save project

snake.py

@@ -10,22 +10,43 @@ screen = pygame.display.set_mode((660, 480))
 # 背景
 background = pygame.image.load('bg.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')
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
 x,y = 240,120
 pos = [(180,60),(180,90),(180,120),(210,120),(x,y)]
 
 clock = pygame.time.Clock()
+heading = 'r'
+snake_head_img = 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.type == locals.K_RIGHT and heading != 'l':
+                heading = 'r'
+                snake_head_img = right
+            elif event.type == locals.K_LEFT and heading != 'r':
+                heading = 'l'
+                snake_head_img = left
+            elif event.type == locals.K_UP and heading != 'd':
+                heading = 'u'
+                snake_head_img = up
+            elif event.type == locals.K_DOWN and heading != 'u':
+                heading = 'd'
+                snake_head_img = down
+
+
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
-    screen.blit(right,pos[-1])
+    screen.blit(snake_head_img,pos[-1])
     # 将贪吃蛇的身体画上去
     for i in range(len(pos)-1):
         screen.blit(body,pos[i])
@@ -33,7 +54,14 @@ while True:
     screen.blit(food, (360, 300))
     
     # 刷新画面
-    x += 30
+    if heading == 'r':
+        x += 30
+    if heading == 'l':
+        x -= 30
+    if heading == 'u':
+        y -= 30
+    if heading == 'd':
+        y += 30
     pos.append((x,y))
     pos.pop(0)