Python小游戏实现实例之接苹果

"""
   接苹果小游戏，本程序实现手动控制帧率
   Sprite类是继承自Turtle的一个类，所以归于海龟画图。
"""

from sprites import *
 
screen = Screen()                        # 新建屏幕
screen.tracer(0,0)                       # 追踪命令                  
screen.setup(800,500)

screen.bgpic('greenforest.png')
 
basket = Sprite('basket.png')

counter = 0
fps = 60
start_time = time.perf_counter()

while 1:
    if random.randint(1,10)==1:          # 产生一个苹果
        x = random.randint(-380,380)
        y = 400
        a = Sprite('apple.png',pos=(x,y),tag='apple')        
        a.scale(max(0.5,random.random()))

for apple in screen.turtles():
    if apple.get_tag()!= 'apple':continue      
    apple.move(0,-5)                   # 在水平和垂直方向移动
    if apple.collide(basket):
        apple.remove()                 # 移除苹果
        counter += 1                   # 接到苹果了进行统计
        continue
    if apple.ycor() < -250:apple.remove()

mx,my = mousepos()                    # 获取鼠标指针的x,y坐标
basket.Goto(mx,-180)    
screen.update()
screen.title('大海老师接苹果游戏，已接到：' + str(counter) + '个苹果')
 
# 以下代码实现手动控制帧率为60
end_time = time.perf_counter()
if end_time - start_time < 1/fps:
    time.sleep(1/fps - (end_time - start_time))
start_time = time.perf_counter()