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Re: Object Graphics when using 'stop' [message #30681 is a reply to message #30555] Fri, 10 May 2002 09:44 Go to previous message
Rick Towler is currently offline  Rick Towler
Messages: 821
Registered: August 1998
Senior Member
Ahhh, widgets....

Issuing the STOP command stops xmanager's ability to process events. Since
OG widget programs rely on events to draw the view to the window this never
happens and you get the black window of despair. Direct graphics widget
programs will possibly draw the initial plot but will not be able to process
events either.

I can't explain the details but I'm sure someone else in the group can.

A non widget program will run as expected after issuing a stop. I created a
simple non-widget OG program that I could pass data to plot after issuing a
stop. You could craft yourself some nice little tools to do line and
surface plots which automagically scale and rotate objects. You lose the
ability to manipulate them and cleanup is awkward. You would probably have
to use READ to wait for a keypress before destroying the objects.

Or maybe you just look at your data using DG. So that's why they are
keeping DG around....

-Rick


"Randall Skelton" <rhskelto@atm.ox.ac.uk> wrote in message
news:Pine.LNX.4.33.0205101048540.16883-100000@mulligan.atm.o x.ac.uk...
> With regard to more context, imagine a procedure aptly named 'test':
>
> PRO TEST
> DATA = BESELJ(SHIFT(DIST(40),20,20)/2,0)
> STOP
> END
>
> When I run this in IDL I get:
>
> IDL> test
> % Compiled module: TEST.
> % Compiled module: DIST.
> % Stop encountered: TEST 5 /blah/.../blah/test.pro
>
> If I try and plot 'data' with an object graphics routine like
> 'fsc_surface', or any of the RSI example code 'show3_track',
> 'test_surface' all I get is a black window? Moreover, all of these
> routines have built-in data (in the event that the user doesn't pass an
> array) and even this fails to display when my routine is stopped. Of
> course, once I continue the program and allow it to finish, everything is
> fine and the object-graphics window fills with the expected surface.
>
> Any help would be greatly appreciated!
>
> Cheers,
> Randall
>
> IDL 5.3 (soon to be 5.5); RH Linux 7.x; XFree 4.0.3
>
> On Fri, 3 May 2002, Rick Towler wrote:
>
>> Hi Randall,
>>
>> Can you provide some more context? I just stopped an OG program,
>> manipulated objects and drew the window. Is that what you are trying to
do?
>>
>> -Rick
>>
>>
>> "Randall Skelton" <rhskelto@atm.ox.ac.uk> wrote in message
>> news:Pine.LNX.4.33.0205021605500.27169-100000@mulligan.atm.o x.ac.uk...
>>> Hi all,
>>>
>>> I'm using IDL 5.3 under linux and I have a curious question. For
>>> perspective, I tend to do most of my coding from the command line and
not
>>> the gui (yes, I do use the 'stop' command a lot). I routinely check
the
>>> contents of variables with 'print' and 'plot' commands to determine if
my
>>> calculations look reasonable. My problem is, once I have issued a
'stop'
>>> command I cannot use object graphics to plot anything. All I get is a
>>> black background window that is usually dissociated from xmanager.
I'm
>>> sure there is a good reason for this but I'm stymied. Any thoughts?
>>>
>>> Cheers,
>>> Randall
>>>
>>
>>
>>
>

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