public function calculateIntersection(line: Line) : Point
  {
   const x11: Number = this.point1.x;
   const y11: Number = this.point1.y;
   const x12: Number = this.point2.x;
   const y12: Number = this.point2.y;

   const x21: Number = line.point1.x;
   const y21: Number = line.point1.y;
   const x22: Number = line.point2.x;
   const y22: Number = line.point2.y;

   if (this.isSegment && line.isSegment)
   {
    if (Math.min(x11, x12) > Math.max(x21, x22) || Math.max(x11, x12) < Math.min(x21, x22)) return null;
    if (Math.min(y11, y12) > Math.max(y21, y22) || Math.max(y11, y12) < Math.min(y21, y22)) return null;
   }

   const fseX: Number = x12 - x11;
   const fseY: Number = y12 - y11;

   const sseX: Number = x22 - x21;
   const sseY: Number = y22 - y21;

   const sfsX: Number = x11 - x21;
   const sfsY: Number = y11 - y21;

   const denominator: Number = fseX * sseY - fseY * sseX;
   const a: Number = sseX * sfsY - sfsX * sseY;

   if (denominator == 0) return null;

   var u: Number = a / denominator;

   if (this.isSegment && (u < 0.0 || u > 1.0)) return null;

   const b: Number = fseX * sfsY - sfsX * fseY;
   var u2: Number = b / denominator;

   if (line.isSegment && (u2 < 0.0 || u2 > 1.0)) return null;

   const rx: Number = x11 + fseX * u;
   const ry: Number = y11 + fseY * u;

   return new Point(MathUtils.round(rx, 10), MathUtils.round(ry, 10));
  }