微信小程序轨迹回放实现及遇到的坑

微信小程序轨迹回放实现

微信小程序轨迹回放主要使用到polyline进行划线操作，已经使用marker去进行小车移动操作。效果图如下：

具体实现代码：

trackplay.wxml文件

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
      points: [{latitude: 22.596206, longitude: 113.87317, gpsBearing: 244},{latitude: 22.596216, longitude: 113.873192, gpsBearing: 244},{latitude: 22.596213, longitude: 113.873177, gpsBearing: 244},{latitude: 22.596212, longitude: 113.873205, gpsBearing: 244},{latitude: 22.596155, longitude: 113.873147, gpsBearing: 244},{latitude: 22.59614, longitude: 113.87315, gpsBearing: 244},{latitude: 22.596122, longitude: 113.873146, gpsBearing: 244},{latitude: 22.596098, longitude: 113.873101, gpsBearing: 244},{latitude: 22.596123, longitude: 113.873095, gpsBearing: 244},{latitude: 22.59613, longitude: 113.873047, gpsBearing: 244},{latitude: 22.596154, longitude: 113.873006, gpsBearing: 244},{latitude: 22.596142, longitude: 113.873006, gpsBearing: 244},{latitude: 22.596131, longitude: 113.873009, gpsBearing: 244},{latitude: 22.596117, longitude: 113.873011, gpsBearing: 244},{latitude: 22.596112, longitude: 113.873014, gpsBearing: 244},{latitude: 22.596114, longitude: 113.873021, gpsBearing: 244},{latitude: 22.596122, longitude: 113.873029, gpsBearing: 244},{latitude: 22.596131, longitude: 113.873039, gpsBearing: 244},{latitude: 22.596127, longitude: 113.873046, gpsBearing: 244},{latitude: 22.596116, longitude: 113.873053, gpsBearing: 244},{latitude: 22.596097, longitude: 113.873055, gpsBearing: 244},{latitude: 22.596084, longitude: 113.87306, gpsBearing: 244},{latitude: 22.596074, longitude: 113.873069, gpsBearing: 244},{latitude: 22.596062, longitude: 113.873076, gpsBearing: 244},{latitude: 22.596046, longitude: 113.873075, gpsBearing: 244},{latitude: 22.596028, longitude: 113.873072, gpsBearing: 244},{latitude: 22.595997, longitude: 113.873047, gpsBearing: 244},{latitude: 22.595982, longitude: 113.873054, gpsBearing: 244},{latitude: 22.595967, longitude: 113.873067, gpsBearing: 244},{latitude: 22.595971, longitude: 113.873058, gpsBearing: 244},{latitude: 22.595975, longitude: 113.873046, gpsBearing: 244},{latitude: 22.595984, longitude: 113.873035, gpsBearing: 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gpsBearing: 145},{latitude: 22.67152, longitude: 113.831287, gpsBearing: 145},{latitude: 22.671486, longitude: 113.831509, gpsBearing: 77},{latitude: 22.67135, longitude: 113.831558, gpsBearing: 96},{latitude: 22.671349, longitude: 113.831529, gpsBearing: 102},{latitude: 22.671346, longitude: 113.831489, gpsBearing: 95},{latitude: 22.671388, longitude: 113.831372, gpsBearing: 95},{latitude: 22.671386, longitude: 113.831333, gpsBearing: 95},{latitude: 22.671407, longitude: 113.831286, gpsBearing: 95},{latitude: 22.671292, longitude: 113.831228, gpsBearing: 95},{latitude: 22.671025, longitude: 113.831196, gpsBearing: 149},{latitude: 22.671026, longitude: 113.831183, gpsBearing: 180},{latitude: 22.671076, longitude: 113.83113, gpsBearing: 180},{latitude: 22.671119, longitude: 113.831024, gpsBearing: 180},{latitude: 22.67117, longitude: 113.830974, gpsBearing: 180},{latitude: 22.67112, longitude: 113.830935, gpsBearing: 180},{latitude: 22.671233, longitude: 113.830912, gpsBearing: 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 ? 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();
  },
})

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。

 

实现过程中遇到几个问题，暂时无法解决：

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