OpenSim-Test/OpenSim/Region/Environment/Modules/Terrain/PaintBrushes/SmoothSphere.cs

/*
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 *       derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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using OpenSim.Region.Environment.Interfaces;

namespace OpenSim.Region.Environment.Modules.Terrain.PaintBrushes
{
    public class SmoothSphere : ITerrainPaintableEffect
    {
        #region ITerrainPaintableEffect Members

        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
        {
            strength = TerrainUtil.MetersToSphericalStrength(strength);

            int x, y;
            double[,] tweak = new double[map.Width, map.Height];
            
            double n, l;
            double area = strength;
            double step = strength / 4.0;
            
            // compute delta map 
            for (x = 0; x < map.Width; x++)
            {
                for (y = 0; y < map.Height; y++)
                {
                    double z = TerrainUtil.SphericalFactor(x, y, rx, ry, strength);
                    
                    if (z > 0) // add in non-zero amount 
                    {
                        double average = 0.0;
                        int avgsteps = 0;
                        
                        for (n = 0.0 - area; n < area; n += step)
                        {
                            for (l = 0.0 - area; l < area; l += step)
                            {
                                avgsteps++;
                                average += TerrainUtil.GetBilinearInterpolate(x + n, y + l, map);
                            }
                        }
                        tweak[x, y] = average / avgsteps;
                    }
                }
            }
            // blend in map 
            for (x = 0; x < map.Width; x++)
            {
                for (y = 0; y < map.Height; y++)
                {
                    double z = TerrainUtil.SphericalFactor(x, y, rx, ry, strength);
                    
                    if (z > 0) // add in non-zero amount 
                    {
                        double da = z;
                        double a = (map[x, y] - tweak[x, y]) * da;
                        double newz = map[x, y] - (a * duration);

                        if (newz > 0.0)
                            map[x, y] = newz;
                    }
                }
            }
        }

        #endregion
    }
}