TrafficLightPane Tugas 2

/**
 * Class untuk menampilkan lampu lalu lintas
 */

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class TrafficLightPane extends JPanel
{
    int tick  = 1;
    int duration = 60;
    int state = 0;
    SignalPane green = new SignalPane(Color.green);
    SignalPane yellow = new SignalPane(Color.yellow);
    SignalPane red = new SignalPane(Color.red);
    DigitPane timerDigit = new DigitPane();

    public TrafficLightPane (int s)
    {
        duration = s;
        setLayout(new GridLayout(4, 1));
        green.turnOn(false);
        yellow.turnOn(false);
        red.turnOn(true);
        timerDigit.setValue(duration);
        add(red);
        add(yellow);
        add(green);
        add(timerDigit);
        Timer timer = new Timer(1000, new ActionListener() {
            public void actionPerformed(ActionEvent e)
            {
                int timeRemaining = duration - tick;

                if (timeRemaining <= 0)
                {
                    tick = 0;
                    state++;
                    changeSignalState(state);
                }

            timerDigit.setValue(duration - tick);
            tick++;
            }
        });
        timer.setRepeats(true);
        timer.setCoalesce(true);
        timer.start();
    }

    //function untuk mengubah integer menjadi boolean
    private boolean changeToBool(int state)
    {
        if (state % 3 > 0)
        {
            return false;
        }
        else
        {
            return true;
        }
    }

    //function untuk satet (on/off) dari object Signal
    private void changeSignalState(int state)
    {
        green.turnOn(changeToBool(state + 2));
        yellow.turnOn(changeToBool(state + 1));
        red.turnOn(changeToBool(state));
    }

    public void setDuration(int s)
    {
        duration = s;
    }
}