WCSLIB: lin.h Source File

WCSLIB 7.11

lin.h
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1/*============================================================================
2 WCSLIB 7.11 - an implementation of the FITS WCS standard.
3 Copyright (C) 1995-2022, Mark Calabretta
4
5 This file is part of WCSLIB.
6
7 WCSLIB is free software: you can redistribute it and/or modify it under the
8 terms of the GNU Lesser General Public License as published by the Free
9 Software Foundation, either version 3 of the License, or (at your option)
10 any later version.
11
12 WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
15 more details.
16
17 You should have received a copy of the GNU Lesser General Public License
18 along with WCSLIB. If not, see http://www.gnu.org/licenses.
19
20 Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
21 http://www.atnf.csiro.au/people/Mark.Calabretta
22 $Id: lin.h,v 7.11 2022/04/26 06:13:52 mcalabre Exp $
23*=============================================================================
24*
25* WCSLIB 7.11 - C routines that implement the FITS World Coordinate System
26* (WCS) standard. Refer to the README file provided with WCSLIB for an
27* overview of the library.
28*
29*
30* Summary of the lin routines
31* ---------------------------
32* Routines in this suite apply the linear transformation defined by the FITS
33* World Coordinate System (WCS) standard, as described in
34*
35= "Representations of world coordinates in FITS",
36= Greisen, E.W., & Calabretta, M.R. 2002, A&A, 395, 1061 (WCS Paper I)
37*
38* These routines are based on the linprm struct which contains all information
39* needed for the computations. The struct contains some members that must be
40* set by the user, and others that are maintained by these routines, somewhat
41* like a C++ class but with no encapsulation.
42*
43* Six routines, linini(), lininit(), lindis(), lindist() lincpy(), and
44* linfree() are provided to manage the linprm struct, linsize() computes its
45* total size including allocated memory, and linprt() prints its contents.
46*
47* linperr() prints the error message(s) (if any) stored in a linprm struct,
48* and the disprm structs that it may contain.
49*
50* A setup routine, linset(), computes intermediate values in the linprm struct
51* from parameters in it that were supplied by the user. The struct always
52* needs to be set up by linset() but need not be called explicitly - refer to
53* the explanation of linprm::flag.
54*
55* linp2x() and linx2p() implement the WCS linear transformations.
56*
57* An auxiliary routine, linwarp(), computes various measures of the distortion
58* over a specified range of pixel coordinates.
59*
60* An auxiliary matrix inversion routine, matinv(), is included. It uses
61* LU-triangular factorization with scaled partial pivoting.
62*
63*
64* linini() - Default constructor for the linprm struct
65* ----------------------------------------------------
66* linini() is a thin wrapper on lininit(). It invokes it with ndpmax set
67* to -1 which causes it to use the value of the global variable NDPMAX. It
68* is thereby potentially thread-unsafe if NDPMAX is altered dynamically via
69* disndp(). Use lininit() for a thread-safe alternative in this case.
70*
71*
72* lininit() - Default constructor for the linprm struct
73* -----------------------------------------------------
74* lininit() allocates memory for arrays in a linprm struct and sets all
75* members of the struct to default values.
76*
77* PLEASE NOTE: every linprm struct must be initialized by lininit(), possibly
78* repeatedly. On the first invokation, and only the first invokation,
79* linprm::flag must be set to -1 to initialize memory management, regardless
80* of whether lininit() will actually be used to allocate memory.
81*
82* Given:
83* alloc int If true, allocate memory unconditionally for arrays in
84* the linprm struct.
85*
86* If false, it is assumed that pointers to these arrays
87* have been set by the user except if they are null
88* pointers in which case memory will be allocated for
89* them regardless. (In other words, setting alloc true
90* saves having to initalize these pointers to zero.)
91*
92* naxis int The number of world coordinate axes, used to determine
93* array sizes.
94*
95* Given and returned:
96* lin struct linprm*
97* Linear transformation parameters. Note that, in order
98* to initialize memory management linprm::flag should be
99* set to -1 when lin is initialized for the first time
100* (memory leaks may result if it had already been
101* initialized).
102*
103* Given:
104* ndpmax int The number of DPja or DQia keywords to allocate space
105* for. If set to -1, the value of the global variable
106* NDPMAX will be used. This is potentially
107* thread-unsafe if disndp() is being used dynamically to
108* alter its value.
109*
110* Function return value:
111* int Status return value:
112* 0: Success.
113* 1: Null linprm pointer passed.
114* 2: Memory allocation failed.
115*
116* For returns > 1, a detailed error message is set in
117* linprm::err if enabled, see wcserr_enable().
118*
119*
120* lindis() - Assign a distortion to a linprm struct
121* -------------------------------------------------
122* lindis() is a thin wrapper on lindist(). It invokes it with ndpmax set
123* to -1 which causes the value of the global variable NDPMAX to be used (by
124* disinit()). It is thereby potentially thread-unsafe if NDPMAX is altered
125* dynamically via disndp(). Use lindist() for a thread-safe alternative in
126* this case.
127*
128*
129* lindist() - Assign a distortion to a linprm struct
130* --------------------------------------------------
131* lindist() may be used to assign the address of a disprm struct to
132* linprm::dispre or linprm::disseq. The linprm struct must already have been
133* initialized by lininit().
134*
135* The disprm struct must have been allocated from the heap (e.g. using
136* malloc(), calloc(), etc.). lindist() will immediately initialize it via a
137* call to disini() using the value of linprm::naxis. Subsequently, it will be
138* reinitialized by calls to lininit(), and freed by linfree(), neither of
139* which would happen if the disprm struct was assigned directly.
140*
141* If the disprm struct had previously been assigned via lindist(), it will be
142* freed before reassignment. It is also permissable for a null disprm pointer
143* to be assigned to disable the distortion correction.
144*
145* Given:
146* sequence int Is it a prior or sequent distortion?
147* 1: Prior, the assignment is to linprm::dispre.
148* 2: Sequent, the assignment is to linprm::disseq.
149*
150* Anything else is an error.
151*
152* Given and returned:
153* lin struct linprm*
154* Linear transformation parameters.
155*
156* dis struct disprm*
157* Distortion function parameters.
158*
159* Given:
160* ndpmax int The number of DPja or DQia keywords to allocate space
161* for. If set to -1, the value of the global variable
162* NDPMAX will be used. This is potentially
163* thread-unsafe if disndp() is being used dynamically to
164* alter its value.
165*
166* Function return value:
167* int Status return value:
168* 0: Success.
169* 1: Null linprm pointer passed.
170* 4: Invalid sequence.
171*
172*
173* lincpy() - Copy routine for the linprm struct
174* ---------------------------------------------
175* lincpy() does a deep copy of one linprm struct to another, using lininit()
176* to allocate memory for its arrays if required. Only the "information to be
177* provided" part of the struct is copied; a call to linset() is required to
178* initialize the remainder.
179*
180* Given:
181* alloc int If true, allocate memory for the crpix, pc, and cdelt
182* arrays in the destination. Otherwise, it is assumed
183* that pointers to these arrays have been set by the
184* user except if they are null pointers in which case
185* memory will be allocated for them regardless.
186*
187* linsrc const struct linprm*
188* Struct to copy from.
189*
190* Given and returned:
191* lindst struct linprm*
192* Struct to copy to. linprm::flag should be set to -1
193* if lindst was not previously initialized (memory leaks
194* may result if it was previously initialized).
195*
196* Function return value:
197* int Status return value:
198* 0: Success.
199* 1: Null linprm pointer passed.
200* 2: Memory allocation failed.
201*
202* For returns > 1, a detailed error message is set in
203* linprm::err if enabled, see wcserr_enable().
204*
205*
206* linfree() - Destructor for the linprm struct
207* --------------------------------------------
208* linfree() frees memory allocated for the linprm arrays by lininit() and/or
209* linset(). lininit() keeps a record of the memory it allocates and linfree()
210* will only attempt to free this.
211*
212* PLEASE NOTE: linfree() must not be invoked on a linprm struct that was not
213* initialized by lininit().
214*
215* Given:
216* lin struct linprm*
217* Linear transformation parameters.
218*
219* Function return value:
220* int Status return value:
221* 0: Success.
222* 1: Null linprm pointer passed.
223*
224*
225* linsize() - Compute the size of a linprm struct
226* -----------------------------------------------
227* linsize() computes the full size of a linprm struct, including allocated
228* memory.
229*
230* Given:
231* lin const struct linprm*
232* Linear transformation parameters.
233*
234* If NULL, the base size of the struct and the allocated
235* size are both set to zero.
236*
237* Returned:
238* sizes int[2] The first element is the base size of the struct as
239* returned by sizeof(struct linprm).
240*
241* The second element is the total size of memory
242* allocated in the struct, in bytes, assuming that the
243* allocation was done by linini(). This figure includes
244* memory allocated for members of constituent structs,
245* such as linprm::dispre.
246*
247* It is not an error for the struct not to have been set
248* up via linset(), which normally results in additional
249* memory allocation.
250*
251* Function return value:
252* int Status return value:
253* 0: Success.
254*
255*
256* linprt() - Print routine for the linprm struct
257* ----------------------------------------------
258* linprt() prints the contents of a linprm struct using wcsprintf(). Mainly
259* intended for diagnostic purposes.
260*
261* Given:
262* lin const struct linprm*
263* Linear transformation parameters.
264*
265* Function return value:
266* int Status return value:
267* 0: Success.
268* 1: Null linprm pointer passed.
269*
270*
271* linperr() - Print error messages from a linprm struct
272* -----------------------------------------------------
273* linperr() prints the error message(s) (if any) stored in a linprm struct,
274* and the disprm structs that it may contain. If there are no errors then
275* nothing is printed. It uses wcserr_prt(), q.v.
276*
277* Given:
278* lin const struct linprm*
279* Coordinate transformation parameters.
280*
281* prefix const char *
282* If non-NULL, each output line will be prefixed with
283* this string.
284*
285* Function return value:
286* int Status return value:
287* 0: Success.
288* 1: Null linprm pointer passed.
289*
290*
291* linset() - Setup routine for the linprm struct
292* ----------------------------------------------
293* linset(), if necessary, allocates memory for the linprm::piximg and
294* linprm::imgpix arrays and sets up the linprm struct according to information
295* supplied within it - refer to the explanation of linprm::flag.
296*
297* Note that this routine need not be called directly; it will be invoked by
298* linp2x() and linx2p() if the linprm::flag is anything other than a
299* predefined magic value.
300*
301* Given and returned:
302* lin struct linprm*
303* Linear transformation parameters.
304*
305* Function return value:
306* int Status return value:
307* 0: Success.
308* 1: Null linprm pointer passed.
309* 2: Memory allocation failed.
310* 3: PCi_ja matrix is singular.
311*
312* For returns > 1, a detailed error message is set in
313* linprm::err if enabled, see wcserr_enable().
314*
315*
316* linp2x() - Pixel-to-world linear transformation
317* -----------------------------------------------
318* linp2x() transforms pixel coordinates to intermediate world coordinates.
319*
320* Given and returned:
321* lin struct linprm*
322* Linear transformation parameters.
323*
324* Given:
325* ncoord,
326* nelem int The number of coordinates, each of vector length nelem
327* but containing lin.naxis coordinate elements.
328*
329* pixcrd const double[ncoord][nelem]
330* Array of pixel coordinates.
331*
332* Returned:
333* imgcrd double[ncoord][nelem]
334* Array of intermediate world coordinates.
335*
336* Function return value:
337* int Status return value:
338* 0: Success.
339* 1: Null linprm pointer passed.
340* 2: Memory allocation failed.
341* 3: PCi_ja matrix is singular.
342*
343* For returns > 1, a detailed error message is set in
344* linprm::err if enabled, see wcserr_enable().
345*
346*
347* linx2p() - World-to-pixel linear transformation
348* -----------------------------------------------
349* linx2p() transforms intermediate world coordinates to pixel coordinates.
350*
351* Given and returned:
352* lin struct linprm*
353* Linear transformation parameters.
354*
355* Given:
356* ncoord,
357* nelem int The number of coordinates, each of vector length nelem
358* but containing lin.naxis coordinate elements.
359*
360* imgcrd const double[ncoord][nelem]
361* Array of intermediate world coordinates.
362*
363* Returned:
364* pixcrd double[ncoord][nelem]
365* Array of pixel coordinates.
366*
367* int Status return value:
368* 0: Success.
369* 1: Null linprm pointer passed.
370* 2: Memory allocation failed.
371* 3: PCi_ja matrix is singular.
372*
373* For returns > 1, a detailed error message is set in
374* linprm::err if enabled, see wcserr_enable().
375*
376*
377* linwarp() - Compute measures of distortion
378* ------------------------------------------
379* linwarp() computes various measures of the distortion over a specified range
380* of pixel coordinates.
381*
382* All distortion measures are specified as an offset in pixel coordinates,
383* as given directly by prior distortions. The offset in intermediate pixel
384* coordinates given by sequent distortions is translated back to pixel
385* coordinates by applying the inverse of the linear transformation matrix
386* (PCi_ja or CDi_ja). The difference may be significant if the matrix
387* introduced a scaling.
388*
389* If all distortions are prior, then linwarp() uses diswarp(), q.v.
390*
391* Given and returned:
392* lin struct linprm*
393* Linear transformation parameters plus distortions.
394*
395* Given:
396* pixblc const double[naxis]
397* Start of the range of pixel coordinates (i.e. "bottom
398* left-hand corner" in the conventional FITS image
399* display orientation). May be specified as a NULL
400* pointer which is interpreted as (1,1,...).
401*
402* pixtrc const double[naxis]
403* End of the range of pixel coordinates (i.e. "top
404* right-hand corner" in the conventional FITS image
405* display orientation).
406*
407* pixsamp const double[naxis]
408* If positive or zero, the increment on the particular
409* axis, starting at pixblc[]. Zero is interpreted as a
410* unit increment. pixsamp may also be specified as a
411* NULL pointer which is interpreted as all zeroes, i.e.
412* unit increments on all axes.
413*
414* If negative, the grid size on the particular axis (the
415* absolute value being rounded to the nearest integer).
416* For example, if pixsamp is (-128.0,-128.0,...) then
417* each axis will be sampled at 128 points between
418* pixblc[] and pixtrc[] inclusive. Use caution when
419* using this option on non-square images.
420*
421* Returned:
422* nsamp int* The number of pixel coordinates sampled.
423*
424* Can be specified as a NULL pointer if not required.
425*
426* maxdis double[naxis]
427* For each individual distortion function, the
428* maximum absolute value of the distortion.
429*
430* Can be specified as a NULL pointer if not required.
431*
432* maxtot double* For the combination of all distortion functions, the
433* maximum absolute value of the distortion.
434*
435* Can be specified as a NULL pointer if not required.
436*
437* avgdis double[naxis]
438* For each individual distortion function, the
439* mean value of the distortion.
440*
441* Can be specified as a NULL pointer if not required.
442*
443* avgtot double* For the combination of all distortion functions, the
444* mean value of the distortion.
445*
446* Can be specified as a NULL pointer if not required.
447*
448* rmsdis double[naxis]
449* For each individual distortion function, the
450* root mean square deviation of the distortion.
451*
452* Can be specified as a NULL pointer if not required.
453*
454* rmstot double* For the combination of all distortion functions, the
455* root mean square deviation of the distortion.
456*
457* Can be specified as a NULL pointer if not required.
458*
459* Function return value:
460* int Status return value:
461* 0: Success.
462* 1: Null linprm pointer passed.
463* 2: Memory allocation failed.
464* 3: Invalid parameter.
465* 4: Distort error.
466*
467*
468* linprm struct - Linear transformation parameters
469* ------------------------------------------------
470* The linprm struct contains all of the information required to perform a
471* linear transformation. It consists of certain members that must be set by
472* the user ("given") and others that are set by the WCSLIB routines
473* ("returned").
474*
475* int flag
476* (Given and returned) This flag must be set to zero whenever any of the
477* following members of the linprm struct are set or modified:
478*
479* - linprm::naxis (q.v., not normally set by the user),
480* - linprm::pc,
481* - linprm::cdelt,
482* - linprm::dispre.
483* - linprm::disseq.
484*
485* This signals the initialization routine, linset(), to recompute the
486* returned members of the linprm struct. linset() will reset flag to
487* indicate that this has been done.
488*
489* PLEASE NOTE: flag should be set to -1 when lininit() is called for the
490* first time for a particular linprm struct in order to initialize memory
491* management. It must ONLY be used on the first initialization otherwise
492* memory leaks may result.
493*
494* int naxis
495* (Given or returned) Number of pixel and world coordinate elements.
496*
497* If lininit() is used to initialize the linprm struct (as would normally
498* be the case) then it will set naxis from the value passed to it as a
499* function argument. The user should not subsequently modify it.
500*
501* double *crpix
502* (Given) Pointer to the first element of an array of double containing
503* the coordinate reference pixel, CRPIXja.
504*
505* It is not necessary to reset the linprm struct (via linset()) when
506* linprm::crpix is changed.
507*
508* double *pc
509* (Given) Pointer to the first element of the PCi_ja (pixel coordinate)
510* transformation matrix. The expected order is
511*
512= struct linprm lin;
513= lin.pc = {PC1_1, PC1_2, PC2_1, PC2_2};
514*
515* This may be constructed conveniently from a 2-D array via
516*
517= double m[2][2] = {{PC1_1, PC1_2},
518= {PC2_1, PC2_2}};
519*
520* which is equivalent to
521*
522= double m[2][2];
523= m[0][0] = PC1_1;
524= m[0][1] = PC1_2;
525= m[1][0] = PC2_1;
526= m[1][1] = PC2_2;
527*
528* The storage order for this 2-D array is the same as for the 1-D array,
529* whence
530*
531= lin.pc = *m;
532*
533* would be legitimate.
534*
535* double *cdelt
536* (Given) Pointer to the first element of an array of double containing
537* the coordinate increments, CDELTia.
538*
539* struct disprm *dispre
540* (Given) Pointer to a disprm struct holding parameters for prior
541* distortion functions, or a null (0x0) pointer if there are none.
542*
543* Function lindist() may be used to assign a disprm pointer to a linprm
544* struct, allowing it to take control of any memory allocated for it, as
545* in the following example:
546*
547= void add_distortion(struct linprm *lin)
548= {
549= struct disprm *dispre;
550=
551= dispre = malloc(sizeof(struct disprm));
552= dispre->flag = -1;
553= lindist(1, lin, dispre, ndpmax);
554= :
555= (Set up dispre.)
556= :
557=
558= return;
559= }
560*
561* Here, after the distortion function parameters etc. are copied into
562* dispre, dispre is assigned using lindist() which takes control of the
563* allocated memory. It will be freed later when linfree() is invoked on
564* the linprm struct.
565*
566* Consider also the following erroneous code:
567*
568= void bad_code(struct linprm *lin)
569= {
570= struct disprm dispre;
571=
572= dispre.flag = -1;
573= lindist(1, lin, &dispre, ndpmax); // WRONG.
574= :
575=
576= return;
577= }
578*
579* Here, dispre is declared as a struct, rather than a pointer. When the
580* function returns, dispre will go out of scope and its memory will most
581* likely be reused, thereby trashing its contents. Later, a segfault will
582* occur when linfree() tries to free dispre's stale address.
583*
584* struct disprm *disseq
585* (Given) Pointer to a disprm struct holding parameters for sequent
586* distortion functions, or a null (0x0) pointer if there are none.
587*
588* Refer to the comments and examples given for disprm::dispre.
589*
590* double *piximg
591* (Returned) Pointer to the first element of the matrix containing the
592* product of the CDELTia diagonal matrix and the PCi_ja matrix.
593*
594* double *imgpix
595* (Returned) Pointer to the first element of the inverse of the
596* linprm::piximg matrix.
597*
598* int i_naxis
599* (Returned) The dimension of linprm::piximg and linprm::imgpix (normally
600* equal to naxis).
601*
602* int unity
603* (Returned) True if the linear transformation matrix is unity.
604*
605* int affine
606* (Returned) True if there are no distortions.
607*
608* int simple
609* (Returned) True if unity and no distortions.
610*
611* struct wcserr *err
612* (Returned) If enabled, when an error status is returned, this struct
613* contains detailed information about the error, see wcserr_enable().
614*
615* double *tmpcrd
616* (For internal use only.)
617* int m_flag
618* (For internal use only.)
619* int m_naxis
620* (For internal use only.)
621* double *m_crpix
622* (For internal use only.)
623* double *m_pc
624* (For internal use only.)
625* double *m_cdelt
626* (For internal use only.)
627* struct disprm *m_dispre
628* (For internal use only.)
629* struct disprm *m_disseq
630* (For internal use only.)
631*
632*
633* Global variable: const char *lin_errmsg[] - Status return messages
634* ------------------------------------------------------------------
635* Error messages to match the status value returned from each function.
636*
637*===========================================================================*/
638
639#ifndef WCSLIB_LIN
640#define WCSLIB_LIN
641
642#ifdef __cplusplus
643extern "C" {
644#endif
645
646
647extern const char *lin_errmsg[];
648
649 enum lin_errmsg_enum {
650 LINERR_SUCCESS = 0, // Success.
651 LINERR_NULL_POINTER = 1, // Null linprm pointer passed.
652 LINERR_MEMORY = 2, // Memory allocation failed.
653 LINERR_SINGULAR_MTX = 3, // PCi_ja matrix is singular.
654 LINERR_DISTORT_INIT = 4, // Failed to initialise distortions.
655 LINERR_DISTORT = 5, // Distort error.
656 LINERR_DEDISTORT = 6 // De-distort error.
657};
658
659 struct linprm {
660 // Initialization flag (see the prologue above).
661 //--------------------------------------------------------------------------
662 int flag; // Set to zero to force initialization.
663
664 // Parameters to be provided (see the prologue above).
665 //--------------------------------------------------------------------------
666 int naxis; // The number of axes, given by NAXIS.
667 double *crpix; // CRPIXja keywords for each pixel axis.
668 double *pc; // PCi_ja linear transformation matrix.
669 double *cdelt; // CDELTia keywords for each coord axis.
670 struct disprm *dispre; // Prior distortion parameters, if any.
671 struct disprm *disseq; // Sequent distortion parameters, if any.
672
673 // Information derived from the parameters supplied.
674 //--------------------------------------------------------------------------
675 double *piximg; // Product of CDELTia and PCi_ja matrices.
676 double *imgpix; // Inverse of the piximg matrix.
677 int i_naxis; // Dimension of piximg and imgpix.
678 int unity; // True if the PCi_ja matrix is unity.
679 int affine; // True if there are no distortions.
680 int simple; // True if unity and no distortions.
681
682 // Error handling, if enabled.
683 //--------------------------------------------------------------------------
684 struct wcserr *err;
685
686 // Private - the remainder are for internal use.
687 //--------------------------------------------------------------------------
688 double *tmpcrd;
689
690 int m_flag, m_naxis;
691 double *m_crpix, *m_pc, *m_cdelt;
692 struct disprm *m_dispre, *m_disseq;
693};
694
695// Size of the linprm struct in int units, used by the Fortran wrappers.
696#define LINLEN (sizeof(struct linprm)/sizeof(int))
697
698
699 int linini(int alloc, int naxis, struct linprm *lin);
700
701 int lininit(int alloc, int naxis, struct linprm *lin, int ndpmax);
702
703 int lindis(int sequence, struct linprm *lin, struct disprm *dis);
704
705 int lindist(int sequence, struct linprm *lin, struct disprm *dis, int ndpmax);
706
707 int lincpy(int alloc, const struct linprm *linsrc, struct linprm *lindst);
708
709 int linfree(struct linprm *lin);
710
711 int linsize(const struct linprm *lin, int sizes[2]);
712
713 int linprt(const struct linprm *lin);
714
715 int linperr(const struct linprm *lin, const char *prefix);
716
717 int linset(struct linprm *lin);
718
719 int linp2x(struct linprm *lin, int ncoord, int nelem, const double pixcrd[],
720 double imgcrd[]);
721
722 int linx2p(struct linprm *lin, int ncoord, int nelem, const double imgcrd[],
723 double pixcrd[]);
724
725 int linwarp(struct linprm *lin, const double pixblc[], const double pixtrc[],
726 const double pixsamp[], int *nsamp,
727 double maxdis[], double *maxtot,
728 double avgdis[], double *avgtot,
729 double rmsdis[], double *rmstot);
730
731 int matinv(int n, const double mat[], double inv[]);
732
733
734// Deprecated.
735#define linini_errmsg lin_errmsg
736#define lincpy_errmsg lin_errmsg
737#define linfree_errmsg lin_errmsg
738#define linprt_errmsg lin_errmsg
739#define linset_errmsg lin_errmsg
740#define linp2x_errmsg lin_errmsg
741#define linx2p_errmsg lin_errmsg
742
743#ifdef __cplusplus
744}
745#endif
746
747#endif // WCSLIB_LIN
linwarp
int linwarp(struct linprm *lin, const double pixblc[], const double pixtrc[], const double pixsamp[], int *nsamp, double maxdis[], double *maxtot, double avgdis[], double *avgtot, double rmsdis[], double *rmstot)
Compute measures of distortion.
linsize
int linsize(const struct linprm *lin, int sizes[2])
Compute the size of a linprm struct.
linx2p
int linx2p(struct linprm *lin, int ncoord, int nelem, const double imgcrd[], double pixcrd[])
World-to-pixel linear transformation.
linset
int linset(struct linprm *lin)
Setup routine for the linprm struct.
lin_errmsg_enum
lin_errmsg_enum
Definition: lin.h:649
LINERR_SUCCESS
@ LINERR_SUCCESS
Definition: lin.h:650
LINERR_MEMORY
@ LINERR_MEMORY
Definition: lin.h:652
LINERR_DEDISTORT
@ LINERR_DEDISTORT
Definition: lin.h:656
LINERR_DISTORT
@ LINERR_DISTORT
Definition: lin.h:655
LINERR_NULL_POINTER
@ LINERR_NULL_POINTER
Definition: lin.h:651
LINERR_DISTORT_INIT
@ LINERR_DISTORT_INIT
Definition: lin.h:654
LINERR_SINGULAR_MTX
@ LINERR_SINGULAR_MTX
Definition: lin.h:653
linperr
int linperr(const struct linprm *lin, const char *prefix)
Print error messages from a linprm struct.
lin_errmsg
const char * lin_errmsg[]
Status return messages.
linini
int linini(int alloc, int naxis, struct linprm *lin)
Default constructor for the linprm struct.
linprt
int linprt(const struct linprm *lin)
Print routine for the linprm struct.
lincpy
int lincpy(int alloc, const struct linprm *linsrc, struct linprm *lindst)
Copy routine for the linprm struct.
matinv
int matinv(int n, const double mat[], double inv[])
Matrix inversion.
lindist
int lindist(int sequence, struct linprm *lin, struct disprm *dis, int ndpmax)
Assign a distortion to a linprm struct.
lindis
int lindis(int sequence, struct linprm *lin, struct disprm *dis)
Assign a distortion to a linprm struct.
linp2x
int linp2x(struct linprm *lin, int ncoord, int nelem, const double pixcrd[], double imgcrd[])
Pixel-to-world linear transformation.
linfree
int linfree(struct linprm *lin)
Destructor for the linprm struct.
lininit
int lininit(int alloc, int naxis, struct linprm *lin, int ndpmax)
Default constructor for the linprm struct.
disprm
Distortion parameters.
Definition: dis.h:1093
disprm::naxis
int naxis
Definition: dis.h:1100
disprm::ndpmax
int ndpmax
Definition: dis.h:1104
disprm::maxdis
double * maxdis
Definition: dis.h:1106
linprm
Linear transformation parameters.
Definition: lin.h:659
linprm::m_crpix
double * m_crpix
Definition: lin.h:691
linprm::cdelt
double * cdelt
Definition: lin.h:669
linprm::imgpix
double * imgpix
Definition: lin.h:676
linprm::err
struct wcserr * err
Definition: lin.h:684
linprm::disseq
struct disprm * disseq
Definition: lin.h:671
linprm::crpix
double * crpix
Definition: lin.h:667
linprm::affine
int affine
Definition: lin.h:679
linprm::pc
double * pc
Definition: lin.h:668
linprm::i_naxis
int i_naxis
Definition: lin.h:677
linprm::m_cdelt
double * m_cdelt
Definition: lin.h:691
linprm::flag
int flag
Definition: lin.h:662
linprm::m_flag
int m_flag
Definition: lin.h:690
linprm::m_pc
double * m_pc
Definition: lin.h:691
linprm::dispre
struct disprm * dispre
Definition: lin.h:670
linprm::m_disseq
struct disprm * m_disseq
Definition: lin.h:692
linprm::m_dispre
struct disprm * m_dispre
Definition: lin.h:692
linprm::tmpcrd
double * tmpcrd
Definition: lin.h:688
linprm::naxis
int naxis
Definition: lin.h:666
linprm::piximg
double * piximg
Definition: lin.h:675
linprm::m_naxis
int m_naxis
Definition: lin.h:690
linprm::unity
int unity
Definition: lin.h:678
linprm::simple
int simple
Definition: lin.h:680
wcserr
Error message handling.
Definition: wcserr.h:243