Claw
1.7.0
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00001 /* 00002 CLAW - a C++ Library Absolutely Wonderful 00003 00004 CLAW is a free library without any particular aim but being useful to 00005 anyone. 00006 00007 Copyright (C) 2005-2011 Julien Jorge 00008 00009 This library is free software; you can redistribute it and/or 00010 modify it under the terms of the GNU Lesser General Public 00011 License as published by the Free Software Foundation; either 00012 version 2.1 of the License, or (at your option) any later version. 00013 00014 This library is distributed in the hope that it will be useful, 00015 but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 Lesser General Public License for more details. 00018 00019 You should have received a copy of the GNU Lesser General Public 00020 License along with this library; if not, write to the Free Software 00021 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00022 contact: julien.jorge@gamned.org 00023 */ 00029 #include <claw/tween/single_tweener.hpp> 00030 00031 #include <algorithm> 00032 #include <boost/bind.hpp> 00033 00034 /*----------------------------------------------------------------------------*/ 00038 claw::tween::single_tweener::single_tweener() 00039 : m_date(0), m_easing( easing_none::ease_in_out ) 00040 { 00041 00042 } // single_tweener::single_tweener() 00043 00044 /*----------------------------------------------------------------------------*/ 00053 claw::tween::single_tweener::single_tweener 00054 ( double init, double end, double duration, update_function callback, 00055 easing_function e ) 00056 : m_init(init), m_end(end), m_date(0), m_duration(duration), 00057 m_callback(callback), m_easing(e) 00058 { 00059 00060 } // single_tweener::single_tweener() 00061 00062 /*----------------------------------------------------------------------------*/ 00070 claw::tween::single_tweener::single_tweener 00071 ( double& val, double end, double duration, easing_function e ) 00072 : m_init(val), m_end(end), m_date(0), m_duration(duration), m_easing(e) 00073 { 00074 m_callback = boost::bind( &std::swap<double>, boost::ref(val), _1 ); 00075 } // single_tweener::single_tweener() 00076 00077 /*----------------------------------------------------------------------------*/ 00082 void claw::tween::single_tweener::set_init( double v ) 00083 { 00084 m_init = v; 00085 } // single_tweener::set_init() 00086 00087 /*----------------------------------------------------------------------------*/ 00092 void claw::tween::single_tweener::set_end( double v ) 00093 { 00094 m_end = v; 00095 } // single_tweener::set_end() 00096 00097 /*----------------------------------------------------------------------------*/ 00102 void claw::tween::single_tweener::set_duration( double v ) 00103 { 00104 m_duration = v; 00105 } // single_tweener::set_duration() 00106 00107 /*----------------------------------------------------------------------------*/ 00112 void claw::tween::single_tweener::set_callback( update_function f ) 00113 { 00114 m_callback = f; 00115 } // single_tweener::set_callback() 00116 00117 /*----------------------------------------------------------------------------*/ 00122 void claw::tween::single_tweener::set_easing( easing_function f ) 00123 { 00124 m_easing = f; 00125 } // single_tweener::set_easing() 00126 00127 /*----------------------------------------------------------------------------*/ 00131 claw::tween::single_tweener* claw::tween::single_tweener::do_clone() const 00132 { 00133 return new single_tweener(*this); 00134 } // single_tweener::do_clone() 00135 00136 /*----------------------------------------------------------------------------*/ 00140 bool claw::tween::single_tweener::do_is_finished() const 00141 { 00142 return m_date >= m_duration; 00143 } // single_tweener::do_is_finished() 00144 00145 /*----------------------------------------------------------------------------*/ 00150 double claw::tween::single_tweener::do_update( double dt ) 00151 { 00152 const double t( std::min(m_duration - m_date, dt) ); 00153 const double result = dt - t; 00154 m_date += t; 00155 00156 const double coeff = m_easing( m_date / m_duration ); 00157 const double val = m_init + coeff * (m_end - m_init); 00158 00159 m_callback(val); 00160 00161 return result; 00162 } // single_tweener::do_update()