Created
December 8, 2019 23:56
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Looping exploding dots
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<title>Chaos</title> | |
</head> | |
<body> | |
<script src="https://unpkg.com/pencil.js"></script> | |
<script src="https://unpkg.com/@pencil.js/gif"></script> | |
<script> | |
const { gif, OffScreenCanvas, Circle, RegularPolygon, Position, Math: M } = Pencil; | |
const scene = new OffScreenCanvas(568, 350, { | |
fill: "#222", | |
}); | |
const { width, height } = scene; | |
const pointsOptions = { | |
fill: "#fff", | |
}; | |
const pointsRadius = 5; | |
const points = []; | |
const nbCircles = 21; | |
const margin = (height / 2) / nbCircles; | |
const norm = new Position(1, 0); | |
for (let i = 3; i < nbCircles; ++i) { | |
const nbPoints = i * 3; | |
const circles = RegularPolygon.getRotatingPoints(nbPoints, i * margin, i / (nbCircles * 3)) | |
.map((circle, j) => { | |
const radius = M.map((i / nbCircles) ** 3, 0, 1, pointsRadius, 1); | |
const targets = [ | |
circle.add(scene.center), | |
new Position((j + 0.5) * (width / nbPoints), (i - 0.5) * (height / nbCircles)), | |
]; | |
const speed = norm.clone().rotate(M.random()).multiply(radius * 3); | |
const delay = M.random(10); | |
return new Circle(targets[targets.length - 1].clone(), radius, { | |
...pointsOptions, | |
opacity: radius / pointsRadius, | |
targets, | |
speed, | |
delay, | |
}); | |
}); | |
points.push(...circles); | |
} | |
scene.add(...points); | |
const nbFrames = 500; | |
const easeInOut = (t) => { | |
return t < 0.5 ? | |
4 * (t ** 3) : | |
(0.5 * (((2 * t) - 2) ** 3)) + 1; | |
}; | |
scene.on("draw", () => { | |
const movingFrames = nbFrames / 4; | |
points.forEach((point) => { | |
const to = point.options.targets[(Math.floor(point.frameCount / movingFrames) / 2) - 0.5]; | |
const time = Math.max(0, ((point.frameCount % movingFrames) / movingFrames) - (point.options.delay / movingFrames)); | |
if (to) { | |
const ratio = easeInOut(time); | |
point.position.lerp(to, ratio); | |
} | |
else { | |
point.position.add(point.options.speed.clone().multiply((1 - time) ** 2)); | |
} | |
}); | |
}, true); | |
console.log("Working ..."); | |
console.time("gif"); | |
gif(scene, nbFrames).then((img) => { | |
console.timeEnd("gif"); | |
document.body.appendChild(img); | |
}); | |
</script> | |
</body> | |
</html> |
Author
GMartigny
commented
May 7, 2020
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