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 var sort_by = 1;
  59
  60 var show_lines = function(data, game) {
  61         var moves = data['moves'];
  62         $('#numviewers').text(data['opening']);
  63         var total_num = 0;
  64         for (var i = 0; i < moves.length; ++i) {
  65                 var move = moves[i];
  66                 total_num += parseInt(move['white']);
  67                 total_num += parseInt(move['draw']);
  68                 total_num += parseInt(move['black']);
  69         }
  70
  71         var headings_tr = $("#headings");
  72         headings_tr.empty();
  73         for (var i = 0; i < headings.length; ++i) {
  74                 var th = document.createElement("th");
  75                 headings_tr.append(th);
  76                 $(th).text(headings[i][0]);
  77                 (function(new_sort_by) {
  78                         $(th).click(function() {
  79                                 sort_by = new_sort_by;
  80                                 show_lines(data, game);
  81                         });
  82                 })(i);
  83         }
  84
  85         var lines = [];
  86         for (var i = 0; i < moves.length; ++i) {
  87                 var move = moves[i];
  88                 var line = [];
  89
  90                 var white = parseInt(move['white']);
  91                 var draw = parseInt(move['draw']);
  92                 var black = parseInt(move['black']);
  93
  94                 line.push(move['move']);  // Move.
  95                 var num = white + draw + black;
  96                 line.push(num);  // N.
  97                 line.push(num / total_num);  // %.
  98
  99                 // Win%.
 100                 var white_win_ratio = (white + 0.5 * draw) / num;
 101                 var win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
 102                 line.push(win_ratio);
 103
 104                 line.push(white);        // WWin.
 105                 line.push(white / num);  // %WW.
 106                 line.push(black);        // BWin.
 107                 line.push(black / num);  // %BW.
 108                 line.push(draw);         // Draw.
 109                 line.push(draw / num);   // %Draw.
 110
 111                 if (move['num_elo'] >= 10) {
 112                         // Elo.
 113                         line.push(move['white_avg_elo']);
 114                         line.push(move['black_avg_elo']);
 115                         line.push(move['white_avg_elo'] - move['black_avg_elo']);
 116
 117                         // Win% corrected for Elo.
 118                         var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 119                         win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 120                         white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 121                         win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
 122                         line.push(win_ratio);
 123                 } else {
 124                         line.push(null);
 125                         line.push(null);
 126                         line.push(null);
 127                         line.push(null);
 128                 }
 129                 lines.push(line);
 130         }
 131
 132         lines.sort(function(a, b) { return b[sort_by] - a[sort_by]; });
 133
 134         var tbl = $("#lines");
 135         tbl.empty();
 136
 137         for (var i = 0; i < moves.length; ++i) {
 138                 var line = lines[i];
 139                 var tr = document.createElement("tr");
 140
 141                 for (var j = 0; j < line.length; ++j) {
 142                         if (line[j] === null) {
 143                                 add_td(tr, "");
 144                         } else if (headings[j][1] == TYPE_MOVE) {
 145                                 var td = document.createElement("td");
 146                                 tr.appendChild(td);
 147                                 $(td).addClass("move");
 148                                 var move_a = document.createElement("a");
 149                                 move_a.href = "javascript:make_move('" + line[j] + "')";
 150                                 td.appendChild(move_a);
 151                                 $(move_a).text(line[j]);
 152                         } else if (headings[j][1] == TYPE_INTEGER) {
 153                                 add_td(tr, line[j]);
 154                         } else if (headings[j][1] == TYPE_FLOAT) {
 155                                 add_td(tr, line[j].toFixed(1));
 156                         } else {
 157                                 add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
 158                         }
 159                 }
 160
 161                 tbl.append(tr);
 162         }
 163 }
 164
 165 var make_move = function(move) {
 166         moves.length = move_override;
 167         moves.push(move);
 168         move_override = moves.length;
 169         update();
 170 }
 171 window['make_move'] = make_move;
 172
 173 var prev_move = function() {
 174         if (move_override > 0) {
 175                 --move_override;
 176                 update();
 177         }
 178 }
 179 window['prev_move'] = prev_move;
 180
 181 var next_move = function() {
 182         if (move_override < moves.length) {
 183                 ++move_override;
 184                 update();
 185         }
 186 }
 187 window['next_move'] = next_move;
 188
 189 // almost all of this stuff comes from the chessboard.js example page
 190 var onDragStart = function(source, piece, position, orientation) {
 191         var game = get_game();
 192         if (game.game_over() === true ||
 193             (game.turn() === 'w' && piece.search(/^b/) !== -1) ||
 194             (game.turn() === 'b' && piece.search(/^w/) !== -1)) {
 195                 return false;
 196         }
 197 }
 198
 199 var onDrop = function(source, target) {
 200         // see if the move is legal
 201         var game = get_game();
 202         var move = game.move({
 203                 from: source,
 204                 to: target,
 205                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 206         });
 207
 208         // illegal move
 209         if (move === null) return 'snapback';
 210
 211         moves = game.history({ verbose: true });
 212         move_override = moves.length;
 213 };
 214
 215 // update the board position after the piece snap
 216 // for castling, en passant, pawn promotion
 217 var onSnapEnd = function() {
 218         var game = get_game();
 219         board.position(game.fen());
 220         fetch_analysis();
 221 };
 222
 223 var init = function() {
 224         // Create board.
 225         board = new window.ChessBoard('board', {
 226                 draggable: true,
 227                 position: 'start',
 228                 onDragStart: onDragStart,
 229                 onDrop: onDrop,
 230                 onSnapEnd: onSnapEnd
 231         });
 232         update();
 233
 234         $(window).keyup(function(event) {
 235                 if (event.which == 39) {
 236                         next_move();
 237                 } else if (event.which == 37) {
 238                         prev_move();
 239                 }
 240         });
 241 }
 242
 243
 244 $(document).ready(init);
 245
 246 })();