auto save

snake.py

@@ -17,13 +17,30 @@ food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
 
 position = [(180,90),(180,120),(210,120),(x,y)]
-
+setheading = "right"
 while True:
     for event in pygame.event.get():
         if event.type == locals.QUIT:
             # 接收到退出事件后退出程序
             exit()
-    x = x+30
+        if event.type ==locals.KEYDOWN:
+            if event.key == locals.K_RIGHT and setheading !="left":
+                setheading = "right"
+            if event.key == locals.K_LEFT and setheading !="left":
+                setheading = "left"
+            if event.key == locals.K_UP and setheading !="down":
+                setheading = "up"
+            if event.key == locals.K_DOWN and setheading !="up":
+                setheading = "down"    
+    if setheading == "right":      
+        x +=30
+    elif setheading == "left":
+        x -=30
+    elif setheading == "up":
+        y -=30
+    elif:
+       y += 30    
+    
     position.append((x,y))
     position.pop(0)
     # 将背景图画上去