public IOrderedEnumerable <Move> GetMoves(BoardManager manager)
{
var moves = new List <Move>();
if (manager.ActiveBlock == null)
{
return(moves.OrderByDescending(x => x.IsValid));
}
// enumerate all possible block x positions with rotations, calculate their fitness
var rowClearings = manager.GameStats.TotalRowClearings;
for (var rotation = 0; rotation < manager.ActiveBlock.BlockRotations; rotation++)
{
for (var column = -2; column < manager.NumberOfColumns; column++)
{
var tempManager = new BoardManager(manager.GameBoard.DeepClone(), manager.ActiveBlock.Clone(), manager.GameStats.Clone(), null);
var tempBlock = tempManager.ActiveBlock.Clone();
// set rotation
for (var i = 0; i < rotation; i++)
{
tempBlock.Move(Tetris.Engine.Move.RotateRight);
}
// set x position
var columnOffset = column - manager.ActiveBlock.Position.Column;
// create move if appropriate position
if (moveBlock())
{
while (tempManager.CheckBlock(tempBlock.Move(Tetris.Engine.Move.Down)))
{
}
// restore previous block position
tempManager.ActiveBlock.Merge(tempBlock.Move(Tetris.Engine.Move.Up));
tempManager.LockBlock();
tempManager.CheckBoard();
var rowsCleared = tempManager.GameStats.TotalRowClearings - rowClearings;
moves.Add(new Move
{
ColumnOffSet = columnOffset,
Fitness = tempManager.CanSpawnBlock()
? algorithm.CalculateFitness(tempManager.GameBoard, tempBlock.Position.Row, rowsCleared)
: int.MaxValue,
IsValid = true,
Rotation = rotation
});
}
/////////////////////////////////////
bool moveBlock()
{
var step = columnOffset > 0 ? 1 : -1;
var move = columnOffset > 0 ? Tetris.Engine.Move.Right : Tetris.Engine.Move.Left;
for (var n = 0; n != columnOffset; n += step)
{
if (tempManager.CheckBlock(tempBlock.Move(move)) == false)
{
return(false);
}
}
return(true);
}
}
}
return(moves.OrderByDescending(x => x.IsValid).ThenBy(x => x.Fitness));
}