private Vector2?ExitIntersection()
{
if (!polygonBegin.HasValue || PEdge.Cross(QEdge) >= 0)
{
return(null);
}
SegmentSegmentIntersectionResult?result = SegmentSegmentIntersection(PPrev, P, QPrev, Q);
if (result.HasValue)
{
return(result.Value.position);
}
return(null);
}
private Vector2?EntranceIntersection()
{
if (PEdge.Cross(QEdge) <= 0)
{
return(null);
}
SegmentSegmentIntersectionResult?result = SegmentSegmentIntersection(PPrev, P, QPrev, Q);
if (result.HasValue && result.Value.at < 1 && result.Value.bt < 1)
{
return(result.Value.position);
}
return(null);
}