CGAL 6.1.1 - 2D Conforming Triangulations and Meshes

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CGAL::Delaunay_mesh_size_criteria_2< CDT > Class Template Reference
Reference Manual

`#include <CGAL/Delaunay_mesh_size_criteria_2.h>`

## Definition

template<typename CDT>
class CGAL::Delaunay_mesh_size_criteria_2< CDT >

The class `Delaunay_mesh_size_criteria_2` is a model for the `MeshingCriteria_2` concept.

The shape criterion on triangles is given by a bound \( B\) such that for good triangles \( \frac{r}{l} \le B\) where \( l\) is the shortest edge length and \( r\) is the circumradius of the triangle. By default, \( B=\sqrt{2}\), which is the best bound one can use with the guarantee that the refinement algorithm will terminate. The upper bound \( B\) is related to a lower bound \( \alpha_{min}\) on the minimum angle in the triangle:

\[ \sin{ \alpha_{min} } = \frac{1}{2 B} \]

so \( B=\sqrt{2}\) corresponds to \( \alpha_{min} \ge 20.7\) degrees.

This traits class defines also a size criteria: all segments of all triangles must be shorter than a bound \( S\).

Template Parameters

  CDT | must be a 2D constrained Delaunay triangulation.

Is model of
  `MeshingCriteria_2`

Examples
  Mesh_2/mesh_class.cpp, Mesh_2/mesh_global.cpp, and Mesh_2/mesh_optimization.cpp.

## Creation
| Delaunay_mesh_size_criteria_2 ()
| Default constructor with \( B=\sqrt{2}\).
| Delaunay_mesh_size_criteria_2 (double b=0.125, double S=0)
| Construct a traits class with bound \( B=\sqrt{\frac{1}{4 b}}\).

## Constructor & Destructor Documentation

## ◆ Delaunay_mesh_size_criteria_2() [1/2]

template<typename CDT >

CGAL::Delaunay_mesh_size_criteria_2< CDT >::Delaunay_mesh_size_criteria_2 | ( |  | ) |

Default constructor with \( B=\sqrt{2}\).

No bound on size.

## ◆ Delaunay_mesh_size_criteria_2() [2/2]

template<typename CDT >

CGAL::Delaunay_mesh_size_criteria_2< CDT >::Delaunay_mesh_size_criteria_2 | ( | double | b = `0.125`,
|  | double | S = `0`
| ) |  |

Construct a traits class with bound \( B=\sqrt{\frac{1}{4 b}}\).

If \( S \neq0\), the size bound is \( S\). If \( S = 0\), there is no bound on size.