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All 2D spatial sorting algorithms provided in Cgal are parameterized by a traits class Traits, which defines the primitives (objects and predicates) that the sorting algorithms use. SpatialSortingTraits_2 defines the complete set of primitives required in these functions and functors.
SpatialSortingTraits_2::Point_2 | |
The point type on which the sorting algorithms operate.
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SpatialSortingTraits_2::Compute_x_2 | |
Functor object type returning the x coordinate of a Point_2.
Must provide
FT operator()(Point_2 p) where FT can be used as
argument of CGAL::to_double.
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SpatialSortingTraits_2::Compute_y_2 | |
Functor object type returning the y coordinate of a Point_2.
Must provide
FT operator()(Point_2 p) where FT can be used as
argument of CGAL::to_double.
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SpatialSortingTraits_2::Less_x_2 | |
Binary predicate object type comparing Point_2s
along the x coordinate.
Must provide
bool operator()(Point_2 p, Point_2 q) where true
is returned iff px < qx,
where px and qx denote x coordinate of point p and q,
respectively.
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SpatialSortingTraits_2::Less_y_2 | |
Binary predicate object type comparing Point_2s
along the y coordinate.
Must provide
bool operator()(Point_2 p, Point_2 q) where true
is returned iff py < qy,
where py and qy denote y coordinate of point p and q,
respectively.
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Only a copy constructor is required.
SpatialSortingTraits_2 traits ( t); |
The following member functions to create instances of the above predicate object types must exist.
Compute_x_2 | traits.compute_x_2_object () | |
Compute_y_2 | traits.compute_y_2_object () | |
Less_x_2 | traits.less_x_2_object () | |
Less_y_2 | traits.less_y_2_object () |
Any Cgal kernel.
CGAL::Spatial_sort_traits_adapter_2<Base_traits,PointPropertyMap>.