Leaflet中使用Leaflet.MagnifyingGlass实现放大镜效果

柔光的暖阳◎ 2023-10-01 12:41 1阅读 0赞

## 场景 ##

Leaflet快速入门与加载OSM显示地图：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/122290880 ][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_122290880]

在上面的基础上，怎样使用插件实现放大镜效果如下

![dc113814b75442d589e5b588de498bcb.gif][]

注：

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## 实现 ##

1、插件地址

[GitHub - bbecquet/Leaflet.MagnifyingGlass: A plugin to add a customizable magnifying glass tool to a Leaflet map.][GitHub - bbecquet_Leaflet.MagnifyingGlass_ A plugin to add a customizable magnifying glass tool to a Leaflet map.]

2、下载源码，引入所需要的leaflet.magnifyingglass.js文件，将css文件直接写在html中，完整html代码

<!doctype html>
    <html lang="en">
    
    <head>
        <meta charset="UTF-8">
        <title>leaflet实现放大镜效果</title>
        <link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css" />
        <style>
            html,
            body,
            #map {
                padding: 0;
                margin: 0;
                width: 100%;
                height: 100%;
                overflow: hidden;
            }
    
            .leaflet-magnifying-glass {
                border-radius: 50%;
                border: 1px solid gray;
                box-shadow: 0 0 5px gray;
                position: absolute;
                overflow: hidden;
                -moz-box-sizing: border-box;
                box-sizing: border-box;
            }
    
            .leaflet-magnifying-glass>.leaflet-container {
                height: 100%;
                width: 100%;
            }
    
            /* Webkit-only workaround for the border-radius clipping bug,
    applied to the map container */
            .leaflet-magnifying-glass-webkit {
                border-radius: 50%;
                -webkit-mask-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAA5JREFUeNpiYGBgAAgwAAAEAAGbA+oJAAAAAElFTkSuQmCC);
            }
        </style>
    </head>
    
    <body>
        <div id="map"></div>
        <script type="text/javascript" src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"></script>
        <script type="text/javascript" src="./js/leaflet.magnifyingglass.js"></script>
        <script type="text/javascript">
            var map = L.map('map').setView([36.09, 120.35], 13);
            var tileUrl = "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png";
            L.tileLayer(tileUrl, {
                attribution: ''
            }).addTo(map);
    
            var magnifyingGlass = L.magnifyingGlass({
                zoomOffset: 3,
                layers: [
                    L.tileLayer(tileUrl)
                ]
            });
    
            map.addLayer(magnifyingGlass);
    
            // make the glass disappear on click...
            magnifyingGlass.on('click', function () {
                map.removeLayer(magnifyingGlass);
            })
    
            // ...and reappear on right click
            map.on('contextmenu', function (mouseEvt) {
                if (map.hasLayer(magnifyingGlass)) {
                    return;
                }
                map.addLayer(magnifyingGlass);
                magnifyingGlass.setLatLng(mouseEvt.latlng);
            });
        </script>
    </body>
    
    </html>

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_122290880]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/122290880
[dc113814b75442d589e5b588de498bcb.gif]: https://img-blog.csdnimg.cn/dc113814b75442d589e5b588de498bcb.gif
[BADAO_LIUMANG_QIZHI_CSDN_-C_SpringBoot]: https://blog.csdn.net/badao_liumang_qizhi
[GitHub - bbecquet_Leaflet.MagnifyingGlass_ A plugin to add a customizable magnifying glass tool to a Leaflet map.]: https://github.com/bbecquet/Leaflet.MagnifyingGlass