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HTML

              
                <main class="main">
  <ul class="main_list">
    <li class="main_list_item main_list_item-01">
      <img class="begumaru" width="340" src="https://bagelee.s3-ap-northeast-1.amazonaws.com/uploads/production/attachments/5668/2019/11/12/63144/1c187813-c5ba-424d-aff3-dda44f09ea77.png">
    </li>
    <li class="main_list_item main_list_item-02">
      <img class="begumaru" width="300" src="https://bagelee.s3-ap-northeast-1.amazonaws.com/uploads/production/attachments/5668/2019/11/12/63144/604a0485-4c92-4596-bd48-d0c25cf0954b.png">
    </li>
    <li class="main_list_item main_list_item-03">
      <img class="begumaru" width="300" src="https://bagelee.s3-ap-northeast-1.amazonaws.com/uploads/production/attachments/5668/2019/11/12/63144/445d8439-f48e-4278-a167-c67d6e6df695.png">
    </li>
    <li class="main_list_item main_list_item-04">
      <img class="begumaru" width="260" src="https://bagelee.s3-ap-northeast-1.amazonaws.com/uploads/production/attachments/5668/2019/11/12/63144/56ea4be0-8c1e-4801-8560-44548561ae48.png">
    </li>
    <li class="main_list_item main_list_item-05">
      <img class="begumaru" width="260" src="https://bagelee.s3-ap-northeast-1.amazonaws.com/uploads/production/attachments/5668/2019/11/12/63144/a6c30a09-e532-4ca0-9abf-b0d6424c71ce.png">
    </li>
  </ul>
</main>
              
            
!

CSS

              
                html {
  width: 100%;
  height: 100%;
}

body {
  width: 100%;
  height: 100%;
}

.main {
  display: block;
  width: 100%;
  height: 100%;
  position: relative;
  &_list {
    width: 1600px;
    height: 100%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    &_item {
      position: absolute;
      transform: translate(-50%, -50%);
      .begumaru {
        transition: .15s;
      }
      &-01 {
        top: 50%;
        left: 50%;
        z-index: 5;
      }
      &-02 {
        top: 50%;
        left: 37.5%;
        z-index: 4;
      }
      &-03 {
        top: 50%;
        left: 62.5%;
        z-index: 3;
      }
      &-04 {
        top: 50%;
        left: 25%;
        z-index: 2;
      }
      &-05 {
        top: 50%;
        left: 75%;
        z-index: 1;
      }
    }
  }
}
              
            
!

JS

              
                /**
* 小数点の桁数をを指定し、四捨五入して返す
* @param {number} number - 対象となる数値 
* @param {number} digit - 小数点の桁数
* @return {number} xxx.xx
* @note Math.pow() は累乗を算出する関数で、 Math(x, y) はxのy乗を表す
*/
const toDecimal = (number, digit) => {
  return Math.round(number * Math.pow(10, digit)) / Math.pow(10, digit);
};



/**
* 初期値
*/
const windowWidth = window.innerWidth;                              // ウィンドウの幅
const windowHeight = window.innerHeight;                            // ウィンドウの高さ
const begumaruNode = document.querySelectorAll('.begumaru');        // 対象となる要素の配列
const begumaruArray = Array.prototype.slice.call(begumaruNode, 0);  // 対象となる要素の配列 (IE対策)
const begumaruPosition = begumaruArray.map((item, index) => {       // 対象となる要素の位置座標の配列
  const itemWidth = item.clientWidth;                               // 要素の横幅
  const itemHeight = item.clientHeight;                             // 要素の横幅
  const itemRect = item.getBoundingClientRect();                    // 要素の初期位置情報
  const itemLeft = itemRect.left + itemWidth / 2;                   // 調整前の位置座標X
  const itemTop = itemRect.top + itemHeight / 2;                    // 調整前の位置座標Y
  let itemX = (itemLeft * 2 - windowWidth) / windowWidth;           // 調整後の位置座標X
  let itemY = (itemTop * 2 - windowHeight) / windowHeight;          // 調整後の位置座標Y
  let itemZ = (begumaruArray.length - index) / 5;                   // 配列に入っている数 - 配列のインデックス
                                                                    // = 配列の最初ほど大きく配列の最後ほど小さい値
                                                                    // = どのくらい要素を動かすか決める係数
  itemX = toDecimal(itemX, 2);                                      // 小数点の桁数が多いので第二位までに
  itemY = toDecimal(itemY, 2);                                      // 小数点の桁数が多いので第二位までに
  return { itemX, itemY, itemZ };                                   // 位置座標 と どのくらい動かすか決める係数 を格納
});




/**
* マウスが動いたら処理を開始
*/
window.addEventListener('mousemove', (eve) => {                     // eve.clientX と eve.clientY で調整前のマウスの位置座標が取得できる
  let eveX = (eve.clientX * 2 - windowWidth) / windowWidth;         // 調整後のマウスの位置座標X
  let eveY = (eve.clientY * 2 - windowHeight) / windowHeight;       // 調整後のマウスの位置座標Y
  eveX = toDecimal(eveX, 2);                                        // 小数点の桁数が多いので第二位までに
  eveY = toDecimal(eveY, 2);                                        // 小数点の桁数が多いので第二位までに
});
              
            
!
999px

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