var num;
var range;
var delta;
var x=[];
var yp=[];
var ym=[];
var p=[];
var dx;
var dz;
var dw;
var s;
var t;
var count;
var record;

function setup() {
num=2000;
range=2;
delta=1;
createCanvas(512, 256);
frameRate(20);
count=0;
s=1;
t=1;
record=false;
x[0]=0;
yp[0]=0;
ym[0]=0;
p[0]=0;
}

function draw()
{
background(51);
count = count+1;
dx=x[x.length-1]+delta;
x=append(x, dx);
dw=range*sqrt(x[x.length-2]);
p=append(p, dw);
var dyp=yp[yp.length-1]+random(-range, range);
yp=append(yp, dyp);
var dym=ym[ym.length-1]+random(-range, range);
ym=append(ym, dym);
stroke(256, 0, 0);
//// Draw a line connecting the points
if (record) {
s=width/x[x.length-1];
t=height/sqrt(x[x.length-1])/4;
translate(0, height/2);
scale(s, t);
translate(0, -height/2);
}
for (var i=1; i stroke(256, 0, 0);
line(x[i-1], yp[i-1]+height/2, x[i], yp[i]+height/2);
stroke(256, 256, 0);
line(x[i-1], p[i-1]+height/2, x[i], p[i]+height/2);
line(x[i-1], -p[i-1]+height/2, x[i], -p[i]+height/2);
}
if (count>0) {
record=true;
}
}