public IEnumerable<ValidRectanglePosition> ValidPositions()
{
foreach (List<PossibleRectanglePosition> many in positions.Values) {
foreach (var pair in many.SelectMany ((value, index) => many.Skip (index + 1),
(first, second) => new { first, second })) {
List<PossibleRectanglePosition> pos
= new PossibleRectanglePosition[] { pair.first, pair.second } .ToList ();
if (pos.Count == 2) {
for (int i = 0; i <= 1; ++i) {
int first = i % 2;
int second = (i + 1) % 2;
Edge edgeAB = pos [first].Edge;
Edge edgeCD = pos [second].Edge;
Node nodeA = pos [first].NodeA;
Node nodeB = pos [first].NodeB;
Node nodeC = pos [second].NodeA;
Node nodeD = pos [second].NodeB;
if (nodeB == nodeC || (nodeA-nodeB) == (nodeC-nodeD)) {
var valid = new ValidRectanglePosition {
EdgeAB = edgeAB,
EdgeCD = edgeCD,
NodeA = nodeA,
NodeB = nodeB,
NodeC = nodeC,
NodeD = nodeD,
Position = pos [first].Position,
IsVirtual = pos [first].IsVirtual || pos [second].IsVirtual
};
yield return valid;
}
}
}
}
}
}
public void AddEdge(Edge edge, Node nodeA, Node nodeB, bool isVirtual)
{
Vector3 edgeCenter = nodeA.CenterBetween (nodeB);
foreach (Direction direction in Direction.Values) {
if (direction.Axis != edge.Direction.Axis) {
Vector3 rectangleCenter = edgeCenter + direction * Node.Scale / 2;
PossibleRectanglePosition rectanglePosition = new PossibleRectanglePosition {
Edge = edge,
NodeA = nodeA,
NodeB = nodeB,
Position = rectangleCenter,
IsVirtual = isVirtual
};
positions.Add (rectangleCenter, rectanglePosition);
}
}
}