APL/DEV 3.2/TP03/Luminance/Luminance.java

import javax.swing.JFrame;
import java.awt.*;
/**
 * Luminance
 */
public class Luminance {

    public static void main(String[] args) {
        JFrame f = new JFrame();

        LumPanel lm = new LumPanel();
        lm.setLocation(0, 0);
        lm.setSize(480, 100);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setLocation(200, 200);
        f.setSize(400, 100);
        f.setResizable(false);
        f.add(lm);
        f.setLayout(null);
        f.setVisible(true);

        lm.addMouseListener(new LumListener());

        while (true) {
            Point p = MouseInfo.getPointerInfo().getLocation();
            lm.setMCoords(p.x - lm.getLocationOnScreen().x, p.y - lm.getLocationOnScreen().y);
        }
    }
}