/src/ftk_interpolator_decelerate.c

 1/*
 2 * File: ftk_interpolator_decelerate.h    
 3 * Author:  Li XianJing <xianjimli@hotmail.com>
 4 * Brief:   decelerate interpolator for animation.
 5 *
 6 * Copyright (c) 2009 - 2011  Li XianJing <xianjimli@hotmail.com>
 7 *
 8 * Licensed under the Academic Free License version 2.1
 9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program 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
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
23 */
24
25/*
26 * History:
27 * ================================================================
28 * 2011-03-20 Li XianJing <xianjimli@hotmail.com> created
29 *
30 */
31
32#include "ftk_interpolator.h"
33
34static float ftk_interpolator_decelerate_get(FtkInterpolator* thiz, float percent)
35{
36	return (float)(1.0f - (1.0f - percent) * (1.0f - percent));
37}
38
39const static FtkInterpolator s_interpolator_decelerate = 
40{
41	ftk_interpolator_decelerate_get,
42	NULL
43};
44
45FtkInterpolator* ftk_interpolator_decelerate_create(void)
46{
47	return (FtkInterpolator*)&s_interpolator_decelerate;
48}
49