checkintersect.cs

/// <summary>
        /// Check  Intersect Between Two Curve
        /// </summary>
        /// <param name="c1"></param>
        /// <param name="c2"></param>
        /// <returns></returns>
        public static XYZ Intersection(this Curve c1, Curve c2)
        {
            XYZ p1 = c1.GetEndPoint(0);
            XYZ q1 = c1.GetEndPoint(1);
            XYZ p2 = c2.GetEndPoint(0);
            XYZ q2 = c2.GetEndPoint(1);
            XYZ v1 = q1 - p1;
            XYZ v2 = q2 - p2;
            XYZ w = p2 - p1;
            XYZ p5 = null;
            double c = (v2.X * w.Y - v2.Y * w.X)
                       / (v2.X * v1.Y - v2.Y * v1.X);
            if (!double.IsInfinity(c))
            {
                double x = p1.X + c * v1.X;
                double y = p1.Y + c * v1.Y;
                p5 = new XYZ(x, y, 0);
            }
            return p5;
        }