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  Drawing directly onto the BufferStrategy  (Read 1028 times)
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Offline StonePickaxes

JGO Coder


Medals: 4
Projects: 2


Nathan Kramber


« Posted 2012-07-23 07:10:49 »

In previous project, I have done my Java2D rendering by drawing onto a BufferedImage and drawing that to a BufferStrategy. This allowed me to scale the image to acheive a low-resultion effect at higher resolution windows by drawing the image as

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g.drawImage(image, 0, 0, width, height, null);


but when I make the window, I go

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main.setPreferredSize(new Dimension(width * scale, height * scale));


Thus making it three times more spread out.

Anyways I just found out how much more efficient it is to draw directly onto the BufferStrategy instead of using a BufferedImage. So my question is:

How can I draw directly onto the BufferStrategy and still scale the image? Is this possible at all?

Thanks,
 | Nathan

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Offline jonjava
« Reply #1 - Posted 2012-07-23 08:42:29 »

Wouldn't drawing directly on the BufferStrategy nullify its use? Isn't its purpose to do the double buffering for you so you don't have to keep track of the off-screen fully drawn image?

I've worded that badly, this is what I use

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                // Create BufferStrategy
     BufferStrategy bs = getBufferStrategy();
      if (bs == null) {
         createBufferStrategy(3);
         return;
      }

                // Get BufferStategy's graphics object //
     Graphics g = bs.getDrawGraphics();
                // Clear the screen
     g.fillRect(0, 0, getWidth(), getHeight());

      int ww = WIDTH * SCALE;
      int hh = HEIGHT * SCALE;

                // draw on it
     g.drawImage(image, 0, 0, ww, hh, null);
               
                // dispose of it (finished drawing)
     g.dispose();
                // show it
     bs.show();

Offline CaptainJester

JGO Knight


Medals: 12
Projects: 2
Exp: 14 years


Make it work; make it better.


« Reply #2 - Posted 2012-07-24 00:47:50 »

When you are drawing you can cast your Graphics object to a Graphics2D object. Then call Graphics2D.scale(). Then do your drawing after calling scale. All future drawing calls will be scaled.

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Offline nsigma
« Reply #3 - Posted 2012-07-24 01:03:09 »

Depending on exactly what drawing operations you are doing, it may be faster to draw at 'normal' scale into a VolatileImage, and draw that scaled to the BufferStrategy.

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