save project

snake.py

@@ -13,21 +13,49 @@ 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
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
-    screen.blit(right, position[-1])
+    screen.blit(snake_head, position[-1])
     # 将贪吃蛇的身体画上去
     for i in range(len(position)-1):
         screen.blit(body,position[i])