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grace s

Posts: 2
Nickname: gracie
Registered: Mar, 2002

swing

Posted: Mar 10, 2002 8:12 AM

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.StringTokenizer;

public class Scroll extends JFrame
{
public Scroll() {
super("--Scroll--");

ImageIcon ii = new ImageIcon("images/pic.gif");

JScrollPane jsp = new JScrollPane(new GrabAndScrollLabel(ii));

getContentPane().add(jsp);
setSize(100,250);
setVisible(true);

WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
};
addWindowListener(l);
}

public static void main(String[] args) {

new Scroll();

}

class GrabAndScrollLabel extends JLabel
{
public GrabAndScrollLabel(ImageIcon i){
super(i);

MouseInputAdapter mia = new MouseInputAdapter() {
int m_XDifference, m_YDifference;
Container c;

public void mouseDragged(MouseEvent e) {
c = GrabAndScrollLabel.this.getParent();
if (c instanceof JViewport) {
JViewport jv = (JViewport) c;
Point p = jv.getViewPosition();
int newX = p.x - (e.getX()-m_XDifference);
int newY = p.y - (e.getY()-m_YDifference);

int maxX = GrabAndScrollLabel.this.getWidth()
- jv.getWidth();
int maxY = GrabAndScrollLabel.this.getHeight()
- jv.getHeight();
if (newX < 0)
newX = 0;
if (newX > maxX)
newX = maxX;
if (newY < 0)
newY = 0;
if (newY > maxY)
newY = maxY;

jv.setViewPosition(new Point(newX, newY));
}
}

public void mousePressed(MouseEvent e) {
setCursor(Cursor.getPredefinedCursor(
Cursor.MOVE_CURSOR));
m_XDifference = e.getX();
m_YDifference = e.getY();
}

public void mouseReleased(MouseEvent e) {
setCursor(Cursor.getPredefinedCursor(
Cursor.DEFAULT_CURSOR));
}
};
addMouseMotionListener(mia);
addMouseListener(mia);
}
}
}

class ShapesPanel extends JPanel {
final Color bg = Color.white;
final Color fg = Color.red;

public ShapesPanel() {
//Initialize drawing colors, border, opacity.
setBackground(bg);
setForeground(fg);
setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createRaisedBevelBorder(),
BorderFactory.createLoweredBevelBorder()));

}

public void paintComponent(Graphics g) {
super.paintComponent(g);

// drawLine(start and end pt coords)
g.drawLine(50, 150, 250, 150);
}

}

Hi,

The above code displays a scrollable picture - ?pic.gif? using a swing Gui. But I was wondering if I could edit the code so that instead of displaying ?pic.gif? it would display the line drawn in the Shapes panel class. What would I need to do to set JScrollPane jsp equal to lines or shapes that are drawn in the ShapesPanel class.

Thank for any help.

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