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CSS

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JavaScript

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HTML 

              
                <div id="startElement">開始位置</div>
<div id="endElement">終了位置</div>
<script src="https://cdn.jsdelivr.net/npm/leader-line@1.0.1/leader-line.min.js"></script>
!

CSS 

              
                /* 開始位置の要素 */
#startElement {
  /* 高さ */
  height: 4em;
  /* 幅 */
  width: 4em;
  /* 背景色 */
  background-color: lightpink;
}

/* 終了位置の要素 */
#endElement {
  /* マージン */
  margin-top: 100px;
  margin-left: 120px;
  /* 高さ */
  height: 4em;
  /* 幅 */
  width: 4em;
  /* 背景色 */
  background-color: lightblue;
}
!

JS 

              
                // 開始位置の要素
const start = document.getElementById("startElement");
// 終了位置の要素
const end = document.getElementById("endElement");

/** 線を弾くleader-line.jsの関数
 * start 開始位置の要素,
 * end 終了位置の要素,
 * {}内のオプション その他設定
 */
new LeaderLine(
  // ホバーしたら線を引く
  // LeaderLine.mouseHoverAnchor(start),
  start,
  // 終了位置の要素を枠で囲う
  LeaderLine.areaAnchor(end),
  // その他オプション
  {
    x:"100%",
    // 線の形状
    path: "straight", // 直線
    // 線の色
    color: "red",
    // 線の太さ
    size: 2,
    // 開始位置の形状
    startPlug: "square", // 四角形
    startPlugSize: 2,
    // 終了位置の形状
    endPlug: "arrow3", // 矢印
    endPlugSize: 3,
    // アニメーション
    dash: { animation: true },
    // テキスト
    startLabel: LeaderLine.pathLabel({
      text: "線に沿ったテキスト",
      color: "pink",
      background: "gray",
    }),
    middleLabel: "中間位置のテキスト",
    endLabel: "終了位置のテキスト",
  }
);
!
999px

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