trigger.h

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/***********************************************************************/
#ifndef TRIGGER_H_
#define TRIGGER_H_
 
class trigger
{
public:
  trigger( float _hysteresis)
  : hysteresis( _hysteresis),
    minimax(ZERO),
    going_up(true)
  {}
  bool initialize( float value, bool _going_up=true)
  {
    minimax = value;
    going_up=_going_up;
    return true;
  }
  bool process( float value)
  {
    if( going_up)
      {
    if( value > minimax)
      {
        minimax=value;
      }
    else
      {
        if( value < minimax - hysteresis)
          {
        minimax=value;
        going_up=false;
        return true;
          }
      }
    return false;
      }
    else
      {
    if( value < minimax)
      {
        minimax=value;
      }
    else
      {
        if( value > minimax + hysteresis)
          {
        minimax=value;
        going_up=true;
        return true;
          }
      }
    return false;
      }
  }
private:
  float hysteresis;
  float minimax;
  bool going_up;
};
 
 
 
#endif /* TRIGGER_H_ */