mexGet and mexSet

[David Bateman]

As we now have graphic  handles, we should implement the mexGet and
mexSet functions. However, there is no functionality exported from
graphics.cc except through DEFUN_DLD functions. The attached patch
exports a simple means of getting/setting a property from graphics.cc,
includes a new declaration of these functions in graphics.h, uses these
functions to write mexGet and mexSet, and finally includes a piece of
test code. After patching and rebuilding Octave, the  example code can
be used as follows

mkoctfile --mex myprop.c
h = plot(1:10,1:10)
get (h, "Color")
myprop(h, "Color")
myprop(h, "Color", [1, 0, 0])
myprop(h, "Color")
drawnow

Which returns

octave:1> mkoctfile --mex myprop.c
octave:2> h = plot(1:10,1:10)
h = -2
octave:3> get (h, "Color")
ans =

   0   0   1

octave:4> myprop(h, "Color")
ans =

   0   0   1

octave:5> myprop(h, "Color", [1, 0, 0])
ans =

   0   0   1

octave:6> myprop(h, "Color")
ans =

   1   0   0

octave:7> drawnow

and demonstrates that the line color has been changed..
 

-- 
David Bateman                                address@hidden
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