My-HTML-CSS-JAVASCRIPT-Mini-Projects/trackingeyes.html at main · KalamPinjar/My-HTML-CSS-JAVASCRIPT-Mini-Projects · 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>Document</title>
    <style>
        body {

            padding: 0;
            margin: 0;
            box-sizing: border-box;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            /* background: ; */
        }

        .emoji-face {
            position: relative;
            width: 200px;
            height: 200px;
            background: transparent;
            /* background: rgba(255,255,0,0.683); */
            border: 5px solid black;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            transition: 0.5s;
        }

/*
        .emoji-face::before {
            content: '';
            top: 180px;
            position: absolute;
            width: 150px;
            background: crimson;
            height: 70px;
            border-bottom-left-radius: 70px;
            border-bottom-right-radius: 70px;
            transition: 0.5s;
        } */

        .eyes {
            position: relative;
            width: 100px;
            height: 100px;
            display: flex;
            justify-content: center;
            align-items: center;
            border: 5px solid black;
            border-radius: 100%;
        }

        .eyes .eye {
            position: relative;
            width:100%;
            height: 100%;
            display: block;
            background: white;
            border-radius: 50%;
        }

        .eyes .eye::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 25px;
            transform: translate(-50%, -50%);
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: #000;
        }
    </style>
</head>

<body>
    <!-- <div class="emoji-face"> -->
        <div class="eyes">
            <div class="eye"></div>
            <!-- <div class="eye"></div> -->
        </div>
    <!-- </div> -->

    <script>
        document.querySelector('body').addEventListener("mousemove", eyeball);

        function eyeball() {
            let eyes = document.querySelectorAll(".eye")
            eyes.forEach(eye => {
                let x = eye.getBoundingClientRect().left + eye.clientWidth / 2;
                let y = eye.getBoundingClientRect().top + eye.clientHeight / 2;


                let radian = Math.atan2(event.pageX - x, event.pageY - y)
                let rotate = radian * (180 / Math.PI) * -1 + 270;
                eye.style.transform = `rotate(${rotate}deg)`;

            })
        }

    </script>
</body>

</html>