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snake in napari
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from time import sleep | |
from enum import Enum | |
import napari | |
import numpy as np | |
import psygnal | |
from napari.qt.threading import thread_worker | |
BOARD_SIZE = 14 | |
INITIAL_SNAKE_LENGTH = 4 | |
class Direction(Enum): | |
UP = (-1, 0) | |
DOWN = (1, 0) | |
LEFT = (0, -1) | |
RIGHT = (0, 1) | |
class Snake: | |
board_update = psygnal.Signal() | |
nom = psygnal.Signal() | |
def __init__(self): | |
self.length = INITIAL_SNAKE_LENGTH | |
self.direction = Direction.DOWN | |
self.board = np.zeros((BOARD_SIZE, BOARD_SIZE), dtype=int) | |
start_position = self._random_empty_board_position | |
self._head_position = start_position | |
self.board[start_position] = 1 | |
self.tail = self.board.copy() | |
self.food = np.zeros_like(self.board) | |
self.food[self._random_empty_board_position] = 1 | |
def update(self): | |
self._head_position = self._next_head_position | |
if self.on_food: | |
self.length += 1 | |
self._update_food() | |
self.nom.emit() | |
self.tail[self.tail > 0] += 1 | |
self.tail[self.tail > self.length] = 0 | |
self.tail[self._head_position] = 1 | |
self.board = self.tail > 0 | |
self.board_update.emit() | |
def _update_food(self): | |
self.food = np.zeros_like(self.food) | |
self.food[self._random_empty_board_position] = 1 | |
@property | |
def direction(self): | |
"""not synchronised with velocity""" | |
return self._direction | |
@direction.setter | |
def direction(self, value: Direction): | |
self._velocity_ = value.value | |
self._direction = value | |
@property | |
def about_to_self_collide(self): | |
if self._next_board_value == 1: | |
return True | |
else: | |
return False | |
@property | |
def on_food(self): | |
if self.food[self._head_position] == 1: | |
return True | |
else: | |
return False | |
@property | |
def _head_position(self): | |
return self._head_position_ | |
@_head_position.setter | |
def _head_position(self, value): | |
self._head_position_ = tuple(value) | |
@property | |
def _velocity(self): | |
return self._velocity_ | |
@property | |
def _random_empty_board_position(self): | |
idx = np.where(self.board == 0) | |
n_idx = len(idx[0]) | |
random_idx = np.random.randint(0, n_idx - 1, 1) | |
return int(idx[0][random_idx]), int(idx[1][random_idx]) | |
@property | |
def _next_head_position(self): | |
next_position = np.array(self._head_position) + np.array(self._velocity) | |
next_position[next_position > (BOARD_SIZE - 1)] = 0 | |
next_position[next_position < 0] = BOARD_SIZE - 1 | |
return tuple(next_position) | |
@property | |
def _next_board_value(self): | |
return int(self.board[self._next_head_position]) | |
viewer = napari.Viewer() | |
snake = Snake() | |
outline = np.ones((BOARD_SIZE + 2, BOARD_SIZE + 2)) | |
outline[1:-1, 1:-1] = 0 | |
outline_layer = viewer.add_image(outline, blending='additive', colormap='blue', translate=(-1, -1)) | |
board_layer = viewer.add_image(snake.board, blending='additive') | |
food_layer = viewer.add_image(snake.food, blending='additive', colormap='red') | |
viewer.text_overlay.visible = True | |
@snake.board_update.connect | |
def on_board_update(): | |
viewer.text_overlay.text = f'Score: {snake.length - INITIAL_SNAKE_LENGTH}' | |
board_layer.data = snake.board | |
food_layer.data = snake.food | |
@snake.nom.connect | |
def nom(): | |
print('nom') | |
viewer.text_overlay.text = 'nom nom nom' | |
@viewer.bind_key('w') | |
def up(event=None): | |
snake.direction = Direction.UP | |
@viewer.bind_key('s') | |
def down(event=None): | |
snake.direction = Direction.DOWN | |
@viewer.bind_key('a') | |
def left(event=None): | |
snake.direction = Direction.LEFT | |
@viewer.bind_key('d') | |
def right(event=None): | |
snake.direction = Direction.RIGHT | |
@thread_worker(connect={"yielded": snake.update}) | |
def update_in_background(): | |
while True: | |
sleep(1/10) | |
if snake.about_to_self_collide: | |
print('game over!') | |
sleep(1) | |
snake.__init__() | |
yield | |
worker = update_in_background() | |
napari.run() |
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