/** For learning Classes and Arrays
  * AP CS Principles  10/2/2020
  * @Teacher:  Mr. Thoe
  */

var b = [];
//var numBalls;

function setup() {
  createCanvas(400, 400);
  //numBalls = 50;
  for(var i = 0; i < 50; i++){
    b[i] = new Ball();
  }
}

function draw() {
  background(120);
  for(var i=0; i < b.length; i++){
    b[i].show();
  }
}

class Ball{
  constructor(){
    this.x = random(width);
    this.y = random(height);
    this.Vx = random(-5,5);
    this.Vy = random(-5,5);
    this.grey = random(255);
  }
  
  show(){
    this.move();
    fill(this.grey);
    circle(this.x, this.y, 20);
  }
  
  move(){
    this.x += this.Vx;
    this.y += this.Vy;
    if(this.x < 0 || this.x > width){
      this.Vx *= -1;
    }
    if(this.y < 0 || this.y > height){
      this.Vy *= -1;
    }
  }
}