[chuck-users] Looping

[Alberto Alassio]

Yeah, now it's clear. thank you very much

On Tue, Sep 25, 2012 at 9:58 PM, Rich Caloggero <rjc at mit.edu> wrote:

> If I just want to do a really stupid thing like a Sine at 220 Hz that
>> sounds for 2 seconds and then stops for 2 seconds and then goes again. How
>> could I do?
>>
>
>
> // define connection
>
> SinOsc s => dac;
> .2 => s.gain;
> 220 => s.freq;
>
> // now we let the machine run for two seconds producing the sine wave
> 2::second => now;
>
> // now we let it run for two seconds, producing no sound
>
> 0 => s.gain;
> 2::second => now;
>
> // ... and again for two seconds producing a tone
> .2 => s.gain;
> 2::second => now;
>
> The secret is in the "=>' operator. Its not strictly an assignment when
> its second argument is the now keyword.  What this is doing is essentially
> suspending your code for the indicated amount of time and letting the Chuck
> virtual machine compute the samples and send them to the dac.
>
> When you use looping is when you want to modify some of the parameters of
> the thing being computed in realtime.  In that case, you generally loop and
> each time around the loop you change parameters, then set now to some
> value, say .1 second. This then would suspend your code for .1 seconds each
> time around the loop. When your code regains control, you change parameters
> and then suspend it again and let Chuck compute.  So, for instance:
>
> // using same connection graph as above:
>
> while (true) {
> s.freq + .1 => s.freq;
> .1::second => now;
> } // while
>
> Hope this helps ...
> -- Rich
>
>
> From: Alberto Alassio
> Sent: Tuesday, September 25, 2012 3:36 PM
> To: chuck-users at lists.cs.**princeton.edu<chuck-users at lists.cs.princeton.edu>
> Subject: [chuck-users] Looping
>
>
> I cannot understand how the while structure has to be used. I mean, I
> understood that while ( true ) means infinite loop
> and also that while ( n::second => now ) means an "n" second loop duration
> but...
>
> If I just want to do a really stupid thing like a Sine at 220 Hz that
> sounds for 2 seconds and then stops for 2 seconds and then goes again.
> How could I do? I thought that it was necessary just to do something like
> this
>
> SinOsc s => dac;
> .2 => s.gain;
> 220 => s.freq;
> while ( 2::second => now)
> 0 =>s.gain
>
> but I know that it's not the right way, also because in this method I
> would have to rewrite this thing an infinite ( whiletrue ahahah) number of
> times to have what I'm looking for.
>
> And I don't actually understand {} . How am I supposed to use these?
>
> Thanks
>
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