# wk12_1123_Snake_Pygame

## {實戰#2} : 貪吃蛇專案導讀

! pip install pygame

import pygame, sys, time, random

difficulty = 110

# 難度(difficulty)設定
# Easy      ->  10
# Medium    ->  25
# Hard      ->  40
# Harder    ->  60
# Impossible->  120

pygame 2.5.2 (SDL 2.28.3, Python 3.11.5)
Hello from the pygame community. https://www.pygame.org/contribute.html

# 基礎設定
frame_size_x = 720
frame_size_y = 480

direction = 'RIGHT'
change_to = direction

food_pos = [random.randrange(1, (frame_size_x//10)) * 10, random.randrange(1, (frame_size_y//10)) * 10]
food_spawn = True

score = 0

# 顏色設定(R, G, B)
black = pygame.Color(0, 0, 0)
white = pygame.Color(255, 255, 255)
red = pygame.Color(255, 0, 0)
green = pygame.Color(0, 255, 0)
blue = pygame.Color(0, 0, 255)

# 蛇外觀設定
snake_pos = [100, 50]
snake_body = [[100, 50], [100-10, 50], [100-(2*10), 50]]

fps_controller = pygame.time.Clock()              #幀率設定

pygame.display.set_caption('Snake!')
game_window = pygame.display.set_mode((frame_size_x, frame_size_y))

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_UP or event.key == ord('w'):
                change_to = 'UP'
            if event.key == pygame.K_DOWN or event.key == ord('s'):
                change_to = 'DOWN'
            if event.key == pygame.K_LEFT or event.key == ord('a'):
                change_to = 'LEFT'
            if event.key == pygame.K_RIGHT or event.key == ord('d'):
                change_to = 'RIGHT'
            if event.key == pygame.K_ESCAPE:      #結束遊戲設定
                pygame.event.post(pygame.event.Event(pygame.QUIT))
 
    if change_to == 'UP' and direction != 'DOWN': #排除相反的方向
        direction = 'UP'
    if change_to == 'DOWN' and direction != 'UP':
        direction = 'DOWN'
    if change_to == 'LEFT' and direction != 'RIGHT':
        direction = 'LEFT'
    if change_to == 'RIGHT' and direction != 'LEFT':
        direction = 'RIGHT'
        
    if direction == 'UP':                         #蛇移動控制指標，注意 : 越往下，y越大!!!
        snake_pos[1] -= 10
    if direction == 'DOWN':
        snake_pos[1] += 10
    if direction == 'LEFT':
        snake_pos[0] -= 10
    if direction == 'RIGHT':
        snake_pos[0] += 10
        
    snake_body.insert(0, list(snake_pos))         #蛇變長的設定
    if snake_pos[0] == food_pos[0] and snake_pos[1] == food_pos[1]:
        score += 1
        food_spawn = False
    else:
        snake_body.pop()
        
    if not food_spawn:                            #給食物的設定
        food_pos = [random.randrange(1, (frame_size_x//10)) * 10, random.randrange(1, (frame_size_y//10)) * 10]
    food_spawn = True
    
    game_window.fill(black)
    for pos in snake_body:
        pygame.draw.rect(game_window, green, pygame.Rect(pos[0], pos[1], 10, 10))
        # .draw.rect(play_surface, color, xy-coordinate)
        # xy-coordinate -> .Rect(x, y, size_x, size_y)

    pygame.display.update()                       #重置畫面
    fps_controller.tick(difficulty)               #重置速度

---------------------------------------------------------------------------

NameError Traceback (most recent call last)

Cell In[6], line 42
39 snake_pos[0] += 10
41 snake_body.insert(0, list(snake_pos)) #蛇變長的設定
---> 42 if snake_pos[0] == food_pos[0] and snake_pos[1] == food_pos[1]:
43 score += 1
44 food_spawn = False

NameError: name 'food_pos' is not defined

# Checks for errors encountered
check_errors = pygame.init()
# pygame.init() example output -> (6, 0)
# second number in tuple gives number of errors
if check_errors[1] > 0:
    print(f'[!] Had {check_errors[1]} errors when initialising game, exiting...')
    sys.exit(-1)
else:
    print('[+] Game successfully initialised')

    
# Game Over
def game_over():
    my_font = pygame.font.SysFont('times new roman', 90)
    game_over_surface = my_font.render('YOU DIED', True, red)
    game_over_rect = game_over_surface.get_rect()
    game_over_rect.midtop = (frame_size_x/2, frame_size_y/4)
    game_window.fill(black)
    game_window.blit(game_over_surface, game_over_rect)
    show_score(0, red, 'times', 20)
    pygame.display.flip()
    time.sleep(3)
    pygame.quit()
    sys.exit()


# Score
def show_score(choice, color, font, size):
    score_font = pygame.font.SysFont(font, size)
    score_surface = score_font.render('Score : ' + str(score), True, color)
    score_rect = score_surface.get_rect()
    if choice == 1:
        score_rect.midtop = (frame_size_x/10, 15)
    else:
        score_rect.midtop = (frame_size_x/2, frame_size_y/1.25)
    game_window.blit(score_surface, score_rect)
    # pygame.display.flip()


    # Snake food
    pygame.draw.rect(game_window, white, pygame.Rect(food_pos[0], food_pos[1], 10, 10))

    
    # Game Over conditions
    # Getting out of bounds
    if snake_pos[0] < 0 or snake_pos[0] > frame_size_x-10:
        game_over()
    if snake_pos[1] < 0 or snake_pos[1] > frame_size_y-10:
        game_over()
    # Touching the snake body
    for block in snake_body[1:]:
        if snake_pos[0] == block[0] and snake_pos[1] == block[1]:
            game_over()

    show_score(1, white, 'consolas', 20)

pygame 2.5.2 (SDL 2.28.3, Python 3.10.9)
Hello from the pygame community. https://www.pygame.org/contribute.html
[+] Game successfully initialised

An exception has occurred, use %tb to see the full traceback.

SystemExit

C:\ProgramData\anaconda3\lib\site-packages\IPython\core\interactiveshell.py:3468: UserWarning: To exit: use 'exit', 'quit', or Ctrl-D.
warn("To exit: use 'exit', 'quit', or Ctrl-D.", stacklevel=1)