diff src/samer/core_/util/IMap.java @ 0:bf79fb79ee13

Initial Mercurial check in.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/samer/core_/util/IMap.java	Tue Jan 17 17:50:20 2012 +0000
@@ -0,0 +1,81 @@
+/*
+ *	Copyright (c) 2000, Samer Abdallah, King's College London.
+ *	All rights reserved.
+ *
+ *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
+ *	without even the implied warranty of MERCHANTABILITY or 
+ *	FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+package samer.core.util;
+
+/**
+	Integer map:
+	This class maps a given interval of real numbers
+	to the interval [0,1], returning either the real
+	number, or converting it to an integer between 0
+	and a given value (defaults to 256). 
+ */
+
+public class IMap
+{
+	double	a, b;
+	double	ia, ib;
+	int		maxi;
+	double	c;
+	boolean  clipped;
+
+	public IMap copy() { try { return (IMap)this.clone(); } catch (Exception ex) {} return null; }
+
+	public String toString() { return "["+getDomainMin()+","+getDomainMax()+")->{0.."+(maxi-1)+"}"; }
+	public double getDomainMin() { return b/a; }
+	public double getDomainMax() { return (1+b)/a; }
+	public void setDomain( double t1, double t2)
+	{
+		a	= 1/(t2-t1);
+		b	= a*t1;
+		ia  = c*a;
+		ib  = c*b;
+	}
+
+	public int	getIntRange() { return maxi+1; }
+	public void setIntRange( int m)
+	{ 
+		maxi= m-1; 
+		c   = m;
+		ia  = c*a;
+		ib  = c*b;
+	}
+
+	public double map( double t) { return a*t-b; }
+	public int clipInt( double t)
+	{
+		double x=ia*t-ib;
+		if (x<0)	return 0;
+		if (x>=c)	return maxi;
+		return (int)x;
+	}
+
+	// sets a flag if clipped
+	public int toInt( double t)
+	{
+		double x=ia*t-ib;
+		clipped = (x<0 || x>=c);
+		return (int)x;
+	}
+
+	// inverse mapping
+	public double inverse(double y) { return (y+b)/a; }
+	public double inverseFromInt(int y) { return (y+ib)/ia; }
+
+	public boolean wasClipped() { return clipped; }
+	protected IMap() {}
+}
+
+
+
+
+
+	
+
+