3 * Copyright 2011 Paul Felix (paul.eric.felix@gmail.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
6 /*global Dygraph:false,TouchEvent:false */
9 * @fileoverview This file contains the RangeSelector plugin used to provide
10 * a timeline range selector widget for dygraphs.
13 Dygraph
.Plugins
.RangeSelector
= (function() {
15 /*jshint globalstrict: true */
16 /*global Dygraph:false */
19 var rangeSelector
= function() {
20 this.isIE_
= /MSIE/.test(navigator
.userAgent
) && !window
.opera
;
21 this.hasTouchInterface_
= typeof(TouchEvent
) != 'undefined';
22 this.isMobileDevice_
= /mobile|android/gi.test(navigator
.appVersion
);
23 this.interfaceCreated_
= false;
26 rangeSelector
.prototype.toString
= function() {
27 return "RangeSelector Plugin";
30 rangeSelector
.prototype.activate
= function(dygraph
) {
31 this.dygraph_
= dygraph
;
32 this.isUsingExcanvas_
= dygraph
.isUsingExcanvas_
;
33 if (this.getOption_('showRangeSelector')) {
34 this.createInterface_();
37 layout
: this.reserveSpace_
,
38 predraw
: this.renderStaticLayer_
,
39 didDrawChart
: this.renderInteractiveLayer_
43 rangeSelector
.prototype.destroy
= function() {
44 this.bgcanvas_
= null;
45 this.fgcanvas_
= null;
46 this.leftZoomHandle_
= null;
47 this.rightZoomHandle_
= null;
48 this.iePanOverlay_
= null;
51 //------------------------------------------------------------------
53 //------------------------------------------------------------------
55 rangeSelector
.prototype.getOption_
= function(name
) {
56 return this.dygraph_
.getOption(name
);
59 rangeSelector
.prototype.setDefaultOption_
= function(name
, value
) {
60 return this.dygraph_
.attrs_
[name
] = value
;
65 * Creates the range selector elements and adds them to the graph.
67 rangeSelector
.prototype.createInterface_
= function() {
68 this.createCanvases_();
69 if (this.isUsingExcanvas_
) {
70 this.createIEPanOverlay_();
72 this.createZoomHandles_();
73 this.initInteraction_();
75 // Range selector and animatedZooms have a bad interaction. See issue 359.
76 if (this.getOption_('animatedZooms')) {
77 this.dygraph_
.warn('Animated zooms and range selector are not compatible; disabling animatedZooms.');
78 this.dygraph_
.updateOptions({animatedZooms
: false}, true);
81 this.interfaceCreated_
= true;
87 * Adds the range selector to the graph.
89 rangeSelector
.prototype.addToGraph_
= function() {
90 var graphDiv
= this.graphDiv_
= this.dygraph_
.graphDiv
;
91 graphDiv
.appendChild(this.bgcanvas_
);
92 graphDiv
.appendChild(this.fgcanvas_
);
93 graphDiv
.appendChild(this.leftZoomHandle_
);
94 graphDiv
.appendChild(this.rightZoomHandle_
);
99 * Removes the range selector from the graph.
101 rangeSelector
.prototype.removeFromGraph_
= function() {
102 var graphDiv
= this.graphDiv_
;
103 graphDiv
.removeChild(this.bgcanvas_
);
104 graphDiv
.removeChild(this.fgcanvas_
);
105 graphDiv
.removeChild(this.leftZoomHandle_
);
106 graphDiv
.removeChild(this.rightZoomHandle_
);
107 this.graphDiv_
= null;
112 * Called by Layout to allow range selector to reserve its space.
114 rangeSelector
.prototype.reserveSpace_
= function(e
) {
115 if (this.getOption_('showRangeSelector')) {
116 e
.reserveSpaceBottom(this.getOption_('rangeSelectorHeight') + 4);
122 * Renders the static portion of the range selector at the predraw stage.
124 rangeSelector
.prototype.renderStaticLayer_
= function() {
125 if (!this.updateVisibility_()) {
129 this.drawStaticLayer_();
134 * Renders the interactive portion of the range selector after the chart has been drawn.
136 rangeSelector
.prototype.renderInteractiveLayer_
= function() {
137 if (!this.updateVisibility_() || this.isChangingRange_
) {
140 this.placeZoomHandles_();
141 this.drawInteractiveLayer_();
146 * Check to see if the range selector is enabled/disabled and update visibility accordingly.
148 rangeSelector
.prototype.updateVisibility_
= function() {
149 var enabled
= this.getOption_('showRangeSelector');
151 if (!this.interfaceCreated_
) {
152 this.createInterface_();
153 } else if (!this.graphDiv_
|| !this.graphDiv_
.parentNode
) {
156 } else if (this.graphDiv_
) {
157 this.removeFromGraph_();
158 var dygraph
= this.dygraph_
;
159 setTimeout(function() { dygraph
.width_
= 0; dygraph
.resize(); }, 1);
166 * Resizes the range selector.
168 rangeSelector
.prototype.resize_
= function() {
169 function setElementRect(canvas
, rect
) {
170 canvas
.style
.top
= rect
.y
+ 'px';
171 canvas
.style
.left
= rect
.x
+ 'px';
172 canvas
.width
= rect
.w
;
173 canvas
.height
= rect
.h
;
174 canvas
.style
.width
= canvas
.width
+ 'px'; // for IE
175 canvas
.style
.height
= canvas
.height
+ 'px'; // for IE
178 var plotArea
= this.dygraph_
.layout_
.getPlotArea();
179 var xAxisLabelHeight
= this.getOption_('xAxisHeight') || (this.getOption_('axisLabelFontSize') + 2 * this.getOption_('axisTickSize'));
182 y
: plotArea
.y
+ plotArea
.h
+ xAxisLabelHeight
+ 4,
184 h
: this.getOption_('rangeSelectorHeight')
187 setElementRect(this.bgcanvas_
, this.canvasRect_
);
188 setElementRect(this.fgcanvas_
, this.canvasRect_
);
193 * Creates the background and foreground canvases.
195 rangeSelector
.prototype.createCanvases_
= function() {
196 this.bgcanvas_
= Dygraph
.createCanvas();
197 this.bgcanvas_
.className
= 'dygraph-rangesel-bgcanvas';
198 this.bgcanvas_
.style
.position
= 'absolute';
199 this.bgcanvas_
.style
.zIndex
= 9;
200 this.bgcanvas_ctx_
= Dygraph
.getContext(this.bgcanvas_
);
202 this.fgcanvas_
= Dygraph
.createCanvas();
203 this.fgcanvas_
.className
= 'dygraph-rangesel-fgcanvas';
204 this.fgcanvas_
.style
.position
= 'absolute';
205 this.fgcanvas_
.style
.zIndex
= 9;
206 this.fgcanvas_
.style
.cursor
= 'default';
207 this.fgcanvas_ctx_
= Dygraph
.getContext(this.fgcanvas_
);
212 * Creates overlay divs for IE/Excanvas so that mouse events are handled properly.
214 rangeSelector
.prototype.createIEPanOverlay_
= function() {
215 this.iePanOverlay_
= document
.createElement("div");
216 this.iePanOverlay_
.style
.position
= 'absolute';
217 this.iePanOverlay_
.style
.backgroundColor
= 'white';
218 this.iePanOverlay_
.style
.filter
= 'alpha(opacity=0)';
219 this.iePanOverlay_
.style
.display
= 'none';
220 this.iePanOverlay_
.style
.cursor
= 'move';
221 this.fgcanvas_
.appendChild(this.iePanOverlay_
);
226 * Creates the zoom handle elements.
228 rangeSelector
.prototype.createZoomHandles_
= function() {
229 var img
= new Image();
230 img
.className
= 'dygraph-rangesel-zoomhandle';
231 img
.style
.position
= 'absolute';
232 img
.style
.zIndex
= 10;
233 img
.style
.visibility
= 'hidden'; // Initially hidden so they don't show up in the wrong place.
234 img
.style
.cursor
= 'col-resize';
236 if (/MSIE 7/.test(navigator
.userAgent
)) { // IE7 doesn't support embedded src data.
239 img
.style
.backgroundColor
= 'white';
240 img
.style
.border
= '1px solid #333333'; // Just show box in IE7.
244 img
.src
= 'data:image/png;base64,' +
245 'iVBORw0KGgoAAAANSUhEUgAAAAkAAAAQCAYAAADESFVDAAAAAXNSR0IArs4c6QAAAAZiS0dEANAA' +
246 'zwDP4Z7KegAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAAd0SU1FB9sHGw0cMqdt1UwAAAAZdEVYdENv' +
247 'bW1lbnQAQ3JlYXRlZCB3aXRoIEdJTVBXgQ4XAAAAaElEQVQoz+3SsRFAQBCF4Z9WJM8KCDVwownl' +
248 '6YXsTmCUsyKGkZzcl7zkz3YLkypgAnreFmDEpHkIwVOMfpdi9CEEN2nGpFdwD03yEqDtOgCaun7s' +
249 'qSTDH32I1pQA2Pb9sZecAxc5r3IAb21d6878xsAAAAAASUVORK5CYII=';
252 if (this.isMobileDevice_
) {
257 this.leftZoomHandle_
= img
;
258 this.rightZoomHandle_
= img
.cloneNode(false);
263 * Sets up the interaction for the range selector.
265 rangeSelector
.prototype.initInteraction_
= function() {
267 var topElem
= this.isIE_
? document
: window
;
270 var isZooming
= false;
271 var isPanning
= false;
272 var dynamic
= !this.isMobileDevice_
&& !this.isUsingExcanvas_
;
274 // We cover iframes during mouse interactions. See comments in
275 // dygraph-utils.js for more info on why this is a good idea.
276 var tarp
= new Dygraph
.IFrameTarp();
278 // functions, defined below. Defining them this way (rather than with
279 // "function foo() {...}" makes JSHint happy.
280 var toXDataWindow
, onZoomStart
, onZoom
, onZoomEnd
, doZoom
, isMouseInPanZone
,
281 onPanStart
, onPan
, onPanEnd
, doPan
, onCanvasMouseMove
, applyBrowserZoomLevel
;
283 // Touch event functions
284 var onZoomHandleTouchEvent
, onCanvasTouchEvent
, addTouchEvents
;
286 toXDataWindow
= function(zoomHandleStatus
) {
287 var xDataLimits
= self
.dygraph_
.xAxisExtremes();
288 var fact
= (xDataLimits
[1] - xDataLimits
[0])/self
.canvasRect_
.w
;
289 var xDataMin
= xDataLimits
[0] + (zoomHandleStatus
.leftHandlePos
- self
.canvasRect_
.x
)*fact
;
290 var xDataMax
= xDataLimits
[0] + (zoomHandleStatus
.rightHandlePos
- self
.canvasRect_
.x
)*fact
;
291 return [xDataMin
, xDataMax
];
294 applyBrowserZoomLevel
= function(delX
) {
295 var zoom
= window
.outerWidth
/document
.documentElement
.clientWidth
;
303 onZoomStart
= function(e
) {
304 Dygraph
.cancelEvent(e
);
307 handle
= e
.target
? e
.target
: e
.srcElement
;
308 self
.dygraph_
.addEvent(topElem
, 'mousemove', onZoom
);
309 self
.dygraph_
.addEvent(topElem
, 'mouseup', onZoomEnd
);
310 self
.fgcanvas_
.style
.cursor
= 'col-resize';
315 onZoom
= function(e
) {
319 Dygraph
.cancelEvent(e
);
320 var delX
= e
.screenX
- xLast
;
321 if (Math
.abs(delX
) < 4 || e
.screenX
=== 0) {
322 // First iPad move event seems to have screenX = 0
326 delX
= applyBrowserZoomLevel(delX
);
329 var zoomHandleStatus
= self
.getZoomHandleStatus_();
331 if (handle
== self
.leftZoomHandle_
) {
332 newPos
= zoomHandleStatus
.leftHandlePos
+ delX
;
333 newPos
= Math
.min(newPos
, zoomHandleStatus
.rightHandlePos
- handle
.width
- 3);
334 newPos
= Math
.max(newPos
, self
.canvasRect_
.x
);
336 newPos
= zoomHandleStatus
.rightHandlePos
+ delX
;
337 newPos
= Math
.min(newPos
, self
.canvasRect_
.x
+ self
.canvasRect_
.w
);
338 newPos
= Math
.max(newPos
, zoomHandleStatus
.leftHandlePos
+ handle
.width
+ 3);
340 var halfHandleWidth
= handle
.width
/2;
341 handle
.style
.left
= (newPos
- halfHandleWidth
) + 'px';
342 self
.drawInteractiveLayer_();
344 // Zoom on the fly (if not using excanvas).
351 onZoomEnd
= function(e
) {
357 Dygraph
.removeEvent(topElem
, 'mousemove', onZoom
);
358 Dygraph
.removeEvent(topElem
, 'mouseup', onZoomEnd
);
359 self
.fgcanvas_
.style
.cursor
= 'default';
361 // If using excanvas, Zoom now.
368 doZoom
= function() {
370 var zoomHandleStatus
= self
.getZoomHandleStatus_();
371 self
.isChangingRange_
= true;
372 if (!zoomHandleStatus
.isZoomed
) {
373 self
.dygraph_
.resetZoom();
375 var xDataWindow
= toXDataWindow(zoomHandleStatus
);
376 self
.dygraph_
.doZoomXDates_(xDataWindow
[0], xDataWindow
[1]);
379 self
.isChangingRange_
= false;
383 isMouseInPanZone
= function(e
) {
384 if (self
.isUsingExcanvas_
) {
385 return e
.srcElement
== self
.iePanOverlay_
;
387 var rect
= self
.leftZoomHandle_
.getBoundingClientRect();
388 var leftHandleClientX
= rect
.left
+ rect
.width
/2;
389 rect
= self
.rightZoomHandle_
.getBoundingClientRect();
390 var rightHandleClientX
= rect
.left
+ rect
.width
/2;
391 return (e
.clientX
> leftHandleClientX
&& e
.clientX
< rightHandleClientX
);
395 onPanStart
= function(e
) {
396 if (!isPanning
&& isMouseInPanZone(e
) && self
.getZoomHandleStatus_().isZoomed
) {
397 Dygraph
.cancelEvent(e
);
400 self
.dygraph_
.addEvent(topElem
, 'mousemove', onPan
);
401 self
.dygraph_
.addEvent(topElem
, 'mouseup', onPanEnd
);
407 onPan
= function(e
) {
411 Dygraph
.cancelEvent(e
);
413 var delX
= e
.screenX
- xLast
;
414 if (Math
.abs(delX
) < 4) {
418 delX
= applyBrowserZoomLevel(delX
);
421 var zoomHandleStatus
= self
.getZoomHandleStatus_();
422 var leftHandlePos
= zoomHandleStatus
.leftHandlePos
;
423 var rightHandlePos
= zoomHandleStatus
.rightHandlePos
;
424 var rangeSize
= rightHandlePos
- leftHandlePos
;
425 if (leftHandlePos
+ delX
<= self
.canvasRect_
.x
) {
426 leftHandlePos
= self
.canvasRect_
.x
;
427 rightHandlePos
= leftHandlePos
+ rangeSize
;
428 } else if (rightHandlePos
+ delX
>= self
.canvasRect_
.x
+ self
.canvasRect_
.w
) {
429 rightHandlePos
= self
.canvasRect_
.x
+ self
.canvasRect_
.w
;
430 leftHandlePos
= rightHandlePos
- rangeSize
;
432 leftHandlePos
+= delX
;
433 rightHandlePos
+= delX
;
435 var halfHandleWidth
= self
.leftZoomHandle_
.width
/2;
436 self
.leftZoomHandle_
.style
.left
= (leftHandlePos
- halfHandleWidth
) + 'px';
437 self
.rightZoomHandle_
.style
.left
= (rightHandlePos
- halfHandleWidth
) + 'px';
438 self
.drawInteractiveLayer_();
440 // Do pan on the fly (if not using excanvas).
447 onPanEnd
= function(e
) {
452 Dygraph
.removeEvent(topElem
, 'mousemove', onPan
);
453 Dygraph
.removeEvent(topElem
, 'mouseup', onPanEnd
);
454 // If using excanvas, do pan now.
463 self
.isChangingRange_
= true;
464 self
.dygraph_
.dateWindow_
= toXDataWindow(self
.getZoomHandleStatus_());
465 self
.dygraph_
.drawGraph_(false);
467 self
.isChangingRange_
= false;
471 onCanvasMouseMove
= function(e
) {
472 if (isZooming
|| isPanning
) {
475 var cursor
= isMouseInPanZone(e
) ? 'move' : 'default';
476 if (cursor
!= self
.fgcanvas_
.style
.cursor
) {
477 self
.fgcanvas_
.style
.cursor
= cursor
;
481 onZoomHandleTouchEvent
= function(e
) {
482 if (e
.type
== 'touchstart' && e
.targetTouches
.length
== 1) {
483 if (onZoomStart(e
.targetTouches
[0])) {
484 Dygraph
.cancelEvent(e
);
486 } else if (e
.type
== 'touchmove' && e
.targetTouches
.length
== 1) {
487 if (onZoom(e
.targetTouches
[0])) {
488 Dygraph
.cancelEvent(e
);
495 onCanvasTouchEvent
= function(e
) {
496 if (e
.type
== 'touchstart' && e
.targetTouches
.length
== 1) {
497 if (onPanStart(e
.targetTouches
[0])) {
498 Dygraph
.cancelEvent(e
);
500 } else if (e
.type
== 'touchmove' && e
.targetTouches
.length
== 1) {
501 if (onPan(e
.targetTouches
[0])) {
502 Dygraph
.cancelEvent(e
);
509 addTouchEvents
= function(elem
, fn
) {
510 var types
= ['touchstart', 'touchend', 'touchmove', 'touchcancel'];
511 for (var i
= 0; i
< types
.length
; i
++) {
512 self
.dygraph_
.addEvent(elem
, types
[i
], fn
);
516 this.setDefaultOption_('interactionModel', Dygraph
.Interaction
.dragIsPanInteractionModel
);
517 this.setDefaultOption_('panEdgeFraction', 0.0001);
519 var dragStartEvent
= window
.opera
? 'mousedown' : 'dragstart';
520 this.dygraph_
.addEvent(this.leftZoomHandle_
, dragStartEvent
, onZoomStart
);
521 this.dygraph_
.addEvent(this.rightZoomHandle_
, dragStartEvent
, onZoomStart
);
523 if (this.isUsingExcanvas_
) {
524 this.dygraph_
.addEvent(this.iePanOverlay_
, 'mousedown', onPanStart
);
526 this.dygraph_
.addEvent(this.fgcanvas_
, 'mousedown', onPanStart
);
527 this.dygraph_
.addEvent(this.fgcanvas_
, 'mousemove', onCanvasMouseMove
);
531 if (this.hasTouchInterface_
) {
532 addTouchEvents(this.leftZoomHandle_
, onZoomHandleTouchEvent
);
533 addTouchEvents(this.rightZoomHandle_
, onZoomHandleTouchEvent
);
534 addTouchEvents(this.fgcanvas_
, onCanvasTouchEvent
);
540 * Draws the static layer in the background canvas.
542 rangeSelector
.prototype.drawStaticLayer_
= function() {
543 var ctx
= this.bgcanvas_ctx_
;
544 ctx
.clearRect(0, 0, this.canvasRect_
.w
, this.canvasRect_
.h
);
546 this.drawMiniPlot_();
552 this.bgcanvas_ctx_
.lineWidth
= 1;
553 ctx
.strokeStyle
= 'gray';
555 ctx
.moveTo(margin
, margin
);
556 ctx
.lineTo(margin
, this.canvasRect_
.h
-margin
);
557 ctx
.lineTo(this.canvasRect_
.w
-margin
, this.canvasRect_
.h
-margin
);
558 ctx
.lineTo(this.canvasRect_
.w
-margin
, margin
);
565 * Draws the mini plot in the background canvas.
567 rangeSelector
.prototype.drawMiniPlot_
= function() {
568 var fillStyle
= this.getOption_('rangeSelectorPlotFillColor');
569 var strokeStyle
= this.getOption_('rangeSelectorPlotStrokeColor');
570 if (!fillStyle
&& !strokeStyle
) {
574 var stepPlot
= this.getOption_('stepPlot');
576 var combinedSeriesData
= this.computeCombinedSeriesAndLimits_();
577 var yRange
= combinedSeriesData
.yMax
- combinedSeriesData
.yMin
;
579 // Draw the mini plot.
580 var ctx
= this.bgcanvas_ctx_
;
583 var xExtremes
= this.dygraph_
.xAxisExtremes();
584 var xRange
= Math
.max(xExtremes
[1] - xExtremes
[0], 1.e
-30);
585 var xFact
= (this.canvasRect_
.w
- margin
)/xRange
;
586 var yFact
= (this.canvasRect_
.h
- margin
)/yRange
;
587 var canvasWidth
= this.canvasRect_
.w
- margin
;
588 var canvasHeight
= this.canvasRect_
.h
- margin
;
590 var prevX
= null, prevY
= null;
593 ctx
.moveTo(margin
, canvasHeight
);
594 for (var i
= 0; i
< combinedSeriesData
.data
.length
; i
++) {
595 var dataPoint
= combinedSeriesData
.data
[i
];
596 var x
= ((dataPoint
[0] !== null) ? ((dataPoint
[0] - xExtremes
[0])*xFact
) : NaN
);
597 var y
= ((dataPoint
[1] !== null) ? (canvasHeight
- (dataPoint
[1] - combinedSeriesData
.yMin
)*yFact
) : NaN
);
598 if (isFinite(x
) && isFinite(y
)) {
600 ctx
.lineTo(x
, canvasHeight
);
603 ctx
.lineTo(x
, prevY
);
612 ctx
.lineTo(x
, prevY
);
613 ctx
.lineTo(x
, canvasHeight
);
616 ctx
.lineTo(prevX
, canvasHeight
);
619 prevX
= prevY
= null;
622 ctx
.lineTo(canvasWidth
, canvasHeight
);
626 var lingrad
= this.bgcanvas_ctx_
.createLinearGradient(0, 0, 0, canvasHeight
);
627 lingrad
.addColorStop(0, 'white');
628 lingrad
.addColorStop(1, fillStyle
);
629 this.bgcanvas_ctx_
.fillStyle
= lingrad
;
634 this.bgcanvas_ctx_
.strokeStyle
= strokeStyle
;
635 this.bgcanvas_ctx_
.lineWidth
= 1.5;
642 * Computes and returns the combinded series data along with min/max for the mini plot.
643 * @return {Object} An object containing combinded series array, ymin, ymax.
645 rangeSelector
.prototype.computeCombinedSeriesAndLimits_
= function() {
646 var data
= this.dygraph_
.rawData_
;
647 var logscale
= this.getOption_('logscale');
649 // Create a combined series (average of all series values).
650 var combinedSeries
= [];
657 // Find out if data has multiple values per datapoint.
658 // Go to first data point that actually has values (see http://code.google.com/p/dygraphs/issues/detail
?id
=246)
659 for (i
= 0; i
< data
.length
; i
++) {
660 if (data
[i
].length
> 1 && data
[i
][1] !== null) {
661 mutipleValues
= typeof data
[i
][1] != 'number';
665 for (k
= 0; k
< data
[i
][1].length
; k
++) {
674 for (i
= 0; i
< data
.length
; i
++) {
675 var dataPoint
= data
[i
];
679 for (k
= 0; k
< sum
.length
; k
++) {
680 sum
[k
] = count
[k
] = 0;
686 for (j
= 1; j
< dataPoint
.length
; j
++) {
687 if (this.dygraph_
.visibility()[j
-1]) {
690 for (k
= 0; k
< sum
.length
; k
++) {
692 if (y
=== null || isNaN(y
)) continue;
698 if (y
=== null || isNaN(y
)) continue;
706 for (k
= 0; k
< sum
.length
; k
++) {
714 combinedSeries
.push([xVal
, yVal
]);
717 // Account for roll period, fractions.
718 combinedSeries
= this.dygraph_
.rollingAverage(combinedSeries
, this.dygraph_
.rollPeriod_
);
720 if (typeof combinedSeries
[0][1] != 'number') {
721 for (i
= 0; i
< combinedSeries
.length
; i
++) {
722 yVal
= combinedSeries
[i
][1];
723 combinedSeries
[i
][1] = yVal
[0];
727 // Compute the y range.
728 var yMin
= Number
.MAX_VALUE
;
729 var yMax
= -Number
.MAX_VALUE
;
730 for (i
= 0; i
< combinedSeries
.length
; i
++) {
731 yVal
= combinedSeries
[i
][1];
732 if (yVal
!== null && isFinite(yVal
) && (!logscale
|| yVal
> 0)) {
733 yMin
= Math
.min(yMin
, yVal
);
734 yMax
= Math
.max(yMax
, yVal
);
738 // Convert Y data to log scale if needed.
739 // Also, expand the Y range to compress the mini plot a little.
740 var extraPercent
= 0.25;
742 yMax
= Dygraph
.log10(yMax
);
743 yMax
+= yMax
*extraPercent
;
744 yMin
= Dygraph
.log10(yMin
);
745 for (i
= 0; i
< combinedSeries
.length
; i
++) {
746 combinedSeries
[i
][1] = Dygraph
.log10(combinedSeries
[i
][1]);
750 var yRange
= yMax
- yMin
;
751 if (yRange
<= Number
.MIN_VALUE
) {
752 yExtra
= yMax
*extraPercent
;
754 yExtra
= yRange
*extraPercent
;
760 return {data
: combinedSeries
, yMin
: yMin
, yMax
: yMax
};
765 * Places the zoom handles in the proper position based on the current X data window.
767 rangeSelector
.prototype.placeZoomHandles_
= function() {
768 var xExtremes
= this.dygraph_
.xAxisExtremes();
769 var xWindowLimits
= this.dygraph_
.xAxisRange();
770 var xRange
= xExtremes
[1] - xExtremes
[0];
771 var leftPercent
= Math
.max(0, (xWindowLimits
[0] - xExtremes
[0])/xRange
);
772 var rightPercent
= Math
.max(0, (xExtremes
[1] - xWindowLimits
[1])/xRange
);
773 var leftCoord
= this.canvasRect_
.x
+ this.canvasRect_
.w
*leftPercent
;
774 var rightCoord
= this.canvasRect_
.x
+ this.canvasRect_
.w
*(1 - rightPercent
);
775 var handleTop
= Math
.max(this.canvasRect_
.y
, this.canvasRect_
.y
+ (this.canvasRect_
.h
- this.leftZoomHandle_
.height
)/2);
776 var halfHandleWidth
= this.leftZoomHandle_
.width
/2;
777 this.leftZoomHandle_
.style
.left
= (leftCoord
- halfHandleWidth
) + 'px';
778 this.leftZoomHandle_
.style
.top
= handleTop
+ 'px';
779 this.rightZoomHandle_
.style
.left
= (rightCoord
- halfHandleWidth
) + 'px';
780 this.rightZoomHandle_
.style
.top
= this.leftZoomHandle_
.style
.top
;
782 this.leftZoomHandle_
.style
.visibility
= 'visible';
783 this.rightZoomHandle_
.style
.visibility
= 'visible';
788 * Draws the interactive layer in the foreground canvas.
790 rangeSelector
.prototype.drawInteractiveLayer_
= function() {
791 var ctx
= this.fgcanvas_ctx_
;
792 ctx
.clearRect(0, 0, this.canvasRect_
.w
, this.canvasRect_
.h
);
794 var width
= this.canvasRect_
.w
- margin
;
795 var height
= this.canvasRect_
.h
- margin
;
796 var zoomHandleStatus
= this.getZoomHandleStatus_();
798 ctx
.strokeStyle
= 'black';
799 if (!zoomHandleStatus
.isZoomed
) {
801 ctx
.moveTo(margin
, margin
);
802 ctx
.lineTo(margin
, height
);
803 ctx
.lineTo(width
, height
);
804 ctx
.lineTo(width
, margin
);
806 if (this.iePanOverlay_
) {
807 this.iePanOverlay_
.style
.display
= 'none';
810 var leftHandleCanvasPos
= Math
.max(margin
, zoomHandleStatus
.leftHandlePos
- this.canvasRect_
.x
);
811 var rightHandleCanvasPos
= Math
.min(width
, zoomHandleStatus
.rightHandlePos
- this.canvasRect_
.x
);
813 ctx
.fillStyle
= 'rgba(240, 240, 240, 0.6)';
814 ctx
.fillRect(0, 0, leftHandleCanvasPos
, this.canvasRect_
.h
);
815 ctx
.fillRect(rightHandleCanvasPos
, 0, this.canvasRect_
.w
- rightHandleCanvasPos
, this.canvasRect_
.h
);
818 ctx
.moveTo(margin
, margin
);
819 ctx
.lineTo(leftHandleCanvasPos
, margin
);
820 ctx
.lineTo(leftHandleCanvasPos
, height
);
821 ctx
.lineTo(rightHandleCanvasPos
, height
);
822 ctx
.lineTo(rightHandleCanvasPos
, margin
);
823 ctx
.lineTo(width
, margin
);
826 if (this.isUsingExcanvas_
) {
827 this.iePanOverlay_
.style
.width
= (rightHandleCanvasPos
- leftHandleCanvasPos
) + 'px';
828 this.iePanOverlay_
.style
.left
= leftHandleCanvasPos
+ 'px';
829 this.iePanOverlay_
.style
.height
= height
+ 'px';
830 this.iePanOverlay_
.style
.display
= 'inline';
837 * Returns the current zoom handle position information.
838 * @return {Object} The zoom handle status.
840 rangeSelector
.prototype.getZoomHandleStatus_
= function() {
841 var halfHandleWidth
= this.leftZoomHandle_
.width
/2;
842 var leftHandlePos
= parseFloat(this.leftZoomHandle_
.style
.left
) + halfHandleWidth
;
843 var rightHandlePos
= parseFloat(this.rightZoomHandle_
.style
.left
) + halfHandleWidth
;
845 leftHandlePos
: leftHandlePos
,
846 rightHandlePos
: rightHandlePos
,
847 isZoomed
: (leftHandlePos
- 1 > this.canvasRect_
.x
|| rightHandlePos
+ 1 < this.canvasRect_
.x
+this.canvasRect_
.w
)
851 return rangeSelector
;