ol-地图上添加图标

桃扇骨 2022-11-29 12:22 204阅读 0赞

先总结：用到的核心知识

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xoanVlamlhbmc_size_16_color_FFFFFF_t_70][]

添加图标，首先要创建一个图层，然后把图层添加到地图上

vecSource = new ol.source.Vector({
    
        features: []
    
    });
    
    vecLayer = new ol.layer.Vector({
    
        renderMode: 'image',
    
        source: vecSource,
    
        style: function(feat) {
    
            return styleFunction(feat, map);
    
        },
    
        zIndex: 10
    
    });
    
    map.addLayer(vecLayer);

styleFunction对图标进行一些样式处理

获取数据后，拿到经纬度，然后在地图上添加这些图标点，可以给点添加一些feature，方便后续操作图标的时候获取当前图标的信息。feature就是styleFunction函数中拿到的feat

function addWarnMapFeatures() {
    
        let features = [];
    
        let coords = [];
    
        for (let i = 0; i < shipList.length; i++) {
    
            const r = shipList[i];
    
            shipList[i].flag = 'LS';
    
            let lonlat = [r.lon, r.lat];
    
            let coord = ol.proj.transform(lonlat, 'EPSG:4326', 'EPSG:3857');
    
            features.push(
    
                new ol.Feature({
    
                    geometry: new ol.geom.Point(coord),
    
                    rotation: r.sog,
    
                    mmsi: r.mmsi,
    
                    name: r.name,
    
                    shipInfo: r
    
                })
    
            );
    
            coords.push(coord);
    
        }
    
        vecSource.addFeatures(features);

// 目的是定位到船舶所在的位置

if (coords.length > 0) {
    
            const pts = new ol.geom.MultiPoint(coords);
    
            // 获取几何体的范围 pts.getExtent()
    
            map.getView().fit(pts.getExtent());
    
            // map.getView().setZoom(11);
    
        }
    
    }

下面这两行代码是定位到当前经纬度集合的位置附近

const pts = new ol.geom.MultiPoint(coords);
    
            // 获取几何体的范围 pts.getExtent()
    
    map.getView().fit(pts.getExtent());

清除图层

vecSource.clear()

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xoanVlamlhbmc_size_16_color_FFFFFF_t_70]: /images/20221124/251af889faa6470c86dad69377f94c5a.png