static mrb_value
ratchet_joint_get_angle(mrb_state *mrb, mrb_value self)
{
  cpConstraint *constraint;
  cpFloat angle;
  Data_Get_Struct(mrb, self, &mrb_cp_constraint_type, constraint);
  angle = cpRatchetJointGetAngle(constraint);
  return mrb_float_value(mrb, (mrb_float)angle);
}
float PhysicsJointRatchet::getAngle() const
{
    return PhysicsHelper::cpfloat2float(cpRatchetJointGetAngle(_cpConstraints.front()));
}