public Route GetShortestRoute(RicePaddy start, RicePaddy end)
{
if (!m_shortestRoutesMap.ContainsKey(start))
{
m_shortestRoutesMap[start] = CalculateShortestRoutes(start);
}
return(m_shortestRoutesMap[start][end]);
}
// We will get the shortest path between the begin RicePaddy and the end RicePaddy by Dijkstra's algorithm.
Dictionary <RicePaddy, Route> CalculateShortestRoutes(RicePaddy start)
{
var shortestRoutes = new Dictionary <RicePaddy, Route>();
var handled = new List <RicePaddy>();
foreach (var ricePaddy in m_ricePaddies)
{
shortestRoutes.Add(ricePaddy, new Route(ricePaddy.Identifier));
}
shortestRoutes[start].TotalDistance = 0;
while (handled.Count != m_ricePaddies.Count)
{
var shortestRicePaddies = shortestRoutes.OrderBy(_ => _.Value.TotalDistance).Select(_ => _.Key).ToArray();
var processing = default(RicePaddy);
foreach (var ricePaddy in shortestRicePaddies)
{
if (!handled.Contains(ricePaddy))
{
if (shortestRoutes[ricePaddy].TotalDistance == int.MaxValue)
{
return(shortestRoutes);
}
processing = ricePaddy;
break;
}
}
var selectedRoads = m_roads.Where(_ => _.A == processing);
foreach (var road in selectedRoads)
{
if (shortestRoutes[road.B].TotalDistance > road.Distance + shortestRoutes[road.A].TotalDistance)
{
var roads = shortestRoutes[road.A].Roads.ToList();
roads.Add(road);
shortestRoutes[road.B].Roads = roads;
shortestRoutes[road.B].TotalDistance = road.Distance + shortestRoutes[road.A].TotalDistance;
}
}
handled.Add(processing);
}
return(shortestRoutes);
}
// We will get the shortest path between the begin RicePaddy and the end RicePaddy by Dijkstra's algorithm.
Dictionary<RicePaddy, Route> CalculateShortestRoutes(RicePaddy start)
{
var shortestRoutes = new Dictionary<RicePaddy, Route>();
var handled = new List<RicePaddy>();
foreach (var ricePaddy in m_ricePaddies)
{
shortestRoutes.Add(ricePaddy, new Route(ricePaddy.Identifier));
}
shortestRoutes[start].TotalDistance = 0;
while (handled.Count != m_ricePaddies.Count)
{
var shortestRicePaddies = shortestRoutes.OrderBy(_ => _.Value.TotalDistance).Select(_ => _.Key).ToArray();
var processing = default(RicePaddy);
foreach (var ricePaddy in shortestRicePaddies)
{
if (!handled.Contains(ricePaddy))
{
if (shortestRoutes[ricePaddy].TotalDistance == int.MaxValue)
return shortestRoutes;
processing = ricePaddy;
break;
}
}
var selectedRoads = m_roads.Where(_ => _.A == processing);
foreach (var road in selectedRoads)
{
if (shortestRoutes[road.B].TotalDistance > road.Distance + shortestRoutes[road.A].TotalDistance)
{
var roads = shortestRoutes[road.A].Roads.ToList();
roads.Add(road);
shortestRoutes[road.B].Roads = roads;
shortestRoutes[road.B].TotalDistance = road.Distance + shortestRoutes[road.A].TotalDistance;
}
}
handled.Add(processing);
}
return shortestRoutes;
}
public Route GetShortestRoute(RicePaddy start, RicePaddy end)
{
if (!m_shortestRoutesMap.ContainsKey(start))
m_shortestRoutesMap[start] = CalculateShortestRoutes(start);
return m_shortestRoutesMap[start][end];
}