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TopologyUtils.py
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TopologyUtils.py
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#!/usr/bin/env python
##Copyright 2008-2015 Jelle Feringa ([email protected])
##
##This file is part of pythonOCC.
##
##pythonOCC is free software: you can redistribute it and/or modify
##it under the terms of the GNU Lesser General Public License as published by
##the Free Software Foundation, either version 3 of the License, or
##(at your option) any later version.
##
##pythonOCC is distributed in the hope that it will be useful,
##but WITHOUT ANY WARRANTY; without even the implied warranty of
##MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
##GNU Lesser General Public License for more details.
##
##You should have received a copy of the GNU Lesser General Public License
##along with pythonOCC. If not, see <http://www.gnu.org/licenses/>.
from OCC.Core.BRep import BRep_Tool
from OCC.Core.BRepTools import BRepTools_WireExplorer
from OCC.Core.TopAbs import (TopAbs_VERTEX, TopAbs_EDGE, TopAbs_FACE, TopAbs_WIRE,
TopAbs_SHELL, TopAbs_SOLID, TopAbs_COMPOUND,
TopAbs_COMPSOLID)
from OCC.Core.TopExp import TopExp_Explorer, topexp_MapShapesAndAncestors
from OCC.Core.TopTools import (TopTools_ListIteratorOfListOfShape,
TopTools_IndexedDataMapOfShapeListOfShape)
from OCC.Core.TopoDS import (topods, TopoDS_Wire, TopoDS_Vertex, TopoDS_Edge,
TopoDS_Face, TopoDS_Shell, TopoDS_Solid,
TopoDS_Compound, TopoDS_CompSolid, topods_Edge,
topods_Vertex, TopoDS_Iterator)
from OCC.Core.GCPnts import GCPnts_UniformAbscissa
from OCC.Core.BRepAdaptor import BRepAdaptor_Curve
class WireExplorer:
'''
Wire traversal
'''
def __init__(self, wire):
assert isinstance(wire, TopoDS_Wire), 'not a TopoDS_Wire'
self.wire = wire
self.wire_explorer = BRepTools_WireExplorer(self.wire)
self.done = False
def _reinitialize(self):
self.wire_explorer = BRepTools_WireExplorer(self.wire)
self.done = False
def _loop_topo(self, edges=True):
if self.done:
self._reinitialize()
topologyType = topods_Edge if edges else topods_Vertex
seq = []
occ_seq = []
while self.wire_explorer.More():
# loop edges
if edges:
current_item = self.wire_explorer.Current()
# loop vertices
else:
current_item = self.wire_explorer.CurrentVertex()
occ_seq.append(current_item)
self.wire_explorer.Next()
# Convert occ_seq to python list
for elem in occ_seq:
topo_to_add = topologyType(elem)
seq.append(topo_to_add)
self.done = True
return iter(seq)
def ordered_edges(self):
return self._loop_topo(edges=True)
def ordered_vertices(self):
return self._loop_topo(edges=False)
class TopologyExplorer:
'''
Topology traversal
'''
def __init__(self, myShape, ignore_orientation=True):
"""
implements topology traversal from any TopoDS_Shape
this class lets you find how various topological entities are connected from one to another
find the faces connected to an edge, find the vertices this edge is made from, get all faces connected to
a vertex, and find out how many topological elements are connected from a source
*note* when traversing TopoDS_Wire entities, its advised to use the specialized
``WireExplorer`` class, which will return the vertices / edges in the expected order
:param myShape: the shape which topology will be traversed
:param ignore_orientation: filter out TopoDS_* entities of similar TShape but different Orientation
for instance, a cube has 24 edges, 4 edges for each of 6 faces
that results in 48 vertices, while there are only 8 vertices that have a unique
geometric coordinate
in certain cases ( computing a graph from the topology ) its preferable to return
topological entities that share similar geometry, though differ in orientation
by setting the ``ignore_orientation`` variable
to True, in case of a cube, just 12 edges and only 8 vertices will be returned
for further reference see TopoDS_Shape IsEqual / IsSame methods
"""
self.myShape = myShape
self.ignore_orientation = ignore_orientation
# the topoFactory dicts maps topology types and functions that can
# create this topology
self.topoFactory = {
TopAbs_VERTEX: topods.Vertex,
TopAbs_EDGE: topods.Edge,
TopAbs_FACE: topods.Face,
TopAbs_WIRE: topods.Wire,
TopAbs_SHELL: topods.Shell,
TopAbs_SOLID: topods.Solid,
TopAbs_COMPOUND: topods.Compound,
TopAbs_COMPSOLID: topods.CompSolid
}
self.topExp = TopExp_Explorer()
def _loop_topo(self, topologyType, topologicalEntity=None, topologyTypeToAvoid=None):
'''
this could be a faces generator for a python TopoShape class
that way you can just do:
for face in srf.faces:
processFace(face)
'''
topoTypes = {TopAbs_VERTEX: TopoDS_Vertex,
TopAbs_EDGE: TopoDS_Edge,
TopAbs_FACE: TopoDS_Face,
TopAbs_WIRE: TopoDS_Wire,
TopAbs_SHELL: TopoDS_Shell,
TopAbs_SOLID: TopoDS_Solid,
TopAbs_COMPOUND: TopoDS_Compound,
TopAbs_COMPSOLID: TopoDS_CompSolid}
assert topologyType in topoTypes.keys(), '%s not one of %s' % (topologyType, topoTypes.keys())
# use self.myShape if nothing is specified
if topologicalEntity is None and topologyTypeToAvoid is None:
self.topExp.Init(self.myShape, topologyType)
elif topologicalEntity is None and topologyTypeToAvoid is not None:
self.topExp.Init(self.myShape, topologyType, topologyTypeToAvoid)
elif topologyTypeToAvoid is None:
self.topExp.Init(topologicalEntity, topologyType)
elif topologyTypeToAvoid:
self.topExp.Init(topologicalEntity,
topologyType,
topologyTypeToAvoid)
seq = []
while self.topExp.More():
current_item = self.topExp.Current()
topo_to_add = self.topoFactory[topologyType](current_item)
seq.append(topo_to_add)
self.topExp.Next()
if self.ignore_orientation:
# filter out those entities that share the same TShape
# but do *not* share the same orientation
filter_orientation_seq = []
for i in seq:
_present = False
for j in filter_orientation_seq:
if i.IsSame(j):
_present = True
break
if _present is False:
filter_orientation_seq.append(i)
return iter(filter_orientation_seq)
else:
return iter(seq)
def faces(self):
'''
loops over all faces
'''
return self._loop_topo(TopAbs_FACE)
def _number_of_topo(self, iterable):
n = 0
for i in iterable:
n += 1
return n
def number_of_faces(self):
return self._number_of_topo(self.faces())
def vertices(self):
'''
loops over all vertices
'''
return self._loop_topo(TopAbs_VERTEX)
def number_of_vertices(self):
return self._number_of_topo(self.vertices())
def edges(self):
'''
loops over all edges
'''
return self._loop_topo(TopAbs_EDGE)
def number_of_edges(self):
return self._number_of_topo(self.edges())
def wires(self):
'''
loops over all wires
'''
return self._loop_topo(TopAbs_WIRE)
def number_of_wires(self):
return self._number_of_topo(self.wires())
def shells(self):
'''
loops over all shells
'''
return self._loop_topo(TopAbs_SHELL, None)
def number_of_shells(self):
return self._number_of_topo(self.shells())
def solids(self):
'''
loops over all solids
'''
return self._loop_topo(TopAbs_SOLID, None)
def number_of_solids(self):
return self._number_of_topo(self.solids())
def comp_solids(self):
'''
loops over all compound solids
'''
return self._loop_topo(TopAbs_COMPSOLID)
def number_of_comp_solids(self):
return self._number_of_topo(self.comp_solids())
def compounds(self):
'''
loops over all compounds
'''
return self._loop_topo(TopAbs_COMPOUND)
def number_of_compounds(self):
return self._number_of_topo(self.compounds())
def ordered_vertices_from_wire(self, wire):
'''
@param wire: TopoDS_Wire
'''
we = WireExplorer(wire)
return we.ordered_vertices()
def number_of_ordered_vertices_from_wire(self, wire):
return self._number_of_topo(self.ordered_vertices_from_wire(wire))
def ordered_edges_from_wire(self, wire):
'''
@param wire: TopoDS_Wire
'''
we = WireExplorer(wire)
return we.ordered_edges()
def number_of_ordered_edges_from_wire(self, wire):
return self._number_of_topo(self.ordered_edges_from_wire(wire))
def _map_shapes_and_ancestors(self, topoTypeA, topoTypeB, topologicalEntity):
'''
using the same method
@param topoTypeA:
@param topoTypeB:
@param topologicalEntity:
'''
topo_set = set()
_map = TopTools_IndexedDataMapOfShapeListOfShape()
topexp_MapShapesAndAncestors(self.myShape, topoTypeA, topoTypeB, _map)
results = _map.FindFromKey(topologicalEntity)
if results.Size() == 0:
yield None
topology_iterator = TopTools_ListIteratorOfListOfShape(results)
while topology_iterator.More():
topo_entity = self.topoFactory[topoTypeB](topology_iterator.Value())
# return the entity if not in set
# to assure we're not returning entities several times
if not topo_entity in topo_set:
if self.ignore_orientation:
unique = True
for i in topo_set:
if i.IsSame(topo_entity):
unique = False
break
if unique:
yield topo_entity
else:
yield topo_entity
topo_set.add(topo_entity)
topology_iterator.Next()
def _number_shapes_ancestors(self, topoTypeA, topoTypeB, topologicalEntity):
'''returns the number of shape ancestors
If you want to know how many edges a faces has:
_number_shapes_ancestors(self, TopAbs_EDGE, TopAbs_FACE, edg)
will return the number of edges a faces has
@param topoTypeA:
@param topoTypeB:
@param topologicalEntity:
'''
topo_set = set()
_map = TopTools_IndexedDataMapOfShapeListOfShape()
topexp_MapShapesAndAncestors(self.myShape, topoTypeA, topoTypeB, _map)
results = _map.FindFromKey(topologicalEntity)
if results.Size() == 0:
return None
topology_iterator = TopTools_ListIteratorOfListOfShape(results)
while topology_iterator.More():
topo_set.add(topology_iterator.Value())
topology_iterator.Next()
return len(topo_set)
# ======================================================================
# EDGE <-> FACE
# ======================================================================
def faces_from_edge(self, edge):
"""
:param edge:
:return:
"""
return self._map_shapes_and_ancestors(TopAbs_EDGE, TopAbs_FACE, edge)
def number_of_faces_from_edge(self, edge):
"""
:param edge:
:return:
"""
return self._number_shapes_ancestors(TopAbs_EDGE, TopAbs_FACE, edge)
def edges_from_face(self, face):
"""
:param face:
:return:
"""
return self._loop_topo(TopAbs_EDGE, face)
def number_of_edges_from_face(self, face):
cnt = 0
for i in self._loop_topo(TopAbs_EDGE, face):
cnt += 1
return cnt
# ======================================================================
# VERTEX <-> EDGE
# ======================================================================
def vertices_from_edge(self, edg):
return self._loop_topo(TopAbs_VERTEX, edg)
def number_of_vertices_from_edge(self, edg):
cnt = 0
for i in self._loop_topo(TopAbs_VERTEX, edg):
cnt += 1
return cnt
def edges_from_vertex(self, vertex):
return self._map_shapes_and_ancestors(TopAbs_VERTEX, TopAbs_EDGE, vertex)
def number_of_edges_from_vertex(self, vertex):
return self._number_shapes_ancestors(TopAbs_VERTEX, TopAbs_EDGE, vertex)
# ======================================================================
# WIRE <-> EDGE
# ======================================================================
def edges_from_wire(self, wire):
return self._loop_topo(TopAbs_EDGE, wire)
def number_of_edges_from_wire(self, wire):
cnt = 0
for i in self._loop_topo(TopAbs_EDGE, wire):
cnt += 1
return cnt
def wires_from_edge(self, edg):
return self._map_shapes_and_ancestors(TopAbs_EDGE, TopAbs_WIRE, edg)
def wires_from_vertex(self, edg):
return self._map_shapes_and_ancestors(TopAbs_VERTEX, TopAbs_WIRE, edg)
def number_of_wires_from_edge(self, edg):
return self._number_shapes_ancestors(TopAbs_EDGE, TopAbs_WIRE, edg)
# ======================================================================
# WIRE <-> FACE
# ======================================================================
def wires_from_face(self, face):
return self._loop_topo(TopAbs_WIRE, face)
def number_of_wires_from_face(self, face):
cnt = 0
for i in self._loop_topo(TopAbs_WIRE, face):
cnt += 1
return cnt
def faces_from_wire(self, wire):
return self._map_shapes_and_ancestors(TopAbs_WIRE, TopAbs_FACE, wire)
def number_of_faces_from_wires(self, wire):
return self._number_shapes_ancestors(TopAbs_WIRE, TopAbs_FACE, wire)
# ======================================================================
# VERTEX <-> FACE
# ======================================================================
def faces_from_vertex(self, vertex):
return self._map_shapes_and_ancestors(TopAbs_VERTEX, TopAbs_FACE, vertex)
def number_of_faces_from_vertex(self, vertex):
return self._number_shapes_ancestors(TopAbs_VERTEX, TopAbs_FACE, vertex)
def vertices_from_face(self, face):
return self._loop_topo(TopAbs_VERTEX, face)
def number_of_vertices_from_face(self, face):
cnt = 0
for i in self._loop_topo(TopAbs_VERTEX, face):
cnt += 1
return cnt
# ======================================================================
# FACE <-> SOLID
# ======================================================================
def solids_from_face(self, face):
return self._map_shapes_and_ancestors(TopAbs_FACE, TopAbs_SOLID, face)
def number_of_solids_from_face(self, face):
return self._number_shapes_ancestors(TopAbs_FACE, TopAbs_SOLID, face)
def faces_from_solids(self, solid):
return self._loop_topo(TopAbs_FACE, solid)
def number_of_faces_from_solids(self, solid):
cnt = 0
for i in self._loop_topo(TopAbs_FACE, solid):
cnt += 1
return cnt
def dump_topology_to_string(shape, level=0, buffer=""):
"""
Return the details of an object from the top down
"""
brt = BRep_Tool()
s = shape.ShapeType()
if s == TopAbs_VERTEX:
pnt = brt.Pnt(topods_Vertex(shape))
print(".." * level + "<Vertex %i: %s %s %s>\n" % (hash(shape), pnt.X(), pnt.Y(), pnt.Z()))
else:
print(".." * level, end="")
print(shape)
it = TopoDS_Iterator(shape)
while it.More() and level < 5: # LEVEL MAX
shp = it.Value()
it.Next()
dump_topology_to_string(shp, level + 1, buffer)
#
# Edge and wire discretizers
#
def discretize_wire(a_topods_wire):
""" Returns a set of points
"""
if not is_wire(a_topods_wire):
raise AssertionError("You must provide a TopoDS_Wire to the discretize_wire function.")
wire_explorer = WireExplorer(a_topods_wire)
wire_pnts = []
# loop over ordered edges
for edg in wire_explorer.ordered_edges():
edg_pnts = discretize_edge(edg)
wire_pnts += edg_pnts
return wire_pnts
def discretize_edge(a_topods_edge, deflection=0.5):
""" Take a TopoDS_Edge and returns a list of points
The more deflection is small, the more the discretization is precise,
i.e. the more points you get in the returned points
"""
if not is_edge(a_topods_edge):
raise AssertionError("You must provide a TopoDS_Edge to the discretize_edge function.")
if a_topods_edge.IsNull():
print("Warning : TopoDS_Edge is null. discretize_edge will return an empty list of points.")
return []
curve_adaptator = BRepAdaptor_Curve(a_topods_edge)
first = curve_adaptator.FirstParameter()
last = curve_adaptator.LastParameter()
discretizer = GCPnts_UniformAbscissa()
discretizer.Initialize(curve_adaptator, deflection, first, last)
if not discretizer.IsDone():
raise AssertionError("Discretizer not done.")
if not discretizer.NbPoints() > 0:
raise AssertionError("Discretizer nb points not > 0.")
points = []
for i in range(1, discretizer.NbPoints() + 1):
p = curve_adaptator.Value(discretizer.Parameter(i))
points.append(p.Coord())
return points
#
# TopoDS_Shape type utils
#
def is_vertex(topods_shape):
return topods_shape.ShapeType() == TopAbs_VERTEX
def is_solid(topods_shape):
return topods_shape.ShapeType() == TopAbs_SOLID
def is_edge(topods_shape):
return topods_shape.ShapeType() == TopAbs_EDGE
def is_face(topods_shape):
return topods_shape.ShapeType() == TopAbs_FACE
def is_shell(topods_shape):
return topods_shape.ShapeType() == TopAbs_SHELL
def is_wire(topods_shape):
return topods_shape.ShapeType() == TopAbs_WIRE
def is_compound(topods_shape):
return topods_shape.ShapeType() == TopAbs_COMPOUND
def is_compsolid(topods_shape):
return topods_shape.ShapeType() == TopAbs_COMPSOLID
def get_type_as_string(topods_shape):
""" just get the type string, remove TopAbs_ and lowercas all ending letters
"""
types = {TopAbs_VERTEX: "Vertex", TopAbs_COMPSOLID: "CompSolid", TopAbs_FACE: "Face",
TopAbs_WIRE: "Wire", TopAbs_EDGE: "Edge", TopAbs_COMPOUND: "Compound",
TopAbs_COMPSOLID: "CompSolid", TopAbs_SOLID: "Solid"}
return types[topods_shape.ShapeType()]