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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.
+
+#ifndef KIG_MISC_GONIOMETRY_H
+#define KIG_MISC_GONIOMETRY_H
+
+#include <qstringlist.h>
+
+/**
+ * Manage an angle and convert it from/to other goniometric systems.
+ */
+class Goniometry
+{
+public:
+  enum System { Deg, Rad, Grad };
+  Goniometry();
+  Goniometry( double value, Goniometry::System system );
+  ~Goniometry();
+  void setValue( double value );
+  const double value() const;
+  /**
+   * Set the system of the current angle to \p system, but it doesn't
+   * convert the value to the new system.
+   *
+   * \see convertTo()
+   */
+  void setSystem( Goniometry::System system );
+  /**
+   * Set the system of the current angle to \p system and convert the
+   * value to the new system using \ref convert().
+   *
+   * \see setSystem()
+   */
+  void convertTo( Goniometry::System system );
+  const Goniometry::System system() const;
+  double getValue( Goniometry::System system );
+  /**
+   * The most useful method of this class: convert the specified
+   * \p angle from the system \p from to the system \p to.
+   */
+  static double convert( const double angle, const Goniometry::System from, const Goniometry::System to );
+  /**
+   * Get a list of the supported goniometric systems.
+   */
+  static QStringList systemList();
+  static Goniometry::System intToSystem( const int index );
+
+  Goniometry& operator= ( const Goniometry& g );
+
+private:
+  double mvalue;
+  typedef Goniometry::System goniosys;
+  goniosys msys;
+};
+
+#endif