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author | px4dev <px4@purgatory.org> | 2013-01-11 02:14:43 -0800 |
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committer | px4dev <px4@purgatory.org> | 2013-01-11 02:14:43 -0800 |
commit | f127495caa2d45a1b1fff3be7a9d3756259d23e2 (patch) | |
tree | 91daf599eae326f2207d0fbd9ede34b51eca1812 /nuttx/libc/math/lib_atan2f.c | |
parent | 48c5d63319be3b8da7c4cd598d2a31dceae842a7 (diff) | |
download | px4-firmware-f127495caa2d45a1b1fff3be7a9d3756259d23e2.tar.gz px4-firmware-f127495caa2d45a1b1fff3be7a9d3756259d23e2.tar.bz2 px4-firmware-f127495caa2d45a1b1fff3be7a9d3756259d23e2.zip |
Manually fixup merge botches via direct comparison with NuttX r5447.
Diffstat (limited to 'nuttx/libc/math/lib_atan2f.c')
-rw-r--r-- | nuttx/libc/math/lib_atan2f.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/nuttx/libc/math/lib_atan2f.c b/nuttx/libc/math/lib_atan2f.c new file mode 100644 index 000000000..7ff9af130 --- /dev/null +++ b/nuttx/libc/math/lib_atan2f.c @@ -0,0 +1,81 @@ +/************************************************************************ + * libc/math/lib_atan2f.c + * + * This file is a part of NuttX: + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Ported by: Darcy Gong + * + * It derives from the Rhombs OS math library by Nick Johnson which has + * a compatibile, MIT-style license: + * + * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + ************************************************************************/ + +/************************************************************************ + * Included Files + ************************************************************************/ + +#include <math.h> + +/************************************************************************ + * Public Functions + ************************************************************************/ + +float atan2f(float y, float x) +{ + if (y == 0.0) + { + if (x >= 0.0) + { + return 0.0; + } + else + { + return M_PI; + } + } + else if (y > 0.0) + { + if (x == 0.0) + { + return M_PI_2; + } + else if (x > 0.0) + { + return atanf(y / x); + } + else + { + return M_PI - atanf(y / x); + } + } + else + { + if (x == 0.0) + { + return M_PI + M_PI_2; + } + else if (x > 0.0) + { + return 2 * M_PI - atanf(y / x); + } + else + { + return M_PI + atanf(y / x); + } + } +} |