DGtal::functors::HatPointFunction< TPoint, TScalar > Struct Template Reference

#include <DGtal/kernel/Point2ScalarFunctors.h>

Public Types
typedef TPoint	Point
typedef TScalar	Scalar
typedef Point	argument_type
typedef Scalar	value_type

Public Member Functions
	HatPointFunction (Scalar v0, Scalar r)
Scalar	operator() (const Point &p) const

Data Fields
Scalar	myV0
Scalar	myV0OverR
Scalar	myR
Scalar	myR2

Detailed Description

template<typename TPoint, typename TScalar>
struct DGtal::functors::HatPointFunction< TPoint, TScalar >

The hat function of value v0 at point 0 with a linear decrease to 0 at distance r. A function Point -> Scalar.

Examples

geometry/surfaces/dvcm-3d.cpp, and geometry/volumes/dvcm-2d.cpp.

Definition at line 55 of file Point2ScalarFunctors.h.

Member Typedef Documentation

argument_type

template<typename TPoint , typename TScalar >

typedef Point DGtal::functors::HatPointFunction< TPoint, TScalar >::argument_type

Definition at line 58 of file Point2ScalarFunctors.h.

Point

template<typename TPoint , typename TScalar >

typedef TPoint DGtal::functors::HatPointFunction< TPoint, TScalar >::Point

Definition at line 56 of file Point2ScalarFunctors.h.

Scalar

template<typename TPoint , typename TScalar >

typedef TScalar DGtal::functors::HatPointFunction< TPoint, TScalar >::Scalar

Definition at line 57 of file Point2ScalarFunctors.h.

value_type

template<typename TPoint , typename TScalar >

typedef Scalar DGtal::functors::HatPointFunction< TPoint, TScalar >::value_type

Definition at line 59 of file Point2ScalarFunctors.h.

Constructor & Destructor Documentation

HatPointFunction()

template<typename TPoint , typename TScalar >

DGtal::functors::HatPointFunction< TPoint, TScalar >::HatPointFunction ( Scalar  v0, Scalar  r  )

inline

Definition at line 67 of file Point2ScalarFunctors.h.

        : myV0( v0 ), myV0OverR( v0 / r ), myR( r ), myR2( r*r ) {}

Member Function Documentation

operator()()

template<typename TPoint , typename TScalar >

Scalar DGtal::functors::HatPointFunction< TPoint, TScalar >::operator() ( const Point &  p ) const

inline

Definition at line 69 of file Point2ScalarFunctors.h.

      {
        Scalar d = 0;
        for ( typename Point::ConstIterator it = p.begin(), itE = p.end(); it != itE; ++it )
          d += functions::square( (Scalar) *it );
        if ( d >= myR2 ) return 0.0;
        d = sqrt( d );
        return myV0 - myV0OverR * d;
      }

References DGtal::functors::HatPointFunction< TPoint, TScalar >::myR2, DGtal::functors::HatPointFunction< TPoint, TScalar >::myV0, DGtal::functors::HatPointFunction< TPoint, TScalar >::myV0OverR, and DGtal::functions::square().

Field Documentation

myR

template<typename TPoint , typename TScalar >

Scalar DGtal::functors::HatPointFunction< TPoint, TScalar >::myR

Definition at line 63 of file Point2ScalarFunctors.h.

myR2

template<typename TPoint , typename TScalar >

Scalar DGtal::functors::HatPointFunction< TPoint, TScalar >::myR2

Definition at line 64 of file Point2ScalarFunctors.h.

Referenced by DGtal::functors::HatPointFunction< TPoint, TScalar >::operator()().

myV0

template<typename TPoint , typename TScalar >

Scalar DGtal::functors::HatPointFunction< TPoint, TScalar >::myV0

Definition at line 61 of file Point2ScalarFunctors.h.

Referenced by DGtal::functors::HatPointFunction< TPoint, TScalar >::operator()().

myV0OverR

template<typename TPoint , typename TScalar >

Scalar DGtal::functors::HatPointFunction< TPoint, TScalar >::myV0OverR

Definition at line 62 of file Point2ScalarFunctors.h.

Referenced by DGtal::functors::HatPointFunction< TPoint, TScalar >::operator()().

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

• Point2ScalarFunctors.h