title: Why can polygons be displayed but the point cannot
body: <pre><code>public class SimpleJOGL2 implements GLEventListener {
  
      private float x = 0.5f;
      private float y = -0.5f;
      public static void main(String[] args) {
          Frame frame = new Frame("Simple JOGL Application");
          GLCanvas canvas = new GLCanvas();
  
  
          canvas.addGLEventListener(new SimpleJOGL2());
          frame.add(canvas);
          frame.setSize(640, 640);
          final Animator animator = new Animator(canvas);
          frame.addWindowListener(new WindowAdapter() {
  
              @Override
              public void windowClosing(WindowEvent e) {
                  // Run this on another thread than the AWT event queue to
                  // make sure the call to Animator.stop() completes before
                  // exiting
                  new Thread(new Runnable() {
  
                      public void run() {
                          animator.stop();
                          System.exit(0);
                      }
                  }).start();
              }
          });
          // Center frame
          frame.setLocationRelativeTo(null);
          frame.setVisible(true);
          animator.start();
      }
  </code></pre>
  
  <p>And... </p>
  
  <pre><code>public void display(GLAutoDrawable drawable) {
  
    GL gl = drawable.getGL();
  
  
    float a[][] = {{x,y},{x,y-0.05f},{x-0.2f,y-0.15f},{x-0.22f, y-0.17f}};
    float b[][] = {{x,y},{x,y-0.05f},{x+0.2f,y-0.15f},{x+0.22f, y-0.17f}};
    float c[][]= {{x+0.03f,y-0.25f},{x-0.03f,y-0.25f},{x-0.03f,y-0.4f},{x+0.03f,y-0.4f}};
    float col[] ={230/255f,84/255f,109/255f};
    drawPolygon(gl,a,col);
    drawPolygon(gl,b,col);
    drawPolygon(gl,c,col);
  
    gl.glLoadIdentity();
    gl.glColor3f(0,0,0);
    gl.glPointSize(4.0f);
    gl.glBegin(GL.GL_POINT);
        gl.glVertex2f(x+0.015f, y-0.33f);
    gl.glEnd();
    gl.glFlush();
  
  
      }
  </code></pre>
  
  <p>I want to draw polygons and points. polygons can be displayed, but the point cannot. </p>
  
  <pre><code>    public void drawPolygon(GL gl, float a[][], float col[]){
          gl.glColor3f(col[0], col[1], col[2]);
          gl.glBegin(GL.GL_POLYGON);
              gl.glVertex2f(a[0][0], a[0][1]);
              gl.glVertex2f(a[1][0], a[1][1]);
              gl.glVertex2f(a[2][0], a[2][1]);
              gl.glVertex2f(a[3][0], a[3][1]);
  
         gl.glEnd();
      }
  
  }
  </code></pre>