Traffic Light

     Disini saya membuat sebuah program yang dapat mempresentasikan sebuah traffic light atau biasa disebut lampu lalu lintas. Traffic light tersebut dapat bekerja layaknya seperti traffic light pada umumnya. Untuk membuat traffic light tersebut, program ini dibuat timer internal yang berfungsi untuk salah satu rambu yang menyala terang diantara ke tiga warna tersebut. Waktu yang dibutuhkan untuk satu rambu adalah 15 detik dan lampu yang menyala tersebut dimulai dari warna merah setelah itu ke warna hijau dan yang terakhir kuning. 

1. Abstraksi

    

2. Diagram

Diagram Class

Diagram Objek

3. Source Code

SignalPane : 

	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 getPreferredSize(){
	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 );
	}
	}

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DigitPane : 

	import java.awt.*;
	import javax.swing.*;
	public class DigitPane extends JPanel {
	private int second;
	public Dimension getPreferredSize(){
	FontMetrics fm = getFontMetrics(getFont());
	return new Dimension(fm.stringWidth("00"), fm.getHeight());
	}
	// function untuk mengubah nilai timer dan mengupdate tampilan
	public void setValue(int newVal){
	if (second != newVal) {
	second = newVal;
	repaint();
	}
	}
	public int getValue(){
	return second;
	}
	// function u/ menampilkan integer sebagai string
	private String pad(int value){
	return String.format("%02d", value);
	}
	protected void paintComponent(Graphics g){
	super.paintComponent(g);
	g.setFont(new Font("LCD", Font.PLAIN, 24));
	FontMetrics fm = getFontMetrics(g.getFont());
	String text = pad(getValue());
	int x = (getWidth() - fm.stringWidth(text)) / 2;
	int y = ((getHeight()- fm.getHeight()) / 2) + fm.getAscent();
	g.drawString(text, x, y);
	}
	}

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TrafficLightPane :

 

	import java.awt.*;
	import javax.swing.*;
	import java.awt.event.*;
	public class TrafficLightPane extends JPanel {
	int tick = 1;
	int duration = 15;
	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 u/ mengubah integer menjadi boolean
	private boolean changeToBool(int state){
	if (state % 3 > 0 ){
	return false;
	} else {
	return true;
	}
	}
	// function untuk mengubah state (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;
	}
	}

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AppFrame :

	import java.awt.*;
	import javax.swing.*;
	public class AppFrame extends JFrame{
	public static void main(String[] args) {
	new AppFrame(15);
	}
	public AppFrame (int duration){
	EventQueue.invokeLater(new Runnable() {
	public void run() {
	try {
	UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
	} catch (ClassNotFoundException ex) {
	} catch (InstantiationException ex) {
	} catch (IllegalAccessException ex) {
	} catch (UnsupportedLookAndFeelException ex) {
	}
	JFrame frame = new JFrame("Traffic Light");
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.setLayout(new BorderLayout(1,1));
	frame.add(new TrafficLightPane(duration));
	frame.pack();
	frame.setLocationRelativeTo(null);
	frame.setVisible(true);
	}
	});
	}
	}

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Output :