openlayers [九] 地图覆盖物overlay三种常用用法 popup弹窗，marker标注，text文本

简介

常见的地图覆盖物为这三种类型，如：popup弹窗、label标注信息、text文本信息等。

overlay 实现popup弹窗

方法详解

1. 实例一个 new Overlay()，设置相关的属性，element 是和页面的 最外层弹窗的dom进行绑定
2. 通过 map.addOverlay(this.overlay) 把 overlay弹窗添加到页面
3. closer.onclick 添加一个 x 关闭弹窗事件
4. 通过 this.map.on(“singleclick”, function(evt) 事件点击地图触发弹窗效果

overlay 实现label 标注信息

// 创建一个标注信息
const addMarker = () => {
	var marker = new Overlay({
		position: fromLonLat([104.043505, 30.58165]),
		positioning: 'center-center',
		element: document.getElementById('marker'),
		stopEvent: false,
	});
	map.value.addOverlay(marker);
};

overlay实现 text 文本信息

// 创建文字标签 label
const addText = () => {
	var textInfo = new Overlay({
		position: fromLonLat([104.043505, 30.58165]),
		offset: [20, -20],
		element: document.getElementById('textInfo'),
	});
	map.value.addOverlay(textInfo);
};

完整代码

<!--
 * @Author: zhangchao zhang_chao96@163.com
 * @Date: 2023-07-05 15:20:38
 * @LastEditors: zhangchao zhang_chao96@163.com
 * @LastEditTime: 2023-07-06 15:46:16
 * @FilePath: \v3_test\src\views\index.vue
 * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
-->
<template>
	<div id="content">
		<div id="marker"></div>
		<div id="map"></div>
		<div id="textInfo">我是text文本信息</div>

		<div id="popup" class="ol-popup">
			<a href="#" id="popup-closer" class="ol-popup-closer"></a>
			<div id="popup-content" class="popup-content"></div>
		</div>
	</div>
</template>
<script setup>
import { ref, onMounted } from 'vue';
import 'ol/ol.css';
import { Map, View } from 'ol';
import { defaults as defaultControls } from 'ol/control';
import Tile from 'ol/layer/Tile';
import { fromLonLat, transform, toLonLat } from 'ol/proj';
import OSM from 'ol/source/OSM';
import Overlay from 'ol/Overlay';
import { toStringHDMS } from 'ol/coordinate';
const map = ref();
const initMap = () => {
	let titleLayer = [
		new Tile({
			source: new OSM(),
		}),
	];
	let view = new View({
		center: fromLonLat([104.912777, 34.730746]), //地图中心坐标
		zoom: 4.5,
	});
	map.value = new Map({
		target: 'map',
		layers: titleLayer,
		view: view,
	});
};
// 创建一个标注信息
const addMarker = () => {
	var marker = new Overlay({
		position: fromLonLat([104.043505, 30.58165]),
		positioning: 'center-center',
		element: document.getElementById('marker'),
		stopEvent: false,
	});
	map.value.addOverlay(marker);
};
// 创建文字标签 label
const addText = () => {
	var textInfo = new Overlay({
		position: fromLonLat([104.043505, 30.58165]),
		offset: [20, -20],
		element: document.getElementById('textInfo'),
	});
	map.value.addOverlay(textInfo);
};
// 弹框
const overlay = ref();
const addPopup = () => {
	// 使用变量存储弹窗所需的 DOM 对象
	var container = document.getElementById('popup');
	var closer = document.getElementById('popup-closer');
	var content = document.getElementById('popup-content');
	overlay.value = new Overlay({
		element: container, //绑定 Overlay 对象和 DOM 对象的
		autoPan: false, // 定义弹出窗口在边缘点击时候可能不完整 设置自动平移效果
		autoPanAnimation: {
			duration: 250, //自动平移效果的动画时间 9毫秒）
		},
	});
	map.value.addOverlay(overlay.value);
	closer.onclick = function () {
		overlay.value.setPosition(undefined);
		closer.blur();
		return false;
	};
	map.value.on('singleclick', function (evt) {
		let coordinate = transform(evt.coordinate, 'EPSG:3857', 'EPSG:4326');
		// 点击尺 （这里是尺(米)，并不是经纬度）;
		let hdms = toStringHDMS(toLonLat(evt.coordinate)); // 转换为经纬度显示
		content.innerHTML = `
                <p>你点击了这里：</p>
                <p>经纬度：<p><code> ${hdms}  </code> <p>
                <p>坐标：</p>X：${coordinate[0]} &nbsp;&nbsp; Y: ${coordinate[1]}`;
		overlay.value.setPosition(evt.coordinate); //把 overlay 显示到指定的 x,y坐标
	});
};
onMounted(() => {
	initMap();
	addMarker();
	addText();
	addPopup();
});
</script>
<style lang="scss" scoped>
#content,
#map {
	height: 100%;
}
#marker {
	width: 20px;
	height: 20px;
	background: red;
	border-radius: 50%;
}
#textInfo {
	width: 200px;
	height: 40px;
	line-height: 40px;
	background: burlywood;
	color: yellow;
	text-align: center;
	font-size: 20px;
}

.ol-popup {
	position: absolute;
	background-color: white;
	-webkit-filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
	filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
	padding: 15px;
	border-radius: 10px;
	border: 1px solid #cccccc;
	bottom: 12px;
	left: -50px;
}
.ol-popup:after,
.ol-popup:before {
	top: 100%;
	border: solid transparent;
	content: ' ';
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
}
.ol-popup:after {
	border-top-color: white;
	border-width: 10px;
	left: 48px;
	margin-left: -10px;
}
.ol-popup:before {
	border-top-color: #cccccc;
	border-width: 11px;
	left: 48px;
	margin-left: -11px;
}
.ol-popup-closer {
	text-decoration: none;
	position: absolute;
	top: 2px;
	right: 8px;
}
.popup-content {
	width: 400px;
}
.ol-popup-closer:after {
	content: '?';
}
</style>