Creating Expanding Random Colored Circles with Pygame in Python

This example shows how to implement an interactive visual effect using Python and the Pygame library: each mouse click creates a new circle centered at the cursor, which expands outward with a random color until it reaches a randomly chosen maximum radius, after which the circle disappears.

Below is the complete source code that creates the window, handles mouse events, manages multiple circles, assigns random colors, and updates the display.

import pygame, random, sys, time
pygame.init()
screen = pygame.display.set_mode([600, 400])
screen.fill((255, 255, 255))
radiusr = 0
arrradiusr = [0] * 10  # 圆的半径
arraddradiusr = [0] * 10  # 圆的半径增量
arrradiusbool = [False] * 10  # 圆是否存在   False代表该索引值下的圆不存在，True代表存在
arrradiusx = [0] * 10  # 圆的坐标x轴
arrradiusy = [0] * 10  # 圆的坐标y轴
RGBx = [0] * 10  # 颜色RGB值第一个值
RGBy = [0] * 10  # 颜色RGB值第二个值
RGBz = [0] * 10  # 颜色RGB值第三个值

while True:
    time.sleep(0.1)  # 0.1秒
    for event in pygame.event.get():  # 监听器
        if event.type == pygame.MOUSEBUTTONDOWN:  # 鼠标按下
            num = arrradiusbool.index(False)   #获取圆不存在的索引值
            arrradiusbool[num] = True          #将该索引值的圆设置为存在
            arrradiusr[num] = 0                #该圆的半径设置为0
            arrradiusx[num], arrradiusy[num] = pygame.mouse.get_pos()        #获取鼠标坐标
            RGBx[num] = random.randint(0, 255)       #获取颜色值
            RGBy[num] = random.randint(0, 255)       #获取颜色值
            RGBz[num] = random.randint(0, 255)       #获取颜色值
            pygame.draw.circle(screen, pygame.Color(RGBx[num], RGBy[num], RGBz[num]),
                               (arrradiusx[num], arrradiusy[num]), arrradiusr[num], 1)
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
    for i in range(10):
        if arrradiusbool[i] == False:     #如果圆不存在则跳过循环
            pass
        else:
            if (arrradiusr[i] < random.randint(10, 50)):       #随机圆的大小
                arraddradiusr[i] = random.randint(0, 5)        #圆的随机半径增量
                arrradiusr[i] += arraddradiusr[i]
                pygame.draw.circle(screen, pygame.Color(RGBx[i], RGBy[i], RGBz[i]),
                                   (arrradiusx[i], arrradiusy[i]), arrradiusr[i], 1)
            else:
                arrradiusbool[i] = False    #若圆已达到最大，这将该索引值的圆设置为不存在
    pygame.display.update()