question: public static final List < Geo > segmentNearPoly ( Geo s1 , Geo s2 , GeoArray r , double near ) { int rlen = r . getSize ( ) ; Geo pl0 = r . get ( rlen - 1 , new Geo ( ) ) ; Geo pl1 = new Geo ( ) ; List < Geo > list = null ; Geo check = new Geo ( ) ; for ( int j = 0 ; j < rlen ; j ++ ) { r . get ( j , pl1 ) ; Geo ret = segmentsIntersectOrNear ( s1 , s2 , pl0 , pl1 , near , check ) ; if ( ret != null ) { if ( list == null ) { list = new LinkedList < Geo > ( ) ; } list . add ( ret ) ; check = new Geo ( ) ; } pl0 . initialize ( pl1 ) ; } return list ; }
target:  Where is a segment, represented by endpoints 's1' and 's2', withing a range 'near' of region 'r'?