ribbon-dynamic.js

"object" == typeof window && (window.Ribbons = function () {
    var t = window,
        i = document.body,
        n = document.documentElement,
        o = function () {
            if (1 === arguments.length) {
                if (Array.isArray(arguments[0])) {
                    var t = Math.round(o(0, arguments[0].length - 1));
                    return arguments[0][t]
                }
                return o(0, arguments[0])
            }
            return 2 === arguments.length ? Math.random() * (arguments[1] - arguments[0]) + arguments[0] : 0
        },
        s = function (o) {
            var s = Math.max(0, t.innerWidth || n.clientWidth || i.clientWidth || 0),
                h = Math.max(0, t.innerHeight || n.clientHeight || i.clientHeight || 0),
                e = Math.max(0, t.pageXOffset || n.scrollLeft || i.scrollLeft || 0) - (n.clientLeft || 0),
                a = Math.max(0, t.pageYOffset || n.scrollTop || i.scrollTop || 0) - (n.clientTop || 0);
            return {
                width: s,
                height: h,
                ratio: s / h,
                centerx: s / 2,
                centery: h / 2,
                scrollx: e,
                scrolly: a
            }
        },
        h = function (t, i) {
            this.x = 0, this.y = 0, this.set(t, i)
        };
    h.prototype = {
        constructor: h,
        set: function (t, i) {
            this.x = t || 0, this.y = i || 0
        },
        copy: function (t) {
            return this.x = t.x || 0, this.y = t.y || 0, this
        },
        multiply: function (t, i) {
            return this.x *= t || 1, this.y *= i || 1, this
        },
        divide: function (t, i) {
            return this.x /= t || 1, this.y /= i || 1, this
        },
        add: function (t, i) {
            return this.x += t || 0, this.y += i || 0, this
        },
        subtract: function (t, i) {
            return this.x -= t || 0, this.y -= i || 0, this
        },
        clampX: function (t, i) {
            return this.x = Math.max(t, Math.min(this.x, i)), this
        },
        clampY: function (t, i) {
            return this.y = Math.max(t, Math.min(this.y, i)), this
        },
        flipX: function () {
            return this.x *= -1, this
        },
        flipY: function () {
            return this.y *= -1, this
        }
    };
    var e = function (t) {
        this._canvas = null, this._context = null, this._sto = null, this._width = 0, this._height = 0, this._scroll = 0, this._ribbons = [], this._options = {
            colorSaturation: "80%",
            colorBrightness: "60%",
            colorAlpha: .65,
            colorCycleSpeed: 6,
            verticalPosition: "center",
            horizontalSpeed: 150,
            ribbonCount: 5,
            strokeSize: 5,
            parallaxAmount: -.5,
            animateSections: !0
        }, this._onDraw = this._onDraw.bind(this), this._onResize = this._onResize.bind(this), this._onScroll = this._onScroll.bind(this), this.setOptions(t), this.init()
    };
    return e.prototype = {
        constructor: e,
        setOptions: function (t) {
            if ("object" == typeof t)
                for (var i in t) t.hasOwnProperty(i) && (this._options[i] = t[i])
        },
        init: function () {
            try {
                this._canvas = document.createElement("canvas"), this._canvas.style.display = "block", this._canvas.style.position = "fixed", this._canvas.style.margin = "0", this._canvas.style.padding = "0", this._canvas.style.border = "0", this._canvas.style.outline = "0", this._canvas.style.left = "0", this._canvas.style.top = "0", this._canvas.style.width = "100%", this._canvas.style.height = "100%", this._canvas.style["z-index"] = "-1", this._onResize(), this._context = this._canvas.getContext("2d"), this._context.clearRect(0, 0, this._width, this._height), this._context.globalAlpha = this._options.colorAlpha, window.addEventListener("resize", this._onResize), window.addEventListener("scroll", this._onScroll), document.body.appendChild(this._canvas)
            } catch (t) {
                return void console.warn("Canvas Context Error: " + t.toString())
            }
            this._onDraw()
        },
        addRibbon: function () {
            var t = Math.round(o(1, 9)) > 5 ? "right" : "left",
                i = 1e3,
                n = this._width + 200,
                s = 0,
                e = 0,
                a = "right" === t ? -200 : n,
                r = Math.round(o(0, this._height));
            /^(top|min)$/i.test(this._options.verticalPosition) ? r = 200 : /^(middle|center)$/i.test(this._options.verticalPosition) ? r = this._height / 2 : /^(bottom|max)$/i.test(this._options.verticalPosition) && (r = this._height - 200);
            for (var l = [], c = new h(a, r), p = new h(a, r), _ = null, d = Math.round(o(0, 360)), u = 0; !(i <= 0);) {
                if (i--, s = Math.round((1 * Math.random() - .2) * this._options.horizontalSpeed), e = Math.round((1 * Math.random() - .5) * (.25 * this._height)), (_ = new h).copy(p), "right" === t) {
                    if (_.add(s, e), p.x >= n) break
                } else if ("left" === t && (_.subtract(s, e), p.x <= -200)) break;
                l.push({
                    point1: new h(c.x, c.y),
                    point2: new h(p.x, p.y),
                    point3: _,
                    color: d,
                    delay: u,
                    dir: t,
                    alpha: 0,
                    phase: 0
                }), c.copy(p), p.copy(_), u += 4, d += this._options.colorCycleSpeed
            }
            this._ribbons.push(l)
        },
        _drawRibbonSection: function (t) {
            if (t) {
                if (t.phase >= 1 && t.alpha <= 0) return !0;
                if (t.delay <= 0) {
                    if (t.phase += .02, t.alpha = 1 * Math.sin(t.phase), t.alpha = t.alpha <= 0 ? 0 : t.alpha, t.alpha = t.alpha >= 1 ? 1 : t.alpha, this._options.animateSections) {
                        var i = .1 * Math.sin(1 + t.phase * Math.PI / 2);
                        "right" === t.dir ? (t.point1.add(i, 0), t.point2.add(i, 0), t.point3.add(i, 0)) : (t.point1.subtract(i, 0), t.point2.subtract(i, 0), t.point3.subtract(i, 0)), t.point1.add(0, i), t.point2.add(0, i), t.point3.add(0, i)
                    }
                } else t.delay -= .5;
                var n = this._options.colorSaturation,
                    o = this._options.colorBrightness,
                    s = "hsla(" + t.color + ", " + n + ", " + o + ", " + t.alpha + " )";
                this._context.save(), 0 !== this._options.parallaxAmount && this._context.translate(0, this._scroll * this._options.parallaxAmount), this._context.beginPath(), this._context.moveTo(t.point1.x, t.point1.y), this._context.lineTo(t.point2.x, t.point2.y), this._context.lineTo(t.point3.x, t.point3.y), this._context.fillStyle = s, this._context.fill(), this._options.strokeSize > 0 && (this._context.lineWidth = this._options.strokeSize, this._context.strokeStyle = s, this._context.lineCap = "round", this._context.stroke()), this._context.restore()
            }
            return !1
        },
        _onDraw: function () {
            for (var t = 0, i = this._ribbons.length; t < i; ++t) this._ribbons[t] || this._ribbons.splice(t, 1);
            this._context.clearRect(0, 0, this._width, this._height);
            for (var n = 0; n < this._ribbons.length; ++n) {
                for (var o = this._ribbons[n], s = o.length, h = 0, e = 0; e < s; ++e) this._drawRibbonSection(o[e]) && h++;
                h >= s && (this._ribbons[n] = null)
            }
            this._ribbons.length < this._options.ribbonCount && this.addRibbon(), requestAnimationFrame(this._onDraw)
        },
        _onResize: function (t) {
            var i = s();
            this._width = i.width, this._height = i.height, this._canvas && (this._canvas.width = this._width, this._canvas.height = this._height, this._context && (this._context.globalAlpha = this._options.colorAlpha))
        },
        _onScroll: function (t) {
            var i = s();
            this._scroll = i.scrolly
        }
    }, e
}()), new Ribbons({
    colorSaturation: "60%",
    colorBrightness: "50%",
    colorAlpha: .5,
    colorCycleSpeed: 5,
    verticalPosition: "random",
    horizontalSpeed: 200,
    ribbonCount: 3,
    strokeSize: 0,
    parallaxAmount: -.2,
    animateSections: !0
});