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  Problems with double buffering  (Read 1522 times)
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Offline PRE

Junior Newbie




Xuaaa


« Posted 2003-04-25 09:06:58 »

Hi all. I am having troubles double buffering my images. I hope that you can help me and tell me what I'm doing worng.

I have my paint method in my Actor class (base class of all showables) like this:

   [source]  
public void paint( Graphics g )
{
     if( img == null )
           throw new RuntimeException("Calling Paint and image not Created!!!");

     if( buffer == null ) {
           buffer = Util.getBuffer(img);
           //buffer = img;
           
     }
     g.drawImage(buffer,tile.x,tile.y,TILE_SIZE,TILE_SIZE,null);
}
 

And that Util.getBuffer is a static method that allows me to have secevral objects sharing the same image(BufferedImage ins this case). I have it like this:

     
public static Image getBuffer( Image img )
{
     if( allBuffers.containsKey(new Integer(img.hashCode())) )
           return (BufferedImage)allBuffers.get(new Integer(img.hashCode()));
           
     BufferedImage backbuffer = new BufferedImage(Actor.TILE_SIZE, Actor.TILE_SIZE, BufferedImage.TYPE_4BYTE_ABGR);
     Graphics backbuffergc = backbuffer.getGraphics();
     backbuffergc.drawImage(img,0,0,Actor.TILE_SIZE,Actor.TILE_SIZE,null);
     
     allBuffers.put(new Integer(img.hashCode()),backbuffer);
     
     return backbuffer;
}
 [/source]

Well, like this, the Window is blank, no image is shown. Why?
I am using 45x45 png's in MDK 9.1!

Tkz for any help.

[]

:: {PRE}'s Programming Depot  ::
.: "There are 10 types of people in this world. Those who know binary and those who don't."
.: HopeInMankind.cpp :3382: Confused by earlier errors, bailing out.
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