//Mayank Malhotra - 20BCE7308

//Rukhsar Rahman - 20BCE7302

//Swetha Sree J.A - 20BCE7299

//R.Soundarya - 20BCE7307

​

let mr_alien;

let space;

let start_screen;

let game_over;

let scrollSpeed = 2;

let x1 = 0,x2;

let start = 0;

function preload() {

// Loading the Images

  mr_alien = loadImage("mr_alien.png");

  space = loadImage("starry_night.jpg");

  start_screen = loadImage("start_screen.jpeg");

  game_over = loadImage("game_over.jpeg");

}

​

​

​

function Alien() {

  //Setting up the Alien and Its movement

  this.y = height / 2;

  this.x = 45;

  this.gravity = 0.4; // Alien Falling Speed

  this.velocity = 0;

  this.lift = -10;

  this.show = function () {

    image(mr_alien, this.x, this.y, 70, 70);

  };

  this.update = function () {

    this.velocity += this.gravity; // Alien falling Down

    this.velocity *= 0.9;

    this.y += this.velocity;

    if (this.y > height) {

      this.y = height;

      this.velocity = 0;

    }

    if (this.y < 0) {

    this.y = 0;

    this.velocity = 0;

    }

  };

​

​

​

  this.fly = function () {

    // Lifting Alien On a Mouse Click

    this.velocity += this.lift;

  };

}

​

​

​

function Pillar() {

  //Function For Obstacles

  this.top = random(20, height / 2); // Generating top Randomly

  this.bottom = random(this.top + 85, height - 20); // Generating Bottom Randomly

  this.x = width;

  this.speed = 7;

​

​

​

  this.show = function () {

    // Displaying Pillars

    fill(255, 204, 0);

    rect(this.x, 0, 20, this.top);

    rect(this.x, this.bottom, 20, height - this.bottom);

  };

​

​

​

  this.update = function () {

    this.x -= this.speed;

  };

​

​

​

  this.collision = function (spaceship) {

    // Function To check the Collision

    if (spaceship.y < this.top || spaceship.y > this.bottom) {

      if (spaceship.x > this.x && spaceship.x < this.x + 20)

        return true;

    }

  }

}

​

​

​

let spaceship;

let pillars = [];

​

​

​

function setup() {

  createCanvas(400, 600); // Creating the canvas

  spaceship = new Alien();

  pillars.push(new Pillar()); // Generating new pillars

  x2 = width;

}

​

​

​

function draw() {

  if (start == 0) {

    fill(0, 0, 255);

    image(start_screen, 0, 0, width, height);

  }

  if (start == 1) {

    scrollyBackground(); // Scrolling the background backwards

    spaceship.update();

    spaceship.show();

    textSize(20);

    fill(255);

    text("Score: " + (pillars.length - 1), 310, 30);

    if (frameCount % 80 == 0) {

      pillars.push(new Pillar());

    }

    for (let i = 0; i < pillars.length; i++) {

      pillars[i].show();

      pillars[i].update();

      if (pillars[i].collision(spaceship)) {

      image(game_over, 0, 0, width, height);

      textSize(25);

      text("Score: " + (pillars.length - 1), width / 2 - 45, 500);

      noLoop();

      }

    }

  }

}

​

​

​

function keyPressed() {

  // On Key pressed Flying the alien

  if (key == " ") {

    spaceship.fly();

  }

}

​

​

​

function scrollyBackground() {

  image(space, x1, 0, width, height);

  image(space, x2, 0, width, height);

  x1 -= scrollSpeed;

  x2 -= scrollSpeed;

  if (x1 < -width) {

    x1 = width;

  }

  if (x2 < -width) {

    x2 = width;

  }

}

​

​

​

function mouseClicked() {

  start = 1;

}