设置图标位置

原创已于 2023-01-19 18:54:40 修改 · 547 阅读

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于 2019-12-25 17:58:54 首次发布

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本文介绍如何在OpenLayers地图应用中实现图标随地图层级变化自动调整大小，通过监听地图分辨率变化事件，动态设置图标缩放比例，确保图标在不同层级下保持清晰可见。

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>设置图标位置</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css"
          integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
    <link rel="stylesheet"
          href="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.1.1/css/ol.css"
          type="text/css">
    <script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.1.1/build/ol.js"></script>
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js"
            integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa"
            crossorigin="anonymous"></script>

    <style>
        .map {
            width: 100%;
            height: 400px;
        }
    </style>
</head>
<body>
<div id="map" class="map"></div>
<script type="text/javascript">
    var layer = new ol.layer.Vector({
        source: new ol.source.Vector()
    })
    var map = new ol.Map({
        layers: [
            new ol.layer.Tile({
                source: new ol.source.OSM()
            }),
            layer
        ],
        target: 'map',
        view: new ol.View({
            projection: 'EPSG:4326',
            center: [106.62, 26.62],
            zoom: 10
        })
    });

    //为地图设置一个图标
   var anchor = new ol.Feature({
        geometry: new ol.geom.Point([106.62, 26.62])
    });
    anchor.setStyle(new ol.style.Style({
        image: new ol.style.Icon({
            src: 'anchor.jpg'
        })
    }));
    layer.getSource().addFeature(anchor);

    // 监听地图层级变化
    map.getView().on('change:resolution', function(){
        var style = anchor.getStyle();
        // 重新设置图标的缩放率，基于层级10来做缩放
        style.getImage().setScale(this.getZoom() / 10);
        anchor.setStyle(style);
    })
</script>
</body>
</html>