save project

snake.py

@@ -12,20 +12,45 @@ 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
+snakehead='right'
+snake=right
 chang=[(180,90),(180,120),(210,120),(x,y)]
 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 snakehead!='left':
+                snakehead='right'
+                snake=right
+            if event.key==locals.K_LEFT and snakehead!='right':
+                snakehead='left'
+                snake=left
+            if event.key==locals.K_UP and snakehead!='down':
+                snakehead='up'
+                snake=up
+            if event.key==locals.K_DOWN and snakehead!='up':
+                snakehead='down'
+                snake=down
+    if snakehead=='right':
+        x+=30
+    elif snakehead=='left':
+        x-=30
+    elif snakehead=='up':
+        y-=30
+    else:
+        y+=30
     chang.append((x,y))
     chang.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, (x, y))
     # 将贪吃蛇的身体画上去
     for i in range(len(chang)-1):
         screen.blit(body,chang[i])