FlattenArea.cs

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using OpenSim.Region.Framework.Interfaces;

namespace OpenSim.Region.CoreModules.World.Terrain.FloodBrushes
{
    public class FlattenArea : ITerrainFloodEffect
    {
        #region ITerrainFloodEffect Members

        public void FloodEffect(ITerrainChannel map, bool[,] fillArea, double strength,
            int startX, int endX, int startY, int endY)
        {
            double sum = 0.0;
            double steps = 0.0;

            int x, y;
            for (x = startX; x <= endX; x++)
            {
                for (y = startY; y <= endY; y++)
                {
                    if (fillArea[x, y])
                    {
                        sum += map[x, y];
                        steps += 1.0;
                    }
                }
            }

            double avg = sum / steps;

            double str = 0.1 * strength; // == 0.2 in the default client

            for (x = startX; x <= endX; x++)
            {
                for (y = startY; y <= endY; y++)
                {
                    if (fillArea[x, y])
                        map[x, y] = (map[x, y] * (1.0 - str)) + (avg * str);
                }
            }
        }

        #endregion
    }
}