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author | William Joye <wjoye@cfa.harvard.edu> | 2016-11-02 19:16:17 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2016-11-02 19:16:17 (GMT) |
commit | 293057bdd882685f8ddad66bf77196a5853b08da (patch) | |
tree | 22c02c3808f490432f5f785c8bb665438169662b /ast/sphmap.h | |
parent | 87f20cbc44f8f6b53c00c37f89bc134a1f4cf29e (diff) | |
parent | d26ed8388f100a12996c0b92a98040ef2ba7fa8e (diff) | |
download | blt-293057bdd882685f8ddad66bf77196a5853b08da.zip blt-293057bdd882685f8ddad66bf77196a5853b08da.tar.gz blt-293057bdd882685f8ddad66bf77196a5853b08da.tar.bz2 |
Merge commit 'd26ed8388f100a12996c0b92a98040ef2ba7fa8e' as 'ast'
Diffstat (limited to 'ast/sphmap.h')
-rw-r--r-- | ast/sphmap.h | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/ast/sphmap.h b/ast/sphmap.h new file mode 100644 index 0000000..905703b --- /dev/null +++ b/ast/sphmap.h @@ -0,0 +1,374 @@ +#if !defined( SPHMAP_INCLUDED ) /* Include this file only once */ +#define SPHMAP_INCLUDED +/* +*+ +* Name: +* sphmap.h + +* Type: +* C include file. + +* Purpose: +* Define the interface to the SphMap class. + +* Invocation: +* #include "sphmap.h" + +* Description: +* This include file defines the interface to the SphMap class and +* provides the type definitions, function prototypes and macros, +* etc. needed to use this class. +* +* The SphMap class implements Mappings which maps positions from +* 3-dimensional Cartesian coordinates into 2-dimensional spherical +* coordinates (i.e. longitude and latitude on a unit sphere). The +* inverse Mapping always produces vectors of unit length. +* +* 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 values are set to AST__BAD. + +* Inheritance: +* The SphMap class inherits from the Mapping class. + +* Attributes Over-Ridden: +* None. + +* New Attributes Defined: +* PolarLong (double) +* 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. +* UnitRadius (integer) +* 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. +* +* If this condition is true (indicated by setting UnitRadius +* non-zero), it implies that a CmpMap which is composed of a +* SphMap applied in the forward direction followed by a similar +* SphMap applied in the inverse direction may be simplified +* (e.g. by astSimplify) to become a UnitMap. This is because +* the input and output vectors will both have unit length and +* will 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. + +* Methods Over-Ridden: +* Public: +* None. +* +* Protected: +* astClearAttrib +* Clear an attribute value for a SphMap. +* astGetAttrib +* Get an attribute value for a SphMap. +* astMapMerge +* Simplify a sequence of Mappings containing a SphMap. +* astSetAttrib +* Set an attribute value for a SphMap. +* astTestAttrib +* Test if an attribute value has been set for a SphMap. +* astTransform +* Apply a SphMap to transform a set of points. + +* New Methods Defined: +* Public: +* None. +* +* Protected: +* astClearUnitRadius +* Clear the UnitRadius attribute value for a SphMap. +* astGetUnitRadius +* Get the UnitRadius attribute value for a SphMap. +* astSetUnitRadius +* Set the UnitRadius attribute value for a SphMap. +* astTestUnitRadius +* Test if a UnitRadius attribute value has been set for a SphMap. +* astClearPolarLong +* Clear the PolarLong attribute value for a SphMap. +* astGetPolarLong +* Get the PolarLong attribute value for a SphMap. +* astSetPolarLong +* Set the PolarLong attribute value for a SphMap. +* astTestPolarLong +* Test if a PolarLong attribute value has been set for a SphMap. + +* Other Class Functions: +* Public: +* astIsASphMap +* Test class membership. +* astSphMap +* Create a SphMap. +* +* Protected: +* astCheckSphMap +* Validate class membership. +* astInitSphMap +* Initialise a SphMap. +* astInitSphMapVtab +* Initialise the virtual function table for the SphMap class. +* astLoadSphMap +* Load a SphMap. + +* Macros: +* None. + +* Type Definitions: +* Public: +* AstSphMap +* SphMap object type. +* +* Protected: +* AstSphMapVtab +* SphMap virtual function table type. + +* Feature Test Macros: +* astCLASS +* If the astCLASS macro is undefined, only public symbols are +* made available, otherwise protected symbols (for use in other +* class implementations) are defined. This macro also affects +* the reporting of error context information, which is only +* provided for external calls to the AST library. + +* 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: D.S. Berry (Starlink) + +* History: +* 25-OCT-1996 (DSB): +* Original version. +* 24-MAR-1998 (RFWS): +* Override the astMapMerge method. +* 4-SEP-1998 (DSB): +* Added UnitRadius attribute. +* 8-JAN-2003 (DSB): +* Added protected astInitSphMapVtab method. +* 11-JUN-2003 (DSB): +* Added PolarLong attribute. +*- +*/ + +/* Include files. */ +/* ============== */ +/* Interface definitions. */ +/* ---------------------- */ +#include "mapping.h" /* Coordinate mappings (parent class) */ + +#if defined(astCLASS) /* Protected */ +#include "pointset.h" /* Sets of points/coordinates */ +#include "channel.h" /* I/O channels */ +#endif + +/* C header files. */ +/* --------------- */ +#if defined(astCLASS) /* Protected */ +#include <stddef.h> +#endif + +/* Macros */ +/* ====== */ + +/* Define a dummy __attribute__ macro for use on non-GNU compilers. */ +#ifndef __GNUC__ +# define __attribute__(x) /*NOTHING*/ +#endif + +/* Type Definitions. */ +/* ================= */ +/* SphMap structure. */ +/* ------------------ */ +/* This structure contains all information that is unique to each object in + the class (e.g. its instance variables). */ +typedef struct AstSphMap { + +/* Attributes inherited from the parent class. */ + AstMapping mapping; /* Parent class structure */ + +/* Attributes specific to objects in this class. */ + double polarlong; /* Longitude to assign to either pole */ + int unitradius; /* Are input vectors always of unit length? */ +} AstSphMap; + +/* Virtual function table. */ +/* ----------------------- */ +/* This table contains all information that is the same for all + objects in the class (e.g. pointers to its virtual functions). */ +#if defined(astCLASS) /* Protected */ +typedef struct AstSphMapVtab { + +/* Properties (e.g. methods) inherited from the parent class. */ + AstMappingVtab mapping_vtab; /* Parent class virtual function table */ + +/* A Unique identifier to determine class membership. */ + AstClassIdentifier id; + +/* Properties (e.g. methods) specific to this class. */ + int (* GetUnitRadius)( AstSphMap *, int * ); + int (* TestUnitRadius)( AstSphMap *, int * ); + void (* ClearUnitRadius)( AstSphMap *, int * ); + void (* SetUnitRadius)( AstSphMap *, int, int * ); + + double (* GetPolarLong)( AstSphMap *, int * ); + int (* TestPolarLong)( AstSphMap *, int * ); + void (* ClearPolarLong)( AstSphMap *, int * ); + void (* SetPolarLong)( AstSphMap *, double, int * ); +} AstSphMapVtab; + +#if defined(THREAD_SAFE) + +/* Define a structure holding all data items that are global within this + class. */ +typedef struct AstSphMapGlobals { + AstSphMapVtab Class_Vtab; + int Class_Init; + char GetAttrib_Buff[ 51 ]; +} AstSphMapGlobals; +#endif + +#endif + +/* Function prototypes. */ +/* ==================== */ +/* Prototypes for standard class functions. */ +/* ---------------------------------------- */ +astPROTO_CHECK(SphMap) /* Check class membership */ +astPROTO_ISA(SphMap) /* Test class membership */ + +/* Constructor. */ +#if defined(astCLASS) /* Protected. */ +AstSphMap *astSphMap_( const char *, int *, ...); +#else +AstSphMap *astSphMapId_( const char *, ...)__attribute__((format(printf,1,2))); +#endif + +#if defined(astCLASS) /* Protected */ + +/* Initialiser. */ +AstSphMap *astInitSphMap_( void *, size_t, int, AstSphMapVtab *, + const char *, int * ); + +/* Vtab initialiser. */ +void astInitSphMapVtab_( AstSphMapVtab *, const char *, int * ); + +/* Loader. */ +AstSphMap *astLoadSphMap_( void *, size_t, AstSphMapVtab *, + const char *, AstChannel *, int * ); + +/* Thread-safe initialiser for all global data used by this module. */ +#if defined(THREAD_SAFE) +void astInitSphMapGlobals_( AstSphMapGlobals * ); +#endif + +#endif + +/* Prototypes for member functions. */ +/* -------------------------------- */ +# if defined(astCLASS) /* Protected */ +int astGetUnitRadius_( AstSphMap *, int * ); +int astTestUnitRadius_( AstSphMap *, int * ); +void astClearUnitRadius_( AstSphMap *, int * ); +void astSetUnitRadius_( AstSphMap *, int, int * ); + +double astGetPolarLong_( AstSphMap *, int * ); +int astTestPolarLong_( AstSphMap *, int * ); +void astClearPolarLong_( AstSphMap *, int * ); +void astSetPolarLong_( AstSphMap *, double, int * ); +#endif + +/* Function interfaces. */ +/* ==================== */ +/* These macros are wrap-ups for the functions defined by this class + to make them easier to invoke (e.g. to avoid type mis-matches when + passing pointers to objects from derived classes). */ + +/* Interfaces to standard class functions. */ +/* --------------------------------------- */ +/* Some of these functions provide validation, so we cannot use them + to validate their own arguments. We must use a cast when passing + object pointers (so that they can accept objects from derived + classes). */ + +/* Check class membership. */ +#define astCheckSphMap(this) astINVOKE_CHECK(SphMap,this,0) +#define astVerifySphMap(this) astINVOKE_CHECK(SphMap,this,1) + +/* Test class membership. */ +#define astIsASphMap(this) astINVOKE_ISA(SphMap,this) + +/* Constructor. */ +#if defined(astCLASS) /* Protected. */ +#define astSphMap astINVOKE(F,astSphMap_) +#else +#define astSphMap astINVOKE(F,astSphMapId_) +#endif + +#if defined(astCLASS) /* Protected */ + +/* Initialiser. */ +#define \ +astInitSphMap(mem,size,init,vtab,name) \ +astINVOKE(O,astInitSphMap_(mem,size,init,vtab,name,STATUS_PTR)) + +/* Vtab Initialiser. */ +#define astInitSphMapVtab(vtab,name) astINVOKE(V,astInitSphMapVtab_(vtab,name,STATUS_PTR)) +/* Loader. */ +#define astLoadSphMap(mem,size,vtab,name,channel) \ +astINVOKE(O,astLoadSphMap_(mem,size,vtab,name,astCheckChannel(channel),STATUS_PTR)) +#endif + +/* Interfaces to public member functions. */ +/* -------------------------------------- */ +/* Here we make use of astCheckSphMap to validate SphMap pointers + before use. This provides a contextual error report if a pointer + to the wrong sort of Object is supplied. */ + +#if defined(astCLASS) /* Protected */ +#define astClearUnitRadius(this) astINVOKE(V,astClearUnitRadius_(astCheckSphMap(this),STATUS_PTR)) +#define astGetUnitRadius(this) astINVOKE(V,astGetUnitRadius_(astCheckSphMap(this),STATUS_PTR)) +#define astSetUnitRadius(this,value) astINVOKE(V,astSetUnitRadius_(astCheckSphMap(this),value,STATUS_PTR)) +#define astTestUnitRadius(this) astINVOKE(V,astTestUnitRadius_(astCheckSphMap(this),STATUS_PTR)) + +#define astClearPolarLong(this) astINVOKE(V,astClearPolarLong_(astCheckSphMap(this),STATUS_PTR)) +#define astGetPolarLong(this) astINVOKE(V,astGetPolarLong_(astCheckSphMap(this),STATUS_PTR)) +#define astSetPolarLong(this,value) astINVOKE(V,astSetPolarLong_(astCheckSphMap(this),value,STATUS_PTR)) +#define astTestPolarLong(this) astINVOKE(V,astTestPolarLong_(astCheckSphMap(this),STATUS_PTR)) +#endif + +#endif + + + + + |