git.sesse.net Git - remoteglot/blob - www/js/book.js

   1 (function() {
   2
   3 var board = null;
   4 var moves = [];
   5 var move_override = 0;
   6
   7 var get_game = function() {
   8         var game = new Chess();
   9         for (var i = 0; i < move_override; ++i) {
  10                 game.move(moves[i]);
  11         }
  12         return game;
  13 }
  14
  15 var update = function() {
  16         var game = get_game();
  17         board.position(game.fen());
  18         fetch_analysis();
  19 }
  20
  21 var fetch_analysis = function() {
  22         var game = get_game();
  23         $.ajax({
  24                 url: "/opening-stats.pl?fen=" + encodeURIComponent(game.fen())
  25         }).done(function(data, textstatus, xhr) {
  26                 show_lines(data, game);
  27         });
  28 }
  29
  30 var add_td = function(tr, value) {
  31         var td = document.createElement("td");
  32         tr.appendChild(td);
  33         $(td).addClass("num");
  34         $(td).text(value);
  35 }
  36
  37 var show_lines = function(data, game) {
  38         var moves = data['moves'];
  39         $('#numviewers').text(data['opening']);
  40         var total_num = 0;
  41         for (var i = 0; i < moves.length; ++i) {
  42                 var move = moves[i];
  43                 total_num += parseInt(move['white']);
  44                 total_num += parseInt(move['draw']);
  45                 total_num += parseInt(move['black']);
  46         }
  47
  48         var tbl = $("#lines");
  49         tbl.empty();
  50
  51         for (var i = 0; i < moves.length; ++i) {
  52                 var move = moves[i];
  53                 var tr = document.createElement("tr");
  54
  55                 var white = parseInt(move['white']);
  56                 var draw = parseInt(move['draw']);
  57                 var black = parseInt(move['black']);
  58
  59                 // Move.
  60                 var move_td = document.createElement("td");
  61                 tr.appendChild(move_td);
  62                 $(move_td).addClass("move");
  63
  64                 var move_a = document.createElement("a");
  65                 move_a.href = "javascript:make_move('" + move['move'] + "')";
  66                 move_td.appendChild(move_a);
  67                 $(move_a).text(move['move']);
  68
  69                 // #.
  70                 var num = white + draw + black;
  71                 add_td(tr, num);
  72
  73                 // %.
  74                 add_td(tr, (100.0 * num / total_num).toFixed(1) + "%");
  75
  76                 // Win%.
  77                 var white_win_ratio = (white + 0.5 * draw) / num;
  78                 var win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
  79                 add_td(tr, ((100.0 * win_ratio).toFixed(1) + "%"));
  80
  81                 // Elo.
  82                 add_td(tr, move['white_avg_elo'].toFixed(1));
  83                 add_td(tr, move['black_avg_elo'].toFixed(1));
  84
  85                 // Win% corrected for Elo.
  86                 var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
  87                 win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
  88                 white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
  89                 win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
  90                 add_td(tr, ((100.0 * win_ratio).toFixed(1) + "%"));
  91
  92                 if (false) {
  93                         // Win bars (W/D/B).
  94                         var winbar_td = document.createElement("td");
  95                         $(winbar_td).addClass("winbars");
  96                         tr.appendChild(winbar_td);
  97                         var winbar_table = document.createElement("table");
  98                         winbar_td.appendChild(winbar_table);
  99                         var winbar_tr = document.createElement("tr");
 100                         winbar_table.appendChild(winbar_tr);
 101
 102                         if (white > 0) {
 103                                 var white_percent = (100.0 * white / num).toFixed(0) + "%";
 104                                 var white_td = document.createElement("td");
 105                                 winbar_tr.appendChild(white_td);
 106                                 $(white_td).addClass("white");
 107                                 white_td.style.width = white_percent;
 108                                 $(white_td).text(white_percent);
 109                         }
 110                         if (draw > 0) {
 111                                 var draw_percent = (100.0 * draw / num).toFixed(0) + "%";
 112                                 var draw_td = document.createElement("td");
 113                                 winbar_tr.appendChild(draw_td);
 114                                 $(draw_td).addClass("draw");
 115                                 draw_td.style.width = draw_percent;
 116                                 $(draw_td).text(draw_percent);
 117                         }
 118                         if (black > 0) {
 119                                 var black_percent = (100.0 * black / num).toFixed(0) + "%";
 120                                 var black_td = document.createElement("td");
 121                                 winbar_tr.appendChild(black_td);
 122                                 $(black_td).addClass("black");
 123                                 black_td.style.width = black_percent;
 124                                 $(black_td).text(black_percent);
 125                         }
 126                 }
 127
 128                 tbl.append(tr);
 129         }
 130 }
 131
 132 var make_move = function(move) {
 133         moves.length = move_override;
 134         moves.push(move);
 135         move_override = moves.length;
 136         update();
 137 }
 138 window['make_move'] = make_move;
 139
 140 var prev_move = function() {
 141         if (move_override > 0) {
 142                 --move_override;
 143                 update();
 144         }
 145 }
 146 window['prev_move'] = prev_move;
 147
 148 var next_move = function() {
 149         if (move_override < moves.length) {
 150                 ++move_override;
 151                 update();
 152         }
 153 }
 154 window['next_move'] = next_move;
 155
 156 // almost all of this stuff comes from the chessboard.js example page
 157 var onDragStart = function(source, piece, position, orientation) {
 158         var game = get_game();
 159         if (game.game_over() === true ||
 160             (game.turn() === 'w' && piece.search(/^b/) !== -1) ||
 161             (game.turn() === 'b' && piece.search(/^w/) !== -1)) {
 162                 return false;
 163         }
 164 }
 165
 166 var onDrop = function(source, target) {
 167         // see if the move is legal
 168         var game = get_game();
 169         var move = game.move({
 170                 from: source,
 171                 to: target,
 172                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 173         });
 174
 175         // illegal move
 176         if (move === null) return 'snapback';
 177
 178         moves = game.history({ verbose: true });
 179         move_override = moves.length;
 180 };
 181
 182 // update the board position after the piece snap
 183 // for castling, en passant, pawn promotion
 184 var onSnapEnd = function() {
 185         var game = get_game();
 186         board.position(game.fen());
 187         fetch_analysis();
 188 };
 189
 190 var init = function() {
 191         // Create board.
 192         board = new window.ChessBoard('board', {
 193                 draggable: true,
 194                 position: 'start',
 195                 onDragStart: onDragStart,
 196                 onDrop: onDrop,
 197                 onSnapEnd: onSnapEnd
 198         });
 199         update();
 200
 201         $(window).keyup(function(event) {
 202                 if (event.which == 39) {
 203                         next_move();
 204                 } else if (event.which == 37) {
 205                         prev_move();
 206                 }
 207         });
 208 }
 209
 210
 211 $(document).ready(init);
 212
 213 })();