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# ***************************************************************************
# * Copyright (c) 2009, 2010 Yorik van Havre <yorik@uncreated.net> *
# * Copyright (c) 2009, 2010 Ken Cline <cline@frii.com> *
# * Copyright (c) 2020 FreeCAD Developers *
# * *
# * This program is free software; you can redistribute it and/or modify *
# * it under the terms of the GNU Lesser General Public License (LGPL) *
# * as published by the Free Software Foundation; either version 2 of *
# * the License, or (at your option) any later version. *
# * for detail see the LICENCE text file. *
# * *
# * This program 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 Library General Public License for more details. *
# * *
# * You should have received a copy of the GNU Library General Public *
# * License along with this program; if not, write to the Free Software *
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
# * USA *
# * *
# ***************************************************************************
"""Provides functions to create offsets of different shapes."""
## @package offset
# \ingroup draftfunctions
# \brief Provides functions to create offsets of different shapes.
## \addtogroup draftfunctions
# @{
import math
import FreeCAD as App
import DraftVecUtils
from draftutils import gui_utils
from draftutils import params
from draftutils import utils
from draftmake.make_rectangle import make_rectangle
from draftmake.make_wire import make_wire
from draftmake.make_polygon import make_polygon
from draftmake.make_circle import make_circle
from draftmake.make_bspline import make_bspline
def offset(obj, delta, copy=False, bind=False, sym=False, occ=False):
"""offset(object,delta,[copymode],[bind])
Offset the given wire by applying the given delta Vector to its first
vertex.
Parameters
----------
obj :
delta : Base.Vector or list of Base.Vector
If offsetting a BSpline, the delta must not be a Vector but a list
of Vectors, one for each node of the spline.
copy : bool
If copymode is True, another object is created, otherwise the same
object gets offsetted.
copy : bool
If bind is True, and provided the wire is open, the original
and the offset wires will be bound by their endpoints, forming a face.
sym : bool
if sym is True, bind must be true too, and the offset is made on both
sides, the total width being the given delta length.
"""
import Part
import DraftGeomUtils
newwire = None
delete = None
if copy is False and (
utils.get_type(obj).startswith("Sketcher::")
or utils.get_type(obj).startswith("Part::")
or utils.get_type(obj).startswith("PartDesign::")
): # For PartDesign_SubShapeBinders which can reference sketches.
print(
"the offset tool is currently unable to offset a non-Draft object directly - Creating a copy"
)
copy = True
def getRect(p, obj):
"""returns length,height,placement"""
pl = obj.Placement.copy()
pl.Base = p[0]
diag = p[2].sub(p[0])
bb = p[1].sub(p[0])
bh = p[3].sub(p[0])
nb = DraftVecUtils.project(diag, bb)
nh = DraftVecUtils.project(diag, bh)
if obj.Length.Value < 0:
l = -nb.Length
else:
l = nb.Length
if obj.Height.Value < 0:
h = -nh.Length
else:
h = nh.Length
return l, h, pl
def getRadius(obj, delta):
"""returns a new radius for a regular polygon"""
an = math.pi / obj.FacesNumber
nr = DraftVecUtils.rotate(delta, -an)
nr.multiply(1 / math.cos(an))
nr = obj.Shape.Vertexes[0].Point.add(nr)
nr = nr.sub(obj.Placement.Base)
nr = nr.Length
if obj.DrawMode == "inscribed":
return nr
else:
return nr * math.cos(math.pi / obj.FacesNumber)
newwire = None
if utils.get_type(obj) == "Circle":
pass
elif utils.get_type(obj) == "BSpline":
pass
else:
if sym:
d1 = App.Vector(delta).multiply(0.5)
d2 = d1.negative()
n1 = DraftGeomUtils.offsetWire(obj.Shape, d1)
n2 = DraftGeomUtils.offsetWire(obj.Shape, d2)
else:
if isinstance(delta, float) and (len(obj.Shape.Edges) == 1):
# circle
c = obj.Shape.Edges[0].Curve
nc = Part.Circle(c.Center, c.Axis, delta)
if len(obj.Shape.Vertexes) > 1:
nc = Part.ArcOfCircle(
nc, obj.Shape.Edges[0].FirstParameter, obj.Shape.Edges[0].LastParameter
)
newwire = Part.Wire(nc.toShape())
p = []
else:
newwire = DraftGeomUtils.offsetWire(obj.Shape, delta)
if DraftGeomUtils.hasCurves(newwire) and copy:
p = []
else:
p = DraftGeomUtils.getVerts(newwire)
if occ:
newobj = App.ActiveDocument.addObject("Part::Feature", "Offset")
newobj.Shape = DraftGeomUtils.offsetWire(obj.Shape, delta, occ=True)
gui_utils.formatObject(newobj, obj)
if not copy:
delete = obj.Name
elif bind:
if not DraftGeomUtils.isReallyClosed(obj.Shape):
if sym:
s1 = n1
s2 = n2
else:
s1 = obj.Shape
s2 = newwire
if s1 and s2:
w1 = s1.Edges
w2 = s2.Edges
w3 = Part.LineSegment(s1.Vertexes[0].Point, s2.Vertexes[0].Point).toShape()
w4 = Part.LineSegment(s1.Vertexes[-1].Point, s2.Vertexes[-1].Point).toShape()
newobj = App.ActiveDocument.addObject("Part::Feature", "Offset")
newobj.Shape = Part.Face(Part.Wire(w1 + [w3] + w2 + [w4]))
else:
print("Draft.offset: Unable to bind wires")
else:
newobj = App.ActiveDocument.addObject("Part::Feature", "Offset")
newobj.Shape = Part.Face(obj.Shape.Wires[0])
if not copy:
delete = obj.Name
elif copy:
newobj = None
if sym:
return None
if utils.get_type(obj) == "Wire":
if p:
newobj = make_wire(p)
newobj.Closed = obj.Closed
elif newwire:
newobj = App.ActiveDocument.addObject("Part::Feature", "Offset")
newobj.Shape = newwire
else:
print("Draft.offset: Unable to duplicate this object")
elif utils.get_type(obj) == "Rectangle":
if p:
length, height, plac = getRect(p, obj)
newobj = make_rectangle(length, height, plac)
elif newwire:
newobj = App.ActiveDocument.addObject("Part::Feature", "Offset")
newobj.Shape = newwire
else:
print("Draft.offset: Unable to duplicate this object")
elif utils.get_type(obj) == "Circle":
pl = obj.Placement
newobj = make_circle(delta)
newobj.FirstAngle = obj.FirstAngle
newobj.LastAngle = obj.LastAngle
newobj.Placement = pl
elif utils.get_type(obj) == "Polygon":
pl = obj.Placement
newobj = make_polygon(obj.FacesNumber)
newobj.Radius = getRadius(obj, delta)
newobj.DrawMode = obj.DrawMode
newobj.Placement = pl
elif utils.get_type(obj) == "BSpline":
newobj = make_bspline(delta)
newobj.Closed = obj.Closed
else:
# try to offset anyway
try:
if p:
newobj = make_wire(p)
newobj.Closed = DraftGeomUtils.isReallyClosed(obj.Shape)
except Part.OCCError:
pass
if (not newobj) and newwire:
newobj = App.ActiveDocument.addObject("Part::Feature", "Offset")
newobj.Shape = newwire
if not newobj:
print("Draft.offset: Unable to create an offset")
if newobj:
gui_utils.formatObject(newobj, obj)
else:
newobj = None
if sym:
return None
if utils.get_type(obj) == "Wire":
if obj.Base or obj.Tool:
App.Console.PrintWarning("Warning: object history removed\n")
obj.Base = None
obj.Tool = None
obj.Placement = App.Placement() # p points are in the global coordinate system
obj.Points = p
elif utils.get_type(obj) == "BSpline":
# print(delta)
obj.Points = delta
# print("done")
elif utils.get_type(obj) == "Rectangle":
length, height, plac = getRect(p, obj)
obj.Placement = plac
obj.Length = length
obj.Height = height
elif utils.get_type(obj) == "Circle":
obj.Radius = delta
elif utils.get_type(obj) == "Polygon":
obj.Radius = getRadius(obj, delta)
elif utils.get_type(obj) == "Part":
print("unsupported object") # TODO
newobj = obj
if copy and params.get_param("selectBaseObjects"):
gui_utils.select(obj)
else:
gui_utils.select(newobj)
if delete:
App.ActiveDocument.removeObject(delete)
return newobj
## @}
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