蛍

let vecLocation = [];

let vecVelocity = [];

const NUM = 50;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate()

  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();

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

    ellipse(vecLocation[i].x, vecLocation[i].y, random(20), random(20));

    vecLocation[i].add(vecVelocity[i]);

    if(vecLocation[i].x> width || vecLocation[i].x < 0){

      vecVelocity[i].x = -vecVelocity[i].x;

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

      }

     if(vecLocation[i].y> width || vecLocation[i].y < 0){

      vecVelocity[i].y = -vecVelocity[i].y;

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

      }

    }

}

​