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5
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/DarkerFilter.ctxt Executable file
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#BlueJ class context
comment0.params=name
comment0.target=DarkerFilter(java.lang.String)
comment0.text=\n\ Constructor\ for\ objects\ of\ class\ DarkerFilter.\n\ @param\ name\ The\ name\ of\ the\ filter.\n
numComments=1

33
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/DarkerFilter.java Executable file
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/**
* An image filter to make the image a bit darker.
*
* @author Michael Kölling and David J. Barnes.
* @version 1.0
*/
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());
}
}
}
}

8
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/Filter.ctxt Executable file
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#BlueJ class context
comment0.params=name
comment0.target=Filter(java.lang.String)
comment0.text=\n\ Create\ a\ new\ filter\ with\ a\ given\ name.\n\ @param\ name\ The\ name\ of\ the\ filter.\n
comment1.params=
comment1.target=java.lang.String\ getName()
comment1.text=\n\ Return\ the\ name\ of\ this\ filter.\n\ \n\ @return\ \ The\ name\ of\ this\ filter.\n
numComments=2

38
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/Filter.java Executable file
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/**
* Filter is an abstract superclass for all image filters in this
* application. Filters can be applied to OFImages by invoking the apply
* method.
*
* @author Michael Kölling and David J. Barnes.
* @version 1.0
*/
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);
}

11
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/FishEyeFilter.ctxt Executable file
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#BlueJ class context
comment0.params=name
comment0.target=FishEyeFilter(java.lang.String)
comment0.text=\n\ Constructor\ for\ objects\ of\ class\ LensFilter.\n\ @param\ name\ The\ name\ of\ the\ filter.\n
comment1.params=width
comment1.target=int[]\ computeXArray(int)
comment1.text=\n\ Compute\ and\ return\ an\ array\ of\ horizontal\ offsets\ for\ each\ pixel\ column.\n\ These\ can\ then\ be\ applied\ as\ the\ horizontal\ offset\ for\ each\ pixel.\n
comment2.params=height
comment2.target=int[]\ computeYArray(int)
comment2.text=\n\ Compute\ and\ return\ an\ array\ of\ vertical\ offsets\ for\ each\ pixel\ row.\n\ These\ can\ then\ be\ applied\ as\ the\ vertical\ offset\ for\ each\ pixel.\n
numComments=3

73
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/FishEyeFilter.java Executable file
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import java.awt.Color;
/**
* An image filter to create an effect similar to a fisheye camera lens.
* (Works especially well on portraits.)
*
* @author Michael Kölling and David J. Barnes.
* @version 1.0
*/
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;
}
}

2
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/ImageFileManager.ctxt Executable file
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#BlueJ class context
numComments=0

61
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/ImageFileManager.java Executable file
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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.
*
* @author Michael Kölling and David J. Barnes.
* @version 2.0
*/
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;
}
}
}

14
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/ImagePanel.ctxt Executable file
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#BlueJ class context
comment0.params=
comment0.target=ImagePanel()
comment0.text=\n\ Create\ a\ new,\ empty\ ImagePanel.\n
comment1.params=
comment1.target=void\ clearImage()
comment1.text=\n\ Clear\ the\ image\ on\ this\ panel.\n
comment2.params=
comment2.target=java.awt.Dimension\ getPreferredSize()
comment2.text=\n\ Tell\ the\ layout\ manager\ how\ big\ we\ would\ like\ to\ be.\n\ (This\ method\ gets\ called\ by\ layout\ managers\ for\ placing\n\ the\ components.)\n\ \n\ @return\ The\ preferred\ dimension\ for\ this\ component.\n
comment3.params=g
comment3.target=void\ paintComponent(java.awt.Graphics)
comment3.text=\n\ This\ component\ needs\ to\ be\ redisplayed.\ Copy\ the\ internal\ image\ \n\ to\ screen.\ (This\ method\ gets\ called\ by\ the\ Swing\ screen\ painter\ \n\ every\ time\ it\ want\ this\ component\ displayed.)\n\ \n\ @param\ g\ The\ graphics\ context\ that\ can\ be\ used\ to\ draw\ on\ this\ component.\n
numComments=4

89
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/ImagePanel.java Executable file
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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.
*
* @author Michael Kölling and David J. Barnes.
* @version 1.0
*/
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);
}
}
}

47
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/ImageViewer.ctxt Executable file
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#BlueJ class context
comment0.params=
comment0.target=ImageViewer()
comment0.text=\n\ Create\ an\ ImageViewer\ and\ display\ its\ GUI\ on\ screen.\n
comment1.params=
comment1.target=void\ openFile()
comment1.text=\n\ Open\ function\:\ open\ a\ file\ chooser\ to\ select\ a\ new\ image\ file,\n\ and\ then\ display\ the\ chosen\ image.\n
comment10.params=text
comment10.target=void\ showStatus(java.lang.String)
comment10.text=\n\ Show\ a\ message\ in\ the\ status\ bar\ at\ the\ bottom\ of\ the\ screen.\n\ @param\ text\ The\ message\ to\ be\ displayed.\n
comment11.params=status
comment11.target=void\ setButtonsEnabled(boolean)
comment11.text=\n\ Enable\ or\ disable\ all\ toolbar\ buttons.\n\ \n\ @param\ status\ \ 'true'\ to\ enable\ the\ buttons,\ 'false'\ to\ disable.\n
comment12.params=
comment12.target=java.util.List\ createFilters()
comment12.text=\n\ Create\ a\ list\ with\ all\ the\ known\ filters.\n\ @return\ The\ list\ of\ filters.\n
comment13.params=
comment13.target=void\ makeFrame()
comment13.text=\n\ Create\ the\ Swing\ frame\ and\ its\ content.\n
comment14.params=frame
comment14.target=void\ makeMenuBar(javax.swing.JFrame)
comment14.text=\n\ Create\ the\ main\ frame's\ menu\ bar.\n\ \n\ @param\ frame\ \ \ The\ frame\ that\ the\ menu\ bar\ should\ be\ added\ to.\n
comment2.params=
comment2.target=void\ close()
comment2.text=\n\ Close\ function\:\ close\ the\ current\ image.\n
comment3.params=
comment3.target=void\ saveAs()
comment3.text=\n\ Save\ As\ function\:\ save\ the\ current\ image\ to\ a\ file.\n
comment4.params=
comment4.target=void\ quit()
comment4.text=\n\ Quit\ function\:\ quit\ the\ application.\n
comment5.params=filter
comment5.target=void\ applyFilter(Filter)
comment5.text=\n\ Apply\ a\ given\ filter\ to\ the\ current\ image.\n\ \n\ @param\ filter\ \ \ The\ filter\ object\ to\ be\ applied.\n
comment6.params=
comment6.target=void\ showAbout()
comment6.text=\n\ 'About'\ function\:\ show\ the\ 'about'\ box.\n
comment7.params=
comment7.target=void\ makeLarger()
comment7.text=\n\ Make\ the\ current\ picture\ larger.\n
comment8.params=
comment8.target=void\ makeSmaller()
comment8.text=\n\ Make\ the\ current\ picture\ smaller.\n
comment9.params=filename
comment9.target=void\ showFilename(java.lang.String)
comment9.text=\n\ Show\ the\ file\ name\ of\ the\ current\ image\ in\ the\ fils\ display\ label.\n\ 'null'\ may\ be\ used\ as\ a\ parameter\ if\ no\ file\ is\ currently\ loaded.\n\ \n\ @param\ filename\ \ The\ file\ name\ to\ be\ displayed,\ or\ null\ for\ 'no\ file'.\n
numComments=15

368
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/ImageViewer.java Executable file
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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;
/**
* ImageViewer is the main class of the image viewer application. It builds and
* displays the application GUI and initialises all other components.
*
* To start the application, create an object of this class.
*
* @author Michael Kölling and David J. Barnes.
* @version 3.0
*/
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<>();
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(12, 12, 12, 12));
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(e -> makeSmaller());
toolbar.add(smallerButton);
largerButton = new JButton("Larger");
largerButton.addActionListener(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(e -> openFile());
menu.add(item);
item = new JMenuItem("Close");
item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, SHORTCUT_MASK));
item.addActionListener(e -> close());
menu.add(item);
menu.addSeparator();
item = new JMenuItem("Save As...");
item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, SHORTCUT_MASK));
item.addActionListener(e -> saveAs());
menu.add(item);
menu.addSeparator();
item = new JMenuItem("Quit");
item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, SHORTCUT_MASK));
item.addActionListener(e -> quit());
menu.add(item);
// create the Filter menu
menu = new JMenu("Filter");
menubar.add(menu);
for(Filter filter : filters) {
item = new JMenuItem(filter.getName());
item.addActionListener(e -> applyFilter(filter));
menu.add(item);
}
// create the Help menu
menu = new JMenu("Help");
menubar.add(menu);
item = new JMenuItem("About ImageViewer...");
item.addActionListener(e -> showAbout());
menu.add(item);
}
}

5
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/LighterFilter.ctxt Executable file
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#BlueJ class context
comment0.params=name
comment0.target=LighterFilter(java.lang.String)
comment0.text=\n\ Constructor\ for\ objects\ of\ class\ LighterFilter.\n\ @param\ name\ The\ name\ of\ the\ filter.\n
numComments=1

34
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/LighterFilter.java Executable file
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/**
* An image filter to make the image a bit lighter.
*
* @author Michael Kölling and David J. Barnes.
* @version 1.0
*/
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());
}
}
}
}

14
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/OFImage.ctxt Executable file
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#BlueJ class context
comment0.params=image
comment0.target=OFImage(java.awt.image.BufferedImage)
comment0.text=\n\ Create\ an\ OFImage\ copied\ from\ a\ BufferedImage.\n\ @param\ image\ The\ image\ to\ copy.\n
comment1.params=width\ height
comment1.target=OFImage(int,\ int)
comment1.text=\n\ Create\ an\ OFImage\ with\ specified\ size\ and\ unspecified\ content.\n\ @param\ width\ The\ width\ of\ the\ image.\n\ @param\ height\ The\ height\ of\ the\ image.\n
comment2.params=x\ y\ col
comment2.target=void\ setPixel(int,\ int,\ java.awt.Color)
comment2.text=\n\ Set\ a\ given\ pixel\ of\ this\ image\ to\ a\ specified\ color.\ The\n\ color\ is\ represented\ as\ an\ (r,g,b)\ value.\n\ @param\ x\ The\ x\ position\ of\ the\ pixel.\n\ @param\ y\ The\ y\ position\ of\ the\ pixel.\n\ @param\ col\ The\ color\ of\ the\ pixel.\n
comment3.params=x\ y
comment3.target=java.awt.Color\ getPixel(int,\ int)
comment3.text=\n\ Get\ the\ color\ value\ at\ a\ specified\ pixel\ position.\n\ @param\ x\ The\ x\ position\ of\ the\ pixel.\n\ @param\ y\ The\ y\ position\ of\ the\ pixel.\n\ @return\ The\ color\ of\ the\ pixel\ at\ the\ given\ position.\n
numComments=4

57
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/OFImage.java Executable file
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import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
/**
* OFImage is a class that defines an image in OF (Objects First) format.
*
* @author Michael Kölling and David J. Barnes.
* @version 2.0
*/
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);
}
}

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Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/README.TXT Executable file
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Project: imageviewer, version 3.0
Authors: David Barnes and Michael Kölling
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
Sixth edition
David J. Barnes and Michael Kölling
Pearson Education, 2016
It is discussed in chapter 13.
To use this project, create an instance of class ImageViewer.
For details, refer to the book chapter.

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Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/ThresholdFilter.ctxt Executable file
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#BlueJ class context
comment0.params=name
comment0.target=ThresholdFilter(java.lang.String)
comment0.text=\n\ Constructor\ for\ objects\ of\ class\ ThresholdFilter.\n\ @param\ name\ The\ name\ of\ the\ filter.\n
numComments=1

45
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/ThresholdFilter.java Executable file
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import java.awt.Color;
/**
* An three-level gray-based threshold filter.
*
* @author Michael Kölling and David J. Barnes.
* @version 1.0
*/
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);
}
}
}
}
}

178
Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer3-0/package.bluej Executable file
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#BlueJ package file
dependency1.from=FishEyeFilter
dependency1.to=OFImage
dependency1.type=UsesDependency
dependency10.from=LighterFilter
dependency10.to=OFImage
dependency10.type=UsesDependency
dependency11.from=DarkerFilter
dependency11.to=OFImage
dependency11.type=UsesDependency
dependency12.from=ImageFileManager
dependency12.to=OFImage
dependency12.type=UsesDependency
dependency13.from=ThresholdFilter
dependency13.to=OFImage
dependency13.type=UsesDependency
dependency14.from=ImagePanel
dependency14.to=OFImage
dependency14.type=UsesDependency
dependency15.from=ImageViewer
dependency15.to=ImageFileManager
dependency15.type=UsesDependency
dependency2.from=Filter
dependency2.to=OFImage
dependency2.type=UsesDependency
dependency3.from=ImageViewer
dependency3.to=DarkerFilter
dependency3.type=UsesDependency
dependency4.from=ImageViewer
dependency4.to=OFImage
dependency4.type=UsesDependency
dependency5.from=ImageViewer
dependency5.to=ImagePanel
dependency5.type=UsesDependency
dependency6.from=ImageViewer
dependency6.to=LighterFilter
dependency6.type=UsesDependency
dependency7.from=ImageViewer
dependency7.to=ThresholdFilter
dependency7.type=UsesDependency
dependency8.from=ImageViewer
dependency8.to=FishEyeFilter
dependency8.type=UsesDependency
dependency9.from=ImageViewer
dependency9.to=Filter
dependency9.type=UsesDependency
objectbench.height=76
objectbench.width=1062
package.editor.height=578
package.editor.width=954
package.editor.x=70
package.editor.y=80
package.numDependencies=15
package.numTargets=9
package.showExtends=true
package.showUses=true
project.charset=UTF-8
readme.editor.height=529
readme.editor.width=763
readme.editor.x=53
readme.editor.y=23
target1.editor.height=744
target1.editor.width=953
target1.editor.x=50
target1.editor.y=60
target1.height=60
target1.name=ThresholdFilter
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=110
target1.x=710
target1.y=330
target2.editor.height=735
target2.editor.width=888
target2.editor.x=50
target2.editor.y=60
target2.height=60
target2.name=LighterFilter
target2.naviview.expanded=true
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=100
target2.x=590
target2.y=330
target3.editor.height=700
target3.editor.width=900
target3.editor.x=57
target3.editor.y=50
target3.height=60
target3.name=OFImage
target3.naviview.expanded=true
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=110
target3.x=80
target3.y=470
target4.editor.height=719
target4.editor.width=889
target4.editor.x=50
target4.editor.y=60
target4.height=60
target4.name=Filter
target4.naviview.expanded=true
target4.showInterface=false
target4.type=AbstractTarget
target4.typeParameters=
target4.width=100
target4.x=590
target4.y=210
target5.editor.height=740
target5.editor.width=902
target5.editor.x=50
target5.editor.y=60
target5.height=60
target5.name=FishEyeFilter
target5.naviview.expanded=true
target5.showInterface=false
target5.type=ClassTarget
target5.typeParameters=
target5.width=110
target5.x=770
target5.y=250
target6.editor.height=700
target6.editor.width=900
target6.editor.x=57
target6.editor.y=50
target6.height=60
target6.name=DarkerFilter
target6.naviview.expanded=true
target6.showInterface=false
target6.type=ClassTarget
target6.typeParameters=
target6.width=100
target6.x=470
target6.y=330
target7.editor.height=710
target7.editor.width=963
target7.editor.x=57
target7.editor.y=50
target7.height=60
target7.name=ImageFileManager
target7.naviview.expanded=true
target7.showInterface=false
target7.type=ClassTarget
target7.typeParameters=
target7.width=140
target7.x=50
target7.y=170
target8.editor.height=777
target8.editor.width=995
target8.editor.x=33
target8.editor.y=23
target8.height=60
target8.name=ImageViewer
target8.naviview.expanded=true
target8.showInterface=false
target8.type=ClassTarget
target8.typeParameters=
target8.width=110
target8.x=270
target8.y=70
target9.editor.height=728
target9.editor.width=941
target9.editor.x=50
target9.editor.y=60
target9.height=60
target9.name=ImagePanel
target9.naviview.expanded=true
target9.showInterface=false
target9.type=ClassTarget
target9.typeParameters=
target9.width=140
target9.x=50
target9.y=250