private bool CanConnectDiagonally(OuterGridCell nw, OuterGridCell ne, OuterGridCell sw, OuterGridCell se)
{
if (nw == null || ne == null || sw == null || se == null)
{
return(false);
}
return(nw.GetCorner(Dir.NW).Passable&&
ne.GetCorner(Dir.NE).Passable&&
sw.GetCorner(Dir.SW).Passable&&
se.GetCorner(Dir.SE).Passable);
}
public void CalculateGridConnectionsForCell(OuterGridCell current, int col, int row)
{
if (current == null)
{
return;
}
// Clear connections to prevent duplicates.
current.Connections = new List <Connection>();
// Orthogonal neighbours.
OuterGridCell north = this[col, row - 1];
OuterGridCell south = this[col, row + 1];
OuterGridCell east = this[col + 1, row];
OuterGridCell west = this[col - 1, row];
// Diagonal neighbours.
OuterGridCell northWest = this[col - 1, row - 1];
OuterGridCell northEast = this[col + 1, row - 1];
OuterGridCell southWest = this[col - 1, row + 1];
OuterGridCell southEast = this[col + 1, row + 1];
// North -> From[Top] To[Bot]
// South -> From[Bot] To[Top]
// East -> From[Right] To[Left]
// West -> From[Left] To[Right]
// Calculate orthogonal edge connections
if (north != null)
{
current.Connections.AddRange(CalculateEdgeConnections(this[col, row].GetEdge(Dir.N), north.GetEdge(Dir.S), current, north));
}
if (south != null)
{
current.Connections.AddRange(CalculateEdgeConnections(this[col, row].GetEdge(Dir.S), south.GetEdge(Dir.N), current, south));
}
if (east != null)
{
current.Connections.AddRange(CalculateEdgeConnections(this[col, row].GetEdge(Dir.E), east.GetEdge(Dir.W), current, east));
}
if (west != null)
{
current.Connections.AddRange(CalculateEdgeConnections(this[col, row].GetEdge(Dir.W), west.GetEdge(Dir.E), current, west));
}
// Calculate diagonal edge connections
if (CanConnectDiagonally(current, west, north, northWest)) // North West
{
current.Connections.Add(new Connection(current.GetCorner(Dir.NW), northWest.GetCorner(Dir.SE), current, northWest));
}
if (CanConnectDiagonally(east, current, northEast, north)) // North East
{
current.Connections.Add(new Connection(current.GetCorner(Dir.NE), northEast.GetCorner(Dir.SW), current, northEast));
}
if (CanConnectDiagonally(south, southWest, current, west)) // South West
{
current.Connections.Add(new Connection(current.GetCorner(Dir.SW), southWest.GetCorner(Dir.NE), current, southWest));
}
if (CanConnectDiagonally(southEast, south, east, current)) // South East
{
current.Connections.Add(new Connection(current.GetCorner(Dir.SE), southEast.GetCorner(Dir.NW), current, southEast));
}
// Calculate internal edge connections
current.CalculateInternalConnections();
}