妖しく光る玉

let vecLocation = [];

let vecVelocity = [];

const NUM = 10;

function setup() {

  createCanvas(windowWidth, windowHeight);

  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));

  locationX = 0;

  }

}

​

function draw() {

  background(0);

  noStroke();

  fill(255);

  for(let i = 0; i < NUM; i++){

    fill(random(255),random(255),random(255));

    ellipse(vecLocation[i].x, vecLocation[i].y, random(16,256), random(16,256));

    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;

    }

  locationX = locationX + 1;

  }

}