/src/ftk_interpolator_bounce.c
http://ftk.googlecode.com/ · C · 63 lines · 26 code · 8 blank · 29 comment · 6 complexity · 1f8ec1459af9e6d1ed76565fc6745cfe MD5 · raw file
- /*
- * File: ftk_interpolator_bounce.h
- * Author: Li XianJing <xianjimli@hotmail.com>
- * Brief: bounce interpolator for animation.
- *
- * Copyright (c) 2009 - 2011 Li XianJing <xianjimli@hotmail.com>
- *
- * Licensed under the Academic Free License version 2.1
- *
- * This program 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 program 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- /*
- * History:
- * ================================================================
- * 2011-03-20 Li XianJing <xianjimli@hotmail.com> created
- *
- */
- #include "ftk_interpolator.h"
- static float ftk_interpolator_bounce_calc(float percent)
- {
- return 8 * percent * percent;
- }
- static float ftk_interpolator_bounce_get(FtkInterpolator* thiz, float percent)
- {
- percent *= 1.1226f;
- if (percent < 0.3535f)
- return ftk_interpolator_bounce_calc(percent);
- else if (percent < 0.7408f)
- return ftk_interpolator_bounce_calc(percent - 0.54719f) + 0.7f;
- else if (percent < 0.9644f)
- return ftk_interpolator_bounce_calc(percent - 0.8526f) + 0.9f;
- else
- return ftk_interpolator_bounce_calc(percent - 1.0435f) + 0.95f;
- }
- const static FtkInterpolator s_interpolator_bounce =
- {
- ftk_interpolator_bounce_get,
- NULL
- };
- FtkInterpolator* ftk_interpolator_bounce_create(void)
- {
- return (FtkInterpolator*)&s_interpolator_bounce;
- }