130 lines
4.9 KiB
C#
130 lines
4.9 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSim Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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using OpenSim.Region.Environment.Interfaces;
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namespace OpenSim.Region.Environment.Modules.Terrain.PaintBrushes
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{
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public class SmoothSphere : ITerrainPaintableEffect
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{
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private double SphericalFactor(double x, double y, double rx, double ry, double size)
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{
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double z = size * size - ((x - rx) * (x - rx) + (y - ry) * (y - ry));
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return z;
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}
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private double GetBilinearInterpolate(double x, double y, ITerrainChannel map)
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{
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int w = map.Width;
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int h = map.Height;
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if (x > w - 2.0)
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x = w - 2.0;
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if (y > h - 2.0)
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y = h - 2.0;
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if (x < 0.0)
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x = 0.0;
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if (y < 0.0)
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y = 0.0;
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int stepSize = 1;
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double h00 = map[(int)x, (int)y];
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double h10 = map[(int)x + stepSize, (int)y];
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double h01 = map[(int)x, (int)y + stepSize];
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double h11 = map[(int)x + stepSize, (int)y + stepSize];
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double h1 = h00;
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double h2 = h10;
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double h3 = h01;
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double h4 = h11;
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double a00 = h1;
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double a10 = h2 - h1;
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double a01 = h3 - h1;
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double a11 = h1 - h2 - h3 + h4;
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double partialx = x - (int)x;
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double partialz = y - (int)y;
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double hi = a00 + (a10 * partialx) + (a01 * partialz) + (a11 * partialx * partialz);
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return hi;
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}
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#region ITerrainPaintableEffect Members
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public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength)
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{
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int x, y;
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double[,] tweak = new double[map.Width, map.Height];
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double n, l;
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double area = strength;
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double step = strength / 4.0;
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// compute delta map
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for (x = 0; x < map.Width; x++)
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{
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for (y = 0; y < map.Height; y++)
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{
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double z = SphericalFactor(x, y, rx, ry, strength);
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if (z > 0) // add in non-zero amount
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{
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double average = 0.0;
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int avgsteps = 0;
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for (n = 0.0 - area; n < area; n += step)
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{
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for (l = 0.0 - area; l < area; l += step)
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{
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avgsteps++;
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average += GetBilinearInterpolate(x + n, y + l, map);
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}
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}
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tweak[x, y] = average / avgsteps;
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}
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}
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}
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// blend in map
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for (x = 0; x < map.Width; x++)
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{
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for (y = 0; y < map.Height; y++)
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{
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double z = SphericalFactor(x, y, rx, ry, strength);
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if (z > 0) // add in non-zero amount
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{
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double da = z;
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double a = (map[x, y] - tweak[x, y]) * da;
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double newz = map[x, y] - a;
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if (newz > 0.0)
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map[x, y] = newz;
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}
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}
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}
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}
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#endregion
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}
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} |