#ifndef _QCamFindShift_hotSpot_hpp_
#define _QCamFindShift_hotSpot_hpp_

#include "QCamFindShift.hpp"
#include "Vector2D.hpp"

class QVGroupBox;
class QCamSlider;
class QFrameDisplay;

/** Find the shift between two frame by looking at the brighter hot spot
    of the frame. */
class QCamFindShift_hotSpot : public QCamFindShift {
   Q_OBJECT;
public:
   QCamFindShift_hotSpot();
   QWidget * buildGUI(QWidget *);
   virtual QCamFrame image() const;
public slots:
   /** only pixel above this value (tresh) are taken in account */
   void setSeuil(int value);
   /** activate the auto mode for the tresh calculation */
   void setAutoSeuil(bool value);
  
   /** size of the moving box used to search the hot spot.
       size must be smaller than the distance between two
       possible hot spot.
    */
   void setSearchBoxSize(int value);

   /** binning applyed in the search box when
       searching the hotspot. Will speed up search when
       box is big, butt will be less accurate */
   void setBinning(int value);
signals:
   void seuilChanged(int);
   void autoSeuilChanged(bool);
   void searchBoxSizeChanged(int);
protected:
   bool registerFirstFrame();
   bool findShift(ShiftInfo & shift);
   Vector2D firstHotSpot_;
private:
   void computeCenterImg(int size,const Vector2D & center);
   bool findHotSpot(Vector2D & shift);
   double findHotSpot(const Vector2D & from,
                      Vector2D & center);
   int computeSeuil() const;
   int computePixelWeight(int pixelVal) const {
      pixelVal-=seuil_;
      if (pixelVal>0) {
         pixelVal=pixelVal*255/(255-seuil_);
         pixelVal*=pixelVal;  
      }
      return pixelVal;
   }
   double computeBarycenter(const Vector2D & from,
                            int seuil,int step,
                            int size,
                            Vector2D & bary,
                            double maxCoverage) const;
   double lastBrightness_;
   Vector2D lastCenter_;
   
   int searchBoxSize_;
   int seuil_;

   int binning_;

   QCamFrame centerImg_;
   
   /* GUI data */
   QVGroupBox * mainBox_;
   QCamSlider * seuilSlider_;
   QCamSlider * bigBoxSlider_;
   QFrameDisplay * dispImgCenter_;
   bool autoSeuil_;
};

#endif