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 ImageComposite extends JPanel implements ActionListener {
Image a = new ImageIcon(this.getClass().getResource("a.png")).getImage();
Image b = new ImageIcon(this.getClass().getResource("b.png")).getImage();
Timer timer = new Timer(800, this);
float alpha = 1f;
public ImageComposite() {
timer.start();
}
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2d = (Graphics2D) g;
BufferedImage buffImg = new BufferedImage(200, 100, BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha);
gbi.drawImage(a, 40, 30, null);
gbi.setComposite(ac);
gbi.drawImage(b, 0, 0, null);
g2d.drawImage(buffImg, 20, 20, null);
}
public void actionPerformed(ActionEvent e) {
alpha -= 0.1;
if (alpha <= 0) {
alpha = 0;
timer.stop();
}
repaint();
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.add(new ImageComposite());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300, 210);
frame.setVisible(true);
}
}