/*******************************************/
/*  Sweepable Formant (2-pole)             */
/*  Filter Class, by Perry R. Cook, 1995-96*/ 
/*  See books on filters to understand     */
/*  more about how this works.  Nothing    */
/*  out of the ordinary in this version.   */
/*******************************************/

#if !defined(__FormSwep_h)
#define __FormSwep_h

#include "Filter.h"

class FormSwep : public Filter
{
 protected:  
  MY_FLOAT poleCoeffs[2];
  MY_FLOAT freq;
  MY_FLOAT reson;
  int dirty;
  MY_FLOAT targetFreq;
  MY_FLOAT targetReson;
  MY_FLOAT targetGain;
  MY_FLOAT currentFreq;
  MY_FLOAT currentReson;
  MY_FLOAT currentGain;
  MY_FLOAT deltaFreq;
  MY_FLOAT deltaReson;
  MY_FLOAT deltaGain;
  MY_FLOAT sweepState;
  MY_FLOAT sweepRate;
 public:
  FormSwep();
  ~FormSwep();
  void clear();
  void setPoleCoeffs(MY_FLOAT *coeffs);
  void setGain(MY_FLOAT aValue);
  void setFreqAndReson(MY_FLOAT aFreq, MY_FLOAT aReson);
  void setStates(MY_FLOAT aFreq, MY_FLOAT aReson, MY_FLOAT aGain);
  void setTargets(MY_FLOAT aFreq, MY_FLOAT aReson, MY_FLOAT aGain);
  void setSweepRate(MY_FLOAT aRate);    
  void setSweepTime(MY_FLOAT aTime);    
  MY_FLOAT tick(MY_FLOAT sample);
};

#endif