def setup_canvas(self):
super(LifelineItem, self).setup_canvas()
top = self.lifetime.top
bottom = self.lifetime.bottom
# create constraints to:
# - keep bottom handle below top handle
# - keep top and bottom handle in the middle of the head
c1 = CenterConstraint(self._handles[SW].pos.x, self._handles[SE].pos.x, bottom.pos.x)
c2 = EqualsConstraint(top.pos.x, bottom.pos.x, delta=0.0)
c3 = EqualsConstraint(self._handles[SW].pos.y, top.pos.y, delta=0.0)
self.lifetime._c_min_length = LessThanConstraint(top.pos.y, bottom.pos.y, delta=LifetimeItem.MIN_LENGTH)
self.__constraints = (c1, c2, c3, self.lifetime._c_min_length)
list(map(self.canvas.solver.add_constraint, self.__constraints))
def setup_constraints(self):
top = self.lifetime.top
bottom = self.lifetime.bottom
# create constraints to:
# - keep bottom handle below top handle
# - keep top and bottom handle in the middle of the head
c1 = CenterConstraint(self._handles[SW].pos.x, self._handles[SE].pos.x,
bottom.pos.x)
c2 = EqualsConstraint(top.pos.x, bottom.pos.x, delta=0.0)
c3 = EqualsConstraint(self._handles[SW].pos.y, top.pos.y, delta=0.0)
self.lifetime._c_min_length = LessThanConstraint(
top.pos.y, bottom.pos.y, delta=LifetimeItem.MIN_LENGTH)
for c in [c1, c2, c3, self.lifetime._c_min_length]:
self._connections.add_constraint(self, c)