Question

j2me Graphics.drawImage()

Asked by: DJ_AM_Juicebox

Hi,

I have a png wrapped in an Image object. I can draw it to screen like:

    public void draw(Graphics g)
    {
        g.drawImage(img, 0, 0, Graphics.TOP | Graphics.LEFT);
    }

Now the image is 128 x 160 pixels.

Is there a way I can get drawImage() to only draw128 x 128 pixels? I was hoping there'd be an overloaded method in drawImage() like:

    drawImage(Image, x, y, widthToDraw, heightToDraw);

but no luck.

Is there some other way to crop the image? I'm thinking I can do something like:

    img.getRGB(rgbData, offset, scanlength, x, y, width, height);
    g.drawRGB(rgbData, offset, scanLength, x, y, width, height, processAlpha);

So I'd extract only 128 pixels vertically into a temporary rgb buffer, then use that with g.drawRGB() ?

Thanks

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Asked On
2008-06-05 at 07:18:54ID23460270
Topics

Java 2 Micro-Edition (J2ME)

,

Java Programming Language

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: rrz@871311Posted on 2008-06-05 at 10:14:06ID: 21721777

I don't have time to test my idea right now. But I think you should look at  
http://developer.sonyericsson.com/site/global/techsupport/tipstrickscode/java/p_java_0502.jsp  
So, yes  use  img.getRGB .  That will get you a int[]  .
But you want to use  Image method
createImage(byte[] imageData, int imageOffset, int imageLength)  
which requires a byte[]  
So use code in link to convert.  

 

by: DJ_AM_JuiceboxPosted on 2008-06-05 at 11:58:33ID: 21722796

I found I could do it by creating an image twice, something like:

Image img = Image.create(from raw bits);

Image imgCropped = Image.create(img, x, y, width, height)

I just make the height whatever I want there and it crops it correctly, as if by magic, amazing!

Thanks

 

by: rrz@871311Posted on 2008-06-05 at 15:26:44ID: 21724623

That is a lot easier than using what I suggested.  
>Image imgCropped = Image.create(img, x, y, width, height)  
I don't see a method like that. You must be referring to  
  createImage(Image image, int x, int y, int width, int height, Sprite.TRANS_NONE)
You should have kept your points, since you found your own solution.

20120131-EE-VQP-002

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