准备工作
- 注册开发者
- 创建应用
- 拿到百度地图ak
前端实现方案
引入百度地图API和工具类库
<script type="text/javascript" src="http://api.map.baidu.com/api?v=1.2&ak=您的密钥"></script> <script type="text/javascript" src="http://api.map.baidu.com/library/GeoUtils/1.2/src/GeoUtils_min.js"></script>
显示地图的HTML
<body> <div style="float:left;600px;height:500px;border:1px solid gray" id="container"></div> <div style="float:left;300px;height:500px;border:1px solid gray" id="control"> <table style="100%;"> <tr> <td colspan="2">判断是否在区域内:</td> </tr> <tr> <td><input type="button" value="点击打开范围" onclick="polygon()" /></td> </tr> <tr> <td>经度<input type="text" value="" id="lng"></td> </tr> <tr> <td>纬度<input type="text" value="" id="lat"></td> </tr> <tr> <td>结果：</td> </tr> <tr> <td><p id="result" style="color:red"></p></td> </tr> </table> </div> </body>
生成多边形以及判断点击的点是否在范围内的JS
<script type="text/javascript">
var map = new BMap.Map("container");
var pt = new BMap.Point(116.404, 39.915);
var mkr = new BMap.Marker(pt);
var ply; //多边形
map.centerAndZoom(pt, 16);
map.enableScrollWheelZoom(); //开启滚动缩放
map.enableContinuousZoom(); //开启缩放平滑
//初始化范围多边形
polygon1();
//生成多边形
function polygon() {
var pts = [];
var pt1 = new BMap.Point(116.475, 40.017);
var pt2 = new BMap.Point(116.355, 40.025);
var pt3 = new BMap.Point(116.220, 39.994);
var pt4 = new BMap.Point(116.208, 39.888);
var pt5 = new BMap.Point(116.279, 39.780);
var pt6 = new BMap.Point(116.398, 39.759);
var pt7 = new BMap.Point(116.558, 39.846);
var pt8 = new BMap.Point(116.549, 39.939);
pts.push(pt1);
pts.push(pt2);
pts.push(pt3);
pts.push(pt4);
pts.push(pt5);
pts.push(pt6);
pts.push(pt7);
pts.push(pt8);
ply = new BMap.Polygon(pts);
//演示：将面添加到地图上
map.clearOverlays();
map.addOverlay(ply);
}
map.addEventListener("click", function (e) {
mkr.setPosition(e.point);
map.addOverlay(mkr);
//将点击的点的坐标显示在页面上
document.getElementById("lng").value = e.point.lng;
document.getElementById("lat").value = e.point.lat;
InOrOutPolygon(e.point.lng, e.point.lat);
});
function InOrOutPolygon(lng, lat){
var pt = new BMap.Point(lng, lat);
var result = BMapLib.GeoUtils.isPointInPolygon(pt, ply);
if (result == true) {
document.getElementById("result").innerHTML = "在区域范围内";
} else {
document.getElementById("result").innerHTML = "在区域范围外";
}
}
</script>