/// <summary>
/// Removes the edge from->unknown and replaces it with the edge from->to.
/// 0->1->2:ReplaceEdgeFrom(0, 2):0->2 without resetting the last customer property.
/// </summary>
/// <param name="from"></param>
/// <param name="to"></param>
public void ReplaceEdgeFrom(int from, int to)
{
if (to == 0 && from == 0)
{ // clear all elements from the route.
_route.Clear();
}
else if (to == 0)
{
_route.ReplaceEdgeFrom(from, -1);
}
else if (from == 0)
{ // TODO: replace the from customer.
_route.ReplaceFirst(to);
}
else
{
_route.ReplaceEdgeFrom(from, to);
}
}