Java 2D in the Real World
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Yesterday we discussed the Java 2D API: how it works and how to use it. Today we're going to get our hands dirty with code as we study a real world application.
The application being developed exposes many of the advanced features of Java 2D API. It contains the following functions:
Kucci.java - This file is the starting point of the application.
Kucchi_PaintBar.java - This item draws and handles the shape and drawing functions.
Kucchi_MenuBar.java - For the menu bar and the associated functionalities.
ImageFrame.java - Displays the image onto the screen.
Here is the Kucchi_MenuBar.java. It contains only File functions at present:
package Kucchi;
import javax.swing.JDialog;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFileChooser;
import java.awt.image.BufferedImage;
import java.io.File;
public class Kucchi_MenuBar extends JMenuBar {
public File f;
public BufferedImage image;
public Graphics g;
public Graphics2D g2d;
public ImageFrame IFrame;
/** Creates a new instance of MenuBar */
public Kucchi_MenuBar() {
K_FileMenu();
}
public void K_FileMenu() {
JMenu K_File;
JMenuItem K_New,K_Open,K_Save,K_SaveAs,
K_SaveAll,K_Print,K_PgSetup,K_Exit;
K_File = new JMenu("File");
K_New = new JMenuItem("New");
K_File.add(K_New);
K_New.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
File_New();
}
}
);
K_Open = new JMenuItem("Open");
K_File.add(K_Open);
K_Open.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try{File_Open();}
catch(IOException i){}
}
}
);
K_File.addSeparator();
K_Save = new JMenuItem("Save");
K_File.add(K_Save);
K_Save.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try{File_Save(f,image);}
catch(IOException i){}
}
}
);
//similarly set up other menu items
K_File.addSeparator();
K_Exit = new JMenuItem("Exit");
K_File.add(K_Exit);
K_Exit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand() == "Exit") {
System.exit(0);
}
}
}
);
this.add(K_File);
}
public void File_New() {
image = null;
JFrame Jf = new JFrame();
JPanel Jp = new JPanel();
NewImage jd = new NewImage(Jf,"New Image",true);
//image.setRGB(0,1,15);
jd.show();
System.out.println(jd.d_image.width +" "+ jd.d_image.height);
Jf.setTitle(jd.t_title.getText());
Jf.getContentPane().add(Jp);
Jf.setSize(jd.d_image);
Jf.show();
}
public void File_Open() throws IOException{
NewFileChooser choose = new NewFileChooser();
int state = choose.chooser.showOpenDialog(this);
if(state == JFileChooser.APPROVE_OPTION){
f = choose.chooser.getSelectedFile();
image = ImageIO.read(f);
String f_name = f.getName();
IFrame = new ImageFrame(image,f_name);
System.out.print(image.getWidth() + " " + image.getHeight());
IFrame.setSize(image.getWidth(),image.getHeight());
IFrame.show();
}
}
//It gets the file choosen through the JFileChooser and saves it using the
//ImageIO class's write method
public void File_Save(File f,BufferedImage image) throws IOException{
if(f != null){
if (f.exists()){
ImageIO.write(image," ",f);
System.out.println(f.toString());
}}
else{
JFileChooser chooser = new JFileChooser();
int result = chooser.showSaveDialog(null);
if (result == JFileChooser.APPROVE_OPTION){
ImageIO.write(image,"jpg ",chooser.getSelectedFile());
}
}
}
//It gets the file choosen through the JFileChooser
//and saves it using the
//ImageIO class's write method with a different name
public void File_SaveAs(File f,BufferedImage image) throws IOException{
JFileChooser chooser = new JFileChooser();
int result = chooser.showSaveDialog(null);
if (result == JFileChooser.APPROVE_OPTION){
ImageIO.write(image,"jpg ",chooser.getSelectedFile());
}
}
}
Next: The Paint Bar >>
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