save project

snake.py

@@ -10,22 +10,47 @@ screen = pygame.display.set_mode((660, 480))
 FPSLOCK=pygame.time.Clock()
 # 背景
 background = pygame.image.load('bg.png')
-right = pygame.image.load('right.png')
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
+right = pygame.image.load('right.png')
+left = pygame.image.load('left.png')
+up = pygame.image.load('up.png')
+down = pygame.image.load('down.png')
 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()
+        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
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
-    x+=30
     position.append((x,y))
     position.pop(0)
-    screen.blit(right, position[-1])
+    screen.blit(snake_head, position[-1])
     for i in range(len(position)-1):
         screen.blit(body,position[i])
     # 将贪吃蛇的身体画上去
@@ -35,6 +60,5 @@ while True:
     # 将果实画上去
     screen.blit(food, (360, 300))
     # 刷新画面
-    
     FPSLOCK.tick(3)
     pygame.display.update()
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