Openlayers3 軌跡回放,點在線上運動, 解決linestring座標顯示不全
阿新 • • 發佈:2019-01-30
記錄基於geoserver地圖服務,Openlayers3在web前端實現車輛軌跡回放功能,並記錄和解決過程中出現的linestring只描繪部分經緯度座標問題。
參考Openlayers3 官網例子
html
<!DOCTYPE html>
<html lang="en">
<head>
<title>車輛軌跡回放</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>軌跡查詢</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>裝置</label>
<div class="controls">
<select id="busSelect" class="span10">
<option value="*">請選擇裝置</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> 軌跡查詢</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> 軌跡回放</button>
<input id="speed" type="range" min="1" max="100" step="10" value="10"> <span><i class="icon-cog">速度</i></span>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<script src="../js/lib/jquery.min.js"></script>
<script src="../js/lib/bootstrap.min.js"></script>
<script src="../ol/ol-debug.js"></script>
<script src="../ol/ol.js"></script>
<script src="../js/globalVariable.js"></script>
<script src="../js/gpsQueryAndroid.js"></script>
</body>
</html>
map初始化
$(document).ready(function () {
map = new ol.Map({
logo: false,
target: document.getElementById('map'),
layers: layers,
view: view
});
initSelect();//裝置下拉框列表初始化
//時間控制元件初始化
$('#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'//結束時間,在這時間之後都不可選
});
});
//軌跡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
})
})
});
//地圖基礎引數
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: '、地圖',
visible: true,
preload: Infinity,
source: new ol.source.TileWMS({
url: gisUrl,
params: {
'VERSION': '1.1.0',
tiled: true,
STYLES: '',
LAYERS: 'shanghai:maptest',
}
})
}),linelayers];
ajax獲取座標資料
//軌跡查詢按鈕點選
var positions=[];
$("#queryBtn").click(function(){
//清除之前的圖層
if (centerSource.getFeatures != null) {
centerSource.clear(); }
linelayers.getSource().clear(true);
positions=[];//清空
//取值
var busnum=$("#busSelect").val();
var traceday=$("#traceday").val();
if(busnum=="*"){
$(".remind").html('<i class="icon-info-sign">請先選擇車輛</i>');
return;
}else{
$(".remind").html('');
busnum=busnum.slice(2);
}
if(transfromTime(new Date(),false)==traceday){//當天
traceday="*";
}else{
traceday=traceday.replace(/(-)/g,"");
}
$(".remind").html('<i class="icon-cogs"> 正在查詢...</i>');
//請求
$.getJSON(baseUrl+"trace/query/"+busnum+"/"+traceday,"",function(data){
if(data.length==0){
$(".remind").html('<i class="icon-info-sign">未查到gps資料</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){//去除重複資料
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">該車輛當天停在該位置未啟動</i>');
centerAt(positions[0]);
return;
}
AddLayer(positions);
});
});
顯示軌跡
//軌跡描繪
function AddLayer() {
var lineFeature = new ol.Feature({//路線
geometry: new ol.geom.LineString(positions,'XY'),
});
linelayers.getSource().addFeature(lineFeature);
var startFeature = new ol.Feature({//起點
geometry: new ol.geom.Point(positions[0]),
population: 4000,
rainfall: 500
});
startFeature.setStyle(startStyle);
linelayers.getSource().addFeature(startFeature);
var endFeature = new ol.Feature({//終點
geometry: new ol.geom.Point(positions[positions.length-1]),
population: 4000,
rainfall: 500
});
endFeature.setStyle(endStyle);
linelayers.getSource().addFeature(endFeature);
carFeature = new ol.Feature({//車子
geometry: new ol.geom.Point(positions[0]),
population: 4000,
rainfall: 500
});
carFeature.setStyle(carStyle);
linelayers.getSource().addFeature(carFeature);
var extent = linelayers.getSource().getExtent();//合適比例縮放居中
view.fit(extent, map.getSize());
}
顯示單點
//居中 車輛不運動時居中顯示圖示處理
var centerLayer = null;
var centerSource = new ol.source.Vector({
features: null
});
//居中在一個位置
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);
}
點在線上運動,軌跡回放
//軌跡回放start 參考官網
var carFeature = null;
var speed, now;
var animating = false;
$("#animateBtn").click(function(){
if(positions.length==0){
$(".remind").html('<i class="icon-info-sign">請先查詢軌跡</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> 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> 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> 軌跡回放');
// if animation cancelled set the marker at the beginning
var coord = ended ? positions[positions.length - 1] : positions[0];
/** @type {ol.geom.Point} */ (carFeature.getGeometry())
.setCoordinates(coord);
//remove listener
map.un('postcompose', moveFeature);
}
//軌跡回放end
解決linestring座標顯示不全
期間碰到一個問題,
var lineFeature = new ol.Feature({//路線
geometry: new ol.geom.LineString(positions,'XY'),
});
linelayers.getSource().addFeature(lineFeature);
呼叫這段程式碼顯示軌跡時,從資料庫取到20個座標,就可能只顯示4個座標,本來是彎曲的軌跡,但是實際上就是折線,很尷尬。
誤打誤撞,和同學 交流過程中發現問題所在,特此感謝。
在ajax獲取座標資料中發現問題所在:
原先錯誤程式碼
position = [data[i].lon,data[i].lat];
positions.push(position);
正確程式碼
position = [parseFloat(data[i].lon),parseFloat(data[i].lat)];
positions.push(position);
原因就是沒有把float型別的座標利用parseFloat強轉,導致預設的泛資料型別精確度不夠,經緯度小數點後末尾幾位就會被忽略,於是造成資料失效,描出的線就會有問題。
附上icon、起點、終點、車輛等地圖樣式
//樣式,供上述程式碼呼叫
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],
}))
});