public void PrepareSegments()
{
Segments.ForEach(s => s.IsClipped = s.GetIsClipped(TopLeft, BottomRight) && !s.IsOutline);
if (_clipping)
{
Segments.RemoveAll(s => s.IsClipped);
}
DoMergeCollinearSegments();
SplitSegmentsThatOverlap();
EndPoints.AddRange(Segments.Select(vs => vs.Start));
EndPoints.AddRange(Segments.Select(vs => vs.End));
DebugDrawSegments();
}