Edges

Details

GTS_EDGE_CLASS()

#define     GTS_EDGE_CLASS(klass)

Casts klass to GtsEdgeClass.

klass :

a descendant of GtsObjectClass.

GTS_EDGE()

#define     GTS_EDGE(obj)

Casts obj to GtsEdge.

obj :

a descendant of GtsObject.

GTS_IS_EDGE()

#define     GTS_IS_EDGE(obj)

Evaluates to TRUE if obj is a GtsEdge, FALSE otherwise.

obj :

a pointer to test.

struct GtsEdgeClass

struct GtsEdgeClass {

  GtsSegmentClass parent_class;
};

The edge class. No virtual function associated.

struct GtsEdge

struct GtsEdge {

  GtsSegment segment;

  GSList * triangles;
};

The edge object.

GtsSegment `segment`	The parent object.
GSList *`triangles`	List of GtsTriangle using this edge.

gts_edge_class ()

GtsEdgeClass* gts_edge_class                (void);

Returns :

the GtsEdgeClass.

gts_edge_new ()

GtsEdge*    gts_edge_new                    (GtsEdgeClass *klass,
                                             GtsVertex *v1,
                                             GtsVertex *v2);

`klass` :	a GtsEdgeClass.
`v1` :	a GtsVertex.
`v2` :	a GtsVertex.
Returns :	a new GtsEdge linking `v1` and `v2`.

gts_edge_replace ()

void        gts_edge_replace                (GtsEdge *e,
                                             GtsEdge *with);

Replaces e with with. For each triangle which uses e as an edge, e is replaced with with. The with->triangles list is updated appropriately and the e->triangles list is freed and set to NULL.

`e` :	a GtsEdge.
`with` :	a GtsEdge.

gts_edge_is_unattached()

#define       gts_edge_is_unattached(s) ((s)->triangles == NULL ? TRUE : FALSE)

Evaluates to TRUE if no triangles uses s as an edge, FALSE otherwise.

s :

a GtsEdge.

gts_edge_is_duplicate ()

GtsEdge*    gts_edge_is_duplicate           (GtsEdge *e);

`e` :	a GtsEdge.
Returns :	the first GtsEdge different from `e` which shares the same endpoints or `NULL` if there is none.

gts_edge_has_parent_surface ()

GtsFace*    gts_edge_has_parent_surface     (GtsEdge *e,
                                             GtsSurface *surface);

`e` :	a GtsEdge.
`surface` :	a GtsSurface.
Returns :	a GtsFace of `surface` having `e` as an edge, `NULL` otherwise.

gts_edge_has_any_parent_surface ()

GtsFace*    gts_edge_has_any_parent_surface (GtsEdge *e);

`e` :	a GtsEdge.
Returns :	`NULL` if `e` is not an edge of any triangle or if all the faces having `e` has an edge do not belong to any surface, a GtsFace belonging to a surface and having `e` as an edge.

gts_edge_is_boundary ()

GtsFace*    gts_edge_is_boundary            (GtsEdge *e,
                                             GtsSurface *surface);

`e` :	a GtsEdge.
`surface` :	a GtsSurface or `NULL`.
Returns :	the unique GtsFace (which belongs to `surface`) and which has `e` as an edge (i.e. `e` is a boundary edge (of `surface`)) or `NULL` if there is more than one or no faces (belonging to `surface`) and with `e` as an edge.

gts_edge_is_contact ()

guint       gts_edge_is_contact             (GtsEdge *e);

`e` :	a GtsEdge.
Returns :	the number of sets of connected triangles sharing `e` as a contact edge.

gts_edge_belongs_to_tetrahedron ()

gboolean    gts_edge_belongs_to_tetrahedron (GtsEdge *e);

`e` :	a GtsEdge.
Returns :	`TRUE` if `e` is used by faces forming a tetrahedron, `FALSE` otherwise.

gts_edge_face_number ()

guint       gts_edge_face_number            (GtsEdge *e,
                                             GtsSurface *s);

`e` :	a GtsEdge.
`s` :	a GtsSurface.
Returns :	the number of faces using `e` and belonging to `s`.

gts_edge_manifold_faces ()

gboolean    gts_edge_manifold_faces         (GtsEdge *e,
                                             GtsSurface *s,
                                             GtsFace **f1,
                                             GtsFace **f2);

If e is a manifold edge of surface s, fills f1 and f2 with the faces belonging to s and sharing e.

`e` :	a GtsEdge.
`s` :	a GtsSurface.
`f1` :	pointer for first face.
`f2` :	pointer for second face.
Returns :	`TRUE` if `e` is a manifold edge, `FALSE` otherwise.

GtsEncroachFunc ()

gboolean    (*GtsEncroachFunc)              (GtsVertex *v,
                                             GtsEdge *e,
                                             GtsSurface *s,
                                             gpointer data);

`v` :
`e` :
`s` :
`data` :
Returns :

gts_edge_is_encroached ()

GtsVertex*  gts_edge_is_encroached          (GtsEdge *e,
                                             GtsSurface *s,
                                             GtsEncroachFunc encroaches,
                                             gpointer data);

`e` :	a GtsEdge.
`s` :	a GtsSurface describing a (constrained) Delaunay triangulation.
`encroaches` :	a GtsEncroachFunc.
`data` :	user data to be passed to `encroaches`.
Returns :	a GtsVertex belonging to `s` and encroaching upon `e` (as defined by `encroaches`) or `NULL` if there is none.

gts_edges_merge ()

GList*      gts_edges_merge                 (GList *edges);

For each edge in edges check if it is duplicated (as returned by gts_edge_is_duplicate()). If it is replace it by its duplicate, destroy it and remove it from the list.

`edges` :	a list of GtsEdge.
Returns :	the updated `edges` list.

gts_edges_from_vertices ()

GSList*     gts_edges_from_vertices         (GSList *vertices,
                                             GtsSurface *parent);

`vertices` :	a list of GtsVertex.
`parent` :	a GtsSurface.
Returns :	a list of unique GtsEdge which have one of their vertices in `vertices` and are used by a face of `parent`.

gts_edge_swap ()

void        gts_edge_swap                   (GtsEdge *e,
                                             GtsSurface *s);

Performs an "edge swap" on the two triangles sharing e and belonging to s.

`e` :	a GtsEdge.
`s` :	a GtsSurface.