accessing internals of graphic objects

[Naveen Garg]

Is it possible to get the data represented in a line or patch (filled polygon) graphics object as an array or matrix?

Is there a way to access the internals of a an axis object created with gca() ?

Is it possible to save plot objects to file for later use? 

the builtin get and set functions seem minimally documented, do they allow this ? 

http://www.gnu.org/software/octave/doc/interpreter/Manipulating-Existing-Plots.html#Manipulating-Existing-Plots