save project

snake.py

@@ -18,20 +18,42 @@ body = pygame.image.load('body.png')
 left = pygame.image.load('left.png')
 up = pygame.image.load('up.png')
 down = pygame.image.load('down.png')
-
+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()
+        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
     boby.append((x,y))
     boby.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, (x, y))
     # 将贪吃蛇的身体画上去
     for i in range(len(boby)-1):
         screen.blit(body,(boby[i]))