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  1.  
  2. The overlay example
  3.  
  4. This example program shows how to use OpenGL overlays with Qt OpenGL
  5. Extension. Contains a QGLWidget with a relatively expensive redrawing
  6. operation, and rubber-band drawing in the overlay plane. Using the
  7. overlay has the advantage that the rubber-band may be drawn and erased
  8. without damaging the image in the main plane, so costly redraws are
  9. avoided.
  10.