mirror of https://github.com/vitalif/openscad
284 lines
8.6 KiB
C++
284 lines
8.6 KiB
C++
/*
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* OpenSCAD (www.openscad.org)
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* Copyright (C) 2009-2011 Clifford Wolf <clifford@clifford.at> and
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* Marius Kintel <marius@kintel.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* As a special exception, you have permission to link this program
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* with the CGAL library and distribute executables, as long as you
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* follow the requirements of the GNU GPL in regard to all of the
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* software in the executable aside from CGAL.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "export.h"
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#include "printutils.h"
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#include "polyset.h"
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#include "dxfdata.h"
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#include <boost/foreach.hpp>
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#ifdef ENABLE_CGAL
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#include "CGAL_Nef_polyhedron.h"
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#include "cgal.h"
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void exportFile(const class Geometry *root_geom, std::ostream &output, FileFormat format)
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{
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if (const CGAL_Nef_polyhedron *N = dynamic_cast<const CGAL_Nef_polyhedron *>(root_geom)) {
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switch (format) {
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case OPENSCAD_STL:
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export_stl(N, output);
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break;
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case OPENSCAD_OFF:
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export_off(N, output);
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break;
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case OPENSCAD_DXF:
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export_dxf(N, output);
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break;
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default:
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assert(false && "Unknown file format");
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}
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}
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else {
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if (const PolySet *ps = dynamic_cast<const PolySet *>(root_geom)) {
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switch (format) {
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case OPENSCAD_STL:
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export_stl(ps, output);
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break;
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default:
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assert(false && "Unsupported file format");
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}
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}
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else {
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assert(false && "Not implemented");
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}
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}
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}
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void export_stl(const PolySet *ps, std::ostream &output)
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{
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setlocale(LC_NUMERIC, "C"); // Ensure radix is . (not ,) in output
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output << "solid OpenSCAD_Model\n";
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BOOST_FOREACH(const PolySet::Polygon &p, ps->polygons) {
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output << " facet normal 0 0 0\n";
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output << " outer loop\n";
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BOOST_FOREACH(const Vector3d &v, p) {
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output << "vertex" << v[0] << " " << v[1] << " " << v[2] << "\n";
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}
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output << " endloop\n";
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output << " endfacet\n";
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}
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output << "endsolid OpenSCAD_Model\n";
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setlocale(LC_NUMERIC, ""); // Set default locale
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}
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/*!
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Saves the current 3D CGAL Nef polyhedron as STL to the given file.
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The file must be open.
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*/
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void export_stl(const CGAL_Nef_polyhedron *root_N, std::ostream &output)
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{
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if (!root_N->p3->is_simple()) {
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PRINT("Object isn't a valid 2-manifold! Modify your design.\n");
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}
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CGAL::Failure_behaviour old_behaviour = CGAL::set_error_behaviour(CGAL::THROW_EXCEPTION);
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try {
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CGAL_Polyhedron P;
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//root_N->p3->convert_to_Polyhedron(P);
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bool err = nefworkaround::convert_to_Polyhedron<CGAL_Kernel3>( *(root_N->p3), P );
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if (err) {
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PRINT("ERROR: CGAL NefPolyhedron->Polyhedron conversion failed");
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return;
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}
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typedef CGAL_Polyhedron::Vertex Vertex;
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typedef CGAL_Polyhedron::Vertex_const_iterator VCI;
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typedef CGAL_Polyhedron::Facet_const_iterator FCI;
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typedef CGAL_Polyhedron::Halfedge_around_facet_const_circulator HFCC;
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setlocale(LC_NUMERIC, "C"); // Ensure radix is . (not ,) in output
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output << "solid OpenSCAD_Model\n";
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for (FCI fi = P.facets_begin(); fi != P.facets_end(); ++fi) {
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HFCC hc = fi->facet_begin();
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HFCC hc_end = hc;
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Vertex v1, v2, v3;
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v1 = *VCI((hc++)->vertex());
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v3 = *VCI((hc++)->vertex());
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do {
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v2 = v3;
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v3 = *VCI((hc++)->vertex());
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double x1 = CGAL::to_double(v1.point().x());
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double y1 = CGAL::to_double(v1.point().y());
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double z1 = CGAL::to_double(v1.point().z());
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double x2 = CGAL::to_double(v2.point().x());
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double y2 = CGAL::to_double(v2.point().y());
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double z2 = CGAL::to_double(v2.point().z());
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double x3 = CGAL::to_double(v3.point().x());
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double y3 = CGAL::to_double(v3.point().y());
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double z3 = CGAL::to_double(v3.point().z());
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std::stringstream stream;
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stream << x1 << " " << y1 << " " << z1;
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std::string vs1 = stream.str();
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stream.str("");
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stream << x2 << " " << y2 << " " << z2;
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std::string vs2 = stream.str();
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stream.str("");
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stream << x3 << " " << y3 << " " << z3;
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std::string vs3 = stream.str();
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if (vs1 != vs2 && vs1 != vs3 && vs2 != vs3) {
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// The above condition ensures that there are 3 distinct vertices, but
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// they may be collinear. If they are, the unit normal is meaningless
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// so the default value of "1 0 0" can be used. If the vertices are not
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// collinear then the unit normal must be calculated from the
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// components.
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if (!CGAL::collinear(v1.point(),v2.point(),v3.point())) {
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CGAL_Polyhedron::Traits::Vector_3 normal = CGAL::normal(v1.point(),v2.point(),v3.point());
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output << " facet normal "
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<< CGAL::sign(normal.x()) * sqrt(CGAL::to_double(normal.x()*normal.x()/normal.squared_length()))
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<< " "
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<< CGAL::sign(normal.y()) * sqrt(CGAL::to_double(normal.y()*normal.y()/normal.squared_length()))
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<< " "
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<< CGAL::sign(normal.z()) * sqrt(CGAL::to_double(normal.z()*normal.z()/normal.squared_length()))
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<< "\n";
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}
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else output << " facet normal 1 0 0\n";
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output << " outer loop\n";
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output << " vertex " << vs1 << "\n";
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output << " vertex " << vs2 << "\n";
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output << " vertex " << vs3 << "\n";
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output << " endloop\n";
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output << " endfacet\n";
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}
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} while (hc != hc_end);
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}
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output << "endsolid OpenSCAD_Model\n";
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setlocale(LC_NUMERIC, ""); // Set default locale
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}
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catch (const CGAL::Assertion_exception &e) {
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PRINTB("CGAL error in CGAL_Nef_polyhedron3::convert_to_Polyhedron(): %s", e.what());
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}
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catch (...) {
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PRINT("CGAL unknown error in CGAL_Nef_polyhedron3::convert_to_Polyhedron()");
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}
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CGAL::set_error_behaviour(old_behaviour);
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}
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void export_off(const CGAL_Nef_polyhedron *root_N, std::ostream &output)
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{
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if (!root_N->p3->is_simple()) {
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PRINT("Object isn't a valid 2-manifold! Modify your design.\n");
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}
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CGAL::Failure_behaviour old_behaviour = CGAL::set_error_behaviour(CGAL::THROW_EXCEPTION);
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try {
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CGAL_Polyhedron P;
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root_N->p3->convert_to_Polyhedron(P);
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output << P;
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}
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catch (const CGAL::Assertion_exception &e) {
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PRINTB("CGAL error in CGAL_Nef_polyhedron3::convert_to_Polyhedron(): %s", e.what());
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}
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CGAL::set_error_behaviour(old_behaviour);
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}
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/*!
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Saves the current 2D CGAL Nef polyhedron as DXF to the given absolute filename.
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*/
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void export_dxf(const CGAL_Nef_polyhedron *root_N, std::ostream &output)
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{
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setlocale(LC_NUMERIC, "C"); // Ensure radix is . (not ,) in output
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// Some importers (e.g. Inkscape) needs a BLOCKS section to be present
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output << " 0\n"
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<< "SECTION\n"
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<< " 2\n"
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<< "BLOCKS\n"
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<< " 0\n"
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<< "ENDSEC\n"
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<< " 0\n"
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<< "SECTION\n"
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<< " 2\n"
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<< "ENTITIES\n";
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DxfData *dd =root_N->convertToDxfData();
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for (size_t i=0; i<dd->paths.size(); i++)
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{
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for (size_t j=1; j<dd->paths[i].indices.size(); j++) {
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const Vector2d &p1 = dd->points[dd->paths[i].indices[j-1]];
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const Vector2d &p2 = dd->points[dd->paths[i].indices[j]];
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double x1 = p1[0];
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double y1 = p1[1];
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double x2 = p2[0];
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double y2 = p2[1];
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output << " 0\n"
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<< "LINE\n";
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// Some importers (e.g. Inkscape) needs a layer to be specified
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output << " 8\n"
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<< "0\n"
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<< " 10\n"
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<< x1 << "\n"
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<< " 11\n"
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<< x2 << "\n"
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<< " 20\n"
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<< y1 << "\n"
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<< " 21\n"
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<< y2 << "\n";
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}
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}
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output << " 0\n"
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<< "ENDSEC\n";
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// Some importers (e.g. Inkscape) needs an OBJECTS section with a DICTIONARY entry
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output << " 0\n"
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<< "SECTION\n"
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<< " 2\n"
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<< "OBJECTS\n"
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<< " 0\n"
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<< "DICTIONARY\n"
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<< " 0\n"
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<< "ENDSEC\n";
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output << " 0\n"
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<<"EOF\n";
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delete dd;
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setlocale(LC_NUMERIC, ""); // Set default locale
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}
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#endif // ENABLE_CGAL
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#ifdef DEBUG
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#include <boost/foreach.hpp>
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void export_stl(const PolySet &ps, std::ostream &output)
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{
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output << "solid OpenSCAD_PolySet\n";
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BOOST_FOREACH(const PolySet::Polygon &p, ps.polygons) {
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output << "facet\n";
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output << "outer loop\n";
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BOOST_FOREACH(const Vector3d &v, p) {
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output << "vertex " << v[0] << " " << v[1] << " " << v[2] << "\n";
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}
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output << "endloop\n";
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output << "endfacet\n";
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}
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output << "endsolid OpenSCAD_PolySet\n";
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}
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#endif
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