HOY_Composite.java

//EJEMPLO DE SOBREPOSICION DE IMAGENES
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import ju.ch09.MyMenu;
import ju.ch09.MyMenuBar;

public class Composite extends Frame {
 static float alpha = 0.5f;
 static final int width = 600;
 static final int height = 400;
 MyMenuBar menuBar;
 EventHandler eh = new EventHandler(); 
 public static void main(String args[]){
  if(args.length>0) alpha = (new Float(args[0])).floatValue(); 
  Composite app = new Composite();
 }
 public Composite() {
  super("Composite");
  setupMenuBar();
  add("Center",new MyCanvas());
  setSize(width,height);
  addWindowListener(eh);
  show();
 }
 void setupMenuBar(){
  Object menuItems[][] = {{"File","Exit"}};
  menuBar = new MyMenuBar(menuItems,eh,eh);
  setMenuBar(menuBar);
 }
 class MyCanvas extends Canvas {
  public void paint(Graphics graphics) {
   Graphics2D g = (Graphics2D) graphics;
   AlphaComposite composite = 
    AlphaComposite.getInstance(AlphaComposite.SRC_OVER,alpha);
   g.setComposite(composite);
   Toolkit toolkit = Toolkit.getDefaultToolkit();
   Image image0 = toolkit.getImage("image0.gif");
   Image image1 = toolkit.getImage("image1.gif");
   g.drawImage(image0,200,100,this);
   g.drawImage(image1,100,150,this);
  }
 }
 class EventHandler extends WindowAdapter implements ActionListener,
   ItemListener {
  public void actionPerformed(ActionEvent e){
   String selection=e.getActionCommand();
   if("Exit".equals(selection)){
    System.exit(0);
   }
  }
  public void itemStateChanged(ItemEvent e){
  }
  public void windowClosing(WindowEvent e){
   System.exit(0);
  }
 }
}