synfig-studio/trunk/src/gtkmm/ducktransform_rotate.h

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file ducktransform_rotate.h
   3 **      \brief Template Header
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **
  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.
  14 **
  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.
  19 **      \endlegal
  20 */
  21 /* ========================================================================= */
  22
  23 /* === S T A R T =========================================================== */
  24
  25 #ifndef __SYNFIG_STUDIO_DUCK_TRANSFORM_ROTATE_H
  26 #define __SYNFIG_STUDIO_DUCK_TRANSFORM_ROTATE_H
  27
  28 /* === H E A D E R S ======================================================= */
  29
  30 #include "duckmatic.h"
  31 #include <synfig/angle.h>
  32
  33 /* === M A C R O S ========================================================= */
  34
  35 /* === T Y P E D E F S ===================================================== */
  36
  37 /* === C L A S S E S & S T R U C T S ======================================= */
  38
  39 namespace studio {
  40
  41 class Transform_Rotate : public synfig::Transform
  42 {
  43 private:
  44         synfig::Angle angle;
  45         synfig::Vector origin;
  46         synfig::Real sin_val;
  47         synfig::Real cos_val;
  48
  49 public:
  50         Transform_Rotate(const synfig::Angle& angle,const synfig::Vector& origin=synfig::Vector(0,0)):
  51                 angle(angle),
  52                 origin(origin),
  53                 sin_val(synfig::Angle::sin(angle).get()),
  54                 cos_val(synfig::Angle::cos(angle).get())
  55         {
  56         }
  57
  58         synfig::Vector perform(const synfig::Vector& x)const
  59         {
  60                 synfig::Point pos(x-origin);
  61                 return synfig::Point(cos_val*pos[0]-sin_val*pos[1],sin_val*pos[0]+cos_val*pos[1])+origin;
  62         }
  63         synfig::Vector unperform(const synfig::Vector& x)const
  64         {
  65                 synfig::Point pos(x-origin);
  66                 return synfig::Point(cos_val*pos[0]+sin_val*pos[1],-sin_val*pos[0]+cos_val*pos[1])+origin;
  67         }
  68 };
  69
  70 };
  71
  72 /* === E N D =============================================================== */
  73
  74 #endif