PBO 2

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

/**
 * Write a description of class LampuLalin here.
 * Sebagai media menggambar lampu lalu lintas
 * @author Thomas Felix
 * @version 19 Oktober 2020
 */

public class LampuLalin extends JPanel
{
    Color on;
    int radius = 50;
    int border = 20;

    boolean isOn;

    LampuLalin(Color color)
    {
        on = color;
        isOn = false;
    }

    public void turnOn(boolean b)
    {
        isOn = b;
        repaint();
    }

    public Dimension getPreferredSize()
    {
        int size = (radius * 2 + border * 2);
        return new Dimension(size, size);
    }

    protected void paintComponent(Graphics graphics)
    {
        graphics.setColor(Color.black);
        graphics.fillRect(0, 0, getWidth(), getHeight());

        if (isOn)
        {
            graphics.setColor(on);
        }

        else
        {
            graphics.setColor(on.darker().darker().darker());
        }

        graphics.fillOval(border, border, radius * 2, radius * 2);
    }
}