let velocity2 = 1.7;

let offset = 0; 

let offset2 =0 ;

let w = 0;

let h = 0; 

​

function setup() {

  createCanvas(600, 600);

}

​

function draw() {

  fill(0);

  offset = velocity + offset;

  offset2 = velocity2 + offset2;

  background(220, 220,220,30);

  w = 0 + offset;

  h = 0 + offset2;

  ellipse(w, h, 50);

  if((w > width)){

    velocity = -velocity;

  }

  if((h > height)){

    velocity2 = -velocity2;

  }

  if(w < 0){

    velocity = -velocity;

  }

  if(h < 0){

    velocity2 = -velocity2;

  }

}