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

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#ifndef ACCELERATION_OPERATOR
#define ACCELERATION_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 AccelerationOperator : public GlobalForceOperator<__EntityType>
   {
   public:
      AccelerationOperator() {}
      AccelerationOperator( float x, float y, float z ) : mAcceleration( x, y, z ) 
      {
      }

      virtual ~AccelerationOperator()
      {
      }

      void setAcceleration( const gmtl::Vec3f& acceleration )
      {
         mAcceleration = acceleration;
      }

      const gmtl::Vec3f& getAcceleration() const { return mAcceleration; }

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

   private:
      gmtl::Vec3f mAcceleration;
   };

   //: apply this force function to the particle
   template< class __EntityType >
   void AccelerationOperator<__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
            // Force = kilograms * ------ = kilograms * acceleration
            //                     sec^2

            // calculate how much force it will take to accelerate the particle
            gmtl::Vec3f force = mAcceleration * p->mass();
            p->applyForce( force );
            //cout<<"Applied force "<<force[0]<<" "<<force[1]<<" "<<force[2]<<"\n"<<flush;
         }
      }
   }

} // end of namespace

#endif

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