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10 lines
383 B
10 lines
383 B
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The overlay example
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This example program shows how to use OpenGL overlays with the Qt OpenGL
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Extension. It contains a QGLWidget with a relatively expensive
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redrawing operation, and rubber-band drawing in the overlay plane.
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Using the overlay has the advantage that the rubber-band may be drawn
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and erased without damaging the image in the main plane, so costly
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redraws are avoided.
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