Clifford Wolf:

	Little progress with 2d minkowski code



git-svn-id: http://svn.clifford.at/openscad/trunk@480 b57f626f-c46c-0410-a088-ec61d464b74c

1 files changed, 96 insertions, 0 deletions

diff --git a/src/cgaladv_minkowski2.cc b/src/cgaladv_minkowski2.cc
new file mode 100644
index 0000000..85a0b2b
--- /dev/null
+++ b/src/cgaladv_minkowski2.cc
@@ -0,0 +1,96 @@
+/*
+ *  OpenSCAD (www.openscad.at)
+ *  Copyright (C) 2009  Clifford Wolf <clifford@clifford.at>
+ *
+ *  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.
+ *
+ *  As a special exception, you have permission to link this program
+ *  with the CGAL library and distribute executables, as long as you
+ *  follow the requirements of the GNU GPL in regard to all of the
+ *  software in the executable aside from CGAL.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifdef ENABLE_CGAL
+
+#include "node.h"
+#include "printutils.h"
+#include "grid.h"
+#include "cgal.h"
+
+#if 0
+
+#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
+#include <CGAL/minkowski_sum_2.h>
+
+extern CGAL_Nef_polyhedron2 minkowski2(CGAL_Nef_polyhedron2 a, CGAL_Nef_polyhedron2 b);
+
+struct K2 : public CGAL::Exact_predicates_exact_constructions_kernel {};
+typedef CGAL::Polygon_2<K2> Poly2;
+typedef CGAL::Polygon_with_holes_2<K2> Poly2h;
+
+static Poly2 nef2p2(CGAL_Nef_polyhedron2 p)
+{
+	std::list<K2::Point_2> points;
+	Grid2d<int> grid(GRID_COARSE);
+
+	typedef CGAL_Nef_polyhedron2::Explorer Explorer;
+	typedef Explorer::Face_const_iterator fci_t;
+	typedef Explorer::Halfedge_around_face_const_circulator heafcc_t;
+	Explorer E = p.explorer();
+
+	for (fci_t fit = E.faces_begin(), fend = E.faces_end(); fit != fend; ++fit)
+	{
+		if (fit != E.faces_begin()) {
+			PRINT("WARNING: minkowski() is not implemented for 2d objects with holes!");
+			break;
+		}
+
+		heafcc_t fcirc(E.halfedge(fit)), fend(fcirc);
+		CGAL_For_all(fcirc, fend) {
+			if (E.is_standard(E.target(fcirc))) {
+				Explorer::Point ep = E.point(E.target(fcirc));
+				double x = to_double(ep.x()), y = to_double(ep.y());
+				grid.align(x, y);
+				points.push_back(K2::Point_2(x, y));
+			}
+		}
+	}
+
+	return Poly2(points.begin(), points.end());
+}
+
+CGAL_Nef_polyhedron2 minkowski2(CGAL_Nef_polyhedron2 a, CGAL_Nef_polyhedron2 b)
+{
+	Poly2 ap = nef2p2(a), bp = nef2p2(b);
+	Poly2h x = minkowski_sum_2(ap, bp);
+	/** FIXME **/
+	
+	PRINT("WARNING: minkowski() is not implemented yet for 2d objects!");
+	return CGAL_Nef_polyhedron2();
+}
+
+#else
+
+CGAL_Nef_polyhedron2 minkowski2(CGAL_Nef_polyhedron2, CGAL_Nef_polyhedron2)
+{
+	PRINT("WARNING: minkowski() is not implemented yet for 2d objects!");
+	return CGAL_Nef_polyhedron2();
+}
+
+#endif
+
+#endif
+