{{Macro |Name=ImportAirfoil |Description=Macro for Airfoil coordinates import. |Author=Miloš Petrašinović |Download=[https://wiki.freecadweb.org/File:ImportAirfoil.svg ToolBar Icon] |Date=2022-01-08 |Version=1.0.0 |FCVersion=0.18.4 and above |SeeAlso=[https://github.com/VAZMFB/FreeCAD-ImportAirfoil Github repository] }}
Macro for Airfoil coordinates import. It is possible, using simple dialog, to scale the airfoil, rotate, translate in the plane, translate along the span, select the plane and the main axis, as well as turn the geometry into a sketch. It is possible to import coordinates saved in the most commonly used formats.
Run the macro program and follow the instructions.
ToolBar Icon 
ImportAirfoil.FCMacro
{{MacroCode|code=
Author: Milos D. Petrasinovic mpetrasinovic@mas.bg.ac.rs
Copyright (C) 2022 Milos Petrasinovic info@vazmfb.com
along with this program. If not, see https://www.gnu.org/licenses/.
Name = 'ImportAirfoil' Comment = 'Airfoil import macro' Author = 'Milos Petrasinovic mpetrasinovic@mas.bg.ac.rs' Version = '1.0.0' Date = '2022-01-06' License = 'GPL-3.0-or-later' Web = 'https://github.com/VAZMFB/FreeCAD-ImportAirfoil' Wiki = 'https://wiki.freecadweb.org/Macro_ImportAirfoil' Icon = 'ImportAirfoil.svg' Help = 'Run the macro program and follow the instructions!' Status = 'stable' Requires = 'Freecad >= 0.19' Communication = 'https://github.com/VAZMFB/FreeCAD-ImportAirfoil/issues/' Files = 'ImportAirfoil.svg'
import FreeCAD as App from PySide import QtCore, QtGui from PySide.QtGui import QFileDialog, QLineEdit, QRadioButton, QMessageBox import Draft, importAirfoilDAT import numpy as np import subprocess import sys import os import re
global filename global nameFile
msgBox = QtGui.QMessageBox() msgBox.setWindowTitle("ImportAirfoil") msgBox.setText("In the next window, select the file with the coordinates of the airfoil.") msgBox.exec_()
try: filename, filefilter = QtGui.QFileDialog.getOpenFileName(QtGui.qApp.activeWindow(), 'Select the file with the coordinates:', '.dat;.txt;.af') except Exception: param = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Macro") path = param.GetString("MacroPath", "") + "/" filename, filefilter = QFileDialog.getOpenFileName(None, "Select the file with the coordinates:", path, ".dat;.txt;.af")
nameFile = filename.split("/")[-1][:-4]
class DrawAP(): def init(self): self.dialog = None self.lt = 0 self.alpha = 0 self.h0 = 0 self.plane = None self.mirror = None self.dh = 0 self.dv = 0 self.db = 0 self.sketch = None
# Dialog window
self.dialog = QtGui.QDialog()
self.dialog.resize(350, 100)
self.dialog.setWindowTitle("ImportAirfoil")
la = QtGui.QVBoxLayout(self.dialog)
tx = QtGui.QLabel("Length of airfoil chord [mm]:")
la.addWidget(tx)
self.lt = QtGui.QLineEdit("1000")
la.addWidget(self.lt)
tx = QtGui.QLabel("The angle of rotation [deg]:")
la.addWidget(tx)
self.alpha = QtGui.QLineEdit("0")
la.addWidget(self.alpha)
tx = QtGui.QLabel("The relative position of the axis of rotation [% of chord]:")
la.addWidget(tx)
self.h0 = QtGui.QLineEdit("25")
la.addWidget(self.h0)
tx = QtGui.QLabel("Plane selection [XY = 1, YZ = 2, ZX = 3]:")
la.addWidget(tx)
self.plane = QtGui.QLineEdit("1")
la.addWidget(self.plane)
tx = QtGui.QLabel("Vertical mirroring [NO = 0, YES = 1]:")
la.addWidget(tx)
self.mirror = QtGui.QLineEdit("0")
la.addWidget(self.mirror)
tx = QtGui.QLabel("Change axis [NO = 0, YES = 1]:")
la.addWidget(tx)
self.flip = QtGui.QLineEdit("0")
la.addWidget(self.flip)
tx = QtGui.QLabel("Translation along the horizontal axis [mm]:")
la.addWidget(tx)
self.dh = QtGui.QLineEdit("0")
la.addWidget(self.dh)
tx = QtGui.QLabel("Translation along the vertical axis [mm]:")
la.addWidget(tx)
self.dv = QtGui.QLineEdit("0")
la.addWidget(self.dv)
tx = QtGui.QLabel("Translation along the span [mm]:")
la.addWidget(tx)
self.db = QtGui.QLineEdit("0")
la.addWidget(self.db)
tx = QtGui.QLabel("Create a Sketch [NO = 0, YES = 1]:")
la.addWidget(tx)
self.sketch = QtGui.QLineEdit("0")
la.addWidget(self.sketch)
# Add OK / Cancel buttons
okBox = QtGui.QDialogButtonBox(self.dialog)
okBox.setOrientation(QtCore.Qt.Horizontal)
okBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok)
la.addWidget(okBox)
QtCore.QObject.connect(okBox, QtCore.SIGNAL("accepted()"), self.proceed)
QtCore.QObject.connect(okBox, QtCore.SIGNAL("rejected()"), self.close)
QtCore.QMetaObject.connectSlotsByName(self.dialog)
self.dialog.show()
self.dialog.exec_()
def proceed(self):
global filename
global nameFile
try:
lt = float(self.lt.text())
alpha = float(self.alpha.text())
h0 = float(self.h0.text())
plane = float(self.plane.text())
mirror = float(self.mirror.text())
flip = float(self.flip.text())
dh = float(self.dh.text())
dv = float(self.dv.text())
db = float(self.db.text())
sketch = float(self.sketch.text())
af = importAirfoil(str(filename))
# Open trailing edge
af[1][0] += 0.000001;
points = []
for i in range(len(af[0])):
point = App.Vector(af[0][i], af[1][i], 0)
points.append(point)
Line1 = Draft.makeLine(points[0], points[-1])
Line1.Label = nameFile + "_(TEdge)"
BSpline1 = Draft.makeBSpline(points, closed=False)
BSpline1.Label = nameFile + "_(BSpline)"
# Group elements
Group1 = App.activeDocument().addObject('App::DocumentObjectGroup', 'Group')
Group1.Label = nameFile + "_(Group)"
Group1.addObject(Line1)
Group1.addObject(BSpline1)
App.activeDocument().recompute()
# Scale airfoil
if App.Version()[1] < "19":
Draft.scale([Line1, BSpline1], App.Vector(lt, lt, lt), center=App.Vector(0.0, 0.0, 0.0), copy=False, legacy=True)
else:
Draft.scale([Line1, BSpline1], App.Vector(lt, lt, lt), center=App.Vector(0.0, 0.0, 0.0), copy=False)
# Rotate airfoil
Draft.rotate([Line1, BSpline1], -alpha, center=App.Vector(lt*h0/100, 0, 0), axis=App.Vector(0, 0, 1), copy=False)
# Mirror
if mirror == 1:
Draft.rotate([Line1, BSpline1], 180, center=App.Vector(0, 0, 0), axis=App.Vector(0, 1, 0), copy=False)
# Move airfoil in plane
Draft.move([Line1, BSpline1], App.Vector(dh, dv, 0.0), copy=False)
# Change axis
Draft.rotate([Line1, BSpline1], -90, center=App.Vector(0, 0, 0), axis=App.Vector(0, 0, 1), copy=False)
# Change plane
if plane == 2: # YZ
Draft.rotate([Line1, BSpline1], 90, center=App.Vector(0, 0, 0), axis=App.Vector(0, 0, 1), copy=False)
Draft.rotate([Line1, BSpline1], 90, center=App.Vector(0, 0, 0), axis=App.Vector(0, 1, 0), copy=False)
elif plane == 3: # ZX
Draft.rotate([Line1, BSpline1], 90, center=App.Vector(0, 0, 0), axis=App.Vector(1, 0, 0), copy=False)
Draft.rotate([Line1, BSpline1], -90, center=App.Vector(0, 0, 0), axis=App.Vector(0, 1, 0), copy=False)
# Make sketch
if sketch == 1:
App.activeDocument().recompute()
Sketch1 = Draft.makeSketch([Line1, BSpline1], autoconstraints=True)
Sketch1.Label = nameFile + "_(Sketch)"
# Move airfoil
if plane == 2: # YZ
Draft.move([Line1, BSpline1], App.Vector(db, 0, 0), copy=False)
if sketch == 1:
Draft.move(Sketch1, App.Vector(0, 0, db), copy=False)
elif plane == 3: # ZX
Draft.move([Line1, BSpline1], App.Vector(0, db, 0), copy=False)
if sketch == 1:
Draft.move(Sketch1, App.Vector(0, 0, db), copy=False)
else:
Draft.move([Line1, BSpline1], App.Vector(0, 0, db), copy=False)
if sketch == 1:
Draft.move(Sketch1, App.Vector(0, 0, db), copy=False)
except Exception as e:
exc_type, exc_obj, exc_tb = sys.exc_info()
App.Console.PrintError("Error = "+str(e)+"\n")
App.Console.PrintError(" Error line number = "+str(exc_tb.tb_lineno)+"\n")
msgBox = QtGui.QMessageBox()
msgBox.setWindowTitle("Error")
msgBox.setText("An error occurred, see Report window for more information!")
msgBox.setWindowModality(QtCore.Qt.NonModal)
msgBox.show()
App.activeDocument().recompute()
Gui.SendMsgToActiveView("ViewFit")
self.close() # close the window
def close(self):
self.dialog.hide() # close the window
def scanf(l): # scanf('%f %f', l) found = re.compile('([-+]?(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][-+]?\d+)?)\s+([-+]?(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][-+]?\d+)?)').search(l) casts = [float, float] if found: groups = found.groups() return tuple([castsi for i in range(len(groups))])
def importAirfoil(file): af = []; if(os.path.isfile(file)): with open(file) as f: ls = [line.strip() for line in f]
x = []
y = []
h = 1
for l in ls:
if l:
data = scanf(l);
if(h and data and len(data) == 2 and data[0] > -0.1
and data[0] < 1.1 and data[1] > -1.1
and data[1] < 1.1):
# First coordinate if there is both x and y data
# Range for x is [-0.1, 1.1] and for y is [-1.1, 1.1]
h = 0;
x.append(data[0])
y.append(data[1])
elif(not h and data and len(data) == 2):
x.append(data[0])
y.append(data[1])
if(len(x) > 0):
if(any(xi >= 1.1 for xi in x)):
# Koordinate su verovatno pomnozene sa 100
x = np.divide(x, 100)
y = np.divide(y, 100)
d = np.diff(x)
if(sum([di < 0 for di in d]) == 1):
# Lednicer format
i = np.where(d < 0)[0][0]
x = [*np.flip(x[:i+1]).tolist(), *x[i+1:]]
y = [*np.flip(y[:i+1]).tolist(), *y[i+1:]]
af = np.array([x[1:-1], y[1:-1]])
_, idx = np.unique(af, axis=1, return_index=True)
af = [[x[0], *af[0][np.sort(idx)].tolist(), x[-1]],
[y[0], *af[1][np.sort(idx)].tolist(), y[-1]]]
return af
if os.path.isfile(filename): DrawAP() else: msgBox = QtGui.QMessageBox() msgBox.setWindowTitle("Error") msgBox.setText("No valid file with coordinates!") msgBox.setWindowModality(QtCore.Qt.NonModal) msgBox.show() }}
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