72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
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/*
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Copyright (C) 2010 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <cmath>
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#include "pbd/cartesian.h"
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void
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PBD::azi_ele_to_cart (double azi, double ele, double& x, double& y, double& z)
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{
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static const double atorad = 2.0 * M_PI / 360.0 ;
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x = cos (azi * atorad) * cos (ele * atorad);
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y = sin (azi * atorad) * cos (ele * atorad);
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z = sin (ele * atorad);
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}
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void
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PBD::cart_to_azi_ele (double x, double y, double z, double& azimuth, double& elevation)
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{
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/* converts cartesian coordinates to angular */
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const double atorad = 2.0 * M_PI / 360.0;
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double atan_y_per_x, atan_x_pl_y_per_z;
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double distance;
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if(x == 0.0) {
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atan_y_per_x = M_PI / 2;
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} else {
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atan_y_per_x = atan(y / x);
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}
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azimuth = atan_y_per_x / atorad;
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if (x < 0.0) {
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azimuth +=180.0;
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}
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distance = sqrt (x*x + y*y);
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if (z == 0.0) {
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atan_x_pl_y_per_z = 0.0;
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} else {
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atan_x_pl_y_per_z = atan (z/distance);
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}
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if (distance == 0.0) {
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if (z < 0.0) {
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atan_x_pl_y_per_z = -M_PI/2.0;
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} else {
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atan_x_pl_y_per_z = M_PI/2.0;
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}
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}
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elevation = atan_x_pl_y_per_z / atorad;
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// distance = sqrtf (x*x + y*y + z*z);
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}
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