let y = 1;

let easing = 0.05;

​

function setup() {

  createCanvas(720, 400);

  noStroke();

  background(0);

}

​

function draw() {

​

​

  let targetY = mouseY;  // breathing input // also circle

  let dy = targetY - y;

  y += dy * easing;

  y = constrain(y, 50,350) // max and min 

​

  ellipse(x, y, 6, 6);

  x=x+0.3

}