/// <summary>
/// Retrieves the specified neighbour of this node.
/// </summary>
/// <param name="node"></param>
/// <param name="neighbour"></param>
/// <returns>The neighbour or null, if no neighbour is found.</returns>
public IHexagonNetNode <T> GetNeighbourFor(IHexagonNetNode <T> node, HexagonNetEnums.Neighbours neighbour)
{
if (node == null)
{
throw new ArgumentException("Cannot find the neigbour for the node that is null!");
}
if (node.Position == null)
{
throw new ArgumentException("The node has to be positioned within the HexagonNet!");
}
IHexagonNetNode <T> neighbourNode = null;
try
{
var row = net[node.Position.x];
if (row.Shifted)
{
neighbourNode = GetNeighbourForShiftedRowNode(node, neighbour);
}
else
{
neighbourNode = GetNeighbourForNotShiftedRowNode(node, neighbour);
}
}
catch (Exception ex)
{
Type exType = ex.GetType();
if (exType == typeof(IndexOutOfRangeException) || exType == typeof(KeyNotFoundException))
{
// Means we are at the border or the row above/below is not yet added
// Simply leave the neighbourNode == null;
}
else
{
throw;
}
}
return(neighbourNode);
}
private IHexagonNetNode <T> GetNeighbourForNotShiftedRowNode(IHexagonNetNode <T> node, HexagonNetEnums.Neighbours neighbour)
{
IHexagonNetNode <T> neighbourNode = null;
var nodePosition = node.Position;
switch (neighbour)
{
case HexagonNetEnums.Neighbours.UpperLeft:
neighbourNode = net[nodePosition.x - 1].Nodes[nodePosition.y - 1];
break;
case HexagonNetEnums.Neighbours.UpperRight:
neighbourNode = net[nodePosition.x - 1].Nodes[nodePosition.y];
break;
case HexagonNetEnums.Neighbours.Left:
neighbourNode = net[nodePosition.x].Nodes[nodePosition.y - 1];
break;
case HexagonNetEnums.Neighbours.Right:
neighbourNode = net[nodePosition.x].Nodes[nodePosition.y + 1];
break;
case HexagonNetEnums.Neighbours.LowerLeft:
neighbourNode = net[nodePosition.x + 1].Nodes[nodePosition.y - 1];
break;
case HexagonNetEnums.Neighbours.LowerRight:
neighbourNode = net[nodePosition.x + 1].Nodes[nodePosition.y];
break;
}
return(neighbourNode);
}
