public static List<Polygon> createSimpleDirectionArrow( Geometry... geometries ) {
        List<Polygon> polygons = new ArrayList<>();
        for( Geometry geometry : geometries ) {
            for( int i = 0; i < geometry.getNumGeometries(); i++ ) {
                Geometry geometryN = geometry.getGeometryN(i);
                if (geometryN instanceof LineString) {
                    LineString line = (LineString) geometryN;
                    polygons.addAll(makeArrows(line));
                } else if (geometryN instanceof Polygon) {
                    Polygon polygonGeom = (Polygon) geometryN;
                    LineString exteriorRing = polygonGeom.getExteriorRing();
                    polygons.addAll(makeArrows(exteriorRing));
                    int numInteriorRing = polygonGeom.getNumInteriorRing();
                    for( int j = 0; j < numInteriorRing; j++ ) {
                        LineString interiorRingN = polygonGeom.getInteriorRingN(j);
                        polygons.addAll(makeArrows(interiorRingN));
                    }
                }
            }
        }
        return polygons;
    }
public static List < Polygon > createSimpleDirectionArrow ( Geometry ... geometries ) { List < Polygon > polygons = new ArrayList < > ( ) ; for ( Geometry geometry : geometries ) { for ( int i = 0 ; i < geometry . getNumGeometries ( ) ; i ++ ) { Geometry geometryN = geometry . getGeometryN ( i ) ; if ( geometryN instanceof LineString ) { LineString line = ( LineString ) geometryN ; polygons . addAll ( makeArrows ( line ) ) ; } else if ( geometryN instanceof Polygon ) { Polygon polygonGeom = ( Polygon ) geometryN ; LineString exteriorRing = polygonGeom . getExteriorRing ( ) ; polygons . addAll ( makeArrows ( exteriorRing ) ) ; int numInteriorRing = polygonGeom . getNumInteriorRing ( ) ; for ( int j = 0 ; j < numInteriorRing ; j ++ ) { LineString interiorRingN = polygonGeom . getInteriorRingN ( j ) ; polygons . addAll ( makeArrows ( interiorRingN ) ) ; } } } } return polygons ; }
Creates simple arrow polygons in the direction of the coordinates.

@param geometries the geometries (lines and polygons) for which to create the arrows.
@return the list of polygon arrows.