let angle, angleSpeed;

let yfreq, yscl, range;

let centerX, centerY;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  centerX = width/2;

  centerY = height/2;

  angle = 0;

  angleSpeed = 0.01;

  range = width/4;

  yfreq = 1;

  yscl = 1;

}

​

function draw() {

  background(0, 64);

  angle += angleSpeed;

  x = cos(angle)*range + centerX;

  y = sin(angle*yfreq)*range*yscl + centerY;

    fill(255);

  ellipse(x,y, 10, 10);

  yfreq = 0.375;

}