import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.color.ColorSpace;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.TitledBorder;
public class ColorConvertDemo extends JFrame {
ColorPanel displayPanel;
JButton grayButton, resetButton;
public ColorConvertDemo() {
super();
Container container = getContentPane();
displayPanel = new ColorPanel();
container.add(displayPanel);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(1, 2));
panel.setBorder(new TitledBorder(
"Click the Gray Scale Button to Create Gray Scale Image..."));
grayButton = new JButton("Gray Scale");
grayButton.addActionListener(new ButtonListener());
resetButton = new JButton("Reset");
resetButton.addActionListener(new ButtonListener());
panel.add(grayButton);
panel.add(resetButton);
container.add(BorderLayout.SOUTH, panel);
addWindowListener(new WindowEventHandler());
setSize(displayPanel.getWidth(), displayPanel.getHeight() + 15);
setVisible(true);
}
class WindowEventHandler extends WindowAdapter {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
public static void main(String arg[]) {
new ColorConvertDemo();
}
class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
JButton button = (JButton) e.getSource();
if (button.equals(grayButton)) {
displayPanel.grayOut();
displayPanel.repaint();
} else if (button.equals(resetButton)) {
displayPanel.reset();
displayPanel.repaint();
}
}
}
}
class ColorPanel extends JLabel {
Image displayImage;
BufferedImage bi;
Graphics2D big;
ColorPanel() {
setBackground(Color.black);
loadImage();
setSize(displayImage.getWidth(this), displayImage.getWidth(this));
createBufferedImage();
}
public void loadImage() {
displayImage = Toolkit.getDefaultToolkit().getImage(
"largeJava2sLogo.jpg");
MediaTracker mt = new MediaTracker(this);
mt.addImage(displayImage, 1);
try {
mt.waitForAll();
} catch (Exception e) {
System.out.println("Exception while loading.");
}
if (displayImage.getWidth(this) == -1) {
System.out.println("No jpg ");
System.exit(0);
}
}
public void createBufferedImage() {
bi = new BufferedImage(displayImage.getWidth(this), displayImage
.getHeight(this), BufferedImage.TYPE_INT_RGB);
big = bi.createGraphics();
big.drawImage(displayImage, 0, 0, this);
}
public void grayOut() {
ColorConvertOp colorConvert = new ColorConvertOp(ColorSpace
.getInstance(ColorSpace.CS_GRAY), null);
colorConvert.filter(bi, bi);
}
public void reset() {
big.setColor(Color.black);
big.clearRect(0, 0, bi.getWidth(this), bi.getHeight(this));
big.drawImage(displayImage, 0, 0, this);
}
public void update(Graphics g) {
g.clearRect(0, 0, getWidth(), getHeight());
paintComponent(g);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2D = (Graphics2D) g;
g2D.drawImage(bi, 0, 0, this);
}
}
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