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
,
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 var actual_y
, last_x
;
2339 for (j
= 0; j
< series
.length
; j
++) {
2340 // If one data set has a NaN, let all subsequent stacked
2341 // sets inherit the NaN -- only start at 0 for the first set.
2342 var x
= series
[j
][0];
2343 if (cumulative_y
[x
] === undefined
) {
2344 cumulative_y
[x
] = 0;
2347 actual_y
= series
[j
][1];
2348 if (actual_y
=== null) {
2349 series
[j
] = [x
, null];
2353 if (j
=== 0 || last_x
!= x
) {
2354 cumulative_y
[x
] += actual_y
;
2355 // If an x-value is repeated, we ignore the duplicates.
2359 series
[j
] = [x
, cumulative_y
[x
]];
2361 if (cumulative_y
[x
] > seriesExtremes
[1]) {
2362 seriesExtremes
[1] = cumulative_y
[x
];
2364 if (cumulative_y
[x
] < seriesExtremes
[0]) {
2365 seriesExtremes
[0] = cumulative_y
[x
];
2370 var seriesName
= this.attr_("labels")[i
];
2371 extremes
[seriesName
] = seriesExtremes
;
2372 datasets
[i
] = series
;
2375 // For stacked graphs, a NaN value for any point in the sum should create a
2376 // clean gap in the graph. Back-propagate NaNs to all points at this X value.
2377 if (this.attr_("stackedGraph")) {
2378 for (k
= datasets
.length
- 1; k
>= 0; --k
) {
2379 // Use the first nonempty dataset to get X values.
2380 if (!datasets
[k
]) continue;
2381 for (j
= 0; j
< datasets
[k
].length
; j
++) {
2382 var x
= datasets
[k
][j
][0];
2383 if (isNaN(cumulative_y
[x
])) {
2384 // Set all Y values to NaN at that X value.
2385 for (i
= datasets
.length
- 1; i
>= 0; i
--) {
2386 if (!datasets
[i
]) continue;
2387 datasets
[i
][j
][1] = NaN
;
2395 return [ datasets
, extremes
, boundaryIds
];
2399 * Update the graph with new data. This method is called when the viewing area
2400 * has changed. If the underlying data or options have changed, predraw_ will
2401 * be called before drawGraph_ is called.
2405 Dygraph
.prototype.drawGraph_
= function() {
2406 var start
= new Date();
2408 // This is used to set the second parameter to drawCallback, below.
2409 var is_initial_draw
= this.is_initial_draw_
;
2410 this.is_initial_draw_
= false;
2412 this.layout_
.removeAllDatasets();
2414 this.attrs_
.pointSize
= 0.5 * this.attr_('highlightCircleSize');
2416 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2417 var datasets
= packed
[0];
2418 var extremes
= packed
[1];
2419 this.boundaryIds_
= packed
[2];
2421 this.setIndexByName_
= {};
2422 var labels
= this.attr_("labels");
2423 if (labels
.length
> 0) {
2424 this.setIndexByName_
[labels
[0]] = 0;
2427 for (var i
= 1; i
< datasets
.length
; i
++) {
2428 this.setIndexByName_
[labels
[i
]] = i
;
2429 if (!this.visibility()[i
- 1]) continue;
2430 this.layout_
.addDataset(labels
[i
], datasets
[i
]);
2431 this.datasetIndex_
[i
] = dataIdx
++;
2434 this.computeYAxisRanges_(extremes
);
2435 this.layout_
.setYAxes(this.axes_
);
2439 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2440 var tmp_zoomed_x
= this.zoomed_x_
;
2441 // Tell PlotKit to use this new data and render itself
2442 this.layout_
.setDateWindow(this.dateWindow_
);
2443 this.zoomed_x_
= tmp_zoomed_x
;
2444 this.layout_
.evaluateWithError();
2445 this.renderGraph_(is_initial_draw
);
2447 if (this.attr_("timingName")) {
2448 var end
= new Date();
2449 Dygraph
.info(this.attr_("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2454 * This does the work of drawing the chart. It assumes that the layout and axis
2455 * scales have already been set (e.g. by predraw_).
2459 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2460 this.cascadeEvents_('clearChart');
2461 this.plotter_
.clear();
2463 if (this.attr_('underlayCallback')) {
2464 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2465 // users who expect a deprecated form of this callback.
2466 this.attr_('underlayCallback')(
2467 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2471 canvas
: this.hidden_
,
2472 drawingContext
: this.hidden_ctx_
2474 this.cascadeEvents_('willDrawChart', e
);
2475 this.plotter_
.render();
2476 this.cascadeEvents_('didDrawChart', e
);
2477 this.lastRow_
= -1; // because plugins/legend.js clears the legend
2479 // TODO(danvk): is this a performance bottleneck when panning?
2480 // The interaction canvas should already be empty in that situation.
2481 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2482 this.canvas_
.height
);
2484 if (this.attr_("drawCallback") !== null) {
2485 this.attr_("drawCallback")(this, is_initial_draw
);
2491 * Determine properties of the y-axes which are independent of the data
2492 * currently being displayed. This includes things like the number of axes and
2493 * the style of the axes. It does not include the range of each axis and its
2495 * This fills in this.axes_.
2496 * axes_ = [ { options } ]
2497 * indices are into the axes_ array.
2499 Dygraph
.prototype.computeYAxes_
= function() {
2500 // Preserve valueWindow settings if they exist, and if the user hasn't
2501 // specified a new valueRange.
2502 var valueWindows
, axis
, index
, opts
, v
;
2503 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2505 for (index
= 0; index
< this.axes_
.length
; index
++) {
2506 valueWindows
.push(this.axes_
[index
].valueWindow
);
2510 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2511 // data computation as well as options storage.
2512 // Go through once and add all the axes.
2515 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2516 // Add a new axis, making a copy of its per-axis options.
2517 opts
= { g
: this };
2518 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2519 this.axes_
[axis
] = opts
;
2523 // Copy global valueRange option over to the first axis.
2524 // NOTE(konigsberg): Are these two statements necessary?
2525 // I tried removing it. The automated tests pass, and manually
2526 // messing with tests/zoom
.html showed no trouble
.
2527 v
= this.attr_('valueRange');
2528 if (v
) this.axes_
[0].valueRange
= v
;
2530 if (valueWindows
!== undefined
) {
2531 // Restore valueWindow settings.
2532 for (index
= 0; index
< valueWindows
.length
; index
++) {
2533 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2537 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2539 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2540 v
= opts("valueRange");
2541 if (v
) this.axes_
[axis
].valueRange
= v
;
2542 } else { // To keep old behavior
2543 var axes
= this.user_attrs_
.axes
;
2544 if (axes
&& axes
.y2
) {
2545 v
= axes
.y2
.valueRange
;
2546 if (v
) this.axes_
[axis
].valueRange
= v
;
2553 * Returns the number of y-axes on the chart.
2554 * @return {Number} the number of axes.
2556 Dygraph
.prototype.numAxes
= function() {
2557 return this.attributes_
.numAxes();
2562 * Returns axis properties for the given series.
2563 * @param { String } setName The name of the series for which to get axis
2564 * properties, e.g. 'Y1'.
2565 * @return { Object } The axis properties.
2567 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2568 // TODO(danvk): handle errors.
2569 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2574 * Determine the value range and tick marks for each axis.
2575 * @param {Object} extremes A mapping from seriesName -> [low, high]
2576 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2578 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2579 var isNullUndefinedOrNaN
= function(num
) {
2580 return isNaN(parseFloat(num
));
2582 var numAxes
= this.attributes_
.numAxes();
2583 var ypadCompat
, span
, series
, ypad
;
2585 // Compute extreme values, a span and tick marks for each axis.
2586 for (var i
= 0; i
< numAxes
; i
++) {
2587 var axis
= this.axes_
[i
];
2588 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2589 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2590 series
= this.attributes_
.seriesForAxis(i
);
2592 if (series
.length
=== 0) {
2593 // If no series are defined or visible then use a reasonable default
2594 axis
.extremeRange
= [0, 1];
2596 // Calculate the extremes of extremes.
2597 var minY
= Infinity
; // extremes[series[0]][0];
2598 var maxY
= -Infinity
; // extremes[series[0]][1];
2599 var extremeMinY
, extremeMaxY
;
2601 for (var j
= 0; j
< series
.length
; j
++) {
2602 // this skips invisible series
2603 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2605 // Only use valid extremes to stop null data series' from corrupting the scale.
2606 extremeMinY
= extremes
[series
[j
]][0];
2607 if (extremeMinY
!== null) {
2608 minY
= Math
.min(extremeMinY
, minY
);
2610 extremeMaxY
= extremes
[series
[j
]][1];
2611 if (extremeMaxY
!== null) {
2612 maxY
= Math
.max(extremeMaxY
, maxY
);
2616 // Include zero if requested by the user.
2617 if (includeZero
&& !logscale
) {
2618 if (minY
> 0) minY
= 0;
2619 if (maxY
< 0) maxY
= 0;
2622 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2623 if (minY
== Infinity
) minY
= 0;
2624 if (maxY
== -Infinity
) maxY
= 1;
2627 // special case: if we have no sense of scale, center on the sole value.
2630 span
= Math
.abs(maxY
);
2632 // ... and if the sole value is zero, use range 0-1.
2638 // Add some padding. This supports two Y padding operation modes:
2640 // - backwards compatible (yRangePad not set):
2641 // 10% padding for automatic Y ranges, but not for user-supplied
2642 // ranges, and move a close-to-zero edge to zero except if
2643 // avoidMinZero is set, since drawing at the edge results in
2644 // invisible lines. Unfortunately lines drawn at the edge of a
2645 // user-supplied range will still be invisible. If logscale is
2646 // set, add a variable amount of padding at the top but
2647 // none at the bottom.
2649 // - new-style (yRangePad set by the user):
2650 // always add the specified Y padding.
2653 ypad
= 0.1; // add 10%
2654 if (this.attr_('yRangePad') !== null) {
2656 // Convert pixel padding to ratio
2657 ypad
= this.attr_('yRangePad') / this.plotter_
.area
.h
;
2660 var maxAxisY
, minAxisY
;
2663 maxAxisY
= maxY
+ ypad
* span
;
2666 var logpad
= Math
.exp(Math
.log(span
) * ypad
);
2667 maxAxisY
= maxY
* logpad
;
2668 minAxisY
= minY
/ logpad
;
2671 maxAxisY
= maxY
+ ypad
* span
;
2672 minAxisY
= minY
- ypad
* span
;
2674 // Backwards-compatible behavior: Move the span to start or end at zero if it's
2675 // close to zero, but not if avoidMinZero is set.
2676 if (ypadCompat
&& !this.attr_("avoidMinZero")) {
2677 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2678 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2681 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2683 if (axis
.valueWindow
) {
2684 // This is only set if the user has zoomed on the y-axis. It is never set
2685 // by a user. It takes precedence over axis.valueRange because, if you set
2686 // valueRange, you'd still expect to be able to pan.
2687 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2688 } else if (axis
.valueRange
) {
2689 // This is a user-set value range for this axis.
2690 var y0
= isNullUndefinedOrNaN(axis
.valueRange
[0]) ? axis
.extremeRange
[0] : axis
.valueRange
[0];
2691 var y1
= isNullUndefinedOrNaN(axis
.valueRange
[1]) ? axis
.extremeRange
[1] : axis
.valueRange
[1];
2693 if (axis
.logscale
) {
2694 var logpad
= Math
.exp(Math
.log(span
) * ypad
);
2703 axis
.computedValueRange
= [y0
, y1
];
2705 axis
.computedValueRange
= axis
.extremeRange
;
2708 // Add ticks. By default, all axes inherit the tick positions of the
2709 // primary axis. However, if an axis is specifically marked as having
2710 // independent ticks, then that is permissible as well.
2711 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2712 var ticker
= opts('ticker');
2713 if (i
=== 0 || axis
.independentTicks
) {
2714 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2715 axis
.computedValueRange
[1],
2716 this.height_
, // TODO(danvk): should be area.height
2720 var p_axis
= this.axes_
[0];
2721 var p_ticks
= p_axis
.ticks
;
2722 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2723 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2724 var tick_values
= [];
2725 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2726 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2727 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2728 tick_values
.push(y_val
);
2731 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2732 axis
.computedValueRange
[1],
2733 this.height_
, // TODO(danvk): should be area.height
2742 * Extracts one series from the raw data (a 2D array) into an array of (date,
2745 * This is where undesirable points (i.e. negative values on log scales and
2746 * missing values through which we wish to connect lines) are dropped.
2747 * TODO(danvk): the "missing values" bit above doesn't seem right.
2751 Dygraph
.prototype.extractSeries_
= function(rawData
, i
, logScale
) {
2752 // TODO(danvk): pre-allocate series here.
2754 for (var j
= 0; j
< rawData
.length
; j
++) {
2755 var x
= rawData
[j
][0];
2756 var point
= rawData
[j
][i
];
2758 // On the log scale, points less than zero do not exist.
2759 // This will create a gap in the chart.
2764 series
.push([x
, point
]);
2771 * Calculates the rolling average of a data set.
2772 * If originalData is [label, val], rolls the average of those.
2773 * If originalData is [label, [, it's interpreted as [value, stddev]
2774 * and the roll is returned in the same form, with appropriately reduced
2775 * stddev for each value.
2776 * Note that this is where fractional input (i.e. '5/10') is converted into
2778 * @param {Array} originalData The data in the appropriate format (see above)
2779 * @param {Number} rollPeriod The number of points over which to average the
2782 Dygraph
.prototype.rollingAverage
= function(originalData
, rollPeriod
) {
2783 rollPeriod
= Math
.min(rollPeriod
, originalData
.length
);
2784 var rollingData
= [];
2785 var sigma
= this.attr_("sigma");
2787 var low
, high
, i
, j
, y
, sum
, num_ok
, stddev
;
2788 if (this.fractions_
) {
2790 var den
= 0; // numerator/denominator
2792 for (i
= 0; i
< originalData
.length
; i
++) {
2793 num
+= originalData
[i
][1][0];
2794 den
+= originalData
[i
][1][1];
2795 if (i
- rollPeriod
>= 0) {
2796 num
-= originalData
[i
- rollPeriod
][1][0];
2797 den
-= originalData
[i
- rollPeriod
][1][1];
2800 var date
= originalData
[i
][0];
2801 var value
= den
? num
/ den
: 0.0;
2802 if (this.attr_("errorBars")) {
2803 if (this.attr_("wilsonInterval")) {
2804 // For more details on this confidence interval, see:
2805 // http://en.wikipedia.org/wiki
/Binomial_confidence_interval
2807 var p
= value
< 0 ? 0 : value
, n
= den
;
2808 var pm
= sigma
* Math
.sqrt(p
*(1-p
)/n + sigma*sigma/(4*n
*n
));
2809 var denom
= 1 + sigma
* sigma
/ den
;
2810 low
= (p
+ sigma
* sigma
/ (2 * den) - pm) / denom
;
2811 high
= (p
+ sigma
* sigma
/ (2 * den) + pm) / denom
;
2812 rollingData
[i
] = [date
,
2813 [p
* mult
, (p
- low
) * mult
, (high
- p
) * mult
]];
2815 rollingData
[i
] = [date
, [0, 0, 0]];
2818 stddev
= den
? sigma
* Math
.sqrt(value
* (1 - value
) / den
) : 1.0;
2819 rollingData
[i
] = [date
, [mult
* value
, mult
* stddev
, mult
* stddev
]];
2822 rollingData
[i
] = [date
, mult
* value
];
2825 } else if (this.attr_("customBars")) {
2830 for (i
= 0; i
< originalData
.length
; i
++) {
2831 var data
= originalData
[i
][1];
2833 rollingData
[i
] = [originalData
[i
][0], [y
, y
- data
[0], data
[2] - y
]];
2835 if (y
!== null && !isNaN(y
)) {
2841 if (i
- rollPeriod
>= 0) {
2842 var prev
= originalData
[i
- rollPeriod
];
2843 if (prev
[1][1] !== null && !isNaN(prev
[1][1])) {
2851 rollingData
[i
] = [originalData
[i
][0], [ 1.0 * mid
/ count
,
2852 1.0 * (mid
- low
) / count
,
2853 1.0 * (high
- mid
) / count
]];
2855 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2859 // Calculate the rolling average for the first rollPeriod - 1 points where
2860 // there is not enough data to roll over the full number of points
2861 if (!this.attr_("errorBars")){
2862 if (rollPeriod
== 1) {
2863 return originalData
;
2866 for (i
= 0; i
< originalData
.length
; i
++) {
2869 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2870 y
= originalData
[j
][1];
2871 if (y
=== null || isNaN(y
)) continue;
2873 sum
+= originalData
[j
][1];
2876 rollingData
[i
] = [originalData
[i
][0], sum
/ num_ok
];
2878 rollingData
[i
] = [originalData
[i
][0], null];
2883 for (i
= 0; i
< originalData
.length
; i
++) {
2887 for (j
= Math
.max(0, i
- rollPeriod
+ 1); j
< i
+ 1; j
++) {
2888 y
= originalData
[j
][1][0];
2889 if (y
=== null || isNaN(y
)) continue;
2891 sum
+= originalData
[j
][1][0];
2892 variance
+= Math
.pow(originalData
[j
][1][1], 2);
2895 stddev
= Math
.sqrt(variance
) / num_ok
;
2896 rollingData
[i
] = [originalData
[i
][0],
2897 [sum
/ num_ok
, sigma
* stddev
, sigma
* stddev
]];
2899 rollingData
[i
] = [originalData
[i
][0], [null, null, null]];
2909 * Detects the type of the str (date or numeric) and sets the various
2910 * formatting attributes in this.attrs_ based on this type.
2911 * @param {String} str An x value.
2914 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2916 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2917 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2918 str
.indexOf('/') >= 0 ||
2919 isNaN(parseFloat(str
))) {
2921 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2922 // TODO(danvk): remove support for this format.
2926 this.setXAxisOptions_(isDate
);
2929 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2931 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2932 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2933 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2934 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2936 /** @private (shut up, jsdoc!) */
2937 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2938 // TODO(danvk): use Dygraph.numberValueFormatter here?
2939 /** @private (shut up, jsdoc!) */
2940 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2941 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2942 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2947 * Parses the value as a floating point number. This is like the parseFloat()
2948 * built-in, but with a few differences:
2949 * - the empty string is parsed as null, rather than NaN.
2950 * - if the string cannot be parsed at all, an error is logged.
2951 * If the string can't be parsed, this method returns null.
2952 * @param {String} x The string to be parsed
2953 * @param {Number} opt_line_no The line number from which the string comes.
2954 * @param {String} opt_line The text of the line from which the string comes.
2958 // Parse the x as a float or return null if it's not a number.
2959 Dygraph
.prototype.parseFloat_
= function(x
, opt_line_no
, opt_line
) {
2960 var val
= parseFloat(x
);
2961 if (!isNaN(val
)) return val
;
2963 // Try to figure out what happeend.
2964 // If the value is the empty string, parse it as null.
2965 if (/^ *$/.test(x
)) return null;
2967 // If it was actually "NaN", return it as NaN.
2968 if (/^ *nan *$/i.test(x
)) return NaN
;
2970 // Looks like a parsing error.
2971 var msg
= "Unable to parse '" + x
+ "' as a number";
2972 if (opt_line
!== null && opt_line_no
!== null) {
2973 msg
+= " on line " + (1+opt_line_no
) + " ('" + opt_line
+ "') of CSV.";
2982 * Parses a string in a special csv format. We expect a csv file where each
2983 * line is a date point, and the first field in each line is the date string.
2984 * We also expect that all remaining fields represent series.
2985 * if the errorBars attribute is set, then interpret the fields as:
2986 * date, series1, stddev1, series2, stddev2, ...
2987 * @param {[Object]} data See above.
2989 * @return [Object] An array with one entry for each row. These entries
2990 * are an array of cells in that row. The first entry is the parsed x-value for
2991 * the row. The second, third, etc. are the y-values. These can take on one of
2992 * three forms, depending on the CSV and constructor parameters:
2994 * 2. [ value, stddev ]
2995 * 3. [ low value, center value, high value ]
2997 Dygraph
.prototype.parseCSV_
= function(data
) {
2999 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3000 var lines
= data
.split(line_delimiter
|| "\n");
3003 // Use the default delimiter or fall back to a tab if that makes sense.
3004 var delim
= this.attr_('delimiter');
3005 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
3010 if (!('labels' in this.user_attrs_
)) {
3011 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
3013 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
3014 this.attributes_
.reparseSeries();
3019 var defaultParserSet
= false; // attempt to auto-detect x value type
3020 var expectedCols
= this.attr_("labels").length
;
3021 var outOfOrder
= false;
3022 for (var i
= start
; i
< lines
.length
; i
++) {
3023 var line
= lines
[i
];
3025 if (line
.length
=== 0) continue; // skip blank lines
3026 if (line
[0] == '#') continue; // skip comment lines
3027 var inFields
= line
.split(delim
);
3028 if (inFields
.length
< 2) continue;
3031 if (!defaultParserSet
) {
3032 this.detectTypeFromString_(inFields
[0]);
3033 xParser
= this.attr_("xValueParser");
3034 defaultParserSet
= true;
3036 fields
[0] = xParser(inFields
[0], this);
3038 // If fractions are expected, parse the numbers as "A/B
"
3039 if (this.fractions_) {
3040 for (j = 1; j < inFields.length; j++) {
3041 // TODO(danvk): figure out an appropriate way to flag parse errors.
3042 vals = inFields[j].split("/");
3043 if (vals.length != 2) {
3044 this.error('Expected fractional "num
/den
" values in CSV data ' +
3045 "but found a value
'" + inFields[j] + "' on line
" +
3046 (1 + i) + " ('" + line + "') which is not of
this form
.");
3049 fields[j] = [this.parseFloat_(vals[0], i, line),
3050 this.parseFloat_(vals[1], i, line)];
3053 } else if (this.attr_("errorBars
")) {
3054 // If there are error bars, values are (value, stddev) pairs
3055 if (inFields.length % 2 != 1) {
3056 this.error('Expected alternating (value, stdev.) pairs in CSV data ' +
3057 'but line ' + (1 + i) + ' has an odd number of values (' +
3058 (inFields.length - 1) + "): '" + line + "'");
3060 for (j = 1; j < inFields.length; j += 2) {
3061 fields[(j + 1) / 2] = [this.parseFloat_(inFields[j], i, line),
3062 this.parseFloat_(inFields[j + 1], i, line)];
3064 } else if (this.attr_("customBars
")) {
3065 // Bars are a low;center;high tuple
3066 for (j = 1; j < inFields.length; j++) {
3067 var val = inFields[j];
3068 if (/^ *$/.test(val)) {
3069 fields[j] = [null, null, null];
3071 vals = val.split(";");
3072 if (vals.length == 3) {
3073 fields[j] = [ this.parseFloat_(vals[0], i, line),
3074 this.parseFloat_(vals[1], i, line),
3075 this.parseFloat_(vals[2], i, line) ];
3077 this.warn('When using customBars, values must be either blank ' +
3078 'or "low
;center
;high
" tuples (got "' + val +
3079 '" on line ' + (1+i));
3084 // Values are just numbers
3085 for (j = 1; j < inFields.length; j++) {
3086 fields[j] = this.parseFloat_(inFields[j], i, line);
3089 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
3093 if (fields.length != expectedCols) {
3094 this.error("Number of columns
in line
" + i + " (" + fields.length +
3095 ") does not agree
with number of
labels (" + expectedCols +
3099 // If the user specified the 'labels' option and none of the cells of the
3100 // first row parsed correctly, then they probably double-specified the
3101 // labels. We go with the values set in the option, discard this row and
3102 // log a warning to the JS console.
3103 if (i === 0 && this.attr_('labels')) {
3104 var all_null = true;
3105 for (j = 0; all_null && j < fields.length; j++) {
3106 if (fields[j]) all_null = false;
3109 this.warn("The dygraphs
'labels' option is set
, but the first row of
" +
3110 "CSV
data ('" + line + "') appears to also contain labels
. " +
3111 "Will drop the CSV labels and
use the option labels
.");
3119 this.warn("CSV is out of order
; order it correctly to speed loading
.");
3120 ret.sort(function(a,b) { return a[0] - b[0]; });
3128 * The user has provided their data as a pre-packaged JS array. If the x values
3129 * are numeric, this is the same as dygraphs' internal format. If the x values
3130 * are dates, we need to convert them from Date objects to ms since epoch.
3131 * @param {[Object]} data
3132 * @return {[Object]} data with numeric x values.
3134 Dygraph.prototype.parseArray_ = function(data) {
3135 // Peek at the first x value to see if it's numeric.
3136 if (data.length === 0) {
3137 this.error("Can
't plot empty data set");
3140 if (data[0].length === 0) {
3141 this.error("Data set cannot contain an empty row");
3146 if (this.attr_("labels") === null) {
3147 this.warn("Using default labels. Set labels explicitly via 'labels
' " +
3148 "in the options parameter");
3149 this.attrs_.labels = [ "X" ];
3150 for (i = 1; i < data[0].length; i++) {
3151 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3153 this.attributes_.reparseSeries();
3155 var num_labels = this.attr_("labels");
3156 if (num_labels.length != data[0].length) {
3157 this.error("Mismatch between number of labels (" + num_labels +
3158 ") and number of columns in array (" + data[0].length + ")");
3163 if (Dygraph.isDateLike(data[0][0])) {
3164 // Some intelligent defaults for a date x-axis.
3165 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3166 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3167 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3169 // Assume they're all dates
.
3170 var parsedData
= Dygraph
.clone(data
);
3171 for (i
= 0; i
< data
.length
; i
++) {
3172 if (parsedData
[i
].length
=== 0) {
3173 this.error("Row " + (1 + i
) + " of data is empty");
3176 if (parsedData
[i
][0] === null ||
3177 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3178 isNaN(parsedData
[i
][0].getTime())) {
3179 this.error("x value in row " + (1 + i
) + " is not a Date");
3182 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3186 // Some intelligent defaults for a numeric x-axis.
3187 /** @private (shut up, jsdoc!) */
3188 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3189 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3190 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3196 * Parses a DataTable object from gviz.
3197 * The data is expected to have a first column that is either a date or a
3198 * number. All subsequent columns must be numbers. If there is a clear mismatch
3199 * between this.xValueParser_ and the type of the first column, it will be
3200 * fixed. Fills out rawData_.
3201 * @param {[Object]} data See above.
3204 Dygraph
.prototype.parseDataTable_
= function(data
) {
3205 var shortTextForAnnotationNum
= function(num
) {
3206 // converts [0-9]+ [A-Z][a-z]*
3207 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3208 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3209 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3210 num
= Math
.floor(num
/ 26);
3212 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3213 num
= Math
.floor((num
- 1) / 26);
3218 var cols
= data
.getNumberOfColumns();
3219 var rows
= data
.getNumberOfRows();
3221 var indepType
= data
.getColumnType(0);
3222 if (indepType
== 'date' || indepType
== 'datetime') {
3223 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3224 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3225 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3226 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3227 } else if (indepType
== 'number') {
3228 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3229 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3230 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3231 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3233 this.error("only 'date', 'datetime' and 'number' types are supported for " +
3234 "column 1 of DataTable input (Got '" + indepType
+ "')");
3238 // Array of the column indices which contain data (and not annotations).
3240 var annotationCols
= {}; // data index -> [annotation cols]
3241 var hasAnnotations
= false;
3243 for (i
= 1; i
< cols
; i
++) {
3244 var type
= data
.getColumnType(i
);
3245 if (type
== 'number') {
3247 } else if (type
== 'string' && this.attr_('displayAnnotations')) {
3248 // This is OK -- it's an annotation column.
3249 var dataIdx
= colIdx
[colIdx
.length
- 1];
3250 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3251 annotationCols
[dataIdx
] = [i
];
3253 annotationCols
[dataIdx
].push(i
);
3255 hasAnnotations
= true;
3257 this.error("Only 'number' is supported as a dependent type with Gviz." +
3258 " 'string' is only supported if displayAnnotations is true");
3262 // Read column labels
3263 // TODO(danvk): add support back for errorBars
3264 var labels
= [data
.getColumnLabel(0)];
3265 for (i
= 0; i
< colIdx
.length
; i
++) {
3266 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3267 if (this.attr_("errorBars")) i
+= 1;
3269 this.attrs_
.labels
= labels
;
3270 cols
= labels
.length
;
3273 var outOfOrder
= false;
3274 var annotations
= [];
3275 for (i
= 0; i
< rows
; i
++) {
3277 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3278 data
.getValue(i
, 0) === null) {
3279 this.warn("Ignoring row " + i
+
3280 " of DataTable because of undefined or null first column.");
3284 if (indepType
== 'date' || indepType
== 'datetime') {
3285 row
.push(data
.getValue(i
, 0).getTime());
3287 row
.push(data
.getValue(i
, 0));
3289 if (!this.attr_("errorBars")) {
3290 for (j
= 0; j
< colIdx
.length
; j
++) {
3291 var col
= colIdx
[j
];
3292 row
.push(data
.getValue(i
, col
));
3293 if (hasAnnotations
&&
3294 annotationCols
.hasOwnProperty(col
) &&
3295 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3297 ann
.series
= data
.getColumnLabel(col
);
3299 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3301 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3302 if (k
) ann
.text
+= "\n";
3303 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3305 annotations
.push(ann
);
3309 // Strip out infinities, which give dygraphs problems later on.
3310 for (j
= 0; j
< row
.length
; j
++) {
3311 if (!isFinite(row
[j
])) row
[j
] = null;
3314 for (j
= 0; j
< cols
- 1; j
++) {
3315 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3318 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3325 this.warn("DataTable is out of order; order it correctly to speed loading.");
3326 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3328 this.rawData_
= ret
;
3330 if (annotations
.length
> 0) {
3331 this.setAnnotations(annotations
, true);
3333 this.attributes_
.reparseSeries();
3337 * Get the CSV data. If it's in a function, call that function. If it's in a
3338 * file, do an XMLHttpRequest to get it.
3341 Dygraph
.prototype.start_
= function() {
3342 var data
= this.file_
;
3344 // Functions can return references of all other types.
3345 if (typeof data
== 'function') {
3349 if (Dygraph
.isArrayLike(data
)) {
3350 this.rawData_
= this.parseArray_(data
);
3352 } else if (typeof data
== 'object' &&
3353 typeof data
.getColumnRange
== 'function') {
3354 // must be a DataTable from gviz.
3355 this.parseDataTable_(data
);
3357 } else if (typeof data
== 'string') {
3358 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3359 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3360 if (line_delimiter
) {
3361 this.loadedEvent_(data
);
3363 var req
= new XMLHttpRequest();
3365 req
.onreadystatechange
= function () {
3366 if (req
.readyState
== 4) {
3367 if (req
.status
=== 200 || // Normal http
3368 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3369 caller
.loadedEvent_(req
.responseText
);
3374 req
.open("GET", data
, true);
3378 this.error("Unknown data format: " + (typeof data
));
3383 * Changes various properties of the graph. These can include:
3385 * <li>file: changes the source data for the graph</li>
3386 * <li>errorBars: changes whether the data contains stddev</li>
3389 * There's a huge variety of options that can be passed to this method. For a
3390 * full list, see http://dygraphs.com/options.html.
3392 * @param {Object} attrs The new properties and values
3393 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3394 * call to updateOptions(). If you know better, you can pass true to explicitly
3395 * block the redraw. This can be useful for chaining updateOptions() calls,
3396 * avoiding the occasional infinite loop and preventing redraws when it's not
3397 * necessary (e.g. when updating a callback).
3399 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3400 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3402 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3403 var file
= input_attrs
.file
;
3404 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3406 // TODO(danvk): this is a mess. Move these options into attr_.
3407 if ('rollPeriod' in attrs
) {
3408 this.rollPeriod_
= attrs
.rollPeriod
;
3410 if ('dateWindow' in attrs
) {
3411 this.dateWindow_
= attrs
.dateWindow
;
3412 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3413 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3416 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3417 this.zoomed_y_
= (attrs
.valueRange
!== null);
3420 // TODO(danvk): validate per-series options.
3425 // highlightCircleSize
3427 // Check if this set options will require new points.
3428 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3430 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3432 this.attributes_
.reparseSeries();
3436 if (!block_redraw
) this.start_();
3438 if (!block_redraw
) {
3439 if (requiresNewPoints
) {
3442 this.renderGraph_(false);
3449 * Returns a copy of the options with deprecated names converted into current
3450 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3451 * interested in that, they should save a copy before calling this.
3454 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3456 for (var k
in attrs
) {
3457 if (k
== 'file') continue;
3458 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3461 var set
= function(axis
, opt
, value
) {
3462 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3463 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3464 my_attrs
.axes
[axis
][opt
] = value
;
3466 var map
= function(opt
, axis
, new_opt
) {
3467 if (typeof(attrs
[opt
]) != 'undefined') {
3468 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3469 new_opt
+ " option for the " + axis
+ " axis instead. " +
3470 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3471 "(see http://dygraphs.com/per-axis.html for more information.");
3472 set(axis
, new_opt
, attrs
[opt
]);
3473 delete my_attrs
[opt
];
3477 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3478 map('xValueFormatter', 'x', 'valueFormatter');
3479 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3480 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3481 map('xTicker', 'x', 'ticker');
3482 map('yValueFormatter', 'y', 'valueFormatter');
3483 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3484 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3485 map('yTicker', 'y', 'ticker');
3490 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3491 * containing div (which has presumably changed size since the dygraph was
3492 * instantiated. If the width/height are specified, the div will be resized.
3494 * This is far more efficient than destroying and re-instantiating a
3495 * Dygraph, since it doesn't have to reparse the underlying data.
3497 * @param {Number} [width] Width (in pixels)
3498 * @param {Number} [height] Height (in pixels)
3500 Dygraph
.prototype.resize
= function(width
, height
) {
3501 if (this.resize_lock
) {
3504 this.resize_lock
= true;
3506 if ((width
=== null) != (height
=== null)) {
3507 this.warn("Dygraph.resize() should be called with zero parameters or " +
3508 "two non-NULL parameters. Pretending it was zero.");
3509 width
= height
= null;
3512 var old_width
= this.width_
;
3513 var old_height
= this.height_
;
3516 this.maindiv_
.style
.width
= width
+ "px";
3517 this.maindiv_
.style
.height
= height
+ "px";
3518 this.width_
= width
;
3519 this.height_
= height
;
3521 this.width_
= this.maindiv_
.clientWidth
;
3522 this.height_
= this.maindiv_
.clientHeight
;
3525 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3526 // TODO(danvk): there should be a clear() method.
3527 this.maindiv_
.innerHTML
= "";
3528 this.roller_
= null;
3529 this.attrs_
.labelsDiv
= null;
3530 this.createInterface_();
3531 if (this.annotations_
.length
) {
3532 // createInterface_ reset the layout, so we need to do this.
3533 this.layout_
.setAnnotations(this.annotations_
);
3535 this.createDragInterface_();
3539 this.resize_lock
= false;
3543 * Adjusts the number of points in the rolling average. Updates the graph to
3544 * reflect the new averaging period.
3545 * @param {Number} length Number of points over which to average the data.
3547 Dygraph
.prototype.adjustRoll
= function(length
) {
3548 this.rollPeriod_
= length
;
3553 * Returns a boolean array of visibility statuses.
3555 Dygraph
.prototype.visibility
= function() {
3556 // Do lazy-initialization, so that this happens after we know the number of
3558 if (!this.attr_("visibility")) {
3559 this.attrs_
.visibility
= [];
3561 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3562 while (this.attr_("visibility").length
< this.numColumns() - 1) {
3563 this.attrs_
.visibility
.push(true);
3565 return this.attr_("visibility");
3569 * Changes the visiblity of a series.
3571 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3572 var x
= this.visibility();
3573 if (num
< 0 || num
>= x
.length
) {
3574 this.warn("invalid series number in setVisibility: " + num
);
3582 * How large of an area will the dygraph render itself in?
3583 * This is used for testing.
3584 * @return A {width: w, height: h} object.
3587 Dygraph
.prototype.size
= function() {
3588 return { width
: this.width_
, height
: this.height_
};
3592 * Update the list of annotations and redraw the chart.
3593 * See dygraphs.com/annotations.html for more info on how to use annotations.
3594 * @param ann {Array} An array of annotation objects.
3595 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3597 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3598 // Only add the annotation CSS rule once we know it will be used.
3599 Dygraph
.addAnnotationRule();
3600 this.annotations_
= ann
;
3601 this.layout_
.setAnnotations(this.annotations_
);
3602 if (!suppressDraw
) {
3608 * Return the list of annotations.
3610 Dygraph
.prototype.annotations
= function() {
3611 return this.annotations_
;
3615 * Get the list of label names for this graph. The first column is the
3616 * x-axis, so the data series names start at index 1.
3618 * Returns null when labels have not yet been defined.
3620 Dygraph
.prototype.getLabels
= function() {
3621 var labels
= this.attr_("labels");
3622 return labels
? labels
.slice() : null;
3626 * Get the index of a series (column) given its name. The first column is the
3627 * x-axis, so the data series start with index 1.
3629 Dygraph
.prototype.indexFromSetName
= function(name
) {
3630 return this.setIndexByName_
[name
];
3634 * Get the internal dataset index given its name. These are numbered starting from 0,
3635 * and only count visible sets.
3638 Dygraph
.prototype.datasetIndexFromSetName_
= function(name
) {
3639 return this.datasetIndex_
[this.indexFromSetName(name
)];
3644 * Adds a default style for the annotation CSS classes to the document. This is
3645 * only executed when annotations are actually used. It is designed to only be
3646 * called once -- all calls after the first will return immediately.
3648 Dygraph
.addAnnotationRule
= function() {
3649 // TODO(danvk): move this function into plugins/annotations.js
?
3650 if (Dygraph
.addedAnnotationCSS
) return;
3652 var rule
= "border: 1px solid black; " +
3653 "background-color: white; " +
3654 "text-align: center;";
3656 var styleSheetElement
= document
.createElement("style");
3657 styleSheetElement
.type
= "text/css";
3658 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3660 // Find the first style sheet that we can access.
3661 // We may not add a rule to a style sheet from another domain for security
3662 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3663 // adds its own style sheets from google.com.
3664 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3665 if (document
.styleSheets
[i
].disabled
) continue;
3666 var mysheet
= document
.styleSheets
[i
];
3668 if (mysheet
.insertRule
) { // Firefox
3669 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3670 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3671 } else if (mysheet
.addRule
) { // IE
3672 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3674 Dygraph
.addedAnnotationCSS
= true;
3677 // Was likely a security exception.
3681 this.warn("Unable to add default annotation CSS rule; display may be off.");
3684 // Older pages may still use this name.
3685 var DateGraph
= Dygraph
;