Turtle 中的按键事件导致其他按键事件停止工作

如何解决Turtle 中的按键事件导致其他按键事件停止工作

我正在尝试使用 Turtle 制作一个非常基本的 MS-Paint 版本。我有几个键和鼠标事件，但一个键事件，即turtle.width 的turtle.numinput()，在我为我的笔宽度键入所需的整数后导致我的其他键事件停止工作。鼠标事件继续工作。

当海龟窗口打开时，首先询问turtle.numinput()，但之后其他关键事件工作正常。在我按下所需的键更改我的笔宽之后，其他键事件停止工作。

我尝试稍微更改序列，甚至将代码的宽度部分复制到另一个基于 Turtle 的 Python 文件中进行检查。我在那里也遇到了同样的问题。

我不知道是什么原因造成的，非常感谢您的帮助

import turtle,random

wn = turtle.Screen()
wn.screensize(600,600)

paint = turtle.Turtle('turtle')
colors = ['Red','Yellow','Green','Blue']
paint.width(turtle.numinput('width','Type line size (in numbers): '))
paint.speed(0)

# Arrow-Keys control function
def up():
    paint.setheading(90)
    paint.forward(100)

def down():
    paint.setheading(270)
    paint.forward(100)

def left():
    paint.setheading(180)
    paint.forward(100)

def right():
    paint.setheading(0)
    paint.forward(100)

# Color change
def colorChange():
    paint.color(random.choice(colors))

# Size change
def size():
    paint.width(turtle.numinput('width','Type line size (in numbers): '))

# Mouse Control (Clear + Drag) function
def clearScreen(x,y):
    paint.clear()

def dragging(x,y):
    paint.ondrag(None)
    paint.setheading(paint.towards(x,y))
    paint.goto(x,y)
    paint.ondrag(dragging)

# Shapes with random size
def square():
    for i in range(4):
        paint.forward(50)
        paint.left(90)

def circle():
    paint.circle(random.randrange(50,100))

def rectangle():
    for i in range(2):
        paint.forward(50)
        paint.left(90)
        paint.forward(100)
        paint.left(90)

turtle.listen()

# Key-events

turtle.onkey(up,'Up')
turtle.onkey(down,'Down')
turtle.onkey(left,'Left')
turtle.onkey(right,'Right')

turtle.onkey(size,'q')

turtle.onkey(colorChange,'c')

# Mouse-events
turtle.onscreenclick(clearScreen,3)
paint.ondrag(dragging)

# Shape-events
turtle.onkey(square,'s')
turtle.onkey(circle,'o')
turtle.onkey(rectangle,'r')

turtle.mainloop()

解决方法

您可能想用普通的 turtle.numinput() 替换 input()，它从终端而不是从实际模块中获取输入，这样所有关键操作都可以正常进行

调用 numinput()（和 textinput()）会撤消 listen() 所做的事情，因为弹出输入窗口必须成为活动侦听器。解决方法是在每次 listen()（和 numinput()）调用后重做 textinput() 调用。

以下是我通过此修复程序和一些样式调整对您的代码进行的返工：

from turtle import Screen,Turtle
from random import choice,randrange

COLORS = ['Red','Yellow','Green','Blue']

# Arrow-Keys control function
def up():
    paint.setheading(90)
    paint.forward(100)

def down():
    paint.setheading(270)
    paint.forward(100)

def left():
    paint.setheading(180)
    paint.forward(100)

def right():
    paint.setheading(0)
    paint.forward(100)

# Color change
def colorChange():
    paint.color(choice(COLORS))

# Size change
def size():
    paint.width(screen.numinput("width","Type line size (in numbers):"))
    screen.listen()

# Mouse Control (Clear + Drag) function
def clearScreen(x,y):
    paint.clear()

def dragging(x,y):
    paint.ondrag(None)
    paint.setheading(paint.towards(x,y))
    paint.goto(x,y)
    paint.ondrag(dragging)

# Shapes with random size
def square():
    for _ in range(4):
        paint.forward(50)
        paint.left(90)

def circle():
    paint.circle(randrange(50,100))

def rectangle():
    for _ in range(2):
        paint.forward(50)
        paint.left(90)
        paint.forward(100)
        paint.left(90)

screen = Screen()
screen.screensize(600,600)

paint = Turtle('turtle')
paint.width(screen.numinput("width","Type line size (in numbers):"))
paint.speed('fastest')

# Key-events

screen.onkey(up,'Up')
screen.onkey(down,'Down')
screen.onkey(left,'Left')
screen.onkey(right,'Right')

screen.onkey(size,'q')
screen.onkey(colorChange,'c')

# Shape-events
screen.onkey(square,'s')
screen.onkey(circle,'o')
screen.onkey(rectangle,'r')

screen.listen()

# Mouse-events
screen.onclick(clearScreen,3)
paint.ondrag(dragging)

screen.mainloop()