isBoundaryPoint method
Implementation
bool isBoundaryPoint(LineIntersector li, List<List>? bdyNodes) {
if (bdyNodes == null) return false;
if (isBoundaryPointInternal(li, bdyNodes[0].cast<Node>())) return true;
if (isBoundaryPointInternal(li, bdyNodes[1].cast<Node>())) return true;
return false;
}