关于javascript: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次要应用到 polyline 进行划线操作，以及应用 marker 去进行小车挪动操作。效果图如下：

​

具体实现代码：

trackplay.wxml 文件

<!--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="{{imageSrc}}"></cover-image>
    </cover-view>
    <!--cover-view class="trackerQuick" bindtap="trackerQuickPlay">
        <cover-image style="line-height:1;" src="{{imageSpeedAdd}}"></cover-image>
    </cover-view>
    <cover-view class="trackerSlow" bindtap="trackerSlowPlay">
        <cover-image src="{{imageSpeedSlow}}"></cover-image>
    </cover-view-->
    <cover-view class="trackerPause" bindtap="trackerPause">
        <cover-image src="{{imagePause}}"></cover-image>
    </cover-view>
    <cover-view class="trackerPlay" bindtap="trackerPlay">
        <cover-image src="{{imagePlay}}"></cover-image>
    </cover-view>
</map>

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地位
      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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113.873199, gpsBearing: 244},{latitude: 22.59605, longitude: 113.873199, gpsBearing: 244},{latitude: 22.596054, longitude: 113.873201, gpsBearing: 244},{latitude: 22.596061, longitude: 113.873211, gpsBearing: 244},{latitude: 22.596063, longitude: 113.873215, gpsBearing: 244},{latitude: 22.596064, longitude: 113.87322, gpsBearing: 244},{latitude: 22.59607, longitude: 113.873222, gpsBearing: 244},{latitude: 22.596067, longitude: 113.873219, gpsBearing: 244},{latitude: 22.596063, longitude: 113.873215, gpsBearing: 244},{latitude: 22.59606, longitude: 113.873219, gpsBearing: 244},{latitude: 22.596061, longitude: 113.873213, gpsBearing: 244},{latitude: 22.595382, longitude: 113.873102, gpsBearing: 0},{latitude: 22.595395, longitude: 113.873132, gpsBearing: 0},{latitude: 22.595371, longitude: 113.873124, gpsBearing: 0},{latitude: 22.595353, longitude: 113.873115, gpsBearing: 0},{latitude: 22.595278, longitude: 113.873133, gpsBearing: 0},{latitude: 22.595199, longitude: 113.873142, 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113.83051, gpsBearing: 11},{latitude: 22.671142, longitude: 113.830573, gpsBearing: 11},{latitude: 22.670879, longitude: 113.830429, gpsBearing: 348},{latitude: 22.670907, longitude: 113.830445, gpsBearing: 260},{latitude: 22.670978, longitude: 113.830479, gpsBearing: 224},{latitude: 22.671004, longitude: 113.830568, gpsBearing: 224},{latitude: 22.670994, longitude: 113.830727, gpsBearing: 153},{latitude: 22.670997, longitude: 113.830757, gpsBearing: 161},{latitude: 22.671047, longitude: 113.830795, gpsBearing: 166},{latitude: 22.671073, longitude: 113.830817, gpsBearing: 169},{latitude: 22.671085, longitude: 113.830824, gpsBearing: 169},{latitude: 22.671058, longitude: 113.830814, gpsBearing: 169},{latitude: 22.671086, longitude: 113.830899, gpsBearing: 169},{latitude: 22.671089, longitude: 113.830965, gpsBearing: 169},{latitude: 22.671117, longitude: 113.830947, gpsBearing: 169},{latitude: 22.671631, longitude: 113.831154, gpsBearing: 158},{latitude: 22.6716, longitude: 113.831148, 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: {               // 对立设置地图配置
      skew: 0,                  // 歪斜角度
      rotate: 0,                // 旋转角度
      showScale: false,         // 显示比例尺，工具暂不反对
      subKey: '',               // 个性化地图应用的 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,            // 展现 3D 楼块 ( 工具暂不反对）enableOverlooking: false,   // 仰视
      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("最初点:",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 () { // 完结回放
    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();},
})

这里如果每次挪动一个点，就切换一下地图中心点，去追随车辆地位的话，地图会有抖动的感觉。所以咱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。

这里还应用了 translateMarker 的函数来进行小车偏向角的切换，让小车能够平滑切换。要留神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性能的，后续咱们将持续增加快进和快退的性能。

实现过程中遇到几个小程序 bug，临时无奈解决，先记录下来，等微信更新：

1. 画轨迹线中 borderWidth 设置，导致轨迹真机无奈显示。

2. 地图层级切换导致的轨迹不可见。具体能够参照：https://developers.weixin.qq.com/community/develop/doc/000e8eed2fc20884237a791105b800

以上两个问题都没找到解决办法，有解决办法的能够给我发音讯通知我