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Re: 24 bit colors in IDL [message #13654 is a reply to message #13280]

Fri, 20 November 1998 00:00

Vapuser
Messages: 63
Registered: November 1998

Member

davidf@dfanning.com (David Fanning) writes:

(whd snips quote from IDL help file, but leaves in...)
>> (whd)
>> I suspect that the same mechanism is used by
>> 'device,get_visual_name=name' as is used in help,/device. In order to
>> answer the question, a connection is made to the X-server, the die is
>> cast, the matter is settled.
>>
>> If a connection to the X-server has not been made, I would rather see
>> a "don't know" message returned,rather than have IDL decide on the
>> visual. At least that way, when some routine started up, I'd know that
>> I still have the option of pseudo color or true color available. This
>> way, just asking the question decides the answer.
>
> Oh, this is s-o-o-o-o ugly. And news to me too.
> This whole business about never being able to set
> your visual class after opening a window is extremely
> inconvenient.
>

On Unix machines, I suspect this is a limitation of X. Don't know
about Window's machines.

> I would say that if you have no graphics windows
> currently open you ought to be able to change your
> visual class. After all, PV-Wave can do it. :-) :-)
>

Can PV-Wave change the visual class? Also, is it the same in the
Windows version? Does calling device,get_visual_name=name set the
visual class?

> Cheers,
>
> David
>

Yes, cheers. I've just started working in 24bit color, and alot of
my code is implicitly 8-bit. It would be nice to be able to determine
whether the visual class has been set yet, without actually setting
it. Unless I've missed something, it doesn't look like that is
possible.

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[Message index]

		24 bit colors in IDL By: Richard Penrose on Tue, 03 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf7203 on Fri, 06 November 1998 00:00
		Re: 24 bit colors in IDL By: philip aldis on Fri, 06 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Thu, 12 November 1998 00:00
		Re: 24 bit colors in IDL By: Richard Penrose on Wed, 11 November 1998 00:00
		Re: 24 bit colors in IDL By: Andy Bristow on Tue, 17 November 1998 00:00
		Re: 24 bit colors in IDL By: Nigel Wade on Thu, 19 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: Nigel Wade on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: Andy Bristow on Wed, 18 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Tue, 17 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Fri, 20 November 1998 00:00
		Re: 24 bit colors in IDL By: Vapuser on Fri, 20 November 1998 00:00
		Re: 24 bit colors in IDL By: davidf on Thu, 19 November 1998 00:00
		Re: 24 bit colors in IDL By: Vapuser on Thu, 19 November 1998 00:00

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