Hotaru

let vecLocation = [];

let vecVelocity = [];

let diameter = [];

​

let t = [];

let colorT = [];

let eNum = 1;

const NUM = 15; //定数

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(24);

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

    vecLocation[i] = createVector(width/2, height/2);

    vecVelocity[i] = createVector(random(-10, 10), random(-10, 10));

    diameter[i] = random(20,50);

    colorT[i] = random(5);

    t[i] = random(0, 255);

  }

}

​

function draw() {

  background(20, 20, 60);

  noStroke();

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

    fill(255, 255, 0, t[i]);

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

    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;

    }

    diameter[i] = diameter[i] + eNum;

    t[i] = t[i] + colorT[i];

    if(diameter[i] > 50 || diameter[i] < 20){

      eNum = eNum * -1;

    }

    if(t[i] > 255 || t[i] < 0){

      colorT[i] = colorT[i] * -1;

    } 

  }

}