add includeZero test to no-range
[dygraphs.git] / dygraph.js
CommitLineData
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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
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6 * string. Dygraph can handle multiple series with or without error bars. The
7 * date/value ranges will be automatically set. Dygraph uses the
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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">
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14 new Dygraph(document.getElementById("graphdiv"),
15 "datafile.csv", // CSV file with headers
16 { }); // options
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17 </script>
18
19 The CSV file is of the form
20
285a6bda 21 Date,SeriesA,SeriesB,SeriesC
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22 YYYYMMDD,A1,B1,C1
23 YYYYMMDD,A2,B2,C2
24
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25 If the 'errorBars' option is set in the constructor, the input should be of
26 the form
27
285a6bda 28 Date,SeriesA,SeriesB,...
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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,...
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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
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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,...
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50 * @param {Object} attrs Various other attributes, e.g. errorBars determines
51 * whether the input data contains error ranges.
52 */
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53Dygraph = 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 }
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65};
66
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67Dygraph.NAME = "Dygraph";
68Dygraph.VERSION = "1.2";
69Dygraph.__repr__ = function() {
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70 return "[" + this.NAME + " " + this.VERSION + "]";
71};
285a6bda 72Dygraph.toString = function() {
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73 return this.__repr__();
74};
75
76// Various default values
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77Dygraph.DEFAULT_ROLL_PERIOD = 1;
78Dygraph.DEFAULT_WIDTH = 480;
79Dygraph.DEFAULT_HEIGHT = 320;
80Dygraph.AXIS_LINE_WIDTH = 0.3;
6a1aa64f 81
8e4a6af3 82// Default attribute values.
285a6bda 83Dygraph.DEFAULT_ATTRS = {
a9fc39ab 84 highlightCircleSize: 3,
8e4a6af3 85 pixelsPerXLabel: 60,
c6336f04 86 pixelsPerYLabel: 30,
285a6bda 87
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88 labelsDivWidth: 250,
89 labelsDivStyles: {
90 // TODO(danvk): move defaults from createStatusMessage_ here.
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91 },
92 labelsSeparateLines: false,
93 labelsKMB: false,
afefbcdb 94 labelsKMG2: false,
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95
96 strokeWidth: 1.0,
8e4a6af3 97
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98 axisTickSize: 3,
99 axisLabelFontSize: 14,
100 xAxisLabelWidth: 50,
101 yAxisLabelWidth: 50,
102 rightGap: 5,
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103
104 showRoller: false,
105 xValueFormatter: Dygraph.dateString_,
106 xValueParser: Dygraph.dateParser,
107 xTicker: Dygraph.dateTicker,
108
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109 delimiter: ',',
110
ff00d3e2 111 logScale: false,
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112 sigma: 2.0,
113 errorBars: false,
114 fractions: false,
115 wilsonInterval: true, // only relevant if fractions is true
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116 customBars: false,
117 fillGraph: false
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118};
119
120// Various logging levels.
121Dygraph.DEBUG = 1;
122Dygraph.INFO = 2;
123Dygraph.WARNING = 3;
124Dygraph.ERROR = 3;
125
126Dygraph.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 });
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134 }
135 this.__init__(div, file, attrs);
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136};
137
6a1aa64f 138/**
285a6bda 139 * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit
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140 * and interaction &lt;canvas&gt; 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 */
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147Dygraph.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;
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158 this.dateWindow_ = attrs.dateWindow || null;
159 this.valueRange_ = attrs.valueRange || null;
6a1aa64f 160 this.wilsonInterval_ = attrs.wilsonInterval || true;
8e4a6af3 161
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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
c21d2c2d 166 // If the div isn't already sized then inherit from our attrs or
167 // give it a default size.
285a6bda 168 if (div.style.width == '') {
c21d2c2d 169 div.style.width = attrs.width || Dygraph.DEFAULT_WIDTH + "px";
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170 }
171 if (div.style.height == '') {
c21d2c2d 172 div.style.height = attrs.height || Dygraph.DEFAULT_HEIGHT + "px";
32988383 173 }
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174 this.width_ = parseInt(div.style.width, 10);
175 this.height_ = parseInt(div.style.height, 10);
c21d2c2d 176 // The div might have been specified as percent of the current window size,
177 // convert that to an appropriate number of pixels.
178 if (div.style.width.indexOf("%") == div.style.width.length - 1) {
179 // Minus ten pixels keeps scrollbars from showing up for a 100% width div.
180 this.width_ = (this.width_ * self.innerWidth / 100) - 10;
181 }
182 if (div.style.height.indexOf("%") == div.style.height.length - 1) {
183 this.height_ = (this.height_ * self.innerHeight / 100) - 10;
184 }
32988383 185
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186 // Dygraphs has many options, some of which interact with one another.
187 // To keep track of everything, we maintain two sets of options:
188 //
c21d2c2d 189 // this.user_attrs_ only options explicitly set by the user.
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190 // this.attrs_ defaults, options derived from user_attrs_, data.
191 //
192 // Options are then accessed this.attr_('attr'), which first looks at
193 // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent
194 // defaults without overriding behavior that the user specifically asks for.
195 this.user_attrs_ = {};
fc80a396 196 Dygraph.update(this.user_attrs_, attrs);
6a1aa64f 197
285a6bda 198 this.attrs_ = {};
fc80a396 199 Dygraph.update(this.attrs_, Dygraph.DEFAULT_ATTRS);
6a1aa64f 200
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201 // Make a note of whether labels will be pulled from the CSV file.
202 this.labelsFromCSV_ = (this.attr_("labels") == null);
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203
204 // Create the containing DIV and other interactive elements
205 this.createInterface_();
206
738fc797 207 this.start_();
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208};
209
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210Dygraph.prototype.attr_ = function(name) {
211 if (typeof(this.user_attrs_[name]) != 'undefined') {
212 return this.user_attrs_[name];
213 } else if (typeof(this.attrs_[name]) != 'undefined') {
214 return this.attrs_[name];
215 } else {
216 return null;
217 }
218};
219
220// TODO(danvk): any way I can get the line numbers to be this.warn call?
221Dygraph.prototype.log = function(severity, message) {
222 if (typeof(console) != 'undefined') {
223 switch (severity) {
224 case Dygraph.DEBUG:
225 console.debug('dygraphs: ' + message);
226 break;
227 case Dygraph.INFO:
228 console.info('dygraphs: ' + message);
229 break;
230 case Dygraph.WARNING:
231 console.warn('dygraphs: ' + message);
232 break;
233 case Dygraph.ERROR:
234 console.error('dygraphs: ' + message);
235 break;
236 }
237 }
238}
239Dygraph.prototype.info = function(message) {
240 this.log(Dygraph.INFO, message);
241}
242Dygraph.prototype.warn = function(message) {
243 this.log(Dygraph.WARNING, message);
244}
245Dygraph.prototype.error = function(message) {
246 this.log(Dygraph.ERROR, message);
247}
248
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249/**
250 * Returns the current rolling period, as set by the user or an option.
251 * @return {Number} The number of days in the rolling window
252 */
285a6bda 253Dygraph.prototype.rollPeriod = function() {
6a1aa64f 254 return this.rollPeriod_;
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255};
256
257Dygraph.addEvent = function(el, evt, fn) {
258 var normed_fn = function(e) {
259 if (!e) var e = window.event;
260 fn(e);
261 };
262 if (window.addEventListener) { // Mozilla, Netscape, Firefox
263 el.addEventListener(evt, normed_fn, false);
264 } else { // IE
265 el.attachEvent('on' + evt, normed_fn);
266 }
267};
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268
269/**
285a6bda 270 * Generates interface elements for the Dygraph: a containing div, a div to
6a1aa64f 271 * display the current point, and a textbox to adjust the rolling average
697e70b2 272 * period. Also creates the Renderer/Layout elements.
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273 * @private
274 */
285a6bda 275Dygraph.prototype.createInterface_ = function() {
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276 // Create the all-enclosing graph div
277 var enclosing = this.maindiv_;
278
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279 this.graphDiv = document.createElement("div");
280 this.graphDiv.style.width = this.width_ + "px";
281 this.graphDiv.style.height = this.height_ + "px";
282 enclosing.appendChild(this.graphDiv);
283
284 // Create the canvas for interactive parts of the chart.
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285 // this.canvas_ = document.createElement("canvas");
286 this.canvas_ = Dygraph.createCanvas();
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287 this.canvas_.style.position = "absolute";
288 this.canvas_.width = this.width_;
289 this.canvas_.height = this.height_;
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290 this.canvas_.style.width = this.width_ + "px"; // for IE
291 this.canvas_.style.height = this.height_ + "px"; // for IE
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292 this.graphDiv.appendChild(this.canvas_);
293
294 // ... and for static parts of the chart.
6a1aa64f 295 this.hidden_ = this.createPlotKitCanvas_(this.canvas_);
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296
297 var dygraph = this;
298 Dygraph.addEvent(this.hidden_, 'mousemove', function(e) {
299 dygraph.mouseMove_(e);
300 });
301 Dygraph.addEvent(this.hidden_, 'mouseout', function(e) {
302 dygraph.mouseOut_(e);
303 });
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304
305 // Create the grapher
306 // TODO(danvk): why does the Layout need its own set of options?
307 this.layoutOptions_ = { 'xOriginIsZero': false };
308 Dygraph.update(this.layoutOptions_, this.attrs_);
309 Dygraph.update(this.layoutOptions_, this.user_attrs_);
310 Dygraph.update(this.layoutOptions_, {
311 'errorBars': (this.attr_("errorBars") || this.attr_("customBars")) });
312
313 this.layout_ = new DygraphLayout(this, this.layoutOptions_);
314
315 // TODO(danvk): why does the Renderer need its own set of options?
316 this.renderOptions_ = { colorScheme: this.colors_,
317 strokeColor: null,
318 axisLineWidth: Dygraph.AXIS_LINE_WIDTH };
319 Dygraph.update(this.renderOptions_, this.attrs_);
320 Dygraph.update(this.renderOptions_, this.user_attrs_);
321 this.plotter_ = new DygraphCanvasRenderer(this,
322 this.hidden_, this.layout_,
323 this.renderOptions_);
324
325 this.createStatusMessage_();
326 this.createRollInterface_();
327 this.createDragInterface_();
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328}
329
330/**
331 * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on
285a6bda 332 * this particular canvas. All Dygraph work is done on this.canvas_.
8846615a 333 * @param {Object} canvas The Dygraph canvas over which to overlay the plot
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334 * @return {Object} The newly-created canvas
335 * @private
336 */
285a6bda 337Dygraph.prototype.createPlotKitCanvas_ = function(canvas) {
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338 // var h = document.createElement("canvas");
339 var h = Dygraph.createCanvas();
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340 h.style.position = "absolute";
341 h.style.top = canvas.style.top;
342 h.style.left = canvas.style.left;
343 h.width = this.width_;
344 h.height = this.height_;
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345 h.style.width = this.width_ + "px"; // for IE
346 h.style.height = this.height_ + "px"; // for IE
b0c3b730 347 this.graphDiv.appendChild(h);
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348 return h;
349};
350
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351// Taken from MochiKit.Color
352Dygraph.hsvToRGB = function (hue, saturation, value) {
353 var red;
354 var green;
355 var blue;
356 if (saturation === 0) {
357 red = value;
358 green = value;
359 blue = value;
360 } else {
361 var i = Math.floor(hue * 6);
362 var f = (hue * 6) - i;
363 var p = value * (1 - saturation);
364 var q = value * (1 - (saturation * f));
365 var t = value * (1 - (saturation * (1 - f)));
366 switch (i) {
367 case 1: red = q; green = value; blue = p; break;
368 case 2: red = p; green = value; blue = t; break;
369 case 3: red = p; green = q; blue = value; break;
370 case 4: red = t; green = p; blue = value; break;
371 case 5: red = value; green = p; blue = q; break;
372 case 6: // fall through
373 case 0: red = value; green = t; blue = p; break;
374 }
375 }
376 red = Math.floor(255 * red + 0.5);
377 green = Math.floor(255 * green + 0.5);
378 blue = Math.floor(255 * blue + 0.5);
379 return 'rgb(' + red + ',' + green + ',' + blue + ')';
380};
381
382
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383/**
384 * Generate a set of distinct colors for the data series. This is done with a
385 * color wheel. Saturation/Value are customizable, and the hue is
386 * equally-spaced around the color wheel. If a custom set of colors is
387 * specified, that is used instead.
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388 * @private
389 */
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390Dygraph.prototype.setColors_ = function() {
391 // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do
392 // away with this.renderOptions_.
393 var num = this.attr_("labels").length - 1;
6a1aa64f 394 this.colors_ = [];
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395 var colors = this.attr_('colors');
396 if (!colors) {
397 var sat = this.attr_('colorSaturation') || 1.0;
398 var val = this.attr_('colorValue') || 0.5;
6a1aa64f 399 for (var i = 1; i <= num; i++) {
ec1959eb 400 if (!this.visibility()[i-1]) continue;
6a1aa64f 401 var hue = (1.0*i/(1+num));
f474c2a3 402 this.colors_.push( Dygraph.hsvToRGB(hue, sat, val) );
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403 }
404 } else {
405 for (var i = 0; i < num; i++) {
ec1959eb 406 if (!this.visibility()[i]) continue;
285a6bda 407 var colorStr = colors[i % colors.length];
f474c2a3 408 this.colors_.push(colorStr);
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409 }
410 }
285a6bda 411
c21d2c2d 412 // TODO(danvk): update this w/r/t/ the new options system.
285a6bda 413 this.renderOptions_.colorScheme = this.colors_;
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414 Dygraph.update(this.plotter_.options, this.renderOptions_);
415 Dygraph.update(this.layoutOptions_, this.user_attrs_);
416 Dygraph.update(this.layoutOptions_, this.attrs_);
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417}
418
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419// The following functions are from quirksmode.org
420// http://www.quirksmode.org/js/findpos.html
421Dygraph.findPosX = function(obj) {
422 var curleft = 0;
423 if (obj.offsetParent) {
424 while (obj.offsetParent) {
425 curleft += obj.offsetLeft;
426 obj = obj.offsetParent;
427 }
428 }
429 else if (obj.x)
430 curleft += obj.x;
431 return curleft;
432};
c21d2c2d 433
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434Dygraph.findPosY = function(obj) {
435 var curtop = 0;
436 if (obj.offsetParent) {
437 while (obj.offsetParent) {
438 curtop += obj.offsetTop;
439 obj = obj.offsetParent;
440 }
441 }
442 else if (obj.y)
443 curtop += obj.y;
444 return curtop;
445};
446
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447/**
448 * Create the div that contains information on the selected point(s)
449 * This goes in the top right of the canvas, unless an external div has already
450 * been specified.
451 * @private
452 */
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453Dygraph.prototype.createStatusMessage_ = function(){
454 if (!this.attr_("labelsDiv")) {
455 var divWidth = this.attr_('labelsDivWidth');
b0c3b730 456 var messagestyle = {
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457 "position": "absolute",
458 "fontSize": "14px",
459 "zIndex": 10,
460 "width": divWidth + "px",
461 "top": "0px",
8846615a 462 "left": (this.width_ - divWidth - 2) + "px",
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463 "background": "white",
464 "textAlign": "left",
b0c3b730 465 "overflow": "hidden"};
fc80a396 466 Dygraph.update(messagestyle, this.attr_('labelsDivStyles'));
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467 var div = document.createElement("div");
468 for (var name in messagestyle) {
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469 if (messagestyle.hasOwnProperty(name)) {
470 div.style[name] = messagestyle[name];
471 }
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472 }
473 this.graphDiv.appendChild(div);
285a6bda 474 this.attrs_.labelsDiv = div;
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475 }
476};
477
478/**
479 * Create the text box to adjust the averaging period
480 * @return {Object} The newly-created text box
481 * @private
482 */
285a6bda 483Dygraph.prototype.createRollInterface_ = function() {
285a6bda 484 var display = this.attr_('showRoller') ? "block" : "none";
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485 var textAttr = { "position": "absolute",
486 "zIndex": 10,
487 "top": (this.plotter_.area.h - 25) + "px",
488 "left": (this.plotter_.area.x + 1) + "px",
489 "display": display
6a1aa64f 490 };
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491 var roller = document.createElement("input");
492 roller.type = "text";
493 roller.size = "2";
494 roller.value = this.rollPeriod_;
495 for (var name in textAttr) {
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496 if (textAttr.hasOwnProperty(name)) {
497 roller.style[name] = textAttr[name];
498 }
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499 }
500
6a1aa64f 501 var pa = this.graphDiv;
b0c3b730 502 pa.appendChild(roller);
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503 var dygraph = this;
504 roller.onchange = function() { dygraph.adjustRoll(roller.value); };
6a1aa64f 505 return roller;
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506};
507
508// These functions are taken from MochiKit.Signal
509Dygraph.pageX = function(e) {
510 if (e.pageX) {
511 return (!e.pageX || e.pageX < 0) ? 0 : e.pageX;
512 } else {
513 var de = document;
514 var b = document.body;
515 return e.clientX +
516 (de.scrollLeft || b.scrollLeft) -
517 (de.clientLeft || 0);
518 }
519};
520
521Dygraph.pageY = function(e) {
522 if (e.pageY) {
523 return (!e.pageY || e.pageY < 0) ? 0 : e.pageY;
524 } else {
525 var de = document;
526 var b = document.body;
527 return e.clientY +
528 (de.scrollTop || b.scrollTop) -
529 (de.clientTop || 0);
530 }
531};
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532
533/**
534 * Set up all the mouse handlers needed to capture dragging behavior for zoom
27385109 535 * events.
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536 * @private
537 */
285a6bda 538Dygraph.prototype.createDragInterface_ = function() {
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539 var self = this;
540
541 // Tracks whether the mouse is down right now
bce01b0f 542 var isZooming = false;
c776c216 543 var isPanning = false;
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544 var dragStartX = null;
545 var dragStartY = null;
546 var dragEndX = null;
547 var dragEndY = null;
548 var prevEndX = null;
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549 var draggingDate = null;
550 var dateRange = null;
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551
552 // Utility function to convert page-wide coordinates to canvas coords
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553 var px = 0;
554 var py = 0;
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555 var getX = function(e) { return Dygraph.pageX(e) - px };
556 var getY = function(e) { return Dygraph.pageX(e) - py };
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557
558 // Draw zoom rectangles when the mouse is down and the user moves around
76171648 559 Dygraph.addEvent(this.hidden_, 'mousemove', function(event) {
bce01b0f 560 if (isZooming) {
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561 dragEndX = getX(event);
562 dragEndY = getY(event);
563
564 self.drawZoomRect_(dragStartX, dragEndX, prevEndX);
565 prevEndX = dragEndX;
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566 } else if (isPanning) {
567 dragEndX = getX(event);
568 dragEndY = getY(event);
569
570 // Want to have it so that:
571 // 1. draggingDate appears at dragEndX
572 // 2. daterange = (dateWindow_[1] - dateWindow_[0]) is unaltered.
573
574 self.dateWindow_[0] = draggingDate - (dragEndX / self.width_) * dateRange;
575 self.dateWindow_[1] = self.dateWindow_[0] + dateRange;
576 self.drawGraph_(self.rawData_);
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577 }
578 });
579
580 // Track the beginning of drag events
76171648 581 Dygraph.addEvent(this.hidden_, 'mousedown', function(event) {
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582 px = Dygraph.findPosX(self.canvas_);
583 py = Dygraph.findPosY(self.canvas_);
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584 dragStartX = getX(event);
585 dragStartY = getY(event);
bce01b0f 586
2dab69c3 587 if (event.altKey || event.shiftKey) {
d12999d3 588 if (!self.dateWindow_) return; // have to be zoomed in to pan.
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589 isPanning = true;
590 dateRange = self.dateWindow_[1] - self.dateWindow_[0];
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591 draggingDate = (dragStartX / self.width_) * dateRange +
592 self.dateWindow_[0];
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593 } else {
594 isZooming = true;
595 }
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596 });
597
598 // If the user releases the mouse button during a drag, but not over the
599 // canvas, then it doesn't count as a zooming action.
76171648 600 Dygraph.addEvent(document, 'mouseup', function(event) {
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601 if (isZooming || isPanning) {
602 isZooming = false;
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603 dragStartX = null;
604 dragStartY = null;
605 }
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606
607 if (isPanning) {
608 isPanning = false;
609 draggingDate = null;
610 dateRange = null;
611 }
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612 });
613
614 // Temporarily cancel the dragging event when the mouse leaves the graph
76171648 615 Dygraph.addEvent(this.hidden_, 'mouseout', function(event) {
bce01b0f 616 if (isZooming) {
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617 dragEndX = null;
618 dragEndY = null;
619 }
620 });
621
622 // If the mouse is released on the canvas during a drag event, then it's a
623 // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels)
76171648 624 Dygraph.addEvent(this.hidden_, 'mouseup', function(event) {
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625 if (isZooming) {
626 isZooming = false;
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627 dragEndX = getX(event);
628 dragEndY = getY(event);
629 var regionWidth = Math.abs(dragEndX - dragStartX);
630 var regionHeight = Math.abs(dragEndY - dragStartY);
631
632 if (regionWidth < 2 && regionHeight < 2 &&
285a6bda 633 self.attr_('clickCallback') != null &&
6a1aa64f 634 self.lastx_ != undefined) {
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635 // TODO(danvk): pass along more info about the points.
636 self.attr_('clickCallback')(event, self.lastx_, self.selPoints_);
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637 }
638
639 if (regionWidth >= 10) {
640 self.doZoom_(Math.min(dragStartX, dragEndX),
641 Math.max(dragStartX, dragEndX));
642 } else {
643 self.canvas_.getContext("2d").clearRect(0, 0,
644 self.canvas_.width,
645 self.canvas_.height);
646 }
647
648 dragStartX = null;
649 dragStartY = null;
650 }
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651
652 if (isPanning) {
653 isPanning = false;
654 draggingDate = null;
655 dateRange = null;
656 }
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657 });
658
659 // Double-clicking zooms back out
76171648 660 Dygraph.addEvent(this.hidden_, 'dblclick', function(event) {
b258a3da 661 if (self.dateWindow_ == null) return;
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662 self.dateWindow_ = null;
663 self.drawGraph_(self.rawData_);
664 var minDate = self.rawData_[0][0];
665 var maxDate = self.rawData_[self.rawData_.length - 1][0];
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666 if (self.attr_("zoomCallback")) {
667 self.attr_("zoomCallback")(minDate, maxDate);
67e650dc 668 }
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669 });
670};
671
672/**
673 * Draw a gray zoom rectangle over the desired area of the canvas. Also clears
674 * up any previous zoom rectangles that were drawn. This could be optimized to
675 * avoid extra redrawing, but it's tricky to avoid interactions with the status
676 * dots.
677 * @param {Number} startX The X position where the drag started, in canvas
678 * coordinates.
679 * @param {Number} endX The current X position of the drag, in canvas coords.
680 * @param {Number} prevEndX The value of endX on the previous call to this
681 * function. Used to avoid excess redrawing
682 * @private
683 */
285a6bda 684Dygraph.prototype.drawZoomRect_ = function(startX, endX, prevEndX) {
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685 var ctx = this.canvas_.getContext("2d");
686
687 // Clean up from the previous rect if necessary
688 if (prevEndX) {
689 ctx.clearRect(Math.min(startX, prevEndX), 0,
690 Math.abs(startX - prevEndX), this.height_);
691 }
692
693 // Draw a light-grey rectangle to show the new viewing area
694 if (endX && startX) {
695 ctx.fillStyle = "rgba(128,128,128,0.33)";
696 ctx.fillRect(Math.min(startX, endX), 0,
697 Math.abs(endX - startX), this.height_);
698 }
699};
700
701/**
702 * Zoom to something containing [lowX, highX]. These are pixel coordinates
703 * in the canvas. The exact zoom window may be slightly larger if there are no
704 * data points near lowX or highX. This function redraws the graph.
705 * @param {Number} lowX The leftmost pixel value that should be visible.
706 * @param {Number} highX The rightmost pixel value that should be visible.
707 * @private
708 */
285a6bda 709Dygraph.prototype.doZoom_ = function(lowX, highX) {
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710 // Find the earliest and latest dates contained in this canvasx range.
711 var points = this.layout_.points;
712 var minDate = null;
713 var maxDate = null;
714 // Find the nearest [minDate, maxDate] that contains [lowX, highX]
715 for (var i = 0; i < points.length; i++) {
716 var cx = points[i].canvasx;
717 var x = points[i].xval;
718 if (cx < lowX && (minDate == null || x > minDate)) minDate = x;
719 if (cx > highX && (maxDate == null || x < maxDate)) maxDate = x;
720 }
721 // Use the extremes if either is missing
722 if (minDate == null) minDate = points[0].xval;
723 if (maxDate == null) maxDate = points[points.length-1].xval;
724
725 this.dateWindow_ = [minDate, maxDate];
726 this.drawGraph_(this.rawData_);
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727 if (this.attr_("zoomCallback")) {
728 this.attr_("zoomCallback")(minDate, maxDate);
67e650dc 729 }
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730};
731
732/**
733 * When the mouse moves in the canvas, display information about a nearby data
734 * point and draw dots over those points in the data series. This function
735 * takes care of cleanup of previously-drawn dots.
736 * @param {Object} event The mousemove event from the browser.
737 * @private
738 */
285a6bda 739Dygraph.prototype.mouseMove_ = function(event) {
76171648 740 var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(this.hidden_);
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741 var points = this.layout_.points;
742
743 var lastx = -1;
744 var lasty = -1;
745
746 // Loop through all the points and find the date nearest to our current
747 // location.
748 var minDist = 1e+100;
749 var idx = -1;
750 for (var i = 0; i < points.length; i++) {
751 var dist = Math.abs(points[i].canvasx - canvasx);
752 if (dist > minDist) break;
753 minDist = dist;
754 idx = i;
755 }
756 if (idx >= 0) lastx = points[idx].xval;
757 // Check that you can really highlight the last day's data
758 if (canvasx > points[points.length-1].canvasx)
759 lastx = points[points.length-1].xval;
760
761 // Extract the points we've selected
b258a3da 762 this.selPoints_ = [];
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763 for (var i = 0; i < points.length; i++) {
764 if (points[i].xval == lastx) {
b258a3da 765 this.selPoints_.push(points[i]);
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766 }
767 }
768
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769 if (this.attr_("highlightCallback")) {
770 this.attr_("highlightCallback")(event, lastx, this.selPoints_);
771 }
772
6a1aa64f 773 // Clear the previously drawn vertical, if there is one
285a6bda 774 var circleSize = this.attr_('highlightCircleSize');
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775 var ctx = this.canvas_.getContext("2d");
776 if (this.previousVerticalX_ >= 0) {
777 var px = this.previousVerticalX_;
778 ctx.clearRect(px - circleSize - 1, 0, 2 * circleSize + 2, this.height_);
779 }
780
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781 var isOK = function(x) { return x && !isNaN(x); };
782
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783 if (this.selPoints_.length > 0) {
784 var canvasx = this.selPoints_[0].canvasx;
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785
786 // Set the status message to indicate the selected point(s)
285a6bda 787 var replace = this.attr_('xValueFormatter')(lastx, this) + ":";
6a1aa64f 788 var clen = this.colors_.length;
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789 for (var i = 0; i < this.selPoints_.length; i++) {
790 if (!isOK(this.selPoints_[i].canvasy)) continue;
285a6bda 791 if (this.attr_("labelsSeparateLines")) {
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792 replace += "<br/>";
793 }
b258a3da 794 var point = this.selPoints_[i];
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795 var c = new RGBColor(this.colors_[i%clen]);
796 replace += " <b><font color='" + c.toHex() + "'>"
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797 + point.name + "</font></b>:"
798 + this.round_(point.yval, 2);
799 }
285a6bda 800 this.attr_("labelsDiv").innerHTML = replace;
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801
802 // Save last x position for callbacks.
803 this.lastx_ = lastx;
804
805 // Draw colored circles over the center of each selected point
806 ctx.save()
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807 for (var i = 0; i < this.selPoints_.length; i++) {
808 if (!isOK(this.selPoints_[i%clen].canvasy)) continue;
6a1aa64f 809 ctx.beginPath();
f474c2a3 810 ctx.fillStyle = this.colors_[i%clen];
b258a3da 811 ctx.arc(canvasx, this.selPoints_[i%clen].canvasy, circleSize,
7bf6a9fe 812 0, 2 * Math.PI, false);
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813 ctx.fill();
814 }
815 ctx.restore();
816
817 this.previousVerticalX_ = canvasx;
818 }
819};
820
821/**
822 * The mouse has left the canvas. Clear out whatever artifacts remain
823 * @param {Object} event the mouseout event from the browser.
824 * @private
825 */
285a6bda 826Dygraph.prototype.mouseOut_ = function(event) {
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827 // Get rid of the overlay data
828 var ctx = this.canvas_.getContext("2d");
829 ctx.clearRect(0, 0, this.width_, this.height_);
285a6bda 830 this.attr_("labelsDiv").innerHTML = "";
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831};
832
285a6bda 833Dygraph.zeropad = function(x) {
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DV
834 if (x < 10) return "0" + x; else return "" + x;
835}
836
6a1aa64f 837/**
6b8e33dd
DV
838 * Return a string version of the hours, minutes and seconds portion of a date.
839 * @param {Number} date The JavaScript date (ms since epoch)
840 * @return {String} A time of the form "HH:MM:SS"
841 * @private
842 */
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DV
843Dygraph.prototype.hmsString_ = function(date) {
844 var zeropad = Dygraph.zeropad;
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DV
845 var d = new Date(date);
846 if (d.getSeconds()) {
847 return zeropad(d.getHours()) + ":" +
848 zeropad(d.getMinutes()) + ":" +
849 zeropad(d.getSeconds());
850 } else if (d.getMinutes()) {
851 return zeropad(d.getHours()) + ":" + zeropad(d.getMinutes());
852 } else {
853 return zeropad(d.getHours());
854 }
855}
856
857/**
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858 * Convert a JS date (millis since epoch) to YYYY/MM/DD
859 * @param {Number} date The JavaScript date (ms since epoch)
860 * @return {String} A date of the form "YYYY/MM/DD"
861 * @private
285a6bda 862 * TODO(danvk): why is this part of the prototype?
6a1aa64f 863 */
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DV
864Dygraph.dateString_ = function(date, self) {
865 var zeropad = Dygraph.zeropad;
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866 var d = new Date(date);
867
868 // Get the year:
869 var year = "" + d.getFullYear();
870 // Get a 0 padded month string
6b8e33dd 871 var month = zeropad(d.getMonth() + 1); //months are 0-offset, sigh
6a1aa64f 872 // Get a 0 padded day string
6b8e33dd 873 var day = zeropad(d.getDate());
6a1aa64f 874
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DV
875 var ret = "";
876 var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds();
285a6bda 877 if (frac) ret = " " + self.hmsString_(date);
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DV
878
879 return year + "/" + month + "/" + day + ret;
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DV
880};
881
882/**
883 * Round a number to the specified number of digits past the decimal point.
884 * @param {Number} num The number to round
885 * @param {Number} places The number of decimals to which to round
886 * @return {Number} The rounded number
887 * @private
888 */
285a6bda 889Dygraph.prototype.round_ = function(num, places) {
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DV
890 var shift = Math.pow(10, places);
891 return Math.round(num * shift)/shift;
892};
893
894/**
895 * Fires when there's data available to be graphed.
896 * @param {String} data Raw CSV data to be plotted
897 * @private
898 */
285a6bda 899Dygraph.prototype.loadedEvent_ = function(data) {
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900 this.rawData_ = this.parseCSV_(data);
901 this.drawGraph_(this.rawData_);
902};
903
285a6bda 904Dygraph.prototype.months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
8846615a 905 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
285a6bda 906Dygraph.prototype.quarters = ["Jan", "Apr", "Jul", "Oct"];
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907
908/**
909 * Add ticks on the x-axis representing years, months, quarters, weeks, or days
910 * @private
911 */
285a6bda 912Dygraph.prototype.addXTicks_ = function() {
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913 // Determine the correct ticks scale on the x-axis: quarterly, monthly, ...
914 var startDate, endDate;
915 if (this.dateWindow_) {
916 startDate = this.dateWindow_[0];
917 endDate = this.dateWindow_[1];
918 } else {
919 startDate = this.rawData_[0][0];
920 endDate = this.rawData_[this.rawData_.length - 1][0];
921 }
922
285a6bda 923 var xTicks = this.attr_('xTicker')(startDate, endDate, this);
6a1aa64f 924 this.layout_.updateOptions({xTicks: xTicks});
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925};
926
927// Time granularity enumeration
285a6bda 928Dygraph.SECONDLY = 0;
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929Dygraph.TWO_SECONDLY = 1;
930Dygraph.FIVE_SECONDLY = 2;
931Dygraph.TEN_SECONDLY = 3;
932Dygraph.THIRTY_SECONDLY = 4;
933Dygraph.MINUTELY = 5;
934Dygraph.TWO_MINUTELY = 6;
935Dygraph.FIVE_MINUTELY = 7;
936Dygraph.TEN_MINUTELY = 8;
937Dygraph.THIRTY_MINUTELY = 9;
938Dygraph.HOURLY = 10;
939Dygraph.TWO_HOURLY = 11;
940Dygraph.SIX_HOURLY = 12;
941Dygraph.DAILY = 13;
942Dygraph.WEEKLY = 14;
943Dygraph.MONTHLY = 15;
944Dygraph.QUARTERLY = 16;
945Dygraph.BIANNUAL = 17;
946Dygraph.ANNUAL = 18;
947Dygraph.DECADAL = 19;
948Dygraph.NUM_GRANULARITIES = 20;
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949
950Dygraph.SHORT_SPACINGS = [];
951Dygraph.SHORT_SPACINGS[Dygraph.SECONDLY] = 1000 * 1;
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952Dygraph.SHORT_SPACINGS[Dygraph.TWO_SECONDLY] = 1000 * 2;
953Dygraph.SHORT_SPACINGS[Dygraph.FIVE_SECONDLY] = 1000 * 5;
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DV
954Dygraph.SHORT_SPACINGS[Dygraph.TEN_SECONDLY] = 1000 * 10;
955Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_SECONDLY] = 1000 * 30;
956Dygraph.SHORT_SPACINGS[Dygraph.MINUTELY] = 1000 * 60;
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957Dygraph.SHORT_SPACINGS[Dygraph.TWO_MINUTELY] = 1000 * 60 * 2;
958Dygraph.SHORT_SPACINGS[Dygraph.FIVE_MINUTELY] = 1000 * 60 * 5;
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959Dygraph.SHORT_SPACINGS[Dygraph.TEN_MINUTELY] = 1000 * 60 * 10;
960Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_MINUTELY] = 1000 * 60 * 30;
961Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600;
20a41c17 962Dygraph.SHORT_SPACINGS[Dygraph.TWO_HOURLY] = 1000 * 3600 * 2;
805d5519 963Dygraph.SHORT_SPACINGS[Dygraph.SIX_HOURLY] = 1000 * 3600 * 6;
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DV
964Dygraph.SHORT_SPACINGS[Dygraph.DAILY] = 1000 * 86400;
965Dygraph.SHORT_SPACINGS[Dygraph.WEEKLY] = 1000 * 604800;
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966
967// NumXTicks()
968//
969// If we used this time granularity, how many ticks would there be?
970// This is only an approximation, but it's generally good enough.
971//
285a6bda
DV
972Dygraph.prototype.NumXTicks = function(start_time, end_time, granularity) {
973 if (granularity < Dygraph.MONTHLY) {
32988383 974 // Generate one tick mark for every fixed interval of time.
285a6bda 975 var spacing = Dygraph.SHORT_SPACINGS[granularity];
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976 return Math.floor(0.5 + 1.0 * (end_time - start_time) / spacing);
977 } else {
978 var year_mod = 1; // e.g. to only print one point every 10 years.
979 var num_months = 12;
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980 if (granularity == Dygraph.QUARTERLY) num_months = 3;
981 if (granularity == Dygraph.BIANNUAL) num_months = 2;
982 if (granularity == Dygraph.ANNUAL) num_months = 1;
983 if (granularity == Dygraph.DECADAL) { num_months = 1; year_mod = 10; }
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984
985 var msInYear = 365.2524 * 24 * 3600 * 1000;
986 var num_years = 1.0 * (end_time - start_time) / msInYear;
987 return Math.floor(0.5 + 1.0 * num_years * num_months / year_mod);
988 }
989};
990
991// GetXAxis()
992//
993// Construct an x-axis of nicely-formatted times on meaningful boundaries
994// (e.g. 'Jan 09' rather than 'Jan 22, 2009').
995//
996// Returns an array containing {v: millis, label: label} dictionaries.
997//
285a6bda 998Dygraph.prototype.GetXAxis = function(start_time, end_time, granularity) {
32988383 999 var ticks = [];
285a6bda 1000 if (granularity < Dygraph.MONTHLY) {
32988383 1001 // Generate one tick mark for every fixed interval of time.
285a6bda 1002 var spacing = Dygraph.SHORT_SPACINGS[granularity];
3d29302c 1003 var format = '%d%b'; // e.g. "1Jan"
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1004
1005 // Find a time less than start_time which occurs on a "nice" time boundary
1006 // for this granularity.
1007 var g = spacing / 1000;
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1008 var d = new Date(start_time);
1009 if (g <= 60) { // seconds
1010 var x = d.getSeconds(); d.setSeconds(x - x % g);
1011 } else {
1012 d.setSeconds(0);
1013 g /= 60;
1014 if (g <= 60) { // minutes
1015 var x = d.getMinutes(); d.setMinutes(x - x % g);
1016 } else {
1017 d.setMinutes(0);
1018 g /= 60;
1019
1020 if (g <= 24) { // days
1021 var x = d.getHours(); d.setHours(x - x % g);
1022 } else {
1023 d.setHours(0);
1024 g /= 24;
1025
1026 if (g == 7) { // one week
20a41c17 1027 d.setDate(d.getDate() - d.getDay());
076c9622
DV
1028 }
1029 }
1030 }
328bb812 1031 }
076c9622
DV
1032 start_time = d.getTime();
1033
32988383
DV
1034 for (var t = start_time; t <= end_time; t += spacing) {
1035 var d = new Date(t);
1036 var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds();
285a6bda 1037 if (frac == 0 || granularity >= Dygraph.DAILY) {
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1038 // the extra hour covers DST problems.
1039 ticks.push({ v:t, label: new Date(t + 3600*1000).strftime(format) });
1040 } else {
1041 ticks.push({ v:t, label: this.hmsString_(t) });
1042 }
1043 }
1044 } else {
1045 // Display a tick mark on the first of a set of months of each year.
1046 // Years get a tick mark iff y % year_mod == 0. This is useful for
1047 // displaying a tick mark once every 10 years, say, on long time scales.
1048 var months;
1049 var year_mod = 1; // e.g. to only print one point every 10 years.
1050
285a6bda 1051 if (granularity == Dygraph.MONTHLY) {
32988383 1052 months = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ];
285a6bda 1053 } else if (granularity == Dygraph.QUARTERLY) {
32988383 1054 months = [ 0, 3, 6, 9 ];
285a6bda 1055 } else if (granularity == Dygraph.BIANNUAL) {
32988383 1056 months = [ 0, 6 ];
285a6bda 1057 } else if (granularity == Dygraph.ANNUAL) {
32988383 1058 months = [ 0 ];
285a6bda 1059 } else if (granularity == Dygraph.DECADAL) {
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DV
1060 months = [ 0 ];
1061 year_mod = 10;
1062 }
1063
1064 var start_year = new Date(start_time).getFullYear();
1065 var end_year = new Date(end_time).getFullYear();
285a6bda 1066 var zeropad = Dygraph.zeropad;
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DV
1067 for (var i = start_year; i <= end_year; i++) {
1068 if (i % year_mod != 0) continue;
1069 for (var j = 0; j < months.length; j++) {
1070 var date_str = i + "/" + zeropad(1 + months[j]) + "/01";
1071 var t = Date.parse(date_str);
1072 if (t < start_time || t > end_time) continue;
1073 ticks.push({ v:t, label: new Date(t).strftime('%b %y') });
1074 }
1075 }
1076 }
1077
1078 return ticks;
1079};
1080
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1081
1082/**
1083 * Add ticks to the x-axis based on a date range.
1084 * @param {Number} startDate Start of the date window (millis since epoch)
1085 * @param {Number} endDate End of the date window (millis since epoch)
1086 * @return {Array.<Object>} Array of {label, value} tuples.
1087 * @public
1088 */
285a6bda 1089Dygraph.dateTicker = function(startDate, endDate, self) {
32988383 1090 var chosen = -1;
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DV
1091 for (var i = 0; i < Dygraph.NUM_GRANULARITIES; i++) {
1092 var num_ticks = self.NumXTicks(startDate, endDate, i);
1093 if (self.width_ / num_ticks >= self.attr_('pixelsPerXLabel')) {
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DV
1094 chosen = i;
1095 break;
2769de62 1096 }
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DV
1097 }
1098
32988383 1099 if (chosen >= 0) {
285a6bda 1100 return self.GetXAxis(startDate, endDate, chosen);
6a1aa64f 1101 } else {
32988383 1102 // TODO(danvk): signal error.
6a1aa64f 1103 }
6a1aa64f
DV
1104};
1105
1106/**
1107 * Add ticks when the x axis has numbers on it (instead of dates)
1108 * @param {Number} startDate Start of the date window (millis since epoch)
1109 * @param {Number} endDate End of the date window (millis since epoch)
1110 * @return {Array.<Object>} Array of {label, value} tuples.
1111 * @public
1112 */
285a6bda 1113Dygraph.numericTicks = function(minV, maxV, self) {
c6336f04
DV
1114 // Basic idea:
1115 // Try labels every 1, 2, 5, 10, 20, 50, 100, etc.
1116 // Calculate the resulting tick spacing (i.e. this.height_ / nTicks).
285a6bda 1117 // The first spacing greater than pixelsPerYLabel is what we use.
ff00d3e2 1118 // TODO(danvk): version that works on a log scale.
f09e46d4
DV
1119 if (self.attr_("labelsKMG2")) {
1120 var mults = [1, 2, 4, 8];
1121 } else {
1122 var mults = [1, 2, 5];
1123 }
c6336f04 1124 var scale, low_val, high_val, nTicks;
285a6bda
DV
1125 // TODO(danvk): make it possible to set this for x- and y-axes independently.
1126 var pixelsPerTick = self.attr_('pixelsPerYLabel');
c6336f04 1127 for (var i = -10; i < 50; i++) {
f09e46d4
DV
1128 if (self.attr_("labelsKMG2")) {
1129 var base_scale = Math.pow(16, i);
1130 } else {
1131 var base_scale = Math.pow(10, i);
1132 }
c6336f04
DV
1133 for (var j = 0; j < mults.length; j++) {
1134 scale = base_scale * mults[j];
c6336f04
DV
1135 low_val = Math.floor(minV / scale) * scale;
1136 high_val = Math.ceil(maxV / scale) * scale;
1137 nTicks = (high_val - low_val) / scale;
285a6bda 1138 var spacing = self.height_ / nTicks;
c6336f04 1139 // wish I could break out of both loops at once...
285a6bda 1140 if (spacing > pixelsPerTick) break;
c6336f04 1141 }
285a6bda 1142 if (spacing > pixelsPerTick) break;
6a1aa64f
DV
1143 }
1144
1145 // Construct labels for the ticks
1146 var ticks = [];
ed11be50
DV
1147 var k;
1148 var k_labels = [];
1149 if (self.attr_("labelsKMB")) {
1150 k = 1000;
1151 k_labels = [ "K", "M", "B", "T" ];
1152 }
1153 if (self.attr_("labelsKMG2")) {
1154 if (k) self.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
1155 k = 1024;
1156 k_labels = [ "k", "M", "G", "T" ];
1157 }
1158
c6336f04
DV
1159 for (var i = 0; i < nTicks; i++) {
1160 var tickV = low_val + i * scale;
0af6e346 1161 var absTickV = Math.abs(tickV);
285a6bda 1162 var label = self.round_(tickV, 2);
ed11be50
DV
1163 if (k_labels.length) {
1164 // Round up to an appropriate unit.
1165 var n = k*k*k*k;
1166 for (var j = 3; j >= 0; j--, n /= k) {
1167 if (absTickV >= n) {
1168 label = self.round_(tickV / n, 1) + k_labels[j];
1169 break;
1170 }
afefbcdb 1171 }
6a1aa64f
DV
1172 }
1173 ticks.push( {label: label, v: tickV} );
1174 }
1175 return ticks;
1176};
1177
1178/**
1179 * Adds appropriate ticks on the y-axis
1180 * @param {Number} minY The minimum Y value in the data set
1181 * @param {Number} maxY The maximum Y value in the data set
1182 * @private
1183 */
285a6bda 1184Dygraph.prototype.addYTicks_ = function(minY, maxY) {
6a1aa64f 1185 // Set the number of ticks so that the labels are human-friendly.
285a6bda
DV
1186 // TODO(danvk): make this an attribute as well.
1187 var ticks = Dygraph.numericTicks(minY, maxY, this);
6a1aa64f
DV
1188 this.layout_.updateOptions( { yAxis: [minY, maxY],
1189 yTicks: ticks } );
1190};
1191
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DV
1192// Computes the range of the data series (including confidence intervals).
1193// series is either [ [x1, y1], [x2, y2], ... ] or
1194// [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ...
1195// Returns [low, high]
1196Dygraph.prototype.extremeValues_ = function(series) {
1197 var minY = null, maxY = null;
1198
9922b78b 1199 var bars = this.attr_("errorBars") || this.attr_("customBars");
5011e7a1
DV
1200 if (bars) {
1201 // With custom bars, maxY is the max of the high values.
1202 for (var j = 0; j < series.length; j++) {
1203 var y = series[j][1][0];
1204 if (!y) continue;
1205 var low = y - series[j][1][1];
1206 var high = y + series[j][1][2];
1207 if (low > y) low = y; // this can happen with custom bars,
1208 if (high < y) high = y; // e.g. in tests/custom-bars.html
1209 if (maxY == null || high > maxY) {
1210 maxY = high;
1211 }
1212 if (minY == null || low < minY) {
1213 minY = low;
1214 }
1215 }
1216 } else {
1217 for (var j = 0; j < series.length; j++) {
1218 var y = series[j][1];
d12999d3 1219 if (y === null || isNaN(y)) continue;
5011e7a1
DV
1220 if (maxY == null || y > maxY) {
1221 maxY = y;
1222 }
1223 if (minY == null || y < minY) {
1224 minY = y;
1225 }
1226 }
1227 }
1228
1229 return [minY, maxY];
1230};
1231
6a1aa64f
DV
1232/**
1233 * Update the graph with new data. Data is in the format
1234 * [ [date1, val1, val2, ...], [date2, val1, val2, ...] if errorBars=false
1235 * or, if errorBars=true,
1236 * [ [date1, [val1,stddev1], [val2,stddev2], ...], [date2, ...], ...]
1237 * @param {Array.<Object>} data The data (see above)
1238 * @private
1239 */
285a6bda 1240Dygraph.prototype.drawGraph_ = function(data) {
3bd9c228 1241 var minY = null, maxY = null;
6a1aa64f 1242 this.layout_.removeAllDatasets();
285a6bda 1243 this.setColors_();
9317362d 1244 this.attrs_['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
285a6bda 1245
6a1aa64f
DV
1246 // Loop over all fields in the dataset
1247 for (var i = 1; i < data[0].length; i++) {
1cf11047
DV
1248 if (!this.visibility()[i - 1]) continue;
1249
6a1aa64f
DV
1250 var series = [];
1251 for (var j = 0; j < data.length; j++) {
1252 var date = data[j][0];
1253 series[j] = [date, data[j][i]];
1254 }
1255 series = this.rollingAverage(series, this.rollPeriod_);
1256
1257 // Prune down to the desired range, if necessary (for zooming)
9922b78b 1258 var bars = this.attr_("errorBars") || this.attr_("customBars");
6a1aa64f
DV
1259 if (this.dateWindow_) {
1260 var low = this.dateWindow_[0];
1261 var high= this.dateWindow_[1];
1262 var pruned = [];
1263 for (var k = 0; k < series.length; k++) {
1264 if (series[k][0] >= low && series[k][0] <= high) {
1265 pruned.push(series[k]);
6a1aa64f
DV
1266 }
1267 }
1268 series = pruned;
6a1aa64f
DV
1269 }
1270
648acd28
DV
1271 var extremes = this.extremeValues_(series);
1272 var thisMinY = extremes[0];
1273 var thisMaxY = extremes[1];
5011e7a1
DV
1274 if (!minY || thisMinY < minY) minY = thisMinY;
1275 if (!maxY || thisMaxY > maxY) maxY = thisMaxY;
1276
6a1aa64f
DV
1277 if (bars) {
1278 var vals = [];
1279 for (var j=0; j<series.length; j++)
1280 vals[j] = [series[j][0],
1281 series[j][1][0], series[j][1][1], series[j][1][2]];
285a6bda 1282 this.layout_.addDataset(this.attr_("labels")[i], vals);
6a1aa64f 1283 } else {
285a6bda 1284 this.layout_.addDataset(this.attr_("labels")[i], series);
6a1aa64f
DV
1285 }
1286 }
1287
1288 // Use some heuristics to come up with a good maxY value, unless it's been
1289 // set explicitly by the user.
1290 if (this.valueRange_ != null) {
1291 this.addYTicks_(this.valueRange_[0], this.valueRange_[1]);
1292 } else {
1293 // Add some padding and round up to an integer to be human-friendly.
3bd9c228 1294 var span = maxY - minY;
93dfacfd
DV
1295 // special case: if we have no sense of scale, use +/-10% of the sole value.
1296 if (span == 0) { span = maxY; }
3bd9c228
DV
1297 var maxAxisY = maxY + 0.1 * span;
1298 var minAxisY = minY - 0.1 * span;
1299
1300 // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense.
ceb009dd
DV
1301 if (minAxisY < 0 && minY >= 0) minAxisY = 0;
1302 if (maxAxisY > 0 && maxY <= 0) maxAxisY = 0;
3bd9c228
DV
1303
1304 if (this.attr_("includeZero")) {
1305 if (maxY < 0) maxAxisY = 0;
1306 if (minY > 0) minAxisY = 0;
1307 }
1308
1309 this.addYTicks_(minAxisY, maxAxisY);
6a1aa64f
DV
1310 }
1311
1312 this.addXTicks_();
1313
1314 // Tell PlotKit to use this new data and render itself
d033ae1c 1315 this.layout_.updateOptions({dateWindow: this.dateWindow_});
6a1aa64f
DV
1316 this.layout_.evaluateWithError();
1317 this.plotter_.clear();
1318 this.plotter_.render();
f6401bf6
DV
1319 this.canvas_.getContext('2d').clearRect(0, 0, this.canvas_.width,
1320 this.canvas_.height);
6a1aa64f
DV
1321};
1322
1323/**
1324 * Calculates the rolling average of a data set.
1325 * If originalData is [label, val], rolls the average of those.
1326 * If originalData is [label, [, it's interpreted as [value, stddev]
1327 * and the roll is returned in the same form, with appropriately reduced
1328 * stddev for each value.
1329 * Note that this is where fractional input (i.e. '5/10') is converted into
1330 * decimal values.
1331 * @param {Array} originalData The data in the appropriate format (see above)
1332 * @param {Number} rollPeriod The number of days over which to average the data
1333 */
285a6bda 1334Dygraph.prototype.rollingAverage = function(originalData, rollPeriod) {
6a1aa64f
DV
1335 if (originalData.length < 2)
1336 return originalData;
1337 var rollPeriod = Math.min(rollPeriod, originalData.length - 1);
1338 var rollingData = [];
285a6bda 1339 var sigma = this.attr_("sigma");
6a1aa64f
DV
1340
1341 if (this.fractions_) {
1342 var num = 0;
1343 var den = 0; // numerator/denominator
1344 var mult = 100.0;
1345 for (var i = 0; i < originalData.length; i++) {
1346 num += originalData[i][1][0];
1347 den += originalData[i][1][1];
1348 if (i - rollPeriod >= 0) {
1349 num -= originalData[i - rollPeriod][1][0];
1350 den -= originalData[i - rollPeriod][1][1];
1351 }
1352
1353 var date = originalData[i][0];
1354 var value = den ? num / den : 0.0;
285a6bda 1355 if (this.attr_("errorBars")) {
6a1aa64f
DV
1356 if (this.wilsonInterval_) {
1357 // For more details on this confidence interval, see:
1358 // http://en.wikipedia.org/wiki/Binomial_confidence_interval
1359 if (den) {
1360 var p = value < 0 ? 0 : value, n = den;
1361 var pm = sigma * Math.sqrt(p*(1-p)/n + sigma*sigma/(4*n*n));
1362 var denom = 1 + sigma * sigma / den;
1363 var low = (p + sigma * sigma / (2 * den) - pm) / denom;
1364 var high = (p + sigma * sigma / (2 * den) + pm) / denom;
1365 rollingData[i] = [date,
1366 [p * mult, (p - low) * mult, (high - p) * mult]];
1367 } else {
1368 rollingData[i] = [date, [0, 0, 0]];
1369 }
1370 } else {
1371 var stddev = den ? sigma * Math.sqrt(value * (1 - value) / den) : 1.0;
1372 rollingData[i] = [date, [mult * value, mult * stddev, mult * stddev]];
1373 }
1374 } else {
1375 rollingData[i] = [date, mult * value];
1376 }
1377 }
9922b78b 1378 } else if (this.attr_("customBars")) {
f6885d6a
DV
1379 var low = 0;
1380 var mid = 0;
1381 var high = 0;
1382 var count = 0;
6a1aa64f
DV
1383 for (var i = 0; i < originalData.length; i++) {
1384 var data = originalData[i][1];
1385 var y = data[1];
1386 rollingData[i] = [originalData[i][0], [y, y - data[0], data[2] - y]];
f6885d6a 1387
8b91c51f 1388 if (y != null && !isNaN(y)) {
49a7d0d5
DV
1389 low += data[0];
1390 mid += y;
1391 high += data[2];
1392 count += 1;
1393 }
f6885d6a
DV
1394 if (i - rollPeriod >= 0) {
1395 var prev = originalData[i - rollPeriod];
8b91c51f 1396 if (prev[1][1] != null && !isNaN(prev[1][1])) {
49a7d0d5
DV
1397 low -= prev[1][0];
1398 mid -= prev[1][1];
1399 high -= prev[1][2];
1400 count -= 1;
1401 }
f6885d6a
DV
1402 }
1403 rollingData[i] = [originalData[i][0], [ 1.0 * mid / count,
1404 1.0 * (mid - low) / count,
1405 1.0 * (high - mid) / count ]];
2769de62 1406 }
6a1aa64f
DV
1407 } else {
1408 // Calculate the rolling average for the first rollPeriod - 1 points where
1409 // there is not enough data to roll over the full number of days
1410 var num_init_points = Math.min(rollPeriod - 1, originalData.length - 2);
285a6bda 1411 if (!this.attr_("errorBars")){
5011e7a1
DV
1412 if (rollPeriod == 1) {
1413 return originalData;
1414 }
1415
2847c1cf 1416 for (var i = 0; i < originalData.length; i++) {
6a1aa64f 1417 var sum = 0;
5011e7a1 1418 var num_ok = 0;
2847c1cf
DV
1419 for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) {
1420 var y = originalData[j][1];
8b91c51f 1421 if (y == null || isNaN(y)) continue;
5011e7a1 1422 num_ok++;
2847c1cf 1423 sum += originalData[j][1];
6a1aa64f 1424 }
5011e7a1 1425 if (num_ok) {
2847c1cf 1426 rollingData[i] = [originalData[i][0], sum / num_ok];
5011e7a1 1427 } else {
2847c1cf 1428 rollingData[i] = [originalData[i][0], null];
5011e7a1 1429 }
6a1aa64f 1430 }
2847c1cf
DV
1431
1432 } else {
1433 for (var i = 0; i < originalData.length; i++) {
6a1aa64f
DV
1434 var sum = 0;
1435 var variance = 0;
5011e7a1 1436 var num_ok = 0;
2847c1cf 1437 for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) {
5011e7a1 1438 var y = originalData[j][1][0];
8b91c51f 1439 if (y == null || isNaN(y)) continue;
5011e7a1 1440 num_ok++;
6a1aa64f
DV
1441 sum += originalData[j][1][0];
1442 variance += Math.pow(originalData[j][1][1], 2);
1443 }
5011e7a1
DV
1444 if (num_ok) {
1445 var stddev = Math.sqrt(variance) / num_ok;
1446 rollingData[i] = [originalData[i][0],
1447 [sum / num_ok, sigma * stddev, sigma * stddev]];
1448 } else {
1449 rollingData[i] = [originalData[i][0], [null, null, null]];
1450 }
6a1aa64f
DV
1451 }
1452 }
1453 }
1454
1455 return rollingData;
1456};
1457
1458/**
1459 * Parses a date, returning the number of milliseconds since epoch. This can be
285a6bda
DV
1460 * passed in as an xValueParser in the Dygraph constructor.
1461 * TODO(danvk): enumerate formats that this understands.
6a1aa64f
DV
1462 * @param {String} A date in YYYYMMDD format.
1463 * @return {Number} Milliseconds since epoch.
1464 * @public
1465 */
285a6bda 1466Dygraph.dateParser = function(dateStr, self) {
6a1aa64f 1467 var dateStrSlashed;
285a6bda 1468 var d;
2769de62 1469 if (dateStr.length == 10 && dateStr.search("-") != -1) { // e.g. '2009-07-12'
6a1aa64f 1470 dateStrSlashed = dateStr.replace("-", "/", "g");
353a0294
DV
1471 while (dateStrSlashed.search("-") != -1) {
1472 dateStrSlashed = dateStrSlashed.replace("-", "/");
1473 }
285a6bda 1474 d = Date.parse(dateStrSlashed);
2769de62 1475 } else if (dateStr.length == 8) { // e.g. '20090712'
285a6bda 1476 // TODO(danvk): remove support for this format. It's confusing.
6a1aa64f
DV
1477 dateStrSlashed = dateStr.substr(0,4) + "/" + dateStr.substr(4,2)
1478 + "/" + dateStr.substr(6,2);
285a6bda 1479 d = Date.parse(dateStrSlashed);
2769de62
DV
1480 } else {
1481 // Any format that Date.parse will accept, e.g. "2009/07/12" or
1482 // "2009/07/12 12:34:56"
285a6bda
DV
1483 d = Date.parse(dateStr);
1484 }
1485
1486 if (!d || isNaN(d)) {
1487 self.error("Couldn't parse " + dateStr + " as a date");
1488 }
1489 return d;
1490};
1491
1492/**
1493 * Detects the type of the str (date or numeric) and sets the various
1494 * formatting attributes in this.attrs_ based on this type.
1495 * @param {String} str An x value.
1496 * @private
1497 */
1498Dygraph.prototype.detectTypeFromString_ = function(str) {
1499 var isDate = false;
1500 if (str.indexOf('-') >= 0 ||
1501 str.indexOf('/') >= 0 ||
1502 isNaN(parseFloat(str))) {
1503 isDate = true;
1504 } else if (str.length == 8 && str > '19700101' && str < '20371231') {
1505 // TODO(danvk): remove support for this format.
1506 isDate = true;
1507 }
1508
1509 if (isDate) {
1510 this.attrs_.xValueFormatter = Dygraph.dateString_;
1511 this.attrs_.xValueParser = Dygraph.dateParser;
1512 this.attrs_.xTicker = Dygraph.dateTicker;
1513 } else {
1514 this.attrs_.xValueFormatter = function(x) { return x; };
1515 this.attrs_.xValueParser = function(x) { return parseFloat(x); };
1516 this.attrs_.xTicker = Dygraph.numericTicks;
6a1aa64f 1517 }
6a1aa64f
DV
1518};
1519
1520/**
1521 * Parses a string in a special csv format. We expect a csv file where each
1522 * line is a date point, and the first field in each line is the date string.
1523 * We also expect that all remaining fields represent series.
285a6bda 1524 * if the errorBars attribute is set, then interpret the fields as:
6a1aa64f
DV
1525 * date, series1, stddev1, series2, stddev2, ...
1526 * @param {Array.<Object>} data See above.
1527 * @private
285a6bda
DV
1528 *
1529 * @return Array.<Object> An array with one entry for each row. These entries
1530 * are an array of cells in that row. The first entry is the parsed x-value for
1531 * the row. The second, third, etc. are the y-values. These can take on one of
1532 * three forms, depending on the CSV and constructor parameters:
1533 * 1. numeric value
1534 * 2. [ value, stddev ]
1535 * 3. [ low value, center value, high value ]
6a1aa64f 1536 */
285a6bda 1537Dygraph.prototype.parseCSV_ = function(data) {
6a1aa64f
DV
1538 var ret = [];
1539 var lines = data.split("\n");
3d67f03b
DV
1540
1541 // Use the default delimiter or fall back to a tab if that makes sense.
1542 var delim = this.attr_('delimiter');
1543 if (lines[0].indexOf(delim) == -1 && lines[0].indexOf('\t') >= 0) {
1544 delim = '\t';
1545 }
1546
285a6bda 1547 var start = 0;
6a1aa64f 1548 if (this.labelsFromCSV_) {
285a6bda 1549 start = 1;
3d67f03b 1550 this.attrs_.labels = lines[0].split(delim);
6a1aa64f
DV
1551 }
1552
285a6bda
DV
1553 var xParser;
1554 var defaultParserSet = false; // attempt to auto-detect x value type
1555 var expectedCols = this.attr_("labels").length;
987840a2 1556 var outOfOrder = false;
6a1aa64f
DV
1557 for (var i = start; i < lines.length; i++) {
1558 var line = lines[i];
1559 if (line.length == 0) continue; // skip blank lines
3d67f03b
DV
1560 if (line[0] == '#') continue; // skip comment lines
1561 var inFields = line.split(delim);
285a6bda 1562 if (inFields.length < 2) continue;
6a1aa64f
DV
1563
1564 var fields = [];
285a6bda
DV
1565 if (!defaultParserSet) {
1566 this.detectTypeFromString_(inFields[0]);
1567 xParser = this.attr_("xValueParser");
1568 defaultParserSet = true;
1569 }
1570 fields[0] = xParser(inFields[0], this);
6a1aa64f
DV
1571
1572 // If fractions are expected, parse the numbers as "A/B"
1573 if (this.fractions_) {
1574 for (var j = 1; j < inFields.length; j++) {
1575 // TODO(danvk): figure out an appropriate way to flag parse errors.
1576 var vals = inFields[j].split("/");
1577 fields[j] = [parseFloat(vals[0]), parseFloat(vals[1])];
1578 }
285a6bda 1579 } else if (this.attr_("errorBars")) {
6a1aa64f
DV
1580 // If there are error bars, values are (value, stddev) pairs
1581 for (var j = 1; j < inFields.length; j += 2)
1582 fields[(j + 1) / 2] = [parseFloat(inFields[j]),
1583 parseFloat(inFields[j + 1])];
9922b78b 1584 } else if (this.attr_("customBars")) {
6a1aa64f
DV
1585 // Bars are a low;center;high tuple
1586 for (var j = 1; j < inFields.length; j++) {
1587 var vals = inFields[j].split(";");
1588 fields[j] = [ parseFloat(vals[0]),
1589 parseFloat(vals[1]),
1590 parseFloat(vals[2]) ];
1591 }
1592 } else {
1593 // Values are just numbers
285a6bda 1594 for (var j = 1; j < inFields.length; j++) {
6a1aa64f 1595 fields[j] = parseFloat(inFields[j]);
285a6bda 1596 }
6a1aa64f 1597 }
987840a2
DV
1598 if (ret.length > 0 && fields[0] < ret[ret.length - 1][0]) {
1599 outOfOrder = true;
1600 }
6a1aa64f 1601 ret.push(fields);
285a6bda
DV
1602
1603 if (fields.length != expectedCols) {
1604 this.error("Number of columns in line " + i + " (" + fields.length +
1605 ") does not agree with number of labels (" + expectedCols +
1606 ") " + line);
1607 }
6a1aa64f 1608 }
987840a2
DV
1609
1610 if (outOfOrder) {
1611 this.warn("CSV is out of order; order it correctly to speed loading.");
1612 ret.sort(function(a,b) { return a[0] - b[0] });
1613 }
1614
6a1aa64f
DV
1615 return ret;
1616};
1617
1618/**
285a6bda
DV
1619 * The user has provided their data as a pre-packaged JS array. If the x values
1620 * are numeric, this is the same as dygraphs' internal format. If the x values
1621 * are dates, we need to convert them from Date objects to ms since epoch.
1622 * @param {Array.<Object>} data
1623 * @return {Array.<Object>} data with numeric x values.
1624 */
1625Dygraph.prototype.parseArray_ = function(data) {
1626 // Peek at the first x value to see if it's numeric.
1627 if (data.length == 0) {
1628 this.error("Can't plot empty data set");
1629 return null;
1630 }
1631 if (data[0].length == 0) {
1632 this.error("Data set cannot contain an empty row");
1633 return null;
1634 }
1635
1636 if (this.attr_("labels") == null) {
1637 this.warn("Using default labels. Set labels explicitly via 'labels' " +
1638 "in the options parameter");
1639 this.attrs_.labels = [ "X" ];
1640 for (var i = 1; i < data[0].length; i++) {
1641 this.attrs_.labels.push("Y" + i);
1642 }
1643 }
1644
2dda3850 1645 if (Dygraph.isDateLike(data[0][0])) {
285a6bda
DV
1646 // Some intelligent defaults for a date x-axis.
1647 this.attrs_.xValueFormatter = Dygraph.dateString_;
1648 this.attrs_.xTicker = Dygraph.dateTicker;
1649
1650 // Assume they're all dates.
e3ab7b40 1651 var parsedData = Dygraph.clone(data);
285a6bda
DV
1652 for (var i = 0; i < data.length; i++) {
1653 if (parsedData[i].length == 0) {
1654 this.error("Row " << (1 + i) << " of data is empty");
1655 return null;
1656 }
1657 if (parsedData[i][0] == null
1658 || typeof(parsedData[i][0].getTime) != 'function') {
1659 this.error("x value in row " << (1 + i) << " is not a Date");
1660 return null;
1661 }
1662 parsedData[i][0] = parsedData[i][0].getTime();
1663 }
1664 return parsedData;
1665 } else {
1666 // Some intelligent defaults for a numeric x-axis.
1667 this.attrs_.xValueFormatter = function(x) { return x; };
1668 this.attrs_.xTicker = Dygraph.numericTicks;
1669 return data;
1670 }
1671};
1672
1673/**
79420a1e
DV
1674 * Parses a DataTable object from gviz.
1675 * The data is expected to have a first column that is either a date or a
1676 * number. All subsequent columns must be numbers. If there is a clear mismatch
1677 * between this.xValueParser_ and the type of the first column, it will be
1678 * fixed. Returned value is in the same format as return value of parseCSV_.
1679 * @param {Array.<Object>} data See above.
1680 * @private
1681 */
285a6bda 1682Dygraph.prototype.parseDataTable_ = function(data) {
79420a1e
DV
1683 var cols = data.getNumberOfColumns();
1684 var rows = data.getNumberOfRows();
1685
1686 // Read column labels
1687 var labels = [];
1688 for (var i = 0; i < cols; i++) {
1689 labels.push(data.getColumnLabel(i));
3e3f84e4 1690 if (i != 0 && this.attr_("errorBars")) i += 1;
79420a1e 1691 }
285a6bda 1692 this.attrs_.labels = labels;
3e3f84e4 1693 cols = labels.length;
79420a1e 1694
d955e223 1695 var indepType = data.getColumnType(0);
c21d2c2d 1696 if (indepType == 'date' || 'datetime') {
285a6bda
DV
1697 this.attrs_.xValueFormatter = Dygraph.dateString_;
1698 this.attrs_.xValueParser = Dygraph.dateParser;
1699 this.attrs_.xTicker = Dygraph.dateTicker;
33127159 1700 } else if (indepType == 'number') {
285a6bda
DV
1701 this.attrs_.xValueFormatter = function(x) { return x; };
1702 this.attrs_.xValueParser = function(x) { return parseFloat(x); };
1703 this.attrs_.xTicker = Dygraph.numericTicks;
1704 } else {
987840a2
DV
1705 this.error("only 'date', 'datetime' and 'number' types are supported for " +
1706 "column 1 of DataTable input (Got '" + indepType + "')");
79420a1e
DV
1707 return null;
1708 }
1709
1710 var ret = [];
987840a2 1711 var outOfOrder = false;
79420a1e
DV
1712 for (var i = 0; i < rows; i++) {
1713 var row = [];
debe4434
DV
1714 if (typeof(data.getValue(i, 0)) === 'undefined' ||
1715 data.getValue(i, 0) === null) {
1716 this.warning("Ignoring row " + i +
1717 " of DataTable because of undefined or null first column.");
1718 continue;
1719 }
1720
c21d2c2d 1721 if (indepType == 'date' || indepType == 'datetime') {
d955e223
DV
1722 row.push(data.getValue(i, 0).getTime());
1723 } else {
1724 row.push(data.getValue(i, 0));
1725 }
3e3f84e4
DV
1726 if (!this.attr_("errorBars")) {
1727 for (var j = 1; j < cols; j++) {
1728 row.push(data.getValue(i, j));
1729 }
1730 } else {
1731 for (var j = 0; j < cols - 1; j++) {
1732 row.push([ data.getValue(i, 1 + 2 * j), data.getValue(i, 2 + 2 * j) ]);
1733 }
79420a1e 1734 }
987840a2
DV
1735 if (ret.length > 0 && row[0] < ret[ret.length - 1][0]) {
1736 outOfOrder = true;
1737 }
243d96e8 1738 ret.push(row);
79420a1e 1739 }
987840a2
DV
1740
1741 if (outOfOrder) {
1742 this.warn("DataTable is out of order; order it correctly to speed loading.");
1743 ret.sort(function(a,b) { return a[0] - b[0] });
1744 }
79420a1e
DV
1745 return ret;
1746}
1747
24e5350c 1748// These functions are all based on MochiKit.
fc80a396
DV
1749Dygraph.update = function (self, o) {
1750 if (typeof(o) != 'undefined' && o !== null) {
1751 for (var k in o) {
85b99f0b
DV
1752 if (o.hasOwnProperty(k)) {
1753 self[k] = o[k];
1754 }
fc80a396
DV
1755 }
1756 }
1757 return self;
1758};
1759
2dda3850
DV
1760Dygraph.isArrayLike = function (o) {
1761 var typ = typeof(o);
1762 if (
c21d2c2d 1763 (typ != 'object' && !(typ == 'function' &&
2dda3850
DV
1764 typeof(o.item) == 'function')) ||
1765 o === null ||
1766 typeof(o.length) != 'number' ||
1767 o.nodeType === 3
1768 ) {
1769 return false;
1770 }
1771 return true;
1772};
1773
1774Dygraph.isDateLike = function (o) {
1775 if (typeof(o) != "object" || o === null ||
1776 typeof(o.getTime) != 'function') {
1777 return false;
1778 }
1779 return true;
1780};
1781
e3ab7b40
DV
1782Dygraph.clone = function(o) {
1783 // TODO(danvk): figure out how MochiKit's version works
1784 var r = [];
1785 for (var i = 0; i < o.length; i++) {
1786 if (Dygraph.isArrayLike(o[i])) {
1787 r.push(Dygraph.clone(o[i]));
1788 } else {
1789 r.push(o[i]);
1790 }
1791 }
1792 return r;
24e5350c
DV
1793};
1794
2dda3850 1795
79420a1e 1796/**
6a1aa64f
DV
1797 * Get the CSV data. If it's in a function, call that function. If it's in a
1798 * file, do an XMLHttpRequest to get it.
1799 * @private
1800 */
285a6bda 1801Dygraph.prototype.start_ = function() {
6a1aa64f 1802 if (typeof this.file_ == 'function') {
285a6bda 1803 // CSV string. Pretend we got it via XHR.
6a1aa64f 1804 this.loadedEvent_(this.file_());
2dda3850 1805 } else if (Dygraph.isArrayLike(this.file_)) {
285a6bda
DV
1806 this.rawData_ = this.parseArray_(this.file_);
1807 this.drawGraph_(this.rawData_);
79420a1e
DV
1808 } else if (typeof this.file_ == 'object' &&
1809 typeof this.file_.getColumnRange == 'function') {
1810 // must be a DataTable from gviz.
1811 this.rawData_ = this.parseDataTable_(this.file_);
1812 this.drawGraph_(this.rawData_);
285a6bda
DV
1813 } else if (typeof this.file_ == 'string') {
1814 // Heuristic: a newline means it's CSV data. Otherwise it's an URL.
1815 if (this.file_.indexOf('\n') >= 0) {
1816 this.loadedEvent_(this.file_);
1817 } else {
1818 var req = new XMLHttpRequest();
1819 var caller = this;
1820 req.onreadystatechange = function () {
1821 if (req.readyState == 4) {
1822 if (req.status == 200) {
1823 caller.loadedEvent_(req.responseText);
1824 }
6a1aa64f 1825 }
285a6bda 1826 };
6a1aa64f 1827
285a6bda
DV
1828 req.open("GET", this.file_, true);
1829 req.send(null);
1830 }
1831 } else {
1832 this.error("Unknown data format: " + (typeof this.file_));
6a1aa64f
DV
1833 }
1834};
1835
1836/**
1837 * Changes various properties of the graph. These can include:
1838 * <ul>
1839 * <li>file: changes the source data for the graph</li>
1840 * <li>errorBars: changes whether the data contains stddev</li>
1841 * </ul>
1842 * @param {Object} attrs The new properties and values
1843 */
285a6bda
DV
1844Dygraph.prototype.updateOptions = function(attrs) {
1845 // TODO(danvk): this is a mess. Rethink this function.
6a1aa64f
DV
1846 if (attrs.rollPeriod) {
1847 this.rollPeriod_ = attrs.rollPeriod;
1848 }
1849 if (attrs.dateWindow) {
1850 this.dateWindow_ = attrs.dateWindow;
1851 }
1852 if (attrs.valueRange) {
1853 this.valueRange_ = attrs.valueRange;
1854 }
fc80a396 1855 Dygraph.update(this.user_attrs_, attrs);
285a6bda
DV
1856
1857 this.labelsFromCSV_ = (this.attr_("labels") == null);
1858
1859 // TODO(danvk): this doesn't match the constructor logic
1860 this.layout_.updateOptions({ 'errorBars': this.attr_("errorBars") });
6a1aa64f
DV
1861 if (attrs['file'] && attrs['file'] != this.file_) {
1862 this.file_ = attrs['file'];
1863 this.start_();
1864 } else {
1865 this.drawGraph_(this.rawData_);
1866 }
1867};
1868
1869/**
697e70b2
DV
1870 * Resizes the dygraph. If no parameters are specified, resizes to fill the
1871 * containing div (which has presumably changed size since the dygraph was
1872 * instantiated. If the width/height are specified, the div will be resized.
964f30c6
DV
1873 *
1874 * This is far more efficient than destroying and re-instantiating a
1875 * Dygraph, since it doesn't have to reparse the underlying data.
1876 *
697e70b2
DV
1877 * @param {Number} width Width (in pixels)
1878 * @param {Number} height Height (in pixels)
1879 */
1880Dygraph.prototype.resize = function(width, height) {
1881 if ((width === null) != (height === null)) {
1882 this.warn("Dygraph.resize() should be called with zero parameters or " +
1883 "two non-NULL parameters. Pretending it was zero.");
1884 width = height = null;
1885 }
1886
b16e6369 1887 // TODO(danvk): there should be a clear() method.
697e70b2 1888 this.maindiv_.innerHTML = "";
b16e6369
DV
1889 this.attrs_.labelsDiv = null;
1890
697e70b2
DV
1891 if (width) {
1892 this.maindiv_.style.width = width + "px";
1893 this.maindiv_.style.height = height + "px";
1894 this.width_ = width;
1895 this.height_ = height;
1896 } else {
1897 this.width_ = this.maindiv_.offsetWidth;
1898 this.height_ = this.maindiv_.offsetHeight;
1899 }
1900
1901 this.createInterface_();
964f30c6 1902 this.drawGraph_(this.rawData_);
697e70b2
DV
1903};
1904
1905/**
6a1aa64f
DV
1906 * Adjusts the number of days in the rolling average. Updates the graph to
1907 * reflect the new averaging period.
1908 * @param {Number} length Number of days over which to average the data.
1909 */
285a6bda 1910Dygraph.prototype.adjustRoll = function(length) {
6a1aa64f
DV
1911 this.rollPeriod_ = length;
1912 this.drawGraph_(this.rawData_);
1913};
540d00f1 1914
f8cfec73 1915/**
1cf11047
DV
1916 * Returns a boolean array of visibility statuses.
1917 */
1918Dygraph.prototype.visibility = function() {
1919 // Do lazy-initialization, so that this happens after we know the number of
1920 // data series.
1921 if (!this.attr_("visibility")) {
f38dec01 1922 this.attrs_["visibility"] = [];
1cf11047
DV
1923 }
1924 while (this.attr_("visibility").length < this.rawData_[0].length - 1) {
f38dec01 1925 this.attr_("visibility").push(true);
1cf11047
DV
1926 }
1927 return this.attr_("visibility");
1928};
1929
1930/**
1931 * Changes the visiblity of a series.
1932 */
1933Dygraph.prototype.setVisibility = function(num, value) {
1934 var x = this.visibility();
1935 if (num < 0 && num >= x.length) {
1936 this.warn("invalid series number in setVisibility: " + num);
1937 } else {
1938 x[num] = value;
1939 this.drawGraph_(this.rawData_);
1940 }
1941};
1942
1943/**
f8cfec73
DV
1944 * Create a new canvas element. This is more complex than a simple
1945 * document.createElement("canvas") because of IE and excanvas.
1946 */
1947Dygraph.createCanvas = function() {
1948 var canvas = document.createElement("canvas");
1949
1950 isIE = (/MSIE/.test(navigator.userAgent) && !window.opera);
1951 if (isIE) {
1952 canvas = G_vmlCanvasManager.initElement(canvas);
1953 }
1954
1955 return canvas;
1956};
1957
540d00f1
DV
1958
1959/**
285a6bda 1960 * A wrapper around Dygraph that implements the gviz API.
540d00f1
DV
1961 * @param {Object} container The DOM object the visualization should live in.
1962 */
285a6bda 1963Dygraph.GVizChart = function(container) {
540d00f1
DV
1964 this.container = container;
1965}
1966
285a6bda 1967Dygraph.GVizChart.prototype.draw = function(data, options) {
540d00f1 1968 this.container.innerHTML = '';
285a6bda 1969 this.date_graph = new Dygraph(this.container, data, options);
540d00f1 1970}
285a6bda
DV
1971
1972// Older pages may still use this name.
1973DateGraph = Dygraph;