| Re: Object Graphic Slows on resize [message #32879] |
Fri, 15 November 2002 16:09  |
Rick Towler
Messages: 821
Registered: August 1998
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Senior Member |
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"Mark Servetus" <markservetus@hotmail.com> wrote
> I have a single IDLgrView with several IDLgrImage objects (including
> transparancies). I drag them around and do other mouse events with
> objects just fine, with good performance.
>
> However, once I resize the window and it re-draws, everything slows
> terribly.
In general when you enlarge the window you will see a performance decrease.
The impact will depend on if your graphics card is fill rate limited or
vertex limited. If it is vertex limited you'll see less change in redraw
speed as you enlarge your window. If your card is not vertex limited then
you will see a larger drop in performance as that window grows. Consumer 3d
to high end "Gamer's" cards tend to get vertex limited rather quickly.
Professional 3d cards tend to focus on vertex processing and generally are
fill rate limited.
Your case doesn't make sense. Redraw should speed up when you shrink your
window. I think you should start looking closely at your code and trace
what happens when you resize. I think there is a bug somewhere.
> It seems to me that the cache is created with their original sizes,
> and upon resize, all subsequent draws have to do major interpolation
> from the cache. The only guess that has made sense to me yet. (It
> happens even when I shrink the window.)
No. IDL does cache certain internal properties of graphics atoms but these
wouldn't change when you resize your window (unless you were changing
certain atom properties when you resized the window. Even in this case you
would only see an initial hiccup as the atoms internal properties were
updated then redraw would recover).
It doesn't hurt to make sure you have recent drivers installed. Detonator
40.72 drivers were release on the 11th. But I doubt this is a driver issue.
-Rick
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| Re: Object Graphic Slows on resize [message #32881 is a reply to message #32879] |
Fri, 15 November 2002 15:52  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Mark Servetus (markservetus@hotmail.com) writes:
> I have a single IDLgrView with several IDLgrImage objects (including
> transparancies). I drag them around and do other mouse events with
> objects just fine, with good performance.
>
> However, once I resize the window and it re-draws, everything slows
> terribly.
>
> It seems to me that the cache is created with their original sizes,
> and upon resize, all subsequent draws have to do major interpolation
> from the cache. The only guess that has made sense to me yet. (It
> happens even when I shrink the window.)
I'm going to guess you are doing something that a couple
of weeks from now, when you know better, you would just
as soon nobody knew about. There is really no reason for
the drawing output to slow down noticeably that I can
think of. Well, objects are *always* slower than direct
graphics, but never obnoxiously slow, unless you have done
something wrong (easy to do).
I'd have a good long look at that code. With object graphics
there are always a handful of ways to implement your graphics
tree. I'd try another way and see if your results are similar.
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Object Graphic Slows on resize [message #32964 is a reply to message #32879] |
Mon, 18 November 2002 08:16 |
markservetus
Messages: 7
Registered: November 2002
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Junior Member |
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I stopped /INTERPOLATEing the IDLgrImages and it worked wonders.
Redrawing the view was burdonsome once the resize occured, even when
the view was changing very little.
I may just do the interpolation to the image data (knowing it will be
enlarged) prior to assigning it to the IDLgrImage.
Thanks.
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