SignalPane Tugas 2

/**
 * Class untuk menggambar lampu lalu lintas
 */

import java.awt.*;
import javax.swing.*;
class SignalPane extends JPanel
{
    Color on;
    int radius = 50;
    int border = 10;
    boolean isOn;

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

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

    public Dimension getPrefereedSize()
    {
        int size = (radius+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, 2*radius, 2*radius);
    }
}