C3DForcePSA.h

#ifndef FORCE_PSA_H_
#define FORCE_PSA_H_

#include "C3DVector3.h"
#include "C3DElementNode.h"
#include "C3DParticleSystemCommon.h"

namespace cocos3d
{
class C3DElementNode;
class C3DParticleSystem;

/**
A C3DForcePSA affects particle's action by force.
It is a optional for a particle system
*/
class C3DForcePSA : public C3DBaseParticleAction
{
public:

	/**
	constructor & destructor
	*/
	C3DForcePSA(C3DParticleSystem* system);
	virtual ~C3DForcePSA();

	/**
	load C3DForcePSA from element node
	*/
	virtual	void load(C3DElementNode* properties);

	/**
	save C3DForcePSA to element node
	*/
	virtual void save(C3DElementNode* properties);

	/**
	change particle state, called by C3DParticleSystem
	*/
	virtual void action(long elapsedTime);

	/**
	set & get force affect the particles
	*/
	void setForce(const C3DVector3& force) { _force = force; }
	C3DVector3 getForce() const { return _force; }

	/**
	clone method
	*/
    virtual C3DBaseParticleAction* clone(C3DParticleSystem* system) const;

private:

   C3DVector3 _force;

};
}

#endif