三角拆分

使用 AMap.GeometryUtil.triangulateShape 方法，对几何图形进行三角拆分。

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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>三角拆分</title>
    <link rel="stylesheet" href="https://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css"/>
    <style>
        html,
        body,
        #container {
            width: 100%;
            height: 100%;
        }

        .info span {
            color: #0288d1;
        }

    </style>
</head>
<body>
<div id="container"></div>
<script src="https://cache.amap.com/lbs/static/es5.min.js"></script>
<script src="https://webapi.amap.com/maps?v=1.4.15&key=您申请的key值"></script>
<script>
    //初始化地图对象，加载地图
    var map = new AMap.Map("container", {
        resizeEnable: true,
        zoom: 10
    });
    // 带洞多边形 - 外多边形坐标数组和内多边形坐标数组
    var pointers = {
        outer: [
            [117.104554, 30.504444],
            [117.118974, 30.506219],
            [117.12893, 30.508586],
            [117.13305, 30.511248],
            [117.139917, 30.514501],
            [117.147126, 30.518642],
            [117.153993, 30.5216],
            [117.161546, 30.526036],
            [117.171502, 30.529289],
            [117.177339, 30.531655],
            [117.184892, 30.531063],
            [117.197595, 30.533133],
            [117.212014, 30.535499],
            [117.223001, 30.536682],
            [117.233987, 30.536977],
            [117.23845, 30.538456],
            [117.240854, 30.545848],
            [117.251153, 30.543778],
            [117.251497, 30.53816],
            [117.24875, 30.530767],
            [117.246347, 30.523965],
            [117.243943, 30.515684],
            [117.241197, 30.504149],
            [117.238107, 30.493795],
            [117.229524, 30.481073],
            [117.221971, 30.474268],
            [117.215104, 30.469533],
            [117.204461, 30.466574],
            [117.190728, 30.462727],
            [117.183862, 30.464207],
            [117.156739, 30.47456],
            [117.14644, 30.47841],
            [117.140603, 30.482257],
            [117.127214, 30.485215],
            [117.107988, 30.487878]
        ],
        inner: [
            [117.162061, 30.49361],
            [117.167211, 30.49716],
            [117.172361, 30.50071],
            [117.177167, 30.505739],
            [117.184034, 30.512542],
            [117.18987, 30.522894],
            [117.2012, 30.525851],
            [117.210126, 30.527034],
            [117.219396, 30.526443],
            [117.225919, 30.527034],
            [117.234159, 30.529104],
            [117.237935, 30.528808],
            [117.235532, 30.522894],
            [117.234502, 30.516683],
            [117.232785, 30.507514],
            [117.226262, 30.491835],
            [117.217336, 30.480297],
            [117.202916, 30.4729],
            [117.194677, 30.470828],
            [117.184034, 30.473491],
            [117.177511, 30.47793],
            [117.170644, 30.484439],
            [117.167897, 30.489173]
        ]
    };
    var pathArray = [
        pointers.outer,
        pointers.inner
    ];
    var polygon = new AMap.Polygon({
        map: map,
        fillOpacity:0.4,
        path: pathArray,
        fillColor: '#D1B3E3'
    });

    var pathArrayNormal = [
        [117.114879,30.532808],
        [117.1305,30.552693],
        [117.104408,30.558754],
        [117.075225,30.524158]
    ]
    var polygonNormal = new AMap.Polygon({
        map: map,
        fillOpacity:0.4,
        path: pathArrayNormal,
        fillColor: '#D1B3E3'
    });
    map.setFitView();
    // 获取随机颜色
    var getRandomColor = function(){
      return '#'+Math.floor(Math.random()*16777215).toString(16);
    }
    // 根据polygon顶点拆分三角形
    function triangulateShape(){
        // 获得三角形顶点集合
        var triangles = AMap.GeometryUtil.triangulateShape(pathArray[0],[pathArray[1]]);
        var trianglePathArr = pathArray[0].concat(pathArray[1]);
        for ( var i = 0; i < triangles.length; i += 3 ){
            var trianglePath = [trianglePathArr[triangles[i]],trianglePathArr[triangles[i+1]],trianglePathArr[triangles[i+2]]]
            var polygon_0 = new AMap.Polygon({
                map: map,
                fillOpacity:0.3,
                path: trianglePath,
                strokeOpacity: 0,
                fillColor: getRandomColor()
            });
        }
        
    }
    function triangulateShapeNormal(){
        // 获得三角形顶点集合
        var triangles = AMap.GeometryUtil.triangulateShape(pathArrayNormal);
        for ( var i = 0; i < triangles.length; i += 3 ){
            var trianglePath = [pathArrayNormal[triangles[i]],pathArrayNormal[triangles[i+1]],pathArrayNormal[triangles[i+2]]]
            var polygon_0 = new AMap.Polygon({
                map: map,
                fillOpacity:0.3,
                path: trianglePath,
                strokeOpacity: 0,
                fillColor: getRandomColor()
            });
        }
        
    }
    
    triangulateShape();
    triangulateShapeNormal();
    //绑定按钮事件
    // document.querySelector("#triangulateShape").onclick = function() {
    //   triangulateShape();
    // }
    // document.querySelector("#triangulateShapeNormal").onclick = function() {
    //   triangulateShapeNormal();
    // }
    
    
</script>
</body>
</html>
        
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