Claw 1.7.3
single_tweener.cpp
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1/*
2 CLAW - a C++ Library Absolutely Wonderful
3
4 CLAW is a free library without any particular aim but being useful to
5 anyone.
6
7 Copyright (C) 2005-2011 Julien Jorge
8
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.
13
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.
18
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
23*/
30
31#include <algorithm>
32#include <boost/bind.hpp>
33
50static void local_swap( double& a, double& b )
51{
52 const double t(a);
53 a = b;
54 b = t;
55} // local_swap()
56
57#ifndef CLAW_TWEENER_DEFINE_BOOST_THROW_EXCEPTION
58
59#ifndef WORKAROUND_BOOST_THROW_EXCEPTION
60#define WORKAROUND_BOOST_THROW_EXCEPTION
61
62#include "boost/throw_exception.hpp"
63
67namespace boost {
68
76 void throw_exception( std::exception const& exc ) {
77 // nothing
78 } // throw_exception()
79
80} // namespace boost
81
82#endif // WORKAROUND_BOOST_THROW_EXCEPTION
83#endif // ifdef CLAW_TWEENER_DEFINE_BOOST_THROW_EXCEPTION
84
85/*----------------------------------------------------------------------------*/
90 : m_date(0), m_easing( easing_none::ease_in_out )
91{
92
93} // single_tweener::single_tweener()
94
95/*----------------------------------------------------------------------------*/
105( double init, double end, double duration, update_function callback,
107 : m_init(init), m_end(end), m_date(0), m_duration(duration),
108 m_callback(callback), m_easing(e)
109{
110
111} // single_tweener::single_tweener()
112
113/*----------------------------------------------------------------------------*/
122( double& val, double end, double duration, easing_function e )
123 : m_init(val), m_end(end), m_date(0), m_duration(duration), m_easing(e)
124{
125 //m_callback = boost::bind( &local_swap, boost::ref(val), _1 );
126} // single_tweener::single_tweener()
127
128/*----------------------------------------------------------------------------*/
133{
134 return m_init;
135} // single_tweener::get_init()
136
137/*----------------------------------------------------------------------------*/
143{
144 m_init = v;
145} // single_tweener::set_init()
146
147/*----------------------------------------------------------------------------*/
152{
153 return m_end;
154} // single_tweener::get_end()
155
156/*----------------------------------------------------------------------------*/
162{
163 m_end = v;
164} // single_tweener::set_end()
165
166/*----------------------------------------------------------------------------*/
171{
172 return m_duration;
173} // single_tweener::get_duration()
174
175/*----------------------------------------------------------------------------*/
181{
182 m_duration = v;
183} // single_tweener::set_duration()
184
185/*----------------------------------------------------------------------------*/
191{
192 m_callback = f;
193} // single_tweener::set_callback()
194
195/*----------------------------------------------------------------------------*/
201{
202 m_easing = f;
203} // single_tweener::set_easing()
204
205/*----------------------------------------------------------------------------*/
210{
211 const double coeff = m_easing( m_date / m_duration );
212 return m_init + coeff * (m_end - m_init);
213} // single_tweener::get_value()
214
215/*----------------------------------------------------------------------------*/
219claw::tween::single_tweener* claw::tween::single_tweener::do_clone() const
220{
221 return new single_tweener(*this);
222} // single_tweener::do_clone()
223
224/*----------------------------------------------------------------------------*/
228bool claw::tween::single_tweener::do_is_finished() const
229{
230 return m_date >= m_duration;
231} // single_tweener::do_is_finished()
232
233/*----------------------------------------------------------------------------*/
238double claw::tween::single_tweener::do_update( double dt )
239{
240 const double t( std::min(m_duration - m_date, dt) );
241 const double result = dt - t;
242 m_date += t;
243
244 const double val( get_value() );
245
246 m_callback(val);
247
248 return result;
249} // single_tweener::do_update()
Easing functions for the tweener. Those functions do nothing.
A single_tweener makes a value to evolve through time from a initial value to an end value according ...
void set_duration(double v)
Sets the total duration.
double get_end() const
Gets the final value.
void set_end(double v)
Sets the final value.
single_tweener()
Default constructor.
void set_easing(easing_function f)
The function used to compute the new value.
boost::function< double(double)> easing_function
The type of the function used to compute the new value.
boost::function< void(double)> update_function
The type of the function called when the single_tweener is updated.
double get_init() const
Gets the initial value.
void set_init(double v)
Sets the initial value.
double get_duration() const
Gets the total duration.
void set_callback(update_function f)
The function called when the single_tweener is updated.
double get_value() const
Gets the current value of the tweener.
Redefinition of some boost elements, required on some compilers.
void throw_exception(std::exception const &exc)
boost::throw_exception definition, Needed on XCode compiler. This implementation does nothing.
A single_tweener makes a value to evolve through time from a initial value to an end value according ...