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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/unitmap.c | |
parent | d64cf9c0bd23e752867b149be636d1bbd4501cf4 (diff) | |
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update ast 8.6.2
Diffstat (limited to 'ast/unitmap.c')
-rw-r--r-- | ast/unitmap.c | 1425 |
1 files changed, 1425 insertions, 0 deletions
diff --git a/ast/unitmap.c b/ast/unitmap.c new file mode 100644 index 0000000..a371031 --- /dev/null +++ b/ast/unitmap.c @@ -0,0 +1,1425 @@ +/* +*class++ +* Name: +* UnitMap + +* Purpose: +* Unit (null) Mapping. + +* Constructor Function: +c astUnitMap +f AST_UNITMAP + +* Description: +* A UnitMap is a unit (null) Mapping that has no effect on the +* coordinates supplied to it. They are simply copied. This can be +* useful if a Mapping is required (e.g. to pass to another +c function) but you do not want it to have any effect. +f routine) but you do not want it to have any effect. +* The Nin and Nout attributes of a UnitMap are always equal and +* are specified when it is created. + +* Inheritance: +* The UnitMap class inherits from the Mapping class. + +* Attributes: +* The UnitMap class does not define any new attributes beyond +* those which are applicable to all Mappings. + +* Functions: +c The UnitMap class does not define any new functions beyond those +f The UnitMap class does not define any new routines beyond those +* which are applicable to all Mappings. + +* Copyright: +* Copyright (C) 1997-2006 Council for the Central Laboratory of the +* Research Councils + +* Licence: +* This program is free software: you can redistribute it and/or +* modify it under the terms of the GNU Lesser General Public +* License as published by the Free Software Foundation, either +* version 3 of the License, or (at your option) any later +* version. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU Lesser General Public License for more details. +* +* You should have received a copy of the GNU Lesser General +* License along with this program. If not, see +* <http://www.gnu.org/licenses/>. + +* Authors: +* RFWS: R.F. Warren-Smith (Starlink) +* DSB: David S Berry (JAC, Hawaii) + +* History: +* 7-FEB-1996 (RFWS): +* Original version. +* 13-DEC-1996 (RFWS): +* Over-ride the astMapMerge method. +* 8-JAN-2003 (DSB): +* Changed private InitVtab method to protected astInitUnitMapVtab +* method. +* 10-MAY-2006 (DSB): +* Override astEqual. +* 17-FEB-2012 (DSB): +* In Transform, do not copy the coordinate values if the input and +* output array are the same. +*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 UnitMap + +/* Include files. */ +/* ============== */ +/* Interface definitions. */ +/* ---------------------- */ + +#include "globals.h" /* Thread-safe global data access */ +#include "error.h" /* Error reporting facilities */ +#include "object.h" /* Base Object class */ +#include "memory.h" /* AST memory management */ +#include "pointset.h" /* Sets of points/coordinates */ +#include "mapping.h" /* Coordinate mappings (parent class) */ +#include "unitmap.h" /* Interface definition for this class */ + +/* Error code definitions. */ +/* ----------------------- */ +#include "ast_err.h" /* AST error codes */ + +/* C header files. */ +/* --------------- */ +#include <stdarg.h> +#include <stddef.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 * ); + + +#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(UnitMap) + +/* Define macros for accessing each item of thread specific global data. */ +#define class_init astGLOBAL(UnitMap,Class_Init) +#define class_vtab astGLOBAL(UnitMap,Class_Vtab) + + +#include <pthread.h> + + +#else + + +/* Define the class virtual function table and its initialisation flag + as static variables. */ +static AstUnitMapVtab 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. */ +AstUnitMap *astUnitMapId_( int, const char *, ... ); + +/* Prototypes for Private Member Functions. */ +/* ======================================== */ +static AstPointSet *Transform( AstMapping *, AstPointSet *, int, AstPointSet *, int * ); +static double Rate( AstMapping *, double *, int, int, int * ); +static int *MapSplit( AstMapping *, int, const int *, AstMapping **, int * ); +static int Equal( AstObject *, AstObject *, int * ); +static int GetIsLinear( AstMapping *, int * ); +static int MapMerge( AstMapping *, int, int, int *, AstMapping ***, int **, int * ); +static void Dump( AstObject *, AstChannel *, int * ); + +/* Member functions. */ +/* ================= */ +static int Equal( AstObject *this_object, AstObject *that_object, int *status ) { +/* +* Name: +* Equal + +* Purpose: +* Test if two UnitMaps are equivalent. + +* Type: +* Private function. + +* Synopsis: +* #include "unitmap.h" +* int Equal( AstObject *this, AstObject *that, int *status ) + +* Class Membership: +* UnitMap 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 UnitMaps are equivalent. + +* Parameters: +* this +* Pointer to the first Object (a UnitMap). +* that +* Pointer to the second Object. +* status +* Pointer to the inherited status variable. + +* Returned Value: +* One if the UnitMaps 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: */ + AstUnitMap *that; + AstUnitMap *this; + int result; + +/* Initialise. */ + result = 0; + +/* Check the global error status. */ + if ( !astOK ) return result; + +/* Obtain pointers to the two UnitMap structures. */ + this = (AstUnitMap *) this_object; + that = (AstUnitMap *) that_object; + +/* Check the second object is a UnitMap. We know the first is a + UnitMap since we have arrived at this implementation of the virtual + function. */ + if( astIsAUnitMap( that ) ) { + +/* Get the number of inputs check they are the same for both. */ + result = ( astGetNin( this ) == astGetNin( that ) ); + + } + +/* If an error occurred, clear the result value. */ + if ( !astOK ) result = 0; + +/* Return the result, */ + return result; +} + +static int GetIsLinear( AstMapping *this_mapping, int *status ){ +/* +* Name: +* GetIsLinear + +* Purpose: +* Return the value of the IsLinear attribute for a UnitMap. + +* Type: +* Private function. + +* Synopsis: +* #include "mapping.h" +* void GetIsLinear( AstMapping *this, int *status ) + +* Class Membership: +* UnitMap 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 UnitMap. +* status +* Pointer to the inherited status variable. +*/ + return 1; +} + +void astInitUnitMapVtab_( AstUnitMapVtab *vtab, const char *name, int *status ) { +/* +*+ +* Name: +* astInitUnitMapVtab + +* Purpose: +* Initialise a virtual function table for a UnitMap. + +* Type: +* Protected function. + +* Synopsis: +* #include "unitmap.h" +* void astInitUnitMapVtab( AstUnitMapVtab *vtab, const char *name ) + +* Class Membership: +* UnitMap vtab initialiser. + +* Description: +* This function initialises the component of a virtual function +* table which is used by the UnitMap 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 astIsAUnitMap) 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. */ + +/* None. */ + +/* Save the inherited pointers to methods that will be extended, and + replace them with pointers to the new member functions. */ + object = (AstObjectVtab *) vtab; + mapping = (AstMappingVtab *) vtab; + + parent_transform = mapping->Transform; + mapping->Transform = Transform; + +/* Store replacement pointers for methods which will be over-ridden by + new member functions implemented here. */ + object->Equal = Equal; + mapping->MapMerge = MapMerge; + mapping->MapSplit = MapSplit; + mapping->Rate = Rate; + mapping->GetIsLinear = GetIsLinear; + +/* Declare the class dump function. There is no copy constructor or + destructor. */ + astSetDump( vtab, Dump, "UnitMap", "Unit (null) Mapping" ); + +/* 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 UnitMap. + +* 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: +* UnitMap 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 UnitMap 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 UnitMap 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 UnitMap which is to be merged with +* its neighbours. This should be a cloned copy of the UnitMap +* pointer contained in the array element "(*map_list)[where]" +* (see below). This pointer will not be annulled, and the +* UnitMap it identifies will not be modified by this function. +* where +* Index in the "*map_list" array (below) at which the pointer +* to the nominated UnitMap resides. +* series +* A non-zero value indicates that the sequence of Mappings to +* be simplified will be applied in series (i.e. one after the +* other), whereas a zero value indicates that they will be +* applied in parallel (i.e. on successive sub-sets of the +* input/output coordinates). +* nmap +* Address of an int which counts the number of Mappings in the +* sequence. On entry this should be set to the initial number +* of Mappings. On exit it will be updated to record the number +* of Mappings remaining after simplification. +* map_list +* Address of a pointer to a dynamically allocated array of +* Mapping pointers (produced, for example, by the astMapList +* method) which identifies the sequence of Mappings. On entry, +* the initial sequence of Mappings to be simplified should be +* supplied. +* +* On exit, the contents of this array will be modified to +* reflect any simplification carried out. Any form of +* simplification may be performed. This may involve any of: (a) +* removing Mappings by annulling any of the pointers supplied, +* (b) replacing them with pointers to new Mappings, (c) +* inserting additional Mappings and (d) changing their order. +* +* The intention is to reduce the number of Mappings in the +* sequence, if possible, and any reduction will be reflected in +* the value of "*nmap" returned. However, simplifications which +* do not reduce the length of the sequence (but improve its +* execution time, for example) may also be performed, and the +* sequence might conceivably increase in length (but normally +* only in order to split up a Mapping into pieces that can be +* more easily merged with their neighbours on subsequent +* invocations of this function). +* +* If Mappings are removed from the sequence, any gaps that +* remain will be closed up, by moving subsequent Mapping +* pointers along in the array, so that vacated elements occur +* at the end. If the sequence increases in length, the array +* will be extended (and its pointer updated) if necessary to +* accommodate any new elements. +* +* Note that any (or all) of the Mapping pointers supplied in +* this array may be annulled by this function, but the Mappings +* to which they refer are not modified in any way (although +* they may, of course, be deleted if the annulled pointer is +* the final one). +* invert_list +* Address of a pointer to a dynamically allocated array which, +* on entry, should contain values to be assigned to the Invert +* attributes of the Mappings identified in the "*map_list" +* array before they are applied (this array might have been +* produced, for example, by the astMapList method). These +* values will be used by this function instead of the actual +* Invert attributes of the Mappings supplied, which are +* ignored. +* +* On exit, the contents of this array will be updated to +* correspond with the possibly modified contents of the +* "*map_list" array. If the Mapping sequence increases in +* length, the "*invert_list" array will be extended (and its +* pointer updated) if necessary to accommodate any new +* elements. +* status +* Pointer to the inherited status variable. + +* Returned Value: +* If simplification was possible, the function returns the index +* in the "map_list" array of the first element which was +* modified. Otherwise, it returns -1 (and makes no changes to the +* arrays supplied). + +* Notes: +* - A value of -1 will be returned if this function is invoked +* with the global error status set, or if it should fail for any +* reason. +*/ + +/* Local Variables: */ + AstMapping *new; /* Pointer to replacement UnitMap */ + const char *class; /* Pointer to Mapping class string */ + int i1; /* Index of first UnitMap to merge */ + int i2; /* Index of last UnitMap to merge */ + int i; /* Loop counter for Mappings */ + int ngone; /* Number of UnitMaps eliminated */ + int nin; /* Number of coordinates for UnitMap */ + int result; /* Result value to return */ + +/* Initialise. */ + result = -1; + +/* Check the global error status. */ + if ( !astOK ) return result; + +/* If the Mapping sequence consists of a single UnitMap, simply check + if the asociated Invert flag is set, and clear it if necessary. */ + if ( *nmap == 1 ) { + if ( ( *invert_list )[ 0 ] ) { + ( *invert_list )[ 0 ] = 0; + +/* Note if the Mapping sequence was modified. */ + result = 0; + } + +/* In series. */ +/* ========== */ +/* If a UnitMap occurs in series with any other Mapping, it can simply + be eliminated, so annul its Mapping pointer. */ + } else if ( *nmap > 1 ) { + if ( series ) { + ( *map_list )[ where ] = astAnnul( ( *map_list )[ where ] ); + +/* Loop to move any following pointers and their Invert flags down in + the array to fill the gap, and clear the vacated elements at the + end of the arrays. */ + for ( i = where + 1; i < *nmap; i++ ) { + ( *map_list )[ i - 1 ] = ( *map_list )[ i ]; + ( *invert_list )[ i - 1 ] = ( *invert_list )[ i ]; + } + ( *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 = where; + +/* In parallel. */ +/* ============ */ +/* If a UnitMap occurs in parallel with other Mappings, it can be + merged with any UnitMaps on either side of itself. */ + } else { + +/* Initialise indices to identify any adjacent UnitMaps and the number + of coordinates to be handled by the replacement. */ + i1 = i2 = where; + nin = astGetNin( ( *map_list )[ where ] ); + +/* Loop to inspect earlier Mappings, obtaining the Mapping Class name + and checking it is "UnitMap". Quit looping as soon as any other + class of Mapping is found. */ + while ( i1 - 1 >= 0 ) { + class = astGetClass( ( *map_list )[ i1 - 1 ] ); + if ( !astOK || strcmp( class, "UnitMap" ) ) break; + +/* Update the index of the earliest UnitMap that is to be merged and + increment the total number of coordinates involved. */ + i1--; + nin += astGetNin( ( *map_list )[ i1 ] ); + } + +/* Repeat the above process to inspect any later Mappings in the + sequence. */ + while ( i2 + 1 < *nmap ) { + class = astGetClass( ( *map_list )[ i2 + 1 ] ); + if ( !astOK || strcmp( class, "UnitMap" ) ) break; + i2++; + nin += astGetNin( ( *map_list )[ i2 ] ); + } + +/* Calculate the net number of Mappings that can be removed from the + sequence and check if this is zero, meaning that there were no + adjacent UnitMaps to merge with. */ + if ( astOK ) { + ngone = i2 - i1; + if ( !ngone ) { + +/* If so, simply check if the nominated UnitMap's Invert flag is set, + and clear it if necessary. */ + if ( ( *invert_list )[ where ] ) { + ( *invert_list )[ where ] = 0; + +/* Note if the Mapping sequence was modified. */ + result = where; + } + +/* If UnitMaps can be merged, create the replacement UnitMap. */ + } else { + new = (AstMapping *) astUnitMap( nin, "", status ); + if ( astOK ) { + +/* Annul the pointers to all the UnitMaps that are being replaced. */ + for ( i = i1; i <= i2; i++ ) { + ( *map_list )[ i ] = astAnnul( ( *map_list )[ i ] ); + } + +/* Insert the new pointer and the associated Invert flag. */ + ( *map_list )[ i1 ] = new; + ( *invert_list )[ i1 ] = 0; + +/* Loop to close the resulting gap by moving subsequent elements down + in the arrays. */ + for ( i = i2 + 1; i < *nmap; i++ ) { + ( *map_list )[ i - ngone ] = ( *map_list )[ i ]; + ( *invert_list )[ i - ngone ] = ( *invert_list )[ i ]; + } + +/* Clear the vacated elements at the end. */ + for ( i = *nmap - ngone; i < *nmap; i++ ) { + ( *map_list )[ i ] = NULL; + ( *invert_list )[ i ] = 0; + } + +/* Decrement the Mapping count and return the index of the first + modified element. */ + ( *nmap ) -= ngone; + result = i1; + } + } + } + } + } + +/* 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 +* UnitMap. + +* Type: +* Private function. + +* Synopsis: +* #include "unitmap.h" +* int *MapSplit( AstMapping *this, int nin, const int *in, AstMapping **map, int *status ) + +* Class Membership: +* UnitMap 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 UnitMap. This is only possible if the specified inputs +* correspond to some subset of the UnitMap outputs. That is, there +* must exist a subset of the UnitMap outputs for which each output +* depends only on the selected UnitMap inputs, and not on any of the +* inputs which have not been selected. If this condition is not met +* by the supplied UnitMap, then a NULL Mapping is returned. + +* Parameters: +* this +* Pointer to the UnitMap to be split (the UnitMap 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 UnitMap, 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 UnitMap 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 UnitMap. 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: */ + AstUnitMap *this; /* Pointer to UnitMap structure */ + int *result; /* Pointer to returned array */ + int i; /* Loop count */ + int iin; /* Mapping input index */ + int mnin; /* No. of Mapping inputs */ + int ok; /* Are input indices OK? */ + +/* Initialise */ + result = NULL; + *map = NULL; + +/* Check the global error status. */ + if ( !astOK ) return result; + +/* Get a pointer to the UnitMap structure. */ + this = (AstUnitMap *) this_map; + +/* Allocate memory for the returned array and create a UnitMap with the + required number of axes. */ + result = astMalloc( sizeof( int )*(size_t) nin ); + *map = (AstMapping *) astUnitMap( nin, "", status ); + +/* Check pointers can be used safely. */ + if( astOK ) { + +/* Store the required output axis indices. At the same time check that each + axis is valid. */ + mnin = astGetNin( this ); + ok = 1; + for( i = 0; i < nin; i++ ) { + iin = in[ i ]; + if( iin >= 0 && iin < mnin ) { + result[ i ] = iin; + } else { + ok = 0; + break; + } + } + +/* If the "in" array contained any invalid values, free the returned + resources. */ + if( !ok ) { + result = astFree( result ); + *map = astAnnul( *map ); + } + } + +/* Free returned resources if an error has occurred. */ + if( !astOK ) { + result = astFree( result ); + *map = astAnnul( *map ); + } + +/* Return the list of output indices. */ + return result; +} + +static double Rate( AstMapping *this, double *at, int ax1, int ax2, int *status ){ +/* +* Name: +* Rate + +* Purpose: +* Calculate the rate of change of a Mapping output. + +* Type: +* Private function. + +* Synopsis: +* #include "unitmap.h" +* result = Rate( AstMapping *this, double *at, int ax1, int ax2, int *status ) + +* Class Membership: +* UnitMap 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 AstPointSet *Transform( AstMapping *this, AstPointSet *in, + int forward, AstPointSet *out, int *status ) { +/* +* Name: +* Transform + +* Purpose: +* Apply a UnitMap to transform a set of points. + +* Type: +* Private function. + +* Synopsis: +* #include "unitmap.h" +* AstPointSet *Transform( AstMapping *this, AstPointSet *in, +* int forward, AstPointSet *out, int *status ) + +* Class Membership: +* UnitMap member function (over-rides the astTransform method inherited +* from the Mapping class). + +* Description: +* This function takes a UnitMap and a set of points encapsulated in a +* PointSet and transforms the points so as to perform the identity +* transformation (i.e. simply copies the coordinate values). + +* Parameters: +* this +* Pointer to the UnitMap. +* 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. In this case, both transformations are equivalent. +* 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 UnitMap 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 */ + AstUnitMap *map; /* Pointer to UnitMap to be applied */ + double **ptr_in; /* Pointer to input coordinate data */ + double **ptr_out; /* Pointer to output coordinate data */ + int coord; /* Loop counter for coordinates */ + int ncoord_in; /* Number of coordinates per input point */ + int npoint; /* Number of points */ + +/* Check the global error status. */ + if ( !astOK ) return NULL; + +/* Obtain a pointer to the UnitMap. */ + map = (AstUnitMap *) 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 + coordinate copy 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 ); + +/* We need not determine whether to apply the forward or inverse + transformation, as they are both the same. */ + +/* Copy the coordinate values. */ +/* --------------------------- */ + if ( astOK ) { + +/* Loop to copy the values for each coordinate. Use a memory copy for speed. + Do not do the copy if the input and output arrays are the same. */ + for ( coord = 0; coord < ncoord_in; coord++ ) { + if( ptr_out[ coord ] != ptr_in[ coord ] ) { + (void) memcpy( (void *) ptr_out[ coord ], + (const void *) ptr_in[ coord ], + sizeof( double ) * (size_t) npoint ); + } + } + } + +/* Return a pointer to the output PointSet. */ + return result; +} + +/* Copy constructor. */ +/* ----------------- */ +/* No copy constructor is needed, as a byte-by-byte copy suffices. */ + +/* Destructor. */ +/* ----------- */ +/* No destructor is needed as no memory, etc. needs freeing. */ + +/* Dump function. */ +/* -------------- */ +static void Dump( AstObject *this_object, AstChannel *channel, int *status ) { +/* +* Name: +* Dump + +* Purpose: +* Dump function for UnitMap 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 UnitMap class to an output Channel. + +* Parameters: +* this +* Pointer to the UnitMap 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: */ + AstUnitMap *this; /* Pointer to the UnitMap structure */ + +/* Check the global error status. */ + if ( !astOK ) return; + +/* Obtain a pointer to the UnitMap structure. */ + this = (AstUnitMap *) this_object; + +/* Write out values representing the instance variables for the + UnitMap class. Accompany these with appropriate comment strings, + possibly depending on the values being written.*/ + +/* In the case of attributes, we first use the appropriate (private) + Test... member function to see if they are set. If so, we then use + the (private) Get... function to obtain the value to be written + out. + + For attributes which are not set, we use the astGet... method to + obtain the value instead. This will supply a default value + (possibly provided by a derived class which over-rides this method) + which is more useful to a human reader as it corresponds to the + actual default attribute value. Since "set" will be zero, these + values are for information only and will not be read back. */ + +/* There are no values to write, so return without further action. */ +} + +/* Standard class functions. */ +/* ========================= */ +/* Implement the astIsAUnitMap and astCheckUnitMap functions using the macros + defined for this purpose in the "object.h" header file. */ +astMAKE_ISA(UnitMap,Mapping) +astMAKE_CHECK(UnitMap) + +AstUnitMap *astUnitMap_( int ncoord, const char *options, int *status, ...) { +/* +*++ +* Name: +c astUnitMap +f AST_UNITMAP + +* Purpose: +* Create a UnitMap. + +* Type: +* Public function. + +* Synopsis: +c #include "unitmap.h" +c AstUnitMap *astUnitMap( int ncoord, const char *options, ... ) +f RESULT = AST_UNITMAP( NCOORD, OPTIONS, STATUS ) + +* Class Membership: +* UnitMap constructor. + +* Description: +* This function creates a new UnitMap and optionally initialises +* its attributes. +* +* A UnitMap is a unit (null) Mapping that has no effect on the +* coordinates supplied to it. They are simply copied. This can be +* useful if a Mapping is required (e.g. to pass to another +c function) but you do not want it to have any effect. +f routine) but you do not want it to have any effect. + +* Parameters: +c ncoord +f NCOORD = INTEGER (Given) +* The number of input and output coordinates (these numbers are +* necessarily the same). +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 UnitMap. 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 UnitMap. 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 astUnitMap() +f AST_UNITMAP = INTEGER +* A pointer to the new UnitMap. + +* Notes: +* - A null Object pointer (AST__NULL) will be returned if this +c function is invoked with the AST error status set, or if it +f function is invoked with STATUS set to an error value, or if it +* should fail for any reason. +*-- +*/ + +/* Local Variables: */ + astDECLARE_GLOBALS /* Pointer to thread-specific global data */ + AstUnitMap *new; /* Pointer to new UnitMap */ + va_list args; /* Variable argument list */ + +/* Get a pointer to the thread specific global data structure. */ + astGET_GLOBALS(NULL); + +/* Check the global status. */ + if ( !astOK ) return NULL; + +/* Initialise the UnitMap, allocating memory and initialising the + virtual function table as well if necessary. */ + new = astInitUnitMap( NULL, sizeof( AstUnitMap ), !class_init, &class_vtab, + "UnitMap", ncoord ); + +/* 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 + UnitMap'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 UnitMap. */ + return new; +} + +AstUnitMap *astUnitMapId_( int ncoord, const char *options, ... ) { +/* +* Name: +* astUnitMapId_ + +* Purpose: +* Create a UnitMap. + +* Type: +* Private function. + +* Synopsis: +* #include "unitmap.h" +* AstUnitMap *astUnitMapId_( int ncoord, const char *options, ... ) + +* Class Membership: +* UnitMap constructor. + +* Description: +* This function implements the external (public) interface to the +* astUnitMap constructor function. It returns an ID value (instead +* of a true C pointer) to external users, and must be provided +* because astUnitMap_ 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 astUnitMap_ 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 astUnitMap_. + +* Returned Value: +* The ID value associated with the new UnitMap. +*/ + +/* Local Variables: */ + astDECLARE_GLOBALS /* Pointer to thread-specific global data */ + AstUnitMap *new; /* Pointer to new UnitMap */ + va_list args; /* Variable argument list */ + + int *status; /* Pointer to inherited status value */ + +/* Get a pointer to the inherited status value. */ + status = astGetStatusPtr; + +/* Get a pointer to the thread specific global data structure. */ + astGET_GLOBALS(NULL); + +/* Check the global status. */ + if ( !astOK ) return NULL; + +/* Initialise the UnitMap, allocating memory and initialising the + virtual function table as well if necessary. */ + new = astInitUnitMap( NULL, sizeof( AstUnitMap ), !class_init, &class_vtab, + "UnitMap", ncoord ); + +/* 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 + UnitMap'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 UnitMap. */ + return astMakeId( new ); +} + +AstUnitMap *astInitUnitMap_( void *mem, size_t size, int init, + AstUnitMapVtab *vtab, const char *name, + int ncoord, int *status ) { +/* +*+ +* Name: +* astInitUnitMap + +* Purpose: +* Initialise a UnitMap. + +* Type: +* Protected function. + +* Synopsis: +* #include "unitmap.h" +* AstUnitMap *astInitUnitMap( void *mem, size_t size, int init, +* AstUnitMapVtab *vtab, const char *name, +* int ncoord ) + +* Class Membership: +* UnitMap initialiser. + +* Description: +* This function is provided for use by class implementations to initialise +* a new UnitMap object. It allocates memory (if necessary) to accommodate +* the UnitMap plus any additional data associated with the derived class. +* It then initialises a UnitMap 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 UnitMap at the start of the memory passed via the +* "vtab" parameter. + +* Parameters: +* mem +* A pointer to the memory in which the UnitMap is to be initialised. +* This must be of sufficient size to accommodate the UnitMap data +* (sizeof(UnitMap)) 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 UnitMap (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 UnitMap +* structure, so a valid value must be supplied even if not required for +* allocating memory. +* init +* A logical flag indicating if the UnitMap'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 UnitMap. +* 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 Object +* astClass function). +* ncoord +* The number of coordinate values per point. + +* Returned Value: +* A pointer to the new UnitMap. + +* 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: */ + AstUnitMap *new; /* Pointer to new UnitMap */ + +/* Check the global status. */ + if ( !astOK ) return NULL; + +/* If necessary, initialise the virtual function table. */ + if ( init ) astInitUnitMapVtab( vtab, name ); + +/* Initialise. */ + new = NULL; + +/* Initialise a Mapping structure (the parent class) as the first component + within the UnitMap structure, allocating memory if necessary. Specify that + the Mapping should be defined in both the forward and inverse directions. */ + new = (AstUnitMap *) astInitMapping( mem, size, 0, + (AstMappingVtab *) vtab, name, + ncoord, ncoord, 1, 1 ); + + if ( astOK ) { + +/* Initialise the UnitMap data. */ +/* ---------------------------- */ +/* There is nothing else to store. */ + +/* If an error occurred, clean up by deleting the new object (if any other + resources had been allocated, we would free these first). */ + if ( !astOK ) new = astDelete( new ); + } + +/* Return a pointer to the new object. */ + return new; +} + +AstUnitMap *astLoadUnitMap_( void *mem, size_t size, + AstUnitMapVtab *vtab, const char *name, + AstChannel *channel, int *status ) { +/* +*+ +* Name: +* astLoadUnitMap + +* Purpose: +* Load a UnitMap. + +* Type: +* Protected function. + +* Synopsis: +* #include "unitmap.h" +* AstUnitMap *astLoadUnitMap( void *mem, size_t size, +* AstUnitMapVtab *vtab, const char *name, +* AstChannel *channel ) + +* Class Membership: +* UnitMap loader. + +* Description: +* This function is provided to load a new UnitMap 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 +* UnitMap 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 UnitMap at the start of the memory +* passed via the "vtab" parameter. + + +* Parameters: +* mem +* A pointer to the memory into which the UnitMap is to be +* loaded. This must be of sufficient size to accommodate the +* UnitMap data (sizeof(UnitMap)) 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 UnitMap (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 UnitMap 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(AstUnitMap) is used instead. +* vtab +* Pointer to the start of the virtual function table to be +* associated with the new UnitMap. If this is NULL, a pointer +* to the (static) virtual function table for the UnitMap 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 "UnitMap" is used instead. + +* Returned Value: +* A pointer to the new UnitMap. + +* 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 */ + AstUnitMap *new; /* Pointer to the new UnitMap */ + +/* 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 UnitMap. In this case the + UnitMap belongs to this class, so supply appropriate values to be + passed to the parent class loader (and its parent, etc.). */ + if ( !vtab ) { + size = sizeof( AstUnitMap ); + vtab = &class_vtab; + name = "UnitMap"; + +/* If required, initialise the virtual function table for this class. */ + if ( !class_init ) { + astInitUnitMapVtab( 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 UnitMap. */ + 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, "UnitMap" ); + +/* 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. */ + +/* There are no values to read. */ +/* ---------------------------- */ + +/* If an error occurred, clean up by deleting the new UnitMap. */ + if ( !astOK ) new = astDelete( new ); + } + +/* Return the new UnitMap 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. */ + +/* There are none of these. */ + + + + |