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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>2 0 2 0</title>
<style>
body {
padding: 0;
margin: 0;
background: black;
width: 100vw;
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
svg {
width: 100vmin;
}
.virus-stroke {
stroke:#c413c6;
stroke-width: 2;
fill: none;
opacity: 0.9;
}
.virus-stroke-1 {
opacity: 0.6;
stroke-width: 1.5;
stroke: #05a3ca;
}
.virus-stroke-2 {
opacity: 0.4;
stroke-width: 1.5;
stroke: #ddd507;
}
.virus-stroke-3 {
opacity: 0.4;
stroke-width: 1.5;
stroke: #17961d;
}
</style>
</head>
<body>
<svg viewBox="0 0 1050 1050">
<g>
<path class="virus-stroke virus-stroke-3" />
<path class="virus-stroke virus-stroke-2" />
<path class="virus-stroke virus-stroke-1" />
<path class="virus-stroke" />
</g>
</svg>
<script src="js/simplex-noise.js"></script>
<script>
const pathObj = [
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endPoint: [560.5, 100]
},
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controlPointStart: [
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endPoint: [83.5, 680.5]
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endPoint: [61.5, 390.7]
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endPoint: [145.5, 367]
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controlPointEnd: [
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],
endPoint: [207.5, 263]
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controlPointEnd: [
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endPoint: [277.5, 220]
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controlPointEnd: [
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endPoint: [377.5, 171]
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controlPointEnd: [
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endPoint: [354.5, 123]
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controlPointEnd: [
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],
endPoint: [411.5, 116]
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controlPointEnd: [
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endPoint: [433.5, 156]
}, {
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],
controlPointEnd: [
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],
endPoint: [560.5, 100]
}
]
const simplex = new SimplexNoise('seed')
const getRandomTranslate = (x, y) => ({
r: 12 * simplex.noise2D(x, y),
theta: Math.PI * simplex.noise2D(x, -y)
})
const getTranslatedPoint = ([ x0, y0 ], { r, theta }) => ([
x0 + r * Math.cos(theta),
y0 + r * Math.sin(theta),
])
const getCurrentPoint = ([ x0, y0 ], timestamp, i) => (
getTranslatedPoint([ x0, y0 ], getRandomTranslate(timestamp, i))
)
const getNewCurrentPathStr = (timestamp, offset) => {
const currentPathObj = pathObj.map((segment, i) => ({
...segment,
endPoint: getCurrentPoint(segment.endPoint, (timestamp + offset) / 3333, i)
}))
currentPathObj[currentPathObj.length - 1].endPoint = currentPathObj[0].endPoint
return currentPathObj.reduce(
(str, { controlPointStart, controlPointEnd, endPoint }, i) => (
str + (
i === 0
? `M${endPoint.join(',')}`
: `C${controlPointStart.join(',')},${controlPointEnd.join(',')},${endPoint.join(',')}`
)
), '')
}
const animateVirus = timestamp => {
const virusStrokeEls = document.getElementsByClassName('virus-stroke')
Array.from(virusStrokeEls).forEach((virusStrokeEl, i) => {
const pathStr = getNewCurrentPathStr(timestamp, i * 10000)
virusStrokeEl.setAttribute('d', pathStr)
})
window.requestAnimationFrame(animateVirus)
}
window.requestAnimationFrame(animateVirus)
</script>
</body>
</html>