RasterDemo.java Source code

Introduction

Here is the source code for RasterDemo.java

Source

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);
    }
}