Jim Evins
146 lines
2.6 KiB
C++
146 lines
2.6 KiB
C++
/* Units.cpp
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*
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* Copyright (C) 2013 Jim Evins <evins@snaught.com>
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*
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* This file is part of gLabels-qt.
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*
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* gLabels-qt is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* gLabels-qt is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with gLabels-qt. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "Units.h"
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#include <QDebug>
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namespace
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{
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const double POINTS_PER_POINT = 1.0; /* internal units are points. */
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const double POINTS_PER_INCH = 72.0;
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const double POINTS_PER_MM = 2.83464566929;
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const double POINTS_PER_CM = (10.0*POINTS_PER_MM);
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const double POINTS_PER_PICA = (1.0/12.0);
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}
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namespace libglabels
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{
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Units *Units::fromId( const QString &id )
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{
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if ( id == "pt" )
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{
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return point();
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}
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else if ( id == "in" )
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{
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return inch();
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}
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else if ( id == "mm" )
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{
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return mm();
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}
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else if ( id == "cm" )
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{
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return cm();
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}
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else if ( id == "pc" )
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{
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return pica();
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}
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else if ( id == "" )
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{
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/* Missing or empty units id defaults to points. */
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return point();
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}
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else
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{
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qWarning() << "Unknown Units ID \"" << id << "\", defaults to \"pt\"";
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return point();
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}
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}
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Units *Units::point()
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{
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static Units *instance = NULL;
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if ( instance == NULL )
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{
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instance = new Units( "pt", tr("points"), POINTS_PER_POINT );
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}
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return instance;
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}
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Units *Units::inch()
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{
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static Units *instance = NULL;
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if ( instance == NULL )
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{
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instance = new Units( "in", tr("inches"), POINTS_PER_INCH );
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}
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return instance;
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}
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Units *Units::mm()
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{
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static Units *instance = NULL;
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if ( instance == NULL )
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{
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instance = new Units( "mm", tr("mm"), POINTS_PER_MM );
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}
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return instance;
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}
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Units *Units::cm()
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{
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static Units *instance = NULL;
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if ( instance == NULL )
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{
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instance = new Units( "cm", tr("cm"), POINTS_PER_CM );
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}
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return instance;
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}
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Units *Units::pica()
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{
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static Units *instance = NULL;
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if ( instance == NULL )
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{
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instance = new Units( "pc", tr("picas"), POINTS_PER_PICA );
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}
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return instance;
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}
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bool Units::isIdValid( QString id )
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{
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return ( (id == "pt") || (id == "in") || (id == "mm") || (id == "cm") || (id == "pc") || (id == "") );
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}
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}
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