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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 | 27 | /*jshint globalstrict: true */ |
a96b8ba3 | 28 | /*global Dygraph:false,RGBColorParser: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 | * | |
7b00a3cd | 42 | * @param {Dygraph} dygraph The chart to which this renderer belongs. |
48fc4786 | 43 | * @param {HTMLCanvasElement} element The <canvas> DOM element on which to draw. |
8cfe592f DV |
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 | |
48fc4786 | 61 | // NOTE(konigsberg): isIE is never defined in this object. Bug of some sort. |
fbe31dc8 DV |
62 | if (!this.isIE && !(DygraphCanvasRenderer.isSupported(this.element))) |
63 | throw "Canvas is not supported."; | |
64 | ||
65 | // internal state | |
70be5ed1 | 66 | this.area = layout.getPlotArea(); |
423f5ed3 DV |
67 | this.container.style.position = "relative"; |
68 | this.container.style.width = this.width + "px"; | |
69 | ||
70 | // Set up a clipping area for the canvas (and the interaction canvas). | |
71 | // This ensures that we don't overdraw. | |
920208fb PF |
72 | if (this.dygraph_.isUsingExcanvas_) { |
73 | this._createIEClipArea(); | |
74 | } else { | |
971870e5 DV |
75 | // on Android 3 and 4, setting a clipping area on a canvas prevents it from |
76 | // displaying anything. | |
77 | if (!Dygraph.isAndroid()) { | |
78 | var ctx = this.dygraph_.canvas_ctx_; | |
79 | ctx.beginPath(); | |
80 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
81 | ctx.clip(); | |
920208fb | 82 | |
971870e5 DV |
83 | ctx = this.dygraph_.hidden_ctx_; |
84 | ctx.beginPath(); | |
85 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
86 | ctx.clip(); | |
87 | } | |
920208fb | 88 | } |
423f5ed3 DV |
89 | }; |
90 | ||
38e3d209 DV |
91 | /** |
92 | * This just forwards to dygraph.attr_. | |
93 | * TODO(danvk): remove this? | |
94 | * @private | |
95 | */ | |
96 | DygraphCanvasRenderer.prototype.attr_ = function(name, opt_seriesName) { | |
97 | return this.dygraph_.attr_(name, opt_seriesName); | |
423f5ed3 DV |
98 | }; |
99 | ||
8cfe592f DV |
100 | /** |
101 | * Clears out all chart content and DOM elements. | |
102 | * This is called immediately before render() on every frame, including | |
103 | * during zooms and pans. | |
104 | * @private | |
105 | */ | |
fbe31dc8 | 106 | DygraphCanvasRenderer.prototype.clear = function() { |
758a629f | 107 | var context; |
fbe31dc8 DV |
108 | if (this.isIE) { |
109 | // VML takes a while to start up, so we just poll every this.IEDelay | |
110 | try { | |
111 | if (this.clearDelay) { | |
112 | this.clearDelay.cancel(); | |
113 | this.clearDelay = null; | |
114 | } | |
758a629f | 115 | context = this.elementContext; |
fbe31dc8 DV |
116 | } |
117 | catch (e) { | |
76171648 | 118 | // TODO(danvk): this is broken, since MochiKit.Async is gone. |
758a629f DV |
119 | // this.clearDelay = MochiKit.Async.wait(this.IEDelay); |
120 | // this.clearDelay.addCallback(bind(this.clear, this)); | |
fbe31dc8 DV |
121 | return; |
122 | } | |
123 | } | |
124 | ||
758a629f | 125 | context = this.elementContext; |
fbe31dc8 | 126 | context.clearRect(0, 0, this.width, this.height); |
fbe31dc8 DV |
127 | }; |
128 | ||
8cfe592f DV |
129 | /** |
130 | * Checks whether the browser supports the <canvas> tag. | |
131 | * @private | |
132 | */ | |
fbe31dc8 DV |
133 | DygraphCanvasRenderer.isSupported = function(canvasName) { |
134 | var canvas = null; | |
135 | try { | |
758a629f | 136 | if (typeof(canvasName) == 'undefined' || canvasName === null) { |
b0c3b730 | 137 | canvas = document.createElement("canvas"); |
758a629f | 138 | } else { |
b0c3b730 | 139 | canvas = canvasName; |
758a629f DV |
140 | } |
141 | canvas.getContext("2d"); | |
fbe31dc8 DV |
142 | } |
143 | catch (e) { | |
144 | var ie = navigator.appVersion.match(/MSIE (\d\.\d)/); | |
145 | var opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1); | |
146 | if ((!ie) || (ie[1] < 6) || (opera)) | |
147 | return false; | |
148 | return true; | |
149 | } | |
150 | return true; | |
6a1aa64f | 151 | }; |
6a1aa64f DV |
152 | |
153 | /** | |
8cfe592f DV |
154 | * This method is responsible for drawing everything on the chart, including |
155 | * lines, error bars, fills and axes. | |
156 | * It is called immediately after clear() on every frame, including during pans | |
157 | * and zooms. | |
158 | * @private | |
6a1aa64f | 159 | */ |
285a6bda | 160 | DygraphCanvasRenderer.prototype.render = function() { |
38e3d209 DV |
161 | // attaches point.canvas{x,y} |
162 | this._updatePoints(); | |
163 | ||
164 | // actually draws the chart. | |
2ce09b19 | 165 | this._renderLineChart(); |
fbe31dc8 DV |
166 | }; |
167 | ||
920208fb PF |
168 | DygraphCanvasRenderer.prototype._createIEClipArea = function() { |
169 | var className = 'dygraph-clip-div'; | |
170 | var graphDiv = this.dygraph_.graphDiv; | |
171 | ||
172 | // Remove old clip divs. | |
173 | for (var i = graphDiv.childNodes.length-1; i >= 0; i--) { | |
174 | if (graphDiv.childNodes[i].className == className) { | |
175 | graphDiv.removeChild(graphDiv.childNodes[i]); | |
176 | } | |
177 | } | |
178 | ||
179 | // Determine background color to give clip divs. | |
180 | var backgroundColor = document.bgColor; | |
181 | var element = this.dygraph_.graphDiv; | |
182 | while (element != document) { | |
183 | var bgcolor = element.currentStyle.backgroundColor; | |
184 | if (bgcolor && bgcolor != 'transparent') { | |
185 | backgroundColor = bgcolor; | |
186 | break; | |
187 | } | |
188 | element = element.parentNode; | |
189 | } | |
190 | ||
191 | function createClipDiv(area) { | |
758a629f | 192 | if (area.w === 0 || area.h === 0) { |
920208fb PF |
193 | return; |
194 | } | |
195 | var elem = document.createElement('div'); | |
196 | elem.className = className; | |
197 | elem.style.backgroundColor = backgroundColor; | |
198 | elem.style.position = 'absolute'; | |
199 | elem.style.left = area.x + 'px'; | |
200 | elem.style.top = area.y + 'px'; | |
201 | elem.style.width = area.w + 'px'; | |
202 | elem.style.height = area.h + 'px'; | |
203 | graphDiv.appendChild(elem); | |
204 | } | |
205 | ||
206 | var plotArea = this.area; | |
207 | // Left side | |
758a629f DV |
208 | createClipDiv({ |
209 | x:0, y:0, | |
210 | w:plotArea.x, | |
211 | h:this.height | |
212 | }); | |
213 | ||
920208fb | 214 | // Top |
758a629f DV |
215 | createClipDiv({ |
216 | x: plotArea.x, y: 0, | |
217 | w: this.width - plotArea.x, | |
218 | h: plotArea.y | |
219 | }); | |
220 | ||
920208fb | 221 | // Right side |
758a629f DV |
222 | createClipDiv({ |
223 | x: plotArea.x + plotArea.w, y: 0, | |
224 | w: this.width-plotArea.x - plotArea.w, | |
225 | h: this.height | |
226 | }); | |
227 | ||
920208fb | 228 | // Bottom |
758a629f DV |
229 | createClipDiv({ |
230 | x: plotArea.x, | |
231 | y: plotArea.y + plotArea.h, | |
232 | w: this.width - plotArea.x, | |
233 | h: this.height - plotArea.h - plotArea.y | |
234 | }); | |
235 | }; | |
fbe31dc8 | 236 | |
fbe31dc8 | 237 | |
ccb0001c | 238 | /** |
8722284b RK |
239 | * Returns a predicate to be used with an iterator, which will |
240 | * iterate over points appropriately, depending on whether | |
241 | * connectSeparatedPoints is true. When it's false, the predicate will | |
242 | * skip over points with missing yVals. | |
ccb0001c | 243 | */ |
8722284b | 244 | DygraphCanvasRenderer._getIteratorPredicate = function(connectSeparatedPoints) { |
42a9ebb8 DV |
245 | return connectSeparatedPoints ? |
246 | DygraphCanvasRenderer._predicateThatSkipsEmptyPoints : | |
247 | null; | |
0f20de1c | 248 | }; |
8722284b RK |
249 | |
250 | DygraphCanvasRenderer._predicateThatSkipsEmptyPoints = | |
0f20de1c DV |
251 | function(array, idx) { |
252 | return array[idx].yval !== null; | |
253 | }; | |
04c104d7 | 254 | |
9f6db80e | 255 | /** |
38e3d209 DV |
256 | * Draws a line with the styles passed in and calls all the drawPointCallbacks. |
257 | * @param {Object} e The dictionary passed to the plotter function. | |
9f6db80e DV |
258 | * @private |
259 | */ | |
38e3d209 DV |
260 | DygraphCanvasRenderer._drawStyledLine = function(e, |
261 | color, strokeWidth, strokePattern, drawPoints, | |
5469113b | 262 | drawPointCallback, pointSize) { |
38e3d209 | 263 | var g = e.dygraph; |
99a77a04 | 264 | // TODO(konigsberg): Compute attributes outside this method call. |
0ce5b19b | 265 | var stepPlot = g.getOption("stepPlot", e.setName); |
2f56cd46 | 266 | |
857a6931 KW |
267 | if (!Dygraph.isArrayLike(strokePattern)) { |
268 | strokePattern = null; | |
269 | } | |
270 | ||
38e3d209 DV |
271 | var drawGapPoints = g.getOption('drawGapEdgePoints', e.setName); |
272 | ||
273 | var points = e.points; | |
a12a78ae | 274 | var iter = Dygraph.createIterator(points, 0, points.length, |
9f6db80e | 275 | DygraphCanvasRenderer._getIteratorPredicate( |
38e3d209 | 276 | g.getOption("connectSeparatedPoints"))); // TODO(danvk): per-series? |
7d1afbb9 | 277 | |
fb63bf1b DV |
278 | var stroking = strokePattern && (strokePattern.length >= 2); |
279 | ||
38e3d209 | 280 | var ctx = e.drawingContext; |
0140347d | 281 | ctx.save(); |
fb63bf1b DV |
282 | if (stroking) { |
283 | ctx.installPattern(strokePattern); | |
b843b52c | 284 | } |
fb63bf1b | 285 | |
38e3d209 DV |
286 | var pointsOnLine = DygraphCanvasRenderer._drawSeries( |
287 | e, iter, strokeWidth, pointSize, drawPoints, drawGapPoints, stepPlot, color); | |
288 | DygraphCanvasRenderer._drawPointsOnLine( | |
289 | e, pointsOnLine, drawPointCallback, color, pointSize); | |
31f8e58b | 290 | |
fb63bf1b DV |
291 | if (stroking) { |
292 | ctx.uninstallPattern(); | |
293 | } | |
b843b52c | 294 | |
fb63bf1b | 295 | ctx.restore(); |
31f8e58b RK |
296 | }; |
297 | ||
38e3d209 DV |
298 | /** |
299 | * This does the actual drawing of lines on the canvas, for just one series. | |
300 | * Returns a list of [canvasx, canvasy] pairs for points for which a | |
301 | * drawPointCallback should be fired. These include isolated points, or all | |
302 | * points if drawPoints=true. | |
303 | * @param {Object} e The dictionary passed to the plotter function. | |
304 | * @private | |
305 | */ | |
306 | DygraphCanvasRenderer._drawSeries = function(e, | |
307 | iter, strokeWidth, pointSize, drawPoints, drawGapPoints, stepPlot, color) { | |
31f8e58b | 308 | |
31f8e58b RK |
309 | var prevCanvasX = null; |
310 | var prevCanvasY = null; | |
311 | var nextCanvasY = null; | |
312 | var isIsolated; // true if this point is isolated (no line segments) | |
313 | var point; // the point being processed in the while loop | |
b843b52c | 314 | var pointsOnLine = []; // Array of [canvasx, canvasy] pairs. |
31f8e58b RK |
315 | var first = true; // the first cycle through the while loop |
316 | ||
38e3d209 | 317 | var ctx = e.drawingContext; |
0140347d DV |
318 | ctx.beginPath(); |
319 | ctx.strokeStyle = color; | |
320 | ctx.lineWidth = strokeWidth; | |
31f8e58b | 321 | |
239454e2 | 322 | // NOTE: we break the iterator's encapsulation here for about a 25% speedup. |
c560c848 DV |
323 | var arr = iter.array_; |
324 | var limit = iter.end_; | |
325 | var predicate = iter.predicate_; | |
326 | ||
327 | for (var i = iter.start_; i < limit; i++) { | |
328 | point = arr[i]; | |
329 | if (predicate) { | |
330 | while (i < limit && !predicate(arr, i)) { | |
0f20de1c DV |
331 | i++; |
332 | } | |
c560c848 DV |
333 | if (i == limit) break; |
334 | point = arr[i]; | |
0f20de1c DV |
335 | } |
336 | ||
b7ec6c55 PH |
337 | // FIXME: The 'canvasy != canvasy' test here catches NaN values but the test |
338 | // doesn't catch Infinity values. Could change this to | |
339 | // !isFinite(point.canvasy), but I assume it avoids isNaN for performance? | |
a02978e2 | 340 | if (point.canvasy === null || point.canvasy != point.canvasy) { |
31f8e58b | 341 | if (stepPlot && prevCanvasX !== null) { |
857a6931 | 342 | // Draw a horizontal line to the start of the missing data |
42a9ebb8 DV |
343 | ctx.moveTo(prevCanvasX, prevCanvasY); |
344 | ctx.lineTo(point.canvasx, prevCanvasY); | |
857a6931 | 345 | } |
31f8e58b | 346 | prevCanvasX = prevCanvasY = null; |
857a6931 | 347 | } else { |
0f20de1c DV |
348 | isIsolated = false; |
349 | if (drawGapPoints || !prevCanvasX) { | |
0f20de1c | 350 | iter.nextIdx_ = i; |
0cd1ad15 | 351 | iter.next(); |
82f9b10f | 352 | nextCanvasY = iter.hasNext ? iter.peek.canvasy : null; |
0f20de1c | 353 | |
0f20de1c DV |
354 | var isNextCanvasYNullOrNaN = nextCanvasY === null || |
355 | nextCanvasY != nextCanvasY; | |
356 | isIsolated = (!prevCanvasX && isNextCanvasYNullOrNaN); | |
357 | if (drawGapPoints) { | |
358 | // Also consider a point to be "isolated" if it's adjacent to a | |
359 | // null point, excluding the graph edges. | |
360 | if ((!first && !prevCanvasX) || | |
361 | (iter.hasNext && isNextCanvasYNullOrNaN)) { | |
362 | isIsolated = true; | |
363 | } | |
19b84fe7 KW |
364 | } |
365 | } | |
0f20de1c | 366 | |
31f8e58b | 367 | if (prevCanvasX !== null) { |
857a6931 | 368 | if (strokeWidth) { |
857a6931 | 369 | if (stepPlot) { |
0140347d DV |
370 | ctx.moveTo(prevCanvasX, prevCanvasY); |
371 | ctx.lineTo(point.canvasx, prevCanvasY); | |
857a6931 | 372 | } |
239454e2 | 373 | |
0140347d | 374 | ctx.lineTo(point.canvasx, point.canvasy); |
b843b52c | 375 | } |
9f636500 DV |
376 | } else { |
377 | ctx.moveTo(point.canvasx, point.canvasy); | |
b843b52c | 378 | } |
b843b52c | 379 | if (drawPoints || isIsolated) { |
b616fad1 | 380 | pointsOnLine.push([point.canvasx, point.canvasy, point.idx]); |
b843b52c | 381 | } |
31f8e58b RK |
382 | prevCanvasX = point.canvasx; |
383 | prevCanvasY = point.canvasy; | |
b843b52c | 384 | } |
7d1afbb9 | 385 | first = false; |
b843b52c | 386 | } |
0140347d | 387 | ctx.stroke(); |
31f8e58b | 388 | return pointsOnLine; |
857a6931 KW |
389 | }; |
390 | ||
38e3d209 DV |
391 | /** |
392 | * This fires the drawPointCallback functions, which draw dots on the points by | |
393 | * default. This gets used when the "drawPoints" option is set, or when there | |
394 | * are isolated points. | |
395 | * @param {Object} e The dictionary passed to the plotter function. | |
396 | * @private | |
397 | */ | |
398 | DygraphCanvasRenderer._drawPointsOnLine = function( | |
399 | e, pointsOnLine, drawPointCallback, color, pointSize) { | |
400 | var ctx = e.drawingContext; | |
401 | for (var idx = 0; idx < pointsOnLine.length; idx++) { | |
402 | var cb = pointsOnLine[idx]; | |
403 | ctx.save(); | |
404 | drawPointCallback( | |
ba697462 | 405 | e.dygraph, e.setName, ctx, cb[0], cb[1], color, pointSize, cb[2]); |
38e3d209 | 406 | ctx.restore(); |
857a6931 | 407 | } |
42a9ebb8 | 408 | }; |
ce49c2fa | 409 | |
6a1aa64f | 410 | /** |
38e3d209 | 411 | * Attaches canvas coordinates to the points array. |
758a629f | 412 | * @private |
6a1aa64f | 413 | */ |
38e3d209 | 414 | DygraphCanvasRenderer.prototype._updatePoints = function() { |
ff00d3e2 DV |
415 | // Update Points |
416 | // TODO(danvk): here | |
b843b52c RK |
417 | // |
418 | // TODO(bhs): this loop is a hot-spot for high-point-count charts. These | |
419 | // transformations can be pushed into the canvas via linear transformation | |
420 | // matrices. | |
e60234cd DV |
421 | // NOTE(danvk): this is trickier than it sounds at first. The transformation |
422 | // needs to be done before the .moveTo() and .lineTo() calls, but must be | |
423 | // undone before the .stroke() call to ensure that the stroke width is | |
424 | // unaffected. An alternative is to reduce the stroke width in the | |
425 | // transformed coordinate space, but you can't specify different values for | |
426 | // each dimension (as you can with .scale()). The speedup here is ~12%. | |
a12a78ae | 427 | var sets = this.layout.points; |
38e3d209 | 428 | for (var i = sets.length; i--;) { |
a12a78ae DV |
429 | var points = sets[i]; |
430 | for (var j = points.length; j--;) { | |
431 | var point = points[j]; | |
432 | point.canvasx = this.area.w * point.x + this.area.x; | |
433 | point.canvasy = this.area.h * point.y + this.area.y; | |
434 | } | |
6a1aa64f | 435 | } |
38e3d209 | 436 | }; |
6a1aa64f | 437 | |
38e3d209 DV |
438 | /** |
439 | * Add canvas Actually draw the lines chart, including error bars. | |
38e3d209 DV |
440 | * |
441 | * This function can only be called if DygraphLayout's points array has been | |
442 | * updated with canvas{x,y} attributes, i.e. by | |
443 | * DygraphCanvasRenderer._updatePoints. | |
48fc4786 RK |
444 | * |
445 | * @param {string=} opt_seriesName when specified, only that series will | |
34655aba RK |
446 | * be drawn. (This is used for expedited redrawing with highlightSeriesOpts) |
447 | * @param {CanvasRenderingContext2D} opt_ctx when specified, the drawing | |
448 | * context. However, lines are typically drawn on the object's | |
449 | * elementContext. | |
38e3d209 DV |
450 | * @private |
451 | */ | |
452 | DygraphCanvasRenderer.prototype._renderLineChart = function(opt_seriesName, opt_ctx) { | |
453 | var ctx = opt_ctx || this.elementContext; | |
38e3d209 | 454 | var i; |
6a834bbb | 455 | |
38e3d209 DV |
456 | var sets = this.layout.points; |
457 | var setNames = this.layout.setNames; | |
42a9ebb8 | 458 | var setName; |
38e3d209 DV |
459 | |
460 | this.colors = this.dygraph_.colorsMap_; | |
461 | ||
462 | // Determine which series have specialized plotters. | |
463 | var plotter_attr = this.attr_("plotter"); | |
464 | var plotters = plotter_attr; | |
465 | if (!Dygraph.isArrayLike(plotters)) { | |
466 | plotters = [plotters]; | |
80aaae18 DV |
467 | } |
468 | ||
38e3d209 DV |
469 | var setPlotters = {}; // series name -> plotter fn. |
470 | for (i = 0; i < setNames.length; i++) { | |
42a9ebb8 | 471 | setName = setNames[i]; |
38e3d209 DV |
472 | var setPlotter = this.attr_("plotter", setName); |
473 | if (setPlotter == plotter_attr) continue; // not specialized. | |
474 | ||
475 | setPlotters[setName] = setPlotter; | |
476 | } | |
477 | ||
478 | for (i = 0; i < plotters.length; i++) { | |
479 | var plotter = plotters[i]; | |
480 | var is_last = (i == plotters.length - 1); | |
481 | ||
482 | for (var j = 0; j < sets.length; j++) { | |
42a9ebb8 | 483 | setName = setNames[j]; |
4b2e41a4 | 484 | if (opt_seriesName && setName != opt_seriesName) continue; |
38e3d209 DV |
485 | |
486 | var points = sets[j]; | |
487 | ||
488 | // Only throw in the specialized plotters on the last iteration. | |
489 | var p = plotter; | |
490 | if (setName in setPlotters) { | |
491 | if (is_last) { | |
492 | p = setPlotters[setName]; | |
493 | } else { | |
494 | // Don't use the standard plotters in this case. | |
495 | continue; | |
496 | } | |
497 | } | |
498 | ||
499 | var color = this.colors[setName]; | |
500 | var strokeWidth = this.dygraph_.getOption("strokeWidth", setName); | |
501 | ||
502 | ctx.save(); | |
503 | ctx.strokeStyle = color; | |
504 | ctx.lineWidth = strokeWidth; | |
505 | p({ | |
506 | points: points, | |
507 | setName: setName, | |
508 | drawingContext: ctx, | |
509 | color: color, | |
510 | strokeWidth: strokeWidth, | |
511 | dygraph: this.dygraph_, | |
512 | axis: this.dygraph_.axisPropertiesForSeries(setName), | |
513 | plotArea: this.area, | |
514 | seriesIndex: j, | |
515 | seriesCount: sets.length, | |
3c080cd0 | 516 | singleSeriesName: opt_seriesName, |
38e3d209 DV |
517 | allSeriesPoints: sets |
518 | }); | |
519 | ctx.restore(); | |
520 | } | |
521 | } | |
522 | }; | |
523 | ||
524 | /** | |
525 | * Standard plotters. These may be used by clients via Dygraph.Plotters. | |
526 | * See comments there for more details. | |
527 | */ | |
528 | DygraphCanvasRenderer._Plotters = { | |
529 | linePlotter: function(e) { | |
530 | DygraphCanvasRenderer._linePlotter(e); | |
531 | }, | |
532 | ||
533 | fillPlotter: function(e) { | |
534 | DygraphCanvasRenderer._fillPlotter(e); | |
535 | }, | |
536 | ||
537 | errorPlotter: function(e) { | |
538 | DygraphCanvasRenderer._errorPlotter(e); | |
80aaae18 | 539 | } |
6a1aa64f | 540 | }; |
79253bd0 | 541 | |
01a14b85 | 542 | /** |
38e3d209 DV |
543 | * Plotter which draws the central lines for a series. |
544 | * @private | |
545 | */ | |
546 | DygraphCanvasRenderer._linePlotter = function(e) { | |
547 | var g = e.dygraph; | |
548 | var setName = e.setName; | |
549 | var strokeWidth = e.strokeWidth; | |
550 | ||
551 | // TODO(danvk): Check if there's any performance impact of just calling | |
552 | // getOption() inside of _drawStyledLine. Passing in so many parameters makes | |
553 | // this code a bit nasty. | |
554 | var borderWidth = g.getOption("strokeBorderWidth", setName); | |
555 | var drawPointCallback = g.getOption("drawPointCallback", setName) || | |
556 | Dygraph.Circles.DEFAULT; | |
557 | var strokePattern = g.getOption("strokePattern", setName); | |
558 | var drawPoints = g.getOption("drawPoints", setName); | |
559 | var pointSize = g.getOption("pointSize", setName); | |
560 | ||
561 | if (borderWidth && strokeWidth) { | |
562 | DygraphCanvasRenderer._drawStyledLine(e, | |
563 | g.getOption("strokeBorderColor", setName), | |
564 | strokeWidth + 2 * borderWidth, | |
565 | strokePattern, | |
566 | drawPoints, | |
567 | drawPointCallback, | |
568 | pointSize | |
569 | ); | |
570 | } | |
571 | ||
572 | DygraphCanvasRenderer._drawStyledLine(e, | |
573 | e.color, | |
574 | strokeWidth, | |
575 | strokePattern, | |
576 | drawPoints, | |
577 | drawPointCallback, | |
578 | pointSize | |
579 | ); | |
42a9ebb8 | 580 | }; |
38e3d209 DV |
581 | |
582 | /** | |
01a14b85 DV |
583 | * Draws the shaded error bars/confidence intervals for each series. |
584 | * This happens before the center lines are drawn, since the center lines | |
585 | * need to be drawn on top of the error bars for all series. | |
01a14b85 DV |
586 | * @private |
587 | */ | |
38e3d209 DV |
588 | DygraphCanvasRenderer._errorPlotter = function(e) { |
589 | var g = e.dygraph; | |
e2d8db3a | 590 | var setName = e.setName; |
38e3d209 DV |
591 | var errorBars = g.getOption("errorBars") || g.getOption("customBars"); |
592 | if (!errorBars) return; | |
593 | ||
e2d8db3a | 594 | var fillGraph = g.getOption("fillGraph", setName); |
38e3d209 DV |
595 | if (fillGraph) { |
596 | g.warn("Can't use fillGraph option with error bars"); | |
597 | } | |
6a6439da | 598 | |
38e3d209 DV |
599 | var ctx = e.drawingContext; |
600 | var color = e.color; | |
601 | var fillAlpha = g.getOption('fillAlpha', setName); | |
0ce5b19b | 602 | var stepPlot = g.getOption("stepPlot", setName); |
38e3d209 | 603 | var points = e.points; |
6a6439da | 604 | |
38e3d209 DV |
605 | var iter = Dygraph.createIterator(points, 0, points.length, |
606 | DygraphCanvasRenderer._getIteratorPredicate( | |
607 | g.getOption("connectSeparatedPoints"))); | |
6a6439da | 608 | |
38e3d209 | 609 | var newYs; |
6a6439da | 610 | |
38e3d209 DV |
611 | // setup graphics context |
612 | var prevX = NaN; | |
613 | var prevY = NaN; | |
614 | var prevYs = [-1, -1]; | |
38e3d209 | 615 | // should be same color as the lines but only 15% opaque. |
a96b8ba3 | 616 | var rgb = new RGBColorParser(color); |
38e3d209 DV |
617 | var err_color = |
618 | 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + fillAlpha + ')'; | |
619 | ctx.fillStyle = err_color; | |
620 | ctx.beginPath(); | |
cf89eeed DV |
621 | |
622 | var isNullUndefinedOrNaN = function(x) { | |
623 | return (x === null || | |
624 | x === undefined || | |
625 | isNaN(x)); | |
626 | }; | |
627 | ||
38e3d209 DV |
628 | while (iter.hasNext) { |
629 | var point = iter.next(); | |
cf89eeed DV |
630 | if ((!stepPlot && isNullUndefinedOrNaN(point.y)) || |
631 | (stepPlot && !isNaN(prevY) && isNullUndefinedOrNaN(prevY))) { | |
38e3d209 DV |
632 | prevX = NaN; |
633 | continue; | |
634 | } | |
6a6439da | 635 | |
38e3d209 DV |
636 | if (stepPlot) { |
637 | newYs = [ point.y_bottom, point.y_top ]; | |
638 | prevY = point.y; | |
639 | } else { | |
640 | newYs = [ point.y_bottom, point.y_top ]; | |
641 | } | |
642 | newYs[0] = e.plotArea.h * newYs[0] + e.plotArea.y; | |
643 | newYs[1] = e.plotArea.h * newYs[1] + e.plotArea.y; | |
644 | if (!isNaN(prevX)) { | |
a5701188 | 645 | if (stepPlot) { |
38e3d209 | 646 | ctx.moveTo(prevX, prevYs[0]); |
82dd90c5 | 647 | ctx.lineTo(point.canvasx, prevYs[0]); |
648 | ctx.lineTo(point.canvasx, prevYs[1]); | |
38e3d209 | 649 | } else { |
82dd90c5 | 650 | ctx.moveTo(prevX, prevYs[0]); |
651 | ctx.lineTo(point.canvasx, newYs[0]); | |
652 | ctx.lineTo(point.canvasx, newYs[1]); | |
6a6439da | 653 | } |
82dd90c5 | 654 | ctx.lineTo(prevX, prevYs[1]); |
38e3d209 | 655 | ctx.closePath(); |
6a6439da | 656 | } |
38e3d209 DV |
657 | prevYs = newYs; |
658 | prevX = point.canvasx; | |
6a6439da | 659 | } |
38e3d209 | 660 | ctx.fill(); |
42a9ebb8 | 661 | }; |
6a6439da | 662 | |
79253bd0 | 663 | /** |
01a14b85 DV |
664 | * Draws the shaded regions when "fillGraph" is set. Not to be confused with |
665 | * error bars. | |
666 | * | |
38e3d209 DV |
667 | * For stacked charts, it's more convenient to handle all the series |
668 | * simultaneously. So this plotter plots all the points on the first series | |
669 | * it's asked to draw, then ignores all the other series. | |
670 | * | |
01a14b85 DV |
671 | * @private |
672 | */ | |
38e3d209 | 673 | DygraphCanvasRenderer._fillPlotter = function(e) { |
3c080cd0 KW |
674 | // Skip if we're drawing a single series for interactive highlight overlay. |
675 | if (e.singleSeriesName) return; | |
676 | ||
38e3d209 DV |
677 | // We'll handle all the series at once, not one-by-one. |
678 | if (e.seriesIndex !== 0) return; | |
679 | ||
e2d8db3a | 680 | var g = e.dygraph; |
38e3d209 | 681 | var setNames = g.getLabels().slice(1); // remove x-axis |
e2d8db3a | 682 | |
38e3d209 DV |
683 | // getLabels() includes names for invisible series, which are not included in |
684 | // allSeriesPoints. We remove those to make the two match. | |
685 | // TODO(danvk): provide a simpler way to get this information. | |
686 | for (var i = setNames.length; i >= 0; i--) { | |
687 | if (!g.visibility()[i]) setNames.splice(i, 1); | |
688 | } | |
689 | ||
e2d8db3a DV |
690 | var anySeriesFilled = (function() { |
691 | for (var i = 0; i < setNames.length; i++) { | |
692 | if (g.getOption("fillGraph", setNames[i])) return true; | |
693 | } | |
694 | return false; | |
695 | })(); | |
696 | ||
697 | if (!anySeriesFilled) return; | |
698 | ||
699 | var ctx = e.drawingContext; | |
700 | var area = e.plotArea; | |
701 | var sets = e.allSeriesPoints; | |
702 | var setCount = sets.length; | |
703 | ||
38e3d209 | 704 | var fillAlpha = g.getOption('fillAlpha'); |
38e3d209 DV |
705 | var stackedGraph = g.getOption("stackedGraph"); |
706 | var colors = g.getColors(); | |
01a14b85 | 707 | |
30a5cfc6 KW |
708 | // For stacked graphs, track the baseline for filling. |
709 | // | |
710 | // The filled areas below graph lines are trapezoids with two | |
711 | // vertical edges. The top edge is the line segment being drawn, and | |
712 | // the baseline is the bottom edge. Each baseline corresponds to the | |
713 | // top line segment from the previous stacked line. In the case of | |
714 | // step plots, the trapezoids are rectangles. | |
715 | var baseline = {}; | |
01a14b85 | 716 | var currBaseline; |
104d87c5 | 717 | var prevStepPlot; // for different line drawing modes (line/step) per series |
01a14b85 DV |
718 | |
719 | // process sets in reverse order (needed for stacked graphs) | |
9e85a8f4 DV |
720 | for (var setIdx = setCount - 1; setIdx >= 0; setIdx--) { |
721 | var setName = setNames[setIdx]; | |
e2d8db3a | 722 | if (!g.getOption('fillGraph', setName)) continue; |
104d87c5 | 723 | |
724 | var stepPlot = g.getOption('stepPlot', setName); | |
38e3d209 DV |
725 | var color = colors[setIdx]; |
726 | var axis = g.axisPropertiesForSeries(setName); | |
01a14b85 DV |
727 | var axisY = 1.0 + axis.minyval * axis.yscale; |
728 | if (axisY < 0.0) axisY = 0.0; | |
729 | else if (axisY > 1.0) axisY = 1.0; | |
38e3d209 | 730 | axisY = area.h * axisY + area.y; |
01a14b85 | 731 | |
38e3d209 | 732 | var points = sets[setIdx]; |
9e85a8f4 | 733 | var iter = Dygraph.createIterator(points, 0, points.length, |
01a14b85 | 734 | DygraphCanvasRenderer._getIteratorPredicate( |
38e3d209 | 735 | g.getOption("connectSeparatedPoints"))); |
01a14b85 DV |
736 | |
737 | // setup graphics context | |
738 | var prevX = NaN; | |
739 | var prevYs = [-1, -1]; | |
740 | var newYs; | |
01a14b85 | 741 | // should be same color as the lines but only 15% opaque. |
a96b8ba3 | 742 | var rgb = new RGBColorParser(color); |
01a14b85 DV |
743 | var err_color = |
744 | 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + fillAlpha + ')'; | |
745 | ctx.fillStyle = err_color; | |
746 | ctx.beginPath(); | |
12b879f4 DV |
747 | var last_x, is_first = true; |
748 | while (iter.hasNext) { | |
01a14b85 | 749 | var point = iter.next(); |
16febe6b DV |
750 | if (!Dygraph.isOK(point.y)) { |
751 | prevX = NaN; | |
30a5cfc6 KW |
752 | if (point.y_stacked !== null && !isNaN(point.y_stacked)) { |
753 | baseline[point.canvasx] = area.h * point.y_stacked + area.y; | |
754 | } | |
16febe6b DV |
755 | continue; |
756 | } | |
757 | if (stackedGraph) { | |
12b879f4 DV |
758 | if (!is_first && last_x == point.xval) { |
759 | continue; | |
760 | } else { | |
761 | is_first = false; | |
762 | last_x = point.xval; | |
763 | } | |
764 | ||
16febe6b DV |
765 | currBaseline = baseline[point.canvasx]; |
766 | var lastY; | |
767 | if (currBaseline === undefined) { | |
768 | lastY = axisY; | |
769 | } else { | |
104d87c5 | 770 | if(prevStepPlot) { |
16febe6b | 771 | lastY = currBaseline[0]; |
01a14b85 | 772 | } else { |
16febe6b | 773 | lastY = currBaseline; |
01a14b85 | 774 | } |
16febe6b DV |
775 | } |
776 | newYs = [ point.canvasy, lastY ]; | |
01a14b85 | 777 | |
16febe6b DV |
778 | if(stepPlot) { |
779 | // Step plots must keep track of the top and bottom of | |
780 | // the baseline at each point. | |
781 | if(prevYs[0] === -1) { | |
782 | baseline[point.canvasx] = [ point.canvasy, axisY ]; | |
01a14b85 | 783 | } else { |
16febe6b | 784 | baseline[point.canvasx] = [ point.canvasy, prevYs[0] ]; |
01a14b85 | 785 | } |
01a14b85 | 786 | } else { |
16febe6b | 787 | baseline[point.canvasx] = point.canvasy; |
01a14b85 | 788 | } |
01a14b85 | 789 | |
16febe6b DV |
790 | } else { |
791 | newYs = [ point.canvasy, axisY ]; | |
792 | } | |
793 | if (!isNaN(prevX)) { | |
794 | ctx.moveTo(prevX, prevYs[0]); | |
104d87c5 | 795 | |
796 | // Move to top fill point | |
16febe6b DV |
797 | if (stepPlot) { |
798 | ctx.lineTo(point.canvasx, prevYs[0]); | |
16febe6b DV |
799 | } else { |
800 | ctx.lineTo(point.canvasx, newYs[0]); | |
104d87c5 | 801 | } |
802 | // Move to bottom fill point | |
803 | if (prevStepPlot && currBaseline) { | |
804 | // Draw to the bottom of the baseline | |
805 | ctx.lineTo(point.canvasx, currBaseline[1]); | |
806 | } else { | |
16febe6b | 807 | ctx.lineTo(point.canvasx, newYs[1]); |
01a14b85 | 808 | } |
16febe6b DV |
809 | |
810 | ctx.lineTo(prevX, prevYs[1]); | |
811 | ctx.closePath(); | |
01a14b85 | 812 | } |
16febe6b DV |
813 | prevYs = newYs; |
814 | prevX = point.canvasx; | |
01a14b85 | 815 | } |
104d87c5 | 816 | prevStepPlot = stepPlot; |
01a14b85 DV |
817 | ctx.fill(); |
818 | } | |
819 | }; |