imageIcons... JPanels.... JLabels... help?
Hello all.
I am a noobie at this stuff (just to let y'all kno) and I'm having a hard time drawing/painting an ImageIcon on a JPanel. I'm not really sure, but I think it has something to do with the fact that the Graphics class is abstract (so obviously I can't make an instance of it) and therefore I can't pass a graphics object in a parameter without getting a NullPointerException or compiler error saying "g" has not been initialised.
here's part of the code:
ImageIcon image = new ImageIcon("C:\\marble.JPEG", "a marble");
JLabel background = new JLabel(image);
container.add(background, BorderLayout.CENTER);
Any help would be greatly appreciated. :-)
[706 byte] By [
lunelotea] at [2007-10-2 21:15:44]
don't know what you're trying to do with the Graphics object
this is all you need
import java.awt.*;
import javax.swing.*;
class Testing extends JFrame
{
public Testing()
{
setLocation(400,300);
setDefaultCloseOperation(EXIT_ON_CLOSE);
JPanel p = new JPanel();
JLabel lbl = new JLabel(new ImageIcon("C:\\Test.jpg","a marble"));
p.add(lbl);
getContentPane().add(p);
pack();
}
public static void main(String[] args){new Testing().setVisible(true);}
}
> getContentPane().add(p);
if you are using java 1.5+, all you need is
add(p);
but for java versions < 1.5, the getContentPane() is required:
getContentPane().setLayout(...);
getContentPane().add(...);
> pack();
[url]http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Window.html#pack()[/url]
Not to be too terribly annoying, but if I wanted it to print the picture after a button click (so in the actionPerformed() method... check that) how would that work?.. I tried putting the code in it's own little method and then calling that up when the button is clicked, but there's no picture anymore.... :-(
mmm.. k that went way over my head.... maybe *print* isn't the right word.... like *draw* perhaps? basically i want to get the picture to show up when a certain button is clicked (ok... maybe further explanation would help. i'm making a mancala programme and when the "play" button is clicked i would like the board picture to show up...)
thank you so much tho... actually getting the picture to show up after being very frustrated for a week was a nice change... even if it's not perfectly working;-)
the method you need is
setIcon()
here's the earlier code, modified for the image to show after clicking the button
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Testing extends JFrame
{
public Testing()
{
setSize(600,400);//needs a size, otherwise frame will be very small (label is empty)
setLocation(300,100);
setDefaultCloseOperation(EXIT_ON_CLOSE);
JPanel p = new JPanel();
final JLabel lbl = new JLabel();
p.add(lbl);
getContentPane().add(p,BorderLayout.CENTER);
JButton btn = new JButton("Show Image");
getContentPane().add(btn,BorderLayout.SOUTH);
btn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
lbl.setIcon(new ImageIcon("C:\\Test.jpg","a marble"));
pack();//will change the size of the frame, comment out and experiment
}});
}
public static void main(String[] args){new Testing().setVisible(true);}
}
