move transform from CGALEvaluator to Nef_polyhedron - reuse in resize(). also

move ZRemover code to cgalutils, also cleanup SVG code

1 files changed, 51 insertions, 0 deletions

diff --git a/src/cgalutils.cc b/src/cgalutils.cc
index 66d4b18..8b4c476 100644
--- a/src/cgalutils.cc
+++ b/src/cgalutils.cc
@@ -173,5 +173,56 @@ CGAL_Iso_rectangle_2e bounding_box( const CGAL_Nef_polyhedron2 &N )
 	return result;
 }
 
+void ZRemover::visit( CGAL_Nef_polyhedron3::Halffacet_const_handle hfacet )
+{
+	log << " <!-- ZRemover Halffacet visit. Mark: " << hfacet->mark() << " -->\n";
+	if ( hfacet->plane().orthogonal_direction() != this->up ) {
+		log << "  <!-- ZRemover down-facing half-facet. skipping -->\n";
+		log << " <!-- ZRemover Halffacet visit end-->\n";
+		return;
+	}
+
+	// possible optimization - throw out facets that are vertically oriented
+
+	CGAL_Nef_polyhedron3::Halffacet_cycle_const_iterator fci;
+	int contour_counter = 0;
+	CGAL_forall_facet_cycles_of( fci, hfacet ) {
+		if ( fci.is_shalfedge() ) {
+			log << " <!-- ZRemover Halffacet cycle begin -->\n";
+			CGAL_Nef_polyhedron3::SHalfedge_around_facet_const_circulator c1(fci), cend(c1);
+			std::vector<CGAL_Nef_polyhedron2::Explorer::Point> contour;
+			CGAL_For_all( c1, cend ) {
+				CGAL_Nef_polyhedron3::Point_3 point3d = c1->source()->target()->point();
+				CGAL_Nef_polyhedron2::Explorer::Point point2d( point3d.x(), point3d.y() );
+				contour.push_back( point2d );
+			}
+			if (contour.size()==0) continue;
+
+			log << " <!-- is_simple_2:" << CGAL::is_simple_2( contour.begin(), contour.end() ) << " --> \n";
+
+			tmpnef2d.reset( new CGAL_Nef_polyhedron2( contour.begin(), contour.end(), boundary ) );
+
+			if ( contour_counter == 0 ) {
+				log << " <!-- contour is a body. make union(). " << contour.size() << " points. -->\n" ;
+				*(output_nefpoly2d) += *(tmpnef2d);
+			} else {
+				log << " <!-- contour is a hole. make intersection(). " << contour.size() << " points. -->\n";
+				*(output_nefpoly2d) *= *(tmpnef2d);
+			}
+
+			/*log << "\n<!-- ======== output tmp nef: ==== -->\n"
+				<< OpenSCAD::dump_svg( *tmpnef2d ) << "\n"
+				<< "\n<!-- ======== output accumulator: ==== -->\n"
+				<< OpenSCAD::dump_svg( *output_nefpoly2d ) << "\n";*/
+
+			contour_counter++;
+		} else {
+			log << " <!-- ZRemover trivial facet cycle skipped -->\n";
+		}
+		log << " <!-- ZRemover Halffacet cycle end -->\n";
+	}
+	log << " <!-- ZRemover Halffacet visit end -->\n";
+}
+
 #endif /* ENABLE_CGAL */