| 1 | // Copyright 2006 Dan Vanderkam (danvdk@gmail.com) |
| 2 | // All Rights Reserved. |
| 3 | |
| 4 | /** |
| 5 | * @fileoverview Based on PlotKit, but modified to meet the needs of dygraphs. |
| 6 | * In particular, support for: |
| 7 | * - grid overlays |
| 8 | * - error bars |
| 9 | * - dygraphs attribute system |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * Creates a new DygraphLayout object. |
| 14 | * @param {Object} options Options for PlotKit.Layout |
| 15 | * @return {Object} The DygraphLayout object |
| 16 | */ |
| 17 | DygraphLayout = function(dygraph, options) { |
| 18 | this.dygraph_ = dygraph; |
| 19 | this.options = {}; // TODO(danvk): remove, use attr_ instead. |
| 20 | Dygraph.update(this.options, options ? options : {}); |
| 21 | this.datasets = new Array(); |
| 22 | this.annotations = new Array(); |
| 23 | }; |
| 24 | |
| 25 | DygraphLayout.prototype.attr_ = function(name) { |
| 26 | return this.dygraph_.attr_(name); |
| 27 | }; |
| 28 | |
| 29 | DygraphLayout.prototype.addDataset = function(setname, set_xy) { |
| 30 | this.datasets[setname] = set_xy; |
| 31 | }; |
| 32 | |
| 33 | DygraphLayout.prototype.setAnnotations = function(ann) { |
| 34 | // The Dygraph object's annotations aren't parsed. We parse them here and |
| 35 | // save a copy. |
| 36 | var parse = this.attr_('xValueParser'); |
| 37 | for (var i = 0; i < ann.length; i++) { |
| 38 | var a = {}; |
| 39 | if (!ann[i].xval && !ann[i].x) { |
| 40 | this.dygraph_.error("Annotations must have an 'x' property"); |
| 41 | return; |
| 42 | } |
| 43 | if (ann[i].icon && |
| 44 | !(ann[i].hasOwnProperty('width') && |
| 45 | ann[i].hasOwnProperty('height'))) { |
| 46 | this.dygraph_.error("Must set width and height when setting " + |
| 47 | "annotation.icon property"); |
| 48 | return; |
| 49 | } |
| 50 | Dygraph.update(a, ann[i]); |
| 51 | if (!a.xval) a.xval = parse(a.x); |
| 52 | this.annotations.push(a); |
| 53 | } |
| 54 | }; |
| 55 | |
| 56 | DygraphLayout.prototype.evaluate = function() { |
| 57 | this._evaluateLimits(); |
| 58 | this._evaluateLineCharts(); |
| 59 | this._evaluateLineTicks(); |
| 60 | this._evaluateAnnotations(); |
| 61 | }; |
| 62 | |
| 63 | DygraphLayout.prototype._evaluateLimits = function() { |
| 64 | this.minxval = this.maxxval = null; |
| 65 | if (this.options.dateWindow) { |
| 66 | this.minxval = this.options.dateWindow[0]; |
| 67 | this.maxxval = this.options.dateWindow[1]; |
| 68 | } else { |
| 69 | for (var name in this.datasets) { |
| 70 | if (!this.datasets.hasOwnProperty(name)) continue; |
| 71 | var series = this.datasets[name]; |
| 72 | var x1 = series[0][0]; |
| 73 | if (!this.minxval || x1 < this.minxval) this.minxval = x1; |
| 74 | |
| 75 | var x2 = series[series.length - 1][0]; |
| 76 | if (!this.maxxval || x2 > this.maxxval) this.maxxval = x2; |
| 77 | } |
| 78 | } |
| 79 | this.xrange = this.maxxval - this.minxval; |
| 80 | this.xscale = (this.xrange != 0 ? 1/this.xrange : 1.0); |
| 81 | |
| 82 | this.minyval = this.options.yAxis[0]; |
| 83 | this.maxyval = this.options.yAxis[1]; |
| 84 | this.yrange = this.maxyval - this.minyval; |
| 85 | this.yscale = (this.yrange != 0 ? 1/this.yrange : 1.0); |
| 86 | }; |
| 87 | |
| 88 | DygraphLayout.prototype._evaluateLineCharts = function() { |
| 89 | // add all the rects |
| 90 | this.points = new Array(); |
| 91 | for (var setName in this.datasets) { |
| 92 | if (!this.datasets.hasOwnProperty(setName)) continue; |
| 93 | |
| 94 | var dataset = this.datasets[setName]; |
| 95 | for (var j = 0; j < dataset.length; j++) { |
| 96 | var item = dataset[j]; |
| 97 | var point = { |
| 98 | // TODO(danvk): here |
| 99 | x: ((parseFloat(item[0]) - this.minxval) * this.xscale), |
| 100 | y: 1.0 - ((parseFloat(item[1]) - this.minyval) * this.yscale), |
| 101 | xval: parseFloat(item[0]), |
| 102 | yval: parseFloat(item[1]), |
| 103 | name: setName |
| 104 | }; |
| 105 | |
| 106 | this.points.push(point); |
| 107 | } |
| 108 | } |
| 109 | }; |
| 110 | |
| 111 | DygraphLayout.prototype._evaluateLineTicks = function() { |
| 112 | this.xticks = new Array(); |
| 113 | for (var i = 0; i < this.options.xTicks.length; i++) { |
| 114 | var tick = this.options.xTicks[i]; |
| 115 | var label = tick.label; |
| 116 | var pos = this.xscale * (tick.v - this.minxval); |
| 117 | if ((pos >= 0.0) && (pos <= 1.0)) { |
| 118 | this.xticks.push([pos, label]); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | this.yticks = new Array(); |
| 123 | for (var i = 0; i < this.options.yTicks.length; i++) { |
| 124 | var tick = this.options.yTicks[i]; |
| 125 | var label = tick.label; |
| 126 | var pos = 1.0 - (this.yscale * (tick.v - this.minyval)); |
| 127 | if ((pos >= 0.0) && (pos <= 1.0)) { |
| 128 | this.yticks.push([pos, label]); |
| 129 | } |
| 130 | } |
| 131 | }; |
| 132 | |
| 133 | |
| 134 | /** |
| 135 | * Behaves the same way as PlotKit.Layout, but also copies the errors |
| 136 | * @private |
| 137 | */ |
| 138 | DygraphLayout.prototype.evaluateWithError = function() { |
| 139 | this.evaluate(); |
| 140 | if (!this.options.errorBars) return; |
| 141 | |
| 142 | // Copy over the error terms |
| 143 | var i = 0; // index in this.points |
| 144 | for (var setName in this.datasets) { |
| 145 | if (!this.datasets.hasOwnProperty(setName)) continue; |
| 146 | var j = 0; |
| 147 | var dataset = this.datasets[setName]; |
| 148 | for (var j = 0; j < dataset.length; j++, i++) { |
| 149 | var item = dataset[j]; |
| 150 | var xv = parseFloat(item[0]); |
| 151 | var yv = parseFloat(item[1]); |
| 152 | |
| 153 | if (xv == this.points[i].xval && |
| 154 | yv == this.points[i].yval) { |
| 155 | this.points[i].errorMinus = parseFloat(item[2]); |
| 156 | this.points[i].errorPlus = parseFloat(item[3]); |
| 157 | } |
| 158 | } |
| 159 | } |
| 160 | }; |
| 161 | |
| 162 | DygraphLayout.prototype._evaluateAnnotations = function() { |
| 163 | // Add the annotations to the point to which they belong. |
| 164 | // Make a map from (setName, xval) to annotation for quick lookups. |
| 165 | var annotations = {}; |
| 166 | for (var i = 0; i < this.annotations.length; i++) { |
| 167 | var a = this.annotations[i]; |
| 168 | annotations[a.xval + "," + a.series] = a; |
| 169 | } |
| 170 | |
| 171 | this.annotated_points = []; |
| 172 | for (var i = 0; i < this.points.length; i++) { |
| 173 | var p = this.points[i]; |
| 174 | var k = p.xval + "," + p.name; |
| 175 | if (k in annotations) { |
| 176 | p.annotation = annotations[k]; |
| 177 | this.annotated_points.push(p); |
| 178 | } |
| 179 | } |
| 180 | }; |
| 181 | |
| 182 | /** |
| 183 | * Convenience function to remove all the data sets from a graph |
| 184 | */ |
| 185 | DygraphLayout.prototype.removeAllDatasets = function() { |
| 186 | delete this.datasets; |
| 187 | this.datasets = new Array(); |
| 188 | }; |
| 189 | |
| 190 | /** |
| 191 | * Change the values of various layout options |
| 192 | * @param {Object} new_options an associative array of new properties |
| 193 | */ |
| 194 | DygraphLayout.prototype.updateOptions = function(new_options) { |
| 195 | Dygraph.update(this.options, new_options ? new_options : {}); |
| 196 | }; |
| 197 | |
| 198 | // Subclass PlotKit.CanvasRenderer to add: |
| 199 | // 1. X/Y grid overlay |
| 200 | // 2. Ability to draw error bars (if required) |
| 201 | |
| 202 | /** |
| 203 | * Sets some PlotKit.CanvasRenderer options |
| 204 | * @param {Object} element The canvas to attach to |
| 205 | * @param {Layout} layout The DygraphLayout object for this graph. |
| 206 | * @param {Object} options Options to pass on to CanvasRenderer |
| 207 | */ |
| 208 | DygraphCanvasRenderer = function(dygraph, element, layout, options) { |
| 209 | // TODO(danvk): remove options, just use dygraph.attr_. |
| 210 | this.dygraph_ = dygraph; |
| 211 | |
| 212 | // default options |
| 213 | this.options = { |
| 214 | "strokeWidth": 0.5, |
| 215 | "drawXAxis": true, |
| 216 | "drawYAxis": true, |
| 217 | "axisLineColor": "black", |
| 218 | "axisLineWidth": 0.5, |
| 219 | "axisTickSize": 3, |
| 220 | "axisLabelColor": "black", |
| 221 | "axisLabelFont": "Arial", |
| 222 | "axisLabelFontSize": 9, |
| 223 | "axisLabelWidth": 50, |
| 224 | "drawYGrid": true, |
| 225 | "drawXGrid": true, |
| 226 | "gridLineColor": "rgb(128,128,128)", |
| 227 | "fillAlpha": 0.15, |
| 228 | "underlayCallback": null |
| 229 | }; |
| 230 | Dygraph.update(this.options, options); |
| 231 | |
| 232 | this.layout = layout; |
| 233 | this.element = element; |
| 234 | this.container = this.element.parentNode; |
| 235 | |
| 236 | this.height = this.element.height; |
| 237 | this.width = this.element.width; |
| 238 | |
| 239 | // --- check whether everything is ok before we return |
| 240 | if (!this.isIE && !(DygraphCanvasRenderer.isSupported(this.element))) |
| 241 | throw "Canvas is not supported."; |
| 242 | |
| 243 | // internal state |
| 244 | this.xlabels = new Array(); |
| 245 | this.ylabels = new Array(); |
| 246 | this.annotations = new Array(); |
| 247 | |
| 248 | this.area = { |
| 249 | x: this.options.yAxisLabelWidth + 2 * this.options.axisTickSize, |
| 250 | y: 0 |
| 251 | }; |
| 252 | this.area.w = this.width - this.area.x - this.options.rightGap; |
| 253 | this.area.h = this.height - this.options.axisLabelFontSize - |
| 254 | 2 * this.options.axisTickSize; |
| 255 | |
| 256 | this.container.style.position = "relative"; |
| 257 | this.container.style.width = this.width + "px"; |
| 258 | }; |
| 259 | |
| 260 | DygraphCanvasRenderer.prototype.clear = function() { |
| 261 | if (this.isIE) { |
| 262 | // VML takes a while to start up, so we just poll every this.IEDelay |
| 263 | try { |
| 264 | if (this.clearDelay) { |
| 265 | this.clearDelay.cancel(); |
| 266 | this.clearDelay = null; |
| 267 | } |
| 268 | var context = this.element.getContext("2d"); |
| 269 | } |
| 270 | catch (e) { |
| 271 | // TODO(danvk): this is broken, since MochiKit.Async is gone. |
| 272 | this.clearDelay = MochiKit.Async.wait(this.IEDelay); |
| 273 | this.clearDelay.addCallback(bind(this.clear, this)); |
| 274 | return; |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | var context = this.element.getContext("2d"); |
| 279 | context.clearRect(0, 0, this.width, this.height); |
| 280 | |
| 281 | for (var i = 0; i < this.xlabels.length; i++) { |
| 282 | var el = this.xlabels[i]; |
| 283 | el.parentNode.removeChild(el); |
| 284 | } |
| 285 | for (var i = 0; i < this.ylabels.length; i++) { |
| 286 | var el = this.ylabels[i]; |
| 287 | el.parentNode.removeChild(el); |
| 288 | } |
| 289 | for (var i = 0; i < this.annotations.length; i++) { |
| 290 | var el = this.annotations[i]; |
| 291 | el.parentNode.removeChild(el); |
| 292 | } |
| 293 | this.xlabels = new Array(); |
| 294 | this.ylabels = new Array(); |
| 295 | this.annotations = new Array(); |
| 296 | }; |
| 297 | |
| 298 | |
| 299 | DygraphCanvasRenderer.isSupported = function(canvasName) { |
| 300 | var canvas = null; |
| 301 | try { |
| 302 | if (typeof(canvasName) == 'undefined' || canvasName == null) |
| 303 | canvas = document.createElement("canvas"); |
| 304 | else |
| 305 | canvas = canvasName; |
| 306 | var context = canvas.getContext("2d"); |
| 307 | } |
| 308 | catch (e) { |
| 309 | var ie = navigator.appVersion.match(/MSIE (\d\.\d)/); |
| 310 | var opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1); |
| 311 | if ((!ie) || (ie[1] < 6) || (opera)) |
| 312 | return false; |
| 313 | return true; |
| 314 | } |
| 315 | return true; |
| 316 | }; |
| 317 | |
| 318 | /** |
| 319 | * Draw an X/Y grid on top of the existing plot |
| 320 | */ |
| 321 | DygraphCanvasRenderer.prototype.render = function() { |
| 322 | // Draw the new X/Y grid |
| 323 | var ctx = this.element.getContext("2d"); |
| 324 | |
| 325 | if (this.options.underlayCallback) { |
| 326 | this.options.underlayCallback(ctx, this.area, this.layout, this.dygraph_); |
| 327 | } |
| 328 | |
| 329 | if (this.options.drawYGrid) { |
| 330 | var ticks = this.layout.yticks; |
| 331 | ctx.save(); |
| 332 | ctx.strokeStyle = this.options.gridLineColor; |
| 333 | ctx.lineWidth = this.options.axisLineWidth; |
| 334 | for (var i = 0; i < ticks.length; i++) { |
| 335 | var x = this.area.x; |
| 336 | var y = this.area.y + ticks[i][0] * this.area.h; |
| 337 | ctx.beginPath(); |
| 338 | ctx.moveTo(x, y); |
| 339 | ctx.lineTo(x + this.area.w, y); |
| 340 | ctx.closePath(); |
| 341 | ctx.stroke(); |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | if (this.options.drawXGrid) { |
| 346 | var ticks = this.layout.xticks; |
| 347 | ctx.save(); |
| 348 | ctx.strokeStyle = this.options.gridLineColor; |
| 349 | ctx.lineWidth = this.options.axisLineWidth; |
| 350 | for (var i=0; i<ticks.length; i++) { |
| 351 | var x = this.area.x + ticks[i][0] * this.area.w; |
| 352 | var y = this.area.y + this.area.h; |
| 353 | ctx.beginPath(); |
| 354 | ctx.moveTo(x, y); |
| 355 | ctx.lineTo(x, this.area.y); |
| 356 | ctx.closePath(); |
| 357 | ctx.stroke(); |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | // Do the ordinary rendering, as before |
| 362 | this._renderLineChart(); |
| 363 | this._renderAxis(); |
| 364 | this._renderAnnotations(); |
| 365 | }; |
| 366 | |
| 367 | |
| 368 | DygraphCanvasRenderer.prototype._renderAxis = function() { |
| 369 | if (!this.options.drawXAxis && !this.options.drawYAxis) |
| 370 | return; |
| 371 | |
| 372 | var context = this.element.getContext("2d"); |
| 373 | |
| 374 | var labelStyle = { |
| 375 | "position": "absolute", |
| 376 | "fontSize": this.options.axisLabelFontSize + "px", |
| 377 | "zIndex": 10, |
| 378 | "color": this.options.axisLabelColor, |
| 379 | "width": this.options.axisLabelWidth + "px", |
| 380 | "overflow": "hidden" |
| 381 | }; |
| 382 | var makeDiv = function(txt) { |
| 383 | var div = document.createElement("div"); |
| 384 | for (var name in labelStyle) { |
| 385 | if (labelStyle.hasOwnProperty(name)) { |
| 386 | div.style[name] = labelStyle[name]; |
| 387 | } |
| 388 | } |
| 389 | div.appendChild(document.createTextNode(txt)); |
| 390 | return div; |
| 391 | }; |
| 392 | |
| 393 | // axis lines |
| 394 | context.save(); |
| 395 | context.strokeStyle = this.options.axisLineColor; |
| 396 | context.lineWidth = this.options.axisLineWidth; |
| 397 | |
| 398 | if (this.options.drawYAxis) { |
| 399 | if (this.layout.yticks && this.layout.yticks.length > 0) { |
| 400 | for (var i = 0; i < this.layout.yticks.length; i++) { |
| 401 | var tick = this.layout.yticks[i]; |
| 402 | if (typeof(tick) == "function") return; |
| 403 | var x = this.area.x; |
| 404 | var y = this.area.y + tick[0] * this.area.h; |
| 405 | context.beginPath(); |
| 406 | context.moveTo(x, y); |
| 407 | context.lineTo(x - this.options.axisTickSize, y); |
| 408 | context.closePath(); |
| 409 | context.stroke(); |
| 410 | |
| 411 | var label = makeDiv(tick[1]); |
| 412 | var top = (y - this.options.axisLabelFontSize / 2); |
| 413 | if (top < 0) top = 0; |
| 414 | |
| 415 | if (top + this.options.axisLabelFontSize + 3 > this.height) { |
| 416 | label.style.bottom = "0px"; |
| 417 | } else { |
| 418 | label.style.top = top + "px"; |
| 419 | } |
| 420 | label.style.left = "0px"; |
| 421 | label.style.textAlign = "right"; |
| 422 | label.style.width = this.options.yAxisLabelWidth + "px"; |
| 423 | this.container.appendChild(label); |
| 424 | this.ylabels.push(label); |
| 425 | } |
| 426 | |
| 427 | // The lowest tick on the y-axis often overlaps with the leftmost |
| 428 | // tick on the x-axis. Shift the bottom tick up a little bit to |
| 429 | // compensate if necessary. |
| 430 | var bottomTick = this.ylabels[0]; |
| 431 | var fontSize = this.options.axisLabelFontSize; |
| 432 | var bottom = parseInt(bottomTick.style.top) + fontSize; |
| 433 | if (bottom > this.height - fontSize) { |
| 434 | bottomTick.style.top = (parseInt(bottomTick.style.top) - |
| 435 | fontSize / 2) + "px"; |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | context.beginPath(); |
| 440 | context.moveTo(this.area.x, this.area.y); |
| 441 | context.lineTo(this.area.x, this.area.y + this.area.h); |
| 442 | context.closePath(); |
| 443 | context.stroke(); |
| 444 | } |
| 445 | |
| 446 | if (this.options.drawXAxis) { |
| 447 | if (this.layout.xticks) { |
| 448 | for (var i = 0; i < this.layout.xticks.length; i++) { |
| 449 | var tick = this.layout.xticks[i]; |
| 450 | if (typeof(dataset) == "function") return; |
| 451 | |
| 452 | var x = this.area.x + tick[0] * this.area.w; |
| 453 | var y = this.area.y + this.area.h; |
| 454 | context.beginPath(); |
| 455 | context.moveTo(x, y); |
| 456 | context.lineTo(x, y + this.options.axisTickSize); |
| 457 | context.closePath(); |
| 458 | context.stroke(); |
| 459 | |
| 460 | var label = makeDiv(tick[1]); |
| 461 | label.style.textAlign = "center"; |
| 462 | label.style.bottom = "0px"; |
| 463 | |
| 464 | var left = (x - this.options.axisLabelWidth/2); |
| 465 | if (left + this.options.axisLabelWidth > this.width) { |
| 466 | left = this.width - this.options.xAxisLabelWidth; |
| 467 | label.style.textAlign = "right"; |
| 468 | } |
| 469 | if (left < 0) { |
| 470 | left = 0; |
| 471 | label.style.textAlign = "left"; |
| 472 | } |
| 473 | |
| 474 | label.style.left = left + "px"; |
| 475 | label.style.width = this.options.xAxisLabelWidth + "px"; |
| 476 | this.container.appendChild(label); |
| 477 | this.xlabels.push(label); |
| 478 | } |
| 479 | } |
| 480 | |
| 481 | context.beginPath(); |
| 482 | context.moveTo(this.area.x, this.area.y + this.area.h); |
| 483 | context.lineTo(this.area.x + this.area.w, this.area.y + this.area.h); |
| 484 | context.closePath(); |
| 485 | context.stroke(); |
| 486 | } |
| 487 | |
| 488 | context.restore(); |
| 489 | }; |
| 490 | |
| 491 | |
| 492 | DygraphCanvasRenderer.prototype._renderAnnotations = function() { |
| 493 | var annotationStyle = { |
| 494 | "position": "absolute", |
| 495 | "fontSize": this.options.axisLabelFontSize + "px", |
| 496 | "zIndex": 10, |
| 497 | "overflow": "hidden" |
| 498 | }; |
| 499 | |
| 500 | var bindEvt = function(eventName, classEventName, p, self) { |
| 501 | return function(e) { |
| 502 | var a = p.annotation; |
| 503 | if (a.hasOwnProperty(eventName)) { |
| 504 | a[eventName](a, p, self.dygraph_, e); |
| 505 | } else if (self.dygraph_.attr_(classEventName)) { |
| 506 | self.dygraph_.attr_(classEventName)(a, p, self.dygraph_,e ); |
| 507 | } |
| 508 | }; |
| 509 | } |
| 510 | |
| 511 | // Get a list of point with annotations. |
| 512 | var points = this.layout.annotated_points; |
| 513 | for (var i = 0; i < points.length; i++) { |
| 514 | var p = points[i]; |
| 515 | if (p.canvasx < this.area.x || p.canvasx > this.area.x + this.area.w) { |
| 516 | continue; |
| 517 | } |
| 518 | |
| 519 | var a = p.annotation; |
| 520 | var tick_height = 6; |
| 521 | if (a.hasOwnProperty("tickHeight")) { |
| 522 | tick_height = a.tickHeight; |
| 523 | } |
| 524 | |
| 525 | var div = document.createElement("div"); |
| 526 | for (var name in annotationStyle) { |
| 527 | if (annotationStyle.hasOwnProperty(name)) { |
| 528 | div.style[name] = annotationStyle[name]; |
| 529 | } |
| 530 | } |
| 531 | if (!a.hasOwnProperty('icon')) { |
| 532 | div.className = "dygraphDefaultAnnotation"; |
| 533 | } |
| 534 | if (a.hasOwnProperty('cssClass')) { |
| 535 | div.className += " " + a.cssClass; |
| 536 | } |
| 537 | |
| 538 | var width = a.hasOwnProperty('width') ? a.width : 16; |
| 539 | var height = a.hasOwnProperty('height') ? a.height : 16; |
| 540 | if (a.hasOwnProperty('icon')) { |
| 541 | var img = document.createElement("img"); |
| 542 | img.src = a.icon; |
| 543 | img.width = width; |
| 544 | img.height = height; |
| 545 | div.appendChild(img); |
| 546 | } else if (p.annotation.hasOwnProperty('shortText')) { |
| 547 | div.appendChild(document.createTextNode(p.annotation.shortText)); |
| 548 | } |
| 549 | div.style.left = (p.canvasx - width / 2) + "px"; |
| 550 | if (a.attachAtBottom) { |
| 551 | div.style.top = (this.area.h - height - tick_height) + "px"; |
| 552 | } else { |
| 553 | div.style.top = (p.canvasy - height - tick_height) + "px"; |
| 554 | } |
| 555 | div.style.width = width + "px"; |
| 556 | div.style.height = height + "px"; |
| 557 | div.title = p.annotation.text; |
| 558 | div.style.color = this.colors[p.name]; |
| 559 | div.style.borderColor = this.colors[p.name]; |
| 560 | a.div = div; |
| 561 | |
| 562 | Dygraph.addEvent(div, 'click', |
| 563 | bindEvt('clickHandler', 'annotationClickHandler', p, this)); |
| 564 | Dygraph.addEvent(div, 'mouseover', |
| 565 | bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p, this)); |
| 566 | Dygraph.addEvent(div, 'mouseout', |
| 567 | bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p, this)); |
| 568 | Dygraph.addEvent(div, 'dblclick', |
| 569 | bindEvt('dblClickHandler', 'annotationDblClickHandler', p, this)); |
| 570 | |
| 571 | this.container.appendChild(div); |
| 572 | this.annotations.push(div); |
| 573 | |
| 574 | var ctx = this.element.getContext("2d"); |
| 575 | ctx.strokeStyle = this.colors[p.name]; |
| 576 | ctx.beginPath(); |
| 577 | if (!a.attachAtBottom) { |
| 578 | ctx.moveTo(p.canvasx, p.canvasy); |
| 579 | ctx.lineTo(p.canvasx, p.canvasy - 2 - tick_height); |
| 580 | } else { |
| 581 | ctx.moveTo(p.canvasx, this.area.h); |
| 582 | ctx.lineTo(p.canvasx, this.area.h - 2 - tick_height); |
| 583 | } |
| 584 | ctx.closePath(); |
| 585 | ctx.stroke(); |
| 586 | } |
| 587 | }; |
| 588 | |
| 589 | |
| 590 | /** |
| 591 | * Overrides the CanvasRenderer method to draw error bars |
| 592 | */ |
| 593 | DygraphCanvasRenderer.prototype._renderLineChart = function() { |
| 594 | var context = this.element.getContext("2d"); |
| 595 | var colorCount = this.options.colorScheme.length; |
| 596 | var colorScheme = this.options.colorScheme; |
| 597 | var fillAlpha = this.options.fillAlpha; |
| 598 | var errorBars = this.layout.options.errorBars; |
| 599 | var fillGraph = this.layout.options.fillGraph; |
| 600 | var stackedGraph = this.layout.options.stackedGraph; |
| 601 | var stepPlot = this.layout.options.stepPlot; |
| 602 | |
| 603 | var setNames = []; |
| 604 | for (var name in this.layout.datasets) { |
| 605 | if (this.layout.datasets.hasOwnProperty(name)) { |
| 606 | setNames.push(name); |
| 607 | } |
| 608 | } |
| 609 | var setCount = setNames.length; |
| 610 | |
| 611 | this.colors = {} |
| 612 | for (var i = 0; i < setCount; i++) { |
| 613 | this.colors[setNames[i]] = colorScheme[i % colorCount]; |
| 614 | } |
| 615 | |
| 616 | // Update Points |
| 617 | // TODO(danvk): here |
| 618 | for (var i = 0; i < this.layout.points.length; i++) { |
| 619 | var point = this.layout.points[i]; |
| 620 | point.canvasx = this.area.w * point.x + this.area.x; |
| 621 | point.canvasy = this.area.h * point.y + this.area.y; |
| 622 | } |
| 623 | |
| 624 | // create paths |
| 625 | var isOK = function(x) { return x && !isNaN(x); }; |
| 626 | |
| 627 | var ctx = context; |
| 628 | if (errorBars) { |
| 629 | if (fillGraph) { |
| 630 | this.dygraph_.warn("Can't use fillGraph option with error bars"); |
| 631 | } |
| 632 | |
| 633 | for (var i = 0; i < setCount; i++) { |
| 634 | var setName = setNames[i]; |
| 635 | var color = this.colors[setName]; |
| 636 | |
| 637 | // setup graphics context |
| 638 | ctx.save(); |
| 639 | var prevX = NaN; |
| 640 | var prevY = NaN; |
| 641 | var prevYs = [-1, -1]; |
| 642 | var yscale = this.layout.yscale; |
| 643 | // should be same color as the lines but only 15% opaque. |
| 644 | var rgb = new RGBColor(color); |
| 645 | var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + |
| 646 | fillAlpha + ')'; |
| 647 | ctx.fillStyle = err_color; |
| 648 | ctx.beginPath(); |
| 649 | for (var j = 0; j < this.layout.points.length; j++) { |
| 650 | var point = this.layout.points[j]; |
| 651 | if (point.name == setName) { |
| 652 | if (!isOK(point.y)) { |
| 653 | prevX = NaN; |
| 654 | continue; |
| 655 | } |
| 656 | |
| 657 | // TODO(danvk): here |
| 658 | if (stepPlot) { |
| 659 | var newYs = [ prevY - point.errorPlus * yscale, |
| 660 | prevY + point.errorMinus * yscale ]; |
| 661 | prevY = point.y; |
| 662 | } else { |
| 663 | var newYs = [ point.y - point.errorPlus * yscale, |
| 664 | point.y + point.errorMinus * yscale ]; |
| 665 | } |
| 666 | newYs[0] = this.area.h * newYs[0] + this.area.y; |
| 667 | newYs[1] = this.area.h * newYs[1] + this.area.y; |
| 668 | if (!isNaN(prevX)) { |
| 669 | if (stepPlot) { |
| 670 | ctx.moveTo(prevX, newYs[0]); |
| 671 | } else { |
| 672 | ctx.moveTo(prevX, prevYs[0]); |
| 673 | } |
| 674 | ctx.lineTo(point.canvasx, newYs[0]); |
| 675 | ctx.lineTo(point.canvasx, newYs[1]); |
| 676 | if (stepPlot) { |
| 677 | ctx.lineTo(prevX, newYs[1]); |
| 678 | } else { |
| 679 | ctx.lineTo(prevX, prevYs[1]); |
| 680 | } |
| 681 | ctx.closePath(); |
| 682 | } |
| 683 | prevYs = newYs; |
| 684 | prevX = point.canvasx; |
| 685 | } |
| 686 | } |
| 687 | ctx.fill(); |
| 688 | } |
| 689 | } else if (fillGraph) { |
| 690 | var axisY = 1.0 + this.layout.minyval * this.layout.yscale; |
| 691 | if (axisY < 0.0) axisY = 0.0; |
| 692 | else if (axisY > 1.0) axisY = 1.0; |
| 693 | axisY = this.area.h * axisY + this.area.y; |
| 694 | |
| 695 | var baseline = [] // for stacked graphs: baseline for filling |
| 696 | |
| 697 | // process sets in reverse order (needed for stacked graphs) |
| 698 | for (var i = setCount - 1; i >= 0; i--) { |
| 699 | var setName = setNames[i]; |
| 700 | var color = this.colors[setName]; |
| 701 | |
| 702 | // setup graphics context |
| 703 | ctx.save(); |
| 704 | var prevX = NaN; |
| 705 | var prevYs = [-1, -1]; |
| 706 | var yscale = this.layout.yscale; |
| 707 | // should be same color as the lines but only 15% opaque. |
| 708 | var rgb = new RGBColor(color); |
| 709 | var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + |
| 710 | fillAlpha + ')'; |
| 711 | ctx.fillStyle = err_color; |
| 712 | ctx.beginPath(); |
| 713 | for (var j = 0; j < this.layout.points.length; j++) { |
| 714 | var point = this.layout.points[j]; |
| 715 | if (point.name == setName) { |
| 716 | if (!isOK(point.y)) { |
| 717 | prevX = NaN; |
| 718 | continue; |
| 719 | } |
| 720 | var newYs; |
| 721 | if (stackedGraph) { |
| 722 | lastY = baseline[point.canvasx]; |
| 723 | if (lastY === undefined) lastY = axisY; |
| 724 | baseline[point.canvasx] = point.canvasy; |
| 725 | newYs = [ point.canvasy, lastY ]; |
| 726 | } else { |
| 727 | newYs = [ point.canvasy, axisY ]; |
| 728 | } |
| 729 | if (!isNaN(prevX)) { |
| 730 | ctx.moveTo(prevX, prevYs[0]); |
| 731 | if (stepPlot) { |
| 732 | ctx.lineTo(point.canvasx, prevYs[0]); |
| 733 | } else { |
| 734 | ctx.lineTo(point.canvasx, newYs[0]); |
| 735 | } |
| 736 | ctx.lineTo(point.canvasx, newYs[1]); |
| 737 | ctx.lineTo(prevX, prevYs[1]); |
| 738 | ctx.closePath(); |
| 739 | } |
| 740 | prevYs = newYs; |
| 741 | prevX = point.canvasx; |
| 742 | } |
| 743 | } |
| 744 | ctx.fill(); |
| 745 | } |
| 746 | } |
| 747 | |
| 748 | for (var i = 0; i < setCount; i++) { |
| 749 | var setName = setNames[i]; |
| 750 | var color = this.colors[setName]; |
| 751 | |
| 752 | // setup graphics context |
| 753 | context.save(); |
| 754 | var point = this.layout.points[0]; |
| 755 | var pointSize = this.dygraph_.attr_("pointSize"); |
| 756 | var prevX = null, prevY = null; |
| 757 | var drawPoints = this.dygraph_.attr_("drawPoints"); |
| 758 | var points = this.layout.points; |
| 759 | for (var j = 0; j < points.length; j++) { |
| 760 | var point = points[j]; |
| 761 | if (point.name == setName) { |
| 762 | if (!isOK(point.canvasy)) { |
| 763 | // this will make us move to the next point, not draw a line to it. |
| 764 | prevX = prevY = null; |
| 765 | } else { |
| 766 | // A point is "isolated" if it is non-null but both the previous |
| 767 | // and next points are null. |
| 768 | var isIsolated = (!prevX && (j == points.length - 1 || |
| 769 | !isOK(points[j+1].canvasy))); |
| 770 | |
| 771 | if (!prevX) { |
| 772 | prevX = point.canvasx; |
| 773 | prevY = point.canvasy; |
| 774 | } else { |
| 775 | ctx.beginPath(); |
| 776 | ctx.strokeStyle = color; |
| 777 | ctx.lineWidth = this.options.strokeWidth; |
| 778 | ctx.moveTo(prevX, prevY); |
| 779 | if (stepPlot) { |
| 780 | ctx.lineTo(point.canvasx, prevY); |
| 781 | } |
| 782 | prevX = point.canvasx; |
| 783 | prevY = point.canvasy; |
| 784 | ctx.lineTo(prevX, prevY); |
| 785 | ctx.stroke(); |
| 786 | } |
| 787 | |
| 788 | if (drawPoints || isIsolated) { |
| 789 | ctx.beginPath(); |
| 790 | ctx.fillStyle = color; |
| 791 | ctx.arc(point.canvasx, point.canvasy, pointSize, |
| 792 | 0, 2 * Math.PI, false); |
| 793 | ctx.fill(); |
| 794 | } |
| 795 | } |
| 796 | } |
| 797 | } |
| 798 | } |
| 799 | |
| 800 | context.restore(); |
| 801 | }; |