findCollapseIndex method
Implementation
bool findCollapseIndex(
SegmentNode ei0, SegmentNode ei1, List<int> collapsedVertexIndex) {
// only looking for equal nodes
if (!ei0.coord.equals2D(ei1.coord)) return false;
int numVerticesBetween = ei1.segmentIndex - ei0.segmentIndex;
if (!ei1.isInterior()) {
numVerticesBetween--;
}
// if there is a single vertex between the two equal nodes, this is a collapse
if (numVerticesBetween == 1) {
collapsedVertexIndex[0] = ei0.segmentIndex + 1;
return true;
}
return false;
}