My Blog

Compositing.java


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 Compositing extends JPanel {

int rules[] = {
AlphaComposite.DST,
AlphaComposite.DST_ATOP,
AlphaComposite.DST_OUT,
AlphaComposite.SRC,
AlphaComposite.SRC_ATOP,
AlphaComposite.SRC_OUT,
};


public void paint(Graphics g) {

Graphics2D g2d = (Graphics2D) g;

for (int x=20, y=20, i=0; i < rules.length; x+=60, i++) {

AlphaComposite ac = AlphaComposite.getInstance(rules[i], 0.8f);

BufferedImage buffImg = new BufferedImage(60, 60,
BufferedImage.TYPE_INT_ARGB);
Graphics2D gbi = buffImg.createGraphics();

gbi.setPaint(Color.blue);
gbi.fillRect(0, 0, 40, 40);
gbi.setComposite(ac);

gbi.setPaint(Color.green);
gbi.fillRect(5, 5, 40, 40);

g2d.drawImage(buffImg, x, y, null);
}
}

public static void main(String[] args) {

JFrame frame = new JFrame("Composition");
frame.add(new Compositing());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 120);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}