| 1 | // Copyright 2006 Dan Vanderkam (danvdk@gmail.com) |
| 2 | // All Rights Reserved. |
| 3 | |
| 4 | /** |
| 5 | * @fileoverview Creates an interactive, zoomable graph based on a CSV file or |
| 6 | * string. Dygraph can handle multiple series with or without error bars. The |
| 7 | * date/value ranges will be automatically set. Dygraph uses the |
| 8 | * <canvas> tag, so it only works in FF1.5+. |
| 9 | * @author danvdk@gmail.com (Dan Vanderkam) |
| 10 | |
| 11 | Usage: |
| 12 | <div id="graphdiv" style="width:800px; height:500px;"></div> |
| 13 | <script type="text/javascript"> |
| 14 | new Dygraph(document.getElementById("graphdiv"), |
| 15 | "datafile.csv", // CSV file with headers |
| 16 | { }); // options |
| 17 | </script> |
| 18 | |
| 19 | The CSV file is of the form |
| 20 | |
| 21 | Date,SeriesA,SeriesB,SeriesC |
| 22 | YYYYMMDD,A1,B1,C1 |
| 23 | YYYYMMDD,A2,B2,C2 |
| 24 | |
| 25 | If the 'errorBars' option is set in the constructor, the input should be of |
| 26 | the form |
| 27 | |
| 28 | Date,SeriesA,SeriesB,... |
| 29 | YYYYMMDD,A1,sigmaA1,B1,sigmaB1,... |
| 30 | YYYYMMDD,A2,sigmaA2,B2,sigmaB2,... |
| 31 | |
| 32 | If the 'fractions' option is set, the input should be of the form: |
| 33 | |
| 34 | Date,SeriesA,SeriesB,... |
| 35 | YYYYMMDD,A1/B1,A2/B2,... |
| 36 | YYYYMMDD,A1/B1,A2/B2,... |
| 37 | |
| 38 | And error bars will be calculated automatically using a binomial distribution. |
| 39 | |
| 40 | For further documentation and examples, see http://www.danvk.org/dygraphs |
| 41 | |
| 42 | */ |
| 43 | |
| 44 | /** |
| 45 | * An interactive, zoomable graph |
| 46 | * @param {String | Function} file A file containing CSV data or a function that |
| 47 | * returns this data. The expected format for each line is |
| 48 | * YYYYMMDD,val1,val2,... or, if attrs.errorBars is set, |
| 49 | * YYYYMMDD,val1,stddev1,val2,stddev2,... |
| 50 | * @param {Object} attrs Various other attributes, e.g. errorBars determines |
| 51 | * whether the input data contains error ranges. |
| 52 | */ |
| 53 | Dygraph = function(div, data, opts) { |
| 54 | if (arguments.length > 0) { |
| 55 | if (arguments.length == 4) { |
| 56 | // Old versions of dygraphs took in the series labels as a constructor |
| 57 | // parameter. This doesn't make sense anymore, but it's easy to continue |
| 58 | // to support this usage. |
| 59 | this.warn("Using deprecated four-argument dygraph constructor"); |
| 60 | this.__old_init__(div, data, arguments[2], arguments[3]); |
| 61 | } else { |
| 62 | this.__init__(div, data, opts); |
| 63 | } |
| 64 | } |
| 65 | }; |
| 66 | |
| 67 | Dygraph.NAME = "Dygraph"; |
| 68 | Dygraph.VERSION = "1.2"; |
| 69 | Dygraph.__repr__ = function() { |
| 70 | return "[" + this.NAME + " " + this.VERSION + "]"; |
| 71 | }; |
| 72 | Dygraph.toString = function() { |
| 73 | return this.__repr__(); |
| 74 | }; |
| 75 | |
| 76 | // Various default values |
| 77 | Dygraph.DEFAULT_ROLL_PERIOD = 1; |
| 78 | Dygraph.DEFAULT_WIDTH = 480; |
| 79 | Dygraph.DEFAULT_HEIGHT = 320; |
| 80 | Dygraph.AXIS_LINE_WIDTH = 0.3; |
| 81 | |
| 82 | // Default attribute values. |
| 83 | Dygraph.DEFAULT_ATTRS = { |
| 84 | highlightCircleSize: 3, |
| 85 | pixelsPerXLabel: 60, |
| 86 | pixelsPerYLabel: 30, |
| 87 | |
| 88 | labelsDivWidth: 250, |
| 89 | labelsDivStyles: { |
| 90 | // TODO(danvk): move defaults from createStatusMessage_ here. |
| 91 | }, |
| 92 | labelsSeparateLines: false, |
| 93 | labelsKMB: false, |
| 94 | |
| 95 | strokeWidth: 1.0, |
| 96 | |
| 97 | axisTickSize: 3, |
| 98 | axisLabelFontSize: 14, |
| 99 | xAxisLabelWidth: 50, |
| 100 | yAxisLabelWidth: 50, |
| 101 | rightGap: 5, |
| 102 | |
| 103 | showRoller: false, |
| 104 | xValueFormatter: Dygraph.dateString_, |
| 105 | xValueParser: Dygraph.dateParser, |
| 106 | xTicker: Dygraph.dateTicker, |
| 107 | |
| 108 | sigma: 2.0, |
| 109 | errorBars: false, |
| 110 | fractions: false, |
| 111 | wilsonInterval: true, // only relevant if fractions is true |
| 112 | customBars: false |
| 113 | }; |
| 114 | |
| 115 | // Various logging levels. |
| 116 | Dygraph.DEBUG = 1; |
| 117 | Dygraph.INFO = 2; |
| 118 | Dygraph.WARNING = 3; |
| 119 | Dygraph.ERROR = 3; |
| 120 | |
| 121 | Dygraph.prototype.__old_init__ = function(div, file, labels, attrs) { |
| 122 | // Labels is no longer a constructor parameter, since it's typically set |
| 123 | // directly from the data source. It also conains a name for the x-axis, |
| 124 | // which the previous constructor form did not. |
| 125 | if (labels != null) { |
| 126 | var new_labels = ["Date"]; |
| 127 | for (var i = 0; i < labels.length; i++) new_labels.push(labels[i]); |
| 128 | MochiKit.Base.update(attrs, { 'labels': new_labels }); |
| 129 | } |
| 130 | this.__init__(div, file, attrs); |
| 131 | }; |
| 132 | |
| 133 | /** |
| 134 | * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit |
| 135 | * and interaction <canvas> inside of it. See the constructor for details |
| 136 | * on the parameters. |
| 137 | * @param {String | Function} file Source data |
| 138 | * @param {Array.<String>} labels Names of the data series |
| 139 | * @param {Object} attrs Miscellaneous other options |
| 140 | * @private |
| 141 | */ |
| 142 | Dygraph.prototype.__init__ = function(div, file, attrs) { |
| 143 | // Support two-argument constructor |
| 144 | if (attrs == null) { attrs = {}; } |
| 145 | |
| 146 | // Copy the important bits into the object |
| 147 | // TODO(danvk): most of these should just stay in the attrs_ dictionary. |
| 148 | this.maindiv_ = div; |
| 149 | this.file_ = file; |
| 150 | this.rollPeriod_ = attrs.rollPeriod || Dygraph.DEFAULT_ROLL_PERIOD; |
| 151 | this.previousVerticalX_ = -1; |
| 152 | this.fractions_ = attrs.fractions || false; |
| 153 | this.dateWindow_ = attrs.dateWindow || null; |
| 154 | this.valueRange_ = attrs.valueRange || null; |
| 155 | this.wilsonInterval_ = attrs.wilsonInterval || true; |
| 156 | |
| 157 | // Clear the div. This ensure that, if multiple dygraphs are passed the same |
| 158 | // div, then only one will be drawn. |
| 159 | div.innerHTML = ""; |
| 160 | |
| 161 | // If the div isn't already sized then give it a default size. |
| 162 | if (div.style.width == '') { |
| 163 | div.style.width = Dygraph.DEFAULT_WIDTH + "px"; |
| 164 | } |
| 165 | if (div.style.height == '') { |
| 166 | div.style.height = Dygraph.DEFAULT_HEIGHT + "px"; |
| 167 | } |
| 168 | this.width_ = parseInt(div.style.width, 10); |
| 169 | this.height_ = parseInt(div.style.height, 10); |
| 170 | |
| 171 | // Dygraphs has many options, some of which interact with one another. |
| 172 | // To keep track of everything, we maintain two sets of options: |
| 173 | // |
| 174 | // this.user_attrs_ only options explicitly set by the user. |
| 175 | // this.attrs_ defaults, options derived from user_attrs_, data. |
| 176 | // |
| 177 | // Options are then accessed this.attr_('attr'), which first looks at |
| 178 | // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent |
| 179 | // defaults without overriding behavior that the user specifically asks for. |
| 180 | this.user_attrs_ = {}; |
| 181 | MochiKit.Base.update(this.user_attrs_, attrs); |
| 182 | |
| 183 | this.attrs_ = {}; |
| 184 | MochiKit.Base.update(this.attrs_, Dygraph.DEFAULT_ATTRS); |
| 185 | |
| 186 | // Make a note of whether labels will be pulled from the CSV file. |
| 187 | this.labelsFromCSV_ = (this.attr_("labels") == null); |
| 188 | |
| 189 | // Create the containing DIV and other interactive elements |
| 190 | this.createInterface_(); |
| 191 | |
| 192 | // Create the PlotKit grapher |
| 193 | // TODO(danvk): why does the Layout need its own set of options? |
| 194 | this.layoutOptions_ = { 'errorBars': (this.attr_("errorBars") || |
| 195 | this.attr_("customBars")), |
| 196 | 'xOriginIsZero': false }; |
| 197 | MochiKit.Base.update(this.layoutOptions_, this.attrs_); |
| 198 | MochiKit.Base.update(this.layoutOptions_, this.user_attrs_); |
| 199 | |
| 200 | this.layout_ = new DygraphLayout(this, this.layoutOptions_); |
| 201 | |
| 202 | // TODO(danvk): why does the Renderer need its own set of options? |
| 203 | this.renderOptions_ = { colorScheme: this.colors_, |
| 204 | strokeColor: null, |
| 205 | axisLineWidth: Dygraph.AXIS_LINE_WIDTH }; |
| 206 | MochiKit.Base.update(this.renderOptions_, this.attrs_); |
| 207 | MochiKit.Base.update(this.renderOptions_, this.user_attrs_); |
| 208 | this.plotter_ = new DygraphCanvasRenderer(this, |
| 209 | this.hidden_, this.layout_, |
| 210 | this.renderOptions_); |
| 211 | |
| 212 | this.createStatusMessage_(); |
| 213 | this.createRollInterface_(); |
| 214 | this.createDragInterface_(); |
| 215 | |
| 216 | // connect(window, 'onload', this, function(e) { this.start_(); }); |
| 217 | this.start_(); |
| 218 | }; |
| 219 | |
| 220 | Dygraph.prototype.attr_ = function(name) { |
| 221 | if (typeof(this.user_attrs_[name]) != 'undefined') { |
| 222 | return this.user_attrs_[name]; |
| 223 | } else if (typeof(this.attrs_[name]) != 'undefined') { |
| 224 | return this.attrs_[name]; |
| 225 | } else { |
| 226 | return null; |
| 227 | } |
| 228 | }; |
| 229 | |
| 230 | // TODO(danvk): any way I can get the line numbers to be this.warn call? |
| 231 | Dygraph.prototype.log = function(severity, message) { |
| 232 | if (typeof(console) != 'undefined') { |
| 233 | switch (severity) { |
| 234 | case Dygraph.DEBUG: |
| 235 | console.debug('dygraphs: ' + message); |
| 236 | break; |
| 237 | case Dygraph.INFO: |
| 238 | console.info('dygraphs: ' + message); |
| 239 | break; |
| 240 | case Dygraph.WARNING: |
| 241 | console.warn('dygraphs: ' + message); |
| 242 | break; |
| 243 | case Dygraph.ERROR: |
| 244 | console.error('dygraphs: ' + message); |
| 245 | break; |
| 246 | } |
| 247 | } |
| 248 | } |
| 249 | Dygraph.prototype.info = function(message) { |
| 250 | this.log(Dygraph.INFO, message); |
| 251 | } |
| 252 | Dygraph.prototype.warn = function(message) { |
| 253 | this.log(Dygraph.WARNING, message); |
| 254 | } |
| 255 | Dygraph.prototype.error = function(message) { |
| 256 | this.log(Dygraph.ERROR, message); |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * Returns the current rolling period, as set by the user or an option. |
| 261 | * @return {Number} The number of days in the rolling window |
| 262 | */ |
| 263 | Dygraph.prototype.rollPeriod = function() { |
| 264 | return this.rollPeriod_; |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * Generates interface elements for the Dygraph: a containing div, a div to |
| 269 | * display the current point, and a textbox to adjust the rolling average |
| 270 | * period. |
| 271 | * @private |
| 272 | */ |
| 273 | Dygraph.prototype.createInterface_ = function() { |
| 274 | // Create the all-enclosing graph div |
| 275 | var enclosing = this.maindiv_; |
| 276 | |
| 277 | this.graphDiv = MochiKit.DOM.DIV( { style: { 'width': this.width_ + "px", |
| 278 | 'height': this.height_ + "px" |
| 279 | }}); |
| 280 | appendChildNodes(enclosing, this.graphDiv); |
| 281 | |
| 282 | // Create the canvas to store |
| 283 | // We need to subtract out some space for the x- and y-axis labels. |
| 284 | // For the x-axis: |
| 285 | // - remove from height: (axisTickSize + height of tick label) |
| 286 | // height of tick label == axisLabelFontSize? |
| 287 | // - remove from width: axisLabelWidth / 2 (maybe on both ends) |
| 288 | // For the y-axis: |
| 289 | // - remove axisLabelFontSize from the top |
| 290 | // - remove axisTickSize from the left |
| 291 | |
| 292 | var canvas = MochiKit.DOM.CANVAS; |
| 293 | this.canvas_ = canvas( { style: { 'position': 'absolute' }, |
| 294 | width: this.width_, |
| 295 | height: this.height_ |
| 296 | }); |
| 297 | appendChildNodes(this.graphDiv, this.canvas_); |
| 298 | |
| 299 | this.hidden_ = this.createPlotKitCanvas_(this.canvas_); |
| 300 | connect(this.hidden_, 'onmousemove', this, function(e) { this.mouseMove_(e) }); |
| 301 | connect(this.hidden_, 'onmouseout', this, function(e) { this.mouseOut_(e) }); |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on |
| 306 | * this particular canvas. All Dygraph work is done on this.canvas_. |
| 307 | * @param {Object} canvas The Dygraph canvas over which to overlay the plot |
| 308 | * @return {Object} The newly-created canvas |
| 309 | * @private |
| 310 | */ |
| 311 | Dygraph.prototype.createPlotKitCanvas_ = function(canvas) { |
| 312 | var h = document.createElement("canvas"); |
| 313 | h.style.position = "absolute"; |
| 314 | h.style.top = canvas.style.top; |
| 315 | h.style.left = canvas.style.left; |
| 316 | h.width = this.width_; |
| 317 | h.height = this.height_; |
| 318 | MochiKit.DOM.appendChildNodes(this.graphDiv, h); |
| 319 | return h; |
| 320 | }; |
| 321 | |
| 322 | /** |
| 323 | * Generate a set of distinct colors for the data series. This is done with a |
| 324 | * color wheel. Saturation/Value are customizable, and the hue is |
| 325 | * equally-spaced around the color wheel. If a custom set of colors is |
| 326 | * specified, that is used instead. |
| 327 | * @private |
| 328 | */ |
| 329 | Dygraph.prototype.setColors_ = function() { |
| 330 | // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do |
| 331 | // away with this.renderOptions_. |
| 332 | var num = this.attr_("labels").length - 1; |
| 333 | this.colors_ = []; |
| 334 | var colors = this.attr_('colors'); |
| 335 | if (!colors) { |
| 336 | var sat = this.attr_('colorSaturation') || 1.0; |
| 337 | var val = this.attr_('colorValue') || 0.5; |
| 338 | for (var i = 1; i <= num; i++) { |
| 339 | var hue = (1.0*i/(1+num)); |
| 340 | this.colors_.push( MochiKit.Color.Color.fromHSV(hue, sat, val) ); |
| 341 | } |
| 342 | } else { |
| 343 | for (var i = 0; i < num; i++) { |
| 344 | var colorStr = colors[i % colors.length]; |
| 345 | this.colors_.push( MochiKit.Color.Color.fromString(colorStr) ); |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | // TODO(danvk): update this w/r/t/ the new options system. |
| 350 | this.renderOptions_.colorScheme = this.colors_; |
| 351 | MochiKit.Base.update(this.plotter_.options, this.renderOptions_); |
| 352 | MochiKit.Base.update(this.layoutOptions_, this.user_attrs_); |
| 353 | MochiKit.Base.update(this.layoutOptions_, this.attrs_); |
| 354 | } |
| 355 | |
| 356 | /** |
| 357 | * Create the div that contains information on the selected point(s) |
| 358 | * This goes in the top right of the canvas, unless an external div has already |
| 359 | * been specified. |
| 360 | * @private |
| 361 | */ |
| 362 | Dygraph.prototype.createStatusMessage_ = function(){ |
| 363 | if (!this.attr_("labelsDiv")) { |
| 364 | var divWidth = this.attr_('labelsDivWidth'); |
| 365 | var messagestyle = { "style": { |
| 366 | "position": "absolute", |
| 367 | "fontSize": "14px", |
| 368 | "zIndex": 10, |
| 369 | "width": divWidth + "px", |
| 370 | "top": "0px", |
| 371 | "left": (this.width_ - divWidth - 2) + "px", |
| 372 | "background": "white", |
| 373 | "textAlign": "left", |
| 374 | "overflow": "hidden"}}; |
| 375 | MochiKit.Base.update(messagestyle["style"], this.attr_('labelsDivStyles')); |
| 376 | var div = MochiKit.DOM.DIV(messagestyle); |
| 377 | MochiKit.DOM.appendChildNodes(this.graphDiv, div); |
| 378 | this.attrs_.labelsDiv = div; |
| 379 | } |
| 380 | }; |
| 381 | |
| 382 | /** |
| 383 | * Create the text box to adjust the averaging period |
| 384 | * @return {Object} The newly-created text box |
| 385 | * @private |
| 386 | */ |
| 387 | Dygraph.prototype.createRollInterface_ = function() { |
| 388 | var display = this.attr_('showRoller') ? "block" : "none"; |
| 389 | var textAttr = { "type": "text", |
| 390 | "size": "2", |
| 391 | "value": this.rollPeriod_, |
| 392 | "style": { "position": "absolute", |
| 393 | "zIndex": 10, |
| 394 | "top": (this.plotter_.area.h - 25) + "px", |
| 395 | "left": (this.plotter_.area.x + 1) + "px", |
| 396 | "display": display } |
| 397 | }; |
| 398 | var roller = MochiKit.DOM.INPUT(textAttr); |
| 399 | var pa = this.graphDiv; |
| 400 | MochiKit.DOM.appendChildNodes(pa, roller); |
| 401 | connect(roller, 'onchange', this, |
| 402 | function() { this.adjustRoll(roller.value); }); |
| 403 | return roller; |
| 404 | } |
| 405 | |
| 406 | /** |
| 407 | * Set up all the mouse handlers needed to capture dragging behavior for zoom |
| 408 | * events. Uses MochiKit.Signal to attach all the event handlers. |
| 409 | * @private |
| 410 | */ |
| 411 | Dygraph.prototype.createDragInterface_ = function() { |
| 412 | var self = this; |
| 413 | |
| 414 | // Tracks whether the mouse is down right now |
| 415 | var mouseDown = false; |
| 416 | var dragStartX = null; |
| 417 | var dragStartY = null; |
| 418 | var dragEndX = null; |
| 419 | var dragEndY = null; |
| 420 | var prevEndX = null; |
| 421 | |
| 422 | // Utility function to convert page-wide coordinates to canvas coords |
| 423 | var px = 0; |
| 424 | var py = 0; |
| 425 | var getX = function(e) { return e.mouse().page.x - px }; |
| 426 | var getY = function(e) { return e.mouse().page.y - py }; |
| 427 | |
| 428 | // Draw zoom rectangles when the mouse is down and the user moves around |
| 429 | connect(this.hidden_, 'onmousemove', function(event) { |
| 430 | if (mouseDown) { |
| 431 | dragEndX = getX(event); |
| 432 | dragEndY = getY(event); |
| 433 | |
| 434 | self.drawZoomRect_(dragStartX, dragEndX, prevEndX); |
| 435 | prevEndX = dragEndX; |
| 436 | } |
| 437 | }); |
| 438 | |
| 439 | // Track the beginning of drag events |
| 440 | connect(this.hidden_, 'onmousedown', function(event) { |
| 441 | mouseDown = true; |
| 442 | px = PlotKit.Base.findPosX(self.canvas_); |
| 443 | py = PlotKit.Base.findPosY(self.canvas_); |
| 444 | dragStartX = getX(event); |
| 445 | dragStartY = getY(event); |
| 446 | }); |
| 447 | |
| 448 | // If the user releases the mouse button during a drag, but not over the |
| 449 | // canvas, then it doesn't count as a zooming action. |
| 450 | connect(document, 'onmouseup', this, function(event) { |
| 451 | if (mouseDown) { |
| 452 | mouseDown = false; |
| 453 | dragStartX = null; |
| 454 | dragStartY = null; |
| 455 | } |
| 456 | }); |
| 457 | |
| 458 | // Temporarily cancel the dragging event when the mouse leaves the graph |
| 459 | connect(this.hidden_, 'onmouseout', this, function(event) { |
| 460 | if (mouseDown) { |
| 461 | dragEndX = null; |
| 462 | dragEndY = null; |
| 463 | } |
| 464 | }); |
| 465 | |
| 466 | // If the mouse is released on the canvas during a drag event, then it's a |
| 467 | // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels) |
| 468 | connect(this.hidden_, 'onmouseup', this, function(event) { |
| 469 | if (mouseDown) { |
| 470 | mouseDown = false; |
| 471 | dragEndX = getX(event); |
| 472 | dragEndY = getY(event); |
| 473 | var regionWidth = Math.abs(dragEndX - dragStartX); |
| 474 | var regionHeight = Math.abs(dragEndY - dragStartY); |
| 475 | |
| 476 | if (regionWidth < 2 && regionHeight < 2 && |
| 477 | self.attr_('clickCallback') != null && |
| 478 | self.lastx_ != undefined) { |
| 479 | // TODO(danvk): pass along more info about the point. |
| 480 | self.attr_('clickCallback')(event, new Date(self.lastx_)); |
| 481 | } |
| 482 | |
| 483 | if (regionWidth >= 10) { |
| 484 | self.doZoom_(Math.min(dragStartX, dragEndX), |
| 485 | Math.max(dragStartX, dragEndX)); |
| 486 | } else { |
| 487 | self.canvas_.getContext("2d").clearRect(0, 0, |
| 488 | self.canvas_.width, |
| 489 | self.canvas_.height); |
| 490 | } |
| 491 | |
| 492 | dragStartX = null; |
| 493 | dragStartY = null; |
| 494 | } |
| 495 | }); |
| 496 | |
| 497 | // Double-clicking zooms back out |
| 498 | connect(this.hidden_, 'ondblclick', this, function(event) { |
| 499 | self.dateWindow_ = null; |
| 500 | self.drawGraph_(self.rawData_); |
| 501 | var minDate = self.rawData_[0][0]; |
| 502 | var maxDate = self.rawData_[self.rawData_.length - 1][0]; |
| 503 | if (self.attr_("zoomCallback")) { |
| 504 | self.attr_("zoomCallback")(minDate, maxDate); |
| 505 | } |
| 506 | }); |
| 507 | }; |
| 508 | |
| 509 | /** |
| 510 | * Draw a gray zoom rectangle over the desired area of the canvas. Also clears |
| 511 | * up any previous zoom rectangles that were drawn. This could be optimized to |
| 512 | * avoid extra redrawing, but it's tricky to avoid interactions with the status |
| 513 | * dots. |
| 514 | * @param {Number} startX The X position where the drag started, in canvas |
| 515 | * coordinates. |
| 516 | * @param {Number} endX The current X position of the drag, in canvas coords. |
| 517 | * @param {Number} prevEndX The value of endX on the previous call to this |
| 518 | * function. Used to avoid excess redrawing |
| 519 | * @private |
| 520 | */ |
| 521 | Dygraph.prototype.drawZoomRect_ = function(startX, endX, prevEndX) { |
| 522 | var ctx = this.canvas_.getContext("2d"); |
| 523 | |
| 524 | // Clean up from the previous rect if necessary |
| 525 | if (prevEndX) { |
| 526 | ctx.clearRect(Math.min(startX, prevEndX), 0, |
| 527 | Math.abs(startX - prevEndX), this.height_); |
| 528 | } |
| 529 | |
| 530 | // Draw a light-grey rectangle to show the new viewing area |
| 531 | if (endX && startX) { |
| 532 | ctx.fillStyle = "rgba(128,128,128,0.33)"; |
| 533 | ctx.fillRect(Math.min(startX, endX), 0, |
| 534 | Math.abs(endX - startX), this.height_); |
| 535 | } |
| 536 | }; |
| 537 | |
| 538 | /** |
| 539 | * Zoom to something containing [lowX, highX]. These are pixel coordinates |
| 540 | * in the canvas. The exact zoom window may be slightly larger if there are no |
| 541 | * data points near lowX or highX. This function redraws the graph. |
| 542 | * @param {Number} lowX The leftmost pixel value that should be visible. |
| 543 | * @param {Number} highX The rightmost pixel value that should be visible. |
| 544 | * @private |
| 545 | */ |
| 546 | Dygraph.prototype.doZoom_ = function(lowX, highX) { |
| 547 | // Find the earliest and latest dates contained in this canvasx range. |
| 548 | var points = this.layout_.points; |
| 549 | var minDate = null; |
| 550 | var maxDate = null; |
| 551 | // Find the nearest [minDate, maxDate] that contains [lowX, highX] |
| 552 | for (var i = 0; i < points.length; i++) { |
| 553 | var cx = points[i].canvasx; |
| 554 | var x = points[i].xval; |
| 555 | if (cx < lowX && (minDate == null || x > minDate)) minDate = x; |
| 556 | if (cx > highX && (maxDate == null || x < maxDate)) maxDate = x; |
| 557 | } |
| 558 | // Use the extremes if either is missing |
| 559 | if (minDate == null) minDate = points[0].xval; |
| 560 | if (maxDate == null) maxDate = points[points.length-1].xval; |
| 561 | |
| 562 | this.dateWindow_ = [minDate, maxDate]; |
| 563 | this.drawGraph_(this.rawData_); |
| 564 | if (this.attr_("zoomCallback")) { |
| 565 | this.attr_("zoomCallback")(minDate, maxDate); |
| 566 | } |
| 567 | }; |
| 568 | |
| 569 | /** |
| 570 | * When the mouse moves in the canvas, display information about a nearby data |
| 571 | * point and draw dots over those points in the data series. This function |
| 572 | * takes care of cleanup of previously-drawn dots. |
| 573 | * @param {Object} event The mousemove event from the browser. |
| 574 | * @private |
| 575 | */ |
| 576 | Dygraph.prototype.mouseMove_ = function(event) { |
| 577 | var canvasx = event.mouse().page.x - PlotKit.Base.findPosX(this.hidden_); |
| 578 | var points = this.layout_.points; |
| 579 | |
| 580 | var lastx = -1; |
| 581 | var lasty = -1; |
| 582 | |
| 583 | // Loop through all the points and find the date nearest to our current |
| 584 | // location. |
| 585 | var minDist = 1e+100; |
| 586 | var idx = -1; |
| 587 | for (var i = 0; i < points.length; i++) { |
| 588 | var dist = Math.abs(points[i].canvasx - canvasx); |
| 589 | if (dist > minDist) break; |
| 590 | minDist = dist; |
| 591 | idx = i; |
| 592 | } |
| 593 | if (idx >= 0) lastx = points[idx].xval; |
| 594 | // Check that you can really highlight the last day's data |
| 595 | if (canvasx > points[points.length-1].canvasx) |
| 596 | lastx = points[points.length-1].xval; |
| 597 | |
| 598 | // Extract the points we've selected |
| 599 | var selPoints = []; |
| 600 | for (var i = 0; i < points.length; i++) { |
| 601 | if (points[i].xval == lastx) { |
| 602 | selPoints.push(points[i]); |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | // Clear the previously drawn vertical, if there is one |
| 607 | var circleSize = this.attr_('highlightCircleSize'); |
| 608 | var ctx = this.canvas_.getContext("2d"); |
| 609 | if (this.previousVerticalX_ >= 0) { |
| 610 | var px = this.previousVerticalX_; |
| 611 | ctx.clearRect(px - circleSize - 1, 0, 2 * circleSize + 2, this.height_); |
| 612 | } |
| 613 | |
| 614 | var isOK = function(x) { return x && !isNaN(x); }; |
| 615 | |
| 616 | if (selPoints.length > 0) { |
| 617 | var canvasx = selPoints[0].canvasx; |
| 618 | |
| 619 | // Set the status message to indicate the selected point(s) |
| 620 | var replace = this.attr_('xValueFormatter')(lastx, this) + ":"; |
| 621 | var clen = this.colors_.length; |
| 622 | for (var i = 0; i < selPoints.length; i++) { |
| 623 | if (!isOK(selPoints[i].canvasy)) continue; |
| 624 | if (this.attr_("labelsSeparateLines")) { |
| 625 | replace += "<br/>"; |
| 626 | } |
| 627 | var point = selPoints[i]; |
| 628 | replace += " <b><font color='" + this.colors_[i%clen].toHexString() + "'>" |
| 629 | + point.name + "</font></b>:" |
| 630 | + this.round_(point.yval, 2); |
| 631 | } |
| 632 | this.attr_("labelsDiv").innerHTML = replace; |
| 633 | |
| 634 | // Save last x position for callbacks. |
| 635 | this.lastx_ = lastx; |
| 636 | |
| 637 | // Draw colored circles over the center of each selected point |
| 638 | ctx.save() |
| 639 | for (var i = 0; i < selPoints.length; i++) { |
| 640 | if (!isOK(selPoints[i%clen].canvasy)) continue; |
| 641 | ctx.beginPath(); |
| 642 | ctx.fillStyle = this.colors_[i%clen].toRGBString(); |
| 643 | ctx.arc(canvasx, selPoints[i%clen].canvasy, circleSize, 0, 360, false); |
| 644 | ctx.fill(); |
| 645 | } |
| 646 | ctx.restore(); |
| 647 | |
| 648 | this.previousVerticalX_ = canvasx; |
| 649 | } |
| 650 | }; |
| 651 | |
| 652 | /** |
| 653 | * The mouse has left the canvas. Clear out whatever artifacts remain |
| 654 | * @param {Object} event the mouseout event from the browser. |
| 655 | * @private |
| 656 | */ |
| 657 | Dygraph.prototype.mouseOut_ = function(event) { |
| 658 | // Get rid of the overlay data |
| 659 | var ctx = this.canvas_.getContext("2d"); |
| 660 | ctx.clearRect(0, 0, this.width_, this.height_); |
| 661 | this.attr_("labelsDiv").innerHTML = ""; |
| 662 | }; |
| 663 | |
| 664 | Dygraph.zeropad = function(x) { |
| 665 | if (x < 10) return "0" + x; else return "" + x; |
| 666 | } |
| 667 | |
| 668 | /** |
| 669 | * Return a string version of the hours, minutes and seconds portion of a date. |
| 670 | * @param {Number} date The JavaScript date (ms since epoch) |
| 671 | * @return {String} A time of the form "HH:MM:SS" |
| 672 | * @private |
| 673 | */ |
| 674 | Dygraph.prototype.hmsString_ = function(date) { |
| 675 | var zeropad = Dygraph.zeropad; |
| 676 | var d = new Date(date); |
| 677 | if (d.getSeconds()) { |
| 678 | return zeropad(d.getHours()) + ":" + |
| 679 | zeropad(d.getMinutes()) + ":" + |
| 680 | zeropad(d.getSeconds()); |
| 681 | } else if (d.getMinutes()) { |
| 682 | return zeropad(d.getHours()) + ":" + zeropad(d.getMinutes()); |
| 683 | } else { |
| 684 | return zeropad(d.getHours()); |
| 685 | } |
| 686 | } |
| 687 | |
| 688 | /** |
| 689 | * Convert a JS date (millis since epoch) to YYYY/MM/DD |
| 690 | * @param {Number} date The JavaScript date (ms since epoch) |
| 691 | * @return {String} A date of the form "YYYY/MM/DD" |
| 692 | * @private |
| 693 | * TODO(danvk): why is this part of the prototype? |
| 694 | */ |
| 695 | Dygraph.dateString_ = function(date, self) { |
| 696 | var zeropad = Dygraph.zeropad; |
| 697 | var d = new Date(date); |
| 698 | |
| 699 | // Get the year: |
| 700 | var year = "" + d.getFullYear(); |
| 701 | // Get a 0 padded month string |
| 702 | var month = zeropad(d.getMonth() + 1); //months are 0-offset, sigh |
| 703 | // Get a 0 padded day string |
| 704 | var day = zeropad(d.getDate()); |
| 705 | |
| 706 | var ret = ""; |
| 707 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); |
| 708 | if (frac) ret = " " + self.hmsString_(date); |
| 709 | |
| 710 | return year + "/" + month + "/" + day + ret; |
| 711 | }; |
| 712 | |
| 713 | /** |
| 714 | * Round a number to the specified number of digits past the decimal point. |
| 715 | * @param {Number} num The number to round |
| 716 | * @param {Number} places The number of decimals to which to round |
| 717 | * @return {Number} The rounded number |
| 718 | * @private |
| 719 | */ |
| 720 | Dygraph.prototype.round_ = function(num, places) { |
| 721 | var shift = Math.pow(10, places); |
| 722 | return Math.round(num * shift)/shift; |
| 723 | }; |
| 724 | |
| 725 | /** |
| 726 | * Fires when there's data available to be graphed. |
| 727 | * @param {String} data Raw CSV data to be plotted |
| 728 | * @private |
| 729 | */ |
| 730 | Dygraph.prototype.loadedEvent_ = function(data) { |
| 731 | this.rawData_ = this.parseCSV_(data); |
| 732 | this.drawGraph_(this.rawData_); |
| 733 | }; |
| 734 | |
| 735 | Dygraph.prototype.months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| 736 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; |
| 737 | Dygraph.prototype.quarters = ["Jan", "Apr", "Jul", "Oct"]; |
| 738 | |
| 739 | /** |
| 740 | * Add ticks on the x-axis representing years, months, quarters, weeks, or days |
| 741 | * @private |
| 742 | */ |
| 743 | Dygraph.prototype.addXTicks_ = function() { |
| 744 | // Determine the correct ticks scale on the x-axis: quarterly, monthly, ... |
| 745 | var startDate, endDate; |
| 746 | if (this.dateWindow_) { |
| 747 | startDate = this.dateWindow_[0]; |
| 748 | endDate = this.dateWindow_[1]; |
| 749 | } else { |
| 750 | startDate = this.rawData_[0][0]; |
| 751 | endDate = this.rawData_[this.rawData_.length - 1][0]; |
| 752 | } |
| 753 | |
| 754 | var xTicks = this.attr_('xTicker')(startDate, endDate, this); |
| 755 | this.layout_.updateOptions({xTicks: xTicks}); |
| 756 | }; |
| 757 | |
| 758 | // Time granularity enumeration |
| 759 | Dygraph.SECONDLY = 0; |
| 760 | Dygraph.TEN_SECONDLY = 1; |
| 761 | Dygraph.THIRTY_SECONDLY = 2; |
| 762 | Dygraph.MINUTELY = 3; |
| 763 | Dygraph.TEN_MINUTELY = 4; |
| 764 | Dygraph.THIRTY_MINUTELY = 5; |
| 765 | Dygraph.HOURLY = 6; |
| 766 | Dygraph.SIX_HOURLY = 7; |
| 767 | Dygraph.DAILY = 8; |
| 768 | Dygraph.WEEKLY = 9; |
| 769 | Dygraph.MONTHLY = 10; |
| 770 | Dygraph.QUARTERLY = 11; |
| 771 | Dygraph.BIANNUAL = 12; |
| 772 | Dygraph.ANNUAL = 13; |
| 773 | Dygraph.DECADAL = 14; |
| 774 | Dygraph.NUM_GRANULARITIES = 15; |
| 775 | |
| 776 | Dygraph.SHORT_SPACINGS = []; |
| 777 | Dygraph.SHORT_SPACINGS[Dygraph.SECONDLY] = 1000 * 1; |
| 778 | Dygraph.SHORT_SPACINGS[Dygraph.TEN_SECONDLY] = 1000 * 10; |
| 779 | Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_SECONDLY] = 1000 * 30; |
| 780 | Dygraph.SHORT_SPACINGS[Dygraph.MINUTELY] = 1000 * 60; |
| 781 | Dygraph.SHORT_SPACINGS[Dygraph.TEN_MINUTELY] = 1000 * 60 * 10; |
| 782 | Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_MINUTELY] = 1000 * 60 * 30; |
| 783 | Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600; |
| 784 | Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600 * 6; |
| 785 | Dygraph.SHORT_SPACINGS[Dygraph.DAILY] = 1000 * 86400; |
| 786 | Dygraph.SHORT_SPACINGS[Dygraph.WEEKLY] = 1000 * 604800; |
| 787 | |
| 788 | // NumXTicks() |
| 789 | // |
| 790 | // If we used this time granularity, how many ticks would there be? |
| 791 | // This is only an approximation, but it's generally good enough. |
| 792 | // |
| 793 | Dygraph.prototype.NumXTicks = function(start_time, end_time, granularity) { |
| 794 | if (granularity < Dygraph.MONTHLY) { |
| 795 | // Generate one tick mark for every fixed interval of time. |
| 796 | var spacing = Dygraph.SHORT_SPACINGS[granularity]; |
| 797 | return Math.floor(0.5 + 1.0 * (end_time - start_time) / spacing); |
| 798 | } else { |
| 799 | var year_mod = 1; // e.g. to only print one point every 10 years. |
| 800 | var num_months = 12; |
| 801 | if (granularity == Dygraph.QUARTERLY) num_months = 3; |
| 802 | if (granularity == Dygraph.BIANNUAL) num_months = 2; |
| 803 | if (granularity == Dygraph.ANNUAL) num_months = 1; |
| 804 | if (granularity == Dygraph.DECADAL) { num_months = 1; year_mod = 10; } |
| 805 | |
| 806 | var msInYear = 365.2524 * 24 * 3600 * 1000; |
| 807 | var num_years = 1.0 * (end_time - start_time) / msInYear; |
| 808 | return Math.floor(0.5 + 1.0 * num_years * num_months / year_mod); |
| 809 | } |
| 810 | }; |
| 811 | |
| 812 | // GetXAxis() |
| 813 | // |
| 814 | // Construct an x-axis of nicely-formatted times on meaningful boundaries |
| 815 | // (e.g. 'Jan 09' rather than 'Jan 22, 2009'). |
| 816 | // |
| 817 | // Returns an array containing {v: millis, label: label} dictionaries. |
| 818 | // |
| 819 | Dygraph.prototype.GetXAxis = function(start_time, end_time, granularity) { |
| 820 | var ticks = []; |
| 821 | if (granularity < Dygraph.MONTHLY) { |
| 822 | // Generate one tick mark for every fixed interval of time. |
| 823 | var spacing = Dygraph.SHORT_SPACINGS[granularity]; |
| 824 | var format = '%d%b'; // e.g. "1 Jan" |
| 825 | // TODO(danvk): be smarter about making sure this really hits a "nice" time. |
| 826 | if (granularity < Dygraph.HOURLY) { |
| 827 | start_time = spacing * Math.floor(0.5 + start_time / spacing); |
| 828 | } |
| 829 | for (var t = start_time; t <= end_time; t += spacing) { |
| 830 | var d = new Date(t); |
| 831 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); |
| 832 | if (frac == 0 || granularity >= Dygraph.DAILY) { |
| 833 | // the extra hour covers DST problems. |
| 834 | ticks.push({ v:t, label: new Date(t + 3600*1000).strftime(format) }); |
| 835 | } else { |
| 836 | ticks.push({ v:t, label: this.hmsString_(t) }); |
| 837 | } |
| 838 | } |
| 839 | } else { |
| 840 | // Display a tick mark on the first of a set of months of each year. |
| 841 | // Years get a tick mark iff y % year_mod == 0. This is useful for |
| 842 | // displaying a tick mark once every 10 years, say, on long time scales. |
| 843 | var months; |
| 844 | var year_mod = 1; // e.g. to only print one point every 10 years. |
| 845 | |
| 846 | if (granularity == Dygraph.MONTHLY) { |
| 847 | months = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ]; |
| 848 | } else if (granularity == Dygraph.QUARTERLY) { |
| 849 | months = [ 0, 3, 6, 9 ]; |
| 850 | } else if (granularity == Dygraph.BIANNUAL) { |
| 851 | months = [ 0, 6 ]; |
| 852 | } else if (granularity == Dygraph.ANNUAL) { |
| 853 | months = [ 0 ]; |
| 854 | } else if (granularity == Dygraph.DECADAL) { |
| 855 | months = [ 0 ]; |
| 856 | year_mod = 10; |
| 857 | } |
| 858 | |
| 859 | var start_year = new Date(start_time).getFullYear(); |
| 860 | var end_year = new Date(end_time).getFullYear(); |
| 861 | var zeropad = Dygraph.zeropad; |
| 862 | for (var i = start_year; i <= end_year; i++) { |
| 863 | if (i % year_mod != 0) continue; |
| 864 | for (var j = 0; j < months.length; j++) { |
| 865 | var date_str = i + "/" + zeropad(1 + months[j]) + "/01"; |
| 866 | var t = Date.parse(date_str); |
| 867 | if (t < start_time || t > end_time) continue; |
| 868 | ticks.push({ v:t, label: new Date(t).strftime('%b %y') }); |
| 869 | } |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | return ticks; |
| 874 | }; |
| 875 | |
| 876 | |
| 877 | /** |
| 878 | * Add ticks to the x-axis based on a date range. |
| 879 | * @param {Number} startDate Start of the date window (millis since epoch) |
| 880 | * @param {Number} endDate End of the date window (millis since epoch) |
| 881 | * @return {Array.<Object>} Array of {label, value} tuples. |
| 882 | * @public |
| 883 | */ |
| 884 | Dygraph.dateTicker = function(startDate, endDate, self) { |
| 885 | var chosen = -1; |
| 886 | for (var i = 0; i < Dygraph.NUM_GRANULARITIES; i++) { |
| 887 | var num_ticks = self.NumXTicks(startDate, endDate, i); |
| 888 | if (self.width_ / num_ticks >= self.attr_('pixelsPerXLabel')) { |
| 889 | chosen = i; |
| 890 | break; |
| 891 | } |
| 892 | } |
| 893 | |
| 894 | if (chosen >= 0) { |
| 895 | return self.GetXAxis(startDate, endDate, chosen); |
| 896 | } else { |
| 897 | // TODO(danvk): signal error. |
| 898 | } |
| 899 | }; |
| 900 | |
| 901 | /** |
| 902 | * Add ticks when the x axis has numbers on it (instead of dates) |
| 903 | * @param {Number} startDate Start of the date window (millis since epoch) |
| 904 | * @param {Number} endDate End of the date window (millis since epoch) |
| 905 | * @return {Array.<Object>} Array of {label, value} tuples. |
| 906 | * @public |
| 907 | */ |
| 908 | Dygraph.numericTicks = function(minV, maxV, self) { |
| 909 | // Basic idea: |
| 910 | // Try labels every 1, 2, 5, 10, 20, 50, 100, etc. |
| 911 | // Calculate the resulting tick spacing (i.e. this.height_ / nTicks). |
| 912 | // The first spacing greater than pixelsPerYLabel is what we use. |
| 913 | var mults = [1, 2, 5]; |
| 914 | var scale, low_val, high_val, nTicks; |
| 915 | // TODO(danvk): make it possible to set this for x- and y-axes independently. |
| 916 | var pixelsPerTick = self.attr_('pixelsPerYLabel'); |
| 917 | for (var i = -10; i < 50; i++) { |
| 918 | var base_scale = Math.pow(10, i); |
| 919 | for (var j = 0; j < mults.length; j++) { |
| 920 | scale = base_scale * mults[j]; |
| 921 | low_val = Math.floor(minV / scale) * scale; |
| 922 | high_val = Math.ceil(maxV / scale) * scale; |
| 923 | nTicks = (high_val - low_val) / scale; |
| 924 | var spacing = self.height_ / nTicks; |
| 925 | // wish I could break out of both loops at once... |
| 926 | if (spacing > pixelsPerTick) break; |
| 927 | } |
| 928 | if (spacing > pixelsPerTick) break; |
| 929 | } |
| 930 | |
| 931 | // Construct labels for the ticks |
| 932 | var ticks = []; |
| 933 | for (var i = 0; i < nTicks; i++) { |
| 934 | var tickV = low_val + i * scale; |
| 935 | var label = self.round_(tickV, 2); |
| 936 | if (self.attr_("labelsKMB")) { |
| 937 | var k = 1000; |
| 938 | if (tickV >= k*k*k) { |
| 939 | label = self.round_(tickV/(k*k*k), 1) + "B"; |
| 940 | } else if (tickV >= k*k) { |
| 941 | label = self.round_(tickV/(k*k), 1) + "M"; |
| 942 | } else if (tickV >= k) { |
| 943 | label = self.round_(tickV/k, 1) + "K"; |
| 944 | } |
| 945 | } |
| 946 | ticks.push( {label: label, v: tickV} ); |
| 947 | } |
| 948 | return ticks; |
| 949 | }; |
| 950 | |
| 951 | /** |
| 952 | * Adds appropriate ticks on the y-axis |
| 953 | * @param {Number} minY The minimum Y value in the data set |
| 954 | * @param {Number} maxY The maximum Y value in the data set |
| 955 | * @private |
| 956 | */ |
| 957 | Dygraph.prototype.addYTicks_ = function(minY, maxY) { |
| 958 | // Set the number of ticks so that the labels are human-friendly. |
| 959 | // TODO(danvk): make this an attribute as well. |
| 960 | var ticks = Dygraph.numericTicks(minY, maxY, this); |
| 961 | this.layout_.updateOptions( { yAxis: [minY, maxY], |
| 962 | yTicks: ticks } ); |
| 963 | }; |
| 964 | |
| 965 | // Computes the range of the data series (including confidence intervals). |
| 966 | // series is either [ [x1, y1], [x2, y2], ... ] or |
| 967 | // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ... |
| 968 | // Returns [low, high] |
| 969 | Dygraph.prototype.extremeValues_ = function(series) { |
| 970 | var minY = null, maxY = null; |
| 971 | |
| 972 | var bars = this.attr_("errorBars") || this.attr_("customBars"); |
| 973 | if (bars) { |
| 974 | // With custom bars, maxY is the max of the high values. |
| 975 | for (var j = 0; j < series.length; j++) { |
| 976 | var y = series[j][1][0]; |
| 977 | if (!y) continue; |
| 978 | var low = y - series[j][1][1]; |
| 979 | var high = y + series[j][1][2]; |
| 980 | if (low > y) low = y; // this can happen with custom bars, |
| 981 | if (high < y) high = y; // e.g. in tests/custom-bars.html |
| 982 | if (maxY == null || high > maxY) { |
| 983 | maxY = high; |
| 984 | } |
| 985 | if (minY == null || low < minY) { |
| 986 | minY = low; |
| 987 | } |
| 988 | } |
| 989 | } else { |
| 990 | for (var j = 0; j < series.length; j++) { |
| 991 | var y = series[j][1]; |
| 992 | if (!y) continue; |
| 993 | if (maxY == null || y > maxY) { |
| 994 | maxY = y; |
| 995 | } |
| 996 | if (minY == null || y < minY) { |
| 997 | minY = y; |
| 998 | } |
| 999 | } |
| 1000 | } |
| 1001 | |
| 1002 | return [minY, maxY]; |
| 1003 | }; |
| 1004 | |
| 1005 | /** |
| 1006 | * Update the graph with new data. Data is in the format |
| 1007 | * [ [date1, val1, val2, ...], [date2, val1, val2, ...] if errorBars=false |
| 1008 | * or, if errorBars=true, |
| 1009 | * [ [date1, [val1,stddev1], [val2,stddev2], ...], [date2, ...], ...] |
| 1010 | * @param {Array.<Object>} data The data (see above) |
| 1011 | * @private |
| 1012 | */ |
| 1013 | Dygraph.prototype.drawGraph_ = function(data) { |
| 1014 | var minY = null, maxY = null; |
| 1015 | this.layout_.removeAllDatasets(); |
| 1016 | this.setColors_(); |
| 1017 | this.attrs_['pointSize'] = 0.5 * this.attr_('highlightCircleSize'); |
| 1018 | |
| 1019 | // Loop over all fields in the dataset |
| 1020 | for (var i = 1; i < data[0].length; i++) { |
| 1021 | var series = []; |
| 1022 | for (var j = 0; j < data.length; j++) { |
| 1023 | var date = data[j][0]; |
| 1024 | series[j] = [date, data[j][i]]; |
| 1025 | } |
| 1026 | series = this.rollingAverage(series, this.rollPeriod_); |
| 1027 | |
| 1028 | // Prune down to the desired range, if necessary (for zooming) |
| 1029 | var bars = this.attr_("errorBars") || this.attr_("customBars"); |
| 1030 | if (this.dateWindow_) { |
| 1031 | var low = this.dateWindow_[0]; |
| 1032 | var high= this.dateWindow_[1]; |
| 1033 | var pruned = []; |
| 1034 | for (var k = 0; k < series.length; k++) { |
| 1035 | if (series[k][0] >= low && series[k][0] <= high) { |
| 1036 | pruned.push(series[k]); |
| 1037 | } |
| 1038 | } |
| 1039 | series = pruned; |
| 1040 | } |
| 1041 | |
| 1042 | var extremes = this.extremeValues_(series); |
| 1043 | var thisMinY = extremes[0]; |
| 1044 | var thisMaxY = extremes[1]; |
| 1045 | if (!minY || thisMinY < minY) minY = thisMinY; |
| 1046 | if (!maxY || thisMaxY > maxY) maxY = thisMaxY; |
| 1047 | |
| 1048 | if (bars) { |
| 1049 | var vals = []; |
| 1050 | for (var j=0; j<series.length; j++) |
| 1051 | vals[j] = [series[j][0], |
| 1052 | series[j][1][0], series[j][1][1], series[j][1][2]]; |
| 1053 | this.layout_.addDataset(this.attr_("labels")[i], vals); |
| 1054 | } else { |
| 1055 | this.layout_.addDataset(this.attr_("labels")[i], series); |
| 1056 | } |
| 1057 | } |
| 1058 | |
| 1059 | // Use some heuristics to come up with a good maxY value, unless it's been |
| 1060 | // set explicitly by the user. |
| 1061 | if (this.valueRange_ != null) { |
| 1062 | this.addYTicks_(this.valueRange_[0], this.valueRange_[1]); |
| 1063 | } else { |
| 1064 | // Add some padding and round up to an integer to be human-friendly. |
| 1065 | var span = maxY - minY; |
| 1066 | var maxAxisY = maxY + 0.1 * span; |
| 1067 | var minAxisY = minY - 0.1 * span; |
| 1068 | |
| 1069 | // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense. |
| 1070 | if (minAxisY < 0 && minY >= 0) minAxisY = 0; |
| 1071 | if (maxAxisY > 0 && maxY <= 0) maxAxisY = 0; |
| 1072 | |
| 1073 | if (this.attr_("includeZero")) { |
| 1074 | if (maxY < 0) maxAxisY = 0; |
| 1075 | if (minY > 0) minAxisY = 0; |
| 1076 | } |
| 1077 | |
| 1078 | this.addYTicks_(minAxisY, maxAxisY); |
| 1079 | } |
| 1080 | |
| 1081 | this.addXTicks_(); |
| 1082 | |
| 1083 | // Tell PlotKit to use this new data and render itself |
| 1084 | this.layout_.evaluateWithError(); |
| 1085 | this.plotter_.clear(); |
| 1086 | this.plotter_.render(); |
| 1087 | this.canvas_.getContext('2d').clearRect(0, 0, |
| 1088 | this.canvas_.width, this.canvas_.height); |
| 1089 | }; |
| 1090 | |
| 1091 | /** |
| 1092 | * Calculates the rolling average of a data set. |
| 1093 | * If originalData is [label, val], rolls the average of those. |
| 1094 | * If originalData is [label, [, it's interpreted as [value, stddev] |
| 1095 | * and the roll is returned in the same form, with appropriately reduced |
| 1096 | * stddev for each value. |
| 1097 | * Note that this is where fractional input (i.e. '5/10') is converted into |
| 1098 | * decimal values. |
| 1099 | * @param {Array} originalData The data in the appropriate format (see above) |
| 1100 | * @param {Number} rollPeriod The number of days over which to average the data |
| 1101 | */ |
| 1102 | Dygraph.prototype.rollingAverage = function(originalData, rollPeriod) { |
| 1103 | if (originalData.length < 2) |
| 1104 | return originalData; |
| 1105 | var rollPeriod = Math.min(rollPeriod, originalData.length - 1); |
| 1106 | var rollingData = []; |
| 1107 | var sigma = this.attr_("sigma"); |
| 1108 | |
| 1109 | if (this.fractions_) { |
| 1110 | var num = 0; |
| 1111 | var den = 0; // numerator/denominator |
| 1112 | var mult = 100.0; |
| 1113 | for (var i = 0; i < originalData.length; i++) { |
| 1114 | num += originalData[i][1][0]; |
| 1115 | den += originalData[i][1][1]; |
| 1116 | if (i - rollPeriod >= 0) { |
| 1117 | num -= originalData[i - rollPeriod][1][0]; |
| 1118 | den -= originalData[i - rollPeriod][1][1]; |
| 1119 | } |
| 1120 | |
| 1121 | var date = originalData[i][0]; |
| 1122 | var value = den ? num / den : 0.0; |
| 1123 | if (this.attr_("errorBars")) { |
| 1124 | if (this.wilsonInterval_) { |
| 1125 | // For more details on this confidence interval, see: |
| 1126 | // http://en.wikipedia.org/wiki/Binomial_confidence_interval |
| 1127 | if (den) { |
| 1128 | var p = value < 0 ? 0 : value, n = den; |
| 1129 | var pm = sigma * Math.sqrt(p*(1-p)/n + sigma*sigma/(4*n*n)); |
| 1130 | var denom = 1 + sigma * sigma / den; |
| 1131 | var low = (p + sigma * sigma / (2 * den) - pm) / denom; |
| 1132 | var high = (p + sigma * sigma / (2 * den) + pm) / denom; |
| 1133 | rollingData[i] = [date, |
| 1134 | [p * mult, (p - low) * mult, (high - p) * mult]]; |
| 1135 | } else { |
| 1136 | rollingData[i] = [date, [0, 0, 0]]; |
| 1137 | } |
| 1138 | } else { |
| 1139 | var stddev = den ? sigma * Math.sqrt(value * (1 - value) / den) : 1.0; |
| 1140 | rollingData[i] = [date, [mult * value, mult * stddev, mult * stddev]]; |
| 1141 | } |
| 1142 | } else { |
| 1143 | rollingData[i] = [date, mult * value]; |
| 1144 | } |
| 1145 | } |
| 1146 | } else if (this.attr_("customBars")) { |
| 1147 | var low = 0; |
| 1148 | var mid = 0; |
| 1149 | var high = 0; |
| 1150 | var count = 0; |
| 1151 | for (var i = 0; i < originalData.length; i++) { |
| 1152 | var data = originalData[i][1]; |
| 1153 | var y = data[1]; |
| 1154 | rollingData[i] = [originalData[i][0], [y, y - data[0], data[2] - y]]; |
| 1155 | |
| 1156 | low += data[0]; |
| 1157 | mid += y; |
| 1158 | high += data[2]; |
| 1159 | count += 1; |
| 1160 | if (i - rollPeriod >= 0) { |
| 1161 | var prev = originalData[i - rollPeriod]; |
| 1162 | low -= prev[1][0]; |
| 1163 | mid -= prev[1][1]; |
| 1164 | high -= prev[1][2]; |
| 1165 | count -= 1; |
| 1166 | } |
| 1167 | rollingData[i] = [originalData[i][0], [ 1.0 * mid / count, |
| 1168 | 1.0 * (mid - low) / count, |
| 1169 | 1.0 * (high - mid) / count ]]; |
| 1170 | } |
| 1171 | } else { |
| 1172 | // Calculate the rolling average for the first rollPeriod - 1 points where |
| 1173 | // there is not enough data to roll over the full number of days |
| 1174 | var num_init_points = Math.min(rollPeriod - 1, originalData.length - 2); |
| 1175 | if (!this.attr_("errorBars")){ |
| 1176 | if (rollPeriod == 1) { |
| 1177 | return originalData; |
| 1178 | } |
| 1179 | |
| 1180 | for (var i = 0; i < originalData.length; i++) { |
| 1181 | var sum = 0; |
| 1182 | var num_ok = 0; |
| 1183 | for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) { |
| 1184 | var y = originalData[j][1]; |
| 1185 | if (!y || isNaN(y)) continue; |
| 1186 | num_ok++; |
| 1187 | sum += originalData[j][1]; |
| 1188 | } |
| 1189 | if (num_ok) { |
| 1190 | rollingData[i] = [originalData[i][0], sum / num_ok]; |
| 1191 | } else { |
| 1192 | rollingData[i] = [originalData[i][0], null]; |
| 1193 | } |
| 1194 | } |
| 1195 | |
| 1196 | } else { |
| 1197 | for (var i = 0; i < originalData.length; i++) { |
| 1198 | var sum = 0; |
| 1199 | var variance = 0; |
| 1200 | var num_ok = 0; |
| 1201 | for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) { |
| 1202 | var y = originalData[j][1][0]; |
| 1203 | if (!y || isNaN(y)) continue; |
| 1204 | num_ok++; |
| 1205 | sum += originalData[j][1][0]; |
| 1206 | variance += Math.pow(originalData[j][1][1], 2); |
| 1207 | } |
| 1208 | if (num_ok) { |
| 1209 | var stddev = Math.sqrt(variance) / num_ok; |
| 1210 | rollingData[i] = [originalData[i][0], |
| 1211 | [sum / num_ok, sigma * stddev, sigma * stddev]]; |
| 1212 | } else { |
| 1213 | rollingData[i] = [originalData[i][0], [null, null, null]]; |
| 1214 | } |
| 1215 | } |
| 1216 | } |
| 1217 | } |
| 1218 | |
| 1219 | return rollingData; |
| 1220 | }; |
| 1221 | |
| 1222 | /** |
| 1223 | * Parses a date, returning the number of milliseconds since epoch. This can be |
| 1224 | * passed in as an xValueParser in the Dygraph constructor. |
| 1225 | * TODO(danvk): enumerate formats that this understands. |
| 1226 | * @param {String} A date in YYYYMMDD format. |
| 1227 | * @return {Number} Milliseconds since epoch. |
| 1228 | * @public |
| 1229 | */ |
| 1230 | Dygraph.dateParser = function(dateStr, self) { |
| 1231 | var dateStrSlashed; |
| 1232 | var d; |
| 1233 | if (dateStr.length == 10 && dateStr.search("-") != -1) { // e.g. '2009-07-12' |
| 1234 | dateStrSlashed = dateStr.replace("-", "/", "g"); |
| 1235 | while (dateStrSlashed.search("-") != -1) { |
| 1236 | dateStrSlashed = dateStrSlashed.replace("-", "/"); |
| 1237 | } |
| 1238 | d = Date.parse(dateStrSlashed); |
| 1239 | } else if (dateStr.length == 8) { // e.g. '20090712' |
| 1240 | // TODO(danvk): remove support for this format. It's confusing. |
| 1241 | dateStrSlashed = dateStr.substr(0,4) + "/" + dateStr.substr(4,2) |
| 1242 | + "/" + dateStr.substr(6,2); |
| 1243 | d = Date.parse(dateStrSlashed); |
| 1244 | } else { |
| 1245 | // Any format that Date.parse will accept, e.g. "2009/07/12" or |
| 1246 | // "2009/07/12 12:34:56" |
| 1247 | d = Date.parse(dateStr); |
| 1248 | } |
| 1249 | |
| 1250 | if (!d || isNaN(d)) { |
| 1251 | self.error("Couldn't parse " + dateStr + " as a date"); |
| 1252 | } |
| 1253 | return d; |
| 1254 | }; |
| 1255 | |
| 1256 | /** |
| 1257 | * Detects the type of the str (date or numeric) and sets the various |
| 1258 | * formatting attributes in this.attrs_ based on this type. |
| 1259 | * @param {String} str An x value. |
| 1260 | * @private |
| 1261 | */ |
| 1262 | Dygraph.prototype.detectTypeFromString_ = function(str) { |
| 1263 | var isDate = false; |
| 1264 | if (str.indexOf('-') >= 0 || |
| 1265 | str.indexOf('/') >= 0 || |
| 1266 | isNaN(parseFloat(str))) { |
| 1267 | isDate = true; |
| 1268 | } else if (str.length == 8 && str > '19700101' && str < '20371231') { |
| 1269 | // TODO(danvk): remove support for this format. |
| 1270 | isDate = true; |
| 1271 | } |
| 1272 | |
| 1273 | if (isDate) { |
| 1274 | this.attrs_.xValueFormatter = Dygraph.dateString_; |
| 1275 | this.attrs_.xValueParser = Dygraph.dateParser; |
| 1276 | this.attrs_.xTicker = Dygraph.dateTicker; |
| 1277 | } else { |
| 1278 | this.attrs_.xValueFormatter = function(x) { return x; }; |
| 1279 | this.attrs_.xValueParser = function(x) { return parseFloat(x); }; |
| 1280 | this.attrs_.xTicker = Dygraph.numericTicks; |
| 1281 | } |
| 1282 | }; |
| 1283 | |
| 1284 | /** |
| 1285 | * Parses a string in a special csv format. We expect a csv file where each |
| 1286 | * line is a date point, and the first field in each line is the date string. |
| 1287 | * We also expect that all remaining fields represent series. |
| 1288 | * if the errorBars attribute is set, then interpret the fields as: |
| 1289 | * date, series1, stddev1, series2, stddev2, ... |
| 1290 | * @param {Array.<Object>} data See above. |
| 1291 | * @private |
| 1292 | * |
| 1293 | * @return Array.<Object> An array with one entry for each row. These entries |
| 1294 | * are an array of cells in that row. The first entry is the parsed x-value for |
| 1295 | * the row. The second, third, etc. are the y-values. These can take on one of |
| 1296 | * three forms, depending on the CSV and constructor parameters: |
| 1297 | * 1. numeric value |
| 1298 | * 2. [ value, stddev ] |
| 1299 | * 3. [ low value, center value, high value ] |
| 1300 | */ |
| 1301 | Dygraph.prototype.parseCSV_ = function(data) { |
| 1302 | var ret = []; |
| 1303 | var lines = data.split("\n"); |
| 1304 | var start = 0; |
| 1305 | if (this.labelsFromCSV_) { |
| 1306 | start = 1; |
| 1307 | this.attrs_.labels = lines[0].split(","); |
| 1308 | } |
| 1309 | |
| 1310 | var xParser; |
| 1311 | var defaultParserSet = false; // attempt to auto-detect x value type |
| 1312 | var expectedCols = this.attr_("labels").length; |
| 1313 | for (var i = start; i < lines.length; i++) { |
| 1314 | var line = lines[i]; |
| 1315 | if (line.length == 0) continue; // skip blank lines |
| 1316 | var inFields = line.split(','); |
| 1317 | if (inFields.length < 2) continue; |
| 1318 | |
| 1319 | var fields = []; |
| 1320 | if (!defaultParserSet) { |
| 1321 | this.detectTypeFromString_(inFields[0]); |
| 1322 | xParser = this.attr_("xValueParser"); |
| 1323 | defaultParserSet = true; |
| 1324 | } |
| 1325 | fields[0] = xParser(inFields[0], this); |
| 1326 | |
| 1327 | // If fractions are expected, parse the numbers as "A/B" |
| 1328 | if (this.fractions_) { |
| 1329 | for (var j = 1; j < inFields.length; j++) { |
| 1330 | // TODO(danvk): figure out an appropriate way to flag parse errors. |
| 1331 | var vals = inFields[j].split("/"); |
| 1332 | fields[j] = [parseFloat(vals[0]), parseFloat(vals[1])]; |
| 1333 | } |
| 1334 | } else if (this.attr_("errorBars")) { |
| 1335 | // If there are error bars, values are (value, stddev) pairs |
| 1336 | for (var j = 1; j < inFields.length; j += 2) |
| 1337 | fields[(j + 1) / 2] = [parseFloat(inFields[j]), |
| 1338 | parseFloat(inFields[j + 1])]; |
| 1339 | } else if (this.attr_("customBars")) { |
| 1340 | // Bars are a low;center;high tuple |
| 1341 | for (var j = 1; j < inFields.length; j++) { |
| 1342 | var vals = inFields[j].split(";"); |
| 1343 | fields[j] = [ parseFloat(vals[0]), |
| 1344 | parseFloat(vals[1]), |
| 1345 | parseFloat(vals[2]) ]; |
| 1346 | } |
| 1347 | } else { |
| 1348 | // Values are just numbers |
| 1349 | for (var j = 1; j < inFields.length; j++) { |
| 1350 | fields[j] = parseFloat(inFields[j]); |
| 1351 | } |
| 1352 | } |
| 1353 | ret.push(fields); |
| 1354 | |
| 1355 | if (fields.length != expectedCols) { |
| 1356 | this.error("Number of columns in line " + i + " (" + fields.length + |
| 1357 | ") does not agree with number of labels (" + expectedCols + |
| 1358 | ") " + line); |
| 1359 | } |
| 1360 | } |
| 1361 | return ret; |
| 1362 | }; |
| 1363 | |
| 1364 | /** |
| 1365 | * The user has provided their data as a pre-packaged JS array. If the x values |
| 1366 | * are numeric, this is the same as dygraphs' internal format. If the x values |
| 1367 | * are dates, we need to convert them from Date objects to ms since epoch. |
| 1368 | * @param {Array.<Object>} data |
| 1369 | * @return {Array.<Object>} data with numeric x values. |
| 1370 | */ |
| 1371 | Dygraph.prototype.parseArray_ = function(data) { |
| 1372 | // Peek at the first x value to see if it's numeric. |
| 1373 | if (data.length == 0) { |
| 1374 | this.error("Can't plot empty data set"); |
| 1375 | return null; |
| 1376 | } |
| 1377 | if (data[0].length == 0) { |
| 1378 | this.error("Data set cannot contain an empty row"); |
| 1379 | return null; |
| 1380 | } |
| 1381 | |
| 1382 | if (this.attr_("labels") == null) { |
| 1383 | this.warn("Using default labels. Set labels explicitly via 'labels' " + |
| 1384 | "in the options parameter"); |
| 1385 | this.attrs_.labels = [ "X" ]; |
| 1386 | for (var i = 1; i < data[0].length; i++) { |
| 1387 | this.attrs_.labels.push("Y" + i); |
| 1388 | } |
| 1389 | } |
| 1390 | |
| 1391 | if (MochiKit.Base.isDateLike(data[0][0])) { |
| 1392 | // Some intelligent defaults for a date x-axis. |
| 1393 | this.attrs_.xValueFormatter = Dygraph.dateString_; |
| 1394 | this.attrs_.xTicker = Dygraph.dateTicker; |
| 1395 | |
| 1396 | // Assume they're all dates. |
| 1397 | var parsedData = MochiKit.Base.clone(data); |
| 1398 | for (var i = 0; i < data.length; i++) { |
| 1399 | if (parsedData[i].length == 0) { |
| 1400 | this.error("Row " << (1 + i) << " of data is empty"); |
| 1401 | return null; |
| 1402 | } |
| 1403 | if (parsedData[i][0] == null |
| 1404 | || typeof(parsedData[i][0].getTime) != 'function') { |
| 1405 | this.error("x value in row " << (1 + i) << " is not a Date"); |
| 1406 | return null; |
| 1407 | } |
| 1408 | parsedData[i][0] = parsedData[i][0].getTime(); |
| 1409 | } |
| 1410 | return parsedData; |
| 1411 | } else { |
| 1412 | // Some intelligent defaults for a numeric x-axis. |
| 1413 | this.attrs_.xValueFormatter = function(x) { return x; }; |
| 1414 | this.attrs_.xTicker = Dygraph.numericTicks; |
| 1415 | return data; |
| 1416 | } |
| 1417 | }; |
| 1418 | |
| 1419 | /** |
| 1420 | * Parses a DataTable object from gviz. |
| 1421 | * The data is expected to have a first column that is either a date or a |
| 1422 | * number. All subsequent columns must be numbers. If there is a clear mismatch |
| 1423 | * between this.xValueParser_ and the type of the first column, it will be |
| 1424 | * fixed. Returned value is in the same format as return value of parseCSV_. |
| 1425 | * @param {Array.<Object>} data See above. |
| 1426 | * @private |
| 1427 | */ |
| 1428 | Dygraph.prototype.parseDataTable_ = function(data) { |
| 1429 | var cols = data.getNumberOfColumns(); |
| 1430 | var rows = data.getNumberOfRows(); |
| 1431 | |
| 1432 | // Read column labels |
| 1433 | var labels = []; |
| 1434 | for (var i = 0; i < cols; i++) { |
| 1435 | labels.push(data.getColumnLabel(i)); |
| 1436 | } |
| 1437 | this.attrs_.labels = labels; |
| 1438 | |
| 1439 | var indepType = data.getColumnType(0); |
| 1440 | if (indepType == 'date') { |
| 1441 | this.attrs_.xValueFormatter = Dygraph.dateString_; |
| 1442 | this.attrs_.xValueParser = Dygraph.dateParser; |
| 1443 | this.attrs_.xTicker = Dygraph.dateTicker; |
| 1444 | } else if (indepType == 'number') { |
| 1445 | this.attrs_.xValueFormatter = function(x) { return x; }; |
| 1446 | this.attrs_.xValueParser = function(x) { return parseFloat(x); }; |
| 1447 | this.attrs_.xTicker = Dygraph.numericTicks; |
| 1448 | } else { |
| 1449 | this.error("only 'date' and 'number' types are supported for column 1 " + |
| 1450 | "of DataTable input (Got '" + indepType + "')"); |
| 1451 | return null; |
| 1452 | } |
| 1453 | |
| 1454 | var ret = []; |
| 1455 | for (var i = 0; i < rows; i++) { |
| 1456 | var row = []; |
| 1457 | if (!data.getValue(i, 0)) continue; |
| 1458 | if (indepType == 'date') { |
| 1459 | row.push(data.getValue(i, 0).getTime()); |
| 1460 | } else { |
| 1461 | row.push(data.getValue(i, 0)); |
| 1462 | } |
| 1463 | for (var j = 1; j < cols; j++) { |
| 1464 | row.push(data.getValue(i, j)); |
| 1465 | } |
| 1466 | ret.push(row); |
| 1467 | } |
| 1468 | return ret; |
| 1469 | } |
| 1470 | |
| 1471 | /** |
| 1472 | * Get the CSV data. If it's in a function, call that function. If it's in a |
| 1473 | * file, do an XMLHttpRequest to get it. |
| 1474 | * @private |
| 1475 | */ |
| 1476 | Dygraph.prototype.start_ = function() { |
| 1477 | if (typeof this.file_ == 'function') { |
| 1478 | // CSV string. Pretend we got it via XHR. |
| 1479 | this.loadedEvent_(this.file_()); |
| 1480 | } else if (MochiKit.Base.isArrayLike(this.file_)) { |
| 1481 | this.rawData_ = this.parseArray_(this.file_); |
| 1482 | this.drawGraph_(this.rawData_); |
| 1483 | } else if (typeof this.file_ == 'object' && |
| 1484 | typeof this.file_.getColumnRange == 'function') { |
| 1485 | // must be a DataTable from gviz. |
| 1486 | this.rawData_ = this.parseDataTable_(this.file_); |
| 1487 | this.drawGraph_(this.rawData_); |
| 1488 | } else if (typeof this.file_ == 'string') { |
| 1489 | // Heuristic: a newline means it's CSV data. Otherwise it's an URL. |
| 1490 | if (this.file_.indexOf('\n') >= 0) { |
| 1491 | this.loadedEvent_(this.file_); |
| 1492 | } else { |
| 1493 | var req = new XMLHttpRequest(); |
| 1494 | var caller = this; |
| 1495 | req.onreadystatechange = function () { |
| 1496 | if (req.readyState == 4) { |
| 1497 | if (req.status == 200) { |
| 1498 | caller.loadedEvent_(req.responseText); |
| 1499 | } |
| 1500 | } |
| 1501 | }; |
| 1502 | |
| 1503 | req.open("GET", this.file_, true); |
| 1504 | req.send(null); |
| 1505 | } |
| 1506 | } else { |
| 1507 | this.error("Unknown data format: " + (typeof this.file_)); |
| 1508 | } |
| 1509 | }; |
| 1510 | |
| 1511 | /** |
| 1512 | * Changes various properties of the graph. These can include: |
| 1513 | * <ul> |
| 1514 | * <li>file: changes the source data for the graph</li> |
| 1515 | * <li>errorBars: changes whether the data contains stddev</li> |
| 1516 | * </ul> |
| 1517 | * @param {Object} attrs The new properties and values |
| 1518 | */ |
| 1519 | Dygraph.prototype.updateOptions = function(attrs) { |
| 1520 | // TODO(danvk): this is a mess. Rethink this function. |
| 1521 | if (attrs.rollPeriod) { |
| 1522 | this.rollPeriod_ = attrs.rollPeriod; |
| 1523 | } |
| 1524 | if (attrs.dateWindow) { |
| 1525 | this.dateWindow_ = attrs.dateWindow; |
| 1526 | } |
| 1527 | if (attrs.valueRange) { |
| 1528 | this.valueRange_ = attrs.valueRange; |
| 1529 | } |
| 1530 | MochiKit.Base.update(this.user_attrs_, attrs); |
| 1531 | |
| 1532 | this.labelsFromCSV_ = (this.attr_("labels") == null); |
| 1533 | |
| 1534 | // TODO(danvk): this doesn't match the constructor logic |
| 1535 | this.layout_.updateOptions({ 'errorBars': this.attr_("errorBars") }); |
| 1536 | if (attrs['file'] && attrs['file'] != this.file_) { |
| 1537 | this.file_ = attrs['file']; |
| 1538 | this.start_(); |
| 1539 | } else { |
| 1540 | this.drawGraph_(this.rawData_); |
| 1541 | } |
| 1542 | }; |
| 1543 | |
| 1544 | /** |
| 1545 | * Adjusts the number of days in the rolling average. Updates the graph to |
| 1546 | * reflect the new averaging period. |
| 1547 | * @param {Number} length Number of days over which to average the data. |
| 1548 | */ |
| 1549 | Dygraph.prototype.adjustRoll = function(length) { |
| 1550 | this.rollPeriod_ = length; |
| 1551 | this.drawGraph_(this.rawData_); |
| 1552 | }; |
| 1553 | |
| 1554 | |
| 1555 | /** |
| 1556 | * A wrapper around Dygraph that implements the gviz API. |
| 1557 | * @param {Object} container The DOM object the visualization should live in. |
| 1558 | */ |
| 1559 | Dygraph.GVizChart = function(container) { |
| 1560 | this.container = container; |
| 1561 | } |
| 1562 | |
| 1563 | Dygraph.GVizChart.prototype.draw = function(data, options) { |
| 1564 | this.container.innerHTML = ''; |
| 1565 | this.date_graph = new Dygraph(this.container, data, options); |
| 1566 | } |
| 1567 | |
| 1568 | // Older pages may still use this name. |
| 1569 | DateGraph = Dygraph; |