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 this.annotations
= [];
37 var parse
= this.attr_('xValueParser');
38 for (var i
= 0; i
< ann
.length
; i
++) {
40 if (!ann
[i
].xval
&& !ann
[i
].x
) {
41 this.dygraph_
.error("Annotations must have an 'x' property");
45 !(ann
[i
].hasOwnProperty('width') &&
46 ann
[i
].hasOwnProperty('height'))) {
47 this.dygraph_
.error("Must set width and height when setting " +
48 "annotation.icon property");
51 Dygraph
.update(a
, ann
[i
]);
52 if (!a
.xval
) a
.xval
= parse(a
.x
);
53 this.annotations
.push(a
);
57 DygraphLayout
.prototype.evaluate
= function() {
58 this._evaluateLimits();
59 this._evaluateLineCharts();
60 this._evaluateLineTicks();
61 this._evaluateAnnotations();
64 DygraphLayout
.prototype._evaluateLimits
= function() {
65 this.minxval
= this.maxxval
= null;
66 if (this.options
.dateWindow
) {
67 this.minxval
= this.options
.dateWindow
[0];
68 this.maxxval
= this.options
.dateWindow
[1];
70 for (var name
in this.datasets
) {
71 if (!this.datasets
.hasOwnProperty(name
)) continue;
72 var series
= this.datasets
[name
];
73 if (series
.length
> 1) {
74 var x1
= series
[0][0];
75 if (!this.minxval
|| x1
< this.minxval
) this.minxval
= x1
;
77 var x2
= series
[series
.length
- 1][0];
78 if (!this.maxxval
|| x2
> this.maxxval
) this.maxxval
= x2
;
82 this.xrange
= this.maxxval
- this.minxval
;
83 this.xscale
= (this.xrange
!= 0 ? 1/this.xrange
: 1.0);
85 for (var i
= 0; i
< this.options
.yAxes
.length
; i
++) {
86 var axis
= this.options
.yAxes
[i
];
87 axis
.minyval
= axis
.computedValueRange
[0];
88 axis
.maxyval
= axis
.computedValueRange
[1];
89 axis
.yrange
= axis
.maxyval
- axis
.minyval
;
90 axis
.yscale
= (axis
.yrange
!= 0 ? 1.0 / axis
.yrange
: 1.0);
94 DygraphLayout
.prototype._evaluateLineCharts
= function() {
96 this.points
= new Array();
97 for (var setName
in this.datasets
) {
98 if (!this.datasets
.hasOwnProperty(setName
)) continue;
100 var dataset
= this.datasets
[setName
];
101 var axis
= this.options
.yAxes
[this.options
.seriesToAxisMap
[setName
]];
103 for (var j
= 0; j
< dataset
.length
; j
++) {
104 var item
= dataset
[j
];
107 x
: ((parseFloat(item
[0]) - this.minxval
) * this.xscale
),
108 y
: 1.0 - ((parseFloat(item
[1]) - axis
.minyval
) * axis
.yscale
),
109 xval
: parseFloat(item
[0]),
110 yval
: parseFloat(item
[1]),
114 this.points
.push(point
);
119 DygraphLayout
.prototype._evaluateLineTicks
= function() {
120 this.xticks
= new Array();
121 for (var i
= 0; i
< this.options
.xTicks
.length
; i
++) {
122 var tick
= this.options
.xTicks
[i
];
123 var label
= tick
.label
;
124 var pos
= this.xscale
* (tick
.v
- this.minxval
);
125 if ((pos
>= 0.0) && (pos
<= 1.0)) {
126 this.xticks
.push([pos
, label
]);
130 this.yticks
= new Array();
131 for (var i
= 0; i
< this.options
.yAxes
.length
; i
++ ) {
132 var axis
= this.options
.yAxes
[i
];
133 for (var j
= 0; j
< axis
.ticks
.length
; j
++) {
134 var tick
= axis
.ticks
[j
];
135 var label
= tick
.label
;
136 var pos
= 1.0 - (axis
.yscale
* (tick
.v
- axis
.minyval
));
137 if ((pos
>= 0.0) && (pos
<= 1.0)) {
138 this.yticks
.push([i
, pos
, label
]);
146 * Behaves the same way as PlotKit.Layout, but also copies the errors
149 DygraphLayout
.prototype.evaluateWithError
= function() {
151 if (!this.options
.errorBars
) return;
153 // Copy over the error terms
154 var i
= 0; // index in this.points
155 for (var setName
in this.datasets
) {
156 if (!this.datasets
.hasOwnProperty(setName
)) continue;
158 var dataset
= this.datasets
[setName
];
159 for (var j
= 0; j
< dataset
.length
; j
++, i
++) {
160 var item
= dataset
[j
];
161 var xv
= parseFloat(item
[0]);
162 var yv
= parseFloat(item
[1]);
164 if (xv
== this.points
[i
].xval
&&
165 yv
== this.points
[i
].yval
) {
166 this.points
[i
].errorMinus
= parseFloat(item
[2]);
167 this.points
[i
].errorPlus
= parseFloat(item
[3]);
173 DygraphLayout
.prototype._evaluateAnnotations
= function() {
174 // Add the annotations to the point to which they belong.
175 // Make a map from (setName, xval) to annotation for quick lookups.
176 var annotations
= {};
177 for (var i
= 0; i
< this.annotations
.length
; i
++) {
178 var a
= this.annotations
[i
];
179 annotations
[a
.xval
+ "," + a
.series
] = a
;
182 this.annotated_points
= [];
183 for (var i
= 0; i
< this.points
.length
; i
++) {
184 var p
= this.points
[i
];
185 var k
= p
.xval
+ "," + p
.name
;
186 if (k
in annotations
) {
187 p
.annotation
= annotations
[k
];
188 this.annotated_points
.push(p
);
194 * Convenience function to remove all the data sets from a graph
196 DygraphLayout
.prototype.removeAllDatasets
= function() {
197 delete this.datasets
;
198 this.datasets
= new Array();
202 * Change the values of various layout options
203 * @param {Object} new_options an associative array of new properties
205 DygraphLayout
.prototype.updateOptions
= function(new_options
) {
206 Dygraph
.update(this.options
, new_options
? new_options
: {});
210 * Return a copy of the point at the indicated index, with its yval unstacked.
211 * @param int index of point in layout_.points
213 DygraphLayout
.prototype.unstackPointAtIndex
= function(idx
) {
214 var point
= this.points
[idx
];
216 // Clone the point since we modify it
217 var unstackedPoint
= {};
218 for (var i
in point
) {
219 unstackedPoint
[i
] = point
[i
];
222 if (!this.attr_("stackedGraph")) {
223 return unstackedPoint
;
226 // The unstacked yval is equal to the current yval minus the yval of the
227 // next point at the same xval.
228 for (var i
= idx
+1; i
< this.points
.length
; i
++) {
229 if (this.points
[i
].xval
== point
.xval
) {
230 unstackedPoint
.yval
-= this.points
[i
].yval
;
235 return unstackedPoint
;
238 // Subclass PlotKit.CanvasRenderer to add:
239 // 1. X/Y grid overlay
240 // 2. Ability to draw error bars (if required)
243 * Sets some PlotKit.CanvasRenderer options
244 * @param {Object} element The canvas to attach to
245 * @param {Layout} layout The DygraphLayout object for this graph.
246 * @param {Object} options Options to pass on to CanvasRenderer
248 DygraphCanvasRenderer
= function(dygraph
, element
, layout
, options
) {
249 // TODO(danvk): remove options, just use dygraph.attr_.
250 this.dygraph_
= dygraph
;
257 "axisLineColor": "black",
258 "axisLineWidth": 0.5,
260 "axisLabelColor": "black",
261 "axisLabelFont": "Arial",
262 "axisLabelFontSize": 9,
263 "axisLabelWidth": 50,
266 "gridLineColor": "rgb(128,128,128)",
268 "underlayCallback": null
270 Dygraph
.update(this.options
, options
);
272 this.layout
= layout
;
273 this.element
= element
;
274 this.container
= this.element
.parentNode
;
276 this.height
= this.element
.height
;
277 this.width
= this.element
.width
;
279 // --- check whether everything is ok before we return
280 if (!this.isIE
&& !(DygraphCanvasRenderer
.isSupported(this.element
)))
281 throw "Canvas is not supported.";
284 this.xlabels
= new Array();
285 this.ylabels
= new Array();
286 this.annotations
= new Array();
288 // TODO(danvk): consider all axes in this computation.
290 // TODO(danvk): per-axis setting.
291 x
: this.options
.yAxisLabelWidth
+ 2 * this.options
.axisTickSize
,
294 this.area
.w
= this.width
- this.area
.x
- this.options
.rightGap
;
295 this.area
.h
= this.height
- this.options
.axisLabelFontSize
-
296 2 * this.options
.axisTickSize
;
298 // Shrink the drawing area to accomodate additional y-axes.
299 if (this.dygraph_
.numAxes() == 2) {
300 // TODO(danvk): per-axis setting.
301 this.area
.w
-= (this.options
.yAxisLabelWidth
+ 2 * this.options
.axisTickSize
);
302 } else if (this.dygraph_
.numAxes() > 2) {
303 this.dygraph_
.error("Only two y-axes are supported at this time. (Trying " +
304 "to use " + this.dygraph_
.numAxes() + ")");
307 this.container
.style
.position
= "relative";
308 this.container
.style
.width
= this.width
+ "px";
310 // Set up a clipping area for the canvas (and the interaction canvas).
311 // This ensures that we don't overdraw.
312 var ctx
= this.element
.getContext("2d");
314 ctx
.rect(this.area
.x
, this.area
.y
, this.area
.w
, this.area
.h
);
317 var ctx
= this.dygraph_
.hidden_
.getContext("2d");
319 ctx
.rect(this.area
.x
, this.area
.y
, this.area
.w
, this.area
.h
);
323 DygraphCanvasRenderer
.prototype.clear
= function() {
325 // VML takes a while to start up, so we just poll every this.IEDelay
327 if (this.clearDelay
) {
328 this.clearDelay
.cancel();
329 this.clearDelay
= null;
331 var context
= this.element
.getContext("2d");
334 // TODO(danvk): this is broken, since MochiKit.Async is gone.
335 this.clearDelay
= MochiKit
.Async
.wait(this.IEDelay
);
336 this.clearDelay
.addCallback(bind(this.clear
, this));
341 var context
= this.element
.getContext("2d");
342 context
.clearRect(0, 0, this.width
, this.height
);
344 for (var i
= 0; i
< this.xlabels
.length
; i
++) {
345 var el
= this.xlabels
[i
];
346 el
.parentNode
.removeChild(el
);
348 for (var i
= 0; i
< this.ylabels
.length
; i
++) {
349 var el
= this.ylabels
[i
];
350 el
.parentNode
.removeChild(el
);
352 for (var i
= 0; i
< this.annotations
.length
; i
++) {
353 var el
= this.annotations
[i
];
354 el
.parentNode
.removeChild(el
);
356 this.xlabels
= new Array();
357 this.ylabels
= new Array();
358 this.annotations
= new Array();
362 DygraphCanvasRenderer
.isSupported
= function(canvasName
) {
365 if (typeof(canvasName
) == 'undefined' || canvasName
== null)
366 canvas
= document
.createElement("canvas");
369 var context
= canvas
.getContext("2d");
372 var ie
= navigator
.appVersion
.match(/MSIE (\d\.\d)/);
373 var opera
= (navigator
.userAgent
.toLowerCase().indexOf("opera") != -1);
374 if ((!ie
) || (ie
[1] < 6) || (opera
))
382 * Draw an X/Y grid on top of the existing plot
384 DygraphCanvasRenderer
.prototype.render
= function() {
385 // Draw the new X/Y grid
386 var ctx
= this.element
.getContext("2d");
388 if (this.options
.underlayCallback
) {
389 this.options
.underlayCallback(ctx
, this.area
, this.layout
, this.dygraph_
);
392 if (this.options
.drawYGrid
) {
393 var ticks
= this.layout
.yticks
;
395 ctx
.strokeStyle
= this.options
.gridLineColor
;
396 ctx
.lineWidth
= this.options
.axisLineWidth
;
397 for (var i
= 0; i
< ticks
.length
; i
++) {
398 // TODO(danvk): allow secondary axes to draw a grid, too.
399 if (ticks
[i
][0] != 0) continue;
401 var y
= this.area
.y
+ ticks
[i
][1] * this.area
.h
;
404 ctx
.lineTo(x
+ this.area
.w
, y
);
410 if (this.options
.drawXGrid
) {
411 var ticks
= this.layout
.xticks
;
413 ctx
.strokeStyle
= this.options
.gridLineColor
;
414 ctx
.lineWidth
= this.options
.axisLineWidth
;
415 for (var i
=0; i
<ticks
.length
; i
++) {
416 var x
= this.area
.x
+ ticks
[i
][0] * this.area
.w
;
417 var y
= this.area
.y
+ this.area
.h
;
420 ctx
.lineTo(x
, this.area
.y
);
426 // Do the ordinary rendering, as before
427 this._renderLineChart();
429 this._renderAnnotations();
433 DygraphCanvasRenderer
.prototype._renderAxis
= function() {
434 if (!this.options
.drawXAxis
&& !this.options
.drawYAxis
)
437 var context
= this.element
.getContext("2d");
440 "position": "absolute",
441 "fontSize": this.options
.axisLabelFontSize
+ "px",
443 "color": this.options
.axisLabelColor
,
444 "width": this.options
.axisLabelWidth
+ "px",
447 var makeDiv
= function(txt
) {
448 var div
= document
.createElement("div");
449 for (var name
in labelStyle
) {
450 if (labelStyle
.hasOwnProperty(name
)) {
451 div
.style
[name
] = labelStyle
[name
];
454 div
.appendChild(document
.createTextNode(txt
));
460 context
.strokeStyle
= this.options
.axisLineColor
;
461 context
.lineWidth
= this.options
.axisLineWidth
;
463 if (this.options
.drawYAxis
) {
464 if (this.layout
.yticks
&& this.layout
.yticks
.length
> 0) {
465 for (var i
= 0; i
< this.layout
.yticks
.length
; i
++) {
466 var tick
= this.layout
.yticks
[i
];
467 if (typeof(tick
) == "function") return;
470 if (tick
[0] == 1) { // right-side y-axis
471 x
= this.area
.x
+ this.area
.w
;
474 var y
= this.area
.y
+ tick
[1] * this.area
.h
;
476 context
.moveTo(x
, y
);
477 context
.lineTo(x
- sgn
* this.options
.axisTickSize
, y
);
481 var label
= makeDiv(tick
[2]);
482 var top
= (y
- this.options
.axisLabelFontSize
/ 2);
483 if (top
< 0) top
= 0;
485 if (top
+ this.options
.axisLabelFontSize
+ 3 > this.height
) {
486 label
.style
.bottom
= "0px";
488 label
.style
.top
= top
+ "px";
491 label
.style
.left
= "0px";
492 label
.style
.textAlign
= "right";
493 } else if (tick
[0] == 1) {
494 label
.style
.left
= (this.area
.x
+ this.area
.w
+
495 this.options
.axisTickSize
) + "px";
496 label
.style
.textAlign
= "left";
498 label
.style
.width
= this.options
.yAxisLabelWidth
+ "px";
499 this.container
.appendChild(label
);
500 this.ylabels
.push(label
);
503 // The lowest tick on the y-axis often overlaps with the leftmost
504 // tick on the x-axis. Shift the bottom tick up a little bit to
505 // compensate if necessary.
506 var bottomTick
= this.ylabels
[0];
507 var fontSize
= this.options
.axisLabelFontSize
;
508 var bottom
= parseInt(bottomTick
.style
.top
) + fontSize
;
509 if (bottom
> this.height
- fontSize
) {
510 bottomTick
.style
.top
= (parseInt(bottomTick
.style
.top
) -
511 fontSize
/ 2) + "px";
516 context
.moveTo(this.area
.x
, this.area
.y
);
517 context
.lineTo(this.area
.x
, this.area
.y
+ this.area
.h
);
521 if (this.dygraph_
.numAxes() == 2) {
523 context
.moveTo(this.area
.x
+ this.area
.w
, this.area
.y
);
524 context
.lineTo(this.area
.x
+ this.area
.w
, this.area
.y
+ this.area
.h
);
530 if (this.options
.drawXAxis
) {
531 if (this.layout
.xticks
) {
532 for (var i
= 0; i
< this.layout
.xticks
.length
; i
++) {
533 var tick
= this.layout
.xticks
[i
];
534 if (typeof(dataset
) == "function") return;
536 var x
= this.area
.x
+ tick
[0] * this.area
.w
;
537 var y
= this.area
.y
+ this.area
.h
;
539 context
.moveTo(x
, y
);
540 context
.lineTo(x
, y
+ this.options
.axisTickSize
);
544 var label
= makeDiv(tick
[1]);
545 label
.style
.textAlign
= "center";
546 label
.style
.bottom
= "0px";
548 var left
= (x
- this.options
.axisLabelWidth
/2);
549 if (left
+ this.options
.axisLabelWidth
> this.width
) {
550 left
= this.width
- this.options
.xAxisLabelWidth
;
551 label
.style
.textAlign
= "right";
555 label
.style
.textAlign
= "left";
558 label
.style
.left
= left
+ "px";
559 label
.style
.width
= this.options
.xAxisLabelWidth
+ "px";
560 this.container
.appendChild(label
);
561 this.xlabels
.push(label
);
566 context
.moveTo(this.area
.x
, this.area
.y
+ this.area
.h
);
567 context
.lineTo(this.area
.x
+ this.area
.w
, this.area
.y
+ this.area
.h
);
576 DygraphCanvasRenderer
.prototype._renderAnnotations
= function() {
577 var annotationStyle
= {
578 "position": "absolute",
579 "fontSize": this.options
.axisLabelFontSize
+ "px",
584 var bindEvt
= function(eventName
, classEventName
, p
, self
) {
586 var a
= p
.annotation
;
587 if (a
.hasOwnProperty(eventName
)) {
588 a
[eventName
](a
, p
, self
.dygraph_
, e
);
589 } else if (self
.dygraph_
.attr_(classEventName
)) {
590 self
.dygraph_
.attr_(classEventName
)(a
, p
, self
.dygraph_
,e
);
595 // Get a list of point with annotations.
596 var points
= this.layout
.annotated_points
;
597 for (var i
= 0; i
< points
.length
; i
++) {
599 if (p
.canvasx
< this.area
.x
|| p
.canvasx
> this.area
.x
+ this.area
.w
) {
603 var a
= p
.annotation
;
605 if (a
.hasOwnProperty("tickHeight")) {
606 tick_height
= a
.tickHeight
;
609 var div
= document
.createElement("div");
610 for (var name
in annotationStyle
) {
611 if (annotationStyle
.hasOwnProperty(name
)) {
612 div
.style
[name
] = annotationStyle
[name
];
615 if (!a
.hasOwnProperty('icon')) {
616 div
.className
= "dygraphDefaultAnnotation";
618 if (a
.hasOwnProperty('cssClass')) {
619 div
.className
+= " " + a
.cssClass
;
622 var width
= a
.hasOwnProperty('width') ? a
.width
: 16;
623 var height
= a
.hasOwnProperty('height') ? a
.height
: 16;
624 if (a
.hasOwnProperty('icon')) {
625 var img
= document
.createElement("img");
629 div
.appendChild(img
);
630 } else if (p
.annotation
.hasOwnProperty('shortText')) {
631 div
.appendChild(document
.createTextNode(p
.annotation
.shortText
));
633 div
.style
.left
= (p
.canvasx
- width
/ 2) + "px";
634 if (a
.attachAtBottom
) {
635 div
.style
.top
= (this.area
.h
- height
- tick_height
) + "px";
637 div
.style
.top
= (p
.canvasy
- height
- tick_height
) + "px";
639 div
.style
.width
= width
+ "px";
640 div
.style
.height
= height
+ "px";
641 div
.title
= p
.annotation
.text
;
642 div
.style
.color
= this.colors
[p
.name
];
643 div
.style
.borderColor
= this.colors
[p
.name
];
646 Dygraph
.addEvent(div
, 'click',
647 bindEvt('clickHandler', 'annotationClickHandler', p
, this));
648 Dygraph
.addEvent(div
, 'mouseover',
649 bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p
, this));
650 Dygraph
.addEvent(div
, 'mouseout',
651 bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p
, this));
652 Dygraph
.addEvent(div
, 'dblclick',
653 bindEvt('dblClickHandler', 'annotationDblClickHandler', p
, this));
655 this.container
.appendChild(div
);
656 this.annotations
.push(div
);
658 var ctx
= this.element
.getContext("2d");
659 ctx
.strokeStyle
= this.colors
[p
.name
];
661 if (!a
.attachAtBottom
) {
662 ctx
.moveTo(p
.canvasx
, p
.canvasy
);
663 ctx
.lineTo(p
.canvasx
, p
.canvasy
- 2 - tick_height
);
665 ctx
.moveTo(p
.canvasx
, this.area
.h
);
666 ctx
.lineTo(p
.canvasx
, this.area
.h
- 2 - tick_height
);
675 * Overrides the CanvasRenderer method to draw error bars
677 DygraphCanvasRenderer
.prototype._renderLineChart
= function() {
678 var context
= this.element
.getContext("2d");
679 var colorCount
= this.options
.colorScheme
.length
;
680 var colorScheme
= this.options
.colorScheme
;
681 var fillAlpha
= this.options
.fillAlpha
;
682 var errorBars
= this.layout
.options
.errorBars
;
683 var fillGraph
= this.layout
.options
.fillGraph
;
684 var stackedGraph
= this.layout
.options
.stackedGraph
;
685 var stepPlot
= this.layout
.options
.stepPlot
;
688 for (var name
in this.layout
.datasets
) {
689 if (this.layout
.datasets
.hasOwnProperty(name
)) {
693 var setCount
= setNames
.length
;
696 for (var i
= 0; i
< setCount
; i
++) {
697 this.colors
[setNames
[i
]] = colorScheme
[i
% colorCount
];
702 for (var i
= 0; i
< this.layout
.points
.length
; i
++) {
703 var point
= this.layout
.points
[i
];
704 point
.canvasx
= this.area
.w
* point
.x
+ this.area
.x
;
705 point
.canvasy
= this.area
.h
* point
.y
+ this.area
.y
;
709 var isOK
= function(x
) { return x
&& !isNaN(x
); };
714 this.dygraph_
.warn("Can't use fillGraph option with error bars");
717 for (var i
= 0; i
< setCount
; i
++) {
718 var setName
= setNames
[i
];
719 var axis
= this.layout
.options
.yAxes
[
720 this.layout
.options
.seriesToAxisMap
[setName
]];
721 var color
= this.colors
[setName
];
723 // setup graphics context
727 var prevYs
= [-1, -1];
728 var yscale
= axis
.yscale
;
729 // should be same color as the lines but only 15% opaque.
730 var rgb
= new RGBColor(color
);
731 var err_color
= 'rgba(' + rgb
.r
+ ',' + rgb
.g
+ ',' + rgb
.b
+ ',' +
733 ctx
.fillStyle
= err_color
;
735 for (var j
= 0; j
< this.layout
.points
.length
; j
++) {
736 var point
= this.layout
.points
[j
];
737 if (point
.name
== setName
) {
738 if (!isOK(point
.y
)) {
745 var newYs
= [ prevY
- point
.errorPlus
* yscale
,
746 prevY
+ point
.errorMinus
* yscale
];
749 var newYs
= [ point
.y
- point
.errorPlus
* yscale
,
750 point
.y
+ point
.errorMinus
* yscale
];
752 newYs
[0] = this.area
.h
* newYs
[0] + this.area
.y
;
753 newYs
[1] = this.area
.h
* newYs
[1] + this.area
.y
;
756 ctx
.moveTo(prevX
, newYs
[0]);
758 ctx
.moveTo(prevX
, prevYs
[0]);
760 ctx
.lineTo(point
.canvasx
, newYs
[0]);
761 ctx
.lineTo(point
.canvasx
, newYs
[1]);
763 ctx
.lineTo(prevX
, newYs
[1]);
765 ctx
.lineTo(prevX
, prevYs
[1]);
770 prevX
= point
.canvasx
;
775 } else if (fillGraph
) {
776 var baseline
= [] // for stacked graphs: baseline for filling
778 // process sets in reverse order (needed for stacked graphs)
779 for (var i
= setCount
- 1; i
>= 0; i
--) {
780 var setName
= setNames
[i
];
781 var color
= this.colors
[setName
];
782 var axis
= this.layout
.options
.yAxes
[
783 this.layout
.options
.seriesToAxisMap
[setName
]];
784 var axisY
= 1.0 + axis
.minyval
* axis
.yscale
;
785 if (axisY
< 0.0) axisY
= 0.0;
786 else if (axisY
> 1.0) axisY
= 1.0;
787 axisY
= this.area
.h
* axisY
+ this.area
.y
;
789 // setup graphics context
792 var prevYs
= [-1, -1];
793 var yscale
= axis
.yscale
;
794 // should be same color as the lines but only 15% opaque.
795 var rgb
= new RGBColor(color
);
796 var err_color
= 'rgba(' + rgb
.r
+ ',' + rgb
.g
+ ',' + rgb
.b
+ ',' +
798 ctx
.fillStyle
= err_color
;
800 for (var j
= 0; j
< this.layout
.points
.length
; j
++) {
801 var point
= this.layout
.points
[j
];
802 if (point
.name
== setName
) {
803 if (!isOK(point
.y
)) {
809 lastY
= baseline
[point
.canvasx
];
810 if (lastY
=== undefined
) lastY
= axisY
;
811 baseline
[point
.canvasx
] = point
.canvasy
;
812 newYs
= [ point
.canvasy
, lastY
];
814 newYs
= [ point
.canvasy
, axisY
];
817 ctx
.moveTo(prevX
, prevYs
[0]);
819 ctx
.lineTo(point
.canvasx
, prevYs
[0]);
821 ctx
.lineTo(point
.canvasx
, newYs
[0]);
823 ctx
.lineTo(point
.canvasx
, newYs
[1]);
824 ctx
.lineTo(prevX
, prevYs
[1]);
828 prevX
= point
.canvasx
;
835 for (var i
= 0; i
< setCount
; i
++) {
836 var setName
= setNames
[i
];
837 var color
= this.colors
[setName
];
838 var strokeWidth
= this.dygraph_
.attr_("strokeWidth", setName
);
840 // setup graphics context
842 var point
= this.layout
.points
[0];
843 var pointSize
= this.dygraph_
.attr_("pointSize", setName
);
844 var prevX
= null, prevY
= null;
845 var drawPoints
= this.dygraph_
.attr_("drawPoints", setName
);
846 var points
= this.layout
.points
;
847 for (var j
= 0; j
< points
.length
; j
++) {
848 var point
= points
[j
];
849 if (point
.name
== setName
) {
850 if (!isOK(point
.canvasy
)) {
851 if (stepPlot
&& prevX
!= null) {
852 // Draw a horizontal line to the start of the missing data
854 ctx
.strokeStyle
= color
;
855 ctx
.lineWidth
= this.options
.strokeWidth
;
856 ctx
.moveTo(prevX
, prevY
);
857 ctx
.lineTo(point
.canvasx
, prevY
);
860 // this will make us move to the next point, not draw a line to it.
861 prevX
= prevY
= null;
863 // A point is "isolated" if it is non-null but both the previous
864 // and next points are null.
865 var isIsolated
= (!prevX
&& (j
== points
.length
- 1 ||
866 !isOK(points
[j
+1].canvasy
)));
869 prevX
= point
.canvasx
;
870 prevY
= point
.canvasy
;
872 // TODO(danvk): figure out why this conditional is necessary.
875 ctx
.strokeStyle
= color
;
876 ctx
.lineWidth
= strokeWidth
;
877 ctx
.moveTo(prevX
, prevY
);
879 ctx
.lineTo(point
.canvasx
, prevY
);
881 prevX
= point
.canvasx
;
882 prevY
= point
.canvasy
;
883 ctx
.lineTo(prevX
, prevY
);
888 if (drawPoints
|| isIsolated
) {
890 ctx
.fillStyle
= color
;
891 ctx
.arc(point
.canvasx
, point
.canvasy
, pointSize
,
892 0, 2 * Math
.PI
, false);