/*
 * cgal_helper.h - Conversions between poly2d and CGAL
 *
 * Written 2012, 2015 by Werner Almesberger
 * Copyright 2012, 2015 by Werner Almesberger
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 */

#ifndef CGAL_HELPER_H
#define	CGAL_HELPER_H

/*
 * References:
 * http://www.cgal.org/Manual/latest/examples/Straight_skeleton_2/
 *   Create_saop_from_polygon_with_holes_2.cpp
 * http://www.cgal.org/Manual/latest/examples/Straight_skeleton_2/print.h
 */

extern "C" {
	#include <stdbool.h>

	#include "poly2d.h"
}

#include <vector>

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_with_holes_2.h>


typedef CGAL::Exact_predicates_inexact_constructions_kernel K;

typedef CGAL::Polygon_2<K> Polygon_2;


static inline Polygon_2 p2d_to_P2(const struct p2d *p, bool ccw)
{
	const struct v2d *v;
	Polygon_2 np;

	v = p->v;
	do {
		np.push_back(K::Point_2(v->x, v->y));
		v = v->next;
	}
	while (v != p->v);
	if (p2d_is_cw(p) == ccw)
		np.reverse_orientation();
	return np;
}


static inline struct p2d *P2_to_p2d(Polygon_2 p)
{
	struct p2d *np;

	np = p2d_new();
	for (Polygon_2::Vertex_iterator vit = p.vertices_begin();
	    vit != p.vertices_end(); ++vit)
		p2d_append(np, v2d_new(vit->x(), vit->y()));
	p2d_close(np);
	return np;
}

#endif /* !CGAL_HELPER_H */