[pygame] moving a box diagnally

[kevin hayes <kevinosky@xxxxxxxxx>]

Hi, I'm just beginning to learn python and pygame. I've gone through the first four chapters of "Game Programming, The L-line, the Express Line to Learning.  Right now I'm working on an exercise that asks me to "make a box that moves in a diagonal path. Can someone tell me why when I run the code the program only executes while I move the mouse? Also, can you tell me how i can change my code to avoid this? Thanks, Kevin

here is my code:

import pygame

pygame.init()

screen = pygame.display.set_mode((640, 480))

pygame.display.set_caption("Diagonal Red Square")

background = "">

background = "">

background.fill((0, 0, 0))

box = pygame.Surface((20, 20))

box = box.convert()

box.fill((255, 0, 0))

box_x = 0   #box variable for the x-axis

box_y = 0   #" " y-axis

clock = pygame.time.Clock()

keepGoing = True

while keepGoing:

    clock.tick(30)

    for event in pygame.event.get():

        if event.type == pygame.QUIT:

            keepGoing = False

        box_x += 5

        box_y += 5

    if box_y > screen.get_height():  #checking for screen boundaries

            box_y = 0

    if box_x > screen.get_width():

            box_x = 0

     

    screen.blit(background, (0, 0))

    screen.blit(box, (box_x, box_y))

    pygame.display.flip()

pygame.quit()