JTextPane coordinates to take a screenshot in Java

Question

I hope someone can help me, this is what I want to do.

I have a JTextPane and I want to take a screenshot for these specific coordinates and JTextPane size, while I can take a screenshot with JTextPane size, but I can not get the specific coordinates that my screenshots always get (0,0).

This is my method:

void capturaPantalla () { try { int x = txtCodigo.getX(); int y = txtCodigo.getY(); Rectangle areaCaptura = new Rectangle(x, y, txtCodigo.getWidth(), txtCodigo.getHeight()); BufferedImage capturaPantalla = new Robot().createScreenCapture(areaCaptura); File ruta = new File("P:\\captura.png"); ImageIO.write(capturaPantalla, "png", ruta); JOptionPane.showMessageDialog(null, "Codigo de barras guardado!"); } catch (IOException ioe) { System.out.println(ioe); } catch(AWTException ex) { System.out.println(ex); } } 

Answer 1

When you call getX() and getY() on any Swing component, you get x and y relative to the component container, not the screen . Instead, you want the component’s location relative to the screen and get a position based on this through getLocationOnScreen()

 Point p = txtCodigo.getLocationOnScreen(); int x = px; int y = py; 

According to MadProgrammer's comment, you can simply call printAll(Graphics g) on your txtCodigo component, passing in the Graphics object obtained from the BufferedImage with the appropriate size and stop using the robot.

 Dimension d = txtCodigo.getSize(); BufferedImage img = new BufferedImage(d.width, d.height, BufferedImage.TYPE_INT_ARGB); Graphics g = img.getGraphics(); txtCodigo.printAll(g); g.dispose(); // use ImageIO to write BufferedImage to file 

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For comparison with two methods:

 import java.awt.AWTException; import java.awt.BorderLayout; import java.awt.Component; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Point; import java.awt.Rectangle; import java.awt.Robot; import java.awt.event.ActionEvent; import java.awt.image.BufferedImage; import java.util.Random; import javax.swing.*; @SuppressWarnings("serial") public class RobotVsPrintAll extends JPanel { private static final int WORDS = 400; private JTextArea textArea = new JTextArea(20, 40); private JScrollPane scrollPane = new JScrollPane(textArea); private Random random = new Random(); public RobotVsPrintAll() { StringBuilder sb = new StringBuilder(); for (int i = 0; i < WORDS; i++) { int wordLength = random.nextInt(4) + 4; for (int j = 0; j < wordLength; j++) { char myChar = (char) (random.nextInt('z' - 'a' + 1) + 'a'); sb.append(myChar); } sb.append(" "); } textArea.setText(sb.toString()); textArea.setLineWrap(true); textArea.setWrapStyleWord(true); scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); JButton robot1Btn = new JButton(new Robot1Action("Robot 1")); JButton robot2Btn = new JButton(new Robot2Action("Robot 2")); JButton printAllBtn = new JButton(new PrintAllAction("Print All")); JPanel btnPanel = new JPanel(); btnPanel.add(robot1Btn); btnPanel.add(robot2Btn); btnPanel.add(printAllBtn); setLayout(new BorderLayout()); add(scrollPane, BorderLayout.CENTER); add(btnPanel, BorderLayout.PAGE_END); } private void displayImg(BufferedImage img) { ImageIcon icon = new ImageIcon(img); JOptionPane.showMessageDialog(this, icon, "Display Image", JOptionPane.PLAIN_MESSAGE); } private class Robot1Action extends AbstractAction { public Robot1Action(String name) { super(name); int mnemonic = (int) name.charAt(0); putValue(MNEMONIC_KEY, mnemonic); } @Override public void actionPerformed(ActionEvent e) { try { Component comp = scrollPane.getViewport(); Point p = comp.getLocationOnScreen(); Dimension d = comp.getSize(); Robot robot = new Robot(); Rectangle screenRect = new Rectangle(px, py, d.width, d.height); BufferedImage img = robot.createScreenCapture(screenRect); displayImg(img); } catch (AWTException e1) { e1.printStackTrace(); } } } private class Robot2Action extends AbstractAction { public Robot2Action(String name) { super(name); int mnemonic = (int) name.charAt(0); putValue(MNEMONIC_KEY, mnemonic); } @Override public void actionPerformed(ActionEvent e) { try { Component comp = textArea; Point p = comp.getLocationOnScreen(); Dimension d = comp.getSize(); Robot robot = new Robot(); Rectangle screenRect = new Rectangle(px, py, d.width, d.height); BufferedImage img = robot.createScreenCapture(screenRect); displayImg(img); } catch (AWTException e1) { e1.printStackTrace(); } } } private class PrintAllAction extends AbstractAction { public PrintAllAction(String name) { super(name); int mnemonic = (int) name.charAt(0); putValue(MNEMONIC_KEY, mnemonic); } public void actionPerformed(ActionEvent e) { Dimension d = textArea.getSize(); BufferedImage img = new BufferedImage(d.width, d.height, BufferedImage.TYPE_INT_ARGB); Graphics g = img.getGraphics(); textArea.printAll(g); g.dispose(); displayImg(img); } } private static void createAndShowGui() { RobotVsPrintAll mainPanel = new RobotVsPrintAll(); JFrame frame = new JFrame("Robot Vs PrintAll"); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); frame.getContentPane().add(mainPanel); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } } 

If you print a text component using printAll, you get the entire text component, even parts that do not appear in the JScrollPane viewport.

Answer 2

You can use the Screen Image class, which does all the work for you. All you do is specify the component that you want to capture.

The code:

 BufferedImage bi = ScreenImage.createImage( component ); 

And you can save the image to a file using:

 ScreenImage.writeImage(bi, "imageName.jpg"); 

This class will use the Swing component drawing method, which is more efficient than using a robot.