Tetris

index.pug

div(id='outer-board')
  div(id='board') 
    div(id='banner')
      div 
        div(id='message')
        div(id='new-game') Tap here to start!
    - var n=0;
    while n < 160
      div(class="empty")
        div(class="inner-tile")
          div(class="inner-inner-tile")
      - n++;
  div(id='stats')
    div(class='labels') Scores
      div(id='score' class='frame') 0        
    button(class='btn btn-rounded' id="left") 
      i(class="fa fas fa-arrow-left")
    button(class='btn btn-rounded' id="right")
      i(class="fa fas fa-arrow-right")
    button(class='btn btn-rounded' id="rotate") 
      i(class="fa fas fa-undo flipx")
    button(class='btn btn-rounded' id="down") 
      i(class="fa fas fa-arrow-down")

script.js

class Position {
  constructor(x, y) {
    this.x = x;
    this.y = y;
  }
}

class Block {
  constructor(x, y) {
    this.x = x;
    this.y = y;

    let block = document.createElement("div");
    block.setAttribute("class", "block");
    $(block).append(
      "<div class='inner-tile'><div class='inner-inner-tile'></div></div>"
    );
    this.element = block;
  }

  init() {
    $("#board").append(this.element);
  }

  render() {
    $(this.element).css({
      left: this.y * $(this.element).innerWidth() + "px",
      top: this.x * $(this.element).innerHeight() + "px"
    });
  }

  fall() {
    this.x += 1;
  }

  moveRight() {
    this.y += 1;
  }

  moveLeft() {
    this.y -= 1;
  }

  rightPosition() {
    return new Position(this.x, this.y + 1);
  }

  leftPosition() {
    return new Position(this.x, this.y - 1);
  }

  getPosition() {
    return new Position(this.x, this.y);
  }

  flash() {
    return window.animatelo.flash(this.element, {
      duration: 500
    });
  }

  destroy() {
    $(this.element).remove();
  }
}

class Shape {
  constructor(blocks) {
    this.blocks = blocks;
  }

  getBlocks() {
    return Array.from(this.blocks);
  }

  init() {
    for (let block of this.blocks) {
      block.init();
    }
  }

  render() {
    for (let block of this.blocks) {
      block.render();
    }
  }

  fallingPositions() {
    return this.blocks
      .map(b => b.getPosition())
      .map(p => new Position(p.x + 1, p.y));
  }

  fall() {
    for (let block of this.blocks) {
      block.fall();
    }
  }

  rightPositions() {
    return this.blocks.map(b => b.rightPosition());
  }

  leftPositions() {
    return this.blocks.map(b => b.leftPosition());
  }

  moveRight() {
    for (let block of this.blocks) {
      block.moveRight();
    }
  }

  moveLeft() {
    for (let block of this.blocks) {
      block.moveLeft();
    }
  }

  clear() {
    for (let block of this.blocks) {
      block.destroy();
    }
    this.blocks = [];
  }

  addBlocks(blocks) {
    for (let block of blocks) {
      this.blocks.push(block);
    }
  }

  rotate() {
    //do nothing
  }

  rotatePositions() {
    //do nothing
  }
}

class Square extends Shape {
  constructor(x, y) {
    let blocks = [];
    blocks.push(new Block(x, y));
    blocks.push(new Block(x, y + 1));
    blocks.push(new Block(x + 1, y));
    blocks.push(new Block(x + 1, y + 1));
    super(blocks);
  }
}

class LShape extends Shape {
  constructor(x, y) {
    let blocks = [];
    blocks.push(new Block(x, y));
    blocks.push(new Block(x - 1, y));
    blocks.push(new Block(x + 1, y));
    blocks.push(new Block(x + 1, y + 1));
    super(blocks);
    this.position = 0;
  }

  rotate() {
    let blocks = this.rotatePositions().map(p => new Block(p.x, p.y));
    this.clear();
    this.addBlocks(blocks);
    this.position = this.getNextPosition();
  }

  rotatePositions() {
    let pos = this.getBlocks()
      .shift()
      .getPosition();
    let x = pos.x;
    let y = pos.y;
    let positions = [];
    switch (this.getNextPosition()) {
      case 0:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x - 1, y));
          positions.push(new Position(x + 1, y));
          positions.push(new Position(x + 1, y + 1));
        }
        break;
      case 1:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x, y - 1));
          positions.push(new Position(x, y + 1));
          positions.push(new Position(x + 1, y - 1));
        }
        break;
      case 2:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x - 1, y - 1));
          positions.push(new Position(x - 1, y));
          positions.push(new Position(x + 1, y));
        }
        break;
      case 3:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x, y - 1));
          positions.push(new Position(x, y + 1));
          positions.push(new Position(x - 1, y + 1));
        }
        break;
    }
    return positions;
  }

  getNextPosition() {
    return (this.position + 1) % 4;
  }
}

class TShape extends Shape {
  constructor(x, y) {
    let blocks = [];
    blocks.push(new Block(x, y));
    blocks.push(new Block(x, y - 1));
    blocks.push(new Block(x + 1, y));
    blocks.push(new Block(x, y + 1));
    super(blocks);
    this.position = 0;
  }

  rotate() {
    let blocks = this.rotatePositions().map(p => new Block(p.x, p.y));
    this.clear();
    this.addBlocks(blocks);
    this.position = this.getNextPosition();
  }

  rotatePositions() {
    let pos = this.getBlocks()
      .shift()
      .getPosition();
    let x = pos.x;
    let y = pos.y;
    let positions = [];
    switch (this.getNextPosition()) {
      case 0:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x, y - 1));
          positions.push(new Position(x + 1, y));
          positions.push(new Position(x, y + 1));
        }
        break;
      case 1:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x - 1, y));
          positions.push(new Position(x, y - 1));
          positions.push(new Position(x + 1, y));
        }
        break;
      case 2:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x, y - 1));
          positions.push(new Position(x - 1, y));
          positions.push(new Position(x, y + 1));
        }
        break;
      case 3:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x - 1, y));
          positions.push(new Position(x, y + 1));
          positions.push(new Position(x + 1, y));
        }
        break;
    }
    return positions;
  }

  getNextPosition() {
    return (this.position + 1) % 4;
  }
}

class ZShape extends Shape {
  constructor(x, y) {
    let blocks = [];
    blocks.push(new Block(x, y));
    blocks.push(new Block(x, y - 1));
    blocks.push(new Block(x + 1, y));
    blocks.push(new Block(x + 1, y + 1));
    super(blocks);
    this.position = 0;
  }

  rotate() {
    let blocks = this.rotatePositions().map(p => new Block(p.x, p.y));
    this.clear();
    this.addBlocks(blocks);
    this.position = this.getNextPosition();
  }

  rotatePositions() {
    let pos = this.getBlocks()
      .shift()
      .getPosition();
    let x = pos.x;
    let y = pos.y;
    let positions = [];
    switch (this.getNextPosition()) {
      case 0:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x, y - 1));
          positions.push(new Position(x + 1, y));
          positions.push(new Position(x + 1, y + 1));
        }
        break;
      case 1:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x - 1, y));
          positions.push(new Position(x, y - 1));
          positions.push(new Position(x + 1, y - 1));
        }
        break;
    }
    return positions;
  }

  getNextPosition() {
    return (this.position + 1) % 2;
  }
}

class Line extends Shape {
  constructor(x, y) {
    let blocks = [];
    blocks.push(new Block(x, y));
    blocks.push(new Block(x - 1, y));
    blocks.push(new Block(x + 1, y));
    blocks.push(new Block(x + 2, y));
    super(blocks);
    this.position = 0;
  }

  rotate() {
    let blocks = this.rotatePositions().map(p => new Block(p.x, p.y));
    this.clear();
    this.addBlocks(blocks);
    this.position = this.getNextPosition();
  }

  rotatePositions() {
    let pos = this.getBlocks()
      .shift()
      .getPosition();
    let x = pos.x;
    let y = pos.y;
    let positions = [];
    switch (this.getNextPosition()) {
      case 0:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x - 1, y));
          positions.push(new Position(x + 1, y));
          positions.push(new Position(x + 2, y));
        }
        break;
      case 1:
        {
          positions.push(new Position(x, y));
          positions.push(new Position(x, y - 1));
          positions.push(new Position(x, y + 1));
          positions.push(new Position(x, y + 2));
        }
        break;
    }
    return positions;
  }

  getNextPosition() {
    return (this.position + 1) % 2;
  }
}

class Board {
  constructor() {
    this.blocks = [];
    this.shapes = [];
    this.interval = undefined;
    this.loopInterval = 1000;
    this.gameOver = true;
    this.loopIntervalFast = parseInt(1000 / 27);
    this.init();
    this.score = 0;
  }

  setScore(value) {
    this.score = value;
    $("#score").text(this.score);
  }

  getScore() {
    return this.score;
  }

  init() {
    $(".empty").each(function(index, ele) {
      let x = parseInt(index / 10);
      let y = index % 10;
      $(ele).css({
        left: y * $(ele).innerWidth() + "px",
        top: x * $(ele).innerHeight() + "px"
      });
    });
    $("#message").text("Tetris");
    window.animatelo.flash("#new-game", {
      duration: 2500,
      iterations: Infinity
    });
  }

  newGame() {
    for (let shape of this.shapes) {
      this.removeShape(shape);
      this.addBlocks(shape.getBlocks());
    }
    for (let block of this.blocks) {
      block.destroy();
    }
    this.blocks = [];
    this.gameOver = false;
    this.initGameLoop(this.loopInterval);
    this.setScore(0);
    $("#banner").hide();
  }

  initGameLoop(value) {
    if (this.interval) {
      clearInterval(this.interval);
    }
    let ref = this;
    this.interval = setInterval(function() {
      ref.gameLoop();
    }, value);
  }

  gameLoop() {
    this.renderShapes();
    this.renderBlocks();
    this.spawnShapes();
    this.gameUpdate();
    console.log("Shapes Length:" + this.shapes.length);
    console.log("Blocks Length:" + this.blocks.length);
  }

  gameUpdate() {
    if (this.isGameOver()) {
      this.gameOver = true;
      if (this.interval) {
        clearInterval(this.interval);
        this.interval = undefined;
      }
      $("#banner").show();
      $("#message").text("Game Over!");
      $("#new-game").text("Tap here to start again!");
    }
  }

  isGameOver() {
    for (let block of this.blocks) {
      let pos = block.getPosition();
      if (pos.x === 0 && pos.y === 4) {
        return true;
      }
    }
    return false;
  }

  renderShapes() {
    for (let shape of this.getShapes()) {
      if (
        this.arePositonsWithinBoard(shape.fallingPositions()) &&
        this.areBlocksEmpty(shape.fallingPositions())
      ) {
        shape.fall();
        shape.render();
      } else {
        this.removeShape(shape);
        this.addBlocks(shape.getBlocks());
        if (this.moveFast) {
          this.initGameLoop(this.loopInterval);
          this.moveFast = false;
        }
      }
    }
  }

  dropShape() {
    if (!this.gameOver) {
      this.initGameLoop(this.loopIntervalFast);
      this.moveFast = true;
    }
  }

  renderBlocks() {
    for (let x = 0; x < 16; x++) {
      let blocks = [];
      for (let y = 0; y < 10; y++) {
        let block = this.getBlock(x, y);
        if (!block) {
          break;
        }
        blocks.push(block);
      }
      if (blocks.length == 10) {
        let ref = this;
        this.removeBlocks(blocks);
        this.flashBlocks(blocks, function() {
          ref.destroyBlocks(blocks);
          ref.fallBlocks(x);
          ref.setScore(ref.getScore() + 10);
        });
      }
    }
  }

  flashBlocks(blocks, callback) {
    let anim = null;
    for (let block of blocks) {
      anim = block.flash();
    }
    anim[0].onfinish = callback;
  }

  fallBlocks(i) {
    for (let x = 0; x < i; x++) {
      for (let y = 0; y < 10; y++) {
        let block = this.getBlock(x, y);
        if (block) {
          block.fall();
          block.render();
        }
      }
    }
  }

  removeBlocks(blocks) {
    for (let block of blocks) {
      this.blocks.splice(this.blocks.indexOf(block), 1);
    }
  }

  destroyBlocks(blocks) {
    for (let block of blocks) {
      block.destroy();
    }
  }

  getBlock(x, y) {
    for (let block of this.blocks) {
      if (block.x == x && block.y == y) {
        return block;
      }
    }
    return undefined;
  }

  spawnShapes() {
    if (this.shapes.length == 0) {
      let shape = null;

      switch (this.getRandomRange(0, 4)) {
        case 0:
          {
            shape = new Line(0, 4);
          }
          break;
        case 1:
          {
            shape = new Square(0, 4);
          }
          break;
        case 2:
          {
            shape = new LShape(0, 4);
          }
          break;
        case 3:
          {
            shape = new ZShape(0, 4);
          }
          break;
        case 4:
          {
            shape = new TShape(0, 4);
          }
          break;
      }

      shape.init();
      shape.render();
      this.shapes.push(shape);
    }
  }

  getShapes() {
    return Array.from(this.shapes);
  }

  removeShape(shape) {
    this.shapes.splice(this.shapes.indexOf(shape), 1);
  }

  addBlocks(blocks) {
    for (let block of blocks) {
      this.blocks.push(block);
    }
  }

  arePositonsWithinBoard(positions) {
    for (let position of positions) {
      if (position.x >= 16 || position.y < 0 || position.y >= 10) {
        return false;
      }
    }
    return true;
  }

  areBlocksEmpty(positions) {
    for (let position of positions) {
      for (let block of this.blocks) {
        let pos = block.getPosition();
        if (pos.x == position.x && pos.y == position.y) {
          return false;
        }
      }
    }
    return true;
  }

  leftKeyPress() {
    for (let shape of this.shapes) {
      if (
        this.arePositonsWithinBoard(shape.leftPositions()) &&
        this.areBlocksEmpty(shape.leftPositions())
      ) {
        shape.moveLeft();
        shape.render();
      }
    }
  }

  rotate() {
    for (let shape of this.shapes) {
      if (
        this.arePositonsWithinBoard(shape.rotatePositions()) &&
        this.areBlocksEmpty(shape.rotatePositions())
      )
        shape.rotate();
      shape.init();
      shape.render();
    }
  }

  rightKeyPress() {
    for (let shape of this.shapes) {
      if (
        this.arePositonsWithinBoard(shape.rightPositions()) &&
        this.areBlocksEmpty(shape.rightPositions())
      ) {
        shape.moveRight();
        shape.render();
      }
    }
  }

  upKeyPress() {
    this.rotate();
  }

  downKeyPress() {
    this.dropShape();
  }

  getRandomRange(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
  }
}

let board = new Board();

$(document).keydown(function(e) {
  switch (e.which) {
    case 37: // left
      board.leftKeyPress();
      break;

    case 38: // up
      board.upKeyPress();
      break;

    case 39: // right
      board.rightKeyPress();
      break;

    case 40: // down
      board.downKeyPress();
      break;

    case 78: // n
      board.newGame();
      break;

    default:
      console.log(e.which);
      break; // exit this handler for other keys
  }
  e.preventDefault(); // prevent the default action (scroll / move caret)
});

$("#new-game").click(function() {
  board.newGame();
});

$("#down").click(function() {
  board.downKeyPress();
});

$("#rotate").click(function() {
  board.upKeyPress();
});

$("#left").click(function() {
  board.leftKeyPress();
});

$("#right").click(function() {
  board.rightKeyPress();
});

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/animatelo/1.0.3/animatelo.min.js"></script>

style.css

body {
  background-color: #c4d6a7;
  font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif;
}

.labels {
  margin: auto;
  margin-top: 10px;
  text-align: center;
  text-transform: uppercase;
  font-size: 14px;
  font-weight: bold;
  color: #303a21;
  word-wrap: break-word;
  margin-bottom: 50px;
}

.frame {
  margin: auto;
  padding: 5px 0px;
  width: 56px;
  border: 2px solid #303a21;
}

.btn {
  display: block;
  margin: auto;
  margin-top: 10px;
  background-color: #303a21;
  color: #c4d6a7;
  padding: 10px 5px;
  text-transform: uppercase;
  font-size: 10px;
  border: 0px;
  cursor: pointer;
  border: 0px;
}

.btn-rounded {
  width: 50px;
  height: 50px;
  border-radius: 50%;
}

.fa {
  font-size: 14px;
}

.flipx {
  transform: scaleX(-1);
}

#score {
  margin-top: 5px;
}

#outer-board {
  width: 365px;
  margin: auto;
}

#board {
  float: left;
  position: relative;
  background-color: #c4d6a7;
  width: 280px;
  height: 448px;
  margin: 10px auto;
  border: 2px solid #303a21;
}

#stats {
  float: right;
  position: relative;
  background-color: #c4d6a7;
  width: 70px;
  height: 448px;
  margin: 10px auto;
  border: 2px solid #303a21;
}

#banner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 200px;
  height: 100px;
  background-color: #303a21;
  color: #c4d6a7;
  z-index: 2;
  text-align: center;
}

#message {
  font-weight: bold;
  text-transform: uppercase;
  font-size: 23px;
  margin: 10px;
  margin-top: 20px;
}

#new-game {
  font-weight: 100;
  cursor: pointer;
}

.block,
.empty {
  position: absolute;
  background-color: #c4d6a7;
  width: 28px;
  height: 28px;
}

.empty {
  opacity: 0.2;
}

.inner-tile {
  position: absolute;
  background-color: #c4d6a7;
  border: 4px solid #303a21;
  width: 14px;
  height: 14px;
  margin: 3px;
}

.inner-inner-tile {
  position: absolute;
  background-color: #303a21;
  width: 8px;
  height: 8px;
  margin: 3px;
}

styles

<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />

tetris.markdown

Tetris

Tetris is one of the best games from the most popular console of the 1990s. Do you feel tired of with complicated and difficult games? Did you miss the favorite classic games? Let's play this game to feel nostalgic! How to play: Move and rotate the falling blocks. Lines are cleared when they are filled with blocks and have no empty spaces

A Pen by kien on CodePen.

License.