Re: [Plplot-general] Does plplot have an equivalent of PGPLOT's /xserve device?

[Thomas M. <t.r...@wa...>]

Yes, I had thought of this, but I consider the need to invoke a viewer for
each plot as quite an
inconvenience and prefer just to save to disk when I really want to
otherwise I will end up generating
piles of one-off plots.

tom


On 1 May 2014 12:07, Arjen Markus <Arj...@de...> wrote:

>  Hi Tom,
>
>
>
> I have been thinking of a completely different solution:
>
> -        Save the pictures in a file, like a PNG or a PDF file
>
> -        Run an appropriate viewer from within your program (in the
> background)
>
>
>
> This way:
>
> -        The computations can continue without involving multiprocessing
>
> -        The pictures remain visible and can even be rerieved afterwards
>
>
>
> Regards,
>
>
>
> Arjen
>
>
>
> *From:* Arjen Markus [mailto:Arj...@de...]
> *Sent:* Thursday, May 01, 2014 10:56 AM
> *To:* Thomas Marsh
> *Cc:* plp...@li...
> *Subject:* Re: [Plplot-general] Does plplot have an equivalent of
> PGPLOT's /xserve device?
>
>
>
> Hi Tom,
>
>
>
> Hm, you want to have several independent windows then. I have no
> particular experience with that sort of a set-up. I do think PLplot was
> designed with that in mind and I will have to leave it to others to help
> you with this.
>
>
>
> One thing that you would have to deal with is merging two different
> programming models – the event-driven one for the graphics and the
> procedural one for your computations. That is possible, for instance via
> multiprocessing, but I am not entirely sure what the easiest way would be.
> Perhaps others have looked into this already. It is intriguing though …
>
>
>
> Regards,
>
>
>
> Arjen
>
>
>
> *From:* Thomas Marsh [mailto:t.r...@wa...]
> *Sent:* Thursday, May 01, 2014 10:49 AM
> *To:* Arjen Markus
> *Cc:* plp...@li...
> *Subject:* Re: [Plplot-general] Does plplot have an equivalent of
> PGPLOT's /xserve device?
>
>
>
> Hi Arjen,
>
> thanks for your reply. plflush *without* a plend sort of works with "tk",
> but has significant problems -- see below. What I want to do is not quite
> as you summarise; sorry for not being clear. Its not so much that I want to
> resume plotting -- I imagine plflush would be good for this -- but I want
> the plot to finish but then to persist and not simply disappear. I
> sometimes have multiple such plots in windows on my screen, potentially
> produced by independent scripts. When I am done with them I can click the
> "X" at the top-right to get rid of them. I have not managed to replicate
> this way of working with plplot. When I used plflush without plend, my test
> script exited and the plot remained (with "tk" but not "xwin"). I ran the
> script a couple of times and produced two such plots. However, hearing my
> laptop's fan crank up, a look with "top" revealed two processes called
> "plserver" each running at 120% CPU [server talking to non-existent script
> perhaps?], so I think the absence of "plend" was not good, and this
> solution is not workable. If I stick plend back in, then I get the same
> instant disappearance of the plot when I set plspause(False) whether I use
> plflush or not, unsuprisingly I think, as I imagine plend flushed the
> graphics.
>
> tom
>
>
>
>
>
> On 1 May 2014 08:56, Arjen Markus <Arj...@de...> wrote:
>
> Hi Thomas,
>
>
>
> If I understand you correctly, you are looking for an on-screen device
> that displays the results, drops out of the event loop to allow the program
> to continue and does not close, so that later on you can resume the
> plotting. (As I do not know PGPLOT, I want to make sure I understand it.)
> plspause() will do that indeed, but the graphics buffer may get in the way.
>
>
>
> Try using plflush() at the end of drawing the graph. I have not tried it,
> but I think that will help.
>
>
> Regards,
>
>
>
> Arjen
>
>
>
>
>
> *From:* Thomas Marsh [mailto:t.r...@wa...]
> *Sent:* Thursday, May 01, 2014 9:46 AM
> *To:* plp...@li...
> *Subject:* [Plplot-general] Does plplot have an equivalent of PGPLOT's
> /xserve device?
>
>
>
> Hello, I am new to plplot, but I am trying to check it for a number of
> applications I have in mind within C++ and Python codes as a replacement
> for PGPLOT which I have used for years.  I am starting with the Python
> binding to explore plplot's features. The interactive device I use most of
> all with PGPLOT is "/xserve" which allows you to generate a plot that
> persists after a program / script exits and returns control to the
> terminal. I use this feature all the time. Within long running programs, it
> allows me to generate plots which I can look at while the program continues
> doing something else. With plplot's xwin or tk, I can get a plot that
> persists, but it seems to block until I have actively quitted it. I
> experimented with calling plspause(False) just before plend but then the
> plot just flashes briefly with tk and does not appear at all with xwin.
>
> I feel I am missing something obvious, but haven't found it yet. Thanks in
> advance for any help,
>
> tom
>
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