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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// Latitudinal to rectangular coordinates
///
/// Convert from latitudinal coordinates to rectangular coordinates.
///
/// # Brief I/O
///
/// ```text
/// VARIABLE I/O DESCRIPTION
/// -------- --- --------------------------------------------------
/// RADIUS I Distance of a point from the origin.
/// LON I Longitude of point in radians.
/// LAT I Latitude of point in radians.
/// RECTAN O Rectangular coordinates of the point.
/// ```
///
/// # Detailed Input
///
/// ```text
/// RADIUS is the distance of a point from the origin.
///
/// LON is the Longitude of the input point. This is the
/// angle between the prime meridian and the meridian
/// containing the point. The direction of increasing
/// longitude is from the +X axis towards the +Y axis.
///
/// Longitude is measured in radians. On input, the
/// range of longitude is unrestricted.
///
/// LAT is the latitude of the input point. This is the angle
/// from the XY plane of the ray from the origin through
/// the point.
///
/// Latitude is measured in radians. On input, the range
/// of latitude is unrestricted.
/// ```
///
/// # Detailed Output
///
/// ```text
/// RECTAN are the rectangular coordinates of the input point.
/// RECTAN is a 3-vector.
///
/// The units associated with RECTAN are those
/// associated with the input RADIUS.
/// ```
///
/// # Exceptions
///
/// ```text
/// Error free.
/// ```
///
/// # Particulars
///
/// ```text
/// This routine returns the rectangular coordinates of a point
/// whose position is input in latitudinal coordinates.
///
/// Latitudinal coordinates are defined by a distance from a central
/// reference point, an angle from a reference meridian, and an angle
/// above the equator of a sphere centered at the central reference
/// point.
/// ```
///
/// # Examples
///
/// ```text
/// The numerical results shown for these examples may differ across
/// platforms. The results depend on the SPICE kernels used as
/// input, the compiler and supporting libraries, and the machine
/// specific arithmetic implementation.
///
/// 1) Compute the latitudinal coordinates of the position of the
/// Moon as seen from the Earth, and convert them to rectangular
/// coordinates.
///
/// Use the meta-kernel shown below to load the required SPICE
/// kernels.
///
///
/// KPL/MK
///
/// File name: latrec_ex1.tm
///
/// This meta-kernel is intended to support operation of SPICE
/// example programs. The kernels shown here should not be
/// assumed to contain adequate or correct versions of data
/// required by SPICE-based user applications.
///
/// In order for an application to use this meta-kernel, the
/// kernels referenced here must be present in the user's
/// current working directory.
///
/// The names and contents of the kernels referenced
/// by this meta-kernel are as follows:
///
/// File name Contents
/// --------- --------
/// de421.bsp Planetary ephemeris
/// naif0012.tls Leapseconds
///
///
/// \begindata
///
/// KERNELS_TO_LOAD = ( 'de421.bsp',
/// 'naif0012.tls' )
///
/// \begintext
///
/// End of meta-kernel
///
///
/// Example code begins here.
///
///
/// PROGRAM LATREC_EX1
/// IMPLICIT NONE
///
/// C
/// C SPICELIB functions
/// C
/// DOUBLE PRECISION DPR
///
/// C
/// C Local parameters
/// C
/// CHARACTER*(*) FMT1
/// PARAMETER ( FMT1 = '(A,F20.8)' )
///
/// C
/// C Local variables
/// C
/// DOUBLE PRECISION ET
/// DOUBLE PRECISION LAT
/// DOUBLE PRECISION LON
/// DOUBLE PRECISION LT
/// DOUBLE PRECISION POS ( 3 )
/// DOUBLE PRECISION RADIUS
/// DOUBLE PRECISION RECTAN ( 3 )
///
/// C
/// C Load SPK and LSK kernels, use a meta kernel for
/// C convenience.
/// C
/// CALL FURNSH ( 'latrec_ex1.tm' )
///
/// C
/// C Look up the geometric state of the Moon as seen from
/// C the Earth at 2017 Mar 20, relative to the J2000
/// C reference frame.
/// C
/// CALL STR2ET ( '2017 Mar 20', ET )
///
/// CALL SPKPOS ( 'Moon', ET, 'J2000', 'NONE',
/// . 'Earth', POS, LT )
///
/// C
/// C Convert the position vector POS to latitudinal
/// C coordinates.
/// C
/// CALL RECLAT ( POS, RADIUS, LON, LAT )
///
/// C
/// C Convert the latitudinal to rectangular coordinates.
/// C
///
/// CALL LATREC ( RADIUS, LON, LAT, RECTAN )
///
/// WRITE(*,*) ' '
/// WRITE(*,*) 'Original rectangular coordinates:'
/// WRITE(*,*) ' '
/// WRITE(*,FMT1) ' X (km): ', POS(1)
/// WRITE(*,FMT1) ' Y (km): ', POS(2)
/// WRITE(*,FMT1) ' Z (km): ', POS(3)
/// WRITE(*,*) ' '
/// WRITE(*,*) 'Latitudinal coordinates:'
/// WRITE(*,*) ' '
/// WRITE(*,FMT1) ' Radius (km): ', RADIUS
/// WRITE(*,FMT1) ' Longitude (deg): ', LON*DPR()
/// WRITE(*,FMT1) ' Latitude (deg): ', LAT*DPR()
/// WRITE(*,*) ' '
/// WRITE(*,*) 'Rectangular coordinates from LATREC:'
/// WRITE(*,*) ' '
/// WRITE(*,FMT1) ' X (km): ', RECTAN(1)
/// WRITE(*,FMT1) ' Y (km): ', RECTAN(2)
/// WRITE(*,FMT1) ' Z (km): ', RECTAN(3)
/// WRITE(*,*) ' '
///
/// END
///
///
/// When this program was executed on a Mac/Intel/gfortran/64-bit
/// platform, the output was:
///
///
/// Original rectangular coordinates:
///
/// X (km): -55658.44323296
/// Y (km): -379226.32931475
/// Z (km): -126505.93063865
///
/// Latitudinal coordinates:
///
/// Radius (km): 403626.33912495
/// Longitude (deg): -98.34959789
/// Latitude (deg): -18.26566077
///
/// Rectangular coordinates from LATREC:
///
/// X (km): -55658.44323296
/// Y (km): -379226.32931475
/// Z (km): -126505.93063865
///
///
/// 2) Create a table showing a variety of latitudinal coordinates
/// and the corresponding rectangular coordinates.
///
/// Corresponding latitudinal and rectangular coordinates are
/// listed to three decimal places. Input angles are in degrees.
///
///
/// Example code begins here.
///
///
/// PROGRAM LATREC_EX2
/// IMPLICIT NONE
///
/// C
/// C SPICELIB functions
/// C
/// DOUBLE PRECISION DPR
/// DOUBLE PRECISION RPD
///
/// C
/// C Local parameters.
/// C
/// INTEGER NREC
/// PARAMETER ( NREC = 11 )
///
/// C
/// C Local variables.
/// C
/// DOUBLE PRECISION LAT ( NREC )
/// DOUBLE PRECISION LON ( NREC )
/// DOUBLE PRECISION RADIUS ( NREC )
/// DOUBLE PRECISION RECTAN ( 3 )
/// DOUBLE PRECISION RLAT
/// DOUBLE PRECISION RLON
///
/// INTEGER I
///
/// C
/// C Define the input latitudinal coordinates. Angles in
/// C degrees.
/// C
///
/// DATA RADIUS / 0.D0, 1.D0, 1.D0,
/// . 1.D0, 1.D0, 1.D0,
/// . 1.D0, 1.4142D0, 1.4142D0,
/// . 1.4142D0, 1.732D0 /
///
/// DATA LON / 0.D0, 0.D0, 90.D0,
/// . 0.D0, 180.D0, -90.D0,
/// . 0.D0, 45.D0, 0.D0,
/// . 90.D0, 45.D0 /
///
/// DATA LAT / 0.D0, 0.D0, 0.D0,
/// . 90.D0, 0.D0, 0.D0,
/// . -90.D0, 0.D0, 45.D0,
/// . 45.D0, 35.264D0 /
///
/// C
/// C Print the banner.
/// C
/// WRITE(*,*) ' RADIUS LON LAT '
/// . // ' RECT(1) RECT(2) RECT(3) '
/// WRITE(*,*) ' ------- ------- ------- '
/// . // ' ------- ------- ------- '
///
/// C
/// C Do the conversion.
/// C
/// DO I = 1, NREC
///
/// RLON = LON(I) * RPD()
/// RLAT = LAT(I) * RPD()
///
/// CALL LATREC( RADIUS(I), RLON, RLAT, RECTAN )
///
/// WRITE (*,'(6F9.3)') RADIUS(I), LON(I), LAT(I),
/// . RECTAN
///
/// END DO
///
/// END
///
///
/// When this program was executed on a Mac/Intel/gfortran/64-bit
/// platform, the output was:
///
///
/// RADIUS LON LAT RECT(1) RECT(2) RECT(3)
/// ------- ------- ------- ------- ------- -------
/// 0.000 0.000 0.000 0.000 0.000 0.000
/// 1.000 0.000 0.000 1.000 0.000 0.000
/// 1.000 90.000 0.000 0.000 1.000 0.000
/// 1.000 0.000 90.000 0.000 0.000 1.000
/// 1.000 180.000 0.000 -1.000 0.000 0.000
/// 1.000 -90.000 0.000 0.000 -1.000 0.000
/// 1.000 0.000 -90.000 0.000 0.000 -1.000
/// 1.414 45.000 0.000 1.000 1.000 0.000
/// 1.414 0.000 45.000 1.000 0.000 1.000
/// 1.414 90.000 45.000 0.000 1.000 1.000
/// 1.732 45.000 35.264 1.000 1.000 1.000
/// ```
///
/// # Author and Institution
///
/// ```text
/// C.H. Acton (JPL)
/// N.J. Bachman (JPL)
/// J. Diaz del Rio (ODC Space)
/// W.L. Taber (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.1.0, 06-JUL-2021 (JDR)
///
/// Changed the input argument name LONG to LON for consistency
/// with other routines.
///
/// Added IMPLICIT NONE statement.
///
/// Edited the header to comply with NAIF standard. Removed
/// unnecessary $Revisions section.
///
/// Added complete code examples.
///
/// - SPICELIB Version 1.0.2, 29-JUL-2003 (NJB) (CHA)
///
/// Various header changes were made to improve clarity. Some
/// minor header corrections were made.
///
/// - SPICELIB Version 1.0.1, 10-MAR-1992 (WLT)
///
/// Comment section for permuted index source lines was added
/// following the header.
///
/// - SPICELIB Version 1.0.0, 31-JAN-1990 (WLT)
/// ```
pub fn latrec(radius: f64, lon: f64, lat: f64, rectan: &mut [f64; 3]) {
LATREC(radius, lon, lat, rectan);
}
//$Procedure LATREC ( Latitudinal to rectangular coordinates )
pub fn LATREC(RADIUS: f64, LON: f64, LAT: f64, RECTAN: &mut [f64]) {
let mut RECTAN = DummyArrayMut::new(RECTAN, 1..=3);
let mut X: f64 = 0.0;
let mut Y: f64 = 0.0;
let mut Z: f64 = 0.0;
//
// Local variables
//
//
// Convert to rectangular coordinates, storing the results in
// temporary variables.
//
X = ((RADIUS * f64::cos(LON)) * f64::cos(LAT));
Y = ((RADIUS * f64::sin(LON)) * f64::cos(LAT));
Z = (RADIUS * f64::sin(LAT));
//
// Move the results to the output variables.
//
RECTAN[1] = X;
RECTAN[2] = Y;
RECTAN[3] = Z;
}