dygraph-utils.js

   1 /**
   2  * @license
   3  * Copyright 2011 Dan Vanderkam (danvdk@gmail.com)
   4  * MIT-licensed (http://opensource.org/licenses/MIT)
   5  */
   6
   7 /**
   8  * @fileoverview This file contains utility functions used by dygraphs. These
   9  * are typically static (i.e. not related to any particular dygraph). Examples
  10  * include date/time formatting functions, basic algorithms (e.g. binary
  11  * search) and generic DOM-manipulation functions.
  12  */
  13
  14 "use strict";
  15
  16 Dygraph.LOG_SCALE = 10;
  17 Dygraph.LN_TEN = Math.log(Dygraph.LOG_SCALE);
  18
  19 /** @private */
  20 Dygraph.log10 = function(x) {
  21   return Math.log(x) / Dygraph.LN_TEN;
  22 }
  23
  24 // Various logging levels.
  25 Dygraph.DEBUG = 1;
  26 Dygraph.INFO = 2;
  27 Dygraph.WARNING = 3;
  28 Dygraph.ERROR = 3;
  29
  30 // Set this to log stack traces on warnings, etc.
  31 // This requires stacktrace.js, which is up to you to provide.
  32 // A copy can be found in the dygraphs repo, or at
  33 // https://github.com/eriwen/javascript-stacktrace
  34 Dygraph.LOG_STACK_TRACES = false;
  35
  36 /**
  37  * @private
  38  * Log an error on the JS console at the given severity.
  39  * @param { Integer } severity One of Dygraph.{DEBUG,INFO,WARNING,ERROR}
  40  * @param { String } The message to log.
  41  */
  42 Dygraph.log = function(severity, message) {
  43   var st;
  44   if (typeof(printStackTrace) != 'undefined') {
  45     // Remove uninteresting bits: logging functions and paths.
  46     var st = printStackTrace({guess:false});
  47     while (st[0].indexOf("stacktrace") != -1) {
  48       st.splice(0, 1);
  49     }
  50
  51     st.splice(0, 2);
  52     for (var i = 0; i < st.length; i++) {
  53       st[i] = st[i].replace(/\([^)]*\/(.*)\)/, '@$1')
  54           .replace(/\@.*\/([^\/]*)/, '@$1')
  55           .replace('[object Object].', '');
  56     }
  57     var top_msg = st.splice(0, 1)[0];
  58     message += ' (' + top_msg.replace(/^.*@ ?/, '') + ')';
  59   }
  60
  61   if (typeof(console) != 'undefined') {
  62     switch (severity) {
  63       case Dygraph.DEBUG:
  64         console.debug('dygraphs: ' + message);
  65         break;
  66       case Dygraph.INFO:
  67         console.info('dygraphs: ' + message);
  68         break;
  69       case Dygraph.WARNING:
  70         console.warn('dygraphs: ' + message);
  71         break;
  72       case Dygraph.ERROR:
  73         console.error('dygraphs: ' + message);
  74         break;
  75     }
  76   }
  77
  78   if (Dygraph.LOG_STACK_TRACES) {
  79     console.log(st.join('\n'));
  80   }
  81 };
  82
  83 /** @private */
  84 Dygraph.info = function(message) {
  85   Dygraph.log(Dygraph.INFO, message);
  86 };
  87 /** @private */
  88 Dygraph.prototype.info = Dygraph.info;
  89
  90 /** @private */
  91 Dygraph.warn = function(message) {
  92   Dygraph.log(Dygraph.WARNING, message);
  93 };
  94 /** @private */
  95 Dygraph.prototype.warn = Dygraph.warn;
  96
  97 /** @private */
  98 Dygraph.error = function(message) {
  99   Dygraph.log(Dygraph.ERROR, message);
 100 };
 101 /** @private */
 102 Dygraph.prototype.error = Dygraph.error;
 103
 104 /**
 105  * @private
 106  * Return the 2d context for a dygraph canvas.
 107  *
 108  * This method is only exposed for the sake of replacing the function in
 109  * automated tests, e.g.
 110  *
 111  * var oldFunc = Dygraph.getContext();
 112  * Dygraph.getContext = function(canvas) {
 113  *   var realContext = oldFunc(canvas);
 114  *   return new Proxy(realContext);
 115  * };
 116  */
 117 Dygraph.getContext = function(canvas) {
 118   return canvas.getContext("2d");
 119 };
 120
 121 /**
 122  * @private
 123  * Add an event handler. This smooths a difference between IE and the rest of
 124  * the world.
 125  * @param { DOM element } elem The element to add the event to.
 126  * @param { String } type The type of the event, e.g. 'click' or 'mousemove'.
 127  * @param { Function } fn The function to call on the event. The function takes
 128  * one parameter: the event object.
 129  */
 130 Dygraph.addEvent = function addEvent(elem, type, fn) {
 131   if (elem.addEventListener) {
 132     elem.addEventListener(type, fn, false);
 133   } else {
 134     elem[type+fn] = function(){fn(window.event);};
 135     elem.attachEvent('on'+type, elem[type+fn]);
 136   }
 137 };
 138
 139 /**
 140  * @private
 141  * Remove an event handler. This smooths a difference between IE and the rest of
 142  * the world.
 143  * @param { DOM element } elem The element to add the event to.
 144  * @param { String } type The type of the event, e.g. 'click' or 'mousemove'.
 145  * @param { Function } fn The function to call on the event. The function takes
 146  * one parameter: the event object.
 147  */
 148 Dygraph.removeEvent = function addEvent(elem, type, fn) {
 149   if (elem.removeEventListener) {
 150     elem.removeEventListener(type, fn, false);
 151   } else {
 152     elem.detachEvent('on'+type, elem[type+fn]);
 153     elem[type+fn] = null;
 154   }
 155 };
 156
 157 /**
 158  * @private
 159  * Cancels further processing of an event. This is useful to prevent default
 160  * browser actions, e.g. highlighting text on a double-click.
 161  * Based on the article at
 162  * http://www.switchonthecode.com/tutorials/javascript-tutorial-the-scroll-wheel
 163  * @param { Event } e The event whose normal behavior should be canceled.
 164  */
 165 Dygraph.cancelEvent = function(e) {
 166   e = e ? e : window.event;
 167   if (e.stopPropagation) {
 168     e.stopPropagation();
 169   }
 170   if (e.preventDefault) {
 171     e.preventDefault();
 172   }
 173   e.cancelBubble = true;
 174   e.cancel = true;
 175   e.returnValue = false;
 176   return false;
 177 };
 178
 179 /**
 180  * Convert hsv values to an rgb(r,g,b) string. Taken from MochiKit.Color. This
 181  * is used to generate default series colors which are evenly spaced on the
 182  * color wheel.
 183  * @param { Number } hue Range is 0.0-1.0.
 184  * @param { Number } saturation Range is 0.0-1.0.
 185  * @param { Number } value Range is 0.0-1.0.
 186  * @return { String } "rgb(r,g,b)" where r, g and b range from 0-255.
 187  * @private
 188  */
 189 Dygraph.hsvToRGB = function (hue, saturation, value) {
 190   var red;
 191   var green;
 192   var blue;
 193   if (saturation === 0) {
 194     red = value;
 195     green = value;
 196     blue = value;
 197   } else {
 198     var i = Math.floor(hue * 6);
 199     var f = (hue * 6) - i;
 200     var p = value * (1 - saturation);
 201     var q = value * (1 - (saturation * f));
 202     var t = value * (1 - (saturation * (1 - f)));
 203     switch (i) {
 204       case 1: red = q; green = value; blue = p; break;
 205       case 2: red = p; green = value; blue = t; break;
 206       case 3: red = p; green = q; blue = value; break;
 207       case 4: red = t; green = p; blue = value; break;
 208       case 5: red = value; green = p; blue = q; break;
 209       case 6: // fall through
 210       case 0: red = value; green = t; blue = p; break;
 211     }
 212   }
 213   red = Math.floor(255 * red + 0.5);
 214   green = Math.floor(255 * green + 0.5);
 215   blue = Math.floor(255 * blue + 0.5);
 216   return 'rgb(' + red + ',' + green + ',' + blue + ')';
 217 };
 218
 219 // The following functions are from quirksmode.org with a modification for Safari from
 220 // http://blog.firetree.net/2005/07/04/javascript-find-position/
 221 // http://www.quirksmode.org/js/findpos.html
 222 // ... and modifications to support scrolling divs.
 223
 224 /**
 225  * Find the x-coordinate of the supplied object relative to the left side
 226  * of the page.
 227  * @private
 228  */
 229 Dygraph.findPosX = function(obj) {
 230   var curleft = 0;
 231   if(obj.offsetParent) {
 232     var copyObj = obj;
 233     while(1) {
 234       curleft += copyObj.offsetLeft;
 235       if(!copyObj.offsetParent) {
 236         break;
 237       }
 238       copyObj = copyObj.offsetParent;
 239     }
 240   } else if(obj.x) {
 241     curleft += obj.x;
 242   }
 243   // This handles the case where the object is inside a scrolled div.
 244   while(obj && obj != document.body) {
 245     curleft -= obj.scrollLeft;
 246     obj = obj.parentNode;
 247   }
 248   return curleft;
 249 };
 250
 251 /**
 252  * Find the y-coordinate of the supplied object relative to the top of the
 253  * page.
 254  * @private
 255  */
 256 Dygraph.findPosY = function(obj) {
 257   var curtop = 0;
 258   if(obj.offsetParent) {
 259     var copyObj = obj;
 260     while(1) {
 261       curtop += copyObj.offsetTop;
 262       if(!copyObj.offsetParent) {
 263         break;
 264       }
 265       copyObj = copyObj.offsetParent;
 266     }
 267   } else if(obj.y) {
 268     curtop += obj.y;
 269   }
 270   // This handles the case where the object is inside a scrolled div.
 271   while(obj && obj != document.body) {
 272     curtop -= obj.scrollTop;
 273     obj = obj.parentNode;
 274   }
 275   return curtop;
 276 };
 277
 278 /**
 279  * @private
 280  * Returns the x-coordinate of the event in a coordinate system where the
 281  * top-left corner of the page (not the window) is (0,0).
 282  * Taken from MochiKit.Signal
 283  */
 284 Dygraph.pageX = function(e) {
 285   if (e.pageX) {
 286     return (!e.pageX || e.pageX < 0) ? 0 : e.pageX;
 287   } else {
 288     var de = document;
 289     var b = document.body;
 290     return e.clientX +
 291         (de.scrollLeft || b.scrollLeft) -
 292         (de.clientLeft || 0);
 293   }
 294 };
 295
 296 /**
 297  * @private
 298  * Returns the y-coordinate of the event in a coordinate system where the
 299  * top-left corner of the page (not the window) is (0,0).
 300  * Taken from MochiKit.Signal
 301  */
 302 Dygraph.pageY = function(e) {
 303   if (e.pageY) {
 304     return (!e.pageY || e.pageY < 0) ? 0 : e.pageY;
 305   } else {
 306     var de = document;
 307     var b = document.body;
 308     return e.clientY +
 309         (de.scrollTop || b.scrollTop) -
 310         (de.clientTop || 0);
 311   }
 312 };
 313
 314 /**
 315  * @private
 316  * @param { Number } x The number to consider.
 317  * @return { Boolean } Whether the number is zero or NaN.
 318  */
 319 // TODO(danvk): rename this function to something like 'isNonZeroNan'.
 320 Dygraph.isOK = function(x) {
 321   return x && !isNaN(x);
 322 };
 323
 324 /**
 325  * Number formatting function which mimicks the behavior of %g in printf, i.e.
 326  * either exponential or fixed format (without trailing 0s) is used depending on
 327  * the length of the generated string.  The advantage of this format is that
 328  * there is a predictable upper bound on the resulting string length,
 329  * significant figures are not dropped, and normal numbers are not displayed in
 330  * exponential notation.
 331  *
 332  * NOTE: JavaScript's native toPrecision() is NOT a drop-in replacement for %g.
 333  * It creates strings which are too long for absolute values between 10^-4 and
 334  * 10^-6, e.g. '0.00001' instead of '1e-5'. See tests/number-format.html for
 335  * output examples.
 336  *
 337  * @param {Number} x The number to format
 338  * @param {Number} opt_precision The precision to use, default 2.
 339  * @return {String} A string formatted like %g in printf.  The max generated
 340  *                  string length should be precision + 6 (e.g 1.123e+300).
 341  */
 342 Dygraph.floatFormat = function(x, opt_precision) {
 343   // Avoid invalid precision values; [1, 21] is the valid range.
 344   var p = Math.min(Math.max(1, opt_precision || 2), 21);
 345
 346   // This is deceptively simple.  The actual algorithm comes from:
 347   //
 348   // Max allowed length = p + 4
 349   // where 4 comes from 'e+n' and '.'.
 350   //
 351   // Length of fixed format = 2 + y + p
 352   // where 2 comes from '0.' and y = # of leading zeroes.
 353   //
 354   // Equating the two and solving for y yields y = 2, or 0.00xxxx which is
 355   // 1.0e-3.
 356   //
 357   // Since the behavior of toPrecision() is identical for larger numbers, we
 358   // don't have to worry about the other bound.
 359   //
 360   // Finally, the argument for toExponential() is the number of trailing digits,
 361   // so we take off 1 for the value before the '.'.
 362   return (Math.abs(x) < 1.0e-3 && x != 0.0) ?
 363       x.toExponential(p - 1) : x.toPrecision(p);
 364 };
 365
 366 /**
 367  * @private
 368  * Converts '9' to '09' (useful for dates)
 369  */
 370 Dygraph.zeropad = function(x) {
 371   if (x < 10) return "0" + x; else return "" + x;
 372 };
 373
 374 /**
 375  * Return a string version of the hours, minutes and seconds portion of a date.
 376  * @param {Number} date The JavaScript date (ms since epoch)
 377  * @return {String} A time of the form "HH:MM:SS"
 378  * @private
 379  */
 380 Dygraph.hmsString_ = function(date) {
 381   var zeropad = Dygraph.zeropad;
 382   var d = new Date(date);
 383   if (d.getSeconds()) {
 384     return zeropad(d.getHours()) + ":" +
 385            zeropad(d.getMinutes()) + ":" +
 386            zeropad(d.getSeconds());
 387   } else {
 388     return zeropad(d.getHours()) + ":" + zeropad(d.getMinutes());
 389   }
 390 };
 391
 392 /**
 393  * Round a number to the specified number of digits past the decimal point.
 394  * @param {Number} num The number to round
 395  * @param {Number} places The number of decimals to which to round
 396  * @return {Number} The rounded number
 397  * @private
 398  */
 399 Dygraph.round_ = function(num, places) {
 400   var shift = Math.pow(10, places);
 401   return Math.round(num * shift)/shift;
 402 };
 403
 404 /**
 405  * @private
 406  * Implementation of binary search over an array.
 407  * Currently does not work when val is outside the range of arry's values.
 408  * @param { Integer } val the value to search for
 409  * @param { Integer[] } arry is the value over which to search
 410  * @param { Integer } abs If abs > 0, find the lowest entry greater than val
 411  * If abs < 0, find the highest entry less than val.
 412  * if abs == 0, find the entry that equals val.
 413  * @param { Integer } [low] The first index in arry to consider (optional)
 414  * @param { Integer } [high] The last index in arry to consider (optional)
 415  */
 416 Dygraph.binarySearch = function(val, arry, abs, low, high) {
 417   if (low == null || high == null) {
 418     low = 0;
 419     high = arry.length - 1;
 420   }
 421   if (low > high) {
 422     return -1;
 423   }
 424   if (abs == null) {
 425     abs = 0;
 426   }
 427   var validIndex = function(idx) {
 428     return idx >= 0 && idx < arry.length;
 429   }
 430   var mid = parseInt((low + high) / 2);
 431   var element = arry[mid];
 432   if (element == val) {
 433     return mid;
 434   }
 435   if (element > val) {
 436     if (abs > 0) {
 437       // Accept if element > val, but also if prior element < val.
 438       var idx = mid - 1;
 439       if (validIndex(idx) && arry[idx] < val) {
 440         return mid;
 441       }
 442     }
 443     return Dygraph.binarySearch(val, arry, abs, low, mid - 1);
 444   }
 445   if (element < val) {
 446     if (abs < 0) {
 447       // Accept if element < val, but also if prior element > val.
 448       var idx = mid + 1;
 449       if (validIndex(idx) && arry[idx] > val) {
 450         return mid;
 451       }
 452     }
 453     return Dygraph.binarySearch(val, arry, abs, mid + 1, high);
 454   }
 455 };
 456
 457 /**
 458  * @private
 459  * Parses a date, returning the number of milliseconds since epoch. This can be
 460  * passed in as an xValueParser in the Dygraph constructor.
 461  * TODO(danvk): enumerate formats that this understands.
 462  * @param {String} A date in YYYYMMDD format.
 463  * @return {Number} Milliseconds since epoch.
 464  */
 465 Dygraph.dateParser = function(dateStr) {
 466   var dateStrSlashed;
 467   var d;
 468   if (dateStr.search("-") != -1) {  // e.g. '2009-7-12' or '2009-07-12'
 469     dateStrSlashed = dateStr.replace("-", "/", "g");
 470     while (dateStrSlashed.search("-") != -1) {
 471       dateStrSlashed = dateStrSlashed.replace("-", "/");
 472     }
 473     d = Dygraph.dateStrToMillis(dateStrSlashed);
 474   } else if (dateStr.length == 8) {  // e.g. '20090712'
 475     // TODO(danvk): remove support for this format. It's confusing.
 476     dateStrSlashed = dateStr.substr(0,4) + "/" + dateStr.substr(4,2)
 477                        + "/" + dateStr.substr(6,2);
 478     d = Dygraph.dateStrToMillis(dateStrSlashed);
 479   } else {
 480     // Any format that Date.parse will accept, e.g. "2009/07/12" or
 481     // "2009/07/12 12:34:56"
 482     d = Dygraph.dateStrToMillis(dateStr);
 483   }
 484
 485   if (!d || isNaN(d)) {
 486     Dygraph.error("Couldn't parse " + dateStr + " as a date");
 487   }
 488   return d;
 489 };
 490
 491 /**
 492  * @private
 493  * This is identical to JavaScript's built-in Date.parse() method, except that
 494  * it doesn't get replaced with an incompatible method by aggressive JS
 495  * libraries like MooTools or Joomla.
 496  * @param { String } str The date string, e.g. "2011/05/06"
 497  * @return { Integer } millis since epoch
 498  */
 499 Dygraph.dateStrToMillis = function(str) {
 500   return new Date(str).getTime();
 501 };
 502
 503 // These functions are all based on MochiKit.
 504 /**
 505  * Copies all the properties from o to self.
 506  *
 507  * @private
 508  */
 509 Dygraph.update = function (self, o) {
 510   if (typeof(o) != 'undefined' && o !== null) {
 511     for (var k in o) {
 512       if (o.hasOwnProperty(k)) {
 513         self[k] = o[k];
 514       }
 515     }
 516   }
 517   return self;
 518 };
 519
 520 /**
 521  * Copies all the properties from o to self.
 522  *
 523  * @private
 524  */
 525 Dygraph.updateDeep = function (self, o) {
 526   // Taken from http://stackoverflow.com/questions/384286/javascript-isdom-how-do-you-check-if-a-javascript-object-is-a-dom-object
 527   function isNode(o) {
 528     return (
 529       typeof Node === "object" ? o instanceof Node :
 530       typeof o === "object" && typeof o.nodeType === "number" && typeof o.nodeName==="string"
 531     );
 532   }
 533
 534   if (typeof(o) != 'undefined' && o !== null) {
 535     for (var k in o) {
 536       if (o.hasOwnProperty(k)) {
 537         if (o[k] == null) {
 538           self[k] = null;
 539         } else if (Dygraph.isArrayLike(o[k])) {
 540           self[k] = o[k].slice();
 541         } else if (isNode(o[k])) {
 542           // DOM objects are shallowly-copied.
 543           self[k] = o[k];
 544         } else if (typeof(o[k]) == 'object') {
 545           if (typeof(self[k]) != 'object') {
 546             self[k] = {};
 547           }
 548           Dygraph.updateDeep(self[k], o[k]);
 549         } else {
 550           self[k] = o[k];
 551         }
 552       }
 553     }
 554   }
 555   return self;
 556 };
 557
 558 /**
 559  * @private
 560  */
 561 Dygraph.isArrayLike = function (o) {
 562   var typ = typeof(o);
 563   if (
 564       (typ != 'object' && !(typ == 'function' &&
 565         typeof(o.item) == 'function')) ||
 566       o === null ||
 567       typeof(o.length) != 'number' ||
 568       o.nodeType === 3
 569      ) {
 570     return false;
 571   }
 572   return true;
 573 };
 574
 575 /**
 576  * @private
 577  */
 578 Dygraph.isDateLike = function (o) {
 579   if (typeof(o) != "object" || o === null ||
 580       typeof(o.getTime) != 'function') {
 581     return false;
 582   }
 583   return true;
 584 };
 585
 586 /**
 587  * Note: this only seems to work for arrays.
 588  * @private
 589  */
 590 Dygraph.clone = function(o) {
 591   // TODO(danvk): figure out how MochiKit's version works
 592   var r = [];
 593   for (var i = 0; i < o.length; i++) {
 594     if (Dygraph.isArrayLike(o[i])) {
 595       r.push(Dygraph.clone(o[i]));
 596     } else {
 597       r.push(o[i]);
 598     }
 599   }
 600   return r;
 601 };
 602
 603 /**
 604  * @private
 605  * Create a new canvas element. This is more complex than a simple
 606  * document.createElement("canvas") because of IE and excanvas.
 607  */
 608 Dygraph.createCanvas = function() {
 609   var canvas = document.createElement("canvas");
 610
 611   var isIE = (/MSIE/.test(navigator.userAgent) && !window.opera);
 612   if (isIE && (typeof(G_vmlCanvasManager) != 'undefined')) {
 613     canvas = G_vmlCanvasManager.initElement(canvas);
 614   }
 615
 616   return canvas;
 617 };
 618
 619 /**
 620  * @private
 621  * Call a function N times at a given interval, then call a cleanup function
 622  * once. repeat_fn is called once immediately, then (times - 1) times
 623  * asynchronously. If times=1, then cleanup_fn() is also called synchronously.
 624  * @param repeat_fn {Function} Called repeatedly -- takes the number of calls
 625  * (from 0 to times-1) as an argument.
 626  * @param times {number} The number of times to call repeat_fn
 627  * @param every_ms {number} Milliseconds between calls
 628  * @param cleanup_fn {Function} A function to call after all repeat_fn calls.
 629  * @private
 630  */
 631 Dygraph.repeatAndCleanup = function(repeat_fn, times, every_ms, cleanup_fn) {
 632   var count = 0;
 633   var start_time = new Date().getTime();
 634   repeat_fn(count);
 635   if (times == 1) {
 636     cleanup_fn();
 637     return;
 638   }
 639
 640   (function loop() {
 641     if (count >= times) return;
 642     var target_time = start_time + (1 + count) * every_ms;
 643     setTimeout(function() {
 644       count++;
 645       repeat_fn(count)
 646       if (count >= times - 1) {
 647         cleanup_fn();
 648       } else {
 649         loop();
 650       }
 651     }, target_time - new Date().getTime());
 652     // TODO(danvk): adjust every_ms to produce evenly-timed function calls.
 653   })();
 654 };
 655
 656 /**
 657  * @private
 658  * This function will scan the option list and determine if they
 659  * require us to recalculate the pixel positions of each point.
 660  * @param { List } a list of options to check.
 661  * @return { Boolean } true if the graph needs new points else false.
 662  */
 663 Dygraph.isPixelChangingOptionList = function(labels, attrs) {
 664   // A whitelist of options that do not change pixel positions.
 665   var pixelSafeOptions = {
 666     'annotationClickHandler': true,
 667     'annotationDblClickHandler': true,
 668     'annotationMouseOutHandler': true,
 669     'annotationMouseOverHandler': true,
 670     'axisLabelColor': true,
 671     'axisLineColor': true,
 672     'axisLineWidth': true,
 673     'clickCallback': true,
 674     'digitsAfterDecimal': true,
 675     'drawCallback': true,
 676     'drawPoints': true,
 677     'drawXGrid': true,
 678     'drawYGrid': true,
 679     'fillAlpha': true,
 680     'gridLineColor': true,
 681     'gridLineWidth': true,
 682     'hideOverlayOnMouseOut': true,
 683     'highlightCallback': true,
 684     'highlightCircleSize': true,
 685     'interactionModel': true,
 686     'isZoomedIgnoreProgrammaticZoom': true,
 687     'labelsDiv': true,
 688     'labelsDivStyles': true,
 689     'labelsDivWidth': true,
 690     'labelsKMB': true,
 691     'labelsKMG2': true,
 692     'labelsSeparateLines': true,
 693     'labelsShowZeroValues': true,
 694     'legend': true,
 695     'maxNumberWidth': true,
 696     'panEdgeFraction': true,
 697     'pixelsPerYLabel': true,
 698     'pointClickCallback': true,
 699     'pointSize': true,
 700     'rangeSelectorPlotFillColor': true,
 701     'rangeSelectorPlotStrokeColor': true,
 702     'showLabelsOnHighlight': true,
 703     'showRoller': true,
 704     'sigFigs': true,
 705     'strokeWidth': true,
 706     'underlayCallback': true,
 707     'unhighlightCallback': true,
 708     'xAxisLabelFormatter': true,
 709     'xTicker': true,
 710     'xValueFormatter': true,
 711     'yAxisLabelFormatter': true,
 712     'yValueFormatter': true,
 713     'zoomCallback': true
 714   };
 715
 716   // Assume that we do not require new points.
 717   // This will change to true if we actually do need new points.
 718   var requiresNewPoints = false;
 719
 720   // Create a dictionary of series names for faster lookup.
 721   // If there are no labels, then the dictionary stays empty.
 722   var seriesNamesDictionary = { };
 723   if (labels) {
 724     for (var i = 1; i < labels.length; i++) {
 725       seriesNamesDictionary[labels[i]] = true;
 726     }
 727   }
 728
 729   // Iterate through the list of updated options.
 730   for (var property in attrs) {
 731     // Break early if we already know we need new points from a previous option.
 732     if (requiresNewPoints) {
 733       break;
 734     }
 735     if (attrs.hasOwnProperty(property)) {
 736       // Find out of this field is actually a series specific options list.
 737       if (seriesNamesDictionary[property]) {
 738         // This property value is a list of options for this series.
 739         // If any of these sub properties are not pixel safe, set the flag.
 740         for (var subProperty in attrs[property]) {
 741           // Break early if we already know we need new points from a previous option.
 742           if (requiresNewPoints) {
 743             break;
 744           }
 745           if (attrs[property].hasOwnProperty(subProperty) && !pixelSafeOptions[subProperty]) {
 746             requiresNewPoints = true;
 747           }
 748         }
 749       // If this was not a series specific option list, check if its a pixel changing property.
 750       } else if (!pixelSafeOptions[property]) {
 751         requiresNewPoints = true;
 752       }
 753     }
 754   }
 755
 756   return requiresNewPoints;
 757 };