samer@0: package	samer.units;
samer@0: import 	samer.core.*;
samer@0: import 	samer.core.types.*;
samer@0: import 	samer.maths.*;
samer@0: import		java.util.*;
samer@0: 
samer@0: public class Oscillator implements Generator
samer@0: {
samer@0: 	double c, s;
samer@0: 	double x1, x2;
samer@0: 
samer@0: 	public Oscillator(double f) {	setFrequency(f); reset(); }
samer@0: 
samer@0: 	public DoubleModel getFrequencyModel() {
samer@0: 		return new DoubleModel() {
samer@0: 			public void set(double f) { setFrequency(f); }
samer@0: 			public double get() { return Math.atan(s/c); }
samer@0: 		};
samer@0: 	}
samer@0: 
samer@0: 	public void reset() { x1=1; x2=0; }
samer@0: 	public void setFrequency(double f) {
samer@0: 		s=Math.sin(f);
samer@0: 		c=Math.cos(f);
samer@0: 	}
samer@0: 
samer@0: 	public void dispose() {}
samer@0: 	public double next()
samer@0: 	{
samer@0: 		double y1 = x1*c - x2*s;
samer@0: 		double y2 = x1*s + x2*c;
samer@0: 		x1=y1; x2=y2;
samer@0: 		return x2;
samer@0: 	}
samer@0: 
samer@0: 	public void next(double [] x)	{
samer@0: 		for (int i=0; i<x.length; i++) x[i]=next();
samer@0: 	}
samer@0: 
samer@0: 	public String toString() { return "oscillator"; }
samer@0: }
samer@0: 
samer@0: