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Index › Programming Questions & Help › Syntax Questions › Async Key Request
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Async Key Request (Read 1091 times)
Killian
Async Key Request
Oct 12th, 2009, 12:25pm  
Hi,

I'm sorry for opening a thread about this topic, maybe there's already one in the forum. I don't know.

I just loaded a picture of a small spaceship and I can control its position by using 'a' and 'd'.
Then I said that when pressing 'k' the ship must fire. It's doing very well, but unfortunately I can't press two keys at the same time.

That means, I can just fire when the ship doesn't move.
Is there any possibility to achieve a proper navigation for such a simple spaceship?

Hope you understand my intention.
Sorry for my bad englisch, I'm from Germany Wink
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ben_hem
Re: Async Key Request
Reply #1 - Oct 12th, 2009, 1:09pm  
Multiple keypresses can be handled by flagging booleans 'true' when a key is pressed and 'false' when the same key is released...you need a boolean for each key.  e.g.:

boolean up, down, left, right;

void keyPressed(){
 switch(key){
   case('a'):
   left = true;
   break;
   case('d'):
   right = true;
   break;
 }
}

void keyReleased(){
 switch(key){
   case('a'):
   left = false;
   break;
   case('d'):
   right = false;
   break;
 }
}

void draw(){
 checkKeys();
}

void checkKeys(){
 if (left)... // move left
 if (right)... // move right
}
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WWW  
Killian
Re: Async Key Request
Reply #2 - Oct 12th, 2009, 1:35pm  
Hi,
it's that easy? Amazing Smiley

Thanks a lot, this really helps me!
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blindfish
Re: Async Key Request
Reply #3 - Oct 12th, 2009, 2:21pm  
It is a topic that has come up before.  If you did try to search, watch out for the 'This post was made in the last...' option, as it defaults to a week; which isn't nearly long enough...
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Where is the what if the what is in why?
 
Killian
Re: Async Key Request
Reply #4 - Oct 12th, 2009, 3:09pm  
Yeah, if I'd had known what to look for I would have found something. Actually I tried the search function with the topic keywords and it always said: "sorry, 0 hits"  Roll Eyes

I didn't know how to correctly name the problem, you know?
And first of all I explained I'm sorry for this. So don't shout at me.  Wink
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