def attack(self, robot_id):
"""
Attacking is modelled on a Claymore. Damage is determined by the
`inverse square`_ of the distance.
.. _inverse square: http://en.wikipedia.org/wiki/Inverse-square_law
"""
loop = asyncio.get_event_loop()
now = loop.time()
attacker = self._robots[robot_id]
if (
attacker['attacked_at'] is not None and
(now - attacker['attacked_at']) * 1000 < settings['attack_interval']
):
# Attacker must wait a second before firing
logger.info('{robot} unable to attack yet'.format(robot=attacker['instance']))
return
attacker['attacked_at'] = now
logger.info('{robot} attack'.format(robot=attacker['instance']))
for target in self.active_robots():
if is_in_angle(attacker['coords'],
attacker['heading'],
settings['attack_angle'],
target['coords']):
dist = get_dist(attacker['coords'], target['coords'])
dist = max(dist, 1) # Make sure distance between robots is reasonable
# Inverse square law. Drop values < 0
damage = int(settings['attack_damage'] / dist ** 2)
if damage:
logger.info('{robot} suffered {damage} damage'.format(
robot=target['instance'],
damage=damage))
target['damage'] += damage
target['instance'].attacked().send(attacker['instance'].__class__.__name__)
def radar_updated(self):
"""
Stops when the robot is close to the middle
"""
while True:
_ = yield
# Are we there yet?
dist = get_dist(self.coords, self._get_middle())
# TODO: Reduce speed as we approach
if dist < 10:
# Stop
self.speed = 0
def _find_closest(self, radar, coords=None):
"""
Find the closest other robot.
Returns coordinates, distance.
"""
if coords is None:
coords = self.coords
dist = closest = None
for robot in radar:
name = robot['name']
if name == self.__class__.__name__:
continue
d = get_dist(coords, robot['coords'])
if dist is None or d < dist:
dist = d
closest = robot['coords']
return closest, dist
