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Copy pathcore_geometry_airfoil.py
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110 lines (92 loc) · 4.38 KB
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# -*- coding:utf-8 -*-
##Copyright 2013-2014 Guillaume Florent (florentsailing@gmail.com)
##
##This file is part of pythonOCC.
##
##pythonOCC is free software: you can redistribute it and/or modify
##it under the terms of the GNU Lesser General Public License as published by
##the Free Software Foundation, either version 3 of the License, or
##(at your option) any later version.
##
##pythonOCC 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 Lesser General Public License for more details.
##
##You should have received a copy of the GNU Lesser General Public License
##along with pythonOCC. If not, see <http://www.gnu.org/licenses/>.
#
# Explanations for this script can be found at
# http://pythonocc.wordpress.com/2013/04/01/using-external-airfoil-data-to-create-a-solid-wing/
#
import urllib2
from OCC.BRepBuilderAPI import BRepBuilderAPI_MakeFace
from OCC.BRepPrimAPI import BRepPrimAPI_MakePrism
from OCC.Geom2dAPI import Geom2dAPI_PointsToBSpline
from OCC.GeomAPI import geomapi
from OCC.gp import gp_Pnt, gp_Vec, gp_Pnt2d, gp_Pln, gp_Dir
from OCC.TColgp import TColgp_Array1OfPnt2d
from core_geometry_utils import make_wire, make_edge
class UiucAirfoil(object):
"""
Airfoil with a section from the UIUC database
"""
def __init__(self, chord, span, profile):
self.chord = chord
self.span = span
self.profile = profile
self.shape = self.make_shape()
def make_shape(self):
# 1 - retrieve the data from the UIUC airfoil data page
foil_dat_url = 'http://www.ae.illinois.edu/m-selig/ads/coord_seligFmt/%s.dat' % self.profile
f = urllib2.urlopen(foil_dat_url)
plan = gp_Pln(gp_Pnt(0., 0., 0.), gp_Dir(0., 0., 1.)) # Z=0 plan / XY plan
section_pts_2d = []
for line in f.readlines()[1:]: # The first line contains info only
# 2 - do some cleanup on the data (mostly dealing with spaces)
line = line.lstrip().rstrip().replace(' ', ' ').replace(' ', ' ').replace(' ', ' ')
data = line.split(' ') # data[0] = x coord. data[1] = y coord.
# 3 - create an array of points
if len(data) == 2: # two coordinates for each point
section_pts_2d.append(gp_Pnt2d(float(data[0])*self.chord,
float(data[1])*self.chord))
# 4 - use the array to create a spline describing the airfoil section
spline_2d = Geom2dAPI_PointsToBSpline(point2d_list_to_TColgp_Array1OfPnt2d(section_pts_2d),
len(section_pts_2d)-1, # order min
len(section_pts_2d)) # order max
spline = geomapi.To3d(spline_2d.Curve(), plan)
# 5 - figure out if the trailing edge has a thickness or not,
# and create a Face
try:
#first and last point of spline -> trailing edge
trailing_edge = make_edge(gp_Pnt(section_pts_2d[0].X(), section_pts_2d[0].Y(), 0.0),
gp_Pnt(section_pts_2d[-1].X(), section_pts_2d[-1].Y(), 0.0))
face = BRepBuilderAPI_MakeFace(make_wire([make_edge(spline), trailing_edge]))
except AssertionError:
# the trailing edge segment could not be created, probably because
# the points are too close
# No need to build a trailing edge
face = BRepBuilderAPI_MakeFace(make_wire(make_edge(spline)))
# 6 - extrude the Face to create a Solid
return BRepPrimAPI_MakePrism(face.Face(),
gp_Vec(gp_Pnt(0., 0., 0.),
gp_Pnt(0., 0., self.span))).Shape()
def point2d_list_to_TColgp_Array1OfPnt2d(li):
"""
List of gp_Pnt2d to TColgp_Array1OfPnt2d
"""
return _Tcol_dim_1(li, TColgp_Array1OfPnt2d)
def _Tcol_dim_1(li, _type):
"""
Function factory for 1-dimensional TCol* types
"""
pts = _type(0, len(li)-1)
for n, i in enumerate(li):
pts.SetValue(n, i)
return pts
if __name__ == '__main__':
from OCC.Display.SimpleGui import init_display
display, start_display, add_menu, add_function_to_menu = init_display()
airfoil = UiucAirfoil(50., 200., 'b737a')
display.DisplayShape(airfoil.shape, update=True)
start_display()