Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#include <cmath>
+#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)
{
- 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);
+ /* convert from cylindrical coordinates in degrees to cartesian */
+
+ static const double atorad = 2.0 * M_PI / 360.0 ;
+
+ 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 angular */
- const double atorad = 2.0 * M_PI / 360.0;
- double atan_y_per_x, atan_x_pl_y_per_z;
- double distance;
+ /* converts cartesian coordinates to cylindrical in degrees*/
- if(x == 0.0) {
- atan_y_per_x = M_PI / 2;
- } else {
- atan_y_per_x = atan(y / x);
- }
+ double rho, theta, phi;
- azimuth = atan_y_per_x / atorad;
+ rho = sqrt (x*x + y*y + z*z);
+ //phi = acos (1.0 / rho);
+ theta = atan2 (y, x);
- if (x < 0.0) {
- azimuth +=180.0;
- }
+ /* XXX for now, clamp phi to zero */
- distance = sqrt (x*x + y*y);
+ phi = 0.0;
- if (z == 0.0) {
- atan_x_pl_y_per_z = 0.0;
+ if (theta < 0.0) {
+ azimuth = 180.0 - (180.0 * (theta / M_PI)); /* LHS is negative */
} else {
- atan_x_pl_y_per_z = atan (z/distance);
+ azimuth = 180.0 * (theta / M_PI);
}
- 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;
- }
+ if (phi < 0.0) {
+ elevation = 180.0 - (180.0 * (phi / M_PI)); /* LHS is negative */
+ } else {
+ elevation = 180.0 * (phi / M_PI);
}
- elevation = atan_x_pl_y_per_z / atorad;
-
- // distance = sqrtf (x*x + y*y + z*z);
+ length = rho;
}