I have an applet running in a browser.
Sometimes when I try to close the browser ( Firefox & IE ) they freeze.
The last line I see in the jvm output is "basic: Stopping applet..."


What methods of my applet is the jvm trying to call when it is stopping the applet?

Currently I have something working very much like the second option you mentioned.
I'll guess I'll just stay with that for now.

Thanks.

I have an applet which uses a few external jars after loading.

The first time I load the applet everything works fine. But if I try to load the applet again it breaks because I can't fully read the jar files.  I only manage to make only one IOStream  read call and then the next read() returns -1.

Closing and opening the browser doesn't help.
I can only load the applet again if I replace the jar file on the server with a new copy.

The code I'm using for loading the files:



This is what I get when the applet works

network: Cache entry found [url: http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar, version: null]
network: Connecting http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar with proxy=DIRECT
network: ResponseCode for http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar : 200
network: Encoding for http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar : null
network: Disconnect connection to http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar
network: Connecting http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar with proxy=DIRECT
file length is 348751 bytes
IoStream available = 8476
offset = 8476
offset = 74176
offset = 139876
offset = 205576
offset = 271276
offset = 336976
offset = 348751
Total array length is 348751
Last amount read = 11775
Total read 348751
network: Downloading resource: http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar
   Content-Length: 348,751
   Content-Encoding: null
network: Wrote URL http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar to File C:\Documents and Settings\Dan\Application Data\Sun\Java\Deployment\cache\6.0\49\5da74fb1-5bcb2cd8-temp


....and this is what I get with subsequent loads when the applet crashes;

network: Cache entry found [url: http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar, version: null]
network: Connecting http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar with proxy=DIRECT
network: ResponseCode for http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar : 304
network: Encoding for http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar : null
network: Disconnect connection to http://www.smerc.com/decades_latest/ExternalResources/InitialLoadingResources.jar
file length is 348751 bytes
IoStream available = 346674
offset = 346674
Total array length is 348751
Last amount read = -1
Total read 346674



Am I not closing the jar correctly? What's stopping me from fully reading the file again?

Thanks.

I use containers/components for painting as well. I just call repaint()  whenever they are modified.
I thought that would take care of clipping the drawing regions. I think it doesn't actually matter because I end up ignoring all the paint() calls other than the one in the main loop which calls the paints the top container. This probably results in painting everything again.
If I go with passive rendering I end up getting some flicker in some containers. I presume thats because the paint() thread can't access all the components all the time.

I'm not sure I understand how keldon85 improved performance. Is it just by initializing the image through the initializeGraphics ( int[] buffer ) call? Does this result in the image being rendered faster every paint() call? Currently I just read pngs to a Java.Image and then paint the image to a BufferedImage to get it accelerated.


Image loadedImage= Toolkit.getDefaultToolkit().createImage(byte[]);

BufferedImage  bufImage=
            GraphicsConfiguration.createCompatibleImage(loadedImage.getWidth(null),
                                                    loadedImage.getHeight(null),
                                                    Transparency.TRANSLUCENT);

bufImage.getGraphics().drawImage(im, 0, 0, null);

Thanks for the quick replies.
I'll try profiling the paint method and also try using the BufferStrategy.

Orangy Tang, how much performance increase should I expect from converting  to LWGL?

Kova, are you using Awt Containers/components in your game? Are you repainting the whole 1024*768 every update?

Thanks.

My game is running too slow.
When I run a profiler I see that graphics2d.paint() takes most of the cpu time. The size of the game panel is 1024*768.
I am double buffering and using BufferedImages created via GraphicsConfiguration.createCompatibleImage().

The game has several screens which include buttons and animations.
I am using Awt.Containers/Components for the different screens/game elements because its easier then to manage them on screen and also receive mouse clicks on the buttons.

In order to have to program paint only after I update the game I don't forward the update() call in the double buffered screen to the paint() call but rather call the paint() method myself ( with getGraphics() )after each game update in the main run() loop. ( Active Rendering )

It seems to me like I'm painting a lot. Each screen has an 1024*786 background which I'm painting every iteration in the run() method. I have to paint at least some of that image again and again because I have animations playing in front of it.

I don't want to use LWGL because I want the program to be multi platform. How much faster will the program run if I do switch to lwgl ?

Will abandoning AWT containers/components increase the game speed? If so is there any library for handling painting in a way that minimizes the number of paint calls/ minimizes the areas repainted?

Any suggestions?
Thanks.

I have a set of pngs I'd like to use as a font in my application.
Any implementation suggestions?

Is there any way of doing this to an entire graphics context instead of a specific image?
I'm looking for something like a customized Composite.

I have this snippet:

public class TintingComposite implements Composite
{

  int m_r;
  int m_g;
  int m_b;

  double m_newColorPercentage; // 0-1
  double m_oldPercentage;//0-1

  public TintingComposite(Color a_color, double a_dPercentage)
  {
    m_newColorPercentage = a_dPercentage;
    m_oldPercentage = 1 - m_newColorPercentage;

    m_r = (int) (a_color.getRed() * m_newColorPercentage);
    m_g = (int) (a_color.getGreen() * m_newColorPercentage);
    m_b = (int) (a_color.getBlue() * m_newColorPercentage);

  }

  public CompositeContext createContext(ColorModel srcColorModel,
                                        ColorModel dstColorModel,
                                        RenderingHints hints)
  {
   
    return new CompositeContext()
    {
   
      public void compose(Raster src, Raster dstIn, WritableRaster dstOut)
      {
        for (int x = 0; x < dstOut.getWidth(); x++)
        {
          for (int y = 0; y < dstOut.getHeight(); y++)
          {
            // Get the source pixels
            int[] srcPixels = new int[4];
            src.getPixel(x, y, srcPixels);
           
            //blend in the new r,g,b but keep the alpha
            srcPixels[0] = (int) (srcPixels[0] *
                                  m_oldPercentage + m_r) & 0xff;
            srcPixels[1] = (int) (srcPixels[1] *
                                  m_oldPercentage + m_g) & 0xff;
            srcPixels[2] = (int) (srcPixels[2] *
                                  m_oldPercentage + m_b) & 0xff;
            dstOut.setPixel(x, y, srcPixels);
          }
        }
      }

      public void dispose()
      {
      }
    };

  }
}

The only problem is that I whenever I try to set a pixel which has an alpha different from 1, I end up making it opaque.
I suspect my problem is that when I call dstOut.getNumBands() it returns 3 while src.getNumBands() returns 4.

Any idea? Alternatives?
Thanks.

I have a set of images which I want to tint with different colors.
I know I can make the whole image gray with this code:

BufferedImage   source  = .....;

BufferedImageOp op = new ColorConvertOp(  ColorSpace.getInstance(ColorSpace.CS_GRAY), null);

op.filter(source, source);

This will result in the image being tinted with different shades of gray.

Is there any way to do this with another color other than gray?

Thanks.