/*! fly - v1.0.0 - 2014-12-22
* https://github.com/amibug/fly
* Copyright (c) 2014 wuyuedong; Licensed MIT */
!
function(a) {
    a.fly = function(b, c) {
        var d = {
            version: "1.0.0",
            autoPlay: !0,
            vertex_Rtop: 20,
            speed: 1.2,
            start: {},
            end: {},
            onEnd: a.noop
        },
        e = this,
        f = a(b);
        e.init = function(a) {
            this.setOptions(a),
            !!this.settings.autoPlay && this.play()
        },
        e.setOptions = function(b) {
            this.settings = a.extend(!0, {},
            d, b);
            var c = this.settings,
            e = c.start,
            g = c.end;
            f.css({
                marginTop: "0px",
                marginLeft: "0px",
                position: "fixed"
            }).appendTo("body"),
            null != g.width && null != g.height && a.extend(!0, e, {
                width: f.width(),
                height: f.height()
            });
            var h = Math.min(e.top, g.top) - Math.abs(e.left - g.left) / 3;
            h < c.vertex_Rtop && (h = Math.min(c.vertex_Rtop, Math.min(e.top, g.top)));
            var i = Math.sqrt(Math.pow(e.top - g.top, 2) + Math.pow(e.left - g.left, 2)),
            j = Math.ceil(Math.min(Math.max(Math.log(i) / .05 - 75, 30), 100) / c.speed),
            k = e.top == h ? 0 : -Math.sqrt((g.top - h) / (e.top - h)),
            l = (k * e.left - g.left) / (k - 1),
            m = g.left == l ? 0 : (g.top - h) / Math.pow(g.left - l, 2);
            a.extend(!0, c, {
                count: -1,
                steps: j,
                vertex_left: l,
                vertex_top: h,
                curvature: m
            })
        },
        e.play = function() {
            this.move()
        },
        e.move = function() {
            var b = this.settings,
            c = b.start,
            d = b.count,
            e = b.steps,
            g = b.end,
            h = c.left + (g.left - c.left) * d / e,
            i = 0 == b.curvature ? c.top + (g.top - c.top) * d / e: b.curvature * Math.pow(h - b.vertex_left, 2) + b.vertex_top;
            if (null != g.width && null != g.height) {
                var j = e / 2,
                k = g.width - (g.width - c.width) * Math.cos(j > d ? 0 : (d - j) / (e - j) * Math.PI / 2),
                l = g.height - (g.height - c.height) * Math.cos(j > d ? 0 : (d - j) / (e - j) * Math.PI / 2);
                f.css({
                    width: k + "px",
                    height: l + "px",
                    "font-size": Math.min(k, l) + "px"
                })
            }
            f.css({
                left: h + "px",
                top: i + "px"
            }),
            b.count++;
            var m = window.requestAnimationFrame(a.proxy(this.move, this));
            d == e && (window.cancelAnimationFrame(m), b.onEnd.apply(this))
        },
        e.destory = function() {
            f.remove()
        },
        e.init(c)
    },
    a.fn.fly = function(b) {
        return this.each(function() {
            void 0 == a(this).data("fly") && a(this).data("fly", new a.fly(this, b))
        })
    }
} (jQuery);