update ast

1 files changed, 0 insertions, 2074 deletions

diff --git a/ast/zoommap.c b/ast/zoommap.c
deleted file mode 100644
index 44177d1..0000000
--- a/ast/zoommap.c
+++ /dev/null
@@ -1,2074 +0,0 @@
-/*
-*class++
-*  Name:
-*     ZoomMap
-
-*  Purpose:
-*     Zoom coordinates about the origin.
-
-*  Constructor Function:
-c     astZoomMap
-f     AST_ZOOMMAP
-
-*  Description:
-*     The ZoomMap class implements a Mapping which performs a "zoom"
-*     transformation by multiplying all coordinate values by the same
-*     scale factor (the inverse transformation is performed by
-*     dividing by this scale factor). The number of coordinate values
-*     representing each point is unchanged.
-
-*  Inheritance:
-*     The ZoomMap class inherits from the Mapping class.
-
-*  Attributes:
-*     In addition to those attributes common to all Mappings, every
-*     ZoomMap also has the following attributes:
-*
-*     - Zoom: ZoomMap scale factor
-
-*  Functions:
-c     The ZoomMap class does not define any new functions beyond those
-f     The ZoomMap 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:
-*     RFWS: R.F. Warren-Smith (Starlink)
-*     DSB: David S. Berry (Starlink)
-
-*  History:
-*     1-FEB-1996 (RFWS):
-*        Original version.
-*     18-JUL-1996 (RFWS):
-*        Updated to support attributes and an external interface.
-*     10-SEP-1996 (RFWS):
-*        Added I/O facilities.
-*     4-JUN-1997 (RFWS):
-*        Over-ride the MapMerge method to provide ZoomMap
-*        simplification facilities.
-*     8-JAN-2003 (DSB):
-*        Changed private InitVtab method to protected astInitZoomMapVtab
-*        method.
-*     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 ZoomMap
-
-/* Include files. */
-/* ============== */
-/* Interface definitions. */
-/* ---------------------- */
-
-#include "globals.h"             /* Thread-safe global data access */
-#include "error.h"               /* Error reporting facilities */
-#include "memory.h"              /* Memory allocation 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 "channel.h"             /* I/O channels */
-#include "unitmap.h"             /* Unit Mappings */
-#include "matrixmap.h"           /* Matrix Mappings */
-#include "zoommap.h"             /* Interface definition for this class */
-
-/* Error code definitions. */
-/* ----------------------- */
-#include "ast_err.h"             /* AST error codes */
-
-/* C header files. */
-/* --------------- */
-#include <float.h>
-#include <math.h>
-#include <stdarg.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <string.h>
-
-/* 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(ZoomMap)
-
-/* Define macros for accessing each item of thread specific global data. */
-#define class_init astGLOBAL(ZoomMap,Class_Init)
-#define class_vtab astGLOBAL(ZoomMap,Class_Vtab)
-#define getattrib_buff astGLOBAL(ZoomMap,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 AstZoomMapVtab 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. */
-AstZoomMap *astZoomMapId_( int, double, const char *, ... );
-
-/* Prototypes for Private Member Functions. */
-/* ======================================== */
-static AstPointSet *Transform( AstMapping *, AstPointSet *, int, AstPointSet *, int * );
-static const char *GetAttrib( AstObject *, const char *, int * );static double GetZoom( AstZoomMap *, int * );
-static double Rate( AstMapping *, double *, int, int, int * );
-static int *MapSplit( AstMapping *, int, const int *, AstMapping **, int * );
-static int Equal( AstObject *, AstObject *, int * );
-static int GetIsLinear( AstMapping *, int * );
-static int MapMerge( AstMapping *, int, int, int *, AstMapping ***, int **, int * );
-static int TestAttrib( AstObject *, const char *, int * );
-static int TestZoom( AstZoomMap *, int * );
-static void ClearAttrib( AstObject *, const char *, int * );
-static void ClearZoom( AstZoomMap *, int * );
-static void Dump( AstObject *, AstChannel *, int * );
-static void SetAttrib( AstObject *, const char *, int * );
-static void SetZoom( AstZoomMap *, double, int * );
-
-/* Member functions. */
-/* ================= */
-static void ClearAttrib( AstObject *this_object, const char *attrib, int *status ) {
-/*
-*  Name:
-*     ClearAttrib
-
-*  Purpose:
-*     Clear an attribute value for a ZoomMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     void ClearAttrib( AstObject *this, const char *attrib, int *status )
-
-*  Class Membership:
-*     ZoomMap 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
-*     ZoomMap, so that the default value will subsequently be used.
-
-*  Parameters:
-*     this
-*        Pointer to the ZoomMap.
-*     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: */
-   AstZoomMap *this;             /* Pointer to the ZoomMap structure */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Obtain a pointer to the ZoomMap structure. */
-   this = (AstZoomMap *) this_object;
-
-/* Check the attribute name and clear the appropriate attribute. */
-
-/* Zoom. */
-/* ----- */
-   if ( !strcmp( attrib, "zoom" ) ) {
-      astClearZoom( 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 ZoomMaps are equivalent.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     int Equal( AstObject *this, AstObject *that, int *status )
-
-*  Class Membership:
-*     ZoomMap 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 ZoomMaps are equivalent.
-
-*  Parameters:
-*     this
-*        Pointer to the first Object (a ZoomMap).
-*     that
-*        Pointer to the second Object.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     One if the ZoomMaps 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: */
-   AstZoomMap *that;
-   AstZoomMap *this;
-   int nin;
-   int nout;
-   int result;
-
-/* Initialise. */
-   result = 0;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Obtain pointers to the two ZoomMap structures. */
-   this = (AstZoomMap *) this_object;
-   that = (AstZoomMap *) that_object;
-
-/* Check the second object is a ZoomMap. We know the first is a
-   ZoomMap since we have arrived at this implementation of the virtual
-   function. */
-   if( astIsAZoomMap( 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 ZoomMaps differ, it may still be possible
-   for them to be equivalent. First compare the ZoomMaps if their Invert
-   flags are the same. In this case all the attributes of the two ZoomMaps
-   must be identical. */
-         if( astGetInvert( this ) == astGetInvert( that ) ) {
-            result = ( astEQUAL( this->zoom, that->zoom ) );
-
-/* If the Invert flags for the two ZoomMaps differ, the attributes of the two
-   ZoomMaps must be inversely related to each other. */
-         } else {
-            result = ( astEQUAL( this->zoom, 1.0/that->zoom ) );
-
-         }
-      }
-   }
-
-/* 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 ZoomMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     const char *GetAttrib( AstObject *this, const char *attrib, int *status )
-
-*  Class Membership:
-*     ZoomMap 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 ZoomMap, formatted as a character string.
-
-*  Parameters:
-*     this
-*        Pointer to the ZoomMap.
-*     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 ZoomMap, 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 ZoomMap. 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 */
-   AstZoomMap *this;             /* Pointer to the ZoomMap structure */
-   const char *result;           /* Pointer value to return */
-   double zoom;                  /* Zoom 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 ZoomMap structure. */
-   this = (AstZoomMap *) 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. */
-
-/* Zoom. */
-/* ----- */
-   if ( !strcmp( attrib, "zoom" ) ) {
-      zoom = astGetZoom( this );
-      if ( astOK ) {
-         (void) sprintf( getattrib_buff, "%.*g", DBL_DIG, zoom );
-         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;
-}
-
-static int GetIsLinear( AstMapping *this_mapping, int *status ){
-/*
-*  Name:
-*     GetIsLinear
-
-*  Purpose:
-*     Return the value of the IsLinear attribute for a ZoomMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "mapping.h"
-*     void GetIsLinear( AstMapping *this, int *status )
-
-*  Class Membership:
-*     ZoomMap member function (over-rides the protected astGetIsLinear
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function returns the value of the IsLinear attribute for a
-*     Frame, which is always one.
-
-*  Parameters:
-*     this
-*        Pointer to the ZoomMap.
-*     status
-*        Pointer to the inherited status variable.
-*/
-   return 1;
-}
-
-void astInitZoomMapVtab_(  AstZoomMapVtab *vtab, const char *name, int *status ) {
-/*
-*+
-*  Name:
-*     astInitZoomMapVtab
-
-*  Purpose:
-*     Initialise a virtual function table for a ZoomMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     void astInitZoomMapVtab( AstZoomMapVtab *vtab, const char *name )
-
-*  Class Membership:
-*     ZoomMap vtab initialiser.
-
-*  Description:
-*     This function initialises the component of a virtual function
-*     table which is used by the ZoomMap 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 astIsAZoomMap) 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->ClearZoom = ClearZoom;
-   vtab->GetZoom = GetZoom;
-   vtab->SetZoom = SetZoom;
-   vtab->TestZoom = TestZoom;
-
-/* 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;
-   mapping->MapSplit = MapSplit;
-   mapping->Rate = Rate;
-   mapping->GetIsLinear = GetIsLinear;
-
-/* Declare the class dump function. There is no copy constructor or
-   destructor. */
-   astSetDump( vtab, Dump, "ZoomMap", "Zoom about the origin" );
-
-/* 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 ZoomMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "mapping.h"
-*     int MapMerge( AstMapping *this, int where, int series, int *nmap,
-*                   AstMapping ***map_list, int **invert_list, int *status )
-
-*  Class Membership:
-*     ZoomMap 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 ZoomMap 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 ZoomMap with one 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 ZoomMap which is to be merged with
-*        its neighbours. This should be a cloned copy of the ZoomMap
-*        pointer contained in the array element "(*map_list)[where]"
-*        (see below). This pointer will not be annulled, and the
-*        ZoomMap it identifies will not be modified by this function.
-*     where
-*        Index in the "*map_list" array (below) at which the pointer
-*        to the nominated ZoomMap 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 *map;              /* Pointer to Mapping */
-   AstMapping *new;              /* Pointer to replacement Mapping */
-   const char *class;            /* Pointer to Mapping class string */
-   double *zooms;                /* Pointer to zoom factor array */
-   double maxzoom;               /* Maximum zoom factor */
-   double minzoom;               /* Minimum zoom factor */
-   double zoom;                  /* Zoom factor */
-   int coord;                    /* Loop counter for coordinates */
-   int imap1;                    /* Index of first ZoomMap */
-   int imap2;                    /* Index of last ZoomMap */
-   int imap;                     /* Loop counter for Mappings */
-   int ncoord;                   /* Number of input/output coordinates */
-   int ngone;                    /* Number of Mappings eliminated */
-   int nin;                      /* Total number of input coordinates */
-   int nzoom;                    /* Number of zoom factors */
-   int result;                   /* Result value to return */
-   int simpler;                  /* Mapping(s) simplified? */
-   int single;                   /* Replacement is a single ZoomMap? */
-   int unit;                     /* Replacement Mapping is a UnitMap? */
-
-/* Initialise the returned result. */
-   result = -1;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Further initialisation. */
-   new = NULL;
-   ngone = 0;
-   simpler = 0;
-
-/* In series. */
-/* ---------- */
-/* Handle the case where the Mappings are connected in series. */
-   if ( series ) {
-
-/* Obtain the effective zoom factor of the nominated Mapping (which is
-   a ZoomMap) when its Invert attribute is set to the value given. */
-      zoom = astGetZoom( ( *map_list )[ where ] );
-      if ( ( *invert_list )[ where ] ) zoom = 1.0 / zoom;
-
-/* Search adjacent lower-numbered Mappings and identify the class to
-   which they belong. */
-      imap1 = where;
-      while ( astOK && ( ( imap1 - 1 ) >= 0 ) ) {
-         map = ( *map_list )[ imap1 - 1 ];
-         class = astGetClass( map );
-         if ( astOK ) {
-
-/* For each ZoomMap found, obtain the effective zoom factor (taking
-   account of the associated invert flag value), and accumulate the
-   overall zoom factor to be used for the simplified Mapping. */
-            if ( !strcmp( class, "ZoomMap" ) ) {
-               if ( ( *invert_list )[ imap1 - 1 ] ) {
-                  zoom /= astGetZoom( map );
-               } else {
-                  zoom *= astGetZoom( map );
-               }
-
-/* UnitMaps have an effective zoom factor of unity, so we include them
-   but they so have no effect. Quit looping when the first Mapping is
-   found which is not a ZoomMap or a UnitMap. */
-            } else if ( strcmp( class, "UnitMap" ) ) {
-               break;
-            }
-            imap1--;
-         }
-      }
-
-/* Similarly search adjacent higher-numbered ZoomMaps and UnitMaps and
-   accumulate their effective zoom factors. */
-      imap2 = where;
-      while ( astOK && ( ( imap2 + 1 ) < *nmap ) ) {
-         map = ( *map_list )[ imap2 + 1 ];
-         class = astGetClass( map );
-         if ( astOK ) {
-            if ( !strcmp( class, "ZoomMap" ) ) {
-               if ( ( *invert_list )[ imap2 + 1 ] ) {
-                  zoom /= astGetZoom( map );
-               } else {
-                  zoom *= astGetZoom( map );
-               }
-            } else if ( strcmp( class, "UnitMap" ) ) {
-               break;
-            }
-            imap2++;
-         }
-      }
-
-/* Determine how many Mappings can be eliminated by condensing those
-   found above into a single Mapping. */
-      ngone = imap2 - imap1;
-
-/* Determine if the replacement Mapping can be a UnitMap. This will be
-   the case only if the accumulated zoom factor is unity (within some
-   tolerable error). */
-      unit = ( fabs( zoom - 1.0 ) <= ( 8.0 * DBL_EPSILON ) );
-
-/* Determine if simplification is possible. This will be so if (a)
-   Mappings can be eliminated ("ngone" is non-zero), or (b) the
-   replacement can be a UnitMap, or (c) where there was initially only
-   one ZoomMap, its invert flag was set (it will always be cleared in
-   the replacement Mapping). */
-      simpler = ngone || unit || ( *invert_list )[ where ];
-
-/* Do nothing more unless simplification is possible. */
-      if ( simpler ) {
-
-/* Obtain the number of input/output coordinates for the replacement
-   Mapping and create the appropriate replacement. */
-         nin = astGetNin( ( *map_list )[ where ] );
-         if ( unit ) {
-            new = (AstMapping *) astUnitMap( nin, "", status );
-         } else {
-            new = (AstMapping *) astZoomMap( nin, zoom, "", status );
-         }
-      }
-
-/* In parallel. */
-/* ------------ */
-/* Handle the case where the Mappings are connected in parallel. */
-   } else {
-
-/* Obtain the number of input/output coordinates for the nominated Mapping. */
-      nin = astGetNin( ( *map_list )[ where ] );
-
-/* Search adjacent lower-numbered Mappings and identify the class to
-   which they belong. */
-      imap1 = where;
-      while ( astOK && ( ( imap1 - 1 ) >= 0 ) ) {
-         map = ( *map_list )[ imap1 - 1 ];
-         class = astGetClass( map );
-         if ( astOK ) {
-
-/* Quit looping when the first Mapping is found which is not a ZoomMap
-   or a UnitMap. */
-            if ( strcmp( class, "ZoomMap" ) &&
-                 strcmp( class, "UnitMap" ) ) break;
-
-/* Accumulate the total number of input/output coordinates for each
-   adjacent ZoomMap and UnitMap found. */
-            nin += astGetNin( map );
-            imap1--;
-         }
-      }
-
-/* Similarly search adjacent higher-numbered Mappings and accumulate
-   the number of input/output coordinates.*/
-      imap2 = where;
-      while ( astOK && ( ( imap2 + 1 ) < *nmap ) ) {
-         map = ( *map_list )[ imap2 + 1 ];
-         class = astGetClass( map );
-         if ( astOK ) {
-            if ( strcmp( class, "ZoomMap" ) &&
-                 strcmp( class, "UnitMap" ) ) break;
-            nin += astGetNin( map );
-            imap2++;
-         }
-      }
-
-/* Allocate memory for an array of zoom factors, one for each
-   input/output coordinate in the replacement Mapping. */
-      zooms = astMalloc( sizeof( double ) * (size_t) nin );
-      if ( astOK ) {
-
-/* Initialise. */
-         nzoom = 0;
-         minzoom = DBL_MAX;
-         maxzoom = -DBL_MAX;
-
-/* Loop through all the ZoomMaps and UnitMaps being merged and again
-   identify the class to which they belong. */
-         for ( imap = imap1; astOK && ( imap <= imap2 ); imap++ ) {
-            map = ( *map_list )[ imap ];
-            class = astGetClass( map );
-            if ( astOK ) {
-
-/* Set a default zoom factor of unity (for UnitMaps). If the Mapping
-   is a ZoomMap, replace this with the effective zoom factor, taking
-   account of the associated invert flag. */
-               zoom = 1.0;
-               if ( !strcmp( class, "ZoomMap" ) ) {
-                  if ( ( *invert_list )[ imap ] ) {
-                     zoom = 1.0 / astGetZoom( map );
-                  } else {
-                     zoom = astGetZoom( map );
-                  }
-               }
-
-/* Replicate the zoom factor in the zoom factor array, once for each
-   input/output coordinate associated with the current Mapping. */
-               ncoord = astGetNin( map );
-               for ( coord = 0; coord < ncoord; coord++ ) {
-                  zooms[ nzoom++ ] = zoom;
-               }
-
-/* Store the minimum and maximum zoom factors encountered. */
-               if ( zoom < minzoom ) minzoom = zoom;
-               if ( zoom > maxzoom ) maxzoom = zoom;
-            }
-         }
-
-/* Determine how many Mappings can be eliminated by condensing those
-   found above into a single Mapping. */
-         ngone = imap2 - imap1;
-
-/* Determine whether the replacement Mapping can be a single
-   ZoomMap. This will be so if all the effective zoom factors were the
-   same. */
-         single = ( minzoom == maxzoom );
-
-/* Determine if the replacement Mapping can be a UnitMap. This will be
-   so if all the effective zoom factors were equal to unity. */
-         unit = single && ( minzoom == 1.0 );
-
-/* Determine if simplification is possible. This will be so if (a)
-   Mappings can be eliminated ("ngone" is non-zero), or (b) the
-   replacement can be a UnitMap, or (c) where there was initially only
-   one ZoomMap, its invert flag was set (it will always be cleared in
-   the replacement Mapping). */
-         simpler = ngone || unit || ( *invert_list )[ where ];
-
-/* Do nothing more unless simplification is possible. */
-         if ( simpler ) {
-
-/* Create a replacement UnitMap or ZoomMap if appropriate. */
-            if ( unit ) {
-               new = (AstMapping *) astUnitMap( nin, "", status );
-            } else if ( single ) {
-               new = (AstMapping *) astZoomMap( nin, minzoom, "", status );
-
-/* Otherwise, replace the original ZoomMaps and UnitMaps with a
-   diagonal MatrixMap containing the zoom factors as its diagonal
-   elements. */
-            } else {
-               new = (AstMapping *) astMatrixMap( nin, nin, 1, zooms, "", status );
-            }
-         }
-      }
-
-/* Free the array of zoom factors. */
-      zooms = astFree( zooms );
-   }
-
-/* If OK, and simplification is possible, we now have a replacement
-   Mapping and can insert it into the Mapping list. */
-   if ( astOK ) {
-      if ( simpler ) {
-
-/* Annul the pointers to all the ZoomMaps that are being replaced. */
-         for ( imap = imap1; imap <= imap2; imap++ ) {
-            ( *map_list )[ imap ] = astAnnul( ( *map_list )[ imap ] );
-         }
-
-/* Insert the new pointer and the associated invert flag. */
-         ( *map_list )[ imap1 ] = new;
-         ( *invert_list )[ imap1 ] = 0;
-
-/* Loop to close the resulting gap by moving subsequent elements down
-   in the arrays. */
-         for ( imap = imap2 + 1; imap < *nmap; imap++ ) {
-            ( *map_list )[ imap - ngone ] = ( *map_list )[ imap ];
-            ( *invert_list )[ imap - ngone ] = ( *invert_list )[ imap ];
-         }
-
-/* Clear the vacated elements at the end. */
-         for ( imap = *nmap - ngone; imap < *nmap; imap++ ) {
-            ( *map_list )[ imap ] = NULL;
-            ( *invert_list )[ imap ] = 0;
-         }
-
-/* Decrement the Mapping count and return the index of the first
-   modified element. */
-         ( *nmap ) -= ngone;
-         result = imap1;
-      }
-
-/* If an error occurred, but a new Mapping has been created, then
-   annul it. */
-   } else {
-      if ( new ) new = astAnnul( new );
-   }
-
-/* If an error occurred, clear the returned result. */
-   if ( !astOK ) result = -1;
-
-/* Return the result. */
-   return result;
-}
-
-static int *MapSplit( AstMapping *this_map, int nin, const int *in, AstMapping **map, int *status ){
-/*
-*  Name:
-*     MapSplit
-
-*  Purpose:
-*     Create a Mapping representing a subset of the inputs of an existing
-*     ZoomMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     int *MapSplit( AstMapping *this, int nin, const int *in, AstMapping **map, int *status )
-
-*  Class Membership:
-*     ZoomMap method (over-rides the protected astMapSplit method
-*     inherited from the Mapping class).
-
-*  Description:
-*     This function creates a new Mapping by picking specified inputs from
-*     an existing ZoomMap. This is only possible if the specified inputs
-*     correspond to some subset of the ZoomMap outputs. That is, there
-*     must exist a subset of the ZoomMap outputs for which each output
-*     depends only on the selected ZoomMap inputs, and not on any of the
-*     inputs which have not been selected. If this condition is not met
-*     by the supplied ZoomMap, then a NULL Mapping is returned.
-
-*  Parameters:
-*     this
-*        Pointer to the ZoomMap to be split (the ZoomMap is not actually
-*        modified by this function).
-*     nin
-*        The number of inputs to pick from "this".
-*     in
-*        Pointer to an array of indices (zero based) for the inputs which
-*        are to be picked. This array should have "nin" elements. If "Nin"
-*        is the number of inputs of the supplied ZoomMap, then each element
-*        should have a value in the range zero to Nin-1.
-*     map
-*        Address of a location at which to return a pointer to the new
-*        Mapping. This Mapping will have "nin" inputs (the number of
-*        outputs may be different to "nin"). A NULL pointer will be
-*        returned if the supplied ZoomMap has no subset of outputs which
-*        depend only on the selected inputs.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     A pointer to a dynamically allocated array of ints. The number of
-*     elements in this array will equal the number of outputs for the
-*     returned Mapping. Each element will hold the index of the
-*     corresponding output in the supplied ZoomMap. The array should be
-*     freed using astFree when no longer needed. A NULL pointer will
-*     be returned if no output Mapping can be created.
-
-*  Notes:
-*     - If this function is invoked with the global error status set,
-*     or if it should fail for any reason, then NULL values will be
-*     returned as the function value and for the "map" pointer.
-*/
-
-/* Local Variables: */
-   AstZoomMap *this;          /* Pointer to ZoomMap structure */
-   int *result;               /* Pointer to returned array */
-   int i;                     /* Loop count */
-   int iin;                   /* Mapping input index */
-   int mnin;                  /* No. of Mapping inputs */
-   int ok;                    /* Are input indices OK? */
-
-/* Initialise */
-   result = NULL;
-   *map = NULL;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Get a pointer to the ZoomMap structure. */
-   this = (AstZoomMap *) this_map;
-
-/* Allocate memory for the returned array and create a ZoomMap with the
-   required number of axes. */
-   result = astMalloc( sizeof( int )*(size_t) nin );
-   *map = (AstMapping *) astZoomMap( nin, astGetZoom( this ), "", status );
-
-/* Set its Invert attribute to be like the supplied ZoomMap. */
-   astSetInvert( *map, astGetInvert( this ) );
-
-/* Check pointers can be used safely. */
-   if( astOK ) {
-
-/* Store the required output axis indices. At the same time check that each
-   axis is valid. */
-      mnin = astGetNin( this );
-      ok = 1;
-      for( i = 0; i < nin; i++ ) {
-         iin = in[ i ];
-         if( iin >= 0 && iin < mnin ) {
-            result[ i ] = iin;
-         } else {
-            ok = 0;
-            break;
-         }
-      }
-
-/* If the "in" array contained any invalid values, free the returned
-   resources. */
-      if( !ok ) {
-         result = astFree( result );
-         *map = astAnnul( *map );
-      }
-   }
-
-/* Free returned resources if an error has occurred. */
-   if( !astOK ) {
-      result = astFree( result );
-      *map = astAnnul( *map );
-   }
-
-/* Return the list of output indices. */
-   return result;
-}
-
-static double Rate( AstMapping *this, double *at, int ax1, int ax2, int *status ){
-/*
-*  Name:
-*     Rate
-
-*  Purpose:
-*     Calculate the rate of change of a Mapping output.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     result = Rate( AstMapping *this, double *at, int ax1, int ax2, int *status )
-
-*  Class Membership:
-*     ZoomMap member function (overrides the astRate method inherited
-*     from the Mapping class ).
-
-*  Description:
-*     This function returns the rate of change of a specified output of
-*     the supplied Mapping with respect to a specified input, at a
-*     specified input position.
-
-*  Parameters:
-*     this
-*        Pointer to the Mapping to be applied.
-*     at
-*        The address of an array holding the axis values at the position
-*        at which the rate of change is to be evaluated. The number of
-*        elements in this array should equal the number of inputs to the
-*        Mapping.
-*     ax1
-*        The index of the Mapping output for which the rate of change is to
-*        be found (output numbering starts at 0 for the first output).
-*     ax2
-*        The index of the Mapping input which is to be varied in order to
-*        find the rate of change (input numbering starts at 0 for the first
-*        input).
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     The rate of change of Mapping output "ax1" with respect to input
-*     "ax2", evaluated at "at", or AST__BAD if the value cannot be
-*     calculated.
-
-*/
-
-/* Local Variables: */
-   double result;
-
-/* Check inherited status */
-   if( !astOK ) return AST__BAD;
-
-/* Result is zero if the axes differ */
-   if( ax1 != ax2 ) {
-      result = 0.0;
-
-/* Otherwise, get the zoom factor. */
-   } else {
-      result = astGetZoom( (AstZoomMap *) this );
-
-/* If the ZoomMap has been inverted, return the reciprocal of the zoom
-   factor. */
-      if ( astGetInvert( this ) ) {
-         if( result != AST__BAD && result != 0.0 ) {
-            result = 1.0/result;
-         } else {
-            result = AST__BAD;
-         }
-      }
-   }
-
-/* 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 ZoomMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     void SetAttrib( AstObject *this, const char *setting )
-
-*  Class Membership:
-*     ZoomMap member function (over-rides the astSetAttrib protected
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function assigns an attribute value for a ZoomMap, 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 ZoomMap.
-*     setting
-*        Pointer to a null-terminated string specifying the new attribute
-*        value.
-*/
-
-/* Local Variables: */
-   AstZoomMap *this;             /* Pointer to the ZoomMap structure */
-   double zoom;                  /* Zoom 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 ZoomMap structure. */
-   this = (AstZoomMap *) 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. */
-
-/* Zoom. */
-/* ----- */
-   if ( nc = 0,
-        ( 1 == astSscanf( setting, "zoom= %lf %n", &zoom, &nc ) )
-        && ( nc >= len ) ) {
-      astSetZoom( this, zoom );
-
-/* 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 ZoomMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     int TestAttrib( AstObject *this, const char *attrib, int *status )
-
-*  Class Membership:
-*     ZoomMap 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 ZoomMap's attributes.
-
-*  Parameters:
-*     this
-*        Pointer to the ZoomMap.
-*     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: */
-   AstZoomMap *this;             /* Pointer to the ZoomMap structure */
-   int result;                   /* Result value to return */
-
-/* Initialise. */
-   result = 0;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Obtain a pointer to the ZoomMap structure. */
-   this = (AstZoomMap *) this_object;
-
-/* Check the attribute name and test the appropriate attribute. */
-
-/* Zoom. */
-/* ----- */
-   if ( !strcmp( attrib, "zoom" ) ) {
-      result = astTestZoom( 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 ZoomMap to transform a set of points.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     AstPointSet *Transform( AstMapping *this, AstPointSet *in,
-*                             int forward, AstPointSet *out, int *status )
-
-*  Class Membership:
-*     ZoomMap member function (over-rides the astTransform protected
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function takes a ZoomMap and a set of points encapsulated in a
-*     PointSet and transforms the points so as to apply the required zoom
-*     factor.
-
-*  Parameters:
-*     this
-*        Pointer to the ZoomMap.
-*     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
-*     match the number of coordinates for the ZoomMap being applied.
-*     -  If an output PointSet is supplied, it must have space for sufficient
-*     number of points and coordinate values per point to accommodate the
-*     result. Any excess space will be ignored.
-*/
-
-/* Local Variables: */
-   AstPointSet *result;          /* Pointer to output PointSet */
-   AstZoomMap *map;              /* Pointer to ZoomMap to be applied */
-   double **ptr_in;              /* Pointer to input coordinate data */
-   double **ptr_out;             /* Pointer to output coordinate data */
-   double scale;                 /* Scale factor to implement zoom */
-   int coord;                    /* Loop counter for coordinates */
-   int ncoord_in;                /* Number of coordinates per input point */
-   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 ZoomMap. */
-   map = (AstZoomMap *) 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 and coordinates per point from the input
-   PointSet and obtain pointers for accessing the input and output coordinate
-   values. */
-   ncoord_in = astGetNcoord( in );
-   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;
-
-/* Perform coordinate arithmetic. */
-/* ------------------------------ */
-/* Generate the coordinate scale factor, according to the direction
-   of mapping required. */
-   scale = astGetZoom( map );
-   if ( !forward && astOK ) scale = 1.0 / scale;
-
-/* Loop to apply the scale factor to all the coordinate values, checking for
-   (and propagating) bad values in the process. */
-   if ( astOK ) {
-      for ( coord = 0; coord < ncoord_in; coord++ ) {
-         for ( point = 0; point < npoint; point++ ) {
-            if ( ptr_in[ coord ][ point ] == AST__BAD ) {
-               ptr_out[ coord ][ point ] = AST__BAD;
-            } else {
-               ptr_out[ coord ][ point ] = ptr_in[ coord ][ point ] * scale;
-            }
-         }
-      }
-   }
-
-/* Return a pointer to the output PointSet. */
-   return result;
-}
-
-/* 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:
-*     Zoom
-
-*  Purpose:
-*     ZoomMap scale factor.
-
-*  Type:
-*     Public attribute.
-
-*  Synopsis:
-*     Double precision.
-
-*  Description:
-*     This attribute holds the ZoomMap scale factor, by which
-*     coordinate values are multiplied (by the forward transformation)
-*     or divided (by the inverse transformation). The default value
-*     is unity.
-*
-c     Note that if a ZoomMap is inverted (e.g. by using astInvert),
-f     Note that if a ZoomMap is inverted (e.g. by using AST_INVERT),
-*     then the reciprocal of this zoom factor will, in effect, be
-*     used.
-*
-*     In general, Mapping attributes cannot be changed after the Mapping
-*     has been created (the exception to this is the Invert attribute,
-*     which can be changed at any time). However, several of the oldest
-*     Mapping classes - including the ZoomMap class - were introduced
-*     into the AST library before this restriction was enforced. To
-*     reduce the chances of breaking existing software, the attributes of
-*     such Mappings may still be changed, but only for Mapping instances
-*     that have exactly one active reference. In other words, an error will
-*     be reported if an attempt is made to set or clear an attribute of a
-*     Mapping (other than the Invert attribute) if that Mapping has been
-*     cloned. Mappings are cloned when they are incorporated into another
-*     object such as a CmpMap or FrameSet, or when the
-c     astClone
-f     AST_CLONE
-*     function is used.
-
-*  Applicability:
-*     ZoomMap
-*        All ZoomMaps have this attribute.
-
-*  Notes:
-*     - The Zoom attribute may not be set to zero.
-*att--
-*/
-/* This ia a double value with a value of 0.0 when undefined but
-   yielding a default of 1.0. Setting it explicitly to 0.0 is not
-   permitted except via astClearZoom. */
-astMAKE_CLEAR1(ZoomMap,Zoom,zoom,0.0)
-astMAKE_GET(ZoomMap,Zoom,double,1.0,( ( this->zoom == 0.0 ) ?
-                                      1.0 : this->zoom ))
-
-/* Check for an attempt to set a value of zero and report an error if
-   necessary (leaving the Zoom value unchanged). */
-astMAKE_SET1(ZoomMap,Zoom,double,zoom,(
-            ( value != 0.0 ) ?
-            value :
-            ( astError( AST__ZOOMI,
-                       "astSetZoom(%s): A zoom factor of zero is not allowed.", status,
-                        astGetClass( this ) ),
-              this->zoom ) ))
-astMAKE_TEST(ZoomMap,Zoom,( this->zoom != 0.0 ))
-
-/* 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 ZoomMap 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 ZoomMap class to an output Channel.
-
-*  Parameters:
-*     this
-*        Pointer to the ZoomMap 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: */
-   AstZoomMap *this;             /* Pointer to the ZoomMap structure */
-   double dval;                  /* Double value */
-   int set;                      /* Attribute value set? */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Obtain a pointer to the ZoomMap structure. */
-   this = (AstZoomMap *) this_object;
-
-/* Write out values representing the instance variables for the
-   ZoomMap 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. */
-
-/* Zoom. */
-/* ----- */
-   set = TestZoom( this, status );
-   dval = set ? GetZoom( this, status ) : astGetZoom( this );
-   astWriteDouble( channel, "Zoom", set, 1, dval, "Zoom factor" );
-}
-
-/* Standard class functions. */
-/* ========================= */
-/* Implement the astIsAZoomMap and astCheckZoomMap functions using the macros
-   defined for this purpose in the "object.h" header file. */
-astMAKE_ISA(ZoomMap,Mapping)
-astMAKE_CHECK(ZoomMap)
-
-AstZoomMap *astZoomMap_( int ncoord, double zoom, const char *options, int *status, ...) {
-/*
-*++
-*  Name:
-c     astZoomMap
-f     AST_ZOOMMAP
-
-*  Purpose:
-*     Create a ZoomMap.
-
-*  Type:
-*     Public function.
-
-*  Synopsis:
-c     #include "zoommap.h"
-c     AstZoomMap *astZoomMap( int ncoord, double zoom,
-c                             const char *options, ... )
-f     RESULT = AST_ZOOMMAP( NCOORD, ZOOM, OPTIONS, STATUS )
-
-*  Class Membership:
-*     ZoomMap constructor.
-
-*  Description:
-*     This function creates a new ZoomMap and optionally initialises its
-*     attributes.
-*
-*     A ZoomMap is a Mapping which "zooms" a set of points about the
-*     origin by multiplying all coordinate values by the same scale
-*     factor (the inverse transformation is performed by dividing by
-*     this scale factor).
-
-*  Parameters:
-c     ncoord
-f     NCOORD = INTEGER (Given)
-*        The number of coordinate values for each point to be
-*        transformed (i.e. the number of dimensions of the space in
-*        which the points will reside). The same number is applicable
-*        to both input and output points.
-c     zoom
-f     ZOOM = DOUBLE PRECISION (Given)
-*        Initial scale factor by which coordinate values should be
-*        multiplied (by the forward transformation) or divided (by the
-*        inverse transformation). This factor may subsequently be
-*        changed via the ZoomMap's Zoom attribute. It may be positive
-*        or negative, but should not be zero.
-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 ZoomMap. 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 ZoomMap. 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     astZoomMap()
-f     AST_ZOOMMAP = INTEGER
-*        A pointer to the new ZoomMap.
-
-*  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.
-
-*  Status Handling:
-*     The protected interface to this function includes an extra
-*     parameter at the end of the parameter list descirbed above. This
-*     parameter is a pointer to the integer inherited status
-*     variable: "int *status".
-
-*--
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstZoomMap *new;              /* Pointer to new ZoomMap */
-   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 ZoomMap, allocating memory and initialising the
-   virtual function table as well if necessary. */
-   new = astInitZoomMap( NULL, sizeof( AstZoomMap ), !class_init, &class_vtab,
-                         "ZoomMap", ncoord, zoom );
-
-/* 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 ZoomMap'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 ZoomMap. */
-   return new;
-}
-
-AstZoomMap *astZoomMapId_( int ncoord, double zoom,
-                           const char *options, ... ) {
-/*
-*  Name:
-*     astZoomMapId_
-
-*  Purpose:
-*     Create a ZoomMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     AstZoomMap *astZoomMapId_( int ncoord, double zoom,
-*                                const char *options, ... )
-
-*  Class Membership:
-*     ZoomMap constructor.
-
-*  Description:
-*     This function implements the external (public) interface to the
-*     astZoomMap constructor function. It returns an ID value (instead
-*     of a true C pointer) to external users, and must be provided
-*     because astZoomMap_ 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 astZoomMap_ 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 astZoomMap_.
-
-*  Returned Value:
-*     The ID value associated with the new ZoomMap.
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstZoomMap *new;              /* Pointer to new ZoomMap */
-   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 ZoomMap, allocating memory and initialising the
-   virtual function table as well if necessary. */
-   new = astInitZoomMap( NULL, sizeof( AstZoomMap ), !class_init, &class_vtab,
-                         "ZoomMap", ncoord, zoom );
-
-/* 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 ZoomMap'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 ZoomMap. */
-   return astMakeId( new );
-}
-
-AstZoomMap *astInitZoomMap_( void *mem, size_t size, int init,
-                             AstZoomMapVtab *vtab, const char *name,
-                             int ncoord, double zoom, int *status ) {
-/*
-*+
-*  Name:
-*     astInitZoomMap
-
-*  Purpose:
-*     Initialise a ZoomMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     AstZoomMap *astInitZoomMap( void *mem, size_t size, int init,
-*                                 AstZoomMapVtab *vtab, const char *name,
-*                                 int ncoord, double zoom )
-
-*  Class Membership:
-*     ZoomMap initialiser.
-
-*  Description:
-*     This function is provided for use by class implementations to initialise
-*     a new ZoomMap object. It allocates memory (if necessary) to accommodate
-*     the ZoomMap plus any additional data associated with the derived class.
-*     It then initialises a ZoomMap 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 ZoomMap at the start of the memory passed via the
-*     "vtab" parameter.
-
-*  Parameters:
-*     mem
-*        A pointer to the memory in which the ZoomMap is to be initialised.
-*        This must be of sufficient size to accommodate the ZoomMap data
-*        (sizeof(ZoomMap)) 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 ZoomMap (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 ZoomMap
-*        structure, so a valid value must be supplied even if not required for
-*        allocating memory.
-*     init
-*        A logical flag indicating if the ZoomMap'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 ZoomMap.
-*     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).
-*     ncoord
-*        The number of coordinate values per point.
-*     zoom
-*        The scale factor by which coordinate values are multiplied (by the
-*        forward mapping) or divided (by the inverse mapping). This factor may
-*        not be zero.
-
-*  Returned Value:
-*     A pointer to the new ZoomMap.
-
-*  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: */
-   AstZoomMap *new;              /* Pointer to new ZoomMap */
-
-/* Check the global status. */
-   if ( !astOK ) return NULL;
-
-/* If necessary, initialise the virtual function table. */
-   if ( init ) astInitZoomMapVtab( vtab, name );
-
-/* Initialise. */
-   new = NULL;
-
-/* Check the initialisation value(s) for validity, reporting an error if
-   necessary. Prefix the error report with the name of the function and the
-   class of object being processed. */
-   if ( zoom == 0.0 ) {
-      astError( AST__ZOOMI, "astInitZoomMap(%s): A zoom factor of zero is not "
-                "allowed.", status, name );
-   } else {
-
-/* Initialise a Mapping structure (the parent class) as the first component
-   within the ZoomMap structure, allocating memory if necessary. Specify that
-   the Mapping should be defined in both the forward and inverse directions. */
-      new = (AstZoomMap *) astInitMapping( mem, size, 0,
-                                           (AstMappingVtab *) vtab, name,
-                                           ncoord, ncoord, 1, 1 );
-
-      if ( astOK ) {
-
-/* Initialise the ZoomMap data. */
-/* ---------------------------- */
-/* Store the zoom factor. */
-         new->zoom = zoom;
-
-/* If an error occurred, clean up by deleting the new ZoomMap. */
-         if ( !astOK ) new = astDelete( new );
-      }
-   }
-
-/* Return a pointer to the new ZoomMap. */
-   return new;
-}
-
-AstZoomMap *astLoadZoomMap_( void *mem, size_t size,
-                             AstZoomMapVtab *vtab, const char *name,
-                             AstChannel *channel, int *status ) {
-/*
-*+
-*  Name:
-*     astLoadZoomMap
-
-*  Purpose:
-*     Load a ZoomMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "zoommap.h"
-*     AstZoomMap *astLoadZoomMap( void *mem, size_t size,
-*                                 AstZoomMapVtab *vtab, const char *name,
-*                                 AstChannel *channel )
-
-*  Class Membership:
-*     ZoomMap loader.
-
-*  Description:
-*     This function is provided to load a new ZoomMap 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
-*     ZoomMap 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 ZoomMap at the start of the memory
-*     passed via the "vtab" parameter.
-
-
-*  Parameters:
-*     mem
-*        A pointer to the memory into which the ZoomMap is to be
-*        loaded.  This must be of sufficient size to accommodate the
-*        ZoomMap data (sizeof(ZoomMap)) 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 ZoomMap (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 ZoomMap 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(AstZoomMap) is used instead.
-*     vtab
-*        Pointer to the start of the virtual function table to be
-*        associated with the new ZoomMap. If this is NULL, a pointer
-*        to the (static) virtual function table for the ZoomMap 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 "ZoomMap" is used instead.
-
-*  Returned Value:
-*     A pointer to the new ZoomMap.
-
-*  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: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstZoomMap *new;              /* Pointer to the new ZoomMap */
-
-/* Initialise. */
-   new = NULL;
-
-/* Check the global error status. */
-   if ( !astOK ) return new;
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(channel);
-
-/* If a NULL virtual function table has been supplied, then this is
-   the first loader to be invoked for this ZoomMap. In this case the
-   ZoomMap belongs to this class, so supply appropriate values to be
-   passed to the parent class loader (and its parent, etc.). */
-   if ( !vtab ) {
-      size = sizeof( AstZoomMap );
-      vtab = &class_vtab;
-      name = "ZoomMap";
-
-/* If required, initialise the virtual function table for this class. */
-      if ( !class_init ) {
-         astInitZoomMapVtab( 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 ZoomMap. */
-   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, "ZoomMap" );
-
-/* Now read each individual data item from this list and use it to
-   initialise the appropriate instance variable(s) for this class. */
-
-/* In the case of attributes, we first read the "raw" input value,
-   supplying the "unset" value as the default. If a "set" value is
-   obtained, we then use the appropriate (private) Set... member
-   function to validate and set the value properly. */
-
-/* Zoom. */
-/* ----- */
-      new->zoom = astReadDouble( channel, "zoom", 0.0 );
-      if ( TestZoom( new, status ) ) SetZoom( new, new->zoom, status );
-
-/* If an error occurred, clean up by deleting the new ZoomMap. */
-      if ( !astOK ) new = astDelete( new );
-   }
-
-/* Return the new ZoomMap pointer. */
-   return new;
-}
-
-/* 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. */
-
-
-
-
-