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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 DV |
26 | |
27 | "use strict"; | |
28 | ||
29 | var DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) { | |
9317362d | 30 | this.dygraph_ = dygraph; |
fbe31dc8 | 31 | |
fbe31dc8 | 32 | this.layout = layout; |
b0c3b730 | 33 | this.element = element; |
2cf95fff | 34 | this.elementContext = elementContext; |
fbe31dc8 DV |
35 | this.container = this.element.parentNode; |
36 | ||
fbe31dc8 DV |
37 | this.height = this.element.height; |
38 | this.width = this.element.width; | |
39 | ||
40 | // --- check whether everything is ok before we return | |
41 | if (!this.isIE && !(DygraphCanvasRenderer.isSupported(this.element))) | |
42 | throw "Canvas is not supported."; | |
43 | ||
44 | // internal state | |
45 | this.xlabels = new Array(); | |
46 | this.ylabels = new Array(); | |
ce49c2fa | 47 | this.annotations = new Array(); |
ad1798c2 | 48 | this.chartLabels = {}; |
fbe31dc8 | 49 | |
70be5ed1 | 50 | this.area = layout.getPlotArea(); |
423f5ed3 DV |
51 | this.container.style.position = "relative"; |
52 | this.container.style.width = this.width + "px"; | |
53 | ||
54 | // Set up a clipping area for the canvas (and the interaction canvas). | |
55 | // This ensures that we don't overdraw. | |
920208fb PF |
56 | if (this.dygraph_.isUsingExcanvas_) { |
57 | this._createIEClipArea(); | |
58 | } else { | |
59 | var ctx = this.dygraph_.canvas_ctx_; | |
60 | ctx.beginPath(); | |
61 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
62 | ctx.clip(); | |
63 | ||
64 | ctx = this.dygraph_.hidden_ctx_; | |
65 | ctx.beginPath(); | |
66 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
67 | ctx.clip(); | |
68 | } | |
423f5ed3 DV |
69 | }; |
70 | ||
71 | DygraphCanvasRenderer.prototype.attr_ = function(x) { | |
72 | return this.dygraph_.attr_(x); | |
73 | }; | |
74 | ||
fbe31dc8 DV |
75 | DygraphCanvasRenderer.prototype.clear = function() { |
76 | if (this.isIE) { | |
77 | // VML takes a while to start up, so we just poll every this.IEDelay | |
78 | try { | |
79 | if (this.clearDelay) { | |
80 | this.clearDelay.cancel(); | |
81 | this.clearDelay = null; | |
82 | } | |
2cf95fff | 83 | var context = this.elementContext; |
fbe31dc8 DV |
84 | } |
85 | catch (e) { | |
76171648 | 86 | // TODO(danvk): this is broken, since MochiKit.Async is gone. |
fbe31dc8 DV |
87 | this.clearDelay = MochiKit.Async.wait(this.IEDelay); |
88 | this.clearDelay.addCallback(bind(this.clear, this)); | |
89 | return; | |
90 | } | |
91 | } | |
92 | ||
2cf95fff | 93 | var context = this.elementContext; |
fbe31dc8 DV |
94 | context.clearRect(0, 0, this.width, this.height); |
95 | ||
2160ed4a | 96 | for (var i = 0; i < this.xlabels.length; i++) { |
b0c3b730 | 97 | var el = this.xlabels[i]; |
b304aaec | 98 | if (el.parentNode) el.parentNode.removeChild(el); |
2160ed4a DV |
99 | } |
100 | for (var i = 0; i < this.ylabels.length; i++) { | |
b0c3b730 | 101 | var el = this.ylabels[i]; |
b304aaec | 102 | if (el.parentNode) el.parentNode.removeChild(el); |
2160ed4a | 103 | } |
ce49c2fa DV |
104 | for (var i = 0; i < this.annotations.length; i++) { |
105 | var el = this.annotations[i]; | |
b304aaec | 106 | if (el.parentNode) el.parentNode.removeChild(el); |
ce49c2fa | 107 | } |
ad1798c2 DV |
108 | for (var k in this.chartLabels) { |
109 | if (!this.chartLabels.hasOwnProperty(k)) continue; | |
110 | var el = this.chartLabels[k]; | |
111 | if (el.parentNode) el.parentNode.removeChild(el); | |
112 | } | |
fbe31dc8 DV |
113 | this.xlabels = new Array(); |
114 | this.ylabels = new Array(); | |
ce49c2fa | 115 | this.annotations = new Array(); |
ad1798c2 | 116 | this.chartLabels = {}; |
fbe31dc8 DV |
117 | }; |
118 | ||
119 | ||
120 | DygraphCanvasRenderer.isSupported = function(canvasName) { | |
121 | var canvas = null; | |
122 | try { | |
21d3323f | 123 | if (typeof(canvasName) == 'undefined' || canvasName == null) |
b0c3b730 | 124 | canvas = document.createElement("canvas"); |
fbe31dc8 | 125 | else |
b0c3b730 | 126 | canvas = canvasName; |
fbe31dc8 DV |
127 | var context = canvas.getContext("2d"); |
128 | } | |
129 | catch (e) { | |
130 | var ie = navigator.appVersion.match(/MSIE (\d\.\d)/); | |
131 | var opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1); | |
132 | if ((!ie) || (ie[1] < 6) || (opera)) | |
133 | return false; | |
134 | return true; | |
135 | } | |
136 | return true; | |
6a1aa64f | 137 | }; |
6a1aa64f DV |
138 | |
139 | /** | |
600d841a DV |
140 | * @param { [String] } colors Array of color strings. Should have one entry for |
141 | * each series to be rendered. | |
142 | */ | |
143 | DygraphCanvasRenderer.prototype.setColors = function(colors) { | |
144 | this.colorScheme_ = colors; | |
145 | }; | |
146 | ||
147 | /** | |
6a1aa64f DV |
148 | * Draw an X/Y grid on top of the existing plot |
149 | */ | |
285a6bda | 150 | DygraphCanvasRenderer.prototype.render = function() { |
528ce7e5 DV |
151 | // Draw the new X/Y grid. Lines appear crisper when pixels are rounded to |
152 | // half-integers. This prevents them from drawing in two rows/cols. | |
2cf95fff | 153 | var ctx = this.elementContext; |
528ce7e5 DV |
154 | function halfUp(x){return Math.round(x)+0.5}; |
155 | function halfDown(y){return Math.round(y)-0.5}; | |
e7746234 | 156 | |
423f5ed3 | 157 | if (this.attr_('underlayCallback')) { |
1e41bd2d DV |
158 | // NOTE: we pass the dygraph object to this callback twice to avoid breaking |
159 | // users who expect a deprecated form of this callback. | |
423f5ed3 | 160 | this.attr_('underlayCallback')(ctx, this.area, this.dygraph_, this.dygraph_); |
e7746234 EC |
161 | } |
162 | ||
423f5ed3 | 163 | if (this.attr_('drawYGrid')) { |
6a1aa64f | 164 | var ticks = this.layout.yticks; |
bbba718a | 165 | // TODO(konigsberg): I don't think these calls to save() have a corresponding restore(). |
6a1aa64f | 166 | ctx.save(); |
423f5ed3 | 167 | ctx.strokeStyle = this.attr_('gridLineColor'); |
990d6a35 | 168 | ctx.lineWidth = this.attr_('gridLineWidth'); |
6a1aa64f | 169 | for (var i = 0; i < ticks.length; i++) { |
880a574f DV |
170 | // TODO(danvk): allow secondary axes to draw a grid, too. |
171 | if (ticks[i][0] != 0) continue; | |
528ce7e5 DV |
172 | var x = halfUp(this.area.x); |
173 | var y = halfDown(this.area.y + ticks[i][1] * this.area.h); | |
6a1aa64f DV |
174 | ctx.beginPath(); |
175 | ctx.moveTo(x, y); | |
176 | ctx.lineTo(x + this.area.w, y); | |
177 | ctx.closePath(); | |
178 | ctx.stroke(); | |
179 | } | |
180 | } | |
181 | ||
423f5ed3 | 182 | if (this.attr_('drawXGrid')) { |
6a1aa64f DV |
183 | var ticks = this.layout.xticks; |
184 | ctx.save(); | |
423f5ed3 | 185 | ctx.strokeStyle = this.attr_('gridLineColor'); |
990d6a35 | 186 | ctx.lineWidth = this.attr_('gridLineWidth'); |
6a1aa64f | 187 | for (var i=0; i<ticks.length; i++) { |
528ce7e5 DV |
188 | var x = halfUp(this.area.x + ticks[i][0] * this.area.w); |
189 | var y = halfDown(this.area.y + this.area.h); | |
6a1aa64f | 190 | ctx.beginPath(); |
880a574f | 191 | ctx.moveTo(x, y); |
6a1aa64f DV |
192 | ctx.lineTo(x, this.area.y); |
193 | ctx.closePath(); | |
194 | ctx.stroke(); | |
195 | } | |
196 | } | |
2ce09b19 DV |
197 | |
198 | // Do the ordinary rendering, as before | |
2ce09b19 | 199 | this._renderLineChart(); |
fbe31dc8 | 200 | this._renderAxis(); |
ccd9d7c2 | 201 | this._renderChartLabels(); |
ce49c2fa | 202 | this._renderAnnotations(); |
fbe31dc8 DV |
203 | }; |
204 | ||
920208fb PF |
205 | DygraphCanvasRenderer.prototype._createIEClipArea = function() { |
206 | var className = 'dygraph-clip-div'; | |
207 | var graphDiv = this.dygraph_.graphDiv; | |
208 | ||
209 | // Remove old clip divs. | |
210 | for (var i = graphDiv.childNodes.length-1; i >= 0; i--) { | |
211 | if (graphDiv.childNodes[i].className == className) { | |
212 | graphDiv.removeChild(graphDiv.childNodes[i]); | |
213 | } | |
214 | } | |
215 | ||
216 | // Determine background color to give clip divs. | |
217 | var backgroundColor = document.bgColor; | |
218 | var element = this.dygraph_.graphDiv; | |
219 | while (element != document) { | |
220 | var bgcolor = element.currentStyle.backgroundColor; | |
221 | if (bgcolor && bgcolor != 'transparent') { | |
222 | backgroundColor = bgcolor; | |
223 | break; | |
224 | } | |
225 | element = element.parentNode; | |
226 | } | |
227 | ||
228 | function createClipDiv(area) { | |
229 | if (area.w == 0 || area.h == 0) { | |
230 | return; | |
231 | } | |
232 | var elem = document.createElement('div'); | |
233 | elem.className = className; | |
234 | elem.style.backgroundColor = backgroundColor; | |
235 | elem.style.position = 'absolute'; | |
236 | elem.style.left = area.x + 'px'; | |
237 | elem.style.top = area.y + 'px'; | |
238 | elem.style.width = area.w + 'px'; | |
239 | elem.style.height = area.h + 'px'; | |
240 | graphDiv.appendChild(elem); | |
241 | } | |
242 | ||
243 | var plotArea = this.area; | |
244 | // Left side | |
245 | createClipDiv({x:0, y:0, w:plotArea.x, h:this.height}); | |
246 | // Top | |
247 | createClipDiv({x:plotArea.x, y:0, w:this.width-plotArea.x, h:plotArea.y}); | |
248 | // Right side | |
249 | createClipDiv({x:plotArea.x+plotArea.w, y:0, w:this.width-plotArea.x-plotArea.w, h:this.height}); | |
250 | // Bottom | |
251 | createClipDiv({x:plotArea.x, y:plotArea.y+plotArea.h, w:this.width-plotArea.x, h:this.height-plotArea.h-plotArea.y}); | |
252 | } | |
fbe31dc8 DV |
253 | |
254 | DygraphCanvasRenderer.prototype._renderAxis = function() { | |
423f5ed3 | 255 | if (!this.attr_('drawXAxis') && !this.attr_('drawYAxis')) return; |
fbe31dc8 | 256 | |
528ce7e5 DV |
257 | // Round pixels to half-integer boundaries for crisper drawing. |
258 | function halfUp(x){return Math.round(x)+0.5}; | |
259 | function halfDown(y){return Math.round(y)-0.5}; | |
260 | ||
2cf95fff | 261 | var context = this.elementContext; |
fbe31dc8 | 262 | |
34fedff8 | 263 | var labelStyle = { |
423f5ed3 DV |
264 | position: "absolute", |
265 | fontSize: this.attr_('axisLabelFontSize') + "px", | |
266 | zIndex: 10, | |
267 | color: this.attr_('axisLabelColor'), | |
268 | width: this.attr_('axisLabelWidth') + "px", | |
74a5af31 | 269 | // height: this.attr_('axisLabelFontSize') + 2 + "px", |
ccd9d7c2 | 270 | lineHeight: "normal", // Something other than "normal" line-height screws up label positioning. |
423f5ed3 | 271 | overflow: "hidden" |
34fedff8 | 272 | }; |
48e614ac | 273 | var makeDiv = function(txt, axis, prec_axis) { |
34fedff8 DV |
274 | var div = document.createElement("div"); |
275 | for (var name in labelStyle) { | |
85b99f0b DV |
276 | if (labelStyle.hasOwnProperty(name)) { |
277 | div.style[name] = labelStyle[name]; | |
278 | } | |
fbe31dc8 | 279 | } |
ba451526 | 280 | var inner_div = document.createElement("div"); |
48e614ac DV |
281 | inner_div.className = 'dygraph-axis-label' + |
282 | ' dygraph-axis-label-' + axis + | |
283 | (prec_axis ? ' dygraph-axis-label-' + prec_axis : ''); | |
ba451526 DV |
284 | inner_div.appendChild(document.createTextNode(txt)); |
285 | div.appendChild(inner_div); | |
34fedff8 | 286 | return div; |
fbe31dc8 DV |
287 | }; |
288 | ||
289 | // axis lines | |
290 | context.save(); | |
423f5ed3 DV |
291 | context.strokeStyle = this.attr_('axisLineColor'); |
292 | context.lineWidth = this.attr_('axisLineWidth'); | |
fbe31dc8 | 293 | |
423f5ed3 | 294 | if (this.attr_('drawYAxis')) { |
8b7a0cc3 | 295 | if (this.layout.yticks && this.layout.yticks.length > 0) { |
48e614ac | 296 | var num_axes = this.dygraph_.numAxes(); |
2160ed4a DV |
297 | for (var i = 0; i < this.layout.yticks.length; i++) { |
298 | var tick = this.layout.yticks[i]; | |
fbe31dc8 DV |
299 | if (typeof(tick) == "function") return; |
300 | var x = this.area.x; | |
880a574f | 301 | var sgn = 1; |
48e614ac | 302 | var prec_axis = 'y1'; |
880a574f DV |
303 | if (tick[0] == 1) { // right-side y-axis |
304 | x = this.area.x + this.area.w; | |
305 | sgn = -1; | |
48e614ac | 306 | prec_axis = 'y2'; |
9012dd21 DV |
307 | } |
308 | var y = this.area.y + tick[1] * this.area.h; | |
920208fb PF |
309 | |
310 | /* Tick marks are currently clipped, so don't bother drawing them. | |
fbe31dc8 | 311 | context.beginPath(); |
528ce7e5 | 312 | context.moveTo(halfUp(x), halfDown(y)); |
0e23cfc6 | 313 | context.lineTo(halfUp(x - sgn * this.attr_('axisTickSize')), halfDown(y)); |
fbe31dc8 DV |
314 | context.closePath(); |
315 | context.stroke(); | |
920208fb | 316 | */ |
fbe31dc8 | 317 | |
48e614ac | 318 | var label = makeDiv(tick[2], 'y', num_axes == 2 ? prec_axis : null); |
423f5ed3 | 319 | var top = (y - this.attr_('axisLabelFontSize') / 2); |
fbe31dc8 DV |
320 | if (top < 0) top = 0; |
321 | ||
423f5ed3 | 322 | if (top + this.attr_('axisLabelFontSize') + 3 > this.height) { |
fbe31dc8 DV |
323 | label.style.bottom = "0px"; |
324 | } else { | |
325 | label.style.top = top + "px"; | |
326 | } | |
9012dd21 | 327 | if (tick[0] == 0) { |
423f5ed3 | 328 | label.style.left = (this.area.x - this.attr_('yAxisLabelWidth') - this.attr_('axisTickSize')) + "px"; |
9012dd21 DV |
329 | label.style.textAlign = "right"; |
330 | } else if (tick[0] == 1) { | |
331 | label.style.left = (this.area.x + this.area.w + | |
423f5ed3 | 332 | this.attr_('axisTickSize')) + "px"; |
9012dd21 DV |
333 | label.style.textAlign = "left"; |
334 | } | |
423f5ed3 | 335 | label.style.width = this.attr_('yAxisLabelWidth') + "px"; |
b0c3b730 | 336 | this.container.appendChild(label); |
fbe31dc8 | 337 | this.ylabels.push(label); |
2160ed4a | 338 | } |
fbe31dc8 DV |
339 | |
340 | // The lowest tick on the y-axis often overlaps with the leftmost | |
341 | // tick on the x-axis. Shift the bottom tick up a little bit to | |
342 | // compensate if necessary. | |
343 | var bottomTick = this.ylabels[0]; | |
423f5ed3 | 344 | var fontSize = this.attr_('axisLabelFontSize'); |
fbe31dc8 DV |
345 | var bottom = parseInt(bottomTick.style.top) + fontSize; |
346 | if (bottom > this.height - fontSize) { | |
347 | bottomTick.style.top = (parseInt(bottomTick.style.top) - | |
348 | fontSize / 2) + "px"; | |
349 | } | |
350 | } | |
351 | ||
528ce7e5 | 352 | // draw a vertical line on the left to separate the chart from the labels. |
fbe31dc8 | 353 | context.beginPath(); |
528ce7e5 DV |
354 | context.moveTo(halfUp(this.area.x), halfDown(this.area.y)); |
355 | context.lineTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h)); | |
fbe31dc8 DV |
356 | context.closePath(); |
357 | context.stroke(); | |
c1dbeb10 | 358 | |
528ce7e5 | 359 | // if there's a secondary y-axis, draw a vertical line for that, too. |
c1dbeb10 DV |
360 | if (this.dygraph_.numAxes() == 2) { |
361 | context.beginPath(); | |
528ce7e5 DV |
362 | context.moveTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y)); |
363 | context.lineTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); | |
c1dbeb10 DV |
364 | context.closePath(); |
365 | context.stroke(); | |
366 | } | |
fbe31dc8 DV |
367 | } |
368 | ||
423f5ed3 | 369 | if (this.attr_('drawXAxis')) { |
fbe31dc8 | 370 | if (this.layout.xticks) { |
2160ed4a DV |
371 | for (var i = 0; i < this.layout.xticks.length; i++) { |
372 | var tick = this.layout.xticks[i]; | |
fbe31dc8 DV |
373 | if (typeof(dataset) == "function") return; |
374 | ||
375 | var x = this.area.x + tick[0] * this.area.w; | |
376 | var y = this.area.y + this.area.h; | |
920208fb PF |
377 | |
378 | /* Tick marks are currently clipped, so don't bother drawing them. | |
fbe31dc8 | 379 | context.beginPath(); |
528ce7e5 | 380 | context.moveTo(halfUp(x), halfDown(y)); |
423f5ed3 | 381 | context.lineTo(halfUp(x), halfDown(y + this.attr_('axisTickSize'))); |
fbe31dc8 DV |
382 | context.closePath(); |
383 | context.stroke(); | |
920208fb | 384 | */ |
fbe31dc8 | 385 | |
ba451526 | 386 | var label = makeDiv(tick[1], 'x'); |
fbe31dc8 | 387 | label.style.textAlign = "center"; |
423f5ed3 | 388 | label.style.top = (y + this.attr_('axisTickSize')) + 'px'; |
fbe31dc8 | 389 | |
423f5ed3 DV |
390 | var left = (x - this.attr_('axisLabelWidth')/2); |
391 | if (left + this.attr_('axisLabelWidth') > this.width) { | |
392 | left = this.width - this.attr_('xAxisLabelWidth'); | |
fbe31dc8 DV |
393 | label.style.textAlign = "right"; |
394 | } | |
395 | if (left < 0) { | |
396 | left = 0; | |
397 | label.style.textAlign = "left"; | |
398 | } | |
399 | ||
400 | label.style.left = left + "px"; | |
423f5ed3 | 401 | label.style.width = this.attr_('xAxisLabelWidth') + "px"; |
b0c3b730 | 402 | this.container.appendChild(label); |
fbe31dc8 | 403 | this.xlabels.push(label); |
2160ed4a | 404 | } |
fbe31dc8 DV |
405 | } |
406 | ||
407 | context.beginPath(); | |
528ce7e5 DV |
408 | context.moveTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h)); |
409 | context.lineTo(halfUp(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); | |
fbe31dc8 DV |
410 | context.closePath(); |
411 | context.stroke(); | |
412 | } | |
413 | ||
414 | context.restore(); | |
6a1aa64f DV |
415 | }; |
416 | ||
fbe31dc8 | 417 | |
ad1798c2 DV |
418 | DygraphCanvasRenderer.prototype._renderChartLabels = function() { |
419 | // Generate divs for the chart title, xlabel and ylabel. | |
420 | // Space for these divs has already been taken away from the charting area in | |
421 | // the DygraphCanvasRenderer constructor. | |
422 | if (this.attr_('title')) { | |
423 | var div = document.createElement("div"); | |
424 | div.style.position = 'absolute'; | |
425 | div.style.top = '0px'; | |
426 | div.style.left = this.area.x + 'px'; | |
427 | div.style.width = this.area.w + 'px'; | |
428 | div.style.height = this.attr_('titleHeight') + 'px'; | |
429 | div.style.textAlign = 'center'; | |
b4202b3d | 430 | div.style.fontSize = (this.attr_('titleHeight') - 8) + 'px'; |
ad1798c2 | 431 | div.style.fontWeight = 'bold'; |
ca49434a DV |
432 | var class_div = document.createElement("div"); |
433 | class_div.className = 'dygraph-label dygraph-title'; | |
434 | class_div.innerHTML = this.attr_('title'); | |
435 | div.appendChild(class_div); | |
ad1798c2 DV |
436 | this.container.appendChild(div); |
437 | this.chartLabels.title = div; | |
438 | } | |
439 | ||
440 | if (this.attr_('xlabel')) { | |
441 | var div = document.createElement("div"); | |
442 | div.style.position = 'absolute'; | |
443 | div.style.bottom = 0; // TODO(danvk): this is lazy. Calculate style.top. | |
444 | div.style.left = this.area.x + 'px'; | |
445 | div.style.width = this.area.w + 'px'; | |
446 | div.style.height = this.attr_('xLabelHeight') + 'px'; | |
447 | div.style.textAlign = 'center'; | |
86cce9e8 | 448 | div.style.fontSize = (this.attr_('xLabelHeight') - 2) + 'px'; |
ca49434a DV |
449 | |
450 | var class_div = document.createElement("div"); | |
451 | class_div.className = 'dygraph-label dygraph-xlabel'; | |
452 | class_div.innerHTML = this.attr_('xlabel'); | |
453 | div.appendChild(class_div); | |
ad1798c2 DV |
454 | this.container.appendChild(div); |
455 | this.chartLabels.xlabel = div; | |
456 | } | |
457 | ||
458 | if (this.attr_('ylabel')) { | |
459 | var box = { | |
460 | left: 0, | |
461 | top: this.area.y, | |
462 | width: this.attr_('yLabelWidth'), | |
463 | height: this.area.h | |
464 | }; | |
ca49434a | 465 | // TODO(danvk): is this outer div actually necessary? |
ad1798c2 DV |
466 | var div = document.createElement("div"); |
467 | div.style.position = 'absolute'; | |
468 | div.style.left = box.left; | |
469 | div.style.top = box.top + 'px'; | |
470 | div.style.width = box.width + 'px'; | |
471 | div.style.height = box.height + 'px'; | |
86cce9e8 | 472 | div.style.fontSize = (this.attr_('yLabelWidth') - 2) + 'px'; |
ad1798c2 DV |
473 | |
474 | var inner_div = document.createElement("div"); | |
475 | inner_div.style.position = 'absolute'; | |
ad1798c2 DV |
476 | inner_div.style.width = box.height + 'px'; |
477 | inner_div.style.height = box.width + 'px'; | |
478 | inner_div.style.top = (box.height / 2 - box.width / 2) + 'px'; | |
479 | inner_div.style.left = (box.width / 2 - box.height / 2) + 'px'; | |
480 | inner_div.style.textAlign = 'center'; | |
b56b6993 DV |
481 | |
482 | // CSS rotation is an HTML5 feature which is not standardized. Hence every | |
483 | // browser has its own name for the CSS style. | |
ad1798c2 DV |
484 | inner_div.style.transform = 'rotate(-90deg)'; // HTML5 |
485 | inner_div.style.WebkitTransform = 'rotate(-90deg)'; // Safari/Chrome | |
486 | inner_div.style.MozTransform = 'rotate(-90deg)'; // Firefox | |
487 | inner_div.style.OTransform = 'rotate(-90deg)'; // Opera | |
52c47e80 | 488 | inner_div.style.msTransform = 'rotate(-90deg)'; // IE9 |
b56b6993 DV |
489 | |
490 | if (typeof(document.documentMode) !== 'undefined' && | |
491 | document.documentMode < 9) { | |
492 | // We're dealing w/ an old version of IE, so we have to rotate the text | |
493 | // using a BasicImage transform. This uses a different origin of rotation | |
494 | // than HTML5 rotation (top left of div vs. its center). | |
495 | inner_div.style.filter = | |
496 | 'progid:DXImageTransform.Microsoft.BasicImage(rotation=3)'; | |
497 | inner_div.style.left = '0px'; | |
498 | inner_div.style.top = '0px'; | |
499 | } | |
ad1798c2 | 500 | |
ca49434a DV |
501 | var class_div = document.createElement("div"); |
502 | class_div.className = 'dygraph-label dygraph-ylabel'; | |
503 | class_div.innerHTML = this.attr_('ylabel'); | |
504 | ||
505 | inner_div.appendChild(class_div); | |
ad1798c2 DV |
506 | div.appendChild(inner_div); |
507 | this.container.appendChild(div); | |
508 | this.chartLabels.ylabel = div; | |
509 | } | |
510 | }; | |
511 | ||
512 | ||
ce49c2fa DV |
513 | DygraphCanvasRenderer.prototype._renderAnnotations = function() { |
514 | var annotationStyle = { | |
515 | "position": "absolute", | |
423f5ed3 | 516 | "fontSize": this.attr_('axisLabelFontSize') + "px", |
ce49c2fa | 517 | "zIndex": 10, |
3bf2fa91 | 518 | "overflow": "hidden" |
ce49c2fa DV |
519 | }; |
520 | ||
ab5e5c75 DV |
521 | var bindEvt = function(eventName, classEventName, p, self) { |
522 | return function(e) { | |
523 | var a = p.annotation; | |
524 | if (a.hasOwnProperty(eventName)) { | |
525 | a[eventName](a, p, self.dygraph_, e); | |
526 | } else if (self.dygraph_.attr_(classEventName)) { | |
527 | self.dygraph_.attr_(classEventName)(a, p, self.dygraph_,e ); | |
528 | } | |
529 | }; | |
530 | } | |
531 | ||
ce49c2fa DV |
532 | // Get a list of point with annotations. |
533 | var points = this.layout.annotated_points; | |
534 | for (var i = 0; i < points.length; i++) { | |
535 | var p = points[i]; | |
e6d53148 DV |
536 | if (p.canvasx < this.area.x || p.canvasx > this.area.x + this.area.w) { |
537 | continue; | |
538 | } | |
539 | ||
ce5e8d36 DV |
540 | var a = p.annotation; |
541 | var tick_height = 6; | |
542 | if (a.hasOwnProperty("tickHeight")) { | |
543 | tick_height = a.tickHeight; | |
9a40897e DV |
544 | } |
545 | ||
ce49c2fa DV |
546 | var div = document.createElement("div"); |
547 | for (var name in annotationStyle) { | |
548 | if (annotationStyle.hasOwnProperty(name)) { | |
549 | div.style[name] = annotationStyle[name]; | |
550 | } | |
551 | } | |
ce5e8d36 DV |
552 | if (!a.hasOwnProperty('icon')) { |
553 | div.className = "dygraphDefaultAnnotation"; | |
554 | } | |
555 | if (a.hasOwnProperty('cssClass')) { | |
556 | div.className += " " + a.cssClass; | |
557 | } | |
558 | ||
a5ad69cc DV |
559 | var width = a.hasOwnProperty('width') ? a.width : 16; |
560 | var height = a.hasOwnProperty('height') ? a.height : 16; | |
ce5e8d36 DV |
561 | if (a.hasOwnProperty('icon')) { |
562 | var img = document.createElement("img"); | |
563 | img.src = a.icon; | |
33030f33 DV |
564 | img.width = width; |
565 | img.height = height; | |
ce5e8d36 DV |
566 | div.appendChild(img); |
567 | } else if (p.annotation.hasOwnProperty('shortText')) { | |
568 | div.appendChild(document.createTextNode(p.annotation.shortText)); | |
5c528fa2 | 569 | } |
ce5e8d36 | 570 | div.style.left = (p.canvasx - width / 2) + "px"; |
d14b9eed DV |
571 | if (a.attachAtBottom) { |
572 | div.style.top = (this.area.h - height - tick_height) + "px"; | |
573 | } else { | |
574 | div.style.top = (p.canvasy - height - tick_height) + "px"; | |
575 | } | |
ce5e8d36 DV |
576 | div.style.width = width + "px"; |
577 | div.style.height = height + "px"; | |
ce49c2fa DV |
578 | div.title = p.annotation.text; |
579 | div.style.color = this.colors[p.name]; | |
580 | div.style.borderColor = this.colors[p.name]; | |
e6d53148 | 581 | a.div = div; |
ab5e5c75 | 582 | |
9a40897e DV |
583 | Dygraph.addEvent(div, 'click', |
584 | bindEvt('clickHandler', 'annotationClickHandler', p, this)); | |
585 | Dygraph.addEvent(div, 'mouseover', | |
586 | bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p, this)); | |
587 | Dygraph.addEvent(div, 'mouseout', | |
588 | bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p, this)); | |
589 | Dygraph.addEvent(div, 'dblclick', | |
590 | bindEvt('dblClickHandler', 'annotationDblClickHandler', p, this)); | |
ab5e5c75 | 591 | |
ce49c2fa DV |
592 | this.container.appendChild(div); |
593 | this.annotations.push(div); | |
9a40897e | 594 | |
2cf95fff | 595 | var ctx = this.elementContext; |
9a40897e DV |
596 | ctx.strokeStyle = this.colors[p.name]; |
597 | ctx.beginPath(); | |
d14b9eed DV |
598 | if (!a.attachAtBottom) { |
599 | ctx.moveTo(p.canvasx, p.canvasy); | |
600 | ctx.lineTo(p.canvasx, p.canvasy - 2 - tick_height); | |
601 | } else { | |
602 | ctx.moveTo(p.canvasx, this.area.h); | |
603 | ctx.lineTo(p.canvasx, this.area.h - 2 - tick_height); | |
604 | } | |
9a40897e DV |
605 | ctx.closePath(); |
606 | ctx.stroke(); | |
ce49c2fa DV |
607 | } |
608 | }; | |
609 | ||
610 | ||
6a1aa64f DV |
611 | /** |
612 | * Overrides the CanvasRenderer method to draw error bars | |
613 | */ | |
285a6bda | 614 | DygraphCanvasRenderer.prototype._renderLineChart = function() { |
f9414b11 DV |
615 | var isNullOrNaN = function(x) { |
616 | return (x === null || isNaN(x)); | |
617 | }; | |
ccd9d7c2 | 618 | |
44c6bc29 | 619 | // TODO(danvk): use this.attr_ for many of these. |
2cf95fff | 620 | var context = this.elementContext; |
423f5ed3 | 621 | var fillAlpha = this.attr_('fillAlpha'); |
e4182459 | 622 | var errorBars = this.attr_("errorBars") || this.attr_("customBars"); |
44c6bc29 | 623 | var fillGraph = this.attr_("fillGraph"); |
b2c9222a DV |
624 | var stackedGraph = this.attr_("stackedGraph"); |
625 | var stepPlot = this.attr_("stepPlot"); | |
c3e1495b AR |
626 | var points = this.layout.points; |
627 | var pointsLength = points.length; | |
21d3323f DV |
628 | |
629 | var setNames = []; | |
ca43052c | 630 | for (var name in this.layout.datasets) { |
85b99f0b DV |
631 | if (this.layout.datasets.hasOwnProperty(name)) { |
632 | setNames.push(name); | |
633 | } | |
ca43052c | 634 | } |
21d3323f | 635 | var setCount = setNames.length; |
6a1aa64f | 636 | |
0e23cfc6 | 637 | // TODO(danvk): Move this mapping into Dygraph and get it out of here. |
f032c51d AV |
638 | this.colors = {} |
639 | for (var i = 0; i < setCount; i++) { | |
600d841a | 640 | this.colors[setNames[i]] = this.colorScheme_[i % this.colorScheme_.length]; |
f032c51d AV |
641 | } |
642 | ||
ff00d3e2 DV |
643 | // Update Points |
644 | // TODO(danvk): here | |
c3e1495b AR |
645 | for (var i = pointsLength; i--;) { |
646 | var point = points[i]; | |
6a1aa64f DV |
647 | point.canvasx = this.area.w * point.x + this.area.x; |
648 | point.canvasy = this.area.h * point.y + this.area.y; | |
649 | } | |
6a1aa64f DV |
650 | |
651 | // create paths | |
80aaae18 DV |
652 | var ctx = context; |
653 | if (errorBars) { | |
6a834bbb DV |
654 | if (fillGraph) { |
655 | this.dygraph_.warn("Can't use fillGraph option with error bars"); | |
656 | } | |
657 | ||
6a1aa64f DV |
658 | for (var i = 0; i < setCount; i++) { |
659 | var setName = setNames[i]; | |
b2c9222a | 660 | var axis = this.dygraph_.axisPropertiesForSeries(setName); |
f032c51d | 661 | var color = this.colors[setName]; |
6a1aa64f DV |
662 | |
663 | // setup graphics context | |
80aaae18 | 664 | ctx.save(); |
56623f3b | 665 | var prevX = NaN; |
afdc483f | 666 | var prevY = NaN; |
6a1aa64f | 667 | var prevYs = [-1, -1]; |
ea4942ed | 668 | var yscale = axis.yscale; |
f474c2a3 DV |
669 | // should be same color as the lines but only 15% opaque. |
670 | var rgb = new RGBColor(color); | |
43af96e7 NK |
671 | var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + |
672 | fillAlpha + ')'; | |
f474c2a3 | 673 | ctx.fillStyle = err_color; |
05c9d0c4 | 674 | ctx.beginPath(); |
c3e1495b AR |
675 | for (var j = 0; j < pointsLength; j++) { |
676 | var point = points[j]; | |
6a1aa64f | 677 | if (point.name == setName) { |
e9fe4a2f | 678 | if (!Dygraph.isOK(point.y)) { |
56623f3b | 679 | prevX = NaN; |
ae85914a | 680 | continue; |
5011e7a1 | 681 | } |
ce49c2fa | 682 | |
3637724f | 683 | // TODO(danvk): here |
afdc483f | 684 | if (stepPlot) { |
7f028980 | 685 | var newYs = [ point.y_bottom, point.y_top ]; |
afdc483f NN |
686 | prevY = point.y; |
687 | } else { | |
7f028980 | 688 | var newYs = [ point.y_bottom, point.y_top ]; |
afdc483f | 689 | } |
6a1aa64f DV |
690 | newYs[0] = this.area.h * newYs[0] + this.area.y; |
691 | newYs[1] = this.area.h * newYs[1] + this.area.y; | |
56623f3b | 692 | if (!isNaN(prevX)) { |
afdc483f | 693 | if (stepPlot) { |
47600757 | 694 | ctx.moveTo(prevX, newYs[0]); |
afdc483f | 695 | } else { |
47600757 | 696 | ctx.moveTo(prevX, prevYs[0]); |
afdc483f | 697 | } |
5954ef32 DV |
698 | ctx.lineTo(point.canvasx, newYs[0]); |
699 | ctx.lineTo(point.canvasx, newYs[1]); | |
afdc483f | 700 | if (stepPlot) { |
47600757 | 701 | ctx.lineTo(prevX, newYs[1]); |
afdc483f | 702 | } else { |
47600757 | 703 | ctx.lineTo(prevX, prevYs[1]); |
afdc483f | 704 | } |
5954ef32 DV |
705 | ctx.closePath(); |
706 | } | |
354e15ab | 707 | prevYs = newYs; |
5954ef32 DV |
708 | prevX = point.canvasx; |
709 | } | |
710 | } | |
711 | ctx.fill(); | |
712 | } | |
713 | } else if (fillGraph) { | |
354e15ab DE |
714 | var baseline = [] // for stacked graphs: baseline for filling |
715 | ||
716 | // process sets in reverse order (needed for stacked graphs) | |
717 | for (var i = setCount - 1; i >= 0; i--) { | |
5954ef32 | 718 | var setName = setNames[i]; |
f032c51d | 719 | var color = this.colors[setName]; |
b2c9222a | 720 | var axis = this.dygraph_.axisPropertiesForSeries(setName); |
ea4942ed DV |
721 | var axisY = 1.0 + axis.minyval * axis.yscale; |
722 | if (axisY < 0.0) axisY = 0.0; | |
723 | else if (axisY > 1.0) axisY = 1.0; | |
724 | axisY = this.area.h * axisY + this.area.y; | |
5954ef32 DV |
725 | |
726 | // setup graphics context | |
727 | ctx.save(); | |
56623f3b | 728 | var prevX = NaN; |
5954ef32 | 729 | var prevYs = [-1, -1]; |
ea4942ed | 730 | var yscale = axis.yscale; |
5954ef32 DV |
731 | // should be same color as the lines but only 15% opaque. |
732 | var rgb = new RGBColor(color); | |
43af96e7 NK |
733 | var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + |
734 | fillAlpha + ')'; | |
5954ef32 DV |
735 | ctx.fillStyle = err_color; |
736 | ctx.beginPath(); | |
c3e1495b AR |
737 | for (var j = 0; j < pointsLength; j++) { |
738 | var point = points[j]; | |
5954ef32 | 739 | if (point.name == setName) { |
e9fe4a2f | 740 | if (!Dygraph.isOK(point.y)) { |
56623f3b | 741 | prevX = NaN; |
5954ef32 DV |
742 | continue; |
743 | } | |
354e15ab DE |
744 | var newYs; |
745 | if (stackedGraph) { | |
47927039 | 746 | var lastY = baseline[point.canvasx]; |
354e15ab DE |
747 | if (lastY === undefined) lastY = axisY; |
748 | baseline[point.canvasx] = point.canvasy; | |
749 | newYs = [ point.canvasy, lastY ]; | |
750 | } else { | |
751 | newYs = [ point.canvasy, axisY ]; | |
752 | } | |
56623f3b | 753 | if (!isNaN(prevX)) { |
05c9d0c4 | 754 | ctx.moveTo(prevX, prevYs[0]); |
afdc483f | 755 | if (stepPlot) { |
47600757 | 756 | ctx.lineTo(point.canvasx, prevYs[0]); |
afdc483f | 757 | } else { |
47600757 | 758 | ctx.lineTo(point.canvasx, newYs[0]); |
afdc483f | 759 | } |
05c9d0c4 DV |
760 | ctx.lineTo(point.canvasx, newYs[1]); |
761 | ctx.lineTo(prevX, prevYs[1]); | |
762 | ctx.closePath(); | |
6a1aa64f | 763 | } |
354e15ab | 764 | prevYs = newYs; |
6a1aa64f DV |
765 | prevX = point.canvasx; |
766 | } | |
05c9d0c4 | 767 | } |
6a1aa64f DV |
768 | ctx.fill(); |
769 | } | |
80aaae18 DV |
770 | } |
771 | ||
f9414b11 | 772 | // Drawing the lines. |
c3e1495b AR |
773 | var firstIndexInSet = 0; |
774 | var afterLastIndexInSet = 0; | |
775 | var setLength = 0; | |
776 | for (var i = 0; i < setCount; i += 1) { | |
777 | setLength = this.layout.setPointsLengths[i]; | |
778 | afterLastIndexInSet += setLength; | |
80aaae18 | 779 | var setName = setNames[i]; |
f032c51d | 780 | var color = this.colors[setName]; |
227b93cc | 781 | var strokeWidth = this.dygraph_.attr_("strokeWidth", setName); |
80aaae18 DV |
782 | |
783 | // setup graphics context | |
784 | context.save(); | |
227b93cc | 785 | var pointSize = this.dygraph_.attr_("pointSize", setName); |
80aaae18 | 786 | var prevX = null, prevY = null; |
227b93cc | 787 | var drawPoints = this.dygraph_.attr_("drawPoints", setName); |
c3e1495b | 788 | for (var j = firstIndexInSet; j < afterLastIndexInSet; j++) { |
80aaae18 | 789 | var point = points[j]; |
c3e1495b AR |
790 | if (isNullOrNaN(point.canvasy)) { |
791 | if (stepPlot && prevX != null) { | |
792 | // Draw a horizontal line to the start of the missing data | |
793 | ctx.beginPath(); | |
794 | ctx.strokeStyle = color; | |
795 | ctx.lineWidth = this.attr_('strokeWidth'); | |
796 | ctx.moveTo(prevX, prevY); | |
797 | ctx.lineTo(point.canvasx, prevY); | |
798 | ctx.stroke(); | |
799 | } | |
800 | // this will make us move to the next point, not draw a line to it. | |
801 | prevX = prevY = null; | |
802 | } else { | |
803 | // A point is "isolated" if it is non-null but both the previous | |
804 | // and next points are null. | |
805 | var isIsolated = (!prevX && (j == points.length - 1 || | |
806 | isNullOrNaN(points[j+1].canvasy))); | |
5f453f17 | 807 | if (prevX === null) { |
c3e1495b AR |
808 | prevX = point.canvasx; |
809 | prevY = point.canvasy; | |
810 | } else { | |
f9414b11 DV |
811 | // Skip over points that will be drawn in the same pixel. |
812 | if (Math.round(prevX) == Math.round(point.canvasx) && | |
813 | Math.round(prevY) == Math.round(point.canvasy)) { | |
814 | continue; | |
815 | } | |
c3e1495b AR |
816 | // TODO(antrob): skip over points that lie on a line that is already |
817 | // going to be drawn. There is no need to have more than 2 | |
818 | // consecutive points that are collinear. | |
819 | if (strokeWidth) { | |
0599d13b NN |
820 | ctx.beginPath(); |
821 | ctx.strokeStyle = color; | |
c3e1495b | 822 | ctx.lineWidth = strokeWidth; |
0599d13b | 823 | ctx.moveTo(prevX, prevY); |
c3e1495b AR |
824 | if (stepPlot) { |
825 | ctx.lineTo(point.canvasx, prevY); | |
826 | } | |
80aaae18 DV |
827 | prevX = point.canvasx; |
828 | prevY = point.canvasy; | |
c3e1495b AR |
829 | ctx.lineTo(prevX, prevY); |
830 | ctx.stroke(); | |
80aaae18 DV |
831 | } |
832 | } | |
5f453f17 DV |
833 | |
834 | if (drawPoints || isIsolated) { | |
835 | ctx.beginPath(); | |
836 | ctx.fillStyle = color; | |
837 | ctx.arc(point.canvasx, point.canvasy, pointSize, | |
838 | 0, 2 * Math.PI, false); | |
839 | ctx.fill(); | |
c3e1495b | 840 | } |
80aaae18 DV |
841 | } |
842 | } | |
c3e1495b | 843 | firstIndexInSet = afterLastIndexInSet; |
80aaae18 | 844 | } |
6a1aa64f | 845 | |
6a1aa64f DV |
846 | context.restore(); |
847 | }; |