In this example, we'll explore how to use Trig.js to create a pinned text effect where the text rotates on scroll while an underline grows dynamically.

📌 Live Demo: Check out the CodePen

✨ What This Does

  • The text remains pinned in the viewport.
  • The "JS" part of "TRIG.JS" rotates based on scroll position.
  • The underline grows dynamically as you scroll down.

🚀 The Code Breakdown

1️⃣ Setting Up the HTML 

</span>
 lang="en">

    Pinned Spinning Text and Growing Underline Using Trig.js
    <span class="na">src="https://cdn.jsdelivr.net/npm/trig-js/src/trig.min.js">
     rel="preconnect" href="https://fonts.googleapis.com">
     rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     href="https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Space+Mono&display=swap" rel="stylesheet">
     name="viewport" content="width=device-width, initial-scale=1">

 class="trig-scroll-up trig-scroll-25">
     class="container">
         class="pinContainer" data-trig data-trig-degrees="true" data-trig-var="true" data-trig-min="-200" data-trig-max="200">
             class="pinned">
                 id="title">TRIG. class="rotate">JS
            
        
         class="container">
             class="alignCenter">
                Pinned Spinning Text and Growing Underline
            
        
    





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  2️⃣ Styling with CSS

body {
    margin: 0;
    padding: 0;
    background-image: linear-gradient(to right top, #090c11, #040b1a, #030821, #050527, #0b002c);
    color: #FFF;
    font-family: 'Space Mono', monospace;
}

h1 {
    font-family: 'Bebas Neue', cursive;
    color: #FFF;
    text-shadow: 2px 2px 2px #000000;
    font-size: 72px;
}

.pinned {
    display: inline-block;
    position: sticky;
    top: 30%;
}

.rotate {
    transform-style: preserve-3d;
    transform: rotateX(calc(var(--trig-deg) - 47deg)) perspective(800px);
    transition: transform ease-out 0.3s;
    display: inline-block;
}

#title:after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    transform-origin: left;
    width: 100%;
    height: 8px;
    display: inline-block;
    background-color: #FFF;
    transform: scaleX(calc(var(--trig) - 13%));
    transition: transform ease-out 0.3s;
}



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  🔥 How It Works

The .pinned class keeps the text fixed in place using position: sticky;.
The .rotate class applies rotateX() based on the scroll position, using var(--trig-deg) from Trig.js.
The #title:after underline grows dynamically with scaleX(calc(var(--trig) - 13%)).

data-trig on .pinContainer enables Trig.js animations.

  
  
  🎯 Why Use Trig.js?


Lightweight (Only 4KB!) 🚀
No dependencies
Highly customizable
Smooth scroll animations

  
  
  📢 Final Thoughts
This example showcases how simple yet powerful Trig.js can be for scroll-based animations. You can easily tweak the values or expand on this effect.Want to see more? Check out:
Trig.js GitHub Repository
More Examples
💬 Let me know what you think in the comments below! Happy coding! 🚀