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88e95c46 DV |
1 | /** |
2 | * @license | |
3 | * Copyright 2006 Dan Vanderkam (danvdk@gmail.com) | |
4 | * MIT-licensed (http://opensource.org/licenses/MIT) | |
5 | */ | |
6a1aa64f DV |
6 | |
7 | /** | |
74a5af31 DV |
8 | * @fileoverview Based on PlotKit.CanvasRenderer, but modified to meet the |
9 | * needs of dygraphs. | |
10 | * | |
3df0ccf0 | 11 | * In particular, support for: |
0abfbd7e | 12 | * - grid overlays |
3df0ccf0 DV |
13 | * - error bars |
14 | * - dygraphs attribute system | |
6a1aa64f DV |
15 | */ |
16 | ||
6a1aa64f | 17 | /** |
423f5ed3 DV |
18 | * The DygraphCanvasRenderer class does the actual rendering of the chart onto |
19 | * a canvas. It's based on PlotKit.CanvasRenderer. | |
6a1aa64f | 20 | * @param {Object} element The canvas to attach to |
2cf95fff RK |
21 | * @param {Object} elementContext The 2d context of the canvas (injected so it |
22 | * can be mocked for testing.) | |
285a6bda | 23 | * @param {Layout} layout The DygraphLayout object for this graph. |
74a5af31 | 24 | * @constructor |
6a1aa64f | 25 | */ |
c0f54d4f | 26 | |
758a629f DV |
27 | /*jshint globalstrict: true */ |
28 | /*global Dygraph:false,RGBColor:false */ | |
c0f54d4f DV |
29 | "use strict"; |
30 | ||
79253bd0 | 31 | |
8cfe592f DV |
32 | /** |
33 | * @constructor | |
34 | * | |
35 | * This gets called when there are "new points" to chart. This is generally the | |
36 | * case when the underlying data being charted has changed. It is _not_ called | |
37 | * in the common case that the user has zoomed or is panning the view. | |
38 | * | |
39 | * The chart canvas has already been created by the Dygraph object. The | |
40 | * renderer simply gets a drawing context. | |
41 | * | |
42 | * @param {Dyraph} dygraph The chart to which this renderer belongs. | |
43 | * @param {Canvas} element The <canvas> DOM element on which to draw. | |
44 | * @param {CanvasRenderingContext2D} elementContext The drawing context. | |
45 | * @param {DygraphLayout} layout The chart's DygraphLayout object. | |
46 | * | |
47 | * TODO(danvk): remove the elementContext property. | |
48 | */ | |
c0f54d4f | 49 | var DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) { |
9317362d | 50 | this.dygraph_ = dygraph; |
fbe31dc8 | 51 | |
fbe31dc8 | 52 | this.layout = layout; |
b0c3b730 | 53 | this.element = element; |
2cf95fff | 54 | this.elementContext = elementContext; |
fbe31dc8 DV |
55 | this.container = this.element.parentNode; |
56 | ||
fbe31dc8 DV |
57 | this.height = this.element.height; |
58 | this.width = this.element.width; | |
59 | ||
60 | // --- check whether everything is ok before we return | |
61 | if (!this.isIE && !(DygraphCanvasRenderer.isSupported(this.element))) | |
62 | throw "Canvas is not supported."; | |
63 | ||
64 | // internal state | |
758a629f DV |
65 | this.xlabels = []; |
66 | this.ylabels = []; | |
67 | this.annotations = []; | |
ad1798c2 | 68 | this.chartLabels = {}; |
fbe31dc8 | 69 | |
70be5ed1 | 70 | this.area = layout.getPlotArea(); |
423f5ed3 DV |
71 | this.container.style.position = "relative"; |
72 | this.container.style.width = this.width + "px"; | |
73 | ||
74 | // Set up a clipping area for the canvas (and the interaction canvas). | |
75 | // This ensures that we don't overdraw. | |
920208fb PF |
76 | if (this.dygraph_.isUsingExcanvas_) { |
77 | this._createIEClipArea(); | |
78 | } else { | |
971870e5 DV |
79 | // on Android 3 and 4, setting a clipping area on a canvas prevents it from |
80 | // displaying anything. | |
81 | if (!Dygraph.isAndroid()) { | |
82 | var ctx = this.dygraph_.canvas_ctx_; | |
83 | ctx.beginPath(); | |
84 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
85 | ctx.clip(); | |
920208fb | 86 | |
971870e5 DV |
87 | ctx = this.dygraph_.hidden_ctx_; |
88 | ctx.beginPath(); | |
89 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
90 | ctx.clip(); | |
91 | } | |
920208fb | 92 | } |
423f5ed3 DV |
93 | }; |
94 | ||
95 | DygraphCanvasRenderer.prototype.attr_ = function(x) { | |
96 | return this.dygraph_.attr_(x); | |
97 | }; | |
98 | ||
8cfe592f DV |
99 | /** |
100 | * Clears out all chart content and DOM elements. | |
101 | * This is called immediately before render() on every frame, including | |
102 | * during zooms and pans. | |
103 | * @private | |
104 | */ | |
fbe31dc8 | 105 | DygraphCanvasRenderer.prototype.clear = function() { |
758a629f | 106 | var context; |
fbe31dc8 DV |
107 | if (this.isIE) { |
108 | // VML takes a while to start up, so we just poll every this.IEDelay | |
109 | try { | |
110 | if (this.clearDelay) { | |
111 | this.clearDelay.cancel(); | |
112 | this.clearDelay = null; | |
113 | } | |
758a629f | 114 | context = this.elementContext; |
fbe31dc8 DV |
115 | } |
116 | catch (e) { | |
76171648 | 117 | // TODO(danvk): this is broken, since MochiKit.Async is gone. |
758a629f DV |
118 | // this.clearDelay = MochiKit.Async.wait(this.IEDelay); |
119 | // this.clearDelay.addCallback(bind(this.clear, this)); | |
fbe31dc8 DV |
120 | return; |
121 | } | |
122 | } | |
123 | ||
758a629f | 124 | context = this.elementContext; |
fbe31dc8 DV |
125 | context.clearRect(0, 0, this.width, this.height); |
126 | ||
758a629f DV |
127 | function removeArray(ary) { |
128 | for (var i = 0; i < ary.length; i++) { | |
129 | var el = ary[i]; | |
130 | if (el.parentNode) el.parentNode.removeChild(el); | |
131 | } | |
ce49c2fa | 132 | } |
758a629f DV |
133 | |
134 | removeArray(this.xlabels); | |
135 | removeArray(this.ylabels); | |
136 | removeArray(this.annotations); | |
137 | ||
ad1798c2 DV |
138 | for (var k in this.chartLabels) { |
139 | if (!this.chartLabels.hasOwnProperty(k)) continue; | |
140 | var el = this.chartLabels[k]; | |
141 | if (el.parentNode) el.parentNode.removeChild(el); | |
142 | } | |
758a629f DV |
143 | this.xlabels = []; |
144 | this.ylabels = []; | |
145 | this.annotations = []; | |
ad1798c2 | 146 | this.chartLabels = {}; |
fbe31dc8 DV |
147 | }; |
148 | ||
8cfe592f DV |
149 | /** |
150 | * Checks whether the browser supports the <canvas> tag. | |
151 | * @private | |
152 | */ | |
fbe31dc8 DV |
153 | DygraphCanvasRenderer.isSupported = function(canvasName) { |
154 | var canvas = null; | |
155 | try { | |
758a629f | 156 | if (typeof(canvasName) == 'undefined' || canvasName === null) { |
b0c3b730 | 157 | canvas = document.createElement("canvas"); |
758a629f | 158 | } else { |
b0c3b730 | 159 | canvas = canvasName; |
758a629f DV |
160 | } |
161 | canvas.getContext("2d"); | |
fbe31dc8 DV |
162 | } |
163 | catch (e) { | |
164 | var ie = navigator.appVersion.match(/MSIE (\d\.\d)/); | |
165 | var opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1); | |
166 | if ((!ie) || (ie[1] < 6) || (opera)) | |
167 | return false; | |
168 | return true; | |
169 | } | |
170 | return true; | |
6a1aa64f | 171 | }; |
6a1aa64f DV |
172 | |
173 | /** | |
600d841a DV |
174 | * @param { [String] } colors Array of color strings. Should have one entry for |
175 | * each series to be rendered. | |
176 | */ | |
177 | DygraphCanvasRenderer.prototype.setColors = function(colors) { | |
178 | this.colorScheme_ = colors; | |
179 | }; | |
180 | ||
181 | /** | |
8cfe592f DV |
182 | * This method is responsible for drawing everything on the chart, including |
183 | * lines, error bars, fills and axes. | |
184 | * It is called immediately after clear() on every frame, including during pans | |
185 | * and zooms. | |
186 | * @private | |
6a1aa64f | 187 | */ |
285a6bda | 188 | DygraphCanvasRenderer.prototype.render = function() { |
528ce7e5 DV |
189 | // Draw the new X/Y grid. Lines appear crisper when pixels are rounded to |
190 | // half-integers. This prevents them from drawing in two rows/cols. | |
2cf95fff | 191 | var ctx = this.elementContext; |
758a629f DV |
192 | function halfUp(x) { return Math.round(x) + 0.5; } |
193 | function halfDown(y){ return Math.round(y) - 0.5; } | |
e7746234 | 194 | |
423f5ed3 | 195 | if (this.attr_('underlayCallback')) { |
1e41bd2d DV |
196 | // NOTE: we pass the dygraph object to this callback twice to avoid breaking |
197 | // users who expect a deprecated form of this callback. | |
423f5ed3 | 198 | this.attr_('underlayCallback')(ctx, this.area, this.dygraph_, this.dygraph_); |
e7746234 EC |
199 | } |
200 | ||
758a629f | 201 | var x, y, i, ticks; |
423f5ed3 | 202 | if (this.attr_('drawYGrid')) { |
758a629f | 203 | ticks = this.layout.yticks; |
bbba718a | 204 | // TODO(konigsberg): I don't think these calls to save() have a corresponding restore(). |
6a1aa64f | 205 | ctx.save(); |
423f5ed3 | 206 | ctx.strokeStyle = this.attr_('gridLineColor'); |
990d6a35 | 207 | ctx.lineWidth = this.attr_('gridLineWidth'); |
758a629f | 208 | for (i = 0; i < ticks.length; i++) { |
880a574f | 209 | // TODO(danvk): allow secondary axes to draw a grid, too. |
758a629f DV |
210 | if (ticks[i][0] !== 0) continue; |
211 | x = halfUp(this.area.x); | |
212 | y = halfDown(this.area.y + ticks[i][1] * this.area.h); | |
6a1aa64f DV |
213 | ctx.beginPath(); |
214 | ctx.moveTo(x, y); | |
215 | ctx.lineTo(x + this.area.w, y); | |
216 | ctx.closePath(); | |
217 | ctx.stroke(); | |
218 | } | |
6bf4df7f | 219 | ctx.restore(); |
6a1aa64f DV |
220 | } |
221 | ||
423f5ed3 | 222 | if (this.attr_('drawXGrid')) { |
758a629f | 223 | ticks = this.layout.xticks; |
6a1aa64f | 224 | ctx.save(); |
423f5ed3 | 225 | ctx.strokeStyle = this.attr_('gridLineColor'); |
990d6a35 | 226 | ctx.lineWidth = this.attr_('gridLineWidth'); |
758a629f DV |
227 | for (i=0; i<ticks.length; i++) { |
228 | x = halfUp(this.area.x + ticks[i][0] * this.area.w); | |
229 | y = halfDown(this.area.y + this.area.h); | |
6a1aa64f | 230 | ctx.beginPath(); |
880a574f | 231 | ctx.moveTo(x, y); |
6a1aa64f DV |
232 | ctx.lineTo(x, this.area.y); |
233 | ctx.closePath(); | |
234 | ctx.stroke(); | |
235 | } | |
6bf4df7f | 236 | ctx.restore(); |
6a1aa64f | 237 | } |
2ce09b19 DV |
238 | |
239 | // Do the ordinary rendering, as before | |
2ce09b19 | 240 | this._renderLineChart(); |
fbe31dc8 | 241 | this._renderAxis(); |
6dca682f | 242 | // this._renderChartLabels(); |
ce49c2fa | 243 | this._renderAnnotations(); |
fbe31dc8 DV |
244 | }; |
245 | ||
920208fb PF |
246 | DygraphCanvasRenderer.prototype._createIEClipArea = function() { |
247 | var className = 'dygraph-clip-div'; | |
248 | var graphDiv = this.dygraph_.graphDiv; | |
249 | ||
250 | // Remove old clip divs. | |
251 | for (var i = graphDiv.childNodes.length-1; i >= 0; i--) { | |
252 | if (graphDiv.childNodes[i].className == className) { | |
253 | graphDiv.removeChild(graphDiv.childNodes[i]); | |
254 | } | |
255 | } | |
256 | ||
257 | // Determine background color to give clip divs. | |
258 | var backgroundColor = document.bgColor; | |
259 | var element = this.dygraph_.graphDiv; | |
260 | while (element != document) { | |
261 | var bgcolor = element.currentStyle.backgroundColor; | |
262 | if (bgcolor && bgcolor != 'transparent') { | |
263 | backgroundColor = bgcolor; | |
264 | break; | |
265 | } | |
266 | element = element.parentNode; | |
267 | } | |
268 | ||
269 | function createClipDiv(area) { | |
758a629f | 270 | if (area.w === 0 || area.h === 0) { |
920208fb PF |
271 | return; |
272 | } | |
273 | var elem = document.createElement('div'); | |
274 | elem.className = className; | |
275 | elem.style.backgroundColor = backgroundColor; | |
276 | elem.style.position = 'absolute'; | |
277 | elem.style.left = area.x + 'px'; | |
278 | elem.style.top = area.y + 'px'; | |
279 | elem.style.width = area.w + 'px'; | |
280 | elem.style.height = area.h + 'px'; | |
281 | graphDiv.appendChild(elem); | |
282 | } | |
283 | ||
284 | var plotArea = this.area; | |
285 | // Left side | |
758a629f DV |
286 | createClipDiv({ |
287 | x:0, y:0, | |
288 | w:plotArea.x, | |
289 | h:this.height | |
290 | }); | |
291 | ||
920208fb | 292 | // Top |
758a629f DV |
293 | createClipDiv({ |
294 | x: plotArea.x, y: 0, | |
295 | w: this.width - plotArea.x, | |
296 | h: plotArea.y | |
297 | }); | |
298 | ||
920208fb | 299 | // Right side |
758a629f DV |
300 | createClipDiv({ |
301 | x: plotArea.x + plotArea.w, y: 0, | |
302 | w: this.width-plotArea.x - plotArea.w, | |
303 | h: this.height | |
304 | }); | |
305 | ||
920208fb | 306 | // Bottom |
758a629f DV |
307 | createClipDiv({ |
308 | x: plotArea.x, | |
309 | y: plotArea.y + plotArea.h, | |
310 | w: this.width - plotArea.x, | |
311 | h: this.height - plotArea.h - plotArea.y | |
312 | }); | |
313 | }; | |
fbe31dc8 DV |
314 | |
315 | DygraphCanvasRenderer.prototype._renderAxis = function() { | |
423f5ed3 | 316 | if (!this.attr_('drawXAxis') && !this.attr_('drawYAxis')) return; |
fbe31dc8 | 317 | |
528ce7e5 | 318 | // Round pixels to half-integer boundaries for crisper drawing. |
758a629f DV |
319 | function halfUp(x) { return Math.round(x) + 0.5; } |
320 | function halfDown(y){ return Math.round(y) - 0.5; } | |
528ce7e5 | 321 | |
2cf95fff | 322 | var context = this.elementContext; |
fbe31dc8 | 323 | |
758a629f DV |
324 | var label, x, y, tick, i; |
325 | ||
34fedff8 | 326 | var labelStyle = { |
423f5ed3 DV |
327 | position: "absolute", |
328 | fontSize: this.attr_('axisLabelFontSize') + "px", | |
329 | zIndex: 10, | |
330 | color: this.attr_('axisLabelColor'), | |
331 | width: this.attr_('axisLabelWidth') + "px", | |
74a5af31 | 332 | // height: this.attr_('axisLabelFontSize') + 2 + "px", |
758a629f | 333 | lineHeight: "normal", // Something other than "normal" line-height screws up label positioning. |
423f5ed3 | 334 | overflow: "hidden" |
34fedff8 | 335 | }; |
48e614ac | 336 | var makeDiv = function(txt, axis, prec_axis) { |
34fedff8 DV |
337 | var div = document.createElement("div"); |
338 | for (var name in labelStyle) { | |
85b99f0b DV |
339 | if (labelStyle.hasOwnProperty(name)) { |
340 | div.style[name] = labelStyle[name]; | |
341 | } | |
fbe31dc8 | 342 | } |
ba451526 | 343 | var inner_div = document.createElement("div"); |
48e614ac DV |
344 | inner_div.className = 'dygraph-axis-label' + |
345 | ' dygraph-axis-label-' + axis + | |
346 | (prec_axis ? ' dygraph-axis-label-' + prec_axis : ''); | |
3bdf7140 | 347 | inner_div.innerHTML=txt; |
ba451526 | 348 | div.appendChild(inner_div); |
34fedff8 | 349 | return div; |
fbe31dc8 DV |
350 | }; |
351 | ||
352 | // axis lines | |
353 | context.save(); | |
423f5ed3 DV |
354 | context.strokeStyle = this.attr_('axisLineColor'); |
355 | context.lineWidth = this.attr_('axisLineWidth'); | |
fbe31dc8 | 356 | |
423f5ed3 | 357 | if (this.attr_('drawYAxis')) { |
8b7a0cc3 | 358 | if (this.layout.yticks && this.layout.yticks.length > 0) { |
48e614ac | 359 | var num_axes = this.dygraph_.numAxes(); |
758a629f DV |
360 | for (i = 0; i < this.layout.yticks.length; i++) { |
361 | tick = this.layout.yticks[i]; | |
fbe31dc8 | 362 | if (typeof(tick) == "function") return; |
758a629f | 363 | x = this.area.x; |
880a574f | 364 | var sgn = 1; |
48e614ac | 365 | var prec_axis = 'y1'; |
880a574f DV |
366 | if (tick[0] == 1) { // right-side y-axis |
367 | x = this.area.x + this.area.w; | |
368 | sgn = -1; | |
48e614ac | 369 | prec_axis = 'y2'; |
9012dd21 | 370 | } |
758a629f | 371 | y = this.area.y + tick[1] * this.area.h; |
920208fb PF |
372 | |
373 | /* Tick marks are currently clipped, so don't bother drawing them. | |
fbe31dc8 | 374 | context.beginPath(); |
528ce7e5 | 375 | context.moveTo(halfUp(x), halfDown(y)); |
0e23cfc6 | 376 | context.lineTo(halfUp(x - sgn * this.attr_('axisTickSize')), halfDown(y)); |
fbe31dc8 DV |
377 | context.closePath(); |
378 | context.stroke(); | |
920208fb | 379 | */ |
fbe31dc8 | 380 | |
758a629f | 381 | label = makeDiv(tick[2], 'y', num_axes == 2 ? prec_axis : null); |
423f5ed3 | 382 | var top = (y - this.attr_('axisLabelFontSize') / 2); |
fbe31dc8 DV |
383 | if (top < 0) top = 0; |
384 | ||
423f5ed3 | 385 | if (top + this.attr_('axisLabelFontSize') + 3 > this.height) { |
fbe31dc8 DV |
386 | label.style.bottom = "0px"; |
387 | } else { | |
388 | label.style.top = top + "px"; | |
389 | } | |
758a629f | 390 | if (tick[0] === 0) { |
423f5ed3 | 391 | label.style.left = (this.area.x - this.attr_('yAxisLabelWidth') - this.attr_('axisTickSize')) + "px"; |
9012dd21 DV |
392 | label.style.textAlign = "right"; |
393 | } else if (tick[0] == 1) { | |
394 | label.style.left = (this.area.x + this.area.w + | |
423f5ed3 | 395 | this.attr_('axisTickSize')) + "px"; |
9012dd21 DV |
396 | label.style.textAlign = "left"; |
397 | } | |
423f5ed3 | 398 | label.style.width = this.attr_('yAxisLabelWidth') + "px"; |
b0c3b730 | 399 | this.container.appendChild(label); |
fbe31dc8 | 400 | this.ylabels.push(label); |
2160ed4a | 401 | } |
fbe31dc8 DV |
402 | |
403 | // The lowest tick on the y-axis often overlaps with the leftmost | |
404 | // tick on the x-axis. Shift the bottom tick up a little bit to | |
405 | // compensate if necessary. | |
406 | var bottomTick = this.ylabels[0]; | |
423f5ed3 | 407 | var fontSize = this.attr_('axisLabelFontSize'); |
758a629f | 408 | var bottom = parseInt(bottomTick.style.top, 10) + fontSize; |
fbe31dc8 | 409 | if (bottom > this.height - fontSize) { |
758a629f | 410 | bottomTick.style.top = (parseInt(bottomTick.style.top, 10) - |
fbe31dc8 DV |
411 | fontSize / 2) + "px"; |
412 | } | |
413 | } | |
414 | ||
528ce7e5 | 415 | // draw a vertical line on the left to separate the chart from the labels. |
f4b87da2 KW |
416 | var axisX; |
417 | if (this.attr_('drawAxesAtZero')) { | |
418 | var r = this.dygraph_.toPercentXCoord(0); | |
419 | if (r > 1 || r < 0) r = 0; | |
420 | axisX = halfUp(this.area.x + r * this.area.w); | |
421 | } else { | |
422 | axisX = halfUp(this.area.x); | |
423 | } | |
fbe31dc8 | 424 | context.beginPath(); |
f4b87da2 KW |
425 | context.moveTo(axisX, halfDown(this.area.y)); |
426 | context.lineTo(axisX, halfDown(this.area.y + this.area.h)); | |
fbe31dc8 DV |
427 | context.closePath(); |
428 | context.stroke(); | |
c1dbeb10 | 429 | |
528ce7e5 | 430 | // if there's a secondary y-axis, draw a vertical line for that, too. |
c1dbeb10 DV |
431 | if (this.dygraph_.numAxes() == 2) { |
432 | context.beginPath(); | |
528ce7e5 DV |
433 | context.moveTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y)); |
434 | context.lineTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); | |
c1dbeb10 DV |
435 | context.closePath(); |
436 | context.stroke(); | |
437 | } | |
fbe31dc8 DV |
438 | } |
439 | ||
423f5ed3 | 440 | if (this.attr_('drawXAxis')) { |
fbe31dc8 | 441 | if (this.layout.xticks) { |
758a629f DV |
442 | for (i = 0; i < this.layout.xticks.length; i++) { |
443 | tick = this.layout.xticks[i]; | |
444 | x = this.area.x + tick[0] * this.area.w; | |
445 | y = this.area.y + this.area.h; | |
920208fb PF |
446 | |
447 | /* Tick marks are currently clipped, so don't bother drawing them. | |
fbe31dc8 | 448 | context.beginPath(); |
528ce7e5 | 449 | context.moveTo(halfUp(x), halfDown(y)); |
423f5ed3 | 450 | context.lineTo(halfUp(x), halfDown(y + this.attr_('axisTickSize'))); |
fbe31dc8 DV |
451 | context.closePath(); |
452 | context.stroke(); | |
920208fb | 453 | */ |
fbe31dc8 | 454 | |
758a629f | 455 | label = makeDiv(tick[1], 'x'); |
fbe31dc8 | 456 | label.style.textAlign = "center"; |
423f5ed3 | 457 | label.style.top = (y + this.attr_('axisTickSize')) + 'px'; |
fbe31dc8 | 458 | |
423f5ed3 DV |
459 | var left = (x - this.attr_('axisLabelWidth')/2); |
460 | if (left + this.attr_('axisLabelWidth') > this.width) { | |
461 | left = this.width - this.attr_('xAxisLabelWidth'); | |
fbe31dc8 DV |
462 | label.style.textAlign = "right"; |
463 | } | |
464 | if (left < 0) { | |
465 | left = 0; | |
466 | label.style.textAlign = "left"; | |
467 | } | |
468 | ||
469 | label.style.left = left + "px"; | |
423f5ed3 | 470 | label.style.width = this.attr_('xAxisLabelWidth') + "px"; |
b0c3b730 | 471 | this.container.appendChild(label); |
fbe31dc8 | 472 | this.xlabels.push(label); |
2160ed4a | 473 | } |
fbe31dc8 DV |
474 | } |
475 | ||
476 | context.beginPath(); | |
f4b87da2 KW |
477 | var axisY; |
478 | if (this.attr_('drawAxesAtZero')) { | |
479 | var r = this.dygraph_.toPercentYCoord(0, 0); | |
480 | if (r > 1 || r < 0) r = 1; | |
481 | axisY = halfDown(this.area.y + r * this.area.h); | |
482 | } else { | |
483 | axisY = halfDown(this.area.y + this.area.h); | |
484 | } | |
485 | context.moveTo(halfUp(this.area.x), axisY); | |
486 | context.lineTo(halfUp(this.area.x + this.area.w), axisY); | |
fbe31dc8 DV |
487 | context.closePath(); |
488 | context.stroke(); | |
489 | } | |
490 | ||
491 | context.restore(); | |
6a1aa64f DV |
492 | }; |
493 | ||
fbe31dc8 | 494 | |
ad1798c2 | 495 | DygraphCanvasRenderer.prototype._renderChartLabels = function() { |
758a629f DV |
496 | var div, class_div; |
497 | ||
ad1798c2 DV |
498 | // Generate divs for the chart title, xlabel and ylabel. |
499 | // Space for these divs has already been taken away from the charting area in | |
500 | // the DygraphCanvasRenderer constructor. | |
501 | if (this.attr_('title')) { | |
758a629f | 502 | div = document.createElement("div"); |
ad1798c2 DV |
503 | div.style.position = 'absolute'; |
504 | div.style.top = '0px'; | |
505 | div.style.left = this.area.x + 'px'; | |
506 | div.style.width = this.area.w + 'px'; | |
507 | div.style.height = this.attr_('titleHeight') + 'px'; | |
508 | div.style.textAlign = 'center'; | |
b4202b3d | 509 | div.style.fontSize = (this.attr_('titleHeight') - 8) + 'px'; |
ad1798c2 | 510 | div.style.fontWeight = 'bold'; |
758a629f | 511 | class_div = document.createElement("div"); |
ca49434a DV |
512 | class_div.className = 'dygraph-label dygraph-title'; |
513 | class_div.innerHTML = this.attr_('title'); | |
514 | div.appendChild(class_div); | |
ad1798c2 DV |
515 | this.container.appendChild(div); |
516 | this.chartLabels.title = div; | |
517 | } | |
518 | ||
519 | if (this.attr_('xlabel')) { | |
758a629f | 520 | div = document.createElement("div"); |
ad1798c2 DV |
521 | div.style.position = 'absolute'; |
522 | div.style.bottom = 0; // TODO(danvk): this is lazy. Calculate style.top. | |
523 | div.style.left = this.area.x + 'px'; | |
524 | div.style.width = this.area.w + 'px'; | |
525 | div.style.height = this.attr_('xLabelHeight') + 'px'; | |
526 | div.style.textAlign = 'center'; | |
86cce9e8 | 527 | div.style.fontSize = (this.attr_('xLabelHeight') - 2) + 'px'; |
ca49434a | 528 | |
758a629f | 529 | class_div = document.createElement("div"); |
ca49434a DV |
530 | class_div.className = 'dygraph-label dygraph-xlabel'; |
531 | class_div.innerHTML = this.attr_('xlabel'); | |
532 | div.appendChild(class_div); | |
ad1798c2 DV |
533 | this.container.appendChild(div); |
534 | this.chartLabels.xlabel = div; | |
535 | } | |
536 | ||
d0c39108 DV |
537 | var that = this; |
538 | function createRotatedDiv(axis, classes, html) { | |
ad1798c2 DV |
539 | var box = { |
540 | left: 0, | |
d0c39108 DV |
541 | top: that.area.y, |
542 | width: that.attr_('yLabelWidth'), | |
543 | height: that.area.h | |
ad1798c2 | 544 | }; |
ca49434a | 545 | // TODO(danvk): is this outer div actually necessary? |
758a629f | 546 | div = document.createElement("div"); |
ad1798c2 | 547 | div.style.position = 'absolute'; |
d0c39108 DV |
548 | if (axis == 1) { |
549 | div.style.left = box.left; | |
550 | } else { | |
551 | div.style.right = box.left; | |
552 | } | |
ad1798c2 DV |
553 | div.style.top = box.top + 'px'; |
554 | div.style.width = box.width + 'px'; | |
555 | div.style.height = box.height + 'px'; | |
d0c39108 | 556 | div.style.fontSize = (that.attr_('yLabelWidth') - 2) + 'px'; |
ad1798c2 DV |
557 | |
558 | var inner_div = document.createElement("div"); | |
559 | inner_div.style.position = 'absolute'; | |
ad1798c2 DV |
560 | inner_div.style.width = box.height + 'px'; |
561 | inner_div.style.height = box.width + 'px'; | |
562 | inner_div.style.top = (box.height / 2 - box.width / 2) + 'px'; | |
563 | inner_div.style.left = (box.width / 2 - box.height / 2) + 'px'; | |
564 | inner_div.style.textAlign = 'center'; | |
b56b6993 DV |
565 | |
566 | // CSS rotation is an HTML5 feature which is not standardized. Hence every | |
567 | // browser has its own name for the CSS style. | |
d0c39108 DV |
568 | var val = 'rotate(' + (axis == 1 ? '-' : '') + '90deg)'; |
569 | inner_div.style.transform = val; // HTML5 | |
570 | inner_div.style.WebkitTransform = val; // Safari/Chrome | |
571 | inner_div.style.MozTransform = val; // Firefox | |
572 | inner_div.style.OTransform = val; // Opera | |
573 | inner_div.style.msTransform = val; // IE9 | |
b56b6993 DV |
574 | |
575 | if (typeof(document.documentMode) !== 'undefined' && | |
576 | document.documentMode < 9) { | |
577 | // We're dealing w/ an old version of IE, so we have to rotate the text | |
578 | // using a BasicImage transform. This uses a different origin of rotation | |
579 | // than HTML5 rotation (top left of div vs. its center). | |
580 | inner_div.style.filter = | |
d0c39108 DV |
581 | 'progid:DXImageTransform.Microsoft.BasicImage(rotation=' + |
582 | (axis == 1 ? '3' : '1') + ')'; | |
b56b6993 DV |
583 | inner_div.style.left = '0px'; |
584 | inner_div.style.top = '0px'; | |
585 | } | |
ad1798c2 | 586 | |
758a629f | 587 | class_div = document.createElement("div"); |
d0c39108 DV |
588 | class_div.className = classes; |
589 | class_div.innerHTML = html; | |
ca49434a DV |
590 | |
591 | inner_div.appendChild(class_div); | |
ad1798c2 | 592 | div.appendChild(inner_div); |
d0c39108 DV |
593 | return div; |
594 | } | |
595 | ||
596 | var div; | |
597 | if (this.attr_('ylabel')) { | |
598 | div = createRotatedDiv(1, 'dygraph-label dygraph-ylabel', | |
599 | this.attr_('ylabel')); | |
ad1798c2 DV |
600 | this.container.appendChild(div); |
601 | this.chartLabels.ylabel = div; | |
602 | } | |
107f9d8e | 603 | if (this.attr_('y2label') && this.dygraph_.numAxes() == 2) { |
d0c39108 DV |
604 | div = createRotatedDiv(2, 'dygraph-label dygraph-y2label', |
605 | this.attr_('y2label')); | |
606 | this.container.appendChild(div); | |
607 | this.chartLabels.y2label = div; | |
608 | } | |
ad1798c2 DV |
609 | }; |
610 | ||
611 | ||
ce49c2fa DV |
612 | DygraphCanvasRenderer.prototype._renderAnnotations = function() { |
613 | var annotationStyle = { | |
614 | "position": "absolute", | |
423f5ed3 | 615 | "fontSize": this.attr_('axisLabelFontSize') + "px", |
ce49c2fa | 616 | "zIndex": 10, |
3bf2fa91 | 617 | "overflow": "hidden" |
ce49c2fa DV |
618 | }; |
619 | ||
ab5e5c75 DV |
620 | var bindEvt = function(eventName, classEventName, p, self) { |
621 | return function(e) { | |
622 | var a = p.annotation; | |
623 | if (a.hasOwnProperty(eventName)) { | |
624 | a[eventName](a, p, self.dygraph_, e); | |
625 | } else if (self.dygraph_.attr_(classEventName)) { | |
626 | self.dygraph_.attr_(classEventName)(a, p, self.dygraph_,e ); | |
627 | } | |
628 | }; | |
758a629f | 629 | }; |
ab5e5c75 | 630 | |
ce49c2fa DV |
631 | // Get a list of point with annotations. |
632 | var points = this.layout.annotated_points; | |
633 | for (var i = 0; i < points.length; i++) { | |
634 | var p = points[i]; | |
4c919f55 DV |
635 | if (p.canvasx < this.area.x || p.canvasx > this.area.x + this.area.w || |
636 | p.canvasy < this.area.y || p.canvasy > this.area.y + this.area.h) { | |
e6d53148 DV |
637 | continue; |
638 | } | |
639 | ||
ce5e8d36 DV |
640 | var a = p.annotation; |
641 | var tick_height = 6; | |
642 | if (a.hasOwnProperty("tickHeight")) { | |
643 | tick_height = a.tickHeight; | |
9a40897e DV |
644 | } |
645 | ||
ce49c2fa DV |
646 | var div = document.createElement("div"); |
647 | for (var name in annotationStyle) { | |
648 | if (annotationStyle.hasOwnProperty(name)) { | |
649 | div.style[name] = annotationStyle[name]; | |
650 | } | |
651 | } | |
ce5e8d36 DV |
652 | if (!a.hasOwnProperty('icon')) { |
653 | div.className = "dygraphDefaultAnnotation"; | |
654 | } | |
655 | if (a.hasOwnProperty('cssClass')) { | |
656 | div.className += " " + a.cssClass; | |
657 | } | |
658 | ||
a5ad69cc DV |
659 | var width = a.hasOwnProperty('width') ? a.width : 16; |
660 | var height = a.hasOwnProperty('height') ? a.height : 16; | |
ce5e8d36 DV |
661 | if (a.hasOwnProperty('icon')) { |
662 | var img = document.createElement("img"); | |
663 | img.src = a.icon; | |
33030f33 DV |
664 | img.width = width; |
665 | img.height = height; | |
ce5e8d36 DV |
666 | div.appendChild(img); |
667 | } else if (p.annotation.hasOwnProperty('shortText')) { | |
668 | div.appendChild(document.createTextNode(p.annotation.shortText)); | |
5c528fa2 | 669 | } |
ce5e8d36 | 670 | div.style.left = (p.canvasx - width / 2) + "px"; |
d14b9eed DV |
671 | if (a.attachAtBottom) { |
672 | div.style.top = (this.area.h - height - tick_height) + "px"; | |
673 | } else { | |
674 | div.style.top = (p.canvasy - height - tick_height) + "px"; | |
675 | } | |
ce5e8d36 DV |
676 | div.style.width = width + "px"; |
677 | div.style.height = height + "px"; | |
ce49c2fa DV |
678 | div.title = p.annotation.text; |
679 | div.style.color = this.colors[p.name]; | |
680 | div.style.borderColor = this.colors[p.name]; | |
e6d53148 | 681 | a.div = div; |
ab5e5c75 | 682 | |
6a4587ac | 683 | this.dygraph_.addEvent(div, 'click', |
9a40897e | 684 | bindEvt('clickHandler', 'annotationClickHandler', p, this)); |
6a4587ac | 685 | this.dygraph_.addEvent(div, 'mouseover', |
9a40897e | 686 | bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p, this)); |
6a4587ac | 687 | this.dygraph_.addEvent(div, 'mouseout', |
9a40897e | 688 | bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p, this)); |
6a4587ac | 689 | this.dygraph_.addEvent(div, 'dblclick', |
9a40897e | 690 | bindEvt('dblClickHandler', 'annotationDblClickHandler', p, this)); |
ab5e5c75 | 691 | |
ce49c2fa DV |
692 | this.container.appendChild(div); |
693 | this.annotations.push(div); | |
9a40897e | 694 | |
2cf95fff | 695 | var ctx = this.elementContext; |
9a40897e DV |
696 | ctx.strokeStyle = this.colors[p.name]; |
697 | ctx.beginPath(); | |
d14b9eed DV |
698 | if (!a.attachAtBottom) { |
699 | ctx.moveTo(p.canvasx, p.canvasy); | |
700 | ctx.lineTo(p.canvasx, p.canvasy - 2 - tick_height); | |
701 | } else { | |
702 | ctx.moveTo(p.canvasx, this.area.h); | |
703 | ctx.lineTo(p.canvasx, this.area.h - 2 - tick_height); | |
704 | } | |
9a40897e DV |
705 | ctx.closePath(); |
706 | ctx.stroke(); | |
ce49c2fa DV |
707 | } |
708 | }; | |
709 | ||
ccb0001c | 710 | /** |
8722284b RK |
711 | * Returns a predicate to be used with an iterator, which will |
712 | * iterate over points appropriately, depending on whether | |
713 | * connectSeparatedPoints is true. When it's false, the predicate will | |
714 | * skip over points with missing yVals. | |
ccb0001c | 715 | */ |
8722284b RK |
716 | DygraphCanvasRenderer._getIteratorPredicate = function(connectSeparatedPoints) { |
717 | return connectSeparatedPoints ? DygraphCanvasRenderer._predicateThatSkipsEmptyPoints : null; | |
718 | } | |
719 | ||
720 | DygraphCanvasRenderer._predicateThatSkipsEmptyPoints = | |
721 | function(array, idx) { return array[idx].yval !== null; } | |
04c104d7 | 722 | |
857a6931 | 723 | DygraphCanvasRenderer.prototype._drawStyledLine = function( |
5469113b KW |
724 | ctx, i, setName, color, strokeWidth, strokePattern, drawPoints, |
725 | drawPointCallback, pointSize) { | |
99a77a04 | 726 | // TODO(konigsberg): Compute attributes outside this method call. |
857a6931 KW |
727 | var stepPlot = this.attr_("stepPlot"); |
728 | var firstIndexInSet = this.layout.setPointsOffsets[i]; | |
729 | var setLength = this.layout.setPointsLengths[i]; | |
857a6931 | 730 | var points = this.layout.points; |
857a6931 KW |
731 | if (!Dygraph.isArrayLike(strokePattern)) { |
732 | strokePattern = null; | |
733 | } | |
a5a50727 | 734 | var drawGapPoints = this.dygraph_.attr_('drawGapEdgePoints', setName); |
857a6931 | 735 | |
b843b52c | 736 | ctx.save(); |
7d1afbb9 | 737 | |
7d1afbb9 | 738 | var iter = Dygraph.createIterator(points, firstIndexInSet, setLength, |
8722284b | 739 | DygraphCanvasRenderer._getIteratorPredicate(this.attr_("connectSeparatedPoints"))); |
7d1afbb9 | 740 | |
31f8e58b RK |
741 | var pointsOnLine; |
742 | var strategy; | |
743 | if (!strokePattern || strokePattern.length <= 1) { | |
744 | strategy = trivialStrategy(ctx, color, strokeWidth); | |
b843b52c | 745 | } else { |
31f8e58b | 746 | strategy = nonTrivialStrategy(this, ctx, color, strokeWidth, strokePattern); |
b843b52c | 747 | } |
31f8e58b RK |
748 | pointsOnLine = this._drawSeries(ctx, iter, strokeWidth, pointSize, drawPoints, drawGapPoints, stepPlot, strategy); |
749 | this._drawPointsOnLine(ctx, pointsOnLine, drawPointCallback, setName, color, pointSize); | |
750 | ||
b843b52c RK |
751 | ctx.restore(); |
752 | }; | |
753 | ||
31f8e58b RK |
754 | var nonTrivialStrategy = function(renderer, ctx, color, strokeWidth, strokePattern) { |
755 | return new function() { | |
756 | this.init = function() { }; | |
757 | this.finish = function() { }; | |
758 | this.startSegment = function() { | |
759 | ctx.beginPath(); | |
760 | ctx.strokeStyle = color; | |
761 | ctx.lineWidth = strokeWidth; | |
762 | }; | |
763 | this.endSegment = function() { | |
764 | ctx.stroke(); // should this include closePath? | |
765 | }; | |
766 | this.drawLine = function(x1, y1, x2, y2) { | |
767 | renderer._dashedLine(ctx, x1, y1, x2, y2, strokePattern); | |
768 | }; | |
769 | this.skipPixel = function(prevX, prevY, curX, curY) { | |
770 | // TODO(konigsberg): optimize with http://jsperf.com/math-round-vs-hack/6 ? | |
771 | return (Math.round(prevX) == Math.round(curX) && | |
772 | Math.round(prevY) == Math.round(curY)); | |
773 | }; | |
774 | }; | |
775 | }; | |
776 | ||
777 | var trivialStrategy = function(ctx, color, strokeWidth) { | |
778 | return new function() { | |
779 | this.init = function() { | |
780 | ctx.beginPath(); | |
781 | ctx.strokeStyle = color; | |
782 | ctx.lineWidth = strokeWidth; | |
783 | }; | |
784 | this.finish = function() { | |
785 | ctx.stroke(); // should this include closePath? | |
786 | }; | |
787 | this.startSegment = function() { }; | |
788 | this.endSegment = function() { }; | |
789 | this.drawLine = function(x1, y1, x2, y2) { | |
790 | ctx.moveTo(x1, y1); | |
791 | ctx.lineTo(x2, y2); | |
792 | }; | |
793 | // don't skip pixels. | |
794 | this.skipPixel = function() { | |
795 | return false; | |
796 | }; | |
797 | }; | |
798 | }; | |
799 | ||
a401ca8a RK |
800 | DygraphCanvasRenderer.prototype._drawPointsOnLine = function(ctx, pointsOnLine, drawPointCallback, setName, color, pointSize) { |
801 | for (var idx = 0; idx < pointsOnLine.length; idx++) { | |
802 | var cb = pointsOnLine[idx]; | |
803 | ctx.save(); | |
804 | drawPointCallback( | |
805 | this.dygraph_, setName, ctx, cb[0], cb[1], color, pointSize); | |
806 | ctx.restore(); | |
807 | } | |
808 | } | |
809 | ||
31f8e58b RK |
810 | DygraphCanvasRenderer.prototype._drawSeries = function( |
811 | ctx, iter, strokeWidth, pointSize, drawPoints, drawGapPoints, | |
812 | stepPlot, strategy) { | |
813 | ||
31f8e58b RK |
814 | var prevCanvasX = null; |
815 | var prevCanvasY = null; | |
816 | var nextCanvasY = null; | |
817 | var isIsolated; // true if this point is isolated (no line segments) | |
818 | var point; // the point being processed in the while loop | |
b843b52c | 819 | var pointsOnLine = []; // Array of [canvasx, canvasy] pairs. |
31f8e58b RK |
820 | var first = true; // the first cycle through the while loop |
821 | ||
822 | strategy.init(); | |
823 | ||
7d1afbb9 RK |
824 | while(iter.hasNext()) { |
825 | point = iter.next(); | |
a02978e2 | 826 | if (point.canvasy === null || point.canvasy != point.canvasy) { |
31f8e58b | 827 | if (stepPlot && prevCanvasX !== null) { |
857a6931 | 828 | // Draw a horizontal line to the start of the missing data |
31f8e58b RK |
829 | strategy.startSegment(); |
830 | strategy.drawLine(prevX, prevY, point.canvasx, prevY); | |
831 | strategy.endSegment(); | |
857a6931 | 832 | } |
31f8e58b | 833 | prevCanvasX = prevCanvasY = null; |
857a6931 | 834 | } else { |
31f8e58b | 835 | nextCanvasY = iter.hasNext() ? iter.peek().canvasy : null; |
a02978e2 RK |
836 | // TODO: we calculate isNullOrNaN for this point, and the next, and then, when |
837 | // we iterate, test for isNullOrNaN again. Why bother? | |
838 | var isNextCanvasYNullOrNaN = nextCanvasY === null || nextCanvasY != nextCanvasY; | |
839 | isIsolated = (!prevCanvasX && isNextCanvasYNullOrNaN); | |
19b84fe7 | 840 | if (drawGapPoints) { |
31f8e58b | 841 | // Also consider a point to be "isolated" if it's adjacent to a |
19b84fe7 | 842 | // null point, excluding the graph edges. |
31f8e58b | 843 | if ((!first && !prevCanvasX) || |
a02978e2 | 844 | (iter.hasNext() && isNextCanvasYNullOrNaN)) { |
19b84fe7 KW |
845 | isIsolated = true; |
846 | } | |
847 | } | |
31f8e58b RK |
848 | if (prevCanvasX !== null) { |
849 | if (strategy.skipPixel(prevCanvasX, prevCanvasY, point.canvasx, point.canvasy)) { | |
857a6931 KW |
850 | continue; |
851 | } | |
857a6931 | 852 | if (strokeWidth) { |
31f8e58b | 853 | strategy.startSegment(); |
857a6931 | 854 | if (stepPlot) { |
31f8e58b RK |
855 | strategy.drawLine(prevCanvasX, prevCanvasY, point.canvasx, prevCanvasY); |
856 | prevCanvasX = point.canvasx; | |
857a6931 | 857 | } |
31f8e58b RK |
858 | strategy.drawLine(prevCanvasX, prevCanvasY, point.canvasx, point.canvasy); |
859 | strategy.endSegment(); | |
b843b52c RK |
860 | } |
861 | } | |
b843b52c RK |
862 | if (drawPoints || isIsolated) { |
863 | pointsOnLine.push([point.canvasx, point.canvasy]); | |
864 | } | |
31f8e58b RK |
865 | prevCanvasX = point.canvasx; |
866 | prevCanvasY = point.canvasy; | |
b843b52c | 867 | } |
7d1afbb9 | 868 | first = false; |
b843b52c | 869 | } |
31f8e58b RK |
870 | strategy.finish(); |
871 | return pointsOnLine; | |
857a6931 KW |
872 | }; |
873 | ||
874 | DygraphCanvasRenderer.prototype._drawLine = function(ctx, i) { | |
875 | var setNames = this.layout.setNames; | |
876 | var setName = setNames[i]; | |
877 | ||
878 | var strokeWidth = this.dygraph_.attr_("strokeWidth", setName); | |
879 | var borderWidth = this.dygraph_.attr_("strokeBorderWidth", setName); | |
5469113b KW |
880 | var drawPointCallback = this.dygraph_.attr_("drawPointCallback", setName) || |
881 | Dygraph.Circles.DEFAULT; | |
99a77a04 | 882 | |
857a6931 | 883 | if (borderWidth && strokeWidth) { |
5469113b | 884 | this._drawStyledLine(ctx, i, setName, |
857a6931 KW |
885 | this.dygraph_.attr_("strokeBorderColor", setName), |
886 | strokeWidth + 2 * borderWidth, | |
887 | this.dygraph_.attr_("strokePattern", setName), | |
888 | this.dygraph_.attr_("drawPoints", setName), | |
5469113b | 889 | drawPointCallback, |
857a6931 KW |
890 | this.dygraph_.attr_("pointSize", setName)); |
891 | } | |
892 | ||
5469113b | 893 | this._drawStyledLine(ctx, i, setName, |
857a6931 KW |
894 | this.colors[setName], |
895 | strokeWidth, | |
896 | this.dygraph_.attr_("strokePattern", setName), | |
897 | this.dygraph_.attr_("drawPoints", setName), | |
5469113b | 898 | drawPointCallback, |
857a6931 KW |
899 | this.dygraph_.attr_("pointSize", setName)); |
900 | }; | |
ce49c2fa | 901 | |
6a1aa64f | 902 | /** |
758a629f DV |
903 | * Actually draw the lines chart, including error bars. |
904 | * TODO(danvk): split this into several smaller functions. | |
905 | * @private | |
6a1aa64f | 906 | */ |
285a6bda | 907 | DygraphCanvasRenderer.prototype._renderLineChart = function() { |
44c6bc29 | 908 | // TODO(danvk): use this.attr_ for many of these. |
857a6931 | 909 | var ctx = this.elementContext; |
423f5ed3 | 910 | var fillAlpha = this.attr_('fillAlpha'); |
e4182459 | 911 | var errorBars = this.attr_("errorBars") || this.attr_("customBars"); |
44c6bc29 | 912 | var fillGraph = this.attr_("fillGraph"); |
b2c9222a DV |
913 | var stackedGraph = this.attr_("stackedGraph"); |
914 | var stepPlot = this.attr_("stepPlot"); | |
c3e1495b AR |
915 | var points = this.layout.points; |
916 | var pointsLength = points.length; | |
8722284b | 917 | var point, i, prevX, prevY, prevYs, color, setName, newYs, err_color, rgb, yscale, axis; |
21d3323f | 918 | |
82c6fe4d | 919 | var setNames = this.layout.setNames; |
21d3323f | 920 | var setCount = setNames.length; |
6a1aa64f | 921 | |
0e23cfc6 | 922 | // TODO(danvk): Move this mapping into Dygraph and get it out of here. |
758a629f DV |
923 | this.colors = {}; |
924 | for (i = 0; i < setCount; i++) { | |
600d841a | 925 | this.colors[setNames[i]] = this.colorScheme_[i % this.colorScheme_.length]; |
f032c51d AV |
926 | } |
927 | ||
ff00d3e2 DV |
928 | // Update Points |
929 | // TODO(danvk): here | |
b843b52c RK |
930 | // |
931 | // TODO(bhs): this loop is a hot-spot for high-point-count charts. These | |
932 | // transformations can be pushed into the canvas via linear transformation | |
933 | // matrices. | |
758a629f DV |
934 | for (i = pointsLength; i--;) { |
935 | point = points[i]; | |
6a1aa64f DV |
936 | point.canvasx = this.area.w * point.x + this.area.x; |
937 | point.canvasy = this.area.h * point.y + this.area.y; | |
938 | } | |
6a1aa64f DV |
939 | |
940 | // create paths | |
80aaae18 | 941 | if (errorBars) { |
857a6931 | 942 | ctx.save(); |
6a834bbb DV |
943 | if (fillGraph) { |
944 | this.dygraph_.warn("Can't use fillGraph option with error bars"); | |
945 | } | |
946 | ||
758a629f DV |
947 | for (i = 0; i < setCount; i++) { |
948 | setName = setNames[i]; | |
949 | axis = this.dygraph_.axisPropertiesForSeries(setName); | |
950 | color = this.colors[setName]; | |
6a1aa64f | 951 | |
04c104d7 KW |
952 | var firstIndexInSet = this.layout.setPointsOffsets[i]; |
953 | var setLength = this.layout.setPointsLengths[i]; | |
04c104d7 | 954 | |
8722284b RK |
955 | var iter = Dygraph.createIterator(points, firstIndexInSet, setLength, |
956 | DygraphCanvasRenderer._getIteratorPredicate(this.attr_("connectSeparatedPoints"))); | |
04c104d7 | 957 | |
6a1aa64f | 958 | // setup graphics context |
758a629f DV |
959 | prevX = NaN; |
960 | prevY = NaN; | |
961 | prevYs = [-1, -1]; | |
962 | yscale = axis.yscale; | |
f474c2a3 | 963 | // should be same color as the lines but only 15% opaque. |
758a629f DV |
964 | rgb = new RGBColor(color); |
965 | err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + | |
43af96e7 | 966 | fillAlpha + ')'; |
f474c2a3 | 967 | ctx.fillStyle = err_color; |
05c9d0c4 | 968 | ctx.beginPath(); |
8722284b RK |
969 | while (iter.hasNext()) { |
970 | point = iter.next(); | |
04c104d7 | 971 | if (point.name == setName) { // TODO(klausw): this is always true |
e9fe4a2f | 972 | if (!Dygraph.isOK(point.y)) { |
56623f3b | 973 | prevX = NaN; |
ae85914a | 974 | continue; |
5011e7a1 | 975 | } |
ce49c2fa | 976 | |
3637724f | 977 | // TODO(danvk): here |
afdc483f | 978 | if (stepPlot) { |
758a629f | 979 | newYs = [ point.y_bottom, point.y_top ]; |
afdc483f NN |
980 | prevY = point.y; |
981 | } else { | |
758a629f | 982 | newYs = [ point.y_bottom, point.y_top ]; |
afdc483f | 983 | } |
6a1aa64f DV |
984 | newYs[0] = this.area.h * newYs[0] + this.area.y; |
985 | newYs[1] = this.area.h * newYs[1] + this.area.y; | |
56623f3b | 986 | if (!isNaN(prevX)) { |
afdc483f | 987 | if (stepPlot) { |
47600757 | 988 | ctx.moveTo(prevX, newYs[0]); |
afdc483f | 989 | } else { |
47600757 | 990 | ctx.moveTo(prevX, prevYs[0]); |
afdc483f | 991 | } |
5954ef32 DV |
992 | ctx.lineTo(point.canvasx, newYs[0]); |
993 | ctx.lineTo(point.canvasx, newYs[1]); | |
afdc483f | 994 | if (stepPlot) { |
47600757 | 995 | ctx.lineTo(prevX, newYs[1]); |
afdc483f | 996 | } else { |
47600757 | 997 | ctx.lineTo(prevX, prevYs[1]); |
afdc483f | 998 | } |
5954ef32 DV |
999 | ctx.closePath(); |
1000 | } | |
354e15ab | 1001 | prevYs = newYs; |
5954ef32 DV |
1002 | prevX = point.canvasx; |
1003 | } | |
1004 | } | |
1005 | ctx.fill(); | |
1006 | } | |
857a6931 | 1007 | ctx.restore(); |
5954ef32 | 1008 | } else if (fillGraph) { |
857a6931 | 1009 | ctx.save(); |
349dd9ba DW |
1010 | var baseline = {}; // for stacked graphs: baseline for filling |
1011 | var currBaseline; | |
354e15ab DE |
1012 | |
1013 | // process sets in reverse order (needed for stacked graphs) | |
758a629f DV |
1014 | for (i = setCount - 1; i >= 0; i--) { |
1015 | setName = setNames[i]; | |
1016 | color = this.colors[setName]; | |
1017 | axis = this.dygraph_.axisPropertiesForSeries(setName); | |
ea4942ed DV |
1018 | var axisY = 1.0 + axis.minyval * axis.yscale; |
1019 | if (axisY < 0.0) axisY = 0.0; | |
1020 | else if (axisY > 1.0) axisY = 1.0; | |
1021 | axisY = this.area.h * axisY + this.area.y; | |
04c104d7 KW |
1022 | var firstIndexInSet = this.layout.setPointsOffsets[i]; |
1023 | var setLength = this.layout.setPointsLengths[i]; | |
04c104d7 | 1024 | |
8722284b RK |
1025 | var iter = Dygraph.createIterator(points, firstIndexInSet, setLength, |
1026 | DygraphCanvasRenderer._getIteratorPredicate(this.attr_("connectSeparatedPoints"))); | |
5954ef32 DV |
1027 | |
1028 | // setup graphics context | |
758a629f DV |
1029 | prevX = NaN; |
1030 | prevYs = [-1, -1]; | |
1031 | yscale = axis.yscale; | |
5954ef32 | 1032 | // should be same color as the lines but only 15% opaque. |
758a629f DV |
1033 | rgb = new RGBColor(color); |
1034 | err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + | |
43af96e7 | 1035 | fillAlpha + ')'; |
5954ef32 DV |
1036 | ctx.fillStyle = err_color; |
1037 | ctx.beginPath(); | |
8722284b RK |
1038 | while(iter.hasNext()) { |
1039 | point = iter.next(); | |
04c104d7 | 1040 | if (point.name == setName) { // TODO(klausw): this is always true |
e9fe4a2f | 1041 | if (!Dygraph.isOK(point.y)) { |
56623f3b | 1042 | prevX = NaN; |
5954ef32 DV |
1043 | continue; |
1044 | } | |
354e15ab | 1045 | if (stackedGraph) { |
349dd9ba DW |
1046 | currBaseline = baseline[point.canvasx]; |
1047 | var lastY; | |
1048 | if (currBaseline === undefined) { | |
1049 | lastY = axisY; | |
1050 | } else { | |
1051 | if(stepPlot) { | |
1052 | lastY = currBaseline[0]; | |
1053 | } else { | |
1054 | lastY = currBaseline; | |
1055 | } | |
1056 | } | |
354e15ab | 1057 | newYs = [ point.canvasy, lastY ]; |
b843b52c | 1058 | |
349dd9ba DW |
1059 | if(stepPlot) { |
1060 | // Step plots must keep track of the top and bottom of | |
1061 | // the baseline at each point. | |
1062 | if(prevYs[0] === -1) { | |
1063 | baseline[point.canvasx] = [ point.canvasy, axisY ]; | |
1064 | } else { | |
1065 | baseline[point.canvasx] = [ point.canvasy, prevYs[0] ]; | |
1066 | } | |
1067 | } else { | |
1068 | baseline[point.canvasx] = point.canvasy; | |
1069 | } | |
b843b52c | 1070 | |
354e15ab DE |
1071 | } else { |
1072 | newYs = [ point.canvasy, axisY ]; | |
1073 | } | |
56623f3b | 1074 | if (!isNaN(prevX)) { |
05c9d0c4 | 1075 | ctx.moveTo(prevX, prevYs[0]); |
b843b52c | 1076 | |
afdc483f | 1077 | if (stepPlot) { |
47600757 | 1078 | ctx.lineTo(point.canvasx, prevYs[0]); |
349dd9ba DW |
1079 | if(currBaseline) { |
1080 | // Draw to the bottom of the baseline | |
1081 | ctx.lineTo(point.canvasx, currBaseline[1]); | |
1082 | } else { | |
1083 | ctx.lineTo(point.canvasx, newYs[1]); | |
1084 | } | |
afdc483f | 1085 | } else { |
47600757 | 1086 | ctx.lineTo(point.canvasx, newYs[0]); |
349dd9ba | 1087 | ctx.lineTo(point.canvasx, newYs[1]); |
afdc483f | 1088 | } |
b843b52c | 1089 | |
05c9d0c4 DV |
1090 | ctx.lineTo(prevX, prevYs[1]); |
1091 | ctx.closePath(); | |
6a1aa64f | 1092 | } |
354e15ab | 1093 | prevYs = newYs; |
6a1aa64f DV |
1094 | prevX = point.canvasx; |
1095 | } | |
05c9d0c4 | 1096 | } |
6a1aa64f DV |
1097 | ctx.fill(); |
1098 | } | |
857a6931 | 1099 | ctx.restore(); |
80aaae18 DV |
1100 | } |
1101 | ||
f9414b11 | 1102 | // Drawing the lines. |
758a629f | 1103 | for (i = 0; i < setCount; i += 1) { |
857a6931 | 1104 | this._drawLine(ctx, i); |
80aaae18 | 1105 | } |
6a1aa64f | 1106 | }; |
79253bd0 | 1107 | |
1108 | /** | |
1109 | * This does dashed lines onto a canvas for a given pattern. You must call | |
1110 | * ctx.stroke() after to actually draw it, much line ctx.lineTo(). It remembers | |
1111 | * the state of the line in regards to where we left off on drawing the pattern. | |
1112 | * You can draw a dashed line in several function calls and the pattern will be | |
1113 | * continous as long as you didn't call this function with a different pattern | |
1114 | * in between. | |
1115 | * @param ctx The canvas 2d context to draw on. | |
1116 | * @param x The start of the line's x coordinate. | |
1117 | * @param y The start of the line's y coordinate. | |
1118 | * @param x2 The end of the line's x coordinate. | |
1119 | * @param y2 The end of the line's y coordinate. | |
1120 | * @param pattern The dash pattern to draw, an array of integers where even | |
1121 | * index is drawn and odd index is not drawn (Ex. [10, 2, 5, 2], 10 is drawn 5 | |
1122 | * is drawn, 2 is the space between.). A null pattern, array of length one, or | |
1123 | * empty array will do just a solid line. | |
1124 | * @private | |
1125 | */ | |
1126 | DygraphCanvasRenderer.prototype._dashedLine = function(ctx, x, y, x2, y2, pattern) { | |
1127 | // Original version http://stackoverflow.com/questions/4576724/dotted-stroke-in-canvas | |
1128 | // Modified by Russell Valentine to keep line history and continue the pattern | |
1129 | // where it left off. | |
1130 | var dx, dy, len, rot, patternIndex, segment; | |
1131 | ||
1132 | // If we don't have a pattern or it is an empty array or of size one just | |
1133 | // do a solid line. | |
1134 | if (!pattern || pattern.length <= 1) { | |
1135 | ctx.moveTo(x, y); | |
1136 | ctx.lineTo(x2, y2); | |
1137 | return; | |
1138 | } | |
1139 | ||
1140 | // If we have a different dash pattern than the last time this was called we | |
1141 | // reset our dash history and start the pattern from the begging | |
1142 | // regardless of state of the last pattern. | |
1143 | if (!Dygraph.compareArrays(pattern, this._dashedLineToHistoryPattern)) { | |
1144 | this._dashedLineToHistoryPattern = pattern; | |
1145 | this._dashedLineToHistory = [0, 0]; | |
1146 | } | |
1147 | ctx.save(); | |
1148 | ||
1149 | // Calculate transformation parameters | |
1150 | dx = (x2-x); | |
1151 | dy = (y2-y); | |
1152 | len = Math.sqrt(dx*dx + dy*dy); | |
1153 | rot = Math.atan2(dy, dx); | |
1154 | ||
1155 | // Set transformation | |
1156 | ctx.translate(x, y); | |
1157 | ctx.moveTo(0, 0); | |
1158 | ctx.rotate(rot); | |
1159 | ||
1160 | // Set last pattern index we used for this pattern. | |
1161 | patternIndex = this._dashedLineToHistory[0]; | |
1162 | x = 0; | |
1163 | while (len > x) { | |
1164 | // Get the length of the pattern segment we are dealing with. | |
1165 | segment = pattern[patternIndex]; | |
1166 | // If our last draw didn't complete the pattern segment all the way we | |
1167 | // will try to finish it. Otherwise we will try to do the whole segment. | |
1168 | if (this._dashedLineToHistory[1]) { | |
1169 | x += this._dashedLineToHistory[1]; | |
1170 | } else { | |
1171 | x += segment; | |
1172 | } | |
1173 | if (x > len) { | |
1174 | // We were unable to complete this pattern index all the way, keep | |
1175 | // where we are the history so our next draw continues where we left off | |
1176 | // in the pattern. | |
1177 | this._dashedLineToHistory = [patternIndex, x-len]; | |
1178 | x = len; | |
1179 | } else { | |
1180 | // We completed this patternIndex, we put in the history that we are on | |
1181 | // the beginning of the next segment. | |
1182 | this._dashedLineToHistory = [(patternIndex+1)%pattern.length, 0]; | |
1183 | } | |
1184 | ||
1185 | // We do a line on a even pattern index and just move on a odd pattern index. | |
1186 | // The move is the empty space in the dash. | |
1187 | if(patternIndex % 2 === 0) { | |
1188 | ctx.lineTo(x, 0); | |
1189 | } else { | |
1190 | ctx.moveTo(x, 0); | |
1191 | } | |
1192 | // If we are not done, next loop process the next pattern segment, or the | |
1193 | // first segment again if we are at the end of the pattern. | |
1194 | patternIndex = (patternIndex+1) % pattern.length; | |
1195 | } | |
1196 | ctx.restore(); | |
1197 | }; |