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% | Reference manual page: InterpolationTraits.tex
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% | 06.04.2000   Author
% | Package: Package
% | 
\RCSdef{\RCSInterpolationtraitsRev}{$Id$}
\RCSdefDate{\RCSInterpolationtraitsDate}{$Date$}
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\begin{ccRefConcept}{InterpolationTraits}

\ccDefinition
  
Most interpolation functions are parameterized by a traits class that
defines the primitives used in the interpolation algorithms.  The concept
\ccRefName\ defines this common set of requirements.  


\ccTypes \ccNestedType{FT}{The number type must follow the model
  \ccc{FieldNumberType}.}  \ccNestedType{Point_d}{The point type on
  which the function is defined and interpolated.}
\ccNestedType{Vector_d}{The corresponding vector type.}
\ccNestedType{Construct_vector_d} {A constructor object for
  \ccc{Vector_d}.
  Provides~: \\
  \ccc{Vector_d operator() (Point_d a, Point_d b)} which produces the
  vector \ccc{b -
    a} and \\
  \ccc{Vector_d operator() (Null_vector NULL_VECTOR)} which introduces
  the null vector.}
\ccNestedType{Construct_scaled_vector_d}{Constructor object for
  \ccc{Vector_d}.
  Provides~: \\
  \ccc{Vector_d operator() (Vector_d v,FT scale)} which produces the
  vector \ccc{v} scaled by a factor \ccc{scale}.}
\ccNestedType{Compute_squared_distance_d} {Constructor
  object for \ccc{FT}. Provides the operator:\\
  \ccc{FT operator() (Point_d a, Point_d b)} returning the squared
  distance between \ccc{a} and \ccc{b}.}

%\ccCreation
\ccCreationVariable{traits}  %% choose variable name
\ccConstructor{InterpolationTraits();}{default constructor.}


\ccHeading{Construction objects} The following functions that
create instances of the above constructor object types must exist.
\ccMethod{Construct_vector_d construct_vector_d_object();}{}
\ccGlue
\ccMethod{Construct_scaled_vector_d construct_scaled_vector_d_object();}{}
\ccGlue
\ccMethod{Compute_squared_distance_d compute_squared_distance_d_object();}{}

\ccHasModels
\ccRefIdfierPage{CGAL::Interpolation_traits_2<K>}\\
\ccRefIdfierPage{CGAL::Interpolation_gradient_fitting_traits_2<K>}\\

\ccSeeAlso
\ccRefConceptPage{GradientFittingTraits}\\
\ccRefIdfierPage{CGAL::sibson_c1_interpolation} \\
\ccRefIdfierPage{CGAL::sibson_gradient_fitting} \\
\ccRefIdfierPage{CGAL::farin_c1_interpolation} \\
\ccRefIdfierPage{CGAL::quadratic_interpolation} \\
%\ccRefIdfierPage{CGAL::natural_neighbor_coordinates_2}\\
%\ccRefIdfierPage{CGAL::regular_neighbor_coordinates_2} \\
%\ccRefIdfierPage{CGAL::surface_neighbor_coordinates_3}\\

\end{ccRefConcept}