Add example using the pack library

diff --git a/dot.demo/neatopack.c b/dot.demo/neatopack.c
new file mode 100644 (file)
index 0000000..57cc5ba
--- /dev/null
+++ b/dot.demo/neatopack.c
@@ -0,0 +1,57 @@
+/* vim:set shiftwidth=4 ts=8: */
+
+/**********************************************************
+*      This software is part of the graphviz package      *
+*                http://www.graphviz.org/                 *
+*                                                         *
+*            Copyright (c) 1994-2004 AT&T Corp.           *
+*                and is licensed under the                *
+*            Common Public License, Version 1.0           *
+*                      by AT&T Corp.                      *
+*                                                         *
+*        Information and Software Systems Research        *
+*              AT&T Research, Florham Park NJ             *
+**********************************************************/
+
+#include <gvc.h>
+#include <pack.h>
+
+int main (int argc, char* argv[])
+{
+    graph_t *g;
+    graph_t *sg;
+    FILE *fp;
+    graph_t** cc;
+    int       i, ncc;
+    GVC_t *gvc;
+
+    gvc = gvContext();
+
+    if (argc > 1)
+        fp = fopen(argv[1], "r");
+    else
+        fp = stdin;
+    g = agread(fp);
+
+    cc = ccomps(g, &ncc, (char*)0);
+
+    for (i = 0; i < ncc; i++) {
+        sg = cc[i];
+        nodeInduce (sg);
+        gvLayout(gvc, sg, "neato");
+    }
+    pack_graph (ncc, cc, g, 0);
+
+    gvRender(gvc, g, "ps", stdout);
+
+    for (i = 0; i < ncc; i++) {
+        sg = cc[i];
+        gvFreeLayout(gvc, sg);
+        agdelete(g, sg);
+    }
+
+    agclose(g);
+
+    return (gvFreeContext(gvc));
+
+}