private GridMutation RenderNextTetro(Tetro tetro) { var m = new TextWriter().WriteText(_x, _y + 2, "next:"); foreach (Block b in tetro.Blocks) { m.AddTarget(new DrawablePoint(b.X + _x + 2, b.Y + 4, b.ForeColor, b.Symbol, b.Debug)); } return(m); }