def offset_cube(event=None):
S2 = BRepPrimAPI_MakeBox(gp_Pnt(300, 0, 0), 220, 140, 180).Shape()
offsetB = BRepOffsetAPI_MakeOffsetShape(S2, -20, 0.01, BRepOffset_Skin, False, False, GeomAbs_Arc)
offB = display.DisplayColoredShape(S2, 'BLUE')
display.Context.SetTransparency(offB, 0.3, True)
display.DisplayColoredShape(offsetB.Shape(), 'GREEN')
display.FitAll()
class OffsetShape(object):
"""
Offset a shape.
:param afem.topology.entities.Shape shape: The shape. It may be a face,
shell, a solid, or a compound of these kinds.
:param float offset: The offset value. The offset will be outside the
shape if positive and inside if negative.
:param float tol: Tolerance for coincidence for generated shapes. If not
provided the average tolerance of the shape is used.
:param OCC.Core.GeomAbs.GeomAbs_JoinType join_mode: Option for how to fill
holes that may appear when offsetting two adjacent faces.
:param bool remove_internal_edges: Option to remove internal edges from the
result.
:param bool perform_simple: Option to use simple algorithm without
intersection computation.
"""
def __init__(self,
shape,
offset,
tol=None,
join_mode=Geometry.ARC,
remove_internal_edges=False,
perform_simple=False):
if tol is None:
tol = shape.tol_avg
self._tool = BRepOffsetAPI_MakeOffsetShape()
if perform_simple:
self._tool.PerformBySimple(shape.object, offset)
else:
self._tool.PerformByJoin(shape.object, offset, tol,
BRepOffset_Skin, False, False, join_mode,
remove_internal_edges)
self._shape = Shape.wrap(self._tool.Shape())
@property
def is_done(self):
"""
:return: *True* if done, *False* if not.
:rtype: bool
"""
return self._tool.IsDone()
@property
def shape(self):
"""
:return: The offset shape.
:rtype: afem.topology.entities.Shape
"""
return self._shape
def __init__(self,
shape,
offset,
tol=None,
join_mode=Geometry.ARC,
remove_internal_edges=False,
perform_simple=False):
if tol is None:
tol = shape.tol_avg
self._tool = BRepOffsetAPI_MakeOffsetShape()
if perform_simple:
self._tool.PerformBySimple(shape.object, offset)
else:
self._tool.PerformByJoin(shape.object, offset, tol,
BRepOffset_Skin, False, False, join_mode,
remove_internal_edges)
self._shape = Shape.wrap(self._tool.Shape())
def make_offset_shape(shapeToOffset, offsetDistance, tolerance=TOLERANCE,
offsetMode=BRepOffset_Skin, intersection=False,
selfintersection=False, joinType=GeomAbs_Arc):
'''
builds an offsetted shell from a shape
construct an offsetted version of the shape
'''
from OCC.Core.BRepOffsetAPI import BRepOffsetAPI_MakeOffsetShape
try:
offset = BRepOffsetAPI_MakeOffsetShape(shapeToOffset,
offsetDistance,
tolerance,
offsetMode,
intersection,
selfintersection,
joinType)
if offset.IsDone():
return offset.Shape()
else:
return None
except RuntimeError('failed to offset shape'):
return None
def _offset(shp, off):
algo = BRepOffsetAPI_MakeOffsetShape()
algo.PerformByJoin(shp.Shape(), off, 1e-6)
algo.Build()
return Shape(algo.Shape())