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Re: call to X device opens window [message #50975 is a reply to message #50742]

Wed, 25 October 2006 17:02

Sven Geier
Messages: 17
Registered: July 2002

Junior Member

Bringfried Stecklum wrote:

> Just a quick question related to the X device. I am just wondering why
> device,set_font='AnyFontYouLike' opens a window if none are open while,
> e.g. device,deco=0 does not do it?
>

1) The correct answer: Who knows why something in IDL works the way it
works...

2) The "best guess": device,/deco doesn't really do anything to the device -
it merely tells IDL how to treat that device (i.e. how to handle color). It
can be executed whether the device actually exists or not, as long as
you're not actually plotting anything. While set_font needs to make sure
whatever font you selected actually exists which means it needs to actually
talk to the X-server (of Xfs, really, I suppose): Because the X-server
could have different fonts available for different screens (different
resolutions etc) there needs to be an actual drawable with an
actually-existing resolution, color-depth etc before you can talk
about "fonts".

This guess is informed more by my knowledge of X than IDL, though, so
there's no guarantees...

-S

--
http://www.sgeier.net
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[Message index]

		call to X device opens window By: Bringfried Stecklum on Thu, 19 October 2006 03:49
		Re: call to X device opens window By: David Fanning on Wed, 25 October 2006 17:23
		Re: call to X device opens window By: David Fanning on Wed, 25 October 2006 17:20
		Re: call to X device opens window By: Sven Geier on Wed, 25 October 2006 17:02

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