/// <summary>
/// Extracts the next piece visible on the screenshot.
/// Throws an exception, if the next piece is not visible on the screenshot.
/// </summary>
/// <param name="screenshot">The screenshot to extract the piece from.</param>
/// <returns>The next Tetrimino.</returns>
public Tetrimino ExtractNextPiece(IScreenshot screenshot)
{
// relevant tiles on the screen: x : 14 - 17, y : 13 - 16
ushort mask = 0;
for (int x = 0; x < 4; x++)
{
for (int y = 0; y < 4; y++)
{
byte mean = screenshot.GetTileMean(TetrisConstants.NextPieceTileOrigin.X + x, TetrisConstants.NextPieceTileOrigin.Y + y);
if (IsBlock(mean))
{
int index = 4 * (2 - y) + (x);
mask |= (ushort)(1 << index);
}
}
}
var nextPiece = Piece.FromMask(mask);
if (nextPiece?.Tetrimino == null)
{
throw new ApplicationException("Next piece not visible on the screenshot");
}
return(nextPiece.Tetrimino);
}
// x and y are in board coordinates
private byte GetTileBlockMean(IScreenshot screenshot, int x, int y)
{
// TODO: make relative to board size?
// ignore walls
if (x < 2 || x > 11)
{
return(255);
}
if (y < 0 || y > 17)
{
return(255);
}
return(screenshot.GetTileMean(x, y));
}
// Tiles: x : 14 - 17, y : 13 - 16
public Tetrimino?ExtractNextPiece(IScreenshot screenshot)
{
ushort mask = 0;
for (int x = 0; x < 4; x++)
{
for (int y = 0; y < 4; y++)
{
byte mean = screenshot.GetTileMean(TetrisConstants.NextPieceTileOrigin.X + x, TetrisConstants.NextPieceTileOrigin.Y + y);
if (IsBlock(mean))
{
int index = 4 * (2 - y) + (x);
mask |= (ushort)(1 << index);
}
}
}
return(Piece.FromMask(mask)?.Tetrimino);
}
// Tiles: x : 5 - 8, y : 0 - 2
public Board ExtractBoard(IScreenshot screenshot)
{
var board = new Board();
for (int x = 0; x < 10; x++)
{
// TODO: extract whole board but subtract current piece
for (int y = 3; y < 18; y++)
{
byte mean = screenshot.GetTileMean(TetrisConstants.BoardTileOrigin.X + x, TetrisConstants.BoardTileOrigin.Y + y);
if (IsBlock(mean))
{
board.Occupy(x, 17 - y);
}
}
}
return(board);
}
// x and y are in board coordinates
private bool IsTileBlock(IScreenshot screenshot, int x, int y)
{
// TODO: make relative to board size?
// ignore walls
if (x < 2 || x > 11)
{
return(false);
}
if (y < 0 || y > 17)
{
return(false);
}
var mean = screenshot.GetTileMean(x, y);
if (IsBlock(mean))
{
return(true);
}
return(false);
}
