LowerSphere.cs

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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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using System;
using OpenSim.Region.Framework.Interfaces;

namespace OpenSim.Region.CoreModules.World.Terrain.PaintBrushes
{
    public class LowerSphere : ITerrainPaintableEffect
    {
        #region ITerrainPaintableEffect Members

        public void PaintEffect(ITerrainChannel map, bool[,] mask, double rx, double ry, double rz,
            double strength, double duration, int startX, int endX, int startY, int endY)
        {
            int s = (int) (Math.Pow(2, strength) + 0.5);

            int x, y;

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

                    // Calculate a cos-sphere and add it to the heighmap
                    double r = Math.Sqrt((x-rx) * (x-rx) + ((y-ry) * (y-ry)));
                    double z = Math.Cos(r * Math.PI / (s * 2));
                    if (z > 0.0)
                    {
                        double newz = map[x, y] - z * duration;
                        if (newz < 0.0)
                            map[x, y] = 0.0;
                        else
                            map[x, y] = newz;
                    } 
                }
            }

        }
        #endregion
    }
}