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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// Unitized cross product, 3x3
///
/// Compute the normalized cross product of two 3-vectors.
///
/// # Brief I/O
///
/// ```text
/// VARIABLE I/O DESCRIPTION
/// -------- --- --------------------------------------------------
/// V1 I Left vector for cross product.
/// V2 I Right vector for cross product.
/// VOUT O Normalized cross product of V1 and V2.
/// ```
///
/// # Detailed Input
///
/// ```text
/// V1,
/// V2 are two double precision 3-dimensional vectors.
/// Typically, these might represent the (possibly unit)
/// vector to a planet, Sun, or a star which defines the
/// orientation of axes of some reference frame.
/// ```
///
/// # Detailed Output
///
/// ```text
/// VOUT is the double precision 3-dimensional normalized cross
/// product of V1 and V2. VOUT is the result of the
/// computation
///
/// V1 x V2
/// ---------------
/// || V1 x V2 ||
///
/// where "x" denotes the cross product and ||X||| the norm
/// of a vector X.
/// ```
///
/// # Exceptions
///
/// ```text
/// Error free.
///
/// 1) If the cross product of V1 and V2 yields the zero-vector,
/// then the zero-vector is returned instead of a vector of
/// unit length.
/// ```
///
/// # Examples
///
/// ```text
/// The numerical results shown for this example 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) Define two sets of vectors and compute the normalized cross
/// product of each vector in first set and the corresponding
/// vector in the second set.
///
///
/// Example code begins here.
///
///
/// PROGRAM UCRSS_EX1
/// IMPLICIT NONE
///
/// C
/// C Local parameters.
/// C
/// INTEGER NDIM
/// PARAMETER ( NDIM = 3 )
///
/// INTEGER SETSIZ
/// PARAMETER ( SETSIZ = 2 )
///
/// C
/// C Local variables.
/// C
/// DOUBLE PRECISION V1 ( NDIM, SETSIZ )
/// DOUBLE PRECISION V2 ( NDIM, SETSIZ )
/// DOUBLE PRECISION VOUT ( NDIM )
///
/// INTEGER I
/// INTEGER J
///
/// C
/// C Define the two vector sets.
/// C
/// DATA V1 / 0.D0, 1.D0, 0.D0,
/// . 5.D0, 5.D0, 5.D0 /
///
/// DATA V2 / 3.D0, 0.D0, 0.D0,
/// . -2.D0, -2.D0, -2.D0 /
///
/// C
/// C Calculate the cross product of each pair of vectors
/// C
/// DO I=1, SETSIZ
///
/// CALL UCRSS ( V1(1,I), V2(1,I), VOUT )
///
/// WRITE(*,'(A,3F5.1)') 'Vector A : ',
/// . ( V1(J,I), J=1,3 )
/// WRITE(*,'(A,3F5.1)') 'Vector B : ',
/// . ( V2(J,I), J=1,3 )
/// WRITE(*,'(A,3F5.1)') 'Normalized cross product: ',
/// . VOUT
/// WRITE(*,*) ' '
///
/// END DO
///
/// END
///
///
/// When this program was executed on a Mac/Intel/gfortran/64-bit
/// platform, the output was:
///
///
/// Vector A : 0.0 1.0 0.0
/// Vector B : 3.0 0.0 0.0
/// Normalized cross product: 0.0 0.0 -1.0
///
/// Vector A : 5.0 5.0 5.0
/// Vector B : -2.0 -2.0 -2.0
/// Normalized cross product: 0.0 0.0 0.0
/// ```
///
/// # Author and Institution
///
/// ```text
/// J. Diaz del Rio (ODC Space)
/// W.M. Owen (JPL)
/// W.L. Taber (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.1.0, 06-JUL-2021 (JDR)
///
/// Added IMPLICIT NONE statement.
///
/// Edited the header to comply with NAIF standard. Added complete
/// code example.
///
/// - 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 (WMO) (WLT)
/// ```
///
/// # Revisions
///
/// ```text
/// - Beta Version 1.1.0, 10-JAN-1989 (WLT)
///
/// Error free specification added. In addition the algorithm was
/// made more robust in the sense that floating point overflows
/// cannot occur.
/// ```
pub fn ucrss(v1: &[f64; 3], v2: &[f64; 3], vout: &mut [f64; 3]) {
UCRSS(v1, v2, vout);
}
//$Procedure UCRSS ( Unitized cross product, 3x3 )
pub fn UCRSS(V1: &[f64], V2: &[f64], VOUT: &mut [f64]) {
let V1 = DummyArray::new(V1, 1..=3);
let V2 = DummyArray::new(V2, 1..=3);
let mut VOUT = DummyArrayMut::new(VOUT, 1..=3);
let mut VCROSS = StackArray::<f64, 3>::new(1..=3);
let mut VMAG: f64 = 0.0;
let mut MAXV1: f64 = 0.0;
let mut MAXV2: f64 = 0.0;
let mut TV1 = StackArray::<f64, 3>::new(1..=3);
let mut TV2 = StackArray::<f64, 3>::new(1..=3);
//
// SPICELIB functions
//
//
// Local variables
//
//
// Get the biggest component of each of the two vectors.
//
MAXV1 = intrinsics::DMAX1(&[f64::abs(V1[1]), f64::abs(V1[2]), f64::abs(V1[3])]);
MAXV2 = intrinsics::DMAX1(&[f64::abs(V2[1]), f64::abs(V2[2]), f64::abs(V2[3])]);
//
// Scale V1 and V2 by 1/MAXV1 and 1/MAXV2 respectively
//
if (MAXV1 != 0 as f64) {
TV1[1] = (V1[1] / MAXV1);
TV1[2] = (V1[2] / MAXV1);
TV1[3] = (V1[3] / MAXV1);
} else {
TV1[1] = 0.0;
TV1[2] = 0.0;
TV1[3] = 0.0;
}
if (MAXV2 != 0 as f64) {
TV2[1] = (V2[1] / MAXV2);
TV2[2] = (V2[2] / MAXV2);
TV2[3] = (V2[3] / MAXV2);
} else {
TV2[1] = 0.0;
TV2[2] = 0.0;
TV2[3] = 0.0;
}
//
// Calculate the cross product of V1 and V2
//
VCROSS[1] = ((TV1[2] * TV2[3]) - (TV1[3] * TV2[2]));
VCROSS[2] = ((TV1[3] * TV2[1]) - (TV1[1] * TV2[3]));
VCROSS[3] = ((TV1[1] * TV2[2]) - (TV1[2] * TV2[1]));
//
// Get the magnitude of VCROSS and normalize it
//
VMAG = VNORM(VCROSS.as_slice());
if (VMAG > 0.0) {
VOUT[1] = (VCROSS[1] / VMAG);
VOUT[2] = (VCROSS[2] / VMAG);
VOUT[3] = (VCROSS[3] / VMAG);
} else {
VOUT[1] = 0.0;
VOUT[2] = 0.0;
VOUT[3] = 0.0;
}
}