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Public Types | Public Member Functions | Static Public Member Functions | Protected Member Functions | Static Protected Member Functions | Friends | List of all members
ast::PolyMap Class Reference

PolyMap is a Mapping which performs a general polynomial transformation. More...

#include <PolyMap.h>

Inheritance diagram for ast::PolyMap:
ast::Mapping ast::Object

Public Types

using ObjectPtr = std::unique_ptr< AstObject, Deleter >
 unique pointer holding an AST raw pointer More...
 

Public Member Functions

 PolyMap (ConstArray2D const &coeff_f, ConstArray2D const &coeff_i, std::string const &options="IterInverse=0")
 Construct a PolyMap with specified forward and/or inverse transforms. More...
 
 PolyMap (ConstArray2D const &coeff_f, int nout, std::string const &options="IterInverse=0")
 Construct a PolyMap with only the forward transform specified. More...
 
virtual ~PolyMap ()
 
 PolyMap (PolyMap const &)=default
 Copy constructor: make a deep copy. More...
 
 PolyMap (PolyMap &&)=default
 
PolyMapoperator= (PolyMap const &)=delete
 
PolyMapoperator= (PolyMap &&)=default
 
std::shared_ptr< PolyMapcopy () const
 Return a deep copy of this object. More...
 
bool getIterInverse () const
 Get IterInverse: does this provide an iterative inverse transformation? More...
 
int getNIterInverse () const
 Get NIterInverse: maximum number of iterations for iterative inverse. More...
 
double getTolInverse () const
 Get TolInverse: target relative error for iterative inverse. More...
 
PolyMap polyTran (bool forward, double acc, double maxacc, int maxorder, std::vector< double > const &lbnd, std::vector< double > const &ubnd) const
 This function creates a new PolyMap which is a copy of this one, in which a specified transformation (forward or inverse) has been replaced by a new polynomial transformation. More...
 
int getNIn () const
 Get NIn: the number of input axes. More...
 
int getNOut () const
 Get NOut: the number of output axes. More...
 
bool getIsSimple () const
 Get IsSimple: has the mapping been simplified? More...
 
bool isInverted () const
 Is this an inverted mapping? More...
 
bool getIsLinear () const
 Get IsLinear: is the Mapping linear? More...
 
bool getReport () const
 Get Report: report transformed coordinates to stdout? More...
 
bool hasForward () const
 Is the forward transform available? More...
 
bool hasInverse () const
 Is the inverse transform available? More...
 
std::shared_ptr< Mappinginverted () const
 Get an inverse mapping. More...
 
Array2D linearApprox (PointD const &lbnd, PointD const &ubnd, double tol) const
 Compute a linear approximation to the forward transformation. More...
 
SeriesMap then (Mapping const &next) const
 Return a series compound mapping this(first(input)) containing shallow copies of the original. More...
 
ParallelMap under (Mapping const &next) const
 Return a parallel compound mapping containing shallow copies of the original. More...
 
double rate (PointD const &at, int ax1, int ax2) const
 Evaluate the rate of change of the Mapping with respect to a specified input, at a specified position. More...
 
void setReport (bool report)
 Set Report: report transformed coordinates to stdout? More...
 
std::shared_ptr< Mappingsimplified () const
 Return a simplied version of the mapping (which may be a compound Mapping such as a CmpMap). More...
 
void applyForward (ConstArray2D const &from, Array2D const &to) const
 Perform a forward transformation on 2-D array, putting the results into a pre-allocated 2-D array. More...
 
Array2D applyForward (ConstArray2D const &from) const
 Perform a forward transformation on a 2-D array, returning the results as a new array. More...
 
std::vector< double > applyForward (std::vector< double > const &from) const
 Perform a forward transformation on a vector, returning the results as a new vector. More...
 
void applyInverse (ConstArray2D const &from, Array2D const &to) const
 Perform an inverse transformation on a 2-D array, putting the results into a pre-allocated 2-D array. More...
 
Array2D applyInverse (ConstArray2D const &from) const
 Perform an inverse transformation on a 2-D array, returning the results as a new 2-D array. More...
 
std::vector< double > applyInverse (std::vector< double > const &from) const
 Perform an inverse transformation on a vector, returning the results as a new vector. More...
 
void tranGridForward (PointI const &lbnd, PointI const &ubnd, double tol, int maxpix, Array2D const &to) const
 Transform a grid of points in the forward direction. More...
 
Array2D tranGridForward (PointI const &lbnd, PointI const &ubnd, double tol, int maxpix, int nPts) const
 Transform a grid of points in the inverse direction, returning the results as a new Array2D. More...
 
void tranGridInverse (PointI const &lbnd, PointI const &ubnd, double tol, int maxpix, Array2D const &to) const
 Transform a grid of points in the inverse direction. More...
 
Array2D tranGridInverse (PointI const &lbnd, PointI const &ubnd, double tol, int maxpix, int nPts) const
 Transform a grid of points in the inverse direction. More...
 
bool operator== (Object const &rhs) const
 Return True if this and rhs are the equal. More...
 
bool operator!= (Object const &rhs) const
 Return True if this and rhs are not equal. More...
 
void clear (std::string const &attrib)
 Clear the values of a specified set of attributes for an Object. More...
 
bool hasAttribute (std::string const &attrib) const
 Does this object have an attribute with the specified name? More...
 
std::string getClassName () const
 Get Class: the name of the class (e.g. More...
 
std::string getID () const
 Get ID: object identification string that is not copied. More...
 
std::string getIdent () const
 Get Ident: object identification string that is copied. More...
 
int getNObject () const
 Get NObject: number of AST objects in existence of the same type as the underlying AST class. More...
 
int getObjSize () const
 Get ObjSize: the in-memory size of the AST object in bytes. More...
 
int getRefCount () const
 Get RefCount: number of active pointers to the underlying AST object. More...
 
bool getUseDefs () const
 Get UseDefs: allow use of default values for Object attributes? More...
 
void lock (bool wait)
 Lock this object for exclusive use by the calling thread. More...
 
bool same (Object const &other) const
 Does this contain the same AST object as another? More...
 
void setID (std::string const &id)
 Set ID: object identification string that is not copied. More...
 
void setIdent (std::string const &ident)
 Set Ident: object identification string that is copied. More...
 
void setUseDefs (bool usedefs)
 Set UseDefs: allow use of default values for Object attributes? More...
 
void show (std::ostream &os, bool showComments=true) const
 Print a textual description the object to an ostream. More...
 
std::string show (bool showComments=true) const
 Return a textual description the object as a string. More...
 
bool test (std::string const &attrib) const
 Has this attribute been explicitly set (and not subsequently cleared)? More...
 
void unlock (bool report=false)
 Unlock this object previously locked using lock, so that other threads can use this object. More...
 

Static Public Member Functions

static std::shared_ptr< ObjectfromString (std::string const &str)
 Construct an Object from a string, using astFromString. More...
 
template<typename Class >
static std::shared_ptr< Class > fromAstObject (AstObject *rawObj, bool copy)
 Given a bare AST object pointer return a shared pointer to an ast::Object of the correct type. More...
 

Protected Member Functions

virtual std::shared_ptr< ObjectcopyPolymorphic () const override
 Return a deep copy of this object. More...
 
 PolyMap (AstPolyMap *map)
 Construct a PolyMap from an raw AST pointer. More...
 
template<typename Class >
std::shared_ptr< Class > decompose (int i, bool copy) const
 Return a deep copy of one of the two component mappings. More...
 
template<typename T , typename AstT >
std::shared_ptr< T > copyImpl () const
 Implementation of deep copy. More...
 
bool getB (std::string const &attrib) const
 Get the value of an attribute as a bool. More...
 
std::string const getC (std::string const &attrib) const
 Get the value of an attribute as a string. More...
 
double getD (std::string const &attrib) const
 Get the value of an attribute as a double. More...
 
float getF (std::string const &attrib) const
 Get the value of an attribute as a float. More...
 
int getI (std::string const &attrib) const
 Get the value of an attribute as an int. More...
 
long int getL (std::string const &attrib) const
 Get the value of an attribute as a long int. More...
 
void set (std::string const &setting)
 Assign a set of attribute values, over-riding any previous values. More...
 
void setB (std::string const &attrib, bool value)
 Set the value of an attribute as a bool. More...
 
void setC (std::string const &attrib, std::string const &value)
 Set the value of an attribute as a string. More...
 
void setD (std::string const &attrib, double value)
 Set the value of an attribute as a double. More...
 
void setF (std::string const &attrib, float value)
 Set the value of an attribute as a float. More...
 
void setI (std::string const &attrib, int value)
 Set the value of an attribute as an int. More...
 
void setL (std::string const &attrib, long int value)
 Set the value of an attribute as a long int. More...
 

Static Protected Member Functions

template<typename ShimT , typename AstT >
static std::shared_ptr< ShimT > makeShim (AstObject *p)
 Functor to make an astshim instance from a raw AST pointer of the corresponding type. More...
 

Friends

class Object
 

Detailed Description

PolyMap is a Mapping which performs a general polynomial transformation.

Each output coordinate is a polynomial function of all the input coordinates. The coefficients are specified separately for each output coordinate. The forward and inverse transformations are defined independantly by separate sets of coefficients. If no inverse transformation is supplied, an iterative method can be used to evaluate the inverse based only on the forward transformation.

Attributes

All those of Mapping plus:

Definition at line 49 of file PolyMap.h.

Member Typedef Documentation

◆ ObjectPtr

using ast::Object::ObjectPtr = std::unique_ptr<AstObject, Deleter>
inherited

unique pointer holding an AST raw pointer

Definition at line 59 of file Object.h.

Constructor & Destructor Documentation

◆ PolyMap() [1/5]

ast::PolyMap::PolyMap ( ConstArray2D const &  coeff_f,
ConstArray2D const &  coeff_i,
std::string const &  options = "IterInverse=0" 
)
inlineexplicit

Construct a PolyMap with specified forward and/or inverse transforms.

The two sets of coefficients are independent of each other: the inverse transform need not undo the forward transform.

Parameters
[in]coeff_fA matrix of coefficients describing the forward transformation. If coeff_f is empty then no forward transformation is provided.
[in]coeff_iA matrix of coefficients describing the inverse transformation. If coeff_i is empty then no inverse transformation is provided, unless you specify suitable options to request an iterative inverse; see the other constructor for details.
[in]optionsComma-separated list of attribute assignments.
Exceptions
std::invalid_argumentif neither transform is specified (coeff_f and coeff_i are both empty)

Coefficient Matrices

The coefficients describing a forward transformation are specified as 2-dimensional ndarray, with one row per coefficient. Each row contains the following consecutive (2 + nin) values:

  • The first element is the coefficient value.
  • The next element is the integer index of the PolyMap output which uses the coefficient within its defining polynomial (the first output has index 1).
  • The remaining elements give the integer power to use with each corresponding input coordinate value, or 0 to ignore that input coordinate. Powers must not be negative and floating point values are rounded to the nearest integer.

For example, suppose you want to make a PolyMap with 3 inputs and 2 outputs. Then each row of coeff_f must have 5 = 2 + nin elements. A row with values (1.2, 2, 6, 3, 0) describes a coefficient that increments output 2 as follows:

`out2 += 1.2 * in1^6 * in2^3 * in3^0`

and a row with values (-1.5, 1, 0, 0, 0) describes a coefficient that increments output 2 with a constant value of -1.5 (since all powers are 0):

`out1 += -1.5 * in1^0 * in2^0 * in3^0`

The final value of each output coordinate is the sum of all values specified by coefficients which increment that output coordinate, or 0 if there are no such coefficients.

The coefficients describing the inverse transformation work the same way, of course, but each coefficient is described by (2 + nout) values.

Definition at line 99 of file PolyMap.h.

101  : Mapping(reinterpret_cast<AstMapping *>(_makeRawPolyMap(coeff_f, coeff_i, options))) {}

◆ PolyMap() [2/5]

ast::PolyMap::PolyMap ( ConstArray2D const &  coeff_f,
int  nout,
std::string const &  options = "IterInverse=0" 
)
inlineexplicit

Construct a PolyMap with only the forward transform specified.

If the polynomial is invertible and you want an inverse you have two choices: either specify suitable options to request an iterative inverse, or call polyTran to fit an inverse. Both have advantages:

  • The iterative inverse should provide valid values even if multiple choices exist, and nan if no valid choice exists, whereas polyTran will raise an exception if a single-valued inverse cannot be found over the specified range.
  • The iterative inverse has no range restriction, whereas polyTran produces an inverse that is valid over a specified range.
  • The polyTran inverse is more efficient to compute.
Parameters
[in]coeff_fA (2 + nin) x ncoeff_f matrix of coefficients describing the forward transformation. If coeff_f is empty then no forward transformation is provided.
[in]noutNumber of output coordinates.
[in]optionsComma-separated list of attribute assignments. Useful attributes include: IterInverse, NIterInverse and TolInverse.
Exceptions
std::invalid_argumentif the forward transform is not specified (coeff_f is empty)

Definition at line 126 of file PolyMap.h.

127  : Mapping(reinterpret_cast<AstMapping *>(_makeRawPolyMap(coeff_f, nout, options))) {}

◆ ~PolyMap()

virtual ast::PolyMap::~PolyMap ( )
inlinevirtual

Definition at line 129 of file PolyMap.h.

129 {}

◆ PolyMap() [3/5]

ast::PolyMap::PolyMap ( PolyMap const &  )
default

Copy constructor: make a deep copy.

◆ PolyMap() [4/5]

ast::PolyMap::PolyMap ( PolyMap &&  )
default

◆ PolyMap() [5/5]

ast::PolyMap::PolyMap ( AstPolyMap *  map)
protected

Construct a PolyMap from an raw AST pointer.

Definition at line 50 of file PolyMap.cc.

50  : Mapping(reinterpret_cast<AstMapping *>(map)) {
51  if (!astIsAPolyMap(getRawPtr())) {
53  os << "this is a " << getClassName() << ", which is not a PolyMap";
54  throw std::invalid_argument(os.str());
55  }
56 }

Member Function Documentation

◆ applyForward() [1/3]

Array2D ast::Mapping::applyForward ( ConstArray2D const &  from) const
inlineinherited

Perform a forward transformation on a 2-D array, returning the results as a new array.

Parameters
[in]frominput coordinates, with dimensions (nPts, nIn)
Returns
the results as a new array with dimensions (nPts, nOut)

Definition at line 268 of file Mapping.h.

268  {
269  Array2D to = ndarray::allocate(getNOut(), from.getSize<1>());
270  _tran(from, true, to);
271  return to;
272  }

◆ applyForward() [2/3]

void ast::Mapping::applyForward ( ConstArray2D const &  from,
Array2D const &  to 
) const
inlineinherited

Perform a forward transformation on 2-D array, putting the results into a pre-allocated 2-D array.

Parameters
[in]frominput coordinates, with dimensions (nPts, nIn)
[out]totransformed coordinates, with dimensions (nPts, nOut)

Definition at line 260 of file Mapping.h.

260 { _tran(from, true, to); }

◆ applyForward() [3/3]

std::vector<double> ast::Mapping::applyForward ( std::vector< double > const &  from) const
inlineinherited

Perform a forward transformation on a vector, returning the results as a new vector.

Parameters
[in]frominput coordinates as a vector, with axes adjacent, e.g. x0, y0, x1, y1...xn, yn
Returns
the results as a new vector

Definition at line 280 of file Mapping.h.

280  {
281  auto fromArr = arrayFromVector(from, getNIn());
282  std::vector<double> to(fromArr.getSize<1>() * getNOut());
283  auto toArr = arrayFromVector(to, getNOut());
284  _tran(fromArr, true, toArr);
285  return to;
286  }

◆ applyInverse() [1/3]

Array2D ast::Mapping::applyInverse ( ConstArray2D const &  from) const
inlineinherited

Perform an inverse transformation on a 2-D array, returning the results as a new 2-D array.

Parameters
[in]fromoutput coordinates, with dimensions (nPts, nOut)
Returns
the results as a new array with dimensions (nPts, nIn)

Definition at line 302 of file Mapping.h.

302  {
303  Array2D to = ndarray::allocate(getNIn(), from.getSize<1>());
304  _tran(from, false, to);
305  return to;
306  }

◆ applyInverse() [2/3]

void ast::Mapping::applyInverse ( ConstArray2D const &  from,
Array2D const &  to 
) const
inlineinherited

Perform an inverse transformation on a 2-D array, putting the results into a pre-allocated 2-D array.

Parameters
[in]frominput coordinates, with dimensions (nPts, nOut)
[out]totransformed coordinates, with dimensions (nPts, nIn)

Definition at line 294 of file Mapping.h.

294 { _tran(from, false, to); }

◆ applyInverse() [3/3]

std::vector<double> ast::Mapping::applyInverse ( std::vector< double > const &  from) const
inlineinherited

Perform an inverse transformation on a vector, returning the results as a new vector.

Parameters
[in]frominput coordinates as a vector, with axes adjacent, e.g. x0, y0, x1, y1...xn, yn
Returns
the results as a new vector

Definition at line 314 of file Mapping.h.

314  {
315  auto fromArr = arrayFromVector(from, getNOut());
316  std::vector<double> to(fromArr.getSize<1>() * getNIn());
317  auto toArr = arrayFromVector(to, getNIn());
318  _tran(fromArr, false, toArr);
319  return to;
320  }

◆ clear()

void ast::Object::clear ( std::string const &  attrib)
inlineinherited

Clear the values of a specified set of attributes for an Object.

Clearing an attribute cancels any value that has previously been explicitly set for it, so that the standard default attribute value will subsequently be used instead. This also causes the astTest function to return the value zero for the attribute, indicating that no value has been set.

Definition at line 119 of file Object.h.

119  {
120  astClear(getRawPtr(), attrib.c_str());
121  assertOK();
122  }

◆ copy()

std::shared_ptr<PolyMap> ast::PolyMap::copy ( ) const
inline

Return a deep copy of this object.

Definition at line 138 of file PolyMap.h.

138 { return std::static_pointer_cast<PolyMap>(copyPolymorphic()); }

◆ copyImpl()

template<typename T , typename AstT >
std::shared_ptr<T> ast::Object::copyImpl ( ) const
inlineprotectedinherited

Implementation of deep copy.

Should be called to implement copyPolymorphic by all derived classes.

Definition at line 320 of file Object.h.

320  {
321  auto *rawptr = reinterpret_cast<AstT *>(astCopy(getRawPtr()));
322  auto retptr = std::shared_ptr<T>(new T(rawptr));
323  assertOK();
324  return retptr;
325  }

◆ copyPolymorphic()

virtual std::shared_ptr<Object> ast::PolyMap::copyPolymorphic ( ) const
inlineoverrideprotectedvirtual

Return a deep copy of this object.

This is called by copy.

Each subclass must override this method. The standard implementation is:

return copyImpl<astshim_class, ast_class>();

for example Frame implements this as:

return copyImpl<Frame, AstFrame>();

Reimplemented from ast::Mapping.

Definition at line 236 of file PolyMap.h.

236  {
237  return copyImpl<PolyMap, AstPolyMap>();
238  }

◆ decompose()

template<typename Class >
template std::shared_ptr< Mapping > ast::Mapping::decompose ( int  i,
bool  copy 
) const
protectedinherited

Return a deep copy of one of the two component mappings.

This is intended to be exposed by classes that need it (e.g. CmpMap, CmpFrame and TranMap) as operator[].

Template Parameters
Classastshim class of returned object, typically Mapping or Frame.
Parameters
[in]iIndex: 0 for the first mapping, 1 for the second
[in]copyIf true make a deep copy, else a shallow copy
Exceptions
std::invalid_argumentif i is not 0 or 1.
std::runtime_errorif this mapping is not a compound mapping.

Definition at line 64 of file Mapping.cc.

64  {
65  if ((i < 0) || (i > 1)) {
67  os << "i =" << i << "; must be 0 or 1";
68  throw std::invalid_argument(os.str());
69  }
70  // Report pre-existing problems now so our later test for "not a compound object" is accurate
71  assertOK();
72 
73  AstMapping *rawMap1;
74  AstMapping *rawMap2;
75  int series, invert1, invert2;
76  astDecompose(getRawPtr(), &rawMap1, &rawMap2, &series, &invert1, &invert2);
77  assertOK();
78 
79  if (!rawMap2) {
80  // Not a compound object; free rawMap1 (rawMap2 is null, so no need to free it) and throw an exception
81  astAnnul(reinterpret_cast<AstObject *>(rawMap1));
83  os << "This " << getClassName() << " is not a compound object";
84  throw std::runtime_error(os.str());
85  }
86 
87  // Make a deep copy of the returned object and free the shallow copies
88  AstMapping *retRawMap;
89  int invert;
90  if (i == 0) {
91  retRawMap = reinterpret_cast<AstMapping *>(astCopy(reinterpret_cast<AstObject *>(rawMap1)));
92  invert = invert1;
93  } else {
94  retRawMap = reinterpret_cast<AstMapping *>(astCopy(reinterpret_cast<AstObject *>(rawMap2)));
95  invert = invert2;
96  }
97  astAnnul(reinterpret_cast<AstObject *>(rawMap1));
98  astAnnul(reinterpret_cast<AstObject *>(rawMap2));
99  assertOK();
100 
101  // If the mapping's internal invert flag does not match the value used when the CmpMap was made
102  // then invert the mapping. Note that it is not possible to create such objects in astshim
103  // but it is possible to read in objects created by other software.
104  if (invert != astGetI(retRawMap, "Invert")) {
105  astInvert(retRawMap);
106  assertOK();
107  }
108 
109  return Object::fromAstObject<Class>(reinterpret_cast<AstObject *>(retRawMap), copy);
110 }

◆ fromAstObject()

template<typename Class >
template std::shared_ptr< Object > ast::Object::fromAstObject< Object > ( AstObject *  rawObj,
bool  copy 
)
staticinherited

Given a bare AST object pointer return a shared pointer to an ast::Object of the correct type.

The returned object takes ownership of the pointer. This is almost always what you want, for instance astDecompose returns shallow copies of the internal pointers.

Template Parameters
ClassThe class of the returned shared pointer. (The actual class will be the correct class of rawPtr.)
Parameters
[in]rawObjA bare AST object pointer
[in]copyIf True then make a deep copy of the pointer (and free the original)

Definition at line 138 of file Object.cc.

138  {
139  AstObject *rawObjCopy = rawObj;
140  if (copy) {
141  rawObjCopy = reinterpret_cast<AstObject *>(astCopy(rawObj));
142  astAnnul(rawObj);
143  }
144  assertOK(rawObjCopy);
145 
146  // Make the appropriate ast shim object and dynamically cast to the desired output type
147  auto retObjectBeforeCast = Object::_basicFromAstObject(rawObjCopy);
148  auto retObject = std::dynamic_pointer_cast<Class>(retObjectBeforeCast);
149  if (!retObject) {
151  os << "The component is of type " << retObject->getClassName()
152  << ", which could not be cast to the desired type " << typeid(Class).name();
153  throw std::runtime_error(os.str());
154  }
155  return retObject;
156 }

◆ fromString()

static std::shared_ptr<Object> ast::Object::fromString ( std::string const &  str)
inlinestaticinherited

Construct an Object from a string, using astFromString.

Definition at line 88 of file Object.h.

88  {
89  auto *rawPtr = reinterpret_cast<AstObject *>(astFromString(str.c_str()));
90  assertOK(rawPtr);
91  return Object::_basicFromAstObject(rawPtr);
92  }

◆ getB()

bool ast::Object::getB ( std::string const &  attrib) const
inlineprotectedinherited

Get the value of an attribute as a bool.

If possible, the attribute value is converted to the type you request.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 348 of file Object.h.

348  {
349  bool val = astGetI(getRawPtr(), attrib.c_str());
350  assertOK();
351  return val;
352  }

◆ getC()

std::string const ast::Object::getC ( std::string const &  attrib) const
inlineprotectedinherited

Get the value of an attribute as a string.

If possible, the attribute value is converted to the type you request.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 361 of file Object.h.

361  {
362  char const *rawval = astGetC(getRawPtr(), attrib.c_str());
363  assertOK();
364  return std::string(rawval);
365  }

◆ getClassName()

std::string ast::Object::getClassName ( ) const
inlineinherited

Get Class: the name of the class (e.g.

ZoomMap)

Note: if AST returns "CmpMap" then the name will be changed to "SeriesMap" or "ParallelMap", as appropriate.

Definition at line 139 of file Object.h.

139 { return detail::getClassName(getRawPtr()); }

◆ getD()

double ast::Object::getD ( std::string const &  attrib) const
inlineprotectedinherited

Get the value of an attribute as a double.

If possible, the attribute value is converted to the type you request.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 374 of file Object.h.

374  {
375  double val = astGetD(getRawPtr(), attrib.c_str());
376  assertOK();
377  return val;
378  }

◆ getF()

float ast::Object::getF ( std::string const &  attrib) const
inlineprotectedinherited

Get the value of an attribute as a float.

If possible, the attribute value is converted to the type you request.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 387 of file Object.h.

387  {
388  float val = astGetF(getRawPtr(), attrib.c_str());
389  assertOK();
390  return val;
391  }

◆ getI()

int ast::Object::getI ( std::string const &  attrib) const
inlineprotectedinherited

Get the value of an attribute as an int.

If possible, the attribute value is converted to the type you request.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 400 of file Object.h.

400  {
401  int val = astGetI(getRawPtr(), attrib.c_str());
402  assertOK();
403  return val;
404  }

◆ getID()

std::string ast::Object::getID ( ) const
inlineinherited

Get ID: object identification string that is not copied.

Definition at line 142 of file Object.h.

142 { return getC("ID"); }

◆ getIdent()

std::string ast::Object::getIdent ( ) const
inlineinherited

Get Ident: object identification string that is copied.

Definition at line 145 of file Object.h.

145 { return getC("Ident"); }

◆ getIsLinear()

bool ast::Mapping::getIsLinear ( ) const
inlineinherited

Get IsLinear: is the Mapping linear?

Definition at line 100 of file Mapping.h.

100 { return getB("IsLinear"); }

◆ getIsSimple()

bool ast::Mapping::getIsSimple ( ) const
inlineinherited

Get IsSimple: has the mapping been simplified?

Definition at line 87 of file Mapping.h.

87 { return getI("IsSimple"); }

◆ getIterInverse()

bool ast::PolyMap::getIterInverse ( ) const
inline

Get IterInverse: does this provide an iterative inverse transformation?

Definition at line 141 of file PolyMap.h.

141 { return getB("IterInverse"); }

◆ getL()

long int ast::Object::getL ( std::string const &  attrib) const
inlineprotectedinherited

Get the value of an attribute as a long int.

If possible, the attribute value is converted to the type you request.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 413 of file Object.h.

413  {
414  long int val = astGetL(getRawPtr(), attrib.c_str());
415  assertOK();
416  return val;
417  }

◆ getNIn()

int ast::Mapping::getNIn ( ) const
inlineinherited

Get NIn: the number of input axes.

Definition at line 77 of file Mapping.h.

77 { return getI("NIn"); }

◆ getNIterInverse()

int ast::PolyMap::getNIterInverse ( ) const
inline

Get NIterInverse: maximum number of iterations for iterative inverse.

Definition at line 144 of file PolyMap.h.

144 { return getI("NIterInverse"); }

◆ getNObject()

int ast::Object::getNObject ( ) const
inlineinherited

Get NObject: number of AST objects in existence of the same type as the underlying AST class.

Warning
Intended only for debugging astshim.

Definition at line 153 of file Object.h.

153 { return getI("NObject"); }

◆ getNOut()

int ast::Mapping::getNOut ( ) const
inlineinherited

Get NOut: the number of output axes.

Definition at line 82 of file Mapping.h.

82 { return getI("NOut"); }

◆ getObjSize()

int ast::Object::getObjSize ( ) const
inlineinherited

Get ObjSize: the in-memory size of the AST object in bytes.

Definition at line 156 of file Object.h.

156 { return getI("ObjSize"); }

◆ getRawPtr() [1/2]

AstObject* ast::Object::getRawPtr ( )
inlineinherited

Get the raw AST pointer.

Intended for internal use only, but cannot be made protected without endless "friend class" declarations.

Definition at line 294 of file Object.h.

294 { return &*_objPtr; };

◆ getRawPtr() [2/2]

AstObject const* ast::Object::getRawPtr ( ) const
inlineinherited

Get the raw AST pointer.

Intended for internal use only, but cannot be made protected without endless "friend class" declarations.

Definition at line 292 of file Object.h.

292 { return &*_objPtr; };

◆ getRefCount()

int ast::Object::getRefCount ( ) const
inlineinherited

Get RefCount: number of active pointers to the underlying AST object.

Warning
Intended only for debugging astshim.

Definition at line 163 of file Object.h.

163 { return getI("RefCount"); }

◆ getReport()

bool ast::Mapping::getReport ( ) const
inlineinherited

Get Report: report transformed coordinates to stdout?

Definition at line 105 of file Mapping.h.

105 { return getB("Report"); }

◆ getTolInverse()

double ast::PolyMap::getTolInverse ( ) const
inline

Get TolInverse: target relative error for iterative inverse.

Definition at line 147 of file PolyMap.h.

147 { return getD("TolInverse"); }

◆ getUseDefs()

bool ast::Object::getUseDefs ( ) const
inlineinherited

Get UseDefs: allow use of default values for Object attributes?

Definition at line 166 of file Object.h.

166 { return getB("UseDefs"); }

◆ hasAttribute()

bool ast::Object::hasAttribute ( std::string const &  attrib) const
inlineinherited

Does this object have an attribute with the specified name?

Definition at line 127 of file Object.h.

127  {
128  bool ret = astHasAttribute(getRawPtr(), attrib.c_str());
129  assertOK();
130  return ret;
131  }

◆ hasForward()

bool ast::Mapping::hasForward ( ) const
inlineinherited

Is the forward transform available?

Note
This gets the TranForward attribute, but is named hasForward instead of getTranForward for clarity, since it does not return a transform.

Definition at line 114 of file Mapping.h.

114 { return getB("TranForward"); }

◆ hasInverse()

bool ast::Mapping::hasInverse ( ) const
inlineinherited

Is the inverse transform available?

Note
This gets the TranInverse attribute, but is named hasInverse instead of getTranInverse for clarity, since it does not return a transform.

Definition at line 123 of file Mapping.h.

123 { return getB("TranInverse"); }

◆ inverted()

std::shared_ptr< Mapping > ast::Mapping::inverted ( ) const
inherited

Get an inverse mapping.

An inverse mapping is a deep copy of a mapping whose Invert attribute has been toggled, as indicated by isInverted. This swaps the meaning of "input" and "output", and of "forward" and "inverse". Thus it swaps the behavior of applyForward and applyInverse, getNIn and getNOut, hasForward and hasInverse and so on.

Note that the inverse mapping contains exactly the same model coefficients as the original, but they are used by applyInverse instead of applyForward. Thus for example if a ZoomMap has a zoom factor of 4.0 then its inverse also reports a zoom factor of 4.0 (despite behaving like an uninverted ZoomMap with zoom factor of 0.25).

Definition at line 41 of file Mapping.cc.

41  {
42  auto rawCopy = reinterpret_cast<AstMapping *>(astCopy(getRawPtr()));
43  astInvert(rawCopy);
44  assertOK(reinterpret_cast<AstObject *>(rawCopy));
45  // use false because the pointer has already been copied
46  return Object::fromAstObject<Mapping>(reinterpret_cast<AstObject *>(rawCopy), false);
47 }

◆ isInverted()

bool ast::Mapping::isInverted ( ) const
inlineinherited

Is this an inverted mapping?

Note: this gets the Invert attribute. This method is not called getInvert because that sounds like it might return the inverse.

Definition at line 95 of file Mapping.h.

95 { return getB("Invert"); }

◆ linearApprox()

Array2D ast::Mapping::linearApprox ( PointD const &  lbnd,
PointD const &  ubnd,
double  tol 
) const
inherited

Compute a linear approximation to the forward transformation.

Parameters
[in]lbndInput point defining the lower bounds of the box over which the linear approximation is computed.
[in]ubndInput point defining the upper bounds of the box over which the linear approximation is computed.
[in]tolThe maximum permitted deviation from linearity, expressed as apositive Cartesian displacement in the output coordinate space. If a linear fit to the forward transformation of the Mapping deviates from the true transformation by more than this amount at any point which is tested, then raise an exception.
Returns
The co-efficients of the linear approximation to the specified transformation, as an 1 + nIn x nOut array. The first index is [constant, gradiant for input 1, gradiant for input 2...] and the second index is [output 1, output 2, ...]. For example, if the Mapping has 2 inputs and 3 outputs then the coefficients are:
X_out = fit[0, 0] + fit[1, 0] X_in + fit[2, 0] Y_in
Y_out = fit[0, 1] + fit[1, 1] X_in + fit[2, 1] Y_in
Z_out = fit[0, 2] + fit[1, 2] X_in + fit[2, 2] Y_in
Exceptions
std::runtime_errorif the forward transformation cannot be modeled to within the specified tol.

Definition at line 49 of file Mapping.cc.

49  {
50  int const nIn = getNIn();
51  int const nOut = getNOut();
52  detail::assertEqual(lbnd.size(), "lbnd.size", static_cast<std::size_t>(nIn), "nIn");
53  detail::assertEqual(ubnd.size(), "ubnd.size", static_cast<std::size_t>(nIn), "nIn");
54  Array2D fit = ndarray::allocate(ndarray::makeVector(1 + nIn, nOut));
55  int isOK = astLinearApprox(getRawPtr(), lbnd.data(), ubnd.data(), tol, fit.getData());
56  assertOK();
57  if (!isOK) {
58  throw std::runtime_error("Mapping not sufficiently linear");
59  }
60  return fit;
61 }

◆ lock()

void ast::Object::lock ( bool  wait)
inlineinherited

Lock this object for exclusive use by the calling thread.

The thread-safe public interface to AST is designed so that an error is reported if any thread attempts to use an Object that it has not previously locked for its own exclusive use using this function. When an Object is created, it is initially locked by the thread that creates it, so newly created objects do not need to be explicitly locked. However, if an Object pointer is passed to another thread, the original thread must first unlock it (using astUnlock) and the new thread must then lock it (using astLock) before the new thread can use the Object.

Parameters
[in]waitIf the Object is curently locked by another thread then this function will either report an error or block. If a non-zero value is supplied for "wait", the calling thread waits until the object is available for it to use. Otherwise, an error is reported and the function returns immediately without locking the Object.

Notes

  • The Locked object will belong to the current AST context.
  • This function returns without action if the Object is already locked by the calling thread.
  • If simultaneous use of the same object is required by two or more threads, Object::copy should be used to to produce a deep copy of the Object for each thread. Each copy should then be unlocked by the parent thread (i.e. the thread that created the copy), and then locked by the child thread (i.e. the thread that wants to use the copy).
  • This function returns without action if the AST library has been built without POSIX thread support (i.e. the "-with-pthreads" option was not specified when running the "configure" script).

Definition at line 202 of file Object.h.

202  {
203  astLock(getRawPtr(), static_cast<int>(wait));
204  assertOK();
205  }

◆ makeShim()

template<typename ShimT , typename AstT >
static std::shared_ptr<ShimT> ast::Object::makeShim ( AstObject *  p)
inlinestaticprotectedinherited

Functor to make an astshim instance from a raw AST pointer of the corresponding type.

Template Parameters
ShimTOutput astshim class
AstTOutput AST class

Definition at line 310 of file Object.h.

310  {
311  return std::shared_ptr<ShimT>(new ShimT(reinterpret_cast<AstT *>(p)));
312  }

◆ operator!=()

bool ast::Object::operator!= ( Object const &  rhs) const
inlineinherited

Return True if this and rhs are not equal.

See operator== for details

Definition at line 82 of file Object.h.

82  {
83  return !(*this == rhs); };

◆ operator=() [1/2]

PolyMap& ast::PolyMap::operator= ( PolyMap &&  )
default

◆ operator=() [2/2]

PolyMap& ast::PolyMap::operator= ( PolyMap const &  )
delete

◆ operator==()

bool ast::Object::operator== ( Object const &  rhs) const
inherited

Return True if this and rhs are the equal.

For two objects be equal, they both must have the same attributes and all contained objects must be equal.

Definition at line 85 of file Object.cc.

85  {
86  auto thisStr = this->show(false);
87  auto rhsStr = rhs.show(false);
88  return rhsStr == thisStr;
89 }

◆ polyTran()

PolyMap ast::PolyMap::polyTran ( bool  forward,
double  acc,
double  maxacc,
int  maxorder,
std::vector< double > const &  lbnd,
std::vector< double > const &  ubnd 
) const

This function creates a new PolyMap which is a copy of this one, in which a specified transformation (forward or inverse) has been replaced by a new polynomial transformation.

The coefficients of the new transformation are estimated by sampling the other transformation and performing a least squares polynomial fit in the opposite direction to the sampled positions and values.

IterInverse will be cleared in the returned mapping if the inverse was fit by polyTran.

This method can only be used on (1-input,1-output) or (2-input, 2-output) PolyMaps.

The transformation to create is specified by the forward parameter. In what follows "X" refers to the inputs of the PolyMap, and "Y" to the outputs of the PolyMap. The forward transformation transforms input values (X) into output values (Y), and the inverse transformation transforms output values (Y) into input values (X). Within a PolyMap, each transformation is represented by an independent set of polynomials, P_f or P_i: Y=P_f(X) for the forward transformation and X=P_i(Y) for the inverse transformation.

The forward parameter specifies the transformation to be replaced. If it is true, a new forward transformation is created by first finding the input values (X) using the inverse transformation (which must be available) at a regular grid of points (Y) covering a rectangular region of the PolyMap's output space. The coefficients of the required forward polynomial, Y=P_f(X), are chosen in order to minimise the sum of the squared residuals between the sampled values of Y and P_f(X).

If forward is false (probably the most likely case), a new inverse transformation is created by first finding the output values (Y) using the forward transformation (which must be available) at a regular grid of points (X) covering a rectangular region of the PolyMap's input space. The coefficients of the required inverse polynomial, X=P_i(Y), are chosen in order to minimise the sum of the squared residuals between the sampled values of X and P_i(Y).

This fitting process is performed repeatedly with increasing polynomial orders (starting with linear) until the target accuracy is achieved, or a specified maximum order is reached. If the target accuracy cannot be achieved even with this maximum-order polynomial, the best fitting maximum-order polynomial is returned so long as its accuracy is better than "maxacc". If it is not, an error is reported.

Parameters
[in]forwardIf true the forward transformation is replaced. Otherwise the inverse transformation is replaced.
[in]accThe target accuracy, expressed as a geodesic distance within the PolyMap's input space (if forward is false) or output space (if forward is true).
[in]maxaccThe maximum allowed accuracy for an acceptable polynomial, expressed as a geodesic distance within the PolyMap's input space (if forward is false) or output space (if forward is true).
[in]maxorderThe maximum allowed polynomial order. This is one more than the maximum power of either input axis. So for instance, a value of 3 refers to a quadratic polynomial. Note, cross terms with total powers greater than or equal to maxorder are not inlcuded in the fit. So the maximum number of terms in each of the fitted polynomials is maxorder*(maxorder + 1)/2.
[in]lbndA vector holding the lower bounds of a rectangular region within the PolyMap's input space (if forward is false) or output space (if forward is true). The new polynomial will be evaluated over this rectangle. The length should equal getNIn() or getNOut(), depending on forward.
[in]ubndA vector holding the upper bounds of a rectangular region within the PolyMap's input space (if forward is false) or output space (if forward is true). The new polynomial will be evaluated over this rectangle. The length should equal getNIn() or getNOut(), depending on forward.
Exceptions
std::invalid_argumentif the size of lbnd or ubnd does not match getNIn() (if forward false) or getNOut() (if forward true).
std::invalid_argumentif forward true and the inverse transform is iterative (even if this transform also has inverse coefficients, since the result is unlikely to match user expectations)
std::invalid_argumentif forward false and the forward transform is iterative (even if this transform also has forward coefficients, since the result is unlikely to match user expectations)

Definition at line 30 of file PolyMap.cc.

31  {
32  // If there is an iterative inverse then reject attempts to fit the other direction.
33  // AST catches the case that there are no inverse coefficients,
34  // but I prefer to also raise if there are inverse coefficients because
35  // the iterative inverse cannot match the inverse coefficients, except in the most trivial cases,
36  // and the inverse coefficients are used to fit the forward direction,
37  // so the results are likely to be surprising
38  if (getIterInverse()) {
39  if (forward != isInverted()) {
40  if (forward) {
41  throw std::invalid_argument("Cannot fit forward transform when inverse is iterative");
42  } else {
43  throw std::invalid_argument("Cannot fit inverse transform when forward is iterative");
44  }
45  }
46  }
47  return PolyMap(detail::polyTranImpl<AstPolyMap>(*this, forward, acc, maxacc, maxorder, lbnd, ubnd));
48 }

◆ rate()

double ast::Mapping::rate ( PointD const &  at,
int  ax1,
int  ax2 
) const
inlineinherited

Evaluate the rate of change of the Mapping with respect to a specified input, at a specified position.

The result is estimated by interpolating the function using a fourth order polynomial in the neighbourhood of the specified position. The size of the neighbourhood used is chosen to minimise the RMS residual per unit length between the interpolating polynomial and the supplied Mapping function. This method produces good accuracy but can involve evaluating the Mapping 100 or more times.

Parameters
[in]atThe input position at which the rate of change is to be evaluated.
[in]ax1The index of the output for which the rate of change is to be found (1 for first output).
[in]ax2The index of the input which is to be varied in order to find the rate of change (1 for the first input).
Returns
The rate of change of Mapping output ax1 with respect to input ax2, evaluated at at, or nan if the value cannot be calculated.

Definition at line 215 of file Mapping.h.

215  {
216  detail::assertEqual(at.size(), "at.size", static_cast<std::size_t>(getNIn()), "nIn");
217  double result = astRate(getRawPtr(), const_cast<double *>(at.data()), ax1, ax2);
218  assertOK();
219  return result;
220  }

◆ same()

bool ast::Object::same ( Object const &  other) const
inlineinherited

Does this contain the same AST object as another?

This is a test of identity, not of equality.

Definition at line 212 of file Object.h.

212 { return astSame(getRawPtr(), other.getRawPtr()); }

◆ set()

void ast::Object::set ( std::string const &  setting)
inlineprotectedinherited

Assign a set of attribute values, over-riding any previous values.

The attributes and their new values are specified via a character string, which should contain a comma-separated list of the form: "attribute_1 = value_1, attribute_2 = value_2, ... " where "attribute_n" specifies an attribute name, and the value to the right of each " =" sign should be a suitable textual representation of the value to be assigned. This value will be interpreted according to the attribute's data type.

Notes

  • Attribute names are not case sensitive and may be surrounded by white space
  • Attribute names are not case sensitive and may be surrounded by white space.
  • White space may also surround attribute values, where it will generally be ignored (except for string-valued attributes where it is significant and forms part of the value to be assigned).
  • To include a literal comma or percent sign in the value assigned to an attribute, the whole attribute value should be enclosed in quotation markes.
Exceptions
std::runtime_errorif the attribute is read-only

Definition at line 440 of file Object.h.

440  {
441  astSet(getRawPtr(), "%s", setting.c_str());
442  assertOK();
443  }

◆ setB()

void ast::Object::setB ( std::string const &  attrib,
bool  value 
)
inlineprotectedinherited

Set the value of an attribute as a bool.

If possible, the type you provide is converted to the actual type of the attribute.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 452 of file Object.h.

452  {
453  astSetI(getRawPtr(), attrib.c_str(), value);
454  assertOK();
455  }

◆ setC()

void ast::Object::setC ( std::string const &  attrib,
std::string const &  value 
)
inlineprotectedinherited

Set the value of an attribute as a string.

If possible, the type you provide is converted to the actual type of the attribute.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 464 of file Object.h.

464  {
465  astSetC(getRawPtr(), attrib.c_str(), value.c_str());
466  assertOK();
467  }

◆ setD()

void ast::Object::setD ( std::string const &  attrib,
double  value 
)
inlineprotectedinherited

Set the value of an attribute as a double.

If possible, the type you provide is converted to the actual type of the attribute.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 476 of file Object.h.

476  {
477  astSetD(getRawPtr(), attrib.c_str(), value);
478  assertOK();
479  }

◆ setF()

void ast::Object::setF ( std::string const &  attrib,
float  value 
)
inlineprotectedinherited

Set the value of an attribute as a float.

If possible, the type you provide is converted to the actual type of the attribute.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 488 of file Object.h.

488  {
489  astSetF(getRawPtr(), attrib.c_str(), value);
490  assertOK();
491  }

◆ setI()

void ast::Object::setI ( std::string const &  attrib,
int  value 
)
inlineprotectedinherited

Set the value of an attribute as an int.

If possible, the type you provide is converted to the actual type of the attribute.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 500 of file Object.h.

500  {
501  astSetI(getRawPtr(), attrib.c_str(), value);
502  assertOK();
503  }

◆ setID()

void ast::Object::setID ( std::string const &  id)
inlineinherited

Set ID: object identification string that is not copied.

Definition at line 215 of file Object.h.

215 { setC("ID", id); }

◆ setIdent()

void ast::Object::setIdent ( std::string const &  ident)
inlineinherited

Set Ident: object identification string that is copied.

Definition at line 218 of file Object.h.

218 { setC("Ident", ident); }

◆ setL()

void ast::Object::setL ( std::string const &  attrib,
long int  value 
)
inlineprotectedinherited

Set the value of an attribute as a long int.

If possible, the type you provide is converted to the actual type of the attribute.

Exceptions
std::runtime_errorif the attribute does not exist or the value cannot be converted

Definition at line 512 of file Object.h.

512  {
513  astSetL(getRawPtr(), attrib.c_str(), value);
514  assertOK();
515  }

◆ setReport()

void ast::Mapping::setReport ( bool  report)
inlineinherited

Set Report: report transformed coordinates to stdout?

Definition at line 225 of file Mapping.h.

225 { setB("Report", report); }

◆ setUseDefs()

void ast::Object::setUseDefs ( bool  usedefs)
inlineinherited

Set UseDefs: allow use of default values for Object attributes?

Definition at line 221 of file Object.h.

221 { setB("UseDefs", usedefs); }

◆ show() [1/2]

std::string ast::Object::show ( bool  showComments = true) const
inherited

Return a textual description the object as a string.

Parameters
[in]showCommentsShow comments?

Definition at line 165 of file Object.cc.

165  {
167  show(os, showComments);
168  return os.str();
169 }

◆ show() [2/2]

void ast::Object::show ( std::ostream os,
bool  showComments = true 
) const
inherited

Print a textual description the object to an ostream.

Parameters
[in,out]osThe stream to which to write the string representation.
[in]showCommentsShow comments?

Definition at line 158 of file Object.cc.

158  {
159  Stream stream(nullptr, &os);
160  Channel ch(stream, showComments ? "" : "Comment=0");
161  ch.write(*this);
162  assertOK();
163 }

◆ simplified()

std::shared_ptr<Mapping> ast::Mapping::simplified ( ) const
inlineinherited

Return a simplied version of the mapping (which may be a compound Mapping such as a CmpMap).

Simplification eliminates redundant computational steps and merges separate steps which can be performed more efficiently in a single operation. As a simple example, a Mapping which multiplied coordinates by 5, and then multiplied the result by 10, could be simplified to a single step which multiplied by 50. Similarly, a Mapping which multiplied by 5, and then divided by 5, could be reduced to a simple copying operation.

This function should typically be applied to Mappings which have undergone substantial processing or have been formed by merging other Mappings. It is of potential benefit, for example, in reducing execution time if applied before using a Mapping to transform a large number of coordinates.

Note
If the supplied Mapping is a FrameSet, the returned Mapping will be a deep copy of the supplied FrameSet in which all the inter-Frame Mappings have been simplified. Mappings that have a set value for their ref Object_Ident "Ident" attribute are unchanged by simplification. This is so that their individual identity is preserved. This restriction does not apply to the simplification of Frames. The returned mapping is always independent of the original (a deep copy), unlike astSimplify.

Definition at line 248 of file Mapping.h.

248  {
249  AstObject *rawSimpMap = reinterpret_cast<AstObject *>(astSimplify(getRawPtr()));
250  assertOK(rawSimpMap);
251  return Object::fromAstObject<Mapping>(rawSimpMap, true);
252  }

◆ test()

bool ast::Object::test ( std::string const &  attrib) const
inlineinherited

Has this attribute been explicitly set (and not subsequently cleared)?

Warning
Unlike the underlying astTest function, throws an exception if an error results

Notes

  • Attribute names are not case sensitive and may be surrounded by white space.
  • As you might expect, the returned value for a read-only attribute is always false.
Exceptions
std::runtime_errorif an error results.

Definition at line 250 of file Object.h.

250  {
251  bool res = astTest(getRawPtr(), attrib.c_str());
252  assertOK();
253  return res;
254  }

◆ then()

SeriesMap ast::Mapping::then ( Mapping const &  next) const
inherited

Return a series compound mapping this(first(input)) containing shallow copies of the original.

Parameters
[in]nextthe mapping whose input is the output of this mapping
Exceptions
std::invalid_argumentif the number of input axes of next does not match the number of output axes of this mapping.
Warning
The contained mappings are shallow copies (just like AST); if you want deep copies then make them manually.

Definition at line 37 of file Mapping.cc.

37 { return SeriesMap(*this, next); }

◆ tranGridForward() [1/2]

void ast::Mapping::tranGridForward ( PointI const &  lbnd,
PointI const &  ubnd,
double  tol,
int  maxpix,
Array2D const &  to 
) const
inlineinherited

Transform a grid of points in the forward direction.

Parameters
[in]lbndThe coordinates of the centre of the first pixel in the input grid along each dimension, size = nIn
[in]ubndThe coordinates of the centre of the last pixel in the input grid along each dimension, size = nIn
[in]tolThe maximum tolerable geometrical distortion which may be introduced as a result of approximating non-linear Mappings by a set of piece-wise linear transformations. This should be expressed as a displacement within the output coordinate system of the Mapping.

If piece-wise linear approximation is not required, a value of zero may be given. This will ensure that the Mapping is used without any approximation, but may increase execution time.

If the value is too high, discontinuities between the linear approximations used in adjacent panel will be higher. If this is a problem, reduce the tolerance value used.

Parameters
[in]maxpixA value which specifies an initial scale size (in input grid points) for the adaptive algorithm which approximates non-linear Mappings with piece-wise linear transformations. Normally, this should be a large value (larger than any dimension of the region of the input grid being used). In this case, a first attempt to approximate the Mapping by a linear transformation will be made over the entire input region. If a smaller value is used, the input region will first be divided into sub-regions whose size does not exceed " maxpix" grid points in any dimension. Only at this point will attempts at approximation commence. This value may occasionally be useful in preventing false convergence of the adaptive algorithm in cases where the Mapping appears approximately linear on large scales, but has irregularities (e.g. holes) on smaller scales. A value of, say, 50 to 100 grid points can also be employed as a safeguard in general-purpose software, since the effect on performance is minimal. If too small a value is given, it will have the effect of inhibiting linear approximation altogether (equivalent to setting " tol" to zero). Although this may degrade performance, accurate results will still be obtained.
[in]toComputed points, with dimensions (nPts, nOut), where nPts the desired number of points

Definition at line 358 of file Mapping.h.

359  {
360  _tranGrid(lbnd, ubnd, tol, maxpix, true, to);
361  }

◆ tranGridForward() [2/2]

Array2D ast::Mapping::tranGridForward ( PointI const &  lbnd,
PointI const &  ubnd,
double  tol,
int  maxpix,
int  nPts 
) const
inlineinherited

Transform a grid of points in the inverse direction, returning the results as a new Array2D.

See the overload of tranGridForward that outputs the data as the last argument for more information

Definition at line 369 of file Mapping.h.

369  {
370  Array2D to = ndarray::allocate(nPts, getNOut());
371  _tranGrid(lbnd, ubnd, tol, maxpix, true, to);
372  return to;
373  }

◆ tranGridInverse() [1/2]

void ast::Mapping::tranGridInverse ( PointI const &  lbnd,
PointI const &  ubnd,
double  tol,
int  maxpix,
Array2D const &  to 
) const
inlineinherited

Transform a grid of points in the inverse direction.

See tranGridForward for the arguments, swapping nIn and nOut

Definition at line 380 of file Mapping.h.

381  {
382  _tranGrid(lbnd, ubnd, tol, maxpix, false, to);
383  }

◆ tranGridInverse() [2/2]

Array2D ast::Mapping::tranGridInverse ( PointI const &  lbnd,
PointI const &  ubnd,
double  tol,
int  maxpix,
int  nPts 
) const
inlineinherited

Transform a grid of points in the inverse direction.

See tranGridForward for the arguments, swapping nIn and nOut

Definition at line 390 of file Mapping.h.

390  {
391  Array2D to = ndarray::allocate(nPts, getNIn());
392  _tranGrid(lbnd, ubnd, tol, maxpix, false, to);
393  return to;
394  }

◆ under()

ParallelMap ast::Mapping::under ( Mapping const &  next) const
inherited

Return a parallel compound mapping containing shallow copies of the original.

The resulting mapping has getNIn() + next.getNIn() inputs and getNOut() + next.getNOut() outputs. The first getNIn() axes of input are transformed by this mapping, producing the first getNOut() axes of output. The remaining axes of input are processed by next, resulting in the remaining axes of output.

The name comes the way vectors are sometimes shown for matrix multiplication: vertically, with the first axis at the bottom and the last axis at the top.

Parameters
[in]nextthe mapping that processes the final next.getNin() axes of input to produce the final next.getNout() axes of output.
Warning
The contained mappings are shallow copies (just like AST); if you want deep copies then make them manually.

Definition at line 39 of file Mapping.cc.

39 { return ParallelMap(*this, next); }

◆ unlock()

void ast::Object::unlock ( bool  report = false)
inlineinherited

Unlock this object previously locked using lock, so that other threads can use this object.

See lock for further details.

Parameters
[in]reportIf true, an error will be reported if the supplied Object, or any Object contained within the supplied Object, is not currently locked by the running thread. If false, such Objects will be left unchanged, and no error will be reported.

Notes

  • This function attempts to execute even if AST's global error status is set, but no further error report will be made if it subsequently fails under these circumstances.
  • All unlocked Objects are excluded from AST context handling until they are re-locked using astLock.
  • This function returns without action if the Object is not currently locked by any thread. If it is locked by the running thread, it is unlocked. If it is locked by another thread, an error will be reported if "error" is non-zero.
  • This function returns without action if the AST library has been built without POSIX thread support (i.e. the "-with-pthreads" option was not specified when running the "configure" script).

Definition at line 280 of file Object.h.

280  {
281  astUnlock(getRawPtr(), static_cast<int>(report));
282  assertOK();
283  }

Friends And Related Function Documentation

◆ Object

friend class Object
friend

Definition at line 50 of file PolyMap.h.


The documentation for this class was generated from the following files:
astshim.fitsChanContinued.next
def next(self)
Definition: fitsChanContinued.py:105
from
table::Key< int > from
Definition: TransformMap.cc:348
ast::Object::getB
bool getB(std::string const &attrib) const
Get the value of an attribute as a bool.
Definition: Object.h:348
std::string
STL class.
std::shared_ptr
STL class.
ast::assertOK
void assertOK(AstObject *rawPtr1=nullptr, AstObject *rawPtr2=nullptr)
Throw std::runtime_error if AST's state is bad.
Definition: base.cc:49
ast::Object::setB
void setB(std::string const &attrib, bool value)
Set the value of an attribute as a bool.
Definition: Object.h:452
ast::PolyMap::copyPolymorphic
virtual std::shared_ptr< Object > copyPolymorphic() const override
Return a deep copy of this object.
Definition: PolyMap.h:236
std::vector< double >
ast::Mapping::getNOut
int getNOut() const
Get NOut: the number of output axes.
Definition: Mapping.h:82
ast::PolyMap::PolyMap
PolyMap(ConstArray2D const &coeff_f, ConstArray2D const &coeff_i, std::string const &options="IterInverse=0")
Construct a PolyMap with specified forward and/or inverse transforms.
Definition: PolyMap.h:99
val
ImageT val
Definition: CR.cc:146
lsst::afw::geom.transform.transformContinued.name
string name
Definition: transformContinued.py:32
ast::Mapping::Mapping
Mapping(Mapping const &)=default
Copy constructor: make a deep copy.
ast::Mapping::isInverted
bool isInverted() const
Is this an inverted mapping?
Definition: Mapping.h:95
ast::Object::getClassName
std::string getClassName() const
Get Class: the name of the class (e.g.
Definition: Object.h:139
ast::Object::getI
int getI(std::string const &attrib) const
Get the value of an attribute as an int.
Definition: Object.h:400
ast::Array2D
ndarray::Array< double, 2, 2 > Array2D
2D array of const double; typically used for lists of const points
Definition: base.h:42
other
ItemVariant const * other
Definition: Schema.cc:56
ast::Object::show
void show(std::ostream &os, bool showComments=true) const
Print a textual description the object to an ostream.
Definition: Object.cc:158
std::runtime_error
STL class.
std::invalid_argument
STL class.
ast::Object::copy
std::shared_ptr< Object > copy() const
Return a deep copy of this object.
Definition: Object.h:109
result
py::object result
Definition: _schema.cc:429
ast::detail::getClassName
std::string getClassName(AstObject const *rawObj)
Get the AST class name, changing CmpMap to SeriesMap or ParallelMap as appropriate.
Definition: utils.cc:37
ast::Mapping::copy
std::shared_ptr< Mapping > copy() const
Return a deep copy of this object.
Definition: Mapping.h:72
std::ostringstream
STL class.
to
table::Key< int > to
Definition: TransformMap.cc:349
ast::Mapping::getNIn
int getNIn() const
Get NIn: the number of input axes.
Definition: Mapping.h:77
os
std::ostream * os
Definition: Schema.cc:746
ast::Object::getD
double getD(std::string const &attrib) const
Get the value of an attribute as a double.
Definition: Object.h:374
ast::Object::setC
void setC(std::string const &attrib, std::string const &value)
Set the value of an attribute as a string.
Definition: Object.h:464
ast::detail::polyTranImpl< AstPolyMap >
template AstPolyMap * polyTranImpl< AstPolyMap >(PolyMap const &, bool, double, double, int, std::vector< double > const &, std::vector< double > const &)
ast::arrayFromVector
ConstArray2D arrayFromVector(std::vector< double > const &vec, int nAxes)
Reshape a vector as a 2-dimensional array that shares the same memory.
Definition: base.cc:65
ast::Object::getC
std::string const getC(std::string const &attrib) const
Get the value of an attribute as a string.
Definition: Object.h:361
ast::PolyMap::getIterInverse
bool getIterInverse() const
Get IterInverse: does this provide an iterative inverse transformation?
Definition: PolyMap.h:141
ast::Object::getRawPtr
AstObject const * getRawPtr() const
Get the raw AST pointer.
Definition: Object.h:292
std::size_t
ast::detail::assertEqual
void assertEqual(T1 val1, std::string const &descr1, T2 val2, std::string const &descr2)
Definition: utils.h:48
lsst::sphgeom::invert
Relationship invert(Relationship r)
Given the relationship between two sets A and B (i.e.
Definition: Relationship.h:55