Flashback - OpenProcessing

mySketch
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let vecLocation=[];
let vecVelocity=[];
const NUM=100;
​
​
function setup(){
  createCanvas(windowWidth,windowHeight);
  frameRate(10);
  for (let i=0;i<NUM;i++){
   vecLocation[i]=createVector(width/2,height/2);
   vecVelocity[i]=createVector(random(-20,20),random(-20,20));
  }
}
​
function draw(){
  background(0);
  noStroke();
  fill(random(255),random(255),random(255),200);
  for (let i=0;i<NUM;i++){
   ellipse(vecLocation[i].x,vecLocation[i].y,random(0,100),random(0,100));
   vecLocation[i].add(vecVelocity[i]);
   if (vecLocation[i].x <0  ||  vecLocation[i].x >width || vecLocation[i].x===width/2){ 
     vecVelocity[i].x=vecVelocity[i].x*-1
  }
   if(vecLocation[i].y <0 || vecLocation[i].y >height || vecLocation[i].y===height/2){ 
     vecVelocity[i].y=vecVelocity[i].y*-1
  }
  }
}