[Geographiclib-announce] BUG (+ fix) in Java implementation of PolygonArea::TestEdge

[Charles K. <cha...@sr...>]

There's a BUG in the PolygonArea::TestEdge routine in the Java
implementation of GeographicLib.  The following patch fixes this:

     diff --git 
a/java/src/main/java/net/sf/geographiclib/PolygonArea.java 
b/java/src/main/java/net/sf/geographiclib/PolygonArea.java
     index 1e4ed1a1..b7379bcc 100644
     --- a/java/src/main/java/net/sf/geographiclib/PolygonArea.java
     +++ b/java/src/main/java/net/sf/geographiclib/PolygonArea.java
     @@ -338,10 +338,10 @@ public class PolygonArea {
              _earth.Direct(_lat1, _lon1, azi, false, s, _mask);
            tempsum += g.S12;
            crossings += transitdirect(_lon1, g.lon2);
     +      crossings += transit(g.lon2, _lon0);
            g = _earth.Inverse(g.lat2, g.lon2, _lat0, _lon0, _mask);
            perimeter += g.s12;
            tempsum += g.S12;
     -      crossings += transit(g.lon2, _lon0);
          }

          if ((crossings & 1) != 0)

This will be included in the next release (version 1.50).