Openlayers3实现车辆轨迹回放功能

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记录基于geoserver地图服务，Openlayers3在web前端实现车辆轨迹回放功能，并记录和解决过程中出现的linestring只描绘部分经纬度坐标问题。

参考Openlayers3 官网例子

html

<!DOCTYPE html>
<html lang="en">
<head>
 <title>车辆轨迹回放</title>
 <meta charset="UTF-8"/>
 <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
 <link rel="stylesheet" href="../css/bootstrap.min.css"/>
 <link rel="stylesheet" href="../ol/ol.css"/>
 <style>
 #map {
 position: relative;
 }
 .popover{
 min-width: 60px;
 }
 html{height:100%}
 body{height:100%;margin:0px;padding:0px}
 </style>
</head>
<body style="margin: 0px 0px 0px 0px;line-height:0px;">
<div id="content">
 <!--<div id="map" style="height: 100%;width:100%"></div>-->
 <div class="row-fluid">
 <div>
 <div id="map" class="map"></div>
 </div>
 </div>

 <div class="row-fluid">
 <div class="span3" style="position:absolute;top:0px;right:0px;">
 <div class="accordion-group widget-box">
 <div class="accordion-heading">
  <div class="widget-title"><a data-parent="#collapse-group" href="#collapseGOne"
    data-toggle="collapse"><span class="icon"><i
  class="icon-map-marker"></i></span>
  <h5>轨迹查询</h5>
  </a>
  </div>
 </div>
 <div class="accordion-body in collapse" id="collapseGOne">
  <div class="form-actions">
  <div class="control-group" style="margin-bottom: 0px">
  <label class="control-label"><i class="icon-truck"></i>设备</label>

  <div class="controls">
  <select id="busSelect" class="span10">
   <option value="*">请选择设备</option>
  </select>
  </div>
  </div>
  </div>


  <div class="form-actions">
  <div class="control-group" style="margin-bottom: 0px">
  <label class="control-label"><i class="icon-table"></i>日期</label>

  <div class="controls">
  <div data-date="" class="input-append date datepicker">
   <input id="traceday" type="text" data-date-format="yyyy-mm-dd" class="span10"
   disabled>
   <span class="add-on"><i class="icon-time"></i></span></div>
  </div>
  </div>
  </div>
  <div style="padding: 19px 20px 20px; margin-top: 20px; margin-bottom: 20px;">
  <div class="control-group" style="margin-bottom: 0px">
  <button id="queryBtn" class="btn btn-primary"><i class="icon-search"></i>&nbsp;轨迹查询</button> 
  <span class="remind"></span>
 </div>
  <div class="control-group" style="margin-top: 10px">
  <button id="animateBtn" class="btn btn-info"><i class="icon-eye-open"></i>&nbsp;轨迹回放</button> 
  <input id="speed" type="range" min="1" max="100" step="10" value="10">&nbsp;<span><i class="icon-cog">速度</i></span>
 </div>
 </div>
 </div>
 </div>
</div>
</div>
</div>
</div>
<script src="/UploadFiles/2021-04-02/jquery.min.js">

map初始化


$(document).ready(function () {
 map = new ol.Map({
 logo: false,
 target: document.getElementById('map'),
 layers: layers,
 view: view
 });
 initSelect();//设备下拉框列表初始化
 //时间控件初始化
 $('#s-traceday').val(transfromTime(new Date(),false)+" 00:00:00");
 $('#e-traceday').val(transfromTime(new Date(),true));
 $('.datepicker').datetimepicker({
 minView:0,
 format: 'yyyy-MM-dd hh:mm:ss', 
 todayBtn : "linked", 
 autoclose : true, 
 todayHighlight : true,
 startDate: daylimit,
 endDate:'+1d'//结束时间，在这时间之后都不可选
 });
});

//轨迹line layer
var vsource = new ol.source.Vector({
 type: 'LineString',
 features: []
});
var linelayers = new ol.layer.Vector({
 source: vsource,
 style: new ol.style.Style({
 fill: new ol.style.Fill({
 color: '#0044CC'
 }),
 stroke: new ol.style.Stroke({
 color: '#0044CC',
 width: 4
 })
 })
});
//地图基础参数
var map;
var center = [121.6606763113213, 31.14611063632111];
var lng, lat;
var source = new ol.source.Vector({
 wrapX: false
});;
var projection = new ol.proj.Projection({
 code: 'EPSG:4326',
 units: 'degrees',
 axisOrientation: 'neu'
});
var view = new ol.View({
 projection: projection,
 center: center,
 zoom: 16
});

var layers = [new ol.layer.Tile({
 title: '、地图',
 visible: true,
 preload: Infinity,
 source: new ol.source.TileWMS({
 url: gisUrl,
 params: {
 'VERSION': '1.1.0',
 tiled: true,
 STYLES: '',
 LAYERS: 'shanghai:maptest',
 }
 })
 }),linelayers];


ajax获取坐标数据


//轨迹查询按钮点击
var positions=[];
$("#queryBtn").click(function(){
 //清除之前的图层
 if (centerSource.getFeatures != null) {
 centerSource.clear(); }
 linelayers.getSource().clear(true);
 positions=[];//清空
 //取值
 var busnum=$("#busSelect").val();
 var traceday=$("#traceday").val();
 if(busnum=="*"){
 $(".remind").html('<i class="icon-info-sign">请先选择车辆</i>');
 return;
 }else{
 $(".remind").html('');
 busnum=busnum.slice(2);
 }
 if(transfromTime(new Date(),false)==traceday){//当天
 traceday="*";
 }else{
 traceday=traceday.replace(/(-)/g,"");
 }
 $(".remind").html('<i class="icon-cogs"> 正在查询...</i>');

 //请求
 $.getJSON(baseUrl+"trace/query/"+busnum+"/"+traceday,"",function(data){
 if(data.length==0){
 $(".remind").html('<i class="icon-info-sign">未查到gps数据</i>');return;
 }
 var position = [];
 for(var i = 0;i<data.length;i++){
 if(i!=0&&data[i].lon==data[i-1].lon&&data[i].lon==data[i-1].lon){//去除重复数据
  continue;
 }
 position = [parseFloat(data[i].lon),parseFloat(data[i].lat)];
 positions.push(position);
 }
 console.log(positions);
 if(positions.length==1){
 $(".remind").html('<i class="icon-info-sign">该车辆当天停在该位置未启动</i>');
 centerAt(positions[0]);
 return;
 }
 AddLayer(positions);
 });
});


显示轨迹


//轨迹描绘
function AddLayer() {
 var lineFeature = new ol.Feature({//路线
 geometry: new ol.geom.LineString(positions,'XY'),
 });
 linelayers.getSource().addFeature(lineFeature);

 var startFeature = new ol.Feature({//起点
 geometry: new ol.geom.Point(positions[0]),
 population: 4000,
 rainfall: 500
 });
 startFeature.setStyle(startStyle);
 linelayers.getSource().addFeature(startFeature);
 var endFeature = new ol.Feature({//终点
 geometry: new ol.geom.Point(positions[positions.length-1]),
 population: 4000,
 rainfall: 500
 });
 endFeature.setStyle(endStyle);
 linelayers.getSource().addFeature(endFeature);


 carFeature = new ol.Feature({//车子
 geometry: new ol.geom.Point(positions[0]),
 population: 4000,
 rainfall: 500
 });
 carFeature.setStyle(carStyle);
 linelayers.getSource().addFeature(carFeature);
 var extent = linelayers.getSource().getExtent();//合适比例缩放居中
 view.fit(extent, map.getSize());
 }


显示单点


//居中 车辆不运动时居中显示图标处理
var centerLayer = null;
var centerSource = new ol.source.Vector({
 features: null
});
//居中在一个位置
function centerAt(position) {
 var pan = ol.animation.pan({
 duration: 2000,
 source: (view.getCenter())
 });
 view.setCenter(position);

 var iconFeature = new ol.Feature({
 geometry: new ol.geom.Point(position),
 name: 'Null Island',
 population: 4000,
 rainfall: 500
 });
 iconFeature.setStyle(iconStyle);
 centerSource.addFeature(iconFeature);
 centerLayer = new ol.layer.Vector({
 source: centerSource
 });
 map.addLayer(centerLayer);
 centerLayer.setVisible(true);
}


点在线上运动，轨迹回放


//轨迹回放start 参考官网
var carFeature = null;
var speed, now;
var animating = false;
$("#animateBtn").click(function(){
 if(positions.length==0){
 $(".remind").html('<i class="icon-info-sign">请先查询轨迹</i>');
 return;
 }
 if (animating) {
 stopAnimation(false);
 } else {
 animating = true;
 now = new Date().getTime();
 speed = $("#speed").val();//速度
 $("#animateBtn").html('<i class="icon-eye-close"></i>&nbsp;取消回放');
 carFeature.setStyle(null);
 // map.getView().setCenter(center);
 map.on('postcompose', moveFeature);
 map.render();
 }
});

var moveFeature = function(event) {
 var vectorContext = event.vectorContext;
 var frameState = event.frameState;

 if (animating) {
 var elapsedTime = frameState.time - now;
 // here the trick to increase speed is to jump some indexes
 // on lineString coordinates
 var index = Math.round(speed * elapsedTime / 1000);

 if (index >= positions.length) {
 stopAnimation(true);
 return;
 }

 var currentPoint = new ol.geom.Point(positions[index]);
 var feature = new ol.Feature(currentPoint);
 vectorContext.drawFeature(feature, carStyle);
 }
 // tell OL3 to continue the postcompose animation
 map.render();
 };

 function startAnimation() {
 if (animating) {
 stopAnimation(false);
 } else {
 animating = true;
 now = new Date().getTime();
 speed = speedInput.value;
 $("#animateBtn").html('<i class="icon-eye-close"></i>&nbsp;取消回放');
 // hide geoMarker
 geoMarker.setStyle(null);
 // just in case you pan somewhere else
 map.getView().setCenter(center);
 map.on('postcompose', moveFeature);
 map.render();
 }
 }

 function stopAnimation(ended) {
 animating = false;
 $("#animateBtn").html('<i class="icon-eye-open"></i>&nbsp;轨迹回放');

 // if animation cancelled set the marker at the beginning
 var coord = ended "htmlcode">

var lineFeature = new ol.Feature({//路线
 geometry: new ol.geom.LineString(positions,'XY'),
 });
 linelayers.getSource().addFeature(lineFeature);


调用这段代码显示轨迹时，从数据库取到20个坐标，就可能只显示4个坐标，本来是弯曲的轨迹，但是实际上就是折线，很尴尬。

误打误撞，和同学 交流过程中发现问题所在，特此感谢。

在ajax获取坐标数据中发现问题所在：

原先错误代码


position = [data[i].lon,data[i].lat];
 positions.push(position);


正确代码


position = [parseFloat(data[i].lon),parseFloat(data[i].lat)];
 positions.push(position);


原因就是没有把float类型的坐标利用parseFloat强转，导致默认的泛数据类型精确度不够，经纬度小数点后末尾几位就会被忽略，于是造成数据失效，描出的线就会有问题。
附上icon、起点、终点、车辆等地图样式




//样式，供上述代码调用
var iconStyle = new ol.style.Style({
 image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
 anchor: [0.5, 0.8],
 anchorXUnits: 'fraction',
 anchorYUnits: 'pixels',
 opacity: 0.75,
 src: 'img/iconfont-weizhi-red.png'
 }))
});
var startStyle = new ol.style.Style({
 image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
 anchor: [0.5, 0.8],
 opacity: 0.8,
 src: 'img/start.png'
 /*anchorXUnits: 'fraction',
 anchorYUnits: 'pixels',
 opacity: 0.75,*/

 }))
});
var endStyle = new ol.style.Style({
 image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
 src: 'img/end.png',
 anchor: [0.5, 0.8],
 }))
});
var carStyle = new ol.style.Style({
 image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
 src: 'img/car.png',
 anchor: [0.5, 0.8],
 }))
});


以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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