Adding fixed size picture and button to panel

**Javabeginner** · August 23rd, 2010, 03:35 PM

I need to make a JPanel that contains picture and JButton. JButton should contain an actionListener and when user clicks on it JFileChooser opens and user can select picture and change that one (already being there in JPanel). I can do this one easily (adding picture to JLabel ...) but picture size MUST be fixed( in JLabel it is painted in its originial size) How can I achieve this ? Any advice ?

**copeg** · August 23rd, 2010, 03:58 PM

Rather than use a JLabel, you can draw the image directly to a JPanel (in the paintComponent method, using the Graphics object drawImage).First load the image using ImageIO, and you can then resize the image using the Image method getScaledInstance. If much of this doesn't make much sense I'd encourage you to read the following: Trail: 2D Graphics (The Java™ Tutorials)

**Darryl.Burke** · August 23rd, 2010, 04:04 PM

Load the image as a BufferedImage using ImageIO#read(...) and construct an ImageIcon with a scaled instance of the image.

db

**Javabeginner** · August 23rd, 2010, 04:14 PM

Thanks for replies.

copeg How can I then add Button to the panel. When I add it,for example

panel.add(new JButton("ok", BorderLayout.SOUTH)

it is displayed over image?

**copeg** · August 23rd, 2010, 04:29 PM

Leave it up to me to make things more complex than they should be...db's suggestion would be MUCH easier. However, if you wish to draw the images on a JPanel, you can to create a few panels and then add them to a third: eg you would have 3 panels: 1) draws the image 2) holds the button 3) both 1 and 2 are added to this panel and this panel is then added to the JFrame content pane. To try and anticipate another question: if at that point you wish to alter the way the components are displayed, take a look at this: A Visual Guide to Layout Managers

**Javabeginner** · August 23rd, 2010, 04:55 PM

That is exactly what I did copeg but it does not work properly. Here is code (just change file address to point to some real picture in your documents).

iimport javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
 
 
class PicturePanel extends JPanel{
 
	private BufferedImage b ;
 
	public PicturePanel() throws IOException{
		 b=ImageIO.read(new File("C:\\Pictures\\Flag.jpg"));
		 this.setMinimumSize(new Dimension(300,300));
 
	}
 
	protected void paintComponent(Graphics g){
		super.paintComponents(g);
		Graphics2D g2=(Graphics2D)g;
		g2.drawImage(b, 0, 0, 200, 200, null);
	}
}
 
public class Scales{
 
	public static void main(String[] args) throws IOException{
 
 
		JFrame f=new JFrame();
 
		JPanel mainPanel=new JPanel();
		mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
 
		PicturePanel p=new PicturePanel();
		mainPanel.add(p);
 
		JPanel buttonPanel=new JPanel();
		buttonPanel.add(new JButton("Change Picture"));
		mainPanel.add(buttonPanel);
 
		f.setVisible(true);
		f.add(mainPanel);
		f.pack();
 
	}
}

**Brt93yoda** · August 23rd, 2010, 05:04 PM

Try surrounding your code in [highlight=java] code here [/highlight] tags

**copeg** · August 23rd, 2010, 05:16 PM

What do you mean 'doesn't work properly'? (btw could be just a copy/paste error but the top import will give a compile time error)

**Javabeginner** · August 23rd, 2010, 05:21 PM

I mean, there is no syntax error It does not show picture completely Just part of it is showed and immediatly below JButton (try to run it with some real "big Size" image ( not small icon or similar)).

**copeg** · August 23rd, 2010, 05:45 PM

Try calling setPreferredSize() on the image JPanel.

**Javabeginner** · August 23rd, 2010, 06:07 PM

That works . Thanks a lot for help.

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