opensim/OpenSim/Region/Environment/Modules/World/Terrain/FloodBrushes/SmoothArea.cs

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using OpenSim.Region.Environment.Interfaces;

namespace OpenSim.Region.Environment.Modules.World.Terrain.FloodBrushes
{
    public class SmoothArea : ITerrainFloodEffect
    {
        #region ITerrainFloodEffect Members

        public void FloodEffect(ITerrainChannel map, bool[,] fillArea, double strength)
        {
            double area = strength;
            double step = strength / 4.0;

            double[,] manipulate = new double[map.Width,map.Height];
            int x, y;
            for (x = 0; x < map.Width; x++)
            {
                for (y = 0; y < map.Height; y++)
                {
                    if (!fillArea[x, y])
                        continue;

                    double average = 0.0;
                    int avgsteps = 0;

                    double n;
                    for (n = 0.0 - area; n < area; n += step)
                    {
                        double l;
                        for (l = 0.0 - area; l < area; l += step)
                        {
                            avgsteps++;
                            average += GetBilinearInterpolate(x + n, y + l, map);
                        }
                    }

                    manipulate[x, y] = average / avgsteps;
                }
            }
            for (x = 0; x < map.Width; x++)
            {
                for (y = 0; y < map.Height; y++)
                {
                    if (!fillArea[x, y])
                        continue;

                    map[x, y] = manipulate[x, y];
                }
            }
        }

        #endregion

        private static double GetBilinearInterpolate(double x, double y, ITerrainChannel map)
        {
            int w = map.Width;
            int h = map.Height;

            if (x > w - 2.0)
                x = w - 2.0;
            if (y > h - 2.0)
                y = h - 2.0;
            if (x < 0.0)
                x = 0.0;
            if (y < 0.0)
                y = 0.0;

            const int stepSize = 1;
            double h00 = map[(int) x, (int) y];
            double h10 = map[(int) x + stepSize, (int) y];
            double h01 = map[(int) x, (int) y + stepSize];
            double h11 = map[(int) x + stepSize, (int) y + stepSize];
            double h1 = h00;
            double h2 = h10;
            double h3 = h01;
            double h4 = h11;
            double a00 = h1;
            double a10 = h2 - h1;
            double a01 = h3 - h1;
            double a11 = h1 - h2 - h3 + h4;
            double partialx = x - (int) x;
            double partialz = y - (int) y;
            double hi = a00 + (a10 * partialx) + (a01 * partialz) + (a11 * partialx * partialz);
            return hi;
        }
    }
}