// Interface for the Position class
// CSE143 HW6

#ifndef _POSITION_H
#define _POSITION_H

enum Direction { North, East, South, West };
const int NumDirections = 4;

// Returns true iff the direction is valid (one of the enum values)
bool validDir(Direction dir);

// Returns the opposite direction, i.e. North for South, East for West, etc.
Direction oppositeDir(Direction dir);

// Returns the next direction clockwise (e.g. nextDir(North) = East).
Direction nextDir(Direction dir);

// Position: models a pair of screen coordinates (x,y).
class Position {
public:
	// Initialize the position at (0,0)
	Position();
	// Initialize the position to (x,y)
	Position(int x, int y);
	// Initialize the position to same as the other position
	Position(const Position& other);
	// Set the position to be the same as the other position
	Position& operator =(const Position& other);
	// = x coordinate of this position
	int getX() const;
	// = y coordinate of this position	
	int getY() const;
	// Move the position <distance> units in direction <dir>, where North
	// is up the screen (bigger y's) and East is right on the screen (bigger
	// x's).
	void move(Direction dir, int distance);

	// Rotate this position around <axis>, according to <dir>: rotate 90, 180,
	// or 270 degrees clockwise, for <dir> = East, South or West, respectively.
	// If <dir> = North, ignore. Returns the new position.
	void rotate(Position axis, Direction dir);
private:
	int x, y;	// Coordinates;
};

#endif // end of file