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.tools;
samer@0: 
samer@0: import java.awt.*;
samer@0: import java.awt.image.*;
samer@0: import java.util.*;
samer@0: import samer.core.*;
samer@0: import samer.core.util.*;
samer@0: 
samer@0: /**
samer@0: 	A base class for displaying images of real values.
samer@0: 	All that is needed is an ImageSource that implements
samer@0: 	ImageSourceBase. The ImageViewer provides a VMap
samer@0: 	for the IMap in the ImageSourceBase, and exposes the
samer@0: 	VMaps commands in a popup menu.
samer@0:   */
samer@0: 
samer@0: public class ImageViewer extends samer.core.util.heavy.VCanvas implements Observer, Agent
samer@0: {
samer@0: 	protected ImageSourceBase	ip;
samer@0: 	protected Image		img;
samer@0: 	protected VMap		map;
samer@0: 	protected Observable obs;
samer@0: 	protected int			cx=1, cy=1, iw, ih;
samer@0: 	private boolean		autoscale=false;
samer@0: 
samer@0: 	public ImageViewer( ImageSourceBase source, Observable o)
samer@0: 	{
samer@0: 		map = new VMap(source.getMap());
samer@0: 		source.setMap(map.getMap());
samer@0: 		source.setColorModel(
samer@0: 			(IndexColorModel)Shell.datum("colormap")
samer@0: 				.get(ColorModelCodec,ImageSourceBase.GREY));
samer@0: 
samer@0: 		ip	 = source; obs = o;
samer@0: 		img = createImage(ip);
samer@0: 		iw=img.getWidth(null);
samer@0: 		ih=img.getHeight(null);
samer@0: 
samer@0: 		int cz=Shell.getInt("cell.size",4);
samer@0: 		cx=Shell.getInt("cell.width",cz);
samer@0: 		cy=Shell.getInt("cell.height",cz);
samer@0: 
samer@0: 		exposeCommands( this);
samer@0: 		exposeCommands( map);
samer@0: 		map.addObserver(this);
samer@0: 	}
samer@0: 
samer@0: 	public void scale() {}
samer@0: 	public void update(Observable o, Object s)
samer@0: 	{
samer@0: 		if (s==this) return;
samer@0: 		else if (s==VMap.NEW_MAP) ip.setMap(map.getMap());
samer@0: 		else if (s==Viewable.DISPOSING) {
samer@0: 			if (o==obs) Shell.releaseViewer(this); return;
samer@0: 		}
samer@0: 
samer@0: 		if (autoscale) scale();
samer@0: 		ip.sendPixels();
samer@0: 		if (s instanceof Point) {
samer@0: 			Point p=(Point)s;
samer@0: 			int x=(2*p.x*width+iw)/(2*iw);
samer@0: 			int y=(2*p.y*height+ih)/(2*ih);
samer@0: 			int w=(width+iw-1)/iw;
samer@0: 			int h=(height+ih-1)/ih;
samer@0: 			y=height-y-h;
samer@0: 			repaint(0,x,y,w,h);
samer@0: 		} else repaint(0,0,0,width,height);
samer@0: 	}
samer@0: 
samer@0: 	public void attach() { super.attach(); if (obs!=null) obs.addObserver(this);	}
samer@0: 	public void detach()	{ if (obs!=null) obs.deleteObserver(this); super.detach();	}
samer@0: 
samer@0: 	// .............. Agent bits ..............................
samer@0: 
samer@0: 	public void getCommands(Registry r)	{
samer@0: 		r.add("scale").add("autoscale",autoscale).add("update");
samer@0: 		r.group(); r.add("publish");
samer@0: 	}
samer@0: 
samer@0: 	public void execute(String c, Environment env) throws Exception
samer@0: 	{
samer@0: 		if (c.equals("scale"))	{ scale(); update(null,null); }
samer@0: 		else if	(c.equals("autoscale")) {
samer@0: 			autoscale = X._bool(env.datum(),!autoscale);
samer@0: 			if (autoscale) update(null,null);
samer@0: 		} else if (c.equals("update")) { update(null,null); }
samer@0: 		else if (c.equals("publish"))
samer@0: 			Shell.put(X.string(env.datum(),"image"),this);
samer@0: 	}
samer@0: 
samer@0: 	// .............. The rest ...............................
samer@0: 
samer@0: 	public VMap getVMap() { return map; }
samer@0: 	public IMap getMap() { return ip.getMap(); }
samer@0: 	public void setMap(IMap map) { ip.setMap(map); }
samer@0: 	public void	setColorModel( IndexColorModel cm) {
samer@0: 		ip.setColorModel(cm);
samer@0: 		ip.sendPixels();
samer@0: 		repaint();
samer@0: 	}
samer@0: 
samer@0: 	public void update(Graphics g) {
samer@0: 		g.drawImage( img, 0, 0, width, height, null);
samer@0: 	}
samer@0: 
samer@0: 	public void paint( Graphics g) {
samer@0: 		g.drawImage( img, 0, 0, width, height, null);
samer@0: 	}
samer@0: 
samer@0: 	public void setCellSize( int w, int h) { cx=w; cy=h; }
samer@0: 	public Dimension getPreferredSize() {
samer@0: 		return new Dimension(cx*ip.width,cy*ip.height);
samer@0: 	}
samer@0: 
samer@0: 	public static Environment.Codec ColorModelCodec = new Environment.Codec()
samer@0: 	{
samer@0: 		public Class targetClass() { return IndexColorModel.class; }
samer@0: 
samer@0: 		public String string(Object o) { return o.toString(); } // ??
samer@0: 		public Object object(Object o) { return o; }
samer@0: 		public Object decode(Object o) {
samer@0: 			if (o instanceof IndexColorModel) return o;
samer@0: 			return Shell.datum(o.toString()).get(this,null);
samer@0: 		}
samer@0: 	};
samer@0: }