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// Copyright (c) 2003-2008 INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/Circular_kernel_2/include/CGAL/IO/Dxf_variant_reader.h $
// $Id: include/CGAL/IO/Dxf_variant_reader.h 08b27d3db14 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Monique Teillaud, Sylvain Pion
// Andreas Fabri, Ron Wein, Julien Hazebrouck
// Partially supported by the IST Programme of the EU as a Shared-cost
// RTD (FET Open) Project under Contract No IST-2000-26473
// (ECG - Effective Computational Geometry for Curves and Surfaces)
// and a STREP (FET Open) Project under Contract No IST-006413
// (ACS -- Algorithms for Complex Shapes)
// Description of the file format can be found at the following address:
// https://images.autodesk.com/adsk/files/autocad_2012_pdf_dxf-reference_enu.pdf
#ifndef CGAL_IO_DXF_VARIANT_READER_H
#define CGAL_IO_DXF_VARIANT_READER_H
#include <CGAL/license/Circular_kernel_2.h>
#include <CGAL/IO/Dxf_reader_doubles.h>
#include <iostream>
#include <string>
#include <list>
#include <variant>
#include <CGAL/array.h>
namespace CGAL {
template<class CK,class Circular_arc_2, class Line_arc_2, class OutputIterator>
OutputIterator variant_load(std::istream& is, OutputIterator res)
{
typedef std::array<double, 3> Triplet;
typedef typename CK::FT FT;
typedef typename CK::Circular_arc_point_2 Circular_arc_point_2;
typedef typename CK::Root_of_2 Root_of_2;
typedef typename CK::Root_for_circles_2_2 Root_for_circles_2_2;
typedef typename CK::Line_2 Line_2;
typedef typename CK::Point_2 Point_2;
typedef typename CK::Circle_2 Circle_2;
typedef typename std::variant< Circular_arc_2, Line_arc_2 > Arc;
typedef std::list<Triplet> Polygon;
typedef std::list<Polygon> Polygons;
typedef std::list<Triplet> Circles;
Polygons polygons;
Circles circles;
CGAL::Dxf_reader_doubles reader;
reader(is, polygons, circles);
std::cout << "Read " << polygons.size() << " polygons, and "
<< circles.size() << " circles" << std::endl;
for(typename Circles::iterator it = circles.begin(); it != circles.end(); it++){
Arc arc = typename CK::Construct_circular_arc_2()(typename CK::Construct_circle_2()(typename CK::Construct_point_2()((*it)[0], (*it)[1]), FT((*it)[2])));
*res++ = arc;
}
std::map<std::pair<double,double>, Circular_arc_point_2> points;
typename std::map<std::pair<double,double>, Circular_arc_point_2>::iterator p_cap_it;
double bulge;
Circular_arc_point_2 caps, capt;
Arc arc;
for(typename Polygons::iterator it = polygons.begin(); it != polygons.end(); it++){
typename Polygon::iterator pit = it->begin();
std::pair<double,double> xyfirst = std::make_pair((*pit)[0], (*pit)[1]);
std::pair<double,double> xyps, xypt = std::make_pair((*pit)[0], (*pit)[1]);
Point_2 ps, pt = typename CK::Construct_point_2()(xypt.first, xypt.second);
Point_2 first = pt;
while(true){
xyps = xypt;
ps = pt;
bulge = (*pit)[2];
pit++;
if(pit ==it->end()){
break;
}
xypt = std::make_pair((*pit)[0], (*pit)[1]);
pt = typename CK::Construct_point_2()(xypt.first, xypt.second);
p_cap_it = points.find(xyps);
if(p_cap_it == points.end()){
caps = typename CK::Construct_circular_arc_point_2()(ps);
points.insert(std::make_pair(xyps, caps));
}else{
caps = p_cap_it->second;
}
p_cap_it = points.find(xypt);
if(p_cap_it == points.end()){
capt = typename CK::Construct_circular_arc_point_2()(pt);
points.insert(std::make_pair(xypt, capt));
} else {
capt = p_cap_it->second;
}
if(bulge == 0){
if(xyps != xypt){
typename CK::Line_2 l(ps,pt);
Line_arc_2 la = typename CK::Construct_line_arc_2()(l,caps, capt);
arc = la;
*res++ = arc;
}
} else {
Circular_arc_2 carc = typename CK::Construct_circular_arc_2()(typename CK::Construct_circle_2()(ps, pt, bulge),
caps, capt);
arc = carc;
*res++ = arc;
}
}
if(bulge == 0){
if(xypt != xyfirst){
arc = typename CK::Construct_line_arc_2()(typename CK::Construct_line_2()(pt, first),capt, points.find(xyfirst)->second);
*res++ = arc;
}
} else {
Circular_arc_2 carc = typename CK::Construct_circular_arc_2()(typename CK::Construct_circle_2()(pt, first, bulge),
capt, points.find(xyfirst)->second);
arc = carc;
*res++ = arc;
}
}
std::cout << " Loaded" << std::endl;
return res;
}
}// namespace CGAL
#endif // CGAL_IO_DXF_VARIANT_READER_H
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