save project

snake.py

@@ -13,15 +13,39 @@ 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')
 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:
             # 接收到退出事件后退出程序
             exit()
-    x +=30
+        elif 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
     position.append((x,y))
     position.pop(0)
     # 将背景图画上去