Summer Night - OpenProcessing

mySketch
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let vecLocation = [];
let vecVelocity = [];
const NUM = 10;
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  frameRate(30); 
  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, 0, 60); 
  noStroke(); 
  fill(255, 255, random(255)); 
  for (let i = 0; i < NUM; i++) {
    vecLocation[i].add(vecVelocity[i]); 
    ellipse(vecLocation[i].x, vecLocation[i].y, random(5,10),random(5,10)); 
    if (vecLocation[i].x < 0 || vecLocation[i].x > width) {
      vecVelocity[i].x = vecVelocity[i].x * -1; 
    }
    if (vecLocation[i].y < 0 || vecLocation[i].y > height) { 
      vecVelocity[i].y = vecVelocity[i].y * -1; 
    }
  }
}