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To change rough.js for IE11


Formatted code from debugger
Ran through BabelJs

Replace ** with Math.pow, eg x ** y produces the same result as Math.pow(x,y)
Add 2 polyfills:


if (!Array.from) {
    Array.from = function (object) {
        'use strict';
        return [].slice.call(object);
    };
}

Math.imul = Math.imul || function(a, b) {
  var ah = (a >>> 16) & 0xffff;
  var al = a & 0xffff;
  var bh = (b >>> 16) & 0xffff;
  var bl = b & 0xffff;
  // the shift by 0 fixes the sign on the high part
  // the final |0 converts the unsigned value into a signed value
  return ((al * bl) + (((ah * bl + al * bh) << 16) >>> 0)|0);
};


Minify using java -jar ../../../../../etc/build/compiler.jar rough.js.modified >rough.min.js
Used roughjs 4.4.1 from https://unpkg.com/roughjs@4.4.1/bundled/rough.js via https://www.npmjs.com/package/roughjs