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    <p>In order to accomplish this, I believe you'll need to make use of the <code>Glass Pane</code>. The <code>Glass Pane</code> sits on top of everything in the <code>JRootPane</code> and fills the entire view. This particular position allows two distinct capabilities:</p> <ul> <li>Intercepting mouse and keyboard events</li> <li><strong>Drawing over the entire user interface</strong></li> </ul> <p>I believe your question is addressed by the second capability. The following is an example implementation, which you can later tailor to meet your own needs. Note that I've left out a lot of detail with regard to <code>Glass Pane</code> that you'll need to research on your own.</p> <p><strong>CODE</strong></p> <pre><code>import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Point; import java.awt.RenderingHints; import java.awt.event.ComponentAdapter; import java.awt.event.ComponentEvent; import java.awt.event.KeyAdapter; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingUtilities; public class GlassPaneDemo { private static BufferedImage bi; public static void main(String[] args){ try { loadImages(); SwingUtilities.invokeLater(new Runnable(){ @Override public void run() { createAndShowGUI(); } }); } catch (IOException e) { // handle exception } } private static void loadImages() throws IOException{ bi = ImageIO.read(new File("src/resources/person.png")); } private static void createAndShowGUI(){ final JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setResizable(false); frame.setGlassPane(new CustomGlassPane()); frame.getContentPane().add(getButtonPanel()); frame.pack(); frame.setLocationRelativeTo(null); frame.getGlassPane().setVisible(true); frame.setVisible(true); } private static final JPanel getButtonPanel(){ @SuppressWarnings("serial") final JPanel panel = new JPanel(){ @Override protected void paintComponent(Graphics g){ Graphics gCopy = g.create(); gCopy.setColor(Color.BLUE.darker()); gCopy.fillRect(0, 0, getWidth(), getHeight()); gCopy.dispose(); } }; final JLabel labelOne = new JLabel(); labelOne.setIcon(new ImageIcon(bi)); final JLabel labelTwo = new JLabel(); labelTwo.setIcon(new ImageIcon(bi)); panel.add(labelOne); panel.add(labelTwo); return panel; } @SuppressWarnings("serial") private static class CustomGlassPane extends JComponent{ private Point p1; private Point p2; private boolean lineDrawn; public CustomGlassPane(){ addMouseListener(new MouseAdapter(){ @Override public void mouseClicked(MouseEvent e){ if(p1 == null || lineDrawn){ if(lineDrawn){ p1 = null; p2 = null; lineDrawn = false; } p1 = e.getPoint(); }else{ p2 = e.getPoint(); repaint(); // not optimal lineDrawn = true; } } }); // Block all other input events addMouseMotionListener(new MouseMotionAdapter(){}); addKeyListener(new KeyAdapter(){}); addComponentListener(new ComponentAdapter(){ @Override public void componentShown(ComponentEvent e){ requestFocusInWindow(); } }); setFocusTraversalKeysEnabled(false); } @Override protected void paintComponent(Graphics g){ if(p1 != null &amp;&amp; p2 != null){ Graphics2D g2 = (Graphics2D) g.create(); g2.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.setColor(Color.RED); g2.drawLine((int)p1.getX(), (int)p1.getY(), (int)p2.getX(), (int)p2.getY()); g2.dispose(); } } } } </code></pre> <p><strong>OUTPUT</strong></p> <p><img src="https://i.stack.imgur.com/9BbaE.png" alt="enter image description here"></p> <p><strong>EXPLANATION</strong></p> <p>In this example, I clicked two arbitrary points within each <code>JLabel</code>, and then drew a connecting line.</p>
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    1. COIf this is really working... Then I learned something new today :D, I though that we should call `drawChilderen` or something like that in our overrided method. +1
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    2. CO@Martijn, Yes, this is really working. :)
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    3. COThanks, but this will works only for `Component`, respectively connect `Component`. I need draw lines through `JScrollPane`. I get some points from images and i want to connect them. This example doesn't work for that.
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