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

// class TimedProjectile 
//
// Projectile with a built-in timer that advances once per frame
// update; allows behavior to change depending on time


#ifndef _TIMEDPROJECTILE_H_
#define _TIMEDPROJECTILE_H_

#include "projectile.h"


class TimedProjectile : public Projectile {
public:
  TimedProjectile(const double newX, const double newY, 
                  const double newVx, const double newVy) 
    : Projectile(newX, newY, newVx, newVy), frameCount(0) {}

  virtual void updatePosition();

  // returns number of frames updated since object's creation
  int getFrameCount() const { return frameCount; }

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

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

private:
  // starts at 0; incr. each time updatePosition is called
  int frameCount;
};


#endif // _TIMEDPROJECTILE_H_