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c:/home/kevn/src/animaniac/ani/Dynamics/operators/CurrentOperator.h

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#ifndef CURRENT_OPERATOR
#define CURRENT_OPERATOR

#include <boost/smart_ptr.hpp>
#include <gmtl/Vec.h>
#include "ani/Dynamics/Operator.h"
#include "ani/Dynamics/DynamicSystem.h"
#include <ani/Dynamics/operators/GlobalForceOperator.h>

namespace ani
{
   template<class __EntityType>
   class CurrentOperator : public GlobalForceOperator<__EntityType>
   {
   public:
      CurrentOperator() : mSpeed()
      {
      }

      virtual ~CurrentOperator()
      {
      }

      void setSpeed( const gmtl::Vec3f& speed )
      {
         mSpeed = speed;
      }

      //: apply this force function to the particle
      virtual void exec( DynamicSystem<__EntityType>& ps, float timeDelta );

   private:
      gmtl::Vec3f mSpeed;
   };

   //: apply this force function to the particle
   template< class __EntityType >
   void CurrentOperator<__EntityType>::exec( ani::DynamicSystem<__EntityType>& ps, float timeDelta )
   {
      std::vector<EntityTypePtr>::iterator it;
      for ( it = ps.entities().begin(); it != ps.entities().end(); ++it)
      {
         EntityTypePtr p = *it;
         if (this->isIgnored( p ) == false)
         {
            //                meters   velocity 
            // acceleration = ------ = --------
            //                sec^2      sec
            gmtl::Vec3f& acc = mSpeed;

            //                     meters
            // Force = kilograms * ------ = kilograms * acceleration
            //                     sec^2

            // calculate how much force it will take to accelerate the particle
            gmtl::Vec3f force = acc * p->mass();
            p->applyForce( force );
         }
      }
   }
} // end of namespace

#endif

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