var jump = 2/3;

​

function setup() {

  createCanvas(400, 400);

  background(220);

  a = createVector(0,0);

  b = createVector(width,0);

  c = createVector(width,height);

  d = createVector(0,height);

  x = random(width);

  y = random(height);

}

​

function draw() {

  strokeWeight(1);

  strokeWeight(1);

  point(a);

  point(b);

  point(c);

  point(d);

  for(var i = 0; i < 1000; i++){

    point(x,y);

    var r = floor(random(4));

    if(r == 0){

      x = lerp(x,a.x,jump);

      y = lerp(y,a.y,jump);

    }

    if(r == 1){

      x = lerp(x,b.x,jump);

      y = lerp(y,b.y,jump);

    }

    if(r == 2){

      x = lerp(x,c.x,jump);

      y = lerp(y,c.y,jump);

    }

    if(r == 3){

      x = lerp(x,d.x,jump);

      y = lerp(y,d.y,jump);

    }

  }

}