public VWVertex Remove()
{
VWVertex tmpPrev = Prev;
var tmpNext = Next;
VWVertex result = null;
if (Prev != null)
{
Prev.Next = tmpNext;
Prev.UpdateArea();
result = Prev;
}
if (Next != null)
{
Next.Prev = tmpPrev;
Next.UpdateArea();
if (result == null)
{
result = Next;
}
}
_isLive = false;
return(result);
}