> I searched the previous articles in the forum. Now I understant why the text is transformed just like an object. My question still remains. How to draw the text specified in screen coordinates? Thanks for all helps.
>
> With best wishes,
>
> Linda

Linda,

Solution 1:


My_GL_Window::draw()
{
  glViewport(0, 0, w(), h());

  setup_3D_projection();
  setup_3D_view();
  draw_3D_stuff();

  // setup 2D projection
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glOrtho(0, w(), 0, h(), -1, 1);

  // setup 2D view
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();

  draw_2D_Stuff();
}


However, if your draw() currently looks like this:


My_GL_Window::draw()
{
  if(!valid)
  {
    glViewport(0, 0, w(), h());
    setup_3D_projection();
  }

  setup_3D_view();
  draw_3D_stuff();
}


then you will need solution 2:


My_GL_Window::draw()
{
  if(!valid)
  {
    glViewport(0, 0, w(), h());
    setup_3D_projection();
  }

  setup_3D_view();
  draw_3D_stuff();

  // save and setup 2D projection
  glMatrixMode(GL_PROJECTION);
  glPushMatrix();
  glLoadIdentity();
  glOrtho(0, w(), 0, h(), -1, 1);

  // save and setup 2D view
  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();
  glLoadIdentity();

  draw_2D_Stuff();

  // restore 3D state
  glPopMatrix();
  glMatrixMode(GL_PROJECTION);
  glPopMatrix();
}


Don.