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+// @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL v3.0
+// Copyright (C) 2018  Nguyễn Gia Phong
+const PERIGON = Math.PI * 2;
+const TANGO = {'a': '#fce94f', 'b': '#edd400', 'c': '#c4a000',  // Butter
+               'd': '#fcaf3e', 'e': '#f57900', 'f': '#ce5c00',  // Orange
+               'g': '#e9b96e', 'h': '#c17d11', 'i': '#8f5902',  // Chocolate
+               'j': '#8ae234', 'k': '#73d216', 'l': '#4e9a06',  // Chameleon
+               'm': '#729fcf', 'n': '#3465a4', 'o': '#204a87',  // Sky Blue
+               'p': '#ad7fa8', 'q': '#75507b', 'r': '#5c3566',  // Plum
+               's': '#ef2929', 't': '#cc0000', 'u': '#a40000',  // Scarlet Red
+               'v': '#eeeeec', 'w': '#d3d7cf', 'x': '#babdb6',  // Aluminium
+               'y': '#888a85', 'z': '#555753', '0': '#2e3436'};
+var mw, mh;     // maze width and height in grids
+
+// Resize canvas to fit page.
+function resizeCanvas(canvas) {
+    canvas.width = window.innerWidth;
+    canvas.height = window.innerHeight;
+}
+
+// Draw on the given canvas a c-colored regular n-gon with circumradius of R,
+// center point I(x, y) and corner A that angle of vector IA is r (in radians).
+function drawPolygon(canvas, n, c, x, y, r, R) {
+    var ctx = canvas.getContext('2d');
+    ctx.beginPath();
+    r = r * Math.PI / 180 % PERIGON;
+    ctx.moveTo(x + R*Math.cos(r), y + R*Math.sin(r));
+    for (var i = 1; i < n; i++) {
+        r += PERIGON / n;
+        ctx.lineTo(x + R*Math.cos(r), y + R*Math.sin(r));
+    }
+    ctx.closePath();
+    ctx.fillStyle = TANGO[c];
+    ctx.fill();
+}
+
+// Draw the maze, hero, enemies and bullets of the given frame.
+function drawFrame(canvas, frame) {
+    var cw = canvas.width, ch = canvas.height;
+    var maze = frame.m;
+    if (maze) {
+        mw = maze[0].length;
+        mh = maze.length;
+    }
+    unit = Math.min(cw / (mw + 1), ch / (mh + 1));
+    eR = unit / Math.sqrt(2);
+    hR = unit * 2 / Math.pow(27, 0.25);
+    bR = unit / 4;
+
+    var hero = frame.h;
+    var x0 = cw/2 - hero[1]/100*unit, y0 = ch/2 - hero[2]/100*unit;
+
+    canvas.getContext('2d').clearRect(0, 0, cw, ch);
+    if (maze)
+    for (var row = 0; row < mh; row++)
+        for (var column = 0; column < mw; column++)
+            if (maze[row][column] != '0') {
+                var x = x0 + column*unit, y = y0 + row*unit;
+                var ctx = canvas.getContext('2d');
+                ctx.fillStyle = TANGO[maze[row][column]];
+                ctx.fillRect(x, y, unit + 1, unit + 1);
+            }
+
+    if (frame.e)
+        for (let enemy of frame.e)
+            drawPolygon(canvas, 4, enemy[0], x0 + enemy[1]/100*unit,
+                        y0 + enemy[2]/100*unit, enemy[3], eR);
+    drawPolygon(canvas, 4 - hero[5], hero[0], cw / 2, ch / 2, hero[3], hR);
+
+    if (frame.b)
+        for (let bullet of frame.b)
+            drawPolygon(canvas, 5, bullet[0], x0 + bullet[1]/100*unit,
+                        y0 + bullet[2]/100*unit, bullet[3], bR);
+}
+
+// Recursive function to loop with window.setTimeout.
+function playRecord(canvas, record, index) {
+    if (index >= record.length) {
+        document.title = 'Brutal Maze record player';
+        document.getElementById('input').style.display = '';
+        return;
+    }
+
+    frame = record[index];
+    document.title = `Score: ${frame.s}`;
+    setTimeout(function () {
+        drawFrame(canvas, frame);
+        playRecord(canvas, record, index + 1);
+    }, frame.t);
+}
+
+// Fetch JSON record and parse to playRecord.
+function playJSON() {
+    fetch(document.getElementById('record').value).then(function(res) {
+        return res.json();
+    }).then(function(record) {
+        document.getElementById('input').style.display = 'none';
+        playRecord(document.getElementById('canvas'), record, 0);
+    }).catch(error => alert(error));
+}
+// @license-end