Python海龟画图画板2020617版

"""
   Python海龟画图画版2020617版
"""
import turtle

screen = turtle.getscreen()
screen.setup(480,360)
screen.bgcolor('black')
screen.delay(0)

turtle.color('magenta')
turtle.speed(0)
turtle.penup()
turtle.ht()

last_pos = None

def begindraw(event):
    global last_pos
    x = event.x - 240                   # 转换成海龟坐标系中的x坐标
    y = 180 - event.y                   # 转换成海龟坐标系中的y坐标
    if last_pos is not None:
        turtle.goto(last_pos)
        turtle.pendown()
        turtle.goto(x,y)

def enddraw(event):
    turtle.penup()
    last_pos = None
    
pass                                  # 这里省略了若干代码......
screen.mainloop()

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