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 var direction = 1;
  60
  61 var show_lines = function(data, game) {
  62         var moves = data['moves'];
  63         $('#numviewers').text(data['opening']);
  64         var total_num = 0;
  65         for (var i = 0; i < moves.length; ++i) {
  66                 var move = moves[i];
  67                 total_num += parseInt(move['white']);
  68                 total_num += parseInt(move['draw']);
  69                 total_num += parseInt(move['black']);
  70         }
  71
  72         var headings_tr = $("#headings");
  73         headings_tr.empty();
  74         for (var i = 0; i < headings.length; ++i) {
  75                 var th = document.createElement("th");
  76                 headings_tr.append(th);
  77                 $(th).text(headings[i][0]);
  78                 (function(new_sort_by) {
  79                         $(th).click(function() {
  80                                 if (sort_by == new_sort_by) {
  81                                         direction = -direction;
  82                                 } else {
  83                                         sort_by = new_sort_by;
  84                                         direction = 1;
  85                                 }
  86                                 show_lines(data, game);
  87                         });
  88                 })(i);
  89         }
  90
  91         var lines = [];
  92         for (var i = 0; i < moves.length; ++i) {
  93                 var move = moves[i];
  94                 var line = [];
  95
  96                 var white = parseInt(move['white']);
  97                 var draw = parseInt(move['draw']);
  98                 var black = parseInt(move['black']);
  99
 100                 line.push(move['move']);  // Move.
 101                 var num = white + draw + black;
 102                 line.push(num);  // N.
 103                 line.push(num / total_num);  // %.
 104
 105                 // Win%.
 106                 var white_win_ratio = (white + 0.5 * draw) / num;
 107                 var win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
 108                 line.push(win_ratio);
 109
 110                 line.push(white);        // WWin.
 111                 line.push(white / num);  // %WW.
 112                 line.push(black);        // BWin.
 113                 line.push(black / num);  // %BW.
 114                 line.push(draw);         // Draw.
 115                 line.push(draw / num);   // %Draw.
 116
 117                 if (move['num_elo'] >= 10) {
 118                         // Elo.
 119                         line.push(move['white_avg_elo']);
 120                         line.push(move['black_avg_elo']);
 121                         line.push(move['white_avg_elo'] - move['black_avg_elo']);
 122
 123                         // Win% corrected for Elo.
 124                         var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 125                         win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 126                         white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 127                         win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
 128                         line.push(win_ratio);
 129                 } else {
 130                         line.push(null);
 131                         line.push(null);
 132                         line.push(null);
 133                         line.push(null);
 134                 }
 135                 lines.push(line);
 136         }
 137
 138         lines.sort(function(a, b) { return direction * ( b[sort_by] - a[sort_by]); });
 139
 140         var tbl = $("#lines");
 141         tbl.empty();
 142
 143         for (var i = 0; i < moves.length; ++i) {
 144                 var line = lines[i];
 145                 var tr = document.createElement("tr");
 146
 147                 for (var j = 0; j < line.length; ++j) {
 148                         if (line[j] === null) {
 149                                 add_td(tr, "");
 150                         } else if (headings[j][1] == TYPE_MOVE) {
 151                                 var td = document.createElement("td");
 152                                 tr.appendChild(td);
 153                                 $(td).addClass("move");
 154                                 var move_a = document.createElement("a");
 155                                 move_a.href = "javascript:make_move('" + line[j] + "')";
 156                                 td.appendChild(move_a);
 157                                 $(move_a).text(line[j]);
 158                         } else if (headings[j][1] == TYPE_INTEGER) {
 159                                 add_td(tr, line[j]);
 160                         } else if (headings[j][1] == TYPE_FLOAT) {
 161                                 add_td(tr, line[j].toFixed(1));
 162                         } else {
 163                                 add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
 164                         }
 165                 }
 166
 167                 tbl.append(tr);
 168         }
 169 }
 170
 171 var make_move = function(move) {
 172         moves.length = move_override;
 173         moves.push(move);
 174         move_override = moves.length;
 175         update();
 176 }
 177 window['make_move'] = make_move;
 178
 179 var prev_move = function() {
 180         if (move_override > 0) {
 181                 --move_override;
 182                 update();
 183         }
 184 }
 185 window['prev_move'] = prev_move;
 186
 187 var next_move = function() {
 188         if (move_override < moves.length) {
 189                 ++move_override;
 190                 update();
 191         }
 192 }
 193 window['next_move'] = next_move;
 194
 195 // almost all of this stuff comes from the chessboard.js example page
 196 var onDragStart = function(source, piece, position, orientation) {
 197         var game = get_game();
 198         if (game.game_over() === true ||
 199             (game.turn() === 'w' && piece.search(/^b/) !== -1) ||
 200             (game.turn() === 'b' && piece.search(/^w/) !== -1)) {
 201                 return false;
 202         }
 203 }
 204
 205 var onDrop = function(source, target) {
 206         // see if the move is legal
 207         var game = get_game();
 208         var move = game.move({
 209                 from: source,
 210                 to: target,
 211                 promotion: 'q' // NOTE: always promote to a queen for example simplicity
 212         });
 213
 214         // illegal move
 215         if (move === null) return 'snapback';
 216
 217         moves = game.history({ verbose: true });
 218         move_override = moves.length;
 219 };
 220
 221 // update the board position after the piece snap
 222 // for castling, en passant, pawn promotion
 223 var onSnapEnd = function() {
 224         var game = get_game();
 225         board.position(game.fen());
 226         fetch_analysis();
 227 };
 228
 229 var init = function() {
 230         // Create board.
 231         board = new window.ChessBoard('board', {
 232                 draggable: true,
 233                 position: 'start',
 234                 onDragStart: onDragStart,
 235                 onDrop: onDrop,
 236                 onSnapEnd: onSnapEnd
 237         });
 238         update();
 239
 240         $(window).keyup(function(event) {
 241                 if (event.which == 39) {
 242                         next_move();
 243                 } else if (event.which == 37) {
 244                         prev_move();
 245                 }
 246         });
 247 }
 248
 249
 250 $(document).ready(init);
 251
 252 })();