@odopod/odo-hotspots/demos/scripts/raf.js

A component which positions and opens hotspots.

// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel

// MIT license

'use strict';

var lastTime = 0;
var vendors = ['ms', 'moz', 'webkit', 'o'];
for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
  window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
  window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame'];
}

if (!window.requestAnimationFrame) {
  window.requestAnimationFrame = function(callback) {
    var currTime = new Date().getTime();
    var timeToCall = Math.max(0, 16 - (currTime - lastTime));
    var id = window.setTimeout(function() {
        callback(currTime + timeToCall);
      },
      timeToCall);
    lastTime = currTime + timeToCall;
    return id;
  };
}

if (!window.cancelAnimationFrame) {
  window.cancelAnimationFrame = function(id) {
    clearTimeout(id);
  };
}