/// <summary>
/// Evaluates all possible neighbor cells. The return values of <paramref name="f"/> are used as probability multipliers
/// to chose a random a option.
/// Currently not thread-safe
/// </summary>
/// <param name="location">Location to evaluate the neighborhood of</param>
/// <param name="f">Evaluation function. Must return 0/NotAChoice if not applicable, and >1 otherwise. Higher values indicate higher probability</param>
/// <returns>Chocen relative cell, or Grid.RelativeCell.Invalid if none was found.</returns>
public static Grid.RelativeCell EvaluateChoices(Grid.CellID location, Func<Grid.RelativeCell, Grid.CellID, int> f)
{
options.Clear();
int total = 0;
foreach (var n in location.GetRelativeNeighbors())
{
Grid.CellID cellLocation = location + n;
int q = f(n, cellLocation);
if (q > 0)
{
total += q;
options.Add(new KeyValuePair<int, Grid.RelativeCell>(q, n));
}
}
if (total == 0)
return Grid.RelativeCell.Invalid;
if (options.Count == 1)
return options[0].Value;
int c = random.Next(total);
foreach (var o in options)
{
if (c <= o.Key)
return o.Value;
c -= o.Key;
}
Out.Log(Significance.ProgramFatal, "Logic error");
return Grid.RelativeCell.Invalid;
}
public static Grid.RelativeCell EvaluateYieldChoices(Grid.CellID location, Func<Grid.RelativeCell, Grid.CellID, int> f)
{
options.Clear();
foreach (var n in location.GetRelativeNeighbors())
{
Grid.CellID cellLocation = location + n;
int q = f(n, cellLocation);
if (q > 0)
{
options.Add(new KeyValuePair<int, Grid.RelativeCell>(q, n));
}
}
if (options.Count == 0)
{
//Out.Log(Significance.ProgramFatal, "Logic error");
return Grid.RelativeCell.Invalid;
}
if (options.Count == 1)
return options[0].Value;
int maxYield = 0;
Grid.RelativeCell maxOption = Grid.RelativeCell.Invalid;
foreach (var o in options)
{
if(maxYield <= o.Key)
{
maxYield = o.Key;
maxOption = o.Value;
}
}
return maxOption;
//else
//{
// Out.Log(Significance.ProgramFatal, "Logic error");
// return Grid.RelativeCell.Invalid;
//}
}
