Tracing Beam
A Beam that follows the path of an SVG as the user scrolls. Adjusts beam length with scroll speed.
React
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Changelog
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Launch Week
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Installation
Install dependencies
npm i framer-motion clsx tailwind-mergeAdd util file
import { ClassValue, clsx } from "clsx";
import { twMerge } from "tailwind-merge";
export function cn(...inputs: ClassValue[]) {
return twMerge(clsx(inputs));
}Add the following code in tailwind.config.js file
const defaultTheme = require("tailwindcss/defaultTheme");
const colors = require("tailwindcss/colors");
const {
default: flattenColorPalette,
} = require("tailwindcss/lib/util/flattenColorPalette");
/** @type {import('tailwindcss').Config} */
module.exports = {
content: ["./src/**/*.{ts,tsx}"],
darkMode: "class",
theme: {
// rest of the code
},
plugins: [
// rest of the code
addVariablesForColors,
],
};
// This plugin adds each Tailwind color as a global CSS variable, e.g. var(--gray-200).
function addVariablesForColors({ addBase, theme }: any) {
let allColors = flattenColorPalette(theme("colors"));
let newVars = Object.fromEntries(
Object.entries(allColors).map(([key, val]) => [`--${key}`, val])
);
addBase({
":root": newVars,
});
}Copy the source code
components/ui/tracing-beam.tsx
"use client";
import React, { useEffect, useRef, useState } from "react";
import {
motion,
useTransform,
useScroll,
useVelocity,
useSpring,
} from "framer-motion";
import { cn } from "@/utils/cn";
export const TracingBeam = ({
children,
className,
}: {
children: React.ReactNode;
className?: string;
}) => {
const ref = useRef<HTMLDivElement>(null);
const { scrollYProgress } = useScroll({
target: ref,
offset: ["start start", "end start"],
});
const contentRef = useRef<HTMLDivElement>(null);
const [svgHeight, setSvgHeight] = useState(0);
useEffect(() => {
if (contentRef.current) {
setSvgHeight(contentRef.current.offsetHeight);
}
}, []);
const y1 = useSpring(
useTransform(scrollYProgress, [0, 0.8], [50, svgHeight]),
{
stiffness: 500,
damping: 90,
}
);
const y2 = useSpring(
useTransform(scrollYProgress, [0, 1], [50, svgHeight - 200]),
{
stiffness: 500,
damping: 90,
}
);
return (
<motion.div
ref={ref}
className={cn("relative w-full max-w-4xl mx-auto h-full", className)}
>
<div className="absolute -left-4 md:-left-20 top-3">
<motion.div
transition={{
duration: 0.2,
delay: 0.5,
}}
animate={{
boxShadow:
scrollYProgress.get() > 0
? "none"
: "rgba(0, 0, 0, 0.24) 0px 3px 8px",
}}
className="ml-[27px] h-4 w-4 rounded-full border border-netural-200 shadow-sm flex items-center justify-center"
>
<motion.div
transition={{
duration: 0.2,
delay: 0.5,
}}
animate={{
backgroundColor:
scrollYProgress.get() > 0 ? "white" : "var(--emerald-500)",
borderColor:
scrollYProgress.get() > 0 ? "white" : "var(--emerald-600)",
}}
className="h-2 w-2 rounded-full border border-neutral-300 bg-white"
/>
</motion.div>
<svg
viewBox={`0 0 20 ${svgHeight}`}
width="20"
height={svgHeight} // Set the SVG height
className=" ml-4 block"
aria-hidden="true"
>
<motion.path
d={`M 1 0V -36 l 18 24 V ${svgHeight * 0.8} l -18 24V ${svgHeight}`}
fill="none"
stroke="#9091A0"
strokeOpacity="0.16"
transition={{
duration: 10,
}}
></motion.path>
<motion.path
d={`M 1 0V -36 l 18 24 V ${svgHeight * 0.8} l -18 24V ${svgHeight}`}
fill="none"
stroke="url(#gradient)"
strokeWidth="1.25"
className="motion-reduce:hidden"
transition={{
duration: 10,
}}
></motion.path>
<defs>
<motion.linearGradient
id="gradient"
gradientUnits="userSpaceOnUse"
x1="0"
x2="0"
y1={y1} // set y1 for gradient
y2={y2} // set y2 for gradient
>
<stop stopColor="#18CCFC" stopOpacity="0"></stop>
<stop stopColor="#18CCFC"></stop>
<stop offset="0.325" stopColor="#6344F5"></stop>
<stop offset="1" stopColor="#AE48FF" stopOpacity="0"></stop>
</motion.linearGradient>
</defs>
</svg>
</div>
<div ref={contentRef}>{children}</div>
</motion.div>
);
};Props
| Prop name | Type | Description |
|---|---|---|
className | string | The class name of the child component. |
children | React.ReactNode | The contents of your page |