1 /* atan2f.c: Computes atan2(x) where x is a 32-bit float.
3 Copyright (C) 2001, 2002 Jesus Calvino-Fraga, jesusc@ieee.org
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
19 /* Version 1.0 - Initial release */
24 float atan2f(const float x, const float y)
28 if ((x==0.0) && (y==0.0))
34 if(fabsf(y)>=fabsf(x))
37 if(y<0.0) r+=(x>=0?PI:-PI);
42 r+=(x<0.0?-HALF_PI:HALF_PI);