如何从tkinter中导出.html格式的绘图

from tkinter import *
from tkinter import messagebox
from tkinter import filedialog

root = Tk()
canvas = Canvas(root, width=500, height=500)
canvas.pack()

# 在画布上绘制图形或图表的代码

def save_as_html():
    file_path = filedialog.asksaveasfilename(defaultextension='.html')
    if file_path:
        try:
            with open(file_path, 'w') as file:
                file.write(canvas.postscript(file=file_path, colormode='color'))
            messagebox.showinfo('保存成功', '绘图已保存为.html文件')
        except Exception as e:
            messagebox.showerror('保存失败', str(e))

save_button = Button(root, text='保存为.html', command=save_as_html)
save_button.pack()

root.mainloop()