P2trCDT* p2tr_cdt_new (P2tCDT *cdt)
{
P2tTrianglePtrArray cdt_tris = p2t_cdt_get_triangles (cdt);
GHashTable *point_map = g_hash_table_new (g_direct_hash, g_direct_equal);
P2trCDT *rmesh = g_slice_new (P2trCDT);
gint i, j;
rmesh->mesh = p2tr_mesh_new ();
rmesh->outline = p2tr_pslg_new ();
/* First iteration over the CDT - create all the points */
for (i = 0; i < cdt_tris->len; i++)
{
P2tTriangle *cdt_tri = triangle_index (cdt_tris, i);
for (j = 0; j < 3; j++)
{
P2tPoint *cdt_pt = p2t_triangle_get_point(cdt_tri, j);
P2trPoint *new_pt = g_hash_table_lookup (point_map, cdt_pt);
if (new_pt == NULL)
{
new_pt = p2tr_point_new2 (cdt_pt->x, cdt_pt->y);
g_hash_table_insert (point_map, cdt_pt, new_pt);
}
}
}
/* Second iteration over the CDT - create all the edges and find the
* outline */
for (i = 0; i < cdt_tris->len; i++)
{
P2tTriangle *cdt_tri = triangle_index (cdt_tris, i);
for (j = 0; j < 3; j++)
{
P2tPoint *start = p2t_triangle_get_point (cdt_tri, j);
P2tPoint *end = p2t_triangle_get_point (cdt_tri, (j + 1) % 3);
int edge_index = p2t_triangle_edge_index (cdt_tri, start, end);
P2trPoint *start_new = g_hash_table_lookup (point_map, start);
P2trPoint *end_new = g_hash_table_lookup (point_map, end);
if (! p2tr_point_has_edge_to (start_new, end_new))
{
gboolean constrained = cdt_tri->constrained_edge[edge_index];
P2trEdge *edge = p2tr_mesh_new_edge (rmesh->mesh, start_new, end_new, constrained);
/* If the edge is constrained, we should add it to the
* outline */
if (constrained)
p2tr_pslg_add_new_line(rmesh->outline, &start_new->c,
&end_new->c);
/* We only wanted to create the edge now. We will use it
* later */
p2tr_edge_unref (edge);
}
}
}
/* Third iteration over the CDT - create all the triangles */
for (i = 0; i < cdt_tris->len; i++)
{
P2tTriangle *cdt_tri = triangle_index (cdt_tris, i);
P2trPoint *pt1 = g_hash_table_lookup (point_map, p2t_triangle_get_point (cdt_tri, 0));
P2trPoint *pt2 = g_hash_table_lookup (point_map, p2t_triangle_get_point (cdt_tri, 1));
P2trPoint *pt3 = g_hash_table_lookup (point_map, p2t_triangle_get_point (cdt_tri, 2));
P2trTriangle *new_tri = p2tr_mesh_new_triangle (rmesh->mesh,
p2tr_point_get_edge_to(pt1, pt2),
p2tr_point_get_edge_to(pt2, pt3),
p2tr_point_get_edge_to(pt3, pt1));
/* We won't do any usage of the triangle, so just unref it */
p2tr_triangle_unref (new_tri);
}
return rmesh;
}
P2trCDT*
p2tr_cdt_new (P2tCDT *cdt)
{
P2tTrianglePtrArray cdt_tris = p2t_cdt_get_triangles (cdt);
GHashTable *point_map = g_hash_table_new (g_direct_hash, g_direct_equal);
P2trCDT *rmesh = g_slice_new (P2trCDT);
GHashTableIter iter;
P2trPoint *pt_iter = NULL;
P2trVEdgeSet *new_edges = p2tr_vedge_set_new ();
guint i, j;
rmesh->mesh = p2tr_mesh_new ();
rmesh->outline = p2tr_pslg_new ();
/* First iteration over the CDT - create all the points */
for (i = 0; i < cdt_tris->len; i++)
{
P2tTriangle *cdt_tri = triangle_index (cdt_tris, i);
for (j = 0; j < 3; j++)
{
P2tPoint *cdt_pt = p2t_triangle_get_point(cdt_tri, j);
P2trPoint *new_pt = (P2trPoint*) g_hash_table_lookup (point_map, cdt_pt);
if (new_pt == NULL)
{
new_pt = p2tr_mesh_new_point2 (rmesh->mesh, cdt_pt->x, cdt_pt->y);
g_hash_table_insert (point_map, cdt_pt, new_pt);
}
}
}
/* Second iteration over the CDT - create all the edges and find the
* outline */
for (i = 0; i < cdt_tris->len; i++)
{
P2tTriangle *cdt_tri = triangle_index (cdt_tris, i);
for (j = 0; j < 3; j++)
{
P2tPoint *start = p2t_triangle_get_point (cdt_tri, j);
P2tPoint *end = p2t_triangle_get_point (cdt_tri, (j + 1) % 3);
int edge_index = p2t_triangle_edge_index (cdt_tri, start, end);
P2trPoint *start_new = (P2trPoint*) g_hash_table_lookup (point_map, start);
P2trPoint *end_new = (P2trPoint*) g_hash_table_lookup (point_map, end);
if (! p2tr_point_has_edge_to (start_new, end_new))
{
gboolean constrained = cdt_tri->constrained_edge[edge_index]
|| cdt_tri->neighbors_[edge_index] == NULL;
P2trEdge *edge = p2tr_mesh_new_edge (rmesh->mesh, start_new, end_new, constrained);
/* If the edge is constrained, we should add it to the
* outline */
if (constrained)
p2tr_pslg_add_new_line(rmesh->outline, &start_new->c,
&end_new->c);
/* We only wanted to create the edge now. We will use it
* later */
p2tr_vedge_set_add (new_edges, edge);
}
}
}
/* Third iteration over the CDT - create all the triangles */
for (i = 0; i < cdt_tris->len; i++)
{
P2tTriangle *cdt_tri = triangle_index (cdt_tris, i);
P2trPoint *pt1 = (P2trPoint*) g_hash_table_lookup (point_map, p2t_triangle_get_point (cdt_tri, 0));
P2trPoint *pt2 = (P2trPoint*) g_hash_table_lookup (point_map, p2t_triangle_get_point (cdt_tri, 1));
P2trPoint *pt3 = (P2trPoint*) g_hash_table_lookup (point_map, p2t_triangle_get_point (cdt_tri, 2));
P2trTriangle *new_tri = p2tr_mesh_new_triangle (rmesh->mesh,
p2tr_point_get_edge_to(pt1, pt2, FALSE),
p2tr_point_get_edge_to(pt2, pt3, FALSE),
p2tr_point_get_edge_to(pt3, pt1, FALSE));
/* We won't do any usage of the triangle, so just unref it */
p2tr_triangle_unref (new_tri);
}
/* And do an extra flip fix */
p2tr_cdt_flip_fix (rmesh, new_edges);
p2tr_vedge_set_free (new_edges);
/* Now finally unref the points we added into the map */
g_hash_table_iter_init (&iter, point_map);
while (g_hash_table_iter_next (&iter, NULL, (gpointer*)&pt_iter))
p2tr_point_unref (pt_iter);
g_hash_table_destroy (point_map);
return rmesh;
}