drawing a cube

OpenGL OpenGL: Basic Coding
1

I am a begginer and I am trying to draw a cube with opengl in java,for that I tried to modify your source posted in tutorials for begginers, that “hello
demo” but does nothing. I want to draw the cube using glutWireCube. Could anyone show me an example for that?

2

Not sure which tutorial you are referring to, AFAIK opengl.org does not host tutorials directly, but there is a list of them on the wiki. I would recommend picking one of those targeting OpenGL 3.0.
Please note that your problem description is not very helpful, so it’s not really possible to help, take a look at the [thread=176139]Forum Posting Guidelines[/thread] for suggestions what information to include/how to ask questions.

3

package glredbook10;

import java.awt.BorderLayout;
import java.awt.Frame;

import javax.media.opengl.GL;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLEventListener;

import com.sun.opengl.util.Animator;
import com.sun.opengl.util.GLUT;

public class robot extends Frame implements GLEventListener{

public robot() {
    super("Basic JOGL Demo");

    setLayout(new BorderLayout());
   // addWindowListener(this);

    setSize(600, 600);
    setLocation(40, 40);

    setVisible(true);

    setupJOGL();
}

public void init(GLAutoDrawable drawable) {
GL gl = drawable.getGL();

gl.glClearColor(0, 0, 0, 0);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glOrtho(0, 1, 0, 1, -1, 1);
}

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

public void displayChanged(GLAutoDrawable drawable,
                           boolean modeChanged,
                           boolean deviceChanged) {
}

public void display(GLAutoDrawable drawable) {

GL gl = drawable.getGL();
GLUT glut=new GLUT();
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glColor3f(1, 0, 0);
glut.glutWireCube(14.0f);
gl.glFlush();
}

private void setupJOGL(){
GLCapabilities caps = new GLCapabilities();
caps.setDoubleBuffered(true);
caps.setHardwareAccelerated(true);
GLCanvas canvas = new GLCanvas(caps);
canvas.addGLEventListener(this);

add(canvas, BorderLayout.CENTER);

Animator anim = new Animator(canvas);
anim.start();

}

public static void main(String[] args) {
    robot demo = new robot();
    demo.setVisible(true);
}

}
But it does display nothing , why?

4

Please use [noparse]

[/noparse] around source snippets.
Is this code unmodified from the tutorial? There are some oddities in it, for example the orthographic projection matrix should normally be put on the GL_PROJECTION matrix stack. Also, your orthographic projection only projects objects in the [0,0,-1] x [1,1,1] world coordinate cube onto the screen, but your wire cube is entirely outside this volume.