/// <summary>
/// Generate a png containing the graph specified
/// </summary>
/// <remarks>
/// In order to work, this method requires you to have graphviz software installed on your system and "dot.exe" program available on you path.
/// If this is not satisfied, nothing will be done.
/// </remarks>
/// <typeparam name="NODE">the type of the node payload</typeparam>
/// <typeparam name="EDGE">the type of the edge payload</typeparam>
/// <param name="g">the graph to plot</param>
/// <param name="format">a string format (as in string.Format method) representing the filename of the png to generate</param>
/// <param name="list">parameters of the string format (as in string.Format method)</param>
/// <returns>the png filename of the graph just computer</returns>
/// <see cref="string.Format(string, object[])"/>
public static string DrawGraph <NODE, EDGE>(IGraph <NODE, EDGE> g, string format, params object[] list)
{
string dotfilename = string.Format(format, list);
string pngfilename = string.Format(format, list);
if (!dotfilename.EndsWith(".dot"))
{
dotfilename += ".dot";
}
if (!pngfilename.EndsWith(".png"))
{
pngfilename += ".png";
}
using (StreamWriter sw = new StreamWriter(new FileStream(dotfilename, FileMode.Create, FileAccess.ReadWrite)))
{
sw.WriteLine("digraph {");
sw.WriteLine(string.Format(" label=\"{0}\";", g.Name));
//print nodes
foreach (Pair <long, NODE> pair in g.GetNodesEnumerable())
{
NODE n = g[pair.X];
sw.WriteLine(" N{0,5:D5} [label=\"{1}\\n{2}\"];", pair.X, pair.X, n.ToString());
}
//print edges
foreach (Triple <long, long, EDGE> e in g.GetEdgesEnumerable())
{
sw.WriteLine("N{0,5:D5} -> N{1,5:D5} [label=\"{2}\"];", e.X, e.Y, e.Z.ToString());
}
sw.WriteLine("}");
}
try
{
ProcessUtils.ExecuteCommandAndWait("dot.exe", "-Tpng -o {0} {1}", pngfilename, dotfilename);
}
catch (FileNotFoundException)
{
}
File.Delete(dotfilename);
return(pngfilename);
}