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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.exception.ExceptionInvalidParam;
public class Exponent extends ModuleBase
{
/// Noise module that maps the output value from a source module onto an
/// exponential curve.
///
/// Because most noise modules will output values that range from -1.0 to
/// +1.0, this noise module first normalizes this output value (the range
/// becomes 0.0 to 1.0), maps that value onto an exponential curve, then
/// rescales that value back to the original range.
///
/// This noise module requires one source module.
/// Default exponent for the Exponent noise module.
static final double DEFAULT_EXPONENT = 1.0;
/// Exponent to apply to the output value from the source module.
double exponent;
public Exponent (ModuleBase sourceModule) throws ExceptionInvalidParam
{
super(1);
setSourceModule(0, sourceModule);
exponent = DEFAULT_EXPONENT;
}
public double getValue (double x, double y, double z)
{
assert (sourceModules[0] != null);
double value = sourceModules[0].getValue (x, y, z);
return (Math.pow (Math.abs ((value + 1.0) / 2.0), exponent) * 2.0 - 1.0);
}
/// Returns the exponent value to apply to the output value from the
/// source module.
///
/// @returns The exponent value.
public double getExponent ()
{
return exponent;
}
public void setExponent(double exponent)
{
this.exponent = exponent;
}
}
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