def __init__(self, radius, pos=(0, 0), vel=(0, 0), **kwds):
radius = float(radius)
super(Circle, self).__init__(
pos, vel,
base_shape=shapes.Circle(radius, null2D),
cbb_radius=radius,
**kwds
)
def __init__(self,
pos=null2D, vel=null2D,
theta=0.0, omega=0.0,
adamping=None,
density=None, mass=None, inertia=None,
base_shape=shapes.Circle(1),
cbb_radius=1.0,
flags=DEFAULT_FLAGS, **kwargs):
super().__init__(pos, vel, flags=flags, **kwargs)
# State variables
self._theta = float(theta)
self._omega = float(omega)
self._alpha = 0.0
# Collision and shapes
self.base_shape = base_shape
self.cbb_radius = cbb_radius
self._shape = None
# Makes mass, inertial and density consistent
if density is not None:
density = float(density)
if mass is None:
mass = density * self.area()
else:
mass = float(mass)
if inertia is None:
inertia = density * \
self.area() * self.ROG_sqr() / INERTIA_SCALE
else:
inertia = float(inertia)
elif mass is not None:
mass = float(mass)
try:
density = mass / self.area()
except ZeroDivisionError:
density = float('inf')
if inertia is None:
inertia = mass * self.ROG_sqr() / INERTIA_SCALE
else:
inertia = float(inertia)
else:
density = 1.0
area = self.area()
if area:
mass = density * self.area()
if inertia is None:
inertia = density * \
self.area() * self.ROG_sqr() / INERTIA_SCALE
else:
inertia = float(inertia)
else:
mass = 1.0
density = float('inf')
inertia = 0.0
self._invmass = safe_div(1.0, mass)
self._invinertia = safe_div(1.0, inertia)
self._density = float(density)
def cbb(self):
return shapes.Circle(self.cbb_radius, self.pos)