OpenSim-Test/OpenSim/Region/CoreModules/World/Terrain/PaintBrushes/OlsenSphere.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.
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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;
using OpenSim.Region.Framework.Scenes;

namespace OpenSim.Region.CoreModules.World.Terrain.PaintBrushes
{
    /// <summary>
    /// Speed-Optimised Hybrid Erosion Brush
    ///
    /// As per Jacob Olsen's Paper
    /// http://www.oddlabs.com/download/terrain_generation.pdf
    /// </summary>
    public class OlsenSphere : ITerrainPaintableEffect
    {
        private const double nConst = 1024.0;
        private const NeighbourSystem type = NeighbourSystem.Moore;

        #region Supporting Functions

        private static int[] Neighbours(NeighbourSystem neighbourType, int index)
        {
            int[] coord = new int[2];

            index++;

            switch (neighbourType)
            {
                case NeighbourSystem.Moore:
                    switch (index)
                    {
                        case 1:
                            coord[0] = -1;
                            coord[1] = -1;
                            break;

                        case 2:
                            coord[0] = -0;
                            coord[1] = -1;
                            break;

                        case 3:
                            coord[0] = +1;
                            coord[1] = -1;
                            break;

                        case 4:
                            coord[0] = -1;
                            coord[1] = -0;
                            break;

                        case 5:
                            coord[0] = -0;
                            coord[1] = -0;
                            break;

                        case 6:
                            coord[0] = +1;
                            coord[1] = -0;
                            break;

                        case 7:
                            coord[0] = -1;
                            coord[1] = +1;
                            break;

                        case 8:
                            coord[0] = -0;
                            coord[1] = +1;
                            break;

                        case 9:
                            coord[0] = +1;
                            coord[1] = +1;
                            break;

                        default:
                            break;
                    }
                    break;

                case NeighbourSystem.VonNeumann:
                    switch (index)
                    {
                        case 1:
                            coord[0] = 0;
                            coord[1] = -1;
                            break;

                        case 2:
                            coord[0] = -1;
                            coord[1] = 0;
                            break;

                        case 3:
                            coord[0] = +1;
                            coord[1] = 0;
                            break;

                        case 4:
                            coord[0] = 0;
                            coord[1] = +1;
                            break;

                        case 5:
                            coord[0] = -0;
                            coord[1] = -0;
                            break;

                        default:
                            break;
                    }
                    break;
            }

            return coord;
        }

        private enum NeighbourSystem
        {
            Moore,
            VonNeumann
        } ;

        #endregion

        #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)
        {
            strength = TerrainUtil.MetersToSphericalStrength(strength);

            int x, y;

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

                    double z = TerrainUtil.SphericalFactor(x, y, rx, ry, strength);

                    if (z > 0) // add in non-zero amount
                    {
                        const int NEIGHBOUR_ME = 4;
                        const int NEIGHBOUR_MAX = 9;

                        double max = Double.MinValue;
                        int loc = 0;


                        for (int j = 0; j < NEIGHBOUR_MAX; j++)
                        {
                            if (j != NEIGHBOUR_ME)
                            {
                                int[] coords = Neighbours(type, j);

                                coords[0] += x;
                                coords[1] += y;

                                if (coords[0] > map.Width - 1)
                                    continue;
                                if (coords[1] > map.Height - 1)
                                    continue;
                                if (coords[0] < 0)
                                    continue;
                                if (coords[1] < 0)
                                    continue;

                                double cellmax = map[x, y] - map[coords[0], coords[1]];
                                if (cellmax > max)
                                {
                                    max = cellmax;
                                    loc = j;
                                }
                            }
                        }

                        double T = nConst / ((map.Width + map.Height) / 2.0);
                        // Apply results
                        if (0 < max && max <= T)
                        {
                            int[] maxCoords = Neighbours(type, loc);
                            double heightDelta = 0.5 * max * z * duration;
                            map[x, y] -= heightDelta;
                            map[x + maxCoords[0], y + maxCoords[1]] += heightDelta;
                        }
                    }
                }
            }
        }

        #endregion
    }
}