新图形未显示在 Canvas PySimpleGUI 和 Matplotlib 上

如何解决新图形未显示在 Canvas PySimpleGUI 和 Matplotlib 上

我需要根据两个按钮重置图表。按下按钮 1 时显示第一个图形，按下按钮 2 后不显示第二个图形。

第一个图形显示正确但需要清除画布

代码如下：

import matplotlib.pyplot as plt
import matplotlib
import numpy
import numpy as np
import PySimpleGUI as psg
from matplotlib.backends.backend_tkagg import figureCanvasTkAgg
matplotlib.use('TkAgg')

def make_graph_and_put_on_canvas(x,y,xlabel,ylabel,graph_title,canvas):

    figure,ax=plt.subplots()
    ax.plot(x,y)
    ax.set(xlabel=xlabel,ylabel=ylabel,title=graph_title)
    ax.grid()

    figure_canvas_agg = figureCanvasTkAgg(figure,canvas)
    figure_canvas_agg.draw()
    figure_canvas_agg.get_tk_widget().pack(side='top',fill='both',expand=1)

    return figure_canvas_agg

if __name__ == '__main__':
   layout = [[psg.B("Button1"),psg.B("Button2")],[psg.Canvas(key="canvas")]]
   Graph = psg.Window(title="Graph",layout=layout,size=(500,500))
   while (True):
        event,Value = Graph.read()
        if event == psg.WINDOW_CLOSED:
            Graph.close()
            break
        if event=="Button1":
            #Make the first graph for y=2x
            x=[0,1,2,3]
            y=[0,4,6]
            make_graph_and_put_on_canvas(x,"x","y","title",Graph["canvas"].TKCanvas)

        if event=="Button2":
            # Make the first graph for y=3x
            x = [0,3]
            y = [0,3,6,9]
            make_graph_and_put_on_canvas(x,Graph["canvas"].TKCanvas)

解决方法

FigureCanvasTkAgg(figure,canvas) 将在 Graph["canvas"].TKCanvas 中创建一个新画布。 使用选项 side='top' 当 pack 时，您将获得从 Graph["canvas"].TKCanvas 的顶部到底部的新画布。第二个 Button 确实制作了第二个图表，但位于窗口底部，对于窗口中的 size = (500,500) 不可见。

• 如果你想在同一图上显示新图，请调用以下代码一次，

figure_canvas_agg = FigureCanvasTkAgg(figure,canvas)
figure_canvas_agg.get_tk_widget().pack(side='top',fill='both',expand=1)

• 清除图形或轴

clf()    # clear figure
cla()    # clear axis

• 在完成图形上的所有绘图后更新画布上的图形

figure_canvas_agg.draw()

以下代码只是工作，没有优化。

import matplotlib.pyplot as plt
import matplotlib
import numpy
import numpy as np
import PySimpleGUI as psg
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg

matplotlib.use('TkAgg')

def make_graph_and_put_on_canvas(x,y,xlabel,ylabel,graph_title,canvas):

    ax.cla()
    ax.plot(x,y)
    ax.set(xlabel=xlabel,ylabel=ylabel,title=graph_title)
    ax.grid()
    figure_canvas_agg.draw()

    return figure_canvas_agg

if __name__ == '__main__':

    layout = [[psg.B("Button1"),psg.B("Button2")],[psg.Canvas(key="canvas")]]
    Graph = psg.Window(title="Graph",layout=layout,size=(500,500),finalize=True)
    figure,ax = plt.subplots()
    canvas = Graph["canvas"].Widget
    figure_canvas_agg = FigureCanvasTkAgg(figure,canvas)
    figure_canvas_agg.get_tk_widget().pack(side='top',expand=1)

    while (True):

        event,Value = Graph.read()

        if event == psg.WINDOW_CLOSED:
            break

        if event=="Button1":
            # Make the first graph for y=2x
            x=[0,1,2,3]
            y=[0,4,6]
            make_graph_and_put_on_canvas(x,"x","y","title1",canvas)

        if event=="Button2":
            # Make the first graph for y=3x
            x = [0,3]
            y = [0,3,6,9]
            make_graph_and_put_on_canvas(x,"title2",canvas)

    Graph.close()