微信小程序如何实现轨迹回放

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   color: "#7b7af8",
   width: 5,
   //borderWidth: 2,
   borderColor: '#7b7af8',
   level: 'abovebuildings',   //压盖关系
   arrowLine: true        //带箭头的线
  }],
  polygons: [],
  mapSettings: {        //统一设置地图配置
   skew: 0,         //倾斜角度
   rotate: 0,        //旋转角度
   showScale: false,     //显示比例尺，工具暂不支持
   subKey: '',        //个性化地图使用的key
   layerStyle: 1,      //个性化地图配置的 style
   enableZoom: true,     //缩放
   enableScroll: true,    //拖动
   enableRotate: false,   //旋转
   showCompass: false,     //指南针
   enable3D: false,      //展示3D楼块(工具暂不支持）
   enableOverlooking: false,  //俯视
   enableSatellite: false,   //卫星图
   enableTraffic: false,    //实时路况
  },
  playIndex: 0,
  showMessage: "",
  step: 1,
  duration: 100,
  maxDuration: 2000,
  minDuration: 500,
  isPause: false
 },
 trackPlay: function () { //轨迹接口
  const that = this;
  const points = this.data.polylineSettings[0].points;
  that.setData({
   'markers[0].latitude': points[0].latitude,
   'markers[0].longitude': points[0].longitude,
   mapCenter: points[0],
  }, function () {
   that.mapCtx.translateMarker({
    markerId: 1,
    autoRotate: true,
    moveWithRotate: true,
    duration: 1000,
    destination: points[0]
   })
   that.beginTrack() //轨迹回放
  })
 },
 beginTrack: function () { //轨迹回放
  const that = this;
  let index = that.data.playIndex === 0 ? 0 : that.data.playIndex;
  let points = this.data.polylineSettings[0].points;
  let duration = that.data.duration;

  //this.play();
  that.data.trackTimer = setInterval(function () {
   const point = points[index];
   that.data.lastPoint = point;
   //console.log("最后点:",that.data.lastPoint);
   // console.log(point,that.getCurrentTime());
   that.mapCtx.translateMarker({
    markerId: 1,
    autoRotate: false,
    moveWithRotate: true,
    duration: duration,
    destination: point,
    rotate: point.gpsBearing,
    fail: function (res) {
     console.log(res);
    },
    success: function () {
     that.setData({
      playIndex: index,
      showMessage: point.latitude + "," + point.longitude + "," + point.gpsBearing + "," + points.length + "," + index
     })
     that.mapCtx.getRegion({
      success: function (e) {
       if (that.checkOutRegion(point, e.southwest, e.northeast)) {
        that.setData({
         mapCenter: point,
        })
       }
      }
     });
     if (index + 1 >= points.length) {
      that.stopTrack()
     }
     index++;
    }
   })

  }, duration);
 },
 stopTrack: function () { //结束回放
  const that = this;
  let points = this.data.polylineSettings[0].points;
  that.setData({
   playIndex: 0,
   'markers[0].latitude': points[0].latitude,
   'markers[0].longitude': points[0].longitude,
  });
  clearInterval(that.data.trackTimer);
 },
 checkOutRegion: function (point, southwest, northeast) {
  // console.log(point,southwest,northeast);
  if (point.longitude < southwest.longitude || point.latitude < southwest.latitude) {
   return true;
  }
  if (point.longitude > northeast.longitude || point.latitude > northeast.latitude) {
   return true;
  }
  return false;
 },
 trackerPause: function () {
  if (!this.data.isPause) {
   clearInterval(this.data.trackTimer);
   this.setData({
    isPause: true
   });
  }

 },
 trackerPlay: function () {
  if (this.data.isPause) {
   this.beginTrack();
   this.setData({
    isPause: false
   });
  }

 },
 /**
  * 生命周期函数--监听页面加载
  */
 onLoad: function (options) {
  this.mapCtx = wx.createMapContext('mymap');
  this.trackPlay();
 },
})