Split BufferedImage into Array

[Coold0wn]

hi guys, i tried to split a buffered image into an Array.. but it fails

   


private BufferedImage imageTileset;
private BufferedImage[] images;

imageTileset = ImageToBufferedImage("http://www.java-forums.org/images/0");
images = splitImage(imageTileset, 16, 16);



 public BufferedImage[] splitImage(BufferedImage img, int cols, int rows)
    {  
            int w = img.getWidth()/cols;  
            int h = img.getHeight()/rows;  
            int num = 0;  
            BufferedImage imgs[] = new BufferedImage[w*h];  
            for(int y = 0; y < rows; y++) 
            {  
                for(int x = 0; x < cols; x++) 
                {  
                    imgs[num] = new BufferedImage(w, h, img.getType());   // => ArrayIndex 4 doesnt work;
                    // Tell the graphics to draw only one block of the image  
                    Graphics2D g = imgs[num].createGraphics();  
                    g.drawImage(img, 0, 0, w, h, w*x, h*y, w*x+w, h*y+h, null);  
                    g.dispose();  
                    num++;  
                }  
            }  
            return imgs;  
    } 



  public BufferedImage ImageToBufferedImage(String imagepath) 
{
    BufferedImage img = toBufferedImage(new ImageIcon(imagepath + ".png").getImage());
    return img;
  }

  public BufferedImage toBufferedImage(Image image) {
    image = new ImageIcon(image).getImage();

    BufferedImage bimage = new BufferedImage(image.getWidth(null), image
        .getHeight(null), BufferedImage.TYPE_INT_ARGB);

    Graphics g = bimage.createGraphics();

    g.drawImage(image, 0, 0, null);
    g.dispose();
    return bimage;
  }

at the line which i wrote the mistake in, it says:
ArrayIndex Bounds out of exception: 4....
i dont know why.. i got the code from the internet and im not that into java , that i can find it :/
help me please

if you need to know: my image is 1024x1024 and a .png...

[DarrylBurke]

i got the code from the internet

Any code that uses

image = new ImageIcon(image).getImage();

is cr@p. I strongly recommend that you avoid the site where you got that code.

im not that into java

You can find all you need here: The Java™ Tutorials

Do you know how to declare and use arrays in Java? There's a section in the tutorial about that. Refer to it if you need to.

BufferedImage has a method getSubImage(...) which could be useful. Moreover, since subImages share the same data array with the image they are split from, a tiling program using these images would be less memory intensive than one which constructs new images for each tile. That could improve performance when tiling a large image.

I recommend you try to do this yourself with reference to the tutorials and the API. Feel free to post a question here any time you get stuck, preferably with a SSCCE, which will help you get better help sooner.

db

[DarrylBurke]

Oh, and use ImageIO to load your image.

db

[Coold0wn]

oh thx for these informations :)
well i took this one, because its like the only website in the internet which manages to give a whole code, and not a summery of methods and attributes..
most sites said: you can also split images.

and thats a big problem to me , cause i just cant invent sth like this :P
well.. im nearly finished with my program already.. but i think ill start over to learn everything exactly and right with the website you gave me..
are you sure that everything is right with this tutorial? cause i do like always get an error if i try to do it like them... :/


edit: arrays are the last problem... theyre pretty easy, but these images in java... stealing my nerves^^
its like some chosen ones understand how they are working , and all the others ... can copy paste..^^

edit2: Wow... i work with BlueJ - i changed nothing, closed the program, reopened the project, started it ... and it worked... Oo

but i have another question, if you would be so kind and answert it:
How can i make Buttons, that only are a picture.. because my buttons are not 64x64 px squares, but they have a border which is about 100x80.. and that looks stupid..
i heard , you can do it with images, and with a mouse listener so it somehow knows at which picture you are at and then does different things if you click...
do you know anything about that?