/*
- Copyright (C) 2010 Paul Davis
+ * Copyright (C) 2010-2015 Paul Davis <paul@linuxaudiosystems.com>
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
- 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 <math.h>
#include "pbd/cartesian.h"
using namespace std;
void
-PBD::azi_ele_to_cart (double azi, double ele, double& x, double& y, double& z)
+PBD::spherical_to_cartesian (double azi, double ele, double len, double& x, double& y, double& z)
{
/* convert from cylindrical coordinates in degrees to cartesian */
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);
+ if (len == 0.0) {
+ len = 1.0;
+ }
+
+ x = len * cos (azi * atorad) * cos (ele * atorad);
+ y = len * sin (azi * atorad) * cos (ele * atorad);
+ z = len * sin (ele * atorad);
}
-void
-PBD::cart_to_azi_ele (double x, double y, double z, double& azimuth, double& elevation)
+void
+PBD::cartesian_to_spherical (double x, double y, double z, double& azimuth, double& elevation, double& length)
{
/* converts cartesian coordinates to cylindrical in degrees*/
- 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 = atan2 (y,x);
- }
-
- if (y < 0.0) {
- /* below x-axis: atan2 returns 0 .. -PI (negative) so convert to degrees and ADD to 180 */
- azimuth = 180.0 + (atan_y_per_x / (M_PI/180.0) + 180.0);
- } else {
- /* above x-axis: atan2 returns 0 .. +PI so convert to degrees */
- azimuth = atan_y_per_x / atorad;
- }
-
- 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 = atan2 (z,distance);
- }
-
- if (distance == 0.0) {
- if (z < 0.0) {
- atan_x_pl_y_per_z = -M_PI/2.0;
- } else if (z > 0.0) {
- atan_x_pl_y_per_z = M_PI/2.0;
- }
- }
-
- elevation = atan_x_pl_y_per_z / atorad;
-
- // distance = sqrtf (x*x + y*y + z*z);
+ double rho, theta, phi;
+
+ rho = sqrt (x*x + y*y + z*z);
+ //phi = acos (1.0 / rho);
+ theta = atan2 (y, x);
+
+ /* XXX for now, clamp phi to zero */
+
+ phi = 0.0;
+
+ if (theta < 0.0) {
+ azimuth = 180.0 - (180.0 * (theta / M_PI)); /* LHS is negative */
+ } else {
+ azimuth = 180.0 * (theta / M_PI);
+ }
+
+ if (phi < 0.0) {
+ elevation = 180.0 - (180.0 * (phi / M_PI)); /* LHS is negative */
+ } else {
+ elevation = 180.0 * (phi / M_PI);
+ }
+
+ length = rho;
}