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/*
Copyright (C) 2010 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <iostream>
#include <cmath>
#include "pbd/cartesian.h"
void
PBD::azi_ele_to_cart (double azi, double ele, double& x, double& y, double& z)
{
static const double atorad = 2.0 * M_PI / 360.0 ;
x = cos (azi * atorad) * cos (ele * atorad);
y = sin (azi * atorad) * cos (ele * atorad);
z = sin (ele * atorad);
}
void
PBD::cart_to_azi_ele (double x, double y, double z, double& azimuth, double& elevation)
{
/* converts cartesian coordinates to angular */
const double atorad = 2.0 * M_PI / 360.0;
double atan_y_per_x, atan_x_pl_y_per_z;
double distance;
if(x == 0.0) {
atan_y_per_x = M_PI / 2;
} else {
atan_y_per_x = atan (y/x);
}
azimuth = atan_y_per_x / atorad;
if (x < 0.0) {
azimuth += 180.0;
}
distance = sqrt (x*x + y*y);
if (z == 0.0) {
atan_x_pl_y_per_z = 0.0;
} else {
atan_x_pl_y_per_z = atan (z/distance);
}
if (distance == 0.0) {
if (z < 0.0) {
atan_x_pl_y_per_z = -M_PI/2.0;
} else {
atan_x_pl_y_per_z = M_PI/2.0;
}
}
elevation = atan_x_pl_y_per_z / atorad;
std::cerr << x << ", " << y << ", " << z << " = " << azimuth << " /= " << elevation << std::endl;
// distance = sqrtf (x*x + y*y + z*z);
}
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