def edge_to_bezier(topods_edge):
"""take an edge and returns:
* a bool is_bezier
* the bezier curve
* degrees
* poles
"""
ad = BRepAdaptor_Curve(topods_edge)
if ad.IsRational():
return True, ad.Bezier(), ad.Degree()
return False, None, None
def FindGeometry(self, object: AIS_InteractiveObject):
if object.Type() == AIS_KOI_Shape:
shape = self.myContext.SelectedShape()
if shape.ShapeType() == TopAbs_VERTEX:
pass
elif shape.ShapeType() == TopAbs_EDGE:
curve = BRepAdaptor_Curve(shape)
curve_type = curve.GetType()
if curve_type == GeomAbs_BezierCurve:
return curve.Bezier()
elif curve_type == GeomAbs_BSplineCurve:
return curve.BSpline()
elif curve_type == GeomAbs_Circle:
return Geom_Circle(curve.Circle())
elif curve_type == GeomAbs_Line:
return Geom_Line(curve.Line())
elif shape.ShapeType() == TopAbs_FACE:
pass
def recognize_edge(self, a_edge):
""" Takes a TopoDS shape and tries to identify its nature
whether it is a plane a cylinder a torus etc.
if a plane, returns the normal
if a cylinder, returns the radius
"""
curve = BRepAdaptor_Curve(a_edge)
curve_type = curve.GetType()
if curve_type == GeomAbs_BezierCurve:
print("--> Bezier")
self._selectedShape = curve.Bezier()
elif curve_type == GeomAbs_BSplineCurve:
print("--> BSpline")
self._selectedShape = curve.BSpline()
elif curve_type == GeomAbs_Circle:
print("--> Circle")
self._selectedShape = Geom_Circle(curve.Circle())
else:
# TODO there are plenty other type that can be checked
# see documentation for the BRepAdaptor class
# https://www.opencascade.com/doc/occt-6.9.1/refman/html/class_b_rep_adaptor___surface.html
print("not implemented")
def on_select(shapes):
if len(shapes) < 1:
return
s = shapes[0]
if s.ShapeType() == TopAbs_EDGE:
if s.Orientation() == TopAbs_FORWARD:
print('FORWARD')
else:
print('REVERSED')
tmp = BRepAdaptor_Curve(s)
# display start and endpoints of curve
start_point = tmp.Value(tmp.FirstParameter())
end_point = tmp.Value(tmp.LastParameter())
if s.Orientation() == TopAbs_FORWARD:
display.DisplayColoredShape(
BRepBuilderAPI_MakeVertex(start_point).Vertex(), "BLUE")
display.DisplayColoredShape(
BRepBuilderAPI_MakeVertex(end_point).Vertex(), "RED")
else:
display.DisplayColoredShape(
BRepBuilderAPI_MakeVertex(start_point).Vertex(), "RED")
display.DisplayColoredShape(
BRepBuilderAPI_MakeVertex(end_point).Vertex(), "BLUE")
if tmp.GetType() == GeomAbs_Line:
t = tmp.Line()
gcode = f'G01 X{end_point.X():.6f} Y{end_point.Y():.6f}'
print(
f'line: ({start_point.X():.6f}, {start_point.Y():.6f}) → ({end_point.X():.6f}, {end_point.Y():.6f})'
)
# print(gcode)
print(
f'line parameters: {tmp.FirstParameter():.6f}, {tmp.LastParameter():.6f}'
)
elif tmp.GetType() == GeomAbs_Circle:
t = tmp.Circle()
center_point = t.Location()
# make two line segments, both from the centerpoint, and one to each of the endpoints
# the cross product of the lines determines the direction. positive = CCW, negative = CW
# assume for now the arc is in the XY plane, so only check the sign of z
# assume clockwise for now
# center format arc
v1 = gp_Vec(center_point, start_point)
v2 = gp_Vec(center_point, end_point)
# angle > 0 if acute, < 0 if obtuse
angle = v1.AngleWithRef(v2, gp_Vec(0, 0, 1))
# use cross product to determine direction
v1.Cross(v2)
v1 *= angle
# TODO: verify
CCW = True if v1.Z() > 0 else False
gcode = "G0{0} X{1:.6f} Y{2:.6f} I{3:.6f} J{4:.6f}".format(
2 if CCW else 3, end_point.X(), end_point.Y(),
center_point.X() - start_point.X(),
center_point.Y() - start_point.Y())
print(
"circle: start (%.6f, %.6f), end (%.6f, %.6f), center (%.6f, %.6f), radius %.6f"
% (start_point.X(), start_point.Y(), end_point.X(),
end_point.Y(), center_point.X(), center_point.Y(),
t.Radius()))
print("circle parameters: %.6f, %.6f" %
(tmp.FirstParameter() / math.pi,
tmp.LastParameter() / math.pi))
# print(gcode)
elif tmp.GetType() == GeomAbs_Ellipse:
t = tmp.Ellipse()
x = t.XAxis()
y = t.YAxis()
print("ellipse")
elif tmp.GetType() == GeomAbs_Hyperbola:
t = tmp.Hyperbola()
print("hyperbola")
elif tmp.GetType() == GeomAbs_Parabola:
t = tmp.Parabola()
print("parabola")
elif tmp.GetType() == GeomAbs_BezierCurve:
t = tmp.Bezier()
print("bezier")
elif tmp.GetType() == GeomAbs_BSplineCurve:
t = tmp.BSpline()
print("bspline")
elif tmp.GetType() == GeomAbs_OffsetCurve:
t = tmp.OffsetCurve()
print("offset")
elif tmp.GetType() == GeomAbs_OtherCurve:
print("other")