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python-roguelike/components/ai.py
2022-01-07 16:48:49 -05:00

41 lines
1.6 KiB
Python

from __future__ import annotations
from typing import List, Tuple
import numpy as np # type: ignore
import tcod
from actions import Action
from components.base_component import BaseComponent
class BaseAI(Action, BaseComponent):
def get_path_to(self, dest_x: int, dest_y: int) -> List[Tuple[int, int]]:
"""Compute and return a path to the target position.
IF there is no valid path then returns an empty list.
"""
# Copy the walkable array.
cost = np.array(self.entity.gamemap.tiles["walkable"], dtype=np.int8)
for entity in self.entity.gamemap.entities:
# Check that an entity blocks movement and the cost isn't zero (blocking.)
if entity.blocks_movement and cost[entity.x, entity.y]:
# Add to the cost of a blocked position.
# A lower number means more enemies will crowd behind each other in
# hallways. A higher number means enemies will take longer paths in
# order to surround the player.
cost[entity.x, entity.y] += 10
# Create a graph from the cost array and pass that graph to a new pathfinder.
graph = tcod.path.SimpleGraph(cost, cardinal=2, diagonal=3)
pathfinder = tcod.path.Pathfinder(graph)
pathfinder.add_root((self.entity.x, self.entity.y)) # Start position
# Compute the path to the destination and remove the starting point.
path: List[List[int]] = pathfinder.path_to((dest_x, dest_y))[1:].tolist()
# Convert from List[List[int]] to List[Tuple[int, int]].
return [(index[0], index[1]) for index in path]