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Re: Expose Events (easy questions) [message #30065 is a reply to message #30063]

Wed, 03 April 2002 09:09

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Ted Cary (tedcary@yahoo.com) writes:

> Anyone with experience using scrollable, resizable draw widgets and RETAIN=0
> should be able to answer these easily.

Leaves me out, sorry. :-(

> What is contained in the X and Y fields of the structure generated by a draw
> widget expose event ?

You've got me. The documentation is...well...the documentation. :-(

> The APP_SCROLL draw widget is in a resizable base. The expose events are
> generated when the base is resized

I don't understand how this can happen. Can
you provide more details about this?

> Finally, is this even the fastest way to scroll through a large image?
> That's the motivation behind using APP_SCROLL in the first place. Should I
> be using any other techniques as well, like DEVICE_COPYING from pixmaps or
> anything like that?

I haven't done this in a LONG time, but I used
a Device Copy from a much larger pixmap into
the smaller draw widget, using the values obtained
from the VIEWPORT event structure to tell me where
to start copying in my pixmap. It worked great, as
far as I remember. I haven't been able to find that
program, but I've changed computers several times
since I wrote it.

Do you have a simple example you can provide us to
fool around with?

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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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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