Leaflet中绘制同心圆、多个中心对称多边形、平行四边形网格、矩形网格

左手的ㄟ右手 2023-09-30 12:53 10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]

在上面加载地图显示的基础上，除了绘制基本图形还可以绘制其他图形。

注：

博客：  
[https://blog.csdn.net/badao\_liumang\_qizhi][https_blog.csdn.net_badao_liumang_qizhi]  
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## 实现 ##

1、绘制同心圆

//绘制同心圆
            //设置圆心坐标
            var latLng = L.latLng(36.09, 120.35);
            //初始半径
            var r = 65;
            for (var i = 0; i < 5; i++) {
                //添加圆
                L.circle(latLng, {
                    //圆半径
                    radius: r,
                    //颜色
                    color: '#ffcc33',
                    //填充色
                    fillColor: 'white',
                    //填充色透明度
                    fillOpacity: 0.8
                }).addTo(map);
                //调整半径大小
                r = r / 1.5;
            }

2、绘制多个中心对称多边形

//绘制多个中心对称多边形
            for (var i = 0; i < 8; i++) {
                    //设置矩形的坐标范围
                    var bounds = [[36.15 + i * 0.000125, 120.35 + i * 0.000125], [36.11 - i * 0.000125, 120.30 - i * 0.000125]];
                    //将创建的矩形添加进图层
                    L.rectangle(bounds, {
                        //边线颜色
                        color: "#ff7800",
                        //线宽
                        weight: 3,
                        //填充色
                        fillColor: 'white',
                        //透明度
                        fillOpacity: 0
                    }).addTo(map);
            }

3、绘制平行四边形网格

//绘制平行四边形网格
            //绘制经线，倾斜
            for (var i = 0; i < 9; i++) {
                L.polyline([[36.13, 120.33 + i * 0.00375], [36.16, 120.33 + (i + 1) * 0.00375]], { color: 'red' }).addTo(map);
            }
    
            //绘制纬线,水平
            for (var j = 0; j < 9; j++) {
                L.polyline([[36.13 + j *0.00375, 120.33 + j * 0.00375 / 8], [36.13 + j * 0.00375, 120.36 + j * 0.00375 / 8]], { color: 'red' }).addTo(map);
            }

注意这里的经纬度的差值除以8为递增的等距离

4、绘制矩形网格

//绘制矩形网格
            //绘制经线
            for (var i = 0; i < 11; i++) {
                L.polyline([[36.18, 120.36 + i * 0.001], [36.19, 120.36 + i * 0.001]], { color: 'red' }).addTo(map);
            }
            //绘制纬线
            for (var j = 0; j < 11; j++) {
                L.polyline([[36.18 + j * 0.001, 120.36], [36.18 + j * 0.001, 120.37]], { color: 'red' }).addTo(map);
            }

注意这里也是经纬度的差值除以10为递增的等距离

5、完整示例代码

<!doctype html>
    <html lang="en">
    
    <head>
        <meta charset="UTF-8">
        <title>leaflet绘制同心圆</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;
            }
        </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">
            var map = L.map('map').setView([36.09, 120.35], 13);
            L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
                attribution: ''
            }).addTo(map);
    
            //绘制同心圆
            //设置圆心坐标
            var latLng = L.latLng(36.09, 120.35);
            //初始半径
            var r = 65;
            for (var i = 0; i < 5; i++) {
                //添加圆
                L.circle(latLng, {
                    //圆半径
                    radius: r,
                    //颜色
                    color: '#ffcc33',
                    //填充色
                    fillColor: 'white',
                    //填充色透明度
                    fillOpacity: 0.8
                }).addTo(map);
                //调整半径大小
                r = r / 1.5;
            }
    
            //绘制多个中心对称多边形
            for (var i = 0; i < 8; i++) {
                    //设置矩形的坐标范围
                    var bounds = [[36.15 + i * 0.000125, 120.35 + i * 0.000125], [36.11 - i * 0.000125, 120.30 - i * 0.000125]];
                    //将创建的矩形添加进图层
                    L.rectangle(bounds, {
                        //边线颜色
                        color: "#ff7800",
                        //线宽
                        weight: 3,
                        //填充色
                        fillColor: 'white',
                        //透明度
                        fillOpacity: 0
                    }).addTo(map);
            }
    
            //绘制平行四边形网格
            //绘制经线，倾斜
            for (var i = 0; i < 9; i++) {
                L.polyline([[36.13, 120.33 + i * 0.00375], [36.16, 120.33 + (i + 1) * 0.00375]], { color: 'red' }).addTo(map);
            }
    
            //绘制纬线,水平
            for (var j = 0; j < 9; j++) {
                L.polyline([[36.13 + j *0.00375, 120.33 + j * 0.00375 / 8], [36.13 + j * 0.00375, 120.36 + j * 0.00375 / 8]], { color: 'red' }).addTo(map);
            }
    
            //绘制矩形网格
            //绘制经线
            for (var i = 0; i < 11; i++) {
                L.polyline([[36.18, 120.36 + i * 0.001], [36.19, 120.36 + i * 0.001]], { color: 'red' }).addTo(map);
            }
            //绘制纬线
            for (var j = 0; j < 11; j++) {
                L.polyline([[36.18 + j * 0.001, 120.36], [36.18 + j * 0.001, 120.37]], { color: 'red' }).addTo(map);
            }
    
        </script>
    </body>
    
    </html>

6、效果

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo_size_20_color_FFFFFF_t_70_g_se_x_16][]![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo_size_19_color_FFFFFF_t_70_g_se_x_16][]![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_122290880]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/122290880
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo_size_20_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/f8c54baf41344247ac70efe73860a930.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo_size_19_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/1af4cb0d90e0438cb0b70c36ed9ba1bc.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA6Zy46YGT5rWB5rCT5rCU6LSo,size_19,color_FFFFFF,t_70,g_se,x_16
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