Das Laden und Anzeigen des Bildes ist kein Problem, aber wenn ich versuche, daraus ein Binärbild zu erstellen, erzeugt die repaint()-Methode ein schwarzes Bild auf dem Bildschirm.
Ich denke, das Problem liegt bei der repaint()-Methode. Ich habe bereits die Suchfunktion und Google verwendet, aber ich habe immer noch keine Ahnung, was in meinem Code falsch ist.
Das habe ich bisher:
Code: Select all
public class ImageProcessing extends JFrame implements ActionListener {
private JPanel imagePanel;
private JPanel buttonPanel;
private JButton binaryButton;
private JButton loadButton;
private BufferedImage image;
private final String WINDOW_TITLE = "Image Processing";
public ImageProcessing() {
createWindow();
}
private void createWindow() {
this.setTitle(WINDOW_TITLE);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(500, 500);
imagePanel = new ImagePanel();
buttonPanel = new JPanel();
this.add(imagePanel, BorderLayout.CENTER);
loadButton = new JButton("Load image");
loadButton.addActionListener(this);
buttonPanel.add(loadButton);
this.add(buttonPanel, BorderLayout.SOUTH);
binaryButton = new JButton("binary");
binaryButton.addActionListener(this);
buttonPanel.add(binaryButton);
this.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == this.loadButton) {
String filePath = getImageFile();
if (filePath != null) {
try {
image = ImageIO.read(new File(filePath));
// imageBackup = image;
} catch (IOException e1) {
e1.printStackTrace();
}
this.repaint();
}
} else if (e.getSource() == this.binaryButton) {
image = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_BYTE_BINARY);
imagePanel = new ImagePanel();
this.repaint();
}
}
private String getImageFile() {
JFileChooser chooser = new JFileChooser();
int result = chooser.showOpenDialog(null);
File file = null;
if (result == JFileChooser.APPROVE_OPTION) {
file = chooser.getSelectedFile();
return file.getPath();
} else
return null;
}
class ImagePanel extends JPanel {
public void paint(Graphics g) {
g.drawImage(image, 0, 0, this);
}
}
}
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