public void AddChild(Stop stop, Tree tree)
{
Node node = new Node();
node.Parent = this;
node.value = stop;
Child.Add(node);
tree.nodeList.Add(node);
}
private static void bfsGraph(List<Route> routes, List<Stop> stops)
{
Stop initial = stops.FirstOrDefault(o => o.name == "BAKIRKÖY");
Stop goal = stops.FirstOrDefault(o => o.name == "KABATAŞ");
// prepare the resulting tree which will be used to create solutioin sequence
Tree solutionTree = new Tree();
// find routes passing through a stop
List<Route> passRoutes = new List<Route>();
Queue<Stop> frontier = new Queue<Stop>(); frontier.Enqueue(initial);
List<Stop> explored = new List<Stop>();
while (true)
{
if (frontier.Count == 0)
{
Console.WriteLine("No Solution");
break;
}
Stop currentStop = frontier.Dequeue();
passRoutes.Clear();
routes.Where(o => o.stops.Contains(currentStop)).ToList().ForEach(o => passRoutes.Add(o));
explored.Add(currentStop);
Node node = new Node();
if (currentStop.name == goal.name)
{
Console.WriteLine("Destination Reached.");
node = solutionTree.nodeList.FirstOrDefault(o => o.value.name == currentStop.name);
if (node == null)
Console.WriteLine("Current Node not found in the solution tree node list: " + currentStop.name);
List<Stop> solution = new List<Stop>();
while (node.isRoot == false)
{
solution.Add(node.value);
node = node.Parent;
}
solution.Add(node.value);
solution.Reverse();
Console.WriteLine("\nSolution is: \n");
Console.ReadKey(); /*
foreach (Stop s in solution)
{
Console.Write(s.name + " ");
Console.WriteLine();
}
*/
Stop stop1; Stop stop2;
for (int i = 0; i < solution.Count-1; i++)
{
stop1 = solution[i];
stop2 = solution[i + 1];
Route r = findRoute(stop1, stop2, routes);
Console.WriteLine(stop1.name + " - " + stop2.name + " => " + r.name);
}
break;
}
// if tree is initially empty, add the root node
if (solutionTree.nodeList.Count == 0)
{
node.value = currentStop;
node.isRoot = true;
solutionTree.root = node;
solutionTree.nodeList.Add(node);
} else
{
node = solutionTree.nodeList.FirstOrDefault(o => o.value.name == currentStop.name);
if (node == null)
Console.WriteLine("Current Node not found in the solution tree node list: " + currentStop.name);
}
//Console.WriteLine("Routes passing through: " + currentStop.name);
// find adjacent stops of the current stop
foreach (Route r in passRoutes) // for each route containing current stop
{
//Console.Write(r.name + " :\t");
// find the index of the current stop in the routes containing the stop
int index = r.stops.IndexOf(currentStop);
if (index >= 1) // if its not the first element
{
// add frontier and tree the previous stop
if (frontier.Contains(r.stops[index - 1]) == false &&
explored.Contains(r.stops[index - 1]) == false)
{
frontier.Enqueue(r.stops[index - 1]);
node.AddChild(r.stops[index - 1], solutionTree);
//Console.Write(r.stops[index - 1].name + ", ");
}
}
if (index < r.stops.Count - 1) // and not the last element
{
if (frontier.Contains(r.stops[index + 1]) == false &&
explored.Contains(r.stops[index + 1]) == false)
{
// add frontier the next stop in the list
frontier.Enqueue(r.stops[index + 1]);
node.AddChild(r.stops[index + 1], solutionTree);
//Console.Write(r.stops[index + 1].name + " ");
}
}
//Console.WriteLine();
}
//Console.ReadKey();
}
}
