Lee182

function scrollControl() {

  // left: 37, up: 38, right: 39, down: 40,
  // spacebar: 32, pageup: 33, pagedown: 34, end: 35, home: 36
  var keys = {37: 1, 38: 1, 39: 1, 40: 1}


  function preventDefault(e){
    e.preventDefault()
    e.returnValue = false

Lee182

function getFrameRate(ms) {
  var i = -1
  var run = true
  function tick() {
    if (run === false) {return}
    i++
    window.requestAnimationFrame(tick)
  }
  
  return new Promise(function(resolve){

Lee182

function flatten(arr) {
  var ans = []
  arr.forEach(function(ar){
    if ( Array.isArray(ar) ) { ans = ans.concat( flatten(ar) ) }
    else { ans.push(ar) }
  })
  return ans
}

Lee182

var get = function get(url) {
  return promise = new Promise(function(done, reject) {
    var req = new XMLHttpRequest()
    req.onload = function() {
      done(req.response)
    };
    req.onerror = function(e) {
      reject(e)
    }
    req.open('get', url, true);