5/28/2014

Online students feedback management system (ASP .NET)

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5/19/2014

image puzzle game Using JavaScript, HTML & CSS

image puzzle game Using JavaScript, HTML & CSS
image puzzle game Using JavaScript, HTML & CSS

 

Step 1: HTML 

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Image Puzzle Game</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <h1>Image Puzzle Game</h1>
  <div id="puzzle-container"></div>
  <button id="shuffle-button">Shuffle</button>
  <p id="message"></p>

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

Step 2: CSS (style.css) 

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body {
  font-family: Arial, sans-serif;
  text-align: center;
  background-color: #f0f0f0;
}

#puzzle-container {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 2px;
  margin: 20px auto;
  width: 306px;
  border: 2px solid #444;
}

.tile {
  width: 100px;
  height: 100px;
  background-image: url('https://via.placeholder.com/300'); /* Change to any image URL */
  background-size: 300px 300px;
  cursor: pointer;
  border: 1px solid #ccc;
  box-sizing: border-box;
  transition: transform 0.2s;
}

.tile.correct {
  border-color: green;
}

#shuffle-button {
  padding: 10px 20px;
  font-size: 16px;
  margin-bottom: 10px;
}

#message {
  font-weight: bold;
  color: green;
}

Step 3: JavaScript (script.js) 

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const container = document.getElementById('puzzle-container');
const shuffleButton = document.getElementById('shuffle-button');
const message = document.getElementById('message');

const size = 3;
let tiles = [];

function createTiles() {
  tiles = [];

  for (let row = 0; row < size; row++) {
    for (let col = 0; col < size; col++) {
      const index = row * size + col;

      const tile = document.createElement('div');
      tile.classList.add('tile');
      tile.style.backgroundPosition = `-${col * 100}px -${row * 100}px`;
      tile.dataset.index = index;

      tile.addEventListener('click', () => selectTile(tile));
      container.appendChild(tile);
      tiles.push(tile);
    }
  }
}

let selectedTile = null;

function selectTile(tile) {
  if (!selectedTile) {
    selectedTile = tile;
    tile.style.transform = 'scale(1.1)';
  } else {
    swapTiles(selectedTile, tile);
    selectedTile.style.transform = 'scale(1)';
    selectedTile = null;
    checkWin();
  }
}

function swapTiles(tile1, tile2) {
  const temp = tile1.dataset.index;
  tile1.dataset.index = tile2.dataset.index;
  tile2.dataset.index = temp;

  updateTilePositions();
}

function updateTilePositions() {
  tiles.forEach(tile => {
    const index = tile.dataset.index;
    const row = Math.floor(index / size);
    const col = index % size;
    tile.style.backgroundPosition = `-${col * 100}px -${row * 100}px`;
  });
}

function shuffleTiles() {
  message.textContent = '';
  const indices = [...Array(tiles.length).keys()];
  indices.sort(() => Math.random() - 0.5);
  tiles.forEach((tile, i) => {
    tile.dataset.index = indices[i];
  });
  updateTilePositions();
}

function checkWin() {
  const isWin = tiles.every((tile, index) => Number(tile.dataset.index) === index);
  if (isWin) {
    message.textContent = '🎉 Puzzle Completed!';
    tiles.forEach(tile => tile.classList.add('correct'));
  } else {
    tiles.forEach(tile => tile.classList.remove('correct'));
  }
}

shuffleButton.addEventListener('click', shuffleTiles);

createTiles();
updateTilePositions();

You can change the image by replacing the URL in the CSS background-image property. To make it harder, increase the grid size (e.g., 4x4). Add a timer or move counter for more challenge.

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5/10/2014

Sliding Puzzle Game

 

Sliding Puzzle Game

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>Sliding Puzzle Game</title>
  <style>
    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: #222;
      color: white;
      display: flex;
      flex-direction: column;
      align-items: center;
      height: 100vh;
      margin: 0;
      justify-content: center;
    }

    h1 {
      margin-bottom: 20px;
    }

    #puzzle {
      display: grid;
      grid-template-columns: repeat(4, 80px);
      grid-template-rows: repeat(4, 80px);
      gap: 5px;
    }

    .tile {
      display: flex;
      justify-content: center;
      align-items: center;
      background: #61dafb;
      color: #222;
      font-weight: bold;
      font-size: 1.5rem;
      border-radius: 8px;
      cursor: pointer;
      user-select: none;
      transition: background 0.3s;
    }

    .tile.empty {
      background: transparent;
      cursor: default;
    }

    .tile:hover:not(.empty) {
      background: #21a1f1;
    }

    #message {
      margin-top: 20px;
      font-size: 1.2rem;
      min-height: 1.5em;
    }

    button {
      margin-top: 20px;
      padding: 10px 20px;
      font-size: 1rem;
      border: none;
      border-radius: 5px;
      background: #61dafb;
      color: #222;
      font-weight: bold;
      cursor: pointer;
      transition: background 0.3s;
    }
    button:hover {
      background: #21a1f1;
    }
  </style>
</head>
<body>
  <h1>Sliding Puzzle Game</h1>
  <div id="puzzle"></div>
  <div id="message"></div>
  <button id="shuffleBtn">Shuffle & Start</button>

  <script>
    const puzzle = document.getElementById('puzzle');
    const message = document.getElementById('message');
    const shuffleBtn = document.getElementById('shuffleBtn');

    let tiles = [];
    const size = 4; // 4x4 grid
    let emptyPos = size * size - 1; // start empty tile at last position
    let isPlaying = false;

    // Initialize tiles in order
    function init() {
      tiles = [];
      puzzle.innerHTML = '';
      for (let i = 0; i < size * size; i++) {
        tiles[i] = i;
        const tile = document.createElement('div');
        tile.classList.add('tile');
        if (i === emptyPos) {
          tile.classList.add('empty');
          tile.textContent = '';
        } else {
          tile.textContent = i + 1;
        }
        tile.setAttribute('data-index', i);
        tile.addEventListener('click', () => {
          if (!isPlaying) return;
          moveTile(i);
        });
        puzzle.appendChild(tile);
      }
      message.textContent = "Click 'Shuffle & Start' to play!";
    }

    // Swap two tiles in the array and update the DOM
    function swapTiles(i, j) {
      [tiles[i], tiles[j]] = [tiles[j], tiles[i]];
      updateTiles();
    }

    // Update tile DOM to reflect current tiles array
    function updateTiles() {
      tiles.forEach((value, i) => {
        const tile = puzzle.children[i];
        if (value === emptyPos) {
          tile.classList.add('empty');
          tile.textContent = '';
          tile.style.cursor = 'default';
        } else {
          tile.classList.remove('empty');
          tile.textContent = value + 1;
          tile.style.cursor = 'pointer';
        }
      });
    }

    // Check if tile at index can move (if adjacent to empty)
    function canMove(index) {
      const row = Math.floor(index / size);
      const col = index % size;
      const emptyRow = Math.floor(tiles.indexOf(emptyPos) / size);
      const emptyCol = tiles.indexOf(emptyPos) % size;

      // Check if tile is next to empty tile (up/down/left/right)
      return (
        (row === emptyRow && Math.abs(col - emptyCol) === 1) ||
        (col === emptyCol && Math.abs(row - emptyRow) === 1)
      );
    }

    // Move tile if possible
    function moveTile(index) {
      if (canMove(index)) {
        const emptyIndex = tiles.indexOf(emptyPos);
        swapTiles(index, emptyIndex);
        if (checkWin()) {
          message.textContent = "🎉 Congratulations! You solved the puzzle!";
          isPlaying = false;
        }
      }
    }

    // Shuffle tiles randomly using Fisher-Yates shuffle and check solvability
    function shuffle() {
      do {
        for (let i = tiles.length - 2; i > 0; i--) {
          const j = Math.floor(Math.random() * (i + 1));
          [tiles[i], tiles[j]] = [tiles[j], tiles[i]];
        }
      } while (!isSolvable(tiles));
      updateTiles();
      message.textContent = "Game started! Arrange the tiles.";
      isPlaying = true;
    }

    // Check if puzzle is solved
    function checkWin() {
      for (let i = 0; i < tiles.length - 1; i++) {
        if (tiles[i] !== i) return false;
      }
      return true;
    }

    // Count inversions for solvability check
    function countInversions(arr) {
      let inversions = 0;
      for (let i = 0; i < arr.length - 1; i++) {
        for (let j = i + 1; j < arr.length; j++) {
          if (arr[i] !== emptyPos && arr[j] !== emptyPos && arr[i] > arr[j]) {
            inversions++;
          }
        }
      }
      return inversions;
    }

    // Check if current puzzle configuration is solvable
    function isSolvable(arr) {
      const inversions = countInversions(arr);
      const emptyRow = Math.floor(arr.indexOf(emptyPos) / size);

      // For even grid width (4), puzzle is solvable if:
      // - empty on even row from bottom and inversions odd
      // - empty on odd row from bottom and inversions even
      if (size % 2 === 0) {
        const emptyRowFromBottom = size - emptyRow;
        if ((emptyRowFromBottom % 2 === 0) === (inversions % 2 === 1)) {
          return true;
        } else {
          return false;
        }
      } else {
        // Odd grid width: inversions must be even
        return inversions % 2 === 0;
      }
    }

    shuffleBtn.addEventListener('click', () => {
      shuffle();
    });

    init();
  </script>
</body>
</html>

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