DGtal::detail::NormalVectorFromDCA Struct Reference

#include <SegmentComputerEstimators.h>

Public Types
typedef PointVector< 2, double >	Value

Public Member Functions
template<typename DCA >
Value	operator() (const typename DCA::ConstIterator &it, const DCA &aDCA) const

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Detailed Description

Description of class 'NormalVectorFromDCA'

Aim: estimates the normal at a given position from a geometricDCA.

Definition at line 836 of file SegmentComputerEstimators.h.

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Member Typedef Documentation

typedef PointVector<2,double> DGtal::detail::NormalVectorFromDCA::Value

Definition at line 839 of file SegmentComputerEstimators.h.

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Member Function Documentation

template<typename DCA >

Value DGtal::detail::NormalVectorFromDCA::operator() ( const typename DCA::ConstIterator &  it, const DCA &  aDCA  ) const

inline

Operator()

Returns:

normal at it

Parameters:

it	position where the estimation has to be done
aDCA	an instance of segment computer devoted to the DCA recognition.

Template Parameters:

DCA	a model of segment computer devoted to the DCA recognition, basically geometricDCA.

Definition at line 856 of file SegmentComputerEstimators.h.

      {
        typedef typename DCA::ConstIterator ConstIterator; 
        typedef typename DCA::Pair Pair; 
        typedef typename DCA::Point Point;
        typedef typename Point::Coordinate Coordinate; 
        
        if ( !aDCA.isStraight() )
          {
            //separating circle center
            double c0, c1, r; 
            aDCA.getSeparatingCircle().getParameters(c0, c1, r);
            //point
            Pair pair = *it; 
            Point i = pair.first; 
            Point o = pair.second;
            double m0 = NumberTraits<Coordinate>::castToDouble(i[0]+o[0]) / 2.0; 
            double m1 = NumberTraits<Coordinate>::castToDouble(i[1]+o[1]) / 2.0;
            //normal vector 
            double v0 = m0 - c0; 
            double v1 = m1 - c1; 
            //norm
            double n = std::sqrt(v0*v0 + v1*v1); 
            return Value( v0/n, v1/n );
          }
        else
          {
            //separating straight line and normal vector
            double a, b, c; 
            aDCA.getGeometricalDSSPtr()->getParameters(a, b, c);
            //norm
            double n = std::sqrt(a*a + b*b); 
            return Value( a/n, b/n ); 
          }
      }

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

• SegmentComputerEstimators.h