(in-package #:clnl-nvm)

(defvar *current-id* 0)

(defvar *turtles* nil)
(defvar *patches* nil)
(defvar *myself* nil)
(defvar *self* nil)
(defvar *dimensions* nil)
(defvar *topology* :torus)
(defvar *ticks* nil)

(defstruct turtle who color heading xcor ycor (label "") (label-color 9.9d0) (size 1d0))
(defstruct patch color xcor ycor)

(defun agent-set-list (agent-set)
 (cond
  ((eql agent-set :turtles) *turtles*)
  ((eql agent-set :patches) *patches*)
  ((and (listp agent-set) (eql :agent-set (car agent-set))) (cdr agent-set))
  (t (error "Doesn't seem to be an agent-set: ~A" agent-set))))

(defun agent-set-p (o)
 (or
  (eql o :turtles)
  (eql o :patches)
  (and (listp o) (eql :agent-set (car o)))))

(defun agent-p (o)
 (or (turtle-p o) (patch-p o)))