This example shows how to to create graph from scratch and how to set some of node and edge attributes.
The program produces the following graph:
1 #pragma package ".." 2 #include "chagraph.h" 3 #include <stdlib.h> 4 5 int main(int argc, char *argv[]) 6 { 7 Agraph_t *g; 8 Agnode_t *n; 9 Agnode_t *m; 10 Agedge_t *e; 11 12 g = agopen("g", Agdirected, 0); 13 14 agattr(g, AGNODE, "shape", ""); 15 agattr(g, AGNODE, "color", ""); 16 agattr(g, AGNODE, "style", ""); 17 agattr(g, AGNODE, "peripheries", ""); 18 agattr(g, AGNODE, "label", ""); 19 agattr(g, AGEDGE, "style", ""); 20 agattr(g, AGEDGE, "weight", ""); 21 agattr(g, AGEDGE, "dir", ""); 22 23 n = agnode(g, "a", TRUE); 24 agset(n, "shape", "hexagon"); 25 agset(n, "color", "red"); 26 27 m = agnode(g, "b", TRUE); 28 agset(m, "style", "filled"); 29 30 e = agedge(n,m, "e1", TRUE); 31 agset(e, "weight", "8"); 32 33 m = agnode(g, "c", TRUE); 34 agset(m, "label", "Node c"); 35 agset(m, "shape", "polygon"); 36 agset(m, "peripheries", "2"); 37 38 e = agedge(n,m, "e2", TRUE); 39 agset(e, "style", "dotted"); 40 agset(e, "dir", "back"); 41 42 FILE *outf = fopen(argv[1], "w"); 43 agwrite(g, outf); 44 45 agclose(g); 46 return 0; 47 }