在 Python 海龟中查找光标的当前位置 [英] Find the cursor's current position in Python turtle

问题描述

如何在Python中找到可以集成到turtle中的当前鼠标位置?如果您不使用任何非内置模块(可下载模块)，我会更喜欢任何答案将不胜感激

How can I find the current mouse position in Python that can be integrated into turtle? I would prefer if you did not use any non-builtin modules (downloadable modules) Any answers would be appreciated

推荐答案

我们可以深入到海龟的 Tk 基础来启用 '' 事件.我将函数设置/取消设置事件看起来像海龟屏幕的方法，但您可以在单一屏幕实例上调用它 turtle.Screen():

We can reach down into turtle's Tk underpinnings to enable the '<Motion>' event. I cast the function to set/unset the event to look like a method of the turtle screen but you can call it on the singular screen instance turtle.Screen():

import turtle

def onmove(self, fun, add=None):
    """
    Bind fun to mouse-motion event on screen.

    Arguments:
    self -- the singular screen instance
    fun  -- a function with two arguments, the coordinates
        of the mouse cursor on the canvas.

    Example:

    >>> onmove(turtle.Screen(), lambda x, y: print(x, y))
    >>> # Subsequently moving the cursor on the screen will
    >>> # print the cursor position to the console
    >>> screen.onmove(None)
    """

    if fun is None:
        self.cv.unbind('<Motion>')
    else:
        def eventfun(event):
            fun(self.cv.canvasx(event.x) / self.xscale, -self.cv.canvasy(event.y) / self.yscale)
        self.cv.bind('<Motion>', eventfun, add)

def goto_handler(x, y):
    onmove(turtle.Screen(), None)  # avoid overlapping events
    turtle.setheading(turtle.towards(x, y))
    turtle.goto(x, y)
    onmove(turtle.Screen(), goto_handler)

turtle.shape('turtle')

onmove(turtle.Screen(), goto_handler)

turtle.mainloop()

我的代码包括一个示例运动事件处理程序，它使海龟像追逐激光笔的猫一样跟随光标.无需单击(除了初始单击以使窗口处于活动状态.):

My code includes an example motion event handler that makes the turtle follow the cursor like a cat chasing a laser pointer. No clicks necessary (except for the initial click to make the window active.):

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