def test_project_point_on_curve(self):
'''Test: project point on curve'''
P = gp_Pnt(1., 2., 3.)
radius = 5.
C = Geom_Circle(gp_XOY(), radius)
PPC = GeomAPI_ProjectPointOnCurve(P, C)
N = PPC.NearestPoint()
self.assertIsInstance(N, gp_Pnt)
NbResults = PPC.NbPoints()
edg = make_edge(C)
self.assertFalse(edg.IsNull())
if NbResults > 0:
for i in range(1, NbResults + 1):
Q = PPC.Point(i)
self.assertIsInstance(Q, gp_Pnt)
distance = PPC.Distance(i)
# in any case, it should be > 1
self.assertGreater(distance, 1.)
pstring = "N : at Distance : " + repr(PPC.LowerDistance())
for i in range(1, NbResults + 1):
Q = PPC.Point(i)
self.assertIsInstance(Q, gp_Pnt)
distance = PPC.Distance(i)
# in any case, it should be > 1
self.assertGreater(distance, 1.)
pstring = "Q" + repr(i) + ": at Distance :" + repr(PPC.Distance(i))
print(pstring)
def project_mesh_to_cad_2d(mesh, cad):
from OCC.Core.BRepAdaptor import BRepAdaptor_Curve
from OCC.Core.gp import gp_Pnt
from OCC.Core.GeomAPI import GeomAPI_ProjectPointOnCurve
coorddata = mesh.coordinates.dat.data
ids = mesh.exterior_facets.unique_markers
filt = lambda arr: arr[numpy.where(arr < mesh.coordinates.dof_dset.size)[0]]
boundary_nodes = {id: filt(mesh.coordinates.function_space().boundary_nodes(int(id))) for id in ids}
for (id, edge) in zip(ids, cad.edges()):
owned_nodes = boundary_nodes[id]
for other_id in ids:
if id == other_id:
continue
owned_nodes = numpy.setdiff1d(owned_nodes, boundary_nodes[other_id])
curve = BRepAdaptor_Curve(edge)
for node in owned_nodes:
pt = gp_Pnt(*coorddata[node, :], 0)
proj = GeomAPI_ProjectPointOnCurve(pt, curve.Curve().Curve())
if proj.NbPoints() > 0:
projpt = proj.NearestPoint()
coorddata[node, :] = projpt.Coord()[0:2]
else:
warnings.warn("Projection of point %s onto curve failed" % coorddata[node, :])
def project_point_on_curve():
'''
'''
point_to_project = gp_Pnt(1., 2., 3.)
radius = 5.
# create a circle, centered at origin with a given radius
circle = Geom_Circle(gp_XOY(), radius)
display.DisplayShape(circle)
display.DisplayShape(point_to_project, update=True)
display.DisplayMessage(point_to_project, "P")
# project the point P on the circle
projection = GeomAPI_ProjectPointOnCurve(point_to_project,
circle)
# get the results of the projection
# the point
projected_point = projection.NearestPoint()
# the number of possible results
nb_results = projection.NbPoints()
print("NbResults : %i" % nb_results)
pstring = "N : at Distance : %f" % projection.LowerDistance()
display.DisplayMessage(projected_point, pstring)
# thre maybe many different possible solutions
if nb_results > 0:
for i in range(1, nb_results+1):
Q = projection.Point(i)
distance = projection.Distance(i)
pstring = "Q%i: at Distance :%f" % (i, distance)
display.DisplayShape(Q)
display.DisplayMessage(Q, pstring)
def other():
for (id, edge) in zip(ids, cad.edges()):
owned_nodes = boundary_nodes[id]
for other_id in ids:
if id == other_id:
continue
owned_nodes = numpy.setdiff1d(owned_nodes,
boundary_nodes[other_id])
curve = BRepAdaptor_Curve(edge)
for node in owned_nodes:
pt = gp_Pnt(*coorddata[node, :], 0)
proj = GeomAPI_ProjectPointOnCurve(pt, curve.Curve().Curve())
if proj.NbPoints() > 0:
projpt = proj.NearestPoint()
coorddata[node, :] = projpt.Coord()[0:2]
else:
warnings.warn("Projection of point %s onto curve failed" %
coorddata[node, :])
def project_mesh_to_cad_2d(mesh, cad):
from OCC.Core.BRepAdaptor import BRepAdaptor_Curve
from OCC.Core.gp import gp_Pnt
from OCC.Core.GeomAPI import GeomAPI_ProjectPointOnCurve
coorddata = mesh.coordinates.dat.data
ids = mesh.exterior_facets.unique_markers
filt = lambda arr: arr[numpy.where(arr < mesh.coordinates.dof_dset.size)[0]
]
boundary_nodes = {
id: filt(mesh.coordinates.function_space().boundary_nodes(
int(id), "topological"))
for id in ids
}
for id_ in ids:
for node in boundary_nodes[id_]:
#print(node)
coords = coorddata[node, :]
best_coords = coords
dist_old = np.inf
for edge in cad.edges():
curve = BRepAdaptor_Curve(edge)
pt = gp_Pnt(*coorddata[node, :], 0)
proj = GeomAPI_ProjectPointOnCurve(pt, curve.Curve().Curve())
if proj.NbPoints() > 0:
projpt = proj.NearestPoint()
projected_coords = np.array(projpt.Coord()[0:2])
dist = np.linalg.norm(coords - projected_coords)
if dist_old > dist:
best_coords = projected_coords
dist_old = dist
#print(coords, projected_coords, np.linalg.norm(coords-projected_coords))
#print(distances)
coorddata[node, :] = best_coords
return
wireAdaptor = BRepAdaptor_CompCurve(wire)
curve = BRepAdaptor_HCompCurve(wireAdaptor)
tol = 1e-7
max_segments = 200
max_degrees = 12
approx = Approx_Curve3d(curve, tol, GeomAbs_C2, max_segments, max_degrees)
if (approx.IsDone() and approx.HasResult()):
an_approximated_curve = approx.Curve()
# there are two ways to project a point on this curve,
# they both give the same restult
# 1st solution: using GeomAPI_ProjectPointOnCurve
point_to_project = gp_Pnt(1., 2., 3.)
projection = GeomAPI_ProjectPointOnCurve(point_to_project,
an_approximated_curve)
# get the results of the projection
projected_point = projection.NearestPoint()
# the number of possible results
nb_results = projection.NbPoints()
print("NbResults : %i" % nb_results)
print("Distance :", projection.LowerDistance())
# 2nd solution : using ShapeAnalysis_Curve().Project
tolerance = 1e-7
proj = gp_Pnt()
distance, parameter = ShapeAnalysis_Curve().Project(an_approximated_curve,
point_to_project,
tolerance, proj)
print("Distance :", distance)