2 CLAW - a C++ Library Absolutely Wonderful
4 CLAW is a free library without any particular aim but being useful to
7 Copyright (C) 2005-2011 Julien Jorge
9 This library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2.1 of the License, or (at your option) any later version.
14 This library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public
20 License along with this library; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 contact: julien.jorge@gamned.org
25 * \file claw/tween/easing/impl/symmetric_easing.tpp
26 * \brief Implementation of the claw::tween::symmetric_easing class.
27 * \author Julien Jorge
30 /*----------------------------------------------------------------------------*/
32 * \brief Apply the easing at the beginning of the tweener.
33 * \param t The ratio of the date, in (0, 1), representing the total progression
36 template<double (*Function)(double)>
37 double claw::tween::symmetric_easing<Function>::ease_in( double t )
40 } // symmetric_easing::ease_in()
42 /*----------------------------------------------------------------------------*/
44 * \brief Apply the easing at the end of the tweener.
45 * \param t The ratio of the date, in (0, 1), representing the total progression
48 template<double (*Function)(double)>
49 double claw::tween::symmetric_easing<Function>::ease_out( double t )
51 return 1 - ease_in( 1 - t );
52 } // symmetric_easing::ease_out()
54 /*----------------------------------------------------------------------------*/
56 * \brief Apply the easing at the beginning and the end of the tweener.
57 * \param t The ratio of the date, in (0, 1), representing the total progression
60 template<double (*Function)(double)>
61 double claw::tween::symmetric_easing<Function>::ease_in_out( double t )
64 return ease_in( 2 * t ) / 2;
66 return 0.5 + ease_out( 2 * t - 1 ) / 2;
67 } // symmetric_easing::ease_in_out()