opensim/trunk/OpenSim/Region/Terrain.BasicTerrain/libTerrainBSD/Channel/Operators.cs

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*/

using System;

namespace libTerrain
{
    partial class Channel
    {
        /* Operator combination of channel datatypes */

        public static Channel operator +(Channel A, Channel B)
        {
            if (A.h != B.h)
                throw new Exception("Cannot add heightmaps, of different height.");
            if (A.w != B.w)
                throw new Exception("Cannot add heightmaps, of different width.");

            int x, y;

            for (x = 0; x < A.w; x++)
            {
                for (y = 0; y < A.h; y++)
                {
                    if (B.map[x, y] != 0)
                        A.SetDiff(x, y);

                    A.map[x, y] += B.map[x, y];
                }
            }

            return A;
        }

        public static Channel operator *(Channel A, Channel B)
        {
            if (A.h != B.h)
                throw new Exception("Cannot multiply heightmaps, of different height.");
            if (A.w != B.w)
                throw new Exception("Cannot multiply heightmaps, of different width.");

            int x, y;

            for (x = 0; x < A.w; x++)
            {
                for (y = 0; y < A.h; y++)
                {
                    A.map[x, y] *= B.map[x, y];
                }
            }

            A.SetDiff();

            return A;
        }

        public static Channel operator -(Channel A, Channel B)
        {
            if (A.h != B.h)
                throw new Exception("Cannot subtract heightmaps, of different height.");
            if (A.w != B.w)
                throw new Exception("Cannot subtract heightmaps, of different width.");

            int x, y;

            for (x = 0; x < A.w; x++)
            {
                for (y = 0; y < A.h; y++)
                {
                    if (B.map[x, y] != 0)
                        A.SetDiff(x, y);
                    A.map[x, y] -= B.map[x, y];
                }
            }

            return A;
        }

        public static Channel operator /(Channel A, Channel B)
        {
            if (A.h != B.h)
                throw new Exception("Cannot divide heightmaps, of different height.");
            if (A.w != B.w)
                throw new Exception("Cannot divide heightmaps, of different width.");

            int x, y;

            for (x = 0; x < A.w; x++)
            {
                for (y = 0; y < A.h; y++)
                {
                    A.map[x, y] /= B.map[x, y];
                }
            }

            A.SetDiff();

            return A;
        }

        public static Channel operator ^(Channel A, Channel B)
        {
            if (A.h != B.h)
                throw new Exception("Cannot divide heightmaps, of different height.");
            if (A.w != B.w)
                throw new Exception("Cannot divide heightmaps, of different width.");

            int x, y;

            for (x = 0; x < A.w; x++)
            {
                for (y = 0; y < A.h; y++)
                {
                    A.map[x, y] = Math.Pow(A.map[x, y], B.map[x, y]);
                }
            }

            A.SetDiff();

            return A;
        }


        /* Operator combination of channel and double datatypes */

        public static Channel operator +(Channel A, double B)
        {
            int x, y;

            for (x = 0; x < A.w; x++)
            {
                for (y = 0; y < A.h; y++)
                {
                    A.map[x, y] += B;
                }
            }

            if (B != 0)
                A.SetDiff();

            return A;
        }

        public static Channel operator -(Channel A, double B)
        {
            int x, y;

            for (x = 0; x < A.w; x++)
            {
                for (y = 0; y < A.h; y++)
                {
                    A.map[x, y] -= B;
                }
            }

            if (B != 0)
                A.SetDiff();

            return A;
        }

        public static Channel operator *(Channel A, double B)
        {
            int x, y;

            for (x = 0; x < A.w; x++)
            {
                for (y = 0; y < A.h; y++)
                {
                    A.map[x, y] *= B;
                }
            }

            if (B != 1)
                A.SetDiff();

            return A;
        }

        public static Channel operator /(Channel A, double B)
        {
            int x, y;

            for (x = 0; x < A.w; x++)
            {
                for (y = 0; y < A.h; y++)
                {
                    A.map[x, y] /= B;
                }
            }

            if (B != 1)
                A.SetDiff();

            return A;
        }

        public static Channel operator ^(Channel A, double B)
        {
            int x, y;

            for (x = 0; x < A.w; x++)
            {
                for (y = 0; y < A.h; y++)
                {
                    A.map[x, y] = Math.Pow(A.map[x, y], B);
                }
            }

            A.SetDiff();

            return A;
        }
    }
}