1 // Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
2 // All Rights Reserved.
5 * @fileoverview Based on PlotKit, but modified to meet the needs of dygraphs.
6 * In particular, support for:
9 * - dygraphs attribute system
13 * Creates a new DygraphLayout object.
14 * @param {Object} options Options for PlotKit.Layout
15 * @return {Object} The DygraphLayout object
17 DygraphLayout
= function(dygraph
, options
) {
18 this.dygraph_
= dygraph
;
19 this.options
= {}; // TODO(danvk): remove, use attr_ instead.
20 Dygraph
.update(this.options
, options
? options
: {});
21 this.datasets
= new Array();
22 this.annotations
= new Array();
25 DygraphLayout
.prototype.attr_
= function(name
) {
26 return this.dygraph_
.attr_(name
);
29 DygraphLayout
.prototype.addDataset
= function(setname
, set_xy
) {
30 this.datasets
[setname
] = set_xy
;
33 DygraphLayout
.prototype.setAnnotations
= function(ann
) {
34 // The Dygraph object's annotations aren't parsed. We parse them here and
36 var parse
= this.attr_('xValueParser');
37 for (var i
= 0; i
< ann
.length
; i
++) {
39 if (!ann
[i
].xval
&& !ann
[i
].x
) {
40 this.dygraph_
.error("Annotations must have an 'x' property");
44 !(ann
[i
].hasOwnProperty('width') &&
45 ann
[i
].hasOwnProperty('height'))) {
46 this.dygraph_
.error("Must set width and height when setting " +
47 "annotation.icon property");
50 Dygraph
.update(a
, ann
[i
]);
51 if (!a
.xval
) a
.xval
= parse(a
.x
);
52 this.annotations
.push(a
);
56 DygraphLayout
.prototype.evaluate
= function() {
57 this._evaluateLimits();
58 this._evaluateLineCharts();
59 this._evaluateLineTicks();
60 this._evaluateAnnotations();
63 DygraphLayout
.prototype._evaluateLimits
= function() {
64 this.minxval
= this.maxxval
= null;
65 if (this.options
.dateWindow
) {
66 this.minxval
= this.options
.dateWindow
[0];
67 this.maxxval
= this.options
.dateWindow
[1];
69 for (var name
in this.datasets
) {
70 if (!this.datasets
.hasOwnProperty(name
)) continue;
71 var series
= this.datasets
[name
];
72 var x1
= series
[0][0];
73 if (!this.minxval
|| x1
< this.minxval
) this.minxval
= x1
;
75 var x2
= series
[series
.length
- 1][0];
76 if (!this.maxxval
|| x2
> this.maxxval
) this.maxxval
= x2
;
79 this.xrange
= this.maxxval
- this.minxval
;
80 this.xscale
= (this.xrange
!= 0 ? 1/this.xrange
: 1.0);
82 this.minyval
= this.options
.yAxis
[0];
83 this.maxyval
= this.options
.yAxis
[1];
84 this.yrange
= this.maxyval
- this.minyval
;
85 this.yscale
= (this.yrange
!= 0 ? 1/this.yrange
: 1.0);
88 DygraphLayout
.prototype._evaluateLineCharts
= function() {
90 this.points
= new Array();
91 for (var setName
in this.datasets
) {
92 if (!this.datasets
.hasOwnProperty(setName
)) continue;
94 var dataset
= this.datasets
[setName
];
95 for (var j
= 0; j
< dataset
.length
; j
++) {
96 var item
= dataset
[j
];
99 x
: ((parseFloat(item
[0]) - this.minxval
) * this.xscale
),
100 y
: 1.0 - ((parseFloat(item
[1]) - this.minyval
) * this.yscale
),
101 xval
: parseFloat(item
[0]),
102 yval
: parseFloat(item
[1]),
106 this.points
.push(point
);
111 DygraphLayout
.prototype._evaluateLineTicks
= function() {
112 this.xticks
= new Array();
113 for (var i
= 0; i
< this.options
.xTicks
.length
; i
++) {
114 var tick
= this.options
.xTicks
[i
];
115 var label
= tick
.label
;
116 var pos
= this.xscale
* (tick
.v
- this.minxval
);
117 if ((pos
>= 0.0) && (pos
<= 1.0)) {
118 this.xticks
.push([pos
, label
]);
122 this.yticks
= new Array();
123 for (var i
= 0; i
< this.options
.yTicks
.length
; i
++) {
124 var tick
= this.options
.yTicks
[i
];
125 var label
= tick
.label
;
126 var pos
= 1.0 - (this.yscale
* (tick
.v
- this.minyval
));
127 if ((pos
>= 0.0) && (pos
<= 1.0)) {
128 this.yticks
.push([pos
, label
]);
135 * Behaves the same way as PlotKit.Layout, but also copies the errors
138 DygraphLayout
.prototype.evaluateWithError
= function() {
140 if (!this.options
.errorBars
) return;
142 // Copy over the error terms
143 var i
= 0; // index in this.points
144 for (var setName
in this.datasets
) {
145 if (!this.datasets
.hasOwnProperty(setName
)) continue;
147 var dataset
= this.datasets
[setName
];
148 for (var j
= 0; j
< dataset
.length
; j
++, i
++) {
149 var item
= dataset
[j
];
150 var xv
= parseFloat(item
[0]);
151 var yv
= parseFloat(item
[1]);
153 if (xv
== this.points
[i
].xval
&&
154 yv
== this.points
[i
].yval
) {
155 this.points
[i
].errorMinus
= parseFloat(item
[2]);
156 this.points
[i
].errorPlus
= parseFloat(item
[3]);
162 DygraphLayout
.prototype._evaluateAnnotations
= function() {
163 // Add the annotations to the point to which they belong.
164 // Make a map from (setName, xval) to annotation for quick lookups.
165 var annotations
= {};
166 for (var i
= 0; i
< this.annotations
.length
; i
++) {
167 var a
= this.annotations
[i
];
168 annotations
[a
.xval
+ "," + a
.series
] = a
;
171 this.annotated_points
= [];
172 for (var i
= 0; i
< this.points
.length
; i
++) {
173 var p
= this.points
[i
];
174 var k
= p
.xval
+ "," + p
.name
;
175 if (k
in annotations
) {
176 p
.annotation
= annotations
[k
];
177 this.annotated_points
.push(p
);
183 * Convenience function to remove all the data sets from a graph
185 DygraphLayout
.prototype.removeAllDatasets
= function() {
186 delete this.datasets
;
187 this.datasets
= new Array();
191 * Change the values of various layout options
192 * @param {Object} new_options an associative array of new properties
194 DygraphLayout
.prototype.updateOptions
= function(new_options
) {
195 Dygraph
.update(this.options
, new_options
? new_options
: {});
199 * Return a copy of the point at the indicated index, with its yval unstacked.
200 * @param int index of point in layout_.points
202 DygraphLayout
.prototype.unstackPointAtIndex
= function(idx
) {
203 var point
= this.points
[idx
];
205 // Clone the point since we modify it
206 var unstackedPoint
= {};
207 for (var i
in point
) {
208 unstackedPoint
[i
] = point
[i
];
211 if (!this.attr_("stackedGraph")) {
212 return unstackedPoint
;
215 // The unstacked yval is equal to the current yval minus the yval of the
216 // next point at the same xval.
217 for (var i
= idx
+1; i
< this.points
.length
; i
++) {
218 if (this.points
[i
].xval
== point
.xval
) {
219 unstackedPoint
.yval
-= this.points
[i
].yval
;
224 return unstackedPoint
;
227 // Subclass PlotKit.CanvasRenderer to add:
228 // 1. X/Y grid overlay
229 // 2. Ability to draw error bars (if required)
232 * Sets some PlotKit.CanvasRenderer options
233 * @param {Object} element The canvas to attach to
234 * @param {Layout} layout The DygraphLayout object for this graph.
235 * @param {Object} options Options to pass on to CanvasRenderer
237 DygraphCanvasRenderer
= function(dygraph
, element
, layout
, options
) {
238 // TODO(danvk): remove options, just use dygraph.attr_.
239 this.dygraph_
= dygraph
;
246 "axisLineColor": "black",
247 "axisLineWidth": 0.5,
249 "axisLabelColor": "black",
250 "axisLabelFont": "Arial",
251 "axisLabelFontSize": 9,
252 "axisLabelWidth": 50,
255 "gridLineColor": "rgb(128,128,128)",
257 "underlayCallback": null
259 Dygraph
.update(this.options
, options
);
261 this.layout
= layout
;
262 this.element
= element
;
263 this.container
= this.element
.parentNode
;
265 this.height
= this.element
.height
;
266 this.width
= this.element
.width
;
268 // --- check whether everything is ok before we return
269 if (!this.isIE
&& !(DygraphCanvasRenderer
.isSupported(this.element
)))
270 throw "Canvas is not supported.";
273 this.xlabels
= new Array();
274 this.ylabels
= new Array();
275 this.annotations
= new Array();
278 x
: this.options
.yAxisLabelWidth
+ 2 * this.options
.axisTickSize
,
281 this.area
.w
= this.width
- this.area
.x
- this.options
.rightGap
;
282 this.area
.h
= this.height
- this.options
.axisLabelFontSize
-
283 2 * this.options
.axisTickSize
;
285 this.container
.style
.position
= "relative";
286 this.container
.style
.width
= this.width
+ "px";
289 DygraphCanvasRenderer
.prototype.clear
= function() {
291 // VML takes a while to start up, so we just poll every this.IEDelay
293 if (this.clearDelay
) {
294 this.clearDelay
.cancel();
295 this.clearDelay
= null;
297 var context
= this.element
.getContext("2d");
300 // TODO(danvk): this is broken, since MochiKit.Async is gone.
301 this.clearDelay
= MochiKit
.Async
.wait(this.IEDelay
);
302 this.clearDelay
.addCallback(bind(this.clear
, this));
307 var context
= this.element
.getContext("2d");
308 context
.clearRect(0, 0, this.width
, this.height
);
310 for (var i
= 0; i
< this.xlabels
.length
; i
++) {
311 var el
= this.xlabels
[i
];
312 el
.parentNode
.removeChild(el
);
314 for (var i
= 0; i
< this.ylabels
.length
; i
++) {
315 var el
= this.ylabels
[i
];
316 el
.parentNode
.removeChild(el
);
318 for (var i
= 0; i
< this.annotations
.length
; i
++) {
319 var el
= this.annotations
[i
];
320 el
.parentNode
.removeChild(el
);
322 this.xlabels
= new Array();
323 this.ylabels
= new Array();
324 this.annotations
= new Array();
328 DygraphCanvasRenderer
.isSupported
= function(canvasName
) {
331 if (typeof(canvasName
) == 'undefined' || canvasName
== null)
332 canvas
= document
.createElement("canvas");
335 var context
= canvas
.getContext("2d");
338 var ie
= navigator
.appVersion
.match(/MSIE (\d\.\d)/);
339 var opera
= (navigator
.userAgent
.toLowerCase().indexOf("opera") != -1);
340 if ((!ie
) || (ie
[1] < 6) || (opera
))
348 * Draw an X/Y grid on top of the existing plot
350 DygraphCanvasRenderer
.prototype.render
= function() {
351 // Draw the new X/Y grid
352 var ctx
= this.element
.getContext("2d");
354 if (this.options
.underlayCallback
) {
355 this.options
.underlayCallback(ctx
, this.area
, this.layout
, this.dygraph_
);
358 if (this.options
.drawYGrid
) {
359 var ticks
= this.layout
.yticks
;
361 ctx
.strokeStyle
= this.options
.gridLineColor
;
362 ctx
.lineWidth
= this.options
.axisLineWidth
;
363 for (var i
= 0; i
< ticks
.length
; i
++) {
365 var y
= this.area
.y
+ ticks
[i
][0] * this.area
.h
;
368 ctx
.lineTo(x
+ this.area
.w
, y
);
374 if (this.options
.drawXGrid
) {
375 var ticks
= this.layout
.xticks
;
377 ctx
.strokeStyle
= this.options
.gridLineColor
;
378 ctx
.lineWidth
= this.options
.axisLineWidth
;
379 for (var i
=0; i
<ticks
.length
; i
++) {
380 var x
= this.area
.x
+ ticks
[i
][0] * this.area
.w
;
381 var y
= this.area
.y
+ this.area
.h
;
384 ctx
.lineTo(x
, this.area
.y
);
390 // Do the ordinary rendering, as before
391 this._renderLineChart();
393 this._renderAnnotations();
397 DygraphCanvasRenderer
.prototype._renderAxis
= function() {
398 if (!this.options
.drawXAxis
&& !this.options
.drawYAxis
)
401 var context
= this.element
.getContext("2d");
404 "position": "absolute",
405 "fontSize": this.options
.axisLabelFontSize
+ "px",
407 "color": this.options
.axisLabelColor
,
408 "width": this.options
.axisLabelWidth
+ "px",
411 var makeDiv
= function(txt
) {
412 var div
= document
.createElement("div");
413 for (var name
in labelStyle
) {
414 if (labelStyle
.hasOwnProperty(name
)) {
415 div
.style
[name
] = labelStyle
[name
];
418 div
.appendChild(document
.createTextNode(txt
));
424 context
.strokeStyle
= this.options
.axisLineColor
;
425 context
.lineWidth
= this.options
.axisLineWidth
;
427 if (this.options
.drawYAxis
) {
428 if (this.layout
.yticks
&& this.layout
.yticks
.length
> 0) {
429 for (var i
= 0; i
< this.layout
.yticks
.length
; i
++) {
430 var tick
= this.layout
.yticks
[i
];
431 if (typeof(tick
) == "function") return;
433 var y
= this.area
.y
+ tick
[0] * this.area
.h
;
435 context
.moveTo(x
, y
);
436 context
.lineTo(x
- this.options
.axisTickSize
, y
);
440 var label
= makeDiv(tick
[1]);
441 var top
= (y
- this.options
.axisLabelFontSize
/ 2);
442 if (top
< 0) top
= 0;
444 if (top
+ this.options
.axisLabelFontSize
+ 3 > this.height
) {
445 label
.style
.bottom
= "0px";
447 label
.style
.top
= top
+ "px";
449 label
.style
.left
= "0px";
450 label
.style
.textAlign
= "right";
451 label
.style
.width
= this.options
.yAxisLabelWidth
+ "px";
452 this.container
.appendChild(label
);
453 this.ylabels
.push(label
);
456 // The lowest tick on the y-axis often overlaps with the leftmost
457 // tick on the x-axis. Shift the bottom tick up a little bit to
458 // compensate if necessary.
459 var bottomTick
= this.ylabels
[0];
460 var fontSize
= this.options
.axisLabelFontSize
;
461 var bottom
= parseInt(bottomTick
.style
.top
) + fontSize
;
462 if (bottom
> this.height
- fontSize
) {
463 bottomTick
.style
.top
= (parseInt(bottomTick
.style
.top
) -
464 fontSize
/ 2) + "px";
469 context
.moveTo(this.area
.x
, this.area
.y
);
470 context
.lineTo(this.area
.x
, this.area
.y
+ this.area
.h
);
475 if (this.options
.drawXAxis
) {
476 if (this.layout
.xticks
) {
477 for (var i
= 0; i
< this.layout
.xticks
.length
; i
++) {
478 var tick
= this.layout
.xticks
[i
];
479 if (typeof(dataset
) == "function") return;
481 var x
= this.area
.x
+ tick
[0] * this.area
.w
;
482 var y
= this.area
.y
+ this.area
.h
;
484 context
.moveTo(x
, y
);
485 context
.lineTo(x
, y
+ this.options
.axisTickSize
);
489 var label
= makeDiv(tick
[1]);
490 label
.style
.textAlign
= "center";
491 label
.style
.bottom
= "0px";
493 var left
= (x
- this.options
.axisLabelWidth
/2);
494 if (left
+ this.options
.axisLabelWidth
> this.width
) {
495 left
= this.width
- this.options
.xAxisLabelWidth
;
496 label
.style
.textAlign
= "right";
500 label
.style
.textAlign
= "left";
503 label
.style
.left
= left
+ "px";
504 label
.style
.width
= this.options
.xAxisLabelWidth
+ "px";
505 this.container
.appendChild(label
);
506 this.xlabels
.push(label
);
511 context
.moveTo(this.area
.x
, this.area
.y
+ this.area
.h
);
512 context
.lineTo(this.area
.x
+ this.area
.w
, this.area
.y
+ this.area
.h
);
521 DygraphCanvasRenderer
.prototype._renderAnnotations
= function() {
522 var annotationStyle
= {
523 "position": "absolute",
524 "fontSize": this.options
.axisLabelFontSize
+ "px",
529 var bindEvt
= function(eventName
, classEventName
, p
, self
) {
531 var a
= p
.annotation
;
532 if (a
.hasOwnProperty(eventName
)) {
533 a
[eventName
](a
, p
, self
.dygraph_
, e
);
534 } else if (self
.dygraph_
.attr_(classEventName
)) {
535 self
.dygraph_
.attr_(classEventName
)(a
, p
, self
.dygraph_
,e
);
540 // Get a list of point with annotations.
541 var points
= this.layout
.annotated_points
;
542 for (var i
= 0; i
< points
.length
; i
++) {
544 if (p
.canvasx
< this.area
.x
|| p
.canvasx
> this.area
.x
+ this.area
.w
) {
548 var a
= p
.annotation
;
550 if (a
.hasOwnProperty("tickHeight")) {
551 tick_height
= a
.tickHeight
;
554 var div
= document
.createElement("div");
555 for (var name
in annotationStyle
) {
556 if (annotationStyle
.hasOwnProperty(name
)) {
557 div
.style
[name
] = annotationStyle
[name
];
560 if (!a
.hasOwnProperty('icon')) {
561 div
.className
= "dygraphDefaultAnnotation";
563 if (a
.hasOwnProperty('cssClass')) {
564 div
.className
+= " " + a
.cssClass
;
567 var width
= a
.hasOwnProperty('width') ? a
.width
: 16;
568 var height
= a
.hasOwnProperty('height') ? a
.height
: 16;
569 if (a
.hasOwnProperty('icon')) {
570 var img
= document
.createElement("img");
574 div
.appendChild(img
);
575 } else if (p
.annotation
.hasOwnProperty('shortText')) {
576 div
.appendChild(document
.createTextNode(p
.annotation
.shortText
));
578 div
.style
.left
= (p
.canvasx
- width
/ 2) + "px";
579 if (a
.attachAtBottom
) {
580 div
.style
.top
= (this.area
.h
- height
- tick_height
) + "px";
582 div
.style
.top
= (p
.canvasy
- height
- tick_height
) + "px";
584 div
.style
.width
= width
+ "px";
585 div
.style
.height
= height
+ "px";
586 div
.title
= p
.annotation
.text
;
587 div
.style
.color
= this.colors
[p
.name
];
588 div
.style
.borderColor
= this.colors
[p
.name
];
591 Dygraph
.addEvent(div
, 'click',
592 bindEvt('clickHandler', 'annotationClickHandler', p
, this));
593 Dygraph
.addEvent(div
, 'mouseover',
594 bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p
, this));
595 Dygraph
.addEvent(div
, 'mouseout',
596 bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p
, this));
597 Dygraph
.addEvent(div
, 'dblclick',
598 bindEvt('dblClickHandler', 'annotationDblClickHandler', p
, this));
600 this.container
.appendChild(div
);
601 this.annotations
.push(div
);
603 var ctx
= this.element
.getContext("2d");
604 ctx
.strokeStyle
= this.colors
[p
.name
];
606 if (!a
.attachAtBottom
) {
607 ctx
.moveTo(p
.canvasx
, p
.canvasy
);
608 ctx
.lineTo(p
.canvasx
, p
.canvasy
- 2 - tick_height
);
610 ctx
.moveTo(p
.canvasx
, this.area
.h
);
611 ctx
.lineTo(p
.canvasx
, this.area
.h
- 2 - tick_height
);
620 * Overrides the CanvasRenderer method to draw error bars
622 DygraphCanvasRenderer
.prototype._renderLineChart
= function() {
623 var context
= this.element
.getContext("2d");
624 var colorCount
= this.options
.colorScheme
.length
;
625 var colorScheme
= this.options
.colorScheme
;
626 var fillAlpha
= this.options
.fillAlpha
;
627 var errorBars
= this.layout
.options
.errorBars
;
628 var fillGraph
= this.layout
.options
.fillGraph
;
629 var stackedGraph
= this.layout
.options
.stackedGraph
;
630 var stepPlot
= this.layout
.options
.stepPlot
;
633 for (var name
in this.layout
.datasets
) {
634 if (this.layout
.datasets
.hasOwnProperty(name
)) {
638 var setCount
= setNames
.length
;
641 for (var i
= 0; i
< setCount
; i
++) {
642 this.colors
[setNames
[i
]] = colorScheme
[i
% colorCount
];
647 for (var i
= 0; i
< this.layout
.points
.length
; i
++) {
648 var point
= this.layout
.points
[i
];
649 point
.canvasx
= this.area
.w
* point
.x
+ this.area
.x
;
650 point
.canvasy
= this.area
.h
* point
.y
+ this.area
.y
;
654 var isOK
= function(x
) { return x
&& !isNaN(x
); };
659 this.dygraph_
.warn("Can't use fillGraph option with error bars");
662 for (var i
= 0; i
< setCount
; i
++) {
663 var setName
= setNames
[i
];
664 var color
= this.colors
[setName
];
666 // setup graphics context
670 var prevYs
= [-1, -1];
671 var yscale
= this.layout
.yscale
;
672 // should be same color as the lines but only 15% opaque.
673 var rgb
= new RGBColor(color
);
674 var err_color
= 'rgba(' + rgb
.r
+ ',' + rgb
.g
+ ',' + rgb
.b
+ ',' +
676 ctx
.fillStyle
= err_color
;
678 for (var j
= 0; j
< this.layout
.points
.length
; j
++) {
679 var point
= this.layout
.points
[j
];
680 if (point
.name
== setName
) {
681 if (!isOK(point
.y
)) {
688 var newYs
= [ prevY
- point
.errorPlus
* yscale
,
689 prevY
+ point
.errorMinus
* yscale
];
692 var newYs
= [ point
.y
- point
.errorPlus
* yscale
,
693 point
.y
+ point
.errorMinus
* yscale
];
695 newYs
[0] = this.area
.h
* newYs
[0] + this.area
.y
;
696 newYs
[1] = this.area
.h
* newYs
[1] + this.area
.y
;
699 ctx
.moveTo(prevX
, newYs
[0]);
701 ctx
.moveTo(prevX
, prevYs
[0]);
703 ctx
.lineTo(point
.canvasx
, newYs
[0]);
704 ctx
.lineTo(point
.canvasx
, newYs
[1]);
706 ctx
.lineTo(prevX
, newYs
[1]);
708 ctx
.lineTo(prevX
, prevYs
[1]);
713 prevX
= point
.canvasx
;
718 } else if (fillGraph
) {
719 var axisY
= 1.0 + this.layout
.minyval
* this.layout
.yscale
;
720 if (axisY
< 0.0) axisY
= 0.0;
721 else if (axisY
> 1.0) axisY
= 1.0;
722 axisY
= this.area
.h
* axisY
+ this.area
.y
;
724 var baseline
= [] // for stacked graphs: baseline for filling
726 // process sets in reverse order (needed for stacked graphs)
727 for (var i
= setCount
- 1; i
>= 0; i
--) {
728 var setName
= setNames
[i
];
729 var color
= this.colors
[setName
];
731 // setup graphics context
734 var prevYs
= [-1, -1];
735 var yscale
= this.layout
.yscale
;
736 // should be same color as the lines but only 15% opaque.
737 var rgb
= new RGBColor(color
);
738 var err_color
= 'rgba(' + rgb
.r
+ ',' + rgb
.g
+ ',' + rgb
.b
+ ',' +
740 ctx
.fillStyle
= err_color
;
742 for (var j
= 0; j
< this.layout
.points
.length
; j
++) {
743 var point
= this.layout
.points
[j
];
744 if (point
.name
== setName
) {
745 if (!isOK(point
.y
)) {
751 lastY
= baseline
[point
.canvasx
];
752 if (lastY
=== undefined
) lastY
= axisY
;
753 baseline
[point
.canvasx
] = point
.canvasy
;
754 newYs
= [ point
.canvasy
, lastY
];
756 newYs
= [ point
.canvasy
, axisY
];
759 ctx
.moveTo(prevX
, prevYs
[0]);
761 ctx
.lineTo(point
.canvasx
, prevYs
[0]);
763 ctx
.lineTo(point
.canvasx
, newYs
[0]);
765 ctx
.lineTo(point
.canvasx
, newYs
[1]);
766 ctx
.lineTo(prevX
, prevYs
[1]);
770 prevX
= point
.canvasx
;
777 for (var i
= 0; i
< setCount
; i
++) {
778 var setName
= setNames
[i
];
779 var color
= this.colors
[setName
];
780 var strokeWidth
= this.dygraph_
.attr_("strokeWidth", setName
);
782 // setup graphics context
784 var point
= this.layout
.points
[0];
785 var pointSize
= this.dygraph_
.attr_("pointSize", setName
);
786 var prevX
= null, prevY
= null;
787 var drawPoints
= this.dygraph_
.attr_("drawPoints", setName
);
788 var points
= this.layout
.points
;
789 for (var j
= 0; j
< points
.length
; j
++) {
790 var point
= points
[j
];
791 if (point
.name
== setName
) {
792 if (!isOK(point
.canvasy
)) {
793 // this will make us move to the next point, not draw a line to it.
794 prevX
= prevY
= null;
796 // A point is "isolated" if it is non-null but both the previous
797 // and next points are null.
798 var isIsolated
= (!prevX
&& (j
== points
.length
- 1 ||
799 !isOK(points
[j
+1].canvasy
)));
802 prevX
= point
.canvasx
;
803 prevY
= point
.canvasy
;
805 // TODO(danvk): figure out why this conditional is necessary.
808 ctx
.strokeStyle
= color
;
809 ctx
.lineWidth
= strokeWidth
;
810 ctx
.moveTo(prevX
, prevY
);
812 ctx
.lineTo(point
.canvasx
, prevY
);
814 prevX
= point
.canvasx
;
815 prevY
= point
.canvasy
;
816 ctx
.lineTo(prevX
, prevY
);
821 if (drawPoints
|| isIsolated
) {
823 ctx
.fillStyle
= color
;
824 ctx
.arc(point
.canvasx
, point
.canvasy
, pointSize
,
825 0, 2 * Math
.PI
, false);