通过在Python中删除旧的条形图来替换新的条形图

Question

我是Python的新手。我希望plt.close('all')会在单击名为 CHANGE DATA 的按钮时删除旧图形。而是将新图放置在旧图旁边（左侧）。额外的点击会显示更多图表，但是旧的图表永远不会被删除。

我做错了吗？或者这是一起使用 tkinter 和 matplotlib 的限制吗？

import tkinter as tk
from tkinter import Button
import numpy as np
import matplotlib
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
import matplotlib.pyplot as plt

matplotlib.use('TkAgg')

def displ_graf(datalst):
    ff = plt.figure(figsize=(5.6,4), dpi=100)
    xx = ff.add_subplot(1,1,1)
    nn = np.arange(len(datalst))
    bb = xx.barh(nn, datalst, 0.8)
    ff.tight_layout
    cc = FigureCanvasTkAgg(ff, master=ww)
    cc.draw()
    cc.get_tk_widget().pack(side=tk.RIGHT)

def graf2():
    plt.close('all')
    data2 = [64, 58, 12, 91, 49, 32, 70, 23, 35]
    displ_graf(data2)

ww = tk.Tk()
ww.geometry('700x400')
ww.state('zoomed')
butt3 = Button(ww,text=' CHANGE DATA ',command=graf2, height=1,width=15)
butt3.place(x=790, y=100)

data1 = [31, 41, 59, 26, 53, 58, 97, 93, 23]
displ_graf(data1)
ww.mainloop()

单击按钮之前，左侧图像显示初始屏幕，单击按钮上之后，右侧图像显示屏幕：

Answer 1

您可以使用cc.get_tk_widget().destroy()来做到这一点。但是您的代码似乎有点笨拙。所以也许看看这个example

仅举一个可行的例子：

import tkinter as tk
from tkinter import Button
import numpy as np
import matplotlib
matplotlib.use('TkAgg')

from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
import matplotlib.pyplot as plt



def displ_graf(datalst):
    ff = plt.figure(figsize=(5.6,4), dpi=100)
    xx = ff.add_subplot(1,1,1)
    nn = np.arange(len(datalst))
    bb = xx.barh(nn, datalst, 0.8)
    ff.tight_layout
    cc = FigureCanvasTkAgg(ff, master=ww)
    cc.draw()
    cc.get_tk_widget().pack(side=tk.RIGHT)
    return cc

def graf2():    
    data2 = [64, 58, 12, 91, 49, 32, 70, 23, 35]
    displ_graf(data2)

def destroy():
    canv.get_tk_widget().destroy()

ww = tk.Tk()
ww.geometry('700x400')
ww.state('normal')
butt3 = Button(ww,text=' CHANGE DATA ',command=graf2, height=1,width=15)
butt4 = Button(ww,text=' destroy ',command=destroy, height=1,width=15)
butt3.place(x=790, y=100)
butt4.place(x=500, y=100)

data1 = [31, 41, 59, 26, 53, 58, 97, 93, 23]
canv = displ_graf(data1)
ww.mainloop()

但是这里的问题是每次您运行displ_graph

时都会创建一个新的cc实例。