private Direction?GetRandomValidDirection(Map <T> map, T currentCell, T previousCell, IRandomizer randomizer)
{
var invalidDirections = new List <Direction>();
var squareDirections = new List <Direction>();
while (invalidDirections.Count + squareDirections.Count < GetAll.ValuesOf <Direction>().Count())
{
var direction = randomizer.GetRandomEnumValue(invalidDirections.Union(squareDirections));
if (IsDirectionValid(map, currentCell, direction, previousCell))
{
var nextCell = map.GetAdjacentCell(currentCell, direction);
//Try to avoid creating squares, but do it if there's no other way
if (nextCell.IsOpen &&
((nextCell.Sides[direction.Rotate()] &&
currentCell.Sides[direction.Rotate()]) ||
(nextCell.Sides[direction.Rotate(false)] &&
currentCell.Sides[direction.Rotate(false)])))
{
squareDirections.Add(direction);
}
else
{
return(direction);
}
}
else
{
invalidDirections.Add(direction);
}
}
return(squareDirections.Any() ? randomizer.GetRandomItem(squareDirections) : (Direction?)null);
}
private Direction?GetRandomValidDirection(Map <T> map, T cell, ICollection <T> visitedCells, double randomness, Direction?previousDirection, IRandomizer randomizer)
{
//Randomness determines how often the direction of a corridor changes
if (previousDirection.HasValue &&
randomness < 1 &&
randomizer.GetRandomDouble() > randomness &&
IsDirectionValid(map, cell, previousDirection.Value, visitedCells))
{
return(previousDirection);
}
var invalidDirections = new List <Direction>();
while (invalidDirections.Count < GetAll.ValuesOf <Direction>().Count())
{
var direction = randomizer.GetRandomEnumValue(invalidDirections);
if (IsDirectionValid(map, cell, direction, visitedCells))
{
return(direction);
}
invalidDirections.Add(direction);
}
return(null);
}