def add_roll_off(curve, roll_off_curve, direction, roll_radius, offset_extra,
roll_off):
if direction == "on":
return
if roll_off is None:
return
if curve.getNumVertices() <= 1:
return
last_span = curve.GetLastSpan()
if roll_off == 'auto':
if roll_radius < 0.0000000001:
return
v = last_span.GetVector(1.0) # get end direction
if direction == 'right':
off_v = area.Point(v.y, -v.x)
else:
off_v = area.Point(-v.y, v.x)
rollend = last_span.v.p + off_v * roll_radius
else:
rollend = roll_off
# add the end of the original kurve
roll_off_curve.append(last_span.v.p)
if rollend == last_span.v.p:
return
rvertex = area.Vertex(rollend)
v = last_span.GetVector(1.0) # get end direction
rvertex.c, rvertex.type = area.TangentialArc(last_span.v.p, rollend, v)
# add the roll off arc
roll_off_curve.append(rvertex)
def add_roll_on(curve, roll_on_curve, direction, roll_radius, offset_extra, roll_on):
if direction == "on":
roll_on = None
if curve.getNumVertices() <= 1:
return
first_span = curve.GetFirstSpan()
if roll_on is None:
rollstart = first_span.p
elif roll_on == 'auto':
if roll_radius < 0.0000000001:
rollstart = first_span.p
v = first_span.GetVector(0.0)
if direction == 'right':
off_v = area.Point(v.y, -v.x)
else:
off_v = area.Point(-v.y, v.x)
rollstart = first_span.p + off_v * roll_radius
else:
rollstart = roll_on
rvertex = area.Vertex(first_span.p)
if first_span.p == rollstart:
rvertex.type = 0
else:
v = first_span.GetVector(0.0) # get start direction
rvertex.c, rvertex.type = area.TangentialArc(
first_span.p, rollstart, -v)
rvertex.type = -rvertex.type # because TangentialArc was used in reverse
# add a start roll on point
roll_on_curve.append(rollstart)
# add the roll on arc
roll_on_curve.append(rvertex)
