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


#include "moon.h"
#include "gp142.h"


// virtual 
void 
Moon::getNextPosition(double &nextX, double &nextY)
{
  MovingObject::getNextPosition(nextX, nextY);

  int sign = (vx < 0.0) ? -1 : 1;
  if ((sign ==  1 && (int)nextX > (GP142_XMAX + (int)radius)) ||
      (sign == -1 && (int)nextX < -(GP142_XMAX + (int)radius))) {
    nextX = -sign * GP142_XMAX;   
  }
}


// virtual 
void 
Moon::paint(GP142Display &display) const
{
  display.drawCircle((int)x, (int)y, (int)radius, White);
  display.drawCircle((int)(x + 0.5 * radius), (int)(y + 0.1 * radius), 
                     (int)radius, Black);
}