// not sure where this code originally came from ...
// anybody claims it? lunetta?

int counter;
int t;    // time
float xa, xb, x, y; // coordinates
float wx, wy, ws; // frequencies
float px, py, ps; // phases
float d; //decay
float Ax, Ay, As; // Amplitudes

void setup()
{
    //size (600,600, P3D);
    size (600,600);
    
    background(255);
    t = 0;
    d = 0.003;
    counter = 0;
    wx = 440;
    wy = 440;
    ws = 440;
    px = 4;
    py = 2;
    ps = 3;
    Ax = 250;
    Ay= 250;
    As = 250;   
}

void draw()
{
    beginShape(LINE_STRIP);
    for(t=0;t<1200;t++)
    {
	  Ax = Ax - Ax*d;
	  Ay = Ay - Ay*d;
	  As = As - As*d;
	  xa = Ax*sin(wx*t+px);
	  y = height/2 + Ay*sin(wy*t+py);
	  xb = As*sin(ws*t+ps);
	  x = width/2 + xa+xb;
	  //println("x:     "+x+"    y:     "+y);
	  curveVertex(x,y);
    }
    endShape();
}