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
11 * High level overview of classes:
14 * This contains all the data to be charted.
15 * It uses data coordinates, but also records the chart range (in data
16 * coordinates) and hence is able to calculate percentage positions ('In
17 * this view, Point A lies 25% down the x-axis.')
18 * Two things that it does not do are:
19 * 1. Record pixel coordinates for anything.
20 * 2. (oddly) determine anything about the layout of chart elements.
21 * The naming is a vestige of Dygraph's original PlotKit roots.
23 * - DygraphCanvasRenderer
24 * This class determines the charting area (in pixel coordinates), maps the
25 * percentage coordinates in the DygraphLayout to pixels and draws them.
26 * It's also responsible for creating chart DOM elements, i.e. annotations,
27 * tick mark labels, the title and the x/y-axis labels.
31 * Creates a new DygraphLayout object.
32 * @return {Object} The DygraphLayout object
34 DygraphLayout
= function(dygraph
) {
35 this.dygraph_
= dygraph
;
36 this.datasets
= new Array();
37 this.annotations
= new Array();
40 // TODO(danvk): it's odd that xTicks_ and yTicks_ are inputs, but xticks and
41 // yticks are outputs. Clean this up.
46 DygraphLayout
.prototype.attr_
= function(name
) {
47 return this.dygraph_
.attr_(name
);
50 DygraphLayout
.prototype.addDataset
= function(setname
, set_xy
) {
51 this.datasets
[setname
] = set_xy
;
54 DygraphLayout
.prototype.setAnnotations
= function(ann
) {
55 // The Dygraph object's annotations aren't parsed. We parse them here and
56 // save a copy. If there is no parser, then the user must be using raw format.
57 this.annotations
= [];
58 var parse
= this.attr_('xValueParser') || function(x
) { return x
; };
59 for (var i
= 0; i
< ann
.length
; i
++) {
61 if (!ann
[i
].xval
&& !ann
[i
].x
) {
62 this.dygraph_
.error("Annotations must have an 'x' property");
66 !(ann
[i
].hasOwnProperty('width') &&
67 ann
[i
].hasOwnProperty('height'))) {
68 this.dygraph_
.error("Must set width and height when setting " +
69 "annotation.icon property");
72 Dygraph
.update(a
, ann
[i
]);
73 if (!a
.xval
) a
.xval
= parse(a
.x
);
74 this.annotations
.push(a
);
78 DygraphLayout
.prototype.setXTicks
= function(xTicks
) {
79 this.xTicks_
= xTicks
;
82 // TODO(danvk): add this to the Dygraph object's API or move it into Layout.
83 DygraphLayout
.prototype.setYAxes
= function (yAxes
) {
87 DygraphLayout
.prototype.setDateWindow
= function(dateWindow
) {
88 this.dateWindow_
= dateWindow
;
91 DygraphLayout
.prototype.evaluate
= function() {
92 this._evaluateLimits();
93 this._evaluateLineCharts();
94 this._evaluateLineTicks();
95 this._evaluateAnnotations();
98 DygraphLayout
.prototype._evaluateLimits
= function() {
99 this.minxval
= this.maxxval
= null;
100 if (this.dateWindow_
) {
101 this.minxval
= this.dateWindow_
[0];
102 this.maxxval
= this.dateWindow_
[1];
104 for (var name
in this.datasets
) {
105 if (!this.datasets
.hasOwnProperty(name
)) continue;
106 var series
= this.datasets
[name
];
107 if (series
.length
> 1) {
108 var x1
= series
[0][0];
109 if (!this.minxval
|| x1
< this.minxval
) this.minxval
= x1
;
111 var x2
= series
[series
.length
- 1][0];
112 if (!this.maxxval
|| x2
> this.maxxval
) this.maxxval
= x2
;
116 this.xrange
= this.maxxval
- this.minxval
;
117 this.xscale
= (this.xrange
!= 0 ? 1/this.xrange
: 1.0);
119 for (var i
= 0; i
< this.yAxes_
.length
; i
++) {
120 var axis
= this.yAxes_
[i
];
121 axis
.minyval
= axis
.computedValueRange
[0];
122 axis
.maxyval
= axis
.computedValueRange
[1];
123 axis
.yrange
= axis
.maxyval
- axis
.minyval
;
124 axis
.yscale
= (axis
.yrange
!= 0 ? 1.0 / axis
.yrange
: 1.0);
126 if (axis
.g
.attr_("logscale")) {
127 axis
.ylogrange
= Dygraph
.log10(axis
.maxyval
) - Dygraph
.log10(axis
.minyval
);
128 axis
.ylogscale
= (axis
.ylogrange
!= 0 ? 1.0 / axis
.ylogrange
: 1.0);
129 if (!isFinite(axis
.ylogrange
) || isNaN(axis
.ylogrange
)) {
130 axis
.g
.error('axis ' + i
+ ' of graph at ' + axis
.g
+
131 ' can\'t be displayed in log scale for range [' +
132 axis
.minyval
+ ' - ' + axis
.maxyval
+ ']');
138 DygraphLayout
.prototype._evaluateLineCharts
= function() {
140 this.points
= new Array();
141 for (var setName
in this.datasets
) {
142 if (!this.datasets
.hasOwnProperty(setName
)) continue;
144 var dataset
= this.datasets
[setName
];
145 var axis
= this.dygraph_
.axisPropertiesForSeries(setName
);
147 for (var j
= 0; j
< dataset
.length
; j
++) {
148 var item
= dataset
[j
];
152 yval
= 1.0 - ((Dygraph
.log10(parseFloat(item
[1])) - Dygraph
.log10(axis
.minyval
)) * axis
.ylogscale
); // really should just be yscale.
154 yval
= 1.0 - ((parseFloat(item
[1]) - axis
.minyval
) * axis
.yscale
);
158 x
: ((parseFloat(item
[0]) - this.minxval
) * this.xscale
),
160 xval
: parseFloat(item
[0]),
161 yval
: parseFloat(item
[1]),
165 this.points
.push(point
);
170 DygraphLayout
.prototype._evaluateLineTicks
= function() {
171 this.xticks
= new Array();
172 for (var i
= 0; i
< this.xTicks_
.length
; i
++) {
173 var tick
= this.xTicks_
[i
];
174 var label
= tick
.label
;
175 var pos
= this.xscale
* (tick
.v
- this.minxval
);
176 if ((pos
>= 0.0) && (pos
<= 1.0)) {
177 this.xticks
.push([pos
, label
]);
181 this.yticks
= new Array();
182 for (var i
= 0; i
< this.yAxes_
.length
; i
++ ) {
183 var axis
= this.yAxes_
[i
];
184 for (var j
= 0; j
< axis
.ticks
.length
; j
++) {
185 var tick
= axis
.ticks
[j
];
186 var label
= tick
.label
;
187 var pos
= this.dygraph_
.toPercentYCoord(tick
.v
, i
);
188 if ((pos
>= 0.0) && (pos
<= 1.0)) {
189 this.yticks
.push([i
, pos
, label
]);
197 * Behaves the same way as PlotKit.Layout, but also copies the errors
200 DygraphLayout
.prototype.evaluateWithError
= function() {
202 if (!(this.attr_('errorBars') || this.attr_('customBars'))) return;
204 // Copy over the error terms
205 var i
= 0; // index in this.points
206 for (var setName
in this.datasets
) {
207 if (!this.datasets
.hasOwnProperty(setName
)) continue;
209 var dataset
= this.datasets
[setName
];
210 for (var j
= 0; j
< dataset
.length
; j
++, i
++) {
211 var item
= dataset
[j
];
212 var xv
= parseFloat(item
[0]);
213 var yv
= parseFloat(item
[1]);
215 if (xv
== this.points
[i
].xval
&&
216 yv
== this.points
[i
].yval
) {
217 this.points
[i
].errorMinus
= parseFloat(item
[2]);
218 this.points
[i
].errorPlus
= parseFloat(item
[3]);
224 DygraphLayout
.prototype._evaluateAnnotations
= function() {
225 // Add the annotations to the point to which they belong.
226 // Make a map from (setName, xval) to annotation for quick lookups.
227 var annotations
= {};
228 for (var i
= 0; i
< this.annotations
.length
; i
++) {
229 var a
= this.annotations
[i
];
230 annotations
[a
.xval
+ "," + a
.series
] = a
;
233 this.annotated_points
= [];
234 for (var i
= 0; i
< this.points
.length
; i
++) {
235 var p
= this.points
[i
];
236 var k
= p
.xval
+ "," + p
.name
;
237 if (k
in annotations
) {
238 p
.annotation
= annotations
[k
];
239 this.annotated_points
.push(p
);
245 * Convenience function to remove all the data sets from a graph
247 DygraphLayout
.prototype.removeAllDatasets
= function() {
248 delete this.datasets
;
249 this.datasets
= new Array();
253 * Return a copy of the point at the indicated index, with its yval unstacked.
254 * @param int index of point in layout_.points
256 DygraphLayout
.prototype.unstackPointAtIndex
= function(idx
) {
257 var point
= this.points
[idx
];
259 // Clone the point since we modify it
260 var unstackedPoint
= {};
261 for (var i
in point
) {
262 unstackedPoint
[i
] = point
[i
];
265 if (!this.attr_("stackedGraph")) {
266 return unstackedPoint
;
269 // The unstacked yval is equal to the current yval minus the yval of the
270 // next point at the same xval.
271 for (var i
= idx
+1; i
< this.points
.length
; i
++) {
272 if (this.points
[i
].xval
== point
.xval
) {
273 unstackedPoint
.yval
-= this.points
[i
].yval
;
278 return unstackedPoint
;
282 * The DygraphCanvasRenderer class does the actual rendering of the chart onto
283 * a canvas. It's based on PlotKit.CanvasRenderer.
284 * @param {Object} element The canvas to attach to
285 * @param {Object} elementContext The 2d context of the canvas (injected so it
286 * can be mocked for testing.)
287 * @param {Layout} layout The DygraphLayout object for this graph.
289 DygraphCanvasRenderer
= function(dygraph
, element
, elementContext
, layout
) {
290 this.dygraph_
= dygraph
;
292 this.layout
= layout
;
293 this.element
= element
;
294 this.elementContext
= elementContext
;
295 this.container
= this.element
.parentNode
;
297 this.height
= this.element
.height
;
298 this.width
= this.element
.width
;
300 // --- check whether everything is ok before we return
301 if (!this.isIE
&& !(DygraphCanvasRenderer
.isSupported(this.element
)))
302 throw "Canvas is not supported.";
305 this.xlabels
= new Array();
306 this.ylabels
= new Array();
307 this.annotations
= new Array();
308 this.chartLabels
= {};
310 this.area
= this.computeArea_();
311 this.container
.style
.position
= "relative";
312 this.container
.style
.width
= this.width
+ "px";
314 // Set up a clipping area for the canvas (and the interaction canvas).
315 // This ensures that we don't overdraw.
316 var ctx
= this.dygraph_
.canvas_ctx_
;
318 ctx
.rect(this.area
.x
, this.area
.y
, this.area
.w
, this.area
.h
);
321 ctx
= this.dygraph_
.hidden_ctx_
;
323 ctx
.rect(this.area
.x
, this.area
.y
, this.area
.w
, this.area
.h
);
327 DygraphCanvasRenderer
.prototype.attr_
= function(x
) {
328 return this.dygraph_
.attr_(x
);
331 // Compute the box which the chart should be drawn in. This is the canvas's
332 // box, less space needed for axis and chart labels.
333 DygraphCanvasRenderer
.prototype.computeArea_
= function() {
335 // TODO(danvk): per-axis setting.
336 x
: this.attr_('yAxisLabelWidth') + 2 * this.attr_('axisTickSize'),
339 area
.w
= this.width
- area
.x
- this.attr_('rightGap');
340 area
.h
= this.height
- this.attr_('axisLabelFontSize') -
341 2 * this.attr_('axisTickSize');
343 // Shrink the drawing area to accomodate additional y-axes.
344 if (this.dygraph_
.numAxes() == 2) {
345 // TODO(danvk): per-axis setting.
346 area
.w
-= (this.attr_('yAxisLabelWidth') + 2 * this.attr_('axisTickSize'));
347 } else if (this.dygraph_
.numAxes() > 2) {
348 this.dygraph_
.error("Only two y-axes are supported at this time. (Trying " +
349 "to use " + this.dygraph_
.numAxes() + ")");
352 // Add space for chart labels: title, xlabel and ylabel.
353 if (this.attr_('title')) {
354 area
.h
-= this.attr_('titleHeight');
355 area
.y
+= this.attr_('titleHeight');
357 if (this.attr_('xlabel')) {
358 area
.h
-= this.attr_('xLabelHeight');
360 if (this.attr_('ylabel')) {
361 // It would make sense to shift the chart here to make room for the y-axis
362 // label, but the default yAxisLabelWidth is large enough that this results
363 // in overly-padded charts. The y-axis label should fit fine. If it
364 // doesn't, the yAxisLabelWidth option can be increased.
370 DygraphCanvasRenderer
.prototype.clear
= function() {
372 // VML takes a while to start up, so we just poll every this.IEDelay
374 if (this.clearDelay
) {
375 this.clearDelay
.cancel();
376 this.clearDelay
= null;
378 var context
= this.elementContext
;
381 // TODO(danvk): this is broken, since MochiKit.Async is gone.
382 this.clearDelay
= MochiKit
.Async
.wait(this.IEDelay
);
383 this.clearDelay
.addCallback(bind(this.clear
, this));
388 var context
= this.elementContext
;
389 context
.clearRect(0, 0, this.width
, this.height
);
391 for (var i
= 0; i
< this.xlabels
.length
; i
++) {
392 var el
= this.xlabels
[i
];
393 if (el
.parentNode
) el
.parentNode
.removeChild(el
);
395 for (var i
= 0; i
< this.ylabels
.length
; i
++) {
396 var el
= this.ylabels
[i
];
397 if (el
.parentNode
) el
.parentNode
.removeChild(el
);
399 for (var i
= 0; i
< this.annotations
.length
; i
++) {
400 var el
= this.annotations
[i
];
401 if (el
.parentNode
) el
.parentNode
.removeChild(el
);
403 for (var k
in this.chartLabels
) {
404 if (!this.chartLabels
.hasOwnProperty(k
)) continue;
405 var el
= this.chartLabels
[k
];
406 if (el
.parentNode
) el
.parentNode
.removeChild(el
);
408 this.xlabels
= new Array();
409 this.ylabels
= new Array();
410 this.annotations
= new Array();
411 this.chartLabels
= {};
415 DygraphCanvasRenderer
.isSupported
= function(canvasName
) {
418 if (typeof(canvasName
) == 'undefined' || canvasName
== null)
419 canvas
= document
.createElement("canvas");
422 var context
= canvas
.getContext("2d");
425 var ie
= navigator
.appVersion
.match(/MSIE (\d\.\d)/);
426 var opera
= (navigator
.userAgent
.toLowerCase().indexOf("opera") != -1);
427 if ((!ie
) || (ie
[1] < 6) || (opera
))
435 * Draw an X/Y grid on top of the existing plot
437 DygraphCanvasRenderer
.prototype.render
= function() {
438 // Draw the new X/Y grid
. Lines appear crisper when pixels are rounded to
439 // half-integers. This prevents them from drawing in two rows/cols.
440 var ctx
= this.elementContext
;
441 function halfUp(x
){return Math
.round(x
)+0.5};
442 function halfDown(y
){return Math
.round(y
)-0.5};
444 if (this.attr_('underlayCallback')) {
445 // NOTE: we pass the dygraph object to this callback twice to avoid breaking
446 // users who expect a deprecated form of this callback.
447 this.attr_('underlayCallback')(ctx
, this.area
, this.dygraph_
, this.dygraph_
);
450 if (this.attr_('drawYGrid')) {
451 var ticks
= this.layout
.yticks
;
453 ctx
.strokeStyle
= this.attr_('gridLineColor');
454 ctx
.lineWidth
= this.attr_('axisLineWidth');
455 for (var i
= 0; i
< ticks
.length
; i
++) {
456 // TODO(danvk): allow secondary axes to draw a grid, too.
457 if (ticks
[i
][0] != 0) continue;
458 var x
= halfUp(this.area
.x
);
459 var y
= halfDown(this.area
.y
+ ticks
[i
][1] * this.area
.h
);
462 ctx
.lineTo(x
+ this.area
.w
, y
);
468 if (this.attr_('drawXGrid')) {
469 var ticks
= this.layout
.xticks
;
471 ctx
.strokeStyle
= this.attr_('gridLineColor');
472 ctx
.lineWidth
= this.attr_('axisLineWidth');
473 for (var i
=0; i
<ticks
.length
; i
++) {
474 var x
= halfUp(this.area
.x
+ ticks
[i
][0] * this.area
.w
);
475 var y
= halfDown(this.area
.y
+ this.area
.h
);
478 ctx
.lineTo(x
, this.area
.y
);
484 // Do the ordinary rendering, as before
485 this._renderLineChart();
487 this._renderChartLabels();
488 this._renderAnnotations();
492 DygraphCanvasRenderer
.prototype._renderAxis
= function() {
493 if (!this.attr_('drawXAxis') && !this.attr_('drawYAxis')) return;
495 // Round pixels to half-integer boundaries for crisper drawing.
496 function halfUp(x
){return Math
.round(x
)+0.5};
497 function halfDown(y
){return Math
.round(y
)-0.5};
499 var context
= this.elementContext
;
502 position
: "absolute",
503 fontSize
: this.attr_('axisLabelFontSize') + "px",
505 color
: this.attr_('axisLabelColor'),
506 width
: this.attr_('axisLabelWidth') + "px",
509 var makeDiv
= function(txt
) {
510 var div
= document
.createElement("div");
511 for (var name
in labelStyle
) {
512 if (labelStyle
.hasOwnProperty(name
)) {
513 div
.style
[name
] = labelStyle
[name
];
516 div
.appendChild(document
.createTextNode(txt
));
522 context
.strokeStyle
= this.attr_('axisLineColor');
523 context
.lineWidth
= this.attr_('axisLineWidth');
525 if (this.attr_('drawYAxis')) {
526 if (this.layout
.yticks
&& this.layout
.yticks
.length
> 0) {
527 for (var i
= 0; i
< this.layout
.yticks
.length
; i
++) {
528 var tick
= this.layout
.yticks
[i
];
529 if (typeof(tick
) == "function") return;
532 if (tick
[0] == 1) { // right-side y-axis
533 x
= this.area
.x
+ this.area
.w
;
536 var y
= this.area
.y
+ tick
[1] * this.area
.h
;
538 context
.moveTo(halfUp(x
), halfDown(y
));
539 context
.lineTo(halfUp(x
- sgn
* this.attr_('axisTickSize'), halfDown(y
));
543 var label
= makeDiv(tick
[2]);
544 var top
= (y
- this.attr_('axisLabelFontSize') / 2);
545 if (top
< 0) top
= 0;
547 if (top
+ this.attr_('axisLabelFontSize') + 3 > this.height
) {
548 label
.style
.bottom
= "0px";
550 label
.style
.top
= top
+ "px";
553 label
.style
.left
= (this.area
.x
- this.attr_('yAxisLabelWidth') - this.attr_('axisTickSize')) + "px";
554 label
.style
.textAlign
= "right";
555 } else if (tick
[0] == 1) {
556 label
.style
.left
= (this.area
.x
+ this.area
.w
+
557 this.attr_('axisTickSize')) + "px";
558 label
.style
.textAlign
= "left";
560 label
.style
.width
= this.attr_('yAxisLabelWidth') + "px";
561 this.container
.appendChild(label
);
562 this.ylabels
.push(label
);
565 // The lowest tick on the y-axis often overlaps with the leftmost
566 // tick on the x-axis. Shift the bottom tick up a little bit to
567 // compensate if necessary.
568 var bottomTick
= this.ylabels
[0];
569 var fontSize
= this.attr_('axisLabelFontSize');
570 var bottom
= parseInt(bottomTick
.style
.top
) + fontSize
;
571 if (bottom
> this.height
- fontSize
) {
572 bottomTick
.style
.top
= (parseInt(bottomTick
.style
.top
) -
573 fontSize
/ 2) + "px";
577 // draw a vertical line on the left to separate the chart from the labels.
579 context
.moveTo(halfUp(this.area
.x
), halfDown(this.area
.y
));
580 context
.lineTo(halfUp(this.area
.x
), halfDown(this.area
.y
+ this.area
.h
));
584 // if there's a secondary y-axis, draw a vertical line for that, too.
585 if (this.dygraph_
.numAxes() == 2) {
587 context
.moveTo(halfDown(this.area
.x
+ this.area
.w
), halfDown(this.area
.y
));
588 context
.lineTo(halfDown(this.area
.x
+ this.area
.w
), halfDown(this.area
.y
+ this.area
.h
));
594 if (this.attr_('drawXAxis')) {
595 if (this.layout
.xticks
) {
596 for (var i
= 0; i
< this.layout
.xticks
.length
; i
++) {
597 var tick
= this.layout
.xticks
[i
];
598 if (typeof(dataset
) == "function") return;
600 var x
= this.area
.x
+ tick
[0] * this.area
.w
;
601 var y
= this.area
.y
+ this.area
.h
;
603 context
.moveTo(halfUp(x
), halfDown(y
));
604 context
.lineTo(halfUp(x
), halfDown(y
+ this.attr_('axisTickSize')));
608 var label
= makeDiv(tick
[1]);
609 label
.style
.textAlign
= "center";
610 label
.style
.top
= (y
+ this.attr_('axisTickSize')) + 'px';
612 var left
= (x
- this.attr_('axisLabelWidth')/2);
613 if (left
+ this.attr_('axisLabelWidth') > this.width
) {
614 left
= this.width
- this.attr_('xAxisLabelWidth');
615 label
.style
.textAlign
= "right";
619 label
.style
.textAlign
= "left";
622 label
.style
.left
= left
+ "px";
623 label
.style
.width
= this.attr_('xAxisLabelWidth') + "px";
624 this.container
.appendChild(label
);
625 this.xlabels
.push(label
);
630 context
.moveTo(halfUp(this.area
.x
), halfDown(this.area
.y
+ this.area
.h
));
631 context
.lineTo(halfUp(this.area
.x
+ this.area
.w
), halfDown(this.area
.y
+ this.area
.h
));
640 DygraphCanvasRenderer
.prototype._renderChartLabels
= function() {
641 // Generate divs for the chart title, xlabel and ylabel.
642 // Space for these divs has already been taken away from the charting area in
643 // the DygraphCanvasRenderer constructor.
644 if (this.attr_('title')) {
645 var div
= document
.createElement("div");
646 div
.style
.position
= 'absolute';
647 div
.style
.top
= '0px';
648 div
.style
.left
= this.area
.x
+ 'px';
649 div
.style
.width
= this.area
.w
+ 'px';
650 div
.style
.height
= this.attr_('titleHeight') + 'px';
651 div
.style
.textAlign
= 'center';
652 div
.style
.fontSize
= (this.attr_('titleHeight') - 8) + 'px';
653 div
.style
.fontWeight
= 'bold';
654 var class_div
= document
.createElement("div");
655 class_div
.className
= 'dygraph-label dygraph-title';
656 class_div
.innerHTML
= this.attr_('title');
657 div
.appendChild(class_div
);
658 this.container
.appendChild(div
);
659 this.chartLabels
.title
= div
;
662 if (this.attr_('xlabel')) {
663 var div
= document
.createElement("div");
664 div
.style
.position
= 'absolute';
665 div
.style
.bottom
= 0; // TODO(danvk): this is lazy. Calculate style.top.
666 div
.style
.left
= this.area
.x
+ 'px';
667 div
.style
.width
= this.area
.w
+ 'px';
668 div
.style
.height
= this.attr_('xLabelHeight') + 'px';
669 div
.style
.textAlign
= 'center';
670 div
.style
.fontSize
= (this.attr_('xLabelHeight') - 2) + 'px';
672 var class_div
= document
.createElement("div");
673 class_div
.className
= 'dygraph-label dygraph-xlabel';
674 class_div
.innerHTML
= this.attr_('xlabel');
675 div
.appendChild(class_div
);
676 this.container
.appendChild(div
);
677 this.chartLabels
.xlabel
= div
;
680 if (this.attr_('ylabel')) {
684 width
: this.attr_('yLabelWidth'),
687 // TODO(danvk): is this outer div actually necessary?
688 var div
= document
.createElement("div");
689 div
.style
.position
= 'absolute';
690 div
.style
.left
= box
.left
;
691 div
.style
.top
= box
.top
+ 'px';
692 div
.style
.width
= box
.width
+ 'px';
693 div
.style
.height
= box
.height
+ 'px';
694 div
.style
.fontSize
= (this.attr_('yLabelWidth') - 2) + 'px';
696 var inner_div
= document
.createElement("div");
697 inner_div
.style
.position
= 'absolute';
698 inner_div
.style
.width
= box
.height
+ 'px';
699 inner_div
.style
.height
= box
.width
+ 'px';
700 inner_div
.style
.top
= (box
.height
/ 2 - box.width / 2) + 'px';
701 inner_div
.style
.left
= (box
.width
/ 2 - box.height / 2) + 'px';
702 inner_div
.style
.textAlign
= 'center';
704 // CSS rotation is an HTML5 feature which is not standardized. Hence every
705 // browser has its own name for the CSS style.
706 inner_div
.style
.transform
= 'rotate(-90deg)'; // HTML5
707 inner_div
.style
.WebkitTransform
= 'rotate(-90deg)'; // Safari/Chrome
708 inner_div
.style
.MozTransform
= 'rotate(-90deg)'; // Firefox
709 inner_div
.style
.OTransform
= 'rotate(-90deg)'; // Opera
710 inner_div
.style
.msTransform
= 'rotate(-90deg)'; // IE9
712 if (typeof(document
.documentMode
) !== 'undefined' &&
713 document
.documentMode
< 9) {
714 // We're dealing w/ an old version of IE
, so we have to rotate the text
715 // using a BasicImage transform. This uses a different origin of rotation
716 // than HTML5 rotation (top left of div vs. its center).
717 inner_div
.style
.filter
=
718 'progid:DXImageTransform.Microsoft.BasicImage(rotation=3)';
719 inner_div
.style
.left
= '0px';
720 inner_div
.style
.top
= '0px';
723 var class_div
= document
.createElement("div");
724 class_div
.className
= 'dygraph-label dygraph-ylabel';
725 class_div
.innerHTML
= this.attr_('ylabel');
727 inner_div
.appendChild(class_div
);
728 div
.appendChild(inner_div
);
729 this.container
.appendChild(div
);
730 this.chartLabels
.ylabel
= div
;
735 DygraphCanvasRenderer
.prototype._renderAnnotations
= function() {
736 var annotationStyle
= {
737 "position": "absolute",
738 "fontSize": this.attr_('axisLabelFontSize') + "px",
743 var bindEvt
= function(eventName
, classEventName
, p
, self
) {
745 var a
= p
.annotation
;
746 if (a
.hasOwnProperty(eventName
)) {
747 a
[eventName
](a
, p
, self
.dygraph_
, e
);
748 } else if (self
.dygraph_
.attr_(classEventName
)) {
749 self
.dygraph_
.attr_(classEventName
)(a
, p
, self
.dygraph_
,e
);
754 // Get a list of point with annotations.
755 var points
= this.layout
.annotated_points
;
756 for (var i
= 0; i
< points
.length
; i
++) {
758 if (p
.canvasx
< this.area
.x
|| p
.canvasx
> this.area
.x
+ this.area
.w
) {
762 var a
= p
.annotation
;
764 if (a
.hasOwnProperty("tickHeight")) {
765 tick_height
= a
.tickHeight
;
768 var div
= document
.createElement("div");
769 for (var name
in annotationStyle
) {
770 if (annotationStyle
.hasOwnProperty(name
)) {
771 div
.style
[name
] = annotationStyle
[name
];
774 if (!a
.hasOwnProperty('icon')) {
775 div
.className
= "dygraphDefaultAnnotation";
777 if (a
.hasOwnProperty('cssClass')) {
778 div
.className
+= " " + a
.cssClass
;
781 var width
= a
.hasOwnProperty('width') ? a
.width
: 16;
782 var height
= a
.hasOwnProperty('height') ? a
.height
: 16;
783 if (a
.hasOwnProperty('icon')) {
784 var img
= document
.createElement("img");
788 div
.appendChild(img
);
789 } else if (p
.annotation
.hasOwnProperty('shortText')) {
790 div
.appendChild(document
.createTextNode(p
.annotation
.shortText
));
792 div
.style
.left
= (p
.canvasx
- width
/ 2) + "px";
793 if (a
.attachAtBottom
) {
794 div
.style
.top
= (this.area
.h
- height
- tick_height
) + "px";
796 div
.style
.top
= (p
.canvasy
- height
- tick_height
) + "px";
798 div
.style
.width
= width
+ "px";
799 div
.style
.height
= height
+ "px";
800 div
.title
= p
.annotation
.text
;
801 div
.style
.color
= this.colors
[p
.name
];
802 div
.style
.borderColor
= this.colors
[p
.name
];
805 Dygraph
.addEvent(div
, 'click',
806 bindEvt('clickHandler', 'annotationClickHandler', p
, this));
807 Dygraph
.addEvent(div
, 'mouseover',
808 bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p
, this));
809 Dygraph
.addEvent(div
, 'mouseout',
810 bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p
, this));
811 Dygraph
.addEvent(div
, 'dblclick',
812 bindEvt('dblClickHandler', 'annotationDblClickHandler', p
, this));
814 this.container
.appendChild(div
);
815 this.annotations
.push(div
);
817 var ctx
= this.elementContext
;
818 ctx
.strokeStyle
= this.colors
[p
.name
];
820 if (!a
.attachAtBottom
) {
821 ctx
.moveTo(p
.canvasx
, p
.canvasy
);
822 ctx
.lineTo(p
.canvasx
, p
.canvasy
- 2 - tick_height
);
824 ctx
.moveTo(p
.canvasx
, this.area
.h
);
825 ctx
.lineTo(p
.canvasx
, this.area
.h
- 2 - tick_height
);
834 * Overrides the CanvasRenderer method to draw error bars
836 DygraphCanvasRenderer
.prototype._renderLineChart
= function() {
837 // TODO(danvk): use this.attr_ for many of these.
838 var context
= this.elementContext
;
839 var colorCount
= this.options
.colorScheme
.length
;
840 var colorScheme
= this.options
.colorScheme
;
841 var fillAlpha
= this.attr_('fillAlpha');
842 var errorBars
= this.attr_("errorBars");
843 var fillGraph
= this.attr_("fillGraph");
844 var stackedGraph
= this.attr_("stackedGraph");
845 var stepPlot
= this.attr_("stepPlot");
848 for (var name
in this.layout
.datasets
) {
849 if (this.layout
.datasets
.hasOwnProperty(name
)) {
853 var setCount
= setNames
.length
;
856 for (var i
= 0; i
< setCount
; i
++) {
857 this.colors
[setNames
[i
]] = colorScheme
[i
% colorCount
];
862 for (var i
= 0; i
< this.layout
.points
.length
; i
++) {
863 var point
= this.layout
.points
[i
];
864 point
.canvasx
= this.area
.w
* point
.x
+ this.area
.x
;
865 point
.canvasy
= this.area
.h
* point
.y
+ this.area
.y
;
872 this.dygraph_
.warn("Can't use fillGraph option with error bars");
875 for (var i
= 0; i
< setCount
; i
++) {
876 var setName
= setNames
[i
];
877 var axis
= this.dygraph_
.axisPropertiesForSeries(setName
);
878 var color
= this.colors
[setName
];
880 // setup graphics context
884 var prevYs
= [-1, -1];
885 var yscale
= axis
.yscale
;
886 // should be same color as the lines but only 15% opaque.
887 var rgb
= new RGBColor(color
);
888 var err_color
= 'rgba(' + rgb
.r
+ ',' + rgb
.g
+ ',' + rgb
.b
+ ',' +
890 ctx
.fillStyle
= err_color
;
892 for (var j
= 0; j
< this.layout
.points
.length
; j
++) {
893 var point
= this.layout
.points
[j
];
894 if (point
.name
== setName
) {
895 if (!Dygraph
.isOK(point
.y
)) {
902 var newYs
= [ prevY
- point
.errorPlus
* yscale
,
903 prevY
+ point
.errorMinus
* yscale
];
906 var newYs
= [ point
.y
- point
.errorPlus
* yscale
,
907 point
.y
+ point
.errorMinus
* yscale
];
909 newYs
[0] = this.area
.h
* newYs
[0] + this.area
.y
;
910 newYs
[1] = this.area
.h
* newYs
[1] + this.area
.y
;
913 ctx
.moveTo(prevX
, newYs
[0]);
915 ctx
.moveTo(prevX
, prevYs
[0]);
917 ctx
.lineTo(point
.canvasx
, newYs
[0]);
918 ctx
.lineTo(point
.canvasx
, newYs
[1]);
920 ctx
.lineTo(prevX
, newYs
[1]);
922 ctx
.lineTo(prevX
, prevYs
[1]);
927 prevX
= point
.canvasx
;
932 } else if (fillGraph
) {
933 var baseline
= [] // for stacked graphs: baseline for filling
935 // process sets in reverse order (needed for stacked graphs)
936 for (var i
= setCount
- 1; i
>= 0; i
--) {
937 var setName
= setNames
[i
];
938 var color
= this.colors
[setName
];
939 var axis
= this.dygraph_
.axisPropertiesForSeries(setName
);
940 var axisY
= 1.0 + axis
.minyval
* axis
.yscale
;
941 if (axisY
< 0.0) axisY
= 0.0;
942 else if (axisY
> 1.0) axisY
= 1.0;
943 axisY
= this.area
.h
* axisY
+ this.area
.y
;
945 // setup graphics context
948 var prevYs
= [-1, -1];
949 var yscale
= axis
.yscale
;
950 // should be same color as the lines but only 15% opaque.
951 var rgb
= new RGBColor(color
);
952 var err_color
= 'rgba(' + rgb
.r
+ ',' + rgb
.g
+ ',' + rgb
.b
+ ',' +
954 ctx
.fillStyle
= err_color
;
956 for (var j
= 0; j
< this.layout
.points
.length
; j
++) {
957 var point
= this.layout
.points
[j
];
958 if (point
.name
== setName
) {
959 if (!Dygraph
.isOK(point
.y
)) {
965 lastY
= baseline
[point
.canvasx
];
966 if (lastY
=== undefined
) lastY
= axisY
;
967 baseline
[point
.canvasx
] = point
.canvasy
;
968 newYs
= [ point
.canvasy
, lastY
];
970 newYs
= [ point
.canvasy
, axisY
];
973 ctx
.moveTo(prevX
, prevYs
[0]);
975 ctx
.lineTo(point
.canvasx
, prevYs
[0]);
977 ctx
.lineTo(point
.canvasx
, newYs
[0]);
979 ctx
.lineTo(point
.canvasx
, newYs
[1]);
980 ctx
.lineTo(prevX
, prevYs
[1]);
984 prevX
= point
.canvasx
;
991 for (var i
= 0; i
< setCount
; i
++) {
992 var setName
= setNames
[i
];
993 var color
= this.colors
[setName
];
994 var strokeWidth
= this.dygraph_
.attr_("strokeWidth", setName
);
996 // setup graphics context
998 var point
= this.layout
.points
[0];
999 var pointSize
= this.dygraph_
.attr_("pointSize", setName
);
1000 var prevX
= null, prevY
= null;
1001 var drawPoints
= this.dygraph_
.attr_("drawPoints", setName
);
1002 var points
= this.layout
.points
;
1003 for (var j
= 0; j
< points
.length
; j
++) {
1004 var point
= points
[j
];
1005 if (point
.name
== setName
) {
1006 if (!Dygraph
.isOK(point
.canvasy
)) {
1007 if (stepPlot
&& prevX
!= null) {
1008 // Draw a horizontal line to the start of the missing data
1010 ctx
.strokeStyle
= color
;
1011 ctx
.lineWidth
= this.attr_('strokeWidth');
1012 ctx
.moveTo(prevX
, prevY
);
1013 ctx
.lineTo(point
.canvasx
, prevY
);
1016 // this will make us move to the next point, not draw a line to it.
1017 prevX
= prevY
= null;
1019 // A point is "isolated" if it is non-null but both the previous
1020 // and next points are null.
1021 var isIsolated
= (!prevX
&& (j
== points
.length
- 1 ||
1022 !Dygraph
.isOK(points
[j
+1].canvasy
)));
1025 prevX
= point
.canvasx
;
1026 prevY
= point
.canvasy
;
1028 // TODO(danvk): figure out why this conditional is necessary.
1031 ctx
.strokeStyle
= color
;
1032 ctx
.lineWidth
= strokeWidth
;
1033 ctx
.moveTo(prevX
, prevY
);
1035 ctx
.lineTo(point
.canvasx
, prevY
);
1037 prevX
= point
.canvasx
;
1038 prevY
= point
.canvasy
;
1039 ctx
.lineTo(prevX
, prevY
);
1044 if (drawPoints
|| isIsolated
) {
1046 ctx
.fillStyle
= color
;
1047 ctx
.arc(point
.canvasx
, point
.canvasy
, pointSize
,
1048 0, 2 * Math
.PI
, false);