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/*
* Copyright (C) 2003, 2004 Jason Bevins (original libnoise code)
* Copyright 2010 Thomas J. Hodge (java port of libnoise)
*
* This file is part of libnoiseforjava.
*
* libnoiseforjava is a Java port of the C++ library libnoise, which may be found at
* http://libnoise.sourceforge.net/. libnoise was developed by Jason Bevins, who may be
* contacted at jlbezigvins@gmzigail.com (for great email, take off every 'zig').
* Porting to Java was done by Thomas Hodge, who may be contacted at
* libnoisezagforjava@gzagmail.com (remove every 'zag').
*
* libnoiseforjava is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* libnoiseforjava is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* libnoiseforjava. If not, see <http://www.gnu.org/licenses/>.
*
*/
package libnoiseforjava.module;
import libnoiseforjava.NoiseGen;
public class Checkerboard extends ModuleBase
{
/// Noise module that outputs a checkerboard pattern.
///
/// This noise module outputs unit-sized blocks of alternating values.
/// The values of these blocks alternate between -1.0 and +1.0.
///
/// This noise module is not really useful by itself, but it is often used
/// for debugging purposes.
///
/// This noise module does not require any source modules.
public Checkerboard()
{
super(0);
}
public double getValue (double x, double y, double z)
{
int ix = (int)(Math.floor(NoiseGen.MakeInt32Range (x)));
int iy = (int)(Math.floor(NoiseGen.MakeInt32Range (y)));
int iz = (int)(Math.floor(NoiseGen.MakeInt32Range (z)));
// original was
//(ix & 1 ^ iy & 1 ^ iz & 1)
// not certain if this duplicates it or not
if ((ix%2 == 1) ^ (iy%2 == 1) ^ (iz%2 == 1))
return -1.0;
else
return 1.0;
}
}
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