# $Id: Helix.py 2150 2012-01-16 20:33:48Z bverheg $ *** pyformex ***
##
##  This file is part of pyFormex 0.8.6  (Mon Jan 16 21:15:46 CET 2012)
##  pyFormex is a tool for generating, manipulating and transforming 3D
##  geometrical models by sequences of mathematical operations.
##  Home page: http://pyformex.org
##  Project page:  http://savannah.nongnu.org/projects/pyformex/
##  Copyright 2004-2011 (C) Benedict Verhegghe (benedict.verhegghe@ugent.be) 
##  Distributed under the GNU General Public License version 3 or later.
##
##
##  This program is free software: you can redistribute it and/or modify
##  it under the terms of the GNU General Public License as published by
##  the Free Software Foundation, either version 3 of the License, or
##  (at your option) any later version.
##
##  This program is distributed in the hope that it will be useful,
##  but WITHOUT ANY WARRANTY; without even the implied warranty of
##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
##  GNU General Public License for more details.
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##  You should have received a copy of the GNU General Public License
##  along with this program.  If not, see http://www.gnu.org/licenses/.
##
"""Helix

level = 'beginner'
topics = ['geometry']
techniques = ['color']

This is basically the same example as Torus.py, but it shows all steps.

"""
m = 36 # number of cells along helix
n = 10 # number of cells along circular cross section
reset()
setDrawOptions({'clear':True})
bgcolor(white)
F = Formex('l:164',[1,2,3]); draw(F)
F = F.replic(m,1.,0); draw(F)
F = F.replic(n,1.,1); draw(F)
F = F.translate(2,1.); draw(F,view='iso')
F = F.cylindrical([2,1,0],[1.,360./n,1.]); draw(F)
F = F.replic(5,m*1.,2); draw(F)
F = F.rotate(-10.,0); draw(F)
F = F.translate(0,5.); draw(F)
F = F.cylindrical([0,2,1],[1.,360./m,1.]); draw(F)
draw(F,view='right')
