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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, | |
94 | ||
95 | strokeWidth: 1.0, | |
8e4a6af3 | 96 | |
8846615a DV |
97 | axisTickSize: 3, |
98 | axisLabelFontSize: 14, | |
99 | xAxisLabelWidth: 50, | |
100 | yAxisLabelWidth: 50, | |
101 | rightGap: 5, | |
285a6bda DV |
102 | |
103 | showRoller: false, | |
104 | xValueFormatter: Dygraph.dateString_, | |
105 | xValueParser: Dygraph.dateParser, | |
106 | xTicker: Dygraph.dateTicker, | |
107 | ||
108 | sigma: 2.0, | |
109 | errorBars: false, | |
110 | fractions: false, | |
111 | wilsonInterval: true, // only relevant if fractions is true | |
112 | customBars: false | |
113 | }; | |
114 | ||
115 | // Various logging levels. | |
116 | Dygraph.DEBUG = 1; | |
117 | Dygraph.INFO = 2; | |
118 | Dygraph.WARNING = 3; | |
119 | Dygraph.ERROR = 3; | |
120 | ||
121 | Dygraph.prototype.__old_init__ = function(div, file, labels, attrs) { | |
122 | // Labels is no longer a constructor parameter, since it's typically set | |
123 | // directly from the data source. It also conains a name for the x-axis, | |
124 | // which the previous constructor form did not. | |
125 | if (labels != null) { | |
126 | var new_labels = ["Date"]; | |
127 | for (var i = 0; i < labels.length; i++) new_labels.push(labels[i]); | |
128 | MochiKit.Base.update(attrs, { 'labels': new_labels }); | |
129 | } | |
130 | this.__init__(div, file, attrs); | |
8e4a6af3 DV |
131 | }; |
132 | ||
6a1aa64f | 133 | /** |
285a6bda | 134 | * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit |
6a1aa64f DV |
135 | * and interaction <canvas> inside of it. See the constructor for details |
136 | * on the parameters. | |
137 | * @param {String | Function} file Source data | |
138 | * @param {Array.<String>} labels Names of the data series | |
139 | * @param {Object} attrs Miscellaneous other options | |
140 | * @private | |
141 | */ | |
285a6bda DV |
142 | Dygraph.prototype.__init__ = function(div, file, attrs) { |
143 | // Support two-argument constructor | |
144 | if (attrs == null) { attrs = {}; } | |
145 | ||
6a1aa64f | 146 | // Copy the important bits into the object |
32988383 | 147 | // TODO(danvk): most of these should just stay in the attrs_ dictionary. |
6a1aa64f | 148 | this.maindiv_ = div; |
6a1aa64f | 149 | this.file_ = file; |
285a6bda | 150 | this.rollPeriod_ = attrs.rollPeriod || Dygraph.DEFAULT_ROLL_PERIOD; |
6a1aa64f | 151 | this.previousVerticalX_ = -1; |
6a1aa64f | 152 | this.fractions_ = attrs.fractions || false; |
6a1aa64f DV |
153 | this.dateWindow_ = attrs.dateWindow || null; |
154 | this.valueRange_ = attrs.valueRange || null; | |
6a1aa64f DV |
155 | this.wilsonInterval_ = attrs.wilsonInterval || true; |
156 | this.customBars_ = attrs.customBars || false; | |
8e4a6af3 | 157 | |
f7d6278e DV |
158 | // Clear the div. This ensure that, if multiple dygraphs are passed the same |
159 | // div, then only one will be drawn. | |
160 | div.innerHTML = ""; | |
161 | ||
285a6bda DV |
162 | // If the div isn't already sized then give it a default size. |
163 | if (div.style.width == '') { | |
164 | div.style.width = Dygraph.DEFAULT_WIDTH + "px"; | |
165 | } | |
166 | if (div.style.height == '') { | |
167 | div.style.height = Dygraph.DEFAULT_HEIGHT + "px"; | |
32988383 | 168 | } |
285a6bda DV |
169 | this.width_ = parseInt(div.style.width, 10); |
170 | this.height_ = parseInt(div.style.height, 10); | |
32988383 | 171 | |
285a6bda DV |
172 | // Dygraphs has many options, some of which interact with one another. |
173 | // To keep track of everything, we maintain two sets of options: | |
174 | // | |
175 | // this.user_attrs_ only options explicitly set by the user. | |
176 | // this.attrs_ defaults, options derived from user_attrs_, data. | |
177 | // | |
178 | // Options are then accessed this.attr_('attr'), which first looks at | |
179 | // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent | |
180 | // defaults without overriding behavior that the user specifically asks for. | |
181 | this.user_attrs_ = {}; | |
182 | MochiKit.Base.update(this.user_attrs_, attrs); | |
6a1aa64f | 183 | |
285a6bda DV |
184 | this.attrs_ = {}; |
185 | MochiKit.Base.update(this.attrs_, Dygraph.DEFAULT_ATTRS); | |
6a1aa64f | 186 | |
285a6bda DV |
187 | // Make a note of whether labels will be pulled from the CSV file. |
188 | this.labelsFromCSV_ = (this.attr_("labels") == null); | |
6a1aa64f DV |
189 | |
190 | // Create the containing DIV and other interactive elements | |
191 | this.createInterface_(); | |
192 | ||
193 | // Create the PlotKit grapher | |
285a6bda DV |
194 | // TODO(danvk): why does the Layout need its own set of options? |
195 | this.layoutOptions_ = { 'errorBars': (this.attr_("errorBars") || | |
196 | this.customBars_), | |
6a1aa64f | 197 | 'xOriginIsZero': false }; |
285a6bda DV |
198 | MochiKit.Base.update(this.layoutOptions_, this.attrs_); |
199 | MochiKit.Base.update(this.layoutOptions_, this.user_attrs_); | |
6a1aa64f | 200 | |
285a6bda | 201 | this.layout_ = new DygraphLayout(this.layoutOptions_); |
6a1aa64f | 202 | |
285a6bda | 203 | // TODO(danvk): why does the Renderer need its own set of options? |
6a1aa64f DV |
204 | this.renderOptions_ = { colorScheme: this.colors_, |
205 | strokeColor: null, | |
285a6bda DV |
206 | axisLineWidth: Dygraph.AXIS_LINE_WIDTH }; |
207 | MochiKit.Base.update(this.renderOptions_, this.attrs_); | |
208 | MochiKit.Base.update(this.renderOptions_, this.user_attrs_); | |
9317362d DV |
209 | this.plotter_ = new DygraphCanvasRenderer(this, |
210 | this.hidden_, this.layout_, | |
285a6bda | 211 | this.renderOptions_); |
6a1aa64f DV |
212 | |
213 | this.createStatusMessage_(); | |
214 | this.createRollInterface_(); | |
215 | this.createDragInterface_(); | |
216 | ||
738fc797 DV |
217 | // connect(window, 'onload', this, function(e) { this.start_(); }); |
218 | this.start_(); | |
6a1aa64f DV |
219 | }; |
220 | ||
285a6bda DV |
221 | Dygraph.prototype.attr_ = function(name) { |
222 | if (typeof(this.user_attrs_[name]) != 'undefined') { | |
223 | return this.user_attrs_[name]; | |
224 | } else if (typeof(this.attrs_[name]) != 'undefined') { | |
225 | return this.attrs_[name]; | |
226 | } else { | |
227 | return null; | |
228 | } | |
229 | }; | |
230 | ||
231 | // TODO(danvk): any way I can get the line numbers to be this.warn call? | |
232 | Dygraph.prototype.log = function(severity, message) { | |
233 | if (typeof(console) != 'undefined') { | |
234 | switch (severity) { | |
235 | case Dygraph.DEBUG: | |
236 | console.debug('dygraphs: ' + message); | |
237 | break; | |
238 | case Dygraph.INFO: | |
239 | console.info('dygraphs: ' + message); | |
240 | break; | |
241 | case Dygraph.WARNING: | |
242 | console.warn('dygraphs: ' + message); | |
243 | break; | |
244 | case Dygraph.ERROR: | |
245 | console.error('dygraphs: ' + message); | |
246 | break; | |
247 | } | |
248 | } | |
249 | } | |
250 | Dygraph.prototype.info = function(message) { | |
251 | this.log(Dygraph.INFO, message); | |
252 | } | |
253 | Dygraph.prototype.warn = function(message) { | |
254 | this.log(Dygraph.WARNING, message); | |
255 | } | |
256 | Dygraph.prototype.error = function(message) { | |
257 | this.log(Dygraph.ERROR, message); | |
258 | } | |
259 | ||
6a1aa64f DV |
260 | /** |
261 | * Returns the current rolling period, as set by the user or an option. | |
262 | * @return {Number} The number of days in the rolling window | |
263 | */ | |
285a6bda | 264 | Dygraph.prototype.rollPeriod = function() { |
6a1aa64f DV |
265 | return this.rollPeriod_; |
266 | } | |
267 | ||
268 | /** | |
285a6bda | 269 | * Generates interface elements for the Dygraph: a containing div, a div to |
6a1aa64f DV |
270 | * display the current point, and a textbox to adjust the rolling average |
271 | * period. | |
272 | * @private | |
273 | */ | |
285a6bda | 274 | Dygraph.prototype.createInterface_ = function() { |
6a1aa64f DV |
275 | // Create the all-enclosing graph div |
276 | var enclosing = this.maindiv_; | |
277 | ||
278 | this.graphDiv = MochiKit.DOM.DIV( { style: { 'width': this.width_ + "px", | |
279 | 'height': this.height_ + "px" | |
280 | }}); | |
281 | appendChildNodes(enclosing, this.graphDiv); | |
282 | ||
283 | // Create the canvas to store | |
8846615a DV |
284 | // We need to subtract out some space for the x- and y-axis labels. |
285 | // For the x-axis: | |
286 | // - remove from height: (axisTickSize + height of tick label) | |
287 | // height of tick label == axisLabelFontSize? | |
288 | // - remove from width: axisLabelWidth / 2 (maybe on both ends) | |
289 | // For the y-axis: | |
290 | // - remove axisLabelFontSize from the top | |
291 | // - remove axisTickSize from the left | |
292 | ||
6a1aa64f DV |
293 | var canvas = MochiKit.DOM.CANVAS; |
294 | this.canvas_ = canvas( { style: { 'position': 'absolute' }, | |
295 | width: this.width_, | |
8846615a DV |
296 | height: this.height_ |
297 | }); | |
6a1aa64f DV |
298 | appendChildNodes(this.graphDiv, this.canvas_); |
299 | ||
300 | this.hidden_ = this.createPlotKitCanvas_(this.canvas_); | |
301 | connect(this.hidden_, 'onmousemove', this, function(e) { this.mouseMove_(e) }); | |
302 | connect(this.hidden_, 'onmouseout', this, function(e) { this.mouseOut_(e) }); | |
303 | } | |
304 | ||
305 | /** | |
306 | * Creates the canvas containing the PlotKit graph. Only plotkit ever draws on | |
285a6bda | 307 | * this particular canvas. All Dygraph work is done on this.canvas_. |
8846615a | 308 | * @param {Object} canvas The Dygraph canvas over which to overlay the plot |
6a1aa64f DV |
309 | * @return {Object} The newly-created canvas |
310 | * @private | |
311 | */ | |
285a6bda | 312 | Dygraph.prototype.createPlotKitCanvas_ = function(canvas) { |
6a1aa64f DV |
313 | var h = document.createElement("canvas"); |
314 | h.style.position = "absolute"; | |
315 | h.style.top = canvas.style.top; | |
316 | h.style.left = canvas.style.left; | |
317 | h.width = this.width_; | |
318 | h.height = this.height_; | |
319 | MochiKit.DOM.appendChildNodes(this.graphDiv, h); | |
320 | return h; | |
321 | }; | |
322 | ||
323 | /** | |
324 | * Generate a set of distinct colors for the data series. This is done with a | |
325 | * color wheel. Saturation/Value are customizable, and the hue is | |
326 | * equally-spaced around the color wheel. If a custom set of colors is | |
327 | * specified, that is used instead. | |
6a1aa64f DV |
328 | * @private |
329 | */ | |
285a6bda DV |
330 | Dygraph.prototype.setColors_ = function() { |
331 | // TODO(danvk): compute this directly into this.attrs_['colorScheme'] and do | |
332 | // away with this.renderOptions_. | |
333 | var num = this.attr_("labels").length - 1; | |
6a1aa64f | 334 | this.colors_ = []; |
285a6bda DV |
335 | var colors = this.attr_('colors'); |
336 | if (!colors) { | |
337 | var sat = this.attr_('colorSaturation') || 1.0; | |
338 | var val = this.attr_('colorValue') || 0.5; | |
6a1aa64f DV |
339 | for (var i = 1; i <= num; i++) { |
340 | var hue = (1.0*i/(1+num)); | |
341 | this.colors_.push( MochiKit.Color.Color.fromHSV(hue, sat, val) ); | |
342 | } | |
343 | } else { | |
344 | for (var i = 0; i < num; i++) { | |
285a6bda | 345 | var colorStr = colors[i % colors.length]; |
6a1aa64f DV |
346 | this.colors_.push( MochiKit.Color.Color.fromString(colorStr) ); |
347 | } | |
348 | } | |
285a6bda DV |
349 | |
350 | // TODO(danvk): update this w/r/t/ the new options system. | |
351 | this.renderOptions_.colorScheme = this.colors_; | |
352 | MochiKit.Base.update(this.plotter_.options, this.renderOptions_); | |
353 | MochiKit.Base.update(this.layoutOptions_, this.user_attrs_); | |
354 | MochiKit.Base.update(this.layoutOptions_, this.attrs_); | |
6a1aa64f DV |
355 | } |
356 | ||
357 | /** | |
358 | * Create the div that contains information on the selected point(s) | |
359 | * This goes in the top right of the canvas, unless an external div has already | |
360 | * been specified. | |
361 | * @private | |
362 | */ | |
285a6bda DV |
363 | Dygraph.prototype.createStatusMessage_ = function(){ |
364 | if (!this.attr_("labelsDiv")) { | |
365 | var divWidth = this.attr_('labelsDivWidth'); | |
6a1aa64f DV |
366 | var messagestyle = { "style": { |
367 | "position": "absolute", | |
368 | "fontSize": "14px", | |
369 | "zIndex": 10, | |
370 | "width": divWidth + "px", | |
371 | "top": "0px", | |
8846615a | 372 | "left": (this.width_ - divWidth - 2) + "px", |
6a1aa64f DV |
373 | "background": "white", |
374 | "textAlign": "left", | |
375 | "overflow": "hidden"}}; | |
285a6bda DV |
376 | MochiKit.Base.update(messagestyle["style"], this.attr_('labelsDivStyles')); |
377 | var div = MochiKit.DOM.DIV(messagestyle); | |
378 | MochiKit.DOM.appendChildNodes(this.graphDiv, div); | |
379 | this.attrs_.labelsDiv = div; | |
6a1aa64f DV |
380 | } |
381 | }; | |
382 | ||
383 | /** | |
384 | * Create the text box to adjust the averaging period | |
385 | * @return {Object} The newly-created text box | |
386 | * @private | |
387 | */ | |
285a6bda | 388 | Dygraph.prototype.createRollInterface_ = function() { |
285a6bda | 389 | var display = this.attr_('showRoller') ? "block" : "none"; |
6a1aa64f DV |
390 | var textAttr = { "type": "text", |
391 | "size": "2", | |
392 | "value": this.rollPeriod_, | |
393 | "style": { "position": "absolute", | |
394 | "zIndex": 10, | |
8846615a DV |
395 | "top": (this.plotter_.area.h - 25) + "px", |
396 | "left": (this.plotter_.area.x + 1) + "px", | |
738fc797 | 397 | "display": display } |
6a1aa64f DV |
398 | }; |
399 | var roller = MochiKit.DOM.INPUT(textAttr); | |
400 | var pa = this.graphDiv; | |
401 | MochiKit.DOM.appendChildNodes(pa, roller); | |
402 | connect(roller, 'onchange', this, | |
403 | function() { this.adjustRoll(roller.value); }); | |
404 | return roller; | |
405 | } | |
406 | ||
407 | /** | |
408 | * Set up all the mouse handlers needed to capture dragging behavior for zoom | |
409 | * events. Uses MochiKit.Signal to attach all the event handlers. | |
410 | * @private | |
411 | */ | |
285a6bda | 412 | Dygraph.prototype.createDragInterface_ = function() { |
6a1aa64f DV |
413 | var self = this; |
414 | ||
415 | // Tracks whether the mouse is down right now | |
416 | var mouseDown = false; | |
417 | var dragStartX = null; | |
418 | var dragStartY = null; | |
419 | var dragEndX = null; | |
420 | var dragEndY = null; | |
421 | var prevEndX = null; | |
422 | ||
423 | // Utility function to convert page-wide coordinates to canvas coords | |
67e650dc DV |
424 | var px = 0; |
425 | var py = 0; | |
6a1aa64f DV |
426 | var getX = function(e) { return e.mouse().page.x - px }; |
427 | var getY = function(e) { return e.mouse().page.y - py }; | |
428 | ||
429 | // Draw zoom rectangles when the mouse is down and the user moves around | |
430 | connect(this.hidden_, 'onmousemove', function(event) { | |
431 | if (mouseDown) { | |
432 | dragEndX = getX(event); | |
433 | dragEndY = getY(event); | |
434 | ||
435 | self.drawZoomRect_(dragStartX, dragEndX, prevEndX); | |
436 | prevEndX = dragEndX; | |
437 | } | |
438 | }); | |
439 | ||
440 | // Track the beginning of drag events | |
441 | connect(this.hidden_, 'onmousedown', function(event) { | |
442 | mouseDown = true; | |
67e650dc DV |
443 | px = PlotKit.Base.findPosX(self.canvas_); |
444 | py = PlotKit.Base.findPosY(self.canvas_); | |
6a1aa64f DV |
445 | dragStartX = getX(event); |
446 | dragStartY = getY(event); | |
447 | }); | |
448 | ||
449 | // If the user releases the mouse button during a drag, but not over the | |
450 | // canvas, then it doesn't count as a zooming action. | |
451 | connect(document, 'onmouseup', this, function(event) { | |
452 | if (mouseDown) { | |
453 | mouseDown = false; | |
454 | dragStartX = null; | |
455 | dragStartY = null; | |
456 | } | |
457 | }); | |
458 | ||
459 | // Temporarily cancel the dragging event when the mouse leaves the graph | |
460 | connect(this.hidden_, 'onmouseout', this, function(event) { | |
461 | if (mouseDown) { | |
462 | dragEndX = null; | |
463 | dragEndY = null; | |
464 | } | |
465 | }); | |
466 | ||
467 | // If the mouse is released on the canvas during a drag event, then it's a | |
468 | // zoom. Only do the zoom if it's over a large enough area (>= 10 pixels) | |
469 | connect(this.hidden_, 'onmouseup', this, function(event) { | |
470 | if (mouseDown) { | |
471 | mouseDown = false; | |
472 | dragEndX = getX(event); | |
473 | dragEndY = getY(event); | |
474 | var regionWidth = Math.abs(dragEndX - dragStartX); | |
475 | var regionHeight = Math.abs(dragEndY - dragStartY); | |
476 | ||
477 | if (regionWidth < 2 && regionHeight < 2 && | |
285a6bda | 478 | self.attr_('clickCallback') != null && |
6a1aa64f | 479 | self.lastx_ != undefined) { |
285a6bda DV |
480 | // TODO(danvk): pass along more info about the point. |
481 | self.attr_('clickCallback')(event, new Date(self.lastx_)); | |
6a1aa64f DV |
482 | } |
483 | ||
484 | if (regionWidth >= 10) { | |
485 | self.doZoom_(Math.min(dragStartX, dragEndX), | |
486 | Math.max(dragStartX, dragEndX)); | |
487 | } else { | |
488 | self.canvas_.getContext("2d").clearRect(0, 0, | |
489 | self.canvas_.width, | |
490 | self.canvas_.height); | |
491 | } | |
492 | ||
493 | dragStartX = null; | |
494 | dragStartY = null; | |
495 | } | |
496 | }); | |
497 | ||
498 | // Double-clicking zooms back out | |
499 | connect(this.hidden_, 'ondblclick', this, function(event) { | |
500 | self.dateWindow_ = null; | |
501 | self.drawGraph_(self.rawData_); | |
502 | var minDate = self.rawData_[0][0]; | |
503 | var maxDate = self.rawData_[self.rawData_.length - 1][0]; | |
285a6bda DV |
504 | if (self.attr_("zoomCallback")) { |
505 | self.attr_("zoomCallback")(minDate, maxDate); | |
67e650dc | 506 | } |
6a1aa64f DV |
507 | }); |
508 | }; | |
509 | ||
510 | /** | |
511 | * Draw a gray zoom rectangle over the desired area of the canvas. Also clears | |
512 | * up any previous zoom rectangles that were drawn. This could be optimized to | |
513 | * avoid extra redrawing, but it's tricky to avoid interactions with the status | |
514 | * dots. | |
515 | * @param {Number} startX The X position where the drag started, in canvas | |
516 | * coordinates. | |
517 | * @param {Number} endX The current X position of the drag, in canvas coords. | |
518 | * @param {Number} prevEndX The value of endX on the previous call to this | |
519 | * function. Used to avoid excess redrawing | |
520 | * @private | |
521 | */ | |
285a6bda | 522 | Dygraph.prototype.drawZoomRect_ = function(startX, endX, prevEndX) { |
6a1aa64f DV |
523 | var ctx = this.canvas_.getContext("2d"); |
524 | ||
525 | // Clean up from the previous rect if necessary | |
526 | if (prevEndX) { | |
527 | ctx.clearRect(Math.min(startX, prevEndX), 0, | |
528 | Math.abs(startX - prevEndX), this.height_); | |
529 | } | |
530 | ||
531 | // Draw a light-grey rectangle to show the new viewing area | |
532 | if (endX && startX) { | |
533 | ctx.fillStyle = "rgba(128,128,128,0.33)"; | |
534 | ctx.fillRect(Math.min(startX, endX), 0, | |
535 | Math.abs(endX - startX), this.height_); | |
536 | } | |
537 | }; | |
538 | ||
539 | /** | |
540 | * Zoom to something containing [lowX, highX]. These are pixel coordinates | |
541 | * in the canvas. The exact zoom window may be slightly larger if there are no | |
542 | * data points near lowX or highX. This function redraws the graph. | |
543 | * @param {Number} lowX The leftmost pixel value that should be visible. | |
544 | * @param {Number} highX The rightmost pixel value that should be visible. | |
545 | * @private | |
546 | */ | |
285a6bda | 547 | Dygraph.prototype.doZoom_ = function(lowX, highX) { |
6a1aa64f DV |
548 | // Find the earliest and latest dates contained in this canvasx range. |
549 | var points = this.layout_.points; | |
550 | var minDate = null; | |
551 | var maxDate = null; | |
552 | // Find the nearest [minDate, maxDate] that contains [lowX, highX] | |
553 | for (var i = 0; i < points.length; i++) { | |
554 | var cx = points[i].canvasx; | |
555 | var x = points[i].xval; | |
556 | if (cx < lowX && (minDate == null || x > minDate)) minDate = x; | |
557 | if (cx > highX && (maxDate == null || x < maxDate)) maxDate = x; | |
558 | } | |
559 | // Use the extremes if either is missing | |
560 | if (minDate == null) minDate = points[0].xval; | |
561 | if (maxDate == null) maxDate = points[points.length-1].xval; | |
562 | ||
563 | this.dateWindow_ = [minDate, maxDate]; | |
564 | this.drawGraph_(this.rawData_); | |
285a6bda DV |
565 | if (this.attr_("zoomCallback")) { |
566 | this.attr_("zoomCallback")(minDate, maxDate); | |
67e650dc | 567 | } |
6a1aa64f DV |
568 | }; |
569 | ||
570 | /** | |
571 | * When the mouse moves in the canvas, display information about a nearby data | |
572 | * point and draw dots over those points in the data series. This function | |
573 | * takes care of cleanup of previously-drawn dots. | |
574 | * @param {Object} event The mousemove event from the browser. | |
575 | * @private | |
576 | */ | |
285a6bda | 577 | Dygraph.prototype.mouseMove_ = function(event) { |
6a1aa64f DV |
578 | var canvasx = event.mouse().page.x - PlotKit.Base.findPosX(this.hidden_); |
579 | var points = this.layout_.points; | |
580 | ||
581 | var lastx = -1; | |
582 | var lasty = -1; | |
583 | ||
584 | // Loop through all the points and find the date nearest to our current | |
585 | // location. | |
586 | var minDist = 1e+100; | |
587 | var idx = -1; | |
588 | for (var i = 0; i < points.length; i++) { | |
589 | var dist = Math.abs(points[i].canvasx - canvasx); | |
590 | if (dist > minDist) break; | |
591 | minDist = dist; | |
592 | idx = i; | |
593 | } | |
594 | if (idx >= 0) lastx = points[idx].xval; | |
595 | // Check that you can really highlight the last day's data | |
596 | if (canvasx > points[points.length-1].canvasx) | |
597 | lastx = points[points.length-1].xval; | |
598 | ||
599 | // Extract the points we've selected | |
600 | var selPoints = []; | |
601 | for (var i = 0; i < points.length; i++) { | |
602 | if (points[i].xval == lastx) { | |
603 | selPoints.push(points[i]); | |
604 | } | |
605 | } | |
606 | ||
607 | // Clear the previously drawn vertical, if there is one | |
285a6bda | 608 | var circleSize = this.attr_('highlightCircleSize'); |
6a1aa64f DV |
609 | var ctx = this.canvas_.getContext("2d"); |
610 | if (this.previousVerticalX_ >= 0) { | |
611 | var px = this.previousVerticalX_; | |
612 | ctx.clearRect(px - circleSize - 1, 0, 2 * circleSize + 2, this.height_); | |
613 | } | |
614 | ||
584ceeaa DV |
615 | var isOK = function(x) { return x && !isNaN(x); }; |
616 | ||
6a1aa64f DV |
617 | if (selPoints.length > 0) { |
618 | var canvasx = selPoints[0].canvasx; | |
619 | ||
620 | // Set the status message to indicate the selected point(s) | |
285a6bda | 621 | var replace = this.attr_('xValueFormatter')(lastx, this) + ":"; |
6a1aa64f DV |
622 | var clen = this.colors_.length; |
623 | for (var i = 0; i < selPoints.length; i++) { | |
584ceeaa | 624 | if (!isOK(selPoints[i].canvasy)) continue; |
285a6bda | 625 | if (this.attr_("labelsSeparateLines")) { |
6a1aa64f DV |
626 | replace += "<br/>"; |
627 | } | |
628 | var point = selPoints[i]; | |
629 | replace += " <b><font color='" + this.colors_[i%clen].toHexString() + "'>" | |
630 | + point.name + "</font></b>:" | |
631 | + this.round_(point.yval, 2); | |
632 | } | |
285a6bda | 633 | this.attr_("labelsDiv").innerHTML = replace; |
6a1aa64f DV |
634 | |
635 | // Save last x position for callbacks. | |
636 | this.lastx_ = lastx; | |
637 | ||
638 | // Draw colored circles over the center of each selected point | |
639 | ctx.save() | |
640 | for (var i = 0; i < selPoints.length; i++) { | |
584ceeaa | 641 | if (!isOK(selPoints[i%clen].canvasy)) continue; |
6a1aa64f DV |
642 | ctx.beginPath(); |
643 | ctx.fillStyle = this.colors_[i%clen].toRGBString(); | |
644 | ctx.arc(canvasx, selPoints[i%clen].canvasy, circleSize, 0, 360, false); | |
645 | ctx.fill(); | |
646 | } | |
647 | ctx.restore(); | |
648 | ||
649 | this.previousVerticalX_ = canvasx; | |
650 | } | |
651 | }; | |
652 | ||
653 | /** | |
654 | * The mouse has left the canvas. Clear out whatever artifacts remain | |
655 | * @param {Object} event the mouseout event from the browser. | |
656 | * @private | |
657 | */ | |
285a6bda | 658 | Dygraph.prototype.mouseOut_ = function(event) { |
6a1aa64f DV |
659 | // Get rid of the overlay data |
660 | var ctx = this.canvas_.getContext("2d"); | |
661 | ctx.clearRect(0, 0, this.width_, this.height_); | |
285a6bda | 662 | this.attr_("labelsDiv").innerHTML = ""; |
6a1aa64f DV |
663 | }; |
664 | ||
285a6bda | 665 | Dygraph.zeropad = function(x) { |
32988383 DV |
666 | if (x < 10) return "0" + x; else return "" + x; |
667 | } | |
668 | ||
6a1aa64f | 669 | /** |
6b8e33dd DV |
670 | * Return a string version of the hours, minutes and seconds portion of a date. |
671 | * @param {Number} date The JavaScript date (ms since epoch) | |
672 | * @return {String} A time of the form "HH:MM:SS" | |
673 | * @private | |
674 | */ | |
285a6bda DV |
675 | Dygraph.prototype.hmsString_ = function(date) { |
676 | var zeropad = Dygraph.zeropad; | |
6b8e33dd DV |
677 | var d = new Date(date); |
678 | if (d.getSeconds()) { | |
679 | return zeropad(d.getHours()) + ":" + | |
680 | zeropad(d.getMinutes()) + ":" + | |
681 | zeropad(d.getSeconds()); | |
682 | } else if (d.getMinutes()) { | |
683 | return zeropad(d.getHours()) + ":" + zeropad(d.getMinutes()); | |
684 | } else { | |
685 | return zeropad(d.getHours()); | |
686 | } | |
687 | } | |
688 | ||
689 | /** | |
6a1aa64f DV |
690 | * Convert a JS date (millis since epoch) to YYYY/MM/DD |
691 | * @param {Number} date The JavaScript date (ms since epoch) | |
692 | * @return {String} A date of the form "YYYY/MM/DD" | |
693 | * @private | |
285a6bda | 694 | * TODO(danvk): why is this part of the prototype? |
6a1aa64f | 695 | */ |
285a6bda DV |
696 | Dygraph.dateString_ = function(date, self) { |
697 | var zeropad = Dygraph.zeropad; | |
6a1aa64f DV |
698 | var d = new Date(date); |
699 | ||
700 | // Get the year: | |
701 | var year = "" + d.getFullYear(); | |
702 | // Get a 0 padded month string | |
6b8e33dd | 703 | var month = zeropad(d.getMonth() + 1); //months are 0-offset, sigh |
6a1aa64f | 704 | // Get a 0 padded day string |
6b8e33dd | 705 | var day = zeropad(d.getDate()); |
6a1aa64f | 706 | |
6b8e33dd DV |
707 | var ret = ""; |
708 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); | |
285a6bda | 709 | if (frac) ret = " " + self.hmsString_(date); |
6b8e33dd DV |
710 | |
711 | return year + "/" + month + "/" + day + ret; | |
6a1aa64f DV |
712 | }; |
713 | ||
714 | /** | |
715 | * Round a number to the specified number of digits past the decimal point. | |
716 | * @param {Number} num The number to round | |
717 | * @param {Number} places The number of decimals to which to round | |
718 | * @return {Number} The rounded number | |
719 | * @private | |
720 | */ | |
285a6bda | 721 | Dygraph.prototype.round_ = function(num, places) { |
6a1aa64f DV |
722 | var shift = Math.pow(10, places); |
723 | return Math.round(num * shift)/shift; | |
724 | }; | |
725 | ||
726 | /** | |
727 | * Fires when there's data available to be graphed. | |
728 | * @param {String} data Raw CSV data to be plotted | |
729 | * @private | |
730 | */ | |
285a6bda | 731 | Dygraph.prototype.loadedEvent_ = function(data) { |
6a1aa64f DV |
732 | this.rawData_ = this.parseCSV_(data); |
733 | this.drawGraph_(this.rawData_); | |
734 | }; | |
735 | ||
285a6bda | 736 | Dygraph.prototype.months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", |
8846615a | 737 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; |
285a6bda | 738 | Dygraph.prototype.quarters = ["Jan", "Apr", "Jul", "Oct"]; |
6a1aa64f DV |
739 | |
740 | /** | |
741 | * Add ticks on the x-axis representing years, months, quarters, weeks, or days | |
742 | * @private | |
743 | */ | |
285a6bda | 744 | Dygraph.prototype.addXTicks_ = function() { |
6a1aa64f DV |
745 | // Determine the correct ticks scale on the x-axis: quarterly, monthly, ... |
746 | var startDate, endDate; | |
747 | if (this.dateWindow_) { | |
748 | startDate = this.dateWindow_[0]; | |
749 | endDate = this.dateWindow_[1]; | |
750 | } else { | |
751 | startDate = this.rawData_[0][0]; | |
752 | endDate = this.rawData_[this.rawData_.length - 1][0]; | |
753 | } | |
754 | ||
285a6bda | 755 | var xTicks = this.attr_('xTicker')(startDate, endDate, this); |
6a1aa64f | 756 | this.layout_.updateOptions({xTicks: xTicks}); |
32988383 DV |
757 | }; |
758 | ||
759 | // Time granularity enumeration | |
285a6bda DV |
760 | Dygraph.SECONDLY = 0; |
761 | Dygraph.TEN_SECONDLY = 1; | |
762 | Dygraph.THIRTY_SECONDLY = 2; | |
763 | Dygraph.MINUTELY = 3; | |
764 | Dygraph.TEN_MINUTELY = 4; | |
765 | Dygraph.THIRTY_MINUTELY = 5; | |
766 | Dygraph.HOURLY = 6; | |
767 | Dygraph.SIX_HOURLY = 7; | |
768 | Dygraph.DAILY = 8; | |
769 | Dygraph.WEEKLY = 9; | |
770 | Dygraph.MONTHLY = 10; | |
771 | Dygraph.QUARTERLY = 11; | |
772 | Dygraph.BIANNUAL = 12; | |
773 | Dygraph.ANNUAL = 13; | |
774 | Dygraph.DECADAL = 14; | |
775 | Dygraph.NUM_GRANULARITIES = 15; | |
776 | ||
777 | Dygraph.SHORT_SPACINGS = []; | |
778 | Dygraph.SHORT_SPACINGS[Dygraph.SECONDLY] = 1000 * 1; | |
779 | Dygraph.SHORT_SPACINGS[Dygraph.TEN_SECONDLY] = 1000 * 10; | |
780 | Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_SECONDLY] = 1000 * 30; | |
781 | Dygraph.SHORT_SPACINGS[Dygraph.MINUTELY] = 1000 * 60; | |
782 | Dygraph.SHORT_SPACINGS[Dygraph.TEN_MINUTELY] = 1000 * 60 * 10; | |
783 | Dygraph.SHORT_SPACINGS[Dygraph.THIRTY_MINUTELY] = 1000 * 60 * 30; | |
784 | Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600; | |
785 | Dygraph.SHORT_SPACINGS[Dygraph.HOURLY] = 1000 * 3600 * 6; | |
786 | Dygraph.SHORT_SPACINGS[Dygraph.DAILY] = 1000 * 86400; | |
787 | Dygraph.SHORT_SPACINGS[Dygraph.WEEKLY] = 1000 * 604800; | |
32988383 DV |
788 | |
789 | // NumXTicks() | |
790 | // | |
791 | // If we used this time granularity, how many ticks would there be? | |
792 | // This is only an approximation, but it's generally good enough. | |
793 | // | |
285a6bda DV |
794 | Dygraph.prototype.NumXTicks = function(start_time, end_time, granularity) { |
795 | if (granularity < Dygraph.MONTHLY) { | |
32988383 | 796 | // Generate one tick mark for every fixed interval of time. |
285a6bda | 797 | var spacing = Dygraph.SHORT_SPACINGS[granularity]; |
32988383 DV |
798 | return Math.floor(0.5 + 1.0 * (end_time - start_time) / spacing); |
799 | } else { | |
800 | var year_mod = 1; // e.g. to only print one point every 10 years. | |
801 | var num_months = 12; | |
285a6bda DV |
802 | if (granularity == Dygraph.QUARTERLY) num_months = 3; |
803 | if (granularity == Dygraph.BIANNUAL) num_months = 2; | |
804 | if (granularity == Dygraph.ANNUAL) num_months = 1; | |
805 | if (granularity == Dygraph.DECADAL) { num_months = 1; year_mod = 10; } | |
32988383 DV |
806 | |
807 | var msInYear = 365.2524 * 24 * 3600 * 1000; | |
808 | var num_years = 1.0 * (end_time - start_time) / msInYear; | |
809 | return Math.floor(0.5 + 1.0 * num_years * num_months / year_mod); | |
810 | } | |
811 | }; | |
812 | ||
813 | // GetXAxis() | |
814 | // | |
815 | // Construct an x-axis of nicely-formatted times on meaningful boundaries | |
816 | // (e.g. 'Jan 09' rather than 'Jan 22, 2009'). | |
817 | // | |
818 | // Returns an array containing {v: millis, label: label} dictionaries. | |
819 | // | |
285a6bda | 820 | Dygraph.prototype.GetXAxis = function(start_time, end_time, granularity) { |
32988383 | 821 | var ticks = []; |
285a6bda | 822 | if (granularity < Dygraph.MONTHLY) { |
32988383 | 823 | // Generate one tick mark for every fixed interval of time. |
285a6bda | 824 | var spacing = Dygraph.SHORT_SPACINGS[granularity]; |
32988383 | 825 | var format = '%d%b'; // e.g. "1 Jan" |
328bb812 | 826 | // TODO(danvk): be smarter about making sure this really hits a "nice" time. |
285a6bda | 827 | if (granularity < Dygraph.HOURLY) { |
328bb812 DV |
828 | start_time = spacing * Math.floor(0.5 + start_time / spacing); |
829 | } | |
32988383 DV |
830 | for (var t = start_time; t <= end_time; t += spacing) { |
831 | var d = new Date(t); | |
832 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); | |
285a6bda | 833 | if (frac == 0 || granularity >= Dygraph.DAILY) { |
32988383 DV |
834 | // the extra hour covers DST problems. |
835 | ticks.push({ v:t, label: new Date(t + 3600*1000).strftime(format) }); | |
836 | } else { | |
837 | ticks.push({ v:t, label: this.hmsString_(t) }); | |
838 | } | |
839 | } | |
840 | } else { | |
841 | // Display a tick mark on the first of a set of months of each year. | |
842 | // Years get a tick mark iff y % year_mod == 0. This is useful for | |
843 | // displaying a tick mark once every 10 years, say, on long time scales. | |
844 | var months; | |
845 | var year_mod = 1; // e.g. to only print one point every 10 years. | |
846 | ||
285a6bda | 847 | if (granularity == Dygraph.MONTHLY) { |
32988383 | 848 | months = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ]; |
285a6bda | 849 | } else if (granularity == Dygraph.QUARTERLY) { |
32988383 | 850 | months = [ 0, 3, 6, 9 ]; |
285a6bda | 851 | } else if (granularity == Dygraph.BIANNUAL) { |
32988383 | 852 | months = [ 0, 6 ]; |
285a6bda | 853 | } else if (granularity == Dygraph.ANNUAL) { |
32988383 | 854 | months = [ 0 ]; |
285a6bda | 855 | } else if (granularity == Dygraph.DECADAL) { |
32988383 DV |
856 | months = [ 0 ]; |
857 | year_mod = 10; | |
858 | } | |
859 | ||
860 | var start_year = new Date(start_time).getFullYear(); | |
861 | var end_year = new Date(end_time).getFullYear(); | |
285a6bda | 862 | var zeropad = Dygraph.zeropad; |
32988383 DV |
863 | for (var i = start_year; i <= end_year; i++) { |
864 | if (i % year_mod != 0) continue; | |
865 | for (var j = 0; j < months.length; j++) { | |
866 | var date_str = i + "/" + zeropad(1 + months[j]) + "/01"; | |
867 | var t = Date.parse(date_str); | |
868 | if (t < start_time || t > end_time) continue; | |
869 | ticks.push({ v:t, label: new Date(t).strftime('%b %y') }); | |
870 | } | |
871 | } | |
872 | } | |
873 | ||
874 | return ticks; | |
875 | }; | |
876 | ||
6a1aa64f DV |
877 | |
878 | /** | |
879 | * Add ticks to the x-axis based on a date range. | |
880 | * @param {Number} startDate Start of the date window (millis since epoch) | |
881 | * @param {Number} endDate End of the date window (millis since epoch) | |
882 | * @return {Array.<Object>} Array of {label, value} tuples. | |
883 | * @public | |
884 | */ | |
285a6bda | 885 | Dygraph.dateTicker = function(startDate, endDate, self) { |
32988383 | 886 | var chosen = -1; |
285a6bda DV |
887 | for (var i = 0; i < Dygraph.NUM_GRANULARITIES; i++) { |
888 | var num_ticks = self.NumXTicks(startDate, endDate, i); | |
889 | if (self.width_ / num_ticks >= self.attr_('pixelsPerXLabel')) { | |
32988383 DV |
890 | chosen = i; |
891 | break; | |
2769de62 | 892 | } |
6a1aa64f DV |
893 | } |
894 | ||
32988383 | 895 | if (chosen >= 0) { |
285a6bda | 896 | return self.GetXAxis(startDate, endDate, chosen); |
6a1aa64f | 897 | } else { |
32988383 | 898 | // TODO(danvk): signal error. |
6a1aa64f | 899 | } |
6a1aa64f DV |
900 | }; |
901 | ||
902 | /** | |
903 | * Add ticks when the x axis has numbers on it (instead of dates) | |
904 | * @param {Number} startDate Start of the date window (millis since epoch) | |
905 | * @param {Number} endDate End of the date window (millis since epoch) | |
906 | * @return {Array.<Object>} Array of {label, value} tuples. | |
907 | * @public | |
908 | */ | |
285a6bda | 909 | Dygraph.numericTicks = function(minV, maxV, self) { |
c6336f04 DV |
910 | // Basic idea: |
911 | // Try labels every 1, 2, 5, 10, 20, 50, 100, etc. | |
912 | // Calculate the resulting tick spacing (i.e. this.height_ / nTicks). | |
285a6bda | 913 | // The first spacing greater than pixelsPerYLabel is what we use. |
c6336f04 DV |
914 | var mults = [1, 2, 5]; |
915 | var scale, low_val, high_val, nTicks; | |
285a6bda DV |
916 | // TODO(danvk): make it possible to set this for x- and y-axes independently. |
917 | var pixelsPerTick = self.attr_('pixelsPerYLabel'); | |
c6336f04 DV |
918 | for (var i = -10; i < 50; i++) { |
919 | var base_scale = Math.pow(10, i); | |
920 | for (var j = 0; j < mults.length; j++) { | |
921 | scale = base_scale * mults[j]; | |
c6336f04 DV |
922 | low_val = Math.floor(minV / scale) * scale; |
923 | high_val = Math.ceil(maxV / scale) * scale; | |
924 | nTicks = (high_val - low_val) / scale; | |
285a6bda | 925 | var spacing = self.height_ / nTicks; |
c6336f04 | 926 | // wish I could break out of both loops at once... |
285a6bda | 927 | if (spacing > pixelsPerTick) break; |
c6336f04 | 928 | } |
285a6bda | 929 | if (spacing > pixelsPerTick) break; |
6a1aa64f DV |
930 | } |
931 | ||
932 | // Construct labels for the ticks | |
933 | var ticks = []; | |
c6336f04 DV |
934 | for (var i = 0; i < nTicks; i++) { |
935 | var tickV = low_val + i * scale; | |
285a6bda DV |
936 | var label = self.round_(tickV, 2); |
937 | if (self.attr_("labelsKMB")) { | |
6a1aa64f DV |
938 | var k = 1000; |
939 | if (tickV >= k*k*k) { | |
285a6bda | 940 | label = self.round_(tickV/(k*k*k), 1) + "B"; |
6a1aa64f | 941 | } else if (tickV >= k*k) { |
285a6bda | 942 | label = self.round_(tickV/(k*k), 1) + "M"; |
6a1aa64f | 943 | } else if (tickV >= k) { |
285a6bda | 944 | label = self.round_(tickV/k, 1) + "K"; |
6a1aa64f DV |
945 | } |
946 | } | |
947 | ticks.push( {label: label, v: tickV} ); | |
948 | } | |
949 | return ticks; | |
950 | }; | |
951 | ||
952 | /** | |
953 | * Adds appropriate ticks on the y-axis | |
954 | * @param {Number} minY The minimum Y value in the data set | |
955 | * @param {Number} maxY The maximum Y value in the data set | |
956 | * @private | |
957 | */ | |
285a6bda | 958 | Dygraph.prototype.addYTicks_ = function(minY, maxY) { |
6a1aa64f | 959 | // Set the number of ticks so that the labels are human-friendly. |
285a6bda DV |
960 | // TODO(danvk): make this an attribute as well. |
961 | var ticks = Dygraph.numericTicks(minY, maxY, this); | |
6a1aa64f DV |
962 | this.layout_.updateOptions( { yAxis: [minY, maxY], |
963 | yTicks: ticks } ); | |
964 | }; | |
965 | ||
5011e7a1 DV |
966 | // Computes the range of the data series (including confidence intervals). |
967 | // series is either [ [x1, y1], [x2, y2], ... ] or | |
968 | // [ [x1, [y1, dev_low, dev_high]], [x2, [y2, dev_low, dev_high]], ... | |
969 | // Returns [low, high] | |
970 | Dygraph.prototype.extremeValues_ = function(series) { | |
971 | var minY = null, maxY = null; | |
972 | ||
973 | var bars = this.attr_("errorBars") || this.customBars_; | |
974 | if (bars) { | |
975 | // With custom bars, maxY is the max of the high values. | |
976 | for (var j = 0; j < series.length; j++) { | |
977 | var y = series[j][1][0]; | |
978 | if (!y) continue; | |
979 | var low = y - series[j][1][1]; | |
980 | var high = y + series[j][1][2]; | |
981 | if (low > y) low = y; // this can happen with custom bars, | |
982 | if (high < y) high = y; // e.g. in tests/custom-bars.html | |
983 | if (maxY == null || high > maxY) { | |
984 | maxY = high; | |
985 | } | |
986 | if (minY == null || low < minY) { | |
987 | minY = low; | |
988 | } | |
989 | } | |
990 | } else { | |
991 | for (var j = 0; j < series.length; j++) { | |
992 | var y = series[j][1]; | |
993 | if (!y) continue; | |
994 | if (maxY == null || y > maxY) { | |
995 | maxY = y; | |
996 | } | |
997 | if (minY == null || y < minY) { | |
998 | minY = y; | |
999 | } | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | return [minY, maxY]; | |
1004 | }; | |
1005 | ||
6a1aa64f DV |
1006 | /** |
1007 | * Update the graph with new data. Data is in the format | |
1008 | * [ [date1, val1, val2, ...], [date2, val1, val2, ...] if errorBars=false | |
1009 | * or, if errorBars=true, | |
1010 | * [ [date1, [val1,stddev1], [val2,stddev2], ...], [date2, ...], ...] | |
1011 | * @param {Array.<Object>} data The data (see above) | |
1012 | * @private | |
1013 | */ | |
285a6bda | 1014 | Dygraph.prototype.drawGraph_ = function(data) { |
3bd9c228 | 1015 | var minY = null, maxY = null; |
6a1aa64f | 1016 | this.layout_.removeAllDatasets(); |
285a6bda | 1017 | this.setColors_(); |
9317362d | 1018 | this.attrs_['pointSize'] = 0.5 * this.attr_('highlightCircleSize'); |
285a6bda | 1019 | |
6a1aa64f DV |
1020 | // Loop over all fields in the dataset |
1021 | for (var i = 1; i < data[0].length; i++) { | |
1022 | var series = []; | |
1023 | for (var j = 0; j < data.length; j++) { | |
1024 | var date = data[j][0]; | |
1025 | series[j] = [date, data[j][i]]; | |
1026 | } | |
1027 | series = this.rollingAverage(series, this.rollPeriod_); | |
1028 | ||
1029 | // Prune down to the desired range, if necessary (for zooming) | |
285a6bda | 1030 | var bars = this.attr_("errorBars") || this.customBars_; |
6a1aa64f DV |
1031 | if (this.dateWindow_) { |
1032 | var low = this.dateWindow_[0]; | |
1033 | var high= this.dateWindow_[1]; | |
1034 | var pruned = []; | |
1035 | for (var k = 0; k < series.length; k++) { | |
1036 | if (series[k][0] >= low && series[k][0] <= high) { | |
1037 | pruned.push(series[k]); | |
6a1aa64f DV |
1038 | } |
1039 | } | |
1040 | series = pruned; | |
6a1aa64f DV |
1041 | } |
1042 | ||
648acd28 DV |
1043 | var extremes = this.extremeValues_(series); |
1044 | var thisMinY = extremes[0]; | |
1045 | var thisMaxY = extremes[1]; | |
5011e7a1 DV |
1046 | if (!minY || thisMinY < minY) minY = thisMinY; |
1047 | if (!maxY || thisMaxY > maxY) maxY = thisMaxY; | |
1048 | ||
6a1aa64f DV |
1049 | if (bars) { |
1050 | var vals = []; | |
1051 | for (var j=0; j<series.length; j++) | |
1052 | vals[j] = [series[j][0], | |
1053 | series[j][1][0], series[j][1][1], series[j][1][2]]; | |
285a6bda | 1054 | this.layout_.addDataset(this.attr_("labels")[i], vals); |
6a1aa64f | 1055 | } else { |
285a6bda | 1056 | this.layout_.addDataset(this.attr_("labels")[i], series); |
6a1aa64f DV |
1057 | } |
1058 | } | |
1059 | ||
1060 | // Use some heuristics to come up with a good maxY value, unless it's been | |
1061 | // set explicitly by the user. | |
1062 | if (this.valueRange_ != null) { | |
1063 | this.addYTicks_(this.valueRange_[0], this.valueRange_[1]); | |
1064 | } else { | |
1065 | // Add some padding and round up to an integer to be human-friendly. | |
3bd9c228 DV |
1066 | var span = maxY - minY; |
1067 | var maxAxisY = maxY + 0.1 * span; | |
1068 | var minAxisY = minY - 0.1 * span; | |
1069 | ||
1070 | // Try to include zero and make it minAxisY (or maxAxisY) if it makes sense. | |
ceb009dd DV |
1071 | if (minAxisY < 0 && minY >= 0) minAxisY = 0; |
1072 | if (maxAxisY > 0 && maxY <= 0) maxAxisY = 0; | |
3bd9c228 DV |
1073 | |
1074 | if (this.attr_("includeZero")) { | |
1075 | if (maxY < 0) maxAxisY = 0; | |
1076 | if (minY > 0) minAxisY = 0; | |
1077 | } | |
1078 | ||
1079 | this.addYTicks_(minAxisY, maxAxisY); | |
6a1aa64f DV |
1080 | } |
1081 | ||
1082 | this.addXTicks_(); | |
1083 | ||
1084 | // Tell PlotKit to use this new data and render itself | |
1085 | this.layout_.evaluateWithError(); | |
1086 | this.plotter_.clear(); | |
1087 | this.plotter_.render(); | |
1088 | this.canvas_.getContext('2d').clearRect(0, 0, | |
1089 | this.canvas_.width, this.canvas_.height); | |
1090 | }; | |
1091 | ||
1092 | /** | |
1093 | * Calculates the rolling average of a data set. | |
1094 | * If originalData is [label, val], rolls the average of those. | |
1095 | * If originalData is [label, [, it's interpreted as [value, stddev] | |
1096 | * and the roll is returned in the same form, with appropriately reduced | |
1097 | * stddev for each value. | |
1098 | * Note that this is where fractional input (i.e. '5/10') is converted into | |
1099 | * decimal values. | |
1100 | * @param {Array} originalData The data in the appropriate format (see above) | |
1101 | * @param {Number} rollPeriod The number of days over which to average the data | |
1102 | */ | |
285a6bda | 1103 | Dygraph.prototype.rollingAverage = function(originalData, rollPeriod) { |
6a1aa64f DV |
1104 | if (originalData.length < 2) |
1105 | return originalData; | |
1106 | var rollPeriod = Math.min(rollPeriod, originalData.length - 1); | |
1107 | var rollingData = []; | |
285a6bda | 1108 | var sigma = this.attr_("sigma"); |
6a1aa64f DV |
1109 | |
1110 | if (this.fractions_) { | |
1111 | var num = 0; | |
1112 | var den = 0; // numerator/denominator | |
1113 | var mult = 100.0; | |
1114 | for (var i = 0; i < originalData.length; i++) { | |
1115 | num += originalData[i][1][0]; | |
1116 | den += originalData[i][1][1]; | |
1117 | if (i - rollPeriod >= 0) { | |
1118 | num -= originalData[i - rollPeriod][1][0]; | |
1119 | den -= originalData[i - rollPeriod][1][1]; | |
1120 | } | |
1121 | ||
1122 | var date = originalData[i][0]; | |
1123 | var value = den ? num / den : 0.0; | |
285a6bda | 1124 | if (this.attr_("errorBars")) { |
6a1aa64f DV |
1125 | if (this.wilsonInterval_) { |
1126 | // For more details on this confidence interval, see: | |
1127 | // http://en.wikipedia.org/wiki/Binomial_confidence_interval | |
1128 | if (den) { | |
1129 | var p = value < 0 ? 0 : value, n = den; | |
1130 | var pm = sigma * Math.sqrt(p*(1-p)/n + sigma*sigma/(4*n*n)); | |
1131 | var denom = 1 + sigma * sigma / den; | |
1132 | var low = (p + sigma * sigma / (2 * den) - pm) / denom; | |
1133 | var high = (p + sigma * sigma / (2 * den) + pm) / denom; | |
1134 | rollingData[i] = [date, | |
1135 | [p * mult, (p - low) * mult, (high - p) * mult]]; | |
1136 | } else { | |
1137 | rollingData[i] = [date, [0, 0, 0]]; | |
1138 | } | |
1139 | } else { | |
1140 | var stddev = den ? sigma * Math.sqrt(value * (1 - value) / den) : 1.0; | |
1141 | rollingData[i] = [date, [mult * value, mult * stddev, mult * stddev]]; | |
1142 | } | |
1143 | } else { | |
1144 | rollingData[i] = [date, mult * value]; | |
1145 | } | |
1146 | } | |
1147 | } else if (this.customBars_) { | |
f6885d6a DV |
1148 | var low = 0; |
1149 | var mid = 0; | |
1150 | var high = 0; | |
1151 | var count = 0; | |
6a1aa64f DV |
1152 | for (var i = 0; i < originalData.length; i++) { |
1153 | var data = originalData[i][1]; | |
1154 | var y = data[1]; | |
1155 | rollingData[i] = [originalData[i][0], [y, y - data[0], data[2] - y]]; | |
f6885d6a DV |
1156 | |
1157 | low += data[0]; | |
1158 | mid += y; | |
1159 | high += data[2]; | |
1160 | count += 1; | |
1161 | if (i - rollPeriod >= 0) { | |
1162 | var prev = originalData[i - rollPeriod]; | |
1163 | low -= prev[1][0]; | |
1164 | mid -= prev[1][1]; | |
1165 | high -= prev[1][2]; | |
1166 | count -= 1; | |
1167 | } | |
1168 | rollingData[i] = [originalData[i][0], [ 1.0 * mid / count, | |
1169 | 1.0 * (mid - low) / count, | |
1170 | 1.0 * (high - mid) / count ]]; | |
2769de62 | 1171 | } |
6a1aa64f DV |
1172 | } else { |
1173 | // Calculate the rolling average for the first rollPeriod - 1 points where | |
1174 | // there is not enough data to roll over the full number of days | |
1175 | var num_init_points = Math.min(rollPeriod - 1, originalData.length - 2); | |
285a6bda | 1176 | if (!this.attr_("errorBars")){ |
5011e7a1 DV |
1177 | if (rollPeriod == 1) { |
1178 | return originalData; | |
1179 | } | |
1180 | ||
2847c1cf | 1181 | for (var i = 0; i < originalData.length; i++) { |
6a1aa64f | 1182 | var sum = 0; |
5011e7a1 | 1183 | var num_ok = 0; |
2847c1cf DV |
1184 | for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) { |
1185 | var y = originalData[j][1]; | |
5011e7a1 DV |
1186 | if (!y || isNaN(y)) continue; |
1187 | num_ok++; | |
2847c1cf | 1188 | sum += originalData[j][1]; |
6a1aa64f | 1189 | } |
5011e7a1 | 1190 | if (num_ok) { |
2847c1cf | 1191 | rollingData[i] = [originalData[i][0], sum / num_ok]; |
5011e7a1 | 1192 | } else { |
2847c1cf | 1193 | rollingData[i] = [originalData[i][0], null]; |
5011e7a1 | 1194 | } |
6a1aa64f | 1195 | } |
2847c1cf DV |
1196 | |
1197 | } else { | |
1198 | for (var i = 0; i < originalData.length; i++) { | |
6a1aa64f DV |
1199 | var sum = 0; |
1200 | var variance = 0; | |
5011e7a1 | 1201 | var num_ok = 0; |
2847c1cf | 1202 | for (var j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) { |
5011e7a1 DV |
1203 | var y = originalData[j][1][0]; |
1204 | if (!y || isNaN(y)) continue; | |
1205 | num_ok++; | |
6a1aa64f DV |
1206 | sum += originalData[j][1][0]; |
1207 | variance += Math.pow(originalData[j][1][1], 2); | |
1208 | } | |
5011e7a1 DV |
1209 | if (num_ok) { |
1210 | var stddev = Math.sqrt(variance) / num_ok; | |
1211 | rollingData[i] = [originalData[i][0], | |
1212 | [sum / num_ok, sigma * stddev, sigma * stddev]]; | |
1213 | } else { | |
1214 | rollingData[i] = [originalData[i][0], [null, null, null]]; | |
1215 | } | |
6a1aa64f DV |
1216 | } |
1217 | } | |
1218 | } | |
1219 | ||
1220 | return rollingData; | |
1221 | }; | |
1222 | ||
1223 | /** | |
1224 | * Parses a date, returning the number of milliseconds since epoch. This can be | |
285a6bda DV |
1225 | * passed in as an xValueParser in the Dygraph constructor. |
1226 | * TODO(danvk): enumerate formats that this understands. | |
6a1aa64f DV |
1227 | * @param {String} A date in YYYYMMDD format. |
1228 | * @return {Number} Milliseconds since epoch. | |
1229 | * @public | |
1230 | */ | |
285a6bda | 1231 | Dygraph.dateParser = function(dateStr, self) { |
6a1aa64f | 1232 | var dateStrSlashed; |
285a6bda | 1233 | var d; |
2769de62 | 1234 | if (dateStr.length == 10 && dateStr.search("-") != -1) { // e.g. '2009-07-12' |
6a1aa64f | 1235 | dateStrSlashed = dateStr.replace("-", "/", "g"); |
353a0294 DV |
1236 | while (dateStrSlashed.search("-") != -1) { |
1237 | dateStrSlashed = dateStrSlashed.replace("-", "/"); | |
1238 | } | |
285a6bda | 1239 | d = Date.parse(dateStrSlashed); |
2769de62 | 1240 | } else if (dateStr.length == 8) { // e.g. '20090712' |
285a6bda | 1241 | // TODO(danvk): remove support for this format. It's confusing. |
6a1aa64f DV |
1242 | dateStrSlashed = dateStr.substr(0,4) + "/" + dateStr.substr(4,2) |
1243 | + "/" + dateStr.substr(6,2); | |
285a6bda | 1244 | d = Date.parse(dateStrSlashed); |
2769de62 DV |
1245 | } else { |
1246 | // Any format that Date.parse will accept, e.g. "2009/07/12" or | |
1247 | // "2009/07/12 12:34:56" | |
285a6bda DV |
1248 | d = Date.parse(dateStr); |
1249 | } | |
1250 | ||
1251 | if (!d || isNaN(d)) { | |
1252 | self.error("Couldn't parse " + dateStr + " as a date"); | |
1253 | } | |
1254 | return d; | |
1255 | }; | |
1256 | ||
1257 | /** | |
1258 | * Detects the type of the str (date or numeric) and sets the various | |
1259 | * formatting attributes in this.attrs_ based on this type. | |
1260 | * @param {String} str An x value. | |
1261 | * @private | |
1262 | */ | |
1263 | Dygraph.prototype.detectTypeFromString_ = function(str) { | |
1264 | var isDate = false; | |
1265 | if (str.indexOf('-') >= 0 || | |
1266 | str.indexOf('/') >= 0 || | |
1267 | isNaN(parseFloat(str))) { | |
1268 | isDate = true; | |
1269 | } else if (str.length == 8 && str > '19700101' && str < '20371231') { | |
1270 | // TODO(danvk): remove support for this format. | |
1271 | isDate = true; | |
1272 | } | |
1273 | ||
1274 | if (isDate) { | |
1275 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1276 | this.attrs_.xValueParser = Dygraph.dateParser; | |
1277 | this.attrs_.xTicker = Dygraph.dateTicker; | |
1278 | } else { | |
1279 | this.attrs_.xValueFormatter = function(x) { return x; }; | |
1280 | this.attrs_.xValueParser = function(x) { return parseFloat(x); }; | |
1281 | this.attrs_.xTicker = Dygraph.numericTicks; | |
6a1aa64f | 1282 | } |
6a1aa64f DV |
1283 | }; |
1284 | ||
1285 | /** | |
1286 | * Parses a string in a special csv format. We expect a csv file where each | |
1287 | * line is a date point, and the first field in each line is the date string. | |
1288 | * We also expect that all remaining fields represent series. | |
285a6bda | 1289 | * if the errorBars attribute is set, then interpret the fields as: |
6a1aa64f DV |
1290 | * date, series1, stddev1, series2, stddev2, ... |
1291 | * @param {Array.<Object>} data See above. | |
1292 | * @private | |
285a6bda DV |
1293 | * |
1294 | * @return Array.<Object> An array with one entry for each row. These entries | |
1295 | * are an array of cells in that row. The first entry is the parsed x-value for | |
1296 | * the row. The second, third, etc. are the y-values. These can take on one of | |
1297 | * three forms, depending on the CSV and constructor parameters: | |
1298 | * 1. numeric value | |
1299 | * 2. [ value, stddev ] | |
1300 | * 3. [ low value, center value, high value ] | |
6a1aa64f | 1301 | */ |
285a6bda | 1302 | Dygraph.prototype.parseCSV_ = function(data) { |
6a1aa64f DV |
1303 | var ret = []; |
1304 | var lines = data.split("\n"); | |
285a6bda | 1305 | var start = 0; |
6a1aa64f | 1306 | if (this.labelsFromCSV_) { |
285a6bda DV |
1307 | start = 1; |
1308 | this.attrs_.labels = lines[0].split(","); | |
6a1aa64f DV |
1309 | } |
1310 | ||
285a6bda DV |
1311 | var xParser; |
1312 | var defaultParserSet = false; // attempt to auto-detect x value type | |
1313 | var expectedCols = this.attr_("labels").length; | |
6a1aa64f DV |
1314 | for (var i = start; i < lines.length; i++) { |
1315 | var line = lines[i]; | |
1316 | if (line.length == 0) continue; // skip blank lines | |
1317 | var inFields = line.split(','); | |
285a6bda | 1318 | if (inFields.length < 2) continue; |
6a1aa64f DV |
1319 | |
1320 | var fields = []; | |
285a6bda DV |
1321 | if (!defaultParserSet) { |
1322 | this.detectTypeFromString_(inFields[0]); | |
1323 | xParser = this.attr_("xValueParser"); | |
1324 | defaultParserSet = true; | |
1325 | } | |
1326 | fields[0] = xParser(inFields[0], this); | |
6a1aa64f DV |
1327 | |
1328 | // If fractions are expected, parse the numbers as "A/B" | |
1329 | if (this.fractions_) { | |
1330 | for (var j = 1; j < inFields.length; j++) { | |
1331 | // TODO(danvk): figure out an appropriate way to flag parse errors. | |
1332 | var vals = inFields[j].split("/"); | |
1333 | fields[j] = [parseFloat(vals[0]), parseFloat(vals[1])]; | |
1334 | } | |
285a6bda | 1335 | } else if (this.attr_("errorBars")) { |
6a1aa64f DV |
1336 | // If there are error bars, values are (value, stddev) pairs |
1337 | for (var j = 1; j < inFields.length; j += 2) | |
1338 | fields[(j + 1) / 2] = [parseFloat(inFields[j]), | |
1339 | parseFloat(inFields[j + 1])]; | |
1340 | } else if (this.customBars_) { | |
1341 | // Bars are a low;center;high tuple | |
1342 | for (var j = 1; j < inFields.length; j++) { | |
1343 | var vals = inFields[j].split(";"); | |
1344 | fields[j] = [ parseFloat(vals[0]), | |
1345 | parseFloat(vals[1]), | |
1346 | parseFloat(vals[2]) ]; | |
1347 | } | |
1348 | } else { | |
1349 | // Values are just numbers | |
285a6bda | 1350 | for (var j = 1; j < inFields.length; j++) { |
6a1aa64f | 1351 | fields[j] = parseFloat(inFields[j]); |
285a6bda | 1352 | } |
6a1aa64f DV |
1353 | } |
1354 | ret.push(fields); | |
285a6bda DV |
1355 | |
1356 | if (fields.length != expectedCols) { | |
1357 | this.error("Number of columns in line " + i + " (" + fields.length + | |
1358 | ") does not agree with number of labels (" + expectedCols + | |
1359 | ") " + line); | |
1360 | } | |
6a1aa64f DV |
1361 | } |
1362 | return ret; | |
1363 | }; | |
1364 | ||
1365 | /** | |
285a6bda DV |
1366 | * The user has provided their data as a pre-packaged JS array. If the x values |
1367 | * are numeric, this is the same as dygraphs' internal format. If the x values | |
1368 | * are dates, we need to convert them from Date objects to ms since epoch. | |
1369 | * @param {Array.<Object>} data | |
1370 | * @return {Array.<Object>} data with numeric x values. | |
1371 | */ | |
1372 | Dygraph.prototype.parseArray_ = function(data) { | |
1373 | // Peek at the first x value to see if it's numeric. | |
1374 | if (data.length == 0) { | |
1375 | this.error("Can't plot empty data set"); | |
1376 | return null; | |
1377 | } | |
1378 | if (data[0].length == 0) { | |
1379 | this.error("Data set cannot contain an empty row"); | |
1380 | return null; | |
1381 | } | |
1382 | ||
1383 | if (this.attr_("labels") == null) { | |
1384 | this.warn("Using default labels. Set labels explicitly via 'labels' " + | |
1385 | "in the options parameter"); | |
1386 | this.attrs_.labels = [ "X" ]; | |
1387 | for (var i = 1; i < data[0].length; i++) { | |
1388 | this.attrs_.labels.push("Y" + i); | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | if (MochiKit.Base.isDateLike(data[0][0])) { | |
1393 | // Some intelligent defaults for a date x-axis. | |
1394 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1395 | this.attrs_.xTicker = Dygraph.dateTicker; | |
1396 | ||
1397 | // Assume they're all dates. | |
1398 | var parsedData = MochiKit.Base.clone(data); | |
1399 | for (var i = 0; i < data.length; i++) { | |
1400 | if (parsedData[i].length == 0) { | |
1401 | this.error("Row " << (1 + i) << " of data is empty"); | |
1402 | return null; | |
1403 | } | |
1404 | if (parsedData[i][0] == null | |
1405 | || typeof(parsedData[i][0].getTime) != 'function') { | |
1406 | this.error("x value in row " << (1 + i) << " is not a Date"); | |
1407 | return null; | |
1408 | } | |
1409 | parsedData[i][0] = parsedData[i][0].getTime(); | |
1410 | } | |
1411 | return parsedData; | |
1412 | } else { | |
1413 | // Some intelligent defaults for a numeric x-axis. | |
1414 | this.attrs_.xValueFormatter = function(x) { return x; }; | |
1415 | this.attrs_.xTicker = Dygraph.numericTicks; | |
1416 | return data; | |
1417 | } | |
1418 | }; | |
1419 | ||
1420 | /** | |
79420a1e DV |
1421 | * Parses a DataTable object from gviz. |
1422 | * The data is expected to have a first column that is either a date or a | |
1423 | * number. All subsequent columns must be numbers. If there is a clear mismatch | |
1424 | * between this.xValueParser_ and the type of the first column, it will be | |
1425 | * fixed. Returned value is in the same format as return value of parseCSV_. | |
1426 | * @param {Array.<Object>} data See above. | |
1427 | * @private | |
1428 | */ | |
285a6bda | 1429 | Dygraph.prototype.parseDataTable_ = function(data) { |
79420a1e DV |
1430 | var cols = data.getNumberOfColumns(); |
1431 | var rows = data.getNumberOfRows(); | |
1432 | ||
1433 | // Read column labels | |
1434 | var labels = []; | |
1435 | for (var i = 0; i < cols; i++) { | |
1436 | labels.push(data.getColumnLabel(i)); | |
1437 | } | |
285a6bda | 1438 | this.attrs_.labels = labels; |
79420a1e | 1439 | |
d955e223 | 1440 | var indepType = data.getColumnType(0); |
285a6bda DV |
1441 | if (indepType == 'date') { |
1442 | this.attrs_.xValueFormatter = Dygraph.dateString_; | |
1443 | this.attrs_.xValueParser = Dygraph.dateParser; | |
1444 | this.attrs_.xTicker = Dygraph.dateTicker; | |
33127159 | 1445 | } else if (indepType == 'number') { |
285a6bda DV |
1446 | this.attrs_.xValueFormatter = function(x) { return x; }; |
1447 | this.attrs_.xValueParser = function(x) { return parseFloat(x); }; | |
1448 | this.attrs_.xTicker = Dygraph.numericTicks; | |
1449 | } else { | |
33127159 | 1450 | this.error("only 'date' and 'number' types are supported for column 1 " + |
285a6bda | 1451 | "of DataTable input (Got '" + indepType + "')"); |
79420a1e DV |
1452 | return null; |
1453 | } | |
1454 | ||
1455 | var ret = []; | |
1456 | for (var i = 0; i < rows; i++) { | |
1457 | var row = []; | |
b3b20e24 | 1458 | if (!data.getValue(i, 0)) continue; |
d955e223 DV |
1459 | if (indepType == 'date') { |
1460 | row.push(data.getValue(i, 0).getTime()); | |
1461 | } else { | |
1462 | row.push(data.getValue(i, 0)); | |
1463 | } | |
79420a1e DV |
1464 | for (var j = 1; j < cols; j++) { |
1465 | row.push(data.getValue(i, j)); | |
1466 | } | |
243d96e8 | 1467 | ret.push(row); |
79420a1e DV |
1468 | } |
1469 | return ret; | |
1470 | } | |
1471 | ||
1472 | /** | |
6a1aa64f DV |
1473 | * Get the CSV data. If it's in a function, call that function. If it's in a |
1474 | * file, do an XMLHttpRequest to get it. | |
1475 | * @private | |
1476 | */ | |
285a6bda | 1477 | Dygraph.prototype.start_ = function() { |
6a1aa64f | 1478 | if (typeof this.file_ == 'function') { |
285a6bda | 1479 | // CSV string. Pretend we got it via XHR. |
6a1aa64f | 1480 | this.loadedEvent_(this.file_()); |
285a6bda DV |
1481 | } else if (MochiKit.Base.isArrayLike(this.file_)) { |
1482 | this.rawData_ = this.parseArray_(this.file_); | |
1483 | this.drawGraph_(this.rawData_); | |
79420a1e DV |
1484 | } else if (typeof this.file_ == 'object' && |
1485 | typeof this.file_.getColumnRange == 'function') { | |
1486 | // must be a DataTable from gviz. | |
1487 | this.rawData_ = this.parseDataTable_(this.file_); | |
1488 | this.drawGraph_(this.rawData_); | |
285a6bda DV |
1489 | } else if (typeof this.file_ == 'string') { |
1490 | // Heuristic: a newline means it's CSV data. Otherwise it's an URL. | |
1491 | if (this.file_.indexOf('\n') >= 0) { | |
1492 | this.loadedEvent_(this.file_); | |
1493 | } else { | |
1494 | var req = new XMLHttpRequest(); | |
1495 | var caller = this; | |
1496 | req.onreadystatechange = function () { | |
1497 | if (req.readyState == 4) { | |
1498 | if (req.status == 200) { | |
1499 | caller.loadedEvent_(req.responseText); | |
1500 | } | |
6a1aa64f | 1501 | } |
285a6bda | 1502 | }; |
6a1aa64f | 1503 | |
285a6bda DV |
1504 | req.open("GET", this.file_, true); |
1505 | req.send(null); | |
1506 | } | |
1507 | } else { | |
1508 | this.error("Unknown data format: " + (typeof this.file_)); | |
6a1aa64f DV |
1509 | } |
1510 | }; | |
1511 | ||
1512 | /** | |
1513 | * Changes various properties of the graph. These can include: | |
1514 | * <ul> | |
1515 | * <li>file: changes the source data for the graph</li> | |
1516 | * <li>errorBars: changes whether the data contains stddev</li> | |
1517 | * </ul> | |
1518 | * @param {Object} attrs The new properties and values | |
1519 | */ | |
285a6bda DV |
1520 | Dygraph.prototype.updateOptions = function(attrs) { |
1521 | // TODO(danvk): this is a mess. Rethink this function. | |
6a1aa64f DV |
1522 | if (attrs.customBars) { |
1523 | this.customBars_ = attrs.customBars; | |
1524 | } | |
6a1aa64f DV |
1525 | if (attrs.rollPeriod) { |
1526 | this.rollPeriod_ = attrs.rollPeriod; | |
1527 | } | |
1528 | if (attrs.dateWindow) { | |
1529 | this.dateWindow_ = attrs.dateWindow; | |
1530 | } | |
1531 | if (attrs.valueRange) { | |
1532 | this.valueRange_ = attrs.valueRange; | |
1533 | } | |
285a6bda DV |
1534 | MochiKit.Base.update(this.user_attrs_, attrs); |
1535 | ||
1536 | this.labelsFromCSV_ = (this.attr_("labels") == null); | |
1537 | ||
1538 | // TODO(danvk): this doesn't match the constructor logic | |
1539 | this.layout_.updateOptions({ 'errorBars': this.attr_("errorBars") }); | |
6a1aa64f DV |
1540 | if (attrs['file'] && attrs['file'] != this.file_) { |
1541 | this.file_ = attrs['file']; | |
1542 | this.start_(); | |
1543 | } else { | |
1544 | this.drawGraph_(this.rawData_); | |
1545 | } | |
1546 | }; | |
1547 | ||
1548 | /** | |
1549 | * Adjusts the number of days in the rolling average. Updates the graph to | |
1550 | * reflect the new averaging period. | |
1551 | * @param {Number} length Number of days over which to average the data. | |
1552 | */ | |
285a6bda | 1553 | Dygraph.prototype.adjustRoll = function(length) { |
6a1aa64f DV |
1554 | this.rollPeriod_ = length; |
1555 | this.drawGraph_(this.rawData_); | |
1556 | }; | |
540d00f1 DV |
1557 | |
1558 | ||
1559 | /** | |
285a6bda | 1560 | * A wrapper around Dygraph that implements the gviz API. |
540d00f1 DV |
1561 | * @param {Object} container The DOM object the visualization should live in. |
1562 | */ | |
285a6bda | 1563 | Dygraph.GVizChart = function(container) { |
540d00f1 DV |
1564 | this.container = container; |
1565 | } | |
1566 | ||
285a6bda | 1567 | Dygraph.GVizChart.prototype.draw = function(data, options) { |
540d00f1 | 1568 | this.container.innerHTML = ''; |
285a6bda | 1569 | this.date_graph = new Dygraph(this.container, data, options); |
540d00f1 | 1570 | } |
285a6bda DV |
1571 | |
1572 | // Older pages may still use this name. | |
1573 | DateGraph = Dygraph; |