private static List <int> PossibleNeighbors(int tile, Direction dir, List <int> tiles, RuleType rt)
{
var possible = new List <int>();
if (tile == -1)
{
if (rt == RuleType.Allowed)
{
possible.AddRange(tiles);
}
}
else
{
if (_TileRules.ContainsKey(tile))
{
foreach (var rule in _TileRules[tile])
{
//Skip rule if rule type doesn't match.
if (rule.Type != rt)
{
continue;
}
var neighborMatch = -1;
if (rule.Base == tile && rule.Direction == dir)
{
neighborMatch = rule.Neighbor;
}
else if (rule.Neighbor == tile && rule.Direction == TileRule.ReverseDirection(dir))
{
neighborMatch = rule.Base;
}
if (neighborMatch > -1 && tiles.Contains(neighborMatch))
{
possible.Add(neighborMatch);
}
}
}
}
return(possible);
}
public static void AddRule(TileRule rule)
{
if (rule == null)
{
return;
}
if (!_TileRules.ContainsKey(rule.Base))
{
_TileRules[rule.Base] = new List <TileRule>();
}
if (!_TileRules.ContainsKey(rule.Neighbor))
{
_TileRules[rule.Neighbor] = new List <TileRule>();
}
if (!_TileRules[rule.Base].Contains(rule))
{
_TileRules[rule.Base].Add(rule);
}
if (!_TileRules[rule.Neighbor].Contains(rule))
{
_TileRules[rule.Neighbor].Add(rule.Flip());
}
}
