Esempi in C++ (Cpp) per Polygon_with_holes_2

Esempio n. 1

File: Intersection2D.cpp Progetto: HEShuang/SFCGAL

// local function : get the number of intersection points between rings of a polygon
int numIntersectionPoints( const CGAL::Polygon_with_holes_2<Kernel>& poly )
{
    int numIntersectionPoints = 0;
    CGAL::Polygon_with_holes_2<Kernel>::Hole_const_iterator hit = poly.holes_begin();

    for ( int i = 0; i == 0 || hit != poly.holes_end(); ++i ) {
        GeometrySet<2> ringI;

        if ( i == 0 ) {
            ringI.addSegments( poly.outer_boundary().edges_begin(), poly.outer_boundary().edges_end() );
        }
        else {
            ringI.addSegments( hit->edges_begin(), hit->edges_end() );
            hit++;
        }

        for ( CGAL::Polygon_with_holes_2<Kernel>::Hole_const_iterator hjt = hit;
                hjt != poly.holes_end();
                ++hjt ) {
            GeometrySet<2> ringJ, inter;
            ringJ.addSegments( hjt->edges_begin(), hjt->edges_end() );

            algorithm::intersection( ringI, ringJ, inter );
            numIntersectionPoints += inter.points().size();
        }
    }

    return numIntersectionPoints;
}

Esempio n. 2

File: orientation.cpp Progetto: Ezio47/SFCGAL

void makeValidOrientation( CGAL::Polygon_with_holes_2< Kernel >& polygon )
{
    typedef CGAL::Polygon_with_holes_2< Kernel > Polygon_with_holes_2 ;

    if ( polygon.outer_boundary().orientation() != CGAL::COUNTERCLOCKWISE ) {
        polygon.outer_boundary().reverse_orientation() ;
    }

    for ( Polygon_with_holes_2::Hole_iterator it = polygon.holes_begin(); it != polygon.holes_end(); ++it ) {
        if ( it->orientation() != CGAL::CLOCKWISE ) {
            it->reverse_orientation() ;
        }
    }
}

Esempio n. 3

File: Polygon.cpp Progetto: hjanetzek/SFCGAL

Polygon::Polygon( const CGAL::Polygon_with_holes_2< Kernel >& poly )
{
    _rings.push_back( new LineString() );
    CGAL::Polygon_2<Kernel> outer = poly.outer_boundary();
    CGAL::Polygon_2<Kernel>::Edge_const_iterator ei;

    for ( ei = outer.edges_begin(); ei != outer.edges_end(); ++ei ) {
        _rings.back().addPoint( ei->source() );
    }

    _rings.back().addPoint( _rings.back().startPoint() );

    for ( CGAL::Polygon_with_holes_2<Kernel>::Hole_const_iterator hit = poly.holes_begin(); hit != poly.holes_end(); ++hit ) {
        _rings.push_back( new LineString() );
        CGAL::Polygon_2<Kernel>::Edge_const_iterator ei;

        for ( ei = hit->edges_begin(); ei != hit->edges_end(); ++ei ) {
            _rings.back().addPoint( ei->source() );
        }

        _rings.back().addPoint( _rings.back().startPoint() );
    }
}