codewars/c/static_lib/3d.c

#include <math.h>

#include "geometry.h"

cartesian_pos_3d_t convert_to_3d_cartesian_pos(
        const polar_pos_3d_t* polar_pos) {
    cartesian_pos_3d_t result;
    result.x = polar_pos->length *
        sin_deg(polar_pos->theta) * cos_deg(polar_pos->phi);
    result.y = polar_pos->length *
        sin_deg(polar_pos->theta) * sin_deg(polar_pos->phi);
    result.z = polar_pos->length * cos_deg(polar_pos->theta);
    return result;
}

polar_pos_3d_t convert_to_3d_polar_pos(
        const cartesian_pos_3d_t* cartesian_pos) {
    polar_pos_3d_t result;
    result.length = sqrt(cartesian_pos->x * cartesian_pos->x +
            cartesian_pos->y * cartesian_pos->y +
            cartesian_pos->z * cartesian_pos->z);
    result.theta = to_degree(acos(cartesian_pos->z / result.length));
    result.phi = to_degree(atan(cartesian_pos->y / cartesian_pos->x));
    return result;
}