本篇介绍一下使用vue3-openlayers点击多边形弹框，高亮多边形，自定义属性传递，鼠标悬浮多边形上动态修改鼠标样式

1 需求

• 加载天地图，polygon
• 传递自定义属性
• 标悬浮在polygon上，根据自定义属性，动态修改鼠标样式为pointer
• 点击polygon，根据自定义属性，高亮,弹框

2 分析

主要是 vue3-openlayers 中 地图事件，overlay等功能的使用

3 实现

<template><ol-map:loadTilesWhileAnimating="true":loadTilesWhileInteracting="true"style="width: 100%; height: 100%"ref="mapRef"@click="handleClick"@pointermove="handlePointerMove"><ol-viewref="view":center="center":rotation="rotation":zoom="zoom":projection="projection"/><ol-tile-layer><ol-source-tianditulayerType="img":projection="projection":tk="key":hidpi="true"ref="sourceRef"></ol-source-tianditu></ol-tile-layer><ol-tile-layer><ol-source-tianditu:isLabel="true"layerType="img":projection="projection":tk="key":hidpi="true"></ol-source-tianditu></ol-tile-layer><ol-vector-layer><ol-source-vector><ol-feature :properties="{ pointer: true }"><ol-geom-polygon:coordinates="[[[112, 31],[113, 32.2],[114, 30.5],[112, 31]]]"></ol-geom-polygon><ol-style><ol-style-fill color="rgba(228, 147, 87, 0.4)"></ol-style-fill><ol-style-stroke color="rgba(228, 147, 87, 1)" :width="3"></ol-style-stroke></ol-style></ol-feature><ol-feature ><ol-geom-polygon:coordinates="[[[114, 31],[115, 32.2],[115, 30.5],[114, 31]]]"></ol-geom-polygon><ol-style><ol-style-fill color="rgba(255, 128, 87, 0.4)"></ol-style-fill><ol-style-stroke color="rgba(255, 128, 87, 1)" :width="3"></ol-style-stroke></ol-style></ol-feature></ol-source-vector></ol-vector-layer><ol-overlay ref="overlayRef" :autoPan="true" :position="position" v-if="info"><div class="overlay-content">{{ info }}</div></ol-overlay></ol-map>
</template><script setup lang="ts">
import { Fill, Stroke, Style } from 'ol/style';
import { toStringHDMS } from 'ol/coordinate.js';
import {  toLonLat } from 'ol/proj';const center = ref([121, 31]);
const projection = ref('EPSG:4326');
const zoom = ref(5);
const rotation = ref(0);
const mapRef = ref();
const overlayRef = ref(null);
const key = '替换为天地图key';
const sourceRef = ref(null);
const feature = ref();
const info=ref();
const position=ref();
// layerType  img, vec, ter, cia, cta
//  'vec', 'cva'  矢量底图, 矢量注记
//  'img', 'cia'  影像底图, 影像注记
//  'ter', 'cta'  地形晕渲, 地形注记const style = new Style({fill: new Fill({color: 'rgba(228, 147, 87, 0.4)'}),stroke: new Stroke({color: 'rgba(228, 147, 87, 1)',width: 3})
});onMounted(() => {const source = sourceRef.value?.source;const overlay = overlayRef.value?.overlay;
});const handleClick = e => {//click事件也可以用mapRef在mounted中进行绑定 mapRef.value.map.on('click', (e: any) => {})，类似openlayers原生写法if (feature.value) {feature.value.setStyle(style);info.value='';}const features = mapRef.value.map.getFeaturesAtPixel(e.pixel);const f = features.find(f => f.getProperties().pointer);const highLight = style.clone();highLight.getFill()?.setColor('rgba(255, 255, 100, 0.4)');highLight.getStroke()?.setColor('rgba(255, 255, 100, 1)');if (f) {feature.value = f;f.setStyle(highLight);const coordinate = e.coordinate;const hdms = toStringHDMS(toLonLat(coordinate));info.value='当前经纬度:'+ hdms ;position.value=coordinate;}
};const handlePointerMove = e => {mapRef.value.map.getTargetElement().style.cursor = 'auto';const features = mapRef.value.map.getFeaturesAtPixel(e.pixel);features.forEach(feature => {const property = feature.getProperties();if (property.pointer) {mapRef.value.map.getTargetElement().style.cursor = 'pointer'; //设置鼠标样式} else {mapRef.value.map.getTargetElement().style.cursor = 'auto';}});
};
</script>
<style scoped lang="scss">
.overlay-content {background: rgba(255, 255, 255, 0.7);box-shadow: 0 5px 10px rgb(2 2 2 / 20%);padding: 10px 20px;font-size: 16px;color: black;
}</style>