let pt;

​

function setup() {

  createCanvas(400, 400); 

  pt = createVector();

}

​

function draw() {

  background(220);

  target = createVector(mouseX, mouseY);

  pt.x = lerp(pt.x, target.x, 0.1);

  pt.y = lerp(pt.y, target.y, 0.1);

  // print(x);

  fill(255, 0, 0);

  ellipse(target.x, target.y, 64, 64);

  fill(255);

  ellipse(pt.x, pt.y, 64, 64)

}