auto save

snake.py

@@ -6,28 +6,68 @@ pygame.init()
 
 # 创建一个窗口
 screen = pygame.display.set_mode((660, 480))
+FPSCLOCK = pygame.time.Clock()  # pygame时钟，控制游戏速度（帧数）
 
 # 背景
 background = pygame.image.load('bg.png')
-right = pygame.image.load('right.png')
+right = pygame.image.load('right.png')  # 头朝右
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
+left = pygame.image.load('left.png')  # 朝左
+up = pygame.image.load('up.png')      # 朝上
+down = pygame.image.load('down.png')  # 朝下
+
+x, y = 240, 120  # 初始化贪吃蛇头的坐标设置x，y为240，120
+# 创建列表储存贪吃蛇的初始坐标三段身体以及蛇头坐标
+position = [(180, 90), (180, 120), (210, 120), (x, y)]
+
+setheading = "right"  # 新建变量setheading记录贪吃蛇朝向并设为朝右"right"
+snake_head = right  # 新建变量snake_head用来设置贪吃蛇朝向造型，初始造型设为朝右
 
 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判断键盘是否被按下
+            # if判断四个方向建是否被按下以及判断贪吃蛇朝向是否相反
+            # 就将方向设为按下方向键朝向
+            # 将造型设置为朝向造型
+            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
+    # 设置贪吃蛇的头部坐标
+    if setheading == "right":  # if判断朝向向右
+        x += 30                # x坐标增加一格
+    elif setheading == "left": # 继续判断朝向向左
+        x -= 30                # x坐标减少一格
+    elif setheading == "up":   # 继续判断朝向向上
+        y -= 30                # y坐标减少一格
+    else:                      # 否则
+        y += 30                # y坐标增加一格
+    # 将贪吃蛇头的新坐标追加进列表
+    position.append((x, y))
+    position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
-    screen.blit(right, (x, y))
+    screen.blit(snake_head, position[-1]) # 将列表的第一个元素删除作为蛇头的坐标
     # 将贪吃蛇的身体画上去
-    screen.blit(body, (210, 120))
-    screen.blit(body, (180, 120))
-    screen.blit(body, (180, 90))
+    # for循环取出身体坐标len()获取列表长度-1，得到的值通过range()函数生成列表下标
+    for i in range(len(position)-1):
+        screen.blit(body, position[i])  # 取出列表里所有身体坐标进行渲染
+
     # 将果实画上去
     screen.blit(food, (360, 300))
     # 刷新画面
-    pygame.display.update()
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+    pygame.display.update()
+    FPSCLOCK.tick(3)  # 用计时器的tick()方法设置帧数为3
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