def init_pen():
    '''
    初始化画笔的一些属性
    '''
    t.pensize(4)  # 设置画笔的大小
    t.colormode(255)  # 设置GBK颜色范围为0-255
    t.color((255, 155, 192), "pink")  # 设置画笔颜色和填充颜色(pink)
    t.setup(900, 500)  # 设置主窗口的大小为900*500
    t.speed(10)  # 设置画笔速度为10 

def setup_window():
    # Set up the window
    turtle.title('Circles in My Mind')
    turtle.setup(WIDTH, HEIGHT, 0, 0)
    turtle.colormode(255)  # Indicates RGB numbers will be in the range 0 to 255
    turtle.hideturtle()
    # Batch drawing to the screen for faster rendering
    turtle.tracer(2000)

    # Speed up drawing process
    turtle.speed(10)
    turtle.penup()