/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
tb_bool_t gb_tessellator_mesh_make(gb_tessellator_impl_t* impl, gb_polygon_ref_t polygon)
{
// check
tb_assert(impl && polygon);
// the points
gb_point_ref_t points = polygon->points;
tb_uint16_t const* counts = polygon->counts;
tb_assert_and_check_return_val(points && counts, tb_false);
// not exists mesh?
if (!impl->mesh)
{
// init func
tb_element_t edge_element = tb_element_mem(sizeof(gb_tessellator_edge_t), tb_null, tb_null);
tb_element_t face_element = tb_element_mem(sizeof(gb_tessellator_face_t), tb_null, tb_null);
tb_element_t vertex_element = tb_element_mem(sizeof(gb_tessellator_vertex_t), tb_null, tb_null);
#ifdef __gb_debug__
// init func cstr for gb_mesh_dump
edge_element.cstr = gb_tessellator_edge_cstr;
face_element.cstr = gb_tessellator_face_cstr;
vertex_element.cstr = gb_tessellator_vertex_cstr;
#endif
// init mesh
impl->mesh = gb_mesh_init(edge_element, face_element, vertex_element);
/* init the order
*
* the new edges/faces/vertice will be inserted to the head of list
*/
gb_mesh_edge_order_set(impl->mesh, GB_MESH_ORDER_INSERT_HEAD);
gb_mesh_face_order_set(impl->mesh, GB_MESH_ORDER_INSERT_HEAD);
gb_mesh_vertex_order_set(impl->mesh, GB_MESH_ORDER_INSERT_HEAD);
// init listener
gb_mesh_listener_set(impl->mesh, gb_tessellator_listener, impl->mesh);
gb_mesh_listener_event_add(impl->mesh, GB_MESH_EVENT_FACE_SPLIT | GB_MESH_EVENT_EDGE_SPLIT);
}
// check
gb_mesh_ref_t mesh = impl->mesh;
tb_assert_and_check_return_val(mesh, tb_false);
// clear mesh first
gb_mesh_clear(mesh);
// done
gb_point_ref_t point = tb_null;
tb_uint16_t count = *counts++;
tb_size_t index = 0;
gb_mesh_edge_ref_t edge = tb_null;
gb_mesh_edge_ref_t edge_first = tb_null;
while (index < count)
{
// the point
point = points++;
// first point?
if (!index)
{
// must be closed contour
tb_assertf(gb_point_eq(point, point + count - 1), "this contour(%lu: %{point} => %{point}) is not closed!", count, point, point + count - 1);
// clear the edge
edge = tb_null;
// clear the first edge
edge_first = tb_null;
// trace
tb_trace_d("move_to: %{point}", point);
}
// closed?
else if (index + 1 == count)
{
// trace
tb_trace_d("closed: %{point}", point);
// connect an edge to the first edge
edge = gb_mesh_edge_connect(mesh, edge, edge_first);
// init edge.faces.inside
gb_tessellator_face_inside_set(gb_mesh_edge_lface(edge), 0);
gb_tessellator_face_inside_set(gb_mesh_edge_rface(edge), 0);
}
else
{
// trace
tb_trace_d("line_to: %{point}", point);
// exists the first edge?
if (edge_first)
{
// append an edge
edge = gb_mesh_edge_append(mesh, edge);
}
else
{
// make a new non-loop edge
edge = gb_mesh_edge_make(mesh);
// save the first edge
edge_first = edge;
}
}
// has new edge?
if (edge)
{
// init edge.winding
gb_tessellator_edge_winding_set(edge, 1);
gb_tessellator_edge_winding_set(gb_mesh_edge_sym(edge), -1);
// init edge.region
gb_tessellator_edge_region_set(edge, tb_null);
gb_tessellator_edge_region_set(gb_mesh_edge_sym(edge), tb_null);
// init edge.dst
gb_tessellator_vertex_point_set(gb_mesh_edge_dst(edge), point);
}
// next point
index++;
// next polygon
if (index == count)
{
// next
count = *counts++;
index = 0;
}
}
#ifdef __gb_debug__
// check mesh
gb_mesh_check(mesh);
#endif
// ok?
return !gb_mesh_is_empty(mesh);
}
static tb_void_t gb_demo_utils_mesh_radiation()
{
// trace
tb_trace_i("==========================================================================");
// init mesh
gb_mesh_ref_t mesh = gb_mesh_init(tb_element_str(tb_true), tb_element_str(tb_true), tb_element_str(tb_true));
if (mesh)
{
// init listener
gb_mesh_listener_set(mesh, gb_demo_utils_mesh_listener, mesh);
gb_mesh_listener_event_add(mesh, GB_MESH_EVENT_FACE_MERGE | GB_MESH_EVENT_FACE_SPLIT | GB_MESH_EVENT_EDGE_MERGE | GB_MESH_EVENT_EDGE_SPLIT);
// make a edge
gb_mesh_edge_ref_t edge1 = gb_mesh_edge_make(mesh);
if (edge1)
{
// the face
gb_mesh_face_ref_t face = gb_mesh_edge_lface(edge1);
tb_assert_abort(face == gb_mesh_edge_rface(edge1));
// save face name
gb_mesh_face_data_set(mesh, face, "face");
/* make a radiation
*
* v4
* / \
* |
* |
* | e4
* |
* |
* |
* <---------------- v0 ---------------->
* v1 e1 | e3 v3
* |
* |
* | e2
* |
* |
* \ /
* v2
*/
gb_mesh_edge_ref_t edge2 = gb_mesh_edge_append(mesh, gb_mesh_edge_sym(edge1));
gb_mesh_edge_ref_t edge3 = gb_mesh_edge_append(mesh, gb_mesh_edge_sym(edge1));
gb_mesh_edge_ref_t edge4 = gb_mesh_edge_append(mesh, gb_mesh_edge_sym(edge1));
// save edge name
gb_mesh_edge_data_set(mesh, edge1, "e1");
gb_mesh_edge_data_set(mesh, edge2, "e2");
gb_mesh_edge_data_set(mesh, edge3, "e3");
gb_mesh_edge_data_set(mesh, edge4, "e4");
// save vertex name
gb_mesh_vertex_data_set(mesh, gb_mesh_edge_org(edge1), "v0");
gb_mesh_vertex_data_set(mesh, gb_mesh_edge_dst(edge1), "v1");
gb_mesh_vertex_data_set(mesh, gb_mesh_edge_dst(edge2), "v2");
gb_mesh_vertex_data_set(mesh, gb_mesh_edge_dst(edge3), "v3");
gb_mesh_vertex_data_set(mesh, gb_mesh_edge_dst(edge4), "v4");
#ifdef __gb_debug__
// trace
tb_trace_i("");
tb_trace_i("radiation: make");
// check mesh
gb_mesh_check(mesh);
// dump mesh
gb_mesh_dump(mesh);
#endif
/* remove one
*
* v4
* / \
* |
* |
* | e4
* |
* |
* |
* v0 ---------------->
* | e3 v3
* |
* |
* | e2
* |
* |
* \ /
* v2
*/
gb_mesh_edge_remove(mesh, edge1);
#ifdef __gb_debug__
// trace
tb_trace_i("");
tb_trace_i("radiation: kill");
// check mesh
gb_mesh_check(mesh);
// dump mesh
gb_mesh_dump(mesh);
#endif
// remove all
gb_mesh_edge_remove(mesh, edge2);
gb_mesh_edge_remove(mesh, edge3);
gb_mesh_edge_remove(mesh, edge4);
// check
tb_assert_abort(gb_mesh_is_empty(mesh));
}
// exit mesh
gb_mesh_exit(mesh);
}
}