VRS - The Virtual Rendering System

version 3.3

lookat.h

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/******************************************************************************
 * VRS - The Virtual Rendering System
 * Copyright (C) 2003 Computer Graphics Systems Group at the 
 * Hasso-Plattner-Institute (HPI), Potsdam, Germany.
 *
 * This  library  is  free  software; you can redistribute it and/or  modify it
 * under the terms of the GNU Lesser General Public  License  as  published  by
 * the  Free  Software  Foundation;  either  version 2.1 of the License, or (at
 * your option) any later version. This library  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 Lesser General Public License for more details. You should have received
 * a copy of the GNU Lesser+ General Public License along with this library; if
 * not, write to the FreeSoftware Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA, 02111-1307, USA.
 ******************************************************************************/

// $Id: lookat.h 4633 2005-01-03 01:43:11Z klimetschek $
// $Date: 2005-01-03 02:43:11 +0100 (Mon, 03 Jan 2005) $
// $Revision: 4633 $
// $State$
// $Author: klimetschek $
//
// $Log$
// Revision 1.21  2005/01/03 01:43:08  klimetschek
// - modified win32 project layout, splitted vrs.vcproj into vrs_container, vrs_core, vrs_sg, vrs_image, vrs_opengl and vrs_io
// - removed vrs.vcproj
// minor things:
// - added all glutexamples to vrs4glut.sln
// - fixed some problems in glutexamples
// - removed all project references from all VS projects (using solution wide project dependencies instead)
//
// Revision 1.20  2004/11/05 13:58:09  basch
// Class comment changed (Doxygen style)
//
// Revision 1.19  2004/04/22 09:12:18  baumann
// eye distance removed
//
// Revision 1.18  2004/03/12 16:28:38  baumann
// macros VRS_NAMESPACE_BEGIN/_END expanded and removed
//
// Revision 1.17  2004/01/19 11:43:57  baumann
// serialization mechanism improved
//
// Revision 1.16  2003/11/07 14:19:24  kirsch
// removed leading underscore from include guards
//
// Revision 1.15  2003/06/29 11:53:40  baumann
// - added: void VRS::LookAt::setFromToUp(from, to, up)
//
// Revision 1.14  2003/06/29 11:13:59  baumann
// - added: static bool VRS::LookAt::isValid(from, to, up)
// - renamed (non-static) method VRS::LookAt::valid() to VRS::LookAt::isValid()
//
// Revision 1.13  2003/04/16 11:22:39  buchholz
// now (0,1,0) is default up vector again, another up vector is computed only if the specified one is invalid.
//
// Revision 1.12  2003/04/10 12:14:04  buchholz
// degeneracy check and additional constructor included. The alternate constructor computes an up vector that is always nonzero and perpendicular to the direction vector.
//
// Revision 1.11  2002/10/29 10:32:52  baumann
// macros VRS_CLASSNAME_* and VRS_IMPL_TYPEINFO_* removed
//
// Revision 1.10  2002/05/06 13:08:02  kirsch
// cleanup: used mutable instead of const cast, removed declared but
// undefined methods, in serialize only set rebuild flag if reading
//
// Revision 1.9  2002/03/03 21:44:24  kosta
// VRS_TYPEINFO-macro rewritten
//
// Revision 1.8  2002/02/19 10:34:09  kosta
// undone all changes since 2002-02-15
//
// Revision 1.5  2002/02/05 07:48:25  kosta
// new persistency macros:
//     VRS_SERIALIZABLE(CLASS_NAME);
//     VRS_SERIALIZABLE_ABSTRACT_CLASS(CLASS_NAME);
//     VRS_SERIALIZABLE_NO_SO_CLASS(CLASS_NAME)
//
// Revision 1.4  2002/02/04 13:07:19  kosta
// VRS_SERIALIZABLE macros completely rewritten
//
// Revision 1.3  2002/01/15 16:25:54  kosta
// macros rewritten for a better namespace support
//
// Revision 1.2  2001/11/13 16:36:30  kirsch
// changed line feed to unix style (removed control-M)
//
// Revision 1.1.1.1  2001/06/08 08:09:20  kirsch
// imported alpha-version by olli 
//


#ifndef VRS_LOOKAT_H
#define VRS_LOOKAT_H

#include <vrs/transform.h>

namespace VRS {

class VRS_CORE_API LookAt : public Transform {

public:
    LookAt(const Vector& from = Vector(0.0, 0.0, 1.0),
           const Vector& to = Vector::origin,
           const Vector& up = Vector(0.0, 1.0, 0.0)
    );
    void setFromToUp(const Vector& from, const Vector& to, const Vector& up);

    void setFrom(const Vector& from);
    Vector getFrom() const;

    void setTo(const Vector& to);
    Vector getTo() const;

    void setUp(const Vector& up);
    Vector getUp() const;

    bool isValid() const;
    static bool isValid(const Vector& from, const Vector& to, const Vector& up);
    virtual const Matrix& matrix(Engine* engine = NULL) const;

    VRS_TYPEINFO(LookAt, Transform);
    VRS_SERIALIZABLE(LookAt);

private:
    void rebuild() const;

    Vector from_;
    Vector to_;
    Vector up_;

    mutable Matrix orientation_;
    mutable bool rebuild_;
    mutable bool valid_;
};

inline Vector LookAt::getFrom() const { return from_; }
inline Vector LookAt::getTo() const { return to_; }
inline Vector LookAt::getUp() const { return up_; }

} // namespace VRS

#endif // VRS_LOOKAT_H

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