3 * Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
8 * @fileoverview Creates an interactive, zoomable graph based on a CSV file or
9 * string. Dygraph can handle multiple series with or without error bars. The
10 * date/value ranges will be automatically set. Dygraph uses the
11 * <canvas> tag, so it only works in FF1.5+.
12 * @author danvdk@gmail.com (Dan Vanderkam)
15 <div id="graphdiv" style="width:800px; height:500px;"></div>
16 <script type="text/javascript">
17 new Dygraph(document.getElementById("graphdiv"),
18 "datafile.csv", // CSV file with headers
22 The CSV file is of the form
24 Date,SeriesA,SeriesB,SeriesC
28 If the 'errorBars' option is set in the constructor, the input should be of
30 Date,SeriesA,SeriesB,...
31 YYYYMMDD,A1,sigmaA1,B1,sigmaB1,...
32 YYYYMMDD,A2,sigmaA2,B2,sigmaB2,...
34 If the 'fractions' option is set, the input should be of the form:
36 Date,SeriesA,SeriesB,...
37 YYYYMMDD,A1/B1,A2/B2,...
38 YYYYMMDD,A1/B1,A2/B2,...
40 And error bars will be calculated automatically using a binomial distribution.
42 For further documentation and examples, see http://dygraphs.com/
46 /*jshint globalstrict: true */
47 /*global DygraphLayout:false, DygraphCanvasRenderer:false, DygraphOptions:false, G_vmlCanvasManager:false */
51 * Creates an interactive, zoomable chart.
54 * @param {div | String} div A div or the id of a div into which to construct
56 * @param {String | Function} file A file containing CSV data or a function
57 * that returns this data. The most basic expected format for each line is
58 * "YYYY/MM/DD,val1,val2,...". For more information, see
59 * http://dygraphs.com/data.html.
60 * @param {Object} attrs Various other attributes, e.g. errorBars determines
61 * whether the input data contains error ranges. For a complete list of
62 * options, see http://dygraphs.com/options.html.
64 var Dygraph
= function(div
, data
, opts
, opt_fourth_param
) {
65 if (opt_fourth_param
!== undefined
) {
66 // Old versions of dygraphs took in the series labels as a constructor
67 // parameter. This doesn't make sense anymore, but it's easy to continue
68 // to support this usage.
69 this.warn("Using deprecated four-argument dygraph constructor");
70 this.__old_init__(div
, data
, opts
, opt_fourth_param
);
72 this.__init__(div
, data
, opts
);
76 Dygraph
.NAME
= "Dygraph";
77 Dygraph
.VERSION
= "1.2";
78 Dygraph
.__repr__
= function() {
79 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
83 * Returns information about the Dygraph class.
85 Dygraph
.toString
= function() {
86 return this.__repr__();
89 // Various default values
90 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
91 Dygraph
.DEFAULT_WIDTH
= 480;
92 Dygraph
.DEFAULT_HEIGHT
= 320;
94 // For max 60 Hz. animation:
95 Dygraph
.ANIMATION_STEPS
= 12;
96 Dygraph
.ANIMATION_DURATION
= 200;
98 // Label constants for the labelsKMB and labelsKMG2 options.
99 // (i.e. '100000' -> '100K')
100 Dygraph
.KMB_LABELS
= [ 'K', 'M', 'B', 'T', 'Q' ];
101 Dygraph
.KMG2_BIG_LABELS
= [ 'k', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y' ];
102 Dygraph
.KMG2_SMALL_LABELS
= [ 'm', 'u', 'n', 'p', 'f', 'a', 'z', 'y' ];
104 // These are defined before DEFAULT_ATTRS so that it can refer to them.
107 * Return a string version of a number. This respects the digitsAfterDecimal
108 * and maxNumberWidth options.
109 * @param {Number} x The number to be formatted
110 * @param {Dygraph} opts An options view
111 * @param {String} name The name of the point's data series
112 * @param {Dygraph} g The dygraph object
114 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
115 var sigFigs
= opts('sigFigs');
117 if (sigFigs
!== null) {
118 // User has opted for a fixed number of significant figures.
119 return Dygraph
.floatFormat(x
, sigFigs
);
122 var digits
= opts('digitsAfterDecimal');
123 var maxNumberWidth
= opts('maxNumberWidth');
125 var kmb
= opts('labelsKMB');
126 var kmg2
= opts('labelsKMG2');
130 // switch to scientific notation if we underflow or overflow fixed display.
132 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
133 Math
.abs(x
) < Math
.pow(10, -digits
))) {
134 label
= x
.toExponential(digits
);
136 label
= '' + Dygraph
.round_(x
, digits
);
145 k_labels
= Dygraph
.KMB_LABELS
;
148 if (kmb
) Dygraph
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
150 k_labels
= Dygraph
.KMG2_BIG_LABELS
;
151 m_labels
= Dygraph
.KMG2_SMALL_LABELS
;
154 var absx
= Math
.abs(x
);
155 var n
= Dygraph
.pow(k
, k_labels
.length
);
156 for (var j
= k_labels
.length
- 1; j
>= 0; j
--, n
/= k
) {
158 label
= Dygraph
.round_(x
/ n
, digits
) + k_labels
[j
];
163 // TODO(danvk): clean up this logic. Why so different than kmb?
164 var x_parts
= String(x
.toExponential()).split('e-');
165 if (x_parts
.length
=== 2 && x_parts
[1] >= 3 && x_parts
[1] <= 24) {
166 if (x_parts
[1] % 3 > 0) {
167 label
= Dygraph
.round_(x_parts
[0] /
168 Dygraph
.pow(10, (x_parts
[1] % 3)),
171 label
= Number(x_parts
[0]).toFixed(2);
173 label
+= m_labels
[Math
.floor(x_parts
[1] / 3) - 1];
182 * variant for use as an axisLabelFormatter.
185 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
186 return Dygraph
.numberValueFormatter(x
, opts
, g
);
190 * Convert a JS date (millis since epoch) to YYYY/MM/DD
191 * @param {Number} date The JavaScript date (ms since epoch)
192 * @return {String} A date of the form "YYYY/MM/DD"
195 Dygraph
.dateString_
= function(date
) {
196 var zeropad
= Dygraph
.zeropad
;
197 var d
= new Date(date
);
200 var year
= "" + d
.getFullYear();
201 // Get a 0 padded month string
202 var month
= zeropad(d
.getMonth() + 1); //months are 0-offset, sigh
203 // Get a 0 padded day string
204 var day
= zeropad(d
.getDate());
207 var frac
= d
.getHours() * 3600 + d
.getMinutes() * 60 + d
.getSeconds();
208 if (frac
) ret
= " " + Dygraph
.hmsString_(date
);
210 return year
+ "/" + month + "/" + day
+ ret
;
214 * Convert a JS date to a string appropriate to display on an axis that
215 * is displaying values at the stated granularity.
216 * @param {Date} date The date to format
217 * @param {Number} granularity One of the Dygraph granularity constants
218 * @return {String} The formatted date
221 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
222 if (granularity
>= Dygraph
.DECADAL
) {
223 return date
.strftime('%Y');
224 } else if (granularity
>= Dygraph
.MONTHLY
) {
225 return date
.strftime('%b %y');
227 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
228 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
229 return new Date(date
.getTime() + 3600*1000).strftime('%d%b');
231 return Dygraph
.hmsString_(date
.getTime());
237 * Standard plotters. These may be used by clients.
238 * Available plotters are:
239 * - Dygraph.Plotters.linePlotter: draws central lines (most common)
240 * - Dygraph.Plotters.errorPlotter: draws error bars
241 * - Dygraph.Plotters.fillPlotter: draws fills under lines (used with fillGraph)
243 * By default, the plotter is [fillPlotter, errorPlotter, linePlotter].
244 * This causes all the lines to be drawn over all the fills/error bars.
246 Dygraph
.Plotters
= DygraphCanvasRenderer
._Plotters
;
249 // Default attribute values.
250 Dygraph
.DEFAULT_ATTRS
= {
251 highlightCircleSize
: 3,
252 highlightSeriesOpts
: null,
253 highlightSeriesBackgroundAlpha
: 0.5,
257 // TODO(danvk): move defaults from createStatusMessage_ here.
259 labelsSeparateLines
: false,
260 labelsShowZeroValues
: true,
263 showLabelsOnHighlight
: true,
265 digitsAfterDecimal
: 2,
270 strokeBorderWidth
: 0,
271 strokeBorderColor
: "white",
274 axisLabelFontSize
: 14,
280 xValueParser
: Dygraph
.dateParser
,
287 wilsonInterval
: true, // only relevant if fractions is true
291 connectSeparatedPoints
: false,
294 hideOverlayOnMouseOut
: true,
296 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
297 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
303 drawAxesAtZero
: false,
305 // Sizes of the various chart labels.
312 axisLineColor
: "black",
315 axisLabelColor
: "black",
316 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
320 gridLineColor
: "rgb(128,128,128)",
322 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
323 animatedZooms
: false, // (for now)
325 // Range selector options
326 showRangeSelector
: false,
327 rangeSelectorHeight
: 40,
328 rangeSelectorPlotStrokeColor
: "#808FAB",
329 rangeSelectorPlotFillColor
: "#A7B1C4",
331 // The ordering here ensures that central lines always appear above any
332 // fill bars/error bars
.
334 Dygraph
.Plotters
.fillPlotter
,
335 Dygraph
.Plotters
.errorPlotter
,
336 Dygraph
.Plotters
.linePlotter
345 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
346 valueFormatter
: Dygraph
.dateString_
,
347 ticker
: null // will be set in dygraph-tickers.js
351 valueFormatter
: Dygraph
.numberValueFormatter
,
352 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
353 ticker
: null // will be set in dygraph-tickers.js
357 valueFormatter
: Dygraph
.numberValueFormatter
,
358 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
359 ticker
: null // will be set in dygraph-tickers.js
364 // Directions for panning and zooming. Use bit operations when combined
365 // values are possible.
366 Dygraph
.HORIZONTAL
= 1;
367 Dygraph
.VERTICAL
= 2;
369 // Installed plugins, in order of precedence (most-general to most-specific).
370 // Plugins are installed after they are defined, in plugins/install.js
.
374 // Used for initializing annotation CSS rules only once.
375 Dygraph
.addedAnnotationCSS
= false;
377 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
378 // Labels is no longer a constructor parameter, since it's typically set
379 // directly from the data source. It also conains a name for the x-axis,
380 // which the previous constructor form did not.
381 if (labels
!== null) {
382 var new_labels
= ["Date"];
383 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
384 Dygraph
.update(attrs
, { 'labels': new_labels
});
386 this.__init__(div
, file
, attrs
);
390 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
391 * and context <canvas> inside of it. See the constructor for details.
393 * @param {Element} div the Element to render the graph into.
394 * @param {String | Function} file Source data
395 * @param {Object} attrs Miscellaneous other options
398 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
399 // Hack for IE: if we're using excanvas and the document hasn't finished
400 // loading yet (and hence may not have initialized whatever it needs to
401 // initialize), then keep calling this routine periodically until it has.
402 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
403 typeof(G_vmlCanvasManager
) != 'undefined' &&
404 document
.readyState
!= 'complete') {
406 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
410 // Support two-argument constructor
411 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
413 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
415 if (typeof(div
) == 'string') {
416 div
= document
.getElementById(div
);
420 Dygraph
.error("Constructing dygraph with a non-existent div!");
424 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
426 // Copy the important bits into the object
427 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
430 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
431 this.previousVerticalX_
= -1;
432 this.fractions_
= attrs
.fractions
|| false;
433 this.dateWindow_
= attrs
.dateWindow
|| null;
435 this.is_initial_draw_
= true;
436 this.annotations_
= [];
438 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
439 this.zoomed_x_
= false;
440 this.zoomed_y_
= false;
442 // Clear the div. This ensure that, if multiple dygraphs are passed the same
443 // div, then only one will be drawn.
446 // For historical reasons, the 'width' and 'height' options trump all CSS
447 // rules _except_ for an explicit 'width' or 'height' on the div.
448 // As an added convenience, if the div has zero height (like <div></div> does
449 // without any styles), then we use a default height/width
.
450 if (div
.style
.width
=== '' && attrs
.width
) {
451 div
.style
.width
= attrs
.width
+ "px";
453 if (div
.style
.height
=== '' && attrs
.height
) {
454 div
.style
.height
= attrs
.height
+ "px";
456 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
457 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
458 if (div
.style
.width
=== '') {
459 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
462 // these will be zero if the dygraph's div is hidden.
463 this.width_
= div
.clientWidth
;
464 this.height_
= div
.clientHeight
;
466 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
467 if (attrs
.stackedGraph
) {
468 attrs
.fillGraph
= true;
469 // TODO(nikhilk): Add any other stackedGraph checks here.
472 // DEPRECATION WARNING: All option processing should be moved from
473 // attrs_ and user_attrs_ to options_, which holds all this information.
475 // Dygraphs has many options, some of which interact with one another.
476 // To keep track of everything, we maintain two sets of options:
478 // this.user_attrs_ only options explicitly set by the user.
479 // this.attrs_ defaults, options derived from user_attrs_, data.
481 // Options are then accessed this.attr_('attr'), which first looks at
482 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
483 // defaults without overriding behavior that the user specifically asks for.
484 this.user_attrs_
= {};
485 Dygraph
.update(this.user_attrs_
, attrs
);
487 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
489 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
491 this.boundaryIds_
= [];
492 this.setIndexByName_
= {};
493 this.datasetIndex_
= [];
495 this.registeredEvents_
= [];
496 this.eventListeners_
= {};
498 this.attributes_
= new DygraphOptions(this);
500 // Create the containing DIV and other interactive elements
501 this.createInterface_();
505 var plugins
= Dygraph
.PLUGINS
.concat(this.getOption('plugins'));
506 for (var i
= 0; i
< plugins
.length
; i
++) {
507 var Plugin
= plugins
[i
];
508 var pluginInstance
= new Plugin();
510 plugin
: pluginInstance
,
516 var handlers
= pluginInstance
.activate(this);
517 for (var eventName
in handlers
) {
518 // TODO(danvk): validate eventName.
519 pluginDict
.events
[eventName
] = handlers
[eventName
];
522 this.plugins_
.push(pluginDict
);
525 // At this point, plugins can no longer register event handlers.
526 // Construct a map from event -> ordered list of [callback, plugin].
527 for (var i
= 0; i
< this.plugins_
.length
; i
++) {
528 var plugin_dict
= this.plugins_
[i
];
529 for (var eventName
in plugin_dict
.events
) {
530 if (!plugin_dict
.events
.hasOwnProperty(eventName
)) continue;
531 var callback
= plugin_dict
.events
[eventName
];
533 var pair
= [plugin_dict
.plugin
, callback
];
534 if (!(eventName
in this.eventListeners_
)) {
535 this.eventListeners_
[eventName
] = [pair
];
537 this.eventListeners_
[eventName
].push(pair
);
542 this.createDragInterface_();
548 * Triggers a cascade of events to the various plugins which are interested in them.
549 * Returns true if the "default behavior" should be performed, i.e. if none of
550 * the event listeners called event.preventDefault().
553 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
554 if (!(name
in this.eventListeners_
)) return true;
556 // QUESTION: can we use objects & prototypes to speed this up?
560 defaultPrevented
: false,
561 preventDefault
: function() {
562 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
563 e
.defaultPrevented
= true;
565 propagationStopped
: false,
566 stopPropagation
: function() {
567 e
.propagationStopped
= true;
570 Dygraph
.update(e
, extra_props
);
572 var callback_plugin_pairs
= this.eventListeners_
[name
];
573 if (callback_plugin_pairs
) {
574 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
575 var plugin
= callback_plugin_pairs
[i
][0];
576 var callback
= callback_plugin_pairs
[i
][1];
577 callback
.call(plugin
, e
);
578 if (e
.propagationStopped
) break;
581 return e
.defaultPrevented
;
585 * Returns the zoomed status of the chart for one or both axes.
587 * Axis is an optional parameter. Can be set to 'x' or 'y'.
589 * The zoomed status for an axis is set whenever a user zooms using the mouse
590 * or when the dateWindow or valueRange are updated (unless the
591 * isZoomedIgnoreProgrammaticZoom option is also specified).
593 Dygraph
.prototype.isZoomed
= function(axis
) {
594 if (axis
=== null || axis
=== undefined
) {
595 return this.zoomed_x_
|| this.zoomed_y_
;
597 if (axis
=== 'x') return this.zoomed_x_
;
598 if (axis
=== 'y') return this.zoomed_y_
;
599 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
603 * Returns information about the Dygraph object, including its containing ID.
605 Dygraph
.prototype.toString
= function() {
606 var maindiv
= this.maindiv_
;
607 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
608 return "[Dygraph " + id
+ "]";
613 * Returns the value of an option. This may be set by the user (either in the
614 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
616 * @param { String } name The name of the option, e.g. 'rollPeriod'.
617 * @param { String } [seriesName] The name of the series to which the option
618 * will be applied. If no per-series value of this option is available, then
619 * the global value is returned. This is optional.
620 * @return { ... } The value of the option.
622 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
623 // <REMOVE_FOR_COMBINED>
624 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
625 this.error('Must include options reference JS for testing');
626 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
627 this.error('Dygraphs is using property ' + name
+ ', which has no entry ' +
628 'in the Dygraphs.OPTIONS_REFERENCE listing.');
629 // Only log this error once.
630 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
632 // </REMOVE_FOR_COMBINED
>
633 return seriesName
? this.attributes_
.getForSeries(name
, seriesName
) : this.attributes_
.get(name
);
637 * Returns the current value for an option, as set in the constructor or via
638 * updateOptions. You may pass in an (optional) series name to get per-series
639 * values for the option.
641 * All values returned by this method should be considered immutable. If you
642 * modify them, there is no guarantee that the changes will be honored or that
643 * dygraphs will remain in a consistent state. If you want to modify an option,
644 * use updateOptions() instead.
646 * @param { String } name The name of the option (e.g. 'strokeWidth')
647 * @param { String } [opt_seriesName] Series name to get per-series values.
648 * @return { ... } The value of the option.
650 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
651 return this.attr_(name
, opt_seriesName
);
654 Dygraph
.prototype.getOptionForAxis
= function(name
, axis
) {
655 return this.attributes_
.getForAxis(name
, axis
);
660 * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2')
661 * @return { ... } A function mapping string -> option value
663 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
665 return function(opt
) {
666 var axis_opts
= self
.user_attrs_
.axes
;
667 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
].hasOwnProperty(opt
)) {
668 return axis_opts
[axis
][opt
];
670 // user-specified attributes always trump defaults, even if they're less
672 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
673 return self
.user_attrs_
[opt
];
676 axis_opts
= self
.attrs_
.axes
;
677 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
].hasOwnProperty(opt
)) {
678 return axis_opts
[axis
][opt
];
680 // check old-style axis options
681 // TODO(danvk): add a deprecation warning if either of these match.
682 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
683 return self
.axes_
[0][opt
];
684 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
685 return self
.axes_
[1][opt
];
687 return self
.attr_(opt
);
692 * Returns the current rolling period, as set by the user or an option.
693 * @return {Number} The number of points in the rolling window
695 Dygraph
.prototype.rollPeriod
= function() {
696 return this.rollPeriod_
;
700 * Returns the currently-visible x-range. This can be affected by zooming,
701 * panning or a call to updateOptions.
702 * Returns a two-element array: [left, right].
703 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
705 Dygraph
.prototype.xAxisRange
= function() {
706 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
710 * Returns the lower- and upper-bound x-axis values of the
713 Dygraph
.prototype.xAxisExtremes
= function() {
714 var pad
= this.attr_('xRangePad') / this.plotter_
.area
.w
;
715 if (this.numRows() === 0) {
716 return [0 - pad
, 1 + pad
];
718 var left
= this.rawData_
[0][0];
719 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
721 // Must keep this in sync with dygraph-layout _evaluateLimits()
722 var range
= right
- left
;
724 right
+= range
* pad
;
726 return [left
, right
];
730 * Returns the currently-visible y-range for an axis. This can be affected by
731 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
732 * called with no arguments, returns the range of the first axis.
733 * Returns a two-element array: [bottom, top].
735 Dygraph
.prototype.yAxisRange
= function(idx
) {
736 if (typeof(idx
) == "undefined") idx
= 0;
737 if (idx
< 0 || idx
>= this.axes_
.length
) {
740 var axis
= this.axes_
[idx
];
741 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
745 * Returns the currently-visible y-ranges for each axis. This can be affected by
746 * zooming, panning, calls to updateOptions, etc.
747 * Returns an array of [bottom, top] pairs, one for each y-axis.
749 Dygraph
.prototype.yAxisRanges
= function() {
751 for (var i
= 0; i
< this.axes_
.length
; i
++) {
752 ret
.push(this.yAxisRange(i
));
757 // TODO(danvk): use these functions throughout dygraphs.
759 * Convert from data coordinates to canvas/div X/Y coordinates.
760 * If specified, do this conversion for the coordinate system of a particular
761 * axis. Uses the first axis by default.
762 * Returns a two-element array: [X, Y]
764 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
765 * instead of toDomCoords(null, y, axis).
767 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
768 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
772 * Convert from data x coordinates to canvas/div X coordinate.
773 * If specified, do this conversion for the coordinate system of a particular
775 * Returns a single value or null if x is null.
777 Dygraph
.prototype.toDomXCoord
= function(x
) {
782 var area
= this.plotter_
.area
;
783 var xRange
= this.xAxisRange();
784 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
788 * Convert from data x coordinates to canvas/div Y coordinate and optional
789 * axis. Uses the first axis by default.
791 * returns a single value or null if y is null.
793 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
794 var pct
= this.toPercentYCoord(y
, axis
);
799 var area
= this.plotter_
.area
;
800 return area
.y
+ pct
* area
.h
;
804 * Convert from canvas/div coords to data coordinates.
805 * If specified, do this conversion for the coordinate system of a particular
806 * axis. Uses the first axis by default.
807 * Returns a two-element array: [X, Y].
809 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
810 * instead of toDataCoords(null, y, axis).
812 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
813 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
817 * Convert from canvas/div x coordinate to data coordinate.
819 * If x is null, this returns null.
821 Dygraph
.prototype.toDataXCoord
= function(x
) {
826 var area
= this.plotter_
.area
;
827 var xRange
= this.xAxisRange();
828 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
832 * Convert from canvas/div y coord to value.
834 * If y is null, this returns null.
835 * if axis is null, this uses the first axis.
837 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
842 var area
= this.plotter_
.area
;
843 var yRange
= this.yAxisRange(axis
);
845 if (typeof(axis
) == "undefined") axis
= 0;
846 if (!this.axes_
[axis
].logscale
) {
847 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
849 // Computing the inverse of toDomCoord.
850 var pct
= (y
- area
.y
) / area
.h
;
852 // Computing the inverse of toPercentYCoord. The function was arrived at with
853 // the following steps:
855 // Original calcuation:
856 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
858 // Move denominator to both sides:
859 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
861 // subtract logr1, and take the negative value.
862 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
864 // Swap both sides of the equation, and we can compute the log of the
865 // return value. Which means we just need to use that as the exponent in
867 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
869 var logr1
= Dygraph
.log10(yRange
[1]);
870 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
871 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
877 * Converts a y for an axis to a percentage from the top to the
878 * bottom of the drawing area.
880 * If the coordinate represents a value visible on the canvas, then
881 * the value will be between 0 and 1, where 0 is the top of the canvas.
882 * However, this method will return values outside the range, as
883 * values can fall outside the canvas.
885 * If y is null, this returns null.
886 * if axis is null, this uses the first axis.
888 * @param { Number } y The data y-coordinate.
889 * @param { Number } [axis] The axis number on which the data coordinate lives.
890 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
892 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
896 if (typeof(axis
) == "undefined") axis
= 0;
898 var yRange
= this.yAxisRange(axis
);
901 var logscale
= this.attributes_
.getForAxis("logscale", axis
);
903 // yRange[1] - y is unit distance from the bottom.
904 // yRange[1] - yRange[0] is the scale of the range.
905 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
906 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
908 var logr1
= Dygraph
.log10(yRange
[1]);
909 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
915 * Converts an x value to a percentage from the left to the right of
918 * If the coordinate represents a value visible on the canvas, then
919 * the value will be between 0 and 1, where 0 is the left of the canvas.
920 * However, this method will return values outside the range, as
921 * values can fall outside the canvas.
923 * If x is null, this returns null.
924 * @param { Number } x The data x-coordinate.
925 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
927 Dygraph
.prototype.toPercentXCoord
= function(x
) {
932 var xRange
= this.xAxisRange();
933 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
937 * Returns the number of columns (including the independent variable).
938 * @return { Integer } The number of columns.
940 Dygraph
.prototype.numColumns
= function() {
941 if (!this.rawData_
) return 0;
942 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
946 * Returns the number of rows (excluding any header/label row).
947 * @return { Integer } The number of rows, less any header.
949 Dygraph
.prototype.numRows
= function() {
950 if (!this.rawData_
) return 0;
951 return this.rawData_
.length
;
955 * Returns the value in the given row and column. If the row and column exceed
956 * the bounds on the data, returns null. Also returns null if the value is
958 * @param { Number} row The row number of the data (0-based). Row 0 is the
959 * first row of data, not a header row.
960 * @param { Number} col The column number of the data (0-based)
961 * @return { Number } The value in the specified cell or null if the row/col
964 Dygraph
.prototype.getValue
= function(row
, col
) {
965 if (row
< 0 || row
> this.rawData_
.length
) return null;
966 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
968 return this.rawData_
[row
][col
];
972 * Generates interface elements for the Dygraph: a containing div, a div to
973 * display the current point, and a textbox to adjust the rolling average
974 * period. Also creates the Renderer/Layout elements.
977 Dygraph
.prototype.createInterface_
= function() {
978 // Create the all-enclosing graph div
979 var enclosing
= this.maindiv_
;
981 this.graphDiv
= document
.createElement("div");
982 this.graphDiv
.style
.width
= this.width_
+ "px";
983 this.graphDiv
.style
.height
= this.height_
+ "px";
984 // TODO(danvk): any other styles that are useful to set here?
985 this.graphDiv
.style
.textAlign
= 'left'; // This is a CSS "reset"
986 enclosing
.appendChild(this.graphDiv
);
988 // Create the canvas for interactive parts of the chart.
989 this.canvas_
= Dygraph
.createCanvas();
990 this.canvas_
.style
.position
= "absolute";
991 this.canvas_
.width
= this.width_
;
992 this.canvas_
.height
= this.height_
;
993 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
994 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
996 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
998 // ... and for static parts of the chart.
999 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
1000 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
1002 // The interactive parts of the graph are drawn on top of the chart.
1003 this.graphDiv
.appendChild(this.hidden_
);
1004 this.graphDiv
.appendChild(this.canvas_
);
1005 this.mouseEventElement_
= this.createMouseEventElement_();
1007 // Create the grapher
1008 this.layout_
= new DygraphLayout(this);
1012 this.mouseMoveHandler_
= function(e
) {
1013 dygraph
.mouseMove_(e
);
1016 this.mouseOutHandler_
= function(e
) {
1017 // The mouse has left the chart if:
1018 // 1. e.target is inside the chart
1019 // 2. e.relatedTarget is outside the chart
1020 var target
= e
.target
|| e
.fromElement
;
1021 var relatedTarget
= e
.relatedTarget
|| e
.toElement
;
1022 if (Dygraph
.isElementContainedBy(target
, dygraph
.graphDiv
) &&
1023 !Dygraph
.isElementContainedBy(relatedTarget
, dygraph
.graphDiv
)) {
1024 dygraph
.mouseOut_(e
);
1028 this.addEvent(window
, 'mouseout', this.mouseOutHandler_
);
1029 this.addEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler_
);
1031 // Don't recreate and register the resize handler on subsequent calls.
1032 // This happens when the graph is resized.
1033 if (!this.resizeHandler_
) {
1034 this.resizeHandler_
= function(e
) {
1038 // Update when the window is resized.
1039 // TODO(danvk): drop frames depending on complexity of the chart.
1040 this.addEvent(window
, 'resize', this.resizeHandler_
);
1045 * Detach DOM elements in the dygraph and null out all data references.
1046 * Calling this when you're done with a dygraph can dramatically reduce memory
1047 * usage. See, e.g., the tests/perf.html example.
1049 Dygraph
.prototype.destroy
= function() {
1050 var removeRecursive
= function(node
) {
1051 while (node
.hasChildNodes()) {
1052 removeRecursive(node
.firstChild
);
1053 node
.removeChild(node
.firstChild
);
1057 if (this.registeredEvents_
) {
1058 for (var idx
= 0; idx
< this.registeredEvents_
.length
; idx
++) {
1059 var reg
= this.registeredEvents_
[idx
];
1060 Dygraph
.removeEvent(reg
.elem
, reg
.type
, reg
.fn
);
1064 this.registeredEvents_
= [];
1066 // remove mouse event handlers (This may not be necessary anymore)
1067 Dygraph
.removeEvent(window
, 'mouseout', this.mouseOutHandler_
);
1068 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler_
);
1069 Dygraph
.removeEvent(this.mouseEventElement_
, 'mouseup', this.mouseUpHandler_
);
1071 // remove window handlers
1072 Dygraph
.removeEvent(window
,'resize',this.resizeHandler_
);
1073 this.resizeHandler_
= null;
1075 removeRecursive(this.maindiv_
);
1077 var nullOut
= function(obj
) {
1078 for (var n
in obj
) {
1079 if (typeof(obj
[n
]) === 'object') {
1084 // These may not all be necessary, but it can't hurt...
1085 nullOut(this.layout_
);
1086 nullOut(this.plotter_
);
1091 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1092 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1093 * or the zoom rectangles) is done on this.canvas_.
1094 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1095 * @return {Object} The newly-created canvas
1098 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1099 var h
= Dygraph
.createCanvas();
1100 h
.style
.position
= "absolute";
1101 // TODO(danvk): h should be offset from canvas. canvas needs to include
1102 // some extra area to make it easier to zoom in on the far left and far
1103 // right. h needs to be precisely the plot area, so that clipping occurs.
1104 h
.style
.top
= canvas
.style
.top
;
1105 h
.style
.left
= canvas
.style
.left
;
1106 h
.width
= this.width_
;
1107 h
.height
= this.height_
;
1108 h
.style
.width
= this.width_
+ "px"; // for IE
1109 h
.style
.height
= this.height_
+ "px"; // for IE
1114 * Creates an overlay element used to handle mouse events.
1115 * @return {Object} The mouse event element.
1118 Dygraph
.prototype.createMouseEventElement_
= function() {
1119 if (this.isUsingExcanvas_
) {
1120 var elem
= document
.createElement("div");
1121 elem
.style
.position
= 'absolute';
1122 elem
.style
.backgroundColor
= 'white';
1123 elem
.style
.filter
= 'alpha(opacity=0)';
1124 elem
.style
.width
= this.width_
+ "px";
1125 elem
.style
.height
= this.height_
+ "px";
1126 this.graphDiv
.appendChild(elem
);
1129 return this.canvas_
;
1134 * Generate a set of distinct colors for the data series. This is done with a
1135 * color wheel. Saturation/Value are customizable, and the hue is
1136 * equally-spaced around the color wheel. If a custom set of colors is
1137 * specified, that is used instead.
1140 Dygraph
.prototype.setColors_
= function() {
1141 var labels
= this.getLabels();
1142 var num
= labels
.length
- 1;
1144 this.colorsMap_
= {};
1145 var colors
= this.attr_('colors');
1148 var sat
= this.attr_('colorSaturation') || 1.0;
1149 var val
= this.attr_('colorValue') || 0.5;
1150 var half
= Math
.ceil(num
/ 2);
1151 for (i
= 1; i
<= num
; i
++) {
1152 if (!this.visibility()[i
-1]) continue;
1153 // alternate colors for high contrast.
1154 var idx
= i
% 2 ? Math
.ceil(i
/ 2) : (half + i / 2);
1155 var hue
= (1.0 * idx
/ (1 + num
));
1156 var colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1157 this.colors_
.push(colorStr
);
1158 this.colorsMap_
[labels
[i
]] = colorStr
;
1161 for (i
= 0; i
< num
; i
++) {
1162 if (!this.visibility()[i
]) continue;
1163 var colorStr
= colors
[i
% colors
.length
];
1164 this.colors_
.push(colorStr
);
1165 this.colorsMap_
[labels
[1 + i
]] = colorStr
;
1171 * Return the list of colors. This is either the list of colors passed in the
1172 * attributes or the autogenerated list of rgb(r,g,b) strings.
1173 * This does not return colors for invisible series.
1174 * @return {Array<string>} The list of colors.
1176 Dygraph
.prototype.getColors
= function() {
1177 return this.colors_
;
1181 * Returns a few attributes of a series, i.e. its color, its visibility, which
1182 * axis it's assigned to, and its column in the original data.
1183 * Returns null if the series does not exist.
1184 * Otherwise, returns an object with column, visibility, color and axis properties.
1185 * The "axis" property will be set to 1 for y1 and 2 for y2.
1186 * The "column" property can be fed back into getValue(row, column) to get
1187 * values for this series.
1189 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1191 var labels
= this.getLabels();
1192 for (var i
= 1; i
< labels
.length
; i
++) {
1193 if (labels
[i
] == series_name
) {
1198 if (idx
== -1) return null;
1203 visible
: this.visibility()[idx
- 1],
1204 color
: this.colorsMap_
[series_name
],
1205 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1210 * Create the text box to adjust the averaging period
1213 Dygraph
.prototype.createRollInterface_
= function() {
1214 // Create a roller if one doesn't exist already.
1215 if (!this.roller_
) {
1216 this.roller_
= document
.createElement("input");
1217 this.roller_
.type
= "text";
1218 this.roller_
.style
.display
= "none";
1219 this.graphDiv
.appendChild(this.roller_
);
1222 var display
= this.attr_('showRoller') ? 'block' : 'none';
1224 var area
= this.plotter_
.area
;
1225 var textAttr
= { "position": "absolute",
1227 "top": (area
.y
+ area
.h
- 25) + "px",
1228 "left": (area
.x
+ 1) + "px",
1231 this.roller_
.size
= "2";
1232 this.roller_
.value
= this.rollPeriod_
;
1233 for (var name
in textAttr
) {
1234 if (textAttr
.hasOwnProperty(name
)) {
1235 this.roller_
.style
[name
] = textAttr
[name
];
1240 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1245 * Converts page the x-coordinate of the event to pixel x-coordinates on the
1246 * canvas (i.e. DOM Coords).
1248 Dygraph
.prototype.dragGetX_
= function(e
, context
) {
1249 return Dygraph
.pageX(e
) - context
.px
;
1254 * Converts page the y-coordinate of the event to pixel y-coordinates on the
1255 * canvas (i.e. DOM Coords).
1257 Dygraph
.prototype.dragGetY_
= function(e
, context
) {
1258 return Dygraph
.pageY(e
) - context
.py
;
1262 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1266 Dygraph
.prototype.createDragInterface_
= function() {
1268 // Tracks whether the mouse is down right now
1270 isPanning
: false, // is this drag part of a pan?
1271 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1272 dragStartX
: null, // pixel coordinates
1273 dragStartY
: null, // pixel coordinates
1274 dragEndX
: null, // pixel coordinates
1275 dragEndY
: null, // pixel coordinates
1276 dragDirection
: null,
1277 prevEndX
: null, // pixel coordinates
1278 prevEndY
: null, // pixel coordinates
1279 prevDragDirection
: null,
1280 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1282 // The value on the left side of the graph when a pan operation starts.
1283 initialLeftmostDate
: null,
1285 // The number of units each pixel spans. (This won't be valid for log
1287 xUnitsPerPixel
: null,
1289 // TODO(danvk): update this comment
1290 // The range in second/value units that the viewport encompasses during a
1291 // panning operation.
1294 // Top-left corner of the canvas, in DOM coords
1295 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1299 // Values for use with panEdgeFraction, which limit how far outside the
1300 // graph's data boundaries it can be panned.
1301 boundedDates
: null, // [minDate, maxDate]
1302 boundedValues
: null, // [[minValue, maxValue] ...]
1304 // We cover iframes during mouse interactions. See comments in
1305 // dygraph-utils.js for more info on why this is a good idea.
1306 tarp
: new Dygraph
.IFrameTarp(),
1308 // contextB is the same thing as this context object but renamed.
1309 initializeMouseDown
: function(event
, g
, contextB
) {
1310 // prevents mouse drags from selecting page text.
1311 if (event
.preventDefault
) {
1312 event
.preventDefault(); // Firefox, Chrome, etc.
1314 event
.returnValue
= false; // IE
1315 event
.cancelBubble
= true;
1318 contextB
.px
= Dygraph
.findPosX(g
.canvas_
);
1319 contextB
.py
= Dygraph
.findPosY(g
.canvas_
);
1320 contextB
.dragStartX
= g
.dragGetX_(event
, contextB
);
1321 contextB
.dragStartY
= g
.dragGetY_(event
, contextB
);
1322 contextB
.cancelNextDblclick
= false;
1323 contextB
.tarp
.cover();
1327 var interactionModel
= this.attr_("interactionModel");
1329 // Self is the graph.
1332 // Function that binds the graph and context to the handler.
1333 var bindHandler
= function(handler
) {
1334 return function(event
) {
1335 handler(event
, self
, context
);
1339 for (var eventName
in interactionModel
) {
1340 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1341 this.addEvent(this.mouseEventElement_
, eventName
,
1342 bindHandler(interactionModel
[eventName
]));
1345 // unregister the handler on subsequent calls.
1346 // This happens when the graph is resized.
1347 if (this.mouseUpHandler_
) {
1348 Dygraph
.removeEvent(document
, 'mouseup', this.mouseUpHandler_
);
1351 // If the user releases the mouse button during a drag, but not over the
1352 // canvas, then it doesn't count as a zooming action.
1353 this.mouseUpHandler_
= function(event
) {
1354 if (context
.isZooming
|| context
.isPanning
) {
1355 context
.isZooming
= false;
1356 context
.dragStartX
= null;
1357 context
.dragStartY
= null;
1360 if (context
.isPanning
) {
1361 context
.isPanning
= false;
1362 context
.draggingDate
= null;
1363 context
.dateRange
= null;
1364 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1365 delete self
.axes_
[i
].draggingValue
;
1366 delete self
.axes_
[i
].dragValueRange
;
1370 context
.tarp
.uncover();
1373 this.addEvent(document
, 'mouseup', this.mouseUpHandler_
);
1377 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1378 * up any previous zoom rectangles that were drawn. This could be optimized to
1379 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1382 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1383 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1384 * @param {Number} startX The X position where the drag started, in canvas
1386 * @param {Number} endX The current X position of the drag, in canvas coords.
1387 * @param {Number} startY The Y position where the drag started, in canvas
1389 * @param {Number} endY The current Y position of the drag, in canvas coords.
1390 * @param {Number} prevDirection the value of direction on the previous call to
1391 * this function. Used to avoid excess redrawing
1392 * @param {Number} prevEndX The value of endX on the previous call to this
1393 * function. Used to avoid excess redrawing
1394 * @param {Number} prevEndY The value of endY on the previous call to this
1395 * function. Used to avoid excess redrawing
1398 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1399 endY
, prevDirection
, prevEndX
,
1401 var ctx
= this.canvas_ctx_
;
1403 // Clean up from the previous rect if necessary
1404 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1405 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1406 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1407 } else if (prevDirection
== Dygraph
.VERTICAL
){
1408 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1409 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1412 // Draw a light-grey rectangle to show the new viewing area
1413 if (direction
== Dygraph
.HORIZONTAL
) {
1414 if (endX
&& startX
) {
1415 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1416 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1417 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1419 } else if (direction
== Dygraph
.VERTICAL
) {
1420 if (endY
&& startY
) {
1421 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1422 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1423 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1427 if (this.isUsingExcanvas_
) {
1428 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1433 * Clear the zoom rectangle (and perform no zoom).
1436 Dygraph
.prototype.clearZoomRect_
= function() {
1437 this.currentZoomRectArgs_
= null;
1438 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1442 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1443 * the canvas. The exact zoom window may be slightly larger if there are no data
1444 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1445 * which accepts dates that match the raw data. This function redraws the graph.
1447 * @param {Number} lowX The leftmost pixel value that should be visible.
1448 * @param {Number} highX The rightmost pixel value that should be visible.
1451 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1452 this.currentZoomRectArgs_
= null;
1453 // Find the earliest and latest dates contained in this canvasx range.
1454 // Convert the call to date ranges of the raw data.
1455 var minDate
= this.toDataXCoord(lowX
);
1456 var maxDate
= this.toDataXCoord(highX
);
1457 this.doZoomXDates_(minDate
, maxDate
);
1461 * Transition function to use in animations. Returns values between 0.0
1462 * (totally old values) and 1.0 (totally new values) for each frame.
1465 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1467 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1471 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1472 * method with doZoomX which accepts pixel coordinates. This function redraws
1475 * @param {Number} minDate The minimum date that should be visible.
1476 * @param {Number} maxDate The maximum date that should be visible.
1479 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1480 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1481 // can produce strange effects. Rather than the y-axis transitioning slowly
1482 // between values, it can jerk around.)
1483 var old_window
= this.xAxisRange();
1484 var new_window
= [minDate
, maxDate
];
1485 this.zoomed_x_
= true;
1487 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1488 if (that
.attr_("zoomCallback")) {
1489 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1495 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1496 * the canvas. This function redraws the graph.
1498 * @param {Number} lowY The topmost pixel value that should be visible.
1499 * @param {Number} highY The lowest pixel value that should be visible.
1502 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1503 this.currentZoomRectArgs_
= null;
1504 // Find the highest and lowest values in pixel range for each axis.
1505 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1506 // This is because pixels increase as you go down on the screen, whereas data
1507 // coordinates increase as you go up the screen.
1508 var oldValueRanges
= this.yAxisRanges();
1509 var newValueRanges
= [];
1510 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1511 var hi
= this.toDataYCoord(lowY
, i
);
1512 var low
= this.toDataYCoord(highY
, i
);
1513 newValueRanges
.push([low
, hi
]);
1516 this.zoomed_y_
= true;
1518 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1519 if (that
.attr_("zoomCallback")) {
1520 var xRange
= that
.xAxisRange();
1521 that
.attr_("zoomCallback")(xRange
[0], xRange
[1], that
.yAxisRanges());
1527 * Reset the zoom to the original view coordinates. This is the same as
1528 * double-clicking on the graph.
1530 Dygraph
.prototype.resetZoom
= function() {
1531 var dirty
= false, dirtyX
= false, dirtyY
= false;
1532 if (this.dateWindow_
!== null) {
1537 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1538 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1544 // Clear any selection, since it's likely to be drawn in the wrong place.
1545 this.clearSelection();
1548 this.zoomed_x_
= false;
1549 this.zoomed_y_
= false;
1551 var minDate
= this.rawData_
[0][0];
1552 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1554 // With only one frame, don't bother calculating extreme ranges.
1555 // TODO(danvk): merge this block w/ the code below
.
1556 if (!this.attr_("animatedZooms")) {
1557 this.dateWindow_
= null;
1558 for (i
= 0; i
< this.axes_
.length
; i
++) {
1559 if (this.axes_
[i
].valueWindow
!== null) {
1560 delete this.axes_
[i
].valueWindow
;
1564 if (this.attr_("zoomCallback")) {
1565 this.attr_("zoomCallback")(minDate
, maxDate
, this.yAxisRanges());
1570 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1572 oldWindow
= this.xAxisRange();
1573 newWindow
= [minDate
, maxDate
];
1577 oldValueRanges
= this.yAxisRanges();
1578 // TODO(danvk): this is pretty inefficient
1579 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1580 var extremes
= packed
[1];
1582 // this has the side-effect of modifying this.axes_.
1583 // this doesn't make much sense in this context, but it's convenient (we
1584 // need this.axes_[*].extremeValues) and not harmful since we'll be
1585 // calling drawGraph_ shortly, which clobbers these values.
1586 this.computeYAxisRanges_(extremes
);
1588 newValueRanges
= [];
1589 for (i
= 0; i
< this.axes_
.length
; i
++) {
1590 var axis
= this.axes_
[i
];
1591 newValueRanges
.push((axis
.valueRange
!== null &&
1592 axis
.valueRange
!== undefined
) ?
1593 axis
.valueRange
: axis
.extremeRange
);
1598 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1600 that
.dateWindow_
= null;
1601 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1602 if (that
.axes_
[i
].valueWindow
!== null) {
1603 delete that
.axes_
[i
].valueWindow
;
1606 if (that
.attr_("zoomCallback")) {
1607 that
.attr_("zoomCallback")(minDate
, maxDate
, that
.yAxisRanges());
1614 * Combined animation logic for all zoom functions.
1615 * either the x parameters or y parameters may be null.
1618 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1619 var steps
= this.attr_("animatedZooms") ? Dygraph
.ANIMATION_STEPS
: 1;
1622 var valueRanges
= [];
1625 if (oldXRange
!== null && newXRange
!== null) {
1626 for (step
= 1; step
<= steps
; step
++) {
1627 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1628 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1629 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1633 if (oldYRanges
!== null && newYRanges
!== null) {
1634 for (step
= 1; step
<= steps
; step
++) {
1635 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1637 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1638 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1639 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1641 valueRanges
[step
-1] = thisRange
;
1646 Dygraph
.repeatAndCleanup(function(step
) {
1647 if (valueRanges
.length
) {
1648 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1649 var w
= valueRanges
[step
][i
];
1650 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1653 if (windows
.length
) {
1654 that
.dateWindow_
= windows
[step
];
1657 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1661 * Get the current graph's area object.
1663 * Returns: {x, y, w, h}
1665 Dygraph
.prototype.getArea
= function() {
1666 return this.plotter_
.area
;
1670 * Convert a mouse event to DOM coordinates relative to the graph origin.
1672 * Returns a two-element array: [X, Y].
1674 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1675 if (event
.offsetX
&& event
.offsetY
) {
1676 return [ event
.offsetX
, event
.offsetY
];
1678 var canvasx
= Dygraph
.pageX(event
) - Dygraph
.findPosX(this.mouseEventElement_
);
1679 var canvasy
= Dygraph
.pageY(event
) - Dygraph
.findPosY(this.mouseEventElement_
);
1680 return [canvasx
, canvasy
];
1685 * Given a canvas X coordinate, find the closest row.
1686 * @param {Number} domX graph-relative DOM X coordinate
1687 * Returns: row number, integer
1690 Dygraph
.prototype.findClosestRow
= function(domX
) {
1691 var minDistX
= Infinity
;
1692 var pointIdx
= -1, setIdx
= -1;
1693 var sets
= this.layout_
.points
;
1694 for (var i
= 0; i
< sets
.length
; i
++) {
1695 var points
= sets
[i
];
1696 var len
= points
.length
;
1697 for (var j
= 0; j
< len
; j
++) {
1698 var point
= points
[j
];
1699 if (!Dygraph
.isValidPoint(point
, true)) continue;
1700 var dist
= Math
.abs(point
.canvasx
- domX
);
1701 if (dist
< minDistX
) {
1709 // TODO(danvk): remove this function; it's trivial and has only one use.
1710 return this.idxToRow_(setIdx
, pointIdx
);
1714 * Given canvas X,Y coordinates, find the closest point.
1716 * This finds the individual data point across all visible series
1717 * that's closest to the supplied DOM coordinates using the standard
1718 * Euclidean X,Y distance.
1720 * @param {Number} domX graph-relative DOM X coordinate
1721 * @param {Number} domY graph-relative DOM Y coordinate
1722 * Returns: {row, seriesName, point}
1725 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1726 var minDist
= Infinity
;
1728 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
;
1729 for ( var setIdx
= this.layout_
.datasets
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1730 var points
= this.layout_
.points
[setIdx
];
1731 for (var i
= 0; i
< points
.length
; ++i
) {
1732 var point
= points
[i
];
1733 if (!Dygraph
.isValidPoint(point
)) continue;
1734 dx
= point
.canvasx
- domX
;
1735 dy
= point
.canvasy
- domY
;
1736 dist
= dx
* dx
+ dy
* dy
;
1737 if (dist
< minDist
) {
1739 closestPoint
= point
;
1740 closestSeries
= setIdx
;
1745 var name
= this.layout_
.setNames
[closestSeries
];
1747 row
: idx
+ this.getLeftBoundary_(),
1754 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1756 * This first finds the X data point closest to the supplied DOM X coordinate,
1757 * then finds the series which puts the Y coordinate on top of its filled area,
1758 * using linear interpolation between adjacent point pairs.
1760 * @param {Number} domX graph-relative DOM X coordinate
1761 * @param {Number} domY graph-relative DOM Y coordinate
1762 * Returns: {row, seriesName, point}
1765 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1766 var row
= this.findClosestRow(domX
);
1767 var boundary
= this.getLeftBoundary_();
1768 var rowIdx
= row
- boundary
;
1769 var closestPoint
, closestSeries
;
1770 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
1771 var points
= this.layout_
.points
[setIdx
];
1772 if (rowIdx
>= points
.length
) continue;
1773 var p1
= points
[rowIdx
];
1774 if (!Dygraph
.isValidPoint(p1
)) continue;
1775 var py
= p1
.canvasy
;
1776 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1777 // interpolate series Y value using next point
1778 var p2
= points
[rowIdx
+ 1];
1779 if (Dygraph
.isValidPoint(p2
)) {
1780 var dx
= p2
.canvasx
- p1
.canvasx
;
1782 var r
= (domX
- p1
.canvasx
) / dx
;
1783 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1786 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1787 // interpolate series Y value using previous point
1788 var p0
= points
[rowIdx
- 1];
1789 if (Dygraph
.isValidPoint(p0
)) {
1790 var dx
= p1
.canvasx
- p0
.canvasx
;
1792 var r
= (p1
.canvasx
- domX
) / dx
;
1793 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1797 // Stop if the point (domX, py) is above this series' upper edge
1798 if (setIdx
=== 0 || py
< domY
) {
1800 closestSeries
= setIdx
;
1803 var name
= this.layout_
.setNames
[closestSeries
];
1812 * When the mouse moves in the canvas, display information about a nearby data
1813 * point and draw dots over those points in the data series. This function
1814 * takes care of cleanup of previously-drawn dots.
1815 * @param {Object} event The mousemove event from the browser.
1818 Dygraph
.prototype.mouseMove_
= function(event
) {
1819 // This prevents JS errors when mousing over the canvas before data loads.
1820 var points
= this.layout_
.points
;
1821 if (points
=== undefined
|| points
=== null) return;
1823 var canvasCoords
= this.eventToDomCoords(event
);
1824 var canvasx
= canvasCoords
[0];
1825 var canvasy
= canvasCoords
[1];
1827 var highlightSeriesOpts
= this.attr_("highlightSeriesOpts");
1828 var selectionChanged
= false;
1829 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1831 if (this.attr_("stackedGraph")) {
1832 closest
= this.findStackedPoint(canvasx
, canvasy
);
1834 closest
= this.findClosestPoint(canvasx
, canvasy
);
1836 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1838 var idx
= this.findClosestRow(canvasx
);
1839 selectionChanged
= this.setSelection(idx
);
1842 var callback
= this.attr_("highlightCallback");
1843 if (callback
&& selectionChanged
) {
1847 this.lastRow_
+ this.getLeftBoundary_(),
1848 this.highlightSet_
);
1853 * Fetch left offset from first defined boundaryIds record (see bug #236).
1856 Dygraph
.prototype.getLeftBoundary_
= function() {
1857 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1858 if (this.boundaryIds_
[i
] !== undefined
) {
1859 return this.boundaryIds_
[i
][0];
1866 * Transforms layout_.points index into data row number.
1867 * @param int layout_.points index
1868 * @return int row number, or -1 if none could be found.
1871 Dygraph
.prototype.idxToRow_
= function(setIdx
, rowIdx
) {
1872 if (rowIdx
< 0) return -1;
1874 var boundary
= this.getLeftBoundary_();
1875 return boundary
+ rowIdx
;
1876 // for (var setIdx = 0; setIdx < this.layout_.datasets.length; ++setIdx) {
1877 // var set = this.layout_.datasets[setIdx];
1878 // if (idx < set.length) {
1879 // return boundary + idx;
1881 // idx -= set.length;
1886 Dygraph
.prototype.animateSelection_
= function(direction
) {
1887 var totalSteps
= 10;
1889 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1890 if (this.animateId
=== undefined
) this.animateId
= 0;
1891 var start
= this.fadeLevel
;
1892 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1894 if (this.fadeLevel
) {
1895 this.updateSelection_(1.0);
1900 var thisId
= ++this.animateId
;
1902 Dygraph
.repeatAndCleanup(
1904 // ignore simultaneous animations
1905 if (that
.animateId
!= thisId
) return;
1907 that
.fadeLevel
+= direction
;
1908 if (that
.fadeLevel
=== 0) {
1909 that
.clearSelection();
1911 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1914 steps
, millis
, function() {});
1918 * Draw dots over the selectied points in the data series. This function
1919 * takes care of cleanup of previously-drawn dots.
1922 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1923 /*var defaultPrevented = */
1924 this.cascadeEvents_('select', {
1925 selectedX
: this.lastx_
,
1926 selectedPoints
: this.selPoints_
1928 // TODO(danvk): use defaultPrevented here?
1930 // Clear the previously drawn vertical, if there is one
1932 var ctx
= this.canvas_ctx_
;
1933 if (this.attr_('highlightSeriesOpts')) {
1934 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1935 var alpha
= 1.0 - this.attr_('highlightSeriesBackgroundAlpha');
1937 // Activating background fade includes an animation effect for a gradual
1938 // fade. TODO(klausw): make this independently configurable if it causes
1939 // issues? Use a shared preference to control animations?
1940 var animateBackgroundFade
= true;
1941 if (animateBackgroundFade
) {
1942 if (opt_animFraction
=== undefined
) {
1943 // start a new animation
1944 this.animateSelection_(1);
1947 alpha
*= opt_animFraction
;
1949 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1950 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1953 // Redraw only the highlighted series in the interactive canvas (not the
1954 // static plot canvas, which is where series are usually drawn).
1955 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1956 } else if (this.previousVerticalX_
>= 0) {
1957 // Determine the maximum highlight circle size.
1958 var maxCircleSize
= 0;
1959 var labels
= this.attr_('labels');
1960 for (i
= 1; i
< labels
.length
; i
++) {
1961 var r
= this.attr_('highlightCircleSize', labels
[i
]);
1962 if (r
> maxCircleSize
) maxCircleSize
= r
;
1964 var px
= this.previousVerticalX_
;
1965 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1966 2 * maxCircleSize
+ 2, this.height_
);
1969 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1970 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1973 if (this.selPoints_
.length
> 0) {
1974 // Draw colored circles over the center of each selected point
1975 var canvasx
= this.selPoints_
[0].canvasx
;
1977 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
1978 var pt
= this.selPoints_
[i
];
1979 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
1981 var circleSize
= this.attr_('highlightCircleSize', pt
.name
);
1982 var callback
= this.attr_("drawHighlightPointCallback", pt
.name
);
1983 var color
= this.plotter_
.colors
[pt
.name
];
1985 callback
= Dygraph
.Circles
.DEFAULT
;
1987 ctx
.lineWidth
= this.attr_('strokeWidth', pt
.name
);
1988 ctx
.strokeStyle
= color
;
1989 ctx
.fillStyle
= color
;
1990 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
1991 color
, circleSize
, pt
.idx
);
1995 this.previousVerticalX_
= canvasx
;
2000 * Manually set the selected points and display information about them in the
2001 * legend. The selection can be cleared using clearSelection() and queried
2002 * using getSelection().
2003 * @param { Integer } row number that should be highlighted (i.e. appear with
2004 * hover dots on the chart). Set to false to clear any selection.
2005 * @param { seriesName } optional series name to highlight that series with the
2006 * the highlightSeriesOpts setting.
2007 * @param { locked } optional If true, keep seriesName selected when mousing
2008 * over the graph, disabling closest-series highlighting. Call clearSelection()
2011 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
2012 // Extract the points we've selected
2013 this.selPoints_
= [];
2015 if (row
!== false) {
2016 row
-= this.getLeftBoundary_();
2019 var changed
= false;
2020 if (row
!== false && row
>= 0) {
2021 if (row
!= this.lastRow_
) changed
= true;
2022 this.lastRow_
= row
;
2023 for (var setIdx
= 0; setIdx
< this.layout_
.datasets
.length
; ++setIdx
) {
2024 var set
= this.layout_
.datasets
[setIdx
];
2025 if (row
< set
.length
) {
2026 var point
= this.layout_
.points
[setIdx
][row
];
2028 if (this.attr_("stackedGraph")) {
2029 point
= this.layout_
.unstackPointAtIndex(setIdx
, row
);
2032 if (point
.yval
!== null) this.selPoints_
.push(point
);
2036 if (this.lastRow_
>= 0) changed
= true;
2040 if (this.selPoints_
.length
) {
2041 this.lastx_
= this.selPoints_
[0].xval
;
2046 if (opt_seriesName
!== undefined
) {
2047 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
2048 this.highlightSet_
= opt_seriesName
;
2051 if (opt_locked
!== undefined
) {
2052 this.lockedSet_
= opt_locked
;
2056 this.updateSelection_(undefined
);
2062 * The mouse has left the canvas. Clear out whatever artifacts remain
2063 * @param {Object} event the mouseout event from the browser.
2066 Dygraph
.prototype.mouseOut_
= function(event
) {
2067 if (this.attr_("unhighlightCallback")) {
2068 this.attr_("unhighlightCallback")(event
);
2071 if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_
) {
2072 this.clearSelection();
2077 * Clears the current selection (i.e. points that were highlighted by moving
2078 * the mouse over the chart).
2080 Dygraph
.prototype.clearSelection
= function() {
2081 this.cascadeEvents_('deselect', {});
2083 this.lockedSet_
= false;
2084 // Get rid of the overlay data
2085 if (this.fadeLevel
) {
2086 this.animateSelection_(-1);
2089 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2091 this.selPoints_
= [];
2094 this.highlightSet_
= null;
2098 * Returns the number of the currently selected row. To get data for this row,
2099 * you can use the getValue method.
2100 * @return { Integer } row number, or -1 if nothing is selected
2102 Dygraph
.prototype.getSelection
= function() {
2103 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2107 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2108 var points
= this.layout_
.points
[setIdx
];
2109 for (var row
= 0; row
< points
.length
; row
++) {
2110 if (points
[row
].x
== this.selPoints_
[0].x
) {
2111 return row
+ this.getLeftBoundary_();
2119 * Returns the name of the currently-highlighted series.
2120 * Only available when the highlightSeriesOpts option is in use.
2122 Dygraph
.prototype.getHighlightSeries
= function() {
2123 return this.highlightSet_
;
2127 * Returns true if the currently-highlighted series was locked
2128 * via setSelection(..., seriesName, true).
2130 Dygraph
.prototype.isSeriesLocked
= function() {
2131 return this.lockedSet_
;
2135 * Fires when there's data available to be graphed.
2136 * @param {String} data Raw CSV data to be plotted
2139 Dygraph
.prototype.loadedEvent_
= function(data
) {
2140 this.rawData_
= this.parseCSV_(data
);
2145 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2148 Dygraph
.prototype.addXTicks_
= function() {
2149 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2151 if (this.dateWindow_
) {
2152 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2154 range
= this.xAxisExtremes();
2157 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2158 var xTicks
= xAxisOptionsView('ticker')(
2161 this.width_
, // TODO(danvk): should be area.width
2164 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2165 // console.log(msg);
2166 this.layout_
.setXTicks(xTicks
);
2171 * Computes the range of the data series (including confidence intervals).
2172 * @param { [Array] } series either [ [x1, y1], [x2, y2], ... ] or
2173 * [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
2174 * @return [low, high]
2176 Dygraph
.prototype.extremeValues_
= function(series
) {
2177 var minY
= null, maxY
= null, j
, y
;
2179 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2181 // With custom bars, maxY is the max of the high values.
2182 for (j
= 0; j
< series
.length
; j
++) {
2183 y
= series
[j
][1][0];
2184 if (y
=== null || isNaN(y
)) continue;
2185 var low
= y
- series
[j
][1][1];
2186 var high
= y
+ series
[j
][1][2];
2187 if (low
> y
) low
= y
; // this can happen with custom bars,
2188 if (high
< y
) high
= y
; // e.g. in tests/custom-bars
.html
2189 if (maxY
=== null || high
> maxY
) {
2192 if (minY
=== null || low
< minY
) {
2197 for (j
= 0; j
< series
.length
; j
++) {
2199 if (y
=== null || isNaN(y
)) continue;
2200 if (maxY
=== null || y
> maxY
) {
2203 if (minY
=== null || y
< minY
) {
2209 return [minY
, maxY
];
2214 * This function is called once when the chart's data is changed or the options
2215 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2216 * idea is that values derived from the chart's data can be computed here,
2217 * rather than every time the chart is drawn. This includes things like the
2218 * number of axes, rolling averages, etc.
2220 Dygraph
.prototype.predraw_
= function() {
2221 var start
= new Date();
2223 this.layout_
.computePlotArea();
2225 // TODO(danvk): move more computations out of drawGraph_ and into here.
2226 this.computeYAxes_();
2228 // Create a new plotter.
2229 if (this.plotter_
) {
2230 this.cascadeEvents_('clearChart');
2231 this.plotter_
.clear();
2233 this.plotter_
= new DygraphCanvasRenderer(this,
2238 // The roller sits in the bottom left corner of the chart. We don't know where
2239 // this will be until the options are available, so it's positioned here.
2240 this.createRollInterface_();
2242 this.cascadeEvents_('predraw');
2244 // Convert the raw data (a 2D array) into the internal format and compute
2245 // rolling averages.
2246 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2247 for (var i
= 1; i
< this.numColumns(); i
++) {
2248 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2249 var logScale
= this.attr_('logscale');
2250 var series
= this.extractSeries_(this.rawData_
, i
, logScale
);
2251 series
= this.rollingAverage(series
, this.rollPeriod_
);
2252 this.rolledSeries_
.push(series
);
2255 // If the data or options have changed, then we'd better redraw.
2258 // This is used to determine whether to do various animations.
2259 var end
= new Date();
2260 this.drawingTimeMs_
= (end
- start
);
2264 * Loop over all fields and create datasets, calculating extreme y-values for
2265 * each series and extreme x-indices as we go.
2267 * dateWindow is passed in as an explicit parameter so that we can compute
2268 * extreme values "speculatively", i.e. without actually setting state on the
2271 * TODO(danvk): make this more of a true function
2272 * @return [ datasets, seriesExtremes, boundaryIds ]
2275 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2276 var boundaryIds
= [];
2277 var cumulative_y
= []; // For stacked series.
2279 var extremes
= {}; // series name -> [low, high]
2282 // Loop over the fields (series). Go from the last to the first,
2283 // because if they're stacked that's how we accumulate the values.
2284 var num_series
= rolledSeries
.length
- 1;
2285 for (i
= num_series
; i
>= 1; i
--) {
2286 if (!this.visibility()[i
- 1]) continue;
2288 // Note: this copy _is_ necessary at the moment.
2289 // If you remove it, it breaks zooming with error bars on.
2290 // TODO(danvk): investigate further & write a test for this.
2292 for (j
= 0; j
< rolledSeries
[i
].length
; j
++) {
2293 series
.push(rolledSeries
[i
][j
]);
2296 // Prune down to the desired range, if necessary (for zooming)
2297 // Because there can be lines going to points outside of the visible area,
2298 // we actually prune to visible points, plus one on either side.
2299 var bars
= this.attr_("errorBars") || this.attr_("customBars");
2301 var low
= dateWindow
[0];
2302 var high
= dateWindow
[1];
2304 // TODO(danvk): do binary search instead of linear search.
2305 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2306 var firstIdx
= null, lastIdx
= null;
2307 for (k
= 0; k
< series
.length
; k
++) {
2308 if (series
[k
][0] >= low
&& firstIdx
=== null) {
2311 if (series
[k
][0] <= high
) {
2315 if (firstIdx
=== null) firstIdx
= 0;
2316 if (firstIdx
> 0) firstIdx
--;
2317 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2318 if (lastIdx
< series
.length
- 1) lastIdx
++;
2319 boundaryIds
[i
-1] = [firstIdx
, lastIdx
];
2320 for (k
= firstIdx
; k
<= lastIdx
; k
++) {
2321 pruned
.push(series
[k
]);
2325 boundaryIds
[i
-1] = [0, series
.length
-1];
2328 var seriesExtremes
= this.extremeValues_(series
);
2331 for (j
=0; j
<series
.length
; j
++) {
2332 series
[j
] = [series
[j
][0],
2337 } else if (this.attr_("stackedGraph")) {
2338 // Need to clear last_x explicitly as javascript's locals are
2339 // local to function, not to a block of statements
2340 var actual_y
, last_x
= null;
2341 for (j
= 0; j
< series
.length
; j
++) {
2342 // If one data set has a NaN, let all subsequent stacked
2343 // sets inherit the NaN -- only start at 0 for the first set.
2344 var x
= series
[j
][0];
2345 if (cumulative_y
[x
] === undefined
) {
2346 cumulative_y
[x
] = 0;
2349 actual_y
= series
[j
][1];
2350 if (actual_y
=== null) {
2351 series
[j
] = [x
, null];
2356 cumulative_y
[x
] += actual_y
;
2357 // If an x-value is repeated, we ignore the duplicates.
2361 series
[j
] = [x
, cumulative_y
[x
]];
2363 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2364 seriesExtremes
[1] = cumulative_y
[x
];
2366 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2367 seriesExtremes
[0] = cumulative_y
[x
];
2372 var seriesName
= this.attr_("labels")[i
];
2373 extremes
[seriesName
] = seriesExtremes
;
2374 datasets
[i
] = series
;
2377 // For stacked graphs, a NaN value for any point in the sum should create a
2378 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2379 if (this.attr_("stackedGraph")) {
2380 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2381 // Use the first nonempty dataset to get X values.
2382 if (!datasets
[k
]) continue;
2383 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2384 var x
= datasets
[k
][j
][0];
2385 if (isNaN(cumulative_y
[x
])) {
2386 // Set all Y values to NaN at that X value.
2387 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2388 if (!datasets
[i
]) continue;
2389 datasets
[i
][j
][1] = NaN
;
2397 return [ datasets
, extremes
, boundaryIds
];
2401 * Update the graph with new data. This method is called when the viewing area
2402 * has changed. If the underlying data or options have changed, predraw_ will
2403 * be called before drawGraph_ is called.
2407 Dygraph
.prototype.drawGraph_
= function() {
2408 var start
= new Date();
2410 // This is used to set the second parameter to drawCallback, below.
2411 var is_initial_draw
= this.is_initial_draw_
;
2412 this.is_initial_draw_
= false;
2414 this.layout_
.removeAllDatasets();
2416 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2418 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2419 var datasets
= packed
[0];
2420 var extremes
= packed
[1];
2421 this.boundaryIds_
= packed
[2];
2423 this.setIndexByName_
= {};
2424 var labels
= this.attr_("labels");
2425 if (labels
.length
> 0) {
2426 this.setIndexByName_
[labels
[0]] = 0;
2429 for (var i
= 1; i
< datasets
.length
; i
++) {
2430 this.setIndexByName_
[labels
[i
]] = i
;
2431 if (!this.visibility()[i
- 1]) continue;
2432 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2433 this.datasetIndex_
[i
] = dataIdx
++;
2436 this.computeYAxisRanges_(extremes
);
2437 this.layout_
.setYAxes(this.axes_
);
2441 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2442 var tmp_zoomed_x
= this.zoomed_x_
;
2443 // Tell PlotKit to use this new data and render itself
2444 this.layout_
.setDateWindow(this.dateWindow_
);
2445 this.zoomed_x_
= tmp_zoomed_x
;
2446 this.layout_
.evaluateWithError();
2447 this.renderGraph_(is_initial_draw
);
2449 if (this.attr_("timingName")) {
2450 var end
= new Date();
2451 Dygraph
.info(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2456 * This does the work of drawing the chart. It assumes that the layout and axis
2457 * scales have already been set (e.g. by predraw_).
2461 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2462 this.cascadeEvents_('clearChart');
2463 this.plotter_
.clear();
2465 if (this.attr_('underlayCallback')) {
2466 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2467 // users who expect a deprecated form of this callback.
2468 this.attr_('underlayCallback')(
2469 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2473 canvas
: this.hidden_
,
2474 drawingContext
: this.hidden_ctx_
2476 this.cascadeEvents_('willDrawChart', e
);
2477 this.plotter_
.render();
2478 this.cascadeEvents_('didDrawChart', e
);
2479 this.lastRow_
= -1; // because plugins/legend.js clears the legend
2481 // TODO(danvk): is this a performance bottleneck when panning?
2482 // The interaction canvas should already be empty in that situation.
2483 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2484 this.canvas_
.height
);
2486 if (this.attr_("drawCallback") !== null) {
2487 this.attr_("drawCallback")(this, is_initial_draw
);
2493 * Determine properties of the y-axes which are independent of the data
2494 * currently being displayed. This includes things like the number of axes and
2495 * the style of the axes. It does not include the range of each axis and its
2497 * This fills in this.axes_.
2498 * axes_ = [ { options } ]
2499 * indices are into the axes_ array.
2501 Dygraph
.prototype.computeYAxes_
= function() {
2502 // Preserve valueWindow settings if they exist, and if the user hasn't
2503 // specified a new valueRange.
2504 var valueWindows
, axis
, index
, opts
, v
;
2505 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2507 for (index
= 0; index
< this.axes_
.length
; index
++) {
2508 valueWindows
.push(this.axes_
[index
].valueWindow
);
2512 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2513 // data computation as well as options storage.
2514 // Go through once and add all the axes.
2517 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2518 // Add a new axis, making a copy of its per-axis options.
2519 opts
= { g
: this };
2520 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2521 this.axes_
[axis
] = opts
;
2525 // Copy global valueRange option over to the first axis.
2526 // NOTE(konigsberg): Are these two statements necessary?
2527 // I tried removing it. The automated tests pass, and manually
2528 // messing with tests/zoom
.html showed no trouble
.
2529 v
= this.attr_('valueRange');
2530 if (v
) this.axes_
[0].valueRange
= v
;
2532 if (valueWindows
!== undefined
) {
2533 // Restore valueWindow settings.
2535 // When going from two axes back to one, we only restore
2537 var idxCount
= Math
.min(valueWindows
.length
, this.axes_
.length
);
2539 for (index
= 0; index
< idxCount
; index
++) {
2540 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2544 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2546 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2547 v
= opts("valueRange");
2548 if (v
) this.axes_
[axis
].valueRange
= v
;
2549 } else { // To keep old behavior
2550 var axes
= this.user_attrs_
.axes
;
2551 if (axes
&& axes
.y2
) {
2552 v
= axes
.y2
.valueRange
;
2553 if (v
) this.axes_
[axis
].valueRange
= v
;
2560 * Returns the number of y-axes on the chart.
2561 * @return {Number} the number of axes.
2563 Dygraph
.prototype.numAxes
= function() {
2564 return this.attributes_
.numAxes();
2569 * Returns axis properties for the given series.
2570 * @param { String } setName The name of the series for which to get axis
2571 * properties, e.g. 'Y1'.
2572 * @return { Object } The axis properties.
2574 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2575 // TODO(danvk): handle errors.
2576 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2581 * Determine the value range and tick marks for each axis.
2582 * @param {Object} extremes A mapping from seriesName -> [low, high]
2583 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2585 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2586 var isNullUndefinedOrNaN
= function(num
) {
2587 return isNaN(parseFloat(num
));
2589 var numAxes
= this.attributes_
.numAxes();
2590 var ypadCompat
, span
, series
, ypad
;
2592 // Compute extreme values, a span and tick marks for each axis.
2593 for (var i
= 0; i
< numAxes
; i
++) {
2594 var axis
= this.axes_
[i
];
2595 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2596 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2597 series
= this.attributes_
.seriesForAxis(i
);
2599 // Add some padding. This supports two Y padding operation modes:
2601 // - backwards compatible (yRangePad not set):
2602 // 10% padding for automatic Y ranges, but not for user-supplied
2603 // ranges, and move a close-to-zero edge to zero except if
2604 // avoidMinZero is set, since drawing at the edge results in
2605 // invisible lines. Unfortunately lines drawn at the edge of a
2606 // user-supplied range will still be invisible. If logscale is
2607 // set, add a variable amount of padding at the top but
2608 // none at the bottom.
2610 // - new-style (yRangePad set by the user):
2611 // always add the specified Y padding.
2614 ypad
= 0.1; // add 10%
2615 if (this.attr_('yRangePad') !== null) {
2617 // Convert pixel padding to ratio
2618 ypad
= this.attr_('yRangePad') / this.plotter_
.area
.h
;
2621 if (series
.length
=== 0) {
2622 // If no series are defined or visible then use a reasonable default
2623 axis
.extremeRange
= [0, 1];
2625 // Calculate the extremes of extremes.
2626 var minY
= Infinity
; // extremes[series[0]][0];
2627 var maxY
= -Infinity
; // extremes[series[0]][1];
2628 var extremeMinY
, extremeMaxY
;
2630 for (var j
= 0; j
< series
.length
; j
++) {
2631 // this skips invisible series
2632 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2634 // Only use valid extremes to stop null data series' from corrupting the scale.
2635 extremeMinY
= extremes
[series
[j
]][0];
2636 if (extremeMinY
!== null) {
2637 minY
= Math
.min(extremeMinY
, minY
);
2639 extremeMaxY
= extremes
[series
[j
]][1];
2640 if (extremeMaxY
!== null) {
2641 maxY
= Math
.max(extremeMaxY
, maxY
);
2645 // Include zero if requested by the user.
2646 if (includeZero
&& !logscale
) {
2647 if (minY
> 0) minY
= 0;
2648 if (maxY
< 0) maxY
= 0;
2651 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2652 if (minY
== Infinity
) minY
= 0;
2653 if (maxY
== -Infinity
) maxY
= 1;
2656 // special case: if we have no sense of scale, center on the sole value.
2659 span
= Math
.abs(maxY
);
2661 // ... and if the sole value is zero, use range 0-1.
2667 var maxAxisY
, minAxisY
;
2670 maxAxisY
= maxY
+ ypad
* span
;
2673 var logpad
= Math
.exp(Math
.log(span
) * ypad
);
2674 maxAxisY
= maxY
* logpad
;
2675 minAxisY
= minY
/ logpad
;
2678 maxAxisY
= maxY
+ ypad
* span
;
2679 minAxisY
= minY
- ypad
* span
;
2681 // Backwards-compatible behavior: Move the span to start or end at zero if it's
2682 // close to zero, but not if avoidMinZero is set.
2683 if (ypadCompat
&& !this.attr_("avoidMinZero")) {
2684 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2685 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2688 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2690 if (axis
.valueWindow
) {
2691 // This is only set if the user has zoomed on the y-axis. It is never set
2692 // by a user. It takes precedence over axis.valueRange because, if you set
2693 // valueRange, you'd still expect to be able to pan.
2694 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2695 } else if (axis
.valueRange
) {
2696 // This is a user-set value range for this axis.
2697 var y0
= isNullUndefinedOrNaN(axis
.valueRange
[0]) ? axis
.extremeRange
[0] : axis
.valueRange
[0];
2698 var y1
= isNullUndefinedOrNaN(axis
.valueRange
[1]) ? axis
.extremeRange
[1] : axis
.valueRange
[1];
2700 if (axis
.logscale
) {
2701 var logpad
= Math
.exp(Math
.log(span
) * ypad
);
2710 axis
.computedValueRange
= [y0
, y1
];
2712 axis
.computedValueRange
= axis
.extremeRange
;
2715 // Add ticks. By default, all axes inherit the tick positions of the
2716 // primary axis. However, if an axis is specifically marked as having
2717 // independent ticks, then that is permissible as well.
2718 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2719 var ticker
= opts('ticker');
2720 if (i
=== 0 || axis
.independentTicks
) {
2721 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2722 axis
.computedValueRange
[1],
2723 this.height_
, // TODO(danvk): should be area.height
2727 var p_axis
= this.axes_
[0];
2728 var p_ticks
= p_axis
.ticks
;
2729 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2730 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2731 var tick_values
= [];
2732 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2733 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2734 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2735 tick_values
.push(y_val
);
2738 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2739 axis
.computedValueRange
[1],
2740 this.height_
, // TODO(danvk): should be area.height
2749 * Extracts one series from the raw data (a 2D array) into an array of (date,
2752 * This is where undesirable points (i.e. negative values on log scales and
2753 * missing values through which we wish to connect lines) are dropped.
2754 * TODO(danvk): the "missing values" bit above doesn't seem right.
2758 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2759 // TODO(danvk): pre-allocate series here.
2761 for (var j
= 0; j
< rawData
.length
; j
++) {
2762 var x
= rawData
[j
][0];
2763 var point
= rawData
[j
][i
];
2765 // On the log scale, points less than zero do not exist.
2766 // This will create a gap in the chart.
2771 series
.push([x
, point
]);
2778 * Calculates the rolling average of a data set.
2779 * If originalData is [label, val], rolls the average of those.
2780 * If originalData is [label, [, it's interpreted as [value, stddev]
2781 * and the roll is returned in the same form, with appropriately reduced
2782 * stddev for each value.
2783 * Note that this is where fractional input (i.e. '5/10') is converted into
2785 * @param {Array} originalData The data in the appropriate format (see above)
2786 * @param {Number} rollPeriod The number of points over which to average the
2789 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2790 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2791 var rollingData
= [];
2792 var sigma
= this.attr_("sigma");
2794 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2795 if (this.fractions_
) {
2797 var den
= 0; // numerator/denominator
2799 for (i
= 0; i
< originalData
.length
; i
++) {
2800 num
+= originalData
[i
][1][0];
2801 den
+= originalData
[i
][1][1];
2802 if (i
- rollPeriod
>= 0) {
2803 num
-= originalData
[i
- rollPeriod
][1][0];
2804 den
-= originalData
[i
- rollPeriod
][1][1];
2807 var date
= originalData
[i
][0];
2808 var value
= den
? num
/ den
: 0.0;
2809 if (this.attr_("errorBars")) {
2810 if (this.attr_("wilsonInterval")) {
2811 // For more details on this confidence interval, see:
2812 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2814 var p
= value
< 0 ? 0 : value
, n
= den
;
2815 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2816 var denom
= 1 + sigma
* sigma
/ den
;
2817 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2818 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2819 rollingData
[i
] = [date
,
2820 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2822 rollingData
[i
] = [date
, [0, 0, 0]];
2825 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2826 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2829 rollingData
[i
] = [date
, mult
* value
];
2832 } else if (this.attr_("customBars")) {
2837 for (i
= 0; i
< originalData
.length
; i
++) {
2838 var data
= originalData
[i
][1];
2840 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2842 if (y
!== null && !isNaN(y
)) {
2848 if (i
- rollPeriod
>= 0) {
2849 var prev
= originalData
[i
- rollPeriod
];
2850 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2858 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2859 1.0 * (mid
- low
) / count
,
2860 1.0 * (high
- mid
) / count
]];
2862 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2866 // Calculate the rolling average for the first rollPeriod - 1 points where
2867 // there is not enough data to roll over the full number of points
2868 if (!this.attr_("errorBars")){
2869 if (rollPeriod
== 1) {
2870 return originalData
;
2873 for (i
= 0; i
< originalData
.length
; i
++) {
2876 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2877 y
= originalData
[j
][1];
2878 if (y
=== null || isNaN(y
)) continue;
2880 sum
+= originalData
[j
][1];
2883 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2885 rollingData
[i
] = [originalData
[i
][0], null];
2890 for (i
= 0; i
< originalData
.length
; i
++) {
2894 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2895 y
= originalData
[j
][1][0];
2896 if (y
=== null || isNaN(y
)) continue;
2898 sum
+= originalData
[j
][1][0];
2899 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2902 stddev
= Math
.sqrt(variance
) / num_ok
;
2903 rollingData
[i
] = [originalData
[i
][0],
2904 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2906 // This explicitly preserves NaNs to aid with "independent series".
2907 // See testRollingAveragePreservesNaNs.
2908 var v
= (rollPeriod
== 1) ? originalData
[i
][1][0] : null;
2909 rollingData
[i
] = [originalData
[i
][0], [v
, v
, v
]];
2919 * Detects the type of the str (date or numeric) and sets the various
2920 * formatting attributes in this.attrs_ based on this type.
2921 * @param {String} str An x value.
2924 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2926 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2927 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2928 str
.indexOf('/') >= 0 ||
2929 isNaN(parseFloat(str
))) {
2931 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2932 // TODO(danvk): remove support for this format.
2936 this.setXAxisOptions_(isDate
);
2939 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2941 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2942 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2943 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2944 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2946 /** @private (shut up, jsdoc!) */
2947 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2948 // TODO(danvk): use Dygraph.numberValueFormatter here?
2949 /** @private (shut up, jsdoc!) */
2950 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2951 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2952 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2957 * Parses the value as a floating point number. This is like the parseFloat()
2958 * built-in, but with a few differences:
2959 * - the empty string is parsed as null, rather than NaN.
2960 * - if the string cannot be parsed at all, an error is logged.
2961 * If the string can't be parsed, this method returns null.
2962 * @param {String} x The string to be parsed
2963 * @param {Number} opt_line_no The line number from which the string comes.
2964 * @param {String} opt_line The text of the line from which the string comes.
2968 // Parse the x as a float or return null if it's not a number.
2969 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2970 var val
= parseFloat(x
);
2971 if (!isNaN(val
)) return val
;
2973 // Try to figure out what happeend.
2974 // If the value is the empty string, parse it as null.
2975 if (/^ *$/.test(x
)) return null;
2977 // If it was actually "NaN", return it as NaN.
2978 if (/^ *nan *$/i.test(x
)) return NaN
;
2980 // Looks like a parsing error.
2981 var msg
= "Unable to parse '" + x
+ "' as a number";
2982 if (opt_line
!== null && opt_line_no
!== null) {
2983 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2992 * Parses a string in a special csv format. We expect a csv file where each
2993 * line is a date point, and the first field in each line is the date string.
2994 * We also expect that all remaining fields represent series.
2995 * if the errorBars attribute is set, then interpret the fields as:
2996 * date, series1, stddev1, series2, stddev2, ...
2997 * @param {[Object]} data See above.
2999 * @return [Object] An array with one entry for each row. These entries
3000 * are an array of cells in that row. The first entry is the parsed x-value for
3001 * the row. The second, third, etc. are the y-values. These can take on one of
3002 * three forms, depending on the CSV and constructor parameters:
3004 * 2. [ value, stddev ]
3005 * 3. [ low value, center value, high value ]
3007 Dygraph
.prototype.parseCSV_
= function(data
) {
3009 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3010 var lines
= data
.split(line_delimiter
|| "\n");
3013 // Use the default delimiter or fall back to a tab if that makes sense.
3014 var delim
= this.attr_('delimiter');
3015 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
3020 if (!('labels' in this.user_attrs_
)) {
3021 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
3023 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
3024 this.attributes_
.reparseSeries();
3029 var defaultParserSet
= false; // attempt to auto-detect x value type
3030 var expectedCols
= this.attr_("labels").length
;
3031 var outOfOrder
= false;
3032 for (var i
= start
; i
< lines
.length
; i
++) {
3033 var line
= lines
[i
];
3035 if (line
.length
=== 0) continue; // skip blank lines
3036 if (line
[0] == '#') continue; // skip comment lines
3037 var inFields
= line
.split(delim
);
3038 if (inFields
.length
< 2) continue;
3041 if (!defaultParserSet
) {
3042 this.detectTypeFromString_(inFields
[0]);
3043 xParser
= this.attr_("xValueParser");
3044 defaultParserSet
= true;
3046 fields
[0] = xParser(inFields
[0], this);
3048 // If fractions are expected, parse the numbers as "A/B
"
3049 if (this.fractions_) {
3050 for (j = 1; j < inFields.length; j++) {
3051 // TODO(danvk): figure out an appropriate way to flag parse errors.
3052 vals = inFields[j].split("/");
3053 if (vals.length != 2) {
3054 this.error('Expected fractional "num
/den
" values in CSV data ' +
3055 "but found a value
'" + inFields[j] + "' on line
" +
3056 (1 + i) + " ('" + line + "') which is not of
this form
.");
3059 fields[j] = [this.parseFloat_(vals[0], i, line),
3060 this.parseFloat_(vals[1], i, line)];
3063 } else if (this.attr_("errorBars
")) {
3064 // If there are error bars, values are (value, stddev) pairs
3065 if (inFields.length % 2 != 1) {
3066 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
3067 'but line ' + (1 + i) + ' has an odd number of values (' +
3068 (inFields.length - 1) + "): '" + line + "'");
3070 for (j = 1; j < inFields.length; j += 2) {
3071 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
3072 this.parseFloat_(inFields[j + 1], i, line)];
3074 } else if (this.attr_("customBars
")) {
3075 // Bars are a low;center;high tuple
3076 for (j = 1; j < inFields.length; j++) {
3077 var val = inFields[j];
3078 if (/^ *$/.test(val)) {
3079 fields[j] = [null, null, null];
3081 vals = val.split(";");
3082 if (vals.length == 3) {
3083 fields[j] = [ this.parseFloat_(vals[0], i, line),
3084 this.parseFloat_(vals[1], i, line),
3085 this.parseFloat_(vals[2], i, line) ];
3087 this.warn('When using customBars, values must be either blank ' +
3088 'or "low
;center
;high
" tuples (got "' + val +
3089 '" on line ' + (1+i));
3094 // Values are just numbers
3095 for (j = 1; j < inFields.length; j++) {
3096 fields[j] = this.parseFloat_(inFields[j], i, line);
3099 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
3103 if (fields.length != expectedCols) {
3104 this.error("Number of columns
in line
" + i + " (" + fields.length +
3105 ") does not agree
with number of
labels (" + expectedCols +
3109 // If the user specified the 'labels' option and none of the cells of the
3110 // first row parsed correctly, then they probably double-specified the
3111 // labels. We go with the values set in the option, discard this row and
3112 // log a warning to the JS console.
3113 if (i === 0 && this.attr_('labels')) {
3114 var all_null = true;
3115 for (j = 0; all_null && j < fields.length; j++) {
3116 if (fields[j]) all_null = false;
3119 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3120 "CSV
data ('" + line + "') appears to also contain labels
. " +
3121 "Will drop the CSV labels and
use the option labels
.");
3129 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3130 ret.sort(function(a,b) { return a[0] - b[0]; });
3138 * The user has provided their data as a pre-packaged JS array. If the x values
3139 * are numeric, this is the same as dygraphs' internal format. If the x values
3140 * are dates, we need to convert them from Date objects to ms since epoch.
3141 * @param {[Object]} data
3142 * @return {[Object]} data with numeric x values.
3144 Dygraph.prototype.parseArray_ = function(data) {
3145 // Peek at the first x value to see if it's numeric.
3146 if (data.length === 0) {
3147 this.error("Can
't plot empty data set");
3150 if (data[0].length === 0) {
3151 this.error("Data set cannot contain an empty row");
3156 if (this.attr_("labels") === null) {
3157 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3158 "in the options parameter");
3159 this.attrs_.labels = [ "X" ];
3160 for (i = 1; i < data[0].length; i++) {
3161 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3163 this.attributes_.reparseSeries();
3165 var num_labels = this.attr_("labels");
3166 if (num_labels.length != data[0].length) {
3167 this.error("Mismatch between number of labels (" + num_labels +
3168 ") and number of columns in array (" + data[0].length + ")");
3173 if (Dygraph.isDateLike(data[0][0])) {
3174 // Some intelligent defaults for a date x-axis.
3175 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3176 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3177 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3179 // Assume they're all dates
.
3180 var parsedData
= Dygraph
.clone(data
);
3181 for (i
= 0; i
< data
.length
; i
++) {
3182 if (parsedData
[i
].length
=== 0) {
3183 this.error("Row " + (1 + i
) + " of data is empty");
3186 if (parsedData
[i
][0] === null ||
3187 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3188 isNaN(parsedData
[i
][0].getTime())) {
3189 this.error("x value in row " + (1 + i
) + " is not a Date");
3192 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3196 // Some intelligent defaults for a numeric x-axis.
3197 /** @private (shut up, jsdoc!) */
3198 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3199 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3200 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3206 * Parses a DataTable object from gviz.
3207 * The data is expected to have a first column that is either a date or a
3208 * number. All subsequent columns must be numbers. If there is a clear mismatch
3209 * between this.xValueParser_ and the type of the first column, it will be
3210 * fixed. Fills out rawData_.
3211 * @param {[Object]} data See above.
3214 Dygraph
.prototype.parseDataTable_
= function(data
) {
3215 var shortTextForAnnotationNum
= function(num
) {
3216 // converts [0-9]+ [A-Z][a-z]*
3217 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3218 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3219 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3220 num
= Math
.floor(num
/ 26);
3222 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3223 num
= Math
.floor((num
- 1) / 26);
3228 var cols
= data
.getNumberOfColumns();
3229 var rows
= data
.getNumberOfRows();
3231 var indepType
= data
.getColumnType(0);
3232 if (indepType
== 'date' || indepType
== 'datetime') {
3233 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3234 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3235 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3236 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3237 } else if (indepType
== 'number') {
3238 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3239 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3240 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3241 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3243 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3244 "column 1 of DataTable input (Got '" + indepType
+ "')");
3248 // Array of the column indices which contain data (and not annotations).
3250 var annotationCols
= {}; // data index -> [annotation cols]
3251 var hasAnnotations
= false;
3253 for (i
= 1; i
< cols
; i
++) {
3254 var type
= data
.getColumnType(i
);
3255 if (type
== 'number') {
3257 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3258 // This is OK -- it's an annotation column.
3259 var dataIdx
= colIdx
[colIdx
.length
- 1];
3260 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3261 annotationCols
[dataIdx
] = [i
];
3263 annotationCols
[dataIdx
].push(i
);
3265 hasAnnotations
= true;
3267 this.error("Only 'number' is supported as a dependent type with Gviz." +
3268 " 'string' is only supported if displayAnnotations is true");
3272 // Read column labels
3273 // TODO(danvk): add support back for errorBars
3274 var labels
= [data
.getColumnLabel(0)];
3275 for (i
= 0; i
< colIdx
.length
; i
++) {
3276 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3277 if (this.attr_("errorBars")) i
+= 1;
3279 this.attrs_
.labels
= labels
;
3280 cols
= labels
.length
;
3283 var outOfOrder
= false;
3284 var annotations
= [];
3285 for (i
= 0; i
< rows
; i
++) {
3287 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3288 data
.getValue(i
, 0) === null) {
3289 this.warn("Ignoring row " + i
+
3290 " of DataTable because of undefined or null first column.");
3294 if (indepType
== 'date' || indepType
== 'datetime') {
3295 row
.push(data
.getValue(i
, 0).getTime());
3297 row
.push(data
.getValue(i
, 0));
3299 if (!this.attr_("errorBars")) {
3300 for (j
= 0; j
< colIdx
.length
; j
++) {
3301 var col
= colIdx
[j
];
3302 row
.push(data
.getValue(i
, col
));
3303 if (hasAnnotations
&&
3304 annotationCols
.hasOwnProperty(col
) &&
3305 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3307 ann
.series
= data
.getColumnLabel(col
);
3309 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3311 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3312 if (k
) ann
.text
+= "\n";
3313 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3315 annotations
.push(ann
);
3319 // Strip out infinities, which give dygraphs problems later on.
3320 for (j
= 0; j
< row
.length
; j
++) {
3321 if (!isFinite(row
[j
])) row
[j
] = null;
3324 for (j
= 0; j
< cols
- 1; j
++) {
3325 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3328 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3335 this.warn("DataTable is out of order; order it correctly to speed loading.");
3336 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3338 this.rawData_
= ret
;
3340 if (annotations
.length
> 0) {
3341 this.setAnnotations(annotations
, true);
3343 this.attributes_
.reparseSeries();
3347 * Get the CSV data. If it's in a function, call that function. If it's in a
3348 * file, do an XMLHttpRequest to get it.
3351 Dygraph
.prototype.start_
= function() {
3352 var data
= this.file_
;
3354 // Functions can return references of all other types.
3355 if (typeof data
== 'function') {
3359 if (Dygraph
.isArrayLike(data
)) {
3360 this.rawData_
= this.parseArray_(data
);
3362 } else if (typeof data
== 'object' &&
3363 typeof data
.getColumnRange
== 'function') {
3364 // must be a DataTable from gviz.
3365 this.parseDataTable_(data
);
3367 } else if (typeof data
== 'string') {
3368 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3369 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3370 if (line_delimiter
) {
3371 this.loadedEvent_(data
);
3373 var req
= new XMLHttpRequest();
3375 req
.onreadystatechange
= function () {
3376 if (req
.readyState
== 4) {
3377 if (req
.status
=== 200 || // Normal http
3378 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3379 caller
.loadedEvent_(req
.responseText
);
3384 req
.open("GET", data
, true);
3388 this.error("Unknown data format: " + (typeof data
));
3393 * Changes various properties of the graph. These can include:
3395 * <li>file: changes the source data for the graph</li>
3396 * <li>errorBars: changes whether the data contains stddev</li>
3399 * There's a huge variety of options that can be passed to this method. For a
3400 * full list, see http://dygraphs.com/options.html.
3402 * @param {Object} attrs The new properties and values
3403 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3404 * call to updateOptions(). If you know better, you can pass true to explicitly
3405 * block the redraw. This can be useful for chaining updateOptions() calls,
3406 * avoiding the occasional infinite loop and preventing redraws when it's not
3407 * necessary (e.g. when updating a callback).
3409 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3410 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3412 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3413 var file
= input_attrs
.file
;
3414 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3416 // TODO(danvk): this is a mess. Move these options into attr_.
3417 if ('rollPeriod' in attrs
) {
3418 this.rollPeriod_
= attrs
.rollPeriod
;
3420 if ('dateWindow' in attrs
) {
3421 this.dateWindow_
= attrs
.dateWindow
;
3422 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3423 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3426 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3427 this.zoomed_y_
= (attrs
.valueRange
!== null);
3430 // TODO(danvk): validate per-series options.
3435 // highlightCircleSize
3437 // Check if this set options will require new points.
3438 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3440 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3442 this.attributes_
.reparseSeries();
3446 if (!block_redraw
) this.start_();
3448 if (!block_redraw
) {
3449 if (requiresNewPoints
) {
3452 this.renderGraph_(false);
3459 * Returns a copy of the options with deprecated names converted into current
3460 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3461 * interested in that, they should save a copy before calling this.
3464 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3466 for (var k
in attrs
) {
3467 if (k
== 'file') continue;
3468 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3471 var set
= function(axis
, opt
, value
) {
3472 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3473 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3474 my_attrs
.axes
[axis
][opt
] = value
;
3476 var map
= function(opt
, axis
, new_opt
) {
3477 if (typeof(attrs
[opt
]) != 'undefined') {
3478 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3479 new_opt
+ " option for the " + axis
+ " axis instead. " +
3480 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3481 "(see http://dygraphs.com/per-axis.html for more information.");
3482 set(axis
, new_opt
, attrs
[opt
]);
3483 delete my_attrs
[opt
];
3487 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3488 map('xValueFormatter', 'x', 'valueFormatter');
3489 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3490 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3491 map('xTicker', 'x', 'ticker');
3492 map('yValueFormatter', 'y', 'valueFormatter');
3493 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3494 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3495 map('yTicker', 'y', 'ticker');
3500 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3501 * containing div (which has presumably changed size since the dygraph was
3502 * instantiated. If the width/height are specified, the div will be resized.
3504 * This is far more efficient than destroying and re-instantiating a
3505 * Dygraph, since it doesn't have to reparse the underlying data.
3507 * @param {Number} [width] Width (in pixels)
3508 * @param {Number} [height] Height (in pixels)
3510 Dygraph
.prototype.resize
= function(width
, height
) {
3511 if (this.resize_lock
) {
3514 this.resize_lock
= true;
3516 if ((width
=== null) != (height
=== null)) {
3517 this.warn("Dygraph.resize() should be called with zero parameters or " +
3518 "two non-NULL parameters. Pretending it was zero.");
3519 width
= height
= null;
3522 var old_width
= this.width_
;
3523 var old_height
= this.height_
;
3526 this.maindiv_
.style
.width
= width
+ "px";
3527 this.maindiv_
.style
.height
= height
+ "px";
3528 this.width_
= width
;
3529 this.height_
= height
;
3531 this.width_
= this.maindiv_
.clientWidth
;
3532 this.height_
= this.maindiv_
.clientHeight
;
3535 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3536 // TODO(danvk): there should be a clear() method.
3537 this.maindiv_
.innerHTML
= "";
3538 this.roller_
= null;
3539 this.attrs_
.labelsDiv
= null;
3540 this.createInterface_();
3541 if (this.annotations_
.length
) {
3542 // createInterface_ reset the layout, so we need to do this.
3543 this.layout_
.setAnnotations(this.annotations_
);
3545 this.createDragInterface_();
3549 this.resize_lock
= false;
3553 * Adjusts the number of points in the rolling average. Updates the graph to
3554 * reflect the new averaging period.
3555 * @param {Number} length Number of points over which to average the data.
3557 Dygraph
.prototype.adjustRoll
= function(length
) {
3558 this.rollPeriod_
= length
;
3563 * Returns a boolean array of visibility statuses.
3565 Dygraph
.prototype.visibility
= function() {
3566 // Do lazy-initialization, so that this happens after we know the number of
3568 if (!this.attr_("visibility")) {
3569 this.attrs_
.visibility
= [];
3571 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3572 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3573 this.attrs_
.visibility
.push(true);
3575 return this.attr_("visibility");
3579 * Changes the visiblity of a series.
3581 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3582 var x
= this.visibility();
3583 if (num
< 0 || num
>= x
.length
) {
3584 this.warn("invalid series number in setVisibility: " + num
);
3592 * How large of an area will the dygraph render itself in?
3593 * This is used for testing.
3594 * @return A {width: w, height: h} object.
3597 Dygraph
.prototype.size
= function() {
3598 return { width
: this.width_
, height
: this.height_
};
3602 * Update the list of annotations and redraw the chart.
3603 * See dygraphs.com/annotations.html for more info on how to use annotations.
3604 * @param ann {Array} An array of annotation objects.
3605 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3607 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3608 // Only add the annotation CSS rule once we know it will be used.
3609 Dygraph
.addAnnotationRule();
3610 this.annotations_
= ann
;
3611 if (!this.layout_
) {
3612 this.warn("Tried to setAnnotations before dygraph was ready. " +
3613 "Try setting them in a drawCallback. See " +
3614 "dygraphs.com/tests/annotation.html");
3618 this.layout_
.setAnnotations(this.annotations_
);
3619 if (!suppressDraw
) {
3625 * Return the list of annotations.
3627 Dygraph
.prototype.annotations
= function() {
3628 return this.annotations_
;
3632 * Get the list of label names for this graph. The first column is the
3633 * x-axis, so the data series names start at index 1.
3635 * Returns null when labels have not yet been defined.
3637 Dygraph
.prototype.getLabels
= function() {
3638 var labels
= this.attr_("labels");
3639 return labels
? labels
.slice() : null;
3643 * Get the index of a series (column) given its name. The first column is the
3644 * x-axis, so the data series start with index 1.
3646 Dygraph
.prototype.indexFromSetName
= function(name
) {
3647 return this.setIndexByName_
[name
];
3651 * Get the internal dataset index given its name. These are numbered starting from 0,
3652 * and only count visible sets.
3655 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3656 return this.datasetIndex_
[this.indexFromSetName(name
)];
3661 * Adds a default style for the annotation CSS classes to the document. This is
3662 * only executed when annotations are actually used. It is designed to only be
3663 * called once -- all calls after the first will return immediately.
3665 Dygraph
.addAnnotationRule
= function() {
3666 // TODO(danvk): move this function into plugins/annotations.js
?
3667 if (Dygraph
.addedAnnotationCSS
) return;
3669 var rule
= "border: 1px solid black; " +
3670 "background-color: white; " +
3671 "text-align: center;";
3673 var styleSheetElement
= document
.createElement("style");
3674 styleSheetElement
.type
= "text/css";
3675 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3677 // Find the first style sheet that we can access.
3678 // We may not add a rule to a style sheet from another domain for security
3679 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3680 // adds its own style sheets from google.com.
3681 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3682 if (document
.styleSheets
[i
].disabled
) continue;
3683 var mysheet
= document
.styleSheets
[i
];
3685 if (mysheet
.insertRule
) { // Firefox
3686 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3687 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3688 } else if (mysheet
.addRule
) { // IE
3689 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3691 Dygraph
.addedAnnotationCSS
= true;
3694 // Was likely a security exception.
3698 this.warn("Unable to add default annotation CSS rule; display may be off.");
3701 // Older pages may still use this name.
3702 var DateGraph
= Dygraph
;