replicatescaletest.java

corejava的一部分源码,与corejiavasource中的有区别。

import java.net.URL;
import java.applet.Applet;
import java.awt.*;
import java.awt.image.*;

public class ReplicateScaleTest extends Applet {
 	private Image im;
	private Image big, small;
	private int imw, imh;

	public void init() {
		MediaTracker mt  = new MediaTracker(this);
		URL 		 url = getClass().getResource("pic.jpg");

		try {
			im = createImage((ImageProducer)url.getContent());
			mt.addImage(im, 0);
			mt.waitForID(0);
		}
		catch(Exception e) { e.printStackTrace(); }	

		imw = im.getWidth(this);
		imh = im.getHeight(this);

		ImageFilter bigFilter = 
			new ReplicateScaleFilter(imw*2, imh*2);

		ImageFilter smallFilter = 
			new ReplicateScaleFilter(imw/2, imh/2);

		FilteredImageSource bigSource = 
			new FilteredImageSource(im.getSource(), bigFilter);

		FilteredImageSource smallSource = 
			new FilteredImageSource(im.getSource(), smallFilter);

		big 	= createImage(bigSource);	
		small 	= createImage(smallSource);	
	}
	public void paint(Graphics g) {
		g.drawImage(im,0,0,this);
	  	g.drawImage(small,imw,0,this);
		g.drawImage(big,imw,imh/2,this);
	}
}