base_tweener.cpp
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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
*/
#include <claw/tween/base_tweener.hpp>
#include <claw/assert.hpp>
/*----------------------------------------------------------------------------*/
claw::tween::base_tweener::~base_tweener()
{
} // base_tweener::~base_tweener()
/*----------------------------------------------------------------------------*/
claw::tween::base_tweener* claw::tween::base_tweener::clone() const
{
return do_clone();
} // base_tweener::clone()
/*----------------------------------------------------------------------------*/
bool claw::tween::base_tweener::is_finished() const
{
return do_is_finished();
} // base_tweener::is_finished()
/*----------------------------------------------------------------------------*/
double claw::tween::base_tweener::update( double dt )
{
CLAW_PRECOND( dt >= 0 );
const double result = do_update(dt);
if ( is_finished() )
notify_finished();
CLAW_POSTCOND( result <= dt );
CLAW_POSTCOND( result >= 0 );
return result;
} // base_tweener::update()
/*----------------------------------------------------------------------------*/
void claw::tween::base_tweener::on_finished( finish_callback f )
{
m_on_finished.push_back(f);
} // base_tweener::on_finished()
/*----------------------------------------------------------------------------*/
void claw::tween::base_tweener::notify_finished() const
{
// If one of the callbacks deletes the tweener, then m_on_finished will not be
// available. Since we still want to execute all the callbacks, we iterate on
// a copy of it.
const std::list<finish_callback> callbacks(m_on_finished);
for ( std::list<finish_callback>::const_iterator it=callbacks.begin();
it!=callbacks.end(); ++it )
(*it)();
} // base_tweener::notify_finished()
assert.hpp
Some assert macros to strengthen you code.
CLAW_PRECOND
#define CLAW_PRECOND(b)
Abort the program if a precondition is not true.
Definition assert.hpp:98
CLAW_POSTCOND
#define CLAW_POSTCOND(b)
Abort the program if a postcondition is not true.
Definition assert.hpp:101
base_tweener.hpp
Common interface for all tweeners.
claw::tween::base_tweener
Common interface for all tweeners.
Definition base_tweener.hpp:45
claw::tween::base_tweener::update
double update(double dt)
Update the base_tweener of a given amount of time.
Definition base_tweener.cpp:66
claw::tween::base_tweener::finish_callback
boost::function< void()> finish_callback
The type of the function called to notify the end of the tweener.
Definition base_tweener.hpp:51
claw::tween::base_tweener::clone
base_tweener * clone() const
Create a copy of this allocated with new.
Definition base_tweener.cpp:46
claw::tween::base_tweener::~base_tweener
virtual ~base_tweener()
Destructor.
Definition base_tweener.cpp:37
claw::tween::base_tweener::on_finished
void on_finished(finish_callback f)
Execute the callbacks notifying about the finish of the tweener.
Definition base_tweener.cpp:85
claw::tween::base_tweener::is_finished
bool is_finished() const
Tell if the tweener has reached his total duration.
Definition base_tweener.cpp:55