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/***************************************************************************
* Copyright (C) 2005 by Pino Toscano *
* toscano.pino@tiscali.it *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include "tempunit.h"
double TempUnit::convert( double value, TempUnit::Unit from, TempUnit::Unit to )
{
/**
* These are the four formula needed to convert from
* Kelvin the the other units:
Kelvin Celsius °C = K - 273,15
Kelvin Fahrenheit °F = K × 1,8 - 459,67
Kelvin Rankine °Ra = K × 1,8
Kelvin Reaumur °R = ( K - 273,15 ) × 0,8
*/
if ( from != Kelvin )
value = convertToKelvin( value, from );
//now 'value' is in Kelvin
switch( to )
{
case Celsius:
return value - 273.16;
case Fahrenheit:
return value * 1.8 - 459.67;
case Rankine:
return value * 1.8;
case Reaumur:
return ( value - 273.15 )* 0.8;
case Kelvin:
return value;
}
return value;
}
double TempUnit::convertToKelvin( const double value, TempUnit::Unit from )
{
switch( from )
{
case Kelvin:
return value;
case Celsius:
return value + 273.16;
case Fahrenheit:
return ( value + 459.67 )/1.8;
case Rankine:
return value / 1.8;
case Reaumur:
return ( value * 1.25 ) + 273.15;
}
return value;
}
double TempUnit::convert( const double value, int from, int to )
{
return convert( value, (TempUnit::Unit)from, (TempUnit::Unit)to );
}
QStringList TempUnit::unitListSymbols()
{
QStringList list;
list << "K";
list << QString::fromUtf8("°C");
list << QString::fromUtf8("°F");
list << QString::fromUtf8("°Ra");
list << QString::fromUtf8("°R");
return list;
}
QString TempUnit::unitListSymbol( int i )
{
QStringList l = unitListSymbols();
if ( ( i < 0 ) || ( i >= (int)l.count() ) )
return l[0];
return l[i];
}
QPair<double, double> TempUnit::rangeForUnit( TempUnit::Unit u )
{
switch( u )
{
case Kelvin:
{
return QPair<double, double>( 0.0, 5000.0 );
break;
}
case Celsius:
{
return QPair<double, double>( -273.16, 4726.84 );
break;
}
case Fahrenheit:
{
return QPair<double, double>( -459.67, 8540.33 );
break;
}
case Rankine:
{
return QPair<double, double>( 0.0, 9000.0 );
break;
}
case Reaumur:
{
return QPair<double, double>( -218.52, 3781.48 );
break;
}
}
return QPair<double, double>( 0.0, 5000.0 );
}
QPair<double, double> TempUnit::rangeForUnit( int u )
{
return rangeForUnit( (TempUnit::Unit)u );
}
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