My Sketch2 - OpenProcessing

mySketch
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let vecLocation = [];
let vecVelocity = [];
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(-10,10),random(-10,10));
  }
}
​
function draw() {
  background(0);
  noStroke();
  fill(random(0,255));
  for(let i=0;i<NUM;i++){
    ellipse(vecLocation[i].x,vecLocation[i].y,random(10,100),random(10,100));
    vecLocation[i].add(vecVelocity[i]);
    if(vecLocation[i].x>width || vecLocation[i].x<0){
      vecVelocity[i].x=vecVelocity[i].x*(-1);
    }
    if(vecLocation[i].y>height || vecLocation[i].y<0){
      vecVelocity[i].y=vecVelocity[i].y*(-1);
    }
}
}