Merge branch 'master' of github.com:openscad/openscad into colorsfix

1 files changed, 40 insertions, 0 deletions

diff --git a/src/calc.cc b/src/calc.cc
new file mode 100644
index 0000000..bdae085
--- /dev/null
+++ b/src/calc.cc
@@ -0,0 +1,40 @@
+/*
+ *  OpenSCAD (www.openscad.org)
+ *  Copyright (C) 2009-2011 Clifford Wolf <clifford@clifford.at> and
+ *                          Marius Kintel <marius@kintel.net>
+ *
+ *  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
+ *
+ */
+
+#include "calc.h"
+#include "grid.h"
+
+/*!
+	Returns the number of subdivision of a whole circle, given radius and
+	the three special variables $fn, $fs and $fa
+*/
+int Calc::get_fragments_from_r(double r, double fn, double fs, double fa)
+{
+	if (r < GRID_FINE) return 3;
+	if (fn > 0.0) return (int)(fn >= 3 ? fn : 3);
+	return (int)ceil(fmax(fmin(360.0 / fa, r*2*M_PI / fs), 5));
+}
+