Re: [pygame] Capturing Multiple Keyboard Inputs

[Silver <rockachu2@xxxxxxxxx>]

On 1/15/2012 8:16 PM, Ian Mallett wrote:
> On Sun, Jan 15, 2012 at 7:46 PM, Ryan Strunk <ryan.strunk@xxxxxxxxx> wrote:
> 
>> Hello everyone,
>> I am testing my understanding of the pygame.key module by creating a
>> program
>> that pans the sound of a car engine and raises/lowers its frequency. While
>> the individual keys do exactly what they're supposed to, I run into a big
>> problem when I try to do two things at once. For example, if I hold the up
>> arrow, the frequency of the sound rises with no problem. If I then hold
>> down
>> the left arrow while still holding up, however, the frequency stops rising
>> and the pan begins to adjust itself. How can I make both keys carry out
>> their assigned task at the same time?
>> As a side note, aside from exporting the redundant code below into its own
>> methods, are there any other ways to check for multiple keys without giving
>> each its own if check?
>> Ugly code is below:
>>
>> import pygame
>> from sound_lib.stream import FileStream
>> from sound_lib.output import Output
>>
>> def main():
>>        clock = pygame.time.Clock()
>>        o = Output()
>>        sound = FileStream(file="sounds/car.wav")
>>        screen = pygame.display.set_mode((640, 400))
>>        sound.looping = True
>>        sound.play()
>>        pygame.key.set_repeat(50, 50)
>>        while(True):
>>                for event in pygame.event.get():
>>                        if event.type == pygame.KEYDOWN:
>>                                if event.key == pygame.K_UP:
>>                                        sound.frequency += 200
>>                                if event.key == pygame.K_DOWN:
>>                                        sound.frequency -= 200
>>                                if event.key == pygame.K_LEFT:
>>                                        if sound.pan <= -0.9:
>>                                                sound.pan = -0.9
>>                                        else:
>>                                                sound.pan -= 0.1
>>                                if event.key == pygame.K_RIGHT:
>>                                        if sound.pan >= 0.9:
>>                                                sound.pan = 0.9
>>                                        else:
>>                                                sound.pan += 0.1
>>                                if event.key == pygame.K_ESCAPE:
>>                                        exit()
>>                clock.tick(10)
>>
>> if __name__ == '__main__':
>>        main()
>>
>> Thanks,
>> Ryan
>>
> You should use pygame.key.get_pressed() to check whether the left/up keys
> are pressed.  Something like:
> 
> while pygame.event.get(): pass
> key = pygame.key.get_pressed()
> if key[K_LEFT]: #whatever
> if key[K_UP]: #whatever
> 
> Ian

OK, I am seriously confuzzled here. I thought that pygame.event.get()
gave you all the events, and that his code SHOULD capture multiple
keypresses.

What is the difference between get_pressed and event.get()?

Oh, and would the key repeat be worth doing manually to see if that is
the issue?

soemthing like:

waspressed = []
thisframepressed = []

every frame:
	thisframepressed = []
	if event.key in waspressed:
		## trigger again
		thisframepressed.append(event.key)
	else:
		waspressed.append(event.key)
	for i in waspressed:
		if not i in thisframepressed:
			waspressed.remove(i)