//<summary> return the number of hidden tiles shared by these tiles
public int NumberOfSharedHiddenTiles(SolverTile tile)
{
// if the locations are too far apart they can't share any of the same squares
if (Math.Abs(tile.x - this.x) > 2 || Math.Abs(tile.y - this.y) > 2)
{
return(0);
}
int count = 0;
foreach (SolverTile tile1 in this.GetAdjacentTiles())
{
if (!tile1.IsHidden())
{
continue;
}
foreach (SolverTile tile2 in tile.GetAdjacentTiles())
{
if (!tile2.IsHidden())
{
continue;
}
if (tile1.IsEqual(tile2)) // if they share a tile then return true
{
count++;
}
}
}
// no shared tile found
return(count);
}
// returns all the indices adjacent to this index
public List <SolverTile> GetAdjacentTiles(SolverTile tile)
{
// have we already calculated the adjacent tiles
List <SolverTile> adjTiles = tile.GetAdjacentTiles();
if (adjTiles != null)
{
return(adjTiles);
}
adjTiles = new List <SolverTile>();
int first_row = Math.Max(0, tile.y - 1);
int last_row = Math.Min(description.height - 1, tile.y + 1);
int first_col = Math.Max(0, tile.x - 1);
int last_col = Math.Min(description.width - 1, tile.x + 1);
for (int r = first_row; r <= last_row; r++)
{
for (int c = first_col; c <= last_col; c++)
{
if (r != tile.y || c != tile.x)
{
adjTiles.Add(tiles[c, r]);
}
}
}
// remember them for next time
tile.SetAdjacentTiles(adjTiles);
return(adjTiles);
}
