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142 lines
4.6 KiB
Python
142 lines
4.6 KiB
Python
from __future__ import annotations
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from soil import *
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from soil import events
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from mesa.space import MultiGrid
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from enum import Enum
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@dataclass
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class Journey:
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origin: (int, int)
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destination: (int, int)
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tip: float
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passenger: Passenger = None
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driver: Driver = None
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class City(EventedEnvironment):
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def __init__(self, *args, n_cars=1, height=100, width=100, n_passengers=10, agents=None, **kwargs):
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self.grid = MultiGrid(width=width, height=height, torus=False)
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if agents is None:
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agents = []
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for i in range(n_cars):
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agents.append({'agent_class': Driver})
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for i in range(n_passengers):
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agents.append({'agent_class': Passenger})
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super().__init__(*args, agents=agents, **kwargs)
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for agent in self.agents:
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self.grid.place_agent(agent, (0, 0))
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self.grid.move_to_empty(agent)
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class Driver(Evented, FSM):
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pos = None
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journey = None
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earnings = 0
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def on_receive(self, msg, sender):
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if self.journey is None and isinstance(msg, Journey) and msg.driver is None:
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msg.driver = self
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self.journey = msg
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@default_state
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@state
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def wandering(self):
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target = None
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self.check_passengers()
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self.journey = None
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while self.journey is None:
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if target is None or not self.move_towards(target):
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target = self.random.choice(self.model.grid.get_neighborhood(self.pos, moore=False))
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self.check_passengers()
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self.check_messages() # This will call on_receive behind the scenes
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yield Delta(30)
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try:
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self.journey = yield self.journey.passenger.ask(self.journey, timeout=60)
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except events.TimedOut:
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self.journey = None
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return
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return self.driving
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def check_passengers(self):
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c = self.count_agents(agent_class=Passenger)
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self.info(f"Passengers left {c}")
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if not c:
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self.die()
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@state
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def driving(self):
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#Approaching
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while self.move_towards(self.journey.origin):
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yield
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while self.move_towards(self.journey.destination, with_passenger=True):
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yield
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self.check_passengers()
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return self.wandering
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def move_towards(self, target, with_passenger=False):
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'''Move one cell at a time towards a target'''
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self.info(f"Moving { self.pos } -> { target }")
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if target[0] == self.pos[0] and target[1] == self.pos[1]:
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return False
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next_pos = [self.pos[0], self.pos[1]]
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for idx in [0, 1]:
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if self.pos[idx] < target[idx]:
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next_pos[idx] += 1
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break
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if self.pos[idx] > target[idx]:
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next_pos[idx] -= 1
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break
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self.model.grid.move_agent(self, tuple(next_pos))
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if with_passenger:
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self.journey.passenger.pos = self.pos # This could be communicated through messages
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return True
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class Passenger(Evented, FSM):
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pos = None
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@default_state
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@state
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def asking(self):
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destination = (self.random.randint(0, self.model.grid.height), self.random.randint(0, self.model.grid.width))
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self.journey = None
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journey = Journey(origin=self.pos,
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destination=destination,
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tip=self.random.randint(10, 100),
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passenger=self)
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timeout = 60
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expiration = self.now + timeout
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self.model.broadcast(journey, ttl=timeout, sender=self, agent_class=Driver)
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while not self.journey:
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self.info(f"Passenger at: { self.pos }. Checking for responses.")
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try:
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yield self.received(expiration=expiration)
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except events.TimedOut:
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self.info(f"Passenger at: { self.pos }. Asking for journey.")
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self.model.broadcast(journey, ttl=timeout, sender=self, agent_class=Driver)
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expiration = self.now + timeout
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self.check_messages()
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return self.driving_home
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def on_receive(self, msg, sender):
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if isinstance(msg, Journey):
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self.journey = msg
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return msg
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@state
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def driving_home(self):
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while self.pos[0] != self.journey.destination[0] or self.pos[1] != self.journey.destination[1]:
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yield self.received(timeout=60)
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self.info("Got home safe!")
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self.die()
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simulation = Simulation(model_class=City, model_params={'n_passengers': 2})
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if __name__ == "__main__":
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with easy(simulation) as s:
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s.run()
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