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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* 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
* OpenSceneGraph Public License for more details.
*/
//osgParticle - Copyright (C) 2002 Marco Jez
#ifndef OSGPARTICLE_OPERATOR
#define OSGPARTICLE_OPERATOR 1
#include <osgParticle/Program>
#include <osg/CopyOp>
#include <osg/Object>
#include <osg/Matrix>
namespace osgParticle
{
// forward declaration to avoid including the whole header file
class Particle;
/** An abstract base class used by <CODE>ModularProgram</CODE> to perform operations on particles before they are updated.
To implement a new operator, derive from this class and override the <CODE>operate()</CODE> method.
You should also override the <CODE>beginOperate()</CODE> method to query the calling program for the reference frame
used, and initialize the right transformations if needed.
*/
class Operator: public osg::Object {
public:
inline Operator();
inline Operator(const Operator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
virtual const char* libraryName() const { return "osgParticle"; }
virtual const char* className() const { return "Operator"; }
virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const Operator* >(obj) != 0; }
/// Get whether this operator is enabled.
inline bool isEnabled() const;
/// Enable or disable this operator.
inline void setEnabled(bool v);
/** Do something on a particle.
This method is called by <CODE>ModularProgram</CODE> objects to perform some operations
on the particles. You must override it in descendant classes. Common operations
consist of modifying the particle's velocity vector. The <CODE>dt</CODE> parameter is
the time elapsed from last operation.
*/
virtual void operate(Particle* P, double dt) = 0;
/** Do something before processing particles via the <CODE>operate()</CODE> method.
Overriding this method could be necessary to query the calling <CODE>Program</CODE> object
for the current reference frame. If the reference frame is RELATIVE_RF, then your
class should prepare itself to do all operations in local coordinates.
*/
virtual void beginOperate(Program *) {}
/// Do something after all particles have been processed.
virtual void endOperate() {}
protected:
virtual ~Operator() {}
Operator &operator=(const Operator &) { return *this; }
private:
bool _enabled;
};
// INLINE FUNCTIONS
inline Operator::Operator()
: osg::Object(), _enabled(true)
{
}
inline Operator::Operator(const Operator& copy, const osg::CopyOp& copyop)
: osg::Object(copy, copyop), _enabled(copy._enabled)
{
}
inline bool Operator::isEnabled() const
{
return _enabled;
}
inline void Operator::setEnabled(bool v)
{
_enabled = v;
}
}
#endif
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