dolachin
Senior Newbie 
Java games rock!
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Posted
2003-11-24 04:50:47 » |
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Hi,
I'm revisiting a topic from three months ago. I've been trying to incorporate the advice I got at this forum at get it to work on my own - and failed!!!
I'm working on a scientific application which shows the evolution of a shape. Every once in a while I want to be able to snap a picture of what's going on. I don't want to overload you, potential helpers, with code so I will just present the code for my takeAPicture procedure (with comments) and may be you will be able to spot something. I am very happy to post more code.
Many thanks in advance for any advice.
public BufferedImage takeAPicture(int inWidth, int inHeight) {
if (myOffScreenBuffer == null) { // class member elem
GLCapabilities pbCaps = new GLCapabilities();
pbCaps.setDoubleBuffered(false);
myOffScreenBuffer = myCanvas3D.createOffscreenDrawable(pbCaps, inWidth, inHeight);
myOffScreenBuffer.addGLEventListener(new OffScreenGLEventListener());
// I have a hard time getting init() to be called in
// OffScreenGLEventListener. I have to resize the live
// window, call takeAPicture again, and only then it
// gets called.
}
BufferedImage pbImage = new BufferedImage(inWidth, inHeight, BufferedImage.TYPE_3BYTE_BGR);
DataBufferByte dbByte = (DataBufferByte) pbImage.getRaster().getDataBuffer();
myOffScreenBuffer.display();
myOffScreenBuffer.getGL().glReadPixels(0, 0, inWidth, inHeight, GL.GL_BGR, GL.GL_UNSIGNED_BYTE, dbByte.getData());
return pbImage; // returns nothing but black pixels
}
Would you like to see my OffScreenGLEventListener?
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