code: function rToW (r, x, y) {
      return { x: x * r.scale + r.center.x, y: y * r.scale + r.center.y };
  }
docs: /* eslint no-unused-vars: ["off"] 
  R coordinates to World
  @param {RSys} r - ref. of the passed coordinates
  @param {number} x - x coordinate in r
  @param {number} y - y coordinate in r
  @return {RPoint} World coordinates