/// <summary>
/// Returns a pair of connectors at distinct positions on tile which match glue1 and glue2 in GlueRelation.
/// If no such pair exist, then both returned connectors are null.
/// Method is used for insertion of the "tile" between existing connectors with "glue1" and "glue2"
/// </summary>
public Tuple <ConnectorOnTile, ConnectorOnTile> MatchingConectors(Tile tile, Glue glue1, Glue glue2)
{
ConnectorOnTile conn2 = null;
var conn1 = tile.Connectors.FirstOrDefault(
connector1 => tile.Vertices.ContainsPoint(connector1.Positions[0]) &&
GlueRelation.MatchAsymmetric(glue1, connector1.Glue) &&
(conn2 = tile.Connectors.FirstOrDefault(
connector2 => !connector1.Positions[0].MyEquals(connector2.Positions[0]) &&
tile.Vertices.ContainsPoint(connector2.Positions[0]) &&
GlueRelation.MatchAsymmetric(glue2, connector2.Glue)))
!= null);
return(Tuple.Create(conn1, conn2));
}
