KmlLineStringTagWriter.cpp

// SPDX-License-Identifier: LGPL-2.1-or-later
//
// SPDX-FileCopyrightText: 2010 Dennis Nienhüser <nienhueser@kde.org>
// SPDX-FileCopyrightText: 2014 Marek Hakala <hakala.marek@gmail.com>
//
 
#include "KmlLineStringTagWriter.h"
 
#include "GeoDataLineString.h"
#include "GeoDataTypes.h"
#include "GeoDataCoordinates.h"
#include "GeoWriter.h"
#include "KmlElementDictionary.h"
#include "KmlObjectTagWriter.h"
 
namespace Marble
{
 
static GeoTagWriterRegistrar s_writerLookAt(
    GeoTagWriter::QualifiedName( GeoDataTypes::GeoDataLineStringType,
                                 kml::kmlTag_nameSpaceOgc22 ),
    new KmlLineStringTagWriter );
 
bool KmlLineStringTagWriter::write( const GeoNode *node, GeoWriter& writer ) const
{
    const GeoDataLineString *lineString = static_cast<const GeoDataLineString*>( node );
 
    if ( lineString->size() > 1 )
    {
        writer.writeStartElement( kml::kmlTag_LineString );
        KmlObjectTagWriter::writeIdentifiers( writer, lineString );
        writer.writeOptionalElement( kml::kmlTag_extrude, QString::number( lineString->extrude() ), "0" );
        writer.writeOptionalElement( kml::kmlTag_tessellate, QString::number( lineString->tessellate() ), "0" );
        writer.writeStartElement( "coordinates" );
 
        // Write altitude for *all* elements, if *any* element
        // has altitude information (!= 0.0)
        bool hasAltitude = false;
        for ( int i = 0; i < lineString->size(); ++i ) {
            if ( lineString->at( i ).altitude() ) {
                hasAltitude = true;
                break;
            }
        }
 
        for ( int i = 0; i < lineString->size(); ++i ) {
            GeoDataCoordinates coordinates = lineString->at( i );
            if ( i > 0 )
            {
                writer.writeCharacters( " " );
            }
 
            qreal lon = coordinates.longitude( GeoDataCoordinates::Degree );
            writer.writeCharacters( QString::number( lon, 'f', 10 ) );
            writer.writeCharacters( "," );
            qreal lat = coordinates.latitude( GeoDataCoordinates::Degree );
            writer.writeCharacters( QString::number( lat, 'f', 10 ) );
 
            if ( hasAltitude ) {
                qreal alt = coordinates.altitude();
                writer.writeCharacters( "," );
                writer.writeCharacters( QString::number( alt, 'f', 2 ) );
            }
        }
 
        writer.writeEndElement();
        writer.writeEndElement();
 
        return true;
    }
 
    return false;
}
 
}