1 /* === S Y N F I G ========================================================= */
2 /*! \file ducktransform_rotate.h
3 ** \brief Template Header
8 ** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
10 ** This package is free software; you can redistribute it and/or
11 ** modify it under the terms of the GNU General Public License as
12 ** published by the Free Software Foundation; either version 2 of
13 ** the License, or (at your option) any later version.
15 ** This package is distributed in the hope that it will be useful,
16 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ** General Public License for more details.
21 /* ========================================================================= */
23 /* === S T A R T =========================================================== */
25 #ifndef __SYNFIG_STUDIO_DUCK_TRANSFORM_ROTATE_H
26 #define __SYNFIG_STUDIO_DUCK_TRANSFORM_ROTATE_H
28 /* === H E A D E R S ======================================================= */
30 #include "duckmatic.h"
31 #include <synfig/angle.h>
33 /* === M A C R O S ========================================================= */
35 /* === T Y P E D E F S ===================================================== */
37 /* === C L A S S E S & S T R U C T S ======================================= */
41 class Transform_Rotate : public synfig::Transform
45 synfig::Vector origin;
50 Transform_Rotate(const synfig::GUID& guid, const synfig::Angle& angle,const synfig::Vector& origin=synfig::Vector(0,0)):
54 sin_val(synfig::Angle::sin(angle).get()),
55 cos_val(synfig::Angle::cos(angle).get())
59 synfig::Vector perform(const synfig::Vector& x)const
61 synfig::Point pos(x-origin);
62 return synfig::Point(cos_val*pos[0]-sin_val*pos[1],sin_val*pos[0]+cos_val*pos[1])+origin;
64 synfig::Vector unperform(const synfig::Vector& x)const
66 synfig::Point pos(x-origin);
67 return synfig::Point(cos_val*pos[0]+sin_val*pos[1],-sin_val*pos[0]+cos_val*pos[1])+origin;
73 /* === E N D =============================================================== */