// Aircraft class

// Aircraft denotes a generic aircraft object. 
// This class is an abstract class as it has a pure virtual function. Hence
// it can't be instantiated. Derived classes are created which correspond to
// particular aircrafts like a plane.

#ifndef AIRCRAFT_H
#define AIRCRAFT_H

#include "gp142display.h"

class Aircraft {
public:
	// The constructor
	Aircraft ();

	// draws the aircraft object. It must be implemented by a derived class
	virtual void draw () const = 0;

	// = x-coordinate of the plane on the display
	virtual int getX () const;

	// = y-coordinate of the plane on the display
	virtual int getY () const;

	// sets the x-coordinate of the plane to x
	virtual void setX (int x);

	// sets the y-coordinate of the plane to y
	virtual void setY (int y);

	// returns true if the plane is facing left
	virtual bool isFacingLeftOrNot () const;

	// changes the x-coordinate of the plane by deltaX
	virtual void changeX (int deltaX);

	// changes the y-coordinate of the plane by deltaY
	virtual void changeY (int deltaY);

	// = velocity of the plane
	virtual int getVelocity () const;

	// destructor for aircraft
	virtual ~Aircraft ();

protected:
	GP142Display *display;	// screen on which the aircraft will be displayed
	int velocity;			// velocity of the aircraft
	int x, y;				// coordinates of the aircraft on the display
	bool isFacingLeft;		// is the aircraft moving from right to left
};

#endif