validate<T extends Point<num> > static method
Validate rings
to have at least one exterior and all must be rings.
Implementation
static BoundedSeries<LineString<T>> validate<T extends Point>(
Iterable<LineString<T>> rings,
) {
if (rings.isEmpty) {
throw ArgumentError('Polygon must have exterior ring.');
}
for (final ring in rings) {
if (ring.type != LineStringType.ring) {
throw ArgumentError('Not a linear ring.');
}
}
return rings is BoundedSeries<LineString<T>>
? rings
: BoundedSeries.view(rings);
}