matplotlib legend setting example

matplotlib_legend_settings.py

import ctypes
import tkinter
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2Tk
from tkinter import ttk

legend_position_dict = {
    0:"best",
    1:"upper right",
    2:"upper left",
    3:"lower left",
    4:"lower right",
    5:"right",
    6:"center left",
    7:"center right",
    8:"lower center",
    9:"upper center",
    10:"center",
}

class LegendSetting(tkinter.Toplevel):
    def __init__(self, root, legend):
        self.legend = legend
        self.fig = legend.parent.get_figure()
        super().__init__(root)

        #legend on/off chechbutton
        self.on_off_var = tkinter.BooleanVar(self, value=True)
        on_off = tkinter.Checkbutton(
            self,
            text="show legend",
            variable=self.on_off_var,
            command=self.update_legend_setting
        )
        on_off.pack()

        #position setting combobox
        self.position_var = tkinter.StringVar(self)
        position_select_box = ttk.Combobox(
            self,
            state="readonly",
            values=list(legend_position_dict.values()),
            textvariable=self.position_var,
        )
        position_select_box.set("best")
        position_select_box.bind('<<ComboboxSelected>>', self.combobox_selected)
        position_select_box.pack()

        #draggable on/off chechbutton
        self.draggable_var = tkinter.BooleanVar(self, value=False)
        draggable = tkinter.Checkbutton(
            self,
            text="draggable",
            variable=self.draggable_var,
            command=self.update_legend_setting,
        )
        draggable.pack()

    def update_legend_setting(self):
        self.legend.set_visible(self.on_off_var.get())
        self.legend.set_loc(self.position_var.get())
        self.legend.set_draggable(self.draggable_var.get())
        self.fig.canvas.draw()

    def combobox_selected(self, event):
        self.on_off_var.set(True)
        self.draggable_var.set(False)
        self.update_legend_setting()


if __name__ == "__main__":
    ctypes.windll.shcore.SetProcessDpiAwareness(1)
    root = tkinter.Tk()

    #create graph objects
    x = np.linspace(0, 10, 500)
    fig, ax = plt.subplots()
    ax.plot(x, np.sin(x), label="x")
    ax.plot(x, np.sin(2*x), label="2x")
    ax.plot(x, np.sin(3*x), label="3x")

    #set title, legend
    fig.suptitle("legend setting example")
    legend = ax.legend()
    legend_setting_window = LegendSetting(root, legend)

    #set graph to tkinter window
    canvas = FigureCanvasTkAgg(fig, root)
    toolbar = NavigationToolbar2Tk(canvas, root)
    canvas.get_tk_widget().pack()           #show graph
    plt.tight_layout()
    plt.close()

    root.mainloop()