JScrollPane bars do not show

Question

Hi,
I add the Panel that contains a large image to a scroll pane. However, the image is large, and the scroll bars do not show.
    JScrollPane ScrollPaneScroller = new JScrollPane();
    this.getContentPane().add(ScrollPaneScroller, BorderLayout.CENTER);
    ScrollPaneScroller.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    ScrollPaneScroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    ScrollPaneScroller.getViewport().add(PanelwithImage, null);
    PanelwithImage.setCenter(this.getWidth(), this.getHeight());Also, how to display the center of the image?

Answer 1

Aw hell...
import java.awt.Dimension;
import java.awt.Image;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;
public class BigDukeImage {
  public static final String IMAGE_PATH = "http://"
      + "duke.kenai.com/nyanya/NyaNya.jpg";
  private static final Dimension SCROLLPANE_SIZE = new Dimension(900, 700);
  private static void createAndShowUI() {
    Image image = null;
    try {
      URL url = new URL(IMAGE_PATH);
      image = ImageIO.read(url);
      JLabel label = new JLabel(new ImageIcon(image));
      JScrollPane scrollpane = new JScrollPane(label);
      scrollpane.setPreferredSize(SCROLLPANE_SIZE);
      JFrame frame = new JFrame("Big Duke Image");
      frame.getContentPane().add(scrollpane);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
      JScrollBar vertSBar = scrollpane.getVerticalScrollBar();
      JScrollBar horzSBar = scrollpane.getHorizontalScrollBar();
      vertSBar.setValue(
          (vertSBar.getMaximum() - vertSBar.getVisibleAmount()) / 2);
      horzSBar.setValue(
          (horzSBar.getMaximum() - horzSBar.getVisibleAmount()) / 2);
    } catch (IOException e) {
      e.printStackTrace();
  public static void main(String[] args) {
    java.awt.EventQueue.invokeLater(new Runnable() {
      public void run() {
        createAndShowUI();
}