/*
* internal static bool DebugClose(Point target, Point source)
* {
* var a = new Point(307, 7);
* var b = new Point(540.6, 15);
*
* return (target - a).Length < 2 && (source - b).Length < 5 ||
* (source - a).Length < 2 && (target - b).Length<5;
* }
*/
internal VisibilityEdge AddEdge(Point source, Point target, Func <VisibilityVertex, VisibilityVertex, VisibilityEdge> edgeCreator)
{
VisibilityEdge edge;
var sourceV = FindVertex(source);
VisibilityVertex targetV = null;
if (sourceV != null)
{
targetV = FindVertex(target);
if (targetV != null && sourceV.TryGetEdge(targetV, out edge))
{
return(edge);
}
}
if (sourceV == null) //then targetV is also null
{
sourceV = AddVertex(source);
targetV = AddVertex(target);
}
else if (targetV == null)
{
targetV = AddVertex(target);
}
edge = edgeCreator(sourceV, targetV);
sourceV.OutEdges.Insert(edge);
targetV.AddInEdge(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.AddInEdge(edge);
return(edge);
}