Re: [Plplot-general] Working on PLplot 5.14 and gtk-fortran interfacing... (fwd)

[Alan W. I. <Ala...@gm...>]

__________________________
Alan W. Irwin

Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
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Linux-powered Science
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---------- Forwarded message ----------
Date: Wed, 27 Feb 2019 15:34:21 +0100
From: Ole Streicher <ol...@de...>
To: Alan W. Irwin <Ala...@gm...>
Subject: Re: [Plplot-general] Working on PLplot 5.14 and gtk-fortran
     interfacing...

Hi Alan, Vincent,

(Alan, please Cc to Vincent, and/or to the list)

On 27.02.19 02:37, Alan W. Irwin wrote:
> On 2019-02-26 14:54+0100 Vincent MAGNIN wrote:
>
>> I have tried some examples and successfully created output files using:
>>
>> < 3> ps         PostScript File (monochrome)
>> <11> svg        Scalable Vector Graphics (SVG 1.1)
>>
>> But for an unknown reason failed to plot anything directly on screen
>> (xwin, tk, qt drivers...) although plplot-driver-qt,
>> plplot-driver-wxwidgets and plplot-driver-xwin are installed. With
>> that kind of message (x33c):
>>
>> Enter device number or keyword: 1
>>
>> *** PLPLOT ERROR, IMMEDIATE EXIT ***
>> Can't open display
>> Program aborted
>

This is probably not connected to plplot. You need to have X11 running
and accessible by the client. So, depending how your setup of the
virtual machine is:

* if you do it directly in the VM window, make sure that you are in an
X11 environment of the VM

* if you login via ssh, use the "-X" option, check the DISPLAY variable
(`echo $DISPLAY`), and try to open a simple other program (like xterm or
so).


> With regard to the Debian Sid package for PLplot, Ole Streicher is the
> maintainer for that.  From my last contact with him my understanding
> is he is still working on getting the installed PLplot examples
> package to work just as well as they do for upstream.  The issue is
> that Debian packaging renames some components of PLplot so the example
> builds need to compensate for that.  I have CC'd Ole to give him a
> chance to summarize on list here where he is in that effort.


The problem for Python is, that the Debian python3-plplot package
includes the packages for all supported Python 3 versions, which
requires that the names shall not conflict. Therefore, they are renamend
in a consistent manner. Usually this is not important, since the
interface for Python 3 is the calling from, and this continues to work.
However, the plplot cmake logic does a number of extra consistency
checks that shoot one in the foot here. And it is not so trivial to
remove those checks (which are not needed for the Debian package, since
the installation already ensures that everything is on place).

Best regards


Ole