add 2d convex hull utility function, BLI_convexhull_2d(), and python api mathutils.geometry.convex_hull_2d()

uses Andrew's monotone chain 2D convex hull algorithm.

1 files changed, 31 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_convexhull2d.h b/source/blender/blenlib/BLI_convexhull2d.h
new file mode 100644
index 00000000000..30de786eb96
--- /dev/null
+++ b/source/blender/blenlib/BLI_convexhull2d.h
@@ -0,0 +1,31 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __BLI_CONVEXHULL2D__
+#define __BLI_CONVEXHULL2D__
+
+/** \file BLI_convexhull2d.h
+ *  \ingroup bli
+ */
+
+int BLI_convexhull_2d_presorted(const float (*points)[2], const int n, int r_points[]);
+int BLI_convexhull_2d(const float (*points)[2], const int n, int r_points[]);
+
+#endif  /* __BLI_CONVEXHULL2D__ */