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:arjen.mar...@deltares.nl]
Sent: Thursday, May 01, 2014 10:56 AM
To: Thomas Marsh
Cc: plplot-general@lists.sourceforge.net
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.ma...@warwick.ac.uk]<mailto:[mailto:t.r.ma...@warwick.ac.uk]>
Sent: Thursday, May 01, 2014 10:49 AM
To: Arjen Markus
Cc:
plplot-general@lists.sourceforge.net<mailto:plplot-general@lists.sourceforge.net>
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
<arjen.mar...@deltares.nl<mailto:arjen.mar...@deltares.nl>> 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.ma...@warwick.ac.uk<mailto:t.r.ma...@warwick.ac.uk>]
Sent: Thursday, May 01, 2014 9:46 AM
To:
plplot-general@lists.sourceforge.net<mailto:plplot-general@lists.sourceforge.net>
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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