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author | William Joye <wjoye@cfa.harvard.edu> | 2018-01-09 19:06:55 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2018-01-09 19:06:55 (GMT) |
commit | 01e0ebfe59d9028b0246ec4a549bd7528ada94eb (patch) | |
tree | a6c5b54db03177a1c8f3e7fb531990dfbc7bae39 /ast/unitnormmap.c | |
parent | d64cf9c0bd23e752867b149be636d1bbd4501cf4 (diff) | |
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update ast 8.6.2
Diffstat (limited to 'ast/unitnormmap.c')
-rw-r--r-- | ast/unitnormmap.c | 1666 |
1 files changed, 1666 insertions, 0 deletions
diff --git a/ast/unitnormmap.c b/ast/unitnormmap.c new file mode 100644 index 0000000..c9e69c2 --- /dev/null +++ b/ast/unitnormmap.c @@ -0,0 +1,1666 @@ +/* +*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. +* If the norm is 0, then the output of the forward transformation is AST__BAD +* for each component of the unit vector and 0 for the norm (the final value). +* +* 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. +* If the provided norm is 0 then the other input values are ignored, +* and the output vector is the centre. +* +* Example: if centre = [1, -1] then [5, 2] transforms to [4, 3] after subtracting the centre; +* the norm is 5, so the output is [0.8, 0.6, 5]. +* +* 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) +* DSB: David S Berry (EAO) + +* History: +* 20-APR-2016 (RO): +* Original version. +* 17-MAR-2017 (DSB): +* Fix some memory leaks in MakeMergedMap. +*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 ); + if( astOK ) { + int coord = 0; + for( coord = 0; coord < nin; coord++ ){ + newcentre[coord] = unm->centre[coord] - shiftmult*shiftmap->shift[coord]; + } + retmap = (AstMapping *) astUnitNormMap( nin, newcentre, "", status ); + newcentre = 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); + Do not create a returned Mapping (but do free the newcentre memory) 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 ); + if( astOK ) { + int coord = 0; + int ok = 1; + for( coord = 0; coord < nin; coord++ ){ + if( !EQUAL( winmap->b[coord], 1.0 )) ok = 0; + newcentre[coord] = unm->centre[coord] - shiftmult*winmap->a[coord]; + } + if( ok ) retmap = (AstMapping *) astUnitNormMap( nin, newcentre, "", status ); + newcentre = 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 ); + if( astOK ) { + 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 ); + newcentre = astFree( (void *) newcentre ); + } + } else if( type2 == 3 ) { + if( !astGetInvert( map1 )) return NULL; /* UnitNormMap(forward) + WinMap not supported */ + +/* UnitNormMap(inverted) + WinMap = UnitNormMap(inverted); + Do not create a returned Mapping - but do free the newcentre memory - 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 ); + if( astOK ) { + int coord = 0; + int ok = 1; + for( coord = 0; coord < nin; coord++ ){ + if( !EQUAL( winmap->b[coord], 1.0 )) ok = 0; + newcentre[coord] = unm->centre[coord] + shiftmult*winmap->a[coord]; + } + if( ok ) retmap = (AstMapping *) astUnitNormMap( nin, newcentre, "Invert=1", status ); + newcentre = 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 ); + if( astOK ) { + int coord = 0; + for( coord = 0; coord < nin; coord++ ){ + shift[coord] = unm2->centre[coord] - unm1->centre[coord]; + } + retmap = (AstMapping *) astShiftMap( nin, shift, "", status ); + shift = 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 outputs 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 ){ + +/* The norm is 0, so the unit vector (first nin components of output) is unknown */ + int coord = 0; + for( coord = 0; coord < ncoord_out - 1; coord++ ){ + ptr_out[coord][point] = AST__BAD; + } + ptr_out[ncoord_out - 1][point] = 0; + 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 if( norm == 0 ){ + +/* Norm is 0 for this point; set the output to the centre */ + int coord = 0; + for( coord = 0; coord < ncoord_out; coord++ ){ + ptr_out[coord][point] = map->centre[coord]; + } + } 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. +* If the norm is 0, then the output of the forward transformation is AST__BAD +* for each component of the unit vector and 0 for the norm (the final value). +* +* 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. +* If the provided norm is 0 then the other input values are ignored, +* and the output vector is the centre. +* +* Example: if centre = [1, -1] then [5, 2] transforms to [4, 3] after subtracting the centre; +* the norm is 5, so the output is [0.8, 0.6, 5]. +* +* 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. */ |