comparison src/samer/tools/ImageViewer.java @ 0:bf79fb79ee13

Initial Mercurial check in.

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