画面をこするとページ遷移するコード

画面をこするとページ遷移するコード
https://teratail.com/questions/j459osplrnxfeo

「こする」をどうとらえるか？

<!DOCTYPE html>
<meta charset="utf-8">
<title></title>
<style>
</style>

<body>

<a href="https://www.google.co.jp/">
  <img src="https://picsum.photos/600/200?random=1"><br>
  <p>Test</p>
</a>

<script>


class A {
  #clientX = null;
  #clientY = null;

  constructor (target, limit = 600) {
    this.target = target;
    this.limit = limit;
    this.distance = null;

    this.clientX = null;
    this.clientY = null;

    document.addEventListener ('mousemove', this, false);
  }

  targetOut () {
    this.distance = this.#clientX = this.#clientY = null;
    return this;
  }

  targetIn (event) {
    this.distance = 1;
    this.#clientX = event.clientX;
    this.#clientY = event.clientY;
  }

  targetMove (event) {
    let { clientX: x, clientY: y } = event;
    this.distance += (
      (this.#clientX - x) ** 2 +
      (this.#clientY - y) ** 2
    ) **.5;

    if (this.distance < this.limit) {
      this.#clientX = x;
      this.#clientY = y;
//      console.log(this.distance);
    }
    else {
      this.target.click ();
    }
  }

  handleEvent (event) {
    let e = event.target;
    if (this.target.contains (e)) {
      if (! this.distance)
        this.targetIn (event);
      this.targetMove (event);
    } else {
      this.targetOut (); 
    }
  }
}

let a = new A (document.querySelector ('a'));

</script>

画面をこするとページ遷移するコードhttps://teratail.com/questions/j459osplrnxfeo

画面をこするとページ遷移するコード
https://teratail.com/questions/j459osplrnxfeo