the new averaging period.
3011 * @param {Number} length Number of points over which to average the data.
3013 Dygraph
.prototype.adjustRoll
= function(length
) {
3014 this.rollPeriod_
= length
;
3019 * Returns a boolean array of visibility statuses.
3021 Dygraph
.prototype.visibility
= function() {
3022 // Do lazy-initialization, so that this happens after we know the number of
3024 if (!this.attr_("visibility")) {
3025 this.attrs_
["visibility"] = [];
3027 while (this.attr_("visibility").length
< this.rawData_
[0].length
- 1) {
3028 this.attr_("visibility").push(true);
3030 return this.attr_("visibility");
3034 * Changes the visiblity of a series.
3036 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3037 var x
= this.visibility();
3038 if (num
< 0 || num
>= x
.length
) {
3039 this.warn("invalid series number in setVisibility: " + num
);
3047 * How large of an area will the dygraph render itself in?
3048 * This is used for testing.
3049 * @return A {width: w, height: h} object.
3052 Dygraph
.prototype.size
= function() {
3053 return { width
: this.width_
, height
: this.height_
};
3057 * Update the list of annotations and redraw the chart.
3059 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3060 // Only add the annotation CSS rule once we know it will be used.
3061 Dygraph
.addAnnotationRule();
3062 this.annotations_
= ann
;
3063 this.layout_
.setAnnotations(this.annotations_
);
3064 if (!suppressDraw
) {
3070 * Return the list of annotations.
3072 Dygraph
.prototype.annotations
= function() {
3073 return this.annotations_
;
3077 * Get the index of a series (column) given its name. The first column is the
3078 * x-axis, so the data series start with index 1.
3080 Dygraph
.prototype.indexFromSetName
= function(name
) {
3081 var labels
= this.attr_("labels");
3082 for (var i
= 0; i
< labels
.length
; i
++) {
3083 if (labels
[i
] == name
) return i
;
3090 * Adds a default style for the annotation CSS classes to the document. This is
3091 * only executed when annotations are actually used. It is designed to only be
3092 * called once -- all calls after the first will return immediately.
3094 Dygraph
.addAnnotationRule
= function() {
3095 if (Dygraph
.addedAnnotationCSS
) return;
3097 var rule
= "border: 1px solid black; " +
3098 "background-color: white; " +
3099 "text-align: center;";
3101 var styleSheetElement
= document
.createElement("style");
3102 styleSheetElement
.type
= "text/css";
3103 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3105 // Find the first style sheet that we can access.
3106 // We may not add a rule to a style sheet from another domain for security
3107 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3108 // adds its own style sheets from google.com.
3109 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3110 if (document
.styleSheets
[i
].disabled
) continue;
3111 var mysheet
= document
.styleSheets
[i
];
3113 if (mysheet
.insertRule
) { // Firefox
3114 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3115 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3116 } else if (mysheet
.addRule
) { // IE
3117 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3119 Dygraph
.addedAnnotationCSS
= true;
3122 // Was likely a security exception.
3126 this.warn("Unable to add default annotation CSS rule; display may be off.");
3129 // Older pages may still use this name.
3130 DateGraph
= Dygraph
;