Types

Alpha_shape_face_base<Df>::Interval_3
	A container type to get (and put) the three special values ($$1, 2, 3) associated with an alpha shape edge.
Alpha_shape_face_base<Df>::Coord_type
	A type to hold a coordinate type class. 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. Precondition: Let's us precise that Coord_type has to be the same as the one used by Gt, already used by the underlying triangulation Dt, and by her face base Df.

Creation

Alpha_shape_face_base<Df> f;
	default constructor.
Alpha_shape_face_base<Df> f ( void* v0, void* v1, void* v2);
	constructor setting the incident vertices.
Alpha_shape_face_base<Df> f ( void* v0, void* v1, void* v2, void* n0, void* n1, void* n2);
	constructor setting the incident vertices and the neighboring faces.

Access Functions

Interval_3[3]	f.get_ranges ()	returns a vector V, in which, for each edge $$i, V[i] contains three alpha values $$1 2 3, such as for $$ under $$3, the edge is attached but singular, for $$ under $$2, the face is regular, and for $$ under $$1, the edge is interior.
Coord_type	f.get_alpha ()	return the alpha value, under which the alpha shape contains the face.

Modifiers

void	f.set_ranges ( Interval_3[3] V)
		sets the vector V, in which, for each edge $$i, V[i] contains three alpha values $$1 2 3, such as for $$ under $$3, the edge is attached but singular, for $$ under $$2, the face is regular, and for $$ under $$1, the edge is interior.
void	f.set_alpha ( Coord_type A)
		sets the alpha value, under which the alpha shape contains the face.