save project

snake.py

 import pygame
 from pygame import locals
-# 初始化pygame，为使用pygame做准备
+FK = pygame.time.Clock()
+# 初始化pygame，为使用硬件做准备
 pygame.init()
 
 # 创建一个窗口
+screen = pygame.display.set_mode((660, 480))
 
-background=pygame.image.load('bg.png')
+# 背景
+background = pygame.image.load('bg.png')
+right = pygame.image.load('right.png')
+food = pygame.image.load('apple.png')
+body = pygame.image.load('body.png')
+left=pygame.image.load('left.png')
 right=pygame.image.load('right.png')
-food=pygame.image.load('apple.png')
-body=pygame.image.load('body.png')
-screen=pygame.display.set_mode((660,480))
-FPSCLOCK=pygame.time.Clock()
-x,y=240,120
+up=pygame.image.load('up.png')
+down=pygame.image.load('down.png')
+x,y = 240,120
+position = [(180,90),(180,120),(210,120),(x,y)]
+setheading="right"
+snake_head=right
 while True:
     for event in pygame.event.get():
-        if event.type ==locals.QUIT:
+        if event.type == locals.QUIT:
+            # 接收到退出事件后退出程序
             exit()
+        if event.type==locals.KEYDOWN:
+            if  event.key==locals.K_RIGHT and setheading !="left":
+                 setheading='right'
+                 snake_head=right
+            if  event.key==locals.K_LEFT and setheading !="right":
+                 setheading='left'
+                 snake_head=left
+            if  event.key==locals.K_UP and setheading !="up":
+                 setheading='up'
+                 snake_head=up
+            if  event.key==locals.K_DOWN and setheading !="down":
+                 setheading='down'
+                 snake_head=down   
+    
+    if setheading=="right":
         x+=30
-    screen.blit(background,(0,0))
-    screen.blit(right,(x,y))
-    screen.blit(food,(360,300))
-    screen.blit(body,(210,120))
-    screen.blit(body,(180,120))
-    screen.blit(body,(150,120))
+    elif setheading=="left":
+        x -=30 
+    elif setheading=="up":
+        y -=30
+    else: 
+        y  +=30  
+    position.append((x,y))
+    position.pop(0)
+    # 将背景图画上去
+    screen.blit(background, (0, 0))
+    # 将贪吃蛇画上去
+    screen.blit(snake_head, position[-1])
+    # 将贪吃蛇的身体画上去
+    for i in range(len(position)-1):
+        screen.blit(body,position[i])
+    # 将果实画上去
+    screen.blit(food, (360, 300))
+    # 刷新画面
     pygame.display.update()
-    FPSCLOCK.tick(3)
-    
+    FK.tick(3)