# $Id: BezierCurve.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.
##
##  You should have received a copy of the GNU General Public License
##  along with this program.  If not, see http://www.gnu.org/licenses/.
##

"""BezierCurve

level = 'normal'
topics = ['geometry', 'curve']
techniques = []

.. Description

BezierCurve
===========
This example illustrates the use of Bernstein polynomials to evaluate points
on a Bezier curve.
"""

from plugins.curve import *
from plugins.nurbs import *

predefined = ['514','1234','51414336','custom']

res = askItems([
    dict(name='pattern',choices=predefined),
    dict(name='custom',value=''),
    ])

if not res:
    exit()

s = res['pattern']
if s == 'custom':
    s = res['custom']

if not s.startswith('l:'):
    s = 'l:' + s
C = Formex(s).toCurve()

clear()
linewidth(2)
flat()

draw(C,bbox='auto',view='front')
draw(C.coords)
drawNumbers(C.coords)

setDrawOptions({'bbox':None})
n = 100
u = arange(n+1)*1.0/n
P = pointsOnBezierCurve(C.coords,u)
draw(P)

# End

