I use GLJPanel and I write below code but I have below error But I do not take any error GLcanvas. I think I take error when I call getContext() method. How can I solve this problem
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.media.opengl.GLJPanel.getContext(GLJPanel.java:787)
at FisrtJoglPackage.SceneRenderer.<init>(JOGLDemo5.java:221)
..............
..............
public class JOGLDemo5 extends JFrame implements ChangeListener
{
final static int WIDTH = 100;
final static int HEIGHT = 100;
final static int FPS = 30;
private SceneRenderer sr;
FPSAnimator animator;
public JOGLDemo5 ()
{
super ("JOGLDemo #5");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GLCapabilities caps=new GLCapabilities();
caps.setAlphaBits(0);
sr = new SceneRenderer (caps);
final Animator animator = new Animator(sr);
sr.setPreferredSize (new Dimension (WIDTH, HEIGHT));
this.add(sr);
initGui();
pack ();
setVisible (true);
animator.start();
}
public static void main (String [] args)
{
Runnable r = new Runnable ()
{
public void run ()
{
new JOGLDemo5 ();
}
};
EventQueue.invokeLater (r);
}
class SceneRenderer extends GLJPanel implements GLEventListener,MouseListener,MouseMotionListener
{
public SceneRenderer ( GLCapabilities caps)
{
super(caps);
GLContext context= this.getContext();
context.getGL();
addGLEventListener (this);
}
public void init (GLAutoDrawable drawable)
{
GL gl = drawable.getGL ();
glc=drawable.getGL();
gl.glEnable (GL.GL_DEPTH_TEST);
gl.glShadeModel(GL.GL_SMOOTH);
gl.glClearColor(0, 0, 0, 0);
}
public void display (GLAutoDrawable drawable)
{
GL gl = drawable.getGL ();
//Draw Something
}
public void reshape (GLAutoDrawable drawable, int x, int y, int width,
int height)
{
}