/*
* __ .__ .__ ._____.
* _/ |_ _______ __|__| ____ | | |__\_ |__ ______
* \ __\/ _ \ \/ / |/ ___\| | | || __ \ / ___/
* | | ( <_> > <| \ \___| |_| || \_\ \\___ \
* |__| \____/__/\_ \__|\___ >____/__||___ /____ >
* \/ \/ \/ \/
*
* 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.waves;
import spimedb.util.math.MathUtils;
/**
* Implements a frequency modulated triangular wave with its peak at PI: "/\"
*/
public class FMTriangleWave extends AbstractWave {
public AbstractWave fmod;
public FMTriangleWave(float phase, float freq) {
this(phase, freq, 1, 0);
}
public FMTriangleWave(float phase, float freq, float amp, float offset) {
this(phase, freq, amp, offset, new ConstantWave(0));
}
public FMTriangleWave(float phase, float freq, float amp, float offset,
AbstractWave fmod) {
super(phase, freq, amp, offset);
this.fmod = fmod;
}
/*
* (non-Javadoc)
*
* @see toxi.math.waves.AbstractWave#pop()
*/
@Override
public void pop() {
super.pop();
fmod.pop();
}
/*
* (non-Javadoc)
*
* @see toxi.math.waves.AbstractWave#push()
*/
@Override
public void push() {
super.push();
fmod.push();
}
/**
* Resets this wave and its modulating wave as well.
*
* @see AbstractWave#reset()
*/
public void reset() {
super.reset();
fmod.reset();
}
@Override
public float update() {
value = 2 * amp * (Math.abs(PI - phase) * MathUtils.INV_PI - 0.5f)
+ offset;
cyclePhase(frequency + fmod.update());
return value;
}
}