Python小游戏 如何重生雪球以及雪球与玩家碰撞

本人刚开始学习python
尝试做一个小游戏

现在我的问题是:
当雪球触底后 如何在任意位置再重生一个雪球
以及如何达成
当雪球与玩家碰撞 游戏结束 这个功能

谢谢。

以下是我的代码:

import numpy as np 
import cv2 
import random

WIDTH = 20
HEIGHT = 10

player_position = 0
ice_position = [0, random.randint(0, WIDTH - 1)]

while True:
    #init world
    arr = np.zeros((HEIGHT, WIDTH)).astype(np.uint8)
    #populate player
    arr[-1, player_position] =255
    #populate ice
    arr[ice_position[0], ice_position[1]] = 100
    #show world
    arr = cv2.resize(arr, (WIDTH * 50, HEIGHT * 50), interpolation = cv2.INTER_NEAREST)


    cv2.imshow("game", arr)  #show image
    k = cv2.waitKey(100) # wait for 100ms

    # make the ice fall
    ice_position[0] += 1
    
    if ice_position[0] !=10:
        arr[ice_position[0], ice_position[1]] = 100
    else:
        ice_position[0] = 0



    # player action
    if k == ord("d"):            
        if player_position < WIDTH - 1:
            player_position += 1

    if k == ord("a"): 
        if player_position > 0:
            player_position -= 1       
        

    if k == ord("q"):
        exit()