@thi.ng/geom/internal/collate.js

Functional, polymorphic API for 2D geometry types & SVG generation

const __remapBuffer = (buf, pts, start, cstride, estride) => {
  for (let i = pts.length; i-- > 0; ) {
    const p = pts[i];
    p.buf = buf;
    p.offset = start + i * estride;
    p.stride = cstride;
  }
  return buf;
};
const __collateWith = (fn, pts, opts, stride) => {
  opts = {
    start: 0,
    cstride: 1,
    estride: stride,
    ...opts
  };
  const { start, cstride, estride } = opts;
  return __remapBuffer(
    fn(
      opts.buf || new Array(start + pts.length * estride).fill(0),
      pts,
      start,
      cstride,
      estride
    ),
    pts,
    start,
    cstride,
    estride
  );
};
export {
  __collateWith,
  __remapBuffer
};