var board = null;
var hiddenboard = null;
var arrows = [];
var arrow_targets = [];
var occupied_by_arrows = [];
var refutation_lines = [];
var move_num = 1;
var toplay = 'W';
var ims = 0;
var sort_refutation_lines_by_score = 0;
var highlight_from = undefined;
var highlight_to = undefined;
var unique = Math.random();
var fen = null;
var display_lines = [];
var current_display_line = null;
var current_display_move = null;
var request_update = function(board) {
$.ajax({
url: "http://analysis.sesse.net/analysis.pl?ims=" + ims + "&unique=" + unique
//url: "http://analysis.sesse.net:5000/analysis.pl?ims=" + ims + "&unique=" + unique
}).done(function(data, textstatus, xhr) {
ims = xhr.getResponseHeader('X-Remoteglot-Last-Modified');
var num_viewers = xhr.getResponseHeader('X-Remoteglot-Num-Viewers');
update_board(board, data, num_viewers);
}).fail(function() {
// Wait ten seconds, then try again.
setTimeout(function() { request_update(board); }, 10000);
});
}
var clear_arrows = function() {
for (var i = 0; i < arrows.length; ++i) {
jsPlumb.detach(arrows[i].connection1);
jsPlumb.detach(arrows[i].connection2);
}
arrows = [];
for (var i = 0; i < arrow_targets.length; ++i) {
document.body.removeChild(arrow_targets[i]);
}
arrow_targets = [];
occupied_by_arrows = [];
for (var y = 0; y < 8; ++y) {
occupied_by_arrows.push([false, false, false, false, false, false, false, false]);
}
}
var redraw_arrows = function() {
for (var i = 0; i < arrows.length; ++i) {
position_arrow(arrows[i]);
}
}
var sign = function(x) {
if (x > 0) {
return 1;
} else if (x < 0) {
return -1;
} else {
return 0;
}
}
// See if drawing this arrow on the board would cause unduly amount of confusion.
var interfering_arrow = function(from, to) {
var from_col = from.charCodeAt(0) - "a1".charCodeAt(0);
var from_row = from.charCodeAt(1) - "a1".charCodeAt(1);
var to_col = to.charCodeAt(0) - "a1".charCodeAt(0);
var to_row = to.charCodeAt(1) - "a1".charCodeAt(1);
occupied_by_arrows[from_row][from_col] = true;
// Knight move: Just check that we haven't been at the destination before.
if ((Math.abs(to_col - from_col) == 2 && Math.abs(to_row - from_row) == 1) ||
(Math.abs(to_col - from_col) == 1 && Math.abs(to_row - from_row) == 2)) {
return occupied_by_arrows[to_row][to_col];
}
// Sliding piece: Check if anything except the from-square is seen before.
var dx = sign(to_col - from_col);
var dy = sign(to_row - from_row);
var x = from_col;
var y = from_row;
do {
x += dx;
y += dy;
if (occupied_by_arrows[y][x]) {
return true;
}
occupied_by_arrows[y][x] = true;
} while (x != to_col || y != to_row);
return false;
}
var add_target = function() {
var elem = document.createElement("div");
$(elem).addClass("window");
elem.id = "target" + arrow_targets.length;
document.body.appendChild(elem);
arrow_targets.push(elem);
return elem.id;
}
var position_arrow = function(arrow) {
var zoom_factor = $("#board").width() / 400.0;
var line_width = arrow.line_width * zoom_factor;
var arrow_size = arrow.arrow_size * zoom_factor;
var square_width = $(".square-a8").width();
var from_y = (7 - arrow.from_row + 0.5)*square_width;
var to_y = (7 - arrow.to_row + 0.5)*square_width;
var from_x = (arrow.from_col + 0.5)*square_width;
var to_x = (arrow.to_col + 0.5)*square_width;
var dx = to_x - from_x;
var dy = to_y - from_y;
var len = Math.sqrt(dx * dx + dy * dy);
dx /= len;
dy /= len;
var pos = $(".square-a8").position();
$("#" + arrow.s1).css({ top: pos.top + from_y + (0.5 * arrow_size) * dy, left: pos.left + from_x + (0.5 * arrow_size) * dx });
$("#" + arrow.d1).css({ top: pos.top + to_y - (0.5 * arrow_size) * dy, left: pos.left + to_x - (0.5 * arrow_size) * dx });
$("#" + arrow.s1v).css({ top: pos.top + from_y - 0 * dy, left: pos.left + from_x - 0 * dx });
$("#" + arrow.d1v).css({ top: pos.top + to_y + 0 * dy, left: pos.left + to_x + 0 * dx });
if (arrow.connection1) {
jsPlumb.detach(arrow.connection1);
}
if (arrow.connection2) {
jsPlumb.detach(arrow.connection2);
}
if (current_display_line !== null) {
delete arrow.connection1;
delete arrow.connection2;
return;
}
arrow.connection1 = jsPlumb.connect({
source: arrow.s1,
target: arrow.d1,
connector:["Straight"],
cssClass:"c1",
endpoint:"Blank",
endpointClass:"c1Endpoint",
anchor:"Continuous",
paintStyle:{
lineWidth:line_width,
strokeStyle:arrow.fg_color,
outlineWidth:1,
outlineColor:"#666",
opacity:"60%"
}
});
arrow.connection2 = jsPlumb.connect({
source: arrow.s1v,
target: arrow.d1v,
connector:["Straight"],
cssClass:"vir",
endpoint:"Blank",
endpointClass:"c1Endpoint",
anchor:"Continuous",
paintStyle:{
lineWidth:0,
strokeStyle:arrow.fg_color,
outlineWidth:0,
outlineColor:"#666",
},
overlays : [
["Arrow", {
cssClass:"l1arrow",
location:1.0,
width: arrow_size,
length: arrow_size,
paintStyle: {
lineWidth:line_width,
strokeStyle:"#000",
},
}]
]
});
}
var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_size) {
var from_col = from_square.charCodeAt(0) - "a1".charCodeAt(0);
var from_row = from_square.charCodeAt(1) - "a1".charCodeAt(1);
var to_col = to_square.charCodeAt(0) - "a1".charCodeAt(0);
var to_row = to_square.charCodeAt(1) - "a1".charCodeAt(1);
// Create arrow.
var arrow = {
s1: add_target(),
d1: add_target(),
s1v: add_target(),
d1v: add_target(),
from_col: from_col,
from_row: from_row,
to_col: to_col,
to_row: to_row,
line_width: line_width,
arrow_size: arrow_size,
fg_color: fg_color
};
position_arrow(arrow);
arrows.push(arrow);
}
var compare_by_sort_key = function(refutation_lines, toplay, a, b) {
var ska = refutation_lines[a].sort_key;
var skb = refutation_lines[b].sort_key;
if (ska < skb) return -1;
if (ska > skb) return 1;
return 0;
};
var compare_by_score = function(refutation_lines, toplay, a, b) {
var sa = parseInt(refutation_lines[b].score_sort_key);
var sb = parseInt(refutation_lines[a].score_sort_key);
if (toplay == 'B') {
return sb - sa;
} else {
return sa - sb;
}
}
// Fake multi-PV using the refutation lines. Find all “relevant” moves,
// sorted by quality, descending.
var find_nonstupid_moves = function(data, margin) {
// First of all, if there are any moves that are more than 0.5 ahead of
// the primary move, the refutation lines are probably bunk, so just
// kill them all.
var best_score = undefined;
var pv_score = undefined;
for (var move in data.refutation_lines) {
var score = parseInt(data.refutation_lines[move].score_sort_key);
if (move == data.pv_uci[0]) {
pv_score = score;
}
if (best_score === undefined || score > best_score) {
best_score = score;
}
if (!(data.refutation_lines[move].depth >= 8)) {
return [];
}
}
if (best_score - pv_score > 50) {
return [];
}
// Now find all moves that are within “margin” of the best score.
// The PV move will always be first.
var moves = [];
for (var move in data.refutation_lines) {
var score = parseInt(data.refutation_lines[move].score_sort_key);
if (move != data.pv_uci[0] && best_score - score <= margin) {
moves.push(move);
}
}
moves = moves.sort(function(a, b) { return compare_by_score(data.refutation_lines, a, b) });
moves.unshift(data.pv_uci[0]);
return moves;
}
var thousands = function(x) {
return String(x).split('').reverse().join('').replace(/(\d{3}\B)/g, '$1,').split('').reverse().join('');
}
var print_pv = function(fen, uci_pv, pretty_pv, move_num, toplay, limit) {
display_lines.push({
start_fen: fen,
uci_pv: uci_pv,
pretty_pv: pretty_pv
});
var pv = '';
var i = 0;
if (toplay == 'B') {
var move = "" + pretty_pv[0] + "";
pv = move_num + '. … ' + move;
toplay = 'W';
++i;
}
++move_num;
for ( ; i < pretty_pv.length; ++i) {
var move = "" + pretty_pv[i] + "";
if (toplay == 'W') {
if (i > limit) {
return pv + ' (…)';
}
if (pv != '') {
pv += ' ';
}
pv += move_num + '. ' + move;
++move_num;
toplay = 'B';
} else {
pv += ' ' + move;
toplay = 'W';
}
}
return pv;
}
var update_highlight = function() {
$("#board").find('.square-55d63').removeClass('nonuglyhighlight');
if (current_display_line === null && highlight_from !== undefined && highlight_to !== undefined) {
$("#board").find('.square-' + highlight_from).addClass('nonuglyhighlight');
$("#board").find('.square-' + highlight_to).addClass('nonuglyhighlight');
}
}
var update_refutation_lines = function(board) {
var tbl = $("#refutationlines");
tbl.empty();
moves = [];
for (var move in refutation_lines) {
moves.push(move);
}
var compare = sort_refutation_lines_by_score ? compare_by_score : compare_by_sort_key;
moves = moves.sort(function(a, b) { return compare(refutation_lines, toplay, a, b) });
for (var i = 0; i < moves.length; ++i) {
var line = refutation_lines[moves[i]];
var tr = document.createElement("tr");
var move_td = document.createElement("td");
tr.appendChild(move_td);
$(move_td).addClass("move");
if (line.pv_uci.length == 0) {
$(move_td).text(line.pretty_move);
} else {
var move = "" + line.pretty_move + "";
$(move_td).html(move);
}
var score_td = document.createElement("td");
tr.appendChild(score_td);
$(score_td).addClass("score");
$(score_td).text(line.pretty_score);
var depth_td = document.createElement("td");
tr.appendChild(depth_td);
$(depth_td).addClass("depth");
$(depth_td).text("d" + line.depth);
var pv_td = document.createElement("td");
tr.appendChild(pv_td);
$(pv_td).addClass("pv");
$(pv_td).html(print_pv(fen, line.pv_uci, line.pv_pretty, move_num, toplay, 10));
tbl.append(tr);
}
// Make one of the links clickable and the other nonclickable.
if (sort_refutation_lines_by_score) {
$("#sortbyscore0").html("Move");
$("#sortbyscore1").html("Score");
} else {
$("#sortbyscore0").html("Move");
$("#sortbyscore1").html("Score");
}
}
var update_board = function(board, data, num_viewers) {
// The headline.
var headline = 'Analysis';
if (data.position.last_move !== 'none') {
headline += ' after ' + data.position.move_num + '. ';
if (data.position.toplay == 'W') {
headline += '… ';
}
headline += data.position.last_move;
}
$("#headline").text(headline);
if (num_viewers === null) {
$("#numviewers").text("");
} else if (num_viewers == 1) {
$("#numviewers").text("You are the only current viewer");
} else {
$("#numviewers").text(num_viewers + " current viewers");
}
// The score.
if (data.score !== null) {
$("#score").text(data.score);
}
// The search stats.
if (data.nodes && data.nps && data.depth) {
var stats = thousands(data.nodes) + ' nodes, ' + thousands(data.nps) + ' nodes/sec, depth ' + data.depth + ' ply';
if (data.seldepth) {
stats += ' (' + data.seldepth + ' selective)';
}
if (data.tbhits && data.tbhits > 0) {
if (data.tbhits == 1) {
stats += ', one Nalimov hit';
} else {
stats += ', ' + data.tbhits + ' Nalimov hits';
}
}
$("#searchstats").text(stats);
}
// Update the board itself.
fen = data.position.fen;
update_displayed_line();
if (data.position.last_move_uci) {
highlight_from = data.position.last_move_uci.substr(0, 2);
highlight_to = data.position.last_move_uci.substr(2, 4);
} else {
highlight_from = highlight_to = undefined;
}
update_highlight();
// Print the PV.
$("#pv").html(print_pv(data.position.fen, data.pv_uci, data.pv_pretty, data.position.move_num, data.position.toplay));
// Update the PV arrow.
clear_arrows();
if (data.pv_uci.length >= 1) {
// draw a continuation arrow as long as it's the same piece
for (var i = 0; i < data.pv_uci.length; i += 2) {
var from = data.pv_uci[i].substr(0, 2);
var to = data.pv_uci[i].substr(2,4);
if ((i >= 2 && from != data.pv_uci[i - 2].substr(2, 4)) ||
interfering_arrow(from, to)) {
break;
}
create_arrow(from, to, '#f66', 6, 20);
}
var alt_moves = find_nonstupid_moves(data, 30);
for (var i = 1; i < alt_moves.length && i < 3; ++i) {
create_arrow(alt_moves[i].substr(0, 2),
alt_moves[i].substr(2, 4), '#f66', 1, 10);
}
}
// See if all semi-reasonable moves have only one possible response.
if (data.pv_uci.length >= 2) {
var nonstupid_moves = find_nonstupid_moves(data, 300);
var response = data.pv_uci[1];
for (var i = 0; i < nonstupid_moves.length; ++i) {
if (nonstupid_moves[i] == data.pv_uci[0]) {
// ignore the PV move for refutation lines.
continue;
}
if (!data.refutation_lines ||
!data.refutation_lines[nonstupid_moves[i]] ||
!data.refutation_lines[nonstupid_moves[i]].pv_uci ||
data.refutation_lines[nonstupid_moves[i]].pv_uci.length < 1) {
// Incomplete PV, abort.
response = undefined;
break;
}
var this_response = data.refutation_lines[nonstupid_moves[i]].pv_uci[1];
if (response !== this_response) {
// Different response depending on lines, abort.
response = undefined;
break;
}
}
if (nonstupid_moves.length > 0 && response !== undefined) {
create_arrow(response.substr(0, 2),
response.substr(2, 4), '#66f', 6, 20);
}
}
// Update the refutation lines.
fen = data.position.fen;
move_num = data.position.move_num;
toplay = data.position.toplay;
refutation_lines = data.refutation_lines;
update_refutation_lines(board);
// Next update.
setTimeout(function() { request_update(board); }, 100);
}
var resort_refutation_lines = function(sort_by_score) {
sort_refutation_lines_by_score = sort_by_score;
update_refutation_lines(board);
}
var show_line = function(line_num, move_num) {
if (line_num == -1) {
current_display_line = null;
current_display_move = null;
} else {
current_display_line = display_lines[line_num];
current_display_move = move_num;
}
update_displayed_line();
update_highlight();
redraw_arrows();
}
var prev_move = function() {
--current_display_move;
update_displayed_line();
}
var next_move = function() {
++current_display_move;
update_displayed_line();
}
var update_displayed_line = function() {
if (current_display_line === null) {
$("#linenav").hide();
$("#linemsg").show();
board.position(fen);
return;
}
$("#linenav").show();
$("#linemsg").hide();
if (current_display_move == 0) {
$("#prevmove").html("Previous");
} else {
$("#prevmove").html("Previous");
}
if (current_display_move == current_display_line.uci_pv.length - 1) {
$("#nextmove").html("Next");
} else {
$("#nextmove").html("Next");
}
hiddenboard.position(current_display_line.start_fen, false);
for (var i = 0; i <= current_display_move; ++i) {
var move = current_display_line.uci_pv[i];
move = move.substr(0, 2) + "-" + move.substr(2, 4);
hiddenboard.move(move, false);
}
board.position(hiddenboard.position());
}
var init = function() {
// Create board.
board = new ChessBoard('board', 'start');
hiddenboard = new ChessBoard('hiddenboard', 'start');
request_update(board);
$(window).resize(function() {
board.resize();
update_highlight();
redraw_arrows();
});
};
$(document).ready(init);