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    <p>Basically, <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/JComponent.html#getInsets%28%29" rel="nofollow"><code>JComponent#getInsets</code></a> will return the components border insets.</p> <p>This is the amount of space from each edge that you should not paint in, think of them as the margins for example...</p> <p>So with that information in hand, you <em>could</em> do something like...</p> <pre><code>// Random size, minimum size of 10, maximum size of 50 randomW = 10 + (Math.random() * 40); randomH = 10 + (Math.random() * 40); // Get the components insets Insets insets = getInsets(); // Calculate the available size by subtract the sum of the margins... int width = getWidth() - (insets.left + insets.right); int height = getHeight() - (insets.top + insets.bottom); // Calculate a postion that is at minimum, the top/left margin // but less than the available space minus the size of the shape... randomX = insets.left + (Math.random() * (width - randomW)); randomY = insets.top + (Math.random() * (height - randomH)); </code></pre> <p>Apologies, the above code comes from the following, runnable example...</p> <pre><code>import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Insets; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.geom.Ellipse2D; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.Timer; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.border.EmptyBorder; import javax.swing.border.LineBorder; public class RandomShape extends JPanel { public static void main(String[] args) { new RandomShape(); } public RandomShape() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { ex.printStackTrace(); } JFrame frame = new JFrame("Testing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { private double randomX; private double randomY; private double randomW; private double randomH; public TestPane() { setBorder(BorderFactory.createCompoundBorder(new EmptyBorder(10,10,10,10), new LineBorder(Color.BLACK))); Timer timer = new Timer(500, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { random(); } }); timer.start(); } public void random() { randomW = 10 + (Math.random() * 40); randomH = 10 + (Math.random() * 40); Insets insets = getInsets(); int width = getWidth() - (insets.left + insets.right); int height = getHeight() - (insets.top + insets.bottom); randomX = insets.left + (Math.random() * (width - randomW)); randomY = insets.top + (Math.random() * (height - randomH)); repaint(); } @Override public Dimension getPreferredSize() { return new Dimension(200, 200); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); Ellipse2D.Double circle = new Ellipse2D.Double(randomX, randomY, randomW, randomH); g2d.fill(circle); g2d.dispose(); } } } </code></pre> <p>So you'll need to splice the concept into your own code ;)</p>
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    1. POKeep paint within JPanel border
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    1. COThank you, good sir.
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    2. COJust one problem: the ellipses now all paint within the screen, which is perfect, but they still go beyond the Line Border (they get capped by the size of the EmptyBorder). Maybe there is no way to keep it within the Line Border without invoking some sort of Java Black Magic, but thank you as the solution you gave has at least contained it to the panel's border.
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    3. CODid you try running my example, because the minute or so that I ran it, it never went out side the available area. Are you ensuring that x+width and y+height are within the available space?
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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