computeDepth method
Implementation
void computeDepth(int outsideDepth) {
clearVisitedEdges();
// find an outside edge to assign depth to
DirectedEdge de = finder.getEdge()!;
// right side of line returned by finder is on the outside
de.setEdgeDepths(Position.RIGHT, outsideDepth);
copySymDepths(de);
//computeNodeDepth(n, de);
computeDepths(de);
}