public bool MoveForwardAndCheckForCrossing()
{
if (inside.MoveNext() & outside.MoveNext())
{
Edge <T> a = inside.Current;
Edge <T> b = outside.Current;
if (AreTwins(a, b))
{
Visited.Push(a);
return(false);
}
else
{
return(true);
}
}
else
{
throw new Exception("Error in Boundary: must not end.");
}
}
