checkDD method
Implementation
void checkDD(Coordinate p1, Coordinate p2, Coordinate q1, Coordinate q2,
Coordinate intPt) {
Coordinate? intPtDD = CGAlgorithmsDD.intersection(p1, p2, q1, q2);
bool isIn = isInSegmentEnvelopes(intPtDD!);
print("DD in env = $isIn --------------------- $intPtDD");
if (intPt.distance(intPtDD) > 0.0001) {
print("Distance = ${intPt.distance(intPtDD)}");
}
}