Image Viewer dengan Filter
Kali ini saya akan memposting mengenai image viewer dengan menggunakan java, dengan fitur filter yang merubah foto menjadi lebih gelap dan sebagainya.
Filter yang diterapkan ada 4, yakni,
1. Darker
2. Lighter
3. Threshold
4. Fisheye
Untuk aplikasi ini dibutuhkan 9 kelas dengan 1 kelas abstract
1. OFimage
2. ImagePanel
3. ImageFileManager
4. ImageViewer
5. Filter (Abstract)
6. DarkerFilter
7. LighterFilter
8. ThresholdFilter
9. FishEyeFilter
Berikut kelasnya
1. OFImage
import java.awt.*; import java.awt.image.*; import javax.swing.*; /** * OFImage is a class that defines an image in OF (Objects First) format. * */ public class OFImage extends BufferedImage{ /**Create an OFImage copied from a BufferedImage. * @param image The image to copy.*/ public OFImage(BufferedImage image){ super(image.getColorModel(), image.copyData(null), image.isAlphaPremultiplied(), null); } /**Create an OFImage with specified size and unspecified content. * @param width The width of the image. * @param height The height of the image.*/ public OFImage(int width, int height){ super(width, height, TYPE_INT_RGB); } /**Set a given pixel of this image to a specified color. The * color is represented as an (r,g,b) value. * @param x The x position of the pixel. * @param y The y position of the pixel. * @param col The color of the pixel.*/ public void setPixel(int x, int y, Color col){ int pixel = col.getRGB(); setRGB(x, y, pixel); } /**Get the color value at a specified pixel position. * @param x The x position of the pixel. * @param y The y position of the pixel. * @return The color of the pixel at the given position.*/ public Color getPixel(int x, int y){ int pixel = getRGB(x, y); return new Color(pixel); } }
2.ImagePanel
import java.awt.*; import javax.swing.*; import java.awt.image.*; /** * An ImagePanel is a Swing component that can display an OFImage. * It is constructed as a subclass of JComponent with the added functionality * of setting an OFImage that will be displayed on the surface of this * component. * */ public class ImagePanel extends JComponent{ // The current width and height of this panel private int width, height; // An internal image buffer that is used for painting. For // actual display, this image buffer is then copied to screen. private OFImage panelImage; // Create a new, empty ImagePanel. public ImagePanel(){ width = 360; // arbitrary size for empty panel height = 240; panelImage = null; } /**Set the image that this panel should show. *@param image The image to be displayed.*/ public void setImage(OFImage image){ if(image != null){ width = image.getWidth(); height = image.getHeight(); panelImage = image; repaint(); } } // Clear the image on this panel. public void clearImage(){ Graphics imageGraphics = panelImage.getGraphics(); imageGraphics.setColor(Color.LIGHT_GRAY); imageGraphics.fillRect(0, 0, width, height); repaint(); } // The following methods are redefinitions of methods // inherited from superclasses. /**Tell the layout manager how big we would like to be. * (This method gets called by layout managers for placing * the components.) * * @return The preferred dimension for this component.*/ public Dimension getPreferredSize(){ return new Dimension(width, height); } /**This component needs to be redisplayed. Copy the internal image * to screen. (This method gets called by the Swing screen painter * every time it want this component displayed.) * * @param g The graphics context that can be used to draw on this component.*/ 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); } } }
3.ImageFileManager
import java.awt.image.*; import javax.imageio.*; import java.io.*; /** * ImageFileManager is a small utility class with static methods to load * and save images. * The files on disk can be in JPG or PNG image format. For files written * by this class, the format is determined by the constant IMAGE_FORMAT. * */ public class ImageFileManager{ // A constant for the image format that this writer uses for writing. // Available formats are "jpg" and "png". private static final String IMAGE_FORMAT = "jpg"; /**Read an image file from disk and return it as an image. This method * can read JPG and PNG file formats. In case of any problem (e.g the file * does not exist, is in an undecodable format, or any other read error) * this method returns null. * * @param imageFile The image file to be loaded. * @return The image object or null is it could not be read.*/ public static OFImage loadImage(File imageFile){ try{ BufferedImage image = ImageIO.read(imageFile); if(image == null || (image.getWidth(null) < 0)){ // we could not load the image - probably invalid file format return null; } return new OFImage(image); } catch(IOException exc){ return null; } } /**Write an image file to disk. The file format is JPG. In case of any * problem the method just silently returns. * * @param image The image to be saved. * @param file The file to save to.*/ public static void saveImage(OFImage image, File file){ try{ ImageIO.write(image, IMAGE_FORMAT, file); } catch(IOException exc){ return; } } }
4. Filter (Abstract)
/** * Filter is an abstract superclass for all image filters in this * application. Filters can be applied to OFImages by invoking the apply * method. * */ public abstract class Filter{ private String name; /** * Create a new filter with a given name. * @param name The name of the filter. */ public Filter(String name){ this.name = name; } /** * Return the name of this filter. * * @return The name of this filter. */ public String getName(){ return name; } /** * Apply this filter to an image. * * @param image The image to be changed by this filter. */ public abstract void apply(OFImage image); }
5. DarkerFilter
/** * An image filter to make the image a bit darker. * */ public class DarkerFilter extends Filter{ /**Constructor for objects of class DarkerFilter. * @param name The name of the filter.*/ public DarkerFilter(String name){ super(name); } /**Apply this filter to an image. * @param image The image to be changed by this filter.*/ public void apply(OFImage image){ int height = image.getHeight(); int width = image.getWidth(); for(int y = 0; y < height; y++){ for(int x = 0; x < width; x++){ image.setPixel(x, y, image.getPixel(x, y).darker()); } } } }
6. LighterFilter
/** * An image filter to make the image a bit lighter. * */ public class LighterFilter extends Filter{ // Constructor for objects of class LighterFilter. // @param name The name of the filter. public LighterFilter(String name){ super(name); } /**Apply this filter to an image. * @param image The image to be changed by this filter.*/ public void apply(OFImage image){ int height = image.getHeight(); int width = image.getWidth(); for(int y = 0; y < height; y++) { for(int x = 0; x < width; x++) { image.setPixel(x, y, image.getPixel(x, y).brighter()); } } } }
7. ThresholdFilter
import java.awt.Color; /** * An three-level gray-based threshold filter. * */ public class ThresholdFilter extends Filter{ // Constructor for objects of class ThresholdFilter. // @param name The name of the filter. public ThresholdFilter(String name){ super(name); } /**Apply this filter to an image. * @param image The image to be changed by this filter.*/ public void apply(OFImage image){ int height = image.getHeight(); int width = image.getWidth(); for(int y = 0; y < height; y++){ for(int x = 0; x < width; x++){ Color pixel = image.getPixel(x, y); int brightness = (pixel.getRed() + pixel.getBlue() + pixel.getGreen()) / 3; if(brightness <= 85){ image.setPixel(x, y, Color.BLACK); }else if(brightness <= 170){ image.setPixel(x, y, Color.GRAY); }else{ image.setPixel(x, y, Color.WHITE); } } } } }
8. FishEyeFilter
import java.awt.Color; /** * An image filter to create an effect similar to a fisheye camera lens. * (Works especially well on portraits.) * */ public class FishEyeFilter extends Filter{ // constants: private final static int SCALE = 20; // this defines the strenght of the filter private final static double TWO_PI = 2 * Math.PI; /**Constructor for objects of class LensFilter. * @param name The name of the filter.*/ public FishEyeFilter(String name){ super(name); } /**Apply this filter to an image. * @param image The image to be changed by this filter.*/ public void apply(OFImage image){ int height = image.getHeight(); int width = image.getWidth(); OFImage original = new OFImage(image); int[] xa = computeXArray(width); int[] ya = computeYArray(height); for(int y = 0; y < height; y++){ for(int x = 0; x < width; x++){ image.setPixel(x, y, original.getPixel(x + xa[x], y + ya[y])); } } } /**Compute and return an array of horizontal offsets for each pixel column. * These can then be applied as the horizontal offset for each pixel.*/ private int[] computeXArray(int width){ int[] xArray = new int[width]; for(int i=0; i < width; i++){ xArray[i] = (int)(Math.sin( ((double)i / width) * TWO_PI) * SCALE); } return xArray; } /**Compute and return an array of vertical offsets for each pixel row. * These can then be applied as the vertical offset for each pixel.*/ private int[] computeYArray(int height){ int[] yArray = new int[height]; for(int i=0; i < height; i++){ yArray[i] = (int)(Math.sin( ((double)i / height) * TWO_PI) * SCALE); } return yArray; } }
9. ImageViewer
import java.awt.*; import java.awt.event.*; import java.awt.image.*; import javax.swing.*; import javax.swing.border.*; import java.io.File; import java.util.List; import java.util.ArrayList; import java.util.Iterator; /** * Write a description of class ImageViewer here. * */ public class ImageViewer { // static fields: private static final String VERSION = "Version 3.0"; private static JFileChooser fileChooser = new JFileChooser(System.getProperty("user.dir")); // fields: private JFrame frame; private ImagePanel imagePanel; private JLabel filenameLabel; private JLabel statusLabel; private JButton smallerButton; private JButton largerButton; private OFImage currentImage; private List<Filter> filters; /** * Create an ImageViewer and display its GUI on screen. */ public ImageViewer() { currentImage = null; filters = createFilters(); makeFrame(); } // ---- implementation of menu functions ---- /** * Open function: open a file chooser to select a new image file, * and then display the chosen image. */ private void openFile() { int returnVal = fileChooser.showOpenDialog(frame); if(returnVal != JFileChooser.APPROVE_OPTION) { return; // cancelled } File selectedFile = fileChooser.getSelectedFile(); currentImage = ImageFileManager.loadImage(selectedFile); if(currentImage == null) { // image file was not a valid image JOptionPane.showMessageDialog(frame, "The file was not in a recognized image file format.", "Image Load Error", JOptionPane.ERROR_MESSAGE); return; } imagePanel.setImage(currentImage); setButtonsEnabled(true); showFilename(selectedFile.getPath()); showStatus("File loaded."); frame.pack(); } /** * Close function: close the current image. */ private void close() { currentImage = null; imagePanel.clearImage(); showFilename(null); setButtonsEnabled(false); } /** * Save As function: save the current image to a file. */ private void saveAs() { if(currentImage != null) { int returnVal = fileChooser.showSaveDialog(frame); if(returnVal != JFileChooser.APPROVE_OPTION) { return; // cancelled } File selectedFile = fileChooser.getSelectedFile(); ImageFileManager.saveImage(currentImage, selectedFile); showFilename(selectedFile.getPath()); } } /** * Quit function: quit the application. */ private void quit() { System.exit(0); } /** * Apply a given filter to the current image. * * @param filter The filter object to be applied. */ private void applyFilter(Filter filter) { if(currentImage != null) { filter.apply(currentImage); frame.repaint(); showStatus("Applied: " + filter.getName()); } else { showStatus("No image loaded."); } } /** * 'About' function: show the 'about' box. */ private void showAbout() { JOptionPane.showMessageDialog(frame, "ImageViewer\n" + VERSION, "About ImageViewer", JOptionPane.INFORMATION_MESSAGE); } /** * Make the current picture larger. */ private void makeLarger() { if(currentImage != null) { // create new image with double size int width = currentImage.getWidth(); int height = currentImage.getHeight(); OFImage newImage = new OFImage(width * 2, height * 2); // copy pixel data into new image for(int y = 0; y < height; y++) { for(int x = 0; x < width; x++) { Color col = currentImage.getPixel(x, y); newImage.setPixel(x * 2, y * 2, col); newImage.setPixel(x * 2 + 1, y * 2, col); newImage.setPixel(x * 2, y * 2 + 1, col); newImage.setPixel(x * 2+1, y * 2 + 1, col); } } currentImage = newImage; imagePanel.setImage(currentImage); frame.pack(); } } /** * Make the current picture smaller. */ private void makeSmaller() { if(currentImage != null) { // create new image with double size int width = currentImage.getWidth() / 2; int height = currentImage.getHeight() / 2; OFImage newImage = new OFImage(width, height); // copy pixel data into new image for(int y = 0; y < height; y++) { for(int x = 0; x < width; x++) { newImage.setPixel(x, y, currentImage.getPixel(x * 2, y * 2)); } } currentImage = newImage; imagePanel.setImage(currentImage); frame.pack(); } } // ---- support methods ---- /** * Show the file name of the current image in the fils display label. * 'null' may be used as a parameter if no file is currently loaded. * * @param filename The file name to be displayed, or null for 'no file'. */ private void showFilename(String filename) { if(filename == null) { filenameLabel.setText("No file displayed."); } else { filenameLabel.setText("File: " + filename); } } /** * Show a message in the status bar at the bottom of the screen. * @param text The message to be displayed. */ private void showStatus(String text) { statusLabel.setText(text); } /** * Enable or disable all toolbar buttons. * * @param status 'true' to enable the buttons, 'false' to disable. */ private void setButtonsEnabled(boolean status) { smallerButton.setEnabled(status); largerButton.setEnabled(status); } /** * Create a list with all the known filters. * @return The list of filters. */ private List<Filter> createFilters() { List<Filter> filterList = new ArrayList<Filter>(); filterList.add(new DarkerFilter("Darker")); filterList.add(new LighterFilter("Lighter")); filterList.add(new ThresholdFilter("Threshold")); filterList.add(new FishEyeFilter("Fish Eye")); return filterList; } // ---- swing stuff to build the frame and all its components ---- /** * Create the Swing frame and its content. */ private void makeFrame() { frame = new JFrame("ImageViewer"); JPanel contentPane = (JPanel)frame.getContentPane(); contentPane.setBorder(new EmptyBorder(6, 6, 6, 6)); makeMenuBar(frame); // Specify the layout manager with nice spacing contentPane.setLayout(new BorderLayout(6, 6)); // Create the image pane in the center imagePanel = new ImagePanel(); imagePanel.setBorder(new EtchedBorder()); contentPane.add(imagePanel, BorderLayout.CENTER); // Create two labels at top and bottom for the file name and status message filenameLabel = new JLabel(); contentPane.add(filenameLabel, BorderLayout.NORTH); statusLabel = new JLabel(VERSION); contentPane.add(statusLabel, BorderLayout.SOUTH); // Create the toolbar with the buttons JPanel toolbar = new JPanel(); toolbar.setLayout(new GridLayout(0, 1)); smallerButton = new JButton("Smaller"); smallerButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { makeSmaller(); } }); toolbar.add(smallerButton); largerButton = new JButton("Larger"); largerButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { makeLarger(); } }); toolbar.add(largerButton); // Add toolbar into panel with flow layout for spacing JPanel flow = new JPanel(); flow.add(toolbar); contentPane.add(flow, BorderLayout.WEST); // building is done - arrange the components showFilename(null); setButtonsEnabled(false); frame.pack(); // place the frame at the center of the screen and show Dimension d = Toolkit.getDefaultToolkit().getScreenSize(); frame.setLocation(d.width/2 - frame.getWidth()/2, d.height/2 - frame.getHeight()/2); frame.setVisible(true); } /** * Create the main frame's menu bar. * * @param frame The frame that the menu bar should be added to. */ private void makeMenuBar(JFrame frame) { final int SHORTCUT_MASK = Toolkit.getDefaultToolkit().getMenuShortcutKeyMask(); JMenuBar menubar = new JMenuBar(); frame.setJMenuBar(menubar); JMenu menu; JMenuItem item; // create the File menu menu = new JMenu("File"); menubar.add(menu); item = new JMenuItem("Open..."); item.setAccelerator(KeyStroke.getKeyStroke(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("Save As..."); item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, SHORTCUT_MASK)); item.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { saveAs(); } }); 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); // create the Filter menu menu = new JMenu("Filter"); menubar.add(menu); for(final Filter filter : filters) { item = new JMenuItem(filter.getName()); item.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { applyFilter(filter); } }); menu.add(item); } // create the Help menu 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); } }
Uji Coba Program
1. Create New Image Viewer
2. Program yang keluar
3. Load Gambar
4. Gambar Smaller
5. Gambar Larger
6. Darker Filter
7. Lighter Filter
8. Threshold Filter
9. FishEye Filter
Sekian dan terimakasih
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