Thanks Alan
I've hunted through the code and found that although some properties appear to
be able to be set before initialisation they are saved in the plstream and the
commands don't make it to the drivers until after plinit is called at least
(because until this point the driver doesn't even exist). plwidth() had the
following comment though:
//
// Set pen width. Can be done any time, but before calling plinit is best
// since otherwise it may be volatile (i.e. reset on next page advance).
// If width < 0 or is unchanged by the call, nothing is done.
//
Is the implication that if the user sets the pen width before initialisation
that this pen width should be used at the beginning of each page? I've scanned
through the svg and cairo code and this doesn't appear to be the case for these
drivers and such functionality is not documented in the manual.
In case anyone is interested in the progress of this work, I've modified the
wxwidgets driver so that the wxWidgets window runs in a seaparate thread to the
main thread where calls to the plplot functions occur. This is now functioning
for the three backends on Windows, however freetype is not yet running. It has
beens uch a large job because event driven functions in the wxFrame must not
access the plstreams while the main thread is doing so. This either requires
protecting the plstreams with mutexes or simply not accessing the plstream from
the window. I've gone for the second option as I think the first is a huge job,
especially given the use of the global plsc pointer. It turns out that
plfreetype.c makes use of the plstream a lot so that's the next big task.
There are some more minor items that i haven't yet tackled, such as setting
custom keypress behaviour. I think the best (maybe only) way to do this would
be to add extra options to the escape function calls so that when some options
are set they can be sent from the plstream to the driver where it is easy to
control communication, rather than have a window event have to poll the
plstream, which can cause race conditions. Unless someone on the list tells me
that this shouldn't be done I'll go ahead with this approach.
Alan - off topic, that sounds like some very interesting work, I guess we won't
hear from you much in the near future then.
Phil
------------------------------------------------------------------------------
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and
their applications. This 200-page book is written by three acclaimed
leaders in the field. The early access version is available now.
Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
_______________________________________________
Plplot-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/plplot-devel
