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
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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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。
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