/** Compute the change in depth as an edge is crossed from R to L */
private static int depthDelta(Label label) {
int lLoc = label.getLocation(0, Position.LEFT);
int rLoc = label.getLocation(0, Position.RIGHT);
if (lLoc == Location.INTERIOR && rLoc == Location.EXTERIOR) return 1;
else if (lLoc == Location.EXTERIOR && rLoc == Location.INTERIOR) return -1;
return 0;
}
/**
* The location for a given eltIndex for a node will be one of { null, INTERIOR, BOUNDARY }. A
* node may be on both the boundary and the interior of a geometry; in this case, the rule is that
* the node is considered to be in the boundary. The merged location is the maximum of the two
* input values.
*/
int computeMergedLocation(Label label2, int eltIndex) {
int loc = Location.NONE;
loc = label.getLocation(eltIndex);
if (!label2.isNull(eltIndex)) {
int nLoc = label2.getLocation(eltIndex);
if (loc != Location.BOUNDARY) loc = nLoc;
}
return loc;
}