snake.py

import pygame
import time
import random

# Initialize Pygame
pygame.init()

# Constants
WHITE = (255, 255, 255)
YELLOW = (255, 255, 102)
BLACK = (0, 0, 0)
RED = (213, 50, 80)
GREEN = (0, 255, 0)
BLUE = (50, 153, 213)

WIDTH = 600
HEIGHT = 400
SNAKE_BLOCK = 20
SNAKE_SPEED = 15

screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption('Snake Game')
clock = pygame.time.Clock()

font_style = pygame.font.SysFont("arial", 25)
score_font = pygame.font.SysFont("arial", 35)

high_score = 0

def show_score(score):
    value = score_font.render(f"Score: {score}  High Score: {high_score}", True, YELLOW)
    screen.blit(value, [10, 10])

def draw_snake(snake_block, snake_list):
    for x in snake_list:
        pygame.draw.rect(screen, GREEN, [x[0], x[1], snake_block, snake_block])

def game_loop():
    global high_score
    game_over = False
    game_close = False

    # Starting Position
    x1 = WIDTH / 2
    y1 = HEIGHT / 2
    x1_change = 0
    y1_change = 0

    snake_List = []
    Length_of_snake = 1

    # Random Food Position
    foodx = round(random.randrange(0, WIDTH - SNAKE_BLOCK) / 20.0) * 20.0
    foody = round(random.randrange(0, HEIGHT - SNAKE_BLOCK) / 20.0) * 20.0

    while not game_over:

        while game_close == True:
            screen.fill(BLUE)
            msg = font_style.render("C-Play Again | Q-Quit", True, RED)
            screen.blit(msg, [WIDTH / 3, HEIGHT / 3])
            show_score(Length_of_snake - 1)
            pygame.display.update()

            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_over = True
                        game_close = False
                    if event.key == pygame.K_c:
                        game_loop()

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT and x1_change == 0:
                    x1_change = -SNAKE_BLOCK
                    y1_change = 0
                elif event.key == pygame.K_RIGHT and x1_change == 0:
                    x1_change = SNAKE_BLOCK
                    y1_change = 0
                elif event.key == pygame.K_UP and y1_change == 0:
                    y1_change = -SNAKE_BLOCK
                    x1_change = 0
                elif event.key == pygame.K_DOWN and y1_change == 0:
                    y1_change = SNAKE_BLOCK
                    x1_change = 0

        # Boundary Check
        if x1 >= WIDTH or x1 < 0 or y1 >= HEIGHT or y1 < 0:
            game_close = True
        
        x1 += x1_change
        y1 += y1_change
        screen.fill(BLACK)
        
        # Draw Food
        pygame.draw.rect(screen, RED, [foodx, foody, SNAKE_BLOCK, SNAKE_BLOCK])
        
        # Snake Movement Logic
        snake_Head = [x1, y1]
        snake_List.append(snake_Head)
        if len(snake_List) > Length_of_snake:
            del snake_List[0]

        # Self-Collision Check
        for x in snake_List[:-1]:
            if x == snake_Head:
                game_close = True

        draw_snake(SNAKE_BLOCK, snake_List)
        
        current_score = Length_of_snake - 1
        if current_score > high_score:
            high_score = current_score
            
        show_score(current_score)
        pygame.display.update()

        # Eating Food Logic
        if x1 == foodx and y1 == foody:
            foodx = round(random.randrange(0, WIDTH - SNAKE_BLOCK) / 20.0) * 20.0
            foody = round(random.randrange(0, HEIGHT - SNAKE_BLOCK) / 20.0) * 20.0
            Length_of_snake += 1

        clock.tick(SNAKE_SPEED)

    pygame.quit()
    quit()

game_loop()