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+/**
+ This file is part of Kig, a KDE program for Interactive Geometry...
+ Copyright (C) 2004 Dominique Devriese <devriese@kde.org>
+ Copyright (C) 2004 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 "goniometry.h"
+
+#include <qstringlist.h>
+
+#include <kdebug.h>
+#include <klocale.h>
+
+#include <cmath>
+
+Goniometry::Goniometry()
+{
+ mvalue = 0.0;
+ msys = Rad;
+}
+
+Goniometry::Goniometry( double value, Goniometry::System system )
+{
+ mvalue = value;
+ msys = system;
+}
+
+Goniometry::~Goniometry()
+{
+}
+
+void Goniometry::setValue( double value )
+{
+ mvalue = value;
+}
+
+const double Goniometry::value() const
+{
+ return mvalue;
+}
+
+void Goniometry::setSystem( Goniometry::System system )
+{
+ msys = system;
+}
+
+void Goniometry::convertTo( Goniometry::System system )
+{
+ mvalue = convert( mvalue, msys, system );
+ msys = system;
+}
+
+const Goniometry::System Goniometry::system() const
+{
+ return msys;
+}
+
+double Goniometry::getValue( Goniometry::System system )
+{
+ return convert( mvalue, msys, system );
+}
+
+Goniometry& Goniometry::operator=( const Goniometry& g )
+{
+ mvalue = g.value();
+ msys = g.system();
+ return *this;
+}
+
+double Goniometry::convert( const double angle, const Goniometry::System from, const Goniometry::System to )
+{
+ switch( from )
+ {
+ case Deg:
+ {
+ if ( to == Rad )
+ return angle * M_PI / 180;
+ if ( to == Grad )
+ return angle * 10 / 9;
+ break;
+ }
+ case Rad:
+ {
+ if ( to == Deg )
+ return angle * 180 / M_PI;
+ if ( to == Grad )
+ return angle * 200 / M_PI;
+ break;
+ }
+ case Grad:
+ {
+ if ( to == Deg )
+ return angle * 9 / 10;
+ if ( to == Rad )
+ return angle * M_PI / 200;
+ break;
+ }
+ }
+ return angle;
+}
+
+QStringList Goniometry::systemList()
+{
+ QStringList sl;
+ sl << i18n( "Translators: Degrees", "Deg" );
+ sl << i18n( "Translators: Radians", "Rad" );
+ sl << i18n( "Translators: Gradians", "Grad" );
+ return sl;
+}
+
+Goniometry::System Goniometry::intToSystem( const int index )
+{
+ if( index == 0 )
+ return Deg;
+ else if( index == 1 )
+ return Rad;
+ else if( index == 2 )
+ return Grad;
+ kdDebug() << "No goniometric system with index " << index << endl;
+ return Rad;
+}