private double[,] MockImageEffect(HeightMap h, double brightness)
{
var result = h.Clone();
h.ForEach((r, c) => { result[r, c] = result[r, c] + brightness; });
return(result.Data);
}
// TODO: Test that the mean error of the blur result,
// compared to "real" (convolution of gaussian function)
// gaussian blur, is within a reasonable threshold.
private HeightMap MockImageEffect(HeightMap heightMap, double[,] kernel)
{
var resultA = new HeightMap(heightMap.Height, heightMap.Width);
var resultB = new HeightMap(heightMap.Height, heightMap.Width);
int half = 5 / 2;
heightMap.ForEach((r, c) => {
var sum = 0d;
for (var i = 0; i < 5; i++)
{
var x = MathHelper.Clamp(c + i - half, 0, 4);
sum += heightMap[0, x] * kernel[i, 0];
}
resultA[r, c] = sum;
});
resultA.ForEach((r, c) => {
var sum = 0d;
for (var i = 0; i < 5; i++)
{
sum += resultA[0, c] * kernel[i, 0];
}
resultB[r, c] = sum;
});
return(resultB);
}
private double[,] MockImageEffect(HeightMap h)
{
var result = h.Clone();
h.ForEach((r, c) => { result[r, c] = 1 - result[r, c]; });
return(result.Data);
}
private double[,] MockImageEffect(HeightMap h, double intensity)
{
var result = h.Clone();
h.ForEach((r, c) => { result[r, c] = result[r, c] * intensity; });
return(result.Data);
}
private double[,] MockImageEffect(HeightMap h, double gamma)
{
var result = h.Clone();
double gammaCorrection = 1 / gamma;
h.ForEach((r, c) => { result[r, c] = Math.Pow(result[r, c], gammaCorrection); });
return(result.Data);
}
private HeightMap CalculateGaussianConvolution(HeightMap source, double[,] kernel,
Direction direction)
{
var result = new HeightMap(source.Height, source.Width);
source.ForEach((r, c) => {
result[r, c] = CalculatePoint(source, r, c, kernel, direction);
});
return(result);
}
private HeightMap MockImageEffect(HeightMap h)
{
var result = h.Clone();
h.ForEach((r, c) => {
result[r, c] += 0.1d;
});
return(result);
}
/// <summary>
/// Generate a white noise <see cref="HeightMap"/>
/// </summary>
public override HeightMap Generate()
{
var map = new HeightMap(Dimensions);
var rand = Seed.HasValue ? new Random(Seed.Value) : new Random();
map.ForEach((r, c) => {
map[r, c] = rand.NextDouble();
});
return(map);
}
/// <summary>
/// Generate a simplex noise <see cref="HeightMap"/>
/// </summary>
/// <returns></returns>
public override HeightMap Generate()
{
var map = new HeightMap(Dimensions);
var noise = new OpenSimplexNoise(Seed ?? DateTime.Now.Ticks);
map.ForEach((r, c) => {
map[r, c] = (noise.Generate(c * Scale.Width, r * Scale.Height) + 1) / 2;
});
return(map);
}
public override HeightMap Generate()
{
var map = new HeightMap(Dimensions);
generator = new OpenSimplexNoise(Seed ?? DateTime.Now.Ticks);
map.ForEach((r, c) => {
map[r, c] = SumOctave(c, r);
});
return(map);
}
private double[,] MockImageEffect(HeightMap h, double brightness)
{
const double High = 259d;
const double Low = 255d;
double F = (High * (brightness + Low)) / (Low * (High - brightness));
var result = h.Clone();
h.ForEach((r, c) => { result[r, c] = F * (result[r, c] - 0.5d) + 0.5d; });
return(result.Data);
}