JOGL 3D Triangle

In this section, we will learn how to create a three-dimensional triangle with the help of simple example. We will also rotate this triangle to see all its sides.

J3DTriangle.java

package com.javatpoint.jogl;

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

import javax.swing.JFrame;

import com.jogamp.opengl.util.FPSAnimator;

public class J3DTriangle implements GLEventListener {

private GLU glu = new GLU();
private float rotation = 0.0f;

   @Override
public void display(GLAutoDrawable drawable) {
final GL2 gl = drawable.getGL().getGL2();


gl.glClear( GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT );
gl.glLoadIdentity(); 
      // Move triangle
gl.glTranslatef( -0.5f, 0.0f, -6.0f ); 
gl.glRotatef( rotation, 0.0f, 1.0f, 0.0f );
gl.glBegin( GL2.GL_TRIANGLES ); 


      // Front
gl.glColor3f( 1.0f, 1.0f, 0.0f ); // Yellow
gl.glVertex3f( 1.5f, 2f, 0.0f ); // Top Of Triangle 
		
gl.glColor3f( 0.0f, 1.5f, 0.0f ); // Green
gl.glVertex3f( -1.5f, -1.5f, 1.5f ); // Left Of Triangle 
		
gl.glColor3f( 1.0f, 0.0f, 1.0f ); // Purple
gl.glVertex3f( 1.5f, -1.5f, 1.5f ); // Right Of Triangle 

      // Right
gl.glColor3f( 1.0f, 1.0f, 0.0f ); // Yellow
gl.glVertex3f( 1.5f, 2.0f, 0.0f ); // Top Of Triangle 
		
gl.glColor3f( 1.0f, 0.0f, 1.0f ); // Purple
gl.glVertex3f( 1.5f, -1.5f, 1.5f ); // Left Of Triangle 
		
gl.glColor3f( 0.0f, 1.0f, 0.0f ); // Green
gl.glVertex3f( 1.5f, -1.5f, -1.5f ); // Right Of Triangle 

      // Back
gl.glColor3f( 1.0f, 1.0f, 0.0f ); // Yellow
gl.glVertex3f( 1.5f, 2.0f, 0.0f ); // Top Of Triangle 
		
gl.glColor3f( 0.0f, 1.0f, 0.0f ); // Green
gl.glVertex3f( 1.5f, -1.5f, -1.5f ); // Left Of Triangle 
		
gl.glColor3f( 1.0f, 0.0f, 1.0f ); // Purple
gl.glVertex3f( -1.5f, -1.5f, -1.5f ); // Right Of Triangle 

      //left
gl.glColor3f( 1.0f, 1.0f, 0.0f ); // Yellow
gl.glVertex3f( 1.5f, 2.0f, 0.0f ); // Top Of Triangle 
		
gl.glColor3f( 1.0f, 0.0f, 1.0f ); // Purple
gl.glVertex3f( -1.5f, -1.5f, -1.5f ); // Left Of Triangle 
		
gl.glColor3f( 0.0f, 1.0f, 0.0f ); // Green
gl.glVertex3f( -1.5f, -1.5f, 1.5f ); // Right Of Triangle 
		
gl.glEnd(); 
gl.glFlush();
rotation += 0.6f;
   }

   @Override
public void dispose( GLAutoDrawable drawable ) {
      //method body
   }

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

   @Override
public void reshape( GLAutoDrawable drawable, int x, int y, int width, int height ) {

final GL2 gl = drawable.getGL().getGL2();
if(height<=0)
height = 1;
			
final float h = ( float ) width / ( float ) height;
gl.glViewport( 0, 0, width, height );
gl.glMatrixMode( GL2.GL_PROJECTION );
gl.glLoadIdentity();
		
glu.gluPerspective( 45.0f, h, 1.0, 20.0 );
gl.glMatrixMode( GL2.GL_MODELVIEW );
gl.glLoadIdentity();
   }

public static void main( String[] args ) {

final GLProfile gp = GLProfile.get( GLProfile.GL2 );
GLCapabilities cap = new GLCapabilities(gp );

final GLCanvas gc = new GLCanvas( cap );
      J3DTriangle triangle = new J3DTriangle();
		
gc.addGLEventListener( triangle );
gc.setSize( 400, 400 );
		
final JFrame frame = new JFrame( "3D Triangle" );
		
frame.add(gc);
frame.setSize(500,400);
frame.setVisible(true);  

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

Output: