Re: [pygame] Keyboard handling

[Chris Armstrong <carmstro@dynup.net>]

Thanks a bunch. This is what I was looking for. While tinkering, I 
figured something similar to this out, only I created Event types that
represented each key I wanted to look for, which in hind sight seems
really pointless :) Anyway, thank you very much, I greatly appreciate it.

Pete Shinners wrote:

>> Hey all, I'm writing a breakout clone in PyGame, and I'm trying
>> to implement acceleration for my paddle. I have a Paddle.Move()
>> function that continuously adds accel_rate to self.cur_accel, and then
>> moves the paddle self.cur_accel to the left or right. The problem is,
>> I want the cur_accel to be set back to 0 when the player lets go
>> of the key.. I couldn't find anything on 'key release' events, and
>> having a 'timeout' period for the key event seems nasty. Any suggestions?
> 
> 
> hello chris, it looks like you've already got a couple responses, but
> i'll just throw in one more here. here is a section of code from one
> of the projects i'm working with. in this game a spaceship will fly
> at turbo speed while the spacebar is down. here is what that chunk of
> code looks like.
> 
> 
>     def handleevent(self, e):
>             if e.type == QUIT:
>                 self.finish()
>                 return 1
>             elif e.type == KEYDOWN:
>                 elif e.key == K_SPACE:
>                     self.player.cmd_turbo(1)
>                     return 1
>                 elif e.key == K_ESCAPE:
>                     self.finish()
>                     return 1
>             elif e.type == KEYUP:
>                 key = e.key
>                 if key == K_SPACE:
>                     self.player.cmd_turbo(0)
>                     return 0
> 
> 
> if you want to base your movement off of the event queue, this can
> be an ideal way to do it. notice that this event handler code belongs
> in a special 'state' class i have, the code that calls this function
> looks like this.
> 
>         e = pygame.event.poll()
>         if e.type:
>             mystate.handleevent(e)
> 
> note here i check if e.type is nonzero. the event.poll() function
> will return an event type "NOEVENT", which means there are no
> pending events.
> 
> if you want to see an example of how to handle keyboard by just
> checking the current state each frame, see the aliens example.

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