public method calculateArea() {
            Node n = this.head;

            while (0 != n)
            {
                if (0 == n.prev)
                {
                    this.area += (this.property_originX + n.relativeX * this.cos) * (this.property_originY + this.head.relativeY * this.sin);
                    this.area -= (this.property_originY + n.relativeY * this.sin) * (this.property_originX + this.head.relativeX * this.cos);
                }
                else
                {
                    this.area += (this.property_originX + n.relativeX * this.cos) * (this.property_originY + n.prev.relativeY * this.sin);
                    this.area -= (this.property_originY + n.relativeY * this.sin) * (this.property_originX + n.prev.relativeX * this.cos);
                }

                n = n.prev;
            }

            this.area = area / 2.;

            BJDebugMsg("Area: " + R2S(this.area));
        }