#ifndef _OBSERVER_H
#define _OBSERVER_H

// a class for observing a one-dimensional random walk
// this version records the events of the walk for plotting with samba
//
//   WalkObserver(ostream & OutputStream, -- Constructor is given a stream
//                int maxWalkers             to send data to.  It needs
//                                           to know how many walkers it
//                                           will be watching so that it
//                                           can draw them at their initial
//                                           position
//
//
// void Update(RandomWalk & walker) --  called by a walking object
//                                      to observe (record) a walk
#include "CPstring.h"

class RandomWalk;  // the walker class that will be observed

class WalkObserver
{
  public:

    WalkObserver(ostream & OutputStream, int maxWalkers=1);
    void Update(RandomWalk & walker); // update information from walker
    
  private:
    
    void InitializeStream(int maxWalkers); //InitializeStream
    string GetColorFromID (int colorID); //Get Color
    int GetYFromID(int id);
    void WalkObserver::DrawRectangle (int id, double x, double y);
    void MoveRectangle (int ID, double x, double y);
    ostream & myOutputStream;	// output stream for data
    double myWidth;
    double myHeight;
};

#endif