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Thread: my jtable image dosen't appear

  1. #1
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    Default my jtable image dosen't appear

    Greeting all,
    i want to convert the JTable to an Image using the method "createImage", but the jtable image doesn't appears i tried to figure out but no result at all..
    thanks for any help.


            public class JTableImageCreator extends JPanel
    {
         public JTableImageCreator() {
            setBorder(BorderFactory.createLineBorder(Color.black));
        }
     
           public Dimension getPreferredSize() {
            return new Dimension(250,200);
        }
     
          public void paintComponent(Graphics2D g) {
            super.paintComponent(g);       
           BufferedImage table = createImage(getTable());
            g.drawImage(table, 0, 0, 100, 100 , null);
        }   
     
     
     
     
        public JTable getTable()
        {
         String[] columns = {"ColumnA", "ColumnB", "ColumnC"};
     
     
               Object[][] data = {
                  {"A", new Integer(60), new Boolean(true)},
                  {"B", new Integer(60), new Boolean(true)},
                  {"C", new Integer(60), new Boolean(true)},
                  {"D", new Integer(60), new Boolean(true)} };
     
        return new JTable(data,columns);
     
        }
     
        /**
         * This method takes a JTable and returns a BufferedImage of it
         * 
         * @param table 
         * @return BufferedImage of JTable
         */
        public static BufferedImage createImage(JTable table)
        {
            //get the table header component
            JTableHeader tableHeaderComp = table.getTableHeader();
     
            //Calculate the total width and height of thr table iwth the header
            int totalWidth = tableHeaderComp.getWidth() + table.getWidth();
            int totalHeight = tableHeaderComp.getHeight() + table.getHeight();
     
            //create a BufferedImage object of total width and height
            BufferedImage tableImage = new BufferedImage(totalWidth, totalHeight, BufferedImage.TYPE_INT_RGB);
     
            //get the graphics object from the image
            Graphics2D g2D = (Graphics2D)tableImage.getGraphics();
     
            //paint the table header on image graphics
            tableHeaderComp.paint(g2D);
     
            //now translate the origin to (0, height of table header)
            g2D.translate(0, tableHeaderComp.getHeight());
     
            //now paint the table on the image graphics
            table.paint(g2D);
     
            //return the table image
            return tableImage; 
        }
         public static void main(String[] args) {
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    createAndShowGUI(); 
                }
            });
        }
     
        private static void createAndShowGUI() {
            System.out.println("Created GUI on EDT? "+
            SwingUtilities.isEventDispatchThread());
            JFrame f = new JFrame("Swing Paint Demo");
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           // f.add(new JTableImageCreator());
            f.getContentPane().add(new JTableImageCreator());
            f.pack();
            f.setVisible(true);
        }
    }
    Last edited by Learner; September 22nd, 2011 at 11:05 AM.


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: my jtable image dosen't appear

    That is NOT the way to do painting. I suggest you read this: Lesson: Performing Custom Painting (The Java™ Tutorials > Creating a GUI With JFC/Swing)

    But really, what you're looking for is probably a table renderer. They are covered here: How to Use Tables (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)
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    Administrator copeg's Avatar
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    Default Re: my jtable image dosen't appear

    Check the methods you override - there is one in particular which is not actually overriding the parent method (eg paintComponent). For what its worth, using the @Override annotation would have caught this at compile time.

    I do hope this example was for demonstration purposes only - as while I don't see anything wrong with drawing to the BufferedImage portion of the code, drawing the JPanel is a different matter entirely - as recreating the table, changing the table to an image, and drawing said image for every call to paintComponent is not a great way to render the JTable in a JPanel.
    Last edited by copeg; September 22nd, 2011 at 11:28 AM.

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