//*****************************************************************************************
// Truevision - a 3d modeler for povray
//
// polygon.h
//
// Vincent LE PRINCE <vincentleprince@users.sourceforge.net>
// Copyright (C) 2000-2005 Vincent LE PRINCE
// This file is part of the TRUEVISION Package

//   This program is free software; you can redistribute it and/or modify
//   it under the terms of the GNU General Public License as published by
//   the Free Software Foundation; either version 2 of the License, or
//   (at your option) any later version.
//
//   This program is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//   GNU General Public License for more details.
//
//   You should have received a copy of the GNU General Public License
//   along with this program; if not, write to the Free Software
//   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */ 
//*******************************************************************************************
#ifndef TV_POLYGON_H
#define TV_POLYGON_H
using namespace std;
#include "object3d.h"
#include "include/obj3dcsg.h"
#include <vector>
#include "include/utils3d.h"
#include "include/vertex.h"

class Mesh;
class ExtractTool;

// Mesh Quads
class Polygon {
	friend class ExtractTool;

	private:
		vector<Vertex*> points;
		int pickname;
		bool selected;
		double normal[3];
		double center[3];
		
	public:
		Polygon() { selected = false; }
		Polygon( Polygon & ref );
		~Polygon() { points.clear(); }
		
		void add_point( Vertex *point ) { points.push_back( point ); }
		void clear_points() { points.clear(); }
		void display( int smooth_type, bool trans = false, int pick = -1 );
		void push_normal();
		void select() { selected = true; }
		void unselect() { selected = false; }
		void toggle_selection() { selected = ! selected; }
		bool is_selected() { return selected; }
		bool is_picked( int pick ) { return ( pick == pickname ) ? true : false; }
		void output_to_povray( ofstream & file, int smooth_type );
		void save( ofstream & file, Mesh *mesh );
		void load(  ifstream & file, char *tag, Mesh *mesh );
		int get_size() { return points.size(); }
		Vertex *get_point( int i ) { return points[i]; }
		void compute_normal();
		double *get_poly_normal() { compute_normal(); return normal; }
		void compute_center();
		double *get_poly_center() { compute_center(); return center; }
		
		void swap_points( Vertex *orig, Vertex *changed );
		bool use_point( Vertex *pt );
		void push_edges( Mesh *mesh );
		
		void extract( Mesh *mesh );
		void tesselate( Mesh *mesh );
		void flatten();
};


#endif