diff options
Diffstat (limited to 'src/calc.cc')
| -rw-r--r-- | src/calc.cc | 40 |
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)); +} + |