source: synfigstudio/trunk/fuentes/src/gui/ducktransform_rotate.h

/* === S Y N F I G ========================================================= */
/*!     \file ducktransform_rotate.h
**      \brief Template Header
**
**      $Id$
**
**      \legal
**      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**
**      This package 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 package 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.
**      \endlegal
*/
/* ========================================================================= */

/* === S T A R T =========================================================== */

#ifndef __SYNFIG_STUDIO_DUCK_TRANSFORM_ROTATE_H
#define __SYNFIG_STUDIO_DUCK_TRANSFORM_ROTATE_H

/* === H E A D E R S ======================================================= */

#include "duckmatic.h"
#include <synfig/angle.h>

/* === M A C R O S ========================================================= */

/* === T Y P E D E F S ===================================================== */

/* === C L A S S E S & S T R U C T S ======================================= */

namespace studio {

class Transform_Rotate : public synfig::Transform
{
private:
        //synfig::Angle angle;
        synfig::Vector origin;
        synfig::Real sin_val;
        synfig::Real cos_val;

public:
        Transform_Rotate(const synfig::GUID& guid, const synfig::Angle& angle,const synfig::Vector& origin=synfig::Vector(0,0)):
                Transform(guid),
                //angle(angle),
                origin(origin),
                sin_val(synfig::Angle::sin(angle).get()),
                cos_val(synfig::Angle::cos(angle).get())
        {
        }

        synfig::Vector perform(const synfig::Vector& x)const
        {
                synfig::Point pos(x-origin);
                return synfig::Point(cos_val*pos[0]-sin_val*pos[1],sin_val*pos[0]+cos_val*pos[1])+origin;
        }
        synfig::Vector unperform(const synfig::Vector& x)const
        {
                synfig::Point pos(x-origin);
                return synfig::Point(cos_val*pos[0]+sin_val*pos[1],-sin_val*pos[0]+cos_val*pos[1])+origin;
        }

        synfig::String get_string()const
        {
                return "duck rotate";
        }
};

};

/* === E N D =============================================================== */

#endif