TileId.cpp

// SPDX-License-Identifier: LGPL-2.1-or-later
//
// SPDX-FileCopyrightText: 2008, 2010 Jens-Michael Hoffmann <jensmh@gmx.de>
// SPDX-FileCopyrightText: 2012 Bernhard Beschow <bbeschow@cs.tu-berlin.de>
//
 
// Own
#include "TileId.h"
 
#include "GeoDataCoordinates.h"
 
#include <QDebug>
 
namespace Marble
{
 
TileId::TileId(QString const &mapThemeId, int zoomLevel, int tileX, int tileY)
    : m_mapThemeIdHash(qHash(mapThemeId))
    , m_zoomLevel(zoomLevel)
    , m_tileX(tileX)
    , m_tileY(tileY)
{
}
 
TileId::TileId(uint mapThemeIdHash, int zoomLevel, int tileX, int tileY)
    : m_mapThemeIdHash(mapThemeIdHash)
    , m_zoomLevel(zoomLevel)
    , m_tileX(tileX)
    , m_tileY(tileY)
{
}
 
TileId::TileId()
    : m_mapThemeIdHash(0)
    , m_zoomLevel(0)
    , m_tileX(0)
    , m_tileY(0)
{
}
 
TileId TileId::fromCoordinates(const GeoDataCoordinates &coords, int zoomLevel)
{
    if (zoomLevel < 0) {
        return {};
    }
    const int maxLat = 90 * 1000000;
    const int maxLon = 180 * 1000000;
    int lat = GeoDataCoordinates::normalizeLat(coords.latitude(GeoDataCoordinates::Degree), GeoDataCoordinates::Degree) * 1000000;
    int lon = GeoDataCoordinates::normalizeLon(coords.longitude(GeoDataCoordinates::Degree), GeoDataCoordinates::Degree) * 1000000;
    int x = 0;
    int y = 0;
    for (int i = 0; i < zoomLevel; ++i) {
        const int deltaLat = maxLat >> i;
        if (lat <= (maxLat - deltaLat)) {
            y += 1 << (zoomLevel - i - 1);
            lat += deltaLat;
        }
        const int deltaLon = maxLon >> i;
        if (lon >= (maxLon - deltaLon)) {
            x += 1 << (zoomLevel - i - 1);
        } else {
            lon += deltaLon;
        }
    }
    return {0, zoomLevel, x, y};
}
 
}
 
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const Marble::TileId &id)
{
    return dbg << QStringLiteral("Marble::TileId(%1, %2, %3, %4)").arg(id.mapThemeIdHash()).arg(id.zoomLevel()).arg(id.x()).arg(id.y());
}
#endif