Question

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Convert a Graphics2D to an Image or BufferedImage

Sorry. This is a very basic question. But I am very new to this platform. I am drawing a line using graphics2d draw function. I want to save this as an image into my system. I googled it out and found out that BufferedImage class is useful in doing this and then use imagedraw function.

But I could not figure out how exactly use it in my code. Can any one please help me?

Here is my code.

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.event.*;
import java.awt.geom.Line2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class DrawAndSaveImage extends JApplet {
    public void init() {
        setBackground(Color.lightGray);
    }

public void paint(Graphics g) {
    Graphics2D g2d = (Graphics2D) g;
    g2d.setPaint(Color.black);
    g2d.draw(new Line2D.Double(50,150,150,150 ));

}

public static void main(String s[]) {
    JFrame frame = new JFrame("sample image");
    JApplet applet = new DrawAndSaveImage();
    frame.getContentPane().add("Center", applet);
    applet.init();
    frame.setSize(200, 200);
    frame.show();
}
}

Answer 1

1. JFrame and main are not supposed to be used in an applet, unless you try to create hybrid application.

2. Don’t override paint() method

3. Use SwingUtilities.invokeLater() to create GUI

4. Applet is not allowed to write/read from external files, unless it is signed

5. ImageIO.write() can write an image to file