炎の呼吸 - OpenProcessing

mySketch
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let vecLocation = [];
let vecVelocity = [];
const NUM = 55;
​
function setup() {
  createCanvas(400, 400);
  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(255);
  for(let i = 0; i < NUM; i++){
    fill(random(127,250), random(0,127), 0, 250);
    ellipse(vecLocation[i].x, vecLocation[i].y, 20, random(0,100));
    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;
    }
  }
  
}