详解微信小程序轨迹回放实现及遇到的坑

<!--pages/tracker/tracker.wxml-->
<map id="mymap" longitude="{{mapCenter.longitude}}" latitude="{{mapCenter.latitude}}" scale="{{scale}}" markers="{{markers}}" polyline="{{polylineSettings}}" include-points="polygons" setting="{{mapSettings}}" bindregionchange="updatedMap" max-scale="16">
  <cover-view>{{showMessage}}</cover-view>
  <cover-view class="trackerImage" bindtap="trackerSetting">
    <cover-image class="lazy" data-src="/UploadFiles/2021-04-02/{{imageSrc}}">

trackplay.js文件


const app = getApp();
Page({

 /**
  * 页面的初始数据
  */
 data: {
  mapCtx: null,
  scale: 14,
  imageSrc: '/images/tracker/tracker-search.png',
  imageSpeedAdd: '/images/tracker/speed-add.png',
  imageSpeedSlow: '/images/tracker/speed-slow.png',
  imagePause: '/images/tracker/pause.png',
  imagePlay: '/images/tracker/play.png',
  mapCenter: {
   longitude: 113.324520,
   latitude: 23.099994
  },
  markers: [{ //标记点用于在地图上显示标记的位置
   iconPath: "/images/tracker/car.png",
   id: 1,
   width: 25,
   height: 40,
   longitude: 113.324520,
   latitude: 23.099994,
   rotate: 0, //旋转角度 默认0
   anchor: {
    x: .5,
    y: .5
   }, //经纬度在标注图标的锚点，默认底边中点 {x: .5, y: 1}
   callout: { //标记点上方的气泡窗口
    content: '轨迹回放',
    color: '#fff',
    fontSize: 16,
    borderRadius: 3,
    borderWidth: 1,
    borderColor: '#07c160',
    bgColor: '#fff',
    padding: 5,
    textAlign: 'center',
    display: 'BYCLICK'
   },
  }],
  polylineSettings: [{ //路线
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180},{latitude: 22.671269, longitude: 113.830879, gpsBearing: 180},{latitude: 22.671215, longitude: 113.830906, gpsBearing: 180},{latitude: 22.6712, longitude: 113.830907, gpsBearing: 180},{latitude: 22.671278, longitude: 113.830979, gpsBearing: 180},{latitude: 22.671498, longitude: 113.831101, gpsBearing: 180},{latitude: 22.671705, longitude: 113.831304, gpsBearing: 43},{latitude: 22.671713, longitude: 113.831276, gpsBearing: 297},{latitude: 22.67165, longitude: 113.831221, gpsBearing: 298},{latitude: 22.671617, longitude: 113.83117, gpsBearing: 312},{latitude: 22.671463, longitude: 113.831156, gpsBearing: 326},{latitude: 22.671413, longitude: 113.831106, gpsBearing: 339},{latitude: 22.671225, longitude: 113.831049, gpsBearing: 353},{latitude: 22.670929, longitude: 113.830936, gpsBearing: 99},{latitude: 22.670841, longitude: 113.83088, gpsBearing: 225},{latitude: 22.671066, longitude: 113.830904, gpsBearing: 231},{latitude: 22.671164, longitude: 113.830972, gpsBearing: 20},{latitude: 22.671189, longitude: 113.83107, gpsBearing: 22},{latitude: 22.671145, longitude: 113.831111, gpsBearing: 29},{latitude: 22.671133, longitude: 113.830951, gpsBearing: 34},{latitude: 22.671185, longitude: 113.830818, gpsBearing: 29},{latitude: 22.671209, longitude: 113.830802, gpsBearing: 348},{latitude: 22.671145, longitude: 113.830834, gpsBearing: 348},{latitude: 22.67109, longitude: 113.830825, gpsBearing: 348},{latitude: 22.671034, longitude: 113.830765, gpsBearing: 348},{latitude: 22.671065, longitude: 113.830838, gpsBearing: 348},{latitude: 22.671175, longitude: 113.830935, gpsBearing: 348},{latitude: 22.671178, longitude: 113.830935, gpsBearing: 348},{latitude: 22.671248, longitude: 113.830893, gpsBearing: 348},{latitude: 22.671134, longitude: 113.83089, gpsBearing: 348},{latitude: 22.671147, longitude: 113.830964, gpsBearing: 348},{latitude: 22.671283, longitude: 113.831064, gpsBearing: 348},{latitude: 22.671341, longitude: 113.831058, gpsBearing: 348}],
   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 "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();
 },
})




这里如果每次移动一个点，就切换一下地图中心点，去跟随车辆位置的话，地图会有抖动的感觉。所以我们做了一个可视化区域的判断，当车出了可视化区域的时候再进行地图中心点的切换。
这里还使用了translateMarker的函数来进行小车偏向角的切换，让小车可以平滑切换。要注意小车图片默认的朝上是向上，相当于正北方向。
目前是实现了轨迹回放功能的，后续我们将继续添加快进和快退的功能。
实现过程中遇到几个小程序bug，暂时无法解决，先记录下来，等微信更新：
1.画轨迹线中borderWidth设置，导致轨迹真机无法显示。
2.地图层级切换导致的轨迹不可见。具体可以参照：https://developers.weixin.qq.com/community/develop/doc/000e8eed2fc20884237a791105b800
以上两个问题都没找到解决办法，有解决办法的可以给我发消息告诉我