NAME

Geo::Geos::Index::MonotoneChain - Partition the segments of a linestring to allow for fast searching of intersections.

SYNOPSIS

    use Geo::Geos::Coordinate;
    use Geo::Geos::Index::MonotoneChain qw/getChains/;
    use Geo::Geos::Index::MonotoneChainOverlapAction;

    my $c1 = Geo::Geos::Coordinate->new(0,2);
    my $c2 = Geo::Geos::Coordinate->new(1,2);
    my $c3 = Geo::Geos::Coordinate->new(2,2);
    my $c4 = Geo::Geos::Coordinate->new(3,1);
    my $c5 = Geo::Geos::Coordinate->new(4,1);
    my $c6 = Geo::Geos::Coordinate->new(5,1);
    my $c7 = Geo::Geos::Coordinate->new(6,0);
    my $c8 = Geo::Geos::Coordinate->new(7,0);

    my $list = [$c1, $c2, $c3, $c4, $c5, $c6, $c7, $c8];
    my $mc = Geo::Geos::Index::MonotoneChain->new($list, 0, 7);  # => isa 'Geo::Geos::Index::MonotoneChain'

    $mc->getStartIndex;     # => 0
    $mc->getEndIndex;       # => 7

    $mc->setId(1234);
    $mc->getId;             # => 1234

    my $c = $mc->getCoordinates->[0];   # => Geo::Geos::Coordinate->new(0,2)
    my $ls = $mc->getLineSegment(0);    # => isa 'Geo::Geos::LineSegment'
    my $e = $mc->getEnvelope;           # => isa 'Geo::Geos::Envelope'

    my $mc2 = Geo::Geos::Index::MonotoneChain->new([$c5, $c6], 0, 1);
    my $mcoa = Geo::Geos::Index::MonotoneChainOverlapAction->new;
    $mc->computeOverlaps($mc2, $mcoa);

    my $mc3 = getChains($list)->[0];    # => isa 'Geo::Geos::Index::MonotoneChain'

SEE ALSO (C++ classes docs)

GEOS C++ Library

geos::index::chain::MonotoneChain

geos::index::chain::MonotoneChainBuilder

SEE ALSO

Geo::Geos

Geo::Geos::Envelope

Geo::Geos::LineSegment

Geo::Geos::Index::MonotoneChainOverlapAction

AUTHOR

Ivan Baidakou <i.baydakov@crazypanda.ru>, Crazy Panda, CP Decision LTD

LICENSE

You may distribute this code under the same terms as Perl itself.