Pygame - different speeds

Question

How can i move different things in the game with different speeds? Using pygame.time.delay or pygame.time.wait will have an impact on the whole game. I want something like having a Rect moving at clock.tick(30) while another Rect moves at clock.tick(10). How can i do this?

Edit: What i'm looking for is actually not only the movement (this could be done of course with different movement amounts to be added to Rect.xandRect.y). For example i have drawn a man on its Surface who should run after a ball, i press the K_UP or K_DOWN and want also his legs to move (to have a more nice running picture!), so i draw them again at different positions and so on. So i need something more of controlling the frames rate i think.

score 1 · Answer 1 · edited May 23 '17 at 12:31

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This is what the Clock module in pygame is for. Check my answer in this question https://stackoverflow.com/a/35620064/5878272 on how to do it.

edited May 23 '17 at 12:31

Community

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answered Apr 03 '16 at 21:22

Fredrik

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Vincent · Answer 2 · 2016-04-01T15:24:27.453

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You can use thread, but the code can become messy...

Or you can set a "base" tick in your application, and then in your main loop, count iterations of the loop.

Example:

tick = 5 # one iteration = 5ms (it is the frame rate: 200FPS (theoric, of course! I think you might give an higer value)

#counters
rect1Count = 0
rect2Count = 2

delays 
rect1Delay = 10
rect2Delay = 30   

rect1Modulo = rect1Delay / tick # = 2
rect2Modulo = rect2Delay / tick # = 6

#main loop
while True:
    pygame.time.delay(tick)
    rect1Count +=1
    rect2Count +=1
    if rect1Count%rect1Modulo == 0:
         #move rect1 every 2 iteration (because 5 * 2 = 10)
         rect1Count = 0
    if rect2Count%rect2Modulo == 0:
         #every 3 iterations (so 5 * 6 = 30ms
         #move rect2
         rect2Count = 0
    #render code, etc...
    #You can easily add your K_UP and K_DOWN event here

I reset counter every iteration, to don't see counter values grow up too high...

edited Apr 01 '16 at 15:24

answered Apr 01 '16 at 15:19

Vincent

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Can you please send a link to read about Threads? Are they pygame-specific or common python Threads? – Apr 02 '16 at 17:20
Thank you for your idea. Why are you setting `rect1Count` and `rect2Count` to 0 in the main loop, since your using `%` do you need that? – Apr 02 '16 at 17:25
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@AmirTeymuri I reset counters to 0 in the main loop, to prevent them for growing too high and using too many memory... But if you have infinite memory, you don't have to do this! – Vincent Apr 11 '16 at 07:21
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And for threads, just see the doc : https://docs.python.org/3/library/threading.html?highlight=thread#module-threading (python 3.x) or https://docs.python.org/2.7/library/threading.html?highlight=thread#module-threading (python 2.x) – Vincent Apr 11 '16 at 07:25

Pygame - different speeds

2 Answers2