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Re: Expose Events (easy questions) [message #30028 is a reply to message #30026]

Thu, 04 April 2002 08:38

Ted Cary
Messages: 53
Registered: October 2001

Member

David Fanning wrote:

> If you want my opinion, I'd stay as far away
> from the APP_SCROLL keyword as possible.

The behavior on our Macs here has nothing to do with APP_SCROLL. I replaced
the APP_SCROLL switch with /VIEWPORT_EVENTS, /EXPOSE_EVENTS. No difference.
I've tested the program on 3 different Macs now, even an iMac, and the X field
of the expose event structure always contains the y screen size. Did anyone
else test this on a Macintosh?

I'm still wondering why the documentation says to use this technique "when
displaying images or anything else displayed in device units." It's supposed
to be "good for displaying large images because the entire image does not have
to be redrawn when viewport events are generated."

Is setting RETAIN to 0 and then handling expose and viewport motion events
really the correct what to deal with large images? The documentation makes it
sound like it's the preferred way, but nobody seems to have ever used it. I'll
write something to test if this method is really any better... it's just hard
to believe they'd make such claims in the documentation for no reason.

Thanks to everyone who took the time to test this out,

Ted Cary

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[Message index]

		Re: Expose Events (easy questions) By: David Fanning on Thu, 04 April 2002 09:59
		Re: Expose Events (easy questions) By: Ted Cary on Thu, 04 April 2002 08:38
		Re: Expose Events (easy questions) By: Ted Cary on Wed, 03 April 2002 09:49
		Re: Expose Events (easy questions) By: James Kuyper on Wed, 03 April 2002 10:17
		Re: Expose Events (easy questions) By: David Fanning on Wed, 03 April 2002 09:35
		Re: Expose Events (easy questions) By: David Fanning on Wed, 03 April 2002 09:09

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