#ifndef _WALK2D_H
#define _WALK2D_H

#include "point.h"

class RandomWalk2D
{
  public:
   RandomWalk2D(long maxSteps,
                int size);      // # of steps, size of one step
    void Init();                // take first step of walk
    bool HasMore();             // returns false if walk finished, else true
    void Next();                // take next step of random walk
    void Simulate();            // complete an entire random walk
    
    long  TotalSteps() const;   // total # of steps taken by molecule
    Point Position()   const;   // current position
    Point Current()    const;   // alias for Position

  private:
    void TakeStep();       // simulate one step of walk   
    Point myPosition;      // coordinate of current position
    long  mySteps;         // # of steps taken
    int   myStepSize;      // size of step
    long  myMaxSteps;      // maximum # of steps allowed
};

#endif