​

// THE GAME OBJECTS

​

// ---santa class---

class Santa {

  constructor() {

    this.x = width / 2;

    this.y = height - 100;

    this.w = santaWidth;

    this.h = santaHeight;

    this.moving = false;

    this.idleFrame = 2;

    this.speed = santaSpeed;

    this.facingRight = true;

    this.health = santaHealth;

  }

​

  move() {

    if (keyIsDown(LEFT_ARROW)) {

      this.x -= this.speed;

      this.moving = true;

      this.facingRight = false;

    } else if (keyIsDown(RIGHT_ARROW)) {

      this.x += this.speed;

      this.moving = true;

      this.facingRight = true;

    } else {

      this.moving = false;

    }

​

    // constrain to the size of canvas

    this.x = constrain(this.x, 0, width - this.w);

​

    // itirating through the sprite

    if (this.moving && frameCount % 8 === 0) {

      this.idleFrame = (this.idleFrame + 1) % 3;

    } else if (this.moving === false) {

      this.idleFrame = 2; // set back to idle when not moving

    }

  }

​

  display() {

    push();

    if (!this.facingRight) {

      translate(this.x + this.w, this.y); // utilizing translate and scale to mirror the santa image

      scale(-1, 1);

      image(santaSprite, 0, 0, this.w, this.h, this.idleFrame * santaWidth, 0, santaWidth, santaHeight);

    } else {

      image(santaSprite, this.x, this.y, this.w, this.h, this.idleFrame * santaWidth, 0, santaWidth, santaHeight);

    }

    pop();

  }

}

​

// ---santa---

let santa;

let santaWidth = 49; 

let santaHeight = 47; 

let santaSpeed = 5;

let santaHealth = 3; // healthbar - 3 candies

let santaSprite;

​

// ---gifts---

let gifts = []; 

let giftWidth = 30;

let giftHeight = 27;

let giftFrequency = 100;  // how frequent the gifts will spawn

let giftCounter = 0;  // counting how many gifts caught

let giftToWin = 15;  // winning condition

let giftSprite;

let giftCollectedSound;

​

// ---candies---

let candySprite;

​

// ---icicles---

let icicles = [];

let icicleWidth = 30;

let icicleHeight = 50;

let icicleFrequency = 20; // frequency of icicles

let icicleHitSound; // if hits santa

let icicleSprite;

​

// THE GAME SETTINGS

let gameStarted = false;

let jingleBellsMusic;

let gameOver = false;

let gameOverSoundCharged = true; 

let gameOverSound;

let gameWon = false; 

let gameWonSoundCharged = true;

let gameWonSound;

​

function preload() {

  jingleBellsMusic = loadSound('jingleBellsMusic.mp3');

  santaSprite = loadImage('santaSpriteSheet.png');

  giftSprite = loadImage('giftsSpriteSheet.png');  

  icicleSprite = loadImage('icicleSpriteSheet.png');  

  candySprite = loadImage('healthbarSpriteSheet.png'); 

  icicleHitSound = loadSound('icicleHitSound.mp3');

  giftCollectedSound = loadSound('giftCollectedSound.mp3');

  gameOverSound = loadSound('gameOverSound.mp3');

  gameWonSound = loadSound('gameWonSound.mp3');

}

​

function setup() {

  jingleBellsMusic.setLoop(true);

  jingleBellsMusic.play();

  createCanvas(600, 700);

​

  // initialize santa

  santa = new Santa();

}

​

function draw() {

  if (!gameStarted) {

    displayRulesScreen();  // rules

  } else if (gameOver) {

    displayGameOverScreen(); //game over

  } else if (gameWon) {

    displayWinScreen(); // win

  } else {

    playGame(); // game state

  }

}

​

// defining rules

function displayRulesScreen() {

  background('rgb(0,147,255)'); 

  fill('white');

  noStroke();

  rect(0, 600 + santaHeight, 600, 100);

  textAlign(CENTER, CENTER);

  fill(255);

  textSize(48);

  text("HELP THE SANTA!", 300, 100);

​

  textSize(35);

  fill('red');

  text("Rules:", 300, 250);

  textSize(18);

  fill('white');

  text("Christmas is coming! Your goal is simple - collect 15 gifts", 300, 300);

  text("Beware of icicles that are flying from the sky!", 300, 350);

  text("Use LEFT and RIGHT arrow keys to move Santa and dodge icicles", 300, 400);

  text("You have only 3 candy-health-points. Once they're gone, you lose", 300, 450);

​

  textSize(28);

  text("Press ENTER to Start", 300, 550);

}

​

// game state

function playGame() {

  background(0, 147, 255);

  fill('white');

  noStroke();

  rect(0, 600 + santaHeight, 600, 100);

  // gift counter

  fill(255);

  textSize(32);

  text("Gifts: " + giftCounter, 65, 35);

​

  // displaying candies as health

  displayHealth();

​

  // launch santa

  santa.move();

  santa.display();

​

  // launch gifts

  if (frameCount % giftFrequency === 0) {

    gifts.push(createGift());

  }

​

  // launch icicles

  if (frameCount % icicleFrequency === 0) {

    icicles.push(createIcicle());

  }

​

  // updating gifts state

  for (let i = gifts.length - 1; i >= 0; i--) {

    let gift = gifts[i];

    gift.y += gift.speed;

​

    // sprite for gift

    image(giftSprite, gift.x, gift.y, giftWidth, giftHeight, gift.frame * giftWidth, 0, giftWidth, giftHeight);

​

    // collision detection for gifts

    if (checkCollision(gift.x, gift.y, giftWidth, giftHeight)) {

      giftCollectedSound.play();

      gifts.splice(i, 1);  // Remove the gift

      giftCounter++;  // Increment the gift counter

​

      // winning condition

      if (giftCounter >= giftToWin) {

        gameWon = true;

        if (gameWonSoundCharged) {

          gameWonSound.play();

          gameWonSoundCharged = false;

        }

      }

    }

​

    // deleting the gifts that are out of the borders

    if (gift.y > 600 + santaHeight - giftHeight) {

      gifts.splice(i, 1);

    }

  }

​

  // updating icicles

  for (let i = icicles.length - 1; i >= 0; i--) {

    let icicle = icicles[i];

    icicle.y += icicle.speed;

​

    // sprite for icicles

    image(icicleSprite, icicle.x, icicle.y, icicleWidth, icicleHeight);

​

    // collision detection for icicles

    if (checkCollision(icicle.x, icicle.y, icicleWidth, icicleHeight)) {

      icicleHitSound.play();

      icicles.splice(i, 1);  // removing from the array

      santa.health -= 1;  // decreasing health by 1

      if (santa.health <= 0) {

        gameOver = true;  // game over condition

        if (gameOverSoundCharged) {

          gameOverSound.play();

          gameOverSoundCharged = false; // setting to false to not repeat infinitely many times

        }

      }

    }

​

    // deleting icicles if out of border

    if (icicle.y > 600 + santaHeight - icicleHeight) {

      icicles.splice(i, 1);

    }

  }

}

​

// game over screen function

function displayGameOverScreen() {

  jingleBellsMusic.stop();

  background(0, 147, 255);  // Blue sky

  fill('white');

  noStroke();

  rect(0, 600 + santaHeight, 600, 100);

  textAlign(CENTER, CENTER);

  fill(255);

  textSize(70);

  text("GAME OVER", 300, 350);

  textSize(35);

  text("Press Enter to Restart", 300, 450);

}

​

// win screen function

function displayWinScreen() {

  jingleBellsMusic.stop();

  background(0, 147, 255); 

  fill('white');

  noStroke();

  rect(0, 600 + santaHeight, 600, 100);

  textAlign(CENTER, CENTER);

  fill(255);

  textSize(70);

  text("YOU WON!", 300, 350);

  textSize(35);

  text("Press Enter to Restart", 300, 450);

}

​

// simple collision detection with santa being inside the box with boundaries

function checkCollision(objX, objY, objW, objH) {

  return objY + objH > santa.y && objX + objW > santa.x && objX < santa.x + santa.w;

}

​

// health as candies - one sprite that contains three of them, very simple 

function displayHealth() {

  let candyX = width - 190;

  let candyWidth = 51;

  let candyHeight = 41;

  for (let i = 0; i < santa.health; i++) {

    image(candySprite, candyX + i * (candyWidth + 10), 10, candyWidth, candyHeight, i * candyWidth, 0, candyWidth, candyHeight);

  }

}

​

// gift creator

function createGift() {

  return {

    x: random(giftWidth, width - giftWidth),

    y: 0,

    speed: random(2, 4),

    frame: floor(random(0, 3))  // randomly select the gift sprite part - three colors available

  };

}

​

// icicle creator

function createIcicle() {

  return {

    x: random(icicleWidth / 2, width - icicleWidth / 2),

    y: 0,

    speed: random(3, 5)

  };

}

​

// restarting the game by resetting all the variables to their initial states

function restartGame() {

  gameOver = false;

  gameWon = false;

  santa.health = 3;  // Reset health

  giftCounter = 0;  // Reset gift counter

  gifts = [];  // Clear gifts

  icicles = [];  // Clear icicles

  santa.idleFrame = 2;  // Reset to idle frame

  gameOverSoundCharged = true;

  gameWonSoundCharged = true;

  jingleBellsMusic.setLoop(true);

  jingleBellsMusic.play();

}

​

​

// using ENTER for starting and restarting the game

function keyPressed() {

  if (!gameStarted && keyCode === ENTER) {

    gameStarted = true;  // game start

  } else if (keyCode === ENTER && (gameOver || gameWon)) {

    restartGame();  // restart

  }

  // fulscreen

  if (key === 'f' || key === 'F') {

    let fs = fullscreen();

    fullscreen(!fs); 

  }

}

​