/// <summary>
/// Connects
/// </summary>
/// <param name="node"></param>
/// <param name="direction"></param>
/// <returns></returns>
public IGraphVertex <T> ConnectNode(IGraphNode <T> node, IoDirection direction)
{
var vertex = this.Vertices.FirstOrDefault((x) => x.HasRelation(this, node));
if (vertex == null)
{
vertex = new GraphVertex <T>(this, node, direction);
this.RegisterVertex(vertex);
node.RegisterVertex(vertex);
}
return(vertex);
}