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/*
CLAW - a C++ Library Absolutely Wonderful
CLAW is a free library without any particular aim but being useful to
anyone.
Copyright (C) 2005-2011 Julien Jorge
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
contact: julien.jorge@gamned.org
*/
/**
* \file claw/code/tween/easing/easing_bounce.cpp
* \brief Implementation of the claw::tween::easing_bounce_func function.
* \author Julien Jorge
*/
#include <claw/tween/easing/easing_bounce.hpp>
/**
* \brief The default function.
* \param t The ratio of the date, in (0, 1), representing the total
* progression of the tweener.
*/
double claw::tween::easing_bounce_func( double t )
{
const double v = 1 - t;
double c;
double d;
if ( v < (1 / 2.75) )
{
c = v;
d = 0;
}
else if ( v < (2 / 2.75) )
{
c = v - 1.5 / 2.75;
d = 0.75;
}
else if ( v < (2.5 / 2.75) )
{
c = v - 2.25 / 2.75;
d = 0.9375;
}
else
{
c = v - 2.625 / 2.75;
d = 0.984375;
}
return 1 - (7.5625 * c * c + d);
} // easing_bounce_func()
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