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Keys (Read 939 times)
t.o.p
Keys
Oct 5th, 2009, 9:10pm  
i'm having troubles with my program here.

instead of having if(key=='q') etc. how would i do it so i would have to type Quit or quit for it to exit instead of "q"?


Thanks!
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ben_hem
Re: Keys
Reply #1 - Oct 5th, 2009, 11:43pm  
you must be a linux user ;)

I would do it like this: keep a buffer of the last four keypresses.

array[] keyBuffer = new char[4];

every time a key is pressed, shift all the characters in the keyBuffer and add the last keyPress to the end.

void keyPressed(){
 for (int i=0;i<3;i++){
   keyBuffer[i] = keyBuffer[i+1];
 }
 keyBuffer[3] = key; // add the last keypress to the buffer
 checkBuffer();
}

Now you just a checkBuffer() function to see if the keyBuffer spells "quit."  Helpful commands here will be String.toLowerCase(someString), string += char, and/or Character.toLowerCase(someChar)...

--Ben
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« Last Edit: Oct 6th, 2009, 10:12am by ben_hem »  
WWW  
blindfish
Re: Keys
Reply #2 - Oct 6th, 2009, 2:22am  
You might also want to filter out special keys like Shift since they are registered as a key press and could obscure the correct string in the buffer.  Also, there were a couple of relevant threads posted a few months ago: Might be worth doing a search as there was some good advice posted IIRC.

Actually here they are:
http://processing.org/discourse/yabb2/num_1244664218.html

http://processing.org/discourse/yabb2/num_1223627482.html

I'm feeling nice today Smiley
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Where is the what if the what is in why?
 
ben_hem
Re: Keys
Reply #3 - Oct 6th, 2009, 10:19am  
good point, hadn't thought of that -- the shift key will be a ? mark in the buffer...rather than try to catch all coded keys, I would do this:
Quote:
String alphabet = "abcdefghijklmnopqrstuvwxyz";

boolean validKey(char key){
 for (int i=0;i<alphabet.length();i++){
   if (Character.toLowerCase(key) == alphabet.charAt(i)) return true;
 }
 return false;
}

just because then you know exactly what can go into your buffer -- no nasty surprises.       --Ben
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t.o.p
Re: Keys
Reply #4 - Oct 6th, 2009, 8:00pm  
alright i found out that i have to use "String" Syntax. but i have no idea how to do it =\ any ideas?!?!
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t.o.p
Re: Keys
Reply #5 - Oct 6th, 2009, 8:12pm  
Never mind thanks guy! i found what i had to use!

if(sBuffer.contains("quit")&&key==ENTER)
{
 exit();
}
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