在matplotlib中水平显示单选按钮

当前尝试在PR＃13374中引入一个orientation论点；尚未完成。RadioButtons

正如我在此PR中评论的那样，另一种选择是对按钮使用散点图。下面显示了我如何想象此实现。与常规按钮相比，有两个主要增强功能：

• 单选按钮始终是圆形的，与轴的大小无关。
• 它们可以任意对准，尤其是水平对准。

这是通过在内部创建图例来实现的，该图例具有所有可用的必需选项。任何有效的参数Legend也可以用于Button。

import matplotlib.pyplot as plt
from matplotlib.widgets import AxesWidget, RadioButtons

class MyRadioButtons(RadioButtons):

    def __init__(self, ax, labels, active=0, activecolor='blue', size=49,
                 orientation="vertical", **kwargs):
        """
        Add radio buttons to an `~.axes.Axes`.
        Parameters
        ----------
        ax : `~matplotlib.axes.Axes`
            The axes to add the buttons to.
        labels : list of str
            The button labels.
        active : int
            The index of the initially selected button.
        activecolor : color
            The color of the selected button.
        size : float
            Size of the radio buttons
        orientation : str
            The orientation of the buttons: 'vertical' (default), or 'horizontal'.
        Further parameters are passed on to `Legend`.
        """
        AxesWidget.__init__(self, ax)
        self.activecolor = activecolor
        axcolor = ax.get_facecolor()
        self.value_selected = None

        ax.set_xticks([])
        ax.set_yticks([])
        ax.set_navigate(False)

        circles = []
        for i, label in enumerate(labels):
            if i == active:
                self.value_selected = label
                facecolor = activecolor
            else:
                facecolor = axcolor
            p = ax.scatter([],[], s=size, marker="o", edgecolor='black',
                           facecolor=facecolor)
            circles.append(p)
        if orientation == "horizontal":
            kwargs.update(ncol=len(labels), mode="expand")
        kwargs.setdefault("frameon", False)    
        self.box = ax.legend(circles, labels, loc="center", **kwargs)
        self.labels = self.box.texts
        self.circles = self.box.legendHandles
        for c in self.circles:
            c.set_picker(5)
        self.cnt = 0
        self.observers = {}

        self.connect_event('pick_event', self._clicked)


    def _clicked(self, event):
        if (self.ignore(event) or event.mouseevent.button != 1 or
            event.mouseevent.inaxes != self.ax):
            return
        if event.artist in self.circles:
            self.set_active(self.circles.index(event.artist))

用作

plt.subplots_adjust(left=0.2)
rax = plt.axes([0.5,0.05,0.4,0.07])
radio =  MyRadioButtons(rax ,['1','2','3'], active=0, activecolor='crimson',
                        orientation="horizontal")

plt.show()

要么

rax = plt.axes([0.2,0.5,0.25,0.1])
radio =  MyRadioButtons(rax ,["AA", "BB", "CC", "DD"], ncol=2)