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diff --git a/kig/misc/goniometry.cpp b/kig/misc/goniometry.cpp
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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 <tqstringlist.h>
+
+#include <kdebug.h>
+#include <tdelocale.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;
+}
+
+TQStringList Goniometry::systemList()
+{
+  TQStringList 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;
+}