Merge pull request #674 from danvk/module
[dygraphs.git] / src / plugins / range-selector.js
... / ...
CommitLineData
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/*global Dygraph:false */
14"use strict";
15
16import * as utils from '../dygraph-utils';
17import DygraphInteraction from '../dygraph-interaction-model';
18
19var rangeSelector = function() {
20 this.hasTouchInterface_ = typeof(TouchEvent) != 'undefined';
21 this.isMobileDevice_ = /mobile|android/gi.test(navigator.appVersion);
22 this.interfaceCreated_ = false;
23};
24
25rangeSelector.prototype.toString = function() {
26 return "RangeSelector Plugin";
27};
28
29rangeSelector.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
41rangeSelector.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
52rangeSelector.prototype.getOption_ = function(name, opt_series) {
53 return this.dygraph_.getOption(name, opt_series);
54};
55
56rangeSelector.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 */
64rangeSelector.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 */
83rangeSelector.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 */
95rangeSelector.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 */
108rangeSelector.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 */
118rangeSelector.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 */
130rangeSelector.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 */
142rangeSelector.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 */
162rangeSelector.prototype.resize_ = function() {
163 function setElementRect(canvas, context, rect) {
164 var canvasScale = utils.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 */
199rangeSelector.prototype.createCanvases_ = function() {
200 this.bgcanvas_ = utils.createCanvas();
201 this.bgcanvas_.className = 'dygraph-rangesel-bgcanvas';
202 this.bgcanvas_.style.position = 'absolute';
203 this.bgcanvas_.style.zIndex = 9;
204 this.bgcanvas_ctx_ = utils.getContext(this.bgcanvas_);
205
206 this.fgcanvas_ = utils.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_ = utils.getContext(this.fgcanvas_);
212};
213
214/**
215 * @private
216 * Creates the zoom handle elements.
217 */
218rangeSelector.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 img.width = 9;
227 img.height = 16;
228 img.src = 'data:image/png;base64,' +
229'iVBORw0KGgoAAAANSUhEUgAAAAkAAAAQCAYAAADESFVDAAAAAXNSR0IArs4c6QAAAAZiS0dEANAA' +
230'zwDP4Z7KegAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAAd0SU1FB9sHGw0cMqdt1UwAAAAZdEVYdENv' +
231'bW1lbnQAQ3JlYXRlZCB3aXRoIEdJTVBXgQ4XAAAAaElEQVQoz+3SsRFAQBCF4Z9WJM8KCDVwownl' +
232'6YXsTmCUsyKGkZzcl7zkz3YLkypgAnreFmDEpHkIwVOMfpdi9CEEN2nGpFdwD03yEqDtOgCaun7s' +
233'qSTDH32I1pQA2Pb9sZecAxc5r3IAb21d6878xsAAAAAASUVORK5CYII=';
234
235 if (this.isMobileDevice_) {
236 img.width *= 2;
237 img.height *= 2;
238 }
239
240 this.leftZoomHandle_ = img;
241 this.rightZoomHandle_ = img.cloneNode(false);
242};
243
244/**
245 * @private
246 * Sets up the interaction for the range selector.
247 */
248rangeSelector.prototype.initInteraction_ = function() {
249 var self = this;
250 var topElem = document;
251 var clientXLast = 0;
252 var handle = null;
253 var isZooming = false;
254 var isPanning = false;
255 var dynamic = !this.isMobileDevice_;
256
257 // We cover iframes during mouse interactions. See comments in
258 // dygraph-utils.js for more info on why this is a good idea.
259 var tarp = new utils.IFrameTarp();
260
261 // functions, defined below. Defining them this way (rather than with
262 // "function foo() {...}" makes JSHint happy.
263 var toXDataWindow, onZoomStart, onZoom, onZoomEnd, doZoom, isMouseInPanZone,
264 onPanStart, onPan, onPanEnd, doPan, onCanvasHover;
265
266 // Touch event functions
267 var onZoomHandleTouchEvent, onCanvasTouchEvent, addTouchEvents;
268
269 toXDataWindow = function(zoomHandleStatus) {
270 var xDataLimits = self.dygraph_.xAxisExtremes();
271 var fact = (xDataLimits[1] - xDataLimits[0])/self.canvasRect_.w;
272 var xDataMin = xDataLimits[0] + (zoomHandleStatus.leftHandlePos - self.canvasRect_.x)*fact;
273 var xDataMax = xDataLimits[0] + (zoomHandleStatus.rightHandlePos - self.canvasRect_.x)*fact;
274 return [xDataMin, xDataMax];
275 };
276
277 onZoomStart = function(e) {
278 utils.cancelEvent(e);
279 isZooming = true;
280 clientXLast = e.clientX;
281 handle = e.target ? e.target : e.srcElement;
282 if (e.type === 'mousedown' || e.type === 'dragstart') {
283 // These events are removed manually.
284 utils.addEvent(topElem, 'mousemove', onZoom);
285 utils.addEvent(topElem, 'mouseup', onZoomEnd);
286 }
287 self.fgcanvas_.style.cursor = 'col-resize';
288 tarp.cover();
289 return true;
290 };
291
292 onZoom = function(e) {
293 if (!isZooming) {
294 return false;
295 }
296 utils.cancelEvent(e);
297
298 var delX = e.clientX - clientXLast;
299 if (Math.abs(delX) < 4) {
300 return true;
301 }
302 clientXLast = e.clientX;
303
304 // Move handle.
305 var zoomHandleStatus = self.getZoomHandleStatus_();
306 var newPos;
307 if (handle == self.leftZoomHandle_) {
308 newPos = zoomHandleStatus.leftHandlePos + delX;
309 newPos = Math.min(newPos, zoomHandleStatus.rightHandlePos - handle.width - 3);
310 newPos = Math.max(newPos, self.canvasRect_.x);
311 } else {
312 newPos = zoomHandleStatus.rightHandlePos + delX;
313 newPos = Math.min(newPos, self.canvasRect_.x + self.canvasRect_.w);
314 newPos = Math.max(newPos, zoomHandleStatus.leftHandlePos + handle.width + 3);
315 }
316 var halfHandleWidth = handle.width/2;
317 handle.style.left = (newPos - halfHandleWidth) + 'px';
318 self.drawInteractiveLayer_();
319
320 // Zoom on the fly.
321 if (dynamic) {
322 doZoom();
323 }
324 return true;
325 };
326
327 onZoomEnd = function(e) {
328 if (!isZooming) {
329 return false;
330 }
331 isZooming = false;
332 tarp.uncover();
333 utils.removeEvent(topElem, 'mousemove', onZoom);
334 utils.removeEvent(topElem, 'mouseup', onZoomEnd);
335 self.fgcanvas_.style.cursor = 'default';
336
337 // If on a slower device, zoom now.
338 if (!dynamic) {
339 doZoom();
340 }
341 return true;
342 };
343
344 doZoom = function() {
345 try {
346 var zoomHandleStatus = self.getZoomHandleStatus_();
347 self.isChangingRange_ = true;
348 if (!zoomHandleStatus.isZoomed) {
349 self.dygraph_.resetZoom();
350 } else {
351 var xDataWindow = toXDataWindow(zoomHandleStatus);
352 self.dygraph_.doZoomXDates_(xDataWindow[0], xDataWindow[1]);
353 }
354 } finally {
355 self.isChangingRange_ = false;
356 }
357 };
358
359 isMouseInPanZone = function(e) {
360 var rect = self.leftZoomHandle_.getBoundingClientRect();
361 var leftHandleClientX = rect.left + rect.width/2;
362 rect = self.rightZoomHandle_.getBoundingClientRect();
363 var rightHandleClientX = rect.left + rect.width/2;
364 return (e.clientX > leftHandleClientX && e.clientX < rightHandleClientX);
365 };
366
367 onPanStart = function(e) {
368 if (!isPanning && isMouseInPanZone(e) && self.getZoomHandleStatus_().isZoomed) {
369 utils.cancelEvent(e);
370 isPanning = true;
371 clientXLast = e.clientX;
372 if (e.type === 'mousedown') {
373 // These events are removed manually.
374 utils.addEvent(topElem, 'mousemove', onPan);
375 utils.addEvent(topElem, 'mouseup', onPanEnd);
376 }
377 return true;
378 }
379 return false;
380 };
381
382 onPan = function(e) {
383 if (!isPanning) {
384 return false;
385 }
386 utils.cancelEvent(e);
387
388 var delX = e.clientX - clientXLast;
389 if (Math.abs(delX) < 4) {
390 return true;
391 }
392 clientXLast = e.clientX;
393
394 // Move range view
395 var zoomHandleStatus = self.getZoomHandleStatus_();
396 var leftHandlePos = zoomHandleStatus.leftHandlePos;
397 var rightHandlePos = zoomHandleStatus.rightHandlePos;
398 var rangeSize = rightHandlePos - leftHandlePos;
399 if (leftHandlePos + delX <= self.canvasRect_.x) {
400 leftHandlePos = self.canvasRect_.x;
401 rightHandlePos = leftHandlePos + rangeSize;
402 } else if (rightHandlePos + delX >= self.canvasRect_.x + self.canvasRect_.w) {
403 rightHandlePos = self.canvasRect_.x + self.canvasRect_.w;
404 leftHandlePos = rightHandlePos - rangeSize;
405 } else {
406 leftHandlePos += delX;
407 rightHandlePos += delX;
408 }
409 var halfHandleWidth = self.leftZoomHandle_.width/2;
410 self.leftZoomHandle_.style.left = (leftHandlePos - halfHandleWidth) + 'px';
411 self.rightZoomHandle_.style.left = (rightHandlePos - halfHandleWidth) + 'px';
412 self.drawInteractiveLayer_();
413
414 // Do pan on the fly.
415 if (dynamic) {
416 doPan();
417 }
418 return true;
419 };
420
421 onPanEnd = function(e) {
422 if (!isPanning) {
423 return false;
424 }
425 isPanning = false;
426 utils.removeEvent(topElem, 'mousemove', onPan);
427 utils.removeEvent(topElem, 'mouseup', onPanEnd);
428 // If on a slower device, do pan now.
429 if (!dynamic) {
430 doPan();
431 }
432 return true;
433 };
434
435 doPan = function() {
436 try {
437 self.isChangingRange_ = true;
438 self.dygraph_.dateWindow_ = toXDataWindow(self.getZoomHandleStatus_());
439 self.dygraph_.drawGraph_(false);
440 } finally {
441 self.isChangingRange_ = false;
442 }
443 };
444
445 onCanvasHover = function(e) {
446 if (isZooming || isPanning) {
447 return;
448 }
449 var cursor = isMouseInPanZone(e) ? 'move' : 'default';
450 if (cursor != self.fgcanvas_.style.cursor) {
451 self.fgcanvas_.style.cursor = cursor;
452 }
453 };
454
455 onZoomHandleTouchEvent = function(e) {
456 if (e.type == 'touchstart' && e.targetTouches.length == 1) {
457 if (onZoomStart(e.targetTouches[0])) {
458 utils.cancelEvent(e);
459 }
460 } else if (e.type == 'touchmove' && e.targetTouches.length == 1) {
461 if (onZoom(e.targetTouches[0])) {
462 utils.cancelEvent(e);
463 }
464 } else {
465 onZoomEnd(e);
466 }
467 };
468
469 onCanvasTouchEvent = function(e) {
470 if (e.type == 'touchstart' && e.targetTouches.length == 1) {
471 if (onPanStart(e.targetTouches[0])) {
472 utils.cancelEvent(e);
473 }
474 } else if (e.type == 'touchmove' && e.targetTouches.length == 1) {
475 if (onPan(e.targetTouches[0])) {
476 utils.cancelEvent(e);
477 }
478 } else {
479 onPanEnd(e);
480 }
481 };
482
483 addTouchEvents = function(elem, fn) {
484 var types = ['touchstart', 'touchend', 'touchmove', 'touchcancel'];
485 for (var i = 0; i < types.length; i++) {
486 self.dygraph_.addAndTrackEvent(elem, types[i], fn);
487 }
488 };
489
490 this.setDefaultOption_('interactionModel', DygraphInteraction.dragIsPanInteractionModel);
491 this.setDefaultOption_('panEdgeFraction', 0.0001);
492
493 var dragStartEvent = window.opera ? 'mousedown' : 'dragstart';
494 this.dygraph_.addAndTrackEvent(this.leftZoomHandle_, dragStartEvent, onZoomStart);
495 this.dygraph_.addAndTrackEvent(this.rightZoomHandle_, dragStartEvent, onZoomStart);
496
497 this.dygraph_.addAndTrackEvent(this.fgcanvas_, 'mousedown', onPanStart);
498 this.dygraph_.addAndTrackEvent(this.fgcanvas_, 'mousemove', onCanvasHover);
499
500 // Touch events
501 if (this.hasTouchInterface_) {
502 addTouchEvents(this.leftZoomHandle_, onZoomHandleTouchEvent);
503 addTouchEvents(this.rightZoomHandle_, onZoomHandleTouchEvent);
504 addTouchEvents(this.fgcanvas_, onCanvasTouchEvent);
505 }
506};
507
508/**
509 * @private
510 * Draws the static layer in the background canvas.
511 */
512rangeSelector.prototype.drawStaticLayer_ = function() {
513 var ctx = this.bgcanvas_ctx_;
514 ctx.clearRect(0, 0, this.canvasRect_.w, this.canvasRect_.h);
515 try {
516 this.drawMiniPlot_();
517 } catch(ex) {
518 console.warn(ex);
519 }
520
521 var margin = 0.5;
522 this.bgcanvas_ctx_.lineWidth = this.getOption_('rangeSelectorBackgroundLineWidth');
523 ctx.strokeStyle = this.getOption_('rangeSelectorBackgroundStrokeColor');
524 ctx.beginPath();
525 ctx.moveTo(margin, margin);
526 ctx.lineTo(margin, this.canvasRect_.h-margin);
527 ctx.lineTo(this.canvasRect_.w-margin, this.canvasRect_.h-margin);
528 ctx.lineTo(this.canvasRect_.w-margin, margin);
529 ctx.stroke();
530};
531
532
533/**
534 * @private
535 * Draws the mini plot in the background canvas.
536 */
537rangeSelector.prototype.drawMiniPlot_ = function() {
538 var fillStyle = this.getOption_('rangeSelectorPlotFillColor');
539 var fillGradientStyle = this.getOption_('rangeSelectorPlotFillGradientColor');
540 var strokeStyle = this.getOption_('rangeSelectorPlotStrokeColor');
541 if (!fillStyle && !strokeStyle) {
542 return;
543 }
544
545 var stepPlot = this.getOption_('stepPlot');
546
547 var combinedSeriesData = this.computeCombinedSeriesAndLimits_();
548 var yRange = combinedSeriesData.yMax - combinedSeriesData.yMin;
549
550 // Draw the mini plot.
551 var ctx = this.bgcanvas_ctx_;
552 var margin = 0.5;
553
554 var xExtremes = this.dygraph_.xAxisExtremes();
555 var xRange = Math.max(xExtremes[1] - xExtremes[0], 1.e-30);
556 var xFact = (this.canvasRect_.w - margin)/xRange;
557 var yFact = (this.canvasRect_.h - margin)/yRange;
558 var canvasWidth = this.canvasRect_.w - margin;
559 var canvasHeight = this.canvasRect_.h - margin;
560
561 var prevX = null, prevY = null;
562
563 ctx.beginPath();
564 ctx.moveTo(margin, canvasHeight);
565 for (var i = 0; i < combinedSeriesData.data.length; i++) {
566 var dataPoint = combinedSeriesData.data[i];
567 var x = ((dataPoint[0] !== null) ? ((dataPoint[0] - xExtremes[0])*xFact) : NaN);
568 var y = ((dataPoint[1] !== null) ? (canvasHeight - (dataPoint[1] - combinedSeriesData.yMin)*yFact) : NaN);
569
570 // Skip points that don't change the x-value. Overly fine-grained points
571 // can cause major slowdowns with the ctx.fill() call below.
572 if (!stepPlot && prevX !== null && Math.round(x) == Math.round(prevX)) {
573 continue;
574 }
575
576 if (isFinite(x) && isFinite(y)) {
577 if(prevX === null) {
578 ctx.lineTo(x, canvasHeight);
579 }
580 else if (stepPlot) {
581 ctx.lineTo(x, prevY);
582 }
583 ctx.lineTo(x, y);
584 prevX = x;
585 prevY = y;
586 }
587 else {
588 if(prevX !== null) {
589 if (stepPlot) {
590 ctx.lineTo(x, prevY);
591 ctx.lineTo(x, canvasHeight);
592 }
593 else {
594 ctx.lineTo(prevX, canvasHeight);
595 }
596 }
597 prevX = prevY = null;
598 }
599 }
600 ctx.lineTo(canvasWidth, canvasHeight);
601 ctx.closePath();
602
603 if (fillStyle) {
604 var lingrad = this.bgcanvas_ctx_.createLinearGradient(0, 0, 0, canvasHeight);
605 if (fillGradientStyle) {
606 lingrad.addColorStop(0, fillGradientStyle);
607 }
608 lingrad.addColorStop(1, fillStyle);
609 this.bgcanvas_ctx_.fillStyle = lingrad;
610 ctx.fill();
611 }
612
613 if (strokeStyle) {
614 this.bgcanvas_ctx_.strokeStyle = strokeStyle;
615 this.bgcanvas_ctx_.lineWidth = this.getOption_('rangeSelectorPlotLineWidth');
616 ctx.stroke();
617 }
618};
619
620/**
621 * @private
622 * Computes and returns the combined series data along with min/max for the mini plot.
623 * The combined series consists of averaged values for all series.
624 * When series have error bars, the error bars are ignored.
625 * @return {Object} An object containing combined series array, ymin, ymax.
626 */
627rangeSelector.prototype.computeCombinedSeriesAndLimits_ = function() {
628 var g = this.dygraph_;
629 var logscale = this.getOption_('logscale');
630 var i;
631
632 // Select series to combine. By default, all series are combined.
633 var numColumns = g.numColumns();
634 var labels = g.getLabels();
635 var includeSeries = new Array(numColumns);
636 var anySet = false;
637 for (i = 1; i < numColumns; i++) {
638 var include = this.getOption_('showInRangeSelector', labels[i]);
639 includeSeries[i] = include;
640 if (include !== null) anySet = true; // it's set explicitly for this series
641 }
642 if (!anySet) {
643 for (i = 0; i < includeSeries.length; i++) includeSeries[i] = true;
644 }
645
646 // Create a combined series (average of selected series values).
647 // TODO(danvk): short-circuit if there's only one series.
648 var rolledSeries = [];
649 var dataHandler = g.dataHandler_;
650 var options = g.attributes_;
651 for (i = 1; i < g.numColumns(); i++) {
652 if (!includeSeries[i]) continue;
653 var series = dataHandler.extractSeries(g.rawData_, i, options);
654 if (g.rollPeriod() > 1) {
655 series = dataHandler.rollingAverage(series, g.rollPeriod(), options);
656 }
657
658 rolledSeries.push(series);
659 }
660
661 var combinedSeries = [];
662 for (i = 0; i < rolledSeries[0].length; i++) {
663 var sum = 0;
664 var count = 0;
665 for (var j = 0; j < rolledSeries.length; j++) {
666 var y = rolledSeries[j][i][1];
667 if (y === null || isNaN(y)) continue;
668 count++;
669 sum += y;
670 }
671 combinedSeries.push([rolledSeries[0][i][0], sum / count]);
672 }
673
674 // Compute the y range.
675 var yMin = Number.MAX_VALUE;
676 var yMax = -Number.MAX_VALUE;
677 for (i = 0; i < combinedSeries.length; i++) {
678 var yVal = combinedSeries[i][1];
679 if (yVal !== null && isFinite(yVal) && (!logscale || yVal > 0)) {
680 yMin = Math.min(yMin, yVal);
681 yMax = Math.max(yMax, yVal);
682 }
683 }
684
685 // Convert Y data to log scale if needed.
686 // Also, expand the Y range to compress the mini plot a little.
687 var extraPercent = 0.25;
688 if (logscale) {
689 yMax = utils.log10(yMax);
690 yMax += yMax*extraPercent;
691 yMin = utils.log10(yMin);
692 for (i = 0; i < combinedSeries.length; i++) {
693 combinedSeries[i][1] = utils.log10(combinedSeries[i][1]);
694 }
695 } else {
696 var yExtra;
697 var yRange = yMax - yMin;
698 if (yRange <= Number.MIN_VALUE) {
699 yExtra = yMax*extraPercent;
700 } else {
701 yExtra = yRange*extraPercent;
702 }
703 yMax += yExtra;
704 yMin -= yExtra;
705 }
706
707 return {data: combinedSeries, yMin: yMin, yMax: yMax};
708};
709
710/**
711 * @private
712 * Places the zoom handles in the proper position based on the current X data window.
713 */
714rangeSelector.prototype.placeZoomHandles_ = function() {
715 var xExtremes = this.dygraph_.xAxisExtremes();
716 var xWindowLimits = this.dygraph_.xAxisRange();
717 var xRange = xExtremes[1] - xExtremes[0];
718 var leftPercent = Math.max(0, (xWindowLimits[0] - xExtremes[0])/xRange);
719 var rightPercent = Math.max(0, (xExtremes[1] - xWindowLimits[1])/xRange);
720 var leftCoord = this.canvasRect_.x + this.canvasRect_.w*leftPercent;
721 var rightCoord = this.canvasRect_.x + this.canvasRect_.w*(1 - rightPercent);
722 var handleTop = Math.max(this.canvasRect_.y, this.canvasRect_.y + (this.canvasRect_.h - this.leftZoomHandle_.height)/2);
723 var halfHandleWidth = this.leftZoomHandle_.width/2;
724 this.leftZoomHandle_.style.left = (leftCoord - halfHandleWidth) + 'px';
725 this.leftZoomHandle_.style.top = handleTop + 'px';
726 this.rightZoomHandle_.style.left = (rightCoord - halfHandleWidth) + 'px';
727 this.rightZoomHandle_.style.top = this.leftZoomHandle_.style.top;
728
729 this.leftZoomHandle_.style.visibility = 'visible';
730 this.rightZoomHandle_.style.visibility = 'visible';
731};
732
733/**
734 * @private
735 * Draws the interactive layer in the foreground canvas.
736 */
737rangeSelector.prototype.drawInteractiveLayer_ = function() {
738 var ctx = this.fgcanvas_ctx_;
739 ctx.clearRect(0, 0, this.canvasRect_.w, this.canvasRect_.h);
740 var margin = 1;
741 var width = this.canvasRect_.w - margin;
742 var height = this.canvasRect_.h - margin;
743 var zoomHandleStatus = this.getZoomHandleStatus_();
744
745 ctx.strokeStyle = this.getOption_('rangeSelectorForegroundStrokeColor');
746 ctx.lineWidth = this.getOption_('rangeSelectorForegroundLineWidth');
747 if (!zoomHandleStatus.isZoomed) {
748 ctx.beginPath();
749 ctx.moveTo(margin, margin);
750 ctx.lineTo(margin, height);
751 ctx.lineTo(width, height);
752 ctx.lineTo(width, margin);
753 ctx.stroke();
754 } else {
755 var leftHandleCanvasPos = Math.max(margin, zoomHandleStatus.leftHandlePos - this.canvasRect_.x);
756 var rightHandleCanvasPos = Math.min(width, zoomHandleStatus.rightHandlePos - this.canvasRect_.x);
757
758 ctx.fillStyle = 'rgba(240, 240, 240, ' + this.getOption_('rangeSelectorAlpha').toString() + ')';
759 ctx.fillRect(0, 0, leftHandleCanvasPos, this.canvasRect_.h);
760 ctx.fillRect(rightHandleCanvasPos, 0, this.canvasRect_.w - rightHandleCanvasPos, this.canvasRect_.h);
761
762 ctx.beginPath();
763 ctx.moveTo(margin, margin);
764 ctx.lineTo(leftHandleCanvasPos, margin);
765 ctx.lineTo(leftHandleCanvasPos, height);
766 ctx.lineTo(rightHandleCanvasPos, height);
767 ctx.lineTo(rightHandleCanvasPos, margin);
768 ctx.lineTo(width, margin);
769 ctx.stroke();
770 }
771};
772
773/**
774 * @private
775 * Returns the current zoom handle position information.
776 * @return {Object} The zoom handle status.
777 */
778rangeSelector.prototype.getZoomHandleStatus_ = function() {
779 var halfHandleWidth = this.leftZoomHandle_.width/2;
780 var leftHandlePos = parseFloat(this.leftZoomHandle_.style.left) + halfHandleWidth;
781 var rightHandlePos = parseFloat(this.rightZoomHandle_.style.left) + halfHandleWidth;
782 return {
783 leftHandlePos: leftHandlePos,
784 rightHandlePos: rightHandlePos,
785 isZoomed: (leftHandlePos - 1 > this.canvasRect_.x || rightHandlePos + 1 < this.canvasRect_.x+this.canvasRect_.w)
786 };
787};
788
789export default rangeSelector;