[geos-devel] Is empty LinearRing closed?

[Mateusz Łoskot]

Hi,

As I see, LinearRing is always closed:

bool LinearRing::isClosed() const {
	return true;
}

GeometryFactory ::createLinearRing() call creates empty LinerRing.
So, should it be considered as closed by default?

IMO empty LinearRing should not be considered as closed. OGC Simple
Feature Spec. says about IsClosed for Curve type (base of LinearRing):

IsClosed( ):
(TRUE) if this Curve is closed (StartPoint ( ) = EndPoint ( )).


So, according to OGC SF Spec. LinearRing::isClosed() should be
implemented as follows;

bool LinearRing::isClosed() const {
	return (getStartPoint() == getEndPoint());
}

Am I correct?

Cheers
-- 
Mateusz Łoskot
http://mateusz.loskot.net