private int GetSeed(NoiseConfiguration config)
{
if (Seeds.TryGetValue(config.Seed, out int value))
{
return(value);
}
else
{
Seeds.Add(config.Seed, (int)Math.Sqrt(Math.Abs(13 * config.Seed * config.Seed)));
return(GetSeed(config));
}
}
public float[][] GetNoiseValues(NoiseConfiguration config, double zoom, Area area, double maxDistanceInMeters, int imageWidth, int imageHeight)
{
if (imageWidth == 0 || imageHeight == 0)
{
return(null);
}
//float factor = Math.Max(imageWidth / 256f, imageHeight / 256f);
float factor = 1;
int calcWidth = (int)(imageWidth / factor);
int calcHeight = (int)(imageHeight / factor);
float[][] result = new float[calcWidth][];
for (int i = 0; i < result.Length; i++)
{
result[i] = new float[calcHeight];
}
FastNoise noiseGenerator = new FastNoise(GetSeed(config));
double xMovementPerPixel = (area.XEnd - area.XStart) / calcWidth;
double yMovementPerPixel = (area.YEnd - area.YStart) / calcHeight;
//Optimisation possibility: we don't have to calculate haversine for each pixel.
//Calculate the rectangle that needs to be calculated and set all the other cells to
//Color.FromArgb(0, 0, 0, 0)
//i.e. start in the middle and move to the right and left. Stop calculating when the calculationborder is reached
bool allPointsIncluded = maxDistanceInMeters == 0 || WSG84Math.GetDistanceInMeters(area.Center, area.TopLeftCorner) < maxDistanceInMeters;
for (int x = 0; x < calcWidth; x++)
{
for (int y = 0; y < calcHeight; y++)
{
double pixelX = area.XStart + xMovementPerPixel * x;
double pixelY = area.YStart + yMovementPerPixel * y;
result[x][y] = 0;
if (allPointsIncluded || WSG84Math.GetDistanceInMeters(pixelY, pixelX, area.YCenter, area.XCenter) < maxDistanceInMeters)
{
result[x][y] = GetValue(noiseGenerator, (NoiseType)config.Type, pixelX * zoom, pixelY * zoom);
}
}
}
return(result);
}
public float GetNoiseValue(NoiseConfiguration config, double zoom, double latitude, double longitude)
{
FastNoise noiseGenerator = new FastNoise(GetSeed(config));
return(GetValue(noiseGenerator, (NoiseType)config.Type, longitude * zoom, latitude * zoom));
}
