let posY = 0;

let bullets = [];

let enemies = [];

let bullet, enemy;

let score = 0;

​

function setup() {

  createCanvas(400, 400);

  rectMode(CENTER);

  textAlign(CENTER);

}

​

function draw() {

  background(220);

​

  if (random(1) < 0.05) {

    enemy = new Enemy(random(width), random(-500), random(30, 50));

    enemies.push(enemy);

  }

​

  if (keyIsPressed) {

    if (key === "a") {

      posX -= 2;

    } else if (key === "d") {

      posX += 2;

    }

  }

​

  noStroke();

  fill(0);

  rect(posX + width / 2, height - 20, 60, 10);

​

  for (let b of bullets) {

    b.display();

    b.shoot();

  }

​

  for (let e of enemies) {

    e.display();

    e.move();

  }

​

  for (let b of bullets) {

    for (let e of enemies) {

      let d = dist(b.x, b.y, e.x, e.y);

      if (d < e.w / 2) {

        enemies.splice(enemies.indexOf(e), 1);

        score += 1;

      }

    }

  }

​

  textSize(25);

  fill(0);

  textStyle(NORMAL);

  text("SCORE", width - 70, 50);

​

  textSize(40);

  textStyle(BOLD);

  text(score, width - 70, 90);

}

​

function mousePressed() {

  bullet = new Bullet(posX, posY);

  bullets.push(bullet);

}

​