import tkinter
import math

def hit_check_circle():
    dis = math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2))
    if dis <= r1 + r2:
        return True
    return False

def mouse_move(e):
    global x1, y1
    x1 = e.x
    y1 = e.y
    col = 'green'
    if hit_check_circle() == True:
        col = 'lime'
    canvas.delete('CIR1')
    canvas.create_oval(x1 - r1, y1 - r1, x1 + r1, y1 + r1, fill = col, tag = 'CIR1')

root = tkinter.Tk()
root.title('用圓形進行碰撞偵測')
canvas = tkinter.Canvas(width = 600, height = 400, bg = 'white')
canvas.pack()
canvas.bind('<Motion>', mouse_move)

x1 = 50
y1 = 50
r1 = 40
canvas.create_oval(x1 - r1, y1 - r1, x1 + r1, y1 + r1, fill = 'green', tag = 'CIR1')

x2 = 300
y2 = 200
r2 = 80
canvas.create_oval(x2 - r2, y2 - r2, x2 + r2, y2 + r2, fill = 'orange')

root.mainloop()