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Thread: What is the absolute easiest way to display an image in Swing?

  1. #1
    MW130 is offline Senior Member
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    Default What is the absolute easiest way to display an image in Swing?

    The easiest way you guys know to display an image on a JFrame. If you can, please provide example code.

  2. #2
    jim829 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    First, don't do it in a JFrame, do it in a JPanel which is then added to a JFrame. I would use ImageIO to read in an image. Then just override paintComponent in your JPanel and use the drawImage() method of the Graphics context (e.g. g.drawImage(imageBuf, 0, 0, null). You may need to scale the image to fit the panel.

    Regards,
    Jim
    The JavaTM Tutorials | SSCCE | Java Naming Conventions
    Poor planning on your part does not constitute an emergency on my part

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    MW130 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Ok Jim, Got it. I know how to do the g.drawImage part, but how do you use the ImageIO to read the image? What would the code be?
    I know how to draw the image within the paintComponent, but I am not quite sure how to scan and receive it with ImageIO.

  4. #4
    Daryn is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Did a google search came up with this Reading/Loading an Image (The Java™ Tutorials > 2D Graphics > Working with Images) hope its helpful
    With the right know how, anything is possible

  5. #5
    MW130 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Ok, I followed that tutorial. I didn't get any errors, but the image does not display.
    Here is my code:
    Sorry for the scrambled in keyEvents part
    Java Code:
    import java.awt.BorderLayout;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import java.awt.Image;
    
    import javax.imageio.ImageIO;
    import javax.swing.ImageIcon;
    import javax.swing.JPanel;
    import java.awt.Color;
    import java.awt.Component;
    import java.awt.Graphics;
    import java.awt.event.KeyEvent;
    import java.awt.event.KeyListener;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.util.Timer;
    import javax.swing.JComponent;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    import java.util.*;
     
        public class myGame extends JComponent {
        public int w = 400;
        public int z = 400;
        Random ar = new Random();
        public int x = ar.nextInt(400);
        Random har = new Random();
        public int y = har.nextInt(400);
        Random r = new Random();
        Random rand = new Random();
        Random newx;
        Random newy;
        int resetTimes = 0;
        int ex = r.nextInt(400);
        int why = rand.nextInt(400);
        Image petergriffin;
        public void drawImg(){
        	BufferedImage petergriffin = null;
        	try {
        	    petergriffin = ImageIO.read(new File("Users/MWaldman/Downloads/petergriffin.png"));
        	} catch (IOException e) {
        	}
        }
        
        public void ResetIt(){
        	if(x <= ex+17.5 && y <= why+17.5 && x >= ex-17.5 && y >= why-17.5){
        	    
        		newx = new Random();
        		newy = new Random();
        		int newex = newx.nextInt(450);
        	    int newwhy = newy.nextInt(450);
        		x = newex;
        		y = newwhy;
        		resetTimes++;
        		repaint();
        		
        	}
        }
        KeyListener kw = new KeyListener(){
    
    		@Override
    		public void keyTyped(KeyEvent e) {
    			// TODO Auto-generated method stub
    			
    		}
    
    		@Override
    		public void keyPressed(KeyEvent e) {
            int k = e.getKeyCode();
            if (k == KeyEvent.VK_W){
    	    y=y-10;
    	    repaint();
    	    ResetIt();
    
            }
            if (k == KeyEvent.VK_S){
            	y = y+10;
            	repaint();
        	    ResetIt();
    
            }
            if(k == KeyEvent.VK_A){
        	    x=x-10;
        	    repaint();
        	    ResetIt();
    
            }
        	if(k == KeyEvent.VK_D) {
        	    x=x+10;
        	    repaint();
        	    ResetIt();
        	            }
        };
            
    		
    
    		@Override
    		public void keyReleased(KeyEvent e) {
    			// TODO Auto-generated method stub
    			
    		}
        	
        
        };
        myGame() {
            JFrame f = new JFrame("SquareMove 1.0");
            JPanel p = new JPanel();
            p.setLayout(new BorderLayout());
            p.add(this);
            f.add(p);
            f.setSize(500, 500);
            f.setVisible(true);
            JLabel l = new JLabel("Users/MW/Downloads/petergriffin.png");
            p.add(l);
            f.add(l);
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.addKeyListener(kw);
            p.setBackground(Color.blue);
            
        }
     
        public void paintComponent(Graphics g) {
            g.fillRect(x, y, 50, 50);
            g.drawRect(ex, why,70,70);
            g.drawString("enter",ex,why);
            g.setColor(Color.white);
            g.drawString("Use WASD to move around", 150, 20);
            petergriffin = new ImageIcon("Users/MW/Downloads/petergriffin.png").getImage();
    		g.drawImage(petergriffin,x,y,null);
    		if(resetTimes > 5 && resetTimes <8){
    			g.drawString("Welcome to level two", 20, 50);
    		}
    		if(resetTimes>8& resetTimes<20){
    			g.drawString("Welcome to level three",20,50);
    		}
        }
     
    
        public static void main(String[] args) {
            myGame d = new myGame();
            d.drawImg();
            d.ResetIt();
        	new myGame();
        }
     
    }

  6. #6
    MW130 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Is it maybe because it is not being added to the panel?

  7. #7
    MW130 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    bump, anyone?
    :(

  8. #8
    jim829 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    If you have never done it before and it isn't working in your primary app then you need to step back and create a small app that does nothing but read in and display an image. No listeners, just read and display. If that doesn't work, then post your code (<20 lines) and someone may be able to help.

    Edit: < 40 lines.

    Regards,
    Jim
    Last edited by jim829; 01-16-2014 at 09:22 AM.
    The JavaTM Tutorials | SSCCE | Java Naming Conventions
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    JosAH's Avatar
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Quote Originally Posted by MW130 View Post
    Java Code:
        Image petergriffin;
        public void drawImg(){
        	BufferedImage petergriffin = null;
        	try {
        	    petergriffin = ImageIO.read(new File("Users/MWaldman/Downloads/petergriffin.png"));
        	} catch (IOException e) {
        	}
        }
    That is so not done and you should know it ...

    kind regards,

    Jos
    cenosillicaphobia: the fear for an empty beer glass

  10. #10
    JosAH's Avatar
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    Default Re: What is the absolute easiest way to display an image in Swing?

    @OP: I removed your duplicate thread; stay in one single thread for one single question; you should've known it ...

    kind regards,

    Jo
    cenosillicaphobia: the fear for an empty beer glass

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    gimbal2 is offline Just a guy
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Hm, I'm missing a call to super.paintComponent(), but perhaps that is not a problem if you extend JComponent directly.

    What I would do: I would create a class that extends JPanel and override its paintComponent, then add that JPanel to my JFrame. Its a simpler hierarchy than what you have now. But I would only do that if simply creating an ImageIcon and sticking it in a JLabel would not satisfy the requirements of course.
    "Syntactic sugar causes cancer of the semicolon." -- Alan Perlis

  12. #12
    jim829 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Nope. You're initial comment is correct! JPanel doesn't override paintComponent so the call is still needed. Of course I know that from looking at the source code. And since the Javadoc only mentions the originator of the method, JPanel could be changed to override paintComponent in the future and we might never know. It's interesting to note that in some cases a class will override a method in the parent only to simply call the parent method. And in other cases, we are to use the parent method directly.

    Regards,
    Jim
    The JavaTM Tutorials | SSCCE | Java Naming Conventions
    Poor planning on your part does not constitute an emergency on my part

  13. #13
    MW130 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    I wrote this code solely to display the image, but I am still having the same error. Program opens up, but does not display anything

    Here is what I tried:

    Java Code:
     import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import javax.imageio.ImageIO;
    import javax.swing.*;
    
    
    
    public class DisplayImage extends JPanel {
    	Image petergriffin;
    	public void drawImg(){
    	    BufferedImage petergriffin = null;
    	    try {
    	        petergriffin = ImageIO.read(new File("Users/MW/Downloads/petergriffin.png"));
    	    } catch (IOException e) {
    	    }
    	}
    	public void paintComponent(Graphics g){
    		g.drawImage(petergriffin,150,150,null);
    	}
    	
    	
    	public static void main(String[] args) {
        JFrame f = new JFrame("Peter Griffin");
        f.setSize(500,500);
        f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
    	}
    
    }

  14. #14
    MW130 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Ok, I tried a few more things but to no avail
    Java Code:
     import java.awt.BorderLayout;
    import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import javax.imageio.ImageIO;
    import javax.swing.*;
    
    
    
    public class DisplayImage extends JPanel {
    	private BufferedImage image;
    	public DisplayImage(){
    		try{
    			image = ImageIO.read(new File("Users/MWaldman/Downloads/petergriffin.png"));
    		} catch(Exception e){}
    	}
    	public void paintComponent(Graphics g){
    		super.paintComponent(g);
    		g.drawImage(image,0,0,null);
    	}
    	public void setUp(){
    		 JFrame f = new JFrame("Peter Griffin");
    		    f.setSize(500,500);
    		    f.setVisible(true);
    		    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		    JPanel p = new JPanel();
    		    f.add(p);
    		    p.add(this);
    		    p.setLayout(new BorderLayout());
    	}
    	
    	public static void main(String[] args) {
       DisplayImage l = new DisplayImage();
       l.setUp();
        
    	}
    
    }
    Last edited by MW130; 01-16-2014 at 05:41 PM.

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    gimbal2 is offline Just a guy
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Yes, but no DisplayImage instance is added to the frame anywhere. So that is absolutely no mystery. ninja'd by the OP, this is no longer relevant.

    And if after you actually properly build the GUI hierarchy and it still doesn't work, the loading of the image may also fail if the path is not correct (and as it is now, that is very likely depending on where you run the application), but since you throw away the exception you would never know it.
    "Syntactic sugar causes cancer of the semicolon." -- Alan Perlis

  16. #16
    MW130 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    How would I add an instance of DisplayImage to the frame? I tried making a DisplayImage object but it says cannot be resolved

  17. #17
    gimbal2 is offline Just a guy
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Okay a few remarks on your last code that I unfortunately did not see when I wrote my previous reply.

    Java Code:
    JPanel p = new JPanel();
    f.add(p);
    You add things to the content pane of the frame, not the frame itself. And since the content pane has a BorderLayout by default, you should tell it where you want to add it. Like this:

    Java Code:
    f.getContentPane().add(p, BorderLayout.CENTER);
    Continuing:
    Java Code:
    p.add(this);
    Why do you need a second panel since your DisplayImage is also a JPanel itself? Now you have a panel in a panel in the frame. You understand what 'this' represents don't you?

    Java Code:
    p.setLayout(new BorderLayout());
    I would set the layout first (for example, by passing it to the constructor of the JPanel) and THEN add the components, especially because now you are using a BorderLayout for the panel so you should again tell where in the panel the stuff needs to be added.

    How to Use BorderLayout (The Java™ Tutorials > Creating a GUI With JFC/Swing > Laying Out Components Within a Container)


    And my previous comment on the loading of the image which you are ignoring for now might still be another reason for the image not showing up.

    And if after you actually properly build the GUI hierarchy and it still doesn't work, the loading of the image may also fail if the path is not correct (and as it is now, that is very likely depending on where you run the application), but since you throw away the exception you would never know it.
    Last edited by gimbal2; 01-16-2014 at 06:00 PM.
    "Syntactic sugar causes cancer of the semicolon." -- Alan Perlis

  18. #18
    MW130 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Gimbal, I don't know how to add the instance because I tried creating an object from this class and adding it to the panel but it says this cannot be resolved. I am not ignoring your answer, I just don't know how to implement it

  19. #19
    gimbal2 is offline Just a guy
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Read my replies again, you are very mistaken.
    "Syntactic sugar causes cancer of the semicolon." -- Alan Perlis

  20. #20
    MW130 is offline Senior Member
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    Default Re: What is the absolute easiest way to display an image in Swing?

    Gimbal, I really don't mean to make you upset. I am just really confused about what to do.. I did read your replies, and I still am not sure how to handle it. If it helps, I set the try method to handle the exception by displaying error, which it is doing. I don't know why it is not reading the image, since I checked and it is indeed the correct path. Again, sorry for my lack of skill :( . If you no longer want to help, I do understand.
    Thanks
    (in case it is needed, here is my code now)
    Java Code:
     import java.awt.BorderLayout;
    import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import javax.imageio.ImageIO;
    import javax.swing.*;
    
    
    
    public class DisplayImage extends JPanel {
    	private BufferedImage image;
    	public DisplayImage(){
    		try{
    			image = ImageIO.read(new File("petergriffin.png"));
    		} catch(Exception e){System.out.println("Error");}
    	}
    	public void paintComponent(Graphics g){
    		super.paintComponent(g);
    		g.drawImage(image,0,0,null);
    	}
    	public void setUp(){
    		 JFrame f = new JFrame("Peter Griffin");
    		    f.setSize(500,500);
    		    f.setVisible(true);
    		    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		    JPanel p = new JPanel();
    		    f.add(p);
    		    p.setLayout(new BorderLayout());
    }
    	
    	public static void main(String[] args) {
       DisplayImage l = new DisplayImage();
       l.setUp();
        
    	}
    
    }

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