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,ActiveXObject: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 // These have to go above the "Hack for IE" in __init__ since .ready() can be
66 // called as soon as the constructor returns. Once support for OldIE is
67 // dropped, this can go down with the rest of the initializers.
68 this.is_initial_draw_
= true;
71 if (opt_fourth_param
!== undefined
) {
72 // Old versions of dygraphs took in the series labels as a constructor
73 // parameter. This doesn't make sense anymore, but it's easy to continue
74 // to support this usage.
75 Dygraph
.warn("Using deprecated four-argument dygraph constructor");
76 this.__old_init__(div
, data
, opts
, opt_fourth_param
);
78 this.__init__(div
, data
, opts
);
82 Dygraph
.NAME
= "Dygraph";
83 Dygraph
.VERSION
= "1.0.1";
84 Dygraph
.__repr__
= function() {
85 return "[" + this.NAME
+ " " + this.VERSION
+ "]";
89 * Returns information about the Dygraph class.
91 Dygraph
.toString
= function() {
92 return this.__repr__();
95 // Various default values
96 Dygraph
.DEFAULT_ROLL_PERIOD
= 1;
97 Dygraph
.DEFAULT_WIDTH
= 480;
98 Dygraph
.DEFAULT_HEIGHT
= 320;
100 // For max 60 Hz. animation:
101 Dygraph
.ANIMATION_STEPS
= 12;
102 Dygraph
.ANIMATION_DURATION
= 200;
104 // Label constants for the labelsKMB and labelsKMG2 options.
105 // (i.e. '100000' -> '100K')
106 Dygraph
.KMB_LABELS
= [ 'K', 'M', 'B', 'T', 'Q' ];
107 Dygraph
.KMG2_BIG_LABELS
= [ 'k', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y' ];
108 Dygraph
.KMG2_SMALL_LABELS
= [ 'm', 'u', 'n', 'p', 'f', 'a', 'z', 'y' ];
110 // These are defined before DEFAULT_ATTRS so that it can refer to them.
113 * Return a string version of a number. This respects the digitsAfterDecimal
114 * and maxNumberWidth options.
115 * @param {Number} x The number to be formatted
116 * @param {Dygraph} opts An options view
117 * @param {String} name The name of the point's data series
118 * @param {Dygraph} g The dygraph object
120 Dygraph
.numberValueFormatter
= function(x
, opts
, pt
, g
) {
121 var sigFigs
= opts('sigFigs');
123 if (sigFigs
!== null) {
124 // User has opted for a fixed number of significant figures.
125 return Dygraph
.floatFormat(x
, sigFigs
);
128 var digits
= opts('digitsAfterDecimal');
129 var maxNumberWidth
= opts('maxNumberWidth');
131 var kmb
= opts('labelsKMB');
132 var kmg2
= opts('labelsKMG2');
136 // switch to scientific notation if we underflow or overflow fixed display.
138 (Math
.abs(x
) >= Math
.pow(10, maxNumberWidth
) ||
139 Math
.abs(x
) < Math
.pow(10, -digits
))) {
140 label
= x
.toExponential(digits
);
142 label
= '' + Dygraph
.round_(x
, digits
);
151 k_labels
= Dygraph
.KMB_LABELS
;
154 if (kmb
) Dygraph
.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
156 k_labels
= Dygraph
.KMG2_BIG_LABELS
;
157 m_labels
= Dygraph
.KMG2_SMALL_LABELS
;
160 var absx
= Math
.abs(x
);
161 var n
= Dygraph
.pow(k
, k_labels
.length
);
162 for (var j
= k_labels
.length
- 1; j
>= 0; j
--, n
/= k
) {
164 label
= Dygraph
.round_(x
/ n
, digits
) + k_labels
[j
];
169 // TODO(danvk): clean up this logic. Why so different than kmb?
170 var x_parts
= String(x
.toExponential()).split('e-');
171 if (x_parts
.length
=== 2 && x_parts
[1] >= 3 && x_parts
[1] <= 24) {
172 if (x_parts
[1] % 3 > 0) {
173 label
= Dygraph
.round_(x_parts
[0] /
174 Dygraph
.pow(10, (x_parts
[1] % 3)),
177 label
= Number(x_parts
[0]).toFixed(2);
179 label
+= m_labels
[Math
.floor(x_parts
[1] / 3) - 1];
188 * variant for use as an axisLabelFormatter.
191 Dygraph
.numberAxisLabelFormatter
= function(x
, granularity
, opts
, g
) {
192 return Dygraph
.numberValueFormatter(x
, opts
, g
);
196 * @type {!Array.<string>}
200 Dygraph
.SHORT_MONTH_NAMES_
= ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
204 * Convert a JS date to a string appropriate to display on an axis that
205 * is displaying values at the stated granularity.
206 * @param {Date} date The date to format
207 * @param {Number} granularity One of the Dygraph granularity constants
208 * @return {String} The formatted date
211 Dygraph
.dateAxisFormatter
= function(date
, granularity
) {
212 if (granularity
>= Dygraph
.DECADAL
) {
213 return '' + date
.getFullYear();
214 } else if (granularity
>= Dygraph
.MONTHLY
) {
215 return Dygraph
.SHORT_MONTH_NAMES_
[date
.getMonth()] + ' ' + date
.getFullYear();
217 var frac
= date
.getHours() * 3600 + date
.getMinutes() * 60 + date
.getSeconds() + date
.getMilliseconds();
218 if (frac
=== 0 || granularity
>= Dygraph
.DAILY
) {
219 // e.g. '21Jan' (%d%b)
220 var nd
= new Date(date
.getTime() + 3600*1000);
221 return Dygraph
.zeropad(nd
.getDate()) + Dygraph
.SHORT_MONTH_NAMES_
[nd
.getMonth()];
223 return Dygraph
.hmsString_(date
.getTime());
229 * Standard plotters. These may be used by clients.
230 * Available plotters are:
231 * - Dygraph.Plotters.linePlotter: draws central lines (most common)
232 * - Dygraph.Plotters.errorPlotter: draws error bars
233 * - Dygraph.Plotters.fillPlotter: draws fills under lines (used with fillGraph)
235 * By default, the plotter is [fillPlotter, errorPlotter, linePlotter].
236 * This causes all the lines to be drawn over all the fills/error bars.
238 Dygraph
.Plotters
= DygraphCanvasRenderer
._Plotters
;
241 // Default attribute values.
242 Dygraph
.DEFAULT_ATTRS
= {
243 highlightCircleSize
: 3,
244 highlightSeriesOpts
: null,
245 highlightSeriesBackgroundAlpha
: 0.5,
249 // TODO(danvk): move defaults from createStatusMessage_ here.
251 labelsSeparateLines
: false,
252 labelsShowZeroValues
: true,
255 showLabelsOnHighlight
: true,
257 digitsAfterDecimal
: 2,
262 strokeBorderWidth
: 0,
263 strokeBorderColor
: "white",
266 axisLabelFontSize
: 14,
272 xValueParser
: Dygraph
.dateParser
,
279 wilsonInterval
: true, // only relevant if fractions is true
283 connectSeparatedPoints
: false,
286 stackedGraphNaNFill
: 'all',
287 hideOverlayOnMouseOut
: true,
289 // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms.
290 legend
: 'onmouseover', // the only relevant value at the moment is 'always'.
296 drawAxesAtZero
: false,
298 // Sizes of the various chart labels.
305 axisLineColor
: "black",
308 axisLabelColor
: "black",
309 axisLabelFont
: "Arial", // TODO(danvk): is this implemented?
313 gridLineColor
: "rgb(128,128,128)",
315 interactionModel
: null, // will be set to Dygraph.Interaction.defaultModel
316 animatedZooms
: false, // (for now)
318 // Range selector options
319 showRangeSelector
: false,
320 rangeSelectorHeight
: 40,
321 rangeSelectorPlotStrokeColor
: "#808FAB",
322 rangeSelectorPlotFillColor
: "#A7B1C4",
324 // The ordering here ensures that central lines always appear above any
325 // fill bars/error bars
.
327 Dygraph
.Plotters
.fillPlotter
,
328 Dygraph
.Plotters
.errorPlotter
,
329 Dygraph
.Plotters
.linePlotter
338 axisLabelFormatter
: Dygraph
.dateAxisFormatter
,
339 valueFormatter
: Dygraph
.dateString_
,
342 independentTicks
: true,
343 ticker
: null // will be set in dygraph-tickers.js
347 valueFormatter
: Dygraph
.numberValueFormatter
,
348 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
351 independentTicks
: true,
352 ticker
: null // will be set in dygraph-tickers.js
356 valueFormatter
: Dygraph
.numberValueFormatter
,
357 axisLabelFormatter
: Dygraph
.numberAxisLabelFormatter
,
360 independentTicks
: false,
361 ticker
: null // will be set in dygraph-tickers.js
366 // Directions for panning and zooming. Use bit operations when combined
367 // values are possible.
368 Dygraph
.HORIZONTAL
= 1;
369 Dygraph
.VERTICAL
= 2;
371 // Installed plugins, in order of precedence (most-general to most-specific).
372 // Plugins are installed after they are defined, in plugins/install.js
.
376 // Used for initializing annotation CSS rules only once.
377 Dygraph
.addedAnnotationCSS
= false;
379 Dygraph
.prototype.__old_init__
= function(div
, file
, labels
, attrs
) {
380 // Labels is no longer a constructor parameter, since it's typically set
381 // directly from the data source. It also conains a name for the x-axis,
382 // which the previous constructor form did not.
383 if (labels
!== null) {
384 var new_labels
= ["Date"];
385 for (var i
= 0; i
< labels
.length
; i
++) new_labels
.push(labels
[i
]);
386 Dygraph
.update(attrs
, { 'labels': new_labels
});
388 this.__init__(div
, file
, attrs
);
392 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
393 * and context <canvas> inside of it. See the constructor for details.
395 * @param {Element} div the Element to render the graph into.
396 * @param {String | Function} file Source data
397 * @param {Object} attrs Miscellaneous other options
400 Dygraph
.prototype.__init__
= function(div
, file
, attrs
) {
401 // Hack for IE: if we're using excanvas and the document hasn't finished
402 // loading yet (and hence may not have initialized whatever it needs to
403 // initialize), then keep calling this routine periodically until it has.
404 if (/MSIE/.test(navigator
.userAgent
) && !window
.opera
&&
405 typeof(G_vmlCanvasManager
) != 'undefined' &&
406 document
.readyState
!= 'complete') {
408 setTimeout(function() { self
.__init__(div
, file
, attrs
); }, 100);
412 // Support two-argument constructor
413 if (attrs
=== null || attrs
=== undefined
) { attrs
= {}; }
415 attrs
= Dygraph
.mapLegacyOptions_(attrs
);
417 if (typeof(div
) == 'string') {
418 div
= document
.getElementById(div
);
422 Dygraph
.error("Constructing dygraph with a non-existent div!");
426 this.isUsingExcanvas_
= typeof(G_vmlCanvasManager
) != 'undefined';
428 // Copy the important bits into the object
429 // TODO(danvk): most of these should just stay in the attrs_ dictionary.
432 this.rollPeriod_
= attrs
.rollPeriod
|| Dygraph
.DEFAULT_ROLL_PERIOD
;
433 this.previousVerticalX_
= -1;
434 this.fractions_
= attrs
.fractions
|| false;
435 this.dateWindow_
= attrs
.dateWindow
|| null;
437 this.annotations_
= [];
439 // Zoomed indicators - These indicate when the graph has been zoomed and on what axis.
440 this.zoomed_x_
= false;
441 this.zoomed_y_
= false;
443 // Clear the div. This ensure that, if multiple dygraphs are passed the same
444 // div, then only one will be drawn.
447 // For historical reasons, the 'width' and 'height' options trump all CSS
448 // rules _except_ for an explicit 'width' or 'height' on the div.
449 // As an added convenience, if the div has zero height (like <div></div> does
450 // without any styles), then we use a default height/width
.
451 if (div
.style
.width
=== '' && attrs
.width
) {
452 div
.style
.width
= attrs
.width
+ "px";
454 if (div
.style
.height
=== '' && attrs
.height
) {
455 div
.style
.height
= attrs
.height
+ "px";
457 if (div
.style
.height
=== '' && div
.clientHeight
=== 0) {
458 div
.style
.height
= Dygraph
.DEFAULT_HEIGHT
+ "px";
459 if (div
.style
.width
=== '') {
460 div
.style
.width
= Dygraph
.DEFAULT_WIDTH
+ "px";
463 // These will be zero if the dygraph's div is hidden. In that case,
464 // use the user-specified attributes if present. If not, use zero
465 // and assume the user will call resize to fix things later.
466 this.width_
= div
.clientWidth
|| attrs
.width
|| 0;
467 this.height_
= div
.clientHeight
|| attrs
.height
|| 0;
469 // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_.
470 if (attrs
.stackedGraph
) {
471 attrs
.fillGraph
= true;
472 // TODO(nikhilk): Add any other stackedGraph checks here.
475 // DEPRECATION WARNING: All option processing should be moved from
476 // attrs_ and user_attrs_ to options_, which holds all this information.
478 // Dygraphs has many options, some of which interact with one another.
479 // To keep track of everything, we maintain two sets of options:
481 // this.user_attrs_ only options explicitly set by the user.
482 // this.attrs_ defaults, options derived from user_attrs_, data.
484 // Options are then accessed this.attr_('attr'), which first looks at
485 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
486 // defaults without overriding behavior that the user specifically asks for.
487 this.user_attrs_
= {};
488 Dygraph
.update(this.user_attrs_
, attrs
);
490 // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified.
492 Dygraph
.updateDeep(this.attrs_
, Dygraph
.DEFAULT_ATTRS
);
494 this.boundaryIds_
= [];
495 this.setIndexByName_
= {};
496 this.datasetIndex_
= [];
498 this.registeredEvents_
= [];
499 this.eventListeners_
= {};
501 this.attributes_
= new DygraphOptions(this);
503 // Create the containing DIV and other interactive elements
504 this.createInterface_();
508 var plugins
= Dygraph
.PLUGINS
.concat(this.getOption('plugins'));
509 for (var i
= 0; i
< plugins
.length
; i
++) {
510 var Plugin
= plugins
[i
];
511 var pluginInstance
= new Plugin();
513 plugin
: pluginInstance
,
519 var handlers
= pluginInstance
.activate(this);
520 for (var eventName
in handlers
) {
521 // TODO(danvk): validate eventName.
522 pluginDict
.events
[eventName
] = handlers
[eventName
];
525 this.plugins_
.push(pluginDict
);
528 // At this point, plugins can no longer register event handlers.
529 // Construct a map from event -> ordered list of [callback, plugin].
530 for (var i
= 0; i
< this.plugins_
.length
; i
++) {
531 var plugin_dict
= this.plugins_
[i
];
532 for (var eventName
in plugin_dict
.events
) {
533 if (!plugin_dict
.events
.hasOwnProperty(eventName
)) continue;
534 var callback
= plugin_dict
.events
[eventName
];
536 var pair
= [plugin_dict
.plugin
, callback
];
537 if (!(eventName
in this.eventListeners_
)) {
538 this.eventListeners_
[eventName
] = [pair
];
540 this.eventListeners_
[eventName
].push(pair
);
545 this.createDragInterface_();
551 * Triggers a cascade of events to the various plugins which are interested in them.
552 * Returns true if the "default behavior" should be performed, i.e. if none of
553 * the event listeners called event.preventDefault().
556 Dygraph
.prototype.cascadeEvents_
= function(name
, extra_props
) {
557 if (!(name
in this.eventListeners_
)) return true;
559 // QUESTION: can we use objects & prototypes to speed this up?
563 defaultPrevented
: false,
564 preventDefault
: function() {
565 if (!e
.cancelable
) throw "Cannot call preventDefault on non-cancelable event.";
566 e
.defaultPrevented
= true;
568 propagationStopped
: false,
569 stopPropagation
: function() {
570 e
.propagationStopped
= true;
573 Dygraph
.update(e
, extra_props
);
575 var callback_plugin_pairs
= this.eventListeners_
[name
];
576 if (callback_plugin_pairs
) {
577 for (var i
= callback_plugin_pairs
.length
- 1; i
>= 0; i
--) {
578 var plugin
= callback_plugin_pairs
[i
][0];
579 var callback
= callback_plugin_pairs
[i
][1];
580 callback
.call(plugin
, e
);
581 if (e
.propagationStopped
) break;
584 return e
.defaultPrevented
;
588 * Returns the zoomed status of the chart for one or both axes.
590 * Axis is an optional parameter. Can be set to 'x' or 'y'.
592 * The zoomed status for an axis is set whenever a user zooms using the mouse
593 * or when the dateWindow or valueRange are updated (unless the
594 * isZoomedIgnoreProgrammaticZoom option is also specified).
596 Dygraph
.prototype.isZoomed
= function(axis
) {
597 if (axis
=== null || axis
=== undefined
) {
598 return this.zoomed_x_
|| this.zoomed_y_
;
600 if (axis
=== 'x') return this.zoomed_x_
;
601 if (axis
=== 'y') return this.zoomed_y_
;
602 throw "axis parameter is [" + axis
+ "] must be null, 'x' or 'y'.";
606 * Returns information about the Dygraph object, including its containing ID.
608 Dygraph
.prototype.toString
= function() {
609 var maindiv
= this.maindiv_
;
610 var id
= (maindiv
&& maindiv
.id
) ? maindiv
.id
: maindiv
;
611 return "[Dygraph " + id
+ "]";
616 * Returns the value of an option. This may be set by the user (either in the
617 * constructor or by calling updateOptions) or by dygraphs, and may be set to a
619 * @param { String } name The name of the option, e.g. 'rollPeriod'.
620 * @param { String } [seriesName] The name of the series to which the option
621 * will be applied. If no per-series value of this option is available, then
622 * the global value is returned. This is optional.
623 * @return { ... } The value of the option.
625 Dygraph
.prototype.attr_
= function(name
, seriesName
) {
626 // <REMOVE_FOR_COMBINED>
627 if (typeof(Dygraph
.OPTIONS_REFERENCE
) === 'undefined') {
628 Dygraph
.error('Must include options reference JS for testing');
629 } else if (!Dygraph
.OPTIONS_REFERENCE
.hasOwnProperty(name
)) {
630 Dygraph
.error('Dygraphs is using property ' + name
+ ', which has no ' +
631 'entry in the Dygraphs.OPTIONS_REFERENCE listing.');
632 // Only log this error once.
633 Dygraph
.OPTIONS_REFERENCE
[name
] = true;
635 // </REMOVE_FOR_COMBINED
>
636 return seriesName
? this.attributes_
.getForSeries(name
, seriesName
) : this.attributes_
.get(name
);
640 * Returns the current value for an option, as set in the constructor or via
641 * updateOptions. You may pass in an (optional) series name to get per-series
642 * values for the option.
644 * All values returned by this method should be considered immutable. If you
645 * modify them, there is no guarantee that the changes will be honored or that
646 * dygraphs will remain in a consistent state. If you want to modify an option,
647 * use updateOptions() instead.
649 * @param { String } name The name of the option (e.g. 'strokeWidth')
650 * @param { String } [opt_seriesName] Series name to get per-series values.
651 * @return { ... } The value of the option.
653 Dygraph
.prototype.getOption
= function(name
, opt_seriesName
) {
654 return this.attr_(name
, opt_seriesName
);
658 * Like getOption(), but specifically returns a number.
659 * This is a convenience function for working with the Closure Compiler.
660 * @param {string} name The name of the option (e.g. 'strokeWidth')
661 * @param {string=} opt_seriesName Series name to get per-series values.
662 * @return {number} The value of the option.
665 Dygraph
.prototype.getNumericOption
= function(name
, opt_seriesName
) {
666 return /** @type{number} */(this.getOption(name
, opt_seriesName
));
670 * Like getOption(), but specifically returns a string.
671 * This is a convenience function for working with the Closure Compiler.
672 * @param {string} name The name of the option (e.g. 'strokeWidth')
673 * @param {string=} opt_seriesName Series name to get per-series values.
674 * @return {string} The value of the option.
677 Dygraph
.prototype.getStringOption
= function(name
, opt_seriesName
) {
678 return /** @type{string} */(this.getOption(name
, opt_seriesName
));
682 * Like getOption(), but specifically returns a boolean.
683 * This is a convenience function for working with the Closure Compiler.
684 * @param {string} name The name of the option (e.g. 'strokeWidth')
685 * @param {string=} opt_seriesName Series name to get per-series values.
686 * @return {boolean} The value of the option.
689 Dygraph
.prototype.getBooleanOption
= function(name
, opt_seriesName
) {
690 return /** @type{boolean} */(this.getOption(name
, opt_seriesName
));
694 * Like getOption(), but specifically returns a function.
695 * This is a convenience function for working with the Closure Compiler.
696 * @param {string} name The name of the option (e.g. 'strokeWidth')
697 * @param {string=} opt_seriesName Series name to get per-series values.
698 * @return {function(...)} The value of the option.
701 Dygraph
.prototype.getFunctionOption
= function(name
, opt_seriesName
) {
702 return /** @type{function(...)} */(this.getOption(name
, opt_seriesName
));
705 Dygraph
.prototype.getOptionForAxis
= function(name
, axis
) {
706 return this.attributes_
.getForAxis(name
, axis
);
711 * @param {string} axis The name of the axis (i.e. 'x', 'y' or 'y2')
712 * @return { ... } A function mapping string -> option value
714 Dygraph
.prototype.optionsViewForAxis_
= function(axis
) {
716 return function(opt
) {
717 var axis_opts
= self
.user_attrs_
.axes
;
718 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
].hasOwnProperty(opt
)) {
719 return axis_opts
[axis
][opt
];
721 // user-specified attributes always trump defaults, even if they're less
723 if (typeof(self
.user_attrs_
[opt
]) != 'undefined') {
724 return self
.user_attrs_
[opt
];
727 axis_opts
= self
.attrs_
.axes
;
728 if (axis_opts
&& axis_opts
[axis
] && axis_opts
[axis
].hasOwnProperty(opt
)) {
729 return axis_opts
[axis
][opt
];
731 // check old-style axis options
732 // TODO(danvk): add a deprecation warning if either of these match.
733 if (axis
== 'y' && self
.axes_
[0].hasOwnProperty(opt
)) {
734 return self
.axes_
[0][opt
];
735 } else if (axis
== 'y2' && self
.axes_
[1].hasOwnProperty(opt
)) {
736 return self
.axes_
[1][opt
];
738 return self
.attr_(opt
);
743 * Returns the current rolling period, as set by the user or an option.
744 * @return {Number} The number of points in the rolling window
746 Dygraph
.prototype.rollPeriod
= function() {
747 return this.rollPeriod_
;
751 * Returns the currently-visible x-range. This can be affected by zooming,
752 * panning or a call to updateOptions.
753 * Returns a two-element array: [left, right].
754 * If the Dygraph has dates on the x-axis, these will be millis since epoch.
756 Dygraph
.prototype.xAxisRange
= function() {
757 return this.dateWindow_
? this.dateWindow_
: this.xAxisExtremes();
761 * Returns the lower- and upper-bound x-axis values of the
764 Dygraph
.prototype.xAxisExtremes
= function() {
765 var pad
= this.getNumericOption('xRangePad') / this.plotter_
.area
.w
;
766 if (this.numRows() === 0) {
767 return [0 - pad
, 1 + pad
];
769 var left
= this.rawData_
[0][0];
770 var right
= this.rawData_
[this.rawData_
.length
- 1][0];
772 // Must keep this in sync with dygraph-layout _evaluateLimits()
773 var range
= right
- left
;
775 right
+= range
* pad
;
777 return [left
, right
];
781 * Returns the currently-visible y-range for an axis. This can be affected by
782 * zooming, panning or a call to updateOptions. Axis indices are zero-based. If
783 * called with no arguments, returns the range of the first axis.
784 * Returns a two-element array: [bottom, top].
786 Dygraph
.prototype.yAxisRange
= function(idx
) {
787 if (typeof(idx
) == "undefined") idx
= 0;
788 if (idx
< 0 || idx
>= this.axes_
.length
) {
791 var axis
= this.axes_
[idx
];
792 return [ axis
.computedValueRange
[0], axis
.computedValueRange
[1] ];
796 * Returns the currently-visible y-ranges for each axis. This can be affected by
797 * zooming, panning, calls to updateOptions, etc.
798 * Returns an array of [bottom, top] pairs, one for each y-axis.
800 Dygraph
.prototype.yAxisRanges
= function() {
802 for (var i
= 0; i
< this.axes_
.length
; i
++) {
803 ret
.push(this.yAxisRange(i
));
808 // TODO(danvk): use these functions throughout dygraphs.
810 * Convert from data coordinates to canvas/div X/Y coordinates.
811 * If specified, do this conversion for the coordinate system of a particular
812 * axis. Uses the first axis by default.
813 * Returns a two-element array: [X, Y]
815 * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord
816 * instead of toDomCoords(null, y, axis).
818 Dygraph
.prototype.toDomCoords
= function(x
, y
, axis
) {
819 return [ this.toDomXCoord(x
), this.toDomYCoord(y
, axis
) ];
823 * Convert from data x coordinates to canvas/div X coordinate.
824 * If specified, do this conversion for the coordinate system of a particular
826 * Returns a single value or null if x is null.
828 Dygraph
.prototype.toDomXCoord
= function(x
) {
833 var area
= this.plotter_
.area
;
834 var xRange
= this.xAxisRange();
835 return area
.x
+ (x
- xRange
[0]) / (xRange
[1] - xRange
[0]) * area
.w
;
839 * Convert from data x coordinates to canvas/div Y coordinate and optional
840 * axis. Uses the first axis by default.
842 * returns a single value or null if y is null.
844 Dygraph
.prototype.toDomYCoord
= function(y
, axis
) {
845 var pct
= this.toPercentYCoord(y
, axis
);
850 var area
= this.plotter_
.area
;
851 return area
.y
+ pct
* area
.h
;
855 * Convert from canvas/div coords to data coordinates.
856 * If specified, do this conversion for the coordinate system of a particular
857 * axis. Uses the first axis by default.
858 * Returns a two-element array: [X, Y].
860 * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord
861 * instead of toDataCoords(null, y, axis).
863 Dygraph
.prototype.toDataCoords
= function(x
, y
, axis
) {
864 return [ this.toDataXCoord(x
), this.toDataYCoord(y
, axis
) ];
868 * Convert from canvas/div x coordinate to data coordinate.
870 * If x is null, this returns null.
872 Dygraph
.prototype.toDataXCoord
= function(x
) {
877 var area
= this.plotter_
.area
;
878 var xRange
= this.xAxisRange();
879 return xRange
[0] + (x
- area
.x
) / area
.w
* (xRange
[1] - xRange
[0]);
883 * Convert from canvas/div y coord to value.
885 * If y is null, this returns null.
886 * if axis is null, this uses the first axis.
888 Dygraph
.prototype.toDataYCoord
= function(y
, axis
) {
893 var area
= this.plotter_
.area
;
894 var yRange
= this.yAxisRange(axis
);
896 if (typeof(axis
) == "undefined") axis
= 0;
897 if (!this.attributes_
.getForAxis("logscale", axis
)) {
898 return yRange
[0] + (area
.y
+ area
.h
- y
) / area
.h
* (yRange
[1] - yRange
[0]);
900 // Computing the inverse of toDomCoord.
901 var pct
= (y
- area
.y
) / area
.h
;
903 // Computing the inverse of toPercentYCoord. The function was arrived at with
904 // the following steps:
906 // Original calcuation:
907 // pct = (logr1 - Dygraph.log10(y)) / (logr1
- Dygraph
.log10(yRange
[0]));
909 // Move denominator to both sides:
910 // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y);
912 // subtract logr1, and take the negative value.
913 // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y);
915 // Swap both sides of the equation, and we can compute the log of the
916 // return value. Which means we just need to use that as the exponent in
918 // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0])));
920 var logr1
= Dygraph
.log10(yRange
[1]);
921 var exponent
= logr1
- (pct
* (logr1
- Dygraph
.log10(yRange
[0])));
922 var value
= Math
.pow(Dygraph
.LOG_SCALE
, exponent
);
928 * Converts a y for an axis to a percentage from the top to the
929 * bottom of the drawing area.
931 * If the coordinate represents a value visible on the canvas, then
932 * the value will be between 0 and 1, where 0 is the top of the canvas.
933 * However, this method will return values outside the range, as
934 * values can fall outside the canvas.
936 * If y is null, this returns null.
937 * if axis is null, this uses the first axis.
939 * @param { Number } y The data y-coordinate.
940 * @param { Number } [axis] The axis number on which the data coordinate lives.
941 * @return { Number } A fraction in [0, 1] where 0 = the top edge.
943 Dygraph
.prototype.toPercentYCoord
= function(y
, axis
) {
947 if (typeof(axis
) == "undefined") axis
= 0;
949 var yRange
= this.yAxisRange(axis
);
952 var logscale
= this.attributes_
.getForAxis("logscale", axis
);
954 // yRange[1] - y is unit distance from the bottom.
955 // yRange[1] - yRange[0] is the scale of the range.
956 // (yRange[1] - y) / (yRange
[1] - yRange
[0]) is the
% from the bottom
.
957 pct
= (yRange
[1] - y
) / (yRange
[1] - yRange
[0]);
959 var logr1
= Dygraph
.log10(yRange
[1]);
960 pct
= (logr1
- Dygraph
.log10(y
)) / (logr1
- Dygraph
.log10(yRange
[0]));
966 * Converts an x value to a percentage from the left to the right of
969 * If the coordinate represents a value visible on the canvas, then
970 * the value will be between 0 and 1, where 0 is the left of the canvas.
971 * However, this method will return values outside the range, as
972 * values can fall outside the canvas.
974 * If x is null, this returns null.
975 * @param { Number } x The data x-coordinate.
976 * @return { Number } A fraction in [0, 1] where 0 = the left edge.
978 Dygraph
.prototype.toPercentXCoord
= function(x
) {
983 var xRange
= this.xAxisRange();
984 return (x
- xRange
[0]) / (xRange
[1] - xRange
[0]);
988 * Returns the number of columns (including the independent variable).
989 * @return { Integer } The number of columns.
991 Dygraph
.prototype.numColumns
= function() {
992 if (!this.rawData_
) return 0;
993 return this.rawData_
[0] ? this.rawData_
[0].length
: this.attr_("labels").length
;
997 * Returns the number of rows (excluding any header/label row).
998 * @return { Integer } The number of rows, less any header.
1000 Dygraph
.prototype.numRows
= function() {
1001 if (!this.rawData_
) return 0;
1002 return this.rawData_
.length
;
1006 * Returns the value in the given row and column. If the row and column exceed
1007 * the bounds on the data, returns null. Also returns null if the value is
1009 * @param { Number} row The row number of the data (0-based). Row 0 is the
1010 * first row of data, not a header row.
1011 * @param { Number} col The column number of the data (0-based)
1012 * @return { Number } The value in the specified cell or null if the row/col
1013 * were out of range.
1015 Dygraph
.prototype.getValue
= function(row
, col
) {
1016 if (row
< 0 || row
> this.rawData_
.length
) return null;
1017 if (col
< 0 || col
> this.rawData_
[row
].length
) return null;
1019 return this.rawData_
[row
][col
];
1023 * Generates interface elements for the Dygraph: a containing div, a div to
1024 * display the current point, and a textbox to adjust the rolling average
1025 * period. Also creates the Renderer/Layout elements.
1028 Dygraph
.prototype.createInterface_
= function() {
1029 // Create the all-enclosing graph div
1030 var enclosing
= this.maindiv_
;
1032 this.graphDiv
= document
.createElement("div");
1034 // TODO(danvk): any other styles that are useful to set here?
1035 this.graphDiv
.style
.textAlign
= 'left'; // This is a CSS "reset"
1036 enclosing
.appendChild(this.graphDiv
);
1038 // Create the canvas for interactive parts of the chart.
1039 this.canvas_
= Dygraph
.createCanvas();
1040 this.canvas_
.style
.position
= "absolute";
1042 // ... and for static parts of the chart.
1043 this.hidden_
= this.createPlotKitCanvas_(this.canvas_
);
1045 this.resizeElements_();
1047 this.canvas_ctx_
= Dygraph
.getContext(this.canvas_
);
1048 this.hidden_ctx_
= Dygraph
.getContext(this.hidden_
);
1050 // The interactive parts of the graph are drawn on top of the chart.
1051 this.graphDiv
.appendChild(this.hidden_
);
1052 this.graphDiv
.appendChild(this.canvas_
);
1053 this.mouseEventElement_
= this.createMouseEventElement_();
1055 // Create the grapher
1056 this.layout_
= new DygraphLayout(this);
1060 this.mouseMoveHandler_
= function(e
) {
1061 dygraph
.mouseMove_(e
);
1064 this.mouseOutHandler_
= function(e
) {
1065 // The mouse has left the chart if:
1066 // 1. e.target is inside the chart
1067 // 2. e.relatedTarget is outside the chart
1068 var target
= e
.target
|| e
.fromElement
;
1069 var relatedTarget
= e
.relatedTarget
|| e
.toElement
;
1070 if (Dygraph
.isNodeContainedBy(target
, dygraph
.graphDiv
) &&
1071 !Dygraph
.isNodeContainedBy(relatedTarget
, dygraph
.graphDiv
)) {
1072 dygraph
.mouseOut_(e
);
1076 this.addAndTrackEvent(window
, 'mouseout', this.mouseOutHandler_
);
1077 this.addAndTrackEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler_
);
1079 // Don't recreate and register the resize handler on subsequent calls.
1080 // This happens when the graph is resized.
1081 if (!this.resizeHandler_
) {
1082 this.resizeHandler_
= function(e
) {
1086 // Update when the window is resized.
1087 // TODO(danvk): drop frames depending on complexity of the chart.
1088 this.addAndTrackEvent(window
, 'resize', this.resizeHandler_
);
1092 Dygraph
.prototype.resizeElements_
= function() {
1093 this.graphDiv
.style
.width
= this.width_
+ "px";
1094 this.graphDiv
.style
.height
= this.height_
+ "px";
1095 this.canvas_
.width
= this.width_
;
1096 this.canvas_
.height
= this.height_
;
1097 this.canvas_
.style
.width
= this.width_
+ "px"; // for IE
1098 this.canvas_
.style
.height
= this.height_
+ "px"; // for IE
1099 this.hidden_
.width
= this.width_
;
1100 this.hidden_
.height
= this.height_
;
1101 this.hidden_
.style
.width
= this.width_
+ "px"; // for IE
1102 this.hidden_
.style
.height
= this.height_
+ "px"; // for IE
1106 * Detach DOM elements in the dygraph and null out all data references.
1107 * Calling this when you're done with a dygraph can dramatically reduce memory
1108 * usage. See, e.g., the tests/perf.html example.
1110 Dygraph
.prototype.destroy
= function() {
1111 this.canvas_ctx_
.restore();
1112 this.hidden_ctx_
.restore();
1114 var removeRecursive
= function(node
) {
1115 while (node
.hasChildNodes()) {
1116 removeRecursive(node
.firstChild
);
1117 node
.removeChild(node
.firstChild
);
1121 this.removeTrackedEvents_();
1123 // remove mouse event handlers (This may not be necessary anymore)
1124 Dygraph
.removeEvent(window
, 'mouseout', this.mouseOutHandler_
);
1125 Dygraph
.removeEvent(this.mouseEventElement_
, 'mousemove', this.mouseMoveHandler_
);
1127 // remove window handlers
1128 Dygraph
.removeEvent(window
,'resize',this.resizeHandler_
);
1129 this.resizeHandler_
= null;
1131 removeRecursive(this.maindiv_
);
1133 var nullOut
= function(obj
) {
1134 for (var n
in obj
) {
1135 if (typeof(obj
[n
]) === 'object') {
1140 // These may not all be necessary, but it can't hurt...
1141 nullOut(this.layout_
);
1142 nullOut(this.plotter_
);
1147 * Creates the canvas on which the chart will be drawn. Only the Renderer ever
1148 * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots
1149 * or the zoom rectangles) is done on this.canvas_.
1150 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
1151 * @return {Object} The newly-created canvas
1154 Dygraph
.prototype.createPlotKitCanvas_
= function(canvas
) {
1155 var h
= Dygraph
.createCanvas();
1156 h
.style
.position
= "absolute";
1157 // TODO(danvk): h should be offset from canvas. canvas needs to include
1158 // some extra area to make it easier to zoom in on the far left and far
1159 // right. h needs to be precisely the plot area, so that clipping occurs.
1160 h
.style
.top
= canvas
.style
.top
;
1161 h
.style
.left
= canvas
.style
.left
;
1162 h
.width
= this.width_
;
1163 h
.height
= this.height_
;
1164 h
.style
.width
= this.width_
+ "px"; // for IE
1165 h
.style
.height
= this.height_
+ "px"; // for IE
1170 * Creates an overlay element used to handle mouse events.
1171 * @return {Object} The mouse event element.
1174 Dygraph
.prototype.createMouseEventElement_
= function() {
1175 if (this.isUsingExcanvas_
) {
1176 var elem
= document
.createElement("div");
1177 elem
.style
.position
= 'absolute';
1178 elem
.style
.backgroundColor
= 'white';
1179 elem
.style
.filter
= 'alpha(opacity=0)';
1180 elem
.style
.width
= this.width_
+ "px";
1181 elem
.style
.height
= this.height_
+ "px";
1182 this.graphDiv
.appendChild(elem
);
1185 return this.canvas_
;
1190 * Generate a set of distinct colors for the data series. This is done with a
1191 * color wheel. Saturation/Value are customizable, and the hue is
1192 * equally-spaced around the color wheel. If a custom set of colors is
1193 * specified, that is used instead.
1196 Dygraph
.prototype.setColors_
= function() {
1197 var labels
= this.getLabels();
1198 var num
= labels
.length
- 1;
1200 this.colorsMap_
= {};
1202 // These are used for when no custom colors are specified.
1203 var sat
= this.getNumericOption('colorSaturation') || 1.0;
1204 var val
= this.getNumericOption('colorValue') || 0.5;
1205 var half
= Math
.ceil(num
/ 2);
1207 var colors
= this.getOption('colors');
1208 var visibility
= this.visibility();
1209 for (var i
= 0; i
< num
; i
++) {
1210 if (!visibility
[i
]) {
1213 var label
= labels
[i
+ 1];
1214 var colorStr
= this.attributes_
.getForSeries('color', label
);
1217 colorStr
= colors
[i
% colors
.length
];
1219 // alternate colors for high contrast.
1220 var idx
= i
% 2 ? (half
+ (i
+ 1)/ 2) : Math.ceil((i + 1) / 2);
1221 var hue
= (1.0 * idx
/ (1 + num
));
1222 colorStr
= Dygraph
.hsvToRGB(hue
, sat
, val
);
1225 this.colors_
.push(colorStr
);
1226 this.colorsMap_
[label
] = colorStr
;
1231 * Return the list of colors. This is either the list of colors passed in the
1232 * attributes or the autogenerated list of rgb(r,g,b) strings.
1233 * This does not return colors for invisible series.
1234 * @return {Array<string>} The list of colors.
1236 Dygraph
.prototype.getColors
= function() {
1237 return this.colors_
;
1241 * Returns a few attributes of a series, i.e. its color, its visibility, which
1242 * axis it's assigned to, and its column in the original data.
1243 * Returns null if the series does not exist.
1244 * Otherwise, returns an object with column, visibility, color and axis properties.
1245 * The "axis" property will be set to 1 for y1 and 2 for y2.
1246 * The "column" property can be fed back into getValue(row, column) to get
1247 * values for this series.
1249 Dygraph
.prototype.getPropertiesForSeries
= function(series_name
) {
1251 var labels
= this.getLabels();
1252 for (var i
= 1; i
< labels
.length
; i
++) {
1253 if (labels
[i
] == series_name
) {
1258 if (idx
== -1) return null;
1263 visible
: this.visibility()[idx
- 1],
1264 color
: this.colorsMap_
[series_name
],
1265 axis
: 1 + this.attributes_
.axisForSeries(series_name
)
1270 * Create the text box to adjust the averaging period
1273 Dygraph
.prototype.createRollInterface_
= function() {
1274 // Create a roller if one doesn't exist already.
1275 if (!this.roller_
) {
1276 this.roller_
= document
.createElement("input");
1277 this.roller_
.type
= "text";
1278 this.roller_
.style
.display
= "none";
1279 this.graphDiv
.appendChild(this.roller_
);
1282 var display
= this.getBooleanOption('showRoller') ? 'block' : 'none';
1284 var area
= this.plotter_
.area
;
1285 var textAttr
= { "position": "absolute",
1287 "top": (area
.y
+ area
.h
- 25) + "px",
1288 "left": (area
.x
+ 1) + "px",
1291 this.roller_
.size
= "2";
1292 this.roller_
.value
= this.rollPeriod_
;
1293 for (var name
in textAttr
) {
1294 if (textAttr
.hasOwnProperty(name
)) {
1295 this.roller_
.style
[name
] = textAttr
[name
];
1300 this.roller_
.onchange
= function() { dygraph
.adjustRoll(dygraph
.roller_
.value
); };
1304 * Set up all the mouse handlers needed to capture dragging behavior for zoom
1308 Dygraph
.prototype.createDragInterface_
= function() {
1310 // Tracks whether the mouse is down right now
1312 isPanning
: false, // is this drag part of a pan?
1313 is2DPan
: false, // if so, is that pan 1- or 2-dimensional?
1314 dragStartX
: null, // pixel coordinates
1315 dragStartY
: null, // pixel coordinates
1316 dragEndX
: null, // pixel coordinates
1317 dragEndY
: null, // pixel coordinates
1318 dragDirection
: null,
1319 prevEndX
: null, // pixel coordinates
1320 prevEndY
: null, // pixel coordinates
1321 prevDragDirection
: null,
1322 cancelNextDblclick
: false, // see comment in dygraph-interaction-model.js
1324 // The value on the left side of the graph when a pan operation starts.
1325 initialLeftmostDate
: null,
1327 // The number of units each pixel spans. (This won't be valid for log
1329 xUnitsPerPixel
: null,
1331 // TODO(danvk): update this comment
1332 // The range in second/value units that the viewport encompasses during a
1333 // panning operation.
1336 // Top-left corner of the canvas, in DOM coords
1337 // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY.
1341 // Values for use with panEdgeFraction, which limit how far outside the
1342 // graph's data boundaries it can be panned.
1343 boundedDates
: null, // [minDate, maxDate]
1344 boundedValues
: null, // [[minValue, maxValue] ...]
1346 // We cover iframes during mouse interactions. See comments in
1347 // dygraph-utils.js for more info on why this is a good idea.
1348 tarp
: new Dygraph
.IFrameTarp(),
1350 // contextB is the same thing as this context object but renamed.
1351 initializeMouseDown
: function(event
, g
, contextB
) {
1352 // prevents mouse drags from selecting page text.
1353 if (event
.preventDefault
) {
1354 event
.preventDefault(); // Firefox, Chrome, etc.
1356 event
.returnValue
= false; // IE
1357 event
.cancelBubble
= true;
1360 var canvasPos
= Dygraph
.findPos(g
.canvas_
);
1361 contextB
.px
= canvasPos
.x
;
1362 contextB
.py
= canvasPos
.y
;
1363 contextB
.dragStartX
= Dygraph
.dragGetX_(event
, contextB
);
1364 contextB
.dragStartY
= Dygraph
.dragGetY_(event
, contextB
);
1365 contextB
.cancelNextDblclick
= false;
1366 contextB
.tarp
.cover();
1370 var interactionModel
= this.getOption("interactionModel");
1372 // Self is the graph.
1375 // Function that binds the graph and context to the handler.
1376 var bindHandler
= function(handler
) {
1377 return function(event
) {
1378 handler(event
, self
, context
);
1382 for (var eventName
in interactionModel
) {
1383 if (!interactionModel
.hasOwnProperty(eventName
)) continue;
1384 this.addAndTrackEvent(this.mouseEventElement_
, eventName
,
1385 bindHandler(interactionModel
[eventName
]));
1388 // If the user releases the mouse button during a drag, but not over the
1389 // canvas, then it doesn't count as a zooming action.
1390 var mouseUpHandler
= function(event
) {
1391 if (context
.isZooming
|| context
.isPanning
) {
1392 context
.isZooming
= false;
1393 context
.dragStartX
= null;
1394 context
.dragStartY
= null;
1397 if (context
.isPanning
) {
1398 context
.isPanning
= false;
1399 context
.draggingDate
= null;
1400 context
.dateRange
= null;
1401 for (var i
= 0; i
< self
.axes_
.length
; i
++) {
1402 delete self
.axes_
[i
].draggingValue
;
1403 delete self
.axes_
[i
].dragValueRange
;
1407 context
.tarp
.uncover();
1410 this.addAndTrackEvent(document
, 'mouseup', mouseUpHandler
);
1414 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
1415 * up any previous zoom rectangles that were drawn. This could be optimized to
1416 * avoid extra redrawing, but it's tricky to avoid interactions with the status
1419 * @param {Number} direction the direction of the zoom rectangle. Acceptable
1420 * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL.
1421 * @param {Number} startX The X position where the drag started, in canvas
1423 * @param {Number} endX The current X position of the drag, in canvas coords.
1424 * @param {Number} startY The Y position where the drag started, in canvas
1426 * @param {Number} endY The current Y position of the drag, in canvas coords.
1427 * @param {Number} prevDirection the value of direction on the previous call to
1428 * this function. Used to avoid excess redrawing
1429 * @param {Number} prevEndX The value of endX on the previous call to this
1430 * function. Used to avoid excess redrawing
1431 * @param {Number} prevEndY The value of endY on the previous call to this
1432 * function. Used to avoid excess redrawing
1435 Dygraph
.prototype.drawZoomRect_
= function(direction
, startX
, endX
, startY
,
1436 endY
, prevDirection
, prevEndX
,
1438 var ctx
= this.canvas_ctx_
;
1440 // Clean up from the previous rect if necessary
1441 if (prevDirection
== Dygraph
.HORIZONTAL
) {
1442 ctx
.clearRect(Math
.min(startX
, prevEndX
), this.layout_
.getPlotArea().y
,
1443 Math
.abs(startX
- prevEndX
), this.layout_
.getPlotArea().h
);
1444 } else if (prevDirection
== Dygraph
.VERTICAL
) {
1445 ctx
.clearRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, prevEndY
),
1446 this.layout_
.getPlotArea().w
, Math
.abs(startY
- prevEndY
));
1449 // Draw a light-grey rectangle to show the new viewing area
1450 if (direction
== Dygraph
.HORIZONTAL
) {
1451 if (endX
&& startX
) {
1452 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1453 ctx
.fillRect(Math
.min(startX
, endX
), this.layout_
.getPlotArea().y
,
1454 Math
.abs(endX
- startX
), this.layout_
.getPlotArea().h
);
1456 } else if (direction
== Dygraph
.VERTICAL
) {
1457 if (endY
&& startY
) {
1458 ctx
.fillStyle
= "rgba(128,128,128,0.33)";
1459 ctx
.fillRect(this.layout_
.getPlotArea().x
, Math
.min(startY
, endY
),
1460 this.layout_
.getPlotArea().w
, Math
.abs(endY
- startY
));
1464 if (this.isUsingExcanvas_
) {
1465 this.currentZoomRectArgs_
= [direction
, startX
, endX
, startY
, endY
, 0, 0, 0];
1470 * Clear the zoom rectangle (and perform no zoom).
1473 Dygraph
.prototype.clearZoomRect_
= function() {
1474 this.currentZoomRectArgs_
= null;
1475 this.canvas_ctx_
.clearRect(0, 0, this.canvas_
.width
, this.canvas_
.height
);
1479 * Zoom to something containing [lowX, highX]. These are pixel coordinates in
1480 * the canvas. The exact zoom window may be slightly larger if there are no data
1481 * points near lowX or highX. Don't confuse this function with doZoomXDates,
1482 * which accepts dates that match the raw data. This function redraws the graph.
1484 * @param {Number} lowX The leftmost pixel value that should be visible.
1485 * @param {Number} highX The rightmost pixel value that should be visible.
1488 Dygraph
.prototype.doZoomX_
= function(lowX
, highX
) {
1489 this.currentZoomRectArgs_
= null;
1490 // Find the earliest and latest dates contained in this canvasx range.
1491 // Convert the call to date ranges of the raw data.
1492 var minDate
= this.toDataXCoord(lowX
);
1493 var maxDate
= this.toDataXCoord(highX
);
1494 this.doZoomXDates_(minDate
, maxDate
);
1498 * Transition function to use in animations. Returns values between 0.0
1499 * (totally old values) and 1.0 (totally new values) for each frame.
1502 Dygraph
.zoomAnimationFunction
= function(frame
, numFrames
) {
1504 return (1.0 - Math
.pow(k
, -frame
)) / (1.0 - Math
.pow(k
, -numFrames
));
1508 * Zoom to something containing [minDate, maxDate] values. Don't confuse this
1509 * method with doZoomX which accepts pixel coordinates. This function redraws
1512 * @param {Number} minDate The minimum date that should be visible.
1513 * @param {Number} maxDate The maximum date that should be visible.
1516 Dygraph
.prototype.doZoomXDates_
= function(minDate
, maxDate
) {
1517 // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation
1518 // can produce strange effects. Rather than the y-axis transitioning slowly
1519 // between values, it can jerk around.)
1520 var old_window
= this.xAxisRange();
1521 var new_window
= [minDate
, maxDate
];
1522 this.zoomed_x_
= true;
1524 this.doAnimatedZoom(old_window
, new_window
, null, null, function() {
1525 if (that
.getFunctionOption("zoomCallback")) {
1526 that
.getFunctionOption("zoomCallback")(
1527 minDate
, maxDate
, that
.yAxisRanges());
1533 * Zoom to something containing [lowY, highY]. These are pixel coordinates in
1534 * the canvas. This function redraws the graph.
1536 * @param {Number} lowY The topmost pixel value that should be visible.
1537 * @param {Number} highY The lowest pixel value that should be visible.
1540 Dygraph
.prototype.doZoomY_
= function(lowY
, highY
) {
1541 this.currentZoomRectArgs_
= null;
1542 // Find the highest and lowest values in pixel range for each axis.
1543 // Note that lowY (in pixels) corresponds to the max Value (in data coords).
1544 // This is because pixels increase as you go down on the screen, whereas data
1545 // coordinates increase as you go up the screen.
1546 var oldValueRanges
= this.yAxisRanges();
1547 var newValueRanges
= [];
1548 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1549 var hi
= this.toDataYCoord(lowY
, i
);
1550 var low
= this.toDataYCoord(highY
, i
);
1551 newValueRanges
.push([low
, hi
]);
1554 this.zoomed_y_
= true;
1556 this.doAnimatedZoom(null, null, oldValueRanges
, newValueRanges
, function() {
1557 if (that
.getFunctionOption("zoomCallback")) {
1558 var xRange
= that
.xAxisRange();
1559 that
.getFunctionOption("zoomCallback")(
1560 xRange
[0], xRange
[1], that
.yAxisRanges());
1566 * Reset the zoom to the original view coordinates. This is the same as
1567 * double-clicking on the graph.
1569 Dygraph
.prototype.resetZoom
= function() {
1570 var dirty
= false, dirtyX
= false, dirtyY
= false;
1571 if (this.dateWindow_
!== null) {
1576 for (var i
= 0; i
< this.axes_
.length
; i
++) {
1577 if (typeof(this.axes_
[i
].valueWindow
) !== 'undefined' && this.axes_
[i
].valueWindow
!== null) {
1583 // Clear any selection, since it's likely to be drawn in the wrong place.
1584 this.clearSelection();
1587 this.zoomed_x_
= false;
1588 this.zoomed_y_
= false;
1590 var minDate
= this.rawData_
[0][0];
1591 var maxDate
= this.rawData_
[this.rawData_
.length
- 1][0];
1593 // With only one frame, don't bother calculating extreme ranges.
1594 // TODO(danvk): merge this block w/ the code below
.
1595 if (!this.getBooleanOption("animatedZooms")) {
1596 this.dateWindow_
= null;
1597 for (i
= 0; i
< this.axes_
.length
; i
++) {
1598 if (this.axes_
[i
].valueWindow
!== null) {
1599 delete this.axes_
[i
].valueWindow
;
1603 if (this.getFunctionOption("zoomCallback")) {
1604 this.getFunctionOption("zoomCallback")(
1605 minDate
, maxDate
, this.yAxisRanges());
1610 var oldWindow
=null, newWindow
=null, oldValueRanges
=null, newValueRanges
=null;
1612 oldWindow
= this.xAxisRange();
1613 newWindow
= [minDate
, maxDate
];
1617 oldValueRanges
= this.yAxisRanges();
1618 // TODO(danvk): this is pretty inefficient
1619 var packed
= this.gatherDatasets_(this.rolledSeries_
, null);
1620 var extremes
= packed
.extremes
;
1622 // this has the side-effect of modifying this.axes_.
1623 // this doesn't make much sense in this context, but it's convenient (we
1624 // need this.axes_[*].extremeValues) and not harmful since we'll be
1625 // calling drawGraph_ shortly, which clobbers these values.
1626 this.computeYAxisRanges_(extremes
);
1628 newValueRanges
= [];
1629 for (i
= 0; i
< this.axes_
.length
; i
++) {
1630 var axis
= this.axes_
[i
];
1631 newValueRanges
.push((axis
.valueRange
!== null &&
1632 axis
.valueRange
!== undefined
) ?
1633 axis
.valueRange
: axis
.extremeRange
);
1638 this.doAnimatedZoom(oldWindow
, newWindow
, oldValueRanges
, newValueRanges
,
1640 that
.dateWindow_
= null;
1641 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1642 if (that
.axes_
[i
].valueWindow
!== null) {
1643 delete that
.axes_
[i
].valueWindow
;
1646 if (that
.getFunctionOption("zoomCallback")) {
1647 that
.getFunctionOption("zoomCallback")(
1648 minDate
, maxDate
, that
.yAxisRanges());
1655 * Combined animation logic for all zoom functions.
1656 * either the x parameters or y parameters may be null.
1659 Dygraph
.prototype.doAnimatedZoom
= function(oldXRange
, newXRange
, oldYRanges
, newYRanges
, callback
) {
1660 var steps
= this.getBooleanOption("animatedZooms") ?
1661 Dygraph
.ANIMATION_STEPS
: 1;
1664 var valueRanges
= [];
1667 if (oldXRange
!== null && newXRange
!== null) {
1668 for (step
= 1; step
<= steps
; step
++) {
1669 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1670 windows
[step
-1] = [oldXRange
[0]*(1-frac
) + frac
*newXRange
[0],
1671 oldXRange
[1]*(1-frac
) + frac
*newXRange
[1]];
1675 if (oldYRanges
!== null && newYRanges
!== null) {
1676 for (step
= 1; step
<= steps
; step
++) {
1677 frac
= Dygraph
.zoomAnimationFunction(step
, steps
);
1679 for (var j
= 0; j
< this.axes_
.length
; j
++) {
1680 thisRange
.push([oldYRanges
[j
][0]*(1-frac
) + frac
*newYRanges
[j
][0],
1681 oldYRanges
[j
][1]*(1-frac
) + frac
*newYRanges
[j
][1]]);
1683 valueRanges
[step
-1] = thisRange
;
1688 Dygraph
.repeatAndCleanup(function(step
) {
1689 if (valueRanges
.length
) {
1690 for (var i
= 0; i
< that
.axes_
.length
; i
++) {
1691 var w
= valueRanges
[step
][i
];
1692 that
.axes_
[i
].valueWindow
= [w
[0], w
[1]];
1695 if (windows
.length
) {
1696 that
.dateWindow_
= windows
[step
];
1699 }, steps
, Dygraph
.ANIMATION_DURATION
/ steps
, callback
);
1703 * Get the current graph's area object.
1705 * Returns: {x, y, w, h}
1707 Dygraph
.prototype.getArea
= function() {
1708 return this.plotter_
.area
;
1712 * Convert a mouse event to DOM coordinates relative to the graph origin.
1714 * Returns a two-element array: [X, Y].
1716 Dygraph
.prototype.eventToDomCoords
= function(event
) {
1717 if (event
.offsetX
&& event
.offsetY
) {
1718 return [ event
.offsetX
, event
.offsetY
];
1720 var eventElementPos
= Dygraph
.findPos(this.mouseEventElement_
);
1721 var canvasx
= Dygraph
.pageX(event
) - eventElementPos
.x
;
1722 var canvasy
= Dygraph
.pageY(event
) - eventElementPos
.y
;
1723 return [canvasx
, canvasy
];
1728 * Given a canvas X coordinate, find the closest row.
1729 * @param {Number} domX graph-relative DOM X coordinate
1730 * Returns: row number, integer
1733 Dygraph
.prototype.findClosestRow
= function(domX
) {
1734 var minDistX
= Infinity
;
1735 var closestRow
= -1;
1736 var sets
= this.layout_
.points
;
1737 for (var i
= 0; i
< sets
.length
; i
++) {
1738 var points
= sets
[i
];
1739 var len
= points
.length
;
1740 for (var j
= 0; j
< len
; j
++) {
1741 var point
= points
[j
];
1742 if (!Dygraph
.isValidPoint(point
, true)) continue;
1743 var dist
= Math
.abs(point
.canvasx
- domX
);
1744 if (dist
< minDistX
) {
1746 closestRow
= point
.idx
;
1755 * Given canvas X,Y coordinates, find the closest point.
1757 * This finds the individual data point across all visible series
1758 * that's closest to the supplied DOM coordinates using the standard
1759 * Euclidean X,Y distance.
1761 * @param {Number} domX graph-relative DOM X coordinate
1762 * @param {Number} domY graph-relative DOM Y coordinate
1763 * Returns: {row, seriesName, point}
1766 Dygraph
.prototype.findClosestPoint
= function(domX
, domY
) {
1767 var minDist
= Infinity
;
1768 var dist
, dx
, dy
, point
, closestPoint
, closestSeries
, closestRow
;
1769 for ( var setIdx
= this.layout_
.points
.length
- 1 ; setIdx
>= 0 ; --setIdx
) {
1770 var points
= this.layout_
.points
[setIdx
];
1771 for (var i
= 0; i
< points
.length
; ++i
) {
1773 if (!Dygraph
.isValidPoint(point
)) continue;
1774 dx
= point
.canvasx
- domX
;
1775 dy
= point
.canvasy
- domY
;
1776 dist
= dx
* dx
+ dy
* dy
;
1777 if (dist
< minDist
) {
1779 closestPoint
= point
;
1780 closestSeries
= setIdx
;
1781 closestRow
= point
.idx
;
1785 var name
= this.layout_
.setNames
[closestSeries
];
1794 * Given canvas X,Y coordinates, find the touched area in a stacked graph.
1796 * This first finds the X data point closest to the supplied DOM X coordinate,
1797 * then finds the series which puts the Y coordinate on top of its filled area,
1798 * using linear interpolation between adjacent point pairs.
1800 * @param {Number} domX graph-relative DOM X coordinate
1801 * @param {Number} domY graph-relative DOM Y coordinate
1802 * Returns: {row, seriesName, point}
1805 Dygraph
.prototype.findStackedPoint
= function(domX
, domY
) {
1806 var row
= this.findClosestRow(domX
);
1807 var closestPoint
, closestSeries
;
1808 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; ++setIdx
) {
1809 var boundary
= this.getLeftBoundary_(setIdx
);
1810 var rowIdx
= row
- boundary
;
1811 var points
= this.layout_
.points
[setIdx
];
1812 if (rowIdx
>= points
.length
) continue;
1813 var p1
= points
[rowIdx
];
1814 if (!Dygraph
.isValidPoint(p1
)) continue;
1815 var py
= p1
.canvasy
;
1816 if (domX
> p1
.canvasx
&& rowIdx
+ 1 < points
.length
) {
1817 // interpolate series Y value using next point
1818 var p2
= points
[rowIdx
+ 1];
1819 if (Dygraph
.isValidPoint(p2
)) {
1820 var dx
= p2
.canvasx
- p1
.canvasx
;
1822 var r
= (domX
- p1
.canvasx
) / dx
;
1823 py
+= r
* (p2
.canvasy
- p1
.canvasy
);
1826 } else if (domX
< p1
.canvasx
&& rowIdx
> 0) {
1827 // interpolate series Y value using previous point
1828 var p0
= points
[rowIdx
- 1];
1829 if (Dygraph
.isValidPoint(p0
)) {
1830 var dx
= p1
.canvasx
- p0
.canvasx
;
1832 var r
= (p1
.canvasx
- domX
) / dx
;
1833 py
+= r
* (p0
.canvasy
- p1
.canvasy
);
1837 // Stop if the point (domX, py) is above this series' upper edge
1838 if (setIdx
=== 0 || py
< domY
) {
1840 closestSeries
= setIdx
;
1843 var name
= this.layout_
.setNames
[closestSeries
];
1852 * When the mouse moves in the canvas, display information about a nearby data
1853 * point and draw dots over those points in the data series. This function
1854 * takes care of cleanup of previously-drawn dots.
1855 * @param {Object} event The mousemove event from the browser.
1858 Dygraph
.prototype.mouseMove_
= function(event
) {
1859 // This prevents JS errors when mousing over the canvas before data loads.
1860 var points
= this.layout_
.points
;
1861 if (points
=== undefined
|| points
=== null) return;
1863 var canvasCoords
= this.eventToDomCoords(event
);
1864 var canvasx
= canvasCoords
[0];
1865 var canvasy
= canvasCoords
[1];
1867 var highlightSeriesOpts
= this.getOption("highlightSeriesOpts");
1868 var selectionChanged
= false;
1869 if (highlightSeriesOpts
&& !this.isSeriesLocked()) {
1871 if (this.getBooleanOption("stackedGraph")) {
1872 closest
= this.findStackedPoint(canvasx
, canvasy
);
1874 closest
= this.findClosestPoint(canvasx
, canvasy
);
1876 selectionChanged
= this.setSelection(closest
.row
, closest
.seriesName
);
1878 var idx
= this.findClosestRow(canvasx
);
1879 selectionChanged
= this.setSelection(idx
);
1882 var callback
= this.getFunctionOption("highlightCallback");
1883 if (callback
&& selectionChanged
) {
1888 this.highlightSet_
);
1893 * Fetch left offset from the specified set index or if not passed, the
1894 * first defined boundaryIds record (see bug #236).
1897 Dygraph
.prototype.getLeftBoundary_
= function(setIdx
) {
1898 if (this.boundaryIds_
[setIdx
]) {
1899 return this.boundaryIds_
[setIdx
][0];
1901 for (var i
= 0; i
< this.boundaryIds_
.length
; i
++) {
1902 if (this.boundaryIds_
[i
] !== undefined
) {
1903 return this.boundaryIds_
[i
][0];
1910 Dygraph
.prototype.animateSelection_
= function(direction
) {
1911 var totalSteps
= 10;
1913 if (this.fadeLevel
=== undefined
) this.fadeLevel
= 0;
1914 if (this.animateId
=== undefined
) this.animateId
= 0;
1915 var start
= this.fadeLevel
;
1916 var steps
= direction
< 0 ? start
: totalSteps
- start
;
1918 if (this.fadeLevel
) {
1919 this.updateSelection_(1.0);
1924 var thisId
= ++this.animateId
;
1926 Dygraph
.repeatAndCleanup(
1928 // ignore simultaneous animations
1929 if (that
.animateId
!= thisId
) return;
1931 that
.fadeLevel
+= direction
;
1932 if (that
.fadeLevel
=== 0) {
1933 that
.clearSelection();
1935 that
.updateSelection_(that
.fadeLevel
/ totalSteps
);
1938 steps
, millis
, function() {});
1942 * Draw dots over the selectied points in the data series. This function
1943 * takes care of cleanup of previously-drawn dots.
1946 Dygraph
.prototype.updateSelection_
= function(opt_animFraction
) {
1947 /*var defaultPrevented = */
1948 this.cascadeEvents_('select', {
1949 selectedX
: this.lastx_
,
1950 selectedPoints
: this.selPoints_
1952 // TODO(danvk): use defaultPrevented here?
1954 // Clear the previously drawn vertical, if there is one
1956 var ctx
= this.canvas_ctx_
;
1957 if (this.getOption('highlightSeriesOpts')) {
1958 ctx
.clearRect(0, 0, this.width_
, this.height_
);
1959 var alpha
= 1.0 - this.getNumericOption('highlightSeriesBackgroundAlpha');
1961 // Activating background fade includes an animation effect for a gradual
1962 // fade. TODO(klausw): make this independently configurable if it causes
1963 // issues? Use a shared preference to control animations?
1964 var animateBackgroundFade
= true;
1965 if (animateBackgroundFade
) {
1966 if (opt_animFraction
=== undefined
) {
1967 // start a new animation
1968 this.animateSelection_(1);
1971 alpha
*= opt_animFraction
;
1973 ctx
.fillStyle
= 'rgba(255,255,255,' + alpha
+ ')';
1974 ctx
.fillRect(0, 0, this.width_
, this.height_
);
1977 // Redraw only the highlighted series in the interactive canvas (not the
1978 // static plot canvas, which is where series are usually drawn).
1979 this.plotter_
._renderLineChart(this.highlightSet_
, ctx
);
1980 } else if (this.previousVerticalX_
>= 0) {
1981 // Determine the maximum highlight circle size.
1982 var maxCircleSize
= 0;
1983 var labels
= this.attr_('labels');
1984 for (i
= 1; i
< labels
.length
; i
++) {
1985 var r
= this.getNumericOption('highlightCircleSize', labels
[i
]);
1986 if (r
> maxCircleSize
) maxCircleSize
= r
;
1988 var px
= this.previousVerticalX_
;
1989 ctx
.clearRect(px
- maxCircleSize
- 1, 0,
1990 2 * maxCircleSize
+ 2, this.height_
);
1993 if (this.isUsingExcanvas_
&& this.currentZoomRectArgs_
) {
1994 Dygraph
.prototype.drawZoomRect_
.apply(this, this.currentZoomRectArgs_
);
1997 if (this.selPoints_
.length
> 0) {
1998 // Draw colored circles over the center of each selected point
1999 var canvasx
= this.selPoints_
[0].canvasx
;
2001 for (i
= 0; i
< this.selPoints_
.length
; i
++) {
2002 var pt
= this.selPoints_
[i
];
2003 if (!Dygraph
.isOK(pt
.canvasy
)) continue;
2005 var circleSize
= this.getNumericOption('highlightCircleSize', pt
.name
);
2006 var callback
= this.getFunctionOption("drawHighlightPointCallback", pt
.name
);
2007 var color
= this.plotter_
.colors
[pt
.name
];
2009 callback
= Dygraph
.Circles
.DEFAULT
;
2011 ctx
.lineWidth
= this.getNumericOption('strokeWidth', pt
.name
);
2012 ctx
.strokeStyle
= color
;
2013 ctx
.fillStyle
= color
;
2014 callback(this.g
, pt
.name
, ctx
, canvasx
, pt
.canvasy
,
2015 color
, circleSize
, pt
.idx
);
2019 this.previousVerticalX_
= canvasx
;
2024 * Manually set the selected points and display information about them in the
2025 * legend. The selection can be cleared using clearSelection() and queried
2026 * using getSelection().
2027 * @param { Integer } row number that should be highlighted (i.e. appear with
2028 * hover dots on the chart). Set to false to clear any selection.
2029 * @param { seriesName } optional series name to highlight that series with the
2030 * the highlightSeriesOpts setting.
2031 * @param { locked } optional If true, keep seriesName selected when mousing
2032 * over the graph, disabling closest-series highlighting. Call clearSelection()
2035 Dygraph
.prototype.setSelection
= function(row
, opt_seriesName
, opt_locked
) {
2036 // Extract the points we've selected
2037 this.selPoints_
= [];
2039 var changed
= false;
2040 if (row
!== false && row
>= 0) {
2041 if (row
!= this.lastRow_
) changed
= true;
2042 this.lastRow_
= row
;
2043 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; ++setIdx
) {
2044 var points
= this.layout_
.points
[setIdx
];
2045 var setRow
= row
- this.getLeftBoundary_(setIdx
);
2046 if (setRow
< points
.length
) {
2047 var point
= points
[setRow
];
2048 if (point
.yval
!== null) this.selPoints_
.push(point
);
2052 if (this.lastRow_
>= 0) changed
= true;
2056 if (this.selPoints_
.length
) {
2057 this.lastx_
= this.selPoints_
[0].xval
;
2062 if (opt_seriesName
!== undefined
) {
2063 if (this.highlightSet_
!== opt_seriesName
) changed
= true;
2064 this.highlightSet_
= opt_seriesName
;
2067 if (opt_locked
!== undefined
) {
2068 this.lockedSet_
= opt_locked
;
2072 this.updateSelection_(undefined
);
2078 * The mouse has left the canvas. Clear out whatever artifacts remain
2079 * @param {Object} event the mouseout event from the browser.
2082 Dygraph
.prototype.mouseOut_
= function(event
) {
2083 if (this.getFunctionOption("unhighlightCallback")) {
2084 this.getFunctionOption("unhighlightCallback")(event
);
2087 if (this.getFunctionOption("hideOverlayOnMouseOut") && !this.lockedSet_
) {
2088 this.clearSelection();
2093 * Clears the current selection (i.e. points that were highlighted by moving
2094 * the mouse over the chart).
2096 Dygraph
.prototype.clearSelection
= function() {
2097 this.cascadeEvents_('deselect', {});
2099 this.lockedSet_
= false;
2100 // Get rid of the overlay data
2101 if (this.fadeLevel
) {
2102 this.animateSelection_(-1);
2105 this.canvas_ctx_
.clearRect(0, 0, this.width_
, this.height_
);
2107 this.selPoints_
= [];
2110 this.highlightSet_
= null;
2114 * Returns the number of the currently selected row. To get data for this row,
2115 * you can use the getValue method.
2116 * @return { Integer } row number, or -1 if nothing is selected
2118 Dygraph
.prototype.getSelection
= function() {
2119 if (!this.selPoints_
|| this.selPoints_
.length
< 1) {
2123 for (var setIdx
= 0; setIdx
< this.layout_
.points
.length
; setIdx
++) {
2124 var points
= this.layout_
.points
[setIdx
];
2125 for (var row
= 0; row
< points
.length
; row
++) {
2126 if (points
[row
].x
== this.selPoints_
[0].x
) {
2127 return points
[row
].idx
;
2135 * Returns the name of the currently-highlighted series.
2136 * Only available when the highlightSeriesOpts option is in use.
2138 Dygraph
.prototype.getHighlightSeries
= function() {
2139 return this.highlightSet_
;
2143 * Returns true if the currently-highlighted series was locked
2144 * via setSelection(..., seriesName, true).
2146 Dygraph
.prototype.isSeriesLocked
= function() {
2147 return this.lockedSet_
;
2151 * Fires when there's data available to be graphed.
2152 * @param {String} data Raw CSV data to be plotted
2155 Dygraph
.prototype.loadedEvent_
= function(data
) {
2156 this.rawData_
= this.parseCSV_(data
);
2161 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
2164 Dygraph
.prototype.addXTicks_
= function() {
2165 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
2167 if (this.dateWindow_
) {
2168 range
= [this.dateWindow_
[0], this.dateWindow_
[1]];
2170 range
= this.xAxisExtremes();
2173 var xAxisOptionsView
= this.optionsViewForAxis_('x');
2174 var xTicks
= xAxisOptionsView('ticker')(
2177 this.width_
, // TODO(danvk): should be area.width
2180 // var msg = 'ticker(' + range[0] + ', ' + range[1] + ', ' + this.width_ + ', ' + this.attr_('pixelsPerXLabel') + ') -> ' + JSON.stringify(xTicks);
2181 // console.log(msg);
2182 this.layout_
.setXTicks(xTicks
);
2186 * Returns the correct handler class for the currently set options.
2189 Dygraph
.prototype.getHandlerClass_
= function() {
2191 if (this.attr_('dataHandler')) {
2192 handlerClass
= this.attr_('dataHandler');
2193 } else if (this.fractions_
) {
2194 if (this.getBooleanOption('errorBars')) {
2195 handlerClass
= Dygraph
.DataHandlers
.FractionsBarsHandler
;
2197 handlerClass
= Dygraph
.DataHandlers
.DefaultFractionHandler
;
2199 } else if (this.getBooleanOption('customBars')) {
2200 handlerClass
= Dygraph
.DataHandlers
.CustomBarsHandler
;
2201 } else if (this.getBooleanOption('errorBars')) {
2202 handlerClass
= Dygraph
.DataHandlers
.ErrorBarsHandler
;
2204 handlerClass
= Dygraph
.DataHandlers
.DefaultHandler
;
2206 return handlerClass
;
2211 * This function is called once when the chart's data is changed or the options
2212 * dictionary is updated. It is _not_ called when the user pans or zooms. The
2213 * idea is that values derived from the chart's data can be computed here,
2214 * rather than every time the chart is drawn. This includes things like the
2215 * number of axes, rolling averages, etc.
2217 Dygraph
.prototype.predraw_
= function() {
2218 var start
= new Date();
2220 // Create the correct dataHandler
2221 this.dataHandler_
= new (this.getHandlerClass_())();
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();
2234 if (!this.is_initial_draw_
) {
2235 this.canvas_ctx_
.restore();
2236 this.hidden_ctx_
.restore();
2239 this.canvas_ctx_
.save();
2240 this.hidden_ctx_
.save();
2242 this.plotter_
= new DygraphCanvasRenderer(this,
2247 // The roller sits in the bottom left corner of the chart. We don't know where
2248 // this will be until the options are available, so it's positioned here.
2249 this.createRollInterface_();
2251 this.cascadeEvents_('predraw');
2253 // Convert the raw data (a 2D array) into the internal format and compute
2254 // rolling averages.
2255 this.rolledSeries_
= [null]; // x-axis is the first series and it's special
2256 for (var i
= 1; i
< this.numColumns(); i
++) {
2257 // var logScale = this.attr_('logscale', i); // TODO(klausw): this looks wrong // konigsberg thinks so too
.
2258 var series
= this.dataHandler_
.extractSeries(this.rawData_
, i
, this.attributes_
);
2259 if (this.rollPeriod_
> 1) {
2260 series
= this.dataHandler_
.rollingAverage(series
, this.rollPeriod_
, this.attributes_
);
2263 this.rolledSeries_
.push(series
);
2266 // If the data or options have changed, then we'd better redraw.
2269 // This is used to determine whether to do various animations.
2270 var end
= new Date();
2271 this.drawingTimeMs_
= (end
- start
);
2277 * xval_* and yval_* are the original unscaled data values,
2278 * while x_* and y_* are scaled to the range (0.0-1.0) for plotting.
2279 * yval_stacked is the cumulative Y value used for stacking graphs,
2280 * and bottom/top/minus/plus are used for error bar graphs.
2287 * y_bottom: ?number,
2289 * y_stacked: ?number,
2291 * yval_minus: ?number,
2293 * yval_plus: ?number,
2297 Dygraph
.PointType
= undefined
;
2300 * Calculates point stacking for stackedGraph=true.
2302 * For stacking purposes, interpolate or extend neighboring data across
2303 * NaN values based on stackedGraphNaNFill settings. This is for display
2304 * only, the underlying data value as shown in the legend remains NaN.
2306 * @param {Array.<Dygraph.PointType>} points Point array for a single series.
2307 * Updates each Point's yval_stacked property.
2308 * @param {Array.<number>} cumulativeYval Accumulated top-of-graph stacked Y
2309 * values for the series seen so far. Index is the row number. Updated
2310 * based on the current series's values.
2311 * @param {Array.<number>} seriesExtremes Min and max values, updated
2312 * to reflect the stacked values.
2313 * @param {string} fillMethod Interpolation method, one of 'all', 'inside', or
2317 Dygraph
.stackPoints_
= function(
2318 points
, cumulativeYval
, seriesExtremes
, fillMethod
) {
2319 var lastXval
= null;
2320 var prevPoint
= null;
2321 var nextPoint
= null;
2322 var nextPointIdx
= -1;
2324 // Find the next stackable point starting from the given index.
2325 var updateNextPoint
= function(idx
) {
2326 // If we've previously found a non-NaN point and haven't gone past it yet,
2328 if (nextPointIdx
>= idx
) return;
2330 // We haven't found a non-NaN point yet or have moved past it,
2331 // look towards the right to find a non-NaN point.
2332 for (var j
= idx
; j
< points
.length
; ++j
) {
2333 // Clear out a previously-found point (if any) since it's no longer
2334 // valid, we shouldn't use it for interpolation anymore.
2336 if (!isNaN(points
[j
].yval
) && points
[j
].yval
!== null) {
2338 nextPoint
= points
[j
];
2344 for (var i
= 0; i
< points
.length
; ++i
) {
2345 var point
= points
[i
];
2346 var xval
= point
.xval
;
2347 if (cumulativeYval
[xval
] === undefined
) {
2348 cumulativeYval
[xval
] = 0;
2351 var actualYval
= point
.yval
;
2352 if (isNaN(actualYval
) || actualYval
=== null) {
2353 // Interpolate/extend
for stacking purposes
if possible
.
2355 if (prevPoint
&& nextPoint
&& fillMethod
!= 'none') {
2356 // Use linear interpolation between prevPoint and nextPoint.
2357 actualYval
= prevPoint
.yval
+ (nextPoint
.yval
- prevPoint
.yval
) *
2358 ((xval
- prevPoint
.xval
) / (nextPoint
.xval
- prevPoint
.xval
));
2359 } else if (prevPoint
&& fillMethod
== 'all') {
2360 actualYval
= prevPoint
.yval
;
2361 } else if (nextPoint
&& fillMethod
== 'all') {
2362 actualYval
= nextPoint
.yval
;
2370 var stackedYval
= cumulativeYval
[xval
];
2371 if (lastXval
!= xval
) {
2372 // If an x-value is repeated, we ignore the duplicates.
2373 stackedYval
+= actualYval
;
2374 cumulativeYval
[xval
] = stackedYval
;
2378 point
.yval_stacked
= stackedYval
;
2380 if (stackedYval
> seriesExtremes
[1]) {
2381 seriesExtremes
[1] = stackedYval
;
2383 if (stackedYval
< seriesExtremes
[0]) {
2384 seriesExtremes
[0] = stackedYval
;
2391 * Loop over all fields and create datasets, calculating extreme y-values for
2392 * each series and extreme x-indices as we go.
2394 * dateWindow is passed in as an explicit parameter so that we can compute
2395 * extreme values "speculatively", i.e. without actually setting state on the
2398 * @param {Array.<Array.<Array.<(number|Array<number>)>>} rolledSeries, where
2399 * rolledSeries[seriesIndex][row] = raw point, where
2400 * seriesIndex is the column number starting with 1, and
2401 * rawPoint is [x,y] or [x, [y, err]] or [x, [y, yminus, yplus]].
2402 * @param {?Array.<number>} dateWindow [xmin, xmax] pair, or null.
2404 * points: Array.<Array.<Dygraph.PointType>>,
2405 * seriesExtremes: Array.<Array.<number>>,
2406 * boundaryIds: Array.<number>}}
2409 Dygraph
.prototype.gatherDatasets_
= function(rolledSeries
, dateWindow
) {
2410 var boundaryIds
= [];
2412 var cumulativeYval
= []; // For stacked series.
2413 var extremes
= {}; // series name -> [low, high]
2414 var seriesIdx
, sampleIdx
;
2415 var firstIdx
, lastIdx
;
2417 // Loop over the fields (series). Go from the last to the first,
2418 // because if they're stacked that's how we accumulate the values.
2419 var num_series
= rolledSeries
.length
- 1;
2421 for (seriesIdx
= num_series
; seriesIdx
>= 1; seriesIdx
--) {
2422 if (!this.visibility()[seriesIdx
- 1]) continue;
2424 // Prune down to the desired range, if necessary (for zooming)
2425 // Because there can be lines going to points outside of the visible area,
2426 // we actually prune to visible points, plus one on either side.
2428 series
= rolledSeries
[seriesIdx
];
2429 var low
= dateWindow
[0];
2430 var high
= dateWindow
[1];
2432 // TODO(danvk): do binary search instead of linear search.
2433 // TODO(danvk): pass firstIdx and lastIdx directly to the renderer.
2436 for (sampleIdx
= 0; sampleIdx
< series
.length
; sampleIdx
++) {
2437 if (series
[sampleIdx
][0] >= low
&& firstIdx
=== null) {
2438 firstIdx
= sampleIdx
;
2440 if (series
[sampleIdx
][0] <= high
) {
2441 lastIdx
= sampleIdx
;
2445 if (firstIdx
=== null) firstIdx
= 0;
2446 var correctedFirstIdx
= firstIdx
;
2447 var isInvalidValue
= true;
2448 while (isInvalidValue
&& correctedFirstIdx
> 0) {
2449 correctedFirstIdx
--;
2450 // check if the y value is null.
2451 isInvalidValue
= series
[correctedFirstIdx
][1] === null;
2454 if (lastIdx
=== null) lastIdx
= series
.length
- 1;
2455 var correctedLastIdx
= lastIdx
;
2456 isInvalidValue
= true;
2457 while (isInvalidValue
&& correctedLastIdx
< series
.length
- 1) {
2459 isInvalidValue
= series
[correctedLastIdx
][1] === null;
2462 if (correctedFirstIdx
!==firstIdx
) {
2463 firstIdx
= correctedFirstIdx
;
2465 if (correctedLastIdx
!== lastIdx
) {
2466 lastIdx
= correctedLastIdx
;
2469 boundaryIds
[seriesIdx
-1] = [firstIdx
, lastIdx
];
2471 // .slice's end is exclusive, we want to include lastIdx.
2472 series
= series
.slice(firstIdx
, lastIdx
+ 1);
2474 series
= rolledSeries
[seriesIdx
];
2475 boundaryIds
[seriesIdx
-1] = [0, series
.length
-1];
2478 var seriesName
= this.attr_("labels")[seriesIdx
];
2479 var seriesExtremes
= this.dataHandler_
.getExtremeYValues(series
,
2480 dateWindow
, this.getBooleanOption("stepPlot",seriesName
));
2482 var seriesPoints
= this.dataHandler_
.seriesToPoints(series
,
2483 seriesName
, boundaryIds
[seriesIdx
-1][0]);
2485 if (this.getBooleanOption("stackedGraph")) {
2486 Dygraph
.stackPoints_(seriesPoints
, cumulativeYval
, seriesExtremes
,
2487 this.getBooleanOption("stackedGraphNaNFill"));
2490 extremes
[seriesName
] = seriesExtremes
;
2491 points
[seriesIdx
] = seriesPoints
;
2494 return { points
: points
, extremes
: extremes
, boundaryIds
: boundaryIds
};
2498 * Update the graph with new data. This method is called when the viewing area
2499 * has changed. If the underlying data or options have changed, predraw_ will
2500 * be called before drawGraph_ is called.
2504 Dygraph
.prototype.drawGraph_
= function() {
2505 var start
= new Date();
2507 // This is used to set the second parameter to drawCallback, below.
2508 var is_initial_draw
= this.is_initial_draw_
;
2509 this.is_initial_draw_
= false;
2511 this.layout_
.removeAllDatasets();
2513 this.attrs_
.pointSize
= 0.5 * this.getNumericOption('highlightCircleSize');
2515 var packed
= this.gatherDatasets_(this.rolledSeries_
, this.dateWindow_
);
2516 var points
= packed
.points
;
2517 var extremes
= packed
.extremes
;
2518 this.boundaryIds_
= packed
.boundaryIds
;
2520 this.setIndexByName_
= {};
2521 var labels
= this.attr_("labels");
2522 if (labels
.length
> 0) {
2523 this.setIndexByName_
[labels
[0]] = 0;
2526 for (var i
= 1; i
< points
.length
; i
++) {
2527 this.setIndexByName_
[labels
[i
]] = i
;
2528 if (!this.visibility()[i
- 1]) continue;
2529 this.layout_
.addDataset(labels
[i
], points
[i
]);
2530 this.datasetIndex_
[i
] = dataIdx
++;
2533 this.computeYAxisRanges_(extremes
);
2534 this.layout_
.setYAxes(this.axes_
);
2538 // Save the X axis zoomed status as the updateOptions call will tend to set it erroneously
2539 var tmp_zoomed_x
= this.zoomed_x_
;
2540 // Tell PlotKit to use this new data and render itself
2541 this.zoomed_x_
= tmp_zoomed_x
;
2542 this.layout_
.evaluate();
2543 this.renderGraph_(is_initial_draw
);
2545 if (this.getStringOption("timingName")) {
2546 var end
= new Date();
2547 Dygraph
.info(this.getStringOption("timingName") + " - drawGraph: " + (end
- start
) + "ms");
2552 * This does the work of drawing the chart. It assumes that the layout and axis
2553 * scales have already been set (e.g. by predraw_).
2557 Dygraph
.prototype.renderGraph_
= function(is_initial_draw
) {
2558 this.cascadeEvents_('clearChart');
2559 this.plotter_
.clear();
2561 if (this.getFunctionOption('underlayCallback')) {
2562 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
2563 // users who expect a deprecated form of this callback.
2564 this.getFunctionOption('underlayCallback')(
2565 this.hidden_ctx_
, this.layout_
.getPlotArea(), this, this);
2569 canvas
: this.hidden_
,
2570 drawingContext
: this.hidden_ctx_
2572 this.cascadeEvents_('willDrawChart', e
);
2573 this.plotter_
.render();
2574 this.cascadeEvents_('didDrawChart', e
);
2575 this.lastRow_
= -1; // because plugins/legend.js clears the legend
2577 // TODO(danvk): is this a performance bottleneck when panning?
2578 // The interaction canvas should already be empty in that situation.
2579 this.canvas_
.getContext('2d').clearRect(0, 0, this.canvas_
.width
,
2580 this.canvas_
.height
);
2582 if (this.getFunctionOption("drawCallback") !== null) {
2583 this.getFunctionOption("drawCallback")(this, is_initial_draw
);
2585 if (is_initial_draw
) {
2586 this.readyFired_
= true;
2587 while (this.readyFns_
.length
> 0) {
2588 var fn
= this.readyFns_
.pop();
2596 * Determine properties of the y-axes which are independent of the data
2597 * currently being displayed. This includes things like the number of axes and
2598 * the style of the axes. It does not include the range of each axis and its
2600 * This fills in this.axes_.
2601 * axes_ = [ { options } ]
2602 * indices are into the axes_ array.
2604 Dygraph
.prototype.computeYAxes_
= function() {
2605 // Preserve valueWindow settings if they exist, and if the user hasn't
2606 // specified a new valueRange.
2607 var valueWindows
, axis
, index
, opts
, v
;
2608 if (this.axes_
!== undefined
&& this.user_attrs_
.hasOwnProperty("valueRange") === false) {
2610 for (index
= 0; index
< this.axes_
.length
; index
++) {
2611 valueWindows
.push(this.axes_
[index
].valueWindow
);
2615 // this.axes_ doesn't match this.attributes_.axes_.options. It's used for
2616 // data computation as well as options storage.
2617 // Go through once and add all the axes.
2620 for (axis
= 0; axis
< this.attributes_
.numAxes(); axis
++) {
2621 // Add a new axis, making a copy of its per-axis options.
2622 opts
= { g
: this };
2623 Dygraph
.update(opts
, this.attributes_
.axisOptions(axis
));
2624 this.axes_
[axis
] = opts
;
2628 // Copy global valueRange option over to the first axis.
2629 // NOTE(konigsberg): Are these two statements necessary?
2630 // I tried removing it. The automated tests pass, and manually
2631 // messing with tests/zoom
.html showed no trouble
.
2632 v
= this.attr_('valueRange');
2633 if (v
) this.axes_
[0].valueRange
= v
;
2635 if (valueWindows
!== undefined
) {
2636 // Restore valueWindow settings.
2638 // When going from two axes back to one, we only restore
2640 var idxCount
= Math
.min(valueWindows
.length
, this.axes_
.length
);
2642 for (index
= 0; index
< idxCount
; index
++) {
2643 this.axes_
[index
].valueWindow
= valueWindows
[index
];
2647 for (axis
= 0; axis
< this.axes_
.length
; axis
++) {
2649 opts
= this.optionsViewForAxis_('y' + (axis
? '2' : ''));
2650 v
= opts("valueRange");
2651 if (v
) this.axes_
[axis
].valueRange
= v
;
2652 } else { // To keep old behavior
2653 var axes
= this.user_attrs_
.axes
;
2654 if (axes
&& axes
.y2
) {
2655 v
= axes
.y2
.valueRange
;
2656 if (v
) this.axes_
[axis
].valueRange
= v
;
2663 * Returns the number of y-axes on the chart.
2664 * @return {Number} the number of axes.
2666 Dygraph
.prototype.numAxes
= function() {
2667 return this.attributes_
.numAxes();
2672 * Returns axis properties for the given series.
2673 * @param { String } setName The name of the series for which to get axis
2674 * properties, e.g. 'Y1'.
2675 * @return { Object } The axis properties.
2677 Dygraph
.prototype.axisPropertiesForSeries
= function(series
) {
2678 // TODO(danvk): handle errors.
2679 return this.axes_
[this.attributes_
.axisForSeries(series
)];
2684 * Determine the value range and tick marks for each axis.
2685 * @param {Object} extremes A mapping from seriesName -> [low, high]
2686 * This fills in the valueRange and ticks fields in each entry of this.axes_.
2688 Dygraph
.prototype.computeYAxisRanges_
= function(extremes
) {
2689 var isNullUndefinedOrNaN
= function(num
) {
2690 return isNaN(parseFloat(num
));
2692 var numAxes
= this.attributes_
.numAxes();
2693 var ypadCompat
, span
, series
, ypad
;
2697 // Compute extreme values, a span and tick marks for each axis.
2698 for (var i
= 0; i
< numAxes
; i
++) {
2699 var axis
= this.axes_
[i
];
2700 var logscale
= this.attributes_
.getForAxis("logscale", i
);
2701 var includeZero
= this.attributes_
.getForAxis("includeZero", i
);
2702 var independentTicks
= this.attributes_
.getForAxis("independentTicks", i
);
2703 series
= this.attributes_
.seriesForAxis(i
);
2705 // Add some padding. This supports two Y padding operation modes:
2707 // - backwards compatible (yRangePad not set):
2708 // 10% padding for automatic Y ranges, but not for user-supplied
2709 // ranges, and move a close-to-zero edge to zero except if
2710 // avoidMinZero is set, since drawing at the edge results in
2711 // invisible lines. Unfortunately lines drawn at the edge of a
2712 // user-supplied range will still be invisible. If logscale is
2713 // set, add a variable amount of padding at the top but
2714 // none at the bottom.
2716 // - new-style (yRangePad set by the user):
2717 // always add the specified Y padding.
2720 ypad
= 0.1; // add 10%
2721 if (this.getNumericOption('yRangePad') !== null) {
2723 // Convert pixel padding to ratio
2724 ypad
= this.getNumericOption('yRangePad') / this.plotter_
.area
.h
;
2727 if (series
.length
=== 0) {
2728 // If no series are defined or visible then use a reasonable default
2729 axis
.extremeRange
= [0, 1];
2731 // Calculate the extremes of extremes.
2732 var minY
= Infinity
; // extremes[series[0]][0];
2733 var maxY
= -Infinity
; // extremes[series[0]][1];
2734 var extremeMinY
, extremeMaxY
;
2736 for (var j
= 0; j
< series
.length
; j
++) {
2737 // this skips invisible series
2738 if (!extremes
.hasOwnProperty(series
[j
])) continue;
2740 // Only use valid extremes to stop null data series' from corrupting the scale.
2741 extremeMinY
= extremes
[series
[j
]][0];
2742 if (extremeMinY
!== null) {
2743 minY
= Math
.min(extremeMinY
, minY
);
2745 extremeMaxY
= extremes
[series
[j
]][1];
2746 if (extremeMaxY
!== null) {
2747 maxY
= Math
.max(extremeMaxY
, maxY
);
2751 // Include zero if requested by the user.
2752 if (includeZero
&& !logscale
) {
2753 if (minY
> 0) minY
= 0;
2754 if (maxY
< 0) maxY
= 0;
2757 // Ensure we have a valid scale, otherwise default to [0, 1] for safety.
2758 if (minY
== Infinity
) minY
= 0;
2759 if (maxY
== -Infinity
) maxY
= 1;
2762 // special case: if we have no sense of scale, center on the sole value.
2765 span
= Math
.abs(maxY
);
2767 // ... and if the sole value is zero, use range 0-1.
2773 var maxAxisY
, minAxisY
;
2776 maxAxisY
= maxY
+ ypad
* span
;
2779 var logpad
= Math
.exp(Math
.log(span
) * ypad
);
2780 maxAxisY
= maxY
* logpad
;
2781 minAxisY
= minY
/ logpad
;
2784 maxAxisY
= maxY
+ ypad
* span
;
2785 minAxisY
= minY
- ypad
* span
;
2787 // Backwards-compatible behavior: Move the span to start or end at zero if it's
2788 // close to zero, but not if avoidMinZero is set.
2789 if (ypadCompat
&& !this.getBooleanOption("avoidMinZero")) {
2790 if (minAxisY
< 0 && minY
>= 0) minAxisY
= 0;
2791 if (maxAxisY
> 0 && maxY
<= 0) maxAxisY
= 0;
2794 axis
.extremeRange
= [minAxisY
, maxAxisY
];
2796 if (axis
.valueWindow
) {
2797 // This is only set if the user has zoomed on the y-axis. It is never set
2798 // by a user. It takes precedence over axis.valueRange because, if you set
2799 // valueRange, you'd still expect to be able to pan.
2800 axis
.computedValueRange
= [axis
.valueWindow
[0], axis
.valueWindow
[1]];
2801 } else if (axis
.valueRange
) {
2802 // This is a user-set value range for this axis.
2803 var y0
= isNullUndefinedOrNaN(axis
.valueRange
[0]) ? axis
.extremeRange
[0] : axis
.valueRange
[0];
2804 var y1
= isNullUndefinedOrNaN(axis
.valueRange
[1]) ? axis
.extremeRange
[1] : axis
.valueRange
[1];
2806 if (axis
.logscale
) {
2807 var logpad
= Math
.exp(Math
.log(span
) * ypad
);
2816 axis
.computedValueRange
= [y0
, y1
];
2818 axis
.computedValueRange
= axis
.extremeRange
;
2822 if (independentTicks
) {
2823 axis
.independentTicks
= independentTicks
;
2824 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2825 var ticker
= opts('ticker');
2826 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2827 axis
.computedValueRange
[1],
2828 this.height_
, // TODO(danvk): should be area.height
2831 // Define the first independent axis as primary axis.
2832 if (!p_axis
) p_axis
= axis
;
2835 if (p_axis
=== undefined
) {
2836 throw ("Configuration Error: At least one axis has to have the \"independentTicks\" option activated.");
2838 // Add ticks. By default, all axes inherit the tick positions of the
2839 // primary axis. However, if an axis is specifically marked as having
2840 // independent ticks, then that is permissible as well.
2841 for (var i
= 0; i
< numAxes
; i
++) {
2842 var axis
= this.axes_
[i
];
2844 if (!axis
.independentTicks
) {
2845 var opts
= this.optionsViewForAxis_('y' + (i
? '2' : ''));
2846 var ticker
= opts('ticker');
2847 var p_ticks
= p_axis
.ticks
;
2848 var p_scale
= p_axis
.computedValueRange
[1] - p_axis
.computedValueRange
[0];
2849 var scale
= axis
.computedValueRange
[1] - axis
.computedValueRange
[0];
2850 var tick_values
= [];
2851 for (var k
= 0; k
< p_ticks
.length
; k
++) {
2852 var y_frac
= (p_ticks
[k
].v
- p_axis
.computedValueRange
[0]) / p_scale
;
2853 var y_val
= axis
.computedValueRange
[0] + y_frac
* scale
;
2854 tick_values
.push(y_val
);
2857 axis
.ticks
= ticker(axis
.computedValueRange
[0],
2858 axis
.computedValueRange
[1],
2859 this.height_
, // TODO(danvk): should be area.height
2868 * Detects the type of the str (date or numeric) and sets the various
2869 * formatting attributes in this.attrs_ based on this type.
2870 * @param {String} str An x value.
2873 Dygraph
.prototype.detectTypeFromString_
= function(str
) {
2875 var dashPos
= str
.indexOf('-'); // could be 2006-01-01 _or_ 1.0e-2
2876 if ((dashPos
> 0 && (str
[dashPos
-1] != 'e' && str
[dashPos
-1] != 'E')) ||
2877 str
.indexOf('/') >= 0 ||
2878 isNaN(parseFloat(str
))) {
2880 } else if (str
.length
== 8 && str
> '19700101' && str
< '20371231') {
2881 // TODO(danvk): remove support for this format.
2885 this.setXAxisOptions_(isDate
);
2888 Dygraph
.prototype.setXAxisOptions_
= function(isDate
) {
2890 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
2891 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
2892 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
2893 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
2895 /** @private (shut up, jsdoc!) */
2896 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
2897 // TODO(danvk): use Dygraph.numberValueFormatter here?
2898 /** @private (shut up, jsdoc!) */
2899 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
2900 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
2901 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
2907 * Parses a string in a special csv format. We expect a csv file where each
2908 * line is a date point, and the first field in each line is the date string.
2909 * We also expect that all remaining fields represent series.
2910 * if the errorBars attribute is set, then interpret the fields as:
2911 * date, series1, stddev1, series2, stddev2, ...
2912 * @param {[Object]} data See above.
2914 * @return [Object] An array with one entry for each row. These entries
2915 * are an array of cells in that row. The first entry is the parsed x-value for
2916 * the row. The second, third, etc. are the y-values. These can take on one of
2917 * three forms, depending on the CSV and constructor parameters:
2919 * 2. [ value, stddev ]
2920 * 3. [ low value, center value, high value ]
2922 Dygraph
.prototype.parseCSV_
= function(data
) {
2924 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
2925 var lines
= data
.split(line_delimiter
|| "\n");
2928 // Use the default delimiter or fall back to a tab if that makes sense.
2929 var delim
= this.getStringOption('delimiter');
2930 if (lines
[0].indexOf(delim
) == -1 && lines
[0].indexOf('\t') >= 0) {
2935 if (!('labels' in this.user_attrs_
)) {
2936 // User hasn't explicitly set labels, so they're (presumably) in the CSV.
2938 this.attrs_
.labels
= lines
[0].split(delim
); // NOTE: _not_ user_attrs_.
2939 this.attributes_
.reparseSeries();
2944 var defaultParserSet
= false; // attempt to auto-detect x value type
2945 var expectedCols
= this.attr_("labels").length
;
2946 var outOfOrder
= false;
2947 for (var i
= start
; i
< lines
.length
; i
++) {
2948 var line
= lines
[i
];
2950 if (line
.length
=== 0) continue; // skip blank lines
2951 if (line
[0] == '#') continue; // skip comment lines
2952 var inFields
= line
.split(delim
);
2953 if (inFields
.length
< 2) continue;
2956 if (!defaultParserSet
) {
2957 this.detectTypeFromString_(inFields
[0]);
2958 xParser
= this.getFunctionOption("xValueParser");
2959 defaultParserSet
= true;
2961 fields
[0] = xParser(inFields
[0], this);
2963 // If fractions are expected, parse the numbers as "A/B
"
2964 if (this.fractions_) {
2965 for (j = 1; j < inFields.length; j++) {
2966 // TODO(danvk): figure out an appropriate way to flag parse errors.
2967 vals = inFields[j].split("/");
2968 if (vals.length != 2) {
2969 Dygraph.error('Expected fractional "num
/den
" values in CSV data ' +
2970 "but found a value
'" + inFields[j] + "' on line
" +
2971 (1 + i) + " ('" + line + "') which is not of
this form
.");
2974 fields[j] = [Dygraph.parseFloat_(vals[0], i, line),
2975 Dygraph.parseFloat_(vals[1], i, line)];
2978 } else if (this.getBooleanOption("errorBars
")) {
2979 // If there are error bars, values are (value, stddev) pairs
2980 if (inFields.length % 2 != 1) {
2981 Dygraph.error('Expected alternating (value, stdev.) pairs in CSV data ' +
2982 'but line ' + (1 + i) + ' has an odd number of values (' +
2983 (inFields.length - 1) + "): '" + line + "'");
2985 for (j = 1; j < inFields.length; j += 2) {
2986 fields[(j + 1) / 2] = [Dygraph.parseFloat_(inFields[j], i, line),
2987 Dygraph.parseFloat_(inFields[j + 1], i, line)];
2989 } else if (this.getBooleanOption("customBars
")) {
2990 // Bars are a low;center;high tuple
2991 for (j = 1; j < inFields.length; j++) {
2992 var val = inFields[j];
2993 if (/^ *$/.test(val)) {
2994 fields[j] = [null, null, null];
2996 vals = val.split(";");
2997 if (vals.length == 3) {
2998 fields[j] = [ Dygraph.parseFloat_(vals[0], i, line),
2999 Dygraph.parseFloat_(vals[1], i, line),
3000 Dygraph.parseFloat_(vals[2], i, line) ];
3002 Dygraph.warn('When using customBars, values must be either blank ' +
3003 'or "low
;center
;high
" tuples (got "' + val +
3004 '" on line ' + (1+i));
3009 // Values are just numbers
3010 for (j = 1; j < inFields.length; j++) {
3011 fields[j] = Dygraph.parseFloat_(inFields[j], i, line);
3014 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
3018 if (fields.length != expectedCols) {
3019 Dygraph.error("Number of columns
in line
" + i + " (" + fields.length +
3020 ") does not agree
with number of
labels (" + expectedCols +
3024 // If the user specified the 'labels' option and none of the cells of the
3025 // first row parsed correctly, then they probably double-specified the
3026 // labels. We go with the values set in the option, discard this row and
3027 // log a warning to the JS console.
3028 if (i === 0 && this.attr_('labels')) {
3029 var all_null = true;
3030 for (j = 0; all_null && j < fields.length; j++) {
3031 if (fields[j]) all_null = false;
3034 Dygraph.warn("The dygraphs
'labels' option is set
, but the first row
" +
3035 "of CSV
data ('" + line + "') appears to also contain
" +
3036 "labels
. Will drop the CSV labels and
use the option
" +
3045 Dygraph.warn("CSV is out of order
; order it correctly to speed loading
.");
3046 ret.sort(function(a,b) { return a[0] - b[0]; });
3054 * The user has provided their data as a pre-packaged JS array. If the x values
3055 * are numeric, this is the same as dygraphs' internal format. If the x values
3056 * are dates, we need to convert them from Date objects to ms since epoch.
3057 * @param {[Object]} data
3058 * @return {[Object]} data with numeric x values.
3060 Dygraph.prototype.parseArray_ = function(data) {
3061 // Peek at the first x value to see if it's numeric.
3062 if (data.length === 0) {
3063 Dygraph.error("Can
't plot empty data set");
3066 if (data[0].length === 0) {
3067 Dygraph.error("Data set cannot contain an empty row");
3072 if (this.attr_("labels") === null) {
3073 Dygraph.warn("Using default labels. Set labels explicitly via 'labels
' " +
3074 "in the options parameter");
3075 this.attrs_.labels = [ "X" ];
3076 for (i = 1; i < data[0].length; i++) {
3077 this.attrs_.labels.push("Y" + i); // Not user_attrs_.
3079 this.attributes_.reparseSeries();
3081 var num_labels = this.attr_("labels");
3082 if (num_labels.length != data[0].length) {
3083 Dygraph.error("Mismatch between number of labels (" + num_labels + ")" +
3084 " and number of columns in array (" + data[0].length + ")");
3089 if (Dygraph.isDateLike(data[0][0])) {
3090 // Some intelligent defaults for a date x-axis.
3091 this.attrs_.axes.x.valueFormatter = Dygraph.dateString_;
3092 this.attrs_.axes.x.ticker = Dygraph.dateTicker;
3093 this.attrs_.axes.x.axisLabelFormatter = Dygraph.dateAxisFormatter;
3095 // Assume they're all dates
.
3096 var parsedData
= Dygraph
.clone(data
);
3097 for (i
= 0; i
< data
.length
; i
++) {
3098 if (parsedData
[i
].length
=== 0) {
3099 Dygraph
.error("Row " + (1 + i
) + " of data is empty");
3102 if (parsedData
[i
][0] === null ||
3103 typeof(parsedData
[i
][0].getTime
) != 'function' ||
3104 isNaN(parsedData
[i
][0].getTime())) {
3105 Dygraph
.error("x value in row " + (1 + i
) + " is not a Date");
3108 parsedData
[i
][0] = parsedData
[i
][0].getTime();
3112 // Some intelligent defaults for a numeric x-axis.
3113 /** @private (shut up, jsdoc!) */
3114 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3115 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3116 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.numberAxisLabelFormatter
;
3122 * Parses a DataTable object from gviz.
3123 * The data is expected to have a first column that is either a date or a
3124 * number. All subsequent columns must be numbers. If there is a clear mismatch
3125 * between this.xValueParser_ and the type of the first column, it will be
3126 * fixed. Fills out rawData_.
3127 * @param {[Object]} data See above.
3130 Dygraph
.prototype.parseDataTable_
= function(data
) {
3131 var shortTextForAnnotationNum
= function(num
) {
3132 // converts [0-9]+ [A-Z][a-z]*
3133 // example: 0=A, 1=B, 25=Z, 26=Aa, 27=Ab
3134 // and continues like.. Ba Bb .. Za .. Zz..Aaa...Zzz Aaaa Zzzz
3135 var shortText
= String
.fromCharCode(65 /* A */ + num
% 26);
3136 num
= Math
.floor(num
/ 26);
3138 shortText
= String
.fromCharCode(65 /* A */ + (num
- 1) % 26 ) + shortText
.toLowerCase();
3139 num
= Math
.floor((num
- 1) / 26);
3144 var cols
= data
.getNumberOfColumns();
3145 var rows
= data
.getNumberOfRows();
3147 var indepType
= data
.getColumnType(0);
3148 if (indepType
== 'date' || indepType
== 'datetime') {
3149 this.attrs_
.xValueParser
= Dygraph
.dateParser
;
3150 this.attrs_
.axes
.x
.valueFormatter
= Dygraph
.dateString_
;
3151 this.attrs_
.axes
.x
.ticker
= Dygraph
.dateTicker
;
3152 this.attrs_
.axes
.x
.axisLabelFormatter
= Dygraph
.dateAxisFormatter
;
3153 } else if (indepType
== 'number') {
3154 this.attrs_
.xValueParser
= function(x
) { return parseFloat(x
); };
3155 this.attrs_
.axes
.x
.valueFormatter
= function(x
) { return x
; };
3156 this.attrs_
.axes
.x
.ticker
= Dygraph
.numericLinearTicks
;
3157 this.attrs_
.axes
.x
.axisLabelFormatter
= this.attrs_
.axes
.x
.valueFormatter
;
3159 Dygraph
.error("only 'date', 'datetime' and 'number' types are supported " +
3160 "for column 1 of DataTable input (Got '" + indepType
+ "')");
3164 // Array of the column indices which contain data (and not annotations).
3166 var annotationCols
= {}; // data index -> [annotation cols]
3167 var hasAnnotations
= false;
3169 for (i
= 1; i
< cols
; i
++) {
3170 var type
= data
.getColumnType(i
);
3171 if (type
== 'number') {
3173 } else if (type
== 'string' && this.getBooleanOption('displayAnnotations')) {
3174 // This is OK -- it's an annotation column.
3175 var dataIdx
= colIdx
[colIdx
.length
- 1];
3176 if (!annotationCols
.hasOwnProperty(dataIdx
)) {
3177 annotationCols
[dataIdx
] = [i
];
3179 annotationCols
[dataIdx
].push(i
);
3181 hasAnnotations
= true;
3183 Dygraph
.error("Only 'number' is supported as a dependent type with Gviz." +
3184 " 'string' is only supported if displayAnnotations is true");
3188 // Read column labels
3189 // TODO(danvk): add support back for errorBars
3190 var labels
= [data
.getColumnLabel(0)];
3191 for (i
= 0; i
< colIdx
.length
; i
++) {
3192 labels
.push(data
.getColumnLabel(colIdx
[i
]));
3193 if (this.getBooleanOption("errorBars")) i
+= 1;
3195 this.attrs_
.labels
= labels
;
3196 cols
= labels
.length
;
3199 var outOfOrder
= false;
3200 var annotations
= [];
3201 for (i
= 0; i
< rows
; i
++) {
3203 if (typeof(data
.getValue(i
, 0)) === 'undefined' ||
3204 data
.getValue(i
, 0) === null) {
3205 Dygraph
.warn("Ignoring row " + i
+
3206 " of DataTable because of undefined or null first column.");
3210 if (indepType
== 'date' || indepType
== 'datetime') {
3211 row
.push(data
.getValue(i
, 0).getTime());
3213 row
.push(data
.getValue(i
, 0));
3215 if (!this.getBooleanOption("errorBars")) {
3216 for (j
= 0; j
< colIdx
.length
; j
++) {
3217 var col
= colIdx
[j
];
3218 row
.push(data
.getValue(i
, col
));
3219 if (hasAnnotations
&&
3220 annotationCols
.hasOwnProperty(col
) &&
3221 data
.getValue(i
, annotationCols
[col
][0]) !== null) {
3223 ann
.series
= data
.getColumnLabel(col
);
3225 ann
.shortText
= shortTextForAnnotationNum(annotations
.length
);
3227 for (var k
= 0; k
< annotationCols
[col
].length
; k
++) {
3228 if (k
) ann
.text
+= "\n";
3229 ann
.text
+= data
.getValue(i
, annotationCols
[col
][k
]);
3231 annotations
.push(ann
);
3235 // Strip out infinities, which give dygraphs problems later on.
3236 for (j
= 0; j
< row
.length
; j
++) {
3237 if (!isFinite(row
[j
])) row
[j
] = null;
3240 for (j
= 0; j
< cols
- 1; j
++) {
3241 row
.push([ data
.getValue(i
, 1 + 2 * j
), data
.getValue(i
, 2 + 2 * j
) ]);
3244 if (ret
.length
> 0 && row
[0] < ret
[ret
.length
- 1][0]) {
3251 Dygraph
.warn("DataTable is out of order; order it correctly to speed loading.");
3252 ret
.sort(function(a
,b
) { return a
[0] - b
[0]; });
3254 this.rawData_
= ret
;
3256 if (annotations
.length
> 0) {
3257 this.setAnnotations(annotations
, true);
3259 this.attributes_
.reparseSeries();
3263 * Get the CSV data. If it's in a function, call that function. If it's in a
3264 * file, do an XMLHttpRequest to get it.
3267 Dygraph
.prototype.start_
= function() {
3268 var data
= this.file_
;
3270 // Functions can return references of all other types.
3271 if (typeof data
== 'function') {
3275 if (Dygraph
.isArrayLike(data
)) {
3276 this.rawData_
= this.parseArray_(data
);
3278 } else if (typeof data
== 'object' &&
3279 typeof data
.getColumnRange
== 'function') {
3280 // must be a DataTable from gviz.
3281 this.parseDataTable_(data
);
3283 } else if (typeof data
== 'string') {
3284 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
3285 var line_delimiter
= Dygraph
.detectLineDelimiter(data
);
3286 if (line_delimiter
) {
3287 this.loadedEvent_(data
);
3291 if (window
.XMLHttpRequest
) {
3292 // Firefox, Opera, IE7, and other browsers will use the native object
3293 req
= new XMLHttpRequest();
3295 // IE 5 and 6 will use the ActiveX control
3296 req
= new ActiveXObject("Microsoft.XMLHTTP");
3300 req
.onreadystatechange
= function () {
3301 if (req
.readyState
== 4) {
3302 if (req
.status
=== 200 || // Normal http
3303 req
.status
=== 0) { // Chrome w/ --allow
-file
-access
-from
-files
3304 caller
.loadedEvent_(req
.responseText
);
3309 req
.open("GET", data
, true);
3313 Dygraph
.error("Unknown data format: " + (typeof data
));
3318 * Changes various properties of the graph. These can include:
3320 * <li>file: changes the source data for the graph</li>
3321 * <li>errorBars: changes whether the data contains stddev</li>
3324 * There's a huge variety of options that can be passed to this method. For a
3325 * full list, see http://dygraphs.com/options.html.
3327 * @param {Object} attrs The new properties and values
3328 * @param {Boolean} [block_redraw] Usually the chart is redrawn after every
3329 * call to updateOptions(). If you know better, you can pass true to explicitly
3330 * block the redraw. This can be useful for chaining updateOptions() calls,
3331 * avoiding the occasional infinite loop and preventing redraws when it's not
3332 * necessary (e.g. when updating a callback).
3334 Dygraph
.prototype.updateOptions
= function(input_attrs
, block_redraw
) {
3335 if (typeof(block_redraw
) == 'undefined') block_redraw
= false;
3337 // mapLegacyOptions_ drops the "file" parameter as a convenience to us.
3338 var file
= input_attrs
.file
;
3339 var attrs
= Dygraph
.mapLegacyOptions_(input_attrs
);
3341 // TODO(danvk): this is a mess. Move these options into attr_.
3342 if ('rollPeriod' in attrs
) {
3343 this.rollPeriod_
= attrs
.rollPeriod
;
3345 if ('dateWindow' in attrs
) {
3346 this.dateWindow_
= attrs
.dateWindow
;
3347 if (!('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3348 this.zoomed_x_
= (attrs
.dateWindow
!== null);
3351 if ('valueRange' in attrs
&& !('isZoomedIgnoreProgrammaticZoom' in attrs
)) {
3352 this.zoomed_y_
= (attrs
.valueRange
!== null);
3355 // TODO(danvk): validate per-series options.
3360 // highlightCircleSize
3362 // Check if this set options will require new points.
3363 var requiresNewPoints
= Dygraph
.isPixelChangingOptionList(this.attr_("labels"), attrs
);
3365 Dygraph
.updateDeep(this.user_attrs_
, attrs
);
3367 this.attributes_
.reparseSeries();
3371 if (!block_redraw
) this.start_();
3373 if (!block_redraw
) {
3374 if (requiresNewPoints
) {
3377 this.renderGraph_(false);
3384 * Returns a copy of the options with deprecated names converted into current
3385 * names. Also drops the (potentially-large) 'file' attribute. If the caller is
3386 * interested in that, they should save a copy before calling this.
3389 Dygraph
.mapLegacyOptions_
= function(attrs
) {
3391 for (var k
in attrs
) {
3392 if (k
== 'file') continue;
3393 if (attrs
.hasOwnProperty(k
)) my_attrs
[k
] = attrs
[k
];
3396 var set
= function(axis
, opt
, value
) {
3397 if (!my_attrs
.axes
) my_attrs
.axes
= {};
3398 if (!my_attrs
.axes
[axis
]) my_attrs
.axes
[axis
] = {};
3399 my_attrs
.axes
[axis
][opt
] = value
;
3401 var map
= function(opt
, axis
, new_opt
) {
3402 if (typeof(attrs
[opt
]) != 'undefined') {
3403 Dygraph
.warn("Option " + opt
+ " is deprecated. Use the " +
3404 new_opt
+ " option for the " + axis
+ " axis instead. " +
3405 "(e.g. { axes : { " + axis
+ " : { " + new_opt
+ " : ... } } } " +
3406 "(see http://dygraphs.com/per-axis.html for more information.");
3407 set(axis
, new_opt
, attrs
[opt
]);
3408 delete my_attrs
[opt
];
3412 // This maps, e.g., xValueFormater -> axes: { x: { valueFormatter: ... } }
3413 map('xValueFormatter', 'x', 'valueFormatter');
3414 map('pixelsPerXLabel', 'x', 'pixelsPerLabel');
3415 map('xAxisLabelFormatter', 'x', 'axisLabelFormatter');
3416 map('xTicker', 'x', 'ticker');
3417 map('yValueFormatter', 'y', 'valueFormatter');
3418 map('pixelsPerYLabel', 'y', 'pixelsPerLabel');
3419 map('yAxisLabelFormatter', 'y', 'axisLabelFormatter');
3420 map('yTicker', 'y', 'ticker');
3421 map('drawXGrid', 'x', 'drawGrid');
3422 map('drawXAxis', 'x', 'drawAxis');
3423 map('drawYGrid', 'y', 'drawGrid');
3424 map('drawYAxis', 'y', 'drawAxis');
3429 * Resizes the dygraph. If no parameters are specified, resizes to fill the
3430 * containing div (which has presumably changed size since the dygraph was
3431 * instantiated. If the width/height are specified, the div will be resized.
3433 * This is far more efficient than destroying and re-instantiating a
3434 * Dygraph, since it doesn't have to reparse the underlying data.
3436 * @param {Number} [width] Width (in pixels)
3437 * @param {Number} [height] Height (in pixels)
3439 Dygraph
.prototype.resize
= function(width
, height
) {
3440 if (this.resize_lock
) {
3443 this.resize_lock
= true;
3445 if ((width
=== null) != (height
=== null)) {
3446 Dygraph
.warn("Dygraph.resize() should be called with zero parameters or " +
3447 "two non-NULL parameters. Pretending it was zero.");
3448 width
= height
= null;
3451 var old_width
= this.width_
;
3452 var old_height
= this.height_
;
3455 this.maindiv_
.style
.width
= width
+ "px";
3456 this.maindiv_
.style
.height
= height
+ "px";
3457 this.width_
= width
;
3458 this.height_
= height
;
3460 this.width_
= this.maindiv_
.clientWidth
;
3461 this.height_
= this.maindiv_
.clientHeight
;
3464 if (old_width
!= this.width_
|| old_height
!= this.height_
) {
3465 // Resizing a canvas erases it, even when the size doesn't change, so
3466 // any resize needs to be followed by a redraw.
3467 this.resizeElements_();
3471 this.resize_lock
= false;
3475 * Adjusts the number of points in the rolling average. Updates the graph to
3476 * reflect the new averaging period.
3477 * @param {Number} length Number of points over which to average the data.
3479 Dygraph
.prototype.adjustRoll
= function(length
) {
3480 this.rollPeriod_
= length
;
3485 * Returns a boolean array of visibility statuses.
3487 Dygraph
.prototype.visibility
= function() {
3488 // Do lazy-initialization, so that this happens after we know the number of
3490 if (!this.getOption("visibility")) {
3491 this.attrs_
.visibility
= [];
3493 // TODO(danvk): it looks like this could go into an infinite loop w/ user_attrs
.
3494 while (this.getOption("visibility").length
< this.numColumns() - 1) {
3495 this.attrs_
.visibility
.push(true);
3497 return this.getOption("visibility");
3501 * Changes the visiblity of a series.
3503 * @param {number} num the series index
3504 * @param {boolean} value true or false, identifying the visibility.
3506 Dygraph
.prototype.setVisibility
= function(num
, value
) {
3507 var x
= this.visibility();
3508 if (num
< 0 || num
>= x
.length
) {
3509 Dygraph
.warn("invalid series number in setVisibility: " + num
);
3517 * How large of an area will the dygraph render itself in?
3518 * This is used for testing.
3519 * @return A {width: w, height: h} object.
3522 Dygraph
.prototype.size
= function() {
3523 return { width
: this.width_
, height
: this.height_
};
3527 * Update the list of annotations and redraw the chart.
3528 * See dygraphs.com/annotations.html for more info on how to use annotations.
3529 * @param ann {Array} An array of annotation objects.
3530 * @param suppressDraw {Boolean} Set to "true" to block chart redraw (optional).
3532 Dygraph
.prototype.setAnnotations
= function(ann
, suppressDraw
) {
3533 // Only add the annotation CSS rule once we know it will be used.
3534 Dygraph
.addAnnotationRule();
3535 this.annotations_
= ann
;
3536 if (!this.layout_
) {
3537 Dygraph
.warn("Tried to setAnnotations before dygraph was ready. " +
3538 "Try setting them in a ready() block. See " +
3539 "dygraphs.com/tests/annotation.html");
3543 this.layout_
.setAnnotations(this.annotations_
);
3544 if (!suppressDraw
) {
3550 * Return the list of annotations.
3552 Dygraph
.prototype.annotations
= function() {
3553 return this.annotations_
;
3557 * Get the list of label names for this graph. The first column is the
3558 * x-axis, so the data series names start at index 1.
3560 * Returns null when labels have not yet been defined.
3562 Dygraph
.prototype.getLabels
= function() {
3563 var labels
= this.attr_("labels");
3564 return labels
? labels
.slice() : null;
3568 * Get the index of a series (column) given its name. The first column is the
3569 * x-axis, so the data series start with index 1.
3571 Dygraph
.prototype.indexFromSetName
= function(name
) {
3572 return this.setIndexByName_
[name
];
3576 * Trigger a callback when the dygraph has drawn itself and is ready to be
3577 * manipulated. This is primarily useful when dygraphs has to do an XHR for the
3578 * data (i.e. a URL is passed as the data source) and the chart is drawn
3579 * asynchronously. If the chart has already drawn, the callback will fire
3582 * This is a good place to call setAnnotation().
3584 * @param {function(!Dygraph)} callback The callback to trigger when the chart
3587 Dygraph
.prototype.ready
= function(callback
) {
3588 if (this.is_initial_draw_
) {
3589 this.readyFns_
.push(callback
);
3597 * Adds a default style for the annotation CSS classes to the document. This is
3598 * only executed when annotations are actually used. It is designed to only be
3599 * called once -- all calls after the first will return immediately.
3601 Dygraph
.addAnnotationRule
= function() {
3602 // TODO(danvk): move this function into plugins/annotations.js
?
3603 if (Dygraph
.addedAnnotationCSS
) return;
3605 var rule
= "border: 1px solid black; " +
3606 "background-color: white; " +
3607 "text-align: center;";
3609 var styleSheetElement
= document
.createElement("style");
3610 styleSheetElement
.type
= "text/css";
3611 document
.getElementsByTagName("head")[0].appendChild(styleSheetElement
);
3613 // Find the first style sheet that we can access.
3614 // We may not add a rule to a style sheet from another domain for security
3615 // reasons. This sometimes comes up when using gviz, since the Google gviz JS
3616 // adds its own style sheets from google.com.
3617 for (var i
= 0; i
< document
.styleSheets
.length
; i
++) {
3618 if (document
.styleSheets
[i
].disabled
) continue;
3619 var mysheet
= document
.styleSheets
[i
];
3621 if (mysheet
.insertRule
) { // Firefox
3622 var idx
= mysheet
.cssRules
? mysheet
.cssRules
.length
: 0;
3623 mysheet
.insertRule(".dygraphDefaultAnnotation { " + rule
+ " }", idx
);
3624 } else if (mysheet
.addRule
) { // IE
3625 mysheet
.addRule(".dygraphDefaultAnnotation", rule
);
3627 Dygraph
.addedAnnotationCSS
= true;
3630 // Was likely a security exception.
3634 Dygraph
.warn("Unable to add default annotation CSS rule; display may be off.");