OpenSim-Test/OpenSim/Region/CoreModules/World/Terrain/PaintBrushes/RevertSphere.cs

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using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;

namespace OpenSim.Region.CoreModules.World.Terrain.PaintBrushes
{
    public class RevertSphere : ITerrainPaintableEffect
    {
        private readonly ITerrainChannel m_revertmap;

        public RevertSphere(ITerrainChannel revertmap)
        {
            m_revertmap = revertmap;
        }

        #region ITerrainPaintableEffect Members

        public void PaintEffect(ITerrainChannel map, bool[,] mask, float rx, float ry, float rz,
            float size, float strength, int startX, int endX, int startY, int endY)
        {
             if (strength < 0)
                return;

            if (strength > 1.0f)
                strength = 1.0f;

            int x, y;
            float distancefactor;
            float dx2;

            for (x = startX; x <= endX; x++)
            {
                dx2 = (x - rx) * (x - rx);
                for (y = startY; y <= endY; y++)
                {
                    if (!mask[x, y])
                        continue;

                    // Calculate a sphere and add it to the heighmap
                    distancefactor = (dx2 + (y - ry) * (y - ry)) / size;
                    if (distancefactor > 1.0f)
                        continue;

                    distancefactor = strength * (1.0f - distancefactor);
                    map[x, y] = (map[x, y] * (1.0f - distancefactor)) + (m_revertmap[x, y] * distancefactor);
                }
            }
        }

        #endregion
    }
}