/**********************************************************************************
 ***   FILE: mov_obj.cpp
 ***   DATE: Jan 14, 2004
 *** AUTHOR: Daniel Dementiev
 ***   GOAL: This is a short example illustrating class definition syntax in C++.
 ***         Designed for IST482 class.
 **********************************************************************************/

#include <iostream>
using namespace std;

class MovingObject {
   public:
      enum Direction {North, West, South, East};
      MovingObject();
      int getX();
      int getY();
      void step();
      void speed_up();
      void slow_down();
      void turn(Direction new_dir);
   private:
      int x, y;  // current coordinates of the object
      Direction dir;   // direction of the object
      int speed; // speed of the object
};

inline MovingObject::MovingObject()
{
	x = y = 0;
	speed = 1;
	dir = South;
}

inline int MovingObject::getX()
{
	return x;
}

inline int MovingObject::getY()
{
	return y;
}

inline void MovingObject::step()
{
	switch( dir ){
		case North: y += speed; break;
		case West:  x -= speed; break;
		case South: y -= speed; break;
		case East:  x += speed; break;
	}
}

inline void MovingObject::speed_up()
{
	speed++;
}

inline void MovingObject::slow_down()
{
	if( speed ) speed--;
}

inline void MovingObject::turn(Direction new_dir)
{
	dir = new_dir;
}



/* ------------------------------------------------------------------------------ */

void main()
{
	MovingObject tank;
	for(int i=0;i<100;i++){
		if( i%4 == 0 ) // change direction
			switch( rand()%4 ){
				case 0: tank.turn(MovingObject::North); break;
				case 1: tank.turn(MovingObject::South); break;
				case 2: tank.turn(MovingObject::East); break;
				case 3: tank.turn(MovingObject::West); break;
			}
		if( i%7 == 0 ) // change speed
			if( i%7>3 ) tank.slow_down();
			else tank.speed_up();
		tank.step();
		cout<<"Tank is now at "<<tank.getX()<<", "<<tank.getY()<<endl;
	}
}

/* ****************************************************************************** */