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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 DV |
281 | // Subclass PlotKit.CanvasRenderer to add: |
282 | // 1. X/Y grid overlay | |
283 | // 2. Ability to draw error bars (if required) | |
284 | ||
285 | /** | |
286 | * Sets some PlotKit.CanvasRenderer options | |
287 | * @param {Object} element The canvas to attach to | |
2cf95fff RK |
288 | * @param {Object} elementContext The 2d context of the canvas (injected so it |
289 | * can be mocked for testing.) | |
285a6bda | 290 | * @param {Layout} layout The DygraphLayout object for this graph. |
6a1aa64f DV |
291 | * @param {Object} options Options to pass on to CanvasRenderer |
292 | */ | |
2cf95fff RK |
293 | DygraphCanvasRenderer = function(dygraph, element, elementContext, layout, |
294 | options) { | |
9317362d | 295 | // TODO(danvk): remove options, just use dygraph.attr_. |
9317362d | 296 | this.dygraph_ = dygraph; |
fbe31dc8 DV |
297 | |
298 | // default options | |
299 | this.options = { | |
f474c2a3 DV |
300 | "strokeWidth": 0.5, |
301 | "drawXAxis": true, | |
302 | "drawYAxis": true, | |
303 | "axisLineColor": "black", | |
304 | "axisLineWidth": 0.5, | |
305 | "axisTickSize": 3, | |
306 | "axisLabelColor": "black", | |
307 | "axisLabelFont": "Arial", | |
308 | "axisLabelFontSize": 9, | |
309 | "axisLabelWidth": 50, | |
310 | "drawYGrid": true, | |
311 | "drawXGrid": true, | |
43af96e7 | 312 | "gridLineColor": "rgb(128,128,128)", |
e7746234 EC |
313 | "fillAlpha": 0.15, |
314 | "underlayCallback": null | |
fbe31dc8 | 315 | }; |
fc80a396 | 316 | Dygraph.update(this.options, options); |
6a1aa64f | 317 | |
fbe31dc8 | 318 | this.layout = layout; |
b0c3b730 | 319 | this.element = element; |
2cf95fff | 320 | this.elementContext = elementContext; |
fbe31dc8 DV |
321 | this.container = this.element.parentNode; |
322 | ||
fbe31dc8 DV |
323 | this.height = this.element.height; |
324 | this.width = this.element.width; | |
325 | ||
326 | // --- check whether everything is ok before we return | |
327 | if (!this.isIE && !(DygraphCanvasRenderer.isSupported(this.element))) | |
328 | throw "Canvas is not supported."; | |
329 | ||
330 | // internal state | |
331 | this.xlabels = new Array(); | |
332 | this.ylabels = new Array(); | |
ce49c2fa | 333 | this.annotations = new Array(); |
ad1798c2 | 334 | this.chartLabels = {}; |
fbe31dc8 | 335 | |
ea4942ed | 336 | // TODO(danvk): consider all axes in this computation. |
fbe31dc8 | 337 | this.area = { |
9012dd21 | 338 | // TODO(danvk): per-axis setting. |
fbe31dc8 DV |
339 | x: this.options.yAxisLabelWidth + 2 * this.options.axisTickSize, |
340 | y: 0 | |
341 | }; | |
342 | this.area.w = this.width - this.area.x - this.options.rightGap; | |
343 | this.area.h = this.height - this.options.axisLabelFontSize - | |
344 | 2 * this.options.axisTickSize; | |
345 | ||
26ca7938 DV |
346 | // Shrink the drawing area to accomodate additional y-axes. |
347 | if (this.dygraph_.numAxes() == 2) { | |
348 | // TODO(danvk): per-axis setting. | |
349 | this.area.w -= (this.options.yAxisLabelWidth + 2 * this.options.axisTickSize); | |
350 | } else if (this.dygraph_.numAxes() > 2) { | |
351 | this.dygraph_.error("Only two y-axes are supported at this time. (Trying " + | |
34de8b76 | 352 | "to use " + this.dygraph_.numAxes() + ")"); |
26ca7938 DV |
353 | } |
354 | ||
ad1798c2 DV |
355 | // Add space for chart labels: title, xlabel and ylabel. |
356 | if (this.attr_('title')) { | |
ad1798c2 DV |
357 | this.area.h -= this.attr_('titleHeight'); |
358 | this.area.y += this.attr_('titleHeight'); | |
359 | } | |
360 | if (this.attr_('xlabel')) { | |
ad1798c2 DV |
361 | this.area.h -= this.attr_('xLabelHeight'); |
362 | } | |
363 | if (this.attr_('ylabel')) { | |
ca49434a DV |
364 | // It would make sense to shift the chart here to make room for the y-axis |
365 | // label, but the default yAxisLabelWidth is large enough that this results | |
366 | // in overly-padded charts. The y-axis label should fit fine. If it | |
367 | // doesn't, the yAxisLabelWidth option can be increased. | |
ad1798c2 DV |
368 | } |
369 | ||
b0c3b730 DV |
370 | this.container.style.position = "relative"; |
371 | this.container.style.width = this.width + "px"; | |
26ca7938 DV |
372 | |
373 | // Set up a clipping area for the canvas (and the interaction canvas). | |
374 | // This ensures that we don't overdraw. | |
2cf95fff | 375 | var ctx = this.dygraph_.canvas_ctx_; |
26ca7938 DV |
376 | ctx.beginPath(); |
377 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
378 | ctx.clip(); | |
379 | ||
2cf95fff | 380 | ctx = this.dygraph_.hidden_ctx_; |
26ca7938 DV |
381 | ctx.beginPath(); |
382 | ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); | |
383 | ctx.clip(); | |
fbe31dc8 DV |
384 | }; |
385 | ||
44c6bc29 DV |
386 | DygraphCanvasRenderer.prototype.attr_ = function(x) { |
387 | return this.dygraph_.attr_(x); | |
388 | }; | |
389 | ||
fbe31dc8 DV |
390 | DygraphCanvasRenderer.prototype.clear = function() { |
391 | if (this.isIE) { | |
392 | // VML takes a while to start up, so we just poll every this.IEDelay | |
393 | try { | |
394 | if (this.clearDelay) { | |
395 | this.clearDelay.cancel(); | |
396 | this.clearDelay = null; | |
397 | } | |
2cf95fff | 398 | var context = this.elementContext; |
fbe31dc8 DV |
399 | } |
400 | catch (e) { | |
76171648 | 401 | // TODO(danvk): this is broken, since MochiKit.Async is gone. |
fbe31dc8 DV |
402 | this.clearDelay = MochiKit.Async.wait(this.IEDelay); |
403 | this.clearDelay.addCallback(bind(this.clear, this)); | |
404 | return; | |
405 | } | |
406 | } | |
407 | ||
2cf95fff | 408 | var context = this.elementContext; |
fbe31dc8 DV |
409 | context.clearRect(0, 0, this.width, this.height); |
410 | ||
2160ed4a | 411 | for (var i = 0; i < this.xlabels.length; i++) { |
b0c3b730 | 412 | var el = this.xlabels[i]; |
b304aaec | 413 | if (el.parentNode) el.parentNode.removeChild(el); |
2160ed4a DV |
414 | } |
415 | for (var i = 0; i < this.ylabels.length; i++) { | |
b0c3b730 | 416 | var el = this.ylabels[i]; |
b304aaec | 417 | if (el.parentNode) el.parentNode.removeChild(el); |
2160ed4a | 418 | } |
ce49c2fa DV |
419 | for (var i = 0; i < this.annotations.length; i++) { |
420 | var el = this.annotations[i]; | |
b304aaec | 421 | if (el.parentNode) el.parentNode.removeChild(el); |
ce49c2fa | 422 | } |
ad1798c2 DV |
423 | for (var k in this.chartLabels) { |
424 | if (!this.chartLabels.hasOwnProperty(k)) continue; | |
425 | var el = this.chartLabels[k]; | |
426 | if (el.parentNode) el.parentNode.removeChild(el); | |
427 | } | |
fbe31dc8 DV |
428 | this.xlabels = new Array(); |
429 | this.ylabels = new Array(); | |
ce49c2fa | 430 | this.annotations = new Array(); |
ad1798c2 | 431 | this.chartLabels = {}; |
fbe31dc8 DV |
432 | }; |
433 | ||
434 | ||
435 | DygraphCanvasRenderer.isSupported = function(canvasName) { | |
436 | var canvas = null; | |
437 | try { | |
21d3323f | 438 | if (typeof(canvasName) == 'undefined' || canvasName == null) |
b0c3b730 | 439 | canvas = document.createElement("canvas"); |
fbe31dc8 | 440 | else |
b0c3b730 | 441 | canvas = canvasName; |
fbe31dc8 DV |
442 | var context = canvas.getContext("2d"); |
443 | } | |
444 | catch (e) { | |
445 | var ie = navigator.appVersion.match(/MSIE (\d\.\d)/); | |
446 | var opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1); | |
447 | if ((!ie) || (ie[1] < 6) || (opera)) | |
448 | return false; | |
449 | return true; | |
450 | } | |
451 | return true; | |
6a1aa64f | 452 | }; |
6a1aa64f DV |
453 | |
454 | /** | |
455 | * Draw an X/Y grid on top of the existing plot | |
456 | */ | |
285a6bda | 457 | DygraphCanvasRenderer.prototype.render = function() { |
528ce7e5 DV |
458 | // Draw the new X/Y grid. Lines appear crisper when pixels are rounded to |
459 | // half-integers. This prevents them from drawing in two rows/cols. | |
2cf95fff | 460 | var ctx = this.elementContext; |
528ce7e5 DV |
461 | function halfUp(x){return Math.round(x)+0.5}; |
462 | function halfDown(y){return Math.round(y)-0.5}; | |
e7746234 EC |
463 | |
464 | if (this.options.underlayCallback) { | |
1e41bd2d DV |
465 | // NOTE: we pass the dygraph object to this callback twice to avoid breaking |
466 | // users who expect a deprecated form of this callback. | |
467 | this.options.underlayCallback(ctx, this.area, this.dygraph_, this.dygraph_); | |
e7746234 EC |
468 | } |
469 | ||
6a1aa64f DV |
470 | if (this.options.drawYGrid) { |
471 | var ticks = this.layout.yticks; | |
472 | ctx.save(); | |
f2f24402 | 473 | ctx.strokeStyle = this.options.gridLineColor; |
6a1aa64f DV |
474 | ctx.lineWidth = this.options.axisLineWidth; |
475 | for (var i = 0; i < ticks.length; i++) { | |
880a574f DV |
476 | // TODO(danvk): allow secondary axes to draw a grid, too. |
477 | if (ticks[i][0] != 0) continue; | |
528ce7e5 DV |
478 | var x = halfUp(this.area.x); |
479 | var y = halfDown(this.area.y + ticks[i][1] * this.area.h); | |
6a1aa64f DV |
480 | ctx.beginPath(); |
481 | ctx.moveTo(x, y); | |
482 | ctx.lineTo(x + this.area.w, y); | |
483 | ctx.closePath(); | |
484 | ctx.stroke(); | |
485 | } | |
486 | } | |
487 | ||
488 | if (this.options.drawXGrid) { | |
489 | var ticks = this.layout.xticks; | |
490 | ctx.save(); | |
f2f24402 | 491 | ctx.strokeStyle = this.options.gridLineColor; |
6a1aa64f DV |
492 | ctx.lineWidth = this.options.axisLineWidth; |
493 | for (var i=0; i<ticks.length; i++) { | |
528ce7e5 DV |
494 | var x = halfUp(this.area.x + ticks[i][0] * this.area.w); |
495 | var y = halfDown(this.area.y + this.area.h); | |
6a1aa64f | 496 | ctx.beginPath(); |
880a574f | 497 | ctx.moveTo(x, y); |
6a1aa64f DV |
498 | ctx.lineTo(x, this.area.y); |
499 | ctx.closePath(); | |
500 | ctx.stroke(); | |
501 | } | |
502 | } | |
2ce09b19 DV |
503 | |
504 | // Do the ordinary rendering, as before | |
2ce09b19 | 505 | this._renderLineChart(); |
fbe31dc8 | 506 | this._renderAxis(); |
ad1798c2 | 507 | this._renderChartLabels(); |
ce49c2fa | 508 | this._renderAnnotations(); |
fbe31dc8 DV |
509 | }; |
510 | ||
511 | ||
512 | DygraphCanvasRenderer.prototype._renderAxis = function() { | |
513 | if (!this.options.drawXAxis && !this.options.drawYAxis) | |
514 | return; | |
515 | ||
528ce7e5 DV |
516 | // Round pixels to half-integer boundaries for crisper drawing. |
517 | function halfUp(x){return Math.round(x)+0.5}; | |
518 | function halfDown(y){return Math.round(y)-0.5}; | |
519 | ||
2cf95fff | 520 | var context = this.elementContext; |
fbe31dc8 | 521 | |
34fedff8 DV |
522 | var labelStyle = { |
523 | "position": "absolute", | |
524 | "fontSize": this.options.axisLabelFontSize + "px", | |
525 | "zIndex": 10, | |
f474c2a3 | 526 | "color": this.options.axisLabelColor, |
34fedff8 DV |
527 | "width": this.options.axisLabelWidth + "px", |
528 | "overflow": "hidden" | |
529 | }; | |
530 | var makeDiv = function(txt) { | |
531 | var div = document.createElement("div"); | |
532 | for (var name in labelStyle) { | |
85b99f0b DV |
533 | if (labelStyle.hasOwnProperty(name)) { |
534 | div.style[name] = labelStyle[name]; | |
535 | } | |
fbe31dc8 | 536 | } |
34fedff8 DV |
537 | div.appendChild(document.createTextNode(txt)); |
538 | return div; | |
fbe31dc8 DV |
539 | }; |
540 | ||
541 | // axis lines | |
542 | context.save(); | |
f474c2a3 | 543 | context.strokeStyle = this.options.axisLineColor; |
fbe31dc8 DV |
544 | context.lineWidth = this.options.axisLineWidth; |
545 | ||
fbe31dc8 | 546 | if (this.options.drawYAxis) { |
8b7a0cc3 | 547 | if (this.layout.yticks && this.layout.yticks.length > 0) { |
2160ed4a DV |
548 | for (var i = 0; i < this.layout.yticks.length; i++) { |
549 | var tick = this.layout.yticks[i]; | |
fbe31dc8 DV |
550 | if (typeof(tick) == "function") return; |
551 | var x = this.area.x; | |
880a574f DV |
552 | var sgn = 1; |
553 | if (tick[0] == 1) { // right-side y-axis | |
554 | x = this.area.x + this.area.w; | |
555 | sgn = -1; | |
9012dd21 DV |
556 | } |
557 | var y = this.area.y + tick[1] * this.area.h; | |
fbe31dc8 | 558 | context.beginPath(); |
528ce7e5 DV |
559 | context.moveTo(halfUp(x), halfDown(y)); |
560 | context.lineTo(halfUp(x - sgn * this.options.axisTickSize), halfDown(y)); | |
fbe31dc8 DV |
561 | context.closePath(); |
562 | context.stroke(); | |
563 | ||
9012dd21 | 564 | var label = makeDiv(tick[2]); |
fbe31dc8 DV |
565 | var top = (y - this.options.axisLabelFontSize / 2); |
566 | if (top < 0) top = 0; | |
567 | ||
568 | if (top + this.options.axisLabelFontSize + 3 > this.height) { | |
569 | label.style.bottom = "0px"; | |
570 | } else { | |
571 | label.style.top = top + "px"; | |
572 | } | |
9012dd21 | 573 | if (tick[0] == 0) { |
ad1798c2 | 574 | label.style.left = (this.area.x - this.options.yAxisLabelWidth - this.options.axisTickSize) + "px"; |
9012dd21 DV |
575 | label.style.textAlign = "right"; |
576 | } else if (tick[0] == 1) { | |
577 | label.style.left = (this.area.x + this.area.w + | |
578 | this.options.axisTickSize) + "px"; | |
579 | label.style.textAlign = "left"; | |
580 | } | |
fbe31dc8 | 581 | label.style.width = this.options.yAxisLabelWidth + "px"; |
b0c3b730 | 582 | this.container.appendChild(label); |
fbe31dc8 | 583 | this.ylabels.push(label); |
2160ed4a | 584 | } |
fbe31dc8 DV |
585 | |
586 | // The lowest tick on the y-axis often overlaps with the leftmost | |
587 | // tick on the x-axis. Shift the bottom tick up a little bit to | |
588 | // compensate if necessary. | |
589 | var bottomTick = this.ylabels[0]; | |
590 | var fontSize = this.options.axisLabelFontSize; | |
591 | var bottom = parseInt(bottomTick.style.top) + fontSize; | |
592 | if (bottom > this.height - fontSize) { | |
593 | bottomTick.style.top = (parseInt(bottomTick.style.top) - | |
594 | fontSize / 2) + "px"; | |
595 | } | |
596 | } | |
597 | ||
528ce7e5 | 598 | // draw a vertical line on the left to separate the chart from the labels. |
fbe31dc8 | 599 | context.beginPath(); |
528ce7e5 DV |
600 | context.moveTo(halfUp(this.area.x), halfDown(this.area.y)); |
601 | context.lineTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h)); | |
fbe31dc8 DV |
602 | context.closePath(); |
603 | context.stroke(); | |
c1dbeb10 | 604 | |
528ce7e5 | 605 | // if there's a secondary y-axis, draw a vertical line for that, too. |
c1dbeb10 DV |
606 | if (this.dygraph_.numAxes() == 2) { |
607 | context.beginPath(); | |
528ce7e5 DV |
608 | context.moveTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y)); |
609 | context.lineTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); | |
c1dbeb10 DV |
610 | context.closePath(); |
611 | context.stroke(); | |
612 | } | |
fbe31dc8 DV |
613 | } |
614 | ||
615 | if (this.options.drawXAxis) { | |
616 | if (this.layout.xticks) { | |
2160ed4a DV |
617 | for (var i = 0; i < this.layout.xticks.length; i++) { |
618 | var tick = this.layout.xticks[i]; | |
fbe31dc8 DV |
619 | if (typeof(dataset) == "function") return; |
620 | ||
621 | var x = this.area.x + tick[0] * this.area.w; | |
622 | var y = this.area.y + this.area.h; | |
623 | context.beginPath(); | |
528ce7e5 DV |
624 | context.moveTo(halfUp(x), halfDown(y)); |
625 | context.lineTo(halfUp(x), halfDown(y + this.options.axisTickSize)); | |
fbe31dc8 DV |
626 | context.closePath(); |
627 | context.stroke(); | |
628 | ||
34fedff8 | 629 | var label = makeDiv(tick[1]); |
fbe31dc8 | 630 | label.style.textAlign = "center"; |
ad1798c2 | 631 | label.style.top = (y + this.options.axisTickSize) + 'px'; |
fbe31dc8 DV |
632 | |
633 | var left = (x - this.options.axisLabelWidth/2); | |
634 | if (left + this.options.axisLabelWidth > this.width) { | |
635 | left = this.width - this.options.xAxisLabelWidth; | |
636 | label.style.textAlign = "right"; | |
637 | } | |
638 | if (left < 0) { | |
639 | left = 0; | |
640 | label.style.textAlign = "left"; | |
641 | } | |
642 | ||
643 | label.style.left = left + "px"; | |
644 | label.style.width = this.options.xAxisLabelWidth + "px"; | |
b0c3b730 | 645 | this.container.appendChild(label); |
fbe31dc8 | 646 | this.xlabels.push(label); |
2160ed4a | 647 | } |
fbe31dc8 DV |
648 | } |
649 | ||
650 | context.beginPath(); | |
528ce7e5 DV |
651 | context.moveTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h)); |
652 | context.lineTo(halfUp(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); | |
fbe31dc8 DV |
653 | context.closePath(); |
654 | context.stroke(); | |
655 | } | |
656 | ||
657 | context.restore(); | |
6a1aa64f DV |
658 | }; |
659 | ||
fbe31dc8 | 660 | |
ad1798c2 DV |
661 | DygraphCanvasRenderer.prototype._renderChartLabels = function() { |
662 | // Generate divs for the chart title, xlabel and ylabel. | |
663 | // Space for these divs has already been taken away from the charting area in | |
664 | // the DygraphCanvasRenderer constructor. | |
665 | if (this.attr_('title')) { | |
666 | var div = document.createElement("div"); | |
667 | div.style.position = 'absolute'; | |
668 | div.style.top = '0px'; | |
669 | div.style.left = this.area.x + 'px'; | |
670 | div.style.width = this.area.w + 'px'; | |
671 | div.style.height = this.attr_('titleHeight') + 'px'; | |
672 | div.style.textAlign = 'center'; | |
b4202b3d | 673 | div.style.fontSize = (this.attr_('titleHeight') - 8) + 'px'; |
ad1798c2 | 674 | div.style.fontWeight = 'bold'; |
ca49434a DV |
675 | var class_div = document.createElement("div"); |
676 | class_div.className = 'dygraph-label dygraph-title'; | |
677 | class_div.innerHTML = this.attr_('title'); | |
678 | div.appendChild(class_div); | |
ad1798c2 DV |
679 | this.container.appendChild(div); |
680 | this.chartLabels.title = div; | |
681 | } | |
682 | ||
683 | if (this.attr_('xlabel')) { | |
684 | var div = document.createElement("div"); | |
685 | div.style.position = 'absolute'; | |
686 | div.style.bottom = 0; // TODO(danvk): this is lazy. Calculate style.top. | |
687 | div.style.left = this.area.x + 'px'; | |
688 | div.style.width = this.area.w + 'px'; | |
689 | div.style.height = this.attr_('xLabelHeight') + 'px'; | |
690 | div.style.textAlign = 'center'; | |
86cce9e8 | 691 | div.style.fontSize = (this.attr_('xLabelHeight') - 2) + 'px'; |
ca49434a DV |
692 | |
693 | var class_div = document.createElement("div"); | |
694 | class_div.className = 'dygraph-label dygraph-xlabel'; | |
695 | class_div.innerHTML = this.attr_('xlabel'); | |
696 | div.appendChild(class_div); | |
ad1798c2 DV |
697 | this.container.appendChild(div); |
698 | this.chartLabels.xlabel = div; | |
699 | } | |
700 | ||
701 | if (this.attr_('ylabel')) { | |
702 | var box = { | |
703 | left: 0, | |
704 | top: this.area.y, | |
705 | width: this.attr_('yLabelWidth'), | |
706 | height: this.area.h | |
707 | }; | |
ca49434a | 708 | // TODO(danvk): is this outer div actually necessary? |
ad1798c2 DV |
709 | var div = document.createElement("div"); |
710 | div.style.position = 'absolute'; | |
711 | div.style.left = box.left; | |
712 | div.style.top = box.top + 'px'; | |
713 | div.style.width = box.width + 'px'; | |
714 | div.style.height = box.height + 'px'; | |
86cce9e8 | 715 | div.style.fontSize = (this.attr_('yLabelWidth') - 2) + 'px'; |
ad1798c2 DV |
716 | |
717 | var inner_div = document.createElement("div"); | |
718 | inner_div.style.position = 'absolute'; | |
ad1798c2 DV |
719 | inner_div.style.width = box.height + 'px'; |
720 | inner_div.style.height = box.width + 'px'; | |
721 | inner_div.style.top = (box.height / 2 - box.width / 2) + 'px'; | |
722 | inner_div.style.left = (box.width / 2 - box.height / 2) + 'px'; | |
723 | inner_div.style.textAlign = 'center'; | |
b56b6993 DV |
724 | |
725 | // CSS rotation is an HTML5 feature which is not standardized. Hence every | |
726 | // browser has its own name for the CSS style. | |
ad1798c2 DV |
727 | inner_div.style.transform = 'rotate(-90deg)'; // HTML5 |
728 | inner_div.style.WebkitTransform = 'rotate(-90deg)'; // Safari/Chrome | |
729 | inner_div.style.MozTransform = 'rotate(-90deg)'; // Firefox | |
730 | inner_div.style.OTransform = 'rotate(-90deg)'; // Opera | |
52c47e80 | 731 | inner_div.style.msTransform = 'rotate(-90deg)'; // IE9 |
b56b6993 DV |
732 | |
733 | if (typeof(document.documentMode) !== 'undefined' && | |
734 | document.documentMode < 9) { | |
735 | // We're dealing w/ an old version of IE, so we have to rotate the text | |
736 | // using a BasicImage transform. This uses a different origin of rotation | |
737 | // than HTML5 rotation (top left of div vs. its center). | |
738 | inner_div.style.filter = | |
739 | 'progid:DXImageTransform.Microsoft.BasicImage(rotation=3)'; | |
740 | inner_div.style.left = '0px'; | |
741 | inner_div.style.top = '0px'; | |
742 | } | |
ad1798c2 | 743 | |
ca49434a DV |
744 | var class_div = document.createElement("div"); |
745 | class_div.className = 'dygraph-label dygraph-ylabel'; | |
746 | class_div.innerHTML = this.attr_('ylabel'); | |
747 | ||
748 | inner_div.appendChild(class_div); | |
ad1798c2 DV |
749 | div.appendChild(inner_div); |
750 | this.container.appendChild(div); | |
751 | this.chartLabels.ylabel = div; | |
752 | } | |
753 | }; | |
754 | ||
755 | ||
ce49c2fa DV |
756 | DygraphCanvasRenderer.prototype._renderAnnotations = function() { |
757 | var annotationStyle = { | |
758 | "position": "absolute", | |
759 | "fontSize": this.options.axisLabelFontSize + "px", | |
760 | "zIndex": 10, | |
3bf2fa91 | 761 | "overflow": "hidden" |
ce49c2fa DV |
762 | }; |
763 | ||
ab5e5c75 DV |
764 | var bindEvt = function(eventName, classEventName, p, self) { |
765 | return function(e) { | |
766 | var a = p.annotation; | |
767 | if (a.hasOwnProperty(eventName)) { | |
768 | a[eventName](a, p, self.dygraph_, e); | |
769 | } else if (self.dygraph_.attr_(classEventName)) { | |
770 | self.dygraph_.attr_(classEventName)(a, p, self.dygraph_,e ); | |
771 | } | |
772 | }; | |
773 | } | |
774 | ||
ce49c2fa DV |
775 | // Get a list of point with annotations. |
776 | var points = this.layout.annotated_points; | |
777 | for (var i = 0; i < points.length; i++) { | |
778 | var p = points[i]; | |
e6d53148 DV |
779 | if (p.canvasx < this.area.x || p.canvasx > this.area.x + this.area.w) { |
780 | continue; | |
781 | } | |
782 | ||
ce5e8d36 DV |
783 | var a = p.annotation; |
784 | var tick_height = 6; | |
785 | if (a.hasOwnProperty("tickHeight")) { | |
786 | tick_height = a.tickHeight; | |
9a40897e DV |
787 | } |
788 | ||
ce49c2fa DV |
789 | var div = document.createElement("div"); |
790 | for (var name in annotationStyle) { | |
791 | if (annotationStyle.hasOwnProperty(name)) { | |
792 | div.style[name] = annotationStyle[name]; | |
793 | } | |
794 | } | |
ce5e8d36 DV |
795 | if (!a.hasOwnProperty('icon')) { |
796 | div.className = "dygraphDefaultAnnotation"; | |
797 | } | |
798 | if (a.hasOwnProperty('cssClass')) { | |
799 | div.className += " " + a.cssClass; | |
800 | } | |
801 | ||
a5ad69cc DV |
802 | var width = a.hasOwnProperty('width') ? a.width : 16; |
803 | var height = a.hasOwnProperty('height') ? a.height : 16; | |
ce5e8d36 DV |
804 | if (a.hasOwnProperty('icon')) { |
805 | var img = document.createElement("img"); | |
806 | img.src = a.icon; | |
33030f33 DV |
807 | img.width = width; |
808 | img.height = height; | |
ce5e8d36 DV |
809 | div.appendChild(img); |
810 | } else if (p.annotation.hasOwnProperty('shortText')) { | |
811 | div.appendChild(document.createTextNode(p.annotation.shortText)); | |
5c528fa2 | 812 | } |
ce5e8d36 | 813 | div.style.left = (p.canvasx - width / 2) + "px"; |
d14b9eed DV |
814 | if (a.attachAtBottom) { |
815 | div.style.top = (this.area.h - height - tick_height) + "px"; | |
816 | } else { | |
817 | div.style.top = (p.canvasy - height - tick_height) + "px"; | |
818 | } | |
ce5e8d36 DV |
819 | div.style.width = width + "px"; |
820 | div.style.height = height + "px"; | |
ce49c2fa DV |
821 | div.title = p.annotation.text; |
822 | div.style.color = this.colors[p.name]; | |
823 | div.style.borderColor = this.colors[p.name]; | |
e6d53148 | 824 | a.div = div; |
ab5e5c75 | 825 | |
9a40897e DV |
826 | Dygraph.addEvent(div, 'click', |
827 | bindEvt('clickHandler', 'annotationClickHandler', p, this)); | |
828 | Dygraph.addEvent(div, 'mouseover', | |
829 | bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p, this)); | |
830 | Dygraph.addEvent(div, 'mouseout', | |
831 | bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p, this)); | |
832 | Dygraph.addEvent(div, 'dblclick', | |
833 | bindEvt('dblClickHandler', 'annotationDblClickHandler', p, this)); | |
ab5e5c75 | 834 | |
ce49c2fa DV |
835 | this.container.appendChild(div); |
836 | this.annotations.push(div); | |
9a40897e | 837 | |
2cf95fff | 838 | var ctx = this.elementContext; |
9a40897e DV |
839 | ctx.strokeStyle = this.colors[p.name]; |
840 | ctx.beginPath(); | |
d14b9eed DV |
841 | if (!a.attachAtBottom) { |
842 | ctx.moveTo(p.canvasx, p.canvasy); | |
843 | ctx.lineTo(p.canvasx, p.canvasy - 2 - tick_height); | |
844 | } else { | |
845 | ctx.moveTo(p.canvasx, this.area.h); | |
846 | ctx.lineTo(p.canvasx, this.area.h - 2 - tick_height); | |
847 | } | |
9a40897e DV |
848 | ctx.closePath(); |
849 | ctx.stroke(); | |
ce49c2fa DV |
850 | } |
851 | }; | |
852 | ||
853 | ||
6a1aa64f DV |
854 | /** |
855 | * Overrides the CanvasRenderer method to draw error bars | |
856 | */ | |
285a6bda | 857 | DygraphCanvasRenderer.prototype._renderLineChart = function() { |
44c6bc29 | 858 | // TODO(danvk): use this.attr_ for many of these. |
2cf95fff | 859 | var context = this.elementContext; |
6a1aa64f DV |
860 | var colorCount = this.options.colorScheme.length; |
861 | var colorScheme = this.options.colorScheme; | |
43af96e7 | 862 | var fillAlpha = this.options.fillAlpha; |
b2c9222a | 863 | var errorBars = this.attr_("errorBars"); |
44c6bc29 | 864 | var fillGraph = this.attr_("fillGraph"); |
b2c9222a DV |
865 | var stackedGraph = this.attr_("stackedGraph"); |
866 | var stepPlot = this.attr_("stepPlot"); | |
21d3323f DV |
867 | |
868 | var setNames = []; | |
ca43052c | 869 | for (var name in this.layout.datasets) { |
85b99f0b DV |
870 | if (this.layout.datasets.hasOwnProperty(name)) { |
871 | setNames.push(name); | |
872 | } | |
ca43052c | 873 | } |
21d3323f | 874 | var setCount = setNames.length; |
6a1aa64f | 875 | |
f032c51d AV |
876 | this.colors = {} |
877 | for (var i = 0; i < setCount; i++) { | |
878 | this.colors[setNames[i]] = colorScheme[i % colorCount]; | |
879 | } | |
880 | ||
ff00d3e2 DV |
881 | // Update Points |
882 | // TODO(danvk): here | |
2160ed4a DV |
883 | for (var i = 0; i < this.layout.points.length; i++) { |
884 | var point = this.layout.points[i]; | |
6a1aa64f DV |
885 | point.canvasx = this.area.w * point.x + this.area.x; |
886 | point.canvasy = this.area.h * point.y + this.area.y; | |
887 | } | |
6a1aa64f DV |
888 | |
889 | // create paths | |
80aaae18 DV |
890 | var ctx = context; |
891 | if (errorBars) { | |
6a834bbb DV |
892 | if (fillGraph) { |
893 | this.dygraph_.warn("Can't use fillGraph option with error bars"); | |
894 | } | |
895 | ||
6a1aa64f DV |
896 | for (var i = 0; i < setCount; i++) { |
897 | var setName = setNames[i]; | |
b2c9222a | 898 | var axis = this.dygraph_.axisPropertiesForSeries(setName); |
f032c51d | 899 | var color = this.colors[setName]; |
6a1aa64f DV |
900 | |
901 | // setup graphics context | |
80aaae18 | 902 | ctx.save(); |
56623f3b | 903 | var prevX = NaN; |
afdc483f | 904 | var prevY = NaN; |
6a1aa64f | 905 | var prevYs = [-1, -1]; |
ea4942ed | 906 | var yscale = axis.yscale; |
f474c2a3 DV |
907 | // should be same color as the lines but only 15% opaque. |
908 | var rgb = new RGBColor(color); | |
43af96e7 NK |
909 | var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + |
910 | fillAlpha + ')'; | |
f474c2a3 | 911 | ctx.fillStyle = err_color; |
05c9d0c4 DV |
912 | ctx.beginPath(); |
913 | for (var j = 0; j < this.layout.points.length; j++) { | |
914 | var point = this.layout.points[j]; | |
6a1aa64f | 915 | if (point.name == setName) { |
e9fe4a2f | 916 | if (!Dygraph.isOK(point.y)) { |
56623f3b | 917 | prevX = NaN; |
ae85914a | 918 | continue; |
5011e7a1 | 919 | } |
ce49c2fa | 920 | |
3637724f | 921 | // TODO(danvk): here |
afdc483f NN |
922 | if (stepPlot) { |
923 | var newYs = [ prevY - point.errorPlus * yscale, | |
47600757 | 924 | prevY + point.errorMinus * yscale ]; |
afdc483f NN |
925 | prevY = point.y; |
926 | } else { | |
927 | var newYs = [ point.y - point.errorPlus * yscale, | |
47600757 | 928 | point.y + point.errorMinus * yscale ]; |
afdc483f | 929 | } |
6a1aa64f DV |
930 | newYs[0] = this.area.h * newYs[0] + this.area.y; |
931 | newYs[1] = this.area.h * newYs[1] + this.area.y; | |
56623f3b | 932 | if (!isNaN(prevX)) { |
afdc483f | 933 | if (stepPlot) { |
47600757 | 934 | ctx.moveTo(prevX, newYs[0]); |
afdc483f | 935 | } else { |
47600757 | 936 | ctx.moveTo(prevX, prevYs[0]); |
afdc483f | 937 | } |
5954ef32 DV |
938 | ctx.lineTo(point.canvasx, newYs[0]); |
939 | ctx.lineTo(point.canvasx, newYs[1]); | |
afdc483f | 940 | if (stepPlot) { |
47600757 | 941 | ctx.lineTo(prevX, newYs[1]); |
afdc483f | 942 | } else { |
47600757 | 943 | ctx.lineTo(prevX, prevYs[1]); |
afdc483f | 944 | } |
5954ef32 DV |
945 | ctx.closePath(); |
946 | } | |
354e15ab | 947 | prevYs = newYs; |
5954ef32 DV |
948 | prevX = point.canvasx; |
949 | } | |
950 | } | |
951 | ctx.fill(); | |
952 | } | |
953 | } else if (fillGraph) { | |
354e15ab DE |
954 | var baseline = [] // for stacked graphs: baseline for filling |
955 | ||
956 | // process sets in reverse order (needed for stacked graphs) | |
957 | for (var i = setCount - 1; i >= 0; i--) { | |
5954ef32 | 958 | var setName = setNames[i]; |
f032c51d | 959 | var color = this.colors[setName]; |
b2c9222a | 960 | var axis = this.dygraph_.axisPropertiesForSeries(setName); |
ea4942ed DV |
961 | var axisY = 1.0 + axis.minyval * axis.yscale; |
962 | if (axisY < 0.0) axisY = 0.0; | |
963 | else if (axisY > 1.0) axisY = 1.0; | |
964 | axisY = this.area.h * axisY + this.area.y; | |
5954ef32 DV |
965 | |
966 | // setup graphics context | |
967 | ctx.save(); | |
56623f3b | 968 | var prevX = NaN; |
5954ef32 | 969 | var prevYs = [-1, -1]; |
ea4942ed | 970 | var yscale = axis.yscale; |
5954ef32 DV |
971 | // should be same color as the lines but only 15% opaque. |
972 | var rgb = new RGBColor(color); | |
43af96e7 NK |
973 | var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + |
974 | fillAlpha + ')'; | |
5954ef32 DV |
975 | ctx.fillStyle = err_color; |
976 | ctx.beginPath(); | |
977 | for (var j = 0; j < this.layout.points.length; j++) { | |
978 | var point = this.layout.points[j]; | |
5954ef32 | 979 | if (point.name == setName) { |
e9fe4a2f | 980 | if (!Dygraph.isOK(point.y)) { |
56623f3b | 981 | prevX = NaN; |
5954ef32 DV |
982 | continue; |
983 | } | |
354e15ab DE |
984 | var newYs; |
985 | if (stackedGraph) { | |
986 | lastY = baseline[point.canvasx]; | |
987 | if (lastY === undefined) lastY = axisY; | |
988 | baseline[point.canvasx] = point.canvasy; | |
989 | newYs = [ point.canvasy, lastY ]; | |
990 | } else { | |
991 | newYs = [ point.canvasy, axisY ]; | |
992 | } | |
56623f3b | 993 | if (!isNaN(prevX)) { |
05c9d0c4 | 994 | ctx.moveTo(prevX, prevYs[0]); |
afdc483f | 995 | if (stepPlot) { |
47600757 | 996 | ctx.lineTo(point.canvasx, prevYs[0]); |
afdc483f | 997 | } else { |
47600757 | 998 | ctx.lineTo(point.canvasx, newYs[0]); |
afdc483f | 999 | } |
05c9d0c4 DV |
1000 | ctx.lineTo(point.canvasx, newYs[1]); |
1001 | ctx.lineTo(prevX, prevYs[1]); | |
1002 | ctx.closePath(); | |
6a1aa64f | 1003 | } |
354e15ab | 1004 | prevYs = newYs; |
6a1aa64f DV |
1005 | prevX = point.canvasx; |
1006 | } | |
05c9d0c4 | 1007 | } |
6a1aa64f DV |
1008 | ctx.fill(); |
1009 | } | |
80aaae18 DV |
1010 | } |
1011 | ||
1012 | for (var i = 0; i < setCount; i++) { | |
1013 | var setName = setNames[i]; | |
f032c51d | 1014 | var color = this.colors[setName]; |
227b93cc | 1015 | var strokeWidth = this.dygraph_.attr_("strokeWidth", setName); |
80aaae18 DV |
1016 | |
1017 | // setup graphics context | |
1018 | context.save(); | |
1019 | var point = this.layout.points[0]; | |
227b93cc | 1020 | var pointSize = this.dygraph_.attr_("pointSize", setName); |
80aaae18 | 1021 | var prevX = null, prevY = null; |
227b93cc | 1022 | var drawPoints = this.dygraph_.attr_("drawPoints", setName); |
80aaae18 DV |
1023 | var points = this.layout.points; |
1024 | for (var j = 0; j < points.length; j++) { | |
1025 | var point = points[j]; | |
1026 | if (point.name == setName) { | |
e9fe4a2f | 1027 | if (!Dygraph.isOK(point.canvasy)) { |
5d13ef68 | 1028 | if (stepPlot && prevX != null) { |
0599d13b NN |
1029 | // Draw a horizontal line to the start of the missing data |
1030 | ctx.beginPath(); | |
1031 | ctx.strokeStyle = color; | |
1032 | ctx.lineWidth = this.options.strokeWidth; | |
1033 | ctx.moveTo(prevX, prevY); | |
1034 | ctx.lineTo(point.canvasx, prevY); | |
1035 | ctx.stroke(); | |
1036 | } | |
80aaae18 DV |
1037 | // this will make us move to the next point, not draw a line to it. |
1038 | prevX = prevY = null; | |
1039 | } else { | |
1040 | // A point is "isolated" if it is non-null but both the previous | |
1041 | // and next points are null. | |
1042 | var isIsolated = (!prevX && (j == points.length - 1 || | |
e9fe4a2f | 1043 | !Dygraph.isOK(points[j+1].canvasy))); |
80aaae18 DV |
1044 | |
1045 | if (!prevX) { | |
1046 | prevX = point.canvasx; | |
1047 | prevY = point.canvasy; | |
1048 | } else { | |
46dde5f9 DV |
1049 | // TODO(danvk): figure out why this conditional is necessary. |
1050 | if (strokeWidth) { | |
1051 | ctx.beginPath(); | |
1052 | ctx.strokeStyle = color; | |
1053 | ctx.lineWidth = strokeWidth; | |
1054 | ctx.moveTo(prevX, prevY); | |
1055 | if (stepPlot) { | |
1056 | ctx.lineTo(point.canvasx, prevY); | |
1057 | } | |
1058 | prevX = point.canvasx; | |
1059 | prevY = point.canvasy; | |
1060 | ctx.lineTo(prevX, prevY); | |
1061 | ctx.stroke(); | |
afdc483f | 1062 | } |
80aaae18 DV |
1063 | } |
1064 | ||
1065 | if (drawPoints || isIsolated) { | |
1066 | ctx.beginPath(); | |
1067 | ctx.fillStyle = color; | |
7bf6a9fe DV |
1068 | ctx.arc(point.canvasx, point.canvasy, pointSize, |
1069 | 0, 2 * Math.PI, false); | |
80aaae18 DV |
1070 | ctx.fill(); |
1071 | } | |
1072 | } | |
1073 | } | |
1074 | } | |
1075 | } | |
6a1aa64f | 1076 | |
6a1aa64f DV |
1077 | context.restore(); |
1078 | }; |