/*
* __ .__ .__ ._____.
* _/ |_ _______ __|__| ____ | | |__\_ |__ ______
* \ __\/ _ \ \/ / |/ ___\| | | || __ \ / ___/
* | | ( <_> > <| \ \___| |_| || \_\ \\___ \
* |__| \____/__/\_ \__|\___ >____/__||___ /____ >
* \/ \/ \/ \/
*
* Copyright (c) 2006-2011 Karsten Schmidt
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* http://creativecommons.org/licenses/LGPL/2.1/
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
package spimedb.util.math;
/**
* Exponential curve interpolation with adjustable exponent. Use exp in the
* following ranges to achieve these effects:
* <ul>
* <li>0.0 < x < 1.0 : ease in (steep changes towards b)</li>
* <li>1.0 : same as {@link LinearInterpolation}</li>
* <li>> 1.0 : ease-out (steep changes from a)</li>
* </ul>
*/
public class ExponentialInterpolation implements InterpolateStrategy {
private final float exponent;
/**
* Default constructor uses square parabola (exp=2)
*/
public ExponentialInterpolation() {
this(2);
}
/**
* @param exp
* curve exponent
*/
public ExponentialInterpolation(float exp) {
this.exponent = exp;
}
public double interpolate(double a, double b, double f) {
return a + (b - a) * Math.pow(f, exponent);
}
public float interpolate(float a, float b, float f) {
return a + (b - a) * (float) Math.pow(f, exponent);
}
}