VectorField_2 Concept Reference

Definition

The concept VectorField_2 describes the set of requirements for the first template parameter of the class CGAL::Stream_lines_2<VectorField_2,Integrator_2>. This concept provides the types of the geometric primitives used in the placement of streamlines and some functions for answering different queries.

Has models

CGAL::Regular_grid_2<StreamLinesTraits_2>

CGAL::Triangular_field_2<StreamLinesTraits_2>

Types
typedef unspecified_type	Geom_traits
	The traits class.
typedef unspecified_type	FT
	The scalar type.
typedef unspecified_type	Point_2
	The point type.
typedef unspecified_type	Vector_2
	The vector type.

Creation
	VectorField_2 ()
	Any constructor has to allow the user to fill the vector values, i.e., assign a vector to each position within the domain.

Query Functions
Geom_traits::Iso_rectangle_2	bbox ()
	returns the bounding box of the whole domain.
std::pair< Vector_2, FT >	get_field (Point_2 p)
	returns the vector field value and the local density.
bool	is_in_domain (Point_2 p)
	returns true if the point p is inside the domain boundaries, false otherwise.
FT	get_integration_step (Point_2 p)
	returns the integration step at the point p, i.e., the distance between p and the next point in the polyline.

Member Function Documentation

get_field()

std::pair< Vector_2, FT > VectorField_2::get_field

(

Point_2

p

)

returns the vector field value and the local density.

Precondition

is_in_domain(p) must be true.

get_integration_step()

FT VectorField_2::get_integration_step

(

Point_2

p

)

returns the integration step at the point p, i.e., the distance between p and the next point in the polyline.

Precondition

is_in_domain(p) must be true.