geometric.polygonInterpolate(polygon[, clamp]) returns an interpolator function given a polygon of vertices [a, b, ..., n]. The returned interpolator function takes a single argument t, where t is a number in [0, 1]; a value of 0 returns a, while a value of 1 returns n. Intermediate values interpolate from a to n along the polygon's perimeter.

You can pass an optional boolean, which defaults to true, indicating whether to clamp t to the range [0, 1]. When clamp is false, the interpolator applies modular arithmetic to t. If t is less than 0, the interpolator wraps around the polygon's perimeter in reverse. If t is greater than 1, the interpolator continues forward along the perimeter.

Adjust t to move the interpolated point along the selected polygon's perimeter.