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Making a buffered image of a JTable row
Rich West
Greenhorn
Posts: 2
posted 19 years ago
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Does anyone have any example code for making a buffered image of a row of a JTable?
Many thanks in advance.
Craig Wood
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Posts: 1535
posted 19 years ago
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import java.awt.*; import java.awt.event.*; import java.awt.image.BufferedImage; import java.io.*; import javax.imageio.ImageIO; import javax.swing.*; import javax.swing.event.*; import javax.swing.table.*; public class RowImage { public RowImage() { JTable table = createTable(); ActionController controller = new ActionController(table); JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.getContentPane().add(controller.getUIPanel(), "North"); f.getContentPane().add(new JScrollPane(table)); f.getContentPane().add(controller.getImagePanel(), "South"); f.setSize(400,400); f.setLocation(200,200); f.setVisible(true); controller.createImageOfRow(0); } private JTable createTable() { String[] headers = { "column 1", "column 2", "column 3", "column 4" }; int rows = 6, cols = 4; String[][] data = new String[rows][cols]; for(int row = 0; row < rows; row++) for(int col = 0; col < cols; col++) data[row][col] = "item " + (row * cols + col + 1); JTable table = new JTable(data, headers); table.setRowHeight(35); TableCellRenderer tcr = table.getDefaultRenderer(String.class); ((DefaultTableCellRenderer)tcr).setHorizontalAlignment(JLabel.CENTER); return table; } public static void main(String[] args) { new RowImage(); } } class ActionController { JTable table; JLabel label; BufferedImage bi; public ActionController(JTable table) { this.table = table; } public void createImageOfRow(int rowIndex) { int x = table.getX(); int y = table.getRowHeight() * rowIndex; int w = table.getWidth(); int h = table.getRowHeight(); bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = bi.createGraphics(); g2.translate(-x, -y); table.paint(g2); g2.dispose(); label.setIcon(new ImageIcon(bi)); } private void saveImage() { try { ImageIO.write(bi, "png", new File("tableRowImage.png")); } catch(IOException ioe) { System.err.println("write: " + ioe.getMessage()); } } public JPanel getUIPanel() { int rows = table.getRowCount() - 1; final SpinnerNumberModel model = new SpinnerNumberModel(0, 0, rows, 1); JSpinner spinner = new JSpinner(model); JSpinner.NumberEditor editor = new JSpinner.NumberEditor(spinner); editor.getTextField().setHorizontalAlignment(JTextField.CENTER); Dimension d = editor.getPreferredSize(); editor.setPreferredSize(new Dimension(25, d.height)); spinner.setEditor(editor); spinner.addChangeListener(new ChangeListener() { public void stateChanged(ChangeEvent e) { int rowIndex = model.getNumber().intValue(); createImageOfRow(rowIndex); } }); JButton save = new JButton("save"); save.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { saveImage(); } }); JPanel panel = new JPanel(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); gbc.insets = new Insets(3,2,3,2); gbc.weightx = 1.0; gbc.anchor = gbc.EAST; panel.add(new JLabel("row index"), gbc); gbc.anchor = gbc.WEST; panel.add(spinner, gbc); gbc.anchor = gbc.CENTER; panel.add(save, gbc); return panel; } public JPanel getImagePanel() { label = new JLabel(); label.setHorizontalAlignment(JLabel.CENTER); Dimension d = table.getPreferredSize(); d.height = table.getRowHeight(); label.setPreferredSize(d); JPanel panel = new JPanel(new BorderLayout()); panel.add(label); return panel; } }
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