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feat(pulse): slower, brighter, comet-shaped pulse along paths

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Slower (9-13s per glide vs 4.5-6.5s), three-layer comet shape
(soft halo + mid glow + bright core), rotated to path tangent,
ease-in-out timing, mix-blend-mode screen.

Fixes: pulse not tracking path was a parallax-offset coordinate
mismatch. Cleaned up via getSpeedKey() helper.
This commit is contained in:
Linus Olofsson
2026-05-20 22:56:35 +02:00
parent 33c9ea4157
commit 7bad958a38
1 changed files with 100 additions and 41 deletions
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src/components/WaveBackground.astro
+100 -41
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@@ -4,8 +4,9 @@ const { opacity = "opacity-30", theme = "cyan" } = Astro.props;
const mainColor = theme === 'purple' ? '#c026d3' : '#4fd1c5';
const secondaryColor = theme === 'purple' ? '#db2777' : '#22d3ee';
const pulseMain = theme === 'purple' ? '#e879f9' : '#67e8f9';
const pulseSec = theme === 'purple' ? '#f472b6' : '#a5f3fc';
const pulseMain = theme === 'purple' ? '#f0abfc' : '#a5f3fc';
const pulseSec = theme === 'purple' ? '#fbcfe8' : '#cffafe';
const pulseCore = '#ffffff';
---
<div
@@ -14,7 +15,7 @@ const pulseSec = theme === 'purple' ? '#f472b6' : '#a5f3fc';
data-pulse-main={pulseMain}
data-pulse-sec={pulseSec}
>
<svg id="wave-svg" class="w-full h-full" xmlns="http://www.w3.org/2000/svg">
<svg id="wave-svg" class="w-full h-full" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="none">
<defs>
<linearGradient id="gradMain" x1="0%" y1="0%" x2="100%" y2="0%">
<stop offset="0%" style={`stop-color:${mainColor};stop-opacity:0`} />
@@ -28,15 +29,33 @@ const pulseSec = theme === 'purple' ? '#f472b6' : '#a5f3fc';
<stop offset="100%" style={`stop-color:${secondaryColor};stop-opacity:0`} />
</linearGradient>
<filter id="pulseBlur" x="-50%" y="-50%" width="200%" height="200%">
<feGaussianBlur stdDeviation="6" />
<filter id="pulseGlowSoft" x="-100%" y="-100%" width="300%" height="300%">
<feGaussianBlur stdDeviation="22" />
</filter>
<filter id="pulseGlowMid" x="-100%" y="-100%" width="300%" height="300%">
<feGaussianBlur stdDeviation="9" />
</filter>
<filter id="pulseGlowSharp" x="-100%" y="-100%" width="300%" height="300%">
<feGaussianBlur stdDeviation="2.5" />
</filter>
<radialGradient id="pulseGradient">
<stop offset="0%" style={`stop-color:${pulseMain};stop-opacity:1`} />
<stop offset="60%" style={`stop-color:${pulseMain};stop-opacity:0.4`} />
<radialGradient id="pulseHaloGradient">
<stop offset="0%" style={`stop-color:${pulseMain};stop-opacity:0.85`} />
<stop offset="40%" style={`stop-color:${pulseMain};stop-opacity:0.35`} />
<stop offset="100%" style={`stop-color:${pulseMain};stop-opacity:0`} />
</radialGradient>
<radialGradient id="pulseMidGradient">
<stop offset="0%" style={`stop-color:${pulseSec};stop-opacity:1`} />
<stop offset="60%" style={`stop-color:${pulseSec};stop-opacity:0.5`} />
<stop offset="100%" style={`stop-color:${pulseSec};stop-opacity:0`} />
</radialGradient>
<radialGradient id="pulseCoreGradient">
<stop offset="0%" style={`stop-color:${pulseCore};stop-opacity:1`} />
<stop offset="50%" style={`stop-color:${pulseCore};stop-opacity:0.6`} />
<stop offset="100%" style={`stop-color:${pulseCore};stop-opacity:0`} />
</radialGradient>
</defs>
<g id="wave-group">
@@ -51,7 +70,11 @@ const pulseSec = theme === 'purple' ? '#f472b6' : '#a5f3fc';
<g id="box-trail-group"></g>
<g id="pulse-group">
<circle id="pulse-blob" r="14" fill="url(#pulseGradient)" filter="url(#pulseBlur)" opacity="0" />
<g id="pulse-blob" opacity="0">
<ellipse id="pulse-halo" rx="55" ry="22" fill="url(#pulseHaloGradient)" filter="url(#pulseGlowSoft)" />
<ellipse id="pulse-mid" rx="32" ry="11" fill="url(#pulseMidGradient)" filter="url(#pulseGlowMid)" />
<ellipse id="pulse-core" rx="14" ry="4" fill="url(#pulseCoreGradient)" filter="url(#pulseGlowSharp)" />
</g>
</g>
</svg>
</div>
@@ -65,12 +88,24 @@ const pulseSec = theme === 'purple' ? '#f472b6' : '#a5f3fc';
const thread1 = document.getElementById('thread1') as SVGPathElement | null;
const thread2 = document.getElementById('thread2') as SVGPathElement | null;
const svg = document.getElementById('wave-svg') as unknown as SVGSVGElement | null;
const blob = document.getElementById('pulse-blob') as SVGCircleElement | null;
const blobGroup = document.getElementById('pulse-blob') as SVGGElement | null;
const halo = document.getElementById('pulse-halo') as SVGEllipseElement | null;
const mid = document.getElementById('pulse-mid') as SVGEllipseElement | null;
const core = document.getElementById('pulse-core') as SVGEllipseElement | null;
const boxGroup = document.getElementById('box-trail-group') as SVGGElement | null;
const wrapper = svg?.parentElement;
const speeds: Speeds = { w1: 0.5, w2: -0.8, w3: 1.2, t1: 1.8, t2: -1.5 };
function getSpeedKey(id: string): keyof Speeds | null {
if (id === 'wave1') return 'w1';
if (id === 'wave2') return 'w2';
if (id === 'wave3') return 'w3';
if (id === 'thread1') return 't1';
if (id === 'thread2') return 't2';
return null;
}
function onScroll() {
const scrollY = window.scrollY;
if (wave1) wave1.style.transform = `translateX(${scrollY * speeds.w1}px)`;
@@ -81,15 +116,15 @@ const pulseSec = theme === 'purple' ? '#f472b6' : '#a5f3fc';
}
window.addEventListener('scroll', onScroll, { passive: true });
if (svg && blob && wrapper) {
const pulseMain = wrapper.getAttribute('data-pulse-main') || '#67e8f9';
const pulseSec = wrapper.getAttribute('data-pulse-sec') || '#a5f3fc';
if (svg && blobGroup && halo && mid && core && wrapper) {
const pulseMain = wrapper.getAttribute('data-pulse-main') || '#a5f3fc';
const pulseSec = wrapper.getAttribute('data-pulse-sec') || '#cffafe';
const wavePaths = Array.from(document.querySelectorAll<SVGPathElement>('[data-pulse-path="true"]'));
const NS = 'http://www.w3.org/2000/svg';
function buildBoxPath(rect: DOMRect): string {
const r = 14;
const r = 16;
const x = rect.left;
const y = rect.top;
const w = rect.width;
@@ -134,11 +169,26 @@ const pulseSec = theme === 'purple' ? '#f472b6' : '#a5f3fc';
return created;
}
function updatePulseColors(isSecondary: boolean) {
const haloColor = isSecondary ? pulseSec : pulseMain;
const midColor = isSecondary ? pulseMain : pulseSec;
const haloStops = document.querySelectorAll('#pulseHaloGradient stop');
if (haloStops[0]) haloStops[0].setAttribute('style', `stop-color:${haloColor};stop-opacity:0.85`);
if (haloStops[1]) haloStops[1].setAttribute('style', `stop-color:${haloColor};stop-opacity:0.35`);
if (haloStops[2]) haloStops[2].setAttribute('style', `stop-color:${haloColor};stop-opacity:0`);
const midStops = document.querySelectorAll('#pulseMidGradient stop');
if (midStops[0]) midStops[0].setAttribute('style', `stop-color:${midColor};stop-opacity:1`);
if (midStops[1]) midStops[1].setAttribute('style', `stop-color:${midColor};stop-opacity:0.5`);
if (midStops[2]) midStops[2].setAttribute('style', `stop-color:${midColor};stop-opacity:0`);
}
let currentTimeout: number | null = null;
let isPulsing = false;
function runPulse(path: SVGPathElement, duration = 4500) {
if (!blob) return;
function runPulse(path: SVGPathElement, duration = 9000) {
if (!blobGroup || !halo || !mid || !core) return;
isPulsing = true;
const length = path.getTotalLength();
const startTime = performance.now();
@@ -146,42 +196,45 @@ const pulseSec = theme === 'purple' ? '#f472b6' : '#a5f3fc';
(path.getAttribute('stroke') || '').includes('gradSec') ||
path.id === 'thread1' ||
path.id === 'thread2';
const color = isSecondary ? pulseSec : pulseMain;
updatePulseColors(isSecondary);
const grad = document.querySelector('#pulseGradient stop:first-child') as SVGStopElement | null;
const gradMid = document.querySelectorAll('#pulseGradient stop')[1] as SVGStopElement | null;
if (grad) grad.setAttribute('style', `stop-color:${color};stop-opacity:1`);
if (gradMid) gradMid.setAttribute('style', `stop-color:${color};stop-opacity:0.4`);
const speedKey = getSpeedKey(path.id);
function step(now: number) {
if (!blob) return;
if (!blobGroup || !halo || !mid || !core) return;
const elapsed = now - startTime;
const t = Math.min(elapsed / duration, 1);
const pt = path.getPointAtLength(t * length);
const eased = t < 0.5
? 2 * t * t
: 1 - Math.pow(-2 * t + 2, 2) / 2;
let pathTx = 0;
const speedKey =
path.id === 'wave1' ? 'w1'
: path.id === 'wave2' ? 'w2'
: path.id === 'wave3' ? 'w3'
: path.id === 'thread1' ? 't1'
: path.id === 'thread2' ? 't2'
: null;
if (speedKey) pathTx = window.scrollY * speeds[speedKey as keyof Speeds];
const pt = path.getPointAtLength(eased * length);
blob.setAttribute('cx', String(pt.x + pathTx));
blob.setAttribute('cy', String(pt.y));
const sampleDelta = Math.max(1, length * 0.002);
const before = path.getPointAtLength(Math.max(0, eased * length - sampleDelta));
const after = path.getPointAtLength(Math.min(length, eased * length + sampleDelta));
const dx = after.x - before.x;
const dy = after.y - before.y;
const angle = Math.atan2(dy, dx) * (180 / Math.PI);
const pathTx = speedKey ? window.scrollY * speeds[speedKey] : 0;
const cx = pt.x + pathTx;
const cy = pt.y;
blobGroup.setAttribute('transform', `translate(${cx} ${cy}) rotate(${angle})`);
let opacity = 0;
if (t < 0.15) opacity = t / 0.15;
else if (t > 0.85) opacity = (1 - t) / 0.15;
if (t < 0.18) opacity = (t / 0.18);
else if (t > 0.82) opacity = ((1 - t) / 0.18);
else opacity = 1;
blob.setAttribute('opacity', String(opacity * 0.9));
opacity = Math.max(0, Math.min(1, opacity));
blobGroup.setAttribute('opacity', String(opacity));
if (t < 1) {
requestAnimationFrame(step);
} else {
blob.setAttribute('opacity', '0');
blobGroup.setAttribute('opacity', '0');
isPulsing = false;
}
}
@@ -201,13 +254,16 @@ const pulseSec = theme === 'purple' ? '#f472b6' : '#a5f3fc';
}
const choice = allTargets[Math.floor(Math.random() * allTargets.length)];
const isBox = choice.getAttribute('data-trail-box-path') === 'true';
runPulse(choice, isBox ? 3500 : 4500 + Math.random() * 2000);
const duration = isBox
? 7000 + Math.random() * 2000
: 9000 + Math.random() * 4000;
runPulse(choice, duration);
schedule();
}
function schedule() {
if (currentTimeout) clearTimeout(currentTimeout);
const delay = 2500 + Math.random() * 4500;
const delay = 3500 + Math.random() * 5500;
currentTimeout = window.setTimeout(pickAndPulse, delay);
}
@@ -222,7 +278,10 @@ const pulseSec = theme === 'purple' ? '#f472b6' : '#a5f3fc';
will-change: transform;
}
#pulse-blob {
transition: opacity 0.05s linear;
mix-blend-mode: screen;
}
#pulse-blob ellipse {
transform-box: fill-box;
transform-origin: center;
}
</style>