PBO - Tugas 2 - Aplikasi Traffic Light

 

Tugas 2 PBO - Aplikasi Traffic Light

Kevin Ashil Faadilah

05111740000178

Deskripsi

Sebuah traffic light terdiri dari 3 lampu rambu (berwarna merah, kuning, hijau), dan sebuah timer internal. Hanya ada satu rambu yang bisa menyala pada setiap waktu dan rambu yang menyala akan berubah setiap x detik. Pergantian diatur oleh timer internal dari traffic light, saat timer mencapai nol rambu akan berubah dan timer kembali di set seperti semula.

Class Diagram

Dekonstruksi Module/Class yang dibutuhkan

Maka, untuk membangun aplikasi sesuai deskripsi diatas kita memerlukan beberapa modul:

1. Modul GUI (java.awt dan java.swing)
2. Timer (java.swing.Timer)
3. Signal untuk rambu
4. Panel untuk menunjukkan countdown dari timer    
   

 Object Diagram

Overview Class di BlueJ

Implementasi (Source Code)

AppFrame.java 

 /**  
  * Class untuk menampilkan WindowFrame aplikasi  
  */  
 import java.awt.*;  
 import javax.swing.*;  
 public class AppFrame extends JFrame{  
   public static void main(String[] args) {  
     new AppFrame(10);  
   }  
   public AppFrame (int duration){  
     EventQueue.invokeLater(new Runnable() {  
       @Override  
       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);  
       }  
     });  
   }  
 }   

 

TrafficLightPane.java

 /**  
  * Class untuk menampilkan traffic light  
  */  
 import java.awt.*;  
 import javax.swing.*;  
 import java.awt.event.*;  
 public class TrafficLightPane extends JPanel {  
   int tick = 1;  
   int duration = 10;  
   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(){  
       @Override  
       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;  
   }  
 }   

 

DigitPane.java

 /**  
  * Class untuk menampilkan timer  
  */  
 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);  
   }      
 }    

 

SignalPane.java

 /**  
  * Class untuk menggambar Lampu Traffic Light  
  */  
 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 );  
   }  
 }  

Hasil Program