Eryn Wells
327cc90b2e
Move quit event handling to the interface and flatten the Action class hierarchy. There are no longer any actions that don't take an Actor. This has the happy side effect of resolving some pylint errors too. :)
242 lines
8.5 KiB
Python
242 lines
8.5 KiB
Python
# Eryn Wells <eryn@erynwells.me>
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'''Defines the core game engine.'''
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import random
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from typing import MutableSet
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import tcod
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from . import log
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from . import monsters
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from .actions.action import Action
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from .actions.result import ActionResult
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from .ai import HostileEnemy
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from .configuration import Configuration
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from .events import EngineEventHandler, GameOverEventHandler
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from .map import Map
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from .map.generator import RoomsAndCorridorsGenerator
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from .map.generator.cellular_atomata import CellularAtomataMapGenerator
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from .map.generator.corridor import ElbowCorridorGenerator
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from .map.generator.room import (
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BSPRectMethod,
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CellularAtomatonRoomMethod,
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OrRoomMethod,
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RoomGenerator,
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RectangularRoomMethod)
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from .messages import MessageLog
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from .object import Actor, Entity, Hero, Monster
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class Engine:
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'''The main game engine.
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This class provides the event handling, map drawing, and maintains the list of entities.
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Attributes
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----------
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configuration : Configuration
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Defines the basic configuration for the game
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entities : MutableSet[Entity]
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A set of all the entities on the current map, including the Hero
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hero : Hero
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The hero, the Entity controlled by the player
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map : Map
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A map of the current level
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rng : tcod.random.Random
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A random number generator
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'''
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def __init__(self, config: Configuration):
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self.configuration = config
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self.current_turn = 1
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self.did_begin_turn = False
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self.did_successfully_process_actions_for_turn = False
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self.rng = tcod.random.Random()
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self.message_log = MessageLog()
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map_generator = RoomsAndCorridorsGenerator(
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RoomGenerator(
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RoomGenerator.Configuration(
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rect_method=BSPRectMethod(
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BSPRectMethod.Configuration(number_of_rooms=30)),
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room_method=OrRoomMethod(
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methods=[
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(0.2, CellularAtomatonRoomMethod(CellularAtomataMapGenerator.Configuration())),
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(0.8, RectangularRoomMethod())
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]
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)
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)
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),
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ElbowCorridorGenerator())
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self.map = Map(config, map_generator)
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self.event_handler = EngineEventHandler(self)
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self.entities: MutableSet[Entity] = set()
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try:
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hero_start_position = self.map.up_stairs[0]
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except IndexError:
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hero_start_position = self.map.random_walkable_position()
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self.hero = Hero(position=hero_start_position)
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self.entities.add(self.hero)
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while len(self.entities) < 25:
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should_spawn_monster_chance = random.random()
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if should_spawn_monster_chance < 0.1:
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continue
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while True:
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random_start_position = self.map.random_walkable_position()
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if not any(ent.position == random_start_position for ent in self.entities):
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break
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spawn_monster_chance = random.random()
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if spawn_monster_chance > 0.8:
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monster = Monster(monsters.Troll, ai_class=HostileEnemy, position=random_start_position)
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else:
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monster = Monster(monsters.Orc, ai_class=HostileEnemy, position=random_start_position)
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log.ENGINE.info('Spawning %s', monster)
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self.entities.add(monster)
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self.update_field_of_view()
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self.message_log.add_message('Greetings adventurer!', fg=(127, 127, 255), stack=False)
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def process_input_action(self, action: Action):
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'''Process an Action from player input'''
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if not isinstance(action, Action):
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action.perform(self)
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return
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self.begin_turn()
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log.ACTIONS_TREE.info('Processing Hero Actions')
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log.ACTIONS_TREE.info('|-> %s', action.actor)
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result = self._perform_action_until_done(action)
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# Player's action failed, don't proceed with turn.
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if not result.success and result.done:
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self.did_successfully_process_actions_for_turn = False
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return
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self.did_successfully_process_actions_for_turn = True
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self.process_entity_actions()
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self.update_field_of_view()
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self.finish_turn()
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def process_entity_actions(self):
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'''Run AI for entities that have them, and process actions from those AIs'''
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hero_position = self.hero.position
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# Copy the list so we only act on the entities that exist at the start of this turn. Sort it by Euclidean
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# distance to the Hero, so entities closer to the hero act first.
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entities = sorted(
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self.entities,
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key=lambda e: e.position.euclidean_distance_to(hero_position))
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log.ACTIONS_TREE.info('Processing Entity Actions')
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for i, ent in enumerate(entities):
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if not isinstance(ent, Actor):
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continue
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ent_ai = ent.ai
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if not ent_ai:
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continue
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if self.map.visible[tuple(ent.position)]:
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log.ACTIONS_TREE.info('%s-> %s', '|' if i < len(entities) - 1 else '`', ent)
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action = ent_ai.act(engine=self)
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if action:
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self._perform_action_until_done(action)
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def _perform_action_until_done(self, action: Action) -> ActionResult:
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'''Perform the given action and any alternate follow-up actions until the action chain is done.'''
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result = action.perform(self)
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if log.ACTIONS_TREE.isEnabledFor(log.INFO) and self.map.visible[tuple(action.actor.position)]:
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if result.alternate:
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alternate_string = f'{result.alternate.__class__.__name__}[{result.alternate.actor}]'
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else:
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alternate_string = str(result.alternate)
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log.ACTIONS_TREE.info(
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'| %s-> %s => success=%s done=%s alternate=%s',
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'|' if not result.success or not result.done else '`',
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action,
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result.success,
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result.done,
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alternate_string)
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while not result.done:
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assert result.alternate is not None, f'Action {result.action} incomplete but no alternate action given'
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action = result.alternate
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result = action.perform(self)
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if log.ACTIONS_TREE.isEnabledFor(log.INFO) and self.map.visible[tuple(action.actor.position)]:
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if result.alternate:
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alternate_string = f'{result.alternate.__class__.__name__}[{result.alternate.actor}]'
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else:
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alternate_string = str(result.alternate)
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log.ACTIONS_TREE.info(
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'| %s-> %s => success=%s done=%s alternate=%s',
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'|' if not result.success or not result.done else '`',
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action,
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result.success,
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result.done,
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alternate_string)
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if result.success:
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break
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return result
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def update_field_of_view(self):
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'''Compute visible area of the map based on the player's position and point of view.'''
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self.map.update_visible_tiles(self.hero.position, self.hero.sight_radius)
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# Add visible tiles to the explored grid
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self.map.explored |= self.map.visible
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def begin_turn(self) -> None:
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'''Begin the current turn'''
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if self.did_begin_turn:
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return
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if log.ROOT.isEnabledFor(log.INFO):
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dashes = '-' * 20
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log.ROOT.info('%s Turn %d %s', dashes, self.current_turn, dashes)
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self.did_begin_turn = True
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def finish_turn(self) -> None:
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'''Finish the current turn and prepare for the next turn'''
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if not self.did_successfully_process_actions_for_turn:
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return
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log.ROOT.info('Completed turn %d successfully', self.current_turn)
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self._prepare_for_next_turn()
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def _prepare_for_next_turn(self) -> None:
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self.current_turn += 1
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self.did_begin_turn = False
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self.did_successfully_process_actions_for_turn = False
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def kill_actor(self, actor: Actor) -> None:
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'''Kill an entity. Remove it from the game.'''
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if actor == self.hero:
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# When the hero dies, the game is over.
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log.ACTIONS.info('Time to die.')
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self.event_handler = GameOverEventHandler(self)
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else:
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log.ACTIONS.info('%s dies', actor)
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self.entities.remove(actor)
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