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Re: scripted object graphics question [message #75331 is a reply to message #75323]

Fri, 25 February 2011 06:17

George Millward
Messages: 29
Registered: February 2000

Junior Member

On Feb 25, 6:43 am, David Fanning <n...@idlcoyote.com> wrote:
> George Millward writes:
>> I am trying to convert a bunch of old direct graphics programs to
>> objects.
>> These programs are all called by a cronjob/script so work in the
>> background (no interactivity or windows produced).
>
>> In essence they use this:
>
>> set_plot,'z'
>> write_png .....
>
>> I now realize that I've never seen an example of object graphics
>> working in a similar way - all object
>> examples seem to be embedded in widgets and the like - based on human
>> interactivity.
>
>> I assume I can do this in object graphics ? Does anyone have a simple
>> example of how this is done ?
>
> The object graphics system, of course, *is* the Z-graphics
> buffer. So, I presume the equivalent of a "hidden" window
> would be the IDLgrClipboard.
>
> I've never tried to run an object graphics program
> (well, *any* program, truthfully!) in a cron job,
> so I don't know about that. OpenGL seems inherently
> tied to the graphics device, so I would guess you
> would also need to have software rendering turned on
> for the object graphics system.
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.idlcoyote.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

The cron part isn't important - that's easy - it's the whole idea of
creating graphics without
any windows or interactivity. We have a ton of IDL stuff - all direct
graphics - that runs
(say) every minute in the background. Satellite data comes in every
minute, a script runs all of the
idl progs which generate .png files which are then immediately
available in a web browser.
With direct graphics this is very solid and is the basis for almost
100% of our operational graphics output.

My problem is that I've never seen any examples of such use with
object graphics. Software rendering should be fine.
Surely this is possible - or is object graphics always considered
within the context of an actual window generated on
the screen ?

Cheers

George.

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[Message index]

		Re: scripted object graphics question By: George Millward on Fri, 25 February 2011 14:59
		Re: scripted object graphics question By: KRDean on Fri, 25 February 2011 11:31
		Re: scripted object graphics question By: Karl[1] on Fri, 25 February 2011 09:36
		Re: scripted object graphics question By: George Millward on Fri, 25 February 2011 08:30
		Re: scripted object graphics question By: David Fanning on Fri, 25 February 2011 08:27
		Re: scripted object graphics question By: Michael Galloy on Fri, 25 February 2011 08:20
		Re: scripted object graphics question By: George Millward on Fri, 25 February 2011 06:17
		Re: scripted object graphics question By: David Fanning on Fri, 25 February 2011 05:43

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