/// <summary>
/// Fills a region with a given tile.
/// </summary>
/// <param name="map">WorldMap to use</param>
/// <param name="X">X coordinate of starting point</param>
/// <param name="Y">Y coordinate of starting point</param>
/// <param name="From">Tile to replace</param>
/// <param name="To">Tile to replace with</param>
/// <returns>Amount of tiles filled</returns>
static List <Point> FloodFill(WorldMap map, int X, int Y, WorldMap.TileType From, WorldMap.TileType To)
{
List <Point> points = new List <Point>();
if (X < 0 || Y < 0 || X >= map.Width || Y >= map.Height)
{
return(points);
}
if (map.TileData[X, Y] != From)
{
return(points);
}
map.TileData[X, Y] = To;
points.Add(new Point(X, Y));
Queue <Point> Q = new Queue <Point>();
Q.Enqueue(new Point(X, Y));
while (Q.Count() > 0)
{
Point n = Q.Dequeue();
X = n.X;
Y = n.Y;
if (X + 1 < map.Width && Y < map.Height && map.TileData[X + 1, Y] == From)
{
map.TileData[X + 1, Y] = To;
points.Add(new Point(X + 1, Y));
Q.Enqueue(new Point(X + 1, Y));
}
if (X >= 0 && Y + 1 < map.Height && map.TileData[X, Y + 1] == From)
{
map.TileData[X, Y + 1] = To;
points.Add(new Point(X, Y + 1));
Q.Enqueue(new Point(X, Y + 1));
}
if (X - 1 >= 0 && Y >= 0 && map.TileData[X - 1, Y] == From)
{
map.TileData[X - 1, Y] = To;
points.Add(new Point(X - 1, Y));
Q.Enqueue(new Point(X - 1, Y));
}
if (X < map.Width && Y - 1 >= 0 && map.TileData[X, Y - 1] == From)
{
map.TileData[X, Y - 1] = To;
points.Add(new Point(X, Y - 1));
Q.Enqueue(new Point(X, Y - 1));
}
}
return(points);
/*
* FloodFill(map, X + 1, Y + 1, From, To);
* FloodFill(map, X + 1, Y - 1, From, To);
* FloodFill(map, X - 1, Y - 1, From, To);
* FloodFill(map, X - 1, Y + 1, From, To);
* //*/
}
/// <summary>
/// Simple search and replace.
/// </summary>
/// <param name="map">Working map</param>
/// <param name="From">Tile to replace</param>
/// <param name="To">Replacement tile</param>
public static void Replace(WorldMap map, WorldMap.TileType From, WorldMap.TileType To)
{
for (int x = 0; x < map.Width; x++)
{
for (int y = 0; y < map.Height; y++)
{
if (map.TileData[x, y] == From)
{
map.TileData[x, y] = To;
}
}
}
}
/// <summary>
/// Check for presence of a specific tile type in a specific direction (orthogonal)
/// </summary>
/// <param name="map">Working map</param>
/// <param name="X">Starting point</param>
/// <param name="Y">Starting point</param>
/// <param name="Direction">Direction 0,1,2,3 - West is 0 and then clockwise</param>
/// <param name="distance">Maximum distance to look</param>
/// <param name="Tile"></param>
/// <returns>distance or 9999 if not found</returns>
public static int LookRayTile(WorldMap map, int X, int Y, int Direction, int distance, WorldMap.TileType Tile)
{
int D = 9999;
int dX = 0;
int dY = 0;
if (Direction == DIR_E)
{
dX = 1;
}
if (Direction == DIR_W)
{
dX = -1;
}
if (Direction == DIR_N)
{
dY = -1;
}
if (Direction == DIR_S)
{
dY = 1;
}
for (int i = 0; i < distance; i++)
{
X += dX;
Y += dY;
if (X < 0 || X >= map.Width || Y < 0 || Y > map.Height)
{
return(D);
}
WorldMap.TileType Target = map.TileData[X, Y];
if (Target == Tile)
{
return(i);
}
}
return(D);
}
/// <summary>
/// Places mountain tiles
/// </summary>
/// <param name="map">Working map</param>
/// <param name="amount">Amount to place - currently unused</param>
public static void DoMountains(WorldMap map, int amount)
{
int cutoff = 200;
int cutoff2 = 160;
int cutoff3 = 128;
float MountainSizeDivisor = 1f / 32f;
float MountainSpreadDivisor = 1f / 128f;
float MountainFrequencyDivisor = 1f / 512f;
float Noise1 = 1f / 4f;
float Noise2 = 1f / 6f;
for (int x = 1; x < map.Width - 1; x++)
{
for (int y = 1; y < map.Height - 1; y++)
{
int H = (int)Simplex.CalcPixel2D(x, y, MountainSizeDivisor);
int M = (int)Simplex.CalcPixel2D(x, y, MountainFrequencyDivisor);
int S = (int)Simplex.CalcPixel2D(x, y, MountainSpreadDivisor);
int N1 = (int)Simplex.CalcPixel2D(x, y, Noise1);
int N2 = (int)Simplex.CalcPixel2D(x, y, Noise2);
if (H > cutoff && M > cutoff2 && S > cutoff3 && N1 > cutoff3 && N2 > cutoff3)
{
WorldMap.TileType Target = map.TileData[x, y];
if (Target != WorldMap.TileType.Ocean && Target != WorldMap.TileType.River)
{
map.TileData[x, y] = WorldMap.TileType.Mountain;
//greatly raise actual mountain tiles
map.ElevationData[x, y] = (float)Math.Pow((MathHelper.Clamp(map.ElevationData[x, y], 0f, 999f)), 1f / 10f);
//raise tiles around them too
if (map.TileData[x - 1, y] != WorldMap.TileType.Mountain)
{
map.ElevationData[x - 1, y] = (float)Math.Pow((MathHelper.Clamp(map.ElevationData[x - 1, y], 0f, 999f)), 1f / 3f);
}
if (map.TileData[x + 1, y] != WorldMap.TileType.Mountain)
{
map.ElevationData[x + 1, y] = (float)Math.Pow((MathHelper.Clamp(map.ElevationData[x + 1, y], 0f, 999f)), 1f / 3f);
}
if (map.TileData[x, y - 1] != WorldMap.TileType.Mountain)
{
map.ElevationData[x, y - 1] = (float)Math.Pow((MathHelper.Clamp(map.ElevationData[x, y - 1], 0f, 999f)), 1f / 3f);
}
if (map.TileData[x, y + 1] != WorldMap.TileType.Mountain)
{
map.ElevationData[x, y + 1] = (float)Math.Pow((MathHelper.Clamp(map.ElevationData[x, y + 1], 0f, 999f)), 1f / 3f);
}
}
}
}
}
/*/
* for (int i=0;i<amount;i++)
* {
* int X = RNG.NextInt(0, map.Width);
* int Y = RNG.NextInt(0, map.Height);
* WorldMap.TileType Target = map.TileData[X, Y];
* if (Target != WorldMap.TileType.Ocean && Target != WorldMap.TileType.River)
* map.TileData[X, Y] = WorldMap.TileType.Mountain;
* }
* //*/
}
/// <summary>
/// Populates a float 2D array with distance values on a given map from given tile type
/// </summary>
/// <param name="map">Working map</param>
/// <param name="DistanceField">Initial 2D distance field</param>
/// <param name="Target">Tile to calculate distances from</param>
/// <returns>Computed 2D array distance field</returns>
public static float[,] DoDistanceField(WorldMap map, float[,] DistanceField, WorldMap.TileType Target)
{
//pass 1: set all to something stupid like 9999 except target
float MAX = 9999f;
float Highest = 0f;
float[] neighbourhood = new float[8];
for (int x = 0; x < map.Width; x++)
{
for (int y = 0; y < map.Height; y++)
{
if (map.TileData[x, y] == Target)
{
DistanceField[x, y] = 0;
}
else
{
DistanceField[x, y] = MAX;
}
}
}
//pass 2 & 3: pathfind
for (int x = 1; x < map.Width - 1; x++)
{
for (int y = 1; y < map.Height - 1; y++)
{
//iterate over 8 neighbours, pick the smallest, add 1
neighbourhood[0] = DistanceField[x - 1, y - 1];
neighbourhood[1] = DistanceField[x, y - 1];
neighbourhood[2] = DistanceField[x + 1, y - 1];
neighbourhood[3] = DistanceField[x - 1, y];
neighbourhood[4] = DistanceField[x + 1, y];
neighbourhood[5] = DistanceField[x - 1, y + 1];
neighbourhood[6] = DistanceField[x, y + 1];
neighbourhood[7] = DistanceField[x + 1, y + 1];
float smallest = neighbourhood.Min();
//do not make any changes if no neighbours are lower and not the default value
if (smallest < MAX && smallest < DistanceField[x, y])
{
DistanceField[x, y] = smallest + 1;
}
}
}
//go from the other direction now
for (int x = map.Width - 2; x > 0; x--)
{
for (int y = map.Height - 2; y > 0; y--)
{
//iterate over 8 neighbours, pick the smallest, add 1
neighbourhood[0] = DistanceField[x - 1, y - 1];
neighbourhood[1] = DistanceField[x, y - 1];
neighbourhood[2] = DistanceField[x + 1, y - 1];
neighbourhood[3] = DistanceField[x - 1, y];
neighbourhood[4] = DistanceField[x + 1, y];
neighbourhood[5] = DistanceField[x - 1, y + 1];
neighbourhood[6] = DistanceField[x, y + 1];
neighbourhood[7] = DistanceField[x + 1, y + 1];
float smallest = neighbourhood.Min();
//do not make any changes if no neighbours are lower and not the default value
if (smallest < MAX && smallest < DistanceField[x, y])
{
//add 1 to the distance - regardless if diagonal or straight
DistanceField[x, y] = smallest + 1;
//find the furthest value - use it for scaling down to highest being 1.0f and lowest being 0.0f
if (Highest < smallest + 1)
{
Highest = smallest + 1;
}
}
}
}
//pass 4: normalisation
if (Highest != 0)
{
for (int x = 1; x < map.Width - 1; x++)
{
for (int y = 1; y < map.Height - 1; y++)
{
DistanceField[x, y] /= Highest;
}
}
}
return(DistanceField);
}