private static float GetValue( GasGiantModel model, float x, float y )
{
float n0 = s_Noise.GetNoise( 2.0098f + x * model.Pass0XNoiseScale, 5.0973502375f + y * model.Pass0YNoiseScale, 0 );
float res = s_Noise.GetNoise( 2.0098f + n0 * model.Pass1XNoiseMultiplier + x * model.Pass1XNoiseScale, n0 * n0 * model.Pass1YNoiseMultiplier + y * model.Pass1YNoiseScale, 0 );
res = ( res + 1.0f ) / 2.0f;
return res;
}
public static Bitmap Generate( GasGiantModel model )
{
if ( model == null )
{
throw new ArgumentNullException( "model" );
}
Bitmap bmp = new Bitmap( model.Width, model.Height, PixelFormat.Format24bppRgb );
for ( int y = 0; y < model.Height; ++y )
{
float fY = ( float )y / ( model.Height - 1 );
for ( int x = 0; x < model.Width; ++x )
{
float fX = ( float )x / ( model.Width - 1 );
float wrapfX = fX - 1;
float invfX = 1 - fX;
float v0 = GetValue( model, fX, fY ) * invfX;
float v1 = GetValue( model, wrapfX, fY ) * fX;
float v = ( v0 + v1 );
bmp.SetPixel( x, y, MapValueToColour( model, v ) );
}
}
return bmp;
}
private static Color MapValueToColour( GasGiantModel model, float value )
{
float cF = value * model.BandColours.Length;
int c0In = Math.Min( ( int )cF, model.BandColours.Length - 1 );
Color c0 = model.BandColours[ c0In ];
Color c1 = model.BandColours[ Math.Min( c0In + 1, model.BandColours.Length - 1 ) ];
float t = ( cF - c0In );
float r = c0.R + ( c1.R - c0.R ) * t;
float g = c0.G + ( c1.G - c0.G ) * t;
float b = c0.B + ( c1.B - c0.B ) * t;
return Color.FromArgb( ( int )r, ( int )g, ( int )b );
}