save project

snake.py

@@ -12,13 +12,37 @@ 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')
+up = pygame.image.load('up.png')
+down = pygame.image.load('down.png')
+setheading = "right"
+snake_head = 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+=30
+        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 !="down":
+                setheading = "up"
+                snake_head = up
+            if event.key==locals.K_DOWN and setheading !="up":
+                setheading = "down"
+                snake_head = down
+    if setheading == "right" :
+        x+=30 
+    elif setheading == "left" :
+        x-=30
+    elif setheading == "up" :
+        y-=30
+    else: 
+        y+=30                                               
     pusition.append((x,y))
     pusition.pop(0)        
     # 将背景图画上去