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添加椭圆源代码展示

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<!DOCTYPE html>
<html>
<head>
    <meta charset='UTF-8' />
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <!--
        以下CSS地址请在安装软件了替换成本地的地址
        CSS地址请使用:
        http://localhost:9000/bigemap.js/v2.1.0/bigemap.css
        软件下载地址 http://www.bigemap.com/reader/download/detail201802017.html
    -->
    <link href='http://www.bigemap.com:9000/bigemap.js/v2.1.0/bigemap.css' rel='stylesheet' />
    <!--
        JS地址请使用：
        http://localhost:9000/bigemap.js/v2.1.0/bigemap.js
    -->
    <script src='http://www.bigemap.com:9000/bigemap.js/v2.1.0/bigemap.js'></script>
    <script src="http://www.bigemap.com/Public/common/js/jquery.min.js"></script>
<!--   插件下载地址  http://www.bigemap.com/Public/offline/oval/bm.ellipse.js.zip-->
    <script type="text/javascript" src="http://www.bigemap.com/Public/offline/oval/bm.ellipse.js"></script>
    <style>
        *{padding:0;margin:0}
        #map { width: 100vw;height: 100vh}
    </style>
    <title>Baidu Map</title>
</head>
<body>
<div id='map'></div>
<script>
    // 软件配置信息地址，软件安装完成之后使用本地地址，如：http://localhost:9000
    BM.Config.HTTP_URL = 'http://www.bigemap.com:9000';
    // 在ID为map的元素中实例化一个地图，并设置地图的ID号为 bigemap.baidu-map，ID号程序自动生成，无需手动配置，并设置地图的投影为百度地图 ，中心点，默认的级别和显示级别控件
    var map = BM.map('map', 'bigemap.zhongkexingtu', {center: [30, 100], zoom: 9, zoomControl: true });
    //中心点，长半径 短半径 ，旋转角度，颜色
    // BM.ellipse([lat,lng], [maxRadius,minRadius], rotate,{color:'red'});
    BM.ellipse( map.getCenter(), [50000,20000], 0,{color:'red'}).addTo(map);
    BM.ellipse( map.getCenter(), [50000,20000], 90,{color:'red'}).addTo(map);
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