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PODraw in an image inside panel
 

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    <p>I have a panel with two buttons. I'm trying to insert an image inside the panel and I want to draw lines inside the image after clicking on a button. I have used the below code but this doesn't seem to work.</p> <pre><code>public class Try_Panel extends JFrame { // start attributes private JPanel jPanel1 = new JPanel(null, true); private JButton jButton1 = new JButton(); private JButton jButton2 = new JButton(); // end attributes public Try_Panel(String title) { // Frame-Init super(title); setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE); int frameWidth = 300; int frameHeight = 300; setSize(frameWidth, frameHeight); Dimension d = Toolkit.getDefaultToolkit().getScreenSize(); int x = (d.width - getSize().width) / 2; int y = (d.height - getSize().height) / 2; setLocation(x, y); setResizable(false); Container cp = getContentPane(); cp.setLayout(null); // start components jPanel1.setBounds(48, 24, 209, 145); jPanel1.setOpaque(false); cp.add(jPanel1); jButton1.setBounds(88, 208, 75, 25); jButton1.setText("jButton1"); jButton1.setMargin(new Insets(2, 2, 2, 2)); jButton1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jButton1_ActionPerformed(evt); } }); cp.add(jButton1); jButton2.setBounds(184, 208, 75, 25); jButton2.setText("jButton2"); jButton2.setMargin(new Insets(2, 2, 2, 2)); jButton2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jButton2_ActionPerformed(evt); } }); cp.add(jButton2); // end components setVisible(true); } // end of public Try_Panel // start methods public void jButton1_ActionPerformed(ActionEvent evt) { BufferedImage image=new BufferedImage(jPanel1.getWidth(), jPanel1.getHeight(), BufferedImage.TYPE_3BYTE_BGR); JLabel l=new JLabel(new ImageIcon(image)); Graphics graphics = image.getGraphics(); Graphics2D g = (Graphics2D) graphics; g.fillRect(0, 0, image.getWidth(), image.getHeight()); g.setColor(Color.BLUE); g.drawLine(0, 0, 300, 400); jPanel1.add(l); } // end of jButton1_ActionPerformed public void jButton2_ActionPerformed(ActionEvent evt) { // TODO add your code here } // end of jButton2_ActionPerformed // end methods public static void main(String[] args) { new Try_Panel("Try_Panel"); } // end of main } // end of class Try_Panel </code></pre> <p>The biggest problem is the same code worked in my other class. </p>
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    1. USmaddy
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    1. COwhat is not working? why you aren't using `SwingUtilities.invokeLater()`?
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      1. USNikolay Kuznetsov
    2. CO*"The biggest problem is.."* I was about to finish that with "..I forget to ask a question" but then I got looking at that code. 1) Don't extend frame, just use an instance. 2) ***Use a layout manager!*** 3) Learn common [Java naming conventions](http://java.sun.com/docs/books/jls/second_edition/html/names.doc.html#73307) (specifically the case used for the names) for class, method & attribute names & use it consistently. 4) Don't center the frame like a splash, instead `setLocationByPlatform(true)` 5) Call `pack()` on the frame rather than set a size. 6) What happens instead of 'working'?
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      1. USAndrew Thompson
 

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