private void CheckDD(Coordinate p1, Coordinate p2, Coordinate q1,
Coordinate q2, Coordinate intPt)
{
Coordinate intPtDD = CGAlgorithmsDD.Intersection(p1, p2, q1, q2);
bool isIn = IsInSegmentEnvelopes(intPtDD);
Debug.WriteLine("DD in env = " + isIn + " --------------------- " + intPtDD);
double distance = intPt.Distance(intPtDD);
if (distance > 0.0001)
{
Debug.WriteLine("Distance = " + distance);
}
}