TriangleInterface::PolygonHole

Section: C Library Functions (3) Updated: Thu Apr 7 2011 Local index Up

NAME

TriangleInterface::PolygonHole -

SYNOPSIS

Inherits TriangleInterface::Hole.

Public Member Functions

PolygonHole (Point center, Real radius, unsigned int n_points)

virtual unsigned int n_points () const

virtual Point point (const unsigned int n) const

virtual Point inside () const

Private Attributes

Point _center

Real _radius

unsigned int _n_points

Detailed Description

A concrete instantiation of the Hole class that describes polygonal (triangular, square, pentagonal, ...) holes.

Definition at line 318 of file mesh_triangle_support.h.

Constructor & Destructor Documentation

TriangleInterface::PolygonHole::PolygonHole (Pointcenter, Realradius, unsigned intn_points) [inline]Constructor specifying the center, radius, and number of points which comprise the hole. The points will all lie on a circle of radius r.

Definition at line 326 of file mesh_triangle_support.h.

                                                                :
    _center(center),
    _radius(radius),
    _n_points(n_points) {}

Member Function Documentation

virtual Point TriangleInterface::PolygonHole::inside () const [inline, virtual]The center of the hole is definitely inside.

Implements TriangleInterface::Hole.

Definition at line 351 of file mesh_triangle_support.h.

References _center.

{ return _center;  }

virtual unsigned int TriangleInterface::PolygonHole::n_points () const [inline, virtual]Default Constructor, does not set any values

Implements TriangleInterface::Hole.

Definition at line 336 of file mesh_triangle_support.h.

References _n_points.

{ return _n_points; }

virtual Point TriangleInterface::PolygonHole::point (const unsigned intn) const [inline, virtual]Return the nth point defining the hole.

Implements TriangleInterface::Hole.

Definition at line 338 of file mesh_triangle_support.h.

References _center, _n_points, _radius, and libMesh::pi.

  {
    // The nth point lies at the angle theta = 2 * pi * n / _n_points
    const Real theta = static_cast<Real>(n) * 2.0 * libMesh::pi / static_cast<Real>(_n_points);
        
    return Point(_center(0) + _radius*std::cos(theta), // x=r*cos(theta)
                 _center(1) + _radius*std::sin(theta), // y=r*sin(theta)
                 0.);
  }