I am programming a sprite editor and I would like to implement an Undo button to my program. In order to achieve that, I have thought to use an ArrayList that store my updated BufferedImage after each action in an ArrayList. Then I will just read the ArrayList and find the right image to draw thanks to an index. However, it seems like it always store the same image. I don't know what I am doing wrong so I am asking for your help and advice.
Here is a test code:
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;
@SuppressWarnings("serial")
public class FromGraphicsToBufferedImage extends JPanel{
private static final int BI_WIDTH = 600;
private static final int BI_HEIGHT = BI_WIDTH;
private static BufferedImage bImage = new BufferedImage(BI_WIDTH, BI_HEIGHT, BufferedImage.TYPE_INT_ARGB); //Enregistrement de l'image en RGBA
private List<Point> pointList = new ArrayList<Point>();
private JLabel imageLabel;
private boolean isInit = false;
private static ArrayList<BufferedImage> historic = new ArrayList<BufferedImage>();
private int historicIndex = 0;
//Constructeur
public FromGraphicsToBufferedImage() {
imageLabel = new JLabel(new ImageIcon(bImage)) {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
paintInLabel(g);
}
};
MyMouseAdapter myMouseAdapter = new MyMouseAdapter();
imageLabel.addMouseListener(myMouseAdapter);
imageLabel.addMouseMotionListener(myMouseAdapter);
imageLabel.setBorder(BorderFactory.createEtchedBorder());
JButton saveImageBtn = new JButton("Save Image");
saveImageBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
saveImageActionPerformed();
}
});
JButton clearImageBtn = new JButton("Clear Image");
clearImageBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Graphics2D g2 = bImage.createGraphics();
g2.setBackground(new Color(255,255,255,0));
g2.clearRect(0, 0, BI_WIDTH, BI_HEIGHT);
g2.dispose();
imageLabel.repaint();
}
});
JButton undo = new JButton("Undo");
undo.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("UNDO");
historicIndex -= 1;
bImage = historic.get(historicIndex);
Graphics2D g2 = bImage.createGraphics();
g2.drawImage(bImage, 0, 0, bImage.getWidth(), bImage.getHeight(), imageLabel);
g2.dispose();
imageLabel.setIcon(new ImageIcon(bImage));
imageLabel.repaint();
}
});
JPanel btnPanel = new JPanel();
btnPanel.add(saveImageBtn);
btnPanel.add(clearImageBtn);
btnPanel.add(undo);
setLayout(new BorderLayout());
add(imageLabel, BorderLayout.CENTER);
add(btnPanel, BorderLayout.SOUTH);
} //Fin du Constructeur
private void saveImageActionPerformed() {
JFileChooser filechooser = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter("PNG Images", "png");
filechooser.setFileFilter(filter);
int result = filechooser.showSaveDialog(this);
if (result == JFileChooser.APPROVE_OPTION) {
File saveFile = filechooser.getSelectedFile();
try {
ImageIO.write(bImage, "png", saveFile);
} catch (IOException e) {
e.printStackTrace();
}
}
}
private void paintInLabel(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d = bImage.createGraphics();
if(isInit == false) {
g2d.setColor(Color.RED);
g2d.fillRect(0, 0, BI_WIDTH, BI_HEIGHT);
g2d.dispose();
isInit = true;
}
else {
g2d.setColor(Color.BLUE);
if(pointList.size() == 0) {
return;
}
//System.out.println(bImage.getRGB(50, 50));
int x1 = pointList.get(0).x;
int y1 = pointList.get(0).y;
int x2 = pointList.get(0).x+32;
int y2 = pointList.get(0).y+32;
g2d.setComposite(AlphaComposite.Src);
g2d.setColor(new Color(255,255,255,0));
g2d.fillRect(x1,y1,32,32);
g2d.dispose();
pointList.clear();
}
historic.add(deepCopy(bImage));
imageLabel.repaint();
}
private class MyMouseAdapter extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
pointList.add(e.getPoint());
imageLabel.repaint();
}
@Override
public void mouseReleased(MouseEvent e) {
//historic.add(deepCopy(bImage));
System.out.println("Historic Size: " + historic.size());
int tailleHistorique = historic.size();
historicIndex = tailleHistorique-1;
if(historic.size() >= 2) {
System.out.println("The 2 images are the same: " + compareImages(historic.get(historicIndex-1), historic.get(historicIndex)));
}
}
}
private static void createAndShowUI() {
JFrame frame = new JFrame("DrawAndSaveImage");
frame.getContentPane().add(new FromGraphicsToBufferedImage());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static BufferedImage getBufferedImage() {
return bImage;
}
public static boolean compareImages(BufferedImage imgA, BufferedImage imgB) {
if (imgA.getWidth() == imgB.getWidth() && imgA.getHeight() == imgB.getHeight()) {
int largeurImage = imgA.getWidth();
int hauteurImage = imgA.getHeight();
for (int y = 0; y < hauteurImage; y++) {
for (int x = 0; x < largeurImage; x++) {
if (imgA.getRGB(x, y) != imgB.getRGB(x, y)){
return false;
}
}
}
}
else {
return false;
}
return true;
}
static BufferedImage deepCopy(BufferedImage bi) {
ColorModel cm = bi.getColorModel();
boolean isAlphaPremultiplied = cm.isAlphaPremultiplied();
WritableRaster raster = bi.copyData(null);
return new BufferedImage(cm, raster, isAlphaPremultiplied, null);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
}
});
}
}
