private void SyncGraphState(FormationDistance edge, FormationDistance edgeReciprocal, GameFormation nodeA, GameFormation nodeB)
{
// If neither the source -> target nor target -> source distances are in the Distances graph, create them at default starting range
if (edge is null && edgeReciprocal is null)
{
edge = this.AddEdge(nodeA, nodeB, Constants.DefaultStartingRange);
edgeReciprocal = this.AddEdge(nodeB, nodeA, Constants.DefaultStartingRange);
}
private FormationDistance AddEdge(GameFormation nodeA, GameFormation nodeB, int edgeWeight)
{
var newEdge = new FormationDistance(nodeA, nodeB, edgeWeight);
this.edges.Add(newEdge);
return(newEdge);
}
public FormationDistance GetOrEstablishDistance(int sourceId, int targetId, int establishDistance)
{
// Ensure valid inputs
GameFormation nodeA = this.GetNodeById(sourceId);
GameFormation nodeB = this.GetNodeById(targetId);
if (establishDistance < 0)
{
throw new InvalidOperationException($"Invalid starting distance {establishDistance}: Formation distances must always be nonnegative.");
}
FormationDistance edge = this.GetEdge(nodeA, nodeB);
FormationDistance edgeReciprocal = this.GetEdge(nodeB, nodeA);
// edge-weight is equal to the edge-weight of the existing edge(s) or else the specified "establishDistance"
var edgeWeight = edge != null ? edge.Value : edgeReciprocal != null ? edgeReciprocal.Value : establishDistance;
// ensure both edge and its reciprocal exist
edge = edge ?? this.AddEdge(nodeA, nodeB, edgeWeight);
edgeReciprocal = edgeReciprocal ?? this.AddEdge(nodeB, nodeA, edgeWeight);
return(edge);
}