Question

我刚刚开始使用tkinter学习GUI。我写了一个非常简单的代码。该代码假定首先绘制q和t值。这部分是成功的，这里没有问题。然后，当我单击“拟合”按钮时，它应该找到最佳的线性拟合和绘图。它可以找到最佳的线性拟合，但不会更新绘图。我找不到更新情节的方法。

from tkinter import *
from scipy.optimize import curve_fit

class Window(Frame):

    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.master = master
        self.t = np.array([30,60,90,120,150,180,210,240,270,300,330,360,390,420,450,480,
             510,540,570,600,630,660,690,720,750,780,810,840,870,900,930,960,990,1020])
        self.q = np.array([781.25,413.22,255.10,173.01,125.00,94.52,73.96,59.45,48.83,40.82,
             34.63,29.74,25.83,22.63,20.00,17.80,15.94,14.36,13.01,11.83,10.81,
             9.92,9.13,8.43,7.81,7.26,6.76,6.31,5.91,5.54,5.21,4.90,4.62,4.37])
        self.popt = [0.0, 0.0]
        self.plot_window()

    def plot_window(self):
        self.master.title("DCA")
        self.pack(fill=BOTH, expand=1) 

        self.q_model = self.func(self.t, *self.popt)

        f, ax = plt.subplots()
        ax = plt.plot(self.t, self.q, 'b.') 
        ax = plt.plot(self.t, self.q_model, 'r-')

        canvas = FigureCanvasTkAgg(f, self)
        canvas.show()
        canvas.get_tk_widget().pack(side=tk.BOTTOM, fill=tk.BOTH, expand=True)        
        toolbar = NavigationToolbar2TkAgg(canvas, self)
        toolbar.update()
        canvas._tkcanvas.pack(expand=True)

        button1 = ttk.Button(self, text="Fit", command=lambda: self.fit())
        button1.pack()

    def func(self, t, a, b):
        return a*t+b

    def fit(self):
        self.popt, self.pcov = curve_fit(f=self.func, xdata=self.t, ydata=self.q)
        print(self.popt)


root = Tk()
root.geometry("700x500")
app = Window(root)
root.mainloop()

Answer 1

要更新tk中的pyplot图，您需要做两件事：

要更新的线对象的句柄（正在更改y数据）
用于强制重画的画布句柄

我注意到了其他一些小的错别字，因此我更正了以下代码。重要的呼叫是self.canvas.draw和from tkinter import * from scipy.optimize import curve_fit import matplotlib.pyplot as plt import numpy as np from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg class Window(Frame): def __init__(self, master=None): Frame.__init__(self, master) self.t = np.array([30,60,90,120,150,180,210,240,270,300,330,360,390,420,450,480, 510,540,570,600,630,660,690,720,750,780,810,840,870,900,930,960,990,1020]) self.q = np.array([781.25,413.22,255.10,173.01,125.00,94.52,73.96,59.45,48.83,40.82, 34.63,29.74,25.83,22.63,20.00,17.80,15.94,14.36,13.01,11.83,10.81, 9.92,9.13,8.43,7.81,7.26,6.76,6.31,5.91,5.54,5.21,4.90,4.62,4.37]) self.popt = [0.0, 0.0] self.plot_window() def plot_window(self): self.master.title("DCA") self.pack(side=TOP, fill=BOTH, expand=True) self.q_model = self.func(self.t, *self.popt) f, ax = plt.subplots() self.h_points = ax.plot(self.t, self.q, 'b.') self.h_line = ax.plot(self.t, self.q_model, 'r-')[0] canvas = FigureCanvasTkAgg(f, self) canvas.show() canvas.get_tk_widget().pack(side=BOTTOM, fill=BOTH, expand=True) self.canvas = canvas toolbar = NavigationToolbar2TkAgg(canvas, self) toolbar.update() canvas._tkcanvas.pack(side=TOP, fill=BOTH, expand=True) button1 = ttk.Button(self, text="Fit", command=lambda: self.fit()) button1.pack(side=TOP, fill=BOTH, expand=True) def func(self, t, a, b): return a*t+b def fit(self): popt, pcov = curve_fit(f=self.func, xdata=self.t, ydata=self.q) new_ydata = self.func(self.t, *popt) self.h_line.set_ydata(new_ydata) self.canvas.draw() root = Tk() app = Window(root) root.mainloop()：

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拟合后图不更新

1 个答案: