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python-roguelike/procgen.py
2022-02-08 09:21:19 -05:00

218 lines
6.2 KiB
Python

from __future__ import annotations
import random
from typing import Dict, Iterator, List, Tuple, TYPE_CHECKING
import tcod
import entity_factories
from game_map import GameMap
import tile_types
if TYPE_CHECKING:
from engine import Engine
from entity import Entity
max_items_by_floor = [
(1, 1),
(4, 2),
]
max_monsters_by_floor = [
(1, 2),
(4, 3),
(6, 5),
]
item_chances: Dict[int, List[Tuple[Entity, int]]] = {
0: [(entity_factories.health_potion, 35)],
2: [(entity_factories.confusion_scroll, 10)],
4: [(entity_factories.lightning_scroll, 25)],
6: [(entity_factories.fireball_scroll, 25)],
}
enemy_chances: Dict[int, List[Tuple[Entity, int]]] = {
0: [(entity_factories.orc, 80)],
3: [(entity_factories.troll, 15)],
5: [(entity_factories.troll, 30)],
7: [(entity_factories.troll, 60)],
}
def get_max_value_for_floor(
max_value_by_floor: List[Tuple[int, int]],
floor: int
) -> int:
current_value = 0
for floor_minimum, value in max_value_by_floor:
if floor_minimum > floor:
break;
else:
current_value = value;
return current_value
def get_entities_at_random(
weighted_chances_by_floor: Dict[int, List[Tuple[Entity, int]]],
number_of_entities: int,
floor: int,
) -> List[Entity]:
entity_weighted_chances = {}
for key, values in weighted_chances_by_floor.items():
if key > floor:
break
else:
for value in values:
entity = value[0]
weighted_chance = value[1]
entity_weighted_chances[entity] = weighted_chance
entities = list(entity_weighted_chances.keys())
entity_weighted_chance_values = list(entity_weighted_chances.values())
chosen_entities = random.choices(
entities,
weights=entity_weighted_chance_values,
k=number_of_entities
)
return chosen_entities
class RectangularRoom:
def __init__(self, x: int, y: int, width: int, height: int):
self.x1 = x
self.y1 = y
self.x2 = x + width
self.y2 = y + height
@property
def center(self) -> Tuple[int, int]:
center_x = int((self.x1 + self.x2) / 2)
center_y = int((self.y1 + self.y1) / 2)
return center_x, center_y
@property
def inner(self) -> Tuple[slice, slice]:
"""Return the inner area of this room as a 2D array index."""
return slice(self.x1 + 1, self.x2), slice(self.y1 + 1, self.y2)
def intersects(self, other: RectangularRoom) -> bool:
"""Return True if this room overlaps with another RectangularRoom."""
return (
self.x1 <= other.x2
and self.x2 >= other.x1
and self.y1 <= other.y2
and self.y2 >= other.y1
)
def place_entities(
room: RectangularRoom,
dungeon: GameMap,
floor_number: int,
) -> None:
number_of_monsters = random.randint(
0, get_max_value_for_floor(max_monsters_by_floor, floor_number)
)
number_of_items = random.randint(
0, get_max_value_for_floor(max_items_by_floor, floor_number)
)
monsters: List[Entity] = get_entities_at_random(
enemy_chances,
number_of_monsters,
floor_number
)
items: List[Entity] = get_entities_at_random(
item_chances,
number_of_items,
floor_number
)
for entity in monsters + items:
x = random.randint(room.x1 + 1, room.x2 - 1)
y = random.randint(room.y1 + 1, room.y2 - 1)
if not any(entity.x == x and entity.y == y for entity in dungeon.entities):
entity.spawn(dungeon, x, y)
def tunnel_between(start: Tuple[int, int], end: Tuple[int, int]) -> Iterator[Tuple[int, int]]:
"""Return an L-shaped tunnel between these two points."""
x1, y1 = start
x2, y2 = end
if random.random() < 0.5: # 50% chance.
# Move horizontally, then vertically
corner_x, corner_y = x2, y1
else:
# Move vertically, then horizontally
corner_x, corner_y = x1, y2
# Generate the coordinates for this tunnel
for x, y in tcod.los.bresenham((x1, y1), (corner_x, corner_y)).tolist():
yield x, y
for x, y in tcod.los.bresenham((corner_x, corner_y), (x2, y2)).tolist():
yield x, y
def generate_dungeon(
max_rooms: int,
room_min_size: int,
room_max_size: int,
map_width: int,
map_height: int,
engine: Engine,
) -> GameMap:
"""Generate a new dungeon map."""
player = engine.player
dungeon = GameMap(engine, map_width, map_height, entities=[player])
rooms: List[RectangularRoom] = []
center_of_last_room = (0, 0)
for r in range(max_rooms):
room_width = random.randint(room_min_size, room_max_size)
room_height = random.randint(room_min_size, room_max_size)
x = random.randint(0, dungeon.width - room_width - 1)
y = random.randint(0, dungeon.height - room_height - 1)
# "RectangularRoom" class makes rectangles easier to work with
new_room = RectangularRoom(x, y, room_width, room_height)
# Run through the other rooms and see if they intersect with this one.
# If there are no intersections then the room is valid
if any(new_room.intersects(other_room) for other_room in rooms):
continue # This room intersects, so go to the next attempt.
# Dig out this room's inner area.
dungeon.tiles[new_room.inner] = tile_types.floor
if len(rooms) == 0:
# The first room, where the player starts.
player.place(*new_room.center, dungeon)
else: # All rooms after the first.
# Dig out a tunnel between this room and the previous one
for x, y in tunnel_between(rooms[-1].center, new_room.center):
dungeon.tiles[x, y] = tile_types.floor
center_of_last_room = new_room.center
place_entities(new_room, dungeon, engine.game_world.current_floor)
dungeon.tiles[center_of_last_room] = tile_types.down_stairs
dungeon.downstairs_location = center_of_last_room
# Finally, append the new room to the list.
rooms.append(new_room)
return dungeon