def __init__(self, box1, box2, boxdists=[0,0]):
self.box1 = box1
self.box2 = box2
connector_pt.__init__(self,
[path.normsubpath([path.normline_pt(self.box1.center[0], self.box1.center[1],
self.box2.center[0], self.box2.center[1])], closed=0)])
self.omitends(box1, box2)
self.shortenpath(boxdists)
def __init__(self, box1, box2, relangle=45,
absbulge=None, relbulge=None, boxdists=[0,0]):
# the deviation of arc from the straight line can be specified:
# 1. By an angle between a straight line and the arc
# This angle is measured at the centers of the box.
# 2. By the largest normal distance between line and arc: absbulge
# or, equivalently, by the bulge relative to the length of the
# straight line from center to center.
# Only one can be used.
self.box1 = box1
self.box2 = box2
tangent = (self.box2.center[0] - self.box1.center[0],
self.box2.center[1] - self.box1.center[1])
distance = hypot(*tangent)
tangent = tangent[0] / distance, tangent[1] / distance
if relbulge is not None or absbulge is not None:
# usage of bulge overrides the relangle parameter
bulge = 0
if absbulge is not None:
bulge += absbulge
if relbulge is not None:
bulge += relbulge*distance
else:
# otherwise use relangle, which should be present
bulge = 0.5 * distance * math.tan(0.5*radians(relangle))
if abs(bulge) < normpath._epsilon:
# fallback solution for too straight arcs
connector_pt.__init__(self,
[path.normsubpath([path.normline_pt(*(self.box1.center+self.box2.center))], closed=0)])
else:
radius = abs(0.5 * (bulge + 0.25 * distance**2 / bulge))
centerdist = mathutils.sign(bulge) * (radius - abs(bulge))
center = (0.5 * (self.box1.center[0] + self.box2.center[0]) + tangent[1]*centerdist,
0.5 * (self.box1.center[1] + self.box2.center[1]) - tangent[0]*centerdist)
angle1 = atan2(self.box1.center[1] - center[1], self.box1.center[0] - center[0])
angle2 = atan2(self.box2.center[1] - center[1], self.box2.center[0] - center[0])
if bulge > 0:
connectorpath = path.path(path.moveto_pt(*self.box1.center),
path.arcn_pt(center[0], center[1], radius, degrees(angle1), degrees(angle2)))
connector_pt.__init__(self, connectorpath.normpath().normsubpaths)
else:
connectorpath = path.path(path.moveto_pt(*self.box1.center),
path.arc_pt(center[0], center[1], radius, degrees(angle1), degrees(angle2)))
connector_pt.__init__(self, connectorpath.normpath().normsubpaths)
self.omitends(box1, box2)
self.shortenpath(boxdists)
