save project

snake.py

@@ -13,22 +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   #
+        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
+
     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, (x, y))  #
+    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])