save project

snake.py

@@ -11,25 +11,51 @@ FPSCLOCK=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')
 
 x,y=240,120
 position=[(180,90),(180,120),(210,120),(x,y)]
 
+settheading="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 settheading != "left":
+                settheading='right'
+                snake_head=right
+            if event.key==locals.K_LEFT and settheading != "right":
+                settheading='left'
+                snake_head=left
+            if event.key==locals.K_UP and settheading != "down":
+                settheading='up'
+                snake_head=up
+            if event.key==locals.K_DOWN and settheading != "up":
+                settheading='down'
+                snake_head=down
+    if settheading=="right":
         x+=30
+    elif settheading=="left":
+        x-=30
+    elif settheading=="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])