# -*- coding: utf-8 -*-
"""
Created on Tue Oct 18 20:46:18 2022

@author: Roman
"""

import tkinter as tk
import numpy as np
import matplotlib.pyplot as plt
import json

def plot():
    data = {
        "x": [],
        "y": []
    }
    
    with open('data.json', 'r') as f:
        data = json.load(f)
    plt.figure()
    plt.plot(data['x'], data['y'], "*r", label='Данные')
    x = np.linspace(min(data['x']), max(data['x']), 1000)
    for i in range(1, 6):
        p = np.polyfit(data['x'], data['y'], i)
        y = np.polyval(p, x)
        plt.plot(x, y, label=f"Полином {i}-й степени")
    plt.legend()
    plt.grid()
    plt.savefig('last_image.png')
    img = tk.PhotoImage(file='last_image.png')
    image_label.configure(image=img)
    image_label.image = img


window = tk.Tk()
img = tk.PhotoImage(file='last_image.png')
image_label = tk.Label(text="Здесь буде график")
image_label.grid(row=0, column=0)
button = tk.Button(text='Построить график', command=plot)
button.grid(row=1, column=0)
window.mainloop()