openlayers 框选（画图）得到在选款内的要素，并标注出这些要素的名称 Demo (可直接运行)
作者：互联网
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" />
<script type="text/javascript" src="https://openlayers.org/en/v5.3.0/build/ol.js"></script>
<title>Document</title>
</head>
<body>
<div id="map"></div>
<div id="selectedFeatures"></div>
<script>
var beijing = ol.proj.fromLonLat([116.28, 39.54]);
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
})
],
view: new ol.View({
center: beijing,
zoom: 4
})
});
//实例化矢量点要素，通过矢量图层添加到地图容器中
//这样就实现了预先加载图文标注
var iconFeature = new ol.Feature({
geometry: new ol.geom.Point(beijing),
name: '北京市', //名称属性
population: 2115 //人口数（万）
});
//设置点要素样式
iconFeature.setStyle(createLabelStyle(iconFeature));
//矢量标注的数据源
var vectorSource = new ol.source.Vector({
features: [iconFeature]
});
//矢量标注图层
var vectorLayer = new ol.layer.Vector({
source: vectorSource
});
map.addLayer(vectorLayer);
//矢量标注样式设置函数，设置image为图标ol.style.Icon
function createLabelStyle(feature){
// console.log(feature);
return new ol.style.Style({
image: new ol.style.Icon({
anchor: [0.5, 60], //锚点
anchorOrigin:'top-right', //锚点源
anchorXUnits: 'fraction', //锚点X值单位
anchorYUnits: 'pixels', //锚点Y值单位
offsetOrigin: 'top-right', //偏移原点
opacity: 0.75,
scale: 0.05,
src: 'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1594359193211&di=1d6bb819a5daa724ff65cc4d011d4d42&imgtype=0&src=http%3A%2F%2Fku.90sjimg.com%2Felement_pic%2F17%2F10%2F27%2F05dc60e54e3aa5d093cdc32611303643.jpg' //图标的URL
}),
text: new ol.style.Text({
textAlign: 'center', //位置
textBaseline: 'bottom', //基准线
font: 'normal 12px 微软雅黑', //文字样式
text: feature.get('name'), //文本内容
fill: new ol.style.Fill({ //文本填充样式（即文字颜色)
color: '#000'
}),
stroke: new ol.style.Stroke({
color: '#F00',
width: 2
})
})
});
}
var coordinate1 = [10806361.310845079, 3942927.667062532]; //鼠标单击点的坐标
var coordinate2 = [11540156.782382771, 4539747.983913189] //鼠标单击点的坐标
var coordinate3 = [12225032.55581795, 3982063.4255445423] //鼠标单击点的坐标
var arr =[coordinate1,coordinate2,coordinate3]
//新建一个要素ol.Feature
arr.forEach((ar,index) => {
var newFeature = new ol.Feature({
geometry: new ol.geom.Point(ar), //几何信息
name: '标注点'+index
});
newFeature.setStyle(createLabelStyle(newFeature)); //设置要素样式
vectorSource.addFeature(newFeature);
});
var draw = new ol.interaction.Draw({
source: vectorLayer.getSource(),
type:"Circle",
style:new ol.style.Style({
// 将点设置成圆形样式
image: new ol.style.Circle({
// 点的颜色
fill: new ol.style.Fill({
color: '#F00'
}),
// 圆形半径
radius: 5
}),
// 线样式
stroke: new ol.style.Stroke({
color: '#0F0',
lineCap: 'round', // 设置线的两端为圆头
width: 5
})
}),
geometryFunction: ol.interaction.Draw.createBox() // 使画出来的现状为矩形
});
map.addInteraction(draw);
draw.on('drawend',function(evt){
var polygon = evt.feature.getGeometry();
setTimeout(function(){ //如果不设置延迟，范围内要素选中后自动取消选中，具体原因不知道
var extent = polygon.getExtent()
var features = vectorLayer.getSource().getFeaturesInExtent(extent); //先缩小feature的范围
var str = "";
for(var i=0;i<features.length;i++){
var newCoords = features[i].getGeometry().getCoordinates();
if (features[i].get("name")) {
str += "<div class=\"selectedItem\" οnclick='showDeviceOnMap(\""+features[i].getId()+"\");'>"+features[i].get("name")+"</div>";
}
}
document.getElementById('selectedFeatures').innerHTML = str
},300)
})
</script>
</body>
</html>
标签：要素,style,ol,选款,Demo,feature,source,var,new 来源： https://www.cnblogs.com/wwj007/p/14029494.html