/// <summary>
/// Fills the heightmap with values generated from given function.
/// </summary>
public void Generate(HeightFunc func)
{
int i = 0;
for (int y = 0; y < Height; y++)
{
for (int x = 0; x < Width; x++)
{
data[i++] = calculate(func, x, y);
}
}
}
/// <summary>
/// Calculates single height value for specified function and coordinates.
/// </summary>
float calculate(HeightFunc func, int x, int y)
{
float xu = x - Width / 2.0f;
float yu = y - Height / 2.0f;
switch (func)
{
case HeightFunc.EggBox:
{
double r = 4.0f * Math.Sqrt((double)(xu * xu + yu * yu)) / scale;
double z = Math.Exp(-r * 2) * (Math.Cos(0.2f * xu) + Math.Cos(0.2f * yu));
float o = (float)(0.32f + 0.25f * z);
return(o);
}
case HeightFunc.MoreSine:
{
double xf = 0.3f * xu / scale;
double yf = 12.0f * yu / scale;
double z = Math.Sin(xf * xf + yf) * Math.Sin(xf + yf * yf);
float o = (float)(0.25f + 0.25f * z);
return(o);
}
case HeightFunc.JustExp:
{
float xf = 6 * xu / scale;
float yf = 6 * yu / scale;
float z = xf * xf + yf * yf;
float o = (float)(0.3f * z * Math.Cos(xf * yf));
return(o);
}
default:
throw new ArgumentException("Unexpected height function value: " + func.ToString());
}
}
/// <summary>
/// Calculates single height value for specified function and coordinates.
/// </summary>
float calculate(HeightFunc func, int x, int y)
{
float xu = x - Width / 2.0f;
float yu = y - Height / 2.0f;
switch (func)
{
case HeightFunc.EggBox:
{
double r = 4.0f * Math.Sqrt((double)(xu * xu + yu * yu)) / scale;
double z = Math.Exp(-r * 2) * (Math.Cos(0.2f * xu) + Math.Cos(0.2f * yu));
float o = (float)(0.32f + 0.25f * z);
return o;
}
case HeightFunc.MoreSine:
{
double xf = 0.3f * xu / scale;
double yf = 12.0f * yu / scale;
double z = Math.Sin(xf * xf + yf) * Math.Sin(xf + yf * yf);
float o = (float)(0.25f + 0.25f * z);
return o;
}
case HeightFunc.JustExp:
{
float xf = 6 * xu / scale;
float yf = 6 * yu / scale;
float z = xf * xf + yf * yf;
float o = (float)(0.3f * z * Math.Cos(xf * yf));
return o;
}
default:
throw new ArgumentException("Unexpected height function value: " + func.ToString());
}
}
/// <summary>
/// Fills the heightmap with values generated from given function.
/// </summary>
public void Generate(HeightFunc func)
{
int i = 0;
for (int y = 0; y < Height; y++)
for (int x = 0; x < Width; x++)
data[i++] = calculate(func, x, y);
}
