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

/*
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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 */

using System;
using OpenSim.Region.Environment.Interfaces;

namespace OpenSim.Region.Environment.Modules.Terrain.PaintBrushes
{
    public class RevertSphere : ITerrainPaintableEffect
    {
        ITerrainChannel m_revertmap;

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

        #region ITerrainPaintableEffect Members

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

            if (duration > 1.0)
                duration = 1.0;
            if (duration < 0)
                return;

            int x, y;
            for (x = 0; x < map.Width; x++)
            {
                // Skip everything unlikely to be affected
                if (Math.Abs(x - rx) > strength * 1.1)
                    continue;

                for (y = 0; y < map.Height; y++)
                {
                    // Skip everything unlikely to be affected
                    if (Math.Abs(y - ry) > strength * 1.1)
                        continue;

                    // Calculate a sphere and add it to the heighmap
                    double z = strength;
                    z *= z;
                    z -= ((x - rx) * (x - rx)) + ((y - ry) * (y - ry));

                    if (z > 0.0)
                    {
                        z *= duration;
                        map[x, y] += (map[x, y] * (1.0 - z)) + (m_revertmap[x, y] * z);
                    }
                }
            }
        }

        #endregion
    }
}