filling patterns for pie chart

[Maciej Gawinecki]

I've been looking for solution to gnuplot pie chart with black-and-white 
filling patterns (like bars in that gnuplot test command renders: 
https://hepblog.uchicago.edu/hep/hep4/wp-content/uploads/2008/01/gnuplot.png)

I know that Octave has a simple function pie() for drawing pie charts. E.g.  I 
found this example:

pie ([3, 2, 1], [0, 0, 1], {"Cheddar", "Swiss", "Camembert"});
colormap([1,0,0;0,1,0;0,0,1;1,1,0;1,0,1;0,1,1]);
print('fig.jpg','-djpg');

Can any one there can explain me how can I replace colors with black-and-white 
filling patterns?

Regards,
Maciej

ps. As an alternative I've tried Perl Chart::Gnuplot::Pie library but 
Chart::Gnuplot library does not work for me (Windows XP). There is a known 
issue on that (http://www.perlmonks.org/?node_id=721599), and even turning 
back to version 0.05 of Perl library for gnuplot does not help.