Updated factor_min.js

function n() {
    function a(a, c) {
        return "undefined" !== typeof a ? a : c
    }
    this.d = function () {
        return (new Date).getTime()
    };
    this.getTime = function () {
        var a = this.d() - this.e,
            a = this.b + this.speed(a),
            a = Math.min(a, this.g);
        return a = Math.max(a, this.h)
    };
    this.a = function (a) {
        this.b = this.getTime();
        this.e = this.d();
        this.speed = "function" === typeof a ? a : function (c) {
            return c * a
        }
    };
    this.c = function () {
        return (this.speed(1E3) - this.speed(0)) / 1E3
    };
    this.f = function () {
        var a = this.speed;
        this.a(function (c) {
            return 4 * a(c)
        })
    };
    this.stop = function () {
        this.a(0)
    };
    this.i = function (a) {
        this.b += a
    };
    this.h = a(0, 0);
    this.g = a(9999500, 1E100);
    this.b = a(0, 0);
    this.e = this.d();
    this.speed = function (a) {
        return a
    };
    this.a(a(0, 1))
};
window.requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame || window.oRequestAnimationFrame;
window.requestAnimationFrame || (window.requestAnimationFrame = function (a) {
    var b = 0,
        c = Math.max(0, 16 - b);
    return window.setTimeout(function () {
        var c = (new Date).getTime();
        a(c);
        b = (new Date).getTime() - c
    }, c)
});
var p, t, u, v, x, y, z;
var lastPointX = 0;
var lastPointY = 0;
var first = 1;

function A(a, b, c) {
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    i.setAttribute("width", 30);
    i.setAttribute("height", 30);
    d.appendChild(i);
    d.onclick = function () {
        B();
        document.getElementById(a).className = "on";
        b()
    };
    d.onmouseover = function () {
        this.style.border = "solid 1px rgba(0,0,0,0.1)"
    };
    d.onmouseout = function () {
        this.style.border = ""
    };
    c(i);
    return d
}
function B() {
    for (var a = document.getElementById("controls").childNodes, b = 0; b < a.length; b++) a[b].className = "off"
}

function F(a, b, c, d) {
    var d = b + 0.85 * c * d,
        i = 0.5 - c / 2,
        c = 0.5 + c / 2,
        h = a.getContext("2d");
    h.save();
    h.scale(a.width, a.height);
    h.beginPath();
    h.moveTo(b, i);
    h.lineTo(d, 0.5);
    h.lineTo(b, c);
    h.closePath();
    h.lineJoin = "round";
    h.fillStyle = "#fff";
    h.fill();
    h.lineWidth = 1 / a.width;
    h.strokeStyle = "rgba(0,0,0,0.2)";
    h.stroke();
    h.restore()
}
function G(a) {
    F(a, 0.44, 0.4, - 1);
    F(a, 0.8, 0.4, - 1)
}
function H(a) {
    F(a, 0.56, 0.4, 1);
    F(a, 0.2, 0.4, 1)
}
function I(a) {
    F(a, 0.7, 0.6, - 1)
}
function J(a) {
    F(a, 0.3, 0.6, 1)
}

function K(a) {
    var b = a.getContext("2d");
    b.save();
    b.scale(a.width, a.height);
    b.beginPath();
    b.rect(0.25, 0.25, 0.5, 0.5);
    b.lineJoin = "round";
    b.fillStyle = "#fff";
    b.fill();
    b.lineWidth = 1 / a.width;
    b.strokeStyle = "rgba(0,0,0,0.2)";
    b.stroke();
    b.restore()
}
function L(a, b) {
    var c = a * v,
        d = b * v;
    return Math.acos(Math.cos(c) * Math.cos(d) + Math.sin(c) * Math.sin(d)) / v
}

function M(a, b, c, d, i, h, q, r, k) {
    if (i >= d.length) a.push(h), b.push(q), c.push(r);
    else {
        var e = d[i],
            m = i + 1 < d.length ? d[i + 1] : 0,
            l = 0.4 * r * v / (e + 3.4);
        m && (l *= 0.93, 2 === m && (l *= 1.2), 3 === m && 7 >= e && (l *= 1.12), 4 === m && 7 >= e && (l *= 1.08));
        var r = r - l,
            j;
        j = k + (4 === e ? -t : -u);
        for (var s = v / e, f = 0; f < e; f++) {
            var g = j + f * s;
            M(a, b, c, d, i + 1, h + r * Math.cos(g), q + r * Math.sin(g), l, 2 === m ? g - u : k)
        }
    }
}
function N(a) {
    if (1 >= a) return [];
    var b = O(a),
        a = N(a / b);
    a.push(b);
    return a
}

function O(a) {
    if (0 === a % 4) return 4;
    if (0 === a % 2) return 2;
    for (var b = Math.sqrt(a) + 1 | 0, c = 3; c <= b; c += 2) if (0 === a % c) return c;
    return a
}
function P(a, b) {
    var c;
    if (1 > b.length) c = "";
    else if (1 >= b.length && 4 !== b[0]) c = "prime";
    else {
        c = "";
        for (var d = 0; d < b.length; d++) {
            "" !== c && (c += '<span class="times">&times;</span>');
            var i = b[d];
            c = 4 == i ? c + '2<span class="times">&times;</span>2' : c + i
        }
    }
    return '<span class="number">' + a + '</span><br><span class="decomposition">' + c + "</span>"
}
function Q() {
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        c = a = 0,
        d = 0;
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        b = window.innerWidth
    } catch (i) {}
    try {
        a = window.innerHeight
    } catch (h) {}
    try {
        c = screen.availWidth
    } catch (q) {}
    try {
        d = screen.availHeight
    } catch (r) {}
    d && (d -= 70);
    b = b ? b : c;
    a = a ? a : d;
    b || (b = 974);
    a || (a = 718);
    a = Math.min(b, a);
    a = Math.max(a, 350);
    var k = Math.round(0.45 * (a - 90)),
        k = Math.max(k, 50),
        k = Math.min(k, 600),
        e = 2 * k + 1;
    if (e != canvas.width || e != canvas.height) canvas.width = e, canvas.height = e, a = Math.round(-e / 2) + "px", canvas.style.marginLeft = a, canvas.style.marginTop = a;
    var m = e / 2,
        l = e / 2;
    a = y.getTime() + 700;
    var j;
    j = Math.max(a / 1E3 | 0, 1);
    var s = j + 1,
        f = a - 500 - 1E3 * j,
        f = 3 * (f / 1E3),
        f = Math.max(f, 0),
        f = Math.min(f, 1),
        f = 0.5 - 0.5 * Math.cos(f * x),
        g = N(j);
    a = [];
    d = [];
    b = [];
    M(a, d, b, g, 0, m, l, k * (1 - 0.6 / (j + 1)), 0);
    var w = N(s),
        c = [],
        C = [],
        D = [];
    M(c, C, D, w, 0, m, l, k * (1 - 0.6 / (s + 1)), 0);
    k = document.getElementById("status1");
    m = document.getElementById("status2");
    k.innerHTML = P(j, g);
    m.innerHTML = P(s, w);
    j = 0.7 / (1 - f + f * f);
    k.style.opacity = 0.001 > j * (1 - f) ? 0.001 : 0.999 < j * (1 - f) ? 0.999 : j * (1 - f);
    m.style.opacity = 0.001 > j * f ? 0.001 : 0.999 < j * f ? 0.999 : j * f;

    //p.clearRect(0, 0, e, e);

    e = f;
    j = a.length;
    g = c.length;
    s = 1 / j;
    f = 1 / g;
    k = 1 - e;
    for (g -= 1; 0 <= g; g--) {
    if(g==0){
        var E;
        g < j ? (w = k * b[g] + e * D[g], m = k * g * s + e * g * f, l = k * a[g] + e * c[g], E = k * d[g] + e * C[g]) : (w = e * D[g], m = g * f, l = k * a[j - 1] + e * c[g], E = k * d[j - 1] + e * C[g]);
        p.fillStyle = z[m * z.length | 0];
        p.strokeStyle = p.fillStyle;
        if(first==1){
            first=0;
        }
        else{
            p.beginPath();
            p.moveTo(lastPointX,lastPointY);
            p.lineTo(l,E);
            p.closePath();
            p.stroke();
        }
            lastPointX = l;
            lastPointY = E;
        }
    }
    window.requestAnimationFrame(Q)
}
window.start = function () {
    canvas = document.getElementById("canvas");
    if (!canvas.getContext || !canvas.getContext("2d")) {
        var a = document.getElementById("frame"),
            b = document.createElement("div");
        b.setAttribute("id", "error");
        b.innerHTML = 'To view this visualization, upgrade to a modern web browser like <a href="http://www.google.com/chrome/">Chrome</a>.';
        a.appendChild(b)
    } else {
        p = canvas.getContext("2d");
        t = Math.PI / 4;
        u = Math.PI / 2;
        v = 2 * Math.PI;
        x = Math.PI;
        y = new n;
        for (var a = 1E3, b = [], c = 0, a = 1E3; c < a; c++) {
            var d = c / a + 0.9,
                i = 766.5 * Math.max(1 / 3 - L(1 / 6, d), 0),
                h = 766.5 * Math.max(1 / 3 - L(0.5, d), 0),
                d = 766.5 * Math.max(1 / 3 - L(5 / 6, d), 0),
                q = Math.sqrt(4E4 / (2 * i * i + 3 * h * h + d * d)),
                i = Math.round(i * q),
                h = Math.round(h * q),
                d = Math.round(d * q);
            b[c] = "rgb(" + i + "," + h + "," + d + ")"
        }
        z = b;
        A("fast_backward", function () {
            -2 < y.c() ? y.a(-4) : -100 < y.c() && y.f()
        }, G);
        A("play_backward", function () {
            y.a(-1)
        }, I);
        A("stop", function () {
            y.a(0)
        }, K);
        a = A("play_forward", function () {
            y.a(1)
        }, J);
        A("fast_forward", function () {
            2 > y.c() ? y.a(4) : 100 > y.c() && y.f()
        }, H);
        B();
        a.onclick();
        window.requestAnimationFrame(Q)
    }
};