// Mark the outside trapezoids surrounding the polygon
private void MarkOutside(Trapezoid t)
{
if (t.Top == _boundingBox.Top || t.Bottom == _boundingBox.Bottom)
{
t.TrimNeighbors();
}
}
// Recursively trim outside neighbors
public void TrimNeighbors()
{
if (Inside)
{
Inside = false;
if (UpperLeft != null)
{
UpperLeft.TrimNeighbors();
}
if (LowerLeft != null)
{
LowerLeft.TrimNeighbors();
}
if (UpperRight != null)
{
UpperRight.TrimNeighbors();
}
if (LowerRight != null)
{
LowerRight.TrimNeighbors();
}
}
}