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 TYPE_MOVE = 0;
  38 var TYPE_INTEGER = 1;
  39 var TYPE_FLOAT = 2;
  40 var TYPE_RATIO = 3;
  41
  42 var headings = [
  43         [ "Move", TYPE_MOVE ],
  44         [ "Games", TYPE_INTEGER ],
  45         [ "%", TYPE_RATIO ],
  46         [ "Win%", TYPE_RATIO ],
  47         [ "WWin", TYPE_INTEGER ],
  48         [ "%WW", TYPE_RATIO ],
  49         [ "Bwin", TYPE_INTEGER ],
  50         [ "%BW", TYPE_RATIO ],
  51         [ "Draw", TYPE_INTEGER ],
  52         [ "Draw%", TYPE_RATIO ],
  53         [ "AvWElo", TYPE_FLOAT ],
  54         [ "AvBElo", TYPE_FLOAT ],
  55         [ "EloVar", TYPE_FLOAT ],
  56         [ "AWin%", TYPE_RATIO ],
  57 ];
  58
  59 var show_lines = function(data, game) {
  60         var moves = data['moves'];
  61         $('#numviewers').text(data['opening']);
  62         var total_num = 0;
  63         for (var i = 0; i < moves.length; ++i) {
  64                 var move = moves[i];
  65                 total_num += parseInt(move['white']);
  66                 total_num += parseInt(move['draw']);
  67                 total_num += parseInt(move['black']);
  68         }
  69
  70         var headings_tr = $("#headings");
  71         headings_tr.empty();
  72         for (var i = 0; i < headings.length; ++i) {
  73                 var th = document.createElement("th");
  74                 headings_tr.append(th);
  75                 $(th).text(headings[i][0]);
  76         }
  77
  78         var lines = [];
  79         for (var i = 0; i < moves.length; ++i) {
  80                 var move = moves[i];
  81                 var line = [];
  82
  83                 var white = parseInt(move['white']);
  84                 var draw = parseInt(move['draw']);
  85                 var black = parseInt(move['black']);
  86
  87                 line.push(move['move']);  // Move.
  88                 var num = white + draw + black;
  89                 line.push(num);  // N.
  90                 line.push(num / total_num);  // %.
  91
  92                 // Win%.
  93                 var white_win_ratio = (white + 0.5 * draw) / num;
  94                 var win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
  95                 line.push(win_ratio);
  96
  97                 line.push(white);        // WWin.
  98                 line.push(white / num);  // %WW.
  99                 line.push(black);        // BWin.
 100                 line.push(black / num);  // %BW.
 101                 line.push(draw);         // Draw.
 102                 line.push(draw / num);   // %Draw.
 103
 104                 if (move['num_elo'] >= 10) {
 105                         // Elo.
 106                         line.push(move['white_avg_elo']);
 107                         line.push(move['black_avg_elo']);
 108                         line.push(move['white_avg_elo'] - move['black_avg_elo']);
 109
 110                         // Win% corrected for Elo.
 111                         var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 112                         win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 113                         white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 114                         win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
 115                         line.push(win_ratio);
 116                 } else {
 117                         line.push(null);
 118                         line.push(null);
 119                         line.push(null);
 120                         line.push(null);
 121                 }
 122                 lines.push(line);
 123         }
 124
 125         var tbl = $("#lines");
 126         tbl.empty();
 127
 128         for (var i = 0; i < moves.length; ++i) {
 129                 var line = lines[i];
 130                 var tr = document.createElement("tr");
 131
 132                 for (var j = 0; j < line.length; ++j) {
 133                         if (line[j] === null) {
 134                                 add_td(tr, "");
 135                         } else if (headings[j][1] == TYPE_MOVE) {
 136                                 var td = document.createElement("td");
 137                                 tr.appendChild(td);
 138                                 $(td).addClass("move");
 139                                 var move_a = document.createElement("a");
 140                                 move_a.href = "javascript:make_move('" + line[j] + "')";
 141                                 td.appendChild(move_a);
 142                                 $(move_a).text(line[j]);
 143                         } else if (headings[j][1] == TYPE_INTEGER) {
 144                                 add_td(tr, line[j]);
 145                         } else if (headings[j][1] == TYPE_FLOAT) {
 146                                 add_td(tr, line[j].toFixed(1));
 147                         } else {
 148                                 add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
 149                         }
 150                 }
 151
 152                 tbl.append(tr);
 153         }
 154 }
 155
 156 var make_move = function(move) {
 157         moves.length = move_override;
 158         moves.push(move);
 159         move_override = moves.length;
 160         update();
 161 }
 162 window['make_move'] = make_move;
 163
 164 var prev_move = function() {
 165         if (move_override > 0) {
 166                 --move_override;
 167                 update();
 168         }
 169 }
 170 window['prev_move'] = prev_move;
 171
 172 var next_move = function() {
 173         if (move_override < moves.length) {
 174                 ++move_override;
 175                 update();
 176         }
 177 }
 178 window['next_move'] = next_move;
 179
 180 // almost all of this stuff comes from the chessboard.js example page
 181 var onDragStart = function(source, piece, position, orientation) {
 182         var game = get_game();
 183         if (game.game_over() === true ||
 184             (game.turn() === 'w' && piece.search(/^b/) !== -1) ||
 185             (game.turn() === 'b' && piece.search(/^w/) !== -1)) {
 186                 return false;
 187         }
 188 }
 189
 190 var onDrop = function(source, target) {
 191         // see if the move is legal
 192         var game = get_game();
 193         var move = game.move({
 194                 from: source,
 195                 to: target,
 196                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 197         });
 198
 199         // illegal move
 200         if (move === null) return 'snapback';
 201
 202         moves = game.history({ verbose: true });
 203         move_override = moves.length;
 204 };
 205
 206 // update the board position after the piece snap
 207 // for castling, en passant, pawn promotion
 208 var onSnapEnd = function() {
 209         var game = get_game();
 210         board.position(game.fen());
 211         fetch_analysis();
 212 };
 213
 214 var init = function() {
 215         // Create board.
 216         board = new window.ChessBoard('board', {
 217                 draggable: true,
 218                 position: 'start',
 219                 onDragStart: onDragStart,
 220                 onDrop: onDrop,
 221                 onSnapEnd: onSnapEnd
 222         });
 223         update();
 224
 225         $(window).keyup(function(event) {
 226                 if (event.which == 39) {
 227                         next_move();
 228                 } else if (event.which == 37) {
 229                         prev_move();
 230                 }
 231         });
 232 }
 233
 234
 235 $(document).ready(init);
 236
 237 })();