Cutting and moving around - g2d

Question

Hello java people!
I'm still fooling around with this example program here:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
public class DrawOnImage extends JFrame implements ActionListener
    DrawingPanel mdp;
    JPanel bp;
    JButton redButton,clearButton;
    public DrawOnImage()
        mdp = new DrawingPanel();
        bp = new JPanel();
        bp.setLayout(new GridLayout(2, 4, 2, 2));
        redButton = addButton(Color.red);
        clearButton = addButton(null);
        clearButton.setText("New");
        getContentPane().add("Center", mdp);
        getContentPane().add("South", bp);
    private JButton addButton(Color color)
        JButton b = new JButton();
        if (color != null)b.setBackground(color);
        b.setText("Paint");
        bp.add(b);
        b.addActionListener(this);
        return(b);
    public void actionPerformed(ActionEvent e)
        String s = e.getActionCommand();
        if (s.equals("Paint"))
            JButton button = (JButton)e.getSource();
            mdp.setPaintColor(button.getBackground());
        if (s.equals("New"))
            mdp.clearPaint();
    public static void main(String[] args)
        JFrame frame = new DrawOnImage();
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible( true );
    public class DrawingPanel extends JPanel implements MouseListener, MouseMotionListener
        Image image;
        Graphics2D g2d;
        int brushSize = 5;
        Point lastPoint;
        public DrawingPanel()
            setPreferredSize( new Dimension(300, 300) );
            addMouseListener(this);
            addMouseMotionListener(this);
        public void mouseClicked(MouseEvent e) {}
        public void mouseEntered(MouseEvent e) {}
        public void mouseExited(MouseEvent e) {}
        public void mouseReleased(MouseEvent e) {}
        public void mouseMoved(MouseEvent e) {}
        public void mousePressed(MouseEvent e)
            lastPoint = e.getPoint();
            draw( lastPoint );
        public void mouseDragged(MouseEvent e)
            double xDelta = e.getX() - lastPoint.getX();
            double yDelta = e.getY() - lastPoint.getY();
            double delta = Math.max(Math.abs(xDelta), Math.abs(yDelta));
            double xIncrement = xDelta / delta;
            double yIncrement = yDelta / delta;
            double xStart = lastPoint.getX();
            double yStart = lastPoint.getY();
            for (int i = 0; i < delta; i++)
                Point interpolated = new Point((int)xStart, (int)yStart);
                draw( interpolated );
                xStart += xIncrement;
                yStart += yIncrement;
            draw(e.getPoint());
            lastPoint = e.getPoint();
        private void draw(Point start)
            int x = start.x - (brushSize/2) + 1;
            int y = start.y - (brushSize/2) + 1;
            g2d.fillOval(x, y, brushSize, brushSize);
            repaint(x, y, brushSize, brushSize);
        public void setPaintColor(Color color)
            g2d.setColor(color);
        public void clearPaint()
            g2d.setColor( Color.white );
            g2d.fillRect(0, 0, getWidth(), getHeight());
            repaint();
            g2d.setColor( Color.black );
        public void paintComponent(Graphics g)
            super.paintComponent(g);
            if (image == null)
                image = createImage(getWidth(), getHeight());
                g2d = (Graphics2D)image.getGraphics();
                g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                g2d.setColor(Color.white);
                g2d.fillRect(0, 0, getWidth(), getHeight());
                g2d.setColor(Color.black);
            Rectangle r = g.getClipBounds();
            g.drawImage(image, r.x, r.y, r.width+r.x, r.height+r.y, r.x, r.y, r.width+r.x, r.height+r.y, null);
}My version got a tidbit more complicated, but that's besides the point. What I want to do now is mark a certain selection of the image, and move it around, place it somewhere else. Maybe even put it in the clipboard.
Unfortunately, the internet is not helping me much with this task.
Help would be appreciated!
I'm fairly new to java, but I'd be willing to try to do it myself if you point me in the right direction, naturally.
Thanks.

Answer 1

Kyosys wrote:
My version got a tidbit more complicated, but that's besides the point. What I want to do now is mark a certain selection of the image, and move it around, place it somewhere else. Maybe even put it in the clipboard.
Unfortunately, the internet is not helping me much with this task.
Help would be appreciated!This should help: [http://java.sun.com/docs/books/tutorial/2d/index.html]
I'm fairly new to java, but I'd be willing to try to do it myself if you point me in the right direction, naturally.
Thanks.It looks like you're starting to run before being able to crawl. I'm not sure what "fairly new to Java" means in your book, but in mine, it means that you don't master the basics of Java. I recommend starting with non-GUI stuff before delving into the deep!
[http://java.sun.com/docs/books/tutorial/]
Anyway, best of luck!