hello,

for an application i use the graphics unit. I define two pages,
one is
visible through setvisualpage(0), while on the other
(setactivepage(1))
I draw a figure. When the figures are drawn, I switch pages such
that
the figure becomes visible in a flash (you need to do this if you
want
to record e.g. reaction times accurately). But each time the
swapping of
pages happens, some parts of the picture are seen somewhere on the
screen. So it seems that swapping does not work very well. What is
the
problem?
Thanks a lot,
Francis.

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