// CSE 143 
// Homework 5 
// http://www.cs.washington.edu/education/courses/143/00su/homework/ 
// 30 Jul 2000, Ken Yasuhara

// class MovingObject 
//
// objects moving w/ constant velocity, i.e. not subject to any
// acceleration (e.g. gravity); see also, Projectile


#ifndef _MOVINGOBJECT_H_
#define _MOVINGOBJECT_H_

#include "object.h"


class MovingObject : public Object {
public:
  MovingObject(const double newX, const double newY, 
               const double newVx, const double newVy) 
    : Object(newX, newY), vx(newVx), vy(newVy), doneFlag(false) {}

  virtual void getNextPosition(double &nextX, double &nextY);
  virtual void updatePosition();

  virtual void paint(GP142Display &display) const = 0;

  bool isDone() const { return doneFlag; }

protected:
  // effectively disallow public use of default constructor
  MovingObject() {}

  // x and y components of velocity in pixels per frame update
  double vx, vy;

  bool doneFlag;
};


#endif // _MOVINGOBJECT_H_