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POKeep paint within JPanel border
 

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    <p>So here is the problem: My program so far works okay, but this snippet of code does not work as intended:</p> <pre><code>pane2 = (new JPanel(){ private static final long serialVersionUID = 1L; @Override public void paintComponent(Graphics g){ super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; Ellipse2D.Double circle = new Ellipse2D.Double(randomX, randomY, randomW, randomH); g2d.fill(circle); } }); pane2.setBorder(BorderFactory.createCompoundBorder(new EmptyBorder(10,10,10,10), new LineBorder(Color.BLACK))); </code></pre> <p>So what the program is supposed to do is basically repaint the contents of the panel, basically randomizing where the Ellipse is painted each time with each press of the Paint button. It works, but it does not keep the ellipses within the borders of the panel. Is it possible to make that work without adding some sort extra layer like a Container or something and adding padding to the container, or is that the only way (is it even viable to do that)?</p> <p>The button code:</p> <pre><code>bpaint.addActionListener(new ActionListener(){ @Override public void actionPerformed(ActionEvent e) { randomX = Math.random() * pane2.getHeight(); randomY = Math.random() * pane2.getWidth(); randomW = Math.random() * 100; randomH = Math.random() * 100; pane2.validate(); pane2.repaint(); } }); </code></pre> <p>I apologize if there is a duplicate of this question somewhere. If there was, it certainly wasn't worded in a way where I would have known it was a duplicate.</p> <p>I <em>did</em> also try to add a global padding variable, but since the EmptyBorder(units) are not based on the same size that Ellipse2D(units) use, adding a global padding variable is a shifty solution at best, and I can only approximate what the ratio may be. I think (or at least hope) that there is a much simpler way I can keep them within the border -- <strong><em>accurately</em></strong>.</p>
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    1. COAre you asking to keep the random coordinates from being computed such that the values can never go beyond the border? or to modify the paint to only paint within the border?
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    2. CO@dkatzel I am asking the former, since that is the most efficient solution. I tried making a global 'padding' variable, but it does not work in the way that it would seem...
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    3. CO@Michanne, the latter of dkatzel's options is actually just as efficient in terms of coding, it not CPU cycles. You can call `setClipRect()` on your graphics object to define the borders of the allowed painting area. Nothing you draw through that graphics object will appear outside the clipping region.
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