def __init__(self, shape):
if not shape.IsNull():
if not shape.ShapeType() == Shape.EDGE:
raise TypeError('Shape is not a TopoDS_Edge.')
if not isinstance(shape, TopoDS_Edge):
shape = TopoDS.Edge_(shape)
super(Edge, self).__init__(shape)
def __init__(self, wire, face=None):
if face is None:
explorer = BRepTools_WireExplorer(wire)
else:
explorer = BRepTools_WireExplorer(wire, face)
edges = []
current_verts = []
while explorer.More():
ei = TopoDS.Edge_(explorer.Current())
vi = TopoDS.Vertex_(explorer.CurrentVertex())
edges.append(ei)
current_verts.append(vi)
explorer.Next()
# CurrentVertex doesn't get the last vertex. Try to get it.
ordered_verts = list(current_verts)
if edges:
data = ShapeExtend_WireData(wire)
fix = ShapeFix_WireSegment(data)
v1 = fix.LastVertex()
ordered_verts.append(v1)
self._edges = edges
self._current_verts = current_verts
self._ordered_verts = ordered_verts
def get_edges(shape, unique=True):
"""
Get edges from a shape.
:param OCCT.TopoDS.TopoDS_Shape shape: The shape.
:param bool unique: Option to return only unique edges.
:return: Edges of shape.
:rtype: list[OCCT.TopoDS.TopoDS_Edge]
"""
if isinstance(shape, TopoDS_Edge):
return [shape]
exp = TopExp_Explorer(shape, TopAbs_EDGE)
edges = []
while exp.More():
ei = exp.Current()
edge = TopoDS.Edge_(ei)
if unique:
is_unique = True
for e in edges:
if e.IsSame(edge):
is_unique = False
break
if is_unique:
edges.append(edge)
else:
edges.append(edge)
exp.Next()
return edges
def curve_of_wire(wire):
"""
Get the curve of the wire. The edges are concatenated so the
resulting curve may be C0 continuous.
:param OCCT.TopoDS.TopoDS_Wire wire: The wire.
:return: Concatenated curve of wire.
:rtype: OCCT.Geom.Geom_BSplineCurve
:raise RuntimeError: If an unsupported curve type is found.
"""
geom_convert = GeomConvert_CompCurveToBSplineCurve()
exp = BRepTools_WireExplorer(wire)
tol = ExploreShape.global_tolerance(wire, 1)
while exp.More():
e = TopoDS.Edge_(exp.Current())
exp.Next()
adp_crv = BRepAdaptor_Curve(e)
geom_convert.Add(adp_crv.BSpline(), tol)
crv = geom_convert.BSplineCurve()
if not isinstance(crv, Geom_BSplineCurve):
msg = 'Unsupported curve type.'
raise RuntimeError(msg)
return crv
def is_line(cls, shape):
""" Check if an edge or wire is a line.
This can be used to see if an edge can be used for length dimensions.
Returns
-------
bool: Bool
Whether the shape is a part of a line
"""
edge = TopoDS.Edge_(shape)
curve = BRepAdaptor_Curve(edge)
return curve.GetType() == GeomAbs.GeomAbs_Line
def curve(self):
"""
:return: The curve formed by concatenating all the underlying curves
of the edges.
:rtype: afem.geometry.entities.NurbsCurve
"""
geom_convert = GeomConvert_CompCurveToBSplineCurve()
exp = BRepTools_WireExplorer(self.object)
tol = self.tol_max
while exp.More():
e = TopoDS.Edge_(exp.Current())
exp.Next()
adp_crv = BRepAdaptor_Curve(e)
geom_convert.Add(adp_crv.BSpline(), tol)
geom_curve = geom_convert.BSplineCurve()
return Curve.wrap(geom_curve)
def to_edge(cls, entity):
"""
Convert an entity to an edge.
:param entity: The entity.
:return: An edge.
:rtype: OCCT.TopoDS.TopoDS_Edge
:raise TypeError: If entity cannot be converted to an edge.
"""
if isinstance(entity, TopoDS_Edge):
return entity
if cls.is_shape(entity) and entity.ShapeType() == TopAbs_EDGE:
return TopoDS.Edge_(entity)
raise TypeError('Failed to convert entity to an edge.')
def cast_curve(cls, shape, expected_type=None):
""" Attempt to cast the shape (an edge or wire) to a curve
Parameters
----------
shape: TopoDS_Edge
The shape to cast
expected_type: GeomAbs_CurveType
The type to restrict
Returns
-------
curve: Curve or None
The curve or None if it could not be created or if it was not
of the expected type (if given).
"""
edge = TopoDS.Edge_(shape)
curve = BRepAdaptor_Curve(edge)
return cls.curve_factory[curve.GetType()](curve)
def to_shape(cls, entity):
"""
Convert the entity to a shape. This method tries to convert the
entity to its most specific shape type.
:param entity: The entity.
:return: A shape.
:rtype: OCCT.TopoDS.TopoDS_Shape
:raise TypeError: If entity cannot be converted to a shape.
"""
if entity is None:
return None
# Shapes
if isinstance(entity, TopoDS_Shape):
if entity.IsNull():
raise TypeError('Cannot convert null shape.')
elif entity.ShapeType() == TopAbs_VERTEX:
return TopoDS.Vertex_(entity)
elif entity.ShapeType() == TopAbs_EDGE:
return TopoDS.Edge_(entity)
elif entity.ShapeType() == TopAbs_WIRE:
return TopoDS.Wire_(entity)
elif entity.ShapeType() == TopAbs_FACE:
return TopoDS.Face_(entity)
elif entity.ShapeType() == TopAbs_SHELL:
return TopoDS.Shell_(entity)
elif entity.ShapeType() == TopAbs_SOLID:
return TopoDS.Solid_(entity)
elif entity.ShapeType() == TopAbs_COMPSOLID:
return TopoDS.CompSolid_(entity)
elif entity.ShapeType() == TopAbs_COMPOUND:
return TopoDS.Compound_(entity)
else:
raise TypeError('Failed to convert entity to a shape.')
raise TypeError('Failed to convert entity to a shape.')
