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    How to make Glowing Snake Game using HTML CSS & JavaScript

    Coding StellaBy No Comments10 Mins Read

    Let’s create a Glowing Snake Game using HTML, CSS, and JavaScript. This project will feature a classic snake game with a modern twist: a glowing effect to make it visually appealing.

    We’ll use HTML to structure the game, CSS to style it and add the glowing effect, and JavaScript to handle the game logic.

    Let’s get started on building the Glowing Snake Game. Whether you’re a beginner or an experienced developer, this project offers a fun and interactive way to practice your web development skills and create an engaging game. Let’s bring some glow to the classic snake game!

    HTML :

    This HTML code sets up a simple webpage for a vanilla JavaScript snake game. It includes a linked CSS file (style.css) for styling and a JavaScript file (script.js) for functionality. The page contains a button to restart the game and a section to display the score. Font Awesome icons are used for the button icon, and the game will likely be displayed inside the #canvas div. The defer attribute on the script tags ensures that the JavaScript is executed after the HTML is loaded.

    <!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
  <title>Vanilla JS Snake</title>

  <script defer src="https://pro.fontawesome.com/releases/v5.10.0/js/all.js"
        integrity="sha384-G/ZR3ntz68JZrH4pfPJyRbjW+c0+ojii5f+GYiYwldYU69A+Ejat6yIfLSxljXxD"
        crossorigin="anonymous"></script>

  <link rel="stylesheet" href="./style.css">

</head>
<body>

  <div class="container noselect">
    <div class="wrapper">
      <button id="replay">
        <i class="fas fa-play"></i>
        RESTART
      </button>
      <div id="canvas">
  
      </div>
      <div id="ui">
        <h2>SCORE
        </h2>
        <span id="score">00</span>
      </div>
    </div>
  </div>

  <script  src="./script.js"></script>

</body>
</html>

    CSS :

    This CSS code styles a webpage for a simple game interface. It defines a custom font from Google Fonts called “Poppins,” sets a dark background, and styles various elements like the button, score display, and canvas. The layout is designed to be flexible and centered using flexbox, with elements like the replay button and score rotated for a unique look. There are hover effects on the button and responsive adjustments for screens narrower than 600px. This ensures that the layout remains clean and accessible on smaller devices.

    @font-face {
  font-family: "game";
  src: url("https://fonts.googleapis.com/css2?family=Poppins:wght@500;800&display=swap");
}

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

button:focus {
  outline: 0;
}

html,
body {
  height: 100%;
  font-family: "Poppins", sans-serif;
  color: #6e7888;
}

body {
  background-color: #222738;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #6e7888;
}

.wrapper {
  display: flex;
  flex-flow: row wrap;
  justify-content: center;
  align-items: center;
  margin-bottom: 20px;
}

canvas {
  background-color: #181825;
}

.container {
  display: flex;
  width: 100%;
  height: 100%;
  flex-flow: column wrap;
  justify-content: center;
  align-items: center;
}

#ui {
  display: flex;
  align-items: center;
  font-size: 10px;
  flex-flow: column;
  margin-left: 10px;
}

h2 {
  font-weight: 900;
  font-size: 10px;
  letter-spacing: 8px;
  margin-bottom: 30px;
  transform: rotate(270deg);
}

#score {
  margin-top: 20px;
  font-size: 30px;
  font-weight: 800;
  transform: rotate(-90deg);
}

.noselect {
  user-select: none;
}

#replay {
  font-size: 10px;
  padding: 10px 20px;
  background: #6e7888;
  border: none;
  color: #222738;
  border-radius: 40px;
  font-weight: 800;
  transform: rotate(270deg);
  cursor: pointer;
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
}
#replay:hover {
  background: #a6aab5;
  background: #4cffd7;
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
}
#replay svg {
  margin-right: 8px;
}

@media (max-width: 600px) {
  #replay {
    margin-bottom: 20px;
  }
  #replay,
  h2 {
    transform: rotate(0deg);
  }
  #ui {
    flex-flow: row wrap;
    margin-bottom: 20px;
  }
  #score {
    margin-top: 0;
    margin-left: 20px;
  }
  .container {
    flex-flow: column wrap;
  }
}

    JavaScript:

    This JavaScript code is for a simple snake game using the HTML canvas. It sets up the game board and initializes a snake that moves based on arrow key inputs. The snake grows when it “eats” food, which spawns randomly on the grid. If the snake collides with itself or the walls, the game ends. The score is updated each time the snake eats food, and the maximum score is saved in local storage. The game also includes a particle effect that triggers when the snake eats food. A “restart” button allows players to reset and start the game again.

    let dom_replay = document.querySelector("#replay");
let dom_score = document.querySelector("#score");
let dom_canvas = document.createElement("canvas");
document.querySelector("#canvas").appendChild(dom_canvas);
let CTX = dom_canvas.getContext("2d");

const W = (dom_canvas.width = 400);
const H = (dom_canvas.height = 400);

let snake,
  food,
  currentHue,
  cells = 20,
  cellSize,
  isGameOver = false,
  tails = [],
  score = 00,
  maxScore = window.localStorage.getItem("maxScore") || undefined,
  particles = [],
  splashingParticleCount = 20,
  cellsCount,
  requestID;

let helpers = {
  Vec: class {
    constructor(x, y) {
      this.x = x;
      this.y = y;
    }
    add(v) {
      this.x += v.x;
      this.y += v.y;
      return this;
    }
    mult(v) {
      if (v instanceof helpers.Vec) {
        this.x *= v.x;
        this.y *= v.y;
        return this;
      } else {
        this.x *= v;
        this.y *= v;
        return this;
      }
    }
  },
  isCollision(v1, v2) {
    return v1.x == v2.x && v1.y == v2.y;
  },
  garbageCollector() {
    for (let i = 0; i < particles.length; i++) {
      if (particles[i].size <= 0) {
        particles.splice(i, 1);
      }
    }
  },
  drawGrid() {
    CTX.lineWidth = 1.1;
    CTX.strokeStyle = "#232332";
    CTX.shadowBlur = 0;
    for (let i = 1; i < cells; i++) {
      let f = (W / cells) * i;
      CTX.beginPath();
      CTX.moveTo(f, 0);
      CTX.lineTo(f, H);
      CTX.stroke();
      CTX.beginPath();
      CTX.moveTo(0, f);
      CTX.lineTo(W, f);
      CTX.stroke();
      CTX.closePath();
    }
  },
  randHue() {
    return ~~(Math.random() * 360);
  },
  hsl2rgb(hue, saturation, lightness) {
    if (hue == undefined) {
      return [0, 0, 0];
    }
    var chroma = (1 - Math.abs(2 * lightness - 1)) * saturation;
    var huePrime = hue / 60;
    var secondComponent = chroma * (1 - Math.abs((huePrime % 2) - 1));

    huePrime = ~~huePrime;
    var red;
    var green;
    var blue;

    if (huePrime === 0) {
      red = chroma;
      green = secondComponent;
      blue = 0;
    } else if (huePrime === 1) {
      red = secondComponent;
      green = chroma;
      blue = 0;
    } else if (huePrime === 2) {
      red = 0;
      green = chroma;
      blue = secondComponent;
    } else if (huePrime === 3) {
      red = 0;
      green = secondComponent;
      blue = chroma;
    } else if (huePrime === 4) {
      red = secondComponent;
      green = 0;
      blue = chroma;
    } else if (huePrime === 5) {
      red = chroma;
      green = 0;
      blue = secondComponent;
    }

    var lightnessAdjustment = lightness - chroma / 2;
    red += lightnessAdjustment;
    green += lightnessAdjustment;
    blue += lightnessAdjustment;

    return [
      Math.round(red * 255),
      Math.round(green * 255),
      Math.round(blue * 255)
    ];
  },
  lerp(start, end, t) {
    return start * (1 - t) + end * t;
  }
};

let KEY = {
  ArrowUp: false,
  ArrowRight: false,
  ArrowDown: false,
  ArrowLeft: false,
  resetState() {
    this.ArrowUp = false;
    this.ArrowRight = false;
    this.ArrowDown = false;
    this.ArrowLeft = false;
  },
  listen() {
    addEventListener(
      "keydown",
      (e) => {
        if (e.key === "ArrowUp" && this.ArrowDown) return;
        if (e.key === "ArrowDown" && this.ArrowUp) return;
        if (e.key === "ArrowLeft" && this.ArrowRight) return;
        if (e.key === "ArrowRight" && this.ArrowLeft) return;
        this[e.key] = true;
        Object.keys(this)
          .filter((f) => f !== e.key && f !== "listen" && f !== "resetState")
          .forEach((k) => {
            this[k] = false;
          });
      },
      false
    );
  }
};

class Snake {
  constructor(i, type) {
    this.pos = new helpers.Vec(W / 2, H / 2);
    this.dir = new helpers.Vec(0, 0);
    this.type = type;
    this.index = i;
    this.delay = 5;
    this.size = W / cells;
    this.color = "white";
    this.history = [];
    this.total = 1;
  }
  draw() {
    let { x, y } = this.pos;
    CTX.fillStyle = this.color;
    CTX.shadowBlur = 20;
    CTX.shadowColor = "rgba(255,255,255,.3 )";
    CTX.fillRect(x, y, this.size, this.size);
    CTX.shadowBlur = 0;
    if (this.total >= 2) {
      for (let i = 0; i < this.history.length - 1; i++) {
        let { x, y } = this.history[i];
        CTX.lineWidth = 1;
        CTX.fillStyle = "rgba(225,225,225,1)";
        CTX.fillRect(x, y, this.size, this.size);
      }
    }
  }
  walls() {
    let { x, y } = this.pos;
    if (x + cellSize > W) {
      this.pos.x = 0;
    }
    if (y + cellSize > W) {
      this.pos.y = 0;
    }
    if (y < 0) {
      this.pos.y = H - cellSize;
    }
    if (x < 0) {
      this.pos.x = W - cellSize;
    }
  }
  controlls() {
    let dir = this.size;
    if (KEY.ArrowUp) {
      this.dir = new helpers.Vec(0, -dir);
    }
    if (KEY.ArrowDown) {
      this.dir = new helpers.Vec(0, dir);
    }
    if (KEY.ArrowLeft) {
      this.dir = new helpers.Vec(-dir, 0);
    }
    if (KEY.ArrowRight) {
      this.dir = new helpers.Vec(dir, 0);
    }
  }
  selfCollision() {
    for (let i = 0; i < this.history.length; i++) {
      let p = this.history[i];
      if (helpers.isCollision(this.pos, p)) {
        isGameOver = true;
      }
    }
  }
  update() {
    this.walls();
    this.draw();
    this.controlls();
    if (!this.delay--) {
      if (helpers.isCollision(this.pos, food.pos)) {
        incrementScore();
        particleSplash();
        food.spawn();
        this.total++;
      }
      this.history[this.total - 1] = new helpers.Vec(this.pos.x, this.pos.y);
      for (let i = 0; i < this.total - 1; i++) {
        this.history[i] = this.history[i + 1];
      }
      this.pos.add(this.dir);
      this.delay = 5;
      this.total > 3 ? this.selfCollision() : null;
    }
  }
}

class Food {
  constructor() {
    this.pos = new helpers.Vec(
      ~~(Math.random() * cells) * cellSize,
      ~~(Math.random() * cells) * cellSize
    );
    this.color = currentHue = `hsl(${~~(Math.random() * 360)},100%,50%)`;
    this.size = cellSize;
  }
  draw() {
    let { x, y } = this.pos;
    CTX.globalCompositeOperation = "lighter";
    CTX.shadowBlur = 20;
    CTX.shadowColor = this.color;
    CTX.fillStyle = this.color;
    CTX.fillRect(x, y, this.size, this.size);
    CTX.globalCompositeOperation = "source-over";
    CTX.shadowBlur = 0;
  }
  spawn() {
    let randX = ~~(Math.random() * cells) * this.size;
    let randY = ~~(Math.random() * cells) * this.size;
    for (let path of snake.history) {
      if (helpers.isCollision(new helpers.Vec(randX, randY), path)) {
        return this.spawn();
      }
    }
    this.color = currentHue = `hsl(${helpers.randHue()}, 100%, 50%)`;
    this.pos = new helpers.Vec(randX, randY);
  }
}

class Particle {
  constructor(pos, color, size, vel) {
    this.pos = pos;
    this.color = color;
    this.size = Math.abs(size / 2);
    this.ttl = 0;
    this.gravity = -0.2;
    this.vel = vel;
  }
  draw() {
    let { x, y } = this.pos;
    let hsl = this.color
      .split("")
      .filter((l) => l.match(/[^hsl()$% ]/g))
      .join("")
      .split(",")
      .map((n) => +n);
    let [r, g, b] = helpers.hsl2rgb(hsl[0], hsl[1] / 100, hsl[2] / 100);
    CTX.shadowColor = `rgb(${r},${g},${b},${1})`;
    CTX.shadowBlur = 0;
    CTX.globalCompositeOperation = "lighter";
    CTX.fillStyle = `rgb(${r},${g},${b},${1})`;
    CTX.fillRect(x, y, this.size, this.size);
    CTX.globalCompositeOperation = "source-over";
  }
  update() {
    this.draw();
    this.size -= 0.3;
    this.ttl += 1;
    this.pos.add(this.vel);
    this.vel.y -= this.gravity;
  }
}

function incrementScore() {
  score++;
  dom_score.innerText = score.toString().padStart(2, "0");
}

function particleSplash() {
  for (let i = 0; i < splashingParticleCount; i++) {
    let vel = new helpers.Vec(Math.random() * 6 - 3, Math.random() * 6 - 3);
    let position = new helpers.Vec(food.pos.x, food.pos.y);
    particles.push(new Particle(position, currentHue, food.size, vel));
  }
}

function clear() {
  CTX.clearRect(0, 0, W, H);
}

function initialize() {
  CTX.imageSmoothingEnabled = false;
  KEY.listen();
  cellsCount = cells * cells;
  cellSize = W / cells;
  snake = new Snake();
  food = new Food();
  dom_replay.addEventListener("click", reset, false);
  loop();
}

function loop() {
  clear();
  if (!isGameOver) {
    requestID = setTimeout(loop, 1000 / 60);
    helpers.drawGrid();
    snake.update();
    food.draw();
    for (let p of particles) {
      p.update();
    }
    helpers.garbageCollector();
  } else {
    clear();
    gameOver();
  }
}

function gameOver() {
  maxScore ? null : (maxScore = score);
  score > maxScore ? (maxScore = score) : null;
  window.localStorage.setItem("maxScore", maxScore);
  CTX.fillStyle = "#4cffd7";
  CTX.textAlign = "center";
  CTX.font = "bold 30px Poppins, sans-serif";
  CTX.fillText("GAME OVER", W / 2, H / 2);
  CTX.font = "15px Poppins, sans-serif";
  CTX.fillText(`SCORE   ${score}`, W / 2, H / 2 + 60);
  CTX.fillText(`MAXSCORE   ${maxScore}`, W / 2, H / 2 + 80);
}

function reset() {
  dom_score.innerText = "00";
  score = "00";
  snake = new Snake();
  food.spawn();
  KEY.resetState();
  isGameOver = false;
  clearTimeout(requestID);
  loop();
}

initialize();

    In conclusion, creating a Glowing Snake Game using HTML, CSS, and JavaScript has been an exciting and educational project. By combining HTML for structure, CSS for styling and glowing effects, and JavaScript for the game logic, we’ve crafted a modern and engaging version of the classic snake game.

    If your project has problems, don’t worry. Just click to download the source code and face your coding challenges with excitement. Have fun coding!

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