Merge pull request #565 from danvk/gulp
[dygraphs.git] / src / plugins / range-selector.js
1 /**
2 * @license
3 * Copyright 2011 Paul Felix (paul.eric.felix@gmail.com)
4 * MIT-licensed (http://opensource.org/licenses/MIT)
5 */
6 /*global Dygraph:false,TouchEvent:false */
7
8 /**
9 * @fileoverview This file contains the RangeSelector plugin used to provide
10 * a timeline range selector widget for dygraphs.
11 */
12
13 Dygraph.Plugins.RangeSelector = (function() {
14
15 /*global Dygraph:false */
16 "use strict";
17
18 var rangeSelector = function() {
19 this.isIE_ = /MSIE/.test(navigator.userAgent) && !window.opera;
20 this.hasTouchInterface_ = typeof(TouchEvent) != 'undefined';
21 this.isMobileDevice_ = /mobile|android/gi.test(navigator.appVersion);
22 this.interfaceCreated_ = false;
23 };
24
25 rangeSelector.prototype.toString = function() {
26 return "RangeSelector Plugin";
27 };
28
29 rangeSelector.prototype.activate = function(dygraph) {
30 this.dygraph_ = dygraph;
31 if (this.getOption_('showRangeSelector')) {
32 this.createInterface_();
33 }
34 return {
35 layout: this.reserveSpace_,
36 predraw: this.renderStaticLayer_,
37 didDrawChart: this.renderInteractiveLayer_
38 };
39 };
40
41 rangeSelector.prototype.destroy = function() {
42 this.bgcanvas_ = null;
43 this.fgcanvas_ = null;
44 this.leftZoomHandle_ = null;
45 this.rightZoomHandle_ = null;
46 };
47
48 //------------------------------------------------------------------
49 // Private methods
50 //------------------------------------------------------------------
51
52 rangeSelector.prototype.getOption_ = function(name, opt_series) {
53 return this.dygraph_.getOption(name, opt_series);
54 };
55
56 rangeSelector.prototype.setDefaultOption_ = function(name, value) {
57 this.dygraph_.attrs_[name] = value;
58 };
59
60 /**
61 * @private
62 * Creates the range selector elements and adds them to the graph.
63 */
64 rangeSelector.prototype.createInterface_ = function() {
65 this.createCanvases_();
66 this.createZoomHandles_();
67 this.initInteraction_();
68
69 // Range selector and animatedZooms have a bad interaction. See issue 359.
70 if (this.getOption_('animatedZooms')) {
71 console.warn('Animated zooms and range selector are not compatible; disabling animatedZooms.');
72 this.dygraph_.updateOptions({animatedZooms: false}, true);
73 }
74
75 this.interfaceCreated_ = true;
76 this.addToGraph_();
77 };
78
79 /**
80 * @private
81 * Adds the range selector to the graph.
82 */
83 rangeSelector.prototype.addToGraph_ = function() {
84 var graphDiv = this.graphDiv_ = this.dygraph_.graphDiv;
85 graphDiv.appendChild(this.bgcanvas_);
86 graphDiv.appendChild(this.fgcanvas_);
87 graphDiv.appendChild(this.leftZoomHandle_);
88 graphDiv.appendChild(this.rightZoomHandle_);
89 };
90
91 /**
92 * @private
93 * Removes the range selector from the graph.
94 */
95 rangeSelector.prototype.removeFromGraph_ = function() {
96 var graphDiv = this.graphDiv_;
97 graphDiv.removeChild(this.bgcanvas_);
98 graphDiv.removeChild(this.fgcanvas_);
99 graphDiv.removeChild(this.leftZoomHandle_);
100 graphDiv.removeChild(this.rightZoomHandle_);
101 this.graphDiv_ = null;
102 };
103
104 /**
105 * @private
106 * Called by Layout to allow range selector to reserve its space.
107 */
108 rangeSelector.prototype.reserveSpace_ = function(e) {
109 if (this.getOption_('showRangeSelector')) {
110 e.reserveSpaceBottom(this.getOption_('rangeSelectorHeight') + 4);
111 }
112 };
113
114 /**
115 * @private
116 * Renders the static portion of the range selector at the predraw stage.
117 */
118 rangeSelector.prototype.renderStaticLayer_ = function() {
119 if (!this.updateVisibility_()) {
120 return;
121 }
122 this.resize_();
123 this.drawStaticLayer_();
124 };
125
126 /**
127 * @private
128 * Renders the interactive portion of the range selector after the chart has been drawn.
129 */
130 rangeSelector.prototype.renderInteractiveLayer_ = function() {
131 if (!this.updateVisibility_() || this.isChangingRange_) {
132 return;
133 }
134 this.placeZoomHandles_();
135 this.drawInteractiveLayer_();
136 };
137
138 /**
139 * @private
140 * Check to see if the range selector is enabled/disabled and update visibility accordingly.
141 */
142 rangeSelector.prototype.updateVisibility_ = function() {
143 var enabled = this.getOption_('showRangeSelector');
144 if (enabled) {
145 if (!this.interfaceCreated_) {
146 this.createInterface_();
147 } else if (!this.graphDiv_ || !this.graphDiv_.parentNode) {
148 this.addToGraph_();
149 }
150 } else if (this.graphDiv_) {
151 this.removeFromGraph_();
152 var dygraph = this.dygraph_;
153 setTimeout(function() { dygraph.width_ = 0; dygraph.resize(); }, 1);
154 }
155 return enabled;
156 };
157
158 /**
159 * @private
160 * Resizes the range selector.
161 */
162 rangeSelector.prototype.resize_ = function() {
163 function setElementRect(canvas, context, rect) {
164 var canvasScale = Dygraph.getContextPixelRatio(context);
165
166 canvas.style.top = rect.y + 'px';
167 canvas.style.left = rect.x + 'px';
168 canvas.width = rect.w * canvasScale;
169 canvas.height = rect.h * canvasScale;
170 canvas.style.width = rect.w + 'px';
171 canvas.style.height = rect.h + 'px';
172
173 if(canvasScale != 1) {
174 context.scale(canvasScale, canvasScale);
175 }
176 }
177
178 var plotArea = this.dygraph_.layout_.getPlotArea();
179
180 var xAxisLabelHeight = 0;
181 if (this.dygraph_.getOptionForAxis('drawAxis', 'x')) {
182 xAxisLabelHeight = this.getOption_('xAxisHeight') || (this.getOption_('axisLabelFontSize') + 2 * this.getOption_('axisTickSize'));
183 }
184 this.canvasRect_ = {
185 x: plotArea.x,
186 y: plotArea.y + plotArea.h + xAxisLabelHeight + 4,
187 w: plotArea.w,
188 h: this.getOption_('rangeSelectorHeight')
189 };
190
191 setElementRect(this.bgcanvas_, this.bgcanvas_ctx_, this.canvasRect_);
192 setElementRect(this.fgcanvas_, this.fgcanvas_ctx_, this.canvasRect_);
193 };
194
195 /**
196 * @private
197 * Creates the background and foreground canvases.
198 */
199 rangeSelector.prototype.createCanvases_ = function() {
200 this.bgcanvas_ = Dygraph.createCanvas();
201 this.bgcanvas_.className = 'dygraph-rangesel-bgcanvas';
202 this.bgcanvas_.style.position = 'absolute';
203 this.bgcanvas_.style.zIndex = 9;
204 this.bgcanvas_ctx_ = Dygraph.getContext(this.bgcanvas_);
205
206 this.fgcanvas_ = Dygraph.createCanvas();
207 this.fgcanvas_.className = 'dygraph-rangesel-fgcanvas';
208 this.fgcanvas_.style.position = 'absolute';
209 this.fgcanvas_.style.zIndex = 9;
210 this.fgcanvas_.style.cursor = 'default';
211 this.fgcanvas_ctx_ = Dygraph.getContext(this.fgcanvas_);
212 };
213
214 /**
215 * @private
216 * Creates the zoom handle elements.
217 */
218 rangeSelector.prototype.createZoomHandles_ = function() {
219 var img = new Image();
220 img.className = 'dygraph-rangesel-zoomhandle';
221 img.style.position = 'absolute';
222 img.style.zIndex = 10;
223 img.style.visibility = 'hidden'; // Initially hidden so they don't show up in the wrong place.
224 img.style.cursor = 'col-resize';
225 //TODO: change image to more options
226 if (/MSIE 7/.test(navigator.userAgent)) { // IE7 doesn't support embedded src data.
227 img.width = 7;
228 img.height = 14;
229 img.style.backgroundColor = 'white';
230 img.style.border = '1px solid #333333'; // Just show box in IE7.
231 } else {
232 img.width = 9;
233 img.height = 16;
234 img.src = 'data:image/png;base64,' +
235 'iVBORw0KGgoAAAANSUhEUgAAAAkAAAAQCAYAAADESFVDAAAAAXNSR0IArs4c6QAAAAZiS0dEANAA' +
236 'zwDP4Z7KegAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAAd0SU1FB9sHGw0cMqdt1UwAAAAZdEVYdENv' +
237 'bW1lbnQAQ3JlYXRlZCB3aXRoIEdJTVBXgQ4XAAAAaElEQVQoz+3SsRFAQBCF4Z9WJM8KCDVwownl' +
238 '6YXsTmCUsyKGkZzcl7zkz3YLkypgAnreFmDEpHkIwVOMfpdi9CEEN2nGpFdwD03yEqDtOgCaun7s' +
239 'qSTDH32I1pQA2Pb9sZecAxc5r3IAb21d6878xsAAAAAASUVORK5CYII=';
240 }
241
242 if (this.isMobileDevice_) {
243 img.width *= 2;
244 img.height *= 2;
245 }
246
247 this.leftZoomHandle_ = img;
248 this.rightZoomHandle_ = img.cloneNode(false);
249 };
250
251 /**
252 * @private
253 * Sets up the interaction for the range selector.
254 */
255 rangeSelector.prototype.initInteraction_ = function() {
256 var self = this;
257 var topElem = document;
258 var clientXLast = 0;
259 var handle = null;
260 var isZooming = false;
261 var isPanning = false;
262 var dynamic = !this.isMobileDevice_;
263
264 // We cover iframes during mouse interactions. See comments in
265 // dygraph-utils.js for more info on why this is a good idea.
266 var tarp = new Dygraph.IFrameTarp();
267
268 // functions, defined below. Defining them this way (rather than with
269 // "function foo() {...}" makes JSHint happy.
270 var toXDataWindow, onZoomStart, onZoom, onZoomEnd, doZoom, isMouseInPanZone,
271 onPanStart, onPan, onPanEnd, doPan, onCanvasHover;
272
273 // Touch event functions
274 var onZoomHandleTouchEvent, onCanvasTouchEvent, addTouchEvents;
275
276 toXDataWindow = function(zoomHandleStatus) {
277 var xDataLimits = self.dygraph_.xAxisExtremes();
278 var fact = (xDataLimits[1] - xDataLimits[0])/self.canvasRect_.w;
279 var xDataMin = xDataLimits[0] + (zoomHandleStatus.leftHandlePos - self.canvasRect_.x)*fact;
280 var xDataMax = xDataLimits[0] + (zoomHandleStatus.rightHandlePos - self.canvasRect_.x)*fact;
281 return [xDataMin, xDataMax];
282 };
283
284 onZoomStart = function(e) {
285 Dygraph.cancelEvent(e);
286 isZooming = true;
287 clientXLast = e.clientX;
288 handle = e.target ? e.target : e.srcElement;
289 if (e.type === 'mousedown' || e.type === 'dragstart') {
290 // These events are removed manually.
291 Dygraph.addEvent(topElem, 'mousemove', onZoom);
292 Dygraph.addEvent(topElem, 'mouseup', onZoomEnd);
293 }
294 self.fgcanvas_.style.cursor = 'col-resize';
295 tarp.cover();
296 return true;
297 };
298
299 onZoom = function(e) {
300 if (!isZooming) {
301 return false;
302 }
303 Dygraph.cancelEvent(e);
304
305 var delX = e.clientX - clientXLast;
306 if (Math.abs(delX) < 4) {
307 return true;
308 }
309 clientXLast = e.clientX;
310
311 // Move handle.
312 var zoomHandleStatus = self.getZoomHandleStatus_();
313 var newPos;
314 if (handle == self.leftZoomHandle_) {
315 newPos = zoomHandleStatus.leftHandlePos + delX;
316 newPos = Math.min(newPos, zoomHandleStatus.rightHandlePos - handle.width - 3);
317 newPos = Math.max(newPos, self.canvasRect_.x);
318 } else {
319 newPos = zoomHandleStatus.rightHandlePos + delX;
320 newPos = Math.min(newPos, self.canvasRect_.x + self.canvasRect_.w);
321 newPos = Math.max(newPos, zoomHandleStatus.leftHandlePos + handle.width + 3);
322 }
323 var halfHandleWidth = handle.width/2;
324 handle.style.left = (newPos - halfHandleWidth) + 'px';
325 self.drawInteractiveLayer_();
326
327 // Zoom on the fly.
328 if (dynamic) {
329 doZoom();
330 }
331 return true;
332 };
333
334 onZoomEnd = function(e) {
335 if (!isZooming) {
336 return false;
337 }
338 isZooming = false;
339 tarp.uncover();
340 Dygraph.removeEvent(topElem, 'mousemove', onZoom);
341 Dygraph.removeEvent(topElem, 'mouseup', onZoomEnd);
342 self.fgcanvas_.style.cursor = 'default';
343
344 // If on a slower device, zoom now.
345 if (!dynamic) {
346 doZoom();
347 }
348 return true;
349 };
350
351 doZoom = function() {
352 try {
353 var zoomHandleStatus = self.getZoomHandleStatus_();
354 self.isChangingRange_ = true;
355 if (!zoomHandleStatus.isZoomed) {
356 self.dygraph_.resetZoom();
357 } else {
358 var xDataWindow = toXDataWindow(zoomHandleStatus);
359 self.dygraph_.doZoomXDates_(xDataWindow[0], xDataWindow[1]);
360 }
361 } finally {
362 self.isChangingRange_ = false;
363 }
364 };
365
366 isMouseInPanZone = function(e) {
367 var rect = self.leftZoomHandle_.getBoundingClientRect();
368 var leftHandleClientX = rect.left + rect.width/2;
369 rect = self.rightZoomHandle_.getBoundingClientRect();
370 var rightHandleClientX = rect.left + rect.width/2;
371 return (e.clientX > leftHandleClientX && e.clientX < rightHandleClientX);
372 };
373
374 onPanStart = function(e) {
375 if (!isPanning && isMouseInPanZone(e) && self.getZoomHandleStatus_().isZoomed) {
376 Dygraph.cancelEvent(e);
377 isPanning = true;
378 clientXLast = e.clientX;
379 if (e.type === 'mousedown') {
380 // These events are removed manually.
381 Dygraph.addEvent(topElem, 'mousemove', onPan);
382 Dygraph.addEvent(topElem, 'mouseup', onPanEnd);
383 }
384 return true;
385 }
386 return false;
387 };
388
389 onPan = function(e) {
390 if (!isPanning) {
391 return false;
392 }
393 Dygraph.cancelEvent(e);
394
395 var delX = e.clientX - clientXLast;
396 if (Math.abs(delX) < 4) {
397 return true;
398 }
399 clientXLast = e.clientX;
400
401 // Move range view
402 var zoomHandleStatus = self.getZoomHandleStatus_();
403 var leftHandlePos = zoomHandleStatus.leftHandlePos;
404 var rightHandlePos = zoomHandleStatus.rightHandlePos;
405 var rangeSize = rightHandlePos - leftHandlePos;
406 if (leftHandlePos + delX <= self.canvasRect_.x) {
407 leftHandlePos = self.canvasRect_.x;
408 rightHandlePos = leftHandlePos + rangeSize;
409 } else if (rightHandlePos + delX >= self.canvasRect_.x + self.canvasRect_.w) {
410 rightHandlePos = self.canvasRect_.x + self.canvasRect_.w;
411 leftHandlePos = rightHandlePos - rangeSize;
412 } else {
413 leftHandlePos += delX;
414 rightHandlePos += delX;
415 }
416 var halfHandleWidth = self.leftZoomHandle_.width/2;
417 self.leftZoomHandle_.style.left = (leftHandlePos - halfHandleWidth) + 'px';
418 self.rightZoomHandle_.style.left = (rightHandlePos - halfHandleWidth) + 'px';
419 self.drawInteractiveLayer_();
420
421 // Do pan on the fly.
422 if (dynamic) {
423 doPan();
424 }
425 return true;
426 };
427
428 onPanEnd = function(e) {
429 if (!isPanning) {
430 return false;
431 }
432 isPanning = false;
433 Dygraph.removeEvent(topElem, 'mousemove', onPan);
434 Dygraph.removeEvent(topElem, 'mouseup', onPanEnd);
435 // If on a slower device, do pan now.
436 if (!dynamic) {
437 doPan();
438 }
439 return true;
440 };
441
442 doPan = function() {
443 try {
444 self.isChangingRange_ = true;
445 self.dygraph_.dateWindow_ = toXDataWindow(self.getZoomHandleStatus_());
446 self.dygraph_.drawGraph_(false);
447 } finally {
448 self.isChangingRange_ = false;
449 }
450 };
451
452 onCanvasHover = function(e) {
453 if (isZooming || isPanning) {
454 return;
455 }
456 var cursor = isMouseInPanZone(e) ? 'move' : 'default';
457 if (cursor != self.fgcanvas_.style.cursor) {
458 self.fgcanvas_.style.cursor = cursor;
459 }
460 };
461
462 onZoomHandleTouchEvent = function(e) {
463 if (e.type == 'touchstart' && e.targetTouches.length == 1) {
464 if (onZoomStart(e.targetTouches[0])) {
465 Dygraph.cancelEvent(e);
466 }
467 } else if (e.type == 'touchmove' && e.targetTouches.length == 1) {
468 if (onZoom(e.targetTouches[0])) {
469 Dygraph.cancelEvent(e);
470 }
471 } else {
472 onZoomEnd(e);
473 }
474 };
475
476 onCanvasTouchEvent = function(e) {
477 if (e.type == 'touchstart' && e.targetTouches.length == 1) {
478 if (onPanStart(e.targetTouches[0])) {
479 Dygraph.cancelEvent(e);
480 }
481 } else if (e.type == 'touchmove' && e.targetTouches.length == 1) {
482 if (onPan(e.targetTouches[0])) {
483 Dygraph.cancelEvent(e);
484 }
485 } else {
486 onPanEnd(e);
487 }
488 };
489
490 addTouchEvents = function(elem, fn) {
491 var types = ['touchstart', 'touchend', 'touchmove', 'touchcancel'];
492 for (var i = 0; i < types.length; i++) {
493 self.dygraph_.addAndTrackEvent(elem, types[i], fn);
494 }
495 };
496
497 this.setDefaultOption_('interactionModel', Dygraph.Interaction.dragIsPanInteractionModel);
498 this.setDefaultOption_('panEdgeFraction', 0.0001);
499
500 var dragStartEvent = window.opera ? 'mousedown' : 'dragstart';
501 this.dygraph_.addAndTrackEvent(this.leftZoomHandle_, dragStartEvent, onZoomStart);
502 this.dygraph_.addAndTrackEvent(this.rightZoomHandle_, dragStartEvent, onZoomStart);
503
504 this.dygraph_.addAndTrackEvent(this.fgcanvas_, 'mousedown', onPanStart);
505 this.dygraph_.addAndTrackEvent(this.fgcanvas_, 'mousemove', onCanvasHover);
506
507 // Touch events
508 if (this.hasTouchInterface_) {
509 addTouchEvents(this.leftZoomHandle_, onZoomHandleTouchEvent);
510 addTouchEvents(this.rightZoomHandle_, onZoomHandleTouchEvent);
511 addTouchEvents(this.fgcanvas_, onCanvasTouchEvent);
512 }
513 };
514
515 /**
516 * @private
517 * Draws the static layer in the background canvas.
518 */
519 rangeSelector.prototype.drawStaticLayer_ = function() {
520 var ctx = this.bgcanvas_ctx_;
521 ctx.clearRect(0, 0, this.canvasRect_.w, this.canvasRect_.h);
522 try {
523 this.drawMiniPlot_();
524 } catch(ex) {
525 console.warn(ex);
526 }
527
528 var margin = 0.5;
529 this.bgcanvas_ctx_.lineWidth = this.getOption_('rangeSelectorBackgroundLineWidth');
530 ctx.strokeStyle = this.getOption_('rangeSelectorBackgroundStrokeColor');
531 ctx.beginPath();
532 ctx.moveTo(margin, margin);
533 ctx.lineTo(margin, this.canvasRect_.h-margin);
534 ctx.lineTo(this.canvasRect_.w-margin, this.canvasRect_.h-margin);
535 ctx.lineTo(this.canvasRect_.w-margin, margin);
536 ctx.stroke();
537 };
538
539
540 /**
541 * @private
542 * Draws the mini plot in the background canvas.
543 */
544 rangeSelector.prototype.drawMiniPlot_ = function() {
545 var fillStyle = this.getOption_('rangeSelectorPlotFillColor');
546 var fillGradientStyle = this.getOption_('rangeSelectorPlotFillGradientColor');
547 var strokeStyle = this.getOption_('rangeSelectorPlotStrokeColor');
548 if (!fillStyle && !strokeStyle) {
549 return;
550 }
551
552 var stepPlot = this.getOption_('stepPlot');
553
554 var combinedSeriesData = this.computeCombinedSeriesAndLimits_();
555 var yRange = combinedSeriesData.yMax - combinedSeriesData.yMin;
556
557 // Draw the mini plot.
558 var ctx = this.bgcanvas_ctx_;
559 var margin = 0.5;
560
561 var xExtremes = this.dygraph_.xAxisExtremes();
562 var xRange = Math.max(xExtremes[1] - xExtremes[0], 1.e-30);
563 var xFact = (this.canvasRect_.w - margin)/xRange;
564 var yFact = (this.canvasRect_.h - margin)/yRange;
565 var canvasWidth = this.canvasRect_.w - margin;
566 var canvasHeight = this.canvasRect_.h - margin;
567
568 var prevX = null, prevY = null;
569
570 ctx.beginPath();
571 ctx.moveTo(margin, canvasHeight);
572 for (var i = 0; i < combinedSeriesData.data.length; i++) {
573 var dataPoint = combinedSeriesData.data[i];
574 var x = ((dataPoint[0] !== null) ? ((dataPoint[0] - xExtremes[0])*xFact) : NaN);
575 var y = ((dataPoint[1] !== null) ? (canvasHeight - (dataPoint[1] - combinedSeriesData.yMin)*yFact) : NaN);
576
577 // Skip points that don't change the x-value. Overly fine-grained points
578 // can cause major slowdowns with the ctx.fill() call below.
579 if (!stepPlot && prevX !== null && Math.round(x) == Math.round(prevX)) {
580 continue;
581 }
582
583 if (isFinite(x) && isFinite(y)) {
584 if(prevX === null) {
585 ctx.lineTo(x, canvasHeight);
586 }
587 else if (stepPlot) {
588 ctx.lineTo(x, prevY);
589 }
590 ctx.lineTo(x, y);
591 prevX = x;
592 prevY = y;
593 }
594 else {
595 if(prevX !== null) {
596 if (stepPlot) {
597 ctx.lineTo(x, prevY);
598 ctx.lineTo(x, canvasHeight);
599 }
600 else {
601 ctx.lineTo(prevX, canvasHeight);
602 }
603 }
604 prevX = prevY = null;
605 }
606 }
607 ctx.lineTo(canvasWidth, canvasHeight);
608 ctx.closePath();
609
610 if (fillStyle) {
611 var lingrad = this.bgcanvas_ctx_.createLinearGradient(0, 0, 0, canvasHeight);
612 if (fillGradientStyle) {
613 lingrad.addColorStop(0, fillGradientStyle);
614 }
615 lingrad.addColorStop(1, fillStyle);
616 this.bgcanvas_ctx_.fillStyle = lingrad;
617 ctx.fill();
618 }
619
620 if (strokeStyle) {
621 this.bgcanvas_ctx_.strokeStyle = strokeStyle;
622 this.bgcanvas_ctx_.lineWidth = this.getOption_('rangeSelectorPlotLineWidth');
623 ctx.stroke();
624 }
625 };
626
627 /**
628 * @private
629 * Computes and returns the combined series data along with min/max for the mini plot.
630 * The combined series consists of averaged values for all series.
631 * When series have error bars, the error bars are ignored.
632 * @return {Object} An object containing combined series array, ymin, ymax.
633 */
634 rangeSelector.prototype.computeCombinedSeriesAndLimits_ = function() {
635 var g = this.dygraph_;
636 var logscale = this.getOption_('logscale');
637 var i;
638
639 // Select series to combine. By default, all series are combined.
640 var numColumns = g.numColumns();
641 var labels = g.getLabels();
642 var includeSeries = new Array(numColumns);
643 var anySet = false;
644 for (i = 1; i < numColumns; i++) {
645 var include = this.getOption_('showInRangeSelector', labels[i]);
646 includeSeries[i] = include;
647 if (include !== null) anySet = true; // it's set explicitly for this series
648 }
649 if (!anySet) {
650 for (i = 0; i < includeSeries.length; i++) includeSeries[i] = true;
651 }
652
653 // Create a combined series (average of selected series values).
654 // TODO(danvk): short-circuit if there's only one series.
655 var rolledSeries = [];
656 var dataHandler = g.dataHandler_;
657 var options = g.attributes_;
658 for (i = 1; i < g.numColumns(); i++) {
659 if (!includeSeries[i]) continue;
660 var series = dataHandler.extractSeries(g.rawData_, i, options);
661 if (g.rollPeriod() > 1) {
662 series = dataHandler.rollingAverage(series, g.rollPeriod(), options);
663 }
664
665 rolledSeries.push(series);
666 }
667
668 var combinedSeries = [];
669 for (i = 0; i < rolledSeries[0].length; i++) {
670 var sum = 0;
671 var count = 0;
672 for (var j = 0; j < rolledSeries.length; j++) {
673 var y = rolledSeries[j][i][1];
674 if (y === null || isNaN(y)) continue;
675 count++;
676 sum += y;
677 }
678 combinedSeries.push([rolledSeries[0][i][0], sum / count]);
679 }
680
681 // Compute the y range.
682 var yMin = Number.MAX_VALUE;
683 var yMax = -Number.MAX_VALUE;
684 for (i = 0; i < combinedSeries.length; i++) {
685 var yVal = combinedSeries[i][1];
686 if (yVal !== null && isFinite(yVal) && (!logscale || yVal > 0)) {
687 yMin = Math.min(yMin, yVal);
688 yMax = Math.max(yMax, yVal);
689 }
690 }
691
692 // Convert Y data to log scale if needed.
693 // Also, expand the Y range to compress the mini plot a little.
694 var extraPercent = 0.25;
695 if (logscale) {
696 yMax = Dygraph.log10(yMax);
697 yMax += yMax*extraPercent;
698 yMin = Dygraph.log10(yMin);
699 for (i = 0; i < combinedSeries.length; i++) {
700 combinedSeries[i][1] = Dygraph.log10(combinedSeries[i][1]);
701 }
702 } else {
703 var yExtra;
704 var yRange = yMax - yMin;
705 if (yRange <= Number.MIN_VALUE) {
706 yExtra = yMax*extraPercent;
707 } else {
708 yExtra = yRange*extraPercent;
709 }
710 yMax += yExtra;
711 yMin -= yExtra;
712 }
713
714 return {data: combinedSeries, yMin: yMin, yMax: yMax};
715 };
716
717 /**
718 * @private
719 * Places the zoom handles in the proper position based on the current X data window.
720 */
721 rangeSelector.prototype.placeZoomHandles_ = function() {
722 var xExtremes = this.dygraph_.xAxisExtremes();
723 var xWindowLimits = this.dygraph_.xAxisRange();
724 var xRange = xExtremes[1] - xExtremes[0];
725 var leftPercent = Math.max(0, (xWindowLimits[0] - xExtremes[0])/xRange);
726 var rightPercent = Math.max(0, (xExtremes[1] - xWindowLimits[1])/xRange);
727 var leftCoord = this.canvasRect_.x + this.canvasRect_.w*leftPercent;
728 var rightCoord = this.canvasRect_.x + this.canvasRect_.w*(1 - rightPercent);
729 var handleTop = Math.max(this.canvasRect_.y, this.canvasRect_.y + (this.canvasRect_.h - this.leftZoomHandle_.height)/2);
730 var halfHandleWidth = this.leftZoomHandle_.width/2;
731 this.leftZoomHandle_.style.left = (leftCoord - halfHandleWidth) + 'px';
732 this.leftZoomHandle_.style.top = handleTop + 'px';
733 this.rightZoomHandle_.style.left = (rightCoord - halfHandleWidth) + 'px';
734 this.rightZoomHandle_.style.top = this.leftZoomHandle_.style.top;
735
736 this.leftZoomHandle_.style.visibility = 'visible';
737 this.rightZoomHandle_.style.visibility = 'visible';
738 };
739
740 /**
741 * @private
742 * Draws the interactive layer in the foreground canvas.
743 */
744 rangeSelector.prototype.drawInteractiveLayer_ = function() {
745 var ctx = this.fgcanvas_ctx_;
746 ctx.clearRect(0, 0, this.canvasRect_.w, this.canvasRect_.h);
747 var margin = 1;
748 var width = this.canvasRect_.w - margin;
749 var height = this.canvasRect_.h - margin;
750 var zoomHandleStatus = this.getZoomHandleStatus_();
751
752 ctx.strokeStyle = this.getOption_('rangeSelectorForegroundStrokeColor');
753 ctx.lineWidth = this.getOption_('rangeSelectorForegroundLineWidth');
754 if (!zoomHandleStatus.isZoomed) {
755 ctx.beginPath();
756 ctx.moveTo(margin, margin);
757 ctx.lineTo(margin, height);
758 ctx.lineTo(width, height);
759 ctx.lineTo(width, margin);
760 ctx.stroke();
761 } else {
762 var leftHandleCanvasPos = Math.max(margin, zoomHandleStatus.leftHandlePos - this.canvasRect_.x);
763 var rightHandleCanvasPos = Math.min(width, zoomHandleStatus.rightHandlePos - this.canvasRect_.x);
764
765 ctx.fillStyle = 'rgba(240, 240, 240, ' + this.getOption_('rangeSelectorAlpha').toString() + ')';
766 ctx.fillRect(0, 0, leftHandleCanvasPos, this.canvasRect_.h);
767 ctx.fillRect(rightHandleCanvasPos, 0, this.canvasRect_.w - rightHandleCanvasPos, this.canvasRect_.h);
768
769 ctx.beginPath();
770 ctx.moveTo(margin, margin);
771 ctx.lineTo(leftHandleCanvasPos, margin);
772 ctx.lineTo(leftHandleCanvasPos, height);
773 ctx.lineTo(rightHandleCanvasPos, height);
774 ctx.lineTo(rightHandleCanvasPos, margin);
775 ctx.lineTo(width, margin);
776 ctx.stroke();
777 }
778 };
779
780 /**
781 * @private
782 * Returns the current zoom handle position information.
783 * @return {Object} The zoom handle status.
784 */
785 rangeSelector.prototype.getZoomHandleStatus_ = function() {
786 var halfHandleWidth = this.leftZoomHandle_.width/2;
787 var leftHandlePos = parseFloat(this.leftZoomHandle_.style.left) + halfHandleWidth;
788 var rightHandlePos = parseFloat(this.rightZoomHandle_.style.left) + halfHandleWidth;
789 return {
790 leftHandlePos: leftHandlePos,
791 rightHandlePos: rightHandlePos,
792 isZoomed: (leftHandlePos - 1 > this.canvasRect_.x || rightHandlePos + 1 < this.canvasRect_.x+this.canvasRect_.w)
793 };
794 };
795
796 return rangeSelector;
797
798 })();