Abstract base class for interpolator used by CurvedLattice2D. More...

#include <CLInterpolator2D.h>

Inheritance diagram for casa::CLInterpolator2D< T >:

Public Member Functions
	CLInterpolator2D ()
virtual	~CLInterpolator2D ()
virtual CLInterpolator2D< T > *	clone () const =0
	Let a derived class make a copy of itself.
void	set (MaskedLattice< T > *lattice, const AxesMapping &axesMap, uInt axis1, uInt axis2, uInt curveAxis)
	Set the internals to the values of the CurvedLattice using it.
virtual void	getData (Array< T > &buffer, const Vector< Float > &x, const Vector< Float > &y, const Slicer &section)=0
	Get the data for the given pixel points (on axis1 and axis2) and the chunk in the other axes as given by the section.
virtual void	getMask (Array< Bool > &buffer, const Vector< Float > &x, const Vector< Float > &y, const Slicer &section)=0
	Get the mask for the given pixel points (on axis1 and axis2) and the chunk in the other axes as given by the section.
Protected Member Functions
	CLInterpolator2D (const CLInterpolator2D< T > &)
	Copy constructor can only be used by derived classes.
CLInterpolator2D &	operator= (const CLInterpolator2D< T > &)
	Assignment can only be used by derived classes.
virtual void	preset ()
	Let a derived class do some initial work after set is called.
Protected Attributes
MaskedLattice< T > *	itsLatticePtr
AxesMapping	itsAxesMap
uInt	itsAxis1
uInt	itsAxis2
uInt	itsCurveAxis
Bool	itsIsRef

Detailed Description

template<class T>
class casa::CLInterpolator2D< T >

Abstract base class for interpolator used by CurvedLattice2D.

Intended use:

Internal

Review Status

Test programs:: tCurvedLattice2D

Prerequisite

CurvedLattice2D

Etymology

The CL in CLInterpolator2D means CurvedLattice. The 2D means that interpolation in 2 dimensions needs to be done.

Synopsis

CurvedLattice2D needs lattice data which are not on exact grid points. Therefore some interpolation scheme is needed. The abstract base class CLInterpolation2D makes it possible for CurvedLattice2D to use any interpolation scheme. Currently the only derived class is CLIPNearest2D
Apart from interpolating and returning data, a derived class also has to return a mask. For instance, in a possible derived class using 4-point interpolation, the interpolation scheme has to take the image mask into account, and make a mask for its output data (say that the output point is masked off if its 4 input points are masked off).

This base class has some data members defining the lattice and the lattice axes to be interpolated. When these data members are set, the virtual function preset is called. A derived class can implement this function to do some precalculations, etc..

Motivation

This class makes it possible to hide the interpolation to be used from the CurvedLattice2D class.

Definition at line 87 of file CLInterpolator2D.h.

Constructor & Destructor Documentation

template<class T >

casa::CLInterpolator2D< T >::CLInterpolator2D ( ) [inline]

Definition at line 91 of file CLInterpolator2D.h.

template<class T >

virtual casa::CLInterpolator2D< T >::~CLInterpolator2D ( ) [virtual]

template<class T >

casa::CLInterpolator2D< T >::CLInterpolator2D ( const CLInterpolator2D< T > & ) [protected]

Copy constructor can only be used by derived classes.

Member Function Documentation

template<class T >

virtual CLInterpolator2D<T>* casa::CLInterpolator2D< T >::clone ( ) const [pure virtual]

Let a derived class make a copy of itself.

Implemented in casa::CLIPNearest2D< T >.

template<class T >

virtual void casa::CLInterpolator2D< T >::getData	(	Array< T > &	buffer,
		const Vector< Float > &	x,
		const Vector< Float > &	y,
		const Slicer &	section
	)		`[pure virtual]`

Get the data for the given pixel points (on axis1 and axis2) and the chunk in the other axes as given by the section.

The Slicer is fixed and the buffer has the correct shape.

Implemented in casa::CLIPNearest2D< T >.

template<class T >

virtual void casa::CLInterpolator2D< T >::getMask	(	Array< Bool > &	buffer,
		const Vector< Float > &	x,
		const Vector< Float > &	y,
		const Slicer &	section
	)		`[pure virtual]`

Get the mask for the given pixel points (on axis1 and axis2) and the chunk in the other axes as given by the section.

The Slicer is fixed and the buffer has the correct shape.

Implemented in casa::CLIPNearest2D< T >.

template<class T >

CLInterpolator2D& casa::CLInterpolator2D< T >::operator= ( const CLInterpolator2D< T > & ) [protected]

Assignment can only be used by derived classes.

template<class T >

virtual void casa::CLInterpolator2D< T >::preset ( ) [protected, virtual]

Let a derived class do some initial work after set is called.

The default implementation does nothing.

template<class T >

void casa::CLInterpolator2D< T >::set	(	MaskedLattice< T > *	lattice,
		const AxesMapping &	axesMap,
		uInt	axis1,
		uInt	axis2,
		uInt	curveAxis
	)

Set the internals to the values of the CurvedLattice using it.

Note that only a copy of the lattice pointer is made. Thereafter the virtual function preset() is called to give a derived class the opportunity to do some initial work.