Python：在 tkinter GUI 中包含的图形上使用Figure.set_size_inches 不会更新显示

Question

我正在尝试将 pyplot Figure 对象嵌入到 tkinter GUI 中，然后通过调用

set_size_inches()

方法来更改其大小。

下面提供了一个最小（非）工作示例。有趣的是，图形和画布尺寸的调试打印表明，调整大小确实有效。但是，GUI 中的可见大小保持不变。因此，我认为问题在于调整大小后更新相应的小部件和/或 GUI，但我找不到任何解决方案来将图形的显示更改为其新大小。

import tkinter as tk
from tkinter import Frame

from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg


class Gui(tk.Tk):

    def __init__(self):

        # initialize tkinter
        super().__init__()

        # enable fullscreen mode
        self.state('zoomed')

        # create frame
        graph_frame = Frame(self)

        # create graph
        fig = Figure(figsize=(2, 4), frameon=False, tight_layout=True)
        ax = fig.add_subplot(111)
        canvas = FigureCanvasTkAgg(fig, master=graph_frame)

        # place frame
        graph_frame.grid(row=8, column=1, columnspan=8)
        graph_frame.columnconfigure(0, weight=1)
        graph_frame.columnconfigure(1, weight=1)
        graph_frame.columnconfigure(2, weight=1)
        graph_frame.rowconfigure(0, weight=1)
        graph_frame.rowconfigure(1, weight=1)
        graph_frame.rowconfigure(2, weight=2)

        # place canvas in grid
        canvas_widget = canvas.get_tk_widget()
        canvas_widget.grid(row=0, column=0, sticky=tk.NSEW)
        canvas_widget.update_idletasks()

        # enabling this makes it two graphs:
        # canvas_widget.update()

        # before info
        print('Before resize in inches:')
        print(fig.get_size_inches())
        print(canvas.get_width_height())

        # resize graph
        fig.set_size_inches(1, 1)

        # after info
        print('After resize in inches:')
        print(fig.get_size_inches())
        print(canvas.get_width_height())

        # tried any combination and sequence of these, but none work:
        canvas.draw()
        canvas.get_tk_widget().update()
        canvas.draw_idle()
        canvas.flush_events()
        graph_frame.update()
        self.update()


if __name__ == '__main__':
    # run GUI
    gui = Gui()
    gui.mainloop()

结果：

无需额外的

canvas_widget.update()

调用：

额外的

canvas_widget.update()

电话：

我尝试更新和刷新现有的每个可能的小部件和根，但没有任何效果。

很高兴收到有关我做错了什么或我如何滥用东西的任何提示:-)

Answer 1

您可以根据所需的图大小更改画布尺寸：

fig.set_size_inches(1, 1, forward = True)
canvas.get_tk_widget().configure(width=fig.get_figwidth()*100, height=fig.get_figheight()*100)