let y = 200;

let angle = 90;

let diam = 20;

function setup(){

  createCanvas(windowWidth,windowHeight);

  background(0);

  fill(255);

  frameRate(60);

   setInterval(()=>{

    x =random(width);

    y =random(height);

    diam = random(2);

    angle = random(30);

  }, Math.random()*3000)

}

​

function draw(){

  fill(diam*(x/50),x/20,diam*(y/20),5)

  noStroke();

  stroke(diam*14,10);

  circle(x, y, diam);

  x += sin(angle)*diam;

  y += cos(angle)*diam;

  angle+=5;

  // diam = diam > 30 ? 0 : diam;

  diam++;

}