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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 | ||
ff00d3e2 | 111 | logScale: false, |
285a6bda DV |
112 | sigma: 2.0, |
113 | errorBars: false, | |
114 | fractions: false, | |
115 | wilsonInterval: true, // only relevant if fractions is true | |
5954ef32 DV |
116 | customBars: false, |
117 | fillGraph: false | |
285a6bda DV |
118 | }; |
119 | ||
120 | // Various logging levels. | |
121 | Dygraph.DEBUG = 1; | |
122 | Dygraph.INFO = 2; | |
123 | Dygraph.WARNING = 3; | |
124 | Dygraph.ERROR = 3; | |
125 | ||
126 | Dygraph.prototype.__old_init__ = function(div, file, labels, attrs) { | |
127 | // Labels is no longer a constructor parameter, since it's typically set | |
128 | // directly from the data source. It also conains a name for the x-axis, | |
129 | // which the previous constructor form did not. | |
130 | if (labels != null) { | |
131 | var new_labels = ["Date"]; | |
132 | for (var i = 0; i < labels.length; i++) new_labels.push(labels[i]); | |
fc80a396 | 133 | Dygraph.update(attrs, { 'labels': new_labels }); |
285a6bda DV |
134 | } |
135 | this.__init__(div, file, attrs); | |
8e4a6af3 DV |
136 | }; |
137 | ||
6a1aa64f | 138 | /** |
285a6bda | 139 | * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit |
6a1aa64f DV |
140 | * and interaction <canvas> inside of it. See the constructor for details |
141 | * on the parameters. | |
142 | * @param {String | Function} file Source data | |
143 | * @param {Array.<String>} labels Names of the data series | |
144 | * @param {Object} attrs Miscellaneous other options | |
145 | * @private | |
146 | */ | |
285a6bda DV |
147 | Dygraph.prototype.__init__ = function(div, file, attrs) { |
148 | // Support two-argument constructor | |
149 | if (attrs == null) { attrs = {}; } | |
150 | ||
6a1aa64f | 151 | // Copy the important bits into the object |
32988383 | 152 | // TODO(danvk): most of these should just stay in the attrs_ dictionary. |
6a1aa64f | 153 | this.maindiv_ = div; |
6a1aa64f | 154 | this.file_ = file; |
285a6bda | 155 | this.rollPeriod_ = attrs.rollPeriod || Dygraph.DEFAULT_ROLL_PERIOD; |
6a1aa64f | 156 | this.previousVerticalX_ = -1; |
6a1aa64f | 157 | this.fractions_ = attrs.fractions || false; |
6a1aa64f DV |
158 | this.dateWindow_ = attrs.dateWindow || null; |
159 | this.valueRange_ = attrs.valueRange || null; | |
6a1aa64f | 160 | this.wilsonInterval_ = attrs.wilsonInterval || true; |
8e4a6af3 | 161 | |
f7d6278e DV |
162 | // Clear the div. This ensure that, if multiple dygraphs are passed the same |
163 | // div, then only one will be drawn. | |
164 | div.innerHTML = ""; | |
165 | ||
285a6bda DV |
166 | // If the div isn't already sized then give it a default size. |
167 | if (div.style.width == '') { | |
168 | div.style.width = Dygraph.DEFAULT_WIDTH + "px"; | |
169 | } | |
170 | if (div.style.height == '') { | |
171 | div.style.height = Dygraph.DEFAULT_HEIGHT + "px"; | |
32988383 | 172 | } |
285a6bda DV |
173 | this.width_ = parseInt(div.style.width, 10); |
174 | this.height_ = parseInt(div.style.height, 10); | |
32988383 | 175 | |
285a6bda DV |
176 | // Dygraphs has many options, some of which interact with one another. |
177 | // To keep track of everything, we maintain two sets of options: | |
178 | // | |
179 | // this.user_attrs_ only options explicitly set by the user. | |
180 | // this.attrs_ defaults, options derived from user_attrs_, data. | |
181 | // | |
182 | // Options are then accessed this.attr_('attr'), which first looks at | |
183 | // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent | |
184 | // defaults without overriding behavior that the user specifically asks for. | |
185 | this.user_attrs_ = {}; | |
fc80a396 | 186 | Dygraph.update(this.user_attrs_, attrs); |
6a1aa64f | 187 | |
285a6bda | 188 | this.attrs_ = {}; |
fc80a396 | 189 | Dygraph.update(this.attrs_, Dygraph.DEFAULT_ATTRS); |
6a1aa64f | 190 | |
285a6bda DV |
191 | // Make a note of whether labels will be pulled from the CSV file. |
192 | this.labelsFromCSV_ = (this.attr_("labels") == null); | |
6a1aa64f DV |
193 | |
194 | // Create the containing DIV and other interactive elements | |
195 | this.createInterface_(); | |
196 | ||
738fc797 | 197 | this.start_(); |
6a1aa64f DV |
198 | }; |
199 | ||
285a6bda DV |
200 | Dygraph.prototype.attr_ = function(name) { |
201 | if (typeof(this.user_attrs_[name]) != 'undefined') { | |
202 | return this.user_attrs_[name]; | |
203 | } else if (typeof(this.attrs_[name]) != 'undefined') { | |
204 | return this.attrs_[name]; | |
205 | } else { | |
206 | return null; | |
207 | } | |
208 | }; | |
209 | ||
210 | // TODO(danvk): any way I can get the line numbers to be this.warn call? | |
211 | Dygraph.prototype.log = function(severity, message) { | |
212 | if (typeof(console) != 'undefined') { | |
213 | switch (severity) { | |
214 | case Dygraph.DEBUG: | |
215 | console.debug('dygraphs: ' + message); | |
216 | break; | |
217 | case Dygraph.INFO: | |
218 | console.info('dygraphs: ' + message); | |
219 | break; | |
220 | case Dygraph.WARNING: | |
221 | console.warn('dygraphs: ' + message); | |
222 | break; | |
223 | case Dygraph.ERROR: | |
224 | console.error('dygraphs: ' + message); | |
225 | break; | |
226 | } | |
227 | } | |
228 | } | |
229 | Dygraph.prototype.info = function(message) { | |
230 | this.log(Dygraph.INFO, message); | |
231 | } | |
232 | Dygraph.prototype.warn = function(message) { | |
233 | this.log(Dygraph.WARNING, message); | |
234 | } | |
235 | Dygraph.prototype.error = function(message) { | |
236 | this.log(Dygraph.ERROR, message); | |
237 | } | |
238 | ||
6a1aa64f DV |
239 | /** |
240 | * Returns the current rolling period, as set by the user or an option. | |
241 | * @return {Number} The number of days in the rolling window | |
242 | */ | |
285a6bda | 243 | Dygraph.prototype.rollPeriod = function() { |
6a1aa64f | 244 | return this.rollPeriod_; |
76171648 DV |
245 | }; |
246 | ||
247 | Dygraph.addEvent = function(el, evt, fn) { | |
248 | var normed_fn = function(e) { | |
249 | if (!e) var e = window.event; | |
250 | fn(e); | |
251 | }; | |
252 | if (window.addEventListener) { // Mozilla, Netscape, Firefox | |
253 | el.addEventListener(evt, normed_fn, false); | |
254 | } else { // IE | |
255 | el.attachEvent('on' + evt, normed_fn); | |
256 | } | |
257 | }; | |
6a1aa64f DV |
258 | |
259 | /** | |
285a6bda | 260 | * Generates interface elements for the Dygraph: a containing div, a div to |
6a1aa64f | 261 | * display the current point, and a textbox to adjust the rolling average |
697e70b2 | 262 | * period. Also creates the Renderer/Layout elements. |
6a1aa64f DV |
263 | * @private |
264 | */ | |
285a6bda | 265 | Dygraph.prototype.createInterface_ = function() { |
6a1aa64f DV |
266 | // Create the all-enclosing graph div |
267 | var enclosing = this.maindiv_; | |
268 | ||
b0c3b730 DV |
269 | this.graphDiv = document.createElement("div"); |
270 | this.graphDiv.style.width = this.width_ + "px"; | |
271 | this.graphDiv.style.height = this.height_ + "px"; | |
272 | enclosing.appendChild(this.graphDiv); | |
273 | ||
274 | // Create the canvas for interactive parts of the chart. | |
f8cfec73 DV |
275 | // this.canvas_ = document.createElement("canvas"); |
276 | this.canvas_ = Dygraph.createCanvas(); | |
b0c3b730 DV |
277 | this.canvas_.style.position = "absolute"; |
278 | this.canvas_.width = this.width_; | |
279 | this.canvas_.height = this.height_; | |
f8cfec73 DV |
280 | this.canvas_.style.width = this.width_ + "px"; // for IE |
281 | this.canvas_.style.height = this.height_ + "px"; // for IE | |
b0c3b730 DV |
282 | this.graphDiv.appendChild(this.canvas_); |
283 | ||
284 | // ... and for static parts of the chart. | |
6a1aa64f | 285 | this.hidden_ = this.createPlotKitCanvas_(this.canvas_); |
76171648 DV |
286 | |
287 | var dygraph = this; | |
288 | Dygraph.addEvent(this.hidden_, 'mousemove', function(e) { | |
289 | dygraph.mouseMove_(e); | |
290 | }); | |
291 | Dygraph.addEvent(this.hidden_, 'mouseout', function(e) { | |
292 | dygraph.mouseOut_(e); | |
293 | }); | |
697e70b2 DV |
294 | |
295 | // Create the grapher | |
296 | // TODO(danvk): why does the Layout need its own set of options? | |
297 | this.layoutOptions_ = { 'xOriginIsZero': false }; | |
298 | Dygraph.update(this.layoutOptions_, this.attrs_); | |
299 | Dygraph.update(this.layoutOptions_, this.user_attrs_); | |
300 | Dygraph.update(this.layoutOptions_, { | |
301 | 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) }); | |
302 | ||
303 | this.layout_ = new DygraphLayout(this, this.layoutOptions_); | |
304 | ||
305 | // TODO(danvk): why does the Renderer need its own set of options? | |
306 | this.renderOptions_ = { colorScheme: this.colors_, | |
307 | strokeColor: null, | |
308 | axisLineWidth: Dygraph.AXIS_LINE_WIDTH }; | |
309 | Dygraph.update(this.renderOptions_, this.attrs_); | |
310 | Dygraph.update(this.renderOptions_, this.user_attrs_); | |
311 | this.plotter_ = new DygraphCanvasRenderer(this, | |
312 | this.hidden_, this.layout_, | |
313 | this.renderOptions_); | |
314 | ||
315 | this.createStatusMessage_(); | |
316 | this.createRollInterface_(); | |
317 | this.createDragInterface_(); | |
6a1aa64f DV |
318 | } |
319 | ||
320 | /** | |
321 | * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on | |
285a6bda | 322 | * this particular canvas. All Dygraph work is done on this.canvas_. |
8846615a | 323 | * @param {Object} canvas The Dygraph canvas over which to overlay the plot |
6a1aa64f DV |
324 | * @return {Object} The newly-created canvas |
325 | * @private | |
326 | */ | |
285a6bda | 327 | Dygraph.prototype.createPlotKitCanvas_ = function(canvas) { |
f8cfec73 DV |
328 | // var h = document.createElement("canvas"); |
329 | var h = Dygraph.createCanvas(); | |
6a1aa64f DV |
330 | h.style.position = "absolute"; |
331 | h.style.top = canvas.style.top; | |
332 | h.style.left = canvas.style.left; | |
333 | h.width = this.width_; | |
334 | h.height = this.height_; | |
f8cfec73 DV |
335 | h.style.width = this.width_ + "px"; // for IE |
336 | h.style.height = this.height_ + "px"; // for IE | |
b0c3b730 | 337 | this.graphDiv.appendChild(h); |
6a1aa64f DV |
338 | return h; |
339 | }; | |
340 | ||
f474c2a3 DV |
341 | // Taken from MochiKit.Color |
342 | Dygraph.hsvToRGB = function (hue, saturation, value) { | |
343 | var red; | |
344 | var green; | |
345 | var blue; | |
346 | if (saturation === 0) { | |
347 | red = value; | |
348 | green = value; | |
349 | blue = value; | |
350 | } else { | |
351 | var i = Math.floor(hue * 6); | |
352 | var f = (hue * 6) - i; | |
353 | var p = value * (1 - saturation); | |
354 | var q = value * (1 - (saturation * f)); | |
355 | var t = value * (1 - (saturation * (1 - f))); | |
356 | switch (i) { | |
357 | case 1: red = q; green = value; blue = p; break; | |
358 | case 2: red = p; green = value; blue = t; break; | |
359 | case 3: red = p; green = q; blue = value; break; | |
360 | case 4: red = t; green = p; blue = value; break; | |
361 | case 5: red = value; green = p; blue = q; break; | |
362 | case 6: // fall through | |
363 | case 0: red = value; green = t; blue = p; break; | |
364 | } | |
365 | } | |
366 | red = Math.floor(255 * red + 0.5); | |
367 | green = Math.floor(255 * green + 0.5); | |
368 | blue = Math.floor(255 * blue + 0.5); | |
369 | return 'rgb(' + red + ',' + green + ',' + blue + ')'; | |
370 | }; | |
371 | ||
372 | ||
6a1aa64f DV |
373 | /** |
374 | * Generate a set of distinct colors for the data series. This is done with a | |
375 | * color wheel. Saturation/Value are customizable, and the hue is | |
376 | * equally-spaced around the color wheel. If a custom set of colors is | |
377 | * specified, that is used instead. | |
6a1aa64f DV |
378 | * @private |
379 | */ | |
285a6bda DV |
380 | Dygraph.prototype.setColors_ = function() { |
381 | // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do | |
382 | // away with this.renderOptions_. | |
383 | var num = this.attr_("labels").length - 1; | |
6a1aa64f | 384 | this.colors_ = []; |
285a6bda DV |
385 | var colors = this.attr_('colors'); |
386 | if (!colors) { | |
387 | var sat = this.attr_('colorSaturation') || 1.0; | |
388 | var val = this.attr_('colorValue') || 0.5; | |
6a1aa64f DV |
389 | for (var i = 1; i <= num; i++) { |
390 | var hue = (1.0*i/(1+num)); | |
f474c2a3 | 391 | this.colors_.push( Dygraph.hsvToRGB(hue, sat, val) ); |
6a1aa64f DV |
392 | } |
393 | } else { | |
394 | for (var i = 0; i < num; i++) { | |
285a6bda | 395 | var colorStr = colors[i % colors.length]; |
f474c2a3 | 396 | this.colors_.push(colorStr); |
6a1aa64f DV |
397 | } |
398 | } | |
285a6bda DV |
399 | |
400 | // TODO(danvk): update this w/r/t/ the new options system. | |
401 | this.renderOptions_.colorScheme = this.colors_; | |
fc80a396 DV |
402 | Dygraph.update(this.plotter_.options, this.renderOptions_); |
403 | Dygraph.update(this.layoutOptions_, this.user_attrs_); | |
404 | Dygraph.update(this.layoutOptions_, this.attrs_); | |
6a1aa64f DV |
405 | } |
406 | ||
3df0ccf0 DV |
407 | // The following functions are from quirksmode.org |
408 | // http://www.quirksmode.org/js/findpos.html | |
409 | Dygraph.findPosX = function(obj) { | |
410 | var curleft = 0; | |
411 | if (obj.offsetParent) { | |
412 | while (obj.offsetParent) { | |
413 | curleft += obj.offsetLeft; | |
414 | obj = obj.offsetParent; | |
415 | } | |
416 | } | |
417 | else if (obj.x) | |
418 | curleft += obj.x; | |
419 | return curleft; | |
420 | }; | |
421 | ||
422 | Dygraph.findPosY = function(obj) { | |
423 | var curtop = 0; | |
424 | if (obj.offsetParent) { | |
425 | while (obj.offsetParent) { | |
426 | curtop += obj.offsetTop; | |
427 | obj = obj.offsetParent; | |
428 | } | |
429 | } | |
430 | else if (obj.y) | |
431 | curtop += obj.y; | |
432 | return curtop; | |
433 | }; | |
434 | ||
6a1aa64f DV |
435 | /** |
436 | * Create the div that contains information on the selected point(s) | |
437 | * This goes in the top right of the canvas, unless an external div has already | |
438 | * been specified. | |
439 | * @private | |
440 | */ | |
285a6bda DV |
441 | Dygraph.prototype.createStatusMessage_ = function(){ |
442 | if (!this.attr_("labelsDiv")) { | |
443 | var divWidth = this.attr_('labelsDivWidth'); | |
b0c3b730 | 444 | var messagestyle = { |
6a1aa64f DV |
445 | "position": "absolute", |
446 | "fontSize": "14px", | |
447 | "zIndex": 10, | |
448 | "width": divWidth + "px", | |
449 | "top": "0px", | |
8846615a | 450 | "left": (this.width_ - divWidth - 2) + "px", |
6a1aa64f DV |
451 | "background": "white", |
452 | "textAlign": "left", | |
b0c3b730 | 453 | "overflow": "hidden"}; |
fc80a396 | 454 | Dygraph.update(messagestyle, this.attr_('labelsDivStyles')); |
b0c3b730 DV |
455 | var div = document.createElement("div"); |
456 | for (var name in messagestyle) { | |
85b99f0b DV |
457 | if (messagestyle.hasOwnProperty(name)) { |
458 | div.style[name] = messagestyle[name]; | |
459 | } | |
b0c3b730 DV |
460 | } |
461 | this.graphDiv.appendChild(div); | |
285a6bda | 462 | this.attrs_.labelsDiv = div; |
6a1aa64f DV |
463 | } |
464 | }; | |
465 | ||
466 | /** | |
467 | * Create the text box to adjust the averaging period | |
468 | * @return {Object} The newly-created text box | |
469 | * @private | |
470 | */ | |
285a6bda | 471 | Dygraph.prototype.createRollInterface_ = function() { |
285a6bda | 472 | var display = this.attr_('showRoller') ? "block" : "none"; |
b0c3b730 DV |
473 | var textAttr = { "position": "absolute", |
474 | "zIndex": 10, | |
475 | "top": (this.plotter_.area.h - 25) + "px", | |
476 | "left": (this.plotter_.area.x + 1) + "px", | |
477 | "display": display | |
6a1aa64f | 478 | }; |
b0c3b730 DV |
479 | var roller = document.createElement("input"); |
480 | roller.type = "text"; | |
481 | roller.size = "2"; | |
482 | roller.value = this.rollPeriod_; | |
483 | for (var name in textAttr) { | |
85b99f0b DV |
484 | if (textAttr.hasOwnProperty(name)) { |
485 | roller.style[name] = textAttr[name]; | |
486 | } | |
b0c3b730 DV |
487 | } |
488 | ||
6a1aa64f | 489 | var pa = this.graphDiv; |
b0c3b730 | 490 | pa.appendChild(roller); |
76171648 DV |
491 | var dygraph = this; |
492 | roller.onchange = function() { dygraph.adjustRoll(roller.value); }; | |
6a1aa64f | 493 | return roller; |
76171648 DV |
494 | }; |
495 | ||
496 | // These functions are taken from MochiKit.Signal | |
497 | Dygraph.pageX = function(e) { | |
498 | if (e.pageX) { | |
499 | return (!e.pageX || e.pageX < 0) ? 0 : e.pageX; | |
500 | } else { | |
501 | var de = document; | |
502 | var b = document.body; | |
503 | return e.clientX + | |
504 | (de.scrollLeft || b.scrollLeft) - | |
505 | (de.clientLeft || 0); | |
506 | } | |
507 | }; | |
508 | ||
509 | Dygraph.pageY = function(e) { | |
510 | if (e.pageY) { | |
511 | return (!e.pageY || e.pageY < 0) ? 0 : e.pageY; | |
512 | } else { | |
513 | var de = document; | |
514 | var b = document.body; | |
515 | return e.clientY + | |
516 | (de.scrollTop || b.scrollTop) - | |
517 | (de.clientTop || 0); | |
518 | } | |
519 | }; | |
6a1aa64f DV |
520 | |
521 | /** | |
522 | * Set up all the mouse handlers needed to capture dragging behavior for zoom | |
27385109 | 523 | * events. |
6a1aa64f DV |
524 | * @private |
525 | */ | |
285a6bda | 526 | Dygraph.prototype.createDragInterface_ = function() { |
6a1aa64f DV |
527 | var self = this; |
528 | ||
529 | // Tracks whether the mouse is down right now | |
bce01b0f | 530 | var isZooming = false; |
c776c216 | 531 | var isPanning = false; |
6a1aa64f DV |
532 | var dragStartX = null; |
533 | var dragStartY = null; | |
534 | var dragEndX = null; | |
535 | var dragEndY = null; | |
536 | var prevEndX = null; | |
bce01b0f DV |
537 | var draggingDate = null; |
538 | var dateRange = null; | |
6a1aa64f DV |
539 | |
540 | // Utility function to convert page-wide coordinates to canvas coords | |
67e650dc DV |
541 | var px = 0; |
542 | var py = 0; | |
76171648 DV |
543 | var getX = function(e) { return Dygraph.pageX(e) - px }; |
544 | var getY = function(e) { return Dygraph.pageX(e) - py }; | |
6a1aa64f DV |
545 | |
546 | // Draw zoom rectangles when the mouse is down and the user moves around | |
76171648 | 547 | Dygraph.addEvent(this.hidden_, 'mousemove', function(event) { |
bce01b0f | 548 | if (isZooming) { |
6a1aa64f DV |
549 | dragEndX = getX(event); |
550 | dragEndY = getY(event); | |
551 | ||
552 | self.drawZoomRect_(dragStartX, dragEndX, prevEndX); | |
553 | prevEndX = dragEndX; | |
bce01b0f DV |
554 | } else if (isPanning) { |
555 | dragEndX = getX(event); | |
556 | dragEndY = getY(event); | |
557 | ||
558 | // Want to have it so that: | |
559 | // 1. draggingDate appears at dragEndX | |
560 | // 2. daterange = (dateWindow_[1] - dateWindow_[0]) is unaltered. | |
561 | ||
562 | self.dateWindow_[0] = draggingDate - (dragEndX / self.width_) * dateRange; | |
563 | self.dateWindow_[1] = self.dateWindow_[0] + dateRange; | |
564 | self.drawGraph_(self.rawData_); | |
6a1aa64f DV |
565 | } |
566 | }); | |
567 | ||
568 | // Track the beginning of drag events | |
76171648 | 569 | Dygraph.addEvent(this.hidden_, 'mousedown', function(event) { |
3df0ccf0 DV |
570 | px = Dygraph.findPosX(self.canvas_); |
571 | py = Dygraph.findPosY(self.canvas_); | |
6a1aa64f DV |
572 | dragStartX = getX(event); |
573 | dragStartY = getY(event); | |
bce01b0f | 574 | |
2dab69c3 | 575 | if (event.altKey || event.shiftKey) { |
d12999d3 | 576 | if (!self.dateWindow_) return; // have to be zoomed in to pan. |
bce01b0f DV |
577 | isPanning = true; |
578 | dateRange = self.dateWindow_[1] - self.dateWindow_[0]; | |
d12999d3 DV |
579 | draggingDate = (dragStartX / self.width_) * dateRange + |
580 | self.dateWindow_[0]; | |
bce01b0f DV |
581 | } else { |
582 | isZooming = true; | |
583 | } | |
6a1aa64f DV |
584 | }); |
585 | ||
586 | // If the user releases the mouse button during a drag, but not over the | |
587 | // canvas, then it doesn't count as a zooming action. | |
76171648 | 588 | Dygraph.addEvent(document, 'mouseup', function(event) { |
bce01b0f DV |
589 | if (isZooming || isPanning) { |
590 | isZooming = false; | |
6a1aa64f DV |
591 | dragStartX = null; |
592 | dragStartY = null; | |
593 | } | |
bce01b0f DV |
594 | |
595 | if (isPanning) { | |
596 | isPanning = false; | |
597 | draggingDate = null; | |
598 | dateRange = null; | |
599 | } | |
6a1aa64f DV |
600 | }); |
601 | ||
602 | // Temporarily cancel the dragging event when the mouse leaves the graph | |
76171648 | 603 | Dygraph.addEvent(this.hidden_, 'mouseout', function(event) { |
bce01b0f | 604 | if (isZooming) { |
6a1aa64f DV |
605 | dragEndX = null; |
606 | dragEndY = null; | |
607 | } | |
608 | }); | |
609 | ||
610 | // If the mouse is released on the canvas during a drag event, then it's a | |
611 | // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels) | |
76171648 | 612 | Dygraph.addEvent(this.hidden_, 'mouseup', function(event) { |
bce01b0f DV |
613 | if (isZooming) { |
614 | isZooming = false; | |
6a1aa64f DV |
615 | dragEndX = getX(event); |
616 | dragEndY = getY(event); | |
617 | var regionWidth = Math.abs(dragEndX - dragStartX); | |
618 | var regionHeight = Math.abs(dragEndY - dragStartY); | |
619 | ||
620 | if (regionWidth < 2 && regionHeight < 2 && | |
285a6bda | 621 | self.attr_('clickCallback') != null && |
6a1aa64f | 622 | self.lastx_ != undefined) { |
b258a3da DV |
623 | // TODO(danvk): pass along more info about the points. |
624 | self.attr_('clickCallback')(event, self.lastx_, self.selPoints_); | |
6a1aa64f DV |
625 | } |
626 | ||
627 | if (regionWidth >= 10) { | |
628 | self.doZoom_(Math.min(dragStartX, dragEndX), | |
629 | Math.max(dragStartX, dragEndX)); | |
630 | } else { | |
631 | self.canvas_.getContext("2d").clearRect(0, 0, | |
632 | self.canvas_.width, | |
633 | self.canvas_.height); | |
634 | } | |
635 | ||
636 | dragStartX = null; | |
637 | dragStartY = null; | |
638 | } | |
bce01b0f DV |
639 | |
640 | if (isPanning) { | |
641 | isPanning = false; | |
642 | draggingDate = null; | |
643 | dateRange = null; | |
644 | } | |
6a1aa64f DV |
645 | }); |
646 | ||
647 | // Double-clicking zooms back out | |
76171648 | 648 | Dygraph.addEvent(this.hidden_, 'dblclick', function(event) { |
b258a3da | 649 | if (self.dateWindow_ == null) return; |
6a1aa64f DV |
650 | self.dateWindow_ = null; |
651 | self.drawGraph_(self.rawData_); | |
652 | var minDate = self.rawData_[0][0]; | |
653 | var maxDate = self.rawData_[self.rawData_.length - 1][0]; | |
285a6bda DV |
654 | if (self.attr_("zoomCallback")) { |
655 | self.attr_("zoomCallback")(minDate, maxDate); | |
67e650dc | 656 | } |
6a1aa64f DV |
657 | }); |
658 | }; | |
659 | ||
660 | /** | |
661 | * Draw a gray zoom rectangle over the desired area of the canvas. Also clears | |
662 | * up any previous zoom rectangles that were drawn. This could be optimized to | |
663 | * avoid extra redrawing, but it's tricky to avoid interactions with the status | |
664 | * dots. | |
665 | * @param {Number} startX The X position where the drag started, in canvas | |
666 | * coordinates. | |
667 | * @param {Number} endX The current X position of the drag, in canvas coords. | |
668 | * @param {Number} prevEndX The value of endX on the previous call to this | |
669 | * function. Used to avoid excess redrawing | |
670 | * @private | |
671 | */ | |
285a6bda | 672 | Dygraph.prototype.drawZoomRect_ = function(startX, endX, prevEndX) { |
6a1aa64f DV |
673 | var ctx = this.canvas_.getContext("2d"); |
674 | ||
675 | // Clean up from the previous rect if necessary | |
676 | if (prevEndX) { | |
677 | ctx.clearRect(Math.min(startX, prevEndX), 0, | |
678 | Math.abs(startX - prevEndX), this.height_); | |
679 | } | |
680 | ||
681 | // Draw a light-grey rectangle to show the new viewing area | |
682 | if (endX && startX) { | |
683 | ctx.fillStyle = "rgba(128,128,128,0.33)"; | |
684 | ctx.fillRect(Math.min(startX, endX), 0, | |
685 | Math.abs(endX - startX), this.height_); | |
686 | } | |
687 | }; | |
688 | ||
689 | /** | |
690 | * Zoom to something containing [lowX, highX]. These are pixel coordinates | |
691 | * in the canvas. The exact zoom window may be slightly larger if there are no | |
692 | * data points near lowX or highX. This function redraws the graph. | |
693 | * @param {Number} lowX The leftmost pixel value that should be visible. | |
694 | * @param {Number} highX The rightmost pixel value that should be visible. | |
695 | * @private | |
696 | */ | |
285a6bda | 697 | Dygraph.prototype.doZoom_ = function(lowX, highX) { |
6a1aa64f DV |
698 | // Find the earliest and latest dates contained in this canvasx range. |
699 | var points = this.layout_.points; | |
700 | var minDate = null; | |
701 | var maxDate = null; | |
702 | // Find the nearest [minDate, maxDate] that contains [lowX, highX] | |
703 | for (var i = 0; i < points.length; i++) { | |
704 | var cx = points[i].canvasx; | |
705 | var x = points[i].xval; | |
706 | if (cx < lowX && (minDate == null || x > minDate)) minDate = x; | |
707 | if (cx > highX && (maxDate == null || x < maxDate)) maxDate = x; | |
708 | } | |
709 | // Use the extremes if either is missing | |
710 | if (minDate == null) minDate = points[0].xval; | |
711 | if (maxDate == null) maxDate = points[points.length-1].xval; | |
712 | ||
713 | this.dateWindow_ = [minDate, maxDate]; | |
714 | this.drawGraph_(this.rawData_); | |
285a6bda DV |
715 | if (this.attr_("zoomCallback")) { |
716 | this.attr_("zoomCallback")(minDate, maxDate); | |
67e650dc | 717 | } |
6a1aa64f DV |
718 | }; |
719 | ||
720 | /** | |
721 | * When the mouse moves in the canvas, display information about a nearby data | |
722 | * point and draw dots over those points in the data series. This function | |
723 | * takes care of cleanup of previously-drawn dots. | |
724 | * @param {Object} event The mousemove event from the browser. | |
725 | * @private | |
726 | */ | |
285a6bda | 727 | Dygraph.prototype.mouseMove_ = function(event) { |
76171648 | 728 | var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(this.hidden_); |
6a1aa64f DV |
729 | var points = this.layout_.points; |
730 | ||
731 | var lastx = -1; | |
732 | var lasty = -1; | |
733 | ||
734 | // Loop through all the points and find the date nearest to our current | |
735 | // location. | |
736 | var minDist = 1e+100; | |
737 | var idx = -1; | |
738 | for (var i = 0; i < points.length; i++) { | |
739 | var dist = Math.abs(points[i].canvasx - canvasx); | |
740 | if (dist > minDist) break; | |
741 | minDist = dist; | |
742 | idx = i; | |
743 | } | |
744 | if (idx >= 0) lastx = points[idx].xval; | |
745 | // Check that you can really highlight the last day's data | |
746 | if (canvasx > points[points.length-1].canvasx) | |
747 | lastx = points[points.length-1].xval; | |
748 | ||
749 | // Extract the points we've selected | |
b258a3da | 750 | this.selPoints_ = []; |
6a1aa64f DV |
751 | for (var i = 0; i < points.length; i++) { |
752 | if (points[i].xval == lastx) { | |
b258a3da | 753 | this.selPoints_.push(points[i]); |
6a1aa64f DV |
754 | } |
755 | } | |
756 | ||
b258a3da DV |
757 | if (this.attr_("highlightCallback")) { |
758 | this.attr_("highlightCallback")(event, lastx, this.selPoints_); | |
759 | } | |
760 | ||
6a1aa64f | 761 | // Clear the previously drawn vertical, if there is one |
285a6bda | 762 | var circleSize = this.attr_('highlightCircleSize'); |
6a1aa64f DV |
763 | var ctx = this.canvas_.getContext("2d"); |
764 | if (this.previousVerticalX_ >= 0) { | |
765 | var px = this.previousVerticalX_; | |
766 | ctx.clearRect(px - circleSize - 1, 0, 2 * circleSize + 2, this.height_); | |
767 | } | |
768 | ||
584ceeaa DV |
769 | var isOK = function(x) { return x && !isNaN(x); }; |
770 | ||
b258a3da DV |
771 | if (this.selPoints_.length > 0) { |
772 | var canvasx = this.selPoints_[0].canvasx; | |
6a1aa64f DV |
773 | |
774 | // Set the status message to indicate the selected point(s) | |
285a6bda | 775 | var replace = this.attr_('xValueFormatter')(lastx, this) + ":"; |
6a1aa64f | 776 | var clen = this.colors_.length; |
b258a3da DV |
777 | for (var i = 0; i < this.selPoints_.length; i++) { |
778 | if (!isOK(this.selPoints_[i].canvasy)) continue; | |
285a6bda | 779 | if (this.attr_("labelsSeparateLines")) { |
6a1aa64f DV |
780 | replace += "<br/>"; |
781 | } | |
b258a3da | 782 | var point = this.selPoints_[i]; |
f474c2a3 DV |
783 | var c = new RGBColor(this.colors_[i%clen]); |
784 | replace += " <b><font color='" + c.toHex() + "'>" | |
6a1aa64f DV |
785 | + point.name + "</font></b>:" |
786 | + this.round_(point.yval, 2); | |
787 | } | |
285a6bda | 788 | this.attr_("labelsDiv").innerHTML = replace; |
6a1aa64f DV |
789 | |
790 | // Save last x position for callbacks. | |
791 | this.lastx_ = lastx; | |
792 | ||
793 | // Draw colored circles over the center of each selected point | |
794 | ctx.save() | |
b258a3da DV |
795 | for (var i = 0; i < this.selPoints_.length; i++) { |
796 | if (!isOK(this.selPoints_[i%clen].canvasy)) continue; | |
6a1aa64f | 797 | ctx.beginPath(); |
f474c2a3 | 798 | ctx.fillStyle = this.colors_[i%clen]; |
b258a3da | 799 | ctx.arc(canvasx, this.selPoints_[i%clen].canvasy, circleSize, |
7bf6a9fe | 800 | 0, 2 * Math.PI, false); |
6a1aa64f DV |
801 | ctx.fill(); |
802 | } | |
803 | ctx.restore(); | |
804 | ||
805 | this.previousVerticalX_ = canvasx; | |
806 | } | |
807 | }; | |
808 | ||
809 | /** | |
810 | * The mouse has left the canvas. Clear out whatever artifacts remain | |
811 | * @param {Object} event the mouseout event from the browser. | |
812 | * @private | |
813 | */ | |
285a6bda | 814 | Dygraph.prototype.mouseOut_ = function(event) { |
6a1aa64f DV |
815 | // Get rid of the overlay data |
816 | var ctx = this.canvas_.getContext("2d"); | |
817 | ctx.clearRect(0, 0, this.width_, this.height_); | |
285a6bda | 818 | this.attr_("labelsDiv").innerHTML = ""; |
6a1aa64f DV |
819 | }; |
820 | ||
285a6bda | 821 | Dygraph.zeropad = function(x) { |
32988383 DV |
822 | if (x < 10) return "0" + x; else return "" + x; |
823 | } | |
824 | ||
6a1aa64f | 825 | /** |
6b8e33dd DV |
826 | * Return a string version of the hours, minutes and seconds portion of a date. |
827 | * @param {Number} date The JavaScript date (ms since epoch) | |
828 | * @return {String} A time of the form "HH:MM:SS" | |
829 | * @private | |
830 | */ | |
285a6bda DV |
831 | Dygraph.prototype.hmsString_ = function(date) { |
832 | var zeropad = Dygraph.zeropad; | |
6b8e33dd DV |
833 | var d = new Date(date); |
834 | if (d.getSeconds()) { | |
835 | return zeropad(d.getHours()) + ":" + | |
836 | zeropad(d.getMinutes()) + ":" + | |
837 | zeropad(d.getSeconds()); | |
838 | } else if (d.getMinutes()) { | |
839 | return zeropad(d.getHours()) + ":" + zeropad(d.getMinutes()); | |
840 | } else { | |
841 | return zeropad(d.getHours()); | |
842 | } | |
843 | } | |
844 | ||
845 | /** | |
6a1aa64f DV |
846 | * Convert a JS date (millis since epoch) to YYYY/MM/DD |
847 | * @param {Number} date The JavaScript date (ms since epoch) | |
848 | * @return {String} A date of the form "YYYY/MM/DD" | |
849 | * @private | |
285a6bda | 850 | * TODO(danvk): why is this part of the prototype? |
6a1aa64f | 851 | */ |
285a6bda DV |
852 | Dygraph.dateString_ = function(date, self) { |
853 | var zeropad = Dygraph.zeropad; | |
6a1aa64f DV |
854 | var d = new Date(date); |
855 | ||
856 | // Get the year: | |
857 | var year = "" + d.getFullYear(); | |
858 | // Get a 0 padded month string | |
6b8e33dd | 859 | var month = zeropad(d.getMonth() + 1); //months are 0-offset, sigh |
6a1aa64f | 860 | // Get a 0 padded day string |
6b8e33dd | 861 | var day = zeropad(d.getDate()); |
6a1aa64f | 862 | |
6b8e33dd DV |
863 | var ret = ""; |
864 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); | |
285a6bda | 865 | if (frac) ret = " " + self.hmsString_(date); |
6b8e33dd DV |
866 | |
867 | return year + "/" + month + "/" + day + ret; | |
6a1aa64f DV |
868 | }; |
869 | ||
870 | /** | |
871 | * Round a number to the specified number of digits past the decimal point. | |
872 | * @param {Number} num The number to round | |
873 | * @param {Number} places The number of decimals to which to round | |
874 | * @return {Number} The rounded number | |
875 | * @private | |
876 | */ | |
285a6bda | 877 | Dygraph.prototype.round_ = function(num, places) { |
6a1aa64f DV |
878 | var shift = Math.pow(10, places); |
879 | return Math.round(num * shift)/shift; | |
880 | }; | |
881 | ||
882 | /** | |
883 | * Fires when there's data available to be graphed. | |
884 | * @param {String} data Raw CSV data to be plotted | |
885 | * @private | |
886 | */ | |
285a6bda | 887 | Dygraph.prototype.loadedEvent_ = function(data) { |
6a1aa64f DV |
888 | this.rawData_ = this.parseCSV_(data); |
889 | this.drawGraph_(this.rawData_); | |
890 | }; | |
891 | ||
285a6bda | 892 | Dygraph.prototype.months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", |
8846615a | 893 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; |
285a6bda | 894 | Dygraph.prototype.quarters = ["Jan", "Apr", "Jul", "Oct"]; |
6a1aa64f DV |
895 | |
896 | /** | |
897 | * Add ticks on the x-axis representing years, months, quarters, weeks, or days | |
898 | * @private | |
899 | */ | |
285a6bda | 900 | Dygraph.prototype.addXTicks_ = function() { |
6a1aa64f DV |
901 | // Determine the correct ticks scale on the x-axis: quarterly, monthly, ... |
902 | var startDate, endDate; | |
903 | if (this.dateWindow_) { | |
904 | startDate = this.dateWindow_[0]; | |
905 | endDate = this.dateWindow_[1]; | |
906 | } else { | |
907 | startDate = this.rawData_[0][0]; | |
908 | endDate = this.rawData_[this.rawData_.length - 1][0]; | |
909 | } | |
910 | ||
285a6bda | 911 | var xTicks = this.attr_('xTicker')(startDate, endDate, this); |
6a1aa64f | 912 | this.layout_.updateOptions({xTicks: xTicks}); |
32988383 DV |
913 | }; |
914 | ||
915 | // Time granularity enumeration | |
285a6bda | 916 | Dygraph.SECONDLY = 0; |
20a41c17 DV |
917 | Dygraph.TWO_SECONDLY = 1; |
918 | Dygraph.FIVE_SECONDLY = 2; | |
919 | Dygraph.TEN_SECONDLY = 3; | |
920 | Dygraph.THIRTY_SECONDLY = 4; | |
921 | Dygraph.MINUTELY = 5; | |
922 | Dygraph.TWO_MINUTELY = 6; | |
923 | Dygraph.FIVE_MINUTELY = 7; | |
924 | Dygraph.TEN_MINUTELY = 8; | |
925 | Dygraph.THIRTY_MINUTELY = 9; | |
926 | Dygraph.HOURLY = 10; | |
927 | Dygraph.TWO_HOURLY = 11; | |
928 | Dygraph.SIX_HOURLY = 12; | |
929 | Dygraph.DAILY = 13; | |
930 | Dygraph.WEEKLY = 14; | |
931 | Dygraph.MONTHLY = 15; | |
932 | Dygraph.QUARTERLY = 16; | |
933 | Dygraph.BIANNUAL = 17; | |
934 | Dygraph.ANNUAL = 18; | |
935 | Dygraph.DECADAL = 19; | |
936 | Dygraph.NUM_GRANULARITIES = 20; | |
285a6bda DV |
937 | |
938 | Dygraph.SHORT_SPACINGS = []; | |
939 | Dygraph.SHORT_SPACINGS[Dygraph.SECONDLY] = 1000 * 1; | |
20a41c17 DV |
940 | Dygraph.SHORT_SPACINGS[Dygraph.TWO_SECONDLY] = 1000 * 2; |
941 | Dygraph.SHORT_SPACINGS[Dygraph.FIVE_SECONDLY] = 1000 * 5; | |
285a6bda DV |
942 | Dygraph.SHORT_SPACINGS[Dygraph.TEN_SECONDLY] = 1000 * 10; |
943 | Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_SECONDLY] = 1000 * 30; | |
944 | Dygraph.SHORT_SPACINGS[Dygraph.MINUTELY] = 1000 * 60; | |
20a41c17 DV |
945 | Dygraph.SHORT_SPACINGS[Dygraph.TWO_MINUTELY] = 1000 * 60 * 2; |
946 | Dygraph.SHORT_SPACINGS[Dygraph.FIVE_MINUTELY] = 1000 * 60 * 5; | |
285a6bda DV |
947 | Dygraph.SHORT_SPACINGS[Dygraph.TEN_MINUTELY] = 1000 * 60 * 10; |
948 | Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_MINUTELY] = 1000 * 60 * 30; | |
949 | Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600; | |
20a41c17 | 950 | Dygraph.SHORT_SPACINGS[Dygraph.TWO_HOURLY] = 1000 * 3600 * 2; |
805d5519 | 951 | Dygraph.SHORT_SPACINGS[Dygraph.SIX_HOURLY] = 1000 * 3600 * 6; |
285a6bda DV |
952 | Dygraph.SHORT_SPACINGS[Dygraph.DAILY] = 1000 * 86400; |
953 | Dygraph.SHORT_SPACINGS[Dygraph.WEEKLY] = 1000 * 604800; | |
32988383 DV |
954 | |
955 | // NumXTicks() | |
956 | // | |
957 | // If we used this time granularity, how many ticks would there be? | |
958 | // This is only an approximation, but it's generally good enough. | |
959 | // | |
285a6bda DV |
960 | Dygraph.prototype.NumXTicks = function(start_time, end_time, granularity) { |
961 | if (granularity < Dygraph.MONTHLY) { | |
32988383 | 962 | // Generate one tick mark for every fixed interval of time. |
285a6bda | 963 | var spacing = Dygraph.SHORT_SPACINGS[granularity]; |
32988383 DV |
964 | return Math.floor(0.5 + 1.0 * (end_time - start_time) / spacing); |
965 | } else { | |
966 | var year_mod = 1; // e.g. to only print one point every 10 years. | |
967 | var num_months = 12; | |
285a6bda DV |
968 | if (granularity == Dygraph.QUARTERLY) num_months = 3; |
969 | if (granularity == Dygraph.BIANNUAL) num_months = 2; | |
970 | if (granularity == Dygraph.ANNUAL) num_months = 1; | |
971 | if (granularity == Dygraph.DECADAL) { num_months = 1; year_mod = 10; } | |
32988383 DV |
972 | |
973 | var msInYear = 365.2524 * 24 * 3600 * 1000; | |
974 | var num_years = 1.0 * (end_time - start_time) / msInYear; | |
975 | return Math.floor(0.5 + 1.0 * num_years * num_months / year_mod); | |
976 | } | |
977 | }; | |
978 | ||
979 | // GetXAxis() | |
980 | // | |
981 | // Construct an x-axis of nicely-formatted times on meaningful boundaries | |
982 | // (e.g. 'Jan 09' rather than 'Jan 22, 2009'). | |
983 | // | |
984 | // Returns an array containing {v: millis, label: label} dictionaries. | |
985 | // | |
285a6bda | 986 | Dygraph.prototype.GetXAxis = function(start_time, end_time, granularity) { |
32988383 | 987 | var ticks = []; |
285a6bda | 988 | if (granularity < Dygraph.MONTHLY) { |
32988383 | 989 | // Generate one tick mark for every fixed interval of time. |
285a6bda | 990 | var spacing = Dygraph.SHORT_SPACINGS[granularity]; |
3d29302c | 991 | var format = '%d%b'; // e.g. "1Jan" |
076c9622 DV |
992 | |
993 | // Find a time less than start_time which occurs on a "nice" time boundary | |
994 | // for this granularity. | |
995 | var g = spacing / 1000; | |
076c9622 DV |
996 | var d = new Date(start_time); |
997 | if (g <= 60) { // seconds | |
998 | var x = d.getSeconds(); d.setSeconds(x - x % g); | |
999 | } else { | |
1000 | d.setSeconds(0); | |
1001 | g /= 60; | |
1002 | if (g <= 60) { // minutes | |
1003 | var x = d.getMinutes(); d.setMinutes(x - x % g); | |
1004 | } else { | |
1005 | d.setMinutes(0); | |
1006 | g /= 60; | |
1007 | ||
1008 | if (g <= 24) { // days | |
1009 | var x = d.getHours(); d.setHours(x - x % g); | |
1010 | } else { | |
1011 | d.setHours(0); | |
1012 | g /= 24; | |
1013 | ||
1014 | if (g == 7) { // one week | |
20a41c17 | 1015 | d.setDate(d.getDate() - d.getDay()); |
076c9622 DV |
1016 | } |
1017 | } | |
1018 | } | |
328bb812 | 1019 | } |
076c9622 DV |
1020 | start_time = d.getTime(); |
1021 | ||
32988383 DV |
1022 | for (var t = start_time; t <= end_time; t += spacing) { |
1023 | var d = new Date(t); | |
1024 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); | |
285a6bda | 1025 | if (frac == 0 || granularity >= Dygraph.DAILY) { |
32988383 DV |
1026 | // the extra hour covers DST problems. |
1027 | ticks.push({ v:t, label: new Date(t + 3600*1000).strftime(format) }); | |
1028 | } else { | |
1029 | ticks.push({ v:t, label: this.hmsString_(t) }); | |
1030 | } | |
1031 | } | |
1032 | } else { | |
1033 | // Display a tick mark on the first of a set of months of each year. | |
1034 | // Years get a tick mark iff y % year_mod == 0. This is useful for | |
1035 | // displaying a tick mark once every 10 years, say, on long time scales. | |
1036 | var months; | |
1037 | var year_mod = 1; // e.g. to only print one point every 10 years. | |
1038 | ||
285a6bda | 1039 | if (granularity == Dygraph.MONTHLY) { |
32988383 | 1040 | months = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ]; |
285a6bda | 1041 | } else if (granularity == Dygraph.QUARTERLY) { |
32988383 | 1042 | months = [ 0, 3, 6, 9 ]; |
285a6bda | 1043 | } else if (granularity == Dygraph.BIANNUAL) { |
32988383 | 1044 | months = [ 0, 6 ]; |
285a6bda | 1045 | } else if (granularity == Dygraph.ANNUAL) { |
32988383 | 1046 | months = [ 0 ]; |
285a6bda | 1047 | } else if (granularity == Dygraph.DECADAL) { |
32988383 DV |
1048 | months = [ 0 ]; |
1049 | year_mod = 10; | |
1050 | } | |
1051 | ||
1052 | var start_year = new Date(start_time).getFullYear(); | |
1053 | var end_year = new Date(end_time).getFullYear(); | |
285a6bda | 1054 | var zeropad = Dygraph.zeropad; |
32988383 DV |
1055 | for (var i = start_year; i <= end_year; i++) { |
1056 | if (i % year_mod != 0) continue; | |
1057 | for (var j = 0; j < months.length; j++) { | |
1058 | var date_str = i + "/" + zeropad(1 + months[j]) + "/01"; | |
1059 | var t = Date.parse(date_str); | |
1060 | if (t < start_time || t > end_time) continue; | |
1061 | ticks.push({ v:t, label: new Date(t).strftime('%b %y') }); | |
1062 | } | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | return ticks; | |
1067 | }; | |
1068 | ||
6a1aa64f DV |
1069 | |
1070 | /** | |
1071 | * Add ticks to the x-axis based on a date range. | |
1072 | * @param {Number} startDate Start of the date window (millis since epoch) | |
1073 | * @param {Number} endDate End of the date window (millis since epoch) | |
1074 | * @return {Array.<Object>} Array of {label, value} tuples. | |
1075 | * @public | |
1076 | */ | |
285a6bda | 1077 | Dygraph.dateTicker = function(startDate, endDate, self) { |
32988383 | 1078 | var chosen = -1; |
285a6bda DV |
1079 | for (var i = 0; i < Dygraph.NUM_GRANULARITIES; i++) { |
1080 | var num_ticks = self.NumXTicks(startDate, endDate, i); | |
1081 | if (self.width_ / num_ticks >= self.attr_('pixelsPerXLabel')) { | |
32988383 DV |
1082 | chosen = i; |
1083 | break; | |
2769de62 | 1084 | } |
6a1aa64f DV |
1085 | } |
1086 | ||
32988383 | 1087 | if (chosen >= 0) { |
285a6bda | 1088 | return self.GetXAxis(startDate, endDate, chosen); |
6a1aa64f | 1089 | } else { |
32988383 | 1090 | // TODO(danvk): signal error. |
6a1aa64f | 1091 | } |
6a1aa64f DV |
1092 | }; |
1093 | ||
1094 | /** | |
1095 | * Add ticks when the x axis has numbers on it (instead of dates) | |
1096 | * @param {Number} startDate Start of the date window (millis since epoch) | |
1097 | * @param {Number} endDate End of the date window (millis since epoch) | |
1098 | * @return {Array.<Object>} Array of {label, value} tuples. | |
1099 | * @public | |
1100 | */ | |
285a6bda | 1101 | Dygraph.numericTicks = function(minV, maxV, self) { |
c6336f04 DV |
1102 | // Basic idea: |
1103 | // Try labels every 1, 2, 5, 10, 20, 50, 100, etc. | |
1104 | // Calculate the resulting tick spacing (i.e. this.height_ / nTicks). | |
285a6bda | 1105 | // The first spacing greater than pixelsPerYLabel is what we use. |
ff00d3e2 | 1106 | // TODO(danvk): version that works on a log scale. |
f09e46d4 DV |
1107 | if (self.attr_("labelsKMG2")) { |
1108 | var mults = [1, 2, 4, 8]; | |
1109 | } else { | |
1110 | var mults = [1, 2, 5]; | |
1111 | } | |
c6336f04 | 1112 | var scale, low_val, high_val, nTicks; |
285a6bda DV |
1113 | // TODO(danvk): make it possible to set this for x- and y-axes independently. |
1114 | var pixelsPerTick = self.attr_('pixelsPerYLabel'); | |
c6336f04 | 1115 | for (var i = -10; i < 50; i++) { |
f09e46d4 DV |
1116 | if (self.attr_("labelsKMG2")) { |
1117 | var base_scale = Math.pow(16, i); | |
1118 | } else { | |
1119 | var base_scale = Math.pow(10, i); | |
1120 | } | |
c6336f04 DV |
1121 | for (var j = 0; j < mults.length; j++) { |
1122 | scale = base_scale * mults[j]; | |
c6336f04 DV |
1123 | low_val = Math.floor(minV / scale) * scale; |
1124 | high_val = Math.ceil(maxV / scale) * scale; | |
1125 | nTicks = (high_val - low_val) / scale; | |
285a6bda | 1126 | var spacing = self.height_ / nTicks; |
c6336f04 | 1127 | // wish I could break out of both loops at once... |
285a6bda | 1128 | if (spacing > pixelsPerTick) break; |
c6336f04 | 1129 | } |
285a6bda | 1130 | if (spacing > pixelsPerTick) break; |
6a1aa64f DV |
1131 | } |
1132 | ||
1133 | // Construct labels for the ticks | |
1134 | var ticks = []; | |
ed11be50 DV |
1135 | var k; |
1136 | var k_labels = []; | |
1137 | if (self.attr_("labelsKMB")) { | |
1138 | k = 1000; | |
1139 | k_labels = [ "K", "M", "B", "T" ]; | |
1140 | } | |
1141 | if (self.attr_("labelsKMG2")) { | |
1142 | if (k) self.warn("Setting both labelsKMB and labelsKMG2. Pick one!"); | |
1143 | k = 1024; | |
1144 | k_labels = [ "k", "M", "G", "T" ]; | |
1145 | } | |
1146 | ||
c6336f04 DV |
1147 | for (var i = 0; i < nTicks; i++) { |
1148 | var tickV = low_val + i * scale; | |
0af6e346 | 1149 | var absTickV = Math.abs(tickV); |
285a6bda | 1150 | var label = self.round_(tickV, 2); |
ed11be50 DV |
1151 | if (k_labels.length) { |
1152 | // Round up to an appropriate unit. | |
1153 | var n = k*k*k*k; | |
1154 | for (var j = 3; j >= 0; j--, n /= k) { | |
1155 | if (absTickV >= n) { | |
1156 | label = self.round_(tickV / n, 1) + k_labels[j]; | |
1157 | break; | |
1158 | } | |
afefbcdb | 1159 | } |
6a1aa64f DV |
1160 | } |
1161 | ticks.push( {label: label, v: tickV} ); | |
1162 | } | |
1163 | return ticks; | |
1164 | }; | |
1165 | ||
1166 | /** | |
1167 | * Adds appropriate ticks on the y-axis | |
1168 | * @param {Number} minY The minimum Y value in the data set | |
1169 | * @param {Number} maxY The maximum Y value in the data set | |
1170 | * @private | |
1171 | */ | |
285a6bda | 1172 | Dygraph.prototype.addYTicks_ = function(minY, maxY) { |
6a1aa64f | 1173 | // Set the number of ticks so that the labels are human-friendly. |
285a6bda DV |
1174 | // TODO(danvk): make this an attribute as well. |
1175 | var ticks = Dygraph.numericTicks(minY, maxY, this); | |
6a1aa64f DV |
1176 | this.layout_.updateOptions( { yAxis: [minY, maxY], |
1177 | yTicks: ticks } ); | |
1178 | }; | |
1179 | ||
5011e7a1 DV |
1180 | // Computes the range of the data series (including confidence intervals). |
1181 | // series is either [ [x1, y1], [x2, y2], ... ] or | |
1182 | // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ... | |
1183 | // Returns [low, high] | |
1184 | Dygraph.prototype.extremeValues_ = function(series) { | |
1185 | var minY = null, maxY = null; | |
1186 | ||
9922b78b | 1187 | var bars = this.attr_("errorBars") || this.attr_("customBars"); |
5011e7a1 DV |
1188 | if (bars) { |
1189 | // With custom bars, maxY is the max of the high values. | |
1190 | for (var j = 0; j < series.length; j++) { | |
1191 | var y = series[j][1][0]; | |
1192 | if (!y) continue; | |
1193 | var low = y - series[j][1][1]; | |
1194 | var high = y + series[j][1][2]; | |
1195 | if (low > y) low = y; // this can happen with custom bars, | |
1196 | if (high < y) high = y; // e.g. in tests/custom-bars.html | |
1197 | if (maxY == null || high > maxY) { | |
1198 | maxY = high; | |
1199 | } | |
1200 | if (minY == null || low < minY) { | |
1201 | minY = low; | |
1202 | } | |
1203 | } | |
1204 | } else { | |
1205 | for (var j = 0; j < series.length; j++) { | |
1206 | var y = series[j][1]; | |
d12999d3 | 1207 | if (y === null || isNaN(y)) continue; |
5011e7a1 DV |
1208 | if (maxY == null || y > maxY) { |
1209 | maxY = y; | |
1210 | } | |
1211 | if (minY == null || y < minY) { | |
1212 | minY = y; | |
1213 | } | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | return [minY, maxY]; | |
1218 | }; | |
1219 | ||
6a1aa64f DV |
1220 | /** |
1221 | * Update the graph with new data. Data is in the format | |
1222 | * [ [date1, val1, val2, ...], [date2, val1, val2, ...] if errorBars=false | |
1223 | * or, if errorBars=true, | |
1224 | * [ [date1, [val1,stddev1], [val2,stddev2], ...], [date2, ...], ...] | |
1225 | * @param {Array.<Object>} data The data (see above) | |
1226 | * @private | |
1227 | */ | |
285a6bda | 1228 | Dygraph.prototype.drawGraph_ = function(data) { |
3bd9c228 | 1229 | var minY = null, maxY = null; |
6a1aa64f | 1230 | this.layout_.removeAllDatasets(); |
285a6bda | 1231 | this.setColors_(); |
9317362d | 1232 | this.attrs_['pointSize'] = 0.5 * this.attr_('highlightCircleSize'); |
285a6bda | 1233 | |
6a1aa64f DV |
1234 | // Loop over all fields in the dataset |
1235 | for (var i = 1; i < data[0].length; i++) { | |
1cf11047 DV |
1236 | if (!this.visibility()[i - 1]) continue; |
1237 | ||
6a1aa64f DV |
1238 | var series = []; |
1239 | for (var j = 0; j < data.length; j++) { | |
1240 | var date = data[j][0]; | |
1241 | series[j] = [date, data[j][i]]; | |
1242 | } | |
1243 | series = this.rollingAverage(series, this.rollPeriod_); | |
1244 | ||
1245 | // Prune down to the desired range, if necessary (for zooming) | |
9922b78b | 1246 | var bars = this.attr_("errorBars") || this.attr_("customBars"); |
6a1aa64f DV |
1247 | if (this.dateWindow_) { |
1248 | var low = this.dateWindow_[0]; | |
1249 | var high= this.dateWindow_[1]; | |
1250 | var pruned = []; | |
1251 | for (var k = 0; k < series.length; k++) { | |
1252 | if (series[k][0] >= low && series[k][0] <= high) { | |
1253 | pruned.push(series[k]); | |
6a1aa64f DV |
1254 | } |
1255 | } | |
1256 | series = pruned; | |
6a1aa64f DV |
1257 | } |
1258 | ||
648acd28 DV |
1259 | var extremes = this.extremeValues_(series); |
1260 | var thisMinY = extremes[0]; | |
1261 | var thisMaxY = extremes[1]; | |
5011e7a1 DV |
1262 | if (!minY || thisMinY < minY) minY = thisMinY; |
1263 | if (!maxY || thisMaxY > maxY) maxY = thisMaxY; | |
1264 | ||
6a1aa64f DV |
1265 | if (bars) { |
1266 | var vals = []; | |
1267 | for (var j=0; j<series.length; j++) | |
1268 | vals[j] = [series[j][0], | |
1269 | series[j][1][0], series[j][1][1], series[j][1][2]]; | |
285a6bda | 1270 | this.layout_.addDataset(this.attr_("labels")[i], vals); |
6a1aa64f | 1271 | } else { |
285a6bda | 1272 | this.layout_.addDataset(this.attr_("labels")[i], series); |
6a1aa64f DV |
1273 | } |
1274 | } | |
1275 | ||
1276 | // Use some heuristics to come up with a good maxY value, unless it's been | |
1277 | // set explicitly by the user. | |
1278 | if (this.valueRange_ != null) { | |
1279 | this.addYTicks_(this.valueRange_[0], this.valueRange_[1]); | |
1280 | } else { | |
1281 | // Add some padding and round up to an integer to be human-friendly. | |
3bd9c228 DV |
1282 | var span = maxY - minY; |
1283 | var maxAxisY = maxY + 0.1 * span; | |
1284 | var minAxisY = minY - 0.1 * span; | |
1285 | ||
1286 | // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense. | |
ceb009dd DV |
1287 | if (minAxisY < 0 && minY >= 0) minAxisY = 0; |
1288 | if (maxAxisY > 0 && maxY <= 0) maxAxisY = 0; | |
3bd9c228 DV |
1289 | |
1290 | if (this.attr_("includeZero")) { | |
1291 | if (maxY < 0) maxAxisY = 0; | |
1292 | if (minY > 0) minAxisY = 0; | |
1293 | } | |
1294 | ||
1295 | this.addYTicks_(minAxisY, maxAxisY); | |
6a1aa64f DV |
1296 | } |
1297 | ||
1298 | this.addXTicks_(); | |
1299 | ||
1300 | // Tell PlotKit to use this new data and render itself | |
d033ae1c | 1301 | this.layout_.updateOptions({dateWindow: this.dateWindow_}); |
6a1aa64f DV |
1302 | this.layout_.evaluateWithError(); |
1303 | this.plotter_.clear(); | |
1304 | this.plotter_.render(); | |
f6401bf6 DV |
1305 | this.canvas_.getContext('2d').clearRect(0, 0, this.canvas_.width, |
1306 | this.canvas_.height); | |
6a1aa64f DV |
1307 | }; |
1308 | ||
1309 | /** | |
1310 | * Calculates the rolling average of a data set. | |
1311 | * If originalData is [label, val], rolls the average of those. | |
1312 | * If originalData is [label, [, it's interpreted as [value, stddev] | |
1313 | * and the roll is returned in the same form, with appropriately reduced | |
1314 | * stddev for each value. | |
1315 | * Note that this is where fractional input (i.e. '5/10') is converted into | |
1316 | * decimal values. | |
1317 | * @param {Array} originalData The data in the appropriate format (see above) | |
1318 | * @param {Number} rollPeriod The number of days over which to average the data | |
1319 | */ | |
285a6bda | 1320 | Dygraph.prototype.rollingAverage = function(originalData, rollPeriod) { |
6a1aa64f DV |
1321 | if (originalData.length < 2) |
1322 | return originalData; | |
1323 | var rollPeriod = Math.min(rollPeriod, originalData.length - 1); | |
1324 | var rollingData = []; | |
285a6bda | 1325 | var sigma = this.attr_("sigma"); |
6a1aa64f DV |
1326 | |
1327 | if (this.fractions_) { | |
1328 | var num = 0; | |
1329 | var den = 0; // numerator/denominator | |
1330 | var mult = 100.0; | |
1331 | for (var i = 0; i < originalData.length; i++) { | |
1332 | num += originalData[i][1][0]; | |
1333 | den += originalData[i][1][1]; | |
1334 | if (i - rollPeriod >= 0) { | |
1335 | num -= originalData[i - rollPeriod][1][0]; | |
1336 | den -= originalData[i - rollPeriod][1][1]; | |
1337 | } | |
1338 | ||
1339 | var date = originalData[i][0]; | |
1340 | var value = den ? num / den : 0.0; | |
285a6bda | 1341 | if (this.attr_("errorBars")) { |
6a1aa64f DV |
1342 | if (this.wilsonInterval_) { |
1343 | // For more details on this confidence interval, see: | |
1344 | // http://en.wikipedia.org/wiki/Binomial_confidence_interval | |
1345 | if (den) { | |
1346 | var p = value < 0 ? 0 : value, n = den; | |
1347 | var pm = sigma * Math.sqrt(p*(1-p)/n + sigma*sigma/(4*n*n)); | |
1348 | var denom = 1 + sigma * sigma / den; | |
1349 | var low = (p + sigma * sigma / (2 * den) - pm) / denom; | |
1350 | var high = (p + sigma * sigma / (2 * den) + pm) / denom; | |
1351 | rollingData[i] = [date, | |
1352 | [p * mult, (p - low) * mult, (high - p) * mult]]; | |
1353 | } else { | |
1354 | rollingData[i] = [date, [0, 0, 0]]; | |
1355 | } | |
1356 | } else { | |
1357 | var stddev = den ? sigma * Math.sqrt(value * (1 - value) / den) : 1.0; | |
1358 | rollingData[i] = [date, [mult * value, mult * stddev, mult * stddev]]; | |
1359 | } | |
1360 | } else { | |
1361 | rollingData[i] = [date, mult * value]; | |
1362 | } | |
1363 | } | |
9922b78b | 1364 | } else if (this.attr_("customBars")) { |
f6885d6a DV |
1365 | var low = 0; |
1366 | var mid = 0; | |
1367 | var high = 0; | |
1368 | var count = 0; | |
6a1aa64f DV |
1369 | for (var i = 0; i < originalData.length; i++) { |
1370 | var data = originalData[i][1]; | |
1371 | var y = data[1]; | |
1372 | rollingData[i] = [originalData[i][0], [y, y - data[0], data[2] - y]]; | |
f6885d6a | 1373 | |
8b91c51f | 1374 | if (y != null && !isNaN(y)) { |
49a7d0d5 DV |
1375 | low += data[0]; |
1376 | mid += y; | |
1377 | high += data[2]; | |
1378 | count += 1; | |
1379 | } | |
f6885d6a DV |
1380 | if (i - rollPeriod >= 0) { |
1381 | var prev = originalData[i - rollPeriod]; | |
8b91c51f | 1382 | if (prev[1][1] != null && !isNaN(prev[1][1])) { |
49a7d0d5 DV |
1383 | low -= prev[1][0]; |
1384 | mid -= prev[1][1]; | |
1385 | high -= prev[1][2]; | |
1386 | count -= 1; | |
1387 | } | |
f6885d6a DV |
1388 | } |
1389 | rollingData[i] = [originalData[i][0], [ 1.0 * mid / count, | |
1390 | 1.0 * (mid - low) / count, | |
1391 | 1.0 * (high - mid) / count ]]; | |
2769de62 | 1392 | } |
6a1aa64f DV |
1393 | } else { |
1394 | // Calculate the rolling average for the first rollPeriod - 1 points where | |
1395 | // there is not enough data to roll over the full number of days | |
1396 | var num_init_points = Math.min(rollPeriod - 1, originalData.length - 2); | |
285a6bda | 1397 | if (!this.attr_("errorBars")){ |
5011e7a1 DV |
1398 | if (rollPeriod == 1) { |
1399 | return originalData; | |
1400 | } | |
1401 | ||
2847c1cf | 1402 | for (var i = 0; i < originalData.length; i++) { |
6a1aa64f | 1403 | var sum = 0; |
5011e7a1 | 1404 | var num_ok = 0; |
2847c1cf DV |
1405 | for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) { |
1406 | var y = originalData[j][1]; | |
8b91c51f | 1407 | if (y == null || isNaN(y)) continue; |
5011e7a1 | 1408 | num_ok++; |
2847c1cf | 1409 | sum += originalData[j][1]; |
6a1aa64f | 1410 | } |
5011e7a1 | 1411 | if (num_ok) { |
2847c1cf | 1412 | rollingData[i] = [originalData[i][0], sum / num_ok]; |
5011e7a1 | 1413 | } else { |
2847c1cf | 1414 | rollingData[i] = [originalData[i][0], null]; |
5011e7a1 | 1415 | } |
6a1aa64f | 1416 | } |
2847c1cf DV |
1417 | |
1418 | } else { | |
1419 | for (var i = 0; i < originalData.length; i++) { | |
6a1aa64f DV |
1420 | var sum = 0; |
1421 | var variance = 0; | |
5011e7a1 | 1422 | var num_ok = 0; |
2847c1cf | 1423 | for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) { |
5011e7a1 | 1424 | var y = originalData[j][1][0]; |
8b91c51f | 1425 | if (y == null || isNaN(y)) continue; |
5011e7a1 | 1426 | num_ok++; |
6a1aa64f DV |
1427 | sum += originalData[j][1][0]; |
1428 | variance += Math.pow(originalData[j][1][1], 2); | |
1429 | } | |
5011e7a1 DV |
1430 | if (num_ok) { |
1431 | var stddev = Math.sqrt(variance) / num_ok; | |
1432 | rollingData[i] = [originalData[i][0], | |
1433 | [sum / num_ok, sigma * stddev, sigma * stddev]]; | |
1434 | } else { | |
1435 | rollingData[i] = [originalData[i][0], [null, null, null]]; | |
1436 | } | |
6a1aa64f DV |
1437 | } |
1438 | } | |
1439 | } | |
1440 | ||
1441 | return rollingData; | |
1442 | }; | |
1443 | ||
1444 | /** | |
1445 | * Parses a date, returning the number of milliseconds since epoch. This can be | |
285a6bda DV |
1446 | * passed in as an xValueParser in the Dygraph constructor. |
1447 | * TODO(danvk): enumerate formats that this understands. | |
6a1aa64f DV |
1448 | * @param {String} A date in YYYYMMDD format. |
1449 | * @return {Number} Milliseconds since epoch. | |
1450 | * @public | |
1451 | */ | |
285a6bda | 1452 | Dygraph.dateParser = function(dateStr, self) { |
6a1aa64f | 1453 | var dateStrSlashed; |
285a6bda | 1454 | var d; |
2769de62 | 1455 | if (dateStr.length == 10 && dateStr.search("-") != -1) { // e.g. '2009-07-12' |
6a1aa64f | 1456 | dateStrSlashed = dateStr.replace("-", "/", "g"); |
353a0294 DV |
1457 | while (dateStrSlashed.search("-") != -1) { |
1458 | dateStrSlashed = dateStrSlashed.replace("-", "/"); | |
1459 | } | |
285a6bda | 1460 | d = Date.parse(dateStrSlashed); |
2769de62 | 1461 | } else if (dateStr.length == 8) { // e.g. '20090712' |
285a6bda | 1462 | // TODO(danvk): remove support for this format. It's confusing. |
6a1aa64f DV |
1463 | dateStrSlashed = dateStr.substr(0,4) + "/" + dateStr.substr(4,2) |
1464 | + "/" + dateStr.substr(6,2); | |
285a6bda | 1465 | d = Date.parse(dateStrSlashed); |
2769de62 DV |
1466 | } else { |
1467 | // Any format that Date.parse will accept, e.g. "2009/07/12" or | |
1468 | // "2009/07/12 12:34:56" | |
285a6bda DV |
1469 | d = Date.parse(dateStr); |
1470 | } | |
1471 | ||
1472 | if (!d || isNaN(d)) { | |
1473 | self.error("Couldn't parse " + dateStr + " as a date"); | |
1474 | } | |
1475 | return d; | |
1476 | }; | |
1477 | ||
1478 | /** | |
1479 | * Detects the type of the str (date or numeric) and sets the various | |
1480 | * formatting attributes in this.attrs_ based on this type. | |
1481 | * @param {String} str An x value. | |
1482 | * @private | |
1483 | */ | |
1484 | Dygraph.prototype.detectTypeFromString_ = function(str) { | |
1485 | var isDate = false; | |
1486 | if (str.indexOf('-') >= 0 || | |
1487 | str.indexOf('/') >= 0 || | |
1488 | isNaN(parseFloat(str))) { | |
1489 | isDate = true; | |
1490 | } else if (str.length == 8 && str > '19700101' && str < '20371231') { | |
1491 | // TODO(danvk): remove support for this format. | |
1492 | isDate = true; | |
1493 | } | |
1494 | ||
1495 | if (isDate) { | |
1496 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1497 | this.attrs_.xValueParser = Dygraph.dateParser; | |
1498 | this.attrs_.xTicker = Dygraph.dateTicker; | |
1499 | } else { | |
1500 | this.attrs_.xValueFormatter = function(x) { return x; }; | |
1501 | this.attrs_.xValueParser = function(x) { return parseFloat(x); }; | |
1502 | this.attrs_.xTicker = Dygraph.numericTicks; | |
6a1aa64f | 1503 | } |
6a1aa64f DV |
1504 | }; |
1505 | ||
1506 | /** | |
1507 | * Parses a string in a special csv format. We expect a csv file where each | |
1508 | * line is a date point, and the first field in each line is the date string. | |
1509 | * We also expect that all remaining fields represent series. | |
285a6bda | 1510 | * if the errorBars attribute is set, then interpret the fields as: |
6a1aa64f DV |
1511 | * date, series1, stddev1, series2, stddev2, ... |
1512 | * @param {Array.<Object>} data See above. | |
1513 | * @private | |
285a6bda DV |
1514 | * |
1515 | * @return Array.<Object> An array with one entry for each row. These entries | |
1516 | * are an array of cells in that row. The first entry is the parsed x-value for | |
1517 | * the row. The second, third, etc. are the y-values. These can take on one of | |
1518 | * three forms, depending on the CSV and constructor parameters: | |
1519 | * 1. numeric value | |
1520 | * 2. [ value, stddev ] | |
1521 | * 3. [ low value, center value, high value ] | |
6a1aa64f | 1522 | */ |
285a6bda | 1523 | Dygraph.prototype.parseCSV_ = function(data) { |
6a1aa64f DV |
1524 | var ret = []; |
1525 | var lines = data.split("\n"); | |
3d67f03b DV |
1526 | |
1527 | // Use the default delimiter or fall back to a tab if that makes sense. | |
1528 | var delim = this.attr_('delimiter'); | |
1529 | if (lines[0].indexOf(delim) == -1 && lines[0].indexOf('\t') >= 0) { | |
1530 | delim = '\t'; | |
1531 | } | |
1532 | ||
285a6bda | 1533 | var start = 0; |
6a1aa64f | 1534 | if (this.labelsFromCSV_) { |
285a6bda | 1535 | start = 1; |
3d67f03b | 1536 | this.attrs_.labels = lines[0].split(delim); |
6a1aa64f DV |
1537 | } |
1538 | ||
285a6bda DV |
1539 | var xParser; |
1540 | var defaultParserSet = false; // attempt to auto-detect x value type | |
1541 | var expectedCols = this.attr_("labels").length; | |
6a1aa64f DV |
1542 | for (var i = start; i < lines.length; i++) { |
1543 | var line = lines[i]; | |
1544 | if (line.length == 0) continue; // skip blank lines | |
3d67f03b DV |
1545 | if (line[0] == '#') continue; // skip comment lines |
1546 | var inFields = line.split(delim); | |
285a6bda | 1547 | if (inFields.length < 2) continue; |
6a1aa64f DV |
1548 | |
1549 | var fields = []; | |
285a6bda DV |
1550 | if (!defaultParserSet) { |
1551 | this.detectTypeFromString_(inFields[0]); | |
1552 | xParser = this.attr_("xValueParser"); | |
1553 | defaultParserSet = true; | |
1554 | } | |
1555 | fields[0] = xParser(inFields[0], this); | |
6a1aa64f DV |
1556 | |
1557 | // If fractions are expected, parse the numbers as "A/B" | |
1558 | if (this.fractions_) { | |
1559 | for (var j = 1; j < inFields.length; j++) { | |
1560 | // TODO(danvk): figure out an appropriate way to flag parse errors. | |
1561 | var vals = inFields[j].split("/"); | |
1562 | fields[j] = [parseFloat(vals[0]), parseFloat(vals[1])]; | |
1563 | } | |
285a6bda | 1564 | } else if (this.attr_("errorBars")) { |
6a1aa64f DV |
1565 | // If there are error bars, values are (value, stddev) pairs |
1566 | for (var j = 1; j < inFields.length; j += 2) | |
1567 | fields[(j + 1) / 2] = [parseFloat(inFields[j]), | |
1568 | parseFloat(inFields[j + 1])]; | |
9922b78b | 1569 | } else if (this.attr_("customBars")) { |
6a1aa64f DV |
1570 | // Bars are a low;center;high tuple |
1571 | for (var j = 1; j < inFields.length; j++) { | |
1572 | var vals = inFields[j].split(";"); | |
1573 | fields[j] = [ parseFloat(vals[0]), | |
1574 | parseFloat(vals[1]), | |
1575 | parseFloat(vals[2]) ]; | |
1576 | } | |
1577 | } else { | |
1578 | // Values are just numbers | |
285a6bda | 1579 | for (var j = 1; j < inFields.length; j++) { |
6a1aa64f | 1580 | fields[j] = parseFloat(inFields[j]); |
285a6bda | 1581 | } |
6a1aa64f DV |
1582 | } |
1583 | ret.push(fields); | |
285a6bda DV |
1584 | |
1585 | if (fields.length != expectedCols) { | |
1586 | this.error("Number of columns in line " + i + " (" + fields.length + | |
1587 | ") does not agree with number of labels (" + expectedCols + | |
1588 | ") " + line); | |
1589 | } | |
6a1aa64f DV |
1590 | } |
1591 | return ret; | |
1592 | }; | |
1593 | ||
1594 | /** | |
285a6bda DV |
1595 | * The user has provided their data as a pre-packaged JS array. If the x values |
1596 | * are numeric, this is the same as dygraphs' internal format. If the x values | |
1597 | * are dates, we need to convert them from Date objects to ms since epoch. | |
1598 | * @param {Array.<Object>} data | |
1599 | * @return {Array.<Object>} data with numeric x values. | |
1600 | */ | |
1601 | Dygraph.prototype.parseArray_ = function(data) { | |
1602 | // Peek at the first x value to see if it's numeric. | |
1603 | if (data.length == 0) { | |
1604 | this.error("Can't plot empty data set"); | |
1605 | return null; | |
1606 | } | |
1607 | if (data[0].length == 0) { | |
1608 | this.error("Data set cannot contain an empty row"); | |
1609 | return null; | |
1610 | } | |
1611 | ||
1612 | if (this.attr_("labels") == null) { | |
1613 | this.warn("Using default labels. Set labels explicitly via 'labels' " + | |
1614 | "in the options parameter"); | |
1615 | this.attrs_.labels = [ "X" ]; | |
1616 | for (var i = 1; i < data[0].length; i++) { | |
1617 | this.attrs_.labels.push("Y" + i); | |
1618 | } | |
1619 | } | |
1620 | ||
2dda3850 | 1621 | if (Dygraph.isDateLike(data[0][0])) { |
285a6bda DV |
1622 | // Some intelligent defaults for a date x-axis. |
1623 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1624 | this.attrs_.xTicker = Dygraph.dateTicker; | |
1625 | ||
1626 | // Assume they're all dates. | |
e3ab7b40 | 1627 | var parsedData = Dygraph.clone(data); |
285a6bda DV |
1628 | for (var i = 0; i < data.length; i++) { |
1629 | if (parsedData[i].length == 0) { | |
1630 | this.error("Row " << (1 + i) << " of data is empty"); | |
1631 | return null; | |
1632 | } | |
1633 | if (parsedData[i][0] == null | |
1634 | || typeof(parsedData[i][0].getTime) != 'function') { | |
1635 | this.error("x value in row " << (1 + i) << " is not a Date"); | |
1636 | return null; | |
1637 | } | |
1638 | parsedData[i][0] = parsedData[i][0].getTime(); | |
1639 | } | |
1640 | return parsedData; | |
1641 | } else { | |
1642 | // Some intelligent defaults for a numeric x-axis. | |
1643 | this.attrs_.xValueFormatter = function(x) { return x; }; | |
1644 | this.attrs_.xTicker = Dygraph.numericTicks; | |
1645 | return data; | |
1646 | } | |
1647 | }; | |
1648 | ||
1649 | /** | |
79420a1e DV |
1650 | * Parses a DataTable object from gviz. |
1651 | * The data is expected to have a first column that is either a date or a | |
1652 | * number. All subsequent columns must be numbers. If there is a clear mismatch | |
1653 | * between this.xValueParser_ and the type of the first column, it will be | |
1654 | * fixed. Returned value is in the same format as return value of parseCSV_. | |
1655 | * @param {Array.<Object>} data See above. | |
1656 | * @private | |
1657 | */ | |
285a6bda | 1658 | Dygraph.prototype.parseDataTable_ = function(data) { |
79420a1e DV |
1659 | var cols = data.getNumberOfColumns(); |
1660 | var rows = data.getNumberOfRows(); | |
1661 | ||
1662 | // Read column labels | |
1663 | var labels = []; | |
1664 | for (var i = 0; i < cols; i++) { | |
1665 | labels.push(data.getColumnLabel(i)); | |
3e3f84e4 | 1666 | if (i != 0 && this.attr_("errorBars")) i += 1; |
79420a1e | 1667 | } |
285a6bda | 1668 | this.attrs_.labels = labels; |
3e3f84e4 | 1669 | cols = labels.length; |
79420a1e | 1670 | |
d955e223 | 1671 | var indepType = data.getColumnType(0); |
285a6bda DV |
1672 | if (indepType == 'date') { |
1673 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1674 | this.attrs_.xValueParser = Dygraph.dateParser; | |
1675 | this.attrs_.xTicker = Dygraph.dateTicker; | |
33127159 | 1676 | } else if (indepType == 'number') { |
285a6bda DV |
1677 | this.attrs_.xValueFormatter = function(x) { return x; }; |
1678 | this.attrs_.xValueParser = function(x) { return parseFloat(x); }; | |
1679 | this.attrs_.xTicker = Dygraph.numericTicks; | |
1680 | } else { | |
33127159 | 1681 | this.error("only 'date' and 'number' types are supported for column 1 " + |
285a6bda | 1682 | "of DataTable input (Got '" + indepType + "')"); |
79420a1e DV |
1683 | return null; |
1684 | } | |
1685 | ||
1686 | var ret = []; | |
1687 | for (var i = 0; i < rows; i++) { | |
1688 | var row = []; | |
debe4434 DV |
1689 | if (typeof(data.getValue(i, 0)) === 'undefined' || |
1690 | data.getValue(i, 0) === null) { | |
1691 | this.warning("Ignoring row " + i + | |
1692 | " of DataTable because of undefined or null first column."); | |
1693 | continue; | |
1694 | } | |
1695 | ||
d955e223 DV |
1696 | if (indepType == 'date') { |
1697 | row.push(data.getValue(i, 0).getTime()); | |
1698 | } else { | |
1699 | row.push(data.getValue(i, 0)); | |
1700 | } | |
3e3f84e4 DV |
1701 | if (!this.attr_("errorBars")) { |
1702 | for (var j = 1; j < cols; j++) { | |
1703 | row.push(data.getValue(i, j)); | |
1704 | } | |
1705 | } else { | |
1706 | for (var j = 0; j < cols - 1; j++) { | |
1707 | row.push([ data.getValue(i, 1 + 2 * j), data.getValue(i, 2 + 2 * j) ]); | |
1708 | } | |
79420a1e | 1709 | } |
243d96e8 | 1710 | ret.push(row); |
79420a1e DV |
1711 | } |
1712 | return ret; | |
1713 | } | |
1714 | ||
24e5350c | 1715 | // These functions are all based on MochiKit. |
fc80a396 DV |
1716 | Dygraph.update = function (self, o) { |
1717 | if (typeof(o) != 'undefined' && o !== null) { | |
1718 | for (var k in o) { | |
85b99f0b DV |
1719 | if (o.hasOwnProperty(k)) { |
1720 | self[k] = o[k]; | |
1721 | } | |
fc80a396 DV |
1722 | } |
1723 | } | |
1724 | return self; | |
1725 | }; | |
1726 | ||
2dda3850 DV |
1727 | Dygraph.isArrayLike = function (o) { |
1728 | var typ = typeof(o); | |
1729 | if ( | |
1730 | (typ != 'object' && !(typ == 'function' && | |
1731 | typeof(o.item) == 'function')) || | |
1732 | o === null || | |
1733 | typeof(o.length) != 'number' || | |
1734 | o.nodeType === 3 | |
1735 | ) { | |
1736 | return false; | |
1737 | } | |
1738 | return true; | |
1739 | }; | |
1740 | ||
1741 | Dygraph.isDateLike = function (o) { | |
1742 | if (typeof(o) != "object" || o === null || | |
1743 | typeof(o.getTime) != 'function') { | |
1744 | return false; | |
1745 | } | |
1746 | return true; | |
1747 | }; | |
1748 | ||
e3ab7b40 DV |
1749 | Dygraph.clone = function(o) { |
1750 | // TODO(danvk): figure out how MochiKit's version works | |
1751 | var r = []; | |
1752 | for (var i = 0; i < o.length; i++) { | |
1753 | if (Dygraph.isArrayLike(o[i])) { | |
1754 | r.push(Dygraph.clone(o[i])); | |
1755 | } else { | |
1756 | r.push(o[i]); | |
1757 | } | |
1758 | } | |
1759 | return r; | |
24e5350c DV |
1760 | }; |
1761 | ||
2dda3850 | 1762 | |
79420a1e | 1763 | /** |
6a1aa64f DV |
1764 | * Get the CSV data. If it's in a function, call that function. If it's in a |
1765 | * file, do an XMLHttpRequest to get it. | |
1766 | * @private | |
1767 | */ | |
285a6bda | 1768 | Dygraph.prototype.start_ = function() { |
6a1aa64f | 1769 | if (typeof this.file_ == 'function') { |
285a6bda | 1770 | // CSV string. Pretend we got it via XHR. |
6a1aa64f | 1771 | this.loadedEvent_(this.file_()); |
2dda3850 | 1772 | } else if (Dygraph.isArrayLike(this.file_)) { |
285a6bda DV |
1773 | this.rawData_ = this.parseArray_(this.file_); |
1774 | this.drawGraph_(this.rawData_); | |
79420a1e DV |
1775 | } else if (typeof this.file_ == 'object' && |
1776 | typeof this.file_.getColumnRange == 'function') { | |
1777 | // must be a DataTable from gviz. | |
1778 | this.rawData_ = this.parseDataTable_(this.file_); | |
1779 | this.drawGraph_(this.rawData_); | |
285a6bda DV |
1780 | } else if (typeof this.file_ == 'string') { |
1781 | // Heuristic: a newline means it's CSV data. Otherwise it's an URL. | |
1782 | if (this.file_.indexOf('\n') >= 0) { | |
1783 | this.loadedEvent_(this.file_); | |
1784 | } else { | |
1785 | var req = new XMLHttpRequest(); | |
1786 | var caller = this; | |
1787 | req.onreadystatechange = function () { | |
1788 | if (req.readyState == 4) { | |
1789 | if (req.status == 200) { | |
1790 | caller.loadedEvent_(req.responseText); | |
1791 | } | |
6a1aa64f | 1792 | } |
285a6bda | 1793 | }; |
6a1aa64f | 1794 | |
285a6bda DV |
1795 | req.open("GET", this.file_, true); |
1796 | req.send(null); | |
1797 | } | |
1798 | } else { | |
1799 | this.error("Unknown data format: " + (typeof this.file_)); | |
6a1aa64f DV |
1800 | } |
1801 | }; | |
1802 | ||
1803 | /** | |
1804 | * Changes various properties of the graph. These can include: | |
1805 | * <ul> | |
1806 | * <li>file: changes the source data for the graph</li> | |
1807 | * <li>errorBars: changes whether the data contains stddev</li> | |
1808 | * </ul> | |
1809 | * @param {Object} attrs The new properties and values | |
1810 | */ | |
285a6bda DV |
1811 | Dygraph.prototype.updateOptions = function(attrs) { |
1812 | // TODO(danvk): this is a mess. Rethink this function. | |
6a1aa64f DV |
1813 | if (attrs.rollPeriod) { |
1814 | this.rollPeriod_ = attrs.rollPeriod; | |
1815 | } | |
1816 | if (attrs.dateWindow) { | |
1817 | this.dateWindow_ = attrs.dateWindow; | |
1818 | } | |
1819 | if (attrs.valueRange) { | |
1820 | this.valueRange_ = attrs.valueRange; | |
1821 | } | |
fc80a396 | 1822 | Dygraph.update(this.user_attrs_, attrs); |
285a6bda DV |
1823 | |
1824 | this.labelsFromCSV_ = (this.attr_("labels") == null); | |
1825 | ||
1826 | // TODO(danvk): this doesn't match the constructor logic | |
1827 | this.layout_.updateOptions({ 'errorBars': this.attr_("errorBars") }); | |
6a1aa64f DV |
1828 | if (attrs['file'] && attrs['file'] != this.file_) { |
1829 | this.file_ = attrs['file']; | |
1830 | this.start_(); | |
1831 | } else { | |
1832 | this.drawGraph_(this.rawData_); | |
1833 | } | |
1834 | }; | |
1835 | ||
1836 | /** | |
697e70b2 DV |
1837 | * Resizes the dygraph. If no parameters are specified, resizes to fill the |
1838 | * containing div (which has presumably changed size since the dygraph was | |
1839 | * instantiated. If the width/height are specified, the div will be resized. | |
964f30c6 DV |
1840 | * |
1841 | * This is far more efficient than destroying and re-instantiating a | |
1842 | * Dygraph, since it doesn't have to reparse the underlying data. | |
1843 | * | |
697e70b2 DV |
1844 | * @param {Number} width Width (in pixels) |
1845 | * @param {Number} height Height (in pixels) | |
1846 | */ | |
1847 | Dygraph.prototype.resize = function(width, height) { | |
1848 | if ((width === null) != (height === null)) { | |
1849 | this.warn("Dygraph.resize() should be called with zero parameters or " + | |
1850 | "two non-NULL parameters. Pretending it was zero."); | |
1851 | width = height = null; | |
1852 | } | |
1853 | ||
b16e6369 | 1854 | // TODO(danvk): there should be a clear() method. |
697e70b2 | 1855 | this.maindiv_.innerHTML = ""; |
b16e6369 DV |
1856 | this.attrs_.labelsDiv = null; |
1857 | ||
697e70b2 DV |
1858 | if (width) { |
1859 | this.maindiv_.style.width = width + "px"; | |
1860 | this.maindiv_.style.height = height + "px"; | |
1861 | this.width_ = width; | |
1862 | this.height_ = height; | |
1863 | } else { | |
1864 | this.width_ = this.maindiv_.offsetWidth; | |
1865 | this.height_ = this.maindiv_.offsetHeight; | |
1866 | } | |
1867 | ||
1868 | this.createInterface_(); | |
964f30c6 | 1869 | this.drawGraph_(this.rawData_); |
697e70b2 DV |
1870 | }; |
1871 | ||
1872 | /** | |
6a1aa64f DV |
1873 | * Adjusts the number of days in the rolling average. Updates the graph to |
1874 | * reflect the new averaging period. | |
1875 | * @param {Number} length Number of days over which to average the data. | |
1876 | */ | |
285a6bda | 1877 | Dygraph.prototype.adjustRoll = function(length) { |
6a1aa64f DV |
1878 | this.rollPeriod_ = length; |
1879 | this.drawGraph_(this.rawData_); | |
1880 | }; | |
540d00f1 | 1881 | |
f8cfec73 | 1882 | /** |
1cf11047 DV |
1883 | * Returns a boolean array of visibility statuses. |
1884 | */ | |
1885 | Dygraph.prototype.visibility = function() { | |
1886 | // Do lazy-initialization, so that this happens after we know the number of | |
1887 | // data series. | |
1888 | if (!this.attr_("visibility")) { | |
f38dec01 | 1889 | this.attrs_["visibility"] = []; |
1cf11047 DV |
1890 | } |
1891 | while (this.attr_("visibility").length < this.rawData_[0].length - 1) { | |
f38dec01 | 1892 | this.attr_("visibility").push(true); |
1cf11047 DV |
1893 | } |
1894 | return this.attr_("visibility"); | |
1895 | }; | |
1896 | ||
1897 | /** | |
1898 | * Changes the visiblity of a series. | |
1899 | */ | |
1900 | Dygraph.prototype.setVisibility = function(num, value) { | |
1901 | var x = this.visibility(); | |
1902 | if (num < 0 && num >= x.length) { | |
1903 | this.warn("invalid series number in setVisibility: " + num); | |
1904 | } else { | |
1905 | x[num] = value; | |
1906 | this.drawGraph_(this.rawData_); | |
1907 | } | |
1908 | }; | |
1909 | ||
1910 | /** | |
f8cfec73 DV |
1911 | * Create a new canvas element. This is more complex than a simple |
1912 | * document.createElement("canvas") because of IE and excanvas. | |
1913 | */ | |
1914 | Dygraph.createCanvas = function() { | |
1915 | var canvas = document.createElement("canvas"); | |
1916 | ||
1917 | isIE = (/MSIE/.test(navigator.userAgent) && !window.opera); | |
1918 | if (isIE) { | |
1919 | canvas = G_vmlCanvasManager.initElement(canvas); | |
1920 | } | |
1921 | ||
1922 | return canvas; | |
1923 | }; | |
1924 | ||
540d00f1 DV |
1925 | |
1926 | /** | |
285a6bda | 1927 | * A wrapper around Dygraph that implements the gviz API. |
540d00f1 DV |
1928 | * @param {Object} container The DOM object the visualization should live in. |
1929 | */ | |
285a6bda | 1930 | Dygraph.GVizChart = function(container) { |
540d00f1 DV |
1931 | this.container = container; |
1932 | } | |
1933 | ||
285a6bda | 1934 | Dygraph.GVizChart.prototype.draw = function(data, options) { |
540d00f1 | 1935 | this.container.innerHTML = ''; |
285a6bda | 1936 | this.date_graph = new Dygraph(this.container, data, options); |
540d00f1 | 1937 | } |
285a6bda DV |
1938 | |
1939 | // Older pages may still use this name. | |
1940 | DateGraph = Dygraph; |