import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Main extends JPanel {
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.DST_ATOP, 0.5f);
BufferedImage buffImg = new BufferedImage(60, 60, BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();
gbi.setPaint(Color.red);
gbi.fillRect(0, 0, 40, 40);
gbi.setComposite(ac);
gbi.setPaint(Color.green);
gbi.fillRect(5, 5, 40, 40);
g2d.drawImage(buffImg, 20, 20, null);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Composition");
frame.add(new Main());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 120);
frame.setVisible(true);
}
}
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