update ast 8.6.2

1 files changed, 0 insertions, 2596 deletions

diff --git a/ast/grismmap.c b/ast/grismmap.c
deleted file mode 100644
index dfdd10b..0000000
--- a/ast/grismmap.c
+++ /dev/null
@@ -1,2596 +0,0 @@
-/*
-*class++
-*  Name:
-*     GrismMap
-
-*  Purpose:
-*     Transform 1-dimensional coordinates using a grism dispersion equation.
-
-*  Constructor Function:
-c     astGrismMap
-f     AST_GRISMMAP
-
-*  Description:
-*     A GrismMap is a specialised form of Mapping which transforms
-*     1-dimensional coordinates using the spectral dispersion equation
-*     described in FITS-WCS paper III "Representation of spectral
-*     coordinates in FITS". This describes the dispersion produced by
-*     gratings, prisms and grisms.
-*
-*     When initially created, the forward transformation of a GrismMap
-*     transforms input "grism parameter" values into output wavelength
-*     values. The "grism parameter" is a dimensionless value which is
-*     linearly related to position on the detector. It is defined in FITS-WCS
-*     paper III as "the offset on the detector from the point of intersection
-*     of the camera axis, measured in units of the effective local length".
-*     The units in which wavelength values are expected or returned is
-*     determined by the values supplied for the GrismWaveR, GrismNRP and
-*     GrismG attribute: whatever units are used for these attributes will
-*     also be used for the wavelength values.
-
-*  Inheritance:
-*     The GrismMap class inherits from the Mapping class.
-
-*  Attributes:
-*     In addition to those attributes common to all Mappings, every
-*     GrismMap also has the following attributes:
-*
-*     - GrismNR: The refractive index at the reference wavelength
-*     - GrismNRP: Rate of change of refractive index with wavelength
-*     - GrismWaveR: The reference wavelength
-*     - GrismAlpha: The angle of incidence of the incoming light
-*     - GrismG: The grating ruling density
-*     - GrismM: The interference order
-*     - GrismEps: The angle between the normal and the dispersion plane
-*     - GrismTheta: Angle between normal to detector plane and reference ray
-
-*  Functions:
-c     The GrismMap class does not define any new functions beyond those
-f     The GrismMap class does not define any new routines beyond those
-*     which are applicable to all Mappings.
-
-*  Copyright:
-*     Copyright (C) 1997-2006 Council for the Central Laboratory of the
-*     Research Councils
-
-*  Licence:
-*     This program is free software: you can redistribute it and/or
-*     modify it under the terms of the GNU Lesser General Public
-*     License as published by the Free Software Foundation, either
-*     version 3 of the License, or (at your option) any later
-*     version.
-*
-*     This program is distributed in the hope that it will be useful,
-*     but WITHOUT ANY WARRANTY; without even the implied warranty of
-*     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-*     GNU Lesser General Public License for more details.
-*
-*     You should have received a copy of the GNU Lesser General
-*     License along with this program.  If not, see
-*     <http://www.gnu.org/licenses/>.
-
-*  Authors:
-*     DSB: David S. Berry (Starlink)
-
-*  History:
-*     18-JUN-2003 (DSB):
-*        Original version.
-*     10-MAY-2006 (DSB):
-*        Override astEqual.
-*class--
-*/
-
-/* Module Macros. */
-/* ============== */
-/* Set the name of the class we are implementing. This indicates to
-   the header files that define class interfaces that they should make
-   "protected" symbols available. */
-#define astCLASS GrismMap
-
-
-/*
-*  Name:
-*     MAKE_CLEAR
-
-*  Purpose:
-*     Implement a method to clear an attribute value for a GrismMap.
-
-*  Type:
-*     Private macro.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     MAKE_CLEAR(class,attribute,component,assign)
-
-*  Class Membership:
-*     Defined by the GrismMap class.
-
-*  Description:
-*     This macro expands to an implementation of a private member function of
-*     the form:
-*
-*        static void Clear<Attribute>( AstGrismMap *this )
-*
-*     and an external interface function of the form:
-*
-*        void astClear<Attribute>_( AstGrismMap *this )
-*
-*     which implement a method for clearing a specified attribute value for
-*     a class. The derived constants stored in the GrismMap structure are
-*     updated after the attribute has been cleared.
-
-*  Parameters:
-*     class
-*        The name (not the type) of the class to which the attribute belongs.
-*     attribute
-*        The name of the attribute to be cleared, as it appears in the function
-*        name (e.g. Label in "astClearLabel").
-*     component
-*        The name of the class structure component that holds the attribute
-*        value.
-*     assign
-*        An expression that evaluates to the value to assign to the component
-*        to clear its value.
-
-*  Notes:
-*     -  To avoid problems with some compilers, you should not leave any white
-*     space around the macro arguments.
-*/
-
-/* Define the macro. */
-#define MAKE_CLEAR(class,attribute,component,assign) \
-\
-/* Private member function. */ \
-/* ------------------------ */ \
-static void Clear##attribute( Ast##class *this, int *status ) { \
-\
-/* Check the global error status. */ \
-   if ( !astOK ) return; \
-\
-/* Report an error if the object has been cloned (i.e. has a reference \
-   count that is greater than one). */ \
-   if( astGetRefCount( this ) > 1 ) { \
-      astError( AST__IMMUT, "astClear(%s): The " #attribute "attribute of " \
-                "the supplied %s cannot be cleared because the %s has " \
-                "been cloned (programming error).", status, \
-                astGetClass(this), astGetClass(this), astGetClass(this) ); \
-\
-/* Otherwise, assign the "clear" value in the structure component. */ \
-   } else { \
-      this->component = (assign); \
-   } \
-\
-/* Update the derived constants. */ \
-   UpdateConstants( this, status ); \
-} \
-\
-/* External interface. */ \
-/* ------------------- */ \
-void astClear##attribute##_( Ast##class *this, int *status ) { \
-\
-/* Check the global error status. */ \
-   if ( !astOK ) return; \
-\
-/* Invoke the required method via the virtual function table. */ \
-   (**astMEMBER(this,class,Clear##attribute))( this, status ); \
-}
-
-/*
-*  Name:
-*     MAKE_SET
-
-*  Purpose:
-*     Implement a method to set an attribute value for a GrismMap.
-
-*  Type:
-*     Private macro.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     astMAKE_SET(class,attribute,type,component,assign)
-
-*  Class Membership:
-*     Defined by the GrismMap class.
-
-*  Description:
-*     This macro expands to an implementation of a private member function of
-*     the form:
-*
-*        static void Set<Attribute>( AstGrismMap *this, <Type> value )
-*
-*     and an external interface function of the form:
-*
-*        void astSet<Attribute>_( AstGrismMap *this, <Type> value )
-*
-*     which implement a method for setting a specified attribute value for a
-*     GrismMap. The derived constants stored in the GrismMap structure are
-*     updated after the attribute has been cleared.
-
-*  Parameters:
-*      class
-*         The name (not the type) of the class to which the attribute belongs.
-*      attribute
-*         The name of the attribute to be set, as it appears in the function
-*         name (e.g. Label in "astSetLabel").
-*      type
-*         The C type of the attribute.
-*      component
-*         The name of the class structure component that holds the attribute
-*         value.
-*      assign
-*         An expression that evaluates to the value to be assigned to the
-*         component.
-
-*  Notes:
-*     - To avoid problems with some compilers, you should not leave
-*     any white space around the macro arguments.
-*/
-
-/* Define the macro. */
-#define MAKE_SET(class,attribute,type,component,assign) \
-\
-/* Private member function. */ \
-/* ------------------------ */ \
-static void Set##attribute( Ast##class *this, type value, int *status ) { \
-\
-/* Check the global error status. */ \
-   if ( !astOK ) return; \
-\
-/* Report an error if the object has been cloned (i.e. has a reference \
-   count that is greater than one). */ \
-   if( astGetRefCount( this ) > 1 ) { \
-      astError( AST__IMMUT, "astSet(%s): The " #attribute "attribute of " \
-                "the supplied %s cannot be changed because the %s has " \
-                "been cloned (programming error).", status, \
-                astGetClass(this), astGetClass(this), astGetClass(this) ); \
-\
-/* Otherwise, store the new value in the structure component. */ \
-   } else { \
-      this->component = (assign); \
-   } \
-\
-/* Update the derived constants. */ \
-   UpdateConstants( this, status ); \
-} \
-\
-/* External interface. */ \
-/* ------------------- */ \
-void astSet##attribute##_( Ast##class *this, type value, int *status ) { \
-\
-/* Check the global error status. */ \
-   if ( !astOK ) return; \
-\
-/* Invoke the required method via the virtual function table. */ \
-   (**astMEMBER(this,class,Set##attribute))( this, value, status ); \
-}
-
-
-/* Include files. */
-/* ============== */
-/* Interface definitions. */
-/* ---------------------- */
-
-#include "globals.h"             /* Thread-safe global data access */
-#include "error.h"               /* Error reporting facilities */
-#include "memory.h"              /* Memory management facilities */
-#include "globals.h"             /* Thread-safe global data access */
-#include "object.h"              /* Base Object class */
-#include "pointset.h"            /* Sets of points/coordinates */
-#include "mapping.h"             /* Coordinate mappings (parent class) */
-#include "unitmap.h"             /* Unit Mappings */
-#include "channel.h"             /* I/O channels */
-#include "zoommap.h"             /* ZoomMap interface */
-#include "winmap.h"              /* WinMap interface */
-#include "grismmap.h"            /* Interface definition for this class */
-
-/* Error code definitions. */
-/* ----------------------- */
-#include "ast_err.h"             /* AST error codes */
-
-/* C header files. */
-/* --------------- */
-#include <ctype.h>
-#include <float.h>
-#include <math.h>
-#include <stdarg.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <limits.h>
-#include <string.h>
-
-/* Macros which return the maximum and minimum of two values. */
-#define MAX(aa,bb) ((aa)>(bb)?(aa):(bb))
-#define MIN(aa,bb) ((aa)<(bb)?(aa):(bb))
-
-/* Module Variables. */
-/* ================= */
-
-/* Address of this static variable is used as a unique identifier for
-   member of this class. */
-static int class_check;
-
-/* Pointers to parent class methods which are extended by this class. */
-static AstPointSet *(* parent_transform)( AstMapping *, AstPointSet *, int, AstPointSet *, int * );
-static const char *(* parent_getattrib)( AstObject *, const char *, int * );
-static int (* parent_testattrib)( AstObject *, const char *, int * );
-static void (* parent_clearattrib)( AstObject *, const char *, int * );
-static void (* parent_setattrib)( AstObject *, const char *, int * );
-
-/* Define macros for accessing each item of thread specific global data. */
-#ifdef THREAD_SAFE
-
-/* Define how to initialise thread-specific globals. */
-#define GLOBAL_inits \
-   globals->Class_Init = 0; \
-   globals->GetAttrib_Buff[ 0 ] = 0;
-
-/* Create the function that initialises global data for this module. */
-astMAKE_INITGLOBALS(GrismMap)
-
-/* Define macros for accessing each item of thread specific global data. */
-#define class_init astGLOBAL(GrismMap,Class_Init)
-#define class_vtab astGLOBAL(GrismMap,Class_Vtab)
-#define getattrib_buff astGLOBAL(GrismMap,GetAttrib_Buff)
-
-
-
-/* If thread safety is not needed, declare and initialise globals at static
-   variables. */
-#else
-
-static char getattrib_buff[ 101 ];
-
-
-/* Define the class virtual function table and its initialisation flag
-   as static variables. */
-static AstGrismMapVtab class_vtab;   /* Virtual function table */
-static int class_init = 0;       /* Virtual function table initialised? */
-
-#endif
-
-/* External Interface Function Prototypes. */
-/* ======================================= */
-/* The following functions have public prototypes only (i.e. no
-   protected prototypes), so we must provide local prototypes for use
-   within this module. */
-AstGrismMap *astGrismMapId_( const char *, ... );
-
-/* Prototypes for Private Member Functions. */
-/* ======================================== */
-static AstPointSet *Transform( AstMapping *, AstPointSet *, int, AstPointSet *, int * );
-static const char *GetAttrib( AstObject *, const char *, int * );
-static AstMapping *CanMerge( AstMapping *, int, AstMapping *, int, int * );
-static int MapMerge( AstMapping *, int, int, int *, AstMapping ***, int **, int * );
-static int TestAttrib( AstObject *, const char *, int * );
-static void ClearAttrib( AstObject *, const char *, int * );
-static void Dump( AstObject *, AstChannel *, int * );
-static int Equal( AstObject *, AstObject *, int * );
-static void SetAttrib( AstObject *, const char *, int * );
-static void UpdateConstants( AstGrismMap *, int * );
-
-static double GetGrismNR( AstGrismMap *, int * );
-static int TestGrismNR( AstGrismMap *, int * );
-static void ClearGrismNR( AstGrismMap *, int * );
-static void SetGrismNR( AstGrismMap *, double, int * );
-
-static double GetGrismNRP( AstGrismMap *, int * );
-static int TestGrismNRP( AstGrismMap *, int * );
-static void ClearGrismNRP( AstGrismMap *, int * );
-static void SetGrismNRP( AstGrismMap *, double, int * );
-
-static double GetGrismWaveR( AstGrismMap *, int * );
-static int TestGrismWaveR( AstGrismMap *, int * );
-static void ClearGrismWaveR( AstGrismMap *, int * );
-static void SetGrismWaveR( AstGrismMap *, double, int * );
-
-static double GetGrismAlpha( AstGrismMap *, int * );
-static int TestGrismAlpha( AstGrismMap *, int * );
-static void ClearGrismAlpha( AstGrismMap *, int * );
-static void SetGrismAlpha( AstGrismMap *, double, int * );
-
-static double GetGrismG( AstGrismMap *, int * );
-static int TestGrismG( AstGrismMap *, int * );
-static void ClearGrismG( AstGrismMap *, int * );
-static void SetGrismG( AstGrismMap *, double, int * );
-
-static int GetGrismM( AstGrismMap *, int * );
-static int TestGrismM( AstGrismMap *, int * );
-static void ClearGrismM( AstGrismMap *, int * );
-static void SetGrismM( AstGrismMap *, int, int * );
-
-static double GetGrismEps( AstGrismMap *, int * );
-static int TestGrismEps( AstGrismMap *, int * );
-static void ClearGrismEps( AstGrismMap *, int * );
-static void SetGrismEps( AstGrismMap *, double, int * );
-
-static double GetGrismTheta( AstGrismMap *, int * );
-static int TestGrismTheta( AstGrismMap *, int * );
-static void ClearGrismTheta( AstGrismMap *, int * );
-static void SetGrismTheta( AstGrismMap *, double, int * );
-
-/* Member functions. */
-/* ================= */
-static AstMapping *CanMerge( AstMapping *map1, int inv1, AstMapping *map2,
-                             int inv2, int *status ){
-/*
-*
-*  Name:
-*     CanMerge
-
-*  Purpose:
-*     Checks if two GrismMaps can be merged.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     AstMapping *CanMerge( AstMapping *map1, int inv1, AstMapping *map2,
-*                           int inv2, int *status )
-
-*  Class Membership:
-*     GrismMap internal utility function.
-
-*  Description:
-*     This function checks the two supplied Mappings to see if they can
-*     be merged into a single Mapping. One of the two Mappings should be
-*     a GrismMap. If they can be merged, the Merged Mapping is returned
-*     as the function value. Otherwise NULL is returned.
-
-*  Parameters:
-*     map1
-*        A pointer to the first mapping.
-*     map2
-*        A pointer to the second mapping.
-*     inv1
-*        The invert flag to use with the first mapping.
-*     inv2
-*        The invert flag to use with the second mapping.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     A pointer to the merged Mapping if the supplied Mappings can be merged,
-*     NULL otherwise.
-
-*/
-
-/* Local Variables: */
-   AstGrismMap *gmap2;        /* Pointer to second GrismMap */
-   AstGrismMap *gmap;         /* Pointer to first GrismMap */
-   AstMapping *ret;           /* Returned merged Mapping */
-   double g;                  /* The value of the GrismG attribute */
-   double nrp;                /* The value of the GrismNRP attribute */
-   double waver;              /* The value of the GrismWaveR attribute */
-   double z;                  /* Wavelength scaling */
-   int invert_result;         /* Is "ret" the inverse of the required Mapping? */
-
-/* Initialise the returned value. */
-   ret = NULL;
-
-/* Check the global error status. */
-   if ( !astOK ) return ret;
-
-/* Initialise variables to avoid "used of uninitialised variable"
-   messages from dumb compilers. */
-   gmap = NULL;
-   invert_result = 0;
-
-/* Initialise the zoom factor of the adjacent ZoomMap to indicate
-   that we have not yet found an adjacent ZoomMap. */
-   z = AST__BAD;
-
-/* If the first Mapping is a GrismMap... */
-   if( !strcmp( "GrismMap", astGetClass( map1 ) ) ) {
-      gmap = (AstGrismMap *) map1;
-
-/* If the second Mapping is also a GrismMap, they can be merged into a
-   UnitMap if one GrismMap is the inverse of the other. */
-      if( !strcmp( "GrismMap", astGetClass( map2 ) ) ) {
-         gmap2 = (AstGrismMap *) map2;
-
-/* Check that the two GrismMaps have the same attribute values. */
-         if( astEQUAL( astGetGrismNR( gmap ), astGetGrismNR( gmap2 )) &&
-             astEQUAL( astGetGrismNRP( gmap ), astGetGrismNRP( gmap2 )) &&
-             astEQUAL( astGetGrismWaveR( gmap ), astGetGrismWaveR( gmap2 )) &&
-             astEQUAL( astGetGrismAlpha( gmap ), astGetGrismAlpha( gmap2 )) &&
-             astEQUAL( astGetGrismG( gmap ), astGetGrismG( gmap2 )) &&
-             astGetGrismM( gmap ) != astGetGrismM( gmap2 ) &&
-             astEQUAL( astGetGrismEps( gmap ), astGetGrismEps( gmap2 )) &&
-             astEQUAL( astGetGrismTheta( gmap ), astGetGrismTheta( gmap2 )) ){
-
-/* If so, check that the GrismMaps are applied in opposite senses. If so
-   we can cancel the two GrismMaps, so return a UnitMap. */
-            if( inv1 != inv2 ) ret = (AstMapping *) astUnitMap( 1, "", status );
-         }
-
-/* If the first Mapping is a GrismMap but the second one is not... */
-      } else {
-
-/* We can merge the GrismMap with the second Mapping if the GrismMap has
-   not been inverted (i.e. if the wavelength output produced by the
-   GrismMap is fed as input to the second Mapping), and if the second
-   Mapping is a ZoomMap. */
-         if( !inv1 ) {
-
-/* Indicate that any merged Mapping to be created later will not need to
-   be inverted. */
-            invert_result = 0;
-
-/* See if the second Mapping is a ZoomMap, and if so, get the zoom
-   factor. If the Invert attribute in the ZoomMap is not set to the
-   required value, invert the zoom factor. This gives us the required
-   *forward* transformation. */
-            if( !strcmp( "ZoomMap", astGetClass( map2 ) ) ) {
-               z = astGetZoom( (AstZoomMap *) map2 );
-               if( astGetInvert( map2 ) != inv2 && z != 0.0 ) z = 1.0/z;
-            }
-         }
-      }
-
-/* If the first Mapping is not a GrismMap, but the second one is... */
-   } else if( !strcmp( "GrismMap", astGetClass( map2 ) ) ) {
-      gmap = (AstGrismMap *) map2;
-
-/* We can merge the GrismMap with the first Mapping if the GrismMap has
-   been inverted (i.e. if the wavelength output produced by the first
-   Mapping is fed as input to the inverted GrismMap), and if the first
-   Mapping is a ZoomMap. */
-      if( inv2 ) {
-
-/* It is easier to consider pairs of Mappings in which an un-inverted
-   GrismMap is followed by a ZoomMap (as in the above case). For this
-   reason, we invert the Mappings here, so that the merged Mapping created
-   later will be in the inverse of the required Mapping. Indicate that the
-   merged Mapping will therefore need to be inverted before being returned. */
-         invert_result = 1;
-
-/* See if the first Mapping is a ZoomMap. If so, get the zoom factor. If the
-   Invert attribute in the ZoomMap is not set to the opposite of the required
-   value, invert the zoom factor. This gives us the required *inverse*
-   transformation. */
-         if( !strcmp( "ZoomMap", astGetClass( map1 ) ) ) {
-            z = astGetZoom( (AstZoomMap *) map1 );
-            if( astGetInvert( map1 ) == inv1 && z != 0.0 ) z = 1.0/z;
-         }
-      }
-   }
-
-/* If required, produce the merged Mapping by merging the forward
-   GrismMap with the following ZoomMap (and then invert the
-   resulting Mapping if it is in the wrong direction). */
-   if( !ret && z != AST__BAD && z != 0.0 ) {
-
-/* Ensure we have a forward GrismMap. */
-      ret = astCopy( gmap );
-      astSetInvert( ret, 0 );
-
-/* Get the required GrismMap attribute values. */
-      g = astGetGrismG( ret );
-      nrp = astGetGrismNRP( ret );
-      waver = astGetGrismWaveR( ret );
-
-/* The above code ensures that z is the zoom factor from the wavelength
-   produced by the forward GrismMap to the final (modified) wavelength units.
-   Set the new GrismMap attribute values. GrismG, GrismNRP and GrismWaveR have
-   units of length and are scaled to represent new length units using the
-   zoom factor found above. */
-      g /= z;
-      nrp /= z;
-      waver *= z;
-
-      astSetGrismG( ret, g );
-      astSetGrismNRP( ret, nrp );
-      astSetGrismWaveR( ret, waver );
-
-/* If required invert this GrismMap. */
-      if( invert_result ) astInvert( ret );
-
-   }
-
-/* Return the answer. */
-   return ret;
-}
-
-static void ClearAttrib( AstObject *this_object, const char *attrib, int *status ) {
-/*
-*  Name:
-*     ClearAttrib
-
-*  Purpose:
-*     Clear an attribute value for a GrismMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     void ClearAttrib( AstObject *this, const char *attrib, int *status )
-
-*  Class Membership:
-*     GrismMap member function (over-rides the astClearAttrib protected
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function clears the value of a specified attribute for a
-*     GrismMap, so that the default value will subsequently be used.
-
-*  Parameters:
-*     this
-*        Pointer to the GrismMap.
-*     attrib
-*        Pointer to a null-terminated string specifying the attribute
-*        name.  This should be in lower case with no surrounding white
-*        space.
-*     status
-*        Pointer to the inherited status variable.
-*/
-
-/* Local Variables: */
-   AstGrismMap *this;             /* Pointer to the GrismMap structure */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Obtain a pointer to the GrismMap structure. */
-   this = (AstGrismMap *) this_object;
-
-/* Check the attribute name and clear the appropriate attribute. */
-   if ( !strcmp( attrib, "grismnr" ) ) {
-      astClearGrismNR( this );
-
-   } else if ( !strcmp( attrib, "grismnrp" ) ) {
-      astClearGrismNRP( this );
-
-   } else if ( !strcmp( attrib, "grismwaver" ) ) {
-      astClearGrismWaveR( this );
-
-   } else if ( !strcmp( attrib, "grismalpha" ) ) {
-      astClearGrismAlpha( this );
-
-   } else if ( !strcmp( attrib, "grismg" ) ) {
-      astClearGrismG( this );
-
-   } else if ( !strcmp( attrib, "grismm" ) ) {
-      astClearGrismM( this );
-
-   } else if ( !strcmp( attrib, "grismeps" ) ) {
-      astClearGrismEps( this );
-
-   } else if ( !strcmp( attrib, "grismtheta" ) ) {
-      astClearGrismTheta( this );
-
-/* If the attribute is still not recognised, pass it on to the parent
-   method for further interpretation. */
-   } else {
-      (*parent_clearattrib)( this_object, attrib, status );
-   }
-}
-
-static int Equal( AstObject *this_object, AstObject *that_object, int *status ) {
-/*
-*  Name:
-*     Equal
-
-*  Purpose:
-*     Test if two GrismMaps are equivalent.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     int Equal( AstObject *this, AstObject *that, int *status )
-
-*  Class Membership:
-*     GrismMap member function (over-rides the astEqual protected
-*     method inherited from the astMapping class).
-
-*  Description:
-*     This function returns a boolean result (0 or 1) to indicate whether
-*     two GrismMaps are equivalent.
-
-*  Parameters:
-*     this
-*        Pointer to the first Object (a GrismMap).
-*     that
-*        Pointer to the second Object.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     One if the GrismMaps are equivalent, zero otherwise.
-
-*  Notes:
-*     - A value of zero will be returned if this function is invoked
-*     with the global status set, or if it should fail for any reason.
-*/
-
-/* Local Variables: */
-   AstGrismMap *that;
-   AstGrismMap *this;
-   int nin;
-   int nout;
-   int result;
-
-/* Initialise. */
-   result = 0;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Obtain pointers to the two GrismMap structures. */
-   this = (AstGrismMap *) this_object;
-   that = (AstGrismMap *) that_object;
-
-/* Check the second object is a GrismMap. We know the first is a
-   GrismMap since we have arrived at this implementation of the virtual
-   function. */
-   if( astIsAGrismMap( that ) ) {
-
-/* Get the number of inputs and outputs and check they are the same for both. */
-      nin = astGetNin( this );
-      nout = astGetNout( this );
-      if( astGetNin( that ) == nin && astGetNout( that ) == nout ) {
-
-/* If the Invert flags for the two GrismMaps differ, it may still be possible
-   for them to be equivalent. First compare the GrismMaps if their Invert
-   flags are the same. In this case all the attributes of the two GrismMaps
-   must be identical. */
-         if( astGetInvert( this ) == astGetInvert( that ) ) {
-
-            if( astEQUAL( this->nr, that->nr ) &&
-                astEQUAL( this->nrp, that->nrp ) &&
-                astEQUAL( this->waver, that->waver ) &&
-                astEQUAL( this->alpha, that->alpha ) &&
-                astEQUAL( this->g, that->g ) &&
-                this->m == that->m &&
-                astEQUAL( this->eps, that->eps ) &&
-                astEQUAL( this->theta, that->theta ) &&
-                astEQUAL( this->k1, that->k1 ) &&
-                astEQUAL( this->k2, that->k2 ) &&
-                astEQUAL( this->k3, that->k3 ) ) {
-                result = 1;
-             }
-
-/* If the Invert flags for the two GrismMaps differ, the attributes of the two
-   GrismMaps must be inversely related to each other. */
-         } else {
-
-/* In the specific case of a GrismMap, Invert flags must be equal. */
-            result = 0;
-
-         }
-      }
-   }
-
-/* If an error occurred, clear the result value. */
-   if ( !astOK ) result = 0;
-
-/* Return the result, */
-   return result;
-}
-
-static const char *GetAttrib( AstObject *this_object, const char *attrib, int *status ) {
-/*
-*  Name:
-*     GetAttrib
-
-*  Purpose:
-*     Get the value of a specified attribute for a GrismMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     const char *GetAttrib( AstObject *this, const char *attrib, int *status )
-
-*  Class Membership:
-*     GrismMap member function (over-rides the protected astGetAttrib
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function returns a pointer to the value of a specified
-*     attribute for a GrismMap, formatted as a character string.
-
-*  Parameters:
-*     this
-*        Pointer to the GrismMap.
-*     attrib
-*        Pointer to a null-terminated string containing the name of
-*        the attribute whose value is required. This name should be in
-*        lower case, with all white space removed.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     - Pointer to a null-terminated string containing the attribute
-*     value.
-
-*  Notes:
-*     - The returned string pointer may point at memory allocated
-*     within the GrismMap, or at static memory. The contents of the
-*     string may be over-written or the pointer may become invalid
-*     following a further invocation of the same function or any
-*     modification of the GrismMap. A copy of the string should
-*     therefore be made if necessary.
-*     - A NULL pointer will be returned if this function is invoked
-*     with the global error status set, or if it should fail for any
-*     reason.
-*/
-
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstGrismMap *this;            /* Pointer to the GrismMap structure */
-   const char *result;           /* Pointer value to return */
-   double dval;                  /* Attribute value */
-
-/* Initialise. */
-   result = NULL;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(this_object);
-
-/* Obtain a pointer to the GrismMap structure. */
-   this = (AstGrismMap *) this_object;
-
-/* Compare "attrib" with each recognised attribute name in turn,
-   obtaining the value of the required attribute. If necessary, write
-   the value into "getattrib_buff" as a null-terminated string in an appropriate
-   format.  Set "result" to point at the result string. */
-
-   if ( !strcmp( attrib, "grismnr" ) ) {
-      dval = astGetGrismNR( this );
-      if ( astOK ) {
-         (void) sprintf( getattrib_buff, "%.*g", DBL_DIG, dval );
-         result = getattrib_buff;
-      }
-
-   } else if ( !strcmp( attrib, "grismnrp" ) ) {
-      dval = astGetGrismNRP( this );
-      if ( astOK ) {
-         (void) sprintf( getattrib_buff, "%.*g", DBL_DIG, dval );
-         result = getattrib_buff;
-      }
-
-   } else if ( !strcmp( attrib, "grismwaver" ) ) {
-      dval = astGetGrismWaveR( this );
-      if ( astOK ) {
-         (void) sprintf( getattrib_buff, "%.*g", DBL_DIG, dval );
-         result = getattrib_buff;
-      }
-
-   } else if ( !strcmp( attrib, "grismalpha" ) ) {
-      dval = astGetGrismAlpha( this );
-      if ( astOK ) {
-         (void) sprintf( getattrib_buff, "%.*g", DBL_DIG, dval );
-         result = getattrib_buff;
-      }
-
-   } else if ( !strcmp( attrib, "grismg" ) ) {
-      dval = astGetGrismG( this );
-      if ( astOK ) {
-         (void) sprintf( getattrib_buff, "%.*g", DBL_DIG, dval );
-         result = getattrib_buff;
-      }
-
-   } else if ( !strcmp( attrib, "grismm" ) ) {
-      dval = astGetGrismM( this );
-      if ( astOK ) {
-         (void) sprintf( getattrib_buff, "%.*g", DBL_DIG, dval );
-         result = getattrib_buff;
-      }
-
-   } else if ( !strcmp( attrib, "grismeps" ) ) {
-      dval = astGetGrismEps( this );
-      if ( astOK ) {
-         (void) sprintf( getattrib_buff, "%.*g", DBL_DIG, dval );
-         result = getattrib_buff;
-      }
-
-   } else if ( !strcmp( attrib, "grismtheta" ) ) {
-      dval = astGetGrismTheta( this );
-      if ( astOK ) {
-         (void) sprintf( getattrib_buff, "%.*g", DBL_DIG, dval );
-         result = getattrib_buff;
-      }
-
-/* If the attribute name was not recognised, pass it on to the parent
-   method for further interpretation. */
-   } else {
-      result = (*parent_getattrib)( this_object, attrib, status );
-   }
-
-/* Return the result. */
-   return result;
-}
-
-void astInitGrismMapVtab_(  AstGrismMapVtab *vtab, const char *name, int *status ) {
-/*
-*+
-*  Name:
-*     astInitGrismMapVtab
-
-*  Purpose:
-*     Initialise a virtual function table for a GrismMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     void astInitGrismMapVtab( AstGrismMapVtab *vtab, const char *name )
-
-*  Class Membership:
-*     GrismMap vtab initialiser.
-
-*  Description:
-*     This function initialises the component of a virtual function
-*     table which is used by the GrismMap class.
-
-*  Parameters:
-*     vtab
-*        Pointer to the virtual function table. The components used by
-*        all ancestral classes will be initialised if they have not already
-*        been initialised.
-*     name
-*        Pointer to a constant null-terminated character string which contains
-*        the name of the class to which the virtual function table belongs (it
-*        is this pointer value that will subsequently be returned by the Object
-*        astClass function).
-*-
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstObjectVtab *object;        /* Pointer to Object component of Vtab */
-   AstMappingVtab *mapping;      /* Pointer to Mapping component of Vtab */
-
-/* Check the local error status. */
-   if ( !astOK ) return;
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(NULL);
-
-/* Initialize the component of the virtual function table used by the
-   parent class. */
-   astInitMappingVtab( (AstMappingVtab *) vtab, name );
-
-/* Store a unique "magic" value in the virtual function table. This
-   will be used (by astIsAGrismMap) to determine if an object belongs
-   to this class.  We can conveniently use the address of the (static)
-   class_check variable to generate this unique value. */
-   vtab->id.check = &class_check;
-   vtab->id.parent = &(((AstMappingVtab *) vtab)->id);
-
-/* Initialise member function pointers. */
-/* ------------------------------------ */
-/* Store pointers to the member functions (implemented here) that
-   provide virtual methods for this class. */
-   vtab->ClearGrismNR = ClearGrismNR;
-   vtab->GetGrismNR = GetGrismNR;
-   vtab->SetGrismNR = SetGrismNR;
-   vtab->TestGrismNR = TestGrismNR;
-
-   vtab->ClearGrismNRP = ClearGrismNRP;
-   vtab->GetGrismNRP = GetGrismNRP;
-   vtab->SetGrismNRP = SetGrismNRP;
-   vtab->TestGrismNRP = TestGrismNRP;
-
-   vtab->ClearGrismWaveR = ClearGrismWaveR;
-   vtab->GetGrismWaveR = GetGrismWaveR;
-   vtab->SetGrismWaveR = SetGrismWaveR;
-   vtab->TestGrismWaveR = TestGrismWaveR;
-
-   vtab->ClearGrismAlpha = ClearGrismAlpha;
-   vtab->GetGrismAlpha = GetGrismAlpha;
-   vtab->SetGrismAlpha = SetGrismAlpha;
-   vtab->TestGrismAlpha = TestGrismAlpha;
-
-   vtab->ClearGrismG = ClearGrismG;
-   vtab->GetGrismG = GetGrismG;
-   vtab->SetGrismG = SetGrismG;
-   vtab->TestGrismG = TestGrismG;
-
-   vtab->ClearGrismM = ClearGrismM;
-   vtab->GetGrismM = GetGrismM;
-   vtab->SetGrismM = SetGrismM;
-   vtab->TestGrismM = TestGrismM;
-
-   vtab->ClearGrismEps = ClearGrismEps;
-   vtab->GetGrismEps = GetGrismEps;
-   vtab->SetGrismEps = SetGrismEps;
-   vtab->TestGrismEps = TestGrismEps;
-
-   vtab->ClearGrismTheta = ClearGrismTheta;
-   vtab->GetGrismTheta = GetGrismTheta;
-   vtab->SetGrismTheta = SetGrismTheta;
-   vtab->TestGrismTheta = TestGrismTheta;
-
-/* Save the inherited pointers to methods that will be extended, and
-   replace them with pointers to the new member functions. */
-   object = (AstObjectVtab *) vtab;
-   mapping = (AstMappingVtab *) vtab;
-
-   parent_clearattrib = object->ClearAttrib;
-   object->ClearAttrib = ClearAttrib;
-   parent_getattrib = object->GetAttrib;
-   object->GetAttrib = GetAttrib;
-   parent_setattrib = object->SetAttrib;
-   object->SetAttrib = SetAttrib;
-   parent_testattrib = object->TestAttrib;
-   object->TestAttrib = TestAttrib;
-
-   parent_transform = mapping->Transform;
-   mapping->Transform = Transform;
-
-/* Store replacement pointers for methods which will be over-ridden by
-   new member functions implemented here. */
-   object->Equal = Equal;
-   mapping->MapMerge = MapMerge;
-
-/* Declare the class dump, copy and delete functions.*/
-   astSetDump( vtab, Dump, "GrismMap",
-               "Map 1-d coordinates using a spectral disperser" );
-
-/* If we have just initialised the vtab for the current class, indicate
-   that the vtab is now initialised, and store a pointer to the class
-   identifier in the base "object" level of the vtab. */
-   if( vtab == &class_vtab ) {
-      class_init = 1;
-      astSetVtabClassIdentifier( vtab, &(vtab->id) );
-   }
-}
-
-static int MapMerge( AstMapping *this, int where, int series, int *nmap,
-                     AstMapping ***map_list, int **invert_list, int *status ) {
-/*
-*  Name:
-*     MapMerge
-
-*  Purpose:
-*     Simplify a sequence of Mappings containing a GrismMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     int MapMerge( AstMapping *this, int where, int series, int *nmap,
-*                   AstMapping ***map_list, int **invert_list, int *status )
-
-*  Class Membership:
-*     GrismMap method (over-rides the protected astMapMerge method
-*     inherited from the Mapping class).
-
-*  Description:
-*     This function attempts to simplify a sequence of Mappings by
-*     merging a nominated GrismMap in the sequence with its neighbours,
-*     so as to shorten the sequence if possible.
-*
-*     In many cases, simplification will not be possible and the
-*     function will return -1 to indicate this, without further
-*     action.
-*
-*     In most cases of interest, however, this function will either
-*     attempt to replace the nominated GrismMap with a Mapping which it
-*     considers simpler, or to merge it with the Mappings which
-*     immediately precede it or follow it in the sequence (both will
-*     normally be considered). This is sufficient to ensure the
-*     eventual simplification of most Mapping sequences by repeated
-*     application of this function.
-*
-*     In some cases, the function may attempt more elaborate
-*     simplification, involving any number of other Mappings in the
-*     sequence. It is not restricted in the type or scope of
-*     simplification it may perform, but will normally only attempt
-*     elaborate simplification in cases where a more straightforward
-*     approach is not adequate.
-
-*  Parameters:
-*     this
-*        Pointer to the nominated GrismMap which is to be merged with
-*        its neighbours. This should be a cloned copy of the GrismMap
-*        pointer contained in the array element "(*map_list)[where]"
-*        (see below). This pointer will not be annulled, and the
-*        GrismMap it identifies will not be modified by this function.
-*     where
-*        Index in the "*map_list" array (below) at which the pointer
-*        to the nominated GrismMap resides.
-*     series
-*        A non-zero value indicates that the sequence of Mappings to
-*        be simplified will be applied in series (i.e. one after the
-*        other), whereas a zero value indicates that they will be
-*        applied in parallel (i.e. on successive sub-sets of the
-*        input/output coordinates).
-*     nmap
-*        Address of an int which counts the number of Mappings in the
-*        sequence. On entry this should be set to the initial number
-*        of Mappings. On exit it will be updated to record the number
-*        of Mappings remaining after simplification.
-*     map_list
-*        Address of a pointer to a dynamically allocated array of
-*        Mapping pointers (produced, for example, by the astMapList
-*        method) which identifies the sequence of Mappings. On entry,
-*        the initial sequence of Mappings to be simplified should be
-*        supplied.
-*
-*        On exit, the contents of this array will be modified to
-*        reflect any simplification carried out. Any form of
-*        simplification may be performed. This may involve any of: (a)
-*        removing Mappings by annulling any of the pointers supplied,
-*        (b) replacing them with pointers to new Mappings, (c)
-*        inserting additional Mappings and (d) changing their order.
-*
-*        The intention is to reduce the number of Mappings in the
-*        sequence, if possible, and any reduction will be reflected in
-*        the value of "*nmap" returned. However, simplifications which
-*        do not reduce the length of the sequence (but improve its
-*        execution time, for example) may also be performed, and the
-*        sequence might conceivably increase in length (but normally
-*        only in order to split up a Mapping into pieces that can be
-*        more easily merged with their neighbours on subsequent
-*        invocations of this function).
-*
-*        If Mappings are removed from the sequence, any gaps that
-*        remain will be closed up, by moving subsequent Mapping
-*        pointers along in the array, so that vacated elements occur
-*        at the end. If the sequence increases in length, the array
-*        will be extended (and its pointer updated) if necessary to
-*        accommodate any new elements.
-*
-*        Note that any (or all) of the Mapping pointers supplied in
-*        this array may be annulled by this function, but the Mappings
-*        to which they refer are not modified in any way (although
-*        they may, of course, be deleted if the annulled pointer is
-*        the final one).
-*     invert_list
-*        Address of a pointer to a dynamically allocated array which,
-*        on entry, should contain values to be assigned to the Invert
-*        attributes of the Mappings identified in the "*map_list"
-*        array before they are applied (this array might have been
-*        produced, for example, by the astMapList method). These
-*        values will be used by this function instead of the actual
-*        Invert attributes of the Mappings supplied, which are
-*        ignored.
-*
-*        On exit, the contents of this array will be updated to
-*        correspond with the possibly modified contents of the
-*        "*map_list" array.  If the Mapping sequence increases in
-*        length, the "*invert_list" array will be extended (and its
-*        pointer updated) if necessary to accommodate any new
-*        elements.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     If simplification was possible, the function returns the index
-*     in the "map_list" array of the first element which was
-*     modified. Otherwise, it returns -1 (and makes no changes to the
-*     arrays supplied).
-
-*  Notes:
-*     - A value of -1 will be returned if this function is invoked
-*     with the global error status set, or if it should fail for any
-*     reason.
-*/
-
-/* Local Variables: */
-   AstMapping *merged_map; /* Merger of two Mappings */
-   int i1;                 /* Lower index of the two GrismMaps being merged */
-   int i2;                 /* Upper index of the two GrismMaps being merged */
-   int i;                  /* Mapping index */
-   int result;             /* Result value to return */
-
-/* Initialise. */
-   result = -1;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Initialise variables to avoid "used of uninitialised variable"
-   messages from dumb compilers. */
-   i1 = -1;
-   i2 = -1;
-
-/* See if the GrismMap can be merged with the Mappings on either side of it
-   in the list. This can only be done in series for a GrismMap. */
-/* ===================================================================== */
-   if( series ) {
-
-/* Set a flag indicating that we have not yet found a neighbour with which
-   the GrismMap can be merged. */
-      merged_map = NULL;
-
-/* First check the lower neighbour (if any). */
-      if( where > 0 ) {
-         i1 = where - 1;
-         i2 = where;
-         merged_map = CanMerge( ( *map_list )[ i1 ], (* invert_list)[ i1 ],
-                                ( *map_list )[ i2 ], (* invert_list)[ i2 ], status );
-      }
-
-/* If the GrismMap can not be merged with its lower neighbour, check its
-   upper neighbour (if any) in the same way. */
-      if( !merged_map && where < *nmap - 1 ) {
-         i1 = where;
-         i2 = where + 1;
-         merged_map = CanMerge( ( *map_list )[ i1 ], (* invert_list)[ i1 ],
-                                ( *map_list )[ i2 ], (* invert_list)[ i2 ], status );
-      }
-
-/* If either neighbour has passed these checks, replace the pair of
-   Mappings which have been merged with the single merged Mapping returned
-   above. */
-      if( merged_map ) {
-
-/* Annul the two Mappings. */
-         (void) astAnnul( ( *map_list )[ i1 ] );
-         (void) astAnnul( ( *map_list )[ i2 ] );
-
-/* Store a pointer for the merged Mapping in place of the first of the
-   two replaced Mappings. */
-         ( *map_list )[ i1 ] = merged_map;
-         ( *invert_list )[ i1 ] = astGetInvert( merged_map );
-
-/* Shuffle down the remaining Mappings to fill the hole left by the
-   second of the replaced Mappings. */
-         for ( i = i2 + 1; i < *nmap; i++ ) {
-            ( *map_list )[ i - 1 ] = ( *map_list )[ i ];
-            ( *invert_list )[ i - 1 ] = ( *invert_list )[ i ];
-         }
-
-/* Clear the vacated element at the end. */
-         ( *map_list )[ *nmap - 1 ] = NULL;
-         ( *invert_list )[ *nmap - 1 ] = 0;
-
-/* Decrement the Mapping count and return the index of the first
-   modified element. */
-         (*nmap)--;
-         result = i1;
-
-      }
-   }
-
-/* Return the result. */
-   return result;
-}
-
-static void SetAttrib( AstObject *this_object, const char *setting, int *status ) {
-/*
-*  Name:
-*     SetAttrib
-
-*  Purpose:
-*     Set an attribute value for a GrismMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     void SetAttrib( AstObject *this, const char *setting )
-
-*  Class Membership:
-*     GrismMap member function (over-rides the astSetAttrib protected
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function assigns an attribute value for a GrismMap, the
-*     attribute and its value being specified by means of a string of
-*     the form:
-*
-*        "attribute= value "
-*
-*     Here, "attribute" specifies the attribute name and should be in
-*     lower case with no white space present. The value to the right
-*     of the "=" should be a suitable textual representation of the
-*     value to be assigned and this will be interpreted according to
-*     the attribute's data type.  White space surrounding the value is
-*     only significant for string attributes.
-
-*  Parameters:
-*     this
-*        Pointer to the GrismMap.
-*     setting
-*        Pointer to a null-terminated string specifying the new attribute
-*        value.
-*/
-
-/* Local Variables: */
-   AstGrismMap *this;            /* Pointer to the GrismMap structure */
-   double dval;                  /* Attribute value */
-   int len;                      /* Length of setting string */
-   int nc;                       /* Number of characters read by astSscanf */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Obtain a pointer to the GrismMap structure. */
-   this = (AstGrismMap *) this_object;
-
-/* Obtain the length of the setting string. */
-   len = (int) strlen( setting );
-
-/* Test for each recognised attribute in turn, using "astSscanf" to parse
-   the setting string and extract the attribute value (or an offset to
-   it in the case of string values). In each case, use the value set
-   in "nc" to check that the entire string was matched. Once a value
-   has been obtained, use the appropriate method to set it. */
-
-   if (  nc = 0, ( 1 == astSscanf( setting, "grismnr= %lf %n", &dval, &nc ) ) && ( nc >= len ) ) {
-      astSetGrismNR( this, dval );
-
-   } else if (  nc = 0, ( 1 == astSscanf( setting, "grismnrp= %lf %n", &dval, &nc ) ) && ( nc >= len ) ) {
-      astSetGrismNRP( this, dval );
-
-   } else if (  nc = 0, ( 1 == astSscanf( setting, "grismwaver= %lf %n", &dval, &nc ) ) && ( nc >= len ) ) {
-      astSetGrismWaveR( this, dval );
-
-   } else if (  nc = 0, ( 1 == astSscanf( setting, "grismalpha= %lf %n", &dval, &nc ) ) && ( nc >= len ) ) {
-      astSetGrismAlpha( this, dval );
-
-   } else if (  nc = 0, ( 1 == astSscanf( setting, "grismg= %lf %n", &dval, &nc ) ) && ( nc >= len ) ) {
-      astSetGrismG( this, dval );
-
-   } else if (  nc = 0, ( 1 == astSscanf( setting, "grismm= %lf %n", &dval, &nc ) ) && ( nc >= len ) ) {
-      astSetGrismM( this, dval );
-
-   } else if (  nc = 0, ( 1 == astSscanf( setting, "grismeps= %lf %n", &dval, &nc ) ) && ( nc >= len ) ) {
-      astSetGrismEps( this, dval );
-
-   } else if (  nc = 0, ( 1 == astSscanf( setting, "grismtheta= %lf %n", &dval, &nc ) ) && ( nc >= len ) ) {
-      astSetGrismTheta( this, dval );
-
-/* If the attribute is still not recognised, pass it on to the parent
-   method for further interpretation. */
-   } else {
-      (*parent_setattrib)( this_object, setting, status );
-   }
-}
-
-static int TestAttrib( AstObject *this_object, const char *attrib, int *status ) {
-/*
-*  Name:
-*     TestAttrib
-
-*  Purpose:
-*     Test if a specified attribute value is set for a GrismMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     int TestAttrib( AstObject *this, const char *attrib, int *status )
-
-*  Class Membership:
-*     GrismMap member function (over-rides the astTestAttrib protected
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function returns a boolean result (0 or 1) to indicate whether
-*     a value has been set for one of a GrismMap's attributes.
-
-*  Parameters:
-*     this
-*        Pointer to the GrismMap.
-*     attrib
-*        Pointer to a null-terminated string specifying the attribute
-*        name.  This should be in lower case with no surrounding white
-*        space.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     One if a value has been set, otherwise zero.
-
-*  Notes:
-*     - A value of zero will be returned if this function is invoked
-*     with the global status set, or if it should fail for any reason.
-*/
-
-/* Local Variables: */
-   AstGrismMap *this;             /* Pointer to the GrismMap structure */
-   int result;                   /* Result value to return */
-
-/* Initialise. */
-   result = 0;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Obtain a pointer to the GrismMap structure. */
-   this = (AstGrismMap *) this_object;
-
-/* Check the attribute name and clear the appropriate attribute. */
-   if ( !strcmp( attrib, "grismnr" ) ) {
-      result = astTestGrismNR( this );
-
-   } else if ( !strcmp( attrib, "grismnrp" ) ) {
-      result = astTestGrismNRP( this );
-
-   } else if ( !strcmp( attrib, "grismwaver" ) ) {
-      result = astTestGrismWaveR( this );
-
-   } else if ( !strcmp( attrib, "grismalpha" ) ) {
-      result = astTestGrismAlpha( this );
-
-   } else if ( !strcmp( attrib, "grismg" ) ) {
-      result = astTestGrismG( this );
-
-   } else if ( !strcmp( attrib, "grismm" ) ) {
-      result = astTestGrismM( this );
-
-   } else if ( !strcmp( attrib, "grismeps" ) ) {
-      result = astTestGrismEps( this );
-
-   } else if ( !strcmp( attrib, "grismtheta" ) ) {
-      result = astTestGrismTheta( this );
-
-/* If the attribute is still not recognised, pass it on to the parent
-   method for further interpretation. */
-   } else {
-      result = (*parent_testattrib)( this_object, attrib, status );
-   }
-
-/* Return the result, */
-   return result;
-}
-
-static AstPointSet *Transform( AstMapping *this, AstPointSet *in,
-                               int forward, AstPointSet *out, int *status ) {
-/*
-*  Name:
-*     Transform
-
-*  Purpose:
-*     Apply a GrismMap to transform a set of points.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     AstPointSet *Transform( AstMapping *this, AstPointSet *in,
-*                             int forward, AstPointSet *out, int *status )
-
-*  Class Membership:
-*     GrismMap member function (over-rides the astTransform protected
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function takes a GrismMap and a set of points encapsulated
-*     in a PointSet and transforms the points so as to apply the
-*     forward or inverse dispersal equation.
-
-*  Parameters:
-*     this
-*        Pointer to the GrismMap.
-*     in
-*        Pointer to the PointSet holding the input coordinate data.
-*     forward
-*        A non-zero value indicates that the forward coordinate
-*        transformation should be applied, while a zero value requests
-*        the inverse transformation.
-*     out
-*        Pointer to a PointSet which will hold the transformed
-*        (output) coordinate values. A NULL value may also be given,
-*        in which case a new PointSet will be created by this
-*        function.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     Pointer to the output (possibly new) PointSet.
-
-*  Notes:
-*     - A null pointer will be returned if this function is invoked
-*     with the global error status set, or if it should fail for any
-*     reason.
-*     - The number of coordinate values per point in the input
-*     PointSet must equal 1.
-*     - If an output PointSet is supplied, it must have space for
-*     sufficient number of points (with 1 coordinate value per point)
-*     to accommodate the result. Any excess space will be ignored.
-*/
-
-/* Local Variables: */
-   AstGrismMap *map;             /* Pointer to GrismMap to be applied */
-   AstPointSet *result;          /* Pointer to output PointSet */
-   double **ptr_in;              /* Pointer to input coordinate data */
-   double **ptr_out;             /* Pointer to output coordinate data */
-   double sinbeta;               /* Sin( beta ) (see FITS-WCS paper III) */
-   double value_in;              /* Input coordinate value */
-   int npoint;                   /* Number of points */
-   int point;                    /* Loop counter for points */
-
-/* Check the global error status. */
-   if ( !astOK ) return NULL;
-
-/* Obtain a pointer to the GrismMap. */
-   map = (AstGrismMap *) this;
-
-/* Apply the parent mapping using the stored pointer to the Transform
-   member function inherited from the parent Mapping class. This
-   function validates all arguments and generates an output PointSet
-   if necessary, but does not actually transform any coordinate
-   values. */
-   result = (*parent_transform)( this, in, forward, out, status );
-
-/* We will now extend the parent astTransform method by performing the
-   calculations needed to generate the output coordinate values. */
-
-/* Determine the numbers of points from the input PointSet and obtain
-   pointers for accessing the input and output coordinate values. */
-   npoint = astGetNpoint( in );
-   ptr_in = astGetPoints( in );
-   ptr_out = astGetPoints( result );
-
-/* Determine whether to apply the forward or inverse mapping,
-   according to the direction specified and whether the mapping has
-   been inverted. */
-   if ( astGetInvert( map ) ) forward = !forward;
-
-/* If any of the parameters are undefined fill the output with bad
-   values (if possible). */
-   if( map->k1 == AST__BAD || map->k2 == AST__BAD || map->k3 == AST__BAD ) {
-      if( astOK ) {
-         for ( point = 0; point < npoint; point++ ) {
-            ptr_out[ 0 ][ point ] = AST__BAD;
-         }
-      }
-
-/* Otherwise... */
-   } else {
-
-/* Forward transformation. */
-/* ----------------------- */
-      if ( forward ) {
-
-/* Loop to transform each input point. */
-         for ( point = 0; point < npoint; point++ ) {
-
-/* Extract the input grism parameter value. */
-            value_in = ptr_in[ 0 ][ point ];
-
-/* Check for bad input coordinates and generate a bad result if necessary. */
-            if( value_in == AST__BAD || map->k2 == 0.0 ) {
-               ptr_out[ 0 ][ point ] = AST__BAD;
-
-/* Otherwise, apply the algorithm described in FITS-WCS paper III. */
-            } else {
-               ptr_out[ 0 ][ point ] = ( map->k1 + sin( atan( value_in ) + map->k3 ) )/map->k2;
-            }
-         }
-
-/* Inverse transformation. */
-/* ----------------------- */
-      } else {
-
-/* Loop to transform each input point. */
-         for ( point = 0; point < npoint; point++ ) {
-
-/* Extract the input wavelength value. */
-            value_in = ptr_in[ 0 ][ point ];
-
-/* Check for bad input coordinates and generate a bad result if necessary. */
-            if ( value_in == AST__BAD ) {
-               ptr_out[ 0 ][ point ] = AST__BAD;
-
-/* Otherwise, apply the algorithm described in FITS-WCS paper III. */
-            } else {
-               sinbeta = map->k2*value_in - map->k1;
-               if( sinbeta < -1.0 || sinbeta > 1.0 ) {
-                  ptr_out[ 0 ][ point ] = AST__BAD;
-               } else {
-                  ptr_out[ 0 ][ point ] = tan( asin( sinbeta ) - map->k3 );
-               }
-            }
-         }
-      }
-   }
-
-/* Return a pointer to the output PointSet. */
-   return result;
-}
-
-
-static void UpdateConstants( AstGrismMap *this, int *status ){
-/*
-*  Name:
-*     UpdateConstants
-
-*  Purpose:
-*     Re-calculate the constants used within the transformation.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     void UpdateConstants( AstGrismMap *this, int *status )
-
-*  Class Membership:
-*     GrismMap member function
-
-*  Description:
-*     This function re-calculates the constants used within the
-*     transformation on the basis of the current values of the
-*     GrismMap attributes. It should be called whenever a new value is
-*     set for an attribute, or an attribute is cleared.
-
-*  Parameters:
-*     this
-*        Pointer to the GrismMap.
-*     status
-*        Pointer to the inherited status variable.
-
-*/
-
-/* Local Variables: */
-   double alpha;        /* The current vaue of the GrismAlpha attribute */
-   double coseps;       /* cos( eps ) */
-   double sinalpha;     /* sin( alpha ) */
-   double eps;          /* The current vaue of the GrismEps attribute */
-   double g;            /* The current vaue of the GrismG attribute */
-   double nr;           /* The current vaue of the GrismNR attribute */
-   double nrp;          /* The current vaue of the GrismNRP attribute */
-   double sinbeta_r;    /* sin( beta_r ) */
-   double theta;        /* The current vaue of the GrismTheta attribute */
-   double wave_r;       /* The current vaue of the GrismWaveR attribute */
-   int m;               /* The current vaue of the GrismM attribute */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Get the current attribute values. */
-   nr = astGetGrismNR( this );
-   nrp = astGetGrismNRP( this );
-   wave_r = astGetGrismWaveR( this );
-   alpha = astGetGrismAlpha( this );
-   g = astGetGrismG( this );
-   m = astGetGrismM( this );
-   eps = astGetGrismEps( this );
-   theta = astGetGrismTheta( this );
-
-/* Re-calculate the constants. */
-   coseps = cos( eps );
-   sinalpha = sin( alpha );
-
-   this->k1 = sinalpha*( nr - nrp*wave_r );
-
-   if( coseps != 0.0 ) {
-      this->k2 = ( g*m/coseps ) - nrp*sinalpha;
-
-      sinbeta_r = g*m*wave_r/coseps - nr*sinalpha;
-      if( sinbeta_r < -1.0 || sinbeta_r > 1.0 ) {
-         this->k3 = AST__BAD;
-      } else {
-         this->k3 = asin( sinbeta_r ) + theta;
-      }
-
-   } else {
-      this->k2 = AST__BAD;
-      this->k3 = AST__BAD;
-   }
-
-}
-
-/* Functions which access class attributes. */
-/* ---------------------------------------- */
-/* Implement member functions to access the attributes associated with
-   this class using the macros defined for this purpose in the
-   "object.h" file. For a description of each attribute, see the class
-   interface (in the associated .h file). */
-
-/*
-*att++
-*  Name:
-*     GrismNR
-
-*  Purpose:
-*     The refractive index at the reference wavelength.
-
-*  Type:
-*     Public attribute.
-
-*  Synopsis:
-*     Double precision.
-
-*  Description:
-*     This attribute holds refractive index of the grism material at the
-*     reference wavelength (given by attribute GrismWaveR). The default
-*     value is 1.0.
-*
-*     Note, the value of this attribute may changed only if the GrismMap
-*     has no more than one reference. That is, an error is reported if the
-*     GrismMap has been cloned, either by including it within another object
-*     such as a CmpMap or FrameSet or by calling the
-c     astClone
-f     AST_CLONE
-*     function.
-
-*  Applicability:
-*     GrismMap
-*        All GrismMaps have this attribute.
-
-*att--
-*/
-MAKE_CLEAR(GrismMap,GrismNR,nr,(AST__BAD))
-astMAKE_GET(GrismMap,GrismNR,double,1.0,( ( this->nr == AST__BAD ) ?
-                                      1.0 : this->nr ))
-MAKE_SET(GrismMap,GrismNR,double,nr,(value) )
-astMAKE_TEST(GrismMap,GrismNR,( this->nr != AST__BAD ))
-
-/*
-*att++
-*  Name:
-*     GrismNRP
-
-*  Purpose:
-*     The rate of change of refractive index with wavelength.
-
-*  Type:
-*     Public attribute.
-
-*  Synopsis:
-*     Double precision.
-
-*  Description:
-*     This attribute holds the rate of change of the refractive index of the
-*     grism material with respect to wavelength at the reference wavelength
-*     (given by attribute GrismWaveR). The default value is 0.0 (the
-*     appropriate value for a pure grating disperser with no prism). The
-*     units of this attribute should be consistent with those of attributes
-*     GrismWaveR and GrismG.
-*
-*     Note, the value of this attribute may changed only if the GrismMap
-*     has no more than one reference. That is, an error is reported if the
-*     GrismMap has been cloned, either by including it within another object
-*     such as a CmpMap or FrameSet or by calling the
-c     astClone
-f     AST_CLONE
-*     function.
-
-*  Applicability:
-*     GrismMap
-*        All GrismMaps have this attribute.
-
-*att--
-*/
-MAKE_CLEAR(GrismMap,GrismNRP,nrp,(AST__BAD))
-astMAKE_GET(GrismMap,GrismNRP,double,0.0,( ( this->nrp == AST__BAD ) ?
-                                      0.0 : this->nrp ))
-MAKE_SET(GrismMap,GrismNRP,double,nrp,(value) )
-astMAKE_TEST(GrismMap,GrismNRP,( this->nrp != AST__BAD ))
-
-/*
-*att++
-*  Name:
-*     GrismWaveR
-
-*  Purpose:
-*     The reference wavelength.
-
-*  Type:
-*     Public attribute.
-
-*  Synopsis:
-*     Double precision.
-
-*  Description:
-*     This attribute holds reference wavelength. The default value is
-*     5000 (Angstrom). The units of this attribute should be consistent with
-*     those of attributes GrismNRP and GrismG.
-*
-*     Note, the value of this attribute may changed only if the GrismMap
-*     has no more than one reference. That is, an error is reported if the
-*     GrismMap has been cloned, either by including it within another object
-*     such as a CmpMap or FrameSet or by calling the
-c     astClone
-f     AST_CLONE
-*     function.
-
-*  Applicability:
-*     GrismMap
-*        All GrismMaps have this attribute.
-
-*att--
-*/
-MAKE_CLEAR(GrismMap,GrismWaveR,waver,(AST__BAD))
-astMAKE_GET(GrismMap,GrismWaveR,double,5000.0,( ( this->waver == AST__BAD ) ?
-                                      5000.0 : this->waver ))
-MAKE_SET(GrismMap,GrismWaveR,double,waver,(value) )
-astMAKE_TEST(GrismMap,GrismWaveR,( this->waver != AST__BAD ))
-
-/*
-*att++
-*  Name:
-*     GrismAlpha
-
-*  Purpose:
-*     The angle of incidence of the incoming light on the grating surface.
-
-*  Type:
-*     Public attribute.
-
-*  Synopsis:
-*     Double precision.
-
-*  Description:
-*     This attribute holds the angle between the incoming light and the
-*     normal to the grating surface, in radians. The default value is 0.
-*
-*     Note, the value of this attribute may changed only if the GrismMap
-*     has no more than one reference. That is, an error is reported if the
-*     GrismMap has been cloned, either by including it within another object
-*     such as a CmpMap or FrameSet or by calling the
-c     astClone
-f     AST_CLONE
-*     function.
-
-*  Applicability:
-*     GrismMap
-*        All GrismMaps have this attribute.
-
-*att--
-*/
-MAKE_CLEAR(GrismMap,GrismAlpha,alpha,(AST__BAD))
-astMAKE_GET(GrismMap,GrismAlpha,double,0.0,( ( this->alpha == AST__BAD ) ?
-                                       0.0 : this->alpha ))
-MAKE_SET(GrismMap,GrismAlpha,double,alpha,(value) )
-astMAKE_TEST(GrismMap,GrismAlpha,( this->alpha != AST__BAD ))
-
-/*
-*att++
-*  Name:
-*     GrismG
-
-*  Purpose:
-*     The grating ruling density.
-
-*  Type:
-*     Public attribute.
-
-*  Synopsis:
-*     Double precision.
-
-*  Description:
-*     This attribute holds the number of grating rulings per unit length.
-*     The unit of length used should be consistent with the units used
-*     for attributes GrismWaveR and GrismNRP. The default value is 0.0.
-*     (the appropriate value for a pure prism disperser with no grating).
-*
-*     Note, the value of this attribute may changed only if the GrismMap
-*     has no more than one reference. That is, an error is reported if the
-*     GrismMap has been cloned, either by including it within another object
-*     such as a CmpMap or FrameSet or by calling the
-c     astClone
-f     AST_CLONE
-*     function.
-
-*  Applicability:
-*     GrismMap
-*        All GrismMaps have this attribute.
-
-*att--
-*/
-MAKE_CLEAR(GrismMap,GrismG,g,(AST__BAD))
-astMAKE_GET(GrismMap,GrismG,double,0.0,( ( this->g == AST__BAD ) ?
-                                      0.0 : this->g ))
-MAKE_SET(GrismMap,GrismG,double,g,(value) )
-astMAKE_TEST(GrismMap,GrismG,( this->g != AST__BAD ))
-
-/*
-*att++
-*  Name:
-*     GrismM
-
-*  Purpose:
-*     The interference order
-
-*  Type:
-*     Public attribute.
-
-*  Synopsis:
-*     Integer.
-
-*  Description:
-*     This attribute holds the interference order being considered.
-*     The default value is 0.
-*
-*     Note, the value of this attribute may changed only if the GrismMap
-*     has no more than one reference. That is, an error is reported if the
-*     GrismMap has been cloned, either by including it within another object
-*     such as a CmpMap or FrameSet or by calling the
-c     astClone
-f     AST_CLONE
-*     function.
-
-*  Applicability:
-*     GrismMap
-*        All GrismMaps have this attribute.
-
-*att--
-*/
-MAKE_CLEAR(GrismMap,GrismM,m,(INT_MAX))
-astMAKE_GET(GrismMap,GrismM,int,0,( ( this->m == INT_MAX ) ?
-                                      0 : this->m ))
-MAKE_SET(GrismMap,GrismM,int,m,(value) )
-astMAKE_TEST(GrismMap,GrismM,( this->m != INT_MAX ))
-
-/*
-*att++
-*  Name:
-*     GrismEps
-
-*  Purpose:
-*      The angle between the normal and the dispersion plane.
-
-*  Type:
-*     Public attribute.
-
-*  Synopsis:
-*     Double precision.
-
-*  Description:
-*     This attribute holds the angle (in radians) between the normal to
-*     the grating or exit prism face, and the dispersion plane. The
-*     dispersion plane is the plane spanned by the incoming and outgoing
-*     ray. The default value is 0.0.
-*
-*     Note, the value of this attribute may changed only if the GrismMap
-*     has no more than one reference. That is, an error is reported if the
-*     GrismMap has been cloned, either by including it within another object
-*     such as a CmpMap or FrameSet or by calling the
-c     astClone
-f     AST_CLONE
-*     function.
-
-*  Applicability:
-*     GrismMap
-*        All GrismMaps have this attribute.
-
-*att--
-*/
-MAKE_CLEAR(GrismMap,GrismEps,eps,(AST__BAD))
-astMAKE_GET(GrismMap,GrismEps,double,0.0,( ( this->eps == AST__BAD ) ?
-                                      0.0 : this->eps ))
-MAKE_SET(GrismMap,GrismEps,double,eps,(value) )
-astMAKE_TEST(GrismMap,GrismEps,( this->eps != AST__BAD ))
-
-/*
-*att++
-*  Name:
-*     GrismTheta
-
-*  Purpose:
-*     Angle between normal to detector plane and reference ray.
-
-*  Type:
-*     Public attribute.
-
-*  Synopsis:
-*     Double precision.
-
-*  Description:
-*     This attribute gives the angle of incidence of light of the
-*     reference wavelength (given by attribute GrismWaveR) onto the
-*     detector. Specifically, it holds the angle (in radians) between
-*     the normal to the detector plane and an incident ray at the reference
-*     wavelength. The default value is 0.0.
-*
-*     Note, the value of this attribute may changed only if the GrismMap
-*     has no more than one reference. That is, an error is reported if the
-*     GrismMap has been cloned, either by including it within another object
-*     such as a CmpMap or FrameSet or by calling the
-c     astClone
-f     AST_CLONE
-*     function.
-
-*  Applicability:
-*     GrismMap
-*        All GrismMaps have this attribute.
-
-*att--
-*/
-MAKE_CLEAR(GrismMap,GrismTheta,theta,(AST__BAD))
-astMAKE_GET(GrismMap,GrismTheta,double,0.0,( ( this->theta == AST__BAD ) ?
-                                      0.0 : this->theta ))
-MAKE_SET(GrismMap,GrismTheta,double,theta,(value) )
-astMAKE_TEST(GrismMap,GrismTheta,( this->theta != AST__BAD ))
-
-/* Copy constructor. */
-/* ----------------- */
-/* No copy constructor is needed, as a byte-by-byte copy suffices. */
-
-/* Destructor. */
-/* ----------- */
-/* No destructor is needed as no memory, etc. needs freeing. */
-
-/* Dump function. */
-/* -------------- */
-static void Dump( AstObject *this_object, AstChannel *channel, int *status ) {
-/*
-*  Name:
-*     Dump
-
-*  Purpose:
-*     Dump function for GrismMap objects.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     void Dump( AstObject *this, AstChannel *channel, int *status )
-
-*  Description:
-*     This function implements the Dump function which writes out data
-*     for the GrismMap class to an output Channel.
-
-*  Parameters:
-*     this
-*        Pointer to the GrismMap whose data are being written.
-*     channel
-*        Pointer to the Channel to which the data are being written.
-*     status
-*        Pointer to the inherited status variable.
-*/
-
-/* Local Variables: */
-   AstGrismMap *this;            /* Pointer to the GrismMap structure */
-   double dval;                  /* Double value */
-   int set;                      /* Attribute value set? */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Obtain a pointer to the GrismMap structure. */
-   this = (AstGrismMap *) this_object;
-
-/* Write out values representing the instance variables for the
-   GrismMap class.  Accompany these with appropriate comment strings,
-   possibly depending on the values being written.*/
-
-/* In the case of attributes, we first use the appropriate (private)
-   Test...  member function to see if they are set. If so, we then use
-   the (private) Get... function to obtain the value to be written
-   out.
-
-   For attributes which are not set, we use the astGet... method to
-   obtain the value instead. This will supply a default value
-   (possibly provided by a derived class which over-rides this method)
-   which is more useful to a human reader as it corresponds to the
-   actual default attribute value.  Since "set" will be zero, these
-   values are for information only and will not be read back. */
-
-   set = TestGrismNR( this, status );
-   dval = set ? GetGrismNR( this, status ) : astGetGrismNR( this );
-   astWriteDouble( channel, "GrmNR", set, 1, dval, "Refractive index at the ref. wavelength" );
-
-   set = TestGrismNRP( this, status );
-   dval = set ? GetGrismNRP( this, status ) : astGetGrismNRP( this );
-   astWriteDouble( channel, "GrmNRP", set, 1, dval, "Rate of change of refractive index" );
-
-   set = TestGrismWaveR( this, status );
-   dval = set ? GetGrismWaveR( this, status ) : astGetGrismWaveR( this );
-   astWriteDouble( channel, "GrmWR", set, 1, dval, "Ref. wavelength" );
-
-   set = TestGrismAlpha( this, status );
-   dval = set ? GetGrismAlpha( this, status ) : astGetGrismAlpha( this );
-   astWriteDouble( channel, "GrmAlp", set, 1, dval, "Angle of incidence of incoming light" );
-
-   set = TestGrismG( this, status );
-   dval = set ? GetGrismG( this, status ) : astGetGrismG( this );
-   astWriteDouble( channel, "GrmG", set, 1, dval, "Grating ruling density" );
-
-   set = TestGrismM( this, status );
-   dval = set ? GetGrismM( this, status ) : astGetGrismM( this );
-   astWriteDouble( channel, "GrmM", set, 1, dval, "The interference order" );
-
-   set = TestGrismEps( this, status );
-   dval = set ? GetGrismEps( this, status ) : astGetGrismEps( this );
-   astWriteDouble( channel, "GrmEps", set, 1, dval, "Angle between grating normal and dispersion plane" );
-
-   set = TestGrismTheta( this, status );
-   dval = set ? GetGrismTheta( this, status ) : astGetGrismTheta( this );
-   astWriteDouble( channel, "GrmTh", set, 1, dval, "Angle between detector normal and reference ray" );
-
-}
-
-
-/* Standard class functions. */
-/* ========================= */
-/* Implement the astIsAGrismMap and astCheckGrismMap functions using the
-   macros defined for this purpose in the "object.h" header file. */
-astMAKE_ISA(GrismMap,Mapping)
-astMAKE_CHECK(GrismMap)
-
-AstGrismMap *astGrismMap_( const char *options, int *status, ...) {
-/*
-*++
-*  Name:
-c     astGrismMap
-f     AST_GRISMMAP
-
-*  Purpose:
-*     Create a GrismMap.
-
-*  Type:
-*     Public function.
-
-*  Synopsis:
-c     #include "grismmap.h"
-c     AstGrismMap *astGrismMap( const char *options, ... )
-f     RESULT = AST_GRISMMAP( OPTIONS, STATUS )
-
-*  Class Membership:
-*     GrismMap constructor.
-
-*  Description:
-*     This function creates a new GrismMap and optionally initialises
-*     its attributes.
-*
-*     A GrismMap is a specialised form of Mapping which transforms
-*     1-dimensional coordinates using the spectral dispersion equation
-*     described in FITS-WCS paper III "Representation of spectral
-*     coordinates in FITS". This describes the dispersion produced by
-*     gratings, prisms and grisms.
-*
-*     When initially created, the forward transformation of a GrismMap
-*     transforms input "grism parameter" values into output wavelength
-*     values. The "grism parameter" is a dimensionless value which is
-*     linearly related to position on the detector. It is defined in FITS-WCS
-*     paper III as "the offset on the detector from the point of intersection
-*     of the camera axis, measured in units of the effective local length".
-*     The units in which wavelength values are expected or returned is
-*     determined by the values supplied for the GrismWaveR, GrismNRP and
-*     GrismG attribute: whatever units are used for these attributes will
-*     also be used for the wavelength values.
-
-*  Parameters:
-c     options
-f     OPTIONS = CHARACTER * ( * ) (Given)
-c        Pointer to a null-terminated string containing an optional
-c        comma-separated list of attribute assignments to be used for
-c        initialising the new GrismMap. The syntax used is identical to
-c        that for the astSet function and may include "printf" format
-c        specifiers identified by "%" symbols in the normal way.
-f        A character string containing an optional comma-separated
-f        list of attribute assignments to be used for initialising the
-f        new GrismMap. The syntax used is identical to that for the
-f        AST_SET routine.
-c     ...
-c        If the "options" string contains "%" format specifiers, then
-c        an optional list of additional arguments may follow it in
-c        order to supply values to be substituted for these
-c        specifiers. The rules for supplying these are identical to
-c        those for the astSet function (and for the C "printf"
-c        function).
-f     STATUS = INTEGER (Given and Returned)
-f        The global status.
-
-*  Returned Value:
-c     astGrismMap()
-f     AST_GRISMMAP = INTEGER
-*        A pointer to the new GrismMap.
-
-*  Notes:
-*     - A null Object pointer (AST__NULL) will be returned if this
-c     function is invoked with the AST error status set, or if it
-f     function is invoked with STATUS set to an error value, or if it
-*     should fail for any reason.
-*--
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstGrismMap *new;             /* Pointer to new GrismMap */
-   va_list args;                 /* Variable argument list */
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(NULL);
-
-/* Check the global status. */
-   if ( !astOK ) return NULL;
-
-/* Initialise the GrismMap, allocating memory and initialising the
-   virtual function table as well if necessary. */
-   new = astInitGrismMap( NULL, sizeof( AstGrismMap ), !class_init,
-                          &class_vtab, "GrismMap" );
-
-/* If successful, note that the virtual function table has been
-   initialised. */
-   if ( astOK ) {
-      class_init = 1;
-
-/* Obtain the variable argument list and pass it along with the
-   options string to the astVSet method to initialise the new
-   GrismMap's attributes. */
-      va_start( args, status );
-      astVSet( new, options, NULL, args );
-      va_end( args );
-
-/* If an error occurred, clean up by deleting the new object. */
-      if ( !astOK ) new = astDelete( new );
-   }
-
-/* Return a pointer to the new GrismMap. */
-   return new;
-}
-
-AstGrismMap *astGrismMapId_( const char *options, ... ) {
-/*
-*  Name:
-*     astGrismMapId_
-
-*  Purpose:
-*     Create a GrismMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     AstGrismMap *astGrismMapId( const char *options, int *status, ... )
-
-*  Class Membership:
-*     GrismMap constructor.
-
-*  Description:
-*     This function implements the external (public) interface to the
-*     astGrismMap constructor function. It returns an ID value (instead
-*     of a true C pointer) to external users, and must be provided
-*     because astGrismMap_ has a variable argument list which cannot be
-*     encapsulated in a macro (where this conversion would otherwise
-*     occur).
-*
-*     The variable argument list also prevents this function from
-*     invoking astGrismMap_ directly, so it must be a re-implementation
-*     of it in all respects, except for the final conversion of the
-*     result to an ID value.
-
-*  Parameters:
-*     As for astGrismMap_.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     The ID value associated with the new GrismMap.
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstGrismMap *new;             /* Pointer to new GrismMap */
-   va_list args;                 /* Variable argument list */
-
-   int *status;                  /* Pointer to inherited status value */
-
-/* Get a pointer to the inherited status value. */
-   status = astGetStatusPtr;
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(NULL);
-
-/* Check the global status. */
-   if ( !astOK ) return NULL;
-
-/* Initialise the GrismMap, allocating memory and initialising the
-   virtual function table as well if necessary. */
-   new = astInitGrismMap( NULL, sizeof( AstGrismMap ), !class_init,
-                          &class_vtab, "GrismMap" );
-
-/* If successful, note that the virtual function table has been
-   initialised. */
-   if ( astOK ) {
-      class_init = 1;
-
-/* Obtain the variable argument list and pass it along with the
-   options string to the astVSet method to initialise the new GrismMap's
-   attributes. */
-      va_start( args, options );
-      astVSet( new, options, NULL, args );
-      va_end( args );
-
-/* If an error occurred, clean up by deleting the new object. */
-      if ( !astOK ) new = astDelete( new );
-   }
-
-/* Return an ID value for the new GrismMap. */
-   return astMakeId( new );
-}
-
-AstGrismMap *astInitGrismMap_( void *mem, size_t size, int init,
-                               AstGrismMapVtab *vtab, const char *name, int *status ) {
-/*
-*+
-*  Name:
-*     astInitGrismMap
-
-*  Purpose:
-*     Initialise a GrismMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     AstGrismMap *astInitGrismMap( void *mem, size_t size, int init,
-*                                   AstGrismMapVtab *vtab, const char *name )
-
-*  Class Membership:
-*     GrismMap initialiser.
-
-*  Description:
-*     This function is provided for use by class implementations to initialise
-*     a new GrismMap object. It allocates memory (if necessary) to accommodate
-*     the GrismMap plus any additional data associated with the derived class.
-*     It then initialises a GrismMap structure at the start of this memory. If
-*     the "init" flag is set, it also initialises the contents of a virtual
-*     function table for a GrismMap at the start of the memory passed via the
-*     "vtab" parameter.
-
-*  Parameters:
-*     mem
-*        A pointer to the memory in which the GrismMap is to be initialised.
-*        This must be of sufficient size to accommodate the GrismMap data
-*        (sizeof(GrismMap)) plus any data used by the derived class. If a value
-*        of NULL is given, this function will allocate the memory itself using
-*        the "size" parameter to determine its size.
-*     size
-*        The amount of memory used by the GrismMap (plus derived class data).
-*        This will be used to allocate memory if a value of NULL is given for
-*        the "mem" parameter. This value is also stored in the GrismMap
-*        structure, so a valid value must be supplied even if not required for
-*        allocating memory.
-*     init
-*        A logical flag indicating if the GrismMap's virtual function table is
-*        to be initialised. If this value is non-zero, the virtual function
-*        table will be initialised by this function.
-*     vtab
-*        Pointer to the start of the virtual function table to be associated
-*        with the new GrismMap.
-*     name
-*        Pointer to a constant null-terminated character string which contains
-*        the name of the class to which the new object belongs (it is this
-*        pointer value that will subsequently be returned by the astGetClass
-*        method).
-
-*  Returned Value:
-*     A pointer to the new GrismMap.
-
-*  Notes:
-*     -  A null pointer will be returned if this function is invoked with the
-*     global error status set, or if it should fail for any reason.
-*-
-*/
-
-/* Local Variables: */
-   AstGrismMap *new;              /* Pointer to new GrismMap */
-
-/* Check the global status. */
-   if ( !astOK ) return NULL;
-
-/* If necessary, initialise the virtual function table. */
-   if ( init ) astInitGrismMapVtab( vtab, name );
-
-/* Initialise. */
-   new = NULL;
-
-/* Initialise a Mapping structure (the parent class) as the first component
-   within the GrismMap structure, allocating memory if necessary. Specify that
-   the Mapping should be defined in both the forward and inverse directions. */
-   new = (AstGrismMap *) astInitMapping( mem, size, 0,
-                                         (AstMappingVtab *) vtab, name,
-                                         1, 1, 1, 1 );
-   if ( astOK ) {
-
-/* Initialise the GrismMap data. */
-/* ---------------------------- */
-      new->nr    = AST__BAD;
-      new->nrp   = AST__BAD;
-      new->waver = AST__BAD;
-      new->alpha = AST__BAD;
-      new->g     = AST__BAD;
-      new->m     = INT_MAX;
-      new->eps   = AST__BAD;
-      new->theta = AST__BAD;
-
-/* Set up the other required derived constants. */
-      UpdateConstants( new, status );
-
-/* If an error occurred, clean up by deleting the new GrismMap. */
-      if ( !astOK ) new = astDelete( new );
-   }
-
-/* Return a pointer to the new GrismMap. */
-   return new;
-}
-
-AstGrismMap *astLoadGrismMap_( void *mem, size_t size,
-                           AstGrismMapVtab *vtab, const char *name,
-                           AstChannel *channel, int *status ) {
-/*
-*+
-*  Name:
-*     astLoadGrismMap
-
-*  Purpose:
-*     Load a GrismMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "grismmap.h"
-*     AstGrismMap *astLoadGrismMap( void *mem, size_t size,
-*                               AstGrismMapVtab *vtab, const char *name,
-*                               AstChannel *channel )
-
-*  Class Membership:
-*     GrismMap loader.
-
-*  Description:
-*     This function is provided to load a new GrismMap using data read
-*     from a Channel. It first loads the data used by the parent class
-*     (which allocates memory if necessary) and then initialises a
-*     GrismMap structure in this memory, using data read from the input
-*     Channel.
-*
-*     If the "init" flag is set, it also initialises the contents of a
-*     virtual function table for a GrismMap at the start of the memory
-*     passed via the "vtab" parameter.
-
-
-*  Parameters:
-*     mem
-*        A pointer to the memory into which the GrismMap is to be
-*        loaded.  This must be of sufficient size to accommodate the
-*        GrismMap data (sizeof(GrismMap)) plus any data used by derived
-*        classes. If a value of NULL is given, this function will
-*        allocate the memory itself using the "size" parameter to
-*        determine its size.
-*     size
-*        The amount of memory used by the GrismMap (plus derived class
-*        data).  This will be used to allocate memory if a value of
-*        NULL is given for the "mem" parameter. This value is also
-*        stored in the GrismMap structure, so a valid value must be
-*        supplied even if not required for allocating memory.
-*
-*        If the "vtab" parameter is NULL, the "size" value is ignored
-*        and sizeof(AstGrismMap) is used instead.
-*     vtab
-*        Pointer to the start of the virtual function table to be
-*        associated with the new GrismMap. If this is NULL, a pointer
-*        to the (static) virtual function table for the GrismMap class
-*        is used instead.
-*     name
-*        Pointer to a constant null-terminated character string which
-*        contains the name of the class to which the new object
-*        belongs (it is this pointer value that will subsequently be
-*        returned by the astGetClass method).
-*
-*        If the "vtab" parameter is NULL, the "name" value is ignored
-*        and a pointer to the string "GrismMap" is used instead.
-
-*  Returned Value:
-*     A pointer to the new GrismMap.
-
-*  Notes:
-*     - A null pointer will be returned if this function is invoked
-*     with the global error status set, or if it should fail for any
-*     reason.
-*-
-*/
-
-/* Local Constants: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-#define KEY_LEN 50               /* Maximum length of a keyword */
-
-/* Local Variables: */
-   AstGrismMap *new;             /* Pointer to the new GrismMap */
-
-/* Initialise. */
-   new = NULL;
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(channel);
-
-/* Check the global error status. */
-   if ( !astOK ) return new;
-
-/* If a NULL virtual function table has been supplied, then this is
-   the first loader to be invoked for this GrismMap. In this case the
-   GrismMap belongs to this class, so supply appropriate values to be
-   passed to the parent class loader (and its parent, etc.). */
-   if ( !vtab ) {
-      size = sizeof( AstGrismMap );
-      vtab = &class_vtab;
-      name = "GrismMap";
-
-/* If required, initialise the virtual function table for this class. */
-      if ( !class_init ) {
-         astInitGrismMapVtab( vtab, name );
-         class_init = 1;
-      }
-   }
-
-/* Invoke the parent class loader to load data for all the ancestral
-   classes of the current one, returning a pointer to the resulting
-   partly-built GrismMap. */
-   new = astLoadMapping( mem, size, (AstMappingVtab *) vtab, name,
-                         channel );
-
-   if ( astOK ) {
-
-/* Read input data. */
-/* ================ */
-/* Request the input Channel to read all the input data appropriate to
-   this class into the internal "values list". */
-      astReadClassData( channel, "GrismMap" );
-
-/* Now read each individual data item from this list and use it to
-   initialise the appropriate instance variable(s) for this class. */
-
-      new->nr = astReadDouble( channel, "grmnr", AST__BAD );
-      if ( TestGrismNR( new, status ) ) SetGrismNR( new, new->nr, status );
-
-      new->nrp = astReadDouble( channel, "grmnrp", AST__BAD );
-      if ( TestGrismNRP( new, status ) ) SetGrismNRP( new, new->nrp, status );
-
-      new->waver = astReadDouble( channel, "grmwr", AST__BAD );
-      if ( TestGrismWaveR( new, status ) ) SetGrismWaveR( new, new->waver, status );
-
-      new->alpha = astReadDouble( channel, "grmalp", AST__BAD );
-      if ( TestGrismAlpha( new, status ) ) SetGrismAlpha( new, new->alpha, status );
-
-      new->g = astReadDouble( channel, "grmg", AST__BAD );
-      if ( TestGrismG( new, status ) ) SetGrismG( new, new->g, status );
-
-      new->m = astReadInt( channel, "grmm", INT_MAX );
-      if ( TestGrismM( new, status ) ) SetGrismM( new, new->m, status );
-
-      new->eps = astReadDouble( channel, "grmeps", AST__BAD );
-      if ( TestGrismEps( new, status ) ) SetGrismEps( new, new->eps, status );
-
-      new->theta = astReadDouble( channel, "grmth", AST__BAD );
-      if ( TestGrismTheta( new, status ) ) SetGrismTheta( new, new->theta, status );
-
-/* Set up the other required derived constants. */
-      UpdateConstants( new, status );
-   }
-
-/* If an error occurred, clean up by deleting the new GrismMap. */
-   if ( !astOK ) new = astDelete( new );
-
-/* Return the new GrismMap pointer. */
-   return new;
-
-/* Undefine macros local to this function. */
-#undef KEY_LEN
-}
-
-/* Virtual function interfaces. */
-/* ============================ */
-/* These provide the external interface to the virtual functions
-   defined by this class. Each simply checks the global error status
-   and then locates and executes the appropriate member function,
-   using the function pointer stored in the object's virtual function
-   table (this pointer is located using the astMEMBER macro defined in
-   "object.h").
-
-   Note that the member function may not be the one defined here, as
-   it may have been over-ridden by a derived class. However, it should
-   still have the same interface. */
-
-
-
-
-