<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>GeoUtils示例</title>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=1.2"></script>
<script type="text/javascript" src="http://api.map.baidu.com/library/GeoUtils/1.2/src/GeoUtils_min.js"></script>
<style type="text/css">
table {
font-size: 14px;
}
</style>
</head>
<body>
<div style="float:left;width:600px;height:500px;border:1px solid gray" id="container"></div>
<div style="float:left;width:300px;height:500px;border:1px solid gray" id="control">
<table style="width:100%;">
<tr>
<td colspan="2">判断点是否在多边形内:</td>
</tr>
<tr>
<td><input type="button" value="多边形1" onclick="polygon1()" /></td>
</tr>
<tr>
<td><input type="button" value="多边形2" onclick="polygon2()" /></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>
</html>
<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
//初始化为多边形1
polygon1();
//生成多边形1
function polygon1() {
var pts = [];
var pt1 = new BMap.Point(116.395, 39.910);
var pt2 = new BMap.Point(116.394, 39.914);
var pt3 = new BMap.Point(116.403, 39.920);
var pt4 = new BMap.Point(116.402, 39.914);
var pt5 = new BMap.Point(116.410, 39.913);
pts.push(pt1);
pts.push(pt2);
pts.push(pt3);
pts.push(pt4);
pts.push(pt5);
ply = new BMap.Polygon(pts);
//演示：将面添加到地图上
map.clearOverlays();
map.addOverlay(ply);
}
//生成多边形2
function polygon2() {
var pts = [];
var pt1 = new BMap.Point(116.395, 39.910);
var pt2 = new BMap.Point(116.394, 39.914);
var pt3 = new BMap.Point(116.396, 39.919);
var pt4 = new BMap.Point(116.406, 39.920);
var pt5 = new BMap.Point(116.410, 39.913);
pts.push(pt1);
pts.push(pt2);
pts.push(pt3);
pts.push(pt4);
pts.push(pt5);
ply = new BMap.Polygon(pts);
//演示：将多边形添加到地图上
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 = "点在多边形内";
} else {
document.getElementById("result").innerHTML = "点在多边形外";
}
}
</script> 原文
http://www.jb51.net/article/78772.htm
http://www.w2bc.com/article/96304