save project

snake.py

@@ -13,16 +13,44 @@ 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"
+snack_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()
+        elif event.type == locals.KEYDOWN:
+            if event.key == locals.K_RIGHT and setheading != "left":
+                setheading = "right"
+                snack_head = right
+            if event.key == locals.K_LEFT and setheading != "right":
+                setheading = "left"
+                snack_head = left
+            if event.key == locals.K_UP and setheading != "down":
+                setheading = "up"
+                snack_head = up
+            if event.key == locals.K_DOWN and setheading != "up":
+                setheading = "down"
+                snack_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