Tkinter和Matplotlib中的按钮

Question

我想通过按下按钮在Tkinter中生成Matplotlib图。该按钮应启动数据采集例程(最终从串行端口)，并在采集过程完成时绘制数据。下面的代码经过简化，只包含一些虚拟数据。我的问题是，当按下"plot“按钮时，没有出现图形。

import tkinter
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg)
from matplotlib.figure import Figure

window = tkinter.Tk()

fig = Figure(figsize=(5, 4), dpi=100)
ax = fig.add_subplot(1, 1, 1)
canvas = FigureCanvasTkAgg(fig, master=window) 
canvas.draw()

def plotData(ax):
    xs = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    ys = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    ax.clear()
    ax.plot(xs, ys)
   
CloseButton = tkinter.Button(master=window, text="Close", command=window.destroy)
PlotButton = tkinter.Button(master=window, text = "Plot", command = lambda: plotData(ax))
    
CloseButton.pack(side=tkinter.LEFT, padx = 10, pady = 10)
PlotButton.pack(side=tkinter.LEFT, padx = 10, pady = 10)

canvas.get_tk_widget().pack(side=tkinter.RIGHT, fill=tkinter.BOTH, expand=1)

tkinter.mainloop()

Answer 1

您需要在函数的末尾添加canvas.draw()。

def plotData(ax):
    xs = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    ys = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    ax.clear()
    ax.plot(xs, ys)
    canvas.draw()