LowerModifier.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.CoreModules.World.Terrain;
using OpenSim.Region.Framework.Interfaces;

namespace OpenSim.Region.CoreModules.World.Terrain.Modifiers
{
    public class LowerModifier : TerrainModifier
    {
        public LowerModifier(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.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 = "lower <delta> [ -rec=x1,y1,dx[,dy] | -ell=x0,y0,rx[,ry] ] [-taper=<delta2>]"
                            + "\nLowers all points within the specified range by the specified amount.";
            return val;

        }

        public override double operate(double[,] map, TerrainModifierData data, int x, int y)
        {
            double factor = this.computeBevel(data, x, y);
            double result = map[x, y] - (data.elevation - (data.elevation - data.bevelevation) * factor);
            return result;
        }

    }

}