Commit | Line | Data |
---|---|---|
6a1aa64f DV |
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 | |
285a6bda DV |
6 | * string. Dygraph can handle multiple series with or without error bars. The |
7 | * date/value ranges will be automatically set. Dygraph uses the | |
6a1aa64f DV |
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"> | |
285a6bda DV |
14 | new Dygraph(document.getElementById("graphdiv"), |
15 | "datafile.csv", // CSV file with headers | |
16 | { }); // options | |
6a1aa64f DV |
17 | </script> |
18 | ||
19 | The CSV file is of the form | |
20 | ||
285a6bda | 21 | Date,SeriesA,SeriesB,SeriesC |
6a1aa64f DV |
22 | YYYYMMDD,A1,B1,C1 |
23 | YYYYMMDD,A2,B2,C2 | |
24 | ||
6a1aa64f DV |
25 | If the 'errorBars' option is set in the constructor, the input should be of |
26 | the form | |
27 | ||
285a6bda | 28 | Date,SeriesA,SeriesB,... |
6a1aa64f DV |
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 | ||
285a6bda | 34 | Date,SeriesA,SeriesB,... |
6a1aa64f DV |
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 | ||
285a6bda | 40 | For further documentation and examples, see http://www.danvk.org/dygraphs |
6a1aa64f DV |
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,... | |
6a1aa64f DV |
50 | * @param {Object} attrs Various other attributes, e.g. errorBars determines |
51 | * whether the input data contains error ranges. | |
52 | */ | |
285a6bda DV |
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 | } | |
6a1aa64f DV |
65 | }; |
66 | ||
285a6bda DV |
67 | Dygraph.NAME = "Dygraph"; |
68 | Dygraph.VERSION = "1.2"; | |
69 | Dygraph.__repr__ = function() { | |
6a1aa64f DV |
70 | return "[" + this.NAME + " " + this.VERSION + "]"; |
71 | }; | |
285a6bda | 72 | Dygraph.toString = function() { |
6a1aa64f DV |
73 | return this.__repr__(); |
74 | }; | |
75 | ||
76 | // Various default values | |
285a6bda DV |
77 | Dygraph.DEFAULT_ROLL_PERIOD = 1; |
78 | Dygraph.DEFAULT_WIDTH = 480; | |
79 | Dygraph.DEFAULT_HEIGHT = 320; | |
80 | Dygraph.AXIS_LINE_WIDTH = 0.3; | |
6a1aa64f | 81 | |
8e4a6af3 | 82 | // Default attribute values. |
285a6bda | 83 | Dygraph.DEFAULT_ATTRS = { |
a9fc39ab | 84 | highlightCircleSize: 3, |
8e4a6af3 | 85 | pixelsPerXLabel: 60, |
c6336f04 | 86 | pixelsPerYLabel: 30, |
285a6bda | 87 | |
8e4a6af3 DV |
88 | labelsDivWidth: 250, |
89 | labelsDivStyles: { | |
90 | // TODO(danvk): move defaults from createStatusMessage_ here. | |
285a6bda DV |
91 | }, |
92 | labelsSeparateLines: false, | |
93 | labelsKMB: false, | |
94 | ||
95 | strokeWidth: 1.0, | |
8e4a6af3 DV |
96 | |
97 | // TODO(danvk): default padding | |
285a6bda DV |
98 | |
99 | showRoller: false, | |
100 | xValueFormatter: Dygraph.dateString_, | |
101 | xValueParser: Dygraph.dateParser, | |
102 | xTicker: Dygraph.dateTicker, | |
103 | ||
104 | sigma: 2.0, | |
105 | errorBars: false, | |
106 | fractions: false, | |
107 | wilsonInterval: true, // only relevant if fractions is true | |
108 | customBars: false | |
109 | }; | |
110 | ||
111 | // Various logging levels. | |
112 | Dygraph.DEBUG = 1; | |
113 | Dygraph.INFO = 2; | |
114 | Dygraph.WARNING = 3; | |
115 | Dygraph.ERROR = 3; | |
116 | ||
117 | Dygraph.prototype.__old_init__ = function(div, file, labels, attrs) { | |
118 | // Labels is no longer a constructor parameter, since it's typically set | |
119 | // directly from the data source. It also conains a name for the x-axis, | |
120 | // which the previous constructor form did not. | |
121 | if (labels != null) { | |
122 | var new_labels = ["Date"]; | |
123 | for (var i = 0; i < labels.length; i++) new_labels.push(labels[i]); | |
124 | MochiKit.Base.update(attrs, { 'labels': new_labels }); | |
125 | } | |
126 | this.__init__(div, file, attrs); | |
8e4a6af3 DV |
127 | }; |
128 | ||
6a1aa64f | 129 | /** |
285a6bda | 130 | * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit |
6a1aa64f DV |
131 | * and interaction <canvas> inside of it. See the constructor for details |
132 | * on the parameters. | |
133 | * @param {String | Function} file Source data | |
134 | * @param {Array.<String>} labels Names of the data series | |
135 | * @param {Object} attrs Miscellaneous other options | |
136 | * @private | |
137 | */ | |
285a6bda DV |
138 | Dygraph.prototype.__init__ = function(div, file, attrs) { |
139 | // Support two-argument constructor | |
140 | if (attrs == null) { attrs = {}; } | |
141 | ||
6a1aa64f | 142 | // Copy the important bits into the object |
32988383 | 143 | // TODO(danvk): most of these should just stay in the attrs_ dictionary. |
6a1aa64f | 144 | this.maindiv_ = div; |
6a1aa64f | 145 | this.file_ = file; |
285a6bda | 146 | this.rollPeriod_ = attrs.rollPeriod || Dygraph.DEFAULT_ROLL_PERIOD; |
6a1aa64f | 147 | this.previousVerticalX_ = -1; |
6a1aa64f | 148 | this.fractions_ = attrs.fractions || false; |
6a1aa64f DV |
149 | this.dateWindow_ = attrs.dateWindow || null; |
150 | this.valueRange_ = attrs.valueRange || null; | |
6a1aa64f DV |
151 | this.wilsonInterval_ = attrs.wilsonInterval || true; |
152 | this.customBars_ = attrs.customBars || false; | |
8e4a6af3 | 153 | |
285a6bda DV |
154 | // If the div isn't already sized then give it a default size. |
155 | if (div.style.width == '') { | |
156 | div.style.width = Dygraph.DEFAULT_WIDTH + "px"; | |
157 | } | |
158 | if (div.style.height == '') { | |
159 | div.style.height = Dygraph.DEFAULT_HEIGHT + "px"; | |
32988383 | 160 | } |
285a6bda DV |
161 | this.width_ = parseInt(div.style.width, 10); |
162 | this.height_ = parseInt(div.style.height, 10); | |
32988383 | 163 | |
285a6bda DV |
164 | // Dygraphs has many options, some of which interact with one another. |
165 | // To keep track of everything, we maintain two sets of options: | |
166 | // | |
167 | // this.user_attrs_ only options explicitly set by the user. | |
168 | // this.attrs_ defaults, options derived from user_attrs_, data. | |
169 | // | |
170 | // Options are then accessed this.attr_('attr'), which first looks at | |
171 | // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent | |
172 | // defaults without overriding behavior that the user specifically asks for. | |
173 | this.user_attrs_ = {}; | |
174 | MochiKit.Base.update(this.user_attrs_, attrs); | |
6a1aa64f | 175 | |
285a6bda DV |
176 | this.attrs_ = {}; |
177 | MochiKit.Base.update(this.attrs_, Dygraph.DEFAULT_ATTRS); | |
6a1aa64f | 178 | |
285a6bda DV |
179 | // Make a note of whether labels will be pulled from the CSV file. |
180 | this.labelsFromCSV_ = (this.attr_("labels") == null); | |
6a1aa64f DV |
181 | |
182 | // Create the containing DIV and other interactive elements | |
183 | this.createInterface_(); | |
184 | ||
185 | // Create the PlotKit grapher | |
285a6bda DV |
186 | // TODO(danvk): why does the Layout need its own set of options? |
187 | this.layoutOptions_ = { 'errorBars': (this.attr_("errorBars") || | |
188 | this.customBars_), | |
6a1aa64f | 189 | 'xOriginIsZero': false }; |
285a6bda DV |
190 | MochiKit.Base.update(this.layoutOptions_, this.attrs_); |
191 | MochiKit.Base.update(this.layoutOptions_, this.user_attrs_); | |
6a1aa64f | 192 | |
285a6bda | 193 | this.layout_ = new DygraphLayout(this.layoutOptions_); |
6a1aa64f | 194 | |
285a6bda | 195 | // TODO(danvk): why does the Renderer need its own set of options? |
6a1aa64f DV |
196 | this.renderOptions_ = { colorScheme: this.colors_, |
197 | strokeColor: null, | |
285a6bda | 198 | strokeWidth: this.attr_("strokeWidth"), |
6a1aa64f | 199 | axisLabelFontSize: 14, |
285a6bda DV |
200 | axisLineWidth: Dygraph.AXIS_LINE_WIDTH }; |
201 | MochiKit.Base.update(this.renderOptions_, this.attrs_); | |
202 | MochiKit.Base.update(this.renderOptions_, this.user_attrs_); | |
203 | this.plotter_ = new DygraphCanvasRenderer(this.hidden_, this.layout_, | |
204 | this.renderOptions_); | |
6a1aa64f DV |
205 | |
206 | this.createStatusMessage_(); | |
207 | this.createRollInterface_(); | |
208 | this.createDragInterface_(); | |
209 | ||
738fc797 DV |
210 | // connect(window, 'onload', this, function(e) { this.start_(); }); |
211 | this.start_(); | |
6a1aa64f DV |
212 | }; |
213 | ||
285a6bda DV |
214 | Dygraph.prototype.attr_ = function(name) { |
215 | if (typeof(this.user_attrs_[name]) != 'undefined') { | |
216 | return this.user_attrs_[name]; | |
217 | } else if (typeof(this.attrs_[name]) != 'undefined') { | |
218 | return this.attrs_[name]; | |
219 | } else { | |
220 | return null; | |
221 | } | |
222 | }; | |
223 | ||
224 | // TODO(danvk): any way I can get the line numbers to be this.warn call? | |
225 | Dygraph.prototype.log = function(severity, message) { | |
226 | if (typeof(console) != 'undefined') { | |
227 | switch (severity) { | |
228 | case Dygraph.DEBUG: | |
229 | console.debug('dygraphs: ' + message); | |
230 | break; | |
231 | case Dygraph.INFO: | |
232 | console.info('dygraphs: ' + message); | |
233 | break; | |
234 | case Dygraph.WARNING: | |
235 | console.warn('dygraphs: ' + message); | |
236 | break; | |
237 | case Dygraph.ERROR: | |
238 | console.error('dygraphs: ' + message); | |
239 | break; | |
240 | } | |
241 | } | |
242 | } | |
243 | Dygraph.prototype.info = function(message) { | |
244 | this.log(Dygraph.INFO, message); | |
245 | } | |
246 | Dygraph.prototype.warn = function(message) { | |
247 | this.log(Dygraph.WARNING, message); | |
248 | } | |
249 | Dygraph.prototype.error = function(message) { | |
250 | this.log(Dygraph.ERROR, message); | |
251 | } | |
252 | ||
6a1aa64f DV |
253 | /** |
254 | * Returns the current rolling period, as set by the user or an option. | |
255 | * @return {Number} The number of days in the rolling window | |
256 | */ | |
285a6bda | 257 | Dygraph.prototype.rollPeriod = function() { |
6a1aa64f DV |
258 | return this.rollPeriod_; |
259 | } | |
260 | ||
261 | /** | |
285a6bda | 262 | * Generates interface elements for the Dygraph: a containing div, a div to |
6a1aa64f DV |
263 | * display the current point, and a textbox to adjust the rolling average |
264 | * period. | |
265 | * @private | |
266 | */ | |
285a6bda | 267 | Dygraph.prototype.createInterface_ = function() { |
6a1aa64f DV |
268 | // Create the all-enclosing graph div |
269 | var enclosing = this.maindiv_; | |
270 | ||
271 | this.graphDiv = MochiKit.DOM.DIV( { style: { 'width': this.width_ + "px", | |
272 | 'height': this.height_ + "px" | |
273 | }}); | |
274 | appendChildNodes(enclosing, this.graphDiv); | |
275 | ||
276 | // Create the canvas to store | |
277 | var canvas = MochiKit.DOM.CANVAS; | |
278 | this.canvas_ = canvas( { style: { 'position': 'absolute' }, | |
279 | width: this.width_, | |
280 | height: this.height_}); | |
281 | appendChildNodes(this.graphDiv, this.canvas_); | |
282 | ||
283 | this.hidden_ = this.createPlotKitCanvas_(this.canvas_); | |
284 | connect(this.hidden_, 'onmousemove', this, function(e) { this.mouseMove_(e) }); | |
285 | connect(this.hidden_, 'onmouseout', this, function(e) { this.mouseOut_(e) }); | |
286 | } | |
287 | ||
288 | /** | |
289 | * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on | |
285a6bda DV |
290 | * this particular canvas. All Dygraph work is done on this.canvas_. |
291 | * @param {Object} canvas The Dygraph canvas to over which to overlay the plot | |
6a1aa64f DV |
292 | * @return {Object} The newly-created canvas |
293 | * @private | |
294 | */ | |
285a6bda | 295 | Dygraph.prototype.createPlotKitCanvas_ = function(canvas) { |
6a1aa64f DV |
296 | var h = document.createElement("canvas"); |
297 | h.style.position = "absolute"; | |
298 | h.style.top = canvas.style.top; | |
299 | h.style.left = canvas.style.left; | |
300 | h.width = this.width_; | |
301 | h.height = this.height_; | |
302 | MochiKit.DOM.appendChildNodes(this.graphDiv, h); | |
303 | return h; | |
304 | }; | |
305 | ||
306 | /** | |
307 | * Generate a set of distinct colors for the data series. This is done with a | |
308 | * color wheel. Saturation/Value are customizable, and the hue is | |
309 | * equally-spaced around the color wheel. If a custom set of colors is | |
310 | * specified, that is used instead. | |
6a1aa64f DV |
311 | * @private |
312 | */ | |
285a6bda DV |
313 | Dygraph.prototype.setColors_ = function() { |
314 | // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do | |
315 | // away with this.renderOptions_. | |
316 | var num = this.attr_("labels").length - 1; | |
6a1aa64f | 317 | this.colors_ = []; |
285a6bda DV |
318 | var colors = this.attr_('colors'); |
319 | if (!colors) { | |
320 | var sat = this.attr_('colorSaturation') || 1.0; | |
321 | var val = this.attr_('colorValue') || 0.5; | |
6a1aa64f DV |
322 | for (var i = 1; i <= num; i++) { |
323 | var hue = (1.0*i/(1+num)); | |
324 | this.colors_.push( MochiKit.Color.Color.fromHSV(hue, sat, val) ); | |
325 | } | |
326 | } else { | |
327 | for (var i = 0; i < num; i++) { | |
285a6bda | 328 | var colorStr = colors[i % colors.length]; |
6a1aa64f DV |
329 | this.colors_.push( MochiKit.Color.Color.fromString(colorStr) ); |
330 | } | |
331 | } | |
285a6bda DV |
332 | |
333 | // TODO(danvk): update this w/r/t/ the new options system. | |
334 | this.renderOptions_.colorScheme = this.colors_; | |
335 | MochiKit.Base.update(this.plotter_.options, this.renderOptions_); | |
336 | MochiKit.Base.update(this.layoutOptions_, this.user_attrs_); | |
337 | MochiKit.Base.update(this.layoutOptions_, this.attrs_); | |
6a1aa64f DV |
338 | } |
339 | ||
340 | /** | |
341 | * Create the div that contains information on the selected point(s) | |
342 | * This goes in the top right of the canvas, unless an external div has already | |
343 | * been specified. | |
344 | * @private | |
345 | */ | |
285a6bda DV |
346 | Dygraph.prototype.createStatusMessage_ = function(){ |
347 | if (!this.attr_("labelsDiv")) { | |
348 | var divWidth = this.attr_('labelsDivWidth'); | |
6a1aa64f DV |
349 | var messagestyle = { "style": { |
350 | "position": "absolute", | |
351 | "fontSize": "14px", | |
352 | "zIndex": 10, | |
353 | "width": divWidth + "px", | |
354 | "top": "0px", | |
355 | "left": this.width_ - divWidth + "px", | |
356 | "background": "white", | |
357 | "textAlign": "left", | |
358 | "overflow": "hidden"}}; | |
285a6bda DV |
359 | MochiKit.Base.update(messagestyle["style"], this.attr_('labelsDivStyles')); |
360 | var div = MochiKit.DOM.DIV(messagestyle); | |
361 | MochiKit.DOM.appendChildNodes(this.graphDiv, div); | |
362 | this.attrs_.labelsDiv = div; | |
6a1aa64f DV |
363 | } |
364 | }; | |
365 | ||
366 | /** | |
367 | * Create the text box to adjust the averaging period | |
368 | * @return {Object} The newly-created text box | |
369 | * @private | |
370 | */ | |
285a6bda | 371 | Dygraph.prototype.createRollInterface_ = function() { |
6a1aa64f | 372 | var padding = this.plotter_.options.padding; |
285a6bda | 373 | var display = this.attr_('showRoller') ? "block" : "none"; |
6a1aa64f DV |
374 | var textAttr = { "type": "text", |
375 | "size": "2", | |
376 | "value": this.rollPeriod_, | |
377 | "style": { "position": "absolute", | |
378 | "zIndex": 10, | |
379 | "top": (this.height_ - 25 - padding.bottom) + "px", | |
738fc797 DV |
380 | "left": (padding.left+1) + "px", |
381 | "display": display } | |
6a1aa64f DV |
382 | }; |
383 | var roller = MochiKit.DOM.INPUT(textAttr); | |
384 | var pa = this.graphDiv; | |
385 | MochiKit.DOM.appendChildNodes(pa, roller); | |
386 | connect(roller, 'onchange', this, | |
387 | function() { this.adjustRoll(roller.value); }); | |
388 | return roller; | |
389 | } | |
390 | ||
391 | /** | |
392 | * Set up all the mouse handlers needed to capture dragging behavior for zoom | |
393 | * events. Uses MochiKit.Signal to attach all the event handlers. | |
394 | * @private | |
395 | */ | |
285a6bda | 396 | Dygraph.prototype.createDragInterface_ = function() { |
6a1aa64f DV |
397 | var self = this; |
398 | ||
399 | // Tracks whether the mouse is down right now | |
400 | var mouseDown = false; | |
401 | var dragStartX = null; | |
402 | var dragStartY = null; | |
403 | var dragEndX = null; | |
404 | var dragEndY = null; | |
405 | var prevEndX = null; | |
406 | ||
407 | // Utility function to convert page-wide coordinates to canvas coords | |
67e650dc DV |
408 | var px = 0; |
409 | var py = 0; | |
6a1aa64f DV |
410 | var getX = function(e) { return e.mouse().page.x - px }; |
411 | var getY = function(e) { return e.mouse().page.y - py }; | |
412 | ||
413 | // Draw zoom rectangles when the mouse is down and the user moves around | |
414 | connect(this.hidden_, 'onmousemove', function(event) { | |
415 | if (mouseDown) { | |
416 | dragEndX = getX(event); | |
417 | dragEndY = getY(event); | |
418 | ||
419 | self.drawZoomRect_(dragStartX, dragEndX, prevEndX); | |
420 | prevEndX = dragEndX; | |
421 | } | |
422 | }); | |
423 | ||
424 | // Track the beginning of drag events | |
425 | connect(this.hidden_, 'onmousedown', function(event) { | |
426 | mouseDown = true; | |
67e650dc DV |
427 | px = PlotKit.Base.findPosX(self.canvas_); |
428 | py = PlotKit.Base.findPosY(self.canvas_); | |
6a1aa64f DV |
429 | dragStartX = getX(event); |
430 | dragStartY = getY(event); | |
431 | }); | |
432 | ||
433 | // If the user releases the mouse button during a drag, but not over the | |
434 | // canvas, then it doesn't count as a zooming action. | |
435 | connect(document, 'onmouseup', this, function(event) { | |
436 | if (mouseDown) { | |
437 | mouseDown = false; | |
438 | dragStartX = null; | |
439 | dragStartY = null; | |
440 | } | |
441 | }); | |
442 | ||
443 | // Temporarily cancel the dragging event when the mouse leaves the graph | |
444 | connect(this.hidden_, 'onmouseout', this, function(event) { | |
445 | if (mouseDown) { | |
446 | dragEndX = null; | |
447 | dragEndY = null; | |
448 | } | |
449 | }); | |
450 | ||
451 | // If the mouse is released on the canvas during a drag event, then it's a | |
452 | // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels) | |
453 | connect(this.hidden_, 'onmouseup', this, function(event) { | |
454 | if (mouseDown) { | |
455 | mouseDown = false; | |
456 | dragEndX = getX(event); | |
457 | dragEndY = getY(event); | |
458 | var regionWidth = Math.abs(dragEndX - dragStartX); | |
459 | var regionHeight = Math.abs(dragEndY - dragStartY); | |
460 | ||
461 | if (regionWidth < 2 && regionHeight < 2 && | |
285a6bda | 462 | self.attr_('clickCallback') != null && |
6a1aa64f | 463 | self.lastx_ != undefined) { |
285a6bda DV |
464 | // TODO(danvk): pass along more info about the point. |
465 | self.attr_('clickCallback')(event, new Date(self.lastx_)); | |
6a1aa64f DV |
466 | } |
467 | ||
468 | if (regionWidth >= 10) { | |
469 | self.doZoom_(Math.min(dragStartX, dragEndX), | |
470 | Math.max(dragStartX, dragEndX)); | |
471 | } else { | |
472 | self.canvas_.getContext("2d").clearRect(0, 0, | |
473 | self.canvas_.width, | |
474 | self.canvas_.height); | |
475 | } | |
476 | ||
477 | dragStartX = null; | |
478 | dragStartY = null; | |
479 | } | |
480 | }); | |
481 | ||
482 | // Double-clicking zooms back out | |
483 | connect(this.hidden_, 'ondblclick', this, function(event) { | |
484 | self.dateWindow_ = null; | |
485 | self.drawGraph_(self.rawData_); | |
486 | var minDate = self.rawData_[0][0]; | |
487 | var maxDate = self.rawData_[self.rawData_.length - 1][0]; | |
285a6bda DV |
488 | if (self.attr_("zoomCallback")) { |
489 | self.attr_("zoomCallback")(minDate, maxDate); | |
67e650dc | 490 | } |
6a1aa64f DV |
491 | }); |
492 | }; | |
493 | ||
494 | /** | |
495 | * Draw a gray zoom rectangle over the desired area of the canvas. Also clears | |
496 | * up any previous zoom rectangles that were drawn. This could be optimized to | |
497 | * avoid extra redrawing, but it's tricky to avoid interactions with the status | |
498 | * dots. | |
499 | * @param {Number} startX The X position where the drag started, in canvas | |
500 | * coordinates. | |
501 | * @param {Number} endX The current X position of the drag, in canvas coords. | |
502 | * @param {Number} prevEndX The value of endX on the previous call to this | |
503 | * function. Used to avoid excess redrawing | |
504 | * @private | |
505 | */ | |
285a6bda | 506 | Dygraph.prototype.drawZoomRect_ = function(startX, endX, prevEndX) { |
6a1aa64f DV |
507 | var ctx = this.canvas_.getContext("2d"); |
508 | ||
509 | // Clean up from the previous rect if necessary | |
510 | if (prevEndX) { | |
511 | ctx.clearRect(Math.min(startX, prevEndX), 0, | |
512 | Math.abs(startX - prevEndX), this.height_); | |
513 | } | |
514 | ||
515 | // Draw a light-grey rectangle to show the new viewing area | |
516 | if (endX && startX) { | |
517 | ctx.fillStyle = "rgba(128,128,128,0.33)"; | |
518 | ctx.fillRect(Math.min(startX, endX), 0, | |
519 | Math.abs(endX - startX), this.height_); | |
520 | } | |
521 | }; | |
522 | ||
523 | /** | |
524 | * Zoom to something containing [lowX, highX]. These are pixel coordinates | |
525 | * in the canvas. The exact zoom window may be slightly larger if there are no | |
526 | * data points near lowX or highX. This function redraws the graph. | |
527 | * @param {Number} lowX The leftmost pixel value that should be visible. | |
528 | * @param {Number} highX The rightmost pixel value that should be visible. | |
529 | * @private | |
530 | */ | |
285a6bda | 531 | Dygraph.prototype.doZoom_ = function(lowX, highX) { |
6a1aa64f DV |
532 | // Find the earliest and latest dates contained in this canvasx range. |
533 | var points = this.layout_.points; | |
534 | var minDate = null; | |
535 | var maxDate = null; | |
536 | // Find the nearest [minDate, maxDate] that contains [lowX, highX] | |
537 | for (var i = 0; i < points.length; i++) { | |
538 | var cx = points[i].canvasx; | |
539 | var x = points[i].xval; | |
540 | if (cx < lowX && (minDate == null || x > minDate)) minDate = x; | |
541 | if (cx > highX && (maxDate == null || x < maxDate)) maxDate = x; | |
542 | } | |
543 | // Use the extremes if either is missing | |
544 | if (minDate == null) minDate = points[0].xval; | |
545 | if (maxDate == null) maxDate = points[points.length-1].xval; | |
546 | ||
547 | this.dateWindow_ = [minDate, maxDate]; | |
548 | this.drawGraph_(this.rawData_); | |
285a6bda DV |
549 | if (this.attr_("zoomCallback")) { |
550 | this.attr_("zoomCallback")(minDate, maxDate); | |
67e650dc | 551 | } |
6a1aa64f DV |
552 | }; |
553 | ||
554 | /** | |
555 | * When the mouse moves in the canvas, display information about a nearby data | |
556 | * point and draw dots over those points in the data series. This function | |
557 | * takes care of cleanup of previously-drawn dots. | |
558 | * @param {Object} event The mousemove event from the browser. | |
559 | * @private | |
560 | */ | |
285a6bda | 561 | Dygraph.prototype.mouseMove_ = function(event) { |
6a1aa64f DV |
562 | var canvasx = event.mouse().page.x - PlotKit.Base.findPosX(this.hidden_); |
563 | var points = this.layout_.points; | |
564 | ||
565 | var lastx = -1; | |
566 | var lasty = -1; | |
567 | ||
568 | // Loop through all the points and find the date nearest to our current | |
569 | // location. | |
570 | var minDist = 1e+100; | |
571 | var idx = -1; | |
572 | for (var i = 0; i < points.length; i++) { | |
573 | var dist = Math.abs(points[i].canvasx - canvasx); | |
574 | if (dist > minDist) break; | |
575 | minDist = dist; | |
576 | idx = i; | |
577 | } | |
578 | if (idx >= 0) lastx = points[idx].xval; | |
579 | // Check that you can really highlight the last day's data | |
580 | if (canvasx > points[points.length-1].canvasx) | |
581 | lastx = points[points.length-1].xval; | |
582 | ||
583 | // Extract the points we've selected | |
584 | var selPoints = []; | |
585 | for (var i = 0; i < points.length; i++) { | |
586 | if (points[i].xval == lastx) { | |
587 | selPoints.push(points[i]); | |
588 | } | |
589 | } | |
590 | ||
591 | // Clear the previously drawn vertical, if there is one | |
285a6bda | 592 | var circleSize = this.attr_('highlightCircleSize'); |
6a1aa64f DV |
593 | var ctx = this.canvas_.getContext("2d"); |
594 | if (this.previousVerticalX_ >= 0) { | |
595 | var px = this.previousVerticalX_; | |
596 | ctx.clearRect(px - circleSize - 1, 0, 2 * circleSize + 2, this.height_); | |
597 | } | |
598 | ||
599 | if (selPoints.length > 0) { | |
600 | var canvasx = selPoints[0].canvasx; | |
601 | ||
602 | // Set the status message to indicate the selected point(s) | |
285a6bda | 603 | var replace = this.attr_('xValueFormatter')(lastx, this) + ":"; |
6a1aa64f DV |
604 | var clen = this.colors_.length; |
605 | for (var i = 0; i < selPoints.length; i++) { | |
285a6bda | 606 | if (this.attr_("labelsSeparateLines")) { |
6a1aa64f DV |
607 | replace += "<br/>"; |
608 | } | |
609 | var point = selPoints[i]; | |
610 | replace += " <b><font color='" + this.colors_[i%clen].toHexString() + "'>" | |
611 | + point.name + "</font></b>:" | |
612 | + this.round_(point.yval, 2); | |
613 | } | |
285a6bda | 614 | this.attr_("labelsDiv").innerHTML = replace; |
6a1aa64f DV |
615 | |
616 | // Save last x position for callbacks. | |
617 | this.lastx_ = lastx; | |
618 | ||
619 | // Draw colored circles over the center of each selected point | |
620 | ctx.save() | |
621 | for (var i = 0; i < selPoints.length; i++) { | |
622 | ctx.beginPath(); | |
623 | ctx.fillStyle = this.colors_[i%clen].toRGBString(); | |
624 | ctx.arc(canvasx, selPoints[i%clen].canvasy, circleSize, 0, 360, false); | |
625 | ctx.fill(); | |
626 | } | |
627 | ctx.restore(); | |
628 | ||
629 | this.previousVerticalX_ = canvasx; | |
630 | } | |
631 | }; | |
632 | ||
633 | /** | |
634 | * The mouse has left the canvas. Clear out whatever artifacts remain | |
635 | * @param {Object} event the mouseout event from the browser. | |
636 | * @private | |
637 | */ | |
285a6bda | 638 | Dygraph.prototype.mouseOut_ = function(event) { |
6a1aa64f DV |
639 | // Get rid of the overlay data |
640 | var ctx = this.canvas_.getContext("2d"); | |
641 | ctx.clearRect(0, 0, this.width_, this.height_); | |
285a6bda | 642 | this.attr_("labelsDiv").innerHTML = ""; |
6a1aa64f DV |
643 | }; |
644 | ||
285a6bda | 645 | Dygraph.zeropad = function(x) { |
32988383 DV |
646 | if (x < 10) return "0" + x; else return "" + x; |
647 | } | |
648 | ||
6a1aa64f | 649 | /** |
6b8e33dd DV |
650 | * Return a string version of the hours, minutes and seconds portion of a date. |
651 | * @param {Number} date The JavaScript date (ms since epoch) | |
652 | * @return {String} A time of the form "HH:MM:SS" | |
653 | * @private | |
654 | */ | |
285a6bda DV |
655 | Dygraph.prototype.hmsString_ = function(date) { |
656 | var zeropad = Dygraph.zeropad; | |
6b8e33dd DV |
657 | var d = new Date(date); |
658 | if (d.getSeconds()) { | |
659 | return zeropad(d.getHours()) + ":" + | |
660 | zeropad(d.getMinutes()) + ":" + | |
661 | zeropad(d.getSeconds()); | |
662 | } else if (d.getMinutes()) { | |
663 | return zeropad(d.getHours()) + ":" + zeropad(d.getMinutes()); | |
664 | } else { | |
665 | return zeropad(d.getHours()); | |
666 | } | |
667 | } | |
668 | ||
669 | /** | |
6a1aa64f DV |
670 | * Convert a JS date (millis since epoch) to YYYY/MM/DD |
671 | * @param {Number} date The JavaScript date (ms since epoch) | |
672 | * @return {String} A date of the form "YYYY/MM/DD" | |
673 | * @private | |
285a6bda | 674 | * TODO(danvk): why is this part of the prototype? |
6a1aa64f | 675 | */ |
285a6bda DV |
676 | Dygraph.dateString_ = function(date, self) { |
677 | var zeropad = Dygraph.zeropad; | |
6a1aa64f DV |
678 | var d = new Date(date); |
679 | ||
680 | // Get the year: | |
681 | var year = "" + d.getFullYear(); | |
682 | // Get a 0 padded month string | |
6b8e33dd | 683 | var month = zeropad(d.getMonth() + 1); //months are 0-offset, sigh |
6a1aa64f | 684 | // Get a 0 padded day string |
6b8e33dd | 685 | var day = zeropad(d.getDate()); |
6a1aa64f | 686 | |
6b8e33dd DV |
687 | var ret = ""; |
688 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); | |
285a6bda | 689 | if (frac) ret = " " + self.hmsString_(date); |
6b8e33dd DV |
690 | |
691 | return year + "/" + month + "/" + day + ret; | |
6a1aa64f DV |
692 | }; |
693 | ||
694 | /** | |
695 | * Round a number to the specified number of digits past the decimal point. | |
696 | * @param {Number} num The number to round | |
697 | * @param {Number} places The number of decimals to which to round | |
698 | * @return {Number} The rounded number | |
699 | * @private | |
700 | */ | |
285a6bda | 701 | Dygraph.prototype.round_ = function(num, places) { |
6a1aa64f DV |
702 | var shift = Math.pow(10, places); |
703 | return Math.round(num * shift)/shift; | |
704 | }; | |
705 | ||
706 | /** | |
707 | * Fires when there's data available to be graphed. | |
708 | * @param {String} data Raw CSV data to be plotted | |
709 | * @private | |
710 | */ | |
285a6bda | 711 | Dygraph.prototype.loadedEvent_ = function(data) { |
6a1aa64f DV |
712 | this.rawData_ = this.parseCSV_(data); |
713 | this.drawGraph_(this.rawData_); | |
714 | }; | |
715 | ||
285a6bda | 716 | Dygraph.prototype.months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", |
6a1aa64f | 717 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; |
285a6bda | 718 | Dygraph.prototype.quarters = ["Jan", "Apr", "Jul", "Oct"]; |
6a1aa64f DV |
719 | |
720 | /** | |
721 | * Add ticks on the x-axis representing years, months, quarters, weeks, or days | |
722 | * @private | |
723 | */ | |
285a6bda | 724 | Dygraph.prototype.addXTicks_ = function() { |
6a1aa64f DV |
725 | // Determine the correct ticks scale on the x-axis: quarterly, monthly, ... |
726 | var startDate, endDate; | |
727 | if (this.dateWindow_) { | |
728 | startDate = this.dateWindow_[0]; | |
729 | endDate = this.dateWindow_[1]; | |
730 | } else { | |
731 | startDate = this.rawData_[0][0]; | |
732 | endDate = this.rawData_[this.rawData_.length - 1][0]; | |
733 | } | |
734 | ||
285a6bda | 735 | var xTicks = this.attr_('xTicker')(startDate, endDate, this); |
6a1aa64f | 736 | this.layout_.updateOptions({xTicks: xTicks}); |
32988383 DV |
737 | }; |
738 | ||
739 | // Time granularity enumeration | |
285a6bda DV |
740 | Dygraph.SECONDLY = 0; |
741 | Dygraph.TEN_SECONDLY = 1; | |
742 | Dygraph.THIRTY_SECONDLY = 2; | |
743 | Dygraph.MINUTELY = 3; | |
744 | Dygraph.TEN_MINUTELY = 4; | |
745 | Dygraph.THIRTY_MINUTELY = 5; | |
746 | Dygraph.HOURLY = 6; | |
747 | Dygraph.SIX_HOURLY = 7; | |
748 | Dygraph.DAILY = 8; | |
749 | Dygraph.WEEKLY = 9; | |
750 | Dygraph.MONTHLY = 10; | |
751 | Dygraph.QUARTERLY = 11; | |
752 | Dygraph.BIANNUAL = 12; | |
753 | Dygraph.ANNUAL = 13; | |
754 | Dygraph.DECADAL = 14; | |
755 | Dygraph.NUM_GRANULARITIES = 15; | |
756 | ||
757 | Dygraph.SHORT_SPACINGS = []; | |
758 | Dygraph.SHORT_SPACINGS[Dygraph.SECONDLY] = 1000 * 1; | |
759 | Dygraph.SHORT_SPACINGS[Dygraph.TEN_SECONDLY] = 1000 * 10; | |
760 | Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_SECONDLY] = 1000 * 30; | |
761 | Dygraph.SHORT_SPACINGS[Dygraph.MINUTELY] = 1000 * 60; | |
762 | Dygraph.SHORT_SPACINGS[Dygraph.TEN_MINUTELY] = 1000 * 60 * 10; | |
763 | Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_MINUTELY] = 1000 * 60 * 30; | |
764 | Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600; | |
765 | Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600 * 6; | |
766 | Dygraph.SHORT_SPACINGS[Dygraph.DAILY] = 1000 * 86400; | |
767 | Dygraph.SHORT_SPACINGS[Dygraph.WEEKLY] = 1000 * 604800; | |
32988383 DV |
768 | |
769 | // NumXTicks() | |
770 | // | |
771 | // If we used this time granularity, how many ticks would there be? | |
772 | // This is only an approximation, but it's generally good enough. | |
773 | // | |
285a6bda DV |
774 | Dygraph.prototype.NumXTicks = function(start_time, end_time, granularity) { |
775 | if (granularity < Dygraph.MONTHLY) { | |
32988383 | 776 | // Generate one tick mark for every fixed interval of time. |
285a6bda | 777 | var spacing = Dygraph.SHORT_SPACINGS[granularity]; |
32988383 DV |
778 | return Math.floor(0.5 + 1.0 * (end_time - start_time) / spacing); |
779 | } else { | |
780 | var year_mod = 1; // e.g. to only print one point every 10 years. | |
781 | var num_months = 12; | |
285a6bda DV |
782 | if (granularity == Dygraph.QUARTERLY) num_months = 3; |
783 | if (granularity == Dygraph.BIANNUAL) num_months = 2; | |
784 | if (granularity == Dygraph.ANNUAL) num_months = 1; | |
785 | if (granularity == Dygraph.DECADAL) { num_months = 1; year_mod = 10; } | |
32988383 DV |
786 | |
787 | var msInYear = 365.2524 * 24 * 3600 * 1000; | |
788 | var num_years = 1.0 * (end_time - start_time) / msInYear; | |
789 | return Math.floor(0.5 + 1.0 * num_years * num_months / year_mod); | |
790 | } | |
791 | }; | |
792 | ||
793 | // GetXAxis() | |
794 | // | |
795 | // Construct an x-axis of nicely-formatted times on meaningful boundaries | |
796 | // (e.g. 'Jan 09' rather than 'Jan 22, 2009'). | |
797 | // | |
798 | // Returns an array containing {v: millis, label: label} dictionaries. | |
799 | // | |
285a6bda | 800 | Dygraph.prototype.GetXAxis = function(start_time, end_time, granularity) { |
32988383 | 801 | var ticks = []; |
285a6bda | 802 | if (granularity < Dygraph.MONTHLY) { |
32988383 | 803 | // Generate one tick mark for every fixed interval of time. |
285a6bda | 804 | var spacing = Dygraph.SHORT_SPACINGS[granularity]; |
32988383 | 805 | var format = '%d%b'; // e.g. "1 Jan" |
328bb812 | 806 | // TODO(danvk): be smarter about making sure this really hits a "nice" time. |
285a6bda | 807 | if (granularity < Dygraph.HOURLY) { |
328bb812 DV |
808 | start_time = spacing * Math.floor(0.5 + start_time / spacing); |
809 | } | |
32988383 DV |
810 | for (var t = start_time; t <= end_time; t += spacing) { |
811 | var d = new Date(t); | |
812 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); | |
285a6bda | 813 | if (frac == 0 || granularity >= Dygraph.DAILY) { |
32988383 DV |
814 | // the extra hour covers DST problems. |
815 | ticks.push({ v:t, label: new Date(t + 3600*1000).strftime(format) }); | |
816 | } else { | |
817 | ticks.push({ v:t, label: this.hmsString_(t) }); | |
818 | } | |
819 | } | |
820 | } else { | |
821 | // Display a tick mark on the first of a set of months of each year. | |
822 | // Years get a tick mark iff y % year_mod == 0. This is useful for | |
823 | // displaying a tick mark once every 10 years, say, on long time scales. | |
824 | var months; | |
825 | var year_mod = 1; // e.g. to only print one point every 10 years. | |
826 | ||
285a6bda | 827 | if (granularity == Dygraph.MONTHLY) { |
32988383 | 828 | months = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ]; |
285a6bda | 829 | } else if (granularity == Dygraph.QUARTERLY) { |
32988383 | 830 | months = [ 0, 3, 6, 9 ]; |
285a6bda | 831 | } else if (granularity == Dygraph.BIANNUAL) { |
32988383 | 832 | months = [ 0, 6 ]; |
285a6bda | 833 | } else if (granularity == Dygraph.ANNUAL) { |
32988383 | 834 | months = [ 0 ]; |
285a6bda | 835 | } else if (granularity == Dygraph.DECADAL) { |
32988383 DV |
836 | months = [ 0 ]; |
837 | year_mod = 10; | |
838 | } | |
839 | ||
840 | var start_year = new Date(start_time).getFullYear(); | |
841 | var end_year = new Date(end_time).getFullYear(); | |
285a6bda | 842 | var zeropad = Dygraph.zeropad; |
32988383 DV |
843 | for (var i = start_year; i <= end_year; i++) { |
844 | if (i % year_mod != 0) continue; | |
845 | for (var j = 0; j < months.length; j++) { | |
846 | var date_str = i + "/" + zeropad(1 + months[j]) + "/01"; | |
847 | var t = Date.parse(date_str); | |
848 | if (t < start_time || t > end_time) continue; | |
849 | ticks.push({ v:t, label: new Date(t).strftime('%b %y') }); | |
850 | } | |
851 | } | |
852 | } | |
853 | ||
854 | return ticks; | |
855 | }; | |
856 | ||
6a1aa64f DV |
857 | |
858 | /** | |
859 | * Add ticks to the x-axis based on a date range. | |
860 | * @param {Number} startDate Start of the date window (millis since epoch) | |
861 | * @param {Number} endDate End of the date window (millis since epoch) | |
862 | * @return {Array.<Object>} Array of {label, value} tuples. | |
863 | * @public | |
864 | */ | |
285a6bda | 865 | Dygraph.dateTicker = function(startDate, endDate, self) { |
32988383 | 866 | var chosen = -1; |
285a6bda DV |
867 | for (var i = 0; i < Dygraph.NUM_GRANULARITIES; i++) { |
868 | var num_ticks = self.NumXTicks(startDate, endDate, i); | |
869 | if (self.width_ / num_ticks >= self.attr_('pixelsPerXLabel')) { | |
32988383 DV |
870 | chosen = i; |
871 | break; | |
2769de62 | 872 | } |
6a1aa64f DV |
873 | } |
874 | ||
32988383 | 875 | if (chosen >= 0) { |
285a6bda | 876 | return self.GetXAxis(startDate, endDate, chosen); |
6a1aa64f | 877 | } else { |
32988383 | 878 | // TODO(danvk): signal error. |
6a1aa64f | 879 | } |
6a1aa64f DV |
880 | }; |
881 | ||
882 | /** | |
883 | * Add ticks when the x axis has numbers on it (instead of dates) | |
884 | * @param {Number} startDate Start of the date window (millis since epoch) | |
885 | * @param {Number} endDate End of the date window (millis since epoch) | |
886 | * @return {Array.<Object>} Array of {label, value} tuples. | |
887 | * @public | |
888 | */ | |
285a6bda | 889 | Dygraph.numericTicks = function(minV, maxV, self) { |
c6336f04 DV |
890 | // Basic idea: |
891 | // Try labels every 1, 2, 5, 10, 20, 50, 100, etc. | |
892 | // Calculate the resulting tick spacing (i.e. this.height_ / nTicks). | |
285a6bda | 893 | // The first spacing greater than pixelsPerYLabel is what we use. |
c6336f04 DV |
894 | var mults = [1, 2, 5]; |
895 | var scale, low_val, high_val, nTicks; | |
285a6bda DV |
896 | // TODO(danvk): make it possible to set this for x- and y-axes independently. |
897 | var pixelsPerTick = self.attr_('pixelsPerYLabel'); | |
c6336f04 DV |
898 | for (var i = -10; i < 50; i++) { |
899 | var base_scale = Math.pow(10, i); | |
900 | for (var j = 0; j < mults.length; j++) { | |
901 | scale = base_scale * mults[j]; | |
c6336f04 DV |
902 | low_val = Math.floor(minV / scale) * scale; |
903 | high_val = Math.ceil(maxV / scale) * scale; | |
904 | nTicks = (high_val - low_val) / scale; | |
285a6bda | 905 | var spacing = self.height_ / nTicks; |
c6336f04 | 906 | // wish I could break out of both loops at once... |
285a6bda | 907 | if (spacing > pixelsPerTick) break; |
c6336f04 | 908 | } |
285a6bda | 909 | if (spacing > pixelsPerTick) break; |
6a1aa64f DV |
910 | } |
911 | ||
912 | // Construct labels for the ticks | |
913 | var ticks = []; | |
c6336f04 DV |
914 | for (var i = 0; i < nTicks; i++) { |
915 | var tickV = low_val + i * scale; | |
285a6bda DV |
916 | var label = self.round_(tickV, 2); |
917 | if (self.attr_("labelsKMB")) { | |
6a1aa64f DV |
918 | var k = 1000; |
919 | if (tickV >= k*k*k) { | |
285a6bda | 920 | label = self.round_(tickV/(k*k*k), 1) + "B"; |
6a1aa64f | 921 | } else if (tickV >= k*k) { |
285a6bda | 922 | label = self.round_(tickV/(k*k), 1) + "M"; |
6a1aa64f | 923 | } else if (tickV >= k) { |
285a6bda | 924 | label = self.round_(tickV/k, 1) + "K"; |
6a1aa64f DV |
925 | } |
926 | } | |
927 | ticks.push( {label: label, v: tickV} ); | |
928 | } | |
929 | return ticks; | |
930 | }; | |
931 | ||
932 | /** | |
933 | * Adds appropriate ticks on the y-axis | |
934 | * @param {Number} minY The minimum Y value in the data set | |
935 | * @param {Number} maxY The maximum Y value in the data set | |
936 | * @private | |
937 | */ | |
285a6bda | 938 | Dygraph.prototype.addYTicks_ = function(minY, maxY) { |
6a1aa64f | 939 | // Set the number of ticks so that the labels are human-friendly. |
285a6bda DV |
940 | // TODO(danvk): make this an attribute as well. |
941 | var ticks = Dygraph.numericTicks(minY, maxY, this); | |
6a1aa64f DV |
942 | this.layout_.updateOptions( { yAxis: [minY, maxY], |
943 | yTicks: ticks } ); | |
944 | }; | |
945 | ||
946 | /** | |
947 | * Update the graph with new data. Data is in the format | |
948 | * [ [date1, val1, val2, ...], [date2, val1, val2, ...] if errorBars=false | |
949 | * or, if errorBars=true, | |
950 | * [ [date1, [val1,stddev1], [val2,stddev2], ...], [date2, ...], ...] | |
951 | * @param {Array.<Object>} data The data (see above) | |
952 | * @private | |
953 | */ | |
285a6bda | 954 | Dygraph.prototype.drawGraph_ = function(data) { |
6a1aa64f DV |
955 | var maxY = null; |
956 | this.layout_.removeAllDatasets(); | |
285a6bda DV |
957 | this.setColors_(); |
958 | ||
6a1aa64f DV |
959 | // Loop over all fields in the dataset |
960 | for (var i = 1; i < data[0].length; i++) { | |
961 | var series = []; | |
962 | for (var j = 0; j < data.length; j++) { | |
963 | var date = data[j][0]; | |
964 | series[j] = [date, data[j][i]]; | |
965 | } | |
966 | series = this.rollingAverage(series, this.rollPeriod_); | |
967 | ||
968 | // Prune down to the desired range, if necessary (for zooming) | |
285a6bda | 969 | var bars = this.attr_("errorBars") || this.customBars_; |
6a1aa64f DV |
970 | if (this.dateWindow_) { |
971 | var low = this.dateWindow_[0]; | |
972 | var high= this.dateWindow_[1]; | |
973 | var pruned = []; | |
974 | for (var k = 0; k < series.length; k++) { | |
975 | if (series[k][0] >= low && series[k][0] <= high) { | |
976 | pruned.push(series[k]); | |
977 | var y = bars ? series[k][1][0] : series[k][1]; | |
978 | if (maxY == null || y > maxY) maxY = y; | |
979 | } | |
980 | } | |
981 | series = pruned; | |
982 | } else { | |
285a6bda DV |
983 | if (!this.customBars_) { |
984 | for (var j = 0; j < series.length; j++) { | |
985 | var y = bars ? series[j][1][0] : series[j][1]; | |
986 | if (maxY == null || y > maxY) { | |
987 | maxY = bars ? y + series[j][1][1] : y; | |
988 | } | |
989 | } | |
990 | } else { | |
991 | // With custom bars, maxY is the max of the high values. | |
992 | for (var j = 0; j < series.length; j++) { | |
993 | var y = series[j][1][0]; | |
994 | var high = series[j][1][2]; | |
995 | if (high > y) y = high; | |
996 | if (maxY == null || y > maxY) { | |
997 | maxY = y; | |
998 | } | |
6a1aa64f DV |
999 | } |
1000 | } | |
1001 | } | |
1002 | ||
1003 | if (bars) { | |
1004 | var vals = []; | |
1005 | for (var j=0; j<series.length; j++) | |
1006 | vals[j] = [series[j][0], | |
1007 | series[j][1][0], series[j][1][1], series[j][1][2]]; | |
285a6bda | 1008 | this.layout_.addDataset(this.attr_("labels")[i], vals); |
6a1aa64f | 1009 | } else { |
285a6bda | 1010 | this.layout_.addDataset(this.attr_("labels")[i], series); |
6a1aa64f DV |
1011 | } |
1012 | } | |
1013 | ||
1014 | // Use some heuristics to come up with a good maxY value, unless it's been | |
1015 | // set explicitly by the user. | |
1016 | if (this.valueRange_ != null) { | |
1017 | this.addYTicks_(this.valueRange_[0], this.valueRange_[1]); | |
1018 | } else { | |
1019 | // Add some padding and round up to an integer to be human-friendly. | |
1020 | maxY *= 1.1; | |
1021 | if (maxY <= 0.0) maxY = 1.0; | |
6a1aa64f DV |
1022 | this.addYTicks_(0, maxY); |
1023 | } | |
1024 | ||
1025 | this.addXTicks_(); | |
1026 | ||
1027 | // Tell PlotKit to use this new data and render itself | |
1028 | this.layout_.evaluateWithError(); | |
1029 | this.plotter_.clear(); | |
1030 | this.plotter_.render(); | |
1031 | this.canvas_.getContext('2d').clearRect(0, 0, | |
1032 | this.canvas_.width, this.canvas_.height); | |
1033 | }; | |
1034 | ||
1035 | /** | |
1036 | * Calculates the rolling average of a data set. | |
1037 | * If originalData is [label, val], rolls the average of those. | |
1038 | * If originalData is [label, [, it's interpreted as [value, stddev] | |
1039 | * and the roll is returned in the same form, with appropriately reduced | |
1040 | * stddev for each value. | |
1041 | * Note that this is where fractional input (i.e. '5/10') is converted into | |
1042 | * decimal values. | |
1043 | * @param {Array} originalData The data in the appropriate format (see above) | |
1044 | * @param {Number} rollPeriod The number of days over which to average the data | |
1045 | */ | |
285a6bda | 1046 | Dygraph.prototype.rollingAverage = function(originalData, rollPeriod) { |
6a1aa64f DV |
1047 | if (originalData.length < 2) |
1048 | return originalData; | |
1049 | var rollPeriod = Math.min(rollPeriod, originalData.length - 1); | |
1050 | var rollingData = []; | |
285a6bda | 1051 | var sigma = this.attr_("sigma"); |
6a1aa64f DV |
1052 | |
1053 | if (this.fractions_) { | |
1054 | var num = 0; | |
1055 | var den = 0; // numerator/denominator | |
1056 | var mult = 100.0; | |
1057 | for (var i = 0; i < originalData.length; i++) { | |
1058 | num += originalData[i][1][0]; | |
1059 | den += originalData[i][1][1]; | |
1060 | if (i - rollPeriod >= 0) { | |
1061 | num -= originalData[i - rollPeriod][1][0]; | |
1062 | den -= originalData[i - rollPeriod][1][1]; | |
1063 | } | |
1064 | ||
1065 | var date = originalData[i][0]; | |
1066 | var value = den ? num / den : 0.0; | |
285a6bda | 1067 | if (this.attr_("errorBars")) { |
6a1aa64f DV |
1068 | if (this.wilsonInterval_) { |
1069 | // For more details on this confidence interval, see: | |
1070 | // http://en.wikipedia.org/wiki/Binomial_confidence_interval | |
1071 | if (den) { | |
1072 | var p = value < 0 ? 0 : value, n = den; | |
1073 | var pm = sigma * Math.sqrt(p*(1-p)/n + sigma*sigma/(4*n*n)); | |
1074 | var denom = 1 + sigma * sigma / den; | |
1075 | var low = (p + sigma * sigma / (2 * den) - pm) / denom; | |
1076 | var high = (p + sigma * sigma / (2 * den) + pm) / denom; | |
1077 | rollingData[i] = [date, | |
1078 | [p * mult, (p - low) * mult, (high - p) * mult]]; | |
1079 | } else { | |
1080 | rollingData[i] = [date, [0, 0, 0]]; | |
1081 | } | |
1082 | } else { | |
1083 | var stddev = den ? sigma * Math.sqrt(value * (1 - value) / den) : 1.0; | |
1084 | rollingData[i] = [date, [mult * value, mult * stddev, mult * stddev]]; | |
1085 | } | |
1086 | } else { | |
1087 | rollingData[i] = [date, mult * value]; | |
1088 | } | |
1089 | } | |
1090 | } else if (this.customBars_) { | |
f6885d6a DV |
1091 | var low = 0; |
1092 | var mid = 0; | |
1093 | var high = 0; | |
1094 | var count = 0; | |
6a1aa64f DV |
1095 | for (var i = 0; i < originalData.length; i++) { |
1096 | var data = originalData[i][1]; | |
1097 | var y = data[1]; | |
1098 | rollingData[i] = [originalData[i][0], [y, y - data[0], data[2] - y]]; | |
f6885d6a DV |
1099 | |
1100 | low += data[0]; | |
1101 | mid += y; | |
1102 | high += data[2]; | |
1103 | count += 1; | |
1104 | if (i - rollPeriod >= 0) { | |
1105 | var prev = originalData[i - rollPeriod]; | |
1106 | low -= prev[1][0]; | |
1107 | mid -= prev[1][1]; | |
1108 | high -= prev[1][2]; | |
1109 | count -= 1; | |
1110 | } | |
1111 | rollingData[i] = [originalData[i][0], [ 1.0 * mid / count, | |
1112 | 1.0 * (mid - low) / count, | |
1113 | 1.0 * (high - mid) / count ]]; | |
2769de62 | 1114 | } |
6a1aa64f DV |
1115 | } else { |
1116 | // Calculate the rolling average for the first rollPeriod - 1 points where | |
1117 | // there is not enough data to roll over the full number of days | |
1118 | var num_init_points = Math.min(rollPeriod - 1, originalData.length - 2); | |
285a6bda | 1119 | if (!this.attr_("errorBars")){ |
6a1aa64f DV |
1120 | for (var i = 0; i < num_init_points; i++) { |
1121 | var sum = 0; | |
1122 | for (var j = 0; j < i + 1; j++) | |
1123 | sum += originalData[j][1]; | |
1124 | rollingData[i] = [originalData[i][0], sum / (i + 1)]; | |
1125 | } | |
1126 | // Calculate the rolling average for the remaining points | |
1127 | for (var i = Math.min(rollPeriod - 1, originalData.length - 2); | |
1128 | i < originalData.length; | |
1129 | i++) { | |
1130 | var sum = 0; | |
1131 | for (var j = i - rollPeriod + 1; j < i + 1; j++) | |
1132 | sum += originalData[j][1]; | |
1133 | rollingData[i] = [originalData[i][0], sum / rollPeriod]; | |
1134 | } | |
1135 | } else { | |
1136 | for (var i = 0; i < num_init_points; i++) { | |
1137 | var sum = 0; | |
1138 | var variance = 0; | |
1139 | for (var j = 0; j < i + 1; j++) { | |
1140 | sum += originalData[j][1][0]; | |
1141 | variance += Math.pow(originalData[j][1][1], 2); | |
1142 | } | |
1143 | var stddev = Math.sqrt(variance)/(i+1); | |
1144 | rollingData[i] = [originalData[i][0], | |
1145 | [sum/(i+1), sigma * stddev, sigma * stddev]]; | |
1146 | } | |
1147 | // Calculate the rolling average for the remaining points | |
1148 | for (var i = Math.min(rollPeriod - 1, originalData.length - 2); | |
1149 | i < originalData.length; | |
1150 | i++) { | |
1151 | var sum = 0; | |
1152 | var variance = 0; | |
1153 | for (var j = i - rollPeriod + 1; j < i + 1; j++) { | |
1154 | sum += originalData[j][1][0]; | |
1155 | variance += Math.pow(originalData[j][1][1], 2); | |
1156 | } | |
1157 | var stddev = Math.sqrt(variance) / rollPeriod; | |
1158 | rollingData[i] = [originalData[i][0], | |
1159 | [sum / rollPeriod, sigma * stddev, sigma * stddev]]; | |
1160 | } | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | return rollingData; | |
1165 | }; | |
1166 | ||
1167 | /** | |
1168 | * Parses a date, returning the number of milliseconds since epoch. This can be | |
285a6bda DV |
1169 | * passed in as an xValueParser in the Dygraph constructor. |
1170 | * TODO(danvk): enumerate formats that this understands. | |
6a1aa64f DV |
1171 | * @param {String} A date in YYYYMMDD format. |
1172 | * @return {Number} Milliseconds since epoch. | |
1173 | * @public | |
1174 | */ | |
285a6bda | 1175 | Dygraph.dateParser = function(dateStr, self) { |
6a1aa64f | 1176 | var dateStrSlashed; |
285a6bda | 1177 | var d; |
2769de62 | 1178 | if (dateStr.length == 10 && dateStr.search("-") != -1) { // e.g. '2009-07-12' |
6a1aa64f | 1179 | dateStrSlashed = dateStr.replace("-", "/", "g"); |
353a0294 DV |
1180 | while (dateStrSlashed.search("-") != -1) { |
1181 | dateStrSlashed = dateStrSlashed.replace("-", "/"); | |
1182 | } | |
285a6bda | 1183 | d = Date.parse(dateStrSlashed); |
2769de62 | 1184 | } else if (dateStr.length == 8) { // e.g. '20090712' |
285a6bda | 1185 | // TODO(danvk): remove support for this format. It's confusing. |
6a1aa64f DV |
1186 | dateStrSlashed = dateStr.substr(0,4) + "/" + dateStr.substr(4,2) |
1187 | + "/" + dateStr.substr(6,2); | |
285a6bda | 1188 | d = Date.parse(dateStrSlashed); |
2769de62 DV |
1189 | } else { |
1190 | // Any format that Date.parse will accept, e.g. "2009/07/12" or | |
1191 | // "2009/07/12 12:34:56" | |
285a6bda DV |
1192 | d = Date.parse(dateStr); |
1193 | } | |
1194 | ||
1195 | if (!d || isNaN(d)) { | |
1196 | self.error("Couldn't parse " + dateStr + " as a date"); | |
1197 | } | |
1198 | return d; | |
1199 | }; | |
1200 | ||
1201 | /** | |
1202 | * Detects the type of the str (date or numeric) and sets the various | |
1203 | * formatting attributes in this.attrs_ based on this type. | |
1204 | * @param {String} str An x value. | |
1205 | * @private | |
1206 | */ | |
1207 | Dygraph.prototype.detectTypeFromString_ = function(str) { | |
1208 | var isDate = false; | |
1209 | if (str.indexOf('-') >= 0 || | |
1210 | str.indexOf('/') >= 0 || | |
1211 | isNaN(parseFloat(str))) { | |
1212 | isDate = true; | |
1213 | } else if (str.length == 8 && str > '19700101' && str < '20371231') { | |
1214 | // TODO(danvk): remove support for this format. | |
1215 | isDate = true; | |
1216 | } | |
1217 | ||
1218 | if (isDate) { | |
1219 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1220 | this.attrs_.xValueParser = Dygraph.dateParser; | |
1221 | this.attrs_.xTicker = Dygraph.dateTicker; | |
1222 | } else { | |
1223 | this.attrs_.xValueFormatter = function(x) { return x; }; | |
1224 | this.attrs_.xValueParser = function(x) { return parseFloat(x); }; | |
1225 | this.attrs_.xTicker = Dygraph.numericTicks; | |
6a1aa64f | 1226 | } |
6a1aa64f DV |
1227 | }; |
1228 | ||
1229 | /** | |
1230 | * Parses a string in a special csv format. We expect a csv file where each | |
1231 | * line is a date point, and the first field in each line is the date string. | |
1232 | * We also expect that all remaining fields represent series. | |
285a6bda | 1233 | * if the errorBars attribute is set, then interpret the fields as: |
6a1aa64f DV |
1234 | * date, series1, stddev1, series2, stddev2, ... |
1235 | * @param {Array.<Object>} data See above. | |
1236 | * @private | |
285a6bda DV |
1237 | * |
1238 | * @return Array.<Object> An array with one entry for each row. These entries | |
1239 | * are an array of cells in that row. The first entry is the parsed x-value for | |
1240 | * the row. The second, third, etc. are the y-values. These can take on one of | |
1241 | * three forms, depending on the CSV and constructor parameters: | |
1242 | * 1. numeric value | |
1243 | * 2. [ value, stddev ] | |
1244 | * 3. [ low value, center value, high value ] | |
6a1aa64f | 1245 | */ |
285a6bda | 1246 | Dygraph.prototype.parseCSV_ = function(data) { |
6a1aa64f DV |
1247 | var ret = []; |
1248 | var lines = data.split("\n"); | |
285a6bda | 1249 | var start = 0; |
6a1aa64f | 1250 | if (this.labelsFromCSV_) { |
285a6bda DV |
1251 | start = 1; |
1252 | this.attrs_.labels = lines[0].split(","); | |
6a1aa64f DV |
1253 | } |
1254 | ||
285a6bda DV |
1255 | var xParser; |
1256 | var defaultParserSet = false; // attempt to auto-detect x value type | |
1257 | var expectedCols = this.attr_("labels").length; | |
6a1aa64f DV |
1258 | for (var i = start; i < lines.length; i++) { |
1259 | var line = lines[i]; | |
1260 | if (line.length == 0) continue; // skip blank lines | |
1261 | var inFields = line.split(','); | |
285a6bda | 1262 | if (inFields.length < 2) continue; |
6a1aa64f DV |
1263 | |
1264 | var fields = []; | |
285a6bda DV |
1265 | if (!defaultParserSet) { |
1266 | this.detectTypeFromString_(inFields[0]); | |
1267 | xParser = this.attr_("xValueParser"); | |
1268 | defaultParserSet = true; | |
1269 | } | |
1270 | fields[0] = xParser(inFields[0], this); | |
6a1aa64f DV |
1271 | |
1272 | // If fractions are expected, parse the numbers as "A/B" | |
1273 | if (this.fractions_) { | |
1274 | for (var j = 1; j < inFields.length; j++) { | |
1275 | // TODO(danvk): figure out an appropriate way to flag parse errors. | |
1276 | var vals = inFields[j].split("/"); | |
1277 | fields[j] = [parseFloat(vals[0]), parseFloat(vals[1])]; | |
1278 | } | |
285a6bda | 1279 | } else if (this.attr_("errorBars")) { |
6a1aa64f DV |
1280 | // If there are error bars, values are (value, stddev) pairs |
1281 | for (var j = 1; j < inFields.length; j += 2) | |
1282 | fields[(j + 1) / 2] = [parseFloat(inFields[j]), | |
1283 | parseFloat(inFields[j + 1])]; | |
1284 | } else if (this.customBars_) { | |
1285 | // Bars are a low;center;high tuple | |
1286 | for (var j = 1; j < inFields.length; j++) { | |
1287 | var vals = inFields[j].split(";"); | |
1288 | fields[j] = [ parseFloat(vals[0]), | |
1289 | parseFloat(vals[1]), | |
1290 | parseFloat(vals[2]) ]; | |
1291 | } | |
1292 | } else { | |
1293 | // Values are just numbers | |
285a6bda | 1294 | for (var j = 1; j < inFields.length; j++) { |
6a1aa64f | 1295 | fields[j] = parseFloat(inFields[j]); |
285a6bda | 1296 | } |
6a1aa64f DV |
1297 | } |
1298 | ret.push(fields); | |
285a6bda DV |
1299 | |
1300 | if (fields.length != expectedCols) { | |
1301 | this.error("Number of columns in line " + i + " (" + fields.length + | |
1302 | ") does not agree with number of labels (" + expectedCols + | |
1303 | ") " + line); | |
1304 | } | |
6a1aa64f DV |
1305 | } |
1306 | return ret; | |
1307 | }; | |
1308 | ||
1309 | /** | |
285a6bda DV |
1310 | * The user has provided their data as a pre-packaged JS array. If the x values |
1311 | * are numeric, this is the same as dygraphs' internal format. If the x values | |
1312 | * are dates, we need to convert them from Date objects to ms since epoch. | |
1313 | * @param {Array.<Object>} data | |
1314 | * @return {Array.<Object>} data with numeric x values. | |
1315 | */ | |
1316 | Dygraph.prototype.parseArray_ = function(data) { | |
1317 | // Peek at the first x value to see if it's numeric. | |
1318 | if (data.length == 0) { | |
1319 | this.error("Can't plot empty data set"); | |
1320 | return null; | |
1321 | } | |
1322 | if (data[0].length == 0) { | |
1323 | this.error("Data set cannot contain an empty row"); | |
1324 | return null; | |
1325 | } | |
1326 | ||
1327 | if (this.attr_("labels") == null) { | |
1328 | this.warn("Using default labels. Set labels explicitly via 'labels' " + | |
1329 | "in the options parameter"); | |
1330 | this.attrs_.labels = [ "X" ]; | |
1331 | for (var i = 1; i < data[0].length; i++) { | |
1332 | this.attrs_.labels.push("Y" + i); | |
1333 | } | |
1334 | } | |
1335 | ||
1336 | if (MochiKit.Base.isDateLike(data[0][0])) { | |
1337 | // Some intelligent defaults for a date x-axis. | |
1338 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1339 | this.attrs_.xTicker = Dygraph.dateTicker; | |
1340 | ||
1341 | // Assume they're all dates. | |
1342 | var parsedData = MochiKit.Base.clone(data); | |
1343 | for (var i = 0; i < data.length; i++) { | |
1344 | if (parsedData[i].length == 0) { | |
1345 | this.error("Row " << (1 + i) << " of data is empty"); | |
1346 | return null; | |
1347 | } | |
1348 | if (parsedData[i][0] == null | |
1349 | || typeof(parsedData[i][0].getTime) != 'function') { | |
1350 | this.error("x value in row " << (1 + i) << " is not a Date"); | |
1351 | return null; | |
1352 | } | |
1353 | parsedData[i][0] = parsedData[i][0].getTime(); | |
1354 | } | |
1355 | return parsedData; | |
1356 | } else { | |
1357 | // Some intelligent defaults for a numeric x-axis. | |
1358 | this.attrs_.xValueFormatter = function(x) { return x; }; | |
1359 | this.attrs_.xTicker = Dygraph.numericTicks; | |
1360 | return data; | |
1361 | } | |
1362 | }; | |
1363 | ||
1364 | /** | |
79420a1e DV |
1365 | * Parses a DataTable object from gviz. |
1366 | * The data is expected to have a first column that is either a date or a | |
1367 | * number. All subsequent columns must be numbers. If there is a clear mismatch | |
1368 | * between this.xValueParser_ and the type of the first column, it will be | |
1369 | * fixed. Returned value is in the same format as return value of parseCSV_. | |
1370 | * @param {Array.<Object>} data See above. | |
1371 | * @private | |
1372 | */ | |
285a6bda | 1373 | Dygraph.prototype.parseDataTable_ = function(data) { |
79420a1e DV |
1374 | var cols = data.getNumberOfColumns(); |
1375 | var rows = data.getNumberOfRows(); | |
1376 | ||
1377 | // Read column labels | |
1378 | var labels = []; | |
1379 | for (var i = 0; i < cols; i++) { | |
1380 | labels.push(data.getColumnLabel(i)); | |
1381 | } | |
285a6bda | 1382 | this.attrs_.labels = labels; |
79420a1e | 1383 | |
d955e223 | 1384 | var indepType = data.getColumnType(0); |
285a6bda DV |
1385 | if (indepType == 'date') { |
1386 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1387 | this.attrs_.xValueParser = Dygraph.dateParser; | |
1388 | this.attrs_.xTicker = Dygraph.dateTicker; | |
1389 | } else if (indepType != 'number') { | |
1390 | this.attrs_.xValueFormatter = function(x) { return x; }; | |
1391 | this.attrs_.xValueParser = function(x) { return parseFloat(x); }; | |
1392 | this.attrs_.xTicker = Dygraph.numericTicks; | |
1393 | } else { | |
1394 | this.error("only 'date' and 'number' types are supported for column 1" + | |
1395 | "of DataTable input (Got '" + indepType + "')"); | |
79420a1e DV |
1396 | return null; |
1397 | } | |
1398 | ||
1399 | var ret = []; | |
1400 | for (var i = 0; i < rows; i++) { | |
1401 | var row = []; | |
d955e223 DV |
1402 | if (indepType == 'date') { |
1403 | row.push(data.getValue(i, 0).getTime()); | |
1404 | } else { | |
1405 | row.push(data.getValue(i, 0)); | |
1406 | } | |
79420a1e DV |
1407 | for (var j = 1; j < cols; j++) { |
1408 | row.push(data.getValue(i, j)); | |
1409 | } | |
1410 | ret.push(row); | |
1411 | } | |
1412 | return ret; | |
1413 | } | |
1414 | ||
1415 | /** | |
6a1aa64f DV |
1416 | * Get the CSV data. If it's in a function, call that function. If it's in a |
1417 | * file, do an XMLHttpRequest to get it. | |
1418 | * @private | |
1419 | */ | |
285a6bda | 1420 | Dygraph.prototype.start_ = function() { |
6a1aa64f | 1421 | if (typeof this.file_ == 'function') { |
285a6bda | 1422 | // CSV string. Pretend we got it via XHR. |
6a1aa64f | 1423 | this.loadedEvent_(this.file_()); |
285a6bda DV |
1424 | } else if (MochiKit.Base.isArrayLike(this.file_)) { |
1425 | this.rawData_ = this.parseArray_(this.file_); | |
1426 | this.drawGraph_(this.rawData_); | |
79420a1e DV |
1427 | } else if (typeof this.file_ == 'object' && |
1428 | typeof this.file_.getColumnRange == 'function') { | |
1429 | // must be a DataTable from gviz. | |
1430 | this.rawData_ = this.parseDataTable_(this.file_); | |
1431 | this.drawGraph_(this.rawData_); | |
285a6bda DV |
1432 | } else if (typeof this.file_ == 'string') { |
1433 | // Heuristic: a newline means it's CSV data. Otherwise it's an URL. | |
1434 | if (this.file_.indexOf('\n') >= 0) { | |
1435 | this.loadedEvent_(this.file_); | |
1436 | } else { | |
1437 | var req = new XMLHttpRequest(); | |
1438 | var caller = this; | |
1439 | req.onreadystatechange = function () { | |
1440 | if (req.readyState == 4) { | |
1441 | if (req.status == 200) { | |
1442 | caller.loadedEvent_(req.responseText); | |
1443 | } | |
6a1aa64f | 1444 | } |
285a6bda | 1445 | }; |
6a1aa64f | 1446 | |
285a6bda DV |
1447 | req.open("GET", this.file_, true); |
1448 | req.send(null); | |
1449 | } | |
1450 | } else { | |
1451 | this.error("Unknown data format: " + (typeof this.file_)); | |
6a1aa64f DV |
1452 | } |
1453 | }; | |
1454 | ||
1455 | /** | |
1456 | * Changes various properties of the graph. These can include: | |
1457 | * <ul> | |
1458 | * <li>file: changes the source data for the graph</li> | |
1459 | * <li>errorBars: changes whether the data contains stddev</li> | |
1460 | * </ul> | |
1461 | * @param {Object} attrs The new properties and values | |
1462 | */ | |
285a6bda DV |
1463 | Dygraph.prototype.updateOptions = function(attrs) { |
1464 | // TODO(danvk): this is a mess. Rethink this function. | |
6a1aa64f DV |
1465 | if (attrs.customBars) { |
1466 | this.customBars_ = attrs.customBars; | |
1467 | } | |
6a1aa64f DV |
1468 | if (attrs.rollPeriod) { |
1469 | this.rollPeriod_ = attrs.rollPeriod; | |
1470 | } | |
1471 | if (attrs.dateWindow) { | |
1472 | this.dateWindow_ = attrs.dateWindow; | |
1473 | } | |
1474 | if (attrs.valueRange) { | |
1475 | this.valueRange_ = attrs.valueRange; | |
1476 | } | |
285a6bda DV |
1477 | MochiKit.Base.update(this.user_attrs_, attrs); |
1478 | ||
1479 | this.labelsFromCSV_ = (this.attr_("labels") == null); | |
1480 | ||
1481 | // TODO(danvk): this doesn't match the constructor logic | |
1482 | this.layout_.updateOptions({ 'errorBars': this.attr_("errorBars") }); | |
6a1aa64f DV |
1483 | if (attrs['file'] && attrs['file'] != this.file_) { |
1484 | this.file_ = attrs['file']; | |
1485 | this.start_(); | |
1486 | } else { | |
1487 | this.drawGraph_(this.rawData_); | |
1488 | } | |
1489 | }; | |
1490 | ||
1491 | /** | |
1492 | * Adjusts the number of days in the rolling average. Updates the graph to | |
1493 | * reflect the new averaging period. | |
1494 | * @param {Number} length Number of days over which to average the data. | |
1495 | */ | |
285a6bda | 1496 | Dygraph.prototype.adjustRoll = function(length) { |
6a1aa64f DV |
1497 | this.rollPeriod_ = length; |
1498 | this.drawGraph_(this.rawData_); | |
1499 | }; | |
540d00f1 DV |
1500 | |
1501 | ||
1502 | /** | |
285a6bda | 1503 | * A wrapper around Dygraph that implements the gviz API. |
540d00f1 DV |
1504 | * @param {Object} container The DOM object the visualization should live in. |
1505 | */ | |
285a6bda | 1506 | Dygraph.GVizChart = function(container) { |
540d00f1 DV |
1507 | this.container = container; |
1508 | } | |
1509 | ||
285a6bda | 1510 | Dygraph.GVizChart.prototype.draw = function(data, options) { |
540d00f1 | 1511 | this.container.innerHTML = ''; |
285a6bda | 1512 | this.date_graph = new Dygraph(this.container, data, options); |
540d00f1 | 1513 | } |
285a6bda DV |
1514 | |
1515 | // Older pages may still use this name. | |
1516 | DateGraph = Dygraph; |