let i2 = 0;

let i3 = 0;

let deltaT = 0.0001;

let t = 0;

let sc = 100;

​

let k = 0.5;

let wu = 1.01;

let gu = 100;

​

let wc = 1.1;

let gamma = 0.001;

​

function setup() {

  createCanvas(400, 400);

  background(250);

}

​

function draw() {

  const u = gu * sin(wu * t)+100;

  let y1 = i1 * (i2 + wc);

  let y2 = i2;

  let e = u - y1;

  let ef = e * y2;

  let w = wc + i3;

  i1 += k * e - y2;

  i2 += y1 * w;

  i3 += gamma * ef;

  t += deltaT;

  translate(0, height / 2);

  noFill();

  stroke(0);

  ellipse(frameCount, -sc*w, 1, 1);

  line(0,-sc*wu,width,-sc*wu);

​

  noStroke();

  fill(255,0,0);

  ellipse(width/4,100,abs(i1),abs(i1));

  ellipse(2*width/4,100,abs(i2),abs(i2));

  ellipse(3*width/4,100,abs(i3),abs(i3));

}