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

Go to the documentation of this file.

#ifndef FLAME_EMITTER
#define FLAME_EMITTER

#include "gmtl/Math.h"
#include "ani/Dynamics/Operator.h"
#include "ani/Dynamics/DynamicSystem.h"
#include "ani/Dynamics/operators/Emitter.h"

namespace ani
{
   template<class __EntityType>
   class FlameEmitter : public Emitter<__EntityType>
   {
   public:
      typedef boost::shared_ptr<__EntityType> EntityTypePtr;

   public:
      FlameEmitter() : Emitter<__EntityType>(), 
                      x(0), 
                      velocitizer(0), 
                      kRandMax( RAND_MAX ), 
                      mSize( 8 ) 
      { 
          srand(2); 
      }

      virtual ~FlameEmitter() {}
      void setPos( const gmtl::Vec3f& pos )
      {
         mPos = pos;  
      }   
      void setSize( float size ) { mSize = size; }
      virtual void exec( DynamicSystem<__EntityType>& sys, float timeDelta )
      {
         for (x += sys.timeDelta(); x > mRate; x -= mRate )
         {
            EntityTypePtr p( new __EntityType );
            p->setMass( 1.0f ); // 1 kilogram
            float r1 = rand(), r2 = rand(), r3, r4 = rand(), r5 = rand();
            r1 /= kRandMax;
            r2 /= kRandMax;
            r4 /= kRandMax;
            r5 /= kRandMax;
            r3 = (r1 + r2) * 0.5f;

            // compute random position within the space.
            float posx = -mSize * 0.5f + r4 * mSize;
            float posz = -mSize * 0.5f + r5 * mSize;

            // make the velocity increase in the middle.
            float vely = 1.0f - gmtl::Math::Min( gmtl::Math::abs(posx / mSize), gmtl::Math::abs(posz / mSize) );
            const float multifactor = 3.0f;

            float velx = r1 * 2.0f - 1.0f;
            float velz = r2 * 2.0f - 1.0f;
            gmtl::Vec3f velocity( velx, (r3 * 1.0f + 3.8f) * (vely * multifactor), velz );

            gmtl::Vec3f position( posx + mPos[0], 0.0f + mPos[1], posz + mPos[2] );
            gmtl::Vec4f color( 0.0f, 0.0f, 0.0f, 1.0f );
            p->setVelocity( velocity );
            p->setPosition( position );
            p->setColor( color );
            p->setAgeOfDeath( mAgeOfDeath );
            sys.push_back( p );
         }

         if (x < 0) x = 0;
      }

      float x;
      float velocitizer;
      const float kRandMax;
      float mSize;
      gmtl::Vec3f mPos;
   };
} // end namespace

#endif

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