/*
 * graphic interface
 */

#ifndef INTERFACE_H
#define INTERFACE_H 

#include "attr.h"
#include "util.h"
#include "matrix.h"

#include <utility>

struct point : module_vec {
  vec v, n;		// vertex, normal
  attribute_set attr;	// attributes
  
  point(const module_vec &v, const vec &pos, const vec &up, const attribute_set &as) t_no
    : module_vec(v), v(pos), n(up), attr(as) {};
};

typedef vector<point> points;

// <0 cw, >0 ccw
double winding (const points &v) t_no;

struct gfx_int {
	virtual ~gfx_int () t_no {};
	
	virtual void begin_fig() t_no {};
	virtual void end_fig() t_no {};
	
	virtual void segment (const point &, const point &) t_err abstract;
	virtual void object (const points &) t_err abstract;
};

#endif