Untitled

import draw.*;
import colors.*;
import geometry.*;
import java.util.Random;

// the world of UFO's, AUPs, and Shots
class UFOWorld {
  UFO ufo;
  AUP aup;
  IShots shots;
//  Color BACKG = new Blue();
  int HEIGHT = 500;
  int WIDTH = 200;

  UFOWorld(UFO ufo, AUP aup, IShots shots)
  {
    this.ufo = ufo;
    this.aup = aup;
    this.shots = shots;
  }
}

// an AUP: a rectangle whose upper left corner is located at (location, bottom)
class AUP {
  int location;
  // Color aupColor = new Red();

  AUP(int location) {
    this.location = location;
  }
}

// A UFO whose center is located at location
class UFO {
  Posn location;
  // Color colorUFO = new Green();

  UFO(Posn location) {
    this.location = location;
  }
}

// managing a number of shots
interface IShots{}

// the empty list of shots
class MTShots implements IShots{
  MTShots(){}
}

// a class with atleast one shot
class ConsShots implements IShots {
  Shot first;
  IShots rest;

  ConsShots(Shot first, IShots rest)
  {
  this.first = first;
  this.rest = rest;
}}

// a shot in flight, whose upper left corner is located at location
class Shot {
  Posn location;
  // Color shotColor = new Yellow();

  Shot(Posn location) {
    this.location = location;
  }
  }

/*/ a Posn class
class Posn {
  int x;
  int y;

  Posn(int x, int y){
    this.x = x;
    this.y = y;
  }
}*/

class Examples {
  // an anti-UFO platform placed in the center:
  AUP a = new AUP(100);

  // a IFP placed on the cemter near the top ff the world
  UFO u = new UFO(new Posn(100,5));

  // a UFO placed in the center somewhat below u
  UFO u2 = new UFO(new Posn(100, 8));

  // A shot, right after being fired from a
  Shot s = new Shot(new Posn(110, 490));

  // another shot above s
  Shot s2 = new Shot(new Posn(110, 485));

  // an empty list of shots
  IShots le = new MTShots();

  // a list of one shot
  IShots ls = new ConsShots(s, new MTShots());

  // a list of two shots, one above the other
  IShots ls2 = new ConsShots(s2, new ConsShots(s, new MTShots()));

  // a complete world with an empty list of shots
  UFOWorld w = new UFOWorld(u,a,le);

  // a complete world, with 2 shots
  UFOWorld w2 = new UFOWorld(u,a,ls);
}