# ifndef _SGL_LINKS
# include "sgl_links.h"
# endif

# define _SGL_CLASS

/*******************************************************
 *					      class: sgl
 *
 * Class which encompasses many of the glut basic
 * initialization, closing, functions, and object
 * creation and painting
 * If necessary this class should be instansiated
 * and several functions may be overloaded.
 * However, this class should work as is in
 * conjunction with the sgl_shapes class.
 *******************************************************/
class sgl : public Link {		// static? What does that mean?

 public:			// should be protected
  static GLfloat time;
  static GLfloat distance;
  static GLfloat aperture;
  static GLfloat focus;
  static GLfloat view_ratio;
  static GLfloat view_rotx;
  static GLfloat view_roty;
  static GLfloat view_rotz;

 public:
   
    sgl() : Link(NO_ACTION) {};		// default empty constructor
    sgl(int argc, char *argv[]): Link(NO_ACTION) { init(argc, argv);};
    ~sgl() {};			// default empty destructor
				// calls ~Link automatically

    void init(int argc, char * argv[], int,int,int,int);
    void init(int argc, char * argv[]);
    void init(int,int,int,int);
    void init();
    static void setProjection();
    static void setProjection(GLfloat);
    static void advance();
    static void advance(GLfloat);
    static void idle();
    static void downarrow(int,int,int);
    static void downkey(unsigned char,int,int);
    static void visible(int);
    static void reshape(int, int);
    void paint();
    void print();
    GLfloat gettime() { return time; }
};