public void TestGetNeighborEdges()
{
var hex = new HexEdge(0, 0, 1, 0);
var neighbors = hex.GetNeighborEdges();
Assert.AreEqual(4, neighbors.Count, "A hex edge must have 4 neighbors.");
var msg = "Hex edge is missing a neighbor.";
Assert.IsTrue(neighbors.Contains(new HexEdge(0, 0, 0, -1)), msg);
Assert.IsTrue(neighbors.Contains(new HexEdge(1, 0, 0, -1)), msg);
Assert.IsTrue(neighbors.Contains(new HexEdge(0, 0, 1, 1)), msg);
Assert.IsTrue(neighbors.Contains(new HexEdge(1, 0, 1, 1)), msg);
}
private IEnumerable<HexEdge> GetRoadPermutations(int player, HexEdge road, IEnumerable<HexEdge> allPlayerRoads)
{
return road.GetNeighborEdges()
.Where(e => allPlayerRoads.Contains(e) &&
!IsEnemyPlayerBuildingHere(player, road.GetNeighborPoint(e))); // An enemy building can cut off a road.
}
/// <summary>
/// Returns a success result if this is a valid placement for a road.
/// </summary>
public ActionResult ValidateRoadPlacement(int player, HexEdge edge, bool startOfGame)
{
if (!IsEdgeInBoard(edge))
{
return new ActionResult(false, string.Format("The road location {0} is out of bounds.", edge));
}
// Do not allow removing a road.
if (_roads.ContainsKey(edge))
{
return new ActionResult(false, string.Format("The road location {0} is already used.", edge));
}
if (startOfGame)
{
// Make sure this is touching a settlement owned by this player. It's the start of the game.
if (!IsPlayerBuildingHere(player, edge))
{
return new ActionResult(false, String.Format("The road location {0} is not near a settlement.", edge));
}
}
else
{
// We must be near a settlement, city, or another road.
if (!IsPlayerBuildingHere(player, edge))
{
bool isTouchingRoad = false;
foreach (var surroundingRoad in edge.GetNeighborEdges())
{
if (IsPlayerRoadHere(player, surroundingRoad))
{
isTouchingRoad = true;
break;
}
}
if (!isTouchingRoad)
{
return new ActionResult(false, string.Format("The road location {0} is not near a city, settlement, or road.", edge));
}
}
}
return ActionResult.CreateSuccess();
}