lib/marble/TileLoaderHelper.cpp

0001 /*
0002     SPDX-FileCopyrightText: 2005-2007 Torsten Rahn <tackat@kde.org>
0003     SPDX-FileCopyrightText: 2007 Inge Wallin <ingwa@kde.org>
0004     SPDX-FileCopyrightText: 2008 Patrick Spendrin <ps_ml@gmx.de>
0005     SPDX-FileCopyrightText: 2008 Jens-Michael Hoffmann <jensmh@gmx.de>
0006
0007     SPDX-License-Identifier: LGPL-2.0-or-later
0008 */
0009
0010 #include "TileLoaderHelper.h"
0011
0012 #include <cmath>
0013
0014 #include "MarbleDebug.h"
0015
0016 #include "MarbleGlobal.h"
0017
0018 namespace Marble
0019 {
0020
0021 int TileLoaderHelper::levelToRow( int levelZeroRows, int level )
0022 {
0023     if ( level < 0 ) {
0024         mDebug() << QString( "TileLoaderHelper::levelToRow(): Invalid level: %1" )
0025             .arg( level );
0026         return 0;
0027     }
0028     return levelZeroRows << level;
0029 }
0030
0031 int TileLoaderHelper::levelToColumn( int levelZeroColumns, int level )
0032 {
0033     if ( level < 0 ) {
0034         mDebug() << QString( "TileLoaderHelper::levelToColumn(): Invalid level: %1" )
0035             .arg( level );
0036         return 0;
0037     }
0038     return levelZeroColumns << level;
0039 }
0040
0041 int TileLoaderHelper::rowToLevel( int levelZeroRows, int row )
0042 {
0043     if ( row < levelZeroRows ) {
0044         mDebug() << QString( "TileLoaderHelper::rowToLevel(): Invalid number of rows: %1" )
0045             .arg( row );
0046         return 0;
0047     }
0048     return (int)( std::log( (qreal)(row / levelZeroRows) ) / std::log( (qreal)2.0 ) );
0049 }
0050
0051 int TileLoaderHelper::columnToLevel( int levelZeroColumns, int column )
0052 {
0053     if ( column < levelZeroColumns ) {
0054         mDebug() << QString( "TileLoaderHelper::columnToLevel(): Invalid number of columns: %1" )
0055         .arg( column );
0056         return 0;
0057     }
0058     return (int)( std::log( (qreal)(column / levelZeroColumns) ) / std::log( (qreal)2.0 ) );
0059 }
0060
0061 }