unlimited windows patch

[Daniel J S. <dan...@ie...>]

Folks,

I've updated some patches on SourceForge (with much of Petr's help)
that I'd like people to test and consider for integration into Gnuplot.  One
is a moderate length patch for unlimited X11 windows.  The other is the
longer patch for image and binary data file support.  I will briefly discuss
the two in separate emails...

Patch 774822 Unlimited plot windows for X11 terminals.

linked_list_103003.diff

The unlimited X11 windows patch consists of the one file listed above.
The strategy here was to take the large table containing information
about the window and add a few pointers for a doubly-linked list and
an identifier (the window #).  Then there is a large chunk of code to
support the linked list.  It actually is fairly straightforward with a few
short routines like "Add_To_List", "Remove_From_List", etc.  The only
tricky part was robustly cleaning up plots that are deleted via the OS,
e.g., pressing the close button of the window.  That requires a queue
for deleting plots because otherwise the OS error handler could delete
a plot that gnuplot_x11 is currently accessing.  In any case, it has been
very robust and I can't recall ever seeing gnuplot_x11 go defunct with
this strategy.  I've also run this through Octave to generate a couple
hundred plots on the screen and it works fine.

So, in summary, the structure of 16 plots has been replaced by a linked
list.  Petr has tested the patch and also gave some good suggestions
for additions.  Also, the issue of closing a window has come up on the
list, so I added a "close", although there may be an issue with the
different pipes.  (Try it, see if it suitable.)  The X11_options() routine
has been cleaned up to do reasonable sanity checks and to not change
anything unless a valid "set term" command is entered.  This is more
in line with the manner in which "plot" and "splot" behave.

There is documentation in Gnuplot, but some examples are

set term x11 145 title "Hello World"
plot sin(x)
set term x11 close

Dan


-- 

Dan Sebald
email: daniel . sebald @ ie ee . o rg
URL: ht tp://acer-access.c om/~dsebald @ acer-access.c om/