public class Test
{
public static void main(String[] args)
{
JFrame iframe = new ImageViewerGUI();
iframe.setVisible(true);
}
}
class ImageViewerGUI
extends BaseFrame
{
JFileChooser d;
BufferedImage bufferedImage;
final JPanel p;
final JLabel l;
ScaledImage si = new ScaledImage();
int scaleFactor = 100;
final JLabel textlabel;
public ImageViewerGUI()
{
l = new JLabel();
p = new JPanel();
p.add(l);
getContentPane().add(p, BorderLayout.CENTER);
final JSlider slider = new JSlider(0, 200);
slider.addChangeListener(new ChangeListener()
{
public final void stateChanged(ChangeEvent e)
{
if (!slider.getValueIsAdjusting())
{
scaleFactor = slider.getValue();
String str = Integer.toString(scaleFactor);
textlabel.setText(str);
si.scaleImage((bufferedImage.getWidth() * scaleFactor) / 100);
l.setIcon(new ImageIcon(si.getScaledImage()));
}
}
});
JPanel sliderpanel = new JPanel();
sliderpanel.add(slider);
textlabel = new JLabel(Integer.toString(scaleFactor));
sliderpanel.add(textlabel);
getContentPane().add(sliderpanel, BorderLayout.SOUTH);
// create a file chooser
d = new JFileChooser();
d.setFileFilter(new FileFilter()
{
public boolean accept(File f)
{
return f.isDirectory() || f.getName().toLowerCase().endsWith(".jpg");
}
public String getDescription()
{
return "*.jpg";
}
});
// Create menu bar
JMenuBar mbar = new JMenuBar();
setJMenuBar(mbar);
// Build the File-Menu
JMenu menu = new JMenu("File");
menu.setMnemonic(KeyEvent.VK_F);
mbar.add(menu);
// The Open JMenuItem
JMenuItem openItem = new JMenuItem("Open", KeyEvent.VK_O);
openItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_MASK));
openItem.getAccessibleContext().setAccessibleDescription("Open a new image file");
openItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
int status = d.showOpenDialog(null);
if (status == d.APPROVE_OPTION)
{
File file = d.getSelectedFile();
final Image template = new ImageIcon(Toolkit.getDefaultToolkit().getImage(file.getAbsolutePath())).getImage();
// Create the buffered image
// notice: bufferedImage is a bufferedImage type
bufferedImage = new BufferedImage(template.getWidth(null), template.getHeight(null),
BufferedImage.TYPE_INT_RGB);
si.setScaledImage(bufferedImage);
si.scaleImage((bufferedImage.getWidth() * scaleFactor) / 100);
// Copy image to scaled buffered image instance
Graphics g = si.getScaledImage().getGraphics();
// Clear background and paint the image
g.setColor(Color.black);
g.fillRect(0, 0, template.getWidth(null), template.getHeight(null));
g.drawImage(template, 0, 0, null);
g.dispose();
textlabel.setText(Integer.toString(scaleFactor));
l.setIcon(new ImageIcon(si.getScaledImage()));
}
else if (status == d.CANCEL_OPTION)
{
System.out.println("You cancelled operation");
}
}
});
menu.add(openItem);
JMenuItem saveItem = new JMenuItem("Save", KeyEvent.VK_S);
saveItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, ActionEvent.CTRL_MASK));
saveItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ie)
{
try
{
Iterator it = ImageIO.getImageWritersByFormatName("jpeg");
ImageWriter writer = (ImageWriter)it.next();
// instantiate an ImageWriterParam object with default compression
// options
ImageWriteParam iwp = writer.getDefaultWriteParam();
iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwp.setCompressionQuality(1); // an integer between 0 and 1
File file = new File(d.getSelectedFile().getAbsolutePath());
FileImageOutputStream output = new FileImageOutputStream(file);
writer.setOutput(output);
IIOImage image = new IIOImage(si.getScaledImage(), null, null);
writer.write(null, image, iwp);
output.flush();
writer.dispose();
// close the stream to give other programs access to the image
output.close();
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
});
menu.add(saveItem);
JMenuItem saveAsItem = new JMenuItem("Save As...", KeyEvent.VK_A);
saveAsItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, ActionEvent.CTRL_MASK));
saveAsItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent sa)
{
int status = d.showSaveDialog(null);
if (status == d.APPROVE_OPTION)
{
try
{
Iterator it = ImageIO.getImageWritersByFormatName("jpeg");
ImageWriter writer = (ImageWriter)it.next();
// instantiate an ImageWriterParam object with default
// compression options
ImageWriteParam iwp = writer.getDefaultWriteParam();
iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwp.setCompressionQuality(1); // an integer between 0 and 1
File file = d.getSelectedFile();
FileImageOutputStream output = new FileImageOutputStream(file);
writer.setOutput(output);
IIOImage image = new IIOImage(si.getScaledImage(), null, null);
writer.write(null, image, iwp);
output.flush();
writer.dispose();
// close the stream to give other programs access to the image
output.close();
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
else if (status == d.CANCEL_OPTION)
{
System.out.println("You cancelled operation");
}
}
});
menu.add(saveAsItem);
JMenuItem exitItem = new JMenuItem("Exit", KeyEvent.VK_E);
exitItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, ActionEvent.CTRL_MASK));
exitItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent qe)
{
System.exit(0);
}
});
menu.add(exitItem);
// Build second menu in menu bar
JMenu optionsMenu = new JMenu("Edit");
optionsMenu.setMnemonic(KeyEvent.VK_P);
optionsMenu.getAccessibleContext().setAccessibleDescription("Set Options");
mbar.add(optionsMenu);
JMenuItem resizeItem = new JMenuItem("Resize", KeyEvent.VK_R);
resizeItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R, ActionEvent.CTRL_MASK));
resizeItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String width = JOptionPane.showInputDialog((Component)e.getSource(), "new Image Width");
if (width != null && !width.equals(""))
{
JOptionPane.showMessageDialog((Component)e.getSource(), "Preferred Image Width: " + width);
int newWidth = Integer.parseInt(width);
si.scaleImage(newWidth);
l.setIcon(new ImageIcon(si.getScaledImage()));
}
}
});
optionsMenu.add(resizeItem);
}
public static void main(String[] args)
{
JFrame iframe = new ImageViewerGUI();
iframe.setVisible(true);
}
}
class BaseFrame
extends JFrame
{
BaseFrame()
{
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
setSize(800, 500);
setLocationRelativeTo(null);
}
}
class ScaledImage
extends JPanel
{
private BufferedImage scaledImage;
int width, height;
public void setScaledImage(BufferedImage bufferedImage)
{
scaledImage = bufferedImage;
width = scaledImage.getWidth();
height = scaledImage.getHeight();
}
public BufferedImage getScaledImage()
{
return scaledImage;
}
public BufferedImage scaleImage(int newWidth)
{
int oldWidth = scaledImage.getWidth();
int oldHeight = scaledImage.getHeight();
int newHeight = (newWidth * oldHeight) / oldWidth;
Image resizedImage = scaledImage.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH);
// This code ensures that all the pixels in the image are loaded
Image temp = new ImageIcon(resizedImage).getImage();
// Create a buffered Image
BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null), temp.getHeight(null), BufferedImage.TYPE_INT_RGB);
// Copy image to buffered image
Graphics g = bufferedImage.getGraphics();
// Clear background and paint the image
g.setColor(Color.black);
g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));
g.drawImage(temp, 0, 0, null);
scaledImage = bufferedImage;
return scaledImage;
}
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
if (scaledImage != null) g.drawImage(scaledImage, 0, 0, this);
}
}
