Hi there,

This question relates to the Haskell programming language.

I work in Mac OS X and am learning Haskell through Paul Hudak's
excellent "School of Expression" textbook (ISBN 0-521-64408-9).  I am
using the Hugs interpreter (version March 2005).  When I try to use
his function polyBezier to draw a Bezier curve, I am told that X11
(the windowing system for UNIX-based machines) does not support them
and instead it draws me a "poly line".  Yet it works on Windows
computers as they use a different graphics system.

I found out that X11 does not provide any primitives to draw cubic
splines but a new function could be written for this.  It should be a
simple enough matter to write a bezier-curve implementation in terms
of the existing polyline functions?

I don't know why the SOE authors don't provide such a function for
UNIX users.  But if you can help, please do.

Thank you