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c:/home/kevn/src/animaniac/gator/AccelerateOperator.h

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#ifndef ACCEL_OPER
#define ACCEL_OPER
#include <vector>
#include "ani/Dynamics/Operator.h"
#include "ani/Dynamics/DynamicSystem.h"

namespace gator
{
   //: FORCE by Acceleration
   //  specify an acceleration, will compute the force for each particle to accelerate it that fast
   class Acceleration : public ani::Operator<ani::Body>
   {
   public:
      typedef boost::shared_ptr<ani::Body> EntityTypePtr;

   public:
      Acceleration() : ani::Operator<ani::Body>()
      {
      }

      Acceleration( float x, float y, float z ) : ani::Operator<ani::Body>(), mAcceleration( x, y, z )
      {
      }

      virtual ~Acceleration()
      {
      }

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

      //: apply this force function to the particle
      virtual void exec( ani::DynamicSystem<ani::Body>& ps, float timeDelta )
      {
         std::vector<EntityTypePtr>& entities = ps.entities();
         std::vector<EntityTypePtr>::iterator it;
         for ( it = entities.begin(); it != entities.end(); ++it)
         {
            ani::Body& p = *(*it);
            //                     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 );
         }
      }

   private:
      gmtl::Vec3f mAcceleration;
   };
} // end namespace gator

#endif

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