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