import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;

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

public class Test extends JPanel {
    double D = 70.9;
    double xT = 0.3;
    double yT = 0;
    int SIZE = 200;

    public Test() {
        this.setPreferredSize(new Dimension(SIZE, SIZE));
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setColor(Color.red);
        g2.fill(new Rectangle2D.Double(0,   0,   SIZE, SIZE));
        g2.setColor(Color.white);
        g2.fill(new Rectangle2D.Double(xT,   yT,   D, D));
        g2.fill(new Rectangle2D.Double(xT+D, yT+D, D, D));
        g2.setColor(Color.black);
        g2.fill(new Rectangle2D.Double(xT,   yT+D, D, D));
        g2.fill(new Rectangle2D.Double(xT+D, yT,   D, D));
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        JPanel panel = new Test();

        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}