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 headings = [
  38         "Move", "Games", "%", "Win%", "WWin", "%WW", "Bwin", "%BW", "Draw", "Draw%",
  39         "AvWElo", "AvBElo", "EloVar", "AWin%"
  40 ];
  41
  42 var show_lines = function(data, game) {
  43         var moves = data['moves'];
  44         $('#numviewers').text(data['opening']);
  45         var total_num = 0;
  46         for (var i = 0; i < moves.length; ++i) {
  47                 var move = moves[i];
  48                 total_num += parseInt(move['white']);
  49                 total_num += parseInt(move['draw']);
  50                 total_num += parseInt(move['black']);
  51         }
  52
  53         var headings_tr = $("#headings");
  54         headings_tr.empty();
  55         for (var i = 0; i < headings.length; ++i) {
  56                 var th = document.createElement("th");
  57                 headings_tr.append(th);
  58                 $(th).text(headings[i]);
  59         }
  60
  61         var tbl = $("#lines");
  62         tbl.empty();
  63
  64         for (var i = 0; i < moves.length; ++i) {
  65                 var move = moves[i];
  66                 var tr = document.createElement("tr");
  67
  68                 var white = parseInt(move['white']);
  69                 var draw = parseInt(move['draw']);
  70                 var black = parseInt(move['black']);
  71
  72                 // Move.
  73                 var move_td = document.createElement("td");
  74                 tr.appendChild(move_td);
  75                 $(move_td).addClass("move");
  76
  77                 var move_a = document.createElement("a");
  78                 move_a.href = "javascript:make_move('" + move['move'] + "')";
  79                 move_td.appendChild(move_a);
  80                 $(move_a).text(move['move']);
  81
  82                 // N.
  83                 var num = white + draw + black;
  84                 add_td(tr, num);
  85
  86                 // %.
  87                 add_td(tr, (100.0 * num / total_num).toFixed(1) + "%");
  88
  89                 // Win%.
  90                 var white_win_ratio = (white + 0.5 * draw) / num;
  91                 var win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
  92                 add_td(tr, ((100.0 * win_ratio).toFixed(1) + "%"));
  93
  94                 // WWin and %WW.
  95                 add_td(tr, white);
  96                 add_td(tr, (100.0 * white / num).toFixed(1) + "%");
  97
  98                 // BWin and %BW.
  99                 add_td(tr, black);
 100                 add_td(tr, (100.0 * black / num).toFixed(1) + "%");
 101
 102                 // Draw and %Draw.
 103                 add_td(tr, draw);
 104                 add_td(tr, ((100.0 * draw / num).toFixed(1) + "%"));
 105
 106                 if (move['num_elo'] >= 10) {
 107                         // Elo.
 108                         add_td(tr, move['white_avg_elo'].toFixed(1));
 109                         add_td(tr, move['black_avg_elo'].toFixed(1));
 110                         add_td(tr, (move['white_avg_elo'] - move['black_avg_elo']).toFixed(1));
 111
 112                         // Win% corrected for Elo.
 113                         var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
 114                         win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
 115                         white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
 116                         win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
 117                         add_td(tr, ((100.0 * win_ratio).toFixed(1) + "%"));
 118                 } else {
 119                         add_td(tr, "");
 120                         add_td(tr, "");
 121                         add_td(tr, "");
 122                         add_td(tr, "");
 123                 }
 124
 125                 if (false) {
 126                         // Win bars (W/D/B).
 127                         var winbar_td = document.createElement("td");
 128                         $(winbar_td).addClass("winbars");
 129                         tr.appendChild(winbar_td);
 130                         var winbar_table = document.createElement("table");
 131                         winbar_td.appendChild(winbar_table);
 132                         var winbar_tr = document.createElement("tr");
 133                         winbar_table.appendChild(winbar_tr);
 134
 135                         if (white > 0) {
 136                                 var white_percent = (100.0 * white / num).toFixed(0) + "%";
 137                                 var white_td = document.createElement("td");
 138                                 winbar_tr.appendChild(white_td);
 139                                 $(white_td).addClass("white");
 140                                 white_td.style.width = white_percent;
 141                                 $(white_td).text(white_percent);
 142                         }
 143                         if (draw > 0) {
 144                                 var draw_percent = (100.0 * draw / num).toFixed(0) + "%";
 145                                 var draw_td = document.createElement("td");
 146                                 winbar_tr.appendChild(draw_td);
 147                                 $(draw_td).addClass("draw");
 148                                 draw_td.style.width = draw_percent;
 149                                 $(draw_td).text(draw_percent);
 150                         }
 151                         if (black > 0) {
 152                                 var black_percent = (100.0 * black / num).toFixed(0) + "%";
 153                                 var black_td = document.createElement("td");
 154                                 winbar_tr.appendChild(black_td);
 155                                 $(black_td).addClass("black");
 156                                 black_td.style.width = black_percent;
 157                                 $(black_td).text(black_percent);
 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 })();