public static Action Minimax(PentagoBoard currentState, Status.StateEnum color, int depth, NodeSelecter sel, StateEvaluater eva)
{
Action bestAction = null;
Placement curPlc = new Placement()
{
Player = color,
};
Rotation curRtt = new Rotation();
for (int i = 0; i < currentState.TotalWidth; i++)
{
for (int j = 0; j < currentState.TotalHeight; j++)
{
if (currentState[i, j].State == Status.StateEnum.empty)
{
//curPlc = new Placement();
curPlc.X = i;
curPlc.Y = j;
curPlc.Do(currentState);
for (int k = 0; k < currentState.Sections.Count; k++)
{
//curRtt = new Rotation();
curRtt.SectionNo = k;
curRtt.Clockwise = true;
curRtt.Do(currentState);
if (depth <= 1 || currentState.IsFull(Status.StateEnum.empty) ||
currentState.HasConsecutiveNPiece(color, 5) ||
currentState.HasConsecutiveNPiece(GetOppoColor(color), 5))
{
int value = eva(currentState, color);
if (bestAction == null)
{
bestAction = new Action(curPlc, curRtt);
bestAction.Value = value;
}
else if (sel(bestAction.Value, value) > 0)
{
bestAction.SetAction(curPlc, curRtt);
bestAction.Value = value;
}
}
else
{
var subAction = Minimax(currentState, GetOppoColor(color), depth - 1, sel, eva);
if (bestAction == null)
{
bestAction = new Action(curPlc, curRtt);
bestAction.Value = -subAction.Value;
}
else if (sel(bestAction.Value, -subAction.Value) > 0)
{
bestAction.SetAction(curPlc, curRtt);
bestAction.Value = -subAction.Value;
}
}
curRtt.RollBack(currentState);
//if the board state remains the same after rotating clockwise, it will be the same after rotating counterclockwise
//so the node can be eliminated
if (!currentState.Sections[k].IsSameInBothDirection)
{
curRtt.Clockwise = false;
curRtt.Do(currentState);
if (depth == 1 || currentState.IsFull(Status.StateEnum.empty) ||
currentState.HasConsecutiveNPiece(color, 5) ||
currentState.HasConsecutiveNPiece(GetOppoColor(color), 5))
{
int value = eva(currentState, color);
if (bestAction == null)
{
bestAction = new Action(curPlc, curRtt);
bestAction.Value = value;
}
else if (sel(bestAction.Value, value) > 0)
{
bestAction.SetAction(curPlc, curRtt);
bestAction.Value = value;
}
}
else
{
var subAction = Minimax(currentState, GetOppoColor(color), depth - 1, sel, eva);
if (sel(bestAction.Value, -subAction.Value) > 0)
{
bestAction.SetAction(curPlc, curRtt);
bestAction.Value = -subAction.Value;
}
}
curRtt.RollBack(currentState);
}
}
curPlc.RollBack(currentState);
}
}
}
return(bestAction);
}
public static Action MinimaxLocal(PentagoBoard currentState, Status.StateEnum color, int depth, NodeSelecter sel, StateEvaluater eva)
{
Action bestAction = null;
Placement curPlc = new Placement()
{
Player = color,
};
Rotation curRtt = new Rotation();
var searchSpace = new bool[6, 6];
if (currentState.IsEmpty(Status.StateEnum.empty))
{
for (int i = 0; i < currentState.TotalWidth; i++)
{
for (int j = 0; j < currentState.TotalHeight; j++)
{
searchSpace[i, j] = true;
}
}
}
else if (currentState.CountSteps(Status.StateEnum.empty) < 5)
{
for (int i = 0; i < currentState.TotalWidth; i++)
{
for (int j = 0; j < currentState.TotalHeight; j++)
{
if (currentState[i, j].State == GetOppoColor(color))
{
for (int k = (i == 0) ? 0 : -1; k <= ((i == currentState.TotalWidth - 1) ? 0 : 1); k++)
{
for (int l = (j == 0) ? 0 : -1; l <= ((j == currentState.TotalHeight - 1) ? 0 : 1); l++)
{
if (!(k == 0 && l == 0) && !searchSpace[i + k, j + l] && currentState[i + k, j + l].State == Status.StateEnum.empty)
{
searchSpace[i + k, j + l] = true;
}
}
}
}
}
}
}
else
{
for (int i = 0; i < currentState.TotalWidth; i++)
{
for (int j = 0; j < currentState.TotalHeight; j++)
{
if (currentState[i, j].State != Status.StateEnum.empty)
{
for (int k = (i == 0) ? 0 : -1; k <= ((i == currentState.TotalWidth - 1) ? 0 : 1); k++)
{
for (int l = (j == 0) ? 0 : -1; l <= ((j == currentState.TotalHeight - 1) ? 0 : 1); l++)
{
if (!(k == 0 && l == 0) && !searchSpace[i + k, j + l] && currentState[i + k, j + l].State == Status.StateEnum.empty)
{
searchSpace[i + k, j + l] = true;
}
}
}
}
}
}
}
var nospace = searchSpace.Cast <bool>().All(e => !e);
for (int i = 0; i < currentState.TotalWidth; i++)
{
for (int j = 0; j < currentState.TotalHeight; j++)
{
if (searchSpace[i, j])
{
//curPlc = new Placement();
curPlc.X = i;
curPlc.Y = j;
curPlc.Do(currentState);
for (int k = 0; k < currentState.Sections.Count; k++)
{
//curRtt = new Rotation();
curRtt.SectionNo = k;
curRtt.Clockwise = true;
curRtt.Do(currentState);
if (depth <= 1 || currentState.IsFull(Status.StateEnum.empty) ||
currentState.HasConsecutiveNPiece(color, 5) ||
currentState.HasConsecutiveNPiece(GetOppoColor(color), 5))
{
int value = eva(currentState, color);
if (bestAction == null)
{
bestAction = new Action(curPlc, curRtt);
bestAction.Value = value;
}
else if (sel(bestAction.Value, value) > 0)
{
bestAction.SetAction(curPlc, curRtt);
bestAction.Value = value;
}
}
else
{
var subAction = Minimax(currentState, GetOppoColor(color), depth - 1, sel, eva);
if (bestAction == null)
{
bestAction = new Action(curPlc, curRtt);
bestAction.Value = -subAction.Value;
}
else if (sel(bestAction.Value, -subAction.Value) > 0)
{
bestAction.SetAction(curPlc, curRtt);
bestAction.Value = -subAction.Value;
}
}
curRtt.RollBack(currentState);
//if the board state remains the same after rotating clockwise, it will be the same after rotating counterclockwise
//so the node can be eliminated
if (!currentState.Sections[k].IsSameInBothDirection)
{
curRtt.Clockwise = false;
curRtt.Do(currentState);
if (depth == 1 || currentState.IsFull(Status.StateEnum.empty) ||
currentState.HasConsecutiveNPiece(color, 5) ||
currentState.HasConsecutiveNPiece(GetOppoColor(color), 5))
{
int value = eva(currentState, color);
if (bestAction == null)
{
bestAction = new Action(curPlc, curRtt);
bestAction.Value = value;
}
else if (sel(bestAction.Value, value) > 0)
{
bestAction.SetAction(curPlc, curRtt);
bestAction.Value = value;
}
}
else
{
var subAction = Minimax(currentState, GetOppoColor(color), depth - 1, sel, eva);
if (sel(bestAction.Value, -subAction.Value) > 0)
{
bestAction.SetAction(curPlc, curRtt);
bestAction.Value = -subAction.Value;
}
}
curRtt.RollBack(currentState);
}
}
curPlc.RollBack(currentState);
}
}
}
return(bestAction);
}
