X-Git-Url: https://git.sesse.net/?p=remoteglot;a=blobdiff_plain;f=www%2Fjs%2Fbook.js;fp=www%2Fjs%2Fbook.js;h=bed05c1de71c8011c197842597c81fa73a27f125;hp=0000000000000000000000000000000000000000;hb=7dfa8135cabec7261a2a255e7b5edd679e75da0b;hpb=7ac37d77ecacc4f33d8bc76d80e3fb6c7632fb92

diff --git a/www/js/book.js b/www/js/book.js
new file mode 100644
index 0000000..bed05c1
--- /dev/null
+++ b/www/js/book.js
@@ -0,0 +1,213 @@
+(function() {
+
+var board = null;
+var moves = [];
+var move_override = 0;
+
+var get_game = function() {
+	var game = new Chess();
+	for (var i = 0; i < move_override; ++i) {
+		game.move(moves[i]);
+	}
+	return game;
+}
+
+var update = function() {
+	var game = get_game();
+	board.position(game.fen());
+	fetch_analysis();
+}
+
+var fetch_analysis = function() {
+	var game = get_game();
+	$.ajax({
+		url: "/opening-stats.pl?fen=" + encodeURIComponent(game.fen())
+	}).done(function(data, textstatus, xhr) {
+		show_lines(data, game);
+	});
+}
+
+var add_td = function(tr, value) {
+	var td = document.createElement("td");
+	tr.appendChild(td);
+	$(td).addClass("num");
+	$(td).text(value);
+}
+
+var show_lines = function(data, game) {
+	var moves = data['moves'];
+	$('#numviewers').text(data['opening']);
+	var total_num = 0;
+	for (var i = 0; i < moves.length; ++i) {
+		var move = moves[i];
+		total_num += parseInt(move['white']);
+		total_num += parseInt(move['draw']);
+		total_num += parseInt(move['black']);
+	}	
+
+	var tbl = $("#lines");
+	tbl.empty();
+
+	for (var i = 0; i < moves.length; ++i) {
+		var move = moves[i];
+		var tr = document.createElement("tr");
+
+		var white = parseInt(move['white']);
+		var draw = parseInt(move['draw']);
+		var black = parseInt(move['black']);
+
+		// Move.
+		var move_td = document.createElement("td");
+		tr.appendChild(move_td);
+		$(move_td).addClass("move");
+
+		var move_a = document.createElement("a");
+		move_a.href = "javascript:make_move('" + move['move'] + "')";
+		move_td.appendChild(move_a);
+		$(move_a).text(move['move']);
+
+		// #.
+		var num = white + draw + black;
+		add_td(tr, num);
+
+		// %.
+		add_td(tr, (100.0 * num / total_num).toFixed(1) + "%");
+
+		// Win%.
+		var white_win_ratio = (white + 0.5 * draw) / num;
+		var win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
+		add_td(tr, ((100.0 * win_ratio).toFixed(1) + "%"));
+
+		// Elo.
+		add_td(tr, move['white_avg_elo'].toFixed(1));
+		add_td(tr, move['black_avg_elo'].toFixed(1));
+
+		// Win% corrected for Elo.
+		var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
+		win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
+		white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
+		win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
+		add_td(tr, ((100.0 * win_ratio).toFixed(1) + "%"));
+
+		if (false) {
+			// Win bars (W/D/B).
+			var winbar_td = document.createElement("td");
+			$(winbar_td).addClass("winbars");
+			tr.appendChild(winbar_td);
+			var winbar_table = document.createElement("table");
+			winbar_td.appendChild(winbar_table);
+			var winbar_tr = document.createElement("tr");
+			winbar_table.appendChild(winbar_tr);
+
+			if (white > 0) {
+				var white_percent = (100.0 * white / num).toFixed(0) + "%";
+				var white_td = document.createElement("td");
+				winbar_tr.appendChild(white_td);
+				$(white_td).addClass("white");
+				white_td.style.width = white_percent;
+				$(white_td).text(white_percent);
+			}
+			if (draw > 0) {
+				var draw_percent = (100.0 * draw / num).toFixed(0) + "%";
+				var draw_td = document.createElement("td");
+				winbar_tr.appendChild(draw_td);
+				$(draw_td).addClass("draw");
+				draw_td.style.width = draw_percent;
+				$(draw_td).text(draw_percent);
+			}
+			if (black > 0) {
+				var black_percent = (100.0 * black / num).toFixed(0) + "%";
+				var black_td = document.createElement("td");
+				winbar_tr.appendChild(black_td);
+				$(black_td).addClass("black");
+				black_td.style.width = black_percent;
+				$(black_td).text(black_percent);
+			}
+		}
+
+		tbl.append(tr);
+	}
+}
+
+var make_move = function(move) {
+	moves.length = move_override;
+	moves.push(move);
+	move_override = moves.length;
+	update();
+}
+window['make_move'] = make_move;
+
+var prev_move = function() {
+	if (move_override > 0) {
+		--move_override;
+		update();
+	}
+}
+window['prev_move'] = prev_move;
+
+var next_move = function() {
+	if (move_override < moves.length) {
+		++move_override;
+		update();
+	}
+}
+window['next_move'] = next_move;
+
+// almost all of this stuff comes from the chessboard.js example page
+var onDragStart = function(source, piece, position, orientation) {
+	var game = get_game();
+	if (game.game_over() === true ||
+	    (game.turn() === 'w' && piece.search(/^b/) !== -1) ||
+	    (game.turn() === 'b' && piece.search(/^w/) !== -1)) {
+		return false;
+	}
+}
+
+var onDrop = function(source, target) {
+	// see if the move is legal
+	var game = get_game();
+	var move = game.move({
+		from: source,
+		to: target,
+		promotion: 'q' // NOTE: always promote to a queen for example simplicity
+	});
+
+	// illegal move
+	if (move === null) return 'snapback';
+
+	moves = game.history({ verbose: true });
+	move_override = moves.length;
+};
+
+// update the board position after the piece snap 
+// for castling, en passant, pawn promotion
+var onSnapEnd = function() {
+	var game = get_game();
+	board.position(game.fen());
+	fetch_analysis();
+};
+
+var init = function() {
+	// Create board.
+	board = new window.ChessBoard('board', {
+		draggable: true,
+		position: 'start',
+		onDragStart: onDragStart,
+		onDrop: onDrop,
+		onSnapEnd: onSnapEnd
+	});
+	update();
+
+	$(window).keyup(function(event) {
+		if (event.which == 39) {
+			next_move();
+		} else if (event.which == 37) {
+			prev_move();
+		}
+	});
+}
+
+
+$(document).ready(init);
+
+})();