/// <summary>
/// Creates a ClusterBoundaryPort for the cluster boundary, attaches it to the shape and all edges
/// </summary>
/// <param name="node"></param>
/// <returns>Shape obstacle for the node with simple port</returns>
static Shape CreateShapeWithClusterBoundaryPort(Node node) {
// Debug.Assert(ApproximateComparer.Close(node.BoundaryCurve.BoundingBox, node.BoundingBox), "node's curve doesn't fit its bounds!");
Debug.Assert(node is Cluster);
var shape = new RelativeShape(() => node.BoundaryCurve);
var port = new ClusterBoundaryPort(()=>node.BoundaryCurve, ()=>node.Center);
shape.Ports.Insert(port);
foreach (var e in node.InEdges)
FixPortAtTarget(shape, port, e);
foreach (var e in node.OutEdges)
FixPortAtSource(shape, port, e);
foreach (var e in node.SelfEdges) {
FixPortAtSource(shape, port, e);
FixPortAtTarget(shape, port, e);
}
#if DEBUG
shape.UserData = node.ToString();
#endif
return shape;
}