server/aspnetapp/wwwroot/lib/alloyfinger/alloy_finger.js

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/* AlloyFinger v0.1.15
 * By dntzhang
 * Github: https://github.com/AlloyTeam/AlloyFinger
 */
; (function () {
    function getLen(v) {
        return Math.sqrt(v.x * v.x + v.y * v.y);
    }

    function dot(v1, v2) {
        return v1.x * v2.x + v1.y * v2.y;
    }

    function getAngle(v1, v2) {
        var mr = getLen(v1) * getLen(v2);
        if (mr === 0) return 0;
        var r = dot(v1, v2) / mr;
        if (r > 1) r = 1;
        return Math.acos(r);
    }

    function cross(v1, v2) {
        return v1.x * v2.y - v2.x * v1.y;
    }

    function getRotateAngle(v1, v2) {
        var angle = getAngle(v1, v2);
        if (cross(v1, v2) > 0) {
            angle *= -1;
        }

        return angle * 180 / Math.PI;
    }

    var HandlerAdmin = function(el) {
        this.handlers = [];
        this.el = el;
    };

    HandlerAdmin.prototype.add = function(handler) {
        this.handlers.push(handler);
    }

    HandlerAdmin.prototype.del = function(handler) {
        if(!handler) this.handlers = [];

        for(var i=this.handlers.length; i>=0; i--) {
            if(this.handlers[i] === handler) {
                this.handlers.splice(i, 1);
            }
        }
    }

    HandlerAdmin.prototype.dispatch = function() {
        for(var i=0,len=this.handlers.length; i<len; i++) {
            var handler = this.handlers[i];
            if(typeof handler === 'function') handler.apply(this.el, arguments);
        }
    }