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| Re: Why is IDLgrSrcDest::Draw so slow when calling IDLgrPolygon::SetProperty? [message #35088 is a reply to message #35085] |
Wed, 14 May 2003 08:09  |
Karl Schultz
Messages: 341
Registered: October 1999
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Senior Member |
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"Rick Towler" <rtowler@u.washington.edu> wrote in message
news:b9ru45$20qi$1@nntp6.u.washington.edu...
> I am puzzled over why IDLgrSrcDest::Draw is so slow when I call
> IDLgrPolygon::SetProperty. Depending on the polygon count I am seeing up
to
> a 60% drop in frame rates when I change the color of a IDLgrPolygon object
> vs. when I don't. This is a real bummer as I am animating 500-1000
> IDLgrPolygon objects which present information thru their changing color.
>
> Looking at the output of PROFILER it seems that IDL is spending this extra
> time in IDLgrSrcDest::Draw. Knowing that IDL will cache properties of
> graphic atoms to speed subsequent draws, I am guessing that these
properties
> are updated in IDLgrSrcDest::Draw? Venturing further out on the limb, I
am
> guessing that a call to IDLgrPolygon::SetProperty sets a flag that forces
> the atom's cache to be updated when IDLgrSrcDest::Draw is called. If this
> is the case, I would think that properties such as COLOR, and LINESTYLE
> wouldn't require IDL to re-calculate these properties and I am wondering
why
> I have to pay this price.
>
> Am I interpreting this correctly or am I crazy?
Yes and No.
You are absolutely right. The best I can do is fix this in the next
release.
Karl
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