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-/*
-*class++
-* Name:
-* UnitNormMap
-
-* Purpose:
-* Convert a vector to a unit vector and its norm, relative to a specified centre.
-
-* Constructor Function:
-c astUnitNormMap
-f AST_UNITNORMMAP
-
-* Description:
-* The forward transformation of a UnitNormMap subtracts the specified centre
-* and then transforms the resulting vector to a unit vector and the vector norm.
-* The output contains one more coordinate than the input: the initial Nin outputs
-* are in the same order as the input; the final output is the norm.
-*
-* The inverse transformation of a UnitNormMap multiplies each component
-* of the provided vector by the provided norm and adds the specified centre.
-* The output contains one fewer coordinate than the input: the initial Nin inputs
-* are in the same order as the output; the final input is the norm.
-*
-* UnitNormMap enables radially symmetric transformations, as follows:
-* - apply a UnitNormMap to produce a unit vector and norm (radius)
-* - apply a one-dimensional mapping to the norm (radius), while passing the unit vector unchanged
-* - apply the same UnitNormMap in the inverse direction to produce the result
-
-* Inheritance:
-* The UnitNormMap class inherits from the Mapping class.
-
-* Attributes:
-* The UnitNormMap class does not define any new attributes beyond those
-* which are applicable to all Mappings.
-
-* Functions:
-c The UnitNormMap class does not define any new functions beyond those
-f The UnitNormMap class does not define any new routines beyond those
-* which are applicable to all Mappings.
-
-* Copyright:
-* Copyright (C) 2016 University of Washington
-
-* 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:
-* RO: Russell Owen (LSST)
-
-* History:
-* 20-APR-2016 (RO):
-* Original version.
-*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 UnitNormMap
-
-/* 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))
-
-/* Macro to check for equality of floating point values. We cannot
- compare bad values directory because of the danger of floating point
- exceptions, so bad values are dealt with explicitly. */
-#define EQUAL(aa,bb) (((aa)==AST__BAD)?(((bb)==AST__BAD)?1:0):(((bb)==AST__BAD)?0:(fabs((aa)-(bb))<=1.0E9*MAX((fabs(aa)+fabs(bb))*DBL_EPSILON,DBL_MIN))))
-
-/* 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 "object.h" /* Base Object class */
-#include "pointset.h" /* Sets of points/coordinates */
-#include "unitmap.h" /* Unit mappings */
-#include "mapping.h" /* Coordinate mappings (parent class) */
-#include "shiftmap.h" /* ShiftMap */
-#include "winmap.h" /* ShiftMap */
-#include "channel.h" /* I/O channels */
-#include "unitnormmap.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 int (* parent_getobjsize)( AstObject *, int * );
-static AstPointSet *(* parent_transform)( AstMapping *, AstPointSet *, int, AstPointSet *, int * );
-
-
-#ifdef THREAD_SAFE
-/* Define how to initialise thread-specific globals. */
-#define GLOBAL_inits \
- globals->Class_Init = 0;
-
-/* Create the function that initialises global data for this module. */
-astMAKE_INITGLOBALS(UnitNormMap)
-
-/* Define macros for accessing each item of thread specific global data. */
-#define class_init astGLOBAL(UnitNormMap,Class_Init)
-#define class_vtab astGLOBAL(UnitNormMap,Class_Vtab)
-
-
-#include <pthread.h>
-
-
-#else
-
-
-/* Define the class virtual function table and its initialisation flag
- as static variables. */
-static AstUnitNormMapVtab 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. */
-AstUnitNormMap *astUnitNormMapId_( int, const double [], const char *, ... );
-
-/* Prototypes for Private Member Functions. */
-/* ======================================== */
-
-static AstPointSet *Transform( AstMapping *, AstPointSet *, int, AstPointSet *, int * );
-static int GetMappingType( AstMapping *, int * );
-static AstMapping * MakeMergedMap( AstMapping *, AstMapping *, int * );
-static int GetObjSize( AstObject *, int * );
-static int MapMerge( AstMapping *, int, int, int *, AstMapping ***, int **, int * );
-static void Copy( const AstObject *, AstObject *, int * );
-static void Delete( AstObject *, int * );
-static void Dump( AstObject *, AstChannel *, int * );
-static int GetIsLinear( AstMapping *, int * );
-
-/* Member functions. */
-/* ================= */
-static int GetMappingType( AstMapping *map, int *status ) {
-/*
-*
-* Name:
-* GetMappingType
-
-* Purpose:
-* Return a code describing the mapping type, to aid simplification.
-
-* Type:
-* Private function.
-
-* Synopsis:
-* #include "unitnormmap.h"
-* int MakeMergedMap( AstMapping *map1, AstMapping *map2, int inv1, int inv2, int *status )
-
-* Class Membership:
-* UnitNormMap internal utility function.
-
-* Description:
-* This function returns an integer code describing the type of a mapping,
-* to help with merging two mappings. The codes are:
-* 3 = WinMap
-* 2 = ShiftMap
-* 1 = UnitNormMap
-* 0 = other
-
-* Parameters:
-* map
-* A pointer to the mapping
-* status
-* Pointer to the inherited status variable.
-
-* Returned Value:
-* A pointer to the merged mapping, or NULL if the Mappings cannot be merged
-
-*/
- const char *class = astGetClass( map );
- int type = 0;
- if( strcmp( class, "UnitNormMap" ) == 0 ) {
- type = 1;
- } else if( strcmp( class, "ShiftMap" ) == 0 ) {
- type = 2;
- } else if( strcmp( class, "WinMap" ) == 0){
- type = 3;
- }
- return type;
-}
-
-static AstMapping * MakeMergedMap( AstMapping *map1, AstMapping *map2, int *status ){
-/*
-*
-* Name:
-* MakeMergedMap
-
-* Purpose:
-* Make a single Mapping that is equivalent to the merging of two other Mappings,
-* one of which must be a UnitNormMap.
-
-* Type:
-* Private function.
-
-* Synopsis:
-* #include "unitnormmap.h"
-* int MakeMergedMap( AstMapping *map1, AstMapping *map2, int inv1, int inv2, int *status )
-
-* Class Membership:
-* UnitNormMap internal utility function.
-
-* Description:
-* This function returns a single Mapping that is the equivalent of the two supplied Mappings,
-* if they can be merged. One of the pair must be a UnitNormMap.
-*
-* Supported merges, which must be in series:
-* ShiftMap + UnitNormMap(forward) = UnitNormMap(forward)
-* WinMap with unit scale + UnitNormMap(forward) = UnitNormMap(forward)
-* UnitNormMap(inverted) + ShiftMap = UnitNormMap(inverted)
-* UnitNormMap(inverted) + WinMap with unit scale = UnitNormMap(inverted)
-* UnitNormMap(forward) + identical UnitNormMap(inverted) = UnitMap
-* UnitNormMap(inverted) + identical UnitNormMap(forward) = UnitMap
-* UnitNormMap(forward) + UnitNormMap(inverted) = ShiftMap
-*
-*
-* Notes:
-* - A UnitMap before or after a UnitNormMap = the UnitNormMap, but UnitMap takes care of that merge.
-* - The code that checks for ShiftMap + UnitNormMap probably never runs, because ShiftMap is
-* converted to WinMap during simplification before it gets here.
-
-* Parameters:
-* map1
-* A pointer to the first mapping.
-* map2
-* A pointer to the second mapping.
-* status
-* Pointer to the inherited status variable.
-
-* Returned Value:
-* A pointer to the merged mapping, or NULL if the Mappings cannot be merged
-
-*/
-
-/* Check the global error status. */
- if( !astOK ) return NULL;
-
-/* Initialise returned mapping */
- AstMapping *retmap = NULL;
-
-/* Set type to 1=UnitNormMap, 2=ShiftMap, 0=other for both maps */
- int type1 = GetMappingType( map1, status );
- int type2 = GetMappingType( map2, status );
- if( !astOK ) return NULL;
-
- if( type1 == 0 || type2 == 0 ) return NULL; /* can only merge with UnitNormMap or ShiftMap */
-
- if( !(type1 == 1 || type2 == 1) ) return NULL; /* one must be a UnitNormMap */
-
- if( type1 == 2 ) {
- if( astGetInvert( map2 )) return NULL; /* ShiftMap + UnitNormMap(inverted) not supported */
-
-/* ShiftMap + UnitNormMap(forward) = UnitNormMap(forward) */
- AstShiftMap *shiftmap = (AstShiftMap *) map1;
- AstUnitNormMap *unm = (AstUnitNormMap *) map2;
- int nin = astGetNin( shiftmap );
- double shiftmult = astGetInvert( shiftmap ) ? -1 : 1;
- double *newcentre = astMalloc( sizeof(double)*(size_t)nin );
- int coord = 0;
- for( coord = 0; coord < nin; coord++ ){
- newcentre[coord] = unm->centre[coord] - shiftmult*shiftmap->shift[coord];
- }
- retmap = (AstMapping *) astUnitNormMap( nin, newcentre, "", status );
- if( retmap == NULL ){
- astFree( (void *) newcentre );
- }
- } else if( type1 == 3 ) {
- if( astGetInvert( map2 )) return NULL; /* WinMap + UnitNormMap(inverted) not supported */
-
-/* WinMap with unit scale + UnitNormMap(forward) = UnitNormMap(forward);
- abort if WinMap does not have unit scale */
- AstWinMap *winmap = (AstWinMap *) map1;
- AstUnitNormMap *unm = (AstUnitNormMap *) map2;
- int nin = astGetNin( winmap );
- double shiftmult = astGetInvert( winmap ) ? -1 : 1;
- double *newcentre = astMalloc( sizeof(double)*(size_t)nin );
- int coord = 0;
- for( coord = 0; coord < nin; coord++ ){
- if( !EQUAL( winmap->b[coord], 1.0 )) return NULL;
- newcentre[coord] = unm->centre[coord] - shiftmult*winmap->a[coord];
- }
- retmap = (AstMapping *) astUnitNormMap( nin, newcentre, "", status );
- if( retmap == NULL ){
- astFree( (void *) newcentre );
- }
- } else if( type2 == 2 ) {
- if( !astGetInvert( map1 )) return NULL; /* UnitNormMap(forward) + ShiftMap not supported */
-
-/* UnitNormMap(inverted) + ShiftMap = UnitNormMap(inverted) */
- AstShiftMap *shiftmap = (AstShiftMap *) map2;
- AstUnitNormMap *unm = (AstUnitNormMap *) map1;
- int nin = astGetNin( shiftmap );
- double shiftmult = astGetInvert( shiftmap ) ? -1 : 1;
- double *newcentre = astMalloc( sizeof(double)*(size_t)nin );
- int coord = 0;
- for( coord = 0; coord < nin; coord++ ){
- newcentre[coord] = unm->centre[coord] + shiftmult*shiftmap->shift[coord];
- }
- retmap = (AstMapping *) astUnitNormMap( nin, newcentre, "Invert=1", status );
- if( retmap == NULL ){
- astFree( (void *) newcentre );
- }
- } else if( type2 == 3 ) {
- if( !astGetInvert( map1 )) return NULL; /* UnitNormMap(forward) + WinMap not supported */
-
-/* UnitNormMap(inverted) + WinMap = UnitNormMap(inverted);
- abort if WinMap does not have unit scale */
- AstWinMap *winmap = (AstWinMap *) map2;
- AstUnitNormMap *unm = (AstUnitNormMap *) map1;
- int nin = astGetNin( winmap );
- double shiftmult = astGetInvert( winmap ) ? -1 : 1;
- double *newcentre = astMalloc( sizeof(double)*(size_t)nin );
- int coord = 0;
- for( coord = 0; coord < nin; coord++ ){
- if( !EQUAL( winmap->b[coord], 1.0 )) return NULL;
- newcentre[coord] = unm->centre[coord] + shiftmult*winmap->a[coord];
- }
- retmap = (AstMapping *) astUnitNormMap( nin, newcentre, "Invert=1", status );
- if( retmap == NULL ){
- astFree( (void *) newcentre );
- }
- } else {
- if( !astGetInvert( map1 ) == !astGetInvert( map2 )) return NULL; /* UNMs must have opposite dir. */
-
-/* Two UnitNormMaps in opposite directions */
- AstUnitNormMap *unm1 = (AstUnitNormMap *) map1;
- AstUnitNormMap *unm2 = (AstUnitNormMap *) map2;
-
- int ctrlen = MIN( astGetNin( map1 ), astGetNin( map2 ) );
- int centres_equal = 1;
- int i = 0;
- for( i = 0; i < ctrlen; i++ ){
- if( !EQUAL( unm1->centre[i], unm2->centre[i] )){
- centres_equal = 0;
- break;
- }
- }
- if( centres_equal ) {
-
-/* Two UnitNormMap in opposite directions with identical centres = UnitMap */
- retmap = (AstMapping *) astUnitMap( astGetNin( map1 ), "", status );
- } else {
- if( astGetInvert( map2 )) {
-
-/* UnitNormMap(forward) + UnitNormMap(inverted) = ShiftMap */
- int nin = astGetNin( map1 );
- double *shift = astMalloc( sizeof(double)*(size_t)nin );
- int coord = 0;
- for( coord = 0; coord < nin; coord++ ){
- shift[coord] = unm2->centre[coord] - unm1->centre[coord];
- }
- retmap = (AstMapping *) astShiftMap( nin, shift, "", status );
- if( retmap == NULL ){
- astFree( (void *) shift );
- }
- }
- }
- }
-
- return astOK ? retmap : NULL;
-}
-
-static int GetIsLinear( AstMapping *this_mapping, int *status ){
-/*
-* Name:
-* GetIsLinear
-
-* Purpose:
-* Return the value of the IsLinear attribute for a UnitNormMap.
-
-* Type:
-* Private function.
-
-* Synopsis:
-* #include "mapping.h"
-* void GetIsLinear( AstMapping *this, int *status )
-
-* Class Membership:
-* UnitNormMap 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 UnitNormMap.
-* status
-* Pointer to the inherited status variable.
-*/
- return 0;
-}
-
-static int GetObjSize( AstObject *this_object, int *status ) {
-/*
-* Name:
-* GetObjSize
-
-* Purpose:
-* Return the in-memory size of an Object.
-
-* Type:
-* Private function.
-
-* Synopsis:
-* #include "unitnormmap.h"
-* int GetObjSize( AstObject *this, int *status )
-
-* Class Membership:
-* UnitNormMap member function (over-rides the astGetObjSize protected
-* method inherited from the parent class).
-
-* Description:
-* This function returns the in-memory size of the supplied UnitNormMap,
-* in bytes.
-
-* Parameters:
-* this
-* Pointer to the UnitNormMap.
-* status
-* Pointer to the inherited status variable.
-
-* Returned Value:
-* The Object size, in bytes.
-
-* 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.
-*/
-
-/* Initialise. */
- int result = 0;
-
-/* Check the global error status. */
- if( !astOK ) return result;
-
-/* Obtain a pointers to the UnitNormMap structure. */
- AstUnitNormMap *this = (AstUnitNormMap *) this_object;
-
-/* Invoke the GetObjSize method inherited from the parent class, and then
- add on any components of the class structure defined by thsi class
- which are stored in dynamically allocated memory. */
- result = (*parent_getobjsize)( this_object, status );
- result += astTSizeOf( this->centre );
-
-/* If an error occurred, clear the result value. */
- if( !astOK ) result = 0;
-
-/* Return the result, */
- return result;
-}
-
-void astInitUnitNormMapVtab_( AstUnitNormMapVtab *vtab, const char *name, int *status ) {
-/*
-*+
-* Name:
-* astInitUnitNormMapVtab
-
-* Purpose:
-* Initialise a virtual function table for a UnitNormMap.
-
-* Type:
-* Protected function.
-
-* Synopsis:
-* #include "unitnormmap.h"
-* void astInitUnitNormMapVtab( AstUnitNormMapVtab *vtab, const char *name )
-
-* Class Membership:
-* UnitNormMap vtab initialiser.
-
-* Description:
-* This function initialises the component of a virtual function
-* table which is used by the UnitNormMap 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).
-*-
-*/
-
-/* Check the local error status. */
- if( !astOK ) return;
-
-/* Get a pointer to the thread specific global data structure. */
- astDECLARE_GLOBALS /* Pointer to thread-specific global data */
- 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 astIsAUnitNormMap) 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. */
-
-/* Save the inherited pointers to methods that will be extended, and
- replace them with pointers to the new member functions. */
- AstObjectVtab *object = (AstObjectVtab *) vtab;
- AstMappingVtab *mapping = (AstMappingVtab *) vtab;
- parent_getobjsize = object->GetObjSize;
- object->GetObjSize = GetObjSize;
-
- parent_transform = mapping->Transform;
- mapping->Transform = Transform;
-
-/* Store replacement pointers for methods which will be over-ridden by
- new member functions implemented here. */
- mapping->MapMerge = MapMerge;
- mapping->GetIsLinear = GetIsLinear;
-
-/* Declare the class dump, copy and delete functions.*/
- astSetDump( vtab, Dump, "UnitNormMap", "Compute unit vector and norm relative to a centre" );
- astSetCopy( (AstObjectVtab *) vtab, Copy );
- astSetDelete( (AstObjectVtab *) vtab, Delete );
-
-/* 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 UnitNormMap.
-
-* 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:
-* UnitNormMap 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 UnitNormMap 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 UnitNormMap 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 UnitNormMap which is to be merged with
-* its neighbours. This should be a cloned copy of the UnitNormMap
-* pointer contained in the array element "(*map_list)[where]"
-* (see below). This pointer will not be annulled, and the
-* UnitNormMap it identifies will not be modified by this function.
-* where
-* Index in the "*map_list" array (below) at which the pointer
-* to the nominated UnitNormMap 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.
-*/
-
-/* Initialise. */
- int result = -1;
-
-/* Check the global error status. */
- if( !astOK ) return result;
-
- if( series ) {
-
-/* In series */
-/* Try to merge UnitNormMap with either of its neighbours. */
- AstMapping *map1 = NULL; /* The first Mapping to merge */
- AstMapping *map2 = NULL; /* The second Mapping to merge */
- AstMapping *newmap = NULL; /* The merged Mapping */
- int i1 = MAX( where - 1, 0 );
- int i2 = i1 + 1;
- for( ; i2 < *nmap; i1++, i2++ ){
- map1 = ( *map_list )[ i1 ];
- map2 = ( *map_list )[ i2 ];
- int wasinverted1 = astGetInvert( map1 );
- int wasinverted2 = astGetInvert( map2 );
- astSetInvert( map1, ( *invert_list )[ i1 ] );
- astSetInvert( map2, ( *invert_list )[ i2 ] );
- newmap = MakeMergedMap( map1, map2, status );
- astSetInvert( map1, wasinverted1 );
- astSetInvert( map2, wasinverted2 );
- if( newmap ) break;
- }
-
- if( !newmap ) return -1;
- if( !astOK ) {
- astAnnul( newmap );
- return -1;
- }
-
-/* Annul the first of the two Mappings, and replace it with the merged Mapping.
- Also update the invert flag. */
- (void) astAnnul( map1 );
- ( *map_list )[ i1 ] = newmap;
- ( *invert_list )[ i1 ] = astGetInvert( newmap );
-
-/* Annul the second of the two Mappings, and shuffle down the rest of the list to fill the gap. */
- (void) astAnnul( map2 );
- int i = 0;
- 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;
-
- } else {
-
-/* In parallel. */
-/* UnitNormMaps cannot combine in parallel with any other Mappings. */
- }
-
-/* Return the result. */
- return result;
-}
-
-static AstPointSet *Transform( AstMapping *this, AstPointSet *in,
- int forward, AstPointSet *out, int *status ) {
-/*
-* Name:
-* Transform
-
-* Purpose:
-* Apply a UnitNormMap to transform a set of points.
-
-* Type:
-* Private function.
-
-* Synopsis:
-* #include "unitnormmap.h"
-* AstPointSet *Transform( AstMapping *this, AstPointSet *in,
-* int forward, AstPointSet *out, int *status )
-
-* Class Membership:
-* UnitNormMap member function (over-rides the astTransform protected
-* method inherited from the Mapping class).
-
-* Description:
-* This function takes a UnitNormMap and a set of points encapsulated in a
-* PointSet and transforms the points so as to map them into the
-* required window.
-
-* Parameters:
-* this
-* Pointer to the UnitNormMap.
-* 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 UnitNormMap 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.
-*/
-
-/* Check the global error status. */
- if( !astOK ) return NULL;
-
-/* Obtain a pointer to the UnitNormMap. */
- AstUnitNormMap *map = (AstUnitNormMap *) 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. */
- AstPointSet *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. */
- int ncoord_in = astGetNcoord( in );
- int ncoord_out = astGetNcoord( result );
- int npoint = astGetNpoint(in);
- double **ptr_in = astGetPoints(in);
- double **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;
- }
-
-/* Report an error if the UnitNormMap does not contain a centre. */
- if( !map->centre && astOK ){
- const char *class = astGetClass( this );
- astError( AST__BADSM, "astTransform(%s): The supplied %s does not "
- "contain any centre information.", status, class, class );
- }
-
-/* Perform coordinate arithmetic. */
-/* ------------------------------ */
- if( astOK ){
-
-/* If any centre coordinate is bad then set all outputs bad */
- int const ncoord_centre = forward ? ncoord_in : ncoord_out;
- int coord_ctr = 0;
- for( coord_ctr = 0; coord_ctr < ncoord_centre; coord_ctr++ ){
- if( (map->centre)[coord_ctr] == AST__BAD ){
- int coord_out = 0;
- for( coord_out = 0; coord_out < ncoord_out; coord_out++ ){
- int point = 0;
- for( point = 0; point < npoint; point++ ){
- ptr_out[point][coord_out] = AST__BAD;
- }
- }
- return result;
- }
- }
-
- if( forward ){
-
-/* Forward transformation: vector to unit vector, norm */
- int point = 0;
- for( point = 0; point < npoint; point++ ){
-
-/* Compute max_relin: the maximum absolute input value relative to centre */
- double max_relin = 0;
- int coord_in = 0;
- for( coord_in = 0; coord_in < ncoord_in; coord_in++ ){
- double in = ptr_in[coord_in][point];
- if( in == AST__BAD ){
-
-/* An input coord is bad, so all output coords are bad */
- int coord_out = 0;
- for( coord_out = 0; coord_out < ncoord_out; coord_out++ ){
- ptr_out[coord_out][point] = AST__BAD;
- }
- goto forward_next_point;
- }
- double abs_relin = fabs(in - map->centre[coord_in]);
- if( abs_relin > max_relin ){
- max_relin = abs_relin;
- }
- }
-
- if( max_relin == 0 ){
-
-/* All inputs are 0, so all outputs are bad */
- int coord = 0;
- for( coord = 0; coord < ncoord_out; coord++ ){
- ptr_out[coord][point] = AST__BAD;
- }
- continue;
- }
-
-/* All is well; compute scaled_sum as the sum of (relin/max_relin)^2 for each input
- where relin = in - centre (the scaling avoids overflow),
- then compute norm = max_relin * sqrt(scaled_sum) and set all outputs */
- double scaled_sum = 0;
- int coord = 0;
- for( coord = 0; coord < ncoord_in; coord++ ){
- double scaled_in = (ptr_in[coord][point] - map->centre[coord])/max_relin;
- scaled_sum += scaled_in*scaled_in;
- }
- double norm = max_relin*sqrt(scaled_sum);
- for( coord = 0; coord < ncoord_in; coord++ ){
- ptr_out[coord][point] = (ptr_in[coord][point] - map->centre[coord])/norm;
- }
- ptr_out[ncoord_out - 1][point] = norm;
-
- forward_next_point: ;
- }
- } else {
-
-/* Inverse transformation: unit vector, norm -> vector */
- int point = 0;
- for( point = 0; point < npoint; point++ ){
- double norm = ptr_in[ncoord_in-1][point];
- if( norm == AST__BAD ){
-
-/* Norm is bad for this point; set all output coords bad */
- int coord = 0;
- for( coord = 0; coord < ncoord_out; coord++ ){
- ptr_out[coord][point] = AST__BAD;
- }
- } else {
- int coord = 0;
- for( coord = 0; coord < ncoord_out; coord++ ){
- double in = ptr_in[coord][point];
- if( in == AST__BAD ){
- ptr_out[coord][point] = AST__BAD;
- } else {
- ptr_out[coord][point] = in*norm + map->centre[coord];
- }
- }
- }
- }
- }
- }
-
-/* 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). */
-
-/* Copy constructor. */
-/* ----------------- */
-static void Copy( const AstObject *objin, AstObject *objout, int *status ) {
-/*
-* Name:
-* Copy
-
-* Purpose:
-* Copy constructor for UnitNormMap objects.
-
-* Type:
-* Private function.
-
-* Synopsis:
-* void Copy( const AstObject *objin, AstObject *objout, int *status )
-
-* Description:
-* This function implements the copy constructor for UnitNormMap objects.
-
-* Parameters:
-* objin
-* Pointer to the UnitNormMap to be copied.
-* objout
-* Pointer to the UnitNormMap being constructed.
-* status
-* Pointer to the inherited status variable.
-
-*/
-
-/* Local Variables: */
- AstUnitNormMap *out; /* Pointer to output UnitNormMap */
- AstUnitNormMap *in; /* Pointer to input UnitNormMap */
- int ncoord; /* No. of axes for the mapping */
-
-/* Check the global error status. */
- if( !astOK ) return;
-
-/* Obtain a pointer to the input and output UnitNormMaps. */
- in= (AstUnitNormMap *) objin;
- out = (AstUnitNormMap *) objout;
-
-/* Get the number of coordinates mapped by the UnitNormMap. */
- ncoord = astGetNin( in );
-
-/* Allocate memory holding copies of the centre defining the mapping. */
- out->centre = (double *) astStore( NULL, (void *) in->centre,
- sizeof(double)*(size_t)ncoord );
-
-/* If an error occurred, free any allocated memory. */
- if( !astOK ) {
- out->centre = (double *) astFree( (void *) out->centre );
- }
-
-}
-
-/* Destructor. */
-/* ----------- */
-static void Delete( AstObject *obj, int *status ) {
-/*
-* Name:
-* Delete
-
-* Purpose:
-* Destructor for UnitNormMap objects.
-
-* Type:
-* Private function.
-
-* Synopsis:
-* void Delete( AstObject *obj, int *status )
-
-* Description:
-* This function implements the destructor for UnitNormMap objects.
-
-* Parameters:
-* obj
-* Pointer to the UnitNormMap to be deleted.
-* status
-* Pointer to the inherited status variable.
-
-* Notes:
-* - This destructor does nothing and exists only to maintain a
-* one-to-one correspondence between destructors and copy
-* constructors.
-*/
-
-/* Local Variables: */
- AstUnitNormMap *this; /* Pointer to UnitNormMap */
-
-/* Obtain a pointer to the UnitNormMap structure. */
- this = (AstUnitNormMap *) obj;
-
-/* Free the memory holding the centre. */
- this->centre = (double *) astFree( (void *) this->centre );
-
-}
-
-/* Dump function. */
-/* -------------- */
-static void Dump( AstObject *this_object, AstChannel *channel, int *status ) {
-/*
-* Name:
-* Dump
-
-* Purpose:
-* Dump function for UnitNormMap 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 UnitNormMap class to an output Channel.
-
-* Parameters:
-* this
-* Pointer to the UnitNormMap 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 Constants: */
-#define COMMENT_LEN 50 /* Maximum length of a comment string */
-#define KEY_LEN 50 /* Maximum length of a keyword */
-
-/* Local Variables: */
- char buff[ KEY_LEN + 1 ]; /* Buffer for keyword string */
- char comment[ COMMENT_LEN + 1 ]; /* Buffer for comment string */
-
-/* Check the global error status. */
- if( !astOK ) return;
-
-/* Obtain a pointer to the UnitNormMap structure. */
- AstUnitNormMap *this = (AstUnitNormMap *) this_object;
-
-/* Get the number of coordinates to be mapped. */
- int ncoord = astGetNin( this );
-
-/* Write out values representing the instance variables for the
- UnitNormMap class. Accompany these with appropriate comment strings,
- possibly depending on the values being written.*/
-
-/* The centre. */
- int axis = 0;
- for( axis = 0; axis < ncoord; axis++ ){
- (void) sprintf( buff, "Ctr%d", axis + 1 );
- (void) sprintf( comment, "Centre for axis %d", axis + 1 );
- astWriteDouble( channel, buff, (this->centre)[ axis ] != 0.0, 0,
- (this->centre)[ axis ], comment );
- }
-
-/* Undefine macros local to this function. */
-#undef COMMENT_LEN
-#undef KEY_LEN
-}
-
-/* Standard class functions. */
-/* ========================= */
-/* Implement the astIsAUnitNormMap and astCheckUnitNormMap functions using the macros
- defined for this purpose in the "object.h" header file. */
-astMAKE_ISA(UnitNormMap,Mapping)
-astMAKE_CHECK(UnitNormMap)
-
-AstUnitNormMap *astUnitNormMap_( int ncoord, const double centre[], const char *options, int *status, ...) {
-/*
-*++
-* Name:
-c astUnitNormMap
-f AST_UNITNORMMAP
-
-* Purpose:
-* Create a UnitNormMap.
-
-* Type:
-* Public function.
-
-* Synopsis:
-c #include "unitnormmap.h"
-c AstUnitNormMap *astUnitNormMap( int ncoord, const double centre[],
-c const char *options, ... )
-f RESULT = AST_UNITNORMMAP( NCOORD, CENTRE, OPTIONS, STATUS )
-
-* Class Membership:
-* UnitNormMap constructor.
-
-* Description:
-* This function creates a new UnitNormMap and optionally initialises its
-* attributes.
-*
-* The forward transformation of a UnitNormMap subtracts the specified centre
-* and then transforms the resulting vector to a unit vector and the vector norm.
-* The output contains one more coordinate than the input: the initial Nin outputs
-* are in the same order as the input; the final output is the norm.
-*
-* The inverse transformation of a UnitNormMap multiplies each component
-* of the provided vector by the provided norm and adds the specified centre.
-* The output contains one fewer coordinate than the input: the initial Nin inputs
-* are in the same order as the output; the final input is the norm.
-*
-* UnitNormMap enables radially symmetric transformations, as follows:
-* - apply a UnitNormMap to produce a unit vector and norm (radius)
-* - apply a one-dimensional mapping to the norm (radius), while passing the unit vector unchanged
-* - apply the same UnitNormMap in the inverse direction to produce the result
-
-* 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). Output will include one additional coordinate.
-c centre
-f CENTRE( NCOORD ) = DOUBLE PRECISION (Given)
-* An array containing the values to be subtracted from the input
-* coordinates before computing unit vector and norm. A separate
-* value must be supplied for each coordinate.
-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 UnitNormMap. 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 UnitNormMap. 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 astUnitNormMap()
-f AST_UNITNORMMAP = INTEGER
-* A pointer to the new UnitNormMap.
-
-* 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".
-
-*--
-*/
-
-/* Get a pointer to the thread specific global data structure. */
- astDECLARE_GLOBALS /* Pointer to thread-specific global data */
- astGET_GLOBALS(NULL);
-
-/* Check the global status. */
- if( !astOK ) return NULL;
-
-/* Initialise the UnitNormMap, allocating memory and initialising the
- virtual function table as well if necessary. */
- AstUnitNormMap *new = astInitUnitNormMap( NULL, sizeof( AstUnitNormMap ), !class_init, &class_vtab,
- "UnitNormMap", ncoord, centre );
-
-/* 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 UnitNormMap's attributes. */
- va_list args;
- 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 UnitNormMap. */
- return new;
-}
-
-AstUnitNormMap *astUnitNormMapId_( int ncoord, const double centre[],
- const char *options, ... ) {
-/*
-* Name:
-* astUnitNormMapId_
-
-* Purpose:
-* Create a UnitNormMap.
-
-* Type:
-* Private function.
-
-* Synopsis:
-* #include "unitnormmap.h"
-* AstUnitNormMap *astUnitNormMapId_( int ncoord, const double centre[],
-* const char *options, ... )
-
-* Class Membership:
-* UnitNormMap constructor.
-
-* Description:
-* This function implements the external (public) interface to the
-* astUnitNormMap constructor function. It returns an ID value (instead
-* of a true C pointer) to external users, and must be provided
-* because astUnitNormMap_ 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 astUnitNormMap_ 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 astUnitNormMap_.
-
-* Returned Value:
-* The ID value associated with the new UnitNormMap.
-*/
-
- 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. */
- astDECLARE_GLOBALS /* Pointer to thread-specific global data */
- astGET_GLOBALS(NULL);
-
-/* Check the global status. */
- if( !astOK ) return NULL;
-
-/* Initialise the UnitNormMap, allocating memory and initialising the
- virtual function table as well if necessary. */
- AstUnitNormMap *new = astInitUnitNormMap( NULL, sizeof( AstUnitNormMap ), !class_init, &class_vtab,
- "UnitNormMap", ncoord, centre );
-
-/* 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 UnitNormMap's attributes. */
- va_list args; /* Variable argument list */
- 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 UnitNormMap. */
- return astMakeId( new );
-}
-
-AstUnitNormMap *astInitUnitNormMap_( void *mem, size_t size, int init,
- AstUnitNormMapVtab *vtab, const char *name,
- int ncoord, const double *centre, int *status ) {
-/*
-*+
-* Name:
-* astInitUnitNormMap
-
-* Purpose:
-* Initialise a UnitNormMap.
-
-* Type:
-* Protected function.
-
-* Synopsis:
-* #include "unitnormmap.h"
-* AstUnitNormMap *astInitUnitNormMap( void *mem, size_t size, int init,
-* AstUnitNormMapVtab *vtab, const char *name,
-* int ncoord, const double *centre )
-
-* Class Membership:
-* UnitNormMap initialiser.
-
-* Description:
-* This function is provided for use by class implementations to initialise
-* a new UnitNormMap object. It allocates memory (if necessary) to accommodate
-* the UnitNormMap plus any additional data associated with the derived class.
-* It then initialises a UnitNormMap 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 UnitNormMap at the start of the memory passed via the
-* "vtab" parameter.
-
-* Parameters:
-* mem
-* A pointer to the memory in which the UnitNormMap is to be initialised.
-* This must be of sufficient size to accommodate the UnitNormMap data
-* (sizeof(UnitNormMap)) 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 UnitNormMap (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 UnitNormMap
-* structure, so a valid value must be supplied even if not required for
-* allocating memory.
-* init
-* A logical flag indicating if the UnitNormMap'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 UnitNormMap.
-* 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.
-* centre
-* Pointer to an array of centres, one for each coordinate.
-
-* Returned Value:
-* A pointer to the new UnitNormMap.
-
-* 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: */
- AstUnitNormMap *new; /* Pointer to new UnitNormMap */
-
-/* Check the global status. */
- if( !astOK ) return NULL;
-
-/* Check centre */
- if( ncoord <= 0 ){
- astError( AST__BADSM, "The centre must have at least one axis", status );
- return NULL;
- }
-
-/* If necessary, initialise the virtual function table. */
- if( init ) astInitUnitNormMapVtab( vtab, name );
-
-/* Initialise. */
- new = NULL;
-
-/* Initialise a Mapping structure (the parent class) as the first component
- within the UnitNormMap structure, allocating memory if necessary. Specify that
- the Mapping should be defined in both the forward and inverse directions. */
- new = (AstUnitNormMap *) astInitMapping( mem, size, 0,
- (AstMappingVtab *) vtab, name,
- ncoord, ncoord+1, 1, 1 );
-
- if( astOK ) {
-
-/* Initialise the UnitNormMap data. */
-/* ---------------------------- */
-/* Allocate memory to hold the centre for each axis. */
- new->centre = (double *) astMalloc( sizeof(double)*(size_t)ncoord );
-
-/* Check the pointers can be used */
- if( astOK ){
-
-/* Store the centre for each axis. */
- int axis = 0;
- for( axis = 0; axis < ncoord; axis++ ){
- (new->centre)[ axis ] = centre ? centre[ axis ] : AST__BAD;
- }
-
- }
-
-/* If an error occurred, clean up by deleting the new UnitNormMap. */
- if( !astOK ) new = astDelete( new );
- }
-
-/* Return a pointer to the new UnitNormMap. */
- return new;
-}
-
-AstUnitNormMap *astLoadUnitNormMap_( void *mem, size_t size,
- AstUnitNormMapVtab *vtab, const char *name,
- AstChannel *channel, int *status ) {
-/*
-*+
-* Name:
-* astLoadUnitNormMap
-
-* Purpose:
-* Load a UnitNormMap.
-
-* Type:
-* Protected function.
-
-* Synopsis:
-* #include "unitnormmap.h"
-* AstUnitNormMap *astLoadUnitNormMap( void *mem, size_t size,
-* AstUnitNormMapVtab *vtab, const char *name,
-* AstChannel *channel )
-
-* Class Membership:
-* UnitNormMap loader.
-
-* Description:
-* This function is provided to load a new UnitNormMap 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
-* UnitNormMap 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 UnitNormMap at the start of the memory
-* passed via the "vtab" parameter.
-
-
-* Parameters:
-* mem
-* A pointer to the memory into which the UnitNormMap is to be
-* loaded. This must be of sufficient size to accommodate the
-* UnitNormMap data (sizeof(UnitNormMap)) 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 UnitNormMap (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 UnitNormMap 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(AstUnitNormMap) is used instead.
-* vtab
-* Pointer to the start of the virtual function table to be
-* associated with the new UnitNormMap. If this is NULL, a pointer
-* to the (static) virtual function table for the UnitNormMap 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 "UnitNormMap" is used instead.
-
-* Returned Value:
-* A pointer to the new UnitNormMap.
-
-* 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. */
-#define KEY_LEN 50 /* Maximum length of a keyword */
-
-/* Local Variables: */
- char buff[ KEY_LEN + 1 ]; /* Buffer for keyword string */
-
-/* Get a pointer to the thread specific global data structure. */
- astDECLARE_GLOBALS /* Pointer to thread-specific global data */
- astGET_GLOBALS(channel);
-
-/* Initialise. */
- AstUnitNormMap *new = NULL;
-
-/* 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 UnitNormMap. In this case the
- UnitNormMap belongs to this class, so supply appropriate values to be
- passed to the parent class loader (and its parent, etc.). */
- if( !vtab ) {
- size = sizeof( AstUnitNormMap );
- vtab = &class_vtab;
- name = "UnitNormMap";
-
-/* If required, initialise the virtual function table for this class. */
- if( !class_init ) {
- astInitUnitNormMapVtab( 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 UnitNormMap. */
- new = astLoadMapping( mem, size, (AstMappingVtab *) vtab, name,
- channel );
-
- if( astOK ) {
-
-/* Get the number of axis for the mapping. */
- int ncoord = astGetNin( (AstMapping *) new );
-
-/* Allocate memory to hold the centre. */
- new->centre = (double *) astMalloc( sizeof(double)*(size_t)ncoord );
-
-/* Read input data. */
-/* ================ */
-/* Request the input Channel to read all the input data appropriate to
- this class into the internal "values list". */
- astReadClassData( channel, "UnitNormMap" );
-
-/* Now read each individual data item from this list and use it to
- initialise the appropriate instance variable(s) for this class. */
-
-/* The centre. */
- int axis = 0;
- for( axis = 0; axis < ncoord; axis++ ){
- (void) sprintf( buff, "ctr%d", axis + 1 );
- (new->centre)[ axis ] = astReadDouble( channel, buff, 0.0 );
- }
- }
-
-/* If an error occurred, clean up by deleting the new UnitNormMap. */
- if( !astOK ) new = astDelete( new );
-
-/* Return the new UnitNormMap 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. */