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: import samer.core.*;
samer@0: import samer.core.util.*;
samer@0: import java.awt.image.*;
samer@0: import java.awt.Color;
samer@0: import java.util.*;
samer@0: 
samer@0: import java.util.Hashtable;
samer@0: 
samer@0: /**
samer@0: 		<p>
samer@0: 		Base class for image producers. Derived classes
samer@0: 		must do the following:
samer@0: 		<ul>
samer@0: 			<li>	set width and height <b>before<b> any
samer@0: 					consumers are added
samer@0: 			<li>  implement getHints()
samer@0: 			<li>	implement sendPixels(ImageConsumer)
samer@0: 		</ul>
samer@0: 
samer@0:  */
samer@0: 
samer@0: public abstract class ImageSourceBase implements ImageProducer
samer@0: {
samer@0: 	private		Hashtable			properties = new Hashtable();
samer@0: 	private		Vector				consumers = new Vector();
samer@0: 	protected	IndexColorModel	model = GREY;
samer@0: 	protected	int					width, height;
samer@0: 	protected	IMap					map = new LinearMap(model.getMapSize());
samer@0: 
samer@0: 	protected abstract int  getHints();
samer@0: 	protected abstract void sendPixels(ImageConsumer ic);
samer@0: 
samer@0: 	public IMap	getMap() { return map; }
samer@0: 	public void	setMap(IMap m) { map=m; m.setIntRange(model.getMapSize()); }
samer@0: 
samer@0: 	public int  getWidth() { return width; }
samer@0: 	public int  getHeight() { return height; }
samer@0: 	public void setColorModel(IndexColorModel cm) {
samer@0: 		model=cm; map.setIntRange(model.getMapSize());
samer@0: 
samer@0: 		Enumeration cons = consumers.elements();
samer@0: 		while (cons.hasMoreElements()) {
samer@0:     		ImageConsumer ic = (ImageConsumer)cons.nextElement();
samer@0: 			ic.setColorModel(model);
samer@0: 		}
samer@0: 	}
samer@0: 
samer@0: 	public void startProduction(ImageConsumer ic) { addConsumer(ic); }
samer@0: 	public void requestTopDownLeftRightResend(ImageConsumer ic) {}
samer@0: 	public synchronized boolean isConsumer(ImageConsumer ic) { return consumers.contains(ic); }
samer@0: 	public synchronized void removeConsumer(ImageConsumer ic) {	consumers.removeElement(ic); }
samer@0: 	public synchronized void addConsumer(ImageConsumer ic)
samer@0: 	{
samer@0: 		if (consumers.contains(ic)) return;
samer@0: 		consumers.addElement(ic);
samer@0: 
samer@0: 		try {
samer@0: 			ic.setDimensions(width, height);
samer@0: 			ic.setProperties(properties);
samer@0: 			ic.setColorModel(model);
samer@0: 			ic.setHints(getHints());
samer@0: 			sendPixels(ic);
samer@0: 			ic.imageComplete( ImageConsumer.SINGLEFRAMEDONE);
samer@0: 		} catch (Exception e) {
samer@0: 			ic.imageComplete(ImageConsumer.IMAGEERROR);
samer@0: 		}
samer@0: 	}
samer@0: 
samer@0: 
samer@0: 	public void sendPixels()
samer@0: 	{
samer@0: 		Enumeration cons = consumers.elements();
samer@0: 		while (cons.hasMoreElements()) {
samer@0:     		ImageConsumer ic = (ImageConsumer)cons.nextElement();
samer@0: 			ic.setDimensions(width, height);
samer@0: 			ic.setProperties(properties);
samer@0: 			ic.setColorModel(model);
samer@0: 			ic.setHints(getHints());
samer@0: 			sendPixels(ic);
samer@0: 			ic.imageComplete( ImageConsumer.SINGLEFRAMEDONE);
samer@0: 		}
samer@0: 	}
samer@0: 
samer@0: 	public static IndexColorModel	GREY,GREEN;
samer@0: 	static {
samer@0: 		ColorRamp	r = new ColorRamp(256);
samer@0: 		r.gradient(Color.black,Color.white); GREY = r.getColorModel();
samer@0: 	}
samer@0: }