MxWeiXinPF.Web/obj/Release/Package/PackageTmp/weixin/albums/js/shake.js

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/*
 *
 * Find more about this plugin by visiting
 * http://alxgbsn.co.uk/
 *
 * Copyright (c) 2010-2012 Alex Gibson
 * Released under MIT license
 *
 */

(function (window, document) {

    function Shake() {

        //feature detect
        this.hasDeviceMotion = 'ondevicemotion' in window;

        //default velocity threshold for shake to register
        this.threshold = 15;

        //use date to prevent multiple shakes firing
        this.lastTime = new Date();

        //accelerometer values
        this.lastX = null;
        this.lastY = null;
        this.lastZ = null;

        //create custom event
        if (typeof CustomEvent === "function") {
            this.event = new CustomEvent('shake', {
                bubbles: true,
                cancelable: true
            });
        } else if (typeof document.createEvent === "function") {
            this.event = document.createEvent('Event');
            this.event.initEvent('shake', true, true);
        } else { 
          return false;
        }
    }

    //reset timer values
    Shake.prototype.reset = function () {
        this.lastTime = new Date();
        this.lastX = null;
        this.lastY = null;
        this.lastZ = null;
    };

    //start listening for devicemotion
    Shake.prototype.start = function () {
        this.reset();
        if (this.hasDeviceMotion) { window.addEventListener('devicemotion', this, false); }
    };

    //stop listening for devicemotion
    Shake.prototype.stop = function () {

        if (this.hasDeviceMotion) { window.removeEventListener('devicemotion', this, false); }