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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 | */ |
423f5ed3 | 26 | DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) { |
9317362d | 27 | this.dygraph_ = dygraph; |
fbe31dc8 | 28 | |
fbe31dc8 | 29 | this.layout = layout; |
b0c3b730 | 30 | this.element = element; |
2cf95fff | 31 | this.elementContext = elementContext; |
fbe31dc8 DV |
32 | this.container = this.element.parentNode; |
33 | ||
fbe31dc8 DV |
34 | this.height = this.element.height; |
35 | this.width = this.element.width; | |
36 | ||
37 | // --- check whether everything is ok before we return | |
38 | if (!this.isIE && !(DygraphCanvasRenderer.isSupported(this.element))) | |
39 | throw "Canvas is not supported."; | |
40 | ||
41 | // internal state | |
42 | this.xlabels = new Array(); | |
43 | this.ylabels = new Array(); | |
ce49c2fa | 44 | this.annotations = new Array(); |
ad1798c2 | 45 | this.chartLabels = {}; |
fbe31dc8 | 46 | |
423f5ed3 DV |
47 | this.area = this.computeArea_(); |
48 | this.container.style.position = "relative"; | |
49 | this.container.style.width = this.width + "px"; | |
50 | ||
51 | // Set up a clipping area for the canvas (and the interaction canvas). | |
52 | // This ensures that we don't overdraw. | |
53 | var ctx = this.dygraph_.canvas_ctx_; | |
54 | ctx.beginPath(); | |
55 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
56 | ctx.clip(); | |
57 | ||
58 | ctx = this.dygraph_.hidden_ctx_; | |
59 | ctx.beginPath(); | |
60 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
61 | ctx.clip(); | |
62 | }; | |
63 | ||
64 | DygraphCanvasRenderer.prototype.attr_ = function(x) { | |
65 | return this.dygraph_.attr_(x); | |
66 | }; | |
67 | ||
68 | // Compute the box which the chart should be drawn in. This is the canvas's | |
69 | // box, less space needed for axis and chart labels. | |
0e23cfc6 | 70 | // TODO(danvk): this belongs in DygraphLayout. |
423f5ed3 DV |
71 | DygraphCanvasRenderer.prototype.computeArea_ = function() { |
72 | var area = { | |
9012dd21 | 73 | // TODO(danvk): per-axis setting. |
520c8080 | 74 | x: 0, |
fbe31dc8 DV |
75 | y: 0 |
76 | }; | |
520c8080 DV |
77 | if (this.attr_('drawYAxis')) { |
78 | area.x = this.attr_('yAxisLabelWidth') + 2 * this.attr_('axisTickSize'); | |
79 | } | |
80 | ||
423f5ed3 | 81 | area.w = this.width - area.x - this.attr_('rightGap'); |
520c8080 DV |
82 | area.h = this.height; |
83 | if (this.attr_('drawXAxis')) { | |
063e83ba DV |
84 | if (this.attr_('xAxisHeight')) { |
85 | area.h -= this.attr_('xAxisHeight'); | |
86 | } else { | |
87 | area.h -= this.attr_('axisLabelFontSize') + 2 * this.attr_('axisTickSize'); | |
88 | } | |
520c8080 | 89 | } |
fbe31dc8 | 90 | |
26ca7938 DV |
91 | // Shrink the drawing area to accomodate additional y-axes. |
92 | if (this.dygraph_.numAxes() == 2) { | |
93 | // TODO(danvk): per-axis setting. | |
423f5ed3 | 94 | area.w -= (this.attr_('yAxisLabelWidth') + 2 * this.attr_('axisTickSize')); |
26ca7938 DV |
95 | } else if (this.dygraph_.numAxes() > 2) { |
96 | this.dygraph_.error("Only two y-axes are supported at this time. (Trying " + | |
34de8b76 | 97 | "to use " + this.dygraph_.numAxes() + ")"); |
26ca7938 DV |
98 | } |
99 | ||
ad1798c2 DV |
100 | // Add space for chart labels: title, xlabel and ylabel. |
101 | if (this.attr_('title')) { | |
423f5ed3 DV |
102 | area.h -= this.attr_('titleHeight'); |
103 | area.y += this.attr_('titleHeight'); | |
ad1798c2 DV |
104 | } |
105 | if (this.attr_('xlabel')) { | |
423f5ed3 | 106 | area.h -= this.attr_('xLabelHeight'); |
ad1798c2 DV |
107 | } |
108 | if (this.attr_('ylabel')) { | |
ca49434a DV |
109 | // It would make sense to shift the chart here to make room for the y-axis |
110 | // label, but the default yAxisLabelWidth is large enough that this results | |
111 | // in overly-padded charts. The y-axis label should fit fine. If it | |
112 | // doesn't, the yAxisLabelWidth option can be increased. | |
ad1798c2 DV |
113 | } |
114 | ||
423f5ed3 | 115 | return area; |
44c6bc29 DV |
116 | }; |
117 | ||
fbe31dc8 DV |
118 | DygraphCanvasRenderer.prototype.clear = function() { |
119 | if (this.isIE) { | |
120 | // VML takes a while to start up, so we just poll every this.IEDelay | |
121 | try { | |
122 | if (this.clearDelay) { | |
123 | this.clearDelay.cancel(); | |
124 | this.clearDelay = null; | |
125 | } | |
2cf95fff | 126 | var context = this.elementContext; |
fbe31dc8 DV |
127 | } |
128 | catch (e) { | |
76171648 | 129 | // TODO(danvk): this is broken, since MochiKit.Async is gone. |
fbe31dc8 DV |
130 | this.clearDelay = MochiKit.Async.wait(this.IEDelay); |
131 | this.clearDelay.addCallback(bind(this.clear, this)); | |
132 | return; | |
133 | } | |
134 | } | |
135 | ||
2cf95fff | 136 | var context = this.elementContext; |
fbe31dc8 DV |
137 | context.clearRect(0, 0, this.width, this.height); |
138 | ||
2160ed4a | 139 | for (var i = 0; i < this.xlabels.length; i++) { |
b0c3b730 | 140 | var el = this.xlabels[i]; |
b304aaec | 141 | if (el.parentNode) el.parentNode.removeChild(el); |
2160ed4a DV |
142 | } |
143 | for (var i = 0; i < this.ylabels.length; i++) { | |
b0c3b730 | 144 | var el = this.ylabels[i]; |
b304aaec | 145 | if (el.parentNode) el.parentNode.removeChild(el); |
2160ed4a | 146 | } |
ce49c2fa DV |
147 | for (var i = 0; i < this.annotations.length; i++) { |
148 | var el = this.annotations[i]; | |
b304aaec | 149 | if (el.parentNode) el.parentNode.removeChild(el); |
ce49c2fa | 150 | } |
ad1798c2 DV |
151 | for (var k in this.chartLabels) { |
152 | if (!this.chartLabels.hasOwnProperty(k)) continue; | |
153 | var el = this.chartLabels[k]; | |
154 | if (el.parentNode) el.parentNode.removeChild(el); | |
155 | } | |
fbe31dc8 DV |
156 | this.xlabels = new Array(); |
157 | this.ylabels = new Array(); | |
ce49c2fa | 158 | this.annotations = new Array(); |
ad1798c2 | 159 | this.chartLabels = {}; |
fbe31dc8 DV |
160 | }; |
161 | ||
162 | ||
163 | DygraphCanvasRenderer.isSupported = function(canvasName) { | |
164 | var canvas = null; | |
165 | try { | |
21d3323f | 166 | if (typeof(canvasName) == 'undefined' || canvasName == null) |
b0c3b730 | 167 | canvas = document.createElement("canvas"); |
fbe31dc8 | 168 | else |
b0c3b730 | 169 | canvas = canvasName; |
fbe31dc8 DV |
170 | var context = canvas.getContext("2d"); |
171 | } | |
172 | catch (e) { | |
173 | var ie = navigator.appVersion.match(/MSIE (\d\.\d)/); | |
174 | var opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1); | |
175 | if ((!ie) || (ie[1] < 6) || (opera)) | |
176 | return false; | |
177 | return true; | |
178 | } | |
179 | return true; | |
6a1aa64f | 180 | }; |
6a1aa64f DV |
181 | |
182 | /** | |
600d841a DV |
183 | * @param { [String] } colors Array of color strings. Should have one entry for |
184 | * each series to be rendered. | |
185 | */ | |
186 | DygraphCanvasRenderer.prototype.setColors = function(colors) { | |
187 | this.colorScheme_ = colors; | |
188 | }; | |
189 | ||
190 | /** | |
6a1aa64f DV |
191 | * Draw an X/Y grid on top of the existing plot |
192 | */ | |
285a6bda | 193 | DygraphCanvasRenderer.prototype.render = function() { |
528ce7e5 DV |
194 | // Draw the new X/Y grid. Lines appear crisper when pixels are rounded to |
195 | // half-integers. This prevents them from drawing in two rows/cols. | |
2cf95fff | 196 | var ctx = this.elementContext; |
528ce7e5 DV |
197 | function halfUp(x){return Math.round(x)+0.5}; |
198 | function halfDown(y){return Math.round(y)-0.5}; | |
e7746234 | 199 | |
423f5ed3 | 200 | if (this.attr_('underlayCallback')) { |
1e41bd2d DV |
201 | // NOTE: we pass the dygraph object to this callback twice to avoid breaking |
202 | // users who expect a deprecated form of this callback. | |
423f5ed3 | 203 | this.attr_('underlayCallback')(ctx, this.area, this.dygraph_, this.dygraph_); |
e7746234 EC |
204 | } |
205 | ||
423f5ed3 | 206 | if (this.attr_('drawYGrid')) { |
6a1aa64f DV |
207 | var ticks = this.layout.yticks; |
208 | ctx.save(); | |
423f5ed3 | 209 | ctx.strokeStyle = this.attr_('gridLineColor'); |
990d6a35 | 210 | ctx.lineWidth = this.attr_('gridLineWidth'); |
6a1aa64f | 211 | for (var i = 0; i < ticks.length; i++) { |
880a574f DV |
212 | // TODO(danvk): allow secondary axes to draw a grid, too. |
213 | if (ticks[i][0] != 0) continue; | |
528ce7e5 DV |
214 | var x = halfUp(this.area.x); |
215 | var y = halfDown(this.area.y + ticks[i][1] * this.area.h); | |
6a1aa64f DV |
216 | ctx.beginPath(); |
217 | ctx.moveTo(x, y); | |
218 | ctx.lineTo(x + this.area.w, y); | |
219 | ctx.closePath(); | |
220 | ctx.stroke(); | |
221 | } | |
222 | } | |
223 | ||
423f5ed3 | 224 | if (this.attr_('drawXGrid')) { |
6a1aa64f DV |
225 | var ticks = this.layout.xticks; |
226 | ctx.save(); | |
423f5ed3 | 227 | ctx.strokeStyle = this.attr_('gridLineColor'); |
990d6a35 | 228 | ctx.lineWidth = this.attr_('gridLineWidth'); |
6a1aa64f | 229 | for (var i=0; i<ticks.length; i++) { |
528ce7e5 DV |
230 | var x = halfUp(this.area.x + ticks[i][0] * this.area.w); |
231 | var y = halfDown(this.area.y + this.area.h); | |
6a1aa64f | 232 | ctx.beginPath(); |
880a574f | 233 | ctx.moveTo(x, y); |
6a1aa64f DV |
234 | ctx.lineTo(x, this.area.y); |
235 | ctx.closePath(); | |
236 | ctx.stroke(); | |
237 | } | |
238 | } | |
2ce09b19 DV |
239 | |
240 | // Do the ordinary rendering, as before | |
2ce09b19 | 241 | this._renderLineChart(); |
fbe31dc8 | 242 | this._renderAxis(); |
ad1798c2 | 243 | this._renderChartLabels(); |
ce49c2fa | 244 | this._renderAnnotations(); |
fbe31dc8 DV |
245 | }; |
246 | ||
247 | ||
248 | DygraphCanvasRenderer.prototype._renderAxis = function() { | |
423f5ed3 | 249 | if (!this.attr_('drawXAxis') && !this.attr_('drawYAxis')) return; |
fbe31dc8 | 250 | |
528ce7e5 DV |
251 | // Round pixels to half-integer boundaries for crisper drawing. |
252 | function halfUp(x){return Math.round(x)+0.5}; | |
253 | function halfDown(y){return Math.round(y)-0.5}; | |
254 | ||
2cf95fff | 255 | var context = this.elementContext; |
fbe31dc8 | 256 | |
34fedff8 | 257 | var labelStyle = { |
423f5ed3 DV |
258 | position: "absolute", |
259 | fontSize: this.attr_('axisLabelFontSize') + "px", | |
260 | zIndex: 10, | |
261 | color: this.attr_('axisLabelColor'), | |
262 | width: this.attr_('axisLabelWidth') + "px", | |
74a5af31 | 263 | // height: this.attr_('axisLabelFontSize') + 2 + "px", |
423f5ed3 | 264 | overflow: "hidden" |
34fedff8 | 265 | }; |
48e614ac | 266 | var makeDiv = function(txt, axis, prec_axis) { |
34fedff8 DV |
267 | var div = document.createElement("div"); |
268 | for (var name in labelStyle) { | |
85b99f0b DV |
269 | if (labelStyle.hasOwnProperty(name)) { |
270 | div.style[name] = labelStyle[name]; | |
271 | } | |
fbe31dc8 | 272 | } |
ba451526 | 273 | var inner_div = document.createElement("div"); |
48e614ac DV |
274 | inner_div.className = 'dygraph-axis-label' + |
275 | ' dygraph-axis-label-' + axis + | |
276 | (prec_axis ? ' dygraph-axis-label-' + prec_axis : ''); | |
ba451526 DV |
277 | inner_div.appendChild(document.createTextNode(txt)); |
278 | div.appendChild(inner_div); | |
34fedff8 | 279 | return div; |
fbe31dc8 DV |
280 | }; |
281 | ||
282 | // axis lines | |
283 | context.save(); | |
423f5ed3 DV |
284 | context.strokeStyle = this.attr_('axisLineColor'); |
285 | context.lineWidth = this.attr_('axisLineWidth'); | |
fbe31dc8 | 286 | |
423f5ed3 | 287 | if (this.attr_('drawYAxis')) { |
8b7a0cc3 | 288 | if (this.layout.yticks && this.layout.yticks.length > 0) { |
48e614ac | 289 | var num_axes = this.dygraph_.numAxes(); |
2160ed4a DV |
290 | for (var i = 0; i < this.layout.yticks.length; i++) { |
291 | var tick = this.layout.yticks[i]; | |
fbe31dc8 DV |
292 | if (typeof(tick) == "function") return; |
293 | var x = this.area.x; | |
880a574f | 294 | var sgn = 1; |
48e614ac | 295 | var prec_axis = 'y1'; |
880a574f DV |
296 | if (tick[0] == 1) { // right-side y-axis |
297 | x = this.area.x + this.area.w; | |
298 | sgn = -1; | |
48e614ac | 299 | prec_axis = 'y2'; |
9012dd21 DV |
300 | } |
301 | var y = this.area.y + tick[1] * this.area.h; | |
fbe31dc8 | 302 | context.beginPath(); |
528ce7e5 | 303 | context.moveTo(halfUp(x), halfDown(y)); |
0e23cfc6 | 304 | context.lineTo(halfUp(x - sgn * this.attr_('axisTickSize')), halfDown(y)); |
fbe31dc8 DV |
305 | context.closePath(); |
306 | context.stroke(); | |
307 | ||
48e614ac | 308 | var label = makeDiv(tick[2], 'y', num_axes == 2 ? prec_axis : null); |
423f5ed3 | 309 | var top = (y - this.attr_('axisLabelFontSize') / 2); |
fbe31dc8 DV |
310 | if (top < 0) top = 0; |
311 | ||
423f5ed3 | 312 | if (top + this.attr_('axisLabelFontSize') + 3 > this.height) { |
fbe31dc8 DV |
313 | label.style.bottom = "0px"; |
314 | } else { | |
315 | label.style.top = top + "px"; | |
316 | } | |
9012dd21 | 317 | if (tick[0] == 0) { |
423f5ed3 | 318 | label.style.left = (this.area.x - this.attr_('yAxisLabelWidth') - this.attr_('axisTickSize')) + "px"; |
9012dd21 DV |
319 | label.style.textAlign = "right"; |
320 | } else if (tick[0] == 1) { | |
321 | label.style.left = (this.area.x + this.area.w + | |
423f5ed3 | 322 | this.attr_('axisTickSize')) + "px"; |
9012dd21 DV |
323 | label.style.textAlign = "left"; |
324 | } | |
423f5ed3 | 325 | label.style.width = this.attr_('yAxisLabelWidth') + "px"; |
b0c3b730 | 326 | this.container.appendChild(label); |
fbe31dc8 | 327 | this.ylabels.push(label); |
2160ed4a | 328 | } |
fbe31dc8 DV |
329 | |
330 | // The lowest tick on the y-axis often overlaps with the leftmost | |
331 | // tick on the x-axis. Shift the bottom tick up a little bit to | |
332 | // compensate if necessary. | |
333 | var bottomTick = this.ylabels[0]; | |
423f5ed3 | 334 | var fontSize = this.attr_('axisLabelFontSize'); |
fbe31dc8 DV |
335 | var bottom = parseInt(bottomTick.style.top) + fontSize; |
336 | if (bottom > this.height - fontSize) { | |
337 | bottomTick.style.top = (parseInt(bottomTick.style.top) - | |
338 | fontSize / 2) + "px"; | |
339 | } | |
340 | } | |
341 | ||
528ce7e5 | 342 | // draw a vertical line on the left to separate the chart from the labels. |
fbe31dc8 | 343 | context.beginPath(); |
528ce7e5 DV |
344 | context.moveTo(halfUp(this.area.x), halfDown(this.area.y)); |
345 | context.lineTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h)); | |
fbe31dc8 DV |
346 | context.closePath(); |
347 | context.stroke(); | |
c1dbeb10 | 348 | |
528ce7e5 | 349 | // if there's a secondary y-axis, draw a vertical line for that, too. |
c1dbeb10 DV |
350 | if (this.dygraph_.numAxes() == 2) { |
351 | context.beginPath(); | |
528ce7e5 DV |
352 | context.moveTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y)); |
353 | context.lineTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); | |
c1dbeb10 DV |
354 | context.closePath(); |
355 | context.stroke(); | |
356 | } | |
fbe31dc8 DV |
357 | } |
358 | ||
423f5ed3 | 359 | if (this.attr_('drawXAxis')) { |
fbe31dc8 | 360 | if (this.layout.xticks) { |
2160ed4a DV |
361 | for (var i = 0; i < this.layout.xticks.length; i++) { |
362 | var tick = this.layout.xticks[i]; | |
fbe31dc8 DV |
363 | if (typeof(dataset) == "function") return; |
364 | ||
365 | var x = this.area.x + tick[0] * this.area.w; | |
366 | var y = this.area.y + this.area.h; | |
367 | context.beginPath(); | |
528ce7e5 | 368 | context.moveTo(halfUp(x), halfDown(y)); |
423f5ed3 | 369 | context.lineTo(halfUp(x), halfDown(y + this.attr_('axisTickSize'))); |
fbe31dc8 DV |
370 | context.closePath(); |
371 | context.stroke(); | |
372 | ||
ba451526 | 373 | var label = makeDiv(tick[1], 'x'); |
fbe31dc8 | 374 | label.style.textAlign = "center"; |
423f5ed3 | 375 | label.style.top = (y + this.attr_('axisTickSize')) + 'px'; |
fbe31dc8 | 376 | |
423f5ed3 DV |
377 | var left = (x - this.attr_('axisLabelWidth')/2); |
378 | if (left + this.attr_('axisLabelWidth') > this.width) { | |
379 | left = this.width - this.attr_('xAxisLabelWidth'); | |
fbe31dc8 DV |
380 | label.style.textAlign = "right"; |
381 | } | |
382 | if (left < 0) { | |
383 | left = 0; | |
384 | label.style.textAlign = "left"; | |
385 | } | |
386 | ||
387 | label.style.left = left + "px"; | |
423f5ed3 | 388 | label.style.width = this.attr_('xAxisLabelWidth') + "px"; |
b0c3b730 | 389 | this.container.appendChild(label); |
fbe31dc8 | 390 | this.xlabels.push(label); |
2160ed4a | 391 | } |
fbe31dc8 DV |
392 | } |
393 | ||
394 | context.beginPath(); | |
528ce7e5 DV |
395 | context.moveTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h)); |
396 | context.lineTo(halfUp(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); | |
fbe31dc8 DV |
397 | context.closePath(); |
398 | context.stroke(); | |
399 | } | |
400 | ||
401 | context.restore(); | |
6a1aa64f DV |
402 | }; |
403 | ||
fbe31dc8 | 404 | |
ad1798c2 DV |
405 | DygraphCanvasRenderer.prototype._renderChartLabels = function() { |
406 | // Generate divs for the chart title, xlabel and ylabel. | |
407 | // Space for these divs has already been taken away from the charting area in | |
408 | // the DygraphCanvasRenderer constructor. | |
409 | if (this.attr_('title')) { | |
410 | var div = document.createElement("div"); | |
411 | div.style.position = 'absolute'; | |
412 | div.style.top = '0px'; | |
413 | div.style.left = this.area.x + 'px'; | |
414 | div.style.width = this.area.w + 'px'; | |
415 | div.style.height = this.attr_('titleHeight') + 'px'; | |
416 | div.style.textAlign = 'center'; | |
b4202b3d | 417 | div.style.fontSize = (this.attr_('titleHeight') - 8) + 'px'; |
ad1798c2 | 418 | div.style.fontWeight = 'bold'; |
ca49434a DV |
419 | var class_div = document.createElement("div"); |
420 | class_div.className = 'dygraph-label dygraph-title'; | |
421 | class_div.innerHTML = this.attr_('title'); | |
422 | div.appendChild(class_div); | |
ad1798c2 DV |
423 | this.container.appendChild(div); |
424 | this.chartLabels.title = div; | |
425 | } | |
426 | ||
427 | if (this.attr_('xlabel')) { | |
428 | var div = document.createElement("div"); | |
429 | div.style.position = 'absolute'; | |
430 | div.style.bottom = 0; // TODO(danvk): this is lazy. Calculate style.top. | |
431 | div.style.left = this.area.x + 'px'; | |
432 | div.style.width = this.area.w + 'px'; | |
433 | div.style.height = this.attr_('xLabelHeight') + 'px'; | |
434 | div.style.textAlign = 'center'; | |
86cce9e8 | 435 | div.style.fontSize = (this.attr_('xLabelHeight') - 2) + 'px'; |
ca49434a DV |
436 | |
437 | var class_div = document.createElement("div"); | |
438 | class_div.className = 'dygraph-label dygraph-xlabel'; | |
439 | class_div.innerHTML = this.attr_('xlabel'); | |
440 | div.appendChild(class_div); | |
ad1798c2 DV |
441 | this.container.appendChild(div); |
442 | this.chartLabels.xlabel = div; | |
443 | } | |
444 | ||
445 | if (this.attr_('ylabel')) { | |
446 | var box = { | |
447 | left: 0, | |
448 | top: this.area.y, | |
449 | width: this.attr_('yLabelWidth'), | |
450 | height: this.area.h | |
451 | }; | |
ca49434a | 452 | // TODO(danvk): is this outer div actually necessary? |
ad1798c2 DV |
453 | var div = document.createElement("div"); |
454 | div.style.position = 'absolute'; | |
455 | div.style.left = box.left; | |
456 | div.style.top = box.top + 'px'; | |
457 | div.style.width = box.width + 'px'; | |
458 | div.style.height = box.height + 'px'; | |
86cce9e8 | 459 | div.style.fontSize = (this.attr_('yLabelWidth') - 2) + 'px'; |
ad1798c2 DV |
460 | |
461 | var inner_div = document.createElement("div"); | |
462 | inner_div.style.position = 'absolute'; | |
ad1798c2 DV |
463 | inner_div.style.width = box.height + 'px'; |
464 | inner_div.style.height = box.width + 'px'; | |
465 | inner_div.style.top = (box.height / 2 - box.width / 2) + 'px'; | |
466 | inner_div.style.left = (box.width / 2 - box.height / 2) + 'px'; | |
467 | inner_div.style.textAlign = 'center'; | |
b56b6993 DV |
468 | |
469 | // CSS rotation is an HTML5 feature which is not standardized. Hence every | |
470 | // browser has its own name for the CSS style. | |
ad1798c2 DV |
471 | inner_div.style.transform = 'rotate(-90deg)'; // HTML5 |
472 | inner_div.style.WebkitTransform = 'rotate(-90deg)'; // Safari/Chrome | |
473 | inner_div.style.MozTransform = 'rotate(-90deg)'; // Firefox | |
474 | inner_div.style.OTransform = 'rotate(-90deg)'; // Opera | |
52c47e80 | 475 | inner_div.style.msTransform = 'rotate(-90deg)'; // IE9 |
b56b6993 DV |
476 | |
477 | if (typeof(document.documentMode) !== 'undefined' && | |
478 | document.documentMode < 9) { | |
479 | // We're dealing w/ an old version of IE, so we have to rotate the text | |
480 | // using a BasicImage transform. This uses a different origin of rotation | |
481 | // than HTML5 rotation (top left of div vs. its center). | |
482 | inner_div.style.filter = | |
483 | 'progid:DXImageTransform.Microsoft.BasicImage(rotation=3)'; | |
484 | inner_div.style.left = '0px'; | |
485 | inner_div.style.top = '0px'; | |
486 | } | |
ad1798c2 | 487 | |
ca49434a DV |
488 | var class_div = document.createElement("div"); |
489 | class_div.className = 'dygraph-label dygraph-ylabel'; | |
490 | class_div.innerHTML = this.attr_('ylabel'); | |
491 | ||
492 | inner_div.appendChild(class_div); | |
ad1798c2 DV |
493 | div.appendChild(inner_div); |
494 | this.container.appendChild(div); | |
495 | this.chartLabels.ylabel = div; | |
496 | } | |
497 | }; | |
498 | ||
499 | ||
ce49c2fa DV |
500 | DygraphCanvasRenderer.prototype._renderAnnotations = function() { |
501 | var annotationStyle = { | |
502 | "position": "absolute", | |
423f5ed3 | 503 | "fontSize": this.attr_('axisLabelFontSize') + "px", |
ce49c2fa | 504 | "zIndex": 10, |
3bf2fa91 | 505 | "overflow": "hidden" |
ce49c2fa DV |
506 | }; |
507 | ||
ab5e5c75 DV |
508 | var bindEvt = function(eventName, classEventName, p, self) { |
509 | return function(e) { | |
510 | var a = p.annotation; | |
511 | if (a.hasOwnProperty(eventName)) { | |
512 | a[eventName](a, p, self.dygraph_, e); | |
513 | } else if (self.dygraph_.attr_(classEventName)) { | |
514 | self.dygraph_.attr_(classEventName)(a, p, self.dygraph_,e ); | |
515 | } | |
516 | }; | |
517 | } | |
518 | ||
ce49c2fa DV |
519 | // Get a list of point with annotations. |
520 | var points = this.layout.annotated_points; | |
521 | for (var i = 0; i < points.length; i++) { | |
522 | var p = points[i]; | |
e6d53148 DV |
523 | if (p.canvasx < this.area.x || p.canvasx > this.area.x + this.area.w) { |
524 | continue; | |
525 | } | |
526 | ||
ce5e8d36 DV |
527 | var a = p.annotation; |
528 | var tick_height = 6; | |
529 | if (a.hasOwnProperty("tickHeight")) { | |
530 | tick_height = a.tickHeight; | |
9a40897e DV |
531 | } |
532 | ||
ce49c2fa DV |
533 | var div = document.createElement("div"); |
534 | for (var name in annotationStyle) { | |
535 | if (annotationStyle.hasOwnProperty(name)) { | |
536 | div.style[name] = annotationStyle[name]; | |
537 | } | |
538 | } | |
ce5e8d36 DV |
539 | if (!a.hasOwnProperty('icon')) { |
540 | div.className = "dygraphDefaultAnnotation"; | |
541 | } | |
542 | if (a.hasOwnProperty('cssClass')) { | |
543 | div.className += " " + a.cssClass; | |
544 | } | |
545 | ||
a5ad69cc DV |
546 | var width = a.hasOwnProperty('width') ? a.width : 16; |
547 | var height = a.hasOwnProperty('height') ? a.height : 16; | |
ce5e8d36 DV |
548 | if (a.hasOwnProperty('icon')) { |
549 | var img = document.createElement("img"); | |
550 | img.src = a.icon; | |
33030f33 DV |
551 | img.width = width; |
552 | img.height = height; | |
ce5e8d36 DV |
553 | div.appendChild(img); |
554 | } else if (p.annotation.hasOwnProperty('shortText')) { | |
555 | div.appendChild(document.createTextNode(p.annotation.shortText)); | |
5c528fa2 | 556 | } |
ce5e8d36 | 557 | div.style.left = (p.canvasx - width / 2) + "px"; |
d14b9eed DV |
558 | if (a.attachAtBottom) { |
559 | div.style.top = (this.area.h - height - tick_height) + "px"; | |
560 | } else { | |
561 | div.style.top = (p.canvasy - height - tick_height) + "px"; | |
562 | } | |
ce5e8d36 DV |
563 | div.style.width = width + "px"; |
564 | div.style.height = height + "px"; | |
ce49c2fa DV |
565 | div.title = p.annotation.text; |
566 | div.style.color = this.colors[p.name]; | |
567 | div.style.borderColor = this.colors[p.name]; | |
e6d53148 | 568 | a.div = div; |
ab5e5c75 | 569 | |
9a40897e DV |
570 | Dygraph.addEvent(div, 'click', |
571 | bindEvt('clickHandler', 'annotationClickHandler', p, this)); | |
572 | Dygraph.addEvent(div, 'mouseover', | |
573 | bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p, this)); | |
574 | Dygraph.addEvent(div, 'mouseout', | |
575 | bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p, this)); | |
576 | Dygraph.addEvent(div, 'dblclick', | |
577 | bindEvt('dblClickHandler', 'annotationDblClickHandler', p, this)); | |
ab5e5c75 | 578 | |
ce49c2fa DV |
579 | this.container.appendChild(div); |
580 | this.annotations.push(div); | |
9a40897e | 581 | |
2cf95fff | 582 | var ctx = this.elementContext; |
9a40897e DV |
583 | ctx.strokeStyle = this.colors[p.name]; |
584 | ctx.beginPath(); | |
d14b9eed DV |
585 | if (!a.attachAtBottom) { |
586 | ctx.moveTo(p.canvasx, p.canvasy); | |
587 | ctx.lineTo(p.canvasx, p.canvasy - 2 - tick_height); | |
588 | } else { | |
589 | ctx.moveTo(p.canvasx, this.area.h); | |
590 | ctx.lineTo(p.canvasx, this.area.h - 2 - tick_height); | |
591 | } | |
9a40897e DV |
592 | ctx.closePath(); |
593 | ctx.stroke(); | |
ce49c2fa DV |
594 | } |
595 | }; | |
596 | ||
597 | ||
6a1aa64f DV |
598 | /** |
599 | * Overrides the CanvasRenderer method to draw error bars | |
600 | */ | |
285a6bda | 601 | DygraphCanvasRenderer.prototype._renderLineChart = function() { |
f9414b11 DV |
602 | var isNullOrNaN = function(x) { |
603 | return (x === null || isNaN(x)); | |
604 | }; | |
605 | ||
44c6bc29 | 606 | // TODO(danvk): use this.attr_ for many of these. |
2cf95fff | 607 | var context = this.elementContext; |
423f5ed3 | 608 | var fillAlpha = this.attr_('fillAlpha'); |
e4182459 | 609 | var errorBars = this.attr_("errorBars") || this.attr_("customBars"); |
44c6bc29 | 610 | var fillGraph = this.attr_("fillGraph"); |
b2c9222a DV |
611 | var stackedGraph = this.attr_("stackedGraph"); |
612 | var stepPlot = this.attr_("stepPlot"); | |
c3e1495b AR |
613 | var points = this.layout.points; |
614 | var pointsLength = points.length; | |
21d3323f DV |
615 | |
616 | var setNames = []; | |
ca43052c | 617 | for (var name in this.layout.datasets) { |
85b99f0b DV |
618 | if (this.layout.datasets.hasOwnProperty(name)) { |
619 | setNames.push(name); | |
620 | } | |
ca43052c | 621 | } |
21d3323f | 622 | var setCount = setNames.length; |
6a1aa64f | 623 | |
0e23cfc6 | 624 | // TODO(danvk): Move this mapping into Dygraph and get it out of here. |
f032c51d AV |
625 | this.colors = {} |
626 | for (var i = 0; i < setCount; i++) { | |
600d841a | 627 | this.colors[setNames[i]] = this.colorScheme_[i % this.colorScheme_.length]; |
f032c51d AV |
628 | } |
629 | ||
ff00d3e2 DV |
630 | // Update Points |
631 | // TODO(danvk): here | |
c3e1495b AR |
632 | for (var i = pointsLength; i--;) { |
633 | var point = points[i]; | |
6a1aa64f DV |
634 | point.canvasx = this.area.w * point.x + this.area.x; |
635 | point.canvasy = this.area.h * point.y + this.area.y; | |
636 | } | |
6a1aa64f DV |
637 | |
638 | // create paths | |
80aaae18 DV |
639 | var ctx = context; |
640 | if (errorBars) { | |
6a834bbb DV |
641 | if (fillGraph) { |
642 | this.dygraph_.warn("Can't use fillGraph option with error bars"); | |
643 | } | |
644 | ||
6a1aa64f DV |
645 | for (var i = 0; i < setCount; i++) { |
646 | var setName = setNames[i]; | |
b2c9222a | 647 | var axis = this.dygraph_.axisPropertiesForSeries(setName); |
f032c51d | 648 | var color = this.colors[setName]; |
6a1aa64f DV |
649 | |
650 | // setup graphics context | |
80aaae18 | 651 | ctx.save(); |
56623f3b | 652 | var prevX = NaN; |
afdc483f | 653 | var prevY = NaN; |
6a1aa64f | 654 | var prevYs = [-1, -1]; |
ea4942ed | 655 | var yscale = axis.yscale; |
f474c2a3 DV |
656 | // should be same color as the lines but only 15% opaque. |
657 | var rgb = new RGBColor(color); | |
43af96e7 NK |
658 | var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + |
659 | fillAlpha + ')'; | |
f474c2a3 | 660 | ctx.fillStyle = err_color; |
05c9d0c4 | 661 | ctx.beginPath(); |
c3e1495b AR |
662 | for (var j = 0; j < pointsLength; j++) { |
663 | var point = points[j]; | |
6a1aa64f | 664 | if (point.name == setName) { |
e9fe4a2f | 665 | if (!Dygraph.isOK(point.y)) { |
56623f3b | 666 | prevX = NaN; |
ae85914a | 667 | continue; |
5011e7a1 | 668 | } |
ce49c2fa | 669 | |
3637724f | 670 | // TODO(danvk): here |
afdc483f | 671 | if (stepPlot) { |
7f028980 | 672 | var newYs = [ point.y_bottom, point.y_top ]; |
afdc483f NN |
673 | prevY = point.y; |
674 | } else { | |
7f028980 | 675 | var newYs = [ point.y_bottom, point.y_top ]; |
afdc483f | 676 | } |
6a1aa64f DV |
677 | newYs[0] = this.area.h * newYs[0] + this.area.y; |
678 | newYs[1] = this.area.h * newYs[1] + this.area.y; | |
56623f3b | 679 | if (!isNaN(prevX)) { |
afdc483f | 680 | if (stepPlot) { |
47600757 | 681 | ctx.moveTo(prevX, newYs[0]); |
afdc483f | 682 | } else { |
47600757 | 683 | ctx.moveTo(prevX, prevYs[0]); |
afdc483f | 684 | } |
5954ef32 DV |
685 | ctx.lineTo(point.canvasx, newYs[0]); |
686 | ctx.lineTo(point.canvasx, newYs[1]); | |
afdc483f | 687 | if (stepPlot) { |
47600757 | 688 | ctx.lineTo(prevX, newYs[1]); |
afdc483f | 689 | } else { |
47600757 | 690 | ctx.lineTo(prevX, prevYs[1]); |
afdc483f | 691 | } |
5954ef32 DV |
692 | ctx.closePath(); |
693 | } | |
354e15ab | 694 | prevYs = newYs; |
5954ef32 DV |
695 | prevX = point.canvasx; |
696 | } | |
697 | } | |
698 | ctx.fill(); | |
699 | } | |
700 | } else if (fillGraph) { | |
354e15ab DE |
701 | var baseline = [] // for stacked graphs: baseline for filling |
702 | ||
703 | // process sets in reverse order (needed for stacked graphs) | |
704 | for (var i = setCount - 1; i >= 0; i--) { | |
5954ef32 | 705 | var setName = setNames[i]; |
f032c51d | 706 | var color = this.colors[setName]; |
b2c9222a | 707 | var axis = this.dygraph_.axisPropertiesForSeries(setName); |
ea4942ed DV |
708 | var axisY = 1.0 + axis.minyval * axis.yscale; |
709 | if (axisY < 0.0) axisY = 0.0; | |
710 | else if (axisY > 1.0) axisY = 1.0; | |
711 | axisY = this.area.h * axisY + this.area.y; | |
5954ef32 DV |
712 | |
713 | // setup graphics context | |
714 | ctx.save(); | |
56623f3b | 715 | var prevX = NaN; |
5954ef32 | 716 | var prevYs = [-1, -1]; |
ea4942ed | 717 | var yscale = axis.yscale; |
5954ef32 DV |
718 | // should be same color as the lines but only 15% opaque. |
719 | var rgb = new RGBColor(color); | |
43af96e7 NK |
720 | var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + |
721 | fillAlpha + ')'; | |
5954ef32 DV |
722 | ctx.fillStyle = err_color; |
723 | ctx.beginPath(); | |
c3e1495b AR |
724 | for (var j = 0; j < pointsLength; j++) { |
725 | var point = points[j]; | |
5954ef32 | 726 | if (point.name == setName) { |
e9fe4a2f | 727 | if (!Dygraph.isOK(point.y)) { |
56623f3b | 728 | prevX = NaN; |
5954ef32 DV |
729 | continue; |
730 | } | |
354e15ab DE |
731 | var newYs; |
732 | if (stackedGraph) { | |
733 | lastY = baseline[point.canvasx]; | |
734 | if (lastY === undefined) lastY = axisY; | |
735 | baseline[point.canvasx] = point.canvasy; | |
736 | newYs = [ point.canvasy, lastY ]; | |
737 | } else { | |
738 | newYs = [ point.canvasy, axisY ]; | |
739 | } | |
56623f3b | 740 | if (!isNaN(prevX)) { |
05c9d0c4 | 741 | ctx.moveTo(prevX, prevYs[0]); |
afdc483f | 742 | if (stepPlot) { |
47600757 | 743 | ctx.lineTo(point.canvasx, prevYs[0]); |
afdc483f | 744 | } else { |
47600757 | 745 | ctx.lineTo(point.canvasx, newYs[0]); |
afdc483f | 746 | } |
05c9d0c4 DV |
747 | ctx.lineTo(point.canvasx, newYs[1]); |
748 | ctx.lineTo(prevX, prevYs[1]); | |
749 | ctx.closePath(); | |
6a1aa64f | 750 | } |
354e15ab | 751 | prevYs = newYs; |
6a1aa64f DV |
752 | prevX = point.canvasx; |
753 | } | |
05c9d0c4 | 754 | } |
6a1aa64f DV |
755 | ctx.fill(); |
756 | } | |
80aaae18 DV |
757 | } |
758 | ||
f9414b11 | 759 | // Drawing the lines. |
c3e1495b AR |
760 | var firstIndexInSet = 0; |
761 | var afterLastIndexInSet = 0; | |
762 | var setLength = 0; | |
763 | for (var i = 0; i < setCount; i += 1) { | |
764 | setLength = this.layout.setPointsLengths[i]; | |
765 | afterLastIndexInSet += setLength; | |
80aaae18 | 766 | var setName = setNames[i]; |
f032c51d | 767 | var color = this.colors[setName]; |
227b93cc | 768 | var strokeWidth = this.dygraph_.attr_("strokeWidth", setName); |
80aaae18 DV |
769 | |
770 | // setup graphics context | |
771 | context.save(); | |
227b93cc | 772 | var pointSize = this.dygraph_.attr_("pointSize", setName); |
80aaae18 | 773 | var prevX = null, prevY = null; |
227b93cc | 774 | var drawPoints = this.dygraph_.attr_("drawPoints", setName); |
c3e1495b | 775 | for (var j = firstIndexInSet; j < afterLastIndexInSet; j++) { |
80aaae18 | 776 | var point = points[j]; |
c3e1495b AR |
777 | if (isNullOrNaN(point.canvasy)) { |
778 | if (stepPlot && prevX != null) { | |
779 | // Draw a horizontal line to the start of the missing data | |
780 | ctx.beginPath(); | |
781 | ctx.strokeStyle = color; | |
782 | ctx.lineWidth = this.attr_('strokeWidth'); | |
783 | ctx.moveTo(prevX, prevY); | |
784 | ctx.lineTo(point.canvasx, prevY); | |
785 | ctx.stroke(); | |
786 | } | |
787 | // this will make us move to the next point, not draw a line to it. | |
788 | prevX = prevY = null; | |
789 | } else { | |
790 | // A point is "isolated" if it is non-null but both the previous | |
791 | // and next points are null. | |
792 | var isIsolated = (!prevX && (j == points.length - 1 || | |
793 | isNullOrNaN(points[j+1].canvasy))); | |
5f453f17 | 794 | if (prevX === null) { |
c3e1495b AR |
795 | prevX = point.canvasx; |
796 | prevY = point.canvasy; | |
797 | } else { | |
f9414b11 DV |
798 | // Skip over points that will be drawn in the same pixel. |
799 | if (Math.round(prevX) == Math.round(point.canvasx) && | |
800 | Math.round(prevY) == Math.round(point.canvasy)) { | |
801 | continue; | |
802 | } | |
c3e1495b AR |
803 | // TODO(antrob): skip over points that lie on a line that is already |
804 | // going to be drawn. There is no need to have more than 2 | |
805 | // consecutive points that are collinear. | |
806 | if (strokeWidth) { | |
0599d13b NN |
807 | ctx.beginPath(); |
808 | ctx.strokeStyle = color; | |
c3e1495b | 809 | ctx.lineWidth = strokeWidth; |
0599d13b | 810 | ctx.moveTo(prevX, prevY); |
c3e1495b AR |
811 | if (stepPlot) { |
812 | ctx.lineTo(point.canvasx, prevY); | |
813 | } | |
80aaae18 DV |
814 | prevX = point.canvasx; |
815 | prevY = point.canvasy; | |
c3e1495b AR |
816 | ctx.lineTo(prevX, prevY); |
817 | ctx.stroke(); | |
80aaae18 DV |
818 | } |
819 | } | |
5f453f17 DV |
820 | |
821 | if (drawPoints || isIsolated) { | |
822 | ctx.beginPath(); | |
823 | ctx.fillStyle = color; | |
824 | ctx.arc(point.canvasx, point.canvasy, pointSize, | |
825 | 0, 2 * Math.PI, false); | |
826 | ctx.fill(); | |
c3e1495b | 827 | } |
80aaae18 DV |
828 | } |
829 | } | |
c3e1495b | 830 | firstIndexInSet = afterLastIndexInSet; |
80aaae18 | 831 | } |
6a1aa64f | 832 | |
6a1aa64f DV |
833 | context.restore(); |
834 | }; |