def __init__(
                self,
                screen_width = 800,
                screen_height = 600,
                background_color = "black",
                title = "Simple Game Library by /u/wynand1004 AKA @TokyoEdTech",
                splash_time = 3):

        # Setup using Turtle module methods
        turtle.setup(width=screen_width, height=screen_height)
        turtle.bgcolor(background_color)
        turtle.title(title)
        turtle.tracer(0) # Stop automatic screen refresh
        turtle.listen() # Listen for keyboard input
        turtle.hideturtle() # Hides default turtle
        turtle.penup() # Puts pen up for defaut turtle
        turtle.setundobuffer(0) # Do not keep turtle history in memory
        turtle.onscreenclick(self.click)

        # Game Attributes
        self.SCREEN_WIDTH = screen_width
        self.SCREEN_HEIGHT = screen_height
        self.DATAFILE = "game.dat"
        self.SPLASHFILE = "splash.gif" # Must be in the same folder as game file

        self.fps = 30.0 # Lower this on slower computers or with large number of sprites
        self.title = title
        self.gravity = 0
        self.state = "showsplash"
        self.splash_time = splash_time

        self.time = time.time()

        # Clear the terminal and print the game title
        self.clear_terminal_screen()
        print (self.title)

        # Show splash
        self.show_splash(self.splash_time)

    # Pop ups 

def __init__(
                self,
                screen_width = 800,
                screen_height = 600,
                background_color = "black",
                title = "Simple Game Library by /u/wynand1004 AKA @TokyoEdTech",
                splash_time = 3):

        # Setup using Turtle module methods
        turtle.setup(width=screen_width, height=screen_height)
        turtle.bgcolor(background_color)
        turtle.title(title)
        turtle.tracer(0) # Stop automatic screen refresh
        turtle.listen() # Listen for keyboard input
        turtle.hideturtle() # Hides default turtle
        turtle.penup() # Puts pen up for defaut turtle
        turtle.setundobuffer(0) # Do not keep turtle history in memory
        turtle.onscreenclick(self.click)

        # Game Attributes
        self.FPS = 30.0 # Lower this on slower computers or with large number of sprites
        self.SCREEN_WIDTH = screen_width
        self.SCREEN_HEIGHT = screen_height
        self.DATAFILE = "game.dat"
        self.SPLASHFILE = "splash.gif" # Must be in the same folder as game file

        self.title = title
        self.gravity = 0
        self.state = "showsplash"
        self.splash_time = splash_time

        self.time = time.time()

        # Clear the terminal and print the game title
        self.clear_terminal_screen()
        print (self.title)

        # Show splash
        self.show_splash(self.splash_time)

    # Pop ups 

def __init__(
                self,
                screen_width = 800,
                screen_height = 600,
                background_color = "black",
                title = "Simple Game Library by /u/wynand1004 AKA @TokyoEdTech",
                splash_time = 3):

        # Setup using Turtle module methods
        turtle.setup(width=screen_width, height=screen_height)
        turtle.bgcolor(background_color)
        turtle.title(title)
        turtle.tracer(0) # Stop automatic screen refresh
        turtle.listen() # Listen for keyboard input
        turtle.hideturtle() # Hides default turtle
        turtle.penup() # Puts pen up for defaut turtle
        turtle.setundobuffer(0) # Do not keep turtle history in memory
        turtle.onscreenclick(self.click)

        # Game Attributes
        self.FPS = 30.0 # Lower this on slower computers or with large number of sprites
        self.SCREEN_WIDTH = screen_width
        self.SCREEN_HEIGHT = screen_height
        self.DATAFILE = "game.dat"
        self.SPLASHFILE = "splash.gif" # Must be in the same folder as game file

        self.title = title
        self.gravity = 0
        self.state = "showsplash"
        self.splash_time = splash_time

        self.time = time.time()

        # Clear the terminal and print the game title
        self.clear_terminal_screen()
        print (self.title)

        # Show splash
        self.show_splash(self.splash_time)

    # Pop ups 

def on_forward():
    val = t.textinput('Forward', "How much: ")
    if val:
        try:
            val = int(val)
            t.forward(val)
        except ValueError:
            messagebox.showinfo('Error', 'Wrong value')
    t.listen() 

def on_backward():
    val = t.textinput('Backward', "How much: ")
    if val:
        try:
            val = int(val)
            t.backward(val)
        except ValueError:
            messagebox.showinfo('Error', 'Wrong value')
    t.listen() 

def on_left():
    val = t.textinput('Left', "How much: ")
    if val:
        try:
            val = int(val)
            t.left(val)
        except ValueError:
            messagebox.showinfo('Error', 'Wrong value')
    t.listen() 

def on_right():
    val = t.textinput('Right', "How much: ")
    if val:
        try:
            val = int(val)
            t.right(val)
        except ValueError:
            messagebox.showinfo('Error', 'Wrong value')
    t.listen() 

def main():
    # use sys.argv if needed
    print('genterating spirograph...')
    # create parser
    descStr ="""This program draws spirographs using the Turtle module. 
    When run with no arguments, this program draws random spirographs.
    
    Terminology:
    R: radius of outer circle.
    r: radius of inner circle.
    l: ratio of hole distance to r."""
    parser = argparse.ArgumentParser(description=descStr) # 创建参数解析器对象

    parser.add_argument('--sparams',nargs=3,dest='sparams',required=False,
                        help="The three arguments in sparams:R,r,l.") # 向解析器添加可选参数

    # parse args
    args=parser.parse_args() # 调用函数进行实际的解析

    # set to 80% screen width
    turtle.setup(width=0.8)

    # set cursor shape
    turtle.shape('turtle')

    # set title
    turtle.title("Spirographs!")
    # add key handler for saving image
    turtle.onkey(saveDrawing,"s")
    # start listening
    turtle.listen()

    # hide main turtle cursor
    turtle.hideturtle()

    # checks args and draw # 首先检查是否有参数赋给--sparams.如果有，就从字符串中提取他们，用“列表解析”将他们转换成浮点数
    if args.sparams:
        params=[float(x) for x in args.sparams]
        # draw spirograph with given parameters
        # black by default
        col=(0.0,0.0,0.0)
        spiro=Spiro(0,0,col,*params)
        spiro.draw()

    else:
        # creat animator object
        spiroAnim=SpiroAnimator(4)
        # add key handler to toggle turtle cursor
        turtle.onkey(spiroAnim.toggleTurtles,"t")
        # add key handler to toggle turtle cursor
        turtle.onkey(spiroAnim.restart,"space")

    # start turtle main loop

        turtle.mainloop()


# call main