mirror of https://github.com/vitalif/openscad
41 lines
1.5 KiB
C++
41 lines
1.5 KiB
C++
/*
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* OpenSCAD (www.openscad.org)
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* Copyright (C) 2009-2011 Clifford Wolf <clifford@clifford.at> and
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* Marius Kintel <marius@kintel.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* As a special exception, you have permission to link this program
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* with the CGAL library and distribute executables, as long as you
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* follow the requirements of the GNU GPL in regard to all of the
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* software in the executable aside from CGAL.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "calc.h"
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#include "grid.h"
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/*!
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Returns the number of subdivision of a whole circle, given radius and
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the three special variables $fn, $fs and $fa
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*/
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int Calc::get_fragments_from_r(double r, double fn, double fs, double fa)
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{
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if (r < GRID_FINE) return 3;
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if (fn > 0.0) return (int)(fn >= 3 ? fn : 3);
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return (int)ceil(fmax(fmin(360.0 / fa, r*2*M_PI / fs), 5));
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}
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