public static IEnumerable <Vector2D> Positions <T>(this IPersistentGrid <T> grid)
{
foreach (var x in Enumerable.Range(0, grid.Width))
{
foreach (var y in Enumerable.Range(0, grid.Height))
{
yield return(new Vector2D(x, y));
}
}
}
public static Vector2D FindPosition <T>(this IPersistentGrid <T> grid, Func <T, bool> predicate)
{
foreach (var position in grid.Positions())
{
if (predicate(grid[position]))
{
return(position);
}
}
return(null);
}
public static IPersistentGrid <T> Update <T>(this IPersistentGrid <T> grid, Vector2D position, Func <T, T> updater)
{
return(grid.Set(position, updater(grid[position])));
}
public static IPersistentGrid <U> Map <T, U>(this IPersistentGrid <T> grid, Func <T, U> mapper)
{
return(new PersistentGrid <U>(grid.Width, grid.Height, p => mapper(grid[p])));
}
public static bool IsValidPosition <T>(this IPersistentGrid <T> grid, Vector2D position)
{
return(0 <= position.X && position.X < grid.Width && 0 <= position.Y && position.Y < grid.Height);
}
