/// <summary>
/// Gets the neighbour positions for the given position.
/// </summary>
/// <param name="x"> The x-coordinate. </param>
/// <param name="y"> The y-coordinate. </param>
/// <param name="map"> The map to get positions for. </param>
/// <param name="neighbourhood"> The type of neighbourhood to look at. </param>
/// <returns> A list of the coordinates for the neighbour positions. </returns>
public static List <Position> GetNeighbourPositions(int x, int y, Enums.HeightLevel[,] map, RuleEnums.Neighbourhood neighbourhood = RuleEnums.Neighbourhood.Moore)
{
var list = new List <Position>();
var moves = new[] { -1, 0, 1 };
var sizeX = map.GetLength(0);
var sizeY = map.GetLength(1);
var neumann = neighbourhood == RuleEnums.Neighbourhood.VonNeumann ||
neighbourhood == RuleEnums.Neighbourhood.VonNeumannExtended;
if (neighbourhood == RuleEnums.Neighbourhood.MooreExtended ||
neighbourhood == RuleEnums.Neighbourhood.VonNeumannExtended)
{
moves = new[] { -2, -1, 0, 1, 2 }
}
;
foreach (var moveX in moves)
{
foreach (var moveY in moves)
{
if (moveX == 0 && moveY == 0)
{
continue;
}
if (neumann && (moveX != 0 && moveY != 0))
{
continue;
}
var posToCheck = new Position(x + moveX, y + moveY);
if (!WithinMapBounds(posToCheck, sizeX, sizeY))
{
continue;
}
list.Add(posToCheck);
}
}
return(list);
}
/// <summary>
/// Gets the number of different neighbours surrounding the given position.
/// </summary>
/// <param name="x"> The x-coordinate to check neighbours for. </param>
/// <param name="y"> The y-coordinate to check neighbours for. </param>
/// <param name="map"> The map. </param>
/// <param name="neighbourhood"> The type of neighbourhood to look at. </param>
/// <returns> A dictionary containing the neighbours and the count of them. </returns>
public static Dictionary <Enums.HeightLevel, int> GetNeighbours(int x, int y, Enums.HeightLevel[,] map, RuleEnums.Neighbourhood neighbourhood = RuleEnums.Neighbourhood.Moore)
{
var neighbours = new Dictionary <Enums.HeightLevel, int>();
var moves = new[] { -1, 0, 1 };
var sizeX = map.GetLength(0);
var sizeY = map.GetLength(1);
var neumann = neighbourhood == RuleEnums.Neighbourhood.VonNeumann ||
neighbourhood == RuleEnums.Neighbourhood.VonNeumannExtended;
if (neighbourhood == RuleEnums.Neighbourhood.MooreExtended ||
neighbourhood == RuleEnums.Neighbourhood.VonNeumannExtended)
{
moves = new[] { -2, -1, 0, 1, 2 }
}
;
// Ensure that all keys are in the dictionary
foreach (var heightlevel in Enum.GetValues(typeof(Enums.HeightLevel)))
{
neighbours[(Enums.HeightLevel)heightlevel] = 0;
}
foreach (var moveX in moves)
{
foreach (var moveY in moves)
{
if (moveX == 0 && moveY == 0)
{
continue;
}
if (neumann && (moveX != 0 && moveY != 0))
{
continue;
}
var posToCheck = new Position(x + moveX, y + moveY);
if (!WithinMapBounds(posToCheck, sizeX, sizeY))
{
continue;
}
neighbours[map[posToCheck.Item1, posToCheck.Item2]]++;
}
}
return(neighbours);
}
