1. Class OFImage (untuk mengubah gambar)
import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
public class OFImage extends BufferedImage {
public OFImage(BufferedImage image) {
super(image.getColorModel(), image.copyData(null), image.isAlphaPremultiplied(), null);
}
//Membuat OFImage dg ukuran tertentu tanpa isi
public OFImage(int width, int height) {
super(width, height, TYPE_INT_RGB);
}
//Menentukan warna suatu pixel dlm gambar
public void setPixel(int x, int y, Color c) {
int pixel = c.getRGB();
setRGB(x,y,pixel);
}
//Mendapatkan warna dari suatu pixel
public Color getPixel(int x,int y) {
int pixel = getRGB(x,y);
return new Color(pixel);
}
//Menggelapkan gambar
public void darker() {
int height = getHeight();
int width = getWidth();
for (int y=0; y<height; y++) {
for(int x=0; x<width; x++) {
setPixel(x,y,getPixel(x,y).darker());
}
}
}
//Menerangkan gambar
public void lighter() {
int height = getHeight();
int width = getWidth();
for (int y=0; y<height; y++) {
for(int x=0; x<width; x++) {
setPixel(x,y,getPixel(x,y).brighter());
}
}
}
//Monokrom
public void threshold() {
int height = getHeight();
int width = getWidth();
for (int y=0; y<height; y++) {
for(int x=0; x<width; x++) {
Color pixel = getPixel(x,y);
int brightness = (pixel.getRed() + pixel.getBlue() + pixel.getGreen());
if(brightness <= 85) {
setPixel(x,y,Color.BLACK);
}
else if(brightness <= 170) {
setPixel(x,y,Color.GRAY);
}
else {
setPixel(x,y,Color.WHITE);
}
}
}
}
}
import java.awt.*;
import javax.swing.*;
import java.awt.image.*;
//Komponen swing yang dapat menampilkan OFImage
public class ImagePanel extends JComponent {
private int width, height;
//gambar yang ditampilkan
private OFImage panelImage;
public ImagePanel() {
width = 360;
height = 240;
panelImage = null;
}
public void setImage(OFImage image) {
if (image!=null) {
width = image.getWidth();
height = image.getHeight();
panelImage = image;
repaint();
}
}
public void clearImage() {
Graphics imageGraphics = panelImage.getGraphics();
imageGraphics.setColor(Color.LIGHT_GRAY);
imageGraphics.fillRect(0, 0, width, height);
repaint();
}
public Dimension getPreferredSize() {
return new Dimension(width, height);
}
public void paintComponent(Graphics g) {
Dimension size = getSize();
g.clearRect(0, 0, size.width, size.height);
if(panelImage != null) {
g.drawImage(panelImage, 0, 0, null);
}
}
}
import java.awt.image.*;
import javax.imageio.*;
import java.io.*;
//utility class untuk load dan save image
public class ImageFileManager {
private static final String IMAGE_FORMAT = "jpg";
//Read file image dari disk dan mereturn sbg image
//Jika terdapat masalah maka return null
//(file tidak ditemukan, tidak dapat di decode, atau read error)
public static OFImage loadImage(File imageFile) {
try {
BufferedImage image = ImageIO.read(imageFile);
if(image == null || (image.getWidth(null) < 0) ) {
return null;
}
return new OFImage(image);
}
catch(IOException exc) {
return null;
}
}
//Write file image ke disk. Format jpg
public static void saveImage(OFImage image, File file) {
try {
ImageIO.write(image, IMAGE_FORMAT, file);
}
catch(IOException exc) {
return;
}
}
}
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.io.File;
public class ImageViewer {
private JFrame frame;
private ImagePanel imagePanel;
private JLabel filenameLabel;
private JLabel statusLabel;
private OFImage currentImage;
private static final String VERSION = "Version 1.0";
private static JFileChooser fileChooser = new JFileChooser(System.getProperty("user.dir"));
public ImageViewer() {
currentImage = null;
makeFrame();
}
private void makeFrame() {
frame = new JFrame("ImageViewer");
makeMenuBar(frame);
Container contentPane = frame.getContentPane();
contentPane.setLayout(new BorderLayout(6,6));
filenameLabel = new JLabel();
contentPane.add(filenameLabel, BorderLayout.NORTH);
imagePanel = new ImagePanel();
contentPane.add(imagePanel, BorderLayout.CENTER);
statusLabel = new JLabel(VERSION);
contentPane.add(statusLabel, 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 f) {
final int SHORTCUT_MASK = Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();
JMenuBar menubar = new JMenuBar();
f.setJMenuBar(menubar);
JMenu menu;
JMenuItem menuitem;
menu = new JMenu("File");
menubar.add(menu);
menuitem = new JMenuItem("Open");
menuitem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_0, SHORTCUT_MASK));
menuitem.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
openFile();
}
}
);
menu.add(menuitem);
menuitem = new JMenuItem("Close");
menuitem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_0, SHORTCUT_MASK));
menuitem.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
close();
}
}
);
menu.add(menuitem);
menu.addSeparator();
menuitem = new JMenuItem("Quit");
menuitem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_0, SHORTCUT_MASK));
menuitem.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
quit();
}
}
);
menu.add(menuitem);
menu = new JMenu ("Filter");
menubar.add(menu);
menuitem = new JMenuItem("Darker");
menuitem.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
makeDarker();
}
}
);
menu.add(menuitem);
menuitem = new JMenuItem("Lighter");
menuitem.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
makeLighter();
}
}
);
menu.add(menuitem);
menuitem = new JMenuItem("Threshold");
menuitem.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
threshold();
}
}
);
menu.add(menuitem);
menu = new JMenu("Help");
menubar.add(menu);
menuitem = new JMenuItem("About ImageViewer...");
menuitem.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
showAbout();
}
}
);
menu.add(menuitem);
}
private void openFile() {
int returnVal = fileChooser.showOpenDialog(frame);
if (returnVal != JFileChooser.APPROVE_OPTION) {
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("Image Darkened.");
}
else {
showStatus("No Image Loaded.");
}
}
private void makeLighter() {
if(currentImage != null) {
currentImage.lighter();
frame.repaint();
showStatus("Image Brightened.");
}
else {
showStatus("No Image Loaded.");
}
}
private void threshold() {
if(currentImage != null) {
currentImage.threshold();
frame.repaint();
showStatus("Applied Threshold");
}
else {
showStatus("No Image Loaded.");
}
}
private void showAbout() {
JOptionPane.showMessageDialog(frame, "ImageViewer\n" + VERSION, "About Image Viewer", JOptionPane.INFORMATION_MESSAGE);
}
private void showFilename(String filename) {
if(filename == null) {
filenameLabel.setText("No File loaded.");
}
else {
filenameLabel.setText("File: " + filename);
}
}
private void showStatus(String text) {
statusLabel.setText(text);
}
public static void main(String[] args) {
ImageViewer img = new ImageViewer();
}
}
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