/**
* \brief Builds a collection of vertices representing a given polygon as a
* collection of triangles.
* \param v The vertices of the polygon to convert.
*/
bear::visual::gl_state::position_vector
bear::visual::gl_state::polygon_to_triangles( const position_vector& v ) const
{
CLAW_PRECOND( v.size() >= 3 );
position_vector result;
result.reserve( 3 * (v.size() - 2) );
const position_vector::const_iterator root_vertex( v.begin() );
position_vector::const_iterator first_vertex( root_vertex + 1 );
position_vector::const_iterator second_vertex( root_vertex + 2 );
do
{
result.push_back( *root_vertex );
result.push_back( *first_vertex );
result.push_back( *second_vertex );
++first_vertex;
++second_vertex;
}
while ( second_vertex != v.end() );
return result;
} // gl_state::polygon_to_triangles()
/*
* 深度优先搜索遍历图的递归实现
*/
static void DFS(Graph G, int i, int *visited)
{
int w;
visited[i] = 1;
printf("%c ", G.vexs[i]);
// 遍历该顶点的所有邻接顶点。若是没有访问过，那么继续往下走
for (w = first_vertex(G, i); w >= 0; w = next_vertix(G, i, w))
{
if (!visited[w])
DFS(G, w, visited);
}
}
int main(int argc, char const* argv[]) {
if (argc < 2) {
std::cout << "usage: " << argv[0] << " num_vertices < input\n";
return EXIT_FAILURE;
}
unsigned int num_vertices = boost::lexical_cast<unsigned int>(argv[1]);
std::istream_iterator<unsigned int> first_vertex(std::cin), last_vertex;
boost::directed_graph<> graph;
build_graph(graph, num_vertices, first_vertex, last_vertex);
cycle_printer<std::ostream> visitor(std::cout);
boost::hawick_circuits(graph, visitor);
return EXIT_SUCCESS;
}
/*
* 广度优先搜索（类似于树的层次遍历）
*/
void BFS(Graph G)
{
int head = 0;
int rear = 0;
int queue[MAX]; // 辅组队列
int visited[MAX]; // 顶点访问标记
int i, j, k;
for (i = 0; i < G.vexnum; i++)
visited[i] = 0;
printf("BFS: ");
for (i = 0; i < G.vexnum; i++)
{
if (!visited[i])
{
visited[i] = 1;
printf("%c ", G.vexs[i]);
queue[rear++] = i; // 入队列
}
while (head != rear)
{
j = queue[head++]; // 出队列
for (k = first_vertex(G, j); k >= 0; k = next_vertix(G, j, k)) //k是为访问的邻接顶点
{
if (!visited[k])
{
visited[k] = 1;
printf("%c ", G.vexs[k]);
queue[rear++] = k;
}
}
}
}
printf("\n");
}
static void ant_rlf(gcp_solution_t *sol, gcp_t *problem) {/*{{{*/
int i, j;
int colornumber = 0; /* number of colors used */
int colored = 0; /* number of colored vertex */
int v, new_v; /* vertex to be colored */
int nn; /* keep number of non-neighbors of v */
double *probb; /* probabilities for choosing a vertex */
/*{{{*/
static int *degree = NULL;
static int **adj = NULL;
static int *ctr = NULL;
if (!ctr) {
degree = malloc_(sizeof(int) * problem->size);
adj = malloc_(sizeof(int*) * problem->size);
}
for (i = 0; i < problem->size; i++) {
degree[i] = problem->degree[i];
if (!ctr) {
adj[i] = malloc(sizeof(int) * problem->size);
}
for (j = 0; j < problem->size; j++) {
adj[i][j] = problem->adj[i][j];
// adj[j][i] = problem->adj[j][i];
}
}
ctr = degree;
/*}}}*/
while (colored < problem->size) {
v = first_vertex(degree, problem->size);
sol->color[v] = colornumber;
sol->nodes_color[colornumber]++;
colored++;
nn = problem->size - degree[v] - 1;
for (i = 0; i < problem->size; i++) {
if (!adj[v][i] && (degree[i] == OUT)) {
nn--;
}
}
while (nn > 0) {
/* choose new_v, non neighbor of v that is not OUT with probability p */
/*
probb = calculate_probbs(v, problem->size, colornumber, degree,
adj, sol->color, problem->alpha, problem->beta);
new_v = choose_vertex(probb, problem->size);
*/
new_v = 0;
while (v==new_v || (degree[new_v]==OUT) || adj[new_v][v]) new_v++;
for (i = new_v; i < problem->size; i++) {
if ((i != v) && !adj[v][i] && (degree[i] != OUT) && (degree[i] > degree[new_v]))
new_v = i;
}
sol->color[new_v] = colornumber;
sol->nodes_color[colornumber]++;
colored++;
contract(v, new_v, degree, adj, problem->size, &nn);
nn--;
}
remove_(v, degree, adj, problem->size);
colornumber++;
}
sol->spent_time = current_usertime_secs();
sol->ncolors = colornumber;
}/*}}}*/