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