TFEval.h

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//------------------------------------------------------------------------
//
//   Joe Kniss
//     3-20-03
//                   ________    ____   ___ 
//                  |        \  /    | /  /
//                  +---+     \/     |/  /
//                  +--+|  |\    /|     < 
//                  |  ||  | \  / |  |\  \ 
//                  |      |  \/  |  | \  \ 
//                   \_____|      |__|  \__\
//                       Copyright  2003 
//                      Joe Michael Kniss
//                   <<< jmk@cs.utah.edu >>>
//               "All Your Base are Belong to Us"
//-------------------------------------------------------------------------

/// TFEval.h

/// Evaluator strategies for transfer function elements

#ifndef __SIMIAN_TF_EVAL_DOT_H
#define __SIMIAN_TF_EVAL_DOT_H

#include <smartptr.h>
#include "TFParams.h"

/// the domain of input to an evaluator should be
/// normalized (somehow) to [-1,1].  The range of 
/// output will be [0,1].  The evaluator should be
/// max at pos 0, and probably min at -1 and 1

////////////////////////////////////////////////////
/// the base (abstract) interface for evaluators
class TFEval : public gutz::Counted {
public:
   typedef STF::tfSType Type; 
   
   virtual ~TFEval() {}

   virtual Type eval(const Type &pos) const = 0;

protected:
   TFEval(){}

};

typedef gutz::SmartPtr<TFEval> TFEvalSP;

////////////////////////////////////////////////////
/// a gaussian 
class TFEvalGaus : public TFEval {
public:
   TFEvalGaus() {}
   ~TFEvalGaus() {}

   TFEval::Type eval(const TFEval::Type &pos) const
   {
      return TFEval::Type(exp(-pos * 3.6));  
   }

};

////////////////////////////////////////////////////
/// a linear ramp
class TFEvalLin : public TFEval {
public:
   TFEvalLin() {}
   ~TFEvalLin() {}

   TFEval::Type eval(const TFEval::Type &pos) const
   {
      return gutz::clamp(-1 * gutz::g_abs(pos) + 1);
   }

};



#endif

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