import pygame


def run_game():
    
    ## Initialize the pygame submodules and set up the display window.

    pygame.init()

    width = 640
    height = 480
    my_win = pygame.display.set_mode((width,height))

    # circle properties
    x = width/2
    y = height/2
    radius = 200
    color = (255, 255, 255)

    clock = pygame.time.Clock()
    
    ## The game loop starts here.
    
    keepGoing = True    
    while (keepGoing):

        ## Handle events.

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                keepGoing = False


        # How many milliseconds did the last round through the game loop take?
        time_passed = clock.tick()


        ## Draw picture and update display

        my_win.fill(pygame.color.Color("lightblue"))

        pygame.draw.circle(my_win, color, (x,y),radius)

        pygame.display.update()

    ## The game loop ends here.

    pygame.quit()


## Call the function run_game.

run_game()