Index of Functions: A B C D E F G H I J K L M N O P Q R S T U V W X
Index Page wncond_c
Table of contents
Procedure Abstract Required_Reading Keywords Brief_I/O Detailed_Input | Detailed_Output Parameters Exceptions Files Particulars Examples | Restrictions Literature_References Author_and_Institution Version Index_Entries
#### Procedure
       wncond_c ( Contract the intervals of a DP window )

       void wncond_c ( SpiceDouble     left,
                       SpiceDouble     right,
                       SpiceCell     * window )
#### Abstract
       Contract each of the intervals of a double precision window.
#### Required_Reading
       WINDOWS
#### Keywords
       WINDOWS
#### Brief_I/O
       VARIABLE  I/O  DESCRIPTION
       --------  ---  --------------------------------------------------
       left       I   Amount added to each left endpoint.
       right      I   Amount subtracted from each right endpoint.
       window    I-O  Window to be contracted.
#### Detailed_Input
       left        is the amount to be added to the left endpoint of each
                   interval in the input window. The amount `left' is signed.

       right       is the amount to be subtracted from the right endpoint of
                   each interval in the window. The amount `right' is signed.

       window      on input, is a window containing zero or more
                   intervals.

                   `window' must be declared as a double precision SpiceCell.

                   CSPICE provides the following macro, which declares and
                   initializes the cell

                      SPICEDOUBLE_CELL        ( window, WINDOWSZ );

                   where WINDOWSZ is the maximum capacity of `window'.
#### Detailed_Output
       window      on output, is the original window with each of its
                   intervals contracted by `left' units on the left and
                   `right' units on the right.
#### Parameters
       None.
#### Exceptions
       1)  The cardinality of the input `window' must be even. Left
           endpoints of stored intervals must be strictly greater than
           preceding right endpoints. Right endpoints must be greater
           than or equal to corresponding left endpoints. Invalid window
           data are not diagnosed by this routine and may lead to
           unpredictable results.

       2)  If the `window' cell argument has a type other than
           SpiceDouble, the error SPICE(TYPEMISMATCH) is signaled.
#### Files
       None.
#### Particulars
       This routine contracts (shortens) each of the intervals in
       the input window. The adjustments are not necessarily symmetric.
       That is, left units are added to the left endpoint of each
       interval, and right units are subtracted from the right endpoint
       of each interval, where left and right may be different.

       Intervals are dropped when they are contracted by amounts
       greater than their measures.
#### Examples
       Let window contain the intervals

          [ 1, 3 ]  [ 7, 11 ]  [ 23, 27 ]  [ 29, 29 ]

       Then the following series of calls

          wncond_c (  2,  1, &window );              (1)
          wncond_c ( -2,  2, &window );              (2)
          wncond_c ( -2, -1, &window );              (3)

       produces the following series of windows

          [ 9, 10 ]  [ 25, 26 ]                      (1)
          [ 7,  8 ]  [ 23, 24 ]                      (2)
          [ 5,  9 ]  [ 21, 25 ]                      (3)

       Note that intervals may be "contracted" by negative amounts.
       In the example above, the second call shifts each interval to
       the left, while the third call undoes the effect of the first
       call (without restoring the destroyed intervals).

       Note also that the third call is exactly equivalent to the
       call

          wnexpd_c ( 2, 1, window );
#### Restrictions
       None.
#### Literature_References
       None.
#### Author_and_Institution
       N.J. Bachman        (JPL)
       J. Diaz del Rio     (ODC Space)
       H.A. Neilan         (JPL)
       W.L. Taber          (JPL)
       I.M. Underwood      (JPL)
#### Version
       -CSPICE Version 1.0.1, 05-AUG-2021 (JDR)

           Edited the header to comply with NAIF standard.

           Extended description of argument "window" in -Detailed_Input to include
           type and preferred declaration method.

           Added entry #1 in -Exceptions section.

       -CSPICE Version 1.0.0, 21-JUL-2002 (NJB) (HAN) (WLT) (IMU)
#### Index_Entries
       contract the intervals of a d.p. window
#### Link to routine wncond_c source file wncond_c.c

    Fri Dec 31 18:41:15 2021