Need Help with Loading couple images to a BufferedImage.

[Shikatsu]

Greetings EveryOne

I am making a board game, I want to load the board and the pieces with their current locations into a BufferedImage then paint the BufferedImage to the screen, is this a good aproch? if not can you show me a better one?

Here is the code that I came up with:

import java.applet.*;
import java.awt.*;
import java.awt.image.*;

public class ImageExampleWithBuffer extends Applet
{
    private int WinWidth  = 200;
    private int WinHeight = 200;
    
    Image IMG;
    
    BufferedImage BuffImg = new BufferedImage(50, 50, 
                                              BufferedImage.TYPE_INT_RGB);
    
    @Override
    public void init()
    {
        setSize(WinWidth, WinHeight);
        
        IMG = getImage(getDocumentBase(), "Smily.jpg");
        
        Graphics2D Graph = BuffImg.createGraphics();
        Graph.drawImage(IMG, 50, 50, this);
        
        repaint();
    }
    
    @Override
    public void paint(Graphics G)
    {
        G.drawImage(BuffImg, 50, 50, this);
    }
            
}

The output is a 50*50 black square, the image doesn't shows up, even it's in the same directory as the applet.

Please SomeOne Help, Thank You.

[SourCookie]

To load a image from a file enter in this code:

BufferedImage img = null;
try {
img = ImageIO.read(new File("strawberry.jpg"));
} catch (IOException e) {
}

Be sure to substitute strawberry.jpg for the actual file.

If the code is running in an applet, then its just as easy to obtain the image from the applet codebase:

try {
URL url = new URL(getCodeBase(), "strawberry.jpg");
img = ImageIO.read(url);
} catch (IOException e) {
}

Image I/O which has support for GIF, PNG, JPEG, BMP, and WBMP, recognises the contents of the file as a JPEG format image, and decodes it into a BufferedImage which can be directly used by Java 2D.

Hope this helps. :)

[Norm]

How are you executing the program?
Do you get any error messages?

[Shikatsu]

How are you executing the program?
Do you get any error messages?

The program executes fine and no error messages, the problem is the image doesn't show up in the applet only a 50*50 black square, that makes me wonder if the image is actually copied to BufferedImage (BuffImg).

[Norm]

Read the API doc for the getImage method. It probably doesn't do what you want when you want it.

[Shikatsu]

Read the API doc for the getImage method. It probably doesn't do what you want when you want it.

This is what the API doc say:

getImage

public Image getImage(URL url,
String name)

Returns an Image object that can then be painted on the screen. The url argument must specify an absolute URL. The name argument is a specifier that is relative to the url argument.

This method always returns immediately, whether or not the image exists. When this applet attempts to draw the image on the screen, the data will be loaded. The graphics primitives that draw the image will incrementally paint on the screen.

Parameters:
url - an absolute URL giving the base location of the image.
name - the location of the image, relative to the url argument.
Returns:
the image at the specified URL.

And about getDocumentBase():

public URL getDocumentBase()

Gets the URL of the document in which this applet is embedded. For example, suppose an applet is contained within the document:

Archive: J2SE End of Life (EOL) Versions


The document base is:

Archive: J2SE End of Life (EOL) Versions


Returns:
the URL of the document that contains this applet.

From reading the doc I can't see there is a problem with getImage() or getDocumentBase().

I have already tried what SourCookie suggested, but it's the same.

[Norm]

When this applet attempts to draw the image on the screen, the data will be loaded.

That says to me that the image data might not be loaded UNTIL you attempt to draw the image on the screen.
Your code does NOT attempt to draw the image on the screen so it might not be loaded.

Try adding this to your paint method:
G.drawImage(IMG, 250, 250, this); // This causes the image to be loaded

and if that works, add this following the above (all in paint):

Graphics2D Graph = BuffImg.createGraphics();
Graph.drawImage(IMG, 0, 0, this);
G.drawImage(BuffImg, 100, 100, this);

I got the image to draw on the screen with both of the above.

[Shikatsu]

Thank you Sir Norm, You are awesome

Here is the code in case someone curious:

import java.applet.*;
import java.awt.*;
import java.awt.image.*;
 
public class ImageExampleWithBuffer extends Applet
{
    private int WinWidth  = 200;
    private int WinHeight = 200;
     
    Image IMG;
     
    BufferedImage BuffImg = new BufferedImage(50, 50,
                                              BufferedImage.TYPE_INT_RGB);
    Graphics2D Graph = BuffImg.createGraphics(); 
    @Override
    public void init()
    {
        setSize(WinWidth, WinHeight);
         
        IMG = getImage(getDocumentBase(), "WhiteSmily.jpg");
          
        repaint();
    }
     
    @Override
    public void paint(Graphics G)
    {
        Graph.drawImage(IMG, 0, 0, this);
        G.drawImage(BuffImg, 50, 50, this);
    }
             
}

Any comment, suggestion I will be glad to heart it.

[DarrylBurke]

Cross posted
Need Help Loading couple images to a BufferedImage. (Applets forum at JavaRanch)

db

[Norm]

DB Nice post on the ranch

[Shikatsu]

It's a against the rules to post the same question on a different forum or something?

[Fubarable]

It's a against the rules to post the same question on a different forum or something?

Did you read the link that Darryl gave you on the ranch regarding this? Please read the information given to you before making us restate that which has been stated before.

[Shikatsu]

I have read that on coderanch, I asked here before I noticed that post, and I was wondering if it's the same here.
imho, I won't be annoyed if someone came and asked me a question then he/she went to someone else to get a second opinion, it's like getting a second opinion from another doctor, should that be annoying? I am just wondering.

Even though, I posted there because no one answered for a while and I don't have much free time and when I do I need to achieve the most I can in that time.

Thank you for you understanding.

[Fubarable]

I have read that on coderanch, I asked here before I noticed that post, and I was wondering if it's the same here.

The principles of etiquette are the same everywhere.

imho, I won't be annoyed if someone came and asked me a question then he/she went to someone else to get a second opinion, it's like getting a second opinion from another doctor, should that be annoying? I am just wondering.

Again read the link. We're not annoyed by multiposting. We're annoyed by your not being forthcoming about it.

Even though, I posted there because no one answered for a while and I don't have much free time and when I do I need to achieve the most I can in that time.

And by multiposting without notification, you show that you're not respectful of our time. As the link states, cross-posting can frustrate anyone who tries to help you only to find out later that the same answer was given hours ago in a cross-posted thread. No one likes wasting their time, especially a volunteer. The polite thing to do would be to not do this, but if you feel that you absolutely must, to at least provide links in both cross-posts to each other.

Thank you for you understanding.

Ditto.