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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
struct SaveVars {
VALUE: f64,
}
impl SaveInit for SaveVars {
fn new() -> Self {
let mut VALUE: f64 = 0.0;
VALUE = 0.0;
Self { VALUE }
}
}
/// Value of pi
///
/// Return the value of pi (the ratio of the circumference of
/// a circle to its diameter).
///
/// # Brief I/O
///
/// ```text
/// The function returns the value of pi.
/// ```
///
/// # Detailed Output
///
/// ```text
/// The function returns the value of pi (the ratio of a circle's
/// circumference to its diameter), determined by the ACOS function.
/// That is,
///
/// PI = ACOS ( -1.D0 )
/// ```
///
/// # Exceptions
///
/// ```text
/// Error free.
/// ```
///
/// # Particulars
///
/// ```text
/// The first time the function is referenced, the value is computed
/// as shown above. The value is saved, and returned directly upon
/// subsequent reference.
/// ```
///
/// # Examples
///
/// ```text
/// The code fragment below illustrates the use of PI.
///
/// C
/// C Compute the polar radius,
/// C
/// C p
/// C ----------------
/// C 1 + e cos(theta)
/// C
/// C at evenly spaced values of the polar angle, theta.
/// C
/// DELTA = PI() / N
///
/// DO I = 0, N
/// R(I) = P / (1.D0 + ECC * COS(I*DELTA))
/// END DO
/// ```
///
/// # Author and Institution
///
/// ```text
/// J. Diaz del Rio (ODC Space)
/// W.L. Taber (JPL)
/// I.M. Underwood (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.0.2, 08-JUL-2020 (JDR)
///
/// Edited the header to comply with NAIF standard.
///
/// - 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) (IMU)
/// ```
pub fn pi(ctx: &mut SpiceContext) -> f64 {
let ret = PI(ctx.raw_context());
ret
}
//$Procedure PI ( Value of pi )
pub fn PI(ctx: &mut Context) -> f64 {
let save = ctx.get_vars::<SaveVars>();
let save = &mut *save.borrow_mut();
let mut PI: f64 = 0.0;
//
// Local variables
//
//
// Initial values
//
//
// What is there to say?
//
if (save.VALUE == 0.0) {
save.VALUE = f64::acos(-1.0);
}
PI = save.VALUE;
PI
}