snakeGame.py

# Snake Game!
# by root

# game imports
import pygame, sys, random, time

# initalizing errors
check_errors = pygame.init()
if check_errors[1] > 0:
    print("(!) Had {0} initalising errors, exiting...".format(check_errors[1]))
    sys.exit(-1)
else:
    print("(+) PyGame succesfully initialised!")

# Play surface
playSurface = pygame.display.set_mode((720, 460))
pygame.display.set_caption('Snake game!')

# Colours
red = pygame.Color(255, 0, 0)# game over
green = pygame.Color(0, 255, 0)# snake
blue = pygame.Color(0, 0, 255)# score
black = pygame.Color(0, 0, 0)# score
white = pygame.Color(255, 255, 255)# backgroynd
brown = pygame.Color(165, 42, 42)# food

# FPS controller
fpsController = pygame.time.Clock()

# Important variables
snakePos = [100, 50]
snakeBody = [[100, 50], [90, 50], [80, 50]]

foodPos = [random.randrange(1, 72)*10, random.randrange(1, 46)*10]
foodSpawn = True

direction = 'RIGHT'
changeto = direction

score = 0

# Game over function
def gameOver():
    myFont = pygame.font.SysFont('monaco', 72)
    GOsurf = myFont.render('Game over!', True, red)
    GOrect = GOsurf.get_rect()
    GOrect.midtop = (360, 15)
    playSurface.blit(GOsurf, GOrect)
    showScore(0)
    pygame.display.flip()
    time.sleep(4)
    pygame.quit() #pygame exit
    sys.exit() #console exit
 
def showScore(choice=1):
    sFont = pygame.font.SysFont('monaco', 24)
    Ssurf = sFont.render('Score : {0}'.format(score), True, blue)
    Srect = Ssurf.get_rect()
    if choice == 1:
        Srect.midtop =(80, 10)
    else:
        Srect.midtop =(360, 120)
    playSurface.blit(Ssurf, Srect)
    
# Logic for the game.
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RIGHT or event.key == ord('d'):
                changeto = 'RIGHT'
            if event.key == pygame.K_LEFT or event.key == ord('a'):
                changeto = 'LEFT'
            if event.key == pygame.K_UP or event.key == ord('w'):
                changeto = 'UP'
            if event.key == pygame.K_DOWN or event.key == ord('s'):
                changeto = 'DOWN'
            if event.key == pygame.K_ESCAPE:
                pygame.event.post(pygame.event.Event(pygame.QUIT))
            
    # validation of direction
    if changeto == 'RIGHT' and not direction == 'LEFT':
        direction = 'RIGHT'
    if changeto == 'LEFT' and not direction == 'RIGHT':
        direction = 'LEFT'
    if changeto == 'UP' and not direction == 'DOWN':
        direction = 'UP'
    if changeto == 'DOWN' and not direction == 'UP':
        direction = 'DOWN'

    if direction == 'RIGHT':
        snakePos[0] += 10
    if direction == 'LEFT':
        snakePos[0] -= 10
    if direction == 'UP':
        snakePos[1] -= 10
    if direction == 'DOWN':
        snakePos[1] += 10
        
    # Snake Body mechanism
    snakeBody.insert(0, list(snakePos))
    if snakePos[0] == foodPos[0] and snakePos[1] == foodPos[1]:
        score += 1 
        foodSpawn = False
    else:
        snakeBody.pop()
    
    #Food spawn
    if foodSpawn == False:
        foodPos = [random.randrange(1, 72)*10, random.randrange(1, 46)*10]
    foodSpawn = True
    
    #Background
    playSurface.fill(white)
    
    #Draw Snake
    for pos in snakeBody:
        pygame.draw.rect(playSurface, green, 
        pygame.Rect(pos[0], pos[1], 10, 10))
    
    
    pygame.draw.rect(playSurface, brown,
    pygame.Rect(foodPos[0], foodPos[1], 10, 10))
    
    #Bound
    if snakePos[0] > 710 or snakePos[0] <0:
        gameOver()
    if snakePos[1] > 450 or snakePos[1] <0:
        gameOver()
    
    # Self hit
    for block in snakeBody[1:]:
        if snakePos[0] == block[0] and snakePos[1] == block[1]:
            gameOver()
    
    # common     
    showScore() 
    pygame.display.flip()
    fpsController.tick(20)