Sweeping a point makes a one-dimensional path, which is a polyline. Since we have swept with a rotation, the result is a circular arc. Here is what it looks like.
This is the first example we have seen of sketch arithmetic.
The expression 180 / n_segs causes the eight rotations to add
to 180. If you're paying attention, you'll have already noted that
there are nine points, producing eight line segments.
You can cause the swept point to generate a single polygon rather than a polyline by using the closure tag <> after the number of swept objects. Code and result follow
def n_segs 8
sweep { n_segs<>, rotate(180 / n_segs, (0,0,0), [0,0,1]) } (1,0,0)
