DGtal::detail::RecursivePConvexity< 1, TInteger > Struct Template Reference

#include <DGtal/geometry/volumes/PConvexity.h>

Inheritance diagram for DGtal::detail::RecursivePConvexity< 1, TInteger >:

Public Types
using	Integer = TInteger
using	Point = PointVector< 1, Integer >
using	ProjPoint
using	ProjPConvexity

Public Member Functions
	BOOST_CONCEPT_ASSERT ((concepts::CInteger< TInteger >))
	Integer must be a model of the concept CInteger.
	RecursivePConvexity (Dimension)
	Default constructor. Nothing to do.
void	init (Dimension bd=dim)

Static Public Member Functions
static bool	is0Convex (std::vector< Point > X, bool safe)
static bool	isPConvex (const std::vector< Point > &X, bool safe)
static double	convexityMeasure (std::vector< Point > X, bool safe)
static double	fullConvexityMeasure (const std::vector< Point > &X, bool safe)
static ProjPoint	project (const Point &p, Dimension a)

Data Fields
std::vector< ProjPConvexity >	projp
	The array of lower dimensional P-convexities.

Detailed Description

template<typename TInteger>
struct DGtal::detail::RecursivePConvexity< 1, TInteger >

Hidden class to represent the P-convexity in a recursive way. Only used to compute P-convexity, but not exposed to users. Specialization for dimension 1

Note

This d-dimensional object builds d (d-1)-dimensional similar objects, but the k-th remembers to build only k lower dimensional ones.

Template Parameters

dim	the dimension of the digital space
TInteger	any model of integer (used to represent digital point coordinates).

Definition at line 251 of file PConvexity.h.

Member Typedef Documentation

Integer

template<typename TInteger>

using DGtal::detail::RecursivePConvexity< 1, TInteger >::Integer = TInteger

Definition at line 254 of file PConvexity.h.

Point

template<typename TInteger>

using DGtal::detail::RecursivePConvexity< 1, TInteger >::Point = PointVector< 1, Integer >

Definition at line 255 of file PConvexity.h.

ProjPConvexity

using DGtal::detail::RecursivePConvexity< dim, TInteger >::ProjPConvexity

Definition at line 72 of file PConvexity.h.

ProjPoint

using DGtal::detail::RecursivePConvexity< dim, TInteger >::ProjPoint

Definition at line 71 of file PConvexity.h.

Constructor & Destructor Documentation

RecursivePConvexity()

template<typename TInteger>

DGtal::detail::RecursivePConvexity< 1, TInteger >::RecursivePConvexity ( Dimension )

inline

Default constructor. Nothing to do.

Definition at line 258 of file PConvexity.h.

      {}

Member Function Documentation

BOOST_CONCEPT_ASSERT()

template<typename TInteger>

DGtal::detail::RecursivePConvexity< 1, TInteger >::BOOST_CONCEPT_ASSERT

(

(concepts::CInteger< TInteger >)

)

Integer must be a model of the concept CInteger.

convexityMeasure()

template<typename TInteger>

double DGtal::detail::RecursivePConvexity< 1, TInteger >::convexityMeasure ( std::vector< Point > X, bool safe )

inlinestatic

Parameters

X	any range of lattice points (without duplicates)
safe	is a not used parameter for dimension 1, but is kept for the meta-programming recursive definition of P-convexity.

Precondition

X must not contain any duplicates.

Returns

a measure that has value 1.0 when X is digitally convex, and less otherwise.

Definition at line 307 of file PConvexity.h.

      {
        (void) safe; //< not used in dimension 1.
        if ( X.empty() ) return 1.0;
        std::sort( X.begin(), X.end() );
        Integer nb =  Integer(X.back()[ 0 ]) - Integer(X.front()[ 0 ]) + Integer(1);
        return double( X.size() ) / double( nb );
      }

fullConvexityMeasure()

template<typename TInteger>

double DGtal::detail::RecursivePConvexity< 1, TInteger >::fullConvexityMeasure ( const std::vector< Point > & X, bool safe )

inlinestatic

Parameters

X	any range of lattice points (without duplicates)
safe	is a not used parameter for dimension 1, but is kept for the meta-programming recursive definition of P-convexity.

Precondition

X must not contain any duplicates.

Returns

a measure that has value 1.0 when X is P-convex (or equivalently fully convex), and less otherwise.

Definition at line 327 of file PConvexity.h.

      {
        return convexityMeasure( X, safe );
      }

References DGtal::detail::RecursivePConvexity< dim, TInteger >::convexityMeasure().

init()

void DGtal::detail::RecursivePConvexity< dim, TInteger >::init ( Dimension bd = dim )

inline

Parameters

bd	the maximum axis of projection.

Definition at line 83 of file PConvexity.h.

      {
        for ( Dimension j = 0; j < bd; j++ )
          projp.push_back( ProjPConvexity( j ) );
      }

is0Convex()

template<typename TInteger>

bool DGtal::detail::RecursivePConvexity< 1, TInteger >::is0Convex ( std::vector< Point > X, bool safe )

inlinestatic

Parameters

X	any range of lattice points (without duplicates)
safe	is a not used parameter for dimension 1, but is kept for the meta-programming recursive definition of P-convexity.

Returns

'true' if and only if X is a digital set in the classic sense, i.e. $Conv(X) \cap Z^d = X$.

Note

Unused second parameter.

Definition at line 272 of file PConvexity.h.

      {
        (void) safe;
        std::sort( X.begin(), X.end() );
        return X.empty()
          || ( ( Integer(X.back()[ 0 ]) - Integer(X.front()[ 0 ]) + Integer(1) )
               == Integer( X.size() ) );
      }

isPConvex()

template<typename TInteger>

bool DGtal::detail::RecursivePConvexity< 1, TInteger >::isPConvex ( const std::vector< Point > & X, bool safe )

inlinestatic

Parameters

X	any range of lattice points (without duplicates)
safe	is a not used parameter for dimension 1, but is kept for the meta-programming recursive definition of P-convexity.

Returns

'true' if and only if X is a P-convex digital set.

Precondition

X must not contain any duplicates.

Definition at line 291 of file PConvexity.h.

      {
        return is0Convex( X, safe );
      }

References DGtal::detail::RecursivePConvexity< dim, TInteger >::is0Convex().

project()

ProjPoint DGtal::detail::RecursivePConvexity< dim, TInteger >::project ( const Point & p, Dimension a )

inlinestatic

Projects a point p along dimension a.

Parameters

[in]	p	any digital point
[in]	a	any dimension

Returns

the digital point of dimension (d-1) with omitted a-th coordinate.

Definition at line 206 of file PConvexity.h.

      {
        ProjPoint pp;
        Dimension j = 0;
        for ( Dimension i = 0; i < Point::dimension; i++ )
          if ( i != a ) pp[ j++ ] = p[ i ];
        return pp;
      }

Field Documentation

projp

std::vector< ProjPConvexity > DGtal::detail::RecursivePConvexity< dim, TInteger >::projp

The array of lower dimensional P-convexities.

Definition at line 237 of file PConvexity.h.

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

• PConvexity.h