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New to Java - Need to display an image in a window using JAVA

Posted on 2013-12-10
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Last Modified: 2013-12-10
I am new to JAVA and have a project that manipulates images.  I am able to save the new image to a file but want to display it in a window on the screen.  Here is the code I am using.  The window opens but the image doesn't display.  Resultsimage is a BuffereImage that contains the new image.

                           Graphics g = resultsimage.getGraphics();
                           JFrame window = new JFrame("Image");
                           window.setBounds(0, 0, resultsimage.getWidth()+10, resultsimage.getHeight()+10);
                           window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                           g.drawImage(resultsimage, 5, 5, resultsimage.getWidth(), resultsimage.getHeight(), Color.WHITE, null);
                           window.setVisible(true);

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Any help is greatly appreciated.
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Question by:dyarosh
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Accepted Solution

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CEHJ earned 500 total points
ID: 39709074
                           JFrame window = new JFrame("Image");
                           window.setBounds(0, 0, resultsimage.getWidth()+10, resultsimage.getHeight()+10);
                           window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                           window.getContentPane().add(new JLabel(new ImageIcon(resultsimage)));
                           window.setVisible(true);
                                  

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Try the above instead
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LVL 13

Expert Comment

by:Ashok
ID: 39709079
try adding

protected void paintComponent(Graphics g)  {
        super.paintComponent(g);  
        g.drawImage(resultsimage, 5, 5, resultsimage.getWidth(), resultsimage.getHeight(), Color.WHITE, null);
}

then make a call to above passing g

paintComponent(g);
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LVL 13

Expert Comment

by:Ashok
ID: 39709098
import java.awt.Graphics2D;

.....

Graphics2D g2d = (Graphics2D) g.create();  
//Paint it on screen  
g2d.drawImage(resultsimage, 5, 5, resultsimage.getWidth(), resultsimage.getHeight(), Color.WHITE, null);
g2d.dispose();
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LVL 13

Expert Comment

by:Ashok
ID: 39709130
If you understand little Java, here is lot of good stuff with graphic.

http://www.ntu.edu.sg/home/ehchua/programming/java/J8b_Game_2DGraphics.html

I do not have Java code in front of me right now so I am not able to give you exact code.
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LVL 13

Expert Comment

by:Ashok
ID: 39709274
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.swing.JPanel;

public class TestPaintImage {

    public static void main(String[] args) {
        new TestPaintImage();
    }

    public TestPaintImage() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new ImagePane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class ImagePane extends JPanel {

        private BufferedImage background;

        public ImagePane() {
            try {
                background = ImageIO.read(new File("/path/to/your/image"));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public Dimension getPreferredSize() {
            return background == null ? super.getPreferredSize() : new Dimension(background.getWidth(), background.getHeight());
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            if (background != null) {
                int x = (getWidth() - background.getWidth()) / 2;
                int y = (getHeight() - background.getHeight()) / 2;
                g.drawImage(background, x, y, this);
            }
        }
    }
}

Test above first.  background is same as your resultsimage.
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LVL 13

Expert Comment

by:Ashok
ID: 39709330
Here is another helpful code.....

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import javax.swing.*;

public class test extends JPanel {
public test() {
setPreferredSize(new Dimension(400,300));
}

public void paintComponent(Graphics g) {
g.setColor(Color.WHITE);
g.fillRect(0,0,getWidth(),getHeight());
g.setColor(Color.GREEN);
g.drawLine(0,0,getWidth(),getHeight());
g.drawLine(getWidth(),0,0,getHeight());
}

public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final test t = new test();
f.add(t,BorderLayout.CENTER);
JButton b = new JButton("Save Image");
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
BufferedImage bi = new BufferedImage(
t.getWidth(),t.getHeight(),
BufferedImage.TYPE_INT_RGB);
Graphics2D g = bi.createGraphics();
t.paintComponent(g);
try {
ImageIO.write(bi,"JPEG",
new File("image.jpg"));
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
});
f.add(b,BorderLayout.SOUTH);
f.pack();
f.setVisible(true);
}
});
}
}
0
 
LVL 13

Expert Comment

by:Ashok
ID: 39709346
JPanel panel = new JPanel(){
        @Override
        public void paintComponent(Graphics g) {
            BufferedImage image = null; // get your buffered image.
            Graphics2D graphics2d = (Graphics2D) g;
            graphics2d.drawImage(image, 0, 0, null);
            super.paintComponents(g);
        }
    };
0
 

Author Closing Comment

by:dyarosh
ID: 39709413
THank you.  That worked for me.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 39709603
:)
0

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