CODEWITHSUNDEEP
pythontimepygametimedelay
Harbinger
Harbinger

Reputation: 13

Time delay in python/pygame without disrupting the game?

I was writing the code for the introduction to a game I was making, here introduction being blitting a series of images with a time delay of 4 seconds in between them. The problem is, using the time.sleep method also messes with the main loop and the program thus "hangs" for that period. Any suggestions please? [Intro and TWD are sound objects]

a=0
while True:
    for event in pygame.event.get():
        if event.type==QUIT:
            pygame.quit()
            sys.exit()
            Intro.stop()
            TWD.stop()
    if a<=3:
        screen.blit(pygame.image.load(images[a]).convert(),(0,0))
        a=a+1
        if a>1:
                time.sleep(4)
    Intro.play()
    if a==4:
            Intro.stop()
            TWD.play()

    pygame.display.update()

Upvotes: 1

Views: 3437

Answers (3)

ST6152
ST6152

Reputation: 95

If you have set tps then you could count 1 second by increasing a variable by 1 every iteration:

clock = pygame.time.Clock()

count = 0
a=0
while True:

    clock.tick(60) """ It's best to set this to the 
refresh rate of ur monitor, because this determines 
how many iterations of the loop in one second. 
ie; if this was set to 1 the loop would run once 
per second, but if it was 30, it would run 30 
times per second. """

    for event in pygame.event.get():
        if event.type==QUIT:
            pygame.quit()
            sys.exit()
            Intro.stop()
            TWD.stop()
    if a<=3:
        screen.blit(pygame.image.load(images[a]).convert(),(0,0))
        a=a+1
        if a>1:
                time.sleep(4)
    Intro.play()
    if a==4:
            Intro.stop()
            TWD.play()

    if count == 60: # incriment a every second
            count = 0
            a += 1

    count += 1
    pygame.display.update()

This also makes it easy for timings of more or less than a second. You simply have to do some multiplication.

Upvotes: -1

jfs
jfs

Reputation: 414129

Use neither time.sleep() nor time.time() with pygame. Use pygame.time functions instead:

FPS = 30 # number of frames per second
INTRO_DURATION = 4 # how long to play intro in seconds
TICK = USEREVENT + 1 # event type
pygame.time.set_timer(TICK, 1000) # fire the event (tick) every second
clock = pygame.time.Clock()
time_in_seconds = 0
while True: # for each frame
    for event in pygame.event.get():
        if event.type == QUIT:
            Intro.stop()
            TWD.stop()
            pygame.quit()
            sys.exit()
        elif event.type == TICK:
            time_in_seconds += 1

    if time_in_seconds < INTRO_DURATION:
        screen.blit(pygame.image.load(images[time_in_seconds]).convert(),(0,0))
        Intro.play()
    elif time_in_seconds == INTRO_DURATION:
        Intro.stop()
        TWD.play()

    pygame.display.flip()
    clock.tick(FPS)

Use pygame.time.get_ticks() if you need a finer time granularity than one second.

Upvotes: 1

flakes
flakes

Reputation: 23614

You could add in some logic in that will only advance a if 4 seconds have passed. To do this you can use the time module and get a starting point last_time_ms Every time we loop, we find the new current time and find the difference between this time and last_time_ms. If it is greater than 4000 ms, increment a.

I used milliseconds because I find its usually more convenient than seconds. 

import time

a=0
last_time_ms = int(round(time.time() * 1000))
while True:
    diff_time_ms = int(round(time.time() * 1000)) - last_time_ms
    if(diff_time_ms >= 4000):
        a += 1
        last_time_ms = int(round(time.time() * 1000))
    for event in pygame.event.get():
        if event.type==QUIT:
            pygame.quit()
            sys.exit()
            Intro.stop()
            TWD.stop()
    if a <= 3:
        screen.blit(pygame.image.load(images[a]).convert(),(0,0))
        Intro.play()
    if a == 4:
        Intro.stop()
        TWD.play()

    pygame.display.update()

Upvotes: 1

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