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snake.py
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snake.py
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import pygame
import random
# CONSTANTS
WIDTH, HEIGHT = 800, 680
WIN = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Snake")
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
LIME = (0, 255, 0)
RED = (255, 0, 0)
BOX_SIDE_LENGTH = 40
FULL_BOX_WIDTH = 0
EMPTY_BOX_WIDTH = 1
STARTING_GRID_X = 0
STARTING_GRID_Y = 0
STARTING_SNAKE_INDEX = 194
STARTING_APPLE_INDEX = 50
# CLASSES
class Box(object):
def __init__(self, x, y):
self.x = x
self.y = y
self.grid_position = None
self.color = BLACK
self.width = EMPTY_BOX_WIDTH
class Grid(object):
grid = []
def __init__(self):
self.fill_grid_list()
def fill_grid_list(self):
continuing_x = STARTING_GRID_X
continuing_y = STARTING_GRID_Y
while continuing_y < HEIGHT:
while continuing_x < WIDTH:
box = Box(continuing_x, continuing_y)
Grid.grid.append(box)
box.grid_position = Grid.grid.index(box)
continuing_x += BOX_SIDE_LENGTH
continuing_x = STARTING_GRID_X
continuing_y += BOX_SIDE_LENGTH
def draw_grid(self):
for box in Grid.grid:
pygame.draw.rect(WIN, box.color, pygame.Rect(box.x, box.y,
BOX_SIDE_LENGTH, BOX_SIDE_LENGTH), box.width)
class Snake(object):
snake = []
def __init__(self):
self.make_snake_head()
def make_snake_head(self):
snake_head_grid_box = Grid.grid[STARTING_SNAKE_INDEX]
snake_head = Box(snake_head_grid_box.x,
snake_head_grid_box.y)
snake_head.grid_position = STARTING_SNAKE_INDEX
snake_head.direction = "left"
Snake.snake.append(snake_head)
def assign_snake_positions(self):
for snake_box in Snake.snake:
for box in Grid.grid:
if (snake_box.x, snake_box.y) == (box.x, box.y):
snake_box.grid_position = Grid.grid.index(box)
def match_snake_with_grid(self):
for snake_box in Snake.snake:
for box in Grid.grid:
if (snake_box.x, snake_box.y) == (box.x, box.y):
box.color = LIME
box.width = FULL_BOX_WIDTH
def move_snake(self):
self.assign_snake_positions()
snake_head = Snake.snake[0]
new_coord_x = snake_head.x
new_coord_y = snake_head.y
if snake_head.direction == "left":
new_coord_x -= BOX_SIDE_LENGTH
elif snake_head.direction == "right":
new_coord_x += BOX_SIDE_LENGTH
elif snake_head.direction == "up":
new_coord_y -= BOX_SIDE_LENGTH
elif snake_head.direction == "down":
new_coord_y += BOX_SIDE_LENGTH
new_coordinates = (new_coord_x, new_coord_y)
for snake_box in Snake.snake:
temporary_coordinates = (snake_box.x, snake_box.y)
old_grid_position = Grid.grid[snake_box.grid_position]
old_grid_position.color = BLACK
old_grid_position.width = EMPTY_BOX_WIDTH
snake_box.x, snake_box.y = new_coordinates
new_coordinates = temporary_coordinates
self.assign_snake_positions()
self.match_snake_with_grid()
def extend_snake(self, apple):
last_index = len(Snake.snake) - 1
snaketail_x = Snake.snake[last_index].x
snaketail_y = Snake.snake[last_index].y
snaketail_grid_position = Snake.snake[last_index].grid_position
self.move_snake()
apple.change_apple_position()
new_box = Box(snaketail_x, snaketail_y)
new_box.grid_position = snaketail_grid_position
Snake.snake.append(new_box)
class Apple(object):
def __init__(self):
self.apple_box = self.make_apple_box()
def make_apple_box(self):
apple_grid_box = Grid.grid[STARTING_APPLE_INDEX]
apple_box = Box(apple_grid_box.x, apple_grid_box.y)
apple_box.grid_position = STARTING_APPLE_INDEX
return apple_box
def find_random_position(self):
new_grid_position = random.randint(0, len(Grid.grid) - 1)
new_position = Grid.grid[new_grid_position]
return new_position
def change_apple_position(self):
valid_position = False
while not valid_position:
new_position = self.find_random_position()
if (new_position.width == EMPTY_BOX_WIDTH):
apple_grid_box = Grid.grid[self.apple_box.grid_position]
apple_grid_box.width = FULL_BOX_WIDTH
apple_grid_box.color = LIME
valid_position = True
self.apple_box.grid_position = Grid.grid.index(new_position)
self.apple_box.x, self.apple_box.y = new_position.x, new_position.y
def match_apple_with_grid(self):
for box in Grid.grid:
if (self.apple_box.x, self.apple_box.y) == (box.x, box.y):
if (box.width == EMPTY_BOX_WIDTH):
box.color = RED
box.width = FULL_BOX_WIDTH
def draw_window(grid):
WIN.fill(WHITE)
grid.draw_grid()
pygame.display.update()
# MAIN
def main():
grid = Grid()
snake = Snake()
global snake_head
snake_head = Snake.snake[0]
apple = Apple()
run = True
clock = pygame.time.Clock()
while run:
clock.tick(8)
direction_changed = False
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
if event.type == pygame.KEYDOWN:
if direction_changed is False:
if event.key == pygame.K_LEFT:
if snake_head.direction != "right":
snake_head.direction = "left"
elif event.key == pygame.K_RIGHT:
if snake_head.direction != "left":
snake_head.direction = "right"
elif event.key == pygame.K_UP:
if snake_head.direction != "down":
snake_head.direction = "up"
elif event.key == pygame.K_DOWN:
if snake_head.direction != "up":
snake_head.direction = "down"
direction_changed = True
draw_window(grid)
snake.move_snake()
if (snake_head.grid_position == apple.apple_box.grid_position):
snake.extend_snake(apple)
for x in range(1, len(Snake.snake) - 1):
if (snake_head.grid_position == Snake.snake[x].grid_position):
run = False
for snake_box in Snake.snake:
if snake_box.x < 0 or snake_box.x > 800:
run = False
if snake_box.y < 0 or snake_box.y > 680:
run = False
apple.match_apple_with_grid()
main()