从窗口中删除 matplotlib 绘图/tkinter 画布

Question

I was wondering how you can completely delete a plot from a tkinter window.

Assuming i would have a tkinter project like the following:

import tkinter as tk
from pandas import DataFrame
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg

data1 = {'Country': ['US','CA','GER','UK','FR'],
         'GDP_Per_Capita': [45000,42000,52000,49000,47000]
        }
df1 = DataFrame(data1,columns=['Country','GDP_Per_Capita'])


root= tk.Tk() 
  
figure1 = plt.Figure(figsize=(6,5), dpi=100)
ax1 = figure1.add_subplot(111)
bar1 = FigureCanvasTkAgg(figure1, root)
bar1.get_tk_widget().pack(side=tk.LEFT, fill=tk.BOTH)
df1 = df1[['Country','GDP_Per_Capita']].groupby('Country').sum()
df1.plot(kind='bar', legend=True, ax=ax1)
ax1.set_title('Country Vs. GDP Per Capita')

def close_plot():
    plt.close(figure1)


button_delete = Button(root, text='Delete', command = lambda: close_plot()).place(height=30, width = 100, rely=0.02, relx = 0.4)


root.mainloop()

I veen trying to use matplotlib.pyplot.close within a button but it doens't seem to work. Anyone have a clue how to get rid of this plot.

Thank you very much!

Answer 1

Your figure is embedded in a tkinter widget. You need to keep a reference to that widget, and use its methods to add/remove it from the tkinter window: Here we use pack_forget() : the widget is removed from the window, but still exists, and could be reused later.

import tkinter as tk
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg


def remove_plot():
    w.pack_forget()   # here you remove the widget from the tk window
    # w.destroy()


if __name__ == '__main__':

    # data
    x, y = [1, 2, 3, 4], [1, 4, 9, 16]

    # matplotlib stuff
    figure1 = plt.Figure(figsize=(6, 5), dpi=100)
    ax1 = figure1.add_subplot(111)
    ax1.plot(x, y)
    ax1.set_title('Country Vs. GDP Per Capita')

    # tkinter stuff
    root = tk.Tk()

    bar1 = FigureCanvasTkAgg(figure1, root)
    w = bar1.get_tk_widget()
    w.pack(side=tk.LEFT, fill=tk.BOTH)   # here you insert the widget in the tk window
    button_delete = tk.Button(root, text='Remove Plot', command=remove_plot)
    button_delete.place(height=30, width=100, rely=0.02, relx=0.4)   # place is an odd choice of geometry manager, you will have to adjust it every time the title changes

    root.mainloop()

Alternatively, if you don't need that figure any longer, you could use w.destroy (commented line) to destroy the widget.