scale element

scale.js

window.scaler = function(options) {
  var a, ab, b, c, cd, d, e, f, scale;
  a = options.srcWidth;
  b = options.srcHeight;
  c = options.windowWidth;
  d = options.windowHeight;
  console.log(c, d);
  ab = a / b;
  cd = c / b;
  e = 0;
  f = 0;
  if (ab > cd) {
    e = c;
    f = c * b / a;
  } else {
    e = a * d / b;
    f = d;
  }
  return scale = {
    width: e,
    height: f
  };
};