Audiovisuals with SC -Example13 - balls

//Example13 - balls
(
s.latency= 0.05;
s.waitForBoot{

//--window setup
var width= 640, height= 480;
var w= Window("Example13 - balls", Rect(99, 99, width, height), false);
var u= UserView(w, Rect(0, 0, width, height));

//--variables
var maxNum= 30;
var pats= {Pstutter(7, Pshuf(#[0, 0, 0, 0.1, 0.25, 0.5, 0.75, 1], inf)).asStream}.dup(maxNum);
var syns= {
SynthDef(\av, {|freq= 300, amp= 0, pan= 0|
var z= SinOsc.ar(0, BPF.ar(LFSaw.ar(freq, 0, 2pi), freq));
Out.ar(0, Pan2.ar(z, pan, amp));
}, #[0.02, 0.05, 0.05]).play(s);
}.dup(maxNum);
s.sync;

//--interface
~num= 1;
~radius= 20;
~spread= 0.3;
~max= 4000;

//--main loop
u.drawFunc= {
Pen.translate(width*0.5, height*0.5);
Pen.strokeColor= Color.black;
maxNum.do{|i|
var a= pats[i].next;
var x= sin(i/maxNum*2pi)*a;
var y= cos(i/maxNum*2pi)*a;
if(i<~num, {
syns[i].set(
\freq, y.linexp(-1, 1, ~max, 80),
\amp, a*(1-(i/maxNum)*0.5),
\pan, x
);
p= Point(x, y)*[width, height]*~spread;
Pen.fillColor= Color.hsv(x*0.5+0.5, y*0.5+0.5, 0.8, a);
Pen.fillOval(Rect.aboutPoint(p, ~radius*a, ~radius*a));
Pen.line(p, p*a);
Pen.stroke;
}, {
syns[i].set(\amp, 0);
});
};
};

//--window management
u.clearOnRefresh= true;
u.background= Color.white;
w.onClose= {syns.do{|x| x.free}};
w.front;
u.animate= true;
CmdPeriod.doOnce({if(w.isClosed.not, {w.close})});
};
)

//change these while the program is running
~num= 2;
~num= 3;
~num= 4;
~num= 5;
~num= 7;
~num= 15;
~num= 30;
~spread= 0.1;
~max= 2000;
~max= 8000;
~spread= 0.4;
~num= 4;

//close the window to stop or press cmd+.