Mega Code Archive
Save Your Drawing To a File
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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Panel;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
import javax.swing.JButton;
import javax.swing.JFrame;
public class SaveYourDrawingToFile extends JFrame implements MouseListener, ActionListener {
List<Point> displayList = new ArrayList<Point>();
String pathname = "data.dat";
JButton clearBtn = new JButton("Clear");
JButton saveBtn = new JButton("Save");
JButton restoreBtn = new JButton("Restore");
JButton quitBtn = new JButton("Quit");
public static void main(String args[]) {
SaveYourDrawingToFile that = new SaveYourDrawingToFile();
that.setVisible(true);
}
public SaveYourDrawingToFile() {
addMouseListener(this);
setLayout(new BorderLayout());
Panel pan = new Panel();
clearBtn.addActionListener(this);
pan.add(clearBtn);
saveBtn.addActionListener(this);
pan.add(saveBtn);
restoreBtn.addActionListener(this);
pan.add(restoreBtn);
quitBtn.addActionListener(this);
pan.add(quitBtn);
add("North", pan);
setSize(350, 200);
}
public void paint(Graphics g) {
g.setColor(Color.white);
g.fillRect(0, 0, getSize().width, getSize().height);
g.setColor(Color.black);
int i = 0;
while (i < displayList.size()) {
Point p0 = (Point) (displayList.get(i++));
Point p1 = (Point) (displayList.get(i++));
int x = Math.min(p0.x, p1.x);
int y = Math.min(p0.y, p1.y);
int w = Math.abs(p0.x - p1.x);
int h = Math.abs(p0.y - p1.y);
g.drawRect(x, y, w, h);
}
}
public void mousePressed(MouseEvent e) {
Point p = new Point(e.getX(), e.getY());
displayList.add(p);
}
public void mouseReleased(MouseEvent e) {
Point p = new Point(e.getX(), e.getY());
displayList.add(p);
repaint();
}
public void mouseClicked(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == clearBtn) {
displayList = new Vector();
repaint();
} else if (e.getSource() == saveBtn) {
try {
FileOutputStream fos = new FileOutputStream(pathname);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(displayList);
oos.flush();
oos.close();
fos.close();
} catch (Exception ex) {
System.out.println("Trouble writing display list vector");
}
} else if (e.getSource() == restoreBtn) {
try {
FileInputStream fis = new FileInputStream(pathname);
ObjectInputStream ois = new ObjectInputStream(fis);
displayList = (Vector) (ois.readObject());
ois.close();
fis.close();
repaint();
} catch (Exception ex) {
System.out.println("Trouble reading display list vector");
}
} else if (e.getSource() == quitBtn) {
setVisible(false);
dispose();
System.exit(0);
}
}
}
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