• 【咸鱼教程】Egret实现摇一摇功能


    教程目录
    一 实现原理
    二 代码
    三 Demo下载


    一 实现原理
    监听设备旋转角度的变化,来判断用户是否摇动手机。

    参考:
    智能手机里陀螺仪和重力感应有何区别?
    HTML5实现摇一摇的功能
    Egret官方陀螺仪教程


    二 代码
    摇一摇工具类ShakeTool使用范例

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    private shakeTest(){
            this.shakeTool = new ShakeTool();
            this.shakeTool.addEventListener(egret.Event.CHANGE, this.onChange,this);
            this.shakeTool.start();
    }
     
    private onChange(e:egret.Event){
           var data = e.data;
           //用户大概晃动了手机2-3次
           if(data.shakeCount > 6){
                    egret.log("摇一摇完成");
                     this.shakeTool.stop();
            }
    }




    ShakeTool源码

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    /**
     * 摇一摇工具类
     * @author chenkai
     * [url=home.php?mod=space&uid=81950]@since[/url] 2017/4/20
     */
    class ShakeTool extends egret.EventDispatcher{
            private orientation:egret.DeviceOrientation; //设备方向变化
            private xAngle: number = 0;     //设备绕x角度
            private yAngle: number = 0;     //设备绕y角度
            private zAngle: number = 0;     //设备绕z角度
            private last_x: number = 0;     //上一次绕x角度
            private last_y: number = 0;     //上一次绕y角度
            private last_z: number = 0;     //上一次绕z角度
            private shakeCount: number = 0; //摇动次数
            private lastTime:number = 0;    //上一次更新时间
            private shakeAngle:number = 45; //当晃动角度大于一定角度时,算摇动一次
     
            public constructor(){
                    super();
            }
     
            /**开始 */
            public start(){
                    //重置数据
                    this.shakeCount = 0;
                    this.lastTime = 0;
                    this.last_x = 0;
                    this.last_y = 0;
                    this.last_z = 0;
     
                    //开始监听
                    this.orientation || (this.orientation = new egret.DeviceOrientation());
                    this.orientation.addEventListener(egret.Event.CHANGE,this.onOrientation,this);
                    this.orientation.start();
            }
     
            /**停止 */
            public stop(){
                    if(this.orientation){
                            this.orientation.removeEventListener(egret.Event.CHANGE,this.onOrientation,this);
                            this.orientation.stop();
                    }
            }
     
            private onOrientation(e: egret.OrientationEvent) {
                    var curTime:number = egret.getTimer();
     
                    //每100ms判断一次
                    if(curTime - this.lastTime > 100){
                            this.lastTime = curTime;
     
                            this.xAngle = e.beta;   //x轴
                            this.yAngle = e.gamma;  //y轴
                            this.zAngle = e.alpha ; //z轴
     
                            //旋转超过一定角度,则算摇动一次
                            if(Math.abs(this.last_x - this.xAngle)>this.shakeAngle ||
                                    Math.abs(this.last_y - this.yAngle)>this.shakeAngle ||
                                    Math.abs(this.last_z - this.zAngle)>this.shakeAngle){
                                            this.shakeCount ++;
                            }
                            this.last_x = this.xAngle;
                            this.last_y = this.yAngle;
                            this.last_z = this.zAngle;
                    }
     
                    //派发事件(应该在shakeCount++时派发一次,写在这里只是为了方便显示测试数据...)
                    this.dispatchEventWith(egret.Event.CHANGE,false, {x:this.xAngle,y:this.yAngle,z:this.zAngle,shakeCount:this.shakeCount});
            }
    }



    Demo下载

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  • 原文地址:https://www.cnblogs.com/gamedaybyday/p/9219939.html
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