    path.closestPoint(point [, opt])

Return the point on the path that lies closest to `point`.

Invisible segments (e.g. Moveto segments) have no length and are therefore skipped by the algorithm. If the path contains no visible segments, the `end` point of the last segment is returned. If the path has no segments at all, `null` is returned.

The function uses the same algorithm as the `path.closestPointLength()` function. It finds a visible segment whose identified closest point lies at the lowest distance from `point`.

The `opt` argument is optional. Two properties may be specified, `opt.precision` and `opt.segmentSubdivisions`, which determine maximum error allowed in segment `closestPoint` calculations for curved segments (default precision is 3; this corresponds to maximum observed error of 0.1%). The `opt.segmentSubdivisions` property is an array of individual segments' subdivision arrays. The `path.getSegmentSubdivisions()` function may be used to obtain the `segmentSubdivisions` array. The `opt.precision` property is still necessary, however; it determines the precision of the point search algorithm in curved segments.