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dedb4f5f DV |
1 | |
2 | ||
3 | Dygraph.LOG_SCALE = 10; | |
4 | Dygraph.LN_TEN = Math.log(Dygraph.LOG_SCALE); | |
5 | ||
6 | /** @private */ | |
7 | Dygraph.log10 = function(x) { | |
8 | return Math.log(x) / Dygraph.LN_TEN; | |
9 | } | |
10 | ||
11 | // Various logging levels. | |
12 | Dygraph.DEBUG = 1; | |
13 | Dygraph.INFO = 2; | |
14 | Dygraph.WARNING = 3; | |
15 | Dygraph.ERROR = 3; | |
16 | ||
17 | // TODO(danvk): any way I can get the line numbers to be this.warn call? | |
18 | /** | |
19 | * @private | |
20 | * Log an error on the JS console at the given severity. | |
21 | * @param { Integer } severity One of Dygraph.{DEBUG,INFO,WARNING,ERROR} | |
22 | * @param { String } The message to log. | |
23 | */ | |
24 | Dygraph.log = function(severity, message) { | |
25 | if (typeof(console) != 'undefined') { | |
26 | switch (severity) { | |
27 | case Dygraph.DEBUG: | |
28 | console.debug('dygraphs: ' + message); | |
29 | break; | |
30 | case Dygraph.INFO: | |
31 | console.info('dygraphs: ' + message); | |
32 | break; | |
33 | case Dygraph.WARNING: | |
34 | console.warn('dygraphs: ' + message); | |
35 | break; | |
36 | case Dygraph.ERROR: | |
37 | console.error('dygraphs: ' + message); | |
38 | break; | |
39 | } | |
40 | } | |
41 | }; | |
42 | ||
43 | /** @private */ | |
44 | Dygraph.info = function(message) { | |
45 | Dygraph.log(Dygraph.INFO, message); | |
46 | }; | |
47 | /** @private */ | |
48 | Dygraph.prototype.info = Dygraph.info; | |
49 | ||
50 | /** @private */ | |
51 | Dygraph.warn = function(message) { | |
52 | Dygraph.log(Dygraph.WARNING, message); | |
53 | }; | |
54 | /** @private */ | |
55 | Dygraph.prototype.warn = Dygraph.warn; | |
56 | ||
57 | /** @private */ | |
58 | Dygraph.error = function(message) { | |
59 | Dygraph.log(Dygraph.ERROR, message); | |
60 | }; | |
61 | /** @private */ | |
62 | Dygraph.prototype.error = Dygraph.error; | |
63 | ||
64 | /** | |
65 | * @private | |
66 | * Return the 2d context for a dygraph canvas. | |
67 | * | |
68 | * This method is only exposed for the sake of replacing the function in | |
69 | * automated tests, e.g. | |
70 | * | |
71 | * var oldFunc = Dygraph.getContext(); | |
72 | * Dygraph.getContext = function(canvas) { | |
73 | * var realContext = oldFunc(canvas); | |
74 | * return new Proxy(realContext); | |
75 | * }; | |
76 | */ | |
77 | Dygraph.getContext = function(canvas) { | |
78 | return canvas.getContext("2d"); | |
79 | }; | |
80 | ||
81 | /** | |
82 | * @private | |
83 | * Add an event handler. This smooths a difference between IE and the rest of | |
84 | * the world. | |
85 | * @param { DOM element } el The element to add the event to. | |
86 | * @param { String } evt The name of the event, e.g. 'click' or 'mousemove'. | |
87 | * @param { Function } fn The function to call on the event. The function takes | |
88 | * one parameter: the event object. | |
89 | */ | |
90 | Dygraph.addEvent = function(el, evt, fn) { | |
91 | var normed_fn = function(e) { | |
92 | if (!e) var e = window.event; | |
93 | fn(e); | |
94 | }; | |
95 | if (window.addEventListener) { // Mozilla, Netscape, Firefox | |
96 | el.addEventListener(evt, normed_fn, false); | |
97 | } else { // IE | |
98 | el.attachEvent('on' + evt, normed_fn); | |
99 | } | |
100 | }; | |
101 | ||
102 | /** | |
103 | * @private | |
104 | * Cancels further processing of an event. This is useful to prevent default | |
105 | * browser actions, e.g. highlighting text on a double-click. | |
106 | * Based on the article at | |
107 | * http://www.switchonthecode.com/tutorials/javascript-tutorial-the-scroll-wheel | |
108 | * @param { Event } e The event whose normal behavior should be canceled. | |
109 | */ | |
110 | Dygraph.cancelEvent = function(e) { | |
111 | e = e ? e : window.event; | |
112 | if (e.stopPropagation) { | |
113 | e.stopPropagation(); | |
114 | } | |
115 | if (e.preventDefault) { | |
116 | e.preventDefault(); | |
117 | } | |
118 | e.cancelBubble = true; | |
119 | e.cancel = true; | |
120 | e.returnValue = false; | |
121 | return false; | |
122 | }; | |
123 | ||
124 | /** | |
125 | * Convert hsv values to an rgb(r,g,b) string. Taken from MochiKit.Color. This | |
126 | * is used to generate default series colors which are evenly spaced on the | |
127 | * color wheel. | |
128 | * @param { Number } hue Range is 0.0-1.0. | |
129 | * @param { Number } saturation Range is 0.0-1.0. | |
130 | * @param { Number } value Range is 0.0-1.0. | |
131 | * @return { String } "rgb(r,g,b)" where r, g and b range from 0-255. | |
132 | * @private | |
133 | */ | |
134 | Dygraph.hsvToRGB = function (hue, saturation, value) { | |
135 | var red; | |
136 | var green; | |
137 | var blue; | |
138 | if (saturation === 0) { | |
139 | red = value; | |
140 | green = value; | |
141 | blue = value; | |
142 | } else { | |
143 | var i = Math.floor(hue * 6); | |
144 | var f = (hue * 6) - i; | |
145 | var p = value * (1 - saturation); | |
146 | var q = value * (1 - (saturation * f)); | |
147 | var t = value * (1 - (saturation * (1 - f))); | |
148 | switch (i) { | |
149 | case 1: red = q; green = value; blue = p; break; | |
150 | case 2: red = p; green = value; blue = t; break; | |
151 | case 3: red = p; green = q; blue = value; break; | |
152 | case 4: red = t; green = p; blue = value; break; | |
153 | case 5: red = value; green = p; blue = q; break; | |
154 | case 6: // fall through | |
155 | case 0: red = value; green = t; blue = p; break; | |
156 | } | |
157 | } | |
158 | red = Math.floor(255 * red + 0.5); | |
159 | green = Math.floor(255 * green + 0.5); | |
160 | blue = Math.floor(255 * blue + 0.5); | |
161 | return 'rgb(' + red + ',' + green + ',' + blue + ')'; | |
162 | }; | |
163 | ||
164 | // The following functions are from quirksmode.org with a modification for Safari from | |
165 | // http://blog.firetree.net/2005/07/04/javascript-find-position/ | |
166 | // http://www.quirksmode.org/js/findpos.html | |
167 | ||
168 | /** @private */ | |
169 | Dygraph.findPosX = function(obj) { | |
170 | var curleft = 0; | |
171 | if(obj.offsetParent) | |
172 | while(1) | |
173 | { | |
174 | curleft += obj.offsetLeft; | |
175 | if(!obj.offsetParent) | |
176 | break; | |
177 | obj = obj.offsetParent; | |
178 | } | |
179 | else if(obj.x) | |
180 | curleft += obj.x; | |
181 | return curleft; | |
182 | }; | |
183 | ||
184 | /** @private */ | |
185 | Dygraph.findPosY = function(obj) { | |
186 | var curtop = 0; | |
187 | if(obj.offsetParent) | |
188 | while(1) | |
189 | { | |
190 | curtop += obj.offsetTop; | |
191 | if(!obj.offsetParent) | |
192 | break; | |
193 | obj = obj.offsetParent; | |
194 | } | |
195 | else if(obj.y) | |
196 | curtop += obj.y; | |
197 | return curtop; | |
198 | }; | |
199 | ||
200 | /** | |
201 | * @private | |
202 | * Returns the x-coordinate of the event in a coordinate system where the | |
203 | * top-left corner of the page (not the window) is (0,0). | |
204 | * Taken from MochiKit.Signal | |
205 | */ | |
206 | Dygraph.pageX = function(e) { | |
207 | if (e.pageX) { | |
208 | return (!e.pageX || e.pageX < 0) ? 0 : e.pageX; | |
209 | } else { | |
210 | var de = document; | |
211 | var b = document.body; | |
212 | return e.clientX + | |
213 | (de.scrollLeft || b.scrollLeft) - | |
214 | (de.clientLeft || 0); | |
215 | } | |
216 | }; | |
217 | ||
218 | /** | |
219 | * @private | |
220 | * Returns the y-coordinate of the event in a coordinate system where the | |
221 | * top-left corner of the page (not the window) is (0,0). | |
222 | * Taken from MochiKit.Signal | |
223 | */ | |
224 | Dygraph.pageY = function(e) { | |
225 | if (e.pageY) { | |
226 | return (!e.pageY || e.pageY < 0) ? 0 : e.pageY; | |
227 | } else { | |
228 | var de = document; | |
229 | var b = document.body; | |
230 | return e.clientY + | |
231 | (de.scrollTop || b.scrollTop) - | |
232 | (de.clientTop || 0); | |
233 | } | |
234 | }; | |
235 | ||
236 | /** | |
237 | * @private | |
238 | * @param { Number } x The number to consider. | |
239 | * @return { Boolean } Whether the number is zero or NaN. | |
240 | */ | |
241 | // TODO(danvk): rename this function to something like 'isNonZeroNan'. | |
242 | Dygraph.isOK = function(x) { | |
243 | return x && !isNaN(x); | |
244 | }; | |
245 | ||
246 | /** | |
247 | * Number formatting function which mimicks the behavior of %g in printf, i.e. | |
248 | * either exponential or fixed format (without trailing 0s) is used depending on | |
249 | * the length of the generated string. The advantage of this format is that | |
250 | * there is a predictable upper bound on the resulting string length, | |
251 | * significant figures are not dropped, and normal numbers are not displayed in | |
252 | * exponential notation. | |
253 | * | |
254 | * NOTE: JavaScript's native toPrecision() is NOT a drop-in replacement for %g. | |
255 | * It creates strings which are too long for absolute values between 10^-4 and | |
256 | * 10^-6, e.g. '0.00001' instead of '1e-5'. See tests/number-format.html for | |
257 | * output examples. | |
258 | * | |
259 | * @param {Number} x The number to format | |
260 | * @param {Number} opt_precision The precision to use, default 2. | |
261 | * @return {String} A string formatted like %g in printf. The max generated | |
262 | * string length should be precision + 6 (e.g 1.123e+300). | |
263 | */ | |
264 | Dygraph.floatFormat = function(x, opt_precision) { | |
265 | // Avoid invalid precision values; [1, 21] is the valid range. | |
266 | var p = Math.min(Math.max(1, opt_precision || 2), 21); | |
267 | ||
268 | // This is deceptively simple. The actual algorithm comes from: | |
269 | // | |
270 | // Max allowed length = p + 4 | |
271 | // where 4 comes from 'e+n' and '.'. | |
272 | // | |
273 | // Length of fixed format = 2 + y + p | |
274 | // where 2 comes from '0.' and y = # of leading zeroes. | |
275 | // | |
276 | // Equating the two and solving for y yields y = 2, or 0.00xxxx which is | |
277 | // 1.0e-3. | |
278 | // | |
279 | // Since the behavior of toPrecision() is identical for larger numbers, we | |
280 | // don't have to worry about the other bound. | |
281 | // | |
282 | // Finally, the argument for toExponential() is the number of trailing digits, | |
283 | // so we take off 1 for the value before the '.'. | |
284 | return (Math.abs(x) < 1.0e-3 && x != 0.0) ? | |
285 | x.toExponential(p - 1) : x.toPrecision(p); | |
286 | }; | |
287 | ||
288 | /** | |
289 | * @private | |
290 | * Converts '9' to '09' (useful for dates) | |
291 | */ | |
292 | Dygraph.zeropad = function(x) { | |
293 | if (x < 10) return "0" + x; else return "" + x; | |
294 | }; | |
295 | ||
296 | /** | |
297 | * Return a string version of the hours, minutes and seconds portion of a date. | |
298 | * @param {Number} date The JavaScript date (ms since epoch) | |
299 | * @return {String} A time of the form "HH:MM:SS" | |
300 | * @private | |
301 | */ | |
302 | Dygraph.hmsString_ = function(date) { | |
303 | var zeropad = Dygraph.zeropad; | |
304 | var d = new Date(date); | |
305 | if (d.getSeconds()) { | |
306 | return zeropad(d.getHours()) + ":" + | |
307 | zeropad(d.getMinutes()) + ":" + | |
308 | zeropad(d.getSeconds()); | |
309 | } else { | |
310 | return zeropad(d.getHours()) + ":" + zeropad(d.getMinutes()); | |
311 | } | |
312 | }; | |
313 | ||
314 | /** | |
315 | * Convert a JS date (millis since epoch) to YYYY/MM/DD | |
316 | * @param {Number} date The JavaScript date (ms since epoch) | |
317 | * @return {String} A date of the form "YYYY/MM/DD" | |
318 | * @private | |
319 | */ | |
320 | Dygraph.dateString_ = function(date) { | |
321 | var zeropad = Dygraph.zeropad; | |
322 | var d = new Date(date); | |
323 | ||
324 | // Get the year: | |
325 | var year = "" + d.getFullYear(); | |
326 | // Get a 0 padded month string | |
327 | var month = zeropad(d.getMonth() + 1); //months are 0-offset, sigh | |
328 | // Get a 0 padded day string | |
329 | var day = zeropad(d.getDate()); | |
330 | ||
331 | var ret = ""; | |
332 | var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); | |
333 | if (frac) ret = " " + Dygraph.hmsString_(date); | |
334 | ||
335 | return year + "/" + month + "/" + day + ret; | |
336 | }; | |
337 | ||
338 | /** | |
339 | * Round a number to the specified number of digits past the decimal point. | |
340 | * @param {Number} num The number to round | |
341 | * @param {Number} places The number of decimals to which to round | |
342 | * @return {Number} The rounded number | |
343 | * @private | |
344 | */ | |
345 | Dygraph.round_ = function(num, places) { | |
346 | var shift = Math.pow(10, places); | |
347 | return Math.round(num * shift)/shift; | |
348 | }; | |
349 | ||
350 | /** | |
351 | * @private | |
352 | * Implementation of binary search over an array. | |
353 | * Currently does not work when val is outside the range of arry's values. | |
354 | * @param { Integer } val the value to search for | |
355 | * @param { Integer[] } arry is the value over which to search | |
356 | * @param { Integer } abs If abs > 0, find the lowest entry greater than val | |
357 | * If abs < 0, find the highest entry less than val. | |
358 | * if abs == 0, find the entry that equals val. | |
359 | * @param { Integer } [low] The first index in arry to consider (optional) | |
360 | * @param { Integer } [high] The last index in arry to consider (optional) | |
361 | */ | |
362 | Dygraph.binarySearch = function(val, arry, abs, low, high) { | |
363 | if (low == null || high == null) { | |
364 | low = 0; | |
365 | high = arry.length - 1; | |
366 | } | |
367 | if (low > high) { | |
368 | return -1; | |
369 | } | |
370 | if (abs == null) { | |
371 | abs = 0; | |
372 | } | |
373 | var validIndex = function(idx) { | |
374 | return idx >= 0 && idx < arry.length; | |
375 | } | |
376 | var mid = parseInt((low + high) / 2); | |
377 | var element = arry[mid]; | |
378 | if (element == val) { | |
379 | return mid; | |
380 | } | |
381 | if (element > val) { | |
382 | if (abs > 0) { | |
383 | // Accept if element > val, but also if prior element < val. | |
384 | var idx = mid - 1; | |
385 | if (validIndex(idx) && arry[idx] < val) { | |
386 | return mid; | |
387 | } | |
388 | } | |
389 | return Dygraph.binarySearch(val, arry, abs, low, mid - 1); | |
390 | } | |
391 | if (element < val) { | |
392 | if (abs < 0) { | |
393 | // Accept if element < val, but also if prior element > val. | |
394 | var idx = mid + 1; | |
395 | if (validIndex(idx) && arry[idx] > val) { | |
396 | return mid; | |
397 | } | |
398 | } | |
399 | return Dygraph.binarySearch(val, arry, abs, mid + 1, high); | |
400 | } | |
401 | }; | |
402 | ||
403 | /** | |
404 | * @private | |
405 | * Parses a date, returning the number of milliseconds since epoch. This can be | |
406 | * passed in as an xValueParser in the Dygraph constructor. | |
407 | * TODO(danvk): enumerate formats that this understands. | |
408 | * @param {String} A date in YYYYMMDD format. | |
409 | * @return {Number} Milliseconds since epoch. | |
410 | */ | |
411 | Dygraph.dateParser = function(dateStr) { | |
412 | var dateStrSlashed; | |
413 | var d; | |
414 | if (dateStr.search("-") != -1) { // e.g. '2009-7-12' or '2009-07-12' | |
415 | dateStrSlashed = dateStr.replace("-", "/", "g"); | |
416 | while (dateStrSlashed.search("-") != -1) { | |
417 | dateStrSlashed = dateStrSlashed.replace("-", "/"); | |
418 | } | |
419 | d = Dygraph.dateStrToMillis(dateStrSlashed); | |
420 | } else if (dateStr.length == 8) { // e.g. '20090712' | |
421 | // TODO(danvk): remove support for this format. It's confusing. | |
422 | dateStrSlashed = dateStr.substr(0,4) + "/" + dateStr.substr(4,2) | |
423 | + "/" + dateStr.substr(6,2); | |
424 | d = Dygraph.dateStrToMillis(dateStrSlashed); | |
425 | } else { | |
426 | // Any format that Date.parse will accept, e.g. "2009/07/12" or | |
427 | // "2009/07/12 12:34:56" | |
428 | d = Dygraph.dateStrToMillis(dateStr); | |
429 | } | |
430 | ||
431 | if (!d || isNaN(d)) { | |
432 | Dygraph.error("Couldn't parse " + dateStr + " as a date"); | |
433 | } | |
434 | return d; | |
435 | }; | |
436 | ||
437 | /** | |
438 | * @private | |
439 | * This is identical to JavaScript's built-in Date.parse() method, except that | |
440 | * it doesn't get replaced with an incompatible method by aggressive JS | |
441 | * libraries like MooTools or Joomla. | |
442 | * @param { String } str The date string, e.g. "2011/05/06" | |
443 | * @return { Integer } millis since epoch | |
444 | */ | |
445 | Dygraph.dateStrToMillis = function(str) { | |
446 | return new Date(str).getTime(); | |
447 | }; | |
448 | ||
449 | // These functions are all based on MochiKit. | |
450 | /** | |
451 | * Copies all the properties from o to self. | |
452 | * | |
453 | * @private | |
454 | */ | |
455 | Dygraph.update = function (self, o) { | |
456 | if (typeof(o) != 'undefined' && o !== null) { | |
457 | for (var k in o) { | |
458 | if (o.hasOwnProperty(k)) { | |
459 | self[k] = o[k]; | |
460 | } | |
461 | } | |
462 | } | |
463 | return self; | |
464 | }; | |
465 | ||
466 | /** | |
467 | * @private | |
468 | */ | |
469 | Dygraph.isArrayLike = function (o) { | |
470 | var typ = typeof(o); | |
471 | if ( | |
472 | (typ != 'object' && !(typ == 'function' && | |
473 | typeof(o.item) == 'function')) || | |
474 | o === null || | |
475 | typeof(o.length) != 'number' || | |
476 | o.nodeType === 3 | |
477 | ) { | |
478 | return false; | |
479 | } | |
480 | return true; | |
481 | }; | |
482 | ||
483 | /** | |
484 | * @private | |
485 | */ | |
486 | Dygraph.isDateLike = function (o) { | |
487 | if (typeof(o) != "object" || o === null || | |
488 | typeof(o.getTime) != 'function') { | |
489 | return false; | |
490 | } | |
491 | return true; | |
492 | }; | |
493 | ||
494 | /** | |
495 | * @private | |
496 | */ | |
497 | Dygraph.clone = function(o) { | |
498 | // TODO(danvk): figure out how MochiKit's version works | |
499 | var r = []; | |
500 | for (var i = 0; i < o.length; i++) { | |
501 | if (Dygraph.isArrayLike(o[i])) { | |
502 | r.push(Dygraph.clone(o[i])); | |
503 | } else { | |
504 | r.push(o[i]); | |
505 | } | |
506 | } | |
507 | return r; | |
508 | }; | |
509 | ||
510 | /** | |
511 | * @private | |
512 | * Create a new canvas element. This is more complex than a simple | |
513 | * document.createElement("canvas") because of IE and excanvas. | |
514 | */ | |
515 | Dygraph.createCanvas = function() { | |
516 | var canvas = document.createElement("canvas"); | |
517 | ||
518 | isIE = (/MSIE/.test(navigator.userAgent) && !window.opera); | |
519 | if (isIE && (typeof(G_vmlCanvasManager) != 'undefined')) { | |
520 | canvas = G_vmlCanvasManager.initElement(canvas); | |
521 | } | |
522 | ||
523 | return canvas; | |
524 | }; |