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/*
* Copyright 2011 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.unitgen;
/**
* A simple sine wave generator for a Grain. This uses the same fast Taylor expansion that the
* SineOscillator uses.
*
* @author Phil Burk (C) 2011 Mobileer Inc
*/
public class GrainSourceSine extends GrainCommon implements GrainSource {
protected double phase;
protected double phaseIncrement;
public GrainSourceSine() {
setRate(1.0);
}
public void setPhaseIncrement(double phaseIncrement) {
this.phaseIncrement = phaseIncrement;
}
@Override
public double next() {
phase += phaseIncrement;
if (phase > 1.0) {
phase -= 2.0;
}
return SineOscillator.fastSin(phase);
}
@Override
public void setRate(double rate) {
setPhaseIncrement(rate * 0.1 / Math.PI);
}
}
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