Spectral burst

A burst of prismatic light rays fans out from a bright core, leans toward the pointer and sends a wave of light outward on click.

element
rays
burst
spectrum
pointer
shader
since 0.2

Background Studio: tune it below, then copy the code

Your system asks for reduced motion: the demo shows its final state and nothing moves.

Live demo

Spectral burst example

Code

It follows the controls above: change an option and the code changes with it.

<script src="https://search.axi0.io/axi0/motion/motion.js" defer></script>

<axi0-spectral-burst cover></axi0-spectral-burst>

import { SpectralBurst } from "./motion/react/SpectralBurst";

<SpectralBurst />

<script setup lang="ts">
import SpectralBurst from "./motion/vue/SpectralBurst.vue";
</script>

<template>
  <SpectralBurst />
</template>

const fx = document.createElement("axi0-spectral-burst");
document.querySelector("#hero").append(fx);

The wrappers: SpectralBurst.tsx (React, TypeScript) and SpectralBurst.vue (Vue). Both render the same attributes as the HTML; the loader does the rest.

Options

Attribute	Default	What it does
`rays`	`22`	How many rays
`lean`	`1`	How far the core leans toward the pointer
`colors`	auto	Colors, comma separated (empty: the palette for the page's theme)
`background`	auto	Background color (empty: the theme's)
`speed`	`1`	How fast it moves
`theme`	`auto`	Light or dark palette (auto: from the page behind it)
`cover`	`false`	Fill the nearest positioned parent, behind its content

Decorative: the canvas is aria-hidden and takes no focus; with cover it ignores the pointer, so the content above it stays clickable and readable. With no pointer the core drifts on its own, so touch and keyboard users see the same scene; a tap sends the wave like a click. Drawn by the shared WebGL runner below device resolution (never more than one pixel per CSS pixel, device pixel ratio capped at 2); it starts when it comes within 300 px of the screen, the frame loop stops off screen and in hidden tabs, and reduced motion draws one still frame with no movement. Without WebGL it shows a still gradient in its own colors.

Size

spectral-burst.js is 0.8 KB gzip, with gl.js 2.1 KB and backgrounds-kit.js 3.4 KB it needs. A page loads the loader (2.9 KB) and core.js (1.4 KB) once, whatever it uses.