// Graphs
public async Task <List <JsonGraphRootObject> > GetLocalStorageGraphs()
{
var localStorageGraphs = new List <JsonGraphRootObject>();
for (var i = 0; i < await _localStorage.LengthAsync(); i++)
{
var key = await _localStorage.KeyAsync(i);
JsonGraphRootObject jsonObject = null;
try
{
jsonObject = await _localStorage.GetItemAsync <JsonGraphRootObject>(key);
if (!(jsonObject.Vertices?.Count > 0))
{
continue;
}
}
catch (Exception)
{
Console.WriteLine($"Could not convert local storage object with key '{ key }' to graph object, ignoring object.");
}
if (jsonObject != null)
{
localStorageGraphs.Add(jsonObject);
}
}
return(localStorageGraphs);
}
public static Graph <VertexInfo, EdgeInfo> GenerateGraph(JsonGraphRootObject json)
{
var graph = new Graph <VertexInfo, EdgeInfo>();
// Add vertices
foreach (var vertex in json.Vertices)
{
graph.AddVertex(new VertexInfo()
{
Name = vertex.Name,
Type = DetermineVertexType(vertex.Type),
Position = new Tuple <double, double>(vertex.Latitude, vertex.Longitude)
});
}
// Add edges
foreach (var vertex in json.Vertices)
{
foreach (var edge in vertex.Edges)
{
var origin = graph.CustomFirstOrDefault(v => v.Name == vertex.Name);
var destination = graph.CustomFirstOrDefault(v => v.Name == edge.Target);
if (origin != null && destination != null)
{
graph.AddEdge(origin, destination, new EdgeInfo()
{
Distance = GeographicalHelpers.CalculateGeographicalDistanceInMeters(origin.Info.Position, destination.Info.Position),
GMapsDistanceAndTime = edge.Modes.ToDictionary(mode => Enum.Parse <TravelMode>(mode.TravelMode), mode => Tuple.Create((double)mode.Distance, (double)mode.Time))
});
}
}
}
return(graph);
}