let height=600;

​

let x=width/2;

let y=height/2;

​

let slow=20;

let r=45;

​

function setup() {

  createCanvas(width, height);

}

​

function draw() {

  background(0);

  circle(x,y,r);

  // current circleX = past circleX + (Mouse variation,+-) 

  // mouse variationX= mouseX-circleX

  // >> x=x+ ( (mouseX-x) );

  // >> y=y+ ( (mouseY-y) );

  // divided  variation by a number (for instane: 20)

  // = continuously add (1/20 * variation)

  x=x+ ( (mouseX-x) / slow );

  y=y+ ( (mouseY-y) / slow );

}

​