import javax.swing.*;
import java.awt.*;
import javax.swing.event.*;
import java.net.*;

//MHA en JSlider överlappa 2 bilder
public class Uppg2d extends JApplet implements ChangeListener {
    
    private JSlider js;
    private AlphaPanel alphapanel;
    private Container con;	    
    private Image image1, image2;
    private float alfa;	    
	    
    public void init() {
        setSize(640, 480);
	con = getContentPane();
        js = new JSlider(JSlider.HORIZONTAL, 0, 100, 0);
        js.addChangeListener(this);
        con.add(js, BorderLayout.SOUTH);
       
	image1 = getImage(getCodeBase(), "2a1.jpg");
        image2 = getImage(getCodeBase(), "2a2.jpg");
        alphapanel = new AlphaPanel(image1, image2);
        con.add(alphapanel, BorderLayout.CENTER);
    }
    
    public void stateChanged(ChangeEvent e) {
        repaint();
    }
    
    class AlphaPanel extends JPanel {
        private Image img1, img2;
        
        public AlphaPanel(Image image1, Image image2) {
            super();
	    img1 = image1;
            img2 = image2;
        }
    
        public void paint(Graphics g) {
            Graphics2D g2 = (Graphics2D)g;
            g2.drawImage(image1, 0, 30, this);
	    //hur starkt den ska överlappa!
	    alfa = (float)js.getValue() / 150;
            AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alfa);
            g2.setComposite(ac);
            g2.drawImage(image2, 15, 180, this);
        }//paint
    
    }//AlphaPanel
}//Uppg2d