samer@0: /*
samer@0:  *	Copyright (c) 2000, Samer Abdallah, King's College London.
samer@0:  *	All rights reserved.
samer@0:  *
samer@0:  *	This software is provided AS iS and WITHOUT ANY WARRANTY;
samer@0:  *	without even the implied warranty of MERCHANTABILITY or
samer@0:  *	FITNESS FOR A PARTICULAR PURPOSE.
samer@0:  */
samer@0: 
samer@0: package samer.maths;
samer@0: import samer.core.util.*;
samer@0: 
samer@0: /**
samer@0: 	This class maps a given interval of real numbers
samer@0: 	to the interval [0,1], returning either the real
samer@0: 	number, or converting it to an integer between 0
samer@0: 	and a given value (defaults to 256).
samer@0:  */
samer@0: 
samer@0: public class FunctionMap extends IMap
samer@0: {
samer@0: 	Function f, finv;
samer@0: 
samer@0: 	public FunctionMap(int m, Function fn) {
samer@0: 		setIntRange(m);
samer@0: 		f=fn; finv=fn.inverse();
samer@0: 		setDomain(0,1);
samer@0: 	}
samer@0: 
samer@0: 	public void setFunction(Function fn) {
samer@0: 		double t1=getDomainMin();
samer@0: 		double t2=getDomainMax();
samer@0: 		f=fn; finv=fn.inverse();
samer@0: 		setDomain(t1,t2);
samer@0: 	}
samer@0: 
samer@0: 	public double getDomainMin() { return finv.apply(super.getDomainMin()); }
samer@0: 	public double getDomainMax() { return finv.apply(super.getDomainMax()); }
samer@0: 	public void setDomain( double t1, double t2)	{
samer@0: 		super.setDomain( f.apply(t1), f.apply(t2));
samer@0: 	}
samer@0: 
samer@0: 	public final double map( double t) { return super.map(f.apply(t)); }
samer@0: 	public final int clipInt( double t) { return super.clipInt(f.apply(t)); }
samer@0: 	public final int toInt( double t) { return super.toInt(f.apply(t)); }
samer@0: 	public double inverse(double t) { return finv.apply(super.inverse(t)); }
samer@0: 	public double inverseFromInt(int i) { return finv.apply(super.inverseFromInt(i)); }
samer@0: }
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