GeoDataLinearRing.cpp

// SPDX-License-Identifier: LGPL-2.1-or-later
//
// SPDX-FileCopyrightText: 2008 Torsten Rahn <rahn@kde.org>
//
 
 
#include "GeoDataLinearRing.h"
#include "GeoDataLinearRing_p.h"
 
#include "GeoDataTypes.h"
#include "MarbleDebug.h"
 
namespace Marble
{
 
GeoDataLinearRing::GeoDataLinearRing( TessellationFlags f )
    : GeoDataLineString( new GeoDataLinearRingPrivate( f ) )
{
}
 
GeoDataLinearRing::GeoDataLinearRing( const GeoDataGeometry & other )
  : GeoDataLineString( other )
{
}
 
GeoDataLinearRing::~GeoDataLinearRing()
{
}
 
const char *GeoDataLinearRing::nodeType() const
{
    return GeoDataTypes::GeoDataLinearRingType;
}
 
EnumGeometryId GeoDataLinearRing::geometryId() const
{
    return GeoDataLinearRingId;
}
 
GeoDataGeometry *GeoDataLinearRing::copy() const
{
    return new GeoDataLinearRing(*this);
}
 
bool GeoDataLinearRing::operator==( const GeoDataLinearRing &other ) const
{
    return isClosed() == other.isClosed() &&
           GeoDataLineString::operator==( other );
}
 
bool GeoDataLinearRing::operator!=( const GeoDataLinearRing &other ) const
{
    return !this->operator==(other);
}
 
bool GeoDataLinearRing::isClosed() const
{
    return true;
}
 
qreal GeoDataLinearRing::length( qreal planetRadius, int offset ) const
{
    qreal  length = GeoDataLineString::length( planetRadius, offset );
 
    return length + planetRadius * last().sphericalDistanceTo(first());
}
 
bool GeoDataLinearRing::contains( const GeoDataCoordinates &coordinates ) const
{
    // Quick bounding box check
    if ( !latLonAltBox().contains( coordinates ) ) {
        return false;
    }
 
    int const points = size();
    bool inside = false; // also true for points = 0
    int j = points - 1;
 
    for ( int i=0; i<points; ++i ) {
        GeoDataCoordinates const & one = operator[]( i );
        GeoDataCoordinates const & two = operator[]( j );
 
        if ( ( one.longitude() < coordinates.longitude() && two.longitude() >= coordinates.longitude() ) ||
             ( two.longitude() < coordinates.longitude() && one.longitude() >= coordinates.longitude() ) ) {
            if ( one.latitude() + ( coordinates.longitude() - one.longitude()) / ( two.longitude() - one.longitude()) * ( two.latitude()-one.latitude() ) < coordinates.latitude() ) {
                inside = !inside;
            }
        }
 
        j = i;
    }
 
    return inside;
}
 
bool GeoDataLinearRing::isClockwise() const
{
    int const n = size();
    qreal area = 0;
    for ( int i = 1; i < n; ++i ){
        area += ( operator[]( i ).longitude() - operator[]( i - 1 ).longitude() ) * ( operator[]( i ).latitude() + operator[]( i - 1 ).latitude() );
    }
    area += ( operator[]( 0 ).longitude() - operator[]( n - 1 ).longitude() ) * ( operator[] ( 0 ).latitude() + operator[]( n - 1 ).latitude() );
 
    return area > 0;
}
 
}