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/*
* Copyright (C) 2009, 2010 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.
*/
#include <apps/math.h>
#include <float.h>
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);
}
}
}
double atan2(double y, double 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 atan(y / x);
}
else {
return M_PI - atan(y / x);
}
}
else {
if (x == 0.0) {
return M_PI + M_PI_2;
}
else if (x > 0.0) {
return 2 * M_PI - atan(y / x);
}
else {
return M_PI + atan(y / x);
}
}
}
long double atan2l(long double y, long double 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 atanl(y / x);
}
else {
return M_PI - atanl(y / x);
}
}
else {
if (x == 0.0) {
return M_PI + M_PI_2;
}
else if (x > 0.0) {
return 2 * M_PI - atanl(y / x);
}
else {
return M_PI + atanl(y / x);
}
}
}
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