#include "library.h"

const int fwidth = 800, fheight = 600, boundary = 25;

struct targetless_actor
{ double x, y, speed;
  int colour;

  targetless_actor(double ox, double oy, double sp, int co)
  { x = ox;
    y = oy;
    speed = sp;
    colour = co; }

  void draw()
  { set_pen_width(7);
    set_pen_color(colour);
    draw_point(boundary + x, boundary + y); } };

struct actor: public targetless_actor
{ targetless_actor & target;
  
  actor(double ox, double oy, double sp, int co, targetless_actor & t):
    target(t), targetless_actor(ox, oy, sp, co)
  { }

  void draw()
  { targetless_actor::draw();
    double dir = atan2(target.x - x, target.y - y);
    move_to(x, y);
    set_heading_radians(dir);
    set_pen_width(4);
    draw_distance(50); } };

void main()
{ make_window(fwidth + 2 * boundary, fheight + 2 * boundary);
  set_pen_width(3);
  move_to(boundary, boundary);
  draw_to(fwidth + boundary, boundary);
  draw_to(fwidth + boundary, fheight + boundary);
  draw_to(boundary, fheight + boundary);
  draw_to(boundary, boundary);
  targetless_actor tree(fwidth - 100, fheight / 2, 0, color::green);
  actor boy(75, fheight, 7, color::blue, tree);
  actor bull(50, 50, 6, color::red, boy);
  tree.draw();
  boy.draw();
  bull.draw(); }