如何将碰撞添加到tkinter中的对象(圆)列表？

import tkinter as tk

class Circle:
    def __init__(self, x, y, radius, velocity):
        self.x = x
        self.y = y
        self.radius = radius
        self.velocity = velocity

    def move(self):
        self.x += self.velocity[0]
        self.y += self.velocity[1]

def collision_detection(circles):
    for i in range(len(circles)):
        for j in range(i+1, len(circles)):
            circle1 = circles[i]
            circle2 = circles[j]
            distance = ((circle1.x - circle2.x)**2 + (circle1.y - circle2.y)**2)**0.5
            if distance <= circle1.radius + circle2.radius:
                # Handle collision, e.g., change color or velocity
                pass

def update(canvas, circles):
    canvas.delete("all")
    for circle in circles:
        canvas.create_oval(circle.x - circle.radius, circle.y - circle.radius,
                           circle.x + circle.radius, circle.y + circle.radius,
                           fill="red")
        circle.move()
    collision_detection(circles)
    canvas.after(16, update, canvas, circles)  # Update every 16 milliseconds (approximately 60 fps)

# Create a window
window = tk.Tk()
window.title("Collision Detection")
window.geometry("800x600")

# Create a canvas
canvas = tk.Canvas(window, width=800, height=600)
canvas.pack()

# Create circles
circle1 = Circle(100, 100, 30, (2, 1))
circle2 = Circle(200, 200, 40, (-1, 2))
circles = [circle1, circle2]

# Start animation
update(canvas, circles)

# Run the window main loop
window.mainloop()