chessGameGraph.dot

digraph {
  compound=true;
  node [ fontname="Handlee" ];
  subgraph cluster_main {
    label="Main";
    file[label="PGN File" shape=tab];
    subgraph cluster_pgn_parser {
        label="PGN Parser";
        style=filled
        fillcolor=thistle1
        pgn_to_moves[label="PGN To Moves" shape=rect style=filled fillcolor=magenta1];
        pre_process_moves[label="Pre Process Moves" shape=rect style=filled fillcolor=orchid];
        pre_process_move[label="Pre Process Move\nSplit into white\nand black move.\nStrip \'+\',\'x\' etc" shape=rect style=filled fillcolor=plum1];
    }
    traverse_moves[label="Traverse Moves" shape=rect]
    is_piece_pawn_castle[label="Is Pawn?\nIs Other Piece?\nIs Castle?" shape=diamond];
    subgraph cluster_pawn {
        label="Pawn";
        style=filled 
        fillcolor=lightcyan
        make_pawn_move[label="Determine type\nof pawn move" shape=rect style=filled fillcolor=deepskyblue2];
        is_capture[label="Is capture" shape=rect style=filled fillcolor=cyan];
        en_passant[label="En passant capture\nUpdate board\nand piece view" shape=rect style=filled fillcolor=paleturquoise2];
        capture_pawn[label="Normal capture\nUpdate board\nand piece view" shape=rect style=filled fillcolor=paleturquoise2];
        move_pawn[label="Normal move\nUpdate board\nand piece view" shape=rect style=filled fillcolor=cyan];
        promotion_pawn[label="Pawn Promotion\nUpdate board\nand piece view" shape=rect style=filled fillcolor=cyan];
    }
    setup[label="Setup board view\nand piece view" shape=rect];
    subgraph cluster_piece {
        label="Piece";
        style=filled;
        fillcolor=darkseagreen1;
        castle[label="Determine castling\nwhich side\nUpdate board\nand piece view" shape=rect style=filled fillcolor=springgreen2];
        move_piece[label="Extract piece\nand square to" shape=rect style=filled fillcolor=springgreen2];
        is_capture_piece[label="Is capture?" shape=diamond style=filled fillcolor=indianred1];
        extract_captured_piece[label="Extract\ncaptured piece" shape=rect style=filled fillcolor=springgreen2];
        get_from_square[label="Get from square\nby checking valid\nmoves and if\npiece can move\nto \'square to\'" shape=rect style=filled fillcolor=springgreen2];
        update_board_piece_view[label="Update board\nand piece view" shape=rect style=filled fillcolor=springgreen2];
    }
}

  file->pgn_to_moves
  pgn_to_moves->pre_process_moves[constraint=false]
  pre_process_moves->pre_process_move[constraint=false]
  pre_process_move->pre_process_moves[constraint=false]
  pre_process_moves ->traverse_moves
  traverse_moves->is_piece_pawn_castle
  is_piece_pawn_castle:w-> make_pawn_move:w
  make_pawn_move:sw -> move_pawn;
  make_pawn_move:s -> is_capture;
  make_pawn_move:se -> promotion_pawn 
  is_capture->capture_pawn;
  is_capture->en_passant;
  is_piece_pawn_castle:e->move_piece
  is_piece_pawn_castle:ne->castle[constraint=false]
  move_piece->is_capture_piece
  is_capture_piece->extract_captured_piece[color=green]
  extract_captured_piece->get_from_square
  is_capture_piece->get_from_square[color=red]
  get_from_square->update_board_piece_view
}