On 2015-05-22 12:15+0100 Phil Rosenberg wrote:
> Hi Alan
> I have just quickly looked at this and I believe I made this change by design.
>
> The reason being that c_plinit calls plP_bop which calls plPsubpInit
> which calls c_plschr before plsc->level is set to 1. Therefore a check
> for initialisation level means that plP_state does not get called and
> the state calls do not get placed in the buffer so it messes up
> renders from the buffer.
>
> I can't offhand remember what the need is for other state parameters.
> Do I remember correctly that colours can be set before plinit calls to
> give a different background colour?
Yes, a lot of possibilities are available as command-line options
(which are all run before plinit). Here are some from the result of
the -h command-line option (where I have removed a number I don't
think are relevant):
PLplot options:
-dev name Output device name
-o name Output filename
-px number Plots per page in x
-py number Plots per page in y
-geometry geom Window size/position specified as in X, e.g.,
400x300, 400x300-100+200, +100-200, etc.
-width width Sets pen width (0 <= width)
-bg color Background color (FF0000=opaque red, 0000FF_0.1=blue
with alpha of 0.1)
-ncol0 n Number of colors to allocate in cmap 0 (upper bound)
-ncol1 n Number of colors to allocate in cmap 1 (upper bound)
-db Double buffer X window output
-np No pause between pages
-dpi dpi Resolution, in dots per inch (e.g. -dpi 360x360)
-compression num Sets compression level in supporting devices
-cmap0 file name Initializes color table 0 from a cmap0.pal format
file in one of standard PLplot paths.
-cmap1 file name Initializes color table 1 from a cmap1.pal format
file in one of standard PLplot paths.
-drvopt option[=value][,option[=value]]* Driver specific options
-mfo PLplot metafile name Write the plot to the specified PLplot metafile
-mfi PLplot metafile name Read the specified PLplot metafile
I am sure you had good reasons for needing to insert the extra
plP_state calls, but from one test where I change character size
before running plinit, they definitely segfaulted when level is 0. So
although it is not the same test, if you remove the level protection,
I am pretty sure you will get a segfault (at least on Linux which is
more sensitive to memory management errors than Windows) using, e.g.,
-bg 0000FF_0.1.
Anyhow, this whole subject area is really beyond my understanding of
the PLplot code so I am going to leave it to you to figure out how to
avoid the segfaults while still satisfying the need not to mess up
renders from the buffer.
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
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).
__________________________
Linux-powered Science
__________________________
------------------------------------------------------------------------------
One dashboard for servers and applications across Physical-Virtual-Cloud
Widest out-of-the-box monitoring support with 50+ applications
Performance metrics, stats and reports that give you Actionable Insights
Deep dive visibility with transaction tracing using APM Insight.
http://ad.doubleclick.net/ddm/clk/290420510;117567292;y
_______________________________________________
Plplot-devel mailing list
Plplot-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/plplot-devel
