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python - Python Turtle 键绑定只工作一次

问题描述

我试图用turtle创建一个简单的键盘绘图程序来保存你的绘图以供以后使用，但是当尝试使用键绑定来移动时，我只能移动一次。

我正在运行 Windows 10。我正在为我构建的渲染引擎编写此文件，该引擎Ren使用此文件格式来渲染形状。

这是我的代码：

import turtle
from tkinter.filedialog import *

s = turtle.Screen()
s.title("Ren Poly Editor")

t = turtle.Turtle()

fileName = askopenfilename()

with open(fileName) as file:
    rendataLayer1 = file.read().split("\n")
    rendata = []
    for i in rendataLayer1:
        if not i.startswith("#") and i:
            rendata.append(str(i.split()))

t.color("black")

for i in rendata:
    i = eval(i)

    print(i[0] + " " + i[1])

    if i[0] == "cl":
        t.color(i[1])

    elif i[0] == "fd":
        t.fd(int(i[1]))

    elif i[0] == "bk":
        t.back(int(i[1]))

    elif i[0] == "lt":
        t.lt(int(i[1]))

    elif i[0] == "rt":
        t.rt(int(i[1]))

def fd():
    distance = s.textinput("Forward", "How far?")

    t.fd(int(distance))

    with open(fileName, "a") as file:
        file.write("fd " + distance + "\n")

def bk():
    distance = s.textinput("Backward", "How far?")

    t.back(int(distance))

    with open(fileName, "a") as file:
        file.write("bk " + distance + "\n")

def lt():
    distance = s.textinput("Forward", "How much?")

    t.lt(int(distance))

    with open(fileName, "a") as file:
        file.write("lt " + distance + "\n")

def rt():
    distance = s.textinput("Forward", "How much?")

    t.rt(int(distance))

    with open(fileName, "a") as file:
        file.write("rt " + distance + "\n")


s.onkeypress(fd, "Up")
s.onkeypress(bk, "Down")
s.onkeypress(lt, "Left")
s.onkeypress(rt, "Right")
s.listen()

s.mainloop()

标签： pythonpython-3.xkey-bindingspython-turtle

解决方案

每当您textinput()在 Python turtle（或类似的numinput()）中调用该方法时，它都会撤消您的listen()调用，因为弹出的接受输入的窗口将成为侦听器。只需listen()在每次调用之后添加另一个调用textinput()，事情就会如您所愿。

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