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.core.util.heavy;
samer@0: import  samer.core.util.*;
samer@0: import  samer.core.*;
samer@0: import  java.awt.*;
samer@0: import  java.util.*;
samer@0: 
samer@0: public class Meter extends VCanvas
samer@0: {
samer@0: 	IMap	map;
samer@0: 	int		lasti, nexti;
samer@0: 	double	x=0;
samer@0: 
samer@0: 	public Meter() { map = new LinearMap(0,1); lasti=0; }
samer@0: 
samer@0: 	public void exposeMap() { exposeMap(true); }
samer@0: 	public void exposeMap(boolean reinit) {
samer@0: 		final VMap	vmap=new VMap(map,reinit);
samer@0: 		vmap.addObserver( new Observer() {
samer@0: 			public void update(Observable o, Object args) {
samer@0: 				if (args==VMap.NEW_MAP) setMap(vmap.getMap());
samer@0: 				nexti=map.toInt(x); repaint(); 
samer@0: 			}
samer@0: 		} );
samer@0: 		vmap.changed();
samer@0: 		exposeCommands(vmap);
samer@0: 	}
samer@0: 	
samer@0: 	public void paint(Graphics g)
samer@0: 	{
samer@0: 		lasti=nexti=map.toInt(x);
samer@0: 		g.setColor(getBackground());
samer@0: 		g.fillRect(lasti,0,width-lasti,height);
samer@0: 		g.setColor(getForeground());
samer@0: 		g.fillRect(0,0,lasti,height);
samer@0: 	}
samer@0: 
samer@0: 	public void update(Graphics g)
samer@0: 	{
samer@0: 		if (nexti>lasti) {
samer@0: 			g.setColor(getForeground());
samer@0: 			g.fillRect(lasti,0,nexti-lasti,height);
samer@0: 		} else if (nexti<lasti) {
samer@0: 			g.setColor(getBackground());
samer@0: 			g.fillRect(nexti,0,lasti-nexti,height);
samer@0: 		}	
samer@0: 		lasti=nexti;
samer@0: 	}
samer@0: 
samer@0: 	protected void realized() {}
samer@0: 	public void next( double x) { 
samer@0: 		nexti=map.toInt(x); this.x=x;
samer@0: 		if (nexti!=lasti) repaint(); 
samer@0: 	}
samer@0: 
samer@0: 	public Dimension getPreferredSize() { return new Dimension(96,6); }
samer@0: 	public Dimension getMinimumSize() { return new Dimension(32,4); }
samer@0: 
samer@0: 	public IMap getMap() { return map; }
samer@0: 	public void setMap(IMap m) { map=m; lasti=0; repaint(); }
samer@0: 	protected void sized() { map.setIntRange(width); }
samer@0: }