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December 14, 2023 19:21
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ecs_example.py
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from __future__ import annotations | |
import sys | |
import random | |
from dataclasses import dataclass | |
import pygame as pg | |
import glm | |
from glm import vec2 | |
import esper | |
# ============================== | |
# GAME | |
def main(width:int, height:int, include_renderer=True): | |
pg.init() | |
esper.add_processor(Input()) | |
esper.add_processor(Time()) | |
esper.add_processor(Grid()) | |
esper.add_processor(Physics()) | |
esper.add_processor(PlayerMovement()) | |
esper.add_processor(Movement()) | |
if include_renderer: | |
esper.add_processor(Renderer(width, height)) | |
ent = esper.create_entity( | |
PlayerInput(), | |
Position(128), | |
Velocity(128), | |
) | |
if renderer := esper.get_processor(Renderer): | |
res = Resources() | |
tile_map = TileMap(res.surfs['dirt'], 32) | |
renderer.tile_map = tile_map | |
esper.add_component(ent, Sprite( | |
surface=res.surfs['green_circle'] | |
)) | |
while True: | |
esper.process() | |
# ============================== | |
# EXTRAS | |
class Resources: | |
surfs={} | |
def __init__(self): | |
red_rect = pg.Surface(vec2(32)) | |
red_rect.fill((200,0,0)) | |
green_circle = pg.Surface(vec2(32), pg.SRCALPHA) | |
pg.draw.circle(green_circle,(0,200,0),(16,16),16) | |
dirt = pg.image.load('./96x64dirt.png').convert() | |
self.surfs['red_rect'] = red_rect | |
self.surfs['green_circle'] = green_circle | |
self.surfs['dirt'] = dirt | |
class TileMap: | |
tiles = [] | |
tile_size = 0 | |
def __init__(self, tile_surf, tile_size): | |
self.tile_size = tile_size | |
self.tiles = [] | |
for _ in range(100): | |
row = [] | |
for _ in range(100): | |
x = random.randint(0,2) * tile_size | |
y = random.randint(0,1) * tile_size | |
row.append( | |
tile_surf.subsurface( | |
(x, y), (tile_size, tile_size) | |
) | |
) | |
self.tiles.append(row) | |
# ============================== | |
# COMPONENTS | |
class Position(vec2): | |
pass | |
class Velocity(vec2): | |
pass | |
class Accelleration(vec2): | |
pass | |
@dataclass | |
class Sprite: | |
surface: pg.Surface | |
@property | |
def size(self): | |
return vec2(self.surface.get_size()) | |
class PlayerInput: | |
pass | |
# ============================== | |
# PROCESSORS | |
class Time: | |
def __init__(self): | |
self.clock = pg.time.Clock() | |
self.dt = 0.0 | |
self.fps = 0.0 | |
def process(self): | |
self.dt = self.clock.tick(60) * 0.001 | |
self.fps = self.clock.get_fps() | |
pg.display.set_caption(f'{self.fps:0.2f}') | |
class Input: | |
def __init__(self): | |
self.move_left = False | |
self.move_right = False | |
self.move_up = False | |
self.move_down = False | |
self.mpos = vec2() | |
def process(self): | |
for event in pg.event.get(): | |
if (event.type == pg.QUIT or | |
(event.type == pg.KEYDOWN and | |
event.key == pg.K_ESCAPE)): | |
pg.quit() | |
sys.exit() | |
keys = pg.key.get_pressed() | |
self.move_left = keys[pg.K_a] | |
self.move_right = keys[pg.K_d] | |
self.move_up = keys[pg.K_w] | |
self.move_down = keys[pg.K_s] | |
self.mpos = vec2(pg.mouse.get_pos()) | |
class Grid: | |
def __init__(self, cell_size=32): | |
self.cell_size = cell_size | |
self.cells = {} | |
def process(self): | |
self.cells = {} | |
for ent, (pos,) in esper.get_components(Position): | |
key = tuple(map(lambda i: int(i)//self.cell_size, pos)) | |
self.cells.setdefault(key, []).append(ent) | |
def query(self, pos): | |
key = tuple(map(lambda i: int(i)//self.cell_size, pos)) | |
return self.cells.get(key, []) | |
def query_rect(self, pos, size): | |
entities = set() | |
for x in range(pos.x//self.cell_size, (pos.x+size.x)//self.cell_size): | |
for y in range(pos.y//self.cell_size, (pos.y+size.y)//self.cell_size): | |
entities.update(self.cells.get((x, y), [])) | |
return entities | |
class Renderer: | |
def __init__(self, width, height): | |
self.window = pg.display.set_mode((width, height)) | |
self.win_size = vec2(width, height) | |
self.tile_map = None | |
def process(self): | |
self.window.fill((30,20,20)) | |
if self.tile_map: | |
tile_size = self.tile_map.tile_size | |
for y, row in enumerate(self.tile_map.tiles): | |
for x, tile in enumerate(row): | |
self.window.blit( | |
tile, (x * tile_size, y * tile_size) | |
) | |
for _, (pos, spr) in esper.get_components(Position, Sprite): | |
self.window.blit(spr.surface, (pos-(spr.size*0.05))) | |
pg.display.update() | |
class PlayerMovement: | |
def process(self): | |
inp = esper.get_processor(Input) | |
for _, (vel, _) in esper.get_components(Velocity, PlayerInput): | |
direction = vec2() | |
if inp.move_left: | |
direction += vec2(-1,0) | |
if inp.move_right: | |
direction += vec2(1,0) | |
if inp.move_up: | |
direction += vec2(0,-1) | |
if inp.move_down: | |
direction += vec2(0,1) | |
if not direction == vec2(): | |
norm = glm.normalize(direction) | |
vel += norm * 20 | |
class Movement: | |
def __init__(self): | |
self.time = esper.get_processor(Time) | |
def process(self): | |
dt = self.time.dt | |
for _, (pos, vel) in esper.get_components(Position, Velocity): | |
pos += vel * self.time.dt | |
vel *= 0.9 | |
class Physics: | |
def __init__(self): | |
self.time = esper.get_processor(Time) | |
def process(self): | |
dt = self.time.dt | |
for _, (vel, acc) in esper.get_components(Velocity, Accelleration): | |
vel += acc * self.time.dt | |
acc *= 0.0 | |
# ============================== | |
# FIN | |
main(1280, 720) |
Author
f0ursqu4r3
commented
Dec 14, 2023
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