英文:
Can I clear a specific letter in Python turtle
问题
我正在使用Python turtle来在屏幕上绘制字母，我希望能够清除特定的字母。
我知道我可以使用.clear()，但那会清除所有使用.write()函数写入的字母。我的代码中似乎一切正常，我能够发送要更改的值（字母），但我不知道如何删除它。我知道我也可以用不同的颜色重写字母，但这对我的方案不起作用，而且会显著减慢代码（我以前尝试过）。我是否需要为屏幕上的字母数量使用多个turtle？
英文:
I am using Python turtle to draw letters across a screen, and I want to be able to clear specific ones.
I know that I can use .clear(), but that will clear all of the letters that has been written with the .write() function. Everything in my code seems to be working, and I am able to send the value (letter) that I want to change, but I don't know how I would delete it. I know that I can also write over the letter with a different color, but that wouldn't work with my scheme, and it also slows down the code a lot (I have done it before). Would I have to use multiple turtles for the number of letters on the screen?
答案1
得分: 0
排除逐字母乌龟选项，脑海中浮现的下一个想法是使用等宽字体，并在关闭tracer()（即显式更新）的情况下重写字符串：
from turtle import Screen, Turtle
FONT = ('Courier', 24, 'normal')
PHRASE = "The quick brown fox jumps over the lazy dog"
VOWELS = {'a', 'e', 'i', 'o', 'u'}
def write(x=None, y=None):
turtle.clear()
turtle.write(PHRASE, align='center', font=FONT)
screen.update()
screen.onclick(rewrite)
def rewrite(x=None, y=None):
consonants = ''.join(' ' if letter in VOWELS else letter for letter in PHRASE)
turtle.clear()
turtle.write(consonants, align='center', font=FONT)
screen.update()
screen.onclick(write)
screen = Screen()
screen.tracer(False)
turtle = Turtle()
turtle.hideturtle()
write()
screen.mainloop()
在屏幕上单击，所有元音字母将消失并重新出现。
英文:
Ruling out the turtle per letter option, the next thing that comes to mind is using a fixed width font and rewriting the string with tracer() turned off (i.e. explicit updates):
from turtle import Screen, Turtle
FONT = ('Courier', 24, 'normal')
PHRASE = "The quick brown fox jumps over the lazy dog"
VOWELS = {'a', 'e', 'i', 'o', 'u'}
def write(x=None, y=None):
turtle.clear()
turtle.write(PHRASE, align='center', font=FONT)
screen.update()
screen.onclick(rewrite)
def rewrite(x=None, y=None):
consonants = ''.join(' ' if letter in VOWELS else letter for letter in PHRASE)
turtle.clear()
turtle.write(consonants, align='center', font=FONT)
screen.update()
screen.onclick(write)
screen = Screen()
screen.tracer(False)
turtle = Turtle()
turtle.hideturtle()
write()
screen.mainloop()
Click on the screen and all the vowels will disappear and reappear.
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