面与面的几何关系

GeometryUtil提供了面和面几何关系的计算方法，包括包含关系、相交关系以及重叠面的计算等，ringRingClip仅适用于凸多边形。

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          <!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>面与面的关系</title>
    <link rel="stylesheet" href="http://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css" type="text/css">
    <script type="text/javascript" src="http://webapi.amap.com/maps?v=2.0&key=您申请的key值"></script>
    <script type="text/javascript" src="http://cache.amap.com/lbs/static/addToolbar.js"></script>
    <style>
      html,body,#container{
        height: 100%
      }
    </style>
</head>
<body>
<div id="container"></div>
<div class='info'>拖动小多边形可调整位置</div>
<script type="text/javascript">
    //初始化地图对象，加载地图
    var map = new AMap.Map("container", {
        resizeEnable: true,
        zoom: 13
    });
    var path1 = [
        [116.376907,39.910967],
        [116.384911,39.919505],
        [116.40109,39.919728],
        [116.411132,39.911408],
        [116.412076,39.899135],
        [116.402292,39.892353],
        [116.3874,39.892518],
        [116.376971,39.899267]
    ]
    var polygon1 = new AMap.Polygon({
        map:map,
        fillColor:'blue',
        fillOpacity:0.3,
        path:path1,
    })
    var path2 = [
        [116.390233,39.906602],
        [116.395254,39.908668],
        [116.400661,39.906667],
        [116.400962,39.898589],
        [116.395769,39.894855],
        [116.390147,39.898049],
    ]
    var polygon2 = new AMap.Polygon({
        map:map,
        fillColor:'red',
        fillOpacity:0.3,
        path:path2,
        draggable: true
    })
    
    var textBox = new AMap.Text({
        map: map,
        position: new AMap.LngLat(116.40109,39.919728),
        offset: new AMap.Pixel(-20, -40),
        style:{
            'background-color':'yellow',
            'border':'solid 1px #0088ff',
            'padding':'10px 20px'
        }
    })

    
    function compute(){
        var polygon1_path = polygon1.getPath();
        var polygon2_path = polygon2.getPath();
        // 小圈是否在大圈内
        var isRingInRing = AMap.GeometryUtil.isRingInRing(polygon2_path,polygon1_path);
        // 两圈是否交叉
        var doesRingRingIntersect = AMap.GeometryUtil.doesRingRingIntersect(polygon2_path,polygon1_path);
        var ringRingClip = AMap.GeometryUtil.ringRingClip(polygon2_path,polygon1_path);
        var ringArea = parseInt(AMap.GeometryUtil.ringArea(ringRingClip))
        
        var text = '两圈关系：在大圈外';
        if(isRingInRing){
            text = '两圈关系：在大圈内';
        }else if(doesRingRingIntersect){
            text = '两圈关系：两圈相交, 交叉区域面积为'+ringArea+'平方米';
        }
        textBox.setText(text)


    }
    compute();
    polygon2.on('dragend',compute)


    map.setFitView();
</script>
</body>
</html>
        

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