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SunAndCloud.java


import java.awt.AlphaComposite;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;


public class SunAndCloud extends JPanel implements ActionListener {

Image sun;
Image cloud;
Timer timer;
private float alpha;

public SunAndCloud() {
sun = new ImageIcon(this.getClass().getResource("sun.png")).getImage();
cloud = new ImageIcon(this.getClass().getResource("cloud.png")).getImage();
timer = new Timer(800, this);
timer.start();
alpha = 1f;
}

public void paint(Graphics g) {
super.paint(g);
Graphics2D g2d = (Graphics2D) g;

BufferedImage buffImg = new BufferedImage(220, 140,
BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();

AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha);

gbi.drawImage(sun, 40, 30, null);
gbi.setComposite(ac);
gbi.drawImage(cloud, 0, 0, null);

g2d.drawImage(buffImg, 20, 20, null);
}

public static void main(String[] args) {

JFrame frame = new JFrame("Sun & Cloud");
frame.add(new SunAndCloud());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300, 210);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}


public void actionPerformed(ActionEvent e) {
alpha -= 0.1;
if (alpha <= 0) {
alpha = 0;
timer.stop();
}
repaint();
}
}