BufferedImageMouseDrag.java Source code

Introduction

Here is the source code for BufferedImageMouseDrag.java

Source

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.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.TitledBorder;

public class BufferedImageMouseDrag extends JFrame {
    DisplayCanvas canvas;

    public BufferedImageMouseDrag() {
        super();
        Container container = getContentPane();

        canvas = new DisplayCanvas();
        container.add(canvas);

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        setSize(450, 400);
        setVisible(true);
    }

    public static void main(String arg[]) {
        new BufferedImageMouseDrag();
    }
}

class DisplayCanvas extends JPanel {
    int x, y;

    BufferedImage bi;

    DisplayCanvas() {
        setBackground(Color.white);
        setSize(450, 400);
        addMouseMotionListener(new MouseMotionHandler());

        Image image = getToolkit().getImage("largeJava2sLogo.gif");

        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 gif file");
            System.exit(0);
        }

        bi = new BufferedImage(image.getWidth(this), image.getHeight(this), BufferedImage.TYPE_INT_ARGB);
        Graphics2D big = bi.createGraphics();
        big.drawImage(image, 0, 0, this);
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2D = (Graphics2D) g;

        g2D.drawImage(bi, x, y, this);
    }

    class MouseMotionHandler extends MouseMotionAdapter {
        public void mouseDragged(MouseEvent e) {
            x = e.getX();
            y = e.getY();
            repaint();
        }
    }
}