我正在使用python中的pygame模块编写一个蛇游戏,并且非常接近最终但遇到了一些无法预料的问题。我的代码运行但我的蛇不会左转,当我与苹果碰撞时,我的体积不会增大,苹果也不会消失。此外,当我的角色击中墙壁时,结束屏幕也不会出现。我很肯定这是由于我的代码中的一些小问题,并希望任何人看一看,看看他们是否可以根除我,因为我无法这样做。此外,非常感谢任何改进代码的技巧。
import sys, time, random, pygame
from random import randrange
pygame.init()
fps_controller = pygame.time.Clock()
#Screen Dimensions
screen_width = 800
screen_height = 800
#Screen Set Up
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("Snake by Bela Zumbansen")
pygame.mouse.set_visible(0)
#Colours
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLACK = (0, 0, 0)
GREY = (200, 200, 200)
BLUE = (0, 0, 255)
WHITE = (255, 255, 255)
LIGHTBLUE = (0, 155, 155)
#Directions
RIGHT = 1
LEFT = 2
UP = 3
DOWN = 4
#Game Set Up
snake_pos = [100, 100]
snake_body = [[100, 100], [190, 100], [180, 400]]
snake_speed = 10
apple_pos = [random.randrange(1,80)*10, random.randrange(1,80)*10]
apple_spawn = True
direction = RIGHT
update = direction
score = 0
def over():
run = False
return run
def game_over():
screen.fill(LIGHTBLUE)
draw_text("GAME OVER", 48, WHITE, screen_width/2, screen_height/4)
draw_text("Score: " + str(score), 22, WHITE, screen_width / 2, screen_height / 3)
draw_text("Press SPACE to play again or ESC to exit", 22, WHITE, screen_width/2, screen_height / 4)
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_SPACE:
run = True
if event.key == pygame.K_ESCAPE:
pygame.quit()
return run
def draw_text(text, size, color, x, y):
font = pygame.font.Font('freesansbold.ttf', size)
TextSurf, TextRect = text_objects(text, font, color)
TextRect.center = (x, y)
screen.blit(TextSurf, TextRect)
def text_objects(text, font, color):
textSurface = font.render(text, True, color)
return textSurface, textSurface.get_rect()
def eating_apple():
global score, apple_spawn
score += 1
apple_spawn = False
def spawnApple():
global apple_pos
apple_pos = [random.randrange(1,80)*10, random.randrange(1,80)*10]
def score(score):
font = pygame.font.SysFont(None, 25)
text = font.render("Score: "+str(score), True, WHITE)
screen.blit(text,(10,10))
def main():
global update, direction, run, snake_pos, snake_speed, apple_spawn, apple_pos
pygame.time.delay(60)
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
keys = pygame.key.get_pressed()
if keys[pygame.K_LEFT]:
update = 'LEFT'
elif keys[pygame.K_RIGHT]:
update = RIGHT
elif keys[pygame.K_UP]:
update = UP
elif keys[pygame.K_DOWN]:
update = DOWN
if update == RIGHT and direction != LEFT:
direction = RIGHT
if update == LEFT and direction != RIGHT:
direction = LEFT
if update == UP and direction != DOWN:
direction = UP
if update == DOWN and direction != UP:
direction = DOWN
if direction == RIGHT:
snake_pos[0] += snake_speed
if direction == LEFT:
snake_pos[0] -= snake_speed
if direction == UP:
snake_pos[1] -= snake_speed
if direction == DOWN:
snake_pos[1] += snake_speed
snake_body.insert(0, list(snake_pos))
if snake_pos[0] == apple_pos[0] and snake_pos[1] == apple_pos[1]:
eating_apple()
else:
snake_body.pop()
if not apple_spawn:
spawnApple()
screen.fill(BLACK)
for pos in snake_body:
# Snake body
# .draw.rect(play_surface, color, xy-coordinate)
# xy-coordinate -> .Rect(x, y, size_x, size_y)
pygame.draw.rect(screen, GREEN, pygame.Rect(pos[0], pos[1], 20, 20))
pygame.draw.rect(screen, RED, pygame.Rect(apple_pos[0], apple_pos[1], 20, 20))
if snake_pos[0] < 0 or snake_pos[0] > screen_width-20:
over()
if snake_pos[1] < 0 or snake_pos[1] > screen_height-20:
over()
for block in snake_body[1:]:
if snake_pos[0] == block[0] and snake_pos[1] == block[1]:
over()
# score(score)
pygame.display.update()
fps_controller.tick(25)
#main loop
run = True
while run:
main()
while not run:
game_over()
[...]我的蛇不会左转[...]
它必须是update = LEFT
而不是update = 'LEFT'
[...]当我与苹果碰撞时,我不会长大,苹果也不会消失
有一个变量和一个名为score
的函数。重命名变量,例如scoreval。另请参见[Python:具有相同名称的函数和变量](Python:具有相同名称的函数和变量):
scoreval = 0
def eating_apple():
global scoreval, apple_spawn
scoreval += 1
apple_spawn = False
使用pygame.Rect.colliderect()
,检查蛇头是否吃苹果:
if pygame.Rect(*snake_pos, 20, 20).colliderect(*apple_pos, 20, 20):
eating_apple()
else:
snake_body.pop()
当苹果产卵时,必须重置状态apple_spawn
:
def spawnApple():
global apple_pos, apple_spawn
apple_pos = [random.randrange(1,80)*10, random.randrange(1,80)*10]
apple_spawn = True
参考评论:
[...]我仍然遇到的是,如果蛇与自身发生碰撞或撞到墙上,游戏就不会结束。我有那些陈述,所以我有点迷失为什么没有发生[...]
您必须使用global
statement在函数run
中更改全局范围内变量over
的值:
def over():
global run
run = False