Tugas 6 (Implemen GUI)

1. Image Viewer

Kelas Image Viewer

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import javax.io.File;
public class ImageViewer
{
    // instance variables - replace the example below with your own
    private static final String VERSION = "Version 1.0";
    private static JFileChooser fileChooser = new JFileChooser (System.getPropert("user.dir"));
 
    private JFrame frame;
    private ImagePanel imagePanel;
    private JLabel filenameLabel;
    private JLabel statusLabel;
    private OFImage currentImage;
 
    public ImageViewer()
    {
        currentImage = null;
        makeFrame();
    }
 
 
private void openFile()
{
    int returnVal= fileChooser.showOpenDialog(frame);
 
    if(returnVal != JFileChooser.getSelectedFile())
    {
        return;
    }
 
    File selectedFile = fileChooser.getSelectedFile();
    currentImage = ImagefileManager.loadImage(selectedFile);
 
    if(currentImage == null)
    {
        JOptionPane.showMessageDialog(frame,"The file was not in a recognized image file format.",
        "Image Load Error", JOptionPane.ERROR_MESSAGE);
        return;
    }
 
    imagePanel.setImage(currentImage);
    showFilename(selectedFile.getPath());
    showStatus("File loaded.");
    frame.pack();
}

private void close()
{
    currentImage = null;
    imagePanel.clearImage();
    showFilename(null);
}

private void quit ()
{
    System.exit(0);
}

private void makeDarker()
{
    if(currentImage != NULL)
    {
        currentImage.darker();
        frame.repaint();
        showStatus("Applied: darker");
    }
 
    else
    {
        showStatus("No image loaded.");
    }
}
 
private void makeLighter()
    {
        if(currentImage != null)
        {
            currentImage.lighter();
            frame.repaint();
            showStatus("Applied: lighter");
        }
     
        else
        {
            showStatus("No image loaded.");
        }
    }

private void threshold()
{
    if(currentImage != null)
    {
        currentImagethreshold();
        frame.repaint();
        showStatus("Applied: threshold");
    }
 
    else
    {
        showStatus("No image loaded.");
    }
}

private void showAbout()
{
    JOptionPane.showMessageDialog(frame, "ImageViewer\n" + VERSION, "About ImageViewer", JOptionPane.INFORMATION_MESSAGE);
}

private void showfilename(String filename)
{
    if(filename == null)
    {
        filename.Label.setText("No File Displayed.");
    }
 
    else
    {
        filenameLabel.setText("File: " + filename);
    }
}

private void showStatus(String text)
{
    statusLabel.setText(text);
}

private void makeFrame()
{
    frame = new JFrame("ImageViewer");
    makeMenuBar(frame);
 
    Container contentPane = frame.getContentPane();
 
    contentPane.setLayout(new BorderLayout(6,  6));
 
    contentPane.add(filenameLabel, BorderLayout.NORTH);
 
    imagePanel = new ImagePanel();
    contentPane.add(statusLabel, BorderLayout.CENTER);
 
    statusLabel = new JLabel(VERSION);
    contentPane.add(imagePanel, BorderLayout.SOUTH);
 
    showFilename(null);
    frame.pack();
 
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setLocation(d.width/2 = frame.getWidth()/2, d.height/2 - frame.getHeight()/2);
    frame.setVisible(true);
}

private void makeMenuBar(JFrame frame)
{
    final int SHORTCUT_MASK = Toolkit.getDefaultToolkit().getMenuShortcutKeyMaks();
 
    JMenuBar menubar = new JMenuBar();
    frame.setJMenuBar(menubar);
 
    JMenu menu;
    JMenuItem item;
 
    menu = new JMenu("File");
    menubar.add(menu);
 
    item = new JMenuItem("Open");
    item.setAccelerator(KeyStroke.getStroke(KeyEvent,VK_O, SHORTCUT_MASK));
    item.addActionListener(new ActionListener() | public void actionPerformed(ActionEvent e) | openFile(); | |);
 
    menu.add(item);
 
    item = new JMenuItem("Close");
    item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, SHORTCUT_MASK));
    item.addActionListener(new ActionListener() | public void actionPerformed(ActionEvent e) | close(); | |);
    menu.add(item);
    menu.addSeparator();
 
    item = new JMenuItem("Quit");
    item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, SHORTCUT_MASK));
    item.addActionListener(new ActionListener() | public void actionPerformed(ActionEvent e) | quit(); | |);
 
    menu.add(item);
 
    menu = new JMenu("Filter");
    menubar.add(menu);
 
    item = new JMenuItem("Darker");
    item.addActionListener(new ActionListener() | public void actionPerformed(ActionEvent e) | makeDarker(); | |);
    menu.add(item);
 
    item = new JMenuUtem("Lighter");
    item.addActionListener(new ActionListener() | public void actionPerformed(ActionEvent e) | makeLighter(); | |);
    menu.add(item);
 
    item = new JMenuItem("Threshold");
    item.addActionListener(new ActionListener() | public void actionPerformed(ActionEvent e) | threshold(); | |);
    menu.add(item);
 
    menu = new JMenu("Help");
    menubar.add(menu);
 
    item = new JMenuItem("About ImageViewer...");
    item.addActionListener(new ActionListener() | public void actionPerformed(ActionEvent e) | showAbout(); | |);
    menu.add(item);
    }
}

Kelas Image Panel

Kelas Image File Manager

Kelas OF Image

2. Implementasi Login

Kelas Login

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class login
{
    String Username = "james 3302";
    String Password = "pass";
    String msg = " ";
   
    public static void main(String[] args)
    {
        login gui = new login();
        gui.go();
    }
   
    public  void go ()
    {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        JLabel lblUsername = new JLabel("Username:");
        JLabel lblPassword = new JLabel("Password:");
        JTextField txtUsername = new JTextField(20);
        JTextField txtPassword = new JTextField(20);
        JButton btnLogin = new JButton ("Login");
        btnLogin.addActionListener (new LoginListener());
        JButton btnCancel = new JButton("Cancel");
        btnCancel.addActionListener(new CancelListener());
        panel.add(lblUsername);
        panel.add(txtUsername);
        panel.add(lblPassword);
        panel.add(txtPassword);
        frame.getContentPane().add(BorderLayout.CENTER,panel);
        frame.setSize(300,300);
        frame.setVisible(true);
    }
}

Kelas Login Listener

public class LoginListener implements ActionListener
    {
        public void actionPerformed(ActionEvent event)
    {
        if(Username.equals(txtUsername.getText()))
        {
            if(Password.equals(txtPassword.getText()))
            {
                msg = "Login Granted!";
            }
            else
            {
                msg = "Login Denied";
            }
            JOptionPane.showMessageDialog(null,msg);
        }
    }
   
   
}

Kelas Cancel Listener

public class CancelListener implements ActionListener
    {
        public void actionPerformed(ActionEvent event)
        {
            txtUsername.setText = " ";
            txtPassword.setText = "";
            txtUsername.requestFocus();
        }
    }