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author | William Joye <wjoye@cfa.harvard.edu> | 2019-05-10 18:41:55 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2019-05-10 18:41:55 (GMT) |
commit | 75fab9d80911f74aaab738fa9ab8a4f9b0f57a6b (patch) | |
tree | 8d0d428ac62291f834ea8927bfa82c115ff1689d /ast/circle.c | |
parent | 0609bafa2688ce94fbfdc1ea496b20c3fac732f1 (diff) | |
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upgrade ast 8.7.1
Diffstat (limited to 'ast/circle.c')
-rw-r--r-- | ast/circle.c | 2902 |
1 files changed, 0 insertions, 2902 deletions
diff --git a/ast/circle.c b/ast/circle.c deleted file mode 100644 index b26771c..0000000 --- a/ast/circle.c +++ /dev/null @@ -1,2902 +0,0 @@ -/* -*class++ -* Name: -* Circle - -* Purpose: -* A circular or spherical region within a Frame. - -* Constructor Function: -c astCircle -f AST_CIRCLE - -* Description: -* The Circle class implements a Region which represents a circle or -* sphere within a Frame. - -* Inheritance: -* The Circle class inherits from the Region class. - -* Attributes: -* The Circle class does not define any new attributes beyond -* those which are applicable to all Regions. - -* Functions: -c In addition to those functions applicable to all Regions, the -c following functions may also be applied to all Circles: -f In addition to those routines applicable to all Regions, the -f following routines may also be applied to all Circles: -* -c - astCirclePars: Get the geometric parameters of the Circle -f - AST_CIRCLEPARS: Get the geometric parameters of the Circle - -* Copyright: -* Copyright (C) 1997-2006 Council for the Central Laboratory of the -* Research Councils -* Copyright (C) 2009 Science & Technology Facilities Council. -* All Rights Reserved. - -* Licence: -* This program is free software: you can redistribute it and/or -* modify it under the terms of the GNU Lesser General Public -* License as published by the Free Software Foundation, either -* version 3 of the License, or (at your option) any later -* version. -* -* This program is distributed in the hope that it will be useful, -* but WITHOUT ANY WARRANTY; without even the implied warranty of -* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -* GNU Lesser General Public License for more details. -* -* You should have received a copy of the GNU Lesser General -* License along with this program. If not, see -* <http://www.gnu.org/licenses/>. - -* Authors: -* DSB: David S. Berry (Starlink) - -* History: -* 31-AUG-2004 (DSB): -* Original version. -* 4-NOV-2013 (DSB): -* Modify RegPins so that it can handle uncertainty regions that straddle -* a discontinuity. Previously, such uncertainty Regions could have a huge -* bounding box resulting in matching region being far too big. -*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 Circle - -/* Include files. */ -/* ============== */ -/* Interface definitions. */ -/* ---------------------- */ - -#include "globals.h" /* Thread-safe global data access */ -#include "error.h" /* Error reporting facilities */ -#include "memory.h" /* Memory allocation facilities */ -#include "object.h" /* Base Object class */ -#include "pointset.h" /* Sets of points/coordinates */ -#include "region.h" /* Coordinate regions (parent class) */ -#include "channel.h" /* I/O channels */ -#include "box.h" /* Box Regions */ -#include "wcsmap.h" /* Definitons of AST__DPI etc */ -#include "circle.h" /* Interface definition for this class */ -#include "ellipse.h" /* Interface definition for ellipse class */ -#include "mapping.h" /* Position mappings */ -#include "unitmap.h" /* Unit Mapping */ - -/* Error code definitions. */ -/* ----------------------- */ -#include "ast_err.h" /* AST error codes */ - -/* C header files. */ -/* --------------- */ -#include <float.h> -#include <math.h> -#include <stdarg.h> -#include <stddef.h> -#include <stdio.h> -#include <string.h> - -/* Module Variables. */ -/* ================= */ - -/* Address of this static variable is used as a unique identifier for - member of this class. */ -static int class_check; - -/* Pointers to parent class methods which are extended by this class. */ -static AstPointSet *(* parent_transform)( AstMapping *, AstPointSet *, int, AstPointSet *, int * ); -static AstMapping *(* parent_simplify)( AstMapping *, int * ); -static void (* parent_setregfs)( AstRegion *, AstFrame *, int * ); -static void (* parent_resetcache)( AstRegion *, 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(Circle) - -/* Define macros for accessing each item of thread specific global data. */ -#define class_init astGLOBAL(Circle,Class_Init) -#define class_vtab astGLOBAL(Circle,Class_Vtab) - - -#include <pthread.h> - - -#else - - -/* Define the class virtual function table and its initialisation flag - as static variables. */ -static AstCircleVtab 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. */ -AstCircle *astCircleId_( void *, int, const double[], const double[], void *, const char *, ... ); - -/* Prototypes for Private Member Functions. */ -/* ======================================== */ -static AstMapping *Simplify( AstMapping *, int * ); -static AstPointSet *RegBaseMesh( AstRegion *, int * ); -static AstPointSet *Transform( AstMapping *, AstPointSet *, int, AstPointSet *, int * ); -static double *CircumPoint( AstFrame *, int, const double *, double, int * ); -static double *RegCentre( AstRegion *this, double *, double **, int, int, int * ); -static int RegPins( AstRegion *, AstPointSet *, AstRegion *, int **, int * ); -static int RegTrace( AstRegion *, int, double *, double **, int * ); -static void Cache( AstCircle *, int * ); -static void CalcPars( AstFrame *, AstPointSet *, double *, double *, double *, int * ); -static void CirclePars( AstCircle *, double *, double *, double *, int * ); -static void Copy( const AstObject *, AstObject *, int * ); -static void Delete( AstObject *, int * ); -static void Dump( AstObject *, AstChannel *, int * ); -static void RegBaseBox( AstRegion *this, double *, double *, int * ); -static void ResetCache( AstRegion *this, int * ); -static void SetRegFS( AstRegion *, AstFrame *, int * ); - -/* Member functions. */ -/* ================= */ - -AstRegion *astBestCircle_( AstPointSet *mesh, double *cen, AstRegion *unc, int *status ){ -/* -*+ -* Name: -* astBestCircle - -* Purpose: -* Find the best fitting Circle through a given mesh of points. - -* Type: -* Protected function. - -* Synopsis: -* #include "circle.h" -* AstRegion *astBestCircle( AstPointSet *mesh, double *cen, AstRegion *unc ) - -* Class Membership: -* Circle member function - -* Description: -* This function finds the best fitting Circle through a given mesh of -* points. - -* Parameters: -* mesh -* Pointer to a PointSet holding the mesh of points. They are -* assumed to be in the Frame represented by "unc". -* cen -* Pointer to an array holding the coordinates of the new Circle -* centre. -* unc -* A Region representing the uncertainty associated with each point -* on the mesh. - -* Returned Value: -* Pointer to the best fitting Circle. It will inherit the positional -* uncertainty and Frame represented by "unc". - -* Notes: -* - A NULL pointer is returned if an error has already occurred, or if -* this function should fail for any reason. - -*- -*/ - -/* Local Variables: */ - AstRegion *result; - double *p; - double rad; - double **ptr; - double d; - double s2r; - double p0; - int ic; - int ip; - int n; - int nc; - int np; - -/* Initialise */ - result = NULL; - -/* Check the global error status. */ - if ( !astOK ) return result; - -/* Get no. of points in the mesh, and the number of axis values per point. */ - np = astGetNpoint( mesh ); - nc = astGetNcoord( mesh ); - -/* Get pointers to the axis values. */ - ptr = astGetPoints( mesh ); - -/* Check pointers can be used safely */ - if( astOK ) { - -/* We find ther sum of the squared axis increments from the supplied - centre to each of the supplied points. Initialise the sum to zero. */ - s2r = 0.0; - n = 0; - -/* Loop round all axes. */ - for( ic = 0; ic < nc; ic++ ) { - p = ptr[ ic ]; - p0 = cen[ ic ]; - -/* Loop round all values for this axis. */ - for( ip = 0; ip < np; ip++, p++ ) { - if( *p != AST__BAD ) { - -/* Increment the sums */ - d = *p - p0; - s2r += d*d; - n++; - - } - } - } - -/* Find the RMS distance of the points from the supplied centre. This is - the radius of the best fitting circle. */ - if( n > 0 ) { - rad = sqrt( nc*s2r/n ); - -/* Create the returned Region. */ - result = (AstRegion *) astCircle( unc, 1, cen, &rad, unc, "", status ); - } - } - -/* Return NULL if anything went wrong. */ - if( !astOK ) result = astAnnul( result ); - -/* Return the result.*/ - return result; -} - -static void Cache( AstCircle *this, int *status ){ -/* -* Name: -* Cache - -* Purpose: -* Calculate intermediate values and cache them in the Circle structure. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* void Cache( AstCircle *this, int *status ) - -* Class Membership: -* Circle member function - -* Description: -* This function uses the PointSet stored in the parent Region to calculate -* some intermediate values which are useful in other methods. These -* values are stored within the Circle structure. - -* Parameters: -* this -* Pointer to the Circle. -* status -* Pointer to the inherited status variable. - -*/ - -/* Local Variables: */ - AstFrame *frm; - double *centre; - double *lb; - double *ub; - double radius; - int i; - int nc; - -/* Check the global error status. */ - if ( !astOK ) return; - -/* Do Nothing if the cached information is up to date. */ - if( this->stale ) { - -/* Get a pointer to the base Frame and the number of base axes. */ - frm = astGetFrame( ((AstRegion *) this)->frameset, AST__BASE ); - nc = astGetNaxes( frm ); - -/* Allocate memory to hold the centre coords. */ - centre = astMalloc( sizeof( double )*astGetNaxes( frm ) ); - -/* Get the radius and centre of the Circle in the base Frame, using the - centre and circumference positions stored in the parent Region structure. */ - CalcPars( frm, ( (AstRegion *) this)->points, centre, &radius, NULL, - status ); - -/* Allocate memory to store the base frame bounding box. This is just - initialised here. It is set properly when the astRegBaseMesh - function is called. This box should not be used unless the "basemesh" - component of the parent Region structure is set to a non-null value. */ - lb = (double *) astMalloc( sizeof( double )*(size_t) nc ); - ub = (double *) astMalloc( sizeof( double )*(size_t) nc ); - -/* Initialise the bounding box. */ - for( i = 0; astOK && i < nc; i++ ) { - lb[ i ] = -DBL_MAX; - ub[ i ] = DBL_MAX; - } - -/* If everything went OK, store these values in the Circle structure. */ - if( astOK ) { - this->radius = radius; - - astFree( this->centre ); - this->centre = centre; - centre = NULL; - - astFree( this->lb ); - this->lb = lb; - lb = NULL; - - astFree( this->ub ); - this->ub = ub; - ub = NULL; - } - -/* Free resources */ - frm = astAnnul( frm ); - centre = astFree( centre ); - lb = astFree( lb ); - ub = astFree( ub ); - -/* Indicate cached information is up to date. */ - this->stale = 0; - } -} - -static void CalcPars( AstFrame *frm, AstPointSet *pset, double *centre, - double *radius, double *p1, int *status ){ -/* -* Name: -* CalcPars - -* Purpose: -* Calculate the geometric parameters of the supplied Circle. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* double *CalcPars( AstFrame *frm, AstPointSet *pset, double *centre, -* double *radius, double *p1, int *status ) - -* Class Membership: -* Circle member function - -* Description: -* This function uses the supplied PointSet to calculate the geometric -* parameters that describe the a crcle. These values are returned in -* a newly allocated dynamic array. - -* Parameters: -* frm -* Pointer to the Frame in which the circle is defined. -* pset -* Pointer to a PointSet. The first point should be the circle -* centre, and the second point should be a point on the circle -* circumference. -* centre -* An array in which to return the axis values at the circle centre. -* The length of this array should be no less than the number of -* axes in "frm". -* radius -* Pointer to a double in which to return the circle radius, -* expressed as a geodesic distance in the supplied Frame. -* p1 -* An array in which to return the coordinates of a point on the -* circumference of the circle. The length of this array should be -* no less than the number of axes in "frm". Can be NULL if the -* circumference position is not needed. -* status -* Pointer to the inherited status variable. - -*/ - -/* Local Variables: */ - double **ptr; - double *circum; - int i; - int nc; - -/* Check the global error status. */ - if ( !astOK ) return; - -/* Get and the number of axes. */ - nc = astGetNaxes( frm ); - -/* Get pointers to the coordinate data in the supplied PointSet. */ - ptr = astGetPoints( pset ); - -/* If no p1 array was supplied, create a temporary work array to hold the - circumference position. */ - if( !p1 ) { - circum = astMalloc( sizeof( double )*nc ); - } else { - circum = p1; - } - -/* Check pointers can be used safely. */ - if( ptr ) { - -/* Copy the two points in to the allocated memory. */ - for( i = 0; i < nc; i++ ) { - centre[ i ] = ptr[ i ][ 0 ]; - circum[ i ] = ptr[ i ][ 1 ]; - } - -/* Return the geodesic distance between these two points as the radius. */ - *radius = astDistance( frm, centre, circum ); - } - -/* Free any work array. */ - if( !p1 ) circum = astFree( circum ); -} - -static void CirclePars( AstCircle *this, double *centre, double *radius, - double *p1, int *status ){ -/* -*++ -* Name: -c astCirclePars -f AST_CIRCLEPARS - -* Purpose: -* Returns the geometric parameters of an Circle. - -* Type: -* Public virtual function. - -* Synopsis: -c #include "circle.h" -c void astCirclePars( AstCircle *this, double *centre, double *radius, -c double *p1 ) -f CALL AST_CIRCLEPARS( THIS, CENTRE, RADIUS, P1, STATUS ) - -* Class Membership: -* Region method. - -* Description: -c This function -f This routine -* returns the geometric parameters describing the supplied Circle. - -* Parameters: -c this -f THIS = INTEGER (Given) -* Pointer to the Region. -c centre -f CENTRE( * ) = DOUBLE PRECISION (Returned) -c Pointer to an array -f An array -* in which to return the coordinates of the Circle centre. -* The length of this array should be no less than the number of -* axes in the associated coordinate system. -c radius -f RADIUS = DOUBLE PRECISION (Returned) -* Returned holding the radius of the Circle, as an geodesic -* distance in the associated coordinate system. -c p1 -f P1( * ) = DOUBLE PRECISION (Returned) -c Pointer to an array -f An array -* in which to return the coordinates of a point on the -* circumference of the Circle. The length of this array should be -* no less than the number of axes in the associated coordinate system. -c A NULL pointer can be supplied if the circumference position is -c not needed. -f STATUS = INTEGER (Given and Returned) -f The global status. - -* Notes: -* - If the coordinate system represented by the Circle has been -* changed since it was first created, the returned parameters refer -* to the new (changed) coordinate system, rather than the original -* coordinate system. Note however that if the transformation from -* original to new coordinate system is non-linear, the shape -* represented by the supplied Circle object may not be an accurate -* circle. -*-- -*/ - -/* Local Variables: */ - AstRegion *this_region; /* Parent Region pointer */ - AstFrame *frm; /* Current Frame represented by the Circle */ - AstPointSet *pset; /* PointSet holding PointList axis values */ - -/* Check the inherited status. */ - if( !astOK ) return; - -/* Store a pointer to the parent region structure. */ - this_region = (AstRegion *) this; - -/* Transform the base Frame axis values into the current Frame. */ - pset = astTransform( this_region->frameset, this_region->points, 1, NULL ); - -/* Get the Circle frame. */ - frm = astGetFrame( this_region->frameset, AST__CURRENT ); - -/* Calculate the required parameters. */ - CalcPars( frm, pset, centre, radius, p1, status ); - -/* Free resources */ - frm = astAnnul( frm ); - pset = astAnnul( pset ); -} - -static double *CircumPoint( AstFrame *frm, int nax, const double *centre, - double radius, int *status ){ -/* -* Name: -* CircumPoint - -* Purpose: -* Find a point on the circumference of the circle. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* double *CircumPoint( AstFrame *frm, int nax, const double *centre, -* double radius, int *status ) - -* Class Membership: -* Circle member function - -* Description: -* This function returns a dynamically allocated array containing the -* axis values at a point on the circumference of the circle specified -* by a given centre and radius. The returned point is the point at -* which the circle crosses the first axis. - -* Parameters: -* frm -* Pointer to the Frame in which the circle is defined. -* nax -* The number of axes in the Frame. -* centre -* An array holding the axis values at the circle centre. -* radius -* The circle radius, expressed as a geodesic distance in the -* supplied Frame. -* status -* Pointer to the inherited status variable. - -* Returned Value: -* A pointer to a 1D array holding the axis values at the point where -* the circle crosses the first frame axis. The length of this array -* will equal the number of axes in the supsplied Frame. It should be -* freed using astFree when no longer needed. - -*/ - -/* Local Variables: */ - double *circum; - double *work; - int i; - -/* Check the global error status. */ - if ( !astOK ) return NULL; - -/* Allocate the returned array. */ - circum = astMalloc( sizeof( double)*(size_t) nax ); - -/* Allocate work space */ - work = astMalloc( sizeof( double)*(size_t) nax ); - -/* Check pointers can be used safely. */ - if( astOK ) { - -/* Find the coords of a point that is offset away from the centre - position along the first axis. We use the supplied radius value as a - convenient offset length, but the actual length used is not critical. */ - for( i = 0; i < nax; i++ ) work[ i ] = centre[ i ]; - work[ 0 ] = astAxOffset( frm, 1, work[ 0 ], radius ); - -/* Offset away from the centre position, towards the position found - above, going the distance specified by the supplied radius. */ - astOffset( frm, centre, work, radius, (double *) circum ); - } - -/* Free resources. */ - work = astFree( work ); - -/* Return the result. */ - return circum; -} - -void astInitCircleVtab_( AstCircleVtab *vtab, const char *name, int *status ) { -/* -*+ -* Name: -* astInitCircleVtab - -* Purpose: -* Initialise a virtual function table for a Circle. - -* Type: -* Protected function. - -* Synopsis: -* #include "circle.h" -* void astInitCircleVtab( AstCircleVtab *vtab, const char *name ) - -* Class Membership: -* Circle vtab initialiser. - -* Description: -* This function initialises the component of a virtual function -* table which is used by the Circle 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 */ - AstMappingVtab *mapping; /* Pointer to Mapping component of Vtab */ - AstRegionVtab *region; /* Pointer to Region 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. */ - astInitRegionVtab( (AstRegionVtab *) vtab, name ); - -/* Store a unique "magic" value in the virtual function table. This - will be used (by astIsACircle) 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 = &(((AstRegionVtab *) vtab)->id); - -/* Initialise member function pointers. */ -/* ------------------------------------ */ -/* Store pointers to the member functions (implemented here) that provide - virtual methods for this class. */ - vtab->CirclePars = CirclePars; - -/* Save the inherited pointers to methods that will be extended, and - replace them with pointers to the new member functions. */ - mapping = (AstMappingVtab *) vtab; - region = (AstRegionVtab *) vtab; - - parent_transform = mapping->Transform; - mapping->Transform = Transform; - - parent_simplify = mapping->Simplify; - mapping->Simplify = Simplify; - - parent_setregfs = region->SetRegFS; - region->SetRegFS = SetRegFS; - - parent_resetcache = region->ResetCache; - region->ResetCache = ResetCache; - - region->RegPins = RegPins; - region->RegTrace = RegTrace; - region->RegBaseMesh = RegBaseMesh; - region->RegBaseBox = RegBaseBox; - region->RegCentre = RegCentre; - -/* Store replacement pointers for methods which will be over-ridden by - new member functions implemented here. */ - -/* Declare the copy constructor, destructor and class dump - functions. */ - astSetDelete( vtab, Delete ); - astSetCopy( vtab, Copy ); - astSetDump( vtab, Dump, "Circle", "Circular or spherical region" ); - -/* 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 void RegBaseBox( AstRegion *this_region, double *lbnd, double *ubnd, int *status ){ -/* -* Name: -* RegBaseBox - -* Purpose: -* Returns the bounding box of an un-negated Region in the base Frame of -* the encapsulated FrameSet. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* void RegBaseBox( AstRegion *this, double *lbnd, double *ubnd, int *status ) - -* Class Membership: -* Circle member function (over-rides the astRegBaseBox protected -* method inherited from the Region class). - -* Description: -* This function returns the upper and lower axis bounds of a Region in -* the base Frame of the encapsulated FrameSet, assuming the Region -* has not been negated. That is, the value of the Negated attribute -* is ignored. - -* Parameters: -* this -* Pointer to the Region. -* lbnd -* Pointer to an array in which to return the lower axis bounds -* covered by the Region in the base Frame of the encapsulated -* FrameSet. It should have at least as many elements as there are -* axes in the base Frame. -* ubnd -* Pointer to an array in which to return the upper axis bounds -* covered by the Region in the base Frame of the encapsulated -* FrameSet. It should have at least as many elements as there are -* axes in the base Frame. -* status -* Pointer to the inherited status variable. - -*/ - -/* Local Variables: */ - AstCircle *this; /* Pointer to Circle structure */ - AstFrame *frm; /* Pointer to base Frame */ - const char *class; /* Pointer to class name */ - int i; /* Axis index */ - int nb; /* No. of axes in base Frame */ - -/* Check the global error status. */ - if ( !astOK ) return; - -/* Get a pointer to the Circle structure */ - this = (AstCircle *) this_region; - -/* Ensure cached information is available. */ - Cache( this, status ); - -/* Get a pointer to the base Frame in the Region, and get the number of - axes. */ - frm = astGetFrame( this_region->frameset, AST__BASE ); - nb = astGetNaxes( frm ); - -/* If the Frame is a simple Frame, we can assume plane geometry. */ - class = astGetClass( frm ); - if( class && !strcmp( class, "Frame" ) ) { - for( i = 0; i < nb; i++ ) { - lbnd[ i ] = ( this->centre )[ i ] - this->radius; - ubnd[ i ] = ( this->centre )[ i ] + this->radius; - } - -/* If the Frame is not a simple Frame we cannot assume plane geometry. */ - } else { - -/* The bounding box of the mesh returned by astRegBaseMesh is used as the - bounding box of the Circle. These bounds are cached in the Circle - structure by astRegBaseMesh. Ensure astRegBaseMesh has been invoked, - so that it is safe to use the cached bounding box. */ - if( !this_region->basemesh ) (void) astAnnul( astRegBaseMesh( this ) ); - -/* Store the bounding box. */ - for( i = 0; i < nb; i++ ) { - lbnd[ i ] = this->lb[ i ]; - ubnd[ i ] = this->ub[ i ]; - } - } - -/* Free resources. */ - frm = astAnnul( frm ); -} - -static AstPointSet *RegBaseMesh( AstRegion *this_region, int *status ){ -/* -* Name: -* RegBaseMesh - -* Purpose: -* Return a PointSet containing a mesh of points on the boundary of a -* Region in its base Frame. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* AstPointSet *astRegBaseMesh( AstRegion *this, int *status ) - -* Class Membership: -* Circle member function (over-rides the astRegBaseMesh protected -* method inherited from the Region class). - -* Description: -* This function returns a PointSet containing a mesh of points on the -* boundary of the Region. The points refer to the base Frame of -* the encapsulated FrameSet. - -* Parameters: -* this -* Pointer to the Region. -* status -* Pointer to the inherited status variable. - -* Returned Value: -* Pointer to the PointSet. The axis values in this PointSet will have -* associated accuracies derived from the accuracies which were -* supplied when the Region was created. - -* Notes: -* - A NULL pointer is returned if an error has already occurred, or if -* this function should fail for any reason. - -*/ - -/* Local Constants: */ -#define NP_EDGE 50 /* No. of points for determining geodesic */ - -/* Local Variables: */ - AstBox *box; /* Bounding box for this Circle */ - AstCircle *this; /* The Circle structure */ - AstRegion *reg; /* Copy of supplied Circle */ - AstFrame *frm; /* Base Frame in encapsulated FrameSet */ - AstPointSet *result; /* Returned pointer */ - double **ptr; /* Pointers to data */ - double *p1; /* Pointer to array holding a single point */ - double *p2; /* Pointer to array holding a single point */ - double angle; /* Angular position of point */ - double delta; /* Angular separation of points */ - double dist; /* Offset along an axis */ - double lbx; /* Lower x bound of mesh bounding box */ - double lby; /* Lower y bound of mesh bounding box */ - double p[ 2 ]; /* Position in 2D Frame */ - double ubx; /* Upper x bound of mesh bounding box */ - double uby; /* Upper y bound of mesh bounding box */ - int i; /* Point index */ - int j; /* Axis index */ - int naxes; /* No. of axes in base Frame */ - int np; /* No. of points in returned PointSet */ - -/* Initialise */ - result= NULL; - -/* Check the global error status. */ - if ( !astOK ) return result; - -/* If the Region structure contains a pointer to a PointSet holding - a previously created mesh, return it. */ - if( this_region->basemesh ) { - result = astClone( this_region->basemesh ); - -/* Otherwise, create a new mesh. */ - } else { - -/* Get a pointer to the Circle structure. */ - this = (AstCircle *) this_region; - -/* Get a pointer to the base Frame in the encapsulated FrameSet. */ - frm = astGetFrame( this_region->frameset, AST__BASE ); - -/* Get the number of axes in the base Frame */ - naxes = astGetNaxes( frm ); - -/* Get the requested number of points to put on the mesh. */ - np = astGetMeshSize( this ); - -/* Ensure cached information is available. */ - Cache( (AstCircle *) this, status ); - -/* First deal with 1-D "circles" (where we ignore MeshSize). */ - if( naxes == 1 ) { - -/* The boundary of a 1-D circle consists of 2 points - the two extreme values. - Create a PointSet to hold 2 1-D values, and store the extreme values. */ - result = astPointSet( 2, 1, "", status ); - ptr = astGetPoints( result ); - if( astOK ) { - ptr[ 0 ][ 0 ] = ( this->centre )[ 0 ] - this->radius; - ptr[ 0 ][ 1 ] = ( this->centre )[ 0 ] + this->radius; - } - -/* Store the bounding box in the Circle structure. */ - this->lb[ 0 ] = ptr[ 0 ][ 0 ]; - this->ub[ 0 ] = ptr[ 0 ][ 1 ]; - -/* Now deal with 2-D circles. */ - } else if( naxes == 2 ){ - -/* Store the angular increment between points. */ - delta = 2*AST__DPI/np; - -/* Create a suitable PointSet to hold the returned positions. */ - result = astPointSet( np, 2, "", status ); - ptr = astGetPoints( result ); - if( astOK ) { - -/* Initialise the bounding box of the mesh points. */ - lbx = DBL_MAX; - ubx = -DBL_MAX; - lby = DBL_MAX; - uby = -DBL_MAX; - -/* Loop round each point. */ - angle = 0.0; - for( i = 0; i < np; i++ ) { - -/* Work out where the end of the radius vector at this angle is, and - store in the returned PointSet. */ - astOffset2( frm, this->centre, angle, this->radius, p ); - ptr[ 0 ][ i ] = p[ 0 ]; - ptr[ 1 ][ i ] = p[ 1 ]; - -/* Update the bounds of the mesh bounding box. The box is expressed in - terms of axis offsets from the centre, in order to avoid problems with - boxes that cross RA=0 or RA=12h */ - if( p[ 0 ] != AST__BAD && p[ 1 ] != AST__BAD ){ - dist = astAxDistance( frm, 1, this->centre[ 0 ], p[ 0 ] ); - if( dist < lbx ) { - lbx = dist; - } else if( dist > ubx ) { - ubx = dist; - } - dist = astAxDistance( frm, 2, this->centre[ 1 ], p[ 1 ] ); - if( dist < lby ) { - lby = dist; - } else if( dist > uby ) { - uby = dist; - } - } - -/* Increment the angular position of the next mesh point. */ - angle += delta; - } - -/* Store the bounding box in the Circle structure. */ - this->lb[ 0 ] = this->centre[ 0 ] + lbx; - this->lb[ 1 ] = this->centre[ 1 ] + lby; - this->ub[ 0 ] = this->centre[ 0 ] + ubx; - this->ub[ 1 ] = this->centre[ 1 ] + uby; - } - -/* Now deal with circles with more than 2 dimensions. Producing an evenly - spread mesh of points over a sphere is a complex task (see e.g. - http://www.eso.org/science/healpix/ ). This implementation does not - attempt to produce a genuinely even spread. Instead it simply uses the - mesh for the bounding box of the sphere, and projects each point on to - the surface of the sphere. */ - } else { - -/* Allocate memory to hold an approximation of the circle bounding box. */ - p1 = astMalloc( sizeof( double )*(size_t) naxes ); - p2 = astMalloc( sizeof( double )*(size_t) naxes ); - -/* Get an approximation to the bounding box, and initialise the real - bounding box of the mesh points. */ - if( astOK ) { - memcpy( p1, this->centre, sizeof( double )*(size_t) naxes ); - for( j = 0; j < naxes; j++ ) { - p1[ j ] += this->radius; - astOffset( frm, this->centre, p1, this->radius, p2 ); - p1[ j ] = this->centre[ j ]; - this->ub[ j ] = p2[ j ]; - } - } - -/* Create a Box region which just encompasses the circle. */ - box = astBox( frm, 0, this->centre, this->ub, NULL, "", status ); - -/* Get a mesh covering this box. */ - astSetMeshSize( box, np ); - result = astRegBaseMesh( box ); - ptr = astGetPoints( result ); - np = astGetNpoint( result ); - -/* Allocate memory for a single point */ - if( astOK ) { - -/* Initialise the real bounding box of the mesh points. */ - for( j = 0; j < naxes; j++ ) { - this->lb[ j ] = DBL_MAX; - this->ub[ j ] = -DBL_MAX; - } - -/* Move each point in this mesh radially so that its distance from the centre - equals the radius of this Circle. */ - for( i = 0; i < np; i++ ) { - for( j = 0; j < naxes; j++ ) p1[ j ] = ptr[ j ][ i ]; - astOffset( frm, this->centre, p1, this->radius, p2 ); - - for( j = 0; j < naxes; j++ ) { - ptr[ j ][ i ] = p2[ j ]; - -/* Update the bounds of the mesh bounding box. */ - if( p2[ j ] != AST__BAD ){ - if( p2[ j ] < this->lb[ j ] ) { - this->lb[ j ] = p2[ j ]; - } else if( p2[ j ] > this->ub[ j ] ) { - this->ub[ j ] = p2[ j ]; - } - } - } - } - } - -/* Same the returned pointer in the Region structure so that it does not - need to be created again next time this function is called. */ - if( astOK && result ) this_region->basemesh = astClone( result ); - -/* Free resources. */ - p1 = astFree( p1 ); - p2 = astFree( p2 ); - box = astAnnul( box ); - } - -/* Extend the bounding box if it contains any singularies. The astNormBox - requires a Mapping which can be used to test points in the base Frame. - Create a copy of the Circle and then set its FrameSet so that the current - Frame in the copy is the same as the base Frame in the original. */ - reg = astCopy( this ); - astSetRegFS( reg, frm ); - astSetNegated( reg, 0 ); - -/* Normalise this box. */ - astNormBox( frm, this->lb, this->ub, reg ); - -/* Free resources. */ - reg = astAnnul( reg ); - frm = astAnnul( frm ); - } - -/* Annul the result if an error has occurred. */ - if( !astOK ) result = astAnnul( result ); - -/* Return a pointer to the output PointSet. */ - return result; -} - -static double *RegCentre( AstRegion *this_region, double *cen, double **ptr, - int index, int ifrm, int *status ){ -/* -* Name: -* RegCentre - -* Purpose: -* Re-centre a Region. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* double *RegCentre( AstRegion *this, double *cen, double **ptr, -* int index, int ifrm, int *status ) - -* Class Membership: -* Circle member function (over-rides the astRegCentre protected -* method inherited from the Region class). - -* Description: -* This function shifts the centre of the supplied Region to a -* specified position, or returns the current centre of the Region. - -* Parameters: -* this -* Pointer to the Region. -* cen -* Pointer to an array of axis values, giving the new centre. -* Supply a NULL value for this in order to use "ptr" and "index" to -* specify the new centre. -* ptr -* Pointer to an array of pointers, one for each axis in the Region. -* Each pointer locates an array of axis values. This is the format -* returned by the PointSet method astGetPoints. Only used if "cen" -* is NULL. -* index -* The index of the point within the arrays identified by "ptr" at -* which is stored the coords for the new centre position. Only used -* if "cen" is NULL. -* ifrm -* Should be AST__BASE or AST__CURRENT. Indicates whether the centre -* position is supplied and returned in the base or current Frame of -* the FrameSet encapsulated within "this". -* status -* Pointer to the inherited status variable. - -* Returned Value: -* If both "cen" and "ptr" are NULL then a pointer to a newly -* allocated dynamic array is returned which contains the centre -* coords of the Region. This array should be freed using astFree when -* no longer needed. If either of "ptr" or "cen" is not NULL, then a -* NULL pointer is returned. - -* Notes: -* - Some Region sub-classes do not have a centre. Such classes will report -* an AST__INTER error code if this method is called. -*/ - -/* Local Variables: */ - AstFrame *frm; /* Pointer to base Frame */ - AstCircle *this; /* Pointer to Circle structure */ - double **rptr; /* Data pointers for Region PointSet */ - double *bc; /* Base Frame centre position */ - double *circum; /* Base frame circumference position */ - double *result; /* Returned pointer */ - double *tmp; /* Temporary array pointer */ - double axval; /* Axis value */ - int ic; /* Coordinate index */ - int ncb; /* Number of base frame coordinate values per point */ - int ncc; /* Number of current frame coordinate values per point */ - -/* Initialise */ - result = NULL; - -/* Check the local error status. */ - if ( !astOK ) return result; - -/* Get a pointer to the Circle structure. */ - this = (AstCircle *) this_region; - -/* Get the number of axis values per point in the base and current Frames. */ - ncb = astGetNin( this_region->frameset ); - ncc = astGetNout( this_region->frameset ); - -/* Ensure cached information is available. */ - Cache( this, status ); - -/* If the centre coords are to be returned, return either a copy of the - base Frame centre coords, or transform the base Frame centre coords - into the current Frame. */ - if( !ptr && !cen ) { - if( ifrm == AST__CURRENT ) { - result = astRegTranPoint( this_region, this->centre, 1, 1 ); - } else { - result = astStore( NULL, this->centre, sizeof( double )*ncb ); - } - -/* Otherwise, we store the supplied new centre coords and return a NULL - pointer. */ - } else { - -/* Get a pointer to the base Frame in the Region's FrameSet. */ - frm = astGetFrame( this_region->frameset, AST__BASE ); - -/* Get a pointer to the axis values stored in the Region structure. */ - rptr = astGetPoints( this_region->points ); - -/* Check pointers can be used safely */ - if( astOK ) { - -/* If the centre position was supplied in the current Frame, find the - corresponding base Frame position... */ - if( ifrm == AST__CURRENT ) { - if( cen ) { - bc = astRegTranPoint( this_region, cen, 1, 0 ); - } else { - tmp = astMalloc( sizeof( double)*(size_t)ncc ); - if( astOK ) { - for( ic = 0; ic < ncc; ic++ ) tmp[ ic ] = ptr[ ic ][ index ]; - } - bc = astRegTranPoint( this_region, tmp, 1, 0 ); - tmp = astFree( tmp ); - } - -/* Replace any bad centre values with their current values. */ - for( ic = 0; ic < ncb; ic++ ) { - if( bc[ ic ] == AST__BAD ) bc[ ic ] = this->centre[ ic ]; - } - -/* ... and change the coords in the parent Region structure and the cached - coords in the Circle structure. */ - circum = CircumPoint( frm, ncb, bc, this->radius, status ); - if( circum ) { - for( ic = 0; ic < ncb; ic++ ) { - rptr[ ic ][ 0 ] = bc[ ic ]; - rptr[ ic ][ 1 ] = circum[ ic ]; - this->centre[ ic ] = bc[ ic ]; - } - } - -/* Free resources */ - circum = astFree( circum ); - bc = astFree( bc ); - -/* If the centre position was supplied in the base Frame, use the - supplied "cen" or "ptr" pointer directly to change the coords in the - parent Region structure and the cached coords in the Circle structure. */ - } else { - for( ic = 0; ic < ncb; ic++ ) { - axval = cen ? cen[ ic ] : ptr[ ic ][ index ]; - if( axval != AST__BAD ) this->centre[ ic ] = axval; - } - - circum = CircumPoint( frm, ncb, this->centre, this->radius, - status ); - if( circum ) { - for( ic = 0; ic < ncb; ic++ ) { - rptr[ ic ][ 0 ] = this->centre[ ic ]; - rptr[ ic ][ 1 ] = circum[ ic ]; - } - circum = astFree( circum ); - } - } - } - -/* Free resources */ - frm = astAnnul( frm ); - } - -/* Return the result. */ - return result; -} - -static int RegPins( AstRegion *this_region, AstPointSet *pset, AstRegion *unc, - int **mask, int *status ){ -/* -* Name: -* RegPins - -* Purpose: -* Check if a set of points fall on the boundary of a given Circle. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* int RegPins( AstRegion *this, AstPointSet *pset, AstRegion *unc, -* int **mask, int *status ){ - -* Class Membership: -* Circle member function (over-rides the astRegPins protected -* method inherited from the Region class). - -* Description: -* This function returns a flag indicating if the supplied set of -* points all fall on the boundary of the given Circle. -* -* Some tolerance is allowed, as specified by the uncertainty Region -* stored in the supplied Circle "this", and the supplied uncertainty -* Region "unc" which describes the uncertainty of the supplied points. - -* Parameters: -* this -* Pointer to the Circle. -* pset -* Pointer to the PointSet. The points are assumed to refer to the -* base Frame of the FrameSet encapsulated by "this". -* unc -* Pointer to a Region representing the uncertainties in the points -* given by "pset". The Region is assumed to represent the base Frame -* of the FrameSet encapsulated by "this". Zero uncertainity is assumed -* if NULL is supplied. -* mask -* Pointer to location at which to return a pointer to a newly -* allocated dynamic array of ints. The number of elements in this -* array is equal to the value of the Npoint attribute of "pset". -* Each element in the returned array is set to 1 if the -* corresponding position in "pset" is on the boundary of the Region -* and is set to zero otherwise. A NULL value may be supplied -* in which case no array is created. If created, the array should -* be freed using astFree when no longer needed. -* status -* Pointer to the inherited status variable. - -* Returned Value: -* Non-zero if the points all fall on the boundary of the given -* Region, to within the tolerance specified. Zero otherwise. - -*/ - -/* Local variables: */ - AstCircle *large_circle; /* Circle slightly larger than "this" */ - AstCircle *small_circle; /* Circle slightly smaller than "this" */ - AstCircle *this; /* Pointer to the Circle structure. */ - AstFrame *frm; /* Base Frame in supplied Circle */ - AstPointSet *ps1; /* Points masked by larger Circle */ - AstPointSet *ps2; /* Points masked by larger and smaller Circlees */ - AstRegion *tunc; /* Uncertainity Region from "this" */ - double **ptr; /* Pointer to axis values in "ps2" */ - double *lbnd_tunc; /* Lower bounds of "this" uncertainty Region */ - double *lbnd_unc; /* Lower bounds of supplied uncertainty Region */ - double *p; /* Pointer to next axis value */ - double *safe; /* An interior point in "this" */ - double *ubnd_tunc; /* Upper bounds of "this" uncertainty Region */ - double *ubnd_unc; /* Upper bounds of supplied uncertainty Region */ - double drad; /* Radius increment corresponding to border width */ - double l1; /* Length of bounding box diagonal */ - double l2; /* Length of bounding box diagonal */ - double rad; /* Radius of Circle */ - int i; /* Axis index */ - int j; /* Point index */ - int nc; /* No. of axes in Circle base frame */ - int np; /* No. of supplied points */ - int result; /* Returned flag */ - -/* Initialise */ - result = 0; - if( mask ) *mask = NULL; - -/* Check the inherited status. */ - if( !astOK ) return result; - -/* Get a pointer to the Circle structure. */ - this = (AstCircle *) this_region; - -/* Get the number of base Frame axes in the Circle, and check the supplied - PointSet has the same number of axis values per point. */ - frm = astGetFrame( this_region->frameset, AST__BASE ); - nc = astGetNaxes( frm ); - if( astGetNcoord( pset ) != nc && astOK ) { - astError( AST__INTER, "astRegPins(%s): Illegal number of axis " - "values per point (%d) in the supplied PointSet - should be " - "%d (internal AST programming error).", status, astGetClass( this ), - astGetNcoord( pset ), nc ); - } - -/* Get the number of axes in the uncertainty Region and check it is the - same as above. */ - if( unc && astGetNaxes( unc ) != nc && astOK ) { - astError( AST__INTER, "astRegPins(%s): Illegal number of axes (%d) " - "in the supplied uncertainty Region - should be " - "%d (internal AST programming error).", status, astGetClass( this ), - astGetNaxes( unc ), nc ); - } - -/* Get the centre of the region in the base Frame. We use this as a "safe" - interior point within the region. */ - safe = astRegCentre( this, NULL, NULL, 0, AST__BASE ); - -/* We now find the maximum distance on each axis that a point can be from the - boundary of the Circle for it still to be considered to be on the boundary. - First get the Region which defines the uncertainty within the Circle being - checked (in its base Frame), re-centre it on the interior point found - above (to avoid problems if the uncertainty region straddles a - discontinuity), and get its bounding box. */ - tunc = astGetUncFrm( this, AST__BASE ); - if( safe ) astRegCentre( tunc, safe, NULL, 0, AST__CURRENT ); - lbnd_tunc = astMalloc( sizeof( double )*(size_t) nc ); - ubnd_tunc = astMalloc( sizeof( double )*(size_t) nc ); - astGetRegionBounds( tunc, lbnd_tunc, ubnd_tunc ); - -/* Find the geodesic length within the base Frame of "this" of the diagonal of - the bounding box. */ - l1 = astDistance( frm, lbnd_tunc, ubnd_tunc ); - -/* Also get the Region which defines the uncertainty of the supplied - points and get its bounding box. First re-centre the uncertainty at the - interior position to avoid problems from uncertainties that straddle a - discontinuity. */ - if( unc ) { - if( safe ) astRegCentre( unc, safe, NULL, 0, AST__CURRENT ); - lbnd_unc = astMalloc( sizeof( double )*(size_t) nc ); - ubnd_unc = astMalloc( sizeof( double )*(size_t) nc ); - astGetRegionBounds( unc, lbnd_unc, ubnd_unc ); - -/* Find the geodesic length of the diagonal of this bounding box. */ - l2 = astDistance( frm, lbnd_unc, ubnd_unc ); - -/* Use a zero sized box "unc" if no box was supplied. */ - } else { - lbnd_unc = NULL; - ubnd_unc = NULL; - l2 = 0.0; - } - -/* Ensure cached information is available. */ - Cache( this, status ); - -/* The required border width is half of the total diagonal of the two bounding - boxes. */ - if( astOK ) { - drad = 0.5*( l1 + l2 ); - -/* Create two new Circle, one of which is larger than "this" by the amount - found above, and the other of which is smaller than "this" by the amount - found above. */ - rad = this->radius + 0.5*drad; - large_circle = astCircle( frm, 1, this->centre, &rad, NULL, "", status ); - rad = this->radius - 0.5*drad; - small_circle = astCircle( frm, 1, this->centre, &rad, NULL, "", status ); - -/* Negate the smaller region.*/ - astNegate( small_circle ); - -/* Points are on the boundary of "this" if they are inside both the large - Circle and the negated small Circle. First transform the supplied PointSet - using the large Circle, then transform them using the negated smaller - Circle. */ - ps1 = astTransform( large_circle, pset, 1, NULL ); - ps2 = astTransform( small_circle, ps1, 1, NULL ); - -/* Get a point to the resulting axis values, and the number of axis - values per axis. */ - ptr = astGetPoints( ps2 ); - np = astGetNpoint( ps2 ); - -/* If a mask array is to be returned, create one. */ - if( mask ) { - *mask = astMalloc( sizeof(int)*(size_t) np ); - -/* Check all the resulting points, setting mask values for all of them. */ - if( astOK ) { - -/* Initialise the mask elements on the basis of the first axis values */ - result = 1; - p = ptr[ 0 ]; - for( j = 0; j < np; j++ ) { - if( *(p++) == AST__BAD ) { - result = 0; - (*mask)[ j ] = 0; - } else { - (*mask)[ j ] = 1; - } - } - -/* Now check for bad values on other axes. */ - for( i = 1; i < nc; i++ ) { - p = ptr[ i ]; - for( j = 0; j < np; j++ ) { - if( *(p++) == AST__BAD ) { - result = 0; - (*mask)[ j ] = 0; - } - } - } - } - -/* If no output mask is to be made, we can break out of the check as soon - as the first bad value is found. */ - } else if( astOK ) { - result = 1; - for( i = 0; i < nc && result; i++ ) { - p = ptr[ i ]; - for( j = 0; j < np; j++ ) { - if( *(p++) == AST__BAD ) { - result = 0; - break; - } - } - } - } - -/* Free resources. */ - large_circle = astAnnul( large_circle ); - small_circle = astAnnul( small_circle ); - ps1 = astAnnul( ps1 ); - ps2 = astAnnul( ps2 ); - } - - tunc = astAnnul( tunc ); - frm = astAnnul( frm ); - lbnd_tunc = astFree( lbnd_tunc ); - ubnd_tunc = astFree( ubnd_tunc ); - if( unc ) lbnd_unc = astFree( lbnd_unc ); - if( unc ) ubnd_unc = astFree( ubnd_unc ); - safe = astFree( safe ); - -/* If an error has occurred, return zero. */ - if( !astOK ) { - result = 0; - if( mask ) *mask = astFree( *mask ); - } - -/* Return the result. */ - return result; -} - -static int RegTrace( AstRegion *this_region, int n, double *dist, double **ptr, - int *status ){ -/* -*+ -* Name: -* RegTrace - -* Purpose: -* Return requested positions on the boundary of a 2D Region. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* int astTraceRegion( AstRegion *this, int n, double *dist, double **ptr ); - -* Class Membership: -* Circle member function (overrides the astTraceRegion method -* inherited from the parent Region class). - -* Description: -* This function returns positions on the boundary of the supplied -* Region, if possible. The required positions are indicated by a -* supplied list of scalar parameter values in the range zero to one. -* Zero corresponds to some arbitrary starting point on the boundary, -* and one corresponds to the end (which for a closed region will be -* the same place as the start). - -* Parameters: -* this -* Pointer to the Region. -* n -* The number of positions to return. If this is zero, the function -* returns without action (but the returned function value still -* indicates if the method is supported or not). -* dist -* Pointer to an array of "n" scalar parameter values in the range -* 0 to 1.0. -* ptr -* A pointer to an array of pointers. The number of elements in -* this array should equal tthe number of axes in the Frame spanned -* by the Region. Each element of the array should be a pointer to -* an array of "n" doubles, in which to return the "n" values for -* the corresponding axis. The contents of the arrays are unchanged -* if the supplied Region belongs to a class that does not -* implement this method. - -* Returned Value: -* Non-zero if the astTraceRegion method is implemented by the class -* of Region supplied, and zero if not. - -*- -*/ - -/* Local Variables; */ - AstCircle *this; - AstFrame *frm; - AstMapping *map; - AstPointSet *bpset; - AstPointSet *cpset; - double **bptr; - double angle; - double p[ 2 ]; - int i; - int ncur; - int result; - -/* Initialise */ - result = 0; - -/* Check inherited status. */ - if( ! astOK ) return result; - -/* Get a pointer to the base Frame in the encapsulated FrameSet. */ - frm = astGetFrame( this_region->frameset, AST__BASE ); - -/* Check it is 2-dimensional. */ - if( astGetNaxes( frm ) == 2 ) result = 1; - -/* Check we have some points to find. */ - if( result && n > 0 ) { - -/* Get a pointer to the Circle structure. */ - this = (AstCircle *) this_region; - -/* Ensure cached information is available. */ - Cache( this, status ); - -/* We first determine the required positions in the base Frame of the - Region, and then transform them into the current Frame. Get the - base->current Mapping, and the number of current Frame axes. */ - map = astGetMapping( this_region->frameset, AST__BASE, AST__CURRENT ); - -/* If it's a UnitMap we do not need to do the transformation, so put the - base Frame positions directly into the supplied arrays. */ - if( astIsAUnitMap( map ) ) { - bpset = NULL; - bptr = ptr; - ncur = 2; - -/* Otherwise, create a PointSet to hold the base Frame positions. */ - } else { - bpset = astPointSet( n, 2, " ", status ); - bptr = astGetPoints( bpset ); - ncur = astGetNout( map ); - } - -/* Check the pointers can be used safely. */ - if( astOK ) { - -/* Loop round each point. Get the angle around the circle, and offset - along that angle to find the point that is one radius away from the - centre. Copy the results into the required arrays. */ - for( i = 0; i < n; i++ ) { - angle = dist[ i ]*2*AST__DPI; - astOffset2( frm, this->centre, angle, this->radius, p ); - bptr[ 0 ][ i ] = p[ 0 ]; - bptr[ 1 ][ i ] = p[ 1 ]; - } - - } - -/* If required, transform the base frame positions into the current - Frame, storing them in the supplied array. Then free resources. */ - if( bpset ) { - cpset = astPointSet( n, ncur, " ", status ); - astSetPoints( cpset, ptr ); - - (void) astTransform( map, bpset, 1, cpset ); - - cpset = astAnnul( cpset ); - bpset = astAnnul( bpset ); - } - -/* Free remaining resources. */ - map = astAnnul( map ); - } - frm = astAnnul( frm ); - -/* Return the result. */ - return result; -} - -static void ResetCache( AstRegion *this, int *status ){ -/* -* Name: -* ResetCache - -* Purpose: -* Clear cached information within the supplied Region. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* void ResetCache( AstRegion *this, int *status ) - -* Class Membership: -* Region member function (overrides the astResetCache method -* inherited from the parent Region class). - -* Description: -* This function clears cached information from the supplied Region -* structure. - -* Parameters: -* this -* Pointer to the Region. -* status -* Pointer to the inherited status variable. -*/ - if( this ) { - ( (AstCircle *) this )->stale = 1; - (*parent_resetcache)( this, status ); - } -} - -static void SetRegFS( AstRegion *this_region, AstFrame *frm, int *status ) { -/* -* Name: -* SetRegFS - -* Purpose: -* Stores a new FrameSet in a Region - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* void SetRegFS( AstRegion *this_region, AstFrame *frm, int *status ) - -* Class Membership: -* Circle method (over-rides the astSetRegFS method inherited from -* the Region class). - -* Description: -* This function creates a new FrameSet and stores it in the supplied -* Region. The new FrameSet contains two copies of the supplied -* Frame, connected by a UnitMap. - -* Parameters: -* this -* Pointer to the Region. -* frm -* The Frame to use. -* status -* Pointer to the inherited status variable. - -*/ - - -/* Check the global error status. */ - if ( !astOK ) return; - -/* Invoke the parent method to store the FrameSet in the parent Region - structure. */ - (* parent_setregfs)( this_region, frm, status ); - -/* Re-calculate cached information. */ - astResetCache( this_region ); -} - -static AstMapping *Simplify( AstMapping *this_mapping, int *status ) { -/* -* Name: -* Simplify - -* Purpose: -* Simplify the Mapping represented by a Region. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* AstMapping *Simplify( AstMapping *this, int *status ) - -* Class Membership: -* Circle method (over-rides the astSimplify method inherited -* from the Region class). - -* Description: -* This function invokes the parent Region Simplify method, and then -* performs any further region-specific simplification. -* -* If the Mapping from base to current Frame is not a UnitMap, this -* will include attempting to fit a new Region to the boundary defined -* in the current Frame. - -* Parameters: -* this -* Pointer to the original Region. -* status -* Pointer to the inherited status variable. - -* Returned Value: -* A pointer to the simplified Region. A cloned pointer to the -* supplied Region will be returned if no simplication could be -* performed. - -* Notes: -* - A NULL pointer value will be returned if this function is -* invoked with the AST error status set, or if it should fail for -* any reason. -*/ - -/* Local Variables: */ - AstMapping *map; /* Base -> current Mapping */ - AstMapping *result; /* Result pointer to return */ - AstPointSet *mesh; /* Mesh of current Frame positions */ - AstPointSet *ps2; /* Circle PointSet in current Frame */ - AstRegion *new; /* Pointer to simplified Region */ - AstRegion *newreg; /* Equivalent circle or ellipse */ - AstRegion *this; /* Pointer to supplied Region structure */ - AstRegion *unc; /* Pointer to uncertainty Region */ - double **ptr2; /* Pointer axis values in "ps2" */ - double *cen; /* Pointer to array holding new centre coords */ - int ic; /* Axis index */ - int nc; /* No. of axis values per point */ - int ok; /* Was the new centre found OK? */ - int simpler; /* Has some simplication taken place? */ - -/* Initialise. */ - result = NULL; - -/* Check the global error status. */ - if ( !astOK ) return result; - -/* Get a pointer to the supplied Region structure. */ - this = (AstRegion *) this_mapping; - -/* Invoke the parent Simplify method inherited from the Region class. This - will simplify the encapsulated FrameSet and uncertainty Region. */ - new = (AstRegion *) (*parent_simplify)( this_mapping, status ); - -/* Note if any simplification took place. This is assumed to be the case - if the pointer returned by the above call is different to the supplied - pointer. */ - simpler = ( new != this ); - -/* If the Mapping from base to current Frame is not a UnitMap, we attempt - to simplify the Circle by re-defining it within its current Frame. - Transforming the Circle from its base to its current Frame may result in - the region no longer being a circle. We test this by transforming a set of - bounds on the Circle boundary. */ - map = astGetMapping( new->frameset, AST__BASE, AST__CURRENT ); - if( !astIsAUnitMap( map ) ){ - -/* Get a mesh of points covering the Circle in its current Frame. */ - mesh = astRegMesh( new ); - -/* Get the Region describing the positional uncertainty within the Circle in - its current Frame. */ - unc = astGetUncFrm( new, AST__CURRENT ); - -/* Transform the PointSet holding the circle centre into the current - Frame, and copy the axis values into a new array. */ - ps2 = astRegTransform( this, this->points, 1, NULL, NULL ); - nc = astGetNcoord( ps2 ); - cen = astMalloc( sizeof( double )*(size_t) nc ); - ptr2 = astGetPoints( ps2 ); - if( astOK ) { - - ok = 1; - for( ic = 0; ic < nc; ic++ ) { - cen[ ic ] = ptr2[ ic ][ 0 ]; - if( cen[ ic ] == AST__BAD ) ok = 0; - } - -/* Find the best fitting Circle (defined in the current Frame) through these - points */ - newreg = ok ? astBestCircle( mesh, cen, unc ) : NULL; - -/* See if all points within this mesh fall on the boundary of the best - fitting Circle, to within the uncertainty of the Region. */ - if( newreg && astRegPins( newreg, mesh, NULL, NULL ) ) { - -/* If so, use the new Circle in place of the original. */ - (void) astAnnul( new ); - new = astClone( newreg ); - -/* Otherwise, if the region is 2-d we see if an Ellipse can represent the - mesh. */ - } else if( ok && nc == 2 ){ - -/* Find the best fitting Ellipse (defined in the current Frame) through these - points */ - if( newreg ) (void) astAnnul( newreg ); - newreg = astBestEllipse( mesh, cen, unc ); - -/* See if all points within this mesh fall on the boundary of the best - fitting Ellipse, to within the uncertainty of the Region. */ - if( newreg && astRegPins( newreg, mesh, NULL, NULL ) ) { - -/* If so, use the new Ellipse in place of the original. */ - (void) astAnnul( new ); - new = astClone( newreg ); - simpler = 1; - } - } - -/* Free resources. */ - if( newreg ) newreg = astAnnul( newreg ); - } - - ps2 = astAnnul( ps2 ); - cen = astFree( cen ); - mesh = astAnnul( mesh ); - unc = astAnnul( unc ); - } - map = astAnnul( map ); - -/* If any simplification could be performed, copy Region attributes from - the supplied Region to the returned Region, and return a pointer to it. - If the supplied Region had no uncertainty, ensure the returned Region - has no uncertainty. Otherwise, return a clone of the supplied pointer. */ - if( simpler ){ - astRegOverlay( new, this, 1 ); - result = (AstMapping *) new; - - } else { - new = astAnnul( new ); - result = astClone( this ); - } - -/* If an error occurred, annul the returned pointer. */ - if ( !astOK ) result = astAnnul( result ); - -/* Return the result. */ - return result; -} - -static AstPointSet *Transform( AstMapping *this_mapping, AstPointSet *in, - int forward, AstPointSet *out, int *status ) { -/* -* Name: -* Transform - -* Purpose: -* Apply a Circle to transform a set of points. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* AstPointSet *Transform( AstMapping *this, AstPointSet *in, -* int forward, AstPointSet *out, int *status ) - -* Class Membership: -* Circle member function (over-rides the astTransform protected -* method inherited from the Mapping class). - -* Description: -* This function takes a Circle and a set of points encapsulated in a -* PointSet and transforms the points by setting axis values to -* AST__BAD for all points which are outside the region. Points inside -* the region are copied unchanged from input to output. - -* Parameters: -* this -* Pointer to the Circle. -* in -* Pointer to the PointSet holding the input coordinate data. -* forward -* A non-zero value indicates that the forward coordinate transformation -* should be applied, while a zero value requests the inverse -* transformation. -* out -* Pointer to a PointSet which will hold the transformed (output) -* coordinate values. A NULL value may also be given, in which case a -* new PointSet will be created by this function. -* status -* Pointer to the inherited status variable. - -* Returned Value: -* Pointer to the output (possibly new) PointSet. - -* Notes: -* - The forward and inverse transformations are identical for a -* Region. -* - 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 axes in the Frame represented by the Circle. -* - 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: */ - AstCircle *this; /* Pointer to Circle */ - AstFrame *frm; /* Pointer to base Frame in FrameSet */ - AstPointSet *pset_tmp; /* Pointer to PointSet holding base Frame positions*/ - AstPointSet *result; /* Pointer to output PointSet */ - double **ptr_out; /* Pointer to output coordinate data */ - double **ptr_tmp; /* Pointer to base Frame coordinate data */ - double *work; /* Pointer to array holding single base point */ - double d; /* Base-Frame distance from centre to point */ - int closed; /* Is the boundary part of the Region? */ - int coord; /* Zero-based index for coordinates */ - int inside; /* Is the point inside the Region? */ - int ncoord_out; /* No. of coordinates per output point */ - int ncoord_tmp; /* No. of coordinates per base Frame point */ - int neg; /* Has the Region been negated? */ - int npoint; /* No. of points */ - int point; /* Loop counter for points */ - -/* Check the global error status. */ - if ( !astOK ) return NULL; - -/* Obtain a pointer to the Circle structure. */ - this = (AstCircle *) this_mapping; - -/* Apply the parent mapping using the stored pointer to the Transform member - function inherited from the parent Region class. This function validates - all arguments and generates an output PointSet if necessary, - containing a copy of the input PointSet. */ - result = (*parent_transform)( this_mapping, in, forward, out, status ); - -/* We will now extend the parent astTransform method by performing the - calculations needed to generate the output coordinate values. */ - -/* First use the encapsulated FrameSet to transform the supplied positions - from the current Frame in the encapsulated FrameSet (the Frame - represented by the Region), to the base Frame (the Frame in which the - Region is defined). This call also returns a pointer to the base Frame - of the encapsulated FrameSet. Note, the returned pointer may be a - clone of the "in" pointer, and so we must be carefull not to modify the - contents of the returned PointSet. */ - pset_tmp = astRegTransform( this, in, 0, NULL, &frm ); - -/* Determine the numbers of points and coordinates per point from the base - Frame PointSet and obtain pointers for accessing the base Frame and output - coordinate values. */ - npoint = astGetNpoint( pset_tmp ); - ncoord_tmp = astGetNcoord( pset_tmp ); - ptr_tmp = astGetPoints( pset_tmp ); - ncoord_out = astGetNcoord( result ); - ptr_out = astGetPoints( result ); - -/* Get work space for one base Frame position */ - work = astMalloc( sizeof( double )*(size_t) ncoord_tmp ); - -/* See if the boundary is part of the Region. */ - closed = astGetClosed( this ); - -/* See if the Region has been negated. */ - neg = astGetNegated( this ); - -/* Perform coordinate arithmetic. */ -/* ------------------------------ */ - if ( astOK ) { - -/* Ensure cached information is available. */ - Cache( this, status ); - -/* Loop round each point */ - for ( point = 0; point < npoint; point++ ) { - -/* Copy the base Frame position into a work array. */ - for ( coord = 0; coord < ncoord_tmp; coord++ ) { - work[ coord ] = ptr_tmp[ coord ][ point ]; - } - -/* Find the geodesic distance from the centre of the Circle in the base - Frame. */ - d = astDistance( frm, this->centre, work ); - -/* Now consider whether this radius value puts the point in or out of the - Circle. */ - if( d != AST__BAD ){ - if( neg ) { - if( closed ) { - inside = ( d >= this->radius ); - } else { - inside = ( d > this->radius ); - } - } else { - if( closed ) { - inside = ( d <= this->radius ); - } else { - inside = ( d < this->radius ); - } - } - } else { - inside = 0; - } - -/* If the point is outside, store bad output values. */ - if( !inside ) { - for ( coord = 0; coord < ncoord_out; coord++ ) { - ptr_out[ coord ][ point ] = AST__BAD; - } - } - } - } - -/* Free resources */ - work = astFree( work ); - pset_tmp = astAnnul( pset_tmp ); - frm = astAnnul( frm ); - -/* Annul the result if an error has occurred. */ - if( !astOK ) result = astAnnul( result ); - -/* Return a pointer to the output PointSet. */ - return result; -} - -/* Functions which access class attributes. */ -/* ---------------------------------------- */ -/* Implement member functions to access the attributes associated with - this class using the macros defined for this purpose in the - "object.h" file. For a description of each attribute, see the class - interface (in the associated .h file). */ - -/* Copy constructor. */ -/* ----------------- */ -static void Copy( const AstObject *objin, AstObject *objout, int *status ) { -/* -* Name: -* Copy - -* Purpose: -* Copy constructor for Region objects. - -* Type: -* Private function. - -* Synopsis: -* void Copy( const AstObject *objin, AstObject *objout, int *status ) - -* Description: -* This function implements the copy constructor for Region objects. - -* Parameters: -* objin -* Pointer to the object to be copied. -* objout -* Pointer to the object being constructed. -* status -* Pointer to the inherited status variable. - -* Notes: -* - This constructor makes a deep copy. -*/ - -/* Local Variables: */ - AstCircle *in; /* Pointer to input Circle */ - AstCircle *out; /* Pointer to output Circle */ - int nax; /* Number of base Frame axes */ - -/* Check the global error status. */ - if ( !astOK ) return; - -/* Obtain pointers to the input and output Circles. */ - in = (AstCircle *) objin; - out = (AstCircle *) objout; - -/* For safety, first clear any references to the input memory from - the output Circle. */ - out->centre = NULL; - out->lb = NULL; - out->ub = NULL; - -/* Copy dynamic memory contents */ - nax = astGetNin( ((AstRegion *) in)->frameset ); - out->centre = astStore( NULL, in->centre, - sizeof( double )*(size_t)nax ); - out->lb = astStore( NULL, in->lb, sizeof( double )*(size_t)nax ); - out->ub = astStore( NULL, in->ub, sizeof( double )*(size_t)nax ); -} - - -/* Destructor. */ -/* ----------- */ -static void Delete( AstObject *obj, int *status ) { -/* -* Name: -* Delete - -* Purpose: -* Destructor for Circle objects. - -* Type: -* Private function. - -* Synopsis: -* void Delete( AstObject *obj, int *status ) - -* Description: -* This function implements the destructor for Circle objects. - -* Parameters: -* obj -* Pointer to the object to be deleted. -* status -* Pointer to the inherited status variable. - -* Notes: -* This function attempts to execute even if the global error status is -* set. -*/ - -/* Local Variables: */ - AstCircle *this; /* Pointer to Circle */ - -/* Obtain a pointer to the Circle structure. */ - this = (AstCircle *) obj; - -/* Annul all resources. */ - this->centre = astFree( this->centre ); - this->lb = astFree( this->lb ); - this->ub = astFree( this->ub ); -} - -/* Dump function. */ -/* -------------- */ -static void Dump( AstObject *this_object, AstChannel *channel, int *status ) { -/* -* Name: -* Dump - -* Purpose: -* Dump function for Circle 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 Circle class to an output Channel. - -* Parameters: -* this -* Pointer to the Circle 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: */ - AstCircle *this; /* Pointer to the Circle structure */ - -/* Check the global error status. */ - if ( !astOK ) return; - -/* Obtain a pointer to the Circle structure. */ - this = (AstCircle *) this_object; - -/* Write out values representing the instance variables for the - Circle 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 astIsACircle and astCheckCircle functions using the macros - defined for this purpose in the "object.h" header file. */ -astMAKE_ISA(Circle,Region) -astMAKE_CHECK(Circle) - -AstCircle *astCircle_( void *frame_void, int form, const double centre[], - const double point[], AstRegion *unc, - const char *options, int *status, ...) { -/* -*++ -* Name: -c astCircle -f AST_CIRCLE - -* Purpose: -* Create a Circle. - -* Type: -* Public function. - -* Synopsis: -c #include "circle.h" -c AstCircle *astCircle( AstFrame *frame, int form, const double centre[], -c const double point[], AstRegion *unc, -c const char *options, ... ) -f RESULT = AST_CIRCLE( FRAME, FORM, CENTRE, POINT, UNC, OPTIONS, STATUS ) - -* Class Membership: -* Circle constructor. - -* Description: -* This function creates a new Circle and optionally initialises its -* attributes. -* -* A Circle is a Region which represents a circle or sphere within the -* supplied Frame. - -* Parameters: -c frame -f FRAME = INTEGER (Given) -* A pointer to the Frame in which the region is defined. A deep -* copy is taken of the supplied Frame. This means that any -* subsequent changes made to the Frame using the supplied pointer -* will have no effect the Region. -c form -f FORM = INTEGER (Given) -* Indicates how the circle is described by the remaining parameters. -* A value of zero indicates that the circle is specified by a -* centre position and a position on the circumference. A value of one -* indicates that the circle is specified by a centre position and a -* scalar radius. -c centre -f CENTRE( * ) = DOUBLE PRECISION (Given) -c An array of double, with one element for each Frame axis -f An array with one element for each Frame axis -* (Naxes attribute) containing the coordinates at the centre of -* the circle or sphere. -c point -f POINT( * ) = DOUBLE PRECISION (Given) -c If "form" -f If FORM -* is zero, then this array should have one element for each Frame -* axis (Naxes attribute), and should be supplied holding the -* coordinates at a point on the circumference of the circle or sphere. -c If "form" -f If FORM -* is one, then this array should have one element only which should -* be supplied holding the scalar radius of the circle or sphere, -* as a geodesic distance within the Frame. -c unc -f UNC = INTEGER (Given) -* An optional pointer to an existing Region which specifies the -* uncertainties associated with the boundary of the Circle being created. -* The uncertainty in any point on the boundary of the Circle is found by -* shifting the supplied "uncertainty" Region so that it is centred at -* the boundary point being considered. The area covered by the -* shifted uncertainty Region then represents the uncertainty in the -* boundary position. The uncertainty is assumed to be the same for -* all points. -* -* If supplied, the uncertainty Region must be of a class for which -* all instances are centro-symetric (e.g. Box, Circle, Ellipse, etc.) -* or be a Prism containing centro-symetric component Regions. A deep -* copy of the supplied Region will be taken, so subsequent changes to -* the uncertainty Region using the supplied pointer will have no -* effect on the created Circle. Alternatively, -f a null Object pointer (AST__NULL) -c a NULL Object pointer -* may be supplied, in which case a default uncertainty is used -* equivalent to a box 1.0E-6 of the size of the Circle being created. -* -* The uncertainty Region has two uses: 1) when the -c astOverlap -f AST_OVERLAP -* function compares two Regions for equality the uncertainty -* Region is used to determine the tolerance on the comparison, and 2) -* when a Region is mapped into a different coordinate system and -* subsequently simplified (using -c astSimplify), -f AST_SIMPLIFY), -* the uncertainties are used to determine if the transformed boundary -* can be accurately represented by a specific shape of Region. -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 Circle. 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 Circle. 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 astCircle() -f AST_CIRCLE = INTEGER -* A pointer to the new Circle. - -* 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 */ - AstFrame *frame; /* Pointer to Frame structure */ - AstCircle *new; /* Pointer to new Circle */ - va_list args; /* Variable argument list */ - -/* Get a pointer to the thread specific global data structure. */ - astGET_GLOBALS(NULL); - -/* Check the global status. */ - if ( !astOK ) return NULL; - -/* Obtain and validate a pointer to the supplied Frame structure. */ - frame = astCheckFrame( frame_void ); - -/* Initialise the Circle, allocating memory and initialising the - virtual function table as well if necessary. */ - new = astInitCircle( NULL, sizeof( AstCircle ), !class_init, &class_vtab, - "Circle", frame, form, centre, point, unc ); - -/* 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 Circle'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 Circle. */ - return new; -} - -AstCircle *astCircleId_( void *frame_void, int form, const double centre[], - const double point[], void *unc_void, - const char *options, ... ) { -/* -* Name: -* astCircleId_ - -* Purpose: -* Create a Circle. - -* Type: -* Private function. - -* Synopsis: -* #include "circle.h" -* AstCircle *astCircleId_( AstFrame *frame, int form, const double centre[], -* const double point[], AstRegion *unc, -* const char *options, ... ) - -* Class Membership: -* Circle constructor. - -* Description: -* This function implements the external (public) interface to the -* astCircle constructor function. It returns an ID value (instead -* of a true C pointer) to external users, and must be provided -* because astCircle_ 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 astCircle_ 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 astCircle_. - -* Returned Value: -* The ID value associated with the new Circle. -*/ - -/* Local Variables: */ - astDECLARE_GLOBALS /* Pointer to thread-specific global data */ - AstFrame *frame; /* Pointer to Frame structure */ - AstCircle *new; /* Pointer to new Circle */ - AstRegion *unc; /* Pointer to Region structure */ - va_list args; /* Variable argument list */ - - int *status; /* Get a pointer to the thread specific global data structure. */ - astGET_GLOBALS(NULL); - -/* Pointer to inherited status value */ - -/* Get a pointer to the inherited status value. */ - status = astGetStatusPtr; - -/* Check the global status. */ - if ( !astOK ) return NULL; - -/* Obtain a Frame pointer from the supplied ID and validate the - pointer to ensure it identifies a valid Frame. */ - frame = astVerifyFrame( astMakePointer( frame_void ) ); - -/* Obtain a Region pointer from the supplied "unc" ID and validate the - pointer to ensure it identifies a valid Region . */ - unc = unc_void ? astVerifyRegion( astMakePointer( unc_void ) ) : NULL; - -/* Initialise the Circle, allocating memory and initialising the - virtual function table as well if necessary. */ - new = astInitCircle( NULL, sizeof( AstCircle ), !class_init, &class_vtab, - "Circle", frame, form, centre, point, unc ); - -/* 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 Circle'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 Circle. */ - return astMakeId( new ); -} - -AstCircle *astInitCircle_( void *mem, size_t size, int init, AstCircleVtab *vtab, - const char *name, AstFrame *frame, int form, - const double centre[], const double point[], - AstRegion *unc, int *status ) { -/* -*+ -* Name: -* astInitCircle - -* Purpose: -* Initialise a Circle. - -* Type: -* Protected function. - -* Synopsis: -* #include "circle.h" -* AstCircle *astInitCircle_( void *mem, size_t size, int init, AstCircleVtab *vtab, -* const char *name, AstFrame *frame, int form, -* const double centre[], const double point[], -* AstRegion *unc ) - -* Class Membership: -* Circle initialiser. - -* Description: -* This function is provided for use by class implementations to initialise -* a new Circle object. It allocates memory (if necessary) to accommodate -* the Circle plus any additional data associated with the derived class. -* It then initialises a Circle 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 Circle at the start of the memory passed via the -* "vtab" parameter. - -* Parameters: -* mem -* A pointer to the memory in which the Circle is to be initialised. -* This must be of sufficient size to accommodate the Circle data -* (sizeof(Circle)) 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 Circle (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 Circle -* structure, so a valid value must be supplied even if not required for -* allocating memory. -* init -* A logical flag indicating if the Circle'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 Circle. -* name -* Pointer to a constant null-terminated character string which contains -* the name of the class to which the new object belongs (it is this -* pointer value that will subsequently be returned by the astGetClass -* method). -* frame -* A pointer to the Frame in which the region is defined. -* form -* Indicates how the "point" parameter should be interpreted. -* Should be either 0 or 1. -* centre -* An array of double, with one element for each Frame axis (Naxes -* attribute) containing the coordinates of the circle centre. -* point -* If "form" is zero, this should be an array of double, with one -* element for each Frame axis (Naxes attribute) containing the -* coordinates at any point on the circumference. If "form" is one, -* this should be the address of a double containing the scalar -* radius of the circle or sphere. -* unc -* A pointer to a Region which specifies the uncertainty in the -* supplied positions (all points on the boundary of the new Circle -* being initialised are assumed to have the same uncertainty). A NULL -* pointer can be supplied, in which case default uncertainties equal to -* 1.0E-6 of the dimensions of the new Circle's bounding box are used. -* If an uncertainty Region is supplied, it must be either a Box, a -* Circle or an Ellipse, and its encapsulated Frame must be related -* to the Frame supplied for parameter "frame" (i.e. astConvert -* should be able to find a Mapping between them). Two positions -* the "frame" Frame are considered to be co-incident if their -* uncertainty Regions overlap. The centre of the supplied -* uncertainty Region is immaterial since it will be re-centred on the -* point being tested before use. A deep copy is taken of the supplied -* Region. - -* Returned Value: -* A pointer to the new Circle. - -* 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: */ - AstCircle *new; /* Pointer to new Circle */ - AstPointSet *pset; /* PointSet to pass to Region initialiser */ - const double *circum; /* Pointer to circumference position */ - double **ptr; /* Pointer to coords data in pset */ - int i; /* Axis index */ - int nc; /* No. of axes */ - -/* Check the global status. */ - if ( !astOK ) return NULL; - -/* If necessary, initialise the virtual function table. */ - if ( init ) astInitCircleVtab( vtab, name ); - -/* Initialise. */ - new = NULL; - -/* Check the supplied value for "form" is legal. */ - if( form != 0 && form != 1 && astOK ) { - astError( AST__BADIN, "astInitCircle(%s): The value supplied for " - "parameter \"form\" (%d) is illegal - it should be 0 or 1 " - "(programming error).", status, name, form ); - } - -/* Get the number of axis values required for each position. */ - nc = astGetNaxes( frame ); - -/* If the circle radius has been supplied, find a point on the circle - circumference. */ - if( form == 1 ) { - circum = CircumPoint( frame, nc, centre, *point, status ); - -/* Otherwise, use the supplied circumference point. */ - } else { - circum = point; - } - -/* Create a PointSet to hold the centre position, and a point on the - circumference, and get points to the data arrays. */ - pset = astPointSet( 2, nc, "", status ); - ptr = astGetPoints( pset ); - -/* Copy the centre and circumference coordinates into the PointSet, checking - that no bad values have been supplied. */ - for( i = 0; astOK && i < nc; i++ ) { - if( centre[ i ] == AST__BAD ) { - astError( AST__BADIN, "astInitCircle(%s): The value of axis %d is " - "undefined at the circle centre.", status, name, i + 1 ); - } - if( astOK && circum[ i ] == AST__BAD ) { - astError( AST__BADIN, "astInitCircle(%s): The value of axis %d is " - "undefined on the circumference of the circle.", status, name, i + 1 ); - } - ptr[ i ][ 0 ] = centre[ i ]; - ptr[ i ][ 1 ] = circum[ i ]; - } - -/* Check pointers can be used safely. */ - if( astOK ) { - -/* Initialise a Region structure (the parent class) as the first component - within the Circle structure, allocating memory if necessary. */ - new = (AstCircle *) astInitRegion( mem, size, 0, (AstRegionVtab *) vtab, - name, frame, pset, unc ); - - if ( astOK ) { - -/* Initialise the Circle data. */ -/* ------------------------ */ - new->stale = 1; - new->centre = NULL; - new->lb = NULL; - new->ub = NULL; - Cache( new, status ); - -/* If an error occurred, clean up by deleting the new Circle. */ - if ( !astOK ) new = astDelete( new ); - } - } - -/* Free resources. */ - pset = astAnnul( pset ); - if( form == 1 ) circum = astFree( (void *) circum ); - -/* Return a pointer to the new Circle. */ - return new; -} - -AstCircle *astLoadCircle_( void *mem, size_t size, AstCircleVtab *vtab, - const char *name, AstChannel *channel, int *status ) { -/* -*+ -* Name: -* astLoadCircle - -* Purpose: -* Load a Circle. - -* Type: -* Protected function. - -* Synopsis: -* #include "circle.h" -* AstCircle *astLoadCircle( void *mem, size_t size, AstCircleVtab *vtab, -* const char *name, AstChannel *channel ) - -* Class Membership: -* Circle loader. - -* Description: -* This function is provided to load a new Circle 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 -* Circle 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 Circle at the start of the memory -* passed via the "vtab" parameter. - -* Parameters: -* mem -* A pointer to the memory into which the Circle is to be -* loaded. This must be of sufficient size to accommodate the -* Circle data (sizeof(Circle)) 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 Circle (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 Circle 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(AstCircle) is used instead. -* vtab -* Pointer to the start of the virtual function table to be -* associated with the new Circle. If this is NULL, a pointer -* to the (static) virtual function table for the Circle 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 "Circle" is used instead. - -* Returned Value: -* A pointer to the new Circle. - -* 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 */ - AstCircle *new; /* Pointer to the new Circle */ - -/* 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 Circle. In this case the - Circle belongs to this class, so supply appropriate values to be - passed to the parent class loader (and its parent, etc.). */ - if ( !vtab ) { - size = sizeof( AstCircle ); - vtab = &class_vtab; - name = "Circle"; - -/* If required, initialise the virtual function table for this class. */ - if ( !class_init ) { - astInitCircleVtab( 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 Circle. */ - new = astLoadRegion( mem, size, (AstRegionVtab *) 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, "Circle" ); - -/* 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. */ -/* ---------------------------- */ - -/* Cache intermediate results in the Circle structure */ - new->centre = NULL; - new->lb = NULL; - new->ub = NULL; - new->stale = 1; - Cache( new, status ); - -/* If an error occurred, clean up by deleting the new Circle. */ - if ( !astOK ) new = astDelete( new ); - } - -/* Return the new Circle 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. */ - - -void astCirclePars_( AstCircle *this, double *centre, double *radius, - double *p1, int *status ){ - if ( !astOK ) return; - (**astMEMBER(this,Circle,CirclePars))( this, centre, radius, - p1, status ); -} - - - - - - |