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copied!<p>I tried your code. I think your problem comes from the fact that you paint on the <strong>t3_aux1</strong> using <strong>t3_aux2</strong> coordinates. I'll try something to confirm that, and I come back here ...</p> <p><strong>EDIT:</strong> OK, that's it.</p> <p>in <strong>t3_aux1</strong> constructor, if you write </p> <pre><code>System.out.println("panel1 height = " + panel1.getHeight()); System.out.println("label1 height = " + label1_x.getHeight()) </code></pre> <p>it prints </p> <pre><code>panel1 height = 42 label1 height = 20 </code></pre> <p>So your offset is 42 + 20 + 4*2 = 70</p> <p>4*2 comes from your lines borders with a thickness of 2.</p> <p>Since it's possible to calculate the exact offset, you can dynamically fix it.</p> <p><strong>EDIT 2 :</strong></p> <p>In fact, the coordinates you uses come from panel2 since the mouseListener is attached to panel2. But you draw on the JFrame Graphics, not on panel2 graphics.</p> <p>writing this should fix your coordinates problem.</p> <pre><code>inst2.paintComponent(panel2.getGraphics()); </code></pre> <p>But as Kleopatra said, you're not doing it the right way. You should never call <code>getGraphics()</code> or <code>paintComponent()</code>. I think you should consider using <code>java.awt.Canvas</code> as a super class for your "panel2" object.</p> <p>One more advice : Be aware that your drawings aren't memorized, so, if you reduce the window or hide it behind another one, everything drawn will be lost.</p>

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