let enemies = [];

let bosses = [];

let points = 0;

let pixelImages = {};

let kinds = [];

let bakImg = '';

​

let bossImg;

let spider;

let shipImg;

let mask;

let virus;

​

let alfalfa = 230;

​

function preload() {

  loadImage('https://i.imgur.com/9e7XLq4.png', img => (pixelImages.bossImg = img));

  loadImage('https://i.imgur.com/IOgyEo0.png', img => (pixelImages.spider = img));

  loadImage('https://i.imgur.com/x8fFXu0.png', img => (pixelImages.shipImg = img));

  loadImage('https://i.imgur.com/zydid3N.png', img => (pixelImages.mask = img));

  loadImage('https://i.imgur.com/H9bS8wf.png', img => (pixelImages.virus = img));

}

​

function setup() {

  createCanvas(600, 450);

  kinds = ['bossImg', 'spider', 'shipImg', 'mask', 'virus'];

  bakImg = floor(random(kinds.length - 1));

}

​

function screenItems() {

  background(0);

  image(pixelImages[kinds[bakImg]], 0, 20, 600, 400);

  fill(0, alfalfa);

  noStroke();

  rect(0, 0, 600, 450);

​

  fill(200);

  textSize(30);

  fill(200, 0, 0);

  text(points, 560, 30);

}

​

class Projectile {

  constructor(x, y) {

    this.x = x;

    this.y = y;

    this.speed = 3;

  }

}

​

class Ship {

  constructor() {

    this.x = 300;

    this.y = 405;

    this.sizW = 32;

    this.sizH = 40;

    this.health = 5;

  }

​

  show() {

    image(pixelImages.shipImg, this.x, this.y, this.sizW, this.sizH);

  }

​

  healthBar() {

    fill(40);

    stroke(190);

    rect(3, 4, 20, 77);

    for (var i = 0; i < this.health; i++) {

      image(pixelImages.shipImg, 5, 15 * i + 5, 15, 15);

    }

  }

}

​

const nebuchadnezzar = new Ship();

​

class Boss {

  constructor(x, y) {

    this.x = x; //180

    this.y = y; //10

    this.siz = 70;

    this.speed = -2;

    this.health = 5;

    this.bombs = [];

  }

​

  show() {

    for (var i = 0; i < bosses.length; i++) {

      image(pixelImages.bossImg, this.x, this.y, this.siz, this.siz);

    }

  }

​

  move() {

    if (this.y < 150) {

      if (this.x < 50 || this.x > 470) {

        this.speed = -this.speed;

        this.y += 30;

      }

    } else {

      if (this.x < 50 || this.x > 470) {

        this.speed = -this.speed;

        this.y = 200;

      }

    }

    this.x += this.speed;

  }

​

  //create bombs

  makeB() {

    let ran = floor(random(0, 3));

    let probabilityOfDropping = random();

    let min = 50;

    if (enemies.length <= 0) {

      min = 1;

      probabilityOfDropping += 0.01;

    }

    // if (millis() % floor(random(min, 200)) === 0) {

    if (probabilityOfDropping > 0.97) {

      this.bombs.push({

        x: bosses[ran].x + 35,

        y: bosses[ran].y + 70

      });

    }

  }

  //bomb falls from boss

  dropB() {

    for (var i = 0; i < this.bombs.length; i++) {

      if (this.bombs[i].y > 600) {

        this.bombs.splice(i, 1);

      } else {

        noStroke();

        fill(200, 200, 0, random(100, 255));

        triangle(

          this.bombs[i].x - 5,

          this.bombs[i].y - 8,

          this.bombs[i].x + 5,

          this.bombs[i].y - 8,

          this.bombs[i].x,

          this.bombs[i].y + 10

        );

        fill(180, 0, 0);

        ellipse(this.bombs[i].x, this.bombs[i].y, 5, 20);

        this.bombs[i].y += 2;

        this.bombs[i].x += random(-1, 1);

      }

    }

  }

  // bomb hits the ship

  hitB() {

    for (var i = 0; i < this.bombs.length; i++) {

      let D = dist(

        nebuchadnezzar.x + nebuchadnezzar.sizW / 2,

        nebuchadnezzar.y + nebuchadnezzar.sizH,

        this.bombs[i].x,

        this.bombs[i].y

      );

​

      // fix size of bomb not fixed

      if (D < nebuchadnezzar.sizW / 2 + 5) {

        this.bombs.splice(i, 1);

        nebuchadnezzar.health--;

      }

    }

  }

}

​

class Enemy {

  constructor(x, y, kind) {

    this.x = x;

    this.y = y;

    this.speed = 4;

    this.kind = kind;

    this.s = 25;

  }

​

  faster() {

    this.speed = 9;

  }

​

  showEnemy() {

    image(pixelImages[this.kind], this.x, this.y, this.s, this.s);

  }

​

  moveEnemy() {

    if (this.x > 550 || this.x < 10) {

      this.speed = -this.speed;

      this.y += 30;

    }

    this.x += this.speed;

    this.y > 650 ? (enemies = []) : '';

  }

​

  crash() {

    let D = dist(this.x, this.y, nebuchadnezzar.x, nebuchadnezzar.y);

    if (D < 20) {

      this.y = 500;

      nebuchadnezzar.health--;

    }

  }

}

​

// Populate enemies array with 3 different enemies

for (var i = 1; i < 14; i += 1) {

  enemies.push(new Enemy(i * 40, 80, 'virus'));

  enemies.push(new Enemy(i * 40, 140, 'mask'));

  enemies.push(new Enemy(i * 40, 195, 'spider'));

}

​

// Populate bosses array

for (var i = 0; i < 300; i += 100) {

  bosses.push(new Boss(180 + i, 10));

}

​

var moveProjectile = function() {

  for (var i = 0; i < projectiles.length; i++) {

    projectiles[i].y -= projectiles[i].speed;

    fill(255, 0, 0);

    ellipse(

      projectiles[i].x + nebuchadnezzar.sizW / 2,

      projectiles[i].y + 41,

      5,

      5

    );

    if (projectiles[i].y < -10) {

      projectiles.splice(i, 1);

    }

  }

};

​

function projectileCollision() {

  for (var i = 0; i < projectiles.length; i++) {

    for (var j = 0; j < enemies.length; j++) {

      let D = dist(

        projectiles[i].x,

        projectiles[i].y,

        enemies[j].x,

        enemies[j].y

      );

      if (D < 15 + 5) {

        enemies.splice(j, 1);

        alfalfa -= 2;

        projectiles[i].y = -50;

        points++;

      }

    }

  }

}

​

function projectileBossCollision() {

  for (var i = 0; i < projectiles.length; i++) {

    for (var j = 0; j < bosses.length; j++) {

      let D = dist(

        projectiles[i].x,

        projectiles[i].y,

        bosses[j].x,

        bosses[j].y

      );

      if (D < 15 + 5) {

        fill(20, 20, 20);

        rect(0, 0, width, height);

        if (bosses[j].health > 0) {

          projectiles[i].y = -50;

          bosses[j].health--;

          points++;

        } else {

          projectiles[i].y = -50;

          bosses[j].x = 900;

          points += 5;

        }

      }

    }

  }

}

​

function draw() {

  screenItems();

​

  nebuchadnezzar.show();

  nebuchadnezzar.healthBar();

​

  bosses.map(b => {

    b.show();

    b.move();

    b.makeB();

    b.dropB();

    b.hitB();

  });

​

  enemies.map(e => {

    e.showEnemy();

    e.moveEnemy();

    e && e.crash();

  });

​

  moveProjectile();

  projectileBossCollision();

  projectileCollision();

}

​

function keyPressed() {

  if (keyCode === 39 && nebuchadnezzar.x < 540) {

    nebuchadnezzar.x = nebuchadnezzar.x + 40;

  }

  if (keyCode === 37 && nebuchadnezzar.x > 30) {

    nebuchadnezzar.x = nebuchadnezzar.x - 40;

  }

}

​

function keyReleased() {

  if (keyCode === 38) {

    projectiles.push(new Projectile(nebuchadnezzar.x, 370));

  }

}