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  rotation creates garbage?  (Read 1108 times)
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Offline Fiola

Junior Newbie




Java games rock!


« Posted 2004-01-08 06:41:17 »

Hello everyone, i am makinga top down view shooter game and i currently have the character facing where ever the mouse it. I am doing so using the graphics2d rotation method. It works fine and all, but i noticed that around the edge of the image there are white pixels scattered. Is this normal? Is there any way to get rid of it?
Thanks a lot in advanced!
Offline Herkules

Senior Member




Friendly fire isn't friendly!


« Reply #1 - Posted 2004-01-08 06:56:12 »

Do you use a certain library to do that?

Sounds like the 'dirty rectangle' is too small during rotation. Is there a call to repaint(rect) in play somehwere?


HARDCODE    --     DRTS/FlyingGuns/JPilot/JXInput  --    skype me: joerg.plewe
Offline Fiola

Junior Newbie




Java games rock!


« Reply #2 - Posted 2004-01-08 18:24:21 »

well, here's my code

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public void paint(Graphics g) 
{
     //draw the background
    g.drawImage(background,0,0,this);
      
     Graphics2D g2d = (Graphics2D)g;
     AffineTransform origXform = g2d.getTransform();
     AffineTransform newXform = (AffineTransform)(origXform.clone());

     //Center of rotation is the center of player
    newXform.rotate(GetAngle(), playerX, playerY);
     g2d.setTransform(newXform);
    
     //draw image of player
    int x = (playerX - Lil_Man.getWidth(this)/2);
     int y = playerY - Lil_Man.getWidth(this)/2;

     g2d.drawImage(Lil_Man, x, y, this);
     g2d.setTransform(origXform);

}


thanks a lot for any help!

[edit]: the getAngle() method returns a double of how much angle is needed to rotate to face the mouse
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Offline Jeff

JGO Coder




Got any cats?


« Reply #3 - Posted 2004-01-08 21:33:24 »

My guess (and its only that, a guess) is that you are using color-key transparency and when you rotate anti-aliasing shifts the color of the edge pixels enough to show up.

If so one solution would be to make your bounding box larger then necessary and leave the edges out when you BLT.

Got a question about Java and game programming?  Just new to the Java Game Development Community?  Try my FAQ.  Its likely you'll learn something!

http://wiki.java.net/bin/view/Games/JeffFAQ
Offline Fiola

Junior Newbie




Java games rock!


« Reply #4 - Posted 2004-01-09 00:51:41 »

well, after reading your post i decided to try to use a different format for the image. I switched from using gif, to using png, and now it doesn't have the white pixels around the edge anymore! Cheesy Thanks a lot!

Now i have another quesetion. When i rotate the image, the image gets aliased, is there a method or something that i can call to get it anti aliased?
Thanks a lot in advanced!
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