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/// @file
/// @brief small example, demonstrates usage of @ref agopen, @ref agnode,
/// @ref agedge, @ref agsafeset and @ref agwrite
#include <graphviz/gvc.h>
#include <stdio.h>
#include <stdlib.h>
#define NO_LAYOUT_OR_RENDERING
int main(void) {
#ifndef NO_LAYOUT_OR_RENDERING
// set up a graphviz context - but only once even for multiple graphs
GVC_t *gvc = gvContext();
#endif
// Create a simple digraph
Agraph_t *g = agopen("g", Agdirected, 0);
Agnode_t *n = agnode(g, "n", 1);
Agnode_t *m = agnode(g, "m", 1);
(void)agedge(g, n, m, 0, 1);
// Set an attribute - in this case one that affects the visible rendering
agsafeset(n, "color", "red", "");
#ifdef NO_LAYOUT_OR_RENDERING
// Just write the graph without layout
agwrite(g, stdout);
#else
// Use the directed graph layout engine
gvLayout(gvc, g, "dot");
// Output in .dot format
gvRender(gvc, g, "dot", stdout);
gvFreeLayout(gvc, g);
#endif
agclose(g);
return EXIT_SUCCESS;
}
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