def points_to_bspline(pnts):
'''
Points to bspline
'''
pnts = point_list_to_TColgp_Array1OfPnt(pnts)
crv = GeomAPI_PointsToBSpline(pnts)
return crv.Curve()
def pipe():
# the bspline path, must be a wire
array2 = TColgp_Array1OfPnt(1, 3)
array2.SetValue(1, gp_Pnt(0, 0, 0))
array2.SetValue(2, gp_Pnt(0, 1, 2))
array2.SetValue(3, gp_Pnt(0, 2, 3))
bspline2 = GeomAPI_PointsToBSpline(array2).Curve()
path_edge = BRepBuilderAPI_MakeEdge(bspline2).Edge()
path_wire = BRepBuilderAPI_MakeWire(path_edge).Wire()
# the bspline profile. Profile mist be a wire
array = TColgp_Array1OfPnt(1, 5)
array.SetValue(1, gp_Pnt(0, 0, 0))
array.SetValue(2, gp_Pnt(1, 2, 0))
array.SetValue(3, gp_Pnt(2, 3, 0))
array.SetValue(4, gp_Pnt(4, 3, 0))
array.SetValue(5, gp_Pnt(5, 5, 0))
bspline = GeomAPI_PointsToBSpline(array).Curve()
profile_edge = BRepBuilderAPI_MakeEdge(bspline).Edge()
# pipe
pipe = BRepOffsetAPI_MakePipe(path_wire, profile_edge).Shape()
display.DisplayShape(profile_edge, color='WHITE', update=False)
display.DisplayShape(path_wire, color='BLUE', update=False)
display.DisplayShape(pipe, update=True)
def get_simple_bound(rndPts0):
_spl1 = GeomAPI_PointsToBSpline(rndPts0) #not a GeomAPI_PointsToBSplineSurface ??
_spl1.thisown = False
spl1 = _spl1.Curve()
spl1_adap = GeomAdaptor_HCurve(spl1)
spl1_adap.thisown = False
spl1_adap_h = spl1_adap.GetHandle()
bound1 = GeomFill_SimpleBound(spl1_adap_h, 0.001, 0.001)
bound1.thisown = False
bound1_h = bound1.GetHandle()
return spl1, bound1_h
def get_simple_bound(rndPts0):
_spl1 = GeomAPI_PointsToBSpline(
rndPts0) #not a GeomAPI_PointsToBSplineSurface ??
_spl1.thisown = False
spl1 = _spl1.Curve()
spl1_adap = GeomAdaptor_HCurve(spl1)
spl1_adap.thisown = False
spl1_adap_h = spl1_adap.GetHandle()
bound1 = GeomFill_SimpleBound(spl1_adap_h, 0.001, 0.001)
bound1.thisown = False
bound1_h = bound1.GetHandle()
return spl1, bound1_h
def DisplayG01Line(coor1, coor2):
array = TColgp_Array1OfPnt(1, 2)
array.SetValue(1, gp_Pnt(coor1[0], coor1[1], coor1[2]))
array.SetValue(2, gp_Pnt(coor2[0], coor2[1], coor2[2]))
bspline2 = GeomAPI_PointsToBSpline(array).Curve()
path_edge = BRepBuilderAPI_MakeEdge(bspline2).Edge()
display.DisplayColoredShape(path_edge, 'GREEN')
def prism():
# the bspline profile
array = TColgp_Array1OfPnt(1, 5)
array.SetValue(1, gp_Pnt(0, 0, 0))
array.SetValue(2, gp_Pnt(1, 2, 0))
array.SetValue(3, gp_Pnt(2, 3, 0))
array.SetValue(4, gp_Pnt(4, 3, 0))
array.SetValue(5, gp_Pnt(5, 5, 0))
bspline = GeomAPI_PointsToBSpline(array).Curve()
profile = BRepBuilderAPI_MakeEdge(bspline).Edge()
# the linear path
starting_point = gp_Pnt(0., 0., 0.)
end_point = gp_Pnt(0., 0., 6.)
vec = gp_Vec(starting_point, end_point)
path = BRepBuilderAPI_MakeEdge(starting_point, end_point).Edge()
# extrusion
prism = BRepPrimAPI_MakePrism(profile, vec).Shape()
display.DisplayShape(profile, update=False)
display.DisplayShape(starting_point, update=False)
display.DisplayShape(end_point, update=False)
display.DisplayShape(path, update=False)
display.DisplayShape(prism, update=True)
def make_bspline_edge(pyptlist, mindegree=3, maxdegree=8):
array = TColgp_Array1OfPnt(1, len(pyptlist))
pcnt = 1
for pypt in pyptlist:
gppt = make_gppnt(pypt)
array.SetValue(pcnt, gppt)
pcnt += 1
bcurve = GeomAPI_PointsToBSpline(array, mindegree, maxdegree).Curve()
curve_edge = BRepBuilderAPI_MakeEdge(bcurve)
return curve_edge.Edge()
def DisplayG02Arc(coor1, coor2, ARCCMD):
f = G02EXE(coor1, coor2, ARCCMD)
print(f)
pty = f[0]
center = f[1]
radius = f[2]
startA = f[3]
endA = f[4]
if endA - startA >= 0:
endA = -2 * math.pi + endA
dis = endA - startA
dis = dis / 30
array = TColgp_Array1OfPnt(1, 30)
if pty == 'xy':
for i in range(29):
array.SetValue(
i + 1,
gp_Pnt(radius * math.cos(startA + dis * i) + center[0],
radius * math.sin(startA + dis * i) + center[1],
coor1[2]))
array.SetValue(
30,
gp_Pnt(radius * math.cos(endA) + center[0],
radius * math.sin(endA) + center[1], coor1[2]))
elif pty == 'zx':
for i in range(29):
array.SetValue(
i + 1,
gp_Pnt(radius * math.sin(startA + dis * i) + center[1],
coor1[1],
radiud * math.cos(startA + dis * i) + center[0]))
array.SetValue(
30,
gp_Pnt(radius * math.sin(endA) + center[1], coor1[1],
radiud * math.cos(endA) + center[0]))
elif pty == 'yz':
for i in range(29):
array.SetValue(
i + 1,
gp_Pnt(coor1[0],
radiud * math.cos(startA + dis * i) + center[0],
radius * math.sin(startA + dis * i) + center[1]))
array.SetValue(
30,
gp_Pnt(coor1[0],
radiud * math.cos(endA) + center[0],
radius * math.sin(endA) + center[1]))
bspline2 = GeomAPI_PointsToBSpline(array).Curve()
path_edge = BRepBuilderAPI_MakeEdge(bspline2).Edge()
display.DisplayColoredShape(path_edge, 'RED')
def resample_curve_with_uniform_deflection(curve,
deflection=0.5,
degreeMin=3,
degreeMax=8,
continuity=GeomAbs_C2,
tolerance=1e-4):
"""
fits a bspline through the samples on `curve`
@param curve: TopoDS_Wire, TopoDS_Edge, curve
@param n_samples:
"""
crv = to_adaptor_3d(curve)
defl = GCPnts_UniformDeflection(crv, deflection)
with assert_isdone(defl, 'failed to compute UniformDeflection'):
print("Number of points:", defl.NbPoints())
sampled_pnts = [defl.Value(i) for i in range(1, defl.NbPoints())]
resampled_curve = GeomAPI_PointsToBSpline(
point_list_to_TColgp_Array1OfPnt(sampled_pnts), degreeMin, degreeMax,
continuity, tolerance)
return resampled_curve.Curve().GetObject()
def create_shape(self):
d = self.declaration
if not d.points:
raise ValueError("Must have at least two points")
# Poles and weights
pts = TColgp_Array1OfPnt(1, len(d.points))
set_value = pts.SetValue
# TODO: Support weights
for i, p in enumerate(d.points):
set_value(i + 1, gp_Pnt(*p))
self.shape = GeomAPI_PointsToBSpline(pts).Curve().GetObject()
def DisplayG00Line(coor1, coor2):
coors = [
coor1, [coor2[0], coor1[1], coor1[2]],
[coor2[0], coor2[1], coor1[2]], coor2
]
for i in range(3):
array = TColgp_Array1OfPnt(1, 2)
array.SetValue(1, gp_Pnt(coors[i][0], coors[i][1], coors[i][2]))
array.SetValue(
2, gp_Pnt(coors[i + 1][0], coors[i + 1][1], coors[i + 1][2]))
bspline2 = GeomAPI_PointsToBSpline(array).Curve()
path_edge = BRepBuilderAPI_MakeEdge(bspline2).Edge()
display.DisplayColoredShape(path_edge, 'YELLOW')
def makeSpline(cls, listOfVector):
"""
Interpolate a spline through the provided points.
:param cls:
:param listOfVector: a list of Vectors that represent the points
:return: an Edge
"""
pnts = TColgp_Array1OfPnt(0, len(listOfVector) - 1)
for ix, v in enumerate(listOfVector):
pnts.SetValue(ix, v.toPnt())
spline_geom = GeomAPI_PointsToBSpline(pnts).Curve()
return cls(BRepBuilderAPI_MakeEdge(spline_geom).Edge())
def test_stl(self, event=None):
#you probably dont have these
#occ_shape = load_stl("~/local/pythonocc-0.3/pythonOCC/src/samples/Level2/DataExchange/sample.stl")
#occ_shape = load_stl("~/local/legos/diver.stl") #http://adl.serveftp.org/lab/legos/diver.stl
#occ_shape = load_stl(os.path.join(os.path.curdir, "models/cube.stl"))
#make a box
occ_shape = BRepPrimAPI_MakeBox(Point(0, 0, 0), Point(1, 1, 1)).Shape()
display.DisplayShape(occ_shape)
shape = Face(occ_shape)
temp_points = list(set(shape.points))
#self.assertTrue(len(temp_points)>0)
#TODO: cluster points and make surfaces. but how do you compute the first parameter to build_plate?
surf = Surface()
surf.shape = occ_shape
surf.points = temp_points
#surf.approximate() #should be more like test_extract_shape_vertices
curve1 = GeomAPI_PointsToBSpline(point_list_1(surf.points)).Curve()
curve1.GetObject()
e1 = Edge(curve1.GetHandle())
display.DisplayShape(e1)
def fit_spline(points, degree_min=3, degree_max=8, continuity='C2', tol=1e-3):
"""Approximates a set of points on the plane with a B-spline.
Parameters
----------
points : ndarray
2D ndarray with N>=2 rows and 2 columns, representing the points on the plane, ordered
from one end point to the other. The first column gives the x, the second column gives the
the y coordinates of the points.
degree_min : int, optional
Minimum degree of the spline. The default is 3.
degree_max : int, optional
Maximum degree of the spline. The default is 8.
continuity : {'C0', 'G1', 'C1', 'G2', 'C2', 'C3', 'CN'}, optional
The continuity of the spline will be at least `continuity`. The default is 'C2'.
For their meanings, consult with
https://www.opencascade.com/doc/occt-7.4.0/refman/html/_geom_abs___shape_8hxx.html
tol : float, optional
The distance from the points to the spline will be lower than `tol`. The default is 1e-3.
Returns
-------
spline : Geom_BSplineCurve
For details on the resulting spline, see the OpenCASCADE documentation:
https://www.opencascade.com/doc/occt-7.4.0/refman/html/class_geom___b_spline_curve.html
Raises
------
ValueError
If the minimum degree of the B-spline to be constructed is greater than its maximum degree.
"""
if degree_min > degree_max:
raise ValueError(
'Minimum degree must not be lower than the maximum degree.')
# Create points from the input array that OCCT understands
n_point = np.size(points, 0)
pts = TColgp_Array1OfPnt(0, n_point - 1)
for i in range(n_point):
pts.SetValue(i, gp_Pnt(float(points[i][0]), float(points[i][1]), 0))
# Construct the spline
continuity = _spline_continuity_enum(continuity)
spline = GeomAPI_PointsToBSpline(pts, degree_min, degree_max, continuity,
tol).Curve()
return spline
def surface_from_curves():
'''
@param display:
'''
# First spline
array = []
array.append(gp_Pnt(-4, 0, 2))
array.append(gp_Pnt(-7, 2, 2))
array.append(gp_Pnt(-6, 3, 1))
array.append(gp_Pnt(-4, 3, -1))
array.append(gp_Pnt(-3, 5, -2))
pt_list1 = point_list_to_TColgp_Array1OfPnt(array)
SPL1 = GeomAPI_PointsToBSpline(pt_list1).Curve()
SPL1_c = SPL1.GetObject()
# Second spline
a2 = []
a2.append(gp_Pnt(-4, 0, 2))
a2.append(gp_Pnt(-2, 2, 0))
a2.append(gp_Pnt(2, 3, -1))
a2.append(gp_Pnt(3, 7, -2))
a2.append(gp_Pnt(4, 9, -1))
pt_list2 = point_list_to_TColgp_Array1OfPnt(a2)
SPL2 = GeomAPI_PointsToBSpline(pt_list2).Curve()
SPL2_c = SPL2.GetObject()
# Fill with StretchStyle
aGeomFill1 = GeomFill_BSplineCurves(SPL1, SPL2, GeomFill_StretchStyle)
SPL3 = Handle_Geom_BSplineCurve_DownCast(
SPL1_c.Translated(gp_Vec(10, 0, 0)))
SPL4 = Handle_Geom_BSplineCurve_DownCast(
SPL2_c.Translated(gp_Vec(10, 0, 0)))
# Fill with CoonsStyle
aGeomFill2 = GeomFill_BSplineCurves(SPL3, SPL4, GeomFill_CoonsStyle)
SPL5 = Handle_Geom_BSplineCurve_DownCast(
SPL1_c.Translated(gp_Vec(20, 0, 0)))
SPL6 = Handle_Geom_BSplineCurve_DownCast(
SPL2_c.Translated(gp_Vec(20, 0, 0)))
# Fill with CurvedStyle
aGeomFill3 = GeomFill_BSplineCurves(SPL5, SPL6, GeomFill_CurvedStyle)
aBSplineSurface1 = aGeomFill1.Surface()
aBSplineSurface2 = aGeomFill2.Surface()
aBSplineSurface3 = aGeomFill3.Surface()
display.DisplayShape(make_face(aBSplineSurface1, 1e-6))
display.DisplayShape(make_face(aBSplineSurface2, 1e-6))
display.DisplayShape(make_face(aBSplineSurface3, 1e-6), update=True)
def points_to_bspline(pnts):
pts = TColgp_Array1OfPnt(0, len(pnts) - 1)
for n, i in enumerate(pnts):
pts.SetValue(n, i)
crv = GeomAPI_PointsToBSpline(pts)
return crv.Curve()
def points_to_bspline(pnts, deg=3, periodic=False, tangents=None,
scale=False, continuity=GeomAbs_C2):
"""
Points to bspline: originally from pythonocc-utils, changed to allow numpy
arrays as input
Paramters
---------
pnts : list or numpy array
array of x, y, z points
deg : integer
degree of the fitted bspline
periodic : Bool (default=False)
If true, OCC.GeomAPI_Interpolate will be used instead of the
GeomAPI_PointsToBspline. Curve tangent vectors can then be
enforced at the interpolation pnts
tangents : array (default=None)
list of [x,y,z] tangent vectors to be specificied at points:
if only 2 tangents are specified, these will be enforced at the
start and end points, otherwise tangents should have the same length
as pnts and will be enforced at each point.
Scale : Bool (default=False)
Will scale the tangents (gives a smoother Periodic curve if False)
continuity : OCC.GeomAbs.GeomAbs_XX type (default C2)
The order of continuity (C^0, C^1, C^2, G^0, ....)
Returns
-------
crv : OCC.Geom.BSplineCurve
Notes
-----
"""
if not periodic and (tangents is None):
_type = TColgp_Array1OfPnt
pnts = point_array_to_TColgp_PntArrayType(pnts, _type)
# Fit the curve to the point array
deg_min = deg
deg_max = deg
crv = GeomAPI_PointsToBSpline(pnts, deg_min, deg_max, continuity).Curve()
else:
_type = TColgp_HArray1OfPnt
pnts = point_array_to_TColgp_PntArrayType(pnts, _type)
tol = 0.001
interp = GeomAPI_Interpolate(pnts.GetHandle(), periodic, tol)
if tangents is not None:
N = tangents.shape[0]
if N == 2:
try:
interp.Load(gp_Vec(*tangents[0, :]), gp_Vec(*tangents[1, :]),
scale)
except:
# Python 3 issue: using * on numpy array breaks gp_Vec
interp.Load(gp_Vec(*tangents[0, :].tolist()),
gp_Vec(*tangents[1, :].tolist()),
scale)
else:
tan_array = TColgp_Array1OfVec(1, N)
for i in range(1, N + 1):
try:
tan_array.SetValue(i, gp_Vec(*tangents[i - 1, :]))
except TypeError:
# Python 3 issue: using * on numpy array breaks gp_Vec
tan_array.SetValue(i, gp_Vec(*tangents[i - 1, :].tolist()))
tan_flags = TColStd_HArray1OfBoolean(1, N)
tan_flags.Init(True) # Set all true i.e. enforce all tangents
interp.Load(tan_array, tan_flags.GetHandle(), scale)
interp.Perform()
crv = interp.Curve()
return crv
def get_simple_bound(pts):
spl1 = GeomAPI_PointsToBSpline(pts).Curve()
spl1_adap_h = GeomAdaptor_HCurve(spl1).GetHandle()
bound1_h = GeomFill_SimpleBound(spl1_adap_h, 0.001, 0.001).GetHandle()
return spl1, bound1_h
