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author | William Joye <wjoye@cfa.harvard.edu> | 2019-05-10 19:05:35 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2019-05-10 19:05:35 (GMT) |
commit | 51cd8ee68a63edc414c0fe3344ba0589ac5849dd (patch) | |
tree | 662741d231423544a0c4d8bec55d7c457a18c17e /ast/normmap.c | |
parent | beb90b7d3f526440250bba67e5ab07bb7eb7bbc3 (diff) | |
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upgrade ast 8.7.1
Diffstat (limited to 'ast/normmap.c')
-rw-r--r-- | ast/normmap.c | 1720 |
1 files changed, 1720 insertions, 0 deletions
diff --git a/ast/normmap.c b/ast/normmap.c new file mode 100644 index 0000000..3739739 --- /dev/null +++ b/ast/normmap.c @@ -0,0 +1,1720 @@ +/* +*class++ +* Name: +* NormMap + +* Purpose: +* Normalise coordinates using a supplied Frame. + +* Constructor Function: +c astNormMap +f AST_NORMMAP + +* Description: +* The NormMap class implements a Mapping which normalises coordinate +* values using the +c astNorm function +f AST_NORM routine +* of a supplied Frame. The number of inputs and outputs of a NormMap +* are both equal to the number of axes in the supplied Frame. +* +* The forward and inverse transformation of a NormMap are both +* defined but are identical (that is, they do not form a real inverse +* pair in that the inverse transformation does not undo the +* normalisation, instead it reapplies it). However, the +c astSimplify +f AST_SIMPLIFY +* function will replace neighbouring pairs of forward and inverse +* NormMaps by a single UnitMap (so long as the Frames encapsulated by +* the two NormMaps are equal - i.e. have the same class and the same +* attribute values). This means, for instance, that if a CmpMap contains +* a NormMap, the CmpMap will still cancel with its own inverse. + +* Inheritance: +* The NormMap class inherits from the Mapping class. + +* Attributes: +* The NormMap class does not define any new attributes beyond +* those which are applicable to all Mappings. + +* Functions: +c The NormMap class does not define any new functions beyond those +f The NormMap class does not define any new routines beyond those +* which are applicable to all Mappings. + +* Copyright: +* Copyright (C) 1997-2006 Council for the Central Laboratory of the +* Research Councils + +* Licence: +* This program is free software: you can redistribute it and/or +* modify it under the terms of the GNU Lesser General Public +* License as published by the Free Software Foundation, either +* version 3 of the License, or (at your option) any later +* version. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU Lesser General Public License for more details. +* +* You should have received a copy of the GNU Lesser General +* License along with this program. If not, see +* <http://www.gnu.org/licenses/>. + +* Authors: +* DSB: David S. Berry (Starlink) + +* History: +* 11-JUL-2005 (DSB): +* Original version. +* 23-AUG-2006 (DSB): +* Override astEqual. +* 8-NOV-2016 (DSB): +* - Allow multiple identical NormMaps in series to be simplified to +* a single NormMap. +* - Allow a NormMap that contains a basic Frame to be simplified +* to a UnitMap. +*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 NormMap + +/* 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 "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 "normmap.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 int *(* parent_mapsplit)( AstMapping *, int, const int *, AstMapping **, int * ); + +#if defined(THREAD_SAFE) +static int (* parent_managelock)( AstObject *, int, int, AstObject **, int * ); +#endif + + +#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(NormMap) + +/* Define macros for accessing each item of thread specific global data. */ +#define class_init astGLOBAL(NormMap,Class_Init) +#define class_vtab astGLOBAL(NormMap,Class_Vtab) + + +#include <pthread.h> + + +#else + + +/* Define the class virtual function table and its initialisation flag + as static variables. */ +static AstNormMapVtab 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. */ +AstNormMap *astNormMapId_( void *, const char *, ... ); + +/* Prototypes for Private Member Functions. */ +/* ======================================== */ +static AstMapping *RemoveRegions( AstMapping *, int * ); +static AstPointSet *Transform( AstMapping *, AstPointSet *, int, AstPointSet *, int * ); +static double Rate( AstMapping *, double *, int, int, 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 Equal( AstObject *, AstObject *, int * ); +static int *MapSplit( AstMapping *, int, const int *, AstMapping **, int * ); + +#if defined(THREAD_SAFE) +static int ManageLock( AstObject *, int, int, AstObject **, int * ); +#endif + + +/* Member functions. */ +/* ================= */ + +static int Equal( AstObject *this_object, AstObject *that_object, int *status ) { +/* +* Name: +* Equal + +* Purpose: +* Test if two NormMaps are equivalent. + +* Type: +* Private function. + +* Synopsis: +* #include "normmap.h" +* int Equal( AstObject *this, AstObject *that, int *status ) + +* Class Membership: +* NormMap 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 NormMaps are equivalent. + +* Parameters: +* this +* Pointer to the first Object (a NormMap). +* that +* Pointer to the second Object. +* status +* Pointer to the inherited status variable. + +* Returned Value: +* One if the NormMaps 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: */ + AstNormMap *that; + AstNormMap *this; + int result; + +/* Initialise. */ + result = 0; + +/* Check the global error status. */ + if ( !astOK ) return result; + +/* Obtain pointers to the two NormMap structures. */ + this = (AstNormMap *) this_object; + that = (AstNormMap *) that_object; + +/* Check the second object is a NormMap. We know the first is a + NormMap since we have arrived at this implementation of the virtual + function. */ + if( astIsANormMap( that ) ) { + +/* Check the Invert flags for the two NormMaps are equal. */ + if( astGetInvert( this ) == astGetInvert( that ) ) { + +/* Check the two Frames are equal. */ + if( astEqual( this->frame, that->frame ) ) { + result = 1; + } + } + } + +/* If an error occurred, clear the result value. */ + if ( !astOK ) result = 0; + +/* Return the result, */ + return result; +} + +void astInitNormMapVtab_( AstNormMapVtab *vtab, const char *name, int *status ) { +/* +*+ +* Name: +* astInitNormMapVtab + +* Purpose: +* Initialise a virtual function table for a NormMap. + +* Type: +* Protected function. + +* Synopsis: +* #include "normmap.h" +* void astInitNormMapVtab( AstNormMapVtab *vtab, const char *name ) + +* Class Membership: +* NormMap vtab initialiser. + +* Description: +* This function initialises the component of a virtual function +* table which is used by the NormMap 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 astIsANormMap) 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. */ + object = (AstObjectVtab *) vtab; + mapping = (AstMappingVtab *) vtab; + + mapping->RemoveRegions = RemoveRegions; + +#if defined(THREAD_SAFE) + parent_managelock = object->ManageLock; + object->ManageLock = ManageLock; +#endif + + parent_transform = mapping->Transform; + mapping->Transform = Transform; + + parent_mapsplit = mapping->MapSplit; + mapping->MapSplit = MapSplit; + +/* 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; + +/* Declare the copy constructor, destructor and class dump function. */ + astSetDump( vtab, Dump, "NormMap", "Normalise axis values" ); + astSetCopy( vtab, Copy ); + astSetDelete( 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) ); + } +} + +#if defined(THREAD_SAFE) +static int ManageLock( AstObject *this_object, int mode, int extra, + AstObject **fail, int *status ) { +/* +* Name: +* ManageLock + +* Purpose: +* Manage the thread lock on an Object. + +* Type: +* Private function. + +* Synopsis: +* #include "object.h" +* AstObject *ManageLock( AstObject *this, int mode, int extra, +* AstObject **fail, int *status ) + +* Class Membership: +* NormMap member function (over-rides the astManageLock protected +* method inherited from the parent class). + +* Description: +* This function manages the thread lock on the supplied Object. The +* lock can be locked, unlocked or checked by this function as +* deteremined by parameter "mode". See astLock for details of the way +* these locks are used. + +* Parameters: +* this +* Pointer to the Object. +* mode +* An integer flag indicating what the function should do: +* +* AST__LOCK: Lock the Object for exclusive use by the calling +* thread. The "extra" value indicates what should be done if the +* Object is already locked (wait or report an error - see astLock). +* +* AST__UNLOCK: Unlock the Object for use by other threads. +* +* AST__CHECKLOCK: Check that the object is locked for use by the +* calling thread (report an error if not). +* extra +* Extra mode-specific information. +* fail +* If a non-zero function value is returned, a pointer to the +* Object that caused the failure is returned at "*fail". This may +* be "this" or it may be an Object contained within "this". Note, +* the Object's reference count is not incremented, and so the +* returned pointer should not be annulled. A NULL pointer is +* returned if this function returns a value of zero. +* status +* Pointer to the inherited status variable. + +* Returned Value: +* A local status value: +* 0 - Success +* 1 - Could not lock or unlock the object because it was already +* locked by another thread. +* 2 - Failed to lock a POSIX mutex +* 3 - Failed to unlock a POSIX mutex +* 4 - Bad "mode" value supplied. + +* Notes: +* - This function attempts to execute even if an error has already +* occurred. +*/ + +/* Local Variables: */ + AstNormMap *this; /* Pointer to NormMap structure */ + int result; /* Returned status value */ + +/* Initialise */ + result = 0; + +/* Check the supplied pointer is not NULL. */ + if( !this_object ) return result; + +/* Obtain a pointers to the NormMap structure. */ + this = (AstNormMap *) this_object; + +/* Invoke the ManageLock method inherited from the parent class. */ + if( !result ) result = (*parent_managelock)( this_object, mode, extra, + fail, status ); + +/* Invoke the astManageLock method on any Objects contained within + the supplied Object. */ + if( !result ) result = astManageLock( this->frame, mode, extra, fail ); + + return result; + +} +#endif + +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 NormMap. + +* 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: +* NormMap 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 NormMap 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 NormMap 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 NormMap which is to be merged with +* its neighbours. This should be a cloned copy of the NormMap +* pointer contained in the array element "(*map_list)[where]" +* (see below). This pointer will not be annulled, and the +* NormMap it identifies will not be modified by this function. +* where +* Index in the "*map_list" array (below) at which the pointer +* to the nominated NormMap 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: */ + AstFrame *frm1; + AstFrame *frm2; + AstMapping *smap; + AstNormMap *map; + AstNormMap *nmap1; + AstNormMap *nmap2; + const char *class; + int cancel; + int map_inv; + int nax; + int result; + +/* Initialise. */ + result = -1; + +/* Check the inherited status. */ + if ( !astOK ) return result; + +/* Initialisation to avoid compiler warnings. */ + nax = 0; + +/* Get a pointer to this NormMap. */ + map = (AstNormMap *) this; + +/* Temporarily set its Invert flag to the requested value. */ + map_inv = astGetInvert( map ); + astSetInvert( map, ( *invert_list )[ where ] ); + +/* First try to simplify the NormMap by simplifying its encapsulated + Frame. Get its class. */ + smap = astSimplify( map->frame ); + class = astGetClass( smap ); + +/* If any simplification took place, create a new NormMap with the + simplified Frame. */ + if( smap != (AstMapping *) map->frame ) { + (void) astAnnul( ( *map_list )[ where ] ); + ( *map_list )[ where ] = (AstMapping *) astNormMap( (AstFrame *) smap, + "", status ); + result = where; + +/* If the encapsulated Frame is a basic Frame, we can safely assume that + the astNorm method does nothing, and so we can replace the NormMap with + a UnitMap. */ + } else if( class && !strcmp( class, "Frame" ) ) { + nax = astGetNin( smap ); + (void) astAnnul( ( *map_list )[ where ] ); + ( *map_list )[ where ] = (AstMapping *) astUnitMap( nax, "", status ); + result = where; + +/* The only other simplications which can be performed are a) to cancel a NormMap + with its own inverse in series, or b) to remove duplicated adjacent + NormMaps in series. */ + } else if( series ) { + +/* Indicate we have nothing to cancel with as yet. */ + cancel = -1; + +/* First consider the lower neighbour. */ + if( where > 0 && astIsANormMap( ( *map_list )[ where - 1 ] ) ) { + +/* Check the Invert flags are opposite */ + if( ( *invert_list )[ where ] != ( *invert_list )[ where - 1 ] ) { + nmap1 = map; + nmap2 = (AstNormMap *) ( *map_list )[ where - 1 ]; + +/* Check the encapsulated Frames are equal. */ + frm1 = nmap1->frame; + frm2 = nmap2->frame; + if( astEqual( frm1, frm2 ) ) cancel = where - 1; + nax = astGetNout( nmap1 ); + } + } + +/* Likewise consider the upper neighbour. */ + if( cancel == -1 && where + 1 < *nmap && + astIsANormMap( ( *map_list )[ where + 1 ] ) ) { + + if( ( *invert_list )[ where ] != ( *invert_list )[ where + 1 ] ) { + nmap1 = map; + nmap2 = (AstNormMap *) ( *map_list )[ where + 1 ]; + frm1 = nmap1->frame; + frm2 = nmap2->frame; + if( astEqual( frm1, frm2 ) ) cancel = where + 1; + nax = astGetNin( nmap1 ); + } + } + +/* If we can cancel with a neightbour, do so. */ + if( cancel != -1 ) { + (void) astAnnul( ( *map_list )[ where ] ); + (void) astAnnul( ( *map_list )[ cancel ] ); + ( *map_list )[ where ] = (AstMapping *) astUnitMap( nax, "", status ); + ( *invert_list )[ where ] = 0; + ( *map_list )[ cancel ] = (AstMapping *) astUnitMap( nax, "", status ); + ( *invert_list )[ cancel ] = 0; + result = ( cancel < where ) ? cancel : where; + +/* Otherwise, see if the nominated NormMap is followed by one or more + identical NormMaps, in which case we can remove all but one of the + NormMaps. */ + } else { + +/* Loop round all subsequent Mappings until the end of the list is + reached, or a Mapping that is not a NormMap is reached. On each pass + we replace the NormMap with a UnitMap. */ + nax = astGetNin( map ); + cancel = where; + while( ++cancel < *nmap && + astIsANormMap( ( *map_list )[ cancel ] ) ) { + +/* Check the Invert flags are equal. */ + if( ( *invert_list )[ where ] == ( *invert_list )[ cancel ] ) { + +/* Check the Frames are equal .*/ + nmap2 = (AstNormMap *) ( *map_list )[ cancel ]; + if( astEqual( map->frame, nmap2->frame ) ) { + +/* Replace the later NormMap with a UnitMap. */ + (void) astAnnul( ( *map_list )[ cancel ] ); + ( *map_list )[ cancel ] = (AstMapping *) astUnitMap( nax, + "", status ); + +/* We return the index of the first modified Mapping in the list, so do + not update "result" if this is not the first change. */ + if( result == -1 ) result = cancel; + } + } + } + } + } + +/* Free resources. */ + smap = astAnnul( smap ); + +/* Reset the original Invert attribute for the specified NormMap */ + astSetInvert( map, map_inv ); + +/* If an error occurred, clear the result value. */ + 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 +* NormMap. + +* Type: +* Private function. + +* Synopsis: +* #include "normmap.h" +* int *MapSplit( AstMapping *this, int nin, const int *in, AstMapping **map, int *status ) + +* Class Membership: +* NormMap 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 NormMap. This is only possible if the specified inputs +* correspond to some subset of the NormMap outputs. That is, there +* must exist a subset of the NormMap outputs for which each output +* depends only on the selected NormMap inputs, and not on any of the +* inputs which have not been selected. If this condition is not met +* by the supplied NormMap, then a NULL Mapping is returned. + +* Parameters: +* this +* Pointer to the NormMap to be split (the NormMap 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 NormMap, 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 NormMap 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 NormMap. 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: */ + AstFrame *frm2; /* Pointer to new Frame */ + AstNormMap *this; /* Pointer to NormMap structure */ + int *result; /* Pointer to returned array */ + +/* Initialise */ + result = NULL; + *map = NULL; + +/* Check the global error status. */ + if ( !astOK ) return result; + +/* Invoke the parent astMapSplit method to see if it can do the job. */ + result = (*parent_mapsplit)( this_map, nin, in, map, status ); + +/* If not, we provide a special implementation here. */ + if( !result ) { + +/* Get a pointer to the NormMap structure. */ + this = (AstNormMap *) this_map; + +/* Pick the requried axes from the encapsulated Frame. */ + frm2 = astPickAxes( this->frame, nin, in, NULL ); + +/* Create a new NormMap from this. */ + *map = (AstMapping *) astNormMap( frm2, "", status ); + +/* The returned list of output axes is a copy the supplied list of input + axes. */ + result = astStore( NULL, in, sizeof( int )*(size_t) nin ); + +/* Free resources. */ + frm2 = astAnnul( frm2 ); + } + +/* 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 "normmap.h" +* result = Rate( AstMapping *this, double *at, int ax1, int ax2, int *status ) + +* Class Membership: +* NormMap 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. + +*/ + + return ( ax1 == ax2 ) ? 1.0 : 0.0; +} + +static AstMapping *RemoveRegions( AstMapping *this_mapping, int *status ) { +/* +* Name: +* RemoveRegions + +* Purpose: +* Remove any Regions from a Mapping. + +* Type: +* Private function. + +* Synopsis: +* #include "normmap.h" +* AstMapping *RemoveRegions( AstMapping *this, int *status ) + +* Class Membership: +* NormMap method (over-rides the astRemoveRegions method inherited +* from the Mapping class). + +* Description: +* This function searches the supplied Mapping (which may be a +* compound Mapping such as a CmpMap) for any component Mappings +* that are instances of the AST Region class. It then creates a new +* Mapping from which all Regions have been removed. If a Region +* cannot simply be removed (for instance, if it is a component of a +* parallel CmpMap), then it is replaced with an equivalent UnitMap +* in the returned Mapping. +* +* The implementation provided by the NormMap class invokes the +* astRemoveRegions method on the encapsulated Frame, and returns a +* new NormMap containing the resulting Frame. + +* Parameters: +* this +* Pointer to the original Region. +* status +* Pointer to the inherited status variable. + +* Returned Value: +* A pointer to the modified mapping. + +* Notes: +* - A NULL pointer value will be returned if this function is +* invoked with the AST error status set, or if it should fail for +* any reason. +*/ + +/* Local Variables: */ + AstFrame *newfrm; /* New component Frame */ + AstMapping *result; /* Result pointer to return */ + AstNormMap *new; /* Pointer to new MormMap */ + AstNormMap *this; /* Pointer to NormMap structure */ + +/* Initialise. */ + result = NULL; + +/* Check the global error status. */ + if ( !astOK ) return result; + +/* Get a pointer to the NormMap. */ + this = (AstNormMap *) this_mapping; + +/* Invoke the astRemoveRegions method on the component Frame. */ + newfrm = astRemoveRegions( this->frame ); + +/* If the Frame was not modified, just return a clone of the supplied + pointer. */ + if( this->frame == newfrm ) { + result = astClone( this ); + +/* Otherwise, we need to create a new NormMap to return. We take a deep + copy of the supplied NormMap and then modify the Frame so that we + retain any extra information in the supplied NormMap. */ + } else { + new = astCopy( this ); + (void) astAnnul( new->frame ); + new->frame = astClone( newfrm ); + result = (AstMapping *) new; + } + +/* Free resources. */ + newfrm = astAnnul( newfrm ); + +/* Annul the returned Mapping if an error has occurred. */ + if( !astOK ) result = astAnnul( result ); + +/* Return the result. */ + return result; +} + +static AstPointSet *Transform( AstMapping *this, AstPointSet *in, + int forward, AstPointSet *out, int *status ) { +/* +* Name: +* Transform + +* Purpose: +* Apply a NormMap to transform a set of points. + +* Type: +* Private function. + +* Synopsis: +* #include "normmap.h" +* AstPointSet *Transform( AstMapping *this, AstPointSet *in, +* int forward, AstPointSet *out, int *status ) + +* Class Membership: +* NormMap member function (over-rides the astTransform protected +* method inherited from the Mapping class). + +* Description: +* This function takes a NormMap 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 NormMap. +* 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 NormMap 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 */ + AstNormMap *map; /* Pointer to NormMap to be applied */ + double **ptr_in; /* Pointer to input coordinate data */ + double **ptr_out; /* Pointer to output coordinate data */ + double *work; /* Work space for a single point */ + 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 NormMap. */ + map = (AstNormMap *) 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 ); + work = astMalloc( sizeof( double )* ncoord_in ); + +/* Perform coordinate arithmetic. */ +/* ------------------------------ */ + if ( astOK ) { + for ( point = 0; point < npoint; point++ ) { + for ( coord = 0; coord < ncoord_in; coord++ ) { + work[ coord ] = ptr_in[ coord ][ point ]; + } + astNorm( map->frame, work ); + for ( coord = 0; coord < ncoord_in; coord++ ) { + ptr_out[ coord ][ point ] = work[ coord ]; + } + } + } + +/* Free resources */ + work = astFree( work ); + +/* 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 NormMap objects. + +* Type: +* Private function. + +* Synopsis: +* void Copy( const AstObject *objin, AstObject *objout, int *status ) + +* Description: +* This function implements the copy constructor for NormMap objects. + +* Parameters: +* objin +* Pointer to the object to be copied. +* objout +* Pointer to the object being constructed. +* status +* Pointer to the inherited status variable. + +* Returned Value: +* void + +* Notes: +* - This constructor makes a deep copy, including a copy of the +* Frame within the NormMap. +*/ + +/* Local Variables: */ + AstNormMap *in; /* Pointer to input NormMap */ + AstNormMap *out; /* Pointer to output NormMap */ + +/* Check the global error status. */ + if ( !astOK ) return; + + in = (AstNormMap *) objin; + out = (AstNormMap *) objout; + out->frame = astCopy( in->frame ); +} + +/* Destructor. */ +/* ----------- */ +static void Delete( AstObject *obj, int *status ) { +/* +* Name: +* Delete + +* Purpose: +* Destructor for NormMap objects. + +* Type: +* Private function. + +* Synopsis: +* void Delete( AstObject *obj, int *status ) + +* Description: +* This function implements the destructor for NormMap objects. + +* Parameters: +* obj +* Pointer to the object to be deleted. +* status +* Pointer to the inherited status variable. + +* Returned Value: +* void + +* Notes: +* This function attempts to execute even if the global error status is +* set. +*/ + +/* Local Variables: */ + AstNormMap *this; /* Pointer to NormMap */ + + this = (AstNormMap *) obj; + this->frame = astAnnul( this->frame ); + +} + +/* Dump function. */ +/* -------------- */ +static void Dump( AstObject *this_object, AstChannel *channel, int *status ) { +/* +* Name: +* Dump + +* Purpose: +* Dump function for NormMap 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 NormMap class to an output Channel. + +* Parameters: +* this +* Pointer to the NormMap 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: */ + AstNormMap *this; /* Pointer to the NormMap structure */ + +/* Check the global error status. */ + if ( !astOK ) return; + +/* Obtain a pointer to the NormMap structure. */ + this = (AstNormMap *) this_object; + +/* Write out values representing the instance variables for the + NormMap class. Accompany these with appropriate comment strings, + possibly depending on the values being written.*/ + +/* Frame. */ +/* ------ */ + astWriteObject( channel, "Frame", 1, 1, this->frame, + "Frame defining the normalisation" ); +} + +/* Standard class functions. */ +/* ========================= */ +/* Implement the astIsANormMap and astCheckNormMap functions using the macros + defined for this purpose in the "object.h" header file. */ +astMAKE_ISA(NormMap,Mapping) +astMAKE_CHECK(NormMap) + +AstNormMap *astNormMap_( void *frame_void, const char *options, int *status, ...) { +/* +*++ +* Name: +c astNormMap +f AST_NORMMAP + +* Purpose: +* Create a NormMap. + +* Type: +* Public function. + +* Synopsis: +c #include "normmap.h" +c AstNormMap *astNormMap( AstFrame *frame, const char *options, ... ) +f RESULT = AST_NORMMAP( FRAME, OPTIONS, STATUS ) + +* Class Membership: +* NormMap constructor. + +* Description: +* This function creates a new NormMap and optionally initialises its +* attributes. +* +* A NormMap is a Mapping which normalises coordinate values using the +c astNorm function +f AST_NORM routine +* of the supplied Frame. The number of inputs and outputs of a NormMap +* are both equal to the number of axes in the supplied Frame. +* +* The forward and inverse transformation of a NormMap are both +* defined but are identical (that is, they do not form a real inverse +* pair in that the inverse transformation does not undo the +* normalisation, instead it reapplies it). However, the +c astSimplify +f AST_SIMPLIFY +* function will replace neighbouring pairs of forward and inverse +* NormMaps by a single UnitMap (so long as the Frames encapsulated by +* the two NormMaps are equal - i.e. have the same class and the same +* attribute values). This means, for instance, that if a CmpMap contains +* a NormMap, the CmpMap will still cancel with its own inverse. + +* Parameters: +c frame +f FRAME = INTEGER (Given) +* A pointer to the Frame which is to be used to normalise the +* supplied axis values. +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 NormMap. 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 NormMap. 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 astNormMap() +f AST_NORMMAP = INTEGER +* A pointer to the new NormMap. + +* 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 */ + AstFrame *frame; /* The Frame pointer */ + AstNormMap *new; /* Pointer to new NormMap */ + 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; + +/* Obtain and validate pointers to the Frame structures provided. */ + frame = astCheckFrame( frame_void ); + +/* Initialise the NormMap, allocating memory and initialising the + virtual function table as well if necessary. */ + new = astInitNormMap( NULL, sizeof( AstNormMap ), !class_init, &class_vtab, + "NormMap", frame ); + if( astOK ) { + +/* 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 NormMap'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 NormMap. */ + return new; +} + +AstNormMap *astNormMapId_( void *frame_void, const char *options, ... ) { +/* +* Name: +* astNormMapId_ + +* Purpose: +* Create a NormMap. + +* Type: +* Private function. + +* Synopsis: +* #include "normmap.h" +* AstNormMap *astNormMapId_( int ncoord, double zoom, +* const char *options, ... ) + +* Class Membership: +* NormMap constructor. + +* Description: +* This function implements the external (public) interface to the +* astNormMap constructor function. It returns an ID value (instead +* of a true C pointer) to external users, and must be provided +* because astNormMap_ 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 astNormMap_ 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 astNormMap_. + +* Returned Value: +* The ID value associated with the new NormMap. +*/ + +/* Local Variables: */ + astDECLARE_GLOBALS /* Pointer to thread-specific global data */ + AstFrame *frame; /* The Frame pointer */ + AstNormMap *new; /* Pointer to new NormMap */ + va_list args; /* Variable argument list */ + + int *status; /* Pointer to inherited status value */ + +/* Get a pointer to the thread specific global data structure. */ + astGET_GLOBALS(NULL); + +/* Get a pointer to the inherited status value. */ + status = astGetStatusPtr; + +/* Check the global status. */ + if ( !astOK ) return NULL; + +/* Obtain and validate pointers to the Frame structures provided. */ + frame = astVerifyFrame( astMakePointer( frame_void ) ); + +/* Initialise the NormMap, allocating memory and initialising the + virtual function table as well if necessary. */ + new = astInitNormMap( NULL, sizeof( AstNormMap ), !class_init, &class_vtab, + "NormMap", frame ); + +/* 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 NormMap'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 NormMap. */ + return astMakeId( new ); +} + +AstNormMap *astInitNormMap_( void *mem, size_t size, int init, + AstNormMapVtab *vtab, const char *name, + AstFrame *frame, int *status ) { +/* +*+ +* Name: +* astInitNormMap + +* Purpose: +* Initialise a NormMap. + +* Type: +* Protected function. + +* Synopsis: +* #include "normmap.h" +* AstNormMap *astInitNormMap( void *mem, size_t size, int init, +* AstNormMapVtab *vtab, const char *name, +* AstFrame *frame ) + +* Class Membership: +* NormMap initialiser. + +* Description: +* This function is provided for use by class implementations to initialise +* a new NormMap object. It allocates memory (if necessary) to accommodate +* the NormMap plus any additional data associated with the derived class. +* It then initialises a NormMap 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 NormMap at the start of the memory passed via the +* "vtab" parameter. + +* Parameters: +* mem +* A pointer to the memory in which the NormMap is to be initialised. +* This must be of sufficient size to accommodate the NormMap data +* (sizeof(NormMap)) 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 NormMap (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 NormMap +* structure, so a valid value must be supplied even if not required for +* allocating memory. +* init +* A logical flag indicating if the NormMap'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 NormMap. +* 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). +* frame +* The Frame to use to do the normalisations. + +* Returned Value: +* A pointer to the new NormMap. + +* 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: */ + AstNormMap *new; /* Pointer to new NormMap */ + int ncoord; /* Number of input and output coords */ + +/* Check the global status. */ + if ( !astOK ) return NULL; + +/* If necessary, initialise the virtual function table. */ + if ( init ) astInitNormMapVtab( vtab, name ); + +/* Initialise. */ + new = NULL; + +/* Get the number of axes in the Frame. */ + ncoord = astGetNaxes( frame ); + +/* Initialise a Mapping structure (the parent class) as the first component + within the NormMap structure, allocating memory if necessary. Specify that + the Mapping should be defined in both the forward and inverse directions. */ + new = (AstNormMap *) astInitMapping( mem, size, 0, + (AstMappingVtab *) vtab, name, + ncoord, ncoord, 1, 1 ); + + if ( astOK ) { + +/* Initialise the NormMap data. */ +/* ---------------------------- */ +/* Store a pointer to the Frame. */ + new->frame = astClone( frame ); + +/* If an error occurred, clean up by deleting the new NormMap. */ + if ( !astOK ) new = astDelete( new ); + } + +/* Return a pointer to the new NormMap. */ + return new; +} + +AstNormMap *astLoadNormMap_( void *mem, size_t size, + AstNormMapVtab *vtab, const char *name, + AstChannel *channel, int *status ) { +/* +*+ +* Name: +* astLoadNormMap + +* Purpose: +* Load a NormMap. + +* Type: +* Protected function. + +* Synopsis: +* #include "normmap.h" +* AstNormMap *astLoadNormMap( void *mem, size_t size, +* AstNormMapVtab *vtab, const char *name, +* AstChannel *channel ) + +* Class Membership: +* NormMap loader. + +* Description: +* This function is provided to load a new NormMap 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 +* NormMap 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 NormMap at the start of the memory +* passed via the "vtab" parameter. + + +* Parameters: +* mem +* A pointer to the memory into which the NormMap is to be +* loaded. This must be of sufficient size to accommodate the +* NormMap data (sizeof(NormMap)) 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 NormMap (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 NormMap 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(AstNormMap) is used instead. +* vtab +* Pointer to the start of the virtual function table to be +* associated with the new NormMap. If this is NULL, a pointer +* to the (static) virtual function table for the NormMap 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 "NormMap" is used instead. + +* Returned Value: +* A pointer to the new NormMap. + +* 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 */ + AstNormMap *new; /* Pointer to the new NormMap */ + +/* 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 NormMap. In this case the + NormMap belongs to this class, so supply appropriate values to be + passed to the parent class loader (and its parent, etc.). */ + if ( !vtab ) { + size = sizeof( AstNormMap ); + vtab = &class_vtab; + name = "NormMap"; + +/* If required, initialise the virtual function table for this class. */ + if ( !class_init ) { + astInitNormMapVtab( 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 NormMap. */ + 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, "NormMap" ); + +/* 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. */ + +/* Frame. */ +/* ------ */ + new->frame = astReadObject( channel, "frame", NULL ); + +/* If an error occurred, clean up by deleting the new NormMap. */ + if ( !astOK ) new = astDelete( new ); + } + +/* Return the new NormMap 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. */ + + + + |