儚い流星群 - OpenProcessing

mySketch
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let num = 1000;
let vecLocation = [];
let vecVelocity = [];
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  frameRate(random(1000));
  for (let i = 0; i < num; i++){
    vecLocation[i] = createVector(0, 0);
    vecVelocity[i] = createVector(random(-20,20), random(-20,20));
  }
}
​
function draw() {
  background(0);
  noStroke();
  fill(random(255), random(30), 155);
  for (let i = 0; i < num; i++){
    vecLocation[i].add(vecVelocity[i]);
​
  ellipse(vecLocation[i].x, vecLocation[i].y, random(7), random(7));
  
    
    if (vecLocation[i].x < 0 || vecLocation[i].x > width){
      vecVelocity[i].x = vecVelocity[i].y * random(-4,-1);
    }
    if (vecLocation[i].y < 0 || vecLocation[i].y > height){
      vecVelocity[i].y = vecVelocity[i].y * random(-2,-1);
    }
  }
}