适用于Python的Turtle模块-圆圈故障？

问题描述

我一直在尝试使用Python的Turtle模块创建一个零交叉游戏。我一直遇到的问题是，每次程序运行时，乌龟都不会在相同的位置绘制出白色的圆圈，这些白色的圆圈用来掩盖标记每个网格正方形的数字（这样就可以在其中写下零和十字）-它们在相似的位置，但略有跳动，因此不再掩盖下面的字母。这是我的代码中创建圆圈的部分：

def position_1(naught_cross): #each function contains the code to write its respective number in the correct place on the grid
    if naught_cross != "1": #i.e. when a 'o' or 'x' is submitted as an argument
        circle_drawer(-125,140) #calls function to draw circle in square before text is typed so text can be cleared when naughts/crosses are inputted in the grid sqaures
    t.penup()
    t.setpos(-115,130) #sets the position of the turltle head in pixels
    font = ("Arial",30,"normal")
    t.write(naught_cross,font=(font)) #having the variable 'naught_cross' enables it to change between the grid number and a naught/cross
def position_2(naught_cross):
    if naught_cross != "2":
        circle_drawer(-15,140) #calls function to draw box in square before text is typed so text can be cleared when naughts/crosses are inputted in the grid sqaures
    t.penup()
    t.setpos(-5,font=(font))
def position_3(naught_cross):
    if naught_cross != "3":
        circle_drawer(85,140) #calls function to draw box in square before text is typed so text can be cleared when naughts/crosses are inputted in the grid sqaures
    t.penup()
    t.setpos(95,font=(font))
def position_4(naught_cross):
    if naught_cross != "4":
        circle_drawer(-125,40) #calls function to draw box in square before text is typed so text can be cleared when naughts/crosses are inputted in the grid sqaures
    t.penup()
    t.setpos(-115,30) #sets the position of the turltle head in pixels
    font = ("Arial",font=(font))
def position_5(naught_cross):
    if naught_cross != "5":
        circle_drawer(-15,40)
    t.penup()
    t.setpos(-5,font=(font))
def position_6(naught_cross):
    if naught_cross != "6":
        circle_drawer(85,40)
    t.penup()
    t.setpos(95,font=(font))
def position_7(naught_cross):
    if naught_cross != "7": 
        circle_drawer(-125,-60) #calls function to draw box in square before text is typed so text can be cleared when naughts/crosses are inputted in the grid sqaures
    t.penup()
    t.setpos(-115,-70) #sets the position of the turltle head in pixels
    font = ("Arial",font=(font))
def position_8(naught_cross):
    if naught_cross != "8":
        circle_drawer(-15,-60) #calls function to draw box in square before text is typed so text can be cleared when naughts/crosses are inputted in the grid sqaures
    t.penup()
    t.setpos(-5,font=(font))
def position_9(naught_cross):
    if naught_cross != "9":
        circle_drawer(85,-60) #calls function to draw box in square before text is typed so text can be cleared when naughts/crosses are inputted in the grid sqaures
    t.penup()
    t.setpos(95,font=(font))


def circle_drawer(x,y): #paramters are x,y coordinates (contain actual coords in arguments when called) if grid in which white box must be drawn
    t.ht() #hides turtle
    t.lt(90)
    t.setpos(x,y) #sets turtle in poosition according to values in arguments 
    t.fillcolor("white") #sets the colour as white
    t.begin_fill() #fills circle
    t.circle(30) #draws a circle of radius 30
    t.end_fill() #ends filling circle

有人有解决这个问题的想法吗？

解决方法

没有足够的代码来给出明确的答案，但是我的猜测是问题出在circle_drawer()函数的这一行：

t.lt(90)

首先，它是可疑的，因为这是唯一未注释的行！其次，我们真的不知道在此调用之前或之后，乌龟是如何定位的，因为它取决于在此函数调用之前乌龟的旋转角度。我的信念是您真的想要：

t.setheading(0)

或除0（零）以外的其他角度。在进行绘图和书写之前，这会将乌龟设置为一致的 known 标题。