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#ifndef G4RTQtScanner_H
#define G4RTQtScanner_H 1

// class description:
//
// G4RTQtScanner
// Provides a sequence of window coordinates suitable for a visible
// window of ever increasing resolution.

#include "G4VRTScanner.hh"

#include <QScrollArea>

class G4ViewParameters;
class QLabel;
class QImage;

class G4RTQtScanner: public G4VRTScanner, QScrollArea {

  public: // with description

  G4RTQtScanner();
  virtual ~G4RTQtScanner();

  // Compiler defaults for copy constructor and assignmemt.

  virtual void Initialize(G4int nRow, G4int nColumn);
  // Intialises scanner for window with nRow rows and nColumn columns.

  virtual G4bool Coords(G4int& iRow, G4int& iColumn);
  // Supplies coordinate (iRow,iColumn) and returns false when the
  // sequence has finished, i.e., on the call *after* suplying the
  // last valid coordinate.

  virtual void Draw
  (unsigned char red, unsigned char green, unsigned char blue);
  // Draw coloured square at current position.

  G4bool GetQtWindow(const G4String& name, G4ViewParameters&);

protected:

  G4int theNRow, theNColumn, theIRow, theIColumn;
  G4int theWindowSizeX, theWindowSizeY;
  QLabel* fpImageLabel;
  QImage* fpImage;
};

#endif