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Diffstat (limited to 'ast/sphmap.c')
-rw-r--r-- | ast/sphmap.c | 2052 |
1 files changed, 0 insertions, 2052 deletions
diff --git a/ast/sphmap.c b/ast/sphmap.c deleted file mode 100644 index b73cf7a..0000000 --- a/ast/sphmap.c +++ /dev/null @@ -1,2052 +0,0 @@ -/* -*class++ -* Name: -* SphMap - -* Purpose: -* Map 3-d Cartesian to 2-d spherical coordinates - -* Constructor Function: -c astSphMap -f AST_SPHMAP - -* Description: -* A SphMap is a Mapping which transforms points from a -* 3-dimensional Cartesian coordinate system into a 2-dimensional -* spherical coordinate system (longitude and latitude on a unit -* sphere centred at the origin). It works by regarding the input -* coordinates as position vectors and finding their intersection -* with the sphere surface. The inverse transformation always -* produces points which are a unit distance from the origin -* (i.e. unit vectors). - -* Inheritance: -* The SphMap class inherits from the Mapping class. - -* Attributes: -* In addition to those attributes common to all Mappings, every -* SphMap also has the following attributes: -* -* - UnitRadius: SphMap input vectors lie on a unit sphere? -* - PolarLong: The longitude value to assign to either pole - -* Functions: -c The SphMap class does not define any new functions beyond those -f The SphMap class does not define any new routines beyond those -* which are applicable to all Mappings. - -* Copyright: -* Copyright (C) 1997-2006 Council for the Central Laboratory of the -* Research Councils - -* Licence: -* This program is free software: you can redistribute it and/or -* modify it under the terms of the GNU Lesser General Public -* License as published by the Free Software Foundation, either -* version 3 of the License, or (at your option) any later -* version. -* -* This program is distributed in the hope that it will be useful, -* but WITHOUT ANY WARRANTY; without even the implied warranty of -* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -* GNU Lesser General Public License for more details. -* -* You should have received a copy of the GNU Lesser General -* License along with this program. If not, see -* <http://www.gnu.org/licenses/>. - -* Authors: -* DSB: David Berry (Starlink) -* RFWS: R.F. Warren-Smith (Starlink) - -* History: -* 24-OCT-1996 (DSB): -* Original version. -* 5-MAR-1997 (RFWS): -* Tidied public prologues. -* 24-MAR-1998 (RFWS): -* Override the astMapMerge method. -* 4-SEP-1998 (DSB): -* Added UnitRadius attribute. -* 8-JAN-2003 (DSB): -* Changed private InitVtab method to protected astInitSphMapVtab -* method. -* 11-JUN-2003 (DSB): -* Added PolarLong attribute. -* 10-MAY-2006 (DSB): -* Override astEqual. -* 5-NOV-2013 (DSB): -* Modify MapMerge so that it can spot and simplify an -* (inverted SphMap,MatrixMap,SphMap) sequence in which the -* MatrixMap just magnifies or reflects the radius vector. -* 25-MAR-2014 (DSB): -* Correct 5-NOV-2013 MapMerge change. -*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 SphMap - -/* 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 "globals.h" /* Thread-safe global data access */ -#include "object.h" /* Base Object class */ -#include "pointset.h" /* Sets of points/coordinates */ -#include "mapping.h" /* Coordinate mappings (parent class) */ -#include "channel.h" /* I/O channels */ -#include "unitmap.h" /* Unit (identity) Mappings */ -#include "sphmap.h" /* Interface definition for this class */ -#include "pal.h" /* SLA transformations */ -#include "wcsmap.h" /* For the AST__DPIBY2 (etc) constants */ -#include "matrixmap.h" /* Matrix mappings */ -#include "winmap.h" /* Shift and scale mappings */ -#include "zoommap.h" /* Scale mappings */ - -/* Error code definitions. */ -/* ----------------------- */ -#include "ast_err.h" /* AST error codes */ - -/* C header files. */ -/* --------------- */ -#include <float.h> -#include <stdarg.h> -#include <stddef.h> -#include <stdio.h> -#include <string.h> - -/* Module Variables. */ -/* ================= */ - -/* Address of this static variable is used as a unique identifier for - member of this class. */ -static int class_check; - -/* Pointers to parent class methods which are extended by this class. */ -static AstPointSet *(* parent_transform)( AstMapping *, AstPointSet *, int, AstPointSet *, int * ); -static const char *(* parent_getattrib)( AstObject *, const char *, int * ); -static int (* parent_testattrib)( AstObject *, const char *, int * ); -static void (* parent_clearattrib)( AstObject *, const char *, int * ); -static void (* parent_setattrib)( AstObject *, const char *, int * ); - -/* Define macros for accessing each item of thread specific global data. */ -#ifdef THREAD_SAFE - -/* Define how to initialise thread-specific globals. */ -#define GLOBAL_inits \ - globals->Class_Init = 0; \ - globals->GetAttrib_Buff[ 0 ] = 0; - -/* Create the function that initialises global data for this module. */ -astMAKE_INITGLOBALS(SphMap) - -/* Define macros for accessing each item of thread specific global data. */ -#define class_init astGLOBAL(SphMap,Class_Init) -#define class_vtab astGLOBAL(SphMap,Class_Vtab) -#define getattrib_buff astGLOBAL(SphMap,GetAttrib_Buff) - - - -/* If thread safety is not needed, declare and initialise globals at static - variables. */ -#else - -static char getattrib_buff[ 101 ]; - - -/* Define the class virtual function table and its initialisation flag - as static variables. */ -static AstSphMapVtab 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. */ -AstSphMap *astSphMapId_( const char *, ...); - -/* Prototypes for Private Member Functions. */ -/* ======================================== */ -static int GetUnitRadius( AstSphMap *, int * ); -static int TestUnitRadius( AstSphMap *, int * ); -static void ClearUnitRadius( AstSphMap *, int * ); -static void SetUnitRadius( AstSphMap *, int, int * ); - -static double GetPolarLong( AstSphMap *, int * ); -static int TestPolarLong( AstSphMap *, int * ); -static void ClearPolarLong( AstSphMap *, int * ); -static void SetPolarLong( AstSphMap *, double, int * ); - -static AstPointSet *Transform( AstMapping *, AstPointSet *, int, AstPointSet *, int * ); -static const char *GetAttrib( AstObject *, const char *, int * ); -static int Equal( AstObject *, AstObject *, int * ); -static int MapMerge( AstMapping *, int, int, int *, AstMapping ***, int **, int * ); -static int TestAttrib( AstObject *, const char *, int * ); -static void ClearAttrib( AstObject *, const char *, int * ); -static void Copy( const AstObject *, AstObject *, int * ); -static void Delete( AstObject *, int * ); -static void Dump( AstObject *, AstChannel *, int * ); -static void SetAttrib( AstObject *, const char *, int * ); - -/* Member functions. */ -/* ================= */ -static void ClearAttrib( AstObject *this_object, const char *attrib, int *status ) { -/* -* Name: -* ClearAttrib - -* Purpose: -* Clear an attribute value for a SphMap. - -* Type: -* Private function. - -* Synopsis: -* #include "sphmap.h" -* void ClearAttrib( AstObject *this, const char *attrib, int *status, int *status ) - -* Class Membership: -* SphMap member function (over-rides the astClearAttrib protected -* method inherited from the Mapping class). - -* Description: -* This function clears the value of a specified attribute for a -* SphMap, so that the default value will subsequently be used. - -* Parameters: -* this -* Pointer to the SphMap. -* attrib -* Pointer to a null-terminated string specifying the attribute -* name. This should be in lower case with no surrounding white -* space. -* status -* Pointer to the inherited status variable. -* status -* Pointer to the inherited status variable. -*/ - -/* Local Variables: */ - AstSphMap *this; /* Pointer to the SphMap structure */ - -/* Check the global error status. */ - if ( !astOK ) return; - -/* Obtain a pointer to the SphMap structure. */ - this = (AstSphMap *) this_object; - -/* UnitRadius */ -/* ---------- */ - if ( !strcmp( attrib, "unitradius" ) ) { - astClearUnitRadius( this ); - -/* PolarLong */ -/* --------- */ - } else if ( !strcmp( attrib, "polarlong" ) ) { - astClearPolarLong( this ); - -/* If the attribute is still not recognised, pass it on to the parent - method for further interpretation. */ - } else { - (*parent_clearattrib)( this_object, attrib, status ); - } -} - -static int Equal( AstObject *this_object, AstObject *that_object, int *status ) { -/* -* Name: -* Equal - -* Purpose: -* Test if two SphMaps are equivalent. - -* Type: -* Private function. - -* Synopsis: -* #include "sphmap.h" -* int Equal( AstObject *this, AstObject *that, int *status, int *status ) - -* Class Membership: -* SphMap 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 SphMaps are equivalent. - -* Parameters: -* this -* Pointer to the first Object (a SphMap). -* that -* Pointer to the second Object. -* status -* Pointer to the inherited status variable. -* status -* Pointer to the inherited status variable. - -* Returned Value: -* One if the SphMaps 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: */ - AstSphMap *that; - AstSphMap *this; - int nin; - int nout; - int result; - -/* Initialise. */ - result = 0; - -/* Check the global error status. */ - if ( !astOK ) return result; - -/* Obtain pointers to the two SphMap structures. */ - this = (AstSphMap *) this_object; - that = (AstSphMap *) that_object; - -/* Check the second object is a SphMap. We know the first is a - SphMap since we have arrived at this implementation of the virtual - function. */ - if( astIsASphMap( that ) ) { - -/* Get the number of inputs and outputs and check they are the same for both. */ - nin = astGetNin( this ); - nout = astGetNout( this ); - if( astGetNin( that ) == nin && astGetNout( that ) == nout ) { - -/* If the Invert flags for the two SphMaps differ, it may still be possible - for them to be equivalent. First compare the SphMaps if their Invert - flags are the same. In this case all the attributes of the two SphMaps - must be identical. */ - if( astGetInvert( this ) == astGetInvert( that ) ) { - - if( astEQUAL( this->polarlong, that->polarlong ) && - this->unitradius == that->unitradius ){ - result = 1; - } - -/* If the Invert flags for the two SphMaps differ, the attributes of the two - SphMaps must be inversely related to each other. */ - } else { - -/* In the specific case of a SphMap, Invert flags must be equal. */ - result = 0; - - } - } - } - -/* If an error occurred, clear the result value. */ - if ( !astOK ) result = 0; - -/* Return the result, */ - return result; -} - -static const char *GetAttrib( AstObject *this_object, const char *attrib, int *status ) { -/* -* Name: -* GetAttrib - -* Purpose: -* Get the value of a specified attribute for a SphMap. - -* Type: -* Private function. - -* Synopsis: -* #include "sphmap.h" -* const char *GetAttrib( AstObject *this, const char *attrib, int *status, int *status ) - -* Class Membership: -* SphMap member function (over-rides the protected astGetAttrib -* method inherited from the Mapping class). - -* Description: -* This function returns a pointer to the value of a specified -* attribute for a SphMap, formatted as a character string. - -* Parameters: -* this -* Pointer to the SphMap. -* attrib -* Pointer to a null-terminated string containing the name of -* the attribute whose value is required. This name should be in -* lower case, with all white space removed. -* status -* Pointer to the inherited status variable. -* status -* Pointer to the inherited status variable. - -* Returned Value: -* - Pointer to a null-terminated string containing the attribute -* value. - -* Notes: -* - The returned string pointer may point at memory allocated -* within the SphMap, or at static memory. The contents of the -* string may be over-written or the pointer may become invalid -* following a further invocation of the same function or any -* modification of the SphMap. A copy of the string should -* therefore be made if necessary. -* - A NULL pointer will be returned if this function is invoked -* with the global error status set, or if it should fail for any -* reason. -*/ - -/* Local Variables: */ - astDECLARE_GLOBALS /* Pointer to thread-specific global data */ - AstSphMap *this; /* Pointer to the SphMap structure */ - const char *result; /* Pointer value to return */ - double dval; /* Double precision attribute value */ - int ival; /* Int attribute value */ - -/* Initialise. */ - result = NULL; - -/* Check the global error status. */ - if ( !astOK ) return result; - -/* Get a pointer to the thread specific global data structure. */ - astGET_GLOBALS(this_object); - -/* Obtain a pointer to the SphMap structure. */ - this = (AstSphMap *) this_object; - -/* UnitRadius. */ -/* ----------- */ - if ( !strcmp( attrib, "unitradius" ) ) { - ival = astGetUnitRadius( this ); - if ( astOK ) { - (void) sprintf( getattrib_buff, "%d", ival ); - result = getattrib_buff; - } - -/* PolarLong */ -/* --------- */ - } else if ( !strcmp( attrib, "polarlong" ) ) { - dval = astGetPolarLong( this ); - if ( astOK ) { - (void) sprintf( getattrib_buff, "%.*g", DBL_DIG, dval ); - result = getattrib_buff; - } - -/* If the attribute name was not recognised, pass it on to the parent - method for further interpretation. */ - } else { - result = (*parent_getattrib)( this_object, attrib, status ); - } - -/* Return the result. */ - return result; -} - -void astInitSphMapVtab_( AstSphMapVtab *vtab, const char *name, int *status ) { -/* -*+ -* Name: -* astInitSphMapVtab - -* Purpose: -* Initialise a virtual function table for a SphMap. - -* Type: -* Protected function. - -* Synopsis: -* #include "sphmap.h" -* void astInitSphMapVtab( AstSphMapVtab *vtab, const char *name ) - -* Class Membership: -* SphMap vtab initialiser. - -* Description: -* This function initialises the component of a virtual function -* table which is used by the SphMap 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 astIsASphMap) to determine if an object belongs - to this class. We can conveniently use the address of the (static) - class_check variable to generate this unique value. */ - vtab->id.check = &class_check; - vtab->id.parent = &(((AstMappingVtab *) vtab)->id); - -/* Initialise member function pointers. */ -/* ------------------------------------ */ -/* Store pointers to the member functions (implemented here) that provide - virtual methods for this class. */ - vtab->ClearUnitRadius = ClearUnitRadius; - vtab->SetUnitRadius = SetUnitRadius; - vtab->GetUnitRadius = GetUnitRadius; - vtab->TestUnitRadius = TestUnitRadius; - - vtab->ClearPolarLong = ClearPolarLong; - vtab->SetPolarLong = SetPolarLong; - vtab->GetPolarLong = GetPolarLong; - vtab->TestPolarLong = TestPolarLong; - -/* Save the inherited pointers to methods that will be extended, and - replace them with pointers to the new member functions. */ - object = (AstObjectVtab *) vtab; - mapping = (AstMappingVtab *) vtab; - - parent_clearattrib = object->ClearAttrib; - object->ClearAttrib = ClearAttrib; - parent_getattrib = object->GetAttrib; - object->GetAttrib = GetAttrib; - parent_setattrib = object->SetAttrib; - object->SetAttrib = SetAttrib; - parent_testattrib = object->TestAttrib; - object->TestAttrib = TestAttrib; - - parent_transform = mapping->Transform; - mapping->Transform = Transform; - -/* Store replacement pointers for methods which will be over-ridden by - new member functions implemented here. */ - object->Equal = Equal; - mapping->MapMerge = MapMerge; - -/* Declare the class dump, copy and delete functions.*/ - astSetDump( vtab, Dump, "SphMap", "Cartesian to Spherical mapping" ); - 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 SphMap. - -* Type: -* Private function. - -* Synopsis: -* #include "sphmap.h" -* int MapMerge( AstMapping *this, int where, int series, int *nmap, -* AstMapping ***map_list, int **invert_list, int *status, int *status ) - -* Class Membership: -* SphMap 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 SphMap 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 SphMap 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 SphMap which is to be merged with -* its neighbours. This should be a cloned copy of the SphMap -* pointer contained in the array element "(*map_list)[where]" -* (see below). This pointer will not be annulled, and the -* SphMap it identifies will not be modified by this function. -* where -* Index in the "*map_list" array (below) at which the pointer -* to the nominated SphMap 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. -* 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 Mapping */ - AstMatrixMap *mm; /* Pointer to MatrixMap */ - AstWinMap *wm; /* The new WinMap */ - const char *class; /* Pointer to Mapping class string */ - double absval; /* Absolute value fo each diagonal element */ - double diag[ 3 ]; /* The diagonal matrix elements */ - double polarlong; /* Value of PolarLong attribute */ - int imap1; /* Index of first SphMap */ - int imap2; /* Index of second SphMap */ - int imap; /* Loop counter for Mappings */ - int result; /* Result value to return */ - int simpler; /* Mappings simplified? */ - -/* Initialise the returned result. */ - result = -1; - -/* Check the global error status. */ - if ( !astOK ) return result; - -/* Further initialisation. */ - new = NULL; - simpler = 0; - -/* We will only handle the case of SphMaps in series and will consider - merging the nominated SphMap with the Mapping which follows - it. Check that there is such a Mapping. */ - if ( series && ( ( where + 1 ) < *nmap ) ) { - -/* Obtain the indices of the two potential SphMaps to be merged. */ - imap1 = where; - imap2 = where + 1; - -/* Obtain the Class string of the second Mapping and determine if it - is a SphMap. */ - class = astGetClass( ( *map_list )[ imap2 ] ); - if ( astOK && !strcmp( class, "SphMap" ) ) { - -/* Check if the first SphMap is applied in the inverse direction and - the second in the forward direction. This combination can be - simplified if the PolarLongitude attributes are equal.. */ - if( ( *invert_list )[ imap1 ] && !( *invert_list )[ imap2 ] ) { - simpler = astEQUAL( astGetPolarLong( ( *map_list )[ imap1 ] ), - astGetPolarLong( ( *map_list )[ imap2 ] ) ); - -/* If the first SphMap is applied in the forward direction and the second in - the inverse direction, the combination can only be simplified if the - input vectors to the first SphMap all have unit length (as indicated by - the UnitRadius attribute). */ - } else if( !( *invert_list )[ imap1 ] && ( *invert_list )[ imap2 ] ) { - simpler = astGetUnitRadius( ( *map_list )[ imap1 ] ); - } - } - -/* If the two SphMaps can be simplified, create a UnitMap to replace - them. */ - if ( simpler ) { - new = (AstMapping *) astUnitMap( 2, "", status ); - -/* Annul the pointers to the SphMaps. */ - if ( astOK ) { - ( *map_list )[ imap1 ] = astAnnul( ( *map_list )[ imap1 ] ); - ( *map_list )[ imap2 ] = astAnnul( ( *map_list )[ imap2 ] ); - -/* Insert the pointer to the replacement Mapping and initialise its - invert flag. */ - ( *map_list )[ imap1 ] = new; - ( *invert_list )[ imap1 ] = 0; - -/* Loop to close the resulting gap by moving subsequent elements down - in the arrays. */ - for ( imap = imap2 + 1; imap < *nmap; imap++ ) { - ( *map_list )[ imap - 1 ] = ( *map_list )[ imap ]; - ( *invert_list )[ imap - 1 ] = ( *invert_list )[ imap ]; - } - -/* Clear the vacated elements 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 = imap1; - } - } - } - -/* Another possible simplification is if the nominated Mapping is an inverted - SphMap followed in series by a ZoomMap or diagonal MatrixMap that has - diagonal elements of equal magnitude, which is then followed by a - non-inverted SphMap. This is equivalent to a 3D rotation of a pair of - (longitude,latitude) angles. The MatrixMap/ZoomMap may magnify the - radius vector, but this will not alter the angles. Any difference in - signs amongst the diagonal elements will cause a reflection or reversal - of the corresponbding angles, which can be represented by a WinMap. We - do not need to consider the other possibility (that the nominated - SphMap is the *last* Mapping in such a sequence of three), since we - will already have discovered such a sequence on an earlier invocation - of this function. */ - if( series && !simpler && ( *invert_list )[ where ] && - where + 2 < *nmap ) { - -/* Check the third Mapping is a non-inverted SphMap. */ - class = astGetClass( ( *map_list )[ where + 2 ] ); - if( astOK && !strcmp( class, "SphMap" ) && - !( *invert_list )[ where + 2 ] ) { - -/* Check the second Mapping is a ZoomMap, or a diagonal MatrixMap that - has diagonal elements of equal magnitude. Since the Mapping is - sandwiched between the two SphMaps, we know it must have 3 inputs and - 3 outputs. Record the corresponding diagonal values. The state of the - Invert flag does not matter since it will only affect the degree to - which the radius vector is magnified - it will not change the signs of - any diagonal elements. */ - class = astGetClass( ( *map_list )[ where + 1 ] ); - if( astOK && !strcmp( class, "ZoomMap" ) ) { - diag[ 0 ] = astGetZoom( ( *map_list )[ where + 1 ] ); - if( diag[ 0 ] != 0.0 ) { - diag[ 1 ] = diag[ 0 ]; - diag[ 2 ] = diag[ 0 ]; - } else { - class = NULL; - } - - } else if( astOK && !strcmp( class, "MatrixMap" ) ) { - mm = (AstMatrixMap *) ( *map_list )[ where + 1 ]; - if( mm->form == 1 && mm->f_matrix ) { - diag[ 0 ] = mm->f_matrix[ 0 ]; - if( diag[ 0 ] != 0.0 ) { - diag[ 1 ] = mm->f_matrix[ 1 ]; - diag[ 2 ] = mm->f_matrix[ 2 ]; - - absval = fabs( diag[ 0 ] ); - if( !astEQUAL( fabs( diag[ 1 ] ), absval ) || - !astEQUAL( fabs( diag[ 2 ] ), absval ) ) { - class = NULL; - } - - } else { - class = NULL; - } - - } else { - class = NULL; - } - - } else { - class = NULL; - } - - } else { - class = NULL; - } - -/* We can only make changes if above conditions were met. */ - if( class ) { - -/* Create a WinMap that modifies the (longitude,latitude) values, initially - with undefined corners. */ - wm = astWinMap( 2, NULL, NULL, NULL, NULL, "", status ); - -/* Store appropriate scales and offsets in the WinMap. These just depend on - the signs of the matrix diagonal elements since we know the magnitudes of - these elements are all equal. */ - if( diag[ 0 ] < 0.0 ) { - if( diag[ 1 ] < 0.0 ) { - wm->a[ 0 ] = AST__DPI; - wm->b[ 0 ] = 1.0; - } else { - wm->a[ 0 ] = AST__DPI; - wm->b[ 0 ] = -1.0; - } - - } else { - if( diag[ 1 ] < 0.0 ) { - wm->a[ 0 ] = 0.0; - wm->b[ 0 ] = -1.0; - } else { - wm->a[ 0 ] = 0.0; - wm->b[ 0 ] = 1.0; - } - } - - if( diag[ 2 ] < 0.0 ) { - wm->a[ 1 ] = 0.0; - wm->b[ 1 ] = -1.0; - } else { - wm->a[ 1 ] = 0.0; - wm->b[ 1 ] = 1.0; - } - -/* We are aiming to replace the supplied (SphMap,MatrixMap,SphMap) - combination with (WinMap,SphMap,SphMap), leaving us with an inverted - and non-inverted SphMap side by side. This is on the understanding - that a subsequent call to this function will combine these two - adjacent SphMaps into a UnitMap. But this will only happen if the - adjacent SphMaps have equal values for their PolarLong attributes. The - change of (SphMap,MatrixMap) to (WinMap,SphMap) will change the value - of the PolarLong attribute in the first SphMap, so we need to work out - this changed value and check that it is the same as the PolarLong - value of the second SphMap. If they are different, there is no point - making any changes since the two SphMaps cannot be merged into a - UnitMap. So get the PolarLong value from the supplied first SphMap. */ - polarlong = astGetPolarLong( ( *map_list )[ where ] ); - -/* Modified the PolarLong value to take account of the change from - (SphMap,MatrixMap) to (WinMap,SphMap). */ - polarlong = wm->a[ 0 ] + wm->b[ 0 ]*polarlong; - -/* Check this is the same as the PolarLong value in the second SphMap. */ - if( astEQUAL( polarlong, astGetPolarLong( ( *map_list )[ where + 2 ] ) ) ) { - -/* All is good, so we can now change the supplied Mappings list. First - change the PolarLong value in the first SphMap. */ - astSetPolarLong( ( *map_list )[ where ], polarlong ); - -/* Annul The MatrixMap or ZoomMap. */ - (void) astAnnul( ( *map_list )[ where + 1 ] ); - -/* Move the first SphMap to the slot left vacant by the annulled - MatrixMap or ZoomMap. */ - ( *map_list )[ where + 1 ] = ( *map_list )[ where ]; - ( *invert_list )[ where + 1 ] = ( *invert_list )[ where ]; - -/* Store the new WinMap in the place of the SphMap. */ - ( *map_list )[ where ] = astClone( wm ); - ( *invert_list )[ where ] = 0; - -/* Return the index of the first modified element. */ - result = where; - } - -/* Free resources. */ - wm = astAnnul( wm ); - } - } - -/* If an error occurred, clear the returned result. */ - if ( !astOK ) result = -1; - -/* Return the result. */ - return result; -} - -static void SetAttrib( AstObject *this_object, const char *setting, int *status ) { -/* -* Name: -* SetAttrib - -* Purpose: -* Set an attribute value for a SphMap. - -* Type: -* Private function. - -* Synopsis: -* #include "sphmap.h" -* void SetAttrib( AstObject *this, const char *setting ) - -* Class Membership: -* SphMap member function (over-rides the astSetAttrib protected -* method inherited from the Mapping class). - -* Description: -* This function assigns an attribute value for a SphMap, the -* attribute and its value being specified by means of a string of -* the form: -* -* "attribute= value " -* -* Here, "attribute" specifies the attribute name and should be in -* lower case with no white space present. The value to the right -* of the "=" should be a suitable textual representation of the -* value to be assigned and this will be interpreted according to -* the attribute's data type. White space surrounding the value is -* only significant for string attributes. - -* Parameters: -* this -* Pointer to the SphMap. -* setting -* Pointer to a null-terminated string specifying the new attribute -* value. -*/ - -/* Local Variables: */ - AstSphMap *this; /* Pointer to the SphMap structure */ - double dval; /* Double precision attribute value */ - int len; /* Length of setting string */ - int ival; /* Int attribute value */ - int nc; /* Number of characters read by astSscanf */ - -/* Check the global error status. */ - if ( !astOK ) return; - -/* Obtain a pointer to the SphMap structure. */ - this = (AstSphMap *) this_object; - -/* Obtain the length of the setting string. */ - len = (int) strlen( setting ); - -/* UnitRadius */ -/* ---------- */ - if ( nc = 0, - ( 1 == astSscanf( setting, "unitradius= %d %n", &ival, &nc ) ) - && ( nc >= len ) ) { - astSetUnitRadius( this, ival ); - -/* PolarLong */ -/* --------- */ - } else if ( nc = 0, - ( 1 == astSscanf( setting, "polarlong= %lf %n", &dval, &nc ) ) - && ( nc >= len ) ) { - astSetPolarLong( this, dval ); - -/* If the attribute is still not recognised, pass it on to the parent - method for further interpretation. */ - } else { - (*parent_setattrib)( this_object, setting, status ); - } -} - -static int TestAttrib( AstObject *this_object, const char *attrib, int *status ) { -/* -* Name: -* TestAttrib - -* Purpose: -* Test if a specified attribute value is set for a SphMap. - -* Type: -* Private function. - -* Synopsis: -* #include "sphmap.h" -* int TestAttrib( AstObject *this, const char *attrib, int *status, int *status ) - -* Class Membership: -* SphMap member function (over-rides the astTestAttrib protected -* method inherited from the Mapping class). - -* Description: -* This function returns a boolean result (0 or 1) to indicate whether -* a value has been set for one of a SphMap's attributes. - -* Parameters: -* this -* Pointer to the SphMap. -* attrib -* Pointer to a null-terminated string specifying the attribute -* name. This should be in lower case with no surrounding white -* space. -* status -* Pointer to the inherited status variable. -* status -* Pointer to the inherited status variable. - -* Returned Value: -* One if a value has been set, otherwise zero. - -* Notes: -* - A value of zero will be returned if this function is invoked -* with the global status set, or if it should fail for any reason. -*/ - -/* Local Variables: */ - AstSphMap *this; /* Pointer to the SphMap structure */ - int result; /* Result value to return */ - -/* Initialise. */ - result = 0; - -/* Check the global error status. */ - if ( !astOK ) return result; - -/* Obtain a pointer to the SphMap structure. */ - this = (AstSphMap *) this_object; - -/* UnitRadius */ -/* ---------- */ - if ( !strcmp( attrib, "unitradius" ) ) { - result = astTestUnitRadius( this ); - -/* PolarLong */ -/* --------- */ - } else if ( !strcmp( attrib, "polarlong" ) ) { - result = astTestPolarLong( this ); - -/* If the attribute is still not recognised, pass it on to the parent - method for further interpretation. */ - } else { - result = (*parent_testattrib)( this_object, attrib, status ); - } - -/* Return the result, */ - return result; -} - -static AstPointSet *Transform( AstMapping *this, AstPointSet *in, - int forward, AstPointSet *out, int *status ) { -/* -* Name: -* Transform - -* Purpose: -* Apply a SphMap to transform a set of points. - -* Type: -* Private function. - -* Synopsis: -* #include "sphmap.h" -* AstPointSet *Transform( AstMapping *this, AstPointSet *in, -* int forward, AstPointSet *out, int *status, int *status ) - -* Class Membership: -* SphMap member function (over-rides the astTransform protected -* method inherited from the Mapping class). - -* Description: -* This function takes a SphMap and a set of points encapsulated in a -* PointSet and transforms the points from Cartesian coordinates to -* spherical coordinates. - -* Parameters: -* this -* Pointer to the SphMap. -* 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. -* 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 SphMap 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 */ - AstSphMap *map; /* Pointer to SphMap to be applied */ - double **ptr_in; /* Pointer to input coordinate data */ - double **ptr_out; /* Pointer to output coordinate data */ - int npoint; /* Number of points */ - int point; /* Loop counter for points */ - double *p0; /* Pointer to x axis value */ - double *p1; /* Pointer to y axis value */ - double *p2; /* Pointer to z axis value */ - double *q0; /* Pointer to longitude value */ - double *q1; /* Pointer to latitude value */ - double mxerr; /* Largest value which is effectively zero */ - double polarlong; /* Longitude at either pole */ - double v[3]; /* Vector for a single point */ - -/* Check the global error status. */ - if ( !astOK ) return NULL; - -/* Obtain a pointer to the SphMap. */ - map = (AstSphMap *) this; - -/* Apply the parent mapping using the stored pointer to the Transform member - function inherited from the parent Mapping class. This function validates - all arguments and generates an output PointSet if necessary, but does not - actually transform any coordinate values. */ - result = (*parent_transform)( this, in, forward, out, status ); - -/* We will now extend the parent astTransform method by performing the - calculations needed to generate the output coordinate values. */ - -/* Determine the numbers of points and coordinates per point from the input - PointSet and obtain pointers for accessing the input and output coordinate - values. */ - npoint = astGetNpoint( in ); - ptr_in = astGetPoints( in ); - ptr_out = astGetPoints( result ); - -/* Determine whether to apply the forward or inverse mapping, according to the - direction specified and whether the mapping has been inverted. */ - if ( astGetInvert( map ) ) forward = !forward; - -/* Perform coordinate arithmetic. */ -/* ------------------------------ */ - if( astOK ){ - -/* First deal with forward mappings from Cartesian to Spherical. */ - if( forward ){ - -/* Get the longitude to return at either pole. */ - polarlong = astGetPolarLong( this ); - -/* Store pointers to the input Cartesian axes. */ - p0 = ptr_in[ 0 ]; - p1 = ptr_in[ 1 ]; - p2 = ptr_in[ 2 ]; - -/* Store pointers to the output Spherical axes. */ - q0 = ptr_out[ 0 ]; - q1 = ptr_out[ 1 ]; - -/* Apply the mapping to every point. */ - for( point = 0; point < npoint; point++ ){ - if( *p0 != AST__BAD && *p1 != AST__BAD && *p2 != AST__BAD ){ - v[0] = *p0; - v[1] = *p1; - v[2] = *p2; - -/* At either pole, return the longitude equal to PolarLong attribute. */ - mxerr = fabs( 1000.0*v[ 2 ] )*DBL_EPSILON; - if( fabs( v[ 0 ] ) < mxerr && fabs( v[ 1 ] ) < mxerr ) { - if( v[ 2 ] < 0.0 ) { - *(q0++) = polarlong; - *(q1++) = -AST__DPIBY2; - } else if( v[ 2 ] > 0.0 ) { - *(q0++) = polarlong; - *(q1++) = AST__DPIBY2; - } else { - *(q0++) = AST__BAD; - *(q1++) = AST__BAD; - } - -/* Otherwise use a SLALIB function to do the conversion (SLALIB always - returns zero at either pole which is why we make the above check). */ - } else { - palDcc2s( v, q0++, q1++ ); - } - - } else { - *(q0++) = AST__BAD; - *(q1++) = AST__BAD; - } - p0++; - p1++; - p2++; - } - -/* Now deal with inverse mappings from Spherical to Cartesian. */ - } else { - -/* Store pointers to the input Spherical axes. */ - q0 = ptr_in[ 0 ]; - q1 = ptr_in[ 1 ]; - -/* Store pointers to the output Cartesian axes. */ - p0 = ptr_out[ 0 ]; - p1 = ptr_out[ 1 ]; - p2 = ptr_out[ 2 ]; - -/* Apply the mapping to every point. */ - for( point = 0; point < npoint; point++ ){ - if( *q0 != AST__BAD && *q1 != AST__BAD ){ - palDcs2c( *q0, *q1, v ); - *(p0++) = v[ 0 ]; - *(p1++) = v[ 1 ]; - *(p2++) = v[ 2 ]; - } else { - *(p0++) = AST__BAD; - *(p1++) = AST__BAD; - *(p2++) = AST__BAD; - - } - q0++; - q1++; - } - - } - - } - -/* 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). */ - -/* UnitRadius */ -/* ---------- */ -/* -*att++ -* Name: -* UnitRadius - -* Purpose: -* SphMap input vectors lie on a unit sphere? - -* Type: -* Public attribute. - -* Synopsis: -* Integer (boolean). - -* Description: -* This is a boolean attribute which indicates whether the -* 3-dimensional vectors which are supplied as input to a SphMap -* are known to always have unit length, so that they lie on a unit -* sphere centred on the origin. -* -c If this condition is true (indicated by setting UnitRadius -c non-zero), it implies that a CmpMap which is composed of a -c SphMap applied in the forward direction followed by a similar -c SphMap applied in the inverse direction may be simplified -c (e.g. by astSimplify) to become a UnitMap. This is because the -c input and output vectors will both have unit length and will -c therefore have the same coordinate values. -f If this condition is true (indicated by setting UnitRadius -f non-zero), it implies that a CmpMap which is composed of a -f SphMap applied in the forward direction followed by a similar -f SphMap applied in the inverse direction may be simplified -f (e.g. by AST_SIMPLIFY) to become a UnitMap. This is because the -f input and output vectors will both have unit length and will -f therefore have the same coordinate values. -* -* If UnitRadius is zero (the default), then although the output -* vector produced by the CmpMap (above) will still have unit -* length, the input vector may not have. This will, in general, -* change the coordinate values, so it prevents the pair of SphMaps -* being simplified. - -* Notes: -* - This attribute is intended mainly for use when SphMaps are -* involved in a sequence of Mappings which project (e.g.) a -* dataset on to the celestial sphere. By regarding the celestial -* sphere as a unit sphere (and setting UnitRadius to be non-zero) -* it becomes possible to cancel the SphMaps present, along with -* associated sky projections, when two datasets are aligned using -* celestial coordinates. This often considerably improves -* performance. -* - Such a situations often arises when interpreting FITS data and -* is handled automatically by the FitsChan class. -* - The value of the UnitRadius attribute is used only to control -* the simplification of Mappings and has no effect on the value of -* the coordinates transformed by a SphMap. The lengths of the -* input 3-dimensional Cartesian vectors supplied are always -* ignored, even if UnitRadius is non-zero. -* - The value of this attribute may changed only if the SphMap -* has no more than one reference. That is, an error is reported if the -* SphMap has been cloned, either by including it within another object -* such as a CmpMap or FrameSet or by calling the -c astClone -f AST_CLONE -* function. - -* Applicability: -* SphMap -* All SphMaps have this attribute. -*att-- -*/ -astMAKE_CLEAR1(SphMap,UnitRadius,unitradius,-1) -astMAKE_GET(SphMap,UnitRadius,int,0,(this->unitradius == -1 ? 0 : this->unitradius)) -astMAKE_SET1(SphMap,UnitRadius,int,unitradius,( value ? 1 : 0 )) -astMAKE_TEST(SphMap,UnitRadius,( this->unitradius != -1 )) - -/* PolarLong */ -/* --------- */ -/* -*att++ -* Name: -* PolarLong - -* Purpose: -* The longitude value to assign to either pole - -* Type: -* Public attribute. - -* Synopsis: -* Double precision. - -* Description: -* This attribute holds the longitude value, in radians, to be -* returned when a Cartesian position corresponding to either the north -* or south pole is transformed into spherical coordinates. The -* default value is zero. -* -* Note, the value of this attribute may changed only if the SphMap -* has no more than one reference. That is, an error is reported if the -* SphMap has been cloned, either by including it within another object -* such as a CmpMap or FrameSet or by calling the -c astClone -f AST_CLONE -* function. - -* Applicability: -* SphMap -* All SphMaps have this attribute. -*att-- -*/ -astMAKE_CLEAR1(SphMap,PolarLong,polarlong,AST__BAD) -astMAKE_GET(SphMap,PolarLong,double,0.0,(this->polarlong == AST__BAD ? 0.0 : this->polarlong)) -astMAKE_SET1(SphMap,PolarLong,double,polarlong,value) -astMAKE_TEST(SphMap,PolarLong,( this->polarlong != AST__BAD )) - -/* Copy constructor. */ -/* ----------------- */ -static void Copy( const AstObject *objin, AstObject *objout, int *status ) { -/* -* Name: -* Copy - -* Purpose: -* Copy constructor for SphMap objects. - -* Type: -* Private function. - -* Synopsis: -* void Copy( const AstObject *objin, AstObject *objout, int *status, int *status, int *status ) - -* Description: -* This function implements the copy constructor for SphMap objects. - -* Parameters: -* objin -* Pointer to the SphMap to be copied. -* objout -* Pointer to the SphMap being constructed. -* status -* Pointer to the inherited status variable. -* status -* Pointer to the inherited status variable. -* status -* Pointer to the inherited status variable. - -*/ - -} - -/* Destructor. */ -/* ----------- */ -static void Delete( AstObject *obj, int *status ) { -/* -* Name: -* Delete - -* Purpose: -* Destructor for SphMap objects. - -* Type: -* Private function. - -* Synopsis: -* void Delete( AstObject *obj, int *status, int *status ) - -* Description: -* This function implements the destructor for SphMap objects. - -* Parameters: -* obj -* Pointer to the SphMap to be deleted. -* status -* Pointer to the inherited status variable. -* 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. -*/ - - -} - -/* Dump function. */ -/* -------------- */ -static void Dump( AstObject *this_object, AstChannel *channel, int *status ) { -/* -* Name: -* Dump - -* Purpose: -* Dump function for SphMap objects. - -* Type: -* Private function. - -* Synopsis: -* void Dump( AstObject *this, AstChannel *channel, int *status, int *status, int *status, int *status ) - -* Description: -* This function implements the Dump function which writes out data -* for the SphMap class to an output Channel. - -* Parameters: -* this -* Pointer to the SphMap whose data are being written. -* channel -* Pointer to the Channel to which the data are being written. -* status -* Pointer to the inherited status variable. -* status -* Pointer to the inherited status variable. -* status -* Pointer to the inherited status variable. -* status -* Pointer to the inherited status variable. -*/ - -/* Local Variables: */ - AstSphMap *this; /* Pointer to the SphMap structure */ - double dval; /* Double precision attribute value */ - int ival; /* Integer value */ - int set; /* Attribute value set? */ - -/* Check the global error status. */ - if ( !astOK ) return; - -/* Obtain a pointer to the SphMap structure. */ - this = (AstSphMap *) this_object; - -/* Write out values representing the instance variables for the - SphMap 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. */ - -/* UnitRadius. */ -/* ------- */ - set = TestUnitRadius( this, status ); - ival = set ? GetUnitRadius( this, status ) : astGetUnitRadius( this ); - if( ival ) { - astWriteInt( channel, "UntRd", set, 0, ival, "All input vectors have unit length" ); - } else { - astWriteInt( channel, "UntRd", set, 0, ival, "Input vectors do not all have unit length" ); - } - -/* PolarLong. */ -/* ---------- */ - set = TestPolarLong( this, status ); - dval = set ? GetPolarLong( this, status ) : astGetPolarLong( this ); - astWriteDouble( channel, "PlrLg", set, 1, dval, "Polar longitude (rad.s)" ); - -} - -/* Standard class functions. */ -/* ========================= */ -/* Implement the astIsASphMap and astCheckSphMap functions using the macros - defined for this purpose in the "object.h" header file. */ -astMAKE_ISA(SphMap,Mapping) -astMAKE_CHECK(SphMap) - -AstSphMap *astSphMap_( const char *options, int *status, ...) { -/* -*++ -* Name: -c astSphMap -f AST_SPHMAP - -* Purpose: -* Create a SphMap. - -* Type: -* Public function. - -* Synopsis: -c #include "sphmap.h" -c AstSphMap *astSphMap( const char *options, ... ) -f RESULT = AST_SPHMAP( OPTIONS, STATUS ) - -* Class Membership: -* SphMap constructor. - -* Description: -* This function creates a new SphMap and optionally initialises -* its attributes. -* -* A SphMap is a Mapping which transforms points from a -* 3-dimensional Cartesian coordinate system into a 2-dimensional -* spherical coordinate system (longitude and latitude on a unit -* sphere centred at the origin). It works by regarding the input -* coordinates as position vectors and finding their intersection -* with the sphere surface. The inverse transformation always -* produces points which are a unit distance from the origin -* (i.e. unit vectors). - -* Parameters: -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 SphMap. 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 SphMap. 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 astSphMap() -f AST_SPHMAP = INTEGER -* A pointer to the new SphMap. - -* Notes: -* - The spherical coordinates are longitude (positive -* anti-clockwise looking from the positive latitude pole) and -* latitude. The Cartesian coordinates are right-handed, with the x -* axis (axis 1) at zero longitude and latitude, and the z axis -* (axis 3) at the positive latitude pole. -* - At either pole, the longitude is set to the value of the -* PolarLong attribute. -* - If the Cartesian coordinates are all zero, then the longitude -* and latitude are set to the value AST__BAD. -* - 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". - - -* 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". - - -* Status Handling: -* The protected interface to this function includes an extra -* parameter at the end of the parameter list descirbed above. This -* parameter is a pointer to the integer inherited status -* variable: "int *status". - -*-- -*/ - -/* Local Variables: */ - astDECLARE_GLOBALS /* Pointer to thread-specific global data */ - AstSphMap *new; /* Pointer to new SphMap */ - 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 SphMap, allocating memory and initialising the - virtual function table as well if necessary. */ - new = astInitSphMap( NULL, sizeof( AstSphMap ), !class_init, &class_vtab, - "SphMap" ); - -/* 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 SphMap'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 SphMap. */ - return new; -} - -AstSphMap *astSphMapId_( const char *options, ...) { -/* -* Name: -* astSphMapId_ - -* Purpose: -* Create a SphMap. - -* Type: -* Private function. - -* Synopsis: -* #include "sphmap.h" -* AstSphMap *astSphMapId_( const char *options, ... ) - -* Class Membership: -* SphMap constructor. - -* Description: -* This function implements the external (public) interface to the -* astSphMap constructor function. It returns an ID value (instead -* of a true C pointer) to external users, and must be provided -* because astSphMap_ 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 astSphMap_ 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 astSphMap_. - -* Returned Value: -* The ID value associated with the new SphMap. -*/ - -/* Local Variables: */ - astDECLARE_GLOBALS /* Pointer to thread-specific global data */ - AstSphMap *new; /* Pointer to new SphMap */ - 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 SphMap, allocating memory and initialising the - virtual function table as well if necessary. */ - new = astInitSphMap( NULL, sizeof( AstSphMap ), !class_init, &class_vtab, - "SphMap" ); - -/* 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 SphMap'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 SphMap. */ - return astMakeId( new ); -} - -AstSphMap *astInitSphMap_( void *mem, size_t size, int init, - AstSphMapVtab *vtab, const char *name, int *status ) { -/* -*+ -* Name: -* astInitSphMap - -* Purpose: -* Initialise a SphMap. - -* Type: -* Protected function. - -* Synopsis: -* #include "sphmap.h" -* AstSphMap *astInitSphMap( void *mem, size_t size, int init, -* AstSphMapVtab *vtab, const char *name ) - -* Class Membership: -* SphMap initialiser. - -* Description: -* This function is provided for use by class implementations to initialise -* a new SphMap object. It allocates memory (if necessary) to accommodate -* the SphMap plus any additional data associated with the derived class. -* It then initialises a SphMap 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 SphMap at the start of the memory passed via the -* "vtab" parameter. - -* Parameters: -* mem -* A pointer to the memory in which the SphMap is to be initialised. -* This must be of sufficient size to accommodate the SphMap data -* (sizeof(SphMap)) 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 SphMap (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 SphMap -* structure, so a valid value must be supplied even if not required for -* allocating memory. -* init -* A logical flag indicating if the SphMap'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 SphMap. -* 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). - -* Returned Value: -* A pointer to the new SphMap. - -* 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: */ - AstSphMap *new; /* Pointer to new SphMap */ - -/* Check the global status. */ - if ( !astOK ) return NULL; - -/* If necessary, initialise the virtual function table. */ - if ( init ) astInitSphMapVtab( vtab, name ); - -/* Initialise. */ - new = NULL; - -/* Initialise a Mapping structure (the parent class) as the first component - within the SphMap structure, allocating memory if necessary. Specify that - the Mapping should be defined in both the forward and inverse directions. */ - new = (AstSphMap *) astInitMapping( mem, size, 0, - (AstMappingVtab *) vtab, name, - 3, 2, 1, 1 ); - - if ( astOK ) { - -/* Initialise the SphMap data. */ -/* --------------------------- */ -/* Are all input vectors of unit length? Store a value of -1 to indicate that - no value has yet been set. This will cause a default value of 0 (no, i.e. - input vectors are not all of unit length) to be used. */ - new->unitradius = -1; - new->polarlong = AST__BAD; - - } - -/* Return a pointer to the new SphMap. */ - return new; -} - -AstSphMap *astLoadSphMap_( void *mem, size_t size, - AstSphMapVtab *vtab, const char *name, - AstChannel *channel, int *status ) { -/* -*+ -* Name: -* astLoadSphMap - -* Purpose: -* Load a SphMap. - -* Type: -* Protected function. - -* Synopsis: -* #include "sphmap.h" -* AstSphMap *astLoadSphMap( void *mem, size_t size, -* AstSphMapVtab *vtab, const char *name, -* AstChannel *channel ) - -* Class Membership: -* SphMap loader. - -* Description: -* This function is provided to load a new SphMap 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 -* SphMap 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 SphMap at the start of the memory -* passed via the "vtab" parameter. - - -* Parameters: -* mem -* A pointer to the memory into which the SphMap is to be -* loaded. This must be of sufficient size to accommodate the -* SphMap data (sizeof(SphMap)) 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 SphMap (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 SphMap 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(AstSphMap) is used instead. -* vtab -* Pointer to the start of the virtual function table to be -* associated with the new SphMap. If this is NULL, a pointer -* to the (static) virtual function table for the SphMap 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 "SphMap" is used instead. - -* Returned Value: -* A pointer to the new SphMap. - -* 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. -*- -*/ - -#define KEY_LEN 50 /* Maximum length of a keyword */ - -/* Local Variables: */ - astDECLARE_GLOBALS /* Pointer to thread-specific global data */ - AstSphMap *new; /* Pointer to the new SphMap */ - -/* 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 SphMap. In this case the - SphMap belongs to this class, so supply appropriate values to be - passed to the parent class loader (and its parent, etc.). */ - if ( !vtab ) { - size = sizeof( AstSphMap ); - vtab = &class_vtab; - name = "SphMap"; - -/* If required, initialise the virtual function table for this class. */ - if ( !class_init ) { - astInitSphMapVtab( 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 SphMap. */ - 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, "SphMap" ); - -/* 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. */ - -/* UnitRadius. */ -/* ----------- */ - new->unitradius = astReadInt( channel, "untrd", -1 ); - if ( TestUnitRadius( new, status ) ) SetUnitRadius( new, new->unitradius, status ); - -/* PolarLong. */ -/* ---------- */ - new->polarlong = astReadDouble( channel, "plrlg", AST__BAD ); - if ( TestPolarLong( new, status ) ) SetPolarLong( new, new->polarlong, status ); - - } - -/* If an error occurred, clean up by deleting the new SphMap. */ - if ( !astOK ) new = astDelete( new ); - -/* Return the new SphMap 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. */ - - - - - |