draw callback function in vega

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From: Changhee Han (changhee++at++ict.usc.edu)
Date: 06/11/2001 17:44:43


Hello all,
It might be vega-specific question. But by chance I'd like to get some
answer from anyone of you.

In vgAddFunc(... , int which, ....), "which" has VGCHAN_POSTDRAW,
VGCHAN_PREDRAW, etc.
I think there is no VGCHAN_DRAW for "which".

Like chan->setTravFunc(PFTRAV_DRAW, my_callback) in performer, I want to
know draw callback for channel in vega, not post or pre draw callback
function.

What I want to do is to change the buffer to be drawn into Auxillary buffer
in vega.
I think, for doing this, there may be one option to use performer callback
function like in above(chan->setTravFunc).
But if I insist on using vega "DRAW" callback, what can be the vega function
for this?

Thanks in advance,
changhee
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