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Thread: drawing a cube

  1. #1
    Newbie Newbie
    Join Date
    Oct 2013
    Posts
    2

    drawing a cube

    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. #2
    Advanced Member Frequent Contributor
    Join Date
    Apr 2010
    Posts
    746
    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 Forum Posting Guidelines for suggestions what information to include/how to ask questions.

  3. #3
    Newbie Newbie
    Join Date
    Oct 2013
    Posts
    2

    my code is:

    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. #4
    Advanced Member Frequent Contributor
    Join Date
    Apr 2010
    Posts
    746
    Please use [code][/code] 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.

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