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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.Interp;
import libnoiseforjava.exception.ExceptionInvalidParam;
public class Blend extends ModuleBase
{
/// Noise module that outputs a weighted blend of the output values from
/// two source modules given the output value supplied by a control module.
///
/// Unlike most other noise modules, the index value assigned to a source
/// module determines its role in the blending operation:
/// - Source module 0 outputs one of the
/// values to blend.
/// - Source module 1 outputs one of the
/// values to blend.
/// - Source module 2 is known as the <i>control
/// module</i>. The control module determines the weight of the
/// blending operation. Negative values weigh the blend towards the
/// output value from the source module with an index value of 0.
/// Positive values weigh the blend towards the output value from the
/// source module with an index value of 1.
///
/// An application can pass the control module to the setControlModule()
/// method instead of the setSourceModule() method. This may make the
/// application code easier to read.
///
/// This noise module uses linear interpolation to perform the blending
/// operation.
///
/// This noise module requires three source modules.
public Blend (ModuleBase sourceModuleOne, ModuleBase sourceModuleTwo,
ModuleBase sourceModuleThree) throws ExceptionInvalidParam
{
super(3);
setSourceModule(0, sourceModuleOne);
setSourceModule(1, sourceModuleTwo);
setSourceModule(2, sourceModuleThree);
}
public double getValue (double x, double y, double z)
{
assert (sourceModules[0] != null);
assert (sourceModules[1] != null);
assert (sourceModules[2] != null);
double v0 = sourceModules[0].getValue (x, y, z);
double v1 = sourceModules[1].getValue (x, y, z);
double alpha = (sourceModules[2].getValue (x, y, z) + 1.0) / 2.0;
return Interp.linearInterp (v0, v1, alpha);
}
}
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