Commit | Line | Data |
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41da6a86 DV |
1 | /* |
2 | * @license | |
3 | * Copyright 2011 Paul Felix (paul.eric.felix@gmail.com) | |
4 | * MIT-licensed (http://opensource.org/licenses/MIT) | |
5 | */ | |
ccd9d7c2 PF |
6 | |
7 | /** | |
8 | * @fileoverview This file contains the DygraphRangeSelector class used to provide | |
9 | * a timeline range selector widget for dygraphs. | |
10 | */ | |
11 | ||
758a629f DV |
12 | /*jshint globalstrict: true */ |
13 | /*global Dygraph:false */ | |
c0f54d4f DV |
14 | "use strict"; |
15 | ||
ccd9d7c2 PF |
16 | /** |
17 | * The DygraphRangeSelector class provides a timeline range selector widget. | |
18 | * @param {Dygraph} dygraph The dygraph object | |
19 | * @constructor | |
20 | */ | |
c0f54d4f | 21 | var DygraphRangeSelector = function(dygraph) { |
ccd9d7c2 | 22 | this.isIE_ = /MSIE/.test(navigator.userAgent) && !window.opera; |
920208fb | 23 | this.isUsingExcanvas_ = dygraph.isUsingExcanvas_; |
ccd9d7c2 | 24 | this.dygraph_ = dygraph; |
73c5deff PF |
25 | this.hasTouchInterface_ = typeof(TouchEvent) != 'undefined'; |
26 | this.isMobileDevice_ = Math.min(screen.width, screen.height) < 480; | |
ccd9d7c2 | 27 | this.createCanvases_(); |
920208fb PF |
28 | if (this.isUsingExcanvas_) { |
29 | this.createIEPanOverlay_(); | |
30 | } | |
ccd9d7c2 PF |
31 | this.createZoomHandles_(); |
32 | this.initInteraction_(); | |
33 | }; | |
34 | ||
35 | /** | |
36 | * Adds the range selector to the dygraph. | |
37 | * @param {Object} graphDiv The container div for the range selector. | |
38 | * @param {DygraphLayout} layout The DygraphLayout object for this graph. | |
39 | */ | |
40 | DygraphRangeSelector.prototype.addToGraph = function(graphDiv, layout) { | |
41 | this.layout_ = layout; | |
42 | this.resize_(); | |
43 | graphDiv.appendChild(this.bgcanvas_); | |
44 | graphDiv.appendChild(this.fgcanvas_); | |
45 | graphDiv.appendChild(this.leftZoomHandle_); | |
46 | graphDiv.appendChild(this.rightZoomHandle_); | |
47 | }; | |
48 | ||
49 | /** | |
50 | * Renders the static background portion of the range selector. | |
51 | */ | |
52 | DygraphRangeSelector.prototype.renderStaticLayer = function() { | |
53 | this.resize_(); | |
54 | this.drawStaticLayer_(); | |
55 | }; | |
56 | ||
57 | /** | |
58 | * Renders the interactive foreground portion of the range selector. | |
59 | */ | |
60 | DygraphRangeSelector.prototype.renderInteractiveLayer = function() { | |
61 | if (this.isChangingRange_) { | |
62 | return; | |
63 | } | |
ccd9d7c2 PF |
64 | this.placeZoomHandles_(); |
65 | this.drawInteractiveLayer_(); | |
66 | }; | |
67 | ||
68 | /** | |
69 | * @private | |
70 | * Resizes the range selector. | |
71 | */ | |
72 | DygraphRangeSelector.prototype.resize_ = function() { | |
920208fb | 73 | function setElementRect(canvas, rect) { |
ccd9d7c2 PF |
74 | canvas.style.top = rect.y + 'px'; |
75 | canvas.style.left = rect.x + 'px'; | |
76 | canvas.width = rect.w; | |
77 | canvas.height = rect.h; | |
78 | canvas.style.width = canvas.width + 'px'; // for IE | |
79 | canvas.style.height = canvas.height + 'px'; // for IE | |
758a629f | 80 | } |
ccd9d7c2 | 81 | |
70be5ed1 | 82 | var plotArea = this.layout_.getPlotArea(); |
ccd9d7c2 PF |
83 | var xAxisLabelHeight = this.attr_('axisLabelFontSize') + 2 * this.attr_('axisTickSize'); |
84 | this.canvasRect_ = { | |
85 | x: plotArea.x, | |
86 | y: plotArea.y + plotArea.h + xAxisLabelHeight + 4, | |
87 | w: plotArea.w, | |
88 | h: this.attr_('rangeSelectorHeight') | |
89 | }; | |
90 | ||
920208fb PF |
91 | setElementRect(this.bgcanvas_, this.canvasRect_); |
92 | setElementRect(this.fgcanvas_, this.canvasRect_); | |
ccd9d7c2 PF |
93 | }; |
94 | ||
95 | DygraphRangeSelector.prototype.attr_ = function(name) { | |
96 | return this.dygraph_.attr_(name); | |
97 | }; | |
98 | ||
99 | /** | |
100 | * @private | |
101 | * Creates the background and foreground canvases. | |
102 | */ | |
103 | DygraphRangeSelector.prototype.createCanvases_ = function() { | |
104 | this.bgcanvas_ = Dygraph.createCanvas(); | |
88c4a47e | 105 | this.bgcanvas_.className = 'dygraph-rangesel-bgcanvas'; |
ccd9d7c2 | 106 | this.bgcanvas_.style.position = 'absolute'; |
920208fb | 107 | this.bgcanvas_.style.zIndex = 9; |
ccd9d7c2 PF |
108 | this.bgcanvas_ctx_ = Dygraph.getContext(this.bgcanvas_); |
109 | ||
110 | this.fgcanvas_ = Dygraph.createCanvas(); | |
88c4a47e | 111 | this.fgcanvas_.className = 'dygraph-rangesel-fgcanvas'; |
ccd9d7c2 | 112 | this.fgcanvas_.style.position = 'absolute'; |
920208fb | 113 | this.fgcanvas_.style.zIndex = 9; |
ccd9d7c2 PF |
114 | this.fgcanvas_.style.cursor = 'default'; |
115 | this.fgcanvas_ctx_ = Dygraph.getContext(this.fgcanvas_); | |
116 | }; | |
117 | ||
118 | /** | |
119 | * @private | |
920208fb PF |
120 | * Creates overlay divs for IE/Excanvas so that mouse events are handled properly. |
121 | */ | |
122 | DygraphRangeSelector.prototype.createIEPanOverlay_ = function() { | |
123 | this.iePanOverlay_ = document.createElement("div"); | |
124 | this.iePanOverlay_.style.position = 'absolute'; | |
125 | this.iePanOverlay_.style.backgroundColor = 'white'; | |
126 | this.iePanOverlay_.style.filter = 'alpha(opacity=0)'; | |
127 | this.iePanOverlay_.style.display = 'none'; | |
128 | this.iePanOverlay_.style.cursor = 'move'; | |
129 | this.fgcanvas_.appendChild(this.iePanOverlay_); | |
130 | }; | |
131 | ||
132 | /** | |
133 | * @private | |
ccd9d7c2 PF |
134 | * Creates the zoom handle elements. |
135 | */ | |
136 | DygraphRangeSelector.prototype.createZoomHandles_ = function() { | |
137 | var img = new Image(); | |
88c4a47e | 138 | img.className = 'dygraph-rangesel-zoomhandle'; |
ccd9d7c2 | 139 | img.style.position = 'absolute'; |
920208fb | 140 | img.style.zIndex = 10; |
ccd9d7c2 PF |
141 | img.style.visibility = 'hidden'; // Initially hidden so they don't show up in the wrong place. |
142 | img.style.cursor = 'col-resize'; | |
73c5deff | 143 | |
920208fb | 144 | if (/MSIE 7/.test(navigator.userAgent)) { // IE7 doesn't support embedded src data. |
73c5deff PF |
145 | img.width = 7; |
146 | img.height = 14; | |
147 | img.style.backgroundColor = 'white'; | |
148 | img.style.border = '1px solid #333333'; // Just show box in IE7. | |
920208fb | 149 | } else { |
73c5deff PF |
150 | img.width = 9; |
151 | img.height = 16; | |
152 | img.src = 'data:image/png;base64,' + | |
758a629f DV |
153 | 'iVBORw0KGgoAAAANSUhEUgAAAAkAAAAQCAYAAADESFVDAAAAAXNSR0IArs4c6QAAAAZiS0dEANAA' + |
154 | 'zwDP4Z7KegAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAAd0SU1FB9sHGw0cMqdt1UwAAAAZdEVYdENv' + | |
155 | 'bW1lbnQAQ3JlYXRlZCB3aXRoIEdJTVBXgQ4XAAAAaElEQVQoz+3SsRFAQBCF4Z9WJM8KCDVwownl' + | |
156 | '6YXsTmCUsyKGkZzcl7zkz3YLkypgAnreFmDEpHkIwVOMfpdi9CEEN2nGpFdwD03yEqDtOgCaun7s' + | |
157 | 'qSTDH32I1pQA2Pb9sZecAxc5r3IAb21d6878xsAAAAAASUVORK5CYII='; | |
920208fb | 158 | } |
ccd9d7c2 | 159 | |
73c5deff PF |
160 | var minScreenDim = Math.min(screen.width, screen.height); |
161 | if (minScreenDim < 480) { | |
162 | img.width *= 3; | |
163 | img.height *= 3; | |
164 | } else if (minScreenDim < 768) { | |
165 | img.width *= 2; | |
166 | img.height *= 2; | |
167 | } | |
168 | ||
ccd9d7c2 PF |
169 | this.leftZoomHandle_ = img; |
170 | this.rightZoomHandle_ = img.cloneNode(false); | |
171 | }; | |
172 | ||
173 | /** | |
174 | * @private | |
175 | * Sets up the interaction for the range selector. | |
176 | */ | |
177 | DygraphRangeSelector.prototype.initInteraction_ = function() { | |
178 | var self = this; | |
179 | var topElem = this.isIE_ ? document : window; | |
180 | var xLast = 0; | |
181 | var handle = null; | |
182 | var isZooming = false; | |
183 | var isPanning = false; | |
73c5deff | 184 | var dynamic = !this.isMobileDevice_ && !this.isUsingExcanvas_; |
ccd9d7c2 | 185 | |
758a629f DV |
186 | // functions, defined below. Defining them this way (rather than with |
187 | // "function foo() {...}" makes JSHint happy. | |
188 | var toXDataWindow, onZoomStart, onZoom, onZoomEnd, doZoom, isMouseInPanZone, | |
189 | onPanStart, onPan, onPanEnd, doPan, onCanvasMouseMove; | |
190 | ||
73c5deff PF |
191 | // Touch event functions |
192 | var onZoomHandleTouchEvent, onCanvasTouchEvent, addTouchEvents; | |
193 | ||
758a629f | 194 | toXDataWindow = function(zoomHandleStatus) { |
ccd9d7c2 PF |
195 | var xDataLimits = self.dygraph_.xAxisExtremes(); |
196 | var fact = (xDataLimits[1] - xDataLimits[0])/self.canvasRect_.w; | |
197 | var xDataMin = xDataLimits[0] + (zoomHandleStatus.leftHandlePos - self.canvasRect_.x)*fact; | |
198 | var xDataMax = xDataLimits[0] + (zoomHandleStatus.rightHandlePos - self.canvasRect_.x)*fact; | |
199 | return [xDataMin, xDataMax]; | |
200 | }; | |
201 | ||
758a629f | 202 | onZoomStart = function(e) { |
ccd9d7c2 PF |
203 | Dygraph.cancelEvent(e); |
204 | isZooming = true; | |
205 | xLast = e.screenX; | |
206 | handle = e.target ? e.target : e.srcElement; | |
6a4587ac RK |
207 | self.dygraph_.addEvent(topElem, 'mousemove', onZoom); |
208 | self.dygraph_.addEvent(topElem, 'mouseup', onZoomEnd); | |
ccd9d7c2 PF |
209 | self.fgcanvas_.style.cursor = 'col-resize'; |
210 | }; | |
211 | ||
758a629f | 212 | onZoom = function(e) { |
ccd9d7c2 PF |
213 | if (!isZooming) { |
214 | return; | |
215 | } | |
216 | var delX = e.screenX - xLast; | |
217 | if (Math.abs(delX) < 4) { | |
218 | return; | |
219 | } | |
220 | xLast = e.screenX; | |
221 | var zoomHandleStatus = self.getZoomHandleStatus_(); | |
758a629f | 222 | var newPos; |
ccd9d7c2 | 223 | if (handle == self.leftZoomHandle_) { |
758a629f | 224 | newPos = zoomHandleStatus.leftHandlePos + delX; |
ccd9d7c2 PF |
225 | newPos = Math.min(newPos, zoomHandleStatus.rightHandlePos - handle.width - 3); |
226 | newPos = Math.max(newPos, self.canvasRect_.x); | |
227 | } else { | |
758a629f | 228 | newPos = zoomHandleStatus.rightHandlePos + delX; |
ccd9d7c2 PF |
229 | newPos = Math.min(newPos, self.canvasRect_.x + self.canvasRect_.w); |
230 | newPos = Math.max(newPos, zoomHandleStatus.leftHandlePos + handle.width + 3); | |
231 | } | |
920208fb | 232 | var halfHandleWidth = handle.width/2; |
ccd9d7c2 PF |
233 | handle.style.left = (newPos - halfHandleWidth) + 'px'; |
234 | self.drawInteractiveLayer_(); | |
235 | ||
236 | // Zoom on the fly (if not using excanvas). | |
73c5deff | 237 | if (dynamic) { |
ccd9d7c2 PF |
238 | doZoom(); |
239 | } | |
240 | }; | |
241 | ||
758a629f | 242 | onZoomEnd = function(e) { |
ccd9d7c2 PF |
243 | if (!isZooming) { |
244 | return; | |
245 | } | |
246 | isZooming = false; | |
247 | Dygraph.removeEvent(topElem, 'mousemove', onZoom); | |
248 | Dygraph.removeEvent(topElem, 'mouseup', onZoomEnd); | |
249 | self.fgcanvas_.style.cursor = 'default'; | |
250 | ||
251 | // If using excanvas, Zoom now. | |
73c5deff | 252 | if (!dynamic) { |
ccd9d7c2 PF |
253 | doZoom(); |
254 | } | |
255 | }; | |
256 | ||
758a629f | 257 | doZoom = function() { |
ccd9d7c2 PF |
258 | try { |
259 | var zoomHandleStatus = self.getZoomHandleStatus_(); | |
260 | self.isChangingRange_ = true; | |
261 | if (!zoomHandleStatus.isZoomed) { | |
262 | self.dygraph_.doUnzoom_(); | |
263 | } else { | |
264 | var xDataWindow = toXDataWindow(zoomHandleStatus); | |
265 | self.dygraph_.doZoomXDates_(xDataWindow[0], xDataWindow[1]); | |
266 | } | |
267 | } finally { | |
268 | self.isChangingRange_ = false; | |
269 | } | |
270 | }; | |
271 | ||
758a629f | 272 | isMouseInPanZone = function(e) { |
920208fb PF |
273 | if (self.isUsingExcanvas_) { |
274 | return e.srcElement == self.iePanOverlay_; | |
275 | } else { | |
73c5deff PF |
276 | var rect = self.leftZoomHandle_.getBoundingClientRect(); |
277 | var leftHandleClientX = rect.left + rect.width/2; | |
278 | rect = self.rightZoomHandle_.getBoundingClientRect(); | |
279 | var rightHandleClientX = rect.left + rect.width/2; | |
280 | return (e.clientX > leftHandleClientX && e.clientX < rightHandleClientX); | |
920208fb | 281 | } |
ccd9d7c2 PF |
282 | }; |
283 | ||
758a629f | 284 | onPanStart = function(e) { |
ccd9d7c2 PF |
285 | if (!isPanning && isMouseInPanZone(e) && self.getZoomHandleStatus_().isZoomed) { |
286 | Dygraph.cancelEvent(e); | |
287 | isPanning = true; | |
288 | xLast = e.screenX; | |
6a4587ac RK |
289 | self.dygraph_.addEvent(topElem, 'mousemove', onPan); |
290 | self.dygraph_.addEvent(topElem, 'mouseup', onPanEnd); | |
ccd9d7c2 PF |
291 | } |
292 | }; | |
293 | ||
758a629f | 294 | onPan = function(e) { |
ccd9d7c2 PF |
295 | if (!isPanning) { |
296 | return; | |
297 | } | |
920208fb | 298 | Dygraph.cancelEvent(e); |
ccd9d7c2 PF |
299 | |
300 | var delX = e.screenX - xLast; | |
301 | if (Math.abs(delX) < 4) { | |
302 | return; | |
303 | } | |
304 | xLast = e.screenX; | |
305 | ||
306 | // Move range view | |
307 | var zoomHandleStatus = self.getZoomHandleStatus_(); | |
308 | var leftHandlePos = zoomHandleStatus.leftHandlePos; | |
309 | var rightHandlePos = zoomHandleStatus.rightHandlePos; | |
310 | var rangeSize = rightHandlePos - leftHandlePos; | |
311 | if (leftHandlePos + delX <= self.canvasRect_.x) { | |
312 | leftHandlePos = self.canvasRect_.x; | |
313 | rightHandlePos = leftHandlePos + rangeSize; | |
314 | } else if (rightHandlePos + delX >= self.canvasRect_.x + self.canvasRect_.w) { | |
315 | rightHandlePos = self.canvasRect_.x + self.canvasRect_.w; | |
316 | leftHandlePos = rightHandlePos - rangeSize; | |
317 | } else { | |
318 | leftHandlePos += delX; | |
319 | rightHandlePos += delX; | |
320 | } | |
920208fb | 321 | var halfHandleWidth = self.leftZoomHandle_.width/2; |
ccd9d7c2 PF |
322 | self.leftZoomHandle_.style.left = (leftHandlePos - halfHandleWidth) + 'px'; |
323 | self.rightZoomHandle_.style.left = (rightHandlePos - halfHandleWidth) + 'px'; | |
324 | self.drawInteractiveLayer_(); | |
325 | ||
326 | // Do pan on the fly (if not using excanvas). | |
73c5deff | 327 | if (dynamic) { |
ccd9d7c2 PF |
328 | doPan(); |
329 | } | |
330 | }; | |
331 | ||
758a629f | 332 | onPanEnd = function(e) { |
ccd9d7c2 PF |
333 | if (!isPanning) { |
334 | return; | |
335 | } | |
336 | isPanning = false; | |
337 | Dygraph.removeEvent(topElem, 'mousemove', onPan); | |
338 | Dygraph.removeEvent(topElem, 'mouseup', onPanEnd); | |
339 | // If using excanvas, do pan now. | |
73c5deff | 340 | if (!dynamic) { |
ccd9d7c2 PF |
341 | doPan(); |
342 | } | |
343 | }; | |
344 | ||
758a629f | 345 | doPan = function() { |
ccd9d7c2 PF |
346 | try { |
347 | self.isChangingRange_ = true; | |
348 | self.dygraph_.dateWindow_ = toXDataWindow(self.getZoomHandleStatus_()); | |
349 | self.dygraph_.drawGraph_(false); | |
350 | } finally { | |
351 | self.isChangingRange_ = false; | |
352 | } | |
353 | }; | |
354 | ||
758a629f | 355 | onCanvasMouseMove = function(e) { |
ccd9d7c2 PF |
356 | if (isZooming || isPanning) { |
357 | return; | |
358 | } | |
359 | var cursor = isMouseInPanZone(e) ? 'move' : 'default'; | |
360 | if (cursor != self.fgcanvas_.style.cursor) { | |
361 | self.fgcanvas_.style.cursor = cursor; | |
362 | } | |
363 | }; | |
364 | ||
73c5deff PF |
365 | onZoomHandleTouchEvent = function(e) { |
366 | e.preventDefault(); | |
367 | if (e.type == 'touchstart') { | |
368 | onZoomStart(e.targetTouches[0]); | |
369 | } else if (e.type == 'touchmove') { | |
370 | onZoom(e.targetTouches[0]); | |
371 | } else { | |
372 | onZoomEnd(e); | |
373 | } | |
374 | }; | |
375 | ||
376 | onCanvasTouchEvent = function(e) { | |
377 | e.preventDefault(); | |
378 | if (e.type == 'touchstart') { | |
379 | onPanStart(e.targetTouches[0]); | |
380 | } else if (e.type == 'touchmove') { | |
381 | onPan(e.targetTouches[0]); | |
382 | } else { | |
383 | onPanEnd(e); | |
384 | } | |
385 | }; | |
386 | ||
387 | addTouchEvents = function(elem, fn) { | |
6a4587ac RK |
388 | var types = ['touchstart', 'touchend', 'touchmove', 'touchcancel']; |
389 | for (var i = 0; i < types.length; i++) { | |
390 | self.dygraph_.addEvent(elem, types[i], fn); | |
391 | } | |
73c5deff PF |
392 | }; |
393 | ||
3417f017 DV |
394 | this.dygraph_.attrs_.interactionModel = |
395 | Dygraph.Interaction.dragIsPanInteractionModel; | |
758a629f | 396 | this.dygraph_.attrs_.panEdgeFraction = 0.0001; |
ccd9d7c2 | 397 | |
920208fb | 398 | var dragStartEvent = window.opera ? 'mousedown' : 'dragstart'; |
6a4587ac RK |
399 | this.dygraph_.addEvent(this.leftZoomHandle_, dragStartEvent, onZoomStart); |
400 | this.dygraph_.addEvent(this.rightZoomHandle_, dragStartEvent, onZoomStart); | |
920208fb PF |
401 | |
402 | if (this.isUsingExcanvas_) { | |
6a4587ac | 403 | this.dygraph_.addEvent(this.iePanOverlay_, 'mousedown', onPanStart); |
920208fb | 404 | } else { |
6a4587ac RK |
405 | this.dygraph_.addEvent(this.fgcanvas_, 'mousedown', onPanStart); |
406 | this.dygraph_.addEvent(this.fgcanvas_, 'mousemove', onCanvasMouseMove); | |
920208fb | 407 | } |
73c5deff PF |
408 | |
409 | // Touch events | |
410 | if (this.hasTouchInterface_) { | |
411 | addTouchEvents(this.leftZoomHandle_, onZoomHandleTouchEvent); | |
412 | addTouchEvents(this.rightZoomHandle_, onZoomHandleTouchEvent); | |
413 | addTouchEvents(this.fgcanvas_, onCanvasTouchEvent); | |
414 | } | |
ccd9d7c2 PF |
415 | }; |
416 | ||
417 | /** | |
418 | * @private | |
419 | * Draws the static layer in the background canvas. | |
420 | */ | |
421 | DygraphRangeSelector.prototype.drawStaticLayer_ = function() { | |
422 | var ctx = this.bgcanvas_ctx_; | |
423 | ctx.clearRect(0, 0, this.canvasRect_.w, this.canvasRect_.h); | |
ccd9d7c2 PF |
424 | try { |
425 | this.drawMiniPlot_(); | |
426 | } catch(ex) { | |
5061b42f | 427 | Dygraph.warn(ex); |
ccd9d7c2 | 428 | } |
920208fb | 429 | |
758a629f | 430 | var margin = 0.5; |
920208fb PF |
431 | this.bgcanvas_ctx_.lineWidth = 1; |
432 | ctx.strokeStyle = 'gray'; | |
433 | ctx.beginPath(); | |
434 | ctx.moveTo(margin, margin); | |
435 | ctx.lineTo(margin, this.canvasRect_.h-margin); | |
436 | ctx.lineTo(this.canvasRect_.w-margin, this.canvasRect_.h-margin); | |
437 | ctx.lineTo(this.canvasRect_.w-margin, margin); | |
438 | ctx.stroke(); | |
ccd9d7c2 PF |
439 | }; |
440 | ||
441 | ||
442 | /** | |
443 | * @private | |
444 | * Draws the mini plot in the background canvas. | |
445 | */ | |
446 | DygraphRangeSelector.prototype.drawMiniPlot_ = function() { | |
447 | var fillStyle = this.attr_('rangeSelectorPlotFillColor'); | |
448 | var strokeStyle = this.attr_('rangeSelectorPlotStrokeColor'); | |
449 | if (!fillStyle && !strokeStyle) { | |
450 | return; | |
451 | } | |
452 | ||
453 | var combinedSeriesData = this.computeCombinedSeriesAndLimits_(); | |
454 | var yRange = combinedSeriesData.yMax - combinedSeriesData.yMin; | |
455 | ||
456 | // Draw the mini plot. | |
457 | var ctx = this.bgcanvas_ctx_; | |
758a629f | 458 | var margin = 0.5; |
ccd9d7c2 PF |
459 | |
460 | var xExtremes = this.dygraph_.xAxisExtremes(); | |
461 | var xRange = Math.max(xExtremes[1] - xExtremes[0], 1.e-30); | |
462 | var xFact = (this.canvasRect_.w - margin)/xRange; | |
463 | var yFact = (this.canvasRect_.h - margin)/yRange; | |
464 | var canvasWidth = this.canvasRect_.w - margin; | |
465 | var canvasHeight = this.canvasRect_.h - margin; | |
466 | ||
467 | ctx.beginPath(); | |
468 | ctx.moveTo(margin, canvasHeight); | |
469 | for (var i = 0; i < combinedSeriesData.data.length; i++) { | |
470 | var dataPoint = combinedSeriesData.data[i]; | |
471 | var x = (dataPoint[0] - xExtremes[0])*xFact; | |
472 | var y = canvasHeight - (dataPoint[1] - combinedSeriesData.yMin)*yFact; | |
473 | if (isFinite(x) && isFinite(y)) { | |
474 | ctx.lineTo(x, y); | |
475 | } | |
476 | } | |
477 | ctx.lineTo(canvasWidth, canvasHeight); | |
478 | ctx.closePath(); | |
479 | ||
480 | if (fillStyle) { | |
481 | var lingrad = this.bgcanvas_ctx_.createLinearGradient(0, 0, 0, canvasHeight); | |
482 | lingrad.addColorStop(0, 'white'); | |
483 | lingrad.addColorStop(1, fillStyle); | |
484 | this.bgcanvas_ctx_.fillStyle = lingrad; | |
485 | ctx.fill(); | |
486 | } | |
487 | ||
488 | if (strokeStyle) { | |
489 | this.bgcanvas_ctx_.strokeStyle = strokeStyle; | |
490 | this.bgcanvas_ctx_.lineWidth = 1.5; | |
491 | ctx.stroke(); | |
492 | } | |
493 | }; | |
494 | ||
495 | /** | |
496 | * @private | |
497 | * Computes and returns the combinded series data along with min/max for the mini plot. | |
498 | * @return {Object} An object containing combinded series array, ymin, ymax. | |
499 | */ | |
500 | DygraphRangeSelector.prototype.computeCombinedSeriesAndLimits_ = function() { | |
501 | var data = this.dygraph_.rawData_; | |
502 | var logscale = this.attr_('logscale'); | |
503 | ||
504 | // Create a combined series (average of all series values). | |
505 | var combinedSeries = []; | |
506 | var sum; | |
507 | var count; | |
3810c27a | 508 | var mutipleValues; |
758a629f | 509 | var i, j, k; |
73c5deff | 510 | var xVal, yVal; |
ccd9d7c2 | 511 | |
3810c27a PF |
512 | // Find out if data has multiple values per datapoint. |
513 | // Go to first data point that actually has values (see http://code.google.com/p/dygraphs/issues/detail?id=246) | |
514 | for (i = 0; i < data.length; i++) { | |
73c5deff | 515 | if (data[i].length > 1 && data[i][1] !== null) { |
3810c27a PF |
516 | mutipleValues = typeof data[i][1] != 'number'; |
517 | if (mutipleValues) { | |
518 | sum = []; | |
519 | count = []; | |
0826981a | 520 | for (k = 0; k < data[i][1].length; k++) { |
3810c27a PF |
521 | sum.push(0); |
522 | count.push(0); | |
523 | } | |
524 | } | |
525 | break; | |
ccd9d7c2 | 526 | } |
ccd9d7c2 PF |
527 | } |
528 | ||
758a629f | 529 | for (i = 0; i < data.length; i++) { |
ccd9d7c2 | 530 | var dataPoint = data[i]; |
73c5deff | 531 | xVal = dataPoint[0]; |
ccd9d7c2 PF |
532 | |
533 | if (mutipleValues) { | |
758a629f | 534 | for (k = 0; k < sum.length; k++) { |
ccd9d7c2 PF |
535 | sum[k] = count[k] = 0; |
536 | } | |
537 | } else { | |
538 | sum = count = 0; | |
539 | } | |
540 | ||
758a629f | 541 | for (j = 1; j < dataPoint.length; j++) { |
ccd9d7c2 | 542 | if (this.dygraph_.visibility()[j-1]) { |
73c5deff | 543 | var y; |
ccd9d7c2 | 544 | if (mutipleValues) { |
758a629f DV |
545 | for (k = 0; k < sum.length; k++) { |
546 | y = dataPoint[j][k]; | |
547 | if (y === null || isNaN(y)) continue; | |
ccd9d7c2 PF |
548 | sum[k] += y; |
549 | count[k]++; | |
550 | } | |
551 | } else { | |
758a629f DV |
552 | y = dataPoint[j]; |
553 | if (y === null || isNaN(y)) continue; | |
ccd9d7c2 PF |
554 | sum += y; |
555 | count++; | |
556 | } | |
557 | } | |
558 | } | |
559 | ||
560 | if (mutipleValues) { | |
758a629f | 561 | for (k = 0; k < sum.length; k++) { |
ccd9d7c2 PF |
562 | sum[k] /= count[k]; |
563 | } | |
564 | yVal = sum.slice(0); | |
565 | } else { | |
566 | yVal = sum/count; | |
567 | } | |
568 | ||
569 | combinedSeries.push([xVal, yVal]); | |
570 | } | |
571 | ||
572 | // Account for roll period, fractions. | |
573 | combinedSeries = this.dygraph_.rollingAverage(combinedSeries, this.dygraph_.rollPeriod_); | |
574 | ||
575 | if (typeof combinedSeries[0][1] != 'number') { | |
758a629f DV |
576 | for (i = 0; i < combinedSeries.length; i++) { |
577 | yVal = combinedSeries[i][1]; | |
ccd9d7c2 PF |
578 | combinedSeries[i][1] = yVal[0]; |
579 | } | |
580 | } | |
581 | ||
582 | // Compute the y range. | |
583 | var yMin = Number.MAX_VALUE; | |
584 | var yMax = -Number.MAX_VALUE; | |
758a629f DV |
585 | for (i = 0; i < combinedSeries.length; i++) { |
586 | yVal = combinedSeries[i][1]; | |
587 | if (yVal !== null && isFinite(yVal) && (!logscale || yVal > 0)) { | |
ccd9d7c2 PF |
588 | yMin = Math.min(yMin, yVal); |
589 | yMax = Math.max(yMax, yVal); | |
590 | } | |
591 | } | |
592 | ||
593 | // Convert Y data to log scale if needed. | |
594 | // Also, expand the Y range to compress the mini plot a little. | |
758a629f | 595 | var extraPercent = 0.25; |
ccd9d7c2 PF |
596 | if (logscale) { |
597 | yMax = Dygraph.log10(yMax); | |
598 | yMax += yMax*extraPercent; | |
599 | yMin = Dygraph.log10(yMin); | |
758a629f | 600 | for (i = 0; i < combinedSeries.length; i++) { |
ccd9d7c2 PF |
601 | combinedSeries[i][1] = Dygraph.log10(combinedSeries[i][1]); |
602 | } | |
603 | } else { | |
604 | var yExtra; | |
5061b42f | 605 | var yRange = yMax - yMin; |
ccd9d7c2 PF |
606 | if (yRange <= Number.MIN_VALUE) { |
607 | yExtra = yMax*extraPercent; | |
608 | } else { | |
609 | yExtra = yRange*extraPercent; | |
610 | } | |
611 | yMax += yExtra; | |
612 | yMin -= yExtra; | |
613 | } | |
614 | ||
615 | return {data: combinedSeries, yMin: yMin, yMax: yMax}; | |
616 | }; | |
617 | ||
618 | /** | |
619 | * @private | |
620 | * Places the zoom handles in the proper position based on the current X data window. | |
621 | */ | |
622 | DygraphRangeSelector.prototype.placeZoomHandles_ = function() { | |
623 | var xExtremes = this.dygraph_.xAxisExtremes(); | |
624 | var xWindowLimits = this.dygraph_.xAxisRange(); | |
625 | var xRange = xExtremes[1] - xExtremes[0]; | |
626 | var leftPercent = Math.max(0, (xWindowLimits[0] - xExtremes[0])/xRange); | |
627 | var rightPercent = Math.max(0, (xExtremes[1] - xWindowLimits[1])/xRange); | |
628 | var leftCoord = this.canvasRect_.x + this.canvasRect_.w*leftPercent; | |
629 | var rightCoord = this.canvasRect_.x + this.canvasRect_.w*(1 - rightPercent); | |
920208fb PF |
630 | var handleTop = Math.max(this.canvasRect_.y, this.canvasRect_.y + (this.canvasRect_.h - this.leftZoomHandle_.height)/2); |
631 | var halfHandleWidth = this.leftZoomHandle_.width/2; | |
632 | this.leftZoomHandle_.style.left = (leftCoord - halfHandleWidth) + 'px'; | |
ccd9d7c2 | 633 | this.leftZoomHandle_.style.top = handleTop + 'px'; |
920208fb | 634 | this.rightZoomHandle_.style.left = (rightCoord - halfHandleWidth) + 'px'; |
ccd9d7c2 PF |
635 | this.rightZoomHandle_.style.top = this.leftZoomHandle_.style.top; |
636 | ||
637 | this.leftZoomHandle_.style.visibility = 'visible'; | |
638 | this.rightZoomHandle_.style.visibility = 'visible'; | |
639 | }; | |
640 | ||
641 | /** | |
642 | * @private | |
643 | * Draws the interactive layer in the foreground canvas. | |
644 | */ | |
645 | DygraphRangeSelector.prototype.drawInteractiveLayer_ = function() { | |
646 | var ctx = this.fgcanvas_ctx_; | |
647 | ctx.clearRect(0, 0, this.canvasRect_.w, this.canvasRect_.h); | |
648 | var margin = 1; | |
649 | var width = this.canvasRect_.w - margin; | |
650 | var height = this.canvasRect_.h - margin; | |
651 | var zoomHandleStatus = this.getZoomHandleStatus_(); | |
652 | ||
653 | ctx.strokeStyle = 'black'; | |
654 | if (!zoomHandleStatus.isZoomed) { | |
655 | ctx.beginPath(); | |
656 | ctx.moveTo(margin, margin); | |
657 | ctx.lineTo(margin, height); | |
658 | ctx.lineTo(width, height); | |
659 | ctx.lineTo(width, margin); | |
660 | ctx.stroke(); | |
920208fb PF |
661 | if (this.iePanOverlay_) { |
662 | this.iePanOverlay_.style.display = 'none'; | |
663 | } | |
ccd9d7c2 | 664 | } else { |
5061b42f DV |
665 | var leftHandleCanvasPos = Math.max(margin, zoomHandleStatus.leftHandlePos - this.canvasRect_.x); |
666 | var rightHandleCanvasPos = Math.min(width, zoomHandleStatus.rightHandlePos - this.canvasRect_.x); | |
ccd9d7c2 PF |
667 | |
668 | ctx.fillStyle = 'rgba(240, 240, 240, 0.6)'; | |
920208fb PF |
669 | ctx.fillRect(0, 0, leftHandleCanvasPos, this.canvasRect_.h); |
670 | ctx.fillRect(rightHandleCanvasPos, 0, this.canvasRect_.w - rightHandleCanvasPos, this.canvasRect_.h); | |
ccd9d7c2 PF |
671 | |
672 | ctx.beginPath(); | |
673 | ctx.moveTo(margin, margin); | |
674 | ctx.lineTo(leftHandleCanvasPos, margin); | |
675 | ctx.lineTo(leftHandleCanvasPos, height); | |
676 | ctx.lineTo(rightHandleCanvasPos, height); | |
677 | ctx.lineTo(rightHandleCanvasPos, margin); | |
678 | ctx.lineTo(width, margin); | |
679 | ctx.stroke(); | |
920208fb PF |
680 | |
681 | if (this.isUsingExcanvas_) { | |
682 | this.iePanOverlay_.style.width = (rightHandleCanvasPos - leftHandleCanvasPos) + 'px'; | |
683 | this.iePanOverlay_.style.left = leftHandleCanvasPos + 'px'; | |
684 | this.iePanOverlay_.style.height = height + 'px'; | |
685 | this.iePanOverlay_.style.display = 'inline'; | |
686 | } | |
ccd9d7c2 PF |
687 | } |
688 | }; | |
689 | ||
690 | /** | |
691 | * @private | |
692 | * Returns the current zoom handle position information. | |
693 | * @return {Object} The zoom handle status. | |
694 | */ | |
695 | DygraphRangeSelector.prototype.getZoomHandleStatus_ = function() { | |
920208fb | 696 | var halfHandleWidth = this.leftZoomHandle_.width/2; |
758a629f DV |
697 | var leftHandlePos = parseInt(this.leftZoomHandle_.style.left, 10) + halfHandleWidth; |
698 | var rightHandlePos = parseInt(this.rightZoomHandle_.style.left, 10) + halfHandleWidth; | |
ccd9d7c2 PF |
699 | return { |
700 | leftHandlePos: leftHandlePos, | |
701 | rightHandlePos: rightHandlePos, | |
702 | isZoomed: (leftHandlePos - 1 > this.canvasRect_.x || rightHandlePos + 1 < this.canvasRect_.x+this.canvasRect_.w) | |
703 | }; | |
704 | }; |