let font;

let stage = 0;

let not_started = true;

let stages = ["Title", "Instructions1", "Instructions2", "Game", "GameOver"];

let numStages = 4;

let sessionTimer;

let gameTimer;

let gameTimerEnd;

let timeofLastDeath = 0;

let numLives = 4;

let numBacteria = 5;

let score = 0;

​

//Lists

let bacteria = [];

let lives = [];

let bullets = [];

let boosts = [];

let nets = [];

let bombs = [];

​

//White Blood Cell Properties

let wbx;

let wby;

let wbr;

​

//Bacteria Properties

let bx;

let by;

let br;

let bspeed;

let speedfactor = 1;

​

//Bullet Properties

let bulletx;

let bullety;

let bulletr;

let bulletspeed;

let numBullets = 1;

​

//Powerup #1 - Vitamin Boost (Produce more antibody bullets) (Z)

let boostcost = 15;

let boosttime = 10;

let boostfactor = 3;

let lastboosttime;

let booststartscore = -15;

let maxboosts = 5;

let boosticonx;

let boosticony;

let boosticonw;

​

//Powerup #2 - Neutrophil Extracellular Trap (Slows down all bacteria) (X)

let netcost = 20;

let nettime = 10;

let netfactor = 0.5;

let lastnettime;

let netstartscore = -20;

let maxnets = 5;

let neticonx;

let neticony;

let neticonw;

​

//Powerup #3 - Complement Bomb (Clears Screen of all Bacteria) (C)

let bombcost = 40;

let bombtime = 20;

let lastbombtime;

let bombstartscore = -30;

let maxbombs = 2;

let bombiconx;

let bombicony;

let bombiconw;

​

//Colors

let restartbuttoncolor = "green";

let titlebuttoncolor = "mediumorchid";

let buttonhovercolor = "rgba(237,20,61,0.5)";

​

//Buttons

let restartbutton;

let titlebutton;

​

//images

let titleimg;

let bgimg = [];

let bgy = 0;

let wbcsprite;

let bacspritesheet;

let bacsprites = [];

let bulletsprite;

let boosticon;

let neticon;

let bombicon;

​

//sounds+music

let titleMusic;

let gametheme;

let ecg;

let ecgPlayed = false;

let shotsound;

​

function preload() {

  font = loadFont("assets/fonts/ConcertOne-Regular.ttf");

  //icons and sprites

  boosticon = loadImage("assets/images/boost.png");

  neticon = loadImage("assets/images/net.png");

  bombicon = loadImage("assets/images/bomb.png");

  wbcsprite = loadImage("assets/images/wbc.png");

  bacspritesheet = loadImage("assets/images/bacteria.png");

  bulletsprite = loadImage("assets/images/antibody.png");

  //backgrounds

  titleimg = loadImage("assets/images/dalle.jpg")

  bgimg = [loadImage("assets/images/capillary.png"), loadImage("assets/images/capillary.png")];

  //music+sound

  titleMusic = loadSound("assets/sound/title.mp3")

  gametheme = loadSound("assets/sound/gametheme.mp3")

  shot = loadSound("assets/sound/laser.mp3");

  ecg = loadSound("assets/sound/ekg.mp3");

  //Sanity Check

  console.log("Assets Preloaded Successfully");

}

​

function setup() {

  cnv = createCanvas(windowWidth, windowHeight);

  sessionTimer = millis();

  textFont(font);

  for (let x = 0; x < 2; x++){

    bacsprites[x] = bacspritesheet.get(x * bacspritesheet.width / 2, 0, bacspritesheet.width/2, bacspritesheet.height);

  }

}

​

function draw() {

  // check if player has lives

  if (stages[stage] == "Title") {

    drawTitle();

  } else if (

    stages[stage] == "Instructions1" ||

    stages[stage] == "Instructions2"

  ) {

    drawInstructions();

  } else if (stages[stage] == "Game") {

    drawGame();

  } else if (stages[stage] == "GameOver") {

    drawGameOver();

  }

}

​

// Reset Game State

function reset() {

  score = 0;

  gameTimer = millis();

  frameStart = 0;

  gameOver = false;

  bacteria = [];

  lives = [];

  bullets = [];

  boosts = [];

  nets = [];

  bombs = [];

  speedfactor = 1;

  lastboosttime = gameTimer;

  booststartscore = -15;

  lastnettime = gameTimer;

  netstartscore = -20;

  lastbombtime = gameTimer;

  bombstartscore = -30;

  boosticonx = (11 / 12) * width;

  boosticony = (1 / 4) * height;

  boosticonw = (1 / 8) * height;

  neticonx = (11 / 12) * width;

  neticony = (2 / 4) * height;

  neticonw = (1 / 8) * height;

  bombiconx = (11 / 12) * width;

  bombicony = (3 / 4) * height;

  bombiconw = (1 / 8) * height;

  var boost = new Boost(

    boostfactor,

    boosttime,

    boosticonx,

    boosticony,

    boosticonw,

    boosticon

  );

  boosts.push(boost);

  var net = new Net(netfactor, nettime, neticonx, neticony, neticonw, neticon);

  nets.push(net);

  var bomb = new Bomb(bombtime, bombiconx, bombicony, bombiconw, bombicon);

  bombs.push(bomb);

  wbx = 5 / 12 * width;

  wby = height - height / 10;

  wbr = height / 15;

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

    var immune = new ImmuneCell(wbx, wby, wbr, wbcsprite);

    lives.push(immune);

  }

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

    bx = int(random((2 * width) / 15, (5 / 6) * width - (2 * width) / 15));

    by = -height / 40;

    br = height / 40;

    bspeed = int(speedfactor * random(height / 400, height / 200));

    var bacGen = new Bacteria(bx, by, br, bspeed, bacsprites);

    bacteria.push(bacGen);

  }

  frameofLastDeath = 0;

  ecgPlayed = false;

}

​

// Trigger game state change on mouse click

function mousePressed() {

  if (stages[stage] != "Game" && stages[stage] != "GameOver") {

    stage = (stage + 1) % 5;

  }

​

  //reset after completing instructions

  if (stages[stage] == "Game" && (millis()-gameTimer < 100 || not_started)) {

    reset();

    not_started = false;

  }

}

​

function keyPressed() {

  if (stages[stage] == "Game") {

    //SPACEBAR

    if (keyCode == 32) {

      shot.play();

      if (int((millis() - lastboosttime) / 1000) > boosttime) {

        numBullets = 1;

      }

      for (let i = 1; i <= numBullets; i++) {

        bulletx =

          lives[0].x +

          lives[0].r * 0.25 * (-2 * pow(-1, i) * i + pow(-1, i) - 1);

        bullety = lives[0].y;

        bulletr = height / 100;

        bulletspeed = height / 20;

        var bullet = new Bullet(

          bulletx,

          bullety,

          bulletr,

          bulletspeed,

          bulletsprite

        );

        bullets.push(bullet);

      }

    }

    //Z

    if (keyCode == 90) {

      if (boosts.length > 1) {

        if (int((millis() - lastboosttime) / 1000) > boosttime) {

          numBullets = boostfactor;

          lastboosttime = millis();

          boosts.pop();

        }

      }

    }

    //X

    if (keyCode == 88) {

      if (nets.length > 1) {

        if (int((millis() - lastnettime) / 1000) > nettime) {

          speedfactor = netfactor;

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

            bacteria[i].moveY = max(height/400, speedfactor * bacteria[i].moveY);

          }

          lastnettime = millis();

          nets.pop();

        }

      }

    }

  }

  //C

  if (keyCode == 67) {

    if (bombs.length > 1) {

      if (int((millis() - lastbombtime) / 1000) > bombtime) {

        score += bacteria.length;

        bacteria = [];

        lastbombtime = millis();

        bombs.pop();

      }

    }

  }

}

​

//Title Screen

function drawTitle() {

  ecg.stop();

  clear();

  imageMode(CENTER);

  image(titleimg, width/2, height/2, min(3*height/4, 2*width/3), 2*height/3);

  textSize(48);

  textAlign(CENTER, CENTER);

  fill("green");

  text("IMMUNE DEFENDERS!", width / 2, height / 10);

  fill("midnightblue");

  textSize(24);

  text("Click anywhere to continue", width / 2, (9 * height) / 10);

  //Music

  if (!titleMusic.isPlaying()){

    titleMusic.playMode("restart");

    titleMusic.setVolume(1);

    titleMusic.play();

    titleMusic.setLoop(true);

  }

}

​

//Instructions Panel

function drawInstructions() {

  ecg.stop();

  clear();

  if (stages[stage] == "Instructions1") {

    textAlign(CENTER, CENTER);

    fill("black");

    textSize(36);

    text("MISSION BREIFING", width / 2, height / 10);

    textSize(24);

    text("B-Cell Recruit #742, report for duty!\nThe body is under attack by invasive bacteria,\nand only you have the right antibodies!\n You need to do your duty as a Plasma Cell right now!\nNot to worry, you have the latest technology to assist you.\n\n\nUse Arrow or 'A' and 'D' keys to move the white blood cell.\nUse SPACEBAR to shoot antibodies to collect antigen points.\nAntigen Points can be used to gain special abilities in battle.\nYour goal is to survive as long as possible,\nuntil reinforcements arrive.", width/2, height/2)

    text("Click to Continue", width/2, 9*height/10);

  } else if (stages[stage] == "Instructions2") {

    textSize(24);

    textAlign(CENTER, CENTER);

    fill("black");

    text("Use the Z key to activate a Vitamin C boost,\nwhich allows you to shoot more antibodies in one go.\nThis move costs 15 antigens, and the effect lasts for\n10 seconds.\n\n\nUse the X key to activate Neutrophil Extracellular Traps (NETs)\nthat can slow bacteria down.\nThis move costs 20 antigens, and the effect lasts for\n10 seconds.\n\n\nUse the C key to activate Complement Bomb,\nwhich eliminates all bacteria currently on the screen\nin a finishing move.\nThis killer move costs 30 antigens, and has a cooldown\nof 20 seconds.", width / 2, height / 2);

  }

}

​

//Game screen

function drawGame() {

  ecg.stop();

  titleMusic.stop();

  clear();

  background("firebrick");

  imageMode(CORNER);

  tint (255, 255);

  image(bgimg[0], 0, bgy, 5/6 * width, height);

  image(bgimg[1], 0, -height+bgy, 5/6 * width, height);

  bgy = (bgy + 1) % height

  // diplay, movement, collision of bacteria

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

    bacteria[i].display();

    bacteria[i].move();

    // invincibility frames

    if (millis() - timeofLastDeath > 1500) {

      // bacteria dying on contact with cell

      if (bacteria[i].collide(lives[0])) {

        bacteria.splice(i, 1);

        //immune cell dying on contact (if more than 1 life left)

        if (lives.length > 1) {

          lives.splice(0, 1);

        } else {

          gameTimerEnd = int((millis() - gameTimer) / 1000);

          stage = 4;

        }

        timeofLastDeath = millis();

      }

    }

  }

​

  // check when bacteria leave the screen (separate loop for logic purpose)

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

    if (bacteria[i].wallCollide()) {

      bacteria.splice(i, 1);

    }

  }

​

  // immune cell display and indication of i-frames

  if (millis() - timeofLastDeath > 1500) {

    lives[0].display(255);

  } else {

    lives[0].display(0.6 * 255);

  }

​

  //bullet display,, movement and collision

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

    bullets[i].display();

    bullets[i].move();

    //Delete bullet and bacterium, and add score when killing bacteria

    for (let j = 0; j < bacteria.length; j++) {

      if (bullets.length > i) {

        //length condition added as parameter changes before draw() function is next called

        if (bullets[i].collide(bacteria[j])) {

          bullets.splice(i, 1);

          bacteria.splice(j, 1);

          score++;

        }

      }

    }

    //Delete when bullets fly off-screen

    if (bullets.length > i) {

      //length condition added as parameter changes before draw() function is next called

      if (bullets[i].wallCollide()) {

        bullets.splice(i, 1);

      }

    }

  }

​

  //immune cell movement control

  if (keyIsDown(LEFT_ARROW) || keyIsDown(65)) {

    if (lives[0].x > (2 * width) / 15) {

      lives[0].x -= 10;

    }

  }

  if (keyIsDown(RIGHT_ARROW) || keyIsDown(68)) {

    if (lives[0].x < (5 / 6) * width - (2 * width) / 15) {

      lives[0].x += 10;

    }

  }

  if ((frameCount - frameStart) % 120 == 0) {

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

      bx = int(random((2 * width) / 15, (5 / 6) * width - (2 * width) / 15));

      by = -height / 40;

      br = height / 40;

      bspeed = int(speedfactor * random(height / 400, height / 200));

      var bacGen = new Bacteria(bx, by, br, bspeed, bacsprites);

      bacteria.push(bacGen);

    }

  }

​

  //Score Display

  textAlign(LEFT, CENTER);

  textSize(16);

  fill(255);

  text("Antigens: " + score, 2*width / 20, height / 10);

​

  //Lives Display

  textAlign(LEFT, CENTER);

  textSize(16);

  fill(255);

  text("Lives Remaining: " + lives.length, 2*width / 20, height / 20);

​

  //Game Timer

  textAlign(RIGHT, CENTER);

  textSize(16);

  fill(255);

  text(

    "Time Survived: " + str(int((millis() - gameTimer) / 1000)),

    (99 * width) / 100,

    height / 20

  );

​

  //Powerups

  //Boost Powerup

  if (boosts.length <= maxboosts && score - booststartscore >= boostcost) {

    var boost = new Boost(

      boostfactor,

      boosttime,

      boosticonx,

      boosticony,

      boosticonw,

      boosticon

    );

    boosts.push(boost);

    booststartscore = score;

  }

  if (boosts.length > 0) {

    boosts[0].display(boosts.length - 1);

    if (int((millis() - lastboosttime) / 1000) < boosttime) {

      boosts[0].update(boosttime - int((millis() - lastboosttime) / 1000));

    }

  }

  //Net Powerup

  if (nets.length <= maxnets && score - netstartscore >= netcost) {

    var net = new Net(

      netfactor,

      nettime,

      neticonx,

      neticony,

      neticonw,

      neticon

    );

    nets.push(net);

    netstartscore = score;

  }

  if (nets.length > 0) {

    nets[0].display(nets.length - 1);

    if (int((millis() - lastnettime) / 1000) < nettime) {

      nets[0].update(nettime - int((millis() - lastnettime) / 1000));

    } else {

      speedfactor = 1;

    }

  }

  //Bomb Powerup

  if (bombs.length <= maxbombs && score - bombstartscore >= bombcost) {

    var bomb = new Bomb(bombtime, bombiconx, bombicony, bombiconw, bombicon);

    bombs.push(bomb);

    bombstartscore = score;

  }

  if (bombs.length > 0) {

    bombs[0].display(bombs.length - 1);

    if (int((millis() - lastbombtime) / 1000) < bombtime) {

      bombs[0].update(bombtime - int((millis() - lastbombtime) / 1000));

    }

  }

  //Music

  if (!gametheme.isPlaying()){

    gametheme.playMode("restart");

    gametheme.setVolume(0.3);

    gametheme.play();

    gametheme.setLoop(true);

  }

}

​

//Game Over Screen

function drawGameOver() {

  gametheme.stop()

  if (!ecg.isPlaying() && !ecgPlayed){

    ecg.playMode("restart");

    ecg.play();

    ecg.setLoop(false);

    ecgPlayed = true;

  }

  textFont(font);

  fill("khaki");

  background(0);

  textSize(48);

  textAlign(CENTER, CENTER);

  rectMode(CENTER);

  text("GAME OVER", width / 2, (9 * height) / 20);

  textSize(24);

  text("\nYou survived " + gameTimerEnd + " seconds", width / 2, height / 2);

  text("\n\n\nYou earned " + score + " antigens", width / 2, height / 2);

  //Restart Button

  restartbutton = new Button(

    "Restart",

    width / 4,

    (7 * height) / 10,

    width / 5,

    height / 20,

    width / 100,

    restartbuttoncolor,

    buttonhovercolor

  );

  restartbutton.hover();

  restartbutton.display();

  restartbutton.click(3);

  //Title Screen Button

  titlebutton = new Button(

    "Title Screen",

    (3 * width) / 4,

    (7 * height) / 10,

    width / 5,

    height / 20,

    width / 100,

    titlebuttoncolor,

    buttonhovercolor

  );

  titlebutton.hover();

  titlebutton.display();

  titlebutton.click(0);

}

​