DGtal::detail::NormalizedTangentVectorFromDSS Struct Reference

#include <DGtal/geometry/curves/estimation/SegmentComputerEstimators.h>

Public Types
typedef DGtal::PointVector< 2, double >	RealVector
typedef RealVector	Value

Public Member Functions
template<typename DSS >
Value	operator() (const DSS &aDSS) const

Detailed Description

Description of class 'NormalizedTangentVectorFromDSS'

Aim: computes the unit vector of a DSS

Definition at line 715 of file SegmentComputerEstimators.h.

Member Typedef Documentation

RealVector

typedef DGtal::PointVector<2,double> DGtal::detail::NormalizedTangentVectorFromDSS::RealVector

Definition at line 718 of file SegmentComputerEstimators.h.

Value

typedef RealVector DGtal::detail::NormalizedTangentVectorFromDSS::Value

Definition at line 719 of file SegmentComputerEstimators.h.

Member Function Documentation

operator()()

template<typename DSS >

Value DGtal::detail::NormalizedTangentVectorFromDSS::operator() ( const DSS &  aDSS ) const

inline

Operator()

Returns

normalized tangent

Parameters

aDSS	an instance of segment computer devoted to the DSS recognition.

Template Parameters

DSS	a model of segment computer, which must have methods a() and b() returning the y- and x-component of the tangent vector.

Definition at line 734 of file SegmentComputerEstimators.h.

      {
        double x = NumberTraits<typename DSS::Integer>
          ::castToDouble( aDSS.b() ); 
        double y = NumberTraits<typename DSS::Integer>
          ::castToDouble( aDSS.a() );
        RealVector v(x,y); 
        double norm = v.norm(RealVector::L_2);
        v /= norm; 
        return v;
      }

References DGtal::NumberTraitsImpl< std::decay< T >::type >::castToDouble(), and DGtal::PointVector< 2, double >::L_2.

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

• SegmentComputerEstimators.h