let x=200

let y=200;

​

​

function setup() {

  createCanvas(400, 400);

  extraCanvas=createGraphics(400,400)

  extraCanvas.clear()

}

​

function draw() {

  background(0);

  // trail

 extraCanvas.fill(255,23)

  extraCanvas.noStroke()

  extraCanvas.ellipse(pmouseX,pmouseY,40)

  //no trail

  x=x+random(-5,5)

  y=y+random(-5,5)

  square(x,y,20)

  image(extraCanvas,0,0)

}