BufferedImage extension
Why is the following code showing a black image instead of an image? How do I properly extend the BufferedImage?
class SizeOfImage {
public static void main(String[] args) throws Exception {
URL url = new URL("http://cloudbite.co.uk/wp-content/uploads/2011/03/google-chrome-logo-v1.jpg");
final BufferedImage bi = ImageIO.read(url);
final String size = bi.getWidth() + "x" + bi.getHeight();
final CustomImg cstImg = new CustomImg(bi.getWidth(), bi.getHeight(), bi.getType());
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JLabel l = new JLabel(size, new ImageIcon(cstImg), SwingConstants.RIGHT);
JOptionPane.showMessageDialog(null, l);
}
});
}
public static class CustomImg extends BufferedImage {
public CustomImg(int width, int height, int type){
super(width, height, type);
}
}
}
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2 answers
import java.awt.image.BufferedImage;
import java.awt.Graphics;
import javax.swing.*;
import javax.imageio.ImageIO;
import java.net.URL;
class SizeOfImage {
public static void main(String[] args) throws Exception {
URL url = new URL(
"http://cloudbite.co.uk/wp-content/" +
"uploads/2011/03/google-chrome-logo-v1.jpg");
BufferedImage bi = ImageIO.read(url);
final String size = bi.getWidth() + "x" + bi.getHeight();
final CustomImg cstImg = new CustomImg(
bi.getWidth(),
bi.getHeight(), bi.
getType());
// paint something to the new image!
Graphics g = cstImg.createGraphics();
g.drawImage(bi,0,0,null);
g.dispose();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JLabel l = new JLabel(
size,
new ImageIcon(cstImg),
SwingConstants.RIGHT );
JOptionPane.showMessageDialog(null, l);
}
});
}
public static class CustomImg extends BufferedImage {
public CustomImg(int width, int height, int type){
super(width, height, type);
}
}
}
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Maybe because the uploaded image is bi
never drawn on cstImg
.
This line:
CustomImg cstImg = new CustomImg(bi.getWidth(), bi.getHeight(), bi.getType());
creates a new image based on width, height and type bi
... not content bi
. To do this, you probably want to do something like
cstImg.getGraphics().drawImage(bi, 0, 0, null);
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