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HTML

              
                <head>
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <!--==============レイアウトを制御する独自のCSSを読み込み===============-->
  <link rel="stylesheet" type="text/css" href="https://assets.codepen.io/6329135/reset.css">
</head>

<body>
  <p class="lead">使用したライブラリ:<a href="https://www.chartjs.org/" target="_blank">https://www.chartjs.org/</a></p>

  <div class="box">
    <h2>2021年CMS使用統計</h2>
    <div class="chart-area">
      <canvas id="chart"></canvas>
    </div>
    <!--/box-->
  </div>

  <script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/protonet-jquery.inview/1.1.2/jquery.inview.min.js"></script>
</body>
              
            
!

CSS

              
                @charset "utf-8";

/*=========グラフ表示のためのCSS ===============*/

.chart-area {
  /*円グラフがスマホでつぶれないようにする*/
  position: relative;
  width: 100%;
  height: 50vh;
}

/*========= レイアウトのためのCSS ===============*/

body {
  vertical-align: middle;
  text-align: center;
  width: 100%;
  height: 100vh;
  background-image: linear-gradient(
    76.5deg,
    rgba(129, 252, 255, 1) 0.4%,
    rgba(255, 175, 207, 1) 49.8%,
    rgba(255, 208, 153, 1) 98.6%
  );
}

h1 {
  text-align: center;
  text-transform: uppercase;
  font-size: 2rem;
  padding-top: 30px 0;
  color: #666;
}

.lead {
  padding: 20px;
  text-align: center;
}

a {
  color: #666;
  font-weight: bold;
}

.box {
  width: 80vw;
  margin: 50px auto;
  padding: 20px;
  text-align: center;
  background: rgba(255, 255, 255, 0.4);
  box-shadow: 10px 10px 5px -2px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border-radius: 10px;
}

h2,
p {
  color: #666;
}

              
            
!

JS

              
                //値をグラフに表示させる
Chart.plugins.register({
  afterDatasetsDraw: function (chart, easing) {
    var ctx = chart.ctx;
    chart.data.datasets.forEach(function (dataset, i) {
      var meta = chart.getDatasetMeta(i);
      if (!meta.hidden) {
        meta.data.forEach(function (element, index) {
          // 値の表示
          ctx.fillStyle = "rgb(0, 0, 0,0.8)"; //文字の色
          var fontSize = 15; //フォントサイズ
          var fontStyle = "normal"; //フォントスタイル
          var fontFamily = "Arial"; //フォントファミリー
          ctx.font = Chart.helpers.fontString(fontSize, fontStyle, fontFamily);

          var dataString = dataset.data[index].toString();

          // 値の位置
          ctx.textAlign = "center"; //テキストを中央寄せ
          ctx.textBaseline = "middle"; //テキストベースラインの位置を中央揃え

          var padding = 5; //余白
          var position = element.tooltipPosition();
          ctx.fillText(
            dataString,
            position.x,
            position.y - fontSize / 2 - padding
          );
        });
      }
    });
  }
});

//=========== 円グラフ ============//
$("#chart").on("inview", function (event, isInView) {
  //画面上に入ったらグラフを描画
  if (isInView) {
    var ctx = document.getElementById("chart"); //グラフを描画したい場所のid
    var chart = new Chart(ctx, {
      type: "pie", //グラフのタイプ
      data: {
        labels: ["WordPress", "Shopify", "Joomla", "Wix", "None"], //データの名前
        datasets: [
          {
            label: "2021年CMS使用統計", //グラフのタイトル
            backgroundColor: [
              "rgba(255, 0, 0, 0.7)",
              "rgba(30, 30, 30, 0.8)",
              "rgba(50, 50, 50, 0.6)",
              "rgba(70, 70, 70, 0.3)",
              "rgba(238, 238, 238, 0.6)"
            ], //グラフの背景色
            data: ["42.6", "4.0", "1.9", "1.7", "34.7"] //データ
          }
        ]
      },
      options: {
        maintainAspectRatio: false, //CSSで大きさを調整するため、自動縮小をさせない
        legend: {
          display: true //グラフの説明を表示
        },
        tooltips: {
          //グラフへカーソルを合わせた際の詳細表示の設定
          callbacks: {
            label: function (tooltipItem, data) {
              return (
                data.labels[tooltipItem.index] +
                ": " +
                data.datasets[0].data[tooltipItem.index] +
                "%"
              ); //%を最後につける
            }
          }
        },
        title: {
          //上部タイトル表示の設定
          display: true,
          fontSize: 10,
          text: "単位:%"
        }
      }
    });
  }
});

              
            
!
999px

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