DGtal::functors::Projector< S > Struct Template Reference

Aim: Functor that maps a point P of dimension i to a point Q of dimension j. The member myDims is an array containing the coordinates - (0, 1, ..., j-1) by default - that are copied from P to Q. More...

#include <DGtal/kernel/BasicPointFunctors.h>

Inheritance diagram for DGtal::functors::Projector< S >:

Public Types
typedef S	Space
typedef Space::Dimension	Dimension
typedef Space::Integer	Integer
typedef Space::Point	Point

Public Member Functions
	BOOST_STATIC_CONSTANT (Dimension, dimension=Space::dimension)
	Projector (const Integer &aDefaultInteger=NumberTraits< Integer >::zero())
template<typename TIterator>
void	init (const TIterator &itb, const TIterator &ite)
void	initRemoveOneDim (const Dimension &dimRemoved)
void	initAddOneDim (const Dimension &newDim)
template<typename TInputPoint>
Point	operator() (const TInputPoint &aPoint) const

Private Attributes
std::array< Dimension, dimension >	myDims
Integer	myDefaultInteger

Detailed Description

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>
struct DGtal::functors::Projector< S >

Aim: Functor that maps a point P of dimension i to a point Q of dimension j. The member myDims is an array containing the coordinates - (0, 1, ..., j-1) by default - that are copied from P to Q.

Description of template class 'Projector'

Ex: for i = 3 and j = 2, the first two coordinates (numbered 0 and 1) are copied so that point (x,y,z) is is mapped to point (x,y).

All kth coordinates (0 < k < j) that are greater than i, are set to a value given at construction (0 by defaut).

Ex: for i = 2 and j = 3, the first two coordinates (numbered 0 and 1) are copied so that point (x,y) is is mapped to point (x,y,0).

Instead of using the default order, you can define your own orthonormal basis as shown below:

PointVector<3,int> p(3,1,5):
 
Projector<SpaceND<2,int> > proj;
proj( p ) //== (3,1)
 
...
//v (2, 0): selection of the 2nd and 0th basis vectors
proj.init(v.begin(), v.end());
proj( p ) //== (5,3)

Template Parameters

S	type for the space where must lie the projected point

Examples

images/extract2DSlicesImagesFrom3D.cpp, io/viewers/viewer3D-8-2DSliceImages.cpp, and tutorial-examples/2DSliceImageFromVol.cpp.

Definition at line 106 of file BasicPointFunctors.h.

Member Typedef Documentation

Dimension

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

typedef Space::Dimension DGtal::functors::Projector< S >::Dimension

Definition at line 109 of file BasicPointFunctors.h.

Integer

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

typedef Space::Integer DGtal::functors::Projector< S >::Integer

Definition at line 111 of file BasicPointFunctors.h.

Point

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

typedef Space::Point DGtal::functors::Projector< S >::Point

Definition at line 112 of file BasicPointFunctors.h.

Space

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

typedef S DGtal::functors::Projector< S >::Space

Definition at line 108 of file BasicPointFunctors.h.

Constructor & Destructor Documentation

Projector()

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

DGtal::functors::Projector< S >::Projector

(

const Integer &

aDefaultInteger = NumberTraits< Integer >::zero()

)

Default constructor

Member Function Documentation

BOOST_STATIC_CONSTANT()

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

DGtal::functors::Projector< S >::BOOST_STATIC_CONSTANT	(	Dimension	,
		dimension	= Space::dimension )

init()

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

template<typename TIterator>

void DGtal::functors::Projector< S >::init	(	const TIterator &	itb,
		const TIterator &	ite )

Initialization of the array of relevant dimensions

Parameters

itb	begin iterator on dimensions.
ite	end iterator on dimensions.

initAddOneDim()

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

void DGtal::functors::Projector< S >::initAddOneDim

(

const Dimension &

newDim

)

Initialisation by adding a given dimension.

Parameters

newDim

the new dimension.

Examples

images/extract2DSlicesImagesFrom3D.cpp, io/viewers/viewer3D-8-2DSliceImages.cpp, and tutorial-examples/2DSliceImageFromVol.cpp.

Referenced by main(), main(), and testSliceImageFromFunctor().

initRemoveOneDim()

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

void DGtal::functors::Projector< S >::initRemoveOneDim

(

const Dimension &

dimRemoved

)

Initialisation by removing a given dimension.

Parameters

dimRemoved

the removed dimension.

Examples

io/viewers/viewer3D-8-2DSliceImages.cpp.

Referenced by main(), and testSliceImageFromFunctor().

operator()()

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

template<typename TInputPoint>

Point DGtal::functors::Projector< S >::operator()

(

const TInputPoint &

aPoint

)

const

Main operator

Parameters

aPoint

any point.

Returns

the projected point.

Field Documentation

myDefaultInteger

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

Integer DGtal::functors::Projector< S >::myDefaultInteger

private

Default integer set to coordinates of the projected point not in the input point

Definition at line 161 of file BasicPointFunctors.h.

myDims

template<typename S = SpaceND< 2, DGtal::Z2i::Integer >>

std::array<Dimension, dimension> DGtal::functors::Projector< S >::myDims

private

Array storing the coordinates that are copied from the input point to its projection (order matters)

Definition at line 155 of file BasicPointFunctors.h.

---

The documentation for this struct was generated from the following file:

• BasicPointFunctors.h