/*

-Procedure wnexpd_c ( Expand the intervals of a DP window )

-Abstract
 
   Expand each of the intervals of a double precision window. 
 
-Disclaimer

   THIS SOFTWARE AND ANY RELATED MATERIALS WERE CREATED BY THE
   CALIFORNIA INSTITUTE OF TECHNOLOGY (CALTECH) UNDER A U.S.
   GOVERNMENT CONTRACT WITH THE NATIONAL AERONAUTICS AND SPACE
   ADMINISTRATION (NASA). THE SOFTWARE IS TECHNOLOGY AND SOFTWARE
   PUBLICLY AVAILABLE UNDER U.S. EXPORT LAWS AND IS PROVIDED "AS-IS"
   TO THE RECIPIENT WITHOUT WARRANTY OF ANY KIND, INCLUDING ANY
   WARRANTIES OF PERFORMANCE OR MERCHANTABILITY OR FITNESS FOR A
   PARTICULAR USE OR PURPOSE (AS SET FORTH IN UNITED STATES UCC
   SECTIONS 2312-2313) OR FOR ANY PURPOSE WHATSOEVER, FOR THE
   SOFTWARE AND RELATED MATERIALS, HOWEVER USED.

   IN NO EVENT SHALL CALTECH, ITS JET PROPULSION LABORATORY, OR NASA
   BE LIABLE FOR ANY DAMAGES AND/OR COSTS, INCLUDING, BUT NOT
   LIMITED TO, INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND,
   INCLUDING ECONOMIC DAMAGE OR INJURY TO PROPERTY AND LOST PROFITS,
   REGARDLESS OF WHETHER CALTECH, JPL, OR NASA BE ADVISED, HAVE
   REASON TO KNOW, OR, IN FACT, SHALL KNOW OF THE POSSIBILITY.

   RECIPIENT BEARS ALL RISK RELATING TO QUALITY AND PERFORMANCE OF
   THE SOFTWARE AND ANY RELATED MATERIALS, AND AGREES TO INDEMNIFY
   CALTECH AND NASA FOR ALL THIRD-PARTY CLAIMS RESULTING FROM THE
   ACTIONS OF RECIPIENT IN THE USE OF THE SOFTWARE.

-Required_Reading
 
   WINDOWS 
 
-Keywords
 
   WINDOWS 
 
*/

   #include "SpiceUsr.h"
   #include "SpiceZfc.h"
   #include "SpiceZmc.h"


   void wnexpd_c ( SpiceDouble    left,
                   SpiceDouble    right,
                   SpiceCell    * window ) 

/*

-Brief_I/O
 
   VARIABLE  I/O  DESCRIPTION 
   --------  ---  -------------------------------------------------- 
   left       I   Amount subtracted from each left endpoint. 
   right      I   Amount added to each right endpoint. 
   window    I,O  Window to be expanded. 
 
-Detailed_Input
 
   left        is the amount to be subtracted from the left 
               endpoint of each interval in the input window. 
 
   right       is the amount to be added to the right endpoint 
               of each interval in the window. 
 
   window      on input, is a window containing zero or more 
               intervals. 

               window must be declared as a double precision
               SpiceCell.
 
-Detailed_Output
 
   window      on output, is the original window with each of its 
               intervals expanded by left units on the left and 
               right units on the right. 
 
-Parameters
 
   None. 
 
-Exceptions
 
   1) If the input window does not have double precision type,
      the error SPICE(TYPEMISMATCH) is signaled.
 
-Files
 
   None. 
 
-Particulars
 
   This routine expands (lengthens) each of the intervals in 
   the input window. The adjustments are not necessarily symmetric. 
   That is, left units are subtracted from the left endpoint of 
   each interval, and right units are added to the right endpoint 
   of each interval, where left and right may be different. 

   Intervals are merged when expansion causes them to overlap. 
 
-Examples
 
   Let window contain the intervals 

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

   Then the following series of calls 

      wnexpd_c (  2.0,  1.0, &window );              (1) 
      wnexpd_c ( -2.0,  2.0, &window );              (2) 
      wnexpd_c ( -2.0, -1.0, &window );              (3) 

   produces the following series of windows 

      [ -1, 4 ]  [ 5, 12 ]  [ 21, 30 ]               (1) 
      [  1, 6 ]  [ 7, 14 ]  [ 23, 32 ]               (2) 
      [  3, 5 ]  [ 9, 13 ]  [ 25, 31 ]               (3) 

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

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

      wncond_c ( 2, 1, &window );


-Restrictions
 
   None. 
 
-Literature_References
 
   None. 
 
-Author_and_Institution
 
   N.J. Bachman    (JPL)
   H.A. Neilan     (JPL) 
   W.L. Taber      (JPL) 
   I.M. Underwood  (JPL) 
 
-Version
 
   -CSPICE Version 1.0.0, 29-JUL-2002 (NJB) (HAN) (WLT) (IMU)

-Index_Entries
 
   expand the intervals of a d.p. window 
 
-&
*/

{ /* Begin wnexpd_c */


   /*
   Use discovery check-in.

   Make sure cell data type is d.p. 
   */
   CELLTYPECHK ( CHK_DISCOVER, "wnexpd_c", SPICE_DP, window );


   /*
   Initialize the cell if necessary. 
   */
   CELLINIT ( window );
   

   /*
   Let the f2c'd routine do the work. 
   */
   wnexpd_ ( (doublereal * )  &left,
             (doublereal * )  &right,
             (doublereal * )  (window->base) );

   /*
   Sync the output cell. 
   */
   zzsynccl_c ( F2C, window );


} /* End wnexpd_c */
