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Audiovisuals with SC - Example10b - voices not objects

See /f0blog/audiovisuals-with-sc/

//Example10b - voices not objects
//a little bit different from Example10a.  the one in the main loop where we invert the mapping.
(
s.latency= 0.05;
s.waitForBoot{
    //--window setup
    var width= 640, height= 480;
    var w= Window("Example10b - voices not objects", Rect(99, 99, width, height), false);
    var u= UserView(w, Rect(0, 0, width, height));
    //--variables
    var syns= {
        SynthDef(\av, {|freq= 300, amp= 0, pan= 0|
            var z= LPF.ar(LFSaw.ar(freq), freq+2000, amp);
            Out.ar(0, Pan2.ar(z, pan));
        }).play(s);
    }.dup(50);  //max 50 voices
    s.sync;
    //--interface
    ~num= 48;
    ~spreadx= 100;
    ~spready= 150;
    //--main loop
    u.drawFunc= {
        Pen.translate(width*0.5, height*0.5);  //offset drawing to the centre
        Pen.fillColor= Color.white;  //always fill with white color
        50.do{|i|
            var x= (i*~spreadx).fold(width* -0.4, width*0.4);
            var y= (i*~spready).fold(height* -0.4, height*0.4);
            if(i<~num, {
                Pen.fillOval(Rect.aboutPoint(Point(x, y), 10, 10));
                syns[i].set(\amp, 0);
            }, {
                i= i-~num;
                syns[50-i].set(
                    \freq, y.linexp(height* -0.4, height* 0.4, 2000, 200),
                    \amp, 0.05,
                    \pan, x.linlin(width* -0.4, width*0.4, -1, 1)
                );
            }, {
            });
        };
    };
    //--window management
    u.clearOnRefresh= true;
    u.background= Color.black;
    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= 47;
~num= 46;
~num= 10;
~num= 2;
~spreadx= 150;
~spreadx= 5;
~spready= 180;
~spready= 179;
~num= 40;
~spreadx= 3;
~spready= 3;
~spready= 30;
~num= 4;
~num= 2;
~num= 1;
Routine({101.do{|i| ~num= i.fold(0, 50)+1; 0.1.wait}}).play;
//close the window to stop or press cmd+.