希望使用Tkinter通过光标调整形状(矩形)的大小

import tkinter as tk

def on_button_press(event):
    global start_x, start_y
    start_x = event.x
    start_y = event.y

def on_button_release(event):
    global start_x, start_y
    end_x = event.x
    end_y = event.y
    canvas.create_rectangle(start_x, start_y, end_x, end_y, outline='red')

def on_motion(event):
    global start_x, start_y
    current_x = event.x
    current_y = event.y
    canvas.coords(rectangle, start_x, start_y, current_x, current_y)

root = tk.Tk()
canvas = tk.Canvas(root, width=400, height=400)
canvas.pack()

rectangle = canvas.create_rectangle(0, 0, 0, 0, outline='red')

canvas.bind('<ButtonPress-1>', on_button_press)
canvas.bind('<ButtonRelease-1>', on_button_release)
canvas.bind('<B1-Motion>', on_motion)

root.mainloop()