gl.glClear (GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT )

package com.javatpoint.jogl;
import javax.media.opengl.GL2; 
    

import javax.media.opengl.*;
import javax.media.opengl.awt.GLCanvas; 

import javax.swing.JFrame; 

import com.jogamp.opengl.util.FPSAnimator; 

public class JRotation implements GLEventListener { 
public float rotation; 

   @Override 
public void display( GLAutoDrawable drawable ) {

final GL2 gl = drawable.getGL().getGL2(); 
gl.glClear (GL2.GL_COLOR_BUFFER_BIT |  GL2.GL_DEPTH_BUFFER_BIT );  

      // Clear The Screen And The Depth Buffer 
gl.glLoadIdentity();  // Reset The View     

      //triangle rotation      
gl.glRotatef( rotation, 0.0f, 1.0f, 0.0f );  


gl.glBegin(GL2.GL_TRIANGLES);     
      //Green Color
gl.glColor3f( 0.0f,1.0f,0.0f ); 
gl.glVertex2d(0,0.5);
gl.glVertex2d(-0.5,-0.5);
gl.glVertex2d(0.5,-0.5);

gl.glEnd();

gl.glFlush(); 
      //Assign the angle
rotation += 0.6f;  
   } 
    
   @Override 
public void dispose( GLAutoDrawable arg0 ) { 
      //method body 
   } 

   @Override 
public void init( GLAutoDrawable arg0 ) { 
      // method body 
   }

   @Override 
public void reshape( GLAutoDrawable drawable, int x, int y, int width, int height ) { 
   }
public static void main( String[] args ) {
        
final GLProfile gp  = GLProfile.get(GLProfile.GL2 ); 
GLCapabilities cap  = new GLCapabilities(gp);

final GLCanvas gc = new GLCanvas(cap); 
JRotation jr = new JRotation(); 
gc.addGLEventListener(jr); 
gc.setSize( 400, 400 );  

final JFrame frame = new JFrame("JOGL Rotation");

frame.add(gc);
    frame.setSize(500,400);
    frame.setVisible(true); 

final FPSAnimator animator = new FPSAnimator(gc, 400,true); 
animator.start(); 

   } 
    
}