Re: [pygame] moving a box diagnally

[kevin hayes <kevinosky@xxxxxxxxx>]

Thanks claudio, works great now!

On Sun, Sep 19, 2010 at 1:22 AM, claudio canepa <ccanepacc@xxxxxxxxx> wrote:

On Sun, Sep 19, 2010 at 5:08 AM, kevin hayes <kevinosky@xxxxxxxxx> wrote:

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()

You change the box position only if an event is present, so you need to move the mouse or press keys to move.

Move out of the event loop the lines that change the position, that is, dedent one level the lines:

box_x += ...

box_y += ...

--

claudio