public void ComputeOverlaps(MonotoneChain mc, MonotoneChainOverlapAction mco)
{
ComputeOverlaps(start, end, mc, mc.start, mc.end, mco);
}
/// <summary> This function can be overridden if the original chain is needed</summary>
public virtual void Select(MonotoneChain mc, int start)
{
mc.GetLineSegment(start, selectedSegment);
Select(selectedSegment);
}