auto save

snake.py

@@ -15,12 +15,30 @@ body = pygame.image.load('body.png')
 
 x,y=240,120
 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()
+        if event.type==locals.KEYDOWN:
+            if event.key==locals.K_RIGHT and setheading!="left":
+                setheading='right'
+            if event.key==locals.K_LEFT and setheading!="right":
+                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
+    else:
+        y+=30        
+    
     position.append((x,y))
     position.pop(0)
     # 将背景图画上去