code: function translate(tx) {
      var ty = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
  
      return {
          a: 1, c: 0, e: tx,
          b: 0, d: 1, f: ty
      };
  }
docs: Calculate a translate matrix
  @param tx Translation on axis x
  @param [ty = 0] Translation on axis y
  @returns {{a: number, b: number, c: number, e: number, d: number, f: number}} Affine matrix