使用高德地图绘制多边形区域——电子围栏练习

第一次用到高德地图，需要实现一个电子围栏的功能：画一个区域，统计区域内目标个数，对进出区域的目标报警。本文就第一个功能画一个区域进行了实现，是为了后续使用，目标是否在区域内，以及是都在区域边界（阈值设置）高德地图都有现成的API接口，所以不作探讨。

下面直接给出绘制区域的代码：

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>画电子围栏</title>
    <link rel="stylesheet" href="http://cache.amap.com/lbs/static/main1119.css"/>
    <script src="http://webapi.amap.com/maps?v=1.3&key=这里写上你的key&plugin=AMap.PolyEditor"></script>
    <script type="text/javascript" src="http://cache.amap.com/lbs/static/addToolbar.js"></script>
    <script src="http://lib.sinaapp.com/js/jquery/2.2.4/jquery-2.2.4.min.js" type="text/javascript" charset="utf-8"></script>
</head>
<body>
<div id="container"></div>
<div id="myPageTop">
    <table>        
        <tr>
            <td>添加新围栏:</td>
			<td><input type="button" value="开始" onClick="startDrawPolygon();"></td>
			<td><input type="button" value="完成" onClick="endDrawPolygon();"></td>  
        </tr>
    </table>
</div>
<script>
    var editorTool, map = new AMap.Map("container", {
        resizeEnable: true,
        center: [116.403322, 39.900255],//地图中心点
        zoom: 13 //地图显示的缩放级别
    });
    var beginNum = 0;
    var clickListener ;
    var beginPoints;
    var beginMarks ;
    var polygonEditor;
    var resPolygon = [];
    var resNum = 0;	
	var Polygon;
    init();
    function init(){
        beginPoints = [];
        beginMarks = [];
        beginNum = 0;
        polygonEditor = '';
        clickListener = AMap.event.addListener(map, "click", mapOnClick);

        var str = '[{"J":39.91789947393269,"G":116.36744477221691,"lng":116.367445,"lat":39.917899},{"J":39.91184292800211,"G":116.40658356616223,"lng":116.406584,"lat":39.911843},{"J":39.88616249265181,"G":116.37963272998047,"lng":116.379633,"lat":39.886162}]';
        var arr = json2arr(str);
        //createPolygon(arr);
    }
    
    function mapOnClick(e) {
        // document.getElementById("lnglat").value = e.lnglat.getLng() + ',' + e.lnglat.getLat()
        beginMarks.push(addMarker(e.lnglat));
        beginPoints.push(e.lnglat);
        beginNum++;
		//alert(beginNum);				
		if(beginNum >= 3)
		{	
			//AMap.event.removeListener(clickListener);  
			if(beginNum > 3)
			{
				//清除前一次的多边形
				map.remove(Polygon);
			}							
			Polygon = createPolygon(beginPoints);
			//polygonEditor = createEditor(polygon);
			clearMarks();			
		}
		
    };


    function createPolygon(arr){
        var polygon = new AMap.Polygon({
            map: map,
            path: arr,
            strokeColor: "#0000ff",
            strokeOpacity: 1,
            strokeWeight: 3,
            fillColor: "#f5deb3",
            fillOpacity: 0.35
        });
        return polygon;
    }

	function startDrawPolygon()
	{
		init();
	}
	
	function endDrawPolygon()
	{
		AMap.event.removeListener(clickListener);
		
	}
	
    function createEditor(polygon){
        var polygonEditor = new AMap.PolyEditor(map, polygon);
        polygonEditor.open();
        AMap.event.addListener(polygonEditor,'end',polygonEnd);
        return polygonEditor;
    }

    function closeEditPolygon(){
        polygonEditor.close();
    }

    function polygonEnd(res){
        resPolygon.push(res.target);
        alert(resPolygon[resNum].contains([116.386328, 39.913818]));
        appendHideHtml(resNum,res.target.getPath());
        
        resNum++;
        init();
    }

    function appendHideHtml(index,arr){
        var strify = JSON.stringify(arr);
        var html = '<input type="hidden" id="index'+index+'" name="paths[]" value="'+strify+'">';
        $('body').append(html);
        console.log(html);
    }

    

    function clearMarks(){
        map.remove(beginMarks);
    }

    function json2arr(json){
        var arr = JSON.parse(json);
        var res = [];
        for (var i = 0; i < arr.length; i++) {
            var line = [];
            line.push(arr[i].lng);
            line.push(arr[i].lat);
            res.push(line);
        };
        return res;
    }


     // 实例化点标记
    function addMarker(lnglat) {
        
        var marker = new AMap.Marker({
            icon: "http://webapi.amap.com/theme/v1.3/markers/n/mark_b.png",
            position: lnglat
        });
        marker.setMap(map);
        return marker;
    }

</script>
</body>
</html>

使用高德地图绘制多边形区域——电子围栏练习

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