claw 1.9.0
 
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single_tweener.cpp
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@stuff-o-matic.com
23*/
30
31#include <algorithm>
32
37 : m_date(0)
38 , m_easing(easing_none::ease_in_out)
39{}
40
50 double duration,
51 update_function callback,
53 : m_init(init)
54 , m_end(end)
55 , m_date(0)
56 , m_duration(duration)
57 , m_callback(callback)
58 , m_easing(e)
59{}
60
69 double duration, easing_function e)
70 : m_init(val)
71 , m_end(end)
72 , m_date(0)
73 , m_duration(duration)
74 , m_easing(e)
75{
76 m_callback = [&val](double v) -> void
77 {
78 val = v;
79 };
80}
81
86{
87 return m_init;
88}
89
95{
96 m_init = v;
97}
98
103{
104 return m_end;
105}
106
112{
113 m_end = v;
114}
115
120{
121 return m_duration;
122}
123
129{
130 m_duration = v;
131}
132
138{
139 m_callback = f;
140}
141
150
155{
156 const double coeff = m_easing(m_date / m_duration);
157 return m_init + coeff * (m_end - m_init);
158}
159
163claw::tween::single_tweener* claw::tween::single_tweener::do_clone() const
164{
165 return new single_tweener(*this);
166}
167
171bool claw::tween::single_tweener::do_is_finished() const
172{
173 return m_date >= m_duration;
174}
175
180double claw::tween::single_tweener::do_update(double dt)
181{
182 const double t(std::min(m_duration - m_date, dt));
183 const double result = dt - t;
184 m_date += t;
185
186 const double val(get_value());
187
188 if(m_callback)
189 m_callback(val);
190
191 return result;
192}
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.
std::function< double(double)> easing_function
The type of the function used to compute the new value.
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.
std::function< void(double)> update_function
The type of the function called when the single_tweener is updated.
A single_tweener makes a value to evolve through time from a initial value to an end value according ...