public static void bn_map_forEachTrue(Action <BlockGroup, int, int> fn, BlockGroup blkG, List <string> bin = null)
{
if (bin == null)
{
bin = TetrominoControls.mapTetromino(blkG.GetPiece());
}
bool read_row(int curr)
{
if (curr < bin.Count)
{
return(read_col(bin[curr], curr, 0));
}
return(true);
}
bool read_col(string s, int r, int curr) //read all columns of a row
{
if (curr < s.Length)
{
if (s[curr] == '1')
{
fn(blkG, curr, r);
}
return(read_col(s, r, curr + 1));
}
return(read_row(r + 1));
}
read_row(0);
}