63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
/* libsegl - Sebas Extended GL Library
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* Collection of Opengl/3D-Math helpers
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*
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* Copyright (c) 2008 by Sebastian Lohff, seba@seba-geek.de
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* http://www.seba-geek.de
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "emath.h"
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namespace segl {
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// Trigonometrische Funktionen
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float deg2rad(float deg) {
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return (deg/180.0f)*3.1415926535897932384626433f;
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}
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float rad2deg(float rad) {
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return (rad/3.1415926535897932384626433f)*180.0f;
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}
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float ssin(float c) {
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int t=(int)c;
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if(t!=c)
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return sin(deg2rad(c));
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t = t % 360;
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if(t<0)
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t = 360 + t;
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switch(t) {
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case 0:
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return 0.0f;
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case 90:
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return 1.0f;
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case 180:
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return 0.0f;
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case 270:
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return -1.0f;
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default:
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return sin(deg2rad(c));
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}
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}
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float scos(float c) {
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return ssin(c+90.0f);
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}
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} // namespace segl
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