Paul Davis
5ad82b1e6d
git-svn-id: svn://localhost/ardour2/branches/3.0@8952 d708f5d6-7413-0410-9779-e7cbd77b26cf
114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
/*
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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 <iostream>
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#include <math.h>
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#include "pbd/cartesian.h"
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using namespace std;
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void
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PBD::spherical_to_cartesian (double azi, double ele, double len, double& x, double& y, double& z)
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{
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/* convert from cylindrical coordinates in degrees to cartesian */
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static const double atorad = 2.0 * M_PI / 360.0 ;
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if (len == 0.0) {
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len = 1.0;
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}
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x = len * cos (azi * atorad) * cos (ele * atorad);
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y = len * sin (azi * atorad) * cos (ele * atorad);
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z = len * sin (ele * atorad);
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}
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void
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PBD::cartesian_to_spherical (double x, double y, double z, double& azimuth, double& elevation, double& length)
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{
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#if 1
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/* converts cartesian coordinates to cylindrical in degrees*/
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double rho, theta, phi;
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rho = sqrt (x*x + y*y + z*z);
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phi = acos (1.0/rho);
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theta = atan2 (y, x);
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/* XXX for now, clamp phi to zero */
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phi = 0.0;
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if (theta < 0.0) {
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azimuth = 180.0 - (180.0 * (theta / M_PI)); /* LHS is negative */
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} else {
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azimuth = 180.0 * (theta / M_PI);
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}
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if (phi < 0.0) {
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elevation = 180.0 - (180.0 * (phi / M_PI)); /* LHS is negative */
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} else {
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elevation = 180.0 * (phi / M_PI);
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}
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length = rho;
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#else
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/* converts cartesian coordinates to cylindrical in degrees*/
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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 = atan2 (y,x);
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}
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if (y < 0.0) {
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/* below x-axis: atan2 returns 0 .. -PI (negative) so convert to degrees and ADD to 180 */
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azimuth = 180.0 + (atan_y_per_x / (M_PI/180.0) + 180.0);
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} else {
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/* above x-axis: atan2 returns 0 .. +PI so convert to degrees */
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azimuth = atan_y_per_x / atorad;
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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 = atan2 (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 if (z > 0.0) {
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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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#endif
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}
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