def get_boundingbox(shape, tol=1e-6, optimal_BB=True):
""" return the bounding box of the TopoDS_Shape `shape`
Parameters
----------
shape : TopoDS_Shape or a subclass such as TopoDS_Face
the shape to compute the bounding box from
tol: float
tolerance of the computed boundingbox
use_triangulation : bool, True by default
This makes the computation more accurate
Returns
-------
if `as_pnt` is True, return a tuple of gp_Pnt instances
for the lower and another for the upper X,Y,Z values representing the bounding box
if `as_pnt` is False, return a tuple of lower and then upper X,Y,Z values
representing the bounding box
"""
bbox = Bnd_Box()
bbox.SetGap(tol)
# note: useTriangulation is True by default, we set it explicitely, but t's not necessary
if optimal_BB:
use_triangulation = True
use_shapetolerance = True
brepbndlib_AddOptimal(shape, bbox, use_triangulation,
use_shapetolerance)
else:
brepbndlib_Add(shape, bbox)
xmin, ymin, zmin, xmax, ymax, zmax = bbox.Get()
corner1 = gp_Pnt(xmin, ymin, zmin)
corner2 = gp_Pnt(xmax, ymax, zmax)
center = midpoint(corner1, corner2)
dx = xmax - xmin
dy = ymax - ymin
dz = zmax - zmin
box_shp = BRepPrimAPI_MakeBox(corner1, corner2).Shape()
return xmin, ymin, zmin, xmax, ymax, zmax
def test_midpoint(self):
p1 = gp_Pnt(0, 0, 0)
p2 = gp_Pnt(4, 5, 6)
p3 = midpoint(p1, p2)
self.assertEqual([p3.X(), p3.Y(), p3.Z()], [2, 2.5, 3.0])
def get_aligned_boundingbox_ratio(shape, tol=1e-6, optimal_BB=True, ratio=1):
""" return the bounding box of the TopoDS_Shape `shape`
Parameters
----------
shape : TopoDS_Shape or a subclass such as TopoDS_Face
the shape to compute the bounding box from
tol: float
tolerance of the computed boundingbox
use_triangulation : bool, True by default
This makes the computation more accurate
ratio : float, 1.0 by default.
Returns
-------
if `as_pnt` is True, return a tuple of gp_Pnt instances
for the lower and another for the upper X,Y,Z values representing the bounding box
if `as_pnt` is False, return a tuple of lower and then upper X,Y,Z values
representing the bounding box
"""
bbox = Bnd_Box()
bbox.SetGap(tol)
# note: useTriangulation is True by default, we set it explicitely, but t's not necessary
if optimal_BB:
use_triangulation = True
use_shapetolerance = True
brepbndlib_AddOptimal(shape, bbox, use_triangulation,
use_shapetolerance)
else:
brepbndlib_Add(shape, bbox)
xmin, ymin, zmin, xmax, ymax, zmax = bbox.Get()
dx, mx = (xmax - xmin) * ratio, (xmax + xmin) / 2
dy, my = (ymax - ymin) * ratio, (ymax + ymin) / 2
dz, mz = (zmax - zmin) * ratio, (zmax + zmin) / 2
x0, x1 = mx - dx / 2, mx + dx / 2
y0, y1 = my - dy / 2, my + dy / 2
z0, z1 = mz - dz / 2, mz + dz / 2
corner1 = gp_Pnt(x0, y0, z0)
corner2 = gp_Pnt(x1, y1, z1)
center = midpoint(corner1, corner2)
rim0 = make_polygon([
gp_Pnt(x0, y0, z0),
gp_Pnt(x1, y0, z0),
gp_Pnt(x1, y1, z0),
gp_Pnt(x0, y1, z0)
],
closed=True)
rim1 = make_polygon([
gp_Pnt(x0, y0, z1),
gp_Pnt(x1, y0, z1),
gp_Pnt(x1, y1, z1),
gp_Pnt(x0, y1, z1)
],
closed=True)
api = BRepOffsetAPI_ThruSections(True, False, 1.0E-9)
api.AddWire(rim0)
api.AddWire(rim1)
box_shp = api.Shape()
#box_shp = BRepPrimAPI_MakeBox(corner1, corner2).Shape()
return center, [dx, dy, dz], box_shp