code: function(points, angle) {
      var result = [];
      for(var i=0;i<points.length;i+=2) {
        var x = points[i + 0] * this._size;
        var y = points[i + 1] * this._size;
        var pt = this._rotate([x, y], angle);
        result.push(pt[0]);
        result.push(pt[1]);
      }
      return result;
    }
docs: Rotates the given point-array around the angle. @method _rotateAllPoints @param points {Array} A point vector 2d. @param angle {Number} Angle for rotation [rad]. @return The rotated vector-array 2d.