​

let ox, oy;

let vx = 2.5;

let vy = 1.2;

let size = 5;

let lastTime;

​

function setup() {

  createCanvas(400, 400);

  background(5);

  //noStroke();

  stroke(255);

  strokeWeight(size);

  ox = width/2;

  oy = height/2;

  lastTime = millis();

}

​

function ppong(a, b) {

  return b * abs(fract(a / (2 * b)) * 2 - 1);

}

​

function draw() {

  background(5, 20);

  let t = millis() * 0.001 * 50;

  randomSeed(0);

  for (let i = 0; i < 1000; i++) {

    ox = random(width);

    oy = random(height);

    vx = random(-1, 1);

    vy = random(-1, 1);

    let x = ppong(ox + vx * t, width);

    let y = ppong(oy + vy * t, height);

    point(x, y);

    //circle(x, y, size);

  }

  if (millis() - lastTime > 1000) {

    print("FPS: " + frameRate());

    lastTime += 1000;

  }

}