Easier usage with d3.geoProject? about d3-geo-polygon

[Fil]

Yes; it would be nice to have this also for clipAngle — in your notebook it works by using:

{
  const clipAngle = d3.geoClipCircle(50/180*Math.PI);
  return d3.geoProject(land, {stream: stream => radians(clipAngle(degrees(stream)))});
}

(So maybe an issue to solve in d3-geo-projection rather than d3-geo-polygon.)

We should also account for rotation.

Since your code is working, is it not just a question of defining a syntax?

The polygon issue is similar to d3/d3-geo-projection#146 (comment) : d3.geoProject is not meant to be used to project to spherical coordinates.

[mbostock]

Yep, an issue of syntax and abstraction. I would love to revisit the composable geographic projection pipeline idea. I wonder if there is some progress to be made there.