87 lines
2.5 KiB
Python
87 lines
2.5 KiB
Python
from __future__ import annotations
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from typing import Optional, Tuple, TYPE_CHECKING
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if TYPE_CHECKING:
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from engine import Engine
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from entity import Entity
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class Action:
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def __init__(self, entity: Entity) -> None:
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super().__init__()
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self.entity = entity
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@property
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def engine(self) -> Engine:
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"""Return the engine this action belongs to."""
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return self.entity.gamemap.engine
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def perform(self) -> None:
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"""Perform this action with the objects needed to determine its scope.
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`self.engine` is the scope this action is being performed in.
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`self.entity` is the object performing the action.
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This method must be overwritten by Action subclasses.
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"""
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raise NotImplementedError()
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class EscapeAction(Action):
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def perform(self) -> None:
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raise SystemExit()
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class ActionWithDirection(Action):
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def __init__(self, entity, dx: int, dy: int):
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super().__init__(entity)
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self.dx = dx
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self.dy = dy
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@property
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def dest_xy(self) -> Tuple[int, int]:
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"""Returns this action's destination."""
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return self.entity.x + self.dx, self.entity.y + self.dy
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@property
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def blocking_entity(self) -> Optional[Entity]:
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"""Return the blocking entity at this action's destination."""
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return self.engine.game_map.get_blocking_entity_at_location(*self.dest_xy)
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def perform(self) -> None:
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raise NotImplementedError()
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class MeleeAction(ActionWithDirection):
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def perform(self) -> None:
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target = self.blocking_entity
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if not target:
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return # No entity to attack.
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print(f"You kick the {target.name}, much to its annoyance!")
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class MovementAction(ActionWithDirection):
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def perform(self) -> None:
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dest_x, dest_y = self.dest_xy
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if not self.engine.game_map.in_bounds(dest_x, dest_y):
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return # Destination is out of bounds
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if not self.engine.game_map.tiles["walkable"][dest_x, dest_y]:
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return # Destination is blocked by a tile.
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if self.engine.game_map.get_blocking_entity_at_location(dest_x, dest_y):
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return # Destination is blocked by an entity.
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self.entity.move(self.dx, self.dy)
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class BumpAction(ActionWithDirection):
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def perform(self) -> None:
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if self.blocking_entity:
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return MeleeAction(self.entity, self.dx, self.dy).perform()
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else:
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return MovementAction(self.entity, self.dx, self.dy).perform()
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