internal void RemoveEdge(VisibilityVertex v1, VisibilityVertex v2)
{
VisibilityEdge edge;
if (!v1.TryGetEdge(v2, out edge))
{
return;
}
edge.Source.RemoveOutEdge(edge);
edge.Target.RemoveInEdge(edge);
}
static internal VisibilityEdge AddEdge(VisibilityVertex source, VisibilityVertex target)
{
VisibilityEdge visEdge;
if (source.TryGetEdge(target, out visEdge))
{
return(visEdge);
}
Debug.Assert(source != target, "Self-edges are not allowed");
var edge = new VisibilityEdge(source, target);
source.OutEdges.Insert(edge);
target.InEdges.Add(edge);
return(edge);
}
static internal VisibilityEdge AddEdge(VisibilityVertex source, VisibilityVertex target)
{
VisibilityEdge visEdge;
if (source.TryGetEdge(target, out visEdge))
{
return(visEdge);
}
if (source == target)
{
Debug.Assert(false, "Self-edges are not allowed");
throw new InvalidOperationException("Self-edges are not allowed");
}
var edge = new VisibilityEdge(source, target);
source.OutEdges.Insert(edge);
target.InEdges.Add(edge);
return(edge);
}
