package Slic3r::Line;
use strict;
use warnings;

# a line is a two-points line
use parent 'Slic3r::Polyline';

use Slic3r::Geometry qw(A B X Y);

sub coincides_with {
    my $self = shift;
    my ($line) = @_;
    
    return ($self->a->coincides_with($line->a) && $self->b->coincides_with($line->b))
        || ($self->a->coincides_with($line->b) && $self->b->coincides_with($line->a));
}

sub vector {
    my $self = shift;
    return (ref $self)->new([0,0], [map $self->[B][$_] - $self->[A][$_], X,Y]);
}

sub atan {
    my $self = shift;
    return Slic3r::Geometry::line_atan($self);
}

sub direction {
    my $self = shift;
    return Slic3r::Geometry::line_direction($self);
}

sub intersection {
    my $self = shift;
    my ($line, $require_crossing) = @_;
    return Slic3r::Geometry::line_intersection($self, $line, $require_crossing);
}

sub point_on_left {
    my $self = shift;
    my ($point) = @_;
    return Slic3r::Geometry::point_is_on_left_of_segment($point, $self);
}

sub midpoint {
    my $self = shift;
    return Slic3r::Point->new(
        ($self->[A][X] + $self->[B][X]) / 2,
        ($self->[A][Y] + $self->[B][Y]) / 2,
    );
}

sub grow {
    my $self = shift;
    return Slic3r::Polyline->new(@$self[0,1,0])->grow(@_);
}

1;