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Viewing file:     signature_pad.min.js (13.77 KB)      -rw-r--r--

! function (t, e) {
    "object" == typeof exports && "undefined" != typeof module ? module.exports = e() : "function" == typeof define && define.amd ? define(e) : t.SignaturePad = e()
}(this, function () {
    "use strict";

    function t(t, e, i) {
        this.x = t, this.y = e, this.time = i || (new Date).getTime()
    }

    function e(t, e, i, o) {
        this.startPoint = t, this.control1 = e, this.control2 = i, this.endPoint = o
    }

    function i(t, e, i) {
        var o, n, s, r = null,
            h = 0;
        i || (i = {});
        var a = function () {
            h = !1 === i.leading ? 0 : Date.now(), r = null, s = t.apply(o, n), r || (o = n = null)
        };
        return function () {
            var c = Date.now();
            h || !1 !== i.leading || (h = c);
            var d = e - (c - h);
            return o = this, n = arguments, d <= 0 || d > e ? (r && (clearTimeout(r), r = null), h = c, s = t.apply(o, n), r || (o = n = null)) : r || !1 === i.trailing || (r = setTimeout(a, d)), s
        }
    }

    function o(t, e) {
        var n = this,
            s = e || {};
        this.velocityFilterWeight = s.velocityFilterWeight || .7, this.minWidth = s.minWidth || .5, this.maxWidth = s.maxWidth || 2.5, this.throttle = "throttle" in s ? s.throttle : 16, this.minDistance = "minDistance" in s ? s.minDistance : 5, this.throttle ? this._strokeMoveUpdate = i(o.prototype._strokeUpdate, this.throttle) : this._strokeMoveUpdate = o.prototype._strokeUpdate, this.dotSize = s.dotSize || function () {
            return (this.minWidth + this.maxWidth) / 2
        }, this.penColor = s.penColor || "black", this.backgroundColor = s.backgroundColor || "rgba(0,0,0,0)", this.onBegin = s.onBegin, this.onEnd = s.onEnd, this._canvas = t, this._ctx = t.getContext("2d"), this.clear(), this._handleMouseDown = function (t) {
            1 === t.which && (n._mouseButtonDown = !0, n._strokeBegin(t))
        }, this._handleMouseMove = function (t) {
            n._mouseButtonDown && n._strokeMoveUpdate(t)
        }, this._handleMouseUp = function (t) {
            1 === t.which && n._mouseButtonDown && (n._mouseButtonDown = !1, n._strokeEnd(t))
        }, this._handleTouchStart = function (t) {
            if (1 === t.targetTouches.length) {
                var e = t.changedTouches[0];
                n._strokeBegin(e)
            }
        }, this._handleTouchMove = function (t) {
            t.preventDefault();
            var e = t.targetTouches[0];
            n._strokeMoveUpdate(e)
        }, this._handleTouchEnd = function (t) {
            t.target === n._canvas && (t.preventDefault(), n._strokeEnd(t))
        }, this.on()
    }
    return t.prototype.velocityFrom = function (t) {
        return this.time !== t.time ? this.distanceTo(t) / (this.time - t.time) : 1
    }, t.prototype.distanceTo = function (t) {
        return Math.sqrt(Math.pow(this.x - t.x, 2) + Math.pow(this.y - t.y, 2))
    }, t.prototype.equals = function (t) {
        return this.x === t.x && this.y === t.y && this.time === t.time
    }, e.prototype.length = function () {
        for (var t = 0, e = void 0, i = void 0, o = 0; o <= 10; o += 1) {
            var n = o / 10,
                s = this._point(n, this.startPoint.x, this.control1.x, this.control2.x, this.endPoint.x),
                r = this._point(n, this.startPoint.y, this.control1.y, this.control2.y, this.endPoint.y);
            if (o > 0) {
                var h = s - e,
                    a = r - i;
                t += Math.sqrt(h * h + a * a)
            }
            e = s, i = r
        }
        return t
    }, e.prototype._point = function (t, e, i, o, n) {
        return e * (1 - t) * (1 - t) * (1 - t) + 3 * i * (1 - t) * (1 - t) * t + 3 * o * (1 - t) * t * t + n * t * t * t
    }, o.prototype.clear = function () {
        var t = this._ctx,
            e = this._canvas;
        t.fillStyle = this.backgroundColor, t.clearRect(0, 0, e.width, e.height), t.fillRect(0, 0, e.width, e.height), this._data = [], this._reset(), this._isEmpty = !0
    }, o.prototype.fromDataURL = function (t) {
        var e = this,
            i = arguments.length > 1 && void 0 !== arguments[1] ? arguments[1] : {},
            o = new Image,
            n = i.ratio || window.devicePixelRatio || 1,
            s = i.width || this._canvas.width / n,
            r = i.height || this._canvas.height / n;
        this._reset(), o.src = t, o.onload = function () {
            e._ctx.drawImage(o, 0, 0, s, r)
        }, this._isEmpty = !1
    }, o.prototype.toDataURL = function (t) {
        var e;
        switch (t) {
            case "image/svg+xml":
                return this._toSVG();
            default:
                for (var i = arguments.length, o = Array(i > 1 ? i - 1 : 0), n = 1; n < i; n++) o[n - 1] = arguments[n];
                return (e = this._canvas).toDataURL.apply(e, [t].concat(o))
        }
    }, o.prototype.on = function () {
        this._handleMouseEvents(), this._handleTouchEvents()
    }, o.prototype.off = function () {
        this._canvas.removeEventListener("mousedown", this._handleMouseDown), this._canvas.removeEventListener("mousemove", this._handleMouseMove), document.removeEventListener("mouseup", this._handleMouseUp), this._canvas.removeEventListener("touchstart", this._handleTouchStart), this._canvas.removeEventListener("touchmove", this._handleTouchMove), this._canvas.removeEventListener("touchend", this._handleTouchEnd)
    }, o.prototype.isEmpty = function () {
        return this._isEmpty
    }, o.prototype._strokeBegin = function (t) {
        this._data.push([]), this._reset(), this._strokeUpdate(t), "function" == typeof this.onBegin && this.onBegin(t)
    }, o.prototype._strokeUpdate = function (t) {
        var e = t.clientX,
            i = t.clientY,
            o = this._createPoint(e, i),
            n = this._data[this._data.length - 1],
            s = n && n[n.length - 1],
            r = s && o.distanceTo(s) < this.minDistance;
        if (!s || !r) {
            var h = this._addPoint(o),
                a = h.curve,
                c = h.widths;
            a && c && this._drawCurve(a, c.start, c.end), this._data[this._data.length - 1].push({
                x: o.x,
                y: o.y,
                time: o.time,
                color: this.penColor
            })
        }
    }, o.prototype._strokeEnd = function (t) {
        var e = this.points.length > 2,
            i = this.points[0];
        if (!e && i && this._drawDot(i), i) {
            var o = this._data[this._data.length - 1],
                n = o[o.length - 1];
            i.equals(n) || o.push({
                x: i.x,
                y: i.y,
                time: i.time,
                color: this.penColor
            })
        }
        "function" == typeof this.onEnd && this.onEnd(t)
    }, o.prototype._handleMouseEvents = function () {
        this._mouseButtonDown = !1, this._canvas.addEventListener("mousedown", this._handleMouseDown), this._canvas.addEventListener("mousemove", this._handleMouseMove), document.addEventListener("mouseup", this._handleMouseUp)
    }, o.prototype._handleTouchEvents = function () {
        this._canvas.style.msTouchAction = "none", this._canvas.style.touchAction = "none", this._canvas.addEventListener("touchstart", this._handleTouchStart), this._canvas.addEventListener("touchmove", this._handleTouchMove), this._canvas.addEventListener("touchend", this._handleTouchEnd)
    }, o.prototype._reset = function () {
        this.points = [], this._lastVelocity = 0, this._lastWidth = (this.minWidth + this.maxWidth) / 2, this._ctx.fillStyle = this.penColor
    }, o.prototype._createPoint = function (e, i, o) {
        var n = this._canvas.getBoundingClientRect();
        return new t(e - n.left, i - n.top, o || (new Date).getTime())
    }, o.prototype._addPoint = function (t) {
        var i = this.points,
            o = void 0;
        if (i.push(t), i.length > 2) {
            3 === i.length && i.unshift(i[0]), o = this._calculateCurveControlPoints(i[0], i[1], i[2]);
            var n = o.c2;
            o = this._calculateCurveControlPoints(i[1], i[2], i[3]);
            var s = o.c1,
                r = new e(i[1], n, s, i[2]),
                h = this._calculateCurveWidths(r);
            return i.shift(), {
                curve: r,
                widths: h
            }
        }
        return {}
    }, o.prototype._calculateCurveControlPoints = function (e, i, o) {
        var n = e.x - i.x,
            s = e.y - i.y,
            r = i.x - o.x,
            h = i.y - o.y,
            a = {
                x: (e.x + i.x) / 2,
                y: (e.y + i.y) / 2
            },
            c = {
                x: (i.x + o.x) / 2,
                y: (i.y + o.y) / 2
            },
            d = Math.sqrt(n * n + s * s),
            l = Math.sqrt(r * r + h * h),
            u = a.x - c.x,
            v = a.y - c.y,
            p = l / (d + l),
            _ = {
                x: c.x + u * p,
                y: c.y + v * p
            },
            y = i.x - _.x,
            f = i.y - _.y;
        return {
            c1: new t(a.x + y, a.y + f),
            c2: new t(c.x + y, c.y + f)
        }
    }, o.prototype._calculateCurveWidths = function (t) {
        var e = t.startPoint,
            i = t.endPoint,
            o = {
                start: null,
                end: null
            },
            n = this.velocityFilterWeight * i.velocityFrom(e) + (1 - this.velocityFilterWeight) * this._lastVelocity,
            s = this._strokeWidth(n);
        return o.start = this._lastWidth, o.end = s, this._lastVelocity = n, this._lastWidth = s, o
    }, o.prototype._strokeWidth = function (t) {
        return Math.max(this.maxWidth / (t + 1), this.minWidth)
    }, o.prototype._drawPoint = function (t, e, i) {
        var o = this._ctx;
        o.moveTo(t, e), o.arc(t, e, i, 0, 2 * Math.PI, !1), this._isEmpty = !1
    }, o.prototype._drawCurve = function (t, e, i) {
        var o = this._ctx,
            n = i - e,
            s = Math.floor(t.length());
        o.beginPath();
        for (var r = 0; r < s; r += 1) {
            var h = r / s,
                a = h * h,
                c = a * h,
                d = 1 - h,
                l = d * d,
                u = l * d,
                v = u * t.startPoint.x;
            v += 3 * l * h * t.control1.x, v += 3 * d * a * t.control2.x, v += c * t.endPoint.x;
            var p = u * t.startPoint.y;
            p += 3 * l * h * t.control1.y, p += 3 * d * a * t.control2.y, p += c * t.endPoint.y;
            var _ = e + c * n;
            this._drawPoint(v, p, _)
        }
        o.closePath(), o.fill()
    }, o.prototype._drawDot = function (t) {
        var e = this._ctx,
            i = "function" == typeof this.dotSize ? this.dotSize() : this.dotSize;
        e.beginPath(), this._drawPoint(t.x, t.y, i), e.closePath(), e.fill()
    }, o.prototype._fromData = function (e, i, o) {
        for (var n = 0; n < e.length; n += 1) {
            var s = e[n];
            if (s.length > 1)
                for (var r = 0; r < s.length; r += 1) {
                    var h = s[r],
                        a = new t(h.x, h.y, h.time),
                        c = h.color;
                    if (0 === r) this.penColor = c, this._reset(), this._addPoint(a);
                    else if (r !== s.length - 1) {
                        var d = this._addPoint(a),
                            l = d.curve,
                            u = d.widths;
                        l && u && i(l, u, c)
                    }
                } else {
                    this._reset();
                    o(s[0])
                }
        }
    }, o.prototype._toSVG = function () {
        var t = this,
            e = this._data,
            i = this._canvas,
            o = Math.max(window.devicePixelRatio || 1, 1),
            n = i.width / o,
            s = i.height / o,
            r = document.createElementNS("http://www.w3.org/2000/svg", "svg");
        r.setAttributeNS(null, "width", i.width), r.setAttributeNS(null, "height", i.height), this._fromData(e, function (t, e, i) {
            var o = document.createElement("path");
            if (!(isNaN(t.control1.x) || isNaN(t.control1.y) || isNaN(t.control2.x) || isNaN(t.control2.y))) {
                var n = "M " + t.startPoint.x.toFixed(3) + "," + t.startPoint.y.toFixed(3) + " C " + t.control1.x.toFixed(3) + "," + t.control1.y.toFixed(3) + " " + t.control2.x.toFixed(3) + "," + t.control2.y.toFixed(3) + " " + t.endPoint.x.toFixed(3) + "," + t.endPoint.y.toFixed(3);
                o.setAttribute("d", n), o.setAttribute("stroke-width", (2.25 * e.end).toFixed(3)), o.setAttribute("stroke", i), o.setAttribute("fill", "none"), o.setAttribute("stroke-linecap", "round"), r.appendChild(o)
            }
        }, function (e) {
            var i = document.createElement("circle"),
                o = "function" == typeof t.dotSize ? t.dotSize() : t.dotSize;
            i.setAttribute("r", o), i.setAttribute("cx", e.x), i.setAttribute("cy", e.y), i.setAttribute("fill", e.color), r.appendChild(i)
        });
        var h = '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 ' + n + " " + s + '" width="' + n + '" height="' + s + '">',
            a = r.innerHTML;
        if (void 0 === a) {
            var c = document.createElement("dummy"),
                d = r.childNodes;
            c.innerHTML = "";
            for (var l = 0; l < d.length; l += 1) c.appendChild(d[l].cloneNode(!0));
            a = c.innerHTML
        }
        var u = h + a + "</svg>";
        return "data:image/svg+xml;base64," + btoa(u)
    }, o.prototype.fromData = function (t) {
        var e = this;
        this.clear(), this._fromData(t, function (t, i) {
            return e._drawCurve(t, i.start, i.end)
        }, function (t) {
            return e._drawDot(t)
        }), this._data = t
    }, o.prototype.toData = function () {
        return this._data
    }, o
});