double position_x; /* positive value: negative means undefined */
double position_y; /* positive value: negative means undefined */
void *data; /* user data */
- void *xbtdata; /* private xbt data: should be reinitialized at the
- beginning of your algorithm if you need to use it */
} s_xbt_node_t;
/* edge structure */
xbt_node_t src;
xbt_node_t dst;
void *data; /* user data */
- void *xbtdata; /* private xbt data: should be reinitialized at the
- beginning of your algorithm if you need to use it */
- double length; /* positive value: negative means undefined */
} s_xbt_edge_t;
/* Graph structure */
xbt_dynar_t edges;
unsigned short int directed;
void *data; /* user data */
- void *xbtdata; /* private xbt data: should be reinitialized at the
- beginning of your algorithm if you need to use it */
} s_xbt_graph_t;
/* API */
XBT_PUBLIC(xbt_edge_t) xbt_graph_get_edge(xbt_graph_t g, xbt_node_t src, xbt_node_t dst);
-XBT_PUBLIC(void) xbt_graph_edge_set_length(xbt_edge_t e, double length);
-XBT_PUBLIC(double) xbt_graph_edge_get_length(xbt_edge_t e);
-
XBT_PUBLIC(void) xbt_graph_free_graph(xbt_graph_t g,
void_f_pvoid_t node_free_function, void_f_pvoid_t edge_free_function, void_f_pvoid_t graph_free_function);
XBT_PUBLIC(xbt_node_t) xbt_graph_edge_get_source(xbt_edge_t e);
XBT_PUBLIC(xbt_node_t) xbt_graph_edge_get_target(xbt_edge_t e);
-XBT_PUBLIC(void)
-xbt_graph_export_graphviz(xbt_graph_t g, const char* filename, const char*(node_name)(xbt_node_t n),
- const char*(edge_name)(xbt_edge_t e));
-
SG_END_DECL()
#endif /* XBT_GRAPH_H */
/** @} */
#include "xbt/sysdep.h"
#include "xbt/log.h"
#include "xbt/graph.h"
-#include "graph_private.h"
#include "xbt/dict.h"
#include <errno.h>
{
return n->out;
}
-
-/** @brief Set the weight of the given edge */
-void xbt_graph_edge_set_length(xbt_edge_t e, double length)
-{
- e->length = length;
-
-}
-
-/** @brief Get the length of a edge */
-double xbt_graph_edge_get_length(xbt_edge_t edge)
-{
- return edge->length;
-}
-
-/** @brief Floyd-Warshall algorithm for shortest path finding
- *
- * From wikipedia:
- *
- * The Floyd-Warshall algorithm takes as input an adjacency matrix representation of a weighted, directed graph (V, E).
- * The weight of a path between two vertices is the sum of the weights of the edges along that path. The edges E of the
- * graph may have negative weights, but the graph must not have any negative weight cycles. The algorithm computes, for
- * each pair of vertices, the minimum weight among all paths between the two vertices. The running time complexity is
- * Θ(|V|3).
- */
-void xbt_floyd_algorithm(xbt_graph_t g, double *adj, double *d, xbt_node_t * p)
-{
- unsigned long i;
- unsigned long j;
- unsigned long k;
- unsigned long n = xbt_dynar_length(g->nodes);
-
- for (i = 0; i < n * n; i++) {
- d[i] = adj[i];
- }
-
- for (i = 0; i < n; i++) {
- for (j = 0; j < n; j++) {
- if (d[i*n+j] > -1) {
- p[i*n+j] = *((xbt_node_t *) xbt_dynar_get_ptr(g->nodes, i));
- }
- }
- }
-
- for (k = 0; k < n; k++) {
- for (i = 0; i < n; i++) {
- for (j = 0; j < n; j++) {
- if (d[i * n + k] > -1 && d[k * n + j] > -1 &&
- (d[i * n + j] < 0 || d[i * n + j] > d[i * n + k] + d[k * n + j])) {
- d[i * n + j] = d[i * n + k] + d[k * n + j];
- p[i * n + j] = p[k * n + j];
- }
- }
- }
- }
-}
-
-/** @brief Export the given graph in the GraphViz formatting for visualization */
-void xbt_graph_export_graphviz(xbt_graph_t g, const char *filename, const char *(node_name) (xbt_node_t),
- const char *(edge_name) (xbt_edge_t))
-{
- unsigned int cursor = 0;
- xbt_node_t node = NULL;
- xbt_edge_t edge = NULL;
- const char *name = NULL;
-
- FILE *file = fopen(filename, "w");
- xbt_assert(file, "Failed to open %s \n", filename);
-
- if (g->directed)
- fprintf(file, "digraph test {\n");
- else
- fprintf(file, "graph test {\n");
-
- fprintf(file, " graph [overlap=scale]\n");
-
- fprintf(file, " node [shape=box, style=filled]\n");
- fprintf(file, " node [width=.3, height=.3, style=filled, color=skyblue]\n\n");
-
- xbt_dynar_foreach(g->nodes, cursor, node) {
- if (node_name){
- fprintf(file, " \"%s\";\n", node_name(node));
- }else{
- fprintf(file, " \"%p\";\n", node);
- }
- }
- xbt_dynar_foreach(g->edges, cursor, edge) {
- const char *c;
- const char *c_dir = "->";
- const char *c_ndir = "--";
- if (g->directed){
- c = c_dir;
- }else{
- c = c_ndir;
- }
- if (node_name){
- const char *src_name = node_name(edge->src);
- const char *dst_name = node_name(edge->dst);
- fprintf(file, " \"%s\" %s \"%s\"", src_name, c, dst_name);
- }else{
- fprintf(file, " \"%p\" %s \"%p\"", edge->src, c, edge->dst);
- }
-
- if (edge_name){
- name = edge_name(edge);
- if (name)
- fprintf(file, "[label=\"%s\"]", name);
- }
- fprintf(file, ";\n");
- }
- fprintf(file, "}\n");
- fclose(file);
-}
