ViewportBufferFill.h

#ifndef VieportBufferFill_h
#define VieportBufferFill_h

#include "ViewportBufferAction.h"

class QRect;
class QPoint;

namespace Isis {
  class ViewportBufferFill : public ViewportBufferAction {
    public:
      ViewportBufferFill(const QRect &rect, const int &xCoef,
                         const double &xScale, const int &yCoef,
                         const double &yScale, const QPoint &topLeftPixel);
      ~ViewportBufferFill();


      virtual ViewportBufferAction::ActionType getActionType() {
        return ViewportBufferAction::fill;
      };

      double viewportToSample(int x) {
        return (x + p_xCoef) / p_xScale;
      }

      double viewportToLine(int y) {
        return (y + p_yCoef) / p_yScale;
      }

      int getRequestPosition() const {
        return p_requestPosition;
      }

      int getReadPosition() const {
        return p_readPosition;
      }

      void incReadPosition() {
        p_readPosition++;
      }

      void incRequestPosition() {
        p_requestPosition++;
      }

      QRect *getRect() {
        return p_rect;
      }

      int getTopmostPixelPosition();
      int getLeftmostPixelPosition();

      bool doneReading();
      bool shouldRequestMore();
      bool shouldPaint(int &linesToPaint);

      void stop();


    private:
      unsigned int p_readPosition;
      unsigned int p_requestPosition;
      QRect *p_rect;
      QPoint *p_topLeftPixel;
      int p_xCoef;
      double p_xScale;
      int p_yCoef;
      double p_yScale;

      const static int STEPSIZE = 20;
  };
}

#endif