#ifndef _RLEPair_H

#define _RLEPair_H

#include "list.h"

// Indicates a series of black pixels in a row.

class RLEPair {

public:

  RLEPair()

    :start(0),end(0) {};

  RLEPair(int first, int last, int thisRow)

    :start(first), end(last), row(thisRow) {};

  RLEPair(int first, int last)

    :start(first), end(last), row(-1) {};

  ~RLEPair() {};

  short int start;

  short int end;

  short int row;

};

class RLEPairs :public List {

 public:

  RLEPairs(int row_num);

  ~RLEPairs();

  // Create RLEPair Representation of contents read from TIFF file

  void fill(unsigned char * contents, int contentsLength, int contentsRow);

  int pixelsBetween(int start, int end);

  int numPixels;

  void shift(int);

  void draw_pairs(char * window, double scaleFactor, 

		  int y_coord, char* color, double width);

  void print_pairs();

  RLEPairs * extract(int startcol, int endcol);   

  // create a copy of this from  startcol to endcol.

 // and return pointer to RLEPairs

  void  merge(RLEPairs * pairs);

  // Merges  pairs into this.

  private:

    int row;

};

#endif