CGAL 6.1.1 - 2D Alpha Shapes

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WeightedAlphaShapeTraits_2 Concept Reference
Reference Manual » Concepts

## Definition

The concept `WeightedAlphaShapeTraits_2` describes the requirements for the geometric traits class of the underlying regular triangulation of a weighted alpha shape.

Refines
  `RegularTriangulationTraits_2` if the underlying triangulation of the alpha shape is a regular triangulation.

Has models
  All models of `Kernel`,
  Projection traits such as `CGAL::Projection_traits_xy_3<K>`

See also
  `CGAL::Exact_predicates_inexact_constructions_kernel` (recommended kernel)

## Types
typedef unspecified_type | FT
| A coordinate type.

## Creation
Only a default constructor is required. Note that further constructors can be provided.
| WeightedAlphaShapeTraits_2 ()
| A default constructor.

## Constructions by function objects
Compute_squared_radius_smallest_orthogonal_circle_2 | compute_squared_radius_smallest_orthogonal_circle_2_object ()
| Returns an object, which has to be able to compute the squared radius of the orthogonal circle of the points `p0, p1, p2` or the squared radius of the smallest orthogonal circle of the points `p0, p1`, as `FT`.

## Predicate by function object
Power_side_of_bounded_power_circle_2 | power_side_of_bounded_power_circle_2_object ()
| Returns an object, which has to be able to compute the relative position of the point `test` to the smallest orthogonal circle of the points `p0, p1`.

## Member Typedef Documentation

## ◆ FT

typedef unspecified_type WeightedAlphaShapeTraits_2::FT

A coordinate type.

The type must provide a copy constructor, assignment, comparison operators, negation, multiplication, division and allow the declaration and initialization with a small integer constant (cf. requirements for number types). An obvious choice would be coordinate type of the point class.