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，以及使用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

<!--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 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0anchor: {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: 244},{latitude: 22.595992, longitude: 113.87303, gpsBearing: 244},{latitude: 22.59602, longitude: 113.87305, gpsBearing: 244},{latitude: 22.596017, longitude: 113.873057, gpsBearing: 244},{latitude: 22.596017, longitude: 113.873056, gpsBearing: 244},{latitude: 22.596011, longitude: 113.87305, gpsBearing: 244},{latitude: 22.596008, longitude: 113.873049, gpsBearing: 244},{latitude: 22.596006, longitude: 113.87305, gpsBearing: 244},{latitude: 22.596004, longitude: 113.873053, gpsBearing: 244},{latitude: 22.596004, longitude: 113.873054, gpsBearing: 244},{latitude: 22.595989, longitude: 113.873044, gpsBearing: 244},{latitude: 22.595996, longitude: 113.873051, gpsBearing: 244},{latitude: 22.596023, longitude: 113.873084, gpsBearing: 244},{latitude: 22.596033, longitude: 113.873076, gpsBearing: 244},{latitude: 22.59604, longitude: 113.873076, gpsBearing: 244},{latitude: 22.596041, longitude: 113.873077, gpsBearing: 244},{latitude: 22.596035, longitude: 113.87308, gpsBearing: 244},{latitude: 22.596023, longitude: 113.873069, gpsBearing: 244},{latitude: 22.59602, longitude: 113.873076, gpsBearing: 244},{latitude: 22.596019, longitude: 113.873085, gpsBearing: 244},{latitude: 22.596027, longitude: 113.873101, gpsBearing: 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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: {               //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keylayerStyle: 1,            //个性化地图配置的 styleenableZoom: 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。

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

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