TransformDemo.java Source code

Introduction

Here is the source code for TransformDemo.java

Source

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.TexturePaint;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class TransformDemo extends JPanel {
    public void init() {
        setBackground(Color.white);
    }

    public void paint(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        Rectangle rect = new Rectangle(5, 5, 200, 200);

        int w = getSize().width;
        int h = getSize().height;

        AffineTransform saveXform = g2.getTransform();
        AffineTransform toCenterAt = new AffineTransform();
        toCenterAt.translate(w / 2 - (rect.width / 2), h / 2 - (rect.height / 2));
        g2.transform(toCenterAt);

        g2.fill(rect);

        g2.transform(saveXform);
    }

    public static void main(String s[]) {
        JFrame f = new JFrame();
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        TransformDemo p = new TransformDemo();
        f.getContentPane().add("Center", p);
        p.init();
        f.pack();
        f.setSize(new Dimension(300, 300));
        f.show();
    }

}