Image Effect: Rotate Image using DataBuffer
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.MediaTracker;
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.DataBuffer;
import javax.swing.Box;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToggleButton;
public class RasterDemo extends JFrame {
RasterPanel displayPanel;
JToggleButton flipButton;
public RasterDemo() {
super();
Container container = getContentPane();
displayPanel = new RasterPanel();
container.add(displayPanel);
Box box = Box.createHorizontalBox();
flipButton = new JToggleButton("Flip the Image");
flipButton.addActionListener(new ButtonListener());
box.add(Box.createHorizontalGlue());
box.add(flipButton);
box.add(Box.createHorizontalGlue());
container.add(box, BorderLayout.SOUTH);
addWindowListener(new WindowEventHandler());
setSize(450, 400);
show();
}
class WindowEventHandler extends WindowAdapter {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
public static void main(String arg[]) {
new RasterDemo();
}
class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (!displayPanel.flipped) {
displayPanel.flipBufferedImage();
displayPanel.bi = displayPanel.bi2;
displayPanel.flipped = true;
}
// If the image has already been flipped
else {
// Prepare to display the normal image
displayPanel.bi = displayPanel.bi1;
displayPanel.flipped = false;
}
// Update the display panel
displayPanel.repaint();
}
}
}
class RasterPanel extends JPanel {
BufferedImage bi, bi1, bi2;
boolean flipped = false;
RasterPanel() {
setBackground(Color.white);
setSize(450, 400);
Image image = getToolkit().getImage("largeJava2sLogo.jpg");
MediaTracker mt = new MediaTracker(this);
mt.addImage(image, 1);
try {
mt.waitForAll();
} catch (Exception e) {
System.out.println("Exception while loading image.");
}
if (image.getWidth(this) == -1) {
System.out.println("No jpg file");
System.exit(0);
}
bi1 = new BufferedImage(image.getWidth(this), image.getHeight(this),
BufferedImage.TYPE_INT_ARGB);
Graphics2D big = bi1.createGraphics();
big.drawImage(image, 0, 0, this);
bi = bi1;
}
public void flipBufferedImage() {
bi2 = new BufferedImage(bi1.getWidth(), bi1.getHeight(), bi1.getType());
DataBuffer db1 = bi1.getRaster().getDataBuffer();
DataBuffer db2 = bi2.getRaster().getDataBuffer();
for (int i = db1.getSize() - 1, j = 0; i >= 0; --i, j++) {
db2.setElem(j, db1.getElem(i));
}
}
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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