NoiseModifier.cs

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 *       derived from this software without specific prior written permission.
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 * 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.CoreModules.World.Terrain;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;

namespace OpenSim.Region.CoreModules.World.Terrain.Modifiers
{
    public class NoiseModifier : TerrainModifier
    {
        public NoiseModifier(ITerrainModule module) : base(module)
        {
        }

        public override string ModifyTerrain(ITerrainChannel map, string[] args)
        {
            string result;
            if (args.Length < 3)
            {
                result = "Usage: " + GetUsage();
            }
            else
            {
                TerrainModifierData data;
                result = this.parseParameters(args, out data);

                // Context-specific validation
                if (result == String.Empty)
                {
                    if (data.bevel == "taper")
                    {
                        if (data.bevelevation < 0.0 || data.bevelevation > 1.0)
                        {
                            result = String.Format("Taper must be 0.0 to 1.0: {0}", data.bevelevation);
                        }
                    }
                    else
                    {
                        data.bevelevation = 1.0f;
                    }

                    if (data.elevation < 0.0 || data.elevation > 1.0)
                    {
                        result = String.Format("Noise strength must be 0.0 to 1.0: {0}", data.elevation);
                    }

                    if (data.shape == String.Empty)
                    {
                        data.shape = "rectangle";
                        data.x0 = 0;
                        data.y0 = 0;
                        data.dx = map.Width;
                        data.dy = map.Height;
                    }
                }

                // if it's all good, then do the work
                if (result == String.Empty)
                {
                    this.applyModification(map, data);
                }
            }

            return result;
        }

        public override string GetUsage()
        {
            string val = "noise <delta> [ -rec=x1,y1,dx[,dy] | -ell=x0,y0,rx[,ry] ] [-taper=<delta2>]"
                                + "\nAdds noise to all points within the specified range.";
            return val;
        }

        public override double operate(double[,] map, TerrainModifierData data, int x, int y)
        {
            double factor = this.computeBevel(data, x, y);
            double noise = TerrainUtil.PerlinNoise2D((double)x / map.GetLength(0), (double)y / map.GetLength(1), 8, 1.0);
            return map[x, y] + (data.elevation - (data.elevation - data.bevelevation) * factor) * (noise - .5);
        }

    }

}