tinker - python3 - 添加调整点位置功能以修补绘图线

Question

下面的示例可以在画布上画一条线，我想添加一个功能来调整线条，就像编辑应用程序一样。

如何添加这样的功能？还是我应该使用任何其他更好的用户界面？

#!/usr/bin/env python3
import tkinter as tk

root = tk.Tk()

canvas = tk.Canvas(root, bg="white", width=600, height=400)
canvas.pack()

coords = {"x":0,"y":0,"x2":0,"y2":0}
# keep a reference to all lines by keeping them in a list 
lines = []

def click(e):
    # define start point for line
    coords["x"] = e.x
    coords["y"] = e.y

    # create a line on this point and store it in the list
    lines.append(canvas.create_line(coords["x"],coords["y"],coords["x"],coords["y"]))

def drag(e):
    # update the coordinates from the event
    coords["x2"] = e.x
    coords["y2"] = e.y

    # Change the coordinates of the last created line to the new coordinates
    canvas.coords(lines[-1], coords["x"],coords["y"],coords["x2"],coords["y2"])

canvas.bind("<ButtonPress-1>", click)
canvas.bind("<B1-Motion>", drag) 

root.mainloop()