def region_as_splinegon(boundary_splines):
"""Represents a region as a splinegon.
Based on the combined topological-geometrical (intermediate) representation of the regions,
(done by :func:`skeleton2regions`), this function provides a fully geometrical description
of a region.
Parameters
----------
boundary_splines : list
Each element of the list is a `Handle_Geom_BSplineCurve` object, giving a reference to the
B-splines bounding the region. The splines must either be ordered (see
:func:`branches2boundary`) or they must appear in an order such that the n-th spline in
the list can be connected to one of the first n-1 splines in the list.
Returns
-------
splinegon : TopoDS_Face
The resulting splinegon (surface). For details on the object, see the OpenCASCADE API:
https://www.opencascade.com/doc/occt-7.4.0/refman/html/class_topo_d_s___face.html
boundary : TopoDS_Wire
The boundary of the splinegon. For details on the resulting object, see the OpenCASCADE API:
https://www.opencascade.com/doc/occt-7.4.0/refman/html/class_topo_d_s___wire.html
See Also
--------
skeleton2regions
fit_spline
Notes
-----
The syntax `Handle_classname` in PythonOCC corresponds to wrapping the object of class
`classname` with a smart pointer. In the C++ interface, it is done by a template:
`Handle<classname>`.
"""
# Combine the splines so that they form the boundary (a collection of joining splines)
boundary = BRepBuilderAPI_MakeWire()
for spline in boundary_splines:
edge = BRepBuilderAPI_MakeEdge(spline).Edge()
boundary.Add(edge)
_wire_error(boundary.Error())
# The planar surface (face) is stretched by the wire
splinegon = BRepBuilderAPI_MakeFace(boundary.Wire())
_face_error(splinegon.Error())
return splinegon.Face(), boundary.Wire()
def write_face(self, points_face, list_points_edge, topo_face, toledge):
"""
Method to recreate a Face associated to a geometric surface
after the modification of Face points. It returns a TopoDS_Face.
:param points_face: the new face points array.
:param list_points_edge: new edge points
:param topo_face: the face to be modified
:param toledge: tolerance on the surface creation after modification
:return: TopoDS_Face (Shape)
:rtype: TopoDS_Shape
"""
# convert Face to Geom B-spline Surface
nurbs_converter = BRepBuilderAPI_NurbsConvert(topo_face)
nurbs_converter.Perform(topo_face)
nurbs_face = nurbs_converter.Shape()
topo_nurbsface = topods.Face(nurbs_face)
h_geomsurface = BRep_Tool.Surface(topo_nurbsface)
h_bsurface = geomconvert_SurfaceToBSplineSurface(h_geomsurface)
bsurface = h_bsurface.GetObject()
nb_u = bsurface.NbUPoles()
nb_v = bsurface.NbVPoles()
# check consistency
if points_face.shape[0] != nb_u * nb_v:
raise ValueError("Input control points do not have not have the "
"same number as the geometric face!")
# cycle on the face points
indice_cpt = 0
for iu in range(1, nb_u + 1):
for iv in range(1, nb_v + 1):
cpt = points_face[indice_cpt]
bsurface.SetPole(iu, iv, gp_Pnt(cpt[0], cpt[1], cpt[2]))
indice_cpt += 1
# create modified new face
new_bspline_tface = BRepBuilderAPI_MakeFace()
toler = precision_Confusion()
new_bspline_tface.Init(bsurface.GetHandle(), False, toler)
# cycle on the wires
face_wires_explorer = TopExp_Explorer(
topo_nurbsface.Oriented(TopAbs_FORWARD), TopAbs_WIRE)
ind_edge_total = 0
while face_wires_explorer.More():
# get old wire
twire = topods_Wire(face_wires_explorer.Current())
# cycle on the edges
ind_edge = 0
wire_explorer_edge = TopExp_Explorer(
twire.Oriented(TopAbs_FORWARD), TopAbs_EDGE)
# check edges order on the wire
mode3d = True
tolerance_edges = toledge
wire_order = ShapeAnalysis_WireOrder(mode3d, tolerance_edges)
# an edge list
deformed_edges = []
# cycle on the edges
while wire_explorer_edge.More():
tedge = topods_Edge(wire_explorer_edge.Current())
new_bspline_tedge = self.write_edge(
list_points_edge[ind_edge_total], tedge)
deformed_edges.append(new_bspline_tedge)
analyzer = topexp()
vfirst = analyzer.FirstVertex(new_bspline_tedge)
vlast = analyzer.LastVertex(new_bspline_tedge)
pt1 = BRep_Tool.Pnt(vfirst)
pt2 = BRep_Tool.Pnt(vlast)
wire_order.Add(pt1.XYZ(), pt2.XYZ())
ind_edge += 1
ind_edge_total += 1
wire_explorer_edge.Next()
# grouping the edges in a wire, then in the face
# check edges order and connectivity within the wire
wire_order.Perform()
# new wire to be created
stol = ShapeFix_ShapeTolerance()
new_bspline_twire = BRepBuilderAPI_MakeWire()
for order_i in range(1, wire_order.NbEdges() + 1):
deformed_edge_i = wire_order.Ordered(order_i)
if deformed_edge_i > 0:
# insert the deformed edge to the new wire
new_edge_toadd = deformed_edges[deformed_edge_i - 1]
stol.SetTolerance(new_edge_toadd, toledge)
new_bspline_twire.Add(new_edge_toadd)
if new_bspline_twire.Error() != 0:
stol.SetTolerance(new_edge_toadd, toledge * 10.0)
new_bspline_twire.Add(new_edge_toadd)
else:
deformed_edge_revers = deformed_edges[
np.abs(deformed_edge_i) - 1]
stol.SetTolerance(deformed_edge_revers, toledge)
new_bspline_twire.Add(deformed_edge_revers)
if new_bspline_twire.Error() != 0:
stol.SetTolerance(deformed_edge_revers, toledge * 10.0)
new_bspline_twire.Add(deformed_edge_revers)
# add new wire to the Face
new_bspline_tface.Add(new_bspline_twire.Wire())
face_wires_explorer.Next()
return topods.Face(new_bspline_tface.Face())
def arrange_edges_2_wires(occedgelist, isclosed=False):
from OCC.TopoDS import topods
from OCC.TopExp import topexp
from OCC.BRep import BRep_Tool
from OCC.ShapeAnalysis import ShapeAnalysis_WireOrder
from OCC.Precision import precision
from OCC.BRepBuilderAPI import BRepBuilderAPI_WireDone, BRepBuilderAPI_EmptyWire, BRepBuilderAPI_DisconnectedWire, BRepBuilderAPI_NonManifoldWire
wb_errdict = {
BRepBuilderAPI_WireDone: "No error",
BRepBuilderAPI_EmptyWire: "Empty wire",
BRepBuilderAPI_DisconnectedWire: "disconnected wire",
BRepBuilderAPI_NonManifoldWire: "non-manifold wire"
}
sawo_statusdict = {
0: "all edges are direct and in sequence",
1: "all edges are direct but some are not in sequence",
2: "unresolved gaps remain",
-1: "some edges are reversed, but no gaps remain",
-2: "some edges are reversed and some gaps remain",
-10: "failure on reorder"
}
mode3d = True
SAWO = ShapeAnalysis_WireOrder(mode3d, precision.PConfusion())
for edge in occedgelist:
V1 = topexp.FirstVertex(topods.Edge(edge))
V2 = topexp.LastVertex(topods.Edge(edge))
pnt1 = BRep_Tool().Pnt(V1)
pnt2 = BRep_Tool().Pnt(V2)
SAWO.Add(pnt1.XYZ(), pnt2.XYZ())
SAWO.SetKeepLoopsMode(True)
SAWO.Perform(isclosed)
#print "SAWO.Status()", SAWO.Status()
if not SAWO.IsDone():
raise RuntimeError, "build wire: Unable to reorder edges: \n" + sawo_statusdict[
SAWO.Status()]
else:
if SAWO.Status() not in [0, -1]:
pass # not critical, wirebuilder will handle this
SAWO.SetChains(precision.PConfusion())
wirelist = []
#print "Number of chains: ", SAWO.NbChains()
for i in range(SAWO.NbChains()):
wirebuilder = BRepBuilderAPI_MakeWire()
estart, eend = SAWO.Chain(i + 1)
#print "Number of edges in chain", i, ": ", eend - estart + 1
if (eend - estart + 1) == 0:
continue
for j in range(estart, eend + 1):
idx = abs(
SAWO.Ordered(j)
) # wirebuilder = s_addToWireBuilder(wirebuilder, edgelist[idx-1])
edge2w = occedgelist[idx - 1]
wirebuilder.Add(edge2w)
if wirebuilder is None:
raise RuntimeError, " build wire: Error adding edge number " + str(
j + 1) + " to Wire number " + str(i)
err = wirebuilder.Error()
if err != BRepBuilderAPI_WireDone:
raise RuntimeError, "Overlay2D: build wire: Error adding edge number " + str(
j + 1) + " to Wire number " + str(
i) + ": \n" + wb_errdict[err]
try:
wirebuilder.Build()
aWire = wirebuilder.Wire()
wirelist.append(aWire)
except Exception, err:
raise RuntimeError, "Overlay2D: build wire: Creation of Wire number " + str(
i) + " from edge(s) failed. \n" + str(err)
wirebuilder.Build()
aWire = wirebuilder.Wire()
wirelist.append(aWire)
