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6a1aa64f DV |
1 | // Copyright 2006 Dan Vanderkam (danvdk@gmail.com) |
2 | // All Rights Reserved. | |
3 | ||
4 | /** | |
3df0ccf0 DV |
5 | * @fileoverview Based on PlotKit, but modified to meet the needs of dygraphs. |
6 | * In particular, support for: | |
0abfbd7e | 7 | * - grid overlays |
3df0ccf0 DV |
8 | * - error bars |
9 | * - dygraphs attribute system | |
ad1798c2 DV |
10 | * |
11 | * High level overview of classes: | |
12 | * | |
13 | * - DygraphLayout | |
14 | * This contains all the data to be charted. | |
15 | * It uses data coordinates, but also records the chart range (in data | |
16 | * coordinates) and hence is able to calculate percentage positions ('In | |
17 | * this view, Point A lies 25% down the x-axis.') | |
18 | * Two things that it does not do are: | |
19 | * 1. Record pixel coordinates for anything. | |
20 | * 2. (oddly) determine anything about the layout of chart elements. | |
21 | * The naming is a vestige of Dygraph's original PlotKit roots. | |
22 | * | |
23 | * - DygraphCanvasRenderer | |
24 | * This class determines the charting area (in pixel coordinates), maps the | |
25 | * percentage coordinates in the DygraphLayout to pixels and draws them. | |
26 | * It's also responsible for creating chart DOM elements, i.e. annotations, | |
27 | * tick mark labels, the title and the x/y-axis labels. | |
6a1aa64f DV |
28 | */ |
29 | ||
6a1aa64f | 30 | /** |
3df0ccf0 | 31 | * Creates a new DygraphLayout object. |
285a6bda | 32 | * @return {Object} The DygraphLayout object |
6a1aa64f | 33 | */ |
b2c9222a | 34 | DygraphLayout = function(dygraph) { |
efe0829a | 35 | this.dygraph_ = dygraph; |
efe0829a | 36 | this.datasets = new Array(); |
937029df | 37 | this.annotations = new Array(); |
b2c9222a DV |
38 | this.yAxes_ = null; |
39 | ||
40 | // TODO(danvk): it's odd that xTicks_ and yTicks_ are inputs, but xticks and | |
41 | // yticks are outputs. Clean this up. | |
42 | this.xTicks_ = null; | |
43 | this.yTicks_ = null; | |
6a1aa64f | 44 | }; |
efe0829a DV |
45 | |
46 | DygraphLayout.prototype.attr_ = function(name) { | |
47 | return this.dygraph_.attr_(name); | |
48 | }; | |
49 | ||
50 | DygraphLayout.prototype.addDataset = function(setname, set_xy) { | |
51 | this.datasets[setname] = set_xy; | |
52 | }; | |
53 | ||
5c528fa2 DV |
54 | DygraphLayout.prototype.setAnnotations = function(ann) { |
55 | // The Dygraph object's annotations aren't parsed. We parse them here and | |
70a50f94 | 56 | // save a copy. If there is no parser, then the user must be using raw format. |
973e2b79 | 57 | this.annotations = []; |
70a50f94 | 58 | var parse = this.attr_('xValueParser') || function(x) { return x; }; |
5c528fa2 DV |
59 | for (var i = 0; i < ann.length; i++) { |
60 | var a = {}; | |
a685723c | 61 | if (!ann[i].xval && !ann[i].x) { |
5c528fa2 DV |
62 | this.dygraph_.error("Annotations must have an 'x' property"); |
63 | return; | |
64 | } | |
ce5e8d36 | 65 | if (ann[i].icon && |
33030f33 DV |
66 | !(ann[i].hasOwnProperty('width') && |
67 | ann[i].hasOwnProperty('height'))) { | |
68 | this.dygraph_.error("Must set width and height when setting " + | |
ce5e8d36 DV |
69 | "annotation.icon property"); |
70 | return; | |
71 | } | |
5c528fa2 | 72 | Dygraph.update(a, ann[i]); |
a685723c | 73 | if (!a.xval) a.xval = parse(a.x); |
5c528fa2 | 74 | this.annotations.push(a); |
ce49c2fa | 75 | } |
ce49c2fa DV |
76 | }; |
77 | ||
b2c9222a DV |
78 | DygraphLayout.prototype.setXTicks = function(xTicks) { |
79 | this.xTicks_ = xTicks; | |
80 | }; | |
81 | ||
82 | // TODO(danvk): add this to the Dygraph object's API or move it into Layout. | |
83 | DygraphLayout.prototype.setYAxes = function (yAxes) { | |
84 | this.yAxes_ = yAxes; | |
85 | }; | |
86 | ||
87 | DygraphLayout.prototype.setDateWindow = function(dateWindow) { | |
88 | this.dateWindow_ = dateWindow; | |
89 | }; | |
90 | ||
efe0829a DV |
91 | DygraphLayout.prototype.evaluate = function() { |
92 | this._evaluateLimits(); | |
93 | this._evaluateLineCharts(); | |
94 | this._evaluateLineTicks(); | |
ce49c2fa | 95 | this._evaluateAnnotations(); |
efe0829a DV |
96 | }; |
97 | ||
98 | DygraphLayout.prototype._evaluateLimits = function() { | |
99 | this.minxval = this.maxxval = null; | |
b2c9222a DV |
100 | if (this.dateWindow_) { |
101 | this.minxval = this.dateWindow_[0]; | |
102 | this.maxxval = this.dateWindow_[1]; | |
f6401bf6 DV |
103 | } else { |
104 | for (var name in this.datasets) { | |
105 | if (!this.datasets.hasOwnProperty(name)) continue; | |
106 | var series = this.datasets[name]; | |
48841144 NN |
107 | if (series.length > 1) { |
108 | var x1 = series[0][0]; | |
109 | if (!this.minxval || x1 < this.minxval) this.minxval = x1; | |
110 | ||
111 | var x2 = series[series.length - 1][0]; | |
112 | if (!this.maxxval || x2 > this.maxxval) this.maxxval = x2; | |
113 | } | |
f6401bf6 | 114 | } |
efe0829a DV |
115 | } |
116 | this.xrange = this.maxxval - this.minxval; | |
117 | this.xscale = (this.xrange != 0 ? 1/this.xrange : 1.0); | |
118 | ||
b2c9222a DV |
119 | for (var i = 0; i < this.yAxes_.length; i++) { |
120 | var axis = this.yAxes_[i]; | |
26ca7938 DV |
121 | axis.minyval = axis.computedValueRange[0]; |
122 | axis.maxyval = axis.computedValueRange[1]; | |
ea4942ed DV |
123 | axis.yrange = axis.maxyval - axis.minyval; |
124 | axis.yscale = (axis.yrange != 0 ? 1.0 / axis.yrange : 1.0); | |
ff022deb | 125 | |
c742293b RK |
126 | if (axis.g.attr_("logscale")) { |
127 | axis.ylogrange = Dygraph.log10(axis.maxyval) - Dygraph.log10(axis.minyval); | |
128 | axis.ylogscale = (axis.ylogrange != 0 ? 1.0 / axis.ylogrange : 1.0); | |
129 | if (!isFinite(axis.ylogrange) || isNaN(axis.ylogrange)) { | |
130 | axis.g.error('axis ' + i + ' of graph at ' + axis.g + | |
131 | ' can\'t be displayed in log scale for range [' + | |
132 | axis.minyval + ' - ' + axis.maxyval + ']'); | |
133 | } | |
d03e78ed | 134 | } |
ea4942ed | 135 | } |
efe0829a DV |
136 | }; |
137 | ||
138 | DygraphLayout.prototype._evaluateLineCharts = function() { | |
139 | // add all the rects | |
140 | this.points = new Array(); | |
141 | for (var setName in this.datasets) { | |
85b99f0b DV |
142 | if (!this.datasets.hasOwnProperty(setName)) continue; |
143 | ||
144 | var dataset = this.datasets[setName]; | |
b2c9222a | 145 | var axis = this.dygraph_.axisPropertiesForSeries(setName); |
ea4942ed | 146 | |
85b99f0b DV |
147 | for (var j = 0; j < dataset.length; j++) { |
148 | var item = dataset[j]; | |
d03e78ed | 149 | |
3637724f | 150 | var yval; |
7d0e7a0d | 151 | if (axis.logscale) { |
0037b2a4 | 152 | yval = 1.0 - ((Dygraph.log10(parseFloat(item[1])) - Dygraph.log10(axis.minyval)) * axis.ylogscale); // really should just be yscale. |
ff022deb | 153 | } else { |
3637724f | 154 | yval = 1.0 - ((parseFloat(item[1]) - axis.minyval) * axis.yscale); |
ff022deb | 155 | } |
85b99f0b | 156 | var point = { |
ff00d3e2 | 157 | // TODO(danvk): here |
85b99f0b | 158 | x: ((parseFloat(item[0]) - this.minxval) * this.xscale), |
3637724f | 159 | y: yval, |
85b99f0b DV |
160 | xval: parseFloat(item[0]), |
161 | yval: parseFloat(item[1]), | |
162 | name: setName | |
163 | }; | |
164 | ||
1a26f3fb | 165 | this.points.push(point); |
85b99f0b | 166 | } |
efe0829a DV |
167 | } |
168 | }; | |
169 | ||
170 | DygraphLayout.prototype._evaluateLineTicks = function() { | |
171 | this.xticks = new Array(); | |
b2c9222a DV |
172 | for (var i = 0; i < this.xTicks_.length; i++) { |
173 | var tick = this.xTicks_[i]; | |
efe0829a DV |
174 | var label = tick.label; |
175 | var pos = this.xscale * (tick.v - this.minxval); | |
176 | if ((pos >= 0.0) && (pos <= 1.0)) { | |
177 | this.xticks.push([pos, label]); | |
178 | } | |
179 | } | |
180 | ||
181 | this.yticks = new Array(); | |
b2c9222a DV |
182 | for (var i = 0; i < this.yAxes_.length; i++ ) { |
183 | var axis = this.yAxes_[i]; | |
67076b22 DV |
184 | for (var j = 0; j < axis.ticks.length; j++) { |
185 | var tick = axis.ticks[j]; | |
186 | var label = tick.label; | |
ff022deb | 187 | var pos = this.dygraph_.toPercentYCoord(tick.v, i); |
67076b22 | 188 | if ((pos >= 0.0) && (pos <= 1.0)) { |
9012dd21 | 189 | this.yticks.push([i, pos, label]); |
67076b22 | 190 | } |
efe0829a DV |
191 | } |
192 | } | |
193 | }; | |
194 | ||
6a1aa64f DV |
195 | |
196 | /** | |
197 | * Behaves the same way as PlotKit.Layout, but also copies the errors | |
198 | * @private | |
199 | */ | |
285a6bda | 200 | DygraphLayout.prototype.evaluateWithError = function() { |
6a1aa64f | 201 | this.evaluate(); |
b2c9222a | 202 | if (!(this.attr_('errorBars') || this.attr_('customBars'))) return; |
6a1aa64f DV |
203 | |
204 | // Copy over the error terms | |
205 | var i = 0; // index in this.points | |
206 | for (var setName in this.datasets) { | |
85b99f0b DV |
207 | if (!this.datasets.hasOwnProperty(setName)) continue; |
208 | var j = 0; | |
209 | var dataset = this.datasets[setName]; | |
210 | for (var j = 0; j < dataset.length; j++, i++) { | |
211 | var item = dataset[j]; | |
212 | var xv = parseFloat(item[0]); | |
213 | var yv = parseFloat(item[1]); | |
214 | ||
215 | if (xv == this.points[i].xval && | |
216 | yv == this.points[i].yval) { | |
217 | this.points[i].errorMinus = parseFloat(item[2]); | |
218 | this.points[i].errorPlus = parseFloat(item[3]); | |
219 | } | |
220 | } | |
6a1aa64f DV |
221 | } |
222 | }; | |
223 | ||
ce49c2fa DV |
224 | DygraphLayout.prototype._evaluateAnnotations = function() { |
225 | // Add the annotations to the point to which they belong. | |
226 | // Make a map from (setName, xval) to annotation for quick lookups. | |
227 | var annotations = {}; | |
228 | for (var i = 0; i < this.annotations.length; i++) { | |
229 | var a = this.annotations[i]; | |
230 | annotations[a.xval + "," + a.series] = a; | |
231 | } | |
232 | ||
233 | this.annotated_points = []; | |
234 | for (var i = 0; i < this.points.length; i++) { | |
235 | var p = this.points[i]; | |
236 | var k = p.xval + "," + p.name; | |
237 | if (k in annotations) { | |
238 | p.annotation = annotations[k]; | |
239 | this.annotated_points.push(p); | |
240 | } | |
241 | } | |
242 | }; | |
243 | ||
6a1aa64f DV |
244 | /** |
245 | * Convenience function to remove all the data sets from a graph | |
246 | */ | |
285a6bda | 247 | DygraphLayout.prototype.removeAllDatasets = function() { |
6a1aa64f DV |
248 | delete this.datasets; |
249 | this.datasets = new Array(); | |
250 | }; | |
251 | ||
252 | /** | |
667d510b | 253 | * Return a copy of the point at the indicated index, with its yval unstacked. |
254 | * @param int index of point in layout_.points | |
255 | */ | |
8c03ba63 | 256 | DygraphLayout.prototype.unstackPointAtIndex = function(idx) { |
667d510b | 257 | var point = this.points[idx]; |
258 | ||
259 | // Clone the point since we modify it | |
260 | var unstackedPoint = {}; | |
261 | for (var i in point) { | |
262 | unstackedPoint[i] = point[i]; | |
263 | } | |
264 | ||
265 | if (!this.attr_("stackedGraph")) { | |
266 | return unstackedPoint; | |
267 | } | |
268 | ||
269 | // The unstacked yval is equal to the current yval minus the yval of the | |
270 | // next point at the same xval. | |
271 | for (var i = idx+1; i < this.points.length; i++) { | |
272 | if (this.points[i].xval == point.xval) { | |
273 | unstackedPoint.yval -= this.points[i].yval; | |
274 | break; | |
275 | } | |
276 | } | |
277 | ||
278 | return unstackedPoint; | |
279 | } | |
280 | ||
6a1aa64f | 281 | /** |
423f5ed3 DV |
282 | * The DygraphCanvasRenderer class does the actual rendering of the chart onto |
283 | * a canvas. It's based on PlotKit.CanvasRenderer. | |
6a1aa64f | 284 | * @param {Object} element The canvas to attach to |
2cf95fff RK |
285 | * @param {Object} elementContext The 2d context of the canvas (injected so it |
286 | * can be mocked for testing.) | |
285a6bda | 287 | * @param {Layout} layout The DygraphLayout object for this graph. |
6a1aa64f | 288 | */ |
423f5ed3 | 289 | DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) { |
9317362d | 290 | this.dygraph_ = dygraph; |
fbe31dc8 | 291 | |
fbe31dc8 | 292 | this.layout = layout; |
b0c3b730 | 293 | this.element = element; |
2cf95fff | 294 | this.elementContext = elementContext; |
fbe31dc8 DV |
295 | this.container = this.element.parentNode; |
296 | ||
fbe31dc8 DV |
297 | this.height = this.element.height; |
298 | this.width = this.element.width; | |
299 | ||
300 | // --- check whether everything is ok before we return | |
301 | if (!this.isIE && !(DygraphCanvasRenderer.isSupported(this.element))) | |
302 | throw "Canvas is not supported."; | |
303 | ||
304 | // internal state | |
305 | this.xlabels = new Array(); | |
306 | this.ylabels = new Array(); | |
ce49c2fa | 307 | this.annotations = new Array(); |
ad1798c2 | 308 | this.chartLabels = {}; |
fbe31dc8 | 309 | |
423f5ed3 DV |
310 | this.area = this.computeArea_(); |
311 | this.container.style.position = "relative"; | |
312 | this.container.style.width = this.width + "px"; | |
313 | ||
314 | // Set up a clipping area for the canvas (and the interaction canvas). | |
315 | // This ensures that we don't overdraw. | |
316 | var ctx = this.dygraph_.canvas_ctx_; | |
317 | ctx.beginPath(); | |
318 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
319 | ctx.clip(); | |
320 | ||
321 | ctx = this.dygraph_.hidden_ctx_; | |
322 | ctx.beginPath(); | |
323 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
324 | ctx.clip(); | |
325 | }; | |
326 | ||
327 | DygraphCanvasRenderer.prototype.attr_ = function(x) { | |
328 | return this.dygraph_.attr_(x); | |
329 | }; | |
330 | ||
331 | // Compute the box which the chart should be drawn in. This is the canvas's | |
332 | // box, less space needed for axis and chart labels. | |
333 | DygraphCanvasRenderer.prototype.computeArea_ = function() { | |
334 | var area = { | |
9012dd21 | 335 | // TODO(danvk): per-axis setting. |
423f5ed3 | 336 | x: this.attr_('yAxisLabelWidth') + 2 * this.attr_('axisTickSize'), |
fbe31dc8 DV |
337 | y: 0 |
338 | }; | |
423f5ed3 DV |
339 | area.w = this.width - area.x - this.attr_('rightGap'); |
340 | area.h = this.height - this.attr_('axisLabelFontSize') - | |
341 | 2 * this.attr_('axisTickSize'); | |
fbe31dc8 | 342 | |
26ca7938 DV |
343 | // Shrink the drawing area to accomodate additional y-axes. |
344 | if (this.dygraph_.numAxes() == 2) { | |
345 | // TODO(danvk): per-axis setting. | |
423f5ed3 | 346 | area.w -= (this.attr_('yAxisLabelWidth') + 2 * this.attr_('axisTickSize')); |
26ca7938 DV |
347 | } else if (this.dygraph_.numAxes() > 2) { |
348 | this.dygraph_.error("Only two y-axes are supported at this time. (Trying " + | |
34de8b76 | 349 | "to use " + this.dygraph_.numAxes() + ")"); |
26ca7938 DV |
350 | } |
351 | ||
ad1798c2 DV |
352 | // Add space for chart labels: title, xlabel and ylabel. |
353 | if (this.attr_('title')) { | |
423f5ed3 DV |
354 | area.h -= this.attr_('titleHeight'); |
355 | area.y += this.attr_('titleHeight'); | |
ad1798c2 DV |
356 | } |
357 | if (this.attr_('xlabel')) { | |
423f5ed3 | 358 | area.h -= this.attr_('xLabelHeight'); |
ad1798c2 DV |
359 | } |
360 | if (this.attr_('ylabel')) { | |
ca49434a DV |
361 | // It would make sense to shift the chart here to make room for the y-axis |
362 | // label, but the default yAxisLabelWidth is large enough that this results | |
363 | // in overly-padded charts. The y-axis label should fit fine. If it | |
364 | // doesn't, the yAxisLabelWidth option can be increased. | |
ad1798c2 DV |
365 | } |
366 | ||
423f5ed3 | 367 | return area; |
44c6bc29 DV |
368 | }; |
369 | ||
fbe31dc8 DV |
370 | DygraphCanvasRenderer.prototype.clear = function() { |
371 | if (this.isIE) { | |
372 | // VML takes a while to start up, so we just poll every this.IEDelay | |
373 | try { | |
374 | if (this.clearDelay) { | |
375 | this.clearDelay.cancel(); | |
376 | this.clearDelay = null; | |
377 | } | |
2cf95fff | 378 | var context = this.elementContext; |
fbe31dc8 DV |
379 | } |
380 | catch (e) { | |
76171648 | 381 | // TODO(danvk): this is broken, since MochiKit.Async is gone. |
fbe31dc8 DV |
382 | this.clearDelay = MochiKit.Async.wait(this.IEDelay); |
383 | this.clearDelay.addCallback(bind(this.clear, this)); | |
384 | return; | |
385 | } | |
386 | } | |
387 | ||
2cf95fff | 388 | var context = this.elementContext; |
fbe31dc8 DV |
389 | context.clearRect(0, 0, this.width, this.height); |
390 | ||
2160ed4a | 391 | for (var i = 0; i < this.xlabels.length; i++) { |
b0c3b730 | 392 | var el = this.xlabels[i]; |
b304aaec | 393 | if (el.parentNode) el.parentNode.removeChild(el); |
2160ed4a DV |
394 | } |
395 | for (var i = 0; i < this.ylabels.length; i++) { | |
b0c3b730 | 396 | var el = this.ylabels[i]; |
b304aaec | 397 | if (el.parentNode) el.parentNode.removeChild(el); |
2160ed4a | 398 | } |
ce49c2fa DV |
399 | for (var i = 0; i < this.annotations.length; i++) { |
400 | var el = this.annotations[i]; | |
b304aaec | 401 | if (el.parentNode) el.parentNode.removeChild(el); |
ce49c2fa | 402 | } |
ad1798c2 DV |
403 | for (var k in this.chartLabels) { |
404 | if (!this.chartLabels.hasOwnProperty(k)) continue; | |
405 | var el = this.chartLabels[k]; | |
406 | if (el.parentNode) el.parentNode.removeChild(el); | |
407 | } | |
fbe31dc8 DV |
408 | this.xlabels = new Array(); |
409 | this.ylabels = new Array(); | |
ce49c2fa | 410 | this.annotations = new Array(); |
ad1798c2 | 411 | this.chartLabels = {}; |
fbe31dc8 DV |
412 | }; |
413 | ||
414 | ||
415 | DygraphCanvasRenderer.isSupported = function(canvasName) { | |
416 | var canvas = null; | |
417 | try { | |
21d3323f | 418 | if (typeof(canvasName) == 'undefined' || canvasName == null) |
b0c3b730 | 419 | canvas = document.createElement("canvas"); |
fbe31dc8 | 420 | else |
b0c3b730 | 421 | canvas = canvasName; |
fbe31dc8 DV |
422 | var context = canvas.getContext("2d"); |
423 | } | |
424 | catch (e) { | |
425 | var ie = navigator.appVersion.match(/MSIE (\d\.\d)/); | |
426 | var opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1); | |
427 | if ((!ie) || (ie[1] < 6) || (opera)) | |
428 | return false; | |
429 | return true; | |
430 | } | |
431 | return true; | |
6a1aa64f | 432 | }; |
6a1aa64f DV |
433 | |
434 | /** | |
435 | * Draw an X/Y grid on top of the existing plot | |
436 | */ | |
285a6bda | 437 | DygraphCanvasRenderer.prototype.render = function() { |
528ce7e5 DV |
438 | // Draw the new X/Y grid. Lines appear crisper when pixels are rounded to |
439 | // half-integers. This prevents them from drawing in two rows/cols. | |
2cf95fff | 440 | var ctx = this.elementContext; |
528ce7e5 DV |
441 | function halfUp(x){return Math.round(x)+0.5}; |
442 | function halfDown(y){return Math.round(y)-0.5}; | |
e7746234 | 443 | |
423f5ed3 | 444 | if (this.attr_('underlayCallback')) { |
1e41bd2d DV |
445 | // NOTE: we pass the dygraph object to this callback twice to avoid breaking |
446 | // users who expect a deprecated form of this callback. | |
423f5ed3 | 447 | this.attr_('underlayCallback')(ctx, this.area, this.dygraph_, this.dygraph_); |
e7746234 EC |
448 | } |
449 | ||
423f5ed3 | 450 | if (this.attr_('drawYGrid')) { |
6a1aa64f DV |
451 | var ticks = this.layout.yticks; |
452 | ctx.save(); | |
423f5ed3 DV |
453 | ctx.strokeStyle = this.attr_('gridLineColor'); |
454 | ctx.lineWidth = this.attr_('axisLineWidth'); | |
6a1aa64f | 455 | for (var i = 0; i < ticks.length; i++) { |
880a574f DV |
456 | // TODO(danvk): allow secondary axes to draw a grid, too. |
457 | if (ticks[i][0] != 0) continue; | |
528ce7e5 DV |
458 | var x = halfUp(this.area.x); |
459 | var y = halfDown(this.area.y + ticks[i][1] * this.area.h); | |
6a1aa64f DV |
460 | ctx.beginPath(); |
461 | ctx.moveTo(x, y); | |
462 | ctx.lineTo(x + this.area.w, y); | |
463 | ctx.closePath(); | |
464 | ctx.stroke(); | |
465 | } | |
466 | } | |
467 | ||
423f5ed3 | 468 | if (this.attr_('drawXGrid')) { |
6a1aa64f DV |
469 | var ticks = this.layout.xticks; |
470 | ctx.save(); | |
423f5ed3 DV |
471 | ctx.strokeStyle = this.attr_('gridLineColor'); |
472 | ctx.lineWidth = this.attr_('axisLineWidth'); | |
6a1aa64f | 473 | for (var i=0; i<ticks.length; i++) { |
528ce7e5 DV |
474 | var x = halfUp(this.area.x + ticks[i][0] * this.area.w); |
475 | var y = halfDown(this.area.y + this.area.h); | |
6a1aa64f | 476 | ctx.beginPath(); |
880a574f | 477 | ctx.moveTo(x, y); |
6a1aa64f DV |
478 | ctx.lineTo(x, this.area.y); |
479 | ctx.closePath(); | |
480 | ctx.stroke(); | |
481 | } | |
482 | } | |
2ce09b19 DV |
483 | |
484 | // Do the ordinary rendering, as before | |
2ce09b19 | 485 | this._renderLineChart(); |
fbe31dc8 | 486 | this._renderAxis(); |
ad1798c2 | 487 | this._renderChartLabels(); |
ce49c2fa | 488 | this._renderAnnotations(); |
fbe31dc8 DV |
489 | }; |
490 | ||
491 | ||
492 | DygraphCanvasRenderer.prototype._renderAxis = function() { | |
423f5ed3 | 493 | if (!this.attr_('drawXAxis') && !this.attr_('drawYAxis')) return; |
fbe31dc8 | 494 | |
528ce7e5 DV |
495 | // Round pixels to half-integer boundaries for crisper drawing. |
496 | function halfUp(x){return Math.round(x)+0.5}; | |
497 | function halfDown(y){return Math.round(y)-0.5}; | |
498 | ||
2cf95fff | 499 | var context = this.elementContext; |
fbe31dc8 | 500 | |
34fedff8 | 501 | var labelStyle = { |
423f5ed3 DV |
502 | position: "absolute", |
503 | fontSize: this.attr_('axisLabelFontSize') + "px", | |
504 | zIndex: 10, | |
505 | color: this.attr_('axisLabelColor'), | |
506 | width: this.attr_('axisLabelWidth') + "px", | |
507 | overflow: "hidden" | |
34fedff8 DV |
508 | }; |
509 | var makeDiv = function(txt) { | |
510 | var div = document.createElement("div"); | |
511 | for (var name in labelStyle) { | |
85b99f0b DV |
512 | if (labelStyle.hasOwnProperty(name)) { |
513 | div.style[name] = labelStyle[name]; | |
514 | } | |
fbe31dc8 | 515 | } |
34fedff8 DV |
516 | div.appendChild(document.createTextNode(txt)); |
517 | return div; | |
fbe31dc8 DV |
518 | }; |
519 | ||
520 | // axis lines | |
521 | context.save(); | |
423f5ed3 DV |
522 | context.strokeStyle = this.attr_('axisLineColor'); |
523 | context.lineWidth = this.attr_('axisLineWidth'); | |
fbe31dc8 | 524 | |
423f5ed3 | 525 | if (this.attr_('drawYAxis')) { |
8b7a0cc3 | 526 | if (this.layout.yticks && this.layout.yticks.length > 0) { |
2160ed4a DV |
527 | for (var i = 0; i < this.layout.yticks.length; i++) { |
528 | var tick = this.layout.yticks[i]; | |
fbe31dc8 DV |
529 | if (typeof(tick) == "function") return; |
530 | var x = this.area.x; | |
880a574f DV |
531 | var sgn = 1; |
532 | if (tick[0] == 1) { // right-side y-axis | |
533 | x = this.area.x + this.area.w; | |
534 | sgn = -1; | |
9012dd21 DV |
535 | } |
536 | var y = this.area.y + tick[1] * this.area.h; | |
fbe31dc8 | 537 | context.beginPath(); |
528ce7e5 | 538 | context.moveTo(halfUp(x), halfDown(y)); |
423f5ed3 | 539 | context.lineTo(halfUp(x - sgn * this.attr_('axisTickSize'), halfDown(y)); |
fbe31dc8 DV |
540 | context.closePath(); |
541 | context.stroke(); | |
542 | ||
9012dd21 | 543 | var label = makeDiv(tick[2]); |
423f5ed3 | 544 | var top = (y - this.attr_('axisLabelFontSize') / 2); |
fbe31dc8 DV |
545 | if (top < 0) top = 0; |
546 | ||
423f5ed3 | 547 | if (top + this.attr_('axisLabelFontSize') + 3 > this.height) { |
fbe31dc8 DV |
548 | label.style.bottom = "0px"; |
549 | } else { | |
550 | label.style.top = top + "px"; | |
551 | } | |
9012dd21 | 552 | if (tick[0] == 0) { |
423f5ed3 | 553 | label.style.left = (this.area.x - this.attr_('yAxisLabelWidth') - this.attr_('axisTickSize')) + "px"; |
9012dd21 DV |
554 | label.style.textAlign = "right"; |
555 | } else if (tick[0] == 1) { | |
556 | label.style.left = (this.area.x + this.area.w + | |
423f5ed3 | 557 | this.attr_('axisTickSize')) + "px"; |
9012dd21 DV |
558 | label.style.textAlign = "left"; |
559 | } | |
423f5ed3 | 560 | label.style.width = this.attr_('yAxisLabelWidth') + "px"; |
b0c3b730 | 561 | this.container.appendChild(label); |
fbe31dc8 | 562 | this.ylabels.push(label); |
2160ed4a | 563 | } |
fbe31dc8 DV |
564 | |
565 | // The lowest tick on the y-axis often overlaps with the leftmost | |
566 | // tick on the x-axis. Shift the bottom tick up a little bit to | |
567 | // compensate if necessary. | |
568 | var bottomTick = this.ylabels[0]; | |
423f5ed3 | 569 | var fontSize = this.attr_('axisLabelFontSize'); |
fbe31dc8 DV |
570 | var bottom = parseInt(bottomTick.style.top) + fontSize; |
571 | if (bottom > this.height - fontSize) { | |
572 | bottomTick.style.top = (parseInt(bottomTick.style.top) - | |
573 | fontSize / 2) + "px"; | |
574 | } | |
575 | } | |
576 | ||
528ce7e5 | 577 | // draw a vertical line on the left to separate the chart from the labels. |
fbe31dc8 | 578 | context.beginPath(); |
528ce7e5 DV |
579 | context.moveTo(halfUp(this.area.x), halfDown(this.area.y)); |
580 | context.lineTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h)); | |
fbe31dc8 DV |
581 | context.closePath(); |
582 | context.stroke(); | |
c1dbeb10 | 583 | |
528ce7e5 | 584 | // if there's a secondary y-axis, draw a vertical line for that, too. |
c1dbeb10 DV |
585 | if (this.dygraph_.numAxes() == 2) { |
586 | context.beginPath(); | |
528ce7e5 DV |
587 | context.moveTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y)); |
588 | context.lineTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); | |
c1dbeb10 DV |
589 | context.closePath(); |
590 | context.stroke(); | |
591 | } | |
fbe31dc8 DV |
592 | } |
593 | ||
423f5ed3 | 594 | if (this.attr_('drawXAxis')) { |
fbe31dc8 | 595 | if (this.layout.xticks) { |
2160ed4a DV |
596 | for (var i = 0; i < this.layout.xticks.length; i++) { |
597 | var tick = this.layout.xticks[i]; | |
fbe31dc8 DV |
598 | if (typeof(dataset) == "function") return; |
599 | ||
600 | var x = this.area.x + tick[0] * this.area.w; | |
601 | var y = this.area.y + this.area.h; | |
602 | context.beginPath(); | |
528ce7e5 | 603 | context.moveTo(halfUp(x), halfDown(y)); |
423f5ed3 | 604 | context.lineTo(halfUp(x), halfDown(y + this.attr_('axisTickSize'))); |
fbe31dc8 DV |
605 | context.closePath(); |
606 | context.stroke(); | |
607 | ||
34fedff8 | 608 | var label = makeDiv(tick[1]); |
fbe31dc8 | 609 | label.style.textAlign = "center"; |
423f5ed3 | 610 | label.style.top = (y + this.attr_('axisTickSize')) + 'px'; |
fbe31dc8 | 611 | |
423f5ed3 DV |
612 | var left = (x - this.attr_('axisLabelWidth')/2); |
613 | if (left + this.attr_('axisLabelWidth') > this.width) { | |
614 | left = this.width - this.attr_('xAxisLabelWidth'); | |
fbe31dc8 DV |
615 | label.style.textAlign = "right"; |
616 | } | |
617 | if (left < 0) { | |
618 | left = 0; | |
619 | label.style.textAlign = "left"; | |
620 | } | |
621 | ||
622 | label.style.left = left + "px"; | |
423f5ed3 | 623 | label.style.width = this.attr_('xAxisLabelWidth') + "px"; |
b0c3b730 | 624 | this.container.appendChild(label); |
fbe31dc8 | 625 | this.xlabels.push(label); |
2160ed4a | 626 | } |
fbe31dc8 DV |
627 | } |
628 | ||
629 | context.beginPath(); | |
528ce7e5 DV |
630 | context.moveTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h)); |
631 | context.lineTo(halfUp(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); | |
fbe31dc8 DV |
632 | context.closePath(); |
633 | context.stroke(); | |
634 | } | |
635 | ||
636 | context.restore(); | |
6a1aa64f DV |
637 | }; |
638 | ||
fbe31dc8 | 639 | |
ad1798c2 DV |
640 | DygraphCanvasRenderer.prototype._renderChartLabels = function() { |
641 | // Generate divs for the chart title, xlabel and ylabel. | |
642 | // Space for these divs has already been taken away from the charting area in | |
643 | // the DygraphCanvasRenderer constructor. | |
644 | if (this.attr_('title')) { | |
645 | var div = document.createElement("div"); | |
646 | div.style.position = 'absolute'; | |
647 | div.style.top = '0px'; | |
648 | div.style.left = this.area.x + 'px'; | |
649 | div.style.width = this.area.w + 'px'; | |
650 | div.style.height = this.attr_('titleHeight') + 'px'; | |
651 | div.style.textAlign = 'center'; | |
b4202b3d | 652 | div.style.fontSize = (this.attr_('titleHeight') - 8) + 'px'; |
ad1798c2 | 653 | div.style.fontWeight = 'bold'; |
ca49434a DV |
654 | var class_div = document.createElement("div"); |
655 | class_div.className = 'dygraph-label dygraph-title'; | |
656 | class_div.innerHTML = this.attr_('title'); | |
657 | div.appendChild(class_div); | |
ad1798c2 DV |
658 | this.container.appendChild(div); |
659 | this.chartLabels.title = div; | |
660 | } | |
661 | ||
662 | if (this.attr_('xlabel')) { | |
663 | var div = document.createElement("div"); | |
664 | div.style.position = 'absolute'; | |
665 | div.style.bottom = 0; // TODO(danvk): this is lazy. Calculate style.top. | |
666 | div.style.left = this.area.x + 'px'; | |
667 | div.style.width = this.area.w + 'px'; | |
668 | div.style.height = this.attr_('xLabelHeight') + 'px'; | |
669 | div.style.textAlign = 'center'; | |
86cce9e8 | 670 | div.style.fontSize = (this.attr_('xLabelHeight') - 2) + 'px'; |
ca49434a DV |
671 | |
672 | var class_div = document.createElement("div"); | |
673 | class_div.className = 'dygraph-label dygraph-xlabel'; | |
674 | class_div.innerHTML = this.attr_('xlabel'); | |
675 | div.appendChild(class_div); | |
ad1798c2 DV |
676 | this.container.appendChild(div); |
677 | this.chartLabels.xlabel = div; | |
678 | } | |
679 | ||
680 | if (this.attr_('ylabel')) { | |
681 | var box = { | |
682 | left: 0, | |
683 | top: this.area.y, | |
684 | width: this.attr_('yLabelWidth'), | |
685 | height: this.area.h | |
686 | }; | |
ca49434a | 687 | // TODO(danvk): is this outer div actually necessary? |
ad1798c2 DV |
688 | var div = document.createElement("div"); |
689 | div.style.position = 'absolute'; | |
690 | div.style.left = box.left; | |
691 | div.style.top = box.top + 'px'; | |
692 | div.style.width = box.width + 'px'; | |
693 | div.style.height = box.height + 'px'; | |
86cce9e8 | 694 | div.style.fontSize = (this.attr_('yLabelWidth') - 2) + 'px'; |
ad1798c2 DV |
695 | |
696 | var inner_div = document.createElement("div"); | |
697 | inner_div.style.position = 'absolute'; | |
ad1798c2 DV |
698 | inner_div.style.width = box.height + 'px'; |
699 | inner_div.style.height = box.width + 'px'; | |
700 | inner_div.style.top = (box.height / 2 - box.width / 2) + 'px'; | |
701 | inner_div.style.left = (box.width / 2 - box.height / 2) + 'px'; | |
702 | inner_div.style.textAlign = 'center'; | |
b56b6993 DV |
703 | |
704 | // CSS rotation is an HTML5 feature which is not standardized. Hence every | |
705 | // browser has its own name for the CSS style. | |
ad1798c2 DV |
706 | inner_div.style.transform = 'rotate(-90deg)'; // HTML5 |
707 | inner_div.style.WebkitTransform = 'rotate(-90deg)'; // Safari/Chrome | |
708 | inner_div.style.MozTransform = 'rotate(-90deg)'; // Firefox | |
709 | inner_div.style.OTransform = 'rotate(-90deg)'; // Opera | |
52c47e80 | 710 | inner_div.style.msTransform = 'rotate(-90deg)'; // IE9 |
b56b6993 DV |
711 | |
712 | if (typeof(document.documentMode) !== 'undefined' && | |
713 | document.documentMode < 9) { | |
714 | // We're dealing w/ an old version of IE, so we have to rotate the text | |
715 | // using a BasicImage transform. This uses a different origin of rotation | |
716 | // than HTML5 rotation (top left of div vs. its center). | |
717 | inner_div.style.filter = | |
718 | 'progid:DXImageTransform.Microsoft.BasicImage(rotation=3)'; | |
719 | inner_div.style.left = '0px'; | |
720 | inner_div.style.top = '0px'; | |
721 | } | |
ad1798c2 | 722 | |
ca49434a DV |
723 | var class_div = document.createElement("div"); |
724 | class_div.className = 'dygraph-label dygraph-ylabel'; | |
725 | class_div.innerHTML = this.attr_('ylabel'); | |
726 | ||
727 | inner_div.appendChild(class_div); | |
ad1798c2 DV |
728 | div.appendChild(inner_div); |
729 | this.container.appendChild(div); | |
730 | this.chartLabels.ylabel = div; | |
731 | } | |
732 | }; | |
733 | ||
734 | ||
ce49c2fa DV |
735 | DygraphCanvasRenderer.prototype._renderAnnotations = function() { |
736 | var annotationStyle = { | |
737 | "position": "absolute", | |
423f5ed3 | 738 | "fontSize": this.attr_('axisLabelFontSize') + "px", |
ce49c2fa | 739 | "zIndex": 10, |
3bf2fa91 | 740 | "overflow": "hidden" |
ce49c2fa DV |
741 | }; |
742 | ||
ab5e5c75 DV |
743 | var bindEvt = function(eventName, classEventName, p, self) { |
744 | return function(e) { | |
745 | var a = p.annotation; | |
746 | if (a.hasOwnProperty(eventName)) { | |
747 | a[eventName](a, p, self.dygraph_, e); | |
748 | } else if (self.dygraph_.attr_(classEventName)) { | |
749 | self.dygraph_.attr_(classEventName)(a, p, self.dygraph_,e ); | |
750 | } | |
751 | }; | |
752 | } | |
753 | ||
ce49c2fa DV |
754 | // Get a list of point with annotations. |
755 | var points = this.layout.annotated_points; | |
756 | for (var i = 0; i < points.length; i++) { | |
757 | var p = points[i]; | |
e6d53148 DV |
758 | if (p.canvasx < this.area.x || p.canvasx > this.area.x + this.area.w) { |
759 | continue; | |
760 | } | |
761 | ||
ce5e8d36 DV |
762 | var a = p.annotation; |
763 | var tick_height = 6; | |
764 | if (a.hasOwnProperty("tickHeight")) { | |
765 | tick_height = a.tickHeight; | |
9a40897e DV |
766 | } |
767 | ||
ce49c2fa DV |
768 | var div = document.createElement("div"); |
769 | for (var name in annotationStyle) { | |
770 | if (annotationStyle.hasOwnProperty(name)) { | |
771 | div.style[name] = annotationStyle[name]; | |
772 | } | |
773 | } | |
ce5e8d36 DV |
774 | if (!a.hasOwnProperty('icon')) { |
775 | div.className = "dygraphDefaultAnnotation"; | |
776 | } | |
777 | if (a.hasOwnProperty('cssClass')) { | |
778 | div.className += " " + a.cssClass; | |
779 | } | |
780 | ||
a5ad69cc DV |
781 | var width = a.hasOwnProperty('width') ? a.width : 16; |
782 | var height = a.hasOwnProperty('height') ? a.height : 16; | |
ce5e8d36 DV |
783 | if (a.hasOwnProperty('icon')) { |
784 | var img = document.createElement("img"); | |
785 | img.src = a.icon; | |
33030f33 DV |
786 | img.width = width; |
787 | img.height = height; | |
ce5e8d36 DV |
788 | div.appendChild(img); |
789 | } else if (p.annotation.hasOwnProperty('shortText')) { | |
790 | div.appendChild(document.createTextNode(p.annotation.shortText)); | |
5c528fa2 | 791 | } |
ce5e8d36 | 792 | div.style.left = (p.canvasx - width / 2) + "px"; |
d14b9eed DV |
793 | if (a.attachAtBottom) { |
794 | div.style.top = (this.area.h - height - tick_height) + "px"; | |
795 | } else { | |
796 | div.style.top = (p.canvasy - height - tick_height) + "px"; | |
797 | } | |
ce5e8d36 DV |
798 | div.style.width = width + "px"; |
799 | div.style.height = height + "px"; | |
ce49c2fa DV |
800 | div.title = p.annotation.text; |
801 | div.style.color = this.colors[p.name]; | |
802 | div.style.borderColor = this.colors[p.name]; | |
e6d53148 | 803 | a.div = div; |
ab5e5c75 | 804 | |
9a40897e DV |
805 | Dygraph.addEvent(div, 'click', |
806 | bindEvt('clickHandler', 'annotationClickHandler', p, this)); | |
807 | Dygraph.addEvent(div, 'mouseover', | |
808 | bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p, this)); | |
809 | Dygraph.addEvent(div, 'mouseout', | |
810 | bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p, this)); | |
811 | Dygraph.addEvent(div, 'dblclick', | |
812 | bindEvt('dblClickHandler', 'annotationDblClickHandler', p, this)); | |
ab5e5c75 | 813 | |
ce49c2fa DV |
814 | this.container.appendChild(div); |
815 | this.annotations.push(div); | |
9a40897e | 816 | |
2cf95fff | 817 | var ctx = this.elementContext; |
9a40897e DV |
818 | ctx.strokeStyle = this.colors[p.name]; |
819 | ctx.beginPath(); | |
d14b9eed DV |
820 | if (!a.attachAtBottom) { |
821 | ctx.moveTo(p.canvasx, p.canvasy); | |
822 | ctx.lineTo(p.canvasx, p.canvasy - 2 - tick_height); | |
823 | } else { | |
824 | ctx.moveTo(p.canvasx, this.area.h); | |
825 | ctx.lineTo(p.canvasx, this.area.h - 2 - tick_height); | |
826 | } | |
9a40897e DV |
827 | ctx.closePath(); |
828 | ctx.stroke(); | |
ce49c2fa DV |
829 | } |
830 | }; | |
831 | ||
832 | ||
6a1aa64f DV |
833 | /** |
834 | * Overrides the CanvasRenderer method to draw error bars | |
835 | */ | |
285a6bda | 836 | DygraphCanvasRenderer.prototype._renderLineChart = function() { |
44c6bc29 | 837 | // TODO(danvk): use this.attr_ for many of these. |
2cf95fff | 838 | var context = this.elementContext; |
6a1aa64f DV |
839 | var colorCount = this.options.colorScheme.length; |
840 | var colorScheme = this.options.colorScheme; | |
423f5ed3 | 841 | var fillAlpha = this.attr_('fillAlpha'); |
b2c9222a | 842 | var errorBars = this.attr_("errorBars"); |
44c6bc29 | 843 | var fillGraph = this.attr_("fillGraph"); |
b2c9222a DV |
844 | var stackedGraph = this.attr_("stackedGraph"); |
845 | var stepPlot = this.attr_("stepPlot"); | |
21d3323f DV |
846 | |
847 | var setNames = []; | |
ca43052c | 848 | for (var name in this.layout.datasets) { |
85b99f0b DV |
849 | if (this.layout.datasets.hasOwnProperty(name)) { |
850 | setNames.push(name); | |
851 | } | |
ca43052c | 852 | } |
21d3323f | 853 | var setCount = setNames.length; |
6a1aa64f | 854 | |
f032c51d AV |
855 | this.colors = {} |
856 | for (var i = 0; i < setCount; i++) { | |
857 | this.colors[setNames[i]] = colorScheme[i % colorCount]; | |
858 | } | |
859 | ||
ff00d3e2 DV |
860 | // Update Points |
861 | // TODO(danvk): here | |
2160ed4a DV |
862 | for (var i = 0; i < this.layout.points.length; i++) { |
863 | var point = this.layout.points[i]; | |
6a1aa64f DV |
864 | point.canvasx = this.area.w * point.x + this.area.x; |
865 | point.canvasy = this.area.h * point.y + this.area.y; | |
866 | } | |
6a1aa64f DV |
867 | |
868 | // create paths | |
80aaae18 DV |
869 | var ctx = context; |
870 | if (errorBars) { | |
6a834bbb DV |
871 | if (fillGraph) { |
872 | this.dygraph_.warn("Can't use fillGraph option with error bars"); | |
873 | } | |
874 | ||
6a1aa64f DV |
875 | for (var i = 0; i < setCount; i++) { |
876 | var setName = setNames[i]; | |
b2c9222a | 877 | var axis = this.dygraph_.axisPropertiesForSeries(setName); |
f032c51d | 878 | var color = this.colors[setName]; |
6a1aa64f DV |
879 | |
880 | // setup graphics context | |
80aaae18 | 881 | ctx.save(); |
56623f3b | 882 | var prevX = NaN; |
afdc483f | 883 | var prevY = NaN; |
6a1aa64f | 884 | var prevYs = [-1, -1]; |
ea4942ed | 885 | var yscale = axis.yscale; |
f474c2a3 DV |
886 | // should be same color as the lines but only 15% opaque. |
887 | var rgb = new RGBColor(color); | |
43af96e7 NK |
888 | var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + |
889 | fillAlpha + ')'; | |
f474c2a3 | 890 | ctx.fillStyle = err_color; |
05c9d0c4 DV |
891 | ctx.beginPath(); |
892 | for (var j = 0; j < this.layout.points.length; j++) { | |
893 | var point = this.layout.points[j]; | |
6a1aa64f | 894 | if (point.name == setName) { |
e9fe4a2f | 895 | if (!Dygraph.isOK(point.y)) { |
56623f3b | 896 | prevX = NaN; |
ae85914a | 897 | continue; |
5011e7a1 | 898 | } |
ce49c2fa | 899 | |
3637724f | 900 | // TODO(danvk): here |
afdc483f NN |
901 | if (stepPlot) { |
902 | var newYs = [ prevY - point.errorPlus * yscale, | |
47600757 | 903 | prevY + point.errorMinus * yscale ]; |
afdc483f NN |
904 | prevY = point.y; |
905 | } else { | |
906 | var newYs = [ point.y - point.errorPlus * yscale, | |
47600757 | 907 | point.y + point.errorMinus * yscale ]; |
afdc483f | 908 | } |
6a1aa64f DV |
909 | newYs[0] = this.area.h * newYs[0] + this.area.y; |
910 | newYs[1] = this.area.h * newYs[1] + this.area.y; | |
56623f3b | 911 | if (!isNaN(prevX)) { |
afdc483f | 912 | if (stepPlot) { |
47600757 | 913 | ctx.moveTo(prevX, newYs[0]); |
afdc483f | 914 | } else { |
47600757 | 915 | ctx.moveTo(prevX, prevYs[0]); |
afdc483f | 916 | } |
5954ef32 DV |
917 | ctx.lineTo(point.canvasx, newYs[0]); |
918 | ctx.lineTo(point.canvasx, newYs[1]); | |
afdc483f | 919 | if (stepPlot) { |
47600757 | 920 | ctx.lineTo(prevX, newYs[1]); |
afdc483f | 921 | } else { |
47600757 | 922 | ctx.lineTo(prevX, prevYs[1]); |
afdc483f | 923 | } |
5954ef32 DV |
924 | ctx.closePath(); |
925 | } | |
354e15ab | 926 | prevYs = newYs; |
5954ef32 DV |
927 | prevX = point.canvasx; |
928 | } | |
929 | } | |
930 | ctx.fill(); | |
931 | } | |
932 | } else if (fillGraph) { | |
354e15ab DE |
933 | var baseline = [] // for stacked graphs: baseline for filling |
934 | ||
935 | // process sets in reverse order (needed for stacked graphs) | |
936 | for (var i = setCount - 1; i >= 0; i--) { | |
5954ef32 | 937 | var setName = setNames[i]; |
f032c51d | 938 | var color = this.colors[setName]; |
b2c9222a | 939 | var axis = this.dygraph_.axisPropertiesForSeries(setName); |
ea4942ed DV |
940 | var axisY = 1.0 + axis.minyval * axis.yscale; |
941 | if (axisY < 0.0) axisY = 0.0; | |
942 | else if (axisY > 1.0) axisY = 1.0; | |
943 | axisY = this.area.h * axisY + this.area.y; | |
5954ef32 DV |
944 | |
945 | // setup graphics context | |
946 | ctx.save(); | |
56623f3b | 947 | var prevX = NaN; |
5954ef32 | 948 | var prevYs = [-1, -1]; |
ea4942ed | 949 | var yscale = axis.yscale; |
5954ef32 DV |
950 | // should be same color as the lines but only 15% opaque. |
951 | var rgb = new RGBColor(color); | |
43af96e7 NK |
952 | var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + |
953 | fillAlpha + ')'; | |
5954ef32 DV |
954 | ctx.fillStyle = err_color; |
955 | ctx.beginPath(); | |
956 | for (var j = 0; j < this.layout.points.length; j++) { | |
957 | var point = this.layout.points[j]; | |
5954ef32 | 958 | if (point.name == setName) { |
e9fe4a2f | 959 | if (!Dygraph.isOK(point.y)) { |
56623f3b | 960 | prevX = NaN; |
5954ef32 DV |
961 | continue; |
962 | } | |
354e15ab DE |
963 | var newYs; |
964 | if (stackedGraph) { | |
965 | lastY = baseline[point.canvasx]; | |
966 | if (lastY === undefined) lastY = axisY; | |
967 | baseline[point.canvasx] = point.canvasy; | |
968 | newYs = [ point.canvasy, lastY ]; | |
969 | } else { | |
970 | newYs = [ point.canvasy, axisY ]; | |
971 | } | |
56623f3b | 972 | if (!isNaN(prevX)) { |
05c9d0c4 | 973 | ctx.moveTo(prevX, prevYs[0]); |
afdc483f | 974 | if (stepPlot) { |
47600757 | 975 | ctx.lineTo(point.canvasx, prevYs[0]); |
afdc483f | 976 | } else { |
47600757 | 977 | ctx.lineTo(point.canvasx, newYs[0]); |
afdc483f | 978 | } |
05c9d0c4 DV |
979 | ctx.lineTo(point.canvasx, newYs[1]); |
980 | ctx.lineTo(prevX, prevYs[1]); | |
981 | ctx.closePath(); | |
6a1aa64f | 982 | } |
354e15ab | 983 | prevYs = newYs; |
6a1aa64f DV |
984 | prevX = point.canvasx; |
985 | } | |
05c9d0c4 | 986 | } |
6a1aa64f DV |
987 | ctx.fill(); |
988 | } | |
80aaae18 DV |
989 | } |
990 | ||
991 | for (var i = 0; i < setCount; i++) { | |
992 | var setName = setNames[i]; | |
f032c51d | 993 | var color = this.colors[setName]; |
227b93cc | 994 | var strokeWidth = this.dygraph_.attr_("strokeWidth", setName); |
80aaae18 DV |
995 | |
996 | // setup graphics context | |
997 | context.save(); | |
998 | var point = this.layout.points[0]; | |
227b93cc | 999 | var pointSize = this.dygraph_.attr_("pointSize", setName); |
80aaae18 | 1000 | var prevX = null, prevY = null; |
227b93cc | 1001 | var drawPoints = this.dygraph_.attr_("drawPoints", setName); |
80aaae18 DV |
1002 | var points = this.layout.points; |
1003 | for (var j = 0; j < points.length; j++) { | |
1004 | var point = points[j]; | |
1005 | if (point.name == setName) { | |
e9fe4a2f | 1006 | if (!Dygraph.isOK(point.canvasy)) { |
5d13ef68 | 1007 | if (stepPlot && prevX != null) { |
0599d13b NN |
1008 | // Draw a horizontal line to the start of the missing data |
1009 | ctx.beginPath(); | |
1010 | ctx.strokeStyle = color; | |
423f5ed3 | 1011 | ctx.lineWidth = this.attr_('strokeWidth'); |
0599d13b NN |
1012 | ctx.moveTo(prevX, prevY); |
1013 | ctx.lineTo(point.canvasx, prevY); | |
1014 | ctx.stroke(); | |
1015 | } | |
80aaae18 DV |
1016 | // this will make us move to the next point, not draw a line to it. |
1017 | prevX = prevY = null; | |
1018 | } else { | |
1019 | // A point is "isolated" if it is non-null but both the previous | |
1020 | // and next points are null. | |
1021 | var isIsolated = (!prevX && (j == points.length - 1 || | |
e9fe4a2f | 1022 | !Dygraph.isOK(points[j+1].canvasy))); |
80aaae18 DV |
1023 | |
1024 | if (!prevX) { | |
1025 | prevX = point.canvasx; | |
1026 | prevY = point.canvasy; | |
1027 | } else { | |
46dde5f9 DV |
1028 | // TODO(danvk): figure out why this conditional is necessary. |
1029 | if (strokeWidth) { | |
1030 | ctx.beginPath(); | |
1031 | ctx.strokeStyle = color; | |
1032 | ctx.lineWidth = strokeWidth; | |
1033 | ctx.moveTo(prevX, prevY); | |
1034 | if (stepPlot) { | |
1035 | ctx.lineTo(point.canvasx, prevY); | |
1036 | } | |
1037 | prevX = point.canvasx; | |
1038 | prevY = point.canvasy; | |
1039 | ctx.lineTo(prevX, prevY); | |
1040 | ctx.stroke(); | |
afdc483f | 1041 | } |
80aaae18 DV |
1042 | } |
1043 | ||
1044 | if (drawPoints || isIsolated) { | |
1045 | ctx.beginPath(); | |
1046 | ctx.fillStyle = color; | |
7bf6a9fe DV |
1047 | ctx.arc(point.canvasx, point.canvasy, pointSize, |
1048 | 0, 2 * Math.PI, false); | |
80aaae18 DV |
1049 | ctx.fill(); |
1050 | } | |
1051 | } | |
1052 | } | |
1053 | } | |
1054 | } | |
6a1aa64f | 1055 | |
6a1aa64f DV |
1056 | context.restore(); |
1057 | }; |