save project

snake.py

@@ -13,23 +13,51 @@ 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()
+        elif event.type == locals.KEYDOWN:   
+            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 event.key== locals.K_LEFT and setheading!= "right":
+                setheading = "left"
+                snake_head = left
 
-    x += 30
+            if event.key == locals.K_RIGHT and setheading!= "left":
+                setheading = "right"
+                snake_head = right
+    if setheading == "right":
+        x += 30
+    elif setheading == "left":
+        x -= 30
+    elif setheading == "up":
+        y -= 30
+    elif setheading == "down":
+        y += 30
     position.append((x,y))
     position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇头画上去
-    screen.blit(right, (x,y))
+    screen.blit(snake_head, (x,y))
     # 将贪吃蛇的身体画上去
     for i in range(len(position)-1):
         screen.blit(body, position[i])