時々荒ぶる玉ども - OpenProcessing

mySketch
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let vecLocation = [];
let vecVelocity = [];
const NUM = 2;
let cls = [];
let size = [];
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  for(let i = 0; i < 3; i++){
    cls[i] = random(0,255)
  }
  for(let i = 0; i < NUM; i++){
    vecLocation[i] = createVector(width / 2, height / 2);
    vecVelocity[i] = createVector(random(-10,10),random(-10,10));
  }
  for(let i = 0; i < 2; i++){
    size[i] = 20;
  }
}
​
function draw() {
  background(0);
  fill(cls[0],cls[1],cls[2],200)
  rect(30,30,width - 60,height - 60)
  noStroke()
  fill(255);
  
  for(let i = 0; i < NUM; i++){
    ellipse(vecLocation[i].x, vecLocation[i].y,size[i],size[i]);
    vecLocation[i].add(vecVelocity[i]);
​
    if(vecLocation[i].x >= width - 50 || vecLocation[i].x <= 50){
      rnd = random(0.5,1.5);
      vecVelocity[i].y = vecVelocity[i].y * rnd;
      vecVelocity[i].x = vecVelocity[i].x * rnd;
      vecVelocity[i].x = vecVelocity[i].x * -1;
      for(let i = 0; i < 3; i++){
        cls[i] = random(0,255)
      }
      size[i] = random(10,30)
    }
​
    if(vecLocation[i].y >= height - 50 || vecLocation[i].y <= 50){
      rnd = random(0.5,1.5);
      vecVelocity[i].x = vecVelocity[i].x * rnd;
      vecVelocity[i].y = vecVelocity[i].y * rnd;
      vecVelocity[i].y = vecVelocity[i].y * -1;
      for(let i = 0; i < 3; i++){
        cls[i] = random(0,255)
      }
      size[i] = random(10,30)
    }
  }
}