question: public void insertRadians ( double [ ] latlons , int coordPairIndex , boolean replaceEndsOfInsertedAtJoin ) { int minPntsNeededForInsertion = 2 ; boolean atEnd = false ; boolean isClosed = isGeometryClosed ( ) ; int insertionPoint = coordPairIndex * 2 ; if ( insertionPoint >= rawllpts . length ) { if ( isClosed ) { insertionPoint = rawllpts . length - 2 ; } else { insertionPoint = rawllpts . length ; atEnd = true ; } } else if ( insertionPoint <= 0 ) { if ( isClosed ) { insertionPoint = 2 ; } else { insertionPoint = 0 ; atEnd = true ; } } int newCoordStart = 0 ; int newCoordLength = latlons . length ; if ( replaceEndsOfInsertedAtJoin ) { newCoordStart = 2 ; minPntsNeededForInsertion = 6 ; if ( atEnd ) { minPntsNeededForInsertion -= 2 ; newCoordLength -= 2 ; if ( insertionPoint == 0 ) { newCoordStart = 0 ; } } else { newCoordLength -= 4 ; } } if ( renderType == OMGraphic . RENDERTYPE_LATLON && latlons . length >= minPntsNeededForInsertion && latlons . length % 2 == 0 ) { double [ ] oldrawllpnts = rawllpts ; int oldCoordsRemaining = oldrawllpnts . length - insertionPoint ; rawllpts = new double [ oldrawllpnts . length + newCoordLength ] ; System . arraycopy ( oldrawllpnts , 0 , rawllpts , 0 , insertionPoint ) ; System . arraycopy ( latlons , newCoordStart , rawllpts , insertionPoint , newCoordLength ) ; System . arraycopy ( oldrawllpnts , insertionPoint , rawllpts , insertionPoint + newCoordLength , oldCoordsRemaining ) ; setNeedToRegenerate ( true ) ; } }
target:  Convenience function for adding some coordinates to the polygon, for lat/lon polygons. Might be tricky for closed polygons, you might want to consider the index and not make them the starting or end point to preserve closed property.