Audiovisuals with SC -Example18 - waveform

//Example18 - waveform
(
s.latency= 0.05;
s.waitForBoot{
l= 800; //global window size
b= Buffer.alloc(s, l, 1);
c= Buffer.read(s, Platform.resourceDir+/+"sounds/a11wlk01.wav");
SynthDef(\avTrk, {|in= 0, bufnum, rate= 40, sample= 1|
var z= In.ar(in, 1);
var trig= Impulse.ar(rate*0.92); //compensate
var index= Phasor.ar(trig, sample, 0, BufFrames.ir(bufnum)-1);
BufWr.ar(z, bufnum, index, 0);
SendTrig.ar(trig, 0, bufnum);
}).send(s);
SynthDef(\avSnd, {|out= 0, bufnum|
var z= PlayBuf.ar(
1,
bufnum,
BufRateScale.ir(bufnum)*LFPulse.kr(0.05, 0, 0.5, 0.2, -1.5),
Impulse.kr(LFPulse.kr(0.1, 0, 0.1, 2, 1)),
BufFrames.ir(bufnum)*LFNoise0.kr(0.2, 0.5, 0.5).round(0.2),
1
);
Out.ar(out, Pan2.ar(z));
}).send(s);
};
)

(
//--setup
var width= l, height= l;
var w= Window("Example18 - waveform", Rect(99, 99, width, height), false);
var u= UserView(w, Rect(0, 0, width, height));

//--variables
var theta= 0;
var fps= 60;
var arr= Array.fill(l, 0); //same as half windowsize above
var o= OSCresponder(s.addr, '/tr', {|t, r, m|
if(m[2]==0, { //redraw once for each cycle of amps
b.getn(0, l-1, {|data| {arr= data; u.refresh}.defer});
});
}).add;
var trk= Synth(\avTrk, [\in, 0, \bufnum, b, \rate, fps]).play;
var snd= Synth(\avSnd, [\out, 0, \bufnum, c]).play;

//--interface
~trails= 1;
~speed= 0;
~sample= 1;
~amp= 0.5;
~version= 0;

//--main loop
u.drawFunc= {
trk.set(\sample, ~sample);
Pen.fillColor= Color.grey(0, ~trails);
Pen.fillRect(u.bounds); //manually clear
Pen.strokeColor= Color.green;
switch(~version,
0, { //line
Pen.rotate(theta, width/2, height/2);
Pen.translate(0, height*0.5);
arr.do{|y, x|
var p= Point(x, y*(height*~amp));
if(x==0, {Pen.moveTo(p)}, {Pen.lineTo(p)});
};
Pen.stroke;
},
1, { //warp
Pen.rotate(theta, width/2, height/2);
Pen.translate(width*0.5, height*0.5);
arr.do{|y, x|
var p= Point(x*~amp, y*~amp).rotate(y*2pi);
if(x==0, {Pen.moveTo(p)}, {Pen.lineTo(p)});
};
Pen.stroke;
},
2, { //flower
Pen.translate(width*0.5, height*0.5);
Pen.moveTo(Point(arr[0], 0)*arr[0]);
arr.do{|y, x|
var p= Point(y, x)*y;
var a= x%width/width*2pi+theta;
Pen.lineTo(p.rotate(a));
};
Pen.stroke;
}
);
theta= theta+~speed;
};

//--window management
u.clearOnRefresh= false; //do not erase - just draw on top of
w.onClose= {
snd.free;
trk.free;
o.remove;
};
w.front;
CmdPeriod.doOnce({if(w.isClosed.not, {w.close})});
//note no animate_ here. the responder is driving the animation
)

//change these while the program is running
~sample= 2;
~sample= 10;
~sample= 1;
~trails= 0.2;
~speed= 0.1;
~speed= -0.05;
~trails= 0.01;
~amp= 0.02;
~speed= pi*0.25;
~amp= 0.2;
~sample= 2;
~version= 1;
~trails= 0.2;
~version= 2;
~sample= 1;
~version= 1;
~speed= 2pi*1.001;
~amp= 0.5;

//close the window to stop or press cmd+.
b.free; //free the fft buffer
c.free; //free the soundfile buffer