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 Forum index » DIY Hardware and Software » ChucK programming language
Stepping through an array on key press
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yoshima



Joined: Nov 28, 2009
Posts: 15
Location: UK
PostPosted: Mon Apr 26, 2010 3:08 pm    Post subject: Stepping through an array on key press
Subject description: How do I make it loop?		 Reply with quote  Mark this post and the followings unread
Hello,

I'm trying to get ChucK to step through an array each time a key is pressed on the keyboard. It works but it only goes through the array once....

How can I get it to keep looping through?

Thank for any help....

Heres my code so far.....

Code:
// HID
Hid hi;
HidMsg msg;

// which keyboard
0 => int device;
// get from command line
if( me.args() ) me.arg(0) => Std.atoi => device;

// open keyboard (get device number from command line)
if( !hi.openKeyboard( device ) ) me.exit();
<<< "keyboard '" + hi.name() + "' ready", "" >>>;

// Patch
FMVoices v => JCRev r => dac;

0 => v.gain;

[ 0, 0, 3, 5, 5, 6, 9, 3, 4, 2, 1, 5, 7 ] @=> int song [];

int i;


// infinite event loop
while( true )
{
    // wait for event
    hi => now;
   
    // get message
    while( hi.recv( msg ) )
    {


{
   
    if (msg.isButtonDown())
    {           
        Std.mtof(60+song[i++]) => float freq;
        freq => v.freq;
        <<<song>>>;
        1 => v.noteOn;
        0.5 => v.gain;   
        0.2::second => now;
    }
   
    else
    {
        0 => v.noteOff;
    }     
}
}
}
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vrachnasormora



Joined: Mar 22, 2007
Posts: 42
Location: Preveza,Greece
PostPosted: Mon Apr 26, 2010 3:32 pm    Post subject: Reply with quote  Mark this post and the followings unread
Hi, try changing this line:
Code:
Std.mtof(60+song[i++]) => float freq;

to:
Code:
Std.mtof(60+song[++i%song.size()]) => float freq;
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yoshima



Joined: Nov 28, 2009
Posts: 15
Location: UK
PostPosted: Mon Apr 26, 2010 3:49 pm    Post subject: Reply with quote  Mark this post and the followings unread
It works!! Thanks for the help...

But I have to remove the line:

Code:
<<<song>>>;


What code do I need for it to print the number in the array?

Thanks,
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vrachnasormora



Joined: Mar 22, 2007
Posts: 42
Location: Preveza,Greece
PostPosted: Mon Apr 26, 2010 4:16 pm    Post subject: Reply with quote  Mark this post and the followings unread
You could again use:
Code:
<<< song[i%song.size()] >>>;

but because the modulo operation is quite expensive CPU-wise to re-express as you have already compute it, I would suggest:
Code:
   if (msg.isButtonDown())
            {           
                Std.mtof(60+song[i]) => float freq;
                freq => v.freq;
                <<<song[i]>>>;
                ++i%song.size() => i;
                1 => v.noteOn;
                0.5 => v.gain;   
                0.2::second => now;
            }

plus now you don't lose the first element of the array at the start of the program.Bye
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yoshima



Joined: Nov 28, 2009
Posts: 15
Location: UK
PostPosted: Mon Apr 26, 2010 4:33 pm    Post subject: Reply with quote  Mark this post and the followings unread
wow... thanks...

you have been really helpful...

cheers... Very Happy
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