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Re: Multi Planar Viewer [message #50511]

Wed, 04 October 2006 20:17

Robbie
Messages: 165
Registered: February 2006

Senior Member

> The message sending is very fast. The image re-draw is
> relatively slow

Indeed, it seems that too many calls to IDLgrWindow::draw is the
bottleneck today.

One thing that I've found really handy about OO is that my rendering
classes report the redraw time. For this particular application I have
a redraw time of around 200ms. I guess this makes messaging semantics
somewhat irrelevant.

My speed problem is definately too many redraws. I just implemented a
"redraw flag". A call to ::redaw just flips a flag. My event processing
routine checks for flipped flags at each iteration of the event loop,
which guaruntees that there will be only one redraw per widget_draw per
event.

I consider this solution a bit of a hack, because I should be able to
program visualisations such that ::redraw is only called when it is
absolutely necessary.

I'm still squeamish about messaging between visualisations. I've got 14
visualisations with various interdependancies. A single message could
trigger 2^13 messages if every dependancy was registered. I guess
that's a *good* reason not to use iTools :-)

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[Message index]

		Re: Multi Planar Viewer By: Robbie on Wed, 04 October 2006 20:17
		Re: Multi Planar Viewer By: David Fanning on Wed, 04 October 2006 18:40
		Re: Multi Planar Viewer By: Robbie on Wed, 04 October 2006 18:14
		Re: Multi Planar Viewer By: David Fanning on Wed, 04 October 2006 16:54

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