{
replay;
const step = 0.02;
const startR = 75;
const height = startR * 5;
const startX = 250;
const startY = height / 2;
const curveX = startX + startR * 2;
const paths = Array.from({ length: count }, () => []);
const color = d3.scaleLinear([0, count], [1, 0]);
const strokeWidth = d3.scaleLinear([0, count], [5, 1.5]);
const strokeOpacity = d3.scaleLinear([0, count], [0.7, 1]);
const shared = {
stroke: (d, i) => d3.interpolatePuRd(color(i)),
"stroke-width": (d, i) => strokeWidth(i),
"stroke-opacity": (d, i) => strokeOpacity(i)
};
let time = -0.1;
while (true) {
time += step;
const links = [];
const circles = [];
const points = [];
let px = startX;
let py = startY;
const max = Math.min(count, ((time / (Math.PI * 2)) | 0) + 1);
for (let i = 0; i < max; i++) {
const n = i * 2 + 1;
const radius = startR * (4 / (n * Math.PI));
const x = px + radius * Math.cos(n * time);
const y = py + radius * Math.sin(n * time);
links.push({ x1: px, y1: py, x2: x, y2: y });
circles.push({ x: px, y: py, r: radius });
points.push([x, y]);
paths[i].unshift(y);
px = x;
py = y;
}
for (const Y of paths) if (Y.length > width) Y.pop();
yield SVG.svg({
width,
height,
style: "background:black",
stroke: "white",
"stroke-width": 1.5,
children: [
SVG.circle(circles, {
cx: (d) => d.x,
cy: (d) => d.y,
r: (d) => d.r,
...shared
}),
SVG.line(links, {
x1: (d) => d.x1,
y1: (d) => d.y1,
x2: (d) => d.x2,
y2: (d) => d.y2,
...shared
}),
SVG.path(paths, {
d: (Y) =>
d3
.line()
.x((d, i) => curveX + i)
.y((d) => d)(Y),
fill: "none",
...shared
}),
SVG.line(points, {
x1: (d) => d[0],
y1: (d) => d[1],
x2: curveX,
y2: (d) => d[1],
...shared
})
]
});
}
}
SVG = cm.SVG
cm = require(await FileAttachment("charming@1.umd.min.js").url())
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