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import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JFrame {
public MainClass() {
getContentPane().add(new DrawingCanvas());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500, 500);
setVisible(true);
}
public static void main(String arg[]) {
new MainClass();
}
}
class DrawingCanvas extends JPanel {
DrawingCanvas() {
setSize(300, 300);
setBackground(Color.white);
}
public void paint(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
Graphics2D g2 = (Graphics2D) g;
int w = getSize().width;
int h = getSize().height;
Ellipse2D e = new Ellipse2D.Float(w / 4.0f, h / 4.0f, w / 2.0f, h / 2.0f);
g2.setClip(e);
g2.setColor(Color.red);
g2.fillRect(0, 0, w, h);
}
}
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