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let vecLocation = [];

let vecVelocity = [];

let diameter = [];

let r = [];

let g = [];

let b = [];

const NUM = 40;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(60);

  for(let i = 0; i < NUM; i++){

    vecLocation[i] = createVector(width/2, height/2);

    vecVelocity[i] = createVector(random(-5, 5), random(-5, 5));

    diameter[i] = random(200, 250);

    r[i] = random(200, 255);

    g[i] = random(200, 255);

    b[i] = random(0, 100);

  }

}

​

function draw() {

  background(0);

  noStroke();

  for(let i = 0; i < NUM; i++){

    fill(r[i], g[i], b[i], 127);

    ellipse(vecLocation[i].x, vecLocation[i].y, diameter[i], diameter[i]);

    vecLocation[i].add(vecVelocity[i]);

    if(vecLocation[i].x > width || vecLocation[i].x < 0){

      vecVelocity[i].x *= -1;

    }

    if(vecLocation[i].y > height || vecLocation[i].y < 0){

      vecVelocity[i].y *= -1;

    }

  }

}