javascript-mini-game/2048.html at main · youngsikkk/javascript-mini-game · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>2048</title>
  <style>
    #table { border-collapse: collapse; user-select: none; }
    #table td {
      border: 10px solid #bbada0; width: 116px; height: 128px;
      font-size: 50px; font-weight: bold; text-align: center;
    }
    #score { user-select: none; }
    .color-2 { background-color: #eee4da; color: #776e65;}
    .color-4 { background-color: #eee1c9; color: #776e65;}
    .color-8 { background-color: #f3b27a; color: 'white';}
    .color-16 { background-color: #f69664; color: 'white';}
    .color-32 { background-color: #f77c5f; color: 'white';}
    .color-64 { background-color: #f75f3b; color: 'white';}
    .color-128 { background-color: #edd073; color: #776e65;}
    .color-256 { background-color: #edcc62; color: #776e65;}
    .color-512 { background-color: #edc950; color: #776e65;}
    .color-1024 { background-color: #edc53f; color: #776e65;}
    .color-2048 { background-color: #edc22e; color: #776e65;}
  </style>
</head>
<body>
  <table id="table"></table>
  <div id="score">0</div>
  <script>
    const $table = document.querySelector('#table');
    const $score = document.querySelector('#score');
    let data = [];
    // fragment는 직접 그려지는 것이 아니라, 메모리에만 저장됨
    // 결과적으로 딱 1번만 그려서 성능 향상
    function startGame() {
      const $fragment = document.createDocumentFragment();
      [1,2,3,4].forEach(function () {
        const rowData = [];
        data.push(rowData);
        const $tr = document.createElement('tr');
        [1,2,3,4].forEach(() => {
          rowData.push(0);
          const $td = document.createElement('td');
          $tr.appendChild($td);
        });
        $fragment.appendChild($tr);
      });
      $table.appendChild($fragment);
      put2ToRandomCell();
      draw();
    }
    function put2ToRandomCell() {
      const emptyCells = [];
      data.forEach(function (rowData, i) {
        rowData.forEach(function (cellData,j) {
          if (!cellData) {
            emptyCells.push([i,j]);
          }
        });
      });
      const randomCell = emptyCells[Math.floor(Math.random()*emptyCells.length)];
      data[randomCell[0]][randomCell[1]] = 2;
    }

    function draw() {
      data.forEach(function (rowData, i) {
        rowData.forEach(function (cellData, j) {
          const $target = $table.children[i].children[j];
          if (cellData > 0) {
            $target.textContent = cellData;
            $target.className = 'color-'+cellData;
          } else {
            $target.textContent = '';
            $target.className = '';
          }
        });
      });
    }

    function moveCells(direction) {
      switch (direction) {
        case 'left': {
          const newData = [[], [], [], []];
          data.forEach((rowData, i) => {
            rowData.forEach((cellData, j) => {
              if (cellData) {
                const currentRow = newData[i];
                const prevData = currentRow.at(-1);
                console.log(prevData, cellData);
                if (prevData === cellData) { // 이전 값과 지금 값이 같으면
                  const score = parseInt($score.textContent);
                  $score.textContent = score + currentRow.at(-1) * 2;
                  currentRow[currentRow.length - 1] *= 2;
                } else {
                  newData[i].push(cellData);
                }
              }
            });
          });
          console.log(newData);
          [1, 2, 3, 4].forEach((rowData, i) => {
            [1, 2, 3, 4].forEach((cellData, j) => {
              data[i][j] = Math.abs(newData[i][j]) || 0;
            });
          });
          break;
        }
        case 'right': {
          const newData = [[], [], [], []];
          data.forEach((rowData, i) => {
            rowData.forEach((cellData, j) => {
              if (rowData[3 - j]) {
                const currentRow = newData[i];
                const prevData = currentRow.at(-1);
                if (prevData === rowData[3 - j]) {
                  const score = parseInt($score.textContent);
                  $score.textContent = score + currentRow.at(-1) * 2;
                  currentRow[currentRow.length - 1] *= -2;
                } else {
                  newData[i].push(rowData[3 - j]);
                }
              }
            });
          });
          console.log(newData);
          [1, 2, 3, 4].forEach((rowData, i) => {
            [1, 2, 3, 4].forEach((cellData, j) => {
              data[i][3 - j] = Math.abs(newData[i][j]) || 0;
            });
          });
          break;
        }
        case 'up': {
          const newData = [[], [], [], []];
          data.forEach((rowData, i) => {
            rowData.forEach((cellData, j) => {
              if (cellData) {
                const currentRow = newData[j];
                const prevData = currentRow.at(-1);
                if (prevData === cellData) {
                  const score = parseInt($score.textContent);
                  $score.textContent = score + currentRow.at(-1) * 2;
                  currentRow[currentRow.length - 1] *= -2;
                } else {
                  newData[j].push(cellData);
                }
              }
            });
          });
          console.log(newData);
          [1, 2, 3, 4].forEach((cellData, i) => {
            [1, 2, 3, 4].forEach((rowData, j) => {
              data[j][i] = Math.abs(newData[i][j]) || 0;
            });
          });
          break;
        }
        case 'down': {
          const newData = [[], [], [], []];
          data.forEach((rowData, i) => {
            rowData.forEach((cellData, j) => {
              if (data[3 - i][j]) {
                const currentRow = newData[j];
                const prevData = currentRow.at(-1);
                if (prevData === data[3 - i][j]) {
                  const score = parseInt($score.textContent);
                  $score.textContent = score + currentRow.at(-1) * 2;
                  currentRow[currentRow.length - 1] *= -2;
                } else {
                  newData[j].push(data[3 - i][j]);
                }
              }
            });
          });
          console.log(newData);
          [1, 2, 3, 4].forEach((cellData, i) => {
            [1, 2, 3, 4].forEach((rowData, j) => {
              data[3 - j][i] = Math.abs(newData[i][j]) || 0;
            });
          });
          break;
        }
      }
      if (data.flat().includes(2048)) { // 승리
        draw();
        setTimeout(() => {
          alert('축하합니다. 2048을 만들었습니다!');
        }, 0);
      } else if (!data.flat().includes(0)) { // 빈칸이 없으면 패배
          alert(`패배했습니다... ${$score.textContent}점`);
      } else {
        put2ToRandomCell();
        draw();
      }
    }

    window.addEventListener('keyup', (event) => {
      if (event.key === 'ArrowUp') {
        moveCells('up');
      } else if (event.key === 'ArrowDown') {
        moveCells('down');
      } else if (event.key === 'ArrowLeft') {
        moveCells('left');
      } else if (event.key === 'ArrowRight') {
        moveCells('right');
      }
    });
    let startCoord;
    window.addEventListener('mousedown', (event) => {
      startCoord = [event.clientX, event.clientY];
    });
    window.addEventListener('mouseup', (event) => {
      const endCoord = [event.clientX, event.clientY];
      const diffX = endCoord[0] - startCoord[0];
      const diffY = endCoord[1] - startCoord[1];
      if (diffX < 0 && Math.abs(diffX) > Math.abs(diffY)) {
        moveCells('left');
      } else if (diffX > 0 && Math.abs(diffX) > Math.abs(diffY)) {
        moveCells('right');
      } else if (diffY > 0 && Math.abs(diffX) <= Math.abs(diffY)) {
        moveCells('down');
      } else if (diffY < 0 && Math.abs(diffX) <= Math.abs(diffY)) {
        moveCells('up');
      }
    });

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