save project

snake.py

 import pygame
 from pygame import locals
-
+setheading='right'
 
 # 初始化pygame，为使用硬件做准备
 pygame.init()
@@ -11,6 +11,9 @@ screen = pygame.display.set_mode((660, 480))
 # 背景
 background = pygame.image.load('bg.png')
 right = pygame.image.load('right.png')
+left = pygame.image.load('left.png')
+up = pygame.image.load('up.png')
+down = pygame.image.load('down.png')
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
 x=240
@@ -22,16 +25,33 @@ while True:
         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_UP and setheading!='down':
+                setheading='up'
+            elif event.key==locals.K_DOWN and setheading!='up':
+                setheading='down'
+            elif event.key==locals.K_LEFT and setheading!='right':
+                setheading='left'
+            elif event.key==locals.K_RIGHT and setheading!='left':
+                setheading='right'
+    if setheading=='up':
+        y-=30
+    if setheading=='down':
+        y+=30
+    if setheading=='left':
+        x-=30
+    if setheading=='right':
+        x+=30
     # 将背景图画上去
     
-    x+=30
     position.append((x,y))
     position.pop(0)
 
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
-    screen.blit(right,position[-1])
+    
     for i in range(len(position)-1):
+        screen.blit(right,position[-1])
         screen.blit(body,position[i])
     # 将贪吃蛇的身体画上去
     # 将果实画上去