Return an array of polylines that approximates the path at given precision. If there are no segments,
null is returned.
Every Moveto segment starts a new subpath within the path. Every subpath has a separate entry in the returned array. If there is only one subpath, an array with one element is returned.
The polyline points are found as endpoints of Lineto and Closepath segments and as endpoints of curve subdivisions whose flattened length is up to the specified precision level away from actual curved length. Refer to
path.length() documentation for more information about precision and curve flattening.
opt argument is optional. Two properties may be specified,
opt.segmentSubdivisions, which determine maximum error allowed in the calculation (default precision is 3; this corresponds to maximum observed error of 0.1% in flattened curve length). The
opt.segmentSubdivisions property is an array of individual segments' subdivision arrays. The
path.getSegmentSubdivisions() function may be used to obtain the