使用Tkinter在画布上绘制、调整大小和移动三角形(Python)

import tkinter as tk

x1, y1 = 100, 100
x2, y2 = 200, 200
x3, y3 = 200, 100

def resize_triangle(event):
    global x1, y1, x2, y2, x3, y3
    x1, y1 = event.x - 50, event.y - 50
    x2, y2 = event.x + 50, event.y + 50
    x3, y3 = event.x + 50, event.y - 50
    canvas.delete("all")
    canvas.create_polygon(x1, y1, x2, y2, x3, y3, fill='red')

def move_triangle(event):
    global x1, y1, x2, y2, x3, y3
    dx = event.x - x1
    dy = event.y - y1
    x1, y1 = event.x, event.y
    x2, y2 = x2 + dx, y2 + dy
    x3, y3 = x3 + dx, y3 + dy
    canvas.delete("all")
    canvas.create_polygon(x1, y1, x2, y2, x3, y3, fill='red')

root = tk.Tk()
canvas = tk.Canvas(root, width=400, height=400)
canvas.create_polygon(x1, y1, x2, y2, x3, y3, fill='red')
canvas.pack()

canvas.bind("<B1-Motion>", resize_triangle)
canvas.bind("<Button-1>", move_triangle)

root.mainloop()