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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, | |
afefbcdb | 94 | labelsKMG2: false, |
285a6bda DV |
95 | |
96 | strokeWidth: 1.0, | |
8e4a6af3 | 97 | |
8846615a DV |
98 | axisTickSize: 3, |
99 | axisLabelFontSize: 14, | |
100 | xAxisLabelWidth: 50, | |
101 | yAxisLabelWidth: 50, | |
102 | rightGap: 5, | |
285a6bda DV |
103 | |
104 | showRoller: false, | |
105 | xValueFormatter: Dygraph.dateString_, | |
106 | xValueParser: Dygraph.dateParser, | |
107 | xTicker: Dygraph.dateTicker, | |
108 | ||
3d67f03b DV |
109 | delimiter: ',', |
110 | ||
285a6bda DV |
111 | sigma: 2.0, |
112 | errorBars: false, | |
113 | fractions: false, | |
114 | wilsonInterval: true, // only relevant if fractions is true | |
5954ef32 DV |
115 | customBars: false, |
116 | fillGraph: false | |
285a6bda DV |
117 | }; |
118 | ||
119 | // Various logging levels. | |
120 | Dygraph.DEBUG = 1; | |
121 | Dygraph.INFO = 2; | |
122 | Dygraph.WARNING = 3; | |
123 | Dygraph.ERROR = 3; | |
124 | ||
125 | Dygraph.prototype.__old_init__ = function(div, file, labels, attrs) { | |
126 | // Labels is no longer a constructor parameter, since it's typically set | |
127 | // directly from the data source. It also conains a name for the x-axis, | |
128 | // which the previous constructor form did not. | |
129 | if (labels != null) { | |
130 | var new_labels = ["Date"]; | |
131 | for (var i = 0; i < labels.length; i++) new_labels.push(labels[i]); | |
fc80a396 | 132 | Dygraph.update(attrs, { 'labels': new_labels }); |
285a6bda DV |
133 | } |
134 | this.__init__(div, file, attrs); | |
8e4a6af3 DV |
135 | }; |
136 | ||
6a1aa64f | 137 | /** |
285a6bda | 138 | * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit |
6a1aa64f DV |
139 | * and interaction <canvas> inside of it. See the constructor for details |
140 | * on the parameters. | |
141 | * @param {String | Function} file Source data | |
142 | * @param {Array.<String>} labels Names of the data series | |
143 | * @param {Object} attrs Miscellaneous other options | |
144 | * @private | |
145 | */ | |
285a6bda DV |
146 | Dygraph.prototype.__init__ = function(div, file, attrs) { |
147 | // Support two-argument constructor | |
148 | if (attrs == null) { attrs = {}; } | |
149 | ||
6a1aa64f | 150 | // Copy the important bits into the object |
32988383 | 151 | // TODO(danvk): most of these should just stay in the attrs_ dictionary. |
6a1aa64f | 152 | this.maindiv_ = div; |
6a1aa64f | 153 | this.file_ = file; |
285a6bda | 154 | this.rollPeriod_ = attrs.rollPeriod || Dygraph.DEFAULT_ROLL_PERIOD; |
6a1aa64f | 155 | this.previousVerticalX_ = -1; |
6a1aa64f | 156 | this.fractions_ = attrs.fractions || false; |
6a1aa64f DV |
157 | this.dateWindow_ = attrs.dateWindow || null; |
158 | this.valueRange_ = attrs.valueRange || null; | |
6a1aa64f | 159 | this.wilsonInterval_ = attrs.wilsonInterval || true; |
8e4a6af3 | 160 | |
f7d6278e DV |
161 | // Clear the div. This ensure that, if multiple dygraphs are passed the same |
162 | // div, then only one will be drawn. | |
163 | div.innerHTML = ""; | |
164 | ||
285a6bda DV |
165 | // If the div isn't already sized then give it a default size. |
166 | if (div.style.width == '') { | |
167 | div.style.width = Dygraph.DEFAULT_WIDTH + "px"; | |
168 | } | |
169 | if (div.style.height == '') { | |
170 | div.style.height = Dygraph.DEFAULT_HEIGHT + "px"; | |
32988383 | 171 | } |
285a6bda DV |
172 | this.width_ = parseInt(div.style.width, 10); |
173 | this.height_ = parseInt(div.style.height, 10); | |
32988383 | 174 | |
285a6bda DV |
175 | // Dygraphs has many options, some of which interact with one another. |
176 | // To keep track of everything, we maintain two sets of options: | |
177 | // | |
178 | // this.user_attrs_ only options explicitly set by the user. | |
179 | // this.attrs_ defaults, options derived from user_attrs_, data. | |
180 | // | |
181 | // Options are then accessed this.attr_('attr'), which first looks at | |
182 | // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent | |
183 | // defaults without overriding behavior that the user specifically asks for. | |
184 | this.user_attrs_ = {}; | |
fc80a396 | 185 | Dygraph.update(this.user_attrs_, attrs); |
6a1aa64f | 186 | |
285a6bda | 187 | this.attrs_ = {}; |
fc80a396 | 188 | Dygraph.update(this.attrs_, Dygraph.DEFAULT_ATTRS); |
6a1aa64f | 189 | |
285a6bda DV |
190 | // Make a note of whether labels will be pulled from the CSV file. |
191 | this.labelsFromCSV_ = (this.attr_("labels") == null); | |
6a1aa64f DV |
192 | |
193 | // Create the containing DIV and other interactive elements | |
194 | this.createInterface_(); | |
195 | ||
738fc797 | 196 | this.start_(); |
6a1aa64f DV |
197 | }; |
198 | ||
285a6bda DV |
199 | Dygraph.prototype.attr_ = function(name) { |
200 | if (typeof(this.user_attrs_[name]) != 'undefined') { | |
201 | return this.user_attrs_[name]; | |
202 | } else if (typeof(this.attrs_[name]) != 'undefined') { | |
203 | return this.attrs_[name]; | |
204 | } else { | |
205 | return null; | |
206 | } | |
207 | }; | |
208 | ||
209 | // TODO(danvk): any way I can get the line numbers to be this.warn call? | |
210 | Dygraph.prototype.log = function(severity, message) { | |
211 | if (typeof(console) != 'undefined') { | |
212 | switch (severity) { | |
213 | case Dygraph.DEBUG: | |
214 | console.debug('dygraphs: ' + message); | |
215 | break; | |
216 | case Dygraph.INFO: | |
217 | console.info('dygraphs: ' + message); | |
218 | break; | |
219 | case Dygraph.WARNING: | |
220 | console.warn('dygraphs: ' + message); | |
221 | break; | |
222 | case Dygraph.ERROR: | |
223 | console.error('dygraphs: ' + message); | |
224 | break; | |
225 | } | |
226 | } | |
227 | } | |
228 | Dygraph.prototype.info = function(message) { | |
229 | this.log(Dygraph.INFO, message); | |
230 | } | |
231 | Dygraph.prototype.warn = function(message) { | |
232 | this.log(Dygraph.WARNING, message); | |
233 | } | |
234 | Dygraph.prototype.error = function(message) { | |
235 | this.log(Dygraph.ERROR, message); | |
236 | } | |
237 | ||
6a1aa64f DV |
238 | /** |
239 | * Returns the current rolling period, as set by the user or an option. | |
240 | * @return {Number} The number of days in the rolling window | |
241 | */ | |
285a6bda | 242 | Dygraph.prototype.rollPeriod = function() { |
6a1aa64f | 243 | return this.rollPeriod_; |
76171648 DV |
244 | }; |
245 | ||
246 | Dygraph.addEvent = function(el, evt, fn) { | |
247 | var normed_fn = function(e) { | |
248 | if (!e) var e = window.event; | |
249 | fn(e); | |
250 | }; | |
251 | if (window.addEventListener) { // Mozilla, Netscape, Firefox | |
252 | el.addEventListener(evt, normed_fn, false); | |
253 | } else { // IE | |
254 | el.attachEvent('on' + evt, normed_fn); | |
255 | } | |
256 | }; | |
6a1aa64f DV |
257 | |
258 | /** | |
285a6bda | 259 | * Generates interface elements for the Dygraph: a containing div, a div to |
6a1aa64f | 260 | * display the current point, and a textbox to adjust the rolling average |
697e70b2 | 261 | * period. Also creates the Renderer/Layout elements. |
6a1aa64f DV |
262 | * @private |
263 | */ | |
285a6bda | 264 | Dygraph.prototype.createInterface_ = function() { |
6a1aa64f DV |
265 | // Create the all-enclosing graph div |
266 | var enclosing = this.maindiv_; | |
267 | ||
b0c3b730 DV |
268 | this.graphDiv = document.createElement("div"); |
269 | this.graphDiv.style.width = this.width_ + "px"; | |
270 | this.graphDiv.style.height = this.height_ + "px"; | |
271 | enclosing.appendChild(this.graphDiv); | |
272 | ||
273 | // Create the canvas for interactive parts of the chart. | |
f8cfec73 DV |
274 | // this.canvas_ = document.createElement("canvas"); |
275 | this.canvas_ = Dygraph.createCanvas(); | |
b0c3b730 DV |
276 | this.canvas_.style.position = "absolute"; |
277 | this.canvas_.width = this.width_; | |
278 | this.canvas_.height = this.height_; | |
f8cfec73 DV |
279 | this.canvas_.style.width = this.width_ + "px"; // for IE |
280 | this.canvas_.style.height = this.height_ + "px"; // for IE | |
b0c3b730 DV |
281 | this.graphDiv.appendChild(this.canvas_); |
282 | ||
283 | // ... and for static parts of the chart. | |
6a1aa64f | 284 | this.hidden_ = this.createPlotKitCanvas_(this.canvas_); |
76171648 DV |
285 | |
286 | var dygraph = this; | |
287 | Dygraph.addEvent(this.hidden_, 'mousemove', function(e) { | |
288 | dygraph.mouseMove_(e); | |
289 | }); | |
290 | Dygraph.addEvent(this.hidden_, 'mouseout', function(e) { | |
291 | dygraph.mouseOut_(e); | |
292 | }); | |
697e70b2 DV |
293 | |
294 | // Create the grapher | |
295 | // TODO(danvk): why does the Layout need its own set of options? | |
296 | this.layoutOptions_ = { 'xOriginIsZero': false }; | |
297 | Dygraph.update(this.layoutOptions_, this.attrs_); | |
298 | Dygraph.update(this.layoutOptions_, this.user_attrs_); | |
299 | Dygraph.update(this.layoutOptions_, { | |
300 | 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) }); | |
301 | ||
302 | this.layout_ = new DygraphLayout(this, this.layoutOptions_); | |
303 | ||
304 | // TODO(danvk): why does the Renderer need its own set of options? | |
305 | this.renderOptions_ = { colorScheme: this.colors_, | |
306 | strokeColor: null, | |
307 | axisLineWidth: Dygraph.AXIS_LINE_WIDTH }; | |
308 | Dygraph.update(this.renderOptions_, this.attrs_); | |
309 | Dygraph.update(this.renderOptions_, this.user_attrs_); | |
310 | this.plotter_ = new DygraphCanvasRenderer(this, | |
311 | this.hidden_, this.layout_, | |
312 | this.renderOptions_); | |
313 | ||
314 | this.createStatusMessage_(); | |
315 | this.createRollInterface_(); | |
316 | this.createDragInterface_(); | |
6a1aa64f DV |
317 | } |
318 | ||
319 | /** | |
320 | * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on | |
285a6bda | 321 | * this particular canvas. All Dygraph work is done on this.canvas_. |
8846615a | 322 | * @param {Object} canvas The Dygraph canvas over which to overlay the plot |
6a1aa64f DV |
323 | * @return {Object} The newly-created canvas |
324 | * @private | |
325 | */ | |
285a6bda | 326 | Dygraph.prototype.createPlotKitCanvas_ = function(canvas) { |
f8cfec73 DV |
327 | // var h = document.createElement("canvas"); |
328 | var h = Dygraph.createCanvas(); | |
6a1aa64f DV |
329 | h.style.position = "absolute"; |
330 | h.style.top = canvas.style.top; | |
331 | h.style.left = canvas.style.left; | |
332 | h.width = this.width_; | |
333 | h.height = this.height_; | |
f8cfec73 DV |
334 | h.style.width = this.width_ + "px"; // for IE |
335 | h.style.height = this.height_ + "px"; // for IE | |
b0c3b730 | 336 | this.graphDiv.appendChild(h); |
6a1aa64f DV |
337 | return h; |
338 | }; | |
339 | ||
f474c2a3 DV |
340 | // Taken from MochiKit.Color |
341 | Dygraph.hsvToRGB = function (hue, saturation, value) { | |
342 | var red; | |
343 | var green; | |
344 | var blue; | |
345 | if (saturation === 0) { | |
346 | red = value; | |
347 | green = value; | |
348 | blue = value; | |
349 | } else { | |
350 | var i = Math.floor(hue * 6); | |
351 | var f = (hue * 6) - i; | |
352 | var p = value * (1 - saturation); | |
353 | var q = value * (1 - (saturation * f)); | |
354 | var t = value * (1 - (saturation * (1 - f))); | |
355 | switch (i) { | |
356 | case 1: red = q; green = value; blue = p; break; | |
357 | case 2: red = p; green = value; blue = t; break; | |
358 | case 3: red = p; green = q; blue = value; break; | |
359 | case 4: red = t; green = p; blue = value; break; | |
360 | case 5: red = value; green = p; blue = q; break; | |
361 | case 6: // fall through | |
362 | case 0: red = value; green = t; blue = p; break; | |
363 | } | |
364 | } | |
365 | red = Math.floor(255 * red + 0.5); | |
366 | green = Math.floor(255 * green + 0.5); | |
367 | blue = Math.floor(255 * blue + 0.5); | |
368 | return 'rgb(' + red + ',' + green + ',' + blue + ')'; | |
369 | }; | |
370 | ||
371 | ||
6a1aa64f DV |
372 | /** |
373 | * Generate a set of distinct colors for the data series. This is done with a | |
374 | * color wheel. Saturation/Value are customizable, and the hue is | |
375 | * equally-spaced around the color wheel. If a custom set of colors is | |
376 | * specified, that is used instead. | |
6a1aa64f DV |
377 | * @private |
378 | */ | |
285a6bda DV |
379 | Dygraph.prototype.setColors_ = function() { |
380 | // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do | |
381 | // away with this.renderOptions_. | |
382 | var num = this.attr_("labels").length - 1; | |
6a1aa64f | 383 | this.colors_ = []; |
285a6bda DV |
384 | var colors = this.attr_('colors'); |
385 | if (!colors) { | |
386 | var sat = this.attr_('colorSaturation') || 1.0; | |
387 | var val = this.attr_('colorValue') || 0.5; | |
6a1aa64f DV |
388 | for (var i = 1; i <= num; i++) { |
389 | var hue = (1.0*i/(1+num)); | |
f474c2a3 | 390 | this.colors_.push( Dygraph.hsvToRGB(hue, sat, val) ); |
6a1aa64f DV |
391 | } |
392 | } else { | |
393 | for (var i = 0; i < num; i++) { | |
285a6bda | 394 | var colorStr = colors[i % colors.length]; |
f474c2a3 | 395 | this.colors_.push(colorStr); |
6a1aa64f DV |
396 | } |
397 | } | |
285a6bda DV |
398 | |
399 | // TODO(danvk): update this w/r/t/ the new options system. | |
400 | this.renderOptions_.colorScheme = this.colors_; | |
fc80a396 DV |
401 | Dygraph.update(this.plotter_.options, this.renderOptions_); |
402 | Dygraph.update(this.layoutOptions_, this.user_attrs_); | |
403 | Dygraph.update(this.layoutOptions_, this.attrs_); | |
6a1aa64f DV |
404 | } |
405 | ||
3df0ccf0 DV |
406 | // The following functions are from quirksmode.org |
407 | // http://www.quirksmode.org/js/findpos.html | |
408 | Dygraph.findPosX = function(obj) { | |
409 | var curleft = 0; | |
410 | if (obj.offsetParent) { | |
411 | while (obj.offsetParent) { | |
412 | curleft += obj.offsetLeft; | |
413 | obj = obj.offsetParent; | |
414 | } | |
415 | } | |
416 | else if (obj.x) | |
417 | curleft += obj.x; | |
418 | return curleft; | |
419 | }; | |
420 | ||
421 | Dygraph.findPosY = function(obj) { | |
422 | var curtop = 0; | |
423 | if (obj.offsetParent) { | |
424 | while (obj.offsetParent) { | |
425 | curtop += obj.offsetTop; | |
426 | obj = obj.offsetParent; | |
427 | } | |
428 | } | |
429 | else if (obj.y) | |
430 | curtop += obj.y; | |
431 | return curtop; | |
432 | }; | |
433 | ||
6a1aa64f DV |
434 | /** |
435 | * Create the div that contains information on the selected point(s) | |
436 | * This goes in the top right of the canvas, unless an external div has already | |
437 | * been specified. | |
438 | * @private | |
439 | */ | |
285a6bda DV |
440 | Dygraph.prototype.createStatusMessage_ = function(){ |
441 | if (!this.attr_("labelsDiv")) { | |
442 | var divWidth = this.attr_('labelsDivWidth'); | |
b0c3b730 | 443 | var messagestyle = { |
6a1aa64f DV |
444 | "position": "absolute", |
445 | "fontSize": "14px", | |
446 | "zIndex": 10, | |
447 | "width": divWidth + "px", | |
448 | "top": "0px", | |
8846615a | 449 | "left": (this.width_ - divWidth - 2) + "px", |
6a1aa64f DV |
450 | "background": "white", |
451 | "textAlign": "left", | |
b0c3b730 | 452 | "overflow": "hidden"}; |
fc80a396 | 453 | Dygraph.update(messagestyle, this.attr_('labelsDivStyles')); |
b0c3b730 DV |
454 | var div = document.createElement("div"); |
455 | for (var name in messagestyle) { | |
85b99f0b DV |
456 | if (messagestyle.hasOwnProperty(name)) { |
457 | div.style[name] = messagestyle[name]; | |
458 | } | |
b0c3b730 DV |
459 | } |
460 | this.graphDiv.appendChild(div); | |
285a6bda | 461 | this.attrs_.labelsDiv = div; |
6a1aa64f DV |
462 | } |
463 | }; | |
464 | ||
465 | /** | |
466 | * Create the text box to adjust the averaging period | |
467 | * @return {Object} The newly-created text box | |
468 | * @private | |
469 | */ | |
285a6bda | 470 | Dygraph.prototype.createRollInterface_ = function() { |
285a6bda | 471 | var display = this.attr_('showRoller') ? "block" : "none"; |
b0c3b730 DV |
472 | var textAttr = { "position": "absolute", |
473 | "zIndex": 10, | |
474 | "top": (this.plotter_.area.h - 25) + "px", | |
475 | "left": (this.plotter_.area.x + 1) + "px", | |
476 | "display": display | |
6a1aa64f | 477 | }; |
b0c3b730 DV |
478 | var roller = document.createElement("input"); |
479 | roller.type = "text"; | |
480 | roller.size = "2"; | |
481 | roller.value = this.rollPeriod_; | |
482 | for (var name in textAttr) { | |
85b99f0b DV |
483 | if (textAttr.hasOwnProperty(name)) { |
484 | roller.style[name] = textAttr[name]; | |
485 | } | |
b0c3b730 DV |
486 | } |
487 | ||
6a1aa64f | 488 | var pa = this.graphDiv; |
b0c3b730 | 489 | pa.appendChild(roller); |
76171648 DV |
490 | var dygraph = this; |
491 | roller.onchange = function() { dygraph.adjustRoll(roller.value); }; | |
6a1aa64f | 492 | return roller; |
76171648 DV |
493 | }; |
494 | ||
495 | // These functions are taken from MochiKit.Signal | |
496 | Dygraph.pageX = function(e) { | |
497 | if (e.pageX) { | |
498 | return (!e.pageX || e.pageX < 0) ? 0 : e.pageX; | |
499 | } else { | |
500 | var de = document; | |
501 | var b = document.body; | |
502 | return e.clientX + | |
503 | (de.scrollLeft || b.scrollLeft) - | |
504 | (de.clientLeft || 0); | |
505 | } | |
506 | }; | |
507 | ||
508 | Dygraph.pageY = function(e) { | |
509 | if (e.pageY) { | |
510 | return (!e.pageY || e.pageY < 0) ? 0 : e.pageY; | |
511 | } else { | |
512 | var de = document; | |
513 | var b = document.body; | |
514 | return e.clientY + | |
515 | (de.scrollTop || b.scrollTop) - | |
516 | (de.clientTop || 0); | |
517 | } | |
518 | }; | |
6a1aa64f DV |
519 | |
520 | /** | |
521 | * Set up all the mouse handlers needed to capture dragging behavior for zoom | |
27385109 | 522 | * events. |
6a1aa64f DV |
523 | * @private |
524 | */ | |
285a6bda | 525 | Dygraph.prototype.createDragInterface_ = function() { |
6a1aa64f DV |
526 | var self = this; |
527 | ||
528 | // Tracks whether the mouse is down right now | |
bce01b0f | 529 | var isZooming = false; |
c776c216 | 530 | var isPanning = false; |
6a1aa64f DV |
531 | var dragStartX = null; |
532 | var dragStartY = null; | |
533 | var dragEndX = null; | |
534 | var dragEndY = null; | |
535 | var prevEndX = null; | |
bce01b0f DV |
536 | var draggingDate = null; |
537 | var dateRange = null; | |
6a1aa64f DV |
538 | |
539 | // Utility function to convert page-wide coordinates to canvas coords | |
67e650dc DV |
540 | var px = 0; |
541 | var py = 0; | |
76171648 DV |
542 | var getX = function(e) { return Dygraph.pageX(e) - px }; |
543 | var getY = function(e) { return Dygraph.pageX(e) - py }; | |
6a1aa64f DV |
544 | |
545 | // Draw zoom rectangles when the mouse is down and the user moves around | |
76171648 | 546 | Dygraph.addEvent(this.hidden_, 'mousemove', function(event) { |
bce01b0f | 547 | if (isZooming) { |
6a1aa64f DV |
548 | dragEndX = getX(event); |
549 | dragEndY = getY(event); | |
550 | ||
551 | self.drawZoomRect_(dragStartX, dragEndX, prevEndX); | |
552 | prevEndX = dragEndX; | |
bce01b0f DV |
553 | } else if (isPanning) { |
554 | dragEndX = getX(event); | |
555 | dragEndY = getY(event); | |
556 | ||
557 | // Want to have it so that: | |
558 | // 1. draggingDate appears at dragEndX | |
559 | // 2. daterange = (dateWindow_[1] - dateWindow_[0]) is unaltered. | |
560 | ||
561 | self.dateWindow_[0] = draggingDate - (dragEndX / self.width_) * dateRange; | |
562 | self.dateWindow_[1] = self.dateWindow_[0] + dateRange; | |
563 | self.drawGraph_(self.rawData_); | |
6a1aa64f DV |
564 | } |
565 | }); | |
566 | ||
567 | // Track the beginning of drag events | |
76171648 | 568 | Dygraph.addEvent(this.hidden_, 'mousedown', function(event) { |
3df0ccf0 DV |
569 | px = Dygraph.findPosX(self.canvas_); |
570 | py = Dygraph.findPosY(self.canvas_); | |
6a1aa64f DV |
571 | dragStartX = getX(event); |
572 | dragStartY = getY(event); | |
bce01b0f | 573 | |
2dab69c3 | 574 | if (event.altKey || event.shiftKey) { |
d12999d3 | 575 | if (!self.dateWindow_) return; // have to be zoomed in to pan. |
bce01b0f DV |
576 | isPanning = true; |
577 | dateRange = self.dateWindow_[1] - self.dateWindow_[0]; | |
d12999d3 DV |
578 | draggingDate = (dragStartX / self.width_) * dateRange + |
579 | self.dateWindow_[0]; | |
bce01b0f DV |
580 | } else { |
581 | isZooming = true; | |
582 | } | |
6a1aa64f DV |
583 | }); |
584 | ||
585 | // If the user releases the mouse button during a drag, but not over the | |
586 | // canvas, then it doesn't count as a zooming action. | |
76171648 | 587 | Dygraph.addEvent(document, 'mouseup', function(event) { |
bce01b0f DV |
588 | if (isZooming || isPanning) { |
589 | isZooming = false; | |
6a1aa64f DV |
590 | dragStartX = null; |
591 | dragStartY = null; | |
592 | } | |
bce01b0f DV |
593 | |
594 | if (isPanning) { | |
595 | isPanning = false; | |
596 | draggingDate = null; | |
597 | dateRange = null; | |
598 | } | |
6a1aa64f DV |
599 | }); |
600 | ||
601 | // Temporarily cancel the dragging event when the mouse leaves the graph | |
76171648 | 602 | Dygraph.addEvent(this.hidden_, 'mouseout', function(event) { |
bce01b0f | 603 | if (isZooming) { |
6a1aa64f DV |
604 | dragEndX = null; |
605 | dragEndY = null; | |
606 | } | |
607 | }); | |
608 | ||
609 | // If the mouse is released on the canvas during a drag event, then it's a | |
610 | // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels) | |
76171648 | 611 | Dygraph.addEvent(this.hidden_, 'mouseup', function(event) { |
bce01b0f DV |
612 | if (isZooming) { |
613 | isZooming = false; | |
6a1aa64f DV |
614 | dragEndX = getX(event); |
615 | dragEndY = getY(event); | |
616 | var regionWidth = Math.abs(dragEndX - dragStartX); | |
617 | var regionHeight = Math.abs(dragEndY - dragStartY); | |
618 | ||
619 | if (regionWidth < 2 && regionHeight < 2 && | |
285a6bda | 620 | self.attr_('clickCallback') != null && |
6a1aa64f | 621 | self.lastx_ != undefined) { |
b258a3da DV |
622 | // TODO(danvk): pass along more info about the points. |
623 | self.attr_('clickCallback')(event, self.lastx_, self.selPoints_); | |
6a1aa64f DV |
624 | } |
625 | ||
626 | if (regionWidth >= 10) { | |
627 | self.doZoom_(Math.min(dragStartX, dragEndX), | |
628 | Math.max(dragStartX, dragEndX)); | |
629 | } else { | |
630 | self.canvas_.getContext("2d").clearRect(0, 0, | |
631 | self.canvas_.width, | |
632 | self.canvas_.height); | |
633 | } | |
634 | ||
635 | dragStartX = null; | |
636 | dragStartY = null; | |
637 | } | |
bce01b0f DV |
638 | |
639 | if (isPanning) { | |
640 | isPanning = false; | |
641 | draggingDate = null; | |
642 | dateRange = null; | |
643 | } | |
6a1aa64f DV |
644 | }); |
645 | ||
646 | // Double-clicking zooms back out | |
76171648 | 647 | Dygraph.addEvent(this.hidden_, 'dblclick', function(event) { |
b258a3da | 648 | if (self.dateWindow_ == null) return; |
6a1aa64f DV |
649 | self.dateWindow_ = null; |
650 | self.drawGraph_(self.rawData_); | |
651 | var minDate = self.rawData_[0][0]; | |
652 | var maxDate = self.rawData_[self.rawData_.length - 1][0]; | |
285a6bda DV |
653 | if (self.attr_("zoomCallback")) { |
654 | self.attr_("zoomCallback")(minDate, maxDate); | |
67e650dc | 655 | } |
6a1aa64f DV |
656 | }); |
657 | }; | |
658 | ||
659 | /** | |
660 | * Draw a gray zoom rectangle over the desired area of the canvas. Also clears | |
661 | * up any previous zoom rectangles that were drawn. This could be optimized to | |
662 | * avoid extra redrawing, but it's tricky to avoid interactions with the status | |
663 | * dots. | |
664 | * @param {Number} startX The X position where the drag started, in canvas | |
665 | * coordinates. | |
666 | * @param {Number} endX The current X position of the drag, in canvas coords. | |
667 | * @param {Number} prevEndX The value of endX on the previous call to this | |
668 | * function. Used to avoid excess redrawing | |
669 | * @private | |
670 | */ | |
285a6bda | 671 | Dygraph.prototype.drawZoomRect_ = function(startX, endX, prevEndX) { |
6a1aa64f DV |
672 | var ctx = this.canvas_.getContext("2d"); |
673 | ||
674 | // Clean up from the previous rect if necessary | |
675 | if (prevEndX) { | |
676 | ctx.clearRect(Math.min(startX, prevEndX), 0, | |
677 | Math.abs(startX - prevEndX), this.height_); | |
678 | } | |
679 | ||
680 | // Draw a light-grey rectangle to show the new viewing area | |
681 | if (endX && startX) { | |
682 | ctx.fillStyle = "rgba(128,128,128,0.33)"; | |
683 | ctx.fillRect(Math.min(startX, endX), 0, | |
684 | Math.abs(endX - startX), this.height_); | |
685 | } | |
686 | }; | |
687 | ||
688 | /** | |
689 | * Zoom to something containing [lowX, highX]. These are pixel coordinates | |
690 | * in the canvas. The exact zoom window may be slightly larger if there are no | |
691 | * data points near lowX or highX. This function redraws the graph. | |
692 | * @param {Number} lowX The leftmost pixel value that should be visible. | |
693 | * @param {Number} highX The rightmost pixel value that should be visible. | |
694 | * @private | |
695 | */ | |
285a6bda | 696 | Dygraph.prototype.doZoom_ = function(lowX, highX) { |
6a1aa64f DV |
697 | // Find the earliest and latest dates contained in this canvasx range. |
698 | var points = this.layout_.points; | |
699 | var minDate = null; | |
700 | var maxDate = null; | |
701 | // Find the nearest [minDate, maxDate] that contains [lowX, highX] | |
702 | for (var i = 0; i < points.length; i++) { | |
703 | var cx = points[i].canvasx; | |
704 | var x = points[i].xval; | |
705 | if (cx < lowX && (minDate == null || x > minDate)) minDate = x; | |
706 | if (cx > highX && (maxDate == null || x < maxDate)) maxDate = x; | |
707 | } | |
708 | // Use the extremes if either is missing | |
709 | if (minDate == null) minDate = points[0].xval; | |
710 | if (maxDate == null) maxDate = points[points.length-1].xval; | |
711 | ||
712 | this.dateWindow_ = [minDate, maxDate]; | |
713 | this.drawGraph_(this.rawData_); | |
285a6bda DV |
714 | if (this.attr_("zoomCallback")) { |
715 | this.attr_("zoomCallback")(minDate, maxDate); | |
67e650dc | 716 | } |
6a1aa64f DV |
717 | }; |
718 | ||
719 | /** | |
720 | * When the mouse moves in the canvas, display information about a nearby data | |
721 | * point and draw dots over those points in the data series. This function | |
722 | * takes care of cleanup of previously-drawn dots. | |
723 | * @param {Object} event The mousemove event from the browser. | |
724 | * @private | |
725 | */ | |
285a6bda | 726 | Dygraph.prototype.mouseMove_ = function(event) { |
76171648 | 727 | var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(this.hidden_); |
6a1aa64f DV |
728 | var points = this.layout_.points; |
729 | ||
730 | var lastx = -1; | |
731 | var lasty = -1; | |
732 | ||
733 | // Loop through all the points and find the date nearest to our current | |
734 | // location. | |
735 | var minDist = 1e+100; | |
736 | var idx = -1; | |
737 | for (var i = 0; i < points.length; i++) { | |
738 | var dist = Math.abs(points[i].canvasx - canvasx); | |
739 | if (dist > minDist) break; | |
740 | minDist = dist; | |
741 | idx = i; | |
742 | } | |
743 | if (idx >= 0) lastx = points[idx].xval; | |
744 | // Check that you can really highlight the last day's data | |
745 | if (canvasx > points[points.length-1].canvasx) | |
746 | lastx = points[points.length-1].xval; | |
747 | ||
748 | // Extract the points we've selected | |
b258a3da | 749 | this.selPoints_ = []; |
6a1aa64f DV |
750 | for (var i = 0; i < points.length; i++) { |
751 | if (points[i].xval == lastx) { | |
b258a3da | 752 | this.selPoints_.push(points[i]); |
6a1aa64f DV |
753 | } |
754 | } | |
755 | ||
b258a3da DV |
756 | if (this.attr_("highlightCallback")) { |
757 | this.attr_("highlightCallback")(event, lastx, this.selPoints_); | |
758 | } | |
759 | ||
6a1aa64f | 760 | // Clear the previously drawn vertical, if there is one |
285a6bda | 761 | var circleSize = this.attr_('highlightCircleSize'); |
6a1aa64f DV |
762 | var ctx = this.canvas_.getContext("2d"); |
763 | if (this.previousVerticalX_ >= 0) { | |
764 | var px = this.previousVerticalX_; | |
765 | ctx.clearRect(px - circleSize - 1, 0, 2 * circleSize + 2, this.height_); | |
766 | } | |
767 | ||
584ceeaa DV |
768 | var isOK = function(x) { return x && !isNaN(x); }; |
769 | ||
b258a3da DV |
770 | if (this.selPoints_.length > 0) { |
771 | var canvasx = this.selPoints_[0].canvasx; | |
6a1aa64f DV |
772 | |
773 | // Set the status message to indicate the selected point(s) | |
285a6bda | 774 | var replace = this.attr_('xValueFormatter')(lastx, this) + ":"; |
6a1aa64f | 775 | var clen = this.colors_.length; |
b258a3da DV |
776 | for (var i = 0; i < this.selPoints_.length; i++) { |
777 | if (!isOK(this.selPoints_[i].canvasy)) continue; | |
285a6bda | 778 | if (this.attr_("labelsSeparateLines")) { |
6a1aa64f DV |
779 | replace += "<br/>"; |
780 | } | |
b258a3da | 781 | var point = this.selPoints_[i]; |
f474c2a3 DV |
782 | var c = new RGBColor(this.colors_[i%clen]); |
783 | replace += " <b><font color='" + c.toHex() + "'>" | |
6a1aa64f DV |
784 | + point.name + "</font></b>:" |
785 | + this.round_(point.yval, 2); | |
786 | } | |
285a6bda | 787 | this.attr_("labelsDiv").innerHTML = replace; |
6a1aa64f DV |
788 | |
789 | // Save last x position for callbacks. | |
790 | this.lastx_ = lastx; | |
791 | ||
792 | // Draw colored circles over the center of each selected point | |
793 | ctx.save() | |
b258a3da DV |
794 | for (var i = 0; i < this.selPoints_.length; i++) { |
795 | if (!isOK(this.selPoints_[i%clen].canvasy)) continue; | |
6a1aa64f | 796 | ctx.beginPath(); |
f474c2a3 | 797 | ctx.fillStyle = this.colors_[i%clen]; |
b258a3da | 798 | ctx.arc(canvasx, this.selPoints_[i%clen].canvasy, circleSize, |
7bf6a9fe | 799 | 0, 2 * Math.PI, false); |
6a1aa64f DV |
800 | ctx.fill(); |
801 | } | |
802 | ctx.restore(); | |
803 | ||
804 | this.previousVerticalX_ = canvasx; | |
805 | } | |
806 | }; | |
807 | ||
808 | /** | |
809 | * The mouse has left the canvas. Clear out whatever artifacts remain | |
810 | * @param {Object} event the mouseout event from the browser. | |
811 | * @private | |
812 | */ | |
285a6bda | 813 | Dygraph.prototype.mouseOut_ = function(event) { |
6a1aa64f DV |
814 | // Get rid of the overlay data |
815 | var ctx = this.canvas_.getContext("2d"); | |
816 | ctx.clearRect(0, 0, this.width_, this.height_); | |
285a6bda | 817 | this.attr_("labelsDiv").innerHTML = ""; |
6a1aa64f DV |
818 | }; |
819 | ||
285a6bda | 820 | Dygraph.zeropad = function(x) { |
32988383 DV |
821 | if (x < 10) return "0" + x; else return "" + x; |
822 | } | |
823 | ||
6a1aa64f | 824 | /** |
6b8e33dd DV |
825 | * Return a string version of the hours, minutes and seconds portion of a date. |
826 | * @param {Number} date The JavaScript date (ms since epoch) | |
827 | * @return {String} A time of the form "HH:MM:SS" | |
828 | * @private | |
829 | */ | |
285a6bda DV |
830 | Dygraph.prototype.hmsString_ = function(date) { |
831 | var zeropad = Dygraph.zeropad; | |
6b8e33dd DV |
832 | var d = new Date(date); |
833 | if (d.getSeconds()) { | |
834 | return zeropad(d.getHours()) + ":" + | |
835 | zeropad(d.getMinutes()) + ":" + | |
836 | zeropad(d.getSeconds()); | |
837 | } else if (d.getMinutes()) { | |
838 | return zeropad(d.getHours()) + ":" + zeropad(d.getMinutes()); | |
839 | } else { | |
840 | return zeropad(d.getHours()); | |
841 | } | |
842 | } | |
843 | ||
844 | /** | |
6a1aa64f DV |
845 | * Convert a JS date (millis since epoch) to YYYY/MM/DD |
846 | * @param {Number} date The JavaScript date (ms since epoch) | |
847 | * @return {String} A date of the form "YYYY/MM/DD" | |
848 | * @private | |
285a6bda | 849 | * TODO(danvk): why is this part of the prototype? |
6a1aa64f | 850 | */ |
285a6bda DV |
851 | Dygraph.dateString_ = function(date, self) { |
852 | var zeropad = Dygraph.zeropad; | |
6a1aa64f DV |
853 | var d = new Date(date); |
854 | ||
855 | // Get the year: | |
856 | var year = "" + d.getFullYear(); | |
857 | // Get a 0 padded month string | |
6b8e33dd | 858 | var month = zeropad(d.getMonth() + 1); //months are 0-offset, sigh |
6a1aa64f | 859 | // Get a 0 padded day string |
6b8e33dd | 860 | var day = zeropad(d.getDate()); |
6a1aa64f | 861 | |
6b8e33dd DV |
862 | var ret = ""; |
863 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); | |
285a6bda | 864 | if (frac) ret = " " + self.hmsString_(date); |
6b8e33dd DV |
865 | |
866 | return year + "/" + month + "/" + day + ret; | |
6a1aa64f DV |
867 | }; |
868 | ||
869 | /** | |
870 | * Round a number to the specified number of digits past the decimal point. | |
871 | * @param {Number} num The number to round | |
872 | * @param {Number} places The number of decimals to which to round | |
873 | * @return {Number} The rounded number | |
874 | * @private | |
875 | */ | |
285a6bda | 876 | Dygraph.prototype.round_ = function(num, places) { |
6a1aa64f DV |
877 | var shift = Math.pow(10, places); |
878 | return Math.round(num * shift)/shift; | |
879 | }; | |
880 | ||
881 | /** | |
882 | * Fires when there's data available to be graphed. | |
883 | * @param {String} data Raw CSV data to be plotted | |
884 | * @private | |
885 | */ | |
285a6bda | 886 | Dygraph.prototype.loadedEvent_ = function(data) { |
6a1aa64f DV |
887 | this.rawData_ = this.parseCSV_(data); |
888 | this.drawGraph_(this.rawData_); | |
889 | }; | |
890 | ||
285a6bda | 891 | Dygraph.prototype.months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", |
8846615a | 892 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; |
285a6bda | 893 | Dygraph.prototype.quarters = ["Jan", "Apr", "Jul", "Oct"]; |
6a1aa64f DV |
894 | |
895 | /** | |
896 | * Add ticks on the x-axis representing years, months, quarters, weeks, or days | |
897 | * @private | |
898 | */ | |
285a6bda | 899 | Dygraph.prototype.addXTicks_ = function() { |
6a1aa64f DV |
900 | // Determine the correct ticks scale on the x-axis: quarterly, monthly, ... |
901 | var startDate, endDate; | |
902 | if (this.dateWindow_) { | |
903 | startDate = this.dateWindow_[0]; | |
904 | endDate = this.dateWindow_[1]; | |
905 | } else { | |
906 | startDate = this.rawData_[0][0]; | |
907 | endDate = this.rawData_[this.rawData_.length - 1][0]; | |
908 | } | |
909 | ||
285a6bda | 910 | var xTicks = this.attr_('xTicker')(startDate, endDate, this); |
6a1aa64f | 911 | this.layout_.updateOptions({xTicks: xTicks}); |
32988383 DV |
912 | }; |
913 | ||
914 | // Time granularity enumeration | |
285a6bda | 915 | Dygraph.SECONDLY = 0; |
20a41c17 DV |
916 | Dygraph.TWO_SECONDLY = 1; |
917 | Dygraph.FIVE_SECONDLY = 2; | |
918 | Dygraph.TEN_SECONDLY = 3; | |
919 | Dygraph.THIRTY_SECONDLY = 4; | |
920 | Dygraph.MINUTELY = 5; | |
921 | Dygraph.TWO_MINUTELY = 6; | |
922 | Dygraph.FIVE_MINUTELY = 7; | |
923 | Dygraph.TEN_MINUTELY = 8; | |
924 | Dygraph.THIRTY_MINUTELY = 9; | |
925 | Dygraph.HOURLY = 10; | |
926 | Dygraph.TWO_HOURLY = 11; | |
927 | Dygraph.SIX_HOURLY = 12; | |
928 | Dygraph.DAILY = 13; | |
929 | Dygraph.WEEKLY = 14; | |
930 | Dygraph.MONTHLY = 15; | |
931 | Dygraph.QUARTERLY = 16; | |
932 | Dygraph.BIANNUAL = 17; | |
933 | Dygraph.ANNUAL = 18; | |
934 | Dygraph.DECADAL = 19; | |
935 | Dygraph.NUM_GRANULARITIES = 20; | |
285a6bda DV |
936 | |
937 | Dygraph.SHORT_SPACINGS = []; | |
938 | Dygraph.SHORT_SPACINGS[Dygraph.SECONDLY] = 1000 * 1; | |
20a41c17 DV |
939 | Dygraph.SHORT_SPACINGS[Dygraph.TWO_SECONDLY] = 1000 * 2; |
940 | Dygraph.SHORT_SPACINGS[Dygraph.FIVE_SECONDLY] = 1000 * 5; | |
285a6bda DV |
941 | Dygraph.SHORT_SPACINGS[Dygraph.TEN_SECONDLY] = 1000 * 10; |
942 | Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_SECONDLY] = 1000 * 30; | |
943 | Dygraph.SHORT_SPACINGS[Dygraph.MINUTELY] = 1000 * 60; | |
20a41c17 DV |
944 | Dygraph.SHORT_SPACINGS[Dygraph.TWO_MINUTELY] = 1000 * 60 * 2; |
945 | Dygraph.SHORT_SPACINGS[Dygraph.FIVE_MINUTELY] = 1000 * 60 * 5; | |
285a6bda DV |
946 | Dygraph.SHORT_SPACINGS[Dygraph.TEN_MINUTELY] = 1000 * 60 * 10; |
947 | Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_MINUTELY] = 1000 * 60 * 30; | |
948 | Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600; | |
20a41c17 | 949 | Dygraph.SHORT_SPACINGS[Dygraph.TWO_HOURLY] = 1000 * 3600 * 2; |
805d5519 | 950 | Dygraph.SHORT_SPACINGS[Dygraph.SIX_HOURLY] = 1000 * 3600 * 6; |
285a6bda DV |
951 | Dygraph.SHORT_SPACINGS[Dygraph.DAILY] = 1000 * 86400; |
952 | Dygraph.SHORT_SPACINGS[Dygraph.WEEKLY] = 1000 * 604800; | |
32988383 DV |
953 | |
954 | // NumXTicks() | |
955 | // | |
956 | // If we used this time granularity, how many ticks would there be? | |
957 | // This is only an approximation, but it's generally good enough. | |
958 | // | |
285a6bda DV |
959 | Dygraph.prototype.NumXTicks = function(start_time, end_time, granularity) { |
960 | if (granularity < Dygraph.MONTHLY) { | |
32988383 | 961 | // Generate one tick mark for every fixed interval of time. |
285a6bda | 962 | var spacing = Dygraph.SHORT_SPACINGS[granularity]; |
32988383 DV |
963 | return Math.floor(0.5 + 1.0 * (end_time - start_time) / spacing); |
964 | } else { | |
965 | var year_mod = 1; // e.g. to only print one point every 10 years. | |
966 | var num_months = 12; | |
285a6bda DV |
967 | if (granularity == Dygraph.QUARTERLY) num_months = 3; |
968 | if (granularity == Dygraph.BIANNUAL) num_months = 2; | |
969 | if (granularity == Dygraph.ANNUAL) num_months = 1; | |
970 | if (granularity == Dygraph.DECADAL) { num_months = 1; year_mod = 10; } | |
32988383 DV |
971 | |
972 | var msInYear = 365.2524 * 24 * 3600 * 1000; | |
973 | var num_years = 1.0 * (end_time - start_time) / msInYear; | |
974 | return Math.floor(0.5 + 1.0 * num_years * num_months / year_mod); | |
975 | } | |
976 | }; | |
977 | ||
978 | // GetXAxis() | |
979 | // | |
980 | // Construct an x-axis of nicely-formatted times on meaningful boundaries | |
981 | // (e.g. 'Jan 09' rather than 'Jan 22, 2009'). | |
982 | // | |
983 | // Returns an array containing {v: millis, label: label} dictionaries. | |
984 | // | |
285a6bda | 985 | Dygraph.prototype.GetXAxis = function(start_time, end_time, granularity) { |
32988383 | 986 | var ticks = []; |
285a6bda | 987 | if (granularity < Dygraph.MONTHLY) { |
32988383 | 988 | // Generate one tick mark for every fixed interval of time. |
285a6bda | 989 | var spacing = Dygraph.SHORT_SPACINGS[granularity]; |
3d29302c | 990 | var format = '%d%b'; // e.g. "1Jan" |
076c9622 DV |
991 | |
992 | // Find a time less than start_time which occurs on a "nice" time boundary | |
993 | // for this granularity. | |
994 | var g = spacing / 1000; | |
076c9622 DV |
995 | var d = new Date(start_time); |
996 | if (g <= 60) { // seconds | |
997 | var x = d.getSeconds(); d.setSeconds(x - x % g); | |
998 | } else { | |
999 | d.setSeconds(0); | |
1000 | g /= 60; | |
1001 | if (g <= 60) { // minutes | |
1002 | var x = d.getMinutes(); d.setMinutes(x - x % g); | |
1003 | } else { | |
1004 | d.setMinutes(0); | |
1005 | g /= 60; | |
1006 | ||
1007 | if (g <= 24) { // days | |
1008 | var x = d.getHours(); d.setHours(x - x % g); | |
1009 | } else { | |
1010 | d.setHours(0); | |
1011 | g /= 24; | |
1012 | ||
1013 | if (g == 7) { // one week | |
20a41c17 | 1014 | d.setDate(d.getDate() - d.getDay()); |
076c9622 DV |
1015 | } |
1016 | } | |
1017 | } | |
328bb812 | 1018 | } |
076c9622 DV |
1019 | start_time = d.getTime(); |
1020 | ||
32988383 DV |
1021 | for (var t = start_time; t <= end_time; t += spacing) { |
1022 | var d = new Date(t); | |
1023 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); | |
285a6bda | 1024 | if (frac == 0 || granularity >= Dygraph.DAILY) { |
32988383 DV |
1025 | // the extra hour covers DST problems. |
1026 | ticks.push({ v:t, label: new Date(t + 3600*1000).strftime(format) }); | |
1027 | } else { | |
1028 | ticks.push({ v:t, label: this.hmsString_(t) }); | |
1029 | } | |
1030 | } | |
1031 | } else { | |
1032 | // Display a tick mark on the first of a set of months of each year. | |
1033 | // Years get a tick mark iff y % year_mod == 0. This is useful for | |
1034 | // displaying a tick mark once every 10 years, say, on long time scales. | |
1035 | var months; | |
1036 | var year_mod = 1; // e.g. to only print one point every 10 years. | |
1037 | ||
285a6bda | 1038 | if (granularity == Dygraph.MONTHLY) { |
32988383 | 1039 | months = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ]; |
285a6bda | 1040 | } else if (granularity == Dygraph.QUARTERLY) { |
32988383 | 1041 | months = [ 0, 3, 6, 9 ]; |
285a6bda | 1042 | } else if (granularity == Dygraph.BIANNUAL) { |
32988383 | 1043 | months = [ 0, 6 ]; |
285a6bda | 1044 | } else if (granularity == Dygraph.ANNUAL) { |
32988383 | 1045 | months = [ 0 ]; |
285a6bda | 1046 | } else if (granularity == Dygraph.DECADAL) { |
32988383 DV |
1047 | months = [ 0 ]; |
1048 | year_mod = 10; | |
1049 | } | |
1050 | ||
1051 | var start_year = new Date(start_time).getFullYear(); | |
1052 | var end_year = new Date(end_time).getFullYear(); | |
285a6bda | 1053 | var zeropad = Dygraph.zeropad; |
32988383 DV |
1054 | for (var i = start_year; i <= end_year; i++) { |
1055 | if (i % year_mod != 0) continue; | |
1056 | for (var j = 0; j < months.length; j++) { | |
1057 | var date_str = i + "/" + zeropad(1 + months[j]) + "/01"; | |
1058 | var t = Date.parse(date_str); | |
1059 | if (t < start_time || t > end_time) continue; | |
1060 | ticks.push({ v:t, label: new Date(t).strftime('%b %y') }); | |
1061 | } | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | return ticks; | |
1066 | }; | |
1067 | ||
6a1aa64f DV |
1068 | |
1069 | /** | |
1070 | * Add ticks to the x-axis based on a date range. | |
1071 | * @param {Number} startDate Start of the date window (millis since epoch) | |
1072 | * @param {Number} endDate End of the date window (millis since epoch) | |
1073 | * @return {Array.<Object>} Array of {label, value} tuples. | |
1074 | * @public | |
1075 | */ | |
285a6bda | 1076 | Dygraph.dateTicker = function(startDate, endDate, self) { |
32988383 | 1077 | var chosen = -1; |
285a6bda DV |
1078 | for (var i = 0; i < Dygraph.NUM_GRANULARITIES; i++) { |
1079 | var num_ticks = self.NumXTicks(startDate, endDate, i); | |
1080 | if (self.width_ / num_ticks >= self.attr_('pixelsPerXLabel')) { | |
32988383 DV |
1081 | chosen = i; |
1082 | break; | |
2769de62 | 1083 | } |
6a1aa64f DV |
1084 | } |
1085 | ||
32988383 | 1086 | if (chosen >= 0) { |
285a6bda | 1087 | return self.GetXAxis(startDate, endDate, chosen); |
6a1aa64f | 1088 | } else { |
32988383 | 1089 | // TODO(danvk): signal error. |
6a1aa64f | 1090 | } |
6a1aa64f DV |
1091 | }; |
1092 | ||
1093 | /** | |
1094 | * Add ticks when the x axis has numbers on it (instead of dates) | |
1095 | * @param {Number} startDate Start of the date window (millis since epoch) | |
1096 | * @param {Number} endDate End of the date window (millis since epoch) | |
1097 | * @return {Array.<Object>} Array of {label, value} tuples. | |
1098 | * @public | |
1099 | */ | |
285a6bda | 1100 | Dygraph.numericTicks = function(minV, maxV, self) { |
c6336f04 DV |
1101 | // Basic idea: |
1102 | // Try labels every 1, 2, 5, 10, 20, 50, 100, etc. | |
1103 | // Calculate the resulting tick spacing (i.e. this.height_ / nTicks). | |
285a6bda | 1104 | // The first spacing greater than pixelsPerYLabel is what we use. |
f09e46d4 DV |
1105 | if (self.attr_("labelsKMG2")) { |
1106 | var mults = [1, 2, 4, 8]; | |
1107 | } else { | |
1108 | var mults = [1, 2, 5]; | |
1109 | } | |
c6336f04 | 1110 | var scale, low_val, high_val, nTicks; |
285a6bda DV |
1111 | // TODO(danvk): make it possible to set this for x- and y-axes independently. |
1112 | var pixelsPerTick = self.attr_('pixelsPerYLabel'); | |
c6336f04 | 1113 | for (var i = -10; i < 50; i++) { |
f09e46d4 DV |
1114 | if (self.attr_("labelsKMG2")) { |
1115 | var base_scale = Math.pow(16, i); | |
1116 | } else { | |
1117 | var base_scale = Math.pow(10, i); | |
1118 | } | |
c6336f04 DV |
1119 | for (var j = 0; j < mults.length; j++) { |
1120 | scale = base_scale * mults[j]; | |
c6336f04 DV |
1121 | low_val = Math.floor(minV / scale) * scale; |
1122 | high_val = Math.ceil(maxV / scale) * scale; | |
1123 | nTicks = (high_val - low_val) / scale; | |
285a6bda | 1124 | var spacing = self.height_ / nTicks; |
c6336f04 | 1125 | // wish I could break out of both loops at once... |
285a6bda | 1126 | if (spacing > pixelsPerTick) break; |
c6336f04 | 1127 | } |
285a6bda | 1128 | if (spacing > pixelsPerTick) break; |
6a1aa64f DV |
1129 | } |
1130 | ||
1131 | // Construct labels for the ticks | |
1132 | var ticks = []; | |
ed11be50 DV |
1133 | var k; |
1134 | var k_labels = []; | |
1135 | if (self.attr_("labelsKMB")) { | |
1136 | k = 1000; | |
1137 | k_labels = [ "K", "M", "B", "T" ]; | |
1138 | } | |
1139 | if (self.attr_("labelsKMG2")) { | |
1140 | if (k) self.warn("Setting both labelsKMB and labelsKMG2. Pick one!"); | |
1141 | k = 1024; | |
1142 | k_labels = [ "k", "M", "G", "T" ]; | |
1143 | } | |
1144 | ||
c6336f04 DV |
1145 | for (var i = 0; i < nTicks; i++) { |
1146 | var tickV = low_val + i * scale; | |
0af6e346 | 1147 | var absTickV = Math.abs(tickV); |
285a6bda | 1148 | var label = self.round_(tickV, 2); |
ed11be50 DV |
1149 | if (k_labels.length) { |
1150 | // Round up to an appropriate unit. | |
1151 | var n = k*k*k*k; | |
1152 | for (var j = 3; j >= 0; j--, n /= k) { | |
1153 | if (absTickV >= n) { | |
1154 | label = self.round_(tickV / n, 1) + k_labels[j]; | |
1155 | break; | |
1156 | } | |
afefbcdb | 1157 | } |
6a1aa64f DV |
1158 | } |
1159 | ticks.push( {label: label, v: tickV} ); | |
1160 | } | |
1161 | return ticks; | |
1162 | }; | |
1163 | ||
1164 | /** | |
1165 | * Adds appropriate ticks on the y-axis | |
1166 | * @param {Number} minY The minimum Y value in the data set | |
1167 | * @param {Number} maxY The maximum Y value in the data set | |
1168 | * @private | |
1169 | */ | |
285a6bda | 1170 | Dygraph.prototype.addYTicks_ = function(minY, maxY) { |
6a1aa64f | 1171 | // Set the number of ticks so that the labels are human-friendly. |
285a6bda DV |
1172 | // TODO(danvk): make this an attribute as well. |
1173 | var ticks = Dygraph.numericTicks(minY, maxY, this); | |
6a1aa64f DV |
1174 | this.layout_.updateOptions( { yAxis: [minY, maxY], |
1175 | yTicks: ticks } ); | |
1176 | }; | |
1177 | ||
5011e7a1 DV |
1178 | // Computes the range of the data series (including confidence intervals). |
1179 | // series is either [ [x1, y1], [x2, y2], ... ] or | |
1180 | // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ... | |
1181 | // Returns [low, high] | |
1182 | Dygraph.prototype.extremeValues_ = function(series) { | |
1183 | var minY = null, maxY = null; | |
1184 | ||
9922b78b | 1185 | var bars = this.attr_("errorBars") || this.attr_("customBars"); |
5011e7a1 DV |
1186 | if (bars) { |
1187 | // With custom bars, maxY is the max of the high values. | |
1188 | for (var j = 0; j < series.length; j++) { | |
1189 | var y = series[j][1][0]; | |
1190 | if (!y) continue; | |
1191 | var low = y - series[j][1][1]; | |
1192 | var high = y + series[j][1][2]; | |
1193 | if (low > y) low = y; // this can happen with custom bars, | |
1194 | if (high < y) high = y; // e.g. in tests/custom-bars.html | |
1195 | if (maxY == null || high > maxY) { | |
1196 | maxY = high; | |
1197 | } | |
1198 | if (minY == null || low < minY) { | |
1199 | minY = low; | |
1200 | } | |
1201 | } | |
1202 | } else { | |
1203 | for (var j = 0; j < series.length; j++) { | |
1204 | var y = series[j][1]; | |
d12999d3 | 1205 | if (y === null || isNaN(y)) continue; |
5011e7a1 DV |
1206 | if (maxY == null || y > maxY) { |
1207 | maxY = y; | |
1208 | } | |
1209 | if (minY == null || y < minY) { | |
1210 | minY = y; | |
1211 | } | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | return [minY, maxY]; | |
1216 | }; | |
1217 | ||
6a1aa64f DV |
1218 | /** |
1219 | * Update the graph with new data. Data is in the format | |
1220 | * [ [date1, val1, val2, ...], [date2, val1, val2, ...] if errorBars=false | |
1221 | * or, if errorBars=true, | |
1222 | * [ [date1, [val1,stddev1], [val2,stddev2], ...], [date2, ...], ...] | |
1223 | * @param {Array.<Object>} data The data (see above) | |
1224 | * @private | |
1225 | */ | |
285a6bda | 1226 | Dygraph.prototype.drawGraph_ = function(data) { |
3bd9c228 | 1227 | var minY = null, maxY = null; |
6a1aa64f | 1228 | this.layout_.removeAllDatasets(); |
285a6bda | 1229 | this.setColors_(); |
9317362d | 1230 | this.attrs_['pointSize'] = 0.5 * this.attr_('highlightCircleSize'); |
285a6bda | 1231 | |
6a1aa64f DV |
1232 | // Loop over all fields in the dataset |
1233 | for (var i = 1; i < data[0].length; i++) { | |
1cf11047 DV |
1234 | if (!this.visibility()[i - 1]) continue; |
1235 | ||
6a1aa64f DV |
1236 | var series = []; |
1237 | for (var j = 0; j < data.length; j++) { | |
1238 | var date = data[j][0]; | |
1239 | series[j] = [date, data[j][i]]; | |
1240 | } | |
1241 | series = this.rollingAverage(series, this.rollPeriod_); | |
1242 | ||
1243 | // Prune down to the desired range, if necessary (for zooming) | |
9922b78b | 1244 | var bars = this.attr_("errorBars") || this.attr_("customBars"); |
6a1aa64f DV |
1245 | if (this.dateWindow_) { |
1246 | var low = this.dateWindow_[0]; | |
1247 | var high= this.dateWindow_[1]; | |
1248 | var pruned = []; | |
1249 | for (var k = 0; k < series.length; k++) { | |
1250 | if (series[k][0] >= low && series[k][0] <= high) { | |
1251 | pruned.push(series[k]); | |
6a1aa64f DV |
1252 | } |
1253 | } | |
1254 | series = pruned; | |
6a1aa64f DV |
1255 | } |
1256 | ||
648acd28 DV |
1257 | var extremes = this.extremeValues_(series); |
1258 | var thisMinY = extremes[0]; | |
1259 | var thisMaxY = extremes[1]; | |
5011e7a1 DV |
1260 | if (!minY || thisMinY < minY) minY = thisMinY; |
1261 | if (!maxY || thisMaxY > maxY) maxY = thisMaxY; | |
1262 | ||
6a1aa64f DV |
1263 | if (bars) { |
1264 | var vals = []; | |
1265 | for (var j=0; j<series.length; j++) | |
1266 | vals[j] = [series[j][0], | |
1267 | series[j][1][0], series[j][1][1], series[j][1][2]]; | |
285a6bda | 1268 | this.layout_.addDataset(this.attr_("labels")[i], vals); |
6a1aa64f | 1269 | } else { |
285a6bda | 1270 | this.layout_.addDataset(this.attr_("labels")[i], series); |
6a1aa64f DV |
1271 | } |
1272 | } | |
1273 | ||
1274 | // Use some heuristics to come up with a good maxY value, unless it's been | |
1275 | // set explicitly by the user. | |
1276 | if (this.valueRange_ != null) { | |
1277 | this.addYTicks_(this.valueRange_[0], this.valueRange_[1]); | |
1278 | } else { | |
1279 | // Add some padding and round up to an integer to be human-friendly. | |
3bd9c228 DV |
1280 | var span = maxY - minY; |
1281 | var maxAxisY = maxY + 0.1 * span; | |
1282 | var minAxisY = minY - 0.1 * span; | |
1283 | ||
1284 | // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense. | |
ceb009dd DV |
1285 | if (minAxisY < 0 && minY >= 0) minAxisY = 0; |
1286 | if (maxAxisY > 0 && maxY <= 0) maxAxisY = 0; | |
3bd9c228 DV |
1287 | |
1288 | if (this.attr_("includeZero")) { | |
1289 | if (maxY < 0) maxAxisY = 0; | |
1290 | if (minY > 0) minAxisY = 0; | |
1291 | } | |
1292 | ||
1293 | this.addYTicks_(minAxisY, maxAxisY); | |
6a1aa64f DV |
1294 | } |
1295 | ||
1296 | this.addXTicks_(); | |
1297 | ||
1298 | // Tell PlotKit to use this new data and render itself | |
d033ae1c | 1299 | this.layout_.updateOptions({dateWindow: this.dateWindow_}); |
6a1aa64f DV |
1300 | this.layout_.evaluateWithError(); |
1301 | this.plotter_.clear(); | |
1302 | this.plotter_.render(); | |
f6401bf6 DV |
1303 | this.canvas_.getContext('2d').clearRect(0, 0, this.canvas_.width, |
1304 | this.canvas_.height); | |
6a1aa64f DV |
1305 | }; |
1306 | ||
1307 | /** | |
1308 | * Calculates the rolling average of a data set. | |
1309 | * If originalData is [label, val], rolls the average of those. | |
1310 | * If originalData is [label, [, it's interpreted as [value, stddev] | |
1311 | * and the roll is returned in the same form, with appropriately reduced | |
1312 | * stddev for each value. | |
1313 | * Note that this is where fractional input (i.e. '5/10') is converted into | |
1314 | * decimal values. | |
1315 | * @param {Array} originalData The data in the appropriate format (see above) | |
1316 | * @param {Number} rollPeriod The number of days over which to average the data | |
1317 | */ | |
285a6bda | 1318 | Dygraph.prototype.rollingAverage = function(originalData, rollPeriod) { |
6a1aa64f DV |
1319 | if (originalData.length < 2) |
1320 | return originalData; | |
1321 | var rollPeriod = Math.min(rollPeriod, originalData.length - 1); | |
1322 | var rollingData = []; | |
285a6bda | 1323 | var sigma = this.attr_("sigma"); |
6a1aa64f DV |
1324 | |
1325 | if (this.fractions_) { | |
1326 | var num = 0; | |
1327 | var den = 0; // numerator/denominator | |
1328 | var mult = 100.0; | |
1329 | for (var i = 0; i < originalData.length; i++) { | |
1330 | num += originalData[i][1][0]; | |
1331 | den += originalData[i][1][1]; | |
1332 | if (i - rollPeriod >= 0) { | |
1333 | num -= originalData[i - rollPeriod][1][0]; | |
1334 | den -= originalData[i - rollPeriod][1][1]; | |
1335 | } | |
1336 | ||
1337 | var date = originalData[i][0]; | |
1338 | var value = den ? num / den : 0.0; | |
285a6bda | 1339 | if (this.attr_("errorBars")) { |
6a1aa64f DV |
1340 | if (this.wilsonInterval_) { |
1341 | // For more details on this confidence interval, see: | |
1342 | // http://en.wikipedia.org/wiki/Binomial_confidence_interval | |
1343 | if (den) { | |
1344 | var p = value < 0 ? 0 : value, n = den; | |
1345 | var pm = sigma * Math.sqrt(p*(1-p)/n + sigma*sigma/(4*n*n)); | |
1346 | var denom = 1 + sigma * sigma / den; | |
1347 | var low = (p + sigma * sigma / (2 * den) - pm) / denom; | |
1348 | var high = (p + sigma * sigma / (2 * den) + pm) / denom; | |
1349 | rollingData[i] = [date, | |
1350 | [p * mult, (p - low) * mult, (high - p) * mult]]; | |
1351 | } else { | |
1352 | rollingData[i] = [date, [0, 0, 0]]; | |
1353 | } | |
1354 | } else { | |
1355 | var stddev = den ? sigma * Math.sqrt(value * (1 - value) / den) : 1.0; | |
1356 | rollingData[i] = [date, [mult * value, mult * stddev, mult * stddev]]; | |
1357 | } | |
1358 | } else { | |
1359 | rollingData[i] = [date, mult * value]; | |
1360 | } | |
1361 | } | |
9922b78b | 1362 | } else if (this.attr_("customBars")) { |
f6885d6a DV |
1363 | var low = 0; |
1364 | var mid = 0; | |
1365 | var high = 0; | |
1366 | var count = 0; | |
6a1aa64f DV |
1367 | for (var i = 0; i < originalData.length; i++) { |
1368 | var data = originalData[i][1]; | |
1369 | var y = data[1]; | |
1370 | rollingData[i] = [originalData[i][0], [y, y - data[0], data[2] - y]]; | |
f6885d6a | 1371 | |
8b91c51f | 1372 | if (y != null && !isNaN(y)) { |
49a7d0d5 DV |
1373 | low += data[0]; |
1374 | mid += y; | |
1375 | high += data[2]; | |
1376 | count += 1; | |
1377 | } | |
f6885d6a DV |
1378 | if (i - rollPeriod >= 0) { |
1379 | var prev = originalData[i - rollPeriod]; | |
8b91c51f | 1380 | if (prev[1][1] != null && !isNaN(prev[1][1])) { |
49a7d0d5 DV |
1381 | low -= prev[1][0]; |
1382 | mid -= prev[1][1]; | |
1383 | high -= prev[1][2]; | |
1384 | count -= 1; | |
1385 | } | |
f6885d6a DV |
1386 | } |
1387 | rollingData[i] = [originalData[i][0], [ 1.0 * mid / count, | |
1388 | 1.0 * (mid - low) / count, | |
1389 | 1.0 * (high - mid) / count ]]; | |
2769de62 | 1390 | } |
6a1aa64f DV |
1391 | } else { |
1392 | // Calculate the rolling average for the first rollPeriod - 1 points where | |
1393 | // there is not enough data to roll over the full number of days | |
1394 | var num_init_points = Math.min(rollPeriod - 1, originalData.length - 2); | |
285a6bda | 1395 | if (!this.attr_("errorBars")){ |
5011e7a1 DV |
1396 | if (rollPeriod == 1) { |
1397 | return originalData; | |
1398 | } | |
1399 | ||
2847c1cf | 1400 | for (var i = 0; i < originalData.length; i++) { |
6a1aa64f | 1401 | var sum = 0; |
5011e7a1 | 1402 | var num_ok = 0; |
2847c1cf DV |
1403 | for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) { |
1404 | var y = originalData[j][1]; | |
8b91c51f | 1405 | if (y == null || isNaN(y)) continue; |
5011e7a1 | 1406 | num_ok++; |
2847c1cf | 1407 | sum += originalData[j][1]; |
6a1aa64f | 1408 | } |
5011e7a1 | 1409 | if (num_ok) { |
2847c1cf | 1410 | rollingData[i] = [originalData[i][0], sum / num_ok]; |
5011e7a1 | 1411 | } else { |
2847c1cf | 1412 | rollingData[i] = [originalData[i][0], null]; |
5011e7a1 | 1413 | } |
6a1aa64f | 1414 | } |
2847c1cf DV |
1415 | |
1416 | } else { | |
1417 | for (var i = 0; i < originalData.length; i++) { | |
6a1aa64f DV |
1418 | var sum = 0; |
1419 | var variance = 0; | |
5011e7a1 | 1420 | var num_ok = 0; |
2847c1cf | 1421 | for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) { |
5011e7a1 | 1422 | var y = originalData[j][1][0]; |
8b91c51f | 1423 | if (y == null || isNaN(y)) continue; |
5011e7a1 | 1424 | num_ok++; |
6a1aa64f DV |
1425 | sum += originalData[j][1][0]; |
1426 | variance += Math.pow(originalData[j][1][1], 2); | |
1427 | } | |
5011e7a1 DV |
1428 | if (num_ok) { |
1429 | var stddev = Math.sqrt(variance) / num_ok; | |
1430 | rollingData[i] = [originalData[i][0], | |
1431 | [sum / num_ok, sigma * stddev, sigma * stddev]]; | |
1432 | } else { | |
1433 | rollingData[i] = [originalData[i][0], [null, null, null]]; | |
1434 | } | |
6a1aa64f DV |
1435 | } |
1436 | } | |
1437 | } | |
1438 | ||
1439 | return rollingData; | |
1440 | }; | |
1441 | ||
1442 | /** | |
1443 | * Parses a date, returning the number of milliseconds since epoch. This can be | |
285a6bda DV |
1444 | * passed in as an xValueParser in the Dygraph constructor. |
1445 | * TODO(danvk): enumerate formats that this understands. | |
6a1aa64f DV |
1446 | * @param {String} A date in YYYYMMDD format. |
1447 | * @return {Number} Milliseconds since epoch. | |
1448 | * @public | |
1449 | */ | |
285a6bda | 1450 | Dygraph.dateParser = function(dateStr, self) { |
6a1aa64f | 1451 | var dateStrSlashed; |
285a6bda | 1452 | var d; |
2769de62 | 1453 | if (dateStr.length == 10 && dateStr.search("-") != -1) { // e.g. '2009-07-12' |
6a1aa64f | 1454 | dateStrSlashed = dateStr.replace("-", "/", "g"); |
353a0294 DV |
1455 | while (dateStrSlashed.search("-") != -1) { |
1456 | dateStrSlashed = dateStrSlashed.replace("-", "/"); | |
1457 | } | |
285a6bda | 1458 | d = Date.parse(dateStrSlashed); |
2769de62 | 1459 | } else if (dateStr.length == 8) { // e.g. '20090712' |
285a6bda | 1460 | // TODO(danvk): remove support for this format. It's confusing. |
6a1aa64f DV |
1461 | dateStrSlashed = dateStr.substr(0,4) + "/" + dateStr.substr(4,2) |
1462 | + "/" + dateStr.substr(6,2); | |
285a6bda | 1463 | d = Date.parse(dateStrSlashed); |
2769de62 DV |
1464 | } else { |
1465 | // Any format that Date.parse will accept, e.g. "2009/07/12" or | |
1466 | // "2009/07/12 12:34:56" | |
285a6bda DV |
1467 | d = Date.parse(dateStr); |
1468 | } | |
1469 | ||
1470 | if (!d || isNaN(d)) { | |
1471 | self.error("Couldn't parse " + dateStr + " as a date"); | |
1472 | } | |
1473 | return d; | |
1474 | }; | |
1475 | ||
1476 | /** | |
1477 | * Detects the type of the str (date or numeric) and sets the various | |
1478 | * formatting attributes in this.attrs_ based on this type. | |
1479 | * @param {String} str An x value. | |
1480 | * @private | |
1481 | */ | |
1482 | Dygraph.prototype.detectTypeFromString_ = function(str) { | |
1483 | var isDate = false; | |
1484 | if (str.indexOf('-') >= 0 || | |
1485 | str.indexOf('/') >= 0 || | |
1486 | isNaN(parseFloat(str))) { | |
1487 | isDate = true; | |
1488 | } else if (str.length == 8 && str > '19700101' && str < '20371231') { | |
1489 | // TODO(danvk): remove support for this format. | |
1490 | isDate = true; | |
1491 | } | |
1492 | ||
1493 | if (isDate) { | |
1494 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1495 | this.attrs_.xValueParser = Dygraph.dateParser; | |
1496 | this.attrs_.xTicker = Dygraph.dateTicker; | |
1497 | } else { | |
1498 | this.attrs_.xValueFormatter = function(x) { return x; }; | |
1499 | this.attrs_.xValueParser = function(x) { return parseFloat(x); }; | |
1500 | this.attrs_.xTicker = Dygraph.numericTicks; | |
6a1aa64f | 1501 | } |
6a1aa64f DV |
1502 | }; |
1503 | ||
1504 | /** | |
1505 | * Parses a string in a special csv format. We expect a csv file where each | |
1506 | * line is a date point, and the first field in each line is the date string. | |
1507 | * We also expect that all remaining fields represent series. | |
285a6bda | 1508 | * if the errorBars attribute is set, then interpret the fields as: |
6a1aa64f DV |
1509 | * date, series1, stddev1, series2, stddev2, ... |
1510 | * @param {Array.<Object>} data See above. | |
1511 | * @private | |
285a6bda DV |
1512 | * |
1513 | * @return Array.<Object> An array with one entry for each row. These entries | |
1514 | * are an array of cells in that row. The first entry is the parsed x-value for | |
1515 | * the row. The second, third, etc. are the y-values. These can take on one of | |
1516 | * three forms, depending on the CSV and constructor parameters: | |
1517 | * 1. numeric value | |
1518 | * 2. [ value, stddev ] | |
1519 | * 3. [ low value, center value, high value ] | |
6a1aa64f | 1520 | */ |
285a6bda | 1521 | Dygraph.prototype.parseCSV_ = function(data) { |
6a1aa64f DV |
1522 | var ret = []; |
1523 | var lines = data.split("\n"); | |
3d67f03b DV |
1524 | |
1525 | // Use the default delimiter or fall back to a tab if that makes sense. | |
1526 | var delim = this.attr_('delimiter'); | |
1527 | if (lines[0].indexOf(delim) == -1 && lines[0].indexOf('\t') >= 0) { | |
1528 | delim = '\t'; | |
1529 | } | |
1530 | ||
285a6bda | 1531 | var start = 0; |
6a1aa64f | 1532 | if (this.labelsFromCSV_) { |
285a6bda | 1533 | start = 1; |
3d67f03b | 1534 | this.attrs_.labels = lines[0].split(delim); |
6a1aa64f DV |
1535 | } |
1536 | ||
285a6bda DV |
1537 | var xParser; |
1538 | var defaultParserSet = false; // attempt to auto-detect x value type | |
1539 | var expectedCols = this.attr_("labels").length; | |
6a1aa64f DV |
1540 | for (var i = start; i < lines.length; i++) { |
1541 | var line = lines[i]; | |
1542 | if (line.length == 0) continue; // skip blank lines | |
3d67f03b DV |
1543 | if (line[0] == '#') continue; // skip comment lines |
1544 | var inFields = line.split(delim); | |
285a6bda | 1545 | if (inFields.length < 2) continue; |
6a1aa64f DV |
1546 | |
1547 | var fields = []; | |
285a6bda DV |
1548 | if (!defaultParserSet) { |
1549 | this.detectTypeFromString_(inFields[0]); | |
1550 | xParser = this.attr_("xValueParser"); | |
1551 | defaultParserSet = true; | |
1552 | } | |
1553 | fields[0] = xParser(inFields[0], this); | |
6a1aa64f DV |
1554 | |
1555 | // If fractions are expected, parse the numbers as "A/B" | |
1556 | if (this.fractions_) { | |
1557 | for (var j = 1; j < inFields.length; j++) { | |
1558 | // TODO(danvk): figure out an appropriate way to flag parse errors. | |
1559 | var vals = inFields[j].split("/"); | |
1560 | fields[j] = [parseFloat(vals[0]), parseFloat(vals[1])]; | |
1561 | } | |
285a6bda | 1562 | } else if (this.attr_("errorBars")) { |
6a1aa64f DV |
1563 | // If there are error bars, values are (value, stddev) pairs |
1564 | for (var j = 1; j < inFields.length; j += 2) | |
1565 | fields[(j + 1) / 2] = [parseFloat(inFields[j]), | |
1566 | parseFloat(inFields[j + 1])]; | |
9922b78b | 1567 | } else if (this.attr_("customBars")) { |
6a1aa64f DV |
1568 | // Bars are a low;center;high tuple |
1569 | for (var j = 1; j < inFields.length; j++) { | |
1570 | var vals = inFields[j].split(";"); | |
1571 | fields[j] = [ parseFloat(vals[0]), | |
1572 | parseFloat(vals[1]), | |
1573 | parseFloat(vals[2]) ]; | |
1574 | } | |
1575 | } else { | |
1576 | // Values are just numbers | |
285a6bda | 1577 | for (var j = 1; j < inFields.length; j++) { |
6a1aa64f | 1578 | fields[j] = parseFloat(inFields[j]); |
285a6bda | 1579 | } |
6a1aa64f DV |
1580 | } |
1581 | ret.push(fields); | |
285a6bda DV |
1582 | |
1583 | if (fields.length != expectedCols) { | |
1584 | this.error("Number of columns in line " + i + " (" + fields.length + | |
1585 | ") does not agree with number of labels (" + expectedCols + | |
1586 | ") " + line); | |
1587 | } | |
6a1aa64f DV |
1588 | } |
1589 | return ret; | |
1590 | }; | |
1591 | ||
1592 | /** | |
285a6bda DV |
1593 | * The user has provided their data as a pre-packaged JS array. If the x values |
1594 | * are numeric, this is the same as dygraphs' internal format. If the x values | |
1595 | * are dates, we need to convert them from Date objects to ms since epoch. | |
1596 | * @param {Array.<Object>} data | |
1597 | * @return {Array.<Object>} data with numeric x values. | |
1598 | */ | |
1599 | Dygraph.prototype.parseArray_ = function(data) { | |
1600 | // Peek at the first x value to see if it's numeric. | |
1601 | if (data.length == 0) { | |
1602 | this.error("Can't plot empty data set"); | |
1603 | return null; | |
1604 | } | |
1605 | if (data[0].length == 0) { | |
1606 | this.error("Data set cannot contain an empty row"); | |
1607 | return null; | |
1608 | } | |
1609 | ||
1610 | if (this.attr_("labels") == null) { | |
1611 | this.warn("Using default labels. Set labels explicitly via 'labels' " + | |
1612 | "in the options parameter"); | |
1613 | this.attrs_.labels = [ "X" ]; | |
1614 | for (var i = 1; i < data[0].length; i++) { | |
1615 | this.attrs_.labels.push("Y" + i); | |
1616 | } | |
1617 | } | |
1618 | ||
2dda3850 | 1619 | if (Dygraph.isDateLike(data[0][0])) { |
285a6bda DV |
1620 | // Some intelligent defaults for a date x-axis. |
1621 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1622 | this.attrs_.xTicker = Dygraph.dateTicker; | |
1623 | ||
1624 | // Assume they're all dates. | |
e3ab7b40 | 1625 | var parsedData = Dygraph.clone(data); |
285a6bda DV |
1626 | for (var i = 0; i < data.length; i++) { |
1627 | if (parsedData[i].length == 0) { | |
1628 | this.error("Row " << (1 + i) << " of data is empty"); | |
1629 | return null; | |
1630 | } | |
1631 | if (parsedData[i][0] == null | |
1632 | || typeof(parsedData[i][0].getTime) != 'function') { | |
1633 | this.error("x value in row " << (1 + i) << " is not a Date"); | |
1634 | return null; | |
1635 | } | |
1636 | parsedData[i][0] = parsedData[i][0].getTime(); | |
1637 | } | |
1638 | return parsedData; | |
1639 | } else { | |
1640 | // Some intelligent defaults for a numeric x-axis. | |
1641 | this.attrs_.xValueFormatter = function(x) { return x; }; | |
1642 | this.attrs_.xTicker = Dygraph.numericTicks; | |
1643 | return data; | |
1644 | } | |
1645 | }; | |
1646 | ||
1647 | /** | |
79420a1e DV |
1648 | * Parses a DataTable object from gviz. |
1649 | * The data is expected to have a first column that is either a date or a | |
1650 | * number. All subsequent columns must be numbers. If there is a clear mismatch | |
1651 | * between this.xValueParser_ and the type of the first column, it will be | |
1652 | * fixed. Returned value is in the same format as return value of parseCSV_. | |
1653 | * @param {Array.<Object>} data See above. | |
1654 | * @private | |
1655 | */ | |
285a6bda | 1656 | Dygraph.prototype.parseDataTable_ = function(data) { |
79420a1e DV |
1657 | var cols = data.getNumberOfColumns(); |
1658 | var rows = data.getNumberOfRows(); | |
1659 | ||
1660 | // Read column labels | |
1661 | var labels = []; | |
1662 | for (var i = 0; i < cols; i++) { | |
1663 | labels.push(data.getColumnLabel(i)); | |
3e3f84e4 | 1664 | if (i != 0 && this.attr_("errorBars")) i += 1; |
79420a1e | 1665 | } |
285a6bda | 1666 | this.attrs_.labels = labels; |
3e3f84e4 | 1667 | cols = labels.length; |
79420a1e | 1668 | |
d955e223 | 1669 | var indepType = data.getColumnType(0); |
285a6bda DV |
1670 | if (indepType == 'date') { |
1671 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1672 | this.attrs_.xValueParser = Dygraph.dateParser; | |
1673 | this.attrs_.xTicker = Dygraph.dateTicker; | |
33127159 | 1674 | } else if (indepType == 'number') { |
285a6bda DV |
1675 | this.attrs_.xValueFormatter = function(x) { return x; }; |
1676 | this.attrs_.xValueParser = function(x) { return parseFloat(x); }; | |
1677 | this.attrs_.xTicker = Dygraph.numericTicks; | |
1678 | } else { | |
33127159 | 1679 | this.error("only 'date' and 'number' types are supported for column 1 " + |
285a6bda | 1680 | "of DataTable input (Got '" + indepType + "')"); |
79420a1e DV |
1681 | return null; |
1682 | } | |
1683 | ||
1684 | var ret = []; | |
1685 | for (var i = 0; i < rows; i++) { | |
1686 | var row = []; | |
debe4434 DV |
1687 | if (typeof(data.getValue(i, 0)) === 'undefined' || |
1688 | data.getValue(i, 0) === null) { | |
1689 | this.warning("Ignoring row " + i + | |
1690 | " of DataTable because of undefined or null first column."); | |
1691 | continue; | |
1692 | } | |
1693 | ||
d955e223 DV |
1694 | if (indepType == 'date') { |
1695 | row.push(data.getValue(i, 0).getTime()); | |
1696 | } else { | |
1697 | row.push(data.getValue(i, 0)); | |
1698 | } | |
3e3f84e4 DV |
1699 | if (!this.attr_("errorBars")) { |
1700 | for (var j = 1; j < cols; j++) { | |
1701 | row.push(data.getValue(i, j)); | |
1702 | } | |
1703 | } else { | |
1704 | for (var j = 0; j < cols - 1; j++) { | |
1705 | row.push([ data.getValue(i, 1 + 2 * j), data.getValue(i, 2 + 2 * j) ]); | |
1706 | } | |
79420a1e | 1707 | } |
243d96e8 | 1708 | ret.push(row); |
79420a1e DV |
1709 | } |
1710 | return ret; | |
1711 | } | |
1712 | ||
24e5350c | 1713 | // These functions are all based on MochiKit. |
fc80a396 DV |
1714 | Dygraph.update = function (self, o) { |
1715 | if (typeof(o) != 'undefined' && o !== null) { | |
1716 | for (var k in o) { | |
85b99f0b DV |
1717 | if (o.hasOwnProperty(k)) { |
1718 | self[k] = o[k]; | |
1719 | } | |
fc80a396 DV |
1720 | } |
1721 | } | |
1722 | return self; | |
1723 | }; | |
1724 | ||
2dda3850 DV |
1725 | Dygraph.isArrayLike = function (o) { |
1726 | var typ = typeof(o); | |
1727 | if ( | |
1728 | (typ != 'object' && !(typ == 'function' && | |
1729 | typeof(o.item) == 'function')) || | |
1730 | o === null || | |
1731 | typeof(o.length) != 'number' || | |
1732 | o.nodeType === 3 | |
1733 | ) { | |
1734 | return false; | |
1735 | } | |
1736 | return true; | |
1737 | }; | |
1738 | ||
1739 | Dygraph.isDateLike = function (o) { | |
1740 | if (typeof(o) != "object" || o === null || | |
1741 | typeof(o.getTime) != 'function') { | |
1742 | return false; | |
1743 | } | |
1744 | return true; | |
1745 | }; | |
1746 | ||
e3ab7b40 DV |
1747 | Dygraph.clone = function(o) { |
1748 | // TODO(danvk): figure out how MochiKit's version works | |
1749 | var r = []; | |
1750 | for (var i = 0; i < o.length; i++) { | |
1751 | if (Dygraph.isArrayLike(o[i])) { | |
1752 | r.push(Dygraph.clone(o[i])); | |
1753 | } else { | |
1754 | r.push(o[i]); | |
1755 | } | |
1756 | } | |
1757 | return r; | |
24e5350c DV |
1758 | }; |
1759 | ||
2dda3850 | 1760 | |
79420a1e | 1761 | /** |
6a1aa64f DV |
1762 | * Get the CSV data. If it's in a function, call that function. If it's in a |
1763 | * file, do an XMLHttpRequest to get it. | |
1764 | * @private | |
1765 | */ | |
285a6bda | 1766 | Dygraph.prototype.start_ = function() { |
6a1aa64f | 1767 | if (typeof this.file_ == 'function') { |
285a6bda | 1768 | // CSV string. Pretend we got it via XHR. |
6a1aa64f | 1769 | this.loadedEvent_(this.file_()); |
2dda3850 | 1770 | } else if (Dygraph.isArrayLike(this.file_)) { |
285a6bda DV |
1771 | this.rawData_ = this.parseArray_(this.file_); |
1772 | this.drawGraph_(this.rawData_); | |
79420a1e DV |
1773 | } else if (typeof this.file_ == 'object' && |
1774 | typeof this.file_.getColumnRange == 'function') { | |
1775 | // must be a DataTable from gviz. | |
1776 | this.rawData_ = this.parseDataTable_(this.file_); | |
1777 | this.drawGraph_(this.rawData_); | |
285a6bda DV |
1778 | } else if (typeof this.file_ == 'string') { |
1779 | // Heuristic: a newline means it's CSV data. Otherwise it's an URL. | |
1780 | if (this.file_.indexOf('\n') >= 0) { | |
1781 | this.loadedEvent_(this.file_); | |
1782 | } else { | |
1783 | var req = new XMLHttpRequest(); | |
1784 | var caller = this; | |
1785 | req.onreadystatechange = function () { | |
1786 | if (req.readyState == 4) { | |
1787 | if (req.status == 200) { | |
1788 | caller.loadedEvent_(req.responseText); | |
1789 | } | |
6a1aa64f | 1790 | } |
285a6bda | 1791 | }; |
6a1aa64f | 1792 | |
285a6bda DV |
1793 | req.open("GET", this.file_, true); |
1794 | req.send(null); | |
1795 | } | |
1796 | } else { | |
1797 | this.error("Unknown data format: " + (typeof this.file_)); | |
6a1aa64f DV |
1798 | } |
1799 | }; | |
1800 | ||
1801 | /** | |
1802 | * Changes various properties of the graph. These can include: | |
1803 | * <ul> | |
1804 | * <li>file: changes the source data for the graph</li> | |
1805 | * <li>errorBars: changes whether the data contains stddev</li> | |
1806 | * </ul> | |
1807 | * @param {Object} attrs The new properties and values | |
1808 | */ | |
285a6bda DV |
1809 | Dygraph.prototype.updateOptions = function(attrs) { |
1810 | // TODO(danvk): this is a mess. Rethink this function. | |
6a1aa64f DV |
1811 | if (attrs.rollPeriod) { |
1812 | this.rollPeriod_ = attrs.rollPeriod; | |
1813 | } | |
1814 | if (attrs.dateWindow) { | |
1815 | this.dateWindow_ = attrs.dateWindow; | |
1816 | } | |
1817 | if (attrs.valueRange) { | |
1818 | this.valueRange_ = attrs.valueRange; | |
1819 | } | |
fc80a396 | 1820 | Dygraph.update(this.user_attrs_, attrs); |
285a6bda DV |
1821 | |
1822 | this.labelsFromCSV_ = (this.attr_("labels") == null); | |
1823 | ||
1824 | // TODO(danvk): this doesn't match the constructor logic | |
1825 | this.layout_.updateOptions({ 'errorBars': this.attr_("errorBars") }); | |
6a1aa64f DV |
1826 | if (attrs['file'] && attrs['file'] != this.file_) { |
1827 | this.file_ = attrs['file']; | |
1828 | this.start_(); | |
1829 | } else { | |
1830 | this.drawGraph_(this.rawData_); | |
1831 | } | |
1832 | }; | |
1833 | ||
1834 | /** | |
697e70b2 DV |
1835 | * Resizes the dygraph. If no parameters are specified, resizes to fill the |
1836 | * containing div (which has presumably changed size since the dygraph was | |
1837 | * instantiated. If the width/height are specified, the div will be resized. | |
964f30c6 DV |
1838 | * |
1839 | * This is far more efficient than destroying and re-instantiating a | |
1840 | * Dygraph, since it doesn't have to reparse the underlying data. | |
1841 | * | |
697e70b2 DV |
1842 | * @param {Number} width Width (in pixels) |
1843 | * @param {Number} height Height (in pixels) | |
1844 | */ | |
1845 | Dygraph.prototype.resize = function(width, height) { | |
1846 | if ((width === null) != (height === null)) { | |
1847 | this.warn("Dygraph.resize() should be called with zero parameters or " + | |
1848 | "two non-NULL parameters. Pretending it was zero."); | |
1849 | width = height = null; | |
1850 | } | |
1851 | ||
b16e6369 | 1852 | // TODO(danvk): there should be a clear() method. |
697e70b2 | 1853 | this.maindiv_.innerHTML = ""; |
b16e6369 DV |
1854 | this.attrs_.labelsDiv = null; |
1855 | ||
697e70b2 DV |
1856 | if (width) { |
1857 | this.maindiv_.style.width = width + "px"; | |
1858 | this.maindiv_.style.height = height + "px"; | |
1859 | this.width_ = width; | |
1860 | this.height_ = height; | |
1861 | } else { | |
1862 | this.width_ = this.maindiv_.offsetWidth; | |
1863 | this.height_ = this.maindiv_.offsetHeight; | |
1864 | } | |
1865 | ||
1866 | this.createInterface_(); | |
964f30c6 | 1867 | this.drawGraph_(this.rawData_); |
697e70b2 DV |
1868 | }; |
1869 | ||
1870 | /** | |
6a1aa64f DV |
1871 | * Adjusts the number of days in the rolling average. Updates the graph to |
1872 | * reflect the new averaging period. | |
1873 | * @param {Number} length Number of days over which to average the data. | |
1874 | */ | |
285a6bda | 1875 | Dygraph.prototype.adjustRoll = function(length) { |
6a1aa64f DV |
1876 | this.rollPeriod_ = length; |
1877 | this.drawGraph_(this.rawData_); | |
1878 | }; | |
540d00f1 | 1879 | |
f8cfec73 | 1880 | /** |
1cf11047 DV |
1881 | * Returns a boolean array of visibility statuses. |
1882 | */ | |
1883 | Dygraph.prototype.visibility = function() { | |
1884 | // Do lazy-initialization, so that this happens after we know the number of | |
1885 | // data series. | |
1886 | if (!this.attr_("visibility")) { | |
f38dec01 | 1887 | this.attrs_["visibility"] = []; |
1cf11047 DV |
1888 | } |
1889 | while (this.attr_("visibility").length < this.rawData_[0].length - 1) { | |
f38dec01 | 1890 | this.attr_("visibility").push(true); |
1cf11047 DV |
1891 | } |
1892 | return this.attr_("visibility"); | |
1893 | }; | |
1894 | ||
1895 | /** | |
1896 | * Changes the visiblity of a series. | |
1897 | */ | |
1898 | Dygraph.prototype.setVisibility = function(num, value) { | |
1899 | var x = this.visibility(); | |
1900 | if (num < 0 && num >= x.length) { | |
1901 | this.warn("invalid series number in setVisibility: " + num); | |
1902 | } else { | |
1903 | x[num] = value; | |
1904 | this.drawGraph_(this.rawData_); | |
1905 | } | |
1906 | }; | |
1907 | ||
1908 | /** | |
f8cfec73 DV |
1909 | * Create a new canvas element. This is more complex than a simple |
1910 | * document.createElement("canvas") because of IE and excanvas. | |
1911 | */ | |
1912 | Dygraph.createCanvas = function() { | |
1913 | var canvas = document.createElement("canvas"); | |
1914 | ||
1915 | isIE = (/MSIE/.test(navigator.userAgent) && !window.opera); | |
1916 | if (isIE) { | |
1917 | canvas = G_vmlCanvasManager.initElement(canvas); | |
1918 | } | |
1919 | ||
1920 | return canvas; | |
1921 | }; | |
1922 | ||
540d00f1 DV |
1923 | |
1924 | /** | |
285a6bda | 1925 | * A wrapper around Dygraph that implements the gviz API. |
540d00f1 DV |
1926 | * @param {Object} container The DOM object the visualization should live in. |
1927 | */ | |
285a6bda | 1928 | Dygraph.GVizChart = function(container) { |
540d00f1 DV |
1929 | this.container = container; |
1930 | } | |
1931 | ||
285a6bda | 1932 | Dygraph.GVizChart.prototype.draw = function(data, options) { |
540d00f1 | 1933 | this.container.innerHTML = ''; |
285a6bda | 1934 | this.date_graph = new Dygraph(this.container, data, options); |
540d00f1 | 1935 | } |
285a6bda DV |
1936 | |
1937 | // Older pages may still use this name. | |
1938 | DateGraph = Dygraph; |